JP2003216140A - Display device and method for controlling cache of display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of speeding up an image display processing by managing element images to appear in accordance with a scenario by sorting them by characteristics as appeared images and a method for controlling cache of the display device. <P>SOLUTION: The display device creates/displays displayed images and is provided with a development buffer for performing image development of the element images to be arranged in accordance with the scenario as the appeared images and a cache management means for managing the development buffer as cache areas of the appeared images. The development buffer has a plurality of sorting cache areas for storing the appeared images by sorting them, since the scenario is made into data bas scenario data and includes image specification information and cache sorting information of each appeared image, when the appeared images are stored by performing the image development to them in accordance with the scenario, they are stored by being sorted into any of a plurality of the sorting cache areas based on the cache sorting information and each of a plurality of the sorting cache areas is managed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

The present invention relates to a display device and a cache control method for the display device used in a game machine such as a pachinko machine or an automatic vending machine with a prize.

[0002]

2. Description of the Related Art Conventionally, in this type of display device, various display development stories (scenarios) are stored in a predetermined ROM (corresponding to the animation scenario data ROM 11 in FIG. 1, which is also shown in parentheses below). Aside
For example, the next story is selected based on disturbances (events) and random numbers that are uncertain factors such as user operations, the display content (display image) to be displayed is determined, and the display image based on the determination is selected. Create (draw) and display.
In this case, various element images (data) necessary for display are provided with image numbers for identifying them, so that each element image corresponds to each image number and to save storage capacity. As a compressed image, a predetermined ROM (CG-
It is stored in the ROM 12).

Here, in order to expand (decode) a compressed image, a processing time for the expansion processing is required, and in general, ROM requires more time to access than RAM (the response speed is high). slow). Therefore, in this type of display device, prior to the display, the element images are expanded in the storage area for image expansion (expansion buffer: decode buffer 32 in FIG. 1), and the display screen (display unit 20 in FIG. 1 is displayed. ) Is arranged in a display (screen) buffer (screen buffer 21 in FIG. 1) and sequentially scanned and sent out for display. Further, in order to eliminate the need for re-expansion processing when the previously displayed image is re-displayed, so-called cache processing management (cache control) is performed using the above expansion buffer. If the expansion buffer (cache area) becomes full while creating (arranging) the display image to be displayed next, the oldest image in the update (registration) history order is deleted (area is deleted). The area is released to secure an area required for expansion, and a new element image is expanded in the area thus secured.

[0004]

By the way, the above-mentioned conventional idea, that is, the idea of sequentially deleting images from the earliest registered image (release the area) is as follows. It is based on the idea of "no". However, in the element image (appearing image) displayed (appearing) based on the prepared display development story (scenario), once appearing (appearing) once, it becomes necessary to be almost resident (in the resident case). There will be some).
In addition, there are some scenarios that appear frequently even if you do not go to the resident state.

For example, in the first display image (first frame) GA for one screen shown in FIG. 8A, the element images G2, G3, G4A are arranged on the background image G1 having the size for one screen.
And the element image G5A are arranged (this is the first frame "1
-2-3-4A-5A "), in the second frame, as shown in FIG.
The element images G4B and G5B in which the position of G5A is changed are arranged to create the display image GB (that is, the second frame becomes “1-2-3-4B-5B”). In this case, since the background image G1 (image “1”) and the like are used on both screens (the images “2” and “3” are also the same in the example shown in the figure), it is possible to use the image that has been expanded in the original case. As expected, with the conventional method, when the expansion buffer became full halfway through, the oldest image "1" was deleted (the area was released), so the image "1" was immediately deleted in the second frame. If necessary, it is necessary to perform the expansion process again. Further, if the image expansion again occurs frequently in the subsequent screens, the processing time is wasted.

That is, according to the conventional concept, extra image processing (expansion processing) sometimes wastes processing time, which hinders speeding up of image display processing. If the cache area is increased to increase the number of stored element images, so-called overhead for searching the element images increases, which also hinders speeding up of image display processing.

The present invention provides a display device and a cache control method for the display device, which can speed up the image display processing by classifying and managing the element images that appear according to the scenario according to the characteristics as the appearance image. The purpose is to do.

[0008]

A display device according to claim 1 of the present invention is a display device for creating and displaying a display image of the display screen based on a scenario defining a display development story, wherein: Scenario storage means for storing scenario data in which the scenario is converted into data, compressed image storage means for storing a compressed image which is a source of the elemental image of the display image,
A display buffer for arranging and storing a display image of the display screen, and an element image appearing according to the scenario are arranged as an appearance image in the display buffer, and the image is expanded based on the compressed image and the The expansion buffer stored as an appearance image, and the expansion buffer,
Cache management means for managing the appearance image as a cache area, the expansion buffer has a plurality of classification cache areas for classifying and storing the appearance image, and the scenario data is indicated by itself. Image designation information for designating one or more element images that are appearance images of a scenario, and cache classification information for classifying and storing each of the element images in one of the plurality of classification cache areas. And storing the appearance image in the expansion buffer, the cache management unit classifies and stores the appearance image in any of the plurality of classification cache areas based on cache classification information corresponding to the appearance image. An appearance image classification means, a plurality of classification cache management means for managing each of the plurality of classification cache areas, Characterized in that it has.

In this display device, a display image of a display screen is created and displayed based on a scenario defining a display development story, but a compressed image that is a source of the element image is stored and an element that appears according to the scenario is stored. In order to arrange an image as an appearance image in the display buffer, the image is expanded based on the compressed image and stored in the expansion buffer, and the expansion buffer is managed as a cache area for the appearance image. Here, the expansion buffer has a plurality of classification cache areas for classifying and storing the appearing images, and the scenario is converted into scenario data, and each appearing image (element image) of the scenario shown by itself is stored. It includes image designation information to be designated, and cache classification information for classifying and storing each in one of a plurality of classification cache areas. Therefore, in cache management, when an appearance image is expanded and stored in the cache area, it is classified and stored in one of a plurality of classification cache areas based on the cache classification information corresponding to the appearance image, and each classification image is stored. Manage each of the cache areas. In other words, for example, an image that appears once or extremely rarely on the contrary to an image that is resident or frequently appears is classified as each characteristic, or is classified according to image size (whether or not it is a predetermined size or more). By reflecting the characteristics in the cache classification information, element images that appear according to the scenario can be classified and managed according to the characteristics as the appearance image. This makes it possible to perform extra image (expansion) processing such as image expansion of almost resident images many times, and to secure unnecessary cache areas such as unnecessarily long securing areas for extremely rare images. Therefore, the image display processing can be speeded up.

The cache control method according to claim 2 is
A plurality of element images that appear according to a scenario that defines one or more types of display expansion stories of display screens that change one after another are expanded as appearance images based on compressed images in a buffer for image expansion, and the image expansion is performed. Is a cache control method for a display device for managing the buffer as a cache area of appearance images, wherein a plurality of classification cache areas for classifying and storing the appearance images are provided in the expansion buffer, and the scenario The data-converted scenario data includes image designation information that designates one or more element images that are the appearance images of the scenario shown by the self.
Cache classification information for classifying and storing each in one of the plurality of classification cache areas corresponding to each of the element images, and when the appearance image is expanded and stored according to the scenario, It is characterized in that it is classified and stored in any of the plurality of classification cache areas based on the cache classification information corresponding to the appearance image, and each of the plurality of classification cache areas is managed.

In this cache control method, a plurality of classified cache areas for classifying and storing the appearing images are provided in the decompressing buffer which decompresses the appearing images based on the compressed images. On the other hand, the scenario data is data that is a scenario that defines the display development story of the display screen, and includes image specification information that specifies each element image that is the appearance image of the scenario and multiple classification caches. Cache classification information for classifying and storing any of the areas. For this reason, when the appearance image is expanded and stored according to the scenario, it is classified and stored based on the corresponding cache classification information,
Manages each of a plurality of classification cache areas. As a result, by reflecting the characteristics of the appearance image in the cache classification information, element images that appear according to the scenario can be classified and managed according to the characteristics of the appearance image, and images that are almost resident can be expanded many times. It is possible to reduce an unnecessary image (expansion) process such as performing an operation, secure an unnecessary cache area for an extremely rare image, and speed up the image display process.

[0012]

DETAILED DESCRIPTION OF THE INVENTION A display device according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, first, the display device 1 of the present embodiment receives a command (see CMD in FIG. 2) from the control device (not shown) via the command port CP (S2). According to the received command, the next (time) display image for subsequent development of display processing (new story development) is determined (S3), and the display processing synchronized with the display timing of the display device (display means) 20. Is to do.

