Patent Document

BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present disclosure relates to liquid crystal display technology, and more particularly to a thin film transistor (TFT) substrate and the manufacturing method thereof. 
     2. Discussion of the Related Art 
     Curved TVs typically are characterized by attributes including better contrastness, a wider viewing angle, and better user experience, and thus are very popular to customers. 
     As the panel is curved to some degree, displacement may occur between the TFT substrate and the color filter (CF) substrate, which affects masking effects of the black matrix (BM) arranged on the CF substrate.  FIG. 1  shows the masking effect of the BM  101  when the panel  100  has not been curved.  FIG. 2  shows the masking effect of the BM  101  when the panel  100  has been curved. It can be seen from  FIGS. 1 and 2  that a portion of light beams may emit out from a lateral side of the BM  101  after the panel  100  is curved. The light leakage effect affects the masking effect of the BM  101  such that the contrastness of the panel  100  is lowered down. 
     SUMMARY 
     A TFT substrate and the manufacturing method thereof can ensure the masking effect and can reduce the coupling capacitance between the data line and the scanning line may be reduced. 
     In one aspect, a manufacturing method of a TFT substrate includes: providing a substrate; forming a gate electrode on the substrate; forming a first insulation layer and an active layer on the gate electrode in turn; forming a first black matrix on the active layer; forming a source electrode and a drain electrode on the first black matrix; 
     forming a second insulation layer on the source electrode and the drain electrode; forming a pixel electrode on the second insulation layer, the pixel electrode being electrically connected to the source electrode or the drain electrode via the second insulation layer; wherein the step of forming the gate electrode further comprises forming at least one scanning line on the substrate, the scanning line being arranged on the same layer with the gate electrode, and wherein the first insulation layer further covers the scanning line, and the active layer has not covered the scanning line; wherein the step of forming the first black matrix further comprises forming a second black matrix on the scanning line, and the second black matrix being arranged on the same layer with the first black matrix; wherein the step of forming the source electrode and the drain electrode on the first black matrix further comprises forming a capacitance electrode on the second black matrix, the capacitance electrode being arranged on the same layer with the source electrode and the drain electrode, wherein the second insulation layer further covers the capacitance electrode, and the pixel electrode being electrically connected to the capacitance electrode via the second insulation layer; and wherein the first black matrix and the second matrix are made by black resin material. 
     Wherein the step of forming the first black matrix on the active layer further comprises: forming contacting holes respectively on the first black matrix and the second black matrix such that the source electrode and the drain electrode being contacted with the active layer via the contacting hole on the first black matrix, and the capacitance electrode being contacted with the first insulation layer via the contacting hole on the second black matrix. 
     Wherein the method further comprises: forming a photoresist layer between the pixel electrode and the second insulation layer; and forming an insulation protection layer between the photoresist layer and the pixel electrode. 
     Wherein the step of forming the photoresist layer between the pixel electrode and the second insulation layer further comprises forming a first contacting hold and a second contacting hole respectively in locations on the photoresist layer corresponding to the source or drain electrode and the capacitance electrode, wherein the second insulation layer being exposed by the first contacting hole, and the second contacting hole being passed through the second insulation layer such that the capacitance electrode being exposed; wherein the step of forming the insulation protection layer between the photoresist layer and the pixel electrode further comprises: forming the insulation protection layer within the first contacting hole and the second contacting hole; 
     forming a third contacting hole within the insulation protection layer of the first contacting hole and the second contacting hole, the insulation protection layer within the second contacting hole being arranged on the second insulation layer, wherein the pixel electrode being electrically connected to the drain electrode or the source electrode via the third contacting hole, and the pixel electrode being electrically connected to the capacitance electrode via the second contacting hole. 
     In another aspect, a manufacturing method of a TFT substrate includes: providing a substrate; forming a gate electrode on the substrate; forming a first insulation layer and an active layer on the gate electrode in turn; forming a first black matrix on the active layer; forming a source electrode and a drain electrode on the first black matrix; forming a second insulation layer on the source electrode and the drain electrode; and 
     forming a pixel electrode on the second insulation layer, the pixel electrode being electrically connected to the source electrode or the drain electrode via the second insulation layer. 
     Wherein the step of forming the gate electrode further comprises forming at least one scanning line on the substrate, the scanning line being arranged on the same layer with the gate electrode, and wherein the first insulation layer further covers the scanning line, and the active layer has not covered the scanning line; wherein the step of forming the first black matrix further comprises forming a second black matrix on the scanning line, and the second black matrix being arranged on the same layer with the first black matrix; and wherein the step of forming the source electrode and the drain electrode on the first black matrix further comprises forming a capacitance electrode on the second black matrix, the capacitance electrode being arranged on the same layer with the source electrode and the drain electrode, wherein the second insulation layer further covers the capacitance electrode, and the pixel electrode being electrically connected to the capacitance electrode via the second insulation layer. 
     Wherein the step of forming the first black matrix on the active layer further comprises: forming contacting holes respectively on the first black matrix and the second black matrix such that the source electrode and the drain electrode being contacted with the active layer via the contacting hole on the first black matrix, and the capacitance electrode being contacted with the first insulation layer via the contacting hole on the second black matrix. 
     Wherein forming a photoresist layer between the pixel electrode and the second insulation layer; and forming an insulation protection layer between the photoresist layer and the pixel electrode. 
     Wherein the step of forming the photoresist layer between the pixel electrode and the second insulation layer further comprises forming a first contacting hold and a second contacting hole respectively in locations on the photoresist layer corresponding to the source or drain electrode and the capacitance electrode, wherein the second insulation layer being exposed by the first contacting hole, and the second contacting hole being passed through the second insulation layer such that the capacitance electrode being exposed; wherein the step of forming the insulation protection layer between the photoresist layer and the pixel electrode further comprises: forming the insulation protection layer within the first contacting hole and the second contacting hole; forming a third contacting hole within the insulation protection layer of the first contacting hole and the third contacting hole, the insulation protection layer within the second contacting hole being arranged on the second insulation layer, wherein the pixel electrode being electrically connected to the drain electrode or the source electrode via the third contacting hole, and the pixel electrode being electrically connected to the capacitance electrode via the second contacting hole. 
     In another aspect, a TFT substrate includes: a substrate; a gate electrode being arranged on the substrate; a first insulation layer and an active layer being arranged on the gate electrode in turn; a first black matrix being arranged on the active layer; a source electrode and a drain electrode being arranged on the first black matrix; a second insulation layer being arranged on the source electrode and the drain electrode; and a pixel electrode being arranged on the second insulation layer, and he pixel electrode being electrically connected to the source electrode or the drain electrode via the second insulation layer. 
     Wherein the TFT substrate further comprises: a scanning line being arranged on the same layer with the gate electrode on the substrate, the first insulation layer further covers the scanning line, and the active layer has not covered the scanning line; a second black matrix being arranged on the scanning line, and the second black matrix being arranged on the same layer with the first black matrix; and an capacitance electrode being arranged on the second black matrix, the capacitance electrode being arranged on the same layer with the source electrode and the drain electrode, and the pixel electrode being electrically connected to the capacitance electrode via the second insulation layer. 
     Wherein the first black matrix and the second black matrix respectively comprises contacting holes such that the source electrode and the drain electrode being contacted with the active layer via the contacting hole on the first black matrix, and the capacitance electrode being contacted with the first insulation layer via the contacting hole on the second black matrix. 
     Wherein the TFT substrate further comprises: a photoresist layer being arranged between the pixel electrode and the second insulation layer; and an insulation protection layer being arranged between the photoresist layer and the pixel electrode. 
     Wherein a first contacting hold and a second contacting hole are respectively formed in locations on the photoresist layer corresponding to the source or drain electrode and the capacitance electrode, wherein the second insulation layer being exposed by the first contacting hole, and the second contacting hole being passed through the second insulation layer such that the capacitance electrode being exposed; the insulation protection layer is formed within the first contacting hole and the second contacting hole; a third contacting hole is formed within the insulation protection layer of the first contacting hole and the second contacting hole, the insulation protection layer within the second contacting hole being arranged on the second insulation layer, wherein the pixel electrode being electrically connected to the drain electrode or the source electrode via the third contacting hole, and the pixel electrode being electrically connected to the capacitance electrode via the second contacting hole. 
     In view of the above, by arranging the black matrix on the active layer and by forming the source electrode and drain electrode on the black matrix, the black matrix is capable of masking the corresponding lights even the panel has been curved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows the masking effect of the BM when the panel has not been curved. 
         FIG. 2  shows the masking effect of the BM when the panel has been curved. 
         FIG. 3  is a schematic view of the TFT substrate in accordance with one embodiment. 
         FIG. 4  is a schematic view of one pixel cell of the TFT substrate of  FIG. 3 . 
         FIG. 5  is a cross section view of the pixel cell of  FIG. 4  along the dashed line “EF”. 
         FIG. 6  is an enlarged view of the area A of  FIG. 5 . 
         FIG. 7  is an enlarged view of the area B of  FIG. 5 . 
         FIG. 8  shows the masking effect of the BM  101  when the panel assembled by the TFT substrate has been curved. 
         FIG. 9  is a cross section view of the pixel cell of  FIG. 4  along the dashed line “CD”. 
         FIG. 10  is a flowchart of the manufacturing method of the TFT substrate in accordance with one embodiment. 
         FIGS. 11-12  is a flowchart of the manufacturing method of the TFT substrate of  FIG. 10 . 
     
    
    
     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. 3  is a schematic view of the TFT substrate in accordance with one embodiment. The TFT substrate  10  includes a plurality of pixel cells  110 . The structure of the pixel cells  110  are substantially the same. The structure of an pixel cell  110  will be taken as an example hereinafter. 
       FIG. 4  is a schematic view of one pixel cell of the TFT substrate of  FIG. 3 .  FIG. 5  is a cross section view of the pixel cell of  FIG. 4  along the dashed line “EF”.  FIG. 6  is an enlarged view of the area A of  FIG. 5 .  FIG. 7  is an enlarged view of the area B of  FIG. 5 . Referring to  FIGS. 4 and 5 , the pixel cells  110  includes a substrate  11 , a gate electrode  12 , an active layer  14 , a BM  150 , a source electrode  16 , a drain electrode  17 , a second insulation layer  18 , and a pixel electrode  19 . 
     The gate electrode  12  is arranged on the substrate  11 . The data line  13  and the active layer  14  are arranged on the gate electrode  12  in turn. The BM  150  is arranged on the active layer  14 . The source electrode  16  and the drain electrode  17  are arranged on the BM  150 . The second insulation layer  18  is arranged on the source electrode  16  and the drain electrode  17 . The pixel electrode  19  may be Indium Tin Oxide (ITO) transparent electrode arranged on the second insulation layer  18 . The pixel electrode  19  electrically connects to the drain electrode  17  via the second insulation layer  18 . In other embodiments, the pixel electrode  19  may electrically connect to the source electrode  16  via the second insulation layer  18 . 
     Thus, in the embodiment, as the BM  150  is arranged on the side of the TFT substrate  10 , the masking effect of the BM  150  may not be affected when the panel assembled by the TFT substrate  10  has been curved. As shown in  FIG. 8 , the contrastness of the panel assembled by the TFT substrate  10  is enhanced. 
     On the other hand, as the BM  150  may be made by black resin material, and the manufacturing temperature of the active layer  14  is usually 400 degrees. Under the temperature, the black resin material may greatly aging and may be carbonized to cause fire. By arranging the BM  150  on the active layer  14 , the BM  150  is formed after the active layer  14  is formed so as to avoid the above aging or fire issue. Not only the manufacturing process may be smoothly conducted, but also the performance of the BM  150  may be ensured. 
       FIG. 9  is a cross section view of the pixel cell of  FIG. 4  along the dashed line “CD”. As shown in  FIGS. 4 and 9 , the pixel cell  110  of the TFT substrate  10  also include a scanning line (S), a data line (D), and a BM  151 . 
     The scanning line (S) is arranged on the substrate  11  and is arranged on the same layer with the gate electrode  12 . The data line  13  covers the scanning line (S). The active layer  14  has not covered the scanning line (S). The BM  151  is arranged on the scanning line (S) and is arranged on the same layer with the BM  150 . The data line (D) is arranged on the BM  151 , and is arranged on the same layer with the source electrode  16  and the drain electrode  17 . In the embodiment, as the data line  13  covers the scanning line (S), the BM  151  is arranged on the data line  13 . In the embodiment, as the BM  151  is arranged between the data line (D) and the scanning line (S), the insulation between the data line (D) and the scanning line (S) has been increased, which decreases the coupling capacitance between the data line (D) and the scanning line (S). As such, the stability of the transmission between the data line (D) and the scanning line (S) is enhanced. 
     Also referring to  FIG. 5 , the pixel cell  110  of the TFT substrate  10  further includes capacitance electrodes  111 ,  112  forming a common capacitance. The capacitance electrode  112  is arranged on the substrate  11 , and is arranged on the same layer with the scanning line (S) and the gate electrode  12 . The data line  13  further covers the capacitance electrode  112 . The BM  151  is arranged on a corresponding capacitance electrode  112  of the first insulation layer  13 . The capacitance electrode  111  is arranged on the BM  151 , and is arranged on the same layer with the source electrode  16  and the drain electrode  17 . The second insulation layer  18  further covers the capacitance electrode  111 . The pixel electrode  19  electrically connects to the capacitance electrode  111  via the second insulation layer  18 . 
     Also referring to  FIGS. 6 and 7 , the BM  150  and the BM  151  are respectively formed with contacting holes M 1 , M 2  such that the source electrode  16  and the drain electrode  17  contact with the active layer  14  via the contacting hole M 1  on the BM  150 . In addition, the capacitance electrode  111  contact with the first insulation layer  13  via the contacting hole M 2  on the BM  151 . 
     In the embodiment, the TFT substrate  10  further includes a photoresist layer  113  and an insulation protection layer  114 . The photoresist layer  113  is arranged between the second insulation layer  18  and the pixel electrode  19 . The insulation protection layer  114  is arranged between the photoresist layer  113  and the pixel electrode  19 . The photoresist layer  113  is made by red (R), green (G), and blue (B) materials. As the insulation protection layer  114  is formed on the photoresist layer  113 , the photoresist layer  113  and the components covered by the photoresist layer  113  may be well protected. 
     A first contacting hole M 3  and a second contacting hole M 4  are respectively formed are formed in locations on the photoresist layer  113  corresponding to the drain electrode  17  and the capacitance electrode  111 . The second insulation layer  18  is exposed by the first contacting hole M 3 . The second contacting hole M 4  passes through the second insulation layer  18  such that the capacitance electrode  111  is exposed. 
     The insulation protection layer  114  is arranged within the first contacting hole M 3  and the second contacting hole M 4 . The insulation protection layer  114  within the first contacting hole M 3  and the second insulation layer  18  form a third contacting hole M 5 . The third contacting hole M 5  exposes the drain electrode  17 . The insulation protection layer  114  within the second contacting hole M 4  is arranged on the second insulation layer  18  in which the second contacting hole M 4  has not been covered. The pixel electrode  19  electrically connects to the drain electrode  17  via the third contacting hole M 5 . In addition, the pixel electrode  19  electrically connects to the capacitance electrode  111  via the second contacting hole M 4 . 
     In other embodiments, the first contacting hole M 3  may be formed in a location on the photoresist layer  113  corresponding to the source electrode  16  so as to expose the second insulation layer  18 . Similarly, the third contacting hole M 5  is arranged corresponding to the location of the source electrode  16 . The third contacting hole M 5  exposes the source electrode  16 . The pixel electrode  19  electrically connects to the source electrode  16  via the third contacting hole M 5 . 
     As stated above, in the embodiment, as the BM  150  is arranged on the side of the TFT substrate  10 , the masking effect of the BM  150  may not be affected when the panel assembled by the TFT substrate  10  has been curved. As shown in  FIG. 8 , the contrastness of the panel assembled by the TFT substrate  10  is enhanced. 
     On the other hand, as the BM  151  is arranged between the data line (D) and the scanning line (S), the insulation between the data line (D) and the scanning line (S) has been increased, which decreases the coupling capacitance between the data line (D) and the scanning line (S). As such, the stability of the transmission between the data line (D) and the scanning line (S) is enhanced. 
       FIG. 10  is a flowchart of the manufacturing method of the TFT substrate in accordance with one embodiment.  FIGS. 11-12  is a flowchart of the manufacturing method of the TFT substrate of  FIG. 10 . 
     In block S 1 , a substrate  11  is provided. In block S 2 , the gate electrode  12  is formed on the substrate  11 . In addition, as shown in  FIG. 12 , the capacitance electrode  112  and the scanning line (S) being arranged on the same layer with the gate electrode  12  is formed on the substrate  11   
     In block S 3 , the first insulation layer  13  and the active layer  14  are formed on the gate electrode  12  in turn. In addition, the first insulation layer  13  further covers the capacitance electrode  112  and the scanning line (S). The active layer  14  has not covered the capacitance electrode  112  and the scanning line (S). 
     In block S 4 , the BM  150  is formed on the active layer  14 . In addition, the BM  151  being arranged on the same layer with the BM  150  is formed on the scanning line (S) and the capacitance electrode  112 . As the first insulation layer  13  covers the capacitance electrode  112  and the scanning line (S), the BM  151  being arranged on the same layer with the BM  150  is respectively formed on the first insulation layer  13  corresponding to the scanning line (S) and the capacitance electrode  112 . 
     In block S 5 , the source electrode  16  and the drain electrode  17  are formed on the BM  150 . In addition, as shown in  FIG. 12 , the data line (D) and the capacitance electrode  111  being arranged on the same layer with the source electrode  16  and the drain electrode  17  are formed on the BM  151 . 
     In block S 4 , the BM  150  and the BM  151  are respectively formed with contacting holes M 1 , M 2  such that the source electrode  16  and the drain electrode  17  contact with the active layer  14  via the contacting hole M 1  on the BM  150 . In addition, the capacitance electrode  111  contact with the first insulation layer  13  via the contacting hole M 2  on the BM  151 . 
     In block S 6 , the second insulation layer  18  is formed on the source electrode  16  and the drain electrode  17 . The second insulation layer  18  covers the data line (D) and the capacitance electrode  111 . 
     In block S 7 , the pixel electrode  19  is formed on the second insulation layer  18 . The pixel electrode  19  electrically connects to the source electrode  16  or the drain electrode  17  via the second insulation layer  18 . 
     In the embodiment, the pixel electrode  19  electrically connects to the drain electrode  17  via the second insulation layer  18 . The pixel electrode  19  electrically connects to the capacitance electrode  111  via the second insulation layer  18 . 
     In addition, before the pixel electrode  19  is formed, the photoresist layer  113  is formed on the second insulation layer  18 . The insulation protection layer  114  is formed on the photoresist layer  113 . Lastly, the pixel electrode  19  is formed on the insulation protection layer  114 . That is, the photoresist layer  113  is formed between the pixel electrode  19  and the second insulation layer  18 . The insulation protection layer  114  is formed between the photoresist layer  113  and the insulation protection layer  114 . As the insulation protection layer  114  is formed on the photoresist layer  113 , the photoresist layer  113  and the components covered by the photoresist layer  113  may be well protected. 
     In the embodiment, the pixel electrode  19  electrically connects to the drain electrode  17  and to the capacitance electrode  111  via the second insulation layer  18 . The detailed steps will be described hereinafter. 
     A first contacting hole M 3  and a second contacting hole M 4  are formed are respectively formed in locations on the photoresist layer  113  respectively corresponding to the drain electrode  17  and the capacitance electrode  111 . The second insulation layer  18  is exposed by the first contacting hole M 3 . The second contacting hole M 4  passes through the second insulation layer  18  such that the capacitance electrode  111  is exposed. 
     When the insulation protection layer  114  is formed on the photoresist layer  113 , the insulation protection layer  114  is arranged within the first contacting hole M 3  and the second contacting hole M 4  at the same time. The insulation protection layer  114  within the first contacting hole M 3  and the second insulation layer  18  form a third contacting hole M 5 . The third contacting hole M 5  exposes the drain electrode  17 . The insulation protection layer  114  within the second contacting hole M 4  is arranged on the second insulation layer  18  in which the second contacting hole M 4  has not been covered. The pixel electrode  19  electrically connects to the drain electrode  17  via the third contacting hole M 5 . In addition, the pixel electrode  19  electrically connects to the capacitance electrode  111  via the second contacting hole M 4 . 
     In other embodiments, the first contacting hole M 3  may be formed in a location on the photoresist layer  113  corresponding to the source electrode  16  such that the third contacting hole M 5  corresponds to the location of the source electrode  16 . In this way, the pixel electrode  19  electrically connects to the source electrode  16  via the third contacting hole M 5 . 
     In view of the above, in the embodiment, as the BM  150  is arranged on the side of the TFT substrate  10 , the masking effect of the BM  150  may not be affected when the panel assembled by the TFT substrate  10  has been curved. As shown in  FIG. 8 , the contrastness of the panel assembled by the TFT substrate  10  is enhanced. 
     On the other hand, as the BM  150 ,  151  may be made by black resin material, and the manufacturing temperature of the active layer  14  is usually 400 degrees. Under the temperature, the black resin material may greatly aging and may be carbonized to cause fire. By arranging the BM  150 ,  151  on the active layer  14 , the BM  150 ,  151  are formed after the active layer  14  is formed so as to avoid the above aging or fire issue. Not only the manufacturing process may be smoothly conducted, but also the performance of the BM  150 ,  151  may be ensured. 
     In addition, as the BM  151  is arranged between the data line (D) and the scanning line (S), the insulation between the data line (D) and the scanning line (S) has been increased, which decreases the coupling capacitance between the data line (D) and the scanning line (S). As such, the stability of the transmission between the data line (D) and the scanning line (S) is enhanced. 
     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.

Technology Category: 5