Patent Publication Number: US-2021191188-A1

Title: Liquid crystal display panel

Description:
FIELD OF INVENTION 
     The present invention relates to a field of display technologies, especially relates to a liquid crystal display panel. BACKGROUND OF INVENTION 
     Bezel Less means a liquid crystal display device without a front bezel. Bezel Less products extremely improves beauty of the liquid crystal display devices to provide customers with more friendly experience. At present, a liquid crystal display device usually includes a thin film transistor (TFT) substrate and a color filter (CF) substrate disposed oppositely, a first polarizer disposed on an outside of the CF substrate, and a second polarizer disposed on an outside of the TFT substrate. 
     In a conventional liquid crystal display device, a design of a retracted CF substrate is adopted, in other words, an edge portion of the CF substrate is cut. Indentation of the CF substrate forms a gap between an edge portion of the first polarizer and an edge portion of the TFT substrate. 
     To prevent light leakage on the edge, it is required to coat an adhesive on a side of the liquid crystal display device. However, it is difficult for an adhesive material to be fully filed into the gap between the first polarizer and the TFT substrate during a adhesive coating process, which easily causes serious exterior edge bubbles on the side to affect a quality of the display panel. 
     SUMMARY OF INVENTION 
     Technical issue 
     The present invention provides a liquid crystal display panel to solve the technical issue that it is difficult for an adhesive material to be fully filed into the gap between the first polarizer and the TFT substrate during a adhesive coating process, which easily causes serious exterior edge bubbles on the side to affect a quality of the display panel. 
     Technical solution 
     In a first aspect, the present invention provides a liquid crystal display panel, comprising: 
     a thin film transistor substrate; 
     a color filter substrate; 
     a frame sealant and a liquid crystal layer disposed between the color filter substrate and the thin film transistor substrate; and 
     an upper polarizer disposed on an outside of the color filter substrate; 
     wherein an orthographic projection of the color filter substrate on the upper polarizer encompasses an orthographic projection of the thin film transistor substrate on the upper polarizer; a light shielding adhesive layer is disposed on a side surface of the color filter substrate and is connected securely to the color filter substrate, the thin film transistor substrate, and the upper polarizer, and the light shielding adhesive layer is disposed around a periphery of the color filter substrate. 
     In some embodiments, the orthographic projection of the color filter substrate on the upper polarizer coincides with the orthographic projection of the thin film transistor substrate on the upper polarizer. 
     In some embodiments, the color filter substrate comprises a first main body portion and a first edge portion extending along a direction away from the first main body portion, and an orthographic projection of the first main body portion on the upper polarizer coincides with the orthographic projection of the thin film transistor substrate on the upper polarizer. 
     In some embodiments, the first edge portion is disposed around a periphery of the first main body portion. 
     In some embodiments, a length of an extension of the first edge portion along the direction away from the first main body portion is 30-130 microns. 
     In some embodiments, an orthographic projection of the upper polarizer on the thin film transistor substrate encompasses an orthographic projection of the color filter substrate on the thin film transistor substrate. 
     In some embodiments, the upper polarizer the orthographic projection of the upper polarizer on the thin film transistor substrate coincides with the orthographic projection of the color filter substrate on the thin film transistor substrate, and the light shielding adhesive layer contacts and is connected to a side surface of the upper polarizer. 
     In some embodiments, the upper polarizer comprises a second main body portion and a second edge portion extending along a direction away from the second main body portion, an orthographic projection of the second main body portion on the thin film transistor substrate coincides with the orthographic projection of the color filter substrate on the thin film transistor substrate, and the light shielding adhesive layer contacts and is connected to an inner surface of the second edge portion. 
     In some embodiments, the liquid crystal display panel further comprises a lower polarizer disposed on an outside of the thin film transistor substrate; an orthographic projection of the thin film transistor substrate on the color filter substrate encompasses an orthographic projection of the lower polarizer on the color filter substrate, and an edge of the lower polarizer extends to a position corresponding to the frame sealant. 
     In some embodiments, a portion of the light shielding adhesive layer is located between the color filter substrate and the thin film transistor substrate. 
     In a second aspect, the present invention also provides a liquid crystal display panel, comprising: 
     a thin film transistor substrate; 
     a color filter substrate; 
     a frame sealant and a liquid crystal layer disposed between the color filter substrate and the thin film transistor substrate; and 
     an upper polarizer disposed on an outside of the color filter substrate; 
     wherein an orthographic projection of the color filter substrate on the upper polarizer encompasses an orthographic projection of the thin film transistor substrate on the upper polarizer; a light shielding adhesive layer is disposed on a side surface of the color filter substrate and is connected securely to the color filter substrate, the thin film transistor substrate, and the upper polarizer. 
