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WO1997003434A1 - Ordinateur ultra-portable - Google Patents

Ordinateur ultra-portable Download PDF

Info

Publication number
WO1997003434A1
WO1997003434A1 PCT/US1996/011632 US9611632W WO9703434A1 WO 1997003434 A1 WO1997003434 A1 WO 1997003434A1 US 9611632 W US9611632 W US 9611632W WO 9703434 A1 WO9703434 A1 WO 9703434A1
Authority
WO
WIPO (PCT)
Prior art keywords
computer
head
coupled
mounted display
computer system
Prior art date
Application number
PCT/US1996/011632
Other languages
English (en)
Inventor
C. Gregory Amadon
Original Assignee
Virtual I/O, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Virtual I/O, Inc. filed Critical Virtual I/O, Inc.
Publication of WO1997003434A1 publication Critical patent/WO1997003434A1/fr

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
    • G06F21/82—Protecting input, output or interconnection devices
    • G06F21/84—Protecting input, output or interconnection devices output devices, e.g. displays or monitors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/163—Wearable computers, e.g. on a belt
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
    • G06F3/0202—Constructional details or processes of manufacture of the input device
    • G06F3/0221—Arrangements for reducing keyboard size for transport or storage, e.g. foldable keyboards, keyboards with collapsible keys
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G5/006—Details of the interface to the display terminal

