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
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
  • H04B10/25—Arrangements specific to fibre transmission
  • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
  • H04B10/25751—Optical arrangements for CATV or video distribution
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/41—Structure of client; Structure of client peripherals
  • H04N21/426—Internal components of the client ; Characteristics thereof
  • H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
• • 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
  • G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and 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
  • G09G2370/00—Aspects of data communication
  • G09G2370/12—Use of DVI or HDMI protocol in interfaces along the display data pipeline
• • 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
  • G09G2370/18—Use of optical transmission of display information

Definitions

• the present invention further relates to a method for transmitting, in particular at least one DVI data connection and / or at least one HDMI data connection associated, at least partially, in particular at least periodically, TMDS coded signals from at least one data source to at least one data sink according to the preamble of claim 12.
• High-resolution display units (flat) screens, displays, televisions and monitors have an electrical connection interface, in particular in the form of a DVI data transmission interface and / or HDMI data transmission interface.
• DVI data transmission interface in particular in the form of a DVI data transmission interface and / or HDMI data transmission interface.
• several differential TMDS-coded signals for the transmission of audio and video data as well as the required clock signal are routed via this interface between at least one data source and at least one data sink.
• TMDS Transition-Minimized Differential Signaling
• DVI Digital Visual Interface
• HDMI High
• TMDS-coded signals can have data rates in the region of several gigabits per second.
• BV Silicon Image Inc., Sony Corporation, Thomson Inc., Toshiba Corporation
• the connection reference voltage or supply voltage defines the upper voltage value for each of the two terminals of the differential signal, while the lower voltage value is determined by the power source of the HDMI source and by the termination resistor at the sink.
• the terminating resistance and the characteristic impedance of the cable must be matched.
• the electrical connection between the connection interface of the data source and the connection interface of the data sink is effected, for example, by means of a copper cable KK (with impedance Z 0 per differential copper wire pair, see Fig. 3).
• the TMDS coded signals are provided as the output current signal from the data source by means of an output current driver (Transmitter TM with current source SQ and double switches D, D ', see Fig. 3).
• the correct line termination takes place in the receiver via the DC-coupled transmission channel KK between the data source and the data sink (receiver RC, see Fig. 3).
• the input voltage required for the input amplifier EV is determined on the basis of the supply voltage AV ⁇ . Signal voltage generated.
• Fig. 3 shows what has been described above with respect to the prior art in the form of a conceptual schematic diagram for a differential TMDS signal, it being further seen from Fig. 3 that the receiver RC takes over the DC supply to the output current driver of the transmitter TM , Furthermore, the data source connection interface provides a voltage supply on the order of about five volts for the data sink, which may be loaded at a maximum of about 55 milliamps.
• TMDS-coded signals of one HDMI data connection per differential pair of wires AD, AD '(see Fig. 3) of the copper cable KK should be able to support data transmission rates of several gigabits per second. This requires that very high quality and therefore expensive copper cables must be used, if longer distances between the data source and the data sink must be overcome.
• Data connection and / or at least one HDMI data connection assigned, at least partially, in particular at least periodically, to provide TMDS-encoded signals from at least one data source to at least one data sink ready.
• This object is achieved by a circuit arrangement having the features specified in claim 1 and by a method having the features specified in claim 12.
• Advantageous embodiments and expedient developments of the present invention are characterized in the respective subclaims. Using the circuit arrangement as well as the circuit technology according to the present invention, at least one cable-based connection can be realized which requires no further electrical supply-except for the electrical supply, which already exists at the electrical contacts anyway.
• signals which are TMDS-coded at least partially, in particular at least in time sections can be transported by at least one data source to at least one data sink via optical signal transmission, in particular Base at least one DVI data connection and / or at least one HDMI data connection.
• the expert in the present technical field for example a specialist in communications engineering with a sound knowledge in the multimedia area, will appreciate in particular the dispensability of an additional external power supply in relation to the present invention;
• the supply of the at least one driver circuit or the at least one transimpedance converter circuit is provided according to the invention solely by means of the voltages and currents provided at the connection interfaces, in particular at the DVI transmission interfaces or at the HDMI transmission interfaces, the data source and the data sink he follows.
