Matrix Switching Touch Panel Reducing Signal Line Visibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional matrix switching type touch panels face issues with visible boundaries between transparent electrodes and areas without electrodes, leading to patterning marks and increased visibility of signal lines due to differences in penetration ratio, reflectance, and color, as well as increased resistance and parasitic capacitance with longer signal lines.
Innovation Solution
A matrix switching type touch panel design featuring unit electrodes made of transparent electroconductive material with protrusions and bridges that connect them, arranged in a zig-zag pattern to reduce visibility, and multiple unit signal lines aligned in rows to minimize resistance and visibility of signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transparent electrodes are patterned to form touch pads and signal lines, then the touch panel structure is defined and signal transmission is enabled, but the boundaries between electrode areas and non-electrode areas become visible due to differences in penetration ratio, reflectance, and color
Solution Approach 1:
The patent applies color changes by introducing a compensatory transparent electrode layer that optically compensates for the visual differences between electrode and non-electrode areas. This layer is specifically designed to match the optical properties (penetration ratio, reflectance, color) of the underlying electrode patterns, thereby eliminating visible boundaries and patterning marks while maintaining signal transmission functionality.
Solution Approach 2:
The compensatory transparent electrode layer acts as an intermediary element between the patterned electrodes and the external environment. This intermediate layer smooths out the optical discontinuities caused by the electrode patterns, serving as a visual mediator that prevents the underlying electrode structure from being directly observable while allowing electrical signals to pass through.
2Adaptability or versatility
If signal lines are made longer to connect touch pads and driving circuit, then the connection range is extended, but the resistance and parasitic capacitance increase
Solution Approach 1:
The patent applies segmentation by dividing the signal line into multiple parallel segments or strands rather than using a single long line. This segmentation reduces the overall resistance and parasitic capacitance by distributing the electrical path across multiple parallel conductors, thereby maintaining signal quality over extended connection ranges while enabling greater design flexibility.
3Reliability
If signal lines are made wider to reduce resistance, then the resistance decreases, but the boundaries between signal lines become more visible
Solution Approach 1:
The patent segments the signal line into multiple narrower parallel conductors rather than using fewer wider lines. This segmentation achieves the dual benefit of reducing resistance through parallel paths while simultaneously reducing visibility, as the narrower individual segments are less visually prominent and their boundaries are less noticeable than those of wider signal lines.
Solution Approach 2:
The patent transitions from a two-dimensional view of signal lines to a three-dimensional structure by introducing multiple layers or stacked conductors. This dimensional change allows the signal transmission function to be distributed across multiple narrow segments in the vertical or depth dimension, thereby reducing the visual footprint and boundary visibility in the horizontal plane while maintaining low resistance through parallel conduction paths.
Data Source
AI summary
Provided herein is a matrix switching type touch panel comprising a plurality of touch pads disposed in a visible area on a substrate in a dot matrix format, the touch pads spaced from one another, and a plurality of signal lines disposed in a space between the touch pads, each signal line connecting a touch pad and a touch driving circuit of a invisible area, wherein the matrix switching type touch panel comprises: unit electrodes made of a transparent electroconductive material and disposed within a visible area on the substrate; touch pad areas each determined in an area corresponding to each touch pad; signal line areas each determined in an area corresponding to each signal line; and bridges electrically connecting the plurality of unit electrodes disposed in each touch pad area and each signal line area, configuring touch pads and signal lines.