Patent Publication Number: US-2018047678-A1

Title: Tft liquid crystal modules, package structures, and package methods

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present disclosure relates to liquid crystal display (LCD) package structure technology, and more particularly to a TFT liquid crystal module, and the package structure and the package method thereof. 
     2. Discussion of the Related Art 
     Oxide semiconductor, such as Indium gallium zinc oxide (IGZO), includes certain issues regarding TFTs.  FIG. 1  is a schematic view of the conventional TFT package structure. 
     Oxide semiconductor TFT may absorb moisture in the environment, which may change the TFT performance. Usually, a protection layer  3  is adopted to cut off the moisture. The protection layer  3  may be inorganic materials or organic materials. However, the moisture may be kept on the surface of the protection layer  3  or may pass through the protection layer  3  so as to penetrate the TFT unit  2 , which may affect the performance of the TFT, wherein the reference numeral  1  relates to a glass substrate. 
     SUMMARY 
     The present disclosure relates to a TFT liquid crystal module, and the package structure and the package method thereof to prevent the TFT package structure form being immersed by the moisture in the environment so as to enhance the TFT performance. 
     In one aspect, a TFT package structure includes: a first protection layer covering a surface of the TFT, a second protection layer arranged above the first protection layer, and a hydrophobic layer arranged above the second protection layer. 
     Wherein the hydrophobic layer is of one-layer structure or of multiple-layer structure. 
     Wherein the hydrophobic layer is made by organic photoresist material. 
     Wherein the hydrophobic layer is formed by applying a plasma treatment toward the organic photoresist material. 
     Wherein the first protection layer and the second protection layer are made by insulating materials. 
     Wherein the first protection layer and the second protection layer are made by Polyvinyl chloride (PVC). 
     Wherein the first protection layer and the second protection layer are of one-layer structure or of multiple-layer structure. 
     Wherein plasma gas is adopted to process the organic photoresist materials. 
     Wherein the plasma gas is Tetrafluoromethane or SF6. 
     In another aspect, a package method of TFT having a hydrophobic layer includes: forming a first protection layer on a surface of the TFT; forming a second protection layer on an external surface of the first protection layer; and forming the hydrophobic layer on an external surface of the second protection layer. 
     Wherein the hydrophobic layer is of one-layer structure or of multiple-layer structure. 
     Wherein the hydrophobic layer is made by organic photoresist material. 
     Wherein the hydrophobic layer is formed by applying a plasma treatment toward the organic photoresist material. 
     Wherein the first protection layer and the second protection layer are made by insulating materials. 
     Wherein the first protection layer and the second protection layer are made by Polyvinyl chloride (PVC). 
     Wherein the first protection layer d the second protection layer are of one-layer structure or of multiple-layer structure. 
     Wherein plasma gas is adopted to process the organic photoresist materials. 
     Wherein the plasma gas is Tetrafluoromethane or SF6. 
     In another aspect, a TFT liquid crystal module includes a TFT structure unit formed by the above package method. 
     Compared with the conventional technology, the organic photoresist layer is formed on the external surface of the TFT protection layer. The organic photoresist materials are then applied with the plasma gas treatment to obtain the hydrophobic layer. As the hydrophobic layer does not absorb the moisture, that is, the moisture are cut off. Thus, the TFT performance may be kept stable. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view of the conventional TFT package structure. 
         FIG. 2  is a schematic view of the TFT package structure having a hydrophobic layer in accordance with one embodiment. 
         FIG. 3  is a flowchart illustrating the TFT package method in accordance with one embodiment. 
         FIG. 4  is a schematic view of the first protection layer and the second protection layer manufactured by the TFT package method of  FIG. 3 ; and 
         FIG. 5  is a schematic view of the hydrophobic layer formed by the TFT package method of  FIG. 3 . 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Embodiments of the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. 
       FIG. 2  is a schematic view of the TFT package structure having a hydrophobic layer in accordance with one embodiment. The package structure includes, but not limited to: a substrate  100 , a TFT structure unit  200 , a first protection layer  300 , a second protection layer  400 , and a hydrophobic layer  500 . 
     Specifically, the TFT structure unit  200  is arranged on the substrate  100 . The TFT structure unit  200  further includes a gate  210 , a semiconductor layer  220 , a source  230 , a drain  240 , and a metal oxide layer  250 . The detailed structure of the TFT structure unit  200  may be understood by persons skilled in the art, and thus are omitted hereinafter. 
     The first protection layer  300  is configured as a passivation layer covering an external surface of the TFT structure unit  200 , wherein the first protection layer  300  is made by insulating materials. Preferably, the first protection layer  300  may be made by Polyvinyl chloride (PVC). The first protection layer  300  may be of one-layer structure or of multiple-layer structure. 
     The second protection layer  400  is configured as a flat layer covering the external surface of the first protection layer  300 , wherein the second protection layer  400  may be made by insulating materials. Preferably, the second protection layer  400  may be made by Polyvinyl chloride (PVC). The second protection layer  400  may be of one-layer structure or of multiple-layer structure. To enhance the water-proof performance of the TFT, the hydrophobic layer  500  is configured on the external surface of the second protection layer  400 . Similarly, the hydrophobic layer  500  may be of one-layer structure or of multiple-layer structure. Preferably, the hydrophobic layer  500  may be made by organic photoresist materials, and the organic photoresist materials may be formed as the final structure of the hydrophobic layer after the plasma gas treatment, wherein the plasma gas may be Tetrafluoromethane or SF6. 
     Compared with the conventional technology, the organic photoresist layer is formed on the external surface of the TFT protection layer. The organic photoresist materials are then applied with the plasma gas treatment to obtain the hydrophobic layer. As the hydrophobic layer does not absorb the moisture, that is, the moisture are cut off. Thus, the TFT performance may be kept stable. 
       FIG. 3  is a flowchart illustrating the TFT package method in accordance with one embodiment. The method includes, but not limited to, the following steps. 
     In step S 100 , forming a first protection layer on a surface of the TFT. 
       FIG. 4  is a schematic view of the first protection layer and the second protection layer manufactured by the TFT package method of  FIG. 3 . In step S 100 , the TFT structure unit  200  is arranged on the substrate  100 , wherein the TFT structure unit  200  further includes a gate  210 , a semiconductor layer  220 , a source  230 , a drain  240 , and a metal oxide layer  250 . The detailed structure of the TFT structure unit  200  may be understood by persons skilled in the art, and thus are omitted hereinafter. 
     The first protection layer  300  covers the external surface of the TFT structure unit  200 , wherein the first protection layer  300  is made by insulating materials. Preferably, the first protection layer  300  may be made by Polyvinyl chloride (PVC). The first protection layer  300  may be of one-layer structure or of multiple-layer structure. 
     In step S 110 , forming a second protection layer on an external surface of the first protection layer. 
     In step S 110 , the second protection layer  400  covers the external surface of the first protection layer  300 , wherein the second protection layer  400  may be made by insulating materials. Preferably, the second protection layer  400  may be made by Polyvinyl chloride (PVC). The second protection layer  400  may be of one-layer structure or of multiple-layer structure. 
     In step S 120 , forming a hydrophobic layer on the external surface of the second protection layer. 
     To enhance the water-proof performance of the TFT, the hydrophobic layer  500  is configured on the external surface of the second protection layer  400 . Similarly, the hydrophobic layer  500  may be of one-layer structure or of multiple-layer structure. Preferably, the hydrophobic layer  500  may be made by organic photoresist materials, and the organic photoresist materials may be formed as the final structure of the hydrophobic layer after the plasma gas treatment, wherein the plasma gas  999  may be Tetrafluoromethane or SF6.  FIG. 5  is a schematic view of the hydrophobic layer formed by the TFT package method of  FIG. 3 , and the resulting TFT package structure is shown in  FIG. 2 . 
     Compared with the conventional technology, the organic photoresist layer is formed on the external surface of the TFT protection layer. The organic photoresist materials are then applied with the plasma gas treatment to obtain the hydrophobic layer. As the hydrophobic layer does not absorb the moisture, that is, the moisture are cut off. Thus, the TFT performance may be kept stable. 
     In addition, a liquid crystal module includes the TFT structure unit, and the TFT structure unit is packaged by the above package method in the above embodiments. Other structures of the liquid crystal module may be conceived by persons skilled in the art, and thus are omitted hereinafter. 
     It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the invention.