JP6708402B2 - Electronic device, touch panel control method, program, and storage medium - Google Patents

Description

The present invention relates to an electronic device including a display device having a capacitive touch panel, a touch panel control method, a program that causes a computer to execute the touch panel control method, and a storage medium.

In recent years, electronic devices including a display device having a touch panel have become widespread. The operation of the touch panel has an advantage that it can be intuitively and easily performed because the input target and the operation target match. In particular, the mounting of touch panels on imaging devices such as digital cameras and display devices such as smartphones (mobile communication devices) is progressing. With these electronic devices, the user displays a shooting screen or an operation screen on the display device. The desired operation can be easily performed.

As a touch position detection method on a touch panel, a so-called electrostatic capacitance method is widely used. A capacitive touch panel is generally a column sensor (column electrode) in which a plurality of touch sensors (sensor electrodes) are connected in a column direction and a row sensor (row sensor) in which a plurality of touch sensors are connected in a row direction. And electrodes) are arranged in a grid pattern so as to be orthogonal to each other in a plane. Then, the touch position is detected by applying a pulse voltage to the column sensor or the row sensor to cause a current to flow, thereby performing a scan, and measuring the amount of current generated during the scan as a capacitance change.

Scanning methods on the touch panel include a mutual capacitance scanning method and a self-capacity scanning method. The mutual capacitance scanning method utilizes the fact that when a pulse voltage is applied to either the column sensor or the row sensor, a current flows to the other sensor via the capacitance at the intersection of the column sensor and the row sensor. Then, the other sensor performs sensing. In this way, the touch position can be detected by reading the capacitance change at the intersection of the column sensor and the row sensor. On the other hand, in the self-capacitance scan, by applying in-phase pulse voltages to both the column sensor and the row sensor in order, the current generation at the capacitance at the intersection of the column sensor and the row sensor is canceled, and the column sensor and the row sensor are canceled. The touch position is detected by reading the capacitance change one by one.

As described above, the touch panel consumes power during the scanning operation for detecting the touch operation. Therefore, in order to save power, all sensors are normally scanned, and if a touch is not detected for a predetermined time, the sensor is decimated and scanning is performed, and the sensor is scanned. A method of reducing the number has been proposed (see Patent Document 1).

JP, 2009-193484, A

However, in the technique described in Patent Document 1, there is a possibility that the touch position cannot be accurately detected when the thinning scan is performed on the screen that requires the touch position to be detected with high accuracy. is there. In addition, electronic devices equipped with a touch panel are constantly required to reduce power consumption.

It is an object of the present invention to provide an electronic device including a touch panel that enables further power saving while ensuring the required accuracy for detecting a touch position.

Electronic device according to the present invention includes a display device including a touch panel including a plurality of sensor electrodes of the capacitive type, is displayed in the first screen of the previous SL display device, in a specific area of the touch panel The number of sensor electrodes to be scanned among the plurality of sensor electrodes for detecting the touch position is set to a first number, and while the second screen is displayed on the display device, the number of sensor electrodes to be scanned is within the specific area of the touch panel. A control means for controlling the touch panel so that the number of sensor electrodes to be scanned among the plurality of sensor electrodes for detecting the touch position is set to a second number smaller than the first number, The entire specific area is a touchable area while the first screen is being displayed, and a touch item is entirely displayed while the second screen is being displayed. Is characterized by.

According to the electronic device including the touch panel according to the present invention, it is possible to realize further power saving while ensuring the necessary accuracy for detecting the touch position.

It is a block diagram showing a schematic structure of an imaging device concerning an embodiment of the present invention. It is a figure explaining schematic structure of the touch panel provided in the display device with which the imaging device of FIG. 1 is equipped. 3 is a flowchart illustrating a control method of the touch panel of FIG. 3A and 3B are diagrams illustrating an example of a shooting condition setting screen displayed on the display device of the imaging device in FIG. 1 and a positional relationship between a touch item and a touch sensor in the setting screen. It is a figure explaining another example of the setting screen displayed on the display of the imaging device of FIG. 1, and the positional relationship between the touch item and the touch sensor in the setting screen.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Here, an imaging device will be taken up as an example of the electronic apparatus according to the present invention.

FIG. 1 is a block diagram showing a schematic configuration of an image pickup apparatus 100 according to the embodiment of the present invention. The imaging device 100 is specifically a digital still camera. The image pickup apparatus 100 includes an image pickup device 101, an A/D conversion unit 102, an image processing unit 103, a memory control unit 104, a system control unit 105, a memory 106, a release switch 107, a mode switch 108, an operation unit 109, and a non-volatile memory. 110 and an external removable memory. The image pickup apparatus 100 includes a display device 112, and the display device 112 includes a liquid crystal panel display unit 113, a backlight illumination unit 114, and a touch panel unit 115.

The image sensor 101 is, for example, an image sensor such as a CCD sensor or a CMOS sensor. When light incident through a lens (not shown) is formed as an optical image on the image sensor 101, the image sensor 101 converts the optical image into an analog electric signal by photoelectric conversion, and the generated analog electric signal is A/D conversion unit 102. Output to. The analog electric signal input to the A/D conversion unit 102 is converted into a digital signal (image data) by the A/D conversion unit 102. Under the control of the memory control unit 104 and the system control unit 105, the image data generated by the A/D conversion unit 102 is temporarily stored in the memory 106.

The image processing unit 103 performs image processing such as predetermined pixel interpolation processing and color conversion processing on the image data temporarily stored in the memory 106 and the image data read from the external removable memory 111. Further, the image processing unit 103 generates image data such as an image displayed on the display device 112 from various image data stored in the memory 106. The memory control unit 104 controls data transmission/reception between the A/D conversion unit 102, the image processing unit 103, the system control unit 105, the memory 106, and the display device 112.

The system control unit 105 has an arithmetic processing unit such as a CPU, expands various programs stored in the non-volatile memory 110 into a work area of the memory 106, and uses the arithmetic area of the memory 106 to perform various arithmetic operations. By executing the above, the overall control of the image pickup apparatus 100 is performed. The memory 106 is a storage medium having a stack area for programs executed by the system control unit 105 and various parameters, a status storage area, a calculation area, a work area, an image display data area, and the like.

The release switch 107 has a switch SW1 which is turned on by half-pressing and a switch SW2 which is turned on by fully pressing. When the switch SW1 is turned on, the system control unit 105 sets the exposure condition for photographing and performs the focusing operation on the subject. When the switch SW2 is turned on, a series of shooting processes from exposure to the image sensor 101 to generation of image data, image processing, and storage in the external removable memory 111 are performed.

The mode switch 108 switches the operation mode of the imaging device 100. The operation modes include a still image shooting mode, a moving image shooting mode, and a playback mode. The still image shooting mode includes an auto shooting mode, a manual mode, various scene modes for each shooting scene, a program AE mode, a live view mode for displaying a subject image on the display device 112 in real time, and the like. The operation unit 109 is a button or lever for inputting various operation instructions to the system control unit 105.

The touch panel unit 115 of the display device 112 can function as the mode changeover switch 108 and the operation unit 109. That is, by selecting various touch items displayed on the display device 112 by a touch operation on the touch panel unit 115, it is possible to switch the operation mode and perform various operation instructions to the system control unit 105.

The nonvolatile memory 110 is a storage medium that can be electrically erased and stored, and is, for example, a flash memory or an EEPROM. The non-volatile memory 110 stores shooting conditions, and also stores programs for controlling the imaging device 100. The external removable memory 111 is a semiconductor storage device such as a compact flash (registered trademark) for storing image data. The hardware configuration of the image pickup apparatus 100 is not limited to the above configuration.

On the liquid crystal panel display unit 113 of the display device 112, according to an instruction from the system control unit 105, a menu screen stored in the image display data area of the memory 106, a through image being photographed, and an image stored in the external removable memory 111. The image of the file is displayed. The backlight illumination unit 114 is a light source that adjusts the brightness of the screen of the liquid crystal panel display unit 113. The touch panel unit 115 is superposed on the liquid crystal panel display unit 113 and detects touch operations on various touch items displayed on the liquid crystal panel display unit 113.

FIG. 2 is a diagram illustrating a schematic configuration of the touch panel unit 115. The touch panel unit 115 includes a panel unit 200 and a touch panel driver 210, and detects a touch operation on the panel unit 200 by a capacitance method.

The panel unit 200 has a structure in which a plurality of touch sensors 220 (sensor electrodes) that generate a capacitance with an electrically conductive object such as a finger are arranged in a grid on a two-dimensional plane. The plurality of touch sensors 220 are connected in the column direction, and the plurality of column sensors 221 (column electrodes) arranged in the row direction orthogonal to the column direction, and the plurality of touch sensors 220 connected in the row direction and arranged in the column direction. It is divided into a row sensor 222 (row electrode).

