Pixel compensation circuit and display device
A compensation circuit and display device technology, applied to static indicators, instruments, etc., can solve problems such as easy drift, affect the image quality of the panel, and instability of the driving current of the organic light-emitting diode OLED, so as to improve the image quality of the panel and avoid current instability. stable effect
Inactive Publication Date: 2017-09-01
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, the organic light emitting diode OLED The driving current is unstable, which affects the panel quality
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[0035] 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, the first terminal of the first controllable switch T1 is connected to the first voltage terminal VDD, the control terminal of the first controllable switch T1 is connected to the light emitting control terminal EM;
[0036] 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 control terminal of the second controllable switch T2 end and the second end of the first controllable switch T1, the first end of the second controllable switch T2 receives the first reset signal SW;
[0037] The third controlla...
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The invention discloses a pixel compensation circuit and a display device. The control ends of first, third, fourth and fifth switches are connected with a light-emitting control end, a control signal and first and second scanning signals respectively. The control end of a second switch is connected with the second ends of the first and second switches. The control end of a driving switch is connected with the second end of the third switch, the first end of the driving switch is connected with the second end of the first switch, and the second end of the driving switch is connected with the second end of the fourth switch and the first end of the fifth switch. The second end of the fifth switch is connected with the anode of an organic light-emitting diode. The second end of the second switch is connected with the second end of the third switch through a first capacitor. A second resetting signal is received by the second end of the second switch through a second capacitor.
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. 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, whic...
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IPC IPC(8): G09G3/3208
CPCG09G3/3233G09G3/3208
Inventor 刘婕
Owner WUHAN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD