EP0464938A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Thin-type picture display device
Assignee: Koninklijke Philips NV
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Filing: 1991-06-28
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Granted: —
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Expires: 2011-06-28
Abstract
Abstract Flat, thin picture display device (1) having a transparent face plate (3) and a rear plate (4) and a large number of electron sources (5) and local electron transport ducts (11) cooperating therewith, a selection plate (10) arranged at a distance between the face plate (3) and the rear plate (4) having an arrangement of apertures (8) which defines locations for withdrawing electrons from the electron transport ducts (11) and, aligned therewith, a row of apertures defining locations for the electron sources.
Inventors
- 👤 Gerardus Gegorius Petrus Van Gorkom
- 👤 Petrus Hubertus Franciscus Trompenaars
- 👤 Siebe Tjerk De Zwart
- 👤 Nicolaas Lambert
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 19:38
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/123; H01J31/125; H01J31/126; H01J29/00; H01J29/02; H01J29/028; H01J2329/00; H01J2329/86; H01J2329/8625; H01J2329/863
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
161 words
A picture display device having a vacuum envelope with a transparent face plate whose inner surface is provided with a luminescent screen for displaying pictures composed of pixels and a rear plate connected to the face plate by means of partitions, said device comprising an arrangement of juxtaposed sources for producing electrons, local transport ducts cooperating with the sources and having walls of electrically substantially insulating material having a secondary emission coefficient suitable for transporting produced electrons in the form of electron currents, and first selectively energizable electrode means for withdrawing each electron current from its transport duct at predetermined extraction locations and directing them towards the luminescent screen for forming a picture composed of pixels, a selection plate system arranged at a distance between the front and rear walls by means of front and rear spacers having a main surface with an arrangement of apertures defining the extraction locations and, aligned therewith, a row of apertures defining electron source locations.
Claim 2
Dependent Claim
161 words
A picture display device having a vacuum envelope with a transparent face plate whose inner surface is provided with a luminescent screen for displaying pictures composed of pixels and a rear plate connected to the face plate by means of partitions, said device comprising an arrangement of juxtaposed sources for producing electrons, local transport ducts cooperating with the sources and having walls of electrically substantially insulating material having a secondary emission coefficient suitable for transporting produced electrons in the form of electron currents, and first selectively energizable electrode means for withdrawing each electron current from its transport duct at predetermined extraction locations and directing them towards the luminescent screen for forming a picture composed of pixels, a selection plate system arranged at a distance between the front and rear walls by means of front and rear spacers having a main surface with an arrangement of apertures defining the extraction locations and, aligned therewith, a row of apertures defining electron source locations.
Claim 3
Dependent Claim
38 words
A device as claimed in Claim 1, characterized in that the selection plate system has supporting means at its side facing the luminescent screen, which means support the arrangement of electron sources for cooperating with the transport ducts.
Claim 4
Dependent Claim
44 words
A device as claimed in Claim 1, characterized in that strip-shaped electron source drive electrodes are arranged on a main surface of the selection plate, each electrode having an aperture which is in alignment with one of the apertures defining the electron source locations.
Claim 5
Dependent Claim
61 words
A device as claimed in Claim 3, characterized in that the electron source arrangement is present proximate to an edge of the main surface and in that a strip-shaped electron source drive electrode arranged on the main surface is associated with each aperture defining an electron source location, which drive electrode extends from said aperture into the direction of said edge.
Claim 6
Dependent Claim
34 words
A device as claimed in Claim 4, characterized in that the edge at which the electron source arrangement is present extends beyond at least one of the partitions connecting the front and rear walls.
Claim 7
Dependent Claim
31 words
A device as claimed in Claim 1, characterized in that the apertures of adjacent transport ducts defining the extraction locations are arranged along parallel lines extending transversely to the transport ducts.
Claim 8
Dependent Claim
32 words
A device as claimed in Claim 6, characterized in that the front spacer comprises a system of mutually parallel walls extending between the apertures at an angle to the rows of apertures.
Claim 9
Dependent Claim
22 words
A device as claimed in Claim 6, characterized in that the walls of the system extend transversely to the rows of apertures.
Claim 10
Dependent Claim
59 words
A device as claimed in Claim 8, characterized in that each extraction location is defined by at least a first and a second aperture and in that the first selectively energizable electrode means comprise at least a first system of sub-electrodes for line-sequentially driving the first apertures and a second system of sub-electrodes for line-sequentially driving the second apertures.
Claim 11
Dependent Claim
46 words
A device as claimed in Claim 6, characterized in that the number of parallel rows is three times as large for colour display as the number of lines of a picture to be displayed and corresponds to the number of phosphor lines on the luminescent screen.
Claim 12
Dependent Claim
65 words
A device as claimed in Claim 1, characterized in that the selection plate system comprises two sub-selection plates which are spaced apart: one preselection plate facing the rear wall and having apertures defining the extraction locations and the electron source locations; and one fine selection plate facing the front wall and having at least two apertures associated with each extraction location in the preselection plate.
References Cited (Backward Citations)
US4069439A
Cited
EP0079108A2
Cited
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