US3882342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas discharge display panel for color picture reproduction
Assignee: Japan Broadcasting Corp
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Filing: 1974-07-30
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Granted: 1975-05-06
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Expires: 1994-07-30
Abstract
Abstract A gas discharge display panel for efficiently reproducing a color picture having high brightness and high definition. The display panel comprises a plurality of picture elements arranged in matrix. Each picture element is formed by a set of three discharge units reproducing red, green and blue light respectively. Each discharge unit is coupled to a hollow cathode. The hollow cathode of a suitable size is divided into two portions, i.e., a set of display hollow cathodes each of which forms main part of the discharge unit, and a scanning hollow cathode which couples the set of display hollow cathodes and operates for obtaining preparatory discharge. Said two portions of the hollow cathode are jointly operated so as to obtain a large discharge current supply at low voltage and in a small surface area. Thus a practical gas discharge display panel having high density discharge unit arrangement is realized and which is able to increase the luminance by about several tens of per cent more than the conventional one and also being able to be assembled in a simple manner by simplifying the panel construction with unified parts.
Inventors
- 👤 Takeo Kamegaya
- 👤 Yutaka Imahori
- 👤 Ryuichi Kaneko
- 👤 Minori Yokozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:45
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49; H01J17/492; H01J17/497
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
286 words
A gas discharge display panel comprising in combination; a front panel formed by transparent insulating material, a first intermediate insulating plate provided with a plurality of picture elements arranged in matrix shape, in which each picture element is formed by a set of three display discharge units for displaying three primary colors, red, green and blue, respectively, and each of the display discharge unit comprises a hollow display cathode, a number of display anode stripes extended in parallel and provided between the front panel and the first intermediate insulating plate, in which the display anode stripes are formed in groups for respective primary colors and each stripe being provided at a location to establish registration with respective row of said display discharge units for reproducing corresponding primary color, a second intermediate insulating plate provided with a plurality of hollow scanning cathodes, in which each hollow scanning cathode is provided at a position facing against said set of hollow display cathodes representing a picture element and each column of the hollow scanning cathodes are connected by a conductive stripe, a rear panel made of insulating material, and a plurality of scanning anodes provided in parallel on the rear panel in a direction normal to said conductive stripes, wherein the set of the hollow display cathodes and the hollow scanning cathode are so arranged as to overlap at through holes having small cross-sectional area so that a scanning discharge produced between the scanning cathode and the scanning anode can easily be transferred to the hollow display cathode forming the display discharge unit together with the display anode in a manner that the scanning discharge will not give substantial influence to a viewer located at the front panel side.
Claim 2
Dependent Claim
286 words
A gas discharge display panel comprising in combination; a front panel formed by transparent insulating material, a first intermediate insulating plate provided with a plurality of picture elements arranged in matrix shape, in which each picture element is formed by a set of three display discharge units for displaying three primary colors, red, green and blue, respectively, and each of the display discharge unit comprises a hollow display cathode, a number of display anode stripes extended in parallel and provided between the front panel and the first intermediate insulating plate, in which the display anode stripes are formed in groups for respective primary colors and each stripe being provided at a location to establish registration with respective row of said display discharge units for reproducing corresponding primary color, a second intermediate insulating plate provided with a plurality of hollow scanning cathodes, in which each hollow scanning cathode is provided at a position facing against said set of hollow display cathodes representing a picture element and each column of the hollow scanning cathodes are connected by a conductive stripe, a rear panel made of insulating material, and a plurality of scanning anodes provided in parallel on the rear panel in a direction normal to said conductive stripes, wherein the set of the hollow display cathodes and the hollow scanning cathode are so arranged as to overlap at through holes having small cross-sectional area so that a scanning discharge produced between the scanning cathode and the scanning anode can easily be transferred to the hollow display cathode forming the display discharge unit together with the display anode in a manner that the scanning discharge will not give substantial influence to a viewer located at the front panel side.
Claim 3
Dependent Claim
23 words
A gas discharge display panel according to claim 1, wherein the display anode stripes are provided on inner surface of the front panel.
Claim 4
Dependent Claim
25 words
A gas discharge display panel according to claim 1, wherein the display anode stripes are provided on front surface of the first intermediate insulating plate.
Claim 5
Dependent Claim
31 words
A gas discharge display panel according to claim 1, wherein the hollow scanning cathodes are connected at part of its rEar side by slots provided in said second intermediate insulating panel.
Claim 6
Dependent Claim
41 words
A gas discharge display panel according to claim 1, wherein a cross-section of the scanning hollow cathode shows three outwardly projecting grooves and each groove overlaps with one of the hollow display cathode in its cross-section to form a through hole.
Claim 7
Dependent Claim
62 words
A gas discharge display panel according to claim 5, wherein cross-sectional area Sg of the through holes of a hollow scanning cathode is selected with respect to mean free path of electron of sealed gas and cross-sectional area Sd of the hollow display cathode in a range of following equation, pi /4(15 lambda e)2 < or = Sg < or = (Sd/3).
Claim 8
Dependent Claim
69 words
A gas discharge display panel according to claim 5, wherein the cross-sectional area Sd of the hollow display cathode and length L of the same are selected with respect to diameter D of a circle having corresponding area Sd and with the electron mean free path lambda e in a range defined by the following equation, 15 < D/ lambda e < 150 and 2 < D/L < 15.
Claim 9
Dependent Claim
28 words
A gas discharge display panel according to claim 1, wherein said sets of hollow display cathodes are arranged in lateral to vertical pitch ratio between 0.87 to 1.15.
Claim 10
Dependent Claim
35 words
A gas discharge display panel according to claim 8, wherein said hollow display cathodes are made in a form selected from circle, oblong circle, elongated square shape and being made in substantially same cross-sectional area.
Claim 11
Dependent Claim
36 words
A gas discharge display panel according to claim 9, wherein said hollow scanning cathodes are obliquely connected in a group corresponding to even number row by said slot so as to cause zigzag shaped interlaced scanning.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |