Elastic Frame Backlight Unit Assembly
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Solution Overview
Problem
Existing backlight unit constructions face issues of high cost, weight, assembly complexity, and non-uniform brightness due to the use of metal frames and double stick tape, which result in unstable and low-luminance displays.
Innovation Solution
An elastic frame integrally formed around the light guide plate, with clip portions and a light source container, allows for easy assembly and eliminates the need for a metal cover and double stick tape, ensuring uniform light distribution and reducing assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid plastic frame and back cover are used to hold the light guide plate, then the light guide plate is securely held, but the cost and weight increase
Solution Approach 1:
The patent applies this principle by using a flexible frame made of elastic plastic material that can elastically deform during assembly to snap-fit the light guide plate, replacing rigid metal or hard plastic frames. This reduces weight while maintaining secure holding through elastic retention forces.
2Reliability
If a rigid plastic frame and back cover are used to hold the light guide plate, then the light guide plate is securely held, but the assembly time increases
Solution Approach 1:
The patent applies this principle by designing a frame with elastic flexibility that allows dynamic deformation during assembly. The frame can be temporarily deformed to insert the light guide plate and then automatically returns to its original shape to secure it, enabling quick snap-fit assembly without complex fastening operations.
3Ease of manufacture
If double stick tape is used to attach the light guide plate to the frame, then the light guide plate is held in place, but uniformity of brightness deteriorates due to light absorption
Solution Approach 1:
The patent applies this principle by completely removing the double stick tape from the assembly. Instead of attaching the light guide plate with adhesive tape that absorbs light, the invention uses a mechanical snap-fit structure where the elastic frame holds the light guide plate through elastic deformation, eliminating the harmful light-absorbing tape while maintaining easy assembly.
4Reliability
If metal internal frames are used to hold the light guide plate, then the light guide plate is securely held, but cost and weight increase
Solution Approach 1:
The patent applies this principle by replacing expensive metal frames with a cost-effective elastic plastic frame. The elastic plastic material provides sufficient holding stability through its elastic properties while being significantly cheaper than metal, making it an economical choice for mass production.
Data Source
AI summary
A back light unit includes a light guide plate having a rectangle shape with first and second edges and a light source having a light element to emit light to a first edge of the light guide plate. The light guide plate emits the incident light from the light source to a liquid crystal display panel as a flat light source. An elastic frame is integrally formed with first and second frame elements in a rectangle shape so as to surround the light guide plate. The light source includes a metal frame clipped by a clip shape implemented provided in the first frame element. The first edge facing the second edge of the light guide plate is fitted to the metal frame. The second edge of the light guide plate is fitted to a second frame element having a clip portion for clipping the light guide plate.