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Vacuum fluorescent display

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insulating layer in a VFD is normally black, however it can be removed or made transparent to allow the display to be transparent. AMVFD displays that incorporate a driver IC are available for applications that require high image brightness and an increased number of pixels. Phosphors of different colors can be stacked on top of each other for achieving gradations and various color combinations. Hybrid VFDs include both fixed display segments and a graphic VFD in the same unit. VFDs may have display segments, grids and related circuitry on their front and rear glass panels, using a central cathode for both panels, allowing for increased segment density. The segments can also be placed exclusively on the front instead of on the back, improving viewing angles and brightness.
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of display technology varied through commercial decisions by the manufacturer, with companies such as Casio, Canon & Sharp dropping LED displays in preference to VFDs and early LCDs, whereas Texas Instruments and Hewlett Packard, both manufacturers of LED displays, continued with LED technology for much longer. Later, once LCD technology was well established, it displaced LED displays and VFDs in handheld calculators, offering lower power requirements at lower cost. More recently, outside the education sector, calculator applications on mobile phones have for many replaced the pocket calculator, and there is progression from LED backlit LCDs back to full LED displays in the form of Organic Light Emitting Diode (OLED) displays.
269:, emitting light. Unlike the orange-glowing cathodes of traditional vacuum tubes, VFD cathodes are efficient emitters at much lower temperatures, and are therefore essentially invisible. The anode consists of a glass plate with electrically conductive traces (each trace is connected to a single indicator segment), which is coated with an insulator, which is then partially etched to create holes which are then filled with a conductor like 205: 466: 31: 20: 66: 362:). The brightness of VFDs makes them well suited for use in cars. The Renault Espace Mk4 and Scenic Mk2 used VFD panels to show all functions on the dashboard including the radio and multi message panel. They are bright enough to read in full sunlight as well as dimmable for use at night. This panel uses four colors; the usual blue/green as well as deep blue, red and yellow/orange. 339: 47: 374:. While later games had sophisticated multi-color displays, early games achieved color effects using transparent filters to change the color of the (usually light blue) light emitted by the phosphors. High power consumption and high manufacturing cost contributed to the demise of the VFD as a videogame display. 280:
The cathode wire to which the oxides are applied is made of tungsten or ruthenium-tungsten alloy. The oxides in the cathodes are not stable in air, so they are applied to the cathode as carbonates, the cathodes are assembled into the VFD, and the cathodes are heated by passing a current through them
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with high-brightness VFDs operating at 4,000 cd/m, and experimental units as high as 35,000 cd/m depending on the drive voltage and its timing. The choice of color (which determines the nature of the phosphor) and display brightness significantly affect the lifetime of the tubes, which can
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Of the three prevalent display technologies – VFD, LCD, and LED – the VFD was the first to be developed. VFD and LED displays were used in early handheld calculators. LED displays were an alternative to VFDs in this use as they had simpler power requirements, not requiring the high voltages. Choice
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Besides brightness, VFDs have the advantages of being rugged, inexpensive, and easily configured to display a wide variety of customized messages, and unlike LCDs, VFDs are not limited by the response time of rearranging liquid crystals and are thus able to function normally in cold, even sub-zero,
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driving the display enables a digit by placing a positive voltage on that digit's grid and then placing a positive voltage on the appropriate plates. Electrons flow through that digit's grid and strike those plates that are at a positive potential. The microprocessor cycles through illuminating the
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The first VFD was the single indication DM160 by Philips in 1959. The first multi-segment VFD was a 1967 Japanese single-digit, seven-segment device made by Ise Electronics Corporation. The displays became common on calculators and other consumer electronics devices. In the late 1980s hundreds of
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The first VFD was the single indication DM160 by Philips in 1959. It could easily be driven by transistors, so was aimed at computer applications as it was easier to drive than a neon and had longer life than a light bulb. The 1967 Japanese single digit seven segment display in terms of anode was
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providing a deep green or deep blue, depending on the whims of the product's designers. Phosphors used in VFDs are different from those in cathode-ray displays since they must emit acceptable brightness with only around 50 volts of electron energy, compared to several thousand volts in a CRT. The
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In addition to the widely used fixed character VFD, a graphic type made of an array of individually addressable pixels is also available. These more sophisticated displays offer the flexibility of displaying arbitrary images, and may still be a useful choice for some types of consumer equipment.
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could be manufactured for a fraction of the price, did not require frequent changes of batteries (or AC adapters) and were much more portable. Since the late 1990s, backlit color active-matrix LCD displays have been able to cheaply reproduce arbitrary images in any color, a marked advantage over
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Fading is sometimes a problem with VFDs. Light output drops over time due to falling emission and reduction of phosphor efficiency. How quickly and how far this falls depends on the construction and operation of the VFD. In some equipment, loss of VFD output can render the equipment inoperable.
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where the multiple grids and plates form a matrix, minimizing the number of signal pins required. In the example of the VCR display shown to the right, the grids are arranged so that only one digit is illuminated at a time. All of the similar plates in all of the digits (for example, all of the
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Emission may usually be restored by raising filament voltage. Thirty-three percent voltage boost can rectify moderate fade, and 66% boost severe fade. This can make the filaments visible in use, though the usual green-blue VFD filter helps reduce any such red or orange light from the filament.
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The extra indicators (in our example, "VCR", "Hi-Fi", "STEREO", "SAP", etc.) are arranged as if they were segments of an additional digit or two or extra segments of existing digits and are scanned using the same multiplexed strategy as the real digits. Some of these extra indicators may use a
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numerals, multi-segment alpha-numeric characters or can be made in a dot-matrix to display different alphanumeric characters and symbols. In practice, there is little limit to the shape of the image that can be displayed: it depends solely on the shape of phosphor on the anode(s).
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Fading can be slowed by using a display driver chip to lower the voltages necessary to drive a VFD. Fading can also occur due to evaporation and contamination of the cathode. Phosphors that contain sulfur are more susceptible to fading.
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During the 1980s, this display began to be used in automobiles, especially where car makers were experimenting with digital displays for vehicle instruments such as speedometers and odometers. A good example of these were the high-end
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more like the Philips DM70 / DM71 Magic Eye as the DM160 has a spiral wire anode. The Japanese seven segment VFD meant that no patent royalties needed to be paid on desk calculator displays as would have been the case using
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units. These games featured bright, clear displays but the size of the largest vacuum tubes that could be manufactured inexpensively kept the size of the displays quite small, often requiring the use of magnifying
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fixed-color, fixed-character VFDs. This is one of the main reasons for the decline in popularity of VFDs, although they continue to be made. Many low-cost DVD players still feature VFDs.
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or Panaplex neon digits or for LED displays on pocket calculators. In the UK the Philips designs were made and marketed by Mullard (almost wholly owned by Philips even before WWII).
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From the mid-1980s onwards, VFDs were used for applications requiring smaller displays with high brightness specifications, though now the adoption of high-brightness
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temperatures, making them ideal for outdoor devices in cold climates. Early on, the main disadvantage of such displays was their use of significantly more power (0.2
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Kiyozumi, K., & Nakamura, T. (1983). Vacuum fluorescent displays: from single digits to colour TV. Displays, 4(4), 213–220. doi:10.1016/0141-9382(83)90116-6
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Chen, J., Cranton, W., & Fihn, M. (Eds.). (2016). Handbook of Visual Display Technology. doi:10.1007/978-3-319-14346-0 page 1610 onwards
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The Russian IV-15 VFD tube is very similar to the DM160. The DM160, DM70/DM71 and Russian IV-15 can (like a VFD panel) be used as
