Classifications

• • 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
• • 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
  • G06F1/1615—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function
  • G06F1/1616—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
• • 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
  • G06F1/1626—Constructional details or arrangements for portable computers with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
• • 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
  • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
  • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
• • 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
  • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
  • G06F1/1684—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675
  • G06F1/1698—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675 the I/O peripheral being a sending/receiving arrangement to establish a cordless communication link, e.g. radio or infrared link, integrated cellular phone
• • 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
  • G06F1/26—Power supply means, e.g. regulation thereof
  • G06F1/32—Means for saving power
  • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
• • 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
  • G06F1/26—Power supply means, e.g. regulation thereof
  • G06F1/32—Means for saving power
  • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
  • G06F1/3234—Power saving characterised by the action undertaken
  • G06F1/325—Power saving in peripheral device
  • G06F1/3265—Power saving in display device
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
  • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
  • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
  • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
  • G09G3/3611—Control of matrices with row and column drivers
  • G09G3/3622—Control of matrices with row and column drivers using a passive matrix
  • G09G3/3644—Control of matrices with row and column drivers using a passive matrix with the matrix divided into sections
• • 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
  • G06F3/1438—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 using more than one graphics controller
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2310/00—Command of the display device
  • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
  • G09G2310/0202—Addressing of scan or signal lines
  • G09G2310/0221—Addressing of scan or signal lines with use of split matrices
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
  • G09G2330/02—Details of power systems and of start or stop of display operation
  • G09G2330/021—Power management, e.g. power saving
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2360/00—Aspects of the architecture of display systems
  • G09G2360/06—Use of more than one graphics processor to process data before displaying to one or more screens
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2370/00—Aspects of data communication
  • G09G2370/02—Networking aspects
  • G09G2370/027—Arrangements and methods specific for the display of internet documents
• • 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
  • G09G5/001—Arbitration of resources in a display system, e.g. control of access to frame buffer by video controller and/or main processor
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
  • H04W52/02—Power saving arrangements
  • H04W52/0209—Power saving arrangements in terminal devices
  • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
  • H04W52/0267—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by controlling user interface components
  • H04W52/027—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by controlling user interface components by controlling a display operation or backlight unit
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
  • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
  • Y02D30/00—Reducing energy consumption in communication networks
  • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

• the present invention relates generally to electronic display devices and in particular to liquid crystal displays in portable electronics equipment.
• One way to increase the operation time of the batteries is to reduce the need of electric power.
• Many devices and methods for reducing the power required during active use of the device are available.
• Another part for saving power is to reduce the power need during stand-by or inactivity periods.
• One large power consumer in a typical portable electronic device is the display unit, typicadly a LCD unit.
• the second one instead reduces the number of pixels, which also reduces the power need for the LCD unit.
• any possible further reduction of the power consumption will be appreciated since it increases the lifetime of a fully charged battery.
• the display units are often quite large and the processing power needed to supply the information to be displayed increases.
• These large display units and the connected processing units require more electric power than e.g. small conventional mobile telephones.
• the power consumption of such devices is too high. Therefore, there is a general need to further decrease the power consumption in portable electronics devices.
• a general problem of portable electronics devices with displays according to prior art is a too high power consumption in relation to the requested battery lifetimes.
• the general object of the present invention is therefore to reduce the power consumption of electronics devices having information displays.
• a further object of the present invention is to reduce the power need during stand-by or inactivity periods.
• Another object of the present invention is to reduce the power consumption of equipment associated with the operation of the display unit, but not necessarily of the display unit itself.
• the display unit comprises according to the present invention at least two interfaces, controlled by one display control unit each.
• the electronics device comprises further an arbitrator, resolving any access conflicts between the interfaces.
• the arbitrator can be implemented as a switching means in the display unit or as a software communication between the display control units.
• the interfaces preferably control mutually overlapping areas of the display unit.
• One of the interfaces may be slow, i.e. having a low bandwidth, and accessed e.g. by a serial connection, being responsible for the information display during stand-by or inactivity periods, when only limited information display is needed.
• the display control device for the other interface and associated circuitry are preferably turned off.
• the other interface is preferably of a fast type, i.e. having a high bandwidth, accessed by e.g. a parallel connection, being responsible for a full utilization of the display unit.
• the advantage with the present invention is that power consuming parts used for controlling the display unit in an active mode can be shut off during stand-by or inactivity periods, since the display control then is performed through a less power consuming alternative display control unit, with a separate interface.
• FIG. 1 is an illustrative block diagram of an example of a mobile telephone according to prior art
• FIG. 2 is a block scheme of an embodiment of a display device according to the present invention.
• FIG. 3 is a block scheme of another embodiment of a display device according to the present invention.
• FIG. 4a is a schematic drawing of a mobile telephone in a folded state
• FIG. 4b is a schematic drawing of a mobile telephone in an open state
• FIG. 4c is a schematic drawing of a part of the mobile telephone shown in fig. 4a and 4b;
• FIG. 5 is a schematic drawing of mobile telephone according to the present invention.
• FIG. 6 is a schematic drawing of a portable computer according to the present invention.
• FIG. 7 is a schematic drawing of a display unit according to the present invention
• FIG. 8 is a flow diagram illustrating a display control method according to the present invention.
• a display device 10 comprises a display unit 1 1 , which is controlled by a display control unit 12, which in this example is a part of a central processing unit (CPU) 13.
• the display control unit 12 is connected with an interface 14 of the display unit via a connection 15.
• the CPU 13 is used for processing the large information amounts necessary for e.g. the Internet access.
• the CPU 13 is connected to memory devices 20, 21 such as random access memories.
• the telephone In order to communicate with any telecommunication network, the telephone is equipped with a radio unit 18 and an antenna 19 for transmitting and receiving radio signals.
• the radio unit is connected to a base band controller 17, which in turn is connected to the CPU 13.
• the interface 14 may be of different kinds, e.g. partial screen solution, where an active part of the display 16 may be changed from time to time, depending on the present mode of operation.
• the reduction of the power consumption of the display 1 1 is well developed, e.g. by using partial screen solutions etc.
• the power consumption of the radio unit 18 is mainly determined by the efficiency in antenna functions, which will not be further discussed here.
• the base band controller 17 has quite limited power consumption and does not require immediate attention.
• the CPU in particular for devices equipped for advanced tasks such as Internet access, requires a lot of electric power.
• the CPU is shut-off during e.g. stand-by periods.
• the display unit has to be activated regularly. This updating of the stand-by information is normally performed by starting-up the CPU unit 13, deliver necessary information to the display interface 14 and turn off the CPU 13 again.
• such procedures normally also involves e.g. the memories 20, 21 , which all together costs unreasonable amounts of power.
• the basic idea of the present invention is to provide an extra interface and control unit to the display unit in order to be able to have a display access requiring less power.
• This idea is applicable to all types of display-provided electronics devices having an active mode with intensive display operation and a stand-by mode with a sparse display operation.
• the display unit has to be provided with at least two interfaces.
• LCD units exist today, which enables a selection to use the interface either as a serial or as a parallel interface, but these interfaces are mutually exclusive since the choice of interface is performed upon physically connecting the hardware.
• the display device 10 comprises a display unit 1 1 , preferably a LCD (liquid crystal display) unit.
• the display unit 11 comprises a first interface 39 and a second interface 38.
• the first interface 39 is connected to a first display control unit 30 via a first display connection 34 and the second interface 38 is connected to a second display control unit 31 via a second display connection 33.
• the second display control unit 31 is in the present embodiment implemented as a part of a central processing unit
• the control units 30, 31 are preferably implemented by microprocessors.
• the CPU 32 and the first display control unit 30 are interconnected with an interconnection 37, and are both parts of the same processing unit 35, although being independently operable parts.
• the first display control unit is supplied with stand-by information via a connection
• the origin of such stand-by information could be within the processing unit 35, within the display device 10 or from an external source.
• the first interface 39 of the display unit 1 1 is arranged for operating the display unit 11 in a first display mode, accessing a first display area 41 of the display.
• the second interface 38 of the display unit 1 1 is similarly arranged for operating the display unit 11 in a second display mode, accessing a second display area 40 of the display.
• the first display area 41 and the second display area 40 are mutually overlapping, and preferably, the first display area 41 constitutes a sub-area of the second display area 40.
• each of the interfaces 38, 39 has its own display control unit 31 , 30, there might be a conflict in accessing the display unit 11.
• an arbitrator 42 is provided.
• the arbitrator 42 is in this embodiment a double switch controlled by the CPU 32.
• the CPU 32 When a high display activity is needed, the CPU 32 is intensively involved in processing the corresponding data.
• the second interface 38 is active and the large second display area 40 is used.
• the arbitrator 42 keeps the display connection 33 closed, and prevent any information flow on display connection 34. Some information may arrive on the stand-by information connection 36, and is treated by the CPU, before being presented at the display through the second interface 38.
• the arbitrator 42 turns the responsibility for the display control over to the first display control unit 30 and connects the first interface 39.
• the CPU 32 and the second display control unit 31 are shut-off in order to reduce the power consumption.
• the stand-by period only some limited stand-by information is received via the connection 36.
• This stand-by information is received by the first display control unit 30, which updates the display accordingly. This means that during the stand-by period, only the power low-consuming first display control unit 30 is active.
• the CPU 32 is started-up again, and resumes the display control function.
• the first display connection 34 may therefore preferably be a serial connection with a relatively low transmission rate, i.e. a low-bandwidth connection.
• the first display area 41 is also preferably small, thereby reducing also the power need for the display unit.
• a partial screen solution may be used.
• the second interface 38 is supposed to be used during high-activity periods.
• the demands for transfer of display information are much larger, and the second connection 33 is therefore preferably a parallel connection, offering a high information rate to the display unit, i.e. a high-bandwidth connection.
• the second display area 40 is preferably larger than the first one 41. Since there is no conflict in driving the display in the two modes, the areas 40, 41 may be mutually overlapping, and preferably the second display area 40 will cover whole the first display area 41 , for using the maximum capacity of the display unit.
• Fig. 3 illustrates another embodiment of a display device according to the present invention. Similar parts are denoted by the same reference numbers and are not further discussed.
• the stand-by information is exemplified by the status of the power supply of the processing unit 35.
• a battery 45 is connected to a regulation unit 46, which supplies an operation voltage Vdd via a power supply connection 47 to the processing unit.
• a voltage level connection 48 transfers the voltage level of the battery 45 to an analogue-to-digital converter 44 in the processing unit. The result is transferred over to the first display control unit 30. During high-activity operation, this battery status information is forwarded to the CPU 32.
• the arbitrator is provided as a switch 43 at the display unit 11.
• the switch is alternately connecting either of the interfaces 38, 39.
• the switch is preferably software controlled by e.g. the CPU 32 or the first display control unit 30.
• Fig. 4a-c schematically illustrates a mobile telephone 50 with functionality to Internet access.
• the telephone 50 is illustrated in a folded configuration, where a base unit 51 is partially covered by a lid 52.
• a display device 53 is arranged at the front side of the base unit 51.
• the lid 52 is folded over the base unit 51, as illustrated in fig. 4a, only a minor first part 54 of the display is visible.
• the telephone may be used as an ordinary mobile telephone, and the first part 54 of the display unit displays necessary information.
• the telephone 50 is folded up, by turning the lid 52 away from the base unit 51.
• the whole display area 55 of the display device 53 is visible and is available for displaying e.g. Internet information.
• fig. 4c the display part of the telephone illustrated in fig. 4a and 4b is shown.
• the first part area 54 and the whole display area are drawn together, pointing out the difference in display requests.
• Such a telephone will greatly benefit from a display device according to the present invention.
