Abstract:
A display apparatus includes a backlight assembly generating a light; a sensor sensing an amount of the light and color coordinates of the light to generate sensing information; a display panel receiving the light and displaying an image in response to a gray-scale voltage; a gray-scale compensation unit receiving M-bit source data and compensating a gray-scale of the source data in response to the sensing information to generate N-bit first compensation data; and a data driver converting the first compensation data into gray-scale voltage and proving the gray-scale voltage to the display panel.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application is based on and claims priority from Korean Patent Application No. 2008-07963 filed on Jan. 25, 2008, the contents of which is incorporated by reference herein. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Technical Field 
         [0003]    The present disclosure relates to a display apparatus and a method of driving the same. More particularly, the present disclosure relates to a display apparatus that is less expensive to manufacture and a method of driving the display apparatus. 
         [0004]    2. Discussion of the Related Art 
         [0005]    A liquid crystal display includes a liquid crystal display panel and a backlight assembly. The liquid crystal display panel includes two display substrates and a liquid crystal layer interposed between the two display substrates, and the backlight assembly provides the liquid crystal display panel with light. 
         [0006]    The liquid crystal display panel applies an electric field to the liquid crystal layer and controls the electric field in order to adjust an amount of light passing through the liquid crystal layer, thereby displaying a desired image. The backlight assembly includes light sources for emitting light and optical sheets arranged above the light sources to diffuse the light. 
         [0007]    As the light sources for the backlight assembly, various light sources that emit white light may be used, such as a cold cathode fluorescent lamp, a flat fluorescent lamp, etc. However, in order to reduce power consumption, a liquid crystal display that employs light emitting diodes (LEDs) as the light sources has been developed. 
         [0008]    The LED emitting the white light includes a blue LED chip and a yellow fluorescent substance, and the light emitted from the blue LED chip is changed to the white light while passing through the yellow fluorescent substance. Since a white LED mixes a color of the light emitted from the blue LED with a color of the fluorescent substance to generate the white light, it is difficult to control color coordinates of the light emitted from the white LED. 
         [0009]    The color coordinates of the white light appropriate to the backlight assembly is limited to a specific range, only a few white LEDs, which have color coordinates of the white light appropriate to the backlight assembly, can be used in the backlight assembly. As a result, the product cost of the white LED increases, thereby increasing the manufacturing cost of the liquid crystal display. 
       SUMMARY OF THE INVENTION 
       [0010]    A display apparatus, according to an exemplary embodiment of the present invention, includes a backlight assembly, a sensor, a display panel, a gray-scale compensation unit, and a data driver. 
         [0011]    The backlight assembly generates a light, and the sensor senses an amount of the light and color coordinates of the light to generate sensing information. The display panel receives the light and displays an image in response to a gray-scale voltage. The gray-scale compensation unit receives M-bit source data and compensates a gray-scale of the source data in response to the sensing information to generate N-bit first compensation data. M is a constant number equal to or larger than 1 and N is a constant number equal to or larger than 1. The data driver converts the first compensation data into the gray-scale voltage to provide the gray-scale voltage to the display panel. 
         [0012]    The gray-scale compensation unit may include a data storing part, a controlling part, a data generating part, and a dithering part. The data storing part stores a plurality of second compensation data generated corresponding to the light amount and the color coordinates of the light emitted from the backlight assembly in each gray-scale of M-bit. The controlling part reads out the second compensation data corresponding to the sensing information and the source data. The data generating part bit-expands the source data using the second compensation data that are read out from the data storing part by the controlling part to output third compensation data. The dithering part bit-contracts the third compensation data and dithers the third compensation data to generate the first compensation data. The second compensation data read-out from the data storing part have difference data values between the source data and the third compensation data, and each of the second compensation data has a number of bits smaller than the third compensation data. 
         [0013]    The gray-scale compensation unit may include a data storing part, a controlling part, and a dithering part. The data storing part stores a plurality of third compensation data generated corresponding to the light amount and the color coordinates of the light emitted from the backlight assembly in each gray-scale of M-bit. The controlling part reads out the third compensation data corresponding to the sensing information and the source data. The dithering part dithers the third compensation data read out by the controlling part from the data storing part to generate the first compensation data. The third compensation data that are read-out from the data storing part are obtained by bit-expanding the source data. 
         [0014]    The backlight assembly may include a plurality of point light sources each of which includes a light emitting diode that emits a white light. 
         [0015]    A method of driving a display apparatus having a display panel that receives a light and displays an image in response to a gray-scale voltage, according to an exemplary embodiment of the present invention, is provided as follows. When color coordinates and a light amount of the light are sensed, sensing information is generated. Then, a gray-scale of M-bit source data is compensated in response to the sensing information to generate N-bit first compensation data. M is a constant number equal to or larger than 1 and N is a constant number equal to or larger than 1. The first compensation data is converted into the gray-scale voltage and the gray-scale voltage is provided to the display panel. 
         [0016]    A display apparatus, according to an exemplary embodiment of the present invention, includes a backlight assembly, a sensor, a display panel, a gray-scale compensation unit, and a data driver. 
         [0017]    The backlight assembly generates a light, and the display panel receives the light and displays an image in response to a gray-scale voltage. The gray-scale compensation unit receives M-bit source data, stores a plurality of second compensation data generated corresponding to a light amount and color coordinates of the light generated by the backlight assembly in each gray-scale of M-bit, and compensates a gray-scale of the source data using the second compensation data to generate first compensation data. The data driver converts the first compensation data into the gray-scale voltage and provides the gray-scale voltage to the display panel. 
         [0018]    A method of driving a display apparatus having a display panel that receives a light and displays an image in response to a gray-scale voltage and a data storing part, according to an exemplary embodiment of the present invention, is provided as follows. When color coordinates and a light amount of the light are sensed, sensing information is generated. Second compensation data generated according to each gray-scale of M-bit is stored in the data storing part in response to the sensing information. When M-bit source data is received, a gray-scale of the source data is compensated using a plurality of pre-stored second compensation data to generate N-bit first compensation data. N is a constant number equal to or larger than 1. The first compensation data is converted into the gray-scale voltage and the gray-scale is provided to the display panel. 
         [0019]    According to the above, the gray-scale compensation unit compensates the source data according to the chromaticity levels of the backlight assembly. Thus, the liquid crystal display may display the image having uniform gray-scale without relation of the chromaticity levels of the backlight assembly, thereby improving the image display quality and reducing the manufacturing cost. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0020]    Exemplary embodiments of the present invention will become readily apparent by reference to the following detailed description when considered in conjunction with the accompanying drawings, wherein: 
           [0021]      FIG. 1  is a block diagram showing a liquid crystal display according to an exemplary embodiment of the present invention; 
           [0022]      FIG. 2  is a sectional view showing a liquid crystal display panel and a backlight assembly of  FIG. 1 ; 
           [0023]      FIG. 3  is a schematic view showing a data storing part of  FIG. 1 ; 
           [0024]      FIG. 4  is a flowchart illustrating a driving method of the liquid crystal display of  FIG. 1 ; 
           [0025]      FIG. 5  is a flowchart illustrating a data read-out process of second compensation data of  FIG. 3 ; 
           [0026]      FIG. 6  is a block diagram showing a liquid crystal display according to an exemplary embodiment of the present invention; 
           [0027]      FIG. 7  is a flowchart illustrating a driving method of the liquid crystal display of  FIG. 6 ; 
           [0028]      FIG. 8  is a flowchart illustrating a data read-out process of third compensation data of  FIG. 7 ; 
           [0029]      FIG. 9  is a block diagram showing a liquid crystal display according to an exemplary embodiment of the present invention; and 
           [0030]      FIG. 10  is a flowchart illustrating a driving method of the liquid crystal display of  FIG. 9 . 
       
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0031]    It will be understood that when an element or layer is referred to as being “on”, “connected to” or “coupled to” another element or layer, it can be directly on, connected or coupled to the other element or layer or intervening elements or layers may be present. Like numbers refer to like elements throughout. 
         [0032]    Hereinafter, exemplary embodiments of the present invention will be explained in detail with reference to the accompanying drawings. 
         [0033]    Referring to  FIGS. 1 and 2 , a liquid crystal display  601  includes a backlight assembly  100 , a liquid crystal display panel  200 , a data driver  310 , a gate driver  320 , a sensor  400 , and a gray-scale compensation unit  501 . 
