Black Matrix Peripheral Area Optimization for LCD Stain Reduction
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Solution Overview
Problem
Liquid crystal displays face issues with stains during the dispensing process due to the formation of a black matrix layer and color spacer, which are difficult to manage simultaneously without increasing the step difference between shielding and pixel areas.
Innovation Solution
A display substrate design where the black matrix layer, including a column spacer and a peripheral portion, is optimized to have an area of the peripheral portion relative to the unit pixel area of 11% or less, achieved by adjusting the exposure level of the material layer during the formation process, thereby reducing the non-transmissive region and minimizing contaminant emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix layer is formed to create a shielding region, then light blocking function is improved, but dispensing stains are generated during liquid crystal dispensing process
Solution Approach 1:
The patent applies parameter changes by adjusting the exposure level of the material layer during the black matrix layer formation process. By controlling the exposure level to form a peripheral portion with specific area (11% or less of unit pixel area), the patent reduces contaminant emission during liquid crystal dispensing while maintaining the light blocking function of the black matrix layer.
2Area of stationary object
If a black matrix layer with large peripheral portion is formed, then shielding region coverage is improved, but step difference between shielding and pixel areas increases
Solution Approach 1:
The patent controls the area of the peripheral portion of the black matrix layer to be 11% or less of the unit pixel area. This parameter control maintains adequate shielding region coverage while minimizing the step difference between the shielding and pixel areas, ensuring proper liquid crystal injection.
3Manufacturing precision
If exposure level of material layer is increased to form black matrix layer, then black matrix layer formation is improved, but contaminant emission during dispensing process increases
Solution Approach 1:
The patent optimizes the exposure level of the material layer to form the black matrix layer with a controlled peripheral portion area (11% or less of unit pixel area). This optimized exposure level ensures proper black matrix layer formation while minimizing contaminant emission during the liquid crystal dispensing process.
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 approach effectively reduces dispensing stains while maintaining a minimal step difference between the shielding and pixel areas, ensuring efficient liquid crystal injection and display performance.
Implementation Method 1
adjusting an exposure level of a material layer for forming a black matrix
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes a substrate having a shielding area and a pixel area, and a black matrix layer disposed in the shielding area of the substrate and having a column spacer and a peripheral portion other than the column spacer, wherein an area of the peripheral portion of the black matrix layer relative to unit pixel area is approximately 11% or less.