JPH06214524A - Information display device - Google Patents

Abstract

PURPOSE:To prevent one defective display unit from affecting the display contents of an other display unit. CONSTITUTION:A pair of an address signal from a display information display device sent through a signal transmission line provided at every display unit independently with the display information corresponding to the address signal is detected by a control part 10, and when the address signal addressed to oneself is detected, the data becoming a pair with the address signal are fetched, and the display unit 1 is displayed by the data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information display device for displaying predetermined information by selectively emitting light from a plurality of display elements such as light emitting diodes.

[0002]

2. Description of the Related Art Conventionally, there is an information display device in which display dots are arranged vertically and horizontally in a matrix form and the display dots are displayed by dot-spacing, and they are used for, for example, traffic information boards and advertising boards. In recent years, as a light-emitting element for displaying in a dot-striped manner, an increasing number of light-emitting elements that use a light-emitting diode that requires almost no maintenance are being used in place of a lamp that requires frequent maintenance.

Since a light emitting diode can be used to make the shape small, as shown in FIG. 6, a plurality of light emitting diodes are integrated to form a display unit 1, and a plurality of the display units are connected in a chain. The inside of the display unit 1 is serial-parallel converted by a shift register shift register for fetching display information sent serially as shown in FIG. 7, and the data parallel-converted by the shift register shift register each light-emitting diode via a latch circuit and a drive circuit. To be supplied to.

The data serially supplied is pushed out in the output direction of the shift register every time the data is supplied, so that it is eventually supplied to the adjacent display unit 1 and is taken in there. In this way, when the data is taken in by all the display units, only a predetermined part of the plurality of display units emits light, and the display as shown in FIG. 8 is performed.

[0005]

However, in such a conventional device, since each display unit is in a chain shape, the output side connector of the second display unit is defective, as shown by a cross mark in FIG. 9, for example. Then, the display data cannot be transmitted to the subsequent display units. In this case, the display information is normally sent up to the second display unit, but the display information is sent to the subsequent display units. Absent.

For this reason, as shown in FIG. 10, the two display elements are turned on, but the other display elements are not turned on. Therefore, there is a problem that the displayed information is meaningless depending on the position of the defective connector. Was.

The present invention has been made in view of the above circumstances, and is intended to prevent a defect of one display unit from affecting the display contents of another display unit.

[0008]

[Means for Solving the Problems]

In order to solve such a problem, a first aspect of the invention is to provide a signal transmission line independently provided for each display unit,
A display information sending device that supplies a different address signal for each display unit and the display information supplied to the display unit corresponding to the address signal to the signal transmission path, and the address signal when the address signal addressed to itself is detected. And a control unit for taking in the data sent as a pair and displaying the data according to the information taken in by the display unit.

According to a second aspect of the invention, in the first aspect of the invention, the display information transmitting apparatus is configured to simultaneously supply the same content information to all signal transmission paths.

A third invention is the same as the first invention or the second invention, wherein the signal transmission path uses optical transmission.

[0012]

According to the first aspect of the present invention, the control section detects a pair of the address signal from the display information display device and the display information corresponding to the address signal sent through the signal transmission path provided independently for each display unit. , When the address signal addressed to itself is detected, the data paired with the address signal is fetched and the display unit is displayed by the data.

According to a second aspect of the present invention, in the first aspect, the information sent from the display information sending device has the same contents simultaneously sent to all signal transmission paths, and the display unit side selects only the self-applied information. Information, and do not import information for other display units. In the third invention, the display data is sent by optical space transmission.

[0014]

FIG. 1 is a block diagram showing an embodiment of the device of the present invention. Only three display units 1 are shown as an example because of space limitations. A plurality of 1's are arranged vertically and horizontally. Further, the same parts as those of the conventional one are denoted by the same symbols.

In FIG. 1, a display unit 1 in which a plurality of light emitting diodes are configured to display display information by dot-spacing
As described above, a plurality of display data signals are provided from the light emitter 10a provided in the control unit 10 to the space.
As a result of the transmission of the display data signal in the optical space, the display data having the same content simultaneously reaches all of the display units 1 and is received by the light receiver 1a.

The display data signal sent at this time is a set of address data and display data as shown in FIG. 2, and the address data is uniquely assigned to each display unit. Then, when a set of address data of a specific display unit and a display data for displaying on that display unit, for example, a set of signals indicated by the symbol "a" in the case of FIG. A set of address data and display data to be displayed on the display unit, for example, a set of signals indicated by the symbol "b" is transmitted.

In this way, the display data for displaying each display unit is serially sent from the light emitter 10a of the control unit 10 in pairs with the address signal unique to the display unit. This signal is received by all the display units at the same time, but each display unit has a light receiver 1a therein as shown in FIG. 3, and the signal received inside the light receiver 1a is addressed to itself. It is determined whether the address is

In this case, when it is determined that the address signal is addressed to itself, the display data following the address signal is supplied to the serial / parallel conversion circuit 1b and the error detection circuit 1c. The error detection circuit 1c checks whether or not the supplied display data has an error by a well-known method such as a parity check or a CRC check. On the other hand, the parallel / serial conversion circuit 1b
Converts the supplied serial format signal into a parallel format signal and supplies the parallel format signal to the latch circuit 1d.
It is returned as control data to the control unit 10 via g.

The display data converted into parallel data is latched by the latch circuit 1d, and the portion determined by the display data in the light emitting diode group 1f is caused to emit light via the drive circuit 1e. Note that the display data is fetched and latched by a predetermined clock signal, but the timing of the clock signal is not the gist of the present invention, so the description thereof is omitted.

When the error detection circuit 1c determines that there is an error, the error detection circuit 1c determines that the drive circuit 1
a blocking signal is sent to the latch circuit 1d.
It regulates not to output the signal supplied from.

The signal output from the light emitter 1g is the control unit 1
Light is received by the light receiver 10b of 0, and it is monitored whether or not accurate control is performed inside the control unit 10. The display data signal sent from the control unit 10 is also supplied to other display units in common, but as a result of the other display unit judging that the address signal is not addressed to itself, it does not fetch the display data. , No state change occurs.

However, since the control unit 10 sequentially outputs the display data signal for each display unit, the display data is eventually sent to all the display units and a predetermined display is performed. Here, for example, when it is determined that the connector of the third display unit is defective or the received data is incorrect, that portion is not displayed as shown in FIG. 5, but other portions are normally displayed. It If even one of the display units does not light up, the display contents may be difficult to see compared to the display state when everything is normal.
There is no problem in such a state. Moreover, since a considerable number of display units are used, it is very rare that the entire display contents cannot be grasped at all even if a few display units are not displayed.

In the above embodiment, the spatial data transmission line is used as the display data signal transmission line, but an optical fiber cable may be used. In that case, for example, as shown in FIG.
The light emitted from the light emitter 10a may be diffused by the diffusing device 11, and the diffused light may be evenly incident on the optical fiber cables 12 provided independently for all the display units.

When the display data signal is transmitted by the optical fiber cable as described above, unlike the wired transmission, it is not necessary to consider the delay time due to the distributed capacity, and it is not necessary to provide an interface for each display unit.
Further, the noise resistance is improved as compared with the optical space transmission. In addition,
In FIG. 3, the dotted line portion is a portion that can be integrated into an IC.

[0025]

As described above, according to the first aspect of the invention, the signal transmission path provided independently for each display unit is used to send out the data in which the address signal and the display data are paired, and each display unit is Since the display data is displayed only when the address signal addressed to itself is supplied, even if there is a problem in one display unit, the other display units have the effect of being able to display normally.

In the second aspect of the invention, the same display information is sent out to all the signal transmission paths at the same timing, so that switching for selecting individual display units is not necessary and the structure is simple. Have.

The third aspect of the invention has an effect that the transmission line becomes unnecessary because the display information is transmitted by the optical space transmission.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a state in which address data and display data are transmitted as a pair.

FIG. 3 is a block diagram showing the inside of a display unit.

FIG. 4 is a diagram showing an example in which an optical fiber cable is used for a signal transmission line.

FIG. 5 is a diagram showing a display example when one display unit has a defect.

FIG. 6 is a block diagram showing an example of a conventional device.

7 is a block diagram showing an internal configuration of the display unit of FIG.

FIG. 8 is a diagram showing an example of display contents that are normally displayed on a conventional device.

FIG. 9 is a diagram showing a state when the connector is defective in the conventional device.

FIG. 10 is a diagram showing a display state when a defect in the state of FIG. 9 occurs in the conventional device.

[Explanation of symbols]

 1 display unit 1a light receiver 1b serial / parallel conversion circuit 1c error detection circuit 1d latch circuit 1e drive circuit 1f light emitting diode group 10 control unit 10a light emitter 10b light receiver

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[Procedure amendment]

[Submission date] June 22, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

Since a light emitting diode can be used to make the shape small, as shown in FIG. 6, a plurality of light emitting diodes are integrated to form a display unit 1, and a plurality of the display units are connected in a chain. Inside of the display unit 1 performs serial-parallel conversion by the write-free shift register takes the display information sent to the serial as shown in Figure 7, where the parallel-converted data in each emission through the latch circuit and the driving circuit It is designed to be supplied to the diode.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012]

According to the first aspect of the invention, the control section detects the pair of the address signal from the display information display device and the display information corresponding to the address signal, which is sent via the signal transmission path independently provided for each display unit. , When the address signal addressed to itself is detected, the data paired with the address signal is fetched and the display unit is displayed by the data.

Claims (3)

[Claims] 1. An information display device comprising a display unit comprising a plurality of display elements, a plurality of the display units being provided to constitute a display device, and displaying predetermined information by sequentially supplying display information to each display unit. In the above, a signal transmission line independently provided for each display unit, a display for supplying a pair of address signals different for each display unit and display information supplied to the display unit corresponding to the address signal to the signal transmission line An information display device comprising: an information transmission device; and a control unit that, when an address signal addressed to itself is detected, takes in data sent in pair with the address signal and displays the data in accordance with the information taken in by the display unit. . 2. The information display device according to claim 1, wherein the display information transmitting device is configured to simultaneously supply information of the same content to all signal transmission paths. 3. The information display device according to claim 1 or 2, wherein the signal transmission path is optical transmission.