Alternating current pixel driving circuit and driving method of active organic electroluminescence displayer
A technology of a pixel driving circuit and a driving method, which is applied in the fields of pixel driving circuits and driving, AC pixel driving circuits and driving, can solve the problems of large turn-on voltage, poor reliability, affecting the current of OLED devices, etc., so as to prolong the life and improve the display. quality effect
Inactive Publication Date: 2013-04-03
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
However, this driving method is a two-transistor driving form. Since the threshold voltage drift of the amorphous silicon thin film transistor and the uneven threshold voltage of the polysilicon cannot be compensated, the brightness of the OLED display is uneven and the reliability is poor.
In addition, after the OLED device works for a long time, there will be a problem of device degradation, which will cause its turn-on voltage to increase, which will affect the current flowing through the OLED device, and then affect the brightness of the entire OLED display.
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Embodiment 1
[0043] Such as figure 1 As shown, the pixel driving circuit of this embodiment includes driving transistor T1, switching transistors T2~T4, storage capacitor Cs, scanning control lines Vcontrol1 and Vcontrol2, light-emitting scanning control line Vems, data line Vdata, power supply line Vdd, ground line Vss , a reference voltage line Vref and an organic light-emitting diode OLED;
[0044] The gate of the driving transistor T1 is connected to the drain of the switching transistor T2 and the A terminal of the storage capacitor Cs, and the source is connected to the B terminal of the storage capacitor Cs, the cathode of the organic light emitting diode OLED and the drain of the switching transistor T4 , the drain is connected to the source of the switching transistor T3;
[0045] The gate of the switching transistor T2 is connected to the scanning control line Vcontrol1, and the source is connected to the data line Vdata;
[0046] The gate of the switching transistor T3 is conn...
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The invention discloses an alternating current pixel driving circuit and a driving method of an active organic electroluminescence displayer. The circuit comprises a driving transistor T1, switch transistors T2-T4, a storage capacitor Cs, scanning control lines Vcontrol1 and Vcontrol2, a luminous scanning control line Vems, a data line Vdata, a power line Vdd, a ground wire Wss, a reference voltage wire Vref and an organic light emitting diode (OLED). The method comprises four stages: (1) a polarity-reversal stage of the OLED; (2) a threshold voltage latch stage of the driving transistor T1; (3) a gray-scale data voltage read-in stage; (4) an OLED light-emitting stage. The pixel driving circuit can effectively improve display quality of the OLED, improve contrast ratio of displaying devices, prolong service life of the OLED devices, and provide effective solutions for achieving large size of the OLED and high resolution displaying.
Description
technical field [0001] The invention relates to a pixel driving circuit and a driving method of a light-emitting display, in particular to an AC pixel driving circuit and a driving method of an active organic electroluminescent display. It belongs to the technical field of flat display. Background technique [0002] OLED (Organic Light-Emitting Diode), that is, organic light-emitting diode, because of its many advantages, such as active light without backlight, wide viewing angle, fast response speed, flexible display, etc., so OLED is known as a new generation of display . [0003] The drive mode of OLED display is divided into active drive (AMOLED) and passive drive (PMOLED). With the increase of screen size and resolution, the use of passive drive will cause many problems, such as shortened lifespan and poor reliability. [0004] Each pixel actively driven is equipped with a thin-film transistor (Thin-film-transistor, TFT) with switching function and a corresponding st...
Claims
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IPC IPC(8): G09G3/32G09G3/3225
Inventor 宋小锋吴为敬彭俊彪
Owner SOUTH CHINA UNIV OF TECH