Display device and voltage regulation circuit

By dynamically controlling the common electrode voltage through a voltage regulation circuit, the problem of the common electrode voltage being higher than the gate drive voltage during the power-on and power-off processes of the display device is solved, ensuring normal deflection of liquid crystal molecules and improving the reliability of the display device and user experience.

CN121838679APending Publication Date: 2026-04-10SUZHOU CHINA STAR OPTOELECTRONICS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-02
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

During the power-on and power-off processes of the display device, the voltage of the common electrode is higher than the gate drive voltage, which causes the liquid crystal molecules to be unable to deflect normally or to stagnate, resulting in abnormal display images.

Method used

The voltage regulation circuit dynamically controls the common electrode voltage to keep it always below the gate drive voltage. It includes a generation module, a comparator module, and a control module. The target reference voltage is generated and compared with the measured common electrode voltage in real time. The control module pulls the common electrode voltage down in response to the target voltage signal.

Benefits of technology

It effectively prevents display abnormalities caused by abnormal voltage, improving the reliability of the display device and the user experience.

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Abstract

The invention provides a display device and a voltage regulation circuit, the display device comprises a display panel, a power management chip, a source driver and the voltage regulation circuit, the source driver is used for receiving a voltage signal output by the power management chip and driving liquid crystal molecules of pixel units in the display panel to deflect; the voltage regulation circuit comprises a generation module which is used for generating a target reference voltage according to the on-off state of a direct current voltage signal when a power-on or power-off signal of the display device is detected; the comparator module is used for comparing the target reference voltage with the measured common electrode voltage and outputting a target voltage signal; and the control module is used for responding to the target voltage signal and pulling down the common electrode voltage to be lower than the gate driving voltage. By dynamically controlling the common electrode voltage, it is ensured that the common electrode voltage is always lower than the gate driving voltage, the problem that the common electrode voltage is higher than the gate driving voltage in the startup and shutdown process of the display device is solved, and the display reliability and the user experience are improved.
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