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WO2014049686A1 - Hdmi device, communication system, and hot-plug control method - Google Patents

Hdmi device, communication system, and hot-plug control method Download PDF

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Publication number
WO2014049686A1
WO2014049686A1 PCT/JP2012/074555 JP2012074555W WO2014049686A1 WO 2014049686 A1 WO2014049686 A1 WO 2014049686A1 JP 2012074555 W JP2012074555 W JP 2012074555W WO 2014049686 A1 WO2014049686 A1 WO 2014049686A1
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WO
WIPO (PCT)
Prior art keywords
pin
hdmi
signal
hot plug
transistor
Prior art date
Application number
PCT/JP2012/074555
Other languages
French (fr)
Japanese (ja)
Inventor
和幸 小柳
Original Assignee
Ｎｅｃディスプレイソリューションズ株式会社
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 Ｎｅｃディスプレイソリューションズ株式会社 filed Critical Ｎｅｃディスプレイソリューションズ株式会社
Priority to PCT/JP2012/074555 priority Critical patent/WO2014049686A1/en
Priority to TW101136805A priority patent/TWI528800B/en
Priority to EP13842817.2A priority patent/EP2902871A4/en
Priority to PCT/JP2013/075682 priority patent/WO2014050807A1/en
Priority to CN201380050046.8A priority patent/CN104704445B/en
Priority to JP2014538487A priority patent/JP5943439B2/en
Priority to US14/429,342 priority patent/US10176140B2/en
Publication of WO2014049686A1 publication Critical patent/WO2014049686A1/en

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    • 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
    • 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
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
    • H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
    • H04N21/43635—HDMI
    • 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

Definitions

  • the present invention relates to an HDMI apparatus having an interface conforming to the HDMI (High-Definition Multimedia Interface) standard.
  • HDMI is a standard for a communication interface that transmits video / audio as a digital signal, and recently, various devices having an interface conforming to the HDMI standard have been provided.
  • the HDMI standard communication system includes a source device that sends out an HDMI signal and a sink device that receives the HDMI signal, and the source device and the sink device are connected via an HDMI cable (see Patent Document 1).
  • the source device is, for example, a Blu-ray disc player, a video camera, or a portable device.
  • the sink device is, for example, a monitor or projector such as an HD (High Definition) television.
  • FIG. 1 shows an example of an HDMI signal transmission / reception sequence.
  • the source device supplies a predetermined voltage (for example, + 5V) to the sink device (step S100), and the sink device receives the voltage supply and sends the hot plug detection signal to the source device. Transmit (step S101).
  • a predetermined voltage for example, + 5V
  • the source device recognizes that the sink device is connected to its own device based on the hot plug detection signal from the sink device.
  • the source device that has received the hot plug detection signal accesses EDID (Extended Display Identification Data) information in the sink device (step S102), and the sink device sends the EDID information held by itself to the source device (step S102).
  • EDID Extended Display Identification Data
  • the EDID information is a data set indicating information on functions and performance (specifically, format, resolution, etc.) supported by the sink device.
  • the source device Based on the EDID information acquired from the sink device, the source device recognizes the video / audio format and resolution that can be played back by the sink device, and converts the video / audio signal corresponding to the format / resolution to TMDS (Transition Minimized Differential Differential Signaling ) Is transmitted to the sink device by a transmission method called (step S104).
  • TMDS Transition Minimized Differential Differential Signaling
  • the sink device receives the TMDS signal from the source device (step S105).
  • a clock signal and a control signal are also supplied from the source device to the sink device.
  • the sink device performs processing such as reproduction of the TMDS signal based on the clock signal in accordance with the control signal.
  • Fig. 2 shows an example of the configuration of the sink device.
  • the sink device has an HDMI connector 101, a memory 102, and an HDMI receiver IC (Integrated Circuit) 103.
  • the memory 102 is a nonvolatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory), and holds EDID information.
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • the HDMI connector 101 is a 19-pin standard type connector.
  • the 19th pin is a pin for outputting a hot plug detection signal.
  • a voltage of +5 V is supplied to the 18th pin from the source device.
  • the 18th pin is connected to the 19th pin via a resistance element.
  • a voltage of +5 V is supplied to the 18th pin, a current flows through the resistance element, and the hot plug is connected to the 19th pin.
  • a detection signal (+ 5V signal) is output.
  • the 15th pin and the 16th pin are pins for reading the EDID information stored in the memory 102. These numbers 15 and 16 are each connected to the memory 102 and also to the HDMI receiver IC 103.
  • the TMDS signal, clock signal and control signal from the source device are received by some of the remaining pins.
  • the HDMI receiver IC 103 performs a TMDS signal reproduction process based on the clock signal in accordance with the control signal.
  • Fig. 3 shows another configuration example of the sink device.
  • the sink device shown in FIG. 3 is configured such that the memory 102 is removed from the sink device shown in FIG. 2 and the HDMI receiver IC 103 holds the EDID information 104.
  • the HDMI receiver IC 103 accepts access from the source device via the 15th and 16th pins, and outputs the EDID information 104 held by itself from the 15th and 16th pins. To do. Other operations are the same as those shown in FIG.
  • the + 5V hot plug detection signal is supplied when a + 5V voltage is supplied to the 18th pin, regardless of whether or not the own device is powered on. Is output from the 19th pin.
  • both of the sink devices shown in FIGS. 2 and 3 output a + 5V hot plug detection signal to the source device when a + 5V voltage is supplied from the source device even when the power is OFF. It is configured.
  • the source device does not have a function of detecting whether or not the sink device connected to the source device is turned on. For this reason, the sink device shown in FIGS. 2 and 3 has the following problems when connected to the source device in the power-off state.
  • the power OFF state is not a standby state (so-called standby state) but a state where the sink device is not connected to a commercial AC power source.
  • the source device receives the + 5V hot plug detection signal from the sink device in the power-off state, and reads the EDID information from the memory 102 in the sink device.
  • the source device shown in FIG. 2 since the EDID information is stored in the memory 102 which is a non-volatile memory, the source device can read the EDID information from the memory 102 even when the sink device is not turned on. it can.
  • the source device When the source device acquires EDID information from the sink device in the power-off state, the source device supplies the TMDS signal to the sink device in the power-off state.
  • the TMDS signal When the TMDS signal is supplied to the sink device in the power-off state, a current leaks to the circuit of the sink device, and as a result, the sink device may malfunction.
  • the HDMI receiver IC 103 normally has a malfunction prevention function.
  • the malfunction due to the leakage current does not occur due to the malfunction prevention function.
  • the malfunction prevention function does not work, and malfunction due to leakage current becomes serious.
  • the source device receives the + 5V hot plug detection signal from the sink device in the power-off state, and accesses the EDID information 104 in the sink device.
  • the source device since the EDID information 104 is held in the HDMI receiver IC 103, the source device cannot access the HDMI receiver IC 103 when the power of the sink device is not turned on. Information 104 cannot be acquired.
  • the source device cannot acquire the EDID information, the source device cannot recognize the function and performance (format and resolution) of the sink device, so the TMDS signal is not supplied to the sink device.
  • the source device cannot acquire the EDID information after receiving the + 5V hot plug detection signal
  • the TMDS signal is not supplied to the sink device.
  • the video cannot be displayed on the sink device.
  • the source device and the sink device are connected via an HDMI cable and the source device is turned on and then the sink device is turned on, the source device is connected to the sink device as described above.
  • the EDID information cannot be acquired, and the video cannot be displayed on the sink device.
  • An object of the present invention is to provide an HDMI device, a communication system, and a hot plug control method that can solve the above-described problems such as malfunction and failure to display an image.