Definitions

  • the present invention relates to a full-function portable computer which preferably may be smaller than a notebook computer and in particular to a portable computer with a head-mounted display.
  • keyboards Similar considerations apply to input devices such as keyboards.
  • Some keyboards have been provided which are compact such as being about the size ofthe notebook display screen.
  • little effort has been expended on providing more comfortable and convenient input devices since it has been believed, in the past, that foll-functionability could not, practically, be achieved in a device having a footprint smaller than the typical notebook computer display device.
  • it would be advantageous to provide a foil-function computer which is not practically limited by the display screen size, so that smaller and/or more portable keyboards can be advantageously provided.
  • Portable computing devices previously have been further limited in te ⁇ ns of convenience by requiring that some or all components be manually carried from place to place, such as in a fashion similar to a "notebook” or similar to luggage (portable computer often being provided with carrying cases for this purpose). Accordingly, it would be useful to provide a full-function computer which could be transported more conveniently than by manually carrying the computer, and preferably while reducing the number of separate units which the user must transport, as noted above.
  • a number of devices have been designed which can provide computer video output directly to the eyes of a user such as by a head-mounted display or helmet-mounted display.
  • Examples of such devices include those described in U.S. Patent 5,303,085, and serial numbers 08/416,838; 08/416,919; 08/416,840 and PCT/US94/01390, incorporated herein by reference.
  • One difficulty with such previous devices is that they are typically configured for use with relatively heavy computers and require the user to be coupled thereto, e.g., by a cable for transmitting the video signal from the computer to the head-mounted display.
  • Even when head-mounted displays are coupled to, for example, laptop computers, such systems are unnecessarily large and heavy, e.g., because these devices provide, typically, a display screen.
  • Portable computers such as laptop and notebook computers commonly suffer from a number of deficiencies.
  • One such deficiency is that these devices typically provide video output on a screen which provides insufficient privacy protection in the sense that another person can view the screen display "over the shoulder" ofthe user.
  • Even if a laptop computer user is using an alternative display such as a head-mounted display, there is no convenient and completely satisfactory way of preventing display on the laptop main display screen.
  • an alternative viewing device such as a head-mounted display typically will not be looking at the screen ofthe computer, there is a risk that unbeknownst to the user, the main display screen ofthe laptop may switch to a mode which displays on the main screen while the user is using the alternative device, thus compromising privacy.
  • the present invention relates to a computer which provides for ease of use and portability, e.g., for the business traveler, preferably having convenient communication facilities such as cellular phone capability.
  • the apparatus is extremely compact, having a footprint which is approximately the size of a PCMCIA device. This small footprint can be achieved since it is possible to dispense with the typical display screen by using a head-mounted display for the primary and/or sole display output.
  • the input device can also be compact such as a foldable keyboard which may communicate with the computer through an infrared, radio or other wireless link.
  • the computer includes a 486-style processor on a first PCMCIA and a cellular phone on a second PCMCIA, optionally with a hard drive or other memory or storage device on a third PCMCIA, mounted preferably in stacked fashion and coupled to a power supply such as a battery via a backplane/PCMCIA carrier.
  • the primary output ofthe computer is a head- mounted display device and the primary input is a wireless keyboard.
  • the main chassis ofthe computer can be provided with a much lighter weight and provided at a lower cost than previously. Furthermore, the requirements for the physical size the computer are reduced. This reduction in weight and/or size requirements can be taken advantage of in several ways.
  • a smaller and/or lighter weight system is provided and the system may be sufficiently small that the device can be conveniently worn by the user, e.g., on a belt loop, shoulder strap, harness, or as part ofthe head-mounted device.
  • the system can be provided with a larger keyboard than provided in previous devices without providing a system whose overall size (excluding the head-mounted display, if any) is comparable to that of currently-available systems having a built-in display screen.
  • the built-in screen display which is typically an LCD or active matrix display, is difficult to read because of its small size and/or lack of contrast.
  • the present invention can supply the user with a display having the appearance ofa large-size display with contrast which is largely controllable since there is little if any variation in viewing angle.
  • the head-mounted display and/or keyboard communicates with the portable computer via a cable.
  • some or all ofthe communication is provided using a wireless link such as an infrared communication link, a radio communication link or the like.
  • the device in order to provide a system which is extremely portable, the device is configured with the folding keyboard.
  • input e.g., keyboard
  • output e.g., video
  • the full-function comptuer avoids the need for manual transportation by making some or all components ofthe foil-function device substantially wearable.
  • the main computing device is sufficiently small and lightweight that it can be worn, e.g., on a belt loop.
  • the computing device is incorporated into the head-mounted display so that a foll-fonction computer and video display unit is wearable on the user's head.
  • a foll-fonction computer and video display unit is wearable on the user's head.
  • an input device such as a foldable keyboard
  • headtracker and/or eyetracking as an input device so that the head-mounted computer contains both input and output functions as well as foil computing functions all mounted on the user's head.
  • the present invention provides a system which can be more easily used and accepted by the traveling public, e.g., since such a device can be easily used on an airplane or other transportation mode without the user risking disclosure of sensitive business or other information.
  • the invention also provides for ease of coupling the head-mounted display to display some or all of airline video information such as flight safety information and/or in-flight movies or other entertainment.
  • the head-mounted display is provided with a coupling which is configured to fit into and operate with either a computer video output device or an aircraft in-flight video output coupler.
  • the computer is coupled to and receives airline video data such as in-flight entertainment andor safety video data and outputs to the head-mounted display both information from the airline source and from the computer source, e.g., in a split-screen or picture-within-a-picture mode or in a switchable fashion.
  • a device configured in this fashion will be arranged so that safety information and/or emergency info ⁇ nation will ove ⁇ ide computer output so that this information can be provided to the user ofthe head-mounted display preferentially.
