JP2004145321A - Communication control device and its driving method, led display unit, and building equipped with led display unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication control device capable of enabling an LED display unit display switching device etc. to securely recover from communication trouble. <P>SOLUTION: This communication control device which makes a controller supplying a control signal for a unit and the unit to communicate data to each other has a communication state information storage device capable of judging a communication trouble state and storing communication trouble state information once detecting a break of a vertical synchronizing signal, inputted in fixed cycles to communication devices provided to the unit and controller, for longer a fixed period (T1). <P>COPYRIGHT: (C)2004,JPO

Description

INDUSTRIAL APPLICABILITY The present invention relates to a communication device having a communication unit, and can be applied to an LED display or the like by LED drive communication control, and particularly to a communication such as an LED display unit display switching device in a vertical synchronization signal or a horizontal synchronization signal. The present invention is applicable to providing a communication control device that can reliably recover from a failure.

In recent years, high-performance red, green and blue LEDs have been developed, and full-color LED display has become possible. Among large-sized display devices, LED display devices that utilize the features 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.

The display in which such an LED is used, from a large-sized outdoor display such as for a billboard, to a medium-sized or small-sized screen in a semi-indoor such as a platform, has a screen size of an LED display according to an application and location, and Displays having various 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.

In such a display, LEDs of, for example, about 16 dots × 16 dots are arranged in a matrix, and these are modularized as one LED unit, and the LED units are arranged according to the screen size and the vertical / horizontal aspect ratio. It is configured by being connected in a matrix.
FIG. 5 shows an LED display 801 as a configuration example. A plurality of distributors 804 connected to the controller 803 are provided for each row of the LED units 802 and supply video data for display and various control signals to the LED units 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, a video data latch signal, and the like. The power is supplied to each LED unit 802 via 804. The display full-color video data 810 transmitted from the distributor 804 to each LED unit 802 requires at least video data of each color of RGB (red, green, blue), and the bit width of the video data is determined according to the gradation resolution.

For example, in the case of 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, the data is latched when a predetermined number of data is supplied, and the captured video data 810 is displayed as the display video data 810. it can.

WO ¥ 02/03365

However, such an LED display device transmits the display video data 810 between the controller 803, the distributor 804, and the LED unit 802 via a parallel bus as a signal interface, and supplies a synchronous clock and various control signals 820 synchronized therewith. I have. 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, when the display screen is large and the number of LED units tends to increase, if the number of signal lines increases and becomes longer, deterioration of the pulse width of the reference signal for gradation, the synchronizing clock of video data, and noise will cause a serious problem. Become.

First of all, if the content of the received data is incorrect, the transmission circuit and the reception circuit in the communication unit do not operate normally and communication cannot be performed, and once a communication failure state occurs, recovery may be difficult. there were. For example, when the data length A is specified in the received data, the data length usually matches the actually transmitted data length B, but if A is larger than B for some reason, the received data is transmitted as it is. Even in this case, the data length A to be transmitted becomes longer than the data length B to be actually transmitted. Normally, when A and B match, the transmission is terminated. In this case, the transmission cannot be terminated forever. The same data is repeatedly output, and it becomes difficult to recover to the normal operation. In addition, power supply fluctuations, poor contact of communication lines, insertion and removal of communication lines during communication (hot insertion and removal), etc., may affect the operation of the receiving and transmitting circuits, resulting in communication failures. A solution was needed. Secondly, if there is a poor connection in the communication line, etc., the communication status changes every moment depending on the contact status, so it is necessary to keep the communication status that occurred in the past, but grasp the past communication status. Since no means for taking action has been taken, the past state of the communication failure history and the like was unknown.

In view of the above problems, it is an object of the present invention to provide a communication circuit that can reset (initialize) a communication circuit and quickly restore a normal operation state after recognizing a communication failure state. By storing the past and present communication failure state in the storage device and making it possible to read it out from the outside, it is possible to grasp the communication failure state and to consider countermeasures. It is an object to provide a communication device. In addition, it is intended to improve the reliability of communication circuits and the like in a comprehensive manner.

In a building equipped with a conventional LED display, typically a building such as a building or an advertising board, noise is generated due to the effect of an increase in the size of the screen and an increase in the number of display wires, and unnecessary radio waves are generated around the building. It diffuses and reflects, which not only causes noise and malfunctions for TVs and radios and other electrical products inside and outside the building, but also increases the wiring of the LED display and causes other radio waves In addition to deteriorating the display quality of the LED display itself due to the effect of reacting (pickup) to the display and the like, the support frame and the support structure become stiff and heavy due to the increase in the weight of the display including the wiring. The load on itself has also increased, which has caused various undesired items, such as an increase in the life of the building and an increase in the cost for making it robust.

According to a first aspect of the present invention, there is provided a communication control apparatus having communication means for communicating data between a controller for supplying a control signal for the display unit and the display unit and / or between the display units. A counter circuit in which the count value is initialized by a signal (V) input at a constant period; a counter value counted by the counter circuit and a preset comparison value (M); This communication control device has a comparison circuit that detects the coincidence of the count values and determines that a communication failure has occurred. As a result, the communication failure state can be reliably determined and recognized with good reproducibility, and the communication failure determination criterion corresponding to various communication situations, unit display methods, and the number of connection stages can be set by appropriately setting the comparison value. can do.

According to a second aspect of the present invention, there is provided a communication control device having communication means for communicating data between a controller for supplying a control signal for the display unit and the display unit or / and between the display units. This communication control device has a first detection means for detecting a predetermined period (T1) from a signal (V) input at a constant period and determining a communication failure state. As a result, it is possible to determine that a communication failure has occurred when a predetermined signal (V) cannot be input and received periodically, and the time (T1) for determining the communication failure state can be set to an optimal value for the communication system.

According to a third aspect of the present invention, there is provided a communication control device having a communication state information storage unit for storing a communication failure state.
According to a fourth aspect of the present invention, there is provided the communication control device, wherein the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.

According to a fifth aspect of the present invention, there is provided a communication control device having communication means for communicating data between a controller for supplying a control signal for the display unit and the display unit and / or between the display units. A counter circuit in which a count value is initialized by a signal (V) inputted at a constant period, a count value counted by the counter circuit is compared with a preset first comparison value, and a first comparison value And a first comparison circuit that detects a match between the count value and the count value and determines a communication failure state;
The count value counted by the counter circuit initialized by the detection signal for determining the communication failure state is compared with a preset second comparison value, and the coincidence between the second comparison value and the count value is detected to perform communication. A communication control device having a second comparison circuit for outputting a signal for resetting the means.
With this configuration, the communication failure state can be reliably detected, and the communication failure state can be determined with good reproducibility based on the count time from the signal (V). Further, after determining the communication failure state, the second comparison circuit initializes (resets) the communication means each time the second comparison value detects the second comparison value. After the completion of the communication, the communication means is reset any number of times until the restoration is confirmed, and the communication means can prepare for the input of the signal (V), thereby enabling the normal operation state to be quickly restored.

According to a sixth aspect of the present invention, there is provided a communication control device having communication means for communicating data between a controller for supplying a control signal for the display unit and the display unit and / or between the display units. First detecting means for detecting a predetermined period (T1) from a signal (V) input at a constant period and determining a communication failure state, and a predetermined period (T2) from a detection signal determining a communication failure state. ), And a communication control device having at least a second detecting means for outputting a signal for resetting the receiving means and the transmitting means of the communication means.
According to the present invention, the transmission control device of the display unit can detect the interruption time (T1) of the input signal and reset the transmission / reception device after the time (T2).

According to a seventh aspect of the present invention, there is provided a communication control device having a communication state information storage unit for storing a communication failure state.
The invention according to claim 8 is a communication control device in which the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.
According to a ninth aspect of the present invention, the communication state information storage unit that stores the communication failure state is a storage unit that erases the storage of the communication failure state when the first signal is input from the communication unit. This is a communication control device that is a communication means that allows the first signal to be input at any time.

According to a tenth aspect of the present invention, there is provided an LED display having communication means for communicating data between a controller for supplying a control signal for the display unit and the display unit or / and between the display units. A counter circuit whose count value is initialized by a signal (V) input at a constant period; a counter value counted by the counter circuit is compared with a comparison value (M) input in advance; This is an LED display that has a comparison circuit that detects the coincidence of the count values and determines that a communication failure has occurred. According to the present invention, it is possible to provide an LED display in which a signal (V) input at a fixed cycle can be determined as a communication failure state including a discontinuous counter circuit and a comparison circuit. In addition, it is possible to detect and recover only communication errors that cause problems in appearance.

An invention according to claim 11 is an LED display having communication means for communicating data between a controller for supplying a control signal for the display unit and the display unit or / and between the display units. This LED display has a first detection means that detects a predetermined period (T1) from a signal (V) input at a constant period and determines that there is a communication failure state.
According to a twelfth aspect of the present invention, there is provided an LED display having communication status information storage means for storing a communication failure status.

The invention according to claim 13 is an LED display in which the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.
According to a fourteenth aspect of the present invention, in the LED display having communication means for communicating data between a controller that supplies a control signal for the display unit and the display unit or / and between the display units, A counter circuit in which the count value is initialized by a signal (V) input at a constant period; a counter value counted by the counter circuit and a first comparison value set in advance; A first comparison circuit that detects coincidence of the count values and determines a communication failure state; a count value that is counted by a counter circuit initialized by a detection signal that determines a communication failure state; and a second comparison value set in advance And a second comparison circuit for detecting a match between the second comparison value and the count value and outputting a signal for resetting the communication means. It is.

According to a fifteenth aspect of the present invention, there is provided an LED display having communication means for communicating data between a controller for supplying a control signal for the display unit and the display unit and / or between the display units. First detecting means for detecting a predetermined period (T1) from a signal (V) input at a constant period and determining a communication failure state, and a predetermined period (T2) from a detection signal determining a communication failure state. ) Is an LED display having at least a communication means and a second detection means for outputting a signal for resetting the reception means and the transmission means.
The invention according to claim 16 is an LED display having communication status information storage means for storing a communication failure status.

The invention according to claim 17 is an LED display in which the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.
The communication state information storage means for storing the communication failure state is a storage means for deleting the storage of the communication failure state when the first signal is input from the communication means, An LED display that is a communication means that allows the first signal to be input at any time.

The communication control device according to claim 19, further comprising a communication unit configured to communicate data between a controller that supplies a control signal of the display unit and the distribution board and / or between the display unit and the distribution board. A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant period; a counter value counted by the counter circuit and a comparison value (M) input in advance; M) and a comparison circuit that detects a match between the count value and a communication circuit that determines a communication failure state.
According to a twentieth aspect of the present invention, in a communication control device having communication means for communicating data between a controller that supplies a control signal for a display unit and a distribution board or / and between a display unit and a distribution board, A communication control device having first detection means for detecting a predetermined fixed time period (T1) from a signal (V) input to the communication means at a fixed cycle and determining a communication failure state.

According to a twenty-first aspect of the present invention, there is provided a communication control device having a communication state information storage unit for storing a communication failure state.
The invention according to claim 22 is a signal control device in which the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.
According to a twenty-third aspect of the present invention, there is provided a communication control device having communication means for communicating data between a controller that supplies a control signal for a display unit and a distribution board and / or between a display unit and a distribution board. A counter circuit in which a count value is initialized by a signal (V) input to the means at a constant period, a count value counted by the counter circuit and a first comparison value set in advance and a first comparison A first comparison circuit that detects a match between the value and the count value to determine a communication failure state, and a count value that is counted by a counter circuit initialized by a detection signal that determines a communication failure state and a second predetermined value. A second comparison circuit for comparing the comparison value and detecting a match between the second comparison value and the count value and outputting a signal for resetting the communication means. This is a control apparatus.

According to a twenty-fourth aspect of the present invention, in the communication control device having communication means for communicating data between a controller that supplies a control signal for the display unit and the distribution board and / or between the display unit and the distribution board, A first detecting means for detecting a predetermined period (T1) from a signal (V) inputted to the communication means at a constant period to determine a communication failure state; A communication control device that detects a period (T2) and has at least a second detection unit that outputs a signal for resetting the reception unit and the transmission unit of the communication unit.
An invention according to claim 25 is a communication control device having communication state information storage means for storing a communication failure state.

The invention according to claim 26 is the communication control device, wherein the signal (V) input at a constant cycle is a vertical and / or horizontal synchronization signal.
The communication state information storage means storing the communication failure state is a storage means for deleting the storage of the communication failure state when the first signal is input from the communication means, This is a communication control device that is a communication means that allows the first signal to be input at any time.

