Patent Publication Number: US-2013234969-A1

Title: Touch display panel

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation-in-part of U.S. application Ser. No. 13/587,934, filed Aug. 17, 2012, all disclosure is incorporated therewith. The prior application Ser. No. 13/587,934 claims the priority benefit of Taiwan application serial no. 100129421, filed on Aug. 17, 2011. The entirety of each of the above-mentioned patent applications is hereby incorporated by reference herein and made a part of this specification. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention generally relates to a touch display panel, and more particularly, to a touch display panel which can enhance the entire visual effect. 
     2. Description of Related Art 
     With the progress of electronic technology and the arrival of information era, many information products choose to use touch panels as the input device instead of the traditional input device such as keyboard, mouse, etc. The touch display panel with both touch sensing function and display function has become one of the most prevalent products on the current market. 
     In the conventional touch display panels, the touch-point circuit thereof includes a plurality of X-sensing series and a plurality of Y-sensing series, wherein the Y-sensing series and the X-sensing series are intersected to each other. Generally speaking, at the intersections of the X-sensing series and the Y-sensing series, the two adjacent touch-sensing pads of one X-sensing series or one Y-sensing series are electronically connected via metal bridging lines. However, in the conventional touch display panels, users can easily see the inner structures such as pixels, etc., and this affects thereby deteriorating the visual quality of the touch display panels. Therefore, the visual quality of the touch display panel is still one of the most importance issues that need to be improved. 
     SUMMARY OF THE INVENTION 
     The present invention is further directed to a touch display panel with better visual effect. 
     The present invention provides a touch display panel including a display panel and a touch panel. The display panel includes a shielding pattern and a plurality of pixels separated by the shielding pattern and including multiple edge directions. The touch panel is disposed on the display panel and includes a plurality of first sensing series, a plurality of second sensing series and a plurality of upper dielectric patterns. Each upper dielectric pattern is disposed above an intersected region of each first sensing series and each second sensing series, and each upper dielectric pattern includes at least one edge directions non-parallel to the edge directions of the pixel. 
     According to an embodiment of the present invention, each first sensing series includes a plurality of first sensing pads and a plurality of first connecting lines disposed between two first adjacent sensing pads. Each second sensing series includes a plurality of second sensing pads and a plurality of second connecting lines disposed between two adjacent second sensing pads. Each upper dielectric pattern covers each first connecting line and each second connecting line intersected therewith. 
     According to an embodiment of the present invention, a projection of each upper dielectric pattern is within a projection of each first connecting line or each second connecting line onto the display panel. 
     According to an embodiment of the present invention, a projection of each upper dielectric pattern covers a projection of each first connecting line or each second connecting line onto the display panel. 
     According to an embodiment of the present invention, the edge directions of each upper dielectric pattern are not orthogonal to the edge directions of each pixel. 
     According to an embodiment of the present invention, the upper dielectric patterns are rectangular, and the included angle between the four edge directions of the rectangular dielectric patterns and the edge directions of the pixels are not 0 degree or 90 degrees. 
     According to an embodiment of the present invention, the included angles between the four edge directions of the rectangular dielectric patterns and the edge directions of the pixels are between 0 degree to 80 degrees. 
     According to an embodiment of the present invention, the included angles between the four edge directions of the rectangular dielectric patterns and the edge directions of the pixels are 45 degrees. 
     According to an embodiment of the present invention, each upper dielectric pattern has at least one edge directions not orthogonal to the edge directions of each pixel, and a projection of each upper dielectric pattern covers a projection of each first connecting line or each second connecting line onto the display panel. 
     According to an embodiment of the present invention, each upper dielectric pattern includes an upper surface in the form of the convex and distant from the pixels. 
     According to an embodiment of the present invention, the touch display panel further comprises a plurality of bottom dielectric patterns, wherein each bottom dielectric pattern is disposed between each first sensing series and each second sensing series intersected therewith. 
