Anisotropic Diffuser Homogenizing Module for Laser Projection
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Solution Overview
Problem
Conventional projection apparatuses using laser diodes as light sources face issues with uneven light distribution due to mismatched beam angles and acceptance angles in homogenizing modules, leading to color separation and efficiency loss.
Innovation Solution
A homogenizing module comprising an anisotropic diffuser and a homogenizer with optical elements of varying sizes in different directions, allowing for matching of beam divergence angles with acceptance angles, thereby ensuring uniform light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the beam angle is matched with the acceptance angle of the lens element in the short axis direction, then the beam can be properly directed through the lens element, but the light distribution becomes uneven in the long axis direction, resulting in color separation
Solution Approach 1:
The patent applies asymmetry by using an anisotropic diffuser that creates different divergence angles in different directions (first direction and second direction). This asymmetric beam shaping allows the beam to match the different acceptance angles of the lens element in the long axis and short axis directions, thereby achieving uniform light distribution while maintaining proper beam direction control
Solution Approach 2:
The anisotropic diffuser provides different optical properties in different directions, creating local quality variations that match the directional acceptance characteristics of the lens element. This ensures that the beam has appropriate divergence characteristics specifically tailored for each dimension's acceptance angle requirements
2Illumination intensity
If the aperture value (F/#) of the projection lens is reduced to improve brightness, then the light gathering ability is enhanced, but color separation becomes more pronounced due to angular distribution issues
Solution Approach 1:
The anisotropic diffuser creates asymmetric beam divergence that matches the lens's acceptance characteristics, ensuring that even with a reduced aperture value, the angular distribution of light remains optimized. This prevents color separation while maintaining the enhanced brightness from the lower F/# setting
Solution Approach 2:
The patent changes the angular parameters of the beam through the anisotropic diffuser, creating specific divergence angles that are optimized for the projection lens's aperture characteristics. This parameter optimization ensures uniform color distribution is maintained even when using a larger aperture for increased brightness
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 prevents uneven color distribution and enhances image quality by ensuring the beam is evenly distributed across the homogenizer, reducing stray light and improving efficiency.
Implementation Method 1
The anisotropic diffuser is located on a transmission path of the beam. The beam has a first divergence angle in a first direction and a second divergence angle in a second direction after passing through the anisotropic diffuser
Implementation Method 2
The homogenizer is located on a transmission path of the beam from the anisotropic diffuser, and the homogenizer includes multiple optical elements
Data Source
AI summary
A homogenizing module and a projection apparatus are provided. The homogenizing module is configured to homogenize a beam and includes an anisotropic diffuser and a homogenizer. The anisotropic diffuser is located on a transmission path of the beam. The beam has a first divergence angle in a first direction and a second divergence angle in a second direction after passing through the anisotropic diffuser. The first divergence angle is greater than the second divergence angle. The homogenizer is located on a transmission path of the beam from the anisotropic diffuser, and the homogenizer includes multiple optical elements. The size of any of the multiple optical elements in the first direction is greater than the size thereof in the second direction. The first direction is perpendicular to the second direction.