CN105989791A - Oled pixel compensation circuit and a pixel driving method oled - Google Patents

Oled pixel compensation circuit and a pixel driving method oled Download PDF

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CN105989791A
CN105989791A CN201510041927.4A CN201510041927A CN105989791A CN 105989791 A CN105989791 A CN 105989791A CN 201510041927 A CN201510041927 A CN 201510041927A CN 105989791 A CN105989791 A CN 105989791A
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transistor
driving
voltage
connected
node
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CN201510041927.4A
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周兴雨
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上海和辉光电有限公司
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Abstract

The present invention discloses an OLED pixel compensation circuit and an OLED pixel driving method. The method comprises the steps of resetting step: writing a second power supply into the grid electrode of a driving transistor by a compensation driving module; compensating step: writing the data voltage into one end of a storage capacitor, connected with a second node, by a data voltage coupling module , and writing the threshold voltage of the driving transistor into the other end of the storage capacitor, connected with a first node, by the compensation driving module; light emitting display step: coupling the data voltage stored in the storage capacitor to the grid electrode of the driving transistor. At this time, the driving transistor controlled by a light-emitting control terminal converts the driving voltage into a driving current for driving an organic light-emitting diode to emit the light. Based on the method, the influence of the variation of the power supply voltage of the pixel compensation circuit on the brightness of the organic light-emitting diode can be compensated.

Description

OLED像素补偿电路和OLED像素驱动方法 OLED pixel compensation circuit and a method of driving OLED pixel

技术领域 FIELD

[0001] 本发明涉及一种像素补偿电路和像素驱动方法,尤指一种用于0LED显示装置的像素补偿电路和像素驱动方法。 [0001] The present invention relates to a pixel driving circuit and a pixel compensation methods, and particularly to a compensation circuit and a pixel for pixel driving method of a display apparatus 0LED. 背景技术 Background technique

[0002] 0LED显示装置具有省电、适合大尺寸与全彩化的特点,但是在应用过程中也延伸出许多问题,例如0LED作为开关或驱动元件之用的薄膜晶体管(Thin Film Transistor, TFT)的材料特性的变异与材料老化程度不同会造成面板显示的不均匀的现象。 [0002] 0LED display device having a low power consumption, large size and characteristics suitable for full color, but also extends in the application process many problems, e.g. 0LED as a switching thin film transistor or the driving element (Thin Film Transistor, TFT) the degree of variability and aging of the material properties of different materials can cause the phenomenon of uneven panel display. 另外OLED 长时间使用后会导致OLED器件老化,伴随器件的老化会产生阈值电压上升、发光效率下降的问题。 Further OLED after prolonged use can lead to aging of an OLED device, accompanying the aging device will produce a threshold voltage is increased, the light emission efficiency decreased. 为了解决上述问题本领域技术人员提出了多种像素补偿电路用来补偿0LED以及驱动元件阈值电压变化。 To solve the above problems to those skilled proposed various compensation circuit for compensating the pixel and a driving element 0LED threshold voltage variations.

[0003] 图1所示为现有技术中的0LED像素驱动电路,通过分析可知,该电路驱动0LED 发光时流过OLED的电流符合以下公式:Id= 1/2 y CmW/L(Ewdd-VdJ2,由上述公式可知流过0LED发光时流过其两端的电流由电源电压EWDD和数据电压V data决定,虽然在通常情况下电源电压EWDD可视为理想的电压源,但是近年来0LED面板的尺寸不断增大,导致其内部的电源线不断增长,由此引入的分布电阻导致电源电压匕胃产生不可忽视的压降,而电源电压EWDD的压降也会导致0LED的亮度产生不符合预期的变化。发明内容 Current flows through the OLED when the pixel driving circuit 0LED the prior art, by analysis, the circuit shown drives the light emitting 0LED [0003] FIG. 1 with the following equation: Id = 1/2 y CmW / L (Ewdd-VdJ2 current flows through both ends thereof EWDD and the data voltage V data is determined by the supply voltage, although the power supply voltage EWDD ideal voltage source may be considered under normal circumstances, but in recent years 0LED panel dimensions, apparent from the above equation flows through the light emitting 0LED increasing, the internal power supply line leading to growing, thereby introducing the distributed resistance causes the power supply voltage generated dagger stomach drop can not be ignored, and the power supply voltage drop will lead to luminance EWDD 0LED produced does not meet the expected changes . SUMMARY

[0004] 本发明的目的在于提供一种0LED像素补偿电路和0LED像素驱动方法,其能够补偿不同驱动晶体管的阈值电压Vth不一致导致0LED显示器图像不均匀的问题;进一步的本发明的0LED像素补偿电路还可以补偿因为像素补偿电路因电源电压不问定导致的图像不均匀的问题。 [0004] The object of the present invention is to provide a circuit and a pixel compensation 0LED 0LED pixel driving method which can compensate for different driving transistor threshold voltage Vth 0LED inconsistent result in uneven display image problem; 0LED pixel compensation circuit of the present invention further It can also compensate for non-uniformity of the pixel image problem because the power supply voltage compensation circuit irrespective of the cause given.

[0005] 为了解决上述问题,本发明提供一种0LED像素补偿电路其包括:数据电压耦合模块以及补偿驱动模块,其中: [0005] In order to solve the above problems, the present invention provides a 0LED pixel compensation circuit comprising: a data voltage and a compensation module coupled to the drive module, wherein:

[0006] 所述数据电压耦合模块用于在第一扫描端的控制下把数据信号耦合到驱动晶体管的栅极,从而利用数据信号来控制驱动晶体管的电流; [0006] means for coupling said voltage data under control of a first scan data signal terminal coupled to the gate of the driving transistor, a data signal so as to control the current of the driving transistor;

[0007] 所述补偿驱动模块包括驱动晶体管,所述补偿驱动模块用于补偿驱动晶体管的阈值电压,并利用数据电压耦合模块的电压来控制驱动晶体管的电流,进而产生稳定的电流提供给有机发光二极管。 [0007] The compensation drive module includes a driving transistor, the driving means for compensating threshold voltage compensation of the driving transistor, the data voltage and the voltage coupling module to control the current of the driving transistor, thereby generating a stable current to the organic light emitting diode.

[0008] 本发明的0LED像素补偿电路的进一步改进在于:所述补偿驱动模块还包括第三晶体管以及第一晶体管和第二晶体管,其中:所述第一晶体管的栅极连接于所述发光控制端,其源极连接于第三节点,其漏极和被驱动的有机发光二极管的阳极连接,所述有机发光二极管的阴极和第三电源连接;所述驱动晶体管的栅极连接于第一节点,其漏极连接于所述第三节点,其源极连接于第一电源;所述第三晶体管的栅极连接于所述第一扫描端,其漏极连接于所述第一节点,其源极连接于所述第三节点;所述第二晶体管的栅极连接于第二扫描端,其源极连接于所述第一节点,其漏极连接于第二电源。 [0008] Further improvements 0LED pixel compensation circuit of the invention is characterized in: the compensation driving module further comprises a third transistor and a first and second transistors, wherein: the gate of the first transistor is connected to the emission control terminal, the source connected to the third node, and its drain connected to the anode of the organic light emitting diode is driven, the cathode of the organic light emitting diode and a third power supply is connected; a gate of the driving transistor is connected to the first node a drain connected to said third node, its source connected to a first power source; a gate of the third transistor is connected to the first scan terminal, the drain is connected to the first node, which source connected to the third node; the gate of the second transistor is connected to a second end of the scan, a source connected to said first node, a drain connected to the second power source.

[0009] 所述数据电压耦合模块包括存储电容、第四晶体管以及第五晶体管,其中:所述第四晶体管的栅极连接于所述第一扫描端,其源极连接于第二节点,其漏极连接于所述数据信号端;所述第五晶体管的栅极连接于所述发光控制端,其源极连接于所述第二节点,其漏极连接于所述第二电源;所述存储电容的一端连接于所述第一节点,其另一端连接于所述第二节点;存储电容的一端连接于第一节点,其另一端连接于第二节点。 [0009] The coupling module comprises a data storage capacitor voltage, the fourth transistor and a fifth transistor, wherein: a gate of the fourth transistor connected to the first end of the scan, the source is connected to the second node a drain terminal connected to the data signal; and the gate of the fifth transistor is connected to the light emitting control terminal, and a source connected to said second node, its drain connected to the second power source; the end of the storage capacitor is connected to the first node, and the other end connected to the second node; end of the storage capacitor is connected to the first node, the other end connected to the second node.

[0010] 本发明的0LED像素补偿电路的进一步改进在于:所述的第一晶体管、第二晶体管、第三晶体管、第四晶体管、第五晶体管以及驱动晶体管均为P沟道晶体管。 [0010] Further improvements 0LED pixel compensation circuit of the present invention, wherein: said first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor and a driving transistor are P-channel transistor.

[0011] 本发明的0LED像素补偿电路的进一步改进在于:所述的第一晶体管、第二晶体管、第三晶体管、第四晶体管、第五晶体管以及驱动晶体管均为薄膜晶体管。 0LED pixel compensation circuit further improved [0011] The present invention is characterized in: said first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor and a driving transistor are thin film transistors.

[0012] 本发明的0LED像素补偿电路的进一步改进在于:所述第一电源输出正电压;所述第二电源是一个具有参考的电压源。 [0012] Further improvements 0LED pixel compensation circuit of the present invention, wherein: the first positive voltage power supply output; said second power source is a voltage source having a reference.

[0013] 本发明的0LED像素补偿电路的进一步改进在于:所述第一电源和第二电源均为直流电源,所述第一电源输出的电压大于所述第二电源输出的电压。 [0013] Further improvements 0LED pixel compensation circuit of the invention is characterized in: said first and second power sources are direct current power supply, the output voltage is greater than the first power supply voltage of the second power supply output.

[0014] 本发明还提供一种适用于上述0LED像素补偿电路的0LED像素驱动方法,其包括以下步骤: [0014] The present invention also provides a method suitable for the above-mentioned pixel driving 0LED 0LED pixel compensation circuit, comprising the steps of:

[0015] S1,补偿过程:第一扫描端控制数据电压耦合模块把数据信号耦合到驱动晶体管的栅极,从而利用数据信号来控制驱动晶体管的电流; [0015] S1, compensation process: a first scan voltage terminal coupled to the control module the data the data signal coupled to the gate of the driving transistor, a data signal so as to control the current of the driving transistor;

[0016] S2,发光显示过程:发光控制端控制补偿驱动模块接收所述阈值补偿模块输出的所述驱动电压,并利用驱动晶体管将所述驱动电压转换为供驱动有机发光二极管发光的驱动电流。 [0016] S2, the light emitting display process: the light emission control terminal of the control module receives the compensation driving threshold compensation module output drive voltage, the drive transistor and the driving voltage is converted into a driving current for driving the organic light emitting diode emits light.

