Pixel circuit and display panel

Abstract

The invention discloses a pixel circuit and a display panel. The pixel circuit comprises a driving module, a bypass module and a light emitting device. The driving module is used to input driving current to the input end of the light emitting device to drive the light emitting device to emit light. The bypass module is connected between the input end and the output end of the light emitting device, and is used to shunt the driving current input by the driving module to the light emitting device. The off-state voltage of the driving module can be set to be smaller, so that the driving module in a dark state can output trace current to protect response time, improve response speed and improve a hysteresis effect. The bypass module is connected between the input end and the output end of the light emitting device, and then the current through the light emitting device is small through the shunt of the bypass module. The brightness of the light emitting device in a dark state is dark enough to ensure that the dark state display brightness of the display panel.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel circuit and a display panel. Background technique [0002] With the advancement of display technology, Organic Light Emitting Diode (OLED) is one of the hotspots in the field of flat panel display research today, and more and more Active Matrix Organic Light Emitting Diode (AMOLED) display Panels have entered the market. Compared with traditional thin film transistor liquid crystal display panels (Thin Film Transistor Liquid Crystal Display, TFT LCD), AMOLED has faster response speed, higher contrast ratio and wider viewing angle. [0003] However, it is found through testing the OLED display screen that the response speed of the OLED display screen is poor when jumping from a dark state display picture to a bright state display picture. This is because the off-state voltage of the drive transistor that drives the OLED to emit light in the off-state is relativel...

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Problems solved by technology

[0003] However, by testing the OLED display screen, it is found that the response speed of the OLED display screen is poor when jumping from the dark state display screen to the bright state display screen

This is because the off-state voltage of the drive transistor that drives the OLED to emit light in the off-state is relatively large (in order to ensure the contrast of the display screen, the off-state voltage needs to be set relatively high so that the drive transistor is in a completely cut-off state), so when the display When the screen jumps from the dark state to the bright state, the driving transistor will experience a short-term threshold voltage drift, resulting in poor response speed and hysteresis effect

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