JP2617845B2 - Light emitting display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-emitting display device using a light-emitting element such as an LED, and more particularly to a light-emitting display device having both a display function and a signal transmission function.

[0002]

2. Description of the Related Art There are various devices for displaying information, but a normal display device only displays information.
For example, as shown in FIG. 6, a number is displayed using the display plate 101. The number displayed on the display panel 101 is recognized by a human, and control of the device corresponding to the number is performed. At this time, when the display content of the display panel 101 is read mechanically instead of artificially, the display shown in FIG.
As shown in (1), the display surface of the display panel 101 is imaged using the TV camera 102, and the display content is captured as an image. Then, the electric signal output from the TV camera 102 is analyzed by the image analysis unit 103, and the display number is decoded by the number decoding unit 104 from the result.

Here, when there is no need to visually recognize the display information on the display panel 101, it is not necessary to perform image analysis using the TV camera 102, and it is sufficient to simply transmit the display information. This signal can be received by a simple receiver, and can be automatically transmitted to a control unit or the like of the device.

[0004]

In the conventional display device, as described above, the display information is visually recognized and read by a human. There was a problem that it was not possible. When the display information is analyzed and read,
There is a problem that enormous cost and high cost are required for the image analysis, and furthermore, the display font is restricted, and the correct reading rate does not reach 100%.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a light-emitting display device capable of always recognizing accurate display information with a simple configuration. .

[0006]

According to the present invention, there is provided a light emitting display device which performs a predetermined display by using a light emitting element, and controls a light emitting time and a non-light emitting time of the light emitting element of the display according to display information. And a light emission control means for transmitting a code signal.

Further, the display is adapted to perform dot matrix display by LEDs,
The ED is multiplex driven, and the light emission control means transmits a code signal corresponding to the display information within a display period of one screen.

[0008]

In the light emitting display device of the present invention, a predetermined display is performed by the light emitting element on the display, and at the same time, the light emitting time and the non-light emitting time of the light emitting element are controlled, and the code signal corresponding to the display information is obtained. Is sent.

[0009]

FIG. 1 is a diagram showing a basic configuration of a light emitting display device according to the present invention. In the figure, reference numeral 1 denotes a display body for performing a predetermined display by a plurality of light emitting elements 2 such as LEDs, which are divided into three parts in order to display a three-digit number. They are arranged in a matrix. Reference numeral 3 denotes light emission control means for controlling the light emission time and non-light emission time of the light emitting element 2 of the display 1 to transmit a code signal corresponding to display information, and 4 a light receiving means for receiving the signal light and converting it to an electric signal. The element 5 is a signal processing circuit for processing the electric signal, and 6 is a display for displaying the processing result.

As shown in FIG. 1, for example, a three-digit number of "127" is displayed on the display 1 in decimal notation as shown in FIG. This display information is visually recognized by the human eyes 7 and the display of the display 1 can be recognized as “127”. Then, based on the recognized information, control of the device and the like can be performed.

At this time, at the same time, the light emission control means 3 modulates and controls the light emission time and the non-light emission time (duty ratio) of a part or all of the light emitting elements 2 in accordance with the display information, according to the above-mentioned display information. A code signal is transmitted.
This signal is input to the signal processing circuit 5 through the light receiving element 4, where it is demodulated and sent to the display 6. Then, the display device 6 displays the number “127” as display information, and transmits the information signal to a control unit or the like of the device.

In general, when information is transmitted by light, a light receiving element such as a phototransistor, a photodiode, or CdS is provided on the side receiving the information. In the case of a remote control device, for example,
Infrared light is used so that it is not perceived by the human eye. However, these conventional devices only transmit information using light, and do not display information.

According to the present invention, as described above, information is added to the light emitted from the light source (light emitting element 2), and at the same time, the light source itself has a display function, and a human and a light receiving element 4 are provided. We try to convey information of the same meaning to both. For this reason, even if a human misreads the display content, the machine can correctly read the display information and can always recognize the correct display information. Moreover, it is not necessary to perform image analysis using a TV camera as in the related art, and it is possible to reduce the cost with a simple configuration.

FIG. 2 is a block diagram showing a circuit configuration of an embodiment of the present invention. In this embodiment, the display 1 of FIG. 1 is configured by arranging a plurality of (n) LED matrix displays 11 of 16 × 16 dots, and performs multi-digit display by multiplex driving. . This multiplex drive displays one line at a time sequentially, and when all lines have been displayed, the display for one screen is completed. By repeating this at high speed, a stable display without flicker is visually recognized. can do.

Each of the LED matrix displays 11 includes:
An LED display unit 12 in which LEDs serving as light emitting elements (light sources) are arranged in a 16 × 16 dot array, a decoder / driver 13 for selecting one line from a code signal for designating a display line and driving the LED of that line, and the LED of that time A shift register that holds data for controlling turning on and off
Drivers 14 are provided.

The light emission control means 3 shown in FIG. 1 is constituted by the CPU 15, and signal lines 16 to 20 are arranged between the CPU 15 and each LED matrix display 11. Ports a to d of the CPU 15 from the signal line 16
, A designation code (O to F) for designating the display line is output to each decoder / driver 13, and data to be displayed (Data) is transmitted from a signal line 17 to each shift register.
Output to the driver 14. A data strobe (DST) signal, a clock (CLK), and a blink (BLNK) signal are output to each shift register driver 14 from each of the signal lines 18 to 20, respectively. Reference numeral 21 denotes a switch for designating a display.

Next, the operation of the circuit having the above configuration will be described with reference to the timing chart of FIG.

