Patent Publication Number: US-2010123681-A1

Title: Touch panel and touch display panel

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of Taiwan application serial no. 97144760, filed on Nov. 19, 2008. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of specification. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to a panel structure, and more particularly, to a touch panel and a touch display panel. 
     2. Description of Related Art 
     In current information era, human beings by degrees tend to rely on electronic products. The electronic products such as mobile phones, handheld personal computers (PCs), personal digital assistants (PDAs) and smart phones have pervaded everywhere in our daily life. To meet current demands on portable, compact, and user-friendly information technology (IT) products, touch panels have been introduced as input devices in replacement of conventional keyboards or mice. Among the touch panels, a touch display panel capable of performing both a touch function and a display function is one of the most popular products at present. 
       FIG. 1  is a schematic partial cross-sectional view of a conventional added-type touch display panel. Referring to  FIG. 1A , the touch display panel  100  includes a display panel  110 , a touch panel  120 , and an optical adhesive  130  for adhering the display panel  110  to the touch panel  120 . Here, the display panel  110  is a liquid crystal display (LCD) which is able to achieve a multi-color display effect. The LCD includes an array substrate  112 , a liquid crystal layer  114 , and a color filter substrate  116 . The touch panel  120  is a capacitance touch panel and includes a substrate  122 , a plurality of lower electrodes  124 , a dielectric layer  126 , and an upper electrode  128 . When a user presses the touch panel  120 , the capacitance value between the upper electrode  128  and the lower electrodes  124  is changed, and thereby frames or images displayed on the display panel  110  can be further changed based on the user&#39;s choices. 
     Nonetheless, the thickness of the added-type touch display panel is not likely to be reduced, and therefore an integrated-type touch display panel has been proposed.  FIG. 1B  is a schematic partial cross-sectional view of a conventional integrated-type touch display panel. Referring to  FIG. 1B , the integrated-type touch display panel  100   a  includes an array substrate  112 , a liquid crystal layer  114 , an electrode layer  140 , a color filter layer  142 , a touch layer  144 , and a substrate  148 . The touch layer  144  includes a plurality of touch electrodes  146  and a plurality of signal lines (not shown) which are connected to the touch electrodes  146 . In general, the touch electrodes are distributed into a display area of the entire touch display panel, and one signal line is connected to a plurality of touch electrodes. As such, the excessive touch electrodes result in excessive parasitic capacitance, thereby negatively affecting sensitivity of the touch display panel. Moreover, the layout of the touch electrodes complicates the manufacturing process of the touch display panel, therefore reducing yield thereof. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to a touch display panel equipped with touch electrodes and signal lines. 
     The present invention is further directed to a touch panel capable of performing both a touch function and a color filtering function. 
     In the present invention, a touch display panel including an array substrate, a color filter substrate, and a liquid crystal layer is provided. The color filter substrate is disposed opposite to the array substrate and has a touch area and a non-touch area. Besides, the color filter substrate includes a shielding layer, a plurality of touch electrodes, a plurality of signal lines, and a plurality of color filter patterns. The shielding layer has a plurality of transparent areas. The touch electrodes are disposed in the touch area and above the shielding layer. The signal lines are disposed above the shielding layer, and each of the signal lines is connected to only one of the touch electrodes. The color filter patterns are disposed above the touch electrodes and correspond to the transparent areas of the shielding layer. The liquid crystal layer is sandwiched between the array substrate and the color filter substrate. 
     In an embodiment of the present invention, the touch electrodes include a plurality of first touch electrodes and a plurality of second touch electrodes. The signal lines include a plurality of first signal lines and a plurality of second signal lines. Each of the first signal lines is connected to only one of the first touch electrodes and extends along a first direction, and each of the second signal lines is connected to only one of the second touch electrodes and extends along a second direction. 
     In an embodiment of the present invention, the first direction is different from the second direction. 
     In an embodiment of the present invention, a material of the touch electrodes is a transparent conductive material. 
     In the present invention, a touch display panel including an array substrate, a color filter substrate, and a liquid crystal layer sandwiched between the array substrate and the color filter substrate is provided. The color filter substrate is disposed opposite to the array substrate and has a touch area and a non-touch area. Besides, the color filter substrate includes a plurality of touch electrodes, a plurality of signal lines, a shielding layer, and a plurality of color filter patterns. The touch electrodes are disposed in the touch area, and each of the touch electrodes has a plurality of transparent areas. Each of the signal lines is electrically connected only to only one of the touch electrodes. The shielding layer is disposed corresponding to gaps among the touch electrodes. The color filter patterns are disposed above the touch electrodes and the shielding layer and correspond to the transparent areas of the touch electrodes. 
     In an embodiment of the present invention, the touch electrodes include a plurality of first touch electrodes and a plurality of second touch electrodes. The signal lines include a plurality of first signal lines and a plurality of second signal lines. Each of the first signal lines is connected to only one of the first touch electrodes and extends along a first direction, and each of the second signal lines is connected to only one of the second touch electrodes and extends along a second direction. 
     In an embodiment of the present invention, a material of the transparent areas is a transparent conductive material. 
     In the present invention, a touch panel including a substrate, a touch layer, and a color filter layer is provided. The touch layer is disposed on the substrate and includes a first touch electrode, a first signal line, and a shielding layer. The first signal line is electrically connected only to the first touch electrode. The color filter layer is disposed on the substrate. 
     In an embodiment of the present invention, the first touch electrode has a non-transparent area and a transparent area. 
     In an embodiment of the present invention, the touch layer further includes a first insulating layer disposed on the substrate. 
     In an embodiment of the present invention, the first insulating layer is disposed between the first touch electrode and the shielding layer. 
     In an embodiment of the present invention, the first insulating layer is disposed between the first touch electrode and the color filter layer. 
     In an embodiment of the present invention, the first insulating layer is disposed between the shielding layer and the color filter layer. 
     In an embodiment of the present invention, the touch layer further includes a second touch electrode and a second signal line, and the second signal line is electrically connected only to the second touch electrode. 
     In an embodiment of the present invention, the second touch electrode has a non-transparent area and a transparent area. 
     In an embodiment of the present invention, the touch layer further includes a second insulating layer disposed on the substrate. 
     In an embodiment of the present invention, the second insulating layer is disposed between the second touch electrode and the first touch electrode. 
     In an embodiment of the present invention, the second insulating layer is disposed between the second touch electrode and the shielding layer. 
     In an embodiment of the present invention, the second insulating layer is disposed between the second touch electrode and the color filter layer. 
     In an embodiment of the present invention, the first signal line is parallel to the second signal line. 
     In an embodiment of the present invention, a primary gap exists between the first touch electrode and the second touch electrode. 
     In an embodiment of the present invention, the shielding layer includes a primary shielding area corresponding to the primary gap. 
     In an embodiment of the present invention, the color filter layer includes a plurality of color filter patterns, and a secondary gap exists between every two of the color filter patterns. 
     In an embodiment of the present invention, the shielding layer further includes a secondary shielding area corresponding to the secondary gap. 
     In the present invention, a touch display panel including an array substrate, the touch panel disclosed above, and a liquid crystal layer is provided. The touch panel is disposed opposite to the array substrate. The liquid crystal layer is sandwiched between the array substrate and the touch panel. 
     According to the present invention, the touch panel is equipped with both the touch function and the color filtering function. Therefore, the touch panel and the array substrate are assembled, and the liquid crystal layer fills therebetween, such that the touch display panel is formed. In comparison with the conventional touch display panel formed by adhering the touch panel to the display panel, a thickness of the touch display panel of the present invention is rather thin. 
     Moreover, in the touch display panel of the present invention, each of the signal lines is electrically connected only to only one of the touch electrodes, such that the number of the touch electrodes in the panel is decreased. As such, the unfavorable sensitivity of the touch display panel resulting from the excessive parasitic capacitance which is generated by the excessive touch electrodes can be prevented. 
     To make the above and other features and advantages of the present invention more comprehensible, several embodiments accompanied with figures are detailed as follows. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings constituting a part of this specification are incorporated herein to provide a further understanding of the invention. Here, the drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. 
         FIG. 1A  is a schematic partial cross-sectional view of a conventional added-type touch display panel. 
         FIG. 1B  is a schematic partial cross-sectional view of a conventional integrated-type touch display panel. 
