Patent Publication Number: US-2012038691-A1

Title: Method of driving a light source and display apparatus for performing the method

Description:
This application claims priority to Korean Patent Application No. 2010-77899, filed on Aug. 12, 2010, and all the benefits accruing therefrom under 35 U.S.C. §119, the content of which in its entirety is herein incorporated by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     Exemplary embodiments of the present invention relate to a method of driving a light source and a display apparatus for performing the method. More particularly, exemplary embodiments of the present invention relate to a method of driving a light source including edge type light-emitting diodes (“LEDs”) and a display apparatus for performing the method. 
     2. Description of the Related Art 
     Generally, a display apparatus displays a two-dimensional (“2D”) image. Recently, due to high demands for three-dimensional (“3D”) image displays in various fields such as games and movies, for example, display apparatuses for displaying the 3D image have been continuously developed. A 3D image may be perceived by an observer when the observer watches two different 2D images through a left eye and a right eye, respectively, and the two different 2D images are combined in the observer&#39;s brain. 
     A 3D image display apparatus typically displays a 3D image using a binocular parallax through two eyes of the observer. That is, images of an object are viewed at different angles by each of the two eyes and the images viewed at different angles are inputted to the observer&#39;s brain since the two eyes of the observer are spaced apart from each other. 
     Conventional 3D image display apparatus using the binocular parallax may be divided into a stereoscopic type (with glasses) display apparatus and an autostereoscopic type (without glasses) display apparatus. The stereoscopic type display apparatus may be divided into an anaglyph type display apparatus and a shutter glasses type display apparatus, for example. In the anaglyph type display apparatus, a pair of glasses having a blue lens and a red lens is typically used. In the shutter glasses type display apparatus, a left-eye image and a right-eye image are temporally divided to be displayed thereon in a period, and a pair of glasses, in which a left-eye shutter and a right-eye shutter are closed and opened in a synchronized manner with the period, is typically used. 
     Since a 3D liquid crystal display (“LCD”) apparatus is generally driven in a progressive scan method, time points at which a line data is applied to a plurality of horizontal lines of the LCD apparatus are different from each other, and liquid crystal responses at a same time point are different from each other. Thus, when a 3D image is displayed on a screen of the LCD apparatus by alternately displaying a left-eye image and a right-eye image, a substantial amount of crosstalk may be generated due to different gradations between the left-eye image and the right-eye image and different display timings between the left-eye image and the right-eye image when driven by the progressive scan method. The crosstalk may substantially decrease a display quality of a 3D image. In addition, direct-illumination type light emitting diodes (“LED”s) and edge type LEDs may be used to prevent the crosstalk. However, a serial communication is typically employed to drive a light source such as the direct-illumination type LEDs and edge type LEDs. Thus, manufacturing costs of the LCD apparatus may substantially increase when direct-illumination type LEDs and edge type LEDs are used. 
     SUMMARY OF THE INVENTION 
     Exemplary embodiments of the present invention provide a method of driving a light source that substantially increases display quality and substantially decreases manufacturing cost. 
     Exemplary embodiments of the present invention also provide a display apparatus that performs the method above. 
     According to one exemplary embodiment, provides a method of driving a light source comprising a first light-emitting module including first to k-th light source blocks and disposed at a first edge of a light guide plate, and a second light-emitting module including first to m-th light source blocks and disposed at a second edge of the light guide plate, wherein k and m are natural numbers. The method includes generating a plurality of duty control signals based on an image signal, where the plurality of duty control signals correspond to the first to k-th top light source blocks of the first light-emitting module and the first to m-th bottom light source blocks of the second light-emitting module, and selectively generating first to k-th top driving signals and first to m-th bottom driving signals using the plurality of duty control signals based on a three-dimensional image enable signal, where the first to k-th top driving signals drive the first light-emitting module, and the first to m-th bottom driving signals drive the second light-emitting module. 
     In an exemplary embodiment, generating the plurality of duty control signals may include determining first to k-th top duty ratios and first to m-th bottom duty ratios based on the image signal, and generating first to k-th top duty control signals and first to m-th bottom duty control signals using the first to k-th top duty ratios and the first to m-th bottom duty ratios, respectively. 
     In an exemplary embodiment, determining the first to k-th top duty ratios and the first to m-th bottom duty ratios may include: obtaining a representative luminance value by analyzing the image signal corresponding to the first to k-th top light source blocks and the first to m-th bottom light source blocks; and determining the first to k-th top duty ratios and the first to m-th bottom duty ratios using the representative luminance value, where the first to k-th top duty ratios control a brightness of the first to k-th top light source blocks, and the first to m-th bottom duty ratios control a brightness of the first to m-th bottom light source blocks. 
     In an exemplary embodiment, selectively generating the first to k-th top driving signals and the first to m-th bottom driving signals may include: generating the first to k-th top driving signals using the first to k-th top duty control signals received in parallel when the three-dimensional image enable signal is low; and generating the first to m-th bottom driving signals using the first to m-th bottom duty control signals received in parallel, when the three-dimensional image enable signal is low. 
     In an exemplary embodiment, selectively generating the first to k-th top driving signals and the first to m-th bottom driving signals may include generating the first to k-th top driving signals using the first to k-th top duty control signals received in parallel during a first interval when the three-dimensional image enable signal is high, and generating the first to m-th bottom driving signals using the first to m-th bottom duty control signals received in parallel during a second interval, when the three-dimensional image enable signal is high. 
     In an exemplary embodiment, the first light-emitting module may be turned on by the first to k-th top driving signals during the first interval, and the second light-emitting module may be turned off by the first to k-th top driving signals during the first interval. The second light-emitting module may be turned on turned on by the first to m-th bottom driving signals during the second interval, and the first light-emitting module may be turned off by the first to m-th bottom driving signals during the second interval. 
     In an exemplary embodiment, the first to k-th top driving signals may be generated by boosting the first to k-th top duty control signals, and the first to m-th bottom driving signals may be generated by boosting the first to m-th bottom duty control signals. 
     In an exemplary embodiment, each of the first and second intervals may correspond to a single frame interval. 
     According to another aspect of the present invention, a display apparatus includes a display panel and a light source module. The display panel displays a first image during an N-th frame included in a first interval and an (N+1)-th frame included a second interval, where N is a natural number. The light source module includes a first light-emitting module, a second light-emitting module and a light source driving part. The first light-emitting module includes first to k-th top light source blocks disposed adjacent to a first edge of a light guide plate, where k is a natural number. The second light-emitting module includes first to m-th bottom light source blocks disposed adjacent to a second edge of the light guide plate, where m is a natural number, and the second edge is disposed opposite to the first edge. The light source driving part generates first to k-th top duty control signals and first to m-th bottom duty control signals based on the first image, selectively generates first to k-th top driving signals and first to m-th bottom driving signals using the first to k-th duty control signals and the first to m-th duty control signals, respectively, based on a three-dimensional image enable signal, and drives the first light-emitting module during the first interval and the second light-emitting module during the second interval, where the first to k-th top duty control signals correspond to the first to k-th top light source blocks, and the first to m-th bottom duty control signals correspond to the first to m-th bottom light source blocks, and where the first to k-th top driving signals drive the first light-emitting module, and the first to m-th bottom driving signals drive the second light-emitting module. 
     In an exemplary embodiment, the display apparatus may further include a shutter glasses including a first shutter and a second shutter. The display panel may display a second image during an (N+2)-th frame included in the first interval and an (N+3)-th frame included in the second interval. The first shutter may be opened and the second shutter may be closed in correspondence with the N-th frame and the (N+1)-th frame. The first shutter may be closed and the second shutter may be opened in correspondence with the (N+2)-th frame and the (N+3)-th frame. 
     In an exemplary embodiment, the shutter glasses may open and close the first shutter after a preset time in response to a vertical start signal of a left-eye image of the first image, and the shutter glasses may open and close the second shutter after the preset time in response to a vertical start signal of a right-eye image of the second image. 
     In an exemplary embodiment, the light source driving part may include a dimming level determining part and a duty control signal generating part. The dimming level determining part determines the first to k-th top duty ratios and first to m-th bottom duty ratios using the first image and the second image. The duty control signal generating part generates the first to k-th top duty control signals and the first to m-th bottom duty control signals using the first to k-th top duty ratios and the first to m-th bottom duty ratios. 
     In an exemplary embodiment, the dimming control part may include an image analyzing part and a dimming level determining part. The image analyzing part obtains a representative luminance value by analyzing the first image and the second image corresponding to the first to k-th top light source blocks and the first to m-th bottom light source blocks to. The dimming level determining part determines the first to k-th top duty ratios and the first to m-th bottom duty ratios using the representative luminance value, where the first to k-th top duty ratios control a brightness of the first to k-th top light source blocks, and the first to m-th bottom duty ratios control a brightness of the first to m-th bottom light source blocks. 
     In an exemplary embodiment, the duty control signal generating part may include a first converting part and a second converting part. The first converting part generates the first to k-th top driving signals using the first to k-th top duty control signals when the three-dimensional image enable signal has a low level, and generates the first to k-th top driving signals using the first to k-th top duty control signals during a first interval when the three-dimensional image enable signal has a high level. The second converting part generates the first to m-th bottom driving signals using the first to m-th bottom duty control signals when the three-dimensional image enable signal has a low level, and generates the first to m-th bottom driving signals using the first to m-th bottom duty control signals during a second interval when the three-dimensional image enable signal has a high level. 
     In an exemplary embodiment, the first converting part may include a first switching part and a first driving part. The first switching part transmits the first to k-th top duty control signals in response to a first enable signal, and blocks the first to k-th top duty control signals in response to a second enable signal, where the first enable signal has a high level in correspondence with the first interval, and the second enable signal has a high level in correspondence with the second interval. The first driving part generates the first to k-th top driving signals using the first to k-th top duty control signals provided from the first switching part, and drives the first light-emitting module. 
     In an exemplary embodiment, the second converting part may include a second switching part and a second driving part. The second switching part transmits the first to m-th bottom duty control signals in response to the second enable signal, and blocks the first to m-th bottom duty control signals in response to the first enable signal, where the first enable signal has a high level in correspondence with the first interval, and the second enable signal has a high level in correspondence with the second interval. The second driving part generates the first to m-th bottom driving signals using the first to m-th bottom duty control signals provided from the second switching part, and drives the second light-emitting module. 
     In an exemplary embodiment, the first switching part may include first to k-th switches, and the second switching part may include first to m-th switches. 
     In an exemplary embodiment, each of the first driving part and the second driving part may boost the first to k-th top duty control signals and the first to m-th bottom duty control signals, respectively, in response to the three-dimensional image enable signal. 
     In an exemplary embodiment, the first enable signal may be synchronized with a first image data of the first image after a preset time in response to a vertical start signal of a left-eye image included in the first image, and the second enable signal may be synchronized with a first image data of the second image after the preset time in response to a vertical start signal of a right-eye image included in the second image. 
     In an exemplary embodiment, the first image may include a left-eye image and a black image, and the second image may include a right-eye image and the black image. The left-eye image included in the first image may be sequentially displayed on first to k-th display blocks of the display panel during the N-th frame and the (N+1)-th frame, and the right-eye image included in the second image may be sequentially displayed on the first to k-th display blocks of the display panel during the (N+2)-th frame and the (N+3)-th frame. 
     According to a method of driving a light source and a display apparatus for performing the method, a first light-emitting module and a second light-emitting module using edge type light-emitting diodes (“LEDs”) are driven using first to k-th top duty control signals parallelly applied to a display apparatus, so that the display apparatus may be driven in a dimming driving mode. In exemplary embodiments of the display apparatus which displays a three-dimensional image, the crosstalk generated therein is substantially decreased, the display quality of the display apparatus is substantially enhanced, and the manufacturing cost of the display apparatus is substantially reduced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features and advantages of the present invention will become more apparent by describing in detailed exemplary embodiments thereof with reference to the accompanying drawings, in which: 
         FIG. 1  is a block diagram illustrating an exemplary embodiment of a display apparatus according to the present invention; 
         FIG. 2  is a block diagram illustrating an exemplary embodiment of an image converting part of  FIG. 1 ; 
         FIG. 3  is a schematic circuit diagram illustrating a first light-emitting module, a second light-emitting module and a duty control signal converting part of an exemplary embodiment of a light source module  400  in  FIG. 1 ; 
         FIGS. 4A and 4B  are perspective plan views illustrating a shutter glasses, a display panel, a light-guide plate, a first light-emitting module and a second light-emitting module that are used when a three-dimensional (“3D”) image is displayed on the display apparatus of  FIG. 1 ; and 
         FIGS. 5A and 5B  are signal timing diagrams of signals used in an exemplary embodiment of a driving method of first and second light-emitting modules of  FIG. 1  and an exemplary embodiment of an image display method of a display apparatus using the driving method. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The invention is described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. 
     It will be understood that when an element or layer is referred to as being “on” or “connected to” another element or layer, the element or layer can be directly on or connected to another element or layer or intervening elements or layers. In contrast, when an element is referred to as being “directly on” or “directly connected to” another element or layer, there are no intervening elements or layers present. As used herein, connected may refer to elements being physically and/or electrically connected to each other. Like numbers refer to like elements throughout. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     It will be understood that, although the terms first, second, third, etc., may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the invention. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a,” “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     All methods described herein can be performed in a suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”), is intended merely to better illustrate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention as used herein. 
     Hereinafter, the invention will be explained in detail with reference to the accompanying drawings. 
       FIG. 1  is a block diagram illustrating an exemplary embodiment of a display apparatus according to the present invention. 
     Referring to  FIG. 1 , the display apparatus includes a display unit  100 , an image converting part  200 , a timing control part  300  and a light source module  400 . The display apparatus may selectively display a two dimensional (“2D”) image and a three-dimensional (“3D”) image. The display apparatus includes a display panel  110 . In an exemplary embodiment, the display panel  100  may be a full high definition (“FHD”) display panel having a high resolution, such as a resolution of 1920×1080, for example. The display unit  100  further includes a panel driving part  130  which drives the display panel  110 . The panel driving part  130  includes a data driving part  132  and a gate driving part  134 . 
     The display panel  110  displays images based on a data signal outputted from the data driving part  132  and a gate signal outputted from the gate driving part  134 . 
     The display panel  110  may include two substrates and a liquid crystal interposed between the two substrates. The display panel  110  may include a plurality of pixels for displaying images. Each of the pixels may include a switching element electrically connected to a gate line and a data line, a liquid crystal capacitor electrically connected to the switching element and a storage capacitor electrically connected to the switching element. 
     The data driving part  132  converts a digital data signal into a data voltage, which may be an analog voltage, based on a first control signal CONT 1  and an image data DATA that are received from the timing control part  300 , and then outputs the data voltage to data lines. 
     The gate driving part  134  generates gate signals to be applied to gate lines disposed on the display panel  110  based on a second control signal CONT 2  received from the timing control part  300 , and sequentially outputs the gate signals to the gate lines. 
     The image converting part  200  receives a first image signal from a video system (not shown) disposed at an outside. The first image signal may be a 2D image signal or a 3D image signal. When the first image signal is the 3D image signal, the image converting part  200  divides the first image signal into a left-eye image signal and a right-eye image signal to recombine a left-eye and right-eye images, and then provides the timing control part  300  with a first output image  201   a . When the first image signal is the 2D image signal, the image converting part  200  provides the timing control part  300  with a second output image  201   b.    
     The timing control part  300  receives a control signal CONT applied from an external device (not shown), generates the first control signal CONT 1  for controlling a driving timing of the data driving part  132  and the second control signal CONT 2  for controlling a driving timing of the gate driving part  134 , and provides the data driving part  132  and the gate driving part  134  with the first control signal CONT 1  and the second control signal CONT 2 , respectively. The timing control part  300  provides an image analyzing part  452  of the light source driving part  450  with a third control signal CONT 3  for controlling a driving timing of the light source driving part  450  and a second image signal DS for generating driving signals of the light source driving part  450 . 
     The light source module  400  includes a light guide plate (“LGP”)  401 , a first light-emitting module  410 , a second light-emitting module  430  and a light source driving part  450 . 
     In an exemplary embodiment, the first light-emitting module  410  is disposed adjacent to a first edge of the LGP  401 , and the second light-emitting module  430  is disposed adjacent to a second edge of the LGP  401 . The first and second light-emitting modules  410  and  430  include first to k-th top light source blocks and first to m-th bottom light source blocks, respectively. Here, ‘k’ and ‘m’ are natural numbers. In an exemplary embodiment, each of the light source blocks may include a plurality of light-emitting diodes (“LED”s). In an exemplary embodiment, the number of light source blocks of the first light-emitting module  410  may be equal to the number of light source blocks of the second light-emitting module  430 . That is, ‘k’ is equal to ‘m’. In an alternative exemplary embodiment, the number of light source blocks of the first light-emitting module  410  may be different from the number of light source blocks of the second light-emitting module  430 . That is, ‘k’ is different from ‘m’. Hereinafter, for convenience of description, an exemplary embodiment, in which ‘k’ is equal to ‘m,’ will be explained. 
     The light source driving part  450  includes a dimming control part  451  and a duty control signal converting part  457 . 
     The dimming control part  451  includes an image analyzing part  452 , a dimming level determining part  453  and a duty control signal generating part  455 . 
     The image analyzing part  452  determines representative luminance values of the first to k-th top light source blocks and the first to m-th bottom light source blocks using a third control signal CONT 3  and a second image signal DS, which are provided from the timing control part  300 . In an exemplary embodiment, the image analyzing part  452  analyzes a second image signal of a frame unit to determine a representative value of a display block DB when lights irradiated from the first to k-th light source blocks and first to m-th light source blocks are incident on the display panel  110 . The representative luminance value of the light source blocks may be determined using a representative value of gray levels of image signal corresponding to the display block, such as a maximum value, an average value, a weighted average value and an optimum value between the maximum value or the average value, for example. 
     The dimming level determining part  453  determines first to k-th top duty ratios corresponding to amounts of light emitted by the first to k-th top light source blocks and first to m-th bottom duty ratios corresponding to amounts of light emitted by the first to m-th bottom light source blocks using the representative luminance values. 
     The duty control signal generating part  455  generates the first to k-th top control signals which control the amounts of light emitted by the first to k-th top light source blocks using the first to k-th top duty ratios. The duty control signal generating part  455  generates the first to m-th bottom control signals which control the amounts of light emitted by the first to m-th bottom light source blocks using the first to m-th bottom duty ratios. 
     The duty control signal generating part  455  generates the first to k-th top duty control signals having a predetermined frequency and the first to m-th bottom duty control signals using the third control signal CONT 3 . In an exemplary embodiment, the third control signal CONT 3  may include the vertical start signal and a horizontal synchronization signal. 
     The duty control signal converting part  457  converts the first to k-th top duty control signals and the first to m-th bottom duty control signals, in which a pulse width and a frequency are controlled in the duty control signal generating part  455 , into first to k-th top driving signals and first to m-th bottom driving signals that are applied to the first light-emitting module  410  and the second light-emitting module  430 , respectively. 
     In an exemplary embodiment, the duty control signal converting part  457  may include a converter which converts a direct current (“DC”) voltage into an alternating current (“AC”) voltage. 
       FIG. 2  is a block diagram illustrating an exemplary embodiment of the image converting part  200  of  FIG. 1 . 
     Referring to  FIGS. 1 and 2 , the image converting part  200  includes a mode determining part  210 , a dividing part  220 , a scaler  230  and a black image generating part  240 . 
     The mode determining part  210  determines a mode of the first image signal. In an exemplary embodiment, when the first image signal is the 3D image signal, the mode determining part  210  delivers the first image signal to dividing part  220 , and the first image signal is thereby processed so that a first output image  201   a  is provided to the timing control part  300 . When the first image signal is the 2D image signal, the mode determining part  210  may provide the first image signal as a second output image  201   b  directly to the timing control part  300 . 
     When the first image signal is the 3D image signal, a left-eye image signal and a right-eye image signal are included in the 3D image signal. Thus, the dividing part  220  divides the first image signal received from the mode determining part  210  into the left-eye image signal and the right-eye image signal. 
     The scaler  230  converts resolutions of the left-eye image signal and the right-eye image signal received from the dividing part  220  to correspond to a resolution of the display panel  110 , and then delivers the converted left-eye and right-eye image signals to the black image generating part  240 . 
     The black image generating part  240  generates a black image. The black image generating part  240  inserts the black image between the left-eye image and the right-eye image received from the scaler  230  to generate the first output image  201   a , and then outputs the first output image  201   a  to the timing control part  300 . 
     When the first output image  201   a  or the second output image  201   b  is applied to the timing control part  300 , the timing control part  300  controls a display timing of the first and second output images  201   a  and  201   b , so that each of the first and second output images  201   a  and  201   b  is displayed to correspond to the display block DB of the display panel  110 . 
       FIG. 3  is a schematic circuit diagram illustrating a first light-emitting module  410 , a second light-emitting module  430  and a duty control signal converting part  457  of an exemplary embodiment of the light source module  400  in  FIG. 1 . 
     Referring to  FIGS. 1 and 3 , the duty control signal converting part  457  includes a boosting part  457   a , a first converting part  457   b  and a second converting part  457   c.    
     The boosting part  457   a  includes an inductor L, a diode D, a switching element SW and a converter  457   a   1 . 
     The switching element SW is electrically connected to the inductor L, the diode D and the converter  457   a   1 . The first light-emitting module  410  and the second light-emitting module  430  are connected to a cathode of the diode D. A first terminal of the inductor L and an anode of the diode D are connected to the converter  457   a   1  via the switching element SW. An output terminal of the boosting part  457   a  is commonly connected to anodes of light source blocks in which a plurality of light-emitting diodes is serially connected to one another. 
