Patent US4857900A successfully refreshed from Google Patents.
US4857900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display device with color correction
Assignee: Canon Inc
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Filing: 1985-12-12
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Granted: 1989-08-15
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Expires: 2005-12-12
Abstract
Abstract A display device includes a light emission unit having a plurality of colors for radiating light by feeding electrical power thereto; a drive unit for feeding electrical power to the light emission unit; and a control unit for controlling the drive unit based on the color to be illuminated by the light emission unit.
Inventors
- 👤 Masahiro Rachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:39
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/04; G09G3/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
129 words
A display device comprising: a plurality of light emission units each having an anode emission member, a cathode member and a grid member, the light emission efficiencies in the light emission units being different for respective colors; drive means for supplying electrical power to said light emission units; and control means for controlling the drive means so that a small electrical power is supplied to the anode emission member and the grid member in the light emission units having the higher light emission efficiency while a large electrical power is supplied to the anode emission member and the grid member in the light emission units having lower light emission efficiency, and the electrical power supplied to the anode emission member being proportional to that supplied to the grid member.
Claim 2
Dependent Claim
129 words
A display device comprising: a plurality of light emission units each having an anode emission member, a cathode member and a grid member, the light emission efficiencies in the light emission units being different for respective colors; drive means for supplying electrical power to said light emission units; and control means for controlling the drive means so that a small electrical power is supplied to the anode emission member and the grid member in the light emission units having the higher light emission efficiency while a large electrical power is supplied to the anode emission member and the grid member in the light emission units having lower light emission efficiency, and the electrical power supplied to the anode emission member being proportional to that supplied to the grid member.
Claim 3
Dependent Claim
44 words
A display device according to claim 1, wherein said control means control said device means so that the supply time of the voltage supplied to the anode emission member of said light emission units is proportional to the voltage supplied to the grid member.
Claim 4
Dependent Claim
16 words
A display device according to claim 1, wherein said light emission units are fluorescent display tubes.
Claim 5
Dependent Claim
41 words
A display device according to claim 1, wherein said control means controls said drive means so as to supply the electrical power to a plurality of light emission units having the different colors in inverse ratio with the light emission efficiency.
Claim 6
Dependent Claim
118 words
A display device comprising: a plurality of light emission units each having an anode emission member, a cathode member and a grid member, the light emission efficiencies in the light emission units being different for respective colors; drive means for supplying electrical power to said light emission units; and control means for controlling said drive means so that a constant electrical power is supplied to the grid member of said light emission units, and a small electrical power is supplied to the anode emission member of said light emission units having the higher light emission efficiencies while a large electrical power is supplied to the anode emission member of said emission units having the lower light emission efficiencies.
Claim 7
Dependent Claim
118 words
A display device comprising: a plurality of light emission units each having an anode emission member, a cathode member and a grid member, the light emission efficiencies in the light emission units being different for respective colors; drive means for supplying electrical power to said light emission units; and control means for controlling said drive means so that a constant electrical power is supplied to the grid member of said light emission units, and a small electrical power is supplied to the anode emission member of said light emission units having the higher light emission efficiencies while a large electrical power is supplied to the anode emission member of said emission units having the lower light emission efficiencies.
Claim 8
Dependent Claim
29 words
A display device according to claim 5, wherein said control means controls the apply time of the voltage applied to the anode emission member in said light emission units.
Claim 9
Dependent Claim
16 words
A display device according to claim 5, wherein said light emission units are fluorescent display tubes.
Claim 10
Dependent Claim
42 words
A display device according to claim 5, wherein said control means controls said drive means so that the electrical power is supplied to a plurality of light emission units having the different emission efficiencies in inverse ratio with the light emission efficiency.
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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) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |