Multi-Layer Touch Pad Layout for High-Density Display Panels
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Solution Overview
Problem
The challenge of increasing the number of touch pads in a display panel while maintaining reliability and minimizing space is not adequately addressed in existing technologies, leading to potential short circuits and reduced touch sensitivity.
Innovation Solution
The solution involves arranging touch pads on multiple layers, with pad lines hidden from exposure, and using different layers for adjacent pad connections to prevent shorts and reduce space, thereby increasing the number of touch pads without compromising reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of touch pads is increased to improve touch sensitivity, then touch sensitivity is improved, but the risk of short circuits increases and reliability deteriorates
Solution Approach 1:
The patent transitions from a planar arrangement of touch pads to a three-dimensional stacked configuration where touch pads are arranged on multiple layers. This vertical stacking allows increased touch pad density without increasing the horizontal footprint, thereby improving touch sensitivity while maintaining adequate spacing to prevent short circuits and preserve reliability.
Solution Approach 2:
The patent segments the touch pad array into multiple independent layers, with each layer containing a subset of touch pads. This segmentation allows each layer to be independently routed and connected to the touch driving circuit through separate link lines, reducing the probability of system-wide failures and preventing short circuits between adjacent pads.
2Measurement precision
If the number of touch pads is increased to enhance touch sensitivity, then touch sensitivity is improved, but the space required increases
Solution Approach 1:
The patent utilizes the vertical dimension by stacking touch pads on multiple layers rather than expanding horizontally. This allows a large number of touch pads to be accommodated within the same planar footprint, significantly increasing touch sensitivity without increasing the overall display panel area.
3Ease of manufacture
If pad lines are exposed to outside to simplify manufacturing, then ease of manufacture is improved, but the risk of short circuits increases and reliability deteriorates
Solution Approach 1:
The patent nests the pad lines within the display panel structure, embedding them between functional layers rather than exposing them on the surface. The pad lines are integrated into the internal architecture of the display panel, connected to touch pads through vias and conductive structures, which protects them from environmental damage and prevents short circuits while maintaining manufacturability through standard semiconductor fabrication processes.
Data Source
AI summary
Embodiments of the present disclosure are related to a touch display device, as disposing a plurality of touch pads located on a plurality of lines alternatively and making a metal other than the touch pad not to expose to outside, the number of the touch pads being capable of disposing on a pad area can be increased and a reliability of the touch pad can be maintained. Furthermore, as disposing pad lines, electrically connected to the touch pad and located adjacently, on different layers, a short between adjacent pad lines can be prevented and a space between the touch pads can be reduced or minimized, a disposition structure of the touch pad can be implemented easily according to increasing the number of channels in a large size of the touch display device.