If the light source itself has the ability to produce RGB primary colors separately, such as a tri-color LED light source, then it consists of three independent LED light emitting units, so the color wheel is no longer needed.
If the light source is a large monochromatic bulb, it must be passed through a color wheel or beamsplitter prism to produce the RGB primary colors.
Laser classification is complex.
1.In the case of a three-color laser, there is no need for a color wheel.
2.However, if it is a monochromatic laser, it is necessary to separate the light of the three primary colors through a color wheel or a beamsplitting prism.
For ALPD30 technology (two-color laser with phosphor luminescence), red and blue lasers can be output directly, while phosphor luminescence needs to go through a layer of "dyeing" after luminescence, the specific solution may be different, but there will be this process.
In the choice of light source, the three-color laser is undoubtedly the best choice, but due to its high cost, the current consumer-grade projector does not use the three-color laser.
For cost reasons, LEDs have become a good choice.
Why?
An important reason is that LEDs don't need color wheels.
The high-speed rotation of the color wheel creates noise. If the speed is too low, there will be a rainbow screen effect; And if the speed is too high, it is relatively difficult to ensure silence.
The color wheel takes up a lot of space and is often used in conjunction with ultra-high-pressure mercury lamps, which themselves are very large.
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