LCD Pixel Electrode Area Compensation for Capacitance Uniformity
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Solution Overview
Problem
Liquid crystal displays (LCDs) with a multi-cell gap structure face degradation in display quality due to differing liquid crystal capacitance values across red, green, and blue pixels, affecting image transmission and quality.
Innovation Solution
The implementation of a liquid crystal display (LCD) design with a first and second pixel area on a substrate, where the pixel electrodes have varying areas and distances from the substrate, and an overlap area with a common electrode, ensuring consistent liquid crystal capacitance across all pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a multi-cell gap structure is used to optimize light transmittance for different colors, then light transmittance is improved, but liquid crystal capacitance varies across pixels causing display quality degradation
Solution Approach 1:
The patent applies local quality by creating different cell gap heights for different color regions (red, green, blue pixels) to optimize light transmittance for each wavelength. The color filter layer has varying thicknesses corresponding to different colors, and the pixel electrodes are positioned at different heights to achieve optimal optical performance for each color while maintaining uniform liquid crystal capacitance through compensating electrode area variations.
2Manufacturing precision
If pixel electrodes have different areas to compensate for color filter thickness variations, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent changes geometric parameters of the pixel electrodes, specifically varying their areas according to the color filter thickness in each region. By adjusting the electrode area parameter in proportion to the color filter thickness, the patent compensates for the varying cell gap heights and maintains uniform liquid crystal capacitance across all pixels, thereby improving manufacturing precision without requiring complex additional structures.
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 design maintains consistent liquid crystal capacitance across all pixels, enhancing display quality and minimizing the impact of varying color filter thicknesses, thereby improving image transmission and overall display performance.
Implementation Method 1
an electric field applied to the liquid crystal layer adjusts the arrangement of liquid crystal molecules in the liquid crystal layer, thereby controlling the transmittance of light
Implementation Method 2
an electric field applied to the liquid crystal layer adjusts the arrangement of liquid crystal molecules in the liquid crystal layer, thereby controlling the transmittance of light
Implementation Method 3
Light that passes through the color filter layer may have different transmittance characteristics due to the color of the light
Data Source
AI summary
A liquid crystal display (LCD) includes a first substrate that has a first pixel area with a first transmitting region and a first non-transmitting region and a second pixel area with a second transmitting region and a second non-transmitting region, a first pixel electrode disposed on the first substrate in the first pixel area, and a second pixel electrode disposed on the first substrate in the second pixel area. An area of the first pixel electrode in the first transmitting region is greater than that of the second pixel electrode in the second transmitting region, and an area of the first pixel electrode in the first non-transmitting region is less than that of the second pixel electrode in the second non-transmitting region.