Woven Touch Panel Electrode Structure for Ghost Phenomenon Reduction
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Solution Overview
Problem
Touch display devices face challenges in manufacturing complexity and cost due to the large number of signal lines and touch channels, and they often experience a 'ghost phenomenon' where unintended touch points are recognized during multi-touching.
Innovation Solution
A touch display device with a new type of touch panel that reduces the number of signal lines and touch channels by strategically arranging electrodes and signal lines, and incorporates a woven type electrode structure to disconnect charge transmission paths, preventing the ghost phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional touch panel with multiple touch electrodes and routing lines is used, then touch sensing function is provided, but manufacturing complexity and cost increase
Solution Approach 1:
The touch panel is divided into multiple regions with different electrode configurations. Specifically, a first region has touch electrodes arranged in a first pattern while a second region has touch electrodes arranged in a second pattern. This segmentation allows different areas to use optimized structures for their specific functions, reducing overall manufacturing complexity while maintaining sensing capability.
Solution Approach 2:
The touch panel structure is designed to serve multiple functions through different electrode arrangements. The same touch panel substrate can accommodate both first and second electrode patterns that serve different sensing purposes, eliminating the need for separate touch panels for different functions and thereby reducing manufacturing steps and cost.
2Area of stationary object
If the size of touch panel increases, then display area increases, but number of signal lines and touch channels increases leading to higher manufacturing cost
Solution Approach 1:
Multiple touch channels are merged into fewer signal lines by using the woven electrode structure. The interlaced pattern of first and second electrode groups allows multiple sensing functions to be achieved through shared signal lines, reducing the total number of signal lines required for large touch panels.
Solution Approach 2:
The electrode arrangements utilize different spatial dimensions and patterns. By arranging electrodes in alternating patterns across different regions and using both horizontal and vertical orientations, the design efficiently covers large areas while minimizing the number of independent signal lines needed.
3Reliability
If conventional touch panel structure is used, then touch sensing is achieved, but ghost phenomenon occurs during multi-touching
Solution Approach 1:
The touch panel is segmented into multiple regions with different electrode patterns. This segmentation prevents charge transmission paths that cause ghost phenomena by isolating different sensing zones. When a touch occurs in one region, the segmented structure prevents false charge signals from appearing in other regions, eliminating ghost touches.
Solution Approach 2:
The woven electrode structure converts the potential harmful effect of charge transmission into a beneficial isolation mechanism. The interlaced pattern of electrodes naturally blocks charge transmission paths between regions, turning what could be a source of ghost phenomena into a protective feature that prevents false touch detection.
Data Source
AI summary
Embodiments of the present disclosure relate to a touch display device and, more particularly, to a touch display device including a touch panel that can reduce the number of signal lines and the number of touch channels and can prevent or reduce a ghost phenomenon in multi-touching. In particular, the touch display device includes a woven type touch panel in which touch electrodes are formed by disposing electrodes to be entangled and electrically connecting the entangled electrodes such that electrically disconnected points exist, thereby being able to reduce the number of signal lines and the number of touch channels and prevent or reduce a ghost phenomenon in multi-touching.