Backlight Module Inclined Lighting Curtain Edge Illumination
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Solution Overview
Problem
In display devices with inclined casing edges, direct-type backlight modules result in non-uniform illumination, particularly at the edges, leading to reduced usable display area due to darker illumination.
Innovation Solution
A backlight module design featuring a housing with an inclined side wall, a lighting curtain with a central and edge portion at an angle greater than 90 degrees, and a diffusion plate, where the light source is positioned under the central portion, and the edge portion is connected to the side wall, enhancing light reflection and emission from the edge of the diffusion plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a direct-type backlight module is used with an inclined side wall, then the device achieves a thin profile, but the illumination at the edge of the diffusion plate becomes non-uniform and darker
Solution Approach 1:
The lighting curtain is divided into a central portion and an edge portion that are spatially separated and independently positioned. The edge portion is specifically configured to address the illumination deficiency at the edges of the diffusion plate, while the central portion serves the main illumination area. This segmentation allows targeted optimization of light distribution without compromising the thin profile design.
Solution Approach 2:
The edge portion of the lighting curtain is positioned closer to the side wall than the central portion, creating a non-uniform spatial distribution tailored to the specific illumination needs of different regions. This local quality adjustment ensures that the edge areas receive sufficient light intensity to match the central areas, achieving overall uniformity while maintaining the inclined side wall structure.
2Length of stationary object
If the edge of the casing includes an inclined surface, then the display device achieves a thinner profile, but the usable display area decreases due to darker edge illumination
Solution Approach 1:
The lighting curtain is positioned in advance to preemptively address the illumination deficiency before it affects the display quality. By pre-configuring the edge portion to be closer to the side wall, the system proactively compensates for the light loss that would otherwise occur at the edges, ensuring that the entire diffusion plate including edges achieves uniform illumination suitable for display use.
3Illumination intensity
If the lighting curtain is positioned closer to the side wall at the edge, then edge illumination is improved, but the structural complexity increases
Solution Approach 1:
The position of the lighting curtain is varied as a continuous parameter across different spatial locations rather than maintaining a uniform distance. The edge portion is positioned at a first distance from the side wall while the central portion is positioned at a second distance, creating a gradient distribution that optimizes illumination without requiring complex mechanical adjustment mechanisms. This parameter change approach simplifies the overall structure while achieving the desired illumination uniformity.
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 ensures uniform illumination of the diffusion plate edge, increasing the usable display area by reflecting light beams onto the inclined side wall and emitting them from the edge of the diffusion plate, thus addressing the issue of non-uniformity and edge darkness.
Implementation Method 1
The base plate is substantially parallel to the central portion, and the diffusion plate is substantially parallel to the central portion.
Data Source
AI summary
A backlight module includes a housing, a lighting curtain, a light source, and a diffusion plate. The housing includes a base plate and a side wall inclined relative to the base. The lighting curtain is disposed in the housing, and includes a central portion separated from the base plate, and an edge portion inclined relative to the central portion. The edge portion is connected to the side wall. The light source is disposed on the base plate, and located under the central portion. The diffusion plate is located on the lighting curtain, and separated from the central portion. The edge of the diffusion plate is connected to the side wall.