Arc-Shaped Touch Pads for Narrow Border Display Panels
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Solution Overview
Problem
Existing in-cell touch display panels face challenges in achieving narrow borders due to the size of touch pads, which occupy significant space in the border areas, limiting further development and design possibilities.
Innovation Solution
The display panel design incorporates an array substrate and a cover plate with touch electrode layers, first touch pads on the cover plate, and second touch pads on the array substrate, where the second touch pads are positioned in irregularly-shaped areas adjacent to the step area, allowing for electrical connections without occupying the border spaces, enabling a narrow border design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If touch pads are disposed in conventional positions on the array substrate, then electrical connection is achieved, but border width increases
Solution Approach 1:
The patent moves touch pads from the conventional planar arrangement on the array substrate to a stepped structure extending in the thickness direction. Specifically, first touch pads are disposed on a first substrate, second touch pads are disposed on a second substrate at a different height level, creating a three-dimensional stepped configuration that reduces the horizontal space required for touch pad placement, thereby narrowing the display panel borders.
Solution Approach 2:
The patent implements a nested configuration where second touch pads are positioned on the second substrate directly beneath or adjacent to first touch pads on the first substrate, creating a vertical stacking arrangement. This nesting approach allows electrical connections to be established through vertical alignment and connection structures, eliminating the need for extended horizontal routing that would increase border width.
2Length of stationary object
If touch pads are reduced in size, then border width decreases, but electrical connection reliability deteriorates
Solution Approach 1:
The patent changes the spatial parameter of touch pad arrangement from two-dimensional planar distribution to three-dimensional stepped configuration. By utilizing the thickness direction as an additional dimension, the patent maintains adequate touch pad size for reliable electrical connection while reducing the horizontal footprint. The stepped structure allows larger touch pad areas to be vertically stacked rather than horizontally spread, preserving connection reliability while narrowing borders.
Data Source
AI summary
Display panel and display device are provided. The display panel includes an array substrate and a cover plate disposed opposite to the array substrate, touch electrode layers on a side of the cover plate facing the array substrate, and a plurality of first touch pads and a plurality of second touch pads disposed opposite to the plurality of the first touch pads. Each of the array substrate and the cover plate include a display area and a non-display area at least partially surrounding the display area. The non-display area of the array substrate includes a step area provided with bonding pads. The non-display area of the array substrate includes at least one irregularly-shaped area adjacent to the step area. A first touch pad is electrically connected to a second touch pad.