JP2017045326A - Display device and control method thereof, program, and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high sensitivity, a display device for realizing high sensitivity, and a control method thereof, a program, and a storage medium without increasing noise by driving for display.SOLUTION: A display device includes: display means comprising a touch panel part having a plurality of sensor parts where a plurality of electrodes are crossed and disposed; frame rate variable control means for variably controlling an update period of a video signal displayed in display means; and detection means for driving a plurality of sensor parts in order and generating a detection signal for touch detection. As compared with the case where the update period of the video signal changed by the variable means is short, when the update period is long (S302;YES), a touch detection operation by the detection means is controlled so that the number of times of driving of the sensor parts by the detection means during a blanking period (S304)is increased.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a display device having a touch panel and a control method thereof.

  Many mobile devices such as smartphones and digital cameras are equipped with a touch panel for the convenience of intuitive operation while displaying a screen. In particular, in a capacitive touch panel, a display device called an in-cell touch panel has been proposed in which a common electrode mounted on a liquid crystal display panel is also used as an electrode for a touch sensor (Patent Document 1). The in-cell touch panel is a glass substrate for forming an electrode for a touch sensor by using one of a plurality of column electrodes or row electrodes arranged in a grid pattern on the touch panel part as a common electrode provided on the display panel part. Layers or film substrate layers can be reduced. As a result, the display device can be thinned, and the mobile device can be reduced in size and weight.

  In addition, when a pixel signal is written to a display target pixel, a capacitive touch panel may cause noise due to a writing operation to propagate to the touch panel unit, resulting in a malfunction. A transparent conductive layer (shield layer) is provided.

  However, in the in-cell touch panel disclosed in Patent Document 1, since the common electrode of the display device is also used as the electrode for the touch sensor, a shield layer cannot be provided structurally. On the other hand, in Patent Document 2, the scanning operation of the scanning line and the capacitance detection (scanning) from the readout line are performed at the timing when the pixel signal is not written to the display pixel, thereby performing the pixel signal writing operation. The malfunction of the touch panel due to the resulting noise is suppressed.

  In a capacitive touch panel, the capacitance generated varies depending on the contact area, but the variation in capacitance per electrode is very small. For this reason, normally, the generated capacitance is calculated by performing capacitance detection (sub-scan) a plurality of times per scan (one scan) of one intersection of the row electrode and the column electrode, and integrating these. Thus, by increasing the number of sub-scans per scan, higher sensitivity and higher accuracy can be expected.

JP 2009-244958 A JP 2012-212423 A

  However, in Patent Document 2 described above, since it is necessary to perform scanning at a timing when pixel signals are not written to the display pixels, the sub-scan per scan is compared with a general capacitive touch panel. The number of times decreases. When the number of sub-scans per scan decreases, the number of detection capacity integrations decreases, and it becomes difficult to improve detection sensitivity and S / N of detection signals.

  The present invention has been made in view of the above problems, and an object thereof is to realize high sensitivity and high accuracy without increasing noise due to driving for display.

  In order to solve the above-described problems and achieve the object, the display device according to the present invention includes a display unit including a touch panel having a plurality of sensor units in which a plurality of electrodes are arranged to cross each other, and the display unit. Variable means for variably controlling the update cycle of the video signal displayed on the display, detection means for sequentially generating the detection signals for touch detection by driving the plurality of sensor units, and the video signal changed by the variable means Control means for controlling the touch detection operation by the detection means so that the number of times the sensor unit is driven by the detection means during the blanking period of the video signal is increased when the update cycle is short, Have

  According to the present invention, it is possible to achieve high sensitivity and high accuracy without increasing noise due to driving for display.

1 is a block diagram illustrating a configuration of an imaging apparatus according to an embodiment. The block diagram which shows the detailed structure of the touchscreen part of this embodiment. The figure which illustrates the image used as the object of the frame rate change of this embodiment, or a non-object. 6 is a flowchart illustrating a touch detection operation according to the present embodiment. 4 is a timing chart showing a vertical synchronization signal and a horizontal synchronization signal of a video signal, a pixel signal, and a drive signal for a row electrode before the frame rate is changed according to the present embodiment. 6 is a timing chart showing a vertical synchronization signal and a horizontal synchronization signal of a video signal, a pixel signal, and a drive signal for a row electrode after the frame rate is changed according to the present embodiment.

