JP2002229502A - Display unit communication system and its communicating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display unit communication system which is flexibly adaptive to applications and can make communication efficient. SOLUTION: A control unit CU1 has a 1st communication process of storing image data corresponding to an image area that the control unit should supply and transmitting part of image data to be displayed in a 1st image area composed of a display unit connected to one terminal adapter through a 2nd communication line L2 to all terminal adapters sequentially by the terminal adapters and a 2nd communication process of repeating the 1st communication process by the control unit until all the image data that respective 1st image areas should display are supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display unit communication having a control unit for supplying image data to a plurality of display units and a display unit for driving a display element based on the image data supplied from the control unit. The present invention relates to a system and a communication method thereof.

[0002]

2. Description of the Related Art In recent years, high performance red, green and blue LEs have been developed.
D was developed to enable full-color LED display. Among large-sized display devices, LED display devices that take advantage of the characteristics of LEDs, such as high brightness, long life, and light weight, are rapidly spreading. In addition, applications thereof are diversifying, and a system that can flexibly cope with various applications such as large-sized televisions, advertisements, traffic information, three-dimensional displays, and lighting is demanded.

[0003] The displays using such LEDs are from large displays for outdoor use such as for billboards to medium and small screen sizes of semi-indoors such as platforms, depending on the application and location. Displays having various screen sizes and pixel pitches have been used. In addition, the conventional vertical / horizontal screen ratio (aspect ratio) also tends to change. When displaying high-definition video such as HDTV by LED display, the amount of video data increases and the display panel becomes even larger. We must respond to the change. In addition, under the advanced information network, the display is also required to be connected to such a communication infrastructure and to be able to respond to display control, maintenance, and the like by remote control.

[0004] Such displays are, for example, 16
It is composed by arranging LEDs of about 16 dots × 16 dots in a matrix, modularizing this as one LED unit, and connecting the LED units in a matrix according to the screen size and the vertical / horizontal aspect ratio. You. FIG. 18 shows an LED display 8 as a configuration example.
01 is shown. A plurality of distributors 804 connected to the controller 803 are provided for each row of the LED unit 802, and transmit video data for display and various control signals to each LED.
Supply to the unit 802.

The control signal 820 includes, for example, a video data synchronization clock, a horizontal synchronization signal, a vertical synchronization signal, a blank signal, a gradation reference signal, and a video data latch signal. Then, the light is supplied to each LED unit 802 via the distributor 804. The display full-color video data 810 transmitted from the distributor 804 to each LED unit 802 is at least RG
Video data of each color B (red, green, blue) is required, and the bit width of the video data is determined according to the gradation resolution.

For example, when displaying with 256 gradations per color, a video data bus having an 8-bit width for three colors is required. These video data are supplied to the LED unit 802 by dividing the number of LED units × the number of display dots by time. The video data 810 is bit-shifted by the shift register circuit 805 in each LED unit 802, and the data is latched when a predetermined number of data is supplied.
The captured video data can be displayed as the display video data 810.

[0007]

However, such an LED display device includes a controller 803 and a distributor 80.
4 and display video data 810 between LED unit 802
Is transmitted by a parallel bus as a signal interface, and a synchronous clock synchronized with the signal and various control signals 820 are supplied. Therefore, there is a problem that the number of signal lines increases as the definition or size of the LED display device increases. In particular, at present, where the display screen is large and the number of LED units tends to increase, if the number of signal lines increases and becomes longer, the influence on the reference signal for gradation, the pulse width of the synchronizing clock of the video data, the noise, and the noise becomes a serious problem. Become.

Also, in order to comply with the HDTV specification, the aspect ratio of the screen changes, and it becomes necessary to further increase the number of LED units to be connected, and the transfer rate of video data must be increased accordingly. As the number of connected LED units increases, the pulse deterioration of each signal increases, and in particular, there is a problem that input / output timing between video data and a synchronous clock becomes more difficult.

[0009] Furthermore, the required level of image quality in the image display of the LED display device has been increasing year by year, and together with the miniaturization of the LED, the technical development of an LED display capable of fine display has been urgently required. In order to realize a high-definition display of an image, it is necessary to increase the gradation resolution. Specifically, it is necessary to change the bus specification such as changing the conventional display video data bus width from 8 bits to 10 bits. Also, in order to realize a fine display, L
It is also necessary to reduce the ED and the dot pitch width. When the dot pitch is reduced, the LED unit size is reduced in proportion thereto. For this reason, there is a problem that the ratio of the mounting area of components such as connectors is increased due to the increase in the width of the video data bus.

Further, the conventional LED display device cannot communicate with a plurality of LED display devices having different display gradations or the number of pixels per LED display device by a common communication method. Was.

An object of the present invention is to provide a display unit communication system and a communication method thereof that can flexibly cope with an application and improve communication efficiency.

[0012]

To achieve the above object, a communication method in a display unit communication system according to the present invention includes a plurality of display units for driving one or more display elements based on supplied image data. ,
At least one control unit for supplying image data to be displayed by the display unit, the control unit being connected to the control unit by a first communication line, and being connected to the display unit by a second communication line, In a communication method in a display unit communication system having a plurality of terminal adapters for storing image data to be displayed by the display unit supplied from a control unit and transferring the stored image data to the display unit, the control unit includes: ,
The control unit to be supplied stores image data corresponding to an image region to be supplied, and a first image region constituted by a display unit connected to the one terminal adapter by a second communication line is displayed. A part of the image data to be output is firstly transferred to all terminal adapters for each terminal adapter.
And a second communication step in which the control unit repeats the first communication step until all of the image data to be displayed in the respective first image areas is supplied. Communication process.

Further, in the communication method in the display unit communication system according to the present invention, the terminal adapter may convert the image data stored by the terminal adapter in the first communication step within one cycle time of the first communication step. And a third communication step for supplying the display unit to be transferred.

Further, in the communication method in the display unit communication system according to the present invention, the display unit communication system may be configured such that the display elements are LEDs and m rows and n rows.
A memory arranged in a matrix of columns for storing the supplied image data to be displayed by the display unit for each row or column, and for each row or column supplied to the memory within one frame period The display unit has a display unit that repeatedly turns on and displays the LED N times (N is an integer of 1 or more) for each row or column in the order of data. Based on this, the transmission order of the image data to be displayed by the display unit to the display unit can be set for each row or column.

Further, in the communication method in the display unit communication system according to the present invention, communication performed on the first communication line is faster than communication performed on the second communication line.

Further, in order to achieve the above object, a display unit communication system according to the present invention comprises: a plurality of display units for driving one or more LEDs based on supplied image data; At least one control unit for supplying image data, the control unit and a first
While connected by a communication line, is connected by the display unit and a second communication line, stores the image data to be displayed by the display unit supplied from the control unit,
In a display unit communication system having a plurality of terminal adapters for transferring stored image data to the display unit, the control unit stores image data corresponding to an image area to be supplied, and stores the image data in one terminal adapter. A part of the image data to be displayed in the first image area composed of the display units connected by the two communication lines is sequentially transmitted to all the terminal adapters by the first communication line for each terminal adapter. And the transmission of a part of the image data to be displayed by the first image area is repeated until all of the image data to be displayed by the respective first image areas is supplied.

Further, in the display unit communication system according to the present invention, the terminal adapter transmits the image data stored by the terminal adapter to the display unit to be transferred within one cycle time corresponding to the first cycle time. Supply.

Further, in the display unit communication system according to the present invention, in the display unit communication system, the display unit may display the display element by LE.
D is arranged in a matrix of m rows and n columns and has a memory for storing the supplied image data to be displayed by the display unit for each row or column, and the rows supplied to the memory within one frame period. Alternatively, the display unit is a display unit that repeatedly turns on and displays the LED N times (N is an integer of 1 or more) for each row or column in the order of image data for each column, and the control unit is repeatedly turned on and displayed within one frame period. Based on the number N, the transmission order of the image data to be displayed by the display unit to the display unit can be set for each row or column.

Further, in the display unit communication system according to the present invention, the control unit includes an image data memory for sequentially storing image data of an entire image area input from a video source at an address corresponding to an input order; Part of the image data to be displayed by the image area is sequentially transmitted to all terminal adapters for each terminal adapter, and the first image area is transmitted until all of the image data to be displayed is supplied. An address memory for storing the transmission order of the address corresponding to the image data to be transmitted, and a transmission order stored in the address memory so that one image area repeatedly transmits a part of the image data to be displayed. Based on the read image data of the corresponding address from the image data memory,
A control unit that transmits a part of the image data to be displayed by the first image area to the terminal adapter;

Further, in the display unit communication system according to the present invention, the control unit may further include R,
The controller has an RGB counter for distinguishing data of each of G and B, and the control unit converts image data of a corresponding address from the image data memory based on the transmission order and the RGB counter stored in the address memory. And reading a part of the image data to be displayed by the first image area to the terminal adapter.

Further, in the display unit communication system according to the present invention, communication performed on the first communication line is faster than communication performed on the second communication line.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Schematic of Display Unit Communication System) FIGS. 1 and 2 are schematic diagrams of a display unit communication system according to an embodiment of the present invention. Reference numeral 10 denotes a display for performing display based on image data to be displayed.
Are divided into a plurality of display blocks 10b as a first image area composed of the display units connected by the communication lines. Further, a plurality of display units 3 are arranged in each display block 10b. The control unit 1 includes a video processor 11 that supplies image data (video source) to be displayed on the display 10 and a computer 1 that controls the control unit 1 using control data.
2 and communicates with the terminal adapter 2 corresponding to the display block 10b via the first communication line L1. Further, each terminal adapter 2 communicates with the display unit 3 corresponding to the display block 10b via the second communication line L2. The computer 12 is connected to a network.

Here, the connection is made up of two hierarchies in which the first communication line L1 is an upper communication line and the second communication line L2 is a lower communication line. May be composed of a plurality of layers.
In this case, terminal adapters corresponding to the layers are arranged.

The display unit communication system according to the present invention comprises a plurality of display units 3 for driving one or more display elements based on the supplied image data, and at least one display unit 3 for supplying image data to be displayed by the display unit 3. The control unit 1 includes a plurality of terminal adapters 2 connected to the control unit 1 by a first communication line L1 and connected to the display unit 3 by a second communication line L2. The control unit 1 stores the image data to be supplied, for example, the image data corresponding to the entire image area to be displayed by the display 10 when there is one control unit 1, and stores the second A part of the image data to be displayed by the display block 10b (first image area) composed of the display units 3 connected by the communication line is sequentially transmitted to all terminal adapters for each terminal adapter by the first communication. The transmission is performed in the first cycle (T1) by the line. Terminal adapter 2
Is within one cycle time (T1) corresponding to the first cycle time,
For example, at the second cycle time T3 (T3 ≦ T1), the image data stored in the terminal adapter 2 is supplied to the display unit to be transferred. The control unit 1 controls each display block 10b (first
The display block 10b (the first image area) repeatedly transmits part of the image data to be displayed until all of the image data to be displayed by the display area 10 is supplied, so that the display 10 should display the image data. Image data of the entire image area is communicated.

That is, according to the communication method of the display unit communication system of the present invention, the control unit stores the image data corresponding to the image area to be supplied and is connected to one terminal adapter by the second communication line. A first communication step of transmitting a part of image data to be displayed by a first image area constituted by a display unit to all terminal adapters for each terminal adapter in sequence by a first communication line; A second communication step in which the unit repeatedly performs the first communication step until all of the image data to be displayed in the respective first image areas is supplied. For example, in the first communication step, part of the image data to be displayed by the display block 10b (first image area) transmitted by the control unit 1 for each terminal adapter is displayed on the display block 10b (first image area). Of image data to be displayed
/ K (k is an integer of 2 or more), the control unit 1 repeats the first communication step k times in the second communication step, so that the display unit 10b (the first image area) Can supply all the image data to be displayed. (Outline of Connection Between Terminal Adapters) In the display block 10b, a terminal adapter 2 for identifying image data corresponding to the display block and transmitting necessary image data to each display unit 3 is arranged. Each terminal adapter 2 is connected to the control unit 1 in series by a first communication line L1.

When the terminal adapters 2 are arranged for each row, as shown in FIG. 1, the first communication starts at the beginning of a certain M-th row (M is an integer of 1 or more) as viewed from the control unit 1. A terminal in which the first communication line L1 is connected in series from the terminal adapter 2 to which the line L1 is connected to the adjacent terminal adapter 2 sequentially, and then the terminal to which the first communication line L1 is connected at the end of the M-th line M + 1 located on the opposite side of the terminal adapter 2 to which the first communication line L1 is connected at the beginning of the Mth row from the adapter 2
The first communication line L1 is connected to the terminal adapter 2 in the row, and the first communication line L1 is sequentially connected to the terminal adapter 2 in the direction of the terminal adapter 2 to which the first communication line L1 is connected at the beginning of the Mth row. It is preferable that the first communication line L1 be connected in series to the adjacent terminal adapter 2.

With this configuration, the first communication line L1 can be shortened when switching the line to which the display block 10b to be connected belongs. In a large-sized display, the communication line is particularly long, so that the influence of pulse deterioration and noise of communication data is particularly large, and it is important to reduce the communication line length. Also,
It is also highly effective in reducing communication line costs.

Of course, as shown in FIG. 2, it is also possible to adopt a connection mode in which the terminal adapter to be connected first in each row is aligned at one end, and the connection mode can be set as appropriate. (Summary of Connection Between Display Units) Furthermore, similarly for connection of each display unit 3 in the display block 10b, each display unit 3 is connected in series with the terminal adapter 2 by the second communication line L2. In particular, the display unit 3
Are arranged line by line, the second communication line L starts at the beginning of a certain M-th line when viewed from the terminal adapter 2.
The second communication line L2 is connected in series from the display unit 3 to which the second communication line L2 is connected to the adjacent display unit 3, and the display unit to which the second communication line L2 is connected at the end of the Mth line. The second communication line L2 is connected to the display unit 3 in the (M + 1) th row located on the opposite side to the display unit 3 to which the second communication line L2 is connected at the beginning of the Mth row from the third row, To the display unit 3 in which the second communication line L2 is connected to the display unit 3
Preferably, the second communication line L2 is connected in series to the display unit 3 in which the second communication line L2 is sequentially adjacent.

Of course, as shown in FIG. 2, it is also possible to adopt a connection mode in which the display units connected first in each row are aligned at one end, and the connection mode can be set as appropriate. The ID setting of the display unit 3 can be performed similarly to the terminal adapter. (Outline of Control Unit) FIG. 3 is a block diagram schematically showing the control unit 1. The control unit 1 receives a video source from the video processor 11 or a video playback device at the image input interface 11b1, and stores the image data as digital data in the image data memory 131 for each frame. The control unit 1 has a communication interface unit 11b2 connected to an external control device such as the computer 12, and the like.
Control data from an external control device is stored in the control data memory 1
32. The control unit 1 performs internal control of the control unit 1 based on the control data stored in the control data memory 132, and transmits correction data, display unit control data, and the like to the display unit 3, and a display transmitted from the display unit. It receives unit internal information and the like. The communication unit 11a configures image data and control data in a predetermined communication format and performs transmission / reception processing to / from the terminal adapter in order to communicate with the terminal adapter.

The selection circuit SEL includes an image data memory 13
1 or control data memory 132 connected to
To one of the lines B connected to the
output to a. Alternatively, control of image data input and control data input may be performed independently.

The control unit 1 has a terminal adapter ID (TAID) and a display unit ID corresponding to the image data to be displayed according to the connection form of the terminal adapter 2 and the display unit 3.
(DUID) is stored in the control data memory in advance. Further, the control unit 1 may have a configuration having a plurality of ports for performing communication with the terminal adapter 2.

The control unit 1 has a memory 132
The data related to the transmission order stored in the. In particular, the transmission order is such that, for each of a plurality of terminal adapters connected to one port of the control unit 1, all image data in the image area corresponding to the one terminal adapter need not be transmitted at one time. The image data is transmitted for each predetermined partial image data in the image area corresponding to the terminal adapter.

As a result, the terminal adapter 2
This is because there is no need to have a memory corresponding to the capacity of all image data in the image area corresponding to one terminal adapter. The terminal adapter 2 uses the second communication line L2, which is lower in speed than the first communication line L1, while the control unit 1 is transmitting data to another terminal adapter 2 connected to the same port. However, the stored predetermined part of the image data can be transferred to the display unit 2.

As described above, the control unit 1
A predetermined part of image data of an image area corresponding to the terminal adapter 2 connected to the control unit 1 is
By transmitting the data for each terminal adapter 2, the memory capacity required by the terminal adapter can be significantly reduced.

The display unit communication system and the communication method of the present invention may have a configuration having a plurality of control units 1. In this case, as shown in FIG. 4, a video processor 11 and a computer 12 are connected to each control unit 1, and each control unit 1 is provided with a control unit ID, and each control unit should supply. The image data of the image area is controlled so as to be sequentially stored at the address corresponding to the input order. (Outline of Terminal Adapter) FIG. 5 shows that the communication unit 21b to which the second communication line L2 is connected is composed of a plurality of communication units 21b.
FIG. 3 is a block diagram showing an example of a terminal adapter composed of 1, 21b2, and 21b3. The display units 3 are connected in series to the respective second communication lines L2. The communication unit 21a has two communication ports and connects between the control unit 1 and the terminal adapter 2 or between the terminal adapter 2 and the terminal adapter 2. In the example of FIG. 5, an example is shown in which the memory 23 includes the memories 231, 232, and 233 corresponding to the communication units 21 b 1, 21 b 2, and 21 b 3 of the terminal adapter 2, respectively. Communication unit 2
Common memory 2 corresponding to 1b1, 21b2, 21b3
3, the transmission of data may be controlled by a memory address control unit 22a including, for example, a direct memory access controller. In this case, a predetermined part of the image data of the image area corresponding to each line is stored in the corresponding memory 2.
31, 232, 233, or a part of image data of an image area corresponding to one terminal adapter may be stored in the common memory 23. The control unit 22 controls the internal processing of the terminal adapter 2.

That is, the total memory capacity of the memories 231, 232, 233 of the terminal adapter 2 or the memory capacity of the memory 23 is determined by the image area (first image area) transmitted from the control unit 1 and corresponding to one terminal adapter 2. ) Only needs to have at least a memory capacity corresponding to a predetermined part of image data (for example, 1 / k of the first image area, and k is an integer of 2 or more). It is not necessary to have a memory capacity corresponding to all image data in the image area.

When the terminal adapter 2 has a plurality of communication units (ports), communication control of image data is performed by attaching a port ID (PORT ID) to each communication unit. FIG. 7 shows an internal block diagram of the terminal adapter 2. The communication unit 21a of the terminal adapter 2 includes a first communication unit 21a1 and a second communication unit 21a2, and is a full-duplex bidirectional communication unit that performs bidirectional communication by two communication lines, or bidirectional by a common communication line. The first communication unit 21a1 and the second communication unit 21a2 have reception units 21a1r and 21a2r and transmission units 21a1t and 21a2t, respectively. Command data from the control unit 1 is received by one of the receiving units. For example, the first receiving unit 21a
When 1r receives the command data from the control unit 1, the 1st ACT signal becomes active, and the communication control unit selects the reception data from the first reception unit 21a1r and takes it into the reception processing unit 221 as the command data. At this time, the received data received from the second receiving unit 21a2r is transferred as it is to the first transmitting unit 21a2t without receiving the command data as command data.

Further, when the second receiving unit 21a2r is active, after receiving the command data, the response processing unit 223 sends the first transmitting unit 21a2t to the control unit 1.
The response data is transferred. The above processing is performed by the second receiving unit 2
The same processing is performed when 1a2r receives command data from the control unit. The communication control unit 222 is based on the 1st ACT signal and the 2nd ACT signal,
The selector SEL3 for selecting which receiving unit has received the command data of the control unit and selecting the receiving process, the selector SEL1 for selecting the transmitting unit for transmitting the response data from the response processing unit 223, and the selector S
Controls EL2. Thus, terminal adapter 2
The bi-directional communication control of this embodiment enables the receiving process even if command data of the control unit 1 is received from any of the first and second communication ports, and the display block 10b
Can be constructed with a more flexible system.

Next, transfer of image data and control data from the terminal adapter 2 to the display unit 3 after the reception processing will be described. Each terminal adapter 2
Can communicate with the display unit via the plurality of second communication lines L2. 5 and 6, the terminal adapter is connected to the second communication line L.
Although an example having three communication units connected to the second communication unit 2 has been described, FIG. 7 shows a configuration example having a display unit interface (display unit I / F) as N communication units. .., N indicate the number of second communication lines L2 to be connected, and control a predetermined number of display units for one line. The memories 1 to N correspond to each line and store image data to be displayed on a connected display unit. in this case,
PO for each display unit interface
Communication control is performed by attaching the RT IDs 1 to N. The terminal adapter 2 stores the image data of the predetermined part of the image data of the image area corresponding to one line in the memories 1 to N. Alternatively, a common memory having a memory capacity corresponding to a predetermined part of image data of an image area (first image area) corresponding to one terminal adapter 2 may not be allocated to each line. After receiving the image data, the display unit interfaces LINE1 to N transfer the image data to the second communication line L2 at the same time based on a predetermined synchronization signal.
The number of display units that can be controlled per line is determined by the transfer speed and the amount of image data required for the display operation of one display unit.

The terminal adapter 2 has a TAID set in advance by initial setting, stores the terminal adapter's own TAID, and selectively receives received data based on the TAID. The TAID assigned to each terminal adapter includes a TAID commonly received by all terminal adapters from the control unit 1, and is an automatic ID setting command which is command data indicating that each terminal adapter should set its own TAID. This can be done by sending data. The terminal adapter 2 that has received the automatic ID setting command data performs a predetermined operation on the data in the control data area of the received automatic ID setting command data, and sets the data resulting from the predetermined operation as its own TAID. The automatic ID setting command data is stored and transmitted to the next terminal adapter as control data using the data obtained as a result of performing the predetermined operation. For example, the control unit 1 may transmit the control data area of the automatic ID setting command data as 0 and add a predetermined calculation to 1, or may set the data in the control data area as a settable maximum value and perform the predetermined calculation. Can be subtracted by one. In this way, the TAID can be initialized under the control of the control unit in the order in which the TAIDs are connected to the first communication line L1. (Outline of Display Unit) FIG. 8 is a block diagram showing an outline of the display unit 3. The communication unit 31 has two communication ports similarly to the communication unit 21a in the terminal adapter, and performs bidirectional communication processing. In the display unit 3, image data, control data, and the like are allocated in advance to a predetermined memory space in the memory 33 according to a circuit configuration inside the display unit. The control from the control unit 1 to the display unit 3 controls the display unit 3 depending on which memory space of each display unit 3 is to be accessed, that is, which data space of the memory space is to be written or read.

When the received command data includes image data, the display unit 3 stores the image data in the memory 33, and after the reception is completed, the control unit 32 reads the image data. And common driver 3
The image data to be displayed is transferred to each line driver 341 in synchronization with the line control of 40. Common driver 3
The line control 40 drives the display element rows of each line on the display 30 by sequentially switching each common line at a predetermined cycle. At this time, data for displaying each line is allocated to the memory for each line, and the control unit 32 reads out image data corresponding to the line to be displayed from the memory 33. Further, the display unit 3 does not need to be configured by a matrix display, and can be constructed as a system that is controlled by an external control device as illumination whose illuminance can be adjusted.

FIG. 9 shows a block diagram of the communication unit 31 in the display unit 3. Terminal adapter 2
The command data composed of serial data transmitted from to to each display unit 3 is converted into parallel data in the first receiving unit 311r and input to the reception processing unit 321. The reception processing unit 321 determines whether the identification information of the input command data matches the ID stored in advance for the display unit. When the IDs match, the reception processing unit 321
The receiving process is performed based on the command data. When the reception processing unit 321 determines that an error has occurred in the input command data, the communication control unit 3 transmits response data for notifying that an error has occurred during communication of the command data.
22 to the control unit 1 via the response processing unit 323.

If the command determined by the command reception processing section 321 is a command that needs to respond to the control unit 1, response data based on the command is transmitted to the control unit 1 in the same manner. At this time, the response data is transmitted from the response processing unit to the control unit 1 by attaching the header part CRC and the data part CRC to the response data in order to determine the error in the header part and the error in the data part. Is done.

The display unit is arranged in a matrix of m rows and n columns using display elements as LEDs, for example, and has a memory for storing supplied image data to be displayed by the display unit for each row or column. N times (N) for each row or column in the order of the image data for each row or column supplied to the memory within one frame period.
Is an integer of 1 or more). The LED is repeatedly turned on, that is, displayed at N times speed. In this case, the control unit can set the transmission order of image data to be displayed by the display unit to the display unit for each row or column based on the number N of times that the display unit is repeatedly turned on and displayed within one frame period. Is preferred.

The display unit 3 has a DUID set in advance by initial setting, stores the DUID of the display unit itself, and selectively receives received data based on the DUID. The setting of DUID is
The setting can be performed in the same manner as the setting in the terminal adapter 2. (Outline of Command Control) FIG. 10 shows an example of allocation of the display control address space. From control unit 1,
When looking at the terminal adapter 2 and the display unit 3, the control memory space is represented as shown in FIG.
Transmission of desired data to the display unit to be controlled is performed by identifying which address space in the control memory space corresponds. The control address space is
TA control address space identified by TAID and PORT ID, display unit control address space identified by DUID in each terminal adapter 2, and D assigned within each display unit
It consists of a U memory map. The DU memory map differs depending on the performance and function of the display unit, such as the matrix configuration of the display unit, the gradation bit width, and the presence or absence of correction data. Therefore, the control unit 1 controls the display of the display after recognizing the type of each display unit 3 in advance.

Here, the terminal adapter ID (TA
ID) is 1 to 255, the port ID (PORT ID) is 1 to N, and the display unit (DUID) is 1 to 25.
5 are settable, for example, TAID TA0, port ID PORT ID0, and DUID DU.
0 can be set as an ID common to all terminal adapters and an ID common to all display units, respectively. The memory 33 of the display unit 3
Has been described as an example in which the address space corresponding to is composed of gradation data, surface luminance adjustment data, luminance correction data, control information, and initial setting information corresponding to image data. (Format of Command Data) FIG. 11 shows a data structure of a packet of command data transmitted from the control unit 1 to the terminal adapter 2 or the display unit 3. The command data packet is composed of a header part and a data part. The header part is
Further, an identification information area indicating a communication destination, a control type area indicating the content of control, a control start address area specifying an address to which data of the data section is to be written, a control data length area indicating a data length of the data section, and a header It consists of a header part CRC area for checking a communication error. The identification information area includes, for example, a terminal adapter ID (TAI) for designating a communication destination TA and its port.
D), a port ID (PORT ID), and a display unit ID (DUID) for specifying the display unit 3 connected to the terminal adapter. The control type area is provided with a code indicating control contents such as initial ID setting, image display control, frame synchronization control, correction data control, and management control.

