Abstract:
A display device includes a first display region, a second display region, a first lens, and a second lens. The first display region includes a first pixel subset and may display a first image. The first image includes a first sub-image corresponding to the first pixel subset and smaller than the first image. The second display region neighbors the first display region, includes a second pixel subset, and may display a second image. The second image includes a second sub-image corresponding to the second pixel subset and smaller than the second image. The second pixel subset is not identical to the first pixel subset. The first lens may show the first sub-image without providing the entire first image. The second lens may show the second sub-image without providing the entire second image when the first lens shows the first sub-image.

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
       [0001]    This application claims priority under 35 USC §119 to Korean Patent Application No. 10-2016-0086287, filed on Jul. 7, 2016 in the Korean Intellectual Property Office (KIPO); the contents of the Korean Patent Application are incorporated herein by reference. 
       BACKGROUND 
     1. Technical Field 
       [0002]    The technical field is related to a display device, such as a head mounted display device, and a method of operating the display device. 
       2. Description of the Related Art 
       [0003]    A head mounted display device (HMD) may be mounted on a head of a user, may enlarge an image using a lens, and may provide the image to one or two eyes of the user. 
         [0004]    The lens may cause a screen door effect or an artifact in the displayed image to be conspicuous to the user. As a result, the perceived quality of the image may be unsatisfactory. 
       SUMMARY 
       [0005]    Embodiments may be related to a display device that may display images with minimum or substantially no visible or conspicuous artifacts. 
         [0006]    According to example embodiments, a display device may include the following elements: a display panel including a first displaying region and a second displaying region corresponding to the first displaying region; a timing controller configured to generate converted data by changing orders of line data included in second image data corresponding to the second displaying region; and a data driver configured to generate data signals based on the converted data and to provide the data signals to the display panel. 
         [0007]    In example embodiments, the first displaying region may correspond to a left eye of a user, and the second displaying region may correspond to a right eye of the user. 
         [0008]    In example embodiments, the timing controller may generate the converted data by maintaining orders of line data included in the first image data corresponding to the first displaying region. 
         [0009]    In example embodiments, the second displaying region may include first type pixel columns and second type pixel columns arranged alternately, and the timing controller may generate the converted data by shifting first line data corresponding to the first type pixel columns in a first direction. 
         [0010]    In example embodiments, the first type pixel columns may include a first pixel emitting a light with a first color, and the second type pixel columns may include a second pixel emitting a light with a second color. 
         [0011]    In example embodiments, the first type pixel columns may further include a third pixel emitting a light with a third color. 
         [0012]    In example embodiments, the timing controller may map a kth line data corresponding to a kth pixel column to a k+1th pixel column adjacent to the kth pixel column, where k is a positive integer, and the kth pixel column and the k+1th pixel column are included in the first type pixel columns. 
         [0013]    In example embodiments, the timing controller may map a kth line data corresponding to a kth pixel column to a k−1th pixel column adjacent to the kth pixel column, where k is a positive integer, and the kth pixel column and the k−1th pixel column are included in the first type pixel columns. 
         [0014]    In example embodiments, the display panel may include pixels arranged in Pentile format, and the timing controller may generate the converted data by applying a second sub-pixel rendering filter to the second image data. 
         [0015]    In example embodiments, the second image data may include first sub-data and second sub-data, and the timing controller may apply the second sub-pixel rendering filter to the first sub-data. 
         [0016]    In example embodiments, the second sub-pixel rendering filter may have weights for a first adjacent pixel and a second adjacent pixel, where the first adjacent pixel is adjacent to a target pixel, and the second adjacent pixel is adjacent to the first adjacent pixel. 
         [0017]    In example embodiments, the timing controller may generate the converted data by applying a first sub-pixel rendering filter to first image data corresponding to the first displaying region, where the first sub-pixel rendering filter is different from the second sub-pixel rendering filter. 
         [0018]    In example embodiments, the first sub-pixel rendering filter may have weights for a target pixel and a first adjacent pixel, where the first adjacent pixel is adjacent to the target pixel. 
         [0019]    In example embodiments, the display panel may include pixels arranged in Pentile format, and the timing controller may generate the converted data by applying a third sub-pixel rendering filter to the second image data. 
         [0020]    In example embodiments, the second image data may include first sub-data and second sub-data, and the timing controller may apply the third sub-pixel rendering filter to the second sub-data. 
         [0021]    In example embodiments, the third sub-pixel rendering filter may have a weight for a third adjacent pixel, where the third adjacent pixel is adjacent to a target pixel. 
         [0022]    According to example embodiments, a display device may include the following elements: a first display panel having a first pixel arrangement; a second display panel corresponding to the first display panel and having a second pixel arrangement; a timing controller configured to generate first converted data corresponding to the first display panel based on stereoscopic image data and to generate second converted data corresponding to the second display panel based on the stereoscopic image data; and a data driver configured to generate data signals based on the first converted data and the second converted data and to provide the data signals to the first display panel and the second display panel. 
         [0023]    In example embodiments, the second pixel arrangement may be opposite to the first pixel arrangement. 
         [0024]    According to example embodiments, a display device may include the following elements: a display panel including a first displaying region and a second displaying region corresponding to the first displaying region; and a data driver configured to generate second line data signals based on the second line data included in second image data corresponding to the second displaying region and to provide the second line data to the display panel by changing orders of the second line data. 
         [0025]    In example embodiments, the data driver may shift at least a portion of the second line data in a first direction. 