• the present invention thus makes use of the fact that the power supply of the at least one driver circuit or the at least one transimpedance converter circuit does not originate from one (or even more) additional external power source (s), but rather from the connection interfaces of the data source or the data sink can be made available.
• the circuit arrangement with the at least one driver circuit according to the present invention as well as with the at least one transimpedance converter circuit according to the present invention now represents a possibility to also optically transmit the TMDS signals provided by the data source connection interface without an additional external Power would be needed.
• TMDS encoded signals may have data rates in the range of several gigabits per second
• the optical transmission of such TMDS encoded signals over optical fibers allows the construction of inexpensive signal links that do not emit electromagnetic radiation which can transport high data rates with low attenuation from the data source to the data sink.
• the advantages caused by the present optical transmission are particularly significant for cable lengths of more than about three meters.
• the driver circuit according to the present invention is connected between the TMDS transmitter and the light-emitting element, it is particularly advantageously ensured that the DC component provided by the TMDS transmitter is used to supply power to the light-emitting element; By contrast, the alternating current component made available from the TMDS transmitter is used to modulate the current flow conducted by the light-emitting element.
• the DC component provided from the TMDS transmitter is converted into a modulated signal current for driving the light-emitting element by means of the driver circuit functioning like a DC-DC converter (DC-DC converter), resulting in a transfer of the means provided by the TMDS transmitter energy (power) to the light-emitting element.
• DC-DC converter DC-DC converter
• This transferred power results from the product of the flowing DC component and the voltage difference between the node voltage at the output of the TMDS transmitter and the voltage supply also available on the TMDS interface in the order of about five volts.
• the transimpedance converter circuit according to the invention is supplied via a DC voltage component applied to the differential wire pair.
• the present invention further relates to a cable connection for transmitting, in particular at least one DVI data connection and / or at least one HDMI data connection associated, at least partially, in particular at least periodically, TMDS-coded signals from at least one data source to at least one data sink, comprising at least a circuit arrangement according to the kind set forth above.
• At least one such active optical transmission cable is based on the fact that the circuit arrangement, that is to say the at least one driver circuit and / or the min.
• At least one transimpedance converter circuit can be realized very compactly, namely without an external power supply, so that the driver and / or the transimpedance converter can / can be installed in a commercially available, in particular conventional or regular, DVI plug and / or HDMI plug.
• the present invention relates to the use of at least one circuit arrangement according to the type set out above and / or a method as described above in the signal connection, in particular in at least one cable connection, for example in at least one active optical transmission cable, between at least one HDTV data source , for example, at least one Blu-ray player, and at least one HDTV data sink, for example at least one very high-resolution flat screen.
• FIG. 1A is a conceptual schematic representation of a first embodiment of the first part, namely the driver part of a circuit arrangement according to the invention, which operates according to the method according to the present invention;
• Fig. 1 B is a conceptual schematic representation of a second embodiment of the first part, namely the driver part of a circuit arrangement according to the invention, which operates according to the method according to the present invention;
• FIG. 2A is a conceptual schematic representation of a first embodiment of the second part, namely the transimpedance converter part of a circuit arrangement according to the present invention, which operates according to the method according to the present invention;
• 2B is a conceptual schematic representation of a second embodiment of the second part, namely the transimpedance converter part of a circuit arrangement according to the present invention, which operates according to the method according to the present invention;
• FIG. 3 in conceptual-schematic representation of an example of a circuit arrangement of the prior art.
• FIGS. 1A to 3 Identical or similar configurations, elements or features are provided with identical reference symbols in FIGS. 1A to 3.
• driver circuit S1 illustrated with reference to FIG. 1A or the driver circuit SV according to the present invention illustrated in FIG. 1B and FIG. 1A
• FIG. 2A or FIG. 2B illustrate the transimpedance converter circuit S2 'according to the present invention, by which the circuit arrangement 100 (see FIGS. 1A, 2A) or the circuit arrangement 100' (FIG. see Fig. 1B, 2B) according to the present invention (in the present invention, it is possible to realize and operate the driver circuit S1, SV and the transimpedance converter circuit S2, S2 'independently of each other) basically possible to realize a cable-based connection to and operate, which requires no further electrical supply - except the already existing at the electrical contacts anyway electrical supply - and therefore to insert seamlessly into at least one DVI and / or HDMI transmission channel of an active optical transmission cable, without the existing connection interface IQ the data source as well as the existing connection interface IS of the data sink to have to modify or these interfaces IQ, IS outside the for this
• Interfaces IQ IS allowed to operate specifications.
