Touch Panel Passivation Layer for Corrosion Prevention
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Solution Overview
Problem
The existing touch display devices, such as the GF2 type, face issues with increased total thickness and fabrication cost due to the exposure of touch panel lines outside the display panel, leading to corrosion and electrical openings from moisture and contaminants.
Innovation Solution
A passivation layer made of organic insulating material is formed in the exposing area of the touch panel using a coating or printing method, covering the lines to prevent corrosion and electrical openings, and is exposed outside the display panel instead of the lines, reducing the need for additional protective films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional protective films are added to cover exposed lines, then reliability is improved, but device complexity and total thickness increase
Solution Approach 1:
The patent merges the protective function with the existing passivation layer structure. The passivation layer is extended to cover not only the pixel electrode area but also the exposed lines in the non-display area, combining the protective function into the existing passivation structure rather than adding separate protective films.
Solution Approach 2:
The passivation layer serves multiple functions: it provides electrical insulation for the pixel electrode, protects against moisture and contaminants, and now also protects the exposed lines in the non-display area. This multi-functional approach eliminates the need for additional protective films.
2Reliability
If additional protective films are added to cover exposed lines, then reliability is improved, but total thickness increases
Solution Approach 1:
The protective function is merged into the existing passivation layer, which is already part of the display panel structure. By extending the passivation layer's coverage area rather than adding new layers, the total thickness is maintained while still providing protection against electrical opening.
3Reliability
If additional protective films are added to cover exposed lines, then reliability is improved, but fabrication cost increases
Solution Approach 1:
The protective function is combined with the existing passivation layer formation process. The passivation layer is formed using standard semiconductor fabrication techniques (such as spin coating and photolithography) that are already part of the manufacturing process, eliminating the need for additional protective films and associated costs.
4Device complexity
If the touch panel structure is simplified to reduce thickness, then device complexity is reduced, but lines become exposed and reliability deteriorates
Solution Approach 1:
The passivation layer is selectively extended to cover only the necessary areas - specifically the exposed lines in the non-display area - while maintaining the simplified overall structure. This localized approach provides protection where needed without adding complexity throughout the entire device.
Data Source
AI summary
A display device includes: a cover glass; a first adhesive layer under the cover glass; a touch film attached to the cover glass by the first adhesive layer; a passivation layer in an edge portion of a lower surface of the touch film; a second adhesive layer under the touch film; and a display panel attached to the touch film by the second adhesive layer, the passivation layer exposed outside the display panel.