Abstract:
A display device capable of displaying a stereoscopic image has improved display quality when displaying a 2-D image by filtering to include image data from surrounding pixels in output data corresponding to a specific pixel based on weight values. The data of the specific pixel is influenced by the surrounding pixels, to display the data of the specific pixel in a wider range. As a result, non-recognition of a thin line or character at an arbitrary angle may be prevented.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims priority under 35 U.S.C. §119 from Korean Patent Application No. 10-2009-0102981 filed in the Korean Intellectual Property Office on Oct. 28, 2009, the entire contents of which are herein incorporated by reference in their entirety. 
       BACKGROUND OF THE INVENTION 
       [0002]    (a) Field of the Invention 
         [0003]    The present disclosure is directed to a stereoscopic image display device and a method of displaying a 2-D image in the stereoscopic image display device. 
         [0004]    (b) Description of the Related Art 
         [0005]    Fast communication services to be provided by the information superhighway are expected to evolve from simpler services for hearing and speaking, such as current telephone services, to audible and visible multimedia services utilizing digital terminals for quickly processing characters, voices, and images. Furthermore, 3-D communication services that enable realistic and stereoscopic viewing and hearing are eventually expected to be developed, overcoming current temporal and spatial limitations. 
         [0006]    Typically, a 3-D image is perceived by means of stereo vision of two eyes. Binocular disparity, i.e., a disparity caused by two eyes being separated by a distance of about 65 mm, plays a most important role in the stereoscopic effect. That is, when left and right eyes view different 2-D images and the two images are transmitted to the brain through the optic nerves, the brain combines the two images to construct a representation of the original 3-D image that includes depth. Such ability is usually called stereography. 
         [0007]    Schemes using binocular disparity for 3-D image displays are typically categorized, depending on a need for eyeglasses, as stereoscopic schemes, which include polarization schemes and time divisional schemes, and autostereoscopic schemes, which include parallax barrier schemes and lenticular schemes. 
         [0008]    In a stereoscopic scheme, people may perceive a 3-D image if polarization eyeglasses or liquid crystal shutter eyeglasses are worn. However, due to the drawback of wearing polarization or liquid crystal shutter eyeglasses, stereoscopic schemes are not typically used to perceive stereoscopic images, and are typically only used in movie theatres. 
         [0009]    In contrast, autostereoscopic schemes do not require additional eyeglasses to be worn when viewing a stereoscopic image. In particular, an autostereoscopic scheme using a lenticular lens has been found to provide the best combination of thickness and aperture ratio for a stereoscopic image display device. 
         [0010]    A display device using a lenticular lens may be relatively thin, and the display device need not be covered by the lenticular lens. However, use of a lenticular lens may deteriorate display quality of a 2-D image other than a stereoscopic image. That is, a 2-D image is refracted in the lenticular lens such that unrecognizable pixels are generated. Also, these unrecognizable pixels may display color different from the desired color, and thin lines or small characters may be spatially shifted in the display. 
       SUMMARY OF THE INVENTION 
       [0011]    Embodiments of the present invention may display a 2-D image in a stereoscopic image display device using a lenticular lens. 
         [0012]    A stereoscopic image display device according to an exemplary embodiment of the present invention includes: a display panel including pixels having subpixels representing at least three different colors and arranged in a matrix form; a lenticular lens formed on the display panel; a data driver applying a data voltage to the display panel; a signal controller controlling the data driver; and a converter that filters an image signal representing a 2-D image signal received from an external source to generate and transmit output data to the signal controller, wherein the lenticular lens has a semi-circular cylinder shape and is aligned to transmit light from at least one row pixel of the display panel. 
         [0013]    The lenticular lens may be aligned to transmit light from three row pixels of the display panel. 
         [0014]    The subpixels corresponding to one lenticular lens may include subpixels representing at least three different colors which form a column. 
         [0015]    The subpixels corresponding to one lenticular lens may be grouped in a same row or a same column to define a column pixel or a row pixel, and the column or the row may include a first pixel having a sequence of red, green, and blue subpixels, a second pixel having a sequence of green, blue, and red subpixels, and a third pixel having a sequence of blue, red, and green subpixels. 
