Lens Fixing Structure for Display Backlight Units
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Solution Overview
Problem
Existing display devices face issues with the reliability and durability of the fixing structure for lenses in backlight units, particularly due to adhesive detachment caused by external impacts or heat generated by light sources.
Innovation Solution
A display device design featuring a lens with protruding stoppers and legs that fit into a substrate with corresponding holes and adhesive application, forming a secure fixing structure that maintains stability even if the adhesive strength is reduced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive is used to fix the lens to the substrate, then the lens can be easily mounted, but the adhesive detachment occurs due to external impact or heat
Solution Approach 1:
The fixing structure is segmented into multiple components: the substrate with holes, the lens with protrusions, and adhesive applied in specific locations. This segmentation allows each component to perform its function optimally while working together to provide both ease of assembly and durable fixation.
Solution Approach 2:
The invention merges multiple fixing mechanisms into a unified structure: mechanical interlocking through protrusions and holes, chemical bonding through adhesive, and structural support through the integrated lens-substrate assembly. This combination ensures both easy mounting and high reliability.
2Ease of repair
If the adhesive strength is reduced to allow lens detachment, then the lens can be removed for maintenance, but the lens may detach due to heat from the light source
Solution Approach 1:
The adhesive is applied locally at specific positions rather than uniformly across the entire lens-substrate interface. This localized application allows controlled bonding strength where needed while maintaining ease of removal where not required, balancing repairability with operational reliability.
3Reliability
If a complex fixing structure is used to improve durability, then the lens remains securely attached, but the manufacturing complexity increases
Solution Approach 1:
The protrusions on the lens serve multiple functions: they provide mechanical interlocking with the substrate holes, act as positioning elements during assembly, and serve as support structures for adhesive application. This multi-functionality reduces the need for separate components, simplifying the overall structure while maintaining high durability.
Data Source
AI summary
A display device is disclosed. The display device includes a display panel, a frame positioned in the rear of the display panel, a substrate positioned between the frame and the display panel, extended in an up-down direction of the frame, and mounted on the frame, a light source mounted on the substrate, and a lens covering the light source and mounted on the substrate. The lens includes a first stopper protruding and extending from a lower surface of the lens, and a first leg extended from the first stopper toward a lower part of the lens. The substrate includes a hole into which the first leg is inserted.