US2925530A

US2925530A - Luminous display device

Info

Publication number: US2925530A
Application number: US624799A
Authority: US
Inventors: Douglas C Engelbart
Original assignee: Digital Technology Inc
Current assignee: Digital Technology Inc; Digital Techniques Inc
Priority date: 1956-11-28
Filing date: 1956-11-28
Publication date: 1960-02-16
Anticipated expiration: 1977-02-16

Description

2 Sheets-Sheet l 17 R." O, m7 v", mi Af u 7 W D. C. ENGELBART LUMINoUs DISPLAY DEVICE ,L ze imm Aww Feb. 16, 1960 Filed Nov. 28. 1956 Feb. 16, 1960 D. c. ENGELBART 2,925,530

LUMINOUS DISPLAY DEVICE Filed Nov. 28, 1956 /f 8 a (fr Y,

2 Sheets-Sheet 2 United States Patent O 2,925,530 LUMINOUS DISPLAY DEVICE Douglas .C. Engebart, Oakland, Calif., assignor to Digital Techniques, Inc., Berkeley, Calif., a corporation of Cahforuia Application November 28, 1956, Serial No. 624,799

7 Claims. (Cl. 315 84.6)

.The invention relates to visual character display devices, and, more particularly, to such devices of the serial shifting, multiple position, glow discharge type as disclosed in my copending applications:

Electric Controlled Infomationbearing Device.

Glow Dicharge Device.

lh emory Device.

Aview while another whole pattern is shifted into the device for similar subsequent showing.

4The invention possesses other objects and features of advantage, some of which, with the foregoing, will be set forth in the following description of the preferred form of the invention which is illustrated in the drawing accompanying and forming part of the specification. lt is understood, however, that variations in the showing made by said drawing and description may be adopted within the scope of the invention as set forth in the claims.

Referring to said drawings:

Figure l is a plan view of a luminous display device constructed in accordance with the present invention.

Figure 2 is a cross-sectional view, on a somewhat enlarged scale, of the device and is taken substantially on the plane of line 2 2 of Figure l.

Figure 3 is a cross-sectional view similar to Figure 2 but is taken on the plane of line 3 3 of Figure l.

Figure 4 is a cross-sectional view, on the enlarged scale, taken substantially on the plane of line 4 4 of Figure 1.

Figure 5 is a plan view of a modified form of luminous display device.

Figure 6 is a cross-sectional view taken substantially on the plane of line 6 6 of Figure 5.

Figure 7 is a cross-sectional view, similar to Figure. 6, taken substantially on the plane of line 7-7 of Figure 5. Figure 8 is a cross-sectional view of the device taken substantially on the plane of line 8 8 of Figure 5.

The luminous display device ofthe present invention consists brieily of a serial shifting register of the glow disc harge type, such -as is more fully disclosed in my copending applications aforesaid, and which has a gaseous discharge channel, see the cross-sectional view, Figure 3, of the drawings, made up of a plurality of longitudinally spaced

luminous station cells

11, 12, 13, 14, 15, 16 and 17, and intermediate shifting

cells

21, 22, 23, 24, 25 and 26arranged to shift glow discharges between the station cells 11-17, the arrangement being particularly characterized in the forming of the station cells 11-17 of substantially enlarged size in respect to, and in comparison with, the shifting cells 21-26, whereby the station, or display, cells are brought closer together and provide maximum luminosity for improved resolution and display effect. This is here accomplished by making the gas discharge channel, as seen in Figure 3, of undulating cross section` with wide and deep portions of the channel forming the display cells 11-17 and shallow and narrow portions of the channel forming the shifting cells 2126. Where a three-line serial shifting register is used, as here proposed, the intermediate shifting cells are each divided into two shifting cells lying between each adjacent pair of display cells, and an electrode is associated with each of these cells. Thus, a plurality of

electrodes

31, 32, 33, 34, 35, 36 and 37 are associated with the display cells 11-17 and, when energized, will sustain a discrete glow discharge in the display cells; and a plurality of

electrodes

41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51 and 52 are asso ciated with the glow shifting cells 21-26, and are effective, when sequentially energized, to shift discrete glow discharges from display cell 11 through the intermediate shifting passage 2.1 to cell 12, and then through the intermediate shifting passage 22 to cell 13, and similarly through intermediate shifting passage 23 to cell 14, shifting passage 24 to cell 15, shifting passage 25 to cell 16, and finally through shifting passage 26 to cell 17.

