Touch Panel Electrode Via Distribution for Irregular Geometries
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Solution Overview
Problem
Existing touch panels with irregularly shaped touch areas, such as those with rounded corners or notches, face challenges in maintaining effective electrical connections due to differences in touch electrode block shapes, leading to degraded touch detection performance, especially when the radius of the rounded corners is large.
Innovation Solution
A touch panel design featuring an array of regular and irregularly shaped touch electrode blocks, where the irregularly shaped blocks are electrically connected by a varying number of contact vias along straight lines, ensuring a uniform distribution and improved touch detection performance by adapting the electrode block layout to the shape of the touch area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If irregularly shaped touch electrode blocks are used to adapt to rounded corners or notches, then the touch area geometry is improved, but the touch detection performance deteriorates due to non-uniform contact via distribution
Solution Approach 1:
The patent applies local quality by making different parts of the touch electrode block have different properties. Specifically, the touch electrode block is divided into different regions (first region and second region) with different via densities. The first region has a higher via density to compensate for the reduced area at rounded corners or notches, while the second region maintains normal via density. This ensures uniform via distribution across the entire touch area, resolving the contradiction between adapting to irregular geometries and maintaining touch detection performance.
2Ease of manufacture
If the number of contact vias is reduced in irregularly shaped touch electrode blocks, then the manufacturing complexity is reduced, but the electrical connection reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the via density parameter in different regions of the touch electrode block. Instead of using a uniform via density across the entire block, the via density is increased in the first region (which has smaller area due to rounded corners or notches) and kept normal in the second region. This parameter adjustment ensures that the total number of vias is optimized for each region, maintaining electrical connection reliability while adapting to the irregular geometry.
Data Source
AI summary
A touch panel including a substrate, an insulating layer, touch electrode blocks, and electrode lines. The touch electrode blocks include an array of first type touch electrode blocks having a regular shape and a second type touch electrode block having an irregular shape. Ones of the first type touch electrode blocks are electrically connected to respective ones of the electrode lines by respective X first contact vias extending through the insulating layer, and the respective X first contact vias are arranged along a straight line in a column direction. The second type touch electrode block is electrically connected to a first corresponding one of the electrode lines by Y second contact vias extending through the insulating layer, and the Y second contact vias are arranged along at least one straight line in the column direction. X and Y are natural numbers, and 0.75×X≤Y≤1.25×X.