  Hereinafter, embodiments applied to an imaging apparatus such as a single-lens reflex digital camera with interchangeable lenses having a display device mounted with a touch panel as a display device of the present invention will be described in detail with reference to the accompanying drawings. .

  <Apparatus Configuration> The configuration and functions of the digital camera of this embodiment will be described with reference to FIG.

  The digital camera 100 according to the present embodiment includes an image sensor 101 composed of a CCD, a CMOS, or the like. By pressing a release switch 107, an optical image of a subject formed through an interchangeable lens (not shown) is electrically generated. The signal is converted into a signal, and an analog image signal is read out.

  The A / D conversion unit 102 converts an analog signal output from the image sensor 101 into a digital signal. The digital signal converted by the A / D conversion unit 102 is stored in the memory 106 under the control of the memory control unit 104 and the system control unit 105.

  The image processing unit 103 performs predetermined pixel interpolation processing and color conversion processing on the data from the A / D conversion unit 102 or the data from the memory control unit 104.

  The memory control unit 104 controls data exchange among 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 includes a CPU and an MPU that control the entire digital camera 100.

  The memory 106 is a RAM, and a program stack area, a status storage area, a calculation area, a work area, and an image display data area for the system control unit 105 are secured. The system control unit 105 executes various calculation processes using the calculation area of the memory 106.

  The release switch 107, the mode change switch 108, and the operation unit 109 are composed of operation members such as various switches that accept various operations from the user, buttons, and a touch panel, and input various operation instructions to the system control unit 105.

The mode switch 108 switches the operation mode of the system control unit 105 to one of a still image shooting mode, a moving image recording mode, a reproduction mode, and the like.
The still image shooting mode includes an auto shooting mode, a manual mode, various scene modes serving as shooting settings for each shooting scene, a program AE mode, and a live view that displays image data (through image) obtained from the image sensor 101 in real time. Mode etc. are included.

  The operation unit 109 is appropriately assigned a function for each scene by selecting and operating various function icons displayed on the display device 112, and functions as various function buttons.

  The release switch 107 is turned on by a half-press (shooting preparation instruction) during operation, and generates a first shutter switch signal SW1. The system control unit 105 starts operations such as AF (autofocus) processing, AE (automatic exposure) processing, AWB (auto white balance) processing, and EF (flash pre-emission) processing in response to the first shutter switch signal SW1. The release switch 107 is turned on when the operation is completed, so-called full press (shooting instruction), and generates a second shutter switch signal SW2. In response to the second shutter switch signal SW2, the system control unit 105 starts a series of shooting processing operations from reading a signal from the image sensor 101 to writing image data in the external memory 111.

  The nonvolatile memory 110 is an electrically erasable / storable memory, and for example, a flash memory or an EEPROM is used. The non-volatile memory 110 stores a shooting state, a program for controlling the digital camera 100, and the like.

  The external memory 111 is a detachable recording medium such as a CF card or an SD card that stores image data and the like.

  The display device 112 includes a liquid crystal display panel (LCD) that displays images and various information, and includes a display panel unit 113, a backlight unit 114, and a touch panel unit 115. The display panel unit 113 displays video data such as a menu screen stored in the image display data area of the memory 106 or a still image or a moving image stored in the external memory 111 according to a control signal from the system control unit 105. The backlight unit 114 illuminates the display panel unit 113. For the touch panel unit 115, for example, a capacitive touch detection method is used. An electrostatic capacitance type touch panel is arranged in a grid pattern such that a plurality of column electrodes and row electrodes are orthogonal to the touch panel surface. Although details will be described later, in the present embodiment, the row electrode is shared with the electrode for applying the common drive signal VCOM of the display panel unit 113. Thereby, the glass substrate layer or film substrate layer for forming the electrode for touch sensors can be reduced, and the display device 112 is thinned.

  The acceleration sensor 116 detects the posture and movement of the digital camera 100 as acceleration information.

