TWI502421B - Apparatus and method for adjusting sampling rate of touch panel - Google Patents

Description

Touch panel sampling frequency adjustment device and method

The present invention relates to a touch electronic device, and more particularly to an apparatus and method for adjusting a sampling frequency of a touch panel.

When a user operates a conventional touch electronic device (such as a smart phone or a tablet), the sampling rate of the touch panel is often a fixed frequency. However, the sampling frequency requirements will vary in different operating environments or when using different application programs (APs).

If the current sampling frequency requirement is less than the sampling frequency of the touch panel, an excessively high sampling frequency may cause the touch electronic device to consume more power. For example, when the user is operating the touch electronic device to read the file, the sampling frequency requirement of the reading file is a low sampling frequency. The low sampling frequency can reduce the power consumption of the touch electronic device.

If the current sampling frequency requirement is greater than the sampling frequency of the touch panel, the user's operation is not good because the sampling frequency is too low. For example, when a user is playing a game (such as a fighting game), the sampling frequency of the game is required to be a high sampling frequency, so that the response of the user operation is smoother/immediate.

The invention provides a device and a method for adjusting a sampling frequency of a touch panel, so as to provide a feedback mechanism between the operating system and the touch wafer, so that the adjusting device/method can dynamically adjust the sampling of the touch panel according to the operating situation requirements. frequency.

The embodiment of the invention provides a method for adjusting the sampling frequency of the touch panel. The method includes: detecting, by the touch chip, whether the touch panel has a touch event; when the touch event occurs, analyzing the operation situation requirement to obtain an analysis result; and dynamically adjusting the touch according to the analysis result The sampling frequency of the wafer to the touch panel.

The embodiment of the invention provides a device for adjusting the sampling frequency of the touch panel, which comprises a detection module, an analysis module and an adjustment module. The detection module detects whether the touch panel has a touch event via the touch wafer. The analysis module is coupled to the detection module to receive touch information of the touch event. When the touch event occurs, the analysis module analyzes the operational situation requirements to obtain the analysis result. The adjustment module is coupled to the analysis module to receive the analysis result. The adjustment module dynamically adjusts the sampling frequency of the touch panel to the touch panel according to the analysis result.

Based on the above, the apparatus and method for adjusting the sampling frequency of the touch panel according to the embodiment of the present invention can provide a feedback mechanism between the operating system and the touch wafer. Therefore, the adjusting device/method can dynamically adjust the sampling frequency of the touch panel according to the operating situation requirements, so that the sampling frequency of the touch panel meets the requirements of the user's operating situation.

The above described features and advantages of the present invention will be more apparent from the following description.

The term "coupled" as used throughout the specification (including the scope of the patent application) may be used in any direct or indirect connection. For example, if the first device is described as being coupled to the second device, it should be construed that the first device can be directly connected to the second device, or the first device can be connected through other devices or some kind of connection means. Connected to the second device indirectly. In addition, wherever possible, the elements and/ Elements/components/steps that use the same reference numbers or use the same terms in different embodiments may refer to the related description.

1 is a functional block diagram of a touch electronic device according to an embodiment of the invention. The touch electronic device includes a touch panel 11 and a touch wafer 12 . The touch wafer 12 is coupled to the plurality of electrode lines of the touch panel 11 to drive the touch panel 11 . The touch chip 12 periodically detects whether the touch panel 11 has a touch event according to a preset sampling frequency. For example, when the user touches the sensing area of the touch panel 11 with a finger (or an object), the touch wafer 12 can detect that a touch event occurs in the sensing area of the touch panel 11.

The touch chip 12 can directly or indirectly transmit the touch information of the touch event to the operating system of the touch electronic device. For example, when the user slides on the touch panel 11 with a finger (or an item), the operating system should The program (for example, an e-book reader) can perform a page turning operation according to the touch information provided by the touch wafer 12. Therefore, the user can operate the touch electronic device to read the file.

