Backlight Optical Plate Rising Area Light Distribution
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Solution Overview
Problem
Conventional backlight modules with light guiding boards suffer from low emitting efficiency, typically providing less than 70% efficiency for medium-sized side-edged modules and even lower for monitors, and exhibit uneven illumination due to the lack of a guiding medium for light projection.
Innovation Solution
A radiation structure without a light guiding board, featuring an optical plate with rising areas, strategically positioned light sources with half-intensity angles below 15 degrees, a diffusion plate with an inverse prism layer, and irregular or V-shaped notches on the rising surface to enhance even light scattering and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a light guiding board is used to guide light from the light source, then the light can be directed through the backlight module, but the emitting efficiency is reduced due to energy consumption in the light guiding board
Solution Approach 1:
The patent removes the light guiding board from the backlight module structure entirely. The light sources are directly mounted on the optical reflector, eliminating the light guiding board's energy consumption and improving emitting efficiency while simplifying the overall structure.
Solution Approach 2:
The patent combines the light source mounting function and light reflection function into a single integrated structure. The optical reflector serves both as the mounting base for light sources and as the reflective surface, eliminating the need for separate light guiding components.
2Device complexity
If no optical element is used to guide light projection, then the structure is simplified, but uneven illumination occurs with brighter sides and darker middle section
Solution Approach 1:
The patent applies different surface characteristics to different regions of the optical reflector. The middle portion has a raised profile with specific reflective properties, while the side portions have different geometries, creating locally optimized light distribution that achieves overall uniform illumination without complex optical elements.
Solution Approach 2:
The patent uses a raised middle portion with curved surfaces on the optical reflector to redirect light paths. The curvature of the raised portion helps distribute light more evenly across the diffusion plate, preventing the dark middle section problem while maintaining structural simplicity.
3Illumination intensity
If the radiant half-intensity angle of light sources is large, then light distribution is broader, but the directivity and concentration of light projection onto the optical plate is reduced
Solution Approach 1:
The patent addresses light distribution by transitioning from a two-dimensional planar reflector to a three-dimensional raised middle portion structure. This vertical dimension allows the concentrated light from narrow-angle sources to be redirected and distributed across the diffusion plate area, achieving both concentration and coverage.
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 reduces thickness and weight while achieving consistent illumination by directing light sources to the optical plate, promoting extensive scattering and enhancing radiance, thereby overcoming the inefficiencies and unevenness of conventional designs.
Implementation Method 1
two light sources connected to two sides of the optical plate; radiant half-intensity angles of the two light sources being defined below 15 degrees for respectively forming optical axial directions
Implementation Method 2
a diffusion plate being disposed above a protruding direction of the rising area of the optical plate
Implementation Method 3
the streams of light emitted from an emission plane of the light guiding board would be adequately mixed in the mixing cavity
Implementation Method 4
The inverse layer has a serrate cross section
Implementation Method 5
the optical reflector reflect or scatter an uneven luminosity
Data Source
AI summary
A radiation structure without a light guiding board for a backlight module or an illuminant device includes an optical plate formed with at least one rising area having a rising surface defined at the center thereof, two light sources disposed adjacent to two sides of the optical plate, and a diffusion plate. The light sources each possess a radiant half-intensity angle below 15 degrees for respectively forming optic axial directions thereof, allowing a radiation field to be diffusively formed from the pivoting of the optic axial directions. Whereby, the optic axial directions respectively face toward the rising surface, allowing the projection of the radiation field on the rising surface, and the diffusion plate is disposed above the rising area of the optical plate. Therefore, an even radiating surface caused by a diffusion of the light sources from the diffusion plate could be preferably obtained even if no light guiding board is applied.