Backlight Module Optical Film Refractive Parts Bright Line Elimination
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Solution Overview
Problem
Conventional backlight modules for liquid crystal display devices suffer from the formation of bright lines in the edge area due to light rays being reflected by the outer frame, which affects image quality.
Innovation Solution
Incorporating an optical film with refractive parts featuring microstructures and a substrate on its end surface, which deflects light rays into different directions, and a frame with varying surface roughness and reflectivity to prevent light concentration at specific positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If light rays are reflected by the outer frame, then the light path is extended, but bright lines are formed in the edge area affecting image quality
Solution Approach 1:
The patent applies local quality by differentiating the surface properties of the optical film at different locations. The end surface of the optical film is equipped with a refractive part having microstructures, while other surfaces maintain different properties. This localized modification causes light rays hitting the end surface to be scattered in multiple directions rather than forming concentrated bright lines, thus resolving the contradiction between extending light path and preventing bright line formation.
Solution Approach 2:
The refractive part with microstructures acts as an intermediary element between the optical film and the reflected light rays. This intermediate structure modifies the light path by scattering rays that would otherwise form bright lines, allowing the system to maintain extended light paths while eliminating the harmful bright line effect.
2Ease of manufacture
If the optical film has uniform surface properties, then manufacturing is simplified, but light rays concentrate at specific positions forming bright lines
Solution Approach 1:
Instead of maintaining uniform surface properties throughout the optical film, the patent introduces local quality variation by adding refractive parts with microstructures specifically at the end surface. This localized differentiation prevents light concentration and bright line formation while minimizing impact on manufacturing complexity, as the modification is confined to a specific region rather than requiring non-uniform properties across the entire film.
3Use of energy by moving object
If the frame has high reflectivity, then light is efficiently redirected, but light rays are concentrated at specific positions
Solution Approach 1:
The patent changes the optical parameters of the frame by introducing a rough surface treatment on the inner surface of the lateral wall. This parameter modification transforms the frame from a specular reflector that concentrates light into a diffuse reflector that scatters light in multiple directions, thereby maintaining efficient light redirection while eliminating light concentration and bright line formation.
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 effectively disperses light rays, eliminating bright lines and enhancing image quality by increasing the number of light ray deflections, thus improving the display device's performance and allowing for narrower borders without plastic frames.
Implementation Method 1
The refractive part includes a plurality of microstructures and a substrate. The substrate is adhered to the end surface, and the microstructures are distributed in the substrate.
Implementation Method 2
An inner surface of the lateral wall includes a first area and a second area. The first area is corresponding to the optical film. The second area is corresponding to the optical plate. A surface roughness of the first area is greater than a surface roughness of the second area.
Data Source
AI summary
A backlight module includes an optical plate, a light source, and at least one optical film. The optical plate includes a light-emitting surface, a bottom surface and a side surface. The light source faces to the bottom surface or the side surface. The optical film is disposed above the light-emitting surface and includes a main body and at least one refractive part disposed on an end surface of the main body. The refractive part includes a plurality of microstructures and a substrate. The substrate is adhered to the end surface, and the microstructures are distributed in the substrate.