Non-Adhesive Pattern for Air Bubble Discharge in Touch Sensing Units
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Solution Overview
Problem
Air bubbles formed between films during the manufacturing process of display devices, such as touch sensing units and display panels, lead to defects as they are not effectively discharged, causing the display panel to become defective.
Innovation Solution
Incorporating a non-adhesive pattern on the second area of a first film, which forms an air path between the first and second films, allowing air bubbles to be discharged to the outside, thereby preventing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible printed circuit is disposed on the first film, then electrical connection and flexibility are achieved, but air bubbles are trapped between the films causing defects
Solution Approach 1:
A non-adhesive pattern is formed on the first film before assembling the display device. This preliminary action creates predetermined air paths that allow air bubbles to escape during the lamination process, preventing them from being trapped between the flexible printed circuit and the first film, thus eliminating defects while maintaining electrical connection and flexibility.
Solution Approach 2:
The non-adhesive pattern acts as an intermediary element between the first film and the flexible printed circuit. It creates controlled air paths that facilitate the escape of air bubbles during assembly, serving as a mediator that resolves the conflict between achieving tight adhesion for electrical connection and allowing air bubble escape to prevent defects.
2Strength
If films are laminated tightly during manufacturing, then adhesion strength is improved, but air bubbles cannot be discharged and defects occur
Solution Approach 1:
The non-adhesive pattern creates a localized region with different adhesion properties on the first film. While most areas maintain strong adhesion for structural integrity and electrical connection, the non-adhesive pattern area provides controlled low adhesion to create air paths, allowing air bubbles to escape without compromising overall adhesive strength.
Solution Approach 2:
The non-adhesive pattern serves as an intermediary structure that reconciles the contradiction between tight adhesion and air bubble discharge. It allows the majority of the film interface to maintain strong bonding while providing specific localized pathways for air bubble escape during the lamination process.
3Object-generated harmful factors
If the non-adhesive pattern is made wider, then air bubble discharge is improved, but the area for adhesive bonding is reduced
Solution Approach 1:
The non-adhesive pattern is designed with specific width and positioning to provide adequate air bubble discharge pathways while minimizing the reduction of adhesive bonding area. The pattern is strategically placed in regions where reduced adhesion is acceptable, maintaining overall structural integrity while enabling effective air bubble escape.
Solution Approach 2:
The non-adhesive pattern provides sufficient air path width to enable effective air bubble discharge without creating excessively wide non-adhesive regions. The design strikes an optimal balance where the non-adhesive pattern is wide enough to allow air bubble escape but narrow enough to preserve adequate adhesive bonding area for structural strength.
Data Source
AI summary
A display device including a first film, a flexible printed circuit, and a second film. The first film includes a substrate and a non-adhesive pattern, where the substrate includes a first area and a second area adjacent to the first area, and the non-adhesive pattern is formed on at least a portion of the second area. The flexible printed circuit is disposed on the first area of the first film. The second film is disposed on the flexible printed circuit and the first film.