     The converter  457   a   1  may convert the input voltage Vin into an output voltage Vout that is boosted. 
     Thus, when an input voltage Vin is applied to the inductor L, the input voltage Vin is boosted to be converted as the output voltage Vout, and the output voltage Vout may be provided to the first light-emitting module  410  and the second light-emitting module  430 . 
     In an exemplary embodiment, the input voltage Vin and the output voltage Vout may be DC voltages. 
     The first converting part  457   b  includes a first switching part  457   d   1  and a first driving part  457   d   2 . 
     The second converting part  457   c  includes a second switching part  457   e   1  and a second driving part  457   e   2 . 
     The first switching part  457   d   1  includes a plurality of first switches SE 1 , and the second switching part  457   e   1  includes a plurality of second switches SE 2 . In an exemplary embodiment, the first switching part  457   d   1  may include first to k-th switches, and the second switching part  457   e   1  may include first to m-th switches. Here, ‘k’ and ‘m’ are natural numbers. Hereinafter, a description for the first and second switching parts  457   d   1  and  457   e   1  will be described in greater detail with reference to an exemplary embodiment shown in  FIG. 3  in which ‘k’ and ‘m’ are equal to each other. However, the numbers of switches in the first and second switching parts  457   d   1  and  457   e   1  are not limited to the exemplary embodiment shown in  FIG. 3 . In an alternative exemplary embodiment, the numbers of switches in the first and second switching parts  457   d   1  and  457   e   1  may be different from each other, that is, ‘k’ and ‘m’ are not equal to each other. 
     The first switching part  457   d   1  and the second switching part  457   e   1  receive the first to k-th top duty control signals PWM 1  to PWMk and the first to m-th bottom duty control signals PWM 1  to PWMm, respectively, from the duty control signal generating part  455  of  FIG. 1 . In an exemplary embodiment, when ‘m’ and ‘k’ are equal to each other, the first to k-th top duty control signals PWM 1  to PWMk may be applied to the first switching part  457   d   1  and the second switching part  457   e   1  in parallel, as shown in  FIG. 3 . 
     The first switching part  457   d   1  may further receive a first enable signal TE, and the second switching part  457   e   1  may further receive a second enable signal BE. 
     The first switches SE 1  of the first switching part  457   d   1  may provide the first driving part  457   d   2  with the first to k-th top duty control signals PWM 1  to PWMk in response to the first enable signal TE. The second switches SE 2  of the second switching part  457   e   1  may provide the second driving part  457   e   2  with the first to k-th top duty control signals PWM 1  to PWMk in response to the second enable signal BE. 
     In an exemplary embodiment, the 3D image enable signal 3DE is applied to the first driving part  457   d   2  and the second driving part  457   e   2 . The 3D image enable signal 3DE has a low value when the second image signal DS is a 2D image signal, and the 3D image enable signal 3DE has a high value when the second image signal DS is a 3D image signal. 
     The first enable signal TE and the second enable signal BE may have a high value when the second image signal DS is a 2D image signal, and the first enable signal TE and the second enable signal BE may have complementary values when the second image signal DS is a 3D image signal. In an exemplary embodiment, when the second image signal DS is the 3D image signal, the second enable signal BE has a low value and the first enable signal TE has a high value, or the second enable signal BE has a high value and the first enable signal TE has a low value. 
     The first driving part  457   d   2  and the second driving part  457   e   2  convert the first to k-th top duty control signals PWM 1  to PWMk, provided from the first switching part  457   d   1  and the second switching part  457   e   1 , into the first to k-th top driving signals and the first to m-th bottom driving signals that are applied to the first light-emitting module  410  and the second light-emitting module  430 , respectively. In an embodiment, the first driving part  457   d   2  and the second driving part  457   e   2  may output k driving signals when ‘k’ and ‘m’ are equal to each other. 
     When the second image signal DS is the 2D image signal, the first light-emitting module  410  may receive the first to k-th top driving signals by the first enable signal TE having a high value, and the second light-emitting module  430  may receive the first to m-th bottom driving signals that are substantially equal to the first to k-th top driving signals by the second enable signal BE having a high value. Thus, the first light-emitting module  410  and the second light-emitting module  430  may perform a normal dimming driving. 
     When the second image signal DS is the 3D image signal, the first to k-th top duty control signals PWM 1  to PWMk are complementarily provided to the first light-emitting module  410  and the second light-emitting module  430  as the first to k-th top driving signals and the first to m-th bottom driving signals. Thus, the display panel  110  may be driven to display a 3D image. 
       FIGS. 4A and 4B  are perspective plan views illustrating a shutter glasses, a display panel, a light-guide plate, a first light-emitting module and a second light-emitting module that are used when a 3D image is displayed on the display apparatus of  FIG. 1 . 
     Referring to  FIGS. 1 ,  3 ,  4 A and  4 B, an exemplary embodiment of the display panel  110  may include a plurality of display blocks, e.g., a first display block DB 1 , a second display block DB 2 , a third display block DB 3 , a fourth display block DB 4 , a fifth display block DB 5  and a sixth display block DB 6 . The left-eye image or the light-eye image may be sequentially displayed on the first to sixth display blocks DB 1 , DB 2 , DB 3 , DB 4 , DB 5  and DB 6 . 
