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US5021720A
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Display apparatus of the cathode ray tube type
Assignee: Canon Inc
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Filing: 1989-08-16
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Granted: 1991-06-04
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Expires: 2009-08-16
Abstract
Abstract A display apparatus of the CRT type displays information by use of a magnetic field. In this apparatus, a deviation amount of the image displayed on the CRT display screen from a reference position is detected by photo sensors arranged at the peripheral positions of the screen. The phase of the display information signal is adjusted for the vertical and horizontal sync signals regarding the CRT so that the display information can be displayed at the reference position on the screen on the basis of the detection information which is obtained from the photo sensors. Thus, the display information can be accurately displayed at the reference position on the CRT screen irrespective of whether the CRT screen is vertically or horizontally set without any influence of an electron beam by the deflecting coils of the display apparatus due to the earth's magnetic field or the like.
Inventors
- 👤 Harutsugu Aimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:46
CPC Classifications
G; G09; G09G; G09G1/00; H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/227
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
92 words
A display apparatus of a cathode ray tube comprising: detecting means for detecting an amount of deviation of an image displayed on a screen of a cathode ray tube from a reference position on said screen, with the deviation being due to the geomagnetism; and means for adjusting a phase of a signal of display information for a synchronization signal of the cathode ray tube so that the display information is displayed at the reference position on said screen on the basis of the result of the detection by said detecting means.
Claim 2
Dependent Claim
92 words
A display apparatus of a cathode ray tube comprising: detecting means for detecting an amount of deviation of an image displayed on a screen of a cathode ray tube from a reference position on said screen, with the deviation being due to the geomagnetism; and means for adjusting a phase of a signal of display information for a synchronization signal of the cathode ray tube so that the display information is displayed at the reference position on said screen on the basis of the result of the detection by said detecting means.
Claim 3
Dependent Claim
22 words
A display apparatus according to claim 1, wherein said deviation amount is an influence by a deflecting coil of said display apparatus.
Claim 4
Independent Claim
89 words
A method for operating a display apparatus of a cathode ray tube type comprising the steps of: discriminating a setting of said display apparatus; selecting either a display screen adjustment mode or an ordinary mode on the basis of the result of the discriminating step generating a special display pattern; detecting a deviation amount of said display pattern from a reference position; adjusting a display timing on the basis of said deviation amount detected; and displaying a desired pattern at a proper position on the basis of said adjustment.
Claim 5
Independent Claim
89 words
A method for operating a display apparatus of a cathode ray tube type comprising the steps of: discriminating a setting of said display apparatus; selecting either a display screen adjustment mode or an ordinary mode on the basis of the result of the discriminating step generating a special display pattern; detecting a deviation amount of said display pattern from a reference position; adjusting a display timing on the basis of said deviation amount detected; and displaying a desired pattern at a proper position on the basis of said adjustment.
Claim 6
Dependent Claim
31 words
A method for operating a display apparatus according to claim 3, wherein said discriminating step includes providing a switch arranged on the outer side of said apparatus as said discriminating means.
Claim 7
Dependent Claim
29 words
A method for operating a display apparatus according to claim 3, wherein said steps of generating a includes generating a pattern indicative of a size which can be displayed.
Claim 8
Dependent Claim
185 words
A display apparatus of a cathode ray tube type comprising: horizontal and vertical deflecting coils arranged in a throat position of the display apparatus; display information generating means for generating display information indicative of a pattern to be displayed for normal use or special display information indicative of a special pattern to be displayed; vertical synchronization generating means, connected to a driver unit of said vertical deflecting coil, for generating a vertical synchronization signal for said display; horizontal synchronization generating means, connected to a driver unit of said horizontal deflecting coil for generating a horizontal synchronization signal for said display; detecting means for detecting a position in which the special patter is displayed; and control means for controlling, upon power on of said apparatus, said display information generating means and said detecting means such that the special display information is generated and the display position of the special pattern is detected and controlling, in accordance with the display position of the special pattern detected by said detecting means, the vertical and horizontal synchronization signals such that the display position of the special pattern is adjusted.
Claim 9
Dependent Claim
185 words
A display apparatus of a cathode ray tube type comprising: horizontal and vertical deflecting coils arranged in a throat position of the display apparatus; display information generating means for generating display information indicative of a pattern to be displayed for normal use or special display information indicative of a special pattern to be displayed; vertical synchronization generating means, connected to a driver unit of said vertical deflecting coil, for generating a vertical synchronization signal for said display; horizontal synchronization generating means, connected to a driver unit of said horizontal deflecting coil for generating a horizontal synchronization signal for said display; detecting means for detecting a position in which the special patter is displayed; and control means for controlling, upon power on of said apparatus, said display information generating means and said detecting means such that the special display information is generated and the display position of the special pattern is detected and controlling, in accordance with the display position of the special pattern detected by said detecting means, the vertical and horizontal synchronization signals such that the display position of the special pattern is adjusted.
Claim 10
Dependent Claim
19 words
A display apparatus according to claim 6, wherein the special pattern is a pattern indicative of a display size.
Claim 11
Dependent Claim
38 words
A display apparatus according to claim 6, wherein said control means adjusts a phase of the special display information by shifting said phase for only a predetermined time for said vertical synchronization signal or said horizontal synchronization signal.
Claim 12
Dependent Claim
222 words
A display apparatus of a cathode ray tube type comprising: horizontal and vertical deflecting coils arranged in a throat position of the display apparatus; display information generating means for generating display information indicative of a pattern to be displayed for normal use or special display information indicative of a special pattern to be displayed; vertical synchronization generating means, connected to a driver unit of said vertical deflecting coil, for generating a vertical synchorization signal for said display; horizontal synchronization generating means, connected to a driver unit of said horizontal deflecting coil for generating a horizontal synchronization signal for said display; detecting means for detecting a position in which the special pattern is displayed; control means for controlling, upon power on of said apparatus or change in state in which said apparatus is set, said display information generating means and said detecting means such that the special display information is generated and the display position of the special pattern is detected and controlling, in accordance with the display position of the special pattern detected by said detecting means, the vertical and horizontal synchronization signal such that the display position of the special pattern is adjusted, wherein said horizontal and vertical deflecting coils are adjusted in a manner such that an influence by the earth's magnetic field in a setting state may be eliminated.
Claim 13
Dependent Claim
222 words
A display apparatus of a cathode ray tube type comprising: horizontal and vertical deflecting coils arranged in a throat position of the display apparatus; display information generating means for generating display information indicative of a pattern to be displayed for normal use or special display information indicative of a special pattern to be displayed; vertical synchronization generating means, connected to a driver unit of said vertical deflecting coil, for generating a vertical synchorization signal for said display; horizontal synchronization generating means, connected to a driver unit of said horizontal deflecting coil for generating a horizontal synchronization signal for said display; detecting means for detecting a position in which the special pattern is displayed; control means for controlling, upon power on of said apparatus or change in state in which said apparatus is set, said display information generating means and said detecting means such that the special display information is generated and the display position of the special pattern is detected and controlling, in accordance with the display position of the special pattern detected by said detecting means, the vertical and horizontal synchronization signal such that the display position of the special pattern is adjusted, wherein said horizontal and vertical deflecting coils are adjusted in a manner such that an influence by the earth's magnetic field in a setting state may be eliminated.
Claim 14
Dependent Claim
101 words
A display apparatus of a cathode ray tube comprising: detecting means for detecting an amount of deviation of an image displayed on a screen of a cathode ray tube from a reference position on said screen, with the deviation being due to the geomagnetism, wherein said detecting means comprises a plurality of sensors; and means for adjusting a phase of a signal of display information for a synchronization signal of the cathode ray tube so that the display information is displayed at the reference position on said screen on the basis of the result of the detection by said detecting means.
