JPH11202997A - Information processor with pen input function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve convenience by quickening character input using a pen input device. SOLUTION: A CPU 401, when sensing an interruption initiated by the depression or release of a pen input mode switch 2, refers to coordinates data in a character input area of a memory 403 and transfers bit map data of the character input area or bit map data of normal image information to the coordinates of a frame buffer 404. Consequently, image information of the character input area can be displayed overlapping with the normal image information displayed on a liquid crystal display device 3 or not displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus having a computer main body, an image display device, and a pen input device, and having a function of inputting characters by the pen input device. It relates to control processing for input.

[0002]

2. Description of the Related Art As an information processing apparatus having a character input function using a pen input device, there is a portable information terminal "Possible (PMC-1000)" sold by Hitachi, Ltd.

This portable information terminal has a liquid crystal display device as an image display device, and a pressure-sensitive tablet as a transmission type pen input device is superimposed on the liquid crystal display device. Is a portable information terminal with a character input function that allows a pressure-sensitive tablet to be pressed according to image information.

A pressure-sensitive tablet has resistance values in the X-axis direction and the Y-axis direction, applies a voltage to both ends of each axis, and outputs a voltage divided according to coordinates at which a pen is pressed as an analog value. I do. And this analog value is A /
By converting to digital values through a D converter, the CPU reads the coordinates at which the pen is pressed on the pressure-sensitive tablet as digital values. It is also possible to interrupt the moment the pressure-sensitive tablet is pressed with the pen, so that the CPU temporarily stops reading coordinates while the pen is released and waits until the pen is pressed again. I do.

When the user presses a pen to select an area that requires character input, such as a document editing area on the screen, the character input area is automatically superimposed on normal image information and displayed. Information input by a pen in the character input area is received as character input information.

When the character input function based on handwritten character recognition is selected, a rectangular recognition frame is displayed in the character input area,
The handwritten character is recognized from the pen input information input in the recognition frame. As the character input area, in addition to the recognition frame for handwritten character recognition, alphanumeric keyboard input imitating a keyboard, kana input in alphabetical order, Roman alphabet input, symbol input,
Numeric keypad input, JIS code input, radical input, postal code address input, and the like are provided.

[0007]

In such a conventional portable information terminal, normal image information is covered by the character input area in order to display the character input area. However, there is a problem that the area to be formed becomes small and it becomes difficult to see.

Further, since the character input area is forcibly displayed while the document editing area or the like is being selected, it is possible to freely and quickly select whether or not to display the character input area at will of the user. There is a problem that can not be.

In addition, when characters are input by handwritten character recognition, handwritten characters must be contained in a square recognition frame displayed in the character input area, which poses a problem of poor usability.

Further, this handwritten character recognition function is performed for a certain period of time after a character is input to the next recognition frame after a character is input, an icon for starting recognition is selected, or the pen is separated from the pressure-sensitive tablet. In order to determine the boundaries of handwritten characters entered under any of the following conditions, it is necessary to wait for a certain period of time until handwritten character recognition is started after inputting, or move the pen specially to instruct the start of recognition , Operation is troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to make it possible to quickly display / hide a character input area when necessary, or to display a character input area normally even when the character input area is displayed. By reducing the hindrance of the display of the image information of, or by enabling character input with the pen input device without displaying the character input area, or by allowing the input separator to be quickly determined at the time of handwritten character input, An object of the present invention is to make it easy to use by making it possible to quickly input characters using a pen input device.

[0012]

In order to achieve the above object, the present invention relates to an information processing apparatus having a pen input function in which a transparent pen input device is superimposed on an image display device. The character input area is superimposed on the normal image information and displayed while the pen input mode switch is pressed.

Each time the pen input mode switch is pressed, a state in which the character input area is superimposed on the normal image information is switched between a display state and a non-display state.

When the character input area is superimposed on the normal image information and displayed, the normal image information is made visible by making the character input area transparent.