  • a connector portion connected to an external device via a communication cable including a first pin to which a predetermined voltage is supplied from the external device, and a hot plug indicating presence / absence of connection to the external device
  • An HDMI device comprising at least a second pin for outputting a detection signal, A control unit that outputs a first signal indicating that the HDMI device is powered;
  • an HDMI device including a circuit that outputs a low level or a ground potential to the second pin when the first signal is not output.
  • a sink device comprising the above HDMI device; A source device connected to the sink device via a communication cable, Provided is a communication system in which the source device supplies a predetermined voltage to the sink device and recognizes that the sink device is connected to the own device when receiving a hot plug detection signal of the predetermined voltage from the sink device Is done.
  • a connector portion connected to an external device via a communication cable including a first pin to which a predetermined voltage is supplied from the external device, and a hot plug indicating presence / absence of connection to the external device
  • FIG. 5 is a schematic diagram for explaining an operation when the HDMI apparatus shown in FIG. 4 is powered off.
  • FIG. 5 is a schematic diagram for explaining an operation when the HDMI apparatus shown in FIG. 4 is powered on.
  • FIG. 5 is a schematic diagram for explaining an operation when the HDMI apparatus shown in FIG. 4 is powered on.
  • It is a block diagram which shows the structure of the HDMI apparatus which is the 2nd Embodiment of this invention.
  • HDMI connector 12 Memory 13 HDMI receiver IC 14 switch circuit 15 to 17 resistance element 18 n-type MOSFET 19 transistor
  • FIG. 4 is a block diagram showing a configuration of the HDMI apparatus according to the first embodiment of the present invention.
  • the HDMI device shown in FIG. 4 is a sink device such as a monitor or projector such as an HD (High Definition) television, and its main part includes an HDMI connector 11, a memory 12, an HDMI receiver IC 13, and a switch circuit 14.
  • the HDMI connector 11 and the memory 12 are the same as the HDMI connector 101 and the memory 102 shown in FIG.
  • a connector other than the standard type, for example, a 29-pin connector may be used.
  • the switch circuit 14 When the control signal is at the first level (high level), the switch circuit 14 outputs the + 5V voltage signal supplied to the 18th pin from the 19th pin as a hot plug detection signal. Is at the second level (low level or ground potential), a signal having a voltage (low level or ground potential) lower than +5 V is output from the 19th pin as a hot plug detection signal.
  • the switch circuit 14 includes resistance elements 15 to 17, an n-type MOSFET 18 and a transistor 19.
  • the transistor 19 is an NPN transistor, and the emitter is grounded.
  • One end of the resistance element 15 is connected to one end of the resistance element 16 and to the 18th pin of the HDMI connector 11.
  • the other end of the resistance element 15 is connected to the drain of the n-type MOSFET 18 and to the 19th pin of the HDMI connector 11.
  • An NPN transistor can be used instead of the n-type MOSFET, but the + 5V voltage signal supplied from the 18th pin has a limitation on the current capacity, so use an n-type MOSFET with less current consumption. Is more convenient.
  • the other end of the resistance element 16 is connected to the gate of the n-type MOSFET 18 and to the collector of the transistor 19.
  • the source of the n-type MOSFET 18 is grounded.
  • the base of the transistor 19 is connected to the control signal output terminal of the HDMI receiver IC 13 via the resistance element 17.
  • the resistance value of the resistance element 15 is 1 k ⁇ , which is a value according to the HDMI standard.
  • the resistance values of the resistance elements 16 and 17 are both about 10 k ⁇ .
  • the HDMI receiver IC 13 outputs a high level control signal from the control signal output terminal while the HDMI device is powered on. Except for the above period (when the HDMI device is not powered on), the voltage at the control signal output terminal is at a low level (ground potential).
  • This configuration can be realized by using a switching element such as a MOSFET.
  • the period during which the power is on refers to a period during which the sink device is connected to a commercial AC power source regardless of whether the sink device is performing normal operation or in a standby state.
  • FIG. 5 schematically shows an operation when a + 5V voltage is supplied to the 18th pin of the HDMI connector 11 in the HDMI device in the power OFF state.
  • the HDMI receiver IC 13 is not activated, so that a low-level control signal is supplied to the base of the transistor 19 via the resistance element 17. As a result, the transistor 19 is turned off.
  • the voltage of +5 V is supplied to the 18th pin of the HDMI connector 11 when the transistor 19 is in the OFF state, the voltage of +5 V is supplied to the gate of the n-type MOSFET 18. Since the threshold voltage of the n-type MOSFET 18 is smaller than + 5V, the n-type MOSFET 18 is turned on.
  • the hot plug detection signal output from No. 19 becomes low level.
  • the source device When the hot plug detection signal is low level, the source device does not recognize the HDMI device.
  • FIG. 6 schematically shows an operation in the case where a voltage of +5 V is supplied to the 18th pin of the HDMI connector 11 in the HDMI device in the power-on state.
  • the HDMI receiver IC 13 supplies a high-level control signal to the base of the transistor 19 via the resistance element 17. As a result, the transistor 19 is turned on.
  • the gate of the n-type MOSFET 18 is grounded through the transistor 19. As a result, the voltage level of the gate of the n-type MOSFET 18 becomes lower than the threshold voltage (low level), and the n-type MOSFET 18 is turned off.
  • the 18th pin and the 19th pin are simply connected via the resistance element 15, and a + 5V hot plug detection signal is output from the 19th pin.
  • the source device When the source device receives the + 5V hot plug detection signal, the source device recognizes that the HDMI device is connected to the source device. Then, processing based on the procedure of steps S102 to S105 shown in FIG. 1 is performed between the source device and the HDMI device.
  • the HDMI device of the present embodiment even when a voltage of +5 V is supplied to the 18th pin of the HDMI connector 11 when connected to the source device with the power off, it is output from the 19th pin.
  • the level of the hot plug detection signal is low.
  • the source device does not recognize the connection of the HDMI device in the power OFF state to the own device. Therefore, the TMDS signal is not supplied from the source device to the HDMI device in the power-off state, and the HDMI device does not malfunction due to a leakage current generated by supplying the TMDS signal.
  • FIG. 7 is a block diagram showing a configuration of an HDMI apparatus according to the second embodiment of the present invention.
  • the HDMI device of the present embodiment is configured such that the memory 12 is removed from the HDMI device shown in FIG. 4 and the HDMI receiver IC 13 holds the EDID information 13a.
  • the HDMI receiver IC 13 accepts access from the source device via the 15th and 16th pins of the HDMI connector 11, and the EDID information 13a held by itself is stored in the 15th and 16th. Output from the pin. Other operations are the same as those in the first embodiment.
  • the HDMI device of this embodiment when connected to the source device in a power-off state, even if a voltage of +5 V is supplied to the 18th pin of the HDMI connector 11, 19 The level of the hot plug detection signal output from the pin No. is low. For this reason, the source device does not recognize the connection of the HDMI device in the power OFF state to the own device. Therefore, the source device does not access the HDMI device in the power-off state in order to acquire the EDID information.
  • a hot plug detection signal of +5 V is output from the 19th pin.
  • the source device recognizes the connection of the HDMI device to the device itself, acquires EDID information from the HDMI device, and supplies the TMDS signal to the HDMI device.
  • the TMDS signal is supplied from the source device to the HDMI device. . Therefore, the video based on the TMDS signal is displayed on the HDMI device.
  • HDMI device of each embodiment described above is an example of the present invention, and changes that can be understood by those skilled in the art may be applied to the configuration and operation thereof without departing from the spirit of the invention.
