Illumination Device for HDR Projectors Using Polarization Multiplexing
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Solution Overview
Problem
Existing HDR projectors face challenges in aligning SDR and HDR illumination light polarization, especially when using a liquid crystal panel as the luminance modulation panel, which affects the intensity distribution and efficiency of the illumination.
Innovation Solution
The proposed solution involves an illumination device and display apparatus that include a first light source for phase-modulated HDR illumination, a second light source for SDR illumination, an integrator optical system, a polarization conversion element, and a reflection element to multiplex and align the polarization of both illumination lights, ensuring desired intensity distribution without disturbing the phase modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a DMD is used as a luminance modulation panel to achieve HDR illumination, then HDR illumination light with desired intensity distribution can be obtained, but SDR and HDR illumination light are not aligned in polarization making it difficult to apply with liquid crystal panels
Solution Approach 1:
A polarization conversion element is introduced as an intermediary component between the illumination light source and the liquid crystal panel. This element converts the polarization states of both SDR and HDR illumination light to align with the liquid crystal panel's requirements, enabling compatibility without changing the panel type or illumination source.
Solution Approach 2:
The polarization state parameter of the illumination light is changed through the polarization conversion element. By adjusting and unifying the polarization parameters of SDR and HDR light, the system achieves compatibility with liquid crystal panels while maintaining HDR functionality.
2Manufacturing precision
If phase modulation is applied to achieve desired intensity distribution, then HDR illumination is achieved, but polarization alignment with SDR light becomes difficult
Solution Approach 1:
The polarization conversion element serves as a mediator that receives both phase-modulated HDR light and SDR light, and outputs both with aligned polarization states. This intermediary component resolves the conflict between maintaining phase modulation precision and achieving polarization stability.
3Illumination intensity
If multiple illumination lights are combined, then desired intensity distribution is achieved, but chromaticity shifts may occur
Solution Approach 1:
The polarization conversion element acts as an intermediary that processes both SDR and HDR illumination lights together, ensuring they maintain consistent chromaticity properties while achieving the desired combined intensity distribution.
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 allows for efficient multiplexing of SDR and HDR illumination lights, preventing chromaticity shifts and maintaining high efficiency, enabling the use of a liquid crystal panel for luminance modulation and enhancing the maximum luminance expressible by the projector.
Implementation Method 1
a polarization conversion element that aligns polarization directions of incident light in one polarization direction
Implementation Method 2
a reflection element disposed on an optical path between the integrator optical system and the polarization conversion element, the reflection element multiplexing the first illumination light and the second illumination light
Implementation Method 3
a first light source that outputs first illumination light subjected to phase modulation to have desired intensity distribution
Data Source
AI summary
An illumination device according to the present disclosure includes a first light source that outputs first illumination light subjected to phase modulation to have desired intensity distribution, a second light source that outputs second illumination light; an integrator optical system that uniformizes intensity distribution of the second illumination light, a polarization conversion element that aligns polarization directions of incident light in one polarization direction, and a reflection element disposed on an optical path between the integrator optical system and the polarization conversion element. The reflection element multiplexes the first illumination light and the second illumination light and causes each of the first illumination light and the second illumination light to enter the polarization conversion element.