Touch Substrate Via-Hole Distribution for Display Uniformity
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Solution Overview
Problem
Existing touch panels, particularly self-capacitive and mutual-capacitive types, suffer from uneven display due to irregular distribution of via-holes, leading to differences in pixel aperture ratios, light diffraction efficiencies, and electric fields, resulting in adverse display effects.
Innovation Solution
A touch substrate with a uniform distribution of via-holes, where each driving signal transmission line is connected to the corresponding touch electrode through a via-hole, and projections of via-holes at other regions are perpendicular to the substrate, ensuring even pixel arrangements and reduced differences between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If via-holes are distributed irregularly to connect driving signal transmission lines to touch electrodes, then the touch electrode can be connected to the driving signal transmission line, but pixel aperture ratios, light diffraction efficiencies, and electric fields become different, resulting in uneven display
Solution Approach 1:
The patent applies local quality by making the via-hole distribution pattern different at different locations. Specifically, via-holes are arranged in a first pattern at a first region and in a second pattern at a second region, where the patterns differ to compensate for the irregular distribution. This allows each pixel to have appropriate via-hole configuration for its specific location while maintaining overall display uniformity.
Solution Approach 2:
The patent changes the spatial distribution parameters of via-holes to resolve the contradiction. By adjusting the arrangement pattern of via-holes based on their spatial location (first pattern vs. second pattern), the patent optimizes both the connection reliability of driving signal transmission lines and the uniformity of display across different pixels.
2Manufacturing precision
If via-holes are arranged at identical amount and manner at each touch electrode region, then display uniformity is improved, but the driving signal transmission line may be connected to wrong touch electrodes
Solution Approach 1:
The patent uses local quality by implementing location-specific via-hole patterns. The first region has a first via-hole arrangement pattern while the second region has a second via-hole arrangement pattern. This differentiation ensures that driving signal transmission lines connect to the correct touch electrodes based on their spatial location, preventing wrong connections while maintaining display uniformity.
3Reliability
If irregular via-hole distribution is used to prevent wrong connections, then connection accuracy is improved, but pixel aperture ratios and light diffraction efficiencies become different
Solution Approach 1:
The patent applies local quality by implementing different via-hole patterns at different spatial regions. The first region (where driving signal transmission lines are located) uses a first via-hole pattern that ensures accurate connections, while the second region uses a second via-hole pattern that compensates for light transmission requirements. This differentiated approach maintains both connection accuracy and light transmission uniformity.
Solution Approach 2:
The patent changes the spatial distribution parameters of via-holes based on region. By adjusting the arrangement, density, and positioning of via-holes in different regions, the patent optimizes both connection accuracy for driving signal transmission lines and light transmission characteristics for display uniformity.
Data Source
AI summary
A self-capacitive touch panel includes a plurality of touch electrodes and a plurality of driving signal transmission lines corresponding to the touch electrodes. A plurality of via-holes is arranged at an identical amount and in an identical manner at a region where each touch electrode is located, and each driving signal transmission line is connected to the corresponding touch electrode through the via-hole. Projections of the via-holes at the regions where the touch electrodes other than the corresponding touch electrode are located in a direction perpendicular to the substrate are not located on the driving signal transmission line.