As shown in the figure, the display device 1 includes a control unit 10 for controlling the entire display device 1, a display device 20 having a display panel (display screen) made of liquid crystal, and a control unit 10.
A video display processor (Video Display Processor: hereinafter “VDP”) 30 which controls a process (display image sending process (S5) of FIG. 2) for creating (drawing) and displaying a display image in accordance with a command from ing. VDP30 has
A RAM (a so-called video RAM) for arranging the elemental images forming the display image in accordance with the display screen of the display 20.
(VRAM)) and the like, and a screen buffer 21,
Image development management R, which is a work area for other processing
The AM 300 is connected.

The control unit 10 is composed of a CPU and the like,
In addition to the command port CP for receiving a command including a disturbance (event) due to an uncertain factor such as a user's operation, the control unit 10 performs random number generation (random number generation processing (RDM) in FIG. 2) and the like. An animation scenario data ROM 11 that stores various display development stories (scenarios) selected based on the display image data of a plurality of element images that are display candidates according to various commands and various scenarios are compressed images (data ) For display image data (Computer-Graphics RO)
M: hereinafter referred to as "CG-ROM") 12 and a control management RAM 100 which is a work area for other processing.

In the CG-ROM 12, RGB color 3
Color palette group 121, which is a collection of so-called color palettes, in which a plurality of types of used colors expressed as a mixture of primary colors and color numbers serving as their indexes are associated with each other, and image bitmap data that is a collection of compressed images of each element image. Group 1
22 and are stored (the area for them is reserved)
ing.

In the image development management RAM 300 connected to the VDP 30, a color palette for loading the data of the color palette required for display prior to the display so as to correspond to the contents of the CG-ROM 12. Load area (color palette table) 31 of
An area such as a decompression buffer (decode cache area) 32 for securing (decoding) the compressed elemental image prior to the display of the elemental image required for display (decoding into an expanded image) is secured. ing.

Since the display device 1 uses the expansion buffer 32 to perform management (cache control) by so-called cache processing, it also serves as a decode cache area (hereinafter referred to as "decode cache area 32").
That). Therefore, in the control management RAM 100 connected to the control unit 10, an area such as the cache management work area 13 is secured as a work area for cache control including management of the cache area.

As shown in FIG. 2, when the power is turned on, the display device 1 first performs initial setting (S
1) Then, the received command process is performed (S2), and when an interrupt (CMD) due to command reception occurs, the scenario in the animation scenario data ROM 11 is referred to according to the command CMD, and a new story is developed by them. On the other hand, when the new command is not received, the next display image for the original story development (old story development) is determined (S3).

However, in this case, in order to determine the next display image, a random number is generated (RDM) by a random number generation function (a random number generation function utilizing), and the display image is displayed based on the random number. The next display image is selected and determined from the plurality of candidates. Also, time management (S52)
The result (time control signal Ct) is referred to (dotted line in the figure). That is, the next display image shows the presence / absence of a received command, the generated random number (numerical value), the result of time management,
It is determined based on the scenario selected by them. In this case, since the display image based on the previous display image is transmitted to the display device 20, only the next display image is determined here (S3), and the display panel of the display device 20 is displayed. It waits for the display timing of the (display screen), that is, the input (interrupt) of the vertical synchronization signal (hereinafter, “Vsync signal”) VS that triggers the display image data transmission (S4).

Next, when the Vsync signal is input, the process proceeds to the next display image transmitting process (S5). The screen buffer 21 has a plurality of buffers that can be switched with each other, with each buffer having an area capable of storing at least one screen of display image as one buffer. Here, one of them is prepared ( In parallel with sending (displaying) the display image (data) that was created, drawn, and arranged,
A display image for the next time (according to the development of the new or old story) is created (drawn) in another (next) buffer (S5).
1). Further, if it takes time to draw (create an image) and the creation is not completed by the next Vsync signal, it is stated that the next display image creation (drawing) is not performed (the time control signal Ct indicated by the dashed line in the figure is displayed). In order to refer to it in the next display image determination process (S3) by receiving it,
Time management is performed (S52).