Electrodes 31-37 and 41-52 are here energized with respect to a plurality of

ground electrodes

56, 57, 58, 59, 60, 61, 62 and 63 so as to sustain localized discrete glow discharges within the several cells, the amount of excitation being kept below the breakdown voltage of the gas in the cells and above the extinction voltage of glow discharge so that the excitation is suflicient to sustain a glow discharge once introduced into the cells. Another phe nomenon used in the shifting register technique is that of priming one cell adjacent to a cell containing a glow discharge. The glow discharge in one cell will effect a partial ionization in an adjacent cell suflicient to enable the operating voltage to produce a glow discharge in the adjacent cell when the operating voltage is applied. This characteristic enables a transfer of the glow discharge from one cell to an adjacent cell.

The foregoing is illustrated in Figure 3 of the drawings by glow areas marked a, b and c. On energizing of electrode 31, a large glow area a is produced due to the electric field established by electrode 31 and

ground electrodes

56 and 57. The glow discharge in the main large display area a, will prime, so to speak, the adjacent glow area b immediately adjacent to electrode 41 at the shift passage 21. Thus if the operating voltage is turned off from electrode 31 and has theretofore been, or is immediately thereafter, turned on at electrode 41, the large glow discharge a will decay and disappear and a smaller glow discharge b, due to the electric iield between electrode 41 and ground electrode 57, will appear. In a similar manner, glow discharge b will prime the adjacent transfer cell, represented here by glow discharge area' c, so that upon turning off the operating voltage from electrode 41 and turning it on at electrode 42 the glow discharge will decay at area b and be transferred to, and established in, area c which is here the localized electric iield between electrode 42 and ground electrode 57. In this manner, the glow discharge may be successively shifted from display cell 11 through the shifting passage 21 through area c at electrode 42 in position to prime theglow discharge in the next display cell 12. For convenience, the electrodes 31-37 may be connected to a common conductor, here marked Va, for joint excitation;

electrodes

4l, 43, 45, 47, 49 and 51 may be connected by a common conductor, here denoted Vb, for common excitation; and

electrodes

42, 44, 46, 48, 50 and 52 may be connected to a corn'rnon conductor, here denoted Vo,

common excitation.A ylfthen, the voltages Va, Vb and. Vc areA sequentially applied, the glow or no-glow condition in each of the display cells 11-17 will be successively shifted to the right, as seen in Figure 3, that is, the 'glow' or-'no'fglow-v condition in cell 11 will be shifted t o cell' 12l and', similarly, the glow or no-glow condition incell' 12 will be shifted to cell' 13, etc.

AsV will beobserved from Figure l, the device of' the present: invention is: composed' of a bank, or plurality, of; shifting registers'of! the type above described, thc particular arrangement, as here illustrated, being one having a` bank of-iive parallel serial shifting registers, here denotedA by numerals I', II, I-II, IV and V, each composed of seven display cells viz., cells-11717 as above described.

As'another feature of the present invention, the pattern off glows and no-glows to be introduced into the bank of shiftingregister I'V is here accomplished by the use of another serial shifting-register of'the glow discharge type having a glow servicing gaseous discharge channel 66 connected atlongitudinally spaced positions to channels I-V, and' which is provided with av plurality of electrodes 67 (see- Fig. 3) arra-yed along the servicing channel to sustain discrete glowdischarges at, and for shifting such glow discharges between, the longitudinally spaced positions-for-establishing-glow discharges in the channels I-'V'. A pairof glow startingelectrodes 68 are provided at one-end? of: the servicing channel 66 for initiatingglow discharge therein, it being understood thatglowdischarges initiated" by` electrodesl 68 may thereafter be shifted by the-shifting register technique along channel 66 and into registration with the connecting ends of channels lI-V for priming the first entrance cell, here identified as cell c, ina shifting passage 69 connecting the glow servicing channel' 66 with therst display cell 11. As will be understood, a glow discharge maybe set in display cell 11 byfmoving'a glow'discharge in channel 66 to passage- 69 and-then exciting electrode 70 associated with passage 69 at` the cell 11 sideof ground electrode 56. Electrode 70 i'svhere connected to V2, so that the setting of the glow discharge c at electrode 70 will' take place simultaneously with the transfer ofthe glow or no-glow discharge condition from the transfer passage 21 to glow area c associated with electrode 42. The foregoing arrangement thus provides for optionally shifting glow discharges from thel glowv servicing channel 66 through the several laterally extending channels 69 to the iirst cell of' the bank of serial shiftingv registers IV.

The several parts of the device are conveniently assembledfwithin an envelope 72, preferably'of' glass, and' containing an ionizable gas such as neon, at a pressure of approximately 15mm. Hg. The several cells and channels are here formed by a grid composed olfv a plurality of elongated' spaced metallic strips, heretofore denoted as ground'electrodes 56-63, and a plurality of elongated spaced

dielectric strips

73, 74, 75, 76', 77 and' 78 which are mounted' across the metallic strips and cooperate with one side 79 of the envelope to form a grid of luminous display cells as depicted by cells` 11-17 in theseveral serial shifting registers I-V'. The strips maybe formed with interlitting recesses to afford' an egg-crate" YPe 0f assembly as here illustrated. The displayu electrodes 31,-37 are here in the form of elongated' metal stripswhich are mounted through aligned openings in the dielectric members '73-78 between and substantially parallel to the4 ground electrodes 56-63.

The several shifting passages 21-26' and 69 are here formed by openings through the metal strips 56-63 to thus establish the several rows of gaseous discharge channels. I-V' between the several dielectric strips 73-78. A base member 82 of dielectric material is here mounted under the metallic and dielectric strips to provide a support for the electrodes 41-52 and 70, as well as to assist in part in the definition ofthe glow servicing channel 66. The glow shifting electrodes for each of the cells in each oij bank of registers l-V, being

electrodes

41, 43, 45,1

. discharges;

47, 49, and 51 in each of the banks, are connected together`

byv conductors

86, 87, 88, 89, 91 and 92 within the envelope to a common conductor brought out of the envelope and identified as Vb. In a similar manner all of the other glow shifting electrodes, being

electrodes

42, 44, 46, 48, 5 0, 52 and 70, for all of the bank of registers I-V' are connected by

conductors

96, 97, 98, 99; 100,- 101' andf102 withinthe envelope to a common conductor which is broughtv out of' the envelope, as conductor Vc as above explained.v i

The glow servicing channell 66 's here formed'l by the mounting within the envelope 72 between an end wall 106 and the ground electrode 5 6, an elongatedimember 107 of dielectric material which is spaced from the, underlying portion 108 of' the base member 8.2. so, as` to define the open channel 66 which is thus bounded by the. endrwall 106, member 107, electrode strip 5'6, and'portion 108 of the base member. Communication betweenf the glow servicing channel 66 and the first cell 11 of each of the bank of registers I-V is here effected by the series` of openings 69' provided; iu, longitudinally spaced' relation in the elongated strip 56. rI 'he electrodes 6 7- forthis auxiliary shiftingE registerl channel' 66 may be mounted exteriorly ci" the envelope on the end wall- 106, as here shown, and these electrodes may be connected by conductors 111', 112' and' 113 to excitation voltages denoted as. A, B; and G'. in. conformity. with thez three-line seria-l shifting-register practice asabove explained'i The excitation voltages A, B andC'and-Vg, V5, andV@l are derived` froml RJF. generators, preferably: havi'ng afrequency in the, orderof l20: to- 25; megacycles per secondE and a' magni'- uideaof up to.15;0. voltsReLMaS.'

