Touch Sensor Raised Rim Routing Circuit Design
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Solution Overview
Problem
Conventional touch sensors with decorative print layers on the frame portion reduce the display area and weaken signal detection due to narrow routing circuit wiring, and the glass substrates lack sufficient reinforcement, making them prone to breakage upon impact.
Innovation Solution
A touch sensor design featuring a transparent substrate with a flat center and raised outer rim, where the transparent conductive film layer is at the center and the routing circuit with a decorative print layer is at the rim, along with chemical reinforcement of the glass substrate, enhancing impact resistance and allowing for a thinner frame without compromising signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the decorative print layer is placed at the frame portion to conceal the routing circuit, then the routing circuit can be hidden, but the display area becomes smaller
Solution Approach 1:
The patent moves the decorative print layer from the two-dimensional frame plane to the three-dimensional outer rim surface. By utilizing the vertical dimension and the curved outer rim of the transparent substrate, the decorative layer can conceal the routing circuit while not occupying the flat display area, thus resolving the contradiction between circuit concealment and display size.
2Area of stationary object
If the frame width is reduced to achieve narrow framing, then the display area ratio increases, but the routing circuit wire width and space must be narrowed which increases resistance and weakens signal detection
Solution Approach 1:
The patent relocates the routing circuit from the narrow horizontal frame space to the outer rim surface, utilizing the vertical and circumferential dimensions. This allows the routing circuit to maintain adequate wire width and spacing for reliable signal detection while the frame width is minimized, achieving narrow framing without compromising electrical performance.
3Strength
If the glass substrate surface is reinforced by chemical treatment, then surface strength improves, but the side face portion remains weak and edged-shaped making it prone to breakage upon impact
Solution Approach 1:
The patent forms a raised outer rim structure on the glass substrate that creates a composite geometry combining the chemically treated surface layer with a thickened rim structure. This composite structure provides both surface strength from chemical treatment and impact resistance from the increased rim thickness, preventing breakage when impact forces are applied to the side faces.
Data Source
AI summary
A touch sensor with an ornament includes a transparent substrate with a flat center part and a raised outer rim part, and a film substrate based transparent conductive sensor with a transparent conductive film layer attached to the inner face of the transparent substrate. A transparent conductive film layer circuit of the transparent conductive film layer is formed at the flat center part, and a routing circuit for detecting an electric signal from the transparent conductive film layer circuit and a decorative print layer for concealing the routing circuit are formed at the raised outer rim part.