Capacitive Touch Panel Meshed Electrode Shading Reduction
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Solution Overview
Problem
Capacitive touch panels with meshed metallic layers experience uneven shading due to variations in line widths and dislocations during the bonding process, leading to moire issues when integrated with display devices, which affect the visibility of the image on the touch operation surface.
Innovation Solution
The input device features a meshed conductive layer with conductive lines divided at intersecting sections in a direction matching the width of the lines, minimizing the area of the dividing section and ensuring uniformity, thereby suppressing uneven shading and enhancing image visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If meshed metallic layers are used to reduce electrode resistance, then electrical conductivity is improved, but uneven shading and moire issues occur due to line width variations and bonding dislocations
Solution Approach 1:
The conductive layer is divided into multiple independent conductive lines arranged in a mesh pattern, where each line is separated by insulating regions. This segmentation allows independent control of line widths and positions, enabling uniform patterning that reduces uneven shading while maintaining low resistance through the distributed mesh structure
Solution Approach 2:
The patent applies different line width dimensions in different orientations (X-direction and Y-direction lines have different widths) to optimize both electrical conductivity and visual uniformity. The insulating regions between lines are specifically designed to prevent dislocation visibility, creating local quality variations that resolve the uniformity issue
2Manufacturing precision
If meshed conductive layers with tilted lines are used to avoid moire, then visibility is improved, but manufacturing complexity increases due to precise angle control requirements
Solution Approach 1:
The patent employs asymmetric line width design where conductive lines in the X-direction have different widths than those in the Y-direction. This asymmetry, combined with specific tilting angles, creates a pattern that naturally avoids moire effects while simplifying the patterning process by using standard photolithographic techniques rather than requiring precise angular control
3Manufacturing precision
If conductive lines are made thinner to reduce shading impact, then visibility is improved, but electrical conductivity decreases
Solution Approach 1:
The patent transitions from considering only line width to utilizing both line width and line spacing (pitch) as independent design parameters. By increasing the spacing between thinner conductive lines while maintaining appropriate connectivity, the design achieves reduced visual shading impact while preserving electrical conductivity through the distributed mesh architecture
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 configuration results in uniform areas of conductive lines, reducing uneven shading and improving the visibility of the image on the display surface by minimizing the impact of patterned meshed conductive layers on the touch operation surface.
Implementation Method 1
capacitive touch panels...configured to detect a change in capacitance corresponding to a touch operation or proximity operation with a finger of an operator between adjacent electrodes as an input operation
Data Source
AI summary
An input device having a row electrode and a column electrode made by patterning a meshed metallic layer by forming a dividing section on a metallic line constituting the meshed metallic layer can make areas of individual dividing sections of the metallic lines uniform, whereby uneven shading due to the patterned, meshed conductive layer is suppressed from appearing on a touch operation surface.In the input device having the row electrode and the column electrode made by patterning the meshed metallic layer by forming the dividing section on the metallic line constituting the meshed metallic layer, at an intersecting section where metallic lines Mw2 constituting a meshed conductive layer Lp2 intersects an ideal contour Sp2 of a meshed column electrode, the direction for dividing the metallic lines at the intersecting section is set to the direction matching the direction of width of the metallic lines such that the area of the dividing section traversing the metallic line is minimal.