  • the computer can be coupled to a communication link such as a radiotelephone, mobile telephone, cellular telephone or other communication link so that the user can access remote information while maintaining privacy.
  • a portable computer is provided with a head- mounted display in such a way that video display privacy can be protected.
  • audio output privacy can also be protected.
  • the portable computer contains no built-in display screen. In this way, there is no danger that the display screen may be inadvertently activated unbeknownst to a privacy display user.
  • a display screen is provided or can be optionally attached, but the computer is provided with a coupling mechanism whereby when a head- mounted display is coupled to the computer, the screen is automatically disabled from providing output.
  • the head-mounted display is provided with an audible or visible warning signal when the portable computer screen display (if any) is activated.
  • audio headphone output which may be built integrally with a head-mounted display device.
  • the portable computer can be provided without a built-in speaker or other audio output device.
  • a portable computer can be provided such that when a headphone unit is coupled to the computer, the built-in speaker is automatically disabled.
  • a system can be provided in which a video or audio warning is provided to a user if the built-in speaker ofthe computer is activated.
  • FIG. 1 is a block diagram of a portable computer according to previous devices
  • Fig. 2 is a block diagram of a portable computer with privacy output according to an embodiment ofthe present invention
  • Fig. 3 is a drawing of a foldable keyboard according to an embodiment ofthe present invention
  • Fig. 4 is a schematic diagram of an apparatus for disconnecting built-in screen output upon connecting the head-mounted display device;
  • Fig. 5 is a block diagram of a small-footprint portable computer according to an embodiment ofthe present invention
  • Fig. 6 is a perspective partially exploded view of a wearable computer according to an embodiment ofthe present invention
  • Fig. 7 is a perspective view of a combination 386/486 PC computer and cellular phone according to an embodiment ofthe present invention.
  • Fig. 8 is an exploded perspective view ofthe embodiment of Fig. 7.
  • previous portable computer devices provided a main computer chassis 102 having a CPU 104 coupled to a key board 106 a screen display 108 and typically having a speaker 110.
  • the CPU 104 contains output ports 112a, 112b which can be used for various purposes such as outputting information to auxiliary displays, to headphones, to printers, modems and the like.
  • Fig. 2 depicts a portable computer according to an embodiment ofthe present invention.
  • the chassis 102 is not coupled to a screen display. Instead, the chassis 102 is coupled to a head-mounted display 114 and, optionally, headphones 116.
  • Fig. 5 depicts an embodiment in which the apparatus has a footprint with a width and depth similar to the size ofa PCMCIA card, i.e., about 8.5cm. by about 12.5cm.
  • the computer 502 is made up ofa column or a stack of PCMCIA cards held in place by coupled PCMCIA caniers adjacent a backplane 504 for communication among the cards and which may also contain the battery or other power source.
  • a first PCMCIA card 506 includes a processor such as a 386 or 486-type processor and associated buses, memory and input and output devices, such as the type of card available under the trade name Epson card-386 (SLE8632509) and sold by Seiko Epson.
  • a second PCMCIA card 508 is coupled to the processor card 506 via backplane 504 with the second card 508 containing data storage.
  • a number of data storage devices can be used such as a hard disk, an array of random memory devices, optical storage and the like.
  • One memory device which can be used is that which is available as model EHDD260 ("260MByte Hard drive") from Seiko Epson.
  • a third PCMCIA card 510 again coupled by a backplane 504 to the processor card 506, can be used to provide communication capability.
  • the communication card provides telephone functions, e.g., modem capability for coupling the computer 506 to other computers, to on- line services, to local or national or intemationai networks such as the Internet.
  • the computer is preferably also coupled to a telephone such as a cellular.
  • a telephone such as a cellular.
  • the card may be provided with a cellular telephone antenna 512 or may be provided with a telephone Tl jack 514 e.g., for coupling to a land line using an onboard modulator-demodulator (modem).
  • the telephone card 510 can also be provided with a coupler 516 for attaching a handset and/or telephone keypad for using the computer 502 as a voice communication device. Communication to the handset/keypad can be either by way of a cable or through a wireless link such as an infrared or radio link.
  • a number of other components 518 can also be coupled to the computer 506 via the backplane 504 such as auxiliary batteries or other power devices, floppy disk drives, CD-ROM drives, soundboards or other multimedia hardware, and the like.
  • video output is via an HMD 520 preferably communicating over a wireless link such as an infrared or radio link 520.
  • An input device such as a keyboard, pen input device, mouse, trackball or joystick 524 can be coupled to the backplane 504 via a wireless link 526.
  • the footprint ofthe computer 502 has a width 532 of about 14-20cm. which is only slightly larger than the width 534 ofthe PCMCIA card in its canier and has a depth 536 approximately equal to the depth of a PCMCIA card and canier.
  • the computer 502 has a width 532 of about 19cm. and a depth 536 of about 10cm.
  • the height 538 will depend on how many components and caniers are included in the package. In an embodiment in which only the processor 508, data storage 506 and cellular phone 510 components are included, the height may be, e.g., about 7cm. If a battery pack is attached, the effective height may be greater. Using this configuration, a foil functioning computer can be provided 502 which has a relatively small weight.
  • the device is particularly convenient for a traveler such as a business traveler since the highly compact and lightweight computer 502 is small enough to be conveniently worn, e.g., on a belt, shoulder strap etc. and the input and output 520, 524 can be used without the need to attach via cables. Further space and weight reduction is obtained by using a common power source 504 for both the computer and the telephone, thus freeing the user from the need to carry separate battery packs, AC converters, chargers and the like for both a telephone and a computer.
  • the computer 502 can be provided with audio capability for recording sounds such as voice.
  • the computer 502 can alsorhythm as an electronic dictaphone with the added capability of downloading dictation, instructions etc., at high speed, e.g., over a phone line, Internet, local network etc., for processing by a secretary, word processing department etc.
  • the instructions and dictation can be transmitted at minimal telephone or other communications cost.
  • the computer 102 does not have a screen display, it is impossible for others to compromise display privacy by viewing a screen "over the shoulder".
  • computer 102 does not have a built-in speaker 110, it is impossible for others to hear audio output which is output by the computer.
  • the computer 102 can optionally be coupled to a display screen 108 (either built-in, as in the case of common laptop configurations, or attachable by a user.
  • a display screen 108 either built-in, as in the case of common laptop configurations, or attachable by a user.
  • it is prefened, in this embodiment, to construct the coupling 118 by which the head-mounted display 114 communicates with the computer 102 in such a way that whenever the head-mounted display 114 is coupled to the computer, the display screen 108 is automatically decoupled or is automatically configured to warn the HMD user of activation ofthe screen display. In one embodiment, this is achieved by providing a plug in the computer 102 which receives a complimentary plug at the end of a head-mounted display cable.
  • one socket of the coupling 118 in the computer for receiving a head-mounted display coupler pin 402 has a spring- mounted 406 cap 405 coupled to a lever 408 which controls a switch 410 thus, when the user inserts the head-mounted display cable plug into the computer video port plug 118, pin 402 causes cap 405 to move against the urging of spring 406, moving lever 408 about pivot point 409 opening switch 410.
  • 410 can be used to control the power supply to the screen 108.
  • a standard shorting jack can also be used for this purpose.
  • the apparatus can be configured so that the power line providing power to the built-in display 108 is coupled to a sensor 422 which provides screen power status information to the CPU 104.
  • the CPU 104 is configured to output a warning signal to the head- mounted display 114 and/or headphone 116 whenever the sensor 422 senses that the screen 108 is being supplied with power.
  • this warning feature can be provided regardless of whether the plug switch 410 feature is provided.
  • the keyboard 302 can be provided with two or more sections 304a, 304b, 304c which pivot around hinges 306a, 306b so that the keyboard 302 can be folded for carrying and/or storage.
  • This configuration becomes feasible in a computer which does not have a built-in screen 108.
  • Screens 108 typically cannot be folded and thus, in previous devices, the minimum "footprint" that could be provided to a user was largely dependent on the size ofthe screen. Because users typically require at least a minimum size screen, there was little point in providing key boards which could be folded or otherwise compacted into a smaller shape since the device as a whole could not be smaller than the screen size. In the present invention, however, since it is not necessary to provide a built-in screen, it becomes much more advantageous to take advantage ofthe ability to fold or otherwise compact other components such as keyboard components as depicted in Fig. 3.
  • Fig. 6 depicts another embodiment in which the foil-function computer is incorporated as part ofthe head-mounted display to provide a foll-fonction wearable computer, preferably a head-mounted computer.
  • the HMD includes image sources such as LED rays 602a 602b.
  • a first printed circuit board 604 provides the electronics for driving the image sources 602a 602b, e.g., as described in U.S. patent application serial number 08/416,919, incorporated by reference.
  • a backplane 606 provides for communication among the HMD board 604, the computer PCMCIA 506 and the data storage PCMCIA 508. In this case, the backplane 606 does not contain the power supply or source.
  • the housing 100 includes a battery pack or other power supply which communicates via cable 34 with the HMD computer 608.
  • An optional cable 134 can be provided for recharging and/or providing external power to the unit if desired.
  • the housing 100 can, if desired, also house a headtracker and/or a mechanism for adjusting straps 104a 104b.
  • a cover 610 which may be attached to a forehead brace 612 and may include user controls 614a 614b and/or LED or other lights or indicators 616 covers the electronics 608.
  • the memory device 508 can be used for a number of purposes including storing game software or other software for generating the images to be displayed, storing movies or other audio/video entertainment or presentations and the like.
  • the cellular phone may be integrated with the computer in a number o fashions. They may share the same power source, either simultaneously or switchably.
  • the computer speaker output may be sent to the cellular phone speaker and/or the HMD headset.
  • the cellular phone microphone may provide input to a "soundboard"-type microphone input ofthe computer or, as noted above, the HMD may have a microphone coupled to it for user voice input, such as for telephone communication and/or voice recognition. If desired voice recognition can be used as the primary input device so that a keyboard may not be necessary.
  • the device can be provided with a mouse input port, it is possible to use eyetracking devices in the HMD to emulate mouse controls.
  • the HMD provides headphones and a microphone
  • the cellular phone can also be integrated with he computer by way of data sharing via a modem which can be integrated on the backplane or PC board ofthe device with appropriate backplane connections to the cellular phone for enabling data communications over a cellularular telephone link (and/or land line) using the modem.
  • a modem can be integrated on the backplane or PC board ofthe device with appropriate backplane connections to the cellular phone for enabling data communications over a cellularular telephone link (and/or land line) using the modem.
  • the PC board in addition to providing a substrate for holding the PCMCIA caniers or sockets, and providing communications lines, also can be used for power supply (power conditioning and level control), and to provide computer bus functions ("glue logic").
  • the board may also provide circuitry for enabling or taking advantage of power saving features ofthe computer card, wherein functions and/or devices which are unused for at least a certain minimum time are powered-down, preferably so as to permit later powering up substantially without loss of functions or data.
  • the device includes a cellularphone upper cover (ofthe "flip-phone” style) with an area for accessing a speaker, a microphone and a phone-type keypad
  • the cellular telephone printed circuit board 812 can be any of a number of types such as one from an Ericsson KRC 113193 cellular phone, providing normal cellular phone functions and components such as speaker 814, keypad 816, display 818.
  • Hard disk drive card 820 a PCMCIA socket 822, a 386/486 computer PCMCIA 824, a keyboard port 826, a mouse port 828, a jack for an external power supply (such as from an AC/DC converter) 830, a socket for an HMD video port 833, another PCMCIA socket 836, a back cover 838 and a battery pack 840, which may be ofthe normal cellular phone battery back style, and a housing 842.
  • a Hard disk drive card 820 a PCMCIA socket 822, a 386/486 computer PCMCIA 824, a keyboard port 826, a mouse port 828, a jack for an external power supply (such as from an AC/DC converter) 830, a socket for an HMD video port 833, another PCMCIA socket 836, a back cover 838 and a battery pack 840, which may be ofthe normal cellular phone battery back style, and a housing 842.
  • the device can provide an additional PCMCIA slot so a user can easily add further functionality such as additional memory or othersolutions commonly provided via a PCMCIA connection.
  • the computer is a foiltreatment computer operating under a DOS and/or Microsoft Windows operating system or user interface, as opposed to the operating systems of a typical "personal communications device" which is typically not DOS based.
  • a circuit board 844 which is generally parallel to the computer card 824 and memory card 820, provides theterios ofthe backplane, such as communications among components (bushes), power supply/regulation, and the like.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Human Computer Interaction (AREA)
  • Computer Security & Cryptography (AREA)
  • Software Systems (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