The data part is composed of a control data area and a data part CRC area for checking a communication error between the data part. As the data in the data area, image data necessary for display in each display unit 3 and data such as IDs set in each terminal adapter and each display unit at the time of initial setting are attached.

The format of the command data can be set as appropriate, such as omitting a header part CRC area and a data part CRC area for checking a communication error, or inserting an end part indicating the end of data at the end of data. It is. (Format of Response Data) FIG. 12 shows a data configuration of a packet of response data transmitted from the terminal adapter 2 and the display unit 3 to the control unit 1. The response data packet also includes a header part and a data part. The header part further
Own terminal adapter ID (TAID), port I
D (PORT ID) and display unit ID (DU
ID area), a reception status / control type area indicating the reception status, a control data length area indicating the data length of the data part, and a header part CRC area for checking a communication error in the header part. The reception status / control type area is provided with a code indicating a reception status such as self-diagnosis, transmission of internal setting data, transmission of correction data, and the like. The data section includes a control data area and a data section CRC area for checking a communication error between the data section. As data in the data area, self-diagnosis data, internal setting data, correction data, and the like are added.

Also, the format of the response data can be set as appropriate, such as omitting the CRC part in the header part and the data part for checking a communication error, or inserting an end part indicating the end of the data at the end of the data. It is. (Image Display Control) Next, a method of communicating image data transmitted from the control unit 1 to each display unit will be described. When an image is switched at a video rate (for example, 60 Hz), the control unit 1 transmits a frame cycle start packet csp indicating a start of a frame cycle which is a command packet for performing frame synchronization control for every Vsync signal indicating a frame start. The data is transmitted to the display unit via the terminal adapter 2. Each display unit that has received the frame cycle start packet csp performs frame synchronization in each display unit.

After transmitting the frame cycle start packet csp,
The control unit 1 transmits an image data packet in which image data to be displayed on each display unit is attached to a data section to each display unit via the terminal adapter 2. In the communication method at this time, the control unit stores the image data corresponding to the image area to be supplied,
A part of the image data to be displayed by the first image area composed of the display unit connected to one terminal adapter by the second communication line is sequentially transferred to all terminal adapters for each terminal adapter. And a second communication step in which the control unit repeats the first communication step until all of the image data to be displayed in the respective first image areas is supplied. And a third communication step in which the terminal adapter supplies the image data stored in the first communication step to the display unit to be transferred within one cycle time of the first communication step. Each terminal adapter that has received the image data packet has a TAID in the identification information.
Is compared with its own terminal adapter ID (TAID), and if they match, the image data packet is stored in the memory 23. Further, the terminal adapter 2 receiving the image data packet transfers the image data packet stored in the memory to each display unit 3 connected to each terminal adapter 2. Then, each display unit 3 that has received the image data packet,
DUID in identification information and own display unit I
D (DUID) is collated, and if they match, reception processing is performed.

The image data transmitted to each display unit 3 is stored in a memory 33 in each display unit 3.
And display control. As described above, each display unit performs image display based on the image data distributed by the control unit 1,
An image can be displayed on the entire display 10. (Management system) Further, each display unit 3
To the control unit 1 by providing functions such as driver abnormality, disconnection and other abnormalities, communication abnormalities, and temperature monitoring, and by providing data relating to each function to the control unit 1 as response data. The control and monitoring of each display unit can be performed through the information processing device connected to the computer.

For example, constant current output abnormality, driver IC
Various fault information such as abnormal internal temperature of the
Alternatively, internal setting information such as register information of the control unit of the display unit 3 or the display unit 3
Each of the display units 3 and terminals is controlled by the computer 11 or the like connected to the control unit 1 based on temperature monitoring information indicating the temperature of the internal drive board surface or the like or power supply monitoring information for monitoring the voltage of the power supply to the display unit 3. Control and monitoring of the adapter 2 or power supply can be performed.

[0053]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a display unit communication system according to the present invention, an asynchronous communication system (AT
An embodiment using M) will be described. In this embodiment, communication on the first communication line between the terminal adapters is performed at a higher speed than communication on the second communication line between the display units. here,
An example in which an LED display unit is used as the display unit 3 and serial communication is used for each communication will be described.

The first communication line L1 uses a high-speed transmission cable to perform broadband communication between terminal adapters, and the second communication line L2 between display units in each display block uses a low-speed transmission cable. As a result, long-distance transmission between terminal adapters can be performed without increasing costs, and each display block can be flexibly connected. (Control Unit) As shown in FIG. 13, the control unit 1 includes a control unit 12a for receiving image data from the video processor 11, a communication terminal 1a including an image data memory 131 for storing the received image data, and a computer. A control unit 12b that controls the reception of data from the device 12, the transmission of image data, and the like;
A memory 132b composed of a non-volatile memory for storing data relating to the transmission order of the image data stored in the image data memory 131, and a memory 131a composed of an SRAM or the like for copying the data stored in the non-volatile memory 132b at power-on or the like And a control board 1b. The control board 1b preferably further includes an RGB counter 14 for setting a counter value indicating RGB for each of RGB in accordance with the read address. The control unit 12a writes the image data of the area for which the control unit 1 is in charge of the display in the image data memory 131 among the received data. The control unit 12b communicates with the computer 12, and writes data related to the address into the memory 132. The computer 12 calculates the relationship between the coordinates and the address in the area where the control unit 1 is in charge of the display. Further, the control unit 1 may have a configuration having a plurality of ports for performing communication with the terminal adapter 2.

In the display unit communication system according to the embodiment of the present invention, the display displays the entire screen in finely divided units, and transmits data for each unit. Therefore, the order of data transmitted from the control unit is different from the order when data is externally written to control unit 1. This transmission order depends on the duty ratio, the unit configuration, the configuration of the image area corresponding to one terminal adapter, the number of ports of the terminal adapter (TA), and the like. These pieces of information are input in the computer 12, and the order of data transmission and the area corresponding to the image data of the entire screen are calculated in advance. The correspondence information obtained by this calculation is stored in the memory 132b from the computer via the control unit 11a of the control unit 1.