     Each of the first to sixth light-emitting blocks LEB 1 , LEB 2 , LEB 3 , LEB 4 , LEB 5  and LEB 6  included in the light source module  400  provides lights to each of the first to sixth display blocks DB 1 , DB 2 , DB 3 , DB 4 , DB 5  and DB 6  of the display panel  110 . That is, the first to sixth light-emitting blocks LEB 1 , LEB 2 , LEB 3 , LEB 4 , LEB 5  and LEB 6  may correspond to the first to sixth display blocks DB 1 , DB 2 , DB 3 , DB 4 , DB 5  and DB 6 , respectively. When ‘k’ and ‘m’ are equal to each other in an exemplary embodiment, the display blocks may be indicated as the first to k-th display blocks DB 1  to DBk. 
     In an embodiment, the first to sixth light-emitting blocks LEB 1 , LEB 2 , LEB 3 , LEB 4 , LEB 5  and LEB 6  may be defined by a portion of the LGP  401  which emits lights, incident thereon from corresponding light source blocks of the first and second light-emitting modules  410  and  430 , to a display panel  110 . 
     The first light-emitting module  410  provides the first to sixth light-emitting blocks LEB 1 , LEB 2 , LEB 3 , LEB 4 , LEB 5  and LEB 6  with lights based on the first to sixth top driving signals, and the second light-emitting module  430  provides the first to sixth light-emitting blocks LEB 1 , LEB 2 , LEB 3 , LEB 4 , LEB 5  and LEB 6  with lights based on the first to sixth bottom driving signals. 
     In an exemplary embodiment, as shown in  FIG. 4A , when the left-eye image is displayed on the first to sixth display blocks DB 1 , DB 2 , DB 3 , DB 4 , DB 5  and DB 6 , the first light-emitting module  410  may be turned on and the second light-emitting module  430  may be turned off. Referring to  FIG. 4B , when the left-eye image is displayed on the first to sixth display blocks DB 1 , DB 2 , DB 3 , DB 4 , DB 5  and DB 6 , the second light-emitting module  430  may be turned on and the first light-emitting module  410  may be turned off. 
     That is, when the left-eye image of one frame unit is displayed on the first to sixth display blocks DB 1 , DB 2 , DB 3 , DB 4 , DB 5  and DB 6 , the first light-emitting module  410  and the second light-emitting module  430  are alternately turned on and off. 
     When the first light-emitting module  410  is turned on, a relatively large amount of light is transmitted to a portion of the LGP  401  adjacent to the first light-emitting module  410 , and a relatively small amount of light is transmitted to a portion of the LGP  401  adjacent to the second light-emitting module  430 . Thus, a light amount of the LGP  401  may substantially gradually decrease from a portion adjacent to the first light-emitting module  410  to a portion adjacent to the second light-emitting module  430 . When the second light-emitting module  430  is turned on, a relatively large amount of light is transmitted to the portion of the LGP  401  adjacent to the second light-emitting module  430 , and a relatively small amount of light is transmitted to the portion of the LGP  401  adjacent to the first light-emitting module  410 . Thus, the light amount of the LGP  401  may substantially gradually increase from the portion adjacent to the first light-emitting module  410  to the portion adjacent to the second light-emitting module  430 . 
     The light source module  400  may further include an infrared light generating part (not shown). The infrared light generating part may include a plurality of infrared light sources, e.g., infrared LEDs, that generates infrared lights. The infrared light generating part may generate the infrared lights in response to a synchronization signal that may controls a driving of shutter glasses  600 . 
     The shutter glasses  600  include a left-eye lens part  610  and a right-eye lens part  620 . The left-eye lens part  610  includes a first lens  611  and a first shutter  613 , and the right-eye lens part  620  includes a second lens  621  and a second shutter  623 . The shutter glasses  600  open the first shutter  613  and close the second shutter  623  when the left-eye image is displayed on the display panel  110 , and the shutter glasses  600  open the second shutter  623  and close the first shutter  613  when the right-eye image is displayed on the display panel  110 . 
     As described above, an observer may view a left-eye frame image displayed on the display panel  110  during a single frame. Similarly, the observer may view a right-eye frame image displayed on the display panel  110  during a single. 
       FIGS. 5A and 5B  are signal timing diagrams of signals used in an exemplary embodiment of a driving method of first and second light-emitting modules of  FIG. 1  and an exemplary embodiment of an image display method of a display apparatus using the driving method. 
     Referring to  FIGS. 1 ,  4 A and  5 A, the display panel  110  may be divided into a first display area DA 1 , a second display area DA 2 , a third display area DA 3 , a fourth display area DA 4 , a fifth display area DA 5  and a sixth display area DA 6  based on a light amount of a corresponding portion of the LGP  401 . 
     In an exemplary embodiment, the display panel  110  adjacent to the first light-emitting module  410  may be indicated as the first display area DA 1 , and the display panel  110  adjacent to the second light-emitting module  430  may be indicated as the sixth display area DA 6 . An area between the first and sixth display areas DA 1  and DA 6  may be defined as the second to fifth display areas DA 2 , DA 3 , DA 4  and DA 5   
     First to sixth image data DD 1 , DD 2 , DD 3 , DD 4 , DD 5  and DD 6  may be applied to the first to sixth display areas DA 1 , DA 2 , DA 3 , DA 4 , DA 5  and DA 6 , respectively. 
     In an exemplary embodiment, six image data, e.g., the first to sixth image data DD 1 , DD 2 , DD 3 , DD 4 , DD 5  and DD 6 , are data provided to the first to sixth display areas DA 1 , DA 2 , DA 3 , DA 4 , DA 5  and DA 6  when the display panel  110  is divided into six display areas, e.g., the first to sixth display areas DA 1 , DA 2 , DA 3 , DA 4 , DA 5  and DA 6 . However, the number of display areas is not limited thereto. In an exemplary embodiment, a plurality of gate lines may be divided into P groups (‘P’ is a natural number), and the image data DATA may be thereby divided into P display areas and P image data to correspond to the gate line groups. 
