Light Source Device for Projectors with Flux Width Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In projector systems using laser sources for illumination, the difference in light flux widths of red, green, and blue light beams leads to color unevenness due to varying output powers and Lambertian light distribution of green fluorescence, requiring adjustments in the number of laser sources to achieve intensity balance.
Innovation Solution
A light source device comprising a first, second, and third light source part emitting blue, green, and red light fluxes respectively, with light combiners to adjust and combine these fluxes to achieve uniform light flux widths, reducing color unevenness by approximating the light flux widths of the combined light to match the red light flux width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of laser sources is adjusted to achieve light intensity balance, then the light intensity balance is improved, but the light flux width difference increases causing color unevenness
Solution Approach 1:
The patent changes the light flux width parameter of individual color channels (red, green, blue) by introducing optical elements such as cylindrical lenses and light flux width adjustment mechanisms. This allows each color channel to have its light flux width independently adjusted to match a reference width, thereby achieving uniform color distribution without needing to change the number of laser sources.
2Illumination intensity
If different numbers of laser sources are used for red and blue light, then the light intensity balance is achieved, but the device complexity increases
Solution Approach 1:
Instead of changing the number of laser sources, the patent adjusts the light flux width parameter of each color channel using optical elements. This maintains a uniform number of laser sources while achieving both light intensity balance and color uniformity, thereby reducing device complexity.
3Area of stationary object
If the light flux width of green fluorescence is large due to Lambertian distribution, then the illumination area is increased, but the color uniformity deteriorates
Solution Approach 1:
The patent introduces optical elements such as cylindrical lenses and light flux width adjustment mechanisms to control and uniformize the light flux width of green fluorescence. This allows the green light to maintain adequate illumination area while achieving uniform color distribution by matching its light flux width to the reference width.
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 suppresses color unevenness in projected images by uniformly adjusting the light flux widths of blue, green, and red light beams, enhancing display quality and reducing the size of the light source device.
Implementation Method 1
The first light combiner is configured to make a light flux width of the first light flux emitted from the first light combiner larger than a light flux width of the first light flux entering the first light combiner
Implementation Method 2
a first light combiner configured to enlarge a light flux width of the first light flux, and combine the first light flux and the second light flux with each other to generate a first combined light flux
Implementation Method 3
a second light combiner configured to combine the first combined light flux and the third light flux with each other to generate a second combined light flux
Implementation Method 4
a third light source part configured to emit a third light flux in a third wavelength band different from the first wavelength band and the second wavelength band
Data Source
AI summary
A light source device according to the present disclosure includes a first light source configured to emit a first light flux, a second light source configured to emit a second light flux, a third light source configured to emit a third light flux, a first light combiner configured to enlarge a first light flux width of the first light flux, and combine the first light flux and the second light flux to generate a first combined light flux, and a second light combiner configured to combine the first combined light flux and the third light flux with each other to generate a second combined light flux. The first light flux width is equal to a second light flux width of the second light flux or smaller than the second light flux width, and the first light flux width is smaller than a third light flux width.