     According to an embodiment of the present invention, the touch display panel further comprises a passivation layer, wherein the passivation layer is disposed between the upper dielectric patterns and the first sensing series or disposed between the upper dielectric patterns and the second sensing series. 
     According to an embodiment of the present invention, the upper dielectric patterns are made of the organic material. 
     According to an embodiment of the present invention, the display panel includes liquid crystal display panel, organic electro-luminescent display panel, electrowetting display panel, or electrophoretic display panel. 
     Based on the description above, in the touch display panel of the present invention, by setting specific included angles between the edge directions of the pixels and the edge directions of the upper dielectric pattern disposed above the intersected sensing series, the interference between the dielectric patterns (i.e. upper dielectric patterns or bottom dielectric patterns) and the shielding pattern can be destroyed. The problems such as the inner structures are easily seen due to the shielding pattern of the pixels enlarged by the dielectric patterns (i.e. upper dielectric patterns or bottom dielectric patterns) are solved. Therefore, the touch display panel can have better visual effect. 
     In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanying figures are described in detail below. 
    
    
     
       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 cross-sectional view of the touch display panel of one embodiment of the present invention. 
         FIG. 1B  is a schematic partial view of the arrangement of the pixels and the shielding pattern in the display panel and the arrangements of the sensing series and the dielectric patterns in the touch panel of  FIG. 1A . 
         FIG. 1C  is a schematic cross-sectional view taken along a section line B-B′ depicted in  FIG. 1B . 
         FIG. 2A  illustrates the touch display panel of one embodiment of the present invention. 
         FIG. 2B  and  FIG. 2C  are comparative examples of the touch display panel of the present invention. 
         FIG. 3A  is a partial enlarged view of the dielectric patterns arrangement of a comparative example of the present invention, and  FIG. 3B  is a top view of the touch display panel according to the arrangement of  FIG. 3A . 
         FIG. 4A  is a partial enlarged view of the dielectric patterns arrangement of one embodiment of the present invention, and  FIG. 4B  is a top view of the touch display panel according to the arrangement of  FIG. 4A . 
         FIG. 5A  is a schematic partial view of the arrangement of the pixels and the shielding pattern in the display panel and the arrangements of the sensing series and the dielectric patterns in the touch panel of second embodiment of the present invention. 
         FIG. 5B  is a schematic cross-sectional view along line D-D′ of  FIG. 5A . 
         FIG. 6  is a schematic partial view of the arrangement of the pixels and the shielding pattern in the display panel and the arrangements of the sensing series and the dielectric patterns in the touch panel of one embodiment of the present invention. 
         FIG. 7  is a schematic partial view of the arrangement of the pixels and the shielding pattern in the display panel and the arrangements of the sensing series and the dielectric patterns in the touch panel of one embodiment of the present invention. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     The black matrix and the pixels with periodical structures disposed underneath are obviously seen by the user because of the focus effect resulted from the shape of the dielectric pattern similar to that of the convex such that the visual effect of the touch display panel is worse. Therefore, the dielectric patterns of the present invention are properly designed based on the edge directions of the pixels in the display panel to blur the contour between the black matrix and the pixels and enhance the visual effect. 
     To explain the spirit of the touch display panel of the present invention more clearly, a few embodiments are listed in the following paragraphs for reference, but the present invention is not limited thereto. 
     First Embodiment 
       FIG. 1A  is a schematic cross-sectional view of the touch display panel of one embodiment of the present invention.  FIG. 1B  is a schematic partial view of the arrangement of the pixels and the shielding pattern in the display panel and the arrangement of the sensing series and the dielectric patterns in the touch panel of  FIG. 1A .  FIG. 1A  is a cross-sectional view taken along the section line A-A′ depicted in  FIG. 1B .  FIG. 1C  is a cross-sectional view taken along the section line B-B′ depicted in  FIG. 1B . 
     Please refer to both  FIG. 1A  and  FIG. 1B , the touch display panel  200  includes a display panel  210  and a touch panel  220 . The display panel  210  can be a LCD panel. In other embodiments, the display panel also may be an organic electro-luminescent display panel, an electrowetting display panel, or an electrophoretic display panel. The display panel  210  includes a shielding pattern  212  and a plurality of pixels P separated by the shielding pattern  212  wherein each pixel P comprises a plurality of edge directions PL. The display panel  210  of the present embodiment includes a substrate  214 , a color filter  216  and an active element array layer  218  disposed therebetween, but the present invention is not limited thereto. 
     Further in more detail, the shielding pattern  212  of the present embodiment includes a plurality of first shielding stripes B 1  extending along a first direction D 1 , and a plurality of second shielding stripes B 2  extending along a second direction D 2 . The first shielding stripes B 1  and the second shielding stripes B 2  are intersected to form a meshed shielding pattern  212 , and each pixel P disposed in each opening of the shielding pattern  212 . In the present embodiment, the material of shielding pattern  212  is, for example, black resin, so the shielding pattern  212  can also be called black matrix. The pixels P of the present embodiment includes a plurality of red pixels PR, a plurality of green pixels PG, and a plurality of blue pixels PB. 
     As shown in  FIG. 1A ,  FIG. 1B  and  FIG. 1C , the touch panel  220  is disposed on the display panel  210 . The touch panel  220  includes a plurality of first sensing series  222 , a plurality of second sensing series  224  and a plurality of dielectric patterns  226 . Each dielectric pattern  226  is disposed between each first sensing series  222  and each second sensing series  224  intersected with the first sensing series  222 , wherein the dielectric patterns  226  are made of organic materials. 
     More specifically, in the present embodiment, the first sensing series  222  extend along the first direction D 1 , and each first sensing series  222  includes a plurality of first sensing pads  222 A serially connected with each other and a plurality of first connecting lines  222 B disposed between the two adjacent first sensing pads  222 A. The second sensing series  224  extend along the second direction D 2 . Each second sensing series  224  includes a plurality of second sensing pads  224 A serially connected with each other, and a plurality of second connecting lines disposed between the two adjacent second sensing pads  224 A. Each dielectric pattern  226  is disposed between each first connecting line  222 B and each second connecting line  224 B intersected with the first connecting line  222 B, so that the first sensing series  222  and the second sensing series  224  are electrically insulated from each other. The first sensing pads  222 A and the second sensing pads  224 A can be disposed on the same or different substrate. In the present embodiment, the first connecting lines  222 B and the second connecting lines  224 B are disposed respectively underneath and upon the dielectric patterns  226 , and the materials of the first connecting lines  222 B and the second connecting lines  224 B includes transparent conducting materials. Obviously, the positions of first connecting lines  222 B and the second connecting lines  224 B may be interchanged. The present invention is not limited thereto. 
     In particular, as shown in  FIG. 1B , the edge directions of every dielectric pattern  226  are tilted to the edge directions of the pixels P. It should be noted that, the so called tilted means the edge directions of every dielectric pattern  226  (D 3  and D 4  as shown) are neither parallel nor orthogonal to the edge directions of the pixels P (D 1  and D 2  as shown). More specifically, as shown in  FIG. 1B , the edge directions, i.e. the extending directions of the edge directions PL, are the extending directions of the first shielding stripes B 1  and that of the second shielding stripes B 2  of the shielding pattern  212 . For example, in this embodiment, the extending direction of the short edge direction PL 1  is the first direction D 1 , and the extending direction of the long edge direction PL 2  is the first direction D 2 . 
     The dielectric patterns  226  of the present embodiment are, for example, rectangular, and the shielding pattern  212  is disposed right over the diagonal lines of the rectangular dielectric patterns  226 . Therefore, the shielding pattern  212  is overlapped to the diagonal lines of the rectangular dielectric patterns  226 . The extending directions of the four edges L 1 -L 4  of the rectangular dielectric pattern  226  are the edge directions wherein the edge direction of the edges L 1  and L 3  is D 3 , and the edge direction of the edges L 2  and L 4 . In particular, the included angles between the edge directions D 3  and D 4  of the rectangular dielectric patterns  226  and the edge directions D 1  and D 2  of the pixels P are not 0 degree or 90 degrees. As shown in  FIG. 1B , the acute included angles between the edge directions D 3  and D 4  and the edge directions D 1  and D 2  are 45 degrees. 
     By making the edge directions D 3  and D 4  of the dielectric patterns  226  tilted to the edge directions D 1  and D 2  of the pixels P, the edge contours of the dielectric patterns  226  and the edge contour of the black matrix are not parallel overlapped, thereby mitigating the interference with each other. The contours can be blurred when the acute included angles between the edge directions of D 3  and D 4  of the rectangular dielectric pattern  226  and the edge directions D 1  and D 2  of the pixels P are not equal to 0 degree or 90 degrees. Preferably, the acute included angles is between 0 degree to 80 degrees. More preferably, the included angles between the edge directions of D 3  and D 4  of the rectangular dielectric patterns  226  and the edge directions D 1  and D 2  of the pixels P are 45 degrees. By means of the above method, the interference between the dielectric patterns  226  and the shielding pattern  212  can be mitigated to solve the visual effect problem. 
     Moreover, as shown in  FIG. 1A  and  FIG. 1C , the upper surface of each dielectric pattern  226  distant from the pixels comprises a convex  226   a  curved in one dimension to form a structure similar to a lenticular lens. The dielectric patterns  226  with convex structure have focus effect, so the pixels P, the shielding pattern  212 , or the first connecting lines  222 B disposed under the dielectric patterns  226  and in focus of the lenticular lens are easily visually enlarged by the dielectric patterns  226 . Therefore, the magnified image can be seen by the user to identify the inner structures of the touch display panel such that the quality of the visual effect is decreased. However, by making the edge directions D 3  and D 4  of each dielectric pattern  226  in the touch display panel  200  of the present invention tilted to the edge directions Dl and D 2  of the pixels P, the periodically arranged contours of the pixels P and the shielding pattern  212  can be effectively blurred, thereby enhancing the visual quality for the users and solving the poor visual quality problem caused by the convex effect of the dielectric patterns  226  described above. 
     For a better illustration of the arrangement of the dielectric patterns and the pixels and the visual effects the users can see, a few figures for analyzing and comparing the embodiments of the visual effects and the arrangement of the dielectric patterns and the pixels are provided to thoroughly and completely disclose the purposes of the touch display panel of the present invention, but the present invention is not limited thereto. 
       FIG. 2A  is one embodiment of the touch display panel of the present invention.  FIG. 2B  and  FIG. 2C  are the comparative examples of the touch display panel of the present invention. Please refer to  FIG. 2A , when the users look at the region R 1  of the touch display panel  200  on the left side of  FIG. 2A , by making the edge directions D 3  and D 4  of the dielectric pattern  226  tilted to the edge directions D 1  and D 2  of the pixels, for example, 45 degrees, the edges of the dielectric pattern  226  and the edges of the pixels are not parallel overlapped, thereby blurring the contours between the dielectric pattern  226  and the shielding pattern  212  disposed at the edges of the pixels P, which leads to the visual effect as shown on the right side of  FIG. 2A . The problem of identifying the pixels P, the shielding pattern  212  or the first connecting lines  222 B by the users is thus can be avoided, and the visual quality for the users can also be enhanced. 
     On the contrary,  FIG. 2B  shows the situation which the long edge direction D 3  of the dielectric pattern  226  is parallel to the edge direction D 1  of the pixels. Due to the focus effect similar to the convex of the dielectric pattern  226 , when the users look at region R 2  of the touch display panel  200  on the left side of  FIG. 2B , the shielding pattern  212  and the pixels P are visually enlarged by the dielectric pattern  226  to provide the visual effect shown on the right side of  FIG. 2B . The contour can not be blurred when the long edge direction D 3  of the dielectric pattern  226  is parallel to the edge direction D 1  of the pixels. After the sharp contour with high contrast ratio between the pixels P and the shielding pattern  212  is visually enlarged, the contour is more easily seen by the users to identify the pattern such that the visual quality is decreased. Similarly,  FIG. 2C  shows the situation when the short edge direction D 4  of the dielectric pattern  226  is parallel to the edge direction of the pixels D 1 . When the users look at region R 3  of  FIG. 2C , similar problem of decreasing the visual effect will also occurs. 
       FIG. 3A  is a partial enlarged view of the dielectric patterns arrangement as a comparative example of the present invention, and the right side and the left side of  FIG. 3B  are the visual photo of the touch display panel and the illustrating figure thereof according to the arrangement of  FIG. 3A . On the other hand,  FIG. 4A  is a partial enlarged view of the dielectric patterns arrangement as a comparative example of the present invention, and the right side and the left side of  FIG. 4B  are the visual photo of the touch display panel and the illustrating figure thereof according to the arrangement of  FIG. 4A . 
     Please refer to  FIG. 3A ,  FIG. 3B ,  FIG. 4A  and  FIG. 4B , when the edge directions D 3  and D 4  of the dielectric pattern  226  are parallel to the edge directions D 1  and D 2  of the pixels P, as shown in  FIG. 3A , the region M of the top view of  FIG. 3B  can be clearly identified an unexpected pattern as a white dot configured periodically. On the other hand, when the edge directions D 3  and D 4  are tilted to the edge directions D 1  and D 2  of the pixels and are not parallel or orthogonal to each other, as shown in  FIG. 4A , the unexpected patterns which are clearly seen in  FIG. 3B  are obscured and can not be identified in region M of  FIG. 4B  which is the same position of  FIG. 3B . Comparing to the comparative example of  FIG. 3B , the touch display panel  200  of the present embodiment as shown in  FIG. 4B  has better visual quality. In summary, the touch display panel of the present invention comprises specific included angles between the edge directions of the dielectric patterns and the pixels, so the contours between the pixels, the shielding pattern and the dielectric patterns can be blurred and the interference between the dielectric patterns and the shielding pattern can be minimized. Therefore, the problem of the pixels easily identified can be solved, and the visual effect of the touch display panel can be improved. 
     Second Embodiment 
       FIG. 5A  is a schematic partial view of the arrangement of the pixels and the shielding pattern in the display panel and the arrangements of the sensing series and the dielectric patterns in the touch panel of second embodiment of the present invention.  FIG. 5B  is a cross-sectional view taken along the section line D-D′ depicted in  FIG. 5A . 
     As shown in  FIGS. 5A and 5B , in a touch display panel  300  of the present embodiment, the touch panel  320  is similar to touch panel  220  of the first embodiment in  FIG. 1A-1C . The difference between touch panel  320  and touch panel  220  is that the touch panel  320  of the present embodiment further comprises upper dielectric pattern  336 A. 
     More specifically, as shown in  FIGS. 5A and 5B , the touch panel  320  includes a plurality of first sensing series  322 , a plurality of second sensing series  324  and a plurality of upper dielectric patterns  326 A. Each upper dielectric pattern  326 A is disposed above an intersected region of each first sensing series  322  and each second sensing series  324 , wherein the upper dielectric patterns  326 A are made of organic materials. Moreover, in this embodiment, the touch panel  320  of this embodiment further comprises a plurality of bottom dielectric patterns  326 B and a passivation layer  340 . Each bottom dielectric pattern  326 B is disposed between each first sensing series  322  and each second sensing series  324  intersected with the first sensing series  322 , so as to isolate the first sensing series  322  and the second sensing series  324 . The passivation layer  340  of this embodiment is disposed between the upper dielectric pattern  326 A and the bottom dielectric pattern  326 B. The first sensing series  322  and the second sensing series  324  of the second embodiment are the same as the first sensing series  222  and the second sensing series  224  of the first embodiment. For clearer illustration, identical reference numerals are used on elements identical with those in the first embodiment. 
