Bonding Device With Deformable Pressing Pad For Display Panel Alignment
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Solution Overview
Problem
Existing bonding technologies for display devices often result in bonding defects between the display panel and the window, particularly at the bent portions, leading to suboptimal adhesion and potential structural weaknesses.
Innovation Solution
A bonding device comprising a support with through-holes, a diaphragm covering the support, a pressing pad with support bars, and a window fixing chuck with a groove, which allows for precise alignment and bonding of the display panel and window by moving the window fixing chuck to deform the pressing pad and expand the diaphragm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing bonding technologies are used to bond display panel and window, then bonding process can be completed, but bonding defects occur at bent portions leading to suboptimal adhesion
Solution Approach 1:
The diaphragm is pre-expanded to a predetermined curvature radius before bonding, and the pressing pad is pre-positioned with support bars at specific locations. This preliminary preparation ensures that when bonding occurs, the display panel and window are already in the correct alignment and curvature state, preventing bonding defects at bent portions without requiring high-precision real-time adjustment during the bonding process itself.
Solution Approach 2:
The patent changes the physical parameters of the bonding system by controlling the expansion degree of the diaphragm (predetermined curvature radius) and the position of the pressing pad. By adjusting these parameters, the system achieves optimal bonding conditions that prevent defects while maintaining manufacturing feasibility.
2Reliability
If pressure is applied to bond display panel and window, then adhesion is achieved, but pressure distribution may be uneven causing bonding defects
Solution Approach 1:
The pressing pad incorporates support bars at specific locations corresponding to bent portions of the display panel. These support bars provide localized support and pressure distribution, ensuring that critical areas (bent portions) receive appropriate pressure for bonding while preventing excessive or uneven pressure that would cause defects. The local quality of pressure application matches the local requirements of different areas of the display panel.
3Area of stationary object
If display panel is bent for edge-to-edge bonding, then bonding area is increased, but structural integrity may be compromised
Solution Approach 1:
The display panel is bent to a predetermined curvature radius before bonding, and the diaphragm is expanded to match this curvature. This preliminary shaping allows the panel to maintain its bent configuration throughout the bonding process, enabling edge-to-edge bonding across the entire perimeter while preserving structural integrity through controlled, uniform curvature rather than forced or uneven bending.
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 proposed bonding device effectively prevents bonding defects by ensuring proper alignment and pressure distribution between the display panel and window, enhancing the structural integrity and adhesion of the display device.
Implementation Method 1
a diaphragm disposed on the support to cover the support
Implementation Method 2
the pressing pad is deformable by a pressure caused by the window fixing chuck when the window fixing chuck moves such that the pressing pad is disposed in the groove
Data Source
AI summary
A bonding device includes: a support in which a plurality of through-holes is defined, a diaphragm disposed on the support to cover the support, a pressing pad disposed on the diaphragm over a top surface of the support, and a window fixing chuck disposed on the pressing pad and in which a groove facing the pressing pad is defined. Here, the pressing pad includes a pad and at least one support bar disposed in the pad and extending in a first direction.