         FIG. 2A  is a schematic top view of a touch display panel according to an embodiment of the present invention. 
         FIG. 2B  is a schematic cross-sectional view taken along a line I-I′ in  FIG. 2A . 
         FIG. 2C  is a schematic partial cross-sectional view of  FIG. 2B . 
         FIG. 3A  is a schematic top view of a touch display panel according to another embodiment of the present invention. 
         FIG. 3B  is a schematic top view of a touch display panel according to still another embodiment of the present invention. 
         FIGS. 4 to 8  are schematic partial cross-sectional views of a touch panel according to other embodiments of the present invention. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Touch Display Panel 
       FIG. 2A  is a schematic top view of a touch display panel according to an embodiment of the present invention.  FIG. 2B  is a schematic cross-sectional view taken along a line I-I′ in  FIG. 2A . 
     Referring to  FIG. 2A , the touch display panel  300  includes a display area  302  and a non-display area  304 . In the present embodiment, electrodes  224   a  and  224   b  serving as touch electrodes are disposed in the display area  302 . Signals lines  226   a  and  226   b  are connected to the touch electrodes  224   a  and  224   b , extend from the touch electrodes  224   a ,  224   b  to the non-display area  304 , and are electrically connected to corresponding devices or circuits (not shown). In the present embodiment, the touch electrodes  224   a  are arranged at two opposite sides of the display area  302 , and the touch electrodes  224   b  are arranged at the bottom side of the display area  302 . The bottom side having the touch electrodes  224   b  is arranged and connected between the two opposite sides having the touch electrodes  224   a . However, the number of the touch electrodes  224   a ,  224   b  and the positions thereof in the display area  302  are not limited in the present invention. Each of the signal lines  226   a  is connected to only one of the touch electrodes  224   a  and extends along a first direction (e.g. horizontal direction). Each of the signal lines  226   b  is connected to only one of the touch electrodes  224   b  and extends along a second direction (e.g. vertical direction). In the present embodiment, the first direction is different from the second direction. 
     Based on the above, referring to the cross-sectional view shown in  FIG. 2B , the touch display panel  300  includes an array substrate  310 , a touch panel  200 , and a liquid crystal layer  320 . The liquid crystal layer  320  is sandwiched between the array substrate  310  and the touch panel  200 . The array substrate  310  can be an active device array substrate. Besides, the array substrate  310  includes a first substrate  312  and an active layer  314 . The first substrate  312  can be a glass substrate, a plastic substrate, or any other appropriate substrate. 
     The touch panel  200  in the touch display panel  300  of the present embodiment is inverted, and a schematic cross-sectional view of the inverted touch panel  200  is depicted in  FIG. 2C  for the purpose of elaboration. Referring to  FIGS. 2B and 2C  together, the touch panel  200  can be a color filter substrate having a touch function. Besides, the touch panel  200  includes a second substrate  210 , a touch layer  220 , and a color filter layer  230 . In the present embodiment, the touch panel  200  can further include a planarization layer  240  and an electrode film  250 . 
     The second substrate  210  can be a glass substrate, a plastic substrate, or any other appropriate substrate. Besides, the second substrate  210  includes a touch area  212  and a non-touch area  214 . In the present embodiment, the touch area  212  is disposed in a display area  302  of the touch display panel  300 . That is to say, the display area  302  is where the touch screen is positioned. Specifically, not only frames or images can be displayed on the display area  302 , but also words or letters can be displayed on the display area  302  and directly chosen from or inputted to the display area  302  by a user. 
     The touch layer  220  includes a shielding layer  222 , touch electrodes  224   a ,  224   b , and signal lines  226   a  and  226   b  connected to the touch electrodes  224   a  and  224   b  respectively. The signal lines  226   a  and  226   b  are illustrated in  FIG. 2A . In the present embodiment, the touch layer  220  further includes insulating layers  227  and  228 . 
     According to the present embodiment, the shielding layer  222  is disposed on a surface of the second substrate  210  and has a primary shielding area  222   a , a plurality of secondary shielding areas  222   b  usually smaller than the primary shielding area  222   a , and a plurality of transparent areas  222   c  between primary shielding area  222   a  and adjacent secondary shielding area  222   b  or between the adjacent secondary shielding areas  222   b , so as to form a lattice-like structure. The shielding layer  222  can be made of a conductive material (e.g. metal) or a non-conductive material (e.g. black resin). The transparent areas  222   c  can be openings penetrating the shielding layer  222 , and the openings are filled with the insulating layer  227  which is mostly on the shielding layer  222 . 