A modified form of the invention is illustrated in-Big urcs: S- to 8 of.` the drawings whereiny a whole display pattern may be fedl into, one or a pluralityof" shifting registers andi their transferred en masse into a plurality of displayA cells, where the: visual pattern may be held' as longv asA desired', andi while another whole pattern may be shifted into the device for-similar-subsequentshowing. This device consists, briefly, of? a7 serial shifting1 register, including gaseous discharge channelx 116'?, as seenl in Figure 61, and; electrodes 11-7-V arrayed along the channelY to sustainA and shift discreteglowr discharges at and' between longitudinallyspacedf cells in the channelZ opposite every thirdl electrode,- as obtained in a three-line serial' shifting register, it being' noted thatl electrodes 1'11 are here connectedv toA operating voltages A, B) and C as above explained. Means'are-.provided'i at each of these cells for alordinglaterally extendingy gaseous

discharge channels

121i, 122, 123, 124, 1 25, 126 and 127 formed' with

luminous display cells

131, 132, 133, 134, 135, 1'36 and 137, and electrodes are associated with these laterally extending channels and display cells for optionally shifting glowfdischarges from channel-116' to the display cells 131-137, and: viceversa.

The device illustrated in Figures Sr to 8' is here constructed', as in thepreferred embodiment, to provide a bank or grid of display'cells-such as the 5' xv 7'I gridY here depicted. This grid is mounted within an envelope 141 containing ion-izabl'e gas, asi-n the first embodiment, and is here supported on aninternal dielectric partition member 142. The grid, similar-'to the f irst embodiment, i

is composed of a pluralityl of

metallic strips

146, 1,47, 148, 149, 150, 151, 152 and 1,53 (see F-ig.- 7") and a plurality of elongated spaced

dielectric strips

156', 157, 158, 15,9, 160 and 161 ('see Fig. 8)' mounted across the metallic stripsV to form rows I, I'I, III, IV' and V- of luminous display cells 131-137 ('see Fig. 6'), which are'capableon excitation of the metallic strips 146-153 to sustain glow formed with a plurality of gaseous discharge channels 1'16 which run parallel tothe rows LV, andthe partition member is formed with openings (-'providi'ng the lateral channels 121-127) at each of' the display cells connecting the display cells in all of the rows I-V with The under side of the partition 142' isthe underlying shift register channels 116. As will be observed, the display cells are bounded on opposite sides by the metallic electrode strips 146-153 and excitation for the cells may be provided by connecting the strips 146-153 to two phase R.F. voltage of the magnitude and frequency hereinabove noted. Every

second strip

146, 148, 150 and 152 is connected within the envelope to a common conductor 164 which is brought out of the envelope for connecton to an R.F. voltage source, here denoted ea. In a similar manner,

electrodes

147, 149, 151 and 153 are connected within the envelope to a common conductor 165 which is brought out of the envelope for connection to R.F. voltage source eb. R.F. voltages ea and eb thus energize all of the display cells 131-137 (Fig. 6) for sustaining glow discharges when introduced through transfer channels 121-127. To effect this transfer, a series of

electrodes

171, 172, 173, 174, 175, 176 and 177 are mounted at each of the transfer openings of channels 121-127 for shifting glow discharges from the underyling shift register channels 116. All of the electrodes 171-177 may be connected together, as here illustrated, within the envelope 141, and brought out by way of conductor 180 for connection to an R.F. generator supplying an operating voltage of the magnitude and frequency above discussed. Each of the shift register channels 116 is provided at one end with a glow setting electrode 181 which may be energized at a potential over breakdown voltage (with respect to ground electrode 182) for introducing glow discharges into the shift register channels.

The transfer electrodes 117 for the several channels 116 of the serial shifting registers may be mounted on the outside of the envelope opposite the channels, and since the channels are in spaced parallel relation, the electrodes 117 may be conveniently formed as elongated strips set perpendicular to the channels so that the several electrodes 117 extend across all of the channels 116. To cooperate with these electrodes in establishing localized electric lields to sustain and shift discrete glow discharges, there is provided in the partition member 142 at each of the channels 116 an elongated ground electrode 182.

The operation of the form of device illustrated in Figures to 8 may be briefly summarized as follows. A glow, no-glow, discharge pattern is fed into the channels 116 of each of the serial shifting registers I-V by conventional shift-register practice, thus disposing a desired glow or no-glow at each of the transfer channels 121-127 at each of the display cells 131-137 of each of the row or bank of cells I-V. R.F. excitation is then applied to metallic electrode strips 146-153. The glow or no-glow pattern then in the shift registers may be transferred en masse to the display cells by momentarily energizing the transfer electrodes 171-177. The visual pattern thus brought into view may then be held while another full visual pattern is fed into the serial shifting registers for subsequent transfer to the display cells, or the pattern in the display cells may be transferred back to the underlying serial shifting registers as may be desired.

A phosphor coating may be applied to the under side of the glass envelope at the display cells in both of the above described embodiments to intensify the luminosity and afford a more uniform appearance.

I claim:

l. A luminous display device comprising, an envelope, an ionizablegas therein, a plurality of elongated spaced metallic strips mounted in said envelope, a plurality of elongated spaced dielectric strips mounted across said metallic strips to form a grid of luminous display cells, certain of said metallic strips being formed with openings connecting adjacent cells, and electrodes mounted at said openings for shifting glow discharges from one to another of said cells.

2. A luminous display device comprising, an envelope,

an ionizable gas therein, a plurality of elongated spaced metallic strips mounted in said envelope, a plurality of elongated spaced dielectric strips mounted across said metallic strips to form a grid of luminous display cells, said metallic strips being formed with openings connecting said cells in rows of gaseous discharge channels between said dielectric strips, and electrodes mounted at said openings for shifting glow discharges along said channels from one to another of said cells.

3. A luminous display device as characterized in claim 2 and including a serial shifting register of the multiple position glow discharge type having a glow servicing gaseous discharge channel connected at longitudinally spaced positions to said first named discharge channels for introducing glow discharges therein.

4. A luminous display device comprising, an envelope having a light transmitting side, an ionizable gas therein, a grid mounted in said envelope at said side and composed of a plurality of elongated spaced metallic strips and a plurality of elongated spaced dielectric strips mounted across said metallic strips and cooperating with said side to form a grid of luminous display cells, electrodes mounted within said cells cooperating with said metallic strips when energized to sustain a glow discharge in said cells, said metallic strips being formed with openings connecting cells in rows of gaseous discharge channels between said dielectric strips, and electrodes mounted at said openings and cooperating with said metallic strips when energized for shifting glow discharges along said channels from one to another of said cells.

5. A luminous display device as characterized in claim 4, including a member mounted in spaced substantially parallel relation to one of said metallic strips to define a glow servicing channel, and electrodes arrayed along said servicing channels to sustain and shift discrete glow discharges at and between longitudinally spaced positions generally registering with the openings in said last mentioned metallic strip for introducing glow discharges into said first named channels.

6. In a device of the character described, a serial shifting register of the multiple position glow discharge type and including a gaseous discharge channel and electrodes arrayed therealong to sustain and shift discrete glow discharges at and between longitudinally spaced cells in said channel, means at said cells providing connecting and laterally extending gaseous discharge channels formed with luminous display cells, and electrodes associated with said laterally extending channels and display cells for optionally shifting glow discharges from said first named cells to said display cells.

7. A luminous display device comprising, an envelope, an ionizable gas therein, a dielectric partition in said envelope, a grid mounted in said envelope on one side of said partition and composed of a plurality of elongated spaced dielectric strips mounted across a plurality of elongated spaced metallic strips to form rows of luminous display cells arranged on excitation of said metallic strips to sustain glow discharges, means at the opposite side of said partition providing gaseous discharge channels parallel to said rows, said partition being formed with openings connecting said channels and cells, electrodes arraved along said channels to sustain and shift discrete glow discharges at and between longitudinally spaced positions at said openings, and electrodes at said openings for shifting glow discharges from said channels to cells.

References Cited in the tile of this patent UNITED STATES PATENTS 2.500.929 Chilowsky Mar. 21, 1950 2.558.019 Toulon June 26, 1951 2.749.480 Ruderfer June 5, 1956 2,760,119 Toulon Aug. 21, 1956