JPH11327509A - Led display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED display unit capable of shortening the scrolling time at the time of displaying a series of optical image groups while scrolling a display screen. SOLUTION: A buffer memory 13 for moving storage positions of display information in a fixed direction is provided in this display and an information introducing end is provided at the side of the display control part 20 of the display to be connected to the control part 20 and information input/output end is provided at the side of a display memory 12 to be connected to the display memory 20. Preferably, the buffer memory 13 is constituted of a shift register having a serial data input/output end, a parallel data input/output end, a serial data shift instruction introducing end and a parallel data read back instruction introducing end. The input end and the input/output end are respectively connected to the display control part 30 and the display memory 12, and the shift instruction introducing end and the parallel data read back instruction introducing end are respectively connected to the display control part 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an L display for continuously displaying a series of display information while scrolling a display screen.
It relates to an ED display.

[0002]

2. Description of the Related Art Conventionally, LEs made like an electric bulletin board have been used.
A D-display is widely used and is installed in a place with a lot of traffic to show various kinds of guidance information to passers-by and the like. For example,
It can be installed on the outer wall of a building to display news, used for posting bulletins in public buildings such as city halls, and used for guidance on airports and stations. In particular, in the station yard of the railway, it is used to display the time of departure and arrival of trains, in this case,
There is a need for an LED display that allows many passengers to understand the displayed contents at a glance.

FIG. 4 is a view for explaining an LED display according to a conventional example. As shown in FIG. 4, the LED display 100 includes a plurality of sets of display modules 110.
And a display control unit 120 for controlling the display function of each display module 110. Each display module 110 includes a number of LED elements 11a.
An LED light emitting unit 11 in which a is arranged in a matrix and a display memory 112 for its display information are provided, and a series of display information is transferred from the display control unit 120 to the display memory 12 via the buffer memory 113. It has a configuration.

FIGS. 5A and 5B are views for explaining the display screen of the LED light emitting unit shown in FIG. 4, wherein FIG. 5A shows a screen at a specific point in time, and FIG. Show. FIG.
11, one display screen is shared by a plurality of LED light emitting units 11... 11, and each of the divided screens (9 in FIG. 5) is scrolled from right to left in the drawing to form a series of optical images. The groups are displayed by flowing them in order. For this reason, even if the light emitting surface of one LED light emitting unit 11 is not particularly large, emergency guidance information can be quickly indicated by using large characters, figures, and the like that passengers at a glance can see from a distance.

[0005]

However, according to the above-described conventional LED display, the amount of information that can be transferred at one time from the display control unit is limited, so that all display information on one still screen is transferred. Had to repeat the transfer of a limited amount of information many times. Furthermore, since a large number of still screens must be repeatedly formed while scrolling the display screen, it takes a long time until one display information is displayed, which makes it impossible to quickly display emergency guidance. was there.

In order to increase the amount of display information transferred each time, for example, an expensive control element having a high transfer rate must be used as a control element of the display control unit, so that the display control unit becomes expensive. Would. In addition, if the number of signal lines from the display control unit to the buffer memory is increased, or if the number of input / output circuits in the display control unit is also increased, the circuit becomes complicated and the overall failure rate is increased. Therefore, elimination of these problems has become an important issue.

Therefore, an object of the present invention for solving the above-mentioned problems is to provide an LED display which can reduce the processing time required for scrolling.

[0008]

In order to achieve the above object, an LED display according to the present invention comprises a large number of LED elements connected to an LE.
A display module that is arranged in a D light emitting unit and has a display memory for displaying the display information, and a display control unit that supervises and controls the display function of each unit. In an LED display in which a group is formed on a display screen, a buffer memory for moving a storage position of display information in a certain direction is provided in a display module, and the buffer memory is provided on a display control unit side. An information input terminal is provided, an information input / output terminal is provided on the display memory side, the information input terminal is connected to the display control unit, and the information input / output terminal is connected to the display memory.

