KR101178037B1 - Auxiliary connection apparatus - Google Patents

Auxiliary connection apparatus Download PDF

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Publication number
KR101178037B1
KR101178037B1 KR20090084422A KR20090084422A KR101178037B1 KR 101178037 B1 KR101178037 B1 KR 101178037B1 KR 20090084422 A KR20090084422 A KR 20090084422A KR 20090084422 A KR20090084422 A KR 20090084422A KR 101178037 B1 KR101178037 B1 KR 101178037B1
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KR
South Korea
Prior art keywords
auxiliary
signal
serial
display
input
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KR20090084422A
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Korean (ko)
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KR20110026668A (en
Inventor
양동평
이성식
정원석
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옵티시스 주식회사
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14Digital output to display device; Cooperation and interconnection of the display device with other functional units
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G5/006Details of the interface to the display terminal
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00Aspects of data communication
    • G09G2370/10Use of a protocol of communication by packets in interfaces along the display data pipeline

Abstract

The auxiliary connection device according to the invention comprises a first auxiliary connection module and a second auxiliary connection module.
When the auxiliary connection module is connected to the auxiliary data transmitter of the display device, the first auxiliary connection module reads and records the extended display identification data (EDID) and the display port configuration data (DPCD) of the display device on behalf of the host device. When connected to the auxiliary data receiver, the EDID and the DPCD are provided to the host device in place of the display device.
When connected to the auxiliary data transmitter of the display device, the second auxiliary connection module reads and records the EDID and the DPCD of the display device on behalf of the host device and performs communication between the display device and the DPCD on behalf of the host device. .
Figure R1020090084422
VESA, EDID, DPCD, DisplayPort

Description

Auxiliary connection apparatus

The present invention relates to an auxiliary connection device, and more particularly, to an auxiliary data transmitter of a display device according to a Display-Port communication standard of the Video Electronics Standards Association (VESA). An auxiliary connection device employed between an auxiliary data receiver of a host device.

Figure 1 shows a typical Display Port system in accordance with VESA's Display-Port communication provisions. Referring to FIG. 1, a conventional Display Port system will be described.

The control unit 121 in the display apparatus 12 includes an extended display identification data (EDID) which is configuration information and control information of the display apparatus 12 and a display port configuration data (DPCD) which is reception-condition information of the display apparatus 12. Is recorded.

The control unit 111 in the host device 11 receives the EDID and the DPCD stored in the serial EEPROM 123 in the display device 12 according to the Display-Port communication rule, and then receives the received EDID. And transmit main data to the control unit 121 in the display apparatus 12 according to the DPCD. Here, the main data refers to video signals in which clock signals are embedded.

In this transmission process, the control unit 111 in the host device 11, according to the Display-Port communication regulations of the Video Electronics Standards Association (VESA), the DP 121 and the DPCD in the display device 12 Communication (called communication for "link training") is performed. The communication of this DPCD is summarized as follows.

First, the control unit 111 in the host device 11 transmits the predetermined transmission-condition information of the host device 11 to the control unit 121 in the display device 12 in accordance with the received DPCD.

Secondly, the control unit 121 in the display device 12 receives the main data according to the received transmission-condition information.

Third, if an error occurs in the process of receiving the main data, the controller 121 in the display apparatus 12 receives a signal indicating that the transmission condition is not suitable for itself through the access signal HPD. 111). For example, the control unit 121 in the display device 12 transmits the connection signal HPD of the pulse string repeating the logics "1" and "0" to the control unit 111 in the host device 11. For reference, while the display apparatus 12 is operating normally, the controller 121 in the display apparatus 12 transmits the connection signal HPD of logic "1" to the controller 111 in the host apparatus 11.

Fourth, when a signal indicating that the transmission condition is not suitable for itself is generated via the connection signal HPD, the control unit 111 in the host device 11 changes the predetermined transmission-condition information of the host device 11, and changes the changed transmission. Condition information is transmitted to the control unit 121 in the display apparatus 12.

And fifth, the second to fourth steps are repeatedly performed.

On the other hand, the display-port interface 112 in the host apparatus 11 includes a main data transmitter 112m and an auxiliary data receiver 112s.

The main data transmitter 112m converts the parallel main data from the controller 111 into serial differential signals, and four pairs of serial differential signals L1 + L1-, L2 + L2-, and L3 + composed of eight lines. L3-, L4 + L4-).

The auxiliary data receiving unit 112s receives a pair of serial differential signals AUX + and AUX- composed of two lines from the display apparatus 12 and parallelizes them according to the Display-Port communication standard. The signal is converted into an input signal and input to the controller 111. For this communication, the auxiliary data receiving unit 112s converts the parallel output signal from the control unit 111 into serial differential signals according to the Display-Port communication standard, thereby making one pair of two lines. Transmit serial differential signals AUX + and AUX- of the display device 12.

In FIG. 1, reference numeral V D denotes a power supply voltage from each of the host apparatus 11 and the display apparatus 12, and HPD denotes a connection signal from the display apparatus 12. Since the connection signal HPD is in the logical " 1 " state when the display apparatus 12 is in operation, the controller 111 in the host apparatus 11 may determine whether the display apparatus 22 is connected to the display apparatus 22. FIG.

The control unit 121 in the display device 12 transmits the EDID and the DPCD recorded according to the Display-Port communication rule to the control unit 111 in the host device 11, and the host device 11. The main data from the control part 111 in the inside is received.

The display-port interface 122 in the display device 12 includes a primary data receiver 122m and an auxiliary data transmitter 122s.

The main data receiver 122m is configured to display-port communication four pairs of serial differential signals (L1 + L1-, L2 + L2-, L3 + L3-, and L4 + L4-) of eight lines. According to the regulation, the signal is converted into a parallel input signal and input to the controller 121.

The auxiliary data transmitter 122s converts the parallel output signal from the controller 121 into serial differential signals according to the Display-Port communication standard, so that the pair of serial differential signals composed of two lines are provided. (AUX +, AUX-) is transmitted to the host device 11. For this communication, the auxiliary data transmitter 122s receives a pair of serial differential signals AUX + and AUX- composed of two lines from the host device 11 and displays them in a Display-Port. According to a communication rule, the signal is converted into a parallel input signal and input to the controller 121.

According to the conventional Display Port system described above with reference to FIG. 1, an extended display identification data (EDID) and a display port configuration data (DPCD) may be a pair of serial differential signals (AUX + and AUX-). As a long-distance transmission or communication of the DPCD, noise and signal attenuation have arisen.

An object of the present invention is to fundamentally solve the problem of noise and signal attenuation generated when Extended Display Identification Data (EDID) and Display Port Configuration Data (DPCD) are transmitted over long distances as serial differential signals, or when long-distance communication of DPCD is performed. It is to provide an auxiliary connection device that can be eliminated.

The auxiliary connection device of the present invention is employed between an auxiliary data transmitter of a display device and an auxiliary data receiver of a host device according to the Display-Port communication regulation of the Video Electronics Standards Association (VESA). It includes a first auxiliary connection module and a second auxiliary connection module (auxiliary).

The first auxiliary connection module reads and records Extended Display Identification Data (EDID) and Display Port Configuration Data (DPCD) of the display device on behalf of the host device when the auxiliary connection module is connected to the auxiliary data transmitter of the display device. When connected to the auxiliary data receiver of the host device, the EDID and the DPCD are provided to the host device in place of the display device.

When the second auxiliary connection module is connected to the auxiliary data transmitter of the display device, the second auxiliary connection module reads and records the EDID and the DPCD of the display device on behalf of the host device, and replaces the display device with the display device. Perform communication of the DPCD.

According to the auxiliary connection device of the present invention, when the first auxiliary connection module is connected to the auxiliary data transmitter of the display device by a user, the EDID (Extended Display Identification Data) and DPCD ( Display Port Configuration Data) is recorded in the first auxiliary connection module.

In this way, when the first auxiliary connection module in which the EDID and the DPCD are recorded is connected to the auxiliary data receiver of the host device, the EDID and the DPCD may always be provided to the host device.

Further, when the second auxiliary connection module is connected to the auxiliary data transmitter of the display device by a user, the second auxiliary connection module may be connected to the display device and the DPCD in place of the host device. Perform communication.

As a result, auxiliary connecting lines may be removed from the connector between the display device and the host device.

Therefore, the problem of noise and signal attenuation generated when the EDID and the DPCD are transmitted over long distances as serial differential signals or when the long-distance communication of the DPCD is performed can be fundamentally solved. In addition, it is economical since auxiliary connecting lines are not necessary.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 shows a display port system including auxiliary connection devices 2H and 2D according to an embodiment of the present invention. In FIG. 3, the same reference numerals as used in FIG. 1 indicate objects of the same function. That is, since the display port system has been described with reference to FIG. 1, only the auxiliary connection devices 2H and 2D and related matters according to an embodiment of the present invention will be described.

Referring to FIG. 3, the auxiliary connection devices 2H and 2D according to an embodiment of the present invention may display the display device 12 according to the Display-Port communication regulation of the Video Electronics Standards Association (VESA). The first auxiliary connection module 2H and the second auxiliary connection module 2H are employed between the auxiliary data transmitter 122s of the host device 11 and the auxiliary data receiver 112s of the host device 11. 2D).

The first auxiliary connection module 2H, when connected to the auxiliary data transmitter 122s of the display device 12, replaces the EDID (Extended Display Identification Data) and DPCD (Display) of the display device on behalf of the host device 11. Port Configuration Data) is read and recorded, and when connected to the auxiliary data receiver 112s of the host device 11, the EDID and DPCD are provided to the host device 11 in place of the display device 12.

When the second auxiliary connection module 2D is connected to the auxiliary data transmitter 122s of the display device 12, the second auxiliary connection module 2D reads and records the EDID and DPCD of the display device 12 on behalf of the host device 11. Instead of the host device 11, the display device 12 communicates with the DPCD.

Therefore, when the first auxiliary connection module 2H is connected to the auxiliary data transmitter 122s of the display apparatus 12 once by the user, the EDID and the DPCD of the display apparatus 12 are connected to the auxiliary ( auxiliary) is recorded in the connection module.

When the first auxiliary connection module 2H on which the EDID and the DPCD are recorded is connected to the auxiliary data receiver 112s of the host device 11, the EDID and the DPCD are always provided to the host device 11. Can be.

In addition, when the second auxiliary connection module 2D is connected to the auxiliary data transmitter 122s of the display apparatus 12 by the user, the second auxiliary connection module 2D is connected to the host device 11. In place of), the display apparatus 12 communicates with the DPCD.

As a result, auxiliary connecting lines may be removed from the connector between the display device 12 and the host device 11.

Therefore, the problem of noise and signal attenuation generated when the EDID and the DPCD are transmitted over long distances as serial differential signals or when the long-distance communication of the DPCD is performed can be fundamentally solved. In addition, it is economical because auxiliary connecting lines are not necessary.

Each of the first auxiliary connection module 2H and the second auxiliary connection module 2D is an auxiliary data transmitter 122s of the display device 12 and an auxiliary data receiver 112s of the host device 11. I / O terminals identical to the I / O terminals 221 to 224 and 211 to 214 are provided.

That is, it includes an auxiliary + signal (AUX +) terminal, an auxiliary- (AUX-) signal terminal, a power supply (V D ) terminal, and a connection signal (HPD) terminal (see FIG. 1).

3 illustrates an internal configuration of the first auxiliary connection module 2H of FIG. 2. 2 and 3, the first auxiliary connection module 2H of FIG. 2 will be described in detail as follows.

The first auxiliary connection module 2H includes a control unit 34, a bidirectional conversion unit 33, and a bidirectional switch 31.

The bidirectional conversion unit 33 converts the serial differential signals AUX + and AUX- from the auxiliary + signal terminal 301 and the auxiliary-signal terminal 302 into 8 bits according to the Display-Port communication standard. Is converted into a parallel input signal and input to the control unit 34.

In addition, the bidirectional conversion unit 33 converts the 8-bit parallel output signal from the control unit 34 into serial differential signals AUX + and AUX- according to the Display-Port communication standard. Output to the signal terminal 301 and the auxiliary signal terminal 302.

The bidirectional switch 31 inputs the connection signal HPD from the connection signal terminal 304 to the control unit 34, and outputs the connection signal from the control unit 34 to the connection signal terminal 304.

The control part 34 makes the control signal HPDcon of the bidirectional switch 31 into a "1" state initially, and makes the bidirectional switch 31 into an input state. That is, the connection state of the first auxiliary connection module 2H is determined according to the logic state of the power supply voltage V D from the power supply terminal 303 and the connection signal HPDin from the bidirectional switch 31.

