Homogenizing Element with Dichroic Layer for Laser Projector Beam Control
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Solution Overview
Problem
Existing homogenizing elements in laser projectors cannot adjust beam angles of different color beams separately, leading to reduced light utilization efficiency and issues like color spots and uneven brightness due to excessive beam angles or concentration.
Innovation Solution
A homogenizing element with a first dichroic layer and a reflective layer, where the first dichroic layer allows one beam to pass through and reflect another, allowing for independent adjustment of beam angles by overlapping and non-parallel surfaces, ensuring uniform beam angles for different color beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional homogenizing element is used with multiple light sources, then the structure is simple, but the beam angles of different color beams cannot be adjusted separately, causing reduced light utilization efficiency and image quality issues
Solution Approach 1:
The homogenizing element is segmented into multiple independent working surfaces (first working surface, second working surface, third working surface) with different orientations. Each surface is configured to receive and homogenize beams from specific light sources, allowing independent beam angle control for different color beams without increasing overall structural complexity
Solution Approach 2:
Different regions of the homogenizing element have different local properties - each working surface is oriented at a specific angle matched to its corresponding light source's beam characteristics. This local customization of surface orientations enables separate beam angle adjustment for different color beams while maintaining a unified element structure
2Illumination intensity
If the homogenizing element increases beam angles for all beams, then the beam can cover the light valve, but the beam angle becomes excessively large causing color spots and uneven brightness
Solution Approach 1:
Each working surface is oriented at a specific angle tailored to its corresponding light source's beam characteristics. This local customization ensures that each color beam's angle is optimized individually - large enough to cover the light valve but not excessively large to cause color spots or brightness unevenness
Solution Approach 2:
The patent changes the orientation parameter of different working surfaces to match the beam angles of different light sources. By adjusting the inclination angles of the first, second, and third working surfaces separately, the system optimizes beam coverage and eliminates harmful effects like color spots and uneven brightness
3Object-generated harmful factors
If the homogenizing element decreases beam angles for all beams, then the beam angle becomes uniform, but the energy becomes excessively concentrated causing the same image quality issues
Solution Approach 1:
Instead of uniformly decreasing beam angles for all beams, the patent applies local quality by orienting different working surfaces at different angles. Each surface's orientation is specifically designed to achieve uniform beam angle for its corresponding color beam while maintaining appropriate energy distribution across the light valve
Solution Approach 2:
The patent changes the orientation parameters of individual working surfaces to achieve uniform beam angles for each color beam. By independently adjusting the inclination angles of different surfaces, the system maintains uniform beam characteristics without causing excessive energy concentration that would lead to image quality problems
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 solution enables the projection device to achieve good image quality by ensuring that all color beams are emitted at a uniform angle, improving light utilization and eliminating color spots and brightness issues.
Implementation Method 1
The first dichroic layer is disposed on the first surface and configured to allow a first beam to pass therethrough and reflect a second beam
Implementation Method 2
The reflective layer is disposed on the second surface and configured to reflect the first beam
Data Source
AI summary
A homogenizing element includes a light incident end, a light exit end, a first surface, a second surface, a reflective layer and a first dichroic layer. The first surface extends from the light incident end to the light exit end. The second surface extends from the light incident end to the light exit end, and the second surface overlaps the first surface and is non-parallel to the first surface. The first dichroic layer is disposed on the first surface and configured to allow a first beam to pass therethrough and reflect a second beam. The reflective layer is disposed on the second surface and configured to reflect the first beam. A projection device adopting the homogenizing element is also provided. The homogenizing element and the projection device provided can adjust the beam angles of different color beams respectively.