[0015] Further, the information input by the pen while the pen input mode switch is pressed is determined as the information for the handwritten character recognition function without displaying the recognition frame at the time of inputting the handwritten character. When the switch is released, it is determined that it is a character, a character string, a word, a phrase, or a sentence break.

Also, each time the pen input mode switch is pressed without displaying a recognition frame when inputting handwritten characters, the information input by the pen is determined as information for the handwritten character recognition function, or is determined as other information. Changed whether to do.

[0017]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an external view of a portable information terminal with a character input function according to a first embodiment of the present invention.

In FIG. 1, 1 is a portable information terminal having a character input function using a pen input device, 2 is a pen input mode switch for identifying a pen input mode, 3 is a liquid crystal display device as an image display device, 4 is a liquid crystal display device 3
A pressure-sensitive tablet 5 serving as a pen-type pen input device superimposed on the pen 5 is an input pen.

FIG. 2 is an exploded view of each functional means in the portable information terminal with a character input function shown in FIG. In FIG. 2, reference numeral 201 denotes a main control circuit having a control processing function. The other functional units are the same as the functional units shown in FIG.

FIG. 3 is a diagram for explaining the operation of the portable information terminal with a character input function shown in FIG. In FIG.
Denotes image information other than the character input area (hereinafter, referred to as “normal image information”); 302, image information of the character input area;
03 is the display coordinate information of the character input area on the liquid crystal display device 3, 304 is a diagram showing a state where the pen input mode switch 2 is released, 305 is a diagram showing a state where the pen input mode switch 2 is pressed down, and 306 is a pen input mode. 307 Display image of the liquid crystal display device 3 with the switch 2 released
Is a display image of the liquid crystal display device 3 when the pen input mode switch 2 is pressed down. Functional units given the same reference numerals as those of the functional units shown in FIG. 1 are the same functional units.

The operation of the information processing apparatus with a pen input function shown in FIGS. 1 to 3 is as follows. Normally, when the user releases the pen input mode switch 304, only the normal image information 301 is displayed. When the user presses down the pen input mode switch 2 305, the image information 302 of the character input area is displayed in the display coordinate information 3 of the character input area.
In this state, when the user presses the pressure-sensitive tablet 4 (hereinafter referred to as “pen-down”), the coordinates are superimposed on the normal image information 301 according to the liquid crystal display device 3. If the coordinates correspond to the character input area, the pen down is determined to be an instruction input to the character input area. When the pen input mode switch 2 is released, the normal image information 301 is returned again.
Show only.

A more specific embodiment will be described with reference to FIGS.

FIG. 4 is a block diagram showing functional units of the portable information terminal with a character input function shown in FIG. 1, and FIG. 5 is a detailed block diagram of the image display processing unit shown in FIG.

In FIG. 4, reference numeral 401 denotes a CPU, 402 denotes an interrupt controller, 403 denotes a memory, 404 denotes a frame buffer, 405 denotes a display control device, and 406 denotes an A / D.
A converter, 407 is an I / O port, 408 is a computer bus, and 409 is an image display processing unit. Functional units that are the same as the functional units shown in FIGS. 1 and 2 are given the same reference numerals.

In FIG. 5, reference numeral 501 denotes bitmap data of the normal image information 301 held in the memory 403;
2 is bitmap data of the image information 302 of the character input area held in the memory 403, and 503 is character input area coordinate data held in the memory 403.

Reference numeral 504 denotes the flow of bitmap data 501 of the normal image information 301 read out from the memory 403 by the CPU 401 via the computer bus 408.
Reference numeral 05 denotes a flow of bitmap data 502 of the image information 302 of the character input area read from the memory 403 by the CPU 401 via the computer bus 408.
Reference numeral 6 denotes a flow of the coordinate data 503 of the character input area read from the memory 403 by the CPU 401 via the computer bus 408, and reference numeral 507 denotes the coordinate data 503 of the character input area and the bitmap data 502 of the image information 302 of the character input area. A flow of information for writing image information generated by the CPU 401 from the bitmap data 501 of the normal image information 301 to the frame buffer 404 via the display control device 405 is shown. Reference numeral 508 denotes display control of the image information held in the frame buffer 404. Device 405
Shows the flow of information that is periodically transferred to the liquid crystal display device 3. The same functional units as those shown in FIGS. 1 and 4 are denoted by the same reference numerals.

