JP2000172219A - Display controller, display control method and record medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a display controller capable of performing gradation display only in a necessary area without making a user perform complex operation and capable of attaining the lowering of power consumption. SOLUTION: When a gesture is input by the pen of a degitizer 208 on the display screen of an LCD 207 in which plural windows are opened, on which window the input is performed is discriminated. A window manager 202 makes the window active and when it is a switching request to gradation display according to the result of recognition and when the display of the display screen is a binary display at present, the manager switches the diaplay to the gradation display. Concretely, the addresses of the upper end and the lower end of the window are stored in an area specifying part 503. On the other hand, when the input is a switching request to a binary display, when the display of the screen is gradation display at present, the manager switches the display to the binary display. Concretely, the addresses of the upper end and the lower end of the window are erased from the register of the area specifying part 503.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a display control device, a display control method, and a storage medium capable of causing a display device such as an LCD to perform partial gradation display.

[0002]

2. Description of the Related Art In recent years, LCDs have been mostly used as display devices in portable information processing devices. This is L
One reason is that a CD is smaller, lighter and consumes less power than CRTs and other flat panel displays. However, in the current portable information processing apparatus, that is, the battery-driven information processing apparatus, the battery life cannot be said to be sufficient yet, and low power consumption is being achieved by various methods. Among them, the power consumption of the LCD and the LCD control unit in the entire device is high, and technologies for minimizing power consumption are being studied.

FIG. 11 shows an LCD, particularly a TFT (Thin Film Transister) type or STN (Super
1 is a block diagram illustrating a configuration of an information processing apparatus that uses a Twist Nematic) type LCD as a display device. In the figure, 11
01 is a CPU, 1102 is an LCD control unit (LCD
controller, 1103 is a display memory (Video)
o RAM), 1104 is main memory, 1105 is LCD
Module.

When the display screen needs to be rewritten, the CPU 1101 performs an operation on the main memory 1104 and outputs the operation result to the display memory 110 through the LCD control unit 1102.
Transfer to 3. The LCD control unit 1102 sequentially converts the data of the entire display screen according to the timing signal.
03, and outputs it to the LCD module 1105. The rewritten data in the display memory 1103 is L
When output to the CD module 1105, the display screen changes.

[0005] FIG.
6 is a timing chart showing a signal group sent to a module 1105. In the figure, 320 × 240 dot LC
The case of D is shown. The Dot_Clock signal is a clock for shifting data to individual pixels. The Line_Clock signal is a clock for latching one line of data. Frame_Cloc
The k signal is a scanning start signal for one frame (one screen).
In this example, since there are four data signals, one Dot
Data of four pixels is transmitted by the _Clock signal.

[0006] Due to the principle of operation of the LCD, data must always be sent to individual pixels, and control such as a so-called standby mode cannot be performed. Therefore, a driver for driving the liquid crystal cell is provided with one screen of RAM.
A technology has been devised in which the display can be changed only by outputting only the rewritten data to the LCD module 1105 by incorporating the data. For example, in JP-A-07-230265, when there is no rewriting of the screen, Line_Cl in the signal group shown in FIG.
Sending only the ock signal and the Frame_Clock signal enables display. Then, the screen is rewritten by transmitting all signals and data only in the portion where the rewriting has occurred.

[0007]

However, the above-described conventional display control device is suitable for performing binary display. However, if gradation display is performed, data transmission cannot be stopped. That is, since the gradation display of the LCD is usually expressed by thinning out data on a time axis called frame thinning, it is necessary to always send data even if the display screen is not rewritten, and low power consumption is required. There was a problem that the conversion could not be expected.

Accordingly, the present invention provides a display control apparatus and a display control method capable of performing gray scale display only in a necessary area without causing a user to perform a complicated operation and reducing power consumption. And a storage medium.

[0009]

In order to achieve the above object, a display control device according to a first aspect of the present invention has a built-in memory in which data of a portion that changes a screen is rewritten, and the memory includes In a display control device for performing display control by transferring data to a display device for displaying stored data, an area specifying means for specifying an area where gradation display is performed on the screen, Tone display data generating means for generating data for performing tonal display, setting means for setting an area on the screen, and display form selecting means for selecting a display form in the set area, When the selected display mode is gradation display, gradation display is performed by designating the set area as an area in which the gradation display is performed.

According to a second aspect of the present invention, in the display control device according to the first aspect, when the display mode selected by the display mode selecting means is a binary display, the designated area is released. And perform binary display.

A display control device according to a third aspect of the present invention is the display control device according to the first or second aspect, wherein the setting of the area by the setting means and the display mode by the display mode selecting means are performed by a gesture input of a pen. Is selected.

According to a fourth aspect of the present invention, in the display control device according to the first, second, or third aspect, the display mode selection means includes a plurality of individual windows displayed on a screen in a multi-window. The selection is made for a window.

According to a fifth aspect of the present invention, in the display control device according to the first, second, or third aspect, the display mode selecting means selects the display mode according to an application to be used. And

According to a sixth aspect of the present invention, in the display control device according to the first, second, or third aspect, the display mode selecting means selects the file according to a file to be used. And

According to a seventh aspect of the present invention, there is provided a display control method which includes a built-in memory in which a portion of data which changes the screen is rewritten, and transfers the data to a display device which displays the data stored in the memory. A step of specifying an area on the screen where gradation display is to be performed, a step of generating data for performing gradation display on the specified area, and a step of Setting, and selecting a display mode in the set area,
When the selected display mode is a gray scale display, a step of designating the set area as an area where the gray scale display is performed.

In a display control method according to an eighth aspect of the present invention, in the display control method according to the seventh aspect, when the display mode selected in the step of selecting the display mode is a binary display, the designated area is displayed. And performing a binary display by canceling

A display control method according to a ninth aspect of the present invention is the display control method according to the seventh or eighth aspect, wherein the setting of the area and the selection of the display mode are performed by a gesture input of a pen. And

According to a tenth aspect of the present invention, in the display control method according to the seventh, eighth or ninth aspect, in the step of selecting the display mode, the display mode is displayed on the screen in a multi-window. It is characterized in that selection is made for each window.

The display control method according to claim 11 is the display control method according to claim 7, 8 or 9, wherein in the step of selecting the display mode, the display mode is selected according to an application to be used. It is characterized by.

According to a twelfth aspect of the present invention, in the display control method according to the seventh, eighth or ninth aspect, in the step of selecting the display mode, the selection is made according to a file to be used. It is characterized by.

According to a thirteenth aspect of the present invention, there is provided a storage medium having a built-in memory for rewriting data in a portion that gives a change to a screen, and transferring the data to a display device that displays the data stored in the memory to control display. When performing, on a storage medium storing a program to be executed by a CPU in the display control device, the display control device includes: a unit that specifies an area where gradation display is performed on the screen; Means for generating data for performing gradation display by using the program, wherein the program sets a region on the screen, selects a display mode in the set region, And specifying the set area as an area in which the gradation display is to be performed when the displayed display form is a gradation display.

[0022] The storage medium according to the fourteenth aspect is the first aspect.
3. In the storage medium according to 3, the program includes a step of, when the display mode selected in the procedure for selecting the display mode is a binary display, performing a binary display by releasing the designated area. It is characterized by.

The storage medium according to claim 15 is the storage medium according to claim 1
The storage medium according to claim 3 or 14, wherein the setting of the area and the selection of the display mode are performed by a gesture input of a pen.

[0024] The storage medium according to the sixteenth aspect is the first aspect.
3. The storage medium according to claim 14 or 15, wherein in the step of selecting the display mode, selection is made for each window displayed on the screen in a multi-window.

[0025] The storage medium according to the seventeenth aspect is the first aspect.
3. In the storage medium according to claim 14 or 15, the selection of the display mode is performed according to an application to be used.

The storage medium according to claim 18 is the storage medium according to claim 1
3. In the storage medium according to claim 14 or claim 15, in the procedure for selecting the display mode, selection is performed according to a file to be used.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a display control device, a display control method and a storage medium according to the present invention will be described.

[First Embodiment] FIG. 1 is a block diagram showing a configuration of an information processing apparatus to which a display control device according to a first embodiment is applied. In the figure, 201 is a CPU
It is. Reference numeral 202 denotes a window manager that controls window drawing. 203 is RAM, 204 is ROM, 205 is VRA
M (Video RAM).

Reference numeral 206 denotes an LCD control unit (LCD control)
oller), 207 is a liquid crystal display (LC)
D) and 208 are digitizers (DTZ), and 209 is a digitizer controller (DTZ controller).

