CN103105960A - Touch panel and touch method thereof - Google Patents

Abstract

The invention discloses a touch panel and a touch method thereof, wherein the touch method is suitable for the touch panel, the touch panel is provided with a first touch sensing unit and a second touch sensing unit, and the first touch sensing unit and the second touch sensing unit are respectively positioned at a first side edge and a second side edge which are opposite to the touch panel. The touch control method comprises the following steps. The sliding state of a first object and a second object on the first touch sensing unit and the sliding state of the second object on the second touch sensing unit are respectively sensed to generate a first sensing signal and a second sensing signal. And receiving and outputting a corresponding operation instruction according to the first sensing signal and the second sensing signal. Therefore, the hand movement of the user can be reduced, the physiological damage caused by overuse can be reduced, and the use convenience can be improved.

Description

Touch panel and its touch method

technical field

The present invention relates to a touch panel, in particular to a touch panel and a touch method thereof.

Background technique

In recent years, the functions of portable electronic devices have become more and more diversified, and the volume has become smaller and smaller, and the technology of touch panels has gradually matured, thus prompting various touch devices to be widely used in various portable electronic devices. on the electronic device. Therefore, the portable electronic device combined with touch input is also convenient for people to use.

Taking a handheld tablet computer as an example, a touch panel is configured on the tablet computer, and the user clicks on the touch panel with a finger or touches the touch panel to complete an input action and then operate the tablet computer. However, an overly large touch panel will make the user's fingers need to move a relatively large distance to complete the aforementioned actions when the user clicks on the screen or drags the screen. In this way, when the user holds the tablet computer with one hand and operates the tablet computer with the other hand, the user may overuse the fingers of the tablet computer and cause physical damage, thereby causing operational inconvenience.

In addition, no matter whether the user directly uses a finger or an auxiliary tool to perform touch operations such as clicking on the screen or dragging the screen, the user's vision may be blocked, resulting in errors in the input operation. Therefore, there is still room for improvement in the touch control method of the portable electronic device.

Contents of the invention

In view of the above problems, the purpose of the present invention is to provide a touch panel and its touch method, thereby reducing the hand movements of the user's single-handed operation, reducing the physiological damage caused by excessive use, and increasing the convenience of use .

A touch method disclosed in the present invention is suitable for a touch panel, the touch panel has a first touch sensing unit and a second touch sensing unit, the first touch sensing unit and the The second touch sensing unit is located on opposite first side and second side of the touch panel respectively. The touch method includes the following steps. respectively sensing the sliding state of the first object and the second object on the first touch sensing unit and the sliding state on the second touch sensing unit to generate a first sensing signal and a second sensing test signal. receiving and outputting corresponding operation instructions according to the first sensing signal and the second sensing signal;

In one embodiment, the aforementioned step of receiving and outputting the corresponding operation instruction according to the first sensing signal and the second sensing signal includes the following steps. When the first sensing signal and the second sensing signal are simultaneously the first object and the second object along the short axis of the first touch sensing unit and the second touch When the short axis of the control sensing unit slides toward the outside of the touch panel, the corresponding operation command for zooming in the screen is output. When the first sensing signal and the second sensing signal are simultaneously the first object and the second object along the short axis of the first touch sensing unit and the second touch When the short axis of the control sensing unit slides toward the inner side of the touch panel, output the corresponding operation instruction of shrinking the screen.

In one embodiment, the touch panel further has a third side and a fourth side, wherein the third side and the fourth side are opposite to each other, and the aforementioned received and based on the first sense The detection signal and the second sensing signal, and the step of outputting the corresponding operation instruction includes the following steps. When the first sensing signal is generated by sliding the first object toward the third side along the long axis of the first touch sensing unit and the second sensing signal is the first When the two objects slide toward the fourth side along the long axis of the second touch sensing unit, the corresponding operation instruction of rotating the screen clockwise is output. When the first sensing signal is generated by sliding the first object toward the fourth side along the long axis of the first touch sensing unit and the second sensing signal is the first When the two objects slide toward the third side along the long axis of the second touch-sensing unit, the corresponding operation instruction of rotating the screen counterclockwise is output.

In one embodiment, the aforementioned step of receiving and outputting the corresponding operation instruction according to the first sensing signal and the second sensing signal includes the following steps. When the first sensing signal is generated when the first object slides toward the outside of the touch panel along the short axis of the first touch sensing unit, the corresponding image of the previous page is output. Operating instructions. When the second sensing signal is generated by the second object sliding toward the outside of the touch panel along the short axis of the second touch sensing unit, the corresponding image of the next page is output. Operating instructions.

In one embodiment, the aforementioned step of receiving and outputting the corresponding operation instruction according to the first sensing signal and the second sensing signal includes the following steps. When the first sensing signal is generated by the first object pressing on the first touch sensing unit, according to the sliding of the second object on the second touch sensing unit The second sensing signal generated by the direction is used to output the corresponding operation command of the screen dragging action or when the second object is pressed on the second touch sensing unit, according to the first The second sensing signal generated by the sliding direction of the object on the first touch sensing unit is used to output the corresponding operation instruction of the screen dragging action.

The present invention also discloses a touch panel, including a first touch sensing unit, a second touch sensing unit and a processing unit. The first touch sensing unit is located on the first side of the touch panel, and is used for sensing a sliding state of a first object on the first touch sensing unit to generate a first sensing signal. The second touch sensing unit is located on the second side of the touch panel, and is used to sense the sliding state of the second object on the second touch sensing unit to generate a second sensing signal, wherein the The first side and the second side are opposite to each other. The processing unit is coupled to the first touch sensing unit and the second touch sensing unit for receiving and outputting corresponding operation instructions according to the first touch signal and the second touch signal .

In an embodiment, when the first touch sensing unit and the second touch sensing unit simultaneously sense the first object and the second object along the first touch When the short axis of the touch sensing unit and the second touch sensing unit slides toward the outside or inside of the touch panel, the corresponding operation command output by the processing unit is to zoom in or zoom out the screen.

In one embodiment, the touch panel further has a third side and a fourth side, wherein the third side and the fourth side are opposite to each other, when the first touch sensing unit Sensing that the first object slides toward the third side along the long axis of the first touch sensing unit and the second touch sensing unit sensing that the second object slides along the When the long axis of the second touch sensing unit slides toward the fourth side, the corresponding operation instruction output by the processing unit is to rotate the screen clockwise, and when the first touch sensing unit senses It is detected that the first object slides toward the fourth side along the long axis of the first touch sensing unit and the second touch sensing unit senses that the second object slides along the long axis of the first touch sensing unit. When the long axis of the second touch sensing unit slides toward the third side, the corresponding operation command output by the processing unit is to rotate the screen counterclockwise.

In an embodiment, when the first object of the first touch sensing unit slides toward the outside of the touch panel along the short axis of the first touch sensing unit and the second When the touch sensing unit does not sense the sliding of the second object, the corresponding operation command output by the processing unit is a previous page; when the second touch sensing unit senses that the second object When two objects slide toward the outside of the touch panel along the short axis of the second touch sensing unit and the first touch sensing unit does not sense the sliding of the first object, the processing The corresponding operation command output by the unit is the next page screen.

In one embodiment, when the first touch sensing unit senses that the first object is pressed on the first touch sensing unit, the corresponding operation output by the processing unit The instruction is to generate a screen dragging action according to the sliding direction of the second object on the second touch sensing unit, or when the second sensing signal is sensed by the second touch sensing unit When the second object is pressed on the second touch-sensing unit, the corresponding operation command output by the processing unit is based on the first object being pressed on the first touch-sensing unit. The screen dragging action is generated according to the sliding direction on the unit.

A touch panel and a touch method thereof of the present invention are configured by arranging a first touch sensing unit and a second touch sensing unit on opposite sides of the touch panel, and respectively sensing the first object on the second touch panel. The sliding state on the first touch sensing unit and the sliding state of the second object on the second touch sensing unit are used to output corresponding operation signals. In this way, when the user holds the portable electronic device with the touch panel in both hands, he can directly use the thumbs held on both sides of the touch panel to operate the portable electronic device without blocking the use of the device. The user's vision to increase the convenience of use, and can reduce the hand movement of the user's one-handed operation, so as to reduce the physiological damage caused by excessive use.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

1 is a schematic diagram of a touch panel of the present invention;

2 to 9 are schematic diagrams of the operation of the touch panel of the present invention;

FIG. 10 is a flow chart of the touch control method of the present invention.

