Etendue Increasing Module for Polarization Conversion System Overheating
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Solution Overview
Problem
The reliability of polarization conversion systems in projection display systems is reduced due to overheating caused by high optical power density, particularly when incident with laser light, as traditional glue-based connections are not resistant to high temperatures and accelerate aging.
Innovation Solution
A light source device comprising a first light source module, a second light source module, a polarization conversion system, and an etendue increasing module, where the etendue of the first light beam is increased to reduce optical power density on the polarization conversion system, thereby preventing overheating and enhancing system reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional glue-based connections are used in polarization conversion systems, then the system structure is simple and easy to manufacture, but the reliability is reduced due to overheating caused by high optical power density from laser light
Solution Approach 1:
The patent introduces an etendue increasing module as an intermediary component between the light source and the polarization conversion system. This module includes a first light source module with a first lens and a second light source module with a second lens, creating an intermediate optical path that increases etendue and reduces optical power density before light reaches the polarization conversion system, thereby protecting the glue-based connections from overheating while maintaining overall system simplicity
Solution Approach 2:
The patent changes the optical parameters of the light beam by increasing its etendue through the dual light source module configuration. By adjusting the optical path and increasing the beam's etendue (a parameter combining spatial and angular distribution), the optical power density is reduced without changing the fundamental glue-based connection structure of the polarization conversion system
2Illumination intensity
If laser light is used with high optical power density, then the brightness and intensity are improved, but the temperature increases causing overheating and accelerated aging of glue-based connections
Solution Approach 1:
The etendue increasing module serves as an intermediary optical system that decouples the high intensity light source from the temperature-sensitive polarization conversion system. The first and second light source modules with their respective lenses create an expanded optical path that delivers the required illumination intensity while distributing the energy over a larger area, preventing localized overheating
Solution Approach 2:
The patent converts the potentially harmful high optical power density into a beneficial expanded beam with increased etendue. By using the first and second light source modules to create an extended optical path, the concentrated energy that would cause overheating is transformed into a distributed energy pattern that maintains illumination intensity while reducing temperature rise
3Reliability
If the etendue of the light beam is increased using the first and second light source modules, then the optical power density is reduced preventing overheating, but the device complexity increases
Solution Approach 1:
The patent segments the light source system into two distinct modules: a first light source module with a first lens for generating part of the light beam, and a second light source module with a second lens for generating another part. This segmentation allows each module to be optimized independently while collectively achieving the etendue increase, making the complexity manageable through modular design
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 effectively increases the etendue of the first light beam, reducing the optical power density and preventing overheating, thus enhancing the reliability and longevity of the polarization conversion system by scattering and expanding the first light beam before it reaches the polarization conversion system.
Implementation Method 1
an etendue increasing module provided on a light path between the first light source module and the polarization conversion system and configured to increase the etendue of the first light beam
Implementation Method 2
The solution effectively increases the etendue of the first light beam, reducing the optical power density and preventing overheating, thus enhancing the reliability and longevity of the polarization conversion system by scattering and expanding the first light beam
Data Source
AI summary
Provided is a light source device, including a first light source module configured to output a first light beam; a second light source module configured to output a second light beam, etendue of the first light beam being smaller than etendue of the second light beam; a polarization conversion system configured to receive the first light beam and the second light beam and perform polarization conversion on at least one of the first light beam the second light beam; and an etendue increasing module provided on a light path between the first light source module and the polarization conversion system and configured to increase the etendue of the first light beam. Etendue of the first light beam incident on the PCS increases and the optical power density of the first light beam incident on the PCS decreases, thereby preventing overheating from affecting reliability of the polarization conversion system.