Curved Display Window Bonding with UV Curing
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Solution Overview
Problem
Existing methods for attaching a window to a display panel often result in non-uniform adhesive layers and the formation of bubbles, leading to defects and reduced display quality, especially in curved flexible display devices.
Innovation Solution
A device and method utilizing a chamber with a display panel fixing unit and a window fixing unit, featuring complementary curved surfaces and an ultraviolet irradiating unit, where the adhesive layer is cured under vacuum conditions using ultraviolet light transmitted through an ultraviolet transmitting material, ensuring uniform bonding without bubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional bonding methods are used to attach window to display panel, then the bonding process can be completed, but the adhesive layer becomes non-uniform and bubbles form
Solution Approach 1:
The patent employs a vacuum environment within the bonding device to remove air and prevent bubble formation in the adhesive layer. The vacuum chamber creates an inert atmosphere that eliminates air pockets during adhesive application and curing, ensuring a uniform bubble-free bonding interface between the window and display panel.
Solution Approach 2:
The patent applies adhesive to the window or display panel surface before placing the components into the vacuum bonding chamber. This preliminary action allows the adhesive to be distributed uniformly on the surface before bonding, and the subsequent vacuum environment prevents bubble entrapment during the bonding process.
Solution Approach 3:
The patent replaces conventional thermal curing methods with ultraviolet (UV) light curing for the adhesive layer. UV curing provides rapid and uniform curing throughout the adhesive thickness without the thermal gradients that can cause bubbling, achieving precise and uniform bonding.
2Ease of manufacture
If conventional bonding methods are used, then the process is simple, but display quality deteriorates due to defects
Solution Approach 1:
The vacuum environment in the bonding device prevents bubble formation and eliminates air-related defects in the adhesive layer, directly improving display quality by ensuring a clear, defect-free bonding interface between the window and display panel.
Solution Approach 2:
The patent uses UV light curing instead of thermal curing to bond the adhesive layer. This method provides rapid, uniform curing that prevents defects and maintains high display quality while keeping the process efficient and relatively simple.
3Ease of manufacture
If adhesive is applied before bonding, then bonding can proceed, but bubbles form in the adhesive layer
Solution Approach 1:
The patent applies adhesive to the components before placing them in the vacuum bonding chamber. The vacuum environment then removes air pockets from the adhesive layer, preventing bubble formation while maintaining the ease of pre-application adhesive dispensing.
Solution Approach 2:
The adhesive is applied in advance to the window or display panel surface, allowing for easy and controlled application. The subsequent vacuum environment removes trapped air, and UV curing completes the bonding process, achieving both ease of manufacture and a bubble-free result.
4Manufacturing precision
If ultraviolet light is irradiated through window fixing unit, then adhesive cures uniformly, but the window fixing unit must be made of ultraviolet transmitting material
Solution Approach 1:
The patent makes the window fixing unit transparent to UV light in the specific regions where UV irradiation is required for adhesive curing. This local quality allows UV light to pass through the fixing unit and cure the adhesive uniformly between the window and display panel, while the rest of the device structure can use conventional materials.
Solution Approach 2:
The window fixing unit is constructed using materials that are transparent to UV light, such as certain plastics or glass. This composite material approach allows the fixing unit to perform both its mechanical function of holding the window and its optical function of transmitting UV light for adhesive curing.
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
This approach ensures a uniformly cured adhesive layer, preventing bubbles and improving adhesion between the window and display panel, thereby enhancing display quality and reducing defects.
Implementation Method 1
an ultraviolet irradiating unit on the window fixing unit, the ultraviolet irradiating unit being configured to irradiate ultraviolet light through the window fixing unit toward the first curved surface of the display panel fixing unit
Implementation Method 2
a chamber having an internal space
Data Source
AI summary
A device for bonding a window includes a chamber having an internal space, a display panel fixing unit in the chamber and including a first curved surface, the first curved surface being configured to attach to a flexible display panel, a window fixing unit in the chamber and including a second curved surface, at least part of the window fixing unit including an ultraviolet transmitting material, the second curved surface facing the first curved surface and being complementary with the first curved surface, and the second curved surface being configured to attach to a window, and an ultraviolet irradiating unit on the window fixing unit, the ultraviolet irradiating unit being configured to irradiate ultraviolet light through the window fixing unit toward the first curved surface of the display panel fixing unit.