Multi-Domain LCD Panel Sub-Pixel Voltage Control
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Solution Overview
Problem
Conventional LCDs suffer from significant color differences and uneven brightness when viewed at large tilt angles, particularly in multi-domain LCDs, which affect the frame quality and viewing experience.
Innovation Solution
The implementation of a multi-domain LCD panel design with first and second sub-pixels, each equipped with storage capacitors and bias lines, where the bias line voltages are selectively changed to generate slightly different pixel voltages, reducing color differences and enhancing frame stability through specific driving methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If one pixel is divided into two sub-pixels with separate thin film transistors for control, then the color difference phenomenon can be improved, but the device complexity increases
Solution Approach 1:
The pixel is divided into two sub-pixels (first sub-pixel and second sub-pixel), each with its own thin film transistor and storage capacitor. This segmentation allows independent voltage control of each sub-pixel, enabling precise compensation for color differences while maintaining manageable complexity through modular design
Solution Approach 2:
Different voltage levels are applied to different sub-pixels within the same pixel through separate bias lines. The first bias line and second bias line provide locally differentiated voltage control, allowing each sub-pixel to be optimized for its specific color output requirements, thereby reducing overall color difference
2Manufacturing precision
If the levels of bias lines are changed after scan line is disabled to create slightly different pixel voltages, then frame quality is enhanced, but the use of energy increases
Solution Approach 1:
The bias line levels are periodically adjusted after each scan line is disabled, creating a rhythmic pattern of voltage differentiation. This periodic action allows the system to maintain frame quality through controlled voltage variations while utilizing the natural refresh cycle of the display, thereby managing energy consumption efficiently
Solution Approach 2:
The storage capacitors are pre-charged during the scan line enabled period, and the bias line adjustments are made in advance during the disabled period. This preliminary charging action ensures that when voltage differentiation is needed, the capacitors are already prepared, reducing the energy required for real-time voltage adjustments
Data Source
AI summary
A multi-domain LCD panel includes data lines, scan lines and pixels. Each pixel includes first and second sub-pixels respectively having first and second storage capacitors. A first data switch is selectively coupled to a first terminal of the first capacitor and one of the data lines. A second data switch is selectively coupled to a first terminal of the second capacitor and one of the data lines. First and second bias lines are respectively coupled to second terminals of the first and second capacitors. When a corresponding scan line is enabled, the first and second data switches turn on such that a signal on the data line is transmitted to the first and second sub-pixels. After the scan line is disabled, levels of the first and second bias lines are changed such that pixel voltages of the first and second sub-pixels differ from each other.