First, a method of performing gradation display in a designated area will be described. FIG. 2 is a block diagram showing the internal configuration of the LCD control unit 206. In the figure, 501 is C
A PUI / F, which exchanges data inside the LCD control unit 206 in accordance with an instruction from the CPU 201, and transmits the data to the VRAM 20 via the VRAM I / F 504.
5 to exchange data.

Reference numeral 502 denotes a timing generator,
Timing signal 1 and LC inside LCD control unit 206
A timing signal 2 for D207 is generated. 503
Is an area designating unit, which stores an area for gradation display in a register (not shown). Specifically, the address of the upper end and the address of the lower end of the area for performing the gradation display are stored. Further, it is determined whether the timing signal 3 to the LCD 207 based on the timing signal 2 from the timing generator 502 is within the designated area or outside the designated area.
The data in the VRAM 205 is read out through F504 and sent to the gradation data generation unit 505.

The gradation data generation unit 505 is connected to the VRAM 205
Data read from the memory and the timing generator 50
The data for gradation display is generated based on the timing signal 2 from the LCD 2 and transmitted to the LCD 207. At the same time, if it is within the designated area, the timing signal 502 for the LCD 207 generated by the timing generator 502 is sent to the LCD 207 as the timing signal 3.

On the other hand, the timing signal 3 to the LCD 207
Is outside the designated area, the gradation data generation unit 505
The reading of data from the RAM 205 is stopped, and L
The transmission of the timing signal 3 other than the signals necessary for displaying the screen of the CD 207 is also stopped. Specifically, the Line_Clock signal and the Frame_Clock shown in FIG.
Sends only a signal. According to the above configuration, it is possible to perform gradation display only on the designated area.

In the case of binary display, 1-bit data can be expressed for one pixel of the LCD 207. In the case of multi-gradation display, for example, in the case of 4-gradation display, 2-bit data is required. . For this reason, the VRAM 205 has a two-plane configuration. FIG. 3 is a diagram showing a plane configuration of the VRAM 205. In the case of binary display, only plane 1 is used, and in the case of four gradations, planes 1 and 2 are used. In this case, by setting the plane 1 as the upper bit indicating the density of the pixel, the order of the shading of the pixel does not change even when switching between binary display and gradation display. FIG. 4 is a diagram showing the relationship between the bits of planes 1 and 2 and gradation display and binary display.

FIG. 5 is a flowchart showing an LCD display switching processing procedure. FIG. 6 is a diagram showing a memory map of the ROM 204. The ROM 204 stores, in addition to an operating system (OS), a recognition program used in this processing procedure.

Here, it is assumed that a plurality of windows are opened on the display screen of the LCD 207. FIG. 7 is a diagram showing a display screen of the LCD 207 with a plurality of windows opened. Window Manager
er) 202 is the position of each window on this screen,
Information such as the size is stored.

First, the digitizer (DTZ) 208 determines whether or not there is a figure input by a pen (step S101). If there is a figure input by a pen with the digitizer 208, the digitizer controller (DTZ co.)
(controller) 209 detects the input coordinate group and notifies the CPU 201 of the detection (step S10).
2).

Upon receiving the notification, the CPU 201
The recognition program stored in the storage unit 04 is called to recognize the input coordinate group (step S103). Recognition is
The determination is made as to which gesture or character the input coordinate group is, and on which window the input was made. Since the recognition method is already known, its details are omitted.

When the recognition is completed, the result of the recognition is determined (step S104). That is, if it is determined that the request is a request for switching between gradation display and binary display, the requested window is set to the window manager (W
Inform Manager 202 is notified. On the other hand, if there is no request for switching between gradation display and binary display,
The process returns to step S101.

Upon receiving the notification, the window manager 202 determines whether or not this window is active (step S105), and if not, activates this window (step S106).
That is, it is displayed on the top of the screen. On the other hand, if this window is already active, the process proceeds directly to step S107.

Then, as a result of the recognition, it is determined whether the request is a request for switching to binary display or a request for switching to gradation display (step S107). If it is a request to switch to gradation display, it is determined whether or not the inside of the window is currently binary display (step S108). If the inside of the window is binary display, the display is switched to gradation display (step S109). ), And terminate the process. Specifically, the window manager 202 stores the addresses of the upper and lower ends of the window in the area specifying unit 503. On the other hand, if the inside of the window is a gray scale display, the process is terminated without performing anything.

