US4992880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High definition video-rate laser-addressed liquid-crystal light-valve projection display
Assignee: United States Department of the Navy
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Filing: 1989-05-24
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Granted: 1991-02-12
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Expires: 2009-05-24
Abstract
Abstract A high definition, video-rate laser-addressed liquid-crystal light-valve projection display provides for real-time applications to large-area projection displays. A laser raster scanner uses acousto-optic components to modulate and deflect the laser beam. An acoustic optical, acoustic traveling wave lens is included to increase the optical resolution of the scanner system. A liquid-crystal light-valve spatially is modulated by a high resolution coherent beam to responsibly modulate a high intensity light coming from an arc lamp source. The modulated high intensity light is reflected from the liquid-crystal light-valve and is projected onto a large screen. The use of acousto-optic Bragg cells to modulate, horizontally track, horizontally chirp and vertically impart a beam of coherent light allows a projection of a 1075-line RS-343A high definition or resolution TV standard image on the screen.
Inventors
- 👤 John A. Trias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:48
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/74; H04N5/7416; H04N5/7441; G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/30; G09B9/32; G09B9/323
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
333 words
An apparatus for displaying high definition projected images on a distant screen in accordance with a greater than 1000 TV-line resolution at video-image signal rates comprising: a laser providing a beam of coherent light; means disposed to receive the beam of coherent light for modulating it at the video-image signal rates; means disposed to receive the modulated beam of coherent light for tracking the modulated beam of coherent light in a horizontal direction; an acousto-optic traveling wave lens disposed to receive the modulated and tracked beam of coherent light for chirping the modulated and tracked beam of coherent light to scan a focused spot along a horizontal line to thereby increase the resolution thereof; means disposed to receive the modulated, tracked and chirped beam of coherent light for imparting a scan thereof in the vertical direction; means connected to the modulating means, the tracking means, the acousto-optic traveling wave lens and the imparting means for providing signals to control the modulation, horizontal tracking, horizontal chirping and vertical imparting of the beam of coherent light; means aligned to receive the modulated, horizontally tracked, horizontally chirped and vertically imparted beam of coherent light for selectively changing the polarization orientation of linearly polarized light incident thereon in direct response to the voltage pattern directly produced therein by the modulated, horizontally tracked, horizontally chirped and vertically imparted beam of coherent light; means disposed for projecting a high intensity light beam in a light path to the light polarization orientation changing means; and a liquid-crystal light valve interposed in said light path between the light polarization orientation changing means and the high intensity light beam projecting means for reflecting linearly polarized high intensity light onto the light polarization orientation changing means and for directing modulated reflected high intensity light modulated in accordance with the modulated, horizontally tracked, horizontally chirped and vertical imparted beam of coherent light onto the distant screen in the form of real-time, high definition images at video-image signal rates at greater than 1000 TV-line resolution.
Claim 2
Independent Claim
333 words
An apparatus for displaying high definition projected images on a distant screen in accordance with a greater than 1000 TV-line resolution at video-image signal rates comprising: a laser providing a beam of coherent light; means disposed to receive the beam of coherent light for modulating it at the video-image signal rates; means disposed to receive the modulated beam of coherent light for tracking the modulated beam of coherent light in a horizontal direction; an acousto-optic traveling wave lens disposed to receive the modulated and tracked beam of coherent light for chirping the modulated and tracked beam of coherent light to scan a focused spot along a horizontal line to thereby increase the resolution thereof; means disposed to receive the modulated, tracked and chirped beam of coherent light for imparting a scan thereof in the vertical direction; means connected to the modulating means, the tracking means, the acousto-optic traveling wave lens and the imparting means for providing signals to control the modulation, horizontal tracking, horizontal chirping and vertical imparting of the beam of coherent light; means aligned to receive the modulated, horizontally tracked, horizontally chirped and vertically imparted beam of coherent light for selectively changing the polarization orientation of linearly polarized light incident thereon in direct response to the voltage pattern directly produced therein by the modulated, horizontally tracked, horizontally chirped and vertically imparted beam of coherent light; means disposed for projecting a high intensity light beam in a light path to the light polarization orientation changing means; and a liquid-crystal light valve interposed in said light path between the light polarization orientation changing means and the high intensity light beam projecting means for reflecting linearly polarized high intensity light onto the light polarization orientation changing means and for directing modulated reflected high intensity light modulated in accordance with the modulated, horizontally tracked, horizontally chirped and vertical imparted beam of coherent light onto the distant screen in the form of real-time, high definition images at video-image signal rates at greater than 1000 TV-line resolution.
Claim 3
Dependent Claim
59 words
An apparatus according to claim 1 in which the modulating means, the tracking means, the acousto-optic traveling wave lens and the imparting means are Bragg cells optically cooperating to assure the reflection of a high intensity light onto the distant screen in the form of real-time, high definition images at video-image signal rates at greater than 1000 TV-line resolution.
Claim 4
Independent Claim
174 words
An apparatus for modulating and scanning a coherent light beam to be suitable for a greater than 1000 TV-line resolution at video-image signal rates comprising: a laser providing a beam of coherent light; means disposed to receive the beam of coherent light for modulating it at the video-image signal rates; means disposed to receive the modulated beam of coherent light for tracking the modulated beam of coherent light in a horizontal direction; an acousto-optic traveling wave lens disposed to receive the modulated and tracked beam of coherent light for chirping and modulated and tracked beam of coherent light to scan a focused spot along a horizontal line to thereby increase the resolution thereof; means disposed to receive the modulated, tracked and chirped beam of coherent light for imparting a scan thereof in the vertical direction; and means connected to the modulating means, the tracking means, the acousto-optic traveling wave lens and the imparting means for providing signals to control the modulation, horizontal tracking, horizontal chirping and vertical imparting of the beam of coherent light.
Claim 5
Independent Claim
174 words
An apparatus for modulating and scanning a coherent light beam to be suitable for a greater than 1000 TV-line resolution at video-image signal rates comprising: a laser providing a beam of coherent light; means disposed to receive the beam of coherent light for modulating it at the video-image signal rates; means disposed to receive the modulated beam of coherent light for tracking the modulated beam of coherent light in a horizontal direction; an acousto-optic traveling wave lens disposed to receive the modulated and tracked beam of coherent light for chirping and modulated and tracked beam of coherent light to scan a focused spot along a horizontal line to thereby increase the resolution thereof; means disposed to receive the modulated, tracked and chirped beam of coherent light for imparting a scan thereof in the vertical direction; and means connected to the modulating means, the tracking means, the acousto-optic traveling wave lens and the imparting means for providing signals to control the modulation, horizontal tracking, horizontal chirping and vertical imparting of the beam of coherent light.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |