Compensation Light Source for Projection Color Gamut Correction
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Solution Overview
Problem
Existing projection systems suffer from color gamut deviations from required standards due to low light conversion efficiency in wavelength conversion layers, leading to degraded image quality.
Innovation Solution
A compensation light source is introduced to spectrally overlap and adjust the color coordinates of primary light emitted by a color wheel component, allowing independent adjustment of compensation and excited light to align with desired color gamuts, thereby correcting the color gamut of the projection system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wavelength conversion layer is used to convert light from the excitation light source, then the projection system can generate primary light of different colors, but the color coordinates and color gamut deviate from required standards due to low light conversion efficiency
Solution Approach 1:
The patent segments the light conversion function by introducing a compensation light source that operates independently from the main wavelength conversion layer. This allows separate optimization of the primary light generation and color compensation functions, enabling independent adjustment of color coordinates to meet standard requirements while maintaining broad color gamut coverage.
Solution Approach 2:
The patent changes the parameters of the light output by introducing a compensation light source with adjustable intensity and spectral characteristics. By varying the compensation light parameters, the system can dynamically adjust color coordinates to match standard color spaces (DCI, REC.709) while maintaining high luminous efficiency from the original wavelength conversion layer.
2Productivity
If the excitation light source irradiates the color wheel component to produce primary light, then the system achieves high luminous efficiency and small etendue, but the color gamut deviates from required color standards
Solution Approach 1:
The compensation light source acts as an intermediary element between the high-efficiency excitation light source and the final projected image. It mediates the color accuracy issue by adding a controllable light component that compensates for spectral deficiencies without reducing the overall luminous efficiency achieved through the wavelength conversion layer.
3Manufacturing precision
If a compensation light source is added to adjust color coordinates, then the color gamut can be aligned with standard color spaces, but the device complexity increases
Solution Approach 1:
The compensation light source is designed to serve multiple functions: it compensates for color coordinate deviations, adjusts color gamut to match different standards (DCI, REC.709), and can independently control brightness. This multi-functionality justifies the added complexity by providing comprehensive color control capabilities that were previously unachievable.
Solution Approach 2:
The system introduces dynamic control capabilities through the compensation light source, allowing real-time adjustment of color coordinates and gamut. This dynamic adaptability enables the projection system to maintain accurate color reproduction across different operating conditions and content requirements, transforming a static optical system into a dynamically adjustable one.
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 effectively adjusts the color gamut of the projection system to match standard color gamuts like DCI or REC.709, improving image quality by ensuring accurate color coordinates and enhancing brightness.
Implementation Method 1
a blue laser diode excites different wavelength conversion layers and/or scattering layers disposed in a motion direction of a color wheel component to form different primary light
Implementation Method 2
a segmented region provided with a blue light scattering layer
Data Source
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AI summary
A light emitting device comprises: a light source module (101), comprising an excitation light source (111) for emitting exciting light and a compensation light source (112) for emitting compensation light; and a color wheel component (102), comprising at least one segmented region distributed in a motion direction of the color wheel component (102), wherein the color wheel component (102) emits the compensation light and first light that comprises at least one beam of excited light under irradiation of the excitation light source (111) and the compensation light source (112), wherein the compensation light spectrally overlaps the at least one beam of excited light in the first light, and the compensation light and the excited light spectrally overlapping the compensation light are simultaneously emitted and are independently adjustable. A projection system comprising a light emitting device is further provided.