Mobile terminal device and display control method

The present invention relates to a mobile terminal device provided with a touch panel and a touch pad, and more particularly to a mobile terminal device for improving the operability of the touch panel by the device user.

Some mobile terminal devices such as mobile phones and PDAs (Personal Digital Assistants) are equipped with a touch panel and a touch pad. Here, the touch panel includes a sensor of various methods (for example, capacitance method, resistance film method, infrared shading method, etc.) for detecting the position pressed by the device user and a display arranged on the lower surface of the sensor. The touch pad is distinguished as referring to a device including and configured, and the touch pad as referring to a pointing device including the sensor and having an unconstrained positional relationship with a display. A mobile terminal device provided with a touch panel or a touch pad can provide an intuitive operation to a device user.

For example, Patent Document 1 discloses a mobile terminal device that can hold a mobile terminal device with one hand and operate a touch pad with that hand.<patcit num="1"><text>Special Table 2000-515702 Gazette</text></patcit>

<p> FIG. 8 shows a front view (a) and a rear view (b) of the mobile terminal device of Patent Document 1. The mobile terminal device of Patent Document 1 is provided with a display 81 on one surface and a touch pad 82 on the back surface of the display 81. Here, the surface provided with the display 81 is the front surface, and the surface provided with the touch pad 82 is the back surface. In FIG. 8, the device user holds the mobile terminal device with his / her left hand and operates by bringing the tip of the index finger 83 into contact with the touch pad 82. Of the touchpads 82, those placed in areas that cannot be reached even when the index finger 83 is fully extended have very low one-handed operability.</p><p> Further, when the tip of the finger of the hand is brought into contact with the touch pad while holding the mobile terminal device with one hand as shown in FIG. 8, the operability of the touch pad may be deteriorated in the case shown in the lower part of FIG. .. That is, as shown in the upper part of FIG. 9, when the tip of the index finger 83 is brought into contact with the part of the touch pad 82 away from the base of the index finger 83 (the part indicated by the dotted line 8a), the device user presses the index finger 83. It can be operated in a comfortable posture without bending so much, but on the other hand, as shown in the lower part of FIG. 9, the tip of the index finger 83 is located near the base of the index finger 83 (the part indicated by the dotted line 8b) on the touchpad 82. When the device is brought into contact with the device, the user of the device must bend the index finger 83 greatly, and is forced to operate in a cramped posture. In order to operate the part indicated by the dotted line 8b in the above comfortable posture, the device user needs to pick up the mobile terminal device, but each time the touch pad 82 is operated, the device user is made to pick up the mobile terminal device. That is not a preferable operability. The form of the touch panel or touch pad with good operability depends on the size and shape of the mobile terminal device provided with the touch panel or touch pad.</p><p> The present invention has been made in view of the above circumstances, and is a mobile terminal device capable of improving operability when the mobile terminal device is held with one hand and the touch panel or touch pad is operated with the hand. An object of the present invention is to provide a display control method.</p>

<p> In the mobile terminal device of the present invention, the display position on the display unit is determined based on the display unit that displays various information, the press detection unit that detects the press, and the press region in which the press is detected by the press detection unit. It includes a control unit that controls a fixed display position of a display target.</p><p> The display control method of the present invention detects a pressed area and controls the display position of the display target in which the display position on the display unit is fixedly set based on the pressed area where the press is detected. , The display target whose display position is controlled is displayed.</p><p> With this configuration, it is possible to control the display content displayed on the display unit based on the pressing area detected by the pressing detection unit (touch pad), so that the optimum interface according to the operation of the device user by the pressing detection unit (touch pad). Can be provided.</p><p> Further, in the portable terminal device of the present invention, the control unit passes through at least one point of the pressing region where the pressing is detected by the pressing detection unit, and calculates a straight line whose inclination is the longitudinal direction of the pressing region. When the intersection of a plurality of straight lines calculated for each pressed area by the straight line calculation unit is included in a predetermined range, the position calculation unit for calculating the average position obtained by averaging the intersection points and the average position Based on the above, the display control means for controlling the display position of the display target is included.</p><p> With this configuration, the position of the base of the finger operating the press detection unit (touch pad) can be specified. As a result, the user interface that reflects the position of the root makes it possible to hold the mobile terminal device with one hand and improve the operability when operating the touch panel or the touch pad with that hand.</p><p> Further, the mobile terminal device of the present invention includes a device in which the straight line calculation unit calculates the long axis of the pressing region approximated as an ellipse as the straight line.</p><p> With this configuration, the position of the base of the finger can be specified with high accuracy.</p><p> In addition, the mobile terminal device of the present invention includes a device in which the display control unit controls the display position of an image as a display target to be displayed on the display unit based on the average position.</p><p> With this configuration, the device user does not have to bend the finger for operating the touch pad to operate it, so that the device user can operate it comfortably.</p><p> Further, the mobile terminal device of the present invention includes a device in which the display control unit controls a range pointed to by a pointer displayed on the display unit based on the average position.</p><p> With this configuration, it is possible to provide an operating environment in which it is easy to specify the target displayed on the display unit even when the tip of the finger is brought into contact with a portion of the touch pad near the base of the finger.</p>

<p> According to the mobile terminal device and the display control method of the present invention, when the mobile terminal device is held by one hand and the touch panel or the touch pad is operated by the hand, the operability can be improved.</p>

Hereinafter, the mobile terminal device according to the embodiment of the present invention will be described. First, the configuration of the mobile terminal device according to the embodiment of the present invention will be described with reference to the configuration diagram of the mobile terminal device according to the embodiment of the present invention shown in FIG. The mobile terminal device according to the embodiment of the present invention includes a display unit 11, a touch pad 12, an operation key 13, an execution program storage unit 14, an arithmetic information storage unit 15, and a control unit 16. The display unit 11 is composed of a liquid crystal display and an organic EL display, and displays various information based on the control signal output from the control unit 16. The touch pad 12 is composed of sensors of various methods (for example, capacitance method, resistance film method, infrared ray shading method, etc.) that detect the position pressed by the device user, and controls the signal detected by the sensor. Output to 16. The operation key 13 is composed of a number from 0 to 9 and a key to which a specific function is assigned, and outputs an input signal received from the device user to the control unit 16. The execution program storage unit 14 stores various programs executed by the control unit 16. The arithmetic information storage unit 15 stores the data output as a result of the control unit 16 executing the program.

Next, the flow of processing by the mobile terminal device according to the embodiment of the present invention and the contents of each processing will be described. FIG. 2 shows a flowchart carried out by the mobile terminal device according to the embodiment of the present invention, and FIG. 3 shows a diagram illustrating a long-axis calculation process carried out by the mobile terminal device according to the embodiment of the present invention. The drawings for explaining the process of specifying the root position performed by the mobile terminal device according to the embodiment of the present invention are shown below.

First, when the device user brings the tip of a finger into contact with the touch pad 12 and operates the touch pad 12, the touch pad 12 outputs a signal indicating the pressed position on the touch pad 12 to the control unit 16 ( Step S201). For example, when the touch pad 12 is of the capacitance type, the touch pad 12 in which the capacitors are arranged in a grid pattern is arranged at the pressed portion rather than the capacitor arranged at the unpressed portion. Outputs a signal with a lower voltage value from the existing capacitor. Therefore, from the voltage value of the signal output from the touch pad 12, the control unit 16 determines the pressed position coordinates on the touch pad 12 (in FIG. 3A, the pressed position coordinates are black in the matrix. It corresponds to a filled cell. The set of these cells is hereinafter referred to as a pressed area).

Subsequently, the control unit 16 executes the contact area recognition program stored in the execution program storage unit 14, and whether or not the area of the pressed area, that is, the total number of cells constituting the pressed area is larger than a predetermined value. Is determined (step S202). If the area of the pressed area is larger than the predetermined value (steps S202, Y), the control unit 16 executes the long-axis calculation program stored in the execution program storage unit 14 and performs the processing described below. On the other hand, if the area of the pressed area is smaller than the predetermined value (steps S202, N), the control unit 16 waits for the signal output from the touch pad 12 without performing the processing described below.

If the area of the pressed area is larger than the predetermined value, the control unit 16 executes the edge extraction process for the pressed area (step S203). The control unit 16 determines the position coordinates of the contour of the pressed area to which the edge extraction process has been performed (in FIG. 3 (b), the position coordinates of the outline of the pressed area correspond to the black-painted cells in the matrix). recognize. Further, the control unit 16 executes an ellipse approximation process using the position coordinates of the contour of the pressed area extracted by the edge extraction process (step S204. The ellipse shown in FIG. 3C is calculated by the ellipse approximation process). Corresponds to the ellipse.). For the ellipse approximation process, for example, the least squares method is used. The control unit 16 calculates a straight line (corresponding to the straight line shown in FIG. 3D) including the long axis of the elliptical equation calculated in this way, and stores parameters representing the linear equation of the straight line in the arithmetic information storage. Store in part 15 (step S205). After that, the control unit 16 performs the above processing each time a signal is input from the touch pad 12.

When the device user touches the tip of the finger to the touch pad 12 multiple times to perform an operation by the touch pad 12, and the control unit 16 stores a predetermined number of the above parameters in the calculation information storage unit 15 (step S206, step S206). Y), the control unit 16 executes the intersection calculation program stored in the execution program storage unit 14 to calculate the position coordinates of the intersection between each straight line and the other straight line (step S207). FIG. 4 (a) shows the case where the position coordinates of the intersections of each straight line and the other straight lines are calculated when the above five parameters are stored, and the intersections are indicated by (blackened). ..

Subsequently, the control unit 16 executes the root position specifying program stored in the execution program storage unit 14 to calculate the average value of the calculated position coordinates of the plurality of intersections (step S208). In Fig. 4 (b), the average value of the position coordinates of the intersection is indicated by "" (black). Then, the control unit 16 is based on the difference between each of the position coordinates of the intersection ( in FIG. 4 (b)) and the average value of the position coordinates of the intersection ("" in FIG. 4 (b)). , Calculate the variation of each position coordinate of the intersection with respect to the average value of the position coordinates of the intersection (step S209). Explaining an example of the variation calculation method with reference to FIG. 4 (b), the difference in the X-axis direction between each of the position coordinates of the intersection and the average value of the position coordinates of the intersection (xa, xb, in FIG. 4 (b), Two formulas f (x) = xa that quantify the variability from xc, ...) and the intersection in the Y-axis direction (ya, yb, yc, ... in Fig. 4 (b)).²+ xb²+ xc²+ ..., g (y) = ya²+ yb²+ yc²Calculate + ... If the numerical values of the two mathematical formulas f (x) and g (y) expressing the variation are smaller than the predetermined values (steps S210 and Y), the control unit 16 applies the touch pad 12 to the average value of the position coordinates of the intersections. Assuming that there is a base of a finger in contact, the average value of the position coordinates of the intersection is recognized as the base position (step S211).

In the mobile terminal device according to the embodiment of the present invention, the above-described processing is performed to recognize the position of the base of the finger that operates the touch panel 12. In calculating the position of the base of the finger, the following points are focused on in the above-mentioned processing. That is, the first is that the contact surface of the finger when operating the touchpad is elliptical, and the second is the ellipse when the tip of the finger is brought into contact with a portion away from the base of the finger when operating the touchpad. The point where the root is located on the extension of the long axis of the shape, the third is that even if the location of the ellipse on the touchpad is different, unless the mobile terminal device is picked up, the long axis of those ellipses will be It is a point that concentrates on the position of the base of the finger. Figure 5 shows the characteristics of the finger contact surface when operating the touch panel.

As shown in FIGS. 5 (a) and 5 (b), even when the tip of the finger is brought into contact with a part away from the base of the finger when operating the touch pad, the tip of the finger is placed near the base of the finger. Even in the case of contact, the contact surfaces 51 and 52 of the finger with respect to the touch pad 12 have a shape close to an ellipse. However, when the tip of the finger is brought into contact with a portion away from the base of the finger, the area of the contact surface 51 of the finger is larger than that when the tip of the finger is brought into contact with a portion near the base of the finger. Utilizing this feature, in step S202 of the above-mentioned process, it is distinguished whether the pressed portion is a portion away from the base of the finger or a portion close to the base of the finger according to the size of the pressed area. .. The threshold value for determining the size of the pressed area can be set as, for example, the average value of the pressed areas calculated up to that point.

In addition, when the tip of the finger is brought into contact with a portion away from the base of the finger, the pressing region having a relatively large area is approximated by utilizing the fact that the base is located on the extension line of the long axis of the ellipse. The direction of the finger base is specified from the long axis of the ellipse, and the position 53 of the finger base is specified from the intersection of the long axis and the long axis of the ellipse that approximates another pressing region. Considering that the position of the base of the finger changes when the device user picks up the mobile terminal device, in step S207 of the above-mentioned process, the intersection points are selected from a plurality of new parameters stored. May be calculated. As a result, even if the position of the base of the finger changes due to the device user picking up the mobile terminal device, the position can be specified by following the change.

When the mobile terminal device is held with one hand and the touch panel or touch pad is operated with that hand by realizing the user interface as in the embodiment described later by using the position of the finger base calculated in this way. In addition, the operability can be improved. Hereinafter, an example of a user interface using the position of the base of the finger that operates the touch pad will be described.

In the first embodiment, the mobile terminal device according to the embodiment of the present invention changes the display content displayed on the display unit 11 according to the position of the base of the specified finger. Some user interfaces installed in mobile terminal devices in recent years use icons and launcher menus that visually recognize a function and accept an execution instruction of the function by a simple operation. FIG. 6 shows the relationship between the display example by the mobile terminal device of the first embodiment of the present invention and the root position at the time of display.

As shown in FIG. 6, icons such as a telephone directory, a camera, a menu, music, and an email, and a launcher menu are displayed at a predetermined distance from the specified finger base position 53. As a result, the device user does not have to bend the finger for operating the touch pad 12 to operate it, so that the device user can operate the touch pad 12 comfortably.

Specifically, first, the execution program storage unit 14 in the mobile terminal device of the first embodiment displays programs for various functions (phone book, camera, music, mail, etc.) and icons for instructing execution of various functions. It is stored in association with each other.

In addition, the icons corresponding to various functions are the initial arrangement information displayed on the display unit 11 when the touch pad is not operated in the menu display (for example, 20 pixels in the X-axis direction with the upper left corner of the display unit 11 as the base point, Y. Axial direction 100 pixels, etc.) and the image size are stored respectively.

Here, the control unit 16 uses the above calculation method when the touch pad 12 is operated while the display unit 11 displays a menu of a plurality of icons corresponding to various functions according to the initial arrangement information. Recognize the position of the base of the user's finger.

Then, the control unit 16 determines whether or not there is an icon included in the distance range from a certain distance range centered on the root position and initial arrangement information of the plurality of icons. When there is no icon included in the distance range, the control unit 16 displays a plurality of icons on the display unit 11 according to the initial arrangement information.

On the other hand, when there is an icon included in the distance range, the control unit 16 displays so that the icon is not included in a certain distance range centered on the root position. For example, all or a specific icon may be moved and displayed at a position separated from the initial arrangement information by a predetermined distance, or the image size of the icon may be reduced. As a result, it is not necessary to bend the finger for operating the touch pad 12 to operate it, so that the touch pad 12 can be operated comfortably.

In addition, a screen that does not need to be operated (for example, a TV broadcast screen if it is a mobile terminal device that can receive TV broadcasts, or a mobile terminal device that can play audio data) near the position 53 at the base of the specified finger If so, the music information of the audio data being played, etc.) may be displayed.

Specifically, first, the execution program storage unit 14 in the mobile terminal device of the first embodiment provides programs for various functions (television broadcasting, audio, etc.) including screens that do not need to be operated (hereinafter, operation-free screens). I remember. Then, in the operation-free screen display of various functions, the initial arrangement information to be displayed on the display unit 11 when the touch pad is not operated (for example, 20 pixels in the X-axis direction and 100 in the Y-axis direction with the upper left corner of the display unit 11 as the base point). (Pixels, etc.) and the image size are stored respectively.

Here, when the touch pad 12 is operated while the display unit 11 is displaying various functions, the control unit 16 recognizes the position of the base of the finger of the device user by using the above calculation method.

Then, the control unit 16 determines whether or not there is an operation-unnecessary screen displayed outside the distance range from a certain distance range centered on the root position and the initial arrangement information of the operation-free screen.

When there is no operation-free screen outside the distance range, the control unit 16 displays the operation-free screen on the display unit 11 according to the initial arrangement information.

On the other hand, when there is an operation-free screen outside the distance range, the control unit 16 displays so that the operation-free screen is included within a certain distance range centered on the root position. For example, the television broadcast screen may be displayed along the edge of the display unit closest to the base of the finger. As a result, it is not necessary to bend the finger for operating the touch pad 12 to operate it, so that the touch pad 12 can be operated comfortably.

In addition, it is displayed for operations that are disadvantageous to the user when the device user makes an operation error (for example, an operation of deleting data, an operation of determining input of personal information, an operation of canceling an execution process). By displaying the display target near the position 53 at the base of the finger, it is possible to suppress the occurrence of operation mistakes by forcing the device user to operate in a cramped posture.