• the base band controller 17 is provided with a first display control unit 30, connected by a first display connection 34 to a first interface 39 controlling a first area 54 of the display 11.
• the CPU 13 is as before provided with a second display control unit 31, connected by a second display connection 33 to a second interface 38 controlling a second area 55 of the display 1 1.
• the arbitrator 60 is in this embodiment implemented as a software communication over the interconnection between the base band controller 17 and the CPU 13, handling the access rights to the interfaces 38, 39.
• the second display control unit 31 When the mobile telephone is operated in the Internet mode, the CPU 13 is fully utilized, the second display control unit 31 has the control over the display 11 according to the arbitrator 60 communication.
• the full screen is operable.
• the only information normally displayed is the signal strength, the status of the battery charge and the time and date.
• the base band controller readily provides this information.
• the CPU 13 is accordingly shut-off, and the arbitrator 60 hands over the display control to the first display control unit 30.
• Such a shut-off of the main CPU 13 at inactivity periods is known in prior art.
• the smaller first area 54 at the display 11 is now available for the limited information necessary and the power consumption of the CPU 13 and the memories 20, 21 is now totally avoided.
• the display is provided with two interfaces, which are driven by two independent display control units 30, 31.
• One unit 31 is associated with a power-consuming high-activity processing unit 13, and has access to a large display area 55.
• the other 30 is independent of the power-consuming high-activity processing unit 13 and may therefore drive a smaller area 54 during low-activity periods, hence reducing power consumption and prolonging battery life.
• Fig. 6 illustrates another interesting device, which advantageously is provided with a display device according to the present invention.
• a portable computer 70 comprises a bottom part 72 and a top part 71, which are foldable against each other.
• the bottom part 72 is provided with keys, mouse functions etc. according to prior art.
• the top part is provided with a large
• the whole screen area 74 is normally used to display necessary information.
• the computer and the display operate in a high consuming power mode.
• the only information that normally has to be updated is the time and battery charge indicator, located in a limited screen area 75.
• the main processors may be turned off, saving power, while a simple power low-consuming display control is made responsible for the update of the stand-by information.
• FIG. 7 schematically illustrates a preferred embodiment of a display unit according to the present invention.
• a LCD unit 11 comprises a LCD area 53.
• a row driver 82 and a column driver 81 control the LCD area 53.
• the column driver is comprised in a driver control unit 80.
• a first interface 39 and a second interface 38 are the inputs of the driver control unit 80.
• the driver control unit further comprises a control block 89 and a display RAM 90.
• the first interface 39 is in this embodiment constituted as a serial interface, having a serial data input/ output connection 83 and a serial clock connection 84.
• the second interface 38 is in this embodiment constituted as a parallel interface, having a 16 bit bi-directional data bus 85, a command/ data select signal connection 86, a read strobe connection 87 and a write strobe connection 88.
• the interfaces according to the present invention are thus simultaneously physically connectable, but only operated one at the time.
• An arbitrator implemented either in the display unit itself or in associated units, performs this arbitration.
• a block 48 within the control block 89 performs the arbitration.
• Fig. 8 is a flow diagram illustrating a display control method according to the present invention.
• the process starts in step 100.
• step 102 an arbitration process is made.
• it is determined whether the display is going to be driven in a first mode or not. If the first operation mode is to be selected, a first display unit interface is driven in step 104, operating the associated display in the first mode. However, if the first mode is not of interest, a second display unit interface is driven, in step 106, operating the associated display in a second mode.
• the process is ended in step 108.
• the illustrated process should not be interpreted as a regular flow diagram, but rather illustrate the alternating access to the two display modes.
• the principle of independently operating interfaces may be implemented on more than two interfaces, adjusting the display control to the activity level in several steps.
• a possible case would be the mobile telephone, earlier described, where a first mode could be a pure stand-by mode, a second mode may be a normal telephone mode and a third mode could be an Internet mode. These modes require different amount of display area and different processing power.

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• Engineering & Computer Science (AREA)
• Theoretical Computer Science (AREA)
• Computer Hardware Design (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• General Engineering & Computer Science (AREA)
• Human Computer Interaction (AREA)
• Chemical & Material Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Mathematical Physics (AREA)
• Control Of Indicators Other Than Cathode Ray Tubes (AREA)
• Liquid Crystal Display Device Control (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (6)

Cited By (11)

Families Citing this family (5)

Citations (3)

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• 1999
  • 1999-11-25 SE SE9904271A patent/SE516923C2/sv not_active IP Right Cessation
• 2000
  • 2000-11-08 WO PCT/SE2000/002179 patent/WO2001039167A1/en active Application Filing
  • 2000-11-08 JP JP2001540753A patent/JP2003515765A/ja active Pending
  • 2000-11-08 AU AU15645/01A patent/AU1564501A/en not_active Abandoned
  • 2000-11-08 EP EP00978159A patent/EP1254449A1/en not_active Withdrawn
  • 2000-11-08 CN CNB008162344A patent/CN1172283C/zh not_active Expired - Lifetime

Patent Citations (3)

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