KR20150101930A - Curved display device and manufacturing method of curved display device - Google Patents

Abstract

A curved display device includes a first substrate, a second substrate, a liquid crystal layer, a first alignment layer, and a second alignment layer. The second substrate faces the first substrate. The liquid crystal layer is formed between the first substrate and the second substrate, and includes liquid crystal molecules. The first alignment layer includes polymerized reactive mesogens, and is formed between the first substrate and the liquid crystal layer. The second alignment layer is formed between the liquid crystal layer and the second substrate. The reactive mesogen includes a functional group with charge. According to the curved display device, display quality can be enhanced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved display device and a curved display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved display device and a method of manufacturing a curved display device, and more particularly, to a curved display device and a method of manufacturing a curved display device including pixels having a plurality of domains defined therein.

Flat panel displays are used for displaying images on various information processing devices such as TVs, monitors, notebooks, and mobile phones. In recent years, a curved display device having a curved shape has been developed. The curved display device provides a display area having a shape of a curved surface, thereby providing a user with an improved stereoscopic effect, an immersive feeling, and a sense of touch.

An object of the present invention is to provide a curved display device with improved display quality.

It is another object of the present invention to provide a method of manufacturing a curved display device with improved display quality.

A curved display device according to an embodiment of the present invention includes a first substrate, a second substrate, a liquid crystal layer, a first alignment layer, and a second alignment layer. The second substrate faces the first substrate. The liquid crystal layer is formed between the first substrate and the second substrate and includes liquid crystal molecules. The first alignment layer includes polymerized reactive mesogens and is formed between the first substrate and the liquid crystal layer. And the second alignment film is formed between the liquid crystal layer and the second substrate. The reactive mesogen has a functional group having a charge.

The curved display device may be flexible.

The functional group may have a positive charge.

The functional group may include an alkali metal ion.

The functional group may have a negative charge.

The functional group may include halogen ions.

The first substrate includes a first base substrate; A color filter formed on the first base substrate, and a black matrix formed on the first base substrate.

A method of manufacturing a curved display device according to an embodiment of the present invention includes the steps of providing a first substrate, providing a second substrate facing the first substrate, providing a gap between the first substrate and the second substrate , Providing a liquid crystal composition comprising liquid crystal molecules and reactive mesogens having functional groups with charge and providing a light and an electric field to the liquid crystal composition to form a first alignment layer on the first substrate do.

The method of manufacturing a curved display device according to an embodiment of the present invention may further include the step of providing a power source unit including a first electrode unit connected to the first substrate and a second electrode unit connected to the second substrate .

The functional group may have a positive charge.

Forming the first alignment layer includes applying a first voltage to the first electrode portion and applying a second voltage higher than the first voltage to the second electrode portion to apply an electric field to the liquid crystal composition .

The forming of the first alignment layer may include applying a negative voltage to the first electrode portion and grounding the second electrode portion to apply an electric field to the liquid crystal composition.

The forming of the first alignment layer may include grounding the first electrode portion and applying a positive voltage to the second electrode portion to apply an electric field to the liquid crystal composition.

The functional groups may include alkali metal ions.

The functional group may have a negative charge.

Forming the first alignment layer includes applying a third voltage to the first electrode portion and applying a fourth voltage lower than the third voltage to the second electrode portion to apply an electric field to the liquid crystal layer .

The forming of the first alignment layer may include applying a positive voltage to the first electrode portion and grounding the second electrode portion to apply an electric field to the liquid crystal composition.

The forming of the first alignment layer may include grounding the first electrode portion and applying a negative voltage to the second electrode portion to apply an electric field to the liquid crystal composition.

The functional group may include halide ions.

A curved display device according to an embodiment of the present invention includes a curved second substrate, a curved second substrate, a liquid crystal layer, a first alignment layer, and a second alignment layer. The second substrate faces the first substrate. The liquid crystal layer is provided between the first substrate and the second substrate and includes liquid crystal molecules. The first alignment layer includes reactive mesogens polymerized with each other and is provided between the first substrate and the liquid crystal layer. And the second alignment film is provided between the second substrate and the liquid crystal layer. The first liquid crystal molecules adjacent to the first alignment layer among the liquid crystal molecules have a first angle of incidence. And the second liquid crystal molecules adjacent to the second alignment layer among the liquid crystal molecules have a second pre-scan square different from the first pre-scan square.

The first pre-scan angle may be 80 ° to 90 °.

The second angle of pre-scan may be 88 ° to 90 °.

The first alignment layer includes a first base layer and a first alignment layer. The first base layer is provided on the first substrate. Wherein the first alignment layer is provided in the first base layer and comprises the polymerized reactive mesogens. The first substrate has a first radius of curvature, and the second substrate has a first radius of curvature different from the first radius of curvature. 2 radius of curvature.

The first substrate includes a first base substrate and pixel electrodes provided on the first base substrate. The second substrate includes a second base substrate; And a common electrode provided on the second base substrate and facing the pixel electrode.

The pixel electrode may include a stripe portion and a plurality of branches extending from the stripe portion.

A curved display device according to an embodiment of the present invention further includes pixels including a plurality of domains. The domains may be separated by the stem base.

The branches may extend in parallel to each other within each of the domains, and may extend in different directions for each of the domains.

The domains may include a first domain, a second domain, a third domain, and a fourth domain.

The curved display device according to an embodiment of the present invention further includes a first polarizer and a second polarizer. The first polarizing plate is provided below the first substrate and has a first transmission axis. The second polarizing plate is provided on the second substrate and has a second transmission axis. The direction of the first transmission axis and the direction of the second transmission axis may be orthogonal to each other.

According to the curved display device according to an embodiment of the present invention, the texture defect can be reduced by providing light in various directions along a plurality of domains defined in a pixel.

According to the method of manufacturing a curved display device according to an embodiment of the present invention, it is possible to provide a curved display device with improved display quality.

1A and 1B are perspective views schematically showing a curved display device according to an embodiment of the present invention.
2 is a cross-sectional view schematically showing a curved display device according to an embodiment of the present invention.
3 is a plan view schematically illustrating one pixel of the pixels included in the curved display device according to the embodiment of the present invention.
4 is a cross-sectional view corresponding to line I-I 'in Fig.
5A is a perspective view schematically showing a first square of the first liquid crystal molecules.
And FIG. 5B is a perspective view schematically showing a second square of the second liquid crystal molecules.
6A is a perspective view schematically showing a curved display device according to an embodiment of the present invention.
6B is a perspective view schematically illustrating a pixel, a first alignment layer and a second alignment layer corresponding to a pixel according to an embodiment of the present invention.
6C is a plan view schematically showing the first alignment layer when viewed in the DR5 direction of FIG. 6B.
FIG. 6D is a plan view schematically showing the second alignment layer when viewed in the DR5 direction of FIG. 6B.
FIG. 6E is a plan view schematically showing the overlap region, the lower polarizer and the upper polarizer of the first and second alignment films when viewed in the DR3 direction of FIG. 6B.
FIG. 6F is a schematic view of a user recognizing an image displayed on a curved display device according to an exemplary embodiment of the present invention.
7A is a perspective view schematically showing a curved display device according to a comparative example.
7B is a perspective view schematically showing a pixel included in a curved display device according to a comparative example, a first alignment film corresponding to a pixel, and a second alignment film.
FIG. 7C is a plan view schematically showing the first alignment layer when viewed in the DR5 direction in FIG. 7B. FIG.
7D is a plan view schematically showing the second alignment layer when viewed in the DR5 direction of FIG. 7B.
FIG. 7E is a plan view schematically showing the overlap region of the first alignment film and the second alignment film in the DR3 direction in FIG. 7B. FIG.
8 is a flowchart schematically showing a method of manufacturing a curved display device according to an embodiment of the present invention.
9, 10 and 11 are sectional views sequentially illustrating a method of manufacturing a curved display device according to an embodiment of the present invention.
12 is a cross-sectional view showing one step of a method of manufacturing a curved display device according to an embodiment of the present invention, corresponding to FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more readily apparent from the following description of preferred embodiments with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art.

Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are shown enlarged from the actual for the sake of clarity of the present invention. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, where a section such as a layer, a film, an area, a plate, or the like is referred to as being "on" another section, it includes not only the case where it is "directly on" another part but also the case where there is another part in between. On the contrary, where a section such as a layer, a film, an area, a plate, etc. is referred to as being "under" another section, this includes not only the case where the section is "directly underneath"

Hereinafter, a curved display device according to an embodiment of the present invention will be described.

1A is a perspective view schematically showing a curved display device according to an embodiment of the present invention. 1B is a perspective view schematically showing a curved display device according to an embodiment of the present invention. 2 is a cross-sectional view schematically showing a curved display device according to an embodiment of the present invention.

1A, 1B and 2, a curved display device 10 includes a first substrate SUB1, a second substrate SUB2, and a liquid crystal layer LCL. The liquid crystal layer LCL is provided between the first substrate SUB1 and the second substrate SUB2.

The curved display device 10 displays an image. The curved display device 10 includes a display area DA for displaying an image and a non-display area NDA for not displaying an image.

The display area DA may have a substantially rectangular shape when viewed in the thickness direction DR3 of the curved display device 10, but the present invention is not limited thereto. The thickness direction DR3 may be the front direction of the curved display device 10 for the user.

The display area DA includes a plurality of pixel areas PXL. The pixel regions PXL may be defined by, for example, a plurality of gate lines GL and a plurality of data lines DL. The pixel regions PXL may be arranged in a matrix form. A pixel PX (see FIG. 3) may be disposed in each of the pixel regions PXL.

When viewed in the thickness direction DR3 of the curved display device 10, the non-display area NDA can surround the display area DA, for example. The non-display area NDA may be adjacent to the display area DA in a first direction DR1 and a second direction DR2 perpendicular to the first direction DR1.

The curved display device 10 may be curved with a predetermined curvature / radius of curvature. The curved display device 10 may be flexible or rigid.

The curved display device 10 may be a concave curved shape when the user looks at the curved display device 10. When the user views the image displayed on the curved surface, the user can feel improved stereoscopic feeling, immersion feeling, and sense of urgency. 1A and 1B illustrate that the curved display device 10 has a concave shape when viewed in the thickness direction DR3 of the curved display device 10. However, the present invention is not limited to this, When viewed in the thickness direction DR3 of the display device 10, the curved display device 10 may have a convex shape. The user of the curved display device 10 can view the image displayed on the curved surface.

The first substrate SUB1 may be curved. The first substrate SUB1 may have a first radius of curvature R1. The second substrate SUB2 may also be curved. And the second substrate SUB2 may have a second radius of curvature R2.

3 is a plan view schematically illustrating one pixel of the pixels included in the curved display device according to the embodiment of the present invention. In Fig. 3, one pixel is shown, and the structure of each of the remaining pixels may be similar to that of the pixel shown in Fig. 4 is a cross-sectional view corresponding to line I-I 'in Fig. 3 and 4 may be exaggerated and enlarged or reduced for convenience of illustration.

The curved display device 10 includes a first substrate SUB1, a first alignment layer ALN1 provided on the first substrate SUB1, a first alignment layer ALN1 provided on the first substrate SUB1, A second alignment film ALN2 provided on the second substrate SUB2 and a liquid crystal layer LCL provided between the first alignment film ALN1 and the second alignment film ALN2, .

The first substrate SUB1 includes a first base substrate BS1, a color filter layer CF, a black matrix BM, gate lines GL, data lines DL and a plurality of pixels PX can do.

In FIG. 3, for convenience of description, one pixel connected to one of the gate lines GL and the data lines DL is shown. However, the present invention is not limited to this, and one gate line, one data line and a plurality of pixels may be connected, and a plurality of gate lines and a plurality of data lines may be connected to one pixel. Hereinafter, one pixel PX will be mainly described.

The first base substrate BS1 may be a polymer substrate, a plastic substrate, a glass substrate, a quartz substrate, or the like. The first base substrate BS1 may be a transparent insulating substrate. The first base substrate BS1 may be flexible and may be rigid.

The color filter CF is provided on the first base substrate BS1 and provides color. The color filter CF is not limited to the first substrate SUB1 but may be formed on the second substrate SUB2 instead of the first substrate SUB1, ).

The black matrix BM is formed corresponding to the light shielding region of the first substrate SUB1. The light shielding region may be defined as an area where the data lines DL, the thin film transistors TFT, and the gate lines GL are formed. Since the pixel electrode PE is not normally formed in the light shielding region, the liquid crystal molecules may not be aligned and light leakage may occur. Accordingly, the black matrix BM is formed in the light shielding region to block the light leakage. The black matrix BM is not limited to the first substrate SUB1 but may be formed on the second substrate SUB2 instead of the first substrate SUB1, ).

Although not shown, an insulating layer (not shown) may be formed on the color filter CF and the black matrix BM.

The gate line GL is formed extending in the first direction DR1 on the color filter CF and the black matrix BM. In an embodiment of the present invention, the gate lines GL, the data lines DL, and the thin film transistors TFT are formed on the color filters CF and the black matrix BM. However, the present invention is not limited thereto, A color filter CF and a black matrix BM may be provided on the gate lines GL, the data lines DL and the thin film transistors TFT.

The data lines DL are provided extending in the second direction DR2 crossing the first direction DR1 with the gate line GL and the gate insulating film GI therebetween. A gate insulating film GI is provided on the front surface of the first base substrate BS1 and covers the gate lines GL.

The pixel PX includes a thin film transistor TFT and a pixel electrode PE connected to the thin film transistor TFT and a storage electrode portion. The thin film transistor TFT includes a gate electrode GE, a gate insulating film GI, a semiconductor pattern SM, a source electrode SE and a drain electrode DE. The storage electrode unit includes a storage line SLn extending in the first direction DR1, a first branch electrode LSLn and a second branch electrode RSLn, which branch from the storage line SLn and extend in the second direction DR2, ).

The gate electrode GE protrudes from the gate lines GL or is provided on a part of the gate lines GL. The gate electrode GE may be made of metal. The gate electrode GE may be made of nickel, chromium, molybdenum, aluminum, titanium, copper, tungsten, and alloys thereof. The gate electrode GE may be formed of a single film or multiple films using a metal. For example, the gate electrode GE can be a triple film in which molybdenum, aluminum, and molybdenum are sequentially laminated, or a double film in which titanium and copper are sequentially laminated. Or a single film of an alloy of titanium and copper.

