Liquid Crystal Display Face Plate Adhesion via Non-Uniform Pressure-Sensitive Adhesive
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Solution Overview
Problem
Miniaturized liquid crystal display devices in mobile phones face challenges in reducing thickness while maintaining mechanical strength and image quality, as thin glass substrates lead to mechanical weakness and image duplication issues due to external protection mechanisms.
Innovation Solution
A liquid crystal display device with a three-layer pressure-sensitive adhesive structure, where the first adhesive member adheres to the face plate and the second to the upper polarizer, with the first being thicker and covering a printed frame, ensuring strong adhesion and preventing image duplication by using a face plate made of acrylic resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of the liquid crystal display panel is reduced to achieve miniaturization, then the profile size is reduced, but the mechanical strength deteriorates and the panel becomes prone to breaking
Solution Approach 1:
A face plate is introduced as an intermediary protective element mounted on the screen side of the liquid crystal display panel. The face plate serves as a mediator that absorbs external mechanical forces and protects the thin liquid crystal display panel from breaking, resolving the contradiction between reduced thickness and maintained mechanical strength.
2Strength
If a face plate is mounted at a distance from the liquid crystal display panel to prevent force transmission, then mechanical protection is improved, but image quality deteriorates due to duplicate image phenomenon
Solution Approach 1:
A pressure-sensitive adhesive material is introduced as a mediator between the face plate and the liquid crystal display panel. This adhesive layer enables the face plate to be mounted in close proximity to the panel, simultaneously providing mechanical protection while preventing the duplicate image phenomenon that occurs with spaced mounting.
Solution Approach 2:
The mounting distance parameter is changed from a spaced configuration to a close-proximity configuration enabled by the pressure-sensitive adhesive material. This parameter change resolves the contradiction by allowing the face plate to be sufficiently close to prevent image duplication while still providing mechanical protection.
3Shape
If a printed frame is formed on the face plate for design aesthetics, then appearance is improved, but adhesion between the face plate and liquid crystal display panel deteriorates
Solution Approach 1:
The pressure-sensitive adhesive material is designed with non-uniform thickness to accommodate the printed frame structure. The adhesive thickness is increased in regions where the frame is present, ensuring sufficient adhesion force in these areas while maintaining overall aesthetic appearance. This local quality adjustment resolves the contradiction between design aesthetics and adhesion reliability.
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 effectively bonds the face plate to the liquid crystal display panel, enhancing mechanical strength and image quality by preventing adhesion defects and allowing for easy repair, while maintaining design aesthetics.
Implementation Method 1
a pressure-sensitive adhesive material interposed between the upper polarizer and the face plate
Data Source
AI summary
A face plate on which a frame is formed for improved design aesthetics is bonded to a top surface of an upper polarizer of a liquid crystal display panel with a pressure-sensitive adhesive material. The frame on the face plate is formed from five layers of printing. The pressure-sensitive adhesive material has a three-layer structure having a first pressure-sensitive adhesive member, a base material, and a second pressure-sensitive adhesive member. The first pressure-sensitive adhesive member is formed thicker than the second pressure-sensitive adhesive member, and hence the pressure-sensitive adhesive material can maintain a necessary thickness above the frame formed on the face plate. The reliability of adhesion between the face plate and the liquid crystal display panel is thus improved.