Components where the reference designation

100 touch panel

101 first side

102 second side

103 third side

104 fourth side

110 first touch sensing unit

111 Minor axis of the first touch sensing unit 110

112 Long axis of the first touch sensing unit 110

120 second touch sensing unit

121 Minor axis of the second touch sensing unit 120

122 Long axis of the second touch sensing unit 120

130 processing units

140 display area

150 first object

160 second object

Detailed ways

Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:

Please refer to FIG. 1 , which is a schematic diagram of the touch panel of the present invention. The touch panel 100 includes a first touch sensing unit 110 , a second touch sensing unit 120 , a processing unit 130 and a display area 140 .

The first touch sensing unit 110 is disposed on the first side 101 of the touch panel 100 for sensing the sliding state of the first object 150 on the first touch sensing unit 110 to generate a first sensing signal . The second touch sensing unit 120 is disposed on the second side 102 of the touch panel 100 for sensing the sliding state of the second object 160 on the second touch sensing unit 120 to generate a second sensing signal , wherein the first side 101 and the second side 102 are opposite to each other. In this embodiment, the first object 150 and the second object 160 may be, for example, the user's left thumb and right thumb, respectively.

The processing unit 130 is coupled to the first touch sensing unit 110 and the second touch sensing unit 120 for receiving and outputting corresponding operation instructions according to the first touch signal and the second touch signal. For example, the user can hold the portable electronic device with the touch panel 100 with both hands, and use the thumbs of the left and right hands (ie, the first object 150 and the second object 160) to operate the touch panel 100, so that The touch panel 100 generates corresponding operations.

In this embodiment, the display area 140 can be disposed in the center of the touch panel 100, and the first touch sensing unit 110 and the second touch sensing unit 120 can be disposed on both sides of the display area 140 (ie, touch the two sides of the control panel 100). Moreover, the first touch sensing unit 110 and the second touch sensing unit 120 may be two sensing elements attached to the touch panel 100 . Alternatively, the user can use software design to divide the touch panel 100 into the first touch sensing unit 110 and the second touch sensing unit 120 . Therefore, the user can operate the touch panel 100 with the thumbs of both hands while holding the portable electronic device with the touch panel 100 in both hands, and the display unit 140 can display the screen generated by the corresponding operation. In this way, when the user operates the touch panel 100 , the user's vision will not be blocked, so as to increase the convenience of use. In addition, the hand movement of the user's one-handed operation can also be reduced, so as to reduce the physiological damage caused by excessive use.

Hereinafter, the operation of the touch panel 100 will be further described.

When the first touch sensing unit 110 and the second touch sensing unit 120 sense the first object 150 and the second object 160 respectively along the short axis 111 of the first touch sensing unit 110 and the second touch When the short axis 121 of the control sensing unit 120 slides toward the outside of the touch panel 100 (as shown in FIG. 2 ), the corresponding operation command output by the processing unit 130 is to enlarge the screen. For example, when the user slides the thumbs of both hands on the first touch sensing unit 110 and the second touch sensing unit 120 toward the outside of the touch panel 110 , the image output by the touch panel 100 will zoom in.

When the first touch sensing unit 110 and the second touch sensing unit 120 simultaneously sense the first object 150 and the second object 160 along the first touch sensing unit 110 and the second touch sensing unit respectively When the short axis 121 of 120 slides toward the outside of the touch panel 100 (as shown in FIG. 3 ), the corresponding operation instruction output by the processing unit 130 is to zoom out the screen. For example, if the user slides the thumbs of both hands on the first touch sensing unit 110 and the second touch sensing unit 120 toward the inner side of the touch panel 110 , then the image output by the touch panel 100 will shrink.

When the first touch sensing unit 110 senses that the first object 150 slides toward the outside of the touch panel 100 along the short axis 111 of the first touch sensing unit 110 and the second touch sensing unit 120 does not sense When the second object 160 is slid (as shown in FIG. 4 ), the corresponding operation command output by the processing unit 130 is a previous screen. For example, if the user slides the thumb of the left hand on the first touch sensing unit 110 toward the outside of the touch panel 100 , the touch panel 100 will switch the original screen to the previous screen.

When the second touch sensing unit 120 senses that the second object 160 slides toward the outside of the touch panel 100 along the short axis 121 of the second touch sensing unit 120 and the first touch sensing unit 110 does not sense When the first object 150 is slid (as shown in FIG. 5 ), the corresponding operation command output by the processing unit 130 is a next page screen. For example, if the user slides the thumb of the right hand on the second touch sensing unit 120 toward the outside of the touch panel 100 , the touch panel 100 will switch the original screen to the screen of the next page.

In addition, in this embodiment, the touch panel 100 also has a third side 103 and a fourth side 104 , wherein the third side 103 and the fourth side 104 are opposite to each other. When the first touch sensing unit 110 senses that the first object 150 slides toward the third side 103 along the long axis 112 of the first touch sensing unit 110 and the second touch sensing unit 120 senses the When the two objects 160 slide toward the fourth side 104 along the long axis 122 of the second touch sensing unit 120 (as shown in FIG. 6 ), the corresponding operation command output by the processing unit 130 is to rotate the screen clockwise. For example, the user slides the thumb of the left hand along the long axis 112 of the first touch sensing unit 110 toward the third side 103 of the touch panel 100, and at the same time slides the thumb of the right hand along the second side. When the long axis 122 of the touch sensing unit 120 slides toward the fourth side 104 of the touch panel 100 , the image displayed on the touch panel 100 will rotate clockwise.

When the first touch sensing unit 110 senses that the first object 150 slides toward the fourth side 104 along the long axis 112 of the first touch sensing unit 110 and the second touch sensing unit 120 senses the When the two objects 160 slide toward the third side 103 along the long axis 122 of the second touch sensing unit 120 (as shown in FIG. 7 ), the corresponding operation instruction output by the processing unit 130 is to rotate the screen counterclockwise. For example, the user slides the thumb of the left hand along the long axis 112 of the first touch sensing unit 110 toward the fourth side 104 of the touch panel 100, and at the same time slides the thumb of the right hand along the second side. When the long axis 122 of the touch sensing unit 120 slides towards the third side 103 of the touch panel 100 , the image displayed on the touch panel 100 will rotate counterclockwise.

In addition, when the first touch sensing unit 110 senses that the first object 150 is pressed on the first touch sensing unit 110 , the corresponding operation command output by the processing unit 130 is based on the second object 160 being pressed on the second touch. the sliding direction on the control sensing unit 120 to generate a screen dragging action (please refer to FIG. 8 ), or when the second touch sensing unit 120 senses that the second object 160 touches the second touch sensor When the unit 120 is on, the corresponding operation command output by the processing unit 130 is to generate a screen dragging action according to the sliding direction of the first object 150 on the first touch sensing unit 110 (please refer to FIG. 9 ).

For example, when the user presses the thumb of the left hand on the first touch sensing unit 110, if the user places the thumb of the right hand on the second touch sensing unit 120 toward the touch panel 100, the image output by the touch panel 100 will generate a rightward image dragging action; , the image output by the touch panel 100 will generate a leftward image dragging action; , the image output by the touch panel 100 will generate an upward image dragging action; Then the image output by the touch panel 100 will generate a downward image dragging action.

On the other hand, when the user, for example, presses the thumb of the right hand on the second touch sensing unit 120, if the user, for example, places the thumb of the left hand on the first touch sensing unit 110 toward the touch panel 100, the image output by the touch panel 100 will generate a leftward image dragging action; , the image output by the touch panel 100 will generate a rightward image dragging action; , the image output by the touch panel 100 will generate an upward image dragging action; Then the image output by the touch panel 100 will generate a downward image dragging action.

From the description of the above embodiments, a touch method can be summarized. Please refer to FIG. 10 , which is a flow chart of the touch control method of the present invention. The touch method of this implementation is suitable for a touch panel, and the touch panel has a first touch sensing unit and a second touch sensing unit, wherein the first touch sensing unit and the second touch sensing unit The units are respectively located on opposite first and second sides of the touch panel. In step S1010, the sliding state of the first object and the second object on the first touch sensing unit and the sliding state of the second touch sensing unit are respectively sensed to generate a first sensing signal and a second sensing signal. sensing signal. Next, in step S1020, receiving and outputting corresponding operation instructions according to the first sensing signal and the second sensing signal.

In an embodiment, step S1020 further includes the following steps. When the first sensing signal and the second sensing signal are at the same time, the first object and the second object are respectively directed toward the touch panel along the short axis of the first touch sensing unit and the short axis of the second touch sensing unit. When an outer slide occurs, a corresponding operation instruction for zooming in the screen is output. When the first sensing signal and the second sensing signal are at the same time, the first object and the second object are respectively directed toward the touch panel along the short axis of the first touch sensing unit and the short axis of the second touch sensing unit. When an inner slide occurs, a corresponding operation command for zooming out the screen is output.

In one embodiment, step S1020 includes the following steps. When the first sensing signal is generated by the first object sliding toward the outside of the touch panel along the short axis of the first touch sensing unit, a corresponding operation instruction of the previous page is output. When the second sensing signal is generated by the second object sliding toward the outside of the touch panel along the short axis of the second touch sensing unit, a corresponding operation command of the next page is output.

In an embodiment, step S1020 further includes the following steps. When the first sensing signal is generated by the first object pressing on the first touch sensing unit, the second sensing signal generated according to the sliding direction of the second object on the second touch sensing unit, To output the corresponding operation command of the drag action on the screen. Or, when the first sensing signal is generated by the second object pressing on the second touch sensing unit, the second sensing signal generated according to the sliding direction of the first object on the first touch sensing unit The test signal is used to output the corresponding operation command of the screen dragging action.

In one embodiment, the aforementioned touch panel further has a third side and a fourth side, wherein the third side and the fourth side are opposite to each other, then step S1020 further includes the following steps. When the first sensing signal is generated when the first object slides toward the third side along the long axis of the first touch sensing unit and the second sensing signal is generated by the second object sliding along the second touch sensing unit When the long axis slides toward the fourth side, a corresponding operation command for clockwise rotation of the screen is output. When the first sensing signal is generated when the first object slides toward the fourth side along the long axis of the first touch sensing unit and the second sensing signal is generated by the second object sliding along the second touch sensing unit When the major axis slides toward the third side, a corresponding operation instruction for rotating the screen counterclockwise is output.

In the touch panel and the touch method thereof according to the embodiment of the present invention, a first touch sensing unit and a second touch sensing unit are arranged on opposite sides of the touch panel, and respectively sense the position of the first object. The sliding state on the first touch sensing unit and the sliding state of the second object on the second touch sensing unit are used to output corresponding operation signals. In this way, when the user holds the portable electronic device with the touch panel in both hands, he can directly use the thumbs held on both sides of the touch panel to operate the portable electronic device without blocking the use of the device. The user's vision to increase the convenience of use, and can reduce the hand movement of the user's one-handed operation, so as to reduce the physiological damage caused by excessive use.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (10)

