Adhesion Roller and Limiting Device for Bubble-Free Touch Panel Bonding
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Solution Overview
Problem
The existing optical bonding process for adhering touch panels to liquid crystal displays in smartphones faces challenges with bubble discharge and relative movement between the panels, leading to low productivity due to the lack of effective fixation and controlled adhesion processes.
Innovation Solution
A system comprising a controlling module, an adhering roller, and a limiting device is used to determine and control the moving speeds of these components, ensuring the roller rolls along the touch panel to discharge bubbles while the limiting device prevents movement, thereby ensuring accurate adhesion and increasing productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the TP is not fixed by a fixing device during adhesion, then the device complexity is reduced, but relative movement between the TP and LCD occurs leading to poor manufacturing precision
Solution Approach 1:
The limiting device is positioned and configured in advance within the vacuum metal cavity to prevent TP movement before adhesion begins. The mechanical hand places the TP onto the pre-positioned limiting device, ensuring immediate fixation and preventing relative movement between TP and LCD during the adhesion process.
2Manufacturing precision
If additional time is spent to make the metal cavity in vacuum state to discharge bubbles, then the adhesion quality improves, but the productivity decreases
Solution Approach 1:
The adhering roller is introduced as a separate component that actively removes bubbles from the adhesion interface. By rolling across the TP surface, it extracts trapped air bubbles and OCA excess, achieving complete bubble discharge without requiring extended vacuum holding time, thus maintaining high productivity.
Solution Approach 2:
The adhering roller continuously moves across the TP surface from one side to the other, maintaining continuous bubble discharge action throughout the adhesion process. This continuous mechanical action ensures complete bubble removal while minimizing the time the vacuum cavity needs to maintain vacuum state.
3Ease of operation
If the TP is manually moved by a mechanical hand, then the ease of operation is improved, but relative movement during adhesion occurs leading to poor manufacturing precision
Solution Approach 1:
The limiting device serves as an intermediary between the mechanical hand and the LCD. The mechanical hand easily places the TP onto the limiting device without precise positioning requirements, while the limiting device itself ensures precise alignment and prevents movement during adhesion, combining ease of operation with manufacturing precision.
Data Source
AI summary
A system for controlling adhesion between a touch panel (TP) and a liquid crystal display (LCD). The system includes a controlling module, an adhering roller, and a limiting device. The controlling module is configured to determine a first moving speed of the adhering roller and a second moving speed of the limiting device. The adhering roller is configured to roll along a first direction from a first side of the TP to a second side of the TP at the first moving speed. The limiting device is configured to move along a second direction at the second moving speed and prevent the TP from moving with respect to the LCD.