Light Source System for Laser Projection Displays
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Solution Overview
Problem
Traditional two-chip DMD projection systems using a laser-phosphor hybrid light source face issues with insufficient blue light due to optical losses as blue laser passes through multiple optical components, leading to reduced luminous efficacy and limited color gamut, especially in applications requiring high color accuracy like laser TVs and digital cinemas.
Innovation Solution
A light source system comprising a first light source, a second light source, a wavelength conversion device, and a first optical splitter that guides and homogenizes light to combine blue, red, and green light paths, reducing optical components and enhancing color purity and gamut range by minimizing blue light loss and optimizing the light path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If blue laser passes through multiple optical components to illuminate the color wheel, then yellow fluorescence can be generated, but optical loss occurs and luminous efficacy is reduced
Solution Approach 1:
The patent extracts the blue light path from the traditional color wheel system and separates it into an independent optical path. The blue laser directly illuminates the blue DMD without passing through the color wheel or wavelength conversion device, eliminating optical loss from multiple components while maintaining the ability to generate yellow light through the separate yellow light path.
Solution Approach 2:
The patent segments the light source system into independent blue light and yellow light paths. The blue light path uses a blue laser directly illuminating a blue DMD, while the yellow light path uses a blue laser illuminating a color wheel with yellow phosphor. This segmentation allows each path to be optimized independently, reducing overall optical loss.
2Loss of energy
If yellow light utilization is increased to improve luminous efficacy, then more blue light is required to maintain white light chromaticity, but this causes insufficient blue light
Solution Approach 1:
The patent enables the blue light path to serve itself by directly illuminating the blue DMD without requiring additional blue light from the yellow light conversion process. The blue laser directly provides the necessary blue light to the blue DMD, making the system self-sufficient for blue light requirements while allowing high yellow light utilization in the separate yellow light path.
Solution Approach 2:
By segmenting the light source into independent blue and yellow paths, the patent allows the blue path to provide dedicated blue light to the blue DMD while the yellow path converts blue light to yellow light for the yellow DMD. This segmentation resolves the conflict between high yellow light utilization and sufficient blue light availability.
3Ease of operation
If traditional color wheel with scattering area is used, then blue light can be transmitted, but additional optical components are required and optical path becomes complex
Solution Approach 1:
The patent extracts the blue light transmission function from the color wheel system by creating a separate blue light path that bypasses the color wheel entirely. The blue laser directly illuminates the blue DMD without requiring the color wheel's scattering area or any other wavelength conversion components, simplifying the optical path while maintaining light transmission capability.
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 improves luminous efficacy and color accuracy by correcting the proportion of primary colors and expanding the color gamut, reducing the need for additional light splitting and spot elimination, resulting in a more compact and efficient light source system suitable for high-color-requirement applications.
Implementation Method 1
a wavelength conversion device configured to perform a wavelength conversion on the first light to obtain third light
Implementation Method 2
a side surface of the first optical splitter being configured to homogenize the first light and the second light that are emitted to the first light combining device
Data Source
AI summary
Disclosed are a light source system and a display device, including: a first light source configured to emit first light; a second light source configured to emit second light; a wavelength conversion device configured to perform a wavelength conversion on the first light to obtain third light; a first optical splitter having a first area and a second area; and a first light combining device. The first optical splitter moves in timing sequence to make the first area and the second area be sequentially located on a preset light path. A side surface of the first optical splitter is configured to homogenize the first light and the second light that are emitted to the first light combining device; and the first light combining device is configured to guide the first light, the second light, and the third light to exit along a same light path to form illumination light.