COA Liquid Crystal Display Panel Color Resist Layer Relocation
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Solution Overview
Problem
In COA type liquid crystal display panels, the color resist layer extending beyond the frame electrode increases the distance between the frame and common electrodes, reducing the storage capacitor size and compromising display stability and leak current requirements.
Innovation Solution
The color resist layer borders are relocated to the inner sides of the frame and common electrodes, eliminating the layer between them and reducing the vertical distance, thereby increasing the storage capacitor size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the color resist layer extends to the outer sides of the frame electrode, then the color filter manufacturing is simplified, but the distance between the frame electrode and common electrode line increases, reducing the storage capacitor size
Solution Approach 1:
The color resist layer is designed with different extensions in different regions: it extends to the outer sides of the frame electrode in the pixel area for simplified manufacturing, but is restrained from extending between the frame electrode and common electrode line to maintain capacitor performance. This local differentiation resolves the contradiction between manufacturing ease and display stability.
2Area of stationary object
If the color resist layer is positioned between the frame electrode and common electrode line, then the color filter coverage is improved, but the storage capacitor capacitance is reduced due to increased plate distance
Solution Approach 1:
The color resist layer is segmented into two distinct regions: one region extends to the outer sides of the frame electrode for color filter coverage, while the other region is restricted from extending between the frame electrode and common electrode line to preserve capacitor capacitance. This segmentation allows both functions to coexist without interference.
3Length of stationary object
If the distance between frame electrode and common electrode line is increased, then the color resist layer can extend further, but the storage capacitor size decreases according to capacitance formula C=εS/d
Solution Approach 1:
The color resist layer is designed with different extensions in different regions: it extends to the outer sides of the frame electrode in the pixel area for simplified manufacturing, but is restrained from extending between the frame electrode and common electrode line to maintain capacitor performance. This local differentiation resolves the contradiction between manufacturing ease and display stability.
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 configuration enhances the display quality by increasing the storage capacitor capacitance, improving stability and meeting leak current requirements.
Implementation Method 1
The working principle is that the light of backlight module is reflected to generate images by applying driving voltages to the two glass substrate for controlling the rotations of the liquid crystal molecules
Implementation Method 2
a storage capacitor Cst is formed between the frame electrode 175 and the common electrode line 120 located below correspondingly thereto
Data Source
AI summary
The present invention provides a COA type liquid crystal display panel. In each pixel unit of the lower substrate, borders of the color resist layer in respective directions are all located at inner sides of the frame electrode and the common electrode line, then no color resist layer is arranged between the frame electrode and the common electrode line to reduce a vertical distance between the frame electrode and the common electrode line and provide a larger storage capacitor. Accordingly, the display quality of the COA type liquid crystal display panel is promoted.