     It should be noticed that, as shown in  FIG. 5A , the edge directions of every upper dielectric pattern  326 A are tilted to the edge directions of the pixels P. It should be noted that, the so called tilted means the edge directions of every upper dielectric pattern  326 A (D 3  and D 4  as shown) are neither parallel nor orthogonal to the edge directions of the pixels P (D 1  and D 2  as shown). It should be noted that the contours can be blurred when the acute included angles between the edge directions of D 3  and D 4  of the rectangular upper dielectric pattern  326 A and the edge directions D 1  and D 2  of the pixels P are not equal to 0 degree or 90 degrees as mentioned above. Preferably, the acute included angles are between 0 degree to 80 degrees. Further lore, the upper dielectric patterns  326 A of the present embodiment are, for example, rectangular. Furthermore, in this embodiment, a projection of upper dielectric pattern  326 A is within a projection of first connecting lines  222 B or second connecting line  224 B onto the display panel  210 . 
     Based on the above, by arranging upper dielectric patterns having edge directions non-parallel to the edge directions of the pixel to touch display panel of the present invention can blur the contours between the pixels, so as to minimize the interference between the dielectric patterns and the shielding pattern. 
     Third Embodiment 
       FIG. 6  is a schematic cross-sectional view of the touch display panel of third embodiment of the present invention. As shown in  FIG. 6 , in a touch display panel  400  of the present embodiment, the touch panel  420  is similar to touch panel  320  of the second embodiment in  FIG. 5A . The difference between touch panel  420  and touch panel  320  is that the size of upper dielectric pattern  426 A of the present embodiment is greater than first connecting line  222 B and second connecting line  224 B. For clearer illustration, identical reference numerals are used on elements identical with those in the first embodiment. 
     More specifically, a projection of each upper dielectric pattern  426 A of the present embodiment covers a projection of the corresponding first connecting line  222 B or the corresponding second connecting line  224 B onto the display panel  210 . It should be noted that the contours can be blurred when the acute included angles between the edge directions of D 3  and D 4  of the rectangular upper dielectric pattern  426 A and the edge directions D 1  and D 2  of the pixels P are not equal to 0 degree or 90 degrees as mentioned above. 
     By arranging such an upper dielectric patterns having edge directions non-parallel to the edge directions of the pixel to touch display panel of the present invention can blur the contours between the pixels, so as to minimize the interference between the dielectric patterns and the shielding pattern. 
     Fourth Embodiment 
       FIG. 7  is a schematic cross-sectional view of the touch display panel of fourth embodiment of the present invention. As shown in  FIG. 7 , in a touch display panel  500  of the present embodiment, the touch panel  520  is similar to touch panel  320  of the second embodiment in  FIG. 5A . The difference between touch panel  520  and touch panel  320  is that the size of upper dielectric pattern  526 A of the present embodiment is greater than first connecting line  222 B and second connecting line  224 B. Moreover, each upper dielectric pattern  526 A has at least one edge directions not orthogonal to the edge directions of each pixel. For example, the upper dielectric pattern  526 A has two edges E 1  and E 2 , whose directions are both D 5 , parallel to the edge direction D 1  of the pixel P, and the upper dielectric pattern  526 A has two other edges E 3  and E 4 , whose shape are both like a semicircular, not parallel to the edge direction D 2  of the pixel P. 
     By arranging such an upper dielectric patterns having edge directions (i.e. E 3  and E 4  of upper dielectric pattern  526 A as shown on  FIG. 7 ) non-parallel to the edge directions of the pixel to touch display panel of the present invention can blur the contours between the pixels, so as to minimize the interference between the dielectric patterns and the shielding pattern. 
     Although the invention has been described with reference to the above embodiments, it will be apparent to one of the ordinary skill in the art that modifications to the described embodiment may be made without departing from the spirit of the invention. Accordingly, the scope of the invention will be defined by the attached claims not by the above detailed descriptions.