Lateral LED Housing for Homogeneous Planar Illumination
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Solution Overview
Problem
Existing planar illumination devices face challenges in achieving homogeneous light distribution and high efficiency across a large light emission surface while maintaining a small constructional depth, with issues related to light source placement and reflection losses.
Innovation Solution
A luminous body design featuring a housing with laterally emitting light sources, where inner walls reflect light to achieve parallel radiation, eliminating the need for an optical waveguide plate and allowing for greater spacing between light sources, resulting in reduced constructional depth and lower reflection losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an optical waveguide plate with cavities is used to achieve homogeneous light distribution, then illumination homogeneity is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the optical waveguide plate from the system entirely. Instead of using a complex waveguide structure with cavities, the invention directly positions light sources against the light emission surface, eliminating the need for light guidance through the waveguide and simplifying the overall device structure while maintaining illumination homogeneity through proper light source arrangement and spacing.
2Illumination intensity
If light sources are placed closer together to achieve homogeneous distribution over large surfaces, then illumination homogeneity is improved, but constructional depth increases
Solution Approach 1:
The patent transitions from a vertical stacking approach (increasing constructional depth) to a lateral distribution approach. By arranging light sources in a planar configuration directly on the light emission surface and utilizing lateral spacing rather than vertical layering, the invention achieves homogeneous illumination over large surfaces while maintaining a compact constructional depth.
3Illumination intensity
If more light sources are used to achieve high luminance over large areas, then luminance is improved, but manufacturing cost increases
Solution Approach 1:
The patent optimizes the spacing and arrangement parameters of the light sources to achieve the most efficient luminance distribution. By carefully selecting the distance between adjacent light sources and their positions on the emission surface, the invention maximizes luminance output while minimizing the total number of light sources required, thereby reducing manufacturing costs while maintaining high luminance levels across large areas.
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 achieves high homogeneity and efficiency in light distribution, enabling a smaller number of light sources for the same homogeneity, reduced costs, and scalable luminous surfaces with adjustable color and brightness, while maintaining high luminance values suitable for various applications.
Implementation Method 1
inner walls of the housing reflect the light at least partly
Data Source
AI summary
A luminous body is described, in particular in the form of a planar illumination device for general lighting or for backlighting of displays, wherein the luminous body comprises a plurality of light sources arranged in a housing (1) such as, for example, LED elements (3, 5). The luminous body is remarkable in that the light of the light sources is radiated at least substantially in a direction parallel to a light emission surface (6) of the housing (1), while the inner walls of the housing (1) reflect the light at least partly. Not only does this render it possible to achieve a very homogeneous light distribution on the light emission surface (6) also in the case of a small constructional height of the luminous body, but the fact that no optical waveguide plate is required in the housing (1) also provides advantages in the form of a simple manufacture and low cost.