JPH05232914A - Image display device - Google Patents

Abstract

(57) [Summary] [Structure] In an image display device that reproduces and displays a still image, multiple data storage areas corresponding to windows on the display screen are set in the frame memory, and data transfer to this area is not possible. , The area that is not read out for display is selected. In addition, the display switching within the window when the data transfer to this area is completed is performed during the vertical blanking period. [Effect] It is possible to perform high-speed data transfer and display switching without disturbance, and thereby, pseudo moving image display can be performed using still image data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for displaying an image, and more particularly to an image display device suitable for displaying a pseudo moving image by using a still image source.

[0002]

2. Description of the Related Art In recent years, personal computers, workstations and the like have come to be able to handle a large amount of data at high speed due to improvements in processing speed and increase in capacity and speed of storage devices. Image data with a large amount of data,
It became practical to handle with this class of machine,
So-called multimedia support is under way from both software and hardware sides.

On the other hand, the expansion of these machines into the presentation market is remarkable, but here again, the transition from the conventional still image-based presentation to the multimedia presentation in which moving images and voices are sought in order to seek more effective presentations. Have begun. This means that a display device capable of displaying a mixture of a still image and a moving image is required.

As the above display device, for example, in the moving picture window system disclosed in Japanese Patent Laid-Open No. 61-99189, a window is provided on the still image displayed on the screen of the display device, The video can be displayed on. In addition, JP-A-1-126
Japanese Patent No. 686 discloses a video synthesizing device capable of synthesizing and displaying a plurality of moving images on one display device.

In all of the known examples shown here, it is premised that an image is displayed using a plurality of signal sources. Therefore, when considering the configuration of a system using such a display device, the scale becomes large and the handling becomes complicated.
As a means for solving this problem, for example, there is a multimedia system for personal computers, which is introduced on pages 149 to 153 of Nikkei Electronics July 10, 1998 9th page. According to this method, moving images, still images, voices, etc. are collectively recorded on one CD-ROM disc. In addition, with regard to moving images, it is possible to record more than one hour by the high-efficiency compression technology using a dedicated device. The system is a CD-R equipped with a dedicated video board on a personal computer.
This is a configuration in which an OM drive device is connected. In this way, moving images and still images can be handled with a simple system configuration.

On the other hand, a large-scale authoring environment is required to create moving image data. Even in the illustrated multimedia system, it is quite difficult to produce data by the user because a dedicated data compression computer is used and the medium is a CD-ROM. With regard to compression, there is also provided hardware that can be easily used by the user, but the image quality is inferior to that of a dedicated device.

In order to reduce the color information of the image in order to obtain a high compression rate, the frame memory of the image display unit is
It is configured to store a luminance signal and a color signal. In addition, the configuration of the display system hardware is complicated, such as the provision of hardware for interpolating color signals.

[0008]

Regarding image data for presentation, new data is often created according to the content of the presentation rather than diverting existing database-like assets. Especially when used in meetings, a system that can easily create and modify images is required.

Recently, an environment has been established in which a relatively high-quality still image can be created on a personal computer, a workstation, or the like, which is a tool familiar to the user. But,
As mentioned above, it is certain that there is an increasing demand for using data including not only still images but also moving images for presentations.

In the multimedia system, one optical disk can handle both still images and moving images, but it is not able to meet the demand in terms of ease of data creation.

Further, the multimedia type display system hardware configuration focuses on moving image display, and the maximum number of display pixels is 256 × 240 dots, and color display is performed with 9 bits (= 512 colors) per pixel. .. With such resolution and number of colors, it is unsuitable for displaying while maintaining the image quality of high-quality still images (particularly natural images).

The present invention has been made in view of the above circumstances, and in an image display device for reproducing and displaying a still image, a window is provided on the high-quality still image, and a series of still images is displayed in this window. The purpose is to enable effective presentation by easily displaying moving images by displaying continuously.

Another object of the present invention is to prevent the display system hardware from becoming complicated in order to achieve the above object.

[0014]

The above object can be achieved by, for example, performing a high-speed operation of displaying a series of still images one by one so as to correspond to each frame of a continuous movie.

Specifically, the image storage means for storing the still image data, the data expansion means for reading out the image data from the image storage means and expanding the data, and the data expanded by the data expansion means are stored. A frame memory, display control means for displaying the data stored in the frame memory, and window control means for setting a window of an arbitrary size on the screen displayed by the display control means and displaying an image. In a provided image display device, means for setting a plurality of window image data storage areas (hereinafter referred to as data storage areas) corresponding to windows displayed by the window control means in the frame memory, and a series of still images. Is displayed in a window on the display screen in succession so that a pseudo video is played back. In this pseudo moving image reproduction mode, the pseudo moving image data read out from the image storage means and expanded by the data expanding means is stored in the plurality of data storage areas for display without data reading. A function that selectively writes to the area and detects that the data transfer to this data storage area is complete, and switches the display to the data that was just transferred in synchronization with the vertical blanking period of the display immediately after the data transfer. have.

Further, all the data used as the pseudo moving image should be recorded at a higher compression rate than that of a normal still image.

[0017]

In the pseudo moving image reproduction mode, if the data storage area which is not being displayed is selected and the pseudo moving image data is written, the data rewriting state is not displayed and the screen is not damaged, and the blanking period Since it is not necessary to limit the data transfer to a specific period such as, the data transfer can be performed at high speed.

With this, while displaying the data in the data storage area, the data is transferred to another data storage area, and in synchronization with the vertical blanking period of the display immediately after the completion of the data transfer. By switching the display to the data that has been transferred, it is possible to display a visually smooth pseudo moving image.

Further, since the moving image is less likely to be recognized as a moving image by human vision than a still image, all pseudo moving image data should be recorded at a higher compression rate than that of a normal still image so that higher speed data can be obtained. Enable transfer and get a near video look.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of a display circuit in an image display device of the present invention, and FIG. 2 is a block diagram showing an embodiment when the image display device of the present invention is applied to a presentation device.

In FIG. 1, 1 and 2 are a first frame memory and a second frame memory for storing still image data, and 3 is a first frame memory 1 and a second frame memory 2.
A memory management unit that manages addresses and refresh operations when writing data to or reading data from,
Reference numeral 4 reads image data to be displayed from the first frame memory 1 or the second frame memory 2 and performs display control such as overlay display and window display according to various screen control commands given from the outside, and performs D / A conversion described later. A display management unit 5 that sends image data to the unit 5 and generates various synchronization signals for display receives digital image data from the display management unit 4 and converts the digital image data into an analog video signal,
It is a D / A conversion unit for sending to the display device.

In FIG. 2, reference numeral 10 is a CPU that controls the operation of the entire apparatus and data transfer, and 11 is a system bus for transferring data, addresses, commands, etc. between the CPU 10 and each component of the apparatus described later. 12 stores still image data used for presentation,
In accordance with a command from the CPU 10, non-compressed image data is transferred to a display circuit 13 described later, and in the case of a compressed image, an optical disk device for transferring to a compression / decompression circuit 14 described later. Reference numeral 13 denotes the configuration and function of the image display device shown in FIG. The minimum display circuit 14 is, if the still image data to be displayed recorded on the optical disk device 12 is a compressed image, decompresses it and transfers it to the display circuit 13 and vice versa. When recording data, a compression / expansion circuit for compressing image data and transferring it to the optical disk device 12 as necessary, 15
Is a display device for receiving and displaying a video signal from the display circuit 13, and 16 is a remote control device for the operator of the presentation device to send a control signal for turning over the display screen.

First, the outline of the operation of the presentation device (hereinafter, simply referred to as a device) will be described with reference to FIG. Presentation control information (hereinafter simply referred to as control information) indicating the image data used for the presentation and the presentation order of these image data is created by means not shown, and the image is in a compressed or uncompressed state. The control information is the same as the optical disk device 12
It is recorded in. First, a control signal indicating the start of a presentation is sent from the remote controller 16 to the apparatus main body by the operator of the apparatus. When the CPU 10 receives this signal, it first sends the control information to the system bus 11
It is read from the optical disk device 12 via. Next CPU
Reference numeral 10 represents the image data corresponding to the first screen of the presentation indicated by this control information on the system bus 11
It is read from the optical disk device 12 via the, and directly sent to the display circuit 13 for non-compressed data and to the compression / expansion circuit 14 for compressed data. The compression / expansion circuit 14 expands the sent data and transfers it to the display circuit 13. The display circuit 13 converts the image data sent from the optical disk device 12 or the compression / expansion circuit 14 into a video signal and supplies it to the display device 15. In this way, the first screen of the presentation is displayed on the display device 15.
Displayed in.

While the first screen is displayed, the CPU 10
Sends the image data corresponding to the second screen shown in the control information from the optical disk device 12 to the display circuit 13 via the system bus 11. The operation of the display circuit 13 at this time will be described later in detail.

Here, when the operator of the device issues a signal for controlling the turning of the screen from the remote control device 16, this control command is transmitted from the CPU 10 to the display circuit 13.
The display circuit 13 immediately switches the display screen to the second screen.

Hereinafter, the presentation is achieved by repeating the above procedure until the final screen. Note that a dedicated bus is provided for data transfer between the display circuit 13 and the compression / expansion circuit 14 to speed up the data transfer. Therefore, the transfer speed of the optical disk device 12 is dominant in the time from the reading of the image data to the display.

Next, the operation of the display circuit 13 particularly when the display screen is switched will be described with reference to FIGS. 2 and 1. First, the image data corresponding to the first screen sent from the optical disk device 12 or the compression / expansion circuit 14 has the first data according to the write address of the memory generated by the memory management unit 3.
It is stored in the frame memory 1. The display management unit 4 cyclically reads the data of the first screen stored in the first frame memory 1 in synchronization with the screen display cycle, and sends it to the D / A conversion unit 5. At this time, horizontal and vertical synchronizing signals for display are simultaneously generated. The D / A converter 5 converts the sent data into an analog video signal to display the display device 1
Send to 5. On the other hand, while the first screen is displayed,
The memory management unit 4 sends the read permission signal for the second screen to the CPU.
Transfer to 10.

When the CPU 10 receives the permission signal, the second
The image data corresponding to the screen is read from the optical disk device 12 and sent to the display circuit 13 via the system bus 11 and the compression / expansion circuit 14 in the case of compressed data.
The memory management unit 3 generates an address and a write control signal for writing this data in the second frame memory 2. In this way, the image data corresponding to the second screen is written in the second frame memory 2, but at this time, the display management unit 4 still reads the data in the first frame memory 1, that is, the first screen, It is displayed on the display device 15 and is in a state of waiting for a turning control command of the display screen from the operator of the device.

If a turning control command for the display screen is received while waiting for the turning control command, the display management unit 4 immediately changes the read destination of the image data to the frame memory 2 and the read data is converted into the D / A conversion unit. Send to 5.

In this way, while the data in one frame memory is being displayed, control is performed to transfer the next data to the other frame memory.

As described above, the display circuit 13 is configured so that the display screens can be switched instantaneously by alternately accessing the frame memories on the two surfaces. By thus forming the frame memory into a plurality of planes, it is possible to obtain the window display effect described below.

FIG. 3 shows an example of a display screen during window display. 91 is a display base screen, 92 is a window screen, 93 is a memory space of the first frame memory 1, and 9 is a screen space.
Reference numeral 4 represents a memory space of the second frame memory 2, and 95 represents an area where data displayed in the window screen 92 exists. The window display is a display in which another small screen is overlaid and displayed on the base display screen as shown in FIG. The display management unit 4 operates as follows in the window display. The display management unit 4 has a function of independently controlling the coordinate system on the frame memory and the coordinate system on the display screen. That is, it is a function of displaying data in an arbitrary area on the frame memory in an arbitrary area on the display screen. In the example of FIG. 3, the area 93 of the first frame memory 1
Is displayed as a display base screen 91, and the area 9 on the second frame memory 2 is displayed on the display base screen 91.
The area 95 in 4 is displayed as a window screen in an overlapping manner.

Such a window display is possible even if the frame memory has a one-plane structure. However, in the case of a one-plane structure, the data for window display is overwritten on the data of the base screen, so that the display is performed. When moving a window on the screen, the data in the frame memory must be rewritten each time, and there is a drawback that the display becomes slow.

In the example shown in FIG. 3, even when the display position of the window is moved, the display management unit 4 only controls the display position on the display coordinate system of the window, which causes a problem such as a decrease in display speed. Does not occur.

Next, the display operation of the pseudo moving image in this window display will be described. In order for the viewer to recognize the display screen in the window as a video,
A method of continuously rewriting the data in the window during the vertical blanking period of the display can be considered. However, in the normal case, the screen data transfer time to the frame memory is longer than the vertical blanking period. For example, in the case of an NTSC video signal, the vertical blanking period is approximately 830 μsec, and in the 1125/60 high definition television system studio standard (so-called high-definition BTA studio standard) it is approximately 1300 μsec. On the other hand, when taking the CD-ROM standard as an example of the transfer rate of the optical disk device, about 150 KByte / sec (actual transfer rate of data only: transfer rate including additional information is about 176 KByte
/ sec). Also, in a magneto-optical disk device, etc., C
Generally, the data transfer rate is four times or more that of the D-ROM system.

Therefore, here, a drive device having a data transfer rate of about 600 KBytes is considered, and the transfer time is calculated by assuming that the display screen size is high-definition and the window size on the display screen is about 1/16 (480 × 256 dots) of high-definition. Try. In this case, even if it is assumed that the data transfer time to the display circuit is determined only by the transfer rate of the drive device, the maximum amount of data that can be transferred within the vertical blanking period of HDTV is about 820 bytes. The data for one window screen is 360KByte for RGB 24-bit full-color data, and 60K for 16-bit 4-bit data.
It is Byte. Therefore, in the method of rewriting data only within the vertical blanking period, it takes about 450 fields for full color data to complete one window screen, and about 75 fields for 4-bit data, which is 1 to several seconds. The window screen is switched once. This doesn't turn into a pseudo movie.

Therefore, consider using compressed image data. According to the JPEG (Joint Photographic Experts Group) method, which is an international standard for still image compression, 1 / though it does not cause any practical problems.
Data compression of about 10 to 1/15 is possible. Further, if this window display data is limited to being used as pseudo moving image data, it is possible to use the characteristic that moving images are less likely to cause deterioration in image quality than still images for human vision, and up to about 1/30 The compression rate can be increased. Then, the full-color data of the size can be compressed to about 12 KByte, and the drive device having the transfer rate can transfer the data in 0.02 seconds.

30 in the NTSC system and the high-definition system
Since the display speed is 24 frames / second for a frame / second and a motion picture film, if it can display about 10 to 20 frames / second, it will be a pseudo moving image. With the above transfer rate, the data in the window can be rewritten once every two fields, which is a display speed sufficient for a pseudo moving image. Of course, in the case of compressed image data, decompression processing is necessary, but it can be said that the speed is sufficient even if the processing time is added.

The pseudo moving image can be displayed based on the above principle. Next, the operation of a specific device for displaying the pseudo moving image will be described with reference to FIGS. 1, 2 and 4.

FIG. 4 is a conceptual diagram showing the relationship between the display screen displaying a window and the memory area of the frame memory. 31 is a display base screen, 32 is a window screen, and 33 is data of the display base screen 31. The memory space of the first frame memory 1 storing the data, 34 is the second frame memory 2 storing the data of the window screen 32.
And 35 and 36 are window screen transfer areas virtually provided on the memory space of the second frame memory 2. The term "virtual" is used to mean that the window screen transfer area does not refer to a specific area of the frame memory, but is allocated to any area on the frame memory according to conditions such as the size of the window.

It is assumed that the image data for the pseudo moving image is constructed so that one file corresponds to one window screen and is recorded on the optical disk device 12 in a state in which necessary compression is applied. Further, it is assumed that the control command relating to the pseudo moving image reproduction is described in the control information.

The display base screen 31 of FIG. 4 is the data of the first frame memory 1, and the display procedure is as described above. Now, if there is a command to reproduce the pseudo moving image in the control information, the CPU 10 reads the image data file for reproducing the pseudo moving image from the optical disk device 12, and compresses / compresses it.
The operation of sending to the decompression circuit 14 is continuously performed. The compression / expansion circuit 14 decompresses the sent compressed image files one after another and transfers them to the display circuit 13. In the area of the second frame memory 2 in the display circuit 13, the window screen transfer areas 35 to 3 corresponding to the size of the window to be displayed.
6 is secured by the memory management unit 3. The image data sequentially transferred from the compression / expansion circuit 14 has a window screen transfer area 35 for the first screen and a window screen transfer area 36 for the second screen according to the frame memory address generated by the memory management unit 3. , Are alternately written in the window memory area of the second frame memory 2. At this time, the memory management unit 3 generates a signal indicating the completion of transfer each time data transfer to each window screen transfer area is completed.

When the first screen of the pseudo moving image data is written in the window memory area 35 of the second frame memory 2 and the transfer completion signal issued by the memory management unit 3 is detected, the display management unit 4 immediately follows the above procedure. Control is performed to read this data and display it on the window screen 32 on the display base screen 31. Then, the writing of the second screen to the window memory area 36 set in the second frame memory 2 is waited for.