According to a twenty-eighth aspect of the present invention, there is provided an LED display having communication means for communicating data between a controller for supplying a control signal for a display unit and a distribution board and / or between the display unit and the distribution board. A counter circuit whose count value is initialized by a signal (V) input to the means at a constant period; a count value counted by the counter circuit; and a comparison value (M) input in advance and a comparison value (M). ) And a comparison circuit that detects the coincidence of the count value and judges the communication failure state.

The invention according to claim 29 is an LED display having communication means for communicating data between a controller that supplies a control signal for a display unit and a distribution board or / and between a display unit and a distribution board. This is an LED display that has a first detection unit that detects a predetermined period (T1) from a signal (V) input to the communication unit at a constant period and determines that there is a communication failure state.
The invention according to claim 30 is an LED display having communication state information storage means for storing a communication failure state.

The invention according to claim 31 is an LED display in which the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.
32. An LED display having communication means for communicating data between a controller for supplying a control signal for a display unit and a distribution board and / or between a display unit and a distribution board. A counter circuit in which a count value is initialized by a signal (V) input to the means at a constant period, a count value counted by the counter circuit and a first comparison value set in advance and a first comparison A first comparison circuit that detects a match between the value and the count value to determine a communication failure state, and a count value that is counted by a counter circuit initialized by a detection signal that determines a communication failure state and a second predetermined value. A second comparison circuit for comparing the comparison value and detecting a match between the second comparison value and the count value and outputting a signal for resetting the communication means. It is D display.

An LED display having communication means for communicating data between a controller for supplying a control signal for a display unit and a distribution board and / or between a display unit and a distribution board is provided. First detecting means for detecting a predetermined period (T1) from a signal (V) input to the means at a constant period and determining a communication failure state; and a predetermined period for detecting a communication failure state for a predetermined period. An LED display having (T2) and having at least a second detecting means for outputting a signal for resetting the receiving means and the transmitting means of the communication means.

The invention according to claim 34 is an LED display having communication status information storage means for storing a communication failure status.
The invention according to claim 35 is an LED display in which the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.
The communication state information storage means for storing the communication failure state is a storage means for deleting the storage of the communication failure state when the first signal is input from the communication means, An LED display that is a communication means that allows the first signal to be input at any time.

According to a thirty-seventh aspect of the present invention, there is provided a counter circuit in which a count value is initialized by a signal (V) input to a communication means at a constant period, and a count value counted by the counter circuit and a preset comparison value (M ), And a comparison circuit that detects a match between the comparison value (M) and the count value and determines a communication failure state.
The communication control device according to claim 38, further comprising: a first detection unit that detects a predetermined period (T1) from a signal (V) input to the communication unit at a predetermined period and determines that a communication failure has occurred. is.

The invention according to claim 39 is a communication control device having communication state information storage means for storing a communication failure state.
The invention according to claim 40 is a communication control device in which the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.

The invention according to claim 41 is a counter circuit in which a count value is initialized by a signal (V) input to the communication means at a constant period, and a first comparison between the count value counted by the counter circuit and a preset count value. The first comparison circuit compares the value with the first comparison value and detects the coincidence of the count value to determine a communication failure state, and counts by a counter circuit initialized by a detection signal that determines the communication failure state. A communication control device having a second comparison circuit that compares the count value with a preset second comparison value, and detects a match between the second comparison value and the count value and outputs a signal for resetting communication means. is.
The invention according to claim 42, wherein a first detection means for detecting a predetermined fixed period (T1) from a signal (V) inputted to the communication means at a fixed cycle and determining a communication failure state; The communication control device includes a second detection unit that detects a predetermined fixed period (T2) from the detection signal and determines that a signal for resetting at least the reception unit and the transmission unit of the communication unit is output.

The invention according to claim 43 is a communication control device having communication state information storage means for storing a communication failure state.
The invention according to claim 44 is a communication control device in which the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.
The communication state information storage means storing the communication failure state is a storage means for deleting the storage of the communication failure state when the first signal is input from the communication means, This is a communication control device that is a communication means that allows the first signal to be input at any time.

The invention according to claim 46 is a building including an LED display having communication means for communicating data between a controller that supplies a control signal of the display unit and the display unit or / and between the display units, A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
An LED display having a comparison circuit that compares the count value counted by the counter circuit with a comparison value (M) input in advance and detects a match between the comparison value (M) and the count value to determine a communication failure state. It is a building to prepare.
The invention according to claim 47, in a building including an LED display having communication means for communicating data between a controller that supplies a control signal for the display unit and the display unit or / and between the display units, This building is equipped with an LED display that has a first detection unit that detects a predetermined period (T1) from a signal (V) input to the communication unit at a constant period and determines that a communication failure has occurred.

The invention according to claim 48 is a building including an LED display having communication status information storage means for storing a communication failure status.
The invention according to claim 49 is a building including an LED display in which the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.
The invention according to claim 50 is a building including an LED display having communication means for communicating data between a controller that supplies a control signal for the display unit and the display unit or / and between the display units. A counter circuit in which a count value is initialized by a signal (V) input to the communication means at a constant cycle, a counter value counted by the counter circuit and a first comparison value set in advance, and A first comparison circuit that detects a match between the comparison value and the count value to determine a communication failure state and a counter value initialized by a counter circuit initialized by a detection signal that determines a communication failure state and a preset second count value A second comparison that compares the second comparison value and detects a match between the second comparison value and the count value and issues a signal to reset the communication means. The building comprising an LED indicator and a road.

The invention according to claim 51, in a building including an LED display having communication means for communicating data between a controller that supplies a control signal for the display unit and the display unit and / or between the display units, A first detecting means for detecting a predetermined period (T1) from a signal (V) inputted to the communication means at a constant period to determine a communication failure state; This building is equipped with an LED display having a period (T2) and at least a second detecting means for outputting a signal for resetting the receiving means and the transmitting means of the communication means.
The invention according to claim 52 is a building including an LED display having communication status information storage means for storing a communication failure status.

The invention according to claim 53 is a building including an LED display in which the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.
An invention according to claim 54 is a communication state information storage unit that stores a communication failure state, wherein the storage of the communication failure state is deleted when a first signal is input from the communication unit, This building is equipped with an LED display, which is a communication means that allows the first signal to be input at any time.

55. A building comprising an LED display having communication means for communicating data between a controller for supplying a control signal for a display unit and a distribution board and / or between a display unit and a distribution board. A counter circuit in which a count value is initialized by a signal (V) inputted to the communication means at a constant period, a count value counted by the counter circuit is compared with a comparison value (M) inputted in advance, and a comparison is made. This building is equipped with an LED display that has a comparison circuit that detects a match between the value (M) and the count value and determines that a communication failure has occurred.
The invention according to claim 56, wherein the building includes an LED display having communication means for communicating data between a controller for supplying a control signal for the display unit and the distribution board and / or between the display unit and the distribution board. This is a building equipped with an LED display having a first detection means for detecting a predetermined fixed period (T1) from a signal (V) inputted to the communication means at a constant cycle and determining a communication failure state.

The invention according to claim 57 is a building including an LED display having communication status information storage means for storing a communication failure status.
The invention according to claim 58 is a building including an LED display in which the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.
The invention according to claim 59, wherein the building comprises an LED display having communication means for communicating data between a controller supplying a control signal for the display unit and the distribution board and / or between the display unit and the distribution board. A counter circuit in which a count value is initialized by a signal (V) input to the communication means at a constant period, a count value counted by the counter circuit is compared with a preset first comparison value, and A first comparison circuit that detects the coincidence of the one comparison value and the count value and determines the communication failure state, and a count value that is counted by a counter circuit initialized by a detection signal that determines the communication failure state and a preset count value The second comparison value is compared with the second comparison value, and the second comparison value is detected to match the count value and a signal for resetting the communication means is issued. The building comprising an LED indicator and a 較回 path.

The invention according to claim 60 is a building including an LED display having communication means for communicating data between a controller that supplies a control signal for the display unit and the distribution board and / or between the display unit and the distribution board. A first detecting means for detecting a predetermined time period (T1) from a signal (V) inputted to the communication means at a constant cycle to determine a communication failure state; This is a building equipped with an LED display having a second detection means for detecting a certain period (T2) of the communication means and outputting a signal for resetting at least the reception means and the transmission means of the communication means.
The invention according to claim 61 is a building including an LED display having communication status information storage means for storing a communication failure status.

The invention according to claim 62 is a building including an LED display in which the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.
The communication state information storage means storing the communication failure state is a storage means for deleting the storage of the communication failure state when the first signal is input from the communication means, This building is equipped with an LED display, which is a communication means that allows the first signal to be input at any time.

The invention according to claim 64 is a method for driving an LED display, comprising: a communication unit for communicating data between a controller that supplies a control signal for the display unit and the display unit or / and between the display units. A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant period; a counter value counted by the counter circuit and a first comparison value set in advance; A first comparison circuit that detects the coincidence of the comparison value and the count value to determine a communication failure state, and a count value that is counted by a counter circuit initialized by a detection signal that determines a communication failure state and a second preset value And a second comparison circuit for detecting a match between the second comparison value and the count value and outputting a signal for resetting the communication means. It is a method of driving the ED display.
The invention according to claim 65 is a method for driving an LED display, comprising: a communication unit for communicating data between a controller that supplies a control signal for the display unit and the display unit and / or between the display units. A first detecting means for detecting a predetermined period (T1) from a signal (V) inputted to the communication means at a constant period to determine a communication failure state; This is a method of driving an LED display having a period (T2) and a second detection unit for outputting a signal for resetting at least the reception unit and the transmission unit of the communication unit.

The invention according to claim 66 is a method for driving an LED display having communication state information storage means for storing a communication failure state.
The invention according to claim 67 is a method for driving an LED display, wherein the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.
The invention according to claim 68 is a method for driving a communication control device having communication means for communicating data between a controller for supplying a control signal for a display unit and a distribution board and / or between a display unit and a distribution board. A counter circuit in which a count value is initialized by a signal (V) input to the communication means at a constant period, a count value counted by the counter circuit is compared with a preset first comparison value, and A first comparison circuit that detects the coincidence of the one comparison value and the count value and determines the communication failure state, and a count value that is counted by a counter circuit initialized by a detection signal that determines the communication failure state and a preset count value A second comparison circuit that compares the second comparison value and detects a match between the second comparison value and the count value and outputs a signal for resetting the communication unit. This driving method for a communication control apparatus having.

The invention according to claim 69 is a method for driving a communication control device having communication means for communicating data between a controller for supplying a control signal for a display unit and a distribution board and / or between the display unit and the distribution board. A first detecting means for detecting a predetermined time period (T1) from a signal (V) inputted to the communication means at a constant cycle to determine a communication failure state; This is a method for driving a communication control device having a second detection means for detecting a predetermined period (T2) of the communication means and outputting a signal for resetting at least the reception means and the transmission means of the communication means.
An invention according to claim 70 is a method for driving a communication control device having communication state information storage means for storing a communication failure state.

The invention according to claim 71 is a method for driving a communication control device, wherein the signal (V) input at a constant period is a vertical and / or horizontal synchronization signal.
A plurality of LEDs cascaded via a communication signal connector (33) to enable full-duplex or / and half-duplex bidirectional packet communication (34) from the LED unit controller (35). In an LED display including an LED unit block (32) composed of a unit (31), at least the LED unit (31) includes a communication unit (13) having a reception circuit (11) and a transmission circuit (12); A counter circuit (15) electrically connected to receive a vertical synchronization signal (110) from the circuit (11), a counter value 1 (113) of the counter circuit (15) and a preset comparison value 1 ( 114), and if they match, the signal is input to the counter circuit 1 (15) to become a reset signal, and is input to the storage device (18). A comparison circuit 1 (16) for outputting the counter value 1 (15) is electrically connected to the counter circuit 1 (15), and compares the counter value of the counter circuit 1 (15) with a preset comparison value 2 (116). This LED display has a protection circuit consisting of a comparison circuit 2 (17) that outputs a communication unit reset signal (111) if they match.

The communication failure information (verr-b) including the flag 1 (115) stored in the storage device (18), wherein the storage device (18) is electrically connected to the communication unit (13). The communication unit (13) arbitrarily reads (112) and inputs a read clear signal (19) from the receiving circuit (11) that can erase the communication failure information (verr-b) (112) in the storage device (18). LED display is a storage device that is used.
The invention according to claim 74 is a plurality of distribution boards (72) cascaded to enable full-duplex bidirectional packet communication (76) from the LED controller (71) and the distribution boards (72) by star wiring. In an LED display composed of LED units (73) connected radially, at least a distribution board (72) includes a communication unit (13) having a reception circuit (11) and a transmission circuit (12), and a reception circuit (11). ), A counter circuit (15) electrically connected to receive a vertical synchronization signal (110), a counter value 1 (113) of the counter circuit (15) and a preset comparison value 1 (114). Are compared, they are input to the counter circuit 1 (15), become a reset signal, and output the flag 1 (115) when input to the storage device (18). (16) is compared with the counter value of the counter circuit 1 (15) which is electrically connected to the counter circuit 1 (15) and a preset comparison value 2 (116). This LED display has a protection circuit consisting of a comparison circuit 2 (17) that outputs (111).

The communication failure information (verr-b) comprising the flag 1 (115) stored in the storage device (18) when the storage device (18) is electrically connected to the communication unit (13). The communication unit (13) arbitrarily reads out (112) and generates a read clear signal (19) that can erase the communication failure information (verr-b) (112) in the storage device (18) from the receiving circuit (11). It is an LED display that is a storage device to be input.
In the invention according to claim 76, the communication state (ve-cnt) (119) indicating the count status from the counter circuit 1 (15) is input to and stored in the storage device (18). This is an LED display in which a preset comparison value 1 (114) and a preset comparison value 2 (116) are set and held in the storage device (18).

The invention according to claim 77 provides a plurality of LEDs cascaded via a communication signal connector (33) to enable full-duplex or / and half-duplex bidirectional packet communication (34) from the LED unit controller (35). In an LED display including an LED unit block (32) composed of a unit (31), at least the LED unit (31) includes a communication unit (13) having a reception circuit (11) and a transmission circuit (12); A counter circuit (15) electrically connected to receive a vertical synchronization signal (110) from the circuit (11), a counter value 1 (113) of the counter circuit (15) and a preset comparison value 1 ( 114), and if they match, the signal is input to the counter circuit 1 (15) to become a reset signal and the flag 1 (1) input to the storage device (18). 15) The LED indicator, characterized in that it comprises a protection circuit consisting of comparator circuit 1 (16) for outputting the communication unit reset signal (111) selectively with. Here, as a typical example of the comparison circuit 1 for selectively outputting the flag 1 and the communication unit reset signal, in the circuit configuration shown in FIG. 13 according to the fifth embodiment, as shown in the timing chart of FIG. Is a comparator circuit that outputs a communication unit reset signal when the count value matches while the count value matches, and raises the flag 1 when the count value matches in any other state.

In the invention according to claim 78, the storage device (18) is electrically connected to the communication unit (13), and the communication failure information (verr-b) comprising the flag 1 (115) stored in the storage device (18). ) (112) is read arbitrarily by the communication unit (13), and a read clear signal (19) capable of erasing the communication failure information (verr-b) (112) in the storage device (18) from the receiving circuit (11). It is an LED display that is a storage device to be input.
The invention according to claim 79 is a plurality of distribution boards (72) cascaded so as to enable full-duplex bidirectional packet communication (76) from the LED controller (71) and the distribution boards (72) by star-type wiring. In an LED display composed of LED units (73) connected radially, at least a distribution board (72) includes a communication unit (13) having a reception circuit (11) and a transmission circuit (12), and a reception circuit (11). ), A counter circuit (15) electrically connected to receive a vertical synchronization signal (110), a counter value 1 (113) of the counter circuit (15) and a preset comparison value 1 (114). Are compared, they are input to the counter circuit 1 (15) to become a reset signal, and the flag 1 (115) input to the storage device (18) and the communication unit reset signal 111) is an LED indicator having a protection circuit comprising a comparator circuit 1 (16) for outputting selectively the.

The invention according to Claim 80 is a communication failure information (verr-b) comprising the flag 1 (115) stored in the storage device (18), wherein the storage device (18) is electrically connected to the communication unit (13). The communication section (13) arbitrarily reads out the communication failure information (verr-b) (112) in the storage device (18) from the reception circuit (11), and the read clear signal (19). Is an LED display that is a storage device to which is input.
The communication device according to claim 81, wherein the communication state (ve-cnt) (119) indicating the count status from the counter circuit 1 (15) is input to and stored in the storage device (18). This is an LED display in which a preset comparison value 1 (114) and a preset comparison value 2 (116) are set and held in the storage device (18).

In the invention according to claim 82, a communication unit (174) including at least a transmission circuit (173) and a reception circuit (172), and a signal (V) having a constant period input from the communication unit (174) are input. ), A first detection means (170) for detecting a predetermined time (T1), and a detection signal connected to the first detection means (170) for detecting the predetermined time (T1) are inputted and detected. A communication control device comprising a second detection means (171) for detecting a predetermined time (T2) from the input of a signal and outputting a reset signal of at least a communication means (175) including a communication part (174). .
As a result, it is possible to configure a circuit for completely restoring a communication failure that continues to provide a reset signal until communication is completely restored.
Also, in the invention according to claim 83, in the communication between the display LED unit or the display LED controller and the display LED unit, the vertical or horizontal synchronization signal input at a constant cycle is not received for a certain fixed period or more. LED drive communication control circuit that detects

The invention according to claim 84 is an LED drive communication control circuit capable of adjusting a certain period during which a vertical or horizontal synchronization signal input at a certain period is not received.
The invention according to claim 85 is characterized in that, when it is detected that a vertical or horizontal synchronizing signal inputted in a fixed cycle is not received for a fixed period or more, a communication failure state is determined and the information can be stored. Communication control circuit for driving LED with information storage device.

The invention according to claim 86 is an LED drive communication control circuit that resets at least a reception circuit and a transmission circuit in the communication unit when a certain period elapses after the communication failure state.
The invention according to claim 87 is an LED drive communication control circuit capable of adjusting at least a predetermined period from when a communication failure state occurs to when at least the reception circuit and the transmission circuit inside the communication unit are reset.

The invention according to claim 88 is an LED drive communication control circuit having a function of recovering from a communication failure state to a normal operation state when a signal is detected in the communication failure state.
In the invention according to claim 89, the communication status information storage device storing the communication fault status information has a function of retaining the communication fault status information storage even after the communication status is restored until a read clear signal is input. Communication control circuit for driving LED.

(Communication department)
In addition, the communication unit according to the present invention is a unit that can perform communication by receiving and transmitting signals and the like including information with the outside by including a transmitting unit and a receiving unit for communicating with the outside, for example. Yes, typically a communication unit (13) in communication means, wireless communication using radio waves, infrared rays, light waves, electromagnetic waves, or the like as a medium, or wired communication using electricity, electronics, light, vibration, expansion, contraction, or the like as a signal medium. The type and method of communication such as communication are not limited. For example, by providing a receiving circuit and a transmitting circuit, it is possible to exchange (communicate) signals and the like with the outside. It performs two-way communication. The communication according to the present invention does not refer to one-way communication other than two-way communication, wired communication, or wireless communication.

The communication means includes at least the communication unit and the first detection means, and may preferably have other circuit configurations such as a second detection means, a counter circuit, a comparison circuit, and a storage means.

(Communication control device)
The communication control device according to the present invention is, for example, a device for communicating various information signals for lighting and displaying images and characters on a dot matrix LED display, and various controls for accurately displaying and lighting those signals as expected. It refers to a device that can control signals, such as control, distribution, and coupling, including the communication unit.

(Signal (V))
The signal (V) input at a constant period according to the present invention refers to a control signal such as 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. The signal is applicable as long as it can be used as another signal, and is not particularly limited. When one screen display data is sent as a packet for each unit based on the vertical synchronization signal as an image switching signal, the vertical synchronization signal is preferably used.

(Counter circuit)
The counter circuit according to the present invention is, for example, a normal counter circuit, and may count a count value (or count value) corresponding to a predetermined time by sequentially counting a predetermined numerical value at a predetermined timing. That is, there are some which can measure time, but the present invention is not limited to this. In this specification, the counter value input to the comparison circuit 1 is referred to as a counter value 1, and the value input to the comparison circuit 2 when the comparison circuit 2 is provided is referred to as the counter value 2 in this specification. The function of the circuit of the present invention can be configured without necessarily having two circuits.

As a typical example, the counter circuit 1 (15) is reset every signal (V) input at a constant period, for example, a vertical synchronization signal (V), and the flag 1 (15) output from the comparison circuit 1 (16). 15), and reset by the communication unit reset signal (111). The communication unit reset signal (111) is input so as to reset at least the entire communication unit (13) and the counter circuit 1 (15), that is, the communication unit reset signal (111) includes the communication unit (13). This is a signal for resetting the communication means.

(Comparison value)
The comparison value according to the present invention, for example, the comparison value 1 (M) is a value to be compared with the counter value of the counter circuit in the first comparison circuit, and can be set to any predetermined value. For example, the comparison value (M) can be set as a count value corresponding to the time (T1) from the signal (V). Similarly, the comparison value (N) can be set to an arbitrary predetermined value. For example, it is possible to set the comparison value (N) as a count value corresponding to the time (T2) after it is determined that a communication failure has occurred. In addition, M and N are numerical values for convenience of explanation, and the magnitude relation is arbitrary, even if they are the same or different. When the second comparison circuit (comparison circuit 2) is provided, the comparison value compared by the second comparison circuit is referred to as a second comparison value (comparison value 2). The configuration having the function of the present invention can be realized without necessarily providing the second comparison value and the second comparison circuit. Further, the comparison value may be set in the comparison circuit itself, or may be stored and set in a storage device or the like, and the circuit may be configured to be readable by the comparison circuit. Further, the comparison value may be set to a fixed value, or may be configured to be changeable as a variable value from the outside. When the circuit is configured so that the setting can be changed, it is possible to appropriately design and set the display quality such as the environment and situation in which the communication device and the LED display are used, the required specifications, and the like.

(Communication failure status)
The communication failure state according to the present invention indicates a state different from a normal state (or a normal state or a steady driving state), and indicates a state in which normal communication cannot be performed. That is, for example, in an LED display or the like, it indicates a state in which transmission and reception of communication signals related to display data and the like, that is, a state in which communication data such as display information and various control signals cannot be exchanged, for example, a reception signal that should be originally input is not input A state, a state in which a transmission signal to be transmitted is not output, a state in which a communication signal is disconnected, and the like can be considered.

(Communication failure information)
The communication failure information (112) includes at least both the communication state storage information (119) and the "high" and "low" flags 1 indicating the presence or absence of a failure and can be read. In addition, it is possible to provide, hold, and output information related to various communication failures such as the duration, occurrence date and time, number of times, degree, content, and location of the communication failure.

(Communication state storage information)
The communication state storage information (119) according to the present invention is typically a continuation period of a communication failure state, but can be replaced with a reference time or a count value of a counter. Further, it is preferable that the stored information includes communication failure information (112).

(Detection means)
The detecting means for determining a communication failure state according to the present invention is, for example, a circuit (14) of the present invention, typically comprising a first detecting means and a second detecting means, for example, a counter circuit 1 (15). And the comparison circuit 1 (16), the comparison circuit 1 (16) detects the count value (M) counted during the predetermined time (T1), and at the same time, the comparison circuit 1 (16) sets the flag 1 (115). The above means can be used as a detecting means capable of determining a communication failure state as a circuit. However, other configurations are not excluded as long as the communication failure state can be detected functionally.

Typical first detecting means is means capable of measuring time (T1) from a signal (V) of a fixed period, and is typically constituted by a counter circuit and a comparing circuit. In addition, a storage device may be provided in addition to this, or the configuration may be such that the comparison value in the comparison circuit can be arbitrarily set from outside. When a storage device is provided, information related to communication failures, that is, the number and time of communication failures, current and past communication conditions, and the like are input, stored, and output based on signals from a counter circuit and a comparison circuit. May be. Further, when the comparison value is configured to be able to be set externally, the setting can be arbitrarily changed according to the occurrence situation of the communication failure, the use environment, and the like, so that a highly versatile device can be configured. When the first detecting means detects the time (T1), the signal output of the comparison circuit or the like and the communication unit can be electrically connected so as to output a signal for resetting the transmission circuit and the reception circuit of the communication unit. . When the second detection means is provided, the signal output of the comparison circuit or the like is electrically connected to the second detection means, and after the second detection means detects a predetermined time (T2), The second detection means may output a signal for resetting at least the communication unit.

A typical second detecting means is composed of a comparing circuit and a counter circuit, and detects a predetermined time (T2) from input of a signal (for example, flag 1) from the first detecting means for recognizing a communication failure state. And a signal for resetting the communication unit. The signal for resetting the communication unit may be simultaneously input to the counter circuit and reset the counter circuit. Further, the counter circuit can be configured by using one counter circuit in combination with the first detecting means and the second detecting means. However, even if each counter circuit is provided, three or more counter circuits can be used. May constitute the detecting means.

As shown in FIG. 17, the continuous detection of the signal (V) is monitored by the first detection means, and when the signal (V) is interrupted, it is determined that a communication failure state has occurred. It is desirable that a reset signal is output from the second detecting means every time the means detects a certain period (T2) further, and the communication means including the communication unit, the first detecting means, and the second detecting means is reset. . Also in this case, the second detecting means can be omitted.

As another typical example, the second detecting means according to the present invention is constituted by, for example, a counter circuit (15), a comparing circuit (17), and a storage device (18) in the circuit (14) of the present invention. A communication unit reset signal capable of promptly returning to a normal state after being determined to be in a communication failure state, and transmitting a communication unit reset signal every predetermined time (T2). It is a more preferable typical configuration to include a storage device (18) capable of storing and holding information. The installation location of the second detection means is typically inside the LED unit or / and inside the distribution board as in the circuit of the present invention including the first detection means, but is provided at another location, for example, in the LED unit controller. You can also. When provided in the LED unit controller (same as the controller), it is possible to monitor the transmission / reception status before transmitting a signal (V) having a fixed period such as a vertical synchronization signal to the LED unit. Further, it is desirable that the communication unit reset signal (111) be continuously output at a constant period (T2) until communication is completely restored.

(Storage means)
The communication status information storage means according to the present invention includes, for example, a storage device that includes various memories, various storage media such as a magneto-optical medium and a hologram storage device, and can store and hold all relevant information including the quality of communication. It can be configured as follows. A typical storage device is a device capable of storing / reading information on / from a storage medium, and has various modes including a storage medium memory such as various MOs, hard disks, FDs, CD-R / Ws, DVDs, and personal computers. Exists, but does not matter in particular.

記憶 Further, as shown in the embodiment, it is possible to form the circuit embodying the present invention as a circuit configuration in which this storage means is omitted. When the storage means is not provided, the communication state (119) (ve-cnt) from the counter circuit 1 (15) is a two-way communication, and is sent directly to the controller (66) through the communication unit (13) for monitoring. I can do it. In this case, a real-time monitor can be used. In particular, the controller side is located close to the operator, so that not only remote operation of the display contents but also constant monitoring of the communication status such as communication failure status is possible. A particularly excellent system can be constructed.

(Control signal)
The control signal according to the present invention includes, for example, a video signal for display on an LED display or the like and various control signals for display as expected, for performing predetermined control on units and related devices inside and outside the controller. And the like that are communicated.

(Detection signal)
The detection signal for determining a communication failure state according to the present invention may be, for example, a flag signal (flag 1 (115)) output from the comparison circuit 1 (16). Typically, if the comparison circuit 1 compares and compares the comparison value 1 (M) with the count value 1 of the counter circuit, that is, if a predetermined time (T1) from the signal (V) is detected, a communication failure state occurs. The comparison circuit 1 can output a detection signal such as the flag 1.

(Reception means)
The receiving means according to the present invention means, for example, a device provided with a receiving circuit (11) and the like, and typically capable of receiving communication information such as communication radio waves. In particular, the receiving means for packet communication is preferable because the present invention exerts a remarkable function / effect when recovering a communication failure caused by a specific bit conversion error or the like.

(Transmitting means)
The transmission means according to the present invention means, for example, a device that includes a transmission circuit (12) and the like and can typically transmit communication information such as communication radio waves. In particular, the receiving means for packet communication is preferable because the present invention exerts a remarkable function / effect when recovering a communication failure caused by a specific bit conversion error or the like.

(First signal)
The first signal referred to in the present invention is a signal that triggers an instruction to read stored information such as a read clear signal (19) from the storage device and to erase the stored information stored in the storage device (18). A signal (trigger signal) or a signal that directly performs the above operation. Further, the method of communicating the first signal to the storage means may be any communication method such as wired / wireless. In the case where the communication failure information can be directly read from the storage means to the controller side or the like without going through the communication means or the communication unit according to the present invention, the first signal is the communication failure information provided on the controller side. A storage device can be directly accessed, input / output, and erased from a reading device (for example, a personal computer). Further, it is also possible to make a warning sound, turn on / off the LED indicator, and the like in accordance with the flag 1 and the communication state (119) according to the communication failure situation.

The display unit according to the present invention such as a (display unit) includes, for example, an LED display and an LED display device. The control unit according to the present invention includes an LED display control for controlling the LED display and the LED display device. And an LED display control device. Further, the display unit according to the present invention is not limited to an LED display unit, and may be of any type as long as it is a display display unit such as an organic or inorganic EL display unit, a CRT, a liquid crystal, a plasma display unit, and an electric bulletin board. . Further, it can be used for a display unit using illumination such as a neon tube. Further, the present invention can be similarly applied to a display unit having a lighting function.

(Distribution board)
It acts as a relay for distributing and transmitting signals from the controller to each unit. Since the distribution board is often the hub of communication, it is particularly desirable to provide the circuit configuration of the present invention and monitor the smooth transmission and reception of communication.

(building)
The building referred to in the present invention is a building, which refers to high-rise buildings such as so-called condominiums and buildings, as well as artificial buildings such as apartments, one-story houses, detached houses, steel towers, advertising towers, and natural objects such as cliffs. is not. The LED display can be installed, and includes the support structure on which the LED display is installed and the base thereof.

By using the present invention, it is possible to greatly increase the possibility of recovering from the communication disabled state (communication failure state) to the normal state. For example, in the case where the data length A is specified in the received data, the data length usually matches the actually transmitted data length B. However, if A is larger than B for some reason, the communication is disabled (waiting for remaining data). The communication circuit may be fixed (frozen) in this state), and communication may not be possible even if a communication line is inserted or removed during communication (hot swapping). Can be restored, and the reliability of communication has been improved. In a building or the like, the effect on not only the display quality of the LED display itself but also the operation of electric appliances and the like inside and outside the building is reduced, the service life is extended, and the effect is particularly large in a densely used condition.

(First embodiment of the present invention)
The configuration and operation of the present invention will be described by taking a vertical synchronization signal circuit as an embodiment as an example. As shown in FIG. 1, first, a signal (V) externally input to the communication unit (13) at a constant period is used. As a display control signal of the LED unit, for example, there is a vertical synchronization signal (110). The LED unit switches the display data by this signal, and this signal (V), that is, the vertical synchronizing signal (110) is not usually interrupted. Conversely, interruption of the vertical synchronization signal (110) means that the LED unit is in a communication failure state.

(4) Prepare a counter circuit 1 (15), a comparison circuit 1 (16), and a comparison circuit 2 (17) so that this state can be detected. Usually, this counter circuit 1 (15) is periodically reset by the vertical synchronizing signal (110). However, if the vertical synchronizing signal (V) is interrupted, the counter circuit (counter circuit 1 (15)) is not reset, and continues counting up. When the counted-up counter value 1 (113) becomes a comparison value 1 (M) (114) of a given value, it is recognized as a communication failure state. When a communication failure state occurs, after a predetermined time (T2) has elapsed therefrom, the reception circuit (11), the transmission circuit (12), and the counter circuit (15) are reset (initialized) and restored to the normal state. be able to.

Next, when the communication failure state is detected, data indicating that a communication failure state has occurred is written into the storage device (18). This storage device (18) can be freely read from the outside through the communication unit (13), and is reset by a read clear signal (19) immediately after reading. Further, by reading continuously, the current and latest communication failure state can be known. The communication state storage information (or communication failure information) is not limited as long as it is information related to the communication failure, in addition to the date and time related to the presence or absence of the communication failure and the details of the failure.

(1) A detailed block diagram of the circuit of the present invention is shown in FIG. 1, and a timing chart is shown in FIG. The vertical synchronizing signal is a synchronizing signal obtained by detecting received data input at a constant period (V) by external communication. When the vertical synchronizing signal (110) is input to the counter circuit 1 (15) (input 1), the counter circuit 1 (15) is reset and counts up again from the initial value ("0" in FIG. 2). However, the counter circuit 1 (15) is not reset unless the vertical synchronizing signal (110) is input, so that the count-up is further advanced and the counter value 1 (113) is set to the comparator circuit 1 (16). When the comparison value becomes 1 (114) (“M” in FIG. 2), the flag 1 (115) is raised (FIG. 2 is “high”).

That is, if the vertical synchronization signal (110) is not input for a certain period (T1) or more, it is determined that a communication failure state has occurred. When a communication failure state (a state in which the flag 1 (115) is raised) occurs, the counter circuit 1 (15) is reset and starts counting again from an initial value (from "0" in FIG. 2). When (113) becomes the comparison value 2 (116) (N = “3” in FIG. 2) set to be input to the comparison circuit 2 (17), the communication unit reset signal (111) is output. At the same time, the counter circuit 1 (15) is reset and starts counting again from the initial value ("0" in FIG. 2). During a communication failure, the counting and resetting operations are repeated, and a communication unit reset signal (111) is output at regular intervals (T2). When the vertical synchronization signal (110) is input and received again, it is determined that communication has been restored, the counter circuit 1 (15) is reset, and the flag 1 (115) is lowered (in the figure, "low"). Return to the normal communication state.

As shown in FIG. 2, when a communication failure state occurs, a flag (flag 1 (115)) is raised, and the communication failure information section in the storage device (18) becomes a communication failure recognition state (FIG. 2 is "high"). . This signal remains indicating the communication failure state ("high" in FIG. 2) even if the communication state is restored to the normal state. This is for keeping the communication failure state that has occurred in the past as information. When the read clear signal (19) is input (input 2), the communication failure information section in the storage device (18) is reset, the storage is erased, and the normal state is shown again. In this storage device (18), the communication failure information (verr-b) (112) can be freely read from the outside through the communication unit (13) by communication. The situation (presence or absence of communication failure and related information) can be understood. This storage and reading method does not have to be performed via the communication unit (13).

If the read clear signal (19) is always input after reading the storage device, it is read once if it is desired to know the past communication status, and is read once if it is necessary to know the current / latest communication status. Since the storage device is reset later, and the latest communication state information is input immediately thereafter, the communication state information can be obtained by performing continuous reading. The communication unit reset signal (111) is input to a communication unit (13) for performing communication with the outside, and this signal is used together with the communication unit (13) together with all other circuits (comparing circuits (16, 17 ) And the counter circuit (including 15) are reset (initialized). As a result, the communication can be resumed.

Although the above description has been made based on the vertical synchronization circuit which is one embodiment of the present invention, the circuit of the present invention is not limited to the vertical synchronization circuit but can be applied to a horizontal synchronization circuit. T1, T2, the comparison value, and any other parameters can be set as appropriate according to the operating environment, the purpose of use, and the specifications in accordance with the cycle length of.

(Example 1) FIG. 3 is a schematic diagram showing the structure of an LED display according to an embodiment actually designed and operated, and FIG. 4 is a schematic diagram showing the circuit structure inside the LED unit shown in FIG. The LED unit controller (35) and the LED unit (31) are connected in a plurality of stages (LED unit block (32)) to constitute the LED unit controller (35) and the LED unit (31) or the LED units (31). Full-duplex / half-duplex bidirectional packet communication is performed between them. Since the LED unit (31) uses bidirectional communication, the direction of the signal is no longer fixed, so that there is no distinction between input and output of the connector (input and output can be performed from either left or right in the figure). ) And the communication line between the LED unit controllers (35) can be connected with the shortest distance.

Thus, it is possible to minimize phenomena that contribute to communication failures such as signal waveform attenuation and radiation noise caused by the length of the communication distance. Further, since the number of signal lines is reduced, a differential transmission system (balanced transmission system) can be used, and radiation noise, communication distance, and communication speed can be improved. In this embodiment, the balanced transmission method, the unbalanced transmission method, or a mixture thereof, for example, the transmission is performed from the controller by the balanced transmission method, and the configuration is such that the transmission is converted to the unbalanced transmission method before the LED unit, and the normal operation is performed. I have confirmed.

(5) The LED unit controller (35) can individually send packet data to all the LED units (31), and transmits a display data packet to all the LED units (31) at a cycle of usually 60 Hz. The received display data is sent to the storage device (47) by the communication means (45) inside the LED drive circuit (44) mounted one by one in the LED unit (43). When the driver IC control circuit (48) reads out the data, display data is sent to the LED driver IC (49), and the LED lighting operation is started.

In addition, control data can be written to and read from a storage device (47) inside each LED unit (43) other than display data, and various setting data (current value, lighting time) can be stored in the LED driver IC (49). Etc.) can be transferred. Further, a VSYNC synchronization packet is transmitted from the controller (35) to the LED unit (43) as a vertical synchronization signal for starting a lighting operation of display data for one screen, and a reception circuit (45) provided inside the communication means (45). When receiving the signal 41), the receiving circuit 41 generates a VSYNC signal, and all the LED units 31 perform a lighting operation for one screen based on the VSYNC signal. Usually, the VSYNC synchronization packet is input to the LED unit (31) side at a constant period of 60 Hz (about 16.6 ms).