  • a control unit other than the HDMI receiver IC may supply a control signal to the switch circuit 14.
  • the control unit may be, for example, a control circuit that controls the operation of the entire sink device.
  • the switch circuit 14 is not limited to the illustrated one, and when the control signal is at the first level (high level), the + 5V supplied to the first pin (for example, the 18th pin). Is output from the second pin (for example, the 19th pin) as a hot plug detection signal, and when the control signal is at the second level (low level), a voltage lower than +5 V (low level or ground potential) As long as the signal (2) can be output from the second pin as a hot plug detection signal, any configuration may be used.
  • a mechanical switch such as a relay may be used instead of a semiconductor switch such as a MOSFET or a transistor. At this time, if a latch relay is used, power consumption can be reduced to zero, which is convenient.

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

This HDMI device is provided with: a connector (11) connected to an external device via a communication cable; a controller (13) which, when a power source of the HDMI device is on, outputs a first signal indicating that the power source of the HDMI device is on; and a circuit (14) which, in cases when the first signal is not outputted, outputs a low-level or ground potential to a second pin. The connector (11) is provided with at least: a first pin to which a prescribed voltage is supplied from the external device; and the second pin which outputs a hot-plug detection signal indicating whether or not a connection to the external device has been established.

Description

ＨＤＭＩ装置、通信システムおよびホットプラグ制御方法HDMI device, communication system, and hot plug control method
　本発明は、ＨＤＭＩ（High-Definition Multimedia Interface）規格に準じたインタフェースを備えたＨＤＭＩ装置に関する。 The present invention relates to an HDMI apparatus having an interface conforming to the HDMI (High-Definition Multimedia Interface) standard.
　ＨＤＭＩは、映像／音声をデジタル信号で伝送する通信インタフェースの標準規格であり、最近では、このＨＤＭＩ規格に準じたインタフェースを備えた様々な機器が提供されている。 HDMI is a standard for a communication interface that transmits video / audio as a digital signal, and recently, various devices having an interface conforming to the HDMI standard have been provided.
　ＨＤＭＩ規格の通信システムは、ＨＤＭＩ信号を送り出すソース機器と、ＨＤＭＩ信号を受け取るシンク機器とからなり、ソース機器とシンク機器がＨＤＭＩケーブルを介して接続される（特許文献１参照）。 The HDMI standard communication system includes a source device that sends out an HDMI signal and a sink device that receives the HDMI signal, and the source device and the sink device are connected via an HDMI cable (see Patent Document 1).
　ソース機器は、例えば、ブルーレイディスクプレイヤー、ビデオカメラ、携帯型デバイスなどである。シンク機器は、例えば、ＨＤ（High Definition）テレビ等のモニタやプロジェクタなどである。 The source device is, for example, a Blu-ray disc player, a video camera, or a portable device. The sink device is, for example, a monitor or projector such as an HD (High Definition) television.
　上記通信システムでは、ソース機器とシンク機器をＨＤＭＩケーブルで接続すると、ソース機器とシンク機器の間でＨＤＭＩ信号を伝送するための処理が実行される。 In the above communication system, when the source device and the sink device are connected by an HDMI cable, processing for transmitting an HDMI signal between the source device and the sink device is executed.
　図１に、ＨＤＭＩ信号送受信シーケンスの一例を示す。 FIG. 1 shows an example of an HDMI signal transmission / reception sequence.
　図１を参照すると、まず、ソース機器が、所定の電圧（例えば、＋５Ｖ）をシンク機器に供給し（ステップＳ１００）、シンク機器が、その電圧供給を受けて、ホットプラグ検出信号をソース機器に送信する（ステップＳ１０１）。 Referring to FIG. 1, first, the source device supplies a predetermined voltage (for example, + 5V) to the sink device (step S100), and the sink device receives the voltage supply and sends the hot plug detection signal to the source device. Transmit (step S101).
　ソース機器は、シンク機器からのホットプラグ検出信号に基づいて、自機器にシンク機器が接続されたことを認識する。 The source device recognizes that the sink device is connected to its own device based on the hot plug detection signal from the sink device.
　ホットプラグ検出信号を受信したソース機器は、シンク機器内のＥＤＩＤ（Extended Display Identification Data）情報にアクセスし（ステップＳ１０２）、シンク機器は、自身が保持しているＥＤＩＤ情報をソース機器に送る（ステップＳ１０３）。ここで、ＥＤＩＤ情報は、シンク機器が対応する機能や性能（具体的には、フォーマットや解像度など）に関する情報を示すデータセットである。 The source device that has received the hot plug detection signal accesses EDID (Extended Display Identification Data) information in the sink device (step S102), and the sink device sends the EDID information held by itself to the source device (step S102). S103). Here, the EDID information is a data set indicating information on functions and performance (specifically, format, resolution, etc.) supported by the sink device.
　ソース機器は、シンク機器から取得したＥＤＩＤ情報に基づいて、シンク機器で再生可能な映像／音声のフォーマットや解像度を認識し、そのフォーマットや解像度に対応する映像／音声信号をＴＭＤＳ（Transition Minimized Differential Signaling）と呼ばれる伝送方式でシンク機器へ送信する（ステップＳ１０４）。 Based on the EDID information acquired from the sink device, the source device recognizes the video / audio format and resolution that can be played back by the sink device, and converts the video / audio signal corresponding to the format / resolution to TMDS (Transition Minimized Differential Differential Signaling ) Is transmitted to the sink device by a transmission method called (step S104).
　シンク機器は、ソース機器からＴＭＤＳ信号を受信する（ステップＳ１０５）。ＴＭＤＳ信号の他、クロック信号や制御信号も、ソース機器からシンク機器へ供給される。シンク機器は、制御信号に従って、クロック信号に基づくＴＭＤＳ信号の再生等の処理を行う。 The sink device receives the TMDS signal from the source device (step S105). In addition to the TMDS signal, a clock signal and a control signal are also supplied from the source device to the sink device. The sink device performs processing such as reproduction of the TMDS signal based on the clock signal in accordance with the control signal.
　図２に、シンク機器の一構成例を示す。 Fig. 2 shows an example of the configuration of the sink device.
　図２を参照すると、シンク機器は、ＨＤＭＩコネクタ１０１、メモリ１０２およびＨＤＭＩレシーバＩＣ（Integrated circuit）１０３を有する。 Referring to FIG. 2, the sink device has an HDMI connector 101, a memory 102, and an HDMI receiver IC (Integrated Circuit) 103.
　メモリ１０２は、ＥＥＰＲＯＭ（Electrically Erasable Programmable Read-Only Memory）等の不揮発性メモリであって、ＥＤＩＤ情報を保持している。 The memory 102 is a nonvolatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory), and holds EDID information.
　ＨＤＭＩコネクタ１０１は、１９ピンの標準タイプのコネクタである。１９番のピンはホットプラグ検出信号を出力するためのピンである。ソース機器から＋５Ｖの電圧が１８番のピンに供給される。 The HDMI connector 101 is a 19-pin standard type connector. The 19th pin is a pin for outputting a hot plug detection signal. A voltage of +5 V is supplied to the 18th pin from the source device.
　１８番のピンは、抵抗素子を介して１９番のピンに接続されており、＋５Ｖの電圧が１８番のピンに供給されると、電流が抵抗素子に流れ、１９番のピンより、ホットプラグ検出信号（＋５Ｖの信号）が出力される。 The 18th pin is connected to the 19th pin via a resistance element. When a voltage of +5 V is supplied to the 18th pin, a current flows through the resistance element, and the hot plug is connected to the 19th pin. A detection signal (+ 5V signal) is output.
　１５番のピンおよび１６番のピンは、メモリ１０２に格納されているＥＤＩＤ情報を読み出すためのピンである。これら１５番および１６番はそれぞれ、メモリ１０２に接続されるとともに、ＨＤＭＩレシーバＩＣ１０３に接続されている。 The 15th pin and the 16th pin are pins for reading the EDID information stored in the memory 102. These numbers 15 and 16 are each connected to the memory 102 and also to the HDMI receiver IC 103.
　残りのピンの一部により、ソース機器からのＴＭＤＳ信号、クロック信号および制御信号が受信される。ＨＤＭＩレシーバＩＣ１０３は、制御信号に従って、クロック信号に基づくＴＭＤＳ信号の再生処理を行う。 The TMDS signal, clock signal and control signal from the source device are received by some of the remaining pins. The HDMI receiver IC 103 performs a TMDS signal reproduction process based on the clock signal in accordance with the control signal.
　図３に、シンク機器の別の構成例を示す。 Fig. 3 shows another configuration example of the sink device.
　図３に示すシンク機器は、図２に示したシンク機器からメモリ１０２を取り除き、ＨＤＭＩレシーバＩＣ１０３が、ＥＤＩＤ情報１０４を保持するように構成したものである。 The sink device shown in FIG. 3 is configured such that the memory 102 is removed from the sink device shown in FIG. 2 and the HDMI receiver IC 103 holds the EDID information 104.
　図３に示すシンク機器では、ＨＤＭＩレシーバＩＣ１０３は、１５番および１６番のピンを介してソース機器からのアクセスを受け付け、自身が保持しているＥＤＩＤ情報１０４を１５番および１６番のピンより出力する。この他の動作は、図２に示したものと同じである。 In the sink device shown in FIG. 3, the HDMI receiver IC 103 accepts access from the source device via the 15th and 16th pins, and outputs the EDID information 104 held by itself from the 15th and 16th pins. To do. Other operations are the same as those shown in FIG.
　上記の図２および図３に示したシンク機器はいずれも、自機器が電源ＯＮの状態か否かに関係なく、＋５Ｖの電圧が１８番のピンに供給されると、＋５Ｖのホットプラグ検出信号を１９番のピンより出力する。 2 and FIG. 3, the + 5V hot plug detection signal is supplied when a + 5V voltage is supplied to the 18th pin, regardless of whether or not the own device is powered on. Is output from the 19th pin.
特開２０１１－２３９３８６号公報JP 2011-239386 A
　上述したように、図２および図３に示したシンク機器はいずれも、電源ＯＦＦ状態でも、ソース機器から＋５Ｖの電圧が供給されると、＋５Ｖのホットプラグ検出信号をソース機器に出力するように構成されている。一方、ソース機器は、自機器に接続されたシンク機器の電源が入っているか否かを検出する機能を有していない。このため、図２および図３に示したシンク機器では、電源ＯＦＦ状態でソース機器と接続された場合に、以下のような問題が生じる。なお、ここで電源ＯＦＦ状態とは、待機状態（いわゆるスタンバイ状態）ではなく、シンク機器が商用交流電源に接続されていない状態を指す。 As described above, both of the sink devices shown in FIGS. 2 and 3 output a + 5V hot plug detection signal to the source device when a + 5V voltage is supplied from the source device even when the power is OFF. It is configured. On the other hand, the source device does not have a function of detecting whether or not the sink device connected to the source device is turned on. For this reason, the sink device shown in FIGS. 2 and 3 has the following problems when connected to the source device in the power-off state. Here, the power OFF state is not a standby state (so-called standby state) but a state where the sink device is not connected to a commercial AC power source.
　まず、図２に示したシンク機器を電源ＯＦＦの状態でソース機器に接続した場合に生じる問題について説明する。 First, the problem that occurs when the sink device shown in FIG. 2 is connected to the source device with the power off is described.
　ソース機器は、電源ＯＦＦ状態のシンク機器から＋５Ｖのホットプラグ検出信号を受信し、シンク機器内のメモリ１０２からＥＤＩＤ情報を読み取る。図２に示したシンク機器では、ＥＤＩＤ情報は不揮発性メモリであるメモリ１０２に格納されているので、シンク機器の電源が入っていなくても、ソース機器は、メモリ１０２からＥＤＩＤ情報を読み取ることができる。 The source device receives the + 5V hot plug detection signal from the sink device in the power-off state, and reads the EDID information from the memory 102 in the sink device. In the sink device shown in FIG. 2, since the EDID information is stored in the memory 102 which is a non-volatile memory, the source device can read the EDID information from the memory 102 even when the sink device is not turned on. it can.
　ソース機器は、電源ＯＦＦ状態のシンク機器からＥＤＩＤ情報を取得すると、ＴＭＤＳ信号を電源ＯＦＦ状態のシンク機器に供給する。ＴＭＤＳ信号が電源ＯＦＦ状態のシンク機器に供給されることで、シンク機器の回路に電流がリークし、その結果、シンク機器が誤作動する場合がある。 When the source device acquires EDID information from the sink device in the power-off state, the source device supplies the TMDS signal to the sink device in the power-off state. When the TMDS signal is supplied to the sink device in the power-off state, a current leaks to the circuit of the sink device, and as a result, the sink device may malfunction.
　なお、通常、ＨＤＭＩレシーバＩＣ１０３は、誤作動防止機能を備えており、シンク機器の電源が入っている場合は、この誤作動防止機能により、上記のリーク電流による誤作動は生じない。しかしながら、上記のようにシンク機器に電源が入っていない場合には、誤作動防止機能が働かないため、リーク電流による誤作動は深刻なものとなる。 Note that the HDMI receiver IC 103 normally has a malfunction prevention function. When the sink device is powered on, the malfunction due to the leakage current does not occur due to the malfunction prevention function. However, when the sink device is not powered as described above, the malfunction prevention function does not work, and malfunction due to leakage current becomes serious.
　次に、図３に示したシンク機器を電源ＯＦＦの状態でソース機器に接続した場合に生じる問題について説明する。 Next, a problem that occurs when the sink device shown in FIG. 3 is connected to the source device with the power off is described.
　ソース機器は、電源ＯＦＦ状態のシンク機器から＋５Ｖのホットプラグ検出信号を受信し、シンク機器内のＥＤＩＤ情報１０４へアクセスする。図３に示したシンク機器では、ＥＤＩＤ情報１０４はＨＤＭＩレシーバＩＣ１０３に保持されているので、シンク機器の電源が入っていない場合は、ソース機器は、ＨＤＭＩレシーバＩＣ１０３へアクセスすることができず、ＥＤＩＤ情報１０４を取得することができない。 The source device receives the + 5V hot plug detection signal from the sink device in the power-off state, and accesses the EDID information 104 in the sink device. In the sink device shown in FIG. 3, since the EDID information 104 is held in the HDMI receiver IC 103, the source device cannot access the HDMI receiver IC 103 when the power of the sink device is not turned on. Information 104 cannot be acquired.
　ソース機器は、ＥＤＩＤ情報を取得することができなかった場合は、シンク機器の機能や性能（フォーマットや解像度）を認識することができないため、シンク機器へのＴＭＤＳ信号の供給は行わない。 If the source device cannot acquire the EDID information, the source device cannot recognize the function and performance (format and resolution) of the sink device, so the TMDS signal is not supplied to the sink device.
　このように、ソース機器は、＋５Ｖのホットプラグ検出信号を受信した後に、ＥＤＩＤ情報を取得できなかった場合には、シンク機器へのＴＭＤＳ信号の供給は行わないため、シンク機器の電源を入れても、シンク機器にて映像を表示できない。 As described above, when the source device cannot acquire the EDID information after receiving the + 5V hot plug detection signal, the TMDS signal is not supplied to the sink device. However, the video cannot be displayed on the sink device.