The touch panel driver 210 that controls the panel unit 200 includes a touch panel control unit 211, a touch detection unit 212, and a coordinate calculation unit 213. The touch panel control unit 211 controls the column sensor 221 and the row sensor 222 to perform a self-capacitance scan or a mutual capacitance scan in order to measure the amount of change in capacitance at the touch position with respect to the touch sensor 220. .. The touch detection unit 212 determines the presence/absence of a touch operation on the panel unit 200 by comparing the amount of change in capacitance obtained by the self-capacitance scan or the mutual capacitance scan with a predetermined touch detection threshold value. The coordinate calculation unit 213 calculates the coordinates of the touch position, for example, by calculating the center of gravity based on the amount of change in the capacitance of the column sensor 221 and the row sensor 222.

In the present embodiment, when the screen displayed on the display device 112 is the second screen which has a relatively low resolution relative to the first screen which requires a high resolution for detecting the touch position, Control is performed to reduce the number of touch sensors 220 to be scanned. Hereinafter, such control will be described in detail.

FIG. 3 is a flowchart illustrating a control method of the touch panel unit 115. The processing of each step illustrated in FIG. 3 is realized by the system control unit 105 reading a predetermined program from the nonvolatile memory 110, loading the program in the memory 106, and controlling the operation of each unit included in the imaging apparatus 100. ..

In step S301, the system control unit 105 controls the touch panel driver 210 to execute the scan on the touch panel unit 115 with the number of the column sensors 221 and the row sensors 222 according to the display image displayed on the display device 112. For example, it is assumed that the image pickup apparatus 100 is set to a live view mode in which a subject image (through image, live view image) acquired by the image pickup element 101 is displayed on the display apparatus 112 in real time. In the live view mode, touch AF (autofocus) for focusing on a touch position on the touch panel unit 115 and touch release are possible, and the entire screen displayed on the display device 112 is a touchable area. In addition, it is necessary to accurately focus on a small subject, and thus it is necessary to detect the touch position with high accuracy. As described above, when the touch position is not limited and a high resolution is required for detecting the touch position, the touch panel control unit 211 performs a scan in which a pulse voltage is applied to all the column sensors 221 and the row sensors 222. , Touch position is detected. Even if the live view mode is set and the live view image is displayed, touch AF is disabled by the touch AF enable/disable setting (touch AF is set to off. In this case, high resolution is not required for detecting the touch position. In this case, it suffices to be able to determine whether or not a touch button or the like displayed by being superimposed on the live view image is touched by a relatively large touch target. Therefore, even when the live view image is displayed, when the touch AF is set to be invalid, it may be treated as the second screen. That is, like the screen for setting imaging conditions described later, the column sensors 221 and row sensors 222 to be scanned are extracted in a zigzag manner, and the number of column sensors 221 and row sensors 222 to be scanned is reduced overall. The resolution for detecting the touch position may be lowered.

In subsequent step S302, the system control unit 105 determines whether the display screen of the display device 112 has been switched by the operation of the user (photographer) of the imaging device 100. If the display screen has been switched (YES in S302), the system control unit 105 advances the process to step S303, and if the display screen has not been switched (NO in S302), it is not necessary to change the scanning method. The process is ended. Hereinafter, in the present embodiment, as an example of the case where the determination in step S302 is “YES”, setting of shooting conditions (various shooting settings) in which the live view image is not displayed from the screen on which the live view image is displayed It is assumed that the screen has been switched to the screen (contents setting screen) in which the contents are displayed.

In step S303, the system control unit 105 controls the touch panel control unit 211 to extract the column sensor 221 and the row sensor 222 to be scanned on the display screen switched in step S302. The process of step S303 will be described with reference to FIG.

FIG. 4A is a diagram showing an example of a shooting condition setting screen displayed on the display device 112 in step S302. FIG. 4B is a diagram illustrating the positional relationship between the plurality of touch items 400 shown in FIG. 4A and the column sensor 221 and the row sensor 222. In FIGS. 4A and 4B, each of the blocks surrounded by the broken line is the touch item 400.

On the shooting condition setting screen of FIG. 4A, a plurality of touch items 400 are arranged and displayed on the entire screen of the display device 112. In addition, each touch item 400 is larger than one touch sensor 220 and is mounted on the plurality of touch sensors 220. In the case of such a screen, the range in which the touch operation is possible covers the entire screen, but high accuracy is not required for detecting the touch position. Therefore, for example, the touch panel control unit 211 extracts the column sensor 221 and the row sensor 222 to be scanned in a zigzag manner, and reduces the number of the column sensor 221 and the row sensor 222 to be scanned as a whole to reduce the touch position. Decrease the resolution to detect.

Then, in subsequent step S304, the system control unit 105 controls the touch panel control unit 211 to scan only the column sensor 221 and the row sensor 222 extracted as the scan target in step S303. For example, when the column sensor 221 and the row sensor 222 are thinned in a zigzag manner to perform scanning, the touch panel control unit 211 changes the line to which the pulse voltage is applied to the column sensor 221 and the row sensor 222 for each frame. That is, the pulse voltage is applied to the odd line X(2n−1) of the column sensor 221 and the odd line (2n−1) of the row sensor 222, and the even line X(2n) of the column sensor 221 and the even line of the row sensor 222. The application of the pulse voltage to (2n) is alternately performed for each frame. Note that “n” is a natural number.

Specifically, in the first frame of FIG. 4B, the pulse voltage α is applied to the odd lines X1, X3,..., X13 of the column sensor 221 and the odd lines Y1, Y3,..., Y9 of the row sensor 222, The amount of current flowing through the line to which the pulse voltage α is applied is measured as the amount of change in capacitance. In the second frame, the pulse voltage β is applied to the even lines X2, X4,..., X12 of the column sensor 221 and the even lines Y2, Y4,..., Y8 of the row sensor 222, and flows to the line to which the pulse voltage β is applied. The amount of current is measured as the amount of change in capacitance. Thus, when viewed in units of two frames, scanning is performed in a staggered form. This processing ends with step S304.

Note that the flowchart in FIG. 3 shows one switching of the display screen. Therefore, when the determination in step S302 is NO and after the processing in step S304, this processing is terminated. On the other hand, in an actual shooting site, the display screen of the display device 112 is often switched again for shooting after the processing of step S304. Therefore, the flow of FIG. 3 returns to step S302 after step S304, returns to step S301 when the determination in step S302 is NO, and, for example, the process is repeated until the power of the imaging device 100 is turned off. Can be Thus, for example, when the display screen displayed on the display device 112 is switched from the shooting condition setting screen to the screen displaying the live view image, the touch panel control unit 211 causes all the column sensors 221 and rows to be displayed. A scan will be performed on the sensor 222.

As described above, in the present embodiment, the scanning method of the column sensor 221 and the row sensor 222 is switched for each display screen displayed on the display device 112 according to the resolution required to detect the touch position. As a result, it is possible to save power while ensuring the accuracy required for detecting the touch position.

In this embodiment, the display screen of the live view image is taken as an example of the first screen in which it is desirable to scan all the touch sensors 220 because high resolution is required for detecting the touch position. However, the first screen is not limited to this, and it is desirable to scan all the touch sensors 220 on a screen that requires a precise touch operation. For example, as the first screen, a touch drawing that draws on the locus of the touch position, such as a screen in which the touch item of the smallest size is smaller than a predetermined size among the plurality of touch items displayed, handwritten characters, handwritten illustrations, etc. Examples include a screen, a screen for touching a moving touch target, and the like. As a touch item having a minimum size smaller than a predetermined size, a touch item having a size equal to or smaller than the size of one touch sensor 220 may be mentioned. On the touch drawing screen, the thickness of the object to be drawn with respect to the locus of the touch position (so-called pen thickness setting) is treated as the first screen only if it is thinner than a predetermined size. The pulse voltage may be applied to the touch sensor 220. When the pen is thicker than a predetermined size, problems such as blurring are unlikely to occur, and high resolution is not required. Therefore, it is possible to thin out the scan target line from the column sensor 221 and the row sensor 222. Treat as a screen.

On the other hand, a high resolution is not required for detecting the touched position, and the shooting condition setting screen is taken as an example of the second screen on which the lines to be scanned can be thinned out from the column sensor 221 and the row sensor 222. However, the second screen is not limited to this, and may be a screen that does not require a precise touch operation (can be operated by a rough touch operation). For example, the second screen may be a screen in which the minimum size display item of a plurality of touchable touch items is a predetermined size or more.

