MVALCD Sub-pixel Circuit Topology for Aperture Ratio
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Solution Overview
Problem
In multi-domain vertically aligned liquid crystal display (MVALCD) technology, the aperture ratio of pixels is limited by the circuit area occupied by voltage-adjusting capacitors, which affects display quality and viewing angle.
Innovation Solution
The display panel design includes a configuration where first and second sub-pixels share three scan lines, allowing pixel voltages to be transmitted through corresponding data lines, thereby omitting the voltage-adjusting capacitor and increasing the aperture ratio by reducing the number of wires and circuit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage-adjusting capacitors are used to adjust sub-pixel voltages, then the display quality and viewing angle are improved, but the aperture ratio of pixels deteriorates due to increased circuit area
Solution Approach 1:
The patent merges the voltage adjustment function into the liquid crystal capacitor by utilizing the pixel electrode as one plate of the capacitor and the common electrode as the other plate. This integration eliminates the need for separate voltage-adjusting capacitors, thereby reducing circuit area while maintaining the voltage adjustment capability needed for display quality and viewing angle performance.
Solution Approach 2:
The liquid crystal capacitor is designed to serve dual functions: storing electrical charge for maintaining pixel voltage and enabling voltage adjustment for different sub-pixels. By making the capacitor multi-functional, the patent eliminates the need for additional dedicated voltage-adjusting capacitors, thus improving aperture ratio while preserving display quality.
2Reliability
If separate capacitors are used for each sub-pixel voltage adjustment, then the viewing angle and color accuracy are improved, but the circuit area and device complexity increase
Solution Approach 1:
The patent combines multiple functions into a single liquid crystal capacitor structure. The same capacitor serves for voltage storage and voltage adjustment for multiple sub-pixels by controlling which electrode connections are active during different time periods, thereby reducing device complexity while maintaining wide viewing angle performance.
Solution Approach 2:
The patent employs periodic scanning and selective connection of electrodes during different time periods to achieve voltage adjustment for multiple sub-pixels. By using time-division multiplexing, the system can adjust voltages for different sub-pixels sequentially without requiring separate capacitors for each, thus reducing circuit area while maintaining display quality.
Data Source
AI summary
A display panel and a driving method thereof are provided. The display panel includes a plurality of scan lines, a plurality of first data lines, a plurality of second data lines and a plurality of pixels. The scan lines receive a plurality of scan signals. The pixels are arranged in an array and respectively have a first sub-pixel and a second sub-pixel. In each column, the first sub-pixel of i-th odd pixel electronically connects (2i−1)-th scan line and a corresponding first data line, the second sub-pixel of i-th odd pixel electronically connects (2i−1)-th and (2i)-th scan line and the corresponding first data line, the first sub-pixel of i-th even pixel electronically connects (2i)-th scan line and a corresponding second data line, and the second sub-pixel of i-th even pixel electronically connects (2i)-th and (2i+1)-th scan line and the corresponding second data line, wherein the i is a positive integer.