The operation of the functional means shown in FIGS. 4 and 5 is as follows. The CPU 401 stores the bitmap data 501 of the normal image information 301, the bitmap data 502 of the image information 302 of the character input area, and the coordinate data 503 of the character input area in the memory 403, and controls the display of the image information generated from these. The data is written to the frame buffer 404 via the device 405. Then, the display control device 405 converts the image information in the frame buffer 404 into a format suitable for the liquid crystal display device 3 and periodically transfers the format to the liquid crystal display device 3. The liquid crystal display device 3 displays the received image information.

The user presses the pressure-sensitive tablet 4 superimposed on the liquid crystal display device 3 in accordance with the image information displayed on the liquid crystal display device 3 to perform an input operation. , While the pen is down, the coordinates of the pen down on the pressure-sensitive tablet 4 are periodically read through the A / D converter 406, processing corresponding to the pen coordinate information is performed, and the result is returned again. Display control device 40
5 to the liquid crystal display device 3.

The CPU 401 detects when the pen input mode switch 2 is pressed and released by the interrupt controller 402, and determines whether the pen input mode switch 2 is pressed or released. I
Confirm by reading the / O port 407.

FIG. 6 shows a CPU 40 for displaying a character input area when the pen input mode switch 2 is pressed.
1 is a flowchart showing a specific control processing example,
The operation is as follows.

When the CPU 401 detects an interruption due to depression of the pen input mode switch 2 (hereinafter referred to as a switch depression interruption), the CPU 401 refers to the coordinate data 503 of the character input area of the memory 403 (step 601),
By transferring the bitmap data 502 of the image information 302 of the character input area to the coordinates of the frame buffer 404, the image information 302 of the character input area is superimposed on the normal image information 301 displayed on the liquid crystal display device 3. Are displayed (steps 602 and 603).

FIG. 7 is a flowchart of a specific control processing example for returning to the display of the original normal image information 301 when the pen input mode switch 2 is released. The operation is as follows. .

When the CPU 401 senses an interrupt due to the release of the pen input mode switch 2 (hereinafter referred to as “switch release interrupt”), it refers to the coordinate data 503 of the character input area of the memory 403 (step 7).
01), the bitmap data 50 of the normal image information 301
By transferring the coordinate portion in 1 to the frame buffer 404, the image information 302 in the character input area of the liquid crystal display device 3 is deleted, and the display returns to the original normal image information 301 (steps 702 and 703).

FIG. 8 is a flowchart showing a specific example of control processing for transferring image information when the normal image information 301 is updated. The operation is as follows.

When the CPU 401 updates the bitmap data 501 of the normal image information 301 in the memory 403,
The state of the pen input mode switch 2 is read from the I / O port 407 (step 801). If the pen input mode switch 2 is released, the bitmap data 501 of the normal image information 301 corresponding to all updated coordinates is read. Transfer to the frame buffer 404 (Steps 802, 8)
03).

On the other hand, when the CPU 401 updates the normal image information 301 in the memory 403, it reads out the state of the pen input mode switch 2 from the I / O port 407 (step 801), and if the pen input mode switch 2 is depressed. For example, the coordinate data 5 of the character input area of the memory 403
03 (step 804), it is determined whether or not the coordinates are within the character input area for each updated coordinate (step 805).
1 bitmap data 501 to the frame buffer 40
4 (steps 806 and 807).

FIGS. 9 and 10 are flowcharts showing specific control processing examples for realizing the second embodiment of the present invention. The hardware configuration of the second embodiment is the same as the hardware configuration of the first embodiment.

