Diffusion Optical Element Unit Structures for Uniform Laser Illumination
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Solution Overview
Problem
Existing projector technologies face challenges in achieving uniform illumination distribution on the spatial light modulation device, leading to inefficiencies in image projection and display quality.
Innovation Solution
A light source device comprising a laser light source, a diffractive optical element, and a diffusion optical element with specifically designed unit structures on the incidence and emission faces to refract and diffuse laser light, ensuring uniform illumination distribution on the predetermined face.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional illumination methods are used, then the structure is simple, but the illumination distribution is non-uniform
Solution Approach 1:
A diffusion optical element is introduced as an intermediary component between the laser light source and the spatial light modulation device. This element mediates the illumination process by diffusing the laser light to achieve uniform illumination distribution, resolving the contradiction between illumination uniformity and system complexity
Solution Approach 2:
The diffusion optical element changes the spatial distribution parameter of the laser light through diffusion. By transforming the concentrated laser beam into diffused light with controlled angular distribution, the illumination uniformity is improved while managing the system complexity
2Illumination intensity
If diffusion optical element with unit structures is used, then the illumination distribution becomes uniform, but the light attenuation increases
Solution Approach 1:
Unit structures are locally arranged on the diffusion optical element surface with varying densities and orientations. This local quality variation enables effective light diffusion for uniform illumination while minimizing overall light attenuation by optimizing the diffusion structure distribution
Solution Approach 2:
The diffusion optical element applies partial diffusion action through selectively arranged unit structures rather than complete surface diffusion. This approach achieves sufficient illumination uniformity while reducing excessive light scattering that would cause attenuation
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
The solution effectively restricts laser light attenuation, achieving high illumination levels and uniform illumination distribution, which enhances image display quality and projector performance.
Implementation Method 1
a diffractive optical element that is located between the laser light source and the predetermined face, and that diffracts the laser light
Implementation Method 2
a diffusion optical element that is located between the laser light source and the predetermined face, and that has an incidence face into which the laser light is incident and a light emission face from which the laser light from the incidence face is emitted, and that diffuses the laser light by refracting the laser light at the incidence face
Implementation Method 3
unit structures that are two-dimensionally arrayed on at least one of the incidence face and the light emission face of the diffusion optical element, and that cause the light which is perpendicularly incident into the diffusion optical element to refract at one time, and then emit this light toward the predetermined face
Data Source
AI summary
A light source device generates irradiation light that is irradiated onto a predetermined face, the light source device including: a laser light source that emits laser light; a diffractive optical element that diffracts the laser light; a diffusion optical element that has an incidence face into which the laser light is incident and a light emission face from which the laser light from the incidence face is emitted, and that diffuses the laser light; and unit structures that are two-dimensionally arrayed on at least one of the incidence face and the light emission face of the diffusion optical element, and that cause the light which is perpendicularly incident into the diffusion optical element to refract at one time, and then emit this light toward the predetermined face.