  The moving body detection unit 117 detects the movement of the subject in the imaging screen. The moving body detection unit 117 extracts, for example, a motion vector component by comparing an image of the Nth frame and an image of the (N−1) th frame that are continuously captured. By subtracting the motion vector component generated by the motion of the camera 100 detected by the acceleration sensor 116 from the extracted motion vector component, only the motion vector component of the subject can be detected. The detected motion vectors are grouped, and a set of motion vector components having a certain area or more in the imaging screen is detected as a moving object. The speed of the moving object is also calculated from the detected moving amount of the moving object and the frame rate.

  The frame rate variable control unit 118 variably controls the video update period (frame rate) of the display device 112. The frame rate variable control unit 118 changes the frequency of the vertical synchronization signal VSYNC and the horizontal synchronization signal HSYNC output to the display panel unit 113 in accordance with a control signal from the system control unit 105, thereby changing the display device 112 at a predetermined frame rate. To drive.

  <Configuration of Touch Panel Unit> Next, the detailed configuration of the touch panel unit 115 of the display device 112 of the present embodiment will be described with reference to FIG.

  The touch panel unit 115 uses a capacitive touch detection method, and is arranged in a lattice shape so that a plurality of column electrodes 214 and row electrodes 215 are orthogonal to the touch panel surface. The row electrode 215 is used as a scanning line, and the column electrode 214 is used as a readout line. The row electrode 215 is common with the electrode for applying the common drive signal VCOM of the display panel unit 113. The common drive signal VCOM determines a display voltage of each pixel together with a pixel voltage applied to a pixel electrode (not shown) of the display panel unit 113. Therefore, the row electrodes 215 are formed on a TFT (Thin Film Transistor) substrate of the display panel unit 113. On the other hand, the column electrode 214 is formed on a color filter glass substrate (not shown) of the display panel unit 113.

  FIG. 2B is an enlarged view of an intersection portion A where the column electrode 214 and the row electrode 215 of FIG. The row electrode 215 is connected to the constant current circuit 217, and the column electrode 214 is fixed to a predetermined potential. When a weak current is caused to flow by the constant current circuit 217, charges are accumulated in the mutual capacitance 216 generated between the column electrode 214 and the row electrode 215. Sub-scanning is performed by driving a plurality of times at one intersection (hereinafter referred to as one intersection) where the column electrode 214 and the row electrode 215 intersect, and accumulation is performed by these integration circuits 218 to calculate the capacitance. To do. The detection signal value of one scan per intersection is converted into a digital signal by the AD converter 219. It is possible to determine the presence or absence of a touch operation by calculating the amount of change in the detection signal value for touch detection as the amount of change in capacitance.

  The control circuit 210 incorporates a PLL (Phase Locked Loop) circuit for generating a clock signal using an external clock input or an internal oscillation circuit as a source oscillation. With the PLL circuit, it is possible to change the period of one scan or the period of one sub-scan.

  The scanning line driving circuit 211 and the detection signal processing circuit 212 are driven by a clock signal supplied from the control circuit 210. The control circuit 210 determines whether or not the detection signal value of each electrode output from the detection signal processing circuit 212 exceeds a predetermined touch detection determination threshold, and if it exceeds, sets a touch detection flag, Data is sequentially transferred to the memory 106. When scanning of one frame is completed, grouping of touch detection areas and barycentric calculation of touch positions are performed from the detection data of one frame stored in the memory 106, and the number of touch detections and touch detection coordinates are calculated.

  The scanning line driving circuit 211 sequentially selects and drives the scanning lines Y0 to Y8. A weak current is passed through the selected scanning line by the constant current circuit 217. The number of times of driving per one scanning line (number of times of sub-scanning) can be arbitrarily changed by a control signal from the system control unit 105 to the control circuit 210.

  The detection signal processing circuit 212 reads the detection signal by sequentially selecting the readout lines X0 to X12.

  <Touch Detection Operation> Next, the touch detection operation for the display device 112 of this embodiment will be described with reference to FIGS.

  3 is realized by developing a program stored in the nonvolatile memory 110 in the memory 106 and executing it by the system control unit 105.

  In S301, the system control unit 105 determines whether the touch function is on / off, and proceeds to S302 if the touch function is set to on, and increases touch sensitivity if the touch function is set to off. Since there is no need, the processing is terminated.

  In S <b> 302, the system control unit 105 determines whether the image displayed on the display device 112 is an image with little movement based on the movement and speed of the subject in the image acquired by the acceleration sensor 116 and the moving body detection unit 117. If the image has little motion, the process proceeds to S303. If not, the process proceeds to S305. The movement of the image is determined based on whether or not the speed of the moving object that is the subject in the image detected by the moving object detection unit 117 is equal to or less than a predetermined threshold value. FIG. 4A illustrates an image obtained by capturing a subject (a dog in the illustrated example) that moves fast or moves well in the live view mode. Such an image is determined not to be an image with little motion. FIG. 4B illustrates an image obtained by capturing a subject (a tree in the illustrated example) with little or slow motion in the live view mode. FIG. 4C illustrates a setting screen for various shooting conditions such as a shutter speed, an aperture, and ISO sensitivity as an image that does not move by the camera 100. Images such as FIG. 4B and FIG. 4C are determined as images with little motion.

  In S303, the system control unit 105 lowers the frame rate of the display device 112 by the variable frame rate control unit 118 in response to determining that an image with little motion is displayed in S302. Note that, when a fast moving image as shown in FIG. 4A is displayed, if the frame rate of the display device 112 is lowered, the movement is not displayed smoothly, and thus the user may feel uncomfortable visually. high. However, when displaying an image with little movement as shown in FIGS. 4B and 4C, even if the frame rate of the display device 112 is reduced, the user does not feel visually uncomfortable. .

  The frame rate variable control unit 118 changes the frame rate by lowering the frequencies of the vertical synchronization signal VSYNC and horizontal synchronization signal HSYNC output to the display panel unit 113. For example, when operating normally at a frame rate of 60 fps, it is possible to reduce the frame rate to 30 fps, which is 1/2, by reducing both the frequency of the vertical synchronization signal VSYNC and the horizontal synchronization signal HSYNC to ½. Become. In this case, the clock frequency of the image signal is not lowered.

  FIG. 5A shows the vertical synchronization signal VSYNC and horizontal synchronization signal HSYNC of the video signal output to the display panel unit 113 before the frame rate is changed, and the drive signals Y0 to Y8 for the row electrodes 215 when performing sub-scanning. ing. The row electrode 215 is driven at a timing (horizontal blanking period) in which the pixel signal is not written to the pixel electrode in synchronization with the horizontal synchronization signal HSYNC. FIG. 5B illustrates the relationship between the horizontal synchronization signal HSYNC, the pixel signal, and the drive signal for the row electrode Yi, and the drive signal Yi (i = 0 to 8) for the row electrode 215 during the horizontal blanking period. Is output. Thereby, it can suppress that the detection signal value of an electrostatic capacitance changes by the noise at the time of pixel signal writing.

  However, the horizontal blanking period is short, and only a few sub-scans can be performed for one horizontal synchronization signal HSYNC. As the number of pixels in the display panel unit 113 increases, the number of pixel signals increases, and the horizontal blanking period is further shortened. As a result, the number of sub-scans for one horizontal synchronization signal HSYNC decreases, making it difficult to increase the sensitivity and accuracy of the touch panel.

  Therefore, in the present embodiment, the sensitivity of the touch panel is increased and the accuracy is increased by increasing the number of subcans (the number of integrations in the integration circuit 218) by decreasing the frame rate of the display device 112 and increasing the horizontal blanking period. Is realized.

  Returning to FIG. 3, in S304, the system control unit 105 increases the number of sub-scans per horizontal synchronization signal HSYNC.

  FIG. 6A shows the vertical synchronization signal VSYNC and horizontal synchronization signal HSYNC of the video signal output to the display panel unit 113 when the frame rate and the number of sub-scans are changed, and the row electrodes 215 when performing the sub-scan. Drive signals Y0 to Y8 are shown. In FIG. 6A, the period of one vertical synchronization signal VSYNC and one horizontal synchronization signal HSYNC becomes longer than before the change of the frame rate and the number of sub-scans in FIG. 5A, and the one horizontal synchronization signal HSYNC is changed. The number of sub-scans in the horizontal blanking period has increased. FIG. 6B illustrates the relationship between the horizontal synchronization signal HSYNC after changing the frame rate and the number of sub-scans, the pixel signal, and the drive signal for the row electrode Yi. When the frame rate is changed in S303, only the frequency of the vertical synchronization signal VSYNC and the horizontal synchronization signal HSYNC is changed, and the clock frequency of the image signal is not changed. Therefore, the period during which the image signal is written (effective display period) is The horizontal blanking period is also increased by the length of the horizontal synchronization signal HSYNC, which is the same as before the frame rate change. For this reason, it is possible to increase the number of sub-scans for one horizontal synchronization signal HSYNC.

