Color Filter Substrate Isolation Walls Prevent Light Crosstalk
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Solution Overview
Problem
Current OLED display devices experience light crosstalk between adjacent sub-pixel units due to the distance between the light-emitting substrate and the color filter substrate, affecting the display effect.
Innovation Solution
A color filter substrate is designed with a black matrix and isolation walls made of black polyimide material, featuring grooves between color resists to prevent light crosstalk, comprising rectangular, serrated, or wavy grooves, and formed by coating, baking, exposing, and developing processes, with ultraviolet irradiation to create directional polymer chains for effective light absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the distance between light-emitting substrate and color filter substrate is increased, then ease of assembly is improved, but light crosstalk between adjacent sub-pixel units worsens
Solution Approach 1:
The patent introduces isolation walls that divide the color filter substrate into separate regions for adjacent sub-pixels. These isolation walls physically segment the light paths, preventing crosstalk while maintaining the beneficial larger distance for assembly. The segmentation creates independent optical channels for each sub-pixel.
Solution Approach 2:
The isolation walls act as intermediary structures between the light-emitting substrate and color filter substrate. These walls made of black polyimide material serve as mediators that absorb stray light and prevent it from reaching adjacent sub-pixels, thus eliminating crosstalk while allowing the substrates to be positioned at an optimal distance for assembly.
2Manufacturing precision
If isolation walls are added to prevent light crosstalk, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent controls the parameters of the isolation walls precisely - their width, height, and positioning are optimized to provide effective light isolation. By carefully selecting these parameters, the patent achieves high display quality without excessive structural complexity. The isolation wall dimensions are tuned to block crosstalk while minimizing impact on active display area.
Solution Approach 2:
The isolation walls are made of black polyimide material, which is a composite material combining light-absorbing properties with flexible processing characteristics. This material choice allows the isolation walls to be integrated into the existing manufacturing process through coating and curing, adding the necessary light isolation function without significantly increasing device complexity.
3Object-affected harmful factors
If black polyimide material is used for isolation walls, then light absorption is improved, but manufacturing process complexity increases
Solution Approach 1:
The black polyimide material for isolation walls is applied in advance during the substrate fabrication process, before final assembly. The coating is applied, cured by UV irradiation or heating, and then the substrate is assembled. This preliminary action integrates the light-absorbing function into the manufacturing flow without requiring separate post-assembly steps.
Solution Approach 2:
The patent replaces mechanical or physical isolation methods with chemical/material-based solutions. Instead of using complex mechanical structures or precise mechanical positioning to prevent crosstalk, the patent uses the light-absorbing properties of black polyimide material to achieve isolation through material characteristics rather than mechanical design.
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
The solution effectively prevents light crosstalk and color mixing, enhancing the display effect by ensuring the isolation walls are flush with the color resists, thereby improving the overall display quality.
Implementation Method 1
a constituent material of the isolation walls comprises a black polyimide (PI) material
Implementation Method 2
irradiating the isolation wall material with ultraviolet light
Data Source
AI summary
The present disclosure relates to a color filter substrate, a manufacturing method thereof, and an OLED display device. The color filter substrate comprises a substrate, a black matrix, a plurality of color resists, and a plurality of isolation walls. The present disclosure disposes the plurality of isolation walls on the black matrix and between two adjacent color resists, thereby preventing light crosstalk between the adjacent color resists and preventing color mixing, and therefore improving display effect.