On the other hand, if the recognition result in step S107 is a request to switch to binary display, it is determined whether or not the window is currently displaying gray scale (step S107).
110), when the inside of the window is a gradation display, the display is switched to a binary display (step S111). In particular,
The window manager 202 deletes the addresses at the upper and lower ends of the window from the register of the area specifying unit 503. On the other hand, if the inside of the window is a binary display, the process is terminated without performing anything.

As described above, the user can perform memory access to only the memory area corresponding to this window area by performing a simple operation of performing a gesture input with a pen on a window whose display method (display mode) is to be switched. Therefore, power consumption can be reduced and usability can be improved.

In the present embodiment, the case of switching between binary display and gradation display has been described, but it is also possible to have three or more stages. Further, the area for performing the gradation display is not limited to one place, but may be a plurality of places. Furthermore, the function of the window manager 202 can also be realized by the CPU 201 executing a program stored in the RAM 203 or the ROM 204.

[Second Embodiment] In the first embodiment, the display method (display mode) is selected by gesture input with a pen, but this may be selected by another method. In the second embodiment, a case where a display method is selected by setting for each application will be described. The configuration and operation different from those of the first embodiment will be mainly described.

FIG. 8 is a block diagram showing the configuration of an information processing apparatus to which the display control device according to the second embodiment is applied. The information processing apparatus includes an application attribute storage unit 801 in addition to the configuration of the first embodiment.

Normally, in a multi-window system, one application operates for one window. The types of files that can be handled by the application are determined, and are classified into applications that handle text files, applications that handle image files, and the like. Therefore, for example, in the case of an application that handles only a text file, switching to binary display can be considered. The user stores in advance in the application attribute storage unit 801 whether binary display or gradation display is to be performed depending on the application to be used.

FIG. 9 is a flowchart showing an LCD display switching process procedure. FIG. 10 shows RAM 203 and ROM
FIG. 4 is a diagram showing a memory map of a memory 204; The ROM 204 stores, in addition to an operating system (OS), a recognition program and applications 1, 2, and 3 used in this processing procedure.

First, it is determined whether a request to open a new application has been made (step S901). Examples of a case where a request to open a new application is made include a case where a user explicitly requests a command by inputting a command, a case where a request is made by communication, and the like.

In step S901, the process waits for a request to open a new application, and when the request is made,
The position and size of the application to be opened stored in the RAM 203 are read (step S90).
2). These values are stored when the application is installed in the information processing apparatus, and are updated when the application is closed.

Based on the read value, the upper and lower addresses of the window to be opened are calculated (step S903). Further, the application attribute storage unit 8
Display method of this application from 01 (display form)
Is read (step S904).

Then, it is determined whether or not the display method of the application is the same as the current display method of the area to be opened (step S905). If they are different, the display method is switched (step S90).
6). The procedure for switching the display method is the same as in the first embodiment. Also, window manager 2
The function of No. 02 can be realized by the CPU 201 executing a program stored in the RAM 203 or the ROM 204, similarly to the first embodiment.

On the other hand, if the display method is the same in step S905, the process directly proceeds to step S907. And a ROM storing the requested application.
The window is read from 204 and opened (step S907).

In the second embodiment, the user simply performs an operation of opening an application, and a display method corresponding to the application is selected. Are switched, and the power consumption of the information processing apparatus can be reduced.

In the second embodiment, the case where the display method is selected is described for each application. However, the present invention is not limited to this, and the display method may be selected based on the attribute of a file opened by the application. Good. further,
In the above embodiment, the device adopting the multi-window system has been described, but the present invention is not particularly limited to this. Further, the display method can be changed at an arbitrary timing during the use of the application by combining with the selection of the display method by the gesture input by the pen of the digitizer in the first embodiment.

The present invention may be applied to a system including a plurality of devices, or may be applied to an apparatus including a single device. Needless to say, the present invention can be applied to a case where the present invention is achieved by supplying a program to a system or an apparatus. In this case, by reading out a storage medium storing a program represented by software for achieving the present invention into a system or an apparatus, the system or the apparatus can enjoy the effects of the present invention.

