Knowledge (XXG)

Unified Display Interface

Source πŸ“

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standard; anonymous sources stated the licensing fees associated with HDMI and incorporation of HDCP into DisplayPort swayed Intel's support. Other vendors started to use HDMI version 1.3, and both Intel and Samsung withdrew their support from UDI. There have been no announcements made about UDI since early 2007 and the UDI website became no longer operational after 2007, and it appears the UDI standard was abandoned before products were released.
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The external and embedded connector implementations were electrically compatible and physically similar, each with a single row of contacts, but they had different form factors and contact counts. The "embedded" implementation was only specified for the display panel interface and had a single row of
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The group changed its title in late 2006 from "special interest group" to "working group" and contemporary press coverage noted that "UDI is weak when it comes to industry support", accurately predicting the future DisplayPort/HDMI duopoly. In early 2007 Intel started supporting the rival DisplayPort
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Three of the contacts were reserved for future upgrade possibilities. Transmit and receive plugs and receptacles were different physically, similar to peripheral cables with USB-A and USB-B on each end, requiring the UDI cable to be plugged in one way only. Bidirectional communication worked at a
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Under the external profile, data was transmitted using three differential data pairs and one differential clock pair using the TMDS encoding scheme. The external profile is considered an extension of HDMI and is backwards-compatible with HDMI Rev. 1.2 displays; however, UDI does not carry audio
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What we have then is a re-run of the old USB vs Firewire debate: two standards that do, give or take a plus point or two, the same job largely as well as each other. In each case, sufficiently large industry camps have formed around each to ensure neither will vanish, and vested intellectual
568:. Fundamentally, DisplayPort transmits video in packets of data, while the preceding DVI and HDMI standards transmit raw video as a digital signal; UDI took an approach closer to DVI/HDMI. The UDI specification 1.0 was finalized and released in July 2006. The differences between UDI and 500:
consumer electronics devices such as television monitors and DVD players, UDI was specifically targeted towards computer monitor and video card manufacturers and did not support the transfer of audio data. A contemporary rival standard,
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On December 20, 2005, the UDI Special Interest Group (UDI SIG) was announced, along with a tentative specification called version 0.8. The group, which worked on refining the specification and promoting the interface, was led by
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were kept to a minimum since both specifications were designed for long-term compatibility. Again, UDI lagged DisplayPort by a few months, which had released its finalized version 1.0 specification in May 2006.
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information as it is targeted towards high-resolution computer monitors instead. As HDMI is itself an extension of DVI with HDCP, UDI external profile is compatible with these standards as well.
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The embedded profile was slightly different, using either one or three differential pairs, each of which carried both data and clock information. The embedded profile uses an ANSI
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26 contacts, while the "external" implementation had a single row of 22 contacts inside a metal shield with a physically keyed rectangular cross-section, resembling the
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UDI provided higher bandwidth than its predecessors (up to 16 Gbit/s in its first version, compared to 4.95 Gbit/s for HDMI 1.0) and incorporated a form of
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There were two UDI implementations: "external profile" (for desktop computers and displays) and "embedded profile" (for the internal display of a laptop computer).
1633:, Whitby-Strevens, Colin, "Methods and apparatus for harmonization of interface profiles", published November 8, 2007, assigned to Apple Inc. 1357: 505:, gained significant industry support starting in 2007 and the UDI specification was abandoned shortly thereafter without having released any products. 2054: 1673: 604: 2184: 2153: 2141: 549: 2163: 620:
Type A connectors. The contacts were spaced on a pitch of 0.6 mm (0.024 in) (external) and 1.0 mm (0.039 in) (embedded).
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property and licensing interests means there's little chance of the two coming together into a single standard.
486: 2016: 1969: 1912: 1821: 1719: 1630: 2341: 2316: 1442: 2306: 2225: 2080: 1974: 1917: 1358:"Connecting systems to displays with DVI, HDMI, DisplayPort: What we got here is failure to communicate" 494: 482: 2199: 1657: 1473: 1414: 617: 489:(DVI). It was intended to be a lower cost implementation while providing compatibility with existing 1328: 1245: 2356: 2235: 1831: 1712: 539: 1734: 1539: 2351: 1952: 1729: 1687: 1220:"Proposed New Interface to Bring Next-Generation Connectivity to PC Monitors and CE Devices" 553: 207: 2382: 1843: 1806: 1796: 1650: 593: 561: 1506: 2346: 2220: 2179: 2131: 1275: 519: 1305: 2433: 2402: 2276: 2215: 2126: 2121: 1922: 1889: 1874: 1826: 1791: 1775: 1755: 1739: 1724: 1707: 227: 1391: 624:
much lower data rate than that available for the single direction video datastream.
552:(VESA) in May 2005. DisplayPort was being developed by a rival consortium including 1692: 478: 100: 1223: 2387: 1947: 1932: 545: 502: 64: 1619: 1591: 1811: 497: 1642: 2336: 2301: 1867: 1702: 1963: 1894: 1855: 527: 1618:. Unified Display Interface Working Group. July 12, 2006. Archived from 1590:. Unified Display Interface Working Group. July 12, 2006. Archived from 2286: 2032: 1937: 1879: 1770: 535: 1222:(Press release). Silicon Image, Inc. December 20, 2005. Archived from 2331: 2321: 1838: 1816: 1765: 1302:"Industry group promotes UDI as successor of VGA graphical interface" 531: 1198:
Required for both source and sink, for active adapters or repeaters
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External UDI receptacles for the (R)eceiver and (T)ransmitter
2281: 2256: 2021: 1613:"Unified Display Interface Specification, Revision 1.0a Final" 1585:"Unified Display Interface Specification, Revision 1.0a Final" 1450: 548:
standard by a few months, which had been unveiled by the
493:(HDMI) and DVI displays. Unlike HDMI, which is aimed at 1329:"PC, CE firms to develop 'unified' display connector" 1269:"Unified Display Interface (UDI) Technical Overview" 2411: 2375: 2265: 2244: 2208: 2172: 2140: 2094: 2068: 2009: 1993: 1905: 1784: 1748: 1680: 1500: 1498: 457: 446: 435: 424: 413: 399: 388: 377: 366: 355: 344: 333: 322: 311: 300: 289: 278: 267: 256: 245: 234: 219: 200: 192: 184: 176: 171: 163: 155: 150: 133: 125: 117: 109: 99: 91: 83: 75: 70: 60: 50: 42: 34: 29: 21: 485:specification released in 2006 which was based on 180:R,G,B data + clock and display data channel (TMDS) 2419:List of digital television deployments by country 1246:"Next-gen display standard emerges for PC, HDTVs" 805:UDI differential reference clock: -; second mate 794:UDI differential reference clock: +; second mate 381:Negative side of UDI differential reference clock 370:Positive side of UDI differential reference clock 1027:UDI lane 1 data; used for Γ—1 and Γ—3 lane widths 1474:"Any port in a storm: the display tech battle" 962:Supply return for control and data link power 2048: 1658: 1057:UDI lane 2 data; only used for Γ—3 lane width 997:UDI lane 0 data; only used for Γ—3 lane width 772:UDI differential data pair 0: -; second mate 761:UDI differential data pair 0: +; second mate 739:UDI differential data pair 1: -; second mate 728:UDI differential data pair 1: +; second mate 706:UDI differential data pair 2: -; second mate 695:UDI differential data pair 2: +; second mate 8: 1579: 1577: 16: 1575: 1573: 1571: 1569: 1567: 1565: 1563: 1561: 1559: 1557: 1351: 1349: 249:Reserved connector pin. No cable connection 238:Reserved connector pin. No cable connection 223:Reserved connector pin. No cable connection 2055: 2041: 2033: 1665: 1651: 1643: 903: 627: 206: 15: 1529: 1527: 1384:"Unified Display Interface Nears Release" 1133:Supply voltage for control link signals 1211: 1185: 1183: 1179: 927:Supply voltage for data link circuitry 915: 639: 550:Video Electronics Standards Association 450:Supply voltage for control link signals 1443:"Unified Display Interface Work Group" 1437: 1435: 1300:Wolfgang Gruener (December 20, 2005). 7: 1505:O'Donnell, Bob (September 5, 2007). 491:High-Definition Multimedia Interface 816:Ground; discrete wire; second mate 544:The announcement of UDI lagged the 14: 1534:Tuan Nguyen (February 19, 2007). 1356:Dipert, Brian (January 4, 2007). 841:UDI auxiliary power; second mate 2086:Ultra-high-definition television 1507:"HDMI: The digital display link" 1327:Smith, Tony (21 December 2005). 885:UDI hot-plug detect; third mate 348:Negative side of UDI lane 0 data 337:Positive side of UDI lane 0 data 315:Negative side of UDI lane 1 data 304:Positive side of UDI lane 1 data 282:Negative side of UDI lane 2 data 271:Positive side of UDI lane 2 data 1189:Only applicable for UDI to HDMI 852:UDI control clock; second mate 1415:"VESA completes DVI successor" 905:UDI embedded connector pinout 863:UDI control data; second mate 750:UDI Data0 shield; second mate 717:UDI Data1 shield; second mate 684:UDI Data2 shield; second mate 629:UDI external connector pinout 1: 1631:US abandoned 2007257923A1 1382:Tuan Nguyen (July 3, 2006). 1248:. EETimes. December 20, 2005 828:Consumer Electronics Control 783:UDI Clk shield; second mate 404:Consumer Electronics Control 1538:. DailyTech. Archived from 1472:Smith, Tony (28 May 2007). 874:UDI power: +5V; third mate 87:17.3 mm (0.68 in) 79:10.7 mm (0.42 in) 2461: 2445:High-definition television 2440:Digital display connectors 2076:High-definition television 1674:Audio and video connectors 1413:Smith, Tony (4 May 2006). 1304:. TG Daily. Archived from 95:3.7 mm (0.15 in) 1166:UDI link hot-plug detect 1086: 1056: 1026: 996: 961: 926: 601:digital rights management 471:Unified Display Interface 214: 205: 195: 187: 179: 166: 158: 136: 128: 120: 112: 104: 94: 86: 78: 63: 53: 45: 37: 24: 17:Unified Display Interface 2001:List of video connectors 830:(optional); second mate 487:Digital Visual Interface 461:UDI link hot-plug detect 1730:Speaker spring terminal 1274:. Intel. Archived from 1144:UDI control link clock 25:Digital video connector 1625:on September 28, 2007. 1597:on September 28, 2007. 1155:UDI control link data 673:Reserved; second mate 662:Reserved; second mate 651:Reserved; second mate 71:General specifications 2081:High-definition video 1076:Shield for UDI Data2 1046:Shield for UDI Data1 1016:Shield for UDI Data0 38:2006 (Abandoned 2007) 2132:8640p (16K Ultra HD) 2063:High-definition (HD) 1536:"The Future of HDMI" 1453:on November 19, 2007 1308:on December 23, 2005 1226:on December 24, 2005 392:Discrete ground wire 326:Shield for UDI_Data0 293:Shield for UDI_Data1 260:Shield for UDI_Data2 2245:Filming and storage 2127:4320p (8K Ultra HD) 2122:2160p (4K Ultra HD) 906: 630: 556:, Samsung, NVIDIA, 417:UDI auxiliary power 18: 904: 628: 540:Silicon Image Inc. 359:Shield for UDI_Clk 61:Superseded by 30:Production history 2427: 2426: 2173:Digital broadcast 2030: 2029: 1447:Official web site 1170: 1169: 900: 899: 468: 467: 428:UDI control clock 2452: 2352:Ultra HD Blu-ray 2164:MUSE (Hi-Vision) 2147: 2142:Analog broadcast 2057: 2050: 2043: 2034: 1667: 1660: 1653: 1644: 1639: 1638: 1634: 1626: 1624: 1617: 1599: 1598: 1596: 1589: 1581: 1552: 1551: 1549: 1547: 1542:on June 10, 2007 1531: 1522: 1521: 1519: 1517: 1502: 1493: 1492: 1486: 1484: 1469: 1463: 1462: 1460: 1458: 1449:. Archived from 1439: 1430: 1429: 1427: 1425: 1410: 1404: 1403: 1401: 1399: 1394:on July 13, 2006 1390:. Archived from 1379: 1373: 1372: 1370: 1368: 1353: 1344: 1343: 1341: 1339: 1324: 1318: 1317: 1315: 1313: 1297: 1291: 1290: 1288: 1286: 1281:on April 9, 2006 1280: 1273: 1264: 1258: 1257: 1255: 1253: 1242: 1236: 1235: 1233: 1231: 1216: 1199: 1196: 1190: 1187: 907: 631: 596:scheme instead. 554:ATI Technologies 439:UDI control data 210: 188:36 bit (maximum) 19: 2460: 2459: 2455: 2454: 2453: 2451: 2450: 2449: 2430: 2429: 2428: 2423: 2407: 2371: 2268: 2261: 2240: 2204: 2168: 2154:819 line system 2145: 2144: 2136: 2117:1440p (Quad HD) 2112:1080p (Full HD) 2107:1080i (Full HD) 2090: 2064: 2061: 2031: 2026: 2010:General-purpose 2005: 1989: 1906:Audio and video 1901: 1807:Composite video 1802:Component YPbPr 1780: 1744: 1676: 1671: 1636: 1629: 1622: 1615: 1611: 1608: 1603: 1602: 1594: 1587: 1583: 1582: 1555: 1545: 1543: 1533: 1532: 1525: 1515: 1513: 1504: 1503: 1496: 1482: 1480: 1471: 1470: 1466: 1456: 1454: 1441: 1440: 1433: 1423: 1421: 1412: 1411: 1407: 1397: 1395: 1381: 1380: 1376: 1366: 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original 1546:September 7, 1544:. Retrieved 1540:the original 1514:. Retrieved 1510: 1488: 1481:. Retrieved 1478:The Register 1477: 1467: 1457:September 7, 1455:. Retrieved 1451:the original 1446: 1422:. Retrieved 1419:The Register 1418: 1408: 1398:September 7, 1396:. Retrieved 1392:the original 1387: 1377: 1365:. Retrieved 1361: 1336:. Retrieved 1333:The Register 1332: 1322: 1312:September 7, 1310:. Retrieved 1306:the original 1295: 1285:September 7, 1283:. Retrieved 1276:the original 1262: 1250:. Retrieved 1240: 1230:September 7, 1228:. Retrieved 1224:the original 1214: 1194: 1152:UDI CtrlData 916:Description 860:UDI CtrlData 640:Description 622: 614: 598: 591: 587: 584: 575: 543: 512: 474: 470: 469: 442:UDI_CtrlData 164:Max. current 156:Max. voltage 126:Video signal 118:Audio signal 2412:Deployments 2388:DisplayPort 2269:compression 2095:Resolutions 2017:Thunderbolt 1948:DisplayPort 1918:Belling-Lee 1688:Banana plug 1141:UDI CtrlClk 1111:(Test pin) 1065:UDI Data2- 1035:UDI Data1- 1005:UDI Data0+ 896:first mate 849:UDI CtrlClk 546:DisplayPort 509:Development 503:DisplayPort 431:UDI_CtrlClk 177:Data signal 65:DisplayPort 2434:Categories 2376:Connectors 1812:D-Terminal 1720:Audio jack 1516:3 February 1483:2 February 1424:2 February 1367:3 February 1338:2 February 1252:August 15, 1206:References 1054:UDI Data2+ 1024:UDI Data1+ 994:UDI Data0+ 769:UDI Data0- 758:UDI Data0+ 736:UDI Data1- 725:UDI Data1+ 703:UDI Data2- 692:UDI Data2+ 498:multimedia 406:(optional) 351:UDI_Data0- 340:UDI_Data0+ 318:UDI_Data1- 307:UDI_Data1+ 285:UDI_Data2- 274:UDI_Data2+ 151:Electrical 51:Superseded 2383:Component 2302:DVD-Audio 2102:720p (HD) 1868:Micro-DVI 1703:Euroblock 1388:DailyTech 1087:Reserved 611:Connector 603:known as 581:Technical 483:interface 2069:Concepts 