         [0034]    The backlight assembly  100  is disposed under the liquid crystal display panel  200  and generates light  10 . The backlight assembly  100  includes a plurality of point light sources  110  and a plurality of optical sheets  120 . 
         [0035]    Each point light source  111  includes a white light emitting diode (LED). The optical sheets  120  are arranged between the point light sources  110  and the liquid crystal display panel  200  to improve optical characteristics (i.e., brightness) of the light  10  emitted from the point light sources  111 . 
         [0036]    The liquid crystal display panel  200  includes an array substrate  210 , a color filter substrate  220  facing the array substrate  210 , and a liquid crystal layer  230  interposed between the array substrate  210  and the color filter substrate  220 . 
         [0037]    Particularly, the array substrate  210  includes first to j-th gate lines GL 1 ˜GLnj, first to k-th data line DL 1 ˜DLk, and a plurality of pixels. 
         [0038]    The first to j-th gate lines GL 1 ˜GLj are extended in a predetermined direction and spaced apart from each other. The first to j-th gate lines GL 1 ˜GLj are electrically connected to the gate driver  320  and transmit gate signals sequentially output from the gate driver  320 . 
         [0039]    The first to k-th data lines DL 1 ˜DLk are insulated from and intersected with the first to j-th gate lines GL 1 ˜GLj in order to define pixels. The first to k-th data lines DL 1 ˜DLk are electrically connected to the data driver  310  and transmit data signals (for example gray-scale voltages) output from the data driver  310 . 
         [0040]    The pixels are turned on in response to the gate signal applied through a corresponding gate line of the gate lines GL 1 ˜GLj. Each of the pixels includes a thin film transistor (TFT) and a liquid crystal capacitor. As an example of a representative pixel, a first pixel  212  includes a first thin film transistor  211  and a first liquid crystal capacitor Clc. The first thin film transistor  211  includes a gate electrode connected to the first gate line GL 1 , a source electrode connected to the first data line DL 1 , and a drain electrode connected to a first terminal of the liquid crystal capacitor Clc. The liquid crystal capacitor Clc further includes a second terminal to which a common voltage Vcom is applied. 
         [0041]    The color filter substrate  220  is arranged above the array substrate  210 . The color filter substrate  220  displays colors respectively corresponding to the pixels by using the light passing through the liquid crystal layer  230  and emitting from the backlight assembly  100 . Gray-scales of the colors displayed through the pixels are determined by the gray-scale voltages. 
         [0042]    The data driver  310  is arranged adjacent to one of the ends of the first to k-th data lines DL 1 ˜DLk, and the gate driver  320  is arranged adjacent to one of the ends of the first to j-th gate lines GL 1 ˜GLj. The data driver  310  outputs the gray-scale voltages to the first to k-th data lines DL 1 ˜DLk in response to data control signals applied from the gray-scale compensation unit  501 . The data driver  310  may be mounted on the array substrate  210  or may be separated from the array substrate  210 . 
         [0043]    The gate driver  320  sequentially outputs the gate signals to the first to j-th gate lines GL 1 ˜GLj in response to gate control signals applied from the gray-scale compensation unit  501 . The gate driver  320  may be also mounted on the array substrate  210 , or may be separated from the array substrate  210 . 
         [0044]    The sensor  400  senses the amount of the light  10  emitted from the backlight assembly  100  and the color coordinates of the light  10  and generates sensing information SI. The color coordinates may be determined by the white LED  111 . The sensor  400  is electrically connected to the gray-scale compensation unit  501  to provide the sensing information SI to the gray-scale compensation unit  501 . 
         [0045]    The gray-scale compensation unit  501  receives M-bit source data SD (M is a constant number equal to or larger than 1) corresponding to the image, and the source data SD has a gray-scale value corresponding to one of red, green, and blue colors. The gray-scale compensation unit  501  compensates the gray-scale level of the source data SD in response to the sensing information SI to generate first compensation data GCD 1 . As an example of the present invention, the gray-scale compensation unit  501  compensates the gray-scale level of the source data SD by using an adaptive color correction (ACC) technique. 
         [0046]    The gray-scale compensation unit  501  provides the first compensation data GCD 1  to the data driver  310 , and the data driver  310  changes the first compensation data GCD 1  to the gray-scale voltages and provides the gray-scale voltages to the liquid crystal display panel  200 . 
         [0047]    The gray-scale compensation unit  501  includes a data storing part  510 , a controlling part  520 , a data generating part  530 , and a dithering part  540 . 
         [0048]    The data storing part  510  stores second compensation data GCD 2  generated corresponding to the amount of light  10  emitted from the backlight assembly  100  and the color coordinates of the light  10  in each gray-scale of M-bit. 
         [0049]    The second compensation data GCD 2  are generated corresponding to each of the red, green and blue colors in each gray-scale of M-bit, and the second compensation data GCD 2  have a difference data value between the source data SD and a third compensation data GCD 3  obtained by bit-expanding the source data SD. Each of the second compensation data GCD 2  has a number of bits smaller than the third compensation data GCD 3 , thereby reducing the whole size of the data storing part  510 . 
         [0050]    Also, since the second compensation data GCD 2  are generated corresponding to each of the red, green and blue colors in each gray-scale of M-bit, the gray-scale compensation unit  501  may control the gray-scale voltages according to a color chromaticity of the light  10  provided to the liquid crystal display panel  200 . 
         [0051]    That is, the color chromaticity of the light  10  emitted from the white LED  111  is determined by the light amount and the color coordinates of the backlight assembly  100 . The second compensation data GCD 2  are generated corresponding to chromaticity levels in each gray-scale of M-bit after dividing color chromaticity range of the light  10  emitted from the backlight assembly  100 . Accordingly, although the second compensation data GCD 2  correspond to the same gray-scale, the second compensation data GCD 2  may have different values from each other according to the color chromaticity range of the light  10 . Hereinafter, the divided color chromaticity range of the light  10  will be referred to as the chromaticity levels. 
         [0052]    Referring to  FIGS. 1 and 3 , the data storing part  510  includes first to p-th look-up tables  511 - 1 ˜ 511 - p  to store the second compensation data GCD 2 . The first to p-th look-up tables  511 - 1 ˜ 511 - p  are generated corresponding to the chromaticity levels in one-to-one fashion, and the number of the look-up tables  511 - 1 ˜ 511 - p  are the same as the chromaticity levels. 
         [0053]    Each of the second compensation data GCD 2  is stored in a corresponding look-up table, which has the same chromaticity level, of the look-up tables  511 - 1 ˜ 511 - p.  The second compensation data GCD 2  stored in the look-up table  511 - 1 ˜ 511 - p  are stored corresponding to the red, green and blue colors in each gray-scale of M-bit. 
         [0054]    The second compensation data GCD 2  stored in the first to p-th look-up tables  511 - 1 ˜ 511 - p  are read out by the controlling part  520 . The controlling part  520  receives the source data SD and the sensing information SI and reads out the second compensation data GCD 2  corresponding to the sensing information SI and the source data SD from the data storing part  510 . 
         [0055]    Particularly, the controlling part  520  selects a chromaticity level corresponding to the sensing information SI and selects a look-up table of the first to p-th look-up tables  511 - 1 ˜ 511 - p , corresponding to the selected chromaticity level. The controlling part  520  reads out the second compensation data GCD 2  corresponding to the gray-scale and the color of the source data SD from the selected look-up table and provides the read-out second compensation data GCD 2  to the data generating part  530 . 
         [0056]    Also, the controlling part  520  applies the data control signal DCS and the gate control signal GCS to the data driver  310  and the gate driver  320  in response to the source data SD, respectively. 
         [0057]    The data generating part  530  generates the third compensation data GCD 3  using the second compensation data GCD 2  that are read out from the data storing part  510  and the source data SD, and the data generating part  530  provides the third compensation data GCD 3  to the dithering part  540 . 
         [0058]    The dithering part  540  contracts the number of bits of the third compensation data GCD 3  considering the data bits of the data driver  310  and dithers the third compensation data GCD 3  to generate the first compensation data GCD 1 . The dithering part  540  provides the first compensation data GCD 1  to the data driver  310 , and the data driver  310  converts the first compensation data GCD 1  into the gray-scale voltages. 
         [0059]    As described above, the gray-scale compensation unit  501  compensates the source data SD according to the chromaticity levels of the light  10  generated by the backlight assembly  100 . Thus, the liquid crystal display  601  may display uniform gray-scale without relation of the chromaticity levels of the light emitted from the white LED  111 , thereby improving image display quality and reducing manufacturing cost. 
         [0060]    Hereinafter, the compensation process of the source data SD in the gray-scale compensation unit  501  will be described in detail with reference to  FIGS. 4 and 5 . 
         [0061]    Referring to  FIGS. 1 and 4 , the sensor  400  senses the light amount and the color coordinates of the light generated by the backlight assembly  100  to generate the sensing information SI, and provides the sensing information SI to the controlling part  520  (S 110 ). The sensor  400  generates the sensing information SI every time the drive of the liquid crystal display panel  200  starts, for example. 
         [0062]    The controlling part  520  receives the source data SD (S 120 ). 
         [0063]    Then, the controlling part  520  reads out the second compensation data GCD 2  corresponding to the sensing information SI and the source data SD from the data storing part  510  (S  130 ). 
         [0064]    Referring to  FIGS. 1 and 5 , the controlling part  520  selects the look-up table, corresponding to the sensing information SI, from among the first to p-th look-up tables  511 - 1 ˜ 511 - p  (S 131 ). 
         [0065]    Next, the controlling part  520  reads out the second compensation data GCD 2  from the selected look-up corresponding to the color and gray-scale of the source data SD and provides the read-out second compensation data GCD 2  to the data generating part  530  (S 133 ). 
         [0066]    Referring to  FIGS. 1 and 4  again, the data generating part  530  generates the third compensation data GCD 3  using the second compensation data GCD 2  and the source data SD and provides the third compensation data GCD 3  to the dithering part  540  (S 140 ). 
         [0067]    The dithering part  540  dithers the third compensation data GCD 3  after bit-contracting the third compensation data GCD 3  and provides the first compensation data GCD 1  to the data driver  310  (S 150 ) 
         [0068]    The data driver  310  converts the first compensation data GCD  1  into the gray-scale voltages and provides the gray-scale voltages to the liquid crystal display panel  200  (S 160 ). As a result, the liquid crystal display panel  200  may display the image corresponding to the chromaticity levels of the light generated by the backlight assembly  100  and the source data SD. 
         [0069]    In  FIG. 6 , a liquid crystal display  602  includes the same configuration and function as those of the liquid crystal display  610  shown in  FIG. 1  except for the gray-scale compensation unit  502 . In  FIG. 6 , the same reference numerals denote the same elements in  FIG. 1 , and thus the detailed descriptions of the same elements will be omitted. 
         [0070]    The liquid crystal display  602  includes a backlight assembly  100 , a liquid crystal display panel  200 , a data driver  310 , a gate driver  320 , a sensor  400 , and a gray-scale compensation unit  502 . 
         [0071]    The gray-scale compensation unit  502  includes a data storing part  510 , a controlling part  520 , and a dithering part  540 . Since the data driver  510 , the controlling part  520 , and the dithering part  540  have the same configuration and function as those in  FIG. 1 , their detailed descriptions will be omitted. 
         [0072]    Referring to  FIGS. 3 and 6 , the data storing part  510  includes first to p-th look-up tables  511 - 1 ˜ 1511 - p . Third compensation data GCD 3  obtained by bit-expanding M-bit source data SD provided to the controlling part  510  are stored in each of the first to p-th look-up tables  511 - 1 ˜ 511 - p . That is, the data storing part  510  stores the third compensation data GCD 3  generated corresponding to each of the red, green and blue colors in each gray-scale of M-bit. 
         [0073]    The first to p-th look-up tables  511 - 1 ˜ 511 - p  are generated corresponding to the chromaticity levels in one-to-one fashion, and the number of the look-up tables  511 - 1 ˜ 511 - p  are the same as the number of the chromaticity levels. 
         [0074]    Each of the third compensation data GCD 3  is stored in a corresponding look-up table, which has the same chromaticity level, of the look-up tables  511 - 1 ˜ 511 - p . The third compensation data GCD 3  stored in the first to p-th look-up tables  511 - 1 ˜ 511 - p  are stored corresponding to the red, green and blue colors in each gray-scale of M-bit. 
         [0075]    The third compensation data stored in the first to p-th look-up tables  511 - 1 ˜ 511 - p  is read out by the controlling part  520 . The controlling part  520  receives the source data SD and the sensing information SI and reads out the third compensation data GCD 3  corresponding to the source data SD and the sensing information SI. The controlling part  520  provides the read-out third compensation data GCD 3  to the dithering part  540 . 
         [0076]    The dithering part  540  contracts the number of bits of the third compensation data GCD 3  considering the data bits of the data driver  310  and dithers the third compensation data GCD 3  to generate the first compensation data GCD 1 . The dithering part  540  provides the first compensation data GCD 1  to the data driver  310 , and the data driver  310  converts the first compensation data GCD  1  into the gray-scale voltages and provides the gray-scale voltages to the liquid crystal display panel  200 . 
         [0077]    As described above, since the third compensation data obtained by bit-expanding the M-bit gray-scales levels are stored in the data storing part  520 , the gray-scale compensation unit  502  does not need to perform the calculation process for the third compensation data GCD 3 . Thus, the data-processing speed of the liquid crystal display  602  may be improved. 
         [0078]      FIG. 7  is a flowchart illustrating a driving method of the liquid crystal display of  FIG. 6 , and  FIG. 8  is a flowchart illustrating a data read-out process of third compensation data of  FIG. 7 . 
         [0079]    Referring to  FIGS. 6 and 7 , the sensor  400  senses the light amount and the color coordinates of the light generated by the backlight assembly  100  to generate the sensing information SI, and the sensor  400  provides the sensing information SI to the controlling part  520  (S 210 ). The sensor  400  generates the sensing information SI every time the drive of the liquid crystal display panel  200  starts, for example. 
         [0080]    The controlling part  520  receives the source data SD (S 220 ). 
         [0081]    Then, the controlling part  520  reads out the third compensation data GCD 3  corresponding to the sensing information SI and the source data SD from the data storing part  510  (S 230 ). 
         [0082]    Referring to  FIGS. 7 and 8 , the controlling part  520  selects the look-up table, corresponding to the sensing information SI, from among the first to p-th look-up tables  511 - 1 ˜ 511 - p  (S 231 ). 
         [0083]    Next, the controlling part  520  reads out the third compensation data GCD 3  from the selected look-up corresponding to the color and gray-scale of the source data SD and provides the read-out third compensation data GCD 3  to the dithering part  540  (S 233 ). 
         [0084]    Referring to  FIGS. 6 and 7  again, the data generating part  530  generates the third compensation data GCD 3  using the second compensation data GCD 2  and the source data SD and provides the third compensation data GCD 3  to the dithering part  540  (S 140 ). 
         [0085]    The dithering part  540  dithers the third compensation data GCD 3  after bit-contracting the third compensation data GCD 3  and provides the first compensation data GCD 1  to the data driver  310  (S 240 ) 
         [0086]    The data driver  310  converts the first compensation data GCD 1  into the gray-scale voltages and provides the gray-scale voltages to the liquid crystal display panel  200  (S 250 ). Accordingly, the liquid crystal display panel  200  may display the image corresponding to the chromaticity levels of the light generated by the backlight assembly  100  and the source data SD. 
         [0087]    In  FIG. 9 , the same reference numerals denote the same elements in  FIG. 1 , and thus the detailed description of the same elements will be omitted. 
         [0088]    Referring to  FIG. 9 , a liquid crystal display  603  includes a backlight assembly  100 , a liquid crystal display panel  200 , a data driver  310 , a gate driver  320 , a sensor  400 , and a gray-scale compensation unit  503 . 
         [0089]    The gray-scale compensation unit  503  includes a data storing part  550 , a controlling part  520 , a data generating part  530 , and a dithering part  540 . Since the controlling part  520 , the data generating part  530 , and the dithering part  540  have the same configuration and function as those in  FIG. 1 , their detailed descriptions will be omitted. 
         [0090]    The data storing part  550  stores a plurality of second compensation data GCD 2  corresponding to one of the chromaticity levels, and the second compensation data GCD 2  are the same as the second compensation data GCD 2  shown in  FIG. 1 . In particular, the second compensation data GCD 2  stored in the data storing part  550  are set by an external setting unit  700  while the liquid crystal display  603  is manufactured. 
