Optical Power Shifter for Balanced Projection Spectrum
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Solution Overview
Problem
Traditional light sources, such as those using yellow phosphors excited by blue lasers, often produce light beams with imbalances in color gamut, leading to wasted power and heat, which degrades energy efficiency in projection systems.
Innovation Solution
A system comprising a separator, an optical power shifter using quantum dots, and a combiner to split and shift excess light wavelengths, converting them to achieve a balanced output spectrum, thereby utilizing previously wasted energy to enhance color balance without external red light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If yellow phosphor is excited by blue laser to generate light beam, then yellow and green light output is improved, but red light deficiency occurs and energy efficiency deteriorates
Solution Approach 1:
The light beam is segmented into retained light beam (useful wavelengths) and excess light beam (yellow/green wavelengths that would be wasted). The separator divides the input light beam based on wavelength, directing excess light to the optical power shifter for conversion to red light, while retaining useful light for direct use. This segmentation allows selective processing of different wavelength components to optimize overall energy efficiency.
Solution Approach 2:
The optical power shifter changes the wavelength parameter of excess light by converting yellow/green wavelengths to red wavelengths through quantum dot fluorescence. This parameter transformation converts previously unusable excess light into valuable red light, directly addressing the red light deficiency while improving energy efficiency by utilizing all generated light.
2Device complexity
If traditional light sources are used with imbalanced color gamut, then device complexity is reduced, but heat generation increases and energy efficiency deteriorates
Solution Approach 1:
The excess light beam, which would normally be wasted and converted to harmful heat, is instead converted into beneficial red light through the optical power shifter. The quantum dots absorb the excess yellow/green light and re-emit it as red light, transforming a harmful waste product into a useful resource that improves color balance and reduces heat generation.
3Illumination intensity
If quantum dots are used to emit red light, then red light output is improved, but incident power level requirement increases beyond projection application needs
Solution Approach 1:
Instead of directing the full input light beam to the quantum dots, the system extracts only the excess light beam component (yellow/green wavelengths) and directs it to the optical power shifter. This selective extraction ensures that the quantum dots receive only the necessary incident power to convert excess light into red light, avoiding the excessive power requirements that would result from processing the entire light beam.
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 system effectively converts excess light into usable red wavelengths, optimizing energy efficiency by minimizing waste and eliminating the need for additional cooling, resulting in a balanced output spectrum suitable for projection applications.
Implementation Method 1
a separator configured to separate an input light beam, from light source, into a retained light beam directed along a first path and an excess light beam directed along a second path, based on wavelength of input light beam
Implementation Method 2
an optical power shifter positioned to intercept excess light beam and configured to convert excess light beam into a power-shifted light beam comprising at least some wavelengths red-shifted relative to excess light beam
Implementation Method 3
a combiner positioned to intercept both retained light beam and power-shifted light beam, and configured to combine retained light beam and power-shifted light beam onto a common path
Data Source
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AI summary
A system for producing an output light beam of a given spectrum is provided. The system comprises: a light source; a separator configured to separate an input light beam, from the light source, into a retained light beam directed along a first path and an excess light beam directed along a second path, based on wavelength of the input light beam; an optical power shifter positioned to intercept the excess light beam, the optical power shifter configured to convert the excess light beam into a power -shifted light beam comprising at least some wavelengths and/or power red-shifted relative to the excess light beam; and a combiner positioned to intercept both the retained light beam and the power-shifted light beam, the combiner configured to combine the retained light beam and the power-shifted light beam onto a common path to produce the output light beam.