Arc-Shaped Touch Sensing Elements for Rounded OLED Corners
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Solution Overview
Problem
Current touch patterns on display devices with abnormal shapes, such as rounded corners, suffer from weakened touch signals and degraded performance due to the need to cut off significant parts of the touch pattern at the edge, resulting in less than satisfactory integrity and performance.
Innovation Solution
Incorporating touch sensing elements with an arc outline in the rounded corner display area of an organic electroluminescent display panel, where the arc matches or closely follows the curvature of the corner, to minimize the extent of cutting required and enhance signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a larger radian R corner is used for the rounded corner display area, then the appearance is improved and the corner is more rounded, but a larger part of the touch pattern needs to be cut off, resulting in weaker touch signal and degraded touch performance
Solution Approach 1:
The touch sensing element outline is designed with an arc that matches the curvature of the rounded corner display area, creating a curved rather than linear transition. This allows the touch pattern to follow the rounded corner geometry while maintaining adequate signal strength by reducing the amount of pattern that must be cut off.
Solution Approach 2:
The touch sensing element outline is specifically adapted in the rounded corner region with an arc shape, while the rest of the touch pattern maintains its standard geometry. This localized modification allows the touch pattern to accommodate the rounded corner without compromising overall touch sensitivity or requiring extensive cutting.
2Shape
If the touch pattern is cut off to match the rounded corner, then the touch pattern fits the display area, but the touch pattern integrity is reduced to less than 75%, resulting in weakened edge touch signal
Solution Approach 1:
By replacing the linear cut-off with an arc-shaped outline that follows the rounded corner curvature, the touch pattern maintains continuity and integrity. The curved transition preserves more of the touch pattern area compared to a straight cut, keeping integrity above the 75% threshold while still matching the rounded corner display area.
3Device complexity
If a standard rectangular touch pattern is used, then the touch pattern is simple to implement, but it does not match the abnormal shape of the rounded corner display area, resulting in poor edge touch performance
Solution Approach 1:
The touch sensing element outline is modified only in the rounded corner region with an arc shape, while the majority of the touch pattern retains its standard rectangular geometry. This localized adaptation maintains relative design simplicity while significantly improving edge touch performance in the rounded corner areas.
Data Source
AI summary
The disclosure discloses an organic electroluminescent display panel and a display device. The display panel includes at least one touch sensing element located in a rounded corner display area of the display panel. An outline of the at least one touch sensing element includes an arc. The arc lies against an outline of the rounded corner of the rounded corner display area. In this way, difference between the outline of the touch pattern of the display panel and the outline of the abnormally shaped display panel can be minimized to reduce the size of parts of touch sensing element(s) going beyond the rounded corner display area that need to be cut off and integrity of the pattern of the touch sensing element(s) can be improved, thus improving quality of response signals and the touch performance at the abnormally shaped edge.