Backlight Module Lenses with Side Diffusing Portions
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Solution Overview
Problem
Existing backlight modules often suffer from non-uniform brightness distribution due to the direct emission of light rays from light-emitting elements, leading to brighter zones between adjacent lenses, which affects the overall quality of display devices.
Innovation Solution
The proposed backlight module incorporates lenses with diffusing portions on their side surfaces, strategically positioned between adjacent light-emitting elements, to diffuse light rays and reduce brightness between lenses, ensuring a more uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-emitting elements emit light directly without diffusion, then the light output intensity is high, but the brightness distribution becomes non-uniform with brighter zones between adjacent lenses
Solution Approach 1:
The patent applies local quality by adding diffusing portions only to specific regions (side surfaces) of the lenses rather than modifying the entire lens structure. This allows the lenses to maintain their basic light-guiding function while introducing diffusion capability in targeted areas to reduce brightness between adjacent lenses, thereby improving brightness uniformity without significantly complicating the overall lens structure
Solution Approach 2:
The lens structure is segmented into different functional regions: the main lens body for light guidance and the diffusing portions for light diffusion. This segmentation allows each part to perform its specific function optimally - the lens body maintains high light output while the diffusing portions control the brightness distribution between lenses, resolving the contradiction between intensity and uniformity
2Illumination intensity
If diffusing portions are added to lens side surfaces, then brightness uniformity improves, but the device structure becomes more complex
Solution Approach 1:
The patent merges the diffusion function directly into the lens structure by integrating diffusing portions onto the lens side surfaces. This eliminates the need for separate diffusion elements or additional components, as the lens itself performs both light guidance and diffusion functions. The merging approach improves brightness uniformity while minimizing the increase in device complexity
Solution Approach 2:
The lens structure is designed to serve multiple functions: the main body guides light from the light-emitting element, while the integrated diffusing portions on the side surfaces control light distribution between adjacent lenses. This multi-functionality allows a single component to address both light output and brightness uniformity requirements, reducing the need for additional separate components
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 configuration effectively reduces brightness between lenses, resulting in a more uniform light distribution across the display panel, enhancing the visual quality by preventing over-bright zones and improving the overall brightness uniformity.
Implementation Method 1
The diffusing portions are located on the side surface. At least one of the diffusing portions of each of the lenses is located between adjacent two of the corresponding lenses. the light rays emitted towards each other from adjacent two of the light-emitting elements through the lenses are first diffused by the diffusing portions
Data Source
AI summary
A backlight module includes a base plate, a plurality of light-emitting elements and a plurality of lenses. The light-emitting elements are disposed on the base plate. The lenses are disposed on the base plate and respectively correspond to the light-emitting elements. Each of the lenses has a side surface and a plurality of diffusing portions. The diffusing portions are located on the side surface. At least one of the diffusing portions of each of the lenses is located between adjacent two of the corresponding lenses.