For example, when the power supply voltage V D from the power supply terminal 303 and the connection signal HPDin from the bidirectional switch 31 are both in a logic "1" state, the first auxiliary connection module 2H is connected to the display device. It is judged that it connected with the auxiliary data transmitter 122s of (12). In this case, the controller 34 maintains the control signal HPDcon of the bidirectional switch 31 in the " 1 " state so that the bidirectional switch 31 maintains the input state.

Here, the control unit 34 reads and records the Extended Display Identification Data (EDID) and Display Port Configuration Data (DPCD) of the display device in place of the host device 11.

In addition, when the power supply voltage V D from the power supply terminal 303 is in a logic "1" state and the connection signal HPDin from the bidirectional switch 31 is in a logic "0" state, the first auxiliary connection module 2H is provided. It is determined that the host device 11 is connected to the auxiliary data receiver 112s. In this case, the control part 44 switches the control signal HPDcon of the bidirectional switch 31 to a "0" state, and generates the connection output signal HPDout of a "1" state.

Here, the controller 34 provides the EDID and the DPCD to the host device 11 in place of the display device 12.

When the power supply voltage V D from the power supply terminal 303 is in a logic "0" state, it is determined that the first auxiliary connection module 2H is not connected to the host device 11 or the display device 12. In this case, the controller 34 maintains the control signal HPDcon of the bidirectional switch 31 in the " 1 " state so that the bidirectional switch 31 maintains the input state.

4 shows an internal configuration of the second auxiliary connection module 2D of FIG. 2. 2 and 4, the second auxiliary connection module 2D of FIG. 2 will be described in detail as follows.

The second auxiliary connection module 2D includes a controller 44, a bidirectional converter 43, and an AND gate 41.

The bidirectional conversion unit 43 converts the serial differential signals AUX + and AUX- from the auxiliary + signal terminal 401 and the auxiliary-signal terminal 402 into 8 bits according to the Display-Port communication standard. Is converted into a parallel input signal and input to the controller 44.

In addition, the bidirectional conversion unit 43 converts the 8-bit parallel output signal from the control unit 44 into serial differential signals AUX + and AUX- according to the Display-Port communication standard. Output to the signal terminal 401 and the auxiliary signal terminal 402.

The AND gate 41 has a logic " 1 " while both the power supply voltage V D from the power supply terminal 403 and the connection signal HPD from the connection signal terminal 404 are in a logic " 1 " state. Is input to the controller 44.

The controller 44 indicates that the second auxiliary connection module 2D is connected to the auxiliary data transmitter 122s of the display apparatus 12 when the input signal from the AND gate 41 is in a logic " 1 " state. To judge.

In this case, the controller 44 reads and records the EDID and the DPCD of the display device 12 on behalf of the host device 11, and communicates the communication between the display device 12 and the DPCD on behalf of the host device 11. To perform.

5 shows an internal configuration of the bidirectional conversion units 33 and 43 in each of the first auxiliary connection module 2H of FIG. 3 and the second auxiliary connection module 2D of FIG. 4. An internal configuration and operation of the bidirectional conversion units 33 and 43 will now be described with reference to FIGS. 3 to 5.

The bidirectional converters 33 and 43 include a subtractor 51, a serial / parallel converter 52, a parallel / serial converter 54, and a differential signal generator 53.

The subtraction section 51 is a serial input which is a result of subtracting the serial differential signal AUX- input from the auxiliary signal terminals 302 and 402 from the serial differential signal AUX + from the auxiliary signal terminals 301 and 401. Generate signal AUX.

The serial / parallel converter 52 converts the serial input signal AUX from the subtracter 51 into an 8-bit parallel input signal according to the Display-Port communication rule, and controls the controllers 34 and 44. Type in

The parallel / serial conversion section 54 converts the 8-bit parallel output signal from the control sections 34 and 44 into a serial output signal AUX in accordance with the Display-Port communication specification.

The differential signal generator 53 converts the serial output signal AUX from the parallel / serial converter 54 into serial differential signals AUX + and AUX-, and the auxiliary + signal terminals 301 and 401 and the auxiliary-signal. Output to signal terminals 302 and 402.

FIG. 6 shows the relationship between the serial differential signals AUX + and AUX- and the serial input / output signals AUX in FIG. 5. In FIG. 6, (a) shows waveforms of serial differential signals AUX + and AUX-, and (b) shows waveforms of serial input / output signals AUX.

