Curved Pressing Pad for Bubble-Reduced Display Bonding
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Solution Overview
Problem
The challenge in manufacturing display devices is the occurrence of bubbles and damage during the bonding process of the cover window and display panel, which affects the integrity and functionality of the device.
Innovation Solution
The use of a pressing pad with specific geometric configurations, including a first fixing portion and a pressing portion with curved surfaces, and an alignment portion, to align and bond the cover window and display panel, minimizing stress and bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressing pad with curved surfaces is used to bond the cover window and display panel, then bubble formation is reduced, but device complexity increases
Solution Approach 1:
The pressing pad incorporates curved surfaces including a first curved surface on the pressing portion, a second curved surface on the side surface, and a third curved surface at the corner. These curved surfaces match the curvature of the cover window, enabling uniform contact and pressure distribution during bonding, which effectively reduces bubble formation between the cover window and display panel.
2Strength
If pressing force is applied during bonding, then bonding strength is improved, but damage to the display device increases
Solution Approach 1:
The pressing pad features locally optimized curved surfaces at different positions: the first curved surface on the pressing portion for uniform pressure application, the second curved surface on the side surface to prevent edge damage, and the third curved surface at the corner to eliminate stress concentration points. This local quality differentiation allows effective bonding while minimizing damage.
Solution Approach 2:
The curved surfaces of the pressing pad are designed to match the curvature of the cover window in advance, creating a cushioning effect that distributes pressing force uniformly across the bonding interface. This prevents localized stress concentration that could cause damage to the display device during the bonding process.
3Area of stationary object
If the radius of curvature of the pressing pad is smaller than the cover window, then contact area is improved, but stress concentration increases
Solution Approach 1:
The pressing pad employs multiple curved surfaces with carefully controlled radii of curvature. The first curved surface has a radius that provides sufficient contact area with the cover window, while the second and third curved surfaces at the edges and corners have larger radii to distribute stress and prevent concentration at critical locations.
Data Source
AI summary
An apparatus for manufacturing a display device includes: a pressing pad including a first fixing portion and a pressing portion on the first fixing portion. The pressing portion includes: a first surface on an opposite side with respect to the first fixing portion; a second surface between the first surface and the first fixing portion; and a third surface extending between the first surface and the second surface. The second surface is a circular curved surface that is inwardly depressed.