The operation according to the flowcharts shown in FIGS. 9 and 10 will be described below. 1 and 4
The same reference numerals are given to the same functional units as the functional units in FIG. 5, and the duplicate description will be omitted.

FIG. 9 is a flowchart showing an example of control processing for displaying the image information 302 in the character input area when the pen input mode switch 2 is pressed, and the operation is as follows.

The CPU 401 holds a character input area display / non-display flag (hereinafter, referred to as a "display / non-display flag"). This flag has two states: a display state and a non-display state. When the CPU 401 detects the switch press interruption, the CPU 401 refers to the display / non-display flag (step 901). If the switch 401 is in the non-display state, the CPU 401 changes the display / non-display flag to the display state (step 902).
By referring to the coordinate data 503 of the character input area 03 (step 903), the bitmap data 502 of the image information 302 of the character input area is transferred to the coordinates of the frame buffer 404, so that the image displayed on the liquid crystal display device 3 is displayed. The image information 302 of the character input area is superimposed on the image information 301 and displayed (steps 904, 90).
5).

When a switch-press interruption is detected, if the display / non-display flag is in the display state, the display / non-display flag is displayed.
The non-display flag is changed to a non-display state (step 90).
6), the coordinate data 50 of the character input area of the memory 403
3 (step 907), the character input area on the liquid crystal display device 3 is erased by transferring the coordinate portion in the bitmap data 501 of the normal image information 301 to the frame buffer 404, and the original normal image information is deleted. The display returns to the display 301 (steps 908 and 909).

Since the switch release interrupt is not used, it is invalidated. Alternatively, the switch release interrupt may be used instead of the switch press interrupt, and the switch press interrupt may be invalidated.

FIG. 10 is a flowchart showing a specific example of control processing for transferring image information when the normal image information 301 is updated in the second embodiment of the present invention. become that way.

When the CPU 401 updates the bitmap data 501 of the normal image information 301 in the memory 403,
The display / non-display flag is referred to (step 1001). If the display / non-display flag is not displayed, the bitmap data 501 of the normal image information 301 for all updated coordinates is transferred to the frame buffer 404 (steps 1002 and 1003).

On the other hand, when the CPU 401 updates the bitmap data 501 of the normal image information 301 in the memory 403, it refers to the display / non-display flag (step 100).
1) If it is a display state, the coordinate data 503 of the character input area of the memory 403 is referred to (step 1004), and it is confirmed whether or not the coordinates are within the character input area for each updated coordinate (step 1005). If it is outside the input area, the bitmap data 501 of the normal image information 301 is transferred to the frame buffer 404 (step 1006).
1007).

FIG. 11 is an operation diagram of a portable information terminal having a character input function according to the third embodiment of the present invention. The hardware configuration of this embodiment is the same as the hardware configuration of the first embodiment.

In FIG. 11, reference numeral 1101 denotes normal image information; 1102, image information of a character input area having transmission / non-transmission information; 1103, display coordinate information of a character input area on the liquid crystal display device 3; Non-transparent image information in the image information 1102, 1105 is transparent image information in the image information 1102 of the character input area, 11
Reference numeral 06 denotes a display image of the liquid crystal display device 3 when displaying the character input area, and reference numeral 1107 denotes handwritten character information additionally displayed in the character input area. The same functional units as those shown in FIG. 1 are denoted by the same reference numerals.

In FIG. 11, the image information 1102 of the character input area is bitmap data having transparent / non-transparent information for each coordinate.
When superimposing the normal image information 1101, the coordinates 1105 designated to be transparent for the image information 1102 in the character input area are not transferred, so that the normal image information 1101 is less obstructed even when the character input area is displayed. I do. However, when the additional handwritten character information 1107 or the like is displayed in the character input area by handwritten character input or the like, even if the additional information is the coordinate position of the transparent image information, the additional handwritten character information 1107 is overlapped as non-transparent information. Also displayed.

Alternatively, in FIG. 11, the image information 1102 of the character input area is the image information of the character input area having transparent / semi-transparent / non-transparent information, and the coordinates having the semi-transparent information overlap the normal image information 1101. When matching, the normal image information 1101 and the semi-transmissive portion of the image information 1102 in the character input area are combined and transferred as bitmap data of intermediate gradation.

FIG. 12 is an operation diagram of a portable information terminal with a character input function according to a fourth embodiment of the present invention. The hardware configuration of this embodiment is the same as the hardware configuration of the first embodiment.

In FIG. 12, reference numeral 1201 denotes normal image information; 1202, a state in which the pen input mode switch 2 is released; 1203, a state in which the pen input mode switch 2 is depressed; 1204, the pen input mode switch 2 is released. The display image of the liquid crystal display device 3 in the state of being turned off, 1205 is the ink information input to the handwriting input recognition function held in the memory 403, and 1206 is the pen input mode switch 2.
5 is a display image of the liquid crystal display device 3 in a state where is pressed down. The same functional units as those shown in FIG. 1 are denoted by the same reference numerals.

In this embodiment, the information input with the pen when the pen input mode switch 2 is released is determined to be an input operation on the normal image information 1201. However, when the pen input mode switch 2 is pressed down, the pen input is performed. The input information is determined not to be an input operation for the normal image information 1201 but to all input information for the handwritten character recognition function, the input information is recorded in the ink information 1205, and the normal image is displayed on the liquid crystal display device 3. Information 120
1 is displayed with the ink information 1205 superimposed thereon.

The character recognition function is such that, for example, a predetermined time of one second elapses while the pen 5 is released from the tablet 4 (hereinafter referred to as “pen-up”), or the pen input mode switch 2 is released. At this point, it is determined that the input of characters, character strings, words, phrases, sentences, etc. has been separated, and the input information is recognized and an appropriate recognition result is displayed.

FIG. 13 is a flowchart showing a specific control processing example for realizing the fourth embodiment of the present invention. Hereinafter, description will be made using the same reference numerals as those of the functional units in FIGS. 1 and 4.

When the pen down interrupt occurs, the CPU 401 checks the state of the pen input mode switch 2 (step 1301). If the pen input mode switch 2 is released 1202, the normal image information 1201 is displayed until the pen is raised. (Steps 1302 and 1303).

On the other hand, if the pen input mode switch 2 is in the depressed state 1203 when the pen down interrupt occurs, the CPU 401 records the subsequent pen locus in the memory 403 as ink information 1205, and furthermore, the image information of the pen locus. Is transferred to the frame buffer 404 (step 1304). If the pen input mode switch 2 is released while the pen is down (step 1305), the handwritten character recognition for the recorded ink information 1205 is immediately started (step 1308), and the pen input information is ignored until the pen is down again. . If the pen is up while the pen input mode switch 2 is pressed down (steps 1305 and 1306), then, for example, a fixed time of 1 second elapses or the pen input mode switch 2 is released (step 1305). 1307), recognition of handwritten characters with respect to the recorded ink information 1205 is started (step 1308).

When the recognition of the handwritten character is completed, the pen trace portion of the normal image information 1201 is retransferred to erase the pen trace image information in the frame buffer 404, and the ink information is also erased (step S1). 130
9). Then, if necessary, the font of the recognized character is written in the normal image information 1201 and the frame buffer 40
4 is displayed (step 1310).

FIGS. 14 and 15 are flowcharts showing specific control processing examples for realizing the fifth embodiment of the present invention. The hardware configuration of this embodiment is the same as the hardware configuration of the first embodiment.

Hereinafter, the operation of the fifth embodiment will be described, and the same functional means as in FIGS. 1 and 12 will be described using the same reference numerals.

In this embodiment, each time the pen input mode switch 2 is pressed, the character recognition function valid state and the character recognition function invalid state are switched, and the information input by the pen in the character recognition function invalid state is the normal image information. 120
It is determined that the input operation is for the first character.
It is not determined that the input operation has been performed on the input information 1, but all of the input information is for the handwritten character recognition function. The input information is recorded in the ink information 1205, and the ink information 1205 is superimposed on the normal image information 1201 on the liquid crystal display device 3. Display the image information.

Further, the character recognition function determines that an input of a character, a character string, a word, a phrase, a sentence, or the like has been separated when a certain period of time, for example, one second has elapsed with the pen up. Recognize input information and display appropriate recognition results.

FIG. 14 is an example of a flowchart showing a control processing procedure when the pen input mode switch 2 is pressed, and the operation is as follows. 1 and 4 are denoted by the same reference numerals.

The CPU 401 holds a handwritten character recognition valid / invalid flag (hereinafter, referred to as a character recognition valid flag). This flag has two states, a valid state and an invalid state. When a switch-press interruption is detected, the validity / invalidity of the character recognition valid flag is inverted (steps 1401, 1402, 1403).

Since the switch release interrupt is not used, it is invalidated. Alternatively, the switch release interrupt may be used instead of the switch press interrupt, and the switch press interrupt may be invalidated.

FIG. 15 is a flowchart showing a control process when a pen down interrupt occurs. The operation is as follows. The same functional units as those in FIGS. 1, 4 and 12 will be described using the same reference numerals.

When a pen-down interrupt occurs, the CPU 401 checks the state of the character recognition valid flag (step 1501). If it is in an invalid state, the CPU 401 processes the normal image information 1201 as a pen input until the pen is raised (step 1502). , 1503).

On the other hand, if the state of the character recognition valid flag is valid when the pen down interrupt occurs, the CP
U401 records the subsequent pen locus in the memory 403 as ink information 1205, and further transfers the pen locus image information to the frame buffer 404 (step 150).
4). After a pen-up, for example, when a fixed time of 1 second elapses, handwritten character recognition is started for the recorded ink information 1205 (steps 1506, 1507,
1508).

When the recognition of the handwritten character is completed, in order to erase the pen locus in the frame buffer 404, the portion corresponding to the pen locus of the normal image information 1201 is retransferred, and the ink information 1205 is also erased (step 150).
9). Then, if necessary, the font of the recognized character is written in the normal image information 1201 and the frame buffer 4
04 for display (step 1510).

In the fourth and fifth embodiments, a specific handwritten character recognition frame is not provided, but image information for notifying the user of the current character input mode and the like, and an instruction to change settings relating to character input are provided. It is possible to display an icon or the like on the liquid crystal display device 3 in an auxiliary manner.

In each of the embodiments, the pen input device is constituted by a pressure-sensitive tablet and an A / D converter. However, the input device may be replaced with various other types of input devices such as an electromagnetic induction type tablet. is there.

In each of the embodiments, the image display device is constituted by a liquid crystal display device. However, the image display device can be replaced by a display device of various other types such as a CRT display.

In each embodiment, one pen input mode switch has been exemplified. However, a plurality of pen input mode switches can be arranged at easy-to-operate positions.

In each embodiment, a dedicated switch is provided as a pen input mode switch. However, in the case of a device having a keyboard, any key on the keyboard can be used instead.

In each of the embodiments, the pen input mode switch is disposed near the image display device. However, the pen input mode switch is provided in the pen, and the signal is transmitted to the main control circuit wirelessly or by wire. It is also possible to do so.

In each embodiment, all processes such as pen input and handwritten character recognition are performed by one CPU. However, a part or all of the processes can be replaced by a dedicated CPU or hardware. is there.

In each embodiment, a dedicated frame buffer is provided for displaying images.
By sharing the PU with the image display device, it is possible to omit the dedicated frame buffer.

[0078]

According to the present invention, the user can quickly control the display / non-display of the character input area when necessary, and can display a normal image even if the image information of the character input area is displayed. It is possible to input characters with a pen input device without displaying image information in the character input area with little hindrance to the display of information, and to be able to quickly determine the break of input when inputting handwritten characters, etc. It is possible to make the character input by the pen input device easy to use.