     In some embodiments, the orthographic projection of the color filter substrate on the upper polarizer coincides with the orthographic projection of the thin film transistor substrate on the upper polarizer. 
     In some embodiments, the color filter substrate comprises a first main body portion and a first edge portion extending along a direction away from the first main body portion, and an orthographic projection of the first main body portion on the upper polarizer coincides with the orthographic projection of the thin film transistor substrate on the upper polarizer. 
     In some embodiments, the first edge portion is disposed around a periphery of the first main body portion. 
     In some embodiments, a length of an extension of the first edge portion along the direction away from the first main body portion is 30-130 microns. 
     In some embodiments, an orthographic projection of the upper polarizer on the thin film transistor substrate encompasses an orthographic projection of the color filter substrate on the thin film transistor substrate. 
     In some embodiments, the orthographic projection of the upper polarizer on the thin film transistor substrate coincides with the orthographic projection of the color filter substrate on the thin film transistor substrate, and the light shielding adhesive layer contacts and is connected to a side surface of the upper polarizer. 
     In some embodiments, the upper polarizer comprises a second main body portion and a second edge portion extending along a direction away from the second main body portion, an orthographic projection of the second main body portion on the thin film transistor substrate coincides with the orthographic projection of the color filter substrate on the thin film transistor substrate, and the light shielding adhesive layer contacts and is connected to an inner surface of the second edge portion. 
     In some embodiments, the liquid crystal display panel further comprises a lower polarizer disposed on an outside of the thin film transistor substrate; an orthographic projection of the thin film transistor substrate on the color filter substrate encompasses an orthographic projection of the lower polarizer on the color filter substrate, and an edge of the lower polarizer extends to a position corresponding to the frame sealant. 
     In some embodiments, a portion of the light shielding adhesive layer is located between the color filter substrate and the thin film transistor substrate. 
     Advantages 
     By optimizing the structure of the edge portion of the color filter substrate, an edge side surface of the color filter substrate is flush with an edge side surface of the thin film transistor substrate, or alternately, a position of the edge portion of the color filter substrate is set to be exposed out of an edge of the thin film transistor substrate. When a light shielding adhesive layer is coated on the side of the color filter substrate after the upper polarizer is attached on the color filter substrate, because no great gap exists between the edge portion of the upper polarizer and the edge portion of the thin film transistor substrate, serious exterior edge bubbles on the light shielding adhesive layer can be effectively prevented to improve the edge quality of the liquid crystal display panel. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic structural view of a liquid crystal display panel in a first embodiment of the present invention; 
         FIG. 2  is a schematic structural view of a liquid crystal display panel in a second embodiment of the present invention; and 
         FIG. 3  is a schematic structural view of a liquid crystal display panel in an embodiment of the present invention. 
     
    
    
     REFERENCE CHARACTERS 
       10 , color filter substrate;  11 , first main body portion;  12 , first edge portion;  20 , thin film transistor substrate;  30 , liquid crystal layer;  40 , frame sealant;  50 , light shielding adhesive layer;  60 , upper polarizer;  61 , second main body portion;  62 , second edge portion;  70 , lower polarizer. 
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     The present invention provides a liquid crystal display panel. To make the objective, the technical solution, and the effect of the present invention clearer and more explicit, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention instead of being used to limit the present invention. 
     The present invention aims at the technical issue that in the conventional liquid crystal display device, it is difficult for an adhesive material to be fully filed into the gap between the first polarizer and the TFT substrate during a adhesive coating process, which easily causes serious exterior edge bubbles on the side to affect a quality of the display panel. The present invention can solve the above issue. 
     A liquid crystal display panel, with reference to  FIG. 1 , comprises a thin film transistor substrate  20 , a color filter substrate  10 , an upper polarizer  60  disposed on an outside of the color filter substrate  10 , a lower polarizer  70  disposed on an outside of the thin film transistor substrate  20 , and a frame sealant  40  and a liquid crystal layer  30  disposed between the color filter substrate  10  and the thin film transistor substrate  20 . 
     An orthographic projection of the color filter substrate  10  on the upper polarizer  60  encompasses an orthographic projection of the thin film transistor substrate  20  on the upper polarizer  60 . A light shielding adhesive layer  50  is disposed on a side surface of the color filter substrate  10  and is connected securely to the color filter substrate  10 , the thin film transistor substrate  20 , and the upper polarizer  60 . The light shielding adhesive layer  50  is disposed around a periphery of the color filter substrate  10 . 
     A design of optimizing an edge portion of the liquid crystal display panel attaches the upper polarizer  60  to color filter substrate  10 , and coats the light shielding adhesive layer  50  on color filter substrate  10 , because no great gap exists between the edge portion of the upper polarizer  60  and the edge portion of the thin film transistor substrate  20 , serious exterior edge bubbles on the light shielding adhesive layer  50  can be effectively prevented to improve the edge quality of the liquid crystal display panel. 