1970:Minijack 1964:superMHL 1923:CCJ/EIAJ 1895:Mini-VGA 1856:Mini-DVI 1832:Mini-DIN 1713:Mini-DIN 1511:EE Times 1130:UDI EPwr 951:VDD UDL 943:VDD UDL 935:VDD UDL 871:UDI EPwr 838:UDI APwr 802:UDI Clk- 791:UDI Clk+ 477:) was a 453:UDI_EPwr 420:UDI_APwr 384:UDI_Clk- 373:UDI_Clk+ 110:External 43:Produced 35:Designed 2287:Blu-ray 2185:DMB-T/H 1975:P&D 1938:HDBaseT 1880:S-Video 1771:TOSLINK 1735:Speakon 1163:UDI HPD 924:VDD UDL 882:UDI HPD 536:Samsung 479:digital 464:UDI_HPD 193:Bitrate 2332:MPEG-2 2327:HD VMD 2322:HD DVD 2159:HD MAC 1933:Type F 1839:DMS-59 1817:DB13W3 1766:S/PDIF 1637:  913:Signal 637:Signal 564:, and 538:, and 532:NVIDIA 481:video 458:Pin 22 447:Pin 21 436:Pin 20 425:Pin 19 414:Pin 18 400:Pin 17 389:Pin 16 378:Pin 15 367:Pin 14 356:Pin 13 345:Pin 12 334:Pin 11 323:Pin 10 201:Pinout 92:Height 76:Length 2367:W-VHS 2317:H.266 2312:H.265 2307:H.264 2297:D-VHS 2209:Audio 2200:SBTVD 1985:SCART 1785:Video 1761:D-sub 1623:(PDF) 1616:(PDF) 1595:(PDF) 1588:(PDF) 1279:(PDF) 1272:(PDF) 1174:Notes 1103:RSVD 1095:RSVD 566:Molex 524:Intel 516:Intel 312:Pin 9 301:Pin 8 290:Pin 7 279:Pin 6 268:Pin 5 257:Pin 4 246:Pin 3 235:Pin 2 220:Pin 1 185:Width 167:0.5 A 84:Width 2398:HDMI 2362:VC-1 2292:CBHD 2195:ISDB 2180:ATSC 1980:PDMI 1943:HDMI 1858:Π±Π•Ρ…ΠΊ 1548:2021 1518:2023 1485:2023 1459:2021 1426:2023 1400:2021 1369:2023 1340:2023 1314:2021 1287:2021 1254:2006 1232:2021 1084:RSVD 986:VSS 978:VSS 970:VSS 670:RSVD 659:RSVD 648:RSVD 605:HDCP 570:HDMI 558:Dell 252:(NC) 241:(NC) 172:Data 134:Pins 55:HDMI 46:None 22:Type 2403:VGA 2393:DVI 2342:MVC 2282:AV1 2257:HDV 2252:DCI 2236:DTS 2231:DXD 2226:DSD 2190:DVB 2022:USB 1960:MHL 1953:mDP 1928:EVC 1913:ADC 1890:VGA 1885:UDI 1875:RCA 1851:DVI 1844:LFH 1827:DIN 1822:DFP 1792:BNC 1776:XLR 1756:BNC 1740:XLR 1725:RCA 1708:DIN 1362:EDN 1160:26 1149:25 1138:24 1127:23 1119:GND 1116:22 1108:21 1100:20 1092:19 1081:18 1073:GND 1070:17 1062:16 1051:15 1043:GND 1040:14 1032:13 1021:12 1013:GND 1010:11 1002:10 959:VSS 910:Pin 879:22 868:21 857:20 846:19 835:18 824:CEC 821:17 813:Gnd 810:16 799:15 788:14 780:Gnd 777:13 766:12 755:11 747:Gnd 744:10 714:Gnd 681:Gnd 634:Pin 618:USB 475:UDI 409:CEC 395:GND 362:GND 329:GND 296:GND 263:GND 159:+5V 129:Yes 113:Yes 105:Yes 2436:: 1556:^ 1526:^ 1509:. 1497:^ 1487:. 1476:. 1445:. 1434:^ 1417:. 1386:. 1360:. 1348:^ 1331:. 1182:^ 991:9 983:8 975:7 967:6 956:5 948:4 940:3 932:2 921:1 890:β€” 733:9 722:8 711:7 700:6 689:5 678:4 667:3 656:2 645:1 607:. 560:, 534:, 530:, 528:LG 526:, 522:, 228:NC 121:No 2056:e 2049:t 2042:v 1966:) 1962:( 1666:e 1659:t 1652:v 1550:. 1520:. 1461:. 1428:. 1402:. 1371:. 1342:. 1316:. 1289:. 1256:. 1234:. 473:( 230:) 226:(

Index

HDMI
DisplayPort
Hot pluggable

NC
Consumer Electronics Control
digital
interface
Digital Visual Interface
High-Definition Multimedia Interface
high-definition
multimedia
DisplayPort
Intel
Apple Computer
Intel
LG
NVIDIA
Samsung
Silicon Image Inc.
DisplayPort
Video Electronics Standards Association
ATI Technologies
Dell
Hewlett-Packard
Molex
HDMI
8b/10b encoding
digital rights management
HDCP

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