         [0016]    The converter may include a line memory for storing the image signals for one row among the image signals, and a filtering unit for filtering the image signals stored in the line memory. 
         [0017]    The filtering uses a 3×3 square matrix of weight values, the filter is applied to image signals stored to the line memory being sequentially moved, and the output data may be generated by multiplying the corresponding image signal by the weight values and accumulating the multiplied values. 
         [0018]    The central weight value of the square matrix is the largest, and the surrounding weight values are the same, and the filtering may be processed for subpixels representing the same color. 
         [0019]    The central weight value of the square matrix is the largest, and the center top, center bottom, center right, and center left weight values are the same and are different from the weight values of the upper left corner, upper right corner, lower left corner, and lower right corner t that are the same, and the filtering may be processed for the subpixels representing the same color. 
         [0020]    The converter may be formed of a programmable IC chip. 
         [0021]    The filtering may include in the output data weighted according to their position relative to the specific pixel. 
         [0022]    The filter may process eight pixels surrounding the specific pixel. 
         [0023]    The filtering may process subpixels representing the same color in the specific pixel and the surrounding pixels. 
         [0024]    The converter may render-process image signals representing 3-D stereoscopic images received from an external source. 
         [0025]    A protecting substrate may be formed between the display panel and the lenticular lens and a protecting film may be formed at the surface of the lenticular lens. 
         [0026]    A method according to an exemplary embodiment of the present invention for displaying an image of a stereoscopic image display device that uses a lenticular lens includes: determining whether an input image signal received from an external source is an image signal representing a 2-D image or an image signal representing a stereoscopic image; filtering the input image signal to generate output data when the input image signal is an image signal representing a 2-D image; and outputting the output data to display an image, wherein the filtering i includes in the output data image signals corresponding to pixels surrounding a specific pixel weighted according to their position relative to the specific pixel. 
         [0027]    The filtering may process subpixels representing the same color in the specific pixel and the surrounding pixels. 
         [0028]    The sum of the weight values of the specific pixel and the surrounding pixels may be 1. 
         [0029]    The filtering processes eight pixels surrounding the specific pixel. 
         [0030]    When the input image signal is an image signal representing a stereoscopic image, the input image signal is rendered to generate the output data. 
         [0031]    A stereoscopic image display device according to another exemplary embodiment of the present invention includes: a display panel including pixels having subpixels representing at least three different colors and arranged in a matrix form; and a converter that filters an image signal representing a 2-D image signal received from an external source to generate output data and to transmit it to the signal controller, wherein the converter includes a line memory for storing the image signals for one row among the image signals, and a filtering unit for filtering the image signals stored in the line memory; and wherein the filtering uses a 3×3 square matrix of weight values and the filter is applied to image signals stored to the line memory while being sequentially moved, and the output data is generated by multiplying the corresponding image signal by the weight values of the square matrix and accumulating the multiplied values. 
         [0032]    The stereoscopic image display device according to another exemplary embodiment of the present invention also includes a lenticular lens disposed on the display panel, wherein the lenticular lens has a semi-circular cylinder shape and is aligned to transmit light from three rows of three pixels of the display panel, and subpixels corresponding to one lenticular lens are grouped in a same row or a same column to define a column pixel or a row pixel, and the column or the row includes a first pixel having a sequence of red, green, and blue subpixels, a second pixel having a sequence of green, blue, and red subpixels, and a third pixel having a sequence of blue, red, and green subpixels. 
         [0033]    A stereoscopic image display device according to an exemplary embodiment of the present invention that uses a lenticular lens, can display a recognizable 2-D image through a wider region at an arbitrary angle, so that a 2-D image may be recognized at any position in a stereoscopic image display device using the lenticular lens, improving the display quality of the 2-D image. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0034]      FIG. 1  is a cross-sectional view of a stereoscopic image display device according to an exemplary embodiment of the present invention. 
           [0035]      FIG. 2  is a view showing an arrangement of a lenticular lens and a pixel in a stereoscopic image display device according to an exemplary embodiment of the present invention. 