In the above embodiment, the storage medium for supplying the program modules is the ROM 204. However, the present invention is not limited to this. For example, a floppy disk,
Hard disk, optical disk, magneto-optical disk, CD-
A ROM, a CD-R, a DVD, a magnetic tape, a nonvolatile memory card, or the like can be used.

Further, after the program code read from the storage medium is written into a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, based on the instructions of the program code, The case where the CPU of the function expansion board or the function expansion unit performs part or all of the actual processing, and the function of the above-described embodiment is realized by the processing.

In the above embodiment, the case where the present invention is applied to an LCD has been described. However, the present invention is not limited to the LCD but can be applied to various display devices such as a plasma display and an EL display.

[0060]

According to the display control device of the first aspect of the present invention, a display device that has a built-in memory in which data in a portion that changes the screen is rewritten and displays data stored in the memory is provided. When performing display control by transferring data, the area specifying means specifies an area where gradation display is performed on the screen, and the gradation display data generation means performs gradation display in the specified area. On the other hand, when data is generated, an area on the screen is set by a setting unit, a display mode in the set area is selected by a display mode selection unit, and the selected display mode is a gradation display. Since the set area is designated as the area where the gradation display is performed, the gradation display is performed, without requiring the user to perform a complicated operation, it is possible to perform the gradation display only in the necessary area,
Low power consumption can be achieved. The same effect can be obtained in the display control method according to the seventh aspect and the storage medium according to the thirteenth aspect.

According to the display control device of the second aspect,
When the display mode selected by the display mode selection unit is binary display, the specified area is released and binary display is performed. Therefore, binary display can be performed only in the selected area. The same effect can be obtained in the display control method according to the eighth aspect and the storage medium according to the fourteenth aspect.

According to the display control device of the third aspect,
The area setting by the setting unit and the selection of the display mode by the display mode selection unit are performed by the gesture input of the pen, so that the user can select the display mode by a simple operation. The same effect can be obtained with the display control method according to the ninth aspect and the storage medium according to the fifteenth aspect.

According to the display control device of the fourth aspect,
Since the display mode selection means selects each window displayed on the screen in a multi-window, it is possible to perform display suitable for each window screen.
The display control method according to claim 10 and the display control method according to claim 16
The same effect can be obtained also in the storage medium described in (1).

According to the display control device of the fifth aspect,
The display mode selection means makes selection according to the application to be used, so that display suitable for the application can be performed. For example, an application that handles text files can switch to binary display. In addition, the display mode can be changed at an arbitrary timing during use of the application. Incidentally, claim 1
The same effect can be obtained in the display control method according to the first aspect and the storage medium according to the seventeenth aspect.

According to the display control device of the sixth aspect,
The display mode selection means makes selection according to the file to be used, so that a display suitable for the file can be performed. Even when a file is open, the display mode can be changed at an arbitrary timing. The same effect can be obtained in the display control method according to the twelfth aspect and the storage medium according to the eighteenth aspect.

According to the storage medium of the thirteenth aspect, a memory in which data of a portion that changes the screen is rewritten is built in, and the data is transferred to a display device that displays the data stored in the memory and displayed. When performing control, in a storage medium storing a program to be executed by a CPU in the display control device, the display control device includes: a unit that specifies an area where gradation display is performed on the screen; Means for generating data for performing gradation display in the set area, wherein the program has a procedure of setting an area on the screen, a procedure of selecting a display mode in the set area, When the selected display mode is a gradation display,
A step of designating the set area as an area in which the gradation display is performed, so that the scalability and versatility of the display control device can be improved. Incidentally, claims 14 to 1
In the storage medium described in No. 8, the same effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an information processing apparatus to which a display control device according to a first embodiment is applied.

FIG. 2 is a block diagram showing an internal configuration of an LCD control unit 206.

FIG. 3 is a diagram illustrating a plane configuration of a VRAM 205;

FIG. 4 is a diagram illustrating a relationship between bits of planes 1 and 2 and gradation display and binary display.

FIG. 5 is a flowchart illustrating an LCD display switching processing procedure;

FIG. 6 is a diagram showing a memory map of a ROM 204.

FIG. 7 is a diagram showing a display screen of the LCD 207 with a plurality of windows opened.

FIG. 8 is a block diagram illustrating a configuration of an information processing device to which a display control device according to a second embodiment is applied.

FIG. 9 is a flowchart illustrating an LCD display switching processing procedure.

FIG. 10 is a diagram showing a memory map of a RAM 203 and a ROM 204.

