Display Substrate Convex Structure Alignment Layer Protection
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Solution Overview
Problem
Existing methods for disposing post spacers in augmented reality (AR) and virtual reality (VR) display substrates, such as PS on CF and PS on Array, result in 'PS Mura' issues like ripples and light leakage due to misalignment and insufficient strength, leading to display defects like irrecoverable color spots when subjected to external forces.
Innovation Solution
A display substrate design featuring a light-transmissive region and a light-shielding region with a convex structure on the alignment layer, which does not completely cover the alignment layer, providing a height difference to prevent scratching and maintaining alignment layer integrity under external forces, and includes a resin convex structure with specific dimensions and arrangements to support the liquid crystal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a post spacer is disposed on a color filter substrate or array substrate, then the liquid crystal layer thickness can be maintained, but alignment layer scratching and display defects occur under external forces
Solution Approach 1:
The patent introduces a height dimension difference between the convex structure top surface and the alignment layer surface. The convex structure rises above the alignment layer by 0.01-0.5 μm, creating a vertical separation that prevents the post spacer from contacting and scratching the alignment layer while still maintaining liquid crystal layer thickness through mechanical support.
2Reliability
If the convex structure completely covers the alignment layer, then the alignment layer is protected, but the orientation of liquid crystal molecules cannot be ensured
Solution Approach 1:
The convex structure is designed with selective coverage - it protects the alignment layer in the light-shielding region while leaving the light-transmissive region exposed. This local differentiation allows the alignment layer to maintain its orientation function in the light-transmissive area while receiving mechanical protection in the light-shielding area where the convex structure is located.
3Reliability
If the distance difference between convex structure and alignment layer is too large, then scratching is prevented, but liquid crystal layer thickness control becomes difficult
Solution Approach 1:
The patent specifies precise parameter ranges: the height difference between the convex structure top surface and alignment layer surface is controlled at 0.01-0.5 μm, and the convex structure height is 0.5-2.0 μm. These controlled parameter changes optimize the balance between protection and thickness control, preventing scratching while maintaining manufacturing precision for liquid crystal layer thickness.
Data Source
AI summary
Embodiments of the present disclosure provide a display substrate and a display panel. The display substrate has a light-transmissive region and a light-shielding region, and the light-shielding region includes a main support region and a secondary support region. The display substrate includes a substrate, an alignment layer on the substrate, and a convex structure on the alignment layer. The convex structure is on a side of the alignment layer distal to the substrate and at least in the main support region, and a distance from a surface of the convex structure distal to the substrate to the substrate is greater than a distance from a surface of the alignment layer distal to the substrate to the substrate.