　例えば、ソース機器とシンク機器がＨＤＭＩケーブルを介して接続された状態で、ソース機器の電源を入れた後、シンク機器の電源を入れた場合には、上記のように、ソース機器がシンク機器のＥＤＩＤ情報を取得することがでず、シンク機器にて映像を表示できない場合がある。 For example, when the source device and the sink device are connected via an HDMI cable and the source device is turned on and then the sink device is turned on, the source device is connected to the sink device as described above. In some cases, the EDID information cannot be acquired, and the video cannot be displayed on the sink device.
　本発明の目的は、上記の誤作動や映像を表示できないといった問題を解決することができる、ＨＤＭＩ装置、通信システムおよびホットプラグ制御方法を提供することにある。 An object of the present invention is to provide an HDMI device, a communication system, and a hot plug control method that can solve the above-described problems such as malfunction and failure to display an image.
　上記目的を達成するため、本発明の一態様によれば、
　外部装置と通信ケーブルを介して接続されるコネクタ部を有し、該コネクタ部は、前記外部装置から所定の電圧が供給される第１のピンと、前記外部装置への接続の有無を示すホットプラグ検出信号を出力する第２のピンとを少なくとも備える、ＨＤＭＩ装置であって、
　前記ＨＤＭＩ装置の電源が入っているときにはその旨を示す第１の信号を出力する制御部と、
　前記第１の信号が出力されていない場合には前記第２のピンにロウレベルまたは接地電位を出力する回路と、を有する、ＨＤＭＩ装置が提供される。 In order to achieve the above object, according to one aspect of the present invention,
A connector portion connected to an external device via a communication cable, the connector portion including a first pin to which a predetermined voltage is supplied from the external device, and a hot plug indicating presence / absence of connection to the external device An HDMI device comprising at least a second pin for outputting a detection signal,
A control unit that outputs a first signal indicating that the HDMI device is powered;
There is provided an HDMI device including a circuit that outputs a low level or a ground potential to the second pin when the first signal is not output.
　本発明の別の態様によれば、
　上記のＨＤＭＩ装置よりなるシンク機器と、
　前記シンク機器と通信ケーブルを介して接続されるソース機器と、を有し、
　前記ソース機器は、所定の電圧を前記シンク機器に供給し、前記シンク機器から前記所定の電圧のホットプラグ検出信号を受信すると、自機器に前記シンク機器が接続されたと認識する、通信システムが提供される。 According to another aspect of the invention,
A sink device comprising the above HDMI device;
A source device connected to the sink device via a communication cable,
Provided is a communication system in which the source device supplies a predetermined voltage to the sink device and recognizes that the sink device is connected to the own device when receiving a hot plug detection signal of the predetermined voltage from the sink device Is done.
　本発明の他の態様によれば、
　外部装置と通信ケーブルを介して接続されるコネクタ部を有し、該コネクタ部は、前記外部装置から所定の電圧が供給される第１のピンと、前記外部装置への接続の有無を示すホットプラグ検出信号を出力する第２のピンとを少なくとも備えるＨＤＭＩ装置にて行われるホットプラグ制御方法であって、
　前記ＨＤＭＩ装置の電源が入っている期間は、前記第１のピンに供給された前記所定の電圧の信号を前記ホットプラグ検出信号として前記第２のピンより出力し、
　前記期間以外は、前記第２のピンをロウレベルまたは接地電位とする、ホットプラグ制御方法が提供される。 According to another aspect of the invention,
A connector portion connected to an external device via a communication cable, the connector portion including a first pin to which a predetermined voltage is supplied from the external device, and a hot plug indicating presence / absence of connection to the external device A hot plug control method performed in an HDMI device including at least a second pin for outputting a detection signal,
While the HDMI device is powered on, the signal of the predetermined voltage supplied to the first pin is output from the second pin as the hot plug detection signal,
During the period other than the period, a hot plug control method is provided in which the second pin is set to a low level or a ground potential.
ＨＤＭＩ規格の通信システムにて行われるＨＤＭＩ信号送受信シーケンスの一例を説明するための図である。It is a figure for demonstrating an example of the HDMI signal transmission / reception sequence performed with the communication system of an HDMI specification. シンク機器の一構成例を示すブロック図である。It is a block diagram which shows the example of 1 structure of a sink device. シンク機器の別の構成例を示すブロック図である。It is a block diagram which shows another structural example of a sink device. 本発明の第１の実施形態であるＨＤＭＩ装置の構成を示すブロック図である。It is a block diagram which shows the structure of the HDMI apparatus which is the 1st Embodiment of this invention. 図４に示すＨＤＭＩ装置の電源ＯＦＦ時の動作を説明するための模式図である。FIG. 5 is a schematic diagram for explaining an operation when the HDMI apparatus shown in FIG. 4 is powered off. 図４に示すＨＤＭＩ装置の電源ＯＮ時の動作を説明するための模式図である。FIG. 5 is a schematic diagram for explaining an operation when the HDMI apparatus shown in FIG. 4 is powered on. 本発明の第２の実施形態であるＨＤＭＩ装置の構成を示すブロック図である。It is a block diagram which shows the structure of the HDMI apparatus which is the 2nd Embodiment of this invention.
　１１　ＨＤＭＩコネクタ
　１２　メモリ
　１３　ＨＤＭＩレシーバＩＣ
　１４　スイッチ回路
　１５～１７　抵抗素子
　１８　ｎ型ＭＯＳＦＥＴ
　１９　トランジスタ 11 HDMI connector 12 Memory 13 HDMI receiver IC
14 switch circuit 15 to 17 resistance element 18 n-type MOSFET
19 transistor
　次に、本発明の実施形態について図面を参照して説明する。 Next, an embodiment of the present invention will be described with reference to the drawings.
　（第１の実施形態）
　図４は、本発明の第１の実施形態であるＨＤＭＩ装置の構成を示すブロック図である。 (First embodiment)
FIG. 4 is a block diagram showing a configuration of the HDMI apparatus according to the first embodiment of the present invention.
　図４に示すＨＤＭＩ装置は、ＨＤ（High Definition）テレビ等のモニタやプロジェクタなどのシンク機器であって、その主要部は、ＨＤＭＩコネクタ１１、メモリ１２、ＨＤＭＩレシーバＩＣ１３およびスイッチ回路１４からなる。 The HDMI device shown in FIG. 4 is a sink device such as a monitor or projector such as an HD (High Definition) television, and its main part includes an HDMI connector 11, a memory 12, an HDMI receiver IC 13, and a switch circuit 14.
　ＨＤＭＩコネクタ１１およびメモリ１２は、図２に示したＨＤＭＩコネクタ１０１およびメモリ１０２と同じものである。なお、ＨＤＭＩコネクタ１１として、標準タイプ以外のコネクタ、例えば２９ピンのコネクタを用いてもよい。 The HDMI connector 11 and the memory 12 are the same as the HDMI connector 101 and the memory 102 shown in FIG. As the HDMI connector 11, a connector other than the standard type, for example, a 29-pin connector may be used.
　スイッチ回路１４は、制御信号が第１のレベル（ハイレベル）である場合は、１８番のピンに供給された＋５Ｖの電圧の信号をホットプラグ検出信号として１９番のピンより出力し、制御信号が第２のレベル（ロウレベルまたは接地電位）である場合には、＋５Ｖより低い電圧（ロウレベルまたは接地電位）の信号をホットプラグ検出信号として１９番のピンより出力する。 When the control signal is at the first level (high level), the switch circuit 14 outputs the + 5V voltage signal supplied to the 18th pin from the 19th pin as a hot plug detection signal. Is at the second level (low level or ground potential), a signal having a voltage (low level or ground potential) lower than +5 V is output from the 19th pin as a hot plug detection signal.