           [0036]      FIG. 3  is a block diagram of a stereoscopic image display device according to an exemplary embodiment of the present invention. 
           [0037]      FIG. 4  is a flowchart showing a method of processing image data in a stereoscopic image display device according to an exemplary embodiment of the present invention. 
           [0038]      FIG. 5  is a block diagram of a portion of the converter of  FIG. 3  in detail. 
           [0039]      FIG. 6  illustrates the display of a 2-D image in the method of  FIG. 4  in detail. 
           [0040]      FIG. 7  and  FIG. 8  depict examples of filters for processing a 2-D image according to other exemplary embodiments of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0041]    The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. 
         [0042]    In the drawings, like reference numerals designate like elements throughout the specification. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being “on” another element, it can be directly on the other element or intervening elements may also be present. 
         [0043]    Now, a structure of a stereoscopic image display device according to an exemplary embodiment of the present invention will be described with reference to  FIG. 1 . 
         [0044]      FIG. 1  is a cross-sectional view of a stereoscopic image display device according to an exemplary embodiment of the present invention. 
         [0045]    As shown in  FIG. 1 , a stereoscopic image display device includes a display panel  300  and a lenticular unit  400 , and light emitted from the display panel  300  is refracted while passing through a lenticular lens  410  such that its progressing direction is divided and is incident to two eyes to increase depth perception for the image, so that a stereoscopic image may be recognized in the stereoscopic display. Here, the light incident to the right eye and the light incident to the left eye carry different information so that a stereoscopic image may be perceived. 
         [0046]    Various display panels may be used for a stereoscopic image display device according to different exemplary embodiments of the invention. For example, a liquid crystal panel controlling alignment direction of liquid crystals to display an image, an organic light emitting panel using an organic light emitting diode to display an image, a plasma display panel using plasma to display an image, and an electrophoretic display panel, may be used.  FIG. 1  shows a representative liquid crystal panel  300  as an example. The liquid crystal panel  300 , being a non-emissive device, uses a backlight unit  200  located on the rear surface of the liquid crystal panel  300  to emit light for displaying the image. 
         [0047]      FIG. 1  schematically shows the display panel  300 . That is, a lower polarizer  12  is formed at the lower surface of the display panel  300 , a thin film transistor substrate  310  is formed thereon as a lower substrate, an upper substrate  320  facing thereto is formed, and a liquid crystal layer  330  is formed between the upper substrate  320  and the thin film transistor substrate  310 . Also, an upper polarizer  22  is formed outside the upper substrate  320 . 
         [0048]    The thin film transistor substrate  310  includes a pixel electrode (not shown) and a thin film transistor (not shown) connected thereto to control the liquid crystal, and the alignment direction of the liquid crystal  330  changes according to a voltage applied to the pixel electrode. 
         [0049]    On the other hand, according to an exemplary embodiment, the upper substrate  320  may include a black matrix, a color filter, and a common electrode, in which the black matrix covers a portion of the thin film transistor substrate  310  (for example the thin film transistor) that must be covered, and the common electrode along with the pixel electrode form an electric field. 
         [0050]    The color filter is generally classified into R (red), G (green), and B (blue) filters, and colors the light passing through the liquid crystal  330  to display color images. 
         [0051]    The display panel  300  changes the light emitted from the backlight unit  200  to have linear polarization in the lower polarizer  12 , changes the phase of the light passing through the liquid crystal layer  330 , and transmits the light having the same transmissive axis as that of the upper polarizer  22  to thereby display the image. 
         [0052]    The lenticular unit  400  attached to the display panel  300  through an adhesive is formed on the display panel  300 . 
         [0053]    The lenticular unit  400  includes a lenticular lens  410 , a protecting film  420  protecting the lenticular lens, and a protecting substrate  430  protecting the display panel  300 . 
         [0054]    The lenticular lens  410  is made of a material having an isotropic refractive index, and forms a semicircular cylinder attached at the upper surface of the protecting substrate  430 . One lenticular lens  410  may be formed for a predetermined number of pixels in the display panel  300  according to an exemplary embodiment, and this will be described with reference to  FIG. 2 . 
