Projection Illumination System Light Valve Temperature Management
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Solution Overview
Problem
Current projection apparatuses face challenges in achieving high brightness and wide color gamut while maintaining normal operation, as high light energy loading can exceed the operating temperature of light valves, and existing wavelength conversion methods like yellow phosphor have low conversion efficiency and saturation.
Innovation Solution
An illumination system comprising a blue light-emitting element, a red light-emitting element, a wavelength conversion device, a dichroic assembly, and light diffusion elements, where the blue light is converted to green light, and the red and blue lights are managed to reduce excessive light loading on light valves, using a dichroic assembly and diffusion elements to optimize light transmission and energy distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light valve is adopted to convert illumination beam into image light beam, then the structure is simple, but the light energy transmitted on the light valve is excessively high, causing the temperature to exceed normal operating temperature
Solution Approach 1:
The patent divides the light modulation function into two separate light valves: a first light valve for the red light beam and a second light valve for the green light beam. This segmentation reduces the light energy load on each individual light valve, preventing excessive temperature rise while maintaining functional completeness.
Solution Approach 2:
The patent introduces a rotating wheel with wavelength conversion regions that dynamically switches between different wavelength conversion materials (yellow phosphor, green phosphor, red phosphor) in the optical path. This dynamic configuration allows the system to optimize light distribution and prevent overheating by alternating which wavelengths are converted and which pass through directly.
2Illumination intensity
If yellow phosphor is used to convert blue light to generate desired color with high brightness, then the brightness is improved, but the conversion efficiency is relatively adverse and the gamut is limited due to adverse red light saturation
Solution Approach 1:
The patent applies different wavelength conversion materials in different spatial and temporal contexts. Yellow phosphor is used for blue-to-green conversion when high brightness is needed, while green phosphor is used for blue-to-green conversion when higher efficiency is required. Red phosphor is used selectively to enhance red light saturation. This local quality differentiation optimizes both brightness and efficiency depending on the operational requirements.
Solution Approach 2:
The patent changes the parameters of the wavelength conversion process by using multiple phosphor materials with different conversion characteristics. By rotating different phosphor materials into the optical path, the system can adjust the conversion efficiency and color output parameters dynamically, achieving both high brightness and high efficiency at different times.
3Loss of energy
If multiple wavelength conversion regions are used to improve conversion efficiency and brightness, then the wavelength conversion efficiency and brightness are improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple wavelength conversion regions (yellow phosphor, green phosphor, red phosphor) onto a single rotating wheel structure. This merging approach allows the system to achieve high conversion efficiency and brightness through multiple phosphors while containing the mechanical complexity within a single rotating component rather than requiring separate mechanisms for each phosphor.
Solution Approach 2:
The rotating wheel serves multiple functions: it acts as a mechanical switch for selecting different wavelength conversion materials, a beam splitter for directing different wavelengths to different light valves, and a timing mechanism for coordinating the operation of multiple phosphors. This multi-functionality reduces the need for additional separate components.
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 achieves high wavelength conversion efficiency, high brightness, and a wide color gamut, preventing excessive temperature rise and ensuring normal operation with good image quality by effectively managing light energy through the described optical system.
Implementation Method 1
The wavelength conversion region is configured to convert the blue light beam into a green light beam
Implementation Method 2
The dichroic assembly is disposed between the blue light-emitting element and the wavelength conversion device
Implementation Method 3
The first light diffusion element is disposed between the red light-emitting element and the dichroic assembly. The second light diffusion element is disposed on transmission paths of the blue light beam, the red light beam, and the green light beam
Data Source
AI summary
An illumination system and a projection apparatus are provided. The illumination system includes a blue light-emitting element, a red light-emitting element, a wavelength conversion device, a dichroic assembly, a first light diffusion element, and a second light diffusion element. The wavelength conversion device includes a reflective region and a wavelength conversion region. The wavelength conversion region is configured to convert a blue light beam emitted by the blue light-emitting element into a green light beam. The dichroic assembly is disposed between the blue light-emitting element and the wavelength conversion device. The first light diffusion element is disposed between the red light-emitting element and the dichroic assembly.The second light diffusion element has a diffusion region and a non-diffusion region. The diffusion region is located on a transmission path of the blue light beam. The non-diffusion region is located on a transmission path of the green light beam.