Abstract:
Configurations of patterns on a touch panel and methods thereof are proposed. The proposed pattern uses a design unparallel to either one of the X axis and the Y axis of a black matrix of a pixel layout of an LCD panel to resolve the Moiré Phenomenon resulting from the interference between the touch panel and the pixel layout.

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS 
       [0001]    This application claims the benefits of Taiwan Patent Application Number 102125112 filed on Jul. 12, 2013, at the Taiwan Intellectual Property Office, the disclosures of which are incorporated herein in their entirety by reference. 
       FIELD OF THE INVENTION 
       [0002]    The present invention relates to a touch panel design and a method thereof, in particular to a touch panel design and a method thereof for avoiding a Moiré phenomenon. 
       BACKGROUND OF THE INVENTION 
       [0003]    The pixels on a liquid crystal display (LCD) are regularly arranged. When the electrode patterns on a touch panel are designed, the pixels are closer to one another with a smaller pitch, and the pixels are parallel to the electrode patterns, it is easy for a Moiré phenomenon to appear when the pixels overlap the electrode patterns. To counter this optical interference phenomenon, the regularity of the patterns must be interrupted in order to prevent the occurrence of the optical interference phenomenon of bright and dark fringes. 
         [0004]      FIG. 1  shows a schematic diagram of the patterns in transparent conducting film (e.g. Indium Tin Oxide, ITO) on a conventional touch panel. In  FIG. 1 , the touch panel  1  includes a plurality of touch units  11 . 
         [0005]      FIG. 2  shows a schematic diagram of an RGB array on a conventional LCD panel. In  FIG. 2 , the RGB array  2  includes a plurality of RGB units. 
         [0006]      FIG. 3(   a ) shows a schematic diagram of a conventional single touch unit  11 . The conventional single touch unit  11  includes a first sensing line  111 , a second sensing line  112 , a first modifying area  113 , a second modifying area  114 , an isolation layer  115 , a metal line  116 , a first conducting layer free area  117 , a second conducting layer free area  118 , a first driving line  119 , a second driving line  1110 , a third modifying area  1111  and a fourth modifying area  1112 . When each of the first to the fourth modifying areas  113 ,  114 ,  1111  and  1112  includes at least one auxiliary block, except for the first conducting layer free area  117  and the second conducting layer free area  118 , the rest of the simple touch unit  11  is formed by a transparent conducting film, e.g. an ITO. And, when each of the first to the fourth modifying areas  113 ,  114 ,  1111  and  1112  includes zero auxiliary blocks, the first and the third modifying areas  113  and  1111  are a part of the first driving line  119 , and the second and the fourth modifying areas  114  and  1112  are a part of the second driving line  1110 .  FIG. 3(   b ) shows a schematic diagram of the RGB array  2  of the conventional LCD as shown in  FIG. 2 .  FIG. 3(   c ) is a schematic diagram showing the Moiré interference phenomenon resulting from the overlap of the single touch unit  11  as shown in  FIG. 3(   a ) and the RGB array  2  of the conventional LCD as shown in  FIG. 3(   b ). Thus, a method to overcome the limitations of the existing technologies to make the electrode patterns on the touch panel employ a design (unparallel to either the X or Y axis of the pixel layout of the LCD) to resolve the Moiré optical phenomenon resulting from the interference between the electrode patterns and the pixel layout, is worthy of further research and improvement. 
         [0007]    Keeping the drawbacks of the prior arts in mind, and through the use of robust and persistent experiments and research, the applicant has finally conceived a touch panel design and a method thereof 
       SUMMARY OF THE INVENTION 
       [0008]    It is therefore an objective of the present invention to provide patterns on a touch panel using a design unparallel to either one of the X axis and the Y axis of a pixel layout of an LCD panel to solve the Moiré optical phenomenon resulting from the interference between the touch panel and the pixel layout. 
         [0009]    In accordance with the first aspect of the present invention, a touch panel includes a plurality of touch units, each the touch unit has a first driving line, a second driving line, a first sensing line and a second sensing line, wherein the touch panel is configured on an LCD having a pixel layout, the pixel layout has a black matrix with an X axis and a Y axis, each of the first driving line, the second driving line, the first sensing line and the second sensing line has an edge with a plurality of turning angles, and each the edge is unparallel to either one of the X axis and the Y axis. 
         [0010]    In accordance with the second aspect of the present invention, a touch panel includes a plurality of touch units, each the touch unit has a first driving line and a first sensing line, wherein the touch panel is configured on an LCD having a pixel layout, the pixel layout has a black matrix with an X axis and a Y axis, each of the first driving line and the first sensing line has an edge with a plurality of turning angles, and each the edge is unparallel to either one of the X axis and the Y axis. 
         [0011]    In accordance with the third aspect of the present invention, a touch panel is configured on an LCD having a pixel layout, wherein the pixel layout has a black matrix with an X axis and a Y axis, the touch panel has a plurality of touch units, each the touch unit includes a plurality of electrode lines, each the electrode line has an edge, and each the edge is unparallel to either one of the X axis and the Y axis. 
         [0012]    In accordance with the fourth aspect of the present invention, a method for eliminating a Moiré phenomenon on a touch panel includes: providing an LCD having a pixel layout, and the touch panel having a plurality of touch units, wherein the pixel layout has a black matrix with an X axis and a Y axis, each the touch unit includes a first driving line, a second driving line, a first sensing line and a second sensing line, and each of the lines has an edge including a plurality of turning angles; and causing each the edge unparallel to either one of the X axis and the Y axis to avoid the Moiré phenomenon generated between the touch panel and the pixel layout. 
         [0013]    In accordance with the fifth aspect of the present invention, a method for eliminating a Moiré phenomenon on a screen, wherein the screen includes a touch panel and an LCD, the LCD has a pixel layout, the pixel layout has a black matrix with an X axis and a Y axis, and the touch panel includes a plurality of touch units, comprises: providing a plurality of electrode lines for each the touch unit, each the electrode line has an edge; and causing each the edge unparallel to either one of the X axis and the Y axis. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]    Other objectives, advantages and efficacy of the present invention will be described in detail below taken from the preferred embodiments with reference to the accompanying drawings, in which: 
           [0015]      FIG. 1  is a schematic diagram of patterns of a transparent conducting film (e.g. ITO) on a conventional touch panel. 
           [0016]      FIG. 2  is a schematic diagram of an RGB array on a conventional LCD. 
           [0017]      FIG. 3(   a ) is a schematic diagram of a conventional single touch unit. 
           [0018]      FIG. 3(   b ) is a schematic diagram of the RGB array  2  of the conventional LCD as shown in  FIG. 2 . 
           [0019]      FIG. 3(   c ) is a schematic diagram showing the Moiré interference phenomenon resulting from the overlap of the single touch unit  11  as shown in  FIG. 3(   a ) and the RGB array  2  of the conventional LCD as shown in  FIG. 3(   b ). 
           [0020]      FIG. 4  is a schematic diagram of a single touch unit according to the first preferred embodiment of the present invention. 
           [0021]      FIG. 5  is a schematic diagram of a single touch unit according to the second preferred embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0022]    The present invention will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of preferred embodiments of this invention are presented herein for purposes of illustration and description only; it is not intended to be exhaustive or to be limited to the precise form disclosed. 
         [0023]      FIG. 4  shows a schematic diagram of a single touch unit according to the first preferred embodiment of the present invention. In  FIG. 4 , the single touch unit  21  includes a first sensing line  211 , a second sensing line  212 , a first modifying area  213 , a second modifying area  214 , an isolation layer  115 , a metal line  116 , a first driving line  215 , a second driving line  216 , a first conducting layer free area  217 , a second conducting layer free area  218 , a third modifying area  219  and a fourth modifying area  2110 . Each of the first to the fourth modifying areas  213 ,  214 ,  219  and  2110  includes zero, or at least one auxiliary block (e.g. a dummy ITO). When each of the first to the fourth modifying areas  213 ,  214 ,  219  and  2110  includes at least one auxiliary block, except for the first conducting layer free area  217  and the second conducting layer free area  218 , the rest of the simple touch unit  21  is formed by a transparent conducting film, e.g. an ITO. And, when each of the first to the fourth modifying areas  213 ,  214 ,  219  and  2110  includes zero auxiliary blocks, the first and the third modifying areas  213  and  219  are a part of the first driving line  215 , and the second and the fourth modifying areas  214  and  2110  are a part of the second driving line  216 . A touch panel including the single touch unit  21  is configured on an LCD having a pixel layout, and the pixel layout has a black matrix with an X axis and a Y axis. As shown in  FIG. 4 , each the edge of the first sensing line  211 , the second sensing line  212 , the first driving line  215  and the second driving line  216  is a curve, and each the curve is unparallel to the X axis and the Y axis. A turning angle is an angle between each the curve and a line parallel to the X axis or the Y axis, and is unequal to 0 degrees, 90 degrees, or 180 degrees to avoid a Moiré phenomenon being generated between the touch panel and the pixel layout. 
