Asymmetric Sealant Width for Display Substrate Adhesion
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Solution Overview
Problem
Existing display devices face challenges in maintaining strong adhesion between substrates without increasing the frame size, particularly in liquid crystal display panels, where the removal of insulating films can lead to reduced adhesion strength and potential detachment issues.
Innovation Solution
A display device design featuring a first substrate with an inorganic insulating film, an organic insulating film, and a driver connected to wiring, where a sealant is applied with varying widths to enhance adhesion, including a wider first seal portion along the mount unit and narrower second seal portions, and a groove in the organic insulating film to increase contact area, thereby suppressing detachment and allowing for a narrower frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the insulating film is partially removed to increase adhesion strength, then the frame size can be reduced, but the adhesion strength may be insufficient and detachment may occur
Solution Approach 1:
The patent applies different widths of sealant at different locations: a first seal portion with a first width along the mount unit, and a second seal portion with a second width (narrower than the first) in other regions. This local differentiation allows the mount unit area to have enhanced adhesion while other areas use narrower sealant to reduce frame size.
Solution Approach 2:
The sealant is divided into multiple segments with different widths: the first seal portion along the mount unit and the second seal portion in other regions. This segmentation allows each region to have optimized sealant width according to its specific adhesion requirements.
2Length of stationary object
If the sealant width is reduced to narrow the frame, then the frame size decreases, but the adhesion strength between substrates is compromised
Solution Approach 1:
The patent implements local quality by providing the first seal portion with a greater width specifically at the mount unit where strong adhesion is critical, while the second seal portion has a narrower width in non-mount areas where full adhesion strength is less critical, thus narrowing the overall frame.
Solution Approach 2:
The sealant structure is made asymmetric with respect to width: the first seal portion along the mount unit has a different (greater) width than the second seal portion in other regions. This asymmetric design optimizes adhesion where needed while minimizing frame width overall.
3Reliability
If the sealant is applied uniformly with sufficient width to ensure adhesion, then the adhesion strength is maintained, but the frame size increases
Solution Approach 1:
Rather than applying uniform sealant width throughout, the patent applies local quality by providing greater sealant width (first width) specifically at the mount unit where adhesion is most critical, and narrower sealant width (second width) in other regions, thus maintaining necessary adhesion while reducing overall frame size.
Solution Approach 2:
The patent applies partial action by providing excessive sealant width only where necessary (at the mount unit with the first seal portion) rather than uniformly across the entire frame, and uses minimal sufficient width (second width) in other regions where full adhesion strength is less critical.
Data Source
AI summary
According to one embodiment, A display device includes a first substrate includes an inorganic insulating film, a first wiring formed above the inorganic insulating film, an organic insulating film located above the inorganic insulating film and the first wiring, and a driver electrically connected to the first wiring, a second substrate opposing the first substrate, and a sealant fixing the first substrate and the second substrate, wherein the sealant comprises a first seal portion formed along a first edge of the first substrate and a second seal portion which crosses the first seal portion, and the first seal portion has a first width, and the second seal portion has a second width, the first width being greater than the second width.