LCD Backlight Frame Structure for Narrow-Bezel Alignment
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Solution Overview
Problem
The dimensions of the mold frame in existing backlight units are approaching the structural limits of injection molding, making it difficult to achieve thinner and narrower frames for liquid crystal display devices.
Innovation Solution
A backlight device is designed with a frame formed from a sheet material, where the width of the frame and the adhesive layer are equal, and their external surfaces are flush, allowing for a uniform thickness and precise alignment of components such as a reflective sheet and optical members, which are attached to the frame using adhesive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If injection molding is used to manufacture the mold frame, then the frame can be produced with integrated structure, but the frame dimensions cannot be reduced below the structural limit of injection molding
Solution Approach 1:
The mold frame is divided into a frame body and a separate adhesive layer. The frame body is manufactured by injection molding, while the adhesive layer is applied separately to the inner surface of the frame body. This segmentation allows the frame width to be reduced below the structural limit of injection molding while maintaining manufacturing feasibility.
Solution Approach 2:
The adhesive layer is designed with a width equal to the frame body width, creating a flush external surface. This dimensional design allows the adhesive layer to extend to the outer surface of the frame, enabling further reduction of the overall frame width while maintaining structural integrity and manufacturing capability.
2Manufacturing precision
If the adhesive layer width is less than the frame width, then the adhesive layer does not cover the entire inner surface, but the external surface becomes non-uniform with projecting adhesive
Solution Approach 1:
The adhesive layer is designed with a width equal to the frame body width, creating a flush external surface. This dimensional design allows the adhesive layer to extend to the outer surface of the frame, enabling further reduction of the overall frame width while maintaining structural integrity and manufacturing capability.
3Length of stationary object
If the frame width is reduced to achieve thinner display devices, then the device thickness is reduced, but the manufacturing precision of the frame and adhesive layer alignment becomes more difficult
Solution Approach 1:
The adhesive layer is applied to the inner surface of the frame body before the lightguide plate is installed. This preliminary action ensures that the adhesive layer is already in position with the correct width and alignment, facilitating the subsequent installation of the lightguide plate and maintaining manufacturing precision even with reduced frame width.
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 enables the production of thinner and narrower backlight devices at lower costs, with improved light-emitting performance by ensuring precise alignment and reducing the thickness of the frame and lightguide plate, while avoiding issues with projecting adhesive layers.
Implementation Method 1
a first adhesive layer provided on one surface of the frame; a reflective sheet attached to the frame with the first adhesive layer
Data Source
AI summary
A display device is provided and includes a liquid crystal display panel; and a backlight device opposed to the liquid crystal display panel; the backlight device including a frame-shaped structure with a first surface and a second surface, the second surface facing the liquid crystal display panel and being located between the liquid crystal display panel and the first surface; a reflective sheet adhering to the first surface with a first adhesive layer; and a light-shielding member covering a side surface of the liquid crystal display panel.