COA Substrate Protrusions Enhance Light Penetration
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Solution Overview
Problem
Conventional liquid crystal display devices suffer from low light penetration rates and poor display quality due to the weaker electric field intensity in interval regions of the COA substrate, leading to crosstalk and decreased image quality.
Innovation Solution
A COA substrate with a color resist layer featuring protrusions and recesses is introduced, where the pixel electrodes are integrated and positioned on these surface features, increasing electric field intensity and light penetration by using a half-tone mask to pattern the color resist layer, thereby enhancing multi-domain display and preventing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pixel electrode region and interval region are necessarily existed in the COA substrate to prevent crosstalk, then the crosstalk phenomenon is prevented, but the electric field intensity in the interval region becomes weaker, resulting in decreased light penetration rate and display quality
Solution Approach 1:
The invention transitions from a two-dimensional planar color resist layer to a three-dimensional structure with protrusions and recesses. The pixel electrodes are positioned at different heights (different dimensions) - some at the protrusion tops and some at the recess bottoms - creating vertical layering that enables multi-domain display while maintaining strong electric fields in all regions, thus resolving the contradiction between crosstalk prevention and light penetration rate
Solution Approach 2:
The color resist layer surface is segmented into multiple protrusions and recesses, dividing the display region into multiple domains. Each domain has its own pixel electrode positioned at different heights, allowing independent electric field control in each domain while preventing crosstalk between adjacent domains, and ensuring sufficient electric field intensity in all regions for high light penetration rate
2Reliability
If the pixel electrode region and interval region are necessarily existed in the COA substrate, then the crosstalk phenomenon is prevented, but the display quality is affected due to weaker electric field intensity in the interval region
Solution Approach 1:
By adding the vertical dimension with protrusions and recesses, the invention creates multiple display domains within the same planar area. This three-dimensional structure allows precise control of liquid crystal molecules in each domain through appropriately positioned pixel electrodes, achieving high display quality and fine image representation while preventing crosstalk between domains
Solution Approach 2:
Different regions of the color resist layer are given different local qualities through the protrusion-recess structure. Pixel electrodes at protrusion tops and recess bottoms create different electric field distributions optimized for their respective locations, enabling high-precision display control in each local domain while maintaining overall image quality and preventing crosstalk
Data Source
AI summary
A COA substrate is provided including a substrate base, a first metal layer, a first insulating layer, a semiconductor layer, a second metal layer, a color resist layer, and a pixel electrode layer. The surface of the color resist layer is provided with a protrusion and a recess, and the pixel electrode is disposed on the protrusion and the recess. A plurality of protrusions and a plurality of recesses are provided, thereby increasing the display quality of a liquid crystal display device.