Projection Illumination Light Converging Lens Beam Projection
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Solution Overview
Problem
The fluorescence beam generated by a phosphor layer in projection devices has a larger light spot than the original light beam, making it difficult to effectively project into the light integration rod, which affects uniform luminance and optical efficiency.
Innovation Solution
Incorporating a light converging lens with a clear aperture larger than twice the greatest width of the light spot formed by the conversion beam, allowing the conversion beam to be effectively received and projected into the light integration rod, along with a wavelength conversion element and excitation light source, to enhance beam projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a phosphor layer is used to generate fluorescence beam, then wavelength conversion is achieved, but the light spot size increases making it difficult to project into the light integration rod
Solution Approach 1:
A light converging lens is introduced as an intermediary optical element between the wavelength conversion element and the light integration rod. This lens mediates the transition from the expanded fluorescence beam to the required beam size for the light integration rod, enabling effective light transfer while preserving wavelength conversion functionality.
Solution Approach 2:
The patent changes the optical parameters of the system by introducing a light converging lens with specific focal length and aperture parameters. This allows transformation of the beam characteristics (size, convergence) to match the requirements of the light integration rod, resolving the size mismatch problem.
2Quantity of substance
If the light spot size increases after wavelength conversion, then more light is generated, but optical loss increases due to inability to effectively project into the light integration rod
Solution Approach 1:
By adjusting the parameters of the light converging lens (focal length, aperture diameter), the system optimizes the balance between collecting sufficient fluorescence light and effectively coupling it into the light integration rod, thereby minimizing optical loss while maximizing light output quantity.
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 ensures effective projection of the conversion beam into the light integration rod, reducing optical loss and improving uniformity and efficiency of the illumination system.
Implementation Method 1
an excitation light source configured to provide an excitation beam
Implementation Method 2
a wavelength conversion element disposed on a transmission path of the excitation beam and configured to convert the excitation beam into a conversion beam
Implementation Method 3
a light converging lens disposed on a transmission path of the conversion beam from the wavelength conversion element
Implementation Method 4
a light integration rod disposed on a transmission path of the conversion beam and configured to receive the conversion beam from the light converging lens
Data Source
AI summary
A projection device includes an illumination system, a light valve, and a projection lens. The illumination system includes an excitation light source, a wavelength conversion element, a light converging lens, and a light integration rod. The excitation light source provides an excitation beam. The wavelength conversion element converts the excitation beam into a conversion beam. A greatest width in a light spot formed on the wavelength conversion element by the excitation beam is a first distance. A greatest width in a light spot formed on the wavelength conversion element by the conversion beam is a second distance. The second distance is greater than the first distance. The light integration rod receives the conversion beam from the light converging lens. The conversion beam generated by the wavelength conversion element of the invention is effectively projected to the light integration rod.