Abstract:
A display device for stably attaching a polarizer and preventing contamination of a liquid crystal layer includes: a substrate; a thin film transistor provided on the substrate; a pixel electrode connected to the thin film transistor; a roof layer disposed on the pixel electrode to be spaced apart from the pixel electrode with a plurality of microcavities therebetween; a liquid crystal layer for filling the microcavities; an adhesive member formed on the roof layer and sealing the microcavities; and a first polarizer provided on the adhesive member.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims priority to and the benefit of Korean Patent Application No. 10-2015-0045516 filed in the Korean Intellectual Property Office on Mar. 31, 2015, the entire contents of which are incorporated herein by reference. 
       BACKGROUND 
       [0002]    (a) Technical Field 
         [0003]    The present disclosure relates to a display device. More particularly, the present disclosure relates to a display device for stably attaching a polarizer for preventing contamination of a liquid crystal layer. 
         [0004]    (b) Description of the Related Art 
         [0005]    A liquid crystal display, which is presently a widely used type of flat panel display, includes two substrates with field generating electrodes, such as a pixel electrode and a common electrode, and a liquid crystal layer interposed therebetween. By applying voltages to the field generating electrodes to generate an electric field, the alignment of the liquid crystal molecules of the liquid crystal layer, and thereby the amount of light transmitted by the liquid crystal layer, may be controlled to display an image. 
         [0006]    The two sheets of display panels configuring the liquid crystal display may include a thin film transistor array panel and an opposing display panel. A gate line transferring a gate signal and a data line transferring a data signal are formed to cross each other. A thin film transistor connected with the gate line and the data line, a pixel electrode connected with the thin film transistor, and the like may be formed on the thin film transistor array panel. A light blocking member, a color filter, a common electrode, and the like may be formed on the opposing display panel. In some cases, the light blocking member, the color filter, and the common electrode may be formed on the thin film transistor array panel. 
         [0007]    However, because a liquid crystal display in the related art generally uses two sheets of substrates on which respective constituent elements are formed, the display device tends to be heavy and thick, has a high cost, and has a long processing time. 
         [0008]    The above information disclosed in this Background section is only to enhance the understanding of the background of the present disclosure, 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 
       [0009]    The present disclosure provides a display device manufactured using one substrate, which has the advantages of reduced weight, thickness, cost, and processing time. 
         [0010]    The present disclosure also provides a display device having the advantages of preventing: contamination of a liquid crystal layer when an additional overcoat is formed to seal the liquid crystal layer and a polarizer is attached to the overcoat, an increase in cost caused by an additional process, and peeling of a polarizer. 
         [0011]    An exemplary embodiment of the present disclosure provides a display device including: a substrate; a thin film transistor provided on the substrate; a pixel electrode connected to the thin film transistor; a roof layer disposed on the pixel electrode to be spaced apart from the pixel electrode with a plurality of microcavities therebetween; a liquid crystal layer for filling the microcavities; an adhesive member formed on the roof layer and sealing the microcavities; and a first polarizer provided on the adhesive member. 
         [0012]    The adhesive member may be provided directly on the roof layer. 
         [0013]    The display device may further include an insulating layer provided on the roof layer, wherein the roof layer may be made of an organic material and the insulating layer may be made of an inorganic insulating material. 
         [0014]    The adhesive member may be provided directly on the insulating layer. 
         [0015]    The adhesive member may be made of a pressure-sensitive adhesive (PSA) or a photo-curing adhesive. 
         [0016]    The display device may include a plurality of roof layers, the plurality of roof layers may extend in a first direction, and a first region may be provided among the roof layers. 
         [0017]    The adhesive member may include a first adhesive member provided in the first region and blocking light; and a second adhesive member provided on the roof layer and having transparency. 
         [0018]    The thin film transistor may be provided in the first region, and the first adhesive member may be provided on the thin film transistor. 
         [0019]    A second region may be provided among the microcavities neighboring in the first direction. 
