Pixel Electrode Slit Reduces Coupling Capacitance in VA LCD
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Solution Overview
Problem
The existing Vertical Alignment (VA) LCD panels face a color washout issue due to extra coupling capacitance between pixel electrodes, which weakens charge sharing and makes it difficult to maintain a sufficient voltage difference between them, thereby reducing the efficiency and open ratio of the panel.
Innovation Solution
The pixel array substrate design includes a new layout with a first slit in the first pixel electrode that exposes part of the second connecting line, minimizing coupling capacitance and allowing for easier voltage difference increase between pixel electrodes, thus enhancing charge sharing and panel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pixel area is divided into two parts with overlapping connecting lines to enable charge sharing, then color washout issue is solved, but coupling capacitance increases and charge sharing efficiency decreases
Solution Approach 1:
The patent extracts the harmful overlapping portion of the second connecting line from the pixel structure by introducing a first slit in the first pixel electrode. This removes the source of coupling capacitance while preserving the charge sharing function through the charge sharing capacitor, thereby solving color washout without compromising charge sharing efficiency.
Solution Approach 2:
The patent applies local quality by creating a first slit specifically in the first pixel electrode at the location where the second connecting line passes through. This localized modification reduces coupling capacitance only in the critical overlapping region while maintaining the overall pixel structure and charge sharing capability elsewhere.
2Reliability
If coupling capacitance is reduced by modifying pixel electrode structure, then charge sharing efficiency improves, but pixel electrode area decreases
Solution Approach 1:
The patent applies partial action by introducing a slit that removes only the specific portion of the pixel electrode where overlapping occurs, rather than reducing the entire electrode area. The slit is positioned strategically to eliminate coupling capacitance while preserving the majority of the pixel electrode area for effective charge storage and display function.
3Illumination intensity
If voltage difference between pixel electrodes is increased to solve color washout, then display quality improves, but energy consumption increases
Solution Approach 1:
The patent converts the harmful coupling capacitance effect into a beneficial structure by using the slit to expose the second connecting line. This structural modification enables better voltage control and charge sharing through the charge sharing capacitor, achieving improved display quality through more efficient charge distribution rather than simply increasing voltage difference, thereby reducing energy consumption.
Data Source
AI summary
A pixel array substrate with new pixel design and a liquid crystal display panel with the pixel array substrate are provided. The pixel array substrate includes a plurality of data lines, a plurality of scan lines and a plurality of pixels. Each of the pixels comprises a first electrode, a first connecting line, a second electrode and a second connecting line. The first electrode is electrically connected with corresponding data line and scan line through the first connecting line, and having a slit. The second pixel is electrically connected with corresponding data line and scan line through the second connecting line. At least a part of the second connecting line is exposed by the slit of the first electrode.