Abstract:
A method for manufacturing an array substrate is provided. The array substrate, by providing a black matrix and a color resist layer on the array substrate and providing the color resist layer on the TFT layer, prevents bad influences on the color resist layer caused by a high temperature TFT process so as to provide a liquid crystal panel with improved displaying quality. The method includes, firstly, forming a black matrix on a substrate, and secondly, implementing a TFT manufacture process on the black matrix, and then forming a color resist layer after the TFT manufacture process. Accordingly, forming both the black matrix and the color resist layer on the array substrate can be achieved, where the color resist layer is formed after the TFT manufacture process to prevent bad phenomenon caused by the high temperature of the TFT process.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This is a divisional application of co-pending patent application Ser. No. 14/424,007, filed on Feb. 25, 2015, which is a national stage of PCT Application Number PCT/CN2015/072469, filed on Feb. 8, 2015, claiming foreign priority of Chinese Patent Application Number 201410717233.3, filed on Dec. 1, 2014. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention relates to a display technology field, and more particularly to an array substrate and a manufacture method thereof. 
       BACKGROUND OF THE INVENTION 
       [0003]    The LCD (Liquid Crystal Display) possesses many advantages of being ultra thin, power saved and radiation free. It has been widely utilized in, such as LCD TVs, mobile phones, PDAs, digital cameras, laptop screens or notebook screens. Most of LCDs on the market are backlight type LCDs, comprising a Backlight module and a liquid crystal panel combined with the Backlight module. 
         [0004]    In the TFT-LCD (Thin Film Transistor Liquid Crystal Display), a BM (Black Matrix) is manufactured on the substrate in general, which is employed for diving the adjacent color resists for shielding the gaps among the color resists to prevent the light leakage or color mixture, and the technology of manufacturing the black matrix on the TFT array substrate is named BOA (BM On Array, the black matrix is attached on the array substrate), and BOA can solve the issue that the light resist areas are mismatched due to the mis-alignment of the upper, lower substrates. 
         [0005]    Meanwhile, COA (Color Filter On Array, the color resist layer is attached on the array substrate) is proposed for promoting the display quality of the TFT-LCD (Thin Film Transistor Liquid Crystal Display). 
         [0006]    As shown in  FIG. 1 , as the BOA and COA technologies are applied to the array substrate  100 , the black matrix  200  and the color resist layer  300  are formed at the same layer for utilizing the spray coating technology. The color resist layer  300  will suffer the high temperature PVD (Physical vapor deposition) and CVD (Chemical vapor deposition) processes in the TFT manufacture process, which can seriously influence the performance of the color resist layer  300 , and besides, the high temperature process will make the volatilization of the color resist layer  300  to generate gas and the gas becomes the source of the bubbles. The production yield is descended. 
       SUMMARY OF THE INVENTION 
       [0007]    An objective of the present invention is to provide an array substrate, by locating both a black matrix and a color resist layer on the array substrate, and locating the color resist layer on the TFT layer to prevent the bad influence to the color resist layer from the high temperature TFT process, and accordingly to make the liquid crystal panel with higher display quality. 
         [0008]    Another objective of the present invention is to provide a manufacture method of an array substrate, first to form a black matrix on the substrate, and second to implement TFT manufacture process on the black matrix, and then to form a color resist layer after the TFT manufacture. Accordingly, both the black matrix and the color resist layer manufactured on the array substrate can be achieved, and with forming the color resist layer after the TFT manufacture to prevent the bad phenomenon due to bubbles generated by the color resist volatilization from the high temperature TFT process, and accordingly to effectively make the liquid crystal panel with higher display quality and raise production yield. 
         [0009]    For realizing the aforesaid objective, the present invention provides an array substrate, comprising a substrate, a black matrix located on the substrate, a TFT layer located on the black matrix, a color resist layer located on the TFT layer, a second passivation layer and a pixel electrode layer. 
         [0010]    The TFT layer comprises a source/a drain located on the black matrix, a semiconductor layer located on the source/the drain, a gate isolation layer located on the semiconductor layer, a gate located on the gate isolation layer and a first passivation layer located on the gate. 
         [0011]    The color resist layer is located on the first passivation layer, the second passivation layer is located on the color resist layer, and the pixel electrode layer is located on the second passivation layer, and the array substrate further comprises a via hole penetrating the second passivation layer, the color resist layer, the first passivation layer, the gate isolation layer and the semiconductor layer, and the pixel electrode layer is electrically connected with the source/the drain by the via hole. 
         [0012]    The pixel electrode layer comprises a first ITO electrode layer and a second ITO electrode layer, and the first ITO electrode layer is located on the first passivation layer, and the array substrate further comprises a via hole penetrating the first passivation layer, the gate isolation layer and the semiconductor layer, and the first ITO electrode layer is electrically connected with the source/the drain by the via hole, and the color resist layer is located on the first ITO electrode layer, and the second passivation layer is located on the color resist layer, and the second ITO electrode layer is located on the second passivation layer, and the first ITO electrode layer and the second ITO electrode layer are connected to together form the pixel electrode layer. 
         [0013]    A material of the source/the drain and the gate is copper or aluminum. 
         [0014]    The semiconductor layer is a double layer structure comprising an amorphous silicon layer and a heavy doped N type silicon layer, or a single layer structure, comprising an indium gallium zinc oxide layer. 
         [0015]    The present invention further provides a manufacture method of an array substrate, comprising steps of: 
         [0016]    Step  1 , providing a substrate and forming a black matrix on the substrate; 
         [0017]    Step  2 , forming a TFT layer on the black matrix; and 
         [0018]    Step  3 , forming a color resist layer, a second passivation layer, and a pixel electrode layer on the TFT layer and the substrate; 
         [0019]    wherein Step  2  comprises: 
         [0020]    Step  21 , depositing and patterning a first metal layer on the black matrix to form a source/a drain; 
         [0021]    Step  22 , forming a semiconductor layer on the source/the drain, and forming a gate isolation layer on the semiconductor layer; 
         [0022]    Step  23 , depositing and patterning a second metal layer on the gate isolation layer to form a gate; and 
         [0023]    Step  24 , forming a first passivation layer on the gate. 
         [0024]    Step  3  may comprise: 
         [0025]    Step  31 , forming a color resist layer on the first passivation layer, and forming a second passivation layer on the color resist layer; 
         [0026]    Step  32 , forming a via hole in the second passivation layer, the color resist layer, the first passivation layer, the gate isolation layer and the semiconductor layer; and 
         [0027]    Step  33 , forming a pixel electrode layer on the second passivation layer, wherein the pixel electrode layer is electrically connected with the source/the drain by the via hole. 
         [0028]    Step  3  may comprise: 
         [0029]    Step  31 , forming a via hole in the first passivation layer, the gate isolation layer and the semiconductor layer; 
         [0030]    Step  32 , forming a first ITO electrode layer, wherein the first ITO electrode layer is electrically connected with the source/the drain by the via hole; 
         [0031]    Step  33 , forming a color resist layer on the first ITO electrode layer, and forming a second passivation layer on the color resist layer; and 
         [0032]    Step  34 , forming a second ITO electrode layer on the second passivation layer, wherein the first ITO electrode layer and the second ITO electrode layer are connected to together form the pixel electrode layer. 
         [0033]    A material of the source/the drain and the gate is copper or aluminum. 
         [0034]    The semiconductor layer is a double layer structure comprising an amorphous silicon layer and a heavy doped N type silicon layer, or a single layer structure, comprising an indium gallium zinc oxide layer. 
         [0035]    The present invention further provides an array substrate, comprising a substrate, a black matrix located on the substrate, a TFT layer located on the black matrix, a color resist layer located on the TFT layer, a second passivation layer and a pixel electrode layer; 
         [0036]    wherein TFT layer comprises a source/a drain located on the black matrix, a semiconductor layer located on the source/the drain, a gate isolation layer located on the semiconductor layer, a gate located on the gate isolation layer and a first passivation layer located on the gate; 
         [0037]    wherein the color resist layer is located on the first passivation layer, the second passivation layer is located on the color resist layer, and the pixel electrode layer is located on the second passivation layer, and the array substrate further comprises a via hole penetrating the second passivation layer, the color resist layer, the first passivation layer, the gate isolation layer and the semiconductor layer, and the pixel electrode layer is electrically connected with the source/the drain by the via hole; 
         [0038]    wherein a material of the source/the drain and the gate is copper or aluminum. 
         [0039]    The benefits of the present invention are: the present invention provides an array substrate, and applies BOA and COA technology on the array substrate at the same time, i.e. locating both the black matrix and the color resist layer on the array substrate. The color resist layer is located on the TFT layer and the black matrix to prevent the color resist from the high temperature TFT process and eliminate the source of the bubble source in the liquid crystal display panel. Meanwhile, the TFT layer utilizes the top gate TFT structure to prevent the leakage of the BOA structure array substrate, and accordingly, the display quality of the liquid crystal panel is effectively promoted. The present invention provides a manufacture method of an array substrate, and applies BOA and COA technology on the array substrate at the same time. First forms a black matrix on the substrate, and second implements TFT manufacture process on the black matrix, and then forms a color resist layer after the TFT manufacture. Accordingly, both the black matrix and the color resist layer manufactured on the array substrate can be achieved, and with forming the color resist layer after the TFT manufacture to prevent the bad phenomenon due to bubbles generated by the color resist volatilization from the high temperature TFT process, and meanwhile, the TFT layer utilizes the top gate TFT structure to prevent the leakage of the BOA structure array substrate, and accordingly, the display quality of the liquid crystal panel is effectively promoted and production yield is raised. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0040]    The technical solution and the beneficial effects of the present invention are best understood from the following detailed description with reference to the accompanying figures and embodiments. 
           [0041]    In drawings, 
           [0042]      FIG. 1  is a sectional diagram of a TFT substrate structure according to prior art; 
           [0043]      FIG. 2  is a sectional diagram of a TFT substrate structure according to the first embodiment of the present invention; 
           [0044]      FIG. 3  is a sectional diagram of a TFT substrate structure according to the second embodiment of the present invention; and 
           [0045]      FIG. 4  is a flowchart of a manufacture method of a TFT substrate according to the present invention. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0046]    For better explaining the technical solution and the effect of the present invention, the present invention will be further described in detail with the accompanying drawings and the specific embodiments. 
         [0047]    The present invention provides an array substrate, and applies BOA and COA technology on the array substrate at the same time, i.e. locating both the black matrix and the color resist layer on the array substrate. The color resist layer is located on the TFT layer and the black matrix to prevent the color resist from the high temperature TFT process and eliminate the source of the bubble source in the liquid crystal display panel. Referring to  FIG. 2 , a sectional diagram of a TFT substrate structure according to a first embodiment of the present invention is provided. In the first embodiment, the array substrate comprises a substrate  1 , a black matrix  2  located on the substrate  1 , a TFT layer  21  located on the black matrix  2 , a color resist layer  8  located on the TFT layer  21 , a second passivation layer  9  and a pixel electrode layer  11 . 
         [0048]    Preferably, the substrate  1  is a glass substrate. 
         [0049]    Preferably, for preventing the leakage of the BOA type array substrate, the TFT layer  21  is selected to be a top gate type TFT structure, and the TFT layer  21  comprises a source/a drain  3  located on the black matrix  2 , a semiconductor layer  4  located on the source/the drain  3 , a gate isolation layer  5  located on the semiconductor layer  4 , a gate  6  located on the gate isolation layer  5  and a first passivation layer  7  located on the gate  6 . 
         [0050]    The semiconductor layer  4  can be a double layer structure comprising an a-Si (amorphous silicon) layer and an n+ Si (heavy doped N type silicon) layer, or a single layer structure, comprising an IGZO (Indium Gallium Zinc Oxide) layer. 
         [0051]    Preferably, a material of the source/the drain  3  and the gate  6  is copper or aluminum. 
         [0052]    Preferably, a material of the gate isolation layer  5  is silicon nitride. 
         [0053]    The color resist layer  8  is located on the first passivation layer  7 ; the second passivation layer  9  is located on the color resist layer  8 ; and the pixel electrode layer  11  is located on the second passivation layer  9 ; and the array substrate further comprises a via hole  10  penetrating the second passivation layer  9 , the color resist layer  8 , the first passivation layer  7 , the gate isolation layer  5  and the semiconductor layer  4 ; and the pixel electrode layer  11  is electrically connected with the source/the drain  3  by the via hole  10 . 
         [0054]    Preferably, a material of the first passivation layer  7  and a material of the second passivation layer  9  are silicon nitride. 
         [0055]    Preferably, a material of the pixel electrode layer  11  is indium tin oxide. 
         [0056]    Referring to  FIG. 4 , a flowchart of a manufacture method of a TFT substrate according to the present invention is provided, and for obtaining the array substrate according to the first embodiment of the present invention, the present invention further provides a manufacture method of the array substrate, comprising the following steps: 
         [0057]    Step  1 , providing a substrate  1  and forming a black matrix  2  on the substrate. 
         [0058]    Specifically, the substrate  1  in Step  1  is a glass substrate, and the black matrix  2  is formed on the substrate  1  through a coating process. 
         [0059]    Step  2 , forming a TFT layer  21  on the black matrix  2 . 
         [0060]    Preferably, for preventing the leakage of the BOA type array substrate, the TFT layer  21  is selected to be a top gate type TFT structure. 
         [0061]    Specifically, Step  2  comprises the following steps: 
         [0062]    Step  21 , depositing and patterning a first metal layer on the black matrix  2  to form a source/a drain  3 . 
         [0063]    Preferably, a material of the source/the drain  3  is copper or aluminum. 
         [0064]    Step  22 , forming a semiconductor layer  4  on the source/the drain  3 , and forming a gate isolation layer  5  on the semiconductor layer  4 . 
         [0065]    The semiconductor layer  4  can be a double layer structure comprising an a-Si (amorphous silicon) layer and an n+ Si (heavy doped N type silicon) layer, or a single layer structure, comprising an IGZO (Indium Gallium Zinc Oxide) layer. 
         [0066]    Preferably, a material of the gate isolation layer  5  is silicon nitride. 
         [0067]    Step  23 , depositing and patterning a second metal layer on the gate isolation layer  5  to form a gate  6 . 
         [0068]    Preferably, a material of the gate  6  is copper or aluminum. 
         [0069]    Step  24 , forming a first passivation layer  7  on the gate  6 . 
         [0070]    Preferably, a material of the first passivation layer  7  is silicon nitride. 
         [0071]    Step  3 , forming a color resist layer  8 , a second passivation layer  9  and a pixel electrode layer  11  on the TFT layer  21  and the substrate  1 . 
         [0072]    Specifically, Step  3  comprises the following steps: 
         [0073]    Step  31 , forming a color resist layer  8  on the first passivation layer  7 , and forming a second passivation layer  9  on the color resist layer  8 . 
         [0074]    Specifically, the color resist layer  8  is formed through a coating process. 
         [0075]    Preferably, a material of the first passivation layer  7  and a material of the second passivation layer  9  are silicon nitride. 
         [0076]    Step  32 , forming a via hole  10  in the second passivation layer  9 , the color resist layer  8 , the first passivation layer  7 , the gate isolation layer  5  and the semiconductor layer  4 . 
         [0077]    Specifically, the via hole  10  is formed through a dry etching process. 
         [0078]    Step  33 , forming a pixel electrode layer  11  on the second passivation layer  9 , wherein the pixel electrode layer  11  is electrically connected with the source/the drain  3  by the via hole  10 . 
         [0079]    Specifically, the pixel electrode layer  11  is formed through a vacuum coating process and a wet etching process. 
         [0080]    Preferably, a material of the pixel electrode layer  11  is indium tin oxide. 
         [0081]    Referring to  FIG. 3 , a sectional diagram of a TFT substrate structure according to a second embodiment of the present invention is provided. In the second embodiment, the array substrate comprises a substrate  1 , a black matrix  2  located on the substrate  1 , a TFT layer  21  located on the black matrix  2 , a color resist layer  8  located on the TFT layer  21 , a second passivation layer  9  and a pixel electrode layer  11 . 
         [0082]    Preferably, the substrate  1  is a glass substrate. 
         [0083]    The TFT layer  21  is a top gate type TFT, and the TFT layer  21  comprises a source/a drain  3  located on the black matrix  2 , a semiconductor layer  4  located on the source/the drain  3 , a gate isolation layer  5  located on the semiconductor layer  4 , a gate  6  located on the gate isolation layer  5  and a first passivation layer  7  located on the gate  6 . 
         [0084]    The semiconductor layer  4  can be a double layer structure comprising an a-Si (amorphous silicon) layer and an n+ Si (heavy doped N type silicon) layer, or a single layer structure, comprising an IGZO (Indium Gallium Zinc Oxide) layer. 
         [0085]    Preferably, a material of the source/the drain  3  and the gate  6  is copper or aluminum. 
         [0086]    Preferably, a material of the gate isolation layer  5  is silicon nitride. 
         [0087]    The pixel electrode layer  11  comprises a first ITO electrode layer  112  and a second ITO electrode layer  114 , and the first ITO electrode layer  112  is located on the first passivation layer  7 , and the array substrate further comprises a via hole  10 ′ penetrating the first passivation layer  7 , the gate isolation layer  5  and the semiconductor layer  4 , and the first ITO electrode layer  112  is electrically connected with the source/the drain  3  by the via hole  10 ′, and the color resist layer  8  is located on the first ITO electrode layer  112 , and the second passivation layer  9  is located on the color resist layer  8 , and the second ITO electrode layer  114  is located on the second passivation layer  9 , and the first ITO electrode layer  112  and the second ITO electrode layer  114  are connected to together form the pixel electrode layer  11 . 
         [0088]    Preferably, a material of the first passivation layer  7  and a material of the second passivation layer  9  are silicon nitride. 
         [0089]    Preferably, a material of the first ITO electrode layer  112  and a material of the second ITO electrode layer  114  are indium tin oxide. 
         [0090]    Compared with the array substrate according to the first embodiment of the present invention, the merit of the array substrate according to the second embodiment of the present invention is that the via hole is not formed in the color resist layer, and therefore, the flatness of the TFT substrate can be reserved better. 
         [0091]    Referring to  FIG. 4 , a flowchart of a manufacture method of a TFT substrate according to the present invention is provided, and for obtaining the array substrate according to the second embodiment of the present invention, the present invention further provides a manufacture method of the array substrate, comprising the following steps: 
         [0092]    Step  1 , providing a substrate  1  and forming a black matrix  2  on the substrate  1 . 
         [0093]    Specifically, the substrate  1  in Step  1  is a glass substrate, and the black matrix  2  is formed on the substrate  1  through a coating process. 
         [0094]    Step  2 , forming a TFT layer  21  on the black matrix  2 . 
         [0095]    Specifically, Step  2  comprises the following steps: 
         [0096]    Step  21 , depositing and patterning a first metal layer on the black matrix  2  to form a source/a drain  3 . 
         [0097]    Preferably, a material of the source/the drain  3  is copper or aluminum 
         [0098]    Step  22 , forming a semiconductor layer  4  on the source/the drain  3 , and forming a gate isolation layer  5  on the semiconductor layer  4 . 
         [0099]    The semiconductor layer  4  can be a double layer structure comprising an a-Si (amorphous silicon) layer and an n+ Si (heavy doped N type silicon) layer, or a single layer structure, comprising an IGZO (Indium Gallium Zinc Oxide) layer. 
         [0100]    Preferably, a material of the gate isolation layer  5  is silicon nitride. 
         [0101]    Step  23 , depositing and patterning a second metal layer on the gate isolation layer  5  to form a gate  6 . 
         [0102]    Preferably, a material of the gate  6  is copper or aluminum. 
         [0103]    Step  24 , forming a first passivation layer  7  on the gate  6 . 
         [0104]    Preferably, a material of the first passivation layer  7  is silicon nitride. 
         [0105]    Step  3 , forming a color resist layer  8 , a second passivation layer  9  and a pixel electrode layer  11  on the TFT layer  21  and the substrate  1 . 
         [0106]    Specifically, Step  3  comprises the following steps: 
         [0107]    Step  31 , forming a via hole  10  in the first passivation layer  7 , the gate isolation layer  5  and the semiconductor layer  4 . 
         [0108]    Specifically, the via hole  10 ′ is formed through a dry etching process. 
         [0109]    Step  32 , forming a first ITO electrode layer  112  on the first passivation layer  7 , wherein the first ITO electrode layer  112  is electrically connected with the source/the drain  3  by the via hole  10 ′. 
         [0110]    Specifically, the first ITO electrode layer  112  is formed through a vacuum coating process and a wet etching process. 
         [0111]    Step  33 , forming a color resist layer  8  on the first ITO electrode layer  112 , and forming a second passivation layer  9  on the color resist layer  8 . 
         [0112]    Specifically, the color resist layer  8  is formed through a coating process. 
         [0113]    Preferably, a material of the second passivation layer  9  is silicon nitride. 
         [0114]    Step  34 , forming a second ITO electrode layer  114  on the second passivation layer  9 , wherein the first ITO electrode layer  112  and the second ITO electrode layer  114  are connected to together form the pixel electrode layer  11 . 
         [0115]    Specifically, the second ITO electrode layer  114  is formed through a vacuum coating process and a wet etching process. 
         [0116]    Preferably, a material of the first ITO electrode layer  112  and a material of the second ITO electrode layer  114  are indium tin oxide. 
         [0117]    Compared with the manufacture method of the array substrate according to the first embodiment of the present invention, the merit of the manufacture method of the array substrate according to the second embodiment of the present invention is that the via hole is not formed in the color resist layer, and therefore, the flatness of the TFT substrate can be reserved better. 
         [0118]    In conclusion, the present invention provides an array substrate, and applies BOA and COA technology on the array substrate at the same time, i.e. locating both the black matrix and the color resist layer on the array substrate. The color resist layer is located on the TFT layer and the black matrix to prevent the color resist from the high temperature TFT process and eliminate the source of the bubble source in the liquid crystal display panel. Meanwhile, the TFT layer utilizes the top gate TFT structure to prevent the leakage of the BOA structure array substrate, and accordingly, the display quality of the liquid crystal panel is effectively promoted. The present invention provides a manufacture method of an array substrate, and applies BOA and COA technology on the array substrate at the same time. First forms a black matrix on the substrate, and second implements TFT manufacture process on the black matrix, and then forms a color resist layer after the TFT manufacture. Accordingly, both the black matrix and the color resist layer manufactured on the array substrate can be achieved, and with forming the color resist layer after the TFT manufacture to prevent the bad phenomenon due to bubbles generated by the color resist volatilization from the high temperature TFT process, and meanwhile, the TFT layer utilizes the top gate TFT structure to prevent the leakage of the BOA structure array substrate, and accordingly, the display quality of the liquid crystal panel is effectively promoted and production yield is raised. 
         [0119]    Above are only specific embodiments of the present invention, the scope of the present invention is not limited to this, and to any persons who are skilled in the art, change or replacement which is easily derived should be covered by the protected scope of the invention. Thus, the protected scope of the invention should go by the subject claims.