Patent Publication Number: US-2013249856-A1

Title: Touch device and touch sensing method thereof

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a touch device and a touch sensing method of the touch device, and more particularly to a touch device including an object detecting device disposed outside a touch sensing region, and a touch sensing method of the touch device. 
     2. Description of the Prior Art 
     Recently, touch panels are widely applied in the consumer electronic products, and various touch sensing methods are utilized in the touch panels. The capacitive touch panel has the advantages of high accuracy, multi-touch function and high touch resolution; which is why the capacitive touch panel is now prominently used in the field of touch technologies. 
     In the conventional capacitive touch panel, two sets of axis sensing units crossed and arranged along different axes are disposed inside. As the scanning method of the touch sensing method is performed, driving signals provided by the controller integrated circuit (controller IC) are delivered to a set of axis sensing units, and another set of axis sensing units is used to sense and obtain the detecting signals. Furthermore, the variations of the detecting signals are calculated to determine the position of touch point. Accordingly, the number of the axis sensing units positively relates to the touch resolution, in other words, increasing the number of the axis sensing units can improve the touch resolution. Conversely, increasing the number of the axis sensing units to be controlled and enabled may require more power for the controller IC, and increase the cost of the controller IC and the overall electricity dissipation. Similarly, to sustain the equivalent touch resolution for the large size touch panels, the number of the axis sensing units increase with the enlargement of touch panel size, thereby increasing the power consumption of the controller IC and deteriorating the report rate and not meeting the requirements; in this way the touch sensing efficiency is further adversely affected. 
     SUMMARY OF THE INVENTION 
     An objective of the present invention is therefore to provide a touch device and a touch sensing method of the touch device. The touch device includes an object detecting device disposed outside a touch sensing region to detect the movement of the external objects and determine which part of the touch sensing region may be touched in advance, and deciding if the touch sensing structure in the touch sensing region should be enabled. Furthermore, the method of partially turning on the touch sensing structure can lower down the power consumption for driving the controller IC and increase the report rate of the touch device. 
     According to one exemplary embodiment of the present invention, a touch device having a touch sensing region is provided. The touch device includes a touch sensing structure and at least one object detecting device. The touch sensing structure is disposed in the touch sensing region of the touch device. The touch sensing region is divided into a plurality of sub sensing regions, and includes a plurality of sensing units for providing a function of positioning touch points. The object detecting device is disposed outside the touch sensing region, and the object detecting device is employed to detect whether an object is getting close to the touch device and determine which one of the sub sensing regions is going to be touched by said object, in order to further enable the sensing units within the enabled sub sensing region that is going to be touched by the object. 
     According to another exemplary embodiment of the present invention, a touch sensing method of a touch device includes the following steps. First, a touch device having a touch sensing region is provided. The touch device includes a touch sensing structure and at least one object detecting device. The touch sensing region of the touch device is divided into a plurality of sub sensing regions, and the touch sensing structure includes a plurality of sensing units for providing a function of positioning touch points. The object detecting device is disposed outside the touch sensing region. Subsequently, if an object getting close to the touch device is detected by the object detecting device. Furthermore, the sub sensing region that is going to be touched by the object is determined with the object detecting device, and the sensing units within the enabled sub sensing region which is going to be touched by the object are enabled. 
     These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram illustrating a touch device according to the first exemplary embodiment of the present invention. 
         FIG. 2  is a three-dimensional schematic diagram illustrating an operation of a touch device according to the first exemplary embodiment of the present invention. 
         FIG. 3  is a flow chart illustrating a touch sensing method of a touch device according to the first exemplary embodiment of the present invention. 
         FIG. 4  is a schematic diagram illustrating the signal delivering pathway of a touch device according to the first exemplary embodiment of the present invention. 
         FIG. 5  is a flow chart illustrating a touch sensing method of a touch device according to another exemplary embodiment of the present invention. 
         FIG. 6  is a flow chart illustrating a touch sensing method of a touch device according to the other exemplary embodiment of the present invention. 
         FIG. 7  is a schematic diagram illustrating a touch device according to the second exemplary embodiment of the present invention. 
         FIG. 8  is a three-dimensional schematic diagram illustrating an operation of a touch device according to the second exemplary embodiment of the present invention. 
         FIG. 9  is a schematic diagram illustrating a touch device according to the third exemplary embodiment of the present invention. 
         FIG. 10  is a schematic diagram illustrating a touch device according to the fourth exemplary embodiment of the present invention. 
         FIG. 11  is a schematic diagram illustrating a touch device according to the fifth exemplary embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     To provide a better understanding of the present invention, preferred exemplary embodiments will be described in detail herein. The preferred exemplary embodiments of the present invention are illustrated in the accompanying drawings with numbered elements. 
     Please refer to  FIG. 1  and  FIG. 2 .  FIG. 1  is a schematic diagram illustrating a touch device according to the first exemplary embodiment of the present invention.  FIG. 2  is a three-dimensional schematic diagram illustrating an operation of a touch device according to the first exemplary embodiment of the present invention. The drawings are schematic diagrams to help understanding the present invention, and the real scale can be adjusted, based on the design requirements. As shown in  FIG. 1  and  FIG. 2 , in this exemplary embodiment, a touch device  100  having a touch sensing region  120  is provided. The touch device  100  includes a touch sensing structure  110  and an object detecting device  130 . The touch sensing structure  110  is disposed in the touch sensing region  120  of the touch device  100 . Furthermore, the touch sensing region  120  is divided into a plurality of sub sensing regions  121 , and the touch sensing structure  110  includes a plurality of sensing units  111  to provide a function of positioning touch points. The object detecting device  130  is disposed outside the touch sensing region  120  of the touch device  100 . Furthermore, the object detecting device  130  is employed to detect objects getting close to the touch device  100  and to determine which one of the sub sensing regions  121  is going to be touched by the object in order to enable the sensing units  111  within the sub sensing region  121  that is going to be touched by the object. The sensing units  111  include a plurality of first axis sensing units R and a plurality of second axis sensing units C, but not limited thereto. In other words, the object detecting device  130  is employed to detect objects getting close to the touch device  100  and to determine which one of the sub sensing regions  121  is going to be touched by the object in order to enable the first axis sensing units R and the second axis sensing units C within the sub sensing regions  121  that are going to be touched by the object. 
     In this exemplary embodiment, the touch sensing structure  110  preferably includes a capacitive touch sensing structure or an optical touch sensing structure, but not limited thereto. Moreover, the touch sensing structure  110  of this exemplary embodiment includes the first axis sensing units R 1 /R 2 /R 3 /R 4 /R 5 /R 6  and the second axis sensing units C 1 /C 2 /C 3 /C 4 /C 5 /C 6 . Each of the first axis sensing units R extends along a first direction X, and each of the second axis sensing units C extends along a second direction Y. The first direction X is preferably perpendicular to the second direction Y, but not limited thereto. The first axis sensing units R and the second axis sensing units C are cross-disposed, so that when a touch event happens, the variations of the sensing signals of the first axis sensing units R and the second axis sensing units C are calculated to determine the position of the touch point. More specifically, when the touch sensing structure  110  is overall enabled, pulse driving signals are delivered to each of the first axis sensing units R sequentially, and sensing signals provided by each of the second axis sensing units C are collected to detect an electrical change such as the variations of capacitance of the touch point. The position of the touch point can therefore be further calculated and determined. In other words, the touch sensing structure  110  could be a matrix touch sensing structure, but not limited thereto. In this exemplary embodiment, the part of the touch sensing region  121  that is going to be touched is firstly determined by the object detecting device  130 , and the touch sensing structure  110  is partially enabled. That is to say, in this exemplary embodiment, only the first axis sensing units R and the second axis sensing units C within the sub sensing region  121  that is going to be touched are enabled, and the sub sensing region  121  that is going to be touched is determined by the object detecting device  130 . Accordingly, the frequency of turning on the first axis sensing units R and the second axis sensing units C can be reduced to decrease the power consumption. Additionally, the sensing method as illustrated could be regarded as a mutual capacitance sensing methods, but not limited thereto. 
