JP3323953B2 - Information display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a light emitting diode.
Display elements are arranged in a matrix in a horizontal and vertical matrix.
Alternatively, multiple display units that display figures
Connected in series, and the control unit
The desired information is transmitted by sequentially transmitting the serial input signals of
The present invention relates to an information display device for displaying information on each display unit .

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, in consideration of manufacturability and maintainability, a display unit of an information display device 1 is constituted by a plurality of display units 2 and the display unit is provided. 2, a plurality of light emitting diodes 3 are arranged in a matrix in a vertical and horizontal direction as shown in FIG. FIG. 6 is a block diagram showing the configuration of the display unit 2. The display unit 2 is connected to an adjacent display unit by a connector 4 for connection.
When the serial display data (serial input signal) is input from the connector 41, the data is supplied to the shift register circuit 5 (first shift register circuit). The shift register circuit 5 takes in serial display data and outputs a serial output signal and a parallel output signal.

The serial output signal of the shift register circuit 5 is supplied to the shift register circuit 5 at the next stage, and the parallel output signal is supplied to the latch drive circuit 6 and held there, where the light emitting diode connected as a load is provided. 3 is driven. The shift register circuit 5 and the latch / drive circuit 6 reduce the number of assembling steps to improve economy and improve reliability.
Often, both circuits are integrated into an IC. Here, in FIG. 6, a shift clock for shifting a serial signal, a latch signal for storing data in the latch drive circuit 6, and the like are well known, and therefore description and description thereof are omitted.

[0004]

In FIG. 6, the shift register circuit 5 and the latch drive circuit 6 usually have one
Since a data processing capability of about 6 bits is required, the display unit 2 as a whole is required to have a capability of transferring and storing data of about 256 bits, and the shift register circuit 5 and the latch drive circuit 6 each have a capacity of 16 bits. You need them individually. When the electronic circuit is configured by an IC, the failure rate decreases, but the failure rate takes a certain value instead of zero.
Since a large number of shift register circuits 5 and latch / drive circuits 6 are used in the entire information display device, the failure rate of the device increases as the number of used IC devices increases even if the device is integrated. Further, if even one of the shift register circuits 5 fails, data cannot be supplied to the adjacent subsequent shift register circuit 5, so that the subsequent parts cannot be displayed. Further, when any one of the shift register circuits is destroyed due to a lightning surge or the like, display data supplied to the next-stage shift register circuit becomes abnormal, and the subsequent display may become abnormal. Further, since the shift register circuit 5 is soldered to the printed circuit board, if there is a soldering defect even at one location, the display data is not transferred to the next stage shift register circuit 5 and the subsequent portions can be displayed. Disappears. The shift register circuit 5 and the latch
An integrated drive circuit 6 improves economy, but has a problem that the heat generation is increased and the failure rate is increased. As described above, there is a problem that the display reliability of the entire device is reduced when the internal circuit is integrated into an IC to improve the economic efficiency. The present invention has been made in view of such a situation, and has been made to improve economy and not to reduce reliability.

[0005]

In order to solve such a problem, an information display device according to the present invention comprises a plurality of display elements.
Based on serial input signal with several light emitting diodes
Multiple tables for arbitrarily controlling the display state of each light emitting diode
Display unit is connected in series to the control unit, and
These serial input signals for each display unit are transmitted sequentially.
Information to display desired information on each display unit.
Information display device, serial input to each display unit
By sequentially shifting the signal,
Display that outputs a parallel signal to control the display state
A first shift register circuit for control; and a first shift register circuit.
The same number of shift stages as the register circuit
Shifts the signal sequentially and has the same format as the serial input signal
By outputting the serial output signal of
Signal for transmitting a force signal to a display unit at the subsequent stage.
2 shift register circuit and command signal supplied from control unit
The first shift register circuit outputs
From the first serial output signal and the second shift register circuit
The second serial output signal is compared with the second output signal, and both signals are compared.
If the contents of the second serial output signal match, the second serial output signal
Transmitted as a serial output signal from the display unit,
The second serial output signal if the signal contents do not match
The signal inverted from the logic of
And a signal processing circuit for sending out
When detecting abnormalities in each display unit, the
Command signal to each display, and each display connected in series
Imported from the last display unit of the unit
The serial output signal and the serial
Output signal, and if there is a mismatch, an abnormal table is displayed.
The display unit is detected.

