Hybrid Projector Light Source Layout for Brightness and Color Uniformity
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Solution Overview
Problem
Projector apparatuses face challenges with lamp-based light sources having short lifespans and high replacement costs, LED sources offering lower brightness, and laser diodes increasing product size and manufacturing costs, while using both leads to brightness and color inconsistencies.
Innovation Solution
A hybrid optical system combining LEDs and laser diodes as light sources, utilizing specific wavelength dichroic mirrors and phosphors to optimize brightness and color uniformity, with LEDs positioned closer to the lens and laser diodes further away to minimize size and brightness differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a lamp is used as a light source, then high brightness can be achieved, but the life of the lamp is short and components need to be frequently replaced
Solution Approach 1:
The patent segments the light source system into multiple LED chips with different wavelengths (red, green, blue) to replace the single lamp system. This allows the system to achieve high brightness through combined output while maintaining the long lifespan of LED components, resolving the contradiction between brightness and durability.
2Device complexity
If LED is used as a light source, then component size and manufacturing cost are reduced, but the overall brightness of the output image is lowered
Solution Approach 1:
The patent merges multiple LED light sources with different wavelengths (red LED at 630-680nm, green LED at 520-560nm, blue LED at 450-490nm) into a single hybrid optical system. This combination achieves high overall brightness comparable to traditional lamps while maintaining the compact size and low cost advantages of LED technology.
3Illumination intensity
If laser diode is used as a light source, then the brightness of the output image is high, but the product size increases and the manufacturing cost increases
Solution Approach 1:
The patent segments the high-brightness requirement into three separate LED light sources with different wavelengths, each contributing to specific color channels. This segmentation allows the system to achieve high overall brightness through combined output while avoiding the size and cost penalties of using laser diodes for all color channels.
4Productivity
If both LED and laser diode are used as light sources, then advantages of both can be maximized, but brightness and color inconsistencies occur
Solution Approach 1:
The patent applies local quality by assigning specific wavelength ranges to specific LED types (red: 630-680nm, green: 520-560nm, blue: 450-490nm) and using dichroic mirrors to selectively direct each wavelength to its designated color channel. This localized optimization ensures consistent brightness and color reproduction across all channels while maintaining the performance benefits of hybrid LED technology.
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 hybrid system maximizes the advantages of both LED and laser diode light sources, reducing component count, simplifying internal configuration, and minimizing brightness and color discrepancies, thus enhancing overall performance and reducing product size.
Implementation Method 1
a green phosphor that converts the fourth light into a fifth light
Implementation Method 2
a first dichroic mirror reflecting the first light; a second dichroic mirror reflecting the second light; and a third dichroic mirror reflecting the third light and the fourth light
Data Source
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AI summary
The present disclosure relates to an optical system composed of a hybrid light source, and the optical system includes a first red light emitting diode (LED) emitting a first light of a first wavelength; a second red LED emitting a second light of a second wavelength; a blue LED emitting a third light of a third wavelength; a blue laser diode emitting a fourth light of the third wavelength; and a green phosphor converting the fourth light into a fifth light of a fourth wavelength, in which the first light, the second light, the third light, and the fifth light are emitted in a first direction.