LED Light Source Using Wavelength and Geometric Combination
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Solution Overview
Problem
Conventional solid state lighting devices, such as LED light sources, face limitations in achieving high brightness while maintaining RGBW color illumination due to the etendue constraint, which prevents effective combination of light beams with large spectral overlap.
Innovation Solution
A light source comprising an original light emitting device group and a supplementary light emitting device group, where the original group uses wavelength-based light combination and the supplementary group uses geometric-based light combination, allowing for the integration of light beams with significant spectral overlap, thereby reducing the overall etendue and increasing brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple LED chips are arranged closely to achieve RGBW color illumination, then color gamut and color saturation are improved, but etendue increases and brightness decreases
Solution Approach 1:
The patent segments the light combining process into two distinct stages: wavelength-based combination for LEDs with small spectral overlap (R, G, B LEDs) and geometric-based combination for LEDs with large spectral overlap (white LED with color LEDs). This segmentation allows each combination method to operate in its optimal performance range, resolving the contradiction between color gamut and brightness.
Solution Approach 2:
The patent changes the combination parameter from a single method to a dual-method approach. For LEDs with small spectral overlap, wavelength-based combination is used; for LEDs with large spectral overlap, geometric-based combination is used. This parameter change enables the system to maintain low etendue while achieving RGBW color illumination and high brightness.
2Illumination intensity
If wavelength-based light combination is used to combine LED beams, then etendue is reduced, but LEDs with large spectral overlap cannot be effectively combined
Solution Approach 1:
The patent introduces dynamic selection of combination methods based on the spectral overlap characteristics of the LEDs. The system adaptively switches between wavelength-based and geometric-based combination approaches, allowing flexible handling of different LED types (R, G, B, and white LEDs) with varying spectral properties.
Solution Approach 2:
The patent introduces geometric-based combination as an intermediary method to bridge the gap left by wavelength-based combination. While wavelength-based combination handles LEDs with small spectral overlap, geometric-based combination serves as an intermediary solution for combining LEDs with large spectral overlap, particularly white LED with color LEDs.
3Illumination intensity
If geometric-based light combination is used to combine light beams, then brightness is improved, but etendue increases
Solution Approach 1:
The patent applies local quality by using geometric-based combination selectively only for the white LED and color LED combination where spectral overlap is large, rather than applying it universally. This localized application minimizes the etendue increase while maximizing the brightness benefit where it is most needed.
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 approach enables the combination of light beams with large spectral overlap, reducing the etendue of the entire light source and enhancing brightness, while maintaining RGBW color illumination.
Implementation Method 1
the wavelength-based light combining device combines the light output from all the LEDs in the original light emitting device group using wavelength-based light combination
Implementation Method 2
the geometric-based light combining device combines the light finally output from the original light emitting device group and the light finally output from the supplementary light emitting device group into one beam of light using geometric-based light combination
Implementation Method 3
A solid state lighting device, including LED (Light Emitting Diode) and LD (Laser Diode), is a solid state semiconductor device which can directly convert electrical power into visible light
Implementation Method 4
The working mechanism of a phosphor-covered LED is to coat phosphor onto the surface of LED chip in order to emit fluorescent light from the phosphor which is excited by the LED light
Data Source
AI summary
Disclosed are a light source and a display system. The light source comprises at least one original light emitting device group (1) and at least one supplementary light emitting device group (2). The original light emitting device group (1) comprises at least two LED (11, 12, 13) and a wavelength light combining device (14, 15), wherein the energy of the overlapped spectrum in the normalized spectrum of the two LED is smaller than 50% of the smaller energy of the two, and the wavelength light combining device combines the light output from all the LED in the original light emitting device group (1) in a wavelength light combining way. The supplementary light emitting device group (2) comprises at least one LED (21). The energy of the overlapped spectrum in the normalized spectrum of any LED of the supplementary light emitting device group (2) and at least one LED of the original light emitting device group (1) is larger than or equal to 10% of the smaller energy of the two. The light source also comprises a geometric light combining device (31), which combines the light finally output from the original light emitting device group (1) and the light finally output from the supplementary light emitting device group (2) into one beam of light in a geometric light combining way.