EP0328079A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Flat CRT display apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1989-02-08
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Granted: —
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Expires: 2009-02-08
Abstract
Abstract A flat CRT display apparatus has a set of vertical scanning deflection electrodes (11) arrayed down one flat inner face (9) of the CRT, spaced apart from an opposing face (12) having a photo-emissive layer (10) formed thereon, and an electron gun (23) for emitting a single flat electron beam or a row of narrow line electron beams into the space between the scanning electrodes and the photo-emissive layer. Vertical scanning of a raster display is executed by scanning voltages successively applied to the scanning electrodes, with the deflected electron beams thus obtained being then horizontally swept in common by a horizontal deflection electrode, so that each electron beam is utilized to display a large number of picture elements of each horizontal scanning line of the display picture.
Inventors
- 👤 Hiroshi Miyama
- 👤 Yoshikazu Kawauchi
- 👤 Kaoru Tomii
- 👤 Jun Nishida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 03:58
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/123; H01J31/124; H04; H04N; H04N9/00; H04N9/12
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
252 words
A flat cathode ray tube display apparatus comprising: an evacuated envelope having flat mutually opposing first and second portions, with at least said first envelope portion being optically transparent and having a photo-emissive layer of a fluroescent material formed over a rectangular region of an inner surface of said first envelope portion, said rectangular region having respective sides thereof extending in a horizontal and a vertical direction, and with a set of vertical scanning deflection electrodes formed a elongated conductive strips arrayed with a fixed pitch upon an inner surface of said second envelope portion; an electron gun disposed within said envelope, extending between said first and second envelope portions, for emitting an electron beam into a region between said vertical scanning deflection electrodes and photo-emissive layer and for forming said electron beam as a thin flat sheet aligned substantially parallel to said photo-emissive layer; means for applying scanning voltages to said vertical scanning deflection electrodes for producing deflection of said electron beam towards said photo-emissive layer by successive ones of said vertical scanning deflection electrodes; shield electrode means disposed between said vertical scanning deflection electrodes and photo-emissive layer, for converting said thin sheet electron beam to a corresponding plurality of thin line electron beams directed towards said photo-emissive layer, subsequent to deflection by said vertical scanning deflection electrodes; modulation electrode means for modulating respective ones of said plurality of electron beams; and, deflection electrode means for periodically deflecting said plurality of electron beams together, following modulation by said modulation electrode means.
Claim 2
Dependent Claim
252 words
A flat cathode ray tube display apparatus comprising: an evacuated envelope having flat mutually opposing first and second portions, with at least said first envelope portion being optically transparent and having a photo-emissive layer of a fluroescent material formed over a rectangular region of an inner surface of said first envelope portion, said rectangular region having respective sides thereof extending in a horizontal and a vertical direction, and with a set of vertical scanning deflection electrodes formed a elongated conductive strips arrayed with a fixed pitch upon an inner surface of said second envelope portion; an electron gun disposed within said envelope, extending between said first and second envelope portions, for emitting an electron beam into a region between said vertical scanning deflection electrodes and photo-emissive layer and for forming said electron beam as a thin flat sheet aligned substantially parallel to said photo-emissive layer; means for applying scanning voltages to said vertical scanning deflection electrodes for producing deflection of said electron beam towards said photo-emissive layer by successive ones of said vertical scanning deflection electrodes; shield electrode means disposed between said vertical scanning deflection electrodes and photo-emissive layer, for converting said thin sheet electron beam to a corresponding plurality of thin line electron beams directed towards said photo-emissive layer, subsequent to deflection by said vertical scanning deflection electrodes; modulation electrode means for modulating respective ones of said plurality of electron beams; and, deflection electrode means for periodically deflecting said plurality of electron beams together, following modulation by said modulation electrode means.
Claim 3
Dependent Claim
25 words
A display apparatus according to claim 1, in which said deflection electrode means functions to deflect said plurality of electron beams in said horizontal direction.
Claim 4
Dependent Claim
30 words
A display apparatus according to claim 1, in which said deflection electrode means functions to deflect said plurality of electron beams in said horizontal direction and in said vertical direction.
Claim 5
Dependent Claim
72 words
A display apparatus according to claim 1, in which said shield electrode means comprises a shield electrode of flat shape which is disposed parallel to said photo-emissive layer between said modulation electrode means and said vertical scanning deflection electrodes, having a plurality of apertures formed therein for shaping respective ones of said plurality of electron beams, said apertures being spaced apart with a fixed pitch and respectively elongated in said vertical direction.
