Backlight Module Optical Film Positioning via Elastic Frame
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Solution Overview
Problem
Existing liquid crystal display devices face issues with the secure positioning and thermal expansion compensation of optical films in backlight modules, leading to potential cracking of waveguides and compromised optical performance.
Innovation Solution
A backlight module design featuring a waveguide, an optical film securely attached to an elastic frame with dowel pins made of stronger materials like stainless steel or aluminum, which are rooted in alignment holes and have slots to absorb thermal expansion, ensuring stable positioning and alignment of the optical film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the optical film is positioned onto the dowel pin of the waveguide, then the optical film can be positioned, but the optical film readily gets loose and may crack the waveguide due to thermal expansion
Solution Approach 1:
An elastic frame is introduced as an intermediary component between the waveguide and the optical film. The elastic frame provides a stable mounting structure with dowel pins that securely hold the optical film, preventing it from loosening or cracking the waveguide during thermal expansion. The frame acts as a mediator that absorbs dimensional changes while maintaining precise optical film positioning.
Solution Approach 2:
The patent utilizes thermal expansion parameter changes by designing the elastic frame to accommodate dimensional changes during heating. The frame's elastic properties allow it to expand and contract with temperature variations, maintaining constant positioning pressure on the optical film without transmitting excessive stress to the waveguide, thus preventing cracks while preserving positioning accuracy.
2Ease of manufacture
If a rubber frame with rubber dowel pins is used to attach the optical film, then the optical film can be deployed, but the rubber dowel pins are readily cut off by the hard optical film
Solution Approach 1:
The patent employs composite material construction where the elastic frame is made of rubber or elastic material while the dowel pins are made of metal (stainless steel, aluminum, copper, or iron). This composite approach combines the advantages of both materials: the elastic frame provides flexibility and ease of assembly, while the metal dowel pins provide the necessary strength and rigidity to resist being cut by the hard optical film during deployment and operation.
3Device complexity
If the dowel pins are made from rubber to match the elastic frame, then the assembly is simple, but the dowel pins cannot provide sufficient support when the optical film moves transversally
Solution Approach 1:
The patent resolves this contradiction by using composite materials where metal dowel pins are integrated into the rubber elastic frame. The metal pins provide the necessary strength and rigidity to support the optical film against transverse movements and prevent positioning loss, while the rubber frame maintains structural simplicity and ease of assembly. This composite structure combines the strength of metal with the simplicity of rubber molding.
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 solution ensures reliable and stable positioning of optical films, preventing damage to the waveguide and maintaining optical quality by using dowel pins that are stronger than the elastic frame and slots to manage thermal expansion, thus enhancing the overall performance of the backlight module.
Implementation Method 1
an elastic frame (12), and at least a dowel pin (14)... the elastic frame is defined with alignment holes in which the dowel pins are interferentially rooted
Implementation Method 2
when the optical film is undergone a thermal expansion, the optical film will jump out of the dowel pin suddenly and create an instant impart
Data Source
AI summary
The present invention provides a backlight module which comprises a waveguide, an optical film, an elastic frame, and dowel pins. Wherein at least corners of the optical film is securely attached to the elastic frame, and wherein the dowel pints are attached to the elastic frame, and the optical film is disposed on top of the waveguide. Wherein corners of the optical film are provided with openings with which the optical films are readily positioned with respect to the waveguide by extending the dowel pins through the openings. And wherein the strength of the dowel pins is stronger than the strength of the elastic frame. The present invention further provides a liquid crystal display device incorporated with the backlight module disclosed above. By this arrangement, once the positioning of the optical films can he ensured, the optical quality of the backlight module can also be ensured.