Next, another example of the second screen capable of thinning out scan target lines from the column sensor 221 and the row sensor 222 will be described with reference to FIG. FIG. 5A is a diagram showing a menu screen as another example of the second screen displayed on the display device 112 in step S302. The menu screen is a screen for performing various settings and functions of the image capturing apparatus 100, and when any one of the plurality of menu items displayed on the menu screen is selected by touch, the menu screen is related to the selected menu item. The setting is changed or the function is executed. On the menu screen, horizontally long menu items are displayed side by side in the vertical direction (row direction). Further, FIG. 5B is a diagram illustrating a positional relationship between the plurality of touch items 500 (display areas of menu items) shown in FIG. 5A and the column sensor 221 and the row sensor 222. In FIGS. 5A and 5B, each of the blocks surrounded by broken lines is the touch item 500.

Since the touch item 500 has a horizontally long shape (substantially parallel to the row sensor 222), it has only one line width of the row sensor 222 in the vertical direction (direction substantially parallel to the column sensor 221). In the horizontal direction, it has a width corresponding to a plurality of lines of the column sensor 221. In this case, in the vertical direction, high resolution is required in order to improve the touch position detection accuracy, but high resolution is not required for the touch position detection accuracy in the horizontal direction (direction substantially parallel to the row sensor 222). is there. Therefore, the row sensor 222 is scanned without thinning out, and only the column sensor 221 is thinned out. As a result, it is possible to reduce power consumption while ensuring the required accuracy for detecting the touch position.

Specifically, the pulse voltage is not applied to the odd lines X1, X3,..., X13 of the column sensor 221, but the pulse voltage is applied only to the even lines X2, X4,. The amount of change in electrostatic capacitance is measured by detecting the amount of current flowing through. As described above, when the touch item 500 has a shape that is longer in the row direction that is longer than the predetermined aspect ratio, the power consumption can be reduced by reducing the number of column sensors 221 that apply a pulse voltage for scanning. it can. Similarly, when the touch item 500 has a shape that is longer in a column direction that is longer than a predetermined aspect ratio, the number of row sensors 222 that apply a pulse voltage for scanning is reduced to detect a touch position. It is possible to save power while ensuring the required accuracy of.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist thereof. For example, in the display image of FIG. 4A, the touch item 400 does not exist on the line Y9 of the row sensor 222. In this case, the pulse voltage may not be applied to the line Y9 of the row sensor 222, which makes it possible to further reduce the power consumption. Similarly, in the display image of FIG. 5A, there is no touch item 500 on the lines Y1 to Y4 and Y9 of the row sensor 222 and the lines X1 to X6 of the column sensor 221. In this case, the pulse voltage may not be applied to the lines Y1 to Y4 and Y9 of the row sensor 222 and the lines X1 to X6 of the column sensor 221. This makes it possible to further reduce power consumption. .. Further, regarding the display image of FIG. 5A, the embodiment has been described in which the column sensor 221 is thinned out for each line and scanning is performed. However, the present invention is not limited to this, and as long as the required touch position detection accuracy is obtained according to the length of the touch item 500 in the row direction, for example, scanning may be performed by thinning out two lines.

Further, in the above embodiment, the image pickup apparatus 100 is described as a digital still camera, but the image pickup apparatus 100 may be a digital video camera. Further, in the above embodiment, the imaging device 100 is taken up as the electronic device according to the present invention, but the present invention is not limited to this, and is applied to various electronic devices including a display device having a touch panel. be able to. For example, examples of the electronic device according to the present invention include a personal computer, a PDA, a mobile phone terminal (smartphone), a portable image viewer, a printer device including a display, a digital photo frame, a music player, a game machine, an electronic book reader, and the like. Can be mentioned.

Further, in the above-described embodiment, as the image pickup apparatus 100, which is an example of the electronic apparatus according to the present invention, one having a configuration in which one system control unit 105 controls the entire apparatus is taken up. However, the overall control of the electronic device is not limited to the configuration in which one piece of hardware performs, and the electronic device according to the present invention performs the overall control of the device by a plurality of hardware sharing the processing. May be.