The CPU 15 outputs a display line designation code (O to F) to the signal line 16 to display one line.
Then, while displaying this one line, data for displaying the next line is sent to each shift register driver 14 through the signal line 17. The number of data at this time is (the number of data for one display unit × the number of display units), that is, 16 × n.

The 16 × n data sent from the CPU 15 is sequentially read into the shift register driver 14 at the timing of the clock on the signal line 19.
When the shift register driver 14 is filled with all data, display of one line is started by the data strobe signal on the signal line 18. Here, the data strobe signal is supplied to the shift register driver 14
Is a signal for designating the timing of the display switching so that the display does not change while data is being input to the.

By performing the above operation at high speed on the 16 lines OF to F, each LED matrix display unit 12
Completes the display of one screen. This screen display can be directly recognized by human eyes.

In the circuit shown in FIG. 2, during the period in which each LED matrix display 11 multiplexes the LEDs to display one screen, the CPU 15 outputs a code signal corresponding to the display information to each LED. Transmit by blinking. That is, the CPU 15 turns on and off the LED with a predetermined code within the display time of one line, and for example, “127” is displayed on the three-digit (n = 3) LED matrix display 11.
Is displayed, and information of the BCD code “127” is added to the light from the LED.

At this time, the CPU 15 turns on the LED,
A blink signal is output to the signal line 20 to control turning off. Here, after the lapse of the time t1 from the output of the data strobe signal, which is the start signal of the line display, the state where the LED is lit at a time interval of t2 is "0", and the state where the LED is lit is "1". Then, the blink signal output as the BCD code is "0001" (= 1) in the example of FIG.
“0010” (= 2) and “0111” (= 7),
This means that the code of "127" has been transmitted.

Here, the display is visually appealing, but there are many displays in which a human must perceive display information and then operate a machine in response to the perception. However, since the contents of the display may be erroneously recognized, the use of the communication means so as not to cause such a case and the configuration as the visible transmission device as described above also increases the certainty. It is useful.

FIG. 4 is a diagram showing an example in which the above-described light emitting display device of the present invention is applied to a train number display. In the figure, 3
Reference numeral 1 denotes a display plate displaying a code number assigned to the train, which is displayed by a light emitting element such as an LED. In addition, blinking of light emission of the light emitting element is controlled by light emission control means (not shown), and a code signal (optical signal) corresponding to display is transmitted. This transmission signal is received by a receiver 32 having a light receiving element, where the code number is demodulated.

The demodulated code number is transmitted to, for example, equipment related to train operation, and a predetermined operation is performed. Conventionally, the code number of the train is visually recognized by the staff in charge, and the timing of turning on the departure signal light, the necessity of switching points, the determination of the necessity, and whether the train is passing or stopping by an express train Various actions such as judgment were required, but these can be automated.
In addition, since it is also possible to confirm by visual check of the staff at the same time,
Safer and more reliable operation can be realized. In addition,
In a place where the receiver 32 is not installed, it is possible to cope with the conventional method using only visual recognition.

FIG. 5 shows a case where the present invention is applied to a traffic sign on a road. In the figure, reference numeral 33 denotes a display plate which is a speed limit sign, and the speed limit is displayed by a light emitting element. Further, a signal corresponding to the display content, in the illustrated example, a signal corresponding to 60 km / H is transmitted by blinking of the light emitting element. This signal is received by the receiver 34 attached to the traveling vehicle, where the display information on the display panel 33 is demodulated.

The demodulated display information is compared with, for example, the traveling speed of the vehicle. If the speed is over, an alarm can be issued or the vehicle can be decelerated directly, which is useful for safe operation of the vehicle. Can be made. Further, as in the example of FIG. 4, in a vehicle in which the receiver 34 is not installed, it is possible to confirm only by visual recognition as in the related art.

Although the above embodiment has been described with reference to the case of displaying numbers, the display may be characters, pictures or patterns. Further, information related to display contents, for example, a code corresponding to a color tone may be transmitted, and the present invention can be applied to a traffic light. in this case,
If a predetermined transmission code is set for each of the red, yellow, and blue signal colors, the vehicle that has received the code can automatically perform the operation that the signal color implies. .

[0029]

As described above, according to the present invention, the display is performed by the light emitting element, and at the same time, the code signal corresponding to the display information is transmitted by controlling the light emitting time and the non-light emitting time of the light emitting element. Thus, an effect is obtained in which accurate display information can always be recognized with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a light emitting display device according to the present invention.

FIG. 2 is a block diagram showing a circuit configuration according to an embodiment of the present invention;

FIG. 3 is a flowchart showing the operation of the circuit of FIG. 2;

FIG. 4 is an explanatory diagram showing an example in which the present invention is applied to a train number display.

FIG. 5 is an explanatory diagram showing an example in which the present invention is applied to a traffic sign on a road.

FIG. 6 is a configuration diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display body 2 Light emitting element 3 Light emission control means 11 LED matrix display 15 CPU

Claims (3)

(57) [Claims] 1. A display device for performing a predetermined display by a light-emitting element, and a light-emitting control unit for controlling a light-emitting time and a non-light-emitting time of a light-emitting element of the display body to transmit a code signal according to display information. A light-emitting display device, characterized in that: 2. The light-emitting display device according to claim 1, wherein the display performs a dot matrix display by using an LED. 3. The luminous display according to claim 2, wherein said display unit multiplex-drives an LED, and said luminescence control means transmits a code signal corresponding to the display information within a display period of one screen. apparatus.