　具体的には、スイッチ回路１４は、抵抗素子１５～１７、ｎ型ＭＯＳＦＥＴ１８およびトランジスタ１９を有する。 Specifically, the switch circuit 14 includes resistance elements 15 to 17, an n-type MOSFET 18 and a transistor 19.
　トランジスタ１９は、ＮＰＮトランジスタであって、エミッタが接地されている。 The transistor 19 is an NPN transistor, and the emitter is grounded.
　抵抗素子１５の一端は、抵抗素子１６の一端に接続されるとともに、ＨＤＭＩコネクタ１１の１８番のピンに接続されている。抵抗素子１５の他端は、ｎ型ＭＯＳＦＥＴ１８のドレインに接続されるとともに、ＨＤＭＩコネクタ１１の１９番のピンに接続されている。ｎ型ＭＯＳＦＥＴの代わりにＮＰＮトランジスタとすることも可能だが、１８番ピンから供給される＋５Ｖの電圧の信号には、電流容量上の制限があるため、より消費電流の少ないｎ型ＭＯＳＦＥＴを使用する方が便宜である。 One end of the resistance element 15 is connected to one end of the resistance element 16 and to the 18th pin of the HDMI connector 11. The other end of the resistance element 15 is connected to the drain of the n-type MOSFET 18 and to the 19th pin of the HDMI connector 11. An NPN transistor can be used instead of the n-type MOSFET, but the + 5V voltage signal supplied from the 18th pin has a limitation on the current capacity, so use an n-type MOSFET with less current consumption. Is more convenient.
　抵抗素子１６の他端は、ｎ型ＭＯＳＦＥＴ１８のゲートに接続されるとともに、トランジスタ１９のコレクタに接続されている。ｎ型ＭＯＳＦＥＴ１８のソースは接地されている。 The other end of the resistance element 16 is connected to the gate of the n-type MOSFET 18 and to the collector of the transistor 19. The source of the n-type MOSFET 18 is grounded.
　トランジスタ１９のベースは、抵抗素子１７を介してＨＤＭＩレシーバＩＣ１３の制御信号出力端子に接続されている。 The base of the transistor 19 is connected to the control signal output terminal of the HDMI receiver IC 13 via the resistance element 17.
　抵抗素子１５の抵抗値は、１ｋΩであり、これはＨＤＭＩ規格に準じた値である。抵抗素子１６、１７の抵抗値はともに、１０ｋΩ程度である。 The resistance value of the resistance element 15 is 1 kΩ, which is a value according to the HDMI standard. The resistance values of the resistance elements 16 and 17 are both about 10 kΩ.
　ＨＤＭＩレシーバＩＣ１３は、ＨＤＭＩ装置の電源が入っている期間は、ハイレベルの制御信号を制御信号出力端子より出力する。上記期間以外（ＨＤＭＩ装置の電源が入っていない状態）は、制御信号出力端子の電圧は、ロウレベル（接地電位）とされる。この構成は、ＭＯＳＦＥＴ等のスイッチ素子を用いることで実現することができる。ここで電源が入っている期間とは、シンク機器が通常動作を行っているか、スタンバイ状態にあるかにかかわらず、シンク機器が商用交流電源に接続されている期間を指す。 The HDMI receiver IC 13 outputs a high level control signal from the control signal output terminal while the HDMI device is powered on. Except for the above period (when the HDMI device is not powered on), the voltage at the control signal output terminal is at a low level (ground potential). This configuration can be realized by using a switching element such as a MOSFET. Here, the period during which the power is on refers to a period during which the sink device is connected to a commercial AC power source regardless of whether the sink device is performing normal operation or in a standby state.
　次に、本実施形態のＨＤＭＩ装置の動作について説明する。 Next, the operation of the HDMI device of this embodiment will be described.
　図５に、電源ＯＦＦ状態のＨＤＭＩ装置において、＋５Ｖの電圧をＨＤＭＩコネクタ１１の１８番のピンに供給した場合の動作を模式的に示す。 FIG. 5 schematically shows an operation when a + 5V voltage is supplied to the 18th pin of the HDMI connector 11 in the HDMI device in the power OFF state.
　図５に示すように、電源ＯＦＦ状態のＨＤＭＩ装置では、ＨＤＭＩレシーバＩＣ１３は起動していないので、ロウレベルの制御信号が抵抗素子１７を介してトランジスタ１９のベースに供給される。これにより、トランジスタ１９はＯＦＦ状態になる。 As shown in FIG. 5, in the HDMI device in the power-off state, the HDMI receiver IC 13 is not activated, so that a low-level control signal is supplied to the base of the transistor 19 via the resistance element 17. As a result, the transistor 19 is turned off.
　トランジスタ１９がＯＦＦ状態のときに、＋５Ｖの電圧がＨＤＭＩコネクタ１１の１８番のピンに供給されると、ｎ型ＭＯＳＦＥＴ１８のゲートには、＋５Ｖの電圧が供給される。ｎ型ＭＯＳＦＥＴ１８の閾値電圧は＋５Ｖより小さいので、ｎ型ＭＯＳＦＥＴ１８はＯＮ状態になる。 When the voltage of +5 V is supplied to the 18th pin of the HDMI connector 11 when the transistor 19 is in the OFF state, the voltage of +5 V is supplied to the gate of the n-type MOSFET 18. Since the threshold voltage of the n-type MOSFET 18 is smaller than + 5V, the n-type MOSFET 18 is turned on.
　ｎ型ＭＯＳＦＥＴ１８がＯＮ状態になると、１９番のピンがｎ型ＭＯＳＦＥＴ１８を介して接地されるので、１９番のピンの電圧レベルが低下してロウレベルになる。この結果、１９番より出力されるホットプラグ検出信号はロウレベルになる。 When the n-type MOSFET 18 is turned on, the 19th pin is grounded via the n-type MOSFET 18, so that the voltage level of the 19th pin is lowered to a low level. As a result, the hot plug detection signal output from No. 19 becomes low level.
　ホットプラグ検出信号がロウレベルである場合、ソース機器は、ＨＤＭＩ装置を認識しない。 When the hot plug detection signal is low level, the source device does not recognize the HDMI device.
　図６に、電源ＯＮ状態のＨＤＭＩ装置において、＋５Ｖの電圧をＨＤＭＩコネクタ１１の１８番のピンに供給した場合の動作を模式的に示す。 FIG. 6 schematically shows an operation in the case where a voltage of +5 V is supplied to the 18th pin of the HDMI connector 11 in the HDMI device in the power-on state.
　図６に示すように、電源ＯＮ状態のＨＤＭＩ装置では、ＨＤＭＩレシーバＩＣ１３は、ハイレベルの制御信号を、抵抗素子１７を介してトランジスタ１９のベースに供給する。これにより、トランジスタ１９はＯＮ状態になる。 As shown in FIG. 6, in the HDMI device in the power-on state, the HDMI receiver IC 13 supplies a high-level control signal to the base of the transistor 19 via the resistance element 17. As a result, the transistor 19 is turned on.