[0006]

Therefore, in each display unit, the control unit
The serial input signal from the first shift register circuit
And are sequentially shifted to the table of each light emitting diode.
Output as a parallel signal to control the display state.
You. The serial input signal is output to the second shift register circuit.
To the display unit at the subsequent stage.
Sent to the client. In the signal processing circuit, command signals are sent from the control unit.
Output from the first shift register circuit when the signal is supplied
First serial output signal and second shift register
Is compared with the second serial output signal output from the circuit.
When the contents of both signals match, the second serial output
Signal as a serial output signal from the display unit.
Transmitted, and when the contents of both signals do not match, the second serial
The output signal of the display unit
Is sent out as a serial output signal. Each display unit
When detecting abnormalities in the unit, a command is issued to each display unit.
A signal is supplied from the control unit. Then, the control unit
The last display unit of each connected display unit
To the serial output signal and display units
Is compared with the serial output signal sent to
, An abnormal display unit is detected.

[0007]

FIG. 1 is a block diagram showing an embodiment of the present invention. The same parts as those in FIG. The shift register circuit 7 connected between the connector 41 and the connector 42 is a serial-in-serial-out shift register circuit (second shift register circuit), and is configured to have the same number of stages as the shift register circuit 5 for display. Have been. Since the shift register circuit 7 does not require a parallel output signal, the number of lead wires when it is made into an IC is small, and a failure due to poor soldering hardly occurs. In addition, since a heat generation amount is small because a latch drive circuit is not included, reliability is high. Since it can be configured with high density using a small power such as CMOS, it can be configured with one IC, and can be easily configured with a programmable gate array or the like.

Therefore, by configuring the serial output signal of the shift register circuit 7 to be the display data for the next display unit, the serial output signal is not affected by the failure of the display IC, and is displayed on the display unit subsequent thereto. Since data (serial output signal) can be transmitted, a highly reliable information display device can be provided. In this embodiment, the shift register circuit 7 is provided so as to correspond to the display unit. However, the present invention is not limited to this. The shift register circuit 7 may be provided for a plurality of display units.

FIG. 2 is a block diagram showing the second embodiment. The serial output signal (first serial output signal) of the shift register circuit 5 and the serial output signal (second serial output signal) of the shift register circuit 7 are shown in FIG. Signal) is supplied to the comparison circuit 8, which sends out a serial output signal output from the shift register circuit 7. When a command signal is supplied from the connector 10, the comparison circuit 8 compares the two input signals, and outputs a mismatch detection signal together when the two signals do not match. When the command signal is not supplied from the connector 10, the data inverting circuit 9 outputs the serial output signal output from the comparing circuit 8 as it is. However, the command signal is supplied, and the comparing circuit 8 outputs a mismatch signal. The comparison circuit 8
, And inverts the logic of the serial output signal output from the controller.

The comparison circuit 8 and the data inversion circuit 9
Constitutes a signal processing circuit. In the device configured as described above, when a command signal is supplied to the connector 10, the comparison circuit 8 compares the serial output signals supplied from the shift register circuits 5 and 7, and when they match, the shift register circuit The serial output signal supplied from 7 is supplied to the data inverting circuit 9. In the case of a mismatch, in addition to the signal, a mismatch detecting signal is also supplied to the data inverting circuit 9. The data inverting circuit 9 receives the same command signal as the comparing circuit 8 at the same timing, and supplies a serial output of the shift register circuit 7 which is supplied via the comparing circuit 8 when a mismatch signal is supplied from the comparing circuit 8. The logic "1" and "0" of the signal are inverted and supplied to the connector 42. The command signal supplied to the connector 10 determines whether or not the display unit 2 is abnormal. As described above, if the display unit 2 has an abnormality, the data is inverted and the display state is disturbed. Although not shown, when the command signal is supplied, the latch
It is necessary to keep the data of the drive circuit 6 unchanged.

FIG. 3 is a block diagram of an information display device using the display unit of FIG. 2. When the control unit 11 receives a display command from the central unit 13 via the transmission line 12, it connects to the connector 41 of the display unit 2. The display data is transmitted and displayed.
The control unit 11 sends a command signal to the connector 10 of the display unit 2 according to a command from the central device 13 or periodically, and performs a data shift in order to take in a serial output signal from the connector 42 of the last display unit 2. Output shift clock for When the control unit 11 captures data for all display units, the control unit 11 compares the captured data with display data previously output to the connector 41 of the display unit 2. If there is no abnormality in the display unit 2, no inconsistency is detected, but if any of the display units 2 is abnormal and the display unit 2 receives a command signal and the comparison circuit 8 detects inconsistency, the data inversion circuit 9 described above. Since the data inversion is performed, the control unit 11 can detect the display unit whose data has been inverted, that is, the abnormal display unit 2 by comparing with the display data.

The control unit 11 can notify the central unit 13 of the abnormality of the display unit 2 through the transmission line 12.
This facilitates replacement of the abnormal display unit 2 and provides a device with good maintainability. In the above description, the control unit 11 compares the display data with the serial out data of the display unit 2. However, the serial out data of the display unit 2 is sent to the central unit 13 via the transmission line 12, and the central unit 13 is sent. Then, the central unit 13 may detect the abnormality of the display unit 2 by comparing with the display data.