1. A touch method, suitable for a touch panel, the touch panel has a first touch sensing unit and a second touch sensing unit, the first touch sensing unit and the The second touch sensing unit is respectively located on a first side and a second side opposite to the touch panel, wherein the touch method includes: respectively sensing a sliding state of a first object and a second object on the first touch sensing unit and a sliding state on the second touch sensing unit to generate a first sensing signal and a second sensing signal; and Receive and output a corresponding operation instruction according to the first sensing signal and the second sensing signal. 2. The touch control method according to claim 1, wherein the step of receiving and outputting the corresponding operation instruction according to the first sensing signal and the second sensing signal comprises: When the first sensing signal and the second sensing signal are simultaneously the first object and the second object along the short axis of the first touch sensing unit and the second touch When the short axis of the control sensing unit slides toward the outside of the touch panel, output a corresponding operation command for zooming in the screen; and When the first sensing signal and the second sensing signal are simultaneously the first object and the second object along the short axis of the first touch sensing unit and the second touch When the short axis of the control sensing unit slides toward the inner side of the touch panel, output a corresponding operation instruction of shrinking the screen. 3. The touch method according to claim 1, wherein the touch panel further has a third side and a fourth side, wherein the third side and the fourth side The sides are opposite to each other, and the step of receiving and outputting the corresponding operation instruction according to the first sensing signal and the second sensing signal includes: When the first sensing signal is generated by sliding the first object toward the third side along the long axis of the first touch sensing unit and the second sensing signal is the first When the two objects slide toward the fourth side along the long axis of the second touch sensing unit, output a corresponding operation command for rotating the screen clockwise; and When the first sensing signal is generated by sliding the first object toward the fourth side along the long axis of the first touch sensing unit and the second sensing signal is the first When the two objects slide toward the third side along the long axis of the second touch sensing unit, a corresponding operation command for rotating the screen counterclockwise is output. 4. The touch control method according to claim 1, wherein the step of receiving and outputting the corresponding operation instruction according to the first sensing signal and the second sensing signal comprises: When the first sensing signal is generated by the sliding of the first object toward the outside of the touch panel along the short axis of the first touch sensing unit, the output of the previous page of the picture is Corresponding operating instructions; and When the second sensing signal is generated by the second object sliding toward the outside of the touch panel along the short axis of the second touch sensing unit, the corresponding image of the next page is output. Operating instructions. 5. The touch control method according to claim 1, wherein the step of receiving and outputting the corresponding operation instruction according to the first sensing signal and the second sensing signal comprises: When the first sensing signal is generated by the first object pressing on the first touch sensing unit, according to the sliding of the second object on the second touch sensing unit The second sensing signal generated by the direction is used to output the corresponding operation instruction of a screen dragging action or when the second sensing signal is that the second object is pressed on the second touch sensor When generated on the touch sensing unit, output the corresponding operation of the screen dragging action according to the second sensing signal generated by the sliding direction of the first object on the first touch sensing unit instruction. 6. A touch panel, characterized in that, comprising: A first touch sensing unit, located on a first side of the touch panel, is used to sense a sliding state of a first object on the first touch sensing unit to generate a first sensing signal; A second touch sensing unit, located on a second side of the touch panel, is used to sense a sliding state of a second object on the second touch sensing unit to generate a second sensing a signal, wherein the first side and the second side are opposite each other; and A processing unit, coupled to the first touch sensing unit and the second touch sensing unit, for receiving and outputting a touch signal according to the first touch signal and the second touch signal Corresponding to the operation instruction. 7. The touch panel according to claim 6, wherein when the first touch sensing unit and the second touch sensing unit simultaneously sense the first object and the When the second object slides toward the outside or inside of the touch panel along the short axes of the first touch sensing unit and the second touch sensing unit, the corresponding output of the processing unit The operation instruction is a frame zoom-in or a frame zoom-out. 8. The touch panel according to claim 6, wherein the touch panel further has a third side and a fourth side, wherein the third side and the fourth side The sides are opposite to each other, when the first touch sensing unit senses that the first object slides toward the third side along the long axis of the first touch sensing unit and the second touch When the control sensing unit senses that the second object slides toward the fourth side along the long axis of the second touch sensing unit, the corresponding operation instruction output by the processing unit is a screen Rotate clockwise, when the first touch sensing unit senses that the first object slides toward the fourth side along the long axis of the first touch sensing unit and the second touch When the control sensing unit senses that the second object slides toward the third side along the long axis of the second touch sensing unit, the corresponding operation instruction output by the processing unit is a screen Turn counterclockwise. 9. The touch panel according to claim 6, wherein when the first touch sensing unit senses that the first object is along the short axis of the first touch sensing unit When sliding toward the outside of the touch panel and the second touch sensing unit does not sense the sliding of the second object, the corresponding operation command output by the processing unit is a previous page, when The second touch sensing unit senses that the second object slides toward the outside of the touch panel along the short axis of the second touch sensing unit and the first touch sensing unit When the sliding of the first object is not sensed, the corresponding operation instruction output by the processing unit is a next-page picture. 10. The touch panel according to claim 6, wherein when the first touch sensing unit senses that the first object is pressed on the first touch sensing unit The corresponding operation instruction output by the processing unit is to generate a screen dragging action according to the sliding direction of the second object on the second touch sensing unit, or when the second touch sensing unit When the detection unit senses that the second object is pressed on the second touch sensing unit, the corresponding operation instruction output by the processing unit is based on the first object being touched by the first touch The sliding direction on the sensing unit is used to generate the screen dragging action.

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