[0017] 本发明还提供一种适用于上述0LED像素补偿电路的0LED像素驱动方法,其包括以下步骤: [0017] The present invention also provides a method suitable for the above-mentioned pixel driving 0LED 0LED pixel compensation circuit, comprising the steps of:

[0018] S1,复位过程:第二扫描端控制第二晶体管导通,此时第二晶体管的第一端和第二端短路,把第二电源写进驱动晶体管的栅极; [0018] S1, the reset process: scanning a second control terminal of the second transistor is turned on, while the first and second ends of the second short-circuit transistor, the second power source is written into the gate of the driving transistor;

[0019] S2,补偿过程:第一扫描端控制第三晶体管导通和第四晶体管导通,驱动晶体管呈二极管接法,此时第一晶体管、第二晶体管以及第五晶体管处于关断状态;数据电压耦合模块把数据电压写在存储电容连接于第二节点的一端,补偿驱动模块把驱动晶体管的阈值电压写在存储电容连接于第一节点的一端; [0019] S2, the compensation procedure: first scanning control terminal of the third transistor and the fourth transistor is turned on, the driving transistor as a diode-connected, while the first transistor, a second transistor and the fifth transistor is in an off state; coupling module data voltage in the data write voltage end of the storage capacitor is connected to the second node, the compensation drive module drive transistor threshold voltage is written in the end of the storage capacitor is connected to the first node;

[0020] S3,发光显示过程:发光控制端控制第一晶体管和第五晶体管导通,第二晶体管、 第三晶体管以及第四晶体管处于关断状态,存储电容中存储数据电压耦合至驱动晶体管的栅极,此时驱动晶体管受控于发光控制端将所述驱动电压转换为驱动有机发光二极管发光的驱动电流。 [0020] S3, the light emitting display process: a first light emission control terminal of the control transistor and the fifth transistor is turned on, the second transistor, a third transistor and a fourth transistor is in an off state, the data voltage stored in the storage capacitor is coupled to the driving transistor the gate, when the driving transistor being controlled by the light emission control terminal of the driving voltage to drive the organic light emitting diode is converted into light emission driving current.

[0021] 本发明的0LED像素驱动方法的进一步改进在于:任意时刻所述第一扫描端和所述第二扫描端的输出电压至少有一个为高电平。 0LED pixel further improved driving method [0021] of the present invention is that: any time the first scan voltage terminal and the output terminal of said second scan at least a high level.

[0022] 本发明的0LED像素驱动方法的进一步改进在于:0LED像素补偿电路处于发光显示过程时,存储电容两端的电压保持不变。 0LED pixel further improved driving method [0022] of the present invention is: 0LED pixel compensation circuit in a light emitting display process, the voltage across the storage capacitor remains unchanged.

[0023] 本发明的0LED像素驱动方法的进一步改进在于:驱动有机发光二极管发光的电流为数据信号端电压的函数,并且所述电流与驱动晶体管的阈值电压以及第一电源的电压无关。 [0023] 0LED pixel further improvement of the driving method of the present invention is that: the current driving the organic light emitting diode as a function of the data signal voltage, and the current is independent of the threshold voltage of the driving transistor and the first power supply voltage.

[0024] 本发明的0LED像素补偿电路中包含一个存储电容,一方面该存储电容在补偿过程中可以存储数据信号的电压以及驱动晶体管的阈值电压Vth,这样在发光显示过程中流过驱动晶体管第一端和第二端的电流不会受到驱动晶体管阈值电压Vth变化的影响,另一方面在补偿过程中存储电容储存的电压还和像素补偿电路的电源电压相关,所以像素补偿电路的电源电压的变化不会影响到流过驱动晶体管第一端和第二端的电流以及有机发光二极管的亮度。 [0024] 0LED pixel compensation circuit of the present invention comprises a storage capacitor, the storage capacitor on the one hand in the compensation process can be a voltage and the threshold voltage Vth of the driving transistor for storing data signals, so that the light emitting display during the first drive transistor flows and second ends of the current driving transistor is not affected by changes in the threshold voltage Vth, on the other hand further storage voltage of the storage capacitor and the power supply voltage related to the pixel compensation circuit in the compensation process, the power supply voltage variations pixel compensation circuit is not It will affect the current and the luminance of the organic light emitting diode drive transistor flowing through a first end and a second end. 附图说明 BRIEF DESCRIPTION

[0025] 图1为现有技术中的0LED像素补偿电路的电路图; [0025] FIG. 1 is a circuit diagram of a pixel compensation circuit 0LED the prior art;

[0026] 图2为本发明的0LED像素补偿电路的电路图; [0026] The circuit diagram of FIG 0LED pixel compensation circuit 2 of the present invention;

[0027] 图3为本发明0LED像素驱动方法中像素补偿电路的驱动信号的时序图; [0027] FIG. 3 is a pixel driving method 0LED timing chart of driving signals in the pixel compensation circuit of the present invention;

[0028] 图4为本发明0LED像素驱动方法中0LED像素补偿电路处于复位过程时的电路状态图; [0028] FIG. 4 0LED pixel circuit state when the driving method of FIG. 0LED pixel compensation circuit in a reset process of the present invention;

[0029] 图5为本发明0LED像素驱动方法中0LED像素补偿电路处于补偿过程时的电路状态图; [0029] FIG. 5 is a state diagram of the pixel circuit 0LED driving method 0LED pixel compensation circuit compensating process in the invention;

[0030] 图6为本发明0LED像素驱动方法中0LED像素补偿电路处于发光显示过程的电路状态图。 0LED pixel driving method according to [0030] of the present invention, FIG. 6 0LED pixel compensation circuit is a circuit state of a light emitting display process. 具体实施方式 Detailed ways

[0031] 下面结合附图以及具体实施方式对本发明作进一步详细的说明。 [0031] The present invention will be further described in detail in conjunction with accompanying drawings and specific embodiments.

