US4868555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent display device
Assignee: Futaba Corp
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Filing: 1987-12-10
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Granted: 1989-09-19
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Expires: 2007-12-10
Abstract
Abstract A fluorescent display device capable of significantly narrowing intervals between picture cells without narrowing an interval between each adjacent two control electrodes to exhibit a display with high resolution and simplifying its structure. The fluorescent display device includes a signal generating circuit for supplying control electrode drive signals different in voltage to a pair of selected control electrodes to control a display.
Inventors
- 👤 Hiroshi Watanabe
- 👤 Satoshi Nagasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:16
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A fluorescent display device comprising: a plurality of phosphor-deposited anode electrodes arranged so as to extend in parallel to each other; a plurality of control electrodes arranged in a direction crossing said anode electrodes; an electron emitting source means placed apart from said control electrodes for emitting electrons; an envelope for receiving said anode electrodes, control electrodes and electron emitting source therein; anode drive means for applying a display signal to each of said anode electrodes; control electrode drive means for simultaneously supplying a control electrode drive signal to a pair of adjacent control electrodes selected; and signal generating means for supplying control electrode drive signals different in voltage to a pair of said selected control electrodes.
Claim 2
Dependent Claim
117 words
A fluorescent display device comprising: a plurality of phosphor-deposited anode electrodes arranged so as to extend in parallel to each other; a plurality of control electrodes arranged in a direction crossing said anode electrodes; an electron emitting source means placed apart from said control electrodes for emitting electrons; an envelope for receiving said anode electrodes, control electrodes and electron emitting source therein; anode drive means for applying a display signal to each of said anode electrodes; control electrode drive means for simultaneously supplying a control electrode drive signal to a pair of adjacent control electrodes selected; and signal generating means for supplying control electrode drive signals different in voltage to a pair of said selected control electrodes.
Claim 3
Dependent Claim
25 words
The fluorescent display device as defined in claim 1, wherein said signal generating means comprises a timing control circuit and a step wave generating circuit.
Claim 4
Dependent Claim
52 words
The fluorescent display device-as defined in claim 2, wherein said timing control circuit generates complementary voltage clock pulses to be supplied to said control electrode drive means and complementary voltage control pulses to be supplied to said step wave generating circuit for generating output signals in response to said voltage control pulses.
Claim 5
Dependent Claim
30 words
The fluorescent display device as defined in claim 3, wherein said complementary voltage control pulses consist of a low level voltage control pulse and a high level voltage control pulse.
Claim 6
Dependent Claim
35 words
The fluorescent display device as defined in claim 3, wherein said control electrode drive means generates a signal to be supplied to said control electrode in response to a rising edge of said clock pulses.
Claim 7
Dependent Claim
50 words
The fluorescent display device as defined in claim 4, wherein said step wave generating circuit generates a first high level output signal in response to said low level voltage control pulse supplied to said step wave generating circuit from said timing control circuit to be supplied to said control electrodes.
Claim 8
Dependent Claim
48 words
The fluorescent display device as defined in claim 4, wherein said wave generating circuit generates a second high level output signal in response to said high level voltage control pulse supplied to said wave generating circuit from said timing control circuit to be supplied to said control electrodes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |