GB1471911A - Visual display devices - Google Patents
Visual display devicesInfo
- Publication number
- GB1471911A GB1471911A GB595674A GB595674A GB1471911A GB 1471911 A GB1471911 A GB 1471911A GB 595674 A GB595674 A GB 595674A GB 595674 A GB595674 A GB 595674A GB 1471911 A GB1471911 A GB 1471911A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrodes
- cells
- grids
- grid
- parallel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/38—Cold-cathode tubes
- H01J17/48—Cold-cathode tubes with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron
- H01J17/49—Display panels, e.g. with crossed electrodes, e.g. making use of direct current
- H01J17/492—Display panels, e.g. with crossed electrodes, e.g. making use of direct current with crossed electrodes
- H01J17/494—Display panels, e.g. with crossed electrodes, e.g. making use of direct current with crossed electrodes using sequential transfer of the discharges, e.g. of the self-scan type
Landscapes
- Gas-Filled Discharge Tubes (AREA)
Abstract
1471911 Gas discharge display panel FERRANTI Ltd 7 Feb 1975 [8 Feb 1974] 05956/74 Heading H1D In a D.C. cathode gas discharge display panel with an array of cells 15<SP>1</SP>, in individual apertures or with insulated inter-cell connections in one large aperture, with electrodes CI1 &c., IR1 &c., on two faceplates in contact with the gas and parallel to respective co-ordinate axes, economy in drive circuitry is gained by introducing one (Fig. 2, not shown) or two auxiliary electrodes (grids) 1GC1 &c., 1GR1 &c. into each cell, connected in a set parallel to one axis or in two sets parallel respectively to the two axes. One set of electrodes, 1C1 &c., communicates directly with the cells, the other 1R1 &c. via individual current limiting resistors. The cells are divided into blocks, typically 5 + 7 for alphanumeric display, shown separated by chained lines. Hose electrodes if any without grids running parallel (IR1, &c. Fig. 1, not shown) have separate drive circuits for every electrode: those with parallel grids, i.e. both rows and columns in Fig. 3, connect all the first electrodes of one type in each block. 1C1, 2C1, 3C1 or 1R1, 2R1, 3R1 in common, all the second electrodes in common, &c. to respective drive units 14<SP>1</SP>, 11<SP>1</SP>. The grids to all cells of each block are connected in common for each direction provided 1CG &c., 1RG &c.: the voltage between the main electrodes is maintained between "sustain" and "triggering" levels and the grid(s) in each cell is/are set to intermediate levels which inhibit triggering for all blocks except those to be accessed. Pulses are applied to the main electrodes of the first column of each block and to all the required rows, or vice versa, to trigger the cells required in the accessed block; successive columns are then pulsed in turn together with appropriate row pulses; the cells remain lit as the column is stepped on. To erase, opposite pulses are applied to the main electrodes. The device is made from five layers assembled face to face, edge sealed and gas filled (Fig. 5, not shown), the first layer being transparent and carrying transparent (SnO) electrodes, the second and fourth being opaque perforated blanks, the third being opaque and perforated and carrying the crossed grid electrodes coated on opposite faces, with the inner edges of annular regions entering the apertures, and the fifth carrying electrodes transverse to those of the first, offset to one side of the apertures to allow for film resistors in series. Alternatively, the third plate may be a blank, with the second and fourth carrying respective grid electrodes. The single grid arrangement can then be adopted by omitting one of the grid plates. The blocks may be separated by lines of inactive cells used to supply starting ions to the neighbouring active cells. The grids may alternatively be made of wire. The device may be operated on either polarity. With two grids per cell characters are written separately to all blocks, but with only one grid and individual row drive circuits, all rows can be written simultaneously as the column is stepped forward, the economy in drive circuits being then limited to the columns only.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB595674A GB1471911A (en) | 1975-02-07 | 1975-02-07 | Visual display devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB595674A GB1471911A (en) | 1975-02-07 | 1975-02-07 | Visual display devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1471911A true GB1471911A (en) | 1977-04-27 |
Family
ID=9805796
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB595674A Expired GB1471911A (en) | 1975-02-07 | 1975-02-07 | Visual display devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1471911A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2190787A (en) * | 1986-05-21 | 1987-11-25 | Dr Brian Robert Pullan | Multiple sample radioactivity detector |
-
1975
- 1975-02-07 GB GB595674A patent/GB1471911A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2190787A (en) * | 1986-05-21 | 1987-11-25 | Dr Brian Robert Pullan | Multiple sample radioactivity detector |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |