Projector Light Source Layout for Rectangular Scan Illumination
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Solution Overview
Problem
Existing projectors face challenges in effectively generating rectangular illumination light orthogonal to the scanning direction due to the use of a polygon mirror, which complicates efficient light distribution on the liquid crystal light valve.
Innovation Solution
A light source system that includes a light source section emitting beams along different axes, a light enlargement system using lenticular lenses to generate enlarged light, and a scanning section to superimpose and scan this light on the illuminated region, ensuring efficient rectangular illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polygon mirror is used to condense light on the liquid crystal light valve, then light reflection and condensation are achieved, but it is difficult to effectively generate rectangular illumination light extending in the direction orthogonal to the scanning direction
Solution Approach 1:
The patent replaces the polygon mirror (mechanical optical element) with a light enlargement system consisting of a first lenticular lens and a second lenticular lens. This substitution allows for more effective control and shaping of light distribution, enabling the generation of rectangular illumination light extending in the direction orthogonal to the scanning direction while maintaining ease of operation through the lens-based optical system.
2Quantity of substance
If a polygon mirror condenses light while reflecting, then light concentration is achieved, but the structural complexity increases and light distribution control becomes difficult
Solution Approach 1:
The patent substitutes the polygon mirror structure with a lens-based light enlargement system. The first lenticular lens and second lenticular lens work together to concentrate and shape light without requiring the complex mechanical structure of a polygon mirror, thereby reducing device complexity while maintaining effective light concentration and distribution control.
Solution Approach 2:
The patent introduces lenticular lenses as intermediary optical elements between the light source and the liquid crystal light valve. These lenses serve as mediators that effectively concentrate and shape light, providing a simpler alternative to the polygon mirror while achieving the desired light concentration and distribution effects.
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 allows for enhanced uniformity and efficiency in illuminating the image formation region of the light modulation device, improving the quality and brightness of projected images.
Implementation Method 1
a light enlargement system that generates an enlarged light by enlarging the light in a direction along a second axis orthogonal to the first axis
Implementation Method 2
a light scanning section that scans with a light incident from the superimposing optical system in the direction along the first axis on the illuminated region
Data Source
AI summary
A light source according to the present disclosure includes a light source section that emits a light including a first beam and a second beam arranged in a direction along a first axis, in a direction intersecting the first axis, a light enlargement system that generates an enlarged light by enlarging the light in a direction along a second axis orthogonal to the first axis, a superimposing optical system that superimposes the enlarged light emitted from the light enlargement system on an illuminated region, and a light scanning section that scans with a light incident from the superimposing optical system in the direction along the first axis on the illuminated region.