Projection Light Source Layout for Compact High-Brightness Illumination
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Solution Overview
Problem
Existing image projection apparatuses face challenges in reducing size while maintaining high brightness and efficiency, particularly when using a combination of light sources for generating primary colors, as conventional arrangements increase device height and complexity.
Innovation Solution
Optimizing the arrangement of light source units by aligning their centers and optical axes to minimize the vertical gap between them, using a prism to combine light beams, and employing a rod integrator for homogenization, thereby reducing device height without compromising optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light source units are arranged vertically to generate primary colors, then brightness and color generation capability are improved, but device height and complexity increase
Solution Approach 1:
The patent transitions from a vertical arrangement of light source units to a horizontal arrangement, changing the spatial dimension. Multiple light source units are positioned side-by-side in the horizontal direction, with their optical axes aligned to converge on a common focal point, thereby reducing device height while maintaining brightness through parallel optical paths
Solution Approach 2:
The patent merges multiple light source units and their optical components into a compact integrated structure. The light source units, wavelength converters, and optical systems are arranged to share common spatial space and optical paths, consolidating what would traditionally be separate vertical stacks into a unified horizontal arrangement that reduces overall device height
2Volume of moving object
If light source units are positioned close together to reduce device size, then compactness is improved, but optical performance and brightness may be compromised
Solution Approach 1:
The patent uses horizontal arrangement instead of vertical stacking, allowing light source units to be positioned close together in the horizontal dimension while maintaining optimal optical performance. The optical axes are aligned to converge on a common focal point, ensuring that despite close positioning, the optical paths remain effective and brightness is maintained
Solution Approach 2:
The patent employs asymmetric positioning of light source units relative to the common focal point. The light source units are arranged at different positions along the optical axis but all converge on the same focal point, creating an asymmetric layout that allows compact spacing while maintaining optical performance through precise focal alignment
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 optimized arrangement reduces the size of the illumination device while maintaining high brightness and efficiency, allowing for a more compact image projection apparatus design.
Implementation Method 1
a light combiner to: bend the light beam to guide the light beam into the light homogenizer in one direction, and guide said another light beam into the light homogenizer in a another direction parallel to said one direction
Implementation Method 2
a wavelength converter rotatable to convert a wavelength of the light beam
Implementation Method 3
a light homogenizer to homogenize the light beam and said another light beam
Data Source
AI summary
An illumination device includes: a light source unit including: a light source to emit a light beam; and a wavelength converter rotatable to convert a wavelength of the light beam; another light source unit including: another light source to emit another light beam; and another wavelength converter rotatable to convert another wavelength of said another light beam; a light homogenizer to homogenize the light beam and said another light beam; and a light combiner to: bend the light beam to guide the light beam into the light homogenizer in one direction, and guide said another light beam into the light homogenizer in a another direction parallel to said one direction.