Patent Publication Number: US-10789872-B2

Title: Display apparatus with enhanced aperture ratio

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This U.S. non-provisional patent application claims priority under 35 U.S.C. §119 of Korean Patent Application No. 10-2015-0018859, filed on Feb. 6, 2015, the entire content of which is hereby incorporated by reference. 
     BACKGROUND 
     The present disclosure herein relates to a display apparatus, and more particularly, to a display apparatus that performs a data rendering operation. 
     Each pixel of a typical display apparatus includes three sub-pixels that display red, green, and blue colors, respectively. Such a structure is called an RGB-stripe structure. 
     Recently, a technique for enhancing luminance of a display apparatus using an RGBW structure in which one pixel includes four sub-pixels, that is, red, green, blue, and white sub-pixels is being developed. Furthermore, a technique for increasing an overall aperture ratio and a transmittance factor of a display apparatus using a structure designed such that two sub-pixels (two of R, G, B, and W sub-pixels) are formed in an area where each pixel of the RGB-stripe structure is formed is also being developed. 
     SUMMARY 
     The present disclosure provides a display apparatus having a higher transmittance factor and a higher aperture ratio. The present disclosure also provides a display apparatus having higher color reproduction. 
     The present disclosure also provides a display apparatus for performing a data rendering operation suitable for a new pixel structure. 
     Embodiments of the inventive concept provide a display apparatus including a display panel, a timing controller, a gate driver, and a data driver. 
     The display panel may include a plurality of pixels each including a plurality of sub-pixels. Two of the pixels may include five of the sub-pixels and temporally share one of the five sub-pixels. 
     The timing controller may include a filter that is set based on a region having the same area as four sub-pixels. The timing controller may generate RGBW data having red, green, blue, and white data based on input data, and may apply the filter to the RGBW data to generate output data corresponding to each of the sub-pixels. 
     The gate driver may provide gate signals to the sub-pixels. 
     The data driver may provide data voltages corresponding to the output data to the sub-pixels. 
     In some embodiments, the sub-pixels may be repeatedly arranged in units of a sub-pixel group including 8 sub-pixels arranged in a 2×4 or 4×2 matrix, and the sub-pixel group may include two red sub-pixels, two green sub-pixels, two blue sub-pixels, and two white sub-pixels. 
     In other embodiments, an aspect ratio of each of the pixels may be substantially 1:1. 
     In still other embodiments, an aspect ratio of each of the sub-pixels may be substantially 1:2.5. 
     In even other embodiments, sub-pixels arranged in a 2×5 matrix form a square-like shape. 
     In yet other embodiments, the timing controller may include a gamma correction unit, a gamut mapping unit, a data determination unit, a sub-pixel rendering unit, and a reverse gamma correction unit. 
     The gamma correction unit may linearize the input data. The gamut mapping unit may map the linearized input data to red, green, blue, and white color gamuts to generate the RGBW data. The saturation data determination unit may analyze the RGBW data for each piece of unit pixel data corresponding to each of the pixels and generate a saturation signal having information whether to have saturated color data. The sub-pixel rendering unit may perform a rendering operation on the RGBW data to generate rendering data corresponding to each of the sub-pixels. The reverse gamma correction unit may non-linearize the rendering data. 
     The filter may include a re-sampling filter and a box filter. The re-sampling filter  2151  may generate sub-pixel rendering data corresponding to a target pixel based on data corresponding to the target pixel and data corresponding to pixels adjacent to the target pixel among the RGBW data. The box filter may compensate for a dot pattern or diagonal pattern including the red, green, or blue color of the RGBW data. 
     In further embodiments, the sub-pixel rendering unit may include a meta-sharp filter, a self-sharpening filter, a pattern detection filter, and a saturated color detection filter. 
     The meta-sharp filter may compensate for distortion by applying the re-sampling filter to the RGBW data. The self-sharpening filter may compensate for distortion by applying the re-sampling filter to a horizontal line pattern or vertical line pattern including a red, green, or blue color of the RGBW data. The pattern detection filter may include a first input terminal and a second input terminal and may analyze the RGBW data and selectively output any one of data received through the first input terminal and data received through the second input terminal according to whether a dot pattern or diagonal pattern is detected. The saturated color detection filter may include a third input terminal and a fourth input terminal and may analyze the saturation signal and selectively output any one of data received through the third input terminal and data received through the fourth input terminal according to whether a saturated color is detected. 
     In still further embodiments, data obtained by adding data obtained by applying the re-sampling filter to the RGBW data and data obtained by applying the self-sharpening filter to the RGBW data may be input to the first input terminal of the pattern detection filter. Data obtained by applying the box filter to the RGBW data may be input to the second input terminal of the pattern detection filter. 
     In even further embodiments, data obtained by adding data obtained by applying the re-sampling filter to the RGBW data and data obtained by applying the meta-sharp filter to the RGBW data may be input to the third input terminal of the saturated color detection filter. Data output from the pattern detection filter may be input to the fourth input terminal of the saturated color detection filter. 
     In yet further embodiments, the re-sampling filter may include first to fifth re-sampling filters. The meta-sharp filter may include first to fifth meta-sharp filter calculated corresponding to the first to fifth re-sampling filters, respectively. The self-sharpening filter may include first to fifth self-sharp filters calculated corresponding to the first to fifth re-sampling filters, respectively. The box filter may include first to fifth box filters. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the inventive concept, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the inventive concept and, together with the description, serve to explain principles of the inventive concept. In the drawings: 
         FIG. 1  is a schematic block diagram illustrating a display apparatus according to an embodiment of the inventive concept; 
         FIG. 2  is a view illustrating a portion of a display panel of  FIG. 1  according to an embodiment of the inventive concept; 
         FIG. 3  is an enlarged view illustrating a first pixel of  FIG. 2  and surroundings thereof; 
         FIG. 4  is an enlarged view illustrating one sub-pixel (red sub-pixel) and surroundings thereof; 
         FIG. 5  is a block diagram illustrating a timing controller of  FIG. 1 ; 
         FIG. 6  is a block diagram illustrating a sub-pixel rendering unit of  FIG. 5 ; 
         FIG. 7  is a view illustrating a re-sampling area in a display panel; 
         FIG. 8  is a view illustrating proportions of the re-sampling area of  FIG. 7  that are occupied by pixel areas adjacent thereto; 
         FIGS. 9A, 9B, 9C, 9D, and 9E  are views illustrating first to fifth re-sampling filters; 
         FIGS. 10A, 10B, 10C, 10D, and 10E  are views illustrating first to fifth meta-sharp filters; 
         FIGS. 11A, 11B, 11C, 11D, and 11E  are views illustrating first to fifth self-sharp filters; 
         FIG. 12  is a view illustrating a process of deriving box filters; 
         FIGS. 13A, 13B, 13C, 13D, and 13E  are views illustrating first to fifth box filters; 
         FIG. 14  is a view illustrating a portion of a display panel of  FIG. 1  according to another embodiment of the inventive concept; and 
         FIG. 15  is a view illustrating a portion of a display panel of  FIG. 1  according to still another embodiment of the inventive concept. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     While embodiments of the inventive concept may be embodied in various modifications and alternative forms, specific embodiments thereof will be described herein in detail and shown by way of example. It should be understood, however, that it is not intended to limit the inventive concept to the particular forms disclosed, but, on the contrary, the inventive concept is to cover all modifications and alternatives falling within the spirit and scope of the inventive concept. 
       FIG. 1  is a schematic block diagram illustrating a display apparatus according to an embodiment of the inventive concept. 
     Referring to  FIG. 1 , a display apparatus  1000  according to an embodiment of the inventive concept includes a display panel  100 , a timing controller  200 , a gate driver  300 , and a data driver  400 . 
     The display panel  100  displays an image. Examples of the display panel  100  may include, but are not limited to, a liquid crystal display panel, an organic light emitting display panel, an electrophoretic display panel, and an electrowetting display panel. 
     When the display panel  100  is the organic light emitting display panel, which is a self-emitting display panel, a backlight unit that provides light to the display panel  100  is not required. On the contrary, when the display panel  100  is the liquid crystal display panel, which is a non-emitting display panel, the display apparatus  1000  may further include a backlight unit (not shown) for providing light to the display panel  100 . 
     The display panel  100  may include a plurality of gate lines GL 1  to GLk that extend in a first direction DR 1 , and a plurality of data lines DL 1  to DLm that extend in a second direction DR 2  intersecting with the first direction DR 1 . 
     The display panel  100  includes a plurality of sub-pixels SP. The sub-pixels SP may be connected to the respective gate lines GL 1  to GLk and the respective data lines DL 1  to DLm.  FIG. 1  illustrates, as an example, a sub-pixel SP connected to a first gate line GL 1  and a first data line DL 1 . 
     The display panel  100  may include a plurality of pixels PX_A and PX_B. Each of the plurality of pixels PX_A and PX_B may include x.5 (x is a natural number) sub-pixels. That is, each of the plurality of pixels PX_A and PX_B may have x normal sub-pixels SP_N and have a certain share of one shared sub-pixel SP_S. Two pixels PX_A and PX_B may share one shared sub-pixel SP_S. In an embodiment of the inventive concept, it is described as an example that each of the plurality of pixels PX_A and PX_B includes 2.5 sub-pixels. 
     The timing controller  200  receives input data RGB and a control signal CS from an external graphic control unit (not shown). The input data RGB may be composed of red data, green data, and blue data. The control signal CS may include a vertical synchronization signal, which is a frame identification signal; a horizontal synchronization signal, which is a row synchronization signal; a data enable signal, which is in a high level during a data output period to indicate a zone to which data is input; and a main clock signal. 
     The timing controller  200  generates data corresponding to the sub-pixels SP on the basis of the input data RGB and converts a data format of the generated data according to an interface specification of the data driver  400 . The timing controller  200  outputs the converted output data RGBWf to the data driver  400 . Specifically, the timing controller  200  performs a rendering operation on the basis of the input data RGB to generate data corresponding to the sub-pixels SP. A detailed description thereof will be provided below. 
     The timing controller  200  generates a gate control signal GCS and a data control signal DCS on the basis of the control signal CS. The timing controller  200  outputs the gate control signal GCS to the gate driver  300  and outputs the data control signal DCS to the data driver  400 . 
     The gate control signal GCS is a signal for driving the gate driver  300 , and the data controls signal DCS is a signal for driving the data driver  400 . 
     The gate driver  300  generates a gate signal on the basis of the gate control signal GCS and outputs the generated gate signal to the gate lines GL 1  to GLk. The gate control signal GCS may include a scan start signal for instructing a scan start, at least one clock signal that controls an output period of a gate-on voltage, and an output enable signal for limiting a duration of the gate-on voltage. 
     The data driver  400  generates a grayscale voltage according to the output data RGBWf that is converted based on the data control signal DCS, and outputs the generated grayscale voltage as a data voltage to the data lines DL 1  to DLm. The data control signal DCS may include a horizontal start signal STH for informing that the converted output data RGBWf starts to be transmitted to the data driver  400 , a load signal for instructing to apply a data voltage to the data lines DL 1  to DLm, and an inversion signal (for a liquid crystal display panel) for inverting a polarity of a data voltage with respect to a common voltage. 
     Each of the timing controller  200 , the gate driver  300 , and the data driver  400  is directly installed in the display panel  100  in the form of at least one integrated circuit chip, installed on a flexible printed circuit board to be attached to the display panel  100  in the form of a tape carrier package (TCP), or installed on a separate printed circuit board. On the contrary, at least one of the gate driver  300  and the data driver  400  may be integrated in the display panel  100  together with the gate lines GL 1  to GLk and the data lines DL 1  to DLm. In addition, the timing controller  200 , the gate driver  300 , and the data driver  400  may be integrated as a single chip. 
       FIG. 2  is a view illustrating a portion of a display panel of  FIG. 1  according to an embodiment of the inventive concept. 
     Referring to  FIG. 2 , the display panel  100  may include a plurality of sub-pixels R, G, B, and W. Each of the sub-pixels R, G, B, and W may display one of primary colors. In an embodiment, the primary colors may include red, green, blue, and white. Accordingly, the sub-pixels R, G, B, and W may include a red sub-pixel R, a green sub-pixel G, a blue sub-pixel B, and a white sub-pixel W. However, the inventive concept is not limited thereto, and thus the primary colors may further include various colors, such as yellow, cyan, and magenta. 
     In  FIG. 2 , the sub-pixels R, G, B, and W may be repeatedly arranged in units of a sub-pixel group SPG including 8 sub-pixels that are arranged in a 2×4 matrix. The sub-pixel group SPG may include two red sub-pixels R, two green sub-pixels, two blue sub-pixels B, and two white sub-pixels W. 
     In  FIG. 2 , of the sub-pixel group SPG, sub-pixels in a first row may be arranged in a first direction DR 1  in the order of a red sub-pixel R, a green sub-pixel G, a blue sub-pixel B, and a white sub-pixel W. In addition, of the sub-pixel group SPG, sub-pixels in a second row may be arranged in the first direction DR 1  in the order of a blue sub-pixel B, a white sub-pixel W, a red sub-pixel R, and a green sub-pixel G. However, the inventive concept is not limited thereto, and the color arrangement of the sub-pixels in the sub-pixel group SPG may be changed. 
     The display panel  100  may include pixel groups PG 1  to PG 4 . Each of the pixel groups PG 1  to PG 4  may include two pixels that are adjacent to each other.  FIG. 2  illustrates, as an example, the 4 pixel groups PG 1  to PG 4 . The pixel groups PG 1  to PG 4  may have the same structure, except for color arrangement of sub-pixels. A first pixel group PG 1  will be described below as an example. 
     The first pixel group PG 1  may include a first pixel PX 1  and a second pixel PX 2 , which are adjacent to each other in the first direction DR 1 . In  FIG. 2 , the first pixel PX 1  and the second pixel PX 2  are shown in different hatched patterns. 
     The display panel  100  includes a plurality of pixel areas PA 1  and PA 2 , and pixels PX 1  and PX 2  are disposed in the pixel areas PA 1  and PA 2 , respectively. The pixels PX 1  and PX 2  are shown by different shadings in  FIG. 2 , each including 2.5 pixels to conceptually depict that the center pixel is shared by the adjacent pixels PX 1  and PX 2 . The pixels PX 1  and PX 2  are each a unit element that determines a resolution of the display panel  100 , and the pixel areas PA 1  and PA 2  are areas where respective pixels are disposed. Each of the pixel areas PA 1  and PA 2  is an area that may display three different colors. 
     Each of the pixel areas PA 1  and PA 2  may be set as an area having a ratio of length in a second direction DR 2  to length in a first direction DR 1  of 1:1 (hereinafter, referred to as an aspect ratio). One pixel may include a portion of one sub-pixel according to a shape (aspect ratio) of the set pixel area. According to an embodiment of the inventive concept, one independent sub-pixel (as an example, the blue sub-pixel B of the first pixel group PG 1 ) is not included in one pixel, and a portion of one independent sub-pixel (as an example, the blue sub-pixel B of the first pixel group PG 1 ) may be included in one pixel. 
     The first pixel PX 1  is disposed in the first pixel area PA 1 , and the second pixel PX 2  is disposed in the second pixel area PA 2 . In  FIG. 2 , the first pixel area PA 1  and the second pixel area PA 2  are shown by different shadings. The first pixel area PA 1  is the area that is occupied by the first pixel PX 1 , and the second pixel area PA 2  is the area that is occupied by the second pixel PX 2 . 
     Five sub-pixels R, G, B, W, and R may be disposed in the first pixel area PA 1  and the second pixel area PA 2 . 
     Each of the sub-pixels R, G, B, W, and R may be included in any one pixel group PG 1  among the pixel groups PG 1  to PG 4 . That is, the pixel Groups PG 1  to PG 4  include mutually exclusive sub-pixels of sub-pixels R, G, B, W, and R. 
     A third sub-pixel (B; hereinafter referred to as a shared sub-pixel) in the first direction DR 1  among the sub-pixels R, G, B, W, and R may overlap the first pixel area PA 1  and the second pixel area PA 2 . PA 1  is the area occupied by PX 1 . That is, the shared sub-pixel B may be disposed at the center of the sub-pixels R, G, B, W, and R included in the first pixel PX 1  and the second PX 2 , and may be part of both the first pixel area PA 1  and the second pixel area PA 2 . 
     The first pixel PX 1  and the second pixel PX 2  may share the shared sub-pixel B. The first pixel PX 1  and the second pixel PX 1  “sharing” the shared sub-pixel B means that blue data applied to the shared sub-pixel B is data generated based on first blue data corresponding to the first pixel PX 1  among the input data RGB and second blue data corresponding to the second pixel PX 2  among the input data RGB. 
     Likewise, two pixel areas included in each of the second to fourth pixel groups PG 2  to PG 4  may share one shared sub-pixel. A shared sub-pixel of the first pixel group PG 1  may be a blue sub-pixel B, a shared sub-pixel of the second pixel group PG 2  may be a white sub-pixel W, a shared sub-pixel of the third pixel group PG 3  may be a red sub-pixel R, and a shared sub-pixel of the fourth pixel group PG 4  may be a green sub-pixel G as the shared sub-pixel is usually in the center of the group. 
     That is, the display panel  100  includes the pixel groups PG 1  to PG 4 , each of which includes two adjacent pixels PX 1  and PX 2 , and the two pixels (e.g., PX 1  and PX 2 ) of each pixel group PG 1  to PG 4  may share a sub-pixel (e.g., B). 
     The first pixel PX 1  and the second pixel PX 2  may be driven during the same horizontal scan period. The horizontal scan period may be defined as a pulse-on period of one gate signal. That is, the first pixel PX 1  and the second pixel PX 2  may be connected to the same gate line and driven by the same gate signal. Likewise, the first pixel group PG 1  and the second pixel group PG 2  may be driven during the same first horizontal scan period, and the third pixel group PG 3  and the fourth pixel group PG 4  may be driven during the same second scan horizontal scan period. 
     In an embodiment of the inventive concept, each of the first pixel PX 1  and the second pixel PX 2  may include 2.5 sub-pixels. Specifically, the first pixel PX 1  may include the red sub-pixel R, the green sub-pixel G, and one half share of the blue sub-pixel B in the first direction DR 1 . The second pixel PX 2  may include the other half share of the blue sub pixel B, the white sub-pixel W, and the red sub-pixel R in the first direction DR 1 . 
     As mentioned above, however, this “sharing” of the center sub pixel is temporal, not physical. While  FIG. 2  depicts the shared subpixel as being divided into half, this does not mean that a blue signal for the first pixel PX 1  only activates half of the shared sub-pixel. In an embodiment of the inventive concept, sub-pixels included in each of the first pixel PX 1  and the second pixel PX 2  may display three different colors. The first pixel PX 1  may display red, green, and blue, and the second pixel PX 2  may display blue, white, and red. However, only one of the first pixel PX 1  and the second pixel PX 2  can activate the blue shared sub-pixel at a time. 
     In an embodiment of the inventive concept, the number of sub-pixels is 2.5 times the number of pixels. For example, the two pixels PX 1  and PX 2  may include five sub-pixels R, G, B, W, and R. In other words, the five sub-pixels R, G, B, W, and R may be disposed in the first pixel area PA 1  and the second pixel area PA 2  where two pixels, that is, the first pixel PX 1  and the second pixel PX 2  are disposed. 
       FIG. 3  is an enlarged view illustrating a first pixel PX 1  of  FIG. 2  and its surroundings.  FIG. 3  illustrates data lines DLj to DLj+3 (1≤j&lt;m) that are adjacent in a first direction DR 1  and gate lines GLi and GLi+1 (1≤j&lt;k) that are adjacent in a second direction DR 2 . In  FIG. 3 , each of areas partitioned by the data lines DLj to DLj+3 (1≤j&lt;m) and the gate lines GLi and GLi+1 (1≤j&lt;k) may include a thin-film transistor and an electrode connected with the thin-film transistor, which are not shown herein. 
     Referring to  FIGS. 2 and 3 , an aspect ratio (a length W 1  in the first direction DR 1  versus a length W 3  in the second direction DR 2 ) of each of the first pixel PX 1  and the second pixel PX 2  may be substantially 1:1. The term “substantially” used herein means within a 5% variation, e.g., due to an error in a process. Since the pixels PX 1  and PX 2  have the same shape, the first pixel PX 1  will be described below as an example. 
     The length W 1  of the first pixel PX 1  in the first direction DR 1  may be defined to be 2.5 times the distance W 2  between a middle of a width of a jth data line DLj in the first direction DR 1  and a middle of a width of a (j+1)th data line DLj+1 in the first direction DR 1 . In other words, the length W 1  of the first pixel PX 1  in the first direction DR 1  may be a sum of a distance between the middle of the width of the jth data line DLj in the first direction DR 1  and a middle of a width of a (j+2)th data line DLj+2 in the first direction DR 1  and a half of a distance between the middle of the width of the (j+2)th data line DLj+2 in the first direction DR 1  and a middle of a width of a (j+3)th data line DLj+3 in the first direction DR 1 . However, the inventive concept is not limited thereto, and the length W 1  of the first pixel PX 1  in the first direction DR 1  may be defined as half of a distance between the middle of the width of the jth data line DLj in the first direction DR 1  and a middle of a width of a (j+6)th data line DLj+6 in the first direction DR 1 . 
     A length W 3  of the first pixel PX 1  in the second direction DR 2  may be defined as a distance between a middle of a width of an ith gate line GLi in the second direction DR 2  and a middle of a width of an (i+1)th gate line GLi+1 in the second direction DR 2 . However, the inventive concept is not limited thereto, and the length W 3  of the first pixel PX 1  in the second direction DR 2  may be defined as a half of a distance between the middle of the width of the ith gate line GLi in the second direction DR 2  and a middle of a width of an (i+2)th gate line in the second direction DR 2 . 
       FIG. 4  is an enlarged view illustrating one sub-pixel (red sub-pixel) and its surroundings.  FIG. 4  illustrates data lines DLj and DLj+1 (1≤j&lt;m) that are adjacent in the first direction DR 1  and gate lines GLi and GLi+1 (1≤j&lt;k) that are adjacent in the second direction DR 2 . In  FIG. 4 , an area partitioned by the data lines DLj and DLj+1 (1≤j&lt;m) and the gate lines GLi and GLi+1 (1≤j&lt;k) may include a thin-film transistor and an electrode connected with the thin-film transistor, which are not shown herein. 
     Referring to  FIGS. 2 and 4 , an aspect ratio (a length W 4  in the first direction DR 1  versus a length W 5  in the second direction DR 2 ) of each of sub-pixels R, G, B, and W may be substantially 1:2.5. The term “substantially,” as used herein, means within a 5% variation due to an error in a process. Since the sub-pixels R, G, B, and W have the same shape, a red sub-pixel R will be described below as an example. 
     A length W 4  of the red sub-pixel R in the first direction DR 1  may be defined as a distance W 4  between the middle of the width of the jth data line DLj in the first direction DR 1  and the middle of the width of the (j+1)th data line DLj+1 in the first direction DR 1 . However, the inventive concept is not limited thereto, and the length W 4  of the red sub-pixel R in the first direction DR 1  may be defined as a half of a distance between the middle of the width of the jth data line DLj in the first direction DR 1  and a middle of a width of a (j+2)th data line in the first direction DR 1 . 
     A length W 5  of the red sub-pixel R in the second direction DR 2  may be defined as a distance between a middle of a width of an ith gate line GLi in the second direction DR 2  and a middle of a width of an (i+1)th gate line GLi+1 in the second direction DR 2 . However, the inventive concept is not limited thereto, and the length W 5  of the red sub-pixel R in the second direction DR 2  may be defined as half of a distance between the middle of the width of the ith gate line GLi in the second direction DR 2  and a middle of a width of an (i+2)th gate line in the second direction DR 2 . 
     Referring again to  FIGS. 2 to 4 , sub-pixels that are arranged in a 2×5 matrix may substantially form a square. That is, each set of the sub-pixels included in the first pixel group PG 1  and the third pixel group PG 3  may substantially form a square. 
     In addition, an aspect ratio of each of the pixel groups PG 1  to PG 4  may be 2:1. When the first pixel group PG 1  is described as an example, the first pixel group PG 1  may include five sub-pixels R, G, B, W, and R. An aspect ratio of each of the sub-pixels R, G, B, W, and R included in the first pixel group PG 1  may be substantially 2:n. In an embodiment of  FIG. 2 , since n is 5, the aspect of the sub-pixels R, G, B, W, and R may be 1:2.5. 
     With the display apparatus according to an embodiment of the inventive concept, the number of data lines may be reduced to ⅚ of the number of data lines of an RGB-stripe structure while representing the same resolution as the RGB-stripe structure because one pixel includes 2.5 sub-pixels. As the number of data lines decreases, a configuration of the data driver ( 400  of  FIG. 1 ) may be simplified, thereby saving a production cost of the data driver ( 400  of  FIG. 1 ). In addition, as the number of data lines decreases, an aperture ratio may also increase. 
     With the display apparatus according to an embodiment of the inventive concept, since one pixel may display three colors, the pixel may have a higher color reproduction even when the pixel has the same resolution as a structure including two of the sub-pixels R, G, B, and W. 
       FIG. 5  is a block diagram illustrating a timing controller of  FIG. 1 . 
     Referring to  FIG. 5 , the timing controller  200  includes a gamma correction unit  211 , a gamut mapping unit  213 , a sub-pixel rendering unit  215 , a reverse gamma correction unit  217 , and a saturation data determination unit  219 . 
     The gamma correction unit  211  receives input data RGB having red data, green data, and blue data. In general, the input data RGB has a nonlinear property. The gamma correction unit  211  applies a gamma function to the input data RGB having the nonlinear property to linearize the input data RGB. The gamma correction unit  211  generates the linearized input data RGB′ based on the input data RGB having the nonlinear property in order to allow subsequent blocks (the gamut mapping unit and the sub-pixel rendering unit) to easily process data. The linearized input data RGB′ is provided to the gamut mapping unit  213 . 
     The gamut mapping unit  213  may generate the RGBW data RGBW having red, green, blue, and white data based on the linearized input data RGB′. The gamut mapping unit  213  may generate the RGBW data RGBW by using a gamut mapping algorithm (GMA) to map an RGB gamut of the linearized input data RGB′ to an RGBW gamut. The RGBW data RGBW may be provided to the sub-pixel rendering unit  215 . The gamut mapping unit  213  may further generate luminance data of the linearized input data RGB′ other than the RGBW data RGBW. The luminance data may be used to determine luminance of a backlight unit (not shown). 
     The sub-pixel rendering unit  215  performs a rendering operation on the RGBW data RGBW to generate rendering data RGBW 2  corresponding to each of the sub-pixels R, G, B, and W. The RGBW data RGBW has data regarding four colors composed of red, green, blue, and white corresponding to respective pixel areas. However, in an embodiment of the inventive concept, one pixel has 2.5 sub-pixels (including the shared sub-pixel) that display three different colors, and thus the rendering data RGBW 2  may have data regarding three of red, green, blue, and white corresponding to respective pixels. The sub-pixel rendering unit  215  will be described below in detail. 
     The rendering data RGBW 2  is provided to a reverse gamma correction unit  217 . The reverse gamma correction unit  217  performs reverse gamma correction on the rendering data RGBW 2  to convert the rendering data RGBW 2  into a non-linearized RGBW data RGBW′ prior to gamma correction. A data format of the non-linearized RGBW data RGBW′ is converted appropriately according to a specification of the data driver  400  and is then provided to the data driver  400  as output data RGBWf. 
     The saturation data determination unit  219  receives the RGBW data RGBW from the gamut mapping unit  213 , and analyzes the RGBW data RGBW for each piece of unit pixel data corresponding to each pixel to thereby generate a saturation signal STR having information regarding whether to have saturated color data. The saturation data determination unit  219  determines that the unit pixel data includes saturated color data when red data, green data, or blue data included in the unit pixel data corresponding to one pixel has a gray scale value equal to or greater than a preset level. The saturation data determination unit  219  outputs the saturation signal STR to the sub-pixel rendering unit  215 . 
       FIG. 6  is a block diagram illustrating the sub-pixel rendering unit of  FIG. 5 . 
     Referring to  FIG. 6 , the sub-pixel rendering unit  215  includes a re-sampling filter  2151 , a meta-sharp filter  2153 , a self-sharpening filter  2155 , a box filter  2157 , a pattern detection filter  2158 , and a saturated color detection filter  2159 . 
     The re-sampling filter  2151  is a filter for generating data corresponding to a target pixel among the rendering data RGBW 2 , based on data corresponding to a target pixel and surrounding pixels adjacent to the target pixel among the RGBW data RGBW. The target pixel may be defined as one pixel on which calculation or detection is to be performed. A filter coefficient of the re-sampling filter  2151  may be determined in consideration of a structure of the display panel  100  of  FIG. 2  and sizes and positions of sub-pixels. A detailed description thereof will be described below. 
     The meta-sharp filter  2153  is a filter for compensating for distortion by applying the re-sampling filter  2151  to a specific pattern of the RGBW data RGBW. The meta-sharp filter  2153  may perform sharpening process on a pattern composed of a white color and a black color to correct the distortion such that the pattern is substantially the same as before passing the re-sampling filter  2151 . For the data that has passed the meta-sharp filter  2153 , blurring of a white pattern may be alleviated. 
     The self-sharpening filter  2155  is a filter for compensating for distortion by applying the re-sampling filter  2151  to a horizontal line pattern or vertical line pattern including a red, green, or blue color of the RGBW data RGBW. The self-sharpening filter  2155  may perform sharpening process on the horizontal line pattern or vertical line pattern including the red, green, or blue color to produce a pattern that is substantially the same as that before passing the re-sampling filter  2151 . 
     The box filter  2157  is a filter for correcting a dot pattern or diagonal pattern including the red, green, or blue color of the RGBW data RGBW. The box filter  2157  may correct the signal such that the dot pattern or diagonal pattern including the red, green, or blue color may be appropriately represented in the structure of the display panel  100  of  FIG. 2 . 
     The pattern detection filter  2158  includes a first input terminal IT 1  and a second input terminal IT 2 . The pattern detection filter  2158  analyzes the RGBW data RGBW and selectively outputs any one of data received through the first input terminal T 1  and the second input terminal IT 2  according to whether the dot pattern or diagonal pattern is detected. 
     Data obtained by adding the data obtained by applying the re-sampling filter  2151  to the RGBW data RGBW and the data obtained by applying the self-sharp filter  1255  to the RGBW data RGBW is input to the first input terminal IT 1  of the pattern detection filter  2158 . Data obtained by adding the box filter  2157  to the RGBW data RGBW is input to the second input terminal IT 2  of the pattern detection filter  2158 . 
     The pattern detection filter  2158  outputs data corresponding to the target pixel input to the second input terminal (IT 2 ) when data corresponding to the target pixel among the RGBW data RGBW has a dot pattern or diagonal pattern. The pattern detection filter  2158  outputs data corresponding to the target pixel input to the first input terminal (IT 1 ) when the RGBW data RGBW corresponding to the target pixel does not have a dot pattern or diagonal pattern. 
     The saturated color detection filter  2159  includes a third input terminal IT 3  and a fourth input terminal IT 4 . The saturated color detection filter  2159  analyzes the saturation signal STR and selectively outputs any one of data received through the third input terminal IT 3  and the fourth input terminal IT 4  according to whether a saturated color is detected. 
     Data, which is obtained by adding the data obtained by applying the re-sampling filter  2151  to the RGBW data RGBW and the data obtained by applying the meta-sharp filter  2153  to the RGBW data RGBW is input to the third input terminal IT 3  of the saturated color detection filter  2159 . The data output from the pattern detection filter  2158  is input to the fourth input terminal IT 4  of the saturated color detection filter  2159 . 
     The saturated color detection filter  2159  outputs data input to the fourth input terminal IT 4  when the data corresponding to the target pixel among the RGBW data RGBW has the saturated color. The saturated color detection filter  2159  outputs data input to the third input terminal IT 3  when the data corresponding to the target pixel among the RGBW data RGBW does not have a saturated color. 
     The data output from the saturated color detection filter  2159  is output as the rendering data RGBW 2 . 
       FIG. 7  is a view illustrating a re-sampling area in the display panel  100 , and  FIG. 8  is a view illustrating proportions of the re-sampling area of  FIG. 7  that are occupied by pixel areas adjacent thereto.  FIGS. 7 and 8  illustrate re-sampling areas SA 1  to SA 5  for red and green sub-pixels, and a pixel area PXA occupied by one pixel.  FIG. 7  illustrates that red, green, blue, and white sub-pixels are indicated using different hatched lines, and illustrates sub-pixels corresponding to the respective hatched lines in a legend. 
     Referring to  FIG. 7 , a re-sampling point (SP) is set between the red sub-pixel and the green sub-pixel. The re-sampling areas SA 1  to SA 5  which are to be covered by the red sub-pixel and the green sub-pixels adjacent thereto are set based on the re-sampling point SP. 
     Each of the re-sampling areas SA 1  to SA 5  may be set to have the same area as the combined area of four sub-pixels. The re-sampling areas SA 1  to SA 5  may be set to have the same area as one another. Each of the re-sampling areas SA 1  to SA 5  may be set to have an approximately rhombic shape. The re-sampling areas SA 1  to SA 5  may include first to fifth re-sampling areas SA 1  to SA 5  according to the position of the re-sampling point SP in the pixel area PA. 
     Referring to  FIG. 8 , it is possible to show proportions of each of the first to fifth re-sampling areas SA 1  to SA 5  that are overlapped by pixel areas adjacent thereto. In  FIG. 8 , each of the first to fifth re-sampling areas SA 1  to SA 5  is indicated as a hatched line. Respective proportions of the first re-sampling area SA 1  that first to nine pixel areas PXA 1  to PXA 9  occupy will be described as an example. The first to ninth pixel regions PXA 1  to PXA 9  overlap or are adjacent to, the first re-sampling area SA 1 , and arranged in the form of a 3×3 matrix. 
     When an area of the first re-sampling area SA 1  is assumed to be 1, each of the second pixel area (PXA 2 ), the fourth pixel area PXA 4 , and the eighth pixel area PXA 8  occupies 0.125 of the first re-sampling area SA 1 . The fifth pixel area PXA 5  occupies 0.5938 of the first re-sampling area SA 1 , and the sixth pixel area PXA 6  occupies 0.0313 of the first re-sampling area SA 1 . 
       FIG. 9A  is a view illustrating a first re-sampling filter RF 1  having filter coefficients that are determined according to the proportions of the first re-sampling area SA 1  that the pixel areas occupy.  FIGS. 9B to 9E  illustrate the second to fifth re-sampling filters RF 2  to RF 5  having filter coefficients that are determined according to the proportions of the second to fifth re-sampling areas SA 2  to SA 5  that the pixel areas occupy, as similar to the first re-sampling filter RF 1 . 
       FIGS. 9A to 9E  illustrate that each of the first to fifth re-sampling filters has filter coefficients, a total sum of which is equal to 256. However, the inventive concept is not limited thereto, and the total sum may vary because the filter coefficients of each of the first to fifth re-sampling filters RF 1  to RF 5  are meaningful as ratios therebetween. For example, the total sum of the coefficients of each of the first to fifth re-sampling filters RF 1  to RF 5  may be equal to 1 or may be greater than 256. 
     The first re-sampling filter RF 1  may have filter coefficients arranged in the form of a 3×3 matrix. In the first re-sampling filter RF 1 , a filter coefficient in first row and first column may be 0, a filter coefficient in first row and second column may be 32, a filter coefficient in first row and third column may be 0, a filter coefficient in second row and first column may be 32, a filter coefficient in second row and second column may be 152, a filter coefficient in second row and third column may be 8, a filter coefficient in third row and first column may be 0, a filter coefficient in third row and second column may be 32, and a filter coefficient in third row and third column may be 0. 
     The second re-sampling filter RF 2  may have filter coefficients arranged in the form of a 3×2 matrix. In the second re-sampling filter RF 2 , a filter coefficient in first row and first column may be 16, a filter coefficient in first row and second column may be 16, a filter coefficient in second row and first column may be 96, a filter coefficient in second row and second column may be 96, a filter coefficient in third row and first column may be 16, and a filter coefficient in third row and second column may be 16. 
     The third re-sampling filter RF 3  may have filter coefficients arranged in the form of a 3×3 matrix. In the third re-sampling filter RF 3 , a filter coefficient in first row and first column may be 0, a filter coefficient in first row and second column may be 32, a filter coefficient in first row and third column may be 0, a filter coefficient in second row and first column may be 8, a filter coefficient in second row and second column may be 152, a filter coefficient in second row and third column may be 32, a filter coefficient in third row and first column may be 0, a filter coefficient in third row and second column may be 32, and a filter coefficient in third row and third column may be 0. 
     The fourth re-sampling filter RF 4  may have filter coefficients arranged in the form of a 3×2 matrix. In the fourth re-sampling filter RF 4 , a filter coefficient in first row and first column may be 4, a filter coefficient in first row and second column may be 28, a filter coefficient in second row and first column may be 64, a filter coefficient in second row and second column may be 128, a filter coefficient in third row and first column may be 4, and a filter coefficient in third row and second column may be 28. 
     The fifth re-sampling filter RF 5  may have filter coefficients arranged in the form of a 3×2 matrix. In the fifth re-sampling filter RF 5 , a filter coefficient in first row and first column may be 28, a filter coefficient in first row and second column may be 4, a filter coefficient in second row and first column may be 128, a filter coefficient in second row and second column may be 64, a filter coefficient in third row and first column may be 28, and a filter coefficient in third row and second column may be 4. 
     The first to fifth re-sampling filters RF 1  to RF 5  illustrated in  FIGS. 9A to 9E  are filters that are derived when a re-sampling point SP is set between the red sub-pixel and the green sub-pixel. Although not illustrated in  FIGS. 7 and 8 , filters derived when the re-sampling point SP is set between the blue sub-pixel and the white sub-pixel are the same as the first to fifth re-sampling filters RF 1  to RF 5  illustrated in  FIGS. 9A to 9E , except for the order of derivation. 
     The fourth re-sampling filter RF 4  of  FIG. 9D  is derived from a re-sampling area of a blue sub-pixel and a white sub-pixel that is to be set between the first re-sampling area SA 1  and the second re-sampling area SA 2 . The fifth re-sampling filter RF 5  of  FIG. 9E  is derived from a re-sampling area of a blue sub-pixel and a white sub-pixel that is to be set between the second re-sampling area SA 2  and the third re-sampling area SA 3 . The first re-sampling filter RF 1  of  FIG. 9A  is derived from a re-sampling area of a blue sub-pixel and a white sub-pixel that is to be set between the third re-sampling area SA 3  and the fourth re-sampling area SA 4 . The second re-sampling filter RF 2  of  FIG. 9B  is derived from a re-sampling area of a blue sub-pixel and a white sub-pixel that is to be set between the fourth re-sampling area SA 4  and the fifth re-sampling area SA 5 . The third re-sampling filter RF 3  of  FIG. 9C  is derived from a re-sampling area of a blue sub-pixel and a white sub-pixel that is to be set between the fifth re-sampling area SA 5  and the sixth re-sampling area SA 6  (not shown). 
       FIGS. 10A to 10E  are views illustrating first to fifth meta-sharp filters MF 1  to MF 5 . 
     Referring to  FIGS. 6 and 10A to 10E , the meta-sharp filter  1253  may include the first to fifth meta-sharp filters MF 1  to MF 5 . 
       FIGS. 10A to 10E  illustrate that the first to fifth meta-sharp filters MF 1  to MF 5  may each have filter coefficients, a total sum of which is equal to 0. 
     The first to fifth meta-sharp filters MF 1  to MF 5  may have the same matrix as the first to fifth re-sampling filters RF 1  to RF 5  illustrated in  FIGS. 9A to 9E , respectively. 
     In the first meta-sharp filter MF 1 , a filter coefficient in first row and first column may be 0, a filter coefficient in first row and second column may be −32, a filter coefficient in first row and third column may be 0, a filter coefficient in second row and first column may be −32, a filter coefficient in second row and second column may be 104, a filter coefficient in second row and third column may be −8, a filter coefficient in third row and first column may be 0, a filter coefficient in third row and second column may be −32, and a filter coefficient in third row and third column may be 0. 
     In the second meta-sharp filter MF 2 , a filter coefficient in first row and first column may be −16, a filter coefficient in first row and second column may be −16, a filter coefficient in second row and first column may be −32, a filter coefficient in second row and second column may be 96, a filter coefficient in third row and first column may be −16, and a filter coefficient in third row and second column may be −16. 
     In the third meta-sharp filter MF 3 , a filter coefficient in first row and first column may be 0, a filter coefficient in first row and second column may be 32, a filter coefficient in first row and third column may be 0, a filter coefficient in second row and first column may be 8, a filter coefficient in second row and second column may be 152, a filter coefficient in second row and third column may be 32, a filter coefficient in third row and first column may be 0, a filter coefficient in third row and second column may be 32, and a filter coefficient in third row and third column may be 0. 
     In the fourth meta-sharp filter MF 4 , a filter coefficient in first row and first column may be −4, a filter coefficient in first row and second column may be −28, a filter coefficient in second row and first column may be −64, a filter coefficient in second row and second column may be 128, a filter coefficient in third row and first column may be −4, and a filter coefficient in third row and second column may be −28. 
     In the fifth meta-sharp filter MF 5 , a filter coefficient in first row and first column may be −28, a filter coefficient in first row and second column may be −4, a filter coefficient in second row and first column may be 64, a filter coefficient in second row and second column may be 0, a filter coefficient in third row and first column may be −28, and a filter coefficient in third row and second column may be −4. 
     The first to fifth meta-sharp filters MF 1  to MF 5  may be calculated corresponding to the first to fifth re-sampling filters RF 1  to RF 5  illustrated in  FIGS. 9A to 9E , respectively. Data, which is obtained by adding data obtained by applying the first re-sampling filter RF 1  among the RGBW data RGBW and data obtained by applying the first meta-sharp filter MF 1  among the RGBW data RGBW, is input to the third input terminal IT 3  of the saturated color detection filter  2159 . Data, which is obtained by adding data obtained by applying the second re-sampling filter RF 2  among the RGBW data RGBW and data obtained by applying the second meta-sharp filter MF 2  among the RGBW data RGBW, is input to the third input terminal IT 3  of the saturated color detection filter  2159 . Data, which is obtained by adding data obtained by applying the third re-sampling filter RF 3  among the RGBW data RGBW and data obtained by applying the third meta-sharp filter MF 3  among the RGBW data RGBW, is input to the third input terminal IT 3  of the saturated color detection filter  2159 . Data, which is obtained by adding data obtained by applying the fourth re-sampling filter RF 4  among the RGBW data RGBW and data obtained by applying the fourth meta-sharp filter MF 4  among the RGBW data RGBW, is input to the third input terminal IT 3  of the saturated color detection filter  2159 . Data, which is obtained by adding data obtained by applying the fifth re-sampling filter RF 5  among the RGBW data RGBW and data obtained by applying the fifth meta-sharp filter MF 5  among the RGBW data RGBW, is input to the third input terminal IT 3  of the saturated color detection filter  2159 . 
       FIGS. 11A to 11E  are views illustrating first to fifth self-sharpening filters SF 1  to SF 5 . 
     Referring to  FIGS. 6 and 11A to 11E , the self-sharp filter  2155  may include the first to fifth self-sharp filters SF 1  to SF 5 . 
       FIGS. 11A to 11E  show that the first to fifth self-sharp filters SF 1  to SF 5  may each have coefficients, a total sum of which is equal to 0. 
     The first to fifth self-sharpening filters SF 1  to SF 5  may have the same matrix size as the first to fifth re-sampling filters RF 1  to RF 5  shown in  FIGS. 9A to 9E , respectively. 
     In the first self-sharpening filter SF 1 , a filter coefficient in first row and first column may be −16, a filter coefficient in first row and second column may be 0, a filter coefficient in first row and third column may be −16, a filter coefficient in second row and first column may be 0, a filter coefficient in second row and second column may be 40, a filter coefficient in second row and third column may be 24, a filter coefficient in third row and first column may be −16, a filter coefficient in third row and second column may be 0, and a filter coefficient in third row and third column may be −16. 
     In the second self-sharpening filter SF 2 , a filter coefficient in first row and first column may be −16, a filter coefficient in first row and second column may be −16, a filter coefficient in second row and first column may be −32, a filter coefficient in second row and second column may be 96, a filter coefficient in third row and first column may be −16, and a filter coefficient in third row and second column may be −16. 
     In the third self-sharpening filter SF 3 , a filter coefficient in first row and first column may be −20, a filter coefficient in first row and second column may be −12, a filter coefficient in first row and third column may be 0, a filter coefficient in second row and first column may be 32, a filter coefficient in second row and second column may be 0, a filter coefficient in second row and third column may be 32, a filter coefficient in third row and first column may be −20, a filter coefficient in third row and second column may be −12, and a filter coefficient in third row and third column may be 0. 
     In the fourth self-sharpening filter SF 4 , a filter coefficient in first row and first column may be −36, a filter coefficient in first row and second column may be −4, a filter coefficient in second row and first column may be 0, a filter coefficient in second row and second column may be 128, a filter coefficient in third row and first column may be −36, and a filter coefficient in third row and second column may be −4. 
     In the fifth self-sharpening filter SF 5 , a filter coefficient in first row and first column may be −28, a filter coefficient in first row and second column may be −4, a filter coefficient in second row and first column may be 0, a filter coefficient in second row and second column may be 64, a filter coefficient in third row and first column may be −28, and a filter coefficient in third row and second column may be −4. 
     The first to fifth self-sharpening filters SF 1  to SF 5  may be calculated corresponding to the first to fifth re-sampling filters RF 1  to RF 5  shown in  FIGS. 9A to 9E , respectively. Data, which is obtained by adding data obtained by applying the first re-sampling filter RF 1  among the RGBW data RGBW and data obtained by applying the first self-sharpening filter SF 1  among the RGBW data RGBW, is input to the first input terminal IT 1  of the pattern detection filter  2158 . Data, which is obtained by adding data obtained by applying the second re-sampling filter RF 2  among the RGBW data RGBW and data obtained by applying the second self-sharpening filter SF 2  among the RGBW data RGBW, is input to the first input terminal IT 1  of the pattern detection filter  2158 . Data, which is obtained by adding data obtained by applying the third re-sampling filter RF 3  among the RGBW data RGBW and data obtained by applying the third self-sharp filter SF 3  among the RGBW data RGBW, is input to the first input terminal IT 1  of the pattern detection filter  2158 . Data, which is obtained by adding data obtained by applying the fourth re-sampling filter RF 4  among the RGBW data RGBW and data obtained by applying the fourth self-sharpening filter SF 4  among the RGBW data RGBW, is input to the first input terminal IT 1  of the pattern detection filter  2158 . Data, which is obtained by adding data obtained by applying the fifth re-sampling filter RF 5  among the RGBW data RGBW and data obtained by applying the fifth self-sharpening filter SF 5  among the RGBW data RGBW, is input to the first input terminal IT 1  of the pattern detection filter  2158 . 
       FIG. 12  is a view illustrating a process of deriving box filters. Part (a) of  FIG. 12  illustrates sub-pixels included in 8 pixels, part (b) of  FIG. 12  illustrates box re-sampling areas that are set in 8 pixels, and part (c) of  FIG. 12  illustrates pixels displayed when a box filter is applied in the case where unit pixel data corresponding to each pixel among the RGBW data RGBW represents a red color with the maximum grayscale. 
     First to eight pixels PXL 1  to PXL 8  illustrated in part (a) of  FIG. 12  will be described as a reference. The first to eighth pixels PXL 1  to PXL 8  may be a portion of the display panel  100  of  FIG. 2 . 
     Referring to part (a) and part (b) of  FIG. 12 , a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel that are continuously disposed are set as one box re-sampling area. The box re-sampling area may be set to have the same area as four sub-pixels. The first to fifth box re-sampling areas BA 1  to BA 5  may be set in the first to eighth pixels PXL 1  to PXL 8 . 
     In part (b) of  FIG. 12 , in order to define boundaries among the first to fifth box re-sampling areas BA 1  to BA 5 , adjacent box re-sampling areas among the first to fifth box re-sampling areas BA 1  to BA 5  are differently shaded. 
     In addition, part (b) of  FIG. 12  illustrates proportions of the first to fifth box re-sampling areas BA 1  to BA 5  that are respectively occupied by the first to eighth pixels PXL 1  to PXL 8 . A proportion of the first box re-sampling area BA 1  that the first pixel PXL 1  occupies is 0.625, and a proportion that the first pixel PXL 2  occupies is 0.375. A proportion of the second box re-sampling area BA 2  that the second pixel PXL 2  occupies is 0.25, a proportion that the third pixel PXL 3  occupies is 0.625, and a proportion that the fourth pixel PXL 4  occupies is 0.125. A proportion of the third box re-sampling area BA 3  that the fourth pixel PXL 4  occupies is 0.5, and a proportion that the fifth pixel PXL 5  occupies is 0.5. A proportion of the fourth box re-sampling area BA 4  that the fifth pixel PXL 5  occupies is 0.125, a proportion that the sixth pixel PXL 6  occupies is 0.625, and a proportion that the seventh pixel PXL 7  occupies is 0.25. A proportion of the fifth box re-sampling area BA 5  that the seventh pixel PXL 7  occupies is 0.375, and a proportion that the eighth pixel PXL 8  occupies is 0.625. 
     Referring to (c) of  FIG. 12 , in the case where data corresponding to the first pixel PXL 1  among the RGBW data RGBW has a red color with the maximum grayscale, when the box filter is applied, the red sub-pixel in the first box re-sampling area BA 1  may display 62.5% of the maximum luminance. 
     In the case where data corresponding to the second pixel PXL 2  among the RGBW data RGBW has a red color with the maximum grayscale, when the box filter is applied, the red sub-pixel in the first box re-sampling area BA 1  may display 37.5% of the maximum luminance, and the red sub-pixel in the second box re-sampling area BA 2  may display 25% of the maximum luminance. 
     In the case where data corresponding to the third pixel PXL 3  among the RGBW data RGBW has a red color with the maximum grayscale, when the box filter is applied, the red sub-pixel in the second box re-sampling area BA 2  may display 62.5% of the maximum luminance. 
     In the case where data corresponding to the fourth pixel PXL 4  among the RGBW data RGBW has a red color with the maximum grayscale, when the box filter is applied, the red sub-pixel in the second box re-sampling area BA 2  may display 12.5% of the maximum luminance, and the red sub-pixel in the third box re-sampling area BA 3  may display 50% of the maximum luminance. 
     In the case where data corresponding to the fifth pixel PXL 5  among the RGBW data RGBW has a red color with the maximum grayscale, when the box filter is applied, the red sub-pixel in the third box re-sampling area BA 3  may display 50% of the maximum luminance, and the red sub-pixel in the fourth box re-sampling area BA 4  may display 12.5% of the maximum luminance. 
     In the case where data corresponding to the sixth pixel PXL 6  among the RGBW data RGBW has a red color with the maximum grayscale, when the box filter is applied, the red sub-pixel in the fourth box re-sampling area BA 4  may display 62.5% of the maximum luminance. 
     In the case where data corresponding to the seventh pixel PXL 7  among the RGBW data RGBW has a red color with the maximum grayscale, when the box filter is applied, the red sub-pixel in the fourth box re-sampling area BA 4  may display 25% of the maximum luminance, and the red sub-pixel in the fifth box re-sampling area BA 5  may display 37.5% of the maximum luminance. 
     In the case where data corresponding to the eighth pixel PXL 8  among the RGBW data RGBW has a red color with the maximum grayscale, when the box filter is applied, the red sub-pixel in the fifth box re-sampling area BA 5  may display 62.5% of the maximum luminance. 
       FIG. 13A  is a view illustrating a first box filter BF 1  having filter coefficients that are determined according to proportions of the first box re-sampling area BA 1  that pixels occupy.  FIGS. 13B to 13E  are views illustrating second to fifth box filters BF 2  to BF 5  having filter coefficients that are determined according to proportions of the second to fifth block re-sampling areas BA 2  to BA 5  that pixels occupy, as similar to the first box filter BF 1 . 
       FIGS. 13A to 13E  show the first to fifth re-sampling filters each have filter coefficients, a total sum of which is equal to 256. However, the inventive concept is not limited thereto, and the total sum may vary because the filter coefficients of each of the first to fifth box re-sampling filters BF 1  to BF 5  are expressed as proportions of one another. For example, the total sum of the filter coefficients of each of the first to fifth box filters BF 1  to BF 5  may be equal to 1 or may be greater than 256. 
     The first box filter BF 1  may have filter coefficients arranged in the form of a 1×2 matrix. In the first box filter BF 1 , a filter coefficient in first row and first column may be 160, and a filter coefficient in first row and second column may be 96. 
     The second box filter BF 2  may have filter coefficients arranged in the form of a 1×3 matrix. In the second box filter BF 2 , a filter coefficient in first row and first column may be 64, a filter coefficient in first row and second column may be 160, and a filter coefficient in first row and third column may be 32. 
     The third box filter BF 3  may have filter coefficients arranged in the form of a 1×2 matrix. In the third box filter BF 3 , a filter coefficient in first row and first column may be 128, and a filter coefficient in first row and second column may be 128. 
     The fourth box filter BF 4  may have filter coefficients arranged in the form of a 1×3 matrix. In the fourth box filter BF 4 , a filter coefficient in first row and first column may be 32, a filter coefficient in first row and second column may be 160, and a filter coefficient in first row and third column may be 64. 
     The fifth box filter BF 5  may have filter coefficients arranged in the form of a 1×2 matrix. In the fifth box filter BF 5 , a filter coefficient in first row and first column may be 96, and a filter coefficient in first row and second column may be 160. 
       FIG. 14  is a view illustrating a portion of a display panel of  FIG. 1  according to another embodiment of the inventive concept. 
     A display panel  101  shown in  FIG. 14  is substantially similar to the display panel  100  shown in  FIG. 2 , except for color arrangement of sub-pixels. The display panel  101  shown in  FIG. 14  will be described below, focusing on a difference with the display panel  100  shown in  FIG. 2 . 
     In  FIG. 14 , the sub-pixels R, G, B, and W may be repeatedly arranged in units of a sub-pixel group SPG including 10 sub-pixels that are arranged in a 2×5 matrix. The sub-pixel group SPG may include two red sub-pixels, two green sub-pixels, two blue sub-pixels, and four white sub-pixels. 
     Sub-pixels in first row of the sub-pixel group SPG may be arranged in a first direction DR 1  in the order of a red sub-pixel R, a green sub-pixel G, a white sub-pixel W, and a blue sub-pixel B. In addition, sub-pixels in second row of the sub-pixel group SPG may be arranged in a first direction DR 1  in the order of a blue sub-pixel B, at least one white sub-pixel W, a red sub-pixel R, and a green sub-pixel G. However, the inventive concept is not limited thereto, and the color arrangement of the sub-pixels may be variously changed. 
     A sub-pixel shared in a first pixel group PG 1  may display a white color. In addition, a sub-pixel shared in a second pixel group PG 2  may display a white color. That is, a shared sub-pixel in the display panel  101  of  FIG. 14  may be a white sub-pixel that displays the white color. 
     With the display panel  101  shown in  FIG. 14 , it is possible to enhance the luminance level by increasing the number of white sub-pixels, compared to the display panel  100  shown in  FIG. 2 . With the display panel  101  shown in  FIG. 14 , it is also possible to reduce the area that is occupied by a white sub-pixel in each pixel, by sharing the white sub-pixel between two pixels of each pixel group, compared to a structure including two sub-pixels among RGBW sub-pixels of one pixel. Accordingly, this results in reduction of yellow to white ratio (Y/W ratio) due to addition of the white sub-pixel. “Y/W ratio” is a property for describing display quality, wherein “yellow” is a color having worst brightness with white background. 
       FIG. 15  is a view illustrating a portion of a display panel of  FIG. 1  according to still another embodiment of the inventive concept. 
     A display panel  102  shown in  FIG. 15  is substantially similar to the display panel  100  shown in  FIG. 2 , except for color arrangement of sub-pixels. The display panel  102  shown in  FIG. 15  will be described below, focusing on a difference with the display panel  100  shown in  FIG. 2 . 
     In  FIG. 15 , the sub-pixels R, G, B, and W may be repeatedly arranged in units of a sub-pixel group SPG including 10 sub-pixels that are arranged in a 2×5 matrix. The sub-pixel group SPG may include three red sub-pixels, three green sub-pixels, two blue sub-pixels, and two white sub-pixels. 
     Sub-pixels in first row of the sub-pixel group SPG may be arranged in a first direction DR 1  in the order of a red sub-pixel R, a green sub-pixel G, a white sub-pixel W, a blue sub-pixel B, and the red sub-pixel R. In addition, sub-pixels in second row of the sub-pixel group SPG may be arranged in a first direction DR 1  in the order of a green sub-pixel G, a blue sub-pixel B, a white sub-pixel W, a red sub-pixel R, and a green sub-pixel G. However, the inventive concept is not limited thereto, and the color arrangement of the sub-pixels may be variously changed. 
     A sub-pixel shared in a first pixel group PG 1  may display a white color. In addition, a sub-pixel shared in a second pixel group PG 2  may display a white color. That is, a shared sub-pixel in the display panel  102  of  FIG. 15  may be a white sub-pixel that displays the white color. 
     With the display panel  102  shown in  FIG. 15 , it is possible to reduce an area of each pixel that a white sub-pixel occupies by sharing the white sub-pixel by two pixels of each pixel group (thereby putting 2.5 sub-pixels in a pixel area), compared to a structure including two sub-pixels among RGBW sub-pixels of one pixel. Accordingly, this results in reduction of a ratio of yellow to white (Y/W ratio) due to addition of the white sub-pixel. 
     Color recognition resolution of a human eye is green&gt;red&gt;blue&gt;white. With the display panel  102  of  FIG. 15 , it is possible to enhance color recognition resolution of the display apparatus by disposing the red sub-pixels and green sub-pixels more than the blue sub-pixels and white sub-pixels. 
     The display apparatus according to an embodiment of the inventive concept can enhance a transmittance factor and an aperture ratio. The display apparatus may also enhance color reproduction of the display apparatus. 
     Although the embodiments of the inventive concept have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Accordingly, such modifications, additions and substitutions should also be understood to fall within the scope of the inventive concept.