技术领域technical field
本发明涉及显示技术领域，更具体地是涉及一种AMOLED显示像素点驱动电路及其驱动方法。The present invention relates to the field of display technology, and more particularly relates to an AMOLED display pixel point driving circuit and a driving method thereof.
背景技术Background technique
有机发光二极管（Organic Light-Emitting Diode，简称：OLED）显示有繁荣的前景，相比于液晶显示，OLED显示具有自发光、可视角度大、响应速度快、重量轻、厚度薄、结构简单、成本低的特性。Organic light-emitting diode (Organic Light-Emitting Diode, referred to as: OLED) display has a prosperous prospect. Compared with liquid crystal display, OLED display has self-illumination, large viewing angle, fast response speed, light weight, thin thickness, simple structure, Low cost feature.
OLED显示像素点驱动方式有两种：无源有机发光二极管阵列（Passive MatrixOrganic Light Emitting Diode 简称：PMOLED）和有源有机发光二极管阵列（ActiveMatrix Organic Light Emitting Diode 简称：AMOLED）。AMOLED相比PMOLED有如下优点：驱动电流小、整个周期发光、寿命长，所以AMOLED更适合高分辨率、高刷新频率和大尺寸屏幕的显示驱动。There are two ways to drive OLED display pixels: Passive Matrix Organic Light Emitting Diode (PMOLED for short) and Active Matrix Organic Light Emitting Diode (AMOLED for short). Compared with PMOLED, AMOLED has the following advantages: small driving current, full cycle light emission, and long life, so AMOLED is more suitable for display driving with high resolution, high refresh rate and large-size screen.
OLED属于电流驱动型器件，如图1所示，传统AMOLED驱动电路是由两个晶体管和一个电容构成（简称2T1C结构）。可以通过数据写入周期内数据输入电压信号VDATA，在数据保持周期内得到持续恒定电流IOLED来实现OLED驱动，该结构不能补偿TFT和OLED特性偏移问题，灰度不均匀性很高，因此需要补偿。OLED is a current-driven device. As shown in Figure 1, the traditional AMOLED drive circuit is composed of two transistors and a capacitor (referred to as 2T1C structure). The OLED can be driven by the data input voltage signal VDATA in the data writing period and the continuous constant current IOLED in the data holding period. This structure cannot compensate for the deviation of TFT and OLED characteristics, and the gray level is very non-uniform. Hence the need for compensation.
目前，补偿技术主要分为两种：电压型补偿和电流型补偿。电压型补偿通用做法是通过开关晶体管状态转换，让驱动电容储存晶体管阈值电压相关量和驱动电压叠加，以消除晶体管阈值电压的影响，其数据输入信号为电压信号。电流型补偿分别为电流镜补偿和非电流镜补偿，其数据输入信号为电流信号，通用做法是使流过OLED显示像素点的电流IOLED和数据输入电流信号相等。电流型晶体管特性偏移补偿效果优于电压型补偿，其缺点是驱动电容充电时间过长，增大电路的响应时间。在此基础上，Ashtiani和Arokia Nathan在“A driving scheme for active-matrix organic light-emitting diode displaysbased on feedback[J]. Display Technology，Journal of，2006，2(3)：258-264.”中提出了新型像素点外反馈补偿电路,如图2所示,该像素点内电路通过像素点外电路输入数据电压信号，像素点内电路电流通过反馈调节，提供给驱动电容合适的驱动电压，能够补偿晶体管特性偏移，但其缺点是响应时间太长。Liu W和Yao G等在“Liu W，Yao G，Jiang C，et al.A New Voltage Driving Scheme to Suppress Non-Idealities of PolycrystallineThin-Film Transistors for AMOLED Displays[J]. Journal of Display Technology，2014，10(12)： 991-994.”中提出了改进型反馈补偿电路，如图3所示，同样可以补偿晶体管特性偏移影响，但其缺点是不能补偿OLED特性偏移。At present, the compensation technology is mainly divided into two types: voltage type compensation and current type compensation. The general practice of voltage-type compensation is to superimpose the relevant quantity of the threshold voltage of the driving capacitor to store the transistor threshold voltage and the driving voltage through the state transition of the switching transistor, so as to eliminate the influence of the threshold voltage of the transistor, and its data input signal is a voltage signal. The current type compensation is current mirror compensation and non-current mirror compensation respectively, and its data input signal is a current signal. The general practice is to make the current IOLED flowing through the OLED display pixel equal to the data input current signal. Current-type transistor characteristic offset compensation effect is better than voltage-type compensation, and its disadvantage is that the charging time of the driving capacitor is too long, which increases the response time of the circuit. On this basis, Ashtiani and Arokia Nathan proposed in "A driving scheme for active-matrix organic light-emitting diode displays based on feedback [J]. Display Technology, Journal of, 2006, 2(3): 258-264." A new type of external pixel feedback compensation circuit is proposed, as shown in Figure 2, the pixel internal circuit inputs the data voltage signal through the pixel external circuit, and the pixel internal circuit current is regulated by feedback to provide a suitable driving voltage for the driving capacitor, which can compensate The transistor characteristics are shifted, but its disadvantage is that the response time is too long. Liu W and Yao G etc. in "Liu W, Yao G, Jiang C, et al.A New Voltage Driving Scheme to Suppress Non-Idealities of PolycrystallineThin-Film Transistors for AMOLED Displays[J]. Journal of Display Technology, 2014, 10 (12): 991-994." An improved feedback compensation circuit is proposed, as shown in Fig. 3, which can also compensate the influence of the transistor characteristic shift, but its disadvantage is that it cannot compensate the OLED characteristic shift.
发明人发现现有技术中AMOLED显示像素点驱动电路仍有如下问题：The inventor found that the AMOLED display pixel driving circuit still has the following problems in the prior art:
（1）为得到较好的AMOLED显示像素点晶体管阈值补偿特性，电流型补偿优于电压型补偿，但电流型补偿响应时间较长，这不能满足大尺寸屏幕、高分辨率和高刷新频率的响应时间要求；(1) In order to obtain better AMOLED display pixel point transistor threshold compensation characteristics, current type compensation is better than voltage type compensation, but the response time of current type compensation is longer, which cannot meet the requirements of large screen, high resolution and high refresh rate response time requirements;
（2）现有补偿技术集中在AMOLED显示像素点驱动电路晶体管特性偏移补偿，忽略OLED特性偏移补偿，OLED像素点之间工艺误差和OLED像素点随时间退化导致各像素点OLED特性不同；(2) Existing compensation technologies focus on AMOLED display pixel drive circuit transistor characteristic offset compensation, ignoring OLED characteristic offset compensation, process error between OLED pixels and OLED pixel degradation over time lead to different OLED characteristics of each pixel;
（3）现有的AMOLED显示像素点驱动电路的数据输入电压信号 VDATA和输出电流IOLED不是线性关系,不利于灰度调节。(3) The data input voltage signal VDATA and the output current IOLED of the existing AMOLED display pixel point driving circuit are not in a linear relationship, which is not conducive to gray scale adjustment.
发明内容Contents of the invention
本发明为克服上述现有技术中的不足，提供了一种AMOLED显示像素点驱动电路及其驱动方法，可实现AMOLED显示像素点驱动电路较快响应、晶体管特性偏移补偿、OLED特性偏移补偿和线性灰度显示。In order to overcome the deficiencies in the above-mentioned prior art, the present invention provides an AMOLED display pixel point driving circuit and its driving method, which can realize faster response of the AMOLED display pixel point driving circuit, transistor characteristic offset compensation, and OLED characteristic offset compensation and linear gray scale display.
本发明通过以下技术方案来实现上述目的。The present invention achieves the above object through the following technical solutions.