5 and 6, the series differential signals AUX + and AUX− that are input or output from the auxiliary + signal terminals 301 and 401 and the auxiliary-signal terminals 302 and 402 may have an intermediate positive potential (V). CM has a low positive potential (V D− ) or a positive potential (V D + ), but are inverted from each other. That is, the series differential signals AUX + and AUX- have a constant potential difference V DIFF .

In the case of a serial input signal AUX input to the serial / parallel converter 52 or a serial output signal AUX output from the parallel / serial converter 54, the middle of the serial differential signals AUX + and AUX- is used. The positive potential (V CM ) is the ground potential at 0 V (volts), the low positive potential (V D- ) of the series differential signals AUX +, AUX- is the negative potential, and the series differential signals ( The high positive potentials V D + of AUX + and AUX−) correspond to the positive potentials, respectively.

In the corresponding state, subtracting the auxiliary-signal (AUX-) from the auxiliary + signal (AUX +) of the serial differential signals AUX + and AUX-, the serial input signal inputted to the serial / parallel converter 52 AUX) is obtained. Therefore, the pulse height 2V DIFF of the serial input signal AUX is twice the potential difference V DIFF between the serial differential signals AUX + and AUX-.

For example, a signal of logic "0" is obtained between t1 and t2, and a signal of logic "1" is obtained between t2 and t3.

Of course, the differential signal generator 53 performs the above processes in reverse.

FIG. 7 shows an operation algorithm of the control unit 34 in the first auxiliary connection module 2H of FIG. 3. Referring to Figs. 1, 3 and 7, the algorithm of Fig. 7 will be described.

First, the control part 34 makes the control signal HPDcon of the bidirectional switch 31 into a "1" state initially, and makes the bidirectional switch 31 into an input state (step S701).

In addition, the controller 34 controls the connection state of the first auxiliary connection module 2H according to the logic state of the power supply voltage V D from the power supply terminal 303 and the connection signal HPDin from the bidirectional switch 31. It determines (step S702).

In step S702, if the power supply voltage V D from the power supply terminal 403 is in a logic " 0 " state, the controller 34 indicates that the first auxiliary connection module 2H is connected to the host device 11 or the display device ( It is determined that it is not connected to 12). In this case, the control unit 34 repeatedly performs the above step S702 until the upper limit time elapses (step S731).

In step S702, when the power supply voltage V D from the power supply terminal 303 is in a logic "1" state and the connection signal HPDin from the bidirectional switch 31 is in a logic "0" state, the control unit 34 Determines that the first auxiliary connection module 2H is connected to the auxiliary data receiving unit 112s of the host device 11. In this case, the control part 34 switches the control signal HPDcon of the bidirectional switch 31 to the "0" state (step S711), and generates the connection output signal HPDout of the "1" state (step S712). ).

Next, the control unit 34 transmits each of the EDID and the DPCD to the host device 11 in accordance with control signals from the host device 11 until the transmission of each of the EDID and the DPCD is completed (steps S713). And S714).

In step S702, if the power supply voltage V D from the power supply terminal 303 and the connection signal HPDin from the bidirectional switch 31 are both in a logic " 1 " state, the controller 34 connects to the first auxiliary connection. It is determined that the module 2H is connected to the auxiliary data transmitter 122s of the display apparatus 12. In this case, the control unit 34 performs the following reading and writing process.

First, the control unit 34 reads the EDID of the display device 12 (step S721).

Next, the control section 34 writes the read EDID to an internal memory, for example, a serial EEPROM (Electrically Erasable and Programmable Read Only Memory) (step S722).

Next, the control part 34 reads the DPCD of the display apparatus 12 (step S723).

Then, the control unit 34 records the read DPCD in the internal memory (step S724).

FIG. 8 shows an operation algorithm of the controller 44 in the second auxiliary connection module 2D of FIG. 4. Referring to Figures 1, 4 and 8, the algorithm of Figure 8 will be described.

First, the control part 44 determines the connection state of the 2nd auxiliary connection module 2D according to the logic state of the input signal from the AND gate 41 (step S801).

In step S801, if the input signal from the AND gate 41 is in the logical " 0 " state, the controller 44 is not connected to the display device 12 by the second auxiliary connection module 2D. I judge that. In this case, the controller 44 repeatedly performs the above step S7801 until the upper limit time elapses (step S831).

In the above step S801, if the input signal from the AND gate 41 is in the logical " 1 " state, the controller 44 determines that the second auxiliary connection module 2D is an auxiliary data transmitter of the display device 12. It is determined that it is connected with 122s. In this case, the controller 44 performs the following process.

First, the controller 44 reads the EDID of the display device 12 (step S821).

Next, the control section 44 writes the read EDID to an internal memory, for example, a serial EEPROM (step S822).

Next, the control section 44 reads the DPCD of the display device 12 (step S823).

Then, the control section 44 writes the read DPCD to the internal memory (step S824).

The controller 44 communicates the DPCD with the controller 121 in the display apparatus 12 (steps S825 and S826). That is, communication for "link training" is performed. The process is described in detail as follows.

First, the controller 44 transmits the predetermined transfer-condition information of the host apparatus 11 to the controller 121 in the display apparatus 12 in accordance with the recorded DPCD (step S825). Here, the first transmission condition information may be input in advance through the auxiliary data receiver 112s of the host device 11.

Accordingly, the control unit 121 in the display device 12 will receive the main data according to the received transmission-condition information. Next, if an error occurs in the process of receiving the main data, the control unit 121 in the display device 12 generates an inappropriate signal through the connection signal HPD that the transmission condition is not suitable for itself. For example, the control unit 121 in the display device 12 generates the connection signal HPD of the pulse train repeating the logic "1" and "0".

Accordingly, when an inappropriate signal of a pulse string repeating logics "1" and "0" is input from the AND gate 41 (step S826), the controller 44 determines the predetermined transmission-condition of the host device 11. The information is changed, and the changed transfer-condition information is transmitted to the control unit 121 in the display apparatus 12 (step S827).

The communication steps S825 and S826 of the DPCD are performed repeatedly.

As described above, according to the auxiliary connection device according to the present invention, when the first auxiliary connection module is connected to the auxiliary data transmitter of the display device once by the user, the EDID (Extended Display Identification Data) of the display device is provided. And Display Port Configuration Data (DPCD) are recorded in the first auxiliary connection module.

In this way, when the first auxiliary connection module in which the EDID and the DPCD are recorded is connected to the auxiliary data receiver of the host device, the EDID and the DPCD may always be provided to the host device.

In addition, when the second auxiliary connection module is connected to the auxiliary data transmitter of the display device by the user, the second auxiliary connection module performs communication between the display device and the DPCD on behalf of the host device.

As a result, auxiliary connecting lines can be removed from the connector between the display device and the host device.

Therefore, the problem of noise and signal attenuation generated when the EDID and the DPCD are transmitted over long distances as serial differential signals or when the long-distance communication of the DPCD is performed can be fundamentally solved. In addition, it is economical because auxiliary connecting lines are not necessary.

The present invention can be used when one communication device must read information of the other communication device in advance for data transmission.

1 is a block diagram illustrating a conventional Display Port system.

2 is a block diagram illustrating a display port system including an auxiliary connection device according to an embodiment of the present invention.

3 is a diagram illustrating an internal configuration of the first auxiliary connection module of FIG. 2.

4 is a diagram illustrating an internal configuration of a second auxiliary connection module of FIG. 2.

FIG. 5 is a diagram illustrating an internal configuration of a bidirectional conversion unit in each of the first auxiliary connection module of FIG. 3 and the second auxiliary connection module of FIG. 4.

6 is a waveform diagram illustrating a relationship between serial differential signals and serial input / output signals in FIG. 5.

7 is a flowchart illustrating an operation algorithm of a controller in the first auxiliary connection module of FIG. 3.

8 is a flowchart illustrating an operation algorithm of a controller in the second auxiliary connection module of FIG. 4.

<Explanation of symbols for the main parts of the drawings>

11 Host unit, 111, 121, 34, 44 ...

112, 122 display-port interface, 112 m ... main data transmitter,

112s ... Auxiliary data receiver, 122m ... Main data receiver,

122s ... Auxiliary data transmitter, 2H ... 1st auxiliary connection module,

2D ... 2nd auxiliary connection module, 31 ...

33, 43, bidirectional conversion section, 41 ... AND gate,

51 ... subtraction part, 52 ... serial / parallel conversion part,

53 ... differential signal generator, 54 ... parallel / serial converter.

