CN102222468A - Alternating-current pixel driving circuit and method for active organic light-emitting diode (OLED) display - Google Patents

Alternating-current pixel driving circuit and method for active organic light-emitting diode (OLED) display Download PDF

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CN102222468A
CN102222468A CN2011101705773A CN201110170577A CN102222468A CN 102222468 A CN102222468 A CN 102222468A CN 2011101705773 A CN2011101705773 A CN 2011101705773A CN 201110170577 A CN201110170577 A CN 201110170577A CN 102222468 A CN102222468 A CN 102222468A
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transistor
light emitting
connected
organic light
oled
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CN2011101705773A
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吴为敬
周雷
张立荣
彭俊彪
王磊
许伟
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华南理工大学
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Abstract

The invention discloses an alternating-current pixel driving circuit and method for an active organic light-emitting diode (OLED) display. The driving circuit comprises a driving transistor, a switch transistor, a storage capacitor and an OLED, wherein the drain of the first transistor is connected with a data wire; the grid of the first transistor is connected with a first scanning control wire; the source of the first transistor is connected with the end A of the storage capacitor; the drain of a second transistor is connected with the source of a third transistor; the grid of the second transistor is connected with the end A of the storage capacitor and the source of the first transistor; the source of the second transistor is connected with the drain of a four transistor and the end B of the storage capacitor, and is connected with the ground through the OLED; the drain of the third transistor is connected with a power wire; the grid of the third transistor is connected with a light-emitting control wire; the grid of the fourth transistor is connected with a second scanning control wire; and the source of the fourth transistor is connected with a reference potential. According to the driving circuit and method, the OLED works in an alternating-current driving mode, so that the characteristics of the OLED are recovered from degeneration state, the service life of the OLED is prolonged effectively, the threshold voltage drift of a thin film transistor and the degeneration of OLED cut-in voltage can be compensated effectively, and the uniformity of a display picture is enhanced.

Description

有源有机发光二极管显示器交流像素驱动电路及驱动方法 AC active organic light emitting diode display and a driving method of a pixel driving circuit

技术领域 FIELD

[0001] 本发明涉及发光二极管显示器的像素驱动技术,尤其涉及有源有机发光二极管显示器交流像素驱动电路及驱动方法。 [0001] The present invention relates to a pixel driving technique light emitting diode display, more particularly to a circuit and method for driving an organic light emitting diode display active pixel driving AC.

背景技术 Background technique

[0002]有源矩阵有机发光二极管显示器(Active-Matrix Organic Light Emitting Diode =AMOLED)具有体积小、结构简单、自主发光、亮度高、可视角度大、响应时间短等优点,吸引了广泛的注意。 [0002] The active matrix organic light emitting diode display (Active-Matrix Organic Light Emitting Diode = AMOLED) having a small volume, simple structure, self-emission, high brightness, viewing angle, a short response time, etc., attracted widespread attention .

[0003] 目前,应用于AMOLED显示的薄膜晶体管主要有非晶硅薄膜晶体管(a_Si:H TFT) 和多晶硅薄膜晶体管(Poly-Si TFT)。 [0003] Currently, the thin film transistor is applied to an AMOLED display are mainly amorphous silicon thin film transistor (a_Si: H TFT) and a polysilicon thin film transistor (Poly-Si TFT). 然而,由于非晶硅材料的亚稳定性,a_Si:H TFTs的阈值电压因电应力的作用而随时间发生严重漂移。 However, due to the metastability of amorphous silicon material, a_Si: H TFTs threshold voltage electrical stress due to the action of serious drift over time. 由于多晶硅材料上晶粒间界的随机分布, Poly-Si TFTs的阈值电压在像素之间分布不均勻,导致显示区域灰阶不均勻。 Because of the random distribution of the grain boundaries of the polysilicon material, Poly-Si TFTs in the threshold voltage between the pixel uneven distribution, resulting in non-uniform gray display area. 逐渐成为研究热门的氧化锌基TFT和有机TFT也有类似的阈值电压漂移的问题。 Study becoming popular zinc oxide-based TFT and the organic TFT has a similar problem of threshold voltage drift. 因此,传统的两个晶体管一个电容0T1C)像素电路结构不适合高质量的AMOLED显示。 Thus, the conventional two transistors a capacitor 0T1C) circuit configuration of the pixel is not suitable for high-quality AMOLED display. 此外,还需考虑OLED的特性退化,OLED的退化会引起自身开启电压的升高,从而引起显示屏亮度的下降。 Further, the need to consider deterioration of characteristics of the OLED, the OLED itself caused degradation open voltage increases, causing a decline in screen brightness. OLED的特性退化可具体表述为:一从电学特性上,OLED两端加载相同的电压流过OLED的电流减小; 二从光学特性上,OLED流过一样的电流发光亮度下降。 OLED degradation characteristics can be specifically expressed as: electrical properties from one ends of the same OLED load voltage decreases the current flowing through the OLED; from the two optical properties, as the current flowing through the OLED emission luminance drop. 当OLED器件制备出来后,器件结构、 有机材料、电极材料及制备工艺已经确定,驱动方式将对OLED的可靠工作产生重要影响, 选择良好的驱动方式有助于延长OLED的工作寿命。 When the OLED device prepared out, the device structure, organic materials, electrode materials and preparation has been determined, will have important effects driving method of the OLED reliable operation, good driving mode selection helps to extend the working life of the OLED. 有诸多文献(如:1. SA Van Slyke, CH Chen and CW Tang, App 1. Phys. Lett.,69 (15),Oct. 1996 :2160-2162 ;2. D. Zou, Μ. Yahiro and Τ. Tsutsui, Jpn. J. Appl. Phys. , Vol. 37(1998) :L1406-L1408 ;3. D. Zou, Μ. Yahiro and Τ. Tsutsui,Appl. Phys. Lett. ,72(19) ,May 1998 :2484-2486.)指出,包含一反向偏置分量的脉冲驱动方式可有效提高OLED的工作寿命,这就是OLED的交流驱动方式。 There are many literature (eg: 1 SA Van Slyke, CH Chen and CW Tang, App 1. Phys Lett, 69 (15), Oct 1996:.... 2160-2162; 2 D. Zou, Μ Yahiro and Τ.. ... Tsutsui, Jpn J. Appl Phys, Vol 37 (1998): L1406-L1408; 3 D. Zou, Μ Yahiro and Τ Tsutsui, Appl Phys Lett, 72 (19), May........ 1998: 2484-2486) noted that a pulse drive mode comprises a reverse bias component can effectively improve the lifetime of the OLED, which is AC-driven approach of the OLED. OLED的反向偏置可以减少OLED中有机层的电荷累积,有助于OLED从退化中恢复过来,可改善OLED的电流-电压特性而提高能量利用效率,但是不会影响量子效率。 OLED reverse bias charge accumulation can be reduced in the organic layer OLED, OLED help recover from degradation in the OLED can improve the current - voltage characteristics improve energy efficiency, but does not affect the quantum efficiency.

[0004] 目前,大部分的AMOLED像素电路设计要么实现OLED的交流驱动以延缓OLED的特性退化从而提高其工作寿命,但未能补偿TFT阈值电压漂移和OLED特性退化;要么实现补偿TFT阈值电压漂移和OLED特性退化,但未实现OLED的交流驱动。 [0004] Currently, most of the AMOLED pixel circuits designed either to achieve AC driven OLED to characteristics retard OLED degradation thus increasing its working life, but failed to compensate for TFT threshold voltage drift and the OLED characteristic degradation; either implement the compensation TFT threshold voltage shift and OLED degradation characteristics, but did not realize the exchange of driving the OLED. 综合上述分析,一个比较理想的像素电路拓扑是在包含OLED的交流驱动方式基础上实现补偿TFT阈值电压漂移和OLED特性退化。 To achieve the threshold voltage shift compensation TFT and OLED degradation characteristics of the AC driving manner on the basis of the above analysis, a more desirable topology is a pixel circuit comprising an OLED.

发明内容 SUMMARY

[0005] 本发明的目的在于克服上述现有技术的缺点和不足,提供有源有机发光二极管显示器交流像素驱动电路及驱动方法。 [0005] The object of the present invention is to overcome the above disadvantages and drawbacks of the prior art, providing an active organic light emitting diode display pixel driving circuit and the AC driving method. 本发明交流像素驱动电路可促进有机发光二极管从退化中恢复特性,有效提高有机发光二极管的工作寿命,并且有效补偿有源有机发光二极管显示器中驱动晶体管的阈值电压漂移和发光二极管开启电压的退化,从而大大提高发光二极管显示器发光亮度的均勻性。 AC pixel of the present invention is the driving circuit may promote the organic light emitting diode recovery characteristic from degenerating, effectively improve the lifetime of the organic light emitting diode, and effective compensation of the active organic light emitting diode display drive transistor threshold voltage drift and the light emitting diode is turned on degradation voltage, thereby greatly improving the uniformity of emission luminance of a light emitting diode display.

[0006] 本发明的目的通过下述方案实现: [0006] The object of the present invention is achieved by the following scheme:

[0007] 有源有机发光二极管显示器交流像素驱动电路,所述驱动电路包括:第一晶体管、 第二晶体管、第三晶体管、第四晶体管、发光二极管;这些晶体管为多晶硅薄膜晶体管、非晶硅薄膜晶体管、氧化锌基薄膜晶体管或有机薄膜晶体管中的任意一种。 [0007] The organic light emitting diode display active AC pixel driving circuit, the driving circuit comprising: a first transistor, a second transistor, a third transistor, a fourth transistor, a light emitting diode; these transistors are polysilicon thin film transistor, an amorphous silicon film transistor, or zinc oxide-based thin-film transistor of any one of the organic thin film transistor.

