Concave Surface Compensation Pattern for LCD Aperture Grooves
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) face challenges in displaying moving images due to slow liquid crystal response characteristics and poor viewing angles, primarily because the concave grooves formed by apertures in the common electrode create resistance that hinders even filling of liquid crystals between display substrates.
Innovation Solution
The introduction of a concave surface compensation pattern and an overcoating layer that protrudes into the aperture of the common electrode, reducing the depth of the concave groove and facilitating even liquid crystal distribution, while also potentially blocking light to enhance black display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If apertures are formed in the common electrode to improve liquid crystal distribution, then viewing angles and response speed are improved, but concave grooves are created that increase resistance to liquid crystal filling
Solution Approach 1:
The concave surface compensation pattern is formed in advance on the insulating substrate at the aperture location, creating a protrusion that extends into the aperture. This preliminary structural preparation reduces the depth of the concave groove before liquid crystal filling occurs, thereby reducing resistance to liquid crystal filling while maintaining the aperture's function for improved response speed and viewing angles.
2Illumination intensity
If the common electrode is made transparent to allow light transmission, then display brightness is improved, but black color representation deteriorates due to light leakage through apertures
Solution Approach 1:
The concave surface compensation pattern is specifically located at the aperture region, creating a localized protrusion that blocks light transmission through the aperture while the rest of the transparent common electrode maintains its light transmission properties. This local modification prevents light leakage at the aperture without affecting overall display brightness.
Data Source
AI summary
A display apparatus has a first display substrate including a pixel electrode, and a second display substrate facing the first display substrate and including a pixel region. The second display substrate includes an insulating substrate, a concave surface compensation pattern that is in the pixel region and that is on the insulating substrate, an overcoating layer covering the concave surface compensation pattern, and a common electrode that is on the overcoating layer and that has an aperture therein at a location corresponding to the concave surface compensation pattern.