     Furthermore, as shown in  FIG. 1 , the sub sensing regions  121  are arranged as a m*n matrix, m and n are respectively a natural number, and at least one of m and n is substantially larger than or equal to 2. In this exemplary embodiment, the touch sensing region  120  is divided into four sub sensing regions  121  including a sub sensing region  121 A, a sub sensing region  121 B, a sub sensing region  121 C and a sub sensing region  121 D, and the four sub sensing regions  121  are arranged as a 2*2 matrix. The number and the disposition of the sub sensing regions  121  of the touch sensing structure  110  are not limited, which could be adjusted based on the design demand. Additionally, each of the sub sensing regions  121  includes at least one region wherein at least one of the first axis sensing units R and at least one of the second axis sensing units C cross each other to provide each of the sub sensing regions  121  with a function of positioning touch points. Moreover, the object detecting device  130  may include an ultrasonic object detecting device or an image object detecting device or other proper apparatuses for detecting objects getting close to the touch device  100 . The object detecting device  130  can be used to detect one or a plurality of objects getting close to the touch device  100 . 
     Please refer to  FIG. 3  and  FIG. 4 , and refer to  FIG. 1  and  FIG. 2  together.  FIG. 3  is a flow chart illustrating a touch sensing method of a touch device according to the first exemplary embodiment of the present invention.  FIG. 4  is a schematic diagram illustrating the signal delivering pathway of a touch device according to the first exemplary embodiment of the present invention. As shown in  FIG. 1  and  FIG. 3 , a touch sensing method of a touch device is provided in the present invention, and the touch sensing method includes the following steps. At first, the touch device  100  as illustrated above is provided, as shown in step S 110 . Subsequently, as shown in step S 120 , the object detecting device  130  is used to detected whether an object getting close to the touch device  100 . If the detection result shows no object getting close to the touch device  100 , step S 132  would be performed, i.e. the touch device  100  would not be enabled. Conversely, if the detection result shows an object getting close to the touch device  100 , step S 131  would be performed, i.e. the sub sensing regions  121  that is going to be touched by the object is further enabled by the object detecting device  130 . Then, step S 140  is performed. According to the data about the enabled sub sensing region  121  by the object detecting device  130 , the sensing units  111  within the enabled sub sensing region  121  which is going to be touched by the object are enabled. In other words, according to the data about the enabled sub sensing regions  121  by the object detecting device  130 , the first axis sensing units R and the second axis sensing units C within the enabled sub sensing region  121  which is going to be touched by the object are enabled. For example, as shown in  FIG. 1  and  FIG. 2 , as an object OB 1  gets close to the touch device  100 , the object detecting device  130  could determine that the sub sensing region  121 C is going to be touched by the object OB 1 , accordingly, only the first axis sensing units R 4 /R 5 /R 6  and the second axis sensing units C 1 /C 2 /C 3  within the sub sensing region  121 C are enabled, and other first axis sensing units R and other second axis sensing units C may not be enabled. Accordingly, the scanning frequency of the first axis sensing units R can be reduced for decreasing power consumption. Moreover, if the detection result of the object detecting device  130  shows no object getting close to the touch device  100 , the touch sensing structure  110  could be in a mode of saving power in order to save the electricity consumption of the touch device  100 . 
     As shown in  FIG. 1 ,  FIG. 2  and  FIG. 4 , the touch device  100  further includes a controller  180 , and the controller  180  is respectively and electrically connected to the touch sensing structure  110  and the object detecting device  130 . The controller  180  is used to divide the touch sensing region  120  into the sub sensing regions  121  and enabling the first axis sensing units R and the second axis sensing units C within each of the sub sensing regions  121 . In other words, the controller  180  can be used to define the distribution status of the sub sensing regions  121 . For example, the controller  180  could be used to divide the touch sensing region  120  into the sub sensing regions  121  arranged as a m*n matrix, wherein m and n are natural numbers, and at least one of the two among m and n is substantially larger than or equal to 2. In this exemplary embodiment, the controller  180  divides the touch sensing region  120  into four sub sensing regions  121  including the sub sensing region  121 A, the sub sensing region  121 B, the sub sensing region  121 C and the sub sensing region  121 D, i.e. the controller  180  divides the touch sensing region  120  into the sub sensing regions  121  arranged as a 2*2 matrix. The controller  180  is preferably a controller IC, but not limited thereto. The controller  180  could be used to deliver a detection driving signal TX 1  to the object detecting device  130  to perform the object detection. Then, the object detecting device  130  may deliver back an object detecting signal RX 1  to the controller  180 , the controller  180  may further determine whether a touch driving signal TX 2  should be delivered to the touch sensing structure  110  so as to partially enable the touch sensing structure  110 . In other words, the controller  180  may be used to receive the object detecting signal RX 1  from the object detecting device  130  and further enables the first axis sensing units R and the second axis sensing units C within one of the sub sensing regions  121 . That is to say, the touch driving signal TX 2  could be used to only enable the sensing units  111  within the sub sensing region  121  that the object OB 1  gets close to, and other sensing units  111  would not be enabled. More specifically, the touch driving signal TX 2  could be used to enable the first axis sensing units R 4 /R 5 /R 6  and the second axis sensing units C 1 /C 2 /C 3  within the sub sensing region  121 C that the object OB 1  gets close to, the variations in the sensing signals of the second axis sensing units C 1 /C 2 /C 3  are used to determine the position of the touch point, and a touch sensing signal RX 2  is delivered back to the controller  180  and a display controller  191  of a display panel  190  for displaying the result of the detection without turning other first axis sensing units R and other second axis sensing units C. In other words, the signals delivered back to the controller  180  for determining whether an object gets close to the touch device  100  could also be used to switch the display panel  190  to a display mode or keep the display panel  190  in a resting mode, which is beneficial for saving power consumption of the touch display panel. 