Claim 15
Dependent Claim
101 words
A display apparatus of a cathode ray tube comprising: detecting means for detecting an amount of deviation of an image displayed on a screen of a cathode ray tube from a reference position on said screen, with the deviation being due to the geomagnetism, wherein said detecting means comprises a plurality of sensors; and means for adjusting a phase of a signal of display information for a synchronization signal of the cathode ray tube so that the display information is displayed at the reference position on said screen on the basis of the result of the detection by said detecting means.
Claim 16
Dependent Claim
21 words
A display apparatus according to claim 10, wherein said plurality of sensors are disposed on a peripheral portion of said screen.
Claim 17
Dependent Claim
14 words
A display apparatus according to claim 11, wherein said plurality of sensors are photosensors.
Claim 18
Dependent Claim
16 words
A display apparatus according to claim 6, wherein said detecting means comprises a plurality of sensors.
Claim 19
Dependent Claim
22 words
A display apparatus according to claim 13, wherein said plurality of sensors are disposed on a peripheral portion of said display apparatus.
Claim 20
Dependent Claim
14 words
A display apparatus according to claim 12, wherein said plurality of sensors are photosensors.
Claim 21
Dependent Claim
201 words
A display apparatus of a cathode ray tube type comprising: horizontal and vertical deflecting coils arranged in a throat position of the display apparatus; display information generating means for generating display information indicative of a pattern to be displayed for normal use or special display information indicative of a special pattern to be displayed; vertical synchronization generating means, connected to a driver unit of said vertical deflecting coil, for generating a vertical synchronization signal for said display; horizontal synchronization generating means, connected to a driver unit of said horizontal deflecting coil for generating a horizontal synchronization signal for said display; detecting means for detecting a position in which the special pattern is displayed; and control means for controlling, upon a change in state in which said apparatus has been set into a lateral state or into a vertical long state, said display information generating means and said detecting means such that the special display information is generated and the display position of the special pattern is detected and controlling, in accordance with the display position of the special pattern detected by said detecting means, the vertical and horizontal synchronization signals such that the display position of the special pattern is adjusted.
Claim 22
Dependent Claim
201 words
A display apparatus of a cathode ray tube type comprising: horizontal and vertical deflecting coils arranged in a throat position of the display apparatus; display information generating means for generating display information indicative of a pattern to be displayed for normal use or special display information indicative of a special pattern to be displayed; vertical synchronization generating means, connected to a driver unit of said vertical deflecting coil, for generating a vertical synchronization signal for said display; horizontal synchronization generating means, connected to a driver unit of said horizontal deflecting coil for generating a horizontal synchronization signal for said display; detecting means for detecting a position in which the special pattern is displayed; and control means for controlling, upon a change in state in which said apparatus has been set into a lateral state or into a vertical long state, said display information generating means and said detecting means such that the special display information is generated and the display position of the special pattern is detected and controlling, in accordance with the display position of the special pattern detected by said detecting means, the vertical and horizontal synchronization signals such that the display position of the special pattern is adjusted.
Claim 23
Dependent Claim
19 words
A display apparatus according to claim 16, wherein the special pattern is a pattern indicative of a display size.
Claim 24
Dependent Claim
38 words
Q display apparatus according to claim 16, wherein said control means adjusts a phase of the special display information by shifting said phase for only a predetermined time for said vertical synchronization signal or said horizontal synchronization signal.
Claim 25
Dependent Claim
16 words
A display apparatus according to claim 16, wherein said detecting means comprises a plurality of sensors.
Claim 26
Dependent Claim
22 words
A display apparatus according to claim 19, wherein said plurality of sensors are disposed on a peripheral portion of said display apparatus.
References Cited (Backward Citations)
US4314179A
Cited
US4542377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-03 | 1994-12-03 | 1995-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-03 | 1998-12-03 | 1999-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-03 | 2002-12-03 | 2003-06-04 | $7700.00 | Window Closed / Lapsed |