When the power is turned on, the control unit 1 copies the data relating to the transmission order stored in the memory 132b to the memory 132a and stores it. In particular, the transmission order is such that, for each of a plurality of terminal adapters connected to one port of the control unit 1, all image data in the image area corresponding to the one terminal adapter need not be transmitted at one time. It is preferable that the image data is transmitted for each predetermined partial image data in the image area corresponding to the terminal adapter. This is because the terminal adapter 2 does not need to have a memory corresponding to the capacity of all image data in the image area corresponding to one terminal adapter. Terminal adapter 2
Is a case where the control unit 1 uses the second communication line L2 which is lower in speed than the first communication line L1 while transmitting data to another terminal adapter 2 connected to the same port. Also, the stored predetermined part of the image data can be transferred to the display unit 2. Thus, the control unit 1 is connected to the terminal adapter 2 connected to the control unit 1.
By transmitting the predetermined part of the image data of the image area corresponding to each of the terminal adapters 2 to each terminal adapter 2, it is possible to greatly reduce the memory capacity required by the terminal adapter.

The control unit 1 receives a video source from a video processor or a video playback device, and stores the image data in the image data memory 131 as digital data for each frame. Control unit 1
Represents the image data stored in the image data memory 131,
For each predetermined part of image data in the image area corresponding to one terminal adapter, the display unit 3 converts the image data into a packet format of data strobe type ATM communication based on the transmission order copied to the memory 132a. , As image data packets. (Terminal Adapter) The terminal adapter 2 displays a communication unit 21a for communicating with the control unit 1 or another terminal adapter, a communication unit 21b for communicating with the display unit 3, and a first image area for storing data and the like communicated. A memory 23 having a memory capacity corresponding to a part of the image data to be formed, and a control unit 22 for performing writing and reading of the memory 23 and internal control.
The terminal adapter 2 has a TAI
D is set and the terminal adapter's own TAID
, And selectively receives the received data based on the TAID. Then, the received data is transferred to the connected display unit 3. If the terminal adapter 2 has a plurality of display unit interfaces, it determines which display unit interface to transfer the received data, and transfers the data. (LED Display Unit) FIG. 14 is a block diagram schematically showing an LED display unit. The communication unit 31 has two communication ports similarly to the communication unit 21a in the terminal adapter, and performs bidirectional communication processing.

In the display unit 3, image data, brightness correction data, control data, and the like are allocated in advance to a predetermined memory space in the memory 33 in accordance with the circuit configuration inside the display unit. Control from the control unit 1 to the display unit 3 is as follows:
The display unit 3 is controlled depending on which memory space of each display unit 3 is to be accessed, that is, which memory space data area is to be written or read.

The command data received by the communication unit 31 of the display unit 3 is the DU of the command data.
When the ID matches the DUID stored therein, the control data is written to the memory area specified by the control address and the control data length.

When the command data includes image data, the image data for one image frame is stored in the memory,
After the reception is completed, the control unit reads the image data. Then, the image data to be displayed is transferred to the LED driver 341 in synchronization with the line control of the common driver 340. In the line control of the common driver, the LEDs of each line are driven by sequentially switching each common line at a predetermined cycle. At this time, the data for displaying each line is allocated to the memory for each line,
The control unit 32 reads out image data corresponding to the line to be displayed from the memory 33.

By driving each pixel in this manner, an image is displayed on the matrix display 30 of the display unit 3. In this embodiment,
As an example of the LED display 30, an example has been described in which a pixel constituted by a plurality of LEDs corresponding to RGB is driven by one common driver and four LED drivers.

In this embodiment, the memory 33 in the LED display unit 3 has two memory areas 33.
1 and 332. These two memory areas may be constituted by two SRAMs, for example. In the memory, image data to be displayed is alternately stored in one of the memory areas for each frame. As shown in FIG. 15, each memory area is a memory area com adr in which image data corresponding to a common address is stored.
It consists of 0, 1, 2, and 3. While an image based on the image data stored in one memory area is displayed on the LED display unit 3 for one frame period,
Image data to be displayed in the next frame cycle time is received and stored as command data in the other memory area. Also, its own TAID, each LE
A memory such as an EEPROM for storing the D luminance correction data and the like may be further provided.

The LED display unit 3 has, for example, a memory in which LEDs are arranged in a matrix of m rows and n columns, and stores the supplied image data to be displayed by the display unit for each row or column.
The LED is turned on and displayed N times (N is an integer of 1 or more) for each row or column in the order of the image data for each row or column supplied to the memory within one frame period, that is, N times speed display is performed. Is preferred. At this time, the display order of the rows or columns corresponding to the double-speed display times N may be set in the LED display unit 3 in advance, or may be set by the control unit 1. (Outline of Command Control) When the terminal adapter 2 and the display unit 3 are viewed from the control unit 1, transmission of desired data to the display unit to be controlled is performed by identifying an address space in the control memory space. Done by The control address space is a TA control address space identified by TAID,
Each terminal adapter 2 includes a display unit control address space identified by a DUID and a DU memory map allocated in each display unit. The DU memory map differs depending on the performance and functions of the display unit, such as the matrix configuration of the display unit, the gradation bit width, and the presence or absence of luminance correction data. Therefore, the control unit 1 controls the display of the display after recognizing the type of each display unit 3 in advance. (Image Display Control of Display Unit) FIG. 16 shows an example of communication of image data in one frame and display timing in the display unit in the display communication system of the present invention. Here, for the sake of simplicity, one control unit with one port, one terminal adapter with one port, and j LED display units connected to each terminal adapter (total i × j) LED display unit)
The following describes an example of a display communication system including.

The control unit 1 is a command packet for performing frame synchronization control for each Vsync indicating a one-frame synchronization signal supplied from the video processor 11 when an image is switched at a video rate (for example, 60 Hz). A frame cycle start packet csp indicating the start of the frame cycle is transmitted to all display units. Subsequently, an image data packet, which is command data in which image data to be displayed in each display unit is attached to a data portion, is connected to the display unit DU1 connected to each terminal adapter TA1 to TAi, and to each terminal adapter TA1 to TAi. Display unit DU2, display units DU3 connected to terminal adapters TA1 to TAi,..., Display unit D connected to terminal adapters TA1 to TAi
Image data packets corresponding to Uj are sequentially transmitted within one frame period. Here, each image data packet transmitted from the control unit 1 is provided with identification information according to the connection form of the terminal adapter 2 and the display unit 3.

That is, in this example, the control unit sequentially transmits image data packets corresponding to image data of one display unit 3 to each terminal adapter 2. The control unit 1 has a DUID connected to each terminal adapter 2 with TAID = 1 to TAID = i during the period T1.
= 1 is transmitted to the display unit, and this is repeated j times. Terminal adapter 2
Within time T1, for example, at time T3 (T3 ≦ T1), the image data DUp (p
= 1, 2, 3,. . . , J) to the display unit to be transferred.

Each display unit 3 receiving the frame cycle start packet csp performs frame synchronization. Next, each display unit 3 receiving the image data packet transmits the identification information and its own display unit ID.
(DUID), and if they match, reception processing is performed. The image data received by each display unit is stored in the memory 33 of each display unit 3.
Are stored in one of the memories 331 and 332, and the display is controlled in the next frame cycle.

