IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0877069
(2010-09-07)
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| 등록번호 |
US-8698713
(2014-04-15)
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발명자
/ 주소 |
- Hajjar, Roger A.
- Kent, David
- Malyak, Phillip H.
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| 출원인 / 주소 |
|
| 대리인 / 주소 |
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| 인용정보 |
피인용 횟수 :
4 인용 특허 :
134 |
초록
▼
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 qu
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.
대표청구항
▼
1. A display system, comprising: a screen including a substrate on which a plurality of parallel fluorescent stripes are formed to be along a first direction and spaced from one another along a second direction distinct from the first direction, wherein adjacent fluorescent stripes are made of diffe
1. A display system, comprising: a screen including a substrate on which a plurality of parallel fluorescent stripes are formed to be along a first direction and spaced from one another along a second direction distinct from the first direction, wherein adjacent fluorescent stripes are made of different fluorescent materials that absorb light at an excitation wavelength to emit light of different colors, respectively;an optical module to produce a plurality of excitation optical beams of light at the excitation wavelength, wherein each excitation optical beam is modulated to carry image data of different colors and the excitation optical beams collectively carry multi-colored image data for an image to be displayed on the screen,wherein the optical module includes a beam scanning mechanism that scans, along the second direction, the excitation optical beams on to the screen at different and adjacent screen positions along the first direction in one screen segment of the screen, to produce different scan lines along the second direction, respectively, in the screen segment, to cause the screen to emit light at different times at different positions in each scan line along the second direction and, to shift the excitation optical beams to other screen segments at different positions in the screen along the first direction, one screen segment at a time, to render images on the entirety of the screen;one or more optical sensors to detect light from the screen; anda feedback control loop that directs output of the one or more optical sensors to the optical module as a feedback signal,wherein the optical module responds to the feedback signal to detect an alignment error of the excitation beam on the screen, and, in response to the detected alignment error, the optical module operates to control the excitation beam to correct the detected alignment error. 2. The system as in claim 1, wherein the optical module comprises lasers that respectively produce the excitation optical beam and a modulation control which controls optical modulation of each excitation optical beam based on a pulse width modulation to turn on and off optical power and to control a time duration for tuning on optical power in modulating the image data for the different colors onto each excitation optical beam. 3. The system as in claim 2, wherein: the modulation control sets the time duration for turning on optical power in each excitation optical beam to be less than a duration for each excitation beam to scan across one fluorescent stripe along the second direction. 4. The system as in claim 3, wherein: the duration for each excitation beam to scan across one fluorescent stripe along the second direction includes a plurality of time durations for turning on and off optical power in each excitation optical beam. 5. The system as in claim 1, wherein: the optical module comprises lasers that respectively produce the excitation optical beam and a modulation control which controls optical modulation of each excitation optical beam based on a pulse code modulation to turn on and off optical power and to control an optical power level in each excitation optical beam to be at digitalized levels in modulating the image data for the different colors onto each excitation optical beam. 6. The system as in claim 1, wherein: the optical module comprises lasers that respectively produce the excitation optical beam and a modulation control which controls optical modulation of each excitation optical beam based on a combination of a pulse code modulation and a pulse width modulation in modulating the image data for the different colors onto each excitation optical beam, the modulation control configured to turn on and off optical power of each excitation optical beam and to control an optical power level in each excitation optical beam to be at digitalized levels and a time duration for tuning on optical power. 7. The system as in claim 6, wherein: the modulation control sets the time duration for turning on optical power in each excitation optical beam to be less than a duration for each excitation beam to scan across one fluorescent stripe along the second direction so that the duration for each excitation beam to scan across one fluorescent stripe along the second direction includes a plurality of time durations for turning on and off optical power in each excitation optical beam. 8. The system as in claim 1, wherein: the optical module comprises diode lasers that respectively produce the excitation optical beam and a modulation control which controls electrical drive currents to the diode lasers, respectively, to control optical modulation of the excitation optical beams, respectively. 9. The system as in claim 1, comprising: a dichroic layer on a first side of the fluorescent materials to transmit light at the excitation wavelength and to reflect light emitted by the fluorescent materials, the dichroic layer including a composite film stack of multiple polymer films that are coextruded to have alternating high and low refractive indices to form an optical interference filter. 10. The system as in claim 1, comprising: a dichroic layer on a first side of the fluorescent materials to transmit light at the excitation wavelength and to reflect light emitted by the fluorescent materials, wherein the dichroic layer includes a stack of films which have different refractive indices between two adjacent films and are laminated or fused with one another. 11. The system as in claim 1, comprising: a Fresnel lens located on the first side of the fluorescent materials to direct the excitation beam scanned by the optical module at different incident angles at different locations on the screen to be approximately normal to the screen. 12. The system as in claim 1, wherein: the optical module elongates each excitation optical beam along the first direction on the screen to have a first beam dimension greater than a second beam dimension along the second direction. 13. A method for displaying images on a screen that includes a substrate on which a plurality of parallel fluorescent stripes are formed to be along a first direction and spaced from one another along a second direction distinct from the first direction, wherein adjacent fluorescent stripes are made of different fluorescent materials that absorb light at an excitation wavelength to emit light of different colors, respectively, the method comprising: producing a plurality of excitation optical beams of light at the excitation wavelength so that each excitation optical beam is modulated to carry image data of different colors and the excitation optical beams collectively carry multi-colored image data for an image to be displayed on the screen,scanning the excitation optical beams onto the screen along the second direction, at different and adjacent screen positions along the first direction in one screen segment of the screen, to produce different scan lines along the second direction, respectively, in the screen segment, to cause the screen to emit light at different times at different positions in each scan line along the second direction and,shifting the excitation optical beams to other screen segments at different positions in the screen along the first direction, one screen segment at a time, render images on the entirety of the screen;using one or more optical sensors to detect light from the screen for indicating spatial alignment of the excitation optical beams on the screen with respect to parallel fluorescent stripes along the second direction;operating a feedback control loop that directs output of the one or more optical sensors as a feedback signal indicating the spatial alignment of the excitation optical beams on the screen with respect to parallel fluorescent stripes along the second direction;in response to the feedback signal, processing the feedback signal to detect an alignment error of each excitation beam on the screen; andin response to the detected alignment error, controlling each excitation beam to correct the detected alignment error. 14. The method as in claim 13, comprising: controlling optical modulation of each excitation optical beam based on a pulse width modulation to turn on and off optical power and to control a time duration for tuning on optical power in modulating the image data for the different colors onto each excitation optical beam. 15. The method as in claim 14, comprising: setting the time duration for turning on optical power in each excitation optical beam to be less than a duration for each excitation beam to scan across one fluorescent stripe along the second direction. 16. The method as in claim 15, wherein: the duration for each excitation beam to scan across one fluorescent stripe along the second direction includes a plurality of equal time durations for turning on and off optical power in each excitation optical beam. 17. The method as in claim 13, comprising: controlling optical modulation of each excitation optical beam based on a pulse code modulation to turn on and off optical power and to control an optical power level in each excitation optical beam to be at digitalized levels in modulating the image data for the different colors onto each excitation optical beam. 18. The method as in claim 13, comprising: controlling optical modulation of each excitation optical beam based on a combination of a pulse code modulation and a pulse width modulation in modulating the image data for the different colors onto each excitation optical beam, the modulation control configured to turn on and off optical power of each excitation optical beam and to control an optical power level in each excitation optical beam to be at digitalized levels and a time duration for tuning on optical power. 19. The method as in claim 18, comprising: setting the time duration for turning on optical power in each excitation optical beam to be less than a duration for each excitation beam to scan across one fluorescent stripe along the second direction so that the duration for each excitation beam to scan across one fluorescent stripe along the second direction includes a plurality of time durations for turning on and off optical power in each excitation optical beam. 20. The method as in claim 13, comprising: operating diode lasers to respectively produce the excitation optical beam; and controlling electrical drive currents to the diode lasers, respectively, to control optical modulation of the excitation optical beams, respectively.
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