     It is appreciated that, in this exemplary embodiment, at first, the object detecting device  130  is employed to detect whether an object is getting close to the touch device  100  and to determined which one of the sub sensing regions  121  is going to be touched by the object. Subsequently, whether the touch sensing structure  110  should be enabled or not is determined, and how to partially enable the touch sensing structure  110  is calculated. Accordingly, the number of the first axis sensing units R and the second axis sensing units C enabled by the controller  180  can be reduced, and the scanning frequency of the first axis sensing units R can be reduced so as to decrease power consumption of the controller  180 . Moreover, with such utilization of the touch sensing method of the touch device provided in the present invention, the report rate of the touch device  100  could be increased, thereby improving the performance of the touch device  100 . 
     Please refer to  FIG. 5 , and refer to  FIG. 2  together.  FIG. 5  is a flow chart illustrating a touch sensing method of a touch device according to another exemplary embodiment of the present invention. As shown in  FIG. 5 , compared to the first exemplary embodiment as illustrated above, the touch sensing method further includes performing a step S 121  before the step S 131 . During the step S 121 , whether the object OB 1  getting close to the touch device  100  is an effective object or not is first judged by the object detecting device  130  to determine if the object detecting device  130  should be used to determine which sub sensing regions  121  is going to be touched by the object OB 1 . In other words, the use of the object detecting device  130  can dismiss non-effective objects such as wrists, elbows and other objects causing mis-touch, in order to prevent misjudgment and reduce unnecessary movements. The object detecting device  130  may be used to judge whether the object is a non-effective object or not by considering the area or the volume of the object OB 1 . For example, if the effective object OB 1  is a touch pen having a predetermined area or volume, accordingly, as a new object such as a wrist gets close to the sub sensing regions  121 , the detecting device  130  can detect that the area or volume of the new object is larger than the predetermined area or volume of the effective object OB 1 , and further assume that the new object is a non-effective object. The standard of judging effective objects could be adjusted by modifying the setting of the detecting device  130  according to various demands of touch applications. In this exemplary embodiment, the touch sensing method is similar to the touch sensing method illustrated in the first exemplary embodiment, except for the step S 121 , and the similarities including other steps and operation status are omitted herein for brevity. 
     Please refer to  FIG. 6 , and refer to  FIG. 1  and  FIG. 2  together.  FIG. 6  is a flow chart illustrating a touch sensing method of a touch device according to the other exemplary embodiment of the present invention. As shown in  FIG. 6 , compared to the exemplary embodiment as illustrated above, the touch sensing method further includes performing a step S 150 , and the step S 150  is performed to detect a distance D between the touch device  100  and the object OB 1  getting close to the touch device  100  by the object detecting device  130 . In other words, in this exemplary embodiment, the object detecting device  130  can be used to judge the variation of the relative condition between the object OB 1  and the touch device  100  along a third direction Z, accompanied with the original function of determining the planar position of the touch point along the first direction X and the second direction Y. The touch device  100  may have the function of determining a three-dimensional position of the touch point. In this exemplary embodiment, the touch sensing method is similar to the touch sensing method illustrated above, except for the step S 150 , and the similarities including other steps and operation status are omitted herein for brevity. 
