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US3801864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display device
Assignee: Hitachi Ltd
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Filing: 1973-02-15
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Granted: 1974-04-02
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Expires: 1993-02-15
Abstract
Abstract A display device comprising means for forming a discharge space including a plurality of discharge electrodes constituting an electron source, a plurality of first control grids arranged in parallel for controlling the electron beam generated from the discharge space, a plurality of second control grids arranged in parallel with each other and at right angles to said first control grids, means for accelerating the electron beam controlled by said first and second control grids, a phosphor illuminated by the impingement thereupon of the accelerated electron beam, means for applying to said second control grids pulse voltages in sequence, means for applying a pulse voltage to said discharge electrodes to effect a discharge only in the space corresponding to the control grid to which the pulse voltage is applied, and means for applying a pulse-width-modulated voltage to said first control grids.
Inventors
- 👤 T Seko
- 👤 T Kaji
- 👤 M Yamane
- 👤 S Murayama
- 👤 T Miyashita
- 👤 M Mizushima
- 👤 S Shinada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:12
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49; H01J17/498; H01J29/00; H01J29/46; H01J29/467
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
361 words
A display device comprising a first insulating member for forming a discharge space for effecting gaseous discharge, said first insulating member being provided with a plurality of discharge electrodes as a source of electrons, a second insulating member for hermetically sealing said discharge space, a conductive member Provided with a plurality of small apertures through which an electron beam from said discharge space is adapted to be passed, a third insulating member for forming an accelerating space for accelerating the electron beam passing through said plurality of small apertures, a transparent insulating member for hermetically sealing said accelerating space, first and second control grids interposed between said conductive member and said third insulating member for controlling the entrance of said electron beam into said accelerating space, said control grids intersecting each other at the positions corresponding to said small apertures, an insulating separator provided with a plurality of small apertures at the positions corresponding to those of said small apertures in said conductive member in such a manner that said first and second control grids in certain spaced relationship intersect, a phosphor formed on said transparent insulating member, a transparent electrode formed intermediate said transparent insulating member and said phosphor for causing an electron beam from said accelerating space to impinge upon said phosphor, means for supplying sequential control pulses to said plurality of second control grids, a power supply for generating a discharge voltage in synchronism with said control pulse applied to said second control grids, means connected with said power supply for applying said discharge voltage only to the discharge electrode in the portion of said discharge space corresponding to said second control grids to which said control pulse is applied, means for applying to said first plurality of control grids a signal which is pulse-modulated from a predetermined display signal in accordance with the level of each pulse of said display signal, and means for applying a high voltage to said transparent electrode for accelerating the electron beam in said accelerating space, whereby a gaseous discharge occurring in that portion of said discharge space which corresponds to said second control grid to which said control voltage is applied.
Claim 2
Dependent Claim
361 words
A display device comprising a first insulating member for forming a discharge space for effecting gaseous discharge, said first insulating member being provided with a plurality of discharge electrodes as a source of electrons, a second insulating member for hermetically sealing said discharge space, a conductive member Provided with a plurality of small apertures through which an electron beam from said discharge space is adapted to be passed, a third insulating member for forming an accelerating space for accelerating the electron beam passing through said plurality of small apertures, a transparent insulating member for hermetically sealing said accelerating space, first and second control grids interposed between said conductive member and said third insulating member for controlling the entrance of said electron beam into said accelerating space, said control grids intersecting each other at the positions corresponding to said small apertures, an insulating separator provided with a plurality of small apertures at the positions corresponding to those of said small apertures in said conductive member in such a manner that said first and second control grids in certain spaced relationship intersect, a phosphor formed on said transparent insulating member, a transparent electrode formed intermediate said transparent insulating member and said phosphor for causing an electron beam from said accelerating space to impinge upon said phosphor, means for supplying sequential control pulses to said plurality of second control grids, a power supply for generating a discharge voltage in synchronism with said control pulse applied to said second control grids, means connected with said power supply for applying said discharge voltage only to the discharge electrode in the portion of said discharge space corresponding to said second control grids to which said control pulse is applied, means for applying to said first plurality of control grids a signal which is pulse-modulated from a predetermined display signal in accordance with the level of each pulse of said display signal, and means for applying a high voltage to said transparent electrode for accelerating the electron beam in said accelerating space, whereby a gaseous discharge occurring in that portion of said discharge space which corresponds to said second control grid to which said control voltage is applied.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |