Curved Pad Recesses for Display Lamination Pressure Control
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Solution Overview
Problem
Current lamination processes for display devices face challenges in achieving high yield and preventing damage to the display panel during the lamination of windows and panels, particularly due to uneven pressure distribution and potential cracking from double-curved surfaces.
Innovation Solution
A lamination apparatus featuring a jig with bent side surfaces and a pad with recesses and curved side surfaces is used to align and press the display panel, allowing for controlled pressure application that reduces stress on the panel's boundaries and minimizes the risk of cracking, while the recesses on the pad distribute pressure evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional lamination apparatus is used to laminate the window and display panel, then the lamination process can be completed, but the display panel may suffer from uneven pressure distribution and potential cracking, reducing manufacturing yield
Solution Approach 1:
The pressing surface of the pad is designed with a curved shape corresponding to the curved surface of the display panel. This curvature matching ensures uniform contact and pressure distribution across the entire panel surface, preventing stress concentration that could lead to cracking during the lamination process
2Ease of manufacture
If uniform pressure is applied across the entire display panel during lamination, then the lamination process is simple, but stress concentration occurs at panel boundaries, causing cracking
Solution Approach 1:
The pad incorporates recesses at specific locations corresponding to panel boundaries where stress concentration is most likely to occur. This creates a non-uniform pressure distribution pattern that locally reduces stress at vulnerable areas while maintaining adequate pressure elsewhere, preventing cracking without complicating the overall lamination process
Solution Approach 2:
The pad design预先 (in advance) accounts for potential stress concentration points by incorporating recesses at predetermined positions before the lamination process begins. This preliminary structural configuration prevents cracking proactively rather than requiring complex real-time adjustments during lamination
3Device complexity
If the pad has a flat pressing surface, then the pad structure is simple, but pressure distribution is uneven on curved display panels, causing bubbles and defects
Solution Approach 1:
The pressing surface is shaped with curvature that matches the display panel's surface geometry. This curved design enables the pad to conform to the panel shape, ensuring uniform pressure distribution across the entire contact area and preventing bubble formation, while adding only minimal structural complexity
Solution Approach 2:
The pad combines a curved pressing surface with localized recesses at specific positions. This creates a composite structure where the overall curvature provides general pressure uniformity, while local recesses provide targeted pressure reduction at stress-prone areas, achieving high manufacturing precision with controlled complexity
Data Source
AI summary
A lamination apparatus including a jig and a pad disposed facing the jig. The jig may include an accommodation groove, which is defined by a bottom surface, a first side surface bent and extending from the bottom surface, and a second side surface bent and extending from the bottom surface. The pad includes a pressing surface facing the bottom surface, a first pad side surface bent from the pressing surface in a direction away from the jig, a second pad side surface bent from the pressing surface in a direction away from the jig, a connection surface connecting the first pad side surface to the second pad side surface, and a recess recessed from the pressing surface, the connection surface, and the first pad side surface.