Claim 6
Dependent Claim
50 words
A display apparatus according to claim 4, in which said modulation electrode means comprises a plurality of mutually electrically isolated electrode sections provided with apertures elongated in said vertical direction and positioned to permit passage of respective ones of said plurality of electron beams produced from said shield electrode means.
Claim 7
Dependent Claim
64 words
A display apparatus according to claim 2, in which said deflection electrode means comprises an opposed pair of horizontal deflection electrode members shaped to define a plurality of elongated regions each extending in said vertical direction and respectively positioned in correspondence with to said elongated apertures of the shield electrode, and means for applying a periodically varying horizontal deflection voltage between said electrode members.
Claim 8
Dependent Claim
116 words
A display apparatus according to claim 3, in which said deflection electrode means comprises an opposed pair of horizontal deflection electrode members shaped to define a plurality of elongated regions each extending in said vertical direction and respectively positioned in correspondence with said elongated apertures of the shield electrode, and means for applying a periodically varying horizontal deflection voltage between said electrode members, and an opposed pair of vertical deflection electrode members shaped to define a plurality of elongated regions each extending in said horizontal direction and respectively positioned to receive said plurality of electron beams at successive positions along said vertical direction which are respectively defined by deflection operation of said vertical scanning deflection electrodes
Claim 9
Dependent Claim
56 words
A display apparatus according to claim 1 in which said pitch of the vertical scanning deflection electrodes is identical to a pitch of horizontal scanning lines of a display picture produced by said apparatus, and in which said vertical scanning deflection electrodes are substantially equal in number to a total number of said horizontal scanning lines.
Claim 10
Dependent Claim
95 words
A display apparatus according to claim 1, in which said scanning voltages are sequentially varied in amplitude for a plurality of successive horizontal scanning intervals of a display picture produced by said apparatus, to implement successive deflection of said thin sheet electron beam by each of said vertical scanning deflection electrodes to a plurality of successive horizontal scanning line positions of said picture, and in which said vertical scanning deflection electrodes are made substantially equal in number to 1/n times a total number of horizontal scanning lines of said picture, where n is an integer.
Claim 11
Dependent Claim
92 words
A display apparatus according to claim 1, in which said modulation means are modulated in accordance with a field interlace video signal, and in which said scanning voltages are sequentially varied in amplitude between a first field and a second field of said video signal, to implement deflection of said thin sheet electron beam by each of said vertical scanning deflection electrodes to a first trajectory during said first field and a second trajectory which is vertically displaced from said first trajectory, during said second field, to thereby implement interlace scanning operation.
Claim 12
Dependent Claim
66 words
A display apparatus according to claim 1, in which said electron gun comprises a focus electrode comprising two opposing elongated electrode sections between which is passed said thin sheet electron beam, said focus electrode having a fixed common potential applied to said electrode sections for focussing said electron beam and having a differential potential applied between said electrode sections, for position adjustment of said electron beam.
Claim 13
Dependent Claim
93 words
A display apparatus according to claim 11, in which said differential voltage is sequentially varied for a plurality of successive horizontal scanning intervals of a display picture produced by said apparatus, to implement successive deflection of said thin sheet electron beam by each of said vertical scanning deflection electrodes to a plurality of successive horizontal scanning line positions of said picture, and in which said vertical scanning deflection electrodes are made substantially equal in number to 1/n times a total number of horizontal scanning lines of said picture, where n is an integer.
Claim 14
Dependent Claim
90 words
A display apparatus according to claim 11, in which said modulation means are modulated in accordance with a field interlace video signal, and in which said differential voltage is sequentially varied between a first field and a second field of said video signal, to implement deflection of said thin sheet electron beam by each of said vertical scanning deflection electrodes to a first trajectory during said first field and a second trajectory which is vertically displaced from said first trajectory, during said second field, to thereby implement interlace scanning operation.
Claim 15
Dependent Claim
66 words
A display apparatus according to claim 1, in which said electron gun comprises a line cathode, and further comprising a supporting member and retaining means for supporting and retaining said line cathode, said retaining means holding said line cathode in contact with a surface of said supporting member, said surface being formed with a contour of convex curvature which is substantially an arc of a circle.
Claim 16
Dependent Claim
19 words
A display apparatus according to claim 14, in which said convex contour surface is further formed with undulations therein.
Claim 17
Dependent Claim
46 words
A display apparatus according to claim 14, in which said supporting member is formed of an electrically insulating material, and further comprising a film of electrically conductive material formed over a region of said convex contour surface which is placed in contact with said line cathode.
Claim 18
Dependent Claim
56 words
A display apparatus according to claim 14, in which said supporting member is formed of an electrically insulating material, and further comprising a film of electrically conductive material formed over a region of said convex contour surface which is closely adjacent to a region of said surface that is placed in contact with said line cathode.
