Pixel circuit and display device

Abstract

The invention provides a pixel circuit and a display device, which belong to the technical field of display. The pixel circuit disclosed by the invention comprises a switching transistor, a drive transistor, a storage capacitor, a threshold voltage extraction unit, a light emission control unit, a light-emitting device, and a compensating unit; the light-emitting device is provided with a first pole connected to the second pole of the drive transistor and a second pole for receiving a first power voltage; the first end of the storage capacitor is connected to the control pole of the drive transistor, and the second end is connected to a reference voltage end; the switching transistor responds to a scanning signal, and is used for transmitting a data voltage signal to the first pole of thedrive transistor; the threshold voltage extraction unit responds to the scanning signal, and is used for being connected to the control pole and second pole of the drive transistor; the light emissioncontrol unit responds to a light emission control signal, and is used for transmitting a second power voltage to the first pole of the drive transistor; and the compensating unit is used for transmitting a compensating voltage to the second pole of the switching transistor in order to reduce the feed-through voltage of the switching transistor.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to a pixel circuit and a display device. Background technique [0002] figure 1 A known pixel circuit design is shown, the pixel circuit includes a light emitting device OLED, a switching transistor M2, a driving transistor M3, a storage capacitor Cst, a threshold voltage extraction transistor M4, and a first light emission control transistor M1; wherein, the switching transistor M2 Under the control of the scan signal, it is turned on to transmit the data voltage to the first pole of the driving transistor M3, but because the scan signal that controls the switch transistor M2 to be turned on and off is different, for example, the switch transistor M2 is a P-type transistor that controls its turn-on scan signal is low level, and the off-scanning signal is low level, therefore, in the switching process of high and low levels, a parasitic capacitance will be generated be...

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Problems solved by technology

[0002] figure 1 A known pixel circuit design is shown, the pixel circuit includes a light emitting device OLED, a switching transistor M2, a driving transistor M3, a storage capacitor Cst, a threshold voltage extraction transistor M4, and a first light emission control transistor M1; wherein, the switching transistor M2 Under the control of the scan signal, it is turned on to transmit the data voltage to the first pole of the driving transistor M3, but because the scan signal that controls the switch transistor M2 to be turned on and off is different, for example, the switch transistor M2 is a P-type transistor that controls its turn-on scan signal is low level, and the off scan signal is low level, therefore, in the switching process of high and low levels, a parasitic capacitance will be generated between the second pole and the control pole of the switching transistor M2, resulting in The second pole of the switch transistor M2 generates a feed-through voltage. At the same time, since the switch transistor M2 in the pixel circuit in the same row in the display panel is connected to the scan line Scan of the same row, in this way, due to the presence of Therefore, the voltage of the scan signal of the switching transistor M2 of the pixel circuit far away from the scan signal input end is smaller than the voltage of the scan signal of the switching transistor M2 of the pixel circuit close to the scan signal input end under the action of the resistance, thus causing the switching transistor M2 to be at high 1. During the low-level switching process, the parasitic capacitances generated between the second pole and the control pole of the switching transistor M2 at different positions are different in size, that is, the feedthrough voltages generated by the switching transistor M2 are different, which leads to different display on the display panel. Uniform

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