Projection Illumination System Light Path Segmentation
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Solution Overview
Problem
The existing illumination systems for projection apparatuses suffer from significant blue light efficiency loss due to overly long blue light paths, which affects the overall performance and efficiency of the light beam transmission.
Innovation Solution
The implementation of an illumination system that includes an excitation light source, a series of light splitting elements, and a wavelength conversion element to create two light paths, allowing for the efficient transmission and conversion of light beams, thereby reducing energy loss and shortening the light paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional illumination system uses a single long light path with phosphor wheel and optical elements to generate red and green light, then the system can achieve color saturation and brightness requirements, but the blue light path becomes overly long causing significant energy loss
Solution Approach 1:
The patent divides the single long light path into two separate light paths: a first light path for generating red light and a second light path for generating green light. This segmentation allows each path to be optimized independently, reducing the overall path length and energy loss while maintaining color quality.
Solution Approach 2:
The patent transitions from a single-dimensional long light path to a two-dimensional configuration with parallel first and second light paths. This dimensional change enables shorter individual paths while achieving the same color output through multiple routes.
2Adaptability or versatility
If the blue light path is extended to include phosphor excitation and optical filtering elements, then red and green light can be generated, but the transmission distance increases causing energy loss
Solution Approach 1:
The patent segments the color generation process into two separate paths: the first light path generates red light through phosphor excitation, while the second light path generates green light through a different mechanism. This segmentation reduces the required path length for each individual color generation process.
Solution Approach 2:
The patent introduces a beam combining element as an intermediary that merges the first light beam and second light beam to form the final illumination light beam. This intermediary enables efficient path integration without requiring excessively long individual paths.
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 effectively reduces energy loss and shortens light paths, enhancing the overall efficiency of the light beam transmission and improving the performance of the projection apparatus.
Implementation Method 1
The first light splitting element is located on a light path of the light beam, and configured to allow the light beam to pass through to generate a first light beam or reflect the light beam to generate a second light beam
Implementation Method 2
The wavelength conversion element is located on a light path of the first light beam... configured to allow the first light beam to pass through to be transmitted to the wavelength conversion element to generate a third light beam
Implementation Method 3
The second light splitting element is located on a light path of the third light beam, and configured to reflect the third light beam
Implementation Method 4
The third light splitting element is located on a light path of the second light beam, and configured to reflect the second light beam
Implementation Method 5
The fourth light splitting element is located on the light paths of the second light beam and the third light beam, and configured to allow the second light beam to pass through and reflect the third light beam
Data Source
AI summary
An illumination system including an excitation light source, a first light splitting element, a wavelength conversion element, a second light splitting element, a third light splitting element and a fourth light splitting element is provided. The excitation light source provides a light beam. The first light splitting element allows the light beam to pass through to generate a first light beam or reflects it to generate a second light beam. The wavelength conversion element is located on a light path of the first light beam. The second light splitting element allows the first light beam to pass through to be transmitted to the wavelength conversion element to generate a third light beam and reflects the third light beam. The third light splitting element reflects the second light beam. The fourth light splitting element allows the second light beam to pass through and reflects the third light beam.