In performing packet communication, the VSYNC synchronization packet cycle is an important value that determines the number of connection stages of the LED units (31), and display data of all the LED units (31) must be transmitted within the VSYNC synchronization packet cycle. Must. That is, if the display performance such as image quality is ignored, the greater the period of the VSYNC synchronization packet, the greater the number of connection stages of the LED unit (31), and the smaller the number, the smaller the number. Therefore, the VSYNC synchronization packet cycle is appropriately adjusted / set according to the function required of the circuit.

In this embodiment, the circuit of the present invention is configured around the receiving circuit (41) and the transmitting circuit (42) of the communication means (45) in the LED driving circuit (44) inside the LED unit (43). . The circuit (46) of the present invention sets the time (T1) from the reception of the last vertical synchronization signal (V) before the communication failure state to the recognition of the communication failure state as the communication failure state in the present VSYNC synchronization packet cycle of 16.6 ms. In order to perform the lighting display operation of the LED unit (43), it is necessary to set a sufficient margin at 16.6 ms or more. That is, this time (T1) can be determined according to the VSYNC synchronization packet cycle or the like.

Regarding the time (T1) from the communication failure state to the resetting of the communication means (45) and the cycle of the communication unit reset (T2), the reception of the VSYNC synchronization packet and the communication unit reset signal by accident in the communication failure state If they overlap, normal reception of a VSYNC synchronization packet (data obtained by converting a vertical synchronization signal transmitted from the controller into a packet format) cannot be performed, and the communication failure state is not recovered (the recovery to the normal state is performed at least in the following manner). It is particularly preferable to set the value to a value larger than the length of the VSYNC synchronization packet itself.

That is, if the VSYNC synchronization packet reception and the communication unit reset signal accidentally overlap with each other in the communication failure state, all of the communication means (45) as well as the signal being received by the communication unit (45) during the reception of the VSYNC synchronization packet are transmitted by the communication unit reset signal. This is because the VSYNC is reset (initialized), the VSYNC synchronization signal is not received and input, and recovery from a communication failure is not performed. Therefore, it is particularly preferable that the probability that the VSYNC synchronization packet reception and the communication unit reset signal overlap with each other is sufficiently low. In this embodiment, (T2) is set from 16.6 ms to 1 s while the length of the VSYNC synchronization packet itself is 2.56 μs, and normal operation is confirmed.

Also, since the cycle (V) is not limited to 60 Hz (16.6 ms), it is necessary to perform the optimal setting of (T1) based on the value (V). For example, when the period (V) becomes 66.4 ms, it is preferable that (T1) be at least 66.4 ms or more. Further, in the communication failure state, the display operation of the LED unit is stopped or the frame skips (display for several screens is not performed). Therefore, from receiving the last vertical synchronization signal before the communication failure state to arranging the recovery of the failure state. The shortest time (T1 + T2) is preferably as short as possible. In this embodiment, (T1 + T2) is set in the range of 33.2 ms to 2 s, and normal operation is confirmed.

(Example 2) Another embodiment is shown below as Example 2. The LED display block (61) shown in FIG. 6 has an LED unit (62) having a 24 × 48 dot configuration (1 dot per 3 RGB pixels) arranged in a matrix of 4 columns × 4 rows. The controller (66) in the figure has four video (display) data output terminals, to which a general-purpose LAN cable (611) can be connected. From here, the display data is packetized inside the controller (66) and output as an LVDS (Low Voltage Differential Signal) differential signal, and can be transmitted at a data transfer rate of 25 Mbps when the LAN cable (611) is 30 m long. . Generally, it is considered that the longer the length of the cable (611) and the higher the data transfer rate, the more the occurrence of communication errors related to data transmission and reception, and the more serious the communication error contents.

Ｌ An LVDS-LVCMOS conversion circuit (67) is connected between the LED display block (61) and the controller (66), and the LVDS-LVCMOS conversion circuit (67) performs signal level conversion. The display data converted to LVCMOS is sent to each unit (62) connected in cascade. Each unit (62) is mainly composed of an LED driver IC (63) for driving an LED and an LED driver control IC (64) for controlling the LED driver IC (63). The LED driver control IC (64) has a built-in display data RAM (65), and display data for one screen is transferred from the controller (66) to the RAM (65) by a raster scan method. Is converted to the LED driver IC transfer format at the time of reading (69) and transferred to the LED driver IC (63).

In the second embodiment, a package type IC having a relatively small LQFP 64 pin is adopted as the LED driver control IC (64). This is because, since the LED driver control IC (64) is mounted in each unit (62), there is a limitation that the mounting area of the LED driver control IC (64) cannot be so large due to space restrictions. Correspondingly, the interface to the LED driver IC (63) is only one port, and it is compact and lightweight, and the connection structure such as wiring is simple. ing.

Also, since the capacity of the RAM (65) with the LED driver control IC itself is limited by the mounting area, the number of lighting control pixels that can be stored in the RAM (65) is also limited by the RAM capacity. However, having the LED driver control IC (64) inside each unit (62) simplifies the system configuration, does not require extra cable connection, and reduces installation restrictions. Further, if necessary, the capacity of the RAM (65) (corresponding to the image data memory A (87) and the image data memory B (88) in FIG. 8) can be externally expanded by an external expansion memory. It can be set appropriately in matching between the installation area and the required capacity.

ＬＥＤ The LED driver control IC (64) in each unit (62) shown in FIG. 6 is indicated by a hatched portion (83) in FIG. In FIG. 8, the circuit (86) of the present invention according to the second embodiment is installed in a portion adjacent to the communication section (89) so as to be electrically connected to the communication section (89). Details of the circuit (86) are as shown in FIG.

(Embodiment 3) FIG. 7 shows that the output signal lines from the controller (71) are cascaded to a plurality of distribution boards (72), and the distribution boards (72) radiate each unit ( FIG. 73 is a schematic configuration diagram of an LED display unit according to a third embodiment in which the LED display unit is configured to be connected to the LED display unit 73). The controller (71) according to the third embodiment is exactly the same as that of FIG. 6, and has the same signal level, transfer rate, packet format, and the like.

The distribution board (72) has a function equivalent to that of the LED driver control IC (64) in FIG. 6, and in this embodiment, includes a circuit (86) of the present invention as shown by a hatched portion (83) in FIG. I have. That is, display data RAMs (87, 88) are built-in, display data for one screen is transferred from the controller (71) to the RAMs (87, 88) by a raster scan method, and read out from the RAMs (87, 88). The data is converted into an LED driver IC transfer format and transferred to the LED driver IC (74). In the third embodiment, each unit (73) has an LED driver IC (74), but does not have an LED driver control IC. This is because the distribution board has the above-described functions corresponding to the LED driver control IC, or the distribution board has the LED driver control IC itself and is in charge of the functions. Any means having this function is not limited to the circuit (86) of the present invention shown in the hatched portion (83) in FIG. 8 of the embodiment, and can be replaced with another circuit / element having the same function. It is.

The distribution board (72) employs a 208-pin PQFP package FPGA as a device for the LED driver control IC. Since the above configuration, that is, the LED driver IC (74) is in the unit (73) and the LED driver control IC is in the distribution board (72), there is relatively room in the mounting area in the distribution board (72). As a result, the number of terminals can be increased, so that the number of units (73) connected to one distribution board (72) (or LED driver control IC) can be increased, and the image data memory A ( 87), when an external large-capacity RAM is mounted as an extension of B (88), there is an advantage that the number of lighting control pixels can be increased.

8 shows the internal circuit configuration of the unit of FIG. 6, and FIG. 9 shows the internal circuit configuration of the unit of FIG. In the embodiment, both the unit shown in FIG. 6 and the distribution board shown in FIG. 7 include a portion (LED driver control IC (83)) hatched in FIG. 8 as a control circuit for controlling the LED driver IC. FIG. 10 shows an operation time chart of this circuit. The VSYNC signal (vertical synchronization signal) generated inside the controller (66, 71) is constantly generated at a period (V). A VSYNC synchronization packet (VS) is input to the unit in synchronization with the VSYNC signal cycle (V). When the image packets unit1 to unitN are transmitted to each unit during the VSYNC synchronization packet (VS), the lighting operation is started inside the unit. First, a lighting frame is generated inside the unit, a common scan address is operated, and in synchronization with this, image data and a synchronous clock are input to the drive circuit to start a lighting operation.

Inside the LED driver control IC (83), there are two memories, an image data memory A (87) and an image data memory B (88). When a VSYNC synchronization packet (VS) is received, the read and write operations of the two image memories are performed. The operation switches. As shown in FIG. 10, when an image packet (image data 1) is received, it is written to the image data memory A (87). Thereafter, when a VSYNC synchronization packet (VS) is received, the read operation and the write operation of the two image memories are switched, and the read of the image data 1 written in the image data memory A (87) is started, and the image data memory B is read. At (88), the image packet (image data 2) is written. As described above, the continuous image lighting operation is performed by alternately performing writing / reading using the two memories. Note that the order of the memories A and B is variable.

6) Data transfer is performed between the controller (66) and the unit (62) in FIG. 6, and between the controller (71) and the distribution board (72) in FIG. 7 by using LVDS differential signals. It is known that the bit error rate of a differential signal (balanced transmission method) such as LVDS or RS422 or a signal of an ordinary unbalanced transmission method generally increases as the distance increases and as the transfer rate increases. It is extremely difficult to eliminate errors. Then, if there is this bit error, a communication failure due to the bit error will occur. For this reason, when the functions related to the circuit of the present invention are not installed at the transfer distance and transfer rate as shown in the embodiment, the synchronization of full-duplex bidirectional packet communication is lost in about several minutes to several hours. As a result, a communication error (communication failure) occurs, the display cannot be performed, and the communication failure continues.

It is effective to provide the circuit of the present invention shown in FIG.

(Embodiment 4) FIG. 11 shows a fourth embodiment, and FIG. 12 shows an operation timing chart thereof. As shown in FIG. 11, the circuit (14) of the present invention according to the fourth embodiment is electrically connected to the communication unit (13). The communication unit (13) performs full-duplex bidirectional packet communication, and is divided into a transmission circuit (12) and a reception circuit (11). The data received by the receiving circuit (11) is transferred to the transmitting circuit (12) and, if necessary, a preceding unit (or distribution board) or a next unit (or distribution board) having an LED driver control IC having a communication unit (13). Or a distribution board) or a controller. FIG. 11 is a structural diagram schematically shown, and can be applied to any of the unit configurations shown in FIG. 6 and FIG.

(4) When the communication unit (13) of the LED driver control IC detects the VSYNC synchronization packet transmitted from the controller, the receiving circuit generates a vertical synchronization signal (vstart). The vertical synchronization signal (vstart) (110) is input (input 1) to the counter circuit 1 (15) of FIG. 11 showing the fourth embodiment. A clock signal (clk) (117), a reset signal (xreset) (118), and a flag 1 (verr-a) (115) indicating a communication failure state are input to the counter circuit 1 (15) from the outside. In the fourth embodiment, the clock signal (clk) (117) receives the system clock of the LED driver control IC of 25 MHz, and the reset signal (xreset) (118) receives the signal for performing the initial reset operation only at the time of power-on. ing.

The counter value 1 (vcount) (113) which is the output of the counter circuit 1 (15) is reset by the vertical synchronization signal (vstart) (110) as shown in FIG. Start operation. In Example 4 shown here, the counting speed was set to 2.56 μs. The comparison value 1 (114) for setting the time (T1) is (M), and the comparison value 2 (116) for setting the time (T2) is (N). In the present embodiment, these (M) and (N) are stored in the storage device (18) as shown in FIG. 11, and are appropriately read and written by performing data reading and writing operations in the storage device through external communication. It is possible to make settings and change settings.

In the comparison circuit 1 (16), when the comparison value 1 (M) matches the counter value 1 (vcount) (113) output from the counter circuit 1 (15), as shown in FIG. The flag 1 (verr-a) (115) is output from (16). When the flag 1 (verr-a) (115) becomes "high", the counter circuit 1 (15) restarts the counting operation from "0". The state in which the flag 1 (verr-a) (115) becomes "high" is defined as a communication failure state. In this state, the counter value 1 (vcount) (113) and the comparison value 2 (116) (N) If they match, the comparator 2 (17) outputs the communication unit reset signal (v-clr) (111).

The communication unit reset signal (v-clr) (111) is input as a reset signal to all circuits of the communication unit (13) and the counter circuit 1 (15), and the communication unit reset signal (v-clr) (111) is input. Then, all of the communication units (13) are initialized and restored to a state where synchronization is possible again. In FIG. 12, M = 39062 and N = 19531. As a result, (T1) is set to 100.00128 ms, and (T2) is set to 50000192 ms.

As shown in FIG. 12, a communication state (ve-cnt) (119) is provided at the output of the counter circuit 1 (15) so that the current communication state can be known. "1" when the communication unit reset signal (v-clr) (111) is not input, and "2", "3", "4" each time the communication unit reset signal (v-clr) (111) is input. And count. Then, when it is confirmed that the communication has been restored (the vertical synchronization signal (vstart) is received), the value returns to “0”. In the fourth embodiment shown in FIG. 11, a circuit is constructed such that this communication state (ve-cnt) (119) is once stored and held in the storage device (18). This information can be arbitrarily read and erased as communication failure information (verr-b) (112) together with information from the comparison circuit 1 (16) through the communication unit (13). The reading and erasing can be performed by directly connecting the controller such as a personal computer to the RS232C or a LAN cable (including a wireless LAN) without accessing the communication unit (13). Is also good.

Further, as shown in FIG. 12, communication failure information (verr-b) in the storage device is provided inside the storage device (18). As shown in FIG. 12, the communication failure information (verr-b) in the storage device becomes “high” when the communication failure occurs, but is maintained at the “high” state even after recovery from the communication failure state. Is done. This is to make it possible to know whether or not a communication failure has occurred in the past due to external communication. The communication failure immediately after reading the communication failure information (verr-b) (112) from the storage device is performed. The unit outputs a read clear signal (reg-clr) (19), and the communication failure information (verr-b) in the storage device returns to “low”.

Here, in the typical examples (Examples 1 and 4) of the circuit of the present invention as shown in FIG. 1 and FIG. 11, the independent time setting degrees of freedom of (T1) and (T2) are described in detail below. This is larger than another typical example (Example 5) of the circuit of the present invention as shown in FIG. That is, the time setting (T1) until the communication failure state is determined and the time setting (T2) after which the communication unit reset signal (v-clr) (111) is input are set values (M) from the outside, The setting is variable as (N). Therefore, depending on the communication environment, such as the communication speed and communication distance, the environment such as the temperature and humidity in which the communication cable and communication device are used, the communication data amount and data content, the required communication quality, the display method, the number of connection stages, etc. Although the optimal setting values of (T1) and (T2) differ depending on various factors, the configuration is such that the optimal setting value can be adjusted according to the application and purpose.

(Example 5) FIG. 13 shows a fifth embodiment as another typical example. This is a case where the circuit configuration (14) of the present invention is realized without using the comparison circuit 2 (17) in the fourth embodiment shown in FIG. The communication circuit reset signal (v-clr) (111) is output from the comparison circuit 1 (16). FIG. 14 shows an operation timing chart of the fifth embodiment. In this case, since the comparison value 1 (114) is only (M), only the time setting of (T1 = T2) is performed. In the fifth embodiment, the setting is simple because the setting value is only M and the time settings (T1) and (T2) are only (T1 = T2). In this example, when the comparison circuit 1 (16) detects a match between the comparison value 1 (114) and the counter value 1 (113) with the flag 1 (115) raised, the communication unit reset signal (111) is output. When the comparison circuit 1 (16) detects a match between the comparison value 1 (114) and the counter value 1 (113) in a state where the flag 1 (115) is not raised, a signal for raising the flag 1 (115) is selected. Output.

Further, as shown in FIG. 14, the counter circuit 1 (15) outputs the signal from the comparison circuit 1 (16) (“1” if the flag 1 (115) is raised) until the vertical synchronization signal (110) is input. , The communication state (ve-cnt) (119) is counted up to "2", "3", "4",... Each time the communication unit reset signal (111) is input. However, the typical circuit configuration shown in FIG. 13 shows a typical circuit configuration in which the comparison function is assigned to only a single comparison circuit (comparison circuit 1). The comparison circuit 1 is provided with comparison value selection means for sequentially changing the setting of the comparison value at the time of (T1) counting and at the time of (T2) counting, so that the time (T1) and the time (T2) shown in FIG. It is also possible to arbitrarily set the time variably.

FIG. 15 is a timing chart for explaining another exemplary operation of the fifth embodiment shown in FIG. In the operation according to the timing chart in FIG. 15, the time (T1) for recognizing the communication failure state and the time from when the communication failure state occurs until the communication unit is actually reset by the communication unit reset signal (v-clr) (111). (T2) is merged into a set time (T1) of 1, and the time (T1) is detected from the vertical synchronization signal (V). That is, the counter value 1 (113) matches the comparison value 1 (114). Then, the comparison circuit 1 (16) recognizes the communication failure state, raises the flag 1 (verr-a) (115), and outputs the communication unit reset signal (v-clr) (111).

Here, the operation details related to the time charts shown in FIG. 12, FIG. 14, and FIG. 15 will be compared and described. As shown in FIG. 12, the time (T1) from the normal state to the determination of the communication failure state and the time from the recognition of the communication failure state to the output of the first communication unit reset signal (v-clr). When the time (T2) can be individually set independently (pattern 1), as shown in FIG. 14, the time (T1) and the time (T2) can be set to the same value (only the same comparison value 1 is used). (Pattern 2) and the case where only (T1) can be set as shown in FIG. 15 (Pattern 3).

If the setting of the time (T1) is equal to or less than the cycle (V) (T1 ≦ V), the communication failure state is determined even in the normal state. Therefore, the time setting of (T1) is larger than the VSYNC cycle (V) ( T1> V). (V) is also a switching cycle of the screen display, and this cycle (V) changes the optimum setting time depending on the display contents such as scrolling and the number of connection stages. Therefore, in order to handle various types of images by the same circuit, it is preferable that the time setting of (T1) be variable in accordance with a setting change such as the cycle (V). If the period (V) is always constant, the time setting of (T1) is set to a value as close as possible to (V) in order to reduce the time until recovery, that is, to start the recovery operation as quickly as possible. Is preferred. Usually, during a steady display operation in communication including a display or the like, the operation is often performed at a constant period (V). Therefore, in this case, the (T1) time setting larger than the cycle (V) and as close to the cycle (V) as possible is the most preferable set time value (T1).

(T2) is the time from when the communication failure state is recognized to when the first communication unit reset signal (v-clr) is output, but in order to secure a margin until the communication unit is initialized (reset). For example, when a large amount of data that requires a time longer than the cycle (V) other than the display data is transmitted even once, the time (T1) is used unless the set time (T2) is provided. Only when the synchronization signal (V) is not input and received, the communication unit reset signal (v-clr) is output immediately, that is, at the same time that the communication unit reset signal (v-clr) is determined as a communication failure state. clr) is output and the communication unit reset signal (v-clr) is inserted in the received signal, preventing normal data reception. Therefore, set a sufficient margin (T2) for the large data transmission time in this case. By keeping the above More preferred is a corresponding upper to receive the large amount of data takes time, such as to exceed the steady period (V) Una. When there is a possibility that (V) may be intentionally increased in a case where a large amount of data is sent on the controller side, it is appropriate to set (T2) for the margin. This is preferable for performing a communication failure recovery operation. If the time (T1) is too large, a large amount of data can be received. However, in the normal state, the time required to determine a communication failure state becomes longer, and the time required for recovery tends to be longer. Absent.

The time (T2) is also the output cycle of the communication unit reset signal (v-clr) which is continuously output until the communication failure state is recovered. If the time (T2) is set to the same value as the cycle (V), VSYNC The communication unit reset signal (v-clr) may be input and received in synchronization with the reception of the synchronization signal (V). In this case, the normal reception of the VSYNC synchronization signal (V) may not be possible. In this sense, it is more preferable to set a different value between (T2) and the cycle (V) because the reception timing of the VSYNC synchronization signal (V) and the input timing of the communication unit reset signal (v-clr) can be shifted.

From these facts, it is possible to set the optimal values of the time (T1) and (T2) in the (pattern 1). For example, when the VSYNC cycle (V) is changed for scroll speed adjustment by scroll display or the like, or when the unit connection is performed. It can be said that this is one of the most preferable modes because it is possible to make optimal settings corresponding to various display methods such as when it is desired to increase the number of steps. Further, in the (pattern 2), the time (T1) and (T2) can be set only to the same setting (T1 = T2). For example, it is necessary to set (T1), which is larger than the period (V), of the two values (T1) and (T2) of the above setting as a common setting value of (T1) and (T2) in the margin setting. Although preferable in terms of meaning, in this case, the total time setting of the times (T1) and (T2) tends to be large, that is, the time until the recovery is long and the time tends to be long. On the other hand, the circuit configuration of (pattern 2) shown in FIG. 13 is relatively simpler and simpler than that of (pattern 1) shown in FIGS. 11 and 16, so that various settings and maintenance are easy. In addition, there is an advantage that wiring can be reduced. Further, not only the circuit configuration of (pattern 3) is simpler than that of (pattern 1), but also the circuit operation itself is simpler than that of (pattern 2) as shown in FIG. In this (pattern 3), since the time (T2) is not set, communication data transmitted / received in a time shorter than the time (T1), that is, communication data transmitted / received in each cycle (V) smaller than the time (T1) This is particularly effective when only communication and handling are performed.

FIG. 16 shows another sixth embodiment relating to the circuit of the present invention. The exemplary embodiment 6 is a case where the set times (T1) and (T2) are set to fixed values (160) without having the rewritable storage device (18). This fixed value (160) can be set and held as an initial setting value in the comparison circuits (16, 17) and the like. As the fixed value (160), it is necessary to provide a storage device unless the values of the set times (T1) and (T2) are empirically determined in advance and the controller does not need to know a communication failure that has occurred in the past. There is no need for resetting or re-adjustment as long as only the set times (T1) and (T2), which are known in advance, or one of them is initially set. Only one of the set times (T1) and (T2) may be a fixed value, and the other may be stored in a rewritable storage device.

The transfer time Tp of the VSYNC synchronization packet described in this specification is set to 2.56 μs, the transfer cycle (V) of the VSYNC synchronization packet is set to 30 to 120 Hz, and (T1) + (T2) (only T1 in the operation of FIG. 15). Is set in the range of 33.2 ms to 2 s, and it is confirmed that resetting and smooth resynchronization between the controller and the unit or between the controller and the distribution board is possible even when synchronization is lost, and that communication is restored. ing. In the embodiment using the storage device which can change the period (V) of the vertical synchronization signal and the set value, the time set value of (T1 + T2) can be controlled by the controller.

In this embodiment having no storage device, the communication state (ve-cnt) (119) is bidirectionally communicated in real time via the communication unit (13) without holding the communication state in the storage device. It can be monitored and monitored on the controller side. It is desirable that the controller be installed on the operator side, such as a display control room, separately from the display main body. For example, even when a display is installed in a place where danger is imposed on the presence of an operator, such as in a building or on a rooftop, the operator always keeps the display on the display in a safe place such as the controller room. In addition to data control, it is possible to monitor and control in real time the control up to recovery related to communication failures, etc., using a control computer (PC, office computer, etc.) at hand. As for monitoring on the monitor side, that is, on the operator side or the controller side, it is needless to say that a storage device or the like can be provided on the monitor side as necessary to record the communication state.

FIG. 1 is a detailed block diagram according to an embodiment of the present invention. FIG. 2 is an operation timing chart explanatory diagram according to an embodiment of the present invention. FIG. 3 is a block diagram of a 4 × 4 LED unit showing an embodiment of the present invention. FIG. 4 is a schematic diagram of a circuit configuration in the LED unit. FIG. 5 is a schematic diagram showing a configuration of an LED display shown for comparison with the present invention. FIG. 6 is a schematic diagram of an LED display block configuration and an LED unit circuit according to a second embodiment of the present invention. FIG. 7 is a schematic diagram of a configuration of an LED unit according to a third embodiment of the present invention and a schematic diagram of a circuit configuration in the unit. Configuration schematic diagram of the LED unit internal circuit of FIG. Configuration schematic diagram of the LED unit internal circuit of FIG. FIG. 10 is an explanatory diagram of an operation timing chart of the circuit of FIG. 8 according to the second embodiment of the present invention. FIG. 11 is a schematic circuit diagram of a fourth embodiment relating to the circuit of the present invention. FIG. 12 is an operation timing chart of a circuit according to a fourth embodiment of the present invention. FIG. 13 is a schematic circuit diagram of a fifth embodiment relating to the circuit of the present invention. FIG. 14 is an explanatory diagram of an operation timing chart of the fifth embodiment. FIG. 15 is an explanatory diagram of another embodiment of the operation timing chart of the fifth embodiment. FIG. 16 is a schematic circuit diagram of a sixth embodiment relating to the circuit of the present invention. FIG. 17 is a conceptual block diagram showing an embodiment of the present invention.

