Touch Panel Sensing Series with Ladder-Like Bridge Lines
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Solution Overview
Problem
Traditional capacitive touch panels are prone to operational failures due to electrostatic discharge, which breaks metal jumper lines, leading to non-functional sensing series, as they require numerous jumper lines to connect sensing pads across junctions.
Innovation Solution
The touch panel design incorporates straight and ladder-like sensing series with alternative bridge lines, reducing the need for jumper lines by using second and third bridge lines that are parallel and made of different materials, with the third bridge lines crossing the first bridge lines, thereby minimizing the risk of breakage during electrostatic discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal jumper lines are used to connect sensing pads at junctions, then the sensing series can be completed, but the probability of breakage due to electrostatic discharge increases
Solution Approach 1:
The patent removes the metal jumper lines from the sensing series configuration. Instead of using separate jumper lines to connect sensing pads at junctions, the sensing series are designed to extend continuously through the junctions without requiring additional connecting elements, thereby eliminating the breakage risk associated with electrostatic discharge
Solution Approach 2:
The patent divides the sensing series into two types: straight sensing series that extend through junctions without interruption, and ladder-like sensing series that alternate directions at junctions. This segmentation allows the sensing series to navigate the grid structure without requiring vulnerable jumper line connections
2Ease of manufacture
If metal jumper lines are set at each junction to connect sensing pads, then the sensing series can be completed, but the number of metal jumper lines increases significantly
Solution Approach 1:
The patent merges the function of the sensing series with the bridge lines by designing the sensing series to extend continuously through the junctions. The bridge lines themselves serve as the connecting pathways for the sensing series, eliminating the need for separate jumper lines and reducing material quantity
Solution Approach 2:
The bridge lines in the patent serve multiple functions: they connect adjacent sensing pads to form sensing series, they provide structural support at junctions, and they enable both straight and ladder-like sensing series configurations without requiring additional specialized jumper line components
Data Source
AI summary
A touch sensor array includes a plurality of straight sensing series and a plurality of ladder-like sensing series. The straight sensing series are separated to each other. Each of the straight sensing series includes first sensing pads and first bridge lines, and each of the first bridge lines is connected to two adjacent first sensing pads. The ladder-like sensing series are separated to each other. Each of the ladder-like sensing series includes second sensing pads, second bridge lines and third bridge lines. The second bridge lines and the third bridge lines are alternatively disposed, and any two adjacent second sensing pads are connected through one of the second bridge lines or one of the third bridge lines. Each of the ladder-like sensing series crosses one of the first bridge lines.