Display Substrate Bright Spot Repair via Laser-Melted Black Matrix
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Solution Overview
Problem
Existing methods for repairing bright spots in display panels are either complex or unsatisfactory, lacking an effective and simple solution.
Innovation Solution
A display substrate with a black matrix comprising intersecting first and second shading strips, where the thickness of the first shading strips is greater than the second, and a method involving laser irradiation to melt and cover the black matrix material over bright spots, converting them into dark spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing bright spot repairing methods are used, then bright spots can be eliminated, but the process becomes complicated or the repairing effect is unsatisfactory
Solution Approach 1:
The patent changes the physical parameter of the black matrix by creating shading strips with different thicknesses. The first shading strips have a first thickness while the second shading strips have a second thickness greater than the first. This parameter differentiation enables selective melting during laser repair, allowing the thinner first shading strips to be melted and flow to cover bright spots effectively, while the thicker second shading strips remain stable to prevent image sticking.
Solution Approach 2:
The patent applies local quality by making different parts of the black matrix have different thicknesses based on their functional requirements. The first shading strips (with smaller thickness) are positioned where laser irradiation is expected to occur for bright spot repair, enabling them to melt and flow. The second shading strips (with larger thickness) are positioned to maintain structural stability and prevent image sticking. This localized differentiation of thickness solves the contradiction between repair effectiveness and structural stability.
2Reliability
If the black matrix material is melted to cover bright spots, then bright spots are converted to dark spots, but light leakage may occur if shading is insufficient
Solution Approach 1:
The patent utilizes the thickness parameter of the shading strips to control both the melting behavior and the shading effectiveness. The first shading strips with smaller thickness are designed to melt completely and flow over bright spots, providing adequate shading material. The second shading strips with larger thickness ensure sufficient shading coverage and prevent light leakage while maintaining structural integrity.
3Ease of repair
If the black matrix structure is modified to improve repairability, then bright spot repair becomes effective, but image sticking may occur due to structural instability
Solution Approach 1:
The patent implements local quality by assigning different thicknesses to different shading strips based on their specific functional roles. The first shading strips with smaller thickness are optimized for repairability - they melt easily under laser irradiation to cover bright spots. The second shading strips with larger thickness are optimized for structural stability - they maintain the overall structure and prevent image sticking. This localized differentiation resolves the contradiction between ease of repair and structural stability.
Solution Approach 2:
The patent changes the thickness parameter of the black matrix structure to simultaneously achieve repairability and stability. By setting the first shading strips to have a smaller thickness (first thickness) and the second shading strips to have a larger thickness (second thickness greater than the first), the structure becomes selectively responsive to laser irradiation while maintaining overall stability.
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 allows for a simple and effective repair of bright spots by melting and re-solidifying the black matrix material, ensuring adequate shading and reducing the risk of light leakage, while maintaining a stable structure to prevent image sticking.
Implementation Method 1
irradiating, by using a laser, a first shading strip adjacent to a pixel unit which has become a bright spot
Implementation Method 2
a part of a material of the black matrix is melted and covers the pixel unit which has become a bright spot
Data Source
AI summary
A display substrate including a base substrate and an optical functional layer provided on the base substrate. The optical functional layer includes a black matrix providing a plurality of first shading strips and a plurality of second shading strips. The plurality of first shading strips intersect with the plurality of second shading strips so as to divide the display substrate into a plurality of pixel units. A thickness of the first shading strips is different from that of the second shading strips.