Next, when the display management unit 4 detects the completion of the transfer of the second screen, the display read address is set to the window memory area 36 in the vertical blanking period of the display immediately after that.
By changing to, the display of the window screen 32 is switched to the second screen. Hereinafter, by repeating the above operation, a pseudo moving image is obtained on the display screen.

As described above, according to the present embodiment, when a pseudo moving image is displayed on the window screen, one of the two frame memories is allocated for transferring / displaying the window screen data and a plurality of transfer designated areas are allocated. The pseudo moving image data is alternately transferred to the plurality of transfer designated areas. As a result, data transfer can be performed not only during the display blanking period, but also at high speed. Further, since the pseudo moving image data has a compression rate higher than that of the normal still image data, the data transfer is further speeded up, so that the pseudo moving image closer to the moving image can be obtained. Moreover, since the display switching of the window screen is performed during the blanking period of the base screen, the display is not disturbed.

Next, a second embodiment of the present invention will be described with reference to FIG.
And FIG. 6 will be described. In the present embodiment, the configuration of the display circuit 13 is changed as shown in FIG. 5, and those having the same functions as those in FIG. 1 are designated by the same reference numerals. Figure 1
The difference between and is that the third frame memory 46 is added. The memory management unit 3 and the display management unit 4 in FIG. 1 are configured to manage the frame memories of three planes, respectively, and the codes are assigned to the memory management unit 4 accordingly.
3, the display management unit 44.

FIG. 6 is a conceptual diagram showing the relationship between the display screen displaying the pseudo moving image window and the memory area of the frame memory in this embodiment. The same components as those in FIG. 4 are designated by the same reference numerals. I am wearing it. 56 is a memory space of the third frame memory 46 added in FIG.
Is a window screen transfer area virtually provided on the memory space 56 of the third frame memory 46.

In this embodiment, the basic operation is the first
Since it is the same as the embodiment described above, in the following description, the effect produced by adding the third frame memory will be described. In the first embodiment, an example in which the window screen transfer area is set at a plurality of locations in the same frame memory has been described, but in the present embodiment, the third frame memory 46 is provided as shown in FIGS. The transfer area is set in the second frame memory 2 and the third frame memory 46.

Therefore, the memory management section 43 compresses / compresses
The pseudo moving image data transferred from the decompression circuit 14 to the display circuit 13 is alternately transferred to the window screen transfer areas 35 and 46. As in the first embodiment, the display management unit 44 switches the window display during the vertical blanking period to display a pseudo moving image without display disorder.

The particular effect of this embodiment is that the degree of freedom in setting the window size of the window screen 32 set on the display base screen 31 is improved. That is, it becomes possible to set the window screen size to a size equal to the display base screen size.

Next, a third embodiment of the present invention will be described. In this embodiment, the optical disk device 1 shown in FIG.
Described below are the effects produced by connecting two or more units. FIG. 7 shows an example of the configuration of a presentation device that implements the third embodiment of the present invention.
Those having the same functions as those in FIG. In FIG. 7, reference numerals 12a and 12b denote optical disk devices, respectively, and the number of connected optical disk devices can be increased if necessary. Further, FIG. 5 is used as a diagram showing a structural example of the display circuit in this embodiment. In the following, description of parts that overlap with the previous two examples such as the description of the drawings will be omitted.

Corresponding to the configuration of FIG. 7, a window memory area as shown in FIG. 8 is set, for example. At this time, for example, the data transferred from the optical disk device 12a corresponds to the second frame memory, the data transferred from the optical disk device 12b corresponds to the third frame memory, and the frame memory of the transfer destination and the optical disk device correspond one-to-one. .. In this case, by setting two window screens, it is possible to simultaneously display completely independent pseudo moving images read from two optical disks on the same display screen.

In the three examples described so far, the description has been made assuming that one file of the pseudo moving image data corresponds to one window screen and is recorded in the optical disk device. File structure, as shown in
That is, assume that continuous pseudo moving image data is collected in one file and has a structure having a size almost equal to the capacity of the frame memory when expanded on the frame memory. In this case, the data file read from the optical disk device is expanded at once by the compression / expansion circuit and written in the frame memory in the display circuit. At this time, the data is stored in the frame memory as shown in FIG. 9 (b).