FIG. 11: LCDs, especially TFTs that are currently widely used
(Thin Film Transister) type and STN (Super Twist Ne)
1 is a block diagram illustrating a configuration of an information processing apparatus that uses a matic) type LCD as a display device.

FIG. 12 is a timing chart showing a group of signals sent from the LCD control unit 1102 to the LCD module 1105.

[Explanation of symbols]

201 CPU 202 Window Manager
ager) 203 RAM 204 ROM 207 LCD 208 Digitizer (DTZ) 209 Digitizer controller (DTZ controller)
503) area designation unit 505 gradation data generation unit 801 application attribute storage unit

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2H093 NA55 NC16 NC29 NC50 NC71 ND06 ND34 ND39 NE10 5C006 AA11 AC25 AF02 AF03 AF31 AF38 AF45 BB11 BC16 BF02 BF15 FA05 FA47 5C080 AA10 BB05 DD26 EE17 EE29 FF09 GG02 GG02 GG02 GG01

Claims (18)

[Claims] 1. A display control device which has a built-in memory for rewriting data in a portion giving a change to a screen and performs display control by transferring data to a display device for displaying data stored in the memory. Area designating means for designating an area on which gradation display is to be performed; gradation display data generating means for producing data for performing gradation display in the designated area; and setting the area on the screen Setting means, and display form selecting means for selecting a display form in the set area, wherein when the selected display form is gradation display, the gradation display is performed in the set area. A display control device for performing gradation display by designating an area to be displayed. 2. The display control according to claim 1, wherein when the display mode selected by said display mode selecting means is a binary display, the designated area is released to perform a binary display. apparatus. 3. The display control apparatus according to claim 1, wherein the setting of the area by the setting means and the selection of the display form by the display form selecting means are performed by a gesture input of a pen. 4. The display control device according to claim 1, wherein said display mode selection means selects each window displayed on the screen in a multi-window. . 5. The display control device according to claim 1, wherein the display mode selection unit selects the display mode according to an application to be used. 6. The display control device according to claim 1, wherein said display mode selection means selects the file according to a file to be used. 7. A display control method which incorporates a memory capable of rewriting data in a portion that gives a change to a screen and transfers data to a display device that displays data stored in the memory to perform display control, Specifying a region in which a gray scale display is to be performed, generating data for performing a gray scale display in the specified region, and setting a region on the screen; Selecting a display mode in an area, and, when the selected display mode is a gray scale display, specifying the set area as an area where the gray scale display is performed. Display control method. 8. The method according to claim 1, further comprising, if the display mode selected in the step of selecting the display mode is a binary display, performing a binary display by releasing the designated area. 7. The display control method according to 7. 9. The display control method according to claim 7, wherein the setting of the area and the selection of the display mode are performed by a gesture input of a pen. 10. The method according to claim 7, wherein in the step of selecting the display mode, selection is made for each window displayed on the screen in a multi-window.
Alternatively, the display control method according to claim 9. 11. The display control method according to claim 7, wherein in the step of selecting the display mode, the selection is made according to an application to be used. 12. The display control method according to claim 7, wherein in the step of selecting the display mode, the selection is made according to a file to be used. 13. When a display is controlled by transferring data to a display device for displaying data stored in the memory, the display control device has a built-in memory for rewriting data in a portion that changes the screen. In a storage medium storing a program to be executed by a CPU, the display control device includes: a unit that specifies an area where gradation display is performed on the screen; Means for generating data, the program comprising: a step of setting an area on the screen; a step of selecting a display mode in the set area; and the selected display mode is a gradation display. A procedure of designating the set area as an area in which the gradation display is performed. 14. The program according to claim 1, wherein when the display mode selected in the step of selecting the display mode is a binary display, the program includes a step of releasing the designated area and performing a binary display. 14. The storage medium according to claim 13, wherein: 15. The storage medium according to claim 13, wherein the setting of the area and the selection of the display mode are performed by a gesture input of a pen. 16. The storage according to claim 13, wherein in the step of selecting the display mode, selection is performed for each window displayed on the screen in a multi-window. Medium. 17. The storage medium according to claim 13, wherein in the step of selecting the display mode, the selection is made according to an application to be used. 18. The storage medium according to claim 13, wherein in the step of selecting the display mode, the selection is made according to a file to be used.