When the display units DU1 to DUj connected to each terminal adapter receive the frame cycle start packet csp, the display unit 3
, The frame synchronization signal Vsync rises. In response to the rise of the frame synchronization signal Vsync, a blank signal blank corresponding to the lighting cycle of each line of the matrix display 30 is generated. Blank signal blank
Accordingly, based on each data of the addresses com adr 0, 1, 2, and 3 in the memory stored in the previous frame period, the lighting of each LED is controlled by the common driver 340 and the corresponding LED driver 341. Is displayed. Here, each pixel is driven at a 1/4 duty (for example, 4 rows), and one frame period is divided into 1/2 frame periods, and the same image is displayed in each 1/2 frame period. The example of the double speed lighting control performed is shown. By this double-speed lighting, flickering of an image can be prevented.

At this time, the driving order (display order) of the driving row or column by the common driver is the set double speed display number N
However, the reading order of the memories 331 and 332 in the LED display unit 3 is constant, and the writing order of the image data in the memories 331 and 332 according to the number of times of display N depends on the transmission order of the control unit 1. Is set.

The reset gap is inserted for the purpose of providing a non-transfer section for a predetermined time between the frame cycle start packet csp, the image data packet and each image data packet, and securing the transfer time of the terminal adapter 2 to the display unit. .

FIG. 17 shows an example of the structure of data relating to the transmission order in the control unit 1. In the memory 132a, addresses in the image data memory 131 to be read in correspondence with the transmission order are sequentially stored.
In the example of FIG. 17, the address Addr in the memory 131a is
Address data Address Data1 corresponding to ess2 is read, and RGB counted according to the read timing.
The counter RGB Counter is added to the last digit of the address data Address Data1 to make a read address Read Address. Based on the read address Address, the control unit 1 reads out the image data from the image data memory 131a and sends it to the first communication line L1.

The example shown in FIG. 17 will be described more specifically. Address data "0000000000000000" corresponding to the address 0000 (h) in the memory 131a is read, and R
Is added to the last digit of the RGB counter "01" to generate a read address "Read Address" 000000000000000000 ",
Read address "000000000000000000"
Is read out from the image data RDATA stored in "00001 (h)" of the image data memory 131a corresponding to. Next, an RGB counter “10” corresponding to G is similarly added to the last digit to generate a read address Read Address “000000000000000010”, and the read address Read Address “000000000000000”
"00002 (h)" of the image data memory 131a corresponding to "010"
Is read out. Then, an RGB counter "10" corresponding to B is similarly added to the last digit, and a read address "000000000000000011" is read.
And its read address Read Address "000000000
“0000011” corresponding to “0000011” in the image data memory 131a.
03 (h) "is read out.
Further, the address “0001” in the next memory 131a
Address data “0000000000000001” corresponding to “(h)” is read out, and similarly, the corresponding RGB image data is sequentially read out.

In the example shown in FIG.
Address data “0000 (h)” to “000F (h)” at address “a” are continuously output from address data “0000000000000000” to “000000000”.
Although "0001111" corresponds, "0000000010100000" is stored in the next address "0010 (h)". In this way, the order of data transmitted from the control unit is externally written to the control unit. In this case, it is understood that the control is performed in a manner different from the order when the image data is transmitted, in which case the image data of the transmission order “0010 (h)” is “00281 (h)” and “00282 (h) in the image data memory 131a. ) ",
The image data stored in “00283 (h)” is transmitted.

As described above, when a part of the read address Address is configured to be generated by using a counter corresponding to RGB, the amount of data related to the transmission order to be stored is preferably reduced. (Calculation of Transmission Order) An example of a method of calculating the transmission order performed by the computer 12 or the like will be described below. In this example, the port ID corresponding to the port in the control unit 1, the TA ID corresponding to the terminal adapter, the TA port ID corresponding to the port of the terminal adapter, and the DU I corresponding to the display unit
When D and a pixel (for example, a column) Upix and a common (for example, a row) Ucom are specified, the address of the pixel (pixel) PX is obtained. Here, variables are defined as follows. Fn: Number of pixels per line in the image area to be supplied by the control unit Fpix, Fcom: Pixel and common number when the image area to be supplied by the control unit is viewed as one divided display device FPpix, FPcom: Fport block Pixel and common number when viewing as one split display device TApix, TAcom: Pixel and common number when viewing TA block as one split display device TPpix, TPcom: TA port block with one split display device Pixels and common numbers when viewed Upix, Ucom [x]: Pixels in the display unit and commons where data is sent out x-th in that unit fpx, fpy: Coordinates in the image area to be supplied by the control unit of the Fport block Value tax, tay: coordinate value of TA block in Fport block tpx, tpy: coordinate value of TA port block in TA block ux, uy: display unit TA port
Coordinate values in block FPn, FPm: Number of Fport blocks constituting the image area to be supplied by the control unit in the x and y directions TAn, TAm: Number of TA blocks constituting the Fport block
Number of x direction and y direction TPn, TPm: TA port block which constitutes TA block
Un, Um: Number of display units constituting the TA port block in the y direction n, m: Total number of pixels and commons of the display unit First, from DUID, TA port bl of the display unit
Finds the coordinates in the ock, and based on the coordinate information, PX calculates TA p
Calculate the pixel number and common in the ort block.

TPpix = Upix + (ux-1) × n TPcom = Ucom [x] + (uy-1) × m Next, from the coordinates of the TA port block in the TA block, P
Calculate the pixel number and common X in TA block.

TApix = TPpix + (tpx-1) × Un × n TAcom = TPcom + (tpy-1) × Um × m Next, PX is calculated from the coordinates of the TA block in the Fport block.
Calculates the number of the pixel and common in the Fport block.

FPpix = TApix + (tax-1) × TPn × Un × n FPcom = TAcom + (tay-1) × TPm × Um × m Next, from the coordinates in the entire image area of the Fport block, P
Calculate the number of pixels and common X is in the whole image area.

Fpix = FPpix + (fpx-1) × TAn × TPn × Un × n Fcom = FPcom + (fpy-1) × TAm × TPm × Um × m Then, the numbers from the upper left in the entire PX image area are obtained.

Calculation of Px = Fpix + (Fcom-1) × Fn Duty Ratio The order of commons to which data is sent is as follows according to the duty ratio of the connected unit. Ucom [1] = 1 ・ ・ ・ Ucom [x] = (Ucom [x-1] + duty)% m + int ((Ucom [x-1] + dut
y) / m) ... Ucom [m] = m (% is a remainder operator) Here, variables are defined as follows. Ucom [x]: Common number for transferring data x-th within the unit duty: Reciprocal of the duty ratio of the unit (1, 2, 4, 8, ...) m: Number of commons of the unit Using these formulas, variables The control unit port ID (FPID), Upix, x, terminal adapter port ID (TPID), terminal adapter ID (TA ID), and display unit ID (DUID) are incremented from 1 to the maximum value max. Perform calculations in the order of the variables. As described above, it is preferable that the control unit 1 sets the transmission order of the image data according to the duty ratio of the LED display unit.

