US5949393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image display apparatus having phosphors arranged in a checkerboard pattern and its driving method
Assignee: Canon Inc
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Filing: 1997-03-10
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Granted: 1999-09-07
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Expires: 2017-03-10
Abstract
Abstract In an image display apparatus which has a multi-electron beam source in which a plurality of electron emission elements are connected in a matrix pattern using a plurality of data electrodes and a plurality of scanning electrodes, and a fluorescent screen having phosphors of three primary colors R, G, and B corresponding to the electron emission elements, natural white color emission is obtained while suppressing a decrease in G luminance, using, e.g., a checkerboard layout which has a G spatial resolution higher than the R or B spatial resolution and includes more G phosphors than the R or B phosphors. For this purpose, the scanning electrodes connected to the electron emission elements corresponding to the G phosphors are electrically independent from those connected to the electron emission elements corresponding to the R or B phosphors, signal components corresponding to the G phosphors and signal components corresponding to the R or B phosphors are extracted from an image signal for a 1-line period, and the scanning electrode connected to the electron emission elements corresponding to the G phosphors and those connected to the electron emission elements corresponding to the R or B phosphors are selected during successively the 1-line period.
Inventors
- 👤 Kunihiro Sakai
- 👤 Hidetoshi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:31
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/123; H01J31/125; H01J31/127; G09G2300/00; G09G2300/04; G09G2300/0439; G09G2300/0452; G09G2310/00; G09G2310/02; G09G2310/0264; G09G2310/0297; H01J2201/00; H01J2201/30; H01J2201/316; H01J2201/3165; H01J2329/00; H01J2329/02; H01J2329/04; H01J2329/0486; H01J2329/0489; H01J2329/18; H01J2329/30
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
116 words
An image display apparatus which comprises a multi-electron beam source in which a plurality of electron emission elements are connected in a matrix pattern using a plurality of data electrodes and a plurality of scanning electrodes, and a fluorescent screen having phosphors of three primary colors R, G, and B corresponding to said electron emission elements, wherein said fluorescent screen has the G phosphors at a ratio larger than the ratio of the R or B phosphors, and said multi-electron beam source has the scanning electrodes connected to the electron emission elements corresponding to the G phosphors electrically independent from the scanning electrodes connected to the electron emission elements corresponding to the R or B phosphors.
Claim 2
Dependent Claim
116 words
An image display apparatus which comprises a multi-electron beam source in which a plurality of electron emission elements are connected in a matrix pattern using a plurality of data electrodes and a plurality of scanning electrodes, and a fluorescent screen having phosphors of three primary colors R, G, and B corresponding to said electron emission elements, wherein said fluorescent screen has the G phosphors at a ratio larger than the ratio of the R or B phosphors, and said multi-electron beam source has the scanning electrodes connected to the electron emission elements corresponding to the G phosphors electrically independent from the scanning electrodes connected to the electron emission elements corresponding to the R or B phosphors.
Claim 3
Dependent Claim
20 words
The apparatus according to claim 1, wherein the phosphors are arranged in a checkerboard pattern at an area ratio R:G:B=1:2:1.
Claim 4
Dependent Claim
51 words
The apparatus according to claim 1 or 2, wherein a period for selecting the scanning electrode connected to the electron emission elements corresponding to the G phosphors is substantially 1/2 of a period for selecting the scanning electrode connected to the electron emission elements corresponding to the R or B phosphors.
Claim 5
Dependent Claim
73 words
The apparatus according to claim 1, wherein signal components corresponding to the G phosphors and signal components corresponding to the R or B phosphors are extracted from an image signal for a 1-line period, and the scanning electrode connected to the electron emission elements corresponding to the G phosphors and the scanning electrode connected to the electron emission elements corresponding to the R or B phosphors are selected successively during the 1-line period.
Claim 6
Dependent Claim
56 words
The apparatus according to claim 1, wherein an image signal for a 1-line period is divided into signal components for two rows, the scanning electrodes for two rows are selected successively during a given 1-line period, and a portion of the rows selected during the 1-line period can be selected again during the next 1-line period.
Claim 7
Dependent Claim
17 words
The apparatus according to claim 1, wherein said electron emission elements comprise surface conduction type emission elements.
Claim 8
Dependent Claim
15 words
The apparatus according to claim 1, wherein said electron emission elements comprise FE type elements.
Claim 9
Dependent Claim
15 words
The apparatus according to claim 1, wherein said electron emission elements comprise MIM type elements.
Claim 10
Independent Claim
180 words
A method of driving an image display apparatus which comprises a multi-electron beam source in which a plurality of electron emission elements are connected in a matrix pattern using a plurality of data electrodes and a plurality of scanning electrodes, and a fluorescent screen having phosphors of three primary colors R, G, and B corresponding to said electron emission elements, wherein the G phosphors are arranged at a ratio larger than the ratio of the R or B phosphors, the scanning electrodes connected to the electron emission elements corresponding to the G phosphors are electrically independent from the scanning electrodes connected to the electron emission elements corresponding to the R or B phosphors, and signal components corresponding to the G phosphors and signal components corresponding to the R or B phosphors are extracted from an image signal for a 1-line period, and the scanning electrode connected to the electron emission elements corresponding to the G phosphors and the scanning electrode connected to the electron emission elements corresponding to the R or B phosphors are selected successively during the 1-line period.
Claim 11
Independent Claim
180 words
A method of driving an image display apparatus which comprises a multi-electron beam source in which a plurality of electron emission elements are connected in a matrix pattern using a plurality of data electrodes and a plurality of scanning electrodes, and a fluorescent screen having phosphors of three primary colors R, G, and B corresponding to said electron emission elements, wherein the G phosphors are arranged at a ratio larger than the ratio of the R or B phosphors, the scanning electrodes connected to the electron emission elements corresponding to the G phosphors are electrically independent from the scanning electrodes connected to the electron emission elements corresponding to the R or B phosphors, and signal components corresponding to the G phosphors and signal components corresponding to the R or B phosphors are extracted from an image signal for a 1-line period, and the scanning electrode connected to the electron emission elements corresponding to the G phosphors and the scanning electrode connected to the electron emission elements corresponding to the R or B phosphors are selected successively during the 1-line period.
Claim 12
Dependent Claim
20 words
The method according to claim 9, wherein the phosphors are arranged in a checkerboard pattern at an area ratio R:G:B=1:2:1.
Claim 13
Dependent Claim
51 words
The method according to claim 9 or 10, wherein a period for selecting the scanning electrode connected to the electron emission elements corresponding to the G phosphors is substantially 1/2 of a period for selecting the scanning electrode connected to the electron emission elements corresponding to the R or B phosphors.
Claim 14
Dependent Claim
56 words
The method according to claim 9, wherein an image signal for a 1-line period is divided into signal components for two rows, the scanning electrodes for two rows are selected sucessively during a given 1-line period, and a portion of the rows selected during the 1-line period can be selected again during the next 1-line period.
Claim 15
Dependent Claim
17 words
The method according to claim 9, wherein said electron emission elements comprise surface conduction type emission elements.
Claim 16
Dependent Claim
15 words
The method according to claim 9, wherein said electron emission elements comprise FE type elements.
Claim 17
Dependent Claim
15 words
The method according to claim 9, wherein said electron emission elements comprise MIM type elements.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2002-09-06 | 2003-03-08 | 2003-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-09-06 | 2007-03-08 | 2007-09-07 | $3760.00 | Window Closed / Lapsed |
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