JPH0455892A - Display device - Google Patents

Abstract

PURPOSE:To achieve display of high function with a large screen by discretely executing the changing over and display of the display contents to be displayed by a display means for each of 1st and 2nd display regions by one of a pair of memories. CONSTITUTION:The screen of the display means 3 is divided by the 1st display region and the 2nd display region. The 1st display contents to be displayed by the 1st display region are stored in either of the alternately changed over 1st memory 9 or the 2nd memory 10. The stored contents are read out of the other of the 1st memory 9 or the 2nd memory 10 and are displayed in the 1st display region. The 2nd display contents to be displayed by the 2nd display region are displayed by the 3rd or 4th memory. The changing over of the 1st and 2nd memories and the changing over of the 3rd and 4th memories are discretely executable. A still picture is displayed in, for example, the 1st display region in this way and the images to be scrolled are displayed in the 2nd display region, by which the displaying of the still picture and the scroll images is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device that displays characters and images based on data sent from an input device.

Prior Art FIG. 7 is a perspective view for explaining a conventional display device 51, and FIG. 8 is a block diagram showing the basic configuration of the conventional display device 51. Such a display device 51 includes an input section 52 using an input device such as a personal computer for inputting characters, images, etc., and a display section 53 for displaying the input characters and images. Input data of characters and images input to the input section 52 is sent to the control section 54 .

From the data input from the input unit 52, the control unit 54
Image data to be displayed by the display unit 53 is created and provided to the output unit 56 via the data bus 55. Output section 53
is composed of a plurality of display areas 53a to 53f. The output unit 56 includes a plurality of display areas 53a to 53a of the display 53.
A plurality of drive circuits 56a to 56f are provided corresponding to 53f. Each drive circuit 56a to 56f is provided with a pair of memories. Image data from the control unit 54 via the data bus 55 is stored in one of the pair of memories. The stored contents are read from the other memory and displayed as an image on the display section 53. Switching between the pair of memories is performed by a memory switching signal derived from the control section 54 and applied in parallel to each drive circuit 56a to 56f via a line 57.

Problems to be Solved by the Invention In the conventional display device 51, memory switching in the drive circuits 56a to 56f of the output section 56 is performed using a common memory switching signal.

Therefore, as shown in FIG. 7, characters are displayed horizontally in a partial area of the screen of the display means 53 at a rate of, for example, 1/60.
When performing scrolling that moves at a rate of 1 dot per second, and displaying still images in the remaining area whose display is switched at intervals of about 1 second or more, the still images that are switched are written at 1/60 seconds. It needs to change. When the screen of the display unit 53 is large and there is a lot of image data to be displayed,
It is difficult for the control unit 54 to rewrite the image data within 60 seconds. Due to such a problem with the processing capacity of the control unit 4, it is necessary to limit the screen size or slow down the scrolling speed, resulting in the problem that high-performance display cannot be performed on a large screen.

An object of the present invention is to provide a display device that can process image data for a display area where image data needs to be rewritten quickly, separately from processing image data for other areas that make up one screen. It is to provide.

Means for Solving NM The present invention provides a display means in which one screen is divided into a first display area and a second display area, and a signal representing a first display content to be displayed by the first display area of the display means. , the second display area to be displayed by the second display area.
a pair of first and second signals for storing the first display content; and a pair of first and second signals for storing the first display content.
having a memory and responsive to a signal from the signal generating means;
a first driving means for storing a first display content in one of the first and second memories, which is switched between the first and second memories, reading the stored content from the other memory and displaying the stored content in the first display area; a pair of third and fourth memories for storage, storing the second display content in one of the third and fourth memories that is switched in response to a signal from the signal generating means; A second memory that reads the stored contents from the other memory and displays it in the second display area.
a driving means; switching the memory in the first driving means;
The display device is characterized in that it includes means for individually switching the memories in the second driving means.

Operation According to the present invention, the screen of the display means is divided into a first display area and a second display area. The first display content to be displayed by the first display area is stored in either the first memory or the second memory, which is alternately switched. 1st
Stored contents are read from the other of the memory or the second memory and displayed in the first display area. the second display content to be displayed by the second display area is stored in one of the third or fourth memories, which is switched to one of the third or fourth memories;
The contents stored in the other memory are displayed in the second display area. Switching between the first and second memories and switching between the third and fourth memories can be performed individually. Therefore, for example, by displaying a still image in the first display area and displaying a scrolling image in the second display area, it is possible to display a still image and a scroll image.

Embodiment FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. The display device 1 includes an input unit 2 implemented by an input device such as a personal computer for inputting characters, images, and the like. Based on the input data input to the input unit 2, a display is performed on the display unit 3. The input data inputted to the input section 2 is given to the control section 4 and converted into display data representing the display content to be displayed by the display section 3.The display data from the control section 4 is sent to the output section 5.
given to. The output section 5 includes a plurality of drive circuits 5a to 5f.
including. Each of the drive ports 15a to 5f is provided corresponding to a plurality of display areas 3a to 3f of the display section 3, which are divided into a plurality of areas. Each of the drive circuits 5a to 5f is provided with a pair of switchable memories, and display data from the control unit 4 via the data bus 6 is stored in one of the memories. Each drive circuit 5a
The store contents are read from the other memory of ~5f,
It is displayed by each corresponding display area 3a to 3f. Memory switching in each of the drive circuits 5a to 5f is performed by a first memory switching signal and a second memory switching signal respectively derived from the control section 4 via the first line 7 and second line 8.

The first memory switching signal is the display area 3a which is the first display area.
-3e are applied to drive circuits 5a to 5e corresponding to the drive circuits 5a to 5e. The drive circuits 5a to 5e are provided with a pair of memories, which are first and second memories, and are switched between storing display data and reading stored contents in response to a first memory switching signal 6. The drive circuit 5f is provided with a pair of third and fourth memories, which are switched between storing display data and reading stored contents in response to a second memory switching signal.

FIG. 2 shows each drive circuit 5a to 5a in the embodiment shown in the first diagram.
FIG. 5 is a block diagram showing the configuration of 5e. Each drive circuit 5a~
5e includes a pair of first and second memories 9.10, an input switching circuit 11, an output switching circuit 12, a parallel/serial conversion circuit 13, and an address generation circuit 14.

The input switching circuit 11 includes first and second three-state (also referred to as "three-state j") buffers 1516, first and second selectors 1.7.18, and one inverting circuit.The input switching circuit 11 includes: In response to a memory switching signal via line 7 from the control unit 4, the memory 9.10 in which display data from the control unit 4 is to be stored is switched.When the memory switching signal is at one logic level, the first third The output of the state buffer 15 is in a high impedance state, and the first
The selector 17 connects one address generation port 14 to the first memory.
' gives an address signal from '. 2nd third state buffer 1
6 supplies display data from the control unit 4 via the data bus 6 to the second memory 1o for storage. Second selector 18
An address signal from the controller 4 is then derived and applied to the second memory 1o. In this way, when the memory switching signal is at one logic level, the second memory 12
An address signal from the 1liIJ controller 4 is applied, and display data via the data bus 6 is stored in the store area addressed by this address signal. When the memory switching signal is at the other logic level, display data is stored in the first memory 9.

Output switching circuit 12 includes third and fourth three-state buffers 20.21. Signals at both ends of the inversion circuit 19 of the input switching circuit 11 are applied to the control terminals of the third and fourth three-state buffers 20.21, respectively. Therefore, when the memory switching signal is at one logic level, the output of the fourth three-state buffer 21 is in a high impedance state.

The third third state buffer 2o is connected to the address generation circuit 14.
The store contents are derived from the first memory 19 addressed by . Similarly, when the memory switching signal is at the other logic level, the second
The stored contents of memory 1o are derived.

The display data derived from the output switching circuit 12 in this manner is converted into a serial signal DATA by the parallel/serial conversion circuit 13.

Address signals LO to L3, a load signal Load, and a clock signal CLK for displaying on the display section 3 are also derived from the address generation port 1i' 814.

The drive circuit 5f also includes a pair of third and fourth memories, similar to the pair of first and second memories 9, 10 of the drive circuits 5a to 5e.
Memory is provided. This memory switching is performed in response to a memory switching signal from the control section 4 via line 8.

Note that a line 7 is connected from the control unit 4 to each drive circuit 5a to 5f.
and line 8 are connected, and each drive circuit 5a
Of course, the selection may be made in steps 5f to 5f.

FIG. 3 is a block diagram showing the configuration of the display unit 3 of the embodiment shown in the first figure, and FIG. 4 is an electric circuit diagram showing the configuration of a light emitting diode (hereinafter abbreviated as rLEDJ) matrix included in the display means 3. . The display unit 3 includes a plurality of basic units 2
20 to 270 are combined in a matrix. Each basic unit 220 to 270 is provided with an empty ED matrix as shown in FIG. The LED matrix 226 is arranged with 16 horizontal rows AO to A15 and 16 vertical columns CO to C15, and picture elements DOO and DOI formed by LEDs are arranged at the intersections of these rows AO to A15 and columns CO to C15. , . Each column CO to C1 of such a 16×16 LED matrix 226
5 is driven by a shift drive diagram B236 provided for each basic panel. Each row AO to A, 15 of the 16×16 LED matrix 226 is driven by a row drive circuit 229. Row driving of the LED matrix 226 is performed by a so-called dynamic driving method in which each row AO to A15 is electrically switched. Such basic panels 220 to 240 are arranged in the horizontal direction, and the LED matrix provided in each basic panel 220 to 240 is
A first display area is configured. Similarly, basic panel 25
The LED matrix 226 provided at 0 to 270 is the second
Configure the display area.