Claims (9)

  1. In the auxiliary connection device employed between the auxiliary data transmitter of the display device and the auxiliary data receiver of the host device according to the Display-Port communication regulation of the Video Electronics Standards Association (VESA),
    When connected to the auxiliary data transmitter of the display device, an EDID (Extended Display Identification Data) and a Display Port Configuration Data (DPCD) of the display device are read and recorded on behalf of the host device, and when connected to the auxiliary data receiver of the host device. A first auxiliary connection module for providing the EDID and the DPCD to the host device in place of the display device;
    When connected to the auxiliary data transmitter of the display device, the second assistant reads and records the EDID and DPCD of the display device on behalf of the host device, and performs communication between the display device and the DPCD on behalf of the host device. auxiliary Auxiliary connection device with connection module.
  2. The method of claim 1, wherein in the first auxiliary connection module,
    And an auxiliary connection unit having the same input / output terminals as the input / output terminals of the auxiliary data transmitter of the display device and the auxiliary data receiver of the host device.
  3. The method of claim 2, wherein in the first auxiliary connection module,
    The input and output terminals,
    Auxiliary connections including auxiliary + signal terminals, auxiliary-signal terminals, power terminals and connecting signal terminals.
  4. The method of claim 3, wherein the first auxiliary connection module,
    A control unit;
    Serial differential signals from the auxiliary + signal terminal and the auxiliary-signal terminal are converted into parallel input signals according to the Display-Port communication regulations and input to the control unit, and the parallel output signals from the control unit are input. A bidirectional conversion unit converting the serial differential signals into output signals to the auxiliary signal terminal and the auxiliary signal terminal according to a Display-Port communication standard; And
    And an bidirectional switch for inputting a connection signal from the connection signal (HPD) terminal to the control unit and outputting a connection signal from the control unit to the connection signal (HPD) terminal.
  5. The method of claim 4, wherein the bidirectional conversion unit,
    A subtraction unit for generating a serial input signal that is a result of subtraction of the serial differential signal input from the auxiliary signal terminal from the serial differential signal from the auxiliary + signal terminal;
    A serial / parallel converter for converting the serial input signal from the subtractor into the parallel input signal according to the Display-Port communication rule and inputting the parallel input signal to the controller;
    A parallel / serial conversion unit for converting the parallel output signal from the control unit into a serial output signal according to the Display-Port communication rule; And
    An auxiliary connection device including a differential signal generator for converting a serial output signal from the parallel / serial converter into serial differential signals and outputting the serial output signal to the auxiliary + signal terminal and the auxiliary signal terminal.
  6. The method of claim 1, wherein in the second auxiliary connection module,
    And an auxiliary connection device having the same input / output terminals as the input / output terminals of the auxiliary data transmitter of the display device and the auxiliary data receiver of the host device.
  7. The method of claim 6, wherein in the second auxiliary connection module,
    The input and output terminals,
    Auxiliary connections including auxiliary + signal terminals, auxiliary-signal terminals, power terminals and connecting signal terminals.
  8. The method of claim 7, wherein the second auxiliary connection module,
    A control unit;
    Serial differential signals from the auxiliary + signal terminal and the auxiliary-signal terminal are converted into parallel input signals according to the Display-Port communication regulations and input to the control unit, and the parallel output signals from the control unit are input. A bidirectional conversion unit converting the serial differential signals into output signals to the auxiliary signal terminal and the auxiliary signal terminal according to a Display-Port communication standard; And
    An auxiliary connection including an AND gate for inputting a signal of logic " 1 " to the controller while the power supply voltage from the power supply terminal and the connection signal from the connection signal terminal are both in a logic " 1 " state. Device.
  9. The method of claim 8, wherein the bidirectional conversion unit,
    A subtraction unit for generating a serial input signal which is a result of subtracting a serial differential signal input from the auxiliary signal terminal from the serial differential signal from the auxiliary signal terminal;
    A serial / parallel converter for converting the serial input signal from the subtractor into the parallel input signal according to the Display-Port communication rule and inputting the parallel input signal to the controller;
    A parallel / serial conversion unit for converting the parallel output signal from the control unit into a serial output signal according to the Display-Port communication rule; And
    An auxiliary connection device including a differential signal generator for converting a serial output signal from the parallel / serial converter into serial differential signals and outputting the serial output signal to the auxiliary + signal terminal and the auxiliary signal terminal.
KR20090084422A 2009-09-08 2009-09-08 Auxiliary connection apparatus KR101178037B1 (en)

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KR101414447B1 (en) * 2013-07-02 2014-07-08 옵티시스 주식회사 Dual mode Display-Port connector
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