一种AMOLED显示像素点驱动电路，包括两部分:AMOLED像素点内电路和AMOLED像素点外电路；其中AMOLED像素点内电路包括：晶体管T1、晶体管T2、晶体管T3、晶体管T4、晶体管T5、晶体管T6、电容CS和OLED；A kind of AMOLED display pixel point drive circuit, comprises two parts: AMOLED pixel point internal circuit and AMOLED pixel point external circuit; Wherein AMOLED pixel point internal circuit comprises: transistor T1, transistor T2, transistor T3, transistor T4, transistor T5, transistor T6 , capacitance CS and OLED;
其中晶体管T5的栅极和晶体管T6的栅极相连，Wherein the gate of the transistor T5 is connected to the gate of the transistor T6,
晶体管T5的源级和AMOLED像素点外电路的输出端相连，The source of the transistor T5 is connected to the output terminal of the circuit outside the AMOLED pixel point,
晶体管T5的漏极和晶体管T1的栅极相连，The drain of transistor T5 is connected to the gate of transistor T1,
晶体管T6的源级和AMOLED像素点外电路的输入端相连，The source of the transistor T6 is connected to the input terminal of the circuit outside the AMOLED pixel point,
晶体管T6的漏极和晶体管T4的漏极相连，The drain of transistor T6 is connected to the drain of transistor T4,
晶体管T1的栅极和晶体管T2的栅极相连，The gate of transistor T1 is connected to the gate of transistor T2,
晶体管T1的源级和第一电源VDD相连，The source of the transistor T1 is connected to the first power supply VDD ,
晶体管T1的漏极和晶体管T3的源级相连，The drain of transistor T1 is connected to the source of transistor T3,
晶体管T2的源级和第一电源VDD相连，The source of the transistor T2 is connected to the first power supply VDD ,
晶体管T2的漏极和晶体管T4的源级相连，The drain of transistor T2 is connected to the source of transistor T4,
电容CS两端分别连接第一电源VDD和晶体管T1的栅极，The two ends of the capacitor CS are respectively connected to the first power supply VDD and the gate of the transistor T1,
晶体管T3的栅极和晶体管T4的栅极相连，The gate of transistor T3 is connected to the gate of transistor T4,
晶体管T3的栅极和漏极相连，The gate and drain of transistor T3 are connected,
OLED的正极和晶体管T3的漏极相连，The anode of the OLED is connected to the drain of the transistor T3,
OLED的负极和第二电源VSS相连。The cathode of the OLED is connected to the second power supply VSS .
AMOLED像素点外电路通过数据输入电压信号VDATA和镜像电流IFB负反馈作用，提供AMOLED像素点内电路中晶体管T1和晶体管T2的自调节驱动电压VG,从而得到OLED的驱动电流IOLED。The external circuit of the AMOLED pixel point provides the self-regulating driving voltage VG of the transistor T1 and the transistor T2 in the circuit of the AMOLED pixel point through the negative feedback of the data input voltage signal VDATA and the mirror current IFB , thereby obtaining the driving current I OLED of theOLED .
上述的AMOLED像素点外电路包括电流采样模块和积分模块；其中电流采样模块的两个输入端分别连接上述的晶体管T6的源级和数据输入电压信号VDATA，积分模块的输入端连接电流采样模块的输出端，积分模块的输出端和上述的晶体管T5的源级相连。The above-mentioned AMOLED pixel external circuit includes a current sampling module and an integration module; wherein the two input terminals of the current sampling module are respectively connected to the source level of the above-mentioned transistor T6 and the data input voltage signal VDATA , and the input terminal of the integration module is connected to the current sampling module The output terminal of the integrating module is connected to the source stage of the above-mentioned transistor T5.
上述的晶体管均为薄膜晶体管或者场效应晶体管。The aforementioned transistors are thin film transistors or field effect transistors.
一种AMOLED显示像素点驱动电路的驱动方法，包括上述的AMOLED显示像素点驱动电路；A method for driving an AMOLED display pixel point drive circuit, comprising the above-mentioned AMOLED display pixel point drive circuit;
显示数据写入模式期间，晶体管T5和晶体管T6被选通，AMOLED像素点外电路通过数据输入电压信号VDATA和镜像电流IFB负反馈作用，提供AMOLED像素点内电路中的晶体管T1和晶体管T2自调节驱动电压VG，从而得到OLED驱动电流IOLED；During the display data writing mode, the transistor T5 and the transistor T6 are gated, and the circuit outside the AMOLED pixel point uses the data input voltage signal VDATA and the mirror current IFB for negative feedback to provide the transistor T1 and transistor T2 in the circuit inside the AMOLED pixel point Self-regulating the driving voltage VG , thereby obtaining the OLED driving current IOLED ;
显示数据保持模式期间，晶体管T5和晶体管T6被关闭，电容CS没有放电回路，晶体管的驱动电压VG维持不变，OLED的驱动电流IOLED保持不变，像素点灰度不变。During the display data holding mode, the transistor T5 and the transistor T6 are turned off, the capacitorCS has no discharge circuit, the driving voltage VG of the transistor remains unchanged, the driving current IOLED of the OLED remains unchanged, and the gray scale of the pixel remains unchanged.
上述的数据输入电压信号VDATA可以通过数模转换得到。The aforementioned data input voltage signal VDATA can be obtained through digital-to-analog conversion.
上述的晶体管T3和晶体管T4用于保持晶体管T1和晶体管T2的漏极电压相等，晶体管T1和晶体管T2为镜像结构，使流经晶体管T1和晶体管T2的电流相等。The transistor T3 and the transistor T4 mentioned above are used to keep the drain voltages of the transistor T1 and the transistor T2 equal, and the transistor T1 and the transistor T2 have a mirror structure, so that the currents flowing through the transistor T1 and the transistor T2 are equal.
上述驱动电路及驱动方法也适用于其它主动发光显示，例如一种LED显示像素点驱动电路，是将上述的AMOLED像素点内电路中的OLED替换为LED。The above-mentioned driving circuit and driving method are also applicable to other active light-emitting displays, for example, an LED display pixel driving circuit is to replace the OLED in the above-mentioned AMOLED pixel internal circuit with an LED.
本发明与现有技术相比主要具有如下有益效果：实现了对晶体管特性偏移补偿，在此基础上得到了较快的响应时间；实现了对OLED特性偏移补偿；AMOLED显示像素点驱动电路的数据输入电压信号VDATA和输出电流呈线性关系，实现了线性灰度显示。Compared with the prior art, the present invention mainly has the following beneficial effects: the compensation for the transistor characteristic offset is realized, and a faster response time is obtained on this basis; the OLED characteristic offset compensation is realized; the AMOLED display pixel point driving circuit The data input voltage signal VDATA has a linear relationship with the output current, and the linear grayscale display is realized.
附图说明Description of drawings
图1是传统“2T1C结构”的AMOLED显示像素点驱动电路图。Figure 1 is a traditional "2T1C structure" AMOLED display pixel drive circuit diagram.
图2是Ashtiani和Arokia Nathan提出的AMOLED显示像素点驱动电路图。Figure 2 is the AMOLED display pixel drive circuit diagram proposed by Ashtiani and Arokia Nathan.
图3是Liu W和Yao G等提出的AMOLED显示像素点驱动电路图。Fig. 3 is the AMOLED display pixel drive circuit diagram proposed by Liu W and Yao G et al.
图4是本发明实施例中的AMOLED显示像素点驱动电路图。FIG. 4 is a circuit diagram of an AMOLED display pixel driving circuit in an embodiment of the present invention.
图5是本发明实施例中的包括AMOLED像素点外电路图的AMOLED显示像素点驱动电路图。FIG. 5 is a circuit diagram of an AMOLED display pixel drive circuit including an external circuit diagram of an AMOLED pixel point in an embodiment of the present invention.
图6是本发明实施例中驱动方法的信号时序图。FIG. 6 is a signal timing diagram of the driving method in the embodiment of the present invention.
图7是本发明实施例中数据输入电压信号VDATA和输出电流IOLED的线性关系图。FIG. 7 is a linear relationship diagram between the data input voltage signal VDATA and the output current IOLED in the embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图对本发明做进一步说明。附图仅用于示例性说明，不能理解为对本专利的限制。The present invention will be further described below in conjunction with the accompanying drawings. The accompanying drawings are for illustrative purposes only and should not be construed as limiting the patent.
为了更简洁的说明本实施例，附图或说明中某些本领域技术人员公知的、但与本发明创造的主要内容不相关的零部件会有所省略。另外为便于表述，附图中某些零部件会有省略、放大或缩小，但并不代表实际产品的尺寸或全部结构。In order to describe this embodiment more concisely, some components that are known to those skilled in the art but not related to the main content of the invention in the drawings or descriptions will be omitted. In addition, for the convenience of expression, some parts in the drawings will be omitted, enlarged or reduced, but it does not represent the size or overall structure of the actual product.
