Beam-Splitting Element With Pattern Films For Uniform Projection
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Solution Overview
Problem
Projection devices using laser light sources face challenges in achieving uniform image quality due to limited angular and energy distribution control of colored lights entering the light-homogenizing element, primarily caused by manufacturing tolerances in beam-splitting films.
Innovation Solution
A beam-splitting element with a first and second pattern film, configured to control the ratio of area occupied in the second region, allowing specific wavelength light beams to penetrate or reflect, optimizing the angle and energy distribution of sub-laser beams entering the light-homogenizing element, and further enhanced by a diffusion layer for improved uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single-piece beam-splitting film is used to control light distribution, then the angle and energy distribution of colored lights entering the light-homogenizing element can be controlled, but manufacturing tolerance causes errors in penetration/reflection ratio depending on incident position
Solution Approach 1:
The beam-splitting film is divided into multiple independent pattern regions (first pattern film and second pattern film) that are not overlapped. Each pattern region independently controls light for specific color channels, eliminating the cumulative error problem of single-piece films and ensuring consistent penetration/reflection ratios across different incident positions.
Solution Approach 2:
Different regions of the beam-splitting film are assigned different optical properties (transmission or reflection) based on the specific color channel requirements. The first pattern film allows transmission for certain wavelengths while the second pattern film provides reflection for other wavelengths, optimizing light distribution for each color channel independently.
2Volume of moving object
If the light source is placed on a specific side to reduce system size, then the system compactness is improved, but the angle and energy distribution of colored lights entering the light-homogenizing element are limited
Solution Approach 1:
The beam-splitting film patterns are arranged in specific geometric configurations (e.g., alternating transmission and reflection regions) that manipulate light paths in multiple dimensions. This allows the compact single-side light source arrangement to still achieve proper angular distribution and energy balance at the light-homogenizing element through clever spatial arrangement of the pattern regions.
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 improves image uniformity and quality by controlling the angle and energy distribution of light beams, resulting in a uniformly colored image projection.
Implementation Method 1
The first pattern film is located on the second region and is configured to allow a light beam with an emission wavelength within a first waveband range to penetrate
Implementation Method 2
The second pattern film is located on the second region and is configured to reflect the light beam with the emission wavelength within the first waveband range
Data Source
AI summary
A beam-splitting element and a projection device provide an image with good uniformity. The beam-splitting element has first and second regions, and the beam-splitting element includes first and second pattern films. The first pattern film is located on the second region and allows a light beam with an emission wavelength within a first waveband range to penetrate. The second pattern film is located on the second region and reflects the light beam with the emission wavelength within the first waveband range. The first and second pattern films are not overlapped with each other, and the first and second pattern films form a beam-splitting pattern together on the second region. A ratio of an area of the first pattern film occupied in the second region is between 30% and 70%. The beam-splitting element of the invention provides an image projected from the projection device with good uniformity.