     Each of the first to sixth image data DD 1 , DD 2 , DD 3 , DD 4 , DD 5  and DD 6  alternately provides a left-eye image, a black image and a right-eye image on a display area. 
     In an exemplary embodiment, a left-eye image of a single frame of the first to sixth image data DD 1 , DD 2 , DD 3 , DD 4 , DD 5  and DD 6  is combined with a black image of a single frame and thereby provided to the first to sixth display areas DA 1 , DA 2 , DA 3 , DA 4 , DA 5  and DA 6  during an N-th frame and an (N+1)-th frame (‘N’ is a natural number). That is, as shown in  FIGS. 1 and 5B , a left-eye image L included in the image data DATA is provided to the display panel  110  during the N-th frame, and a black image B included in the image data DATA is provided to the display panel  110  during the (N+1)-th frame. 
     The first to sixth image data DD 1 , DD 2 , DD 3 , DD 4 , DD 5  and DD 6  may be provided to the first to sixth display areas DA 1 , DA 2 , DA 3 , DA 4 , DA 5  and DA 6  of the display panel  110  in accordance with gate on signals sequentially generated at the gate driving part  134  of  FIG. 1 . Thus, as shown in  FIG. 5A , left-eye image signals corresponding to the first to sixth image data DD 1 , DD 2 , DD 3 , DD 4 , DD 5  and DD 6 , respectively, may be sequentially shifted from the left-eye image signal corresponding to the first image data DD 1  to the left-eye image signal corresponding to the sixth image data DD 6 . In an exemplary embodiment, the display apparatus may be driven at a frequency of about 120 Hz in correspondence with a 2D image of  FIG. 5B , and may be driven at a frequency of about 240 Hz in correspondence with a 3D image. 
     Referring again to  FIGS. 3 ,  4 A and  5 A, each of the first driving part  457   d   2  and the second driving part  457   e   2  may be integrated into a single driving chip in an exemplary embodiment. In an alternative exemplary embodiment, the first switching part  457   d   1  and the first driving part  457   d   2  may be integrated into a single chip, and the second switching part  457   e   1  and the second driving part  457   e   2  may be integrated into a single chip. In an exemplary embodiment, an interval of the left-eye image or the right-eye image of the one frame unit may be greater than an interval of the black image in correspondence with each of the first to k-th light-emitting blocks LEB, and a phase variation may be realized. Thus, a luminance decrease may be effectively prevented when the 3D image is displayed thereon. 
     When the first enable signal TE is in a high state, the light amount corresponding to the portion of the LGP  401  adjacent to the first light-emitting module  410  becomes large, and the light amount corresponding to the portion of the LGP  401  adjacent to the second light-emitting module  430  becomes small. In an exemplary embodiment, when the first enable signal TE is in the high state, the second light-emitting module  430  may be turned off. 
     A first shutter signal S 1  that opens the first shutter  613  is turned on during two frames in which the left-eye image and the black image are applied, and then turned off during two frames in which the right-eye image and the black image are applied. In an exemplary embodiment, the two frames may correspond to a unit period of the first enable signal TE or a unit period of the second enable signal BE, as shown in  FIG. 5A . 
     In an exemplary embodiment, the first enable signal TE and the first shutter signal S 1  may be synchronized with each other after a preset time t 0  in response to a vertical start signal of a left-eye image signal included in the first image data DD 1 . 
     Referring again to  FIGS. 4B and 5A , when the second enable signal BE is in a high state, the light amount corresponding to the portion of LGP  401  adjacent to the second light-emitting module  430  becomes large, and the light amount corresponding to the portion of LGP  401  adjacent to the first light-emitting module  410  becomes small. In an exemplary embodiment, when the second enable signal BE is in the high state, the first light-emitting module  410  may be turned off. 
     A second shutter signal S 2  that opens the second shutter  623  is turned on during two frames in which the right-eye image and the black image are applied, and then turned off during two frames in which the left-eye image and the black image are applied. In an exemplary embodiment, the two frames may correspond to a unit period of the first enable signal TE or a unit period of the second enable signal BE. 
     In an exemplary embodiment, the second enable signal BE and the second shutter signal S 2  may be synchronized with each other after the preset time t 0  in response to a vertical start signal of the right-eye image signal included in the first image data DD 1 . 
     Referring again to  FIGS. 3 ,  5 A and  5 B, an image data DATA is provided to the display panel  110 . When the image data DATA correspond to a 2D image during an (N−2)-th frame and an (N−1)-th frame, the 3D image enable signal 3DE has a low value and the first enable signal TE and the second enable signal BE have a high value. 
     Thus, the first converting part  457   b  and the second converting part  457   c  may output the first to k-th top duty control signals PWM 1  to PWMk as the first to k-th top driving signals and the first to m-th bottom driving signals. In an exemplary embodiment, the first and k-th top duty control signals PWM 1  and PWMk may be substantially equal to signals of a first channel CH 1  of the first driving part  457   d   2  and a k-th channel CHk of the first driving part  457   d   2 , respectively. The first and k-th top duty control signals PWM 1  and PWMk may be substantially equal to signals of a first channel CH 1  of the second driving part  457   e   2  and a k-th channel CHk of the second driving part  457   e   2 , respectively. 
