Curved Window Lamination with Pressure Sensor Array
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Solution Overview
Problem
Conventional lamination devices for side-view display devices with curved cover windows face challenges in uniformly adhering the display panel and cover window due to differences in pressure distribution across flat and curved surfaces, leading to potential adhesion failures and non-uniform contact.
Innovation Solution
A lamination device equipped with a pressure sensor array featuring stretchable substrates and electrodes on both flat and curved surfaces, which measures and distinguishes pressures at different locations, ensuring precise pressure application and control through a controller that adjusts the movement of jigs based on real-time pressure data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional lamination device is used for side-view display devices with curved cover windows, then the lamination process can be performed, but uniform adhesion cannot be achieved due to pressure distribution differences across flat and curved surfaces
Solution Approach 1:
The pressure sensor array divides the pressure measurement function into multiple independent sensing units distributed across different surfaces (flat and curved). Each sensor unit independently measures local pressure, enabling segmented control of pressure application to achieve uniform adhesion across surfaces with different curvatures.
Solution Approach 2:
The lamination device dynamically adjusts pressure distribution based on real-time feedback from the pressure sensor array. The system transitions from static pressure application to dynamic pressure control, allowing continuous optimization of pressure distribution across flat and curved surfaces during the lamination process.
2Reliability
If pressure is applied uniformly across the lamination surface, then the process is simple to control, but adhesion failures occur on curved surfaces due to insufficient pressure
Solution Approach 1:
The pressure sensor array provides real-time feedback on pressure distribution across the lamination surface. This feedback is used to dynamically adjust pressure application, ensuring that sufficient pressure is applied to curved surfaces while maintaining appropriate pressure on flat surfaces, thereby improving adhesion reliability without excessive complexity.
Solution Approach 2:
The system applies different pressure characteristics to different regions of the lamination surface. Curved surfaces receive enhanced pressure application compared to flat surfaces, with each region optimized for its specific geometric characteristics. This local quality approach ensures reliable adhesion across diverse surface types.
3Measurement precision
If a pressure sensor array is implemented to measure pressures at different locations, then precise pressure control is achieved, but device complexity increases
Solution Approach 1:
The pressure sensor array serves multiple functions simultaneously: it measures pressure magnitude, detects pressure distribution patterns, provides feedback for control optimization, and monitors adhesion quality. This multi-functionality reduces the need for separate measurement and control systems, mitigating the increase in device complexity.
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 solution enables uniform adhesion and pressure distribution across the display panel and cover window, preventing adhesion failures and ensuring consistent contact, thereby enhancing the reliability and performance of the lamination process.
Implementation Method 1
a pressure sensor array disposed on the pressure pad... a plurality of first electrodes that overlap the first surface; and a plurality of second electrodes that overlap the second surface
Data Source
AI summary
A lamination device includes a first jig to which is fixed a window that includes a flat surface and at least one curved surface, a pressure pad disposed on a second jig that faces the first jig, where the pressure pad includes a first surface that corresponds the flat surface of the window and a second surface that corresponds the at least one curved surface of the window, and a pressure sensor array disposed on the pressure pad. The pressure sensor array includes a plurality of first electrodes that overlap the first surface and a plurality of second electrodes that overlap the second surface.