Patent Publication Number: US-2023161206-A1

Title: Liquid crystal display panel

Description:
BACKGROUND OF INVENTION 
     Field of Invention 
     The present invention relates to the field of display technology, and more particularly, to a liquid crystal display panel. 
     Description of Prior Art 
     In a conventional pixel structure, a black matrix (BM) is usually disposed above data lines to shield light, thereby improving a contrast of a display panel. However, alignment accuracy of upper and lower substrates often deviates during manufacturing of the display panel, causing the black matrix to move left and right, which in turn causes data lines to leak light. Current pixel structure adopts data line BM-less (DBS) technology, which removes the black matrix above the data line, forms a DBS electrode above the data line, and makes the DBS electrode and the common electrode on the color filter substrate have a same electric potential, so corresponding liquid crystal molecules above the data line are always kept in an undeflected state, thereby functioning as a light shield. In addition, the DBS electrode and the data line are disposed on an array substrate, lessening deviations in alignment, and light leakage caused by movement of the black matrix can be prevented. 
     However, in the pixel structure, the DBS electrode is always overlapped with the data line, so parasitic capacitance of the data line is high, which limits its application in high-frequency and large-sized display panels. 
     SUMMARY OF INVENTION 
     In one embodiment, a liquid crystal display panel is provided to solve problem in the liquid crystal display panel of the prior art. The problem is that forming DBS electrode above the data line to shield light, the DBS electrode always coincides with the data line, resulting in a high parasitic capacitance of the data line, which in turn affects the technical problems of its application in high-frequency and large-sized display panels. 
     In one embodiment, a liquid crystal display panel comprises a color filter substrate, an array substrate disposed opposite to the color filter substrate, a liquid crystal layer interposed between the color filter substrate and the array substrate, a black matrix disposed on a side of the color filter substrate facing the array substrate, and a pixel electrode is disposed on the array substrate, wherein the DBS electrode and the pixel electrode are disposed on a same level layer. The array substrate comprises a plurality of data lines and a plurality of data line black matrix less (DBS) electrodes disposed above the data lines. The DBS electrode comprises at least one slit-shaped opening disposed at intervals. The black matrix covers the slit-shaped opening corresponding the black matrix. 
     In one embodiment, a width of the black matrix is greater than or equal to a width of the data line. 
     In one embodiment, at least one orthographic projection of the slit-shaped opening on the data line is located on the center line in an extending direction of the data line. 
     In one embodiment, the slit-shaped opening comprises a rectangular shape. 
     In one embodiment, a length of the slit-shaped opening ranges from 5 microns to 20 microns, and a width of the slit-shaped opening ranges from 2.5 microns to one-third of a width of the data line. 
     In one embodiment, a width of the DBS electrode is greater than a width of the data line. 
     In one embodiment, two adjacent DBS electrodes are connected by a bridge wire, and the DBS electrode and the bridge wire are disposed on a same level layer. 
     In one embodiment, the color filter substrate further comprises a common electrode, and the common electrode and the DBS electrode have a same electric potential. 
     In one embodiment, at least one orthographic projection of the slit-shaped opening on the data line is located on the center line in the extending direction of the data line. 
     In one embodiment, the slit-shaped opening comprises a rectangular shape. 
     In one embodiment, a length of the slit-shaped opening ranges from 5 microns to 20 microns, and the width of the slit-shaped opening ranges from 2.5 microns to one-third of the width of the data line. 
     In one embodiment, a width of the DBS electrode is greater than a width of the data line. 
     In one embodiment, two adjacent DBS electrodes are connected by a bridge wire, and the DBS electrode and the bridge wire are disposed on a same level layer. 
     In one embodiment, the color filter substrate further comprises a common electrode, and the common electrode and the DBS electrode have a same electric potential. 
     A liquid crystal display panel comprises a color filter substrate, an array substrate disposed opposite to the color filter substrate, and a liquid crystal layer interposed between the color filter substrate and the array substrate. The array substrate comprises a plurality of data lines and a plurality of data line black matrix less (DBS) electrodes disposed above the data lines. The DBS electrode comprises at least one slit-shaped opening disposed at intervals. 
     In one embodiment, a black matrix is disposed on a side of the color filter substrate facing the array substrate, and the black matrix covers the slit-shaped opening corresponding the black matrix. 
     In one embodiment, a width of the black matrix is greater than or equal to a width of the data line. 
     In one embodiment, at least one orthographic projection of the slit-shaped opening on the data line is located on a center line in an extending direction of the data line. 
     In one embodiment, the slit-shaped opening comprises a rectangular shape. 
     In one embodiment, wherein a length of the slit-shaped opening ranges from 5 microns to 20 microns, and the width of the slit-shaped opening ranges from 2.5 microns to one-third of the width of the data line. 
     In one embodiment, a width of the DBS electrode is greater than a width of the data line. 
     In one embodiment, a pixel electrode is disposed on the array substrate, and the DBS electrode and the pixel electrode are disposed on a same level layer. 
     In one embodiment, two adjacent DBS electrodes are connected by a bridge wire, and the DBS electrode and the bridge wire are disposed on a same level layer. 
     In one embodiment, the color filter substrate further comprises a common electrode, and the common electrode and the DBS electrode have a same electric potential. 
     By forming at least one slit-shaped opening on the DBS electrode above the data line, and keeping the black matrix above the data line to shield the slit-shaped opening, thereby solving the problem of data line the pixel structure, such as the parasitic capacitance of the data line is high due to the data line always overlapping the DBS electrode pixel structure of the prior art. Accordingly, it is beneficial to the application of the DBS electrode in high-frequency and large-sized display panels. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       In order to more clearly illustrate the technical solutions in the embodiments, the drawings described in the description of the embodiments are briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings can also be obtained from those skilled persons in the art based on drawings without any creative effort. 
         FIG.  1    is a schematic structural view of a liquid crystal display panel according to one embodiment of the present invention. 
         FIG.  2    is a schematic structural view of a DBS electrode and a pixel electrode according to one embodiment of the present invention. 
         FIG.  3    is a schematic structural view of a DBS electrode according to one embodiment of the present invention. 
         FIG.  4    is a schematic structural view of a DBS electrode according to another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work fall within the claimed scope of the present application. 
     In the description of this application, it should be understood that the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise,” etc. The positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it cannot be understood as a limitation to this application. In addition, the terms “first” and “second” are used for description purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as “first” and “second” may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of “plurality” is two or more, unless otherwise specifically limited. 
     In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms “installation”, “link”, and “connection” should be understood in a broad sense, for example, it can be fixed connection or detachable Connected, or integrally connected; may be mechanical, electrical, or may communicate with each other; may be directly connected, or may be indirectly connected through an intermediary, may be the connection between two elements or the interaction of two elements relationship. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations. 
     In this application, unless otherwise clearly specified and defined, the first feature “above” or “below” the second feature may include the first and second features in direct contact, or may include the first and second features Contact not directly but through another feature between them. Moreover, the first feature is “above”, “over”, and “on” the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature is “below”, “under”, and “underneath” the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is less horizontal than the second feature. 
     In this application, unless otherwise clearly specified and defined, the first feature “above” or “below” the second feature may include the first and second features in direct contact, or it may also include that the first and second features are not in direct contact but are in contact with another feature between them. Moreover, the first feature is “above”, “on” and “over” the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature is “below”, “under” and “underneath” the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is less horizontal than the second feature. 
     The following disclosure provides many different implementations or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit this application. In addition, the present application may repeat reference numerals and/or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and/or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and/or the use of other materials. 
     Referring to  FIG.  1   , a liquid crystal display panel  100  is provided, and the liquid crystal display panel  100  includes a color filter substrate  20 , an array substrate  10 , and a liquid crystal layer  30 . The color filter substrate  20  is disposed opposite to an array substrate  10 . The liquid crystal layer  30  is interposed between the color filter substrate  20  and the array substrate  10 . The array substrate  10  includes a plurality of data lines  12  and a plurality of data line black matrix less (DBS) electrodes disposed above the data lines  12 . 
     A width of the DBS electrode  14  is greater than a width of the data line  12 . Each DBS electrode  14  is correspondingly disposed above each of the data line  12 . 
     Referring to  FIG.  2   , two adjacent DBS electrodes  14  are connected by a bridge wire  16 , and the DBS electrode  14  and the common electrode  23  on the color filter substrate  20  have a same electric potential. Therefore, the liquid crystal molecules corresponding to the data line  12  are always kept in an undeflected state, thereby functioning as a light shield. 
     However, in the prior art, the DBS electrode completely coincides with the data line in the thickness direction, resulting in a high parasitic capacitance of the data line, which limits the application of the DBS electrode in high-frequency and large-sized panels. A slit-shaped opening  141  is formed on the DBS electrode  14  to solve the above-mentioned defects through changing the structure of the DBS electrode. 
     The DBS electrode  14  includes at least one slit-shaped opening  141  disposed at intervals. The slit-shaped opening  141  may reduce the overlapping area of the DBS electrode  14  and the data line  12 , thereby reducing the parasitic capacitance of the data line  12 . 
     The DBS electrode  14  is provided with the slit-shaped opening  141 . In order to further enhance the shielding effect, a black matrix  22  is disposed on the side of the color filter substrate  20  facing the array substrate  10 , and the black matrix  22  covers the slit-shaped opening  141  corresponding the black matrix  22 , thereby making up for insufficient shielding caused by the slit-shaped opening  141 . 
     When the color filter substrate  20  is aligned with the array substrate  10 , the black matrix may move left and right due to deviation in alignment accuracy, so the width of the black matrix  22  may be set to be greater than or equal to the width of the data line  12 . 
     Furthermore, referring to  FIG.  3   , due to limitation of the alignment accuracy of the black matrix  22 , at least one orthographic projection of the slit-shaped opening  141  on the data line  12  is located on the center line  121  in the extending direction of the data line  12 . Therefore, light leakage at the slit-shaped opening  141  is at the center of the data line, and the light leakage at this part is covered by the black matrix  22 , and even if the alignment of the black matrix  22  shifts, the black matrix  22  may cover the slit-shaped opening  141 . 
     The data line  12  and the DBS electrode  14  are both disposed on the array substrate  10 , and the deviation of the alignment accuracy is less. Therefore, at least one of the slit-shaped openings  141  may be disposed at intervals on the centerline of the extending direction of the DBS electrode  14 , the slit-shaped opening  141  is formed by forming a hole in the center of the DBS electrode  14 . 
     The plurality of slit-shaped openings  141  may be formed at equal intervals, and a distance between two adjacent slit-shaped openings  141  depends on actual design needs, and is not limited herein. 
     The distance between two adjacent slit-shaped openings  141  may be zero. At this time, only one slit-shaped opening  141  is formed on the DBS electrode  14 . 
     The slit-shaped opening  141  penetrates the upper and lower surfaces of the DBS electrode  14 . 
     The extending direction (longitudinal direction) of the slit-shaped opening  141  is the same as the extending direction of the DBS electrode  14 . The slit-shaped opening  141  is a closed-shaped opening to prevent the slit-shaped opening  141  from being formed at the edge of the DBS electrode, thereby ensuring the shielding ability of the edge of the DBS electrode  14  to compensate for the light leakage caused by the movement of the black matrix  22 . 
     In one embodiment, the slit-shaped opening  141  is a rectangular shape. In other embodiments, as shown in  FIG.  4   , the slit-shaped opening  141  is an elliptical shape, and may also have other shapes, such as a triangle, a circle, and a square. 
     The width of the slit-shaped opening  141  cannot be too wide, so it may avoid light leakage at the edge of the DBS electrode. The specific size of the slit-shaped opening  141  depends on the actual pixel size and the width of the data line. 
     When the slit-shaped opening  141  is a rectangular shape, the length of the slit-shaped opening  141  ranges from 5 microns to 20 microns. The width of the slit-shaped opening ranges from 2.5 microns to one-third of the width of the data line. Specifically, in this embodiment, a length of the slit-shaped opening is 10 microns and a width of the slit-shaped opening is 3 microns. 
     When the slit-shaped opening  141  is a triangular shape, the height of the triangle may be the same as the length of the rectangle, and the width of the triangle may be the same as the width of the rectangle. An opening area of the triangular shape is not as large as that of the rectangular shape and the degree of reducing the parasitic capacitance is not as obvious as that of the rectangular shape, but the contrast ratio is higher than that of the rectangular opening. 
     The array substrate  10  is further provided with a pixel electrode  15 . The DBS electrode  14  and the pixel electrode  15  are disposed on a same level layer, and the pixel electrode  15  and the DBS electrode  14  may be formed through the same patterning process. 
     Two adjacent DBS electrodes  14  may be connected by a bridge wire  16 . When the DBS electrodes  14  and the bridge wire  16  are disposed on different level layers, the bridge wire  16  may connect the two DBS electrodes  14  through via holes. When the DBS electrode and the bridge wire  16  are disposed on the same level layer, the bridge wire  16  may directly connect the two DBS electrodes. 
     In this embodiment, the array substrate  10  includes a first substrate  11 , a data line  12  disposed on the first substrate  11 , a source and a drain disposed on the same level layer as the data line  12  (not shown), an insulating layer  13  disposed on the data line  12 , and a plurality of DBS electrodes  14  and pixel electrodes  15  are disposed on the insulating layer and the same level layer. The array substrate  10  further includes a gate, a scanning line, an active layer, etc., which may refer to the prior art, and will not be described herein. 
     When the DBS electrode  14 , the bridge wire  16 , and the pixel electrode  15  are disposed on the same level layer, the pixel electrode  15  includes a main pixel electrode and a sub-pixel electrode. The main pixel electrode and the sub-pixel electrode are spaced apart. The bridge wire  16  is disposed between the main pixel electrode and the sub-pixel electrode. 
     The scan line is disposed between the main pixel electrode and the sub-pixel electrode, and both the main pixel electrode and the sub-pixel electrode are connected to the scan line corresponding to the sub-pixels in the column. 
     The bridge wire  16  runs along the edge of the scan line, thereby reducing signal interference between the signal lines. 
     The pixel electrode  15  may be made of indium tin oxide. 
     The color filter substrate  20  includes a second substrate  21 , a black matrix  22  disposed on a side of the second substrate  21  facing the array substrate  10 , and a common electrode  23  disposed on the black matrix  22 . 
     The array substrate  10  may be a color filter on array (COA), which is a color filter integrated on the array substrate. The array substrate  10  further includes a color filter layer (not shown), and the color filter layer is disposed above the data line  12 . 
     By forming at least one slit-shaped opening  141  on the DBS electrode  14  above the data line  12 , and keeping the black matrix  22  above the data line  12  to shield the slit-shaped opening  141 , thereby solving the problem of data line the pixel structure, such as the parasitic capacitance of the data line is high due to the data line always overlapping the DBS electrode pixel structure of the prior art. In this embodiment, by analog design, the parasitic capacitance of the data line in a single pixel may be reduced by 30% compared with the prior art, which is beneficial to the application of the DBS electrode in high-frequency and large-sized display panels. 
     In the above embodiments, the description of each embodiment has its own emphasis. For a part that is not detailed in an embodiment, please see related descriptions in other embodiments. 
     In the above, a liquid crystal display panel of the present application has been described in the above preferred embodiments, but the preferred embodiments are not intended to limit the scope of the invention, and a person skilled in the art may make various modifications without departing from the spirit and scope of the application. The scope of the present application is determined by claims.