Diffusion Element with Local Haze Variation for Laser Beam Homogenization
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Solution Overview
Problem
Projectors face the challenge of achieving sufficient light intensity at non-center regions of a laser beam while effectively eliminating the central light spot to prevent energy concentration, which affects light utilization and reliability.
Innovation Solution
A diffusion element with multiple diffusion regions, where the first diffusion region has a higher haze than the second, is used to eliminate the central light spot and provide sufficient light intensity, featuring uniformly distributed diffusion structures on both the light incident and emitting surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diffusion element with high haze is used to eliminate the central light spot, then the central light spot is effectively eliminated and energy concentration is prevented, but the light transmittance is reduced and light intensity at non-center regions becomes insufficient
Solution Approach 1:
The diffusion element is divided into a first diffusion region with higher haze for eliminating the central light spot and a second diffusion region with lower haze for maintaining light intensity at non-center regions. This local differentiation allows each region to perform its specific function optimally without compromising the other.
Solution Approach 2:
The diffusion element is segmented into multiple diffusion regions with different haze values. The first diffusion region (higher haze) and second diffusion region (lower haze) are spatially separated to handle different functional requirements: central spot elimination versus light transmission maintenance.
2Object-affected harmful factors
If the haze of the diffusion element is increased to eliminate the central light spot, then the central light spot is removed, but the light transmittance is reduced affecting light utilization
Solution Approach 1:
Different regions of the diffusion element have different haze properties tailored to their specific functions. The first diffusion region has higher haze to eliminate the harmful central light spot, while the second diffusion region has lower haze to maintain high light transmittance and utilization at non-center regions.
3Object-affected harmful factors
If a single diffusion region with high haze is used, then the central light spot is eliminated, but the light uniformity across the beam cannot be optimized
Solution Approach 1:
The diffusion element employs different haze values in different regions to achieve both central spot elimination and overall light uniformity. The first diffusion region addresses the central spot issue while the second diffusion region contributes to uniform light distribution across the non-center areas.
Solution Approach 2:
By segmenting the diffusion element into multiple regions with different optical properties, the patent achieves both goals: the first diffusion region eliminates the central light spot while the second diffusion region maintains light uniformity across the beam profile.
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 ensures favorable light uniformity, reliability, and light utilization in projectors by effectively diffusing the central light spot and maintaining sufficient intensity at non-center regions, while also reducing manufacturing costs.
Implementation Method 1
the main purpose of atomizing a laser beam emitted by a laser light source by a diffusion element in the projector is to eliminate a central light spot of the laser beam and prevent energy of the laser beam from being excessively concentrated
Data Source
AI summary
A projector including an illumination system, a light valve and a projection lens is provided. The illumination system is configured to provide an illumination beam, and includes a light source and a diffusion element. The light source is configured to provide an exciting beam. The diffusion element is located on a transmission path of the exciting beam, and configured to receive the exciting beam for outputting at least part of the illumination beam. The diffusion element includes at least one first diffusion region and at least one second diffusion region surrounding the first diffusion region. A haze of the first diffusion region is greater than a haze of the second diffusion region. The light valve is located on a transmission path of the illumination beam, and configured to convert the illumination beam into an image beam. The projection lens is located on a transmission path of the image beam.