Abstract:
An electromagnetic-type touch display apparatus is disclosed. The apparatus comprises: a first substrate; a second substrate; a first conductive layer formed on the first substrate comprising first electromagnetic induction coils forming loops extending in a first direction; and a second conductive layer formed between the first and second substrates comprising second electromagnetic induction coils forming loops extending in a second direction perpendicular to the first direction. Each of the substrates comprises a display region and a non-display region, and the first and second electromagnetic induction coils are used to determine a touch position, wherein, at least one of the first conductive layer and the second conductive layer is also configured as at least one film layer of the first substrate or the second substrate, which forms a pattern required by the first or second electromagnetic induction coils and transmits a sensing signal.

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 14/479,142, titled “ELECTROMAGNETIC-TYPE TOUCH SUBSTRATE AND ELECTROMAGNETIC-TYPE TOUCH DISPLAY APPARATUS”, filed on Sep. 5, 2014 with USPTO, which claims the priority to Chinese Patent Application No. 201410126714.7, titled “ELECTROMAGNETIC-TYPE TOUCH SUBSTRATE AND ELECTROMAGNETIC-TYPE TOUCH DISPLAY APPARATUS”, filed on Mar. 31, 2014 with the State Intellectual Property Office of People&#39;s Republic of China, both of which are hereby incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The disclosure relates to the panel display technologies, and in particular, to an electromagnetic-type touch substrate and an electromagnetic-type touch display apparatus. 
     BACKGROUND OF THE INVENTION 
     Touch sensing technologies have been widely applied in various electronic products in daily work and life in recent years. As a user can touch a touch screen with a hand or with other objects to input information, dependence of the user on other input devices such as a keyboard, a mouse and a remote controller may be reduced or even eliminated, thereby facilitating operations of the user. 
     The touch screen may be electromagnetic-type, capacitive-type, resistive-type or the like. In an electromagnetic-type touch screen, an electromagnetic field of the electromagnetic induction coils in the touch screen may be changed by changing a distance between an electromagnetic stylus including a coil and the touch screen including exciting coils and the induction coils, and accordingly, weak currents are generated. A touch position may be obtained by performing a calculation on the generated currents. 
     For a conventional electromagnetic-type touch screen, usually, an out-cell electromagnetic-type touch panel is applied. The electromagnetic-type touch panel takes a flexible circuit board as a carrier on which electromagnetic induction coils are provided. In practice, an electromagnetic-type touch screen formed by the out-cell electromagnetic-type touch panel and a display panel results in a large thickness and a complicated wiring. Furthermore, the flexibility of the flexible circuit board in the electromagnetic-type touch panel is actually redundant, thereby causing a waste in cost. 
     BRIEF SUMMARY OF THE INVENTION 
     One inventive aspect is an electromagnetic-type touch display apparatus, comprising: a first substrate; a second substrate, arranged opposite to the first substrate; a first conductive layer formed on a first side of the first substrate far away from the second substrate, wherein the first conductive layer comprises a plurality of first electromagnetic induction coils forming loops extending in a first direction; and a second conductive layer formed between the first substrate and the second substrate, wherein the second conductive layer comprises a plurality of second electromagnetic induction coils forming loops extending in a second direction perpendicular to the first direction, wherein, each of the first substrate and the second substrate comprises a display region and a non-display region, and the first electromagnetic induction coils and the second electromagnetic induction coils are used to determine a touch position, wherein, at least one of the first conductive layer and the second conductive layer is also configured as at least one film layer of the first substrate or the second substrate except for the first conductive layer and the second conductive layer, which forms a pattern required by the first electromagnetic induction coils or the second electromagnetic induction coils and transmits a sensing signal. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       To more clearly explain a technical solution according to embodiments of the disclosure, drawings to be used in the following description of the embodiments are briefly introduced hereinafter. Apparently, those drawings are merely exemplary, and other drawings may be further obtained by the ordinary skilled in the art based on the drawings without creative works. 
         FIG. 1  is a schematic structural diagram of one side of an electromagnetic-type touch substrate according to an embodiment of the present invention; 
         FIG. 2  is a schematic structural diagram of another side of the electromagnetic-type touch substrate shown in  FIG. 1 ; 
         FIG. 3  is a schematic structural diagram of first electromagnetic induction coils or second electromagnetic induction coils according to an embodiment of the present invention; 
         FIG. 4  is another schematic structural diagram of first electromagnetic induction coils or second electromagnetic induction coils according to an embodiment of the present invention; 
         FIG. 5  is further another schematic structural diagram of first electromagnetic induction coils or second electromagnetic induction coils according to an embodiment of the present invention; 
         FIG. 6  is a schematic structural diagram of one side of another electromagnetic-type touch substrate according to an embodiment of the present invention; 
         FIG. 7  is a schematic structural diagram of another side of the electromagnetic-type touch substrate shown in  FIG. 6 ; 
         FIG. 8  is a schematic sectional view of an electromagnetic-type touch display apparatus according to an embodiment of the present invention; and 
         FIG. 9  illustrates an equivalent circuit of an electromagnetic-type touch display apparatus according to an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A technical solution according to embodiments of the disclosure is described clearly and completely hereinafter in conjunction with drawings used in description of the embodiments. Apparently, the described embodiments are merely a part of rather than all of the embodiments of the disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of the disclosure without any creative works shall fall in the scope of the disclosure. 
     To make the technical solution according to the embodiments of disclosure clearer, the solution is detailed in conjunction with the drawings in the following descriptions of the embodiments. 
     An electromagnetic-type touch substrate is provided according to an embodiment of the disclosure.  FIG. 1  is a schematic structural diagram of one side of the electromagnetic-type touch substrate according to the embodiment of the disclosure.  FIG. 2  is a schematic structural diagram of another side of the electromagnetic-type touch substrate shown in  FIG. 1 . As shown in  FIG. 1 , the electromagnetic-type touch substrate includes a substrate  1 . The substrate  1  includes a display region  102  for displaying an image, and a non-display region  101  around the display region  102 . The substrate  1  may be a transparent glass substrate or a flexible resin substrate. A first conductive layer is formed on one side of the substrate  1 . The first conductive layer includes multiple first electromagnetic induction coils  110  which extend in a first direction and form loops. According to the embodiment, the first direction is the horizontal direction. As shown in  FIG. 1 , each first electromagnetic induction coil  110  includes a sensing electrode  111   a  and a sensing electrode  111   b  arranged in parallel in the display region  102 , and a first connecting wire  112  arranged in the non-display region  101  for connecting the sensing electrode  111   a  to the sensing electrode  111   b . Ends of the sensing electrode  111   a  and the sensing electrode  111   b  on one side are connected to each other by the first connecting wire  112 . Ends of the sensing electrode  111   a  and the sensing electrode  111   b  on the other side are respectively connected to a driving chip  4  via first signal transmission wires  113 , to receive a sensing signal. A uniformity of the image displayed in the display region  102  may be improved since the first connecting wires  112  are arranged in the non-display region  101 . The sensing electrode  111   a  in a first row is connected to the sensing electrode  111   b  in a fourth row by the first connecting wire  112 , to form one first electromagnetic induction coil  110 . Alternatively, a sensing electrode in an n th  row may be connected to a sensing electrode in an m th  row by the first connecting wire  112 , to form one first electromagnetic induction coil  110 , where each of n and m is an positive integral equal to or larger than 1, and less than a total number of the sensing electrodes. Values of n and m may be arbitrary in the above-defined range, and may be set reasonably based on a size of the substrate, a pixel resolution, an electromagnetic induction algorithm, etc. 
