Liquid Crystal Driving Circuit for Flicker Reduction
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Solution Overview
Problem
In liquid crystal display devices using vertical alignment mode, the difference in common voltages between main and sub pixels leads to scrambled images and flickering, affecting display quality.
Innovation Solution
A liquid crystal driving circuit with additional electrical switches and capacitors is introduced to ensure synchronized charging and discharging of both main and sub pixels, particularly enhancing the discharging ability during negative half cycles to equalize common voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a 3T driving circuit is applied to achieve low color shifting, then color shift is reduced, but the common voltages of main pixel and sub pixel become inconsistent resulting in scrambled images and flickering
Solution Approach 1:
The pixel is divided into main pixel and sub pixel regions with different capacitor configurations. The main pixel has capacitors C1 and C2 while the sub pixel has capacitors C3 and C4, allowing independent voltage control for each region to achieve both color shift reduction and image stability
Solution Approach 2:
Different capacitor arrangements are applied to different regions of the pixel. The main pixel uses a specific capacitor configuration while the sub pixel uses a different configuration, creating local quality differences that enable simultaneous achievement of low color shift and stable common voltage
2Reliability
If additional electrical switches and capacitors are added to equalize common voltages, then image stability is improved, but device complexity increases
Solution Approach 1:
The fourth electrical switch T4 is configured to control multiple capacitors (C3 and C4) simultaneously, and the fifth electrical switch T5 provides a shared discharge path. This merging approach allows voltage equalization with fewer additional components compared to independent control of each capacitor
Solution Approach 2:
The fourth electrical switch T4 serves multiple functions: it controls the discharge of capacitor C3, controls the discharge of capacitor C4, and works in conjunction with T5 to equalize common voltages. This multi-functionality reduces the need for separate dedicated components for each function
Data Source
AI summary
The present invention provides a liquid crystal driving circuit for providing power to the pixel units of a liquid crystal display device. The present invention further provides the liquid crystal display device, which comprises pixel units and the liquid crystal driving circuit.