  The number of sub-scans per horizontal synchronization signal HSYNC after changing the frame rate is calculated from the following equation 1, for example.

Ca = Cb × {(1 / K) × H−d} / (H−d) (1)
Here, Ca and Cb represent the number of sub-scans per horizontal synchronization signal HSYNC of each row electrode after the frame rate change and before the change, respectively. H represents the number of horizontal synchronization signals in one frame, d represents the number of image signals in the effective display period per 1 H, and K represents the frame rate change ratio.

  For example, when H = 450, d = 420, and Cb = 10, when the frame rate is lowered to ½, K = ½, so the number of sub-scans after changing the frame rate is Ca = 160. Become. According to the above-described method, the number of sub-scans per horizontal synchronization signal HSYNC of each row electrode can be increased using a blanking period extended by lowering the frame rate.

  Returning to FIG. 3, in step S <b> 305, the system control unit 105 determines whether or not the display image has been changed by changing the operation mode of the camera 100 after changing the number of sub-scans in step S <b> 304. As a result of the determination, if there is a change in the display image, the process proceeds to S306, and if there is no change in the display image, the process continues at the frame rate and the number of sub-scans that have been changed in S303 and S304.

  In S306, as in S302, the system control unit 105 determines whether the display image after the change is an image with little motion. If the image is not little motion, the system control unit 105 proceeds to S307. Returning to S305, the processing at the frame rate and the number of sub-scans unchanged in S303 and S304 is continued.

  In S307, the system control unit 105 reduces the number of sub-scans with one horizontal synchronization signal HSYNC and increases the number of sub-scans in S304 because the display image after change is an image with a lot of movement or is fast. Return to.

  In S308, the system control unit 105 returns the frame rate of the display device 112 to the state before the frame rate was lowered in S303. Specifically, as in S303, the frequencies of the vertical synchronization signal VSYNC and the horizontal synchronization signal HSYNC are raised, and the state before the frequency reduction is restored in S303. In this way, by raising the frequencies of the vertical synchronization signal VSYNC and the horizontal synchronization signal HSYNC and returning to the state before the frame rate is lowered, the moving body can move smoothly and display so as not to give the user a sense of incongruity.

  Note that the number of sub-scans Ca per horizontal synchronization signal HSYNC when the frame rate is reduced, which is calculated by the above equation 1, is the maximum value that can be increased. Therefore, depending on the sensitivity to be realized, Cb to Ca An appropriate value may be set within the range.

  In addition, depending on the user, there may be a case where it is desired to display an image with a slow motion without reducing the frame rate. Therefore, the user may be able to select whether or not to change the frame rate. In addition, the user may select whether to change the frame rate of the live view display (can be selected and set in advance). If it is set not to change the frame rate according to the frame rate setting of the live view display, even if the image is slow moving, it will be displayed without reducing the frame rate while the live view is displayed. When the view is not being displayed, if a slow moving image is displayed, the frame rate can be reduced to improve the touch operation sensitivity and operation feeling. During live view display, it is a scene where the shutter timing of shooting is being measured, and if the frame rate of live view falls, the shutter timing of a fast-moving subject may be missed. However, by setting the frame rate for live view display so that the frame rate is not changed, the possibility of missing the shutter timing of a fast-moving subject can be reduced. In addition, because the shooting shutter timing is being measured as described above during live view display, there are not many operations by touch operation, so the user can feel the operation feeling without increasing the sensitivity of the touch operation. There is a low possibility of making you feel the problem. On the other hand, when the user views the setting screen of the menu screen that is not displaying the live view or the setting screen when shooting with the optical viewfinder, an operation of quickly changing the shooting setting may be performed. For this reason, if the sensitivity to touch operation, followability, and the like are low, the user may feel inconvenience. Such a setting screen is a display of a slow moving image. According to the present embodiment, the frame rate is lowered and the number of sub-scans is increased, so that the operational feeling can be improved. That is, if the shooting setting screen of the imaging apparatus is used, it is possible to quickly change the shooting setting, and the possibility of missing a shooting opportunity due to a delay in the shooting setting operation can be reduced.

