Abstract:
An organic light emitting display device includes a display unit including a plurality of data lines, a plurality of scan lines, and pixels at crossing regions of the data lines and scan lines, wherein the plurality of data lines are arranged into a plurality of groups; a data driver for supplying data signals to the data lines; a first demultiplexer at a first side of the display unit for associating the groups to first corresponding output channels of the data driver, and for coupling the output channels to the data lines in the first corresponding groups in accordance with control signals; a second demultiplexer at a second side of the display unit opposite the first side for associating the groups to second corresponding output channels of the data driver, and for coupling the output channels to the data lines in the second corresponding groups in accordance with the control signals.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to and the benefit of Korean Patent Application No. 10-2008-0110315, filed on Nov. 7, 2008, in the Korean Intellectual Property Office, the entire content of which is incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an organic light emitting display device. 
     2. Description of Related Art 
     Recently, various types of flat panel display devices have been developed which have reduced weight and volume as compared to cathode ray tubes. The flat panel display devices include liquid crystal display devices, field emission display devices, plasma display devices, organic light emitting display devices, and others. 
     Among the flat panel display devices, organic light emitting display devices have excellent color reproducibility, slimness, and other advantages. Accordingly, it is widely used in a variety of applications such as PDAs and MP3 players, in addition to mobile phones. 
     An organic light emitting display device displays images using organic light emitting diodes (OLEDs) in which luminance is determined corresponding to an amount of current input to the OLEDs. 
     An organic light emitting diode includes an anode electrode, a cathode electrode, and a red, green or blue light emitting layer interposed between the anode and cathode electrodes. In the organic light emitting diode, luminance of light is determined depending on an amount of current flowing between the anode and cathode electrodes. 
     Red, green and blue light emitting layers are formed of different materials. Thus, although the same amount of current is applied to the red, green and blue light emitting layers, their light emitting efficiencies are different. Therefore, separate gammas are applied to the red, green and blue light emitting layers. 
     In a conventional organic light emitting display device, a data driver is generally positioned at a side of a panel, i.e., along an upper or lower portion of the panel. Here, the data driver applies data signals to respective pixels provided in the panel. When the data driver is positioned at a lower portion of the panel, it is assumed that the data driver has 33 pins, and the 33 pins are sequentially numbered from left to right. Then, red, green and blue data are repeatedly output sequentially from a first pin to a thirty-third pin. When the data driver is positioned at an upper portion of the panel, the order of pin numbers is changed, and red, green and blue data are repeatedly output sequentially from the thirty-third pin to the first pin. 
     At this time, separate gammas are applied to the respective pins. When the data driving unit is positioned at the lower portion of the panel, a red gamma is applied to a first pin, a fourth pin, a seventh pin, . . . , a green gamma is applied to a second pin, a fifth pin, an eighth pin, . . . , and a blue gamma is applied to a third pin, a sixth pin, a ninth pin, . . . . That is, gammas suitable for the respective colors are applied to data output through respective lines. 
     However, when the same data driver is positioned at an upper portion of the panel, the order of the pin numbers is changed. Therefore, colors of data do not correspond to the gammas. That is, the red gamma is applied to the first pin, the fourth pin, the seventh pin, . . . , the green gamma is applied to the second pin, the fifth pin, the eighth pin, . . . , and the blue gamma is applied to the third pin, the sixth pin, the ninth pin, . . . . However, blue data are output through the first pin, the fourth pin, the seventh pin, . . . , green data are output through the second pin, the fifth pin, the eighth pin, . . . , and red data are output through the third pin, the sixth pin, the ninth pin, . . . . Therefore, when this data driver is positioned at the upper portion of the panel, luminance and/or white balance is compromised. Accordingly, the data driver is designed differently depending on positions of the panel in which the data driver is mounted. For this reason, manufacturing cost is increased. 
     SUMMARY OF THE INVENTION 
     Accordingly, exemplary embodiments of the present invention provide an organic light emitting display device which allows a position of a data driver mounted in the display device to be freely set. 
     An aspect according to an exemplary embodiment of the present invention provides an organic light emitting display device, including a display unit including a plurality of data lines, a plurality of scan lines, and pixels at crossing regions of the plurality of data lines and the plurality of scan lines, wherein the plurality of data lines are arranged into a plurality of groups; a data driver for supplying red, green and blue data signals to the plurality of data lines; a first demultiplexer at a first side of the display unit, the first demultiplexer for associating each of the groups to first corresponding output channels of the data driver, and for coupling the output channels to the data lines in the first corresponding groups in accordance with control signals; a second demultiplexer at a second side of the display unit opposite the first side, the second demultiplexer for associating each of the groups to second corresponding output channels of the data driver, and for coupling the output channels to the data lines in the second corresponding groups in accordance with the control signals; and a controller for outputting the control signals, wherein the data driver is at the first side and coupled to the first demultiplexer, or at the second side and coupled to the second demultiplexer. 
     The data driver may sequentially output red, green and blue data signals through the output channels during a horizontal period. 
     When the data driver configured to be at the first side and coupled to the first demultiplexer is positioned at the second side and coupled to the second demultiplexer, the data driver may sequentially output blue, green and red data signals through the output channels during a horizontal period. 
     The first demultiplexer may include first, second and third transistors, wherein the first transistor is coupled to a data line corresponding to a red pixel of the pixels from among the plurality of data lines, the second transistor is coupled to a data line corresponding to a green pixel of the pixels from among the plurality of data lines, and the third transistor is coupled to a data line corresponding to a blue pixel of the pixels from among the plurality of data lines. The second demultiplexer may include fourth, fifth and sixth transistors, wherein the fourth transistor is coupled to the data line corresponding to the red pixel, the fifth transistor is coupled to the data line corresponding to the green pixel, and the sixth transistor is coupled to the data line corresponding to the blue pixel. The first and fourth transistors may concurrently turn on and off, the second and fifth transistors may concurrently turn on and off, and the third and sixth transistors may concurrently turn on and off. 
     The controller may be configured to determine an order in which the first and fourth transistors, the second and fifth transistors, and the third and sixth transistors turn on and off in accordance with a position of the data driver. 
     The first demultiplexer may include first, second and third transistors, wherein the first transistor is coupled to a data line corresponding to a red pixel of the pixels from among the plurality of data lines, the second transistor is coupled to a data line corresponding to a green pixel of the pixels from among the plurality of data lines, and the third transistor is coupled to a data line corresponding to a blue pixel of the pixels from among the plurality of data lines. The second demultiplexer may include fourth, fifth and sixth transistors, wherein the fourth transistor is coupled to the data line corresponding to the red pixel, the fifth transistor is coupled to the data line corresponding to the green pixel, and the sixth transistor is coupled to the data line corresponding to the blue pixel. The first and sixth transistors may concurrently turn on and off, the second and fifth transistors may concurrently turn on and off, and the third and fourth transistors may concurrently turn on and off. 
     The controller may be configured to determine an order in which the first and sixth transistors, the second and fifth transistors, and the third and fourth transistors turn on and off in accordance with a position of the data driver. 
     An aspect according to another exemplary embodiment of the present invention provides an organic light emitting display device, including: a display unit including a plurality of data lines, a plurality of scan lines, and pixels at crossing regions of the plurality of data lines and the plurality of scan lines; a controller for supplying control signals; a data driver for supplying data signals to the plurality of data lines; a first demultiplexer at a first side of the display unit and connected to the plurality of data lines, the first demultiplexer configured to couple the data driver to the plurality of data lines in accordance with the control signals; and a second demultiplexer at a second side of the display unit opposite the first side and connected to the plurality of data lines, the second demultiplexer configured to couple the data driver to the plurality of data lines in accordance with the control signals; wherein the data driver is connected to the first demultiplexer or the second demultiplexer, and wherein the controller controls the first demultiplexer or the second demultiplexer to sequentially supply the data signals from the data driver to the plurality of data lines in a correct order. 
     Accordingly, in an organic light emitting display device and a driving method thereof according to the present invention, a position at which the data driver is mounted in the display device can be freely set. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings illustrate exemplary embodiments of the present invention, and, together with the description, serve to explain the principles of the present invention. 
         FIG. 1  is a schematic block diagram showing the structure of an organic light emitting display device according to an embodiment of the present invention. 
         FIG. 2  shows a first embodiment of a connection of first and second demultiplexer units employed in the organic light emitting display device according to aspects of the present invention. 
         FIG. 3  is a timing diagram showing signals input to the organic light emitting display device of  FIG. 2 . 
         FIG. 4  shows a second embodiment of the connection of the first and second demultiplexer units employed in the organic light emitting display device according to aspects of the present invention. 
         FIG. 5  is a timing diagram showing signals input to the organic light emitting display device of  FIG. 4 . 
     
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereinafter, certain exemplary embodiments according to the present invention will be described with reference to the accompanying drawings. Here, when a first element is described as being coupled to a second element, the first element may be directly coupled to the second element or may be indirectly coupled to the second element via one or more additional elements. Further, some of the elements that are not essential to the complete understanding of the invention are omitted for clarity. Also, like reference numerals refer to like elements throughout. 
       FIG. 1  is a schematic block diagram showing the structure of an organic light emitting display device according to an embodiment of the present invention. 
     Referring to  FIG. 1 , the organic light emitting display device includes a display unit  100 , a data driver  200 , a scan driver  300 , a first demultiplexer unit  410 , a second demultiplexer unit  420  and a controller  500 . 
     A plurality of pixels  101  are arranged in the display unit  100 , and each of the pixels  101  includes an organic light emitting diode (not shown). The display unit  100  includes n scan lines S 1 , S 2 , . . . , Sn−1 and Sn, and m data lines D 1 , D 2 , . . . , Dm−1 and Dm. Here, the n scan lines S 1 , S 2 , . . . , Sn−1 and Sn extend in a row direction and supply scan signals. The m data lines D 1 , D 2 , . . . , Dm−1 and Dm extend in a column direction and supply data signals. 
     The display unit  100  is driven by receiving first and second power sources. In the display unit  100 , current flows through the organic light emitting diodes by utilizing scan signals, data signals, light emission signals and the first and second power sources, so that the display unit  100  emits light to display images. The plurality of pixels includes red, green and blue sub-pixels, R, G and B. 
     The data driver  200  generates data signals using image signals (R, G and B data signals) having red, green and blue components. The data driver  200  applies data signals output through output channels O 1 , O 2 , . . . , Ok−1 and Ok to the display unit  100 . Here, the output channels O 1 , O 2 , . . . , Ok−1 and Ok are connected to the data lines D 1 , D 2 , . . . , Dm−1 and Dm of the display unit  100 . The data driver  200  sequentially outputs three data signals from each output channel. That is, red, green and blue data signals are sequentially output from each output channel of the data driver  200 , so that the number of output channels of the data driver  200  can be decreased. 
     The data driver  200  is positioned above or below the display unit  100 . When the data driver  200  is positioned below the display unit  100  as shown in  FIG. 1 , the data driver  200  is coupled to the display unit  100  through the first demultiplexer unit  410 . When the data driver  200  is positioned above the display unit  100 , the data driver  200  is coupled to the display unit  100  through the second demultiplexer  420 . 
     In the embodiment of the present invention, the data driver  200  positioned below the display unit  100  will be described as an example. 
     The scan driver  300  generates scan signals. The scan driver  300  is connected to the scan lines S 1 , S 2 , . . . , Sn−1 and Sn, and supplies a scan signal to specific rows of the display unit  100 . A data signal output from the data driver  200  is supplied to a pixel  101  receiving the scan signal, and a voltage corresponding to the data signal is applied to the pixel  101 . 
     Each of the first and second demultiplexer units includes a plurality of demultiplexers. The respective demultiplexers divide the plurality of data lines into a plurality of groups, and each of the groups is coupled to an output channel of the data driver  200  through a demultiplexer. In other words, an output channel of the data driver  200  is coupled to a demultiplexer so that the output channel is coupled to three data lines through the demultiplexer. Data signals of three different colors are output from the output channel, and each of the data signals is supplied to a corresponding data line by the demultiplexer. 
     Operations of the first and second demultiplexer units  410  and  420  will now be described. When red, green and blue data signals are output from an output channel of the data driver  200 , the first or second demultiplexer unit  410  or  420  time-divisionally controls a connection sequence between the plurality of data lines and the output channels in accordance with timing of the output data signals, so that the red, green and blue data signals output from the output channel are transmitted to data lines coupled to red, green and blue pixels, respectively. Therefore, although red, green and blue gammas are individually used, red data are provided only to red pixels, green data are provided only to green pixels, and blue data are provided only to blue pixels, depending on operation of the first or second demultiplexer  410  or  420 . Accordingly, luminance or white balance is not lost due to the mismatch of gammas. 
     The controller  500  controls the first and second demultiplexer units  410  and  420 . The controller  500  generates control signals depending on whether the data driver  200  is positioned above or below the display unit  100 . Accordingly, the controller  500  controls data signals output from the data driver  200  to be applied to data lines coupled to the pixels. 
     Hereinafter, a connection of the display unit  100 , the first and second demultiplexer units  410  and  420  and the data driver  200  will be described in detail. 
     Each of the plurality of pixels constituting the display unit  100  includes three sub-pixels, i.e., red, green and blue sub-pixels, R, G and B. The respective sub-pixels R, G and B are coupled to data lines and receive data signals through the data lines, respectively. 
     The respective pixels  101  have red, green and blue sub-pixels, R, G and B repeatedly positioned from left to right of the display unit  100 . 
     The data driver  200  is coupled to the display unit  100  in one of two configurations. In a first configuration, the output channels O 1 , O 2 , . . . , Ok−1 and Ok of the data driver  200  sequentially output red, green and blue data signals. In a second configuration, the output channels O 1 , O 2 , . . . , Ok−1 and Ok of the data driver  200  sequentially output blue, green and red data signals. 
     In the first configuration, the data driver  200  is positioned below the display unit  100 . In the second configuration, the data driver  200  is positioned above the display unit  100 . Here, since the data driver  200  is designed to be positioned above the pixel unit  100  in the second configuration, the order of the output channels numbered from left to right is reversed as compared to the first configuration. 
     In the first configuration, the output channels of the data driver  200  are arranged from left to right in the order of a first output channel, a second output channel, . . . , a (k−1)-th output channel and a k-th output channel, O 1 , O 2 , . . . , Ok−1 and Ok. In the display unit  100 , red, green and blue pixels are repeatedly positioned from left to right of the display unit  100 . Therefore, if red, green and blue data are sequentially output from an output channel, the first demultiplexer unit  410  allows the red, green and blue data to be respectively provided to red, green and blue pixels, R, G and B. 
     However, in the second configuration, the operation of the data driver  200  is reversed as compared to the first configuration. Therefore, the output channels of the data driver  200  are arranged from left to right directions in the order of a k-th output channel, a (k−1)-th output channel, . . . , a second output channel and a first output channel, Ok, Ok−1, . . . , O 2  and O 1 . If red, green and blue data are sequentially output from an output channel, the second demultiplexer unit  420  allows the red, green and blue data to be respectively provided to red, green and blue pixels, R, G and B. Further, if blue, green and red data are sequentially output from an output channel, the second demultiplexer unit  420  allows the blue, green and red data to be respectively provided to blue, green and red pixels, B, G and R through control of the controller  500 . 
     That is, red, green and blue data output from an output channel are respectively provided to red, green and blue pixels R, G and B by an operation of either the first or second demultiplexer unit  410  or  420 , regardless of the position of the data driver  200 . 
     Therefore, red, green and blue gammas are correctly applied to the red, green and blue data regardless of the position of the data driver  200 . Accordingly, suitable gammas are respectively applied to data signals and pixels, so that white balance is not lost. 
       FIG. 2  shows a first embodiment of a connection of the first and second demultiplexer units employed in the organic light emitting display device according to aspects of the present invention.  FIG. 3  is a timing diagram showing signals input to the organic light emitting display device of  FIG. 2 . The connection of the first and second demultiplexer units  410  and  420  will be described below with reference to  FIGS. 2 and 3 . 
     In the first embodiment, red, green and blue data are sequentially output from an output channel regardless of the position of the data driver  200 . 
     The first demultiplexer unit  410  is formed below the display unit  100  and includes first to third transistors, M 1 , M 2  and M 3 . 
     A first electrode of the first transistor M 1  is coupled to an output channel O 1  through which data signals are output, and a second electrode of the first transistor M 1  is coupled to a data line coupled to a red pixel R. A gate electrode of the first transistor M 1  is coupled to a first control line CS 1  through which a first control signal CS 1   n  is supplied. 
     A first electrode of the second transistor M 2  is coupled to the output channel O 1 , and a second electrode of the second transistor M 2  is coupled to a data line coupled to a green pixel G. A gate electrode of the second transistor M 2  is coupled to a second control line CS 2  through which a second control signal CS 2   n  is supplied. 
     A first electrode of the third transistor M 3  is the output channel O 1 , and a second electrode of the third transistor M 3  is coupled to a data line coupled to a blue pixel B. A gate electrode of the third transistor M 3  is coupled to a third control line CS 3  through which a third control signal CS 3   n  is supplied. 
     The second demultiplexer unit  420  is formed above the display unit  100  and includes fourth to sixth transistors, M 4 , M 5  and M 6 . 
     A first electrode of the fourth transistor M 4  is coupled to an output channel Ok through which data signals are output, and a second electrode of the fourth transistor M 4  is coupled to a data line coupled to a red pixel R. A gate electrode of the fourth transistor M 4  is coupled to the first control line CS 1  through which the first control signal CS 1   n  is supplied. 
     A first electrode of the fifth transistor M 5  is coupled to the output channel Ok, and a second electrode of the fifth transistor M 5  is coupled to a data line coupled to a green pixel G. A gate electrode of the fifth transistor M 5  is coupled to the second control line CS 2  through which the second control signal CS 2   n  is supplied. 
     A first electrode of the sixth transistor M 6  is coupled to the output channel Ok, and a second electrode of the sixth transistor M 6  is coupled to a data line coupled to a blue pixel B. A gate electrode of the sixth transistor M 6  is coupled to the third control line CS 3  through which the third control signal CS 3   n  is supplied. 
     The first and second electrodes of each of the transistors are source and drain electrodes. If the first electrode is a source electrode, the second electrode is a drain electrode. If the first electrode is a drain electrode, the second electrode is a source electrode. 
     Operations of the first and second demultiplexer unit  410  and  420  will now be described. The first, second and third control signals CS 1   n , CS 2   n  and CS 3   n  sequentially become low states when a scan signal SIn maintains a low state, which occurs after a horizontal synchronization signal Hsync becomes a low state. After that, the first, second and third control signals CS 1   n , CS 2   n  and CS 3   n  sequentially become low states again when a scan signal SIn again becomes a low state, after a subsequent horizontal synchronization signal Hsync becomes a low state. The data signals are divided into red, green and blue data signals, and each of the data signals is supplied while the corresponding one of the control signals maintains a low state. 
     First, when the first control signal CS 1   n  becomes a low state, the first and fourth transistors M 1  and M 4  are turned on. At this time, a red data signal is output to the output channels O 1  and Ok of the data driver  200 . If the data driver  200  is positioned below the display unit  100 , the red data signal is provided to a red pixel R through a data line via the first transistor M 1 . If the data driver  200  is positioned above the display unit  100 , the red data signal is provided to a red pixel R through a data line via the fourth transistor M 4 . 
     When the second control signal CS 2   n  becomes a low state, the second and fifth transistors M 2  and M 5  are turned on. At this time, a green data signal is output to the output channels O 1  and Ok of the data driver  200 . If the data driver  200  is positioned below the display unit  100 , the green data signal is provided to a green pixel G through a data line via the second transistor M 2 . If the data driver  200  is positioned above the display unit  100 , the green data signal is provided to a green pixel G through a data line via the fifth transistor M 5 . 
     When the third control signal CS 3   n  becomes a low state, the third and sixth transistors M 3  and M 6  are turned on. At this time, a blue data signal is output to the output channels O 1  and Ok of the data driver  200 . If the data driver  200  is positioned below the display unit  100 , the blue data signal is provided to a blue pixel G through a data line via the third transistor M 3 . If the data driver  200  is positioned above the display unit  100 , the blue data signal is provided to a blue pixel G through a data line via the sixth transistor M 6 . 
       FIG. 4  shows a second embodiment of the connection of the first and second demultiplexer units employed in the organic light emitting display device according to aspects of the present invention.  FIG. 5  is a timing diagram showing signals input to the organic light emitting display device of  FIG. 4 . The connection of the first and second demultiplexer units  410  and  420  will be described below with reference to  FIGS. 4 and 5 . 
     The order of red, green and blue data output from an output channel is reversed depending on whether the data driver  200  is positioned above or below the display unit  100 . 
     The first demultiplexer unit  410  is formed below the display unit  100  and includes first to third transistors, M 1 , M 2  and M 3 . 
     A first electrode of the first transistor M 1  is coupled to an output channel O 1  through which data signals are output, and a second electrode of the first transistor M 1  is coupled to a data line coupled to a red pixel R. A gate electrode of the first transistor M 1  is coupled to a first control line CS 1  through which a first control signal CS 1   n  is supplied. 
     A first electrode of the second transistor M 2  is coupled to the output channel O 1 , and a second electrode of the second transistor M 2  is coupled to a data line coupled to a green pixel G. A gate electrode of the second transistor M 2  is coupled to a second control line CS 2  through which a second control signal CS 2   n  is supplied. 
     A first electrode of the third transistor M 3  is coupled to the output channel O 1 , and a second electrode of the third transistor M 3  is coupled to a data line coupled to a blue pixel B. A gate electrode of the third transistor M 3  is coupled to a third control line CS 3  through which a third control signal CS 3   n  is supplied. 
     The second demultiplexer unit  420  is formed above the display unit  100  and includes fourth to sixth transistors, M 4 , M 5  and M 6 . 
     A first electrode of the fourth transistor M 4  is coupled to an output channel Ok through which data signals are output, and a second electrode of the fourth transistor M 4  is coupled to a data line coupled to a red pixel R. A gate electrode of the fourth transistor M 4  is coupled to the third control line CS 3  through which the third control signal CS 3   n  is supplied. 
     A first electrode of the fifth transistor M 5  is coupled to the output channel Ok, and a second electrode of the fifth transistor M 5  is coupled to a data line coupled to a green pixel G. A gate electrode of the fifth transistor M 5  is coupled to the second control line CS 2  through which the second control signal CS 2   n  is supplied. 
     A first electrode of the sixth transistor M 6  is coupled to the output channel Ok, and a second electrode of the sixth transistor M 6  is coupled to a data line coupled to a blue pixel B. A gate electrode of the sixth transistor M 6  is coupled to the first control line CS 1  through which the first control signal CS 1   n  is supplied. 
     Operations of the first and second demultiplexer unit  410  and  420  will now be described. The first, second and third control signals CS 1   n , CS 2   n  and CS 3   n  sequentially become low states when a scan signal SIn maintains a low state, which occurs after a horizontal synchronization signal Hsync becomes a low state. After that, the first, second and third control signals CS 1   n , CS 2   n  and CS 3   n  sequentially become low states again when a scan signal SIn again becomes a low state, after a subsequent horizontal synchronization signal Hsync becomes a low state. The data signals are divided into red, green and blue data signals, and each of the data signals is supplied while the corresponding one of the control signals maintains a low state. 
     First, when the first control signal CS 1   n  becomes a low state, the first and sixth transistors M 1  and M 6  are turned on. At this time, if the data driver  200  is positioned below the display unit  100 , a red data signal is output to the output channel O 1  of the data driver  200 . If the data driver  200  is positioned above the display unit  100 , a blue data signal is output to the output channel Ok of the data driver  200 . Therefore, if the data driver  200  is positioned below the display unit  100 , the red data signal is provided to a red pixel R through a data line via the first transistor M 1 . If the data driver  200  is positioned above the display unit  100 , the blue data is provided to a blue pixel B through a data line via the sixth transistor M 6 . 
     When the second control signal CS 2   n  becomes a low state, the second and fifth transistors M 2  and M 5  are turned on. At this time, a green data signal is output to the output channels O 1  and Ok of the data driver  200 , regardless of the position of the data driver  200 . If the data driver  200  is positioned below the display unit  100 , the green data signal is provided to a green pixel G through a data line via the second transistor M 2 . If the data driver  200  is positioned above the display unit  100 , the green data signal is provided to a green pixel G through a data line via the fifth transistor M 5 . 
     When the third control signal CS 3   n  becomes a low state, the third and fourth transistors M 3  and M 4  are turned on. At this time, if the data driver  200  is positioned below the display unit  100 , a blue data signal is output to the output channel O 1  of the data driver  200 . If the data driver  200  is positioned above the display unit  100 , a red data signal is output to the output channel Ok of the data driver  200 . Therefore, if the data driver  200  is positioned below the display unit  100 , the blue data signal is provided to a blue pixel B through a data line via the third transistor M 3 . If the data driver  200  is positioned above the display unit  100 , the red data signal is provided to a red pixel R through a data line via the fourth transistor M 4 . 
     While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but instead is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims, and equivalents thereof.