Laser Displays Based On Color Mixing Between Colored Light And Phosphor-Emitted Visible Colored Light
Laser display systems using at least one scanning laser beam to excite one or more fluorescent materials on a screen which emit light to form images. The fluorescent materials may include phosphor materials.
1 . A display system, comprising:
first, second, and third laser display modules to produce first, second and third monochromatic image components of a final image in first, second, and third different colors, respectively, and to project the first, second and third monochromatic image components on a display screen to produce the final image,
wherein the first laser display module comprises: (1) a first screen comprising a first phosphor to absorb light at an excitation wavelength to emit light at a first wavelength different from the excitation wavelength; (2) a first laser module to project and scan at least one laser beam at the excitation wavelength onto the first screen to convert an image in the first color carried by the laser beam into the first monochromatic image component produced by the first phosphor on the first screen; and (3) a first projection optical unit to project the first monochromatic image component from the first screen to the display screen.
2 . The system as in claim 1 , wherein:
the third laser display module comprises: (1) a third screen which does not have a phosphor to emit light; (2) a third laser module to project and scan at least one laser beam of the third color onto the third screen to directly produce the third monochromatic image component on the third screen; and (3) a third projection optical unit to project the third monochromatic image component from the third screen to the display screen.
3 . The system as in claim 1 , wherein:
the third laser display module directly projects and scans at least one laser beam of the third color onto the display screen to directly produce the third monochromatic image component on the display screen which mixes with the first and second monochromatic image components on the screen to form the final image.
4 . The system as in claim 3 , wherein:
the third color is red.
5 . The system as in claim 3 , wherein:
the third color is blue.
6 . The system as in claim 1 , wherein:
the first color is green.
7 . The system as in claim 1 , wherein:
the second laser display module comprises: (1) a second screen comprising a second phosphor to absorb light at an excitation wavelength to emit light at a second wavelength different from the excitation wavelength; (2) a second laser module to project and scan at least one laser beam at the excitation wavelength onto the second screen to convert an image in the second color carried by the laser beam into the second monochromatic image component produced by the second phosphor on the second screen; and (3) a second projection optical unit to project the second monochromatic image component from the second screen to the display screen.
8 . The system as in claim 7 , wherein:
the third laser display module comprises: (1) a third screen comprising a second phosphor to absorb light at an excitation wavelength to emit light at a third wavelength different from the excitation wavelength; (2) a third laser module to project and scan at least one laser beam at the excitation wavelength onto the third screen to convert an image in the third color carried by the laser beam into the third monochromatic image component produced by the second phosphor on the third screen; and (3) a third projection optical unit to project the third monochromatic image component from the third screen to the display screen.
9 . The system as in claim 7 , wherein:
the third laser display module directly projects and scans at least one laser beam of the third color onto the display screen to directly produce the third monochromatic image component on the display screen which mixes with the first and second monochromatic image components on the screen to form the final image.
10 . The system as in claim 9 , wherein:
the third color is red, the first color is green and the second color is blue.
11 . The system as in claim 1 , wherein:
the second laser display module directly projects and scans at least one laser beam of the second color onto the display screen to directly produce the second monochromatic image component on the display screen which mixes with the first and third monochromatic image components on the screen to form the final image; and
the third laser display module directly projects and scans at least one laser beam of the third color onto the display screen to directly produce the third monochromatic image component on the display screen which mixes with the first and second monochromatic image components on the screen to form the final image.
12 . The system as in claim 11 , wherein:
the first color is green, the second color is red and the third color is blue.
13 . A method for mixing different monochromatic image components on a display screen to form colored images, comprising:
using a first laser display module to produce a first monochromatic image component in a first color and to project the first monochromatic image component of a final image through a space onto a display screen, the first laser display comprising: (1) a first screen that is spaced from the display screen and comprises a first phosphor to absorb light at an excitation wavelength to emit light at a first wavelength different from the excitation wavelength; (2) a first laser module to project and scan at least one laser beam at the excitation wavelength onto the first screen to convert an image in the first color carried by the laser beam into the first monochromatic image component produced by the first phosphor on the first screen; and (3) a first projection optical unit to project the first monochromatic image component from the first screen to the display screen;
using second and third laser display modules to produce second and third monochromatic image components of the final image in second, and third colors, respectively, and to project the second and third monochromatic image components onto the display screen to mix with the first monochromatic image component to produce the final image on the display screen.
14 . The method as in claim 13 , wherein:
the second monochromatic image component is directly projected onto the display screen by scanning at least one laser beam of the second color onto the display screen to directly produce the second monochromatic image component on the display screen which mixes with the first and third monochromatic image components on the screen to form the final image.
15 . The method as in claim 13 , wherein:
the second color is red, and
the first and third colors are green and blue, respectively.