Capacitive Touch Panel Bridge Structure for Reverse Signal Suppression
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Solution Overview
Problem
On-cell capacitive touch panels without cover lens and optical clear adhesive (OCA)/optical clear resin (OCR) experience strong reverse signals, leading to poor multi-touch sensing performance.
Innovation Solution
The capacitive touch panel incorporates a laminated structure with a touch sensing module featuring touch sensor patterns that include specific electrode configurations and a bridge structure, providing insulation and effective signal suppression to mitigate reverse signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the on-cell capacitive touch panel is designed without cover lens and OCA/OCR to simplify laminated structure and reduce thickness, then the device complexity and thickness are reduced, but stronger reverse signals are generated and multi-touch sensing performance deteriorates
Solution Approach 1:
The touch sensor patterns are segmented into multiple sub-electrodes (first sub-electrode, second sub-electrode, third sub-electrode, fourth sub-electrode) with different slope sections. This segmentation allows each sub-electrode to be optimized for specific signal characteristics, enabling effective reverse signal suppression while maintaining multi-touch sensing capability without requiring cover lens and OCA/OCR layers
Solution Approach 2:
Different sections of the touch sensor patterns have different local qualities through varying slope designs. The first sub-electrode and second sub-electrode have slopes symmetric to a first direction, while the third sub-electrode and fourth sub-electrode have slopes symmetric to a second direction. This local quality variation enables targeted suppression of reverse signals in different regions while preserving multi-touch sensing performance
2Length of stationary object
If the on-cell capacitive touch panel is designed without cover lens and OCA/OCR to reduce thickness, then the length of the touch panel structure is reduced, but reverse signal strength increases and touch signal sensing capability deteriorates
Solution Approach 1:
The touch sensor patterns employ asymmetric slope designs in the sub-electrodes. The first sub-electrode and second sub-electrode have slopes symmetric to a first direction of a first axis, while the third sub-electrode and fourth sub-electrode have slopes symmetric to a second direction of the first axis. This asymmetric configuration creates directional sensitivity that suppresses reverse signals while maintaining accurate touch signal detection capability
Solution Approach 2:
The bridge structure serves as an intermediary element disposed at the intersection of the first axis and second axis. It bridges the second electrode and provides insulation between the second electrode and the first electrode, enabling effective signal separation and suppression of reverse signals while maintaining thin profile without cover lens and OCA/OCR
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively suppresses reverse signals, enhancing touch signal sensing and preventing poor multi-touch performance, even without cover lens and OCA/OCR, thereby improving the overall sensing capability.
Implementation Method 1
The bridge structure is disposed at an intersection of the first axis and the second axis and used for bridging the second electrode and providing insulation between the second electrode and the first electrode
Implementation Method 2
This invention relates to a touch panel, especially to an on-cell capacitive touch panel
Data Source
AI summary
A capacitive touch panel is disclosed. A touch sensing module in its laminated structure includes same touch sensor patterns. Each touch sensor pattern includes a first electrode, a second electrode and a bridge structure. The first electrode includes a first sub-electrode˜a fourth sub-electrode and the second electrode includes a fifth sub-electrode˜an eighth sub-electrode formed by sections of conductive material having different slopes. First sub-electrode and second sub-electrode are symmetrical to a first direction of a first axis; third sub-electrode and fourth sub-electrode are symmetrical to a second direction of first axis. Fifth sub-electrode and sixth sub-electrode are symmetrical to a third direction of a second axis; seventh sub-electrode and eighth sub-electrode are symmetrical to a fourth direction of second axis. The bridge structure disposed at intersection of first axis and second axis bridges second electrode and provides insulation between second electrode and first electrode.