Touch Display Bezel Cover Layer for Reflection Reduction
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Solution Overview
Problem
OLED touch display screens with metal mesh electrodes suffer from high reflectivity issues, leading to suboptimal anti-reflection effects, especially at oblique angles, causing Mura phenomena at the edges of protrusion sub-areas, which affect the display quality.
Innovation Solution
A touch display screen design featuring a bezel cover layer that covers the orthographic projections of preset lead portions in the bezel area, reducing reflection areas and alleviating Mura issues without increasing the bezel cover layer's area, and optionally reducing the wire width of uncovered lead portions to minimize reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the bezel cover layer area is increased to cover more lead portions, then the anti-reflection effect is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by selectively covering only the lead portions adjacent to the protrusion sub-area with the bezel cover layer, rather than uniformly covering the entire bezel area. This localized approach addresses the reflection problem specifically at the problematic edge regions while avoiding unnecessary increases in overall bezel cover layer area and manufacturing complexity.
Solution Approach 2:
The patent implements partial action by covering only the specific lead portions that cause Mura phenomena (those adjacent to the protrusion sub-area) rather than covering all lead portions or the entire bezel area. This partial coverage is sufficient to mitigate the harmful reflection effects while minimizing the bezel cover layer area.
2Object-affected harmful factors
If the wire width of lead portions is reduced to minimize reflection, then the anti-reflection effect is improved, but the electrical conductivity and signal transmission quality deteriorate
Solution Approach 1:
The patent applies local quality by reducing the wire width only for the lead portions adjacent to the protrusion sub-area (preset lead portions), while maintaining the original wire width for other lead portions. This localized wire width reduction addresses reflection issues at specific edge regions without compromising the overall electrical conductivity and signal transmission quality of the touch electrode structure.
Solution Approach 2:
The patent implements partial action by modifying the wire width of only those lead portions that are visible and cause reflection problems (preset lead portions adjacent to protrusion sub-area), rather than reducing the wire width of all lead portions. This partial modification achieves the anti-reflection effect while preserving adequate electrical conductivity where full wire width is maintained.
Data Source
AI summary
The touch display screen includes a display panel, a touch electrode structure on a light-emitting side of the display panel and a bezel cover layer. The touch display screen includes a display area and a bezel area, and the bezel area has a protrusion sub-area toward the display area. The bezel cover layer is located in the bezel area. The touch electrode structure includes a plurality of touch electrodes and a plurality of leads. The plurality of touch electrodes are located in the display area, and the plurality of leads are arranged in the bezel area along an edge of the display area. The portion of each of the plurality of leads adjacent to the protrusion sub-area is a preset lead portion. An orthographic projection of the bezel cover layer on the display panel covers an orthographic projection of at least one the preset lead portion on the display panel.