Display Apparatus Dual Adhesive Sheet Bubble Prevention
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Solution Overview
Problem
Existing display apparatuses with protective covers suffer from reduced visibility due to air layers and display quality degradation from aging transparent resins or adhesive sheets, and face challenges in preventing bubble formation and maintaining shock resistance when using adhesive sheets.
Innovation Solution
A display apparatus design featuring a frame with an opening, a protective cover, and two transparent adhesive sheets, where the first sheet is in contact with the display surface and has dimensions matching the opening edges, and the second sheet bonds with the protective cover, with a bonding member filling the gaps to prevent air layers and bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent resin is used to fill the gap between display panel and protective cover, then visibility is improved, but display quality deteriorates with age due to yellowing
Solution Approach 1:
The bonding structure is divided into two separate transparent adhesive sheets: a first adhesive sheet positioned within the frame opening that bonds the display panel to the frame, and a second adhesive sheet positioned between the frame and protective cover that bonds these components together. This segmentation prevents the need for a single thick adhesive layer, eliminating the yellowing problem while maintaining visibility.
2Manufacturing precision
If transparent adhesive sheet is provided only on display surface to prevent bubbles, then display quality is improved, but shock resistance decreases due to reduced bonding area
Solution Approach 1:
The bonding function is segmented between two adhesive sheets positioned at different locations. The first adhesive sheet is positioned within the frame opening (not extending to edges) to prevent bubbles at step heights, while the second adhesive sheet extends to bond the frame and protective cover, collectively providing both bubble prevention and adequate shock resistance through distributed bonding.
Solution Approach 2:
The frame serves as an intermediary component that mediates between the display panel and protective cover. The first adhesive sheet bonds the display panel to the frame within the opening, while the second adhesive sheet bonds the frame to the protective cover, allowing bubble prevention at the display surface while maintaining overall structural strength through the frame's intermediary role.
3Strength
If transparent adhesive sheet extends over frame opening edges to ensure bonding, then shock resistance is improved, but bubbles are included at step heights degrading display quality
Solution Approach 1:
The bonding function is segmented between two adhesive sheets: the first adhesive sheet is deliberately positioned within the frame opening and does not extend to the opening edges, preventing bubble formation at step heights. The second adhesive sheet is positioned between the frame and protective cover to provide the necessary bonding strength, thus segmenting the bonding locations to avoid bubbles while maintaining strength.
Solution Approach 2:
The solution moves the bonding function to another dimension by introducing a second adhesive sheet at a different location (between frame and protective cover rather than directly at the display surface edges). This dimensional separation allows the first adhesive sheet to stay within the opening without edge extension, preventing bubbles, while the second adhesive sheet provides the necessary bonding strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances display quality by eliminating air layers and bubbles, maintains high shock resistance, and reduces material and assembly costs, while allowing for easier adhesive sheet placement and improved manufacturing efficiency.
Implementation Method 1
a bonding member is charged in a gap formed by the frame, the display panel, the first transparent adhesive sheet, and the second transparent adhesive sheet, so as to bond the frame, the display panel, the first transparent adhesive sheet, and the second transparent adhesive sheet
Data Source
AI summary
A display apparatus is provided which realizes high display quality without inclusion of bubbles when a protective cover is bonded over the display surface of the display panel with a transparent adhesive sheet therebetween. A display surface of a display panel and a protective cover are bonded with first and second transparent adhesive sheets. The first transparent adhesive sheet has a cross-sectional area vertical to the thickness direction that is formed smaller than the opening area of an opening of a frame, and it is provided within the opening. Then, a bonding member is charged into a gap formed by the frame, display panel, first transparent adhesive sheet, and second transparent adhesive sheet, so as to bond the frame, display panel, first transparent adhesive sheet, and second transparent adhesive sheet.