According to the LED display of the present invention, the display information is transferred from the display control unit to the display memory by the buffer memory, and the display information is read back from the display memory and shifted in a certain direction. New display information can also be added and transmitted to the display memory again. For this reason, if the display control unit causes the transfer, read back, shift, and retransmission of display information to the buffer memory to be repeated in order, a series of optical images is displayed while the display screen is scrolled by the LED light emitting unit. It can be formed continuously on the screen.

[0010] The LED display according to claim 2 of the present invention comprises:
The display module is composed of a plurality of stages, the buffer memory of one display module is connected to the information sending end of the display control unit, and the other buffer memories are connected in a multi-stage series configuration. Features.

Thus, display information of an arbitrary length can be used.

[0012] The LED display according to claim 3 of the present invention comprises:
The buffer memory includes a shift register having an input terminal for serial data and an output terminal for serial data, and an input / output terminal for parallel data.The input terminal is connected to a display control unit, and the input / output terminal is It is characterized by being connected to a display memory.

[0013] The LED display according to claim 4 of the present invention,
The buffer memory includes a shift register having a shift instruction introduction end for serial data and a readback instruction introduction end for parallel data, and the shift instruction introduction end and the readback instruction introduction end are connected to the display control unit. It is characterized by the following.

With these, it is possible to connect to a general display control unit and display memory.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram illustrating an embodiment of the present invention. As shown in FIG. 1, the LED display 1 according to this embodiment includes a plurality of display modules 10... 10 for display information and a display control unit 20 of each display module 10.

The LED display 1 is installed in, for example, a station of a public transportation system, and is suitable for use in displaying information such as passing or arriving vehicles at the station to passengers. Can promptly display a variety of guidance information by remote control from a central management room or the like provided at a remote location.

The display control section 20 includes an MPU such as a well-known microcontroller and peripheral circuits such as a work memory for holding state information, and a control memory 30 for storing a display control program. Is attached. A signal line 13b for serial data and a group of various control lines 21 are connected to respective connection terminals on the display module 10... 10 side of the display controller 20, and a display terminal from a remote location is connected to a connection terminal on the external side. The operation communication line group 22 is connected. The communication line group 22 includes a transmission line for display information, a selection line for display operation, and the like.

The surface of the display module 10 is provided with an LED light emitting section 11 for forming an optical image according to display information. The LED light emitting section 11 includes a large number of LEs.
D elements 11a... 11a are arranged in a matrix on the substrate, and each of the LED elements 31a.
An optical image composed of characters, numerals, figures, or the like is formed by the combination of 1a. LED light emitting unit 11
A display memory 12 for display information corresponding to the optical image is attached to the back, and is connected to the display control unit 20 via various control line groups 21.

FIG. 2 is an enlarged view of a main part of the display module shown in FIG. As shown in FIG. 2, the display memory 12 has a writable and readable RAM.
Multiple addresses 12a for storing parallel data
.. 12a are formed, and a plurality of addresses 12a.
It is configured to represent the optical image by the display information stored in 2a.

An address bus 21a for designating each address 12a, writing to each address 12a,
Or write / read control line 21b for instructing read
And are connected. As the write / read control line 21b, if a write control line and a read control line are separately provided, a general inexpensive RAM can be used.

In addition, various control lines such as an address or data latch enable, a device select, and a clock are connected to each of the display memories 12... 12. Is omitted.

The parallel data input / output unit 12c of the display memory 12 is provided with a buffer memory 13 for transferring display information from the display control unit 20 to the display memory 12, and the parallel data input / output terminal of the buffer memory 13 They are connected via a data format bidirectional signal line group 13a. As the buffer memory 13, a one-word shift register 33 corresponding to display information of parallel data is used, and the serial data input terminal of the buffer memory 13 is connected to the serial data signal line 13 b described above. You.

The serial data output terminal of the buffer memory 13 is connected to the serial data input terminal of the buffer memory 13 of the next stage via another signal line 13b for serial data. 13 ...
13 are in a multi-stage configuration in which a series is connected in series. Therefore, the display information can be transferred in a serial format using display information of an arbitrary length, and even a long sentence including a plurality of characters or figures can be displayed in a list by one LED display 1.

A shift instruction introduction end of the buffer memory 13 is connected to a shift control line 21c of a shift register.
A parallel data write control line 21d is connected to a read-back instruction introduction end of the buffer memory 13. The address bus 21a and the write control line 21b of the display memory 12 are wired so as to be respectively derived from the display control unit 20 and drawn into the next stage display memory 12 via the display memory 12.

The one signal line 13b, shift control line 21c, and write control line 21d of the buffer memory 13 are connected to the buffer memory 13 of the next stage through the buffer memory 13.

Next, the operation of the present embodiment will be described. 3A and 3B are flowcharts of the display processing of the display control unit shown in FIG. 2. FIG. 3A shows the initial display processing in the initial state, and FIG. 3B shows the scroll display processing in the subsequent scroll operation. Show. As shown in FIG. 3A, according to the initial display process, first, the buffer memory 1
3 is set to display information (step 11). As a premise, a specific display operation has been selected in advance from a remote centralized management console.

As a general optical image, characters, numbers, symbols, simple figures, and the like are arranged in a matrix of 16 bits in length and width, so that a sentence in which a plurality of characters and the like are arranged in a horizontal line must be displayed vertically. 16 bits in the direction (16 L
ED elements 11a... 11a), and one display screen is configured by multiplying the number of characters by 16 bits in the horizontal direction. For this reason,
As the display information, for example, 16-bit data that forms the beginning of one horizontal dot row in the optical image is used.

In step 11, the display control unit 20 first arranges the first display information into a serial data format and sends it to the buffer memory 13 via the one signal line 13b. Line 21c
The first shift operation instruction is sent to the buffer memory 13 via the.

When the first shift operation instruction is continuously transmitted at least for a period corresponding to the information length of the first display information, the display information of the first serial data is sequentially stored in the buffer memory 13 from the head. The data is introduced into the shift register, and the last part reaches the serial data output terminal of the buffer memory 13.

Subsequently, when the display information is successively transmitted to the shift register of the buffer memory 13 in succession, the buffer memory 13
, The first display information is pushed out to the buffer memory 13 in the next stage. Therefore, it is not necessary to set the length of one shift register so that the head of each display information always reaches the last stage (last bit) of one shift register.

By continuously sending a plurality of pieces of display information, all of the buffer memories 13 having a multi-stage configuration are provided.
When 13 is satisfied with each display information, the display information is stored in the display memory 12 (step 12).

In step 12, the display control unit 20 first specifies the first address of each display memory 12 via the address bus 21a, and simultaneously issues a write instruction via the write control line 21b to each display. The data is sent to the memory 12. Then, the specified address 12a of each display memory 12 is accessed via the parallel data format signal line group 13a, and the display information of each buffer memory 13 is stored at a time.

By storing the data in each display memory 12,
The first horizontal one-dot line in the optical image shown in the list is configured on the display memory 12. Subsequently, it is determined whether the address 12a specified this time is the last address 12a of the display memory 12 (step 1).
3). If the last address 12a has not yet been reached, the processing of the steps 11 to 13 is repeated.

If the currently accessed address 12a has already reached the last address 12a, all the dot rows of the optical image have been stored in the respective display memories 12... Is driven (step 14).

In this step 14, the display controller 20
Sends a drive instruction to each LED light emitting unit 11 via a control line (not shown) to display the first optical image according to the display information in the display memory 12. As a result, the first display screen is formed on the LED display 1, and the first sentence of the series of guidance information is shown to the passenger.

Next, scroll display processing will be described. As shown in FIG. 3B, according to the scroll display process, first, display information is read back from the display memory 12 (step 21).

In step 21, the display controller 20 first specifies the first address 12a of each display memory 12 via the address bus 21a, and at the same time,
A read instruction is sent to each display memory 12 via the write / read control line 21b. Subsequently, a parallel data write instruction is sent to the buffer memory 13 via the write control line 21d of the buffer memory 13. by this,
The first display information of the display memory 12 is
Is read back to the buffer memory 13 via the data input / output unit 12c.

Next, the display information read back to the buffer memory 13 is changed (step 22). This step 21
Then, the display control unit 20 first controls the shift control line 2
1c, a second shift operation instruction is issued to each buffer memory 1
3, the read-back display information is shifted by one bit in the direction of the next stage in the shift register of the buffer memory 13, and the last part thereof is shifted to the buffer memory 1.
3 is shifted inward from the serial data input terminal.

At the same time, the serial data input terminal
Since new display information for one bit is sent by the display control unit 20 via the one signal line 13b,
The display information in the buffer memory 13 is changed to the next display information to which the one bit is added.

Subsequently, the same processing as the above-described storage in the display memory 12 (step 12) is performed (step 2).
3) The changed display information is stored at one time in the first address 12a of each display memory 12 as the first horizontal dot row in the new optical image.

Subsequently, the same processing as the above-described determination of the address 12a (step 13) is performed (step 2).
4) If the accessed address 12a has not yet reached the last address 12a, the processing of the above-described steps 21 to 24 is repeated.

However, if the last address 12a has already been reached, the same processing as the above-described display on the LED light emitting section 11 (step 14) is performed (step 25), and new display information in the display memory 12 is used. Optical image for each L
It is displayed on the ED light emitting unit 11. As a result, the first display screen described above is scrolled by one bit, a new display screen is formed on the LED display 1, and the subsequent part of the above-described text and the like is shown to the passenger.

As described above, by repeatedly performing the above-described scroll display processing, the display control unit 20 does not need to send all the display information of each display screen to the buffer memory 13 every time. Therefore, after the second time, new display information is stored in the buffer memory 1 in a short time.
3, the text of the guide information can be quickly displayed to the end while scrolling the display screen of the LED display 1.

[0044]

As described above, according to the present invention,
Transfer display information to buffer memory, read back, shift,
And retransmission are repeated in order, and a series of display information can be displayed continuously while scrolling the display screen,
An LED display with reduced processing time required for scrolling can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an embodiment of the present invention;

FIG. 2 is an enlarged view of a main part of the display module shown in FIG. 1,

FIG. 3 is a flowchart of a display process of a display control unit shown in FIG. 2;

FIG. 4 is a diagram illustrating an example of an LED display according to a conventional example.

FIG. 5 is an explanatory diagram of a display screen of the LED light emitting unit 11 shown in FIG. 4,

[Explanation of symbols]

1,100: LED display, 10, 100: display module, 11: LED light emitting unit, 11a: LED element, 1
2, 112: display memory, 12, 113: buffer memory, 13b: signal line, 20, 120: display control unit, 21
... control line, 22 ... communication line, 30 ... control memory.

Claims (4)

[Claims] At least one set of a display module (10) having a large number of LED elements (11a... 11a) arranged in an LED light-emitting section (11) and a display memory (12) for displaying the display information, and A display control unit (20) that supervises and controls the display function of the LED display (1) that forms a series of optical images on the display screen while scrolling the display screen. Is provided with a buffer memory (13) for moving the storage position of the display information in a fixed direction, and the buffer memory (13) includes a display control unit (2).
An information input end is provided on the (0) side, an information input / output end is provided on the display memory (12) side, and the information input end is a display control unit (20).
And the information input / output end is connected to a display memory (12). 2. The display module (10) includes a plurality of stages, and a buffer memory (13) of one display module (10) is connected to an information transmitting end of a display control unit (20).
2. The LE as claimed in claim 1, wherein the other buffer memories are connected in multiple stages in a series series configuration.
D display. 3. The buffer memory (13) comprises a shift register having an input terminal for serial data, an output terminal for serial data, and an input / output terminal for parallel data, wherein the input terminal is connected to the display control unit. 3. The LED display according to claim 1, wherein the input / output terminal is connected to the display memory, and the input / output terminal is connected to the display memory. 4. The buffer memory (13) is constituted by a shift register having a shift instruction introduction end for serial data and a read back instruction introduction end for parallel data, wherein the shift instruction introduction end and the read back instruction introduction end are provided. An end is connected to the display control section (20).
4. The LED display according to 2 or 3.