         [0020]    The display device may further include a plurality of color filters provided below the pixel electrode, wherein the color filters may overlap each other in the second region. 
         [0021]    The display device may further include a second polarizer provided below the substrate, wherein the adhesive member may be further provided between the substrate and the second polarizer. 
         [0022]    The display device according to the exemplary embodiment of the present disclosure has the following effects. 
         [0023]    According to the exemplary embodiment of the present disclosure, the display device and the manufacturing method thereof uses a single substrate, thereby reducing weight, thickness, cost, and processing time. 
         [0024]    The overcoat is not formed on the roof layer, but the polarizer is attached thereto, thereby simplifying the process, reducing the cost, attaching the polarizer in a stable manner, and preventing the liquid crystal layer from being contaminated. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0025]      FIG. 1  shows a top plan view of a display device according to an exemplary embodiment of the present disclosure. 
           [0026]      FIG. 2  shows an equivalent circuit diagram of a pixel of a display device according to an exemplary embodiment of the present disclosure. 
           [0027]      FIG. 3  shows a top plan view of part of a display device according to an exemplary embodiment of the present disclosure. 
           [0028]      FIG. 4  shows a cross-sectional view of a display device with respect to a line IV-IV according to an exemplary embodiment of the present disclosure. 
           [0029]      FIG. 5  shows a cross-sectional view of a display device with respect to a line V-V according to an exemplary embodiment of the present disclosure. 
           [0030]      FIG. 6  shows a top plan view of a display device according to an exemplary embodiment of the present disclosure. 
           [0031]      FIG. 7  shows a top plan view of part of a display device according to an exemplary embodiment of the present disclosure. 
           [0032]      FIG. 8  shows a cross-sectional view of a display device with respect to a line VIII-VIII of  FIG. 7  according to an exemplary embodiment of the present disclosure. 
           [0033]      FIG. 9  shows a cross-sectional view of a display device with respect to a line IX-IX of  FIG. 7  according to an exemplary embodiment of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0034]    The present system and method are described more fully hereinafter with reference to the accompanying drawings in which exemplary embodiments of the present system and method are shown. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present disclosure. 
         [0035]    In the drawings, the thickness of layers, films, panels, regions, etc., are 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 directly on the other element, or intervening elements may also be present. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. 
         [0036]    A display device according to an exemplary embodiment of the present disclosure is now described with reference to accompanying drawings. 
         [0037]      FIG. 1  shows a top plan view of a display device according to an exemplary embodiment of the present disclosure. 
         [0038]    The display device includes a substrate  110  made of a material such as glass or plastic. 
         [0039]    A microcavity  305  covered by a roof layer  360  is formed on the substrate  110 . The roof layer  360  extends in a row direction, and a plurality of microcavities  305  are formed below each roof layer  360 . 
         [0040]    The microcavities  305  may be disposed in a matrix format. A first region V 1  is provided between the adjacent microcavities  305  provided in a column direction, and a second region V 2  is provided between the adjacent microcavities  305  provided in a row direction. 
         [0041]    The first region V 1  is provided between adjacent ones of a plurality of roof layers  360 . The microcavities  305  may not be covered by the roof layer  360  but may be exposed to the outside on portions contacting the first region V 1 , which are referred to as injection holes  307   a  and  307   b.    
         [0042]    The injection holes  307   a  and  307   b  are formed on respective edges of the microcavity  305 . The injection holes  307   a  and  307   b  are configured with a first injection hole  307   a  and a second injection hole  307   b.  The first injection hole  307   a  is formed to expose a side of a first edge of the microcavity  305 , and the second injection hole  307   b  is formed to expose a side of a second edge of the microcavity  305 . The side of the first edge of the microcavity  305  faces the side of the second edge. 
         [0043]    The roof layers  360  are respectively formed to be separate from the substrate  110  between adjacent second regions V 2  to form the microcavity  305 . That is, the roof layers  360  are formed to cover sides other than the sides of the first edge and the second edge on which the injection holes  307   a  and  307   b  are formed. 