实施例：Example:
本实施例对AMOLED显示像素点驱动电路作具体说明。This embodiment specifically describes the AMOLED display pixel point driving circuit.
如图4所示，一种AMOLED显示像素点驱动电路，包括两部分:AMOLED像素点内电路和AMOLED像素点外电路。As shown in FIG. 4 , an AMOLED display pixel driving circuit includes two parts: an AMOLED pixel internal circuit and an AMOLED pixel external circuit.
AMOLED像素点内电路包括：第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4、第五晶体管T5、第六晶体管T6、电容CS和OLED。The circuit in the AMOLED pixel includes: a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, a capacitorCS and an OLED.
其中第五晶体管T5的栅极和第六晶体管T6的栅极相连，wherein the gate of the fifth transistor T5 is connected to the gate of the sixth transistor T6,
第五晶体管T5的源级和AMOLED像素点外电路的输出端相连，The source of the fifth transistor T5 is connected to the output terminal of the circuit outside the AMOLED pixel point,
第五晶体管T5的漏极和第一晶体管T1的栅极相连，The drain of the fifth transistor T5 is connected to the gate of the first transistor T1,
第六晶体管T6的源级和AMOLED像素点外电路的输入端相连，The source of the sixth transistor T6 is connected to the input terminal of the circuit outside the AMOLED pixel point,
第六晶体管T6的漏极和第四晶体管T4的漏极相连，The drain of the sixth transistor T6 is connected to the drain of the fourth transistor T4,
第一晶体管T1的栅极和第二晶体管T2的栅极相连，The gate of the first transistor T1 is connected to the gate of the second transistor T2,
第一晶体管T1的源级和第一电源VDD相连，The source of the first transistor T1 is connected to the first power supply VDD ,
第一晶体管T1的漏极和第三晶体管T3的源级相连，The drain of the first transistor T1 is connected to the source of the third transistor T3,
第二晶体管T2的源级和第一电源VDD相连，The source of the second transistor T2 is connected to the first power supply VDD ,
第二晶体管T2的漏极和第四晶体管T4的源级相连，The drain of the second transistor T2 is connected to the source of the fourth transistor T4,
电容CS两端分别连接第一电源VDD和第一晶体管T1的栅极，Both ends of the capacitor CS are respectively connected to the first power supply VDD and the gate of the first transistor T1,
第三晶体管T3的栅极和第四晶体管T4的栅极相连，The gate of the third transistor T3 is connected to the gate of the fourth transistor T4,
第三晶体管T3的栅极和漏极相连，The gate and the drain of the third transistor T3 are connected,
OLED的正极和第三晶体管T3的漏极相连，The anode of the OLED is connected to the drain of the third transistor T3,
OLED的负极和和第二电源VSS相连。The cathode of the OLED is connected to the second power supply VSS .
本实施例中的晶体管均为薄膜晶体管或者场效应晶体管。The transistors in this embodiment are thin film transistors or field effect transistors.
AMOLED像素点外电路通过数据输入电压信号VDATA和镜像电流IFB负反馈作用，提供AMOLED像素点内电路中的晶体管驱动电压。The circuit outside the AMOLED pixel point provides the transistor drive voltage in the circuit inside the AMOLED pixel point through the negative feedback effect of the data input voltage signal VDATA and the mirror current IFB .
如图5所示，本实施例中的AMOLED像素点外电路包括电流采样模块和积分模块；其中电流采样模块的两个输入端分别连接第六晶体管T6的源级和数据输入电压信号VDATA，积分模块的输入端连接电流采样模块的输出端，积分模块的输出端和第五晶体管T5的源级相连。As shown in FIG. 5 , the AMOLED pixel external circuit in this embodiment includes a current sampling module and an integrating module; wherein the two input terminals of the current sampling module are respectively connected to the source level of the sixth transistor T6 and the data input voltage signal VDATA , The input end of the integration module is connected to the output end of the current sampling module, and the output end of the integration module is connected to the source of the fifth transistor T5.
