Scattering Element with Variable Haze for Laser Projectors
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Solution Overview
Problem
In laser projectors, the inconsistent light-emitting angles of red, green, and blue light result in uneven color uniformity and reduced light entrance efficiency due to the use of scattering elements to enlarge the field angle.
Innovation Solution
The illumination system incorporates a scattering element with multiple scattering areas of different haze values, where the first scattering area near the center has a higher haze value than the second scattering area farther from the center, positioned between the light-source module and the light uniforming element to enhance light distribution and energy utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a scattering element is used to enlarge the field angle of color lights, then color uniformity distribution is improved, but light entrance efficiency of the light uniforming element decreases
Solution Approach 1:
The scattering element is designed with different haze values in different regions: the first region (closer to the optical axis) has a first haze value, while the second region (farther from the optical axis) has a second haze value that is lower than the first. This local differentiation allows the central region to provide strong scattering for color uniformity, while the peripheral region maintains higher light transmission efficiency, thus resolving the contradiction between color uniformity and light entrance efficiency.
2Speed
If the haze value of the scattering element is increased to improve light scattering, then the field angle is enlarged, but light transmission efficiency decreases
Solution Approach 1:
Different regions of the scattering element have different haze values optimized for their specific functions. The first region with higher haze value provides the necessary light scattering to enlarge the field angle, while the second region with lower haze value ensures sufficient light transmission, thereby resolving the contradiction between field angle enlargement and light transmission efficiency.
Solution Approach 2:
The scattering element is divided into at least two distinct regions with different optical properties (haze values). This segmentation allows each region to perform its specific function optimally: the first region focuses on light scattering for field angle control, while the second region focuses on light transmission, thus resolving the contradiction between these two opposing requirements.
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 improves color uniformity and increases light energy utilization by adjusting the field angle and haze values of the scattering areas, ensuring effective light guidance to the light uniforming element.
Implementation Method 1
a scattering element is usually used to enlarge a field angle of each of the color lights
Implementation Method 2
Light from the light uniforming element is propagated to the light valve after passing through a condenser lens
Implementation Method 3
the projection lens is disposed on a propagation path of the image beam, and is used to project the image beam from the projection device
Data Source
AI summary
An illumination system for providing an illumination light beam is provided, which includes a light-source module, a scattering element and a light uniforming element. The light-source module emits an illumination light beam. The scattering element is between the light-source module and the light uniforming element, and has multiple scattering areas with different haze values. A haze value of a first scattering area that is close to a center of the scattering element is greater than a haze value of a second scattering area that is remote from the center. A projection device is also provided. A scattering element of the invention has multiple scattering areas with different haze values, and a haze value of one that is close to a center of the scattering element is greater than a haze value of the other that is remote from the center, thereby increasing light energy utilization.