Projection System Yellow Light Filtering for DCI-P3 Gamut
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Solution Overview
Problem
Traditional mini projectors using light-emitting diodes with primary colors red, green, and blue struggle to achieve a wide color gamut due to excessive yellow light energy, which affects the color coordinate output and fails to meet the DCI-P3 color gamut standard.
Innovation Solution
A projection system with a light-adjusting diaphragm element that filters out specific wavelength ranges, allowing only the desired wavelength band to pass through, thereby purifying the image light and improving color performance by blocking excessive yellow light energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a light-emitting diode with three primary colors (red, green, blue) is used as a light source, then the projector can be miniaturized and achieve high brightness, but the color gamut becomes limited and yellow light energy is excessive
Solution Approach 1:
The patent extracts and removes the harmful yellow light component (wavelength range 560-580nm) from the broadband light spectrum using a specifically designed filter. This filter is positioned in the optical path between the light source and imaging lens, selectively blocking yellow light while allowing other wavelengths to pass through, thereby resolving the color gamut limitation caused by excessive yellow light energy in mini projector LED sources
Solution Approach 2:
The patent changes the spectral parameter of the light source by introducing a filter with specific wavelength transmission characteristics. The filter has a transmission curve that blocks the 560-580nm yellow light range while maintaining transmission in other regions, effectively modifying the light spectrum to achieve DCI-P3 wide color gamut compliance without changing the original LED light source
2Illumination intensity
If yellow light energy is high in the light source, then the overall light output is sufficient, but the color coordinate position is affected and color performance deteriorates
Solution Approach 1:
The patent converts the harmful effect of excessive yellow light into a beneficial filtering process. By deliberately placing a filter that blocks yellow light in the optical path, the system transforms the problematic yellow light component into a controlled parameter, allowing the remaining spectrum to produce accurate color coordinates that meet DCI-P3 standards while maintaining sufficient overall illumination intensity
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 achieves improved color performance and meets the wide color gamut demand of the DCI-P3 standard by filtering out yellow light, resulting in more accurate and vibrant color output.
Implementation Method 1
a filter is disposed in the opening, wherein a part of the first light is blocked by the light shielding area, a wavelength band corresponding to the first dominant wavelength range of other part of the first light passes through the opening, and a wavelength band corresponding to the second dominant wavelength range of other part of the first light is blocked by the filter
Data Source
AI summary
A projection system includes a light source, a projection lens, and a light-adjusting diaphragm element. The light source emits a first light having a first dominant wavelength range and a second dominant wavelength range. The projection lens is disposed on the path of the first light. The light-adjusting diaphragm element, disposed between the light source and the projection lens, has an opening and a light shielding area outside the opening, a filter is disposed in the opening, wherein a part of the first light is blocked by the light shielding area, a wavelength band corresponding to the first dominant wavelength range of other part of the first light passes through the opening, and a wavelength band corresponding to the second dominant wavelength range of the other part of the first light is blocked by the filter to become a second light having a narrow wavelength range.