     On the other hand, the touch electrodes  224   a ,  224   b  are disposed above the shielding layer  222 . A primary gap G 1  exists between two adjacent touch electrodes  224   a ,  224   b  and corresponds to the primary shielding area  222   a . The touch electrodes  224   a ,  224   b  can be made of a transparent conductive material, such as indium tin oxide (ITO), cadmium tin oxide (CTO), aluminum zinc oxide (AZO), indium zinc oxide (IZO), zinc oxide (ZnO), tin oxide (SnO), or a combination thereof. 
     The color filter layer  230  is disposed on the touch layer  220  and includes a plurality of color filter patterns  232 . The color filter patterns  232  can be red filter patterns, blue filter patterns, or green filter patterns. Besides, the color filter patterns  232  are disposed corresponding to the transparent areas  222   c , and a secondary gap G 2  exists between every two of the color filter patterns  232  and is usually smaller than the primary gap G 1 , which should not be construed as a limitation to the present invention. In another embodiment, the shielding layer  222  and the color filter layer  230  can be in the same layer, and the secondary gaps G 2  are filled with the secondary shielding areas  222   b  of the shielding layer  222 . 
     On the other hand, an insulating layer  227  is disposed between the shielding layer  222  and the touch electrodes  224   a ,  224   b , and an insulating layer  228  is disposed between the color filter layer  230  and the touch electrodes  224   a ,  224   b . The insulating layers  227  and  228  can be made of silicon oxide, silicon nitride, or other dielectric materials. 
     Moreover, the planarization layer  240  covers the color filter patterns  232 , such that the color filter layer  230  can have relatively high planarity. Additionally, the planarization layer  240  can be made of an organic insulating material or an inorganic insulating material. The electrode film  250  is located on the planarization layer  240  for driving the liquid crystal layer  320 . Besides, the electrode film  250  can be made of a transparent conductive material, such as ITO, CTO, AZO, IZO, ZnO, SnO, or a combination thereof. 
     Optical films including polarizers and brightness enhanced films can be further disposed on the touch display panel  300 . In the above embodiment, the touch LCD panel  300  is taken as an example, while the present invention should not be construed as limited to the touch LCD panel  300 . According to other embodiments, the touch panel  200  can also be assembled to other types of display panels. 
     The touch electrodes, the signal lines, and the filter patterns are integrated to form the touch panel according to the present embodiment, such that the touch panel is equipped with both the touch function and the color filtering function. Therefore, the touch display panel can be formed by merely assembling the touch panel and the array substrate and filling the liquid crystal layer between the assembled touch panel and array substrate. Namely, the touch display panel  300  is a display panel with built-in touch electrodes and built-in signal lines. Hence, in comparison with the conventional added-type touch display panel of which the touch panel is adhered to the outside of the display panel, the touch display panel  300  of the present invention has a reduced thickness. 
     Further, in comparison with the conventional integrated-type touch display panel, the touch display panel  300  of the present invention can be formed by performing a rather simplified manufacturing process, and yield of the touch display panel  300  can also be improved. Additionally, in the touch display panel  300 , each of the signal lines is merely connected to only one of the touch electrodes. For instance, each of the signal lines  226   a  is electrically connected only to the corresponding touch electrode  224   a  but not to other touch electrodes. Note that the signal lines  226   a  are still connected to external signal receivers or other external devices, so as to transmit signals thereto. Each of the signal lines  226   b  is electrically connected only to the corresponding touch electrode  224   b  but not to other touch electrodes. Note that the signal lines  226   b  are still connected to external signal receivers or other external devices, so as to transmit signals thereto. Therefore, since each of the signal lines is merely connected to only single one touch electrode, the number of the touch electrodes in the panel can be reduced. As such, the unfavorable sensitivity of the touch display panel  300  resulting from the excessive parasitic capacitance which is generated by the excessive touch electrodes can be prevented. 
