Pixel circuit, driving method thereof and display panel

Abstract

The invention discloses a pixel circuit, a driving method thereof and a display panel, which are used for reducing the complexity of the circuit. The pixel circuit comprises a pixel driving circuit and an ultrasonic line identification circuit. The pixel driving circuit and the ultrasonic line identification circuit are coupled to the same power supply end, the first control end and the scanning signal end. The ultrasonic line recognition circuit is coupled with the ultrasonic device, and the pixel driving circuit is coupled with the data signal end and the light emitting device; in the firststage, under the control of the first control end, the ultrasonic grain recognition circuit provides an ultrasonic transmitting signal for the ultrasonic device, the pixel driving circuit performs threshold voltage compensation under the control of the first control end and the scanning signal end; in the second stage, under the control of the first control end and the scanning signal end, the ultrasonic line recognition circuit outputs a line recognition signal according to the received ultrasonic signal, and the pixel driving circuit writes in a data signal; and in the third stage, the pixeldriving circuit drives the light-emitting device to emit light under the control of the first control end and the scanning signal end.

Description

technical field [0001] The present application relates to the field of display technology, in particular to a pixel circuit, a driving method thereof, and a display panel. Background technique [0002] Fingerprint recognition is a biometric method. In recent years, with the rapid development of technology, fingerprint recognition has been widely used in smart phones, security equipment and other fields. Currently common fingerprint identification schemes include optical, capacitive and ultrasonic. Ultrasonic fingerprint recognition has attracted much attention due to its characteristics of good penetration, high accuracy, underwater unlocking and living body recognition. [0003] In the current existing technologies on the market, one of the ultrasonic fingerprint sensors is installed in the form of a plug-in module attached to the display panel, which has an independent display area circuit and logic circuit structure. This not only increases the overall thickness of the ...

AI Technical Summary

Problems solved by technology

However, the circuits in the display area (AA area) and the driving circuit (GOA) area are complex, and it is difficult to achieve high pixel density (PPI) and narrow borders

[0004] To sum up, in the display products of the prior art, there is a problem of poor integration between the fingerprint recognition driving circuit and the pixel driving circuit, which makes the circuit very complicated.

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