技术领域technical field
本实用新型涉及显示技术领域，尤其涉及一种像素电路、显示面板和显示装置。The utility model relates to the field of display technology, in particular to a pixel circuit, a display panel and a display device.
背景技术Background technique
随着多媒体技术的急速进步，半导体元件及显示技术也随之具有飞跃性的进步。With the rapid progress of multimedia technology, semiconductor components and display technology also have leaps and bounds.
有机发光二极管（Organic Light Emitting Diode，OLED）显示器因具有功耗低、亮度高、成本低、视角广，以及响应速度快等优点，备受关注，在有机发光技术领域得到了广泛的应用。Organic Light Emitting Diode (OLED) displays have attracted much attention due to their advantages of low power consumption, high brightness, low cost, wide viewing angle, and fast response, and have been widely used in the field of organic light emitting technology.
在OLED显示装置中，显示面板的像素电路中用于驱动发光器件发光的驱动晶体管，由于在制作过程中存在结构上的不均匀性，以及电学性能和稳定性方面的不均匀性，导致晶体管的阈值电压（Vth）会产生漂移，使得流经发光器件的电流，会随着像素电路中的驱动晶体管的阈值电压的漂移而有所不同，进而会使得显示面板不同位置处的亮度有差异，导致显示面板的亮度均匀性较差，显示不均匀，降低了显示面板的亮度均匀性与亮度恒定性。In the OLED display device, the driving transistor used to drive the light-emitting device to emit light in the pixel circuit of the display panel, due to the structural inhomogeneity in the manufacturing process, as well as the inhomogeneity in electrical performance and stability, lead to the transistor's unevenness. The threshold voltage (Vth) will drift, so that the current flowing through the light-emitting device will vary with the drift of the threshold voltage of the drive transistor in the pixel circuit, which will cause differences in the brightness at different positions of the display panel, resulting in The brightness uniformity of the display panel is poor, and the display is uneven, which reduces the brightness uniformity and brightness constancy of the display panel.
实用新型内容Utility model content
本实用新型的目的是提供一种像素电路、显示面板和显示装置，以解决现有的像素电路导致显示面板亮度均匀性和亮度恒定性较差，显示不均匀的问题。The purpose of the utility model is to provide a pixel circuit, a display panel and a display device to solve the problem of poor brightness uniformity and brightness constancy of the display panel and uneven display caused by the existing pixel circuit.
本实用新型的目的是通过以下技术方案实现的：The purpose of this utility model is achieved by the following technical solutions:
第一方面，本实用新型提供一种像素电路，包括控制子电路、补偿子电路、驱动晶体管和发光器件，其中，In the first aspect, the present invention provides a pixel circuit, including a control subcircuit, a compensation subcircuit, a driving transistor and a light emitting device, wherein,
所述驱动晶体管的栅极连接所述补偿子电路，漏极连接可变电压源，源极连接所述发光器件；The gate of the drive transistor is connected to the compensation sub-circuit, the drain is connected to a variable voltage source, and the source is connected to the light emitting device;
所述控制子电路与所述补偿子电路相连，用于在扫描信号和充电信号的控制下，控制所述补偿子电路充放电；The control subcircuit is connected to the compensation subcircuit, and is used to control the charging and discharging of the compensation subcircuit under the control of the scanning signal and the charging signal;
所述控制子电路与所述驱动晶体管及所述发光器件相连，用于在发光控制信号控制下，控制所述驱动晶体管驱动所述发光器件发光；The control subcircuit is connected to the driving transistor and the light emitting device, and is used to control the driving transistor to drive the light emitting device to emit light under the control of a light emitting control signal;
所述补偿子电路在所述控制子电路的控制下完成电位复位，并用于存储所述驱动晶体管的阈值电压，以在所述驱动晶体管驱动所述发光器件发光时补偿所述驱动晶体管的阈值电压。The compensation subcircuit completes potential reset under the control of the control subcircuit, and is used to store the threshold voltage of the driving transistor, so as to compensate the threshold voltage of the driving transistor when the driving transistor drives the light emitting device to emit light .
本实用新型实施例提供的像素电路，补偿子电路在控制子电路的控制下，能够完成电位的复位，并存储驱动晶体管的阈值电压，能够较好的在驱动晶体管驱动发光器件发光时，补偿驱动晶体管的阈值电压，最终使得驱动发光器件发光的驱动电流与驱动晶体管的阈值电压没有关系，改善面板的显示均匀性。In the pixel circuit provided by the embodiment of the present invention, under the control of the control sub-circuit, the compensation sub-circuit can complete the potential reset and store the threshold voltage of the drive transistor, and can better compensate and drive the transistor when the drive transistor drives the light-emitting device to emit light. The threshold voltage of the transistor finally makes the driving current for driving the light-emitting device to emit light irrelevant to the threshold voltage of the driving transistor, thereby improving the display uniformity of the panel.
具体的，所述补偿子电路包括第一电容、第二电容和第一开关晶体管，其中，Specifically, the compensation sub-circuit includes a first capacitor, a second capacitor and a first switch transistor, wherein,
所述第一电容的第一端连接所述控制子电路以及所述第二电容的第二端，所述第一电容的第二端连接所述驱动晶体管的栅极以及所述第一开关晶体管的漏极；The first end of the first capacitor is connected to the control sub-circuit and the second end of the second capacitor, and the second end of the first capacitor is connected to the gate of the drive transistor and the first switch transistor the drain;
所述第二电容的第一端连接参考电压源，所述第二电容的第二端连接所述第一电容的第一端；The first end of the second capacitor is connected to a reference voltage source, and the second end of the second capacitor is connected to the first end of the first capacitor;
所述第一开关晶体管的栅极连接第一门信号源，漏极连接所述驱动晶体管的栅极和所述第一电容的第二端，源极连接所述驱动晶体管的源极；The gate of the first switching transistor is connected to a first gate signal source, the drain is connected to the gate of the driving transistor and the second end of the first capacitor, and the source is connected to the source of the driving transistor;
所述控制子电路控制所述第一电容和所述第二电容充放电，使所述第一电容和所述第二电容的连接端存储的电位进行复位，并控制所述第一开关晶体管导通，使第一电容在所述驱动晶体管以二极管连接方式下充放电，使所述第一电容存储所述驱动晶体管的阈值电压，在完成复位的同时完成驱动晶体管阈值电压的存储。The control subcircuit controls the charge and discharge of the first capacitor and the second capacitor, resets the potential stored at the connection end of the first capacitor and the second capacitor, and controls the first switch transistor to conduct turn on, the first capacitor is charged and discharged in the diode-connected mode of the driving transistor, the first capacitor is used to store the threshold voltage of the driving transistor, and the storage of the threshold voltage of the driving transistor is completed while the reset is completed.
具体的，所述控制子电路包括充电控制模块和发光控制模块，其中，Specifically, the control sub-circuit includes a charging control module and a lighting control module, wherein,
所述充电控制模块与所述第一电容的第一端、以及所述第二电容的第二端连接，用于在扫描信号和充电信号控制下，控制所述第一电容和所述第二电容充放电，使所述第一电容和所述第二电容的连接端存储的电位复位，并控制所述第一开关晶体管导通，使第一电容在所述驱动晶体管以二极管连接方式下充放电，使所述第一电容存储所述驱动晶体管的阈值电压；还用于接收驱动所述发光器件发光的数据电压信号，以控制所述第一电容和所述第二电容存储用于驱动发光器件发光的数据电压；The charging control module is connected to the first terminal of the first capacitor and the second terminal of the second capacitor, and is used to control the first capacitor and the second capacitor under the control of the scan signal and the charging signal. charging and discharging the capacitor, resetting the potential stored at the connection end of the first capacitor and the second capacitor, and controlling the conduction of the first switching transistor, so that the first capacitor is charged in the diode-connected manner of the driving transistor discharge, so that the first capacitor stores the threshold voltage of the driving transistor; it is also used to receive a data voltage signal for driving the light emitting device to emit light, so as to control the first capacitor and the second capacitor to store the voltage for driving the light emitting device The data voltage at which the device emits light;
所述发光控制模块与所述驱动晶体管的源极、以及所述发光器件连接，用于在发光控制信号控制下，使所述驱动晶体管驱动所述发光器件发光。The light emission control module is connected to the source of the driving transistor and the light emitting device, and is used to make the driving transistor drive the light emitting device to emit light under the control of the light emitting control signal.
具体的，所述充电控制模块包括第二开关晶体管，其中，Specifically, the charging control module includes a second switching transistor, wherein,
所述第二开关晶体管的漏极连接数据电压源，栅极连接第二门信号源，源极连接所述第一电容的第一端和所述第二电容的第二端。The drain of the second switch transistor is connected to the data voltage source, the gate is connected to the second gate signal source, and the source is connected to the first terminal of the first capacitor and the second terminal of the second capacitor.
具体的，所述发光控制模块包括第三开关晶体管，其中，Specifically, the lighting control module includes a third switching transistor, wherein,
所述第三开关晶体管的栅极连接第三门信号源，漏极连接所述驱动晶体管的源极，源极连接所述发光器件的阳极。The gate of the third switching transistor is connected to the third gate signal source, the drain is connected to the source of the driving transistor, and the source is connected to the anode of the light emitting device.
进一步的，该像素电路还包括：第四开关晶体管，其中，Further, the pixel circuit further includes: a fourth switch transistor, wherein,
所述第四开关晶体管的栅极与所述第一门信号源连接，漏极与所述第二电容的第二端、所述第一电容的第一端连接，源极与所述驱动晶体管的漏极连接。The gate of the fourth switching transistor is connected to the first gate signal source, the drain is connected to the second terminal of the second capacitor and the first terminal of the first capacitor, and the source is connected to the drive transistor drain connection.
具体的，所述第一开关晶体管、第二开关晶体管、第三开关晶体管和第四开关晶体管均为P型晶体管或均为N型晶体管，以简化制作工艺。Specifically, the first switch transistor, the second switch transistor, the third switch transistor and the fourth switch transistor are all P-type transistors or all are N-type transistors, so as to simplify the manufacturing process.
第二方面，提供一种显示面板，包括由栅线和数据线限定的呈矩阵排列的像素单元，每一所述像素单元中包括一个像素电路；In a second aspect, a display panel is provided, including pixel units arranged in a matrix defined by gate lines and data lines, and each of the pixel units includes a pixel circuit;
其中，所述像素电路为上述涉及的像素电路。Wherein, the pixel circuit is the pixel circuit mentioned above.
具体的，该显示面板还包括第一电源信号线、第二电源信号线和控制信号线，其中，Specifically, the display panel also includes a first power signal line, a second power signal line and a control signal line, wherein,
驱动晶体管的漏极通过所述第一电源信号线与可变电压源连接；The drain of the driving transistor is connected to a variable voltage source through the first power signal line;
第二电容的第一端通过所述第二电源信号线与参考电压源连接；The first end of the second capacitor is connected to the reference voltage source through the second power signal line;
第一开关晶体管的栅极通过控制信号线与第一门信号源连接；The gate of the first switch transistor is connected to the first gate signal source through the control signal line;
第二开关晶体管的栅极通过栅线与所述第二门信号源连接，漏极通过数据线与数据电压源连接；The gate of the second switching transistor is connected to the second gate signal source through a gate line, and the drain is connected to a data voltage source through a data line;
第三开关晶体管的栅极通过控制信号线与所述第三门信号源连接。The gate of the third switch transistor is connected to the third gate signal source through a control signal line.
本实用新型实施例提供的显示面板，像素电路能够完成电位的复位，并存储驱动晶体管的阈值电压，能够较好的在驱动晶体管驱动发光器件发光时，补偿驱动晶体管的阈值电压，最终使得驱动发光器件发光的驱动电流与驱动晶体管的阈值电压没有关系，改善面板的显示均匀性。In the display panel provided by the embodiment of the present invention, the pixel circuit can complete the potential reset and store the threshold voltage of the driving transistor, and can better compensate the threshold voltage of the driving transistor when the driving transistor drives the light-emitting device to emit light, and finally make the driving transistor emit light The driving current of the device to emit light has no relationship with the threshold voltage of the driving transistor, which improves the display uniformity of the panel.
第三方面，还提供一种显示装置，该显示装置包括上述涉及的显示面板。In a third aspect, a display device is further provided, and the display device includes the display panel mentioned above.
本实用新型实施例提供的显示装置，显示面板的像素电路能够完成电位的复位，并存储驱动晶体管的阈值电压，能够较好的在驱动晶体管驱动发光器件发光时，补偿驱动晶体管的阈值电压，最终使得驱动发光器件发光的驱动电流与驱动晶体管的阈值电压没有关系，改善面板的显示均匀性。In the display device provided by the embodiment of the present invention, the pixel circuit of the display panel can reset the potential and store the threshold voltage of the driving transistor, and can better compensate the threshold voltage of the driving transistor when the driving transistor drives the light-emitting device to emit light, and finally The driving current for driving the light-emitting device to emit light has no relationship with the threshold voltage of the driving transistor, thereby improving the display uniformity of the panel.
附图说明Description of drawings
图1为本实用新型实施例提供的像素电路第一结构示意图；FIG. 1 is a schematic diagram of a first structure of a pixel circuit provided by an embodiment of the present invention;
图2为本实用新型实施例提供的像素电路第二结构示意图；Fig. 2 is a schematic diagram of the second structure of the pixel circuit provided by the embodiment of the present invention;
图3为本实用新型实施例提供的像素电路第三结构示意图；Fig. 3 is a schematic diagram of the third structure of the pixel circuit provided by the embodiment of the present invention;
图4为本实用新型实施例提供的像素电路第四结构示意图；FIG. 4 is a schematic diagram of a fourth structure of a pixel circuit provided by an embodiment of the present invention;
图5为本实用新型实施例提供的像素电路第五结构示意图；FIG. 5 is a schematic diagram of a fifth structure of a pixel circuit provided by an embodiment of the present invention;
图6为本实用新型实施例提供的像素电路驱动时序图；FIG. 6 is a timing diagram for driving a pixel circuit provided by an embodiment of the present invention;
图7A-图7C为本实用新型实施例提供的像素电路不同阶段的等效电路图；7A-7C are equivalent circuit diagrams of different stages of the pixel circuit provided by the embodiment of the present invention;
图8为本实用新型实施例提供的像素电路的第六结构示意图；FIG. 8 is a schematic diagram of the sixth structure of the pixel circuit provided by the embodiment of the present invention;
图9为本实用新型实施例提供的又一像素电路驱动时序图；Fig. 9 is another pixel circuit driving timing diagram provided by the embodiment of the present invention;
图10为本实用新型实施例提供的显示面板构成示意图。FIG. 10 is a schematic diagram of the structure of the display panel provided by the embodiment of the present invention.
具体实施方式Detailed ways
下面将结合本实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本实用新型一部分实施例，并不是全部的实施例。基于本实用新型中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本实用新型保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.
本实用新型实施例提供的像素电路，可用于驱动显示装置中每一个像素实现图像显示。The pixel circuit provided by the embodiment of the present invention can be used to drive each pixel in the display device to realize image display.
需要说明的是，本实用新型实施例中采用的开关晶体管和驱动晶体管可以为薄膜晶体管或场效应管或其他特性相同的器件，由于这里采用的晶体管的源极、漏极是对称的，所以其源极、漏极是可以互换的。在本实用新型实施例中，为区分晶体管除栅极之外的两极，将其中一极称为源极，另一极称为漏极。It should be noted that the switching transistors and driving transistors used in the embodiment of the utility model can be thin film transistors or field effect transistors or other devices with the same characteristics. Since the source and drain of the transistors used here are symmetrical, their Source and drain are interchangeable. In the embodiment of the present invention, in order to distinguish the two poles of the transistor except the gate, one pole is called the source, and the other pole is called the drain.
进一步需要说明的是，本实用新型实施例中涉及到的元件A与元件B“连接”的描述，可能表示A与B直接连接，也可能表示A与B之间通过介于A和B之间的元件间接连接（例如A通过元件C连接B）。相比之下，当元件A称为“直接连接”B时，则表示没有介于A和B其间的元件存在。It should be further noted that the description of the "connection" between component A and component B involved in the embodiment of the present utility model may mean that A and B are directly connected, or that A and B are connected through a connection between A and B. Components are indirectly connected (for example, A is connected to B through component C). In contrast, when an element A is referred to as being "directly connected" to B, it means that there are no intervening elements between A and B.
本实用新型实施例一提供一种像素电路，图1所示为本实用新型实施例提供的像素电路构成示意图，如图1所示，本实用新型实施例提供的像素电路包括控制子电路1、补偿子电路2、驱动晶体管T1和发光器件3。Embodiment 1 of the present utility model provides a pixel circuit. FIG. 1 is a schematic diagram of the composition of the pixel circuit provided by the embodiment of the present utility model. As shown in FIG. 1 , the pixel circuit provided by the embodiment of the present utility model includes a control sub-circuit 1, Compensation sub-circuit 2 , driving transistor T1 and light emitting device 3 .
具体的，驱动晶体管T1的栅极连接补偿子电路2，漏极连接可变电压源，源极连接发光器件3。Specifically, the gate of the driving transistor T1 is connected to the compensation sub-circuit 2 , the drain is connected to the variable voltage source, and the source is connected to the light emitting device 3 .
本实用新型实施例中控制子电路1与补偿子电路2连接，用于在扫描信号和充电信号控制下，控制补偿子电路2进行充放电。In the embodiment of the utility model, the control sub-circuit 1 is connected with the compensation sub-circuit 2, and is used to control the compensation sub-circuit 2 to charge and discharge under the control of the scanning signal and the charging signal.
进一步的，本实用新型实施例中控制子电路1与驱动晶体管T1和发光器件3相连，用于在发光控制信号控制下，控制驱动晶体管T1驱动发光器件3发光。Further, in the embodiment of the present utility model, the control sub-circuit 1 is connected with the driving transistor T1 and the light emitting device 3 for controlling the driving transistor T1 to drive the light emitting device 3 to emit light under the control of the light emitting control signal.
补偿子电路2，在控制子电路1的控制下完成电位复位，并用于存储驱动晶体管T1的阈值电压，以在驱动晶体管T1驱动发光器件3发光时补偿驱动晶体管T1的阈值电压。The compensation sub-circuit 2 completes potential reset under the control of the control sub-circuit 1 and is used for storing the threshold voltage of the driving transistor T1 to compensate the threshold voltage of the driving transistor T1 when the driving transistor T1 drives the light-emitting device 3 to emit light.
进一步的，本实用新型实施例中的发光器件3例如可以是OLED等有机发光显示器件，驱动晶体管T1可以是N型晶体管，也可以是P型晶体管，本实用新型实施例中图1中以发光器件为OLED、驱动晶体管为N型晶体管为例进行说明。Further, the light-emitting device 3 in the embodiment of the present utility model can be, for example, an organic light-emitting display device such as an OLED, and the driving transistor T1 can be an N-type transistor or a P-type transistor. The device is an OLED, and the driving transistor is an N-type transistor as an example for illustration.
较佳的，本实用新型实施例中补偿子电路2可以包括第一电容C1、第二电容C2和第一开关晶体管T2。第一电容C1的第一端连接控制子电路1以及第二电容C2的第二端，第一电容C1的第二端连接驱动晶体管T1的栅极以及第一开关晶体管T2的漏极。第二电容C2的第一端连接参考电压源，第二电容C2的第二端连接第一电容的第一端。第一开关晶体管T2的栅极连接第一门信号源S1，漏极连接驱动晶体管T1的栅极和第一电容C1的第二端，源极连接驱动晶体管T1的漏极。Preferably, the compensation sub-circuit 2 in the embodiment of the present invention may include a first capacitor C1, a second capacitor C2 and a first switching transistor T2. The first end of the first capacitor C1 is connected to the control sub-circuit 1 and the second end of the second capacitor C2, and the second end of the first capacitor C1 is connected to the gate of the driving transistor T1 and the drain of the first switching transistor T2. The first end of the second capacitor C2 is connected to the reference voltage source, and the second end of the second capacitor C2 is connected to the first end of the first capacitor. The gate of the first switching transistor T2 is connected to the first gate signal source S1, the drain is connected to the gate of the driving transistor T1 and the second terminal of the first capacitor C1, and the source is connected to the drain of the driving transistor T1.
图2所示为本实用新型实施例提供的像素电路的又一构成示意图，如图2所示，本实用新型实施例中驱动晶体管T1的栅极、第一开关晶体管T2的漏极以及第一电容C1的第二端连接于节点a。驱动晶体管T1的源极与第一开关晶体管T2的源极连接于节点c。第二电容C2的第二端与第一电容C1的第一端连接于节点b。第二电容C2的第一端连接参考电压源，参考电压源输出参考复位电压，使第二电容的第一端的电位为参考复位电压的电位。控制子电路1在扫描信号和充电信号的控制下控制第一电容C1和第二电容C2充放电，使第一电容C1和第二电容C2的连接端的电位重置为参考复位电压的电位，将参考复位电压存储在节点b。第一门信号源S1输出控制第一开关晶体管T2导通或截止的电平信号，第一开关晶体管T2导通，使第一电容在驱动晶体管T1以二极管连接的方式下放电，使驱动晶体管T1自动截止，并在第一电容C1的第二端即节点a，存储驱动晶体管T1自动截止的阈值电压，即完成电位的复位以及驱动晶体管T1阈值电压的存储。Fig. 2 is another schematic diagram of the composition of the pixel circuit provided by the embodiment of the present utility model. As shown in Fig. 2 , the gate of the driving transistor T1, the drain of the first switching transistor T2 and the first The second terminal of the capacitor C1 is connected to the node a. The source of the driving transistor T1 and the source of the first switching transistor T2 are connected to the node c. The second terminal of the second capacitor C2 and the first terminal of the first capacitor C1 are connected to the node b. The first end of the second capacitor C2 is connected to a reference voltage source, and the reference voltage source outputs a reference reset voltage, so that the potential of the first end of the second capacitor is the potential of the reference reset voltage. The control sub-circuit 1 controls the charge and discharge of the first capacitor C1 and the second capacitor C2 under the control of the scanning signal and the charging signal, so that the potential of the connection terminal of the first capacitor C1 and the second capacitor C2 is reset to the potential of the reference reset voltage, and the A reference reset voltage is stored at node b. The first gate signal source S1 outputs a level signal that controls the turn-on or turn-off of the first switch transistor T2, and the first switch transistor T2 is turned on, so that the first capacitor is discharged in the diode-connected manner of the drive transistor T1, so that the drive transistor T1 Automatically cut off, and store the threshold voltage at which the driving transistor T1 is automatically cut off at the second end of the first capacitor C1, that is, the node a, that is, reset the potential and store the threshold voltage of the driving transistor T1.
较佳的，本实用新型实施例中控制子电路1包括充电控制模块11和发光控制模块12，如图3所示，为本实用新型实施例提供的像素电路的再一构成示意图。Preferably, the control sub-circuit 1 in the embodiment of the present invention includes a charging control module 11 and a lighting control module 12, as shown in FIG. 3 , which is another schematic diagram of the structure of the pixel circuit provided by the embodiment of the present invention.
充电控制模块11与第一电容C1的第一端、第二电容C2的第二端连接，用于在扫描信号和充电信号的控制下，控制第一电容C1和第二电容C2充放电，实现电位复位以及阈值电压的存储。本实用新型实施例中充电控制模块11还用于接收驱动发光器件OLED发光的数据电压信号，以控制第一电容C1和第二电容C2存储用于驱动发光器件OLED发光的数据电压。发光控制模块12与驱动晶体管T1的源极以及发光器件OLED连接，用于在发光控制信号控制下，使驱动晶体管T1驱动发光器件OLED发光。The charging control module 11 is connected to the first terminal of the first capacitor C1 and the second terminal of the second capacitor C2, and is used to control the charging and discharging of the first capacitor C1 and the second capacitor C2 under the control of the scanning signal and the charging signal, so as to realize Potential reset and storage of threshold voltage. In the embodiment of the utility model, the charging control module 11 is also used to receive the data voltage signal for driving the light-emitting device OLED to emit light, so as to control the first capacitor C1 and the second capacitor C2 to store the data voltage for driving the light-emitting device OLED to emit light. The light emission control module 12 is connected to the source of the driving transistor T1 and the light emitting device OLED, and is used to make the driving transistor T1 drive the light emitting device OLED to emit light under the control of the light emitting control signal.
较佳的，本实用新型实施例中充电控制模块11包括第二开关晶体管T3。Preferably, the charging control module 11 in the embodiment of the present utility model includes a second switching transistor T3.
图4所示为本实用新型实施例提供的像素电路构成示意图，图4中第二开关晶体管T3的漏极连接数据电压源D1，栅极连接第二门信号源S2，源极连接第一电容C1的第一端和第二电容C2的第二端，即第一电容C1的第一端、第二电容C2的第二端以及第二开关晶体管T3的源极共同连接于节点b。第二开关晶体管T3在扫描信号和充电信号的控制下，能够控制第一电容C1和第二电容C2充放电，使第一电容C1和第二电容C2的连接端的电位重置为参考复位电压的电位，将参考复位电压存储在节点b。第一门信号源S1与第一开关晶体管T2的栅极连接，以控制第一开关晶体管T2导通或截止，第一开关晶体管T2导通时能够实现驱动晶体管T1的二极管连接方式，从而可以使第一电容C1在驱动晶体管T1以二极管连接方式下充放电，并使驱动晶体管T1进入饱和状态，使第一电容C1存储驱动晶体管T1阈值电压的存储，完成驱动晶体管T1阈值电压的存储。FIG. 4 is a schematic diagram of the pixel circuit provided by the embodiment of the present invention. In FIG. 4, the drain of the second switching transistor T3 is connected to the data voltage source D1, the gate is connected to the second gate signal source S2, and the source is connected to the first capacitor. The first terminal of C1 and the second terminal of the second capacitor C2, that is, the first terminal of the first capacitor C1, the second terminal of the second capacitor C2 and the source of the second switching transistor T3 are commonly connected to the node b. Under the control of the scanning signal and the charging signal, the second switching transistor T3 can control the charge and discharge of the first capacitor C1 and the second capacitor C2, so that the potential of the connection terminal of the first capacitor C1 and the second capacitor C2 is reset to the reference reset voltage. Potential, store the reference reset voltage at node b. The first gate signal source S1 is connected to the gate of the first switching transistor T2 to control the first switching transistor T2 to be turned on or off. When the first switching transistor T2 is turned on, the diode connection mode of the driving transistor T1 can be realized, so that the The first capacitor C1 is charged and discharged in the diode connection mode of the driving transistor T1, and the driving transistor T1 enters a saturated state, so that the first capacitor C1 stores the storage of the threshold voltage of the driving transistor T1, and completes the storage of the threshold voltage of the driving transistor T1.
更进一步的，本实用新型实施例中发光控制模块12包括第三开关晶体管T4。Furthermore, in the embodiment of the present utility model, the light emission control module 12 includes a third switching transistor T4.
图5为本实用新型实施例提供的像素电路的构成示意图，图5中第三开关晶体管T4的栅极连接第三门信号源S3，由第三门信号源输出控制第三开关晶体管导通或截止的电平信号。第三开关晶体管T4的漏极连接驱动晶体管T1的源极，第三开关晶体管T4的源极连接发光器件3的第一端。第三开关晶体管T4能够在发光控制信号控制下，控制发光器件3发光或者不发光，第三开关晶体管T4导通时，能够控制发光器件3发光。本实用新型实施例中发光器件3为OLED时，该第一端可为OLED的阳极，即第三开关晶体管T4的源极连接OLED的阳极。5 is a schematic diagram of the composition of the pixel circuit provided by the embodiment of the present invention. In FIG. 5, the gate of the third switching transistor T4 is connected to the third gate signal source S3, and the third gate signal source outputs to control the third switching transistor to turn on or cut-off level signal. The drain of the third switching transistor T4 is connected to the source of the driving transistor T1 , and the source of the third switching transistor T4 is connected to the first end of the light emitting device 3 . The third switching transistor T4 can control the light emitting device 3 to emit light or not to emit light under the control of the light emitting control signal, and can control the light emitting device 3 to emit light when the third switching transistor T4 is turned on. In the embodiment of the present invention, when the light-emitting device 3 is an OLED, the first terminal may be the anode of the OLED, that is, the source of the third switching transistor T4 is connected to the anode of the OLED.
进一步的，本实用新型实施例中发光器件3未与第三开关晶体管T4连接的第二端（OLED的阴极）连接到接地电路，该接地电路可以是显示面板中的共同接地电位，本实用新型实施例中以GND表示。Further, in the embodiment of the present utility model, the second terminal (cathode of the OLED) of the light-emitting device 3 that is not connected to the third switching transistor T4 is connected to the ground circuit, and the ground circuit may be the common ground potential in the display panel. The utility model It is represented by GND in the embodiment.
本实用新型实施例中第一开关晶体管T2、第二开关晶体管T3和第三开关晶体管T4可以为N型晶体管，也可以是P型晶体管，本实用新型实施例并不做限定。本实用新型实施例优选第一开关晶体管T2、第二开关晶体管T3和第三开关晶体管T4均为P型晶体管或均为N型晶体管，以简化使进行像素电路驱动时的驱动时序。In the embodiment of the utility model, the first switching transistor T2, the second switching transistor T3 and the third switching transistor T4 may be N-type transistors or P-type transistors, which are not limited in this embodiment of the utility model. In the embodiment of the present invention, it is preferred that the first switching transistor T2, the second switching transistor T3 and the third switching transistor T4 are all P-type transistors or all are N-type transistors, so as to simplify the driving sequence when driving the pixel circuit.
本实用新型实施例提供的像素电路，补偿子电路在控制子电路的控制下能够完成电位复位，并存储驱动晶体管的阈值电压，能够较好的在驱动晶体管驱动发光器件发光时，补偿驱动晶体管的阈值电压，最终使得驱动发光器件发光的驱动电流与驱动晶体管的阈值电压没有关系，改善面板的显示均匀性。In the pixel circuit provided by the embodiment of the present invention, the compensation sub-circuit can complete the potential reset under the control of the control sub-circuit, and store the threshold voltage of the driving transistor, and can better compensate the driving transistor when the driving transistor drives the light-emitting device to emit light. The threshold voltage finally makes the driving current for driving the light-emitting device to emit light irrelevant to the threshold voltage of the driving transistor, thereby improving the display uniformity of the panel.
基于上述实施例涉及的像素电路，本实用新型实施例还提供一种像素电路的驱动方法。Based on the pixel circuit involved in the above embodiments, the embodiment of the present invention further provides a driving method of the pixel circuit.
具体的，像素电路驱动发光器件发光并实现画面显示的过程包括初始化阶段、数据写入阶段和发光阶段，具体驱动过程如下：Specifically, the process of the pixel circuit driving the light-emitting device to emit light and realize the screen display includes an initialization stage, a data writing stage and a light-emitting stage. The specific driving process is as follows:
初始化阶段，可变电压源向驱动晶体管的漏极输出低电位电压，控制子电路控制补偿子电路完成电位复位，并控制驱动晶体管进入饱和状态，使补偿子电路存储驱动晶体管的阈值电压。In the initialization stage, the variable voltage source outputs a low potential voltage to the drain of the driving transistor, the control subcircuit controls the compensation subcircuit to complete potential reset, and controls the driving transistor to enter a saturated state, so that the compensation subcircuit stores the threshold voltage of the driving transistor.
数据写入阶段，可变电压源向驱动晶体管的漏极输出高电位电压，控制子电路控制驱动发光器件发光的数据电压信号写入补偿子电路；In the data writing phase, the variable voltage source outputs a high potential voltage to the drain of the drive transistor, and the control sub-circuit controls the data voltage signal for driving the light-emitting device to emit light and writes it into the compensation sub-circuit;
发光阶段，可变电压源向驱动晶体管的漏极输出高电位电压，控制子电路和补偿子电路控制驱动晶体管驱动发光器件发光，并通过补偿子电路存储的阈值电压补偿所述驱动晶体管的阈值电压，使驱动晶体管产生的驱动电流的电流值与所述驱动晶体管的阈值电压无关。In the lighting stage, the variable voltage source outputs a high potential voltage to the drain of the driving transistor, the control subcircuit and the compensation subcircuit control the driving transistor to drive the light emitting device to emit light, and compensate the threshold voltage of the driving transistor through the threshold voltage stored in the compensation subcircuit , so that the current value of the driving current generated by the driving transistor has nothing to do with the threshold voltage of the driving transistor.
本实用新型实施例中补偿子电路能够完成电位的复位，并存储所述驱动晶体管的阈值电压。控制子电路在发光控制信号控制下，控制驱动晶体管驱动发光器件发光，补偿子电路利用该阈值电压补偿驱动晶体管的阈值电压，使得驱动发光器件发光的驱动电流与驱动晶体管的阈值电压没有关系，改善面板的显示均匀性。In the embodiment of the utility model, the compensation sub-circuit can complete the potential reset and store the threshold voltage of the driving transistor. The control subcircuit controls the driving transistor to drive the light emitting device to emit light under the control of the light emitting control signal, and the compensation subcircuit uses the threshold voltage to compensate the threshold voltage of the driving transistor, so that the driving current for driving the light emitting device to emit light has nothing to do with the threshold voltage of the driving transistor, improving Display uniformity of the panel.
进一步的，本实用新型实施例中补偿子电路包括第一电容、第二电容和第一开关晶体管，进行图2所示的像素电路的驱动过程中，补偿子电路完成电位复位，并控制驱动晶体管进入饱和状态，补偿子电路存储驱动晶体管的阈值电压，可优选如下方式：Further, the compensation sub-circuit in the embodiment of the present invention includes a first capacitor, a second capacitor and a first switching transistor. During the driving process of the pixel circuit shown in FIG. 2 , the compensation sub-circuit completes potential reset and controls the drive transistor When entering a saturated state, the compensation subcircuit stores the threshold voltage of the drive transistor, which can be preferably as follows:
参考电压源输出参考复位电压的电位，控制子电路控制第一电容和第二电容充放电，使第一电容和第二电容的连接端存储的电位复位为参考复位电压的电位；The reference voltage source outputs the potential of the reference reset voltage, and the control subcircuit controls the charging and discharging of the first capacitor and the second capacitor, so that the potential stored at the connection end of the first capacitor and the second capacitor is reset to the potential of the reference reset voltage;
第一门信号源输出使所述第一开关晶体管导通的电平信号，使驱动晶体管处于二极管连接方式，并控制第一电容在驱动晶体管以二极管连接方式下充放电，使驱动晶体管进入饱和状态，使第一电容存储驱动晶体管的阈值电压，可以在完成复位的同时，使驱动晶体管进入饱和状态，完成驱动晶体管阈值电压的存储。The first gate signal source outputs a level signal to turn on the first switching transistor, so that the driving transistor is in a diode-connected mode, and controls the first capacitor to charge and discharge when the driving transistor is in a diode-connected mode, so that the driving transistor enters a saturated state The first capacitor is used to store the threshold voltage of the driving transistor, so that the driving transistor enters a saturated state while the reset is completed, and the storage of the threshold voltage of the driving transistor is completed.
更进一步的，本实用新型实施例中控制子电路包括充电控制模块和发光控制模块，充电控制模块包括第二开关晶体管，发光控制模块包括第三开关晶体管，进行图5所示的像素电路的驱动过程，可优选如下方式：Furthermore, the control sub-circuit in the embodiment of the present utility model includes a charging control module and a light emitting control module, the charging control module includes a second switching transistor, and the light emitting control module includes a third switching transistor to drive the pixel circuit shown in Figure 5 The process can preferably be as follows:
初始化阶段，具体包括：The initialization phase, specifically includes:
第一门信号源输出使第一开关晶体管导通的电平信号，第二门信号源输出使第二开关晶体管导通的电平信号，第三门信号源输出使第三开关晶体管截止的电平信号，参考电压源向第二电容未与第一电容连接的一端输出参考复位电压的电位，数据电压源通过导通的第二开关晶体管向第一电容与第二电容的连接端输出低电位电压，第一电容和第二电容的连接端存储参考复位电压的电位，第一电容未与第二电容连接的一端在驱动晶体管以二极管连接的方式下充放电，使驱动晶体管进入饱和状态，第一电容存储驱动晶体管的阈值电压。The first gate signal source outputs a level signal for turning on the first switching transistor, the second gate signal source outputs a level signal for turning on the second switching transistor, and the third gate signal source outputs a level signal for turning off the third switching transistor. level signal, the reference voltage source outputs the potential of the reference reset voltage to the end of the second capacitor that is not connected to the first capacitor, and the data voltage source outputs a low potential to the connection end of the first capacitor and the second capacitor through the turned-on second switching transistor Voltage, the connection end of the first capacitor and the second capacitor stores the potential of the reference reset voltage, and the end of the first capacitor not connected to the second capacitor is charged and discharged in the way that the drive transistor is connected with a diode, so that the drive transistor enters a saturated state. A capacitor stores the threshold voltage of the drive transistor.
数据写入阶段，具体包括：Data writing stage, specifically including:
第一门信号源输出使第一开关晶体管截止的电平信号，第二门信号源输出使第二开关晶体管导通的电平信号，第三门信号源输出使第三开关晶体管截止的电平信号，数据电压源输出数据电压信号，第二电容存储所述数据电压。The first gate signal source outputs a level signal to turn off the first switching transistor, the second gate signal source outputs a level signal to turn on the second switching transistor, and the third gate signal source outputs a level signal to turn off the third switching transistor signal, the data voltage source outputs a data voltage signal, and the second capacitor stores the data voltage.
发光阶段，具体包括：The luminescence phase, specifically includes:
第一门信号源输出使第一开关晶体管截止的电平信号，第二门信号源输出使第二开关晶体管截止的电平信号，第三门信号源输出使第三开关晶体管导通的电平信号，驱动晶体管驱动发光器件发光，并通过第一电容存储的阈值电压对驱动晶体管的阈值电压进行补偿，使驱动晶体管产生的驱动电流的电流值与所述驱动晶体管的阈值电压无关。The first gate signal source outputs a level signal to turn off the first switching transistor, the second gate signal source outputs a level signal to turn off the second switching transistor, and the third gate signal source outputs a level signal to turn on the third switching transistor signal, the driving transistor drives the light-emitting device to emit light, and compensates the threshold voltage of the driving transistor through the threshold voltage stored in the first capacitor, so that the current value of the driving current generated by the driving transistor has nothing to do with the threshold voltage of the driving transistor.
本实用新型以下将结合附图5中的像素电路，对本实用新型实施例涉及的像素电路的驱动实现方式进行详细说明。In the following, the utility model will describe in detail the driving implementation of the pixel circuit involved in the embodiment of the utility model in conjunction with the pixel circuit in Fig. 5 .
需要说明的是，本实用新型实施例以第一开关晶体管T2、第二开关晶体管T3和第三开关晶体管T4均为N型晶体管为例，进行举例说明，对于第一开关晶体管T2、第二开关晶体管T3和第三开关晶体管T4均为P型晶体管的实现方式，与此类似，只是相应的信号电平相反。It should be noted that, in the embodiment of the present utility model, the first switch transistor T2, the second switch transistor T3 and the third switch transistor T4 are all N-type transistors as an example for illustration. For the first switch transistor T2, the second switch transistor Both the transistor T3 and the third switching transistor T4 are realized in the manner of a P-type transistor, which is similar to this, except that the corresponding signal levels are reversed.
图6所示为本实用新型实施例中第一开关晶体管T2、第二开关晶体管T3和第三开关晶体管T4均为N型晶体管的像素电路驱动时序图，主要包括初始化阶段P1、数据写入阶段P2和发光阶段P3。Fig. 6 is a driving sequence diagram of the pixel circuit in which the first switch transistor T2, the second switch transistor T3 and the third switch transistor T4 are all N-type transistors in the embodiment of the utility model, which mainly includes the initialization phase P1 and the data writing phase P2 and light-emitting phase P3.
初始化阶段initialization phase
第一门信号源S1输出高电平信号，使第一开关晶体管T2导通；第二门信号源S2输出高电平信号，使第二开关晶体管T3导通；第三门信号源S3输出低电平信号，使第三开关晶体管T4截止，等效电路图如图7A所示。The first gate signal source S1 outputs a high-level signal to turn on the first switching transistor T2; the second gate signal source S2 outputs a high-level signal to turn on the second switching transistor T3; the third gate signal source S3 outputs a low The level signal turns off the third switching transistor T4, and the equivalent circuit diagram is shown in FIG. 7A.
在图7A所示的等效电路图中，第二开关晶体管T3被导通，数据电压源输出的数据电压信号Vdata为低电位Vss，参考电压源输出的参考复位电压的电位Vreset为Vss，可变电压源输出的电源信号Vref也为低电位Vss，故第一电容C1和第二电容C2将被重置，使得第一电容C1和第二电容C2在上一显示阶段中存储的数据电压被清除，并且低电位Vss将被存储于节点b，完成电位的复位。In the equivalent circuit diagram shown in FIG. 7A, the second switching transistor T3 is turned on, the data voltage signal Vdata output by the data voltage source is a low potential Vss, and the potential Vreset of the reference reset voltage output by the reference voltage source is Vss, which is variable. The power signal Vref output by the voltage source is also low potential Vss, so the first capacitor C1 and the second capacitor C2 will be reset, so that the data voltage stored in the first capacitor C1 and the second capacitor C2 in the previous display stage will be cleared , and the low potential Vss will be stored in the node b to complete the reset of the potential.
在图7A所示的等效电路图中，第一开关晶体管T2导通，使得驱动晶体管T1的源极与栅极连接，使得第一电容C1在驱动晶体管T1以二极管连接方式下充放电，直至驱动晶体管T1自动截止，进而使得第一电容C1、第一开关晶体管T2和驱动晶体管T1的栅极连接的节点a的电压为Vss+Vth，第一电容C1存储驱动晶体管T1自动截止的阈值电压。In the equivalent circuit diagram shown in FIG. 7A , the first switching transistor T2 is turned on, so that the source of the driving transistor T1 is connected to the gate, so that the first capacitor C1 is charged and discharged in the diode-connected manner of the driving transistor T1 until the driving The transistor T1 is automatically turned off, so that the voltage of the node a connected to the gate of the first capacitor C1, the first switching transistor T2 and the driving transistor T1 is Vss+Vth, and the first capacitor C1 stores the threshold voltage for automatically turning off the driving transistor T1.
本实用新型实施例中通过上述驱动方式，在初始化阶段同时完成了第一电容C1及第二电容C2的复位，以及驱动晶体管T1阈值电压Vth的存储。In the embodiment of the present invention, the reset of the first capacitor C1 and the second capacitor C2 and the storage of the threshold voltage Vth of the driving transistor T1 are simultaneously completed in the initialization stage through the above-mentioned driving method.
数据写入阶段data writing stage
第一门信号源S1输出低电平信号，使第一开关晶体管T2截止；第二门信号源S2输出高电平信号，使第二开关晶体管T3导通；第三门信号源S3输出低电平信号，使第三开关晶体管T4截止，等效电路图如图7B所示。The first gate signal source S1 outputs a low-level signal to turn off the first switching transistor T2; the second gate signal source S2 outputs a high-level signal to turn on the second switching transistor T3; the third gate signal source S3 outputs a low-level signal A flat signal turns off the third switching transistor T4, and the equivalent circuit diagram is shown in FIG. 7B.
可变电压源输出的电源信号Vref的电压电平为高电位Vdd，数据电压源输出的数据电压信号为用于驱动发光器件发光的数据电压Vdata，该数据电压Vdata输入至节点b，并存储在第二电容C2中，基于第一电容C1的升压效应，此时，节点a的电位会升高至Vdata+Vth。The voltage level of the power signal Vref output by the variable voltage source is a high potential Vdd, and the data voltage signal output by the data voltage source is the data voltage Vdata used to drive the light emitting device to emit light. The data voltage Vdata is input to node b and stored in In the second capacitor C2, based on the boost effect of the first capacitor C1, the potential of the node a will increase to Vdata+Vth at this time.
发光阶段glow stage
第一门信号源S1输出低电平信号，使第一开关晶体管T2截止；第二门信号源S2输出低电平信号，使第二开关晶体管T3截止；第三门信号源S3输出高电平信号，使第三开关晶体管T4导通，等效电路图如图7C所示。The first gate signal source S1 outputs a low-level signal to turn off the first switching transistor T2; the second gate signal source S2 outputs a low-level signal to turn off the second switching transistor T3; the third gate signal source S3 outputs a high level signal to turn on the third switching transistor T4, and the equivalent circuit diagram is shown in FIG. 7C.
图7C所示的等效电路图中，第三开关晶体管T4被导通，驱动晶体管T1的栅源电压为Vgs=Vdata+Vth-Voled，其中，Voled为OLED两端的电压。故本实用新型实施例中驱动晶体管T1产生的驱动电流IOLED可以表示为如下方程式：In the equivalent circuit diagram shown in FIG. 7C , the third switching transistor T4 is turned on, and the gate-source voltage of the driving transistor T1 is Vgs=Vdata+Vth-Voled, where Voled is the voltage across the OLED. Therefore, the driving current IOLED generated by the driving transistor T1 in the embodiment of the present invention can be expressed as the following equation:
其中，K为驱动晶体管T1的电流常数，Voled在长时间使用后也会趋向于一个常数。故由上述方程式可知，在发光阶段，流经有机发光二极管OLED的驱动电流IOLED与驱动晶体管T1的阈值电压（Vth）并不相关，可有效的改善显示面板的不均匀性，使显示亮度更为均匀。Among them, K is the current constant of the driving transistor T1, and Voled will tend to be a constant after a long time of use. Therefore, it can be seen from the above equation that in the light-emitting stage, the driving current IOLED flowing through the organic light-emitting diode OLED is not related to the threshold voltage (Vth) of the driving transistor T1, which can effectively improve the unevenness of the display panel and make the display brightness more uniform.
本实用新型实施例提供的像素电路的驱动方式，通过可变电压源输入可变参考电压，能够同时完成电位的复位以及驱动晶体管的阈值电压的存储，能够较好的在驱动晶体管驱动发光器件发光时，补偿驱动晶体管的阈值电压，最终使得驱动发光器件发光的驱动电流与驱动晶体管的阈值电压没有关系，改善面板的显示均匀性。The driving mode of the pixel circuit provided by the embodiment of the utility model can realize the reset of the potential and the storage of the threshold voltage of the driving transistor at the same time through the input of the variable reference voltage through the variable voltage source, and can better drive the light-emitting device to emit light when the driving transistor When the threshold voltage of the driving transistor is compensated, finally the driving current for driving the light-emitting device to emit light has no relationship with the threshold voltage of the driving transistor, thereby improving the display uniformity of the panel.
较佳的，本实用新型实施例上述初始化阶段完成电位的复位以及驱动晶体管的阈值电压的存储，需要第一门信号源S1和第二门信号源S2分别输出相应的电平控制信号，控制第一开关晶体管T2和第二开关晶体管T3导通，并通过数据电压源输出低电位Vss，使第一电容C1和第二电容C2重置，并将低电位Vss存储于节点b，实现电位的复位，即采用图5所示的像素电路进行像素电路驱动时，需要改变数据电压源的输出时序，才能实现复位，驱动时序控制复杂，并且由于第一开关晶体管T2导通时开启电压的存在，若该开启电压不可忽略，则第一电容C1存储的电压将会包括第一开关晶体管T2的导通电压，故本实用新型实施例中提供另一种像素电路，该像素电路包括第四开关晶体管T5，如图8所示。Preferably, the reset of the potential and the storage of the threshold voltage of the driving transistor are completed in the above-mentioned initialization stage of the embodiment of the utility model, and the first gate signal source S1 and the second gate signal source S2 are required to output corresponding level control signals respectively to control the first gate signal source S1. A switch transistor T2 and a second switch transistor T3 are turned on, and output a low potential Vss through the data voltage source, so that the first capacitor C1 and the second capacitor C2 are reset, and the low potential Vss is stored in the node b to realize the reset of the potential , that is, when the pixel circuit shown in FIG. 5 is used to drive the pixel circuit, it is necessary to change the output timing of the data voltage source to realize the reset. The driving timing control is complicated, and due to the existence of the turn-on voltage when the first switching transistor T2 is turned on, if The turn-on voltage cannot be ignored, and the voltage stored in the first capacitor C1 will include the turn-on voltage of the first switching transistor T2, so another pixel circuit is provided in the embodiment of the present invention, and the pixel circuit includes a fourth switching transistor T5 , as shown in Figure 8.
图8中，第四开关晶体管T5的栅极与第一门信号源S1连接，漏极与第二电容C2的第二端、第一电容C1的第一端连接，即第四开关晶体管T5的漏极连接于节点b，源极与驱动晶体管的漏极连接于节点d，故在初始化阶段，可变电压源可通过导通的第四开关晶体管T5将低电位电压写入至第一电容C1和第二电容C2的连接端b点，从而实现第一电容C1和第二电容C2的重置，完成电位的复位，无需改变数据电压源输出信号的驱动时序。In FIG. 8, the gate of the fourth switching transistor T5 is connected to the first gate signal source S1, and the drain is connected to the second terminal of the second capacitor C2 and the first terminal of the first capacitor C1, that is, the gate of the fourth switching transistor T5 The drain is connected to node b, and the source and the drain of the driving transistor are connected to node d, so in the initialization phase, the variable voltage source can write a low potential voltage to the first capacitor C1 through the turned-on fourth switching transistor T5 and the connection terminal b of the second capacitor C2, so as to realize the reset of the first capacitor C1 and the second capacitor C2, and complete the potential reset without changing the driving timing of the output signal of the data voltage source.
本实用新型实施例中图8所示的像素电路的驱动过程包括：The driving process of the pixel circuit shown in Figure 8 in the embodiment of the utility model includes:
初始化阶段，具体包括：The initialization phase, specifically includes:
第一门信号源输出使第一开关晶体管和所述第四开关晶体管导通的电平信号，第二门信号源输出使第二开关晶体管截止的电平信号，第三门信号源输出使第三开关晶体管截止的电平信号，参考电压源向第二电容未与第一电容连接的一端输出参考复位电压的电位，可变电压源通过导通的第四开关晶体管向第一电容与第二电容的连接端输出低电位电压，第一电容和第二电容的连接端存储参考复位电压的电位，第一电容未与第二电容连接的一端在驱动晶体管以二极管连接的方式下充放电，使驱动晶体管进入饱和状态，第一电容存储驱动晶体管的阈值电压。The first gate signal source outputs a level signal for turning on the first switch transistor and the fourth switch transistor, the second gate signal source outputs a level signal for turning off the second switch transistor, and the third gate signal source outputs a level signal for turning on the fourth switch transistor. The level signal of the cut-off of the three switch transistors, the reference voltage source outputs the potential of the reference reset voltage to the end of the second capacitor that is not connected to the first capacitor, and the variable voltage source supplies the first capacitor and the second capacitor through the turned-on fourth switch transistor. The connecting end of the capacitor outputs a low potential voltage, the connecting end of the first capacitor and the second capacitor store the potential of the reference reset voltage, and the end of the first capacitor not connected to the second capacitor is charged and discharged in a diode-connected manner of the driving transistor, so that The driving transistor enters a saturated state, and the first capacitor stores the threshold voltage of the driving transistor.
数据写入阶段，具体包括：Data writing phase, specifically including:
第一门信号源输出使第一开关晶体管和所述第四开关晶体管截止的电平信号，第二门信号源输出使第二开关晶体管导通的电平信号，第三门信号源输出使第三开关晶体管截止的电平信号，数据电压源输出数据电压信号，第二电容存储数据电压。The first gate signal source outputs a level signal for turning off the first switching transistor and the fourth switching transistor, the second gate signal source outputs a level signal for turning on the second switching transistor, and the third gate signal source outputs a level signal for turning on the fourth switching transistor. The level signal of the cut-off of the three switching transistors, the data voltage source outputs the data voltage signal, and the second capacitor stores the data voltage.
发光阶段，具体包括：The luminescence phase, specifically includes:
第一门信号源输出使第一开关晶体管和第四开关晶体管截止的电平信号，第二门信号源输出使第二开关晶体管截止的电平信号，第三门信号源输出使第三开关晶体管导通的电平信号，驱动晶体管驱动发光器件发光，并通过第一电容存储的阈值电压对所述驱动晶体管的阈值电压进行补偿，使驱动晶体管产生的驱动电流的电流值与阈值电压无关。The first gate signal source outputs the level signal that makes the first switch transistor and the fourth switch transistor cut off, the second gate signal source outputs the level signal that makes the second switch transistor cut off, and the third gate signal source outputs the third switch transistor The turned-on level signal drives the driving transistor to drive the light-emitting device to emit light, and compensates the threshold voltage of the driving transistor through the threshold voltage stored in the first capacitor, so that the current value of the driving current generated by the driving transistor has nothing to do with the threshold voltage.
本实用新型以下将结合附图9中所示的像素电路驱动时序图，对图8中的像素电路的驱动实现方式进行详细说明。In the following, the present invention will describe in detail the driving implementation of the pixel circuit in FIG. 8 in conjunction with the pixel circuit driving timing diagram shown in FIG. 9 .
需要说明的是，本实用新型实施例以第一开关晶体管T2、第二开关晶体管T3、第三开关晶体管T4和第四开关晶体管T5均为N型晶体管为例，进行举例说明，对于第一开关晶体管T2、第二开关晶体管T3、第三开关晶体管T4和第四开关晶体管T5均为P型晶体管的实现方式，与此类似，只是相应的信号电平相反。It should be noted that, in the embodiment of the present utility model, the first switch transistor T2, the second switch transistor T3, the third switch transistor T4 and the fourth switch transistor T5 are all N-type transistors as an example for illustration. For the first switch The transistor T2 , the second switch transistor T3 , the third switch transistor T4 and the fourth switch transistor T5 are all realized in the manner of P-type transistors, which are similar to this except that the corresponding signal levels are reversed.
本实用新型实施例中图9所示的像素电路的驱动时序主要包括初始化阶段P1、数据写入阶段P2和发光阶段P3，本实用新型实施例中图8所示的像素电路的驱动实现过程与图5中所示的像素电路的驱动实现过程仅在初始化阶段不同，其它过程类似，故本实用新型实施例中仅就不同之处进行说明，其它类似之处，在此不再赘述。The driving sequence of the pixel circuit shown in FIG. 9 in the embodiment of the utility model mainly includes the initialization phase P1, the data writing phase P2 and the light emitting phase P3. The driving implementation process of the pixel circuit shown in FIG. 8 in the embodiment of the utility model is the same as The driving implementation process of the pixel circuit shown in FIG. 5 is only different in the initialization stage, and other processes are similar. Therefore, only the differences will be described in the embodiment of the present invention, and other similarities will not be repeated here.
初始化阶段initialization phase
第一门信号源S1输出高电平信号，使第一开关晶体管T2和第四开关晶体管T5导通；第二门信号源S2输出低电平信号，使第二开关晶体管T3截止；第三门信号源S3输出低电平信号，使第三开关晶体管T4截止。The first gate signal source S1 outputs a high-level signal to turn on the first switching transistor T2 and the fourth switching transistor T5; the second gate signal source S2 outputs a low-level signal to turn off the second switching transistor T3; the third gate The signal source S3 outputs a low level signal to turn off the third switching transistor T4.
参考电压源输出的参考复位电压的电位Vreset为Vss，可变电压源输出的电源信号Vref也为低电位Vss，并且可变电压源输出的低电位信号可通过导通的第四开关晶体管T5写入至第一电容C1和第二电容C2的连接端，即b点，故在此阶段与图8中像素电路不同之处就在于，此时数据电压源无需输出低电位电压，即可实现将第一电容C1和第二电容C2的重置，使第一电容C1和第二电容C2在上一显示阶段中存储的数据电压被清除，并且低电位Vss也被存储于节点b，实现电位的复位。The potential Vreset of the reference reset voltage output by the reference voltage source is Vss, the power signal Vref output by the variable voltage source is also a low potential Vss, and the low potential signal output by the variable voltage source can be written through the turned-on fourth switching transistor T5 input to the connection terminal of the first capacitor C1 and the second capacitor C2, that is, point b, so the difference between this stage and the pixel circuit in Fig. The reset of the first capacitor C1 and the second capacitor C2 clears the data voltage stored in the first capacitor C1 and the second capacitor C2 in the previous display stage, and the low potential Vss is also stored in the node b, realizing the potential adjustment reset.
