Display Panel Bonding Motion for Edge Adhesion Uniformity
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Solution Overview
Problem
Adhesion reliability between the display panel and the cover member deteriorates at the end portion, leading to incomplete joining and visible lifting, which affects the display device's integrity.
Innovation Solution
A manufacturing apparatus and method involving a lower and upper chamber with a driver to control the upper chamber's movement, allowing for precise application and diffusion of an adhesive layer along the edges of the cover member, ensuring complete adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple joining method is used, then manufacturing complexity is reduced, but adhesion reliability at the end portion deteriorates
Solution Approach 1:
The upper chamber is made movable to dynamically adjust the interval between chambers during the joining process. The chamber moves in multiple directions (first direction to decrease interval, second direction to increase interval) to control adhesive diffusion and prevent edge lifting, transforming a static joining process into a dynamic one that adapts to adhesion requirements at different locations.
Solution Approach 2:
The joining process employs periodic motion of the upper chamber, alternating between moving in the first direction (to press and spread adhesive) and the second direction (to increase interval and prevent excessive adhesive flow). This periodic action ensures uniform adhesive distribution and reliable adhesion at the end portions without requiring complex additional components.
2Reliability
If the upper chamber moves only in the first direction, then adhesion at the end portion improves, but adhesive may excessively diffuse and cause defects
Solution Approach 1:
The system performs a preliminary action of moving the upper chamber in the second direction (increasing interval) before or during the adhesive setting process, anticipating and preventing the harmful effect of excessive adhesive diffusion. This preliminary anti-action counterbalances the adhesive spreading force, maintaining uniform adhesive layer thickness and preventing defects at the end portions.
Solution Approach 2:
The movement of the upper chamber is controlled based on feedback from the adhesion process. The chamber moves in the first direction to enhance adhesion when needed, then moves in the second direction to correct any excessive adhesive diffusion, creating a feedback-controlled process that maintains adhesive layer uniformity while ensuring reliable end portion adhesion.
Data Source
AI summary
A manufacturing apparatus of a display device includes: a lower chamber configured to support a display panel; an upper chamber opposite the lower chamber and configured to support a cover member; and a driver configured to drive the upper chamber and to control the upper chamber to sequentially move in a first direction, to firstly move by a first distance in a second direction that is opposite to the first direction, and to secondly move by a second distance in the second direction.