Abstract:
A touch-sensitive module is provided. The touch-sensitive module includes at least one first sub-unit. The first sub-unit includes a first sensor pad, a second sensor pad and a wrapper. The second sensor pad has a first portion and a second portion separated from each other. The first sensor pad passes through a gap between the first portion and the second portion of the first sensor pad. Two ends of a wire are electrically connected to the first portion and the second portion of the first sensor pad, respectively. The wrapper covers the first sensor pad and the second sensor pad. A first lead and a second lead connected to the first sensor pad protrude from the wrapper. A third lead and a fourth lead connected to the second sensor pad protrude from the wrapper.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    The present application is a continuation application claiming benefit from a pending U.S. patent application bearing a Ser. No. 14/623,727 and filed Feb. 17, 2015, contents of which are incorporated herein for reference. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present disclosure relates to a wireless control system, and particularly to a touch-sensitive module used in the wireless control system and a manufacturing method of the touch-sensitive module. 
       BACKGROUND OF THE INVENTION 
       [0003]    Gesture sensing/touch sensing technology has been widely used in 2D or 3D control field and applied to household appliances and industrial equipments. For example, the technology is applied to TV remote controllers, touch screens, keyboards and in-vehicle control interfaces. 
         [0004]    In a control device with gesture sensing/touch sensing function, a touch-sensitive module is configured to only receive data input. The received data should be processed and then emitted through a signal transmitting unit. Since more and more kinds of data input are utilized to achieve intuitive control, the quantity of the touch-sensitive modules rapidly increase and coupling between the touch-sensitive modules and circuits/elements in the control device becomes much complicated. Therefore, a novel touch-sensitive module with the advantage of easy manufacturing process and simple coupling method is desired. 
       SUMMARY OF THE INVENTION 
       [0005]    An aspect of the present disclosure provides a touch-sensitive module including at least one first sub-unit. The first sub-unit includes a first sensor pad, a second sensor pad and a wrapper. The second sensor pad has a first portion and a second portion separated from each other. The first sensor pad passes through a gap between the first portion and the second portion of the first sensor pad. Two ends of a wire are electrically connected to the first portion and the second portion of the first sensor pad, respectively. The wrapper covers the first sensor pad and the second sensor pad. A first lead and a second lead connected to the first sensor pad protrude from the wrapper. A third lead and a fourth lead connected to the second sensor pad protrude from the wrapper. 
         [0006]    In an embodiment, the touch-sensitive module further includes a second sub-unit having the same shape and structure as the first sub-unit. When the first sub-unit and the second sub-unit are combined together, the first lead of the first sub-unit is electrically connected to the second lead of the second sub-unit. The third lead of the first sub-unit is electrically connected to the fourth lead of the second sub-unit. 
         [0007]    In an embodiment, the first sensor pad, the second sensor pad, the first lead, the second lead, the third lead and the fourth lead form a planner structure and are integrally formed with a main frame by a metal stamping process. The wire is electrically connected to the first portion and the second portion of the first sensor pad via wire bonding. 
         [0008]    In an embodiment, the first sensor pad and the second sensor pad form a planner structure and are integrally formed with a lead frame by a metal stamping process, the wire being electrically connected to the first portion and the second portion of the first sensor pad via wire bonding. 
         [0009]    In an embodiment, the wrapper is formed by injection molding and cutting process to expose portions of the first lead, the second lead, the third lead and the fourth lead. 
         [0010]    In an embodiment, the touch-sensitive module further includes a processing chip disposed on the first sensor pad or the second sensor pad, disposed in a hallow portion of the first sensor pad or the second sensor pad, or disposed between the first sensor pad and the second sensor pad. The processing chip transmits or receives an electrical signal to at least one of the first sensor pad and the second sensor pad through at least one of the first lead, the second lead, the third lead and the fourth lead. 
         [0011]    In an embodiment, the touch-sensitive module further includes a circuit chip disposed between the first sensor pad and the second sensor pad. There are wires, each of which is electrically connected to the circuit chip and one of the first sensor pad and the second sensor pad. 
         [0012]    In an embodiment, the first sensor pad and the second sensor pad are made of a flexible material. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]    The advantages of the present disclosure will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed description and accompanying drawings, in which: 
           [0014]      FIG. 1  is a schematic diagram illustrating a wireless control system; 
           [0015]      FIG. 2  is a schematic diagram illustrating a structure of a capacitive touch-sensitive module according to an embodiment of the present invention; 
           [0016]      FIG. 3  is a schematic diagram illustrating a capacitive touch-sensitive pad structure including a lead frame according to an embodiment of the present invention; 
           [0017]      FIG. 4A  is a top view illustrating a capacitive touch-sensitive pad structure including a lead frame according to another embodiment of the present invention; 
           [0018]      FIG. 4B  is a cross-sectional side view of a capacitive touch-sensitive module manufactured from the capacitive touch-sensitive pad structure of  FIG. 4A ; 
           [0019]      FIG. 5  is a side view of a capacitive touch-sensitive module having a LED unit according to a further embodiment of the present invention; 
           [0020]      FIG. 6  is a perspective view illustrating an input device having the touch-sensitive module; 
           [0021]      FIG. 7  is a schematic diagram illustrating a button of a keypad having the touch-sensitive module; 
           [0022]      FIGS. 8A-8C  are top views illustrating capacitive touch-sensitive pad structures according to further embodiments of the present invention; and 
           [0023]      FIG. 9  is a schematic diagram illustrating a touch-sensitive module with fingerprint authentication function according to the present disclosure. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0024]    The present disclosure will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of preferred embodiments of this invention are presented herein for purpose of illustration and description only. It is not intended to be exhaustive or to be limited to the precise form disclosed. 
         [0025]    Please refer to  FIG. 1 , a schematic diagram illustrating a wireless control system. The wireless control system  10  at least includes a remote controller  100  and a controlled device  150 . The controlled device  150  includes a sensing module  152  which can handshake with the remote controller  100  to establish a communication channel therebetween. Therefore, the remote controller  100  can issue control signals to control the controlled device  150 . The remote controller  100  may further include a touch-sensitive module  130  for sensing touch actions/gestures of the user and transforming the sensed touch actions/gestures into remote control signals for operating a user interface (not shown) of the controlled device  150 . To be specific, the touch-sensitive module  130  is a capacitive touch-sensitive module. 
         [0026]    The structure of a capacitive touch-sensitive module is shown in  FIG. 2 . The capacitive touch-sensitive module  130  includes several sensor pads. In this embodiment, there are a first sensor pad  21  and six second sensor pads  22  surrounding the first sensor pad  21 . It is to be noted that the shape, the number and the relative positions of the sensor pads  21  and  22  are not limited to this embodiment and any proper modification to them are involved in the present disclosure. The layout of the sensor pads  21  and  22  is arranged in a one-dimensional mode. The sensor pads  21  and  22  are electrically isolated from each other. For each sensor pad  21  or  22 , capacitance changes with approaching of a touch object such as a finger. Electrical signals generated by the sensor pads  21  and  22  are transmitted to a processing chip (not shown) through corresponding leads  20 , respectively. The capacitive touch-sensing module  130  and the processing chip are covered and protected by a wrapper  31 . The processing chip can determine user touch actions/gestures from position(s)/position change of the touch object by certain operation. Therefore, user touch actions/gestures near the sensor pads  21  and  22  can be sensed to generate control signals for operating the user interface of the controlled device  150 . The detailed description can be read from patent applications of TW 201415334, US 2014/0097857 and US 2014/0097885, which are incorporated herein for reference. 
         [0027]    To simplify the manufacturing method of the one-dimensional capacitive touch-sensitive module, a lead frame is used. A touch-sensitive pad structure which can be considered as a semiproduct of the touch-sensitive module  130  is shown in  FIG. 3 . The sensor pads  21  and  22  are connected to a lead frame  30  respectively. The lead frame  30  includes a main frame  301  and several frame branches  302 . Each frame branch  302  has a first end  3021  and a second end  3022  wherein the first end  3021  and the second end  3022  are connected to only one sensor pad ( 21  or  22 ) and the main frame  301 , respectively. The main frame  301  and the frame branches  302  of the lead frame  30  together with the sensor pads  21  and  22  form a planar structure and can be easily manufactured by a metal stamping process to provide an integrally-formed product. If narrow line width is required, an etching method is applicable. The material of the touch-sensitive pad structure may be metal, conductive polymer, conductive rubber or other conductive material which can be processed by stamping or etching. A flexible material, e.g. the conductive rubber, is a better choice among these materials. In an alternative embodiment, the touch-sensitive pad structure may be formed by covering nonconductive material with conductive material, for example, plastic body electroplated with metal layer. Then, the whole structure except the main frame  301  is covered by a wrapper  31  to fix and protect the sensor pads  21  and  22 . In an embodiment, the wrapping procedure is performed by injection molding, and then the main frame  301  is removed by cutting along the dotted line. Thus, the capacitive touch-sensitive module of  FIG. 2  is obtained. The touch surface of the wrapper  31  may be a plat surface or a curved surface, and the wrapper  31  is made of an insulating material. The material of the wrapper  31  may be transparent, translucent or opaque. The leads  20  (formed from the frame branches  302 ) of the touch-sensitive module  130  protrude from the wrapper  31 . The leads  20  are electrically connected to a ribbon cable (not shown) so that the electrical signals generated by the sensor pads  21  and  22  can be transmitted to other circuits or elements through the leads  20  and the ribbon cable. Therefore, a touch control module (not shown) cooperated with the touch-sensitive module  130  can be electrically connected to the leads  20  through suitable signal lines to determine the sensed gestures/touch actions by certain operation of the electrical signals from the touch-sensitive module  130 . 
         [0028]    Please refer to  FIG. 4A  and  FIG. 4B  illustrating another embodiment of the present invention. In this embodiment, the processing chip  40  is integrated in the touch-sensitive module  130 . There is a hollow portion  210  in the first sensor pad  21  for accommodating the processing chip  40 . The sensor pads  21  and  22 , the lead frame  30  and the processing chip  40  are disposed on a substrate  41  ( FIG. 4B ). The leads  20  (formed from the lead branches  302 ) are electrically connected to the processing chip  40  via wire bonding, while the processing chip  40  is also electrically connected to pins  49  via wire bonding. The substrate  41  may be implemented by a heat sink. In addition, the substrate  41  may include a metal layer (not shown) to serve as a ground plane to shield against electrical noise and interference. Furthermore, a driving voltage may be supplied on the sensor pads  21  and  22  via the metal layer to increase sensitivity and sensible distance of the touch-sensitive module  130 . As described in the above embodiment, the lead frame  30  may be integrally formed by a metal stamping process. The wrapper  31  is formed to cover the whole structure except the main frame  301 , i.e. covering the sensor pads  21  and  22 , the frame branches  302 , the processing chip  40  and the substrate  41 . For example, the wrapping procedure is performed by injection molding, and then the main frame  301  is removed by cutting the whole structure along the dotted circle. The touch surface of the wrapper  31  may be a plat surface or a curved surface, and the wrapper  31  is made of an insulating material. The material of the wrapper  31  may be transparent, translucent or opaque. In another embodiment, the processing chip  40  may be disposed between two of the sensor pads  21  and  22 . In a further embodiment, the processing chip  40  may be disposed on one of the surfaces of the sensor pads  21  and  22 . Under this condition, an insulating layer (not shown) is interposed between the processing chip  40  and the underlying sensor pad  21  or  22 , or pins of the processing chip  40  are electrically connected to the underlying sensor pad  21  or  22 . In addition to the processing chip  40 , a battery, a wireless communication chip or other circuit chip which is required for the remote controller  100  may be disposed in and integrated into the touch-sensitive module  130  in the same manner. The circuit chip is wrapped together with the sensor pads  21  and  22  and the leads  20 . 
         [0029]    According to the present disclosure, the touch-sensitive module has limited sensor pads. The concept of the present disclosure is breaking up the whole into parts. The size of the remote controller  100  can be greatly reduced, e.g. like a button. Therefore, the present disclosure gains advantage over other remote controller. Furthermore, one touch-sensitive module  130  may be solely provided in a remote controller  100  to perform the touch-sensing action, or several touch-sensitive modules  130  may be combined together to provide a large-area touch-sensitive module. Besides, several small touch-sensitive modules can be disposed at different areas of the remote controller  100  to achieve flexible design and application. Although the capacitive touch-sensitive module  130  is described in the above embodiments for illustration, it is to be noted that other type of touch-sensitive module is also applicable for all embodiments, e.g. piezoelectric touch-sensitive module whose sensor pads are made of piezoelectric material capable of sensing pressure. 
         [0030]    If the wrapper  31  is transparent or translucent, a light-emitting diode (LED) unit controlled by the processing chip  40  may be displaced within the wrapper  31 . The brightness and/or color of the light-emitting diode unit changes with the touch-sensing result of the sensor pads  21  and  22 . In other words, the light-emitting diode unit provides various illuminating effects according to the sensed gesture/touch action. Please see the structure in  FIG. 5  wherein the transparent wrapper  31  is not shown for clarity and a heat sink is additionally provided. In the structure, a metal layer  431  is formed in a similar way to the sensor pads in the above embodiments. A great portion of the metal layer  431  serves as a conductive portion of the heat sink  43  which is connected to the light-emitting diode unit  42  by an insulating thermal paste  432 . Another portion of the metal layer  431  serves as sensor pads. The sensor pads and the light-emitting diode unit  42  are electrically connected to the processing chip  40  by wires  44  so that the processing chip  40  can process touch-sensing action of the sensor pads and control illumination of the light-emitting diode unit  42 . 
         [0031]    The touch-sensitive modules in the above embodiments may be used in different types of input devices, e.g. input devices for computers or other information systems.  FIG. 6  shows a joystick having a touch-sensitive module according to the present disclosure. The joystick  50  includes a base  52  and a stick  53 . The touch-sensitive module  51  is disposed at a top of the stick  53 . The user moves the stick  53  or touches the touch-sensitive module  51  to control movement of a cursor or an object on the screen. For better control, moving the stick  53  results in fast movement of the cursor or object, while operating the touch-sensitive module  51  results in fine movement of the cursor or object. Therefore, the user can move the stick  53  to rapidly move the cursor near a target position, and then wag his finger or pass his finger over the touch-sensitive module  51  to move the cursor to the precise target position. The control chip (not shown) corresponding to the stick  53  and the processing chip of the touch-sensitive module  51  may be separately provided in the joystick  50  or integrated in one chip according to the real application. For other applications, the touch-sensitive module  51  is provided as a user interface mounted in a vehicle or a cabin of a boat to be operated by a driver/pilot or passengers. 
         [0032]    Furthermore, the touch-sensitive module of the present disclosure can sense floating touch. Therefore, the touch-sensitive module can sense finger movement parallel to the touch surface of the ouch-sensitive module and finger movement toward/away from the touch-sensitive module. According to this technology, a virtual key is formed above the touch surface of the touch-sensitive module. To sense floating touch, overall capacitance change of a group of sensor pads can be calculated to determine the distance between the touch surface and the user finger, palm or other conductive touch object. There is predefined relation between the number of the sensor pads and the sensible distance. For example, seven sensor pads can sense larger range than three sensor pads by detecting overall capacitance change of the sensor pads. Detailed description about grouping of sensor pads can be read from patent applications of TW 201415334, US 2014/0097857 and US 2014/0035865, which are incorporated herein for reference. Since the sensible distance of the capacitive touch-sensitive module is determined by the grouping size, continuing changing the grouping size can be considered as a scan action toward/away from the capacitive touch-sensitive module. After the user operate the capacitive touch-sensitive module to move a cursor to an icon on a panel including the touch-sensitive module, when the user finger moves toward the panel, the capacitive touch-sensitive module can detect this “press” action and make the icon deform such as curving inward to respond to the “press” action. For example, when the capacitive touch-sensitive module detects and realizes that the distance between the panel and the user finger becomes smaller than a threshold distance value, animation effects to the icon, e.g. rupture may be shown. Then, the panel performs a specific function represented by the icon. 
         [0033]    Please refer to  FIG. 7  showing a button of a keypad or a keyboard. The button  60  includes a keycap  61  and a keyswitch  62  wherein the touch-sensitive module  63  is disposed in the keycap  61  of the button  60 . On one hand, the buttons  60  with the touch-sensitive module  63  are pressed to provide character or functional input. One the other hand, one or more buttons  60  with the touch-sensitive module  63  can serve as a touchpad. The touch-sensitive module  63  senses touch action on the button(s)  60  to control the cursor or object to move on the information system. Polar coordinate system is used in movement control of the cursor or object. For example, the touch-sensitive module  63  senses a distance and an angle of the touch point relative to a fixed center point. Thus, the cursor is controlled to move according to the sensed distance and angle. The velocity of the cursor is in proportion to the distance and the moving direction corresponds to the angle. 
         [0034]    Please refer back to  FIG. 1 . The sensing module  152  of the controlled device  150  may be implemented by the above-described touch-sensitive module. The processing chip  40  of the touch-sensitive module  130  issues different voltage signals to drive the sensor pads  21  and  22  of the touch-sensitive module  130  in response to an external control signal. The voltage signal distribution among the sensor pads  21  and  22  may be considered as a code. Furthermore, the voltage signals may have rapid-switching/changing waveforms to change the voltage signal distribution with time. Each remote controller  100  has its own code(s) to be recognized. The sensing module  152  with floating touch function can detect the capacitance changes between the touch-sensitive module  130  and the sensing module  152  to generate a corresponding sensing signal. Thus, the controlled device  150  can decide whether the communication channel should be established according to the sensing signal indicating the capacitance changes corresponding to the code(s) of the remote controller  100 . Thus, authentication of the remote controller  100  is achieved. It is to be noted that capacitive touch-sensing function is described for illustration. In fact, the touch-sensing module  130  and the sensing module  152  can achieve the authentication through other touch-sensing method. It is only required that physical properties of the sensor pads of the touch-sensing module  130  are changed in a particular mode, and the sensing module  152  can detect the changes of the physical properties. 
         [0035]    In this embodiment, the processing chip  40  can receive or issue control signals in different situations. In a first instance, the processing chip  40  detects the changes of the physical properties (e.g. capacitance changes) of the sensor pads resulting from an approaching touch object, and issues an internal control signal to control a designated element (not shown). In as second instance, the processing chip  40  receives an external control signal from other control element (not shown). The processing chip  40  drives the sensor pads and changes the physical properties (e.g. capacitance changes) of the sensor pads in a particular mode in response to the external control signal. 
         [0036]    Please refer to  FIG. 8A , a top view illustrating a capacitive touch-sensitive pad structure according to the present disclosure. The capacitive touch-sensitive pad structure  70  is manufactured by a metal stamping process. The capacitive touch-sensitive pad structure  70  includes a first sensor pad  701 , second sensor pads  702  and a lead frame  703 . The lead frame  703  includes a main frame  7032  and several frame branches  7031 . Each frame branch  7031  has a first end  70311  and a second end  70312  wherein the first end  70311  is connected to only one sensor pad ( 701  or  702 ) and the second end  70312  is connected to the main frame  7032 . The two second sensor pads  702  are electrically connected via wire bonding. The wire  71  across the first sensor pad  701  is isolated from the first sensor pad  701 . Then, the capacitive touch-sensitive pad structure  70  except the main frame  7032  is wrapped by, for example, injection molding. The pad structure  70  is cut along the dotted square  79  to remove the main frame  7032  and a portion of the frame branches  7031  to obtain the capacitive touch-sensitive module. A plurality of the capacitive touch-sensitive modules may be combined in a regular pattern to from a touch panel. Therefore, the manufacturing process is flexible to provide the touch panels with various sizes by combining proper quantity of the touch-sensitive modules. 
         [0037]      FIG. 8B  illustrates another capacitive touch-sensitive pad structure according to the present disclosure. The capacitive touch-sensitive pad structure  80  is manufactured by a metal stamping process. The capacitive touch-sensitive pad structure  80  includes a first sensor pad  801 , a second sensor pad  802 , power pads  808 , grounding pads  809 , signal pads  810  and a lead frame  803 . The lead frame  803  includes a main frame  8032  and several frame branches  8031 . Each frame branch  8031  has a first end  80311  and a second end  80312  wherein the first end  80311  is connected to one of the first sensor pad  801 , the second sensor pad  802 , the power pads  808 , the grounding pads  809  and the signal pads  810 , while the second end  80312  is connected to the main frame  8032 . The dotted square  87  indicates where a circuit chip  870  may be disposed. The power pads  808 , the grounding pads  809  and the signal pads  810  are respectively electrically connected to the circuit  870  via wires  81 ,  82  and  83  by wire bonding, but the present disclosure are not limited to this interconnection method. Then, a portion of the capacitive touch-sensitive pad structure  80  is wrapped by, for example, injection molding. The main frame  8032  and a portion of the frame branches  8031  are cut off to form the capacitive touch-sensitive module with the embedded circuit chip  870 . A plurality of the capacitive touch-sensitive modules may be combined in a regular pattern wherein the embedded circuit chips  870  are selected from more than one circuit chip, e.g. light-emitting diode chip and/or sensor chip. In this instance, the light-emitting diode chip is controlled by control signals received through the signal pads  810 . Alternatively, the sensor chip issues sensed parameters through the signal pads  810 . For example, the sensor chip is a piexoelectric sensor capable of sensing pressure exerted on the sensor pads. It is to be noted that the present disclosure does not limit the location of the circuit chip  870 . The circuit chip  870  may be disposed among the sensor pads, disposed in a hallow portion of one sensor pad or mounted on a surface of one of the pads  801 ,  802 ,  808 ,  809  and  810  by an insulating adhesive material. The surface is a top surface, a bottom surface or a lateral surface of the pad. 
         [0038]      FIG. 8C  illustrates another capacitive touch-sensitive pad structure according to the present disclosure. The structure is similar to the structure shown in  FIG. 8B  except that the signal pads  810  are eliminated. In this instance, the external signals are received through the first sensor pad  801  and the second pad  802 . The circuit chip  870  is electrically connected to the first sensor pad  801  and the second pad  802  by wires  86  and  85 . Thus, by taking advantage of time-division multiplexing (TDM) method, the first sensor pad  801  and the second sensor pad  802  are driven to perform touch-sensing actions during first time slots, and controlling of the circuit chip  870  is performed during second time slots. For other cases, the circuit chip  870  is disposed on a surface of the first sensor pad  801  or the second sensor pad  802 . Under this condition, an insulating layer (not shown) is interposed between the circuit chip  870  and the underlying sensor pad  801  or  802 , or pins of the circuit chip  870  are electrically connected to the underlying sensor pad  801  or  802 . If the circuit chip is a light-emitting diode chip, and a P-type electrode or a N-type electrode is formed at a bottom of the light-emitting diode chip, the light-emitting diode chip can be directly disposed on the first sensor pad  801  or the second sensor pad  82  to form electrical connection between them without any wire. 
         [0039]      FIG. 9  illustrates a touch-sensitive module with fingerprint authentication function. In this touch-sensitive module, two circuit chips  971  and  972  are provided, e.g. light-emitting diode chip  971  and image sensor chip  972 . The circuit chips  971  and  972  may be disposed as described in the above embodiments, e.g. disposed between two sensor pads, disposed in a hallow portion of one sensor pad, mounted on a surface of one sensor pad by an insulating adhesive material, or disposed at other proper position. Thus, the light-emitting diode chip  971  and the image sensor chip  972  can detect a fingerprint of the finger  9  touching the protection structure  900  (e.g. a wrapper with or without a cover lens). When the touch-sensitive module is idle, the circuit chips  971  and  972  are off to decrease power consumption. Once the sensor pads  901 ,  902  and  903  detect that a user finger touches the protection structure  900 , the circuit chips  971  and  972  are switched on to perform fingerprint authentication. After passing the fingerprint authentication, the user can perform further touch operation on the touch-sensitive module. The sensor pads  901 ,  902  and  903  and the circuit chips  971  and  972  are wrapped by injection molding. The protection structure  900  is made of a transparent material. Nevertheless, if the protection structure  900  is translucent or opaque, a through hole or a light-guiding element may be provided on the light path to allow the light transmission. 
         [0040]    The lead frame, the sensor pads, the heat sink and the circuit chip may be arranged on the same plane or at different heights and angles. The present disclosure does not limit the relative positions of them. The layout varies to meet different requirements. For example, the illuminating surface of the light-emitting diode chip is orthogonal to the lead frame. 
         [0041]    In conclusion, the wireless control system, the touch-sensitive module and the touch-sensitive pad structure according to the present disclosure can satisfy wide requirements for remote control or touch control. The modular design of the touch-sensitive module enhances the flexibility and the application of the present disclosure. The proposed touch-sensitive pad structure facilitates simplifying the manufacturing method of the touch-sensitive module. 
         [0042]    While the disclosure has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.