WO2012137274A1 - Dispositif de commande et procédé de commande associé - Google Patents

Dispositif de commande et procédé de commande associé Download PDF

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Publication number
WO2012137274A1
WO2012137274A1 PCT/JP2011/058411 JP2011058411W WO2012137274A1 WO 2012137274 A1 WO2012137274 A1 WO 2012137274A1 JP 2011058411 W JP2011058411 W JP 2011058411W WO 2012137274 A1 WO2012137274 A1 WO 2012137274A1
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WO
WIPO (PCT)
Prior art keywords
communication
display device
clock signal
data signal
control
Prior art date
Application number
PCT/JP2011/058411
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English (en)
Japanese (ja)
Inventor
一暁 坂元
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/JP2011/058411 priority Critical patent/WO2012137274A1/fr
Priority to JP2013508638A priority patent/JPWO2012137274A1/ja
Publication of WO2012137274A1 publication Critical patent/WO2012137274A1/fr

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    • 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
    • H04N21/4104—Peripherals receiving signals from specially adapted client devices
    • H04N21/4126—The peripheral being portable, e.g. PDAs or mobile phones
    • H04N21/41265—The peripheral being portable, e.g. PDAs or mobile phones having a remote control device for bidirectional communication between the remote control device and client device

Definitions

  • the present invention relates to a control device that is connected to a display device and controls the connected display device, and a control method therefor.
  • a control system such as a personal computer communicates with a display device such as a projector or a display in conformity with the DDC / CI (Display Data Channel Command Command Interface) standard, and controls the display system to display an image. It is disclosed in Patent Document 1 (International Publication No. 2006/043547).
  • control device is connected to the display device via the clock line and the data line which are communication lines, and transmits a clock signal for synchronizing with the display device to the display device via the clock line.
  • data signals that are various control signals are transmitted to and received from the display device via the data line.
  • phase relationship between the clock signal and the data signal is fixed.
  • various display devices are connected to the control device according to the usage mode of the user.
  • the control device and the display device may In some cases, communication cannot be performed or errors frequently occur, so that the control device cannot stably control the display device.
  • An object of the present invention is to provide a control device and a control method thereof capable of communicating with the display device under conditions suitable for the connected display device.
  • control device of the present invention provides: A control device that communicates with the display device via the first and second lines and controls the display device, A clock signal for establishing synchronization with the display device is transmitted to the display device via the first line, and a data signal for controlling the display device is transmitted via the second line to the display device.
  • a communication unit that transmits and receives data to and from the device and performs the communication; When success or failure of the communication is determined and the communication unit fails in the communication, a phase relationship between the clock signal and the data signal is determined between the clock signal and the data signal transmitted when the communication fails.
  • a control unit that causes the communication unit to transmit the signal different from the phase relationship.
  • control method of the control device of the present invention includes: A control method for a control device that communicates with a display device via first and second lines and controls the display device, A communication unit transmits a clock signal for establishing synchronization with the display device to the display device via the first line, and transmits a data signal for controlling the display device to the second line.
  • the control unit determines the success or failure of the communication, and when the communication unit fails in the communication, the phase relationship between the clock signal and the data signal is changed to the clock signal transmitted when the communication fails and the Different from the phase relationship with the data signal, the data is transmitted to the communication unit.
  • control device can communicate with the display device under conditions suitable for the connected display device.
  • FIG. 1 It is a block diagram which shows the structure of the control apparatus of one Embodiment of this invention. It is a flowchart which shows operation
  • FIG. 1 is a diagram illustrating an example of a display system to which a control device according to an embodiment of the present invention is applied.
  • control device 10 such as a personal computer and a display device 20 such as a projector and a display.
  • display device 20 such as a projector and a display.
  • the control device 10 communicates with the display device 20 in accordance with the DDC / CI standard via the clock line (SCL) 31 as the first line and the data line (SDA) 32 as the second line, and displays The device 20 is controlled.
  • SCL clock line
  • SDA data line
  • the control device 10 transmits a clock signal to the display device 20 via the clock line 31 and transmits / receives a data signal to / from the display device 20 via the data line 32.
  • the data signal transmitted from the display device 20 includes EDID (Extended Display Identification Data) data indicating the model information of the display device 20 and the like.
  • the data signal transmitted from the control device 10 includes a DDC / CI command indicating control content.
  • the control device 10 acquires EDID data from the display device 20, checks whether the display device 20 is compatible with the DDC / CI command, and checks the DDC / CI command. If it is possible to cope with the above, a DDC / CI command is transmitted.
  • the display device 20 displays images and the like according to the control of the control device 10.
  • control device 10 and the display device 20 will be described. Since the present invention relates to how the control device 10 can communicate under conditions suitable for the connected display device 20, the following mainly relates to the above points. The configuration will be described, and description of other configurations will be omitted.
  • the display device 20 includes an E2PROM (Electrically Erasable Programmable Read-Only Memory) 21 and a main CPU (Central Processing Unit) 22.
  • E2PROM Electrically Erasable Programmable Read-Only Memory
  • main CPU Central Processing Unit
  • the E2PROM 21 and the main CPU 22 are connected to the control device 10 via the SCL 31 and SDA 32, respectively.
  • the E2PROM 21 stores the EDID data of the display device 20 and transmits the EDID data stored via the SDA 32 to the control device 10 in response to a request from the control device 10.
  • the main CPU 22 receives a DDC / CI command transmitted from the control device 10 via the SDA 32, and controls each unit (not shown) in the display device 20 according to the control content indicated by the received DDC / CI command. .
  • the control device 10 includes a control unit 11, a communication unit 12, and a storage unit 13.
  • the control unit 11 causes the communication unit 12 to transmit a clock signal via the SCL 31 and to transmit a data signal via the SDA 32.
  • control unit 11 stores various information in the storage unit 13.
  • the communication unit 12 transmits a clock signal and a data signal to the display device 20 under the control of the control unit 11. Further, the communication unit 12 receives a data signal such as EDID data transmitted from the display device 20 and outputs the data signal to the control unit 11.
  • the storage unit 13 stores various information according to the control of the control unit 11.
  • control device 10 when connected to the display device 20 will be described with reference to the flowchart shown in FIG.
  • the control unit 11 instructs the communication unit 12 to cause the E2PROM 21 of the display device 20 to transmit a clock signal via the SCL 31, and via the SDA 32.
  • a data signal requesting transmission of EDID data is transmitted.
  • the control unit 11 causes the communication unit 12 to transmit a clock signal having a default clock frequency whose delay amount with respect to the data signal is a default delay amount.
  • the control unit 11 stores a different clock frequency as the clock frequency of the settable clock signal, and as a delay amount of the clock signal with respect to the settable data signal, In addition to the default delay amount, different delay amounts are stored.
  • control unit 11 determines whether or not the communication unit 12 has successfully obtained EDID data (step S22).
  • step S22 Yes
  • the control unit 11 ends the process.
  • step S22 If acquisition of EDID data fails (step S22: No), the control unit 11 sends the clock signal and data signal having each delay amount to the communication unit 12 for all delay amounts stored as settable. It is determined whether or not transmission is attempted and acquisition of EDID data is attempted (step S23).
  • step S23 When the acquisition of EDID data is not attempted for all delay amounts (step S23: No), the control unit 11 instructs the communication unit 12 to receive a clock signal having a delay amount for which acquisition of EDID data is not attempted, and The data signal is transmitted to the E2PROM 21 (step S24), and the process returns to step S22.
  • FIG. 3A is a diagram illustrating an example of a waveform of a signal transmitted by the communication unit 12.
  • the controller 11 stores no delay as the default delay amount of the clock signal with respect to the data signal.
  • the communication unit 12 transmits a data signal (SDA) and a clock signal (SCL (Delay 0)) having no delay with respect to the data signal (SDA).
  • the control unit 11 uses the delay amount (Delay 1) as the delay amount of the clock signal with respect to the data signal.
  • the communication unit 12 transmits a data signal (SDA) and a clock signal (SCL (Delay 1)) delayed by a delay amount (Delay 1) with respect to the data signal (SDA). That is, when communication fails, the control unit 11 changes the phase relationship between the data signal and the clock signal, and causes the communication unit 12 to transmit the clock signal and the data signal again.
  • the control unit 11 uses the delay amount (Delay 2) as the delay amount of the clock signal with respect to the data signal.
  • the communication unit 12 transmits a data signal (SDA) and a clock signal (SCL (Delay 2)) delayed by a delay amount (Delay 2) with respect to the data signal (SDA).
  • control unit 11 changes the delay amount of the clock signal with respect to the data signal, and causes the communication unit 12 to transmit.
  • step S24 the example of changing the delay amount of the clock signal with respect to the data signal has been described.
  • the present invention is not limited to this, and as shown in FIG. It may be changed.
  • step S23 when the acquisition of EDID data is attempted for all delay amounts (step S23: Yes), the control unit 11 uses the clocks for all the clock frequencies stored as settable. A frequency clock signal is transmitted to the communication unit 12, and it is determined whether or not acquisition of EDID data has been attempted (step S25).
  • step S25 If acquisition of EDID data is not attempted for all clock frequencies (step S25: No), the control unit 11 instructs the communication unit 12 to send a clock signal having a clock frequency for which acquisition of EDID data is not attempted to the E2PROM 21. (Step S26), and the process returns to step S22.
  • the control part 11 fixes the relationship between phases of a clock signal and a data signal, for example.
  • step S25 If it is attempted to acquire EDID data for all clock frequencies (step S25: Yes), the control unit 11 determines a communication error (step S27) and ends the process.
  • the control unit 11 determines whether the display device 20 having the E2PROM 21 is compatible with the DDC / CI command based on the EDID data acquired from the E2PROM 21. When the display device 20 is compatible with the DDC / CI command, the control unit 11 instructs the communication unit 12 to obtain the same phase relationship between the data signal and the clock signal as when the EDID data was successfully acquired.
  • a DDC / CI command which is a data signal, and a clock signal are transmitted to the main CPU 22 of the display device 20 at the clock frequency.
  • the control unit 11 receives EDID data transmitted from the display device 20 having the main CPU 22, as shown in FIG.
  • the clock frequency of the clock signal (EDID Freq) and the phase relationship between the clock signal and the data signal (delay amount: EDID Delay) when the EDID data is successfully acquired in correspondence with the model information shown in Stores the clock frequency (DDC / CI Freq) of the clock signal and the phase relationship between the clock signal and the data signal (delay amount: DDC / CI Delay) when the DDC / CI command is successfully transmitted. Is stored in the storage unit 13.
  • the control unit 11 uses the clock frequency (EDID Freq) and the phase relationship (EDID Delay) stored in the storage unit 13 to display the display device 20 Attempts to acquire EDID data from the E2PROM 21 included in 20.
  • EDID Freq clock frequency
  • EDID Delay phase relationship
  • the control unit 11 stores the clock frequency (DDC / CI Freq) stored in the storage unit 13 corresponding to the model information indicated in the EDID data. Using the phase relationship (DDC / CI Delay), communication is performed with the main CPU 22 of the display device 20.
  • the control device 10 when the communication with the display device 20 fails, the control device 10 indicates the phase relationship between the clock signal and the data signal and the phase between the clock signal and the data signal transmitted when the communication fails. It is made different from the relationship and transmitted to the display device 20.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

L'invention porte sur un dispositif de commande, servant à communiquer avec un dispositif d'affichage par des première et seconde lignes et à commander le dispositif d'affichage, qui comprend : une unité de communication qui établit une communication par transmission au dispositif d'affichage, par la première ligne, d'un signal d'horloge servant à établir une synchronisation avec le dispositif d'affichage et par transmission au dispositif d'affichage, et réception en provenance de celui-ci, par la seconde ligne, d'un signal de données servant à commander le dispositif d'affichage ; et une unité de commande qui détermine si une communication est établie et, lorsque l'unité de communication échoue à établir une communication, transmet à l'unité de communication la relation de phase entre le signal d'horloge et le signal de données après modification de la relation de phase entre le signal d'horloge et le signal de données émis une fois qu'une communication a échoué à être établie.
PCT/JP2011/058411 2011-04-01 2011-04-01 Dispositif de commande et procédé de commande associé WO2012137274A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2011/058411 WO2012137274A1 (fr) 2011-04-01 2011-04-01 Dispositif de commande et procédé de commande associé
JP2013508638A JPWO2012137274A1 (ja) 2011-04-01 2011-04-01 制御装置およびその制御方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2011/058411 WO2012137274A1 (fr) 2011-04-01 2011-04-01 Dispositif de commande et procédé de commande associé

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WO (1) WO2012137274A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0314335A (ja) * 1989-06-13 1991-01-23 Fujitsu Ten Ltd シリアル通信装置
JP2003202936A (ja) * 2002-01-08 2003-07-18 Mitsubishi Electric Corp 半導体集積回路
JP2007158719A (ja) * 2005-12-05 2007-06-21 Fuji Xerox Co Ltd 画像読み取り装置およびサンプリングタイミング決定方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0314335A (ja) * 1989-06-13 1991-01-23 Fujitsu Ten Ltd シリアル通信装置
JP2003202936A (ja) * 2002-01-08 2003-07-18 Mitsubishi Electric Corp 半導体集積回路
JP2007158719A (ja) * 2005-12-05 2007-06-21 Fuji Xerox Co Ltd 画像読み取り装置およびサンプリングタイミング決定方法

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