• all signals used for image data transmission of a DVI and / or HDMI connection are transmitted in this way via optical channels from the DVI / HDMI source to the DVI / HDMI sink.
• FIG. 1 A shown first embodiment of the first part, namely the driver part S1 of a circuit arrangement 100 according to the present invention
• FIG. 1A or FIG. 1B show the basic structure of the driver S1 or SV for connection to the connection interface IQ of the data source.
• This connection interface IQ of the data source provides a
• Voltage supply V DVI / HDMI in the order of about five volts available, which may be loaded with a maximum of about 55 milliamps.
• This supply voltage V DVI / HDMI is supplied to the driver S1 or SV, which - according to FIG. 1A, is a voltage-limiting element LT 1 or, for example, a cross-controller or shunt regulator (so-called shunt regulator).
• FIG. 1 B has a voltage regulator REG 1 .
• the driver S1 and SV a for example, as a voltage formed and / or, for example acting as a DC-DC converter boosting circuit DB 1, Termin michswider- stands R T1 and R T2, a storage capacitor C 1, an input amplifier circuit DRV 1 and a switching transistor T 1 on.
• the second exemplary embodiment of the driver SV according to FIG. 1B has a switching transistor T2 operating as a source follower.
• the term "light” or “light emitting” is understood to mean not only the region of the electromagnetic radiation visible to the eye, which extends in a wavelength range from about 380 nanometers to about 780 nanometers, which corresponds to a frequency of about 789 terahertz corresponds to about 385 terahertz; Rather, the term “light” or “light emitting” is understood to mean the entire electromagnetic spectrum or frequency spectrum which is invisible to the human eye, in particular the l [nfra] R [ot] region (wavelength range up to about 2,000 nanometers or frequency range - rich down to about 150 terahertz), for example, a wavelength of
• the light-emitting element LD 1 couples the light L TMDS charged with the data signal into an optical fiber F 1 .
• a defined potential difference or voltage difference V LT1 which represents the input voltage for the voltage increase circuit DB 1 , is generated via the voltage-limiting element LT 1 ;
• a defined termination signal is applied via the voltage regulation element REG 1 .
• Voltage V term which represents the input voltage for the booster circuit DB 1 .
• this termination voltage V term (compare the second exemplary embodiment of the driver SV according to FIG. 1B) is brought to a voltage amount necessary for operating the light-emitting element LD 1 ;
• this potential or voltage difference V LT1 or this termination voltage V Term can be brought about by the factor 1, 5 by means of the voltage increase circuit DB 1 to a voltage of about 2.5 volts necessary for operating the light-emitting element LD 1 .
• the input terminal V 1n of the booster circuit DB 1 becomes
• the output terminal V out of the booster circuit DB 1 is connected to the back-up capacitor C 1 and to the output terminal of the light-emitting element LD 1 ;
• the reference terminal Ref of the voltage increase circuit DB 1 is at supply voltage V DV I / HDMII accordingly, the driver circuit S1 or SV uses the supply voltage V DV I / H DMI as the reference point.
• the driver circuit S1 or SV Via the driver circuit S1 or SV it is ensured that the DC component provided from a TMDS transmitter TM is used to supply power to the light-emitting element LD 1 .
• the input amplifier DRV 1 and the switching transistor T 1 By means of the input amplifier DRV 1 and the switching transistor T 1 , the current flow through the light-emitting element LD 1 is modulated in dependence on the differential output signal of the TMDS transmitter TM.
• the gate or base of the switching transistor T 1 is connected to the output terminal of the amplifier DRV 1 .
• the drain or the collector of the switching transistor T 1 is assigned to the supply voltage V DV I / H DMI; In particular, the drain or the collector of the switching transistor T 1 is substantially at supply voltage VD W HDMI-
• the source or the emitter of the switching transistor T 1 is connected to the input terminal of the light-emitting element LD 1 .
• the transistor T2 operating as a source follower (so-called source follower) that the light-emitting element LD 1 is always at the same time during the phases in which the first transistor T 1 is switched off a minimum voltage is applied.
