Touch Screen Panel Double Routing Structure Sensitivity
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Solution Overview
Problem
As touch screen panels increase in size, the single routing structure for connecting sensing lines to sensing cells can lead to deteriorated touch sensing sensitivity due to increased distances between sensing cells and their corresponding lines.
Innovation Solution
Implementing a double routing structure for some sensing lines, where each line is electrically coupled to multiple sensing cells at both ends of the display region, and connecting these lines to pads through connection patterns without increasing the number of pads, thereby maintaining sensitivity and design margin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single routing structure is used to connect sensing lines to sensing cells, then the structure is simple and the number of pads is reduced, but touch sensing sensitivity deteriorates due to increased distances between sensing cells and corresponding lines
Solution Approach 1:
The routing structure is segmented into multiple paths (first routing path and second routing path) that extend in different directions from the pad part. This segmentation allows sensing lines to be routed more efficiently to sensing cells throughout the display region, reducing the maximum distance any sensing cell must traverse and thereby improving touch sensing sensitivity without increasing pad count.
2Area of stationary object
If the size of touch screen panel is enlarged, then the display area is increased, but the number of sensing cells increases and requires more pads if single routing is used
Solution Approach 1:
The double routing structure creates a universal framework where two routing paths serve multiple sensing cells simultaneously. The first routing path extends in a first direction and the second routing path extends in a second direction, allowing a single pad part to effectively serve a larger array of sensing cells through the coordinated use of both routing paths, thus supporting panel enlargement without proportional pad increase.
3Device complexity
If sensing lines are connected to sensing cells at distal ends only, then the routing is simplified, but sensing sensitivity varies across different regions of the display
Solution Approach 1:
The routing structure implements local quality by providing direction-specific routing paths optimized for different regions. The first routing path is optimized for sensing cells in the first direction while the second routing path serves sensing cells in the second direction, ensuring that each local region has an appropriately optimized routing path that minimizes distance and maintains high sensing sensitivity.
Data Source
AI summary
Disclosed here is a touch screen panel capable of implementing a double routing structure without increasing the number of pads of a pad part by implementing some sensing lines of first and second sensing lines that are electrically coupled to first and second sensing cells arranged on a display region, in the double routing structure, and electrically coupling the sensing lines implemented in the double routing structure to the pads of the pad part through connection patterns.