Patent Publication Number: US-2016246140-A1

Title: Array substrate and display device

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The present application claims benefit of Chinese patent application CN 201410834652.5, entitled “Array Substrate and Display Device” and filed on Dec. 26, 2014, the entirety of which is incorporated herein by reference. 
     FIELD OF THE INVENTION 
     The present disclosure relates to the technical field of display, and particularly to an array substrate and a display device. 
     BACKGROUND OF THE INVENTION 
     With the development of display technology, the liquid crystal display device has become the most commonly used display device. 
     The Vertical Alignment (VA) liquid crystal display device is a common liquid crystal display device. At present, in order to eliminate the color shift phenomena under wide viewing angles of the VA liquid crystal display device, each pixel unit can be separated into a main pixel region and a sub pixel region, and additionally provided with a voltage-dividing capacitor. 
     As shown in  FIGS. 1 and 2 , a voltage-dividing capacitor Cdown is formed by a part of a common electrode line (Com)  3  and a voltage-dividing electrode  2  that are arranged in an overlapping manner. During display, a first transistor T 1  and a second transistor T 2  are both turned on by a driving scanning line (Gate 1 )  11 , and a main pixel electrode (not shown in  FIG. 1 or 2 ) in a main pixel region  100  and a sub pixel electrode (not shown in  FIG. 1 or 2 ) in a sub pixel region  200  are charged with a same electric potential by a date line (Data)  4 . And then, a third transistor T 3  is turned on by a voltage-dividing scanning line (Gate 2 )  12 , and a voltage of the sub pixel electrode is divided by the voltage-dividing capacitor, so that the electric potential of the sub pixel electrode is lower than that of the main pixel electrode. In this case, a brightness of the sub pixel region  200  is slightly lower than that of the main pixel region  100 , and a deflection angle of the liquid crystal molecules in the main pixel region  100  is different from that in the sub pixel region  200 . Therefore, the color shift phenomena under wide viewing angles of the VA liquid crystal display device can be alleviated. 
     However, since the common electrode line  3  and the voltage-dividing electrode  2  are both made of metal materials, an aperture ratio of the pixel unit would be affected by the voltage-dividing capacitor. Especially under the development trend that the resolution is becoming increasingly high, and the area of the pixel unit is becoming increasingly small nowadays, the influence of the traditional voltage-dividing capacitor on the aperture ratio is becoming more obvious. 
     SUMMARY OF THE INVENTION 
     The purpose of the present disclosure is to provide an array substrate and a display device so as to solve the technical problem that the aperture ratio of the pixel unit is affected by the voltage-dividing capacitor in the prior art. 
     The present disclosure provides an array substrate, which comprises a plurality of pixel units, and each of said pixel units comprises a main pixel region, a sub pixel region, a first voltage-dividing capacitor, a driving scanning line, and a voltage-dividing scanning line, 
     wherein said first voltage-dividing capacitor is formed by a voltage-dividing electrode and said driving scanning line that are arranged in an overlapping manner, or by a voltage-dividing electrode and said voltage-dividing scanning line that are arranged in an overlapping manner. 
     Further, said pixel unit further comprises a second voltage-dividing capacitor and a common electrode line; and said second voltage-dividing capacitor is formed by said voltage-dividing electrode and said common electrode line that are arranged in an overlapping manner. 
     Preferably, said driving scanning line, said voltage-dividing scanning line and said common electrode line are arranged in a same layer during patterning. 
     Further, said pixel unit further comprises a data line, and said voltage-dividing electrode and said data line are arranged in a same layer during patterning. 
     Further, said pixel unit is further provided with a first transistor, a second transistor, and a third transistor; 
     wherein a gate of said first transistor is connected with said driving scanning line, a source thereof is connected with said data line, and a drain thereof is connected with a main pixel electrode in said main pixel region; 
     wherein a gate of said second transistor is connected with said driving scanning line, a source thereof is connected with said data line, and a drain thereof is connected with a sub pixel electrode in said sub pixel region; and 
     wherein a gate of said third transistor is connected with said voltage-dividing scanning line, a source thereof is connected with said sub pixel electrode, and a drain thereof is connected with said voltage-dividing electrode. 
     Preferably, the drain of said third transistor is integrated with said voltage-dividing electrode. 
     The present disclosure further provides a display device, which comprises a color filter substrate and the aforesaid array substrate. 
     Preferably, said display device is a vertical alignment display device. 
     The following beneficial effects can be brought about according to the present disclosure. In the array substrate according to the present disclosure, the first voltage-dividing capacitor of the pixel unit is formed by the voltage-dividing electrode and the driving scanning line that are arranged in an overlapping manner, or by the voltage-dividing electrode and the voltage-dividing scanning line that are arranged in an overlapping manner, rather than by the voltage-dividing electrode and the common electrode line that are arranged in an overlapping manner. In this manner, the area of the common electrode line in the pixel unit can be reduced, while the area of the driving scanning line and that of the voltage-dividing scanning line will not be increased. Therefore, the aperture ratio of the pixel unit can be improved, and thus the technical problem that the aperture ratio of the pixel unit is affected by the voltage-dividing capacitor in the prior art can be solved. 
     Other features and advantages of the present disclosure will be further explained in the following description, and partially become self-evident therefrom, or be understood through the embodiments of the present disclosure. The objectives and advantages of the present disclosure will be achieved through the structure specifically pointed out in the description, claims, and the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The drawings necessary for explaining the embodiments according to the present disclosure are introduced briefly below to illustrate the technical solutions of these embodiments more clearly. 
         FIG. 1  is a schematic diagram of a pixel unit in an array substrate in the prior art; 
         FIG. 2  is a circuit diagram of the pixel unit in the array substrate in the prior art; 
         FIG. 3  is a schematic diagram of a pixel unit in an array substrate provided by Embodiment 1 of the present disclosure; 
         FIG. 4  is a circuit diagram of the pixel unit in the array substrate provided by Embodiment 1 of the present disclosure; 
         FIG. 5  is a schematic diagram of a pixel unit in an array substrate according to another example provided by Embodiment 1 of the present disclosure; 
         FIG. 6  is a circuit diagram of the pixel unit in the array substrate according to another example provided by Embodiment 1 of the present disclosure; 
         FIG. 7  is a schematic diagram of a pixel unit in an array substrate provided by Embodiment 2 of the present disclosure; 
         FIG. 8  is a circuit diagram of the pixel unit in the array substrate provided by Embodiment 2 of the present disclosure; 
         FIG. 9  is a schematic diagram of a pixel unit in an array substrate according to another example provided by Embodiment 2 of the present disclosure; and 
         FIG. 10  is a circuit diagram of the pixel unit in the array substrate according to another example provided by Embodiment 2 of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     The present disclosure will be explained in details with reference to the embodiments and the accompanying drawings, whereby it can be fully understood how to solve the technical problem by the technical means according to the present disclosure and achieve the technical effects thereof, and thus the technical solution according to the present disclosure can be implemented. It should be noted that, as long as there is no structural conflict, all the technical features mentioned in all the embodiments may be combined together in any manner, and the technical solutions obtained in this manner all fall within the scope of the present disclosure. 
     Embodiment 1 
     The embodiment of the present disclosure provides an array substrate, which comprises a plurality of pixel units and can be used in VA liquid crystal display device. As shown in  FIGS. 3 and 4 , a pixel unit comprises a main pixel region  100 , a sub pixel region  200 , a first voltage-dividing capacitor Cdown 1 , a driving scanning line (Gate 1 )  11 , and a voltage-dividing scanning line (Gate 2 )  12 . The main pixel region  100  is provided with a main pixel electrode (not shown in  FIG. 3 or 4 ), and the sub pixel region  200  is provided with a sub pixel electrode (not shown in  FIG. 3 or 4 ). 
