COA Display Light-Shielding Structure for Bonding Misalignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In liquid crystal display devices with a color filter on the array substrate, misalignment during bonding of substrates can lead to degraded display quality due to light leakage from dummy pixels, especially when the second substrate has a surrounding light-shielding layer.
Innovation Solution
The first light-shielding layer is designed with wider widths at the substrate overlap boundaries and dummy pixels are set to a common potential to prevent light leakage, even with misalignment, using a COA structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the color filter is provided on the array substrate, then bonding between substrates becomes easier, but display quality degrades due to misalignment and light leakage from dummy pixels
Solution Approach 1:
The light-shielding layer is segmented into multiple regions with different widths: a first region with a first width at the boundary between display and non-display areas, and a second region with a second width in the non-display area. This segmentation allows targeted light shielding where needed while maintaining manufacturing ease.
Solution Approach 2:
The light-shielding layer exhibits local quality variations through different width regions. The first region has a greater width to prevent light leakage at the critical boundary area, while the second region has a smaller width in the non-display area. This local differentiation addresses the light leakage problem specifically at the boundary without unnecessarily increasing shielding elsewhere.
2Device complexity
If the light-shielding layer has uniform width, then manufacturing is simpler, but light leakage occurs at substrate boundaries with misalignment
Solution Approach 1:
The light-shielding layer is designed with non-uniform width to provide enhanced light shielding at the boundary region between display and non-display areas. The first region has a greater width than the second region, creating local quality variation that specifically addresses light leakage at the substrate boundary while maintaining simpler structure in other areas.
Solution Approach 2:
The light-shielding layer is divided into distinct segments: a first region at the boundary with greater width for light shielding, and a second region in the non-display area with smaller width. This segmentation allows the structure to address light leakage problems locally without increasing overall device complexity significantly.
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate, and a liquid crystal layer. The first substrate includes first pixels overlapping with a display area and second pixels overlapping with a surrounding area, color filters corresponding to each of the first pixels, and a first light-shielding layer including an aperture overlapping with each of the first and second pixels. The second substrate includes a second light-shielding layer surrounding the display area. The width of the first light-shielding layer arranged at a position overlapping with an end portion of the display area is greater than a width between apertures overlapping with each of first pixels adjacent to each other.