　トランジスタ１９がＯＮ状態になると、ｎ型ＭＯＳＦＥＴ１８のゲートが、トランジスタ１９を介して接地される。その結果、ｎ型ＭＯＳＦＥＴ１８のゲートの電圧レベルが、その閾値電圧より小さなレベル（ロウレベル）になり、ｎ型ＭＯＳＦＥＴ１８がＯＦＦ状態になる。 When the transistor 19 is turned on, the gate of the n-type MOSFET 18 is grounded through the transistor 19. As a result, the voltage level of the gate of the n-type MOSFET 18 becomes lower than the threshold voltage (low level), and the n-type MOSFET 18 is turned off.
　ｎ型ＭＯＳＦＥＴ１８がＯＦＦ状態になると、１８番のピンと１９番のピンとが単に抵抗素子１５を介して接続された状態となり、１９番のピンより、＋５Ｖのホットプラグ検出信号が出力される。 When the n-type MOSFET 18 is turned off, the 18th pin and the 19th pin are simply connected via the resistance element 15, and a + 5V hot plug detection signal is output from the 19th pin.
　ソース機器は、＋５Ｖのホットプラグ検出信号を受信すると、自機器にＨＤＭＩ装置が接続されたことを認識する。そして、ソース機器とＨＤＭＩ装置の間で、図１に示したステップＳ１０２～Ｓ１０５の手順に基づく処理が行われる。 When the source device receives the + 5V hot plug detection signal, the source device recognizes that the HDMI device is connected to the source device. Then, processing based on the procedure of steps S102 to S105 shown in FIG. 1 is performed between the source device and the HDMI device.
　本実施形態のＨＤＭＩ装置によれば、電源ＯＦＦの状態でソース機器に接続された場合に、＋５Ｖの電圧がＨＤＭＩコネクタ１１の１８番のピンに供給されても、１９番のピンより出力されるホットプラグ検出信号のレベルはロウレベルである。このため、ソース機器が、自機器への電源ＯＦＦ状態のＨＤＭＩ装置の接続を認識することはない。よって、ＴＭＤＳ信号がソース機器から電源ＯＦＦ状態のＨＤＭＩ装置へ供給されることがなく、ＴＭＤＳ信号の供給により生じるリーク電流によってＨＤＭＩ装置が誤作動することもない。 According to the HDMI device of the present embodiment, even when a voltage of +5 V is supplied to the 18th pin of the HDMI connector 11 when connected to the source device with the power off, it is output from the 19th pin. The level of the hot plug detection signal is low. For this reason, the source device does not recognize the connection of the HDMI device in the power OFF state to the own device. Therefore, the TMDS signal is not supplied from the source device to the HDMI device in the power-off state, and the HDMI device does not malfunction due to a leakage current generated by supplying the TMDS signal.
　（第２の実施形態）
　図７は、本発明の第２の実施形態であるＨＤＭＩ装置の構成を示すブロック図である。 (Second Embodiment)
FIG. 7 is a block diagram showing a configuration of an HDMI apparatus according to the second embodiment of the present invention.
　本実施形態のＨＤＭＩ装置は、図４に示したＨＤＭＩ装置からメモリ１２を取り除き、ＨＤＭＩレシーバＩＣ１３が、ＥＤＩＤ情報１３ａを保持するように構成したものである。 The HDMI device of the present embodiment is configured such that the memory 12 is removed from the HDMI device shown in FIG. 4 and the HDMI receiver IC 13 holds the EDID information 13a.
　本実施形態のＨＤＭＩ装置では、ＨＤＭＩレシーバＩＣ１３は、ＨＤＭＩコネクタ１１の１５番および１６番のピンを介してソース機器からのアクセスを受け付け、自身が保持しているＥＤＩＤ情報１３ａを１５番および１６番のピンより出力する。この他の動作は、第１の実施形態のものと同じである。 In the HDMI device of the present embodiment, the HDMI receiver IC 13 accepts access from the source device via the 15th and 16th pins of the HDMI connector 11, and the EDID information 13a held by itself is stored in the 15th and 16th. Output from the pin. Other operations are the same as those in the first embodiment.
　本実施形態のＨＤＭＩ装置においても、第１の実施形態と同様、電源ＯＦＦの状態でソース機器に接続された場合は、＋５Ｖの電圧がＨＤＭＩコネクタ１１の１８番のピンに供給されても、１９番のピンより出力されるホットプラグ検出信号のレベルはロウレベルである。このため、ソース機器が、自機器への電源ＯＦＦ状態のＨＤＭＩ装置の接続を認識することはない。よって、ソース機器が、ＥＤＩＤ情報を取得するために、電源ＯＦＦ状態のＨＤＭＩ装置にアクセスすることはない。 Similarly to the first embodiment, in the HDMI device of this embodiment, when connected to the source device in a power-off state, even if a voltage of +5 V is supplied to the 18th pin of the HDMI connector 11, 19 The level of the hot plug detection signal output from the pin No. is low. For this reason, the source device does not recognize the connection of the HDMI device in the power OFF state to the own device. Therefore, the source device does not access the HDMI device in the power-off state in order to acquire the EDID information.
　また、本実施形態のＨＤＭＩ装置においても、電源ＯＮ状態になると、＋５Ｖのホットプラグ検出信号が１９番のピンより出力される。この＋５Ｖのホットプラグ検出信号を受けて、ソース機器は、自機器へのＨＤＭＩ装置の接続を認識し、ＨＤＭＩ装置からＥＤＩＤ情報を取得し、ＴＭＤＳ信号をＨＤＭＩ装置に供給する。この動作によれば、例えば、ソース機器と電源ＯＦＦ状態のＨＤＭＩ装置をＨＤＭＩケーブルで接続した後に、ＨＤＭＩ装置の電源を入れた場合に、ＴＭＤＳ信号がソース機器からＨＤＭＩ装置へ供給されることになる。よって、ＨＤＭＩ装置にてＴＭＤＳ信号に基づく映像が表示される。 Also in the HDMI device of this embodiment, when the power is turned on, a hot plug detection signal of +5 V is output from the 19th pin. Upon receiving this + 5V hot plug detection signal, the source device recognizes the connection of the HDMI device to the device itself, acquires EDID information from the HDMI device, and supplies the TMDS signal to the HDMI device. According to this operation, for example, when the HDMI device is turned on after the source device and the HDMI device in the power-off state are connected by the HDMI cable, the TMDS signal is supplied from the source device to the HDMI device. . Therefore, the video based on the TMDS signal is displayed on the HDMI device.
　以上説明した各実施形態のＨＤＭＩ装置は、本発明の一例であり、その構成や動作については、発明の趣旨を逸脱しない範囲で、当業者が理解し得る変更を適用してもよい。 The HDMI device of each embodiment described above is an example of the present invention, and changes that can be understood by those skilled in the art may be applied to the configuration and operation thereof without departing from the spirit of the invention.
　例えば、図４および図７に示したＨＤＭＩ装置において、ＨＤＭＩレシーバＩＣ以外の制御部が、制御信号をスイッチ回路１４に供給してもよい。この場合、制御部は、例えば、シンク機器全体の動作を制御する制御回路であってもよい。 For example, in the HDMI device shown in FIGS. 4 and 7, a control unit other than the HDMI receiver IC may supply a control signal to the switch circuit 14. In this case, the control unit may be, for example, a control circuit that controls the operation of the entire sink device.
