Loop-Shaped Wiring Reduces Touch Sensor Visibility
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Solution Overview
Problem
The visibility of wiring patterns in touch sensors and pressure sensors used in display devices deteriorates the display quality, as they can be visually recognized on the screen.
Innovation Solution
A thin film-type touch sensor design is implemented, featuring loop-shaped first lines and electrode units arranged in a specific pattern to reduce visibility, with resistance lines and connection lines forming a mesh structure that minimizes pattern visibility and allows for simultaneous formation with electrode units and signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wiring pattern is used in the touch sensor and pressure sensor, then the sensors can function properly, but the wiring structures become visually recognizable on the display screen, deteriorating display quality
Solution Approach 1:
The wiring pattern is divided into multiple separate line segments that are spaced apart from each other. Instead of continuous metal traces, the patent uses discontinuous line patterns where adjacent lines are separated by gaps, preventing the formation of visible continuous patterns on the display screen while maintaining electrical connectivity through the segmented structure.
Solution Approach 2:
The patent applies different properties to different regions of the wiring structure. The line patterns are designed with varying orientations (first direction and second direction crossing each other) and spacing in different areas of the sensor, creating local variations that reduce overall pattern visibility while maintaining sensor functionality in each region.
2Object-affected harmful factors
If the wiring structures are made thinner to reduce visibility, then display quality improves, but the manufacturing precision requirements increase
Solution Approach 1:
By segmenting the wiring into multiple thin lines with gaps between them, the patent reduces the width of individual wiring elements to below the visual resolution threshold while maintaining adequate spacing that relaxes manufacturing tolerance requirements compared to a single thick trace.
Solution Approach 2:
The patent transitions from conventional single-layer wiring to a multi-directional pattern where lines extend in first and second directions that cross each other. This dimensional approach distributes the wiring function across multiple orientations, allowing each individual line to be thinner while the collective structure maintains electrical connectivity.
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
The design effectively reduces the visibility of wiring structures, enhancing display quality by allowing the touch sensor and pressure sensor to be integrated into the display device without compromising image clarity.
Implementation Method 1
The loop-shaped first lines include resistance lines extending in the first direction and connection lines extending in the second direction. Some of the resistance lines, which are adjacent in the second direction, are connected by a connection line among the connection lines.
Implementation Method 2
The loop-shaped first line is disposed between some of the electrode units, which are adjacent in the second direction. The connection lines are spaced apart from each other in the first direction.
Data Source
AI summary
A touch sensor includes a base layer, electrode units, and loop-shaped first lines. The electrode units are disposed on the base layer. The electrode units are arranged in a first direction and a second direction crossing the first direction. The loop-shaped first lines are in a same layer as the electrode units. The loop-shaped first lines are disposed between some of the electrode units, which are adjacent in the second direction. The loop-shaped first lines include resistance lines extending in the first direction and connection lines extending in the second direction. Some of the resistance lines, which are adjacent in the second direction, are connected by a connection line among the connection lines. The connection lines are spaced apart from each other in the first direction.