EP1845589B1 - Computer system having analog and digital video signal output functionality, and computer device and video signal transmitting device thereof - Google Patents

Computer system having analog and digital video signal output functionality, and computer device and video signal transmitting device thereof Download PDF

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Publication number
EP1845589B1
EP1845589B1 EP20060255991 EP06255991A EP1845589B1 EP 1845589 B1 EP1845589 B1 EP 1845589B1 EP 20060255991 EP20060255991 EP 20060255991 EP 06255991 A EP06255991 A EP 06255991A EP 1845589 B1 EP1845589 B1 EP 1845589B1
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EP
European Patent Office
Prior art keywords
video signal
visual interface
digital
digital visual
analog
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 - Fee Related
Application number
EP20060255991
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German (de)
English (en)
French (fr)
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EP1845589A1 (en
Inventor
Chen Yuang-Chih
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AOpen Inc
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AOpen Inc
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Publication date
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Publication of EP1845589A1 publication Critical patent/EP1845589A1/en
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Publication of EP1845589B1 publication Critical patent/EP1845589B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R31/00—Coupling parts supported only by co-operation with counterpart
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2201/00—Connectors or connections adapted for particular applications
    • H01R2201/06—Connectors or connections adapted for particular applications for computer periphery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R27/00—Coupling parts adapted for co-operation with two or more dissimilar counterparts

Definitions

  • the invention relates to a video signal transmitting device for transmitting video signals between a display and a computer device, more particularly to a computer system that has both analog and digital video signal output functionality to enable dual screen displaying on a digital display and an analog display, and to a computer device and a video signal transmitting device of the computer system.
  • a conventional analog video signal transmission port is D-Sub, which is used, e.g., in a conventional cathode ray tube (CRT) display.
  • a digital video signal transmission port is a digital visual interface (DVI) for use in, e.g., a liquid crystal display.
  • the computer device can now support dual screen output displaying via a one-to-two video signal transmission line or two video signal transmission ports provided at a rear part of the computer device.
  • dual screen output displaying which uses a one-to-two video signal transmission line requires the video signal transmission ports of two associated displays to have the same specification, i.e., both are for either analog video signals or digital video signals. Dual screen displaying is not possible with one display device supporting analog video signals and the other supporting digital video signals, which can be inconvenient to the user.
  • the object of the present invention is to provide a computer system having analog and digital video signal output functionality to enable dual screen displaying on different specifications of displays, and a computer device and a video signal transmitting device of the computer system.
  • the video signal transmitting device having analog and digital video signal output functionality of the present invention is adapted to transmit video signals, and includes a cable unit, a digital visual interface integrated input port, a digital visual interface output port, and an analog video signal output port.
  • the digital visual interface integrated input port is disposed at one end of the cable unit, and is adapted to receive the video signals.
  • the digital visual interface integrated input port has a first pin set for digital video signals, and a second pin set for analog video signals.
  • the digital visual interface output port is disposed at the other end of the cable unit, and is connected to the first pin set through the cable unit.
  • the analog video signal output port is disposed at the other end of the cable unit, and is connected to the second pin set through the cable unit.
  • the video signal transmitting device having analog and digital video signal output functionality of the present invention can output digital video signals and analog video signals simultaneously for respective use by a digital display and an analog display, so that displays of different specifications can be used at the same time to perform dual screen displaying.
  • a computer system having both analog and digital video signal output functionality is shown to include a computer device 30, a video signal transmitting device 40, and a digital display 50, such as a liquid crystal display (LCD), and an analog display 60, such as a cathode ray tube (CRT) display.
  • a digital display 50 such as a liquid crystal display (LCD)
  • an analog display 60 such as a cathode ray tube (CRT) display.
  • CTR cathode ray tube
  • the computer device 30 has a housing 31 and a motherboard 32 received in the housing 31. It is noted that the computer device 30 further has other basic computer components, such as a microprocessor (not shown), a power supply 33, a memory (not shown), etc., and should not be limited to the disclosure of the preferred embodiment herein.
  • a conventional digital visual interface is configured to transmit digital video signals, and is also configured to transmit analog video signals.
  • a DVI-Integrated (DVI-I) transmission port can transmit both digital and analog video signals. Therefore, the computer device 30 of this preferred embodiment employs a DVI.
  • the motherboard 32 has a North Bridge 321 responsible for video, a digital visual interface (DVI) transmitter 322, and a DVI-I transmission port 323 for connecting with the video signal transmitting device 40.
  • the DVI-I transmission port 323 has a first pin set for digital video signals, and a second pin set for analog video signals.
  • the North Bridge 321 sends the digital video signals to the DVI transmitter 322 for format conversion, and the converted digital video signals are sent to the first pin set.
  • the North Bridge 321 sends the analog video signals to the second pin set.
  • the DVI-I transmission port 323 can output both digital and analog video signals.
  • a main communications interface between the displays 50, 60 and the computer device 30 is a display data channel (DDC) .
  • the DDC is set by the Video Electronic Standards Association (VESA) responsible for establishing video signal standards in the industry, and permits transmission of a series of numerical signals from the display 50 or 60 to the computer device 30. These numerical signals include basic product identification, basic parameters, and display specification.
  • VESA Video Electronic Standards Association
  • the computer device 30 detects such information, it will perform automatic configuration to display an optimum resolution so as to transmit the most suitable video signals to the display 50 or 60. Therefore, the first pin set of the conventional DVI-I transmission port is configured to have pins for transmitting DDC signals so that the computer device 30 can enable the digital display 50 to correctly display digital video signals.
  • the second pin set for analog video signals of the conventional DVI-I transmission port is not configured to transmit DDC signals so that the computer device 30 may not be able to allow the analog display 60 to properly display analog video signals.
  • the first pin set of the conventional DVI-I transmission port is generally configured with two TDMS channels
  • the design is comparatively complicated.
  • the image resolution when one TDMS channel is used is already sufficient.
  • the resolution may reach 1280*1024 (SXGA).
  • the screen updating speed is reduced to 60-Hz, the resolution can even reach 1600*1200 (UXGA). Therefore, generally, only one TDMS channel is actually used in practice. The other TDMS channel is allowed to lie idle.
  • the preferred embodiment configures two pins of the idle TDMS channel for transmitting DDC signals for analog video signals to the North Bridge 321.
  • the second pin set of the DVI-I transmission port 323 of the preferred embodiment is configured to include pins 20, 21 for transmitting DDC signals, i.e., the pins 20, 21 are used as pins for a display data channel, in which the pin 20 is a clock pin and the pin 21 is a data pin. It is noted that some grounding pins, such as pins 5, C5, etc., are shared by the first pin set and the second pin set.
  • pins 20, 21 of the second pin set can be used to acquire the DDC of the analog display 60 so as to ensure that the analog display 60 can display normally.
  • the video signal transmitting device 40 of the preferred embodiment is a one-to-two video signal transmission line, and has a cable unit 41, a digital visual interface integrated input port 42, a digital visual interface output port 43, and an analog video signal output port 44.
  • the digital visual interface integrated input port 42 cooperates with and has the same specification as the DVI-I transmission port 323 of the computer device 30, and has a first pin set and a second pin set that have the same definitions as those set forth in the above table, and that are used for connection with the DVI-I transmission port 323 to receive video signals from the computer device 30, i.e., the pin layout of the digital visual interface integrated input port 42 is the same as the pin layout of the DVI-I transmission port 323 shown in Figure 4 .
  • the cable unit 41 has two transmission lines 411, 412.
  • the transmission line 411 enables the pins of the digital visual interface output port 43 to be electrically connected to the first pin set, whereas the transmission line 412 enables the pins of the analog video signal output port 44 to be electrically connected to the second pin set.
  • the specification of a transmission port 501 of the digital display 50 is digital visual interface digital (DVI-Digital, hereinafter referred to as DVI-D) .
  • the specification of the digital visual interface output port 43 may be DVI-I or DVI-D.
  • the digital visual interface output port 43 is DVI-I
  • the specification of a transmission port 601 of the analog display 60 is D-Sub. Therefore, as shown in Figure 5 , the specification of the analog video signal output port 44 is also D-Sub.
  • the transmission line 411 connects the first pin set of the digital visual interface integrated input port 42 to the digital visual interface output port 43, and the idle pins 4, 5, 12, and 13 of the first pin set are not connected to the digital visual interface output port 43.
  • the transmission line 412 connects the second pin set of the digital visual interface integrated input port 42 to the pins of the analog video signal output port 44.
  • pairs of adjacent lead wires in the transmission line 411 for connecting pairs of pins 1 and 2, 6 and 7, 9 and 10, 17 and 18, and 23 and 24 in the digital visual interface integrated input port 42 which are provided for transmitting digital video signals, DDC and clock signals, respectively are intertwined
  • pairs of adjacent lead wires in the transmission line 412 for connecting pairs of pins 15 and 12, and 5 and 10 in the analog video signal output port 44 which are provided for transmitting DDC and grounding signals, respectively are intertwined.
  • the computer device 30 only needs to be provided with a single DVI-I transmission port 323 in combination with a video signal transmitting device 40 to permit displaying through one or both of the digital display 50 and the analog display 60.
  • the preferred embodiment is employed in conjunction with the digital display 50, it is only necessary to connect the digital visual interface integrated input port 42 of the video signal transmitting device 40 to the DVI-I transmission port 323 of the computer device 30, and to connect the digital visual interface output port 43 to the transmission port 501 of the digital display 50.
  • the North Bridge 321 of the computer device 30 After reading the DDC of the digital display 50, the North Bridge 321 of the computer device 30 sends the digital video signals to the DVI transmitter 322 for format conversion, and the converted digital video signals are sent to the digital display 50 via the video signal transmitting device 40 for display.
  • the digital visual interface integrated input port 42 of the video signal transmitting device 40 has to be connected to the DVI-I transmission port 323 of the computer device 30, and the analog video signal output port 44 is connected to the transmission port 601 of the analog display 60.
  • the computer device 30 reads the DDC of the analog display 60, and correct analog video signals are sent to the analog display 60 for display.
  • the digital visual interface integrated input port 42 of the video signal transmitting device 40 is connected to the DVI-I transmission port 323 of the computer device 30; the digital visual interface output port 43 is connected to the transmission port 501 of the digital display 50; and the analog video signal output port 44 is connected to the transmission port 601 of the analog display 60.
  • the computer device 30 will first read the DDC of the digital display 50 and the analog display 60, and send the correct digital video signals and analog video signals through the video signal transmitting device 40 to the digital display 50 and the analog display 60, respectively, for displaying, thereby achieving the purpose of displaying on the screens of two displays 50, 60 that have different specifications.
  • the computer system having dual outputs of analog and digital video signals configures the second pin set of the DVI-I transmission port 323 for analog video signals to have the pins 20, 21 for transmitting DDC signals so that the computer device 30 can be used to read DDC of the analog display 60 so as to correctly drive the analog display 60 for displaying.
  • the computer device 30 used in combination with the video signal transmitting device 40 can cooperate with either the digital display 50 or the analog display 60, or both of the digital display 50 and the analog display 60 to allow dual screen displaying so as to achieve the object of the present invention to permit dual screen displaying on different specifications of displays.

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EP20060255991 2006-04-13 2006-11-23 Computer system having analog and digital video signal output functionality, and computer device and video signal transmitting device thereof Expired - Fee Related EP1845589B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2006100736415A CN100461087C (zh) 2006-04-13 2006-04-13 具模拟数字视频输出的计算机系统、主机与视频传输装置

Publications (2)

Publication Number Publication Date
EP1845589A1 EP1845589A1 (en) 2007-10-17
EP1845589B1 true EP1845589B1 (en) 2009-01-07

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EP20060255991 Expired - Fee Related EP1845589B1 (en) 2006-04-13 2006-11-23 Computer system having analog and digital video signal output functionality, and computer device and video signal transmitting device thereof

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EP (1) EP1845589B1 (zh)
CN (1) CN100461087C (zh)
DE (1) DE602006004701D1 (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200739408A (en) 2006-04-03 2007-10-16 Aopen Inc Computer system having analog and digital video output functions, computer mainframe, and video signal transmission device
TWI456401B (zh) * 2012-02-09 2014-10-11 Quanta Comp Inc 電腦系統
CN104426025B (zh) * 2013-09-03 2018-04-17 鸿富锦精密工业（深圳）有限公司 电子装置连接系统
CN105141905B (zh) * 2015-08-14 2019-09-10 Tcl新技术（惠州）有限公司 一种拼接墙系统及其实现方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW461634U (en) * 2000-09-29 2001-10-21 Hon Hai Prec Ind Co Ltd Adapting connector
US6790094B1 (en) * 2002-09-12 2004-09-14 Formac Elektronik Gmbh Connector to couple a monitor to a computer
GB2394124B (en) * 2002-09-12 2006-11-22 Adder Tech Ltd Computer connection apparatus
CN2691170Y (zh) * 2004-01-09 2005-04-06 朱路 双路多媒体信号传输装置

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Publication number Publication date
EP1845589A1 (en) 2007-10-17
CN101055514A (zh) 2007-10-17
CN100461087C (zh) 2009-02-11
DE602006004701D1 (de) 2009-02-26

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