         [0091]    The setting unit  700  stores the second compensation data GCD 2  generated corresponding to the chromaticity levels in each gray-scale of M-bit. The setting unit  700  includes a plurality of look-up tables in which the second compensation data are stored, and the look-up tables of the setting unit  700  are the same as the first to p-th look-up tables  511 - 1 ˜ 511 - p  of the data storing part  510  shown in  FIG. 3 . 
         [0092]    When the liquid crystal display  603  is initially set, the setting unit  700  receives sensing information SI corresponding to the backlight assembly  100  from the sensor  400 . The setting unit  700  receives the sensing information SI from the sensor  400 , but may receive the sensing information SI through the controlling part  520 . 
         [0093]    The setting unit  700  selects a look-up table corresponding to the sensing information SI and stores the selected look-up table in the data storing part  550 . Thus, the data storing part  550  stores only one look-up table, so the data storing part  550  stores the second compensation data corresponding to an initial chromaticity level of the backlight assembly  100 . 
         [0094]    Similarly to the gray-scale compensation unit  501  shown in  FIG. 1 , the gray-scale compensation unit  503  includes the data generating part  530 , but the data generating part  530  may be removed from the gray-scale compensation unit  503 . In this case, the setting unit  700  stores a plurality of third compensation data GCD 3  generated corresponding to each chromaticity level in each gray-scale of M-bit, and the third compensation data GCD 3  are the same as the third compensation data GCD 3  shown in  FIG. 6 . Accordingly, the look-up table of the data compensation part  550  stores the third compensation data GCD 3  corresponding to the initial chromaticity level of the backlight assembly  100 . 
         [0095]      FIG. 10  is a flowchart illustrating a driving method of the liquid crystal display of  FIG. 9 . 
         [0096]    Referring to  FIGS. 9 and 10 , the setting unit  700  receives the sensing information SI from the sensor  400  (S 310 ) and reads out the second compensation data corresponding to the sensing information SI among pre-stored second compensation data in order to store the read-out second compensation data in the data storing part  550  (S 320 ). Thus, the data setting process for gray-scale compensation of the liquid crystal display  603  is completed when manufacturing the liquid crystal display  603   
         [0097]    The read-out process of the second compensation data corresponding to the sensing information SI is as follows. The look-up table corresponding to the sensing information SI (i.e., the initial chromaticity level of the backlight assembly  100 ) is selected from the look-up tables that are pre-stored in the setting unit  700 . Then, the setting unit  700  stores the selected look-up table in the data storing part  550 , so that the second compensation data corresponding to the initial chromaticity level of the backlight assembly  100  may be stored in the data storing part  550 . 
         [0098]    When the initial setting process of the liquid crystal display  603  is completed, the controlling part  520  receives source data SD (S 330 ), reads out the second compensation data GCD 2  corresponding to the source data SD from the data storing part  550 , and provides the read-out second compensation data GCD 2  to the data generating part  530  (S 340 ). 
         [0099]    The data generating part  530  and the dithering part  540  generate the first compensation data GCD 1  using the second compensation data GCD 2  (S 350 ). The processes of generating the first compensation data GCD 1  using the second compensation data GCD 2  are the same as those of  FIG. 4 , and thus the detailed descriptions thereof will be omitted. 
         [0100]    The data driver  310  converts the first compensation data GCD 1  from the dithering part  540  into the gray-scale voltages and provides the gray-scale voltages to the liquid crystal display panel  200  (S 360 ). 
         [0101]    The data storing part  550  stores the second compensation data corresponding to the sensing information SI, however the data storing part  550  may store the third compensation data corresponding to the sensing information SI. In this case, the controlling part  520  reads out the third compensation data GCD 3  corresponding to the source data SD from the data storing part  550  and provides the read-out third compensation data GCD 3  to the dithering part  540 . The dithering part  540  generates the first compensation data GCD 3  using the third compensation data GCD 3 . 
         [0102]    According to the above, the gray-scale compensation unit compensates the source data according to the chromaticity levels of the backlight assembly. Thus, the liquid crystal display may display the image having uniform gray-scale without relation of the chromaticity levels of the backlight assembly, thereby improving the image display quality and reducing the manufacturing cost. 
         [0103]    Although exemplary embodiments of the present invention have been described, it is understood that the present invention should not be limited to these exemplary embodiments but various changes and modifications can be made by one ordinary skilled in the art within the spirit and scope of the disclosure.