Single-Layer Touch Sensor Structure for Display Devices
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Solution Overview
Problem
Touch display devices face challenges in manufacturing due to complex touch panel structures, leading to low yield and high costs, as well as difficulties in designing pad areas with increasing touch channels and electrodes, and sensitivity issues due to signal path length differences.
Innovation Solution
A touch display device with a single-layered touch sensor structure that reduces the number of mask processes and touch pads, using intersecting X and Y touch electrode lines with connecting lines that bypass and surround each other to maintain sensitivity despite differences in signal path lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layered touch sensor structure is used, then touch sensitivity can be improved, but manufacturing complexity increases and manufacturing yield decreases
Solution Approach 1:
The patent combines multiple touch sensor layers into a single-layer structure where X-touch electrode lines and Y-touch electrode lines are arranged to intersect and form touch sensing nodes. This merging approach maintains touch sensitivity while eliminating the need for complex multi-layer stacking processes, thereby reducing manufacturing complexity and improving yield
Solution Approach 2:
The patent uses intersecting electrode lines arranged in different directions (X-direction and Y-direction) within a single layer to create three-dimensional touch sensing capability. The intersection points of these lines form virtual touch nodes without requiring physical stacking, thus achieving multi-layer functionality in a single layer
2Adaptability or versatility
If the number of touch electrodes and touch channels is increased, then touch panel size and functionality are improved, but the number of touch pads increases making pad area design difficult
Solution Approach 1:
The patent designs electrode connecting lines that serve multiple functions: they connect touch electrodes in series, provide signal transmission paths, and reduce the number of required touch pads. By making the connecting lines multi-functional, the patent reduces pad requirements while maintaining enhanced touch functionality
Solution Approach 2:
The patent segments the touch electrode lines into X-direction and Y-direction lines that intersect to form a grid pattern. This segmentation allows the system to handle more touch channels with fewer pads by using the intersection points as sensing nodes rather than requiring separate pads for each electrode
3Area of stationary object
If signal transmission paths of different lengths are used in touch electrode lines, then electrode coverage area is improved, but touch sensitivity deteriorates due to signal path length differences
Solution Approach 1:
The patent arranges X-touch electrode lines and Y-touch electrode lines to intersect in a balanced manner, creating symmetrical signal transmission paths. This equipotential arrangement ensures that signal paths from different directions have comparable lengths and characteristics, maintaining touch sensitivity across the entire coverage area
Solution Approach 2:
The patent uses asymmetric arrangement of electrode connecting lines in different directions (X and Y directions) to compensate for path length differences. By making the line arrangements asymmetric relative to each other but symmetric in their intersection pattern, the patent balances the overall signal transmission characteristics
Data Source
AI summary
The present disclosure relates to a touch display device and a touch sensing method, and more specifically, to a touch display device and a touch sensing method that provides a single-layered touch sensor structure by a touch electrode connecting line that electrically connects touch electrodes arranged in one direction and is arranged to bypass and surround touch electrodes arranged in another direction, thereby enabling a simple manufacturing process, a high manufacturing yield, and a low manufacturing cost.