Explanation of reference numerals

11, 41, 811, 172 receiving circuit, 12, 42, 810, 173 transmitting circuit, 13, 89, 174 communication section, 45, 175 communication means, 14, 46, 86 ... circuit of the present invention, 15 ... counter circuit 1, 16 ... comparison circuit 1, 17 ... comparison circuit 2, 18 ... storage device, 19 ... read clear signal (reg-clr) ), 110: vertical synchronization signal (vstart), 111: communication unit reset signal (v-clr), 112: communication failure information (verr-b), 113: counter value (vcount), 114: Comparative value 1 (M), 115: Flag 1 (verr-a), 116: Comparative value 2, 31, 43, 502: LED unit, 32: LED unit block 33 ... Communication signal connector , 34 ... 8-core flat LAN cable, 35 ... LED unit controller, 44 ... LED driver control IC (LED drive circuit), 47 ... Unit storage device, 48 ... Driver IC control Circuit, 49 LED driver IC, 501 LED display, 504 distributor, 505 shift register circuit, 510 full color video data for display, 520 various control signals, 61 ... LED display block, 62 ... LED unit, 63, 74 ... LED driver IC, 64 ... LED driver control IC, 65 ... Built-in RAM, 66 ... Controller, 67 ...・ LVDS-LVCMOS conversion circuit, 68 ・ ・ ・ General-purpose LAN cable for full duplex bidirectional packet communication, 69 ・ ・ ・ Dry IC transfer format, 610: display / control data between LED units, 611: full-duplex bidirectional packet communication general-purpose LAN cable, 71: controller, 72: distribution board, 73: unit 75, LED unit-distribution board display data, 76, 77 LAN cable, 81 dot matrix LED panel, 82 common driver circuit, 83 LED driver control IC, 84 ... LED driver IC, 85 ... EEPROM for control data, 87 ... Image data memory A, 88 ... Image data memory B, 117 ... Clock signal (clk), 118 ... Reset signal (Xreset), 119: communication state (ve-cnt), 160: fixed value setting means for comparison value, 170 - first detection means, 171 ... second detection means

Claims (89)