     According to the embodiment depicted in  FIGS. 2A to 2C , the touch electrodes are disposed in the display area. However, the disposition of the touch electrodes is not limited to the above according to the present invention. The touch electrodes can also be disposed in other areas according to another embodiment of the present invention as described hereinafter. 
     In general, the display panel formed by assembling the array substrate and the color filter substrate is frequently equipped with an embellished housing. The housing often covers a portion of the display area, and the image display area is an area exposed by the housing. In the embodiment depicted in  FIG. 3A , the touch electrodes  224  are disposed in a non-image area  302   a  of the display area  320 . Namely, the non-image area  302   a  is part of the display area  302  but does not serve to display frames or images. As such, the touch electrodes  224  do not pose an impact on actual image display, and consumers&#39; preferences for large-sized display frame can be satisfied. 
     In addition, the signal lines  226   a  and  226   b  of the present embodiment depicted in  FIGS. 2A to 2C  have different extending directions. However, the different extending directions of the signal lines  226   a  and  226   b  should not be construed as a limitation to the present invention. In another embodiment of the present invention as illustrated in  FIG. 3B , the signal lines  226   a  and  226   b  in a display panel  300   b  have the same extending direction (e.g. vertical direction). 
     Moreover, in the above embodiment, the structure of the touch panel  200  in the touch display panel  300  is exemplified in  FIG. 2C , which should not be construed as limited to the present invention. The structure of the touch panel proposed in the present invention can also be referred to the structures depicted in  FIGS. 4-8  and described hereinafter. 
     Touch Panel 
     Referring to  FIG. 4 , components of a touch panel  200   a  are similar to those of the touch panel  200  illustrated in  FIG. 2B , and therefore the same components are labeled by the same reference numbers. Touch electrodes  224   a  and  224   b  in the touch panel  200   a  are disposed in different film layers. Therefore, an insulating layer  229  insulating the touch electrode  224   a  from the touch electrode  224   b  is disposed between the touch electrodes  224   a  and  224   b.    
     In other words, according to the present embodiment, the touch panel  200   a  includes a shielding layer  222 , an insulating layer  227 , the touch electrode  224   a , the insulating layer  229 , the touch electrode  224   b , an insulating layer  228 , a color filter layer  230 , a planarization layer  240 , and an electrode film  250  that are sequentially stacked on a second substrate  210 . Here, alternatively, the shielding layer  222  and the color filter layer  230  can be positioned in the same layer, which should not be construed as a limitation to the present invention. 
     In another embodiment of the present invention as shown in  FIG. 5 , components of a touch panel  200   b  are similar to those of the touch panel  200  illustrated in  FIG. 2A , and therefore the same components are labeled by the same reference numbers. Touch electrodes  224   a ′ and  224   b ′ in the touch panel  200   b  are disposed on the second substrate  210 , and a primary gap G exists between every two of the adjacent touch electrodes  224   a ′ and  224   b ′. Besides, each touch electrode  224   a ′ and each touch electrode  224   b ′ have a plurality of transparent areas T and a plurality of non-transparent areas, so as to form a lattice-like structure. A material of the touch electrodes  224   a ′ and  224   b ′ can be a non-transparent conductive material, such as tantalum, chromium, molybdenum, titanium, aluminum, and so on. The transparent areas T can be openings penetrating the touch electrodes  224   a ′ and  224   b ′, and the openings can be filled with a transparent conductive material, such as ITO, CTO, AZO, IZO, ZnO, SnO, or a combination thereof. 
     A primary shielding area  222 ′ of the shielding layer  222  is correspondingly disposed above the primary gap G between the touch electrodes  224   a ′ and  224   b . The color filter patterns  232  are located above the primary shielding area  222 ′ and the touch electrodes  224   a ′ and  224   b ′. Besides, the color filter patterns  232  are arranged corresponding to the transparent areas T of the touch electrodes  224   a ′ and  224   b ′. Here, alternatively, the shielding layer  222  can be in the same layer together with the touch electrode  224   a ′, the touch electrode  224   b ′, or the color filter layer  230 , which should not be construed as a limitation to the present invention. 
     In other words, according to the present embodiment, the touch panel  200   b  includes the touch electrodes  224   a ′ and  224   b ′, an insulating layer  227 , the primary shielding area  222 ′, an insulating layer  228 , the color filter layer  230 , a planarization layer  240 , and an electrode film  250  that are sequentially stacked on a second substrate  210 . 
