Patent Publication Number: US-2018045998-A1

Title: Array substrate and liquid crystal display panel

Description:
FIELD OF THE INVENTION 
     The present invention relates to a technological field of liquid crystal displays, and more particularly to an array substrate and a liquid crystal display panel. 
     BACKGROUND OF THE INVENTION 
     With the technological development of the society, liquid crystal display devices are used by more and more users. For improving the displaying effect of the liquid crystal display devices, liquid crystal display panels of liquid crystal display devices are designed as multi-domain displays, so as to expand the viewing angle of the liquid crystal display panels. 
     Refer to  FIG. 1 , which is a structural schematic view of a conventional liquid crystal display panel. A liquid crystal display panel  10  comprises a color filter substrate  11 , an array substrate  12 , and a liquid crystal layer  13  located between the color filter substrate  11  and the array substrate  12 , wherein an inner surface of the array substrate  12  is provided with a plurality of pixel electrodes  14 . Refer to  FIG. 2 , which is a cross section view of a cross section line A-A′ of  FIG. 1 . As shown in  FIG. 2 , each of the pixel electrodes  14  comprises a pixel-electrode-main-trunk  141  and a plurality of pixel-electrode-branches  142  extending in four different directions, and thereby a four-domain display of the liquid crystal display panel  10  is accomplished. 
     The trace-width and the trace-gap of the pixel-electrode-branches  142  of the conventional pixel electrodes  14  are both constants. For example, the trace-width of each of the pixel-electrode-branches  142  is 3.5 micrometers, and the trace-gap between the two adjacent pixel-electrode-branches  142  is 3 micrometers. 
     The conventional design for the pixel-electrode-branches  142  is a design of an equal trace-width and equal trace-gap, so that it can simplify the design of the pixel-electrode-branches  142 , and the manufacture and detection of the pixel-electrode-branches  142  is more convenient. However, the above-mentioned design for the pixel-electrode-branches  142  does not consider an uneven property of the electric field in the intersection of the pixel-electrode-branches  142 . Thus, the uneven electric field easily lowers the whole display effect of the liquid crystal display panel, and the display quality of the liquid crystal display panel  10  is influenced. 
     Hence, it is necessary to provide an array substrate and a liquid crystal display panel which solves the problem existing in the conventional technology. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is to provide an array substrate and a liquid crystal display panel, which can increase the display effect and the display quality of the liquid crystal display panel, so as to solve a technical problems that the display effect and display quality is lower in the conventional array substrate and the liquid crystal display panel. 
     For solving the above-mentioned technical problems, the present invention provides a technical solution as follows: 
     A preferred embodiment of the present invention provides an array substrate, which comprises:
         a substrate;   a plurality of data lines disposed on the substrate and being configured to transmit a data signal;   a plurality of scan lines disposed on the substrate and being configured to transmit a scan signal; and   a plurality of pixel units formed by crisscrossing the data lines and the scan lines, wherein each of the pixel units comprises a pixel electrode disposed on an inner surface the array substrate;   wherein each of the pixel electrodes comprises at least one pixel-electrode-main-trunk and a plurality of pixel-electrode-branches extending from the pixel-electrode-main-trunk; a trace-width of the pixel-electrode-branch in a middle area is greater than a trace-width of the pixel-electrode-branch in an edge area.       

     In the array substrate of the present invention, a trace-gap of the pixel-electrode-branch in the middle area is smaller than a trace-gap of the pixel-electrode-branch in the edge area. 
     In the array substrate of the present invention, the trace-widths are designed according to the distances between the pixel-electrode-branches and the edges of the pixel units. 
     In the array substrate of the present invention, the trace-gaps are designed according to the distances between the pixel-electrode-branches and the edges of the pixel units. 
     In the array substrate of the present invention, the sum of the trace-width of the pixel-electrode-branch and the trace-gap of the pixel-electrode-branch in the middle area is equal to the sum of the trace-width of the pixel-electrode-branch and the trace-gap of the pixel-electrode-branch in the edge area. 
     In the array substrate of the present invention, the array substrate is a COA (color filter on array) substrate, which has a color filter thereon. 
     A preferred embodiment of the present invention further provides an array substrate, which comprises:
         a substrate;   a plurality of data lines disposed on the substrate and being configured to transmit a data signal;   a plurality of scan lines disposed on the substrate and being configured to transmit a scan signal; and   a plurality of pixel units formed by crisscrossing the data lines and the scan lines, wherein each of the pixel units comprises a pixel electrode disposed on an inner surface the array substrate;   wherein each of the pixel electrodes comprises at least one pixel-electrode-main-trunk and a plurality of pixel-electrode-branches extending from the pixel-electrode-main-trunk; a trace-gap of the pixel-electrode-branch in a middle area is smaller than a trace-gap of the pixel-electrode-branch in an edge area.       

     In the array substrate of the present invention, the trace-gaps are designed according to the distances between the pixel-electrode-branches and the edges of the pixel units. 
     In the array substrate of the present invention, the sum of the trace-width of the pixel-electrode-branch and the trace-gap of the pixel-electrode-branch in the middle area is equal to the sum of the trace-width of the pixel-electrode-branch and the trace-gap of the pixel-electrode-branch in the edge area. 
     In the array substrate of the present invention, the array substrate is a COA substrate, which has a color filter thereon. 
     A preferred embodiment of the present invention provides a liquid crystal display panel, which comprises an array substrate, a color filter substrate, and a liquid crystal layer located between the array substrate and the color filter substrate, wherein the array substrate comprises:
         a substrate;   a plurality of data lines disposed on the substrate and being configured to transmit a data signal;   a plurality of scan lines disposed on the substrate and being configured to transmit a scan signal; and   a plurality of pixel units formed by crisscrossing the data lines and the scan lines, wherein each of the pixel units comprises a pixel electrode disposed on an inner surface the array substrate;   wherein each of the pixel electrodes comprises at least one pixel-electrode-main-trunk and a plurality of pixel-electrode-branches extending from the pixel-electrode-main-trunk; and a trace-width of the pixel-electrode-branch in a middle area is greater than a trace-width of the pixel-electrode-branch in an edge area.       

     In the liquid crystal display panel of the present invention, a trace-gap of the pixel-electrode-branch in the middle area is smaller than a trace-gap of the pixel-electrode-branch in the edge area. 
     In the liquid crystal display panel of the present invention, the trace-widths are designed according to the distances between the pixel-electrode-branches and the edges of the pixel units. 
     In the liquid crystal display panel of the present invention, the trace-gaps are designed according to the distances between the pixel-electrode-branches and the edges of the pixel units. 
     In the liquid crystal display panel of the present invention, the sum of the trace-width of the pixel-electrode-branch and the trace-gap of the pixel-electrode-branch in the middle area is equal to the sum of the trace-width of the pixel-electrode-branch and the trace-gap of the pixel-electrode-branch in the edge area. 
     In the liquid crystal display panel of the present invention, the array substrate is a COA substrate, which has a color filter thereon. 
     Compared with a conventional array substrate and liquid crystal display panel, in the array substrate and the liquid crystal display panel of the preferred embodiment, by disposing the pixel-electrode-branches having different trace-widths and trace-gaps, it can increase the display effect of the liquid crystal display panel, and meanwhile improve the display quality of the liquid crystal display panel, and the thereby the technical problems that the display effect and display quality is lower in the conventional array substrate and the liquid crystal display panel is solved. 
     The above-mention contents of the present invention can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a structural schematic view of a conventional liquid crystal display panel; 
         FIG. 2  is a cross section view of a cross section line A-A′ of  FIG. 1 ; 
         FIG. 3  is a structural schematic view of a pixel unit of an array substrate according to a first preferred embodiment of the present invention; 
         FIG. 4  is a structural schematic view of a pixel unit of an array substrate according to a second preferred embodiment of the present invention; and 
         FIG. 5  is a structural schematic view of a pixel unit of an array substrate according to a third preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The foregoing objects, features, and advantages adopted by the present invention can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings. Furthermore, the directional terms described in the present invention, such as upper, lower, front, rear, left, right, inner, outer, side, etc., are only directions with reference to the accompanying drawings, so that the used directional terms are used to describe and understand the present invention, but the present invention is not limited thereto. In the drawings, units with similar structures use the same numerals. 
     Refer to  FIG. 3 , which is a structural schematic view of a pixel unit of an array substrate according to a first preferred embodiment of the present invention. An array substrate  30  of the preferred embodiment comprise a substrate (not shown), data lines  31 , scan lines  32 , and pixel units  33 . The data lines  31  are disposed on the substrate, and configured to transmit a data signal; the scan lines  32  are also disposed on the substrate, and configured to transmit a scan signal; and the pixel units  33  are formed by crisscrossing the data lines  31  and the scan lines  32 , and each of the pixel units  33  comprises a pixel electrode  34  disposed on an inner surface of the array substrate  30 . 
     Refer to  FIG. 3 , each of the pixel electrodes  34  comprises at least one pixel-electrode-main-trunk  341  and a plurality of pixel-electrode-branches  342  extending from the pixel-electrode-main-trunk  341 . One of the pixel electrodes  34  can comprise four of the pixel-electrode-branches  342  extending in four different directions, and thereby a multi-domain display of a liquid crystal display panel is accomplished. 
     In the preferred embodiment, on the same display domain of the pixel unit  33 , a trace-width of the pixel-electrode-branch  342  in a middle area is greater than a trace-width of the pixel-electrode-branch  342  in an edge area. That is, the trace-widths are designed according to the distances between the pixel-electrode-branches  342  and the edges of the pixel units  33 . Additionally, on the same display domain of the pixel units  33 , the trace-gaps between the adjacent pixel-electrode-branches  342  are the same. Here the trace-width is the breadth of the pixel-electrode-branch  342 , and the trace-gap is the distance between two the adjacent pixel-electrode-branches  342 . As shown in  FIG. 3 , a trace-width a 3  is greater than a trace-width a 2 ; the trace-width a 2  is greater than a trace-width a 1 ; the trace-width a 3  is greater than a trace-width a 4 ; and the trace-width a 4  is greater than a trace-width a 5 . For example, the trace-width a 1 , trace-width a 2 , trace-width a 3 , trace-width a 4 , and trace-width a 5  are respectively 3.1 micrometers, 3.3 micrometers, 3.5 micrometers, 3.3 micrometers, and 3.1 micrometers. In  FIG. 3 , a trace-gap b 1 , a trace-gap b 2 , a trace-gap b 3 , and a trace-gap b 4  are equal. For example, the trace-gap b 1 , the trace-gap b 2 , the trace-gap b 3 , and the trace-gap b 4  are all 3 micrometers. 
     When a liquid crystal display panel corresponding to the array substrate  30  of the preferred embodiment is used, by a gradual change of the trace-widths, from the trace-width of the pixel-electrode-branch  342  in the middle area to the trace-width of the pixel-electrode-branch  342  in the edge area, it can compensate an uneven property of the electric field in the intersection of the pixel-electrode-branches  342 . That is, the electric field generated by the display domain of the pixel-electrode-branches  342  can be more even, so as to improve the display quality of the liquid crystal display panel. 
     Preferably, the array substrate  30  can be an array substrate which only has the pixel electrodes thereon, but can also be a COA (color filter on array) substrate, which further has a color filter thereon. 
     In the array substrate of the preferred embodiment, by disposing the pixel-electrode-branches having different trace-widths, it can increase the display effect of the liquid crystal display panel, and meanwhile improve the display quality of the liquid crystal display panel. 
     Refer to  FIG. 4 , which is a structural schematic view of a pixel unit of an array substrate according to a second preferred embodiment of the present invention. An array substrate  40  of the preferred embodiment comprises a substrate (not shown), data lines  41 , scan lines  42 , and pixel units  43 . The data lines  41  are disposed on the substrate, and configured to transmit a data signal; the scan lines  42  are also disposed on the substrate, and configured to transmit a scan signal; and the pixel units  43  are formed by crisscrossing the data lines  41  and the scan lines  42 , and each of the pixel units  43  comprises a pixel electrode  44  disposed on an inner surface of the array substrate  40 . 
     Refer to  FIG. 4 , each of the pixel electrodes  44  comprises at least one pixel-electrode-main-trunk  441  and a plurality of pixel-electrode-branches  442  extending from the pixel-electrode-main-trunk  441 . One of the pixel electrode  44  can comprise four of the pixel-electrode-branches  442  extending in four different directions, and thereby a multi-domain display of a liquid crystal display panel is accomplished. 
     In the preferred embodiment, on the same display domain of the pixel unit  43 , a trace-gap of the pixel-electrode-branch  442  in a middle area is smaller than a trace-gap of the pixel-electrode-branch  442  in an edge area. That is, the trace-gaps are designed according to the distances between the pixel-electrode-branches  442  and the edges of the pixel units  43 . Additionally, on the same display domain of the pixel units  43 , the trace-widths between the adjacent pixel-electrode-branches  342  are the same. Here the trace-width is the breadth of the pixel-electrode-branch  442 , and the trace-gap is the distance between two the adjacent pixel-electrode-branches  442 . As shown in  FIG. 4 , a trace-width c 1 , a trace-width c 2 , a trace-width c 3 , and a trace-width c 4  are equal. For example, the trace-width c 1 , the trace-width c 2 , the trace-width c 3 , and the trace-width c 4  are all 3.5 micrometers. In  FIG. 4 , a trace-gap d 1  is greater than a trace-gap d 2 ; and a trace-gap d 4  is greater than a trace-gap d 3 . For example, the trace-gap d 1 , trace-gap d 2 , trace-gap d 3 , and trace-gap d 4  are respectively 3 micrometers, 2.7 micrometers, 2.7 micrometers, and 3 micrometers. 
     When a liquid crystal display panel corresponding to the array substrate  40  of the preferred embodiment is used, by a gradual change of the trace-gaps, from the trace-gap of the pixel-electrode-branch  442  in the middle area to the trace-gap of the pixel-electrode-branch  442  in the edge area, it can compensate an uneven property of the electric field in the intersection of the pixel-electrode-branches  442 . That is, the electric field generated by the display domain of the pixel-electrode-branches  442  can be more even, so as to improve the display quality of the liquid crystal display panel. 
     Preferably, the array substrate  40  can be an array substrate which only has the pixel electrodes thereon, but also can be a COA (color filter on array) substrate, which further has a color filter thereon. 
     In the array substrate of the preferred embodiment, by disposing the pixel-electrode-branches having different trace-gaps, it can increase the display effect of the liquid crystal display panel, and meanwhile improve the display quality of the liquid crystal display panel. 
     Refer to  FIG. 5 , which is a structural schematic view of a pixel unit of an array substrate according to a third preferred embodiment of the present invention. An array substrate  50  of the preferred embodiment comprise a substrate (not shown), data lines  51 , scan lines  52 , and pixel units  53 . The data lines  51  are disposed on the substrate, and configured to transmit a data signal; the scan lines  52  are also disposed on the substrate, and configured to transmit a scan signal; and the pixel units  53  are formed by crisscrossing the data lines  51  and the scan lines  52 , and each of the pixel units  53  comprises a pixel electrode  54  disposed on an inner surface of the array substrate  50 . 
     Refer to  FIG. 5 , each of the pixel electrodes  54  comprises at least one pixel-electrode-main-trunk  541  and a plurality of pixel-electrode-branches  542  extending from the pixel-electrode-main-trunk  541 . One of the pixel electrodes  54  can comprises four of the pixel-electrode-branches  542  extending in four different directions, and thereby a multi-domain display of a liquid crystal display panel is accomplished. 
     In the preferred embodiment, on the same display domain of the pixel unit  53 , a trace-width of the pixel-electrode-branch  542  in a middle area is greater than a trace-width of the pixel-electrode-branch  542  in an edge area; and a trace-gap of the pixel-electrode-branch  542  in the middle area is smaller than a trace-gap of the pixel-electrode-branch  542  in the edge area. Here the trace-width is the breadth of the pixel-electrode-branch  542 , and the trace-gap is the distance between two the adjacent pixel-electrode-branches  542 . As shown in  FIG. 5 , a trace-width e 3  is greater than a trace-width e 2 ; the trace-width e 2  is greater than a trace-width e 1 ; the trace-width e 3  is greater than a trace-width e 4 ; and the trace-width e 4  is greater than a trace-width e 5 . For example, the trace-width e 1 , trace-width e 2 , trace-width e 3 , trace-width e 4 , and trace-width e 5  are respectively 3.1 micrometers, 3.3 micrometers, 3.5 micrometers, 3.3 micrometers, and 3.1 micrometers. In  FIG. 3 , a trace-gap f 1  is greater than a trace-gap f 2 ; and a trace-gap f 4  is greater than a trace-gap f 3 . For example, the trace-gap f 1 , trace-gap f 2 , trace-gap f 3 , and trace-gap f 4  are respectively 3 micrometers, 2.7 micrometers, 2.7 micrometers, and 3 micrometers. 