• Elements LD 1 can be achieved, whereby even high signal frequencies by the light emitting element LD 1 are transferable.
• the gate or base of the second switching transistor T 2 is associated with the supply voltage V DV I / H DMI;
• the gate or the base of the second switching transistor T 2 can also be selected to be slightly different from the supply voltage V DV I / H DMI in order to achieve an optimization to the most favorable operating point of the light-emitting element LD 1 .
• the drain or the collector of the second switching transistor T 2 is assigned to the supply voltage V DV I / H DMI; In particular, the drain or the collector of the second switching transistor T 2 is substantially at supply voltage V DV I / H DMI-
• the source or the emitter of the second switching transistor T 2 is connected to the source or the emitter of the switching transistor T 1 and to the input terminal of the light-emitting Elements LD 1 connected.
• the TMDS transmitter TM For the correct adjustment of the operating point of the output stage of the TMDS transmitter TM, whose differential output is preceded by two mirror-inverted transistors TS, TS ', the TMDS transmitter TM
• the difference of potential or voltage difference V LT1 and power supply V DV I / H DMI - In the second embodiment of the driver circuit SV shown in FIG. 1 B, the output voltage V term of the voltage regulator REG 1 on the purpose of at least partial termination of the differential connection line AD, AD 'provided termination resistors R T1 , R T2 provided.
• the first termination resistor R T1 is connected between the input terminal of the voltage-limiting element LT 1 (see first exemplary embodiment of the driver S1 according to FIG. 1A) and the voltage regulator REG 1 (compare second exemplary embodiment of the driver SV according to FIG Input terminal of the amplifier circuit DRV 1 connected; the second termination resistor R T2 is connected between the input terminal of the voltage-limiting element LT 1 (compare the first exemplary embodiment of the driver S1 according to FIG. 1A) and the voltage regulator REG 1 (compare second exemplary embodiment of the driver SV according to FIG a second input terminal of the amplifier circuit DRV 1 connected.
• FIGS. 2A and 2B show the basic structure of the transimpedance converter S2 or S2 'for connection to the connection interface IS of the data sink.
• This connection interface IS of the data sink has no explicit voltage supply which could provide the necessary energy to the transimpedance converter S2 or S2 '.
• the TMDS receiver RC of the data sink connective interface IS serves to correctly terminate the TMDS transmitter TM and the output stage of the TMDS transmitter TM via the differential wire pair AD, AD 'between the data source and the data sink in the case of an electrical connection between the data source and the data sink Data sink to provide the required operating voltage;
• transimpedance converter circuit S2 or S2 ' which has an amplifier TIA 1 and
• Resistors R 1 , R 2 , R 3 has.
• the first exemplary embodiment of the transimpedance converter circuit S2 according to FIG. 2A has coupling capacitors C 2 and C 3 , supporting capacitors C 4 and C 5 and silicon diodes D 1 and D 2 connected in series with one another,
• the second embodiment of the transimpedance converter circuit S2 ' accordinging to FIG. 2B has a pair of switching transistors T 3 , T 4 and a backup capacitor C 2 '.
• the TMDS receiver RC of the connection interface IS of the data sink provides via internal, parallel Ohmic termination resistors R ⁇ , R ⁇ 'at its differential input in the case of a galvanic connection between data source and data sink with up to about twelve milliamps per differential input loadable operating voltage AV ⁇ in the order of about 3.3 volts available.
• AV ⁇ becomes at the termination R ⁇ , R ⁇ 'in the TMDS receiver
• TM generates the input signal voltage required for the input amplifier EV.
• this voltage is smoothed via the capacitor C 5 .
• this voltage is made available to the amplifier TIA 1 as a supply voltage for the reverse voltage V PD of a photodiode PD 1 assigned to the transimpedance converter S2. Further, flows of the first embodiment of the transimpedance converter circuit S2 shown in FIG.
• the current from the output stage is used as the operating or supply power supp l ⁇ y of the amplifier TIA. 1
• the voltage across the series resistor R 3 on the two silicon diodes D 1 , D 2 out.
• the correct operating voltage V supp ⁇ y of about 1.4 volts for the Amplifier TIA 1 generated whose differential input is assigned to the light-absorbing element PD 1 .
