Projector Light Source Device Segmented Diffusion Element
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Solution Overview
Problem
Existing light source devices for projectors, which use rotary diffuser plates, face increased cost and size due to necessary accessory components, and suffer from reliability issues as luminance increases, leading to potential damage of the diffusion element under high light load.
Innovation Solution
A light source device featuring a diffusion element with multiple diffusion areas corresponding to partial light beams divided by an optical element, such as a lens array, and a polarization split element to distribute light evenly, reducing the load on the diffusion element and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a rotary diffuser plate is used to diffuse light beams, then uniform illuminance distribution can be achieved, but accessory components such as a driving motor, power supply, and control circuit become necessary, increasing cost and device size
Solution Approach 1:
The diffusion element is divided into multiple diffusion areas (first diffusion area, second diffusion area, etc.) that correspond to different partial light beams. Each diffusion area processes a specific portion of the light beam, enabling uniform illuminance distribution without requiring a rotary mechanism. This segmentation allows the system to achieve the function of a rotary diffuser using a stationary, simpler structure.
2Device complexity
If a stationary diffusion element is used to reduce device complexity, then accessory components are eliminated, but the light density on the diffusion element increases locally, increasing the load and potentially degrading reliability
Solution Approach 1:
The diffusion element is divided into multiple diffusion areas that correspond to different partial light beams. By distributing the light beams across multiple diffusion areas, the light density on each individual diffusion area is reduced, thereby decreasing the load on the diffusion element and improving reliability while maintaining a simple stationary structure.
Solution Approach 2:
The patent introduces an optical element (such as a lens array) that divides the light beams into multiple partial light beams before they reach the diffusion element. This adds a dimensional aspect to the light distribution, spreading the light load across multiple spatial locations on the diffusion element, thereby reducing local light density and improving reliability.
3Illumination intensity
If the number of diffusion areas is increased to match the number of light emitting elements, then light distribution is improved, but the number of components and complexity increases
Solution Approach 1:
The patent allows for the number of diffusion areas to be no larger than the number of light emitting elements. This means that fewer diffusion areas can be used compared to the number of light sources, achieving acceptable light distribution without requiring a one-to-one correspondence. This partial action approach reduces the number of diffusion areas needed, thereby simplifying the device while maintaining adequate performance.
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 decreases the likelihood of diffusion element damage, increases reliability, and maintains uniform illuminance distribution while reducing the number of components and ensuring efficient light diffusion, thereby improving the projector's performance.
Implementation Method 1
an optical element configured to divide the light beams emitted from the plurality of light emitting elements into a plurality of partial light beams
Implementation Method 2
a diffusion element which light beams including a plurality of beams emitted from the plurality of light emitting elements enter, and which diffuses the light beams
Implementation Method 3
a polarization split element to distribute light evenly
Data Source
AI summary
A light source device according to the present disclosure includes a plurality of light emitting elements, a diffusion element which light beams including a plurality of beams emitted from the plurality of light emitting elements enter, and which diffuses the light beams, and an optical element configured to divide the light beams emitted from the plurality of light emitting elements into plurality of partial light beams, wherein the diffusion element has a plurality of diffusion areas disposed so as to correspond to the plurality of partial light beams obtained by the optical element dividing the light beams emitted from the plurality of light emitting elements.