       FIG. 6  is a schematic partial cross-sectional view of a touch panel according to a fourth embodiment of the present invention. Components of the touch panel  200   c  in  FIG. 6  are similar to those of the touch panel  200   b  illustrated in  FIG. 5 , and therefore the same components are labeled by the same reference numbers. Touch electrodes  224   a ′ and  224   b ′ in the touch panel  220   c  are formed by different film layers. Therefore, an insulating layer  229  insulating the touch electrode  224   a ′ from the touch electrode  224   b ′ is disposed between the touch electrodes  224   a ′ and  224   b′.    
     That is to say, according to the present embodiment, the touch panel  200   c  includes the touch electrode  224   a ′, the insulating layer  229 , the touch electrode  224   b ′, an insulating layer  227 , a primary shielding area  222 ′, an insulating layer  228 , a color filter layer  230 , a planarization layer  240 , and an electrode film  250  that are sequentially stacked on a second substrate  210 . Here, alternatively, the primary shielding area  222 ′ can be in the same layer together with the touch electrode  224   a ′, the touch electrode  224   b ′, or the color filter layer  230 , which should not be construed as a limitation to the present invention. 
     In another embodiment of the present invention as shown in  FIG. 7 , components of a touch panel  200   d  are similar to those of the touch panel  200   b  illustrated in  FIG. 5 , and therefore the same components are labeled by the same reference numbers. Touch electrodes  224   a ′ and  224   b ′ in the touch panel  200   d  are located between a primary shielding area  222 ′ and a color filter layer  230 . 
     Namely, according to the present embodiment, the touch panel  200   d  includes the primary shielding area  222 ′, an insulating layer  227 , the touch electrodes  224   a ′ and  224   b ′, an insulating layer  228 , the color filter layer  230 , a planarization layer  240 , and an electrode film  250  that are sequentially stacked on a second substrate  210 . Here, alternatively, the primary shielding area  222 ′ can be in the same layer together with the touch electrode  224   a ′, the touch electrode  224   b ′, or the color filter layer  230 , which should not be construed as a limitation to the present invention. 
     In another embodiment of the present invention as shown in  FIG. 8 , components of a touch panel  200   e  are similar to those of the touch panel  200   d  illustrated in  FIG. 7 , and therefore the same components are labeled by the same reference numbers. Touch electrodes  224   a ′ and  224   b ′ in the touch panel  220   e  are formed by different film layers. Therefore, an insulating layer  229  insulating the touch electrode  224   a ′ from the touch electrode  224   b ′ is disposed between the touch electrodes  224   a ′ and  224   b′.    
     Namely, according to the present embodiment, the touch panel  200   e  includes a primary shielding area  222 ′, an insulating layer  227 , the touch electrode  224   a ′, the insulating layer  229 , the touch electrode  224   b ′, an insulating layer  228 , a color filter layer  230 , a planarization layer  240 , and an electrode film  250  that are sequentially stacked on a second substrate  210 . Here, alternatively, the primary shielding area  222 ′ can be in the same layer together with the touch electrode  224   a ′, the touch electrode  224   b ′, or the color filter layer  230 , which should not be construed as a limitation to the present invention. 
     The touch panel respectively illustrated in  FIGS. 4 to 8  can be assembled to the array substrate  310  depicted in  FIG. 2 , and the touch LCD panel can be formed after the liquid crystal layer  320  is filled between the assembled touch panel and array substrate  310 . 
     In light of the foregoing, the touch display panel of the present invention is a display panel with built-in touch electrodes and built-in signal lines. Therefore, in comparison with the conventional touch display panel formed by adhering the touch panel to the display panel, the touch display panel of the present invention has a reduced thickness and can be formed by performing a simplified manufacturing process, so as to comply with current market demands on miniature electronic products and to increase yield of the touch display panel. 
     Moreover, in the touch display panel of the present invention, each of the signal lines is connected only to only one of the touch electrodes, such that the number of the touch electrodes in the panel is decreased. As such, the unfavorable sensitivity of the touch display panel resulting from the excessive parasitic capacitance which is generated by the excessive touch electrodes can be prevented. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.