Referring to FIG. 1 , the touch panel sampling frequency adjustment apparatus 100 includes a detection module 110 , an analysis module 120 , and an adjustment module 130 . The detection module 110 is coupled to the touch wafer 12 of the touch panel 11 . In some embodiments, the detection module 110, the analysis module 120, and/or the adjustment module 130 can be implemented in a hardware manner. For example, the detection module 110, the analysis module 120, and/or the adjustment module 130 are each implemented as different integrated circuits. For another example, the detection module 110, the analysis module 120, and/or the adjustment module 130 are integrated into the same integrated circuit. The hardware-enabled detection module 110, the analysis module 120, and/or the adjustment module 130 can be controlled by the operating system of the touch electronic device. For example, the analysis module 120 can transmit touch information or analysis results to the operating system. As another example, the analysis module 120 can receive adjustment information/commands of the sampling frequency from the operating system.

In other embodiments, the detection module 110, the analysis module 120, and/or the adjustment module 130 can be implemented by using a firmware. For example, the detection module 110, the analysis module 120, and/or the adjustment module 130 are each implemented in a firmware manner on different microcontrollers. For example, the detection module 110, the analysis module 120, and/or the adjustment module 130 are integrated into the same firmware. The detection module 110, the analysis module 120 and/or the adjustment module 130 implemented in a firmware manner can be controlled by the operating system of the touch electronic device.

In other embodiments, the detection module 110, the analysis module 120, and/or the adjustment module 130 can be implemented by using a software method. For example, the detection module 110, the analysis module 120, and/or the adjustment module 130 are each implemented in a software application to different applications (or drivers). For another example, the detection module 110, the analysis module 120, and/or the adjustment module 130 are integrated into the same program. The detection module 110, the analysis module 120 and/or the adjustment module 130 implemented in a software manner can be operated in the operating system environment of the touch electronic device.

FIG. 2 is a schematic flow chart illustrating a method for adjusting a sampling frequency of a touch panel according to an embodiment of the invention. Referring to FIG. 1 and FIG. 2 , the touch wafer 12 sets the sampling frequency of the touch panel 11 in step S210 . In some embodiments, when the touch control device is initialized, the touch wafer 12 sets the sampling frequency to an initial value in step S210. In other embodiments, the touch wafer 12 can record the current sampling frequency in a non-volatile memory. Therefore, when the touch control device is initialized, the touch wafer 12 can set the sampling frequency according to the content of the non-volatile memory in step S210.

After the step S210 is completed, the touch wafer 12 periodically detects the touch panel 11 according to the sampling frequency set in step S210. Therefore, the detecting module 110 can detect whether the touch panel 11 has a touch event via the touch wafer 12 in step S220. The touch event includes a single-finger (or multi-finger) click event or a mobile event. The detection module 110 can perform click behavior detection and/or motion behavior detection according to the touch information provided by the touch chip 12 .

The analysis module 120 is coupled to the output of the detection module 110 to receive touch information of the touch event. When a touch event occurs, the analysis module 120 proceeds to step S230 to analyze the operational context requirements and obtain the analysis result. In some embodiments, the analysis operation scenario includes: the analysis module 120 analyzes the correspondence between the touch information of the touch event and the user's operation behavior, and adjusts the sampling frequency through the adjustment module 130 according to the touch information. For example, in some embodiments, the analysis module 120 can obtain the x and y coordinates of the touch point on the touch panel 11, and then adjust the sampling frequency through the adjustment module 130 according to the x and y coordinates of the touch point. For example, the touch panel 11 has a game area and a non-game area. When the touch point of the user is located in the non-game area, the analysis module 120 can set the sampling frequency to the "normal sampling frequency" through the adjustment module 130. When the touch point of the user is located in the game area, the analysis module 120 can set the sampling frequency to a "high sampling frequency" greater than the normal sampling frequency through the adjustment module 130, so as to make the response of the user's operation behavior more Smooth / instant.

In other embodiments, the analysis module 120 can analyze the time difference of the user's touch behavior, and then adjust the sampling frequency through the adjustment module 130 according to the time difference. The time difference of the touch behavior includes a single finger (or multiple fingers) time difference between a previous click behavior of the touch panel 11 click and a current click behavior, and/or a single finger (or multiple fingers) on the touch panel 11 The time difference between a previous movement behavior of the upper movement and a current movement behavior. For example, the click/move behavior of the user on the touch panel 11 is very fast and frequent when the user is playing a fighting game with respect to the general operation. Therefore, if the time difference between the click/move behavior is greater than the critical value (threshold, for example, 0.5 seconds), the analysis module 120 can set the sampling frequency to the "normal sampling frequency" through the adjustment module 130. If the time difference between the click/move behavior is less than the threshold, the analysis module 120 can set the sampling frequency to be higher than the normal sampling frequency by the adjustment module 130, so as to make the user's operation behavior more responsive. For smooth / instant.

In other embodiments, the analysis module 120 can analyze the moving distance of the touch point on the touch panel 11 and then adjust the sampling frequency through the adjustment module 130 according to the moving distance. For example, if the moving distance of the touch point is greater than a threshold (for example, 20 mm), the analysis module 120 can set the sampling frequency to the "normal sampling frequency" through the adjustment module 130. If the moving distance of the touch point is less than the threshold, the analysis module 120 can set the sampling frequency to a "high sampling frequency" greater than the normal sampling frequency through the adjustment module 130, so as to make the response of the user's operation behavior more Smooth / instant.

In other embodiments, the analysis module 120 can analyze the moving direction of a touch point, and then adjust the sampling frequency through the adjustment module 130 according to the moving direction. For example, if the moving direction of the touch point is up or down, the analysis module 120 can set the sampling frequency to the "normal sampling frequency" through the adjustment module 130. If the moving direction of the touch point is leftward or backward, the analysis module 120 can set the sampling frequency to be higher than the "high sampling frequency" of the normal sampling frequency through the adjustment module 130.

In other embodiments, the analysis operation scenario requirement in step S230 includes: the analysis module 120 analyzes the correspondence between the touch information of the touch event and the current operating system environment, and transmits the adjustment mode according to the touch information. Group 130 adjusts the sampling frequency. For example, the analysis module 120 can analyze the current application of the operating system and determine a target sampling frequency based on the current application. If the current application is a web browser, the analysis module 120 can set the sampling frequency to the "normal sampling frequency" through the adjustment module 130. If the current application is an e-book reader, the analysis module 120 can set the sampling frequency to be lower than the "low sampling frequency" of the normal sampling frequency by the adjustment module 130 to reduce the power consumption of the touch wafer 12. If the current application is a fighting game program, the analysis module 120 can set the sampling frequency to a "high sampling frequency" greater than the normal sampling frequency through the adjustment module 130, so as to make the response of the user's operation behavior smoother. /immediate.

For another example, the analysis module 120 can analyze the current state of the operating system and determine the target sampling frequency according to the current state. If the current state is the normal operation mode, the analysis module 120 can set the sampling frequency to the "normal sampling frequency" through the adjustment module 130. If the current state is a power saving mode (or a standby mode, an idle mode, or a sleep mode, or a sleep mode), the analysis module 120 can set the sampling frequency to be smaller than the The "low sampling frequency" of the normal sampling frequency to reduce the power consumption of the touch wafer 12.

The adjustment module 130 is coupled to the output of the analysis module 120 to receive the analysis result. The adjustment module 130 performs step S240 to dynamically adjust the sampling frequency of the touch panel 12 to the touch panel 11 according to the analysis result of the analysis module 120. In some embodiments, the adjustment module 130 correspondingly determines a weighting value according to the analysis result of the analysis module 120. And providing the weight value to the touch wafer 12 to control the touch wafer 12 to adjust the sampling frequency according to the weight value. In other embodiments, the adjustment module 130 correspondingly determines a frequency data according to the analysis result of the analysis module 120, and provides the frequency value to the touch wafer 12 to control the touch wafer 12 according to the The frequency value adjusts the sampling frequency.

Therefore, the adjusting device 100 in the above embodiment can provide a feedback mechanism between the operating system and the touch wafer 12. The adjusting device/method can dynamically adjust the sampling frequency of the touch panel 11 according to the operating situation requirements, so that the sampling frequency of the touch panel 11 meets the requirements of the user's operating situation.

FIG. 3 is a block diagram showing the function of a touch electronic device according to another embodiment of the invention. The embodiment shown in FIG. 3 can be analogized with reference to the related description of FIG. 1. Different from the embodiment shown in FIG. 1 , the apparatus for adjusting the sampling frequency of the touch panel in the embodiment shown in FIG. 3 includes a detection module 310 , a recording module 320 , an analysis module 330 , and an adjustment module 340 . The detection module 310, the recording module 320, the analysis module 330, and/or the adjustment module 340 can be implemented by using hardware, firmware, and/or software. The detection module 310, the analysis module 330, and the adjustment module 340 can be analogized with reference to the descriptions of the detection module 110, the analysis module 120, and the adjustment module 130 in FIG.

