Differential Adhesive Double-Sided Tape for LCD Optical Film Alignment
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Solution Overview
Problem
During maintenance of liquid crystal displays, the double-sided tape is often left on the liquid crystal panel when separating from the backlight unit, disrupting the position relationship of optical films and preventing the display from functioning properly.
Innovation Solution
A double-sided tape with a first adhesive of lower adhesion strength on the liquid crystal panel and a second adhesive of higher adhesion strength on the optical films, ensuring the tape separates from the panel and remains with the optical films, maintaining their position and allowing the display to reassemble correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the double sided tape is used to adhere the backlight unit to the liquid crystal panel, then the backlight unit is firmly fixed, but the tape is likely to be left on the liquid crystal panel during separation, damaging the optical films
Solution Approach 1:
The patent applies different adhesive formulations to different surfaces of the same double-sided tape. The first adhesive (on the panel-facing side) has lower adhesion strength to allow clean separation, while the second adhesive (on the backlight unit-facing side) has higher adhesion strength for firm fixation. This local differentiation of adhesive properties resolves the contradiction between strong bonding and clean separation.
Solution Approach 2:
The adhesive system is segmented into two distinct adhesive layers with different properties. The first adhesive layer is designed with specific viscosity and adhesion characteristics for the liquid crystal panel, while the second adhesive layer has different characteristics optimized for the backlight unit. This segmentation allows each adhesive to perform its specific function independently.
2Ease of repair
If external forces are applied to separate the liquid crystal panel and backlight unit, then maintenance can be performed, but the double sided tape may detach from the optical films and disrupt their position relationship
Solution Approach 1:
The differential adhesive strength creates a controlled separation path during maintenance. The weaker first adhesive fails first, allowing the tape to remain attached to the backlight unit and optical films while detaching from the liquid crystal panel. This ensures the optical films maintain their precise position relationships during the separation process required for maintenance.
3Ease of manufacture
If the same adhesive is used on both surfaces of the double sided tape, then the manufacturing process is simple, but the adhesion strength cannot be controlled differently for different surfaces
Solution Approach 1:
The patent implements local quality by applying different adhesive formulations to different surfaces of the double-sided tape. The first adhesive has lower viscosity and lower adhesion strength optimized for the liquid crystal panel, while the second adhesive has higher viscosity and higher adhesion strength optimized for the backlight unit. This allows the tape to exhibit different adhesive behaviors on different surfaces, providing adaptability while maintaining a relatively simple manufacturing process.
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
Prevents damage to the optical films' position relationship, ensuring the liquid crystal display functions normally after reassembly by ensuring the tape separates from the panel and remains with the optical films.
Implementation Method 1
a first surface coated with a first adhesive and connected to the liquid crystal panel through the first adhesive
Implementation Method 2
a second surface coated with a second adhesive and connected to the back plate and the set of optical films respectively through the second adhesive
Data Source
AI summary
A liquid crystal display and a double sided tape therefor are provided. The liquid crystal display comprises: a liquid crystal panel; a backlight unit comprising a back plate, a set of optical films, and a frame; and a double sided tape comprising a first surface coated with a first adhesive and connected to the liquid crystal panel through the first adhesive, and a second surface coated with a second adhesive and connected to the back plate and the set of optical films respectively through the second adhesive. The adhesion strength of the first adhesive on the liquid crystal panel is lower than that of the second adhesive on the set of optical films. After the backlight unit is separated from the liquid crystal panel, the double sided tape can be left on the optical films and the frame. Therefore, the position relationship among the films within the set of optical films would not be damaged, ensuring that the reassembled liquid crystal display can work normally.