Then, when the display for that time is completed by the display image sending process (S5), similarly, the loop process of the next reception command process (S2) to the display image sending process (S5) is performed.

By the way, in the display device 1 of the present embodiment,
By categorizing and managing the element images that appear according to the scenario according to the characteristics as the appearance image, the image display processing is speeded up, and this point will be described in detail below.

First, in this embodiment, the appearing images are classified into two types and handled. One is an appearance image (element image) having an appearance frequency of a predetermined value or more, and is hereinafter referred to as a “protected image”. For example, in the cache management, a developed image (appearing image) such that the display time with respect to the entire scenario is equal to or more than a predetermined ratio, or that the period represented by one data block of the scenario data is resident after first appearing. It is classified as a protected image in which it is advantageous to protect the storage area of without releasing. The other one is an appearance image that does not correspond to a protected image, and will be referred to as a “normal image” below.

In the present embodiment, as shown in FIG. 1, a normal cache (area) 321 for expanding and storing a normal image in a decode cache area 32 and a protection cache for expanding and storing a protected image in an image are stored. (Area) 322
, And a total of two classification cache areas are secured (provided). As shown in FIG. 3, each classification cache area 321, 322 (collectively referred to as “decode cache area 32”) is divided into a plurality of blocks (blocks 00 to xx: xx is a predetermined integer). And then used.

Further, as shown in FIG. 1, the cache management work area 13 has the above-mentioned normal cache (area) 3.
21 and a protected cache (area) 322, a total of two classified cache management work areas, that is, a normal cache (cache management work area) 131 and a protected cache (cache management work area) 132 for managing each of them are provided. Secure (provide). As shown in FIG. 4A, each of the classification cache management work areas 131 and 132 (collectively referred to as “cache management work area 13”) has a decoding cache area 32 (each classification cache area 321 thereof). 322)
The element image (appearance image) newly developed and stored in
Image storage information (search data) in the order of corresponding cache index information (ID number) (ID00 to IDnn: n
n is stored in a block (ID block) of a predetermined integer).

In the cache management work area 13 (each classification cache management work area 131, 132),
If the ID numbers and the image storage information (search data) are associated with each other, the ID numbers may not be in order. Also, the number of protected images is not as large as the number of normal images, so
Without waiting for the turn of each protected image, an ID number is determined in advance and decoded (image development) (protected cache 322
It may be stored.

Here, as shown in FIG. 4B, each image storage information (search data) in this case has an arbitrary ID number IDii (ii is an arbitrary integer of nn or less),
The head block number (head block No .: block 0) in the decode cache area 32 (see FIG. 3) of the element image (data) corresponding to the ID number (developed)
0 to xx), a rear end block number (rear end block No.), and an image number (image No.).

Therefore, when searching for whether the element image used for display has already been expanded (whether the cache is hit or not), the search data stored in the cache management work area 13 is ID. By searching in numerical order, it is searched whether or not there is an image number (image No.) of the image to be displayed. When the image is searched (hit), the head block number (head block No.) of the ID number is searched.
The image in the decode cache area 32 is used based on the trailing end block number and the trailing end block number.
If it is not searched (mis-hit), the process from image expansion is performed again.

Although the first block and the last block are designated in the present embodiment, the first block and the number of blocks from the first block can be designated. Also, since the decode cache area 32 is block managed, the block number is used for searching, but the address in the decode cache area 32 can also be used directly, and the start address and the rear end address, or the start address and from there It can be specified by the number of bytes and words.

By the way, as shown in FIG. 5, in the animation scenario data ROM 11, as shown in FIG. 5A, a scenario information header (data) showing the entire structure of the registered scenario data and a block are created. Each of the n pieces of scenario data (n is a predetermined integer) stored in the memory is stored.

Here, in each arbitrary scenario i data block (i is an arbitrary integer not larger than n), as shown in FIG. 6B, the number of frames defined by the scenario data (in the display 20) After the number of display screens to be displayed: the number of display images created according to the scenario), for each element image that appears according to the scenario, an image number (image No.) for designating an image as an appearance image and its appearance Images (elemental images) are classified into two classification cache areas 3
21, 322 (that is, the normal cache 321 and the protected cache 322) for storing the classified cache (for example, "0" is the normal cache 321, and "1" is the protected cache 322:
The cache classification information) CF is included.
In the present embodiment, the cache flag CF = “1” (indicating a protected image) corresponding to an appearing image having an appearance frequency of a predetermined value or more, and the cache flag C corresponding to another appearing image.
F = “0” (indicating a normal image).

