LCD Bezel Minimization via Segmented Tape and Anti-Adhesive Film
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Solution Overview
Problem
The challenge in manufacturing liquid crystal display devices is to minimize the size of the guide panel while maintaining the width of the double-sided tape, as the increased size of the liquid crystal display panel leads to longer double-sided tape strips, requiring high-precision cutting and increasing manufacturing costs, and the thermal expansion of the light guide plate causes wrinkles due to uneven adhesion.
Innovation Solution
The solution involves extending a part of the double-sided tape to the light guide plate and applying an anti-adhesive film with low surface energy to prevent adhesion between the light guide plate and the double-sided tape, maintaining the tape's width and eliminating wrinkles, thus allowing for easier processing and reduced manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the guide panel size is minimized to reduce bezel area, then the appearance is improved, but the double-sided tape becomes longer requiring high-precision cutting which increases manufacturing costs
Solution Approach 1:
The double-sided tape is divided into two functional segments: a first double-sided tape for adhering the guide panel to the reflective plate, and a second double-sided tape extending to the light guide plate for preventing thermal expansion wrinkles. This segmentation allows each tape segment to be optimized independently, with the first tape focused on precise positioning and the second tape focused on thermal management.
Solution Approach 2:
The second double-sided tape acts as an intermediary element between the guide panel and the light guide plate. It mediates the thermal expansion forces by providing a controlled adhesion interface, preventing the light guide plate from warping due to thermal stress while extending the tape beyond the minimal guide panel boundaries.
2Strength
If the double-sided tape width is maintained while guide panel size is reduced, then the structural integrity is preserved, but the tape extends beyond the guide panel requiring adhesion control to the light guide plate
Solution Approach 1:
Different regions of the double-sided tape system have different adhesion properties. The first double-sided tape region has strong adhesion to the guide panel for structural support, while the second double-sided tape region has controlled adhesion to the light guide plate to prevent thermal expansion without creating wrinkles. This local differentiation of adhesion quality resolves the conflict between maintaining strength and controlling adhesion.
Solution Approach 2:
The adhesion parameters of the double-sided tape are changed across different regions. The tape material or surface properties are modified to create varying adhesion strengths: high adhesion at the guide panel interface for structural integrity, and controlled/reduced adhesion at the light guide plate interface to allow thermal expansion without damage.
3Ease of manufacture
If the light guide plate thermal expansion is unrestricted, then the manufacturing process is simplified, but wrinkles occur on the reflective plate reducing display quality
Solution Approach 1:
The second double-sided tape is positioned in advance between the guide panel and the light guide plate to cushion against thermal expansion forces before they can cause wrinkles on the reflective plate. This preventive measure is built into the assembly structure, allowing thermal expansion to occur in a controlled manner that prevents quality defects.
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 prevents wrinkles on the reflective plate by eliminating adhesion between the light guide plate and the double-sided tape, maintaining the tape's width, and allowing for conventional processing equipment to be used, thereby reducing manufacturing time and costs.
Implementation Method 1
applying an anti-adhesive film with low surface energy to prevent adhesion between the light guide plate and the double-sided tape
Implementation Method 2
a light guide plate for guiding light from the light source to the liquid crystal display panel
Implementation Method 3
a reflective plate below the light guide plate to reflect the light from the light guide plate
Implementation Method 4
adjusting the amount of light transmitting through a liquid crystal layer according to a refractive index anisotropy of liquid crystal molecules
Data Source
AI summary
A liquid crystal display device is provided which has a minimized bezel by a reduction in the size of a guide panel. The liquid crystal display device can include a liquid crystal display panel; a light source; a light guide plate for guiding light from the light source to the liquid crystal display panel; a reflective plate below the light guide plate to reflect the light from the light guide plate; a guide panel having an upper surface on which the liquid crystal display panel is disposed; a double-sided tape for fixing the reflective plate to the guide panel; a bottom cover for receiving the light guide plate and the guide panel; and a top cover for coupling the bottom cover and the guide panel, wherein a part of the double-sided tape is extended to the light guide plate to be in contact with the light guide plate.