Transparent Adhesive Geometry for Display Panel Flatness
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Solution Overview
Problem
Display devices with stepped spaces between the window, touch panel, and display panel are vulnerable to external impacts and difficult to maintain flatness due to inadequate adhesion and separation issues.
Innovation Solution
The use of optically transparent adhesive members with varying moduli and geometries, where the first adhesive member protrudes convexly to cover the touch printed circuit board and the second adhesive member is recessed concavely to expose the touch panel surface, creating a space for attachment and reducing the likelihood of detachment and external force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single adhesive member is used to bond the window, touch panel, and display panel, then the structure is simple, but stepped spaces form at the edges causing vulnerability to external impacts and poor flatness
Solution Approach 1:
The adhesive bonding system is divided into multiple adhesive members (first adhesive member between window and touch panel, second adhesive member between touch panel and display panel) with different geometries and material properties. This segmentation allows each adhesive member to be optimized for its specific bonding interface, preventing stepped spaces at edges and eliminating vulnerability to external impacts while maintaining structural reliability.
2Ease of manufacture
If adhesive members with uniform geometry are used, then manufacturing is simple, but separation spaces form between panels reducing flatness
Solution Approach 1:
Different adhesive members are designed with non-uniform geometries tailored to their specific bonding interfaces. The first adhesive member has a first geometry optimized for bonding the window to the touch panel, while the second adhesive member has a second geometry optimized for bonding the touch panel to the display panel. This local optimization of adhesive geometry at each interface eliminates separation spaces and maintains panel flatness while remaining manufacturable.
3Adaptability or versatility
If adhesive members with identical material properties are used, then material selection is simple, but detachment occurs under external forces
Solution Approach 1:
The adhesive members are designed with different material properties (different moduli) to match the mechanical characteristics of the panels they bond. The first adhesive member has material properties suited for bonding the window to the touch panel, while the second adhesive member has different material properties optimized for bonding the touch panel to the display panel. This parameter optimization prevents detachment under external forces while maintaining broad adhesive compatibility.
Data Source
AI summary
A display device includes a first panel including a pad side area at one side of the first panel, a first optically transparent adhesive member on one surface of the first panel, a printed circuit board including a first attachment portion attached to the one surface of the first panel at the pad side area, a window on the first optically transparent adhesive member, a second optically transparent adhesive member on the other surface of the first panel, and a second panel on the second optically transparent adhesive member opposite the first panel, wherein the pad side area has a connection area at which the printed circuit board is attached to the first panel, and at which an edge of the first optically transparent adhesive member extends beyond an edge of the second optically transparent adhesive member, and a non-connection area at which the printed circuit board is not attached.