[0008] 所述第一晶体管的漏极接数据线,栅极接第一扫描控制线,源极接存储电容的A 端,所述第一晶体管为数据电压写入到第二晶体管的栅极并存储于存储电容提供通路; A drain connected to the data line [0008] of the first transistor, a control gate connected to a first scan line, a source connected to the A terminal of the storage capacitor, the first transistor is a data voltage is written to the gate of the second transistor stored in the storage capacitor and the supply passage;

[0009] 所述第二晶体管漏极接第三晶体管的源极,栅极接存储电容的A端,源极接第四晶体管的漏极以及存储电容的B端,并通过有机发光二极管与地相连,所述第二晶体管驱动有机发光二极管发光; [0009] The source of the second transistor connected to the drain of the third transistor, A gate terminal of the storage capacitor, a source connected to the drain of the fourth transistor and the terminal B of the storage capacitor, and an organic light emitting diode and ground It is connected to the second transistor for driving the organic light emitting diode;

[0010] 所述第三晶体管漏极接电源线,栅极接发光控制线,所述第三晶体管为第二晶体管阈值电压存储提供充电通路并为驱动有机发光二极管发光提供通路; [0010] The drain of the third transistor connected to the power supply line, a gate connected to the emission control line, the third transistor providing a second path for charging the threshold voltage of the memory transistor and provides a pathway for driving the organic light emitting diode;

[0011] 所述第四晶体管栅极接第二扫描控制线,源极接参考电位,所述第四晶体管提供有机发光二极管放电通路使B点电位降至参考电位,促使有机发光二极管两端电压反向, 并避免有机发光二极管在特性恢复阶段发光。 [0011] The fourth transistor connected to the second scanning control gate line, a source connected to a reference potential, a discharge path to provide an organic light emitting diode of the fourth transistor so that the potential of the point B down to the reference potential, causes the voltage across the organic light emitting diode reverse, and avoiding organic light emitting diode emits light recovery phase characteristic.

[0012] 上述有源有机发光二极管显示器交流像素驱动电路的驱动方法,包括下列步骤: [0012] The method of driving an organic light emitting diode display of the active AC pixel driving circuit, comprising the steps of:

[0013] (1)特性恢复阶段:第一扫描控制线、交流驱动控制线处于高电平,发光控制线处于低电平,数据线置为地电位电平,第一晶体管和第四晶体管导通,第三晶体管关断,A点电位通过第一晶体管被重置为地电位电平,阳极存储的电荷放电直至其电位与参考电位相等;这时的阴极电位大于阳极电位,由此有机发光二极管两端实现反向偏置而使有机发光二极管处于特性恢复阶段,从而实现有源有机发光二极管像素的交流驱动。 [0013] (1) recovery phase characteristics: a first scanning control line, the control line AC driving at a high level, the light emission control line at a low level, the data line to a ground potential level, the first transistor and the fourth transistor through the third transistor is turned off, a point potential through the first transistor is reset to the ground potential level, the stored charge is discharged until the anode potential thereof is equal to the reference potential; at this time is larger than the anode potential of the cathode potential, whereby the organic light emitting a reverse bias across the diodes to achieve the characteristics of the organic light emitting diode in the recovery phase, thereby realizing an active AC driven OLED pixels. 在此阶段,第三晶体管处于关断状态导致第二晶体管不能流过电流,因而不会影响有机发光二极管阳极的放电。 At this stage, the third transistor is in an off state causes the second transistor current can not flow, and thus will not affect the discharge of the anode of the OLED.

[0014] (2)阈值电压存储阶段:第一扫描控制线保持原来的高电平,交流驱动控制线跳至低电平,发光控制线跳至高电平,数据线和A点电位维持为地电位电平,第一晶体管和第三晶体管处于导通状态,第四晶体管处于关断状态,电源通过第三晶体管、第二晶体管对有机发光二极管阳极B点进行充电直到第二晶体管截止,此时,存储电容两端电压即为第二晶体管的阈值电压。 [0014] (2) storing a threshold voltage phases: a first scanning control line to maintain the original high level, a low level AC driving control lines jump, high jump emission control line, and the data line is maintained at the potential of the point A potential level, the first transistor and the third transistor in the on state, the fourth transistor is in an off state, the power supply through the third transistor, a second transistor pair anode of the OLED point B is charged until the second transistor is turned off at this time , the voltage across the storage capacitor is the threshold voltage of the second transistor.