FIG. 4 is a schematic flow chart illustrating a method for adjusting a sampling frequency of a touch panel according to another embodiment of the invention. Steps S410, S420, S440, and S450 in the embodiment shown in FIG. 4 can be analogized with reference to the descriptions of steps S210, S220, S230, and S240 in FIG. 2, respectively. Different from the embodiment shown in FIG. 2, the embodiment shown in FIG. 4 further includes step S430.

The recording module 320 is coupled between the detection module 310 and the analysis module 330. When a touch event occurs, the recording module 320 performs step S430 to record the current function and the touch behavior of the touch event detected by the detection module 310. In some embodiments, the recording module 320 can record the touch behavior of the touch event detected by the detection module 310 and record the function corresponding to the touch behavior. For example, if the user operates an e-book reader (application) to read the contents of the file, the user performs a long-distance sliding (moving behavior) on the touch panel 11 to perform a page turning function on the file. Therefore, the recording module 320 can record the correspondence between the touch behavior (sliding of a long distance) and the file turning function. For another example, the user performs a click behavior on the touch panel 11 to perform a page turning function on the file. Therefore, the recording module 320 can record the correspondence between the click behavior and the file paging function.

After each touch event occurs, the recording module 320 can record the touch behaviors and corresponding functions of the touch events in step S430. Therefore, the analysis module 330 can analyze the historical data recorded by the recording module 320 in step S440 to obtain a correspondence between different click behaviors and different functions. Based on the historical data, the analysis module 330 can determine the function corresponding to the touch behavior of the current touch event in step S440, and determine the target sampling frequency according to the corresponding function. In step S450, the adjustment module 130 can adjust the sampling frequency of the touch panel 11 to the touch panel 11 according to the target sampling frequency determined by the analysis module 330.

However, the recorded content of the recording module 320 in step S430 should not be limited to the foregoing embodiment. For example, in another embodiment, after each touch event occurs, the recording module 320 can record the "current function" in step S430 and record the trigger time of the "current touch event". Therefore, the analysis module 330 can analyze the historical data recorded by the recording module 320 in step S440 to obtain a correspondence between different trigger times and different functions. Based on the historical data, the analysis module 330 can determine the function corresponding to the current touch event in step S440, and determine the target sampling frequency according to the corresponding function. For example, the analysis module 330 can analyze, from the historical data, a time difference between a previous click behavior of a single finger (or multiple fingers) clicking on the touch panel 11 and a current click behavior, and/or a single finger (or more) Refers to the time difference between a previous movement behavior of moving on the touch panel 11 and a current movement behavior. The analysis module 330 further analyzes the correspondence between the time difference of different click/move behaviors and different functions from these historical data. Therefore, the analysis module 330 can determine the function corresponding to the time difference of the current touch event, and then determine the target sampling frequency according to the corresponding function.

In another embodiment, after each touch event occurs, the recording module 320 can record the "current application" and record the "current touch event" in step S430. Therefore, the analysis module 330 can analyze the historical data recorded by the recording module 320 in step S440 to obtain a correspondence between different touch events and different application programs. Based on the historical data, the analysis module 330 can determine, in step S440, the application program corresponding to the current touch event, and then follow the corresponding application process. Determine the target sampling frequency. For example, the analysis module 330 can analyze from the historical data that when the movement track of the touch point is long and has a geometric shape (for example, a circle, etc.), the application corresponding to the touch event is a drawing program. . Therefore, once the analysis module 330 determines that the application corresponding to the current touch event is a drawing program, the analysis module 330 can set the sampling frequency to a "high sampling frequency" through the adjustment module 340 for the user to operate. The behavioral response is more fluid/instant.

In a further embodiment, after each touch event occurs, the recording module 320 can record "current multimedia content" (eg, picture, text, video or other category) and record "current touch event" in step S430. "." Therefore, the analysis module 330 can analyze the historical data recorded by the recording module 320 in step S440 to obtain a correspondence between different touch events and different multimedia contents. Based on the historical data, the analysis module 330 can determine the multimedia content/category corresponding to the current touch event in step S440, and determine the target sampling frequency according to the corresponding multimedia content/category.

