Pixel circuit, driving method thereof, and display device
A technology of pixel circuits and driving transistors, applied in static indicators, instruments, etc., can solve the problems of poor brightness uniformity of OLEDs, increase in turn-on voltage, and reduce luminous brightness, and achieve the effect of improving brightness uniformity.
Active Publication Date: 2019-12-17
BOE TECH GRP CO LTD +1
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Problems solved by technology
[0004] However, due to the existing low-temperature polysilicon process, the threshold voltage Vth of each driving transistor DTFT on the display substrate has poor uniformity and drifts during use. When the same data voltage Vdata is input to the drive transistor DTFT, different drive currents are generated due to different threshold voltages of the drive transistor DTFT, which results in poor uniformity of OLED brightness in the display device.
[0005] In addition, as the use time increases, the OLED will produce its own loss, and the conduction voltage of the OLED will increase. When the driving current input to the OLED remains unchanged, the actual current flowing in the OLED will decrease, and the OLED’s The actual luminous brightness decreases, and the display quality of the display device decreases
Method used
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Embodiment 2
[0056] image 3 A schematic circuit structure diagram of a pixel circuit provided in Embodiment 2 of the present invention, as shown in image 3 As shown, the pixel circuit is based on figure 2 An embodiment of the pixel driving circuit shown.
[0057] Wherein, optionally, the conduction voltage acquisition unit 1 includes: a first transistor T1, a second transistor T2, a third transistor T3 and a first capacitor C1;
[0058] The control electrode of the first transistor T1 is connected to the first control signal line EN1, the first electrode is connected to the second electrode of the driving transistor DTFT and the first electrode of the light emitting device OLED, and the second electrode is connected to the first end of the first capacitor C1 , the first electrodes of the third transistor T3 are all connected;
[0059] The control pole of the second transistor T2 is connected to the first control signal line EN1, the first pole is connected to the second terminal of t...
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A pixel driving circuit and a driving method therefor are provided. The pixel driving circuit includes a turn-on voltage acquiring device, a compensation device, a light-emitting controller, a data writing device, a driving transistor and a light emitting device. The turn-on voltage acquiring device acquires a turn-on voltage of the light emitting device and generates a compensation signal according to the turn-on voltage; the data writing device provides a data voltage to the gate of the driving transistor; the light-emitting controller provides a first operating voltage to a first electrode of the driving transistor; and the compensation device generates a control signal according to the compensation signal, the data voltage and the threshold voltage of the driving transistor and provides the control signal to the gate of the driving transistor; the driving transistor outputs a driving current to the light emitting device.
Description
technical field [0001] The present invention relates to the field of display technology, in particular to a pixel circuit, a driving method thereof, and a display device. Background technique [0002] An active matrix organic light emitting diode panel (Active Matrix Organic Light Emitting Diode, AMOLED for short) is more and more widely used. The pixel display device of AMOLED is an Organic Light-Emitting Diode (OLED for short). AMOLED can emit light by driving a thin film transistor to generate a driving current in a saturated state, and the driving current drives the OLED to emit light. [0003] figure 1 It is a schematic structural diagram of a basic pixel driving circuit in the prior art, such as figure 1 As shown, the existing basic pixel driving circuit adopts a 2T1C circuit, and the 2T1C circuit includes two thin film transistors (switching transistor T0 and driving transistor DTFT) and a storage capacitor C. [0004] However, due to the existing low-temperature p...
Claims
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IPC IPC(8): G09G3/3225
CPCG09G3/3225G09G3/3233G09G2300/0814G09G2300/0819G09G2320/045G09G3/3258
Inventor 凌杰刘锋王文坚罗良明
Owner BOE TECH GRP CO LTD