LCD Backlight Frame Structure for Thinner, Narrower Designs
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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 with a frame formed of a sheet material, where the width of the frame and the first adhesive layer are equal, and their external surfaces are flush, allowing for a uniform thickness and precise alignment of a reflective sheet and optical members, enabling thinner and narrower designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If injection molding is used to manufacture the mold frame, then the frame can be produced with integrated structure, but the frame dimensions approach the structural limit and cannot be made thinner or narrower
Solution Approach 1:
The frame is divided into a frame body and a separate adhesive layer. The frame body is formed by injection molding, while the adhesive layer is applied separately to the outer surface. This segmentation allows the frame body to be optimized for structural integrity while the adhesive layer provides the necessary bonding function, enabling thinner overall frame dimensions without compromising manufacturability.
Solution Approach 2:
The adhesive layer is positioned on the outer surface of the frame body, utilizing the dimensional space outside the frame structure. This allows the adhesive function to be added without increasing the frame body thickness, effectively reducing the overall frame dimension while maintaining manufacturing feasibility.
2Reliability
If the adhesive layer width is greater than the frame width, then the adhesive can fully cover the frame for bonding, but the projecting adhesive interferes with other structures and increases device thickness
Solution Approach 1:
The adhesive layer width is designed to match the frame width at specific locations, creating a flush profile where the adhesive does not project beyond the frame. This local optimization ensures adequate bonding coverage while maintaining a clean frame profile that does not interfere with other structures.
Solution Approach 2:
The adhesive layer is applied to cover the necessary bonding area of the frame without extending beyond the frame boundaries. This partial coverage approach provides sufficient bonding reliability for the reflective sheet and optical members while avoiding the harmful effects of excessive adhesive projection.
3Length of moving object
If the frame width is reduced to achieve narrower display devices, then the device becomes thinner and narrower, but the adhesive layer becomes difficult to align precisely with the frame edges
Solution Approach 1:
The adhesive layer is designed with a width that corresponds to the frame width, and the reflective sheet and optical members are positioned on the adhesive layer before final assembly. This preliminary positioning ensures that the adhesive is already aligned with the frame edges, eliminating alignment issues even when the frame width is reduced for narrower device designs.
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 allows for the production of thinner and narrower backlight devices at lower costs, with improved light-emitting performance by avoiding projecting adhesive layers that interfere with other structures.
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.