La présente invention concerne un ordinateur portable (502) qui préserve le caractère confidentiel des signaux de sortie vidéo ou audio, ou les deux. Dans un mode de réalisation, l'ordinateur (502) ne fournit à la sortie ni texte ni éléments graphiques, sauf à un système d'affichage (520) que l'utilisateur porte sur la tête. Dans un mode de réalisation, le branchement d'un système d'affichage (520) porté sur la tête à un ordinateur (502) coupe automatiquement les signaux de sortie destinés à l'écran. Dans un mode de réalisation, si la sortie correspondant à l'écran est à l'état actif, cela est détecté et signalé à l'utilisateur du système d'affichage (520) monté sur la tête.
PCT/US1996/011632 1995-07-12 1996-07-12 Ordinateur ultra-portable WO1997003434A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US106995P 1995-07-12 1995-07-12
US60/001,069 1995-07-12

Publications (1)

Publication Number Publication Date
WO1997003434A1 true WO1997003434A1 (fr) 1997-01-30

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US6791580B1 (en) 1998-12-18 2004-09-14 Tangis Corporation Supplying notifications related to supply and consumption of user context data
US6801223B1 (en) 1998-12-18 2004-10-05 Tangis Corporation Managing interactions between computer users' context models
US6812937B1 (en) 1998-12-18 2004-11-02 Tangis Corporation Supplying enhanced computer user's context data
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US7055101B2 (en) 1998-12-18 2006-05-30 Tangis Corporation Thematic response to a computer user's context, such as by a wearable personal computer
US7073129B1 (en) 1998-12-18 2006-07-04 Tangis Corporation Automated selection of appropriate information based on a computer user's context
US7076737B2 (en) 1998-12-18 2006-07-11 Tangis Corporation Thematic response to a computer user's context, such as by a wearable personal computer
US7080322B2 (en) 1998-12-18 2006-07-18 Tangis Corporation Thematic response to a computer user's context, such as by a wearable personal computer
US7107539B2 (en) 1998-12-18 2006-09-12 Tangis Corporation Thematic response to a computer user's context, such as by a wearable personal computer
US7225229B1 (en) 1998-12-18 2007-05-29 Tangis Corporation Automated pushing of computer user's context data to clients
US7231439B1 (en) 2000-04-02 2007-06-12 Tangis Corporation Dynamically swapping modules for determining a computer user's context
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