     As shown in  FIG. 2 , a second conductive layer is formed on another side of the substrate  1 . The second conductive layer includes multiple second electromagnetic induction coils  120  which extend in a second direction and form loops. According to the embodiment, the second direction is the vertical direction. Hence, the first direction is perpendicular to the second direction. Each second electromagnetic induction coil  120  includes a sensing electrode  121   a  and a sensing electrode  121   b  arranged in parallel in the display region  102 , and a second connecting wire  122  arranged in the non-display region  101  for connecting the sensing electrode  121   a  to the sensing electrode  121   b . Ends of the sensing electrode  121   a  and the sensing electrode  121   b  on one side are connected to each other by the second connecting wire  122 . Ends of the sensing electrode  121   a  and the sensing electrode  121   b  on the other side are respectively connected to the driving chip  4  by second signal transmission wires  123 , to receive a sensing signal. The uniformity of the image displayed in the display region  102  may be improved since the second connecting wires  122  are arranged in the non-display region  101 . The sensing electrode  121   a  in a first column is connected to the sensing electrode  121   b  in a fourth column by the second connecting wire  122 , to form one second electromagnetic induction coil  120 . Alternatively, a sensing electrode in an i th  column may be connected to a sensing electrode in a j th  column by the second connecting wire  122 , to form one second electromagnetic induction coil  120 , where each of i and j is an positive integral equal to or larger than 1, and smaller than a total number of the sensing electrodes. Values of i and j may be arbitrary in the above-defined range, and may be set reasonably based on the size of the substrate, the pixel resolution, the electromagnetic induction algorithm, etc. 
     The electromagnetic-type touch substrate according to the embodiment may function as a color film substrate for display apparatuses in types of, for example, In-plane Switching (IPS), Fringe Field Switching (FFS), and Twisted Nematic (TN). Usually, to avoid a static electricity caused during manufacturing and using the display apparatuses, a shielding electrode layer may be formed on one side of the color film substrate. In case of a transient static electricity, the static electricity is discharged via the shielding electrode layer. Hence, a torsion of a liquid crystal molecule may not be influenced by the static electricity, and the image may not be displayed abnormally. The first conductive layer according to the embodiment may be a transparent shielding electrode layer formed with strips functioning as the sensing electrodes  111   a  and the sensing electrodes  111   b  of the first electromagnetic induction coils  110 . A projection of each sensing electrode onto the array substrate may cover at least one row of sub-pixels  211 . 
     A black matrix layer is arranged on the other side of the color film substrate. The black matrix layer is adopted for preventing a backlight leakage, improving a contrast of the displayed image, preventing a color mixing and increasing a color purity. Generally, the black matrix layer is made of a resin material including black dyes and is non-conductive. The black matrix layer according to the embodiment is made of a conductive light-shading material such as titanium sub-oxide or chromium, to transmit the sensing signal. The second conductive layer may be a black matrix layer formed with strips functioning as the sensing electrodes  121   a  and the sensing electrodes  121   b  of the second electromagnetic induction coils  120 . A projection of each sensing electrode onto the array substrate may cover at least one column of the sub-pixels  211 . 
     In the electromagnetic-type touch substrate according to the embodiment of the disclosure, the first conductive layer (i.e., the shielding electrode layer) including the first electromagnetic induction coils is formed on one side of the substrate, and the second conductive layer (i.e., the black matrix layer or a common electrode layer) including the second electromagnetic induction coils is formed on the other side of the substrate. Compared with a conventional art in which a liquid crystal display panel and a module with an electromagnetic input function are assembled in an out-cell manner, the manufacturing process may be simplified, a thickness and a complexity of an electromagnetic-type touch screen may be reduced, a touch display panel is light and thin, and the manufacturing cost is saved. 
     It should be noted that the embodiment is merely exemplary. Other film layers of the substrate, such as the common electrode layer, may be used to implement the first conductive layer or the second conductive layer, as long as the film layers may form a pattern required by the first electromagnetic induction coils or by the second electromagnetic induction coils and the film layers may transmit the sensing signal. 
       FIG. 3  is a schematic structural diagram of first electromagnetic induction coils or second electromagnetic induction coils according to an embodiment of the disclosure. Different from the electromagnetic induction coils shown in  FIG. 1  and  FIG. 2 , each first electromagnetic induction coil or each second electromagnetic induction coil according to the embodiment includes three sensing electrodes  131   a ,  131   b  and  131   c  arranged in parallel. Ends of the three sensing electrodes on one side are connected to each other by a third connecting wire  132 . Ends of the three sensing electrodes on the other side are connected to a driving chip (not illustrated in  FIG. 3 ) by a third signal transmission wire. 