The present invention supplies a program that implements one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program. It can also be realized by processing. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

100 image pickup device 101 image pickup element 105 system control unit 112 display device 115 touch panel unit 200 panel unit 210 touch panel driver 211 touch panel control unit 212 touch detection unit 213 coordinate calculation unit

Claims (17)

A display device including a touch panel having a plurality of capacitance type sensor electrodes, and the plurality of display devices for detecting a touch position in a specific area of the touch panel during display of a first screen on the display device. The number of sensor electrodes to be scanned among the sensor electrodes of 1 is set to a first number, and during the display of the second screen on the display device, the number of sensor electrodes to be detected in order to detect a touch position in the specific area of the touch panel is A control means for controlling the touch panel so that the number of sensor electrodes to be scanned among the plurality of sensor electrodes is a second number smaller than the first number;
The entire specific area is a touchable area while the first screen is being displayed, and a touch item is entirely displayed while the second screen is being displayed. An electronic device characterized by. When the second screen is the second screen, the control unit sets a sensor electrode to be scanned among the plurality of sensor electrodes to detect a touch position with respect to the specific area of the touch panel to the first screen. The electronic device according to claim 1, wherein the electronic device is thinned out more than the case. When the second screen is the second screen, the control unit sets a sensor electrode to be scanned among the plurality of sensor electrodes to detect a touch position with respect to the specific area of the touch panel to the first screen. The electronic device according to claim 1, wherein the electronic device is thinned out in a zigzag pattern as compared with the above case. 4. The electronic device according to claim 1, wherein the second screen is a screen whose detection accuracy of a touch position is relatively lower than that of the first screen. machine. The plurality of sensor electrodes are arranged in a grid on a two-dimensional plane, are connected in the column direction and are arranged in the row direction, and the plurality of column electrodes are connected in the row direction and are arranged in the column direction. The electronic device according to claim 1, wherein a plurality of row electrodes are configured. The second screen includes a long touch items than the width of one roll of the connected column electrodes in the row direction of the width of the row direction of the plurality of sensor electrodes,
The electronic device according to claim 5, wherein the control unit thins the plurality of column electrodes to scan the touch item. The second screen includes a touch item having a width in the column direction longer than a width of one row electrode connected in the row direction among the plurality of sensor electrodes,
7. The electronic device according to claim 5, wherein the control unit thins out the plurality of row electrodes and scans the touch item. The touch item displayed in the specific area during the display of the second screen has a size including at least two sensor electrodes of the plurality of sensor electrodes. The electronic device according to any one of 1. The first screen is a screen in which the smallest touch item among the one or more touch items displayed in the specific region is less than the size of one sensor electrode of the plurality of sensor electrodes, the touch. 9. The electronic device according to claim 1, wherein the electronic device is one of a touch drawing screen for performing drawing according to a position trajectory and a screen for touching a moving touch target. Of the screens for drawing according to the trajectory of the touch position, the case where the thickness of the object to be drawn for the trajectory of the touch position is smaller than a predetermined size is set as the first screen, and for the trajectory of the touch position The electronic device according to any one of claims 1 to 9, wherein a case where a thickness of an object to be drawn is set to be thicker than a predetermined size is set as the second screen. Has imaging means,
The first screen is a screen for displaying a live view image captured by the image capturing means,
The electronic device according to claim 1, wherein touch AF or touch release is possible by a touch operation on the touch panel. It is possible to set whether to enable or disable the touch AF, and when the touch AF is set to be disabled, even if the screen displaying the live view image is the second screen. The electronic device according to claim 11, which is treated as. 13. The electronic device according to claim 11, wherein the second screen is a setting screen in which the live view image is not displayed and the setting contents of a plurality of shooting settings are displayed. 14. The electronic device according to claim 11, wherein the second screen is a menu screen in which a plurality of horizontally long menu items are vertically arranged without displaying the live view image. machine. A method for controlling the touch panel in a display device including a touch panel having a plurality of sensor electrodes for detecting a touch position by a capacitance method,
While displaying the first screen on the display device, the number of sensor electrodes to be scanned among the plurality of sensor electrodes for detecting a touch position in a specific area of the touch panel is set to a first number, During the display of the second screen on the display device, the number of sensor electrodes to be scanned among the plurality of sensor electrodes for detecting the touch position in the specific area of the touch panel is set to the first number. A control step for controlling the touch panel to have a second number less than
The specific area is a touchable area entirely while the first screen is being displayed, and a touch item is entirely displayed while the second screen is being displayed. Touch panel control method. A program for causing a computer to function as each unit of the electronic device according to any one of claims 1 to 14 . Computer, storing a program for causing to function as each means of the electronic apparatus according to any one of claims 1 to 14, the computer-readable storage medium.