Specifically, first, the execution program storage unit 14 in the mobile terminal device of the first embodiment stores programs of various functions (phone book, camera, music, mail, etc.). In addition, operations that want to avoid operation mistakes such as data deletion operations and execution stop operations in various functions (hereinafter referred to as error prevention targets) are initially displayed on the display unit 11 when the touch pad is not operated during execution of various functions. The arrangement information (for example, 20 pixels in the X-axis direction and 100 pixels in the Y-axis direction with the upper left corner of the display unit 11 as the base point) and the image size are stored respectively.

Here, when the touch pad 12 is operated while the display unit 11 is displaying various functions, the control unit 16 recognizes the position of the base of the finger of the device user by using the above calculation method. Then, the control unit 16 determines whether or not there is an error prevention target displayed outside the distance range from a certain distance range centered on the root position and the initial arrangement information of the error prevention target.

When there is no error prevention target outside the distance range, the control unit 16 displays an operation-free screen on the display unit 11 according to the initial arrangement information. On the other hand, when there is a mistake prevention target outside the distance range, the control unit 16 displays so that the mistake prevention target is included within a certain distance range centered on the root position. For example, a stop icon may be displayed at the base of the finger along the edge of the nearest display unit. As a result, it becomes difficult to operate the touchpad 12 unless the finger for operating the touchpad 12 is bent and touched consciously, and operation mistakes can be reduced.

In the first embodiment, the operability by the touch pad is improved by not displaying the operation target at the display portion of the display unit corresponding to the position 53 of the base of the specified finger. In the second embodiment, a configuration for improving the operability by the touch pad while displaying the operation target on the display portion of the display unit corresponding to the position 53 of the base of the specified finger will be described. FIG. 7 shows the relationship between the display example by the mobile terminal device of the second embodiment of the present invention and the root position at the time of display.

The pointers that specify the target displayed on the display include those that specify the target that includes certain position coordinates (points) (called a position specification pointer) and those that partially include a set (range) of certain position coordinates. There is something that specifies (called a range specification pointer). In the second embodiment, as shown in the middle part of FIG. 7, the position designation pointer 71 (the target including the position coordinates of the tip of the arrow is designated) and the range designation are specified according to the distance from the position 53 of the base of the specified finger. It performs switching display with the pointer 72 (specifying an object including a part of the position coordinates circled) and switching display of the range of the range designation pointer. Specifically, the control unit 16 executes the pointer display program stored in the execution program storage unit 14 to set the distance between the position coordinates input from the touch pad 12 and the position 53 at the base of the specified finger. Compare, if the distance is longer than a certain threshold, the position designation pointer 71 with the position coordinates input from the touchpad 12 as the tip of the arrow is displayed on the display unit 11, and if the distance is shorter than a certain threshold, touch. A range designation pointer 72 having a radius centered on the position coordinates input from the pad 12 and becoming longer as the distance is shorter is displayed on the display unit 11.

The lower part of FIG. 7 is a display example when a plurality of targets ( tavern and restaurant) are specified by the range designation pointer 72. After a plurality of targets are specified by the range specification pointer 72, the control unit 16 displays the targets ( tavern and restaurant) in another window 73, and accepts the key input by the operation key 13 to display the target ( tavern and restaurant). Select the target according to the key input. If the key input by the operation key 13 is not accepted, the target is specified again by the range specification pointer 72, and then the target is displayed in another window 73.

As described above, the switching display between the position designation pointer 71 and the range designation pointer 72 and the range of the range designation pointer according to the distance between the position coordinates input from the touch pad 12 and the position 53 of the specified finger base are displayed. When the tip of the finger is brought into contact with a place near the base of the finger by switching the display, the range specified by the pointer is expanded to provide an operation environment in which the target displayed on the display unit can be easily specified. be able to.

Depending on the size and shape of the mobile terminal device equipped with the touch pad, it is possible to provide a mobile terminal device with sufficiently high operability by arranging an icon that requires operation in an area other than the area that cannot be reached even if the finger is completely extended. In some cases. For example, there is a mobile terminal device in which a display surface and a transmissive touch pad, which are supposed to be operated by a thumb, are arranged so as to overlap each other on the same surface. In this embodiment, a mobile terminal device is illustrated in which an icon requiring operation is not arranged in an area that cannot be reached even if the finger is completely extended, and an icon that requires operation is arranged only in an area that can be reached by extending and contracting the finger. Hereinafter, this embodiment will be described with reference to FIGS. 10 and 11.

