Liquid Crystal Display Container Case Gap Design for Thermal Expansion
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Solution Overview
Problem
The reduction of the frame area in liquid crystal display devices for mobile devices poses challenges in securing sufficient adhesion and durability, especially when the backlight unit is made thinner, leading to difficulties in assembly and potential display quality issues due to thermal expansion and contraction of components.
Innovation Solution
A liquid crystal display device design featuring a container case with a gap between the sidewalls and the backlight unit's components, allowing for relative displacement and compensation of thermal expansion, eliminating the need for a conventional resin frame and enhancing durability and adhesion by using a plate metal container case fixed to a cover panel with a double-sided tape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the frame area is reduced to enlarge the display area, then the display area is enlarged, but the adhesion area for the double-sided tape is reduced making sufficient adhesion difficult
Solution Approach 1:
The invention divides the adhesion function into two separate locations: the double-sided tape adheres the resin frame to the liquid crystal display panel in the frame area, while the adhesive agent adheres the backlight unit to the resin frame in the display area. This segmentation allows the frame area to be minimized while still providing sufficient total adhesion area through the display area.
Solution Approach 2:
The invention transitions from a single-plane adhesion approach (only in the frame area) to a multi-dimensional approach by utilizing both the frame area and the display area for adhesion. The adhesive agent is applied in the display area between the backlight unit and resin frame, effectively adding another dimension to the adhesion strategy.
2Length of moving object
If the resin frame is made thinner to reduce backlight unit thickness, then the backlight unit thickness is reduced, but the durability of the resin frame decreases and assembly becomes difficult
Solution Approach 1:
The invention applies different material properties to different parts of the structure: the resin frame is made thin for overall thickness reduction, but the critical adhesion regions use adhesive agents with high bonding strength to compensate for the reduced frame thickness, thereby maintaining durability despite the thinner frame.
Solution Approach 2:
The invention creates a composite structure combining the resin frame with adhesive agents (double-sided tape and additional adhesive agent). This composite approach allows the thin resin frame to achieve the required mechanical strength and durability through the reinforcing effect of the adhesive materials at critical locations.
3Area of moving object
If the frame area is reduced, then the display area is enlarged, but the area for double-sided tape is reduced making assembly difficult
Solution Approach 1:
The invention segments the adhesion function across two different areas and uses two different adhesion methods: double-sided tape for the frame area and adhesive agent for the display area. This segmentation provides assembly flexibility, allowing each adhesion method to be optimized for its specific location and applied independently.
Solution Approach 2:
The invention introduces an adhesive agent as an intermediary between the backlight unit and resin frame in the display area. This intermediary material facilitates assembly by providing a reliable bonding interface even when the frame area is minimized, ensuring proper positioning and attachment.
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 design achieves a reduced frame area with secure fixation and improved durability, maintaining display quality across varying thermal conditions without the need for a specific resin frame, and facilitates easier assembly of the backlight unit.
Implementation Method 1
The resin frame is fixed to the liquid crystal display panel by a double-sided tape or an adhesive agent
Implementation Method 2
allowing for relative displacement and compensation of thermal expansion
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes a liquid crystal display panel, a cover panel, a container case fixed to the cover panel and covering the liquid crystal display panel, and a backlight unit disposed in the container case and opposed to the liquid crystal display panel. The container case includes a bottom wall, and a sidewall directly opposed to at least one edge of the backlight unit with a gap interposed therebetween. At least one of a reflective sheet, light guide plate, and optical sheet of the backlight unit is opposed to the sidewall of the container case with the gap interposed therebetween, and is contained in the container case in a relatively displaceable manner with respect to the container case and the liquid crystal display panel.