The operation of displaying this data is achieved by continuously switching the read address of the window screen within the vertical blanking period. If there is a pseudo moving image file following one file being displayed, this file may be read out to another frame memory during the display period of the current file. Then, when the display of the data in one of the frame memories is completed, the display of the data read later is immediately performed, and the display of the pseudo moving image can be continued.

As described above, according to the file structure described above, a plurality of window screens can be transferred at once, so that the number of times of data transfer can be reduced, and the transfer efficiency and transfer speed are improved.

In the above description, the area size of one frame memory is just one display screen.
The present invention is effective without being limited to this condition.

[0057]

As described above, according to the present invention, V
It is possible to realize an image display device having a function of easily displaying a pseudo moving image on a window display screen without using a special moving image signal source such as TR, and without causing a significant increase in cost.

Further, it is not necessary to pay attention to the fact that the image data used for reproduction is a moving image, and it can be easily performed with the same feeling as that of the still image data.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a display circuit in an image display device of the present invention.

FIG. 2 is a block diagram showing an embodiment when the image display device of the present invention is applied to a presentation device.

FIG. 3 is a diagram showing an example of a display screen during window display.

FIG. 4 is a conceptual diagram showing a relationship between a display screen displaying a window and a memory area of a frame memory.

FIG. 5 is a block diagram illustrating a configuration example of a display circuit according to a second embodiment.

FIG. 6 is a conceptual diagram showing a relationship between a display screen displaying a pseudo moving image window and a memory area of a frame memory in the second embodiment.

FIG. 7 is a diagram showing a configuration example of a presentation device that realizes a third exemplary embodiment.

FIG. 8 is a conceptual diagram showing a relationship between a display screen displaying a window and a memory area of a frame memory in the third embodiment.

FIG. 9 is a diagram showing another example of a file structure of image data for realizing the present invention and a storage state in a frame memory.

[Explanation of symbols]

1 ... First frame memory, 2 ... Second frame memory, 3 ... Memory management unit, 4 ... Display management unit,
5 ... D / A converter, 10 ... CPU, 11 ... System bus, 12 ... Optical disk device, 13 ... Display circuit, 14 ... Compression / expansion circuit, 15 ... Display device,

Claims (6)

[Claims] 1. An image storage unit for storing still image data, an image data expansion unit for reading compressed image data from the image storage unit and expanding the image data, and at least image data expanded by the data expansion unit. One frame memory, display control means for displaying the data stored in the frame memory, and window control means for setting a window of an arbitrary size on the screen displayed by the display control means and displaying an image An image display device comprising: a means for setting a plurality of image data storage areas corresponding to windows displayed by the window control means in the frame memory; and a series of still images on the display screen window. Has a pseudo video reproduction mode in which pseudo video reproduction is performed by continuously displaying the Means for selectively writing the image data in any of the plurality of data storage areas when the image data read out from the means and expanded by the data expansion means is displayed as a pseudo moving image; When any data is transferred to another data storage area during display, a means to detect the completion of this data transfer and the vertical blanking period of the display immediately after the completion of the data transfer are synchronized. And an image display device having means for switching the display to the data for which the transfer has been completed. 2. The image display device according to claim 1, further comprising a plurality of frame memories, and in the pseudo moving image reproduction mode, a storage area for data to be displayed on the window screen is selected from among the plurality of frame memories. An image display device having a configuration in which a plurality of them are set in the frame memory. 3. The image display device according to claim 1, further comprising a plurality of frame memories, and a storage area for data displayed on the window screen is selected from some of the plurality of frame memories. An image display device, wherein at least one is set in each of the selected frame memory areas. 4. The image display apparatus according to claim 1, 2 or 3, comprising a plurality of the image storage means, a function of reading image data in parallel from the plurality of image storage means, and an image read by the function. An image display device having a function of independently displaying a pseudo moving image in a plurality of windows on a display screen by using data. 5. The image display device according to claim 1, 2, 3 or 4, wherein image data to be displayed as a pseudo moving image in the pseudo moving image reproduction mode is compressed and recorded in the image storage means, The image display device is characterized in that when it is displayed, it is expanded by the expansion means and displayed. 6. The image display device according to claim 1, 2, 3, 4, or 5, wherein the image data displayed in the pseudo moving image reproduction mode is an image of N screens of a window size to be displayed (N is Natural number)
2. An image display device comprising a file for one frame memory.