[0015] (3)数据电压写入阶段:第一扫描控制线为高电平,交流驱动控制线和发光控制线为低电平,第一晶体管处于导通状态,第三晶体管和第四晶体管处于关断状态,数据电压通过第一晶体管写入到第二晶体管的栅极并由存储电容保持至下一帧更新。 [0015] (3) the data writing stage voltage: a first scanning control line is high, the AC control lines and drive the light emission control line is low, the first transistor is in the on state, the third and fourth transistors in the oFF state, writing data voltage through the first transistor to the gate of the second transistor by the storage capacitor is maintained to the next frame update.

[0016] (4)发光阶段:第一扫描控制线、交流驱动控制线为低电平,发光控制线为高电平,第一晶体管和第四晶体管处于关断状态,第三晶体管处于导通状态,第二晶体管驱动有机发光二极管发光,发光阶段第二晶体管的栅源电压保持不变,从而维持有机发光二极管在一帧时间内亮度不变直到下一帧图像刷新。 [0016] (4) the light emitting stages: a first scanning control line, the AC driving control line low, the light emission control line is high, the first and fourth transistors are in an off state, the third transistor is turned on state, the second transistor driving the organic light emitting diode emits light, the gate-source voltage of the emission phase of the second transistor is kept constant, thereby maintaining the luminance of the organic light emitting diode unchanged until the next frame in an image refresh time.

[0017] 本发明与现有技术相比,优点及效果在于:本发明提出的有源有机发光二极管显示器的交流像素驱动电路,在实现有源有机发光二极管交流驱动的同时,还可有效补偿晶体管阈值电压漂移和有机发光二极管开启电压退化,从而提高有源有机发光二极管显示器的显示画面亮度均勻性及其工作寿命。 [0017] Compared with the prior art, advantages and effects that: alternating pixels of the present invention proposed an active organic light emitting diode display driver circuits, while achieving an active organic light emitting diode driven by AC, may also be effective compensating transistor threshold voltage shift and the degradation of organic light emitting diode turn-on voltage, thereby improving the active organic light emitting diode display and a display screen brightness uniformity working life. 附图说明 BRIEF DESCRIPTION

[0018] 图1是本发明有源有机发光二极管显示器的交流像素驱动电路图; [0018] FIG. 1 is an alternating pixels of the active organic light emitting diode display drive circuit diagram;

[0019] 图2是图1的信号时序图。 [0019] FIG 2 is a signal timing diagram of FIG.

[0020] 其中:第一晶体管Tl、第二晶体管T2、第三晶体管T3、第四晶体管T4、存储电容Cs、第一扫描控制线Vscanl、交流驱动控制线VsCan2、发光控制线Vems、参考电位线Vref、 电源线Vdd、地线Vss、数据线Vdata、有机发光二极管OLED。 [0020] wherein: a first transistor Tl, a second transistor T2, third transistor T3, a fourth transistor T4, a storage capacitor Cs, a first control line scan Vscanl, AC driving control lines VsCan2, emission control line Vems, the reference potential line Vref, the power supply line Vdd, the ground line Vss, the data line Vdata, the organic light emitting diode OLED.

具体实施方式 Detailed ways

[0021] 下面结合实施例及附图对本发明作进一步详细说明,但本发明的实施方式不限于此。 [0021] further below in conjunction with the accompanying drawings and the detailed description of embodiments of the present invention will be, but the embodiment of the present invention is not limited thereto.

[0022] 实施例: [0022] Example:

[0023] 如图1所示,本发明有源有机发光二极管显示器的交流像素驱动电路图,包括第一晶体管Tl、第二晶体管T2、第三晶体管T3、第四晶体管T4、存储电容Cs、第一扫描控制线Vscanl、交流驱动控制线Vscan2、发光控制线Vems、电源线Vdd、地线Vss、参考电位线Vref、 数据线Vdata、有机发光二极管OLED (以下仅以OLED表示)。 AC pixel [0023] As shown, the present invention is an active organic light emitting diode display driving circuit diagram, comprising a first transistor Tl, a second transistor T2, third transistor T3, a fourth transistor T4, a storage capacitor Cs, a first scanning control lines Vscanl, AC driving control lines Vscan2, emission control lines Vems, the power supply line Vdd, the ground line Vss, the reference voltage line Vref, the data line Vdata, the organic light emitting diode OLED (hereinafter referred to merely OLED). 上述这些晶体管可以采用多晶硅薄膜晶体管、非晶硅薄膜晶体管、氧化锌基薄膜晶体管或有机薄膜晶体管中的任意一种。 These transistors may be employed polysilicon thin film transistor, any one of amorphous silicon thin film transistor, a zinc oxide-based thin-film transistor or organic thin film transistor.

[0024] 所述第一晶体管Tl的漏极接数据线Vdata,栅极接第一扫描控制线Vscanl,源极接存储电容Cs的A端,所述第一晶体管Tl为数据电压写入到第二晶体管T2的栅极并存储于Cs提供通路; A drain connected to the data line Vdata [0024] Tl of the first transistor, and a gate connected to the first scan control line Vscanl, then A source terminal of the storage capacitor Cs, the first transistor Tl is written to the second data voltage the gate of the second transistor T2 is stored in Cs and provides a path;

[0025] 所述第二晶体管T2漏极接第三晶体管T3的源极,栅极接存储电容Cs的A端,源极接第四晶体管T4的漏极以及存储电容的B端,并通过OLED与地相连,所述第二晶体管T2 驱动OLED发光; [0025] The second transistor T2 is connected to the drain of the third transistor T3, a source, a gate connected to terminal A of the storage capacitor Cs, a source connected to the drain of the fourth transistor T4 and the terminal B of the storage capacitor, and through the OLED connected to ground, the second OLED light emitting driving transistor T2;

[0026] 所述第三晶体管T3漏极接电源线Vdd,栅极接发光控制线Vems,所述第三晶体管T3为第二晶体管T2阈值电压存储提供充电通路并为驱动OLED发光提供通路; [0026] The drain of the third transistor T3 is connected to the power line Vdd, a gate connected to the emission control line Vems, the third transistor T3, the threshold voltage of the second transistor T2 to provide a charge path memory provides a pathway for the drive and for the OLED to emit light;

[0027] 所述第四晶体管T4栅极接交流驱动控制线VsCan2,源极接参考电位Vref,所述第四晶体管T4提供OLED放电通路使B点电位降至参考电位Vref,并避免OLED在特性恢复阶段发光。 [0027] The gate of the fourth transistor T4 is connected to the AC driving control lines VsCan2, a source connected to a reference potential Vref, the fourth transistor T4 provide an OLED discharge path so that the potential of the point B down to the reference potential Vref, and to avoid the OLED characteristic recovery phase light.

[0028] 像素驱动电路工作时,第一晶体管Tl、第三晶体管T3和第四晶体管T4均工作于线性区,起驱动作用的第二晶体管T2工作在饱和区。 When [0028] The pixel driving circuit, a first transistor Tl, the third transistor T3 and the fourth transistor T4 are operating in the linear region, drivingly second transistor T2 operates in a saturation region. 各信号线的输入时序如图2所示。 Input timing of each signal line as shown in FIG. 该像素驱动电路通过以下方法步骤实现: The pixel driving circuit is achieved by the following method steps:

[0029] (1)在特性恢复阶段,第一扫描控制线Vscanl、交流驱动控制线VsCan2处于高电平,发光控制线Vems处于低电平,数据线置为地电位电平Vss,第一晶体管Tl和第四晶体管T4导通,第三晶体管T3关断,A点电位通过第一晶体管Tl被重置为Vss,OLED阳极存储的电荷放电直至其电位与参考电位Vref相等;这时OLED的阴极电位Vss大于阳极电位Vref, 由此OLED两端实现反向偏置而使OLED处于特性恢复阶段,从而实现有源OLED像素的交流驱动。 [0029] (1) In the recovery phase characteristic, a first control line scan Vscanl, VsCan2 AC driving control lines at a high level, the light emission control line Vems at a low level, the data line is set to ground potential Vss level, the first transistor Tl, and the fourth transistor T4 is turned on, the third transistor T3 is turned off, a is reset to point potential Vss through the first transistor Tl, OLED anode discharge the stored charge until the reference potential Vref and the potential thereof equal; in this case the cathode of OLED greater than the anode potential Vref potential Vss, thereby reverse-biased to realize the ends OLED OLED is characteristic recovery phase, thereby realizing an active AC driven OLED pixels. 注意,在此阶段,第三晶体管T3处于关断状态导致第二晶体管T2不能流过电流,因而不会影响OLED阳极的放电。 Note that, at this stage, the third transistor T3 is in the off state causes the second transistor T2 is not a current flows, and thus does not affect the discharge of the anode of the OLED.

[0030] (2)在阈值电压存储阶段,第一扫描控制线Vscanl保持原来的高电平,交流驱动控制线VsCan2跳至低电平,发光控制线Vems跳至高电平,数据线和A点电位维持为地电位电平Vss,第一晶体管Tl和第三晶体管T3处于导通状态,第四晶体管T4处于关断状态,电源Vdd通过第三晶体管T3、第二晶体管T2对OLED阳极B点进行充电直到第二晶体管T2截止,此时,B点电位值为地电位电平减去第二晶体管T2的阈值电压Vth,即Vb = _Vth,则存储电容Cs两端电压即为第二晶体管T2的阈值电压。 [0030] (2) the threshold voltage storage phase, a first control line scan Vscanl maintain the original high level, the AC driving control lines VsCan2 jumps to low level, the light emission control line Vems jumps to high level, the data line, and the point A maintained at ground potential Vss potential level, the first transistor Tl and the third transistor T3 is in the oN state, the fourth transistor T4 is in the off state, the power supply Vdd through the third transistor T3, a second transistor T2 to the OLED anode point B the second transistor T2 is turned off until the charge, case, B is the ground potential point potential level minus the threshold voltage Vth of the second transistor T2, i.e., Vb = _Vth, the voltage across the storage capacitor Cs is the second transistor T2 threshold voltage.