  Furthermore, in the determinations in S302 and S306, it has been described that the determination of whether or not an image with little motion is displayed is determined according to the speed of the moving object in the image, but the speed of the moving object in the image is detected. Instead, the determination may be made as follows. That is, it is determined whether or not a live view image is displayed on the display device 112. If a live view image is displayed, it is determined that a moving image is displayed, and S302 and S306 are each determined as No. To do. If the live view image is not displayed, S302 and S306 are determined to be Yes, assuming that an image with little motion is displayed. Alternatively, it is determined whether or not a moving image is reproduced and displayed on the display device 112. When the moving image is reproduced and displayed, S302 and S306 are respectively determined as No, assuming that a moving image is displayed. If a moving image is being reproduced and displayed, it is determined that S302 and S306 are Yes, respectively, assuming that an image with little motion is displayed. Further, when both the live view and the moving image are determined and at least one of the live view display and the moving image reproduction display is performed on the display device 112, it is assumed that a moving image is displayed. It determines with No. When neither live view display nor moving image playback display is performed, it is determined that S302 and S306 are Yes, respectively, assuming that an image with little motion is displayed. Further, the determinations in S302 and S306 may be based on the scroll speed of the display object displayed on the display device 112. That is, whether or not the display object is scrolled and / or the scrolling speed is determined, and if the display object is scrolled or scrolled at a predetermined speed or higher, a moving image is displayed. S302 and S306 are each determined to be No. If the display object is not scrolled, or if the display object is scrolled but at a speed lower than the predetermined speed, it is determined that S302 and S306 are Yes, respectively, assuming that an image with little movement is displayed. The scrolling of the display object is performed by, for example, a scroll operation (operations such as a button operation, a drag, a flick, and a swipe by a touch operation) by a user. Of course, the determination of the scroll of the display object and the determination of the live view display / moving image reproduction display described above may be combined. In this case, if at least one of live view display, moving image playback display, scroll display / scroll display at a predetermined speed or more is being performed, it is determined that S302 and S306 are No respectively, assuming that a moving image is displayed. To do. If any of live view display, moving image playback display, scroll display / scroll display at a predetermined speed or higher is not performed, S302 and S306 are respectively determined as Yes, assuming that an image with little motion is displayed. That is, when displaying a live view image captured by the imaging unit, displaying a moving image, or displaying a scrolling display object, the live view image captured by the imaging unit is displayed and the moving image is reproduced. Compared with the case where at least one of display and scroll display of the display object is performed, the update cycle is lengthened and the number of sub-scans with one horizontal synchronization signal HSYNC is increased.

  In the present embodiment, the capacitive touch detection method is used. However, the present invention is not limited to this, and any touch panel that sequentially drives the sensor unit by scanning lines may be used. It is applicable. Of course, the number of electrodes, the configuration of the electrodes, and the touch detection method are not limited. For example, it is not limited to the configuration of the AD converter or the integration circuit, the order of data conversion, and the presence or absence. In this embodiment, a configuration called an in-cell touch panel is adopted, but the present invention can also be applied to touch panels of other methods.

  Note that the control of the system control unit 105 may be performed by a single piece of hardware, or the entire apparatus may be controlled by a plurality of pieces of hardware sharing the processing.

  Although the present invention has been described in detail based on the preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms without departing from the gist of the present invention are also included in the present invention. included.

  In the above-described embodiment, the case where the present invention is applied to an interchangeable lens single-lens reflex digital camera has been described as an example. However, the present invention is not limited to this example, and a touch detection function is mounted on a display device. Any device can be applied. That is, the present invention relates to a personal computer, a tablet that is a kind thereof, a mobile phone and a smartphone that is a kind thereof (including eyeglass-type terminals and wristwatch-type terminals), a PDA (personal digital assistant), a portable image viewer, and a display device. It can be applied to printers, digital photo frames, music players, game machines, electronic book readers, facsimile machines, copiers, and other office equipment, medical equipment such as electrocardiograms and blood pressure monitors, and ATMs (automated teller machines). .

[Other Embodiments]
The present invention supplies a program that realizes 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 This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

DESCRIPTION OF SYMBOLS 105 ... System control part, 118 ... Variable frame rate control part, 112 ... Display apparatus, 115 ... Touch panel part, 214 ... Column electrode, 215 ... Row electrode

Claims (13)

Display means comprising a touch panel having a plurality of sensor portions arranged with a plurality of electrodes intersecting with each other;
Variable means for variably controlling the update cycle of the video signal displayed on the display means;
Detection means for sequentially driving the plurality of sensor units to generate detection signals for touch detection;
The detection is performed such that the number of times that the sensor unit is driven by the detection unit during the blanking period of the video signal is increased when the update period of the video signal changed by the variable unit is shorter than when the update period is short. And a control means for controlling a touch detection operation by the means.   The control means increases the number of times the sensor unit is driven during the blanking period of the video signal when the variable means is changed so that the update cycle of the video signal becomes longer, and updates the video signal. 2. The display device according to claim 1, wherein when the period is changed to be shortened, the detection unit is controlled so that the number of times the sensor unit is driven in the blanking period of the video signal is decreased. . The plurality of sensor units are:
A plurality of first electrodes and second electrodes are arranged to intersect with each other, and a detection signal corresponding to a touch operation on the touch panel is generated at an intersection of the first electrode and the second electrode,
Either the first electrode or the second electrode is shared with an electrode for driving a pixel of the display means,
The detection means includes
Driving means for driving the scanning line a predetermined number of times during a blanking period of the video signal, with one of the first electrode and the second electrode serving as a scanning line and the other serving as a readout line;
Integrating means for integrating the detection signals output from the readout lines by driving the scanning lines;
Determination means for performing touch detection by comparing the integrated detection signal with a predetermined threshold,
When the variable means is changed so that the update period of the video signal is increased, the control means is configured to increase the number of integrations by the integration means during the blanking period of the video signal. When the number of times of driving is changed so that the update period of the video signal is shortened, the number of times of driving of the scanning line is changed so that the number of times of integration by the integrating means during the blanking period of the video signal is reduced. The display device according to claim 2, wherein:   The variable means changes only the frequency of the vertical synchronizing signal and the horizontal synchronizing signal of the video signal output to the pixel of the display means, and changes the update cycle without changing the clock frequency of the video signal. The display device according to any one of claims 1 to 3. It further has an acquisition means for acquiring the presence / absence of a moving object and a moving speed of the moving object by detecting a motion vector of a subject in continuous images,
5. The display device according to claim 1, wherein the variable unit changes an update cycle in accordance with a motion of the moving body obtained by the acquisition unit.   The variable means is characterized in that the update cycle when the motion of the moving object is small or the moving speed of the moving object is slow is longer than the update cycle when the motion of the moving object is large or the moving speed of the moving object is fast. The display device according to claim 5.   The display device according to claim 5, wherein the variable unit makes an update cycle when there is no motion of the moving body longer than an update cycle when there is motion of the moving body.   The variable means is configured to display a live view image picked up by the image pickup means when displaying the live view image picked up by the image pickup means, displaying a moving image, or displaying a scrolling display object. 5. The display device according to claim 1, wherein an update cycle is lengthened as compared with a case where at least one of an image display, a moving image reproduction display, and a scroll display of a display object is performed. .   9. The display device according to claim 1, wherein an update period of the video signal by the variable means can be selected by a user.   10. The display device according to claim 1, wherein when the touch detection function of the touch panel is set to off, the variable unit does not change the update cycle of the video signal. . Display means comprising a touch panel having a plurality of sensor portions arranged with a plurality of electrodes intersecting with each other;
Variable means for variably controlling the update cycle of the video signal displayed on the display means;
A control method for a display device, comprising: a detection unit that sequentially drives the plurality of sensor units to generate a detection signal for touch detection,
The detection is performed such that the number of times that the sensor unit is driven by the detection unit during the blanking period of the video signal is increased when the update period of the video signal changed by the variable unit is shorter than when the update period is short. A control method for a display device, comprising a step of controlling a touch detection operation by means.   The program for functioning a computer as each means of the display apparatus as described in any one of Claims 1 thru | or 10.   A computer-readable storage medium storing a program for causing a computer to function as each unit of the display device according to any one of claims 1 to 10.

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