CN113223460B - Pixel circuit, pixel driving method and display device - Google Patents
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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Abstract
Translated fromChinese
Description
Translated fromChinese技术领域technical field
本申请属于电路技术领域，具体涉及一种像素电路、像素驱动方法和显示装置。The present application belongs to the technical field of circuits, and in particular relates to a pixel circuit, a pixel driving method and a display device.
背景技术Background technique
有源矩阵有机发光二极体面板(Active Matrix/Organic Light EmittingDiode，AMOLED)具备高清晰、高亮度、能耗低等优点，被认为是取代液晶显示器的新技术。AMOLED显示装置中配置有多个发光元件(Organic Light-Emitting Diode，OLED)，且每一个OLED器件对应一个像素电路。Active Matrix/Organic Light Emitting Diode (AMOLED) has the advantages of high definition, high brightness and low energy consumption, and is considered to be a new technology to replace liquid crystal displays. A plurality of light-emitting elements (Organic Light-Emitting Diode, OLED) are configured in the AMOLED display device, and each OLED device corresponds to a pixel circuit.
当AMOLED显示装置中的与OLED的阴极连接的电源电压端提供的电压增加时，即OLED器件阴极接入的电压增加时，显示装置的黑态区域对应的像素电路中的晶体管可能产生漏电流，导致OLED器件导通，OLED器件处于微微发亮的状态，其中，黑态区域为显示装置中显示黑色的部分显示区域。这导致显示装置的黑态区域可能存在细微的亮度，进而影响显示装置的显示效果。When the voltage provided by the power supply voltage terminal connected to the cathode of the OLED in the AMOLED display device increases, that is, when the voltage connected to the cathode of the OLED device increases, the transistors in the pixel circuit corresponding to the black state area of the display device may generate leakage current, As a result, the OLED device is turned on, and the OLED device is in a slightly bright state, wherein the black state area is a part of the display area that displays black in the display device. As a result, there may be slight brightness in the black state area of the display device, which in turn affects the display effect of the display device.
发明内容SUMMARY OF THE INVENTION
本申请实施例的目的是提供一种像素电路、像素驱动方法和显示装置，能够解决现有的显示装置显示效果不佳的技术问题。The purpose of the embodiments of the present application is to provide a pixel circuit, a pixel driving method and a display device, which can solve the technical problem of poor display effect of the existing display device.
为了解决上述技术问题，本申请是这样实现的：In order to solve the above technical problems, this application is implemented as follows:
第一方面，本申请实施例提供了一种像素电路，包括发光元件、第一开关管、第二开关管和电压控制电路；In a first aspect, an embodiment of the present application provides a pixel circuit, including a light-emitting element, a first switch tube, a second switch tube, and a voltage control circuit;
所述第一开关管用于在其控制端的电位的控制下，控制第一驱动节点与第二驱动节点之间连通或断开；The first switch tube is used to control the connection or disconnection between the first driving node and the second driving node under the control of the potential of the control terminal;
相互串联的所述第二开关管和所述电压控制电路设置于所述第二驱动节点和所述发光元件之间；The second switch tube and the voltage control circuit connected in series are arranged between the second driving node and the light-emitting element;
所述电压控制电路用于当所述第一驱动节点接入第一电压信号，所述第二开关管控制所述第二驱动节点与所述发光元件之间连通，并且所述第一开关管控制所述第一驱动节点和所述第二驱动节点之间断开时，控制降低所述第二驱动节点的电压。The voltage control circuit is used for when the first drive node is connected to a first voltage signal, the second switch tube controls the connection between the second drive node and the light-emitting element, and the first switch tube When the disconnection between the first driving node and the second driving node is controlled, the voltage of the second driving node is controlled to decrease.
第二方面，本申请实施例提供了一种像素驱动方法，应用于如第一方面所述的像素电路，所述方法包括：In a second aspect, an embodiment of the present application provides a pixel driving method, which is applied to the pixel circuit according to the first aspect, and the method includes:
在第一驱动节点接入第一电压信号，第二驱动节点与发光元件之间连通，并且所述第一驱动节点与所述第二驱动节点之间断开的情况下，降低所述第二驱动节点的电压。When the first driving node is connected to the first voltage signal, the second driving node is connected to the light-emitting element, and the first driving node is disconnected from the second driving node, the second driving node is reduced node voltage.