     In a first embodiment, the orthographic projection of the color filter substrate  10  on the upper polarizer  60  coincides with the orthographic projection of the thin film transistor substrate  20  on the upper polarizer  60 . 
     After the color filter substrate  10  is aligned with and bonded to thin film transistor substrate  20 , an edge portion of the color filter substrate  10  is processed by a cutting process such that the side surface of the color filter substrate  10  is flush with a side surface of the thin film transistor substrate  20 . 
     In a second embodiment, with reference to  FIG. 2 , the color filter substrate  10  comprises a first main body portion  11  and a first edge portion  12  extending along a direction away from the first main body portion  11 . An orthographic projection of the first main body portion  11  on the upper polarizer  60  coincides with the orthographic projection of the thin film transistor substrate  20  on the upper polarizer  60 . 
     The first edge portion  12  and the first main body portion  11  are formed integrally to form the color filter substrate  10 , and the first edge portion  12  extends outward to expose an edge of the thin film transistor substrate  20  such that no great gap exists between the edge portion of the upper polarizer  60  and edge portion of the thin film transistor substrate  20 . 
     Furthermore, the first edge portion  12  is disposed around a periphery of the first main body portion  11 . 
     Furthermore, a length of an extension of the first edge portion  12  along the direction away from the first main body portion  11  is 30-130 microns. 
     In an embodiment, the extension of the first edge portion  12  along the direction away from the first main body portion  11  is 50, 80, or 100 microns. 
     Specifically, an orthographic projection of the upper polarizer  60  on the thin film transistor substrate  20  encompasses an orthographic projection of the color filter substrate  10  on the thin film transistor substrate  20  such that an entire surface of the color filter substrate  10  is covered by the upper polarizer  60 , which enhances aesthetic beauty of the edge of the liquid crystal display panel. 
     In an embodiment, the upper polarizer  60  comprises a second main body portion  61  and a second edge portion  62  extending along a direction away from the second main body portion  61 . An orthographic projection of the second main body portion  61  on the thin film transistor substrate  20  coincides with the orthographic projection of the color filter substrate  10  on the thin film transistor substrate  20 . The light shielding adhesive layer  50  contacts and is connected to an inner surface of the second edge portion  62 . 
     The second edge portion  62  and the second main body portion  61  are formed integrally to form the upper polarizer  60 , and the second edge portion  62  extends outward to expose an edge of the color filter substrate  10 . 
     In another embodiment, with reference to  FIG. 3 , the orthographic projection of the upper polarizer  60  on the thin film transistor substrate  20  coincides with the orthographic projection of the color filter substrate  10  on the thin film transistor substrate  20 . The light shielding adhesive layer  50  contacts and is connected to a side surface of the upper polarizer  60 . 
     It should be explained that, with reference to  FIG. 3 , it is only illustrated that an edge side surface of the upper polarizer  60  , an edge side surface of the color filter substrate  10 , and an edge side surface of the thin film transistor substrate  20  n edge side surface are flush with one another. In practical applications, under a circumstance of the edge side surface of the upper polarizer  60  being flush with the edge side surface of the color filter substrate  10 , the edge portion of the color filter substrate  10  can be set to be exposed out of the edge of the thin film transistor substrate  20 . 
     Specifically, an orthographic projection of the thin film transistor substrate  20  on the color filter substrate  10  encompasses an orthographic projection of the lower polarizer  70  on the color filter substrate  10 , and an edge of the lower polarizer  70  extends to a position corresponding to the frame sealant  40 . 
     Specifically, a portion of the light shielding adhesive layer  50  is located between the color filter substrate  10  and the thin film transistor substrate  20  to enhance a connection strength of the light shielding adhesive layer  50  with the color filter substrate  10  and the thin film transistor substrate  20 , and simultaneously performs a better light shielding effect to prevent light leakage on the edge. 
     Advantages of the present invention are as follows: By optimizing the structure of the edge portion of the color filter substrate  10 , an edge side surface of the color filter substrate  10  is flush with an edge side surface of the thin film transistor substrate  20 . Alternately, a position of the edge portion of the color filter substrate  10  is set to be exposed out of an edge of the thin film transistor substrate  20  and the upper polarizer  60  is attached on the color filter substrate  10 , and when a light shielding adhesive layer  50  is coated on the side of the color filter substrate  10 , because no great gap exists between the edge portion of the upper polarizer  60  and the edge portion of the thin film transistor substrate  20 , serious exterior edge bubbles on the light shielding adhesive layer  50  are effectively prevented to improve edge quality of the liquid crystal display panel. 
     It can be understood that for a person of ordinary skill in the art, equivalent replacements or changes can be made according to the technical solution of the present invention and its inventive concept, and all these changes or replacements should belong to the scope of protection of the appended claims of the present invention.