       FIG. 4  is another schematic structural diagram of first electromagnetic induction coils or second electromagnetic induction coils according to an embodiment of the disclosure. Different from the electromagnetic induction coils shown in  FIG. 1  and  FIG. 2 , each first electromagnetic induction coil or each second electromagnetic induction coil according to the embodiment includes a first sensing electrode  131   a , a second sensing electrode  131   b  and a third sensing electrode  131   c  arranged in parallel. The first sensing electrode  131   a  is arranged between the second sensing electrode  131   b  and the third sensing electrode  131   c . A third connecting wire  132  includes a first connecting wire segment  1321  and a second connecting wire segment  1322 , arranged in a non-display region  101 . Ends of the first sensing electrode  131   a  and the second sensing electrode  131   b  on one side are connected to each other by the first connecting wire segment  1321 . Ends of the second sensing electrode  131   b  and the third sensing electrode  131   c  on the other side are connected to each other by the second connecting wire segment  1322 . 
       FIG. 5  is further another schematic structural diagram of first electromagnetic induction coils or second electromagnetic induction coils according to an embodiment of the disclosure. Different from the electromagnetic induction coils shown in  FIG. 1  and  FIG. 2 , each first electromagnetic induction coil or each second electromagnetic induction coil according to the embodiment includes a first sensing electrode  131   a , a second sensing electrode  131   b  and a third sensing electrode  131   c  arranged in parallel. The second sensing electrode  131   b  is arranged between the first sensing electrode  131   a  and the third sensing electrode  131   c . A third connecting wire  132  includes a first connecting wire segment  1321  and a second connecting wire segment  1322 , arranged in a non-display region  101 . Ends of the first sensing electrode  131   a  and the second sensing electrode  131   b  on one side are connected to each other by the first connecting wire segment  1321 . End of the second sensing electrode  131   b  and the third sensing electrode  131   c  on the other side are connected to each other by the second connecting wire segment  1322 . 
       FIG. 6  is another schematic structural diagram of one side of an electromagnetic-type touch substrate according to an embodiment of the disclosure.  FIG. 7  is a schematic structural diagram of another side of the electromagnetic-type touch substrate shown in  FIG. 6 . As shown in  FIG. 6 , a first conductive layer is formed on one side of a substrate  1 . The first conductive layer according to the embodiment is a shielding electrode layer which includes multiple first electromagnetic induction coils  110  extending in a vertical direction and forming loops. Each first electromagnetic induction coil  110  includes two sensing electrodes  111   a  and  111   b  arranged in parallel in a display region  102 , and a first connecting wire  112  arranged in a non-display region  101  for connecting the sensing electrode  111   a  to the sensing electrode  111   b . A uniformity of the image displayed in the display region  102  may be improved since the first connecting wires  112  are arranged in the non-display region  101 . The sensing electrode  111   a  in a first column is connected to the sensing electrode  111   b  in a fourth column by the first connecting wire  112 , to form one first electromagnetic induction coil  110 . Alternatively, a sensing electrode in an n th  column may be connected to a sensing electrode in an m th  column by the first connecting wire  112 , to form one first electromagnetic induction coil  110 , where each of n and m is an positive integral equal to or larger than 1, and less than a total number of the sensing electrodes. Values of n and m may be arbitrary in the above-defined range, and may be set reasonably based on a size of the substrate, a pixel resolution, an electromagnetic induction algorithm, etc. 
     As shown in  FIG. 7 , a second conductive layer, i.e., a black matrix layer is formed on the other side of the substrate  1 . The second conductive layer includes multiple second electromagnetic induction coils  120  extending in a horizontal direction and forming loops. Each second electromagnetic induction coil  120  includes two sensing electrodes  121   a  and  121   b  arranged in parallel in the display region  102 , and a second connecting wire  122  arranged in the non-display region  101  for connecting the sensing electrode  121   a  to the sensing electrode  121   b . The uniformity of the image displayed in the display region  102  may be improved since the second connecting wires  122  are arranged in the non-display region  101 . The sensing electrode  121   a  in a first row is connected to the sensing electrode  121   b  in a fourth row by the second connecting wire  122 , to form one second electromagnetic induction coil  120 . Alternatively, a sensing electrode in an i th  row may be connected to a sensing electrode in a j th  row by the second connecting wire  122 , to form one second electromagnetic induction coil  120 , where each of i and j is an positive integral equal to or larger than 1, and smaller than a total number of the sensing electrodes. Values of i and j may be arbitrary in the above-defined range, and may be set reasonably based on the size of the substrate, the pixel resolution, the electromagnetic induction algorithm, etc. 
     It should be noted that, the first electromagnetic induction coils or the second electromagnetic induction coils shown in  FIGS. 6 and 7  may be implemented with any one or any combination of structures described in  FIG. 3 ,  FIG. 4  and  FIG. 5 , which is not further described herein. 
       FIG. 8  is a sectional view of an electromagnetic-type touch display apparatus according to an embodiment of the disclosure. As shown in  FIG. 8 , the electromagnetic-type touch display apparatus includes an electromagnetic-type touch substrate  1 , and an array substrate  2  arranged opposite to the electromagnetic-type touch substrate  1 . The array substrate  2  includes multiple pixel units (not illustrated in  FIG. 8 ). A liquid crystal layer  3  is arranged between the electromagnetic-type touch substrate  1  and the array substrate  2 . Torsions of liquid crystal molecules in the liquid crystal layer  3  are controlled by changing an electrical field, to display an image. The electromagnetic-type touch substrate  1  includes a first substrate  10 . A first conductive layer is arranged on one side of the first substrate  10 , away from the liquid crystal layer  3 . According to the embodiment, the first conductive layer is a shielding electrode layer  11 . The shielding electrode layer  11  includes multiple first electromagnetic induction coils which extend in a first direction and form loops. Each first electromagnetic induction coil includes sensing electrodes arranged in parallel in a display region, and a first connecting wire arranged in a non-display region for connecting the sensing electrodes. A projection of each sensing electrode onto the array substrate may cover at least one line of sub-pixels. Structures of the first electromagnetic induction coils are same as the structures described in  FIG. 1  or  FIG. 6  and are not further described herein. A first polarizer  14  is arranged on one side of the shielding electrode layer, away from the first substrate  10 . 
     A second conductive layer, i.e., a black matrix layer  12 , and a color filter layer  13  are arranged on the other side of the first substrate  10 , facing the liquid crystal layer  3 . The black matrix layer  12  is conductive and may be made of a conductive light-shading material such as titanium sub-oxide or chromium. The color filter layer  13  may include light resistors of various colors such as red (R), green (G) and blue (B). The black matrix layer  12  includes multiple second electromagnetic induction coils which extend in a second direction and form loops. Each second electromagnetic induction coil includes sensing electrodes arranged in parallel in the display region, and a second connecting wire arranged in the non-display region for connecting the sensing electrodes. A projection of each sensing electrode onto the array substrate may cover at least one line of sub-pixels. Structures of the second electromagnetic induction coils are same as the structures described in  FIG. 2  or  FIG. 7  and are not further described herein. 
     The array substrate  2  includes a second substrate  20 . A thin film transistor element layer  21  is arranged on one side of the second substrate  20 , facing the liquid crystal layer  3 . The thin film transistor element layer  21  includes pixel electrodes and common electrodes. A horizontal electrical field is generated between the pixel electrodes and the common electrodes, to control the torsions of the liquid crystal molecules, and accordingly, the image is displayed. A driving chip  4  is arranged at a step of the second substrate  20  with respect to the first substrate  10 , to provide a driving signal to the array substrate and to provide a sensing signal to the electromagnetic-type touch substrate. A second polarizer  22  is arranged on one side of the second substrate  20 , away from the liquid crystal layer  3 . 
     In the electromagnetic-type touch substrate according to the embodiment of the disclosure, the first conductive layer (i.e., the shielding electrode layer) including the first electromagnetic induction coils is formed on one side of the substrate, and the second conductive layer (i.e., the black matrix layer or a common electrode layer) including the second electromagnetic induction coils is formed on the other side of the substrate. Compared with a conventional art in which a liquid crystal display panel and a module with an electromagnetic input function are assembled in an out-cell manner, the manufacturing process may be simplified, a thickness and a complexity of an electromagnetic-type touch screen may be reduced, a touch display panel is light and thin, and the manufacturing cost is saved. 
       FIG. 9  illustrates an equivalent circuit of an electromagnetic-type touch display apparatus according to an embodiment of the disclosure. According to the embodiment, an electromagnetic-type touch substrate (not illustrated in  FIG. 9 ) includes multiple first electromagnetic induction coils  110  which extend in a horizontal direction and form loops, and multiple second electromagnetic induction coils  120  which extend in a vertical direction and form loops. The first electromagnetic induction coils  110  are formed with a shielding electrode layer, and the second electromagnetic induction coils  120  are formed with a conductive black matrix layer or a common electrode layer. A first control circuit  41  is electrically connected to one side of the first electromagnetic induction coils  110 . The first control circuit  41  includes multiple first TFTs (Thin Film Transistors)  411 , a first control wire  412  for controlling states of the first TFTs  411 , a first signal wire  413  and multiple first detecting units  414 . Gate electrodes of the first TFTs  411  are electrically connected to the first control wire  412 . Source electrodes of the first TFTs  411  are electrically connected to the first signal wire  413 . Drain electrodes of the first TFTs  411  are electrically connected to one side of the first electromagnetic induction coils and to the first detecting units  414 . Alternatively, the drain electrodes of the first TFTs  411  are electrically connected to the first signal wire  413 , and the source electrodes of the first TFTs  411  are electrically connected to one side of the first electromagnetic induction coils and to the first detecting units  414 . 
     A second control circuit  42  is connected to one side of the second electromagnetic induction coils  120 . The second control circuit  42  includes multiple second TFTs  421 , a second control wire  422  for controlling states of the second TFTs  421 , a second signal wire  423  and multiple second detecting units  424 . Gate electrode of the second TFTs  421  are electrically connected to the second control wire  422 . Source electrodes of the second TFTs  421  are electrically connected to the second signal wire  423 . Drain electrodes of the second TFTs  421  are electrically connected to one side of the second electromagnetic induction coils and to the second detecting units  424 . Alternatively, the drain electrodes of the second TFTs  421  are electrically connected to the second signal wire  423 , and the source electrodes of the second TFTs  421  are electrically connected to one side of the second electromagnetic induction coils and to the second detecting units  424 . 
     In the case that the second electromagnetic induction coils  120  are formed with the conductive black matrix layer, during displaying an image, the first control wire  412  and the second control wire  422  respectively control all the first TFTs  411  and all the second TFTs  421  to turn off. 
     In the case that the second electromagnetic induction coils  120  are formed with the common electrode layer, during displaying an image, the second control wire  422  controls all the second TFTs  421  to turn on. A common voltage signal from the second signal wire  423  is applied to the second electromagnetic induction coils  120 . 
     In case of detecting a touch, the first control wire  412  controls all the first TFTs  411  to turn off. The first electromagnetic induction coils  110  are independent from each other. Electromagnetic induction currents are generated in the first electromagnetic induction coils which are electromagnetic induced, and the electromagnetic induction currents are detected by the first detecting unit  414 . Accordingly, a coordinate, in the vertical direction, of a touch position is determined and output. The second control wire  422  controls all the second TFTs  421  to turn off. The second electromagnetic induction coils  120  are independent from each other. Electromagnetic induction currents are generated in the second electromagnetic induction coils  120  which are electromagnetic induced, and the electromagnetic induction currents are detected by the second detecting unit  424 . Accordingly, a coordinate, in the horizontal direction, of the touch position is determined and output. 
     In addition, as shown in  FIG. 9 , according to an embodiment, a first grounding unit  43  is connected to the first control circuit  41 . The first grounding unit  43  includes multiple third TFTs  431 , and a third control wire  432  controlling states of the third TFTs  431 . Gate electrodes of the third TFTs  431  are electrically connected to the third control wire  432 . Source electrodes of the third TFTs  431  are electrically connected to the other side of the first electromagnetic induction coils  110 . Drain electrodes of the third TFTs  431  are grounded. Alternatively, the drain electrodes of the third TFTs  431  are electrically connected to the other side of the first electromagnetic induction coils  110 , while the source electrodes of the third TFTs  431  are grounded. 
     A second grounding unit  44  is connected to the second control circuit  42 . The second grounding unit  44  includes multiple fourth TFTs  441  and a fourth control wire  442  controlling states of the fourth TFTs  441 . Gate electrodes of the fourth TFTs  441  are electrically connected to the fourth control wire  442 . Source electrodes of the fourth TFTs  441  are electrically connected to the other side of the second electromagnetic induction coils  120 . Drain electrodes of the fourth TFTs  441  are grounded. Alternatively, the drain electrodes of the fourth TFTs  441  are electrically connected to the other side of the second electromagnetic induction coils  120 , while the source electrodes of the fourth TFTs  441  are grounded. 
     In the case that the second electromagnetic induction coils  120  are formed with a conductive black matrix layer, during displaying an image, the third control wire  432  and the fourth control wire  442  respectively control all the third TFTs  431  and all the fourth TFTs  441  to turn off. 
     In the case that the second electromagnetic induction coils  120  are formed with a common electrode layer, during displaying an image, the fourth control wire  442  controls all the fourth TFTs  441  to turn off. A common voltage signal is applied to the second electromagnetic induction coils  120 . 
     In case of detecting a touch, the third control wire  432  controls all the third TFTs  431  to turn on, where electromagnetic induction currents are generated in the first electromagnetic induction coils  110  which are electromagnetic induced. The fourth control wire  442  controls all the fourth TFTs  441  to turn on, where electromagnetic induction currents are generated in the second electromagnetic induction coils  120  which are electromagnetic induced. 
     It should be noted that, according to an embodiment, the first TFTs  411  in the first control circuit  41 , the third TFTs  431  in the first grounding unit  43 , the second TFTs  421  in the second control circuit  42  and the fourth TFTs  441  in the second grounding unit  44  are formed on the array substrate. Since at borders of the array substrate, there is a non-display region in which the control circuits or other circuits may be arranged, the first TFTs  411 , the second TFTs  421 , the third TFTs  431  and the fourth TFTs  441  may be manufactured together with TFTs arranged on the array substrate for controlling pixel units. Hence, the manufacturing process is reduced. According to another embodiment, in the case that the switches in the first control circuit  41 , in the second control circuit  42 , in the first grounding unit  43  and in the second grounding unit  44  are implemented with other types of switches (not shown in  FIG. 9 ) rather than the TFT switches, the first control circuit  41 , the second control circuit  42 , the first grounding unit  43  and the second grounding unit  44  may be made either on the array substrate (generally on a step of the array substrate with respect to the color film substrate), or in a client (not shown in  FIG. 9 ) of an terminal product. 
     Therefore, the first electromagnetic induction coils  110  are controlled by the first control circuit  41  and the first grounded unit  43 , and the second electromagnetic induction coils  120  are controlled by the second control circuit  42  and the second grounded unit  44 . Hence, displaying and touch detection may be performed in a time division manner. Accordingly, the displaying and electromagnetic-type touch controlling of the touch display panel are integrated. 
     Moreover, in the electromagnetic-type touch substrate according to an embodiment of the disclosure, the first conductive layer (i.e., the shielding electrode layer) including the first electromagnetic induction coils is formed on one side of the substrate, and the second conductive layer (i.e., the black matrix layer or a common electrode layer) including the second electromagnetic induction coils is formed on the other side of the substrate. Compared with a conventional art in which a liquid crystal display panel and a module with an electromagnetic input function are assembled in an out-cell manner, the manufacturing process may be simplified, a thickness and a complexity of an electromagnetic-type touch screen may be reduced, a touch display panel is light and thin, and the manufacturing cost is saved. 
     In addition, in the case that a projection of each first electromagnetic induction coil onto the array substrate and a projection of each second electromagnetic induction coil onto the array substrate respectively cover at least one row of pixels or at least one column of pixels, if the number of rows or columns of pixels covered by each first electromagnetic induction coil or by each second electromagnetic induction coil is increased, the number of the first electromagnetic induction coils or the number of the second electromagnetic induction coils formed on the color film substrate is significantly reduced. Accordingly, the number of the second TFT switches  421  in the second control circuit or the number of the fourth TFT switches  441  in the second grounding unit  44  is significantly reduced. In case of a same resolution, as compared with a conventional art in which each sub-pixel is provided with one TFT switch for controlling the electromagnetic induction coil, the number of the TFT switches for controlling the electromagnetic induction coils is reduced by at least ⅔ in the disclosure. Since the number of the TFT switches for controlling the electromagnetic induction coils may be reduced in the disclosure, a width of the non-display region, which is arranged on borders of the touch display panel and is for arranging control switches, is reduced, and accordingly, an area of the display region of the touch display panel is increased, which is in accordance with a trend of narrower borders. 
     Furthermore, values of the induction currents generated by the first direction coils or by the second direction coils may be detected as follows. 
     As show in  FIG. 9 , an electromagnetic stylus  5  (or an electromagnetic pointer) is provided to corporate with the touch display panel. If the electromagnetic stylus is active, the first electromagnetic induction coils and the second electromagnetic induction coils generate induction currents due to inductions caused by electromagnetic signals. If the electromagnetic stylus is passive, the first detecting unit and the second detecting unit respectively provide driving electromagnetic signals to the first electromagnetic induction coils and the second electromagnetic induction coils, and then the first electromagnetic induction coils and the second electromagnetic induction coils generate the induction currents due to inductions caused by the electromagnetic signals. In the following, it is explained by taking a passive electromagnetic stylus as an example. 
     A resonance circuit  51  is arranged in the passive electromagnetic stylus  5 . The touch display panel transmits energy into the passive electromagnetic stylus  5  by emitting high-frequency electromagnetic waves. Then the passive electromagnetic stylus  5  returns the electromagnetic signals to the touch display panel. At this time, the touch display panel stops emitting the electromagnetic waves, and is switched to a mode of receiving the electromagnetic waves. In the case that the electromagnetic stylus is near the touch display panel, electromagnetic inductions may take place in the first electromagnetic induction coils  110  and the second electromagnetic induction coils  120  in the touch control display panel. The electromagnetic induction currents generated in the first electromagnetic induction coils  110  are detected by a first detecting unit and are processed to obtain a coordinate of a position of the passive electromagnetic stylus  5  in a second direction (i.e. a vertical direction coordinate). The electromagnetic induction currents generated in the second electromagnetic induction coils  120  are detected by a second detecting unit and are processed to obtain a coordinate of the position of the passive electromagnetic stylus  5  in a first direction (i.e. a horizontal direction coordinate). After the coordinate in the first direction (i.e. the horizontal direction coordinate) and the coordinate in the second direction (i.e. the vertical direction coordinate) are obtained, the position of the passive electromagnetic stylus  5  may be determined. 
     The electromagnetic-type touch substrate and the electromagnetic-type touch display apparatus according to the embodiments of the disclosure are detailed as above. Examples are used herein to set forth the principle and embodiments of the disclosure, and the above descriptions of the embodiments are merely for helping in understanding the method and the core concept of the disclosure. Changes to the embodiments and the application range of the disclosure may be made by those skilled in the art based on the idea of the disclosure. In summary, the specification is not intended to limit the disclosure.