Projection Illumination Light Guide for Green Path Merging
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Solution Overview
Problem
The issue of reduced light efficiency and image quality in projection apparatuses due to the partial overlap of green laser light and green fluorescent light wavelengths, leading to the need to sacrifice part of the fluorescence band to allow green laser light to pass through a dichroic film, is addressed.
Innovation Solution
An illumination system utilizing a light source module with multiple laser light sources, a wavelength conversion element, and a light guide module with a full-spectrum light splitting element and reflection element to guide and reflect different parts of the illumination light beam to a converging element, avoiding spectral loss typically caused by dichroic mirrors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dichroic film is used to merge the green laser light path and green fluorescent light path, then the green laser light can pass through and merge with the green fluorescent light path, but part of the brightness of the fluorescence band is sacrificed, resulting in reduced light efficiency
Solution Approach 1:
The illumination system divides the light paths into separate channels: a first light path for green fluorescent light and a second light path for green laser light. By segmenting the light paths rather than merging them through a dichroic film, the system avoids spectral overlap losses while maintaining the ability to provide both green light sources to the display panel.
2Ease of operation
If part of the fluorescence band brightness is sacrificed to allow green laser light to pass through the dichroic film, then the green laser light can be transmitted, but the overall light utilization efficiency deteriorates
Solution Approach 1:
The system segments the optical paths using separate light paths for fluorescent light and laser light, eliminating the need for spectral filtering that would reduce overall light utilization efficiency.
Solution Approach 2:
The patent introduces a beam combiner as an intermediary device that merges the separated first light path (green fluorescent light) and second light path (green laser light) into a unified output. This intermediary enables both light sources to be transmitted efficiently without spectral overlap losses.
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 enhances light utilization efficiency, allowing projection apparatuses to provide higher brightness and reduce speckle phenomena, while effectively combining light paths to improve image quality.
Implementation Method 1
A light path of a laser light beam generated by a three-color pure laser and a light path of a conversion light beam (such as fluorescence) generated by excitation of a wavelength conversion element (including phosphor) by the laser
Implementation Method 2
The first full-spectrum light splitting element is configured to guide a first part of the illumination light beam to a first area of the light converging element, and is configured to guide a second part of the illumination light beam to the reflection element
Data Source
AI summary
Disclosed is a projection apparatus and an illumination system. The illumination system is configured provide an illumination light beam. The illumination system includes a light source module, a wavelength conversion element, and a light guide module. The light source module includes a first laser light source, a second laser light source, and a third laser light source, respectively configured to emit a first laser light beam, a second laser light beam, and a third laser light beam. The wavelength conversion element is configured to convert the first laser light beam to a conversion light beam in sequence. The light guide module includes a first full-spectrum light splitting element and a reflection element. The second laser light beam and the third laser light beam are incident on a first side of the first full-spectrum light splitting element, and the conversion light beam is incident on a second side thereof.