Segmented Reflector for Polarized Light Source Thermal Management
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Solution Overview
Problem
Existing display systems using polarized light beams for high-intensity illumination of screens face heating issues due to light recycling, which can lead to malfunction or reduced light intensity to prevent overheating.
Innovation Solution
A reflector design with distinct surface portions, where one portion reflects light from the light source directly to the filter and another portion reflects light from the filter back to the light source, minimizing heat generation while maintaining optical functionality by modifying polarization and recycling light efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light recycling is used to improve luminous efficiency, then light intensity is improved, but light source temperature increases causing malfunction risk
Solution Approach 1:
The reflector surface is segmented into three distinct zones: a first zone reflecting light from the light source to the polarizing filter, a second zone reflecting light from the polarizing filter back toward the light source, and a third zone reflecting light in directions away from the light source. This segmentation allows selective control of light paths to reduce thermal feedback to the light source while maintaining luminous efficiency.
Solution Approach 2:
Different zones of the reflector are assigned different optical functions based on their local geometry and orientation. The first zone is optimized for initial light direction, the second zone for light recycling, and the third zone for heat management. This local differentiation enables the system to achieve both high light intensity and controlled temperature by optimizing each zone's contribution to the overall system performance.
2Use of energy by moving object
If light recycling is implemented, then luminous efficiency is improved, but device complexity increases due to multiple reflector zones
Solution Approach 1:
The reflector combines multiple optical functions (light direction, light recycling, and heat management) into a single integrated component with zonally differentiated surfaces. This merging approach achieves the benefits of light recycling and temperature control without requiring separate components for each function, thereby limiting the increase in device complexity while improving luminous efficiency.
3Productivity
If light is reflected back towards the light source, then luminous efficiency is improved, but harmful thermal effects are generated
Solution Approach 1:
The reflector is divided into zones with different light reflection behaviors. The second zone reflects light back toward the light source to improve luminous efficiency, while the third zone reflects light in directions away from the light source to reduce thermal heating. This segmentation allows the system to simultaneously achieve high productivity and minimize harmful thermal effects.
Solution Approach 2:
The reflector design changes the spatial distribution and directionality of reflected light by creating distinct zones with different orientations. This parameter change in light reflection geometry allows selective control of which reflected light paths contribute to luminous efficiency versus which paths contribute to thermal heating, thereby improving productivity while reducing harmful thermal effects.
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 design reduces the heating of the light source, allowing for higher light intensity without risking malfunction, while enhancing light efficiency and maintaining effective polarization modification for screen illumination.
Implementation Method 1
a filter illuminated by the light source and designed to transmit a first polarization of the light and to reflect a second polarization of the light
Implementation Method 2
the reflector includes at the flared shape at least a first portion of surface designed to reflect, towards the filter, light rays received (directly) from the light source and at least a second portion of surface designed to reflect, towards the filter, light rays received from the filter after reflection by the filter
Data Source
Figure 1~3
Figure 4~5
AI summary
A device (10) for producing a polarized light beam comprises a light source (6), a reflector (7), and a filter (8) illuminated by the light source (6) and designed to transmit a first polarization of the light and to reflect a second polarization of the light. The reflector (7) comprises at least a first surface portion (P1) designed to reflect, towards the filter (8), light rays (R1) received from the light source (6) and at least a second surface portion (P2) designed to reflect, towards the filter (8), light rays (R4) received from the filter (8) after reflection by the filter (8). An image generation device and a head-up display are also described.