Dummy Color Layer Density Gradient for LCD Light Leakage
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Solution Overview
Problem
In liquid crystal display (LCD) devices with a black column spacer (BCS) structure, the density of the light-blocking layer rapidly changes at the border between the display area and non-display area, leading to light leakage due to overdevelopment of the light-blocking layer at the edge of the display area during the formation process.
Innovation Solution
A display device structure is implemented with a first light-blocking layer in the non-display area and a dummy color layer adjacent to the boundary between the display and non-display areas, where the density of the light-blocking layer increases and the dummy color layer decreases from the boundary outward, with an opening portion penetrating the light-blocking layer to expose the dummy color layer, thereby preventing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-blocking layer is disposed in the non-display area with a black column spacer structure, then light blocking performance is improved, but the density rapidly changes at the border between display and non-display areas causing overdevelopment and light leakage
Solution Approach 1:
The patent applies local quality by creating a dummy color layer with spatially varying density - higher density near the display area boundary and lower density toward the non-display area. This gradient density distribution prevents rapid density changes at the boundary, thereby preventing overdevelopment and light leakage while maintaining effective light blocking where needed.
Solution Approach 2:
The patent changes the density parameter of the dummy color layer across different spatial locations. By adjusting the density from high near the boundary to low in the non-display area, the patent resolves the contradiction between needing sufficient light blocking (requiring high density) and maintaining uniform development (requiring gradual density transitions).
Data Source
AI summary
A display device includes a first substrate and a second substrate, which face each other, and each of which includes a display area and a non-display area disposed outside the display area, a first light-blocking layer disposed in the non-display area, and a dummy color layer, in which a boundary dividing the display area and the non-display area is defined, and which is disposed in the non-display area of the first substrate to be adjacent to the boundary, where the dummy color layer includes a section in which a distribution density of the dummy color layer is decreased from the boundary to the outside of the non-display area.