[Brief description of the drawings]

FIG. 1 is an external view of a portable information terminal with a character input function which is a first embodiment of a device to which the present invention is applied.

FIG. 2 is an exploded view of the portable information terminal with a character input function shown in FIG.

FIG. 3 is an operation explanatory diagram of the portable information terminal with a character input function shown in FIG. 1;

FIG. 4 is a block diagram showing functional units of the portable information terminal with a character input function shown in FIG. 1;

5 is a detailed block diagram of an image display processing unit in the functional unit shown in FIG.

FIG. 6 is a flowchart illustrating a control processing procedure of a CPU for displaying a character input area when a pen input mode switch is pressed.

FIG. 7 is a flowchart illustrating a control processing procedure for returning to the original normal image information display when the pen input mode switch is released.

FIG. 8 is a flowchart illustrating a control processing procedure for transferring image information when normal image information is updated.

FIG. 9 is a flowchart illustrating a control processing procedure for displaying a character input area when the pen input mode switch 2 is pressed in the second embodiment of the present invention.

FIG. 10 is a flowchart illustrating a control processing procedure for transferring image information when normal image information is updated in the second embodiment of the present invention.

FIG. 11 is an operation explanatory view of a portable information terminal with a character input function according to a third embodiment of the present invention.

FIG. 12 is an operation explanatory diagram of a portable information terminal with a character input function according to a fourth embodiment of the present invention.

FIG. 13 is a flowchart illustrating a control processing procedure for realizing a fourth embodiment of the present invention.

FIG. 14 is a flowchart illustrating a control processing procedure when the pen input mode switch 2 is pressed in the fifth embodiment of the present invention.

FIG. 15 is a flowchart illustrating a control processing procedure when a pen-down interrupt occurs in the fifth embodiment of the present invention.

[Explanation of symbols]

 2 Pen input mode switch 3 Liquid crystal display device 4 Pressure sensitive tablet 201 Main control circuit 401 CPU 402 Interrupt controller 403 Memory circuit 404 Frame buffer 405 Display control device 406 A / D converter 407 I / O port 408 Computer bus 409 Image display processing unit

Claims (6)

[Claims] An information processing apparatus having a pen input function in which a transmission type pen input device is superimposed on an image display device, wherein a pen input mode switch is provided, and while the pen input mode switch is pressed, An information processing apparatus with a pen input function, wherein a character input area is displayed so as to be superimposed on normal image information. 2. An information processing apparatus having a pen input function in which a transmission type pen input device is superimposed on an image display device, wherein a pen input mode switch is provided, and each time the pen input mode switch is pressed, character input is performed. An information processing apparatus with a pen input function, wherein a mode in which a display area is superimposed on normal image information and a mode in which the area is not displayed is switched. 3. The character input area according to claim 1, wherein in the mode in which the character input area is superimposed on the normal image information, the normal image information can be seen through the character input area. Information processing device with pen input function. 4. An information processing apparatus having a pen input function having a function of recognizing a pen-input handwritten character by superimposing a transparent pen input device on an image display device, wherein a pen input mode switch is provided. A pen input function characterized in that information input by a pen while the pen input mode switch is pressed is determined as information for a handwritten character recognition function without displaying a recognition frame at the time of handwritten character recognition. Attached information processing device. 5. A handwritten character recognition information input by a pen while the pen input mode switch is pressed, wherein the character, character string, word, and phrase are recognized when the pen input mode switch is released. Alternatively, an information processing apparatus with a pen input function, wherein it is determined that the sentence is a break. 6. An information processing apparatus with a pen input function having a function of recognizing handwritten characters input by a pen by superimposing a transparent pen input device on an image display device, wherein a pen input mode switch is provided. Each time the pen input mode switch is pressed without displaying the recognition frame at the time of handwritten character recognition, it switches between judging the information input by the pen as information for the handwritten character recognition function and other information. An information processing apparatus having a pen input function.