Hybrid LED LD Light Combining Device for Projection Brightness
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Solution Overview
Problem
Conventional light source technologies face challenges in achieving high brightness at a competitive cost, particularly in projection displays, as single light emitting sources like LEDs or semiconductor lasers have limitations in brightness and cost when used alone, and combining them using dichroic filters increases cost and power consumption.
Innovation Solution
A novel light combining method using a geometric manner with a light combining device that guides and combines light beams from two light emitting sources with different brightness and etendue, eliminating the need for a dichroic filter, allowing for higher brightness and reduced cost by optimizing light distribution and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LED array is used, then cost is low, but brightness cannot meet the requirement of mainstream projection display
Solution Approach 1:
The patent combines LED array and LD array in a hybrid configuration, merging the cost advantage of LEDs with the brightness advantage of LDs to achieve both low cost and high brightness for projection display
2Illumination intensity
If LD array is used, then brightness is high enough, but cost is too high
Solution Approach 1:
The patent merges LED array and LD array where LEDs provide the majority of luminous flux at low cost, while LDs supplement brightness, achieving high brightness with reduced cost compared to pure LD array
3Illumination intensity
If lights from LED and LD are combined using dichroic filter, then brightness can be increased, but cost and power consumption increase
Solution Approach 1:
The patent extracts and eliminates the dichroic filter from the optical system by using direct geometric arrangement of LED and LD arrays with appropriate optical elements, reducing cost and power consumption while maintaining brightness enhancement
4Illumination intensity
If lights from LED and LD are combined using dichroic filter, then brightness can be increased, but power consumption increases
Solution Approach 1:
The patent removes the dichroic filter which causes power loss through reflection and absorption, replacing it with a more efficient geometric light combination approach that reduces overall power consumption while maintaining high brightness
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 method achieves a combined light with higher brightness than the lower-brightness source, reducing costs and power consumption while maintaining efficient heat dissipation, suitable for both same and different color lights, and offering color tuning freedom.
Implementation Method 1
A novel light combining method using a geometric manner with a light combining device that guides and combines light beams from two light emitting sources
Data Source
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AI summary
A light source comprises a light combining device for guiding incident light from a first light emitting source (310) and incident light from a second light emitting source (340) with different incident directions to combine two paths of incident light into one path of emission light emitted from a first optical path. The light combining device comprises a guide part (330), for guiding light from the second light emitting source (340) to converge into the first optical path, and hindering a part of light from the first light emitting source (310) from entering the first optical path, the luminous flux of the hindered part of the light being less than the luminous flux of light from the first light emitting source (310) entering the first optical path. This light source can effectively reduce the cost and achieve a better heat dissipation effect and is especially suitable for a projection device