Touch Array Substrate Layout for Higher Pixel Opening Ratio
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Solution Overview
Problem
Existing touch screen technologies face challenges with complex routing of touch signal lines, leading to difficulties in achieving high pixel opening ratios and efficient performance, especially in large-size touch display apparatuses.
Innovation Solution
The proposed array substrate design includes an underlay substrate with first and second signal lines, touch signal lines, and transparent conductive layers. The touch signal lines are connected to touch sensing blocks, and the transparent conductive layers are strategically positioned to overlap with the touch signal lines, improving wiring convenience and pixel opening ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch signal lines are routed through sub-pixel regions to connect touch sensing blocks, then touch sensing functionality is achieved, but the pixel opening ratio is reduced due to wiring occupying display area
Solution Approach 1:
The patent transitions the touch signal line routing from a two-dimensional plane within sub-pixel regions to a three-dimensional structure by extending lines outside the sub-pixel region boundary. This dimensional change allows signal lines to bypass the constrained sub-pixel area while maintaining electrical connectivity, thereby preserving pixel opening ratio without compromising touch sensing functionality.
2Ease of manufacture
If touch signal lines are extended outside sub-pixel regions, then wiring convenience is improved and pixel opening ratio increases, but the routing path becomes more complex
Solution Approach 1:
The patent segments the touch signal line routing into distinct portions: segments within sub-pixel regions for local connectivity and segments outside sub-pixel regions for long-distance routing. This segmentation allows each portion to be optimized independently, simplifying the overall routing design by clearly defining where lines should extend outside sub-pixel boundaries rather than attempting complex in-region routing.
3Reliability
If multiple touch signal lines are routed through limited sub-pixel region space, then touch sensing blocks are connected, but wiring density increases making routing difficult
Solution Approach 1:
The patent extracts the routing problem by removing touch signal lines from the constrained sub-pixel region environment and extending them into the broader panel area. This extraction relieves the wiring density issue within sub-pixel regions, allowing multiple signal lines to be routed outside the confined space without increasing local wiring complexity, thus simplifying the overall routing architecture.
Data Source
AI summary
An array substrate, including: a base substrate, and a plurality of first signal lines, a plurality of second signal lines, a plurality of touch-control signal lines, a first transparent conductive layer and a second transparent conductive layer, which are arranged on the base substrate. The first transparent conductive layer and the second transparent conductive layer are located on the side of the touch-control signal lines that is away from the base substrate. The touch-control signal lines are connected to at least one touch-control sensing block, which includes a plurality of touch-control electrodes connected to each other and spaced apart from each other; and the first transparent conductive layer or the second transparent conductive layer includes the plurality of touch-control electrodes. The plurality of first signal lines and the plurality of second signal lines intersect to form a plurality of sub-pixel regions, which include opening regions.