Color Filter Array Channels for Light Shielding and Flow
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Solution Overview
Problem
Conventional HVA-mode display products using BCS/BM-less technology experience projections around sides due to overlapping color resists, leading to irregular Polyimide (PI) and liquid crystal flow issues, affecting display performance.
Innovation Solution
A color filter array substrate design with channels formed at locations where color resists overlap, incorporating a common electrode line on the first metal layer in the Y-axis direction and a metal line on the second metal layer in the X-axis direction to prevent light leakage and enhance liquid crystal flow, without the need for a planarization layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If color resists are overlapped to achieve light shielding in BCS/BM-less technology, then light shielding effect is improved, but projections around sides are generated causing irregular PI and liquid crystal flow
Solution Approach 1:
The invention segments the overlapping color resist structure by introducing channels (first channels in Y-axis direction, second channels in X-axis direction) at the overlap locations. These channels divide the continuous overlapping region into separate segments, eliminating the projection effect while maintaining the light shielding function through the coordinated action of multiple color resists around the channels.
Solution Approach 2:
The invention applies local quality by creating channels specifically at the color resist overlap locations rather than uniformly across the entire color filter layer. This localized modification addresses the projection problem only where color resists overlap, while preserving the light shielding effect in other regions through the remaining color resist structure.
2Manufacturing precision
If planarization layer is added to flatten projections from color resist overlapping, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The invention extracts and removes the problematic overlapping portion of color resists by forming channels at these locations. This eliminates the need for an additional planarization layer to remove projections, as the channels themselves create a flat surface that allows uniform PI coating and liquid crystal filling without adding structural complexity.
3Manufacturing precision
If channels are formed at color resist overlap locations, then projections are eliminated improving liquid crystal flow, but light leakage may occur through channels
Solution Approach 1:
The invention merges multiple light shielding mechanisms to compensate for the light leakage risk through channels. Specifically, it combines: (1) the light shielding effect of color resists positioned around the channels, (2) the light shielding effect of metal lines (data lines or extended drain portions) disposed at the channels, and (3) the light shielding effect of common electrode lines. This multi-layered approach ensures comprehensive light blocking while maintaining the flow benefits of channels.
Solution Approach 2:
The invention employs composite light shielding structures at the channel locations, combining organic color resist materials with inorganic metal line materials. This composite approach provides superior light shielding performance compared to using either material alone, effectively preventing light leakage through the channels while maintaining the structural benefits for liquid crystal flow.
Data Source
AI summary
A color filter array substrate is disclosed. The color filter array substrate includes a glass substrate, a first metal layer, an insulating layer, an active layer, an ohmic contact layer, a second metal layer, a first passivation layer, a color filter layer, a second passivation layer, and a pixel electrode layer. In the color filter layer, channels are formed at locations where color resists overlap, a common electrode line is disposed on the first metal layer corresponding to the channels and a metal line is disposed on the second metal layer corresponding to the channels. The present invention can effectively shield light leakage, and can also increase liquidity of the PI and LCD.