     Please refer to  FIG. 7  and  FIG. 8 .  FIG. 7  is a schematic diagram illustrating a touch device according to the second exemplary embodiment of the present invention.  FIG. 8  is a three-dimensional schematic diagram illustrating an operation of a touch device according to the second exemplary embodiment of the present invention. As shown in  FIG. 7  and  FIG. 8 , a touch device  200  including a touch sensing structure  210  and two object detecting devices  230  is provided, and the touch sensing structure  210  is disposed in a touch sensing region  220  of the touch device  200 . The touch sensing structure  210  includes a plurality of sensing units  221 , and the sensing units  221  includes a plurality of first axis sensing units R 1 /R 2 /R 3 /R 4 /R 5 /R 6  and a plurality of second axis sensing units C 1 /C 2 /C 3 /C 4 /C 5 /C 6 /C 7 /C 8 /C 9 /C 10 . The object detecting devices  230  are disposed outside the touch sensing region  220  of the touch device  200 . The touch sensing region  220  is divided into sub sensing regions  221  including a sub sensing region  221 A, a sub sensing region  221 B, a sub sensing region  221 C, a sub sensing region  221 D a sub sensing region  221 E, a sub sensing region  221 F, a sub sensing region  221 G and a sub sensing region  221 H. It is appreciated that, in this exemplary embodiment, two object detecting devices  230  are disposed in the touch device  200  to increase the range and the precision of the detection, but not limited thereto. In the other exemplary embodiments, the type, the number and the disposition of object detecting devices could be adjusted according to the detection range of each of the object detecting devices and the size of the touch device in order to obtain proper object detection performances. As shown in  FIG. 7  and  FIG. 8 , as an object OB 2  and an object OB 3  get close to the touch device  200 , the object detecting device  230  could determine that the sub sensing region  221 C and the sub sensing region  221 F are going to be touched by the object OB 2  and an object OB 3  respectively, and only the first axis sensing units R 1 /R 2 /R 3 /R 4 /R 5 /R 6  and the second axis sensing units C 4 /C 5 /C 6 /C 7 /C 8  within the sub sensing region  221 C and the sub sensing region  221 F are enabled, while other second axis sensing units C may not be enabled. Accordingly, the power consumption could be reduced. The characteristics of each of the other components, the operation principle, and the touch sensing methods are similar to that of the first exemplary embodiment as illustrated above, except for the number of object detecting devices  230 , the distribution status of sub sensing regions  220 , and the total number of first axis sensing units and second axis sensing units. The similarities are therefore omitted herein for brevity. It is appreciated that, in the other exemplary embodiments, the number of sub sensing regions and the distribution status of sub sensing regions in the touch sensing region could be adjusted according to the size of the touch device, the touch resolution, the number and the detection range of each of the object detecting devices for obtaining proper touch sensing performance. 
     Please refer to  FIG. 9 .  FIG. 9  is a schematic diagram illustrating a touch device according to the third exemplary embodiment of the present invention. As shown in  FIG. 9 , in this exemplary embodiment, a touch device  300  includes a touch sensing structure  310  and the object detecting device  130 . The touch sensing structure  310  includes a plurality of sensing units  311 , and the sensing units  311  includes a plurality of first axis sensing units IRX and a plurality of second axis sensing units IRY for providing a function of positioning touch points. More specifically, the touch sensing structure  310  includes the first axis sensing units IRX 1 /IRX 2 /IRX 3 /IRX 4 /IRX 5 /IRX 6  and the second axis sensing units IRY 1 /IRY 2 /IRY 3 /IRY 4 /IRY 5  disposed to cross each other. It is appreciated that each of the first axis sensing units IRX may include a transmitter XA and a receiver XB, and each of the second axis sensing units IRY may include a transmitter YA and a receiver YB. Each of the transmitters XA and each of the transmitters YA are respectively used to transmit light such as infrared light, and each of the receivers XB and each of the receivers YB are respectively used to receive light signals. Accordingly, as the touch device  300  is going to be touched, the change of the light signals caused by the touch points can be detected and the function of positioning touch points can be achieved. In other words, the touch sensing structure  310  may be an optical touch sensing structure, but not limited thereto. In this exemplary embodiment, the characteristics of each of the other components, the operation principle, and the touch sensing methods are similar to that of the first exemplary embodiment as illustrated above, except for the touch sensing structure  310  of the touch device  300 , and the similarities are therefore omitted herein for brevity. 
     Please refer to  FIG. 10 .  FIG. 10  is a schematic diagram illustrating a touch device according to the fourth exemplary embodiment of the present invention. As shown in  FIG. 10 , in this exemplary embodiment, a touch device  400  having a touch sensing region  420  includes a touch sensing structure  410  and the object detecting device  130 . The touch sensing structure  410  is disposed in the touch sensing region  420  of the touch device  400 . Furthermore, the touch sensing region  420  is divided into a plurality of sub sensing regions  421 , and the touch sensing structure  410  includes a plurality of sensing units  411  for providing a function of positioning touch points. The touch device  400  of this exemplary embodiment different from the touch device  100  of the first exemplary embodiment includes the sensing units  411  which are preferably disposed uniformly in the touch sensing structure  410  and do not cross each other. The touch sensing structure  410  further includes a plurality of conducting lines  412  respectively connected to each of the sensing units  411 , and each of the conducting lines  412  is used to deliver signals to each of the corresponding sensing units  411  in order to position the touch points. In the touch device  400  of this exemplary embodiment, only the sensing units  411  within the sub sensing region  421  that is selected according to the detection result of the object detecting device  130  are enabled without turning on the other sensing units  411 . The touch sensing structure  410  could be enabled based on a self-capacitance sensing method preferably, but not limited thereto. Additionally, the shape of the sensing units  411  preferably includes a triangle shape, and the shape of sensing units  411  could be changed to other proper shapes according to the requirements. The sub sensing regions  421  are preferably disposed along the second direction Y in coordination with the sensing units  411 , but not limited thereto. In the touch device  400  of this exemplary embodiment, the characteristics of each of the other components, the operation principle, and the touch sensing methods are similar to those of the first exemplary embodiment as illustrated above, except for the touch sensing structure  410  and the distribution status of the sub sensing regions  421 , and the similarities are therefore omitted herein for brevity. 
     Please refer to  FIG. 11 .  FIG. 11  is a schematic diagram illustrating a touch device according to the fifth exemplary embodiment of the present invention. As shown in  FIG. 11 , in this exemplary embodiment, a touch device  500  having the touch sensing region  120  includes a touch sensing structure  510  and the object detecting device  130 . The touch sensing structure  510  is disposed in the touch sensing region  120  of the touch device  500 , and the touch sensing region  120  is divided into a plurality of sub sensing regions  121 . Furthermore, the touch sensing structure  510  includes a plurality of sensing units  511  for providing a function of positioning touch points. The touch device  500  of this exemplary embodiment different from the touch device  100  of the first exemplary embodiment includes the sensing units  511  which are preferably disposed uniformly in the touch sensing structure  510  and do not cross each other. The touch sensing structure  510  further includes a plurality of conducting lines  512  respectively connected to each of the sensing units  511 , and each of the conducting lines  512  is used to deliver signals to each of the corresponding sensing units  511  in order to positioning the touch points. In the touch device  500  of this exemplary embodiment, only the sensing units  511  within the sub sensing region  121  that is selected according to the detection result of the object detecting device  130  are enabled without turning on the other sensing units  511 . The touch sensing structure  510  could be enabled based on a self-capacitance sensing method preferably, but not limited thereto. Additionally, the shape of sensing units  511  preferably includes a rectangular shape, and the shape of sensing units  511  could be changed into other proper shapes according to the requirements. In the touch device  500  of this exemplary embodiment, the characteristics of each of the other components, the operation principle, and the touch sensing methods are similar to that of the fourth exemplary embodiment as illustrated above, except for the touch sensing structure  510 , and the similarities are therefore omitted herein for brevity. 
     In conclusion, the touch device of the present invention includes an object detecting device used to detect whether external object gets close or touches the touch device, and determines whether the touch sensing structure in the touch sensing region should be enabled or not. Accordingly, when there is no object getting close to the touch device, the touch sensing structure could be maintained in an electricity saving mode. Furthermore, the object detecting device can also be used to determine which sub sensing region is going to be touched by the object so as to only partially enable the touch sensing structure. Consequently, the power consumption for driving the controller IC can be reduced and the report rate of the touch device can be increased. 
     Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.