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in North America (the former from the early 1980s to the late-2000s in the form of (usually two) green
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Multiplexing may be used in VFDs to reduce the number of connections necessary to drive the display.
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range from as low as 1,500 hours for a vivid red VFD to 30,000 hours for the more common green ones.
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digits in this way at a rate high enough to create the illusion of all digits glowing at once via
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and the Apex Sangaku headphone amplifier. The Nutube is sold by Korg but made by Noritake Itron.
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when heated to 650 °C by an electric current. These electrons are controlled and
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lower-left plates in all of the digits) are connected in parallel. One by one, the
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A PCB with VFD display from a Casio M-1 Calculator, produced between 1976 and 1986
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Vacuum fluorescent displays were once commonly used as floor indicators for
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while inside the vacuum of the VFD to convert the carbonates into oxides.
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Hi-Fi. All segments are visible due to external ultraviolet illumination.
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was commonly used in the phosphors of VFDs in the past, but the current
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The smallest Triode and earliest VFD, the DM160, with size comparisons
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This technology was also used from 1979 to the mid-1980s in portable
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cars made in the early 1980s (referred to by Subaru enthusiasts as a
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The light emitted by most VFDs contains many colors and can often be
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phosphor that emits a different color of light, for example, orange.
285: 236: 161: 489:. The DM160 is thus the smallest VFD and smallest triode valve. The 338: 1492: 1062:"Ultra-high luminance, full dot matrix display|Futaba Corporation" 610:"Fluorescent phosphorescent coating free from sulphur and cadmium" 464: 232: 224: 203: 153: 45: 29: 18: 284:
The principle of operation is identical to that of a vacuum tube
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of a VFD digit with 3 horizontal tungsten wires and control grid
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A full view of a typical vacuum fluorescent display used in a
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once commonly used on consumer electronics equipment such as
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William M. Yen, Shigeo Shionoya, Hajime Yamamoto (editors),
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Chapter 7 Vacuum Fluorescent Displays pp. 163 and following
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have experimented with the possibilities of using VFDs as
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Vacuum Fluorescent Display Amplifiers For Primitive Radio
1032:"Double Layer Phosphor Printing VFD|Futaba Corporation" 409:, one for the arrow and the other two for the digits). 164:
vacuum tube because it also has a mesh control grid.
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Thick-film dielectric electroluminescent technology
1577: 1472: 1419: 1410: 253:(barium, strontium and calcium oxides), which emit 1952:Comparison of CRT, LCD, plasma, and OLED displays 579: 577: 575: 808:Elektrotechnik Tabellen Kommunikationselektronik 156:that is bombarded by electrons emitted from the 34:A close-up of the VFD highlighting the multiple 1002:"Chip In Glass VFD(CIG VFD)|Futaba Corporation" 584:Janglin Chen; Wayne Cranton; Mark Fihn (2011). 565: 563: 561: 559: 557: 555: 553: 551: 1348:Photos and specs for antique Russian VFD tubes 386:(OLEDs) is pushing VFDs out of these markets. 50:Vacuum fluorescent display from a CD and dual 1388: 335:supply or heavy-duty rechargeable batteries. 8: 1339:Vacuum Fluorescent Display (VFD) (including 1606:Surface-conduction electron-emitter display 1151:: CS1 maint: numeric names: authors list ( 663:: CS1 maint: numeric names: authors list ( 239:condition. The cathode is made up of fine 1517:Active-Matrix Organic light-emitting diode 1416: 1395: 1381: 1373: 57: 1092:"Clear Background VFD|Futaba Corporation" 756: 754: 530:Shigeo Shionoya; William M. Yen (1998). 337: 853:"Front Luminous VFD|Futaba Corporation" 522: 1368:The Russian VFD indicator like a DM160 1144: 656: 588:. 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Castellano (ed), 707:Joseph A. Castellano (ed), 686:Joseph A. Castellano (ed), 399:Montgomery Elevator Company 1998: 1721:Vacuum fluorescent display 1445:Electroluminescent display 534:. CRC Press. p. 561. 