如图6所示，是上述的AMOLED显示像素点驱动电路的驱动方法的信号时序图。As shown in FIG. 6 , it is a signal timing diagram of the driving method of the above-mentioned AMOLED display pixel point driving circuit.
显示数据写入模式期间，行选控制信号VSEL为低电平，第五晶体管T5和第六晶体管T6被选通，由晶体管饱和电流公式：During the display data writing mode, the row selection control signal VSEL is at low level, the fifth transistor T5 and the sixth transistor T6 are gated, and the transistor saturation current formula is:
在同一种工艺下，第一晶体管T1和第二晶体管T2选择相同的沟道宽W和沟道长L，第一晶体管T1的源极和栅极分别和第二晶体管T2的源极和栅极连接在一起，即第一晶体管T1和第二晶体管T2的栅源电压VGS相等，第一晶体管T1和第二晶体管T2的阈值电压VTH相等,所以第一晶体管T1漏极的电流IT1和第二晶体管T2漏极的电流IT2比值可化简为：Under the same process, the first transistor T1 and the second transistor T2 select the same channel width W and channel length L, and the source and gate of the first transistor T1 are respectively the same as the source and gate of the second transistor T2 connected together, that is, the gate-source voltage VGS of the first transistor T1 and the second transistor T2 are equal, and the threshold voltage VTH of the first transistor T1 and the second transistor T2 are equal, so the drain current IT1 of the first transistor T1 and The current IT2 ratio of the drain of the second transistor T2 can be simplified as:
从上式可知，VDS_T1与VDS_T2相等才能保证IT1和IT2相等。为此电路加入第三晶体管T3和第四晶体管T4,在选择第三晶体管T3和第四晶体管T4参数时，要求二者有相同的沟道宽W和沟道长L,从而得出：It can be known from the above formula that only when VDS_T1 and VDS_T2 are equal can IT1 and IT2 be equal. To this end, a third transistor T3 and a fourth transistor T4 are added to the circuit. When selecting the parameters of the third transistor T3 and the fourth transistor T4, the two are required to have the same channel width W and channel length L, thus obtaining:
第三晶体管T3和第四晶体管T4共栅，这就保证了：The third transistor T3 and the fourth transistor T4 have a common gate, which ensures:
上式可推出VD_T1与VD_T2相等，从而：The above formula can be deduced that VD_T1 is equal to VD_T2 , thus:
结合电路图4和上式得：Combining the circuit diagram 4 and the above formula to get:
从而可知，IFB和IOLED是镜像电流关系，且不受沟道长度调制效应影响。It can be seen that IFB and IOLED are in the mirror current relationship and are not affected by the channel length modulation effect.
电流采样模块输出电压VFB为：The output voltage VFB of the current sampling module is:
其中G是运算放大器的增益；where G is the gain of the operational amplifier;
积分模块输出电压VOUT为；The output voltage VOUT of the integrating module is;
其中，VOUT(t1)是VOUT在开始时间t1的值，VOUT(t2)是VOUT在结束时间t2的值；Among them, VOUT (t1 ) is the value of VOUT at the start time t1 , VOUT (t2 ) is the value of VOUT at the end time t2 ;
由上式可知，VOUT对电容CS持续充电，这样控制了第一晶体管T1和第二晶体管T2的栅极电压VG,从而控制反馈电流IFB,反馈电流IFB又影响VOUT的变化。该网络是负反馈系统，反馈电流IFB在负反馈系统稳定状态时：It can be seen from the above formula that VOUT continuously charges the capacitorCS , thus controlling the gate voltage VG of the first transistor T1 and the second transistor T2, thereby controlling the feedback current IFB ,which in turn affects the change of VOUT . The network is a negative feedback system, and the feedback current IFB is in the steady state of the negative feedback system:
由于IOLED和IFB是镜像电流关系，即稳定条件下：Since IOLED and IFB are mirror currents, that is, under stable conditions:
从上式可知，数据输入电压信号VDATA和OLED电流IOLED是线性关系，图7给出了线性图和线性度。It can be seen from the above formula that the data input voltage signal VDATA and the OLED current IOLED are in a linear relationship, and Figure 7 shows the linearity diagram and linearity.