[0079]

As described above, according to the present invention, it is possible to provide a display unit communication system and a communication method thereof that can flexibly cope with an application and improve communication efficiency. Such communication efficiency can significantly reduce the memory capacity required by the terminal adapter, and is particularly effective for a low-cost, high-definition, large-size display unit communication system.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a display unit communication system according to the present invention.

FIG. 2 is a schematic diagram of a display unit communication system according to the present invention.

FIG. 3 is a block diagram schematically showing a control unit according to the present invention.

FIG. 4 is a schematic diagram of a display communication system using a plurality of control units according to the present invention.

FIG. 5 is a block diagram schematically showing a terminal adapter according to the present invention.

FIG. 6 is a block diagram schematically showing a terminal adapter according to the present invention.

FIG. 7 is a communication section 2 of the terminal adapter according to the present invention.
It is a block diagram which shows the outline of 1a.

FIG. 8 is a block diagram schematically showing a display unit according to the present invention.

FIG. 9 is a block diagram schematically showing a communication unit 31 of the display unit according to the present invention.

FIG. 10 is a display unit control address space in the display unit communication system according to the present invention.

FIG. 11 is a schematic diagram showing a data configuration of a command data packet in the present invention.

FIG. 12 is a schematic diagram showing a data configuration of a response data packet in the present invention.

FIG. 13 is a block diagram schematically illustrating a control unit according to an embodiment of the present invention.

FIG. 14 is a block diagram schematically showing an LED display unit according to the present invention.

FIG. 15 is a schematic diagram showing a memory area in a memory space of a memory 33 of the LED display unit according to the present invention.

FIG. 16 is a timing chart showing image display control in the LED display unit system of the present invention.

FIG. 17 shows an example of a data configuration relating to a transmission order in the control unit 1.

FIG. 18 is a schematic diagram of a conventional display unit communication system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Control unit 2 ... Terminal adapter 3 ... Display unit 10 ... Display 10a ... Display area 10b ... Display block L1, L2 ... Communication line 11 ... Computer 12. ..Video processors 11a, 21a, b, 31 ... communication unit 12, a, b, 22, 32 ... control unit 131, a, b, 132, 23, 33 ... memory 30 ... matrix Display 340: Common driver 341: Line driver, LED driver 801: LED display device 802: LED unit 803: Controller 804: Distributor 805: Drive driver 810: Video data 820: Control data

Claims (10)

[Claims] A plurality of display units for driving one or more display elements based on the supplied image data; at least one control unit for supplying image data to be displayed by the display unit; and the control unit. A first communication line connected to the display unit and a second communication line;
And a plurality of terminal adapters connected to the display unit for storing image data to be displayed by the display unit supplied from the control unit and transferring the stored image data to the display unit. A communication method in a system, wherein the control unit stores image data corresponding to an image area to be supplied and a first image formed by a display unit connected to one terminal adapter by a second communication line. A first communication step of sequentially transmitting a part of image data to be displayed in the area to all terminal adapters for each terminal adapter by a first communication line; Picture Communication method characterized in that all the image data to be displayed area is composed of, a second communication step of performing repeatedly the first communication step to be supplied. 2. The method according to claim 1, wherein the terminal adapter supplies the image data stored in the first communication step to the display unit to be transferred within one cycle time of the first communication step. The communication method according to claim 1, further comprising a step. 3. The display unit communication system according to claim 1, wherein the display elements are LEDs arranged in a matrix of m rows and n columns, and the supplied image data to be displayed by the display unit is stored in a row or a column. And the display unit for lighting and displaying the LED repeatedly N times (N is an integer of 1 or more) for each row or column in the order of the image data for each row or column supplied to the memory within one frame period. The control unit can set the transmission order of image data to be displayed by the display unit to the display unit for each row or column based on the number N of times that the display unit is repeatedly turned on and displayed within one frame period. The communication method according to claim 1, wherein: 4. The communication method according to claim 1, wherein communication performed on the first communication line is faster than communication performed on the second communication line. A plurality of display units for driving one or more LEDs based on the supplied image data; at least one control unit for supplying image data to be displayed by the display unit; A communication line, and the display unit and the second
And a plurality of terminal adapters connected by the communication line for storing image data to be displayed by the display unit supplied from the control unit and transferring the stored image data to the display unit. In the system, the control unit stores image data corresponding to an image area to be supplied, and displays a first image area including a display unit connected to one terminal adapter by a second communication line. A part of the image data to be transmitted is sequentially transmitted to all the terminal adapters for each terminal adapter by the first communication line in the first cycle, and the first image area is displayed in the first image area. Until everything is supplied Display unit communication system to which the first image area and performing repeatedly a part of the transmission of the image data to be displayed. 6. The apparatus according to claim 1, wherein said terminal adapter supplies the image data stored by said terminal adapter to a display unit to be transferred within one cycle time corresponding to said first cycle time. 6. The display unit communication system according to 5. 7. A display unit communication system, wherein the display unit is arranged in a matrix of m rows and n columns using the display elements as LEDs, and supplies supplied image data to be displayed by the display unit for each row or column. And the LED is lit and displayed repeatedly N times (N is an integer of 1 or more) for each row or column in the order of the image data for each row or column supplied to the memory within one frame period. The display unit, wherein the control unit is configured to, based on the number N of times that the display unit is repeatedly turned on and displayed within one frame period, transmit the image data to be displayed by the display unit to the display unit for each row or column. 7. The data according to claim 5, wherein the data can be set. Spray unit communication system 8. The control unit includes: an image data memory for sequentially storing image data to be supplied from the video source to be supplied by the control unit at an address corresponding to an input order; and the first image area is to be displayed. Part of the image data,
A part of the image data to be transmitted to all the terminal adapters for each terminal adapter and to be displayed in the first image area until all of the image data to be displayed in the first image area is supplied. To repeatedly perform the transmission, an address memory storing the transmission order of the address corresponding to the image data to be transmitted, based on the transmission order stored in the address memory,
8. A control unit for reading image data of a corresponding address from the image data memory and transmitting a part of image data to be displayed by the first image area to the terminal adapter. The image display system according to 1. 9. The control unit further comprises R,
An RGB counter for distinguishing data of each of G and B, wherein the control unit converts image data of a corresponding address from the image data memory based on the transmission order and the RGB counter stored in the address memory. reading,
The image display system according to claim 8, wherein a part of the image data to be displayed by the first image area is transmitted to the terminal adapter. 10. The display unit communication system according to claim 5, wherein the communication performed on the first communication line is faster than the communication performed on the second communication line.