One Glass Solution Touch Panel Moisture Resistance
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Solution Overview
Problem
In one glass solution touch panels, the thickness and surface roughness of light-shielding layers can cause disconnections in conductive films and increase the resistance of sensor electrodes due to moisture absorption by planarizing films, leading to unreliable connections between sensor electrodes and wiring lines.
Innovation Solution
A configuration with a planarizing film covering the light-shielding layer only in the non-sensing area, forming a forward taper at the edge adjacent to the sensing area, and using a two-layer terminal structure to reduce resistance and prevent disconnections, while ensuring the sensor electrodes remain unaffected by moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light-shielding layer is formed to cover the non-sensing area, then the wiring lines and terminals are not visible to users, but the conductive film may be disconnected due to height difference caused by the light-shielding layer
Solution Approach 1:
A planarizing film is introduced as an intermediary layer between the light-shielding layer and the conductive film. This planarizing film fills the height difference created by the light-shielding layer, providing a flat surface that ensures reliable connection of the conductive film without visibility issues.
2Object-affected harmful factors
If the light-shielding layer is made thick to exhibit light-shielding properties, then light-shielding effectiveness is improved, but the amount of light exposure in the pattern edge becomes insufficient, making it difficult to form a forward taper
Solution Approach 1:
The light-shielding function is segmented from the planarizing function. The light-shielding layer provides light-shielding properties while the separate planarizing film provides the flat surface needed for manufacturing, allowing each layer to be optimized for its specific function.
3Manufacturing precision
If a planarizing film is formed over the entire surface to cover the light-shielding layer, then surface flatness is improved, but the planarizing film absorbs moisture during manufacturing, increasing resistance of thin sensor electrodes
Solution Approach 1:
The planarizing film is applied locally only to the non-sensing area where the light-shielding layer is present, rather than covering the entire surface. This ensures surface flatness is improved where needed while preventing moisture absorption that would affect the sensor electrodes in the sensing area.
4Ease of manufacture
If sensor electrodes are made thin to not be visible to users, then aesthetic appearance is improved, but the resistance of sensor electrodes increases due to moisture and impurities
Solution Approach 1:
The planarizing film acts as a protective intermediary layer that prevents moisture and impurities from contacting the thin sensor electrodes, allowing the electrodes to remain thin for aesthetics while maintaining low resistance for reliable operation.
Data Source
AI summary
Provided is a highly reliable configuration of a one glass solution touch panel, in which a sensor electrode and a wiring line can be reliably connected to each other. A touch panel (1) is provided with: an insulating substrate (10) having a sensing area (V) and a non-sensing area (P); sensor electrodes (11, 12), which are formed in the sensing area (P); terminals (13), which are formed in the non-sensing area (P); wiring lines (14), which electrically connect the sensor electrodes (11, 12) and the terminals (13); a light-shielding layer (171), which is formed to cover the non-sensing area (P); and a planarizing film (172), which is formed to cover the light-shielding layer (171). The planarizing film (172) is formed only in the non-sensing area (P).