　また、スイッチ回路１４は、図示したものに限定されるものではなく、制御信号が第１のレベル（ハイレベル）である場合は、第１のピン（例えば１８番のピン）に供給された＋５Ｖの電圧の信号をホットプラグ検出信号として第２のピン（例えば１９番のピン）より出力し、制御信号が第２のレベル（ロウレベル）である場合には、＋５Ｖより低い電圧（ロウレベルまたは接地電位）の信号をホットプラグ検出信号として第２のピンより出力することができるのであれば、どのような構成であってもよい。また、ＭＯＳＦＥＴやトランジスタ等の半導体スイッチの代わりにリレー等の機械式スイッチを使用してもよい。このとき、ラッチリレーを使用すれば電力消費をゼロにすることもでき、便宜である。 Further, the switch circuit 14 is not limited to the illustrated one, and when the control signal is at the first level (high level), the + 5V supplied to the first pin (for example, the 18th pin). Is output from the second pin (for example, the 19th pin) as a hot plug detection signal, and when the control signal is at the second level (low level), a voltage lower than +5 V (low level or ground potential) As long as the signal (2) can be output from the second pin as a hot plug detection signal, any configuration may be used. A mechanical switch such as a relay may be used instead of a semiconductor switch such as a MOSFET or a transistor. At this time, if a latch relay is used, power consumption can be reduced to zero, which is convenient.

Claims (8)

  1. 　外部装置と通信ケーブルを介して接続されるコネクタ部を有し、該コネクタ部は、前記外部装置から所定の電圧が供給される第１のピンと、前記外部装置への接続の有無を示すホットプラグ検出信号を出力する第２のピンとを少なくとも備える、ＨＤＭＩ装置であって、
    　前記ＨＤＭＩ装置の電源が入っているときにはその旨を示す第１の信号を出力する制御部と、
    　前記第１の信号が出力されていない場合には前記第２のピンにロウレベルまたは接地電位を出力する回路と、を有するＨＤＭＩ装置。     A connector portion connected to an external device via a communication cable, the connector portion including a first pin to which a predetermined voltage is supplied from the external device, and a hot plug indicating presence / absence of connection to the external device An HDMI device comprising at least a second pin for outputting a detection signal,
    A control unit that outputs a first signal indicating that the HDMI device is powered;
    An HDMI device comprising: a circuit that outputs a low level or a ground potential to the second pin when the first signal is not output;
  2. 　前記回路は、前記第１の信号が出力されている期間において、前記第１のピンに供給された前記所定の電圧の信号を前記ホットプラグ検出信号として前記第２のピンより出力させる、請求項１に記載のＨＤＭＩ装置。 The circuit outputs the signal of the predetermined voltage supplied to the first pin from the second pin as the hot plug detection signal during a period in which the first signal is output. 2. The HDMI device according to 1.
  3. 　前記回路は、前記第１の信号が制御信号として入力され、前記第１の信号が入力されていない期間は、前記第２のピンをロウレベルまたは接地電位とするスイッチを有する、請求項１または２に記載のＨＤＭＩ装置。 The circuit includes a switch for setting the second pin to a low level or a ground potential during a period in which the first signal is input as a control signal and the first signal is not input. The HDMI device described in 1.
  4. 　前記スイッチは、第１乃至第３の抵抗素子と、ＭＯＳＦＥＴと、トランジスタとを有し、
    　前記トランジスタのエミッタと前記ＭＯＳＦＥＴのソースはそれぞれ接地され、
    　前記第１の抵抗素子の一端は、前記第２の抵抗素子の一端に接続されるとともに、前記コネクタ部の前記第１のピンに接続され、
    　前記第１の抵抗素子の他端は、前記ＭＯＳＦＥＴのドレインに接続されるとともに、前記コネクタ部の前記第２のピンに接続され、
    　前記第２の抵抗素子の他端は、前記ＭＯＳＦＥＴのゲートに接続されるとともに、前記トランジスタのコレクタに接続され、
    　前記第１の信号が、前記第３の抵抗素子を介して前記トランジスタのベースに供給され、
    　前記第１の信号が出力されていない期間は、前記トランジスタがオフ状態とされ、前記ＭＯＳＦＥＴがオンとされ、
    　前記第１の信号が出力されている期間は、前記トランジスタがオン状態とされ、前記ＭＯＳＦＥＴがオフとされる、請求項３に記載のＨＤＭＩ装置。     The switch includes first to third resistance elements, a MOSFET, and a transistor.
    The emitter of the transistor and the source of the MOSFET are each grounded,
    One end of the first resistance element is connected to one end of the second resistance element, and is connected to the first pin of the connector portion,
    The other end of the first resistance element is connected to the drain of the MOSFET and to the second pin of the connector part,
    The other end of the second resistance element is connected to the gate of the MOSFET and to the collector of the transistor,
    The first signal is supplied to the base of the transistor via the third resistance element;
    During a period when the first signal is not output, the transistor is turned off, the MOSFET is turned on,
    The HDMI device according to claim 3, wherein the transistor is turned on and the MOSFET is turned off during a period in which the first signal is output.
  5. 　映像／音声信号の解像度およびフォーマットを示す識別データが格納された不揮発性メモリを、さらに有し、
    　前記コネクタ部は、前記外部装置が前記不揮発性メモリから前記識別データを読み出すためのピンを、さらに含む、請求項１乃至４のいずれか１項に記載のＨＤＭＩ装置。     A non-volatile memory in which identification data indicating the resolution and format of the video / audio signal is stored;
    5. The HDMI device according to claim 1, wherein the connector unit further includes a pin for the external device to read the identification data from the nonvolatile memory.
  6. 　前記制御部は、映像／音声信号の解像度およびフォーマットを示す識別データを保持しており、
    　前記コネクタ部は、前記外部装置が前記制御部にアクセスして前記識別データを取得するためのピンをさらに含む、請求項１乃至４のいずれか１項に記載のＨＤＭＩ装置。     The control unit holds identification data indicating the resolution and format of the video / audio signal,
    5. The HDMI device according to claim 1, wherein the connector unit further includes a pin for the external device to access the control unit and acquire the identification data. 6.
  7. 　請求項１乃至６のいずれか１項に記載のＨＤＭＩ装置よりなるシンク機器と、
    　前記シンク機器と通信ケーブルを介して接続されるソース機器と、を有し、
    　前記ソース機器は、所定の電圧を前記シンク機器に供給し、前記シンク機器から前記所定の電圧のホットプラグ検出信号を受信すると、自機器に前記シンク機器が接続されたと認識する、通信システム。     A sink device comprising the HDMI device according to any one of claims 1 to 6;
    A source device connected to the sink device via a communication cable,
    A communication system in which the source device recognizes that the sink device is connected to the source device when the source device supplies a predetermined voltage to the sink device and receives a hot plug detection signal of the predetermined voltage from the sink device.
  8. 　外部装置と通信ケーブルを介して接続されるコネクタ部を有し、該コネクタ部は、前記外部装置から所定の電圧が供給される第１のピンと、前記外部装置への接続の有無を示すホットプラグ検出信号を出力する第２のピンとを少なくとも備えるＨＤＭＩ装置にて行われるホットプラグ制御方法であって、
    　前記ＨＤＭＩ装置の電源が入っている期間は、前記第１のピンに供給された前記所定の電圧の信号を前記ホットプラグ検出信号として前記第２のピンより出力し、
    　前記期間以外は、前記第２のピンをロウレベルまたは接地電位とする、ホットプラグ制御方法。     A connector portion connected to an external device via a communication cable, the connector portion including a first pin to which a predetermined voltage is supplied from the external device, and a hot plug indicating presence / absence of connection to the external device A hot plug control method performed in an HDMI device including at least a second pin for outputting a detection signal,
    While the HDMI device is powered on, the signal of the predetermined voltage supplied to the first pin is output from the second pin as the hot plug detection signal,
    A hot plug control method in which the second pin is set to a low level or a ground potential except during the period.
PCT/JP2012/074555 2012-09-25 2012-09-25 Hdmi device, communication system, and hot-plug control method WO2014049686A1 (en)

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