A pixel circuit, a semiconductor camera detection circuit, and a display device

Abstract

The invention discloses a pixel circuit, a semiconductor camera detection circuit and a display device, which are used to solve the problem that there is a difference between the output current caused by the drift of the threshold voltage of the driving transistor and the current generated by actual illumination. The pixel circuit includes: a photodiode, a driving module, an initialization module, a transmission module, a voltage writing module and a compensation module; one end of the photodiode is grounded, and the other end is connected to the transmission module; the initialization module is used to convert the first Pull the voltage of a node to the initialization voltage; the transmission module is used to pull the voltage of the first node from the initialization voltage to the data voltage under the control of the first scan signal terminal; the voltage writing module is used to pull the voltage of the first node under the control of the second scan signal terminal , write the data voltage into the driving module, and output the ground voltage to the compensation module; the compensation module is used to perform threshold voltage compensation on the driving module under the control of the compensation signal terminal and the second scanning signal terminal.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a pixel circuit, a semiconductor camera detection circuit, and a display device. Background technique [0002] Complementary Metal-Oxide Semiconductor (CMOS) technology and its technology are widely used in the computer field. Active Pixel Sensor (APS) is the most common CMOS camera detection circuit. The APS pixel circuit The specific circuit diagram is as figure 1 shown. [0003] Such as figure 1 As shown, the APS pixel circuit is composed of a switching transistor T1, a switching transistor T3, a driving transistor T2 and a photodiode PD, and the driving transistor T2 is used as a source follower. At the beginning of exposure, the switching transistor T1 is turned on under the control of the initialization signal (Reset) input from the initialization signal terminal, and the photodiode PD is reverse-biased to the voltage Vrst, and the voltage Vrst charges the PN junction c...

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a pixel circuit, a semiconductor camera detection circuit, and a display device, which are used to solve the problem that there is a difference between the magnitude of the output current and the magnitude of the current generated by actual illumination due to the drift of the threshold voltage of the driving transistor

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