Pixel circuit, driving method thereof, and display panel

Abstract

The application discloses a pixel circuit, a driving method thereof, and a display panel. The pixel circuit includes: a driving unit connected between the first power supply and the second power supply; a control unit connected to the driving unit for controlling the switching state of the driving unit; a light emitting unit connected to the first power supply via the driving unit to emit light The light emitting state of the unit is at least controlled by the switching state of the driving unit; and the antifuse is connected in series in the circuit structure formed by the second power supply and the driving unit, and is used to control the current path between the second power supply and the driving unit, wherein, In the repair mode, the voltage difference between the first power supply and the second power supply causes the antifuse to switch from a high resistance state to a low resistance state, thereby conducting a current path from the light emitting unit to the second power supply, so that the light emitting unit stops emitting light. The pixel circuit realizes bright spot repair by using anti-fuse, which improves the yield, accuracy and efficiency of bright spot repair.

Description

technical field [0001] The present invention relates to the field of display technology, and more particularly, to a pixel circuit, a driving method thereof, and a display panel. Background technique [0002] Organic Light-Emitting Diode (OLED) is a new type of display device developed in the mid-20th century. OLED has many advantages such as ultra-thin, all-solid-state, active light-emitting, fast response speed, high contrast ratio, no viewing angle limit, wide operating temperature range, low power consumption, low cost, strong shock resistance and flexible display. Dream Display". The superior performance and huge market potential of OLED displays have attracted many manufacturers and scientific research institutions around the world to invest in the production and research and development of OLED devices. [0003] Due to the development of AMOLED (Active Matrix Organic Light Emitting Diode), large-size OLED displays usually use TFT (Thin Film Transistor) to drive the ...

AI Technical Summary

Problems solved by technology

This method requires high control of laser energy. Excessively high energy will cause serious thermal impact, and the thermal stress generated by gasification will be difficult to release, causing film defects.

Since OLED devices have extremely high requirements on the compactness of the encapsulation layer, this method may even easily cause damage to the encapsulation layer, resulting in irreversible damage

Too low energy will cause a small part of the organic functional layer to remain, and the change of film thickness and composition will cause the voltage to increase, resulting in an abnormal increase in the brightness of the device, which further intensifies the brightness of the bright spot.

The existing laser repair process can only be applied to large-size OLED panels. For micro-OLED devices, the pixel size reaches the micron level, and the distance between pixels may be less than 1um. Due to the processing accuracy of laser repair equipment, spot size, optical The influence of diffraction and other problems on this scale is more and more obvious. In actual production, the stability of the isolation method and the front-end process is a key issue.

Further, laser repair depends on laser repair equipment, which is expensive

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