• the first coupling capacitor C 2 is assigned to the first output of the amplifier TIA 1 ; the second coupling capacitor C 3 is assigned to the second output of the amplifier TIA 1 .
• the first switching transistor T 3 is assigned to the first output of the amplifier TIA 1 ; the second switching transistor T 4 is associated with the second output of the amplifier TIA 1 , which provides the opposite output to the first output of the amplifier TIA 1 signal of the differential output signal.
• the transimpedance converter circuit S2 'of FIG. 2B is the gate or base of the first switching transistor T 3 having the first output terminal of the amplifier
• the drain or the collector of the first switching transistor T 3 is assigned to the first (termination) resistor R 1 ; the source or the emitter of the first switching transistor T 3 is on the series resistor R 3 to operating voltage or supply voltage V supp ⁇ y for the amplifier TIA. 1
• the second embodiment of the transimpedance converter circuit S2 ' accordinging to FIG.
• the gate or the base of the second switching transistor T 4 is connected to the second output terminal of the amplifier TIA 1 ; the drain or collector of the second switching transistor T 4 is associated with the second (termination) resistor R 2 ; the source or the emitter of the second switching transistor T 4 is connected to the source or emitter of the first switching transistor T 3 and is connected to the operating voltage or supply voltage V supp I y for the amplifier TIA 1 via the series resistor R 3 .
• the current from the output stage is used as the operating or supply power supp l ⁇ y of the amplifier TIA. 1
• the electrical power required to operate the transimpedance converter circuit S2 or S2 ' is taken from the power resulting from the direct current component in the connection between the transimpedance converter circuit S2 or S2' and the TMDS receiver RC and from the DC component on the TMDS receiver RC ,
• the electrical power for operating the amplifier TIA 1 of the transimpedance converter circuit S2 or S2 ' is taken from that electrical power that is a product of direct current component in the connection between the transimpedance converter circuit S2 or S2' and the TMDS receiver RC and from the potential difference or Voltage difference between the node voltage at the output of the TMDS TM transmitter and also at the TMDS interface on the order of about three volts to
• AD first vein of the differential pair of wires AD, AD '
• EV amplifier circuit in particular input amplifier, of the receiver or receiver RC F 1 optical fiber, in particular glass fiber or plastic fiber, for example plastic fiber, between
• IQ of a data source associated connection interface especially DVI / HDMI
• the driver circuit S1 LT 1 voltage-limiting element, in particular cross-controller or shunt regulator or shunt regulator, the driver circuit S1
• R 1 first, in particular ohmic, resistance, for example, first termination resistor, the transimpedance converter circuit S2, S2 '
• R 2 second, in particular ohmic, resistance, for example, second termination resistor
• Transimpedance converter circuit S2, S2 'R 3 third, in particular ohmic, resistance, for example, series resistor, the transimpedance converter circuit S2, S2'
• RC receiver in particular TMDS receiver, or receiver, in particular TMDS receiver
• the driver circuit SV T 2 second switching transistor, in particular source follower or source follower, the driver circuit SV
• TM output current drivers in particular TMDS output current drivers, or transmitters, in particular TMDS transmitters
• VD V I / HDMI supply voltage in particular of about five volts
• V LT1 defined by voltage limiting element LT 1 potential difference or voltage difference
• V SUpp i y Operating voltage or supply voltage for amplifier TIA 1
• V term defined by voltage regulation element or voltage regulator REG 1 (s) termination potential or termination voltage

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• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Theoretical Computer Science (AREA)
• General Physics & Mathematics (AREA)
• Computer Networks & Wireless Communication (AREA)
• Computer Hardware Design (AREA)
• Dc Digital Transmission (AREA)
• Optical Communication System (AREA)
• Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
• Electronic Switches (AREA)
• Logic Circuits (AREA)
• Optical Couplings Of Light Guides (AREA)

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• 2009
  • 2009-10-09 WO PCT/EP2009/063131 patent/WO2010040816A2/de not_active Ceased
  • 2009-10-09 JP JP2011530492A patent/JP5556817B2/ja not_active Expired - Fee Related
  • 2009-10-09 EP EP09752761.8A patent/EP2359502B1/de active Active
• 2011
  • 2011-04-08 US US13/083,282 patent/US8824898B2/en active Active

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