         [0055]    The light incident from the display panel  300  is refracted at the surface of the lenticular lens and progresses toward the left and right eyes so that a stereoscopic image may be perceived, however there is an effect that a 2-D image is also refracted. According to an embodiment of the present invention, for a 2-D image, a portion of the image displayed in each pixel is displayed at a peripheral pixel through filtering. This will be described later through  FIG. 3  to  FIG. 8 . 
         [0056]    First, an arrangement between the lenticular lens  410  and a pixel of the display panel  300  will be described with reference to  FIG. 2 . 
         [0057]      FIG. 2  is a view showing an arrangement relationship of a lenticular lens and a pixel in a stereoscopic image display device according to an exemplary embodiment of the present invention. 
         [0058]    In an exemplary embodiment of the present invention, one lenticular lens  410  is formed per nine subpixels, which is three pixels. The subpixel is a unit representing either red, green, or blue, and a pixel is a combination of three subpixels representing red, green, and blue. A position where the distance between the lenticular lens  410  and the protecting substrate  430  is shortest or where they contact each other, hereinafter referred to as an edge of the lenticular lens  410 , is aligned to one side of a subpixel (or a pixel). According to an exemplary embodiment, the edge of the lenticular lens  410  may be aligned to a central position between the subpixels. 
         [0059]    As shown in  FIG. 2 , in the display panel  300  according to an exemplary embodiment of the present invention, three adjacent subpixels in one row may be regarded as one pixel, hereinafter referred to as a row pixel (Pr), including red, green, and blue, and three adjacent subpixels in one column may also be regarded as one pixel, hereinafter referred to as a column pixel (Pc), having red, green, and blue. Hereafter, this arrangement is referred to as a mosaic arrangement.  FIG. 2  shows only three rows, however the same arrangement is repeated in subsequent rows. 
         [0060]    Row pixel (Pr) light is refracted and transmitted to different positions due to the lenticular lens when displaying the stereoscopic image such that the subpixel light is not grouped and recognized as one pixel. In comparison, the column pixel Pc light is refracted and transmitted in the same direction in the lenticular lens such that the subpixel light is grouped and recognized as one pixel. 
         [0061]    In comparison, image information is input individually with respect to the row pixels Pr when displaying the 2-D image in the display panel  300 , and the subpixel light is generally grouped and recognized as one pixel. 
         [0062]    Therefore, in a present exemplary embodiment, the relationship of the column pixels Pc is more important when displaying a stereoscopic image, and the relationship of the row pixels Pr is more important when displaying a 2-D image. 
         [0063]    In an exemplary embodiment of the present invention, the mosaic arrangement includes the column pixels Pc in which pixels refracted in the same direction are grouped to represent one color when displaying a stereoscopic image, to eliminate the effect of one color being recognized according to the position of the eye, thereby improving the display quality of the stereoscopic image. 
         [0064]    However, even though the pixels have a mosaic arrangement, a 2-D image is refracted through the lenticular lens  410  and perceived with decreased visibility of thin lines or small characters. 
         [0065]    To substantially reduce this effect, according to an embodiment of the present invention, when displaying a 2-D image, data applied to each subpixel is filtered by using data of surrounding subpixels. 
         [0066]    In another exemplary embodiment of the present invention, one lenticular lens  410  is formed for a total of twelve subpixels. Here, a subpixel is a unit representing either red, green, blue, or white, and a pixel is a combination of four subpixels representing red, green, blue, and white. That is, one lenticular lens  410  is formed for a total of twelve subpixels, corresponding to four pixels. A present exemplary embodiment for the case in which one lenticular lens  410  is formed for nine subpixels (three pixels) as described in the exemplary embodiment of  FIG. 2 , is essentially the same as the case in which one lenticular lens  410  is formed for twelve subpixels (four pixels), such that a detailed description of an exemplary embodiment for twelve subpixels is omitted. 
         [0067]    Next, the filtering of 2-D image data will be described with reference to  FIG. 3  to  FIG. 8 . 
         [0068]    First, the structure of a stereoscopic image display device according to an exemplary embodiment of the present invention will be described with reference to the circuit shown in  FIG. 3 . 
         [0069]      FIG. 3  is a block diagram of a stereoscopic image display device according to an exemplary embodiment of the present invention. 
         [0070]    As shown in  FIG. 3 , a stereoscopic image display device according to an exemplary embodiment of the present invention includes a display panel  300 , a scan driver  400 , a data driver  500 , a signal controller  600 , and a converter  700 . A lenticular unit  400  is formed on the display panel  300  of  FIG. 3 , however  FIG. 3  is a simple block diagram such that the structure of the lenticular lens is not shown. 
         [0071]    The display panel  300  includes gate lines (not shown) transmitting a scanning signal, data lines (not shown) transmitting a data voltage, and a plurality of pixels PX connected thereto and arranged in an approximate matrix form. Each pixel PX of  FIG. 3  includes three subpixels (red, green, and blue subpixels), as in  FIG. 2 . Alternatively, each pixel PX of  FIG. 3  may include four subpixels (red, green, blue, and white subpixels). 
         [0072]    The gate lines extend substantially in a row direction parallel to each other, and the data lines extend substantially in a column direction parallel to each other. 
         [0073]    Each subpixel included in one pixel PX includes a thin film transistor connected to a gate line and a data line, a pixel electrode connected to a thin film transistor, a common electrode facing the pixel electrode, and a liquid crystal layer disposed between the pixel electrode and the common electrode. 
         [0074]    The scan driver  400  is connected to the gate lines of the display panel  300 , and applies a gate voltage made of a combination of a gate-on voltage Von and a gate-off voltage Voff to the gate lines. 
         [0075]    The data driver  500  is connected to the data line of the display panel  300 , and applies the data voltage representing an image signal to the data lines. Here, the image signal may be either a stereoscopic image signal to display a stereoscopic image or a plane image signal to display a 2-D image. 
         [0076]    The signal controller  600  controls the operation of the scan driver  400  and the data driver  500  via the CONT 1  and CONT 2  signals, respectively, and processes an input image signal Din to transmit an output image signal Dout to the data driver  500 . 
         [0077]    The input image signal Din input to the signal controller  600  is an output signal of the converter  700 , and the converter  700  processes the image signal (video signal) received from an external device as in  FIG. 4  and transmits the processed signal to the signal controller  600 . 
         [0078]    Hereinafter, processing of the image signal input from the external device according to an exemplary embodiment of the present invention will be described with reference to  FIG. 4 . 
         [0079]      FIG. 4  is a flowchart showing a method of processing image data of a stereoscopic image display device according to an exemplary embodiment of the present invention. 
         [0080]    First, it is determined whether the image signal (the video signal) input received from an external source is a signal to display a stereoscopic image, hereinafter referred to as a 3-D image signal, or a signal to display a 2-D image, hereinafter referred to as a 2-D image signal (S 10 ). 
         [0081]    Generally, the 3-D image signal includes data for depth in addition to the 2-D image signal. That is, the 3-D image signal has depth data added to the 2-D image for the image to be recognized as a stereoscopic image, and if there is depth data, the data is render-processed to generate 3-D data as stereoscopic image data (S 22 ) that is then transmitted to the signal controller  600  (S 32 ). 
         [0082]    On the other hand, if there is no depth data, a 2-D image is displayed, and the input image signal (the video signal) is filter-processed (S 21 ) to generate 2-D data as 2-D image data that is then transmitted to the signal controller  600  (S 31 ). 
         [0083]    First, referring to S 10 , the 3-D image signal and the 2-D image signal are distinguished with reference to the existence of the depth data, however they may be distinguished with reference to different data in other exemplary embodiments. 
         [0084]    A case in which the image signal is determined to be a 3-D image signal in the first step (S 10 ) will be described first. 
         [0085]    If a 3-D image signal is recognized, the depth data added to the 2-D image signal must be processed. Various processing methods may be used, but in a present exemplary, non-limiting, embodiment, the depth data is render-processed (S 22 ) to generate the 3-D data. 
