Optical Film Thermal Expansion Structure for LCD Edge Warping
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Solution Overview
Problem
The edges of optical films in liquid crystal display backlight modules warp due to inhomogeneous heating, leading to side incidence light and poor display effects in larger displays like TVs.
Innovation Solution
Incorporating a thermal expansion stretchable structure, such as through holes or notches, into the optical film near heat sources to manage thermal expansion and maintain flatness, potentially combined with thermally conductive depression bars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the optical film size is increased to meet larger display requirements, then the display area is improved, but the optical film edge warping due to thermal expansion worsens
Solution Approach 1:
The optical film is segmented by introducing through holes or notches that divide the continuous film structure into regions separated by these features. This segmentation allows different parts of the film to expand independently under thermal stress, preventing cumulative warping across the entire film edge while maintaining overall coverage area.
Solution Approach 2:
The thermal expansion stretchable structure is applied locally at the optical film edge closest to the heat source, rather than uniformly across the entire film. This localized approach addresses the specific warping problem at the heated edge while preserving the flatness and optical quality of the rest of the film surface.
2Shape
If thermal expansion stretchable structures are added to prevent edge warping, then edge flatness is improved, but device complexity increases
Solution Approach 1:
The optical film incorporates a porous or perforated structure through through holes or notches, which serves dual purposes: it provides thermal expansion accommodation to prevent edge warping while maintaining the film's optical transmission properties. The porous structure allows the film to breathe and expand without creating complex mechanical compensation systems.
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
Prevents warping of the optical film edges near heat sources, enhancing display quality by allowing controlled thermal expansion and maintaining flatness, thus improving the display effect.
Implementation Method 1
the optical film will expand because of heating at an edge close to the heat source... the thermal expansion stretchable structure is capable of releasing a thermal expansion amount of the optical film body
Implementation Method 2
the thermal expansion stretchable structure may further comprise a thermally conductive depression bar press fitted on the thermal expansion stretchable structure
Data Source
AI summary
The present disclosure discloses an optical film, a backlight module and a liquid crystal display device and relates to the liquid crystal display field. It solves the problem that the edge of an optical film in the prior art can be easily warped. An optical film is provided and comprises an optical film body, and at a position of the optical film body that is close to a heat source, a thermal expansion stretchable structure is provided and is capable of releasing a thermal expansion amount of the optical film body.