Projection Apparatus Multi-Light Valve Illumination System
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Solution Overview
Problem
Existing projection apparatuses face challenges in achieving high brightness and wide color gamut due to the limitations of single light valves and poor conversion efficiency of yellow phosphor, which can lead to increased temperature and reduced image quality.
Innovation Solution
The proposed projection apparatus incorporates an illumination system with a blue light emitting element, a red light emitting element, a wavelength conversion device, a dichroic assembly, and light diffusing elements. This system converts blue light into green light, allowing for higher wavelength conversion efficiency and wider color gamut, while distributing light energy effectively to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single light valve is used to increase image brightness, then the brightness can be improved, but the temperature of the light valve will exceed the normal operating temperature
Solution Approach 1:
The patent divides the light modulation function into multiple light valves (first light valve for red light, second light valve for green and blue light) instead of using a single light valve. This segmentation distributes the light energy across multiple components, preventing any single light valve from overheating while maintaining high image brightness.
Solution Approach 2:
The patent combines multiple light sources (red light emitting element, green light emitting element, blue light emitting element) and multiple light valves into a unified projection system. The dichroic mirror and beam combining optics merge the separate light paths into a single projection path, achieving high brightness while distributing thermal load across multiple components.
2Illumination intensity
If yellow phosphor is used to convert blue light to achieve high brightness, then the brightness can be improved, but the wavelength conversion efficiency is poor
Solution Approach 1:
The patent extracts the green light generation function from the yellow phosphor conversion process. Instead of using blue light excitation of yellow phosphor to produce green light (which has poor efficiency), the system uses a dedicated green light emitting element that directly generates green light, eliminating the inefficient wavelength conversion step while maintaining high brightness.
3Illumination intensity
If yellow phosphor is used to convert blue light, then brightness can be achieved, but the color gamut is limited due to poor red light saturation
Solution Approach 1:
The patent extracts the red light generation from the yellow phosphor conversion process and uses a dedicated red light emitting element. This ensures high saturation red light directly from the source, expanding the color gamut while maintaining the brightness achieved through the multi-source, multi-light valve system.
Solution Approach 2:
The patent employs a composite light source system combining red light emitting element, green light emitting element, and blue light emitting element. This composite approach allows each color to be generated by its optimal source, achieving wide color gamut with high saturation for all primary colors while maintaining high overall brightness.
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 higher brightness, wider color gamut, and maintains normal operating temperature, ensuring good image quality and efficient energy use.
Implementation Method 1
The wavelength conversion area is configured to convert the blue beam into a green 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 diffusing element is disposed between the red light emitting element and the dichroic assembly
Implementation Method 4
The dichroic film is configured to transmit the red beam to the first light valve, and the second light valve is configured to convert the green beam and the blue beam
Data Source
AI summary
A projection apparatus includes an illumination system, a prism assembly, a first light valve, a second light valve and a projection lens. The illumination system includes a blue light emitting element, a red light emitting element, a wavelength conversion device, a dichroic assembly, a first light diffusing element and a second light diffusing element. The second light diffusing element has a diffusion area and a non-diffusion area. The diffusion area is located on a transmission path of a blue beam from the dichroic assembly, and the non-diffusion area is located on a transmission path of a green beam from the dichroic assembly. The prism assembly has a dichroic film. The dichroic film is configured to transmit a red beam to the first light valve. The dichroic film is configured to transmit the green beam and the blue beam to the second light valve.