Laser Displays Using Phosphor Screens Emitting Visible Colored Light
First Claim
Patent Images
1. A display system, comprising:
- a screen that comprises a substrate and parallel phosphor stripes formed on the substrate, wherein adjacent phosphor stripes are made of different phosphors that emit colored light of different colors by absorbing light at an excitation wavelength;
a laser module to project and scan a laser beam at the excitation wavelength onto the screen to convert an image carried by the laser beam via an optical modulation into a color image produced by the phosphor stripes on the screen;
an optical sensor module positioned to receive and detect colored light emitted from the phosphor stripes as a result of absorbing light at the excitation wavelength;
a feedback mechanism that directs an electrical output of the optical sensor unit to the laser module; and
an alignment control mechanism in the laser module to respond to alignment information containing in the electrical output of the optical sensor module and to control a timing of image data modulated on the laser beam to correct an alignment of the laser beam with respect to the phosphor stripes.
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Abstract
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.
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Citations
17 Claims
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1. A display system, comprising:
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a screen that comprises a substrate and parallel phosphor stripes formed on the substrate, wherein adjacent phosphor stripes are made of different phosphors that emit colored light of different colors by absorbing light at an excitation wavelength; a laser module to project and scan a laser beam at the excitation wavelength onto the screen to convert an image carried by the laser beam via an optical modulation into a color image produced by the phosphor stripes on the screen; an optical sensor module positioned to receive and detect colored light emitted from the phosphor stripes as a result of absorbing light at the excitation wavelength; a feedback mechanism that directs an electrical output of the optical sensor unit to the laser module; and an alignment control mechanism in the laser module to respond to alignment information containing in the electrical output of the optical sensor module and to control a timing of image data modulated on the laser beam to correct an alignment of the laser beam with respect to the phosphor stripes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for displaying images on a screen, comprising:
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providing a screen that comprises a substrate on which parallel phosphor stripes are formed and adjacent phosphor stripes are made of different phosphors that emit colored light of different colors by absorbing light at an excitation wavelength; scanning at least one laser beam at the excitation wavelength onto the screen to convert an image carried by the laser beam via an optical modulation into a color image produced by the phosphor stripes on the screen; using an optical sensor module to receive and detect colored light emitted from the phosphor stripes to produce an electrical sensor signal containing alignment information of the laser beam on the screen; and using the alignment information in the electrical sensor signal to control either a timing of image data modulated on the laser beam or a direction of the laser beam projected onto the screen to correct an alignment of the laser beam with respect to the phosphor stripes. - View Dependent Claims (12, 13, 14)
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15. A display system, comprising:
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a screen comprising a substrate and parallel phosphor stripes on the substrate, wherein two adjacent phosphor stripes are made of different phosphors that emit colored light of different colors by absorbing light at an excitation wavelength; and a laser module to project and scan a laser beam at the excitation wavelength onto the screen to convert an image carried by the laser beam via an optical modulation into a color image produced by colored light emitted by the phosphor stripes on the screen, the laser module comprising a mechanism to monitor image data bits to be modulated on the laser beam to produce a black pixel monitor signal;
a diode laser to produce the laser beam; and
a laser control coupled to receive the black pixel monitor signal and to (1) operate the diode laser at a driving current below a laser threshold current without turning off the driving current to produce a low light output representing a virtual black color on the screen when the black pixel monitor signal indicates a display time of a block of contiguous black pixels is less than a response delay time of the diode laser and (2) turn off the driving current to produce a true black color on the screen when the black pixel monitor signal indicates a display time of a block of contiguous black pixels is greater than the response delay time of the diode laser. - View Dependent Claims (16, 17)
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Specification