A communication control device having communication means for communicating data between a controller that supplies a control signal for the display unit and the display unit or / and between the display units,
A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
A comparison circuit that compares a count value counted by the counter circuit with a preset comparison value (M), detects a match between the comparison value (M) and the count value, and determines a communication failure state. A communication control device characterized by the above-mentioned. A communication control device having communication means for communicating data between a controller that supplies a control signal for the display unit and the display unit or / and between the display units,
A communication control device, comprising: a first detection unit that detects a predetermined period (T1) from a signal (V) input to the communication unit at a predetermined period and determines that a communication failure state has occurred. The communication control device according to claim 1, further comprising a communication status information storage unit configured to store the communication failure status. 4. The communication control device according to claim 1, wherein the signal (V) input at a constant cycle is a vertical and / or horizontal synchronization signal. 5. A communication control device having communication means for communicating data between a controller that supplies a control signal for the display unit and the display unit or / and between the display units,
A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
A first comparison circuit that compares the count value counted by the counter circuit with a first comparison value set in advance and detects a match between the first comparison value and the count value to determine a communication failure state; ,
The count value counted by the counter circuit initialized by the detection signal for determining the communication failure state is compared with a preset second comparison value, and the coincidence between the second comparison value and the count value is determined. And a second comparing circuit for detecting a signal and outputting a signal for resetting the communication means. A communication control device having communication means for communicating data between a controller that supplies a control signal for the display unit and the display unit and / or between the display units;
A first detecting means for detecting a predetermined period (T1) from a signal (V) inputted to the communication means at a constant cycle to determine a communication failure state; A communication control device, comprising: a second detecting means for detecting a predetermined period (T2) of the communication means and outputting a signal for resetting at least the receiving means and the transmitting means of the communication means. The communication control device according to claim 5, further comprising a communication status information storage unit configured to store the communication failure status. 8. The communication control device according to claim 5, wherein the signal (V) input at a constant cycle is a vertical and / or horizontal synchronization signal. 9. The communication state information storage unit that stores the communication failure state is a storage unit that, when a first signal is input from the communication unit, the storage of the communication failure state is deleted, and the first signal 8. The communication control device according to claim 3, wherein the communication control device is a communication device that can be input at any time. An LED display having communication means for communicating data between a controller that supplies a control signal for a display unit and the display unit or / and between the display units,
A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
A comparison circuit that compares a count value counted by the counter circuit with a comparison value (M) input in advance and detects a match between the comparison value (M) and the count value to determine a communication failure state; LED display characterized by the above-mentioned. An LED display having communication means for communicating data between a controller that supplies a control signal for a display unit and the display unit or / and between the display units,
An LED display comprising: a first detection unit that detects a predetermined period (T1) from a signal (V) input to the communication unit at a constant period and determines a communication failure state. The LED display according to claim 10, further comprising a communication state information storage unit configured to store the communication failure state. 13. The LED display according to claim 10, wherein the signal (V) input at a constant cycle is a vertical and / or horizontal synchronization signal. An LED display having communication means for communicating data between a controller that supplies a control signal for a display unit and the display unit or / and between the display units,
A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
A first comparison circuit that compares the count value counted by the counter circuit with a first comparison value set in advance and detects a match between the first comparison value and the count value to determine a communication failure state; ,
The count value counted by the counter circuit initialized by the detection signal for determining the communication failure state is compared with a preset second comparison value, and the coincidence between the second comparison value and the count value is determined. And a second comparison circuit for detecting a signal and resetting the communication means. An LED display having communication means for communicating data between a controller that supplies a control signal for a display unit and the display unit and / or between the display units,
A first detecting means for detecting a predetermined period (T1) from a signal (V) inputted to the communication means at a constant cycle to determine a communication failure state; An LED display for detecting a predetermined period (T2) and outputting a signal for resetting at least the receiving means and the transmitting means of the communication means. The LED display according to claim 14, further comprising a communication status information storage unit configured to store the communication failure status. 17. The LED display according to claim 14, wherein the signal (V) input at a constant cycle is a vertical and / or horizontal synchronization signal. The communication state information storage unit that stores the communication failure state is a storage unit that, when a first signal is input from the communication unit, the storage of the communication failure state is deleted, and the first signal 17. The LED display according to claim 12, wherein is a communication means that can be input at any time. A communication control device having communication means for communicating data between a controller supplying a control signal of the display unit and the distribution board or / and between the display unit and the distribution board;
A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
A comparison circuit that compares a count value counted by the counter circuit with a comparison value (M) input in advance and detects a match between the comparison value (M) and the count value to determine a communication failure state; A communication control device characterized by the above-mentioned. A communication control device having communication means for communicating data between a controller supplying a control signal of the display unit and the distribution board or / and between the display unit and the distribution board;
A communication control device, comprising: a first detection unit that detects a predetermined period (T1) from a signal (V) input to the communication unit at a predetermined period and determines that a communication failure state has occurred. 21. The communication control device according to claim 19, further comprising a communication state information storage unit that stores the communication failure state. 22. The communication control device according to claim 19, wherein the signal (V) input at a constant cycle is a vertical and / or horizontal synchronization signal. A communication control device having communication means for communicating data between a controller supplying a control signal of the display unit and the distribution board or / and between the display unit and the distribution board;
A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
A first comparison circuit that compares the count value counted by the counter circuit with a first comparison value set in advance and detects a match between the first comparison value and the count value to determine a communication failure state; ,
The count value counted by the counter circuit initialized by the detection signal for determining the communication failure state is compared with a preset second comparison value, and the coincidence between the second comparison value and the count value is determined. And a second comparing circuit for detecting a signal and outputting a signal for resetting the communication means. A communication control device having communication means for communicating data between a controller for supplying a control signal of the display unit and the distribution board and / or between the display unit and the distribution board;
A first detecting means for detecting a predetermined period (T1) from a signal (V) inputted to the communication means at a constant cycle to determine a communication failure state; A communication control device, comprising: a second detecting means for detecting a predetermined period (T2) of the communication means and outputting a signal for resetting at least the receiving means and the transmitting means of the communication means. 25. The communication control device according to claim 23, further comprising a communication state information storage unit that stores the communication failure state. 26. The communication control device according to claim 23, wherein the signal (V) input at a constant cycle is a vertical and / or horizontal synchronization signal. The communication state information storage unit that stores the communication failure state is a storage unit that, when a first signal is input from the communication unit, the storage of the communication failure state is deleted, and the first signal 26. The communication control device according to claim 20, wherein is communication means that can be input at any time. An LED display having communication means for communicating data between a controller that supplies a control signal for a display unit and a distribution board or / and between a display unit and a distribution board,
A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
A comparison circuit that compares a count value counted by the counter circuit with a comparison value (M) input in advance and detects a match between the comparison value (M) and the count value to determine a communication failure state; LED display characterized by the above-mentioned. An LED display having communication means for communicating data between a controller that supplies a control signal for a display unit and a distribution board or / and between a display unit and a distribution board,
An LED display comprising: a first detection unit that detects a predetermined period (T1) from a signal (V) input to the communication unit at a constant period and determines a communication failure state. 30. The LED display according to claim 28, further comprising a communication status information storage unit configured to store the communication failure status. 31. The LED display according to claim 28, wherein the signal (V) input at a constant cycle is a vertical and / or horizontal synchronization signal. An LED display having communication means for communicating data between a controller that supplies a control signal for a display unit and a distribution board or / and between a display unit and a distribution board,
A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
A first comparison circuit that compares the count value counted by the counter circuit with a first comparison value set in advance and detects a match between the first comparison value and the count value to determine a communication failure state; ,
The count value counted by the counter circuit initialized by the detection signal for determining the communication failure state is compared with a preset second comparison value, and the coincidence between the second comparison value and the count value is determined. And a second comparison circuit for detecting a signal and resetting the communication means. An LED display having communication means for communicating data between a controller that supplies a control signal for the display unit and the distribution board and / or between the display unit and the distribution board,
A first detecting means for detecting a predetermined period (T1) from a signal (V) inputted to the communication means at a constant cycle to determine a communication failure state; An LED display for detecting a predetermined period (T2) and outputting a signal for resetting at least the receiving means and the transmitting means of the communication means. 34. The LED display according to claim 32, further comprising communication status information storage means for storing the communication failure status. 35. The LED display according to claim 32, wherein the signal (V) input at a constant cycle is a vertical and / or horizontal synchronization signal. The communication state information storage unit that stores the communication failure state is a storage unit that, when a first signal is input from the communication unit, the storage of the communication failure state is deleted, and the first signal 35. The LED display according to claim 30 or claim 34, wherein is a communication means that can be input at any time. A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
A comparison circuit that compares a count value counted by the counter circuit with a preset comparison value (M), detects a match between the comparison value (M) and the count value, and determines a communication failure state. A communication control device characterized by the above-mentioned. A communication control device comprising: a first detection unit that detects a predetermined period (T1) from a signal (V) input to the communication unit at a predetermined period and determines that a communication failure has occurred. 39. The communication control device according to claim 37, further comprising a communication status information storage unit configured to store the communication failure status. 40. The communication control device according to claim 37, wherein the signal (V) input at a constant cycle is a vertical and / or horizontal synchronization signal. A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
A first comparison circuit that compares the count value counted by the counter circuit with a first comparison value set in advance and detects a match between the first comparison value and the count value to determine a communication failure state; ,
The count value counted by the counter circuit initialized by the detection signal for determining the communication failure state is compared with a preset second comparison value, and the coincidence between the second comparison value and the count value is determined. And a second comparing circuit for detecting a signal and outputting a signal for resetting the communication means. A first detecting unit for detecting a predetermined period (T1) from a signal (V) input to the communication unit at a constant period to determine a communication failure state; A communication control device comprising: a second detection unit that detects a certain period (T2) and outputs a signal for resetting at least a reception unit and a transmission unit of the communication unit. 43. The communication control device according to claim 41, further comprising a communication state information storage unit that stores the communication failure state. The communication control device according to any one of claims 41 to 43, wherein the signal (V) input at a constant cycle is a vertical and / or horizontal synchronization signal. The communication state information storage unit that stores the communication failure state is a storage unit that, when a first signal is input from the communication unit, the storage of the communication failure state is deleted, and the first signal The communication control device according to claim 39 or claim 43, wherein is a communication means that can be input at any time. In a building comprising an LED display having communication means for communicating data between a controller supplying a control signal for a display unit and the display unit or / and between the display units,
A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
An LED having a comparison circuit that compares a count value counted by the counter circuit with a comparison value (M) input in advance and detects a match between the comparison value (M) and the count value to determine a communication failure state. A building characterized by having an indicator. In a building comprising an LED display having communication means for communicating data between a controller supplying a control signal for a display unit and the display unit or / and between the display units,
A building comprising an LED display having first detection means for detecting a predetermined fixed time period (T1) from a signal (V) inputted to the communication means at a fixed cycle and determining a communication failure state. 48. The building according to claim 36, further comprising an LED display having a communication state information storage unit for storing the communication failure state. 49. The building according to claim 46, wherein the signal (V) input at a constant period includes an LED display that is a vertical and / or horizontal synchronization signal. In a building comprising an LED display having communication means for communicating data between a controller supplying a control signal for a display unit and the display unit or / and between the display units,
A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
A first comparison circuit that compares the count value counted by the counter circuit with a first comparison value set in advance and detects a match between the first comparison value and the count value to determine a communication failure state; ,
The count value counted by the counter circuit initialized by the detection signal for determining the communication failure state is compared with a preset second comparison value, and the coincidence between the second comparison value and the count value is determined. And a second comparator circuit for detecting a signal and resetting the communication means. In a building comprising an LED display having communication means for communicating data between a controller for supplying a control signal for a display unit and the display unit and / or between the display units,
A first detecting means for detecting a predetermined period (T1) from a signal (V) inputted to the communication means at a constant cycle to determine a communication failure state; And a second detecting means for detecting at least a predetermined period (T2) of the communication means and outputting a signal for resetting at least the receiving means and the transmitting means of the communication means. 52. The building according to claim 50, further comprising an LED display having a communication state information storage unit for storing the communication failure state. The building according to any one of claims 50 to 52, wherein the signal (V) input at a constant period includes an LED display that is a vertical and / or horizontal synchronization signal. The communication state information storage unit that stores the communication failure state is a storage unit that, when a first signal from the communication unit is input, erases the storage of the communication failure state, the first signal 53. The building according to claim 48 or 52, further comprising an LED display which is a communication means that can be input at any time. In a building comprising an LED display having communication means for communicating data between a controller supplying a control signal of the display unit and the distribution board or / and between the display unit and the distribution board,
A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
An LED having a comparison circuit that compares a count value counted by the counter circuit with a comparison value (M) input in advance and detects a match between the comparison value (M) and the count value to determine a communication failure state. Building with indicator. In a building comprising an LED display having communication means for communicating data between a controller supplying a control signal of the display unit and the distribution board or / and between the display unit and the distribution board,
A building comprising an LED display having first detection means for detecting a predetermined fixed time period (T1) from a signal (V) inputted to the communication means at a fixed cycle and determining a communication failure state. 57. The building according to claim 55, further comprising an LED display having a communication state information storage unit for storing the communication failure state. The building according to any one of claims 55 to 57, wherein the signal (V) input at a constant period includes an LED display that is a vertical and / or horizontal synchronization signal. In a building comprising an LED display having communication means for communicating data between a controller supplying a control signal of the display unit and the distribution board or / and between the display unit and the distribution board,
A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
A first comparison circuit that compares the count value counted by the counter circuit with a first comparison value set in advance and detects a match between the first comparison value and the count value to determine a communication failure state; ,
The count value counted by the counter circuit initialized by the detection signal for determining the communication failure state is compared with a preset second comparison value, and the coincidence between the second comparison value and the count value is determined. And a second comparator circuit for detecting a signal and resetting the communication means. In a building comprising an LED display having communication means for communicating data between a controller supplying a control signal of the display unit and the distribution board and / or between the display unit and the distribution board,
A first detecting means for detecting a predetermined period (T1) from a signal (V) inputted to the communication means at a constant cycle to determine a communication failure state; And a second detecting means for detecting a predetermined period (T2) of the communication means and outputting a signal for resetting at least the receiving means and the transmitting means of the communication means. 61. The building according to claim 59, further comprising an LED display having communication status information storage means for storing the communication failure status. The building according to any one of claims 59 to 61, wherein the signal (V) input at the constant period includes an LED display that is a vertical and / or horizontal synchronization signal. The communication state information storage unit that stores the communication failure state is a storage unit that, when a first signal from the communication unit is input, erases the storage of the communication failure state, the first signal 63. A building according to claim 57 or claim 61, further comprising an LED display which is a communication means that can be input at any time. A method of driving an LED display having communication means for communicating data between a controller supplying a control signal for a display unit and the display unit or / and between the display units,
A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
A first comparison circuit that compares the count value counted by the counter circuit with a first comparison value set in advance and detects a match between the first comparison value and the count value to determine a communication failure state; ,
The count value counted by the counter circuit initialized by the detection signal for determining the communication failure state is compared with a preset second comparison value, and the coincidence between the second comparison value and the count value is determined. And a second comparator circuit for detecting a signal and resetting the communication means. A method for driving an LED display having communication means for communicating data between a controller that supplies a control signal for a display unit and the display unit and / or between the display units,
A first detecting means for detecting a predetermined period (T1) from a signal (V) inputted to the communication means at a constant cycle to determine a communication failure state; A second detection means for detecting a predetermined period (T2) of the communication means and outputting a signal for resetting at least the reception means and the transmission means of the communication means. 66. The driving method of an LED display according to claim 64, further comprising a communication state information storage unit for storing the communication failure state. 67. The driving method of an LED display according to claim 64, wherein the signal (V) input at a constant cycle is a vertical and / or horizontal synchronization signal. A method for driving a communication control device having communication means for communicating data between a controller that supplies a control signal for a display unit and a distribution board or / and between a display unit and a distribution board,
A counter circuit whose count value is initialized by a signal (V) input to the communication means at a constant cycle;
A first comparison circuit that compares the count value counted by the counter circuit with a first comparison value set in advance and detects a match between the first comparison value and the count value to determine a communication failure state; ,
The count value counted by the counter circuit initialized by the detection signal for determining the communication failure state is compared with a preset second comparison value, and the coincidence between the second comparison value and the count value is determined. And a second comparison circuit for detecting a reset and outputting a signal for resetting the communication means. A method for driving a communication control device having communication means for communicating data between a controller supplying a control signal of a display unit and a distribution board and / or between a display unit and a distribution board,
A first detecting means for detecting a predetermined period (T1) from a signal (V) inputted to the communication means at a constant cycle to determine a communication failure state; A second detection means for detecting a predetermined period (T2) of the communication means and outputting a signal for resetting at least the reception means and the transmission means of the communication means. 70. The driving method for a communication control device according to claim 68, further comprising a communication state information storage unit that stores the communication failure state. 71. The method of driving a communication control device according to claim 68, wherein the signal (V) input at a constant cycle is a vertical and / or horizontal synchronization signal. An LED composed of a plurality of LED units (31) cascaded via a communication signal connector (33) to enable full-duplex or / and half-duplex bidirectional packet communication (34) from the LED unit controller (35). In the LED display including the unit block (32),
At least the LED unit (31) is electrically connected to a communication unit (13) having a reception circuit (11) and a transmission circuit (12) so that a vertical synchronization signal (110) is input from the reception circuit (11). The calculated counter circuit (15) is compared with the counter value 1 (113) of the counter circuit (15) and a preset comparison value 1 (114). The comparison circuit 1 (16) that outputs a flag 1 (115) when the reset signal is input to the storage device (18) and the counter circuit 1 (15) that is electrically connected to the counter circuit 1 (15) ) Is provided with a protection circuit including a comparison circuit 2 (17) that outputs a communication unit reset signal (111) if the counter value matches a preset comparison value 2 (116). LED indicators that. The storage device (18) is electrically connected to the communication unit (13), and stores communication failure information (verr-b) (112) including the flag 1 (115) stored in the storage device (18). The communication unit (13) arbitrarily reads and a read clear signal (19) from which the communication failure information (verr-b) (112) in the storage device (18) can be erased from the receiving circuit (11). 73. The LED display according to claim 72, which is a storage device. A plurality of distribution boards (72) cascaded so as to enable full-duplex bidirectional packet communication (76) from the LED controller (71), and LED units (radially connected to the distribution boards (72) via star wiring). 73) An LED display comprising:
At least the distribution board (72) is electrically connected to a communication unit (13) having a reception circuit (11) and a transmission circuit (12) so that a vertical synchronization signal (110) is input from the reception circuit (11). The calculated counter circuit (15) is compared with the counter value 1 (113) of the counter circuit (15) and a preset comparison value 1 (114). The comparison circuit 1 (16) that outputs a flag 1 (115) when the reset signal is input to the storage device (18) and the counter circuit 1 (15) that is electrically connected to the counter circuit 1 (15) ) Is compared with a preset comparison value 2 (116), and if they match, a protection circuit including a comparison circuit 2 (17) that outputs a communication unit reset signal (111) is provided. ED indicator. The storage device (18) is electrically connected to the communication unit (13), and stores communication failure information (verr-b) (112) including the flag 1 (115) stored in the storage device (18). The communication unit (13) arbitrarily reads and a read clear signal (19) from which the communication failure information (verr-b) (112) in the storage device (18) can be erased from the receiving circuit (11). 75. The LED display according to claim 74, which is a storage device. In the storage device (18), a communication state (ve-cnt) (119) indicating the count status from the counter circuit 1 (15) is input to and stored in the storage device (18), and the predetermined setting is performed. 76. The LED display according to claim 72, wherein the comparison value 1 (114) and the preset comparison value 2 (116) are set and held in the storage device (18). An LED composed of a plurality of LED units (31) cascaded via a communication signal connector (33) to enable full-duplex or / and half-duplex bidirectional packet communication (34) from the LED unit controller (35). In the LED display including the unit block (32),
At least the LED unit (31) is electrically connected to a communication unit (13) having a reception circuit (11) and a transmission circuit (12) so that a vertical synchronization signal (110) is input from the reception circuit (11). The calculated counter circuit (15) is compared with the counter value 1 (113) of the counter circuit (15) and a preset comparison value 1 (114). And a protection circuit comprising a flag 1 (115) input to the storage device (18) and a comparison circuit 1 (16) for selectively outputting the communication unit reset signal (111). LED display. The storage device (18) is electrically connected to the communication unit (13), and stores communication failure information (verr-b) (112) including the flag 1 (115) stored in the storage device (18). The communication unit (13) arbitrarily reads and a read clear signal (19) from which the communication failure information (verr-b) (112) in the storage device (18) can be erased from the receiving circuit (11). The LED display according to claim 77, which is a storage device. A plurality of distribution boards (72) cascaded so as to enable full-duplex bidirectional packet communication (76) from the LED controller (71), and LED units (radially connected to the distribution boards (72) via star wiring). 73) An LED display comprising:
At least the distribution board (72) is electrically connected to a communication unit (13) having a reception circuit (11) and a transmission circuit (12) so that a vertical synchronization signal (110) is input from the reception circuit (11). The calculated counter circuit (15) is compared with the counter value 1 (113) of the counter circuit (15) and a preset comparison value 1 (114). And a protection circuit comprising a flag 1 (115) input to the storage device (18) and a comparison circuit 1 (16) for selectively outputting the communication unit reset signal (111). LED display. The storage device (18) is electrically connected to the communication unit (13), and stores communication failure information (verr-b) (112) including the flag 1 (115) stored in the storage device (18). The communication unit (13) arbitrarily reads and a read clear signal (19) from which the communication failure information (verr-b) (112) in the storage device (18) can be erased from the receiving circuit (11). 80. The LED display according to claim 79, which is a storage device. In the storage device (18), a communication state (ve-cnt) (119) indicating the count status from the counter circuit 1 (15) is input to and stored in the storage device (18), and the predetermined setting is performed. 81. The LED display according to claim 77, wherein the comparison value 1 (114) and the preset comparison value 2 (116) are set and held in the storage device (18). A communication unit (174) including at least a transmission circuit (173) and a reception circuit (172); and a signal (V) having a constant period input from the communication unit (174) and a predetermined time (T1) from the signal (V). ), A detection signal connected to the first detection means for detecting the predetermined time (T1) is inputted, and a predetermined signal is inputted after the detection signal is inputted. A communication control device comprising: a second detection unit (171) that detects a time (T2) and outputs a reset signal of a communication unit (175) including at least the communication unit (174). An LED drive communication control circuit that detects that a vertical or horizontal synchronization signal input at a fixed period has not been received for a certain fixed period in communication between the display LED unit or the display LED controller and the display LED unit. 84. The communication control circuit for driving an LED according to claim 83, wherein the predetermined period in which the vertical or horizontal synchronization signal input in the predetermined period is not received can be adjusted. When the vertical or horizontal synchronization signal input at the fixed period is detected not to be received for a certain period or more, a communication state information storage device capable of determining a communication failure state and storing the information is provided. The LED drive communication control circuit according to claim 84. 86. The communication control circuit for driving an LED according to claim 85, further comprising resetting at least a reception circuit and a transmission circuit inside the communication unit when a certain period of time has elapsed after the communication failure state. 89. The LED drive communication control circuit according to claim 86, wherein a predetermined period of time from when the communication failure occurs to at least reset of the reception circuit and the transmission circuit inside the communication unit can be adjusted. 88. The communication control circuit for driving an LED according to claim 87, further comprising a function of recovering from the communication failure state to a normal operation state when a signal is detected in the communication failure state. 86. The LED drive communication according to claim 85, wherein the communication state information storage device storing the communication failure state information has a function of retaining the communication failure state information storage after the communication state is restored until a read clear signal is input. Control circuit.

Images