     Referring again to  FIG. 5B , a left image may be applied during an N-th frame and an (N+4)-th frame, and a right image may be applied during an (N+2)-th frame. A black image may be applied during an (N+1)-th frame, an (N+3)-th frame and an (N+5)-th frame. 
     Since the image data DATA correspond to the left-eye image or the right-eye image during a first interval, e.g., an N-th frame, an (N+2)-th frame and an (N+4)-th frame, the 3D image enable signal 3DE has a high value, the first enable signal TE has a high value and the second enable signal BE has a low value. 
     Thus, the first converting part  457   b  may output the first to k-th top duty control signals PWM 1  to PWMk, while the second converting part  457   c  may output a signal having a low value. In an exemplary embodiment, signals outputted through the first channel CH 1  of the first driving part  457   d   2  and the k-th channel CHk of the first driving part  457   d   2  are the first and k-th top duty control signals PWM 1  and PWMk in accordance with the N-th frame, the (N+2)-th frame and the (N+4)-th frame. In this case, the first and k-th top duty control signals PWM 1  and PWMk may be boosted about twice to be outputted therethrough. Since the first and k-th top duty control signals PWM 1  and PWMk are boosted, a luminance may be compensated, which is decreased due to the black image inserted in the image data DATA when a 3D image is displayed thereon. In contrast, signals outputted through the first channel CH 1  of the second driving part  457   e   2  and the k-th channel CHk of the second driving part  457   e   2  have a low value in accordance with the N-th frame, the (N+2)-th frame and the (N+4)-th frame. 
     Since the image data DATA corresponds to the black image during a second interval, e.g., an (N+1)-th frame, an (N+3)-th frame and an (N+5)-th frame, the 3D enable signal 3DE has a high value, the first enable signal TE has a low value and the second enable signal BE has a high value. 
     Thus, the second converting part  457   c  outputs the first to k-th top duty control signals PWM 1  to PWMk, while the first converting part  457   b  outputs a signal having a low value. In an exemplary embodiment, signals outputted through the first channel CH 1  of the second driving part  457   e   2  and the k-th channel CHk of the second driving part  457   e   2  are the first and k-th top duty control signals PWM 1  and PWMk in accordance with the (N+1)-th frame, the (N+3)-th frame and the (N+5)-th frame. In this case, the first and k-th top duty control signals PWM 1  and PWMk may be boosted about twice to be outputted therethrough. Since the first and k-th top duty control signals PWM 1  and PWMk are boosted, a luminance may be compensated, which is decreased due to the black image inserted in the image data DATA when a 3D image is displayed thereon. In contrast, signals outputted through the first channel CH 1  of the first driving part  457   d   2  and the k-th channel CHk of the first driving part  457   d   2  have a low value in accordance with the (N+1)-th frame, the (N+3)-th frame and the (N+5)-th frame. 
     Therefore, the first light-emitting module  410  and the second light-emitting module  430  are alternately turned on and off during the first interval and the second interval, so that the first and second light-emitting modules  410  and  430  may perform a blinking operation. 
     Similarly to the first shutter signal S 1 , the first enable signal TE may be substantially synchronized with the first image data DD 1  after the preset time t 0  in response to a vertical start signal of a left-eye image included in the first image data DD 1 . Similarly to the second shutter signal S 2 , the second enable signal BE may be substantially synchronized with the first image data DD 1  after the preset time t 0  in response to a vertical start signal of a right-eye image included in the first image data DD 1 . 
     According to exemplary embodiments, when a 3D image is displayed thereon, lights may not be provided to the display panel  110  during the preset time t 0  in response to a vertical start signal of the left-eye image and the right-eye image. The light source module  400  may be driven in a dimming driving method in accordance with an image data corresponding to the plurality of display blocks, e.g., the first to sixth display blocks DB 1 , DB 2 , DB 3 , DB 4 , DB 5  and DB 6 , and the left-eye image and the right-eye image, between which the black image is inserted, may be sequentially displayed thereon. Thus, although the black image is not completely realized on the display panel  110 , a crosstalk generated due to a slow response of liquid crystal molecules is effectively prevented. 
     According to exemplary embodiments, the duty control signal converting part  457 , included in a light source module in a one-dimensional dimming mode, receives the first to k-th top duty control signals PWM 1  to PWMk in parallel, so that a logic part for a serial communication may be omitted. Thus, a circuit structure of the light source module may be simplified, and a blinking operation that reduces a crosstalk of a shutter type 3D image is realized without additional costs, so that manufacturing costs of the display apparatus may be effectively reduced. 
     According to exemplary embodiments of the present invention as described above, a first light-emitting module and a second light-emitting modules including edge type LEDs are driven using first to k-th top duty control signals, applied to a display apparatus in parallel, so that the display apparatus may be driven in a dimming driving mode. Thus, the display apparatus may display a 3D image with substantially reduced crosstalk, so that a display quality of the display apparatus is substantially improved and manufacturing costs of the display apparatus is substantially reduced. 
     The foregoing is illustrative of the present invention and is not to be construed as limiting thereof. Although a few exemplary embodiments of the present invention have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of the present invention. Accordingly, all such modifications are intended to be included within the scope of the present invention as defined in the claims. In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Therefore, it is to be understood that the foregoing is illustrative of the present invention and is not to be construed as limited to the specific exemplary embodiments disclosed, and that modifications to the disclosed exemplary embodiments, as well as other exemplary embodiments, are intended to be included within the scope of the appended claims. The present invention is defined by the following claims, with equivalents of the claims to be included therein.