Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 1 of 29 PageID# 167
`Case 3:14-cv-OO757-REP-DJN Document 1-8 Filed 11/04/14 Page 1 of 29 Page|D# 167
`
`EXHIBIT F
`EXHIBIT F
`
`

`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 2 of 29 PageID# 168
`I llll
`II
`
`US006804724B2
`
`(12) United States Patent
`Shin
`
`(io) Patent No.:
`(45) Date of Patent:
`
`US 6,804,724 B2
`*Oct. 12,2004
`
`(54) ANALOG/DIGITAL DISPLAY ADAPTER AND
`A COMPUTER SYSTEM HAVING THE SAME
`
`6,028,585 A
`6,262,695 Bl
`
`2/2000
`7/2001
`
`Ishii et al
`McGowan
`
`345/132
`345/1
`
`(75)
`
`Inventor: Seung-Gi Shin, Suwon (KR)
`
`(73) Assignee: Samsung Electronics Co., Ltd.,
`Suwon-si (KR)
`
`( *) Notice:
`
`This patent issued on a continued pros
`ecution application filed under 37 CFR
`1.53(d), and is subject to the twenty year
`patent
`term provisions of 35 U.S.C.
`154(a)(2).
`
`Subject to any disclaimer, the terra of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`
`(21) Appl. No.: 09/301,609
`
`(22) Filed:
`
`Apr. 29,1999
`
`(65)
`
`Prior Publication Data
`
`US 2002/0149541 Al Oct. 17, 2002
`
`(30)
`
`Foreign Application Priority Data
`
`(KR)
`(KR)
`
`98-15395
`Apr. 29, 1998
`98-43766
`Oct. 16, 1998
`(51)
`G06F 13/00
`Int. CI.7
`710/2; 345/3; 345/147
`(52) U.S. CI
`345/147,3,22,
`(58) Field of Search
`345/186, 89, 1, 553,132, 127, 30, 211-213;
`710/2
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`9/1992 Berry
`5,150,109 A
`5,491,496 A * 2/1996 Tomiyasu
`5,559,525 A * 9/1996 Zenda
`5,608,418 A
`3/1997 McNally
`5,710,570 A *
`1/1998 Wada et al
`5,757,338 A
`5/1998 Bassetti et al
`
`345/600
`345/147
`345/1
`568/853
`345/3
`345/3.2
`
`FOREIGN PATENT DOCUMENTS
`
`EP
`EP
`
`0 419 910 A2
`0 802 519 Al
`
`4/1991
`10/1997
`
`OTHER PUBLICATIONS
`
`The User Manual for the Gateway Solo 5300 notebook
`computer, pp. 5 and 20.
`Printout
`of www.ati.com/products/mobilityradeon/dis-
`play.html from ATI technologoes, Inc.
`
`(List continued on next page.)
`
`Primary Examiner—Jeffrey Gaffin
`Assistant Examiner—Harold Kim
`(74) Attorney, Agent, or Firm—Robert E. Bushnell, Esq.
`(57)
`ABSTRACT
`
`A desktop computer system has a display adapter capable of
`supporting a digital display such as LCD panels as well as
`an analog display. The computer system provides analog/
`digital video signals outputted from the display adapter with
`a CRT monitor or a LCD monitor depending upon the
`monitorcable connection slate. The computer system further
`has a power saving function to be performed in the display
`adapter also depending upon the monitor cable connection
`state. The display adapter includes two video ports, that is,
`a first video port being coupled with the CRT monitor cable,
`and a second video port being coupled with the digital
`monitor cable. Further included is a digital transmitter for
`sending parallel digital video signals to the LCD monitor
`through the second video port. A monitor cable sensing
`circuit is provided to detect connection state of the digital
`monitor cable. To this end, the digital monitor generates a
`signal being sent to the second video port over the monitor
`cable, thereby informing the video controller of the monitor
`cable connection stale. If the LCD monitor cable is not
`connected with the video port, the sensing circuit prevents
`the display enable (DE) signal supplied by the video con
`troller from being inputted to the transmitter.
`
`14 Claims, 19 Drawing Sheets
`
`700
`
`724
`
`1st
`Transnltter
`
`LCD
`Panel
`
`.710
`
`725
`
`CRT
`Monitor
`
`•100
`
`=3
`
`LCD
`Monitor
`
`-600
`
`3 S
`
`727!
`
`726
`
`* Transal tter
`
`CPU
`
`BIOS
`
`m
`
`740
`
`750
`
`Main
`IfetDory
`
`TOO
`
`1/0
`Control lei **•
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`-721
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`Video
`BIOS
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`722
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`Controller
`
`H
`
`Video
`itenory
`
`723
`
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`
`\7
`
`Keyboard
`
`

`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 3 of 29 PageID# 169
`
`US 6,804,724 B2
`Page 2
`
`OTHER PUBLICATIONS
`
`Printout of www.ati.com/support/infobase/3588.html from
`ATI Technologies, Inc.
`Printout
`of
`ll-5053877.html.
`Printout of www.realtimesoft.com/multimon/guide/laptop-
`s.asp.
`Printout of www.rdpslides.com/pptfaq/FAQ00476.htm.
`
`techrepublic.com.com/5100-6270_
`
`Developer's note to the Power Macintosh G3 All-in-one
`computer, pp. 18 and 26.
`www.whatis.com or www.whatis.techtarget.com definition
`for "monitor" and "display".
`XP-002123075, VESA (Video Electronics Standards Asso
`ciation), Plug and Display (P & Z>™) Standard, Version 1,
`dated Jun. 11, 1997.
`
`* cited by examiner
`
`

`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 4 of 29 PageID# 170
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 1of 19
`
`US 6,804,724 B2
`
`•^4
`
`_.
`
`

`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 5 of 29 PageID# 171
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 2of 19
`
`US 6,804,724 B2
`
`Fig. 2
`
`(Prior art)
`
`Fig. 3
`
`(Prior art)
`
`110\
`
`'""
`
`321
`
`111
`
`

`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 6 of 29 PageID# 172
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 3 of19
`
`US 6,804,724 B2
`
`100
`A
`
`CRT
`Monitor
`
`Fig. 4
`
`(Prior art)
`
`300
`
`330
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`
`

`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 7 of 29 PageID# 173
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 4 of 19
`
`US 6,804,724 B2
`
`lO ~
`CO
`
`fefl
`
`o
`
`

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`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 8 of 29 PageID# 174
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 5 of19
`
`US 6,804,724 B2
`
`Fig. 6
`(Prior art)
`
`

`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 9 of 29 PageID# 175
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 6 of19
`
`US 6,804,724 B2
`
`CD
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`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 10 of 29 PageID# 176
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 7of 19
`
`US 6,804,724 B2
`
`♦i-»
`
`

`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 11 of 29 PageID# 177
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 8 of19
`
`US 6,804,724 B2
`
`Fig- 9
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`Fig- 10
`
`512-
`
`

`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 12 of 29 PageID# 178
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 9 of 19
`
`US 6,804,724 B2
`
`61)
`
`

`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 13 of 29 PageID# 179
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 10 of 19
`
`US 6,804,724 B2
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`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 14 of 29 PageID# 180
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet ll of19
`
`US 6,804,724 B2
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`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 15 of 29 PageID# 181
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`

`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 16 of 29 PageID# 182
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 13 of19
`
`US 6,804,724 B2
`
`CO
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`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 17 of 29 PageID# 183
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`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 18 of 29 PageID# 184
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 15 of 19
`
`US 6,804,724 B2
`
`Fig. 17A
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`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 19 of 29 PageID# 185
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 16 of 19
`
`US 6,804,724 B2
`
`Fig. 17C
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`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 20 of 29 PageID# 186
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 17 of19
`
`US 6,804,724 B2
`
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`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 21 of 29 PageID# 187
`
`U.S. Patent
`
`Oct. 12,2004
`
`Sheet 18 of 19
`
`US 6,804,724 B2
`
`Fig. 19
`
`

`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 22 of 29 PageID# 188
`
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`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 23 of 29 PageID# 189
`
`US 6,804,724 B2
`
`1
`ANALOG/DIGITAL DISPLAY ADAPTER AND
`A COMPUTER SYSTEM HAVING THE SAME
`
`2
`What is needed is a portable, notebook computer having
`an LCD display panel, that can accommodate hookups to
`another LCD digital flat panel display and a hookup to a
`CRT monitor. In this arrangement, the extra LCD display
`5 will contain circuitry that will let the notebook computer
`CLAIM OF PRIORITY
`know whether the extra LCD display monitor is hooked up
`,
`r
`„_.
`,.
`.
`u
`This application makes reference to, incorporates the w ^
`^ ^ delivered to the LCD hookup only
`r a ?°T\ ?£T ,
`S?% kT^
`?• "?•
`when an LCD monitor is plugged into the LCD hookup.
`U.S.C.§ 119from an applicationfor Analog/DigitalDisplay
`r
`e&
`r
`Adapter and a Computer System Having the Same earlier J0
`SUMMARY OF THE INVENTION
`filed in the Korean Industrial Property Office on Apr. 29
`1998 and there duly assigned Serial No. 15395/1998 and on
`The present invention is intended to solve the prior art
`Oct. 161998 andthere dulyassigned Serial No. 43766/1998.
`problems, and it is therefore an object of the invention to
`1. Field of the Invention
`provide a display adapter capable of supporting digital
`,
`m
`displays as well as analog displays.
`The present invention relates to computer systems, and 15
`,
`.
`,
`, . . . . .
`more particularly to a computer system having dual and
`^ Il,ls another obJec!of *einvention to provide acomputer
`triple display function that supports analog displays and
`display system having dual display adapters capable of
`dioital disolavs
`connecting one of the displays depending upon the monitor
`Z, n.
`.
`' c..
`, A .
`„ , .
`cable connection state.
`2. Discussion of the Related Art
`.
`.
`. . .
`.
`. . . . ™ »is further object of the invention to provide a computer
`„
`Conventionally personal computers are equipped with
`dis ,
`havi
`dual dis j
`^
`c We of
`cathode ray tube (CRT) monitors. Also, portable computers ^^
`consumed mone display adapter depending
`^ ^^ cable ^^^ state<
`such as laptop and notebook computers chiefly use flat panel
`liquid crystal displays. Occasionally, a desktop computer is
`,
`.
`,
`. .
`.,
`.
`.
`.
`,
`,.
`,
`l! » ^
`equipped with the liquid crystal display (LCD) monitor,
`vel ano'her °bJect to Pr°vide alnPle dfPlaY
`although it is costly. Today,
`liquid crystal displays are 25 noteb_°<* computer where the notebook computer-wall sup-
`Port ****** Wlth anolher LCD {USPlav and aCRT dlsPlav-
`considered as a substitute for the CRT display for their
`compactness and low power consumption.
`Itisstill another object toprovide a monitor for the LCD
`In the meantime, display monitors adopting the LCD
`hookup fines so that power wM only tedeUvered to the LCD
`°^f ,f the extra LCD mom,or " PluSSed into the
`panel have been developed to be used with the desktop 3Q *"*(cid:127)*
`personal computer. The LCD monitor has advantages oflow
`LCD hookup.
`power consumption and low electromagnetic wave radia-
`In accordance with one aspect ofthe present invention, a
`tion. LCD monitors commonly include aninterface circuitry
`desktop computer system is provided, which comprises: a
`that converts analog video signals inputted from the system
`main board having atleast one expansion slot; and adisplay
`host into digital video signals in order to drive every pixel
`adapter installed in one of the expansion slot of the main
`of the LCD panel. In particular, advanced digital display
`board, in which the display adapter including: a video
`systems use all-digital flat panel display interface that elimi-
`controller for providing analog video signals and digital
`nates the analog-to-digital conversion of the video signals
`video data with the CRT display and digital displays, respec-
`and transmits digital video data from ahost video controller
`lively; afirst video port for connecting with the CRT monitor
`to the LCD monitor through high speed data channel. This 4Q cable; and asecond video port for connecting with the digital
`solves the digital interface design problems such asincreas-
`display monitor.
`ingclockrates, data lines, and cable length. In thissystem,
`In accordance with another aspect of the present
`the video controller circuitry converts the video memory
`invention, a display adapter for use in a computer system is
`data into transferable form and reconstructs it once it gets to
`provided, which comprises: a video controller for outputting
`the display panel.
`serial analogvideosignals and paralleldigital videosignals;
`Yet there has not been provided in the desktop computer
`a first connector being coupled with the CRT monitor cable
`a display adapter orvideo card that supports that all-digital
`connector; asecond connector being coupled with the digital
`interface LCD monitor. Further, in the notebook computer,
`monitor cable connector; anda digital transmitter forsend-
`there has not been provided anexternal digital video output
`ing parallel digital video signals to a digital display through
`function that allows use of the all-digital interface LCD 50 the second connector,
`monitor.
`The display adapter further comprises a monitor cable
`Furthermore, there are cases where either the external
`sensing means fordetecting connection of thedigital moni-
`monitor cable fails toconnect withtheexternal video portof
`tor cable connector with the second connector, whereby a
`the notebook computer or the external monitor is not sup-
`display enable signal isgenerated inthe video controller and
`plied with the power. In either case, when the notebook 55 being sent to the digital transmitter when the connection
`computer system is set to output video signals through the
`between the digital monitor cable and the second connector
`external video port, theexternal monitor willnotoperate and
`hasbeen completed,
`thus nothing appeared on the monitor screen.
`Preferably, the digital monitor includes means for gener-
`Japanese Patent 2-64693 discloses a computer inwhich a
`ating a signal to be sent to the second connector of the
`CRT and an LCD are both available from separate output 60 display adapter over the monitor cable, thereby informing
`ports onacomputer. U.S. Pat. No. 5,608,418 fora Flat Panel
`the monitor cable connection with the second connector to
`Display Interface ForaHigh Resolution Computer Graphics
`thevideo controller.
`System to McNally discloses a graphics subsystem that
`Further, the display adapter further comprises a power
`contains a flat panel connector and a CRT connector. In
`supply control circuit for switching on/off of the supply
`addition, McNally shows that a color buffer circuit receives 65 voltages directed to the digital
`transmitter,
`in which the
`a flat panel sense data which indicates whether the flat panel
`power supply control circuit responds to the signal fed from
`display is coupled to the flat panel interface lines.
`the digital monitor such that the supply voltages are supplied
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`US 6,804,724 B2
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`with the transmitter when the connection between the digital
`monitor cable and the second connector has been completed.
`In accordance with the other aspect of the present
`invention, a portable computer system is provided, which
`comprises: a LCD panel hingedly attached to the main body
`of the portable computer; a main board having a display
`adapter; a video controller capable of providing digital video
`data with the LCD panel; a transmitter for sending parallel
`digital video data to an extra digital monitor; and an external
`video port for connecting a cable of the external digital
`monitor.
`The display adapter according to this invention allows the
`video signal to be sent to one of the LCD monitor and CRT
`monitor, any one that is connected with the video card,
`regardless of the video start-up direction or video output
`path set in the computersystem. Further,the display adapter
`of the invention is capable of reducing power consumed in
`the digital transmitter when the monitor cable is discon
`nected from the computer system.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
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`FIG. 14 is a detailed diagram for showing the LCD
`monitor cable sensing circuit;
`FIG. 15 is a block diagram of the VGA card having a
`power supply control circuit for the transmitter in accor
`dance with the invention;
`FIG. 16 is a schematic diagram of the power supply
`control circuit shown in FIG. 15;
`FIGS. 17A-17D are schematic circuit diagrams for show
`ing examples of the power supply control circuit;
`FIG. 18 is an exterior view of a notebook computer
`having analog/digital video adapter, showing connection of
`external CRT monitor and LCD monitor therewith;
`FIG. 19 is a rear view of the notebook computer of FIG.
`18, for showing connection of the CRT monitor cable and
`LCD monitor cable with two video ports thereof; and
`FIG. 20 is a block diagram of the notebook computer
`system having a VGA card with an external CRT port and
`LCD port in accordance with another embodiment of the
`invention.
`
`DETAILED DESCRIPTION OF THE
`INVENTION
`An earlier desk top personal computer is shown in FIG. 1,
`in which a CRT monitor 100 and keyboard 200 are coupled
`to a tower type personal computer 300 as indispensable
`input/output devices. The CRT monitor 100 and keyboard
`200 are connected to the computer 300 via signal cables 110
`and 210 as shown in FIG. 2. These signal cables 110 and 210
`are providedwith at one end connectors 111and 211 so they
`can be coupled with the counterpart connectors or ports 321
`and 312 provided in the computer. As shown in FIG. 3, the
`video port 321 is mounted in a video adapter card 320
`installed in one of expansion slots 311 of the system mother
`board 310. The keyboard port 312 is also mounted in the
`mother board 310.
`A configuration of the earlier computer system having
`such a connection can be seen in FIG. 4. The computer
`system comprises a central processing unit (CPU) 330, a
`BIOS 340, a main memory 350, an I/O controller 360, and
`a video card 320. The video card 320 includes a video BIOS
`322, a video controller 323, a video memory 324, and a
`connector 321. The video controller 323 generates analog R,
`G, B video signals corresponding to the stored image in the
`video memory 324 and transmits the serialized video signals
`along with horizontal and vertical synchronizing signals to
`the CRT monitor 100 through the connector 321. The
`connector 321 commonly uses 15-pin D-Sub female VGA
`connectors. Thus, most desktop computers have been
`designed to use with the CRT monitor.
`In the case of a portable computer, usually a LCD panel
`is used as a main display and selectively an extra CRT
`monitor can be used therewith as shown in FIG. 5. The LCD
`panel 410 is hingedly attached to the main body 405 of
`notebook computer 400, facing a computer user in the open
`position and forming a lid covering the top portion of the
`main body 405 in the close position. The CRT monitor 100
`can be selectively connected with the notebook computer, if
`an external video port is provided in the notebook computer.
`FIG. 6 shows the rear side of the notebook computer 400,
`where an external video port 425, preferably 15-pin D-Sub
`female connector is provided in line with serial/parallel
`ports. The CRT monitor cable 110 has analog 15-pin D-Sub
`male connector 111 to be coupled with the external video
`port 425 when required.
`FIG. 7 shows a configuration of an earlier notebook
`computer system as described above. The notebook com-
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`A more complete appreciation of the invention, and many
`of the attendant advantages thereof, will be readily apparent
`as the same becomes better understood by reference to the 25
`following detailed description when considered in conjunc
`tion with the accompanying drawings in which like refer
`ence symbols indicate the same or similar components,
`wherein:
`FIG. 1 is an exterior view of an earlier desk top personal 30
`computer with a CRT monitor;
`FIG. 2 is a rear view of the desk top computer of FIG. 1,
`for showing connection of the CRT monitor cable with a
`video port thereof;
`FIG. 3 is a view similar to FIG. 2, showing a video card
`installed in an expansion slot of the computer;
`FIG. 4 is a block diagram of an earlier computer system
`having a VGA card;
`FIG. 5 is an exterior view of an earlier notebook
`computer,for showing connection of an extra CRT monitor
`therewith;
`FIG. 6 is a rear view of the notebook computer of FIG. 5,
`for showing connection of the CRT monitor cable with an
`external video port thereof;
`FIG. 7 is a block diagram of an earlier notebook computer
`system having a VGAcard with a LCD panel interfaceand
`the external CRT port;
`FIG. 8 is an exterior view of a desktop computer having
`ananalog/digital video adapter, showing connection of CRT 50
`monitor and LCD monitor therewith;
`FIG. 9 is a rear view of the desktop computer of FIG. 8,
`for showing connection of the CRT monitor cable and LCD
`monitor cable with two video ports thereof;
`FIG. 10 is a view similar to FIG. 9, showing a VGA card
`having two video ports installed in an expansion slot of the
`computer;
`FIG. 11 is a block diagram of a desktop computer system
`havinga VGAcard in accordance with one embodiment of 60
`the invention;
`FIG. 12 is a schematic diagram of the digital signal
`interface between the transmitter of the VGA card and the
`receiver of the LCD monitor;
`FIG. 13 is a block diagram of the VGA card having a LCD
`monitor cable sensing circuit in accordance with the inven
`tion;
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`US 6,804,724 B2
`
`puter system comprises a central processing unit (CPU) 430,
`a BIOS 440, a main memory 450, an I/O controller 460, a
`video BIOS 421, a video controller 422, a video memory
`423, and a digital transmitter/receiver 424. The digital
`transmitter/receiver 424 is a high speed digital video inter
`connect device for sending video memory data to the LCD
`panel 410 under control of the video controller 422. The
`video controller 422 also generates analog R, G, B video
`signals corresponding to the stored image in the video
`memory 423 and transmits serialized video signals along
`with horizontal and vertical synchronizing signals to the
`CRT monitor 100 through the VGA connector 425. The
`system has a video output path control function that can
`selectively operate the LCD panel 410 and CRT monitor 100
`in response to a special key combination input of the
`keyboard 470. Both LCD panel 410 and CRT monitor 100
`can be operated simultaneously in a dual display mode by
`the key manipulation.
`Referring to FIG. 8, there is shown a desktop computer
`500 in which a CRT monitor 100 and a LCD monitor 600 are
`connected therewith. The LCD monitor 600 is a digital
`display that digitally interfaces with the computer 500. Also,
`the computer 500 has a display adapter having dual display
`function for the VGA analog video type display and the
`digital display in accordance with one embodiment of this
`invention. Reference number 200 denotes a keyboard for use
`with the computer 500.
`The CRT monitor 100 and LCD monitor 600 are con
`nected to the computer 500 via signal cables 110 and 610 as
`shown in FIG. 9. These signal cables 110 and 610 are
`providedwith at one end connectors111and 611so that they
`can be coupled with the counterpartconnectorsor ports 521
`and 522 provided in the computer. Also, connected is the
`keyboard signal cable210 via a connector211.As shown in
`FIG. 10, two video ports 521 and 522 are mounted in a
`displayadapteror video card 520 installedin one of expan
`sionslots511of thesystemmotherboard510.Thekeyboard
`port 512 is also mounted in the mother board 310.
`The computer system adopting such a video card 520 is
`shown in FIG. 11. The computer system comprises a central
`processing unit (CPU) 530, a BIOS 540, a main memory
`550, an I/O controller 560, and a video card 520. The video
`card 520 includes a video BIOS 523, a video controller 524,
`a video memory 525, a digital
`transmitter 526, a VGA
`analog connector 521, and a VGA digital connector 522.
`The video controller 524 generates analog R, G, B analog
`video signals corresponding to the stored image in the video
`memory 525 and transmits the serialized video signals along
`with horizontal and vertical synchronizing signals to the
`CRT monitor 100 through the connector 521. The connector
`521 uses 15-pin D-Sub female VGA connector. Further, the
`video controller 524 outputs parallel digital video data and
`the synchronizing signals to the transmitter 526. The trans
`mitter 526 is made up of a high-speed digital video inter
`connect device, for example Sil 100 chip, a PanelLinkea
`product family of Silicon Images, Inc. This transmitter526
`is used with the pair receiver chip, for example Sil 101,
`which is usually provided in the digital LCD monitor part.
`Basically, the transmitter/receiver is provided for sending
`video data to digital displays, supporting VGA to XGA
`resolutions for TFT-LCD panels. The Sil 100 transmitter
`chip 526 incorporates an advanced coding scheme to enable
`well-known VESA Transition Minimized Differential Sig
`naling (TMDS) for reduced electromagnetic interference
`(EMI) across copper cables and DC-balancing for data
`transmission over fiber optics. To maximize data recovery
`accuracy, the Sil 101 receiver chip oversamples and makes
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`use of a data recovery algorithm to select the most reliable
`data sampling points.
`As shownin FIG.12, the transmitter526 receivesparallel
`digital video data from the hostvideo controller 524. Inputs
`of the transmitter 526 are 6-bit video data (R, G, B),
`horizontal and vertical synchronizing signals (HSYNC,
`VSYNC), 3-bit control signal (CTL), display enable signal
`(DE), clock signal (DCLK). The transmitter 526 encodes
`and serializes the parallel input data by the use of an internal
`PLL circuit. The serialized data is then transmitted to the
`receiver chip 630 of the LCD monitor 600 over four low
`voltage differential channels TX0, TX1, TX2 and TXC, the
`amplitude of which is set by the swing control circuit
`provided in the transmitter 526. Each channel consists of a
`pair of lines that is shown in the drawings by addition of +
`and - thereto. R (red) video data signal is sent over a pair of
`lines TX0+ and TX0-. G (green) video data signal is sent
`over a pair of lines TX1+ and TX1-. B (blue) video data
`signal is sent over a pair of lines TX2+ and TX2-. And the
`differential clock signal is sent over a pair of lines TXC+ and
`TXC-, constituting the differential clock channel.
`Further, the transmitter 526 is applied by two voltages
`DVCC and AVCC. The DVCC is an operating voltage for
`the transmitter 526, for example 3.3 Volts, and the AVCC,
`nominally 3.3 Volts, is provided for the differential level
`swing control circuit (not shown) of the transmitter 526.
`Also, reference numerals AGND denotes the ground of the
`differentialsignaling circuit, and DGND denotes the ground
`of the transmitter chip 526, respectively. Details of the
`TDMS interconnect scheme and the low voltage differential
`signaling (LVDS) method is described in the PanelLinkea
`Technology Product Family Overview, Sil/DS-0001-B, Rev.
`1.0, pp. 11-24, and the relevant parts have been incorporated
`herein for reference.
`The output signal lines of the transmitter 526 are con
`nected to a digital video port 522, called MDR connector,
`provided in the video card 520. Also, a signal cable 610,
`preferably made by flexor twisted pair cables, is prepared to
`connect the MDR connector 522 of the video card 520 to the
`LCD monitor 600 through the counterpart MDR connectors.
`Further, signal cable 610 consists of three data channels, C2,
`CI and CO (red, green and blue, respectively) and one clock
`channel C3.
`In the LCD monitor 600, the receiver chip 630 receives
`the differential signals of the serialized video data and clock
`from the transmitter 526 via the signal cable 610 and the
`other MDR connector 620. Inputs of the receiver 630 are
`corresponding low voltage differential channels RX0, RX1,
`RX2 and RXC. Also, each channel consist of two signal
`lines such as RX0+ and RX0- for the received R (red) video
`data. The receiver 630 includes a termination control circuit
`for the input differential signals, a decoder/deserializer
`circuit, and a PLL circuit, all for the recovery of the original
`parallel data. The receiver chip 630 is also applied by two
`voltages DVCC and AVCC. The DVCC is an operating
`voltage for the receiver, for example 3.3 Volts. The AVCC,
`nominally 3.3 Volts, is provided for the differential signal
`termination control circuit (not shown) of the receiver 630.
`These circuits have been omitted for simplicity of the
`drawings.
`The recovered parallel data, that is 6-bit video data (R, G,
`B), horizontal and vertical synchronizing signals (HSYNC,
`VSYNC), 3-bit control signal (CTL), display enable signal
`(DE), and clock signal (DCLK), outputted from the receiver
`630 are supplied with the LCD panel of the digital monitor
`600.
`
`

`

`Case 3:14-cv-00757-REP-DJN Document 1-8 Filed 11/04/14 Page 26 of 29 PageID# 192
`
`US 6,804,724 B2
`
`As mentioned above, the computer system having such
`video card 520 shown in FIGS. 11 and 12 is capable of using
`either the CRT monitor 100 or the LCD monitor 600, or
`simultaneously both two monitors 100 and 600, if a desired
`video output path has been selected in the BIOS setup
`program. Further, in any cases the signal cable of the
`selected monitor should be connected with the correspond
`ing video port. However, if the user selected the LCD
`monitor 600, for example, the cable of the LCD monitor 600
`may not be connected with the computer system, while the
`CRT monitor cable has been connected therewith. In this
`case, the video output data of the display adapter 520 will
`not be sent to the LCD monitor 600, which results in null
`display of the monitor screen. Further, when the desired
`cable connection has completed, if the selected monitor is
`notsupplied with the power, the monitor will not operate and
`also nothing can be seen on the monitor screen.
`Advantageously, the present invention provides a solution
`for the monitor selection error and/or the cable connection
`failure as well as the power failure in the selected monitor.
`FIG. 13 shows a video card 520a having a LCD monitor
`cable sensing circuit in accordance with the invention. The
`video card 520a has the same configuration as that of the
`video card 520 shown in FIG. 11, except a sensing circuit
`527 provided for detecting connection state of the LCD
`monitor cable. If it is found that the LCD monitor cable has
`connected to the video port 522,
`the sensing circuit 527
`allows the display enable (DE) signal fed from the video
`controller 524 to enter the transmitter 526. Also, if the LCD
`monitor cable is not connected with the video port 522, the
`sensing circuit 527 prevents the display enable (DE) signal
`from being inputted to the transmitter 526. The detailed
`circuit diagram of the LCD monitor cable sensing circuit
`527 is shown in FIG. 14.
`The sensing circuit 527 includes a sense resistor Rl
`provided at a terminal of the MDR connector 620 of the
`LCD monitor part. The resistor Rl is applied by the oper
`ating voltage DVCC. Preferably, one end of the resistor Rl
`is connected to the 26th pin (not used) of the MDR con
`nector 620, and the other end thereof connected to the
`DVCC line of the monitor part 600a. The counterpart MDR
`connector pin provided at the video card 520a is connected
`to an input terminal of the video controller 524. Thus,
`formed is a monitor cable sensing signal (CS) line between
`the LCD monitor 600a and