please refer to fig1 , which is a schematic diagram of a touch control device 10 according to an embodiment of the present invention . the touch control device 10 not only detects two - dimensional characteristics of a touch , but also concurrently detects the touch in vertical directions . the touch control device 10 mainly includes touch pads pad_ 1 - pad_n and a logic unit 100 . the touch pads pad_ 1 - pad_n are superimposed on each other through adhesive means , and each of the touch pads is capable of sensing touch status and generating a corresponding touch result . the logic unit 100 determines a content of a touch event according to the touch result generated by the touch pads pad_ 1 - pad_n . more specifically , the content of the touch event includes a position and intensity , i . e . three - dimensional characteristics of the touch event . please refer to fig2 and 3 for more detail . fig2 is a schematic diagram of an arbitrary touch pad pad_x of the touch control device 10 , and fig3 is a bird &# 39 ; s eye view perspective diagram of the touch pad pad_x . the touch pad pad_x includes a first substrate 200 , a second substrate 202 , detecting wires wrv_ 1 - wrv_s , wrh_ 1 - wrh_t , and detecting units 204 , 206 . as shown in fig2 and 3 , the detecting wires wrv_ 1 - wrv_s are horizontally disposed along a vertical direction on the first substrate 200 , with sensing units duv disposed at fixed distances ; the detecting wires wrh_ 1 - wrh_t are vertically disposed along a horizontal direction on the second substrate 202 , with sensing units duh disposed at fixed distances . the sensing units duv and duh are disposed at relative positions , as shown in fig3 , for detecting touch at a same position . moreover , the detecting unit 204 is coupled to the detecting wires wrv_ 1 - wrv_s , for detecting variations of electrical characteristics of the detecting wires wrv_ 1 - wrv_s to output a detection result det_v to the logic unit 100 . the detecting unit 206 is coupled to the detecting wires wrh_ 1 - wrh_t , for detecting variations of electrical characteristics of the detecting wires wrh_ 1 - wrh_t to output a detection result det_h to the logic unit 100 . therefore , the logic unit 100 may determine a vertical position at which the touch event occurs according to the detection result det_v generated by the detecting unit 204 ; and the logic unit 100 may determine a horizontal position at which the touch event occurs according to the detection result det_h generated by the detecting unit 206 . for example , please refer to fig4 , which is a schematic diagram of the arbitrary touch pad pad_x detecting a touch event . as shown in fig4 , if a finger touches an intersection between the detecting wires wrv_ 1 and wrh_ 2 , the detection result det_v outputted by the detecting unit 204 would indicate electrical signal variations on the detecting wire wrv_ 1 ; similarly , the detection result det_h outputted by the detecting unit 206 would indicate electrical signal variations on the detecting wire wrh_ 2 . therefore , the logic unit 100 may determine the touch event occurs at a position ( 2 , 1 ). further , the detection results det_v , det_h outputted by the detecting units 204 , 206 may include an electrical signal intensity , e . g . to detect how a signal intensifies when the finger is closer , and weakens when the finger is further away . as such , the logic unit 100 can determine not only a position of the touch event , but also an intensity of the touch event , i . e . to detect the touch event in three dimensions . therefore , via superimposing the touch pads pad_ 1 - pad_n , the touch control device 10 can detect three - dimensional characteristics of the touch event , thereby enhancing operation variability . note that , the essence of the present invention lies in superimposing the touch pads pad_ 1 - pad_n to detect three - dimensional characteristics of a touch event , and any variations made accordingly are within the scope of the present invention . for example , despite the first substrate 200 and second substrate 202 being separately depicted in fig2 , the two may be two wiring layers within a single double - layered or multi - layered circuit board . moreover , materials for forming the touch pads pad_ 1 - pad_n are not limited ; transparent materials may be used for touch display devices . in other words , in the example of fig2 , a transparent material is used for the first substrate 200 , the second substrate 202 , and the detecting wires wrv_ 1 - wrv_s , wrh_ 1 - wrh_t . in addition , the variation of electrical characteristics detected by the touch pads pad_ 1 - pad_n may be an electric charge variation , or any other electrical signal capable of indicating characteristics of a touch event . furthermore , through suitably adjusting operations of the logic unit 100 , the touch control device 10 of the present invention may further be applied in three - dimensional multi - touch operations , thereby further enhancing operation variability . note that , in the touch control device 10 , sizes of the touch pads pad_ 1 - pad_n ; layout , lengths and quantity of the detecting wires , and quantity of the substrates may all be different . as such , the touch control device 10 may be further applied to multi - touch applications . for example , please refer to fig6 which is a perspective schematic diagram of touch pads of a touch control device 60 according to an embodiment of the present invention . the touch control device 60 has a same structure as that of the touch control device 10 , and only a layout of the detecting wires in the touch pads is shown for conciseness . the touch control device 60 includes four layers of touch pads , each touch pad including only a single substrate for disposing the detecting wires , wherein a first layer touch pad is disposed with detecting wires a 1 - a 6 , a second layer touch pad is disposed with detecting wires b 1 - b 6 , a third layer touch pad is disposed with detecting wires c 1 - c 6 , and a fourth layer touch pad is disposed with detecting wires d 1 - d 6 . moreover , as shown in fig6 , the detecting wires a 1 - a 6 and b 1 - b 6 cover an entirety of the touch pad , whereas the detecting wires c 1 - c 3 only cover an upper - left corner of the touch pad , the detecting wires c 4 - c 6 only cover a bottom - right corner of the touch pad , the detecting wires d 1 - d 3 touch pads only cover a bottom - left corner of the touch pad , and the detecting wires d 4 - d 6 only cover an upper - right corner of the touch pad . consequently , as shown in fig7 , when a user concurrently touches two points on the touch control device 60 , the logic unit may correctly determine that a touch event occurs on the detecting wires a 2 , b 1 , c 1 and a 5 , b 5 , c 5 through the partially disposed detecting wires c 1 - c 6 , d 1 - d 6 , and avoid the “ ghost key ” problem . in other words , in example of fig7 , the “ ghost key ” would have occurred on the detecting wires a 5 , b 1 , d 5 and a 2 , b 5 , d 2 , yet such faulty determination is avoided since in this case the detecting wires d 5 , d 2 do not detect a touch . note that , fig6 and 7 are used to illustrate that the layout and quantity of the detecting wires in each touch pad in the present invention , as well as the quantity of substrates , etc . may all be modified to suit different application requirements , and are not subject to any limitations . for example , fig8 is a perspective schematic diagram of touch pads of a touch control device 80 according to an embodiment of the present invention . for conciseness , only a layout of the detecting wires of the touch pads is shown . the touch control device 80 includes double - layered touch pads , each touch pad including only a single substrate for disposing the detecting wires ; wherein the first touch pad is disposed with detecting wires ax 1 - ax 4 , and the second touch pad is disposed with detecting wires bx 1 - bx 4 . as shown in fig8 , the detecting wires ax 1 - ax 4 are not disposed horizontally to each other , and similarly the detecting wires bx 1 - bx 4 are not disposed horizontally to each other . moreover , angles projected by intersections between the detecting wires ax 1 - ax 4 and the detecting wires bx 1 - bx 4 are not orthogonal , as is the case in aforementioned embodiments . additionally , fig9 is a perspective schematic diagram of touch pads of a touch control device 90 according to an embodiment of the present invention , also only showing the layout of the detecting wires of the touch pad . the touch control device 90 includes three - layered touch pads , each touch pad including a single substrate for disposing the detecting wires , wherein the first touch pad is disposed with detecting wires ay 1 - ay 3 , the second touch pad is disposed with detecting wires by 1 - by 3 , and the third touch pad is disposed with detecting wires cy 1 - cy 3 . as shown in fig9 , the detecting wires ay 1 - ay 3 , by 1 - by 3 , cy 1 - cy 3 are curve - shaped , also suited for the present invention . additionally , fig1 is a perspective schematic diagram of touch pads of a touch control device 110 according to an embodiment of the present invention , also only showing the layout of the detecting wires of the touch pad . the touch control device 110 includes double - layered touch pads , each touch pad including a single substrate for disposing the detecting wires , wherein the first touch pad is disposed with detecting wires az 1 - az 6 , and the second touch pad is disposed with detecting wires bz 1 - bz 6 . as shown in fig1 , the detecting wires az 1 - az 6 are of unequal lengths , and the detecting wires bz 1 - bz 6 are of unequal lengths , suitable for implementing triangular touch control devices , also suited for the present invention . those skilled in the art should understand via the aforementioned embodiments that the layout of the detecting wires in the present invention is not limited , and may be suitably adjusted for different application requirements . as can be seen from the above , the present invention utilizes superimposed touch pads to detect three - dimensional characteristics of a touch event . additionally , the present invention may be modified to suit multi - touch applications through adjusting layout or quantity of the detecting wires in each touch pad , to avoid the “ ghost key ” problem . in summary , the present invention detects three - dimensional characteristics of a touch event and accommodates multi - touch applications to enhance operation variability . 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 .