     When a liquid crystal display panel corresponding to the array substrate  50  of the preferred embodiment is used, by a gradual change of the trace-widths, from the trace-width of the pixel-electrode-branch  542  in the middle area to the trace-width of the pixel-electrode-branch  542  in the edge area, and a gradual change of the trace-gaps, from the trace-gap of the pixel-electrode-branch  542  in the middle area to the trace-gap of the pixel-electrode-branch  542  in the edge area, it can compensate an uneven property of the electric field in the intersection of the pixel-electrode-branches  542 . That is, the electric field generated by the display domain of the pixel-electrode-branches  542  can be more even, so as to improve the display quality of the liquid crystal display panel. 
     Preferably, the sum of the trace-width of the pixel-electrode-branch  542  and the trace-gap of the pixel-electrode-branch  542  in the middle area is equal to the sum of the trace-width of the pixel-electrode-branch  542  and the trace-gap of the pixel-electrode-branch  542  in the edge area. In the preferred embodiment, the sum of trace-width e 1  and trace-gap f 1  is 6.1 micrometers; the sum of trace-width e 2  and trace-gap f 2  is 6.1 micrometers; the sum of trace-width e 4  and trace-gap f 3  is 6.1 micrometers; and the sum of trace-width e 5  and trace-gap f 4  is 6.1 micrometers. When the sum of the trace-width of the pixel-electrode-branch  542  and the trace-gap of the pixel-electrode-branch  542  in the middle area is equal to the sum of the trace-width of the pixel-electrode-branch  542  and the trace-gap of the pixel-electrode-branch  542  in the edge area, it can obtain the best even property of the electric field in the intersection of the pixel-electrode-branches  342 , and improve the display effect and display quality of the liquid crystal display panel. 
     The present invention further provides a liquid crystal display panel, which comprises an array substrate, a color filter substrate, and a liquid crystal layer located between the array substrate and the color filter substrate. The array substrate comprises a substrate, a plurality of data lines, a plurality of scan lines, and a plurality of pixel units, wherein the data lines are disposed on the substrate and configured to transmit a data signal; the scan lines are disposed on the substrate and configured to transmit a scan signal; and the pixel units are formed by crisscrossing the data lines and the scan lines, and each of the pixel units comprises a pixel electrode disposed on an inner surface the array substrate. 
     In the preferred embodiment, each of the pixel electrodes comprises at least one pixel-electrode-main-trunk and a plurality of pixel-electrode-branches extending from the pixel-electrode-main-trunk. One of the pixel electrodes can comprise four of the pixel-electrode-branches extending in four different directions, and thereby a multi-domain display of a liquid crystal display panel is accomplished. 
     Preferably, a trace-width of the pixel-electrode-branch in the middle area is greater than a trace-width of the pixel-electrode-branch in the edge area. 
     Preferably, a trace-gap of the pixel-electrode-branch in the middle area is smaller than a trace-gap of the pixel-electrode-branch in the edge area. 
     Preferably, the sum of the trace-width of the pixel-electrode-branch and the trace-gap of the pixel-electrode-branch in the middle area is equal to the sum of the trace-width of the pixel-electrode-branch and the trace-gap of the pixel-electrode-branch in the edge area. 
     The specific operation principle of the liquid crystal display device of the present invention is the same or similar to the description of the above-mentioned embodiments, so please refer to the related description of the above-mentioned embodiments. 
     In the array substrate and the liquid crystal display panel of the preferred embodiment, by disposing the pixel-electrode-branches having different trace-widths and trace-gaps, it can increase the display effect of the liquid crystal display panel, and meanwhile improve the display quality of the liquid crystal display panel, and the thereby the technical problems that the display effect and display quality is lower in the conventional array substrate and the liquid crystal display panel is solved. 
     The present invention has been described with preferred embodiments thereof and it is understood that many changes and modifications to the described embodiments can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims.