Liquid Crystal Driving Circuit Partial Drive Degradation
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Solution Overview
Problem
The partial drive method for liquid crystal display devices using amorphous silicon transistors faces degradation issues due to continuous gate voltage application, leading to threshold value variations and abnormal operation, which limits the long-term reliability of the GOG circuit.
Innovation Solution
A liquid crystal driving circuit is designed with a first shift register that outputs an enable signal to selectively drive target lines, and a separate driving means, such as a transistor switch or second shift register, to provide line drive signals, reducing the time high voltage is applied to the transistor gates, thereby minimizing degradation and extending the circuit's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If continuous gate voltage is applied to enable partial drive in GOG circuits, then partial driving capability is achieved, but transistor degradation accelerates and threshold value varies
Solution Approach 1:
The patent implements periodic action by using a shift register to sequentially activate enable signals for different pixel rows at specific time intervals. Instead of continuous gate voltage application, the enable signal is pulsed periodically to coincide with scan signal activation, allowing partial drive functionality while minimizing transistor stress and degradation.
2Reliability
If separate driving means is introduced to reduce high voltage application time, then transistor degradation is minimized, but device complexity increases
Solution Approach 1:
The patent merges the enable signal generation and line drive signal generation into an integrated driving circuit architecture. The shift register generates enable signals that are combined with scan signals through transistor switching, creating a unified control mechanism that reduces high voltage application time without requiring completely separate driving circuits, thus balancing reliability improvement with acceptable device complexity.
Data Source
AI summary
A liquid crystal drive circuit in which the degradation of the element is minimized in partial drive even for the GOG circuit configured by amorphous silicon, and a liquid crystal display device including the same are provided. The liquid crystal driving circuit includes a first shift register and a driving means. The first shift register advances through the line address of a pixel array to display an image, and outputs an enable signal only to drive the display target line. The driving means outputs a line drive signal corresponding to the enable signal to drive the line enabled by the first shift register.