Touch Panel Wiring Light Blocking Layer Design
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Solution Overview
Problem
Touch panels with input position detecting electrodes and peripheral wiring lines formed on a glass cover face issues with transparency degradation due to outgases from colored print layers, and visible flexible circuit board connections affect appearance.
Innovation Solution
A touch panel design where the input position detecting electrodes and peripheral wiring lines are formed on the second face of a glass cover, with a light blocking print layer on the lower layer side to hide the flexible circuit board connection and a colored print layer on the upper layer side, minimizing outgas impact and enhancing appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the peripheral wiring line is formed on the second face of the glass cover, then the number of parts is reduced and thickness and weight are reduced, but the connecting portion of the flexible circuit board becomes visible and the outward appearance is deteriorated
Solution Approach 1:
The print layer is segmented into two distinct functional layers: a light blocking print layer that hides the flexible circuit board connection, and a colored print layer that provides aesthetic appearance. This segmentation allows each layer to perform its specific function independently, resolving the contradiction between hiding connections and maintaining appearance.
Solution Approach 2:
The solution moves from a single-layer print structure to a multi-layer print structure on the second face of the glass cover. By adding the light blocking print layer beneath the colored print layer, the design utilizes the vertical dimension to simultaneously achieve connection hiding and aesthetic appearance.
2Shape
If a colored print layer is provided on the lower layer side than the peripheral wiring line to hide the mounting portion of the flexible circuit board, then the outward appearance is improved, but the transparency of the light transmitting conductor film is degraded significantly by outgas generated from the colored print layer
Solution Approach 1:
The light blocking print layer is formed first before the light transmitting conductor film, and the colored print layer is formed after the conductor film. This preliminary positioning of the light blocking layer provides a stable base that minimizes outgas interference during conductor film formation, while the subsequent colored layer is applied in a controlled manner that preserves conductor film transparency.
Solution Approach 2:
The print layers are selectively positioned in specific regions: the light blocking print layer is located in the peripheral region to hide the flexible circuit board, while the colored print layer is positioned to provide aesthetic appearance without interfering with the central inputting region where the conductor film transparency is most critical.
3Shape
If the colored print layer is formed on the overall peripheral region including the mounting region, then the flexible circuit board connection is hidden, but the transparency of the light transmitting conductor film is degraded by outgas from the print layer
Solution Approach 1:
The print layers are selectively positioned in specific regions: the light blocking print layer is located in the peripheral region to hide the flexible circuit board, while the colored print layer is positioned to provide aesthetic appearance without interfering with the central inputting region where the conductor film transparency is most critical.
Data Source
AI summary
Display panel is provided and includes substrate; conductive member that is arranged on substrate, and that configures input position detecting electrodes in display region; mounting terminal in mounting region existing in peripheral region that is outside display region; peripheral wiring lines disposed in peripheral region, peripheral wiring lines each having first end electrically connected to mounting terminal and second end connected to one of input position detecting electrodes; first light blocking layer arranged on substrate so as to overlap at least a part of peripheral wiring lines; and second light blocking layer arranged between substrate and peripheral wiring line, wherein first light blocking layer overlaps at least a part of second light blocking layer so as to partly sandwich peripheral wiring lines between first and second light blocking layers.