Patent US3076275A successfully refreshed from Google Patents.
Patent EP0318116A1 successfully refreshed from Google Patents.
EP0318116A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Display device
Assignee: Koninklijke Philips NV
•
Filing: 1988-11-24
•
Granted: —
•
Expires: 2008-11-24
Abstract
Abstract A cathode unit (31), comprising one or more cathodes (10), deflection means (15) and a row of electron multipliers (20), is arranged on an end wall (6) of the display device for the purpose of obtaining a flat display device. If necessary, the cathode unit may be manufactured as a separate unit.
Inventors
- 👤 Albert Ferdinand Aalders
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 03:49
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/72; H01J29/74; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/123; H01J31/124
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
140 words
A display device comprising a substantially evacuated envelope having mainly flat, substantially parallel front and rear walls, a layer of luminescent material along the inner surface of the front wall and means for generating at least one electron beam which moves substantially in a plane parallel to the front and rear walls and which can be selectively deflected in the direction of the layer of luminescent material via deflection means in a deflection unit, so that each beam scans at least a part of the layer of luminescent material, said device for generating electrons comprising at least one cathode unit having at least one cathode which can be controlled separately, characterized in that the cathode unit comprises deflection means and in that a row of electron multipliers is arranged in the beam path between the cathode and the deflection unit.
Claim 2
Dependent Claim
140 words
A display device comprising a substantially evacuated envelope having mainly flat, substantially parallel front and rear walls, a layer of luminescent material along the inner surface of the front wall and means for generating at least one electron beam which moves substantially in a plane parallel to the front and rear walls and which can be selectively deflected in the direction of the layer of luminescent material via deflection means in a deflection unit, so that each beam scans at least a part of the layer of luminescent material, said device for generating electrons comprising at least one cathode unit having at least one cathode which can be controlled separately, characterized in that the cathode unit comprises deflection means and in that a row of electron multipliers is arranged in the beam path between the cathode and the deflection unit.
Claim 3
Dependent Claim
18 words
A display device as claimed in Claim 1, characterized in that the cathode unit comprises a semiconductor cathode.
Claim 4
Dependent Claim
30 words
A display device as claimed in Claim 2, characterized in that the main surface of the semiconductor body extends substantially perpendicular to the plane in which the electron beams move.
Claim 5
Dependent Claim
27 words
A display device as claimed in any one of the preceding Claims, characterized in that the display device has a rear wall of a soft magnetic material.
Claim 6
Dependent Claim
19 words
A display device as claimed in Claim 4, characterized in that the display device has a steel rear wall.
Claim 7
Dependent Claim
37 words
A display device as claimed in Claim 1, 2 or 3, characterized in that the plane within which the electron beams move parallel to the front and rear walls is substantially entirely surrounded by a magnetic shield.
Claim 8
Dependent Claim
22 words
A display device as claimed in any one of the preceding Claims, characterized in that the display device comprises a shadow mask.
Claim 9
Dependent Claim
23 words
A display device as claimed in any one of the preceding Claims, characterized in that the device is provided with a light valve.
Claim 10
Dependent Claim
24 words
A display device as claimed in any one of Claim 1 or 2, characterized in that cathode unit comprises the row of electron multipliers
Claim 11
Dependent Claim
37 words
A cathode unit for a display device as claimed in Claim 9, characterized in that the cathode unit comprises at least one cathode, deflection means for one or more electron beams and a row of electron multipliers.
Claim 12
Dependent Claim
18 words
A cathode unit as claimed in Claim 10, characterized in that the cathode unit comprises a semiconductor cathode.
Claim 13
Dependent Claim
27 words
A cathode unit as claimed in Claim 11, characterized in that the main surface of the semiconductor body extends substantially parallel to the row of electron multipliers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.