[0032] 如图2所示,在本实施例中0LED像素补偿电路包括:数据电压耦合模块10以及补偿驱动模块20,其中: [0032] As shown in FIG. 2, in the present embodiment 0LED pixel compensation circuit comprising: a data voltage offset drive coupling module 10 and the module 20, wherein:

[0033] 数据电压親合模块10包括存储电容C1;数据电压親合模块10用于在第一扫描端&的控制下把接收自数据信号端的数据信号耦合到驱动晶体管!^的栅极,从而利用数据信号来控制驱动晶体管T6源极和漏极之间的电流。 [0033] The affinity data voltage storage capacitor module 10 comprises a C1;! Gate voltage data affinity module 10 for scanning at a first end of the control & signal from the data terminal receives the data signal is coupled to the driving transistor ^, whereby T6 to control the current between the source and drain of the driving transistor with a data signal.

[0034] 补偿驱动模块20包括驱动晶体管T6,补偿驱动模块20用于补偿驱动晶体管^的阈值电压Vth,并利用数据电压耦合模块10的电压来控制驱动晶体管T6的电流,进而产生稳定的电流提供给有机发光二极管。 [0034] The compensation driving module 20 includes a driving transistor T6, the compensation drive module 20 for compensating for the driving transistor ^ threshold voltage Vth, the using data voltage coupling module voltage 10 controls the drive current of transistor T6, thereby generating a stable current supply to the organic light emitting diode.

[0035] 数据电压耦合模块10还包括第四晶体管T4以及第五晶体管!^,其中:第四晶体管T4的栅极连接于第一扫描端S n,其源极连接于第二节点b,其漏极连接于数据信号端第五晶体管T5的栅极连接于发光控制端E n,其漏极连接于第二电源GND,其源极连接于第二节点b ;存储电容(^的一端连接于第一节点a,其另一端连接于第二节点b。 [0035] The data voltage coupling module 10 further includes a fourth transistor and a fifth transistor T4 ^, wherein:! Gate of the fourth transistor T4 is connected to a first end of the scan S n, its source connected to the second points b, which a drain connected to the gate terminal of the fifth transistor T5 is a data signal is connected to the light emitting control terminal E n, a drain connected to the second power supply GND, its source connected to the second node B; end of the storage capacitor (^ is connected to the a first node a, the other end connected to the second node b.

[0036] 补偿驱动模块10还包括第二晶体管T2、第三晶体管T3以及第一晶体管T i,其中: 第一晶体管的栅极连接于发光控制端E n,其源极连接于第三节点c,其漏极连接于待驱动的有机发光二极管0LED的阳极;有机发光二极管0LED的阴极连接于第三电源Ewss;驱动晶体管16的栅极连接于第一节点a,其漏极连接于第三节点c,其源极连接于第一电源EWDD;第三晶体管T3的栅极连接于第一扫描端S n,其漏极连接于第一节点a,其源极连接于第三节点c ;第二晶体管T2的栅极连接于第二扫描端S ni,其源极连接于第一节点a,其漏极连接于第二电源GND。 [0036] The compensation driving module 10 further includes a second transistor T2, third transistor T3 and a first transistor T i, wherein: a gate of the first transistor is connected to a light emission control terminal E n, the source is connected to a third node c a drain connected to the anode of the organic light emitting diode to be driven by the 0LED; 0LED organic light emitting diode cathode connected to a third power Ewss; a gate of the driving transistor 16 is connected to the first node a, the drain is connected to the third node c, its source connected to a first power source EWDD; gate of the third transistor T3 is connected to a first end of the scan S n, a drain connected to the first node a, the source is connected to the third node C; a second the gate of transistor T2 is connected to the second end of the scan S ni, its source connected to the first node a, a drain connected to the second power supply GND.

[0037] 本实施例中上述的第一晶体管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,驱动晶体管T6均为P沟道薄膜晶体管。 [0037] In the present embodiment the above-described embodiment the first transistor T1, a second transistor T2, third transistor T3, a fourth transistor T4, a fifth transistor T5, T6 driving transistor are P-channel thin film transistor.

[0038] 第一电源E_为输出正电压,第二电源GND接地并且第二电源GND是一个具有参考的电压源,第三电源Ewss为0LED面板内部所有0LED的公共阴极。 [0038] The first positive voltage power source E_ output, a second power source GND is a ground power source GND and the second reference voltage source having a third power Ewss inner panel is 0LED 0LED of all common cathode. 第一电源E WDD以及第二电源GND的电压均为直流电源,第一电源&_输出的电压大于所述第二电源GND输出的电压。 A first power supply voltage and a second power supply GND E WDD are DC power, the first power supply voltage is greater than & _ the output voltage of the second output power source GND.

[0039] 如图2和图3所示,本发明的技术方案中适用于上述0LED像素驱动电路的0LED 像素驱动方法包括以下步骤: [0039] As shown in FIG. 2 and FIG. 3, the aspect of the present invention is applied to the pixel driving circuit 0LED 0LED pixel driving method comprising the steps of:

[0040] S1,补偿过程:第一扫描端控Sjjlj数据电压耦合模块10把数据信号耦合到驱动晶体管T6的栅极,从而利用数据信号来控制驱动晶体管T 6源极和漏极之间的电流。 [0040] S1, compensation process: scanning a first end coupled to the control module 10 Sjjlj data voltage data signal is coupled to the gate of the driving transistor T6, so that a data signal to control the current driving transistor T 6 between the source and the drain .

[0041] S2,发光显示过程:发光控制端En控制补偿驱动模块20接收阈值补偿模块10输出的数据电压,并将所述数据电压转换为供驱动有机发光二极管发光的驱动电流。 [0041] S2, the light emitting display process: En emission control compensation control terminal voltage of the data driving module 10 outputs a threshold compensation module 20 receives and converts the data voltage to the organic light emitting diode driver for driving current.

[0042] 上面的0LED像素驱动方法在每个显示周期过后存储电容Q中会有残留的驱动电压,因此可进一步在0LED像素驱动方法中引入复位过程以消除前一个显示周期对像素驱动电路的影响。 Effect of a period prior to the display pixel drive circuit [0042] The above driving method 0LED pixels per display period after the capacitor Q in the memory will be remaining in the driving voltage, the reset process can be further introduced in 0LED pixel driving method to eliminate . 如图2和图3所示,该0LED像素驱动方法通过第一扫描端Sn,第二扫描端Sn:以及发光控制端£„控制0LED像素补偿电路中的晶体管按照预定的时序导通或者关断。 本实施例的方法包括以下三个步骤: 2 and 3, the driving method 0LED pixel by the first scanning terminal Sn, a second scan end Sn: emission control terminal £ "control compensation circuit of the transistor according to the predetermined timing 0LED pixel is turned on or off the method of the present embodiment includes the following three steps:

[0043] S1,复位过程:对应图3中h状态,第二扫描端S ni控制第二晶体管T 2导通,此时第二晶体管1的第一端和第二端短路,第一节点a和第二电源GND短接;补偿驱动模块20 把第二电源GND的电压写进驱动晶体管T6的栅极从而对驱动晶体管T 6的栅极进行复位。 [0043] S1, the reset process: h corresponds to the state in FIG. 3, the second terminal S ni scanning control of the second transistor T 2 is turned on, while the first terminal of the second transistor and the second end a short circuit, a first node a second power source GND and the shorted; compensation driving voltage of the second power supply GND block 20 is written into the gate of the driving transistor T6 such that the gate of the driving transistor T 6 is reset.

[0044] S2,补偿过程:对应图3中t2状态,第一扫描端S n控制第三晶体管T 3导通和第四晶体管T4导通,驱动晶体管T 6呈二极管接法,此时第一晶体管T 1、第二晶体管1~2以及第五晶体管1处于关断状态;数据电压耦合模块10把数据电压写在存储电容C i连接于第二节点b的一端,补偿驱动模块20把驱动晶体管T6_值电压V th写在存储电容连接于第一节点a的一端; [0044] S2, compensation process: t2 corresponds to the state in FIG. 3, a first scan S n control terminal of the third transistor T 3 is turned on and the fourth transistor T4 is turned on, the driving transistor T 6 as a diode-connected, while the first transistor T 1, a second transistor and a fifth transistor 1 2 1 in an off state; a data voltage coupling module 10 to write the data voltage in the end of the storage capacitor C i is connected to the second node b, the compensation of the drive transistor driver module 20 T6_ written value voltage V th storage capacitor connected to the first end point a;

[0045] S3,发光显示过程:对应图3中t3状态,发光控制端E n控制第一晶体管T i导通和第五晶体管T5导通,第二晶体管T 2、第三晶体管T3以及第四晶体管T 4处于关断状态,存储电容Q以及第二电源GND的电压叠加存储的数据电压耦合至驱动晶体管T 6的栅极,此时驱动晶体管T6处于饱和区,流过驱动晶体管T 6第一极和第二极的电流驱动有机发光二极管发光。 [0045] S3, the light emitting display process: the state corresponding to t3 in FIG. 3, the light emission control terminal E n T i controls the first transistor is turned on and the fifth transistor T5 is turned on, the second transistor T 2, a third and a fourth transistor T3 the transistor T 4 is in an off state, the data Q and a storage capacitor coupled voltage superimposing voltage stored second power source GND to the gate of the driving transistor T 6, when the driving transistor T6 is in the saturation region, the driving transistor T 6 flowing through the first and a second current electrode of the electrode driving an organic light emitting diode. 在此过程中存储电容(^两端的电压保持不变。 In this process, the voltage (^ across the storage capacitor remains unchanged.

[0046] 如图3和图4所示,当0LED像素补偿电路处于复位过程时第一扫描端Sn以及发光控制端4为高电平,第二扫描端S ni为低电平。 [0046] FIGS. 3 and 4, when the circuit is in a reset 0LED pixel compensation process of the first scan side Sn and the light emission control terminal 4 is high, the second end of the scan S ni is low. 此时受第一扫描段S n控制第三晶体管T 3 和第四晶体管T4关断;受第二扫描端S ni控制的第二晶体管T 2导通;受发光控制端E n控制的第一晶体管和第五晶体管T 5关断。 A first control terminal by the light emission control E n; in this case by a first scan segment S n controlling the third transistor T 3 and a fourth transistor T4 is turned off; a second transistor receiving the second scan S ni control terminal T 2 of conducting and fifth transistors T 5 is turned off.

[0047] 当0LED像素补偿电路处于复位过程时,第二晶体管T2处于导通状态,所以第二晶体管T2的第一极和第二极之间相当于短路,此时第一节点a的电压等于第二电源GND电压, 第二电源GND对驱动晶体管^的栅极进行复位。 [0047] When the pixel compensation circuit is reset 0LED process, the second transistor T2 is in the on state, the equivalent of a short circuit between the first electrode of the second transistor T2 and a second electrode, when a voltage of the first node is equal to a second power source voltage GND, the second power source GND to the gate of the driving transistor ^ is reset. 虽然在复位过程时驱动晶体管T 6的栅极和源极的电势差远远大于Vth但是由于由受发光控制端E n控制的第一晶体管T i处于关断状态,所以不会有电流流过有机发光二极管导致其发光。 While the gate and source of the driving transistor T 6 in the reset process when the electrode potential difference but due to the much larger than Vth by a first transistor control terminal T I E n emission control is in the OFF state, no current flows through the organic resulting in the emission light-emitting diode.

[0048] 如图3和图5所述,当0LED像素补偿电路处于补偿过程时第二扫描端Sn i以及发光控制端匕为高电平,第一扫描端S „为低电平。此时受第一扫描段S n控制第三晶体管T 3 和第四晶体管T4均为导通;受第二扫描端S ni控制的第二晶体管T 2关断;受发光控制端E n 控制的第一晶体管和第五晶体管T 5关断。在同一时刻第一扫描S „端和第二扫描端S ni 的电压至少有一个为高电平。 [0048] FIG. 3 and FIG. 5, when the pixel compensation circuit 0LED compensation process in a second scanning light-emitting end and a control terminal Sn i dagger is high, a first end of the scan S "low level. At this time a first scan by controlling the third segment S n transistor T 3 and a fourth transistor T4 are turned on; S ni receiving end a second scan controlling a second transistor T 2 is turned off; light emission control terminal receiving a first control E n and fifth transistors T 5 is turned off. at the same time scanning the first S "and second S ni scanning end of at least one high voltage.

[0049] 当0LED像素补偿电路处于补偿过程的状态时,由于第二晶体管T2关断,第三晶体管T3导通,此时第一节点a和第三节点c的电压相等并且驱动晶体管T 6处于二极管接法, 所谓二极管接法就是驱动晶体管T6的栅极和漏极短接。 [0049] When the pixel compensation circuit 0LED compensation process in the state, since the second transistor T2 is turned off, the third transistor T3 is turned on, then the first node and a third node c and is equal to the voltage at the driving transistor T 6 diode-connected, that is, a so-called diode-connected gate and drain of the driving transistor T6 is short-circuited. 此时第一晶体管T 1、第二晶体管T2 以及第五晶体管T5导通其他晶体管关断,因此在第一电源E WDD、驱动晶体管T6、第三节点c、 第一节点a、存储电容Q、第二节点b以及数据信号端之间形成一条电流通路。 At this time, the first transistor T 1, a second transistor T2, the fifth transistor T5 is turned on and the other transistor is turned off, so the first power source E WDD, the driving transistor T6, the third node C, node a, the storage capacitor Q, forming a current path between the second node and a data signal terminal b. 此时第一电源E_和据信号端通过上述电路向存储电容C i充电,流过上述电流通路的电流随存储电容(^两端电压U ab的升高而降低。上述电流通路的导通条件为:第一电源E WDD的和第一节点a之间的电势差大于驱动晶体管T6的阈值电压V th。存储电容(^沿上述电流通路充电直到驱动晶体管T6不导通为止。综上所述,存储电容C:充电完成时其两端电压U ab =ULVDD_Vth_UDmo At this time, the data signal and the first power supply terminal E_ through said charging circuit to the storage capacitor C i, a current flowing through said current path with the storage capacitor (^ U ab voltage across the rises. Conduction of said current path conditions: the potential difference between the first power source E WDD and the first node is greater than a threshold voltage V th of the driving transistor T6 storage capacitance (^ until the charging current path along said drive transistor T6 does not conduct until the conclusion. the storage capacitor C: charge completion voltage across U ab = ULVDD_Vth_UDmo

[0050] 如图3和图6所述,当0LED像素补偿电路处于发光显示过程时第一扫描端&以及第二扫描端Sn i为高电平,发光控制端E „为低电平。此时受第一扫描段S n控制第三晶体管T3和第四晶体管T 4关断;受第二扫描端S ni控制的第二晶体管T 2关断;受发光控制端E n 控制的第一晶体管和第五晶体管T 5导通。 [0050] The FIG. 3 and FIG. 6, when the pixel compensation circuit is 0LED emitting display end process of the first scanning and the second scanning & terminal Sn i is high, the light emission control terminal E "is low. This when the first scan segment S n by controlling the third transistor T3 and the fourth transistor T 4 is turned off; S ni receiving end a second scan controlling a second transistor T 2 is turned off; light emission control terminal receiving a first control transistor E n and the fifth transistor T 5 is turned on.

[0051] 当0LED像素补偿电路处于发光显示状态时,由于第一晶体管1\以及第五晶体管T5导通,0LED像素补偿电路中形成两条通路:通路1从第一电源E WDD、驱动晶体管T6、第三节点c、第一晶体管至第三电源E wss;通路2从第二电源GND、第二节点b、存储电容C:至第一节点a。 [0051] When the pixel compensation circuit is 0LED emission display state, since the first transistor 1 \ and the fifth transistor T5 is turned on, the pixel compensation circuit formed 0LED two paths: a path from a first power source E WDD, the driving transistor T6 , a third point C, the first to third power transistors E wss; the GND power supply from the second passage 2, the second points b, the storage capacitor C: to the first node a. 对于通路1,如果驱动晶体管T6的栅极电压V a和第一电源E WDD电压差值大于驱动晶体管T6的阈值电压V th时驱动晶体管T 6导通。 The driving transistor T 6 is turned on when path 1 for, if the gate voltage of the driving transistor T6 V a voltage difference between the first power source E WDD greater than the threshold voltage V th of the driving transistor T6. 由于有机发光二极管0LED和驱动晶体管T6串接,所以流过机发光二极管0LED的电流等于流过驱动晶体管T 6漏极和源极之间的电流。 Since the organic light emitting diode and the driving transistor T6 0LED connected in series, so that the current flowing through the light emitting diode 0LED is equal to the current driving transistor T 6 between the drain and the source flows. 综上所述,当驱动晶体管T6导通时流过机发光二极管0LED的电流和第一节点a的电压Va满足如下关系: In summary, the voltage flowing through the light emitting diode and the first node 0LED a current when the driving transistor T6 is turned Va satisfy the following relationship:

[0052] 10LED= 0.5 y pC0X(ff/L) (ULVDD-Ua-Vth)2 (式1.1) [0052] 10LED = 0.5 y pC0X (ff / L) (ULVDD-Ua-Vth) 2 (Formula 1.1)

[0053] 另外串接于通路2的存储电容Q以及第二电源GND的电压耦合至第一节点a,由此得出第一节点a处的电压Ua: [0053] Further coupled in series with the storage capacitor voltage Q path 2 and a second power source GND to the first node a, it follows that the voltage Ua at a first node:

[0054] Ua=ULVDD-Vth-UDn (式1.2) [0054] Ua = ULVDD-Vth-UDn (Formula 1.2)

[0055] 将式1.2带入式1.1可得: [0055] Formula 1.2 into Equation 1.1 can be obtained:

[0056] I〇LED= 〇.5y pC0X(ff/L) (UDn)2 (式1.3) [0056] I〇LED = 〇.5y pC0X (ff / L) (UDn) 2 (Formula 1.3)

[0057] 从式1.3可知流过有机发光二极管OLED的电流IaED只和数据信号端的电压UDni有关和驱动晶体管T6的阈值电压V th以及第一电源E WDD的电压U WDD无关,而有机发光二极管0LED的亮度由流过有机发光二极管0LED的电流IaED决定,所以通过本发明0LED像素补偿电路的补偿之后可以消除第一电源EWDD的电压U WDD的误差和驱动晶体管T 6的阈值电压V th 的误差对机发光二极管0LED的影响。 [0057] Flow from the Formula 1.3 can be seen through the organic light emitting diode OLED current IaED only and the voltage of the data signal terminal UDni the threshold voltage V th of the transistor T6 and the first power source E WDD related voltage U WDD independent, the organic light emitting diode 0LED luminance flowing through the organic light emitting diode current IaED 0LED decision, it is possible to eliminate an error voltage of the first power source EWDD the U WDD error and the driving transistor T the threshold voltage V th 6 after passing through 0LED pixel compensation the compensation circuit of the present invention to Effect of organic light emitting diode 0LED.

[0058] 以上结合附图实施例对本发明进行了详细说明,本领域中普通技术人员可根据上述说明对本发明做出种种变化例。 [0058] While the invention has been described in detail in conjunction with the accompanying drawings embodiments of ordinary skill in the art that various changes may be made to the above embodiment of the present invention is described. 因而,实施例中的某些细节不应构成对本发明的限定,本发明将以所附权利要求书界定的范围作为本发明的保护范围。 Thus, certain details of the embodiments should not be construed as limiting the present invention, the present invention will define the scope of the claims appended as the scope of the present invention.

Claims (12)

1.一种OLED像素补偿电路,其特征在于包括:数据电压耦合模块以及补偿驱动模块, 其中:所述数据电压耦合模块用于在第一扫描端的控制下把数据信号耦合到驱动晶体管的栅极,从而利用数据信号来控制驱动晶体管的电流;所述补偿驱动模块包括驱动晶体管,所述补偿驱动模块用于补偿驱动晶体管的阈值电压,并利用数据电压耦合模块的电压来控制驱动晶体管的电流,进而产生稳定的电流提供给有机发光二极管。 An OLED pixel compensation circuit, comprising: a data voltage and a compensation module coupled to the drive module, wherein: the means for coupling the gate voltage of the data signal coupling data under control of a first scan to the end of the driving transistor so that a data signal to control the current driving transistor; compensating said drive module includes a driving transistor, the driving means for compensating threshold voltage compensation of the driving transistor, the data voltage and the voltage coupling module to control the current driving transistor, Further generate a stable current supplied to the organic light emitting diode.
2.—种如权利要求1所述的0LED像素补偿电路,其特征在于:所述补偿驱动模块还包括第三晶体管、第一晶体管以及第二晶体管,其中:所述第一晶体管的栅极连接于发光控制端,其源极连接于第三节点,其漏极和被驱动的有机发光二极管的阳极连接,所述有机发光二极管的阴极和第三电源连接;所述驱动晶体管的栅极连接于第一节点,其漏极连接于所述第三节点,其源极连接于第一电源;所述第三晶体管的栅极连接于所述第一扫描端,其漏极连接于所述第一节点,其源极连接于所述第三节点;所述第二晶体管的栅极连接于第二扫描端,其源极连接于所述第一节点,其漏极连接于第二电源。 0LED pixel compensation circuit according to claim 1 2.- species, wherein: said compensation module further comprises a third drive transistor, the first transistor and a second transistor, wherein: said first transistor connected to the gate light emitting control terminal, and a source connected to a third node, its drain connected to the anode and the organic light emitting diode is driven, the cathode of the organic light emitting diode and a third power supply is connected; a gate of the driving transistor is connected to the first node, a drain connected to said third node, its source connected to a first power source; gate of the third transistor is connected to the first end of the scan, a drain connected to the first node, a source connected to said third node; a gate of the second transistor is connected to the second end of the scan, a source connected to said first node, a drain connected to the second power source.
3.—种如权利要求2所述的0LED像素补偿电路,其特征在于:所述数据电压耦合模块包括存储电容、第四晶体管以及第五晶体管,其中:所述第四晶体管的栅极连接于所述第一扫描端,其源极连接于第二节点,其漏极连接于数据信号端;所述第五晶体管的栅极连接于所述发光控制端,其源极连接于所述第二节点,其漏极连接于所述第二电源;所述存储电容的一端连接于所述第一节点,其另一端连接于所述第二节点;存储电容的一端连接于第一节点,其另一端连接于第二节点。 0LED pixel compensation circuit according to claim 2 3.- species, wherein: said coupling module comprises a data storage capacitor voltage, the fourth transistor and a fifth transistor, wherein: a gate of said fourth transistor is connected to the scanning said first end, which second node is connected to a source electrode, a drain terminal connected to the data signal; and the gate of the fifth transistor is connected to the light emitting control terminal, a source connected to the second node, a drain connected to the second power source; end of the storage capacitor is connected to the first node, and the other end connected to the second node; end of the storage capacitor is connected to the first node, the other one end connected to the second node.
4.如权利要求3所述的0LED像素补偿电路,其特征在于:所述的第一晶体管、第二晶体管、第三晶体管、第四晶体管、第五晶体管以及驱动晶体管均为P沟道晶体管。 4. 0LED pixel compensation circuit according to claim 3, wherein: said first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor and a driving transistor are P-channel transistor.
5.如权利要求3所述的0LED像素补偿电路,其特征在于:所述的第一晶体管、第二晶体管、第三晶体管、第四晶体管、第五晶体管以及驱动晶体管均为薄膜晶体管。 5. 0LED pixel compensation circuit according to claim 3, wherein: said first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor and a driving transistor are thin film transistors.
6.如权利要求3所述的0LED像素补偿电路,其特征在于:所述第一电源输出正电压; 所述第二电源是一个具有参考的电压源。 6. 0LED pixel compensation circuit according to claim 3, wherein: said first positive voltage power supply output; said second power source is a voltage source having a reference.
7.如权利要求3所述的0LED像素补偿电路,其特征在于:所述第一电源和第二电源均为直流电源,所述第一电源输出的电压大于所述第二电源输出的电压。 7. 0LED pixel compensation circuit according to claim 3, wherein: said first and second power sources are direct current power supply, the first power supply voltage is greater than the output voltage of the second power supply output.
8.—种适用于如权利要求1所述0LED像素补偿电路的0LED像素驱动方法,其特征在于包括以下步骤:S1,补偿过程:第一扫描端控制数据电压耦合模块把数据信号耦合到驱动晶体管的栅极,从而利用数据信号来控制驱动晶体管的电流;S2,发光显示过程:发光控制端控制补偿驱动模块接收所述阈值补偿模块输出的所述驱动电压,并利用驱动晶体管将所述驱动电压转换为供驱动有机发光二极管发光的驱动电流。 8.- suitable for the species. 1 0LED pixel compensation circuit 0LED pixel driving method as claimed in claim, characterized by comprising the steps of: Sl, compensation process: a first scan voltage terminal coupled to the data control module is coupled to the data signal driving transistor gate, so that a data signal to control the current driving transistor; S2, a light emitting display process: the light emission control terminal of the control module receives the compensation driving threshold compensation module output drive voltage and the drive voltage of the driving transistor is converted to a driving current for driving the organic light emitting diode emits light.
9.一种适用于如权利要求3所述0LED像素补偿电路的0LED像素驱动方法,其特征在于包括以下步骤:S1,复位过程:第二扫描端控制第二晶体管导通,此时第二晶体管的第一端和第二端短路,补偿驱动模块把第二电源写进驱动晶体管的栅极;52, 补偿过程:第一扫描端控制第三晶体管导通和第四晶体管导通,驱动晶体管呈二极管接法,此时第一晶体管、第二晶体管以及第五晶体管处于关断状态;数据电压耦合模块把数据电压写在存储电容连接于第二节点的一端,补偿驱动模块把驱动晶体管的阈值电压写在存储电容连接于第一节点的一端;53, 发光显示过程:发光控制端控制第一晶体管和第五晶体管导通,第二晶体管、第三晶体管以及第四晶体管处于关断状态,存储电容中存储数据电压耦合至驱动晶体管的栅极,此时驱动晶体管受控于发光控制端将所述驱动电压转 A suitable method of driving the pixel. 3 0LED 0LED pixel compensation circuit as claimed in claim, characterized by comprising the steps of: Sl, the reset process: scanning a second control terminal of the second transistor, the second transistor at this time the first and second ends of the short circuit, the compensation drive module written to the second power supply gate driving transistor; 52, compensation process: scanning a first end of the control is turned on and the fourth transistor, a third transistor as a drive transistor diode-connected, while the first transistor, a second transistor and a fifth transistor in an off state; module coupled to the data voltage in the data write voltage end of the storage capacitor is connected to the second node, the driving module compensating threshold voltage of the driving transistor written in the end of the storage capacitor is connected to the first node; 53, the light emitting display process: a first light emission control terminal of the control transistor and the fifth transistor is turned on, the second transistor, a third transistor and a fourth transistor in the oFF state, the storage capacitor storing data coupled to the gate voltage of the driving transistor, the driving transistor being controlled at this time the light emission control terminal of the driving voltage revolutions 换为驱动有机发光二极管发光的驱动电流。 Driving current to change the organic light emitting diode emits light.
10.如权利要求9所述的OLED像素驱动方法,其特征在于:任意时刻所述第一扫描端和所述第二扫描端的输出电压至少有一个为高电平。 10. The OLED pixel driving method according to claim 9, wherein: said first scanning time any terminal and an output terminal voltage of the second scan at least a high level.
11.如权利要求9所述的OLED像素驱动方法,其特征在于:OLED像素补偿电路处于发光显示过程时,所述存储电容两端的电压保持不变。 11. The OLED pixel driving method according to claim 9, wherein: when the OLED light emitting display pixel compensation circuit is in process, the voltage across the storage capacitor remains unchanged.
12.如权利要求9所述的OLED像素驱动方法,其特征在于:驱动有机发光二极管发光的电流为数据信号端电压的函数,并且所述电流与驱动晶体管的阈值电压以及第一电源的电压无关。 12. The OLED pixel driving method according to claim 9, wherein: the organic light emitting diode drive current as a function of the data signal terminal voltage and the current threshold voltage of the driving transistor and the first power source independent of .
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