Lamination Pad Structure for Reducing Display Panel Wrinkles
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Solution Overview
Problem
Existing display devices face issues such as wrinkles and defects during the lamination process of the display panel and protection window, which are not adequately addressed by current pressing members like silicone pads.
Innovation Solution
A pad for lamination comprising a first pad applying pressure to the edge area of the display panel and a second pad applying pressure to the central area, with differing hardness and friction coefficients, allowing sequential bonding to minimize defects like wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single silicone pad is used to press the display panel during lamination, then the structure is simple and easy to operate, but wrinkles and defects occur on the display panel surface
Solution Approach 1:
The single silicone pad is divided into multiple pads (first pad and second pad) that can independently apply pressure to different areas of the display panel. This segmentation allows each pad to be optimized for its specific function - the first pad for edge area pressure and the second pad for central area pressure - thereby eliminating wrinkles while maintaining operational simplicity.
Solution Approach 2:
Different pads are assigned to different spatial locations on the display panel with distinct properties. The first pad contacts the edge area while the second pad contacts the central area, allowing localized pressure application tailored to the specific needs of each region. This local quality approach prevents wrinkles by applying appropriate pressure only where needed.
2Device complexity
If uniform pressure is applied across the entire display panel, then the lamination process is simple, but wrinkles form in the central area while edges may not bond properly
Solution Approach 1:
The pressure application system is segmented into multiple independent pads that can be positioned at different locations (edge and central areas). Each pad applies pressure independently to its designated zone, allowing the system to achieve complex bonding requirements through simple modular components.
Solution Approach 2:
Different regions of the display panel are treated with different pressure characteristics. The edge area receives pressure from the first pad while the central area receives pressure from the second pad, creating local quality variations in pressure application that prevent wrinkles and ensure proper bonding throughout the panel.
3Ease of manufacture
If a single pad with uniform hardness is used, then the manufacturing process is simple, but cannot simultaneously bond edges and stretch central area effectively
Solution Approach 1:
Pads with different hardness values are assigned to different functional zones. The first pad (with first hardness) is positioned for edge area contact while the second pad (with second hardness) is positioned for central area contact. This allows the edge bonding and central stretching functions to be performed simultaneously with optimized pressure characteristics for each function.
Solution Approach 2:
The hardness parameter of the pressing members is varied across different pads to match the specific requirements of different regions. By changing the hardness parameter from the first pad to the second pad, the system achieves both effective edge bonding and central area stretching without complicating the manufacturing process.
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
The described pad system effectively reduces the occurrence and size of wrinkles in the display panel by applying tailored pressures to different areas, enhancing the manufacturing process of display devices.
Implementation Method 1
a first pad which applies a first pressure to a first area of a display panel
Implementation Method 2
the first pad may have a first friction coefficient
Implementation Method 3
a second pad which applies a second pressure to a second area different from the first area of the display panel
Implementation Method 4
the second pad may have a second friction coefficient different from the first friction coefficient
Implementation Method 5
the second pad stretches the central area of the display panel
Data Source
AI summary
A pad for lamination includes a first pad which applies a first pressure to a first area of a display panel, and a second pad which is at least partially surrounded by the first pad in a plan view and which applies a second pressure to a second area different from the first area of the display panel. After the first pad fixes at least a portion of the first area of the display panel, the second pad stretches the second area of the display panel, such that a display device may be manufactured in which defects such as, for example, wrinkles of the display panel which may occur in a lamination process are minimized in quantity or reduced in size.