         [0024]      FIG. 5  shows a schematic diagram of a single touch unit according to the second preferred embodiment of the present invention. In  FIG. 5 , the single touch unit  31  includes a first sensing line  311 , a second sensing line  312 , a first modifying area  313 , a second modifying area  314 , an isolation layer  115 , a metal line  116 , a first driving line  315 , a second driving line  316 , a first conducting layer free area  317 , a second conducting layer free area  318 , a third modifying area  319  and a fourth modifying area  3110 . Each of the first to the fourth modifying areas  313 ,  314 ,  319  and  3110  includes zero, or at least one auxiliary block (e.g. a dummy ITO). When each of the first to the fourth modifying areas  313 ,  314 ,  319  and  3110  includes at least one auxiliary block, except for the first conducting layer free area  317  and the second conducting layer free area  318 , the rest of the simple touch unit  31  is formed by a transparent conducting film, e.g. an ITO. And, when each of the first to the fourth modifying areas  313 ,  314 ,  319  and  3110  includes zero auxiliary blocks, the first and the third modifying areas  313  and  319  are a part of the first driving line  315 , and the second and the fourth modifying areas  314  and  3110  are a part of the second driving line  316 . A touch panel including the single touch unit  31  is configured on an LCD having a pixel layout, and the pixel layout has a black matrix with an X axis and a Y axis. As shown in  FIG. 5 , each the edge of the first sensing line  311 , the second sensing line  312 , the first driving line  315  and the second driving line  316  is a series of segments, and each the series of segments is unparallel to the X axis and the Y axis. Each the series of segments has a plurality of turning angles. Each the turning angle of each the curve is an angle between each the curve and a line parallel to the X axis or the Y axis, and the angle is unequal to 0 degrees, 90 degrees, or 180 degrees to avoid a Moiré phenomenon being generated between the touch panel and the pixel layout. 
       EMBODIMENTS 
       [0025]    1. A touch panel, comprising a plurality of touch units, each the touch unit comprises: 
         [0026]    a first driving line; 
         [0027]    a second driving line; 
         [0028]    a first sensing line; and 
         [0029]    a second sensing line, 
         [0030]    wherein the touch panel is configured on an LCD having a pixel layout, the pixel layout has a black matrix with an X axis and a Y axis, each of the first driving line, the second driving line, the first sensing line and the second sensing line has an edge with a plurality of turning angles, and each the edge is unparallel to either one of the X axis and the Y axis. 
         [0031]    2. A touch panel according to Embodiment 1, wherein the second sensing line connects to the first sensing line at a cross-node of the X and the Y axes, each the touch unit further includes an isolation layer and a metal line, each the isolation layer is configured on the corresponding cross-node of the X and the Y axes, each the metal line is configured on the corresponding isolation layer and electrically connected to the first and the second driving lines, each the isolation layer is used to correspondingly isolate the first and the second driving lines and the first and the second sensing lines, each the turning angle of each the edge is an angle between a respective line parallel to one of the X axis and the Y axis, and the corresponding edge, and the angle is unequal to one being selected from a group consisting of 0 degrees, 90 degrees and 180 degrees so as to avoid a Moiré phenomenon being generated between the touch panel and the pixel layout. 
         [0032]    3. A touch panel according to Embodiment 1 or 2, wherein each the angle is between 20 degrees and 150 degrees, and unequal to 90 degrees, and each the edge is a curve. 
         [0033]    4. A touch panel according to any one of the above-mentioned Embodiments, wherein each the touch unit further includes a first modifying area between the first sensing line and the first driving line, a second modifying area between the first sensing line and the second driving line, a third modifying area between the second sensing line and the first driving line, a fourth modifying area between the second sensing line and the second driving line, and each of the first to the fourth modifying areas includes one of zero auxiliary blocks and at least one auxiliary block. 
         [0034]    5. A touch panel according to any one of the above-mentioned Embodiments, wherein when each of the first to the fourth modifying areas includes the at least one auxiliary block, there is a first conducting layer-free area among the first sensing line, the first modifying area, the first driving line, the third modifying area and the second sensing line, and there is a second conducting layer-free area among the first sensing line, the second modifying area, the second driving line, the fourth modifying area and the second sensing line; when the first modifying area includes zero auxiliary blocks, the first modifying area is a part of the first sensing line; when the second modifying area includes zero auxiliary blocks, the second modifying area is a further part of the first sensing line; when the third modifying area includes zero auxiliary blocks, the third modifying area is a part of the second sensing line; and when the fourth modifying area includes zero auxiliary blocks, the fourth modifying area is a further part of the second sensing line. 
         [0035]    6. A touch panel according to any one of the above-mentioned Embodiments, wherein the first and the second driving lines, the first and the second sensing lines, and each of the at least one auxiliary block are formed by a transparent conducting film. 
         [0036]    7. A touch panel, comprising a plurality of touch units, each the touch unit comprises: 
         [0037]    a first driving line; and 
         [0038]    a first sensing line, 
         [0039]    wherein the touch panel is configured on an LCD having a pixel layout, the pixel layout has a black matrix with an X axis and a Y axis, each of the first driving line and the first sensing line has an edge with a plurality of turning angles, and each the edge is unparallel to either one of the X axis and the Y axis. 
         [0040]    8. A touch panel according to Embodiment 7, further comprising a second driving line and a second sensing line, wherein each of the second driving line and the second sensing line has an edge with a plurality of turning angles, and each the edge of the second driving line and the second sensing line is also unparallel to either one of the X axis and the Y axis to avoid a Moiré phenomenon being generated between the touch panel and the pixel layout. 
         [0041]    9. A touch panel according to Embodiment 7 or 8, wherein each the turning angle of each the edge is an angle between each the edge and a line parallel to one of the X axis and the Y axis, and the angle is unequal to one being selected from a group consisting of 0 degrees, 90 degrees and 180 degrees. 
         [0042]    10. A touch panel, being configured on an LCD having a pixel layout, wherein the pixel layout has a black matrix with an X axis and a Y axis, the touch panel has a plurality of touch units, each the touch unit includes a plurality of electrode lines, each the electrode line has an edge, and each the edge is unparallel to either one of the X axis and the Y axis. 
         [0043]    11. A method for eliminating a Moiré phenomenon on a touch panel, comprising: 
         [0044]    providing an LCD having a pixel layout, and the touch panel having a plurality of touch units, wherein the pixel layout has a black matrix with an X axis and a Y axis, each the touch unit includes a first driving line, a second driving line, a first sensing line and a second sensing line, and each of the lines has an edge including a plurality of turning angles; and 
         [0045]    causing each the edge unparallel to either one of the X axis and the Y axis to avoid the Moiré phenomenon generated between the touch panel and the pixel layout. 
         [0046]      12 . A method for eliminating a Moiré phenomenon on a screen, wherein the screen includes a touch panel and an LCD, the LCD has a pixel layout, the pixel layout has a black matrix with an X axis and a Y axis, the touch panel includes a plurality of touch units, and the method comprises: 
         [0047]    providing a plurality of electrode lines for each the touch unit, each the electrode line has an edge; and 
         [0048]    causing each the edge unparallel to either one of the X axis and the Y axis. 
         [0049]    According to the aforementioned descriptions, the present invention discloses patterns on a touch panel using a design unparallel to either one of the X axis and the Y axis of a pixel layout of the LCD to resolve the Moiré optical phenomenon resulting from the interference between the touch panel and the pixel layout to demonstrate the non-obviousness and novelty. 
         [0050]    While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiments. Therefore, it is intended to cover various modifications and similar configuration included within the spirit and scope of the appended claims, which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.