Pixel circuit and driving method of pixel circuit

Abstract

Embodiments of the present invention provide a pixel circuit and a driving method for the pixel circuit. In one embodiment, the pixel circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a first scanning signal line, a second scanning signal line, a data signal line, a control signal line, a capacitor, a power supply and LEDs. The source of the first transistor is connected to the first plate of the capacitor, the drain of the first transistor is connected to the source of the second transistor; the second plate of the capacitor is connected to the third transistor The drain of the second transistor is connected to the gate of the fourth transistor, and the source of the second transistor is connected to the data signal line; the source of the third transistor is connected to the power supply connected, the drain of the third transistor is connected to the source of the fourth transistor; the drain of the fourth transistor is connected to the light emitting diode; the cathode of the light emitting diode is grounded.

Description

technical field [0001] The present invention relates to the technical field of driving pixels of displays, in particular to a pixel circuit and a method for driving the pixel circuit. Background technique [0002] AMOLED display technology is gradually replacing traditional display technology (such as liquid crystal display) due to its advantages such as wide color gamut, wide viewing angle, high contrast ratio, and low power consumption. In the AMOLED display screen, the pixel circuit, as a signal control circuit of the pixel point, plays an important role in the display panel. The current mainstream LTPS process, due to the defects of the process itself, causes the problem of uneven voltage threshold (Vth) in the pixel circuit, so the pixel circuit mainly compensates for Vth. For high PPI products (such as microdisplays), due to the pixel layout space Smaller, the line width of the pixel circuit layout is narrowed, the voltage drop of the power supply voltage is increased...

AI Technical Summary

Problems solved by technology

The current mainstream LTPS process, due to the defects of the process itself, causes the problem of uneven voltage threshold (Vth) in the pixel circuit, so the pixel circuit mainly compensates for Vth. For high PPI products (such as microdisplays), due to the pixel layout space Smaller, resulting in the narrowing of the line width of the pixel circuit layout, resulting in an increase in the voltage drop of the power supply voltage, resulting in inconsistent writing of the screen signal of the display screen, resulting in uneven display

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