         [0086]    During render-processing (S 22 ), a plurality of identical screens are displayed to be recognized as stereoscopic. As one example, when displaying a stereoscopic image in a display panel having a resolution of 1920×1080, the stereoscopic perception is provided through a method in which nine overlaps of a 640×360 screen are displayed. That is, nine pixels shown in  FIG. 2  all display the same data, and nine subpixels representing red among twenty-seven subpixels all display the same data, nine subpixels representing blue all display the same data, and nine subpixels representing green all display the same data. Through this display, all 1920×1080 pixels may be supplied with data, and stereoscopic perception may be realized when the image signal is transmitted in different directions to the eyes due to the lenticular lens  410 . Here, one pixel is recognized from column pixels Pc, shown in  FIG. 2 , that are refracted in the same direction. 
         [0087]    In a present exemplary embodiment, the render-processed data is output to the signal controller  600  as 3-D data (S 32 ). 
         [0088]    A case in which the image signal is determined to be a 2-D image signal in the step S 10  will now be described. 
         [0089]    If a 2-D image signal is recognized, the input image video signal is filtered (S 21 ) and output to the signal controller  600 , and this is described with reference to  FIG. 5  and  FIG. 6 . 
         [0090]      FIG. 5  is a block diagram of a portion of a converter of  FIG. 3  in detail, and  FIG. 6  illustrates the display of a 2-D image in a method of  FIG. 4  in detail. 
         [0091]    First, a block diagram of the converter  700  will be described with reference to  FIG. 5 .  FIG. 5  shows a converter  700  configured for filtering the 2-D image signal, which includes a line memory  710  and a filtering unit  750 . Therefore, when recognizing the signal as a 3-D image signal, the data may be processed through a structure different from that of  FIG. 5 , with the filtering unit  750  determining the signal to be a 3-D image signal (S 10 ) and render-processing (S 22 ) the 3-D image signal. 
         [0092]    As shown in  FIG. 5 , an image video signal received from an external device is input to the line memory  710 . The size of the line memory  710  is sufficient to store data for displaying at least one row of an image of the display panel  300 . 
         [0093]    On the other hand, as shown in an exemplary embodiment of  FIG. 6 , the line memory  710  may include first to third line memories  711 ,  712 , and  713 . In an exemplary embodiment of  FIG. 6 , the data is stored as follows. 
         [0094]    First, the image video signal is received and stored to the first line memory  711 . The size of the first line memory  712  is sufficient to store the data for displaying one row image of the display panel  300 , and the size of the second and third line memories  712  and  713  is the same. However, the size of each of the line memories  711 ,  712 , and  713  may vary according to other embodiments of the invention. 
         [0095]    After data to display one row of the input image video signal is stored to the first line memory  711 , the data stored to the first line memory  711  is moved to the second line memory  712 , and the next data is stored to the first line memory  711 . Again, if data for displaying one row is stored to the first line memory  711 , the data stored to the first line memory  711  and the second line memory  712  are respectively moved to the second line memory  712  and the third line memory  713 . The next data is again stored to the first line memory  711 . The data that was stored to the third line memory  713  is overwritten and erased when the data stored to the second line memory  712  is moved thereto. 
         [0096]    In this way, the data stored to the first to third line memories  711 ,  712 , and  713  is transmitted to the filtering unit  750  to be filter-processed (S 21 ). 
         [0097]    Filter-processing uses eight subpixels having the same color and that enclose the remaining one subpixel in the corresponding central pixel, as shown in  FIG. 6 . 
         [0098]    As shown in  FIG. 6 , if the image video signal for a 2-D image is received, the data is sequentially stored to the first to third line memories  711 ,  712 , and  713 . Referring to section B, the stored data is filter-processed using a 3×3 filter A after a predetermined time ( 1 H in  FIG. 6 ) with respect to the overlapped region X, and the result thereof is output, shown in section C. 
         [0099]    That is, the input data of three rows sequentially overlap the filter A, shown as the region X, and are calculated as shown in section B, and then the result thereof is determined and output as the data value C positioned at the central portion of the overlapped region (the region X). 
         [0100]    The data calculation method described for section B is to respectively multiply the corresponding numbers and accumulate them in the region X overlapping the filter A. That is, the multiplication of the values is started at the left upper sides with 128× 1/16 in the 3×3 filter A and the 3×3 region X, and is continued by row from the left to the right with 121× 1/16, 130× 1/16, 111× 1/16, 10×½, 130× 1/16, 122× 1/16, 12× 1/16, and 174× 1/16. The value 63 is the sum of the products, and is output as a value corresponding to the data value of 10 positioned at the central part of the region X, shown in section C. 
         [0101]    Next, the region X is moved by one column and the data are again filtered through the calculating method. 
         [0102]    On the other hand, a case where there is no corresponding data in the region X overlapping the filter A may be generated. That is, when there is no corresponding data for filtering the top/bottom/left/right outer portions of the display panel  300 , the corresponding output data is 0. 
         [0103]    The converter  700  shown in  FIG. 5  may be configured on a programmable IC chip that supports addition and the subtraction, and in which multiplication and the division may be implemented by further bit data processing. For example, in the case of an 8-bit data word, the multiplication result may be obtained by using the upper 7 bits to multiply by ½, the upper 4 bits to multiply by 1/16, and the upper 5 bits to multiply by ⅛, to obtain the multiplication result. An additional calculator is not necessary to obtain the result that may be otherwise be obtained by appropriately adding or subtracting. 
         [0104]    Each data of the region X shown in  FIG. 6  is data corresponding to one color among red, green, and blue. That is, the data stored to the line memories  711 ,  712  and  713  are classified and divided into data of each color, the data of each color is arranged as shown in  FIG. 6 , and the arranged data overlaps the filter A for filtering. 
         [0105]    Next, if the output data for each color is determined, the output data is output like the arrangement of the subpixels of  FIG. 2 . The converter  700  arranges the data, which may be processed by the signal controller  600 . 
         [0106]    As described above, if filtering is executed using the filter A, the data of the corresponding subpixel (or the corresponding pixel) is influenced by the surrounding subpixels (or pixels) as illustrated in the calculation B. As a result, the number of pixels displaying a thin longitudinal line or small character may be increased such that a region refracted through the lens is widened to be more easily perceived. 
         [0107]      FIG. 6  shows an example of filter-processing. As shown in  FIG. 6 , the filter A uses half of the data value corresponding to a specific pixel, and 1/16 of the data values corresponding to the eight surrounding pixels. 
         [0108]    However, a filter of a different structure from the filter A of  FIG. 6  may be included according to other exemplary embodiments. In one exemplary embodiment, the nine weight values in a 3×3 filter may have values different from each other. On the other hand, in another exemplary embodiment, the 3×3 filter may have a symmetrical structure such as that described with reference to  FIG. 7  and  FIG. 8 . 
         [0109]      FIG. 7  and  FIG. 8  depict examples of filters for processing a 2-D image according to other exemplary embodiments of the present invention. 
         [0110]    A filter of an exemplary embodiment of  FIG. 7  has the same structure as the filter A of  FIG. 6 . That is, the weight value of the central part is different from that of  FIG. 6 , and the surrounding eight weight values are the same. Like the filter A of  FIG. 6 , the value α may be larger than the value β. 
         [0111]    On the other hand, in  FIG. 8 , the center top, center bottom, center left, and center right weight values are the same, the central weight value β is unique, and the remaining weight values γ in the corners are the same. Here, according to exemplary embodiments, the value α may be larger than the value β and the value β may be smaller than the value γ. 
         [0112]    The sum of the weight values of  FIG. 7  and  FIG. 8  according to a present exemplary embodiment is 1. Other exemplary embodiments having various weight values different from  FIG. 7  and  FIG. 8  may be provided. 
         [0113]    According to another embodiment of the invention, a method may be used in which a YCbCr color space is used when processing the image data. In this method, the data is processed with reference to Y representing the luminance and Cb and Cr representing the chrominance. The filtering described in  FIG. 6  may executed as for red, green, and blue in the RGB color space. That is, processing the data in the YCbCr color space does not require the data conversion into the RGB color space, which improves processing speed and processing performance. 
         [0114]    While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.