         [0026]    Example embodiments may be related to a display device, e.g., a head-mounted display device. The display device may include a first display region, a second display region, a first lens, and a second lens. The first display region may include a first pixel subset and may display a first image. The first image may include a first sub-image. The first sub-image may correspond to the first pixel subset and may be smaller than the first image. The second display region may neighbor the first display region, may include a second pixel subset, and may display a second image. The second image may include a second sub-image. The second sub-image may correspond to the second pixel subset and may be smaller than the second image. The second pixel subset may not be identical to the first pixel subset. The first lens may overlap the first display region and may show (and/or provide) the first sub-image without showing all of the first image (i.e., without showing the entire first image). The second lens may overlap the second display region and may show (and/or provide) the second sub-image without showing all of the second image (i.e., without showing the entire second image) when the first lens shows the first sub-image. 
         [0027]    The display device may include a controller. The controller may receive a first data set and a second data set, may produce a converted data set by changing pixel-mapping for the second data set, and may output the first data set and the converted data set. The first display region may display the first sub-image according to the first data set. The second display region may display the second sub-image according to the converted data set. 
         [0028]    The display device may include a controller. The controller may include a first filter and a second filter, may receive a first data set and a second data set, may produce a first filtered data set by applying the first filter to the first data set, may produce a second filtered data set by applying the second filter to the second data set, and may output the first filtered data set and the second filtered data set. A quantity of weight parameters in the second filter may be greater than a quantity of weight parameters in the first filter. The first display region may display the first sub-image according to the first filtered data set. The second display region may display the second sub-image according to the second filtered data set. 
         [0029]    The first filter may include a first weight parameter and a second weight parameter. The first weight parameter may correspond to a first-region target pixel in the first display region. The second weight parameter may correspond to a first-region neighboring pixel in the first display region. The first-region neighboring pixel may immediately neighbor the first-region target pixel. The second filter may include a third weight parameter. The third weight parameter may correspond to a second-region target pixel in the second display region and may be equal to the second weight parameter. 
         [0030]    The second filter may include a fourth weight parameter. The fourth weight parameter may correspond to a second-region neighboring pixel in the second display region and may be equal to the first weight parameter. The second-region neighboring pixel may immediately neighbor the second-region target pixel. 
         [0031]    The first-region neighboring pixel may be positioned at a right side of the first-region target pixel. The second-region neighboring pixel may be positioned at a left side of the second-region target pixel. 
         [0032]    Each of the first weight parameter and the fourth weight parameter may be equal to ½. Each of the second weight parameter and the third weight parameter may be equal to 0. 
         [0033]    A first leftmost pixel column of the second pixel subset may be identical to a second leftmost pixel column of the first pixel subset and may not be identical to a first leftmost pixel column of the first pixel subset. 
         [0034]    A first rightmost pixel column of the first pixel subset may be identical to a second rightmost pixel column of the second pixel subset and may not be identical to a first rightmost pixel column of the second pixel subset. 
         [0035]    A first leftmost pixel column of the first pixel subset may include a first first-color pixel without including any second-color pixel. A first leftmost pixel column of the second pixel subset may include a first second-color pixel without including any first-color pixel. 
         [0036]    The first leftmost pixel column of the first pixel subset may include a third-color pixel. The first leftmost pixel column of the second pixel subset may include no third-color pixel. 
         [0037]    A first rightmost pixel column of the first pixel subset may include a second second-color pixel without including any first-color pixel. A first rightmost pixel column of the second pixel subset may include a second first-color pixel without including any second-color pixel. 
         [0038]    The first rightmost pixel column of the first pixel subset may include no third-color pixel. The first rightmost pixel column of the second pixel subset may include a third-color pixel. 
         [0039]    The first display region may include a first pixel set without including any other pixels. The first pixel set may include the first pixel subset. The second display region may include a second pixel set without including any other pixels. The second pixel set may include the second pixel subset. The first pixel set may be identical to the second pixel set. 
         [0040]    A distance between a first leftmost pixel column of the first pixel set and a first leftmost pixel column of the first pixel subset may be unequal to a distance between a first leftmost pixel column of the second pixel set and a first leftmost pixel column of the second pixel subset. 
         [0041]    A distance between a first leftmost pixel column of the first pixel set and a first leftmost pixel column of the first pixel subset may be greater than a distance between a first leftmost pixel column of the second pixel set and a first leftmost pixel column of the second pixel subset by at least a width of a pixel column in the display device. 
         [0042]    A distance between a first leftmost pixel column of the first pixel set and a first leftmost pixel column of the first pixel subset may be greater than a distance between a first leftmost pixel column of the second pixel set and a first leftmost pixel column of the second pixel subset by a width of a pixel column in the display device. 
         [0043]    The first display region may include a first pixel set without including any other pixels. The first pixel set may include the first pixel subset. The second display region may include a second pixel set without including any other pixels. The second pixel set may include the second pixel subset. The first pixel set may not be identical to the second pixel set. 
         [0044]    A first leftmost pixel column of the second pixel set may be identical to a second leftmost pixel column of the first pixel set and may be not identical to a first leftmost pixel column of the first pixel set. 
         [0045]    Example embodiments may be related to a method of operating a display device. The display device may include a first display region, a second display region, a first lens, and a second lens. The method may include displaying a first image using a first display region. The first display region may include a first pixel subset. The first image may include a first sub-image. The first sub-image may correspond to the first pixel subset and may be smaller than the first image. The method may include displaying a second image using a second display region. The second display region neighbors the first display region and may include a second pixel subset. The second image may include a second sub-image. The second sub-image may correspond to the second pixel subset and may be smaller than the second image. The second pixel subset may not be identical to the first pixel subset. The method may include providing (and/or showing) the first sub-image through the first lens without providing all of the first image (i.e., without providing the entire first image) through the first lens. The first lens may overlap the first display region. The method may include providing (and/or showing) the second sub-image through the second lens without providing all of the second image (i.e., without providing the entire second image) through the second lens when providing the first sub-image through the first lens. The second lens may overlap the second display region. 
         [0046]    A display device according to one or more embodiments may substantially prevent or mitigate visible or conspicuous artifacts in displayed images. Advantageously, quality of the displayed images may be satisfactory. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0047]      FIG. 1  is a diagram illustrating a head mounted display device according to example embodiments. 
           [0048]      FIG. 2  is a block diagram illustrating a display device included in the head mounted display device of  FIG. 1  according to embodiments. 
           [0049]      FIG. 3A  is a diagram illustrating a display panel set included in the head mounted display device of  FIG. 1  according to embodiments. 
           [0050]      FIG. 3B  is a diagram illustrating a display panel set included in the head mounted display device of  FIG. 1  according to embodiments. 
           [0051]      FIG. 4A  and  FIG. 4B  are diagrams illustrating images displayed by a display panel set according to embodiments. 
           [0052]      FIG. 4C  and  FIG. 4D  are diagrams illustrating images displayed by a display panel set according to embodiments. 
           [0053]      FIG. 5A  is a block diagram illustrating a timing controller included in the head mount display device of  FIG. 1  according to embodiments. 
           [0054]      FIG. 5B  is a diagram illustrating a sub-pixel (or sub-pixel) rendering filter used by the timing controller of  FIG. 5A  according to embodiments. 
           [0055]      FIG. 5C  is a diagram illustrating converted data processed and/or provided by the sub-pixel rendering filter of  FIG. 5B  according to embodiments 
           [0056]      FIG. 6A  is a diagram illustrating images displayed by a display panel set according to embodiments. 
           [0057]      FIG. 6B  is a diagram illustrating a sub-pixel rendering filter used by the timing controller of  FIG. 5A  according to embodiments. 
           [0058]      FIG. 6C  is a diagram illustrating converted data processed and/or provided by the sub-pixel rendering filter of  FIG. 6B  according to embodiments. 
           [0059]      FIG. 7  is a diagram illustrating a display panel set according to embodiments. 
           [0060]      FIG. 8  is a diagram illustrating a display panel set according to embodiments. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0061]    Embodiments are described with reference to the accompanying drawings. Although the terms “first”, “second”, etc. may be used herein to describe various elements, these elements, should not be limited by these terms. These terms may be used to distinguish one element from another element. Thus, a first element discussed below may be termed a second element without departing from teachings of one or more embodiments. The description of an element as a “first” element may not require or imply the presence of a second element or other elements. The terms “first”, “second”, etc. may also be used herein to differentiate different categories or sets of elements. For conciseness, the terms “first”, “second”, etc. may represent “first-category (or first-set)”, “second-category (or second-set)”, etc., respectively. In this application, “head mounted” may mean “head-mounted”; “sub-pixel” may mean “sub-pixel”; “panel” may mean “panel set”; “data” may mean “data set”; “sub-data” may mean “data subset”; “sub-converted data” may mean “converted data subset”; “connect” may mean “electrically connect”; “displaying region” may mean “display region”; “first type” may mean “first-type”; “same” may mean “identical”; “the same as” may mean “identical to”. 
         [0062]      FIG. 1  is a diagram illustrating a head mounted display device according to example embodiments. 
         [0063]    Referring to  FIG. 1 , the head mounted display device  10  (or head mounted display system) may include a display device  100  and lenses  20 . The head mounted display device  10  may be mounted on a head of a user and may further include a frame (or a case) to support the display device  100  and/or the lenses  20 . The lenses  20  may be spaced from the display device  100  by a specified distance. 
         [0064]    The display device  100  may include a first display region and a second display region. The first display region may display a left image. The second display region may display a right image. The lenses  20  may provide the eyes of the user with one or more images display by the display device  100  when the head mounted display device  100  is mounted on the user. For example, the lenses  20  may be eyepieces (or ocular eye pieces). The lenses  20  may include a left lens and a right lens. The left lens may overlap the first display region and may provide a left sub-image (i.e., part of the left image) to the left eye of the user. The right lens may overlap the second display region and may provide a right sub-image (i.e., part of the right image) to the right eye of the user. 
         [0065]    The head mounted display device  10  may further include one or more of other lenses, a reflector, and optical elements for forming and adjusting one or more optical paths such that images displayed by the display device  100  may be optimally provided to the eyes of the user. 
         [0066]      FIG. 2  is a block diagram illustrating a display device included in the head mounted display device of  FIG. 1  according to embodiments.  FIG. 3A  is a diagram illustrating a display panel set included in the head mounted display device of  FIG. 1  according to embodiments. 
         [0067]    Referring to  FIG. 2 , the display device  100  may include a display panel set  210 , a scan driver  220 , a data driver  230 , a timing controller  240 , and a power supply  250 . The display device  100  may display an image based on input image data (e.g., first data DATA 1 ) provided from an external component (e.g., a graphics card). For example, the display device  100  may be an organic light emitting display device. The input image data may be a 3-dimension (or 3D) image data. For example, the input image data may include left image data and right image data for providing different images to the eyes of the user. 
         [0068]    The display panel set  210  may include scan lines S 1 , S 2 , through Sn; data lines D 1 , D 2 , through D 2   m ; and pixels PX, where each of n and m is an integer greater than or equal to 2. The pixels PX may be located in/near intersections of the scan lines S 1  through Sn and the data lines D 1  through D 2   m . A pixel PX may store a data signal (e.g., a data signal provided through one of the data lines D 1  through D 2   m ) in response to a scan signal (e.g., a scan signal provided through one of the scan lines S 1  through Sn) and may emit a light based on the stored data signal. The display panel set  210  may be implemented as a display panel set  310  discussed with reference to  FIG. 3A  or a display panel set  320  discussed with reference to  FIG. 3B . 
         [0069]    Referring to  FIG. 3A , the display panel set  310  may include a first displaying region R 1  and a second displaying region R 2 . The first displaying region R 1  may display a first image (e.g., a left image) for one of the eyes of the user (e.g., for a left eye of the user), and the second displaying region R 2  may display a second image (e.g., a right image) for the other of the eyes of the user (e.g., for a right eye of the user). For example, the first displaying region R 1  may include a first pixel column through an mth pixel column, and the second displaying region R 2  may include an m+1th pixel column through a 2mth pixel column. 
         [0070]    The input image data may include valid values corresponding to a third displaying region R 3  and a fourth displaying region R 4 . In embodiments, the first image (e.g., a left image) may be displayed on the third displaying region R 3  and provided (and/or shown) through the left lens to the left eye of the user, and the second image (e.g., a right image) may be displayed on the fourth displaying region R 4  and provided (and/or shown) through the right lens to the right eye of the user. Because images displayed by the display device  100  may be distorted by the lenses  20 , the input image data may include the valid values corresponding to the third and fourth displaying regions R 3  and R 4  and may include an invalid value (e.g., a black data value, 0) corresponding to the display panel set  310  but outside the third and fourth displaying regions R 3  and R 4 . 
         [0071]    In some example embodiments, the third displaying region R 3  may correspond to a j+1th column through a j+kth pixel column, and the fourth displaying region R 4  may correspond to an m+j+2th pixel column through an m+j+k+1th pixel column. The fourth displaying region R 4  may be shifted by one pixel column (in addition to the m columns) in a row direction compared with the third displaying region R 3 . In embodiments, the second image (e.g., the right image) may be displayed while being shifted with one pixel column in the row direction compared with the first image (e.g., the left image). Related operation and effects will be further described with reference to  FIGS. 4A through 4D . 
         [0072]    In some example embodiments, the display panel set  210  may include display panels which are independent from each other. Referring to  FIG. 3B , the display panel set  201  may be implemented as the display panel set  320 , which may include a first display panel  311  and a second display panel  312 . The first display panel  311  may be substantially analogous to the first displaying region R 1  illustrated in  FIG. 3A , and the second display panel  312  may be substantially analogous to the second displaying region R 2  illustrated in  FIG. 3A . In embodiments, the display device  100  may include two display panels (e.g., the first and second display panels  311  and  312 ) instead of one display panel (e.g., the display panel  210 ) and may drive the display panels (e.g., the first and second display panels  311  and  312 ) independently from each other. 
         [0073]    Referring again to  FIG. 2 , the scan driver  220  may generate scan signals based on a scan driving control signal SCS. The scan driving control signal SCS may include a start signal (or a start pulse) and clock signals, and the scan driver  220  may include shift registers sequentially generating scan signals based on the start signal and the clock signals. 
         [0074]    The data driver  230  may generate data signals in response to a data driving control signal DCS. The data driver  230  may generate the data signal in an analog form based on image data (e.g., second data DATA 2 ) in a digital form. The data driver  230  may generate data signals based on grayscale voltages (or gamma voltages) predetermined, where the grayscale voltages may be provided from a gamma circuit. The data driver  230  may provide data signals to pixels included in pixel columns. 
         [0075]    The timing controller  240  may receive input image data (e.g., the first data DATA 1 ) and input control signals (e.g., a horizontal synchronization signal, a vertical synchronization signal, and clock signals) from an external component (e.g., an application processor) and may generate converted data (e.g., the second data DATA 2 ) suitable for the display panel  210  to display an image. In embodiments, the timing controller  240  may control the scan driver  220  and the data driver  230 . The timing controller  240  may generate the scan driving control signal SCS and the data driving control signal DCS based on the input control signals. 
         [0076]    In some example embodiments, the timing controller  240  may generate the converted data (e.g., the second data DATA 2 ) by changing orders of line data included in the second image data corresponding to the second displaying region R 2 . In embodiments, the line data may correspond to pixel columns (e.g., the m+1th through 2mth pixel columns). In embodiments, the timing controller  240  may generate the converted data by maintaining orders of line data included in the first image data corresponding to the first displaying region R 1  (e.g., by not changing the order of line data corresponding to the first through mth pixel columns). In embodiments, the timing controller  240  may generate the converted data by maintaining the first image data and by changing (or by delaying) the orders of some data among the second image data. 
         [0077]    The timing controller  240  may alleviate visibility of an artifact by converting the second data to be different from the first image data (and/or by converting the second image data to be asymmetric with the first image data). 
         [0078]    The power supply  250  may generate a driving voltage and may provide the driving voltage to the display panel  210  (or the pixel PX). In embodiments, the driving voltage may be power voltages required to drive the pixel PX. For example, the driving voltage may include a first power voltage ELVDD and a second power voltage ELVSS. In embodiments, the first power voltage ELVDD may be greater (or higher) than the second power voltage ELVSS. 
         [0079]    As described above, the display device  100  according to example embodiments may generate converted data (e.g., the second data DATA 2 ) by changing orders of the line data included in the second image data corresponding to the second displaying region R 2 . In embodiments, the display device  100  may reduce visibility of an artifact by converting the second data to be asymmetric with the first image data. 
         [0080]      FIGS. 4A and 4B  are diagrams illustrating images displayed by a display panel set according to embodiments. A display panel set of the head mounted display device  10  may be implemented as a display panel  410  discussed with reference to  FIG. 4A . 
         [0081]    Referring to  FIG. 4A , the display panel  410  may include pixels R, and B which are arranged in a Pentile (TM) format. For example, the pixels R, and B are arranged in a diamond Pentile format. According to the Pentile format, the display panel  410  may include first type pixel columns and second type pixel columns arranged alternately and repeatedly. 
         [0082]    The first type pixel columns may include first pixels R and third pixels B arranged alternately in a column direction. In embodiments, each first pixel R may emit a light with a first color (e.g., a red color), and each third pixel B may emit a light with a third color (e.g., a blue color). The first type pixel columns may include odd-numbered pixel columns such as a first pixel column, a third pixel column, etc. 
         [0083]    The second type pixel columns may include second pixels G arranged in a column direction. In embodiments, each second pixel G may emit a light with a second color (e.g., a green color). The second type pixel columns may include even-numbered pixel columns such as a second pixel column, a fourth pixel column, etc. 
         [0084]    As illustrated in  FIG. 4A , a first comparative left image IMAGE_L 1 _C (e.g., an image corresponding to a left eye of the user) may be displayed on the first displaying region R 1 , and a first comparative right image IMAGE_R 1 _C (e.g., an image corresponding to a right eye of the user) may be displayed on the second displaying region R 2 . The first comparative left image IMAGE_L 1 _C may correspond to a third pixel column through an m−2th pixel column, and the first comparative right image IMAGE_R 1 _C may correspond to an m+3th pixel column through a 2m−2th pixel column (or a third pixel column through an m−2th pixel column in the second displaying region R 2 ). 
         [0085]    As illustrated in  FIG. 4B , a first comparative composite image IMAGE_C 1 _C may be seen by the user and may be represented by summing the first comparative left image IMAGE_L 1 _C and the first comparative right image IMAGE_R 1 _C. 
         [0086]    Because a pixel arrangement corresponding to the first comparative left image IMAGE_L 1 _C is substantially the same as (i.e., identical to) a pixel arrangement corresponding to the first comparative right image IMAGE_R 1 _C, a pixel arrangement corresponding to the first comparative composite image IMAGE_C 1 _C may be substantially the same as (i.e., identical to) a pixel arrangement corresponding to the first comparative left image IMAGE_L 1 _C and/or may be substantially identical to the first comparative right image IMAGE_R 1 _C. 
         [0087]    In embodiments, an artifact may occur (and/or may be visible to the user) at an edge of the first comparative composite image IMAGE_C 1 _C (or at an edge or at a boundary of an object in the first comparative composite image IMAGE_C 1 _C). For example, when the first comparative composite image IMAGE_C 1 _C is an image with a full white pattern, a first color (e.g., a red color corresponding to the first pixel R) and a third color (e.g., a blue color corresponding to the third pixel B) may be seen at a first portion P 1  corresponding to the third pixel column, and a second color (e.g., a green color corresponding to the second pixel, green line) may be seen at a second portion P 2  corresponding to the m−2th pixel column. 
         [0088]    The display device  100  according to example embodiments may mitigate visibility of the artifact by changing orders of line data included in the right image data corresponding to the second displaying region R 2 . 
         [0089]      FIGS. 4C and 4D  are diagrams illustrating an example of an image displayed by a display panel set according to embodiments. 
         [0090]    Referring to  FIG. 4C , a first left image IMAGE_L 1  (e.g., an image corresponding to the left eye of the user) may be displayed on the first displaying region R 1 , and a first right image IMAGE_R 1  (e.g., an image corresponding to the right eye of the user) may be displayed on the second displaying region R 2 . The first left image IMAGE_L 1  may correspond to the third pixel column through the m−2th pixel column and may be substantially the same as the first comparative left image IMAGE_L 1 _C described with reference to  FIG. 4A . The first right image IMAGE_R 1  may correspond an m+4th pixel column through a 2m−1th pixel column and may be shifted by one pixel column in a first direction (or in a row direction) with respect to the first comparative right image IMAGE_R 1 _C described with reference to  FIG. 4A . 
         [0091]    In some example embodiments, the display device  100  may shift first line data corresponding to the first type pixel columns (e.g., corresponding to the odd-numbered pixel columns) in the second displaying region R 2 . For example, the display device  100  may map (or remap, correspond) line data corresponding to the m+3th pixel column illustrated in  FIG. 4A  to an m+5th pixel column adjacent to the m+3th pixel column. On the other hand, the display device  100  may maintain (or not remap) second line data corresponding to the second type pixel columns (e.g., corresponding to the even-numbered pixel columns) in the second displaying regions R 2 . That is, the display device  100  may remap only the first line data corresponding to the first type pixel columns not the second line data corresponding to the second type pixel columns in the second displaying regions R 2 . In embodiments, the first right image IMAGE_R 1  may be shifted by one pixel column in the first direction (or in the row direction) with respect to the first comparative right image IMAGE_R 1 _C described with reference to  FIG. 4A . 
         [0092]    As illustrated in  FIG. 4D , a first composite image IMAGE_C 1  may be seen by the user and may be represented by summing the first left image IMAGE_L 1  and the first right image IMAGE_R 1 . 
         [0093]    A pixel arrangement corresponding to the first left image IMAGE_L 1  may be different from a pixel arrangement corresponding to the first right image IMAGE_R 1  and may compensate the pixel arrangement corresponding to the first right image IMAGE_R 1 . Compared with the first portion P 1  described with reference to  FIG. 4B , a third portion P 3  corresponding to the third pixel column may further include the second color. Therefore, the first through third colors are mixed at the third portion P 3  such that the first color and third color may not be visible or conspicuous to the user. Similarly, compared with the second portion P 2  described with reference to  FIG. 4B , a fourth portion P 4  corresponding to the m−2th pixel column may further include the first color and the third color. Therefore, the second color (e.g., a green line) may not be visible or conspicuous to the user. 
         [0094]    As described with reference to  FIGS. 4A through 4D , the display device  100  according to example embodiments may mitigate undesirable visibility of artifacts by changing orders or mapping of line data included in the second image data (or in the right image data) corresponding to the second displaying region R 2 . 
         [0095]    In  FIG. 4C , the first right image IMAGE_R 1  is described to be shifted in the first direction with reference to the first comparative right image IMAGE_R 1 _C described with reference to  FIG. 4A . However, embodiments are not limited thereto. For example, the first left image IMAGE_L 1  may be shifted in the first direction with respect to the first comparative left image data IMAGE_L 1 _C described with reference to  FIG. 4A . In embodiments, the left image IMAGE_L 1  and the first right image IMAGE_R 1  may be different from each other to compensate (or supplement, complement) each other. 