Therefore, the control unit (cache management means)
As cache management (cache control) 10, when an appearance image for the next display image is not registered, when the appearance image is expanded and stored in the decode cache area 32, a cache flag corresponding to the appearance image is displayed. (Cache classification information) 2 (plural) based on CF
The classified cache areas 321 and 322 are classified and stored in one of the classified cache areas 321 and 322 (normal cache 321 or protection cache 322), and each classified cache area is managed.

As a result, in the display device 1 of this embodiment,
The appearance image having a high appearance frequency is expanded and stored in the protection cache 322 as a protection image, and its management is performed based on the protection cache (cache management work area) 132. On the other hand, the other appearing images are expanded and stored in the normal cache 321 as normal images, and their management is performed based on the normal cache (cache management work area) 131.

In this case, for example, for protection cache 132
As long as the maximum capacity of the protected image that appears in one scenario data block is secured, the protected image can be stored during the display according to the scenario of the scenario data block. (Almost resident, etc.)
It is possible to prevent extra image (expansion) processing such as repeatedly expanding an appearance image having a high appearance frequency. Also in this case,
All protected images may be expanded and stored in advance (at the start of the scenario of the scenario data block).

On the other hand, on the side of the normal cache 131, the history control as in the conventional case can be performed.
Since the appearance images having the appearance frequencies higher than a predetermined value are not included, it is rare to perform extra image (expansion) processing such as image expansion for the same appearance image many times.

That is, by reflecting the characteristics of the appearance image in the cache classification information, it is possible to classify and manage the element images that appear according to the scenario by the characteristics of the appearance image. This makes it possible to perform extra image (expansion) processing such as expanding a resident image many times, and to secure unnecessary cache areas such as unnecessarily long securing extremely rare areas. Can be reduced,
As a result, the speed of image display processing can be increased.

In the above-described embodiment, the appearance images having a high appearance frequency are classified as the protection images according to the appearance frequencies. However, for example, the appearance images having a predetermined size or more that requires a long time for expansion and needs to secure a large area are displayed. As a protection image,
It is also possible to classify the images according to the image size (whether the size is a predetermined size or more). In this case, an extra image (expansion) such as expanding a protected image that requires time to expand many times
The processing can be reduced, and it is also possible to avoid unnecessarily allocating an area for a normal image that requires less time and area for expansion, and as a result, speed up the image display processing. You can

In the above embodiment, the cache classification information for classifying and storing the appearing images is specified for each element image (as the cache flag CF), but it is specified for a series of plural element images. Alternatively, one or a series of a plurality of data blocks may be used.

In the above-described embodiment, the protection cache (cache management work area) 132 for managing the protection cache 322 for the protected image and the normal cache for managing the normal cache 321 for the normal image are used. The configuration of the (cache management work area) 131 is shown in FIG.
Although the same configuration is used as described above, they may be configured differently.

For example, as shown in FIG. 6, each piece of image storage information (search data) in the case of the protection cache (cache management work area) 132 is converted to an arbitrary ID number IDii as shown in FIG. For the ID number, only the leading block number and trailing end block number in the protection cache 322 (see FIG. 3) corresponding to the ID number are omitted, and instead of omitting the image number (image No.), as indicated by the dotted line in FIG. An image correspondence cache information work area may be secured, and a correspondence table of ID numbers and image numbers may be prepared as the protection cache 142 as shown in FIG.

Further, in this case, if the ID number is set in accordance with the image number (for example, ID number = image number), it becomes easier to retrieve the ID number from the image number more quickly. Further, in this case, for the protection cache (image corresponding cache information work area) 1 which is the correspondence table of FIG.
42 may be omitted and the search data corresponding to the ID number matching the image number in FIG. 6 may be directly searched as the implicit setting table.

Further, in the ID number column in FIG. 7, predetermined non-stored information indicating a non-stored state in the initial state (predetermined value "FF" or the like) is stored instead, and the element image of the corresponding image number is stored. When the image is expanded in the decoding cache area 32 (the protection cache 322 thereof), the corresponding I
If the D number is stored, it is easy and quick to search for the image number, whether it is unstored or stored, and when stored, from the search data to the location of the appearing image via the corresponding ID number. You can search for.

Further, in the above-mentioned example, the structures of FIGS. 6 and 7 are only for the protected image side, but the same structure can be used for the normal image side. Of course, other changes can be made as appropriate without departing from the scope of the present invention.

[0045]

As described above, according to the display device and the cache control method for the display device of the present invention, the image display processing is performed by classifying and managing the element images that appear according to the scenario according to the characteristics as the appearance image. There is an effect that the speed can be increased.

[Brief description of drawings]

FIG. 1 is a block diagram of a display device according to an exemplary embodiment of the present invention.

FIG. 2 is a schematic flowchart of display processing in the display device of FIG.

FIG. 3 is an explanatory diagram showing a block configuration common to both a normal cache and a protection cache of a decode cache area of FIG.

FIG. 4 is an explanatory diagram showing registration of search data corresponding to management ID numbers for normal cache and protection cache in the cache management work area of FIG. 1 and its data content.

5 is an explanatory diagram showing scenario data in the animation scenario data ROM of FIG. 1 and data contents of respective blocks thereof.

FIG. 6 is an explanatory view similar to FIG. 4, showing a protection cache memory according to a second embodiment.

FIG. 7 is an explanatory diagram showing registered contents for protection cache of an image corresponding cache information work area.

FIG. 8 is an explanatory diagram showing an example of image (screen) transition of a display image.

[Explanation of symbols]

1 Display Device 10 Control Unit 11 Animation Scenario Data ROM 12 CG-ROM (ROM for Display Image Data) 13 Cache Management Work Area 14 Image Corresponding Cache Information Work Area 20 Display (Display Panel) 21 Screen Buffer (Display Buffer) 30 VDP (Video display processor) 31 Color palette 32 Decode buffer (expansion buffer, decode cache area) 100 Control management RAM 121 Color palette group 122 Image bitmap data group 300 Image expansion management RAM CF Cache flag (cache classification information)

Continued front page    F-term (reference) 2C088 AA31 EB55                 5B050 AA10 BA07 BA08 BA10 CA07                       EA10 EA24 FA02                 5B057 CG01 CH07 CH11 CH20                 5C082 AA06 BA12 BA43 BB13 BB15                       BB25 BB42 BB44 DA22 DA42                       DA53 DA86 DA89 MM02

Claims (2)

[Claims] 1. A display device for creating and displaying a display image of the display screen based on a scenario defining a display development story, and scenario storage means for storing scenario data in which the scenario is converted into data. A compressed image storage unit that stores a compressed image that is a source of an element image of a display image, a display buffer for arranging and storing the display image of the display screen, and an element image that appears according to the scenario as an appearance image. A decompression buffer that decompresses an image based on the compressed image and stores the decompressed image as the appearance image for placement in the display buffer; and a cache management unit that manages the decompression buffer as a cache area of the appearance image. The expansion buffer has a plurality of classification cache areas for classifying and storing the appearance images, The scenario data includes image designation information that designates one or more element images that are appearance images of the scenario that the user shows, and classifies each of them into one of the plurality of classification cache areas corresponding to each element image. Cache classification information for storing by storing the appearance image in the expansion buffer, the cache management unit stores the plurality of classification cache areas based on the cache classification information corresponding to the appearance image. A display device comprising: an appearance image classifying unit for classifying and storing the classified image into any one of them, and a plurality of classification cache managing units for managing each of the plurality of classification cache areas. 2. A plurality of element images appearing according to a scenario defining a display expansion story are expanded as appearance images in a buffer for image expansion on the basis of a compressed image, and the buffer for image expansion is displayed in the buffer for appearance images. A cache control method of a display device for managing as a cache area, wherein a plurality of classification cache areas for classifying and storing the appearance images are provided in the expansion buffer, and scenario data obtained by converting the scenario into data is , For storing the image designation information for designating one or more element images that are the appearance images of the scenario indicated by the user, and classifying and storing each of the element images in any one of the plurality of classification cache areas. And cache classification information of, when the appearance image is expanded and stored according to the scenario, A cache control method for a display device, characterized in that it is classified into any of the plurality of classified cache areas based on cache classified information corresponding to an appearance image and stored, and each of the plurality of classified cache areas is managed.