Gate Drive Circuit Flicker Prevention via Cut-Off Control
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Solution Overview
Problem
Existing display technologies suffer from screen flickering during the power-on period due to electric leakage and unintended activation of thin-film transistors (TFTs) in liquid crystal displays, leading to premature light emission and visual defects.
Innovation Solution
A circuit and method that control the gate drive circuit to output a gate cut-off level during the power-on period by utilizing a noise reduction module, where the noise reduction voltage signal is set to a turn-on level, and an external input voltage signal is used to ensure the TFTs remain in a cut-off state, preventing screen flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display panel is powered on, then the display should start operating, but screen flickering occurs due to electric leakage and unintended TFT activation
Solution Approach 1:
The patent applies preliminary anti-action by introducing a gate cut-off level that is applied before normal display operation begins. This cut-off level prevents electric leakage and unintended TFT activation during the power-on period, thereby preventing screen flickering before it can occur. The gate cut-off level acts as a preventive measure that counteracts the harmful effects of electric leakage at the earliest stage.
Solution Approach 2:
The patent implements preliminary action by controlling the gate drive circuit to output the gate cut-off level during the power-on period before normal display operations start. This preliminary control ensures that TFTs remain in a stable cut-off state, preventing electric leakage accumulation that would otherwise cause screen flickering during subsequent operation.
2Ease of operation
If the gate drive circuit operates normally, then display functions work, but TFTs unintendedly activate during power-on causing premature light emission
Solution Approach 1:
The gate cut-off level serves as a preliminary anti-action mechanism that prevents unintended TFT activation during the power-on period. By maintaining this cut-off level before normal operation begins, the patent prevents premature light emission caused by electric leakage, ensuring that display operations only commence when TFTs are properly activated through normal control signals.
3Object-generated harmful factors
If noise reduction module is activated, then output level is pulled to gate cut-off level, but requires additional control signals
Solution Approach 1:
The patent merges the power-on control function with the noise reduction function by using the same gate cut-off level for both purposes. The noise reduction module, which is designed to pull the output level to the gate cut-off level, is activated during the power-on period to simultaneously achieve power-on control and electric leakage prevention, thereby reducing the need for separate control mechanisms.
Data Source
AI summary
Circuit and method for preventing screen flickering, a drive circuit for a display panel, and a display apparatus are provided, relating to the field of display technology. The circuit for preventing screen flickering includes a control sub-circuit configured to control a gate drive circuit of the display panel to output a gate cut-off level during a power-on period of the display panel. The gate drive circuit of the display panel is controlled to output the gate cut-off level during the power-on period, the gate cut-off level is provided to gate lines of the display panel such that TFTs connected to the gate lines are in cut-off state during the power-on period.