Resin Adhesive Layer for Display Panel Flatness and Contrast
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Solution Overview
Problem
Existing display devices with liquid crystal panels and touch panels suffer from reduced contrast due to light scattering and reflection from air layers, and touch panels bend when pressured, causing uneven displays.
Innovation Solution
A manufacturing method involving a first resin layer surrounding the display part, a communication part allowing inner and outer areas to communicate, and a second resin layer applied to ensure uniform adhesion and support, eliminating air layers and preventing touch panel deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an air layer is present between the liquid crystal panel and touch panel, then the structure is simple and easy to manufacture, but light scattering and reflection occur causing contrast reduction
Solution Approach 1:
A resin layer is introduced as an intermediary substance between the liquid crystal panel and touch panel to replace the air layer. This resin layer eliminates light scattering and reflection while maintaining the structural simplicity and ease of manufacture, thus resolving the contradiction between ease of manufacture and contrast quality.
2Device complexity
If the touch panel is supported only at its peripheral edge portion, then the structure is simple, but the panel bends under pressure causing uneven display
Solution Approach 1:
The resin layer serves multiple functions simultaneously: it acts as an adhesive bonding the panels, fills the gap between panels to provide uniform support across the entire touch panel surface, and prevents light scattering. This merging of functions eliminates the need for separate support structures while ensuring panel flatness under pressure.
3Stability of the object's composition
If the entire surface of the touch panel is supported by resin, then deflection is suppressed and display uniformity is improved, but air bubbles may be trapped reducing display quality
Solution Approach 1:
The resin is applied in a controlled manner before final assembly, allowing air to be gradually expelled as the resin spreads. The communication part design facilitates this preliminary air evacuation process, preventing air bubble entrapment while ensuring complete surface support for panel flatness.
4Strength
If transparent adhesive is applied to the center and spreads toward end portions, then adhesion is achieved, but adhesive flows outside causing defects
Solution Approach 1:
The resin application area is segmented into the inner area (display region) and outer area (peripheral region) separated by the communication part. This segmentation allows controlled resin flow and placement, ensuring adequate adhesion strength while preventing excessive adhesive overflow that would cause manufacturing defects.
Data Source
AI summary
A manufacturing method of the present invention is a manufacturing method of a display device with a functional film that is adhered to a principal plane of a display panel provided with a display part. A first resin layer is formed outside the display part on the principal plane to surround the display part, a communication part which allows an inner area surrounded by the first resin layer and an outer area outside of the first resin layer to communicate with each other in an in-plane direction of the principal plane is formed, the inner area is coated with a second resin, the functional film is superimposed on the principal plane, and the second resin is pressed and spread throughout the inner area and the communication part by pressing the functional film.