Full color upconversion display
First Claim
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1. A full color upconversion display, comprising:
- an upconversion screen, comprising a host material and one or more rare earth ion dopant materials, said one or more dopant materials being responsive to incident infrared radiation such that the upconverting screen emits visible light of a selected red, green or blue color when excited by infrared radiation of appropriate wavelength and intensity;
means for exciting said upconversion screen in a spatially selective manner so as to define a particular color image by excitation at a desired image pixel location with infrared radiation of suitable wavelength and intensity so as to emit visible light of a desired color.
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Abstract
Full color alphanumeric or image displays are produced by upconverting near infrared radiation into visible light. The display system includes an upconverting screen including a host material doped with rare earth ions. The screen may be divided into pixels which may be slectively excited by infrared radiation to emit visible light of a desired color. An intensity-modulated infrared laser beam is scanned across the surface of the screen to selectively excite the screen pixels and produce the desired image.
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Citations
14 Claims
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1. A full color upconversion display, comprising:
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an upconversion screen, comprising a host material and one or more rare earth ion dopant materials, said one or more dopant materials being responsive to incident infrared radiation such that the upconverting screen emits visible light of a selected red, green or blue color when excited by infrared radiation of appropriate wavelength and intensity; means for exciting said upconversion screen in a spatially selective manner so as to define a particular color image by excitation at a desired image pixel location with infrared radiation of suitable wavelength and intensity so as to emit visible light of a desired color. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An upconversion screen responsive to infrared laser excitation energy to emit red-green-blue color visible display light, comprising:
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a host material transparent to the excitation energy and to visible light; and rare earth ion material, doping said host material in suitable concentrations so as to respond to excitation energy of appropriate infrared wavelength and intensity to upconvert the exciting energy into red, green and/or blue visible display light. - View Dependent Claims (12, 13, 14)
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Specification