Claim 19
Dependent Claim
45 words
A display apparatus according to claim 14, in which said supporting member is formed of a metal, and further comprising a layer of an electrically insulating material formed over a region of said convex contour surface which is placed in contact with said line cathode.
Claim 20
Dependent Claim
51 words
A display apparatus according to claim 14 in which said line cathode comprises a length of metal wire having a surface layer of a cathode oxide material formed thereon, in which said cathode oxide layer is restricted to a region of said line cathode which does not contact said supporting member.
Claim 21
Dependent Claim
232 words
A flat cathode ray tube display apparatus comprising: an evacuated envelope having flat mutually opposing first and second portions, with at least said first envelope portion being optically transparent and having a photo-emissive layer of a fluroescent material formed over a rectangular region of an inner surface of said first envelope portion, said rectangular region having respective sides thereof extending in a horizontal and a vertical direction, and with a set of vertical scanning deflection electrodes formed as elongated conductive strips successively arrayed with a fixed pitch upon an inner surface of said second envelope portion; an electron gun disposed within said envelope, extending between said first and second envelope portions for emitting a plurality of electron beams, each of thin linear shape, into a region between said vertical scanning deflection electrodes and photo-emissive layer said electron beams being each aligned in said vertical direction and successively arrayed along said horizontal direction with a fixed pitch; means for applying scanning voltages to said vertical scanning deflection electrodes for producing a common deflection of said electron beams towards said photo-emissive layer by successive ones of said vertical scanning deflection electrodes; modulation electrode means for modulating respective ones of said plurality of electron beams; and, deflection electrode means for periodically deflecting said plurality of electron beams together to sweep said electron beams across said photo-emissive layer, following deflection by said vertical scanning deflection electrodes.
Claim 22
Dependent Claim
232 words
A flat cathode ray tube display apparatus comprising: an evacuated envelope having flat mutually opposing first and second portions, with at least said first envelope portion being optically transparent and having a photo-emissive layer of a fluroescent material formed over a rectangular region of an inner surface of said first envelope portion, said rectangular region having respective sides thereof extending in a horizontal and a vertical direction, and with a set of vertical scanning deflection electrodes formed as elongated conductive strips successively arrayed with a fixed pitch upon an inner surface of said second envelope portion; an electron gun disposed within said envelope, extending between said first and second envelope portions for emitting a plurality of electron beams, each of thin linear shape, into a region between said vertical scanning deflection electrodes and photo-emissive layer said electron beams being each aligned in said vertical direction and successively arrayed along said horizontal direction with a fixed pitch; means for applying scanning voltages to said vertical scanning deflection electrodes for producing a common deflection of said electron beams towards said photo-emissive layer by successive ones of said vertical scanning deflection electrodes; modulation electrode means for modulating respective ones of said plurality of electron beams; and, deflection electrode means for periodically deflecting said plurality of electron beams together to sweep said electron beams across said photo-emissive layer, following deflection by said vertical scanning deflection electrodes.
Claim 23
Dependent Claim
26 words
A display apparatus according to claim 20, in which said deflection electrode means functions to periodically deflect said plurality of electron beams in said horizontal direction.
Claim 24
Dependent Claim
31 words
A display apparatus according to claim 20, in which said deflection electrode means functions to periodically deflect said plurality of electron beams in said horizontal direction and in said vertical direction.
Claim 25
Dependent Claim
67 words
A display apparatus according to claim 20, and further comprising a shield electrode of flat shape which is disposed parallel to said photo-emissive layer between said deflection electrode means and said vertical scanning deflection electrodes, having a plurality of apertures formed therein which are respectively elongated in said vertical direction and spaced apart with a fixed pitch, for allowing passage of respective ones of said electron beams.
Claim 26
Dependent Claim
51 words
A display apparatus according to claim 20, in which said electron gun includes a line cathode, and in which in which said modulation electrode means comprises a plurality of mutually electrically isolated electrode sections disposed adjacent to and directly below said line cathode, at positions respectively corresponding to said electron beams.
Claim 27
Dependent Claim
62 words
A display apparatus according to claim 20, in which said deflection electrode means comprises an opposed pair of horizontal deflection electrode members shaped to define a plurality of elongated regions each extending in said vertical direction and positioned to permit passage of respective ones of said electron beams, and means for applying a periodically varying horizontal deflection voltage between said electrode members.
Claim 28
Dependent Claim
128 words
A display apparatus according to claim 22, in which said deflection electrode means comprises an opposed pair of horizontal deflection electrode members shaped to define a plurality of elongated regions each extending in said vertical direction and positioned to permit passage of respective ones of said electron beams, means for applying a periodically varying horizontal deflection voltage between said electrode members, an opposed pair of vertical deflection electrode members shaped to define a plurality of elongated regions each extending in said horizontal direction and respectively positioned to receive said plurality of electron beams at successive positions along said vertical direction which are respectively defined by deflection operation of said vertical scanning deflection electrodes, and means for applying a periodically varying vertical deflection voltage between said vertical deflection members.
Claim 29
Dependent Claim
56 words
A display apparatus according to claim 20 in which said pitch of the vertical scanning deflection electrodes is identical to a pitch of horizontal scanning lines of a display picture produced by said apparatus, and in which said vertical scanning deflection electrodes are substantially equal in number to a total number of said horizontal scanning lines.
Claim 30
Dependent Claim
95 words
A display apparatus according to claim 20, in which said scanning voltages are sequentially varied in amplitude for a plurality of successive horizontal scanning intervals of a display picture produced by said apparatus, to implement successive deflection of said thin sheet electron beam by each of said vertical scanning deflection electrodes to a plurality of successive horizontal scanning line positions of said picture, and in which said vertical scanning deflection electrodes are made substantially equal in number to 1/n times a total number of horizontal scanning lines of said picture, where n is an integer.
Claim 31
Dependent Claim
91 words
A display apparatus according to claim 20, in which said modulation means is modulated in accordance with a field interlace video signal, and in which said scanning voltages are sequentially varied in amplitude between a first field and a second field of said video signal, to implement common deflection of said electron beams by each of said vertical scanning deflection electrodes to a first trajectory during said first field and a second trajectory which is vertically displaced from said first trajectory, during said second field, to thereby implement interlace scanning operation.
Claim 32
Dependent Claim
71 words
A display apparatus according to claim 20, in which said electron gun comprises a focus electrode comprising two opposing elongated electrode sections between which is passed said thin sheet electron beam, said focus electrode having a fixed common potential applied to said electrode sections for focusing said electron beam and having a differential potential applied between said electrode sections, said differential potential being variable for position adjustment of said electron beam.
Claim 33
Dependent Claim
93 words
A display apparatus according to claim 30, in which said differential potential is sequentially varied for a plurality of successive horizontal scanning intervals of a display picture produced by said apparatus, to implement successive deflection of said thin sheet electron beam by each of said vertical scanning deflection electrodes to a plurality of successive horizontal scanning line positions of said picture, and in which said vertical scanning deflection electrodes are made substantially equal in number to 1/n times a total number of horizontal scanning lines of said picture, where n is an integer.
Claim 34
Dependent Claim
89 words
A display apparatus according to claim 30, in which said modulation means is modulated in accordance with a field interlace video signal, and in which said differential voltage is sequentially varied between a first field and a second field of said video signal, to implement common deflection of said electron beams by each of said vertical scanning deflection electrodes to a first trajectory during said first field and a second trajectory which is vertically displaced from said first trajectory, during said second field, to thereby implement interlace scanning operation.
Claim 35
Dependent Claim
66 words
A display apparatus according to claim 20, in which said electron gun comprises a line cathode, and further comprising a supporting member and retaining means for supporting and retaining said line cathode, said retaining means holding said line cathode in contact with a surface of said supporting member, said surface being formed with a contour of convex curvature which is substantially an arc of a circle.
Claim 36
Dependent Claim
19 words
A display apparatus according to claim 33, in which said convex contour surface is further formed with undulations therein.
Claim 37
Dependent Claim
46 words
A display apparatus according to claim 33, in which said supporting member is formed of an electrically insulating material, and further comprising a film of electrically conductive material formed over a region of said convex contour surface which is placed in contact with said line cathode.
Claim 38
Dependent Claim
56 words
A display apparatus according to claim 33, in which said supporting member is formed of an electrically insulating material, and further comprising a film of electrically conductive material formed over a region of said convex contour surface which is closely adjacent to a region of said surface that is placed in contact with said line cathode.
Claim 39
Dependent Claim
45 words
A display apparatus according to claim 33, in which said supporting member is formed of a metal, and further comprising a layer of an electrically insulating material formed over a region of said convex contour surface which is placed in contact with said line cathode.
Claim 40
Dependent Claim
52 words
A display apparatus according to claim 33 in which said line cathode comprises a length of metal wire having a surface layer of a cathode oxide material formed thereon, and in which said cathode oxide layer is restricted to a region of said line cathode which does not contact said supporting member.
References Cited (Backward Citations)
No citation records indexed.
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