[0031] (3)在数据电压写入阶段,第一扫描控制线Vscanl为高电平,交流驱动控制线VsCan2和发光控制线Vems为低电平,第一晶体管Tl处于导通状态,第三晶体管T3 和第四晶体管T4处于关断状态,数据电压Vdata通过第一晶体管Tl写入到第二晶体管T2的栅极并由存储电容Cs保持至下一帧更新;此时根据电容耦合效应B点电位为 [0031] (3) In the data write voltage phases, a first high scan control line Vscanl AC drive and control lines VsCan2 Vems low light emission control line, the first transistor Tl is in an ON state, the third transistor T3 and the fourth transistor T4 is in the off state, the data voltage Vdata is written to the gate of the storage capacitor Cs by the second transistor T2 is kept updated to the next frame by a first transistor Tl; capacitive coupling effect at this time point B potential

Figure CN102222468AD00061

[0032] (4)在发光阶段,第一扫描控制线Vscanl、交流驱动控制线VsCan2为低电平,发光控制线Vems为高电平,第一晶体管Tl和第四晶体管T4处于关断状态,第三晶体管T3处于导通状态,第二晶体管驱动OLED发光,发光阶段第二晶体管T2的栅源电压保持不变,从而维持OLED在一帧时间内亮度不变直到下一帧图像刷新。 [0032] (4) emission phase, a first control line scan Vscanl, VsCan2 AC drive control line is low, the light emission control line Vems high level, the first transistor Tl and the fourth transistor T4 is in an off state, the third transistor T3 is in the on state, the second transistor for driving the OLED to emit light emission phase of the second transistor T2 of the gate-source voltage kept constant, thereby maintaining the brightness of OLED unchanged until the next frame image in a refresh period.

[0033] 上述步骤(¾第二晶体管阈值电压的存储是通过对OLED充电直到第二晶体管T2 截止,存储电容Cs两端存储电压即为第二晶体管T2的阈值电压,在数据电压写入阶段,该像素驱动电路利用了OLED自身的大电容而使第二晶体管T2源端电位变化较小,可以减少外加电容的个数,节约了布线空间。 [0033] The above-described step (¾ stores the second transistor is the threshold voltage to the OLED through the second transistor T2 is turned off until the charge storage capacitor Cs is the voltage across the memory threshold voltage of the second transistor T2, the data voltage in the writing phase, the pixel driving circuit utilizes a large capacitance of the OLED itself the source terminal of the second transistor T2 is small potential changes, the number of external capacitors can be reduced, saving wiring space.

[0034] 在本发明的像素驱动电路中,各个像素点阈值电压Vth非均勻性或漂移不会影响 [0034] In the pixel driving circuit of the present invention, each pixel threshold voltage Vth of the non-uniformity or drift will not affect the

到发光器件OLED的亮度差异。 The difference in brightness of the light emitting device OLED. 发光器件OLED的亮度与流过其电流大小成正比。 Brightness light emitting device OLED is proportional to the current flowing through its size. 在数据电 In the electrical data

压写入阶段,对于各像素点,其存储电容Cs两端电压(即第二晶体管T2的栅源电压)已经 Pressure writing stage, for each pixel, which is the voltage across the storage capacitor Cs (i.e., gate-source voltage of the second transistor T2) has

Figure CN102222468AD00062

帧。 frame. 对于不同像素点,阈值电压的差异性会导致存储电容Cs两端的电压不同,但是由下面的公式可以推导出流过OLED的电流是相同的: For different pixels, the difference in threshold voltage leads to different voltages across the storage capacitor Cs, but by the following equation can be derived current flowing through the OLED is the same:

Figure CN102222468AD00063

其中A = -UnCox-, Ioled为发光阶段流过第二晶体管T2的电流,在其他参数不变 Wherein A = -UnCox-, Ioled for the current of the second transistor T2 flows through the emission phase, the other parameters constant

的情况下,其大小只与Vdata有关,而与Vth及OLED的导通电压无关。 In the case of which only the size of the related Vdata regardless of the ON voltage Vth and the OLED. 公式中,电子迁移率;Cra为单位面积的薄膜晶体管绝缘层电容;L和W分别为第二晶体管T2的有效沟道长度和宽度;Vth为第二晶体管T2的阈值电压;Vgs第二晶体管T2的栅源电压。 In the formula, the electron mobility; Cra per unit area of ​​the thin film transistor capacitor insulating layer; L and W respectively, the second transistor effective channel length and a width of T2; a threshold voltage Vth of the second transistor T2; Vgs of the second transistor T2 the gate-source voltage. [0039] 需要指出的是,欲在阈值电压存储阶段成功实现阈值电压的存储,须满足-Vref > Vth ;欲使像素电路在非发光阶段OLED不发光,OLED两端电压需低于其开启电压,故只需满 [0039] It is noted that, to be successful storage of the threshold voltage threshold voltage storage phase shall meet -Vref> Vth; non-light emitting pixel circuit purports stage OLED does not emit light, which must be less than the voltage across the OLED turn-on voltage , so just full

Figure CN102222468AD00064

足-& <V0led_th,Voled th是OLED的开启电压。 Foot - & <V0led_th, Voled th is the threshold voltage of the OLED. 这样的话,非发光阶段像素 In this case, the non-light-emitting pixel phase

Loled + Loled +

点可以实现全黑,从而大大提高了显示器的对比度。 Black spot can be realized, thus greatly improving the contrast of the display. 不论小分子发光二极管还是高分子发光二极管,其自身的单位面积电容约为25nF/cm2,对于一个典型的200um*100um发光面积而言,其电容值为5pF左右。 Whether a small molecule or polymer light emitting diode LED, its own capacitance per unit area of ​​approximately 25nF / cm2, for a typical 200um * 100um emitting area, the capacitance value of about 5pF. 而Cs电容值一般小于lpF。 Generally less than the value of Cs lpF. 在数据电压写入阶段,该像素驱动电路利用了OLED自身的大电容而使B点电位变化较小,因此上述条件很容易满足的。 In the data writing voltage phases, the OLED pixel drive circuit utilizes its large capacitance change is small the potential at the point B, so it is easy to satisfy the above conditions.

[0040] 当然,本领域技术人员还可以对本发明上述提出的像素驱动电路结构以及驱动方式作适当变更,例如适当变更像素电路各个开关晶体管的种类(P型或者N型),将各个晶体管的源极和漏极的电连接关系互换等。 [0040] Of course, the pixel driving circuit structure and a driving method skilled in the art can also be set forth above of the present invention will be suitably changed, for example, be changed to each type of the switching transistor of the pixel circuit (P-type or N-type), the source of each transistor and a drain electrode electrically connected relation swaps.

[0041] 如上所述便可较好的实现本发明。 The present invention can achieve a better [0041] described above.

[0042] 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。 [0042] The above-described embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention is not limited to the above embodiments, any other changes made to the spirit and principle of the present invention without departing from the next, modifications, substitutions , combined, simplified, should be equivalent replacement method, it is included within the scope of the present invention.

Claims (3)

1.有源有机发光二极管显示器的交流像素驱动电路,该驱动电路包括:第一晶体管、第二晶体管、第三晶体管、第四晶体管、存储电容、第一扫描控制线、交流驱动控制线、发光控制线、电源线、地线、参考电位线、数据线、有机发光二极管;所述第一晶体管的漏极接数据线,栅极接第一扫描控制线,源极接存储电容的A端,所述第一晶体管为数据电压写入到第二晶体管的栅极并存储于存储电容提供通路;所述第二晶体管漏极接第三晶体管的源极,栅极接存储电容的A端,源极接第四晶体管的漏极以及存储电容的B端,并通过有机发光二极管与地相连,所述第二晶体管驱动有机发光二极管发光;所述第三晶体管漏极接电源线,栅极接发光控制线,所述第三晶体管为第二晶体管阈值电压存储提供充电通路并为驱动有机发光二极管发光提供通路;所述第四 1. AC pixel driving circuit of an active organic light emitting diode display, the driving circuit comprising: a first transistor, a second transistor, a third transistor, a fourth transistor, a storage capacitor, a first scanning control line, the AC driving control lines, the light emitting control lines, power lines, ground reference potential line, a data line, the organic light emitting diode; a data line connected to the drain of the first transistor, a control gate connected to a first scan line, a source connected to the a terminal of the storage capacitor, said first transistor is a data voltage is written to the gate of the second transistor is stored in the storage capacitor and provides a path; source of the second transistor connected to the drain of the third transistor, a gate terminal of the storage capacitor, the source a drain electrode connected to terminal B of the fourth transistor and the storage capacitor, and is connected to the organic light emitting diode, the second transistor for driving the organic light emitting diode; the third transistor drain to the power line, a gate connected to the light emitting a control line, the third transistor of the second memory transistor threshold voltage to provide a charge path and provides a pathway for the drive of the organic light emitting diode; a fourth 体管栅极接交流驱动控制线,源极接参考电位,所述第四晶体管提供放电通路使B点电位降至参考电位,并避免在特性恢复阶段发光。 AC drive transistor connected to the gate control line, a source connected to a reference potential, provides a discharge path of the fourth transistor so that the potential of the point B down to the reference potential, and to prevent the recovery phase in the light emitting characteristics.
2.根据权利要求1所述的有源有机发光二极管显示器的交流像素驱动电路,其特征在于,所述第一晶体管、第二晶体管、第三晶体管、第四晶体管,为多晶硅薄膜晶体管、非晶硅薄膜晶体管、氧化锌基薄膜晶体管或有机薄膜晶体管中的任意一种晶体管。 The pixel of claim 1 AC active organic light emitting diode display driving circuit as claimed in claim, wherein said first transistor, a second transistor, a third transistor, a fourth transistor, a polysilicon thin film transistor, an amorphous silicon thin film transistor, a zinc oxide-based thin-film transistor or organic thin film transistor of any one transistor.
3.根据权利要求1至2所述的有源有机发光二极管显示器的交流像素驱动电路的驱动方法,其特征在于,包括下列步骤:(1)特性恢复阶段:第一扫描控制线、交流驱动控制线处于高电平,发光控制线处于低电平,数据线置为地电位电平,第一晶体管和第四晶体管导通,第三晶体管关断,A点电位通过第一晶体管被重置为地电位,有机发光二极管阳极存储的电荷放电直至其电位与参考电位相等;这时有机发光二极管的阴极电位大于阳极电位,由此有机发光二极管两端实现反向偏置而使有机发光二极管处于特性恢复阶段,实现有源有机发光二极管像素的交流驱动;在此阶段,第三晶体管处于关断状态导致第二晶体管不能流过电流,不会影响OLED阳极的放电;(2)阈值电压存储阶段:第一扫描控制线保持原来的高电平,交流驱动控制线跳至低电平,发光控制线跳 The driving method of the pixel 1 to the AC second active organic light emitting diode display driving circuit as claimed in claim, characterized in that it comprises the following steps: (1) recovery phase characteristics: a first scanning control line, the AC drive control line at a high level, the light emission control line at a low level, the data line to a ground potential level, the first transistor and the fourth transistor, the third transistor is turned off, A point potential through the first transistor is reset to ground potential, anode of the organic light emitting diode stored charge until the discharge potential is equal to the reference potential; cathode potential of the organic light emitting diode at this time is larger than the anode potential, whereby both ends of the organic light emitting diodes in the reverse biased diode is an organic light emitting characteristics recovery phase, to achieve an active AC driven OLED pixels; at this stage, the third transistor is in an off state causes the current flowing through the second transistor is not, does not affect the discharge of the anode OLED; (2) the threshold voltage of the memory stages: first scanning control line to maintain the original high level, a low level AC driving control lines jump, jump emission control line 高电平,数据线和A点电位维持为地电位电平,第一晶体管和第三晶体管处于导通状态,第四晶体管处于关断状态,电源通过第三晶体管、第二晶体管对阳极B 点进行充电直到第二晶体管截止,此时,存储电容两端电压即为第二晶体管的阈值电压;(3)数据电压写入阶段:第一扫描控制线为高电平,交流驱动控制线和发光控制线为低电平,第一晶体管处于导通状态,第三晶体管和第四晶体管处于关断状态,数据电压通过第一晶体管写入到第二晶体管的栅极并由存储电容保持至下一帧更新;(4)发光阶段:第一扫描控制线、交流驱动控制线为低电平,发光控制线为高电平,第一晶体管和第四晶体管处于关断状态,第三晶体管处于导通状态,第二晶体管驱动有机发光二极管发光,发光阶段第二晶体管的栅源电压保持不变,从而维持有机发光二极管在一帧时 High, the data lines and the potential of the point A is maintained at a ground potential level, the first transistor and the third transistor in the on state, the fourth transistor is in an off state, the power supply through the third transistor, a second transistor pair anode point B charging until the second transistor is turned off, this time, the voltage across the storage capacitor is the threshold voltage of the second transistor; (3) the data writing stage voltage: a first scanning control line is high, the AC driver and the light emitting control lines the gate by the storage control line is low, the first transistor is in the on state, the third and fourth transistors are in an off state, the data write voltage to the second transistor through the first transistor to the next holding capacitor frame update; (4) the light emitting stages: a first scanning control line, the AC driving control line low, the light emission control line is high, the first and fourth transistors are in an off state, the third transistor is turned on state, the second transistor driving the organic light emitting diode emits light, the gate-source voltage of the emission phase of the second transistor is kept constant, thereby maintaining the organic light emitting diode at a 内亮度不变直到下一帧图像刷新。 The constant luminance until the next frame refresh.
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