更进一步的，本实用新型实施例中若不忽略开关晶体管的开启电压，假设各开关晶体管的开启电压为Vk，则在初始化阶段过程中，第一开关晶体管T2和第四开关晶体管T5被导通时，则b点的电位Vss+Vk，c点的电位为Vth，a点的电位为Vss+Vth+Vk，则第一电容C1存储的电压为（Vss+Vk）-（Vss+Vth+Vk）=Vth，即图8所示的像素电路，可以避免第四开关晶体管T5和第一开关晶体管T2的开启电压的影响。Furthermore, if the turn-on voltage of the switch transistors is not ignored in the embodiment of the present utility model, assuming that the turn-on voltage of each switch transistor is Vk, then during the initialization phase, the first switch transistor T2 and the fourth switch transistor T5 are turned on , then the potential at point b is Vss+Vk, the potential at point c is Vth, and the potential at point a is Vss+Vth+Vk, then the voltage stored in the first capacitor C1 is (Vss+Vk)-(Vss+Vth+Vk )=Vth, that is, the pixel circuit shown in FIG. 8 can avoid the influence of the turn-on voltages of the fourth switching transistor T5 and the first switching transistor T2.
需要说明的是，本实用新型实施例中第一开关晶体管T2、第二开关晶体管T3、第三开关晶体管T4和第四开关晶体管T5可以为同类型的薄膜晶体管，也可为不同类型的薄膜晶体管，只需要配以相应的时序，实现上述功能即可，在此不做限定。本实用新型实施例中为了简化制作工艺，本实用新型实施例中优选第一开关晶体管T2、第二开关晶体管T3、第三开关晶体管T4和第四开关晶体管T5均为P型晶体管或者均为N型晶体管。It should be noted that the first switching transistor T2, the second switching transistor T3, the third switching transistor T4 and the fourth switching transistor T5 in the embodiment of the present utility model can be the same type of thin film transistors, or different types of thin film transistors , it only needs to be matched with a corresponding timing sequence to realize the above functions, which is not limited here. In order to simplify the manufacturing process in the embodiment of the utility model, in the embodiment of the utility model, it is preferred that the first switch transistor T2, the second switch transistor T3, the third switch transistor T4 and the fourth switch transistor T5 are all P-type transistors or all are N transistors. type transistor.
基于上述实施例提供的像素电路，本实用新型实施例提供一种显示面板，本实用新型实施例提供的显示面板包括由栅线和数据线限定的若干个呈矩阵排列的像素单元，每一所述像素单元中包括一个上述涉及的像素电路。Based on the pixel circuits provided by the above embodiments, the embodiments of the present invention provide a display panel. The display panel provided by the embodiments of the present invention includes several pixel units arranged in a matrix defined by gate lines and data lines. The pixel unit includes one pixel circuit mentioned above.
图10所示为本实用新型实施例提供的显示面板构成示意图，图10中，包括：Fig. 10 is a schematic diagram showing the composition of the display panel provided by the embodiment of the present invention. In Fig. 10, it includes:
多条沿行方向分布的栅线，如图10中所示的S1、S2、……、Sn；A plurality of grid lines distributed along the row direction, such as S1, S2, ..., Sn shown in FIG. 10;
多条沿列方向分布的数据线，如图10中所示的D1、D2、……、Dm；A plurality of data lines distributed along the column direction, such as D1, D2, ..., Dm shown in Figure 10;
相邻的两条栅线和数据线限定一个像素单元10，由多条上述栅线和多条上述数据线限定构成若干个呈矩阵排列的像素单元10；Two adjacent gate lines and data lines define a pixel unit 10, and several pixel units 10 arranged in a matrix are defined by a plurality of the above-mentioned gate lines and a plurality of the above-mentioned data lines;
上述每一像素单元中包括本实用新型上述实施例提供的像素电路10，位于同一行的像素电路10与同一条栅线相连，位于同一列的像素电路10与同一条数据线相连。Each pixel unit includes the pixel circuit 10 provided by the above embodiment of the present invention, the pixel circuits 10 in the same row are connected to the same gate line, and the pixel circuits 10 in the same column are connected to the same data line.
较佳的，本实用新型实施例中的显示面板还包括该显示面板还包括第一电源信号线L1、第二电源信号线L2，若干条控制信号线M1、M2、……、Mn，其中，Preferably, the display panel in the embodiment of the present utility model further includes that the display panel also includes a first power signal line L1, a second power signal line L2, and several control signal lines M1, M2, ..., Mn, wherein,
像素电路中的驱动晶体管T1的漏极通过第一电源信号线L1与可变电压源P1连接。The drain of the driving transistor T1 in the pixel circuit is connected to the variable voltage source P1 through the first power signal line L1.
第二电容C2的第一端通过第二电源信号线L2与参考电压源P2连接。The first end of the second capacitor C2 is connected to the reference voltage source P2 through the second power signal line L2.
第一开关晶体管的栅极通过控制信号线与第一门信号源连接。The gate of the first switching transistor is connected to the first gate signal source through the control signal line.
第二开关晶体管的栅极通过栅线与第二门信号源连接，漏极通过数据线与数据电压源连接。The gate of the second switching transistor is connected to the second gate signal source through the gate line, and the drain is connected to the data voltage source through the data line.
第三开关晶体管的栅极通过控制信号线与第三门信号源连接。The gate of the third switch transistor is connected to the third gate signal source through the control signal line.
本实用新型实施例提供的显示面板，像素电路中的补偿子电路在控制子电路的控制下，能够完成电位的复位，并存储驱动晶体管的阈值电压，能够较好的在驱动晶体管驱动发光器件发光时，补偿驱动晶体管的阈值电压，最终使得驱动发光器件发光的驱动电流与驱动晶体管的阈值电压没有关系，改善面板的显示均匀性。In the display panel provided by the embodiment of the present invention, the compensation sub-circuit in the pixel circuit can complete the potential reset under the control of the control sub-circuit, and store the threshold voltage of the driving transistor, so that the driving transistor can drive the light-emitting device to emit light. When the threshold voltage of the driving transistor is compensated, finally the driving current for driving the light-emitting device to emit light has no relationship with the threshold voltage of the driving transistor, thereby improving the display uniformity of the panel.
本实用新型实施例还提供了一种显示装置，包括上述实施例涉及的显示面板，其他结构与现有结构相同，在此不再赘述。The embodiment of the present invention also provides a display device, which includes the display panel involved in the above embodiments, and other structures are the same as the existing structures, and will not be repeated here.
需要说明的是，本实用新型实施例提供的显示装置可以为有机电致发光显示OLED面板、OLED显示器、OLED电视或电子纸等显示装置。It should be noted that the display device provided by the embodiment of the present invention may be an organic electroluminescence display OLED panel, an OLED display, an OLED TV, or an electronic paper.
本实用新型实施例提供的显示装置，显示面板的像素电路中的补偿子电路在控制子电路的控制下，能够完成电位的复位，并存储驱动晶体管的阈值电压，能够较好的在驱动晶体管驱动发光器件发光时，补偿驱动晶体管的阈值电压，最终使得驱动发光器件发光的驱动电流与驱动晶体管的阈值电压没有关系，改善面板的显示均匀性。In the display device provided by the embodiment of the present invention, the compensation subcircuit in the pixel circuit of the display panel can complete the potential reset under the control of the control subcircuit, and store the threshold voltage of the driving transistor, which can be better in driving the transistor. When the light-emitting device emits light, the threshold voltage of the driving transistor is compensated, so that the driving current for driving the light-emitting device to emit light has no relationship with the threshold voltage of the driving transistor, and the display uniformity of the panel is improved.
显然，本领域的技术人员可以对本实用新型进行各种改动和变型而不脱离本实用新型的精神和范围。这样，倘若本实用新型的这些修改和变型属于本实用新型权利要求及其等同技术的范围之内，则本实用新型也意图包含这些改动和变型在内。Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420091784.9UCN203733448U (en) | 2014-02-28 | 2014-02-28 | Pixel circuit, display panel and display device |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420091784.9UCN203733448U (en) | 2014-02-28 | 2014-02-28 | Pixel circuit, display panel and display device |
| Publication Number | Publication Date |
|---|---|
| CN203733448Utrue CN203733448U (en) | 2014-07-23 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420091784.9UExpired - LifetimeCN203733448U (en) | 2014-02-28 | 2014-02-28 | Pixel circuit, display panel and display device |
| Country | Link |
|---|---|
| CN (1) | CN203733448U (en) |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term | Granted publication date:20140723 |