Backlight Module Optical Film Deformation Control
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Solution Overview
Problem
The thinning of display devices is limited by the deformation of optical modulation films due to poor heat dissipation, which affects the optical quality, and existing designs struggle to maintain optical performance while reducing thickness.
Innovation Solution
A backlight module design that sandwiches a diffusion member with 65%–85% transmittance between a reflector and an optical modulation film, reducing the air gap and using light sources in light source holes to facilitate thinning, while a diffusion plate and diffusion member prevent deformation of the optical modulation film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the air gap above and below the optical modulation film is reduced to thin the backlight module, then the thickness is reduced, but the optical modulation film becomes prone to deformation such as bending or waving
Solution Approach 1:
The invention introduces a light-guiding structure that divides the optical modulation film into multiple sections, with light sources arranged in light source holes on the reflector. This segmentation provides localized support points that prevent overall film deformation while allowing the structure to be thinner.
Solution Approach 2:
The reflector is designed with light source holes at specific locations where light sources are disposed, creating localized support structures. This local quality enhancement provides targeted support to the optical modulation film at critical points, preventing deformation in thin designs.
2Length of moving object
If the backlight module is thinned by reducing air gap, then the thickness is reduced, but heat dissipation becomes poor causing optical film deformation
Solution Approach 1:
The reflector incorporates light source holes that create a porous structure, allowing heat to dissipate through multiple pathways while maintaining structural support. This porous design improves heat dissipation performance even in a thinned configuration.
Solution Approach 2:
The light source holes segment the reflector structure, creating channels for heat dissipation. This segmentation allows thermal management in thin designs by providing multiple heat escape routes without requiring large air gaps.
3Length of moving object
If light sources are disposed in light source holes of the reflector, then the thinning design is facilitated, but the structural support for optical films may be insufficient
Solution Approach 1:
Light sources are disposed in light source holes at specific locations on the reflector, creating localized support points. This local quality enhancement provides targeted structural support where needed most, maintaining film stability in thin designs.
Solution Approach 2:
The light source holes are pre-formed in the reflector structure, creating predetermined support locations before assembly. This preliminary action ensures that optical modulation film is supported at optimal points, enhancing structural integrity in thinned configurations.
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 design effectively prevents deformation of the optical modulation film, improves optical quality, and allows for further thickness reduction of the backlight module, enhancing brightness uniformity and enabling a slim frame design.
Implementation Method 1
a diffusion member sandwiched between the reflector and the optical modulation film, the diffusion member having a transmittance of 65% ̃85%
Data Source
AI summary
A display device includes a display panel and a backlight module disposed under the display panel. The display panel has a display area and a light-blocking layer disposed around the display area. The backlight module includes a plurality of light sources, a reflector disposed corresponding to the light sources, an optical modulation film disposed above the light sources and the reflector, a diffusion member sandwiched between the reflector and the optical modulation film, and a diffusion plate disposed on one side of the optical modulation film opposite to the diffusion member, wherein the optical modulation film is sandwiched between the diffusion plate and the diffusion member, and the diffusion member has a transmittance of 65%˜85%.