Adhesive Sheet and UV Adhesive for Display Panel Lamination
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Solution Overview
Problem
Existing liquid crystal displays face issues with adhesive strength between rigid and elastic layers, potential contact between touch panels and semiconductor chips, risk of semiconductor chip breakage, and inefficient charge discharge in IPS-type panels.
Innovation Solution
Incorporating an adhesive sheet with transparent adhesive material to securely attach elastic layers to rigid layers, ensuring the semiconductor chip's thickness is smaller than the combined thickness of the polarizer and substrate to prevent contact, and using a conductive tape for efficient charge discharge in IPS-type panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ultraviolet-curing adhesive material is used to adhere the front window to the touch panel, then the adhesive strength is improved, but the elastic layer cannot be straightened before adhesion due to insufficient adhesive strength during the process
Solution Approach 1:
The patent applies preliminary action by using a first adhesive material to straighten and preliminarily adhere the elastic layer before the final ultraviolet-curing adhesion process. This preliminary step allows the elastic layer to be properly positioned and straightened without requiring the final strong adhesive to be active during the straightening process, thus resolving the contradiction between needing strong adhesive strength and needing ease of manufacture.
2Adaptability or versatility
If the touch panel is made larger than the polarizer, then the touch functionality is improved, but the touch panel may contact the semiconductor chip mounted on the liquid crystal panel
Solution Approach 1:
The patent resolves this contradiction by introducing a vertical dimension solution - mounting the semiconductor chip on the lower surface of the liquid crystal panel rather than on the upper surface where the touch panel extends. This allows the touch panel to be larger than the polarizer for improved functionality while preventing contact with the semiconductor chip by placing it in a different spatial dimension (lower surface vs. upper surface).
3Ease of operation
If the semiconductor chip is mounted on the liquid crystal panel, then the electrical connection is improved, but the chip is at risk of breakage from impact
Solution Approach 1:
The patent applies dimensionality change by moving the semiconductor chip mounting location from the upper surface to the lower surface of the liquid crystal panel. This maintains electrical connection functionality while protecting the chip from impact breakage, as the lower surface positioning removes the chip from the direct impact path when the device is dropped or subjected to external forces.
4Ease of manufacture
If conventional adhesive methods are used, then the manufacturing process is simple, but the adhesive strength between rigid and elastic layers is insufficient
Solution Approach 1:
The patent applies composite materials by combining two different adhesive materials with complementary properties: a first adhesive material for initial straightening and adhesion, and a second ultraviolet-curing adhesive material for final strong bonding. This composite adhesive system achieves both ease of manufacture (through the simple two-step process) and high adhesive strength (through the properties of the ultraviolet-curing material), resolving the contradiction between manufacturing simplicity and adhesive strength.
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 enhances adhesive strength, prevents contact between touch panels and semiconductor chips, reduces the risk of chip breakage, and improves charge discharge efficiency in liquid crystal displays.
Implementation Method 1
an adhesive sheet which adheres the elastic layer to the rigid layer
Implementation Method 2
a conductive tape for efficient charge discharge in IPS-type panels
Data Source
AI summary
A portable device and method of manufacturing a display device includes a display panel having a glass substrate and a polarizer adhered to the glass substrate, a touch panel which is made of resin material and adhered to the polarizer of the display panel by a first adhesive material, and a front window which is made of glass and adhered to the touch panel by a second adhesive material. One of the first adhesive material and the second adhesive material is an adhesive sheet, and an other of the first adhesive material and the second adhesive material is an ultraviolet-curing adhesive material.