JP2017054396A - Information processor having a touch panel, control method of information processor, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent detection delay of coordinate representing a touch position due to noise influences.SOLUTION: The information processor detects a coordinate representing touch position made by a user on the touch panel and controls display of images based on the detected coordinate. The information processor measures the time from a detection of a coordinate to a point when the next coordinate is detected and notifies a user to prompt to connect the earth wire based on the measured time.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an information processing apparatus having a touch panel, a control method for the information processing apparatus, and a program.

  In recent years, many mobile phones, smartphones, tablets, notebook PCs, multifunction peripherals, ATMs, ticket vending machines, vending machines, and the like having a display for displaying various contents have been seen. In addition, each device is equipped with a touch panel, so that input devices such as a keyboard, a numeric keypad, and a mouse can be reduced, and at the same time, an advanced design and intuitive operability can be provided.

  The touch panel is a device that is usually provided on the display so as to be able to detect a touch position with a fingertip, a touch pen, or the like, and can change or switch screens in accordance with the touch position information. One example of realizing the detection of the touch position information is a capacitive touch panel using a capacitive sensor.

  The capacitive touch panel is configured in a matrix form of row wiring and column wiring, and a sensor (capacitance) for detecting a touch position is provided at each intersection. Since a sensing signal is input to the row wiring and the amount of charge injected into the column wiring by the sensing signal is proportional to the increase in capacitance due to the touch, the touch position can be identified.

  In general, after a drive signal having a specific frequency is input to each row wiring, the presence or absence of a touch and the touch position are identified by sensing a signal of the corresponding frequency via each column wiring. However, if there is noise in the corresponding frequency band for various reasons, it is impossible to distinguish the drive signal, and the touch position detection accuracy is lowered, for example, the touch position is erroneously detected.

  With respect to such a problem, Patent Document 1 detects the presence or absence of noise in the frequency band of the drive signal, and if noise exists, changes the frequency of the drive signal to minimize the influence of noise. Techniques to do this are disclosed. According to this technique, a dummy scan for sensing the signal of the column wiring is repeated a plurality of times without applying a drive signal to the row wiring, and the obtained signal level is evaluated to confirm the presence or absence of noise. As a result, if it is determined that noise is present, it is possible to prevent a decrease in touch position detection accuracy due to noise by applying a drive signal at a different frequency from the current frequency band.

JP2013-206463A

  If a process that always suppresses the influence of noise at the time of detecting touch coordinate data as in Patent Document 1 under a noise environment, detection of the target coordinate data is delayed by the processing time. As a result, there is a problem that the scroll (slide) of the screen particularly during the drag operation cannot be seen smoothly.

  The drag operation refers to an operation of moving the screen up / down / left / right following the movement of the finger by sliding the finger while touching the touch panel. Generally, in touch panel control, a drag operation is performed if the movement distance between the first touch coordinate data at the start of touch and the second touch coordinate data that has been touched and moved is greater than or equal to a predetermined value. Judge. Then, the screen is translated and displayed by the amount of change of the fingertip from the first to the second coordinates. When the third, fourth,... Coordinate data is detected in a state where the touch is still continued, the screen moved in parallel by the amount of change moved each time is displayed. Therefore, in touch panel control in which a drag operation is possible, it is desirable to shorten the coordinate data detection time interval and shorten the distance between the detected coordinates so that the scroll of the screen looks smooth.

  However, if the touch coordinate data detection is delayed by performing the noise suppression process as in Patent Document 1, the time interval of the detected coordinates is widened during the drag operation. For this reason, the screen is displayed in a skipped manner, and it becomes impossible to display it by scrolling smoothly. In particular, the faster the finger of the drag operation, the more pronounced the effect.

  An object of the present invention is to suppress delay in detection of coordinates indicating a touch position due to the influence of noise.

The present invention is an information processing apparatus having a touch panel,
Detecting means for detecting coordinates indicating a touch position by a user on the touch panel;
Display control means for controlling display of an image based on the coordinates detected by the detection means;
Measuring means for measuring the time from detection of coordinates by the detection means until detection of the next coordinates;
Based on the time measured by the measuring means, a notification means for notifying the user to connect the ground wire;
It is characterized by having.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the detection of the coordinate which shows a touch position is delayed by the influence of noise.

Block diagram of the image forming apparatus 100 Block diagram of the operation unit 12 Example of appearance of operation unit 12 The figure which shows the mechanism of the touch position detection of the touchscreen 405. The figure which shows the example of the scroll display of the image by drag operation to the touch panel 405 The figure which shows the example of the scroll display of an image when touch position information is detected with a delay The figure which shows an example of the display which accelerates | stimulates the connection of the earth wire 17 Flow chart showing processing of CPU 401 Flow chart showing processing of CPU 402 The figure which shows the example of the display image which can apply this invention

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a hardware block diagram of an image forming apparatus 100 equipped with touch panel control according to the present invention. As shown in FIG. 1, the image forming apparatus 100 includes a controller 11 that controls the operation of the image forming apparatus 100, an operation unit 12, a scanner unit 13, a printer unit 14, a power supply unit 15, a power outlet 16, and a ground wire 17. I have.

  The controller 11 is communicably connected to the operation unit 12, the scanner unit 13, and the printer unit 14. The controller 11 includes a CPU 301, a RAM 302, a ROM 303, a power supply control unit 304, an input / output I / F 305, and a LAN controller 306. The CPU 301, RAM 302, ROM 303, power supply control unit 304, input / output I / F 305, and LAN controller 306 are connected to the system bus 307. The controller 11 also includes an HDD 308, an image processing unit 309, a scanner I / F 310, and a printer I / F 311. The HDD 308, the image processing unit 309, the scanner I / F 310, and the printer I / F 311 are connected to the image bus 312.

  The CPU 301 is a processor that controls the overall operation of the image forming apparatus 100. The CPU 301 comprehensively controls access to various connected devices based on a control program or the like stored in the ROM 303 and also comprehensively controls various processes executed by the controller 11. A RAM 302 is a system work memory for the CPU 301 to operate. The RAM 302 is also a memory for temporarily storing image data. The ROM 303 stores a boot program for the apparatus.

  A power control unit 304 controls power supply to each unit of the image forming apparatus 100. The input / output I / F 305 is an interface unit that exchanges information between the system bus 307 and the operation unit 12. The LAN controller 306 transmits and receives information to and from the external device 20 connected to the network 30.

  The HDD 308 is a hard disk drive and stores system software and image data. The image processing unit 309 performs image processing, reads image data stored in the RAM 302, and performs image processing such as JPEG and JBIG enlargement or reduction, and color adjustment. The scanner I / F 310 is an interface unit for communicating with the scanner control unit 331 of the scanner unit 13. The printer I / F 311 is an interface unit for communicating with the printer control unit 341 of the printer unit 14. The image bus 312 is a transmission path for exchanging image data, and includes a PCI bus, an IEEE 1394 bus, or the like.

  The scanner unit 13 optically reads an image on a document and generates image data. The scanner unit 13 includes a scanner control unit 331 and a scanner driving unit 332. The scanner driving unit 332 includes a driving unit for moving a reading head that reads an original, a driving unit for conveying the original to a reading position, and the like. The scanner control unit 331 controls the operation of the scanner driving unit 332. The scanner control unit 331 receives setting information set by the user when performing the scanner processing through communication with the CPU 301, and controls the operation of the scanner driving unit 332 based on the setting information.

  The printer unit 14 forms an image on a recording medium (on paper) according to an electrophotographic method. The printer unit 14 includes a printer control unit 341 and a printer driving unit 342. The printer driving unit 342 includes a motor that rotates a photosensitive drum (not shown), a mechanism unit that pressurizes the fixing device, a heater, and the like. The printer control unit 341 controls the operation of the printer driving unit 342. The printer control unit 341 receives setting information set by the user when performing print processing through communication with the CPU 301, and controls the operation of the printer driving unit 342 based on the setting information.

  The power supply unit 15 receives supply of power from the commercial AC power supply 40, converts it to direct current, steps down the voltage, and supplies it to the image forming apparatus 100. The power supply control unit 304 performs power supply timing and ON / OFF control.

  By connecting the ground wire 17 to a ground terminal of a commercial AC power source (not shown), it is possible to match the reference of the potential of the housing of the image forming apparatus 100 and the commercial AC power source, thereby preventing electric leakage to humans. it can. Also, it plays a role of releasing noise mixed from the commercial AC power supply 40 and noise current generated in the image forming apparatus 100. Even if the ground wire 17 is not connected to the ground terminal, the image forming apparatus 100 can operate.

  FIG. 2 is a block diagram of the operation unit 12 for realizing the touch panel control according to the present invention. As illustrated in FIG. 2, the operation unit 12 includes a CPU 401, an LED 402, a hard key 403, a touch panel control unit 404, a touch panel 405, an LCD 406, a backlight 407 of the LCD 406, a voice synthesis unit 408, and a speaker 409.

  The CPU 401 is a processor that comprehensively controls the operation of the entire operation unit 12. Based on an instruction from the CPU 301 of the CPU 401 controller 11, the lighting / extinguishing control of the LED 402, the sound output control to the speaker 409, the backlight lighting / extinguishing control of the LCD 406, and the like are performed. Further, the CPU 401 notifies the CPU 301 of detection information of pressing of the hard key 403, touch position information of the touch panel 405 via the touch panel control unit 404, and the like.

  The LED 402 includes, for the image forming apparatus 100, a power LED indicating that the main power is turned on, an error LED indicating that an error has occurred, an executing LED indicating that processing is being performed, and the like.

  The hard key 403 is provided with a numeric keypad for inputting a value number, a telephone number, and the like, and a sleep key for shifting to the power saving mode. In addition, the hard key 403 is used. A start key for instructing the start of copying or scanning, a stop key for stopping processing, a setting key for shifting to various setting screens, and the like are provided.

  When the touch panel control unit 404 detects a touch on the touch panel 405 with an instruction input body such as a finger or a pen, the touch panel control unit 404 acquires touch identification information indicating touch content together with coordinate data indicating the touch position, and notifies the CPU 401 of the touch identification information. . The touch identification information includes touch start (touch down), touch ongoing (move), and touch end (touch up). “Touch start” is detected when the input indicator touches the touch panel 405, and “while touching” is detected when the input indicator remains in contact with the touch panel 405. “End of touch” is detected when the input indicator touching the touch panel 405 leaves. The touch panel 405 is a capacitive touch panel.

  The LCD 406 outputs the image data transmitted from the controller 11 to the liquid crystal screen. At this time, since the display cannot be made unless the backlight 407 is turned on, the controller 11 performs control to turn on the backlight after the screen is displayed.

  The voice synthesizer 408 has various timbre data, and outputs designated timbre data to the speaker 409 under the control of the CPU 401 in response to an instruction from the controller 11 to output a voice. Examples of the sound include a touch sound of the touch panel 405, a warning sound when an error occurs in the image forming apparatus 100, and an end sound when copying is completed.

FIG. 3 is an example showing the appearance of the operation unit 12.
A hard key 403 is disposed on the right side and an LED 402 is disposed on the lower side as viewed from the user using the operation unit 12. The touch panel 405 is placed over the LCD 406. By touching the touch panel 405, the screen displayed on the LCD 406 can be intuitively operated.

  FIG. 4 is a diagram illustrating a mechanism for detecting a touch position (coordinate data) on the touch panel 405. The touch panel 405 is divided into n at equal intervals in the horizontal direction (x axis) and m at equal intervals in the vertical direction (y axis). The touch panel control unit 404 monitors the presence or absence of a touch, and acquires specific coordinate data when a touch is detected. FIG. 4 shows a case where P (x3, y2) is detected as coordinate data, and the touch panel control unit 404 notifies the CPU 401 of the acquired coordinate data. In addition, the touch panel control unit 404 notifies the CPU 401 of touch identification information of touch start, touch continuing, or touch end together with the coordinate data.

  Furthermore, the touch panel control unit 404 performs processing for suppressing noise received from the outside for each touch detection (hereinafter referred to as noise suppression processing), and the time from touch detection to touch coordinate data acquisition varies depending on the noise situation. To do. For details of the noise suppression processing, refer to Patent Document 1.

  Next, a processing operation from the operation of the touch panel 405 to the screen switching will be described based on FIGS. First, image data to be displayed on the LCD 406 is stored in the HDD 308. The CPU 301 controls the input / output I / F 305 to instruct the image data to be displayed to be read from the HDD 308 and transferred to the LCD 406 of the operation unit 12.

  On the other hand, when the touch panel 405 is touched, the touch panel control unit 404 detects the coordinate data, and the CPU 401 acquires it and transfers it to the controller 11 as input data. The CPU 301 of the controller 11 reads the acquired coordinate data and determines whether it is necessary to switch the image data to be displayed on the LCD 406 (for example, pressing the switch area or sliding the screen). If it is determined that it is necessary, the CPU 301 controls the input / output I / F 305 to read out desired display image data from the HDD 308 and transfers it to the LCD 406.

  FIG. 5 is a diagram illustrating a case where the display screen on the LCD 406 is scrolled in the horizontal direction (x-axis direction) by a drag operation on the touch panel 405. As described above, the drag operation is an operation of moving the screen following the movement of the finger by sliding the finger while touching the touch panel. FIG. 5 shows an example in which an image indicated by “A” is initially displayed on the entire screen of the LCD 406, and a drag operation to the left is performed toward the screen. As a result, the image “A” is gradually hidden, the image “B” that is not initially displayed is gradually displayed, and the display image is scroll-displayed in the left direction.

  FIG. 5A shows a case where touch on the touch panel 405 is started (finger is touched) and coordinate data of P0 (x0, y0) is detected as the touch position.

  FIG. 5B shows a case where a drag operation for sliding without touching the finger is performed after touching the position P0 on the touch panel 405, and the detected coordinate data is P1 (x1, y1). Is shown. At this time, the detected coordinate data P1 (x1, y1) is transmitted from the CPU 401 to the CPU 301. The CPU 301 calculates the movement amount of P0 → P1, and controls to hide a part of the “A” image and display a part of the “B” image according to the movement amount and the movement direction.

  5C and 5D show a case where coordinate data is detected in the order of P0 → P1 → P2 → P3 as a result of continuing the drag operation. The CPU 301 calculates the movement amount based on the coordinate data notified from the CPU 401, and hides the “A” image little by little according to the movement amount and the movement direction, and the “B” image little by little. It shows how it is displayed.

  Since the screen display control is performed in this way for the drag operation, the screen “A” becomes the screen “B” as the time interval from the acquisition of the coordinate data to the acquisition of the next coordinate data is shorter. Looks like it is scrolling smoothly.

  FIG. 6 is a diagram illustrating a case where the same drag operation as that in FIG. 5 is performed on the touch panel 405, but the detection of coordinate data is delayed as compared with FIG. 5 due to the influence of the noise suppression process.

  FIG. 6A shows a case where touch on the touch panel 405 is started and coordinate data of P0 (x0, y0) is detected as the touch position.

  FIG. 6B shows a situation in which the screen display does not switch from FIG. 6-1 because the drag operation is performed after touching P0 but the coordinate data is not detected due to the influence of the noise suppression processing. .

  FIG. 6C shows a situation in which the finger is slid further than in FIG. 6B, but the screen display is not switched because the coordinate data is not detected yet.

  FIG. 6D shows a state in which the coordinate data P1 (x1, y1) is finally detected by continuing the drag operation, and the display screen is switched in accordance with the amount of change in the coordinates of P0 → P1. In FIG. 6, although the drag operation similar to that in FIG. 5 is performed, the time interval from the first detection of the coordinate P0 to the next detection of the coordinate P1 is long. The screen is suddenly switched from the display state shown in a) to the display state shown in FIG. In this way, the longer the detection time interval of the coordinate data that is detected sequentially, the larger the screen will be switched after the time is available, so the smooth scrolling feeling is lost, and the scroll display with a loose operability is displayed. turn into. The effect of this increases as the finger slide speed during the drag operation increases. Therefore, a method for preventing the scroll display from becoming unsmooth as long as the coordinate data detection time interval becomes long will be described below.

  FIG. 7 is a diagram showing an example of a screen displayed on the LCD 406 when the coordinate data detection time interval of P0 → P1 in FIG. 6 is a predetermined time or more.

  As described above, by connecting the ground wire 17 to the ground terminal, noise mixed from the commercial AC power supply 40 and noise generated in the image forming apparatus 100 can be released to the ground. Therefore, in order to reduce the influence of noise on the touch panel control unit 404, it is desirable to connect a ground wire. In particular, when the touch panel control unit 404 performs noise suppression processing, it is possible to reduce the load on the processing and to prevent the delay of coordinate data detection as much as possible. On the other hand, it is difficult to electrically confirm whether or not the ground wire 17 is connected to the ground terminal. Therefore, in this embodiment, when it is detected that the detection of the coordinate data is delayed, the display of prompting the connection of the ground wire 17 as shown in FIG. 7 is displayed to the user of the image forming apparatus 100. Expect to have a connection.

  In the example of FIG. 7, the display window does not disappear unless the user prompts the connection of the ground wire 17 and presses the “OK” button. When the “OK” button is pressed, the display of FIG. 7 is not displayed even if it is detected that the coordinate data detection time interval is late for a predetermined period. This is to avoid hindering the operation due to the display of FIG. 7 being displayed each time the drag operation is performed if the ground wire 17 is not immediately connected. For this reason, the predetermined period may be, for example, 24 hours, and a method of calling up the connection of the ground wire once a day is conceivable. An arbitrary value may be set by the user for the predetermined period, or the user may be able to select from a plurality of candidates (for example, one week, 24 hours, 12 hours, etc.).

FIG. 8 is a flowchart showing the processing of the CPU 401 in this embodiment.
The CPU 401 determines whether or not a drag operation has been performed based on the touch position information and touch identification information notified from the touch panel control unit 404 (S801). For example, the touch panel control unit 404 notifies the coordinate data together with the “touch start” information, and then notifies the coordinate data together with the “touch ongoing” information, and the change amount of the coordinate data of these two points is a predetermined value or more. If there is, it is determined as a drag operation. Similarly, two points of coordinate data are notified together with the “touch ongoing” information, and if the amount of change in the coordinate data of these two points is equal to or greater than a predetermined value, it is determined that the operation is a drag operation. If it is not determined that the drag operation has been performed by the CPU 401 and it is determined that the touch is ended (Yes in S808), the control flow is ended. For example, when an operation of pressing a button displayed on the LCD 406 and releasing the finger immediately is performed, first, coordinate data indicating the button position is notified together with information of “touch start”, and subsequently “touch end”. Will be notified. In this case, since the drag operation has not been performed, the process ends. Note that the CPU 401 transfers the detected coordinate data and touch identification information to the controller 11 each time coordinate data is detected. The CPU 301 of the controller 11 controls the display of an image on the LCD 406 based on the coordinate data received from the CPU 401 and the touch identification information. The CPU 401 always measures the time interval from when the coordinate data is detected until the next coordinate data is detected. The CPU 401 waits until a drag operation is performed (S801) or until the touch ends (S808).

  If it is determined in S801 that the drag operation has been performed, the CPU 401 determines whether or not the detected time interval t between the two latest measured coordinates exceeds a predetermined time Tth (S802). If not exceeded, the coordinate data detection of the touch panel control unit 404 is not delayed by the noise suppression process, and is regarded as having no influence on the drag operation, and the process returns to S801. If it exceeds, there is a possibility that the detection of the coordinate data is delayed due to the influence of noise, so the process proceeds to S803 and subsequent steps to prompt the user to connect the ground wire.

  Here, an example of a set value of Tth will be described. The purpose of this embodiment is to prevent noise from being mixed by connecting the ground wire 17 and not to impair the operability of the touch panel 405. For this reason, it is desirable that the average value of the coordinate detection time intervals when no noise is mixed be Tth so that it can be more accurately determined that the noise is mixed. As described above, in a capacitive touch panel, a drive signal having a specific frequency is input to the row wiring, and then the presence / absence of touch and the touch position are detected by sensing the signal of the frequency via each column wiring. Identify When performing noise suppression processing, first, the presence or absence of noise in the frequency band of the drive signal is determined. If it is determined that noise exists, the frequency of the drive signal is changed and the presence or absence of noise is determined again. In this way, the drive frequency is changed until it is determined that there is no noise, and coordinate data indicating the touch position is acquired at the drive frequency determined that there is no noise. Therefore, while it takes time to determine this drive frequency in an environment where noise is mixed, since the drive frequency is not changed in an environment where noise is not mixed, the detection time interval of coordinate data is almost constant. Become. Thus, for example, a method is conceivable in which coordinate data is detected a plurality of times in a state where the ground wire is connected, and the average value of the detection time intervals is set to Tth.

  Further, a frame interval that is an update time interval when the controller 11 updates the display image on the LCD 406 may be Tth. If the touch coordinate detection time interval exceeds the frame interval, the screen does not change in the next frame, and the screen changes in the subsequent frames, so that the smoothness in scroll display is lost. Therefore, if the coordinate data detection time interval exceeds the frame interval, there is a possibility that noise is mixed in, so that a display prompting the connection of the ground wire is performed in order to eliminate the influence of the noise.

  In step S803, the CPU 401 determines whether a non-display flag, which will be described later, is ON. If it is ON, the control flow ends. When the non-display flag is OFF, the display showing the connection of the ground wire shown in FIG. 7 is performed on the LCD 406 (S804).

  Subsequently, the CPU 401 waits until the touch area on the touch panel 405 of the “OK” button displayed on the LCD 406 is touched as shown in FIG. 7 (S805).

  When the “OK” button is pressed, the CPU 401 turns on the non-display flag and hides the screen of FIG. 7 (S806). As described above, this non-display flag is an obstacle to the operation by displaying the display of FIG. 7 every time a drag operation is performed when the ground wire 17 is not connected immediately after the “OK” button is pressed. In order to avoid this, it is a flag indicating that it is a period during which no display is given.

  Further, the CPU 401 sets a timer for measuring a period during which the non-display flag is valid (S807), and ends the control flow.

  FIG. 9 is a flowchart showing processing for turning off the non-display flag that the CPU 401 turned on in S806 of FIG. This process is executed in parallel with the process of FIG.

  The CPU 401 determines whether or not the non-display period timer set in S807 of FIG. 8 has exceeded a predetermined value (for example, 24 hours) (S901). If not exceeded, this flowchart is terminated.

  If the non-display period timer exceeds the predetermined value, the CPU 401 turns OFF the non-display flag that was turned ON in S806 in FIG. 8 and ends this flowchart (S902).

  As described above, according to the present embodiment, when the detection of the coordinate data is delayed, a display prompting the user to connect the ground wire is performed. When the user who sees the display performs the connection of the ground wire, the noise can be released to the ground. As a result, the touch panel control unit 404 reduces the time required for the noise suppression process, and can suppress the detection delay of the touch coordinate data as much as possible. Therefore, it is possible to smoothly scroll and display the screen during the drag operation.

  In addition, after the display prompting the connection of the ground wire is performed, when the user receives an instruction (OK button) for ending the display, the non-display flag is turned ON. Thereby, even if the detection of the coordinate data is later delayed, the display is not performed until the non-display period timer has passed a predetermined value. Therefore, when the ground wire 17 is not immediately connected, it is possible to suppress the hindrance to the operation due to the display of FIG. Further, when the non-display period timer reaches a predetermined value, the non-display flag is turned ON, and when the detection of the coordinate data is subsequently delayed, the screen of FIG. 7 is displayed again. Accordingly, even if the user forgets to connect the ground wire while pressing the “OK” button, it is possible to prompt the user to connect the ground wire again by performing the display of FIG. 7 again after a certain period of time. Become.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. For example, in the above description, when the detection of the coordinate data is delayed, the screen as shown in FIG. 7 is displayed to prompt the user to connect the ground wire, but the fact may be notified by voice. The display and the voice notification may be combined.

  Further, although it has been described in S801 in FIG. 8 that it is determined that the drag operation has been performed based on the change amount of the coordinate data of the two points detected immediately before, the coordinates of the previous three points or more are determined. You may make it determine based on data.

  Further, in S802, it has been described that it is determined whether or not the detection time interval t of the two latest coordinates exceeds Tth. This method may be used. For example, an average value of detection time intervals of the latest three or more coordinates may be calculated, and it may be determined whether or not the average value exceeds Tth. 5 and FIG. 6, the example in which the entire screen of the LCD 406 is scroll-displayed has been described. However, the present invention can also be applied to the case where only the content displayed in a part of the display area of the LCD 406 is scroll-displayed. Applicable. For example, when image data generated by scanning a document composed of a plurality of pages by the scanner unit 13 is previewed for each page in a predetermined display area, and switching to display of an image on another page is performed by a drag operation (FIG. 10). (A)) is also applicable.

  Moreover, although the example in which the content is scrolled in the left-right direction has been described with reference to FIGS. 5 and 6, the present invention can also be applied to the case where the content is scrolled in the up-down direction or the diagonal direction. For example, the present invention can also be applied to a case where an address book or a list of print jobs is displayed in a predetermined display area, and these lists are scrolled up and down by a drag operation (FIG. 10B). The present invention can also be applied to a case where a part of a preview image is enlarged and displayed in a scrolling manner in an up / down / left / right oblique direction by a drag operation in order to change a display position. Further, in the above description, an example of preventing the coordinate detection delay when the drag operation is performed has been described. However, when the coordinate detection is delayed regardless of whether the drag operation is performed, the ground wire Notification that prompts connection may be performed. That is, the process of S801 in FIG. 8 may be omitted.

  In the above embodiment, an image forming apparatus having a plurality of functions such as a copy function and a scanner function has been described as an example. However, the present invention can also be applied to an image processing apparatus having only some of these functions. Further, the present invention may be applied to other information processing apparatuses such as a personal computer, a PDA, a mobile phone, a FAX, a camera, a video camera, and other image viewers.

  As described above, the information processing apparatus according to the present embodiment can detect coordinates indicating a touch position by the user on the touch panel and can control display of an image based on the detected coordinates. Further, the information processing apparatus measures a detection time interval of a plurality of coordinates that are sequentially detected, and when the measured detection time interval exceeds a predetermined time, a notification that prompts the user to connect the ground wire. Do. As a result, the user who has received the notification connects the ground wire, so that it is possible to suppress a delay in detecting coordinates due to the influence of noise.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. Moreover, you may combine suitably a part of above-mentioned embodiment.

  And this invention is implement | achieved also by performing the following processes. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, etc.) of the system or apparatus reads the program code. It is a process to be executed. In this case, the program and the storage medium storing the program constitute the present invention.

Claims (13)

An information processing apparatus having a touch panel,
Detecting means for detecting coordinates indicating a touch position by a user on the touch panel;
Display control means for controlling display of an image based on the coordinates detected by the detection means;
Measuring means for measuring the time from detection of coordinates by the detection means until detection of the next coordinates;
Based on the time measured by the measuring means, a notification means for notifying the user to connect the ground wire;
An information processing apparatus comprising: The display control means is capable of scrolling an image displayed in a predetermined display area based on a change amount between at least two coordinates detected by the detection means,
The information processing apparatus according to claim 1, wherein the notification unit performs the notification when the display control unit performs scroll display of the image displayed in the predetermined display area.   The information processing apparatus according to claim 1, wherein the notification unit performs the notification when a time measured by the measurement unit exceeds a predetermined time.   The information processing apparatus according to claim 3, wherein the predetermined time is an average value of detection time intervals of coordinates detected by the detection unit in an environment in which noise is not mixed.   The information processing apparatus according to claim 3, wherein the predetermined time is a frame interval when the display image is updated by the display control unit.   6. The information processing apparatus according to claim 1, wherein the notification unit displays a screen that prompts connection of a ground wire. Receiving means for receiving an instruction from the user to hide the screen prompting connection of the ground wire displayed by the notification means;
The information processing apparatus according to claim 6, wherein the notification unit hides a screen that prompts connection of a ground wire for a predetermined period in accordance with reception of a user instruction by the reception unit.   The information processing apparatus according to claim 7, wherein a user can set the predetermined period. First control means for controlling the operation of the information processing apparatus;
Second control means for controlling the operation of the operation unit including the touch panel,
The second control means notifies the coordinates detected by the detection means to the first control means;
The said 1st control means performs display control by the said display control means based on the said coordinate notified from the said 2nd control means, The any one of Claim 1 to 8 characterized by the above-mentioned. Information processing device.   The information processing apparatus according to claim 1, further comprising a reading unit that reads an image of a document and generates image data.   The information processing apparatus according to claim 1, further comprising a printing unit that prints an image on a sheet based on image data. A control method for an information processing apparatus having a touch panel,
A detection step of detecting coordinates indicating a touch position by a user on the touch panel;
A display control step for controlling display of an image based on the coordinates detected in the detection step;
A measurement step of measuring time from detection of coordinates in the detection step to detection of the next coordinate;
Based on the time measured in the measurement step, a notification step of notifying the user to connect the ground wire,
A method for controlling an information processing apparatus, comprising:   The program for operating a computer as an information processing apparatus of any one of Claim 1 to 11.

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