         [0096]      FIG. 5A  is a block diagram illustrating a timing controller included in the head mount display device of  FIG. 1  according to embodiments.  FIG. 5B  is a diagram illustrating a sub-pixel rendering filter used by the timing controller of  FIG. 5A  according to embodiments.  FIG. 5C  is a diagram illustrating converted data processed and/or provided by the sub-pixel rendering filter of  FIG. 5B  according to embodiments. 
         [0097]    The timing controller  240  illustrated in  FIG. 2  may be implemented as a timing controller  540  discussed with reference to one or more of  FIGS. 5A, 5B, 5C, 6B, and 6C . Referring to  FIG. 5A , the timing controller  500  may include a rendering unit  510 . The rendering unit  510  may convert the input image data in a stripe format (e.g., data in RGB format) into converted data in the Pentile format (e.g., data in RGBG format). For reference, pixel data in the input image data may correspond to a reference pixel PXR illustrated in FIG.  4 C, and the reference pixel PXR may include a half of a first pixel R, a half of a third pixel B, and a second pixel G. 
         [0098]    In some example embodiments, the timing controller  500  may generate the converted data using a first sub-pixel rendering filter SPRF 1  and a second sub-pixel rendering filter SPRF 2  illustrated in  FIG. 5B . 
         [0099]    For example, the timing controller  500  may apply the first sub-pixel rendering filter SPRF 1  to the first image data (e.g., left data corresponding to the first displaying region R 1 ) (i.e., may perform a first sub-pixel rendering) and may apply the second sub-pixel rendering filter SPRF 2  to the second image data (e.g., right data corresponding to the second displaying region R 2 ) (i.e., may perform a second sub-pixel rendering). 
         [0100]    The timing controller  500  may perform sub-pixel rendering to the first sub-data (or, first line data) corresponding to the first pixel R and the third pixel B but may perform no sub-pixel rendering to second sub-data (e.g., second line data) corresponding to the second pixel G because the reference pixel PXR may include one second pixel G. 
         [0101]    As illustrated in  FIG. 5B , the first sub-pixel rendering filter SPRF 1  may include weights for a corresponding pixel (or a target pixel) and a first adjacent pixel which is adjacent to the corresponding pixel. In embodiments, the first adjacent pixel may be included in a pixel row including the corresponding pixel and may be included in a pixel column positioned immediately at the left side of a pixel column including the corresponding pixel. In embodiments, each of the weights may be ½ (or 0.5). 
         [0102]    As illustrated in  FIG. 5C , first sub-converted data DATA 1 _R_C 1  (or first converted data subset DATA 1 _R_C 1 ) may be generated by applying the first sub-pixel rendering filter SPRF 1  to first sub-data DATA 1 _R and may be used for the first displaying region R 1 . 
         [0103]    The first sub-converted data DATA 1 _R_C 1  may include data values corresponding to a 12th pixel (e.g., a pixel located in a first row and a second column), a 14th pixel, a 21th pixel, a 23th pixel, etc. according to a pixel arrangement (e.g., according to a pixel arrangement in the Pentile format). For example, a data value corresponding to the 12th pixel (e.g., 2′) in the first sub-converted data DATA 1 _R_C 1  may be equal to an average of a data value corresponding to the 11th pixel (e.g., 1) and a data value corresponding to the 12th pixel (e.g., 2) in the first sub-data DATA 1 _R (or first data subset DATA 1 _R) according to the first sub-pixel rendering filter SPRF 1 . 
         [0104]    Referring again to  FIG. 5B , the second sub-pixel rendering filter SPRF 2  may include weights for the first adjacent pixel adjacent to the corresponding pixel and a second adjacent pixel. In embodiments, the second adjacent pixel may be included in the pixel row including the first adjacent pixel and may be included in a pixel column positioned immediately at the left side of the pixel column including the first adjacent pixel. In embodiments, each of the weights may be ½ (or 0.5). 
         [0105]    As illustrated in  FIG. 5C , third sub-converted data DATA 1 _R_C 3  (or third converted data subset DATA 1 _R_C 3 ) may be generated by applying the second sub-pixel rendering filter SPRF 2  to first sub-data DATA 1 _R and may be used for the second displaying region R 2 . 
         [0106]    The third sub-converted data DATA 1 _R_C 3  may include data values corresponding to a 13th pixel (e.g., a pixel located in a first row and a third column), a 22th pixel, a 24th pixel, etc. according to the pixel arrangement (e.g., according to a pixel arrangement in the Pentile format). For example, a data value corresponding to the 13th pixel (e.g., 2′) in the third sub-converted data DATA 1 _R_C 3  may be equal to an average of a data value corresponding to the 11th pixel (e.g., 1) and a data value corresponding to the 12th pixel (e.g., 2) in the first sub-data DATA 1 _R according to the second sub-pixel rendering filter SPRF 2 . 
         [0107]    A loss data set DATA 1 _L may occur because the third sub-converted data DATA 1 _R_C 3  is shifted with respect to the first sub-converted data DATA 1 _R_C 1 . 
         [0108]    However, as described with reference to  FIG. 3A , the input image data includes valid values (or valid data values) corresponding to the fourth displaying region R 4  and includes invalid values (e.g., a black data value) corresponding to portions of the second displaying region R 2  outside the fourth displaying region R 4 . Therefore, the loss data DATA 1 _L may include only invalid values such that the first composite image IMAGE_C 1  illustrated in  FIG. 4D  (e.g., an image corresponding to the third sub-converted data DATA 1 _R_C 3 ) may be displayed satisfactorily and/or normally. 
         [0109]    As described with reference to  FIGS. 5A through 5C , the timing controller  500  may generate right image data to supplement left image data by changing orders and/or mapping in the second image data corresponding to the second displaying region R 2  (e.g., by shifting the first line data in the second image data in the first direction) during performing the sub-pixel rendering. Therefore, the display device  100  may mitigate visibility of artifacts in displayed images. 
         [0110]      FIG. 6A  is a diagram illustrating images displayed by a display panel set according to embodiments. The display panel set  210  illustrated in  FIG. 2  may be implemented as a display panel set discussed with reference to  FIG. 6A .  FIG. 6B  is a diagram illustrating a sub-pixel rendering filter used by the timing controller of  FIG. 5A  according to embodiments.  FIG. 6C  is a diagram illustrating converted data processed and/or provided by the sub-pixel rendering filter of  FIG. 6B  according to embodiments. 
         [0111]    Referring to  FIG. 6A , the display panel  610  and a second left image IMAGE_L 2  illustrated in  FIG. 6A  may be substantially the same as the display panel  410  and the first left image IMAGE_L 1 _C described with reference to  FIG. 4A . 
         [0112]    The second right image IMAGER may correspond to an m+2th pixel column through a 2m−3th pixel column (or a second pixel column through an m−3th pixel column in the second displaying region R 2 ) and may be shifted by one pixel column in a second direction (e.g., in a direction opposite to the first direction) with respect to the first comparative right image IMAGE_R 1 _C described with reference to  FIG. 4A . 
         [0113]    In some example embodiments, the display device  100  may shift second line data corresponding to the second type pixel columns (e.g., the even-numbered pixel columns) in the second displaying region R 2  in the second direction. For example, the display device  100  may map (or remap, correspond) line data corresponding to an m+4th pixel column illustrated in  FIG. 4A  to an m+2th pixel column adjacent to the m+2th pixel column. On the other hand, the display device  100  may maintain (or not remap) first line data corresponding to the first type pixel columns (e.g., the odd-numbered pixel columns) in the second displaying region R 2 . That is, the display device  100  may remap only line data corresponding to the even-numbered pixel columns not line data corresponding to the odd-numbered pixel columns in the second displaying regions R 2 . In embodiments, the second right image IMAGE_R 2  may be shifted by one pixel column in the second direction with respect to the first comparative right image IMAGE_R 1 _C described with reference to  FIG. 4A . 
         [0114]    A second composite image displayed to (or seen by) the user may be represented by summing the second left image IMAGE_L 2  and the second right image IMAGE_R 2  and may be similar to the first composite image IMAGE_C 1 . Therefore, substantially no artifact may be conspicuous or visible to the user. 
         [0115]    In some example embodiments, the timing controller  500  may generate the converted data by applying a third sub-pixel rendering filter SPRF 3  to the input image data. 
         [0116]    For example, the timing controller  500  may apply the third sub-pixel rendering filter SPRF 3  to produce the right data corresponding to the second displaying region R 2 . But the timing controller  500  may not apply the third sub-pixel rendering filter SPRF 3  (and/or may apply no sub-pixel rendering filter) to produce the left data corresponding to the first displaying region R 1 . 
         [0117]    As illustrated in  FIG. 6B , the third sub-pixel rendering filter SPRF 3  may include a weight for an adjacent pixel adjacent to a corresponding pixel. In embodiments, the adjacent pixel may be included in a pixel row including the corresponding pixel and may be included in a pixel column positioned immediately at the right side of a pixel column including the corresponding pixel. In embodiments, the weights may be ½ (or 0.5). 
         [0118]    As illustrated in  FIG. 6C , second sub-converted data DATA 1 _G_C 2  (or second converted data subset DATA 1 _G_C 2 ) may be generated by applying the third sub-pixel rendering filter SPRF 3  to second sub-data DATA 1 _G (e.g., second sub-data of the second image data corresponding to the second displaying region R 2 ). 
         [0119]    A loss data set DATA 2 _L may occur because the second sub-converted data DATA 1 _G_C 2  is shifted with respect to the second sub-data DATA_G 1 . 
         [0120]    However, as described with reference to  FIG. 3A , the input image data includes valid values (or valid data values) corresponding to the fourth displaying region R 4  and includes invalid values (e.g., a black data value) corresponding to portions of the second displaying region R 2  outside the fourth displaying region R 4 . Therefore, the loss data DATA 2 _L may include only invalid values such that the second composite image (e.g., an image corresponding to the second sub-converted data DATA 1 _G_C 2 ) may be displayed normally and/or satisfactorily. 
         [0121]    As described with reference to  FIGS. 6A through 6C , the display device  100  may output the second right image IMAGE_R 2  to supplement the left image IMAGE_L 2  by changing orders and/or mapping in the second image data corresponding to the second displaying region R 2  (e.g., by shifting the second line data in the second image data in the second direction) during performing the sub-pixel rendering. Therefore, the display device  100  may mitigate visibility of artifacts in displayed images. 
         [0122]    The display device  100  is described in  FIG. 4A through 6C  to include pixels R, and B arranged in the Pentile format. This is illustrated by way of an example. However, embodiments are not limited thereto. In embodiments, the display device  100  may include pixels R, and B arranged in a stripe format. 
         [0123]      FIG. 7  is a diagram illustrating a display panel set according to embodiments. The display panel set  210  illustrated in  FIG. 2  may be implemented as a display panel set  710  discussed with reference to  FIG. 7 . 
         [0124]    Referring to  FIG. 7 , the display panel set  710  may include pixels R, and B arranged in a stripe format. For example, the display panel  710  may include first pixels R, second pixels and third pixels B which are arranged in the first direction (or in the column direction) sequentially and repeatedly. 
         [0125]    As illustrated in  FIG. 7 , a third left image IMAGE_L 3  (e.g., an image corresponding to the left eye of the user) may be displayed on the first displaying region R 1 , and a third right image IMAGE_R 3  (e.g., an image corresponding to the right eye of the user) may be displayed on the second displaying region R 2 . The third left image IMAGE_L 3  may correspond to a fourth pixel column through an m−3th pixel column, and the third right image IMAGE_R 3  may correspond to an m+3th pixel column through a 2m−4th pixel column (or a third pixel column through an m−4th pixel column in the second displaying region R 2 ). The third right image IMAGE_R 3  may be shifted by one pixel column in the second direction with respect to the third left image IMAGE_L 3 . 
         [0126]    In some example embodiments, the display device  100  may shift line data corresponding to a 3kth pixel column (e.g., an m+3th pixel column, a 2mth pixel column, etc.) in the second displaying region R 2  in the second direction, where k is a positive integer. For example, the display device  100  may remap line data corresponding to an m+6th pixel column (e.g., a pixel column including the second pixel B) to the m+3th pixel column. For example, the display device  100  may shift the line data (e.g., line data corresponding to the pixel column including the second pixel B) using the third sub-pixel rendering filter SPRF 3  described with reference to  FIG. 6B . 
         [0127]    On the other hand, the display device  100  may maintain (or not remap) line data corresponding to a 3k−2th pixel column and a 3k−1th pixel column in the second displaying region R 2 . In embodiments, third right image IMAGE_R 3  may be shifted by one pixel column with respect to a third left image IMAGE_L 3 . 
         [0128]    A third composite image displayed to (or seen by) the user may be represented by summing the third left image IMAGE_L 3  and the third right image IMAGE_R 3 , and the third right image IMAGE_R 3  may complement the third left image IMAGE_L 3 . Therefore, substantially no artifact may be conspicuous or visible to the user. 
         [0129]    The third right image IMAGE_R 3  is described to be shifted by one pixel column in the second direction with respect to the third left image IMAGE_L 3  in  FIG. 7 . This is illustrated by way of an example. However, embodiments are not limited thereto. In embodiments, the third right image IMAGE_R 3  may be shifted in the first direction opposite to the second direction with respect to the third left image IMAGE_L 3  or may be shifted by two pixel columns. 
         [0130]      FIG. 8  is a diagram illustrating a display panel set according to embodiments. The display panel set  210  illustrated in  FIG. 2  may be implemented as a display panel set  810  discussed with reference to  FIG. 8 . 
         [0131]    Referring to  FIG. 8 , the display panel  810  may include a first display panel  811  and a second display panel  812 . The first display panel  811  may be substantially the same as the first display panel  311  described with reference to  FIG. 3B , and the second display panel  812  may be substantially the same as the second display panel  312  described with reference to  FIG. 3B . 
         [0132]    The first display panel  811  and the second display panel  812  may include pixels R, G, and B arranged in the Pentile format. The first display panel  811  may include the pixel R, G, and B arranged in a first pixel arrangement, but the second display panel  812  may include the pixel R, and B arranged in a second pixel arrangement. In embodiments, the second pixel arrangement may be different from the first pixel arrangement. For example, the second pixel arrangement may be opposite to the first pixel arrangement. For example, the first pixel arrangement may have an order such as BGRG, and the second pixel arrangement may have an order such as GRGB. 
         [0133]    In embodiments, a first pixel column of the first display panel  811  may include third pixels B and first pixels R arranged alternately, and a second pixel column of the first display panel  811  may include second pixel G In embodiments, in the first display panel  811 , odd-numbered pixel columns may include third pixels B and first pixels R, and even-numbered pixel columns may include second pixels G. 
         [0134]    An m+1th pixel column (or a first pixel column) of the second panel  812  may include second pixels G and an m+2th pixel column (or a second pixel column) of the second display panel  812  may include third pixels B and first pixels R arranged alternately. In embodiments, in the second display panel  812 , odd-numbered pixel columns may include second pixels and even-numbered pixel columns may include third pixels B and first pixels R. 
         [0135]    As illustrated in  FIG. 8 , a fourth left image IMAGE_L 4  (e.g., an image corresponding to the left eye of the user) may be displayed on the first display panel  811 , and a fourth right image IMAGE_R 4  (e.g., an image corresponding to the right eye of the user) may be displayed on the second display panel  812 . The fourth left image IMAGE_L 4  may correspond to a third pixel column through an m−2th pixel column, and the fourth right image IMAGE_R 4  may correspond to an m+3th pixel column through an 2m−2th pixel column (or a third pixel column through an m−2th pixel column in the second display panel  812 ). 
         [0136]    A pixel arrangement corresponding to the fourth right image IMAGE_R 4  may be different from a pixel arrangement corresponding to the fourth left image IMAGE_L 4  and may supplement the pixel arrangement corresponding to the fourth left image IMAGE_L 4 . 
         [0137]    Therefore, the display device  100  may supplement the fourth left image IMAGE_L 4  displayed on the first display panel  811  using the fourth right image IMAGE_R 4  displayed on the second display panel  812  without an additional processing of input image data. Therefore, substantially no artifacts may be conspicuous or visible to the user. 
         [0138]    Embodiments may be applicable to various types of display devices (e.g., an organic light emitting display device, a liquid crystal display device, etc.). Embodiments may be applicable to one or more of a television, a computer monitor, a laptop, a digital camera, a cellular phone, a smart phone, a personal digital assistant (PDA), a portable multimedia player (PMP), an MP3 player, a navigation system, a video phone, etc. 
         [0139]    The foregoing is illustrative of example embodiments, and is not to be construed as limiting thereof. Although a few example embodiments have been described, those skilled in the art will readily appreciate that many modifications are possible in the example embodiments without materially departing from the novel teachings and advantages of example embodiments. All such modifications are intended to be included within the scope 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.