Projection Lighting White Light Generation via RGB LED Segmentation
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Solution Overview
Problem
Conventional projection systems are inefficient as they generate excessive heat and waste light due to the use of bright white light sources, which are not optimized for red, green, and blue components, leading to suboptimal color gamut and energy usage.
Innovation Solution
A projection system utilizing high-power red, green, and blue LEDs, with a color wheel to filter and combine light sources, and a spatial light modulator to control the duty cycles of the LEDs, creating a more efficient and bright white light for full-color imaging and lighting applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If bright white light sources are used for projection, then illumination intensity is improved, but temperature increases and energy efficiency deteriorates
Solution Approach 1:
The invention segments the white light generation process into three separate LED light sources emitting red, green, and blue wavelengths. Each LED operates independently at optimized current levels, avoiding the excessive heat generation of single high-power white light sources while maintaining high illumination intensity through additive color mixing.
Solution Approach 2:
The invention changes the operational parameters by using three separate LED sources with independently controllable current levels rather than a single white light source. This allows optimization of each LED's operating point for maximum efficiency while achieving the required total illumination intensity through combination.
2Illumination intensity
If bright white light sources are used for projection, then illumination intensity is improved, but energy efficiency deteriorates
Solution Approach 1:
The invention segments the white light generation into three separate LED sources (red, green, blue) that can be independently controlled. This segmentation allows each LED to operate at its peak efficiency point, converting electrical energy to light more effectively than a single white light source, thereby improving overall energy efficiency while maintaining high illumination intensity.
Solution Approach 2:
The invention changes the energy conversion parameters by using three separate LED sources with independently adjustable current levels. This enables optimization of the electrical-to-optical conversion efficiency for each wavelength, reducing wasted energy while achieving the required total illumination intensity for projection.
3Illumination intensity
If conventional white light sources are used, then illumination intensity is improved, but color gamut deteriorates
Solution Approach 1:
The invention segments the light source into three separate LEDs emitting at specific red, green, and blue wavelengths. This segmentation provides precise control over the spectral composition, enabling accurate color mixing and expanded color gamut while maintaining high illumination intensity through additive combination of the three primary colors.
Solution Approach 2:
The invention changes the spectral parameters by using three separate LED sources with independently controllable intensity levels. This allows precise adjustment of the red, green, and blue components to achieve accurate color rendering and expanded color gamut, overcoming the spectral limitations of conventional white light sources.
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 high brightness and efficiency by using LEDs to generate only the necessary red, green, and blue light, reducing heat and energy waste, while providing a high color rendering index for improved color accuracy and brightness in projection and lighting applications.
Implementation Method 1
A projection system utilizing high-power red, green, and blue LEDs
Implementation Method 2
with a color wheel to filter and combine light sources
Implementation Method 3
filter and combine light sources, and a spatial light modulator to control the duty cycles
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 3~4
AI summary
The invention provides a full color projection system (1000) comprising a lighting system (100) configured to provide first light (111) including blue light, second light (121) including one or more of green and yellow light, third light (131) including red light, wherein the first light (111), the second light (121), and the third light (131) include light having a wavelength of 430 nm or larger; a further light source (140) configured to provide further light source light (141) including one or more of UV light and short wavelength blue light having a wavelength of 420 nm or smaller, wherein the first light (111), second light (121), third light (131) and the further light source light (141) have mutually differing spectral power distributions; a spatial light modulator system (200) configured to receive the first light (111), the second light (121), the third light (131), and the further light source light (141), wherein the spatial light modulator system (200) is configured to provide a plurality of pixels (210) for providing projection system light (1001) with one or more of the first light (111), the second light (121), and the third light (131), and in one or more control modes the further light source light (141); and a control system (300) configured to control the lighting system (100), the further light source (140), and the spatial light modulator system (200), wherein during operation one or more pixels (210) are temporarily configured to provide white projection system light (1001), and wherein the projection system (1000) is configured to provide also the further light source light (141) via one or more of those one or more pixels (210).