Take a mobile phone or tablet as an example. When the user operates the touch panel 11 of the touch phone or the tablet, the recording module 320 inside the mobile phone or the tablet records the user's operation behavior for a period of time, and the operating system can be used according to the analysis module 330. The operation behavior of the person dynamically adjusts the sampling frequency of the touch panel 11. And/or, the mobile phone or the tablet can also determine the sampling frequency of the touch panel 11 according to the application selected by the user, so that the application can operate more smoothly.

However, in other embodiments, the analysis/decision method of analysis module 330 (or 120) should not be limited to the above-described embodiments. For example, Table 1 illustrates the correspondence between different touch events and different sampling frequency adjustments according to another embodiment.

The "-" in Table 1 indicates that don't care. In this embodiment, each time the operating system switches between different programs (for example, an application), the analysis module 330 can first set the sampling frequency to a preset scanning frequency (for example, an initial value or a normal sampling frequency) through the adjustment module 340. ,after that The touch event is analyzed according to the definition of Table 1, and then the sampling frequency is adjusted or lowered correspondingly by the adjustment module 340.

FIG. 5 is a flow chart showing a method for adjusting a sampling frequency of a touch panel according to a further embodiment of the present invention. Steps S510, S520, S530, S540, and S560 in the embodiment shown in FIG. 5 can be analogized with reference to the descriptions of steps S410, S420, S430, S440, and S450 in FIG. 4, respectively. Different from the embodiment shown in FIG. 4, the embodiment shown in FIG. 5 further includes step S550. In this embodiment, the analysis module 330 can count the time. When the analysis module 330 determines in step S550 that the time has not reached the adjustment period (for example, 1 second or other period), the recording module 320 and the analysis module 330 perform step S520 to step S540 again. When the analysis module 330 determines in step S550 that the time has reached the adjustment period, the analysis module 330 resets the counted time and proceeds to step S560.

In summary, the above embodiments can provide a feedback mechanism in the operating system, so that the operating system, the driver and/or the application can control the driving chip 12 to dynamically adjust the sampling frequency of the touch panel 11. The above embodiments can dynamically increase or decrease the sampling frequency of the touch panel 11 according to different usage environments and/or user operating conditions to conform to the user's operating situation/demand. For the operating environment with high sampling frequency requirements, the above embodiments can dynamically increase the sampling frequency of the touch panel 11 to make the response of the user's operation behavior smoother/immediate. For the operating environment of the low sampling frequency, the above embodiments can dynamically reduce the sampling frequency of the touch panel 11 to make the touch electronic device more power efficient.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

11‧‧‧Touch panel

12‧‧‧ touch chip

100, 300‧‧‧ touch panel sampling frequency adjustment device

110, 310‧‧‧Detection module

120, 330‧‧‧ Analysis Module

130, 340‧‧‧ adjustment module

320‧‧‧recording module

S210~S240, S410~S450, S510~S560‧‧‧ steps

1 is a functional block diagram of a touch electronic device according to an embodiment of the invention.

FIG. 2 is a schematic flow chart illustrating a method for adjusting a sampling frequency of a touch panel according to an embodiment of the invention.

FIG. 3 is a block diagram showing the function of a touch electronic device according to another embodiment of the invention.

FIG. 4 is a schematic flow chart illustrating a method for adjusting a sampling frequency of a touch panel according to another embodiment of the invention.

FIG. 5 is a flow chart showing a method for adjusting a sampling frequency of a touch panel according to a further embodiment of the present invention.

S210~S240‧‧‧Steps

Claims (22)

