Capacitor Electrode Shape Adjustment for LCD Feed-Through Voltage
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Solution Overview
Problem
In liquid crystal displays, the voltage fluctuations caused by feed-through voltages lead to flickering and reduced display quality, especially in high-resolution, small-size LCDs, where the enlargement of capacitor electrodes to maintain uniform feed-through voltages compromises aperture ratios and brightness.
Innovation Solution
The design includes a pixel array substrate with differently shaped or sized capacitor electrodes, particularly in the sub-pixel region with a spacer, to adjust feed-through voltages while maintaining a high aperture ratio by adjusting the coupled areas of the capacitors between the gates and drains, ensuring uniform feed-through voltages across sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitor electrodes are enlarged to maintain uniform feed-through voltages across sub-pixels, then the feed-through voltage uniformity is improved, but the aperture ratio is reduced and display brightness is compromised
Solution Approach 1:
The patent applies local quality by making the capacitor electrode configuration different in the third sub-pixel region (with spacer) compared to the first and second sub-pixel regions (without spacer). Specifically, the third capacitor electrode has a different shape or maximum width to accommodate the spacer while maintaining uniform feed-through voltages across all sub-pixels, thereby avoiding the need to enlarge all capacitor electrodes uniformly and preserving overall aperture ratio
Solution Approach 2:
The patent employs asymmetry by creating non-uniform capacitor electrode configurations across different sub-pixel regions. The third capacitor electrode (in the region with spacer) has a different shape or maximum width compared to the first and second capacitor electrodes, allowing for localized optimization that maintains feed-through voltage uniformity without requiring symmetric enlargement of all electrodes
2Reliability
If the capacitor electrode area is increased to ensure sufficient spacer support area, then the spacer function is improved, but the aperture ratio of the sub-pixel is reduced
Solution Approach 1:
The patent applies local quality by making the capacitor electrode configuration different in the third sub-pixel region (with spacer) compared to the first and second sub-pixel regions (without spacer). Specifically, the third capacitor electrode has a different shape or maximum width to accommodate the spacer while maintaining uniform feed-through voltages across all sub-pixels, thereby avoiding the need to enlarge all capacitor electrodes uniformly and preserving overall aperture ratio
Solution Approach 2:
The patent utilizes dimensional change by adjusting the shape and maximum width of the third capacitor electrode in different orientations. By optimizing the electrode geometry in multiple dimensions (length, width, shape) rather than simply increasing area uniformly, the design provides sufficient spacer support while minimizing the impact on aperture ratio
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively prevents flickering, enhances display brightness, and maintains a high aperture ratio by unifying feed-through voltages without sacrificing overall display quality, even in small-size, high-resolution LCDs.
Implementation Method 1
the voltage level of the pixel electrode in each of the sub-pixels SP10A, SP10B, SP10C . . . is held through a liquid crystal capacitor CLC and a pixel storage capacitor CST
Implementation Method 2
rotation angles of liquid crystal molecules vary with changes in the intensity of the electric field applied to the liquid crystal molecules so that various gray levels may be displayed
Data Source
AI summary
In a pixel array substrate, scan lines intersect data lines to define first to third sub-pixel regions. First to third conductive parts are respectively disposed in the first to third sub-pixel regions. First to third capacitor electrodes are respectively disposed over the first to third conductive parts to form pixel storage capacitors. A spacer is disposed over the third capacitor electrode. At least one of a shape or a size of the third capacitor electrode is different from that of the first or second capacitor electrode.