Multicolor Light Mixing Layout for Uniform Laser Projection
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Solution Overview
Problem
Conventional laser projection apparatuses experience uneven color distribution due to the side-by-side arrangement of red, green, and blue laser diodes, leading to reduced image projection quality.
Innovation Solution
A multicolor light mixing module utilizing a light-dividing unit to guide first and second color lights along different axes and a light-mixing unit to combine these lights, accompanied by a light-homogenizing member and condensing lens to ensure even color distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If red, green, and blue laser diodes are arranged in a side-by-side arrangement, then the overall volume of the laser source can be reduced, but uneven color distribution occurs on the projected image
Solution Approach 1:
The patent segments the light paths by introducing a light-dividing unit that separates the light from different laser diodes into different light-dividing axes. This segmentation allows each color light to be independently directed and mixed, resolving the color distribution uniformity issue while maintaining the compact side-by-side arrangement of laser diodes.
Solution Approach 2:
The patent introduces a light-mixing unit as an intermediary component between the laser diodes and the projection system. This light-mixing unit receives light from multiple laser diodes through the light-dividing unit and combines them into a uniformly mixed multicolor laser beam, thereby achieving color distribution uniformity without increasing the overall volume.
2Device complexity
If multiple laser diodes are arranged in multiple rows sequentially, then the device complexity is reduced, but image projection quality deteriorates due to uneven color distribution
Solution Approach 1:
The patent transforms the problem from a two-dimensional arrangement issue to a three-dimensional optical path control problem. By introducing light-dividing axes and light-mixing axes in different spatial dimensions, the system achieves uniform color distribution while maintaining the simple sequential arrangement of laser diodes in multiple rows.
3Volume of moving object
If a compact laser source design is used, then the overall volume is reduced, but color uniformity across the projected image is compromised
Solution Approach 1:
The patent implements a nested structure where the light-dividing unit and light-mixing unit are integrated within the compact laser source housing. The light-dividing axes and light-mixing axes are arranged in a nested configuration that maximizes space utilization, achieving both compact volume and uniform color distribution.
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 addresses uneven color distribution, enhancing image projection quality and color uniformity by ensuring proper color light proportions across the projected image.
Implementation Method 1
The light-dividing unit is obliquely disposed opposite to the first laser set to allow partial transmission and partial reflection of the first color light and the second color light, for guiding the first color light to travel along a first light-dividing axis and a second light-dividing axis respectively
Implementation Method 2
The light-mixing unit is obliquely disposed opposite to the light-dividing unit for mixing the first color light and the second color light to form a first laser beam along a first light-mixing axis and form a second laser beam along a second light-mixing axis
Implementation Method 3
The condensing lens is disposed on the first light-mixing axis and the second light-mixing axis and located between the light-homogenizing member and the light-mixing unit, for condensing the first laser beam and the second laser beam
Implementation Method 4
The light-homogenizing member is disposed on the first light-mixing axis and the second light-mixing axis for homogenizing the first laser beam and the second laser beam
Data Source
AI summary
A multicolor light mixing module includes a light-dividing unit, a light-homogenizing member, a first laser set including first and second lighting units in a sequential arrangement, a light-mixing unit obliquely opposite to the light-dividing unit for guiding a first color light of the first lighting unit and a second color light of the second lighting unit along first and second light-mixing axes to form first and second laser beams, and a condensing lens. The light-dividing unit is obliquely opposite to the first laser set to allow partial transmission and partial reflection of the first and second color lights, for guiding the first and second color lights along first and second light-dividing axes. The light-homogenizing member is disposed on the first and second light-mixing axes for homogenizing the first and second laser beams. The condensing lens between the light-homogenizing member and the light-mixing unit condenses the first and second laser beams.