Light Source Module for Uniform Color Projection
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Solution Overview
Problem
Current laser projection equipment experiences color unevenness and light spots due to the sequential arrangement of red, green, and blue laser diodes, leading to poor image projection quality.
Innovation Solution
A light source module comprising a laser light source, dichroic mirrors, a focusing lens, a diffuser module, a light combining element, and a reflector, where the laser light source emits colors in parallel, and dichroic mirrors and the diffuser module work together to ensure even color distribution and integration of light, addressing the issue of color uniformity and light spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If red, green, and blue laser diodes are sequentially arranged in multiple rows to reduce module volume, then the volume of the light source module is reduced, but color unevenness and light spots appear in the projected image
Solution Approach 1:
The patent divides the laser diode array into multiple independent rows, each emitting a specific color (red, green, blue). By segmenting the light source into distinct color channels and using separate optical paths for each, the system maintains color uniformity while achieving compact packaging. Each color channel is independently controlled and combined through dichroic mirrors, preventing color unevenness even in a reduced-volume configuration.
Solution Approach 2:
The patent introduces dichroic mirrors as intermediary optical elements to combine the light from different color channels. These mirrors selectively reflect specific wavelengths while allowing others to pass through, enabling precise control over color mixing. This intermediary mechanism ensures uniform color distribution in the final projected image, resolving the color unevenness problem that would otherwise result from compact sequential arrangement of laser diodes.
2Adaptability or versatility
If laser diodes are arranged in multiple rows to achieve light combining, then the light combining function is achieved, but light spots and flickering occur due to high coherence
Solution Approach 1:
The patent segments the laser diode emission into multiple spatially separated rows with distinct color channels. By dividing the coherent light source into separate channels and processing them through independent optical paths, the system reduces the harmful effects of high coherence such as light spots and flickering. The segmented approach allows for better control and mixing of light waves, diminishing interference patterns.
Solution Approach 2:
The patent employs dichroic mirrors and diffusers as intermediary elements to mix the coherent light from different laser diode rows. These intermediaries help to scramble the phase relationships between the coherent beams, reducing visibility of interference patterns and flickering. The diffuser module, in particular, acts as a mediator that randomizes the coherent light properties while maintaining the combined light output.
3Adaptability or versatility
If dichroic mirrors are used to combine different color lights, then color integration is achieved, but color unevenness occurs in the projected image
Solution Approach 1:
The patent applies local quality by positioning diffuser modules at specific locations within the optical path where light from different color channels converges. These diffusers are strategically placed to address local color unevenness issues in different regions of the projected image. By applying diffusion treatment at critical locations rather than uniformly throughout the system, the patent achieves color uniformity while maintaining the color integration function of the dichroic mirrors.
Solution Approach 2:
The patent introduces diffuser modules as intermediary elements between the dichroic mirrors and the projection lens. These diffusers act as mediators that evenly distribute the combined light from different color channels across the projection area. The diffusers compensate for any color unevenness introduced by the dichroic mirror arrangement, ensuring uniform color distribution in the final projected image while preserving the color integration capability.
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 color uniformity and reduces light spots, resulting in enhanced image projection quality by ensuring even distribution and integration of different color lights, providing a uniform color image screen.
Implementation Method 1
The first dichroic mirror is disposed corresponding to the first color light to reflect the first color light, in which the first dichroic mirror allows the second color light to pass through. The second dichroic mirror is staggered with the first dichroic mirror in the second direction and disposed corresponding to the second color light to reflect the second color light, in which the second dichroic mirror allows the first color light to pass through.
Implementation Method 2
a diffuser module, a light combining element, a reflector, and a diffuser. The laser light source emits a first color light and a second color light along a first direction
Implementation Method 3
The focusing lens includes a first portion and a second portion arranged in the first direction, in which the first portion is disposed corresponding to the first dichroic mirror, and the second portion is disposed corresponding to the second dichroic mirror.
Implementation Method 4
The first dichroic mirror is disposed between the first portion and the reflector, and the reflector and the light combining element are arranged in the first direction.
Data Source
AI summary
A light source module includes a laser light source, first and second dichroic mirrors, a focusing lens, a diffuser module, a light combining element, a reflector, and a diffuser. The laser light source emits a first color light and a second color light along a first direction. The focusing lens includes a first portion and a second portion arranged in the first direction. The first portion is disposed between the diffuser module and the first dichroic mirror, and the second portion is disposed between the diffuser module and the second dichroic mirror. The second dichroic mirror is disposed between the second portion and the light combining element, and the light combining element reflects at least a portion of the first color light and allows at least a portion of the second color light to pass through. The first dichroic mirror is disposed between the first portion and the reflector.