115:vacuum fluorescent display 1960: 1568:Liquid crystal on silicon 1341:How to drive the filament 261:by the grids (made using 215:The device consists of a 42:at the right of the image 1759:Fourteen-segment display 1562:Digital Light Processing 1306:"Calculator.org website" 1127:Electronics Point forums 730:"VFD|Futaba Corporation" 495:photo of DM160 and IV-15 127:video cassette recorders 1765:Sixteen-segment display 1451:Rear-projection display 1353:Simple VFD Test Circuit 507:Sixteen-segment display 263:photochemical machining 169:liquid crystal displays 144:, roughly similar to a 1612:Field-emission display 1527:Liquid-crystal display 1121:N9WOS (29 July 2005). 470: 346: 235:envelope under a high 212: 55: 43: 27: 25:videocassette recorder 1749:Eight-segment display 1743:Seven-segment display 977:www.noritake-itron.jp 634:(HB9RXQ), Ernst Erb. 468: 395:Otis Elevator Company 344:Mercury Grand Marquis 341: 300:persistence of vision 207: 49: 33: 22: 1982:Vacuum tube displays 1871:Display capabilities 1754:Nine-segment display 1456:Plasma display panel 1098:. 27 February 2021. 1068:. 27 February 2021. 1038:. 27 February 2021. 1008:. 27 February 2021. 949:. 27 February 2021. 919:. 27 February 2021. 889:. 27 February 2021. 859:. 27 February 2021. 290:multiplexed displays 59:Different VFD tubes 1900:See-through display 1804:Holographic display 1482:Quantum dot display 1167:"H. P. Friedrichs, 640:www.radiomuseum.org 407:dot-matrix displays 403:16-segment displays 142:cathodoluminescence 60: 1942:Color Light Output 1936:High Dynamic Range 1738:Dot-matrix display 1733:Lightguide display 1404:Display technology 834:, CRC Press, 2007 471: 347: 213: 58: 56: 44: 28: 1969: 1968: 1895:Always-on display 1686:Electromechanical 1674: 1673: 832:Phosphor Handbook 595:978-3-540-79566-7 541:978-0-8493-7560-6 532:Phosphor Handbook 497:for comparison). 430:triode amplifiers 187:VFDs can display 111: 110: 1989: 1947:Flexible display 1909:Related articles 1789:Autostereoscopic 1488:Electronic paper 1434:Cathode-ray tube 1417: 1397: 1390: 1383: 1374: 1322: 1321: 1319: 1317: 1302: 1296: 1295: 1293: 1292: 1277: 1271: 1270: 1268: 1266: 1251: 1245: 1244: 1242: 1240: 1225: 1219: 1218: 1216: 1215: 1200:"Des. Kostryca, 1196: 1190: 1189: 1187: 1186: 1163: 1157: 1156: 1150: 1142: 1140: 1138: 1133:on 11 March 2018 1129:. 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In 2015, 217:hot cathode 209:Macro image 103:16 segments 1862:Laser beam 1816:Volumetric 1776:3D display 1716:Nixie tube 1696:Split-flap 1581:generation 1555:Blue Phase 1475:generation 1422:generation 1291:2020-10-29 1214:2012-12-11 1210:. Eham.net 1185:2012-12-11 987:2020-01-04 817:3142250379 772:2020-10-29 744:2019-12-15 650:2012-08-13 620:2020-10-03 518:References 275:Zinc oxide 131:car radios 98:Sharp EL-8 94:8 segments 87:7 segments 1916:Scan line 1890:DisplayID 1847:Neon sign 1837:Monoscope 1679:Non-video 1440:Jumbotron 1106:4 January 1076:4 January 1046:4 January 1016:4 January 957:4 January 927:4 January 897:4 January 867:4 January 842:Chapter 8 391:elevators 376:LCD games 360:dashboard 356:digi-dash 267:fluoresce 255:electrons 221:filaments 36:filaments 1976:Category 1799:Hologram 1706:Eggcrate 1691:Flip-dot 1637:display 1618:Laser TV 1589:microLED 1519:(AMOLED) 1473:Current 1429:Eidophor 1310:Archived 1285:Archived 1265:11 March 1259:Archived 1239:11 March 1233:Archived 1206:eHam.net 1179:Archived 1173:eHam.net 1147:cite web 1137:11 March 1100:Archived 1070:Archived 1040:Archived 1010:Archived 951:Archived 921:Archived 891:Archived 861:Archived 766:Archived 719:page 176 659:cite web 644:Archived 614:Archived 501:See also 424:Several 311:filtered 271:graphite 259:diffused 241:tungsten 229:phosphor 150:phosphor 52:cassette 1883:CEA-861 1513:(OLED) 1498:Gyricon 1316:23 July 487:triodes 461:History 178:Cadmium 167:Unlike 121:) is a 40:springs 1767:(SISD) 1661:(TDEL) 1655:(FLCD) 1602:(OLET) 1570:(LCoS) 1529:(LCD) 1507:(LED) 1484:(QLED) 1458:(PDP) 838:  814:  793:  715:  698:page 9 694:  592:  538:  438:Nutube 352:Subaru 286:triode 237:vacuum 225:anodes 200:Design 162:triode 133:, and 1938:(HDR) 1761:(FSD) 1745:(SSD) 1729:(LEC) 1723:(VFD) 1667:(LPD) 1614:(FED) 1608:(SED) 1579:Next 1564:(DLP) 1493:E Ink 1447:(ELD) 1436:(CRT) 491:IV-15 329:watts 244:wires 233:glass 154:anode 1878:EDID 1700:Vane 1646:TMOS 1641:IMoD 1635:MEMS 1462:ALiS 1420:Past 1318:2023 1267:2018 1241:2018 1153:link 1139:2018 1108:2020 1078:2020 1048:2020 1018:2020 959:2020 929:2020 899:2020 869:2020 836:ISBN 812:ISBN 791:ISBN 713:ISBN 692:ISBN 665:link 590:ISBN 536:ISBN 448:Fade 434:Korg 182:RoHS 173:cd/m 1550:LED 1543:IPS 1533:TFT 442:Vox 393:by 322:Use 119:VFD 1978:: 1538:TN 1308:. 1283:. 1257:. 1231:. 1204:, 1171:, 1149:}} 1145:{{ 1125:. 1094:. 1064:. 1034:. 1004:. 975:. 945:. 915:. 885:. 855:. 764:. 753:^ 732:. 661:}} 657:{{ 642:. 638:. 612:. 574:^ 550:^ 333:AC 302:. 137:. 129:, 113:A 1396:e 1389:t 1382:v 1343:) 1320:. 1294:. 1269:. 1243:. 1217:. 1188:. 1155:) 1141:. 1110:. 1080:. 1050:. 1020:. 990:. 961:. 931:. 901:. 871:. 820:. 775:. 747:. 667:) 653:. 623:. 598:. 544:. 227:( 219:( 117:( 106:0 100:) 96:( 90:0

Index


videocassette recorder

filaments
springs

cassette
7 segments
8 segments (Sharp EL-8)
16 segments
Sharp EL-8
display device
video cassette recorders
car radios
microwave ovens
cathodoluminescence
cathode ray tube
phosphor
anode
cathode filament
triode
liquid crystal displays
cd/m
Cadmium
RoHS
seven-segment

Macro image
hot cathode
filaments

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