         [0044]    The configuration of the display device according to an exemplary embodiment of the present disclosure is an example, and various modifications are possible. For example, the dispositions of the microcavity  305 , the first region V 1 , and the second region V 2  are changeable; a plurality of roof layers  360  may be connected to each other in the first region V 1 ; and part of the roof layers  360  may be formed to be separate from the substrate  110  in the second region V 2  in order to connect adjacent microcavities  305 . 
         [0045]    A pixel of a display device according to an exemplary embodiment of the present disclosure is now described with reference to  FIG. 2 . 
         [0046]      FIG. 2  shows an equivalent circuit diagram of a pixel of a display device according to an exemplary embodiment of the present disclosure. 
         [0047]    The display device includes a plurality of signal lines  121 ,  171   h,  and  171   l,  and a pixel PX connected thereto. Although not shown, a plurality of pixels PX may be disposed in a matrix format including a plurality of pixel rows and a plurality of pixel columns. 
         [0048]    Each pixel PX may include a first sub-pixel PXa and a second sub-pixel PXb. The first sub-pixel PXa and the second sub-pixel PXb may be disposed from top to bottom, such as shown in  FIG. 2 . In this case, the first region V 1  may be provided between the first sub-pixel PXa and the second sub-pixel PXb in the pixel row direction, and the second region V 2  may be provided among a plurality of pixel columns. 
         [0049]    The signal lines  121 ,  171   h,  and  171   l  include a gate line  121  for transmitting a gate signal, and a first data line  171   h  and a second data line  171   l  for transmitting different data voltages. 
         [0050]    A first thin film transistor (Qh) is connected to the gate line  121  and the first data line  171   h,  and a second thin film transistor (Ql) is connected to the gate line  121  and the second data line  171   l.    
         [0051]    A first liquid crystal capacitor Clch connected to the first thin film transistor (Qh) is formed on the first sub-pixel PXa, and a second liquid crystal capacitor Clcl connected to the second thin film transistor (Ql) is formed on the second sub-pixel PXb. 
         [0052]    The first thin film transistor (Qh) includes a first terminal connected to the gate line  121 , a second terminal connected to the first data line  171   h,  and a third terminal connected to the first liquid crystal capacitor Clch. 
         [0053]    The second thin film transistor (Ql) includes a first terminal connected to the gate line  121 , a second terminal connected to the second data line  171   l,  and a third terminal connected to the second liquid crystal capacitor Clcl. 
         [0054]    Regarding the operation of a display device according to an exemplary embodiment of the present disclosure, when a gate-on voltage is applied to the gate line  121 , the first thin film transistor (Qh) and the second thin film transistor (Ql) connected thereto are turned on, and the first and second liquid crystal capacitors Clch and Clcl are charged by different data voltages transmitted through the first and second data lines  171   h  and  171   l.  The data voltage transmitted by the second data line  171   l  is less than the data voltage transmitted by the first data line  171   h.  Therefore, the second liquid crystal capacitor Clcl is controlled to be charged with a lower voltage than the first liquid crystal capacitor Clch to improve lateral visibility. 
         [0055]    The present disclosure, however, is not limited thereto, and a disposition design on the thin film transistors for applying different voltages to the two sub-pixels PXa and PXb are modifiable in various ways. The pixel PX may include a plurality of sub-pixels or may be configured with one pixel. 
         [0056]    A configuration of one pixel of a display device according to an exemplary embodiment of the present disclosure is now described with reference to  FIG. 3  to  FIG. 5 . 
         [0057]      FIG. 3  shows a top plan view of part of a display device according to an exemplary embodiment of the present disclosure.  FIG. 4  shows a cross-sectional view of a display device with respect to a line IV-IV according to an exemplary embodiment of the present disclosure.  FIG. 5  shows a cross-sectional view of a display device with respect to a line V-V according to an exemplary embodiment of the present disclosure. 
         [0058]    Referring to  FIG. 3  to  FIG. 5 , a gate line  121  and a first gate electrode  124   h  and a second gate electrode  124   l  that protrude from the gate line  121  are formed on the substrate  110 . 
         [0059]    The gate line  121  extends in a first direction and transmits a gate signal. The gate line  121  is provided between two adjacent microcavities  305  provided in the column direction. That is, the gate line  121  is provided in the first region V 1 . The first gate electrode  124   h  and the second gate electrode  124   l  protrude to an upper side of the gate line  121  with respect to the floor plan view of  FIG. 3 . The first gate electrode  124   h  may be connected to the second gate electrode  124   l  to form a protrusion. The present disclosure is not limited thereto, and the first gate electrode  124   h  and the second gate electrode  124   l  may be modified to protrude in various ways. 
         [0060]    A reference voltage line  131  and storage electrodes  133  and  135  protruding from the reference voltage line  131  may be further formed on the substrate  110 . 
         [0061]    The reference voltage line  131  extends parallel to the gate line  121  and is formed to be separate from the gate line  121 . A predetermined voltage may be applied to the reference voltage line  131 . The storage electrode  133  protruding over the reference voltage line  131  is formed to surround an edge of the first sub-pixel PXa. The storage electrode  135  protrudes below the reference voltage line  131  and is formed to be adjacent to the first gate electrode  124   h  and the second gate electrode  124   l.  The storage electrode  135  protruding below the reference voltage line  131  overlaps a first drain electrode  175   h  and a second drain electrode  175   l,  which are described below. 
         [0062]    A gate insulating layer  140  is formed on the gate line  121 , the first gate electrode  124   h,  the second gate electrode  124   l,  the reference voltage line  131 , and the storage electrodes  133  and  135 . The gate insulating layer  140  may be formed of an inorganic insulating material such as a silicon nitride (SiNx) or a silicon oxide (SiOx). In addition, the gate insulating layer  140  may be formed to be a single layer or multiple layers. 
         [0063]    A first semiconductor  154   h  and a second semiconductor  154   l  are formed on the gate insulating layer  140 . The first semiconductor  154   h  may be provided on the first gate electrode  124   h,  and the second semiconductor  154   l  may be provided on the second gate electrode  124   l.  The first semiconductor  154   h  may be provided below the first data line  171   h,  and the second semiconductor  154   l  may be provided below the second data line  171   l.  The first semiconductor  154   h  and the second semiconductor  154   l  may be formed of amorphous silicon, polycrystalline silicon, or a metal oxide. 
         [0064]    An ohmic contact (not shown) may be further formed on the first semiconductor  154   h  and the second semiconductor  154   l.  The ohmic contact may be made of a material such as a silicide or n+ hydrogenated amorphous silicon to which a highly concentrated n-type impurity is doped. 
         [0065]    A first data line  171   h,  a second data line  171   l,  a first source electrode  173   h,  a first drain electrode  175   h,  a second source electrode  173   l,  and a second drain electrode  175   l  are formed on the first semiconductor  154   h,  the second semiconductor  154   l,  and the gate insulating layer  140 . 
         [0066]    The first data line  171   h  and the second data line  171   l  transmit a data signal and extend in a second direction to cross the gate line  121  and the reference voltage line  131 . The data line  171  is provided between the two adjacent microcavities  305  provided in the row direction. That is, the data line  171  is provided in the second region V 2 . 
         [0067]    The first data line  171   h  and the second data line  171   l  transmit different data voltages. For example, the data voltage transmitted by the second data line  171   l  may be lower than the data voltage transmitted by the first data line  171   h.    
         [0068]    The first source electrode  173   h  is formed to protrude over the first gate electrode  124   h  from the first data line  171   h,  and the second source electrode  173   l  is formed to protrude over the second gate electrode  124   l  from the second data line  171   l.  The first drain electrode  175   h  and the second drain electrode  175   l  respectively include a wide first end and a bar-type second end. The wide first ends of the first drain electrode  175   h  and the second drain electrode  175   l  overlap the storage electrode  135  protruding below the reference voltage line  131 . The bar-type second ends of the first drain electrode  175   h  and the second drain electrode  175   l  are partly surrounded by the first source electrode  173   h  and the second source electrode  173   l.  The first and second gate electrodes  124   h  and  124   l,  the first and second source electrodes  173   h  and  173   l,  and the first and second drain electrodes  175   h  and  175   l  form first and second thin film transistors (TFTs) Qh and Ql together with the first and second semiconductors  154   h  and  154   l,  respectively. The thin film transistors include channels formed on the semiconductors  154   h  and  154   l  between the source electrodes  173   h  and  173   l  and the drain electrodes  175   h  and  175   l.    
         [0069]    A passivation layer  180  is formed on the first semiconductor  154   h  exposed between the first source electrode  173   h  and the first drain electrode  175   h,  on the first source electrode  173   h,  on the first drain electrode  175   h,  on the second semiconductor  154   l  exposed between the second source electrode  173   l  and the second drain electrode  175   l,  on the second source electrode  173   l,  on the second drain electrode  175   l,  on the first data line  171   h,  and the second data line  171   l.  The passivation layer  180  may be formed of an organic insulating material or an inorganic insulating material, and may be formed to be a single layer or multiple layers. 
         [0070]    A color filter  230  is formed in the pixel PX on the passivation layer  180 . 
         [0071]    The color filter  230  may express one of three primary colors, such as red, green, and blue. The color filter  230  may also express cyan, magenta, yellow, or a white based color and not be limited to the three primary colors. The color filter  230  is not formed in the first region V 1  and/or the second region V 2 . 
         [0072]    A light blocking member  220  is formed in a region between neighboring color filters  230 . The light blocking member  220  may be formed on a border of the pixel PX and the thin film transistors Qh and Ql to prevent light leakage. That is, the light blocking member  220  may be formed in the first region V 1  and the second region V 2 . The color filter  230  may overlap the light blocking member  220  in part of a region. 
         [0073]    A first insulating layer  240  may be further formed on the color filter  230  and the light blocking member  220 . The first insulating layer  240  may be formed of an organic insulating material and create a flat surface on upper sides of the color filter  230  and the light blocking member  220 . 
         [0074]    A second insulating layer  250  may be further formed on the first insulating layer  240 . The second insulating layer  250  may be formed of an inorganic insulating material. 
         [0075]    A first contact hole  181   h  for exposing a wide end portion of the first drain electrode  175   h  and a second contact hole  181   l  for exposing a wide end portion of the second drain electrode  175   l  are formed on the passivation layer  180 , the first insulating layer  240 , and the second insulating layer  250 . 
         [0076]    A pixel electrode  191  is formed on the second insulating layer  250 . The pixel electrode  191  may be made of a transparent metal oxide such as an indium tin oxide (ITO) or an indium zinc oxide (IZO). 
         [0077]    The pixel electrode  191  may include a first sub-pixel electrode  191   h  and a second sub-pixel electrode  191   l,  which are separated from each other with the gate line  121  and the reference voltage line  131  therebetween. The first sub-pixel electrode  191   h  and the second sub-pixel electrode  191   l  are disposed from top to bottom with respect to the gate line  121  and the reference voltage line  131  on the floor plan view of  FIG. 3 . That is, the first sub-pixel electrode  191   h  is separated from the second sub-pixel electrode  191   l  with the first region V 1  therebetwen, the first sub-pixel electrode  191   h  is provided on the first sub-pixel PXa, and the second sub-pixel electrode  191   l  is provided on the second sub-pixel PXb. 
         [0078]    The first sub-pixel electrode  191   h  is connected to the first drain electrode  175   h  through the first contact hole  181   h,  and the second sub-pixel electrode  191   l  is connected to the second drain electrode  175   l  through the second contact hole  181   l.  Therefore, when the first thin film transistor (Qh) and the second thin film transistor (Ql) are turned on, the first sub-pixel electrode  191   h  and the second sub-pixel electrode  191   l  receive different data voltages from the first drain electrode  175   h  and second drain electrode  175   l.    
         [0079]    The first sub-pixel electrode  191   h  and the second sub-pixel electrode  191   l  are quadrangular, and the first sub-pixel electrode  191   h  and the second sub-pixel electrode  191   l  include cross-shaped stems, including horizontal stems  193   h  and  193   l,  and vertical stems  192   h  and  192   l  crossing the horizontal stems  193   h  and  193   l.  The first sub-pixel electrode  191   h  and the second sub-pixel electrode  191   l  respectively include a plurality of fine branches  194   h  and  194   l.    
         [0080]    Each of the sub-pixel electrodes  191   h  and  191   l  is divided into four sub-regions by the horizontal stems  193   h  and  193   l  and the vertical stems  192   h  and  192   l.  The fine branches  194   h  and  194   l  obliquely extend from the horizontal stems  193   h  and  193   l  and the vertical stems  192   h  and  192   l,  and the extending direction may form an angle of substantially 45 or 135 degrees with respect to the gate line  121  or the horizontal stems  193   h  and  193   l.  The fine branches  194   h  and  194   l  of two neighboring sub-regions may extend to be perpendicular to each other. 
         [0081]    In the present exemplary embodiment, the first sub-pixel electrode  191   h  and the second sub-pixel electrode  191   l  may further include an external stem for surrounding external sides of the first sub-pixel PXa and the second sub-pixel PXb. 
         [0082]    The above-described disposition and form of the pixel, the configuration of the thin film transistor, and the form of the pixel electrode are exemplary. Thus the present disclosure is not limited thereto, and various modifications are possible. 
         [0083]    A common electrode  270  is formed on the pixel electrode  191  so that it may be separated from the pixel electrode  191  by a predetermined distance. A microcavity  305  is formed between the pixel electrode  191  and the common electrode  270   
         [0084]    That is, the microcavity  305  is sandwiched by the pixel electrode  191  and the common electrode  270 . The common electrode  270  extends in the row direction and is formed over the microcavity  305  and in the second region V 2 . The common electrode  270  is formed to cover part of an upper side and a lateral side of the microcavity  305 . The size of the microcavity  305  may vary in many ways according to the size and resolution of the display device. 
         [0085]    The present disclosure is not limited thereto, and an insulation layer may be formed between the common electrode  270  and the pixel electrode  191 . 
         [0086]    The microcavity  305  may be formed on the common electrode  270 . 
         [0087]    The common electrode  270  may be made of a transparent metal oxide such as an indium tin oxide (ITO) or an indium zinc oxide (IZO). A predetermined voltage may be applied to the common electrode  270  so that an electric field may be formed between the pixel electrode  191  and the common electrode  270 . 
         [0088]    Alignment layers  11  and  21  are formed above the pixel electrode  191  and below the common electrode  270   
         [0089]    The alignment layers  11  and  21  include a first alignment layer  11  and a second alignment layer  21 . The first alignment layer  11  and the second alignment layer  21  may be formed with vertical alignment layers, and may be made of an alignment material such as polyamic acid, polysiloxane, or polyimide. The first and second alignment layers  11  and  21  may be connected on a side wall at an edge of the microcavity  305 . 
         [0090]    The first alignment layer  11  is formed on the pixel electrode  191 . The first alignment layer  11  may be formed directly on the second insulating layer  250  not covered by the pixel electrode  191 . The first alignment layer  11  may also be formed in the first region V 1 . 
         [0091]    The second alignment layer  21  is formed below the common electrode  270  so that it may face the first alignment layer  11 . 
         [0092]    A liquid crystal layer formed with liquid crystal molecules  310  is formed in the microcavity  305  provided between the pixel electrode  191  and the common electrode  270 . The liquid crystal molecules  310  may have negative dielectric anisotropy and may stand vertically with respect to the substrate  110  when the electric field is not applied. That is, a vertical alignment may be performed. 
         [0093]    The first sub-pixel electrode  191   h  and the second sub-pixel electrode  191   l  to which the data voltage is applied generate the electric field with the common electrode  270  to determine a direction of the liquid crystal molecules  310  provided in the microcavity  305  between the electrodes  191  and  270 . Luminance of light passing through the liquid crystal layer is changed by the determined direction of the liquid crystal molecules  310 . 
         [0094]    A third insulating layer  350  may be formed on the common electrode  270 . The third insulating layer  350  may be formed with an inorganic insulating material such as silicon nitride (SiNx) or silicon oxide (SiOx) and may be omitted in certain cases. 
         [0095]    A roof layer  360  is formed on the third insulating layer  350 . The roof layer  360  may be made of an organic material. The roof layer  360  is formed to extend in a row direction, and is formed over the microcavity  305  and in the second region V 2 . The roof layer  360  is formed to cover part of the upper side and the lateral side of the microcavity  305 . The roof layer  360  is made hard, such as by a curing process, to maintain the form of the microcavity  305 . The roof layer  360  is formed to be separate from the pixel electrode  191  with the microcavity  305  therebetween. 
         [0096]    The common electrode  270  and the roof layer  360  are formed to not cover part of the lateral side at the edge of the microcavity  305 . The portions of the microcavity  305  that are not covered by the common electrode  270  and the roof layer  360  are referred to as injection holes  307   a  and  307   b.  The injection holes  307   a  and  307   b  consist of a first injection hole  307   a  for exposing a lateral side at the first edge of the microcavity  305  and a second injection hole  307   b  for exposing a lateral side at the second edge of the microcavity  305 . The first edge faces the second edge. For example, the first edge may be an upper edge of the microcavity  305  and the second edge may be a lower edge of the microcavity  305 , as shown by the floor plan view o.  FIG. 1 . The microcavity  305  is exposed by the injection holes  307   a  and  307   b  in the process of manufacturing a display device so that an aligning agent and/or a liquid crystal material may be injected into the microcavity  305  through the injection holes  307   a  and  307   b.    
         [0097]    A fourth insulating layer  370  may be further formed on the roof layer  360 . The fourth insulating layer  370  may be made of an inorganic insulating material such as a silicon nitride (SiNx) or a silicon oxide (SiOx). The fourth insulating layer  370  may be formed to cover the upper side and/or the lateral side of the roof layer  360 . The fourth insulating layer  370  protects the roof layer  360  made of an organic material and may be omitted in certain cases. 
         [0098]    An adhesive member  500  is formed on the fourth insulating layer  370 . The adhesive member  500  is formed to cover the injection holes  307   a  and  307   l  that expose part of the microcavity  305 . That is, the adhesive member  500  may seal the microcavity  305  so that the liquid crystal molecules  310  formed inside the microcavity  305  cannot escape. 
         [0099]    The adhesive member  500  is provided directly on the fourth insulating layer  370 . The fourth insulating layer  370  may be omitted in certain cases, and in those cases, the adhesive member  500  is provided directly on the roof layer  360 . 
         [0100]    The adhesive member  500  may be made of a pressure-sensitive adhesive (PSA) or a photo-curing adhesive. 
         [0101]    The pressure-sensitive adhesive includes, for example, an adhesive in which an adhesive action occurs when a pressure for adhering the adhesive to an adhering surface is applied. No solvent, water, or heat is needed to activate the adhesive. The strength of the pressure-sensitive adhesive is influenced by the amount of pressure with which the adhesive is applied to the surface. The pressure-sensitive adhesive is manufactured to maintain appropriate adherence and sustainability at room temperature. However, adherence may be lost or reduced at a low temperature, and a pre-stage resistance may be reduced at a high temperature. There are adhesives that operate normally at low or high temperatures. 
         [0102]    The photo-curing adhesive includes, for example, an adhesive that maintains liquidity when it is not exposed to light and begins a curing reaction when light is irradiated thereto. The photo-curing adhesive may be an ultraviolet ray curing adhesive or a visible light curing adhesive according to a wavelength of the exposed light. The ultraviolet ray curing adhesive begins the curing reaction when ultraviolet rays are irradiated, and the visible light curing adhesive begins the curing reaction when visible light is irradiated. The photo-curing adhesive excels in interface adherence and vapor transmission resistance. Therefore, adherence to the roof layer  360  or the fourth insulating layer  370  may be improved, and no inflow of moisture into the microcavity  305  may be possible. 
         [0103]    Because the adhesive member  500  contacts the liquid crystal molecule  310 , it the adhesive member  500  may be formed with a material that does not react to the liquid crystal molecules  310 . The pressure-sensitive adhesive and the photo-curing adhesive, for example, are gel-type and high-viscosity materials that do not generate a reaction when contacting the liquid crystal molecules  310 . 
         [0104]    A first polarizer  22  is provided on the adhesive member  500 . The first polarizer  22  is fixed to the roof layer  360  by the adhesive member  500 . 
         [0105]    A second polarizer  12  may be further provided below the substrate  110 . The adhesive member  500  may also be provided between the substrate  110  and the second polarizer  12 . The second polarizer  12  is fixed below the substrate  110  by the adhesive member  500 . 
         [0106]    A display device according to an exemplary embodiment of the present disclosure is now described with reference to  FIG. 6  to  FIG. 9 . 
         [0107]    Many parts of the display device shown in  FIG. 6  to  FIG. 9  correspond to the display device shown in  FIG. 1  to  FIG. 5 , and thus such parts are not described again here. The adhesive member is made of two materials in the present exemplary embodiment, however, which is different from the previous exemplary embodiment, and thus is now described. 
         [0108]      FIG. 6  shows a top plan view of a display device according to an exemplary embodiment of the present disclosure.  FIG. 7  shows a top plan view of part of a display device according to an exemplary embodiment of the present disclosure.  FIG. 8  shows a cross-sectional view of a display device with respect to a line VIII-VIII of  FIG. 7  according to an exemplary embodiment of the present disclosure.  FIG. 9  shows a cross-sectional view of a display device with respect to a line IX-IX of  FIG. 7  according to an exemplary embodiment of the present disclosure. 
         [0109]    In the present exemplary embodiment, the adhesive member  500  includes a first adhesive member  510  and a second adhesive member  520 . The first adhesive member  510  is provided in the first region V 1 , and the second adhesive member  520  is provided in a region other than the first region V 1 . Therefore, the first adhesive member  510  is provided on the first alignment layer  11  and the second insulating layer  250  in the first region V 1 . The second adhesive member  520  is provided on the roof layer  360  and the fourth insulating layer  370 . 
         [0110]    The first adhesive member  510  is made of a light blocking material. The first adhesive member  510  is formed on the thin film transistor provided in the first region V 1  to prevent light leakage. Hence, the light leakage may be prevented without forming an additional light blocking member in the first region V 1 , and thus the process may be simplified, and the cost may be reduced. 
         [0111]    The light leakage may be prevented in the second region V 2  by allowing a plurality of color filters in a neighboring pixel area PX to overlap each other. Hence, the light leakage may be prevented without forming an additional light blocking member in the second region V 2 , and thus the process may be simplified, and the cost may be reduced. 
         [0112]    The second adhesive member  520  is made of a transparent material. The second adhesive member  520  overlaps the liquid crystal layer, and the light that passes through the liquid crystal layer also passes through the second adhesive member  520  and then the first polarizer  22  and displays a screen image. 
         [0113]    It has been described that the first adhesive member  510  for blocking light is provided in the first region V 1 , and a second adhesive member  520  with transparency is provided in another region, but the present disclosure is not limited thereto. The first adhesive member  510  with transparency may be provided in the first region V 1  and the second region V 2 . In this case, the second adhesive member  520  is provided in a region other than the first region V 1  and the second region V 2 . 
         [0114]    While the present system and method have been described in connection with exemplary embodiments, it is to be understood that the present system and method are not limited to the disclosed embodiments. On the contrary, the present system and method cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.