Array Substrate Touch Signal Line Elimination
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Solution Overview
Problem
In dual source in-cell touch panels, the addition of touch signal lines to maintain pixel pitch reduces the aperture ratio, especially in high PPI demands, leading to floating touch signal lines that are not connected to any electrode, affecting display performance.
Innovation Solution
The array substrate design includes touch signal lines connected to touch electrodes, arranged at gaps between sub-pixels, with no floating signal lines, allowing the actual number of touch channels to be determined by the number of electrodes, distributing the area originally used for floating lines to increase the aperture ratio of each sub-pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch signal lines are added in parallel with data signal lines in each pixel unit, then touch signal transmission capability is improved, but aperture ratio deteriorates due to increased line occupancy area
Solution Approach 1:
The patent changes the arrangement dimension of touch signal lines from within-pixel-unit (parallel to data lines) to between-pixel-unit (at gaps of sub-pixel columns). Touch signal lines are arranged in the column direction at gaps between sub-pixel columns, extending along the row direction, thereby utilizing spatial dimension differently to avoid aperture ratio reduction.
Solution Approach 2:
The touch signal lines serve dual purposes: they provide touch signal transmission capability while simultaneously being positioned to not interfere with sub-pixel aperture areas. The lines are strategically placed at column gaps where they can transmit signals without occupying sub-pixel light transmission areas, achieving multi-functionality in spatial utilization.
2Adaptability or versatility
If the number of touch signal lines equals the number of pixel unit columns, then touch signal coverage is improved, but floating touch signal lines appear when touch electrode count is less than pixel column count
Solution Approach 1:
The patent applies local quality by making touch signal line arrangement adaptive to local touch electrode distribution. Touch signal lines are selectively arranged at column gaps where corresponding touch electrodes exist, rather than uniformly across all columns. This ensures each touch signal line connects to a valid touch electrode, eliminating floating lines while maintaining coverage where needed.
Solution Approach 2:
The patent changes the parameter of touch signal line quantity from fixed (equal to pixel column count) to variable (matching touch electrode count). The number and positions of touch signal lines are dynamically adjusted based on the actual touch electrode configuration, ensuring optimal coverage without creating floating lines.
3Manufacturing precision
If pixel pitch is kept constant while adding touch signal lines, then display resolution is maintained, but sub-pixel aperture area is reduced
Solution Approach 1:
The patent resolves this contradiction by changing the spatial dimension where touch signal lines are placed. Instead of adding lines within the horizontal space of each pixel unit (which would reduce aperture area), lines are positioned in the vertical dimension at gaps between sub-pixel columns, allowing pixel pitch to remain constant while aperture area is preserved.
Data Source
AI summary
Disclosed are an array substrate, a liquid crystal display panel and a display apparatus. The array substrate comprises a plurality of pixel units, with each of which being provided with a plurality of sub-pixels (R, G, B) arranged in a first direction; a plurality of touch control electrodes, a region where each of the touch control electrodes is located overlapping with a region where the plurality of sub-pixels (R, G, B) are located; and a plurality of touch control signal lines arranged in gaps between the sub-pixels (R, G, B), wherein each of the touch control signal lines is connected to each of the touch control electrodes, there is no touch control floating signal line not connected to each of the touch control electrodes, and one column of pixel units is correspondingly provided with one touch control signal line.