A method for adjusting a sampling frequency of a touch panel includes: detecting whether a touch event occurs on a touch panel via a touch wafer; and analyzing an operational situation requirement when the touch event occurs to obtain an analysis result; And dynamically adjusting the sampling frequency of the touch panel to the touch panel according to the analysis result. The method for adjusting a sampling frequency of a touch panel according to the first aspect of the invention, wherein the touch event comprises a click event or a moving event. The method for adjusting the sampling frequency of the touch panel according to the first aspect of the invention, wherein the analyzing an operational situation requirement comprises: analyzing a correspondence between the touch information of the touch event and a user operation behavior; or analyzing the The correspondence between the touch information and the current operating system environment. The method for adjusting the sampling frequency of the touch panel according to the third aspect of the invention, wherein the mapping between the touch information of the touch event and the user operation behavior includes: analyzing a time difference of a touch behavior; analyzing one The moving distance of the touch point; or the direction of movement of a touch point. The method for adjusting a sampling frequency of a touch panel according to claim 4, wherein the time difference of the touch behavior includes a previous click line The time difference from a current click behavior, or the time difference between a previous move behavior and a current move behavior. The method for adjusting a sampling frequency of a touch panel according to the third aspect of the invention, wherein the mapping between the touch information of the touch event and the current operating system environment comprises: analyzing an current application of the operating system; The current application determines a target sampling frequency. The method for adjusting the sampling frequency of the touch panel according to the first aspect of the invention, wherein the dynamically adjusting the sampling frequency of the touch panel to the touch panel comprises: providing a weight value to the touch wafer to control the The touch wafer adjusts the sampling frequency according to the weight value; or provides a frequency value to the touch wafer to control the touch wafer to adjust the sampling frequency according to the frequency value. The method for adjusting the sampling frequency of the touch panel according to the first aspect of the patent application includes: recording a current function and a touch behavior of the touch event. The method for adjusting the sampling frequency of the touch panel according to the eighth aspect of the invention, wherein the current function and the touch behavior for recording the touch event include: recording a function corresponding to a touch behavior; recording the touch The trigger time of the event; record the application corresponding to the touch event; or record the multimedia content corresponding to the touch event. The method for adjusting a sampling frequency of a touch panel according to claim 9, wherein the touch behavior includes a click behavior or a mobile behavior. The method for adjusting a sampling frequency of a touch panel according to claim 9 , wherein the multimedia content comprises a picture, a text or a movie. A touch panel sampling frequency adjusting device includes: a detecting module coupled to a touch panel of a touch panel, wherein the detecting module detects the touch panel via the touch wafer Whether a touch event occurs; an analysis module is coupled to the detection module to receive touch information of the touch event, wherein the analysis module analyzes an operational situation requirement when the touch event occurs, Obtaining an analysis result; and an adjustment module coupled to the analysis module to receive the analysis result, wherein the adjustment module dynamically adjusts a sampling frequency of the touch panel to the touch panel according to the analysis result. The apparatus for adjusting a sampling frequency of a touch panel according to claim 12, wherein the touch event comprises a click event or a moving event. The apparatus for adjusting the sampling frequency of the touch panel according to claim 12, wherein the analysis module analyzes the correspondence between the touch information of the touch event and the user's operation behavior, or analyzes the touch information and The corresponding relationship of the current operating system environment. The apparatus for adjusting a sampling frequency of a touch panel according to claim 12, wherein the analysis module analyzes a time difference of a touch behavior, Either analyze the moving distance of a touch point or analyze the moving direction of a touch point. The apparatus for adjusting the sampling frequency of the touch panel according to claim 15, wherein the time difference of the touch behavior includes a time difference between a previous click behavior and a current click behavior, or a previous movement behavior and a current movement behavior. The time difference. The apparatus for adjusting a sampling frequency of a touch panel according to claim 12, wherein the analysis module analyzes a current application of the operating system and determines a target sampling frequency according to the current application. The apparatus for adjusting a sampling frequency of a touch panel according to claim 12, wherein the adjusting module provides a weight value to the touch wafer to control the touch wafer to adjust the sampling frequency according to the weight value; or The adjustment module provides a frequency value to the touch wafer to control the touch wafer to adjust the sampling frequency according to the frequency value. The apparatus for adjusting the sampling frequency of the touch panel according to claim 12, further comprising: a recording module coupled between the detecting module and the analyzing module, wherein the recording module records a current Function and touch behavior of the touch event. The apparatus for adjusting the sampling frequency of the touch panel according to claim 19, wherein the recording module records a function corresponding to a touch behavior, or records a trigger time of the touch event, or records the touch The application corresponding to the event, or the multimedia content corresponding to the touch event. The apparatus for adjusting a sampling frequency of a touch panel according to claim 20, wherein the touch behavior includes a click behavior or a mobile behavior. The apparatus for adjusting a sampling frequency of a touch panel according to claim 20, wherein the multimedia content comprises a picture, a text or a movie.