US5327229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display device
Assignee: Victor Company of Japan Ltd
•
Filing: 1993-02-11
•
Granted: 1994-07-05
•
Expires: 2013-02-11
Abstract
Abstract A clear color image having a high contrast ratio without particular coloration is displayed on a screen by improved display apparatus. Such display apparatus is comprised of a spatial light modulator including a photo-conductive layer, a photo-modulator layer and a dielectric mirror, a device for writing color images of different colors onto the spatial light modulator time-divisionally in a sequence of the different colors, a reading device for producing reading lights having different colors in synchronism with time-divisional writing of the color images, and for projecting the reading lights to the spatial light modulator, a driving device for supplying the spatial light modulator with different voltages and frequencies correspondingly with the reading light of different colors and in synchronism with time-divisional projections of the reading lights, and a device for projecting the color images read out from the spatial light modulator on the display device. The dielectric mirror may have a light absorbance characteristic controlled to be wavelength-selective to absorb a color of light to which the photo-conductive layer is most sensitive, so that lights having different colors leaked into the photo-conductive layer through the dielectric mirror are controlled to cause a uniform impedance of the photo-conductive layer.
Inventors
- 👤 Toshio Konno
- 👤 Shintaro Nakagaki
- 👤 Ichiro Negishi
- 👤 Tetsuji Suzuki
- 👤 Fujiko Tatsumi
- 👤 Ryusaku Takahashi
- 👤 Hiroyuki Bonde
- 👤 Tsutomu Matsumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:35
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/312; H04N9/3111
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A display device for displaying color information comprising: a spatial light modulator including at least a photo-conductive layer, a photo-modulator layer and a dielectric mirror; writing means for writing optical information represented by different colors onto said spatial light modulator time-divisionally in a sequence of said different colors; reading means for producing reading lights having said different colors in synchronism with time-divisional writing of said optical information, and for projecting said reading lights to said spatial light modulator for reading said optical information written thereon; driving means for supplying said spatial light modulator with different driving signals correspondingly with said reading lights having said different colors and in synchronism with time-divisional projections of said reading lights; and means for projecting said optical information read out from said spatial light modulator by said reading lights on display means for displaying said color information.
Claim 2
Dependent Claim
142 words
A display device for displaying color information comprising: a spatial light modulator including at least a photo-conductive layer, a photo-modulator layer and a dielectric mirror; writing means for writing optical information represented by different colors onto said spatial light modulator time-divisionally in a sequence of said different colors; reading means for producing reading lights having said different colors in synchronism with time-divisional writing of said optical information, and for projecting said reading lights to said spatial light modulator for reading said optical information written thereon; driving means for supplying said spatial light modulator with different driving signals correspondingly with said reading lights having said different colors and in synchronism with time-divisional projections of said reading lights; and means for projecting said optical information read out from said spatial light modulator by said reading lights on display means for displaying said color information.
Claim 3
Dependent Claim
19 words
A display device as claimed in claim 1, wherein said different driving signals have different voltages from each other.
Claim 4
Dependent Claim
19 words
A display device as claimed in claim 1, wherein said different driving signals have different frequencies from each other.
Claim 5
Dependent Claim
21 words
A display device as claimed in claim 1, wherein said different driving signals have different voltages and frequencies from each other.
Claim 6
Dependent Claim
162 words
A display device for displaying color information comprising: a spatial light modulator including at least a photo-conductive layer, a photo-modulator layer and a dielectric mirror, said dielectric mirror having a light absorbance characteristic controlled to be wavelength-selective to absorb a color of light to which said photo-conductive layer is most sensitive so that lights having different colors leaked into said photo-conductive layer through said dielectric mirror are controlled to cause a uniform impedance of said photo-conductive layer; writing means for writing optical information represented by different colors onto said spatial light modulator time-divisionally in a sequence of said different colors; reading means for producing reading lights having said different colors in synchronism with time-divisional writing of said optical information, and for projecting said reading lights to said spatial light modulator for reading said optical information written thereon; means for projecting said optical information read out from said spatial light modulator by said reading lights on display means for displaying said color information.
Claim 7
Dependent Claim
162 words
A display device for displaying color information comprising: a spatial light modulator including at least a photo-conductive layer, a photo-modulator layer and a dielectric mirror, said dielectric mirror having a light absorbance characteristic controlled to be wavelength-selective to absorb a color of light to which said photo-conductive layer is most sensitive so that lights having different colors leaked into said photo-conductive layer through said dielectric mirror are controlled to cause a uniform impedance of said photo-conductive layer; writing means for writing optical information represented by different colors onto said spatial light modulator time-divisionally in a sequence of said different colors; reading means for producing reading lights having said different colors in synchronism with time-divisional writing of said optical information, and for projecting said reading lights to said spatial light modulator for reading said optical information written thereon; means for projecting said optical information read out from said spatial light modulator by said reading lights on display means for displaying said color information.
References Cited (Backward Citations)
US4124545A
Cited
US4090219A
Cited
US4907862A
Cited
JPS62250425A
Cited
US4786146A
Cited
US5009490A
Cited
US5111315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-04 | 1998-01-03 | 1998-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-04 | 2002-01-03 | 2002-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-04 | 2006-01-03 | 2006-07-05 | $7700.00 | Window Closed / Lapsed |