     According to the present embodiment, the first voltage-dividing capacitor is formed by a voltage-dividing electrode  2  and the driving scanning line  11  that are arranged in an overlapping manner. During display, a scanning is performed row by row by the driving scanning line  11  of the pixel unit in each row. Hence, at any moment, only one driving scanning line  11  has a high-level voltage. Moreover, a time period during which any driving scanning line  11  has the high-level voltage is rather short. That is, any driving scanning line  11  always has a low-level voltage almost. Therefore, the first voltage-dividing capacitor, which is formed by the voltage-dividing electrode  2  and the driving scanning line  11  that are arranged in an overlapping manner, can play the role of voltage-dividing on the sub pixel electrode satisfactorily. In this case, a brightness of the sub pixel region is slightly lower than that of the main pixel region, and a deflection angle of the liquid crystal molecules in the main pixel region is different from that in the sub pixel region. Therefore, the color shift phenomena under wide viewing angles of the VA liquid crystal display device can be alleviated. 
     According to the present embodiment, the pixel unit further comprises a common electrode line (Com)  3 , a data line (Data)  4 , a first transistor T 1 , a second transistor T 2 , and a third transistor T 3 . 
     In this structure, a gate of T 1  is connected with the driving scanning line  11 , a source thereof is connected with the data line  4 , and a drain thereof is connected with the main pixel electrode. In the main pixel region  100 , a main storage capacitor Cst 1  is formed between the main pixel electrode and the common electrode line  3 , and a main liquid crystal capacitor Clc 1  is formed between the main pixel electrode and a common electrode of the color filter substrate. 
     A gate of T 2  is connected with the driving scanning line  11 , a source thereof is connected with the data line  4 , and a drain thereof is connected with the sub pixel electrode. In the sub pixel region  200 , a sub storage capacitor Cst 2  is formed between the sub pixel electrode and the common electrode line  3 , and a sub liquid crystal capacitor Clc 2  is formed between the sub pixel electrode and the common electrode of the color filter substrate. 
     A gate of T 3  is connected with the voltage-dividing scanning line  12 , a source thereof is connected with the sub pixel electrode, and a drain thereof is connected with the voltage-dividing electrode  2 . The first voltage-dividing capacitor is formed between the voltage-dividing electrode  2  and the driving scanning line  11 . 
     As a preferred solution, the driving scanning line  11 , the voltage-dividing scanning line  12  and the common electrode line  3  are arranged in a same layer during patterning, and the voltage-dividing electrode  2  and the data line  4  are arranged in a same layer during patterning. During the manufacturing of the array substrate, the driving scanning line  11 , the voltage-dividing scanning line  12  and the common electrode line  3  can be formed through one single patterning procedure, and the voltage-dividing electrode  2  and the data line  4  can also be formed through one single patterning procedure. In this case, the manufacturing of the array substrate can be simplified. Since the sources and drains of T 1 , T 2 , and T 3  and the data line are arranged in a same layer during patterning, as a further preferred solution, the drain of T 3  can be integrated with the voltage-dividing electrode. 
     During display, the driving scanning line  11  is firstly turned on, while the voltage-dividing scanning line  12  is turned off, so that T 1  and T 2  are both turned on, while T 3  is turned off. At the same time, the main pixel electrode and the sub pixel electrode are charged with a same data voltage by the data line  4  through T 1  and T 2  respectively, and thus Clc 1 , Cst 1 , Clc 2 , and Cst 2  all have a same voltage. And then, the driving scanning line  11  is turned off, while the voltage-dividing scanning line  12  is turned on, so that T 1  and T 2  are both turned off, while T 3  is turned on. A voltage of the sub pixel electrode is divided by Cdown 1  through T 3 , and thus the data voltage of the sub pixel electrode can be reduced. Therefore, the voltage of Clc 2  and Cst 2  can be reduced, while the voltage of Clc 1  and Cst 1  is not changed. In this case, the voltage of Clc 2  is lower than that of Clc 1 , so that the brightness of the sub pixel region is slightly lower than that of the main pixel region, and the deflection angle of the liquid crystal molecules in the main pixel region is different from that in the sub pixel region. Hence, the color shift phenomena under wide viewing angles of the VA liquid crystal display device can be alleviated. 
     In the array substrate according to the embodiment of the present disclosure, the first voltage-dividing capacitor of the pixel unit is formed by the voltage-dividing electrode  2  and the driving scanning line  11  that are arranged in an overlapping manner, rather than by the voltage-dividing electrode  2  and the common electrode line  3  that are arranged in an overlapping manner. In this case, the area of the common electrode line  3  in the pixel unit can be reduced, while the area of the driving scanning line  11  is not increased. Therefore, the aperture ratio of the pixel unit can be improved, and thus the technical problem that the aperture ratio of the pixel unit is affected by the voltage-dividing capacitor in the prior art can be solved. 
     According to another example, the pixel unit may further comprise a second voltage-dividing capacitor Cdown 2 , as shown in  FIGS. 5 and 6 . The second voltage-dividing capacitor is formed by the voltage-dividing electrode  2  and the common electrode line  3  that are arranged in an overlapping manner. The voltage of the sub pixel electrode can be divided by the first voltage-dividing capacitor and the second voltage-dividing capacitor, so that the voltage of the sub pixel electrode can be further reduced, and the color shift phenomena under wide viewing angles of the VA liquid crystal display device can be alleviated to a greater extent. 
     Of course, the area of the common electrode line  3  which is used for forming the second voltage-dividing capacitor is also small. Compared with the prior art, the area of the common electrode line  3  can be still reduced significantly. Therefore, the aperture ratio of the pixel unit can be improved, and thus the technical problem that the aperture ratio of the pixel unit is affected by the voltage-dividing capacitor in the prior art can be solved. 
     Embodiment 2 
     The embodiment of the present disclosure provides an array substrate, which comprises a plurality of pixel units and can be used in VA liquid crystal display device. As shown in  FIGS. 7 and 8 , a pixel unit comprises a main pixel region  100 , a sub pixel region  200 , a first voltage-dividing capacitor Cdown 1 , a driving scanning line (Gate 1 )  11 , and a voltage-dividing scanning line (Gate 2 )  12 . The main pixel region  100  is provided with a main pixel electrode (not shown in  FIG. 7 or 8 ), and the sub pixel region  200  is provided with a sub pixel electrode (not shown in  FIG. 7 or 8 ). 
     According to the present embodiment, the first voltage-dividing capacitor is formed by a voltage-dividing electrode  2  and the voltage-dividing scanning line  12  that are arranged in an overlapping manner. During display, a scanning is performed row by row by the voltage-dividing scanning line  12  of the pixel unit in each row. Hence, at any moment, only one voltage-dividing scanning line  12  has a high-level voltage. Moreover, a time period during which any voltage-dividing scanning line  12  has the high-level voltage is rather short. That is, any voltage-dividing scanning line  12  always has a low-level voltage almost. Therefore, the first voltage-dividing capacitor, which is formed by the voltage-dividing electrode  2  and the voltage-dividing scanning line  12  that are arranged in an overlapping manner, can play the role of voltage-dividing on the sub pixel electrode satisfactorily. In this case, a brightness of the sub pixel region is slightly lower than that of the main pixel region, and a deflection angle of the liquid crystal molecules in the main pixel region is different from that in the sub pixel region. Therefore, the color shift phenomena under wide viewing angles of the VA liquid crystal display device can be alleviated. 
     According to the present embodiment, the pixel unit further comprises a common electrode line (Com)  3 , a data line (Data)  4 , a first transistor T 1 , a second transistor T 2 , and a third transistor T 3 . 
     In this structure, a gate of T 1  is connected with the driving scanning line  11 , a source thereof is connected with the data line  4 , and a drain thereof is connected with the main pixel electrode. In the main pixel region  100 , a main storage capacitor Cst 1  is formed between the main pixel electrode and the common electrode line  3 , and a main liquid crystal capacitor Clc 1  is formed between the main pixel electrode and a common electrode of the color filter substrate. 
     A gate of T 2  is connected with the driving scanning line  11 , a source thereof is connected with the data line  4 , and a drain thereof is connected with the sub pixel electrode. In the sub pixel region  200 , a sub storage capacitor Cst 2  is formed between the sub pixel electrode and the common electrode line  3 , and a sub liquid crystal capacitor Clc 2  is formed between the sub pixel electrode and the common electrode of the color filter substrate. 
     A gate of T 3  is connected with the voltage-dividing scanning line  12 , a source thereof is connected with the sub pixel electrode, and a drain thereof is connected with the voltage-dividing electrode  2 . The first voltage-dividing capacitor is formed between the voltage-dividing electrode  2  and the voltage-dividing scanning line  12 . 
     As a preferred solution, the driving scanning line  11 , the voltage-dividing scanning line  12  and the common electrode line  3  are arranged in a same layer during patterning, and the voltage-dividing electrode  2  and the data line  4  are arranged in a same layer during patterning. During the manufacturing of the array substrate, the driving scanning line  11 , the voltage-dividing scanning line  12  and the common electrode line  3  can be formed through one single patterning procedure, and the voltage-dividing electrode  2  and the data line  4  can also be formed through one single patterning procedure. In this case, the manufacturing of the array substrate can be simplified. Since the sources and drains of T 1 , T 2 , and T 3  and the data line are arranged in a same layer during patterning, as a further preferred solution, the drain of T 3  can be integrated with the voltage-dividing electrode. 
     During display, the driving scanning line  11  is firstly turned on, while the voltage-dividing scanning line  12  is turned off, so that T 1  and T 2  are both turned on, while T 3  is turned off. At the same time, the main pixel electrode and the sub pixel electrode are charged with a same data voltage by the data line  4  through T 1  and T 2  respectively, and thus Clc 1 , Cst 1 , Clc 2 , and Cst 2  all have a same voltage. And then, the driving scanning line  11  is turned off, while the voltage-dividing scanning line  12  is turned on, so that T 1  and T 2  are both turned off, while T 3  is turned on. A voltage of the sub pixel electrode is divided by Cdown 1  through T 3 , and thus the data voltage of the sub pixel electrode can be reduced. Therefore, the voltage of Clc 2  and Cst 2  can be reduced, while the voltage of Clc 1  and Cst 1  is not changed. In this case, the voltage of Clc 2  is lower than that of Clc 1 , so that the brightness of the sub pixel region is slightly lower than that of the main pixel region, and the deflection angle of the liquid crystal molecules in the main pixel region is different from that in the sub pixel region. Hence, the color shift phenomena under wide viewing angles of the VA liquid crystal display device can be alleviated. 
     In the array substrate according to the embodiment of the present disclosure, the first voltage-dividing capacitor of the pixel unit is formed by the voltage-dividing electrode  2  and the voltage-dividing scanning line  12  that are arranged in an overlapping manner, rather than by the voltage-dividing electrode  2  and the common electrode line  3  that are arranged in an overlapping manner. In this case, the area of the common electrode line  3  in the pixel unit can be reduced, while the area of the voltage-dividing scanning line  12  is not increased. Therefore, the aperture ratio of the pixel unit can be improved, and thus the technical problem that the aperture ratio of the pixel unit is affected by the voltage-dividing capacitor in the prior art can be solved. 
     According to another example, the pixel unit may further comprise a second voltage-dividing capacitor Cdown 2 , as shown in  FIGS. 9 and 10 . The second voltage-dividing capacitor is formed by the voltage-dividing electrode  2  and the common electrode line  3  that are arranged in an overlapping manner. The voltage of the sub pixel electrode can be divided by the first voltage-dividing capacitor and the second voltage-dividing capacitor, so that the voltage of the sub pixel electrode can be further reduced, and the color shift phenomena under wide viewing angles of the VA liquid crystal display device can be alleviated to a greater extent. 
     Of course, the area of the common electrode line  3  which is used for forming the second voltage-dividing capacitor is also small. Compared with the prior art, the area of the common electrode line  3  can be still reduced significantly. Therefore, the aperture ratio of the pixel unit can be improved, and thus b. 
     Embodiment 3 
     The embodiment of the present disclosure provides a display device, and preferably a VA display device, which can specifically be liquid crystal TV, liquid crystal display device, mobile phone, tablet personal computer, etc. The display device comprises a color filter substrate and the array substrate according to the embodiments of the present disclosure. 
     Since the display device provided by the embodiment of the present disclosure has the same technical features as the array substrate provided by the above Embodiment 1 or Embodiment 2, they can solve the same technical problem and achieve the same technical effect. 
     The above embodiments are described only for better understanding, rather than restricting, the present disclosure. Any person skilled in the art can make amendments to the implementing forms or details without departing from the spirit and scope of the present disclosure. The protection scope of the present disclosure shall be determined by the scope as defined in the claims.