The semiconductor pattern SM is provided on the gate insulating film GI. The semiconductor pattern SM is provided on the gate electrode GE via the gate insulating film GI. The semiconductor pattern SM partially overlaps with the gate electrode GE. The semiconductor pattern SM includes an active pattern (not shown) provided on the gate insulating film GI and an ohmic contact layer (not shown) formed on the active pattern. The active pattern may be formed of an amorphous silicon thin film, and the ohmic contact layer may be formed of an n + amorphous silicon thin film. The ohmic contact layer makes ohmic contact between the active pattern and the source electrode SE and the drain electrode DE, respectively.

The source electrode SE is provided branched in the data line DL. A source electrode SE is formed on the ohmic contact layer, and a part of the source electrode SE overlaps the gate electrode GE. The drain electrode DE is provided apart from the source electrode SE via the semiconductor pattern SM. A drain electrode DE is formed on the ohmic contact layer and a portion of the drain electrode DE is provided so as to overlap with the gate electrode GE.

The source electrode SE and the drain electrode DE may be formed of nickel, chromium, molybdenum, aluminum, titanium, copper, tungsten, or an alloy containing them. The source electrode SE and the drain electrode DE may be formed of a single film or multiple films using a metal. For example, the source electrode SE and the drain electrode DE may be a double film in which titanium and copper are sequentially stacked. Or a single film made of an alloy of titanium and copper.

The upper surface of the active pattern between the source electrode SE and the drain electrode DE is exposed and the conductive channel is formed between the source electrode SE and the drain electrode DE depending on whether a voltage is applied to the gate electrode GE conductive channel. The source electrode SE and the drain electrode DE overlap with a part of the semiconductor pattern SM in a region except for the channel portion formed separately from the source electrode SE and the drain electrode DE.

The pixel electrode PE is connected to the drain electrode DE via the protective film PSV. The pixel electrode PE partially overlaps with the storage line SLn, the first branch electrode LSLn, and the second branch electrode RSLn to form a storage capacitor.

The protective film PSV covers the source electrode SE, the drain electrode DE, the channel portion and the gate insulating film GI and has a contact hole CH exposing a part of the drain electrode DE. The passivation layer (PSV) may comprise, for example, silicon nitride or silicon oxide.

The pixel electrode PE is connected to the drain electrode DE through the contact hole CH formed in the protective film PSV. The pixel electrode PE is formed of a transparent conductive material. In particular, the pixel electrode PE is formed of a transparent conductive oxide. The transparent conductive oxide includes ITO (indium tin oxide), IZO (indium zinc oxide), ITZO (indium tin zinc oxide), and the like.

The pixel electrode PE includes a plurality of branches PEb extending radially from the stem PEa and the stem PEa. Some of the stripe portion PEa or the branch portions PEb are connected to the drain electrode DE through the contact hole CH.

The stem portion PEa may be provided in various shapes, and may be provided in a cross shape, for example, as one embodiment of the present invention. The branch portions (PEb) are spaced apart from each other and extend in a direction parallel to each other in the region divided by the stem portion (PEa). The distance between the neighboring branches PEb is spaced by a distance in the order of micrometers, which corresponds to means for aligning the liquid crystal molecules of the liquid crystal layer LCL at a specific azimuth angle.

The pixel PX can be divided into a plurality of domains DM1, DM2, DM3, and DM4 by the stem PEa. The branches PEb correspond to the respective domains DM1, DM2, DM3 and DM4 and may extend in different directions for each of the domains DM1, DM2, DM3 and DM4. In an embodiment of the present invention, the pixel PX includes four domains. However, the present invention is not limited thereto. The pixel PX may include a plurality of domains such as 2, 6, 8, can do.

The first alignment film ALN1 is provided on the pixel electrode PE. The first alignment layer ALN1 pre-tilts the liquid crystal molecules LC of the liquid crystal layer LCL. The first alignment film ALN1 will be described later in more detail.

The second substrate SUB2 includes a second base substrate BS2 and a common electrode CE. The second base substrate BS2 may be a polymer substrate, a plastic substrate, a glass substrate, a quartz substrate, or the like. The second base substrate BS2 may be a transparent insulating substrate. The second base substrate BS2 may be flexible and may be rigid.

The common electrode CE is formed on the second base substrate BS2 and drives the liquid crystal layer LCL by forming an electric field together with the pixel electrode PE. Although the common electrode CE is included in the second substrate SUB2 in the embodiment of the present invention, the common electrode CE is not limited to the second substrate SUB2, ). The common electrode CE may be formed of a transparent conductive material. The common electrode CE may be formed of a conductive metal oxide such as ITO (indium tin oxide), IZO (indium zinc oxide), ITZO (indium tin zinc oxide), or the like. A second alignment film ANL2 covering the common electrode CE is disposed. More specifically, the second alignment film ALN2 will be described later.

A liquid crystal layer (LCL) including liquid crystal molecules (LC) is provided between the first substrate (SUB1) and the second substrate (SUB2). The liquid crystal molecules LC are not particularly limited as long as they are commonly used, but may include, for example, alkenyl-based liquid crystal molecules, alkoxy-based liquid crystal molecules, and the like.

5A is a perspective view schematically showing a first square of the first liquid crystal molecules. And FIG. 5B is a perspective view schematically showing a second square of the second liquid crystal molecules. Hereinafter, the first alignment film ALN1 and the second alignment film ALN2 will be described in more detail.

The first alignment layer ALN1 includes reactive mesogens RM polymerized with each other. Accordingly, the first alignment film ALN1 can pre-tilt the first liquid crystal molecules LC1 adjacent to the first alignment film ALN1 among the liquid crystal molecules LC of the liquid crystal layer LCL. The first liquid crystal molecules LC1 may have a first pretilt angle AN1 with respect to the first alignment layer ALN1.

And the second alignment film ALN2 is provided on the common electrode CE. The second alignment layer ALN2 contains substantially no reactive mesogens RM polymerized with each other and is formed of the second liquid crystal molecules LN2 adjacent to the second alignment layer ALN2 among the liquid crystal molecules LC of the liquid crystal layer LCL RTI ID = 0.0 > LC2. ≪ / RTI >

5A, when the angle formed by the first straight line NL1 included in one surface of the first alignment layer ALN1 and the long axis L11 of the first liquid crystal molecules LC1 is the first angle? (AN1). The first pre-scan angle AN1 may be, for example, an average value, a representative value, or the like of the pre-scan squares of the first liquid crystal molecules LC1. The first pre-scan angle AN1 may be about 80 degrees to about 90 degrees. The first pre-scan angle AN1 may be about 80 degrees to about 89 degrees. May be greater than 80 degrees and smaller than 88 degrees so that the first pre-curvature angle AN1 differs from the second pre-curvature angle AN2 described later.

Referring to FIGS. 4 and 5A, the first alignment layer ALN1 includes a first base layer PAL1 provided on the pixel electrode PE and a first alignment layer PTL1 provided on the first base layer PAL1 . The first base layer (PAL1) is not particularly limited as long as it is generally used, and may be a polymer such as polyimide, polyamic acid, polyamide, polyamic imide, polyester, polyethylene, polyurethane or polystyrene, , And monomers of the polymers.

The first alignment layer PTL1 includes polymerized reactive mesogens RM and is a portion of the first alignment layer ALN1 that substantially pre-tilts the liquid crystal molecules LC. The term " reactive mesogen " refers to photocurable particles, that is, a photocrosslinkable low molecular weight or photopolymerizable polymer. When a specific wavelength of light, for example ultraviolet light, is applied, Cause. The reactive mesogens RM are polymerized and partially crosslinked to pre-tilt the liquid crystal molecules LC to have a predetermined inclination angle with respect to one surface of the first substrate SUB1.

The reactive mesogens (RM) are not particularly limited as long as they are commonly used, and may include, for example, at least one of acrylate, methacrylate, epoxy, oxetane, vinyl-ether and styrene and derivatives thereof .

The reactive mesogens (RM) may have polarity. For example, reactive mesogens (RM) may comprise functional groups with charge. The reactive mesogens (RM) as a whole are bipolar by the functional group having a large positive charge, and the reactive mesogens (RM) as a whole can have a negative polarity by a functional group having a large negative charge. The first alignment layer PTL1 and the second alignment layer PTL2 in which the polymerization degree of the reactive mesogens RM are greatly different in the process of forming the alignment layers PTL1 and PTL2 by the reactive mesogens RM having a specific polarity, Forming layer PTL2 can be formed. The first alignment layer (PTL1) may contain a larger amount of polymerized reactive mesogens (RM) than the second alignment layer (PTL2). Thus, the first alignment layer PTL1 pre-tilts the first liquid crystal molecules LC1 adjacent to the first base layer PAL1 to have a predetermined inclination angle with respect to one surface of the first substrate SUB1.

The functional group having a positive charge can be, for example, a hydrogen ion, an ammonium ion, or the like. The functional group having a positive charge may include an alkali metal ion, and may be, for example, a lithium ion, a sodium ion, a potassium ion, or the like. The functional group having a negative charge can be, for example, a carboxyl group or the like. The functional group having a negative charge may include a halide ion, for example, a fluoride ion, a chloride ion, a bromide ion, an iodide ion, or the like.

Referring to FIGS. 4 and 5B, the second alignment layer ALN2 includes a second base layer PAL2 provided on the common electrode CE and a second alignment layer PTL2 provided on the second base layer PAL2. . The second base layer PAL2 is not particularly limited as long as it is commonly used, but may be a polymer such as a polyimide, a polyamic acid, a polyamide, a polyamic imide, a polyester, a polyethylene, a polyurethane or a polystyrene, , And monomers of the polymers.

The second alignment layer (PTL2) contains a very small amount of the polymerized reactive mesogens (RM) which are polymerized with each other in a very small amount compared to the first alignment layer (PTL1), and also the absolute amount of the polymerized reactive mesogens (RM). In other words, substantially the second alignment layer (PTL2) does not contain polymerized reactive mesogens (RM). Here, "the second alignment layer (PTL2) is substantially free of reactive mesogens polymerized with each other" means that reactive mesogens polymerized with each other in the second alignment layer (PTL2) due to a process error Means some degree of association.

The second alignment layer (PTL2) aligns the second liquid crystal molecules (LC2) so as not to have a predetermined inclination angle with respect to one surface of the second substrate (SUB2). Therefore, the second liquid crystal molecules LC2 adjacent to the second base layer PAL2 do not have a specific directionality, and can be randomly arranged on the second alignment film ALN2. The second liquid crystal molecules LC2 may be arranged to be perpendicular to the second alignment film ALN2 on the second alignment film ALN2 in a state in which no electric field is applied to the liquid crystal layer LCL.

And the second liquid crystal molecules LC2 may have a second pretilt angle AN2 with respect to the second alignment film ALN2. 5B, the angle formed by the second straight line NL2 included in one surface of the second alignment layer ALN2 and the long axis L12 of the second liquid crystal molecules LC2 is defined as the second linearly polarized angle AN2 Can be defined. The second pre-casting angle AN2 is different from the first pre-casting angle AN1 and is very small compared to the first pre-casting square AN1. For example, the second pretilt angle AN2 may be an average value, a representative value, or the like of the pretilt angles of the second liquid crystal molecules LC2. The second pre-warping angle AN2 may be about 88 degrees to about 90 degrees. The second prearranged angle AN2 may be greater than about 89 degrees and less than about 90 degrees. The two-line-ruled square AN2 is set to be larger than the one-line squareangle AN1 in a range of about 88 degrees to about 90 degrees. When the 1-line-diameter squared AN1 is set to 80 degrees, 85 degrees, 86 degrees, and 89 degrees, respectively, according to one embodiment of the present invention, the 2-line-diameter squared AN2 is larger than the 1-squared angle AN1 89.5 degrees or 90 degrees.

6A is a perspective view schematically showing a curved display device according to an embodiment of the present invention. 6B is a perspective view schematically illustrating a pixel, a first alignment layer and a second alignment layer corresponding to a pixel according to an embodiment of the present invention. 6C is a plan view schematically showing the first alignment layer when viewed in the DR5 direction of FIG. 6B. FIG. 6D is a plan view schematically showing the second alignment layer when viewed in the DR5 direction of FIG. 6B. FIG. 6E is a plan view schematically showing the overlap region, the lower polarizer and the upper polarizer of the first and second alignment films when viewed in the DR3 direction of FIG. 6B. FIG. 6F is a schematic view of a user recognizing an image displayed on a curved display device according to an exemplary embodiment of the present invention. 6E, the lower polarizer POL1 of the first substrate SUB1 and the upper polarizer POL2 provided on the upper portion of the second substrate SUB2 are further illustrated. Referring to FIGS. 6A to 6D, the first alignment film ALN1 includes the lower alignment areas L_AA1, L_AA2, L_AA3, L_AA4. The lower alignment areas L_AA1, L_AA2, L_AA3 and L_AA4 are formed by aligning a first lower alignment area L_AA1, a second lower alignment area L_AA2, a third lower alignment area L_AA3 and a fourth lower alignment area L_AA4 . The lower alignment areas L_AA1, L_AA2, L_AA3 and L_AA4 may overlap with and overlap the domains DM1, DM2, DM3 and DM4 in the direction DR5 opposite to the normal direction DR4 of the pixel PX.

A first lower alignment area L_AA1, a second lower alignment area L_AA2, and a third lower alignment area L_AA1 corresponding to the first domain DM1, the second domain DM2, the third domain DM3, and the fourth domain DM4, The first liquid crystal molecules (LC1 in Fig. 4) on each of the lower alignment region L_AA3 and the fourth lower alignment region L_AA4 are pre-tilted by reactive mesogens (RM in Fig. 4) polymerized with each other. As the electric field is formed in the liquid crystal layer LCL, the pre-tilted liquid crystal molecules are aligned in parallel more rapidly than the liquid crystal molecules not pre-tilted. That is, they are rapidly rearranged from the vertically aligned state to the parallel orientation.

When an electric field is applied to the liquid crystal layer LCL, the pre-tilted first liquid crystal molecules (LC1 in Fig. 4) are oriented in parallel in the extending direction of the branches (PEb in Fig. 3) on the first lower alignment region L_AA1 . The extension direction of the branches (PEb, see Fig. 3) may be substantially parallel to the first sub-direction D1. The first sub-direction D1 may mean the average direction of the parallel-oriented directions when the first liquid crystal molecules (LC1 in Fig. 4) are aligned in parallel on the first lower alignment area L_AA1.

Similarly, when an electric field is applied to the liquid crystal layer LCL, the pre-tilted first liquid crystal molecules (LC1 in Fig. 4) are oriented in parallel in the second sub-direction D2 on the second lower alignment area L_AA2 Direction parallel to the third sub-direction D3 on the third lower alignment area L_AA3 and parallel to the fourth sub-direction D4 on the fourth lower alignment area L_AA4. The second subdirection D2 may mean the average direction of the directions of parallel orientation when the first liquid crystal molecules (LC1 of FIG. 4) are oriented in parallel on the second lower alignment area L_AA2, The subdirection D3 may mean the average direction of the directions of parallel orientation when the first liquid crystal molecules LC1 of FIG. 4 are oriented in parallel on the third lower alignment area L_AA3, (D4) may mean the average direction of parallel-oriented directions when the first liquid crystal molecules (LC1 in Fig. 4) are aligned in parallel on the fourth lower alignment area L_AA4.

The second alignment film ALN2 includes upper alignment areas U_AA1, U_AA2, U_AA3, and U_AA4. The upper alignment areas U_AA1, U_AA2, U_AA3 and U_AA4 are aligned in a first upper alignment area U_AA1, a second upper alignment area U_AA2, a third upper alignment area U_AA3 and a fourth upper alignment area U_AA4 . The upper alignment areas U_AA1, U_AA2, U_AA3 and U_AA4 can overlap with and overlap the domains DM1, DM2, DM3 and DM4 in the direction DR5 opposite to the normal direction DR4 of the pixel PX.

The second alignment film ALN2 does not include the reactive mesogens substantially polymerized with each other (RM in Fig. 4). Thus, the second liquid crystal molecules (refer to FIG. 4A) are formed on the first upper alignment region U_AA1, the second upper alignment region U_AA2, the third upper alignment region U_AA3, and the fourth upper alignment region U_AA4, LC2 are not substantially pre-tilted and are randomly provided without specific directionality.

When an electric field is applied to the liquid crystal layer (LCL), the second liquid crystal molecules (LC2 in Fig. 4) are randomly oriented in parallel. However, the two liquid crystal molecules (LC2 in Fig. 4) are parallel to the first sub-direction D1 due to the influence of the pre-tilted first liquid crystal molecules (LC1 in Fig. 4) Directionality. The degree of alignment of the first liquid crystal molecules LC1 of the first lower alignment area L_AA1 in the first sub direction D1 is defined as a first scalar value and the degree of alignment of the first liquid crystal molecules LC1 of the first liquid crystal molecules LC1 of the first lower alignment area L_AA1, When defining the degree to which the molecules LC2 are arranged in the first sub-direction D1 as a second scalar value, the second scalar value may be very small compared to the first scalar value. 4 is substantially not pre-tilted so that the rate at which the second liquid crystal molecules (LC2 in Fig. 4) are aligned on the first upper alignment area U_AA1 is equal to the speed at which the first liquid crystal molecules It is significantly slower than the rate at which the liquid crystal molecules (LC1 in Fig. 4) are aligned in parallel. The number of the second liquid crystal molecules (LC2 in Fig. 4) oriented in parallel in the first sub-direction D1 is larger than the number of the first liquid crystal molecules (LC1 in Fig. 4) aligned in the first sub- Significantly less than number.

Similarly, when an electric field is applied to the liquid crystal layer LCL, the second liquid crystal molecules (LC2 in Fig. 4) are aligned in the second sub-direction D2 on the second upper alignment area U_AA2, Direction D3 on the fourth upper alignment area U_AA3 and in the fourth sub direction D4 on the fourth upper alignment area U_AA4.

6A to 6E, the first alignment layer ALN1 and the second alignment layer ALN2 overlap the overlap areas OVA1, OVA2 OVA3, OVA4, OVA5, and OVA6 when viewed in the third direction DR3, Respectively. The overlapping areas OVA1, OVA2 OVA3, OVA4, OVA5 and OVA6 are arranged in the first overlapping area OVA1, the second overlapping area OVA2, the third overlapping area OVA3, the fourth overlapping area OVA4, Region OVA5 and sixth overlap region OVA6.

When the electric field is applied to the liquid crystal layer LCL, the direction of the optical axis of the liquid crystal layer LCL in the overlap areas OVA1, OVA2 OVA3, OVA4, OVA5 and OVA6 is the direction of the lower alignment areas L_AA1, L_AA2, L_AA3, L_AA4, (LC2 in Fig. 4) on the parallel alignment direction of the first liquid crystal molecules (LC1 in Fig. 4) and the upper alignment regions U_AA1, U_AA2, U_AA3, U_AA4 on the liquid crystal molecules .

The second overlapping area OVA2 is an overlapping area of the second lower alignment area L_AA2 and the first upper alignment area U_AA1. 4) is not pre-tilted, and the first liquid crystal molecules (LC1 in Fig. 4) are pre-tilted, and the second liquid crystal molecules (LC1 in Fig. (LC2 in FIG. 4) is significantly slower than the rate at which the first liquid crystal molecules (LC1 in FIG. 4) are aligned in parallel. The number of the second liquid crystal molecules (LC2 in Fig. 4) oriented in parallel in the second sub direction D2 is equal to the number of the first liquid crystal molecules (LC1 in Fig. 4) aligned in the first sub direction D1 Lt; / RTI >

Thus, when an electric field is applied to the liquid crystal layer LCL, the direction of the optical axis of the liquid crystal layer LCL in the second overlapping area OVA2 can be substantially parallel to the first sub-direction D1. Similarly, when an electric field is applied to the liquid crystal layer LCL, the direction of the optical axis of the liquid crystal layer LCL in the fifth overlap region OVA5 is substantially parallel to the fourth subdirection D2.

The parallel alignment direction of the first liquid crystal molecules (LC1 in Fig. 4) in the first overlap region OVA1 is substantially the same as the parallel alignment direction of the second liquid crystal molecules (LC2 in Fig. 4). Thus, the direction of the optical axis of the liquid crystal layer LCL in the first overlapping area OVA1 is substantially parallel to the first sub-direction D1. Similarly, the direction of the optical axis of the liquid crystal layer LCL in the third overlapping area OVA3 is substantially parallel to the second sub-direction D2, and the direction of the optical axis of the liquid crystal layer LCL in the fourth overlapping area OVA4 The direction of the optical axis of the liquid crystal layer LCL in the sixth overlapping area OVA6 is substantially parallel to the fourth sub direction D4.

The lower polarizer POL1 has a first transmission axis PA1 and the upper polarizer POL2 has a second transmission axis PA2. The first transmission axis PA1 and the second transmission axis PA2 are orthogonal to each other. For example, when the first transmission axis PA1 is parallel to the second direction DR2, the second transmission axis PA2 is parallel to the second direction DR2. 6E, the lower polarizer POL1 and the upper polarizer POL2 are shown to be smaller than the first alignment film ALN1 and the second alignment film ALN2 for convenience of explanation. Referring to FIGS. 6A to 6F, The first overlap area OVA1, the second overlap area OVA2, the third overlap area OVA3, the fourth overlap area OVA4, the fifth overlap area OVA5 The direction of the optical axis of the liquid crystal layer LCL is the direction of the first transmission axis PA1 of the lower polarizer POL1 or the direction of the first transmission axis PA1 of the upper polarizer POL2 in the sixth overlap region OVA6 PA2). ≪ / RTI > Accordingly, the user USER is configured to select the first overlap area OVA1, the second overlap area OVA2, the third overlap area OVA3, the fourth overlap area OVA4, the fifth overlap area OVA5, The light passing through the region OVA 6 can be seen.

7A is a perspective view schematically showing a curved display device according to a comparative example. 7B is a perspective view schematically showing a pixel included in a curved display device according to a comparative example, a first alignment film corresponding to a pixel, and a second alignment film. FIG. 7C is a plan view schematically showing the first alignment layer when viewed in the DR5 direction in FIG. 7B. FIG. 7D is a plan view schematically showing the second alignment layer when viewed in the DR5 direction of FIG. 7B. FIG. 7E is a plan view schematically showing the overlap region of the first alignment film and the second alignment film in the DR3 direction in FIG. 7B. FIG.

7A to 7E, a curved display device 1000 according to a comparative example includes a first alignment layer aln1 including reactive mesogens that are polymerized with each other, and a second alignment layer including a reactive mesogen lt; / RTI > The first alignment film (aln1) and the second alignment film (aln2) may contain substantially the same polymerized reactive mesogens. Thus, the first liquid crystal molecules on the first alignment film aln1 are pre-tilted and the second liquid crystal molecules on the second alignment film aln2 are also pre-tilted. The square of the first liquid crystal molecules and the square of the second liquid crystal molecules may be equal to each other.

The first liquid crystal molecules on the lower alignment regions l_aa1, l_aa2, l_aa3 and l_aa4 included in the first alignment film aln1 and the first liquid crystal molecules on the second alignment film aln2 included in the second alignment film aln2, The second liquid crystal molecules on the alignment regions u_aa1, u_aa2, u_aa3, u_aa4 are aligned in the same direction in parallel with each other. Both the first liquid crystal molecules and the second liquid crystal molecules are pre-tilted, and the parallel alignment rates are similar to each other.

More specifically, when driving voltage is applied to apply an electric field, the first liquid crystal molecules on the first lower alignment area I_aa1 and the second liquid crystal molecules on the first upper alignment area u_aa1 are aligned in the first sub- And the first liquid crystal molecules on the second lower alignment area l_aa2 and the second liquid crystal molecules on the second upper alignment area u_aa2 are aligned in parallel in the second sub direction D2. The first liquid crystal molecules on the third lower alignment area I_aa3 and the second liquid crystal molecules on the third upper alignment area u_aa3 are aligned in the third sub direction D3 and the second liquid crystal molecules on the fourth lower alignment area I_aa4 The first liquid crystal molecules and the second liquid crystal molecules on the fourth upper alignment area u_aa4 are aligned in the fourth subdirection D4 in parallel.

7D, when viewed in the third direction DR3, the first alignment film aln1 and the second alignment film aln2 have overlapping areas ova1, ova2, ova3, ova4, ova5, ova6 overlapping each other . The overlap areas ova1, ova2, ova3, ova4, ova5 and ova6 are formed in the first overlap area ova1, the second overlap area ova2, the third overlap area ova3, the fourth overlap area ova4, An overlap area ova5 and a sixth overlap area ova6.

In the case of the curved display device 1000 according to the comparative example, the first liquid crystal molecules and the second liquid crystal molecules are all pre-tilted in the second overlap region ova2. The direction of the optical axis of the liquid crystal layer lcl in the second overlapping area ova2 is parallel to the eighth sub direction D8 which is the sum of the first sub direction D1 and the second sub direction D2. Similarly, the direction of the optical axis of the liquid crystal layer lcl in the fifth overlap region ova5 is parallel to the tenth sub-direction D10 which is the sum of the third sub-direction D3 and the fourth sub-direction D4 do.

The curved display apparatus 1000 according to the comparative example also includes the lower polarizer pol1 and the upper polarizer pol2 and is provided with the first transmission axis pa1 of the lower polarizer pol1 and the second transmission axis pa2 of the upper polarizer pol2, The transmission axes pa2 are orthogonal to each other. For example, when the first transmission axis pa1 of the lower polarizer pol1 is parallel to the second direction DR2, the second transmission axis pa2 of the upper polarizer pol2 is parallel to the first direction DR1 do. The first direction DR1 may be parallel to the eighth sub direction D8 or the tenth sub direction D10.

Therefore, in the curved display device 1000 according to the comparative example, when a driving voltage is applied and an electric field is applied, the driving voltage is applied to the liquid crystal layer lcl in each of the second overlap region ova2 and the sixth overlap region ova6. The direction of the optical axis is parallel to the direction of the first transmission axis pa1 of the lower polarizer pol1 or the direction of the second transmission axis pa2 of the upper polarizer pol2.

When the direction of the first transmission axis pa1 of the lower polarizer pol1 is parallel to the direction of the optical axis of the liquid crystal layer lcl in each of the second overlap region ova2 and the sixth overlap region ova6, The light transmitted through the polarizing plate pol1 passes through the second overlapping area ova2 and the sixth overlapping area ova6 and is blocked by the second transmission axis pa2 of the upper polarizing plate pol2.

When the direction of the second transmission axis pa2 of the upper polarizer pol2 is parallel to the direction of the optical axis of the liquid crystal layer lcl in each of the second overlap region ova2 and the sixth overlap region ova6 , The light transmitted through the lower polarizer pol1 is blocked without passing through the second overlap region ova2 and the sixth overlap region ova6. Thus, the user can not visually recognize the light of the second overlapping area ova2 and the sixth overlapping area ova6.

That is, in the curved display device according to the comparative example, the first liquid crystal molecules on the lower alignment regions of the first alignment film and the second liquid crystal molecules on the upper alignment regions of the second alignment film corresponding to the lower alignment regions are in the same direction So that the user can not visually recognize the light when the first substrate and the second substrate are warped, resulting in a defective texture in the pixel.

On the contrary, the first liquid crystal molecules of the curved display device according to an embodiment of the present invention described with reference to FIGS. 6A to 6F are pre-tilted by a first square, but the second liquid crystal molecules are not substantially pre- 1 < / RTI > square. Accordingly, even if the curved display device according to the embodiment of the present invention is warped, the defective texture does not occur. Accordingly, the curved display device according to the embodiment of the present invention can improve the display quality.

Hereinafter, a method of manufacturing a curved display device according to an embodiment of the present invention will be described. Hereinafter, differences from the curved display device according to the embodiment of the present invention will be described in detail, and a description of the curved display device according to an embodiment of the present invention is omitted.

8 is a flowchart schematically showing a method of manufacturing a curved display device according to an embodiment of the present invention.

1A to 8, a method of manufacturing a curved display device 10 according to an embodiment of the present invention includes the steps of providing a first substrate SUB1, The liquid crystal molecules LC and the reactive mesogens RM having a predetermined polarity are provided between the first substrate SUB1 and the second substrate SUB2, And a step S40 of forming a first alignment layer PTL1 on the first substrate SUB1 by providing light and an electric field to the liquid crystal composition.

The step of providing a first substrate (S10) may include providing a first base substrate (BS1) with a pixel and a first base layer (PAL1). The first substrate SUB1 may be formed through a plurality of photolithography processes and a plurality of insulation layer forming processes, and the first base layer PAL1 may be formed through a coating / deposition / printing process.

9, 10 and 11 are sectional views sequentially illustrating a method of manufacturing a curved display device according to an embodiment of the present invention. 12 is a cross-sectional view illustrating a method of manufacturing a curved display device according to an embodiment of the present invention, corresponding to FIG.

Referring to Figs. 1A to 12, a color filter CF and a black matrix BM for displaying color are provided on a first base substrate BS1. In the method of manufacturing a curved display device according to an embodiment of the present invention, the color filter CF and the black matrix BM are provided on the first base substrate BS1. However, Alternatively, the color filter CF and the black matrix BM may be provided on the second base substrate BS2.

The color filter CF can be formed by providing a color layer showing red, green, blue, or other color on the first base substrate BS1 and patterning the color layer using photolithography. The method of forming the color filter CF is not limited to this, and may be formed by an ink-jet method or the like.

The black matrix BM may be provided on the first base substrate BS1 and may be provided before, after, or simultaneously with the provision of the color filter CF. The black matrix BM may be provided by forming a light-shielding layer that absorbs light on the first base substrate BS1 and patterning the light-shielding layer by using photolithography, and may alternatively be formed by another method, for example, Method or the like.

A gate pattern is formed on the color filter CF and the black matrix BM. The gate pattern includes the gate lines GL and the storage electrode portion. The gate pattern may be formed using a photolithography process.

A gate insulating film GI is formed on the gate pattern. A semiconductor pattern SM is formed on the gate insulating film GI. The semiconductor pattern SM may include an active pattern and an ohmic contact layer formed on the active pattern. The semiconductor pattern SM may be formed using a photolithography process.

A data pattern is formed on the semiconductor pattern SM. The data pattern includes a data line DL, a source electrode SE and a drain electrode DE. The data pattern may be formed using a photolithographic process. At this time, the semiconductor pattern SM and the data pattern may be formed using one half mask, a diffraction mask, or the like.

A protective film (PSV) is formed on the data pattern. The protective film PSV has a contact hole CH exposing a part of the drain electrode DE and can be formed using a photolithography process.

A pixel electrode PE connected to the drain electrode DE through the contact hole CH is formed on the passivation layer PSV. The pixel electrode PE can be formed using a photolithography process.

The first base layer PAL1 is formed on the first base substrate BS1 on which the pixel electrodes PE are formed. The first alignment liquid may include a polymer such as polyimide, polyamic acid, polyamide, polyamic imide, polyester, polyethylene, polyurethane, or polystyrene, a mixture of polymers, or a monomer of a polymer. The first base layer PAL1 can be formed by applying the first alignment liquid on the first base substrate BS1 and then heating the first alignment liquid or applying ultraviolet rays thereto. The first alignment liquid may contain a photoinitiator.

The step S20 of providing the second substrate SUB2 may include providing a second base substrate BS2 having the common electrode CE and the second base layer PAL2.

On the second base substrate BS2, a common electrode CE is provided. The common electrode CE can be formed in various ways and can be formed using a photolithography process.

The second base layer PAL2 is formed on the second base substrate BS2 on which the common electrodes CE and the like are formed. The second base layer PAL2 is formed by applying a second alignment liquid onto the second substrate SUB2, and then heating the second alignment liquid, although not shown. The second alignment liquid may include a polymer such as polyimide, polyamic acid, polyamide, polyamic imide, polyester, polyethylene, polyurethane, or polystyrene, a mixture of polymers, or a monomer of a polymer. The second base layer PAL2 can be formed by applying the second alignment liquid on the second base substrate BS2, then heating the second alignment liquid, or applying ultraviolet rays. The second alignment liquid may not contain a photoinitiator.

A liquid crystal composition is provided between the first substrate SUB1 and the second substrate SUB2 (S30). The liquid crystal composition includes liquid crystal molecules (LC) and reactive mesogens (RM) having polarity (liquid crystal molecules are represented by LC in the drawings regardless of the kind). The liquid crystal molecules LC and the reactive mesogens RM are not described in detail hereinbefore.

The first alignment layer (PTL1) can be formed by applying an electric field to the liquid crystal composition and curing the reactive mesogens (RM) of the liquid crystal composition (S40). An electric field may be formed on the liquid crystal composition by using the power source unit 100 including the first electrode unit 110 connected to the first substrate SUB1 and the second electrode unit 120 connected to the second substrate. The connection position of the first substrate SUB1 and the first electrode unit 110 is not particularly limited and if the first substrate SUB1 can apply a voltage to the first substrate SUB1, SUB1). ≪ / RTI > The connection position between the second substrate SUB2 and the second electrode unit 120 is not particularly limited and if the voltage can be applied to the second substrate SUB2, SUB2). ≪ / RTI > For example, the first electrode unit 110 may be connected to the pixel electrode PE, and the second electrode unit 120 may be connected to the common electrode CE.

When an electric field is applied to the liquid crystal composition, the reactive mesogens RM having a predetermined polarity move in a certain direction. The case where the reactive mesogens RM have a bipolar property will be described. When a first voltage is applied to the first electrode unit 110 and a second voltage higher than the first voltage is applied to the second electrode unit 120, the positive-polarity reactive mesogens RM are formed on the first alignment- PTL1). Negative voltage may be applied to the first electrode unit 110 and the second electrode unit 120 may be grounded. The first electrode unit 110 may be grounded and a positive voltage may be applied to the second electrode unit 120.

The case where the reactive mesogens RM have a negative polarity will be described. When a first voltage is applied to the first electrode unit 110 and a second voltage lower than the first voltage is applied to the second electrode unit 120, the negative reactive mesogens RM are applied to the first alignment layer PTL1). A positive voltage may be applied to the first electrode unit 110, and the second electrode unit 120 may be grounded. The first electrode unit 110 may be grounded and a negative voltage may be applied to the second electrode unit 120.

In the method of manufacturing the curved display device 10 according to an embodiment of the present invention, an electric field is formed between the first electrode portion and the second electrode portion, and the reactive mesogens RM having the functional groups are disposed on the first substrate The first base layer PTL1 includes a photoinitiator and the second base layer PTL2 does not include a photoinitiator so that the reactive mesogens RM can be removed Or may be moved to the first substrate SUB1.

The liquid crystal composition is provided with light such as ultraviolet light to cure the reactive mesogens (RM) contained in the liquid crystal composition. Providing light, the reactive mesogens RM are polymerized and bonded to the first base layer PAL1. Thus, the first alignment layer (PTL1) is provided on the first base layer (PAL1). The mutually polymerized reactive mesogens (RM) can constitute a plurality of patterns in an island shape. In other words, the first alignment layer (PTL1) may be configured such that the polymerized reactive mesogens (RM) are spaced at regular intervals or at random from each other. The polymerized reactive mesogens (RM) may be provided, for example, in the form of a side chain. The first alignment layer (PTL1) can pre-tilt the first liquid crystal molecules (LC1).

In the method of manufacturing the curved display device 10 according to an embodiment of the present invention, the reactive mesogens RM are included in the liquid crystal composition. However, the present invention is not limited to the reactive mesogens RM) may also be included in the first alignment liquid.

The first liquid crystal molecules LC1 adjacent to the first alignment layer PTL1 have a first pretilt angle AN1. The first liquid crystal molecules LC1 pre-tilted so as to have the first pre-scan square AN1 have the first pre-scan square AN1 even if the voltage is no longer applied. The first pre-scan angle AN1 may be, for example, an average value, a representative value, or the like of the pre-scan squares of the first liquid crystal molecules LC1.

When an electric field is applied to the liquid crystal composition, the reactive mesogens RM hardly move toward the second base layer PTL2. Only a small amount can be moved, and thus the second alignment layer PTL2 can be formed on the second base layer PAL2. The second alignment layer (PTL2) comprises reactive mesogens (RM) polymerized with each other. The polymerized reactive mesogens (RM) may be provided in, for example, a side chain form or a network form. However, the amount of the second alignment layer (PTL2) is small compared to the first alignment layer (PTL1), making it difficult to pre-tilt the second liquid crystal molecules (LC2). Accordingly, the second liquid crystal molecules LC2 may have a second pre-scan square AN2 and the second pre-scan square AN2 may be different from the first pre-scan square AN1. For example, the second pretilt angle AN2 may be an average value, a representative value, or the like of the pretilt angles of the second liquid crystal molecules LC2.

11 and 12, a method of manufacturing a curved display device 10 according to an embodiment of the present invention may further include bending the first substrate SUB1 and the second substrate SUB2 . The first substrate SUB1 may have a first radius of curvature R1. And the second substrate SUB2 may have a second radius of curvature R2.

Referring to FIGS. 2 and 11, the first radius of curvature R1 may be greater than the second radius of curvature R2. 11, an image may be displayed in the direction from the first substrate SUB1 to the second substrate SUB2. 2 and 12, the first radius of curvature R1 may be smaller than the second radius of curvature R2. 12 is the same as that of the display device shown in Fig. In FIG. 12, an image may be displayed in the direction from the second substrate SUB2 to the first substrate SUB1.

The curved display device manufactured by the manufacturing method of the curved display device according to the comparative example has the first liquid crystal molecules on the lower alignment areas of the first alignment film and the upper alignment areas of the second alignment film corresponding to the lower alignment areas The second liquid crystal molecules are oriented in the same direction with respect to each other. Thus, as described above, the curved display device according to the comparative example can not visually recognize light when it is warped, resulting in a defective texture in the pixel.

However, the first liquid crystal molecules of the curved display device manufactured by the method of manufacturing a curved display device according to an embodiment of the present invention are pre-tilted by the first linearly polarized square, but the second liquid crystal molecules are substantially not pre-tilted And has a second pre-scan square different from the first pre-scan square. Accordingly, the curved display device manufactured by the manufacturing method of the curved display device according to the embodiment of the present invention does not cause defective texture even when bent. Accordingly, the curved display device manufactured by the manufacturing method of the curved display device according to the embodiment of the present invention can improve the display quality.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative and non-restrictive in every respect.

10: Curved display device 100: Power source
110: first electrode part 120: second electrode part
ALN1: first alignment film ALN2: second alignment film
BM: black matrix CE: common electrode
CF: color filter LCL: liquid crystal layer
LC: liquid crystal molecules RM: reactive mesogens
PAL1: first base layer PTL1: first orientation layer
PE: pixel electrode

Claims (31)

A first substrate;
A second substrate facing the first substrate;
A liquid crystal layer formed between the first substrate and the second substrate and including liquid crystal molecules;
A first alignment layer formed between the first substrate and the liquid crystal layer, the first alignment layer including reactive mesogens polymerized with each other; And
And a second alignment layer formed between the liquid crystal layer and the second substrate,
Wherein the reactive mesogen has a functional group having a charge. The method according to claim 1,
Wherein the curved surface display device is flexible. The method according to claim 1,
Wherein the functional group has a positive charge. The method of claim 3,
Wherein the functional group comprises an alkali metal ion. The method according to claim 1,
Wherein the functional group has a negative charge. 6. The method of claim 5,
Wherein the functional group comprises halogen ions. The method according to claim 1,
The first substrate
A first base substrate;
A color filter formed on the first base substrate; And
And a black matrix formed on the first base substrate. Providing a first substrate;
Providing a second substrate opposite the first substrate;
Providing a liquid crystal composition between the first substrate and the second substrate, the liquid crystal composition comprising reactive mesogens having functional groups with liquid crystal molecules and charge; And
And providing a light and an electric field to the liquid crystal composition to form a first alignment layer on the first substrate. 9. The method of claim 8,
The method of claim 1, further comprising providing a power source unit including a first electrode unit connected to the first substrate and a second electrode unit connected to the second substrate. 10. The method of claim 9,
Wherein the functional group has a positive charge. 11. The method of claim 10,
The step of forming the first alignment-
Applying a first voltage to the first electrode unit,
And applying a second voltage higher than the first voltage to the second electrode portion to apply an electric field to the liquid crystal composition. 11. The method of claim 10,
The step of forming the first alignment-
A negative voltage is applied to the first electrode unit,
And grounding the second electrode portion to apply an electric field to the liquid crystal composition. 11. The method of claim 10,
The step of forming the first alignment-
The first electrode portion is grounded,
And applying a positive voltage to the second electrode portion to apply an electric field to the liquid crystal composition. 11. The method of claim 10,
Wherein the functional group comprises an alkali metal ion. 10. The method of claim 9,
Wherein the functional group has a negative charge. 16. The method of claim 15,
The step of forming the first alignment-
Applying a third voltage to the first electrode unit,
And applying a fourth voltage lower than the third voltage to the second electrode unit to apply an electric field to the liquid crystal composition. 16. The method of claim 15,
The step of forming the first alignment-
A positive voltage is applied to the first electrode unit,
And grounding the second electrode portion to apply an electric field to the liquid crystal composition. 16. The method of claim 15,
The step of forming the first alignment-
The first electrode portion is grounded,
And applying a negative voltage to the second electrode portion to apply an electric field to the liquid crystal composition. 16. The method of claim 15,
Wherein the functional group comprises halide ions. 9. The method of claim 8,
And bending the first substrate and the second substrate. A first substrate bent;
A second substrate facing the first substrate and curved;
A liquid crystal layer provided between the first substrate and the second substrate, the liquid crystal layer including liquid crystal molecules;
A first alignment layer comprising reactive mesogens polymerized with each other and provided between the first substrate and the liquid crystal layer; And
And a second alignment layer provided between the second substrate and the liquid crystal layer,
Wherein the first liquid crystal molecules adjacent to the first alignment layer among the liquid crystal molecules have a first pretilt angle,
And the second liquid crystal molecules adjacent to the second alignment film among the liquid crystal molecules have a second pre-alignment angle different from the first pre-alignment angle. 22. The method of claim 21,
The first pre-
80 DEG to 90 DEG. 22. The method of claim 21,
The second pre-
Wherein the angle is in the range of 88 DEG to 90 DEG. 22. The method of claim 21,
The first alignment layer
A first base layer provided on the first substrate; And
And a first orientation-imparting layer provided on the first base layer and including the polymerized reactive mesogens. 22. The method of claim 21,
The first substrate has a first radius of curvature,
Wherein the second substrate has a second radius of curvature that is different from the first radius of curvature. 22. The method of claim 21,
The first substrate
A first base substrate; And
And a pixel electrode provided on the first base substrate,
The second substrate
A second base substrate; And
And a common electrode provided on the second base substrate and facing the pixel electrode. 27. The method of claim 26,
The pixel electrode
Line base; And
And a plurality of branches extending from the stem base. 28. The method of claim 27,
Wherein the pixel electrode is defined as a plurality of domains having different extending directions of the plurality of branch portions with respect to the stem portion. 29. The method of claim 28,
And the branches of each of the domains extend parallel to each other. 30. The method of claim 29,
The domains
The first domain, the second domain, the third domain, and the fourth domain. 22. The method of claim 21,
A first polarizer provided below the first substrate and having a first transmission axis; And
And a second polarizer provided on the second substrate and having a second transmission axis,
And the direction of the first transmission axis and the direction of the second transmission axis are orthogonal to each other.

Images