Touch Screen Panel Outside Wiring Lines Slit Design
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Solution Overview
Problem
Conventional touch screen panels experience signal distortion due to varying resistance and capacitance values in outside wiring lines, which affects the accurate detection of touch events.
Innovation Solution
The formation of slits in the outside wiring lines reduces the widths of conductive paths, increasing resistance values while maintaining capacitance values, thereby equalizing electrical characteristics across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If outside wiring lines are formed with uniform width, then manufacturing is simplified, but resistance values vary due to different line lengths affecting signal accuracy
Solution Approach 1:
The patent applies local quality by introducing slits at specific locations along the outside wiring lines to locally modify the conductive path width. This creates non-uniform resistance distribution along the wiring lines, compensating for the varying lengths and equalizing the electrical characteristics without changing the overall manufacturing process complexity
Solution Approach 2:
The patent changes the physical parameter of the conductive path width by introducing slits of different lengths and positions. This modifies the resistance values of individual wiring lines to achieve uniform electrical characteristics across all lines, resolving the contradiction between manufacturing simplicity and measurement precision
2Measurement precision
If conductive path width is reduced to equalize resistance values, then touch detection accuracy improves, but signal strength decreases
Solution Approach 1:
The slits are strategically positioned and sized to create local resistance adjustments only where needed. This allows precise control over resistance equalization while minimizing the impact on overall signal strength, as the conductive path remains intact in most sections
Solution Approach 2:
The patent uses partial action by introducing slits that reduce the conductive path width only in specific sections rather than uniformly across the entire wiring line. This achieves the necessary resistance adjustment without excessively reducing the overall signal strength
Data Source
AI summary
A touch screen panel including a substrate comprising an active area and a non-active area positioned outside the active area, first and second sensing electrodes formed over the active area, wherein the first sensing electrodes connected along a first direction, and wherein the second sensing electrodes connected along a second direction that intersects the first direction, and outside wiring lines formed in the non-active area to connect the first and second sensing electrodes to an external driving circuit in units of lines and having at least one of slits that cross insides of the outside wiring lines so that widths of conductive paths are reduced in partial sections.