WO2014049686A1 - Dispositif hdmi, système de communication et procédé de commande de connexion à chaud - Google Patents

Dispositif hdmi, système de communication et procédé de commande de connexion à chaud 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
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English (en)
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/fr
Priority to TW101136805A priority patent/TWI528800B/zh
Priority to EP13842817.2A priority patent/EP2902871A4/fr
Priority to US14/429,342 priority patent/US10176140B2/en
Priority to JP2014538487A priority patent/JP5943439B2/ja
Priority to PCT/JP2013/075682 priority patent/WO2014050807A1/fr
Priority to CN201380050046.8A priority patent/CN104704445B/zh
Publication of WO2014049686A1 publication Critical patent/WO2014049686A1/fr

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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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Power Sources (AREA)

Abstract

L'invention porte sur un dispositif HDMI qui comprend : un connecteur (11) connecté à un dispositif externe par l'intermédiaire d'un câble de communication ; un contrôleur (13) qui, lorsqu'une source d'alimentation du dispositif HDMI est sous tension, délivre un premier signal indiquant que la source d'alimentation du dispositif HDMI est sous tension ; et un circuit (14) qui, dans le cas où le premier signal n'est pas délivré, délivre un potentiel de niveau bas ou de masse à une seconde broche. Le connecteur (11) comprend au moins : une première broche à laquelle une tension prescrite est fournie par le dispositif externe ; et la seconde broche qui délivre un signal de détection de connexion à chaud indiquant si une connexion au dispositif externe a été établie ou non.
PCT/JP2012/074555 2012-09-25 2012-09-25 Dispositif hdmi, système de communication et procédé de commande de connexion à chaud WO2014049686A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
PCT/JP2012/074555 WO2014049686A1 (fr) 2012-09-25 2012-09-25 Dispositif hdmi, système de communication et procédé de commande de connexion à chaud
TW101136805A TWI528800B (zh) 2012-09-25 2012-10-05 High resolution multimedia interface device, communication system and hot plug control method
EP13842817.2A EP2902871A4 (fr) 2012-09-25 2013-09-24 Dispositif électronique, système de communication et procédé de commande de connexion à chaud
US14/429,342 US10176140B2 (en) 2012-09-25 2013-09-24 HDMI apparatus of high-definition TV has switching circuit that outputs low-level/ground potential to second pin of HDMI connector if a first signal is not outputted
JP2014538487A JP5943439B2 (ja) 2012-09-25 2013-09-24 電子機器、通信システムおよびホットプラグ制御方法
PCT/JP2013/075682 WO2014050807A1 (fr) 2012-09-25 2013-09-24 Dispositif électronique, système de communication et procédé de commande de connexion à chaud
CN201380050046.8A CN104704445B (zh) 2012-09-25 2013-09-24 电子装置、通信系统以及热拔插控制方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/074555 WO2014049686A1 (fr) 2012-09-25 2012-09-25 Dispositif hdmi, système de communication et procédé de commande de connexion à chaud

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WO2014049686A1 true WO2014049686A1 (fr) 2014-04-03

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JP (1) JP5943439B2 (fr)
CN (1) CN104704445B (fr)
TW (1) TWI528800B (fr)
WO (1) WO2014049686A1 (fr)

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CN109189621A (zh) * 2018-08-20 2019-01-11 郑州云海信息技术有限公司 一种NVMe SSD热插拔的测试方法及系统
CN110769308B (zh) * 2019-12-25 2021-03-30 深圳创维－Rgb电子有限公司 信号通道切换方法、显示终端及存储介质
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JPWO2014050807A1 (ja) 2016-08-22
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