JPH0922269A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a software processing for a scrolling at the time of performing a scroll display on LED displays. SOLUTION: This device is constituted of a first buffer circuit 10 taking out and storing data of a display content consisting of a prescribed number of bits stored in a memory M, storage circuits 11a, 11b storing the data of the first bit among the data of the display content stored in the first buffer circuit 10 or the last bit among the display content. second buffer circuits 12a, 12b taking out and storing residual data stored in the first buffer circuit 10 and also taking out the data of the first bit stored in storage circuit 11a, 11b to store the data after the residual data and taking out the data of the last bit stored in the circuits to store the data before the residual data and a returning storage circuit returning data stored in the second buffer circuits 12a, 12b to the memory M and making the memory store them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device capable of displaying while scrolling a predetermined guide such as a train guide on a display plate installed in a predetermined place such as a station yard while scrolling.

[0002]

2. Description of the Related Art Conventionally, a display device of this type has a large number of LEs.
To scroll display on the display board with D display,
Bit shift of the memory in which the data of the guide contents for display is stored is performed by software processing, that is, continuous processing is performed by a program.

[0003]

The above-mentioned conventional display device for performing scroll display by software has a drawback that the program amount increases as the display content increases and the load of software processing increases. Since the program processing speed corresponds to the scroll speed, when the program amount increases, the scroll speed decreases. Therefore, if the scroll speed is kept below a predetermined value, the display content capacity is naturally limited. there were.

Therefore, the present invention has been made to solve the above-mentioned drawbacks, and its purpose is to reduce the load of software by processing the bit shift of the memory for scroll processing by hardware. An object of the present invention is to provide a display device in which the scroll speed is not affected even if the display capacity is large.

[0005]

In order to achieve the above-mentioned object, a display device according to the present invention is a display device in which display contents stored in a memory are scroll-displayed on a display plate and is stored in the memory. A first buffer circuit for extracting and storing display content data having a predetermined number of bits, and first bit data of the display content data stored in the first buffer circuit, or A storage circuit that stores the data of the last bit of the display content data and the remaining data that is stored in the first buffer circuit are stored and
A second bit of data that is stored in the storage circuit is extracted and stored after the remaining data, or before the remaining data of the last bit stored in the storage circuit. It is characterized by having a buffer circuit and a return storage circuit for returning the data stored in the second buffer circuit to the memory and storing the data therein.

[0006]

In the above structure, the first buffer circuit includes:
The display content data having a predetermined number of bits stored in the memory is stored. The storage circuit stores the first bit data of the display content data stored in the first buffer circuit, or the last bit data of the display content data. The second buffer circuit takes out and stores the remaining data stored in the first buffer circuit, and stores the first bit of data stored in the storage circuit after the remaining data, or The last bit of data stored in the storage circuit is fetched and stored before the rest of the data. Then, the data stored in the second buffer circuit is stored in the memory via the return storage circuit.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an apparatus of one embodiment.

The display board 1 is a well-known display board having a large number of LEDs arranged therein. The display board 1 is installed, for example, in a station yard and is used when performing train guidance.

The display control on the display board 1 is performed by the microcomputer (CPU) 2 using the data stored in the memory M in advance according to a predetermined program and the display driver 3. Be done. In addition, the display on the display plate 1 is configured to be scrolled rightward or leftward by a bit shift circuit a described later, so that the characters or symbols of the guidance content are indicated by arrows.

The bit shift circuit a is a first buffer circuit 10 capable of storing a predetermined number of bits of data.
And a pair of first and second memory circuits 11a and 11b each including a flip-flop (F / F) circuit capable of storing 1-bit data, and an F / F having the same capacity as the first buffer circuit 10. It is composed of a pair of second buffer circuits 12a and 12b formed of a circuit, and a third buffer circuit 13 having the same capacity as the first buffer circuit 10 and corresponding to the return storage circuit of the present invention.

Of the above components, the first memory circuit 11a
The second buffer circuit 12a is used when the scroll direction of the display 1 is rightward, and the second memory circuit 11b and the second buffer circuit 12b are used when scrolling leftward. Since the configurations are the same, the description will be centered on the first memory circuit 11a and the second buffer circuit 12a that scroll rightward.

Next, the control operation of the apparatus of this embodiment will be described. To simplify the explanation, the data stored in the memory M has an 8-bit structure, the first buffer circuit 10 and the second buffer circuit 10. The capacities of the buffer circuit 12a and the third buffer circuit 13 will also be described as 8 bits.

When a read signal is applied to the first buffer circuit 10 from the CPU 2, the 8-bit data "b0, b1, ... B7" stored in the memory M is stored in the first buffer circuit 10 in this order. Are captured and stored in. In the memory circuit 11a, the first data "a0" of the 8-bit data "a0, a1, ... A7" read during the previous read is fetched from the first buffer circuit 10 and stored therein. ing. Then, the second buffer circuit 12
When a read signal is given to a by the CPU 2, data is taken in from the first buffer circuit 10 and the storage circuit 11a, and "b1, b2 ... b" is stored in the second buffer circuit 12a.
7 and a0 "are stored in this order.

When a write signal is applied from the CPU 2 to the second buffer circuit 12a, the second buffer circuit 12a
Data is taken in and stored in the third buffer circuit 13. The CPU 2 is added to the third buffer circuit 13.
When the write signal is applied from the memory M, the data stored in the third buffer circuit 13 is stored in the memory M.

Therefore, the data contents in the memory M are initially "b0, b1, b" by the series of processes described above.
2 ... b7 "becomes" b1, b2, b7 ... b7, a0 ", and by the next processing," b2, b3, b4 ... b7,
a0, a1 ".

As described above, since the bit shift for scrolling in the apparatus of this embodiment is performed by the bit shift circuit a composed of hardware, it can be realized without increasing the load of software as in the conventional case. You can

[0017]

According to the display device of the present invention, a first buffer circuit for extracting and storing display content data having a predetermined number of bits stored in a memory, and the first buffer circuit is stored in the first buffer circuit. A storage circuit for storing the first bit data of the display content data or the last bit data of the display content data, and the remaining data stored in the first buffer circuit. The data of the first bit stored in the storage circuit is taken out after the remaining data, or the data of the last bit stored in the storage circuit is placed before the remaining data. Since it is composed of a second buffer circuit for taking out and storing it, and a return storage circuit for returning the data stored in the second buffer circuit to the memory and storing it, The bit shift for the crawl,
It can be performed by hardware, and can be realized without increasing the load of software as in the past.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 display device 2 CPU 3 display driver 10 first buffer circuit 11a, 11b storage circuit 12a, 12b second buffer circuit 13 third buffer circuit M memory a bit shift circuit

Claims (1)

[Claims] 1. A display device for scroll-displaying display contents stored in a memory on a display plate, wherein first display data having a predetermined number of bits stored in the memory is extracted and stored. A buffer circuit, and a storage circuit for storing the first bit data of the display content data stored in the first buffer circuit, or the last bit data of the display content data, The remaining data stored in the first buffer circuit is retrieved and stored, and the first bit of data stored in the storage circuit is stored after the remaining data or in the storage circuit. The second bit of data for fetching and storing the last bit of data present before the remaining data
And a return storage circuit that returns the data stored in the second buffer circuit to the memory and stores the data in the memory.