As shown in FIG. 10, the user continuously moves the tip of the thumb while arranging the base of the thumb at the position 53, and presses the touch pad to form a plurality of contact surfaces 51. The touch pad 12 detects the respective positions of the plurality of contact surfaces 51. The position of each of the contact surfaces 51 to be detected may be appropriately determined such as the tip, center, or end of the contact surface 51. The control unit 16 (see FIG. 1) determines a curve or a straight line connecting each of the plurality of continuously moved contact surfaces 51 at the shortest distance as the limit 1001 of the operable area. Further, the control unit 16 determines that the area close to the position 53 of the base of the thumb with respect to the limit 1001 of the operable area is the operable area 1003, and the opposite side, that is, the base of the thumb with respect to the limit 1001 of the operable area. The area far from the position 53 of is determined as the inoperable area 1002.

In the above description, the case where the user forms a plurality of contact surfaces 51 has been described, but it is not necessary to form a plurality of contact surfaces 51, and if there is at least one contact surface 51, the operation can be performed in the same manner as described above. Area limits 1001, operable area 1003, and inoperable area 1002 can be determined. Specifically, the touchpad 12 detects the position of one contact surface 51. The control unit 16 determines the limit 1001 of the arcuate operable region centered on the base position 53 of the thumb based on the position of one contact surface 51. Further, the control unit 16 determines that the region close to the position 53 of the base of the thumb is the operable region 1003 with respect to the limit 1001 of the operable region, and sets it on the opposite side, that is, the limit 1001 of the operable region. On the other hand, the area far from the position 53 at the base of the thumb is determined to be the inoperable area 1002.

For example, it is assumed that the display unit 11 initially displays a plurality of icons 1004 arranged in a matrix on the entire surface of the display unit 11 (touch pad 12) as shown in FIG. 11 (a). The control unit 16 moves the icon 1004 so that the icon 1004 is arranged only in the operable area 1003. The display unit 11 displays so that the icon 1004 is arranged only in the operable area 1003 as shown in FIG. 11B according to the instruction from the control unit 16. That is, the display unit 12 sets the limit 1001 of the operable area as the display limit, and displays so that the icon 1004 is arranged only inside the display limit. The timing at which the display unit 11 displays the icon 1004 according to the instruction from the control unit 16 may be an instruction from the user or an instruction from the control unit 16. In this embodiment, the number of operable icons 1004 is reduced, but since the icons are displayed only in the area that can be operated by a finger, it is possible to provide a mobile terminal device having sufficiently high operability.

In the embodiment of the present invention, the mobile terminal device provided with the touch pad has been described, but the same effect can be obtained even with the mobile terminal device provided with the touch panel.

According to the mobile terminal device and the display control method of the present invention, when the mobile terminal device is held with one hand and the touch panel or the touch pad is operated with the hand, the operability can be improved. It is useful in the field of mobile terminal devices equipped with touch panels and touch pads.

<figref num="1">Configuration diagram of the mobile terminal device according to the embodiment of the present invention</figref><figref num="2">Flow chart implemented by the mobile terminal device according to the embodiment of the present invention</figref><figref num="3">The figure explaining the calculation process of the long axis carried out by the mobile terminal apparatus of embodiment of this invention.</figref><figref num="4">The figure explaining the process of specifying the root position carried out by the mobile terminal apparatus of embodiment of this invention.</figref><figref num="5">Features of the finger contact surface when operating the touch panel</figref><figref num="6">Relationship between display example by mobile terminal device of Example 1 of the present invention and root position at the time of display</figref><figref num="7">Relationship between display example by mobile terminal device of Example 2 of the present invention and root position at the time of display</figref><figref num="8">Front view (a) and rear view (b) of the mobile terminal device of Patent Document 1</figref><figref num="9">Posture of fingers when operating the touch pad with the mobile terminal device of Patent Document 1.</figref><figref num="10">The figure explaining the operable area by the mobile terminal apparatus of Example 3 of this invention.</figref><figref num="11">(a) and (b) are diagrams illustrating a display example by the mobile terminal device according to the third embodiment of the present invention.</figref>

Code description

11 Display 12 touchpad 13 Operation keys 14 Execution program storage 15 Arithmetic information storage unit 16 Control unit 51, 52 contact surface 53 Position of the base of the finger 71 Positioning pointer 72 Range pointer 73 window 81 Display 82 touchpad 83 index finger 1001 Limit of operable area 1002 Inoperable area 1003 Operable area 1004 icon