第三方面，本申请实施例提供了一种显示装置，包括如第一方面所述的像素电路。In a third aspect, an embodiment of the present application provides a display device, including the pixel circuit described in the first aspect.
本申请实施例中，相互串联的第二开关管和电压控制电路设置于第二驱动节点和发光元件之间，电压控制电路用于当第一驱动节点接入第一电压信号，第二开关管控制第二驱动节点与发光元件之间连通，并且第一开关管控制第一驱动节点和第二驱动节点之间断开时，控制降低第二驱动节点的电压，避免第一开关管产生漏电流，使得发光元件导通发光。本申请实施例通过降低显示装置黑态区域对应的像素电路中第二驱动节点的电压，避免第一开关管产生漏电流，控制像素电路中的发光元件处于截止状态，这样，显示装置的黑态区域不存在细微的亮度，进而提高了显示装置的显示效果。In the embodiment of the present application, the second switch tube and the voltage control circuit connected in series are arranged between the second drive node and the light-emitting element, and the voltage control circuit is used for when the first drive node is connected to the first voltage signal, the second switch tube When the connection between the second driving node and the light-emitting element is controlled, and when the first switching tube controls the disconnection between the first driving node and the second driving node, the voltage of the second driving node is controlled to decrease, so as to avoid the leakage current of the first switching tube. The light-emitting element is turned on to emit light. In the embodiment of the present application, by reducing the voltage of the second driving node in the pixel circuit corresponding to the black state area of the display device, the leakage current generated by the first switch tube is avoided, and the light-emitting element in the pixel circuit is controlled to be in the off state. In this way, the black state of the display device is There is no subtle brightness in the area, thereby improving the display effect of the display device.
附图说明Description of drawings
图1是本申请实施例提供的像素电路的电路图之一；FIG. 1 is one of circuit diagrams of a pixel circuit provided by an embodiment of the present application;
图2是本申请实施例提供的像素电路的电路图之二；FIG. 2 is the second circuit diagram of the pixel circuit provided by the embodiment of the present application;
图3是本申请实施例提供的像素驱动方法的流程图。FIG. 3 is a flowchart of a pixel driving method provided by an embodiment of the present application.
具体实施方式Detailed ways
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.
本申请的说明书和权利要求书中的术语“第一”、“第二”等是用于区别类似的对象，而不用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施。此外，说明书以及权利要求中“和/或”表示所连接对象的至少其中之一，字符“/”，一般表示前后关联对象是一种“或”的关系。The terms "first", "second" and the like in the description and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that embodiments of the application can be practiced in sequences other than those illustrated or described herein. In addition, "and/or" in the description and claims indicates at least one of the connected objects, and the character "/" generally indicates that the associated objects are in an "or" relationship.
请参阅图1，图1是本申请实施例提供的像素电路的电路图之一。如图1所示，本申请实施例提供的像素电路包括发光元件D1、第一开关管T1、第二开关管T2和电压控制电路10；Please refer to FIG. 1 . FIG. 1 is one of circuit diagrams of a pixel circuit provided by an embodiment of the present application. As shown in FIG. 1 , the pixel circuit provided by the embodiment of the present application includes a light-emitting element D1, a first switch transistor T1, a second switch transistor T2, and a
所述第一开关管T1用于在其控制端的电位的控制下，控制第一驱动节点A1与第二驱动节点A2之间连通或断开；The first switch tube T1 is used to control the connection or disconnection between the first driving node A1 and the second driving node A2 under the control of the potential of its control terminal;
相互串联的所述第二开关管T2和所述电压控制电路10设置于所述第二驱动节点A2和所述发光元件D1之间；The second switch transistor T2 and the
所述电压控制电路10用于当所述第一驱动节点A1接入第一电压信号，所述第二开关管T2控制所述第二驱动节点A2与所述发光元件D1之间连通，并且所述第一开关管T1控制所述第一驱动节点A1和所述第二驱动节点A2之间断开时，控制降低所述第二驱动节点A2的电压。The
本实施例中，第一开关管T1设置在第一驱动节点A1和第二驱动节点A2之间，第二开关管T2和电压控制电路10设置在第二驱动节点A2和发光元件D1之间，且第二开关管T2和电压控制电路10相互串联。In this embodiment, the first switch transistor T1 is arranged between the first drive node A1 and the second drive node A2, the second switch transistor T2 and the
第一驱动节点A1第二驱动节点A2当第一开关管T1处于截止状态时，表示像素电路处于不发光状态，控制第一驱动节点A1与第二驱动节点A2之间断开，发光元件D1中无电流通过，使得发光元件D1截止。The first driving node A1 and the second driving node A2 When the first switch tube T1 is in the off state, it indicates that the pixel circuit is in a non-emitting state, and the first driving node A1 and the second driving node A2 are controlled to be disconnected, and there is no light-emitting element D1. A current flows, so that the light-emitting element D1 is turned off.
当第二开关管T2处于导通状态时，第二驱动节点A2与发光元件D1之间导通；当第二开关管T2处于截止状态时，第二驱动节点A2与发光元件D1之间断开。When the second switch transistor T2 is in an on state, the second drive node A2 is connected with the light emitting element D1; when the second switch transistor T2 is in an off state, the second drive node A2 and the light emitting element D1 are disconnected.
本实施例中，当第一驱动节点A1接入第一电压信号，第二开关管T2控制第二驱动节点A2与发光元件D1之间连通，且第一开关管T1控制第一驱动节点A1与第二驱动节点A2之间断开时，分压控制电路降低第二驱动节点A2的电压，避免第一开关管T1产生漏电流导通发光元件D1，通过降低显示装置黑态区域对应的像素电路中第二驱动节点A2的电压，控制像素电路中的发光元件D1处于截止状态，这样，显示装置的黑态区域不存在细微的亮度，进而提高了显示装置的显示效果。In this embodiment, when the first driving node A1 is connected to the first voltage signal, the second switching transistor T2 controls the communication between the second driving node A2 and the light-emitting element D1, and the first switching transistor T1 controls the first driving node A1 and the light-emitting element D1. When the second driving node A2 is disconnected, the voltage divider control circuit reduces the voltage of the second driving node A2 to prevent the first switch tube T1 from generating leakage current to turn on the light-emitting element D1. By reducing the voltage in the pixel circuit corresponding to the black region of the display device The voltage of the second driving node A2 controls the light emitting element D1 in the pixel circuit to be in an off state, so that there is no subtle brightness in the black state area of the display device, thereby improving the display effect of the display device.
可选地，所述第二开关管T2分别与发光控制线EM、所述第二驱动节点A2和发光控制节点A3电连接，用于在所述发光控制线EM提供的发光控制信号的控制下，控制所述第二驱动节点A2与所述发光控制节点A3之间连通或断开；Optionally, the second switch tube T2 is electrically connected to the light-emitting control line EM, the second driving node A2 and the light-emitting control node A3 respectively, and is used under the control of the light-emitting control signal provided by the light-emitting control line EM. , controlling the connection or disconnection between the second driving node A2 and the light-emitting control node A3;
所述电压控制电路10分别与所述发光控制节点A3和所述发光元件D1电连接，还用于在所述第一开关管T1控制所述第一驱动节点A1与所述第二驱动节点A2之间连通时，控制所述发光控制节点A3和所述发光元件D1之间连通。The
可选地，发光元件D1为发光二极管，第一开关管T1包括第一晶体管，第二开关管T2包括第二晶体管，电压控制电路10包括相互并联的电阻电路11和开关管12。且第一晶体管和第二晶体管均为p型晶体管。Optionally, the light-emitting element D1 is a light-emitting diode, the first switch tube T1 includes a first transistor, the second switch tube T2 includes a second transistor, and the
在其他实施例中，第一开关管T1和第二开关管T2可以是除晶体管之外的其他类型的开关管，例如MOS管。In other embodiments, the first switch transistor T1 and the second switch transistor T2 may be other types of switch transistors other than transistors, such as MOS transistors.
如图1所示，第二开关管T2设置在第二驱动节点A2和发光控制节点A3之间。电压控制电路10设置在发光控制节点A3和发光元件D1之间。其中，发光控制节点A3设置于第二开关管T2和分压电路之间。As shown in FIG. 1 , the second switch tube T2 is disposed between the second driving node A2 and the light-emitting control node A3. The
在第二开关管T2包括第二晶体管的情况下，第二晶体管的控制极与发光控制线EM电连接，第二晶体管的第一极与第二驱动节点A2电连接，第二晶体管的第二极与发光控制节点A3电连接。In the case where the second switch tube T2 includes a second transistor, the control electrode of the second transistor is electrically connected to the light-emitting control line EM, the first electrode of the second transistor is electrically connected to the second driving node A2, and the second electrode of the second transistor is electrically connected to the second driving node A2. The pole is electrically connected to the light-emitting control node A3.
发光控制线EM用于提供发光控制信号，发光控制信号是像素电路的发光开关控制信号，是一种脉冲信号。第二晶体管在发光控制信号的控制下，处于导通状态或截止状态。当第二晶体管处于导通状态时，第二驱动节点A2与发光控制节点A3之间连通；当第二晶体管处于截止状态时，第二驱动节点A2与发光控制节点A3之间断开。The light-emitting control line EM is used to provide a light-emitting control signal, and the light-emitting control signal is a light-emitting switch control signal of the pixel circuit, which is a pulse signal. The second transistor is in an on state or an off state under the control of the light-emitting control signal. When the second transistor is in an on state, the second driving node A2 and the light emitting control node A3 are connected; when the second transistor is in an off state, the second driving node A2 and the light emitting control node A3 are disconnected.
如图1所示，电阻电路11包括一个电阻，应理解，在其他实施例中，上述电阻电路11可以包括多个电阻，或者包括等同于电阻的元器件。As shown in FIG. 1 , the
如图1所示，开关管12可以是晶体管，该开关管12的控制极与第一晶体管的控制极电连接，这样，在第一晶体管处于导通状态时，开关管12也处于导通状态，控制发光控制节点A3和发光元件D1之间连通。As shown in FIG. 1 , the
可选地，所述第二开关管T2分别与发光控制线EM、所述第二驱动节点A2和发光控制节点A3电连接，用于在所述发光控制线EM提供的发光控制信号的控制下，控制所述第二驱动节点A2与所述发光控制节点A3之间连通或断开；Optionally, the second switch tube T2 is electrically connected to the light-emitting control line EM, the second driving node A2 and the light-emitting control node A3 respectively, and is used under the control of the light-emitting control signal provided by the light-emitting control line EM. , controlling the connection or disconnection between the second driving node A2 and the light-emitting control node A3;
所述电压控制电路10分别与所述发光控制节点A3和所述发光元件D1电连接，还用于在所述第一开关管T1控制所述第一驱动节点A1与所述第二驱动节点A2之间连通时，控制所述发光控制节点A3和所述发光元件D1之间连通。The
如图2所示，电压控制电路10设置在第二驱动节点A2和发光控制节点A3之间，第二开关管T2设置在发光控制节点A3和发光元件D1之间。As shown in FIG. 2 , the
如上所述，第二开关管T2包括第二晶体管。在图2示出的电路结构中，第二晶体管的第一极与发光控制节点A3电连接，第二晶体管的第二极与发光元件D1的第一极电连接，第二晶体管的控制极与发光控制线EM连接。As mentioned above, the second switch tube T2 includes a second transistor. In the circuit structure shown in FIG. 2 , the first electrode of the second transistor is electrically connected to the light-emitting control node A3, the second electrode of the second transistor is electrically connected to the first electrode of the light-emitting element D1, and the control electrode of the second transistor is electrically connected to the light-emitting control node A3. The luminous control line EM is connected.
本实施例中第二开关管T2和电压控制电路10的工作原理与上述实施例中提及的第二开关管T2和电压控制电路10的工作原理一致，在此不做重复阐述。The working principles of the second switch transistor T2 and the
可选地，所述像素电路还包括第三开关管T3，所述第三开关管T3分别与第一电压端ELVDD、发光控制线EM和所述第一驱动节点A1电连接，用于在所述发光控制线EM提供的发光控制信号的控制下，控制所述第一电压端ELVDD与所述第一驱动节点A1之间连通或断开；Optionally, the pixel circuit further includes a third switch transistor T3, and the third switch transistor T3 is electrically connected to the first voltage terminal ELVDD, the light-emitting control line EM, and the first drive node A1, respectively, and is used for Controlling the connection or disconnection between the first voltage terminal ELVDD and the first driving node A1 under the control of the light-emitting control signal provided by the light-emitting control line EM;
所述第一电压端ELVDD用于提供所述第一电压信号。The first voltage terminal ELVDD is used for providing the first voltage signal.
请参阅图1或图2，像素电路还包括第三开关管T3，第三开关管T3设置在第一电压端ELVDD和第一驱动节点A1之间，其中，第一电压端ELVDD提供约为4.6V的高电位电压。Please refer to FIG. 1 or FIG. 2 , the pixel circuit further includes a third switch transistor T3, which is disposed between the first voltage terminal ELVDD and the first driving node A1, wherein the first voltage terminal ELVDD provides about 4.6 The high potential voltage of V.
如图1或图2所示，发光元件D1的第二极连接第二电压端ELVSS，其中，第二电压端ELVSS提供-3v至-3.5v之间的低电位电压。As shown in FIG. 1 or FIG. 2 , the second electrode of the light-emitting element D1 is connected to the second voltage terminal ELVSS, wherein the second voltage terminal ELVSS provides a low potential voltage between -3v and -3.5v.
第三开关管T3在发光控制线EM提供的发光控制信号的控制下，控制第一电压端ELVDD与第一驱动节点A1之间连通或断开。第一电压端ELVDD第一驱动节点A1第一电压端ELVDD第一驱动节点A1The third switch transistor T3 controls the connection or disconnection between the first voltage terminal ELVDD and the first driving node A1 under the control of the light-emitting control signal provided by the light-emitting control line EM. The first voltage terminal ELVDD The first driving node A1 The first voltage terminal ELVDD The first driving node A1
当第一开关管T1处于导通状态、第二开关管处于导通状态，且第三开关管处于导通状态时，表示像素电路处于发光状态，第一开关管T1控制第一驱动节点A1与第二驱动节点A2之间导通，第一电压信号产生的电流通过发光元件D1，使得发光元件D1发光。When the first switch transistor T1 is in the conducting state, the second switch transistor is in the conducting state, and the third switch transistor is in the conducting state, it means that the pixel circuit is in the light-emitting state, and the first switch transistor T1 controls the first driving node A1 and the The second driving nodes A2 are turned on, and the current generated by the first voltage signal passes through the light-emitting element D1, so that the light-emitting element D1 emits light.
可选地，所述第三开关管T3包括第三晶体管，所述第三晶体管的控制极与所述发光控制线EM电连接，所述第三晶体管的第一极与所述第一电压端ELVDD电连接，所述第三晶体管的第二极与所述第一开关管T1电连接。Optionally, the third switch tube T3 includes a third transistor, a control electrode of the third transistor is electrically connected to the light-emitting control line EM, and a first electrode of the third transistor is connected to the first voltage terminal ELVDD is electrically connected, and the second pole of the third transistor is electrically connected to the first switch transistor T1.
如图1或图2所示，第三开关管T3包括第三晶体管，第三晶体管在发光控制线EM提供的发光控制信号的控制下，处于导通状态或截止状态。当第三晶体管处于导通状态时，第一驱动节点A1与第一电压端ELVDD之间连通；当第二晶体管处于截止状态时，第二驱动节点A2与发光控制节点A3之间断开。其中，第三晶体管为p型晶体管。As shown in FIG. 1 or FIG. 2 , the third switch tube T3 includes a third transistor, and the third transistor is in an on state or an off state under the control of the light emitting control signal provided by the light emitting control line EM. When the third transistor is in an on state, the first driving node A1 is connected with the first voltage terminal ELVDD; when the second transistor is in an off state, the second driving node A2 and the light emitting control node A3 are disconnected. The third transistor is a p-type transistor.
可选地，所述像素电路还包括数据电压写入电路20、第一初始化电路40、补偿控制电路30、第二初始化电路50和储能电路60；Optionally, the pixel circuit further includes a data
所述数据电压写入电路20用于在扫描线Scan(n)提供的扫描信号的控制下，控制将数据电压写入所述第一驱动节点A1；The data
所述第一初始化电路40用于在初始化控制线Scan(n-1)提供的初始化控制信号的控制下，控制将初始电压提供至所述第一开关管T1；The
所述补偿控制电路30用于在所述扫描线Scan(n)提供的扫描信号的控制下，控制所述第一开关管T1与所述第二驱动节点A2之间连通或断开；The
所述第二初始化电路50用于在所述扫描线Scan(n)提供的扫描信号的控制下，将所述初始电压提供至所述发光元件D1；The
所述储能电路60的第一端与第一电压端ELVDD电连接，所述储能电路60的第二端设置于所述补偿控制电路30的第一极和所述第一开关管T1的控制端之间，所述储能电路60用于储存电能。The first end of the
可选地，所述数据电压写入电路20包括第四晶体管T4，所述补偿控制电路30包括第五晶体管T5，所述第一初始化电路40包括第六晶体管T6，所述第二初始化电路50包括第七晶体管T7，所述储能电路60包括电容C；Optionally, the data
所述第四晶体管T4的第一极连接数据电压Data，所述第四晶体管T4的第二极与所述第一驱动节点A1电连接；所述第五晶体管T5的第一极与所述第一开关管T1的控制端电连接，所述第五晶体管T5的第二极与所述第二驱动节点A2电连接；所述第六晶体管T6的第一极与初始电压端Vi电连接，所述第六晶体管T6的第二极与所述第五晶体管T5的第一极电连接；所述第七晶体管T7的第一极与所述第六晶体管T6的第一极电连接，所述第七晶体管T7的第二极与所述发光元件D1电连接。The first electrode of the fourth transistor T4 is connected to the data voltage Data, the second electrode of the fourth transistor T4 is electrically connected to the first driving node A1, and the first electrode of the fifth transistor T5 is connected to the first drive node A1. The control terminal of a switch tube T1 is electrically connected, the second pole of the fifth transistor T5 is electrically connected to the second driving node A2; the first pole of the sixth transistor T6 is electrically connected to the initial voltage terminal Vi, so The second pole of the sixth transistor T6 is electrically connected to the first pole of the fifth transistor T5; the first pole of the seventh transistor T7 is electrically connected to the first pole of the sixth transistor T6, and the first pole of the seventh transistor T7 is electrically connected to the first pole of the sixth transistor T6. The second pole of the seven transistor T7 is electrically connected to the light-emitting element D1.
请参阅图1，像素电路还包括数据电压写入电路20、第一初始化电路40、补偿控制电路30、第二初始化电路50和储能电路60。Referring to FIG. 1 , the pixel circuit further includes a data
应理解，在其他实施例中，上述电压写入电路20、第一初始化电路40、补偿控制电路30和第二初始化电路50也可以是除晶体管之外的其他类型的开关管，例如MOS管。It should be understood that, in other embodiments, the
如图1所示，数据电压写入电路20包括第四晶体管T4，第四晶体管T4的控制极与扫描线Scan(n)电连接，第四晶体管T4的第一极连接数据电压Data，其中，数据电压Data用于提供数据电压信号。应理解，当第二开关管T2在扫描线Scan(n)提供的扫描信号的控制下处于导通状态时，将数据电压写入第一驱动信号。As shown in FIG. 1 , the data
如图1所示，补偿控制电路30包括第五晶体管T5，第五晶体管T5的控制极与扫描线Scan(n)电连接，第五晶体管T5的第一极与第一开关管T1的控制端电连接，第五晶体管T5的第二极与第二驱动节点A2电连接。当第五晶体管T5在扫描线Scan(n)提供的扫描信号的控制下处于导通状态时，控制第一开关管T1与第二驱动节点A2之间连通；当第五晶体管T5在扫描线Scan(n)提供的扫描信号的控制下处于截止状态时，控制第一开关管T1与第二驱动节点A2之间断开。As shown in FIG. 1 , the
如图1所示，第一初始化电路40包括第六晶体管T6，第六晶体管T6的控制极与初始化控制线Scan(n-1)电连接，第六晶体管T6的第一极与初始电压端Vi电连接，其中，初始化控制线Scan(n-1)用于提供初始化控制信号，初始电压为负电压。当第六晶体管T6在初始化控制线Scan(n-1)提供的初始化控制信号的控制下处于导通状态时，将初始电压提供至第一开关管T1。As shown in FIG. 1 , the
如图1所示，第二初始化电路50包括第七晶体管T7，第七晶体管T7的控制极与扫描线Scan(n)电连接，第七晶体管T7的第一极与初始电压端Vi电连接，第七晶体管T7的第二极与发光元件D1的第一极电连接。当第七晶体管T7在扫描线Scan(n)提供的扫描信号的控制下处于导通状态时，将初始电压提供至发光元件D1的第一极。As shown in FIG. 1, the
本发明所有实施例中采用的二极管均为发光二极管，所述发光元件D1的第一极可以为发光二极管的阳极，所述发光元件D1的第二极可以为发光二极管的阴极。The diodes used in all the embodiments of the present invention are light emitting diodes, the first pole of the light emitting element D1 may be the anode of the light emitting diode, and the second pole of the light emitting element D1 may be the cathode of the light emitting diode.
本发明所有实施例中采用的晶体管均可以为三极管、薄膜晶体管或场效应管或其他特性相同的器件。在本发明实施例中，为区分晶体管除控制极之外的两极，将其中一极称为第一极，另一极称为第二极。The transistors used in all embodiments of the present invention may be triodes, thin film transistors, field effect transistors, or other devices with the same characteristics. In the embodiment of the present invention, in order to distinguish the two poles of the transistor except the control pole, one pole is called the first pole, and the other pole is called the second pole.
在实际操作时，当所述晶体管为三极管时，所述控制极可以为基极，所述第一极可以为集电极，所述第二极可以发射极。In actual operation, when the transistor is a triode, the control electrode may be a base electrode, the first electrode may be a collector electrode, and the second electrode may be an emitter electrode.
在实际操作时，当所述晶体管为薄膜晶体管或场效应管时，所述控制极可以为栅极，所述第一极可以为源极，所述第二极可以为漏极。In actual operation, when the transistor is a thin film transistor or a field effect transistor, the control electrode may be a gate electrode, the first electrode may be a source electrode, and the second electrode may be a drain electrode.
应理解，上述像素电路包括以下三种工作状态：It should be understood that the above pixel circuit includes the following three working states:
在第一工作状态下，第六晶体管T6在初始化控制线Scan(n-1)传输的初始化控制信号的控制下导通，第六晶体管T6将初始电压提供至第一开关管T1，使得第一开关管T1导通，并复位电容C。In the first working state, the sixth transistor T6 is turned on under the control of the initialization control signal transmitted by the initialization control line Scan(n-1), and the sixth transistor T6 provides the initial voltage to the first switch tube T1, so that the first The switch tube T1 is turned on, and the capacitor C is reset.
在第二工作状态下，第四晶体管T4、第五晶体管T5和第七晶体管T7在扫描线Scan(n)提供的扫描信号的控制下导通，数据电压通过第四晶体管T4、第一驱动节点A1、第一晶体管和第五晶体管T5传输至电容C，对电容C进行储能，电容C对应的电压为数据电压。In the second working state, the fourth transistor T4, the fifth transistor T5 and the seventh transistor T7 are turned on under the control of the scan signal provided by the scan line Scan(n), and the data voltage passes through the fourth transistor T4, the first driving node A1, the first transistor and the fifth transistor T5 are transmitted to the capacitor C to store energy in the capacitor C, and the voltage corresponding to the capacitor C is the data voltage.
在第三工作状态下，第二开关管T2和第三晶体管在发光控制线EM提供的发光控制信号的控制下导通，第一开关管T1在电容C提供的数据电压的作用下，处于导通状态，将第一电压端ELVDD与发光二极管的阳极连通，启动发光二极管工作。In the third working state, the second switch tube T2 and the third transistor are turned on under the control of the light-emitting control signal provided by the light-emitting control line EM, and the first switch tube T1 is turned on under the action of the data voltage provided by the capacitor C. In the on state, the first voltage terminal ELVDD is connected to the anode of the light emitting diode, and the light emitting diode is started to work.
容易理解的是，当第二开关管T2和第三晶体管处于导通状态时，第一开关管T1也可以在电容C提供的数据电压的作用下，处于截止状态，这种情况下，电压控制电路10降低第二驱动节点A2的电压，避免第一开关管T1产生漏电流导通发光元件D1，进而确保像素电路的发光二极管不会产生细微的光亮。It is easy to understand that when the second switch transistor T2 and the third transistor are in an on state, the first switch transistor T1 can also be in an off state under the action of the data voltage provided by the capacitor C. In this case, the voltage control The
其中，上述第一工作状态可以称为复位状态，第二工作状态可以称为补偿状态，第三工作状态可以称为发光状态。The above-mentioned first working state may be called a reset state, the second working state may be called a compensation state, and the third working state may be called a light-emitting state.
请参阅图3，图3是本申请实施例提供的像素驱动方法的流程图。本申请实施例中，还提供一种像素驱动方法，该像素驱动方法应用于上述实施例提供的像素电路，本申请实施例提供的像素驱动方法包括以下步骤：Please refer to FIG. 3 , which is a flowchart of a pixel driving method provided by an embodiment of the present application. In the embodiment of the present application, a pixel driving method is also provided, and the pixel driving method is applied to the pixel circuit provided by the above embodiment. The pixel driving method provided by the embodiment of the present application includes the following steps:
S101，在第一驱动节点接入第一电压信号，第二驱动节点与发光元件之间连通，并且所述第一驱动节点与所述第二驱动节点之间断开的情况下，降低所述第二驱动节点的电压。S101 , in the case that a first driving node is connected to a first voltage signal, a second driving node is connected to the light-emitting element, and the first driving node is disconnected from the second driving node, lower the first driving node 2 The voltage of the drive node.
本实施例中，如上所述，像素电路包括第一开关管、第二开关管和电压控制电路。In this embodiment, as described above, the pixel circuit includes a first switch transistor, a second switch transistor and a voltage control circuit.
当第二开关管在扫描线提供的扫描信号的控制下导通时，控制第二驱动节点与发光元件之间连通。When the second switch tube is turned on under the control of the scan signal provided by the scan line, the connection between the second drive node and the light-emitting element is controlled.
当第一开关管在其控制端的电位的控制下处于截止状态时，表示像素电路中的发光元件处于不发光状态，则控制第一驱动节点与第二驱动节点之间断开，防止电流通过发光元件。When the first switch tube is in an off state under the control of the potential of its control terminal, it means that the light-emitting element in the pixel circuit is in a non-emitting state, and the first driving node and the second driving node are controlled to be disconnected to prevent current from passing through the light-emitting element. .
在第一驱动节点接入第一电压信号，第二开关管控制第二驱动节点与发光元件之间连通，且第一开关管控制第一驱动节点与第二驱动节点之间断开的情况下，电压控制电路控制降低第二驱动节点的电压，避免第一开关管产生漏电流而导致发光元件发光，进而提高显示装置的显示效果。When the first drive node is connected to the first voltage signal, the second switch tube controls the connection between the second drive node and the light-emitting element, and the first switch tube controls the disconnection between the first drive node and the second drive node, The voltage control circuit controls and reduces the voltage of the second driving node, so as to prevent the first switch tube from generating leakage current and causing the light-emitting element to emit light, thereby improving the display effect of the display device.
需要说明的是，本申请实施例提供的像素驱动方法应用于包括如图1至图2所示实施例中的像素电路，且本申请实施例提供的像素驱动方法，具有与本申请实施例提供的像素电路相同的有益效果，为避免重复，在此不再赘述。It should be noted that the pixel driving method provided by the embodiment of the present application is applied to the pixel circuit including the embodiments shown in FIG. 1 to FIG. 2 , and the pixel driving method provided by the embodiment of the present application has the same characteristics as that provided by the embodiment of the present application. The beneficial effects of the same pixel circuit are not repeated here in order to avoid repetition.
本申请实施例中，还提供一种显示装置，该显示装置包括上述实施例提供的像素电路，且能应用上述实施例提供的像素驱动方法。其中，显示电路的具体实施方式可以参照上述说明，并能够达到相同的技术效果，为避免重复，对此不作赘述。In the embodiment of the present application, a display device is also provided, the display device includes the pixel circuit provided in the above-mentioned embodiment, and can apply the pixel driving method provided in the above-mentioned embodiment. The specific implementation of the display circuit can refer to the above description, and can achieve the same technical effect.
本发明实施例中，上述电子设备可为计算机(Computer)、手机、平板电脑(TabletPersonal Computer)、膝上型电脑(Laptop Computer)、个人数字助理(personal digitalassistant，简称PDA)、移动上网电子设备(Mobile Internet Device，MID)、可穿戴式设备(Wearable Device)、电子阅读器、导航仪、数码相机等。In the embodiment of the present invention, the above-mentioned electronic device may be a computer (Computer), a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a personal digital assistant (personal digital assistant, referred to as PDA), a mobile Internet access electronic device ( Mobile Internet Device, MID), wearable device (Wearable Device), e-reader, navigator, digital camera, etc.
上面结合附图对本申请的实施例进行了描述，但是本申请并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式，均属于本申请的保护之内。The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the inspiration of this application, without departing from the scope of protection of the purpose of this application and the claims, many forms can be made, which all fall within the protection of this application.
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| CN112652270B (en)* | 2020-12-28 | 2021-11-23 | 武汉天马微电子有限公司 | Pixel circuit, display panel and display device |
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