Composite Resin Metal Frame for Narrow Planar Illumination
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Solution Overview
Problem
Conventional planar illumination devices face challenges in balancing frame narrowing, reduction in thickness, and securing necessary rigidity, particularly in liquid crystal display devices, where further frame narrowing is demanded to downsize and improve design while maintaining structural integrity.
Innovation Solution
A planar illumination device is designed with a frame composed of both resin and metal frame members, featuring joint portions at their ends, allowing for efficient light emission and stable component holding. The resin frame members are used where narrowing is not critical, and metal frame members are used where narrowing is essential, with complementary shapes at the joint portions for secure integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the frame is made thinner to narrow the frame width, then the frame narrowing is achieved, but the rigidity and structural integrity deteriorate
Solution Approach 1:
The frame is constructed by combining resin and metal materials in a composite structure. The resin portion provides insulation and covers the metal frame, while the metal frame provides structural strength and rigidity. This composite approach allows the frame to be made thinner while maintaining sufficient structural integrity through the high strength-to-weight ratio of the metal component.
Solution Approach 2:
The frame is divided into distinct resin and metal portions that are joined together. The metal frame members are positioned at critical locations for structural support, while resin portions are used for insulation and covering. This segmentation allows each material to be optimized for its specific function, enabling frame narrowing while maintaining rigidity.
2Ease of manufacture
If resin frame members are used to reduce weight and simplify manufacturing, then ease of manufacture is improved, but the frame rigidity and strength deteriorate
Solution Approach 1:
The invention uses a composite frame structure where resin and metal portions are combined. The resin portions can be easily manufactured using injection molding or other plastic forming techniques, while metal portions provide the necessary strength and rigidity. This composite approach maintains ease of manufacture while compensating for the lower strength of resin alone.
Solution Approach 2:
Different materials are used in different locations of the frame based on functional requirements. Metal frame members are positioned where high strength and rigidity are needed for structural support, while resin portions are used where insulation, weight reduction, or ease of manufacturing are priorities. This local differentiation optimizes both manufacturability and structural performance.
3Strength
If metal frame members are used to ensure rigidity and strength, then frame strength is improved, but the frame width and thickness increase
Solution Approach 1:
The composite frame structure allows thin metal frame members to provide sufficient strength and rigidity. The metal portions can be made thinner than traditional solid metal frames because they are strategically positioned and joined to resin portions that provide additional structural support and distribute loads. This reduces the overall frame thickness while maintaining strength.
Solution Approach 2:
The frame is segmented into metal and resin portions that work together to provide structural support. The metal frame members are positioned at critical locations for maximum structural efficiency, allowing them to be thinner while still providing the necessary strength. The resin portions fill in other areas, providing insulation and additional support without requiring the same thickness as solid metal would need.
4Volume of moving object
If the frame is narrowed to downsize the display device, then the device size is reduced, but the adhesive area for fixing components deteriorates
Solution Approach 1:
The composite frame structure with resin portions provides sufficient surface area for adhesive fixation. The resin portions can be designed with adequate width and surface area to accommodate adhesive bonding of components like the light guiding plate and optical sheets, even when the overall frame is narrowed. The metal portions provide structural strength while the resin portions provide the adhesive bonding surface.
Data Source
AI summary
A planar illumination device according to an embodiment, including: a light guiding plate having one of a pair of opposite principal surfaces serving as a light emission surface; a light source arranged at a side surface connecting end edges of the pair of principal surfaces of the light guiding plate; and a frame, in which the light guiding plate is arranged. The frame is formed of plural frame members arranged along side surfaces of the light guiding plate. The plural frame members are configured to include a resin frame member and a metal frame member, and to have a joint portion between the resin frame member and the metal frame member, the joint portion arranged at end portions of the resin frame member and the metal frame member.