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US 7,791,561 B2Granted
Display systems having screens with optical fluorescent materials
AssigneePrysm, Inc.
InventorsRoger A. Hajjar, David Kent, Phillip H. Malyak
Life of this patent
Estimating the term…
Abstract
Fluorescent screens and display systems and devices based on such screens using at least one excitation optical beam to excite one or more fluorescent materials on a screen which emit light to form images. The fluorescent materials may include phosphor materials and non-phosphor materials such as quantum dots. A screen may include a multi-layer dichroic layer.
Claims29
A display system, comprising:
- a screen comprising a substrate on which a plurality of parallel fluorescent stripes are formed, wherein adjacent fluorescent stripes are made of different fluorescent materials that absorb light at an excitation wavelength to emit light of different colors, respectively;
- and
- an optical module to project and scan one or more excitation optical beams at the excitation wavelength onto the screen to convert an image carried by the one or more excitation optical beams via an optical modulation into an image produced by emitted light from the parallel fluorescent stripes on the screen, wherein the optical module comprises a modulation control which controls the optical modulation of each excitation optical beam to produce image grey scales,
- wherein the optical module comprises:
- a mechanism to monitor image data bits to be modulated on an excitation optical beam to produce a black pixel monitor signal that indicates black pixels in image data bits;
- at least a diode laser to produce a laser beam as the excitation optical beam;
- and
- a laser control coupled to receive the black pixel monitor signal and to 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 black color on the screen when the black pixel monitor signal indicates a length of black pixels is less than a response delay time of the diode laser and turn off the driving current to produce a true black color on the screen when the black pixel monitor signal indicates a length of black pixels is greater than the response delay time of the diode laser.
5 more elements
A method for displaying images, comprising:
- producing excitation light from a diode laser at an excitation wavelength that optically excites fluorescent materials to cause the fluorescent materials to emit colored light;
- applying both a pulse code modulation and a pulse width modulation to modulate a beam of the excitation light to carry images with image grey scales in form of sequential optical pulses in the beam of the excitation light that carry image data of an image in different colors;
- scanning the modulated beam of the excitation light onto a screen comprising a substrate on which a plurality of parallel fluorescent stripes are formed from the fluorescent materials to produce images on the screen with the emitted colored light, wherein at least three adjacent fluorescent stripes are made of three different fluorescent materials:
- a first fluorescent material to absorb light at an excitation wavelength to emit light of a first color, a second fluorescent material to absorb light at the excitation wavelength to emit light of a second color, and a third fluorescent material to absorb light at the excitation wavelength to emit light of a third color;
- monitoring image data bits to be modulated on the excitation light to produce a black pixel monitor signal that indicates black pixels in image data bits;
- in response to the black pixel monitor signal, operating 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 black color on the screen when the black pixel monitor signal indicates a length of black pixels is less than a response delay time of the diode laser;
- and
- in response to the black pixel monitor signal, operating the diode laser to turn off the driving current to produce a true black color on the screen when the black pixel monitor signal indicates a length of black pixels is greater than the response delay time of the diode laser.
5 more elements
Dependencies are inferred from the claim text.