[0013]

As described above, the present invention can be applied to each display unit.
The same unit as the first shift register circuit for display
A second shift register circuit having a number of
The serial input signal input to the
Parallel signal for controlling the display state of the photodiode
And output to the second shift register circuit.
The input serial signal is transferred to the second shift register circuit.
Through the adjacent display unit via the
When a command signal is supplied from the control unit in the circuit, the first cycle
From the shift register circuit and the second shift register circuit
Compare the output first and second serial output signals
If the contents of both signals match, the second serial output
Signal as a serial output signal from the display unit.
If the contents of both signals do not match, the second serial
The output signal from the display unit
These are sent out as serial output signals.
is there. The control unit detects abnormalities in each display unit
Supply a command signal to each display unit,
The last display unit of each display unit connected in a row
Serial output signal taken from the unit and each display unit
To the serial output signal transmitted earlier,
An abnormal display unit is detected depending on the case.
It is. For this reason, the second shift register circuit does not require a display circuit, and the amount of heat generation is reduced, so that the reliability is improved. Therefore, the reliability of display data supplied to the subsequent stage is improved. Further, even if the display circuit is integrated into an IC to improve the economical efficiency and the reliability is reduced, and the operation becomes defective, the display is defective only in the defective display unit. Since the display can be performed normally, the influence of the failure of one display unit on the entire display is extremely small, and the reliability of the entire display device is improved. In addition, the control unit
Easy display of display units and easy maintenance information display
The device can be realized.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a configuration of another embodiment of the present invention.

FIG. 3 is a block diagram of a display device configured using the device of FIG. 2;

FIG. 4 is a diagram showing the entire display surface of the display device.

FIG. 5 is a view showing a display surface of a display unit used in the apparatus of FIG. 4;

FIG. 6 is a block diagram illustrating an example of a conventional display unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Information display apparatus 2 Display unit 3 Light emitting diode 5, 7 Shift register circuit 6 Latch drive circuit 8 Comparison circuit 9 Data inversion circuit 10 Connector 11 Control part 13 Central unit 12 Transmission line

──────────────────────────────────────────────────続 き Continuing from the front page (73) Patent holder 390010054 Koito Industry Co., Ltd. 100, Maeda-cho, Totsuka-ku, Yokohama-shi, Kanagawa-ken (72) Inventor Takehisa 1-6-2 Hatchobori, Chuo-ku, Tokyo Dorsys Co., Ltd. (72) Inventor Shotaro Nakajima 36, Terada Shinike, Joyo-shi, Kyoto Seiwa Electric Co., Ltd. (72) Inventor Hiroshi Onodera 29, Mita-ku, Shinoda-ji, Oita-ku, Kaifu-gun, Aichi Prefecture Nagoya Electric Industrial Co., Ltd. Miwa factory (72) Inventor Kazuhisa Murata 492 Minosho-cho, Yamatokoriyama-shi, Nara Prefecture Sharp Corporation (72) Inventor Mitsuru Sakai 100 Maeda-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Koito Industry Co., Ltd. (56 References JP-A-3-296797 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G09G 3/32 G09F 9/33

Claims (1)

(57) [Claims] 1. A table示素Ko controlling a plurality of display units to arbitrarily control the display state of each of the light emitting diodes based on the serial input signal having a plurality of light emitting diodes as
The display unit is connected in series to the display unit.
By sequentially transmitting serial input signals for each unit
Information display device for displaying desired information on each of the display units
In location, each display unit includes a first shift register circuit for display control for outputting the parallel signals to control the display state of each of the light emitting diodes by sequentially shifting the serial input signal, the first The shift register circuit has the same number of shift stages as one shift register circuit, and sequentially shifts the serial input signal to output a serial output signal in the same format as the serial input signal, thereby transmitting the serial input signal to a subsequent display unit. A second shift register circuit for transferring signals, and a first shift register circuit , when a command signal is supplied from the control unit.
First serial output signal output from the shift register circuit.
And the second output from the second shift register circuit.
Compare the serial output signal of
The second serial output signal to the display unit.
Output as a serial output signal from the
Are not coincident with each other, the logic of the second serial output signal
Serial output from the display unit
A signal processing circuit for transmitting the signal as a signal, wherein the control unit detects an abnormality of each of the display units.
Supply the command signal to each display unit
And the last stage of the display units connected in series.
And the serial output signal captured from the display unit
Compare the serial output signal sent to each display unit first.
And detects an abnormal display unit according to the mismatch.
An information display device characterized in that: