Patent Publication Number: US-2016223858-A1

Title: Liquid crystal display device and manufacturing method thereof

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to and the benefit of Korean Patent Application No. 10-2015-0016903 filed in the Korean Intellectual Property Office on Feb. 3, 2015, the entire contents of which are incorporated herein by reference. 
     BACKGROUND 
     (a) Technical Field 
     The present disclosure generally relates to a liquid crystal display including a white pixel, and a manufacturing method thereof. 
     (b) Description of the Related Art 
     Liquid crystal displays are widely used in flat panel displays. A liquid crystal display (LCD) typically includes two display panels on which field generating electrodes such as a pixel electrode and a common electrode are formed, and a liquid crystal layer interposed between the two display panels. The LCD can display an image by applying a voltage to the field generating electrodes to generate an electric field over the liquid crystal layer. The electric field determines the alignment directions of liquid crystal molecules in the liquid crystal layer, and controls polarization of incident light passing through the liquid crystal layer, thereby allowing an image to be displayed on the LCD. 
     Since the liquid crystal display is not self-emissive, a light source is required. The light source may be a separately provided artificial light source or a natural light source. The artificial light source used in the liquid crystal display may include a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), or an external electrode fluorescent lamp (EEFL). The artificial light source is disposed at a rear surface or a lateral surface of the liquid crystal display to emit light. For example, the light source may be a white light source for emitting white light. 
     In general, a color filter is used in the liquid crystal display to enable red, green, and blue colors to be displayed. Recently, a liquid crystal display including white pixels in addition to red, green, and blue pixels, has been being developed to increase the luminance thereof. 
     The above information disclosed in this Background section is only to enhance understanding of the background of the inventive concept and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. 
     SUMMARY 
     The present disclosure provides a liquid crystal display and a manufacturing method thereof. The exemplary liquid crystal display has several advantages. For example, a shape of a color filter in the liquid crystal display may be changed to prevent the occurrence of a yellowish defect and to improve luminance. In addition, a visibility difference between a front surface and a lateral surface of the liquid crystal display is improved. 
     According to an exemplary embodiment of the inventive concept, a liquid crystal display is provided. The liquid crystal display includes: a first substrate; a second substrate facing the first substrate; a liquid crystal layer formed between the first substrate and the second substrate; and a first color pixel area, a second color pixel area, a third color pixel area, and a fourth color pixel area, wherein the first, second, third, and fourth color pixel areas are formed on one of the first substrate and the second substrate, wherein the first, second, and third color pixel areas respectively include one of a red filter, a green filter, and a blue filter, and the fourth color pixel area includes a white filter, and wherein a cross-section of the white filter has a parabolic shape or a semicircular shape. 
     In some embodiments, a cross-section of the red filter, the green filter, and the blue filter may have a rectangular shape. 
     In some embodiments, the liquid crystal display may further include a plurality of light blocking members formed between the red filter, the green filter, the blue filter, and the white filter. 
     In some embodiments, the liquid crystal display may further include an overcoat formed covering the red filter, the green filter, the blue filter, the white filter, and the light blocking members may. 
     In some embodiments, the liquid crystal display may further include a plurality of pixel electrodes disposed in the first color pixel area, the second color pixel area, the third color pixel area, and the fourth color pixel area. 
     In some embodiments, the liquid crystal display may further include a light source disposed at a rear surface of one of the first substrate and the second substrate. 
     According to another embodiment of the inventive concept, a liquid crystal display is provided. The liquid crystal display includes: a first substrate; a second substrate facing the first substrate; a liquid crystal layer formed between the first substrate and the second substrate; and a first color pixel area, a second color pixel area, a third color pixel area, and a fourth color pixel area formed on one of the first substrate and the second substrate, wherein the first, second, and third color pixel areas respectively include one of a red filter, a green filter, and a blue filter, and the fourth color pixel area includes a white filter, and wherein a surface of the white filter is formed having a convex portion and a concave portion. 
     In some embodiments, a cross-section of the red filter, the green filter, and the blue filter may have a rectangular shape. 
     In some embodiments, the liquid crystal display may further include: a plurality of light blocking members formed between the red filter, the green filter, the blue filter, and the white filter. 
     In some embodiments, the liquid crystal display may further include: an overcoat formed covering the red filter, the green filter, the blue filter, the white filter, and the light blocking members. 
     In some embodiments, a surface of the overcoat may be formed having an embossed shape including the convex portion and the concave portion. 
     In some embodiments, the liquid crystal display may further include: a plurality of pixel electrodes disposed in the first color pixel area, the second color pixel area, the third color pixel area, and the fourth color pixel area. 
     According to a further embodiment of the inventive concept, a method of manufacturing a liquid crystal display is provided. The method includes: forming a plurality of light blocking members that separately divide regions for first, second, third, and fourth color pixel areas on a first substrate; forming a red filter, a green filter, and a blue filter respectively on the first, second, and third color pixel areas; performing a hydrophobic treatment on surfaces of the red, green, and blue filters in the first, second, and third color pixel areas, and performing a hydrophilic treatment on a surface of the fourth color pixel area; and forming a white filter in the fourth color pixel area. 
     In some embodiments, a cross-section of the red filter, the green filter, and the blue filter may have a rectangular shape. 
     In some embodiments, the method may further include: forming an overcoat to cover the red, green, blue, and white filters, and the light blocking members. 
     According to one or more of the above exemplary embodiments, a yellowish defect can be prevented, good luminance can be achieved, and a visibility difference between the front and lateral surfaces of a liquid crystal display can be improved by changing a shape of a color filter in the liquid crystal display. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a top plan view of a liquid crystal display according to a first exemplary embodiment. 
         FIG. 2  is a cross-sectional view of the liquid crystal display of  FIG. 1  taken along line II-II. 
         FIG. 3  is a top plan view illustrating a white pixel area of the liquid crystal display according to the first exemplary embodiment. 
         FIG. 4  is a cross-sectional view of the liquid crystal display of  FIG. 3  taken along line IV-IV. 
         FIG. 5  is a cross-sectional view of a liquid crystal display according to a second exemplary embodiment. 
         FIG. 6  is a cross-sectional view of a liquid crystal display according to a third exemplary embodiment. 
         FIG. 7  is a cross-sectional view of a liquid crystal display according to a fourth exemplary embodiment. 
         FIG. 8  is a cross-sectional view of a liquid crystal display according to a fifth exemplary embodiment. 
         FIGS. 9, 10, and 11  are cross-sectional views sequentially illustrating a method of manufacturing the liquid crystal display according to the first exemplary embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     The inventive concept will be described more fully herein with reference to the accompanying drawings, in which exemplary embodiments are shown. As those skilled in the art would realize, the embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure. 
     In the drawings, the thickness of layers, films, panels, regions, etc., may be exaggerated for clarity. 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 disposed directly on the other element, or with one or more intervening elements being present. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. 
     First, a liquid crystal display according to an exemplary embodiment will be described in detail with reference to  FIGS. 1 and 2 . 
       FIG. 1  is a top plan view of a liquid crystal display according to a first exemplary embodiment, and  FIG. 2  is a cross-sectional view of the liquid crystal display of  FIG. 1  taken along line II-II. 
     Referring to  FIGS. 1 and 2 , the liquid crystal display includes a first substrate  110  and a second substrate  210  disposed facing each other, and a liquid crystal layer  3  disposed between the first substrate  110  and the second substrate  210 . 
     The first substrate  110  and the second substrate  210  may be made of glass, plastic, or the like. The liquid crystal layer  3  may include a plurality of liquid crystal molecules  310 , and may be formed as a positive type or a negative type. 
     A light source  500  may be disposed on a rear surface of the first substrate  110 . The light source  500  may include a light emitting diode (LED) configured to emit light  510 . An orientation of the liquid crystal molecules  310  of the liquid crystal layer  3  is determined by an electric field generated between the first substrate  110  and the second substrate  210 , and an amount of light passing through the liquid crystal layer  3  varies according to the orientation of the liquid crystal molecules  310 . A plurality of color filters  230 R,  230 G,  230 B, and  230 W are disposed on the second substrate  210 . When the light passing through the liquid crystal layer  3  is incident to the color filters  230 R,  230 G,  230 B, and  230 W, a portion of the light passes through the colors filters while the remaining portion of the light is absorbed by the color filters. 
     For convenience of illustration, the light source  500  is shown disposed on the rear surface of the first substrate  110 . However, the inventive concept is not limited thereto. In some other embodiments, the light source  500  may be disposed on a rear surface of the second substrate  210  instead of the rear surface of the first substrate  110 . 
     The liquid crystal display may include a plurality of pixel areas. The pixel areas may be divided into a first color pixel area PX(R), a second color pixel area PX(G), a third color pixel area PX(B), and a fourth color pixel area PX(W). The first color pixel area PX(R), the second color pixel area PX(G), and the third color pixel area PX(B) display different colors, and the colors may be combined to produce a white color. The fourth color pixel area PX(W) may display a white color. For example, the first color pixel area PX(R), the second color pixel area PX(G), the third color pixel area PX(B), and the fourth color pixel area PX(W) may respectively display red, green, blue, and white colors. 
     However, the inventive concept is not limited thereto. For example, in some other embodiments, the first color pixel area PX(R), the second color pixel area PX(G), the third color pixel area PX(B), and the fourth color pixel area PX(W) may respectively display cyan, magenta, yellow, and white colors. 
     The color filters  230 R,  230 G,  230 B, and  230 W are disposed in the respective pixel areas on the second substrate  210 . Specifically, the red filter  230 R, the green filter  230 G, and the blue filter  230 B are respectively disposed in the first color pixel area PX(R), the second color pixel area PX(G), and the third color pixel area PX(B). The red filter  230 R may allow only red color light (of the white light) to pass through. The green filter  230 G may allow only green color light (of the white light) to pass through. The blue filter  230 B may allow only blue color light (of the white light) to pass through. 
     The white filter  230 W may be disposed in the fourth color pixel area PX(W). Since the fourth color pixel area PX(W) is transparent, the white filter  230 W may be formed of a photoresist that allows all wavelength bands of the visual rays to pass through. However, it should be noted that the inventive concept is not limited thereto. For example, in some other embodiments, the white filter  230 W may be formed of a photoresist that allows only selected wavelength bands of the visual rays to pass through. 
     Accordingly, the white filter  230 W is a filter wherein a wavelength of light passing through the white filter  230 W is not substantially changed so that the color of the transmitted light is maintained. However, the inventive concept is not limited thereto. In some other embodiments, the white filter  230 W may be a filter wherein a wavelength of light passing through the white filter  230 W is changed in a predetermined range according to a characteristic of the white filter  230 W. 
     Each of the pixel areas PX(R), PX(G), PX(B), and PX(W) may have a rectangular shape with two short sides and two long sides. The red filter  230 R, the green filter  230 G, the blue filter  230 B, and the white filter  230 W may be respectively formed having a quadrangular flat shape corresponding to the shape of the pixel areas PX(R), PX(G), PX(B), and PX(W). 
     In some embodiments, a cross-section of the white filter  230 W may have a parabolic shape or a semicircular shape. 
     In the liquid crystal display comprising the color filters  230 R,  230 G,  230 B, and  230 W, a first white color can be displayed using a combination of the red filter  230 R, the green filter  230 G, and blue filter  230 B, and a second white color can be displayed using the white filter  230 W. In some cases, there may be a difference between the first white color and the second white color if the first and second white colors are not well-balanced. 
     Furthermore, when the liquid crystal display is viewed laterally, a light path at the lateral side of the flat white filter  230 W is longer than a light path at the front side of the flat white filter  230 W. As a result, a yellowish defect may occur at the lateral side of the flat white filter  230 W. 
     However, when a cross-section of the white filter  230 W is formed having a parabolic shape or a semicircular shape, light path lengths at the lateral and front sides of the white filter  230 W may be adjusted such that the light path lengths are similar to each other. Accordingly, the occurrence of the yellowish defect may be prevented. 
     The red, green, and blue filters  230 R,  230 G, and  230 B excluding the white filter  230 W may be formed having a rectangular cross-section. 
     A plurality of light blocking members  220  may be further disposed at the boundaries between the first color pixel area PX(R), the second color pixel area PX(G), the third color pixel area PX(B), and the fourth color pixel area PX(W). The light blocking members  220  can prevent color mixture, light leakage, and other defects that may occur at the boundaries between the pixel areas PX(R), PX(G), PX(B), and PX(W). 
     An overcoat  240  may be further disposed on the red filter  230 R, the green filter  230 G, the blue filter  230 B, the white filter  230 W, and the light-blocking member  220 . The overcoat  240  serves to planarize a top surface of the second substrate  210 . 
     In some embodiments, the white filter  230 W may be formed of the same material as the overcoat  240  using the same process. 
     Next, the white pixel area PX(W) of the liquid crystal display according to the first exemplary embodiment will be described in further detail with reference to  FIGS. 3 and 4 . 
       FIG. 3  is a top plan view illustrating the white pixel area PX(W) of the liquid crystal display according to the first exemplary embodiment, and  FIG. 4  is a cross-sectional view of the liquid crystal display of  FIG. 3  taken along line IV-IV. 
     Referring to  FIGS. 3 and 4 , a gate line  121  and a storage electrode line  131  are formed on a first substrate  110 . 
     The gate line  121  extends in a substantially horizontal direction and transmits a gate signal. A gate electrode  124  is formed protruding from the gate line  121 . 
     The storage electrode line  131  extends in a direction parallel to the gate line  121 , that is, in a horizontal direction, and transmits a predetermined voltage such as a common voltage. A storage electrode  133  is formed protruding from the storage electrode line  131 . The storage electrode  133  may be formed surrounding the edges of the fourth color pixel area PX(W). 
     A gate insulating layer  140  is formed on the gate line  121 , the gate electrode  124 , the storage electrode line  131 , and the storage electrode  133 . The gate insulating layer  140  may be made of an inorganic insulating material such as a silicon nitride (SiNx) or a silicon oxide (SiOx). Furthermore, the gate insulating layer  140  may be formed as a single layer or having a multi-layer structure. 
     A semiconductor  154  is formed on the gate insulating layer  140 . The semiconductor  154  is formed overlapping with the gate electrode  124 . The semiconductor  154  may be made of amorphous silicon, polycrystalline silicon, a metal oxide, and the like. 
     An ohmic contact member (not shown) may be further formed on the semiconductor  154 . The ohmic contact may be made of a silicide, or a material such as n+ hydrogenated amorphous silicon having a highly doped n-type impurity. 
     A data line  171 , a source electrode  173 , and a drain electrode  175  are formed on the semiconductor  154 . The source electrode  173  is formed protruding from the data line  171 , and the drain electrode  175  is separated from the source electrode  173 . The source electrode  173  and the drain electrode  175  are formed overlapping with the gate electrode  124 . 
     The gate electrode  124 , the source electrode  173 , and the drain electrode  175 , together with the semiconductor  154 , collectively constitute a thin film transistor Q. A channel of the thin film transistor Q is formed between the source electrode  173  and the drain electrode  175 . 
     A passivation layer  180  is formed on the data line  171 , the source electrode  173 , the drain electrode  175 , and on an exposed portion of the semiconductor  154 . A pixel electrode  191  is formed on the passivation layer  180 . The pixel electrode  191  may be made of a transparent metal oxide such as indium tin oxide (ITO) or indium zinc oxide (IZO). 
     The pixel electrode  191  may be generally shaped as a quadrangle. The pixel electrode  191  includes a cross-shaped stem including a horizontal stem portion  193 , and a vertical stem portion  192  crossing the horizontal stem portion  193 . The pixel electrode  191  further includes a micro-branch portion  194  extending from the horizontal stem portion  193  and the vertical stem portion  192 . An extension  197  is formed extending from the quadrangle-shaped pixel electrode  191 . The extension  197  is physically and electrically connected to the drain electrode  175  through a contact hole  185 , so as to receive a data voltage from the drain electrode  175 . 
     The contact hole  185  is formed through the passivation layer  180 . The pixel electrode  191  is connected to the drain electrode  175  through the contact hole  185 . 
     The fourth color pixel area PX(W) is divided into four domains D 1 , D 2 , D 3 , and D 4  by the horizontal stem portion  193  and the vertical stem portion  192  of the pixel electrode  191 . The micro-branch portion  194  extends obliquely from the horizontal stem portion  193  and the vertical stem portion  192 . For example, in the first domain D 1 , the micro-branch portion  194  extends from the horizontal stem portion  193  or the vertical stem portion  192  in an upward and leftward direction. In the second domain D 2 , the micro-branch portion  194  extends from the horizontal stem portion  193  or the vertical stem portion  192  in an upward and rightward direction. In the third domain D 3 , the micro-branch portion  194  extends from the horizontal stem portion  193  or the vertical stem portion  192  in a downward and rightward direction. In the fourth domain D 4 , the micro-branch portion  194  extends from the horizontal stem portion  193  or the vertical stem portion  192  in a downward and leftward direction. 
     Each micro-branch portion  194  may form an angle of about 45 or 135 degrees with respect to the gate line  121  or the horizontal stem portion  193 . The directions in which the micro-branch portions  194  of two adjacent domains (D 1 , D 2 ) and (D 3 , D 4 ) extend may be perpendicular to each other. 
     The pixel electrode  191  may further include an outer stem surrounding an outer circumference of the fourth color pixel area PX(W). 
     The white filter  230 W is formed on the second substrate  210  and disposed facing the first substrate  110 . 
     The light blocking member  220  is formed at an edge of the fourth color pixel area PX(W). The overcoat  240  is formed on the white filter  230 W and the light blocking member  220 . 
     In some embodiments, a cross-section of the white filter  230 W may have a parabolic shape or a semicircular shape. 
     When the liquid crystal display includes the four color filters  230 R,  230 G,  230 B, and  230 W, a first white color can be displayed using a combination of the red filter  230 R, the green filter  230 G, and the blue filter  230 B, and a second white color can be displayed using the white filter  230 W. In some cases, there may be a difference between the first white color and the second white color if the first and second white colors are not well-balanced. 
     Furthermore, when the liquid crystal display is viewed laterally, a light path at the lateral side of the flat white filter  230 W is longer than the light path at the front side of the flat white filter  230 W. Accordingly, a yellowish defect may occur at the lateral side of the flat white filter  230 W. 
     However, when a cross-section of the white filter  230 W has a parabolic shape or a semicircular shape, light path lengths at the lateral and front sides of the white filter  230 W may be adjusted such that the light path lengths are similar each other. Accordingly, the occurrence of the yellowish defect may be prevented. 
     A common electrode  270  is formed on the overcoat  240 . The common electrode  270  may be made of a transparent metal oxide such as indium tin oxide (ITO) or indium zinc oxide (IZO). 
     A predetermined voltage such as a common voltage is applied to the common electrode  270 . When a data voltage is applied to the pixel electrode  191 , an electric field is generated between the pixel electrode  191  and the common electrode  270 , and the liquid crystal molecules  310  of the liquid crystal layer  3  disposed therebetween are arranged in a predetermined direction under the influence of the electric field. 
     Although the above description focuses on the fourth color pixel area PX(W), it is noted that the first, second, or third pixel area PX(R), PX(G), or PX(B) may have a structure similar to that of the fourth color pixel area PX(W). However, unlike the fourth color pixel area PX(W), the red filter  230 R is primarily formed in the first pixel area PX(R), the green filter  230 G is primarily formed in the second pixel area PX(G), the blue filter  230 B is primarily formed in the third pixel area PX(B), and each of the filters  230 R,  230 G, and  230 B may have a rectangular shape. 
     In the above-described embodiments, the color filters  230 R,  230 G,  230 B, and  230 W are disposed on the second substrate  210 . However, the inventive concept is not limited thereto. In some other embodiments, the color filters  230 R,  230 G,  230 B, and  230 W may be disposed on the first substrate  110 , as described below with reference to  FIG. 5 . 
       FIG. 5  is a cross-sectional view of a liquid crystal display according to a second exemplary embodiment. 
     The liquid crystal display according to the exemplary embodiment shown in  FIG. 5  is similar to the exemplary embodiment shown in  FIG. 4  except for the location of the color filters. In the liquid crystal display according to the second exemplary embodiment (shown in  FIG. 5 ), the color filters  230 R,  230 G,  230 B, and  230 W are disposed on the first substrate  110 . In the interest of brevity, a repeat description of the similar elements will be omitted. 
     As shown in  FIG. 5 , a gate electrode  124 , a semiconductor  154 , a source electrode  173 , a drain electrode  175 , and a passivation layer  180  are formed on a first substrate  110 . A white filter  230 W is disposed on the passivation layer  180 . 
     An overcoat  182  is formed on the passivation layer  180  and the white filter  230 W, and a pixel electrode  191  is formed on the overcoat  182 . 
     A contact hole  185  is formed through the passivation layer  180  and the overcoat  182 . The pixel electrode  191  is connected to the drain electrode  175  through the contact hole  185 . 
     A light blocking member  220 , an overcoat  240 , and a common electrode  270  are formed on a second substrate  210 . 
     In some embodiments, a cross-section of the white filter  230 W in  FIG. 5  may have a parabolic shape or a semicircular shape. 
     Next, a liquid crystal display according to third, fourth, and fifth exemplary embodiments of the inventive concept will be described in detail with reference to  FIGS. 6, 7, and 8 . 
       FIG. 6  is a cross-sectional view of a liquid crystal display according to the third exemplary embodiment,  FIG. 7  is a cross-sectional view of a liquid crystal display according to the fourth exemplary embodiment, and  FIG. 8  is a cross-sectional view of a liquid crystal display according to the fifth exemplary embodiment. 
     The liquid crystal display according to the exemplary embodiment shown in  FIG. 6  is similar to the liquid crystal display according to the exemplary embodiment shown in  FIG. 2  except for the shape of the white filter  230 W. Accordingly, a repeat description of the similar elements will be omitted. 
     As shown in  FIG. 6 , the white filter  230 W of the liquid crystal display according to the third exemplary embodiment may be formed having an embossed shape including a convex portion and a concave portion. 
     When the upper surface of the white filter  230 W has a flat surface, a path of light passing through the liquid crystal display from a frontal view may be different from a path of light passing through the liquid crystal display from a lateral view. In the present exemplary embodiment, the light path from the frontal view and the light path from the lateral view of the liquid crystal display may be adjusted to be the same by forming the upper surface of the white filter  230 W in the embossed shape including the convex portion and the concave portion. Accordingly, lateral visibility can be improved. 
     The embossed shape may be formed having a predetermined period, and the period may vary. In the present exemplary embodiment, a shape in which the convex portion and the concave portion are repeatedly arranged along the long sides of the white color pixel area PX(W) is illustrated. However, the inventive concept is not limited thereto. In some other embodiments, the convex portion and the concave portion may be repeatedly arranged along the short sides of the white color pixel area PX(W). In some alternative embodiments, the convex portion and the concave portion may be repeatedly arranged in a matrix form along the long sides and the short sides of the white color pixel area PX(W). 
     The liquid crystal display according to the exemplary embodiment shown in  FIG. 7  is similar to the liquid crystal display of the exemplary embodiment shown in  FIG. 4  except for the shape of the white filter  230 W and the overcoat  182 . Accordingly, a repeat description of the similar elements will be omitted. 
     As shown in  FIG. 7 , in the liquid crystal display according to the fourth exemplary embodiment, a white filter  230 W is formed having a flat surface. A surface of an overcoat  182  may be formed having an embossed shape including a convex portion and a concave portion. The overcoat  182  may be made of an organic layer. 
     In the present exemplary embodiment of  FIG. 7 , a light path from a frontal view and a light path from a lateral view of the liquid crystal display may be adjusted to be the same by forming the upper surface of the overcoat  182  in the embossed shape including the convex portion and the concave portion. Accordingly, lateral visibility can be improved. 
     The embossed shape of the overcoat  182  may be formed having a predetermined period, and the period may be vary. In the present exemplary embodiment, the shape in which the convex portion and the concave portion are repeatedly arranged along the long sides of the white color pixel area PX(W) is illustrated. However, the inventive concept is not limited thereto. In some other embodiments, the convex portion and the concave portion may be repeatedly arranged along the short sides of the white color pixel area PX(W). In some alternative embodiments, the convex portion and the concave portion may be repeatedly arranged in a matrix form along the long sides and the short sides of the white color pixel area PX(W). 
     The liquid crystal display according to the exemplary embodiment shown in  FIG. 8  is similar to the liquid crystal display according to the exemplary embodiment shown in  FIG. 7  except for the shape of the white filter  230 W. Accordingly, a repeat description of the similar elements will be omitted. 
     As shown in  FIG. 8 , in the liquid crystal display according to the fifth exemplary embodiment, the surfaces of a white filter  230 W and an overcoat  182  may be formed having an embossed shape including a convex portion and a concave portion. 
     In the present exemplary embodiment, a light path from a frontal view and a light path from a lateral view of the liquid crystal display may be adjusted to be the same by forming the respective upper surfaces of the white filter  230 W and the overcoat  182  in the embossed shape including the convex portion and the concave portion. Accordingly, lateral visibility can be improved. 
     The embossed shape of the overcoat  182  and the white filter  230 W may be formed having a predetermined period, and the period may vary. In the present exemplary embodiment, the shape in which the convex portion and the concave portion are repeatedly arranged along the long sides of the white color pixel area PX(W) is illustrated. However, the inventive concept is not limited thereto. In some other embodiments, the convex portion and the concave portion may be repeatedly arranged along the short sides of the white color pixel area PX(W). In some alternative embodiments, the convex portion and the concave portion may be repeatedly arranged in a matrix form along the long sides and the short sides of the white color pixel area PX(W). 
     Next, a method of manufacturing the liquid crystal display according to the first exemplary embodiment will be described with reference to  FIGS. 9, 10, and 11 . 
       FIGS. 9, 10, and 11  are cross-sectional views sequentially illustrating the method of manufacturing the liquid crystal display according to the first exemplary embodiment. 
     Referring to  FIG. 9 , a plurality of light blocking members  220  are formed on a second substrate  210 . A red filter  230 R, a green filter  230 G, and a blue filter  230 B are respectively formed in respective pixel areas PX(R), PX(G), and PX(B). Color filters  230 R,  230 G, and  230 B are respectively formed in the first, second, and third color pixel areas PX(R), PX(G), and PX(B), except for the fourth color pixel area PX(W) in which a white filter  230 W is formed. 
     Next, referring to  FIG. 10 , a hydrophilic treatment  20  is performed on a surface of the fourth color pixel area PX(W) in which the white filter  230 W is formed, and a hydrophobic treatment  10  is performed on surfaces of the red filter  230 R and the blue filter  230 B adjacent to the fourth color pixel area PX(W). 
     Next, a white-filter material  235 W is dispensed using a color filter forming nozzle  400 . Specifically, the white-filter material  235 W is dispensed onto the surface of the fourth color pixel area PX(W) on which the hydrophilic treatment  20  is performed, so as to form a white filter  230 W. 
     Referring to  FIG. 11 , the white filter  230 W is not formed at the surfaces of the red filter  230 R and the blue filter  230 B on which the hydrophobic treatment  10  is performed. Instead, the white filter  230 W is formed only on the surface of the fourth color pixel area PX(W) on which the hydrophilic treatment  20  is performed. As a result, a cross-sectional surface of the white filter  230 W may be formed having a parabolic shape due to a characteristic difference between the surface of the fourth color pixel area PX(W) and the surfaces of the red filter  230 R and the blue filter  230 B. 
     It is noted that other processes (that are not illustrated in  FIGS. 9, 10, and 11 ) may be performed using various manufacturing methods known to those skilled in the art, so as to complete the fabrication of the liquid crystal display. 
     According to one or more of the above exemplary embodiment, a yellowish defect may be prevented, good luminance may be achieved, and a visibility difference between the front and lateral surfaces of the liquid crystal display can be improved by changing a shape of a color filter (e.g., white filter) in the liquid crystal display. 
     While the inventive concept has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the inventive concept 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.