Light Source Module with Integrated Polarization Conversion
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Solution Overview
Problem
Conventional projection apparatuses using mixed light sources with blue lasers and LEDs require numerous optical devices, increasing size and complexity due to the need for multiple reflectors and optical paths for color generation and combination.
Innovation Solution
A light source module incorporating a light-emitting device, a wavelength conversion device with rotating wavelength and polarization conversion areas, and a polarization and color separation unit to guide excitation and converted color beams in a single direction, reducing the number of optical devices and apparatus size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple reflectors and optical paths are used to guide blue laser and combine colors, then color generation and combination is achieved, but the number of optical devices increases and apparatus size increases
Solution Approach 1:
The patent combines multiple optical functions (wavelength conversion, polarization conversion, and beam combining) into a single integrated wavelength conversion device. This merging of functions eliminates the need for separate reflectors and optical paths, directly reducing the number of optical devices while maintaining color generation capability
Solution Approach 2:
The wavelength conversion device is designed to perform multiple functions simultaneously: it converts blue laser wavelength to red light, converts polarization direction, and combines multiple color beams. This multi-functionality allows a single device to replace what would traditionally require multiple separate optical components
2Ease of manufacture
If multiple reflectors and optical paths are used to guide blue laser and combine colors, then color generation and combination is achieved, but apparatus size increases
Solution Approach 1:
By merging wavelength conversion, polarization conversion, and beam combining functions into one compact device, the patent dramatically reduces the spatial footprint required for color generation, directly addressing the apparatus size issue
Solution Approach 2:
The patent utilizes polarization dimension to achieve beam combining and color generation. By converting and utilizing polarization states rather than relying on multiple spatial reflectors and optical paths, the system reduces the physical space required in the traditional dimensional layout
3Device complexity
If a compact light source module is designed with integrated wavelength conversion device, then apparatus size is reduced and optical device count is reduced, but maintaining high color fidelity and efficiency becomes challenging
Solution Approach 1:
The wavelength conversion device incorporates distinct functional areas with specialized properties: a wavelength conversion area for converting blue to red light, and a polarization conversion area for manipulating polarization states. Each area is optimized for its specific function to ensure high color fidelity despite the integrated compact design
Solution Approach 2:
Within the integrated wavelength conversion device, the patent segments different functional regions (wavelength conversion area and polarization conversion area) to handle different aspects of light manipulation. This internal segmentation allows each region to be optimized for its specific task, maintaining overall color fidelity
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 simplifies the light transmission path, miniaturizes the light source module, and results in a smaller projection apparatus with reduced optical device count, maintaining high color fidelity and efficiency.
Implementation Method 1
When the first portion beam irradiates the first wavelength conversion area, the first portion beam is converted into a first color beam
Implementation Method 2
When the first portion beam irradiates the polarization conversion area, the first polarization direction of the first portion beam is converted into a second polarization direction
Implementation Method 3
The polarization and color separation unit is suitable for transmitting the first portion beam with the first polarization direction and reflecting the first portion beam with the second polarization direction and the first color beam to a same direction
Data Source
AI summary
A light source module includes a light-emitting device, a wavelength conversion device and a polarization and color separation unit. The light-emitting device provides an excitation beam including a first portion beam having a first polarization direction. The wavelength conversion device includes a first wavelength conversion area and a polarization conversion area. When the first portion beam irradiates the first wavelength conversion area, the first portion beam is converted into a first color beam. When the first portion beam irradiates the polarization conversion area, the first polarization direction of the first portion beam is converted to a second polarization direction. The polarization and color separation unit is disposed between the wavelength conversion device and the light-emitting device, and transmits the first portion beam with the first polarization direction, and reflects the first portion beam with the second polarization direction and the first color beam to the same direction.