Light Source Module Anisotropic Optical Power Uniformity
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Solution Overview
Problem
Light source modules in projectors often fail to achieve uniform light intensity distribution, which affects the quality of the projected image.
Innovation Solution
A light source module comprising a light source that emits multiple light beams with different peak wavelengths, which are incident on a first optical element with varying optical power in different directions, allowing for the superposition of these beams to achieve uniform intensity through a fly's-eye lens, thereby reducing beam spread and enhancing image uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light source module is used, then the structure is simple, but the light intensity distribution is non-uniform
Solution Approach 1:
The first optical element is designed with non-uniform optical power distribution across its surface, with different optical powers in different regions to compensate for the non-uniform light intensity from the light source. This local variation in optical properties achieves uniform overall light intensity distribution without requiring complex additional components.
Solution Approach 2:
The patent changes the optical power parameter of the first optical element spatially, creating regions with different optical powers to match and compensate for the spatial variation in light source intensity. This parameter variation approach transforms a uniform optical element into one that produces uniform output despite non-uniform input.
2Illumination intensity
If multiple light beams with different wavelengths are used, then the light intensity distribution can be uniform, but the device complexity increases
Solution Approach 1:
The first optical element is designed to handle multiple wavelengths simultaneously with a single unified structure, rather than requiring separate optical elements for each wavelength. The element's varying optical power configuration works across the entire spectral range, simplifying the overall device while achieving uniform intensity 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 enables the attainment of a uniform light intensity distribution, improving the quality of projected images by ensuring even illumination and reducing beam divergence, thus enhancing the projector's performance.
Implementation Method 1
The first optical element has an optical power in the second direction greater than an optical power of the first optical element in the third direction
Data Source
AI summary
A light source module includes a light source and a first optical element. The light source is configured to emit first and second light beams. The first optical element has a first surface on which the first second light beam are to be incident. The first light beam and the second light beam are incident on the first surface along a first direction such that the first light beam is incident at a first position on the first surface and the second light beam is incident at a second position on the first surface. The first light beam has a first width in a second direction intersecting the first direction on the first surface, and a second width in a third direction intersecting a plane including the first direction and the second direction on the first surface. The first width is greater than the second width. The second light beam has a third width in the second direction on the first surface, and a fourth width in the third direction on the first surface. The third width is greater than the fourth width. A direction from the second position to the first position intersects the third direction. The first light beam has a first peak wavelength, and the second light beam has a second peak wavelength different from the first peak wavelength of the first light beam. The first optical element has an optical power in the second direction greater than an optical power of the first optical element in the third direction.