Abstract:
The present disclosure provides a method of manufacturing a liquid crystal display pane. The method includes a first step that provide a TFT substrate and an opposite substrate, a second step that form a first photo alignment layer on the opposite substrate, a third step that expose the first photo alignment layer in a photo alignment exposure process, and a fourth step that bond the TFT substrate and the opposite substrate by a sealant, and injecting liquid crystal between the opposite substrate and the TFT substrate, one end of the sealant is directly adhered to the first photo alignment layer of the opposite substrate. The present disclosure further provides a liquid crystal display panel and a display device.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority to Chinese Patent Application No. 201510134007.7 filed on Mar. 26, 2015, the contents of which are incorporated by reference herein. 
       FIELD 
       [0002]    The subject matter herein generally relates to a method for manufacturing a liquid crystal display panel, and a liquid crystal display panel. 
       BACKGROUND 
       [0003]    Generally, a sealant in a liquid crystal display panel is adhered between an overcoating layer of an opposite substrate and a thin film transistor (TFT) substrate. However, during a photo alignment process of alignment films of the two substrates, the overcoating layers may be damaged, that may cause a low adhesion problem between the damaged overcoating layers and the sealant. Therefore, it is desirable to provide a means which can overcome the above-mentioned problem. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0004]    Implementations of the present technology will now be described, by way of example only, with reference to the attached figures. 
           [0005]      FIG. 1  is an isometric view of an exemplary embodiment of a display device. 
           [0006]      FIG. 2  is a cross-sectional view of the display device taken along line II-II of  FIG. 1 , the display device including a liquid crystal display panel. 
           [0007]      FIG. 3  is a top view of the liquid crystal display panel of  FIG. 2 . 
           [0008]      FIG. 4  is a cross-sectional view of the liquid crystal display panel take along line IV-IV of  FIG. 3 , showing a peripheral portion of the liquid crystal display panel. 
           [0009]      FIG. 5  is a flowchart of an exemplary embodiment of a method of manufacturing the liquid crystal display panel of  FIG. 2 . 
           [0010]      FIG. 6  is a diagrammatic view of an opposite substrate motherboard and a TFT substrate motherboard are provided. 
           [0011]      FIG. 7  is a cross-sectional view of the opposite substrate motherboard and the TFT substrate motherboard, take along line VII-VII and line VIII-VIII of  FIG. 6 . 
           [0012]      FIG. 8  is a top view of a first photo alignment material layer and a second photo alignment material layer. 
           [0013]      FIG. 9  is a top view of a plurality of first photo alignment layers and a plurality of second photo alignment layers. 
           [0014]      FIG. 10  is a cross-sectional view of the opposite substrate motherboard and the TFT substrate motherboard, take along line XI-XI and line XII-XII of  FIG. 9 . 
           [0015]      FIG. 11  is a top view of a plurality of first photo alignment layers and a plurality of second photo alignment layers in another embodiment. 
           [0016]      FIG. 12  is a cross-sectional view of the opposite substrate motherboard and the TFT substrate motherboard, take along line XIII-XIII and line XIV-XIV of  FIG. 11 . 
           [0017]      FIG. 13  is a diagrammatic view that the first photo alignment layers and the second photo alignment layers are exposed. 
           [0018]      FIG. 14  is a diagrammatic view that liquid crystal is dropped on the first photo alignment layer. 
           [0019]      FIG. 15  is a cross-sectional view that a sealant is adhered to the first photo alignment layer and the second photo alignment layer. 
           [0020]      FIG. 16  is a cross-sectional view that a sealant is adhered to the first photo alignment layer and the second photo alignment layer another embodiment. 
           [0021]      FIG. 17  is a diagrammatic view that a plurality of liquid crystal display panels are formed. 
       
    
    
     DETAILED DESCRIPTION 
       [0022]    It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure. 
         [0023]    Referring to  FIG. 1  and  FIG. 2 , a display device  100  includes a liquid crystal display panel  110 , a backlight module  120  and a case  130 . The liquid crystal display panel  110  and the backlight module  120  are accommodated into the case  130 . 
         [0024]    Referring to  FIG. 3  and  FIG. 4 , the liquid crystal display panel  110  includes a TFT substrate  112 , an opposite substrate  111 , a liquid crystal layer  113  and a sealant  114 . The opposite substrate  111  is opposite to the TFT substrate  112 . The liquid crystal layer  113  is located between the TFT substrate  112  and the opposite substrate  111  and is sealed by the sealant  114 . The TFT substrate  112  and the opposite substrate  111  are bonded by the sealant  114 . 
         [0025]    In the embodiment illustrated in  FIG. 3  and  FIG. 4 , the opposite substrate  111  is a color filter substrate. The opposite substrate  111  includes a first substrate  1111 , a color filter layer  1112 , a plurality of black matrixes  1113 , an overcoating layer  1114 , and a first photo alignment layer  1115 . The color filter layer  1112  and the number of black matrixes  1113  are formed on the first substrate  1111 . The overcoating layer  1114  covers the color filter layer  1112  and the black matrixes  1113 . The first photo alignment layer  1115  covers the overcoating layer  1114  and couples with the liquid crystal layer  113 . 
         [0026]    The first substrate  1111  is made of glass, quartz, polymer or other transparent materials. The color filter layer  1112  includes a plurality of red color filter units R, a plurality of green color filter units G, and a plurality of blue color filter units B. Each of the black matrixes  1113  is located between two adjacent units of the number of red color filter units R, the number of green color filter units G, and the number of blue color filter units B. The overcoating layer  1114  covers the color filter layer  1112  and the black matrixes  1113 . The first photo alignment layer  1115  covers the overcoating layer  1114 . In this embodiment, the overcoating layer  1114  is made of inorganic materials or organic materials. The first photo alignment layer  1115  is made of polyimide. 
         [0027]    The TFT substrate  112  includes a second substrate  1121 , a plurality of TFTs  1122  (only shows one here) formed on the second substrate  1121 , a passivation layer  1124  covers the second substrate  1121  and TFTs  1122 , and a second photo alignment layer  1125  covers the passivation layer  1124 . The second photo alignment layer  1125  couples with the liquid crystal layer  113 . The passivation layer  1124  is made of inorganic materials or organic materials. The second photo alignment layer  1115  is made of polyimide. 
         [0028]    One of the two ends of the sealant  114  is directly adhered to and contacts with the first photo alignment layer  1115 , and the other one of the two ends of the sealant  114  is directly adhered to and contacts with the second photo alignment layer  1125 . In the embodiment, outer contours of the first photo alignment layer  1115  and the second photo alignment layer  1125  align with or do not exceed edges of the first substrate  1111  and the second substrates  1121 . 
         [0029]    A whole surface of the overcoating layer  1114  is covered by the first photo alignment layer  1115 , and the sealant  114  is directly adhered to the first photo alignment layer  1115 , and therefore, adhesion strength between the sealant  114  and the first photo alignment layer  1115  is improved. Similarly, the passivation layer  1124  is covered by the second photo alignment layer  1125 , thus the sealant  114  is directly adhered to the second photo alignment layer  1125 , adhesion strength between the sealant  114  and the second photo alignment layer  1125  is improved. 
         [0030]    Referring to  FIG. 5 , a flowchart for manufacturing the liquid crystal display panel  110  is presented in accordance with an example embodiment which is being thus illustrated. The example method is provided by way of example, as there are a variety of ways to carry out the method. The method described below can be carried out using the configurations illustrated in  FIGS. 6 to 17 , for example, and various elements of these figures are referenced in explaining example method. Each block shown in  FIG. 5  represents one or more processes, methods or subroutines, carried out in the exemplary method. Furthermore, the illustrated order of blocks is by example only and the order of the blocks can change according to the present disclosure. Additional blocks may be added or fewer blocks may be utilized, without departing from this disclosure. The exemplary method can begin at block  201 . 
         [0031]    At block  201 , referring to  FIG. 6 , an opposite substrate motherboard  110   a  and a TFT substrate motherboard  110   b  are provided. The TFT substrate motherboard  110   b  includes a plurality of TFT substrates  112  arranged separating from each other. The opposite substrate motherboard  110   a  includes a plurality of opposite substrates  111  corresponding to the number of TFT substrates  112 . 
         [0032]    Referring to  FIG. 7 , each of the opposite substrates  111  includes a first substrate  1111 , a color filter layer  1112  and a plurality of black matrixes  1113  formed on the first substrate  1111 , and an overcoating layer  1114  covering the color filter layer  1112  and the number of black matrixes  1113 . Each of the TFT substrates  112  includes a second substrate  1121 , a plurality of TFTs  1122  (only shows one here) formed on the second substrate  1121 , and a passivation layer  1124  covering the second substrate  1121  and the number of TFTs  1122 . 
         [0033]    At block  202 , referring to  FIG. 8 , a first photo alignment material layer  1115   a  is formed on the overcoating layer  1114  of the opposite substrates  111 , and a second photo alignment material layer  1125   a  is formed on the passivation layer  1124  of the TFT substrates  112 . 
         [0034]    Referring to  FIG. 9 , a plurality of first photo alignment layers  1115  and a plurality of second photo alignment layers  1125  are formed by patterning the first photo alignment material layer  1115   a  and the second photo alignment material layer  1125   a . The first photo alignment layers  1115  are arranged separating from each other. The second photo alignment layers  1125  are arranged such that they are separated from each other by a distance. Each of the first photo alignment layers  1115  corresponds to an opposite substrate  111 . Each of the second photo alignment layers  1125  is corresponding to a TFT substrate  112 . Referring to  FIG. 10 , in this embodiment, outer contours of the first photo alignment layer  1115  and the second photo alignment layer  1125  align with or do not exceed edges of the first substrate  1111  and the second substrates  1121 . Referring to  FIG. 11  and  FIG. 12 , in another embodiment, outer contours of the first photo alignment layer  1115  and the second photo alignment layer  1125  exceed edges of the first substrate  1111  and the second substrates  1121 . 
         [0035]    At block  203 , referring to  FIG. 13 , the first photo alignment layers  1115  and the second photo alignment layers  1125  are exposed via a photo alignment exposure process. In this embodiment, the first photo alignment layers  1115  and the second photo alignment layers  1125  are exposed by ultraviolet light in a range of 20-400 nm wave length and 100-5000 mega joule light energy. 
         [0036]    At block  204 , the opposite substrates  111  and the TFT substrates  112  are bonded by the sealants, and the liquid crystal layer  113  is injected between the opposite substrates  111  and the TFT substrates  112 . Referring to  FIG. 14 , liquid crystal is dropped on the first photo alignment layer  1115  to form a liquid crystal layer  113  on the first photo alignment layer  1115 . It is understood that, in other embodiments, the liquid crystal may be dropped on the second photo alignment layer  1125  instead of dropped on the first photo alignment layer  1115  to form a liquid crystal layer  113  on the second photo alignment layer  1125 . 
         [0037]    Referring to  FIG. 15  and  FIG. 16 , after the liquid crystal layer  113  is formed, one of the two ends of the sealant  114  is directly adhered to and contacts with the first photo alignment layer  1115 , and the other one of the two ends of the sealant  114  is directly adhered to and contacts with the second photo alignment layer  1125 . After the sealant  114  is adhered to the first photo alignment layer  1115  and the second photo alignment layer  1125 , the sealant  114  is solidified. 
         [0038]    At block  205 , referring to  FIG. 17 , a plurality of liquid crystal display panels  110  are formed by cutting the assembly of the opposite substrate motherboard  110   a  and the TFT substrate motherboard  110   b  along a cutting line between two adjacent TFT substrates  112 . The present liquid crystal display panel  110  is thus obtained. Accordingly, in the illustrated embodiment, portions of the outer contours of the first photo alignment layer  1115  exceed the first substrate  1111  and the second photo alignment layer  1125  exceed the second substrate  1121  are cut during cutting the assembly of an opposite substrate motherboard  110   a  and the TFT substrate motherboard  110   b , so that the outer contours of the first photo alignment layer  1115  and the second photo alignment layer  1125  both align with edges of the first substrate  1111  and the second substrates  1121 . 
         [0039]    The embodiments shown and described above are only examples. Many details are often found in the art such as the other features of a TFT array substrate, a display panel using the TFT array substrate, and a method for manufacturing the TFT array substrate. Therefore, many such details are neither shown nor described. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the detail, especially in matters of shape, size and arrangement of the parts within the principles of the present disclosure up to, and including the full extent established by the broad general meaning of the terms used in the claims. It will therefore be appreciated that the embodiments described above may be modified within the scope of the claims.