JPH04296896A - Led display device - Google Patents

Abstract

PURPOSE:To obtain a display device for selecting the display contents of a plurality of LED display devices in an equal timing. CONSTITUTION:An LED display device which has a plurality of image scenes of the display contents and displays the same information to a plurality of LED display devices 1 and 2 is equipped with a display controller 3 which gives the display contents and given the selection instruction for the display contents to each LED display device 1, 2, transmission line 10 for transmitting the display contents supplied from the display controller 3 to the LED display devices 1 and 2, and a synchronous signal line 11 for transmitting the selection instruction for the display contents supplied from the display controller 3 to the LED display devices 1 and 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED (light emitting diode) display device used, for example, to display train schedules alternately in Japanese and English to passengers at stations.

0002

[Prior Art] Furthermore, even when it is desired to display one piece of information on two LED display screens, the two screens are switched at the same time, which prevents the inconvenience of one side displaying the previous information. I can do it.

Conventionally, when displaying train schedules alternately in Japanese and English on two LED displays, for example, there are two display switching methods: a first method and a second method, which will be described below. The first method is a method in which a display switching instruction for display contents is issued from a display control device to an LED display via a transmission line.

The second method, as shown in the flowchart of FIG. 5, is a method in which switching is performed for each display using a timer inside each display. That is, after displaying screen 1 (S51), after a certain period of time T1 has elapsed (S52)
, screen 2 is displayed (S53), and after a certain period of time T2 has elapsed (S54), the display returns to screen 1 (S51), and this is repeated thereafter.

[0005]

[Problems to be Solved by the Invention] The first conventional method described above is a method in which the display contents are switched over the transmission line, so when the transmission line is under high load, transmission delays, retransmissions due to transmission errors, etc. There has been a problem in that display switching instructions for the LED display devices are not necessarily given at the same timing. Furthermore, since a display switching instruction had to be transmitted each time switching was performed, there was also the problem that the load on the display control device became heavy.

[0006] Furthermore, in the method of switching each LED display using a timer, if the timer value for each LED display is slightly different, the timing of switching the display contents for each LED display may shift over time. There was a problem with it coming. For this reason, when displaying train schedules alternately in Japanese and English on two LED displays, one may display Japanese while the other displays English. This may result in a disproportionate display. Furthermore, L.E.
When displaying one piece of information on two D displays, one side may remain displaying the previous information, and therefore the originally intended information is not displayed.

The present invention has been made in view of the above points, and an object of the present invention is to provide an LED display device that can switch the display contents of a plurality of LED displays at the same timing.

[0008]

[Means for Solving the Problems] A first invention provides an LED display device in which the display content is for a plurality of screens and the same information is displayed on a plurality of LED displays, in which each of the L
a display control device that provides display content to the ED display and also provides switching instructions for the display content; a transmission line for transmitting the display content from the display control device to each of the LED displays; and the display. A synchronizing signal line is provided for transmitting a display content switching instruction from a control device to each of the LED indicators.

[0009] A second invention is an LED display device in which the display content is for a plurality of screens and the same information is displayed on a plurality of LED displays, in which the display content is given to each of the LED displays, and The instruction to switch the display contents is
a display control device for supplying one of the ED displays; a transmission line for transmitting display content from the display control device to each of the LED displays; A synchronizing signal line is provided for instructing the rest of the LED displays to switch the display content when a display content switching instruction is transmitted from the control device.

0010

[Operation] According to the first invention, the transmission line and the timer of the LED display are not used to instruct the switching of display contents;
Since the LED display and the display control device are directly connected by a signal line, and instructions for switching display contents are given to each LED display by a synchronization signal line, multiple L
The display contents of the ED display can always be the same screen.

According to the second invention, when an instruction to switch the display content is given to one of the LED displays without using the transmission line and the timer of the LED display, the remaining LEDs Since a display content switching instruction is also given to the display, the display content of the plurality of LED displays can always be the same screen.

0012

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a first embodiment will be described with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram showing the configuration of the first embodiment, and an LED display device A1 includes an LED display panel 4 and an LED display panel 4.
It consists of a controller 6 and a display signal line 8 that electrically connects the two, and the LED display B2 is connected to the LED display panel 5.
, an LED controller 7, and a display signal line 9 that electrically connects the two. LED controller 6
, 7, information from the display control device 3 is inputted via the transmission line 10, and based on the information received here, the L
A display screen to be displayed on the ED display panels 4 and 5 is created. Further, the display control device 3 and the LED displays 1 and 2 are connected by a synchronization signal line 11.

The operation of the first embodiment configured as described above will be explained with reference to the flowchart shown in FIG. Now, for example, after displaying screen 1 on LED display 1,
S1), monitors the synchronization signal line 11 from the display control device 3 and waits for a switching instruction (S9). On the other hand, after the predetermined time T1 has elapsed (S5), the display control device 3 outputs a display content switching instruction (S9) to the synchronization signal line 11 (S6). Thereby, the LED display 1 displays the screen 2 (S3), monitors the synchronization signal line 11 from the display control device 3 again, and waits for a switching instruction (S10) to be given (S4). After the predetermined time T2 has elapsed (S7), the display control device 3 outputs a display content switching instruction (S10) to the synchronization signal line 11 (S8). Thereafter, the same operation as the LED display 1 and display control device 3 is repeated between the LED display device 2 and the display control device 3 as well.

According to the first embodiment of the present invention, by outputting a display content switching instruction from the display control device 3 to the synchronization signal line 11, the display content of the two LED displays 1 and 2 can be switched simultaneously. Can be done.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. 3 is a block diagram showing the configuration of the second embodiment, which differs from the first embodiment described above in the following points. That is, the LED display device 1 and the LED display device 2 are connected by a synchronization signal line 10, and the display control device 3 and the LED controllers 6 and 7 are connected by a transmission line 10.

Next, the operation of the second embodiment will be explained with reference to the flowchart of FIG. After displaying screen 1 (S21), the LED display A1 monitors the synchronization signal line from the LED display B2 and waits for a switching instruction (S31) to be given (S22). On the other hand, after displaying screen 1 (S25), the LED display B2 sends an instruction to switch the display content (
S31) is output (S27), and screen 2 is displayed (S2
8). As a result, the LED display A1 displays screen 2 (S23), monitors the synchronization signal line from the LED display B2 again, and waits for a switching instruction (S32) to be given (S24). After the predetermined time T2 has elapsed (S29), the LED display B2 outputs a display content switching instruction (S32) to the synchronization signal line 11 (S30), and displays screen 1 again (S25). In response to this, the LED display A1 is
Screen 1 is displayed again (S21), and LED display B is displayed again.
2 and waits for a switching instruction (S31) to be given (S22). From then on, LED indicator A
1. Repeat this operation for LED indicator B2.

According to the second embodiment described above, one L
By outputting a display content switching instruction from the ED display A1 to the other LED display B2 to the synchronization signal line 11, the display content of the two LED displays 1 and 2 can be switched simultaneously. This allows, for example, two LE
When displaying train schedules alternately in Japanese and English on the D display, this prevents the occurrence of an unbalanced display where one side is displaying Japanese while the other is displaying English. be able to. Furthermore, even when it is desired to display one piece of information on two LED display screens, since the two screens are switched simultaneously, it is possible to prevent an inconvenience in which one side continues to display the previous information.

[0019]

According to the present invention, it is possible to provide an LED display device in which the display contents of a plurality of LED displays are switched at the same timing.

[Brief explanation of the drawing]

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

FIG. 2 is a flowchart for explaining the operation of the embodiment shown in FIG.

FIG. 3 is a block diagram showing the configuration of a second embodiment of the present invention.

FIG. 4 is a flowchart for explaining the operation of the embodiment of FIG. 3;

FIG. 5 is a flowchart for explaining a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... LED display A, 2... LED display B, 3... Display control device, 4, 5... LED display panel, 6, 7... LED controller.

Claims (2)

[Claims] Claim 1: In an LED display device that has display content for multiple screens and displays the same information on multiple LED displays, the display content is given to each of the LED displays, and the display content is switched. A display control device for giving instructions, a transmission line for transmitting display content from the display control device to each of the LED displays, and a transmission line for transmitting display content switching instructions from the display control device to each of the LED displays.
Equipped with a synchronization signal line for transmitting to the D display,
An LED display device characterized in that the display contents of the plurality of LED displays are always the same screen. 2. In an LED display device that has display content for multiple screens and displays the same information on multiple LED displays, the display content is given to each of the LED displays, and the display content is switched. a display control device for giving instructions to one of the LED indicators; a transmission line for transmitting display content from the display control device to each of the LED indicators; a synchronization signal line for instructing the rest of the LED indicators to switch the display content when a display content switching instruction is transmitted from the display control device;
An LED display device characterized in that the content displayed on the D display is always the same screen.