FIG. 5 is a waveform diagram showing signals necessary for displaying on each of the basic panels 220 to 270. FIG. 5(1) to FIG. 5(4) are address signals for selecting rows AO to A15 of the LED matrix 226. The address signal in FIG. 5 (1) is the lowest address signal L
FIG. 5(4) shows the most significant address signal L3. These address signals are transmitted to drive circuits 5a to 5a.
It is derived from the address generation circuit 14 included in 5f.

During the display period of each row, display data corresponding to the display contents to be displayed by the LED matrix 226 of the basic panels 220 to 240 arranged horizontally is transmitted to the drive circuit 5a.
~5f is derived as shown in FIG. 5(5). The display data DATA is transferred within the shift drive circuit 236 provided in each of the basic panels 220 to 240 arranged in the horizontal direction in synchronization with the clock signal CLK shown in FIG. 5(6). FIG. 5(7) shows a Load signal for instructing each shift drive circuit 236 to latch the transferred display data DATA. Figure 5 (5
) to FIG. 5(7) are shown enlarged in the time axis direction. The signal DATA representing display data given to the display section 3 in this manner is the content stored in one of the pair of memory circuits 9 and 1° in the drive circuits 5a to 5f. Display data from the control unit 4 can be stored in the other of the memory circuits 910. Therefore, the basic panels 220 to 2404, which are the first display areas. : When displaying a still image at m, if the memory is not switched in a short time,
Display data for the next image to be displayed on the large screen can be stored. On the other hand, for the basic panels 250 to 270, which are the second display areas, the drive diagram 15
By switching the first and second memory times N9 and 10 of f between storage and reading in a short time, rapid scrolling display, etc. can be performed.

FIG. 6 is a diagram showing a display screen in the embodiment shown in the first figure. The first display area displays still images on a large screen, and the second
Scroll display is performed in the display area. In this way, an image display such as that on the display section 53 of the conventional display device 51 shown in FIG. 7 can be quickly performed.

In the above embodiments, an LED matrix is used as the display means, but a liquid crystal display element,
Of course, a cathode ray tube (abbreviated as CRT) or the like may be used.

In addition, although the first display area displays still images and the second display area scrolls, each display area scrolls at a different speed and direction, and displays still images that change at different intervals. Of course, it is possible.

Furthermore, although the plurality of display areas are represented by the first and second display areas, it goes without saying that the present invention may be applied to other numbers of display areas.

Effects of the Invention As described above, according to the present invention, the display content to be displayed by the display means is displayed when the display content to be displayed by the display means is displayed in the memory of one of the pair of memories, which is different from the memory whose stored content is read out and displayed by the display means. Store in memory. The stored contents stored in the other memory are read out and displayed by the display means by switching the memories. Since such switching can be performed individually for each of the first and second display areas that divide the display means, highly functional display can be performed on a large screen.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a drive circuit in the embodiment shown in the first diagram, and FIG. 3 is a configuration of a display section in the embodiment shown in the first diagram. FIG. 4 is an electric circuit diagram showing the configuration of the LED 7 trix provided on the basic panel of FIG. 3, and FIG.
FIG. 6 is a waveform diagram showing the signal applied to the basic panel in FIG. 3; FIG. 6 is a diagram showing the display screen according to the embodiment shown in FIG. 1;
FIG. 7 is a perspective view of a conventional display device 51, and FIG. 8 is a block diagram showing the configuration of the conventional display device 51. 1... Display device, 2... Input section, 3... Display section,
3a to 3f...display area, 4...control unit, 5...
Output section, 5a to 5f...drive circuit, 6...data bus, 7...first line, 8...second line, 9...
First memory circuit, 10... Second memory circuit, 11...
Input switching circuit, 12...Output switching circuit, 13.Parallel/serial conversion circuit, 14.Address generation circuit Agent Patent attorney Keiichi Figure 4O Figure

Claims (1)

[Claims] Display means in which one screen is divided into a first display area and a second display area; a signal representing a first display content to be displayed by the first display area of the display means; The second to be displayed by the display area
a pair of first and second signals for storing the first display content; and a pair of first and second signals for storing the first display content.
having a memory and responsive to a signal from the signal generating means;
a first driving means for storing a first display content in one of the first and second memories, which is switched between the first and second memories, and for reading the stored content from the other memory and displaying the stored content in the first display area; A pair of 3rd and 4th to store
having a memory and responsive to a signal from the signal generating means;
a second driving means for storing the second display contents in one of the third and fourth memories, which is switched between the third and fourth memories, and reading out the stored contents from the other memory and displaying the stored contents in the second display area; A display device comprising means for individually switching the memory and switching the memory in the second driving means.