显示数据保持模式期间，行选控制信号VSEL为高电平，第五晶体管T5和第六晶体管T6被关闭，电容CS没有放电回路，第一晶体管T1和第二晶体管T2栅极电压 VG维持不变，从而保持OLED驱动电流IOLED不变，所以OLED在保持模式期间像素点灰度不变。During the display data hold mode, the row selection control signal VSEL is high level, the fifth transistor T5 and the sixth transistor T6 are turned off, the capacitor CS has no discharge loop, the gate voltage VG of the first transistor T1 and the second transistor T2 remain unchanged, so as to keep the OLED driving current IOLED unchanged, so the pixel grayscale of the OLED remains unchanged during the holding mode.
从显示数据写入模式和显示数据保持模式工作过程可知：From the working process of display data write mode and display data hold mode:
（1）在稳定条件下，OLED的驱动电流IOLED仅受数据输入电压信号VDATA和反馈电阻RFB影响，晶体管特性偏移不会对OLED的驱动电流IOLED产生改变，所以该电路能够补偿晶体管特性偏移。AMOLED像素点外电路输出为电压信号VOUT，极大地提高了电容CS充放电时间，因此得到了较快的响应时间；(1) Under stable conditions, the driving current IOLED of the OLED is only affected by the data input voltage signal VDATA and the feedback resistor RFB , and the transistor characteristic deviation will not change the driving current IOLED of the OLED, so the circuit can compensate Transistor characteristic shift. The output of the circuit outside the AMOLED pixel point is a voltage signal VOUT , which greatly improves the charging and discharging time of the capacitor CS , so a faster response time is obtained;
（2）在稳定条件下，OLED的驱动电流IOLED仅受数据输入电压信号VDATA和反馈电阻RFB影响，OLED特性偏移不会对OLED的驱动电流IOLED产生改变，所以该电路能够补偿OLED特性偏移；(2) Under stable conditions, the driving current IOLED of the OLED is only affected by the data input voltage signal VDATA and the feedback resistor RFB , and the OLED characteristic deviation will not change the driving current IOLED of the OLED, so the circuit can compensate OLED characteristic shift;
（3）AMOLED显示像素点驱动电路的数据输入电压信号VDATA和输出电流IOLED呈线性关系，斜率为1/RFB,实现了线性灰度显示。(3) The data input voltage signal VDATA of the AMOLED display pixel drive circuit and the output current IOLED have a linear relationship, and the slope is 1/RFB , realizing linear grayscale display.
上述实施例仅为本发明较佳的实施方式，但本发明的实施方式并不受上述实施例的限制，其他任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化，均应为等效的置换方式，都包含在本发明的保护范围之内。The above-mentioned embodiment is only a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.
本实施例中的AMOLED显示像素点驱动电路只是AMOLED显示像素点驱动电路的一种典型，其它类型显示像素点驱动电路（如将AMOLED像素点内电路中的OLED换成LED），在未背离本发明精神实质与电路原理的情况下，都可以实现对晶体管特性偏移补偿，得到较快的响应时间，实现线性灰度显示。The AMOLED display pixel driving circuit in this embodiment is only a typical AMOLED display pixel driving circuit. In the case of the spirit of the invention and the principle of the circuit, it is possible to realize offset compensation for transistor characteristics, obtain a faster response time, and realize linear grayscale display.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510360543.9ACN105139799B (en) | 2015-06-26 | 2015-06-26 | A kind of AMOLED display pixels point drive circuit and its driving method |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510360543.9ACN105139799B (en) | 2015-06-26 | 2015-06-26 | A kind of AMOLED display pixels point drive circuit and its driving method |
| Publication Number | Publication Date |
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| CN105139799A CN105139799A (en) | 2015-12-09 |
| CN105139799Btrue CN105139799B (en) | 2018-02-06 |
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| CN201510360543.9AExpired - Fee RelatedCN105139799B (en) | 2015-06-26 | 2015-06-26 | A kind of AMOLED display pixels point drive circuit and its driving method |
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