Pixel compensation circuit and display device
A compensation circuit and display device technology, applied in static indicators, instruments, etc., can solve problems such as easy drift, affect panel image quality, unstable organic light-emitting diode (OLED) driving current, etc., so as to avoid threshold voltage drift and improve panel image quality. qualitative effect
Active Publication Date: 2018-10-19
WUHAN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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Problems solved by technology
like figure 1 As shown, the basic driving circuit of the existing AMOLED display device includes a switching thin film transistor T1, a driving thin film transistor T2 and a storage capacitor Cst, the driving current of the organic light emitting diode OLED is controlled by the driving thin film transistor T1, and its current size is: I OLED =k(V gs -V th ) 2 , where k is the current amplification factor of the driving thin film transistor T1, which is determined by the characteristics of the driving thin film transistor T1 itself, and Vth is the threshold voltage of the driving thin film transistor T1. Since the threshold voltage Vth of the driving thin film transistor T1 is easy to drift, it may cause the organic light emitting diode The driving current of OLED is unstable, which affects the quality of the panel
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[0033] see figure 2 , is a schematic circuit diagram of the first embodiment of the pixel compensation circuit of the present invention. The pixel compensation circuit includes a first controllable switch T1, the first controllable switch T1 includes a control terminal, a first terminal and a second terminal, and the control terminal of the first controllable switch T1 is connected to the first light-emitting control terminal EM, the first terminal of the first controllable switch T1 is connected to the first voltage terminal VDD;
[0034] The second controllable switch T2, the second controllable switch T2 includes a control terminal, a first terminal and a second terminal, the control terminal of the second controllable switch T2 is connected to the second light-emitting control terminal EM_C, the second The first end of the controllable switch T2 is connected to the first end of the first controllable switch T1;
[0035] The third controllable switch T3, the third contro...
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A pixel compensation circuit and a display device. The control ends of first and second switches (T1, T2) in a pixel compensation circuit are respectively connected to first and second light-emitting control ends (EM, EM_C), and the first end of the first switch (T1) is connected to the first end of the second switch (T2); the control end of a third switch (T3) is connected to a first control signal (S_C), the first end thereof is connected to the second end of the first switch (T1), and the second end thereof is connected to the first end of a drive switch (T0); an anode of an organic light-emitting diode (D1) is connected to the second end of the drive switch (T0), and a cathode thereof is connected to a second voltage end (VSS); the control end and the first end of a fourth switch (T4) are respectively connected to a second control signal and a third control signal, and the second end thereof is connected to the control end of the drive switch (T0); a first capacitor (C1) is connected between the control end of the drive switch (T0) and the second end of the second switch (T2); and a second capacitor (C2) is connected between the second end of the second switch (T2) and the second end of the first switch (T1).
Description
technical field [0001] The invention relates to the field of display technology, in particular to a pixel compensation circuit and a display device. Background technique [0002] In the field of display devices, OLED display devices have strong competitiveness in the new generation of display devices due to their advantages such as wide color gamut, high contrast ratio, energy saving, and foldability compared with LCD display devices. In addition, AMOLED technology is one of the key development directions of flexible display. Such as figure 1 As shown, the basic driving circuit of the existing AMOLED display device includes a switching thin film transistor T1, a driving thin film transistor T2 and a storage capacitor Cst, the driving current of the organic light emitting diode OLED is controlled by the driving thin film transistor T1, and its current size is: I OLED =k(V gs -V th ) 2 , where k is the current amplification factor of the driving thin film transistor T1, w...
Claims
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IPC IPC(8): G09G3/3258
CPCG09G3/3233G09G3/3258
Inventor 毛鹏
Owner WUHAN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD