KR20120067868A - Liquid crystal display device and method of fabricating the same - Google Patents

Abstract

PURPOSE: A polarizing plate, a liquid crystal display device with the same, and a manufacturing method thereof are provided to omit a polarizing plate on an external surface of a color filter substrate. CONSTITUTION: A pixel electrode(169) is formed on the inner surface of a first substrate. The pixel electrode is connected to a thin film transistor. A common electrode(135) corresponds to the pixel electrode. The common electrode generates an electric field. An in-cell polarizing layer(112) is formed on the inner surface of a second substrate. A liquid crystal layer(180) is formed between the first and second substrates.

Description

Polarizing layer and liquid crystal display including same and manufacturing method thereof {LIQUID CRYSTAL DISPLAY DEVICE AND METHOD OF FABRICATING THE SAME}

The present invention relates to a liquid crystal display, and more particularly, to a polarizing layer, a liquid crystal display including the same in a cell, and a manufacturing method thereof.

In general, a liquid crystal display device uses optical anisotropy and polarization properties of liquid crystal molecules of the liquid crystal layer.

Since the liquid crystal molecules are thin and long in structure, the liquid crystal molecules have an orientation in the arrangement of the liquid crystal molecules, and the alignment direction of the liquid crystal molecules can be controlled by artificially applying an electric field to the liquid crystal molecules. When the arrangement direction of the liquid crystal molecules is changed, light is refracted in the arrangement direction of the liquid crystal molecules due to the optical anisotropy of the liquid crystal molecules, thereby displaying an image.

That is, in the liquid crystal display device, the light transmittance is determined by the phase delay generated by the optical properties of the liquid crystal molecules when passing through the liquid crystal layer, and the phase delay is determined by the refractive index anisotropy of the liquid crystal molecules and the array substrate and the color filter substrate. It is determined by the cell gap which is the separation distance between the cells.

Accordingly, the liquid crystal display device includes two substrates having an electric field generating electrode formed therein and a liquid crystal layer formed between the two substrates. Display.

A liquid crystal display device will be described in more detail with reference to FIG. 1.

1 is a cross-sectional view of a general liquid crystal display device. As shown in FIG. 1, the general liquid crystal display device 1 includes an array substrate and a color filter substrate bonded to each other with the liquid crystal layer 30 interposed therebetween.

The lower array substrate has a plurality of gate wirings (not shown) and data wirings (not shown) that are arranged horizontally and horizontally on the inner surface of the transparent first substrate 10 to define the plurality of pixel regions P. Thin film transistors Tr are provided at the intersections of these two wires (not shown) and are connected in one-to-one correspondence with pixel electrodes 18 provided in the pixel regions P. As shown in FIG.

In addition, the color filter substrate may be formed on an inner surface of the transparent second substrate 20 to cover components such as the gate line (not shown), the data line (not shown), and the thin film transistor Tr. A lattice-shaped black matrix 25 surrounding the region P and having an open portion corresponding to each pixel region P, and in these open portions sequentially and repeatedly arranged to correspond to each pixel region P, respectively. A color filter layer 26 including red, green, and blue color filter patterns 26a, 26b, and 26c is formed, and the common electrode 28 is transparent to the entire surface of the black matrix 25 and the color filter layer 26. Is formed.

On the other hand, although not shown in the drawings, in order to prevent leakage of the liquid crystal layer 30 interposed between the two substrates 10, 20, the two substrates 10, 20 are sealed with a sealing agent or the like along the edge thereof, The upper and lower alignment layers (not shown) for determining the initial molecular alignment direction of the liquid crystal are respectively interposed between the substrates 10 and 20 and the liquid crystal layer 30.

In addition, a first polarizing plate 50 is formed on an outer surface of the array substrate, that is, an outer surface of the first substrate 10, and a second polarizing plate is formed on an outer surface of the color filter substrate, that is, an outer surface of the second substrate 20. 50) is attached. In addition, a back-light is provided on an outer surface of the array substrate provided with the thin film transistor Tr, more precisely, an outer surface of the first polarizing plate 50 to supply light.

Accordingly, the on / off signal of the thin film transistor Tr is sequentially scanned and applied to the gate line (not shown) to provide data lines (not shown) to the pixel electrode 18 of the selected pixel region P. FIG. When the image signal is transmitted, the liquid crystal molecules of the liquid crystal layer 30 are driven by a vertical electric field between the pixel electrode 18 and the common electrode 28 so that the arrangement of the liquid crystal molecules is changed. Various images can be displayed by a change.

As described above, in the general liquid crystal display device 1, the first and second polarizing plates 50 and 52 are disposed on the outer surfaces of each of the array substrate and the color filter substrate so that the polarization axes are perpendicular to each other.

Referring to the structure of the second polarizing plate 52 of FIG. 1, the first and second polarizing plates 50 and 52 include a polarizer layer 52c having a polarization axis in one direction, and the polarizer layer 52c is formed. Tri-acetyl cellulose (TAC) layers 52b and 52d for supporting and protecting are provided on the lower and upper portions of the polarizer layer 52c, and an adhesive layer 52a is provided for adhesion to the substrate surface. The outermost surface protective film 52e is formed.

Here, the polarizer layer 52c is a polyvinyl alcohol (PVA) film is widely used, iodine molecules or dichroic dye having a dichroic property is arranged in parallel with the stretching direction of the PVA film, vibration in the stretching direction It transmits the light it makes and absorbs the rest of it. PVA film containing iodine shows a constant absorbance in all visible light region (400 ~ 800nm) has excellent transmittance and polarization characteristics, but has a disadvantage of poor heat and humidity. In particular, when left at a high temperature for a long time because of the high sublimation of iodine itself, as well as the polarization characteristics, the durability of the PVA film itself has a problem that is significantly reduced. Therefore, the TVA film is attached to the upper and lower surfaces of the PVA film to protect the PVA film.

However, since the material cost of TAC film is relatively expensive, it becomes a factor which raises the manufacturing cost of the liquid crystal display device provided with such a polarizing plate.

There is also a method of dyeing the dichroic dye on the PVA film instead of iodine, but it does not satisfy the transmittance and polarization.

On the other hand, since the base film itself, on which the polarizer layer 52c and the TAC layers 52b and 52d are formed, has a low flexibility and a hard material, a flexible display device that has recently been required for a display device for personalization devices. There is a problem in constructing.

In addition, the second polarizing plate 52 provided on the outer surface of the color filter substrate has a light loss due to the interface reflection, and the first and second polarizing plates 50 and 52 themselves are about 200 μm to 300 μm. Since the polarizing plates 50 and 52 having such thickness are attached to each other, it is hindering to manufacture a lightweight thin liquid crystal display device.

The liquid crystal display having such a configuration is modularized and supported and fixed through the top case, cover bottom, support main, etc. together with the backlight unit, and the top case is fastened to correspond to the side and top edges of the liquid crystal display.

In recent years, a bezel-minimized product can be implemented to produce a wider screen. FIG. 2 shows another conventional liquid crystal display device in which a top case without an upper frame is fastened. As shown in FIG. 2, in the top case 70, the upper surface 70a of the outer surface of the color filter substrate is more precisely removed, and the upper frame 70a overlapping with the second polarizing plate 52 is removed. By supporting, one end of the second polarizing plate 52 provided on the outer surface of the color filter substrate is exposed to the outside. In this case, external moisture, dust, and cleaning agents penetrate between the second polarizing plate 52 and the color filter substrate, thereby causing a peeling phenomenon of the second polarizing plate 52. This peeling of the second polarizing plate 52 causes a light leakage defect of the liquid crystal display device 1.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a lightweight, thin liquid crystal display device by omitting a polarizing plate on the outer surface of the color filter substrate.

The present invention simplifies the manufacturing process by omitting one polarizing plate in manufacturing a liquid crystal display, and another object of the present invention is to reduce the manufacturing cost of the liquid crystal display by omitting the polarizing plate.

In addition, another object of the present invention is to provide a liquid crystal display device capable of preventing a problem of peeling of the polarizer due to minimization of the bezel and preventing other light leakage defects.

In order to achieve the above object, the liquid crystal display device of the present invention, the first and second substrates facing each other, the lower polarizing plate formed on the outer surface of the first substrate, the thin film transistor formed on the inner surface of the first substrate A pixel electrode formed on an inner surface of the first substrate and connected to the thin film transistor, a common electrode corresponding to the pixel electrode to generate an electric field, an in-cell polarization layer formed on an inner surface of the second substrate, And a liquid crystal layer formed between the first and second substrates, wherein the in-cell polarization layer includes a reactive mesogen and a dichroic dye on smectic, and the dichroic dye is represented by Formula 1-1 below. It consists of the azo compound shown.

Formula 1 -One

The liquid crystal display of the present invention includes a black matrix formed under the in-cell polarization layer and having an opening corresponding to the pixel electrode, a color filter layer formed under the in-cell polarization layer and corresponding to the opening, It further includes an overcoat layer formed under the black matrix and the color filter layer.

A method of manufacturing a liquid crystal display according to the present invention includes forming a thin film transistor and a pixel electrode on a first substrate, and forming an in-cell polarization layer including a reactive mesogen and a dichroic dye on a second substrate on a second substrate. Forming a common electrode on the in-cell polarization layer, arranging the first and second substrates so that the pixel electrode and the common electrode face each other; Forming a liquid crystal layer between the substrates and attaching a lower polarizing plate to the outer surface of the first substrate, wherein the dichroic dye is formed of an azo compound represented by Chemical Formula 1-2.

Formula 1 -2

A method of manufacturing a liquid crystal display of the present invention includes forming a black matrix having an opening between the forming of the in-cell polarization layer and the forming of the common electrode, and forming a color filter layer corresponding to the opening. And forming an overcoat layer covering the black matrix and the color filter layer.

The polarizing layer for a display device of the present invention includes a reactive mesogen and a dichroic dye on smectic, and the dichroic dye is an azo compound represented by the following Chemical Formula 1-3.

Formula 1 -3

R in Chemical Formulas 1-1, 1-2, 1-3 includes -C _n H _{2n +1} (n is 1 to 10), -OH, -COOH, -CF ₃ , and -CHO.

The dichroic dye includes one or more of the azo compounds having different R's.

The liquid crystal display according to the present invention includes a polarizing layer for transmitting only light polarized in a predetermined direction without a TAC layer on the inner surface of the color filter substrate, thereby eliminating the polarizing plate provided on the outer surface of the color filter substrate. Therefore, there is an effect of providing a lightweight thin liquid crystal display device.

In addition, since only one polarizing layer is provided on the inner surface of the color filter, the polarizing layer having a polarizing function is omitted, thereby eliminating the process of attaching the polarizing plate, thereby simplifying the process, and eliminating one polarizing plate. Since there is no need to form a layer, there is an effect of reducing the material cost.

In addition, even if the upper frame of the top case is removed by minimizing the bezel part, the polarizing plate provided on the outer surface of the color filter substrate is omitted, so that problems such as peeling of the polarizing plate do not occur. It is effective.

1 is a cross-sectional view of a general liquid crystal display device.
2 is a schematic diagram of another conventional liquid crystal display device in which a top case without an upper frame is fastened.
3 is a view for explaining the principle of forming a polarizing layer using Smectic RM and a dichroic dye according to an embodiment of the present invention.
4 is a cross-sectional view schematically illustrating a liquid crystal display device according to an exemplary embodiment of the present invention.
5A through 5I are cross-sectional views illustrating a process of manufacturing a liquid crystal display device according to the present invention.

Hereinafter, a liquid crystal display including the polarizing layer and the same in a cell and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.

The polarizing layer according to the embodiment of the present invention is formed using a highly aligned smectic reactive mesogen (RM), a liquid crystal, and a dye having a high dichroic ratio. .

3 is a view for explaining the principle of forming a polarizing layer using Smectic RM and a dichroic dye according to an embodiment of the present invention.

As shown in FIG. 3, RM is a monomer molecule having a liquid crystal phase including a mesogen capable of expressing liquid crystal and a terminal functional group capable of polymerization, and used as an alignment host. When such RMs are cooled from the clearing point, the relatively low viscosity in the liquid crystal phase results in a large-area mono domain having a more oriented structure than in the case of using liquid crystal polymers of the same structure. Can be. Here, in particular, using the smectic phase RM having a high degree of alignment, it has a solid thin film form while maintaining the characteristics such as optical anisotropy and dielectric constant of the large-area liquid crystal crosslinked network film, and thus mechanically and thermally stable. do.

In Smectic RM having this property, dyes having a large liquid crystallinity and high dichroic ratio are mixed after synthesis. Subsequently, when the smectic RM is polymerized and cured by irradiation with ultraviolet rays or the like, the dichroic dye is arranged in the same alignment direction as the smectic RM having a high degree of alignment due to its liquid crystallinity. At this time, for the polymerization of smectic RM, a small amount of photoinitiator may be used.

Accordingly, the cured Smectic RM and the dichroic dye-containing layer may increase the difference in light absorption according to the polarization direction to serve as a polarizer. That is, when light is incident on the layer including the RM and the dichroic dye on the smectic, the polarized light is output by absorbing the component in the specific direction and passing the rest. Therefore, it can serve as a polarizing plate.

Here, the dichroic dye may be an azo compound, and may be made of a material represented by Formula 1 below.

Formula 1

Here, the reactor R may be -C _n H _{2n +1} (n is 1 to 10), or -OH, -COOH, -CF ₃ , or -CHO, and may include one or more dyes depending on the type of reactor. have.

Such a polarizing layer may be used as a polarizing plate of a liquid crystal display, and may be particularly formed inside a cell.

4 is a cross-sectional view schematically illustrating a liquid crystal display device according to an exemplary embodiment of the present invention, and includes a polarizing layer inside a cell.

As shown, the liquid crystal display device 100 according to the present invention includes a color filter substrate including a polarization layer 112, a color filter layer 117, and a common electrode 135, and a pixel electrode disposed below the color filter substrate. An array substrate including a 169 and a thin film transistor Tr, a liquid crystal layer 180 interposed between the two substrates, and a lower polarizer 170 attached to an outer surface of the array substrate.

In more detail, a plurality of gates and data are formed on and under the transparent first substrate 150 of the array substrate through a gate insulating film 155 and cross each other to define a plurality of pixel regions P. Wiring (not shown) is formed.

In addition, the gate electrode 153 and the gate insulating layer 155 may be connected to the gate line (not shown) and the data line (not shown) corresponding to each pixel area P, and may be sequentially stacked. In addition, the semiconductor layer 158 including the active layer 158a of pure amorphous silicon and the ohmic contact layer 158b of impurity amorphous silicon, and the thin film transistor Tr including the source and drain electrodes 161 and 163 spaced apart from each other Formed.

In this case, the gate electrode 153 branches from the gate wiring (not shown) or is formed as part of the gate wiring (not shown), and the source electrode 161 is the data wiring (not shown). Branched at, or as part of the data line (not shown).

In addition, a protective layer 165 is formed to cover the thin film transistor Tr and have a drain contact hole 167 exposing a part of the drain electrode 163 of the thin film transistor Tr.

The protective layer 165 is formed of a transparent conductive material, for example, indium tin oxide (ITO) or indium zinc oxide (IZO), and the drain electrode 163 through the drain contact hole 167. ) And a pixel electrode 169 positioned in each pixel region P is formed.

In addition, a lower polarizing plate 170 having a polarization axis in a first direction is attached to an outer surface of the array substrate, that is, an outer surface of the first substrate 150.

On the other hand, the in-cell polarization layer 112 is formed on the inner surface of the color filter substrate, that is, the inner surface of the second substrate 110. The in-cell polarization layer 112 is made of a dichroic dye having a relatively high dichroic ratio with smectic RM. The smectic RM is a material containing mesogen which can express liquid crystal and end groups capable of polymerization, and is characterized in that polymerization is possible by ultraviolet (UV) or heat. In addition, the dichroic dye is different in absorption ratio depending on the direction of incident light, it may be made of an azo compound. For example, the dichroic dye may be a material represented by Chemical Formula 1 mentioned above.

The in-cell polarization layer 112 formed of the smectic RM and the dichroic dye has a thickness of about 1 μm to about 10 μm. In-cell polarization layer 112 also has a polarization axis in a second direction perpendicular to the first direction.

Next, a lower portion of the in-cell polarization layer 112 corresponds to a data line (not shown), a gate line (not shown), and a thin film transistor Tr provided at the boundary of each pixel region P of the array substrate. The black matrix 115 in the form of a grid is formed to cover them and have a plurality of openings op1, op2, and op3 corresponding to the pixel region P. FIG.

A color filter layer 117 including red, green, and blue color filter patterns 117a, 117b, and 117c respectively corresponding to the openings op1, op2, and op3 is formed below the black matrix 115. Each of the red, green, and blue color filter patterns 117a, 117b, and 117c is sequentially arranged corresponding to the pixel area P. FIG.

Next, an overcoat layer 118 having a flat surface is formed under the color filter layer 117 to protect the color filter layer 117 and compensate for the step by the lower layer.

A common electrode 135 made of a transparent conductive material, for example, indium tin oxide (ITO) or indium zinc oxide (IZO), is formed under the overcoat layer 118 on the entire surface of the second substrate 110. have.

The liquid crystal display device 100 is formed by interposing a liquid crystal layer 180 between the array substrate and the color filter substrate having the above-described configuration and sealing the sealing material (not shown) along the edge thereof.

As described above, the liquid crystal display device 100 according to the present invention includes an in-cell polarization layer 112 having a polarization function for transmitting only light in a specific direction on an inner surface of the color filter substrate. Since the polarizing plate may be omitted, the polarizing plate may be provided only on the outer surface of the array substrate so as to realize a lightweight and thin shape.

In addition, since the liquid crystal display device 100 according to the present invention omits one polarizing plate, it does not require a TAC layer and a base film formed of an expensive material among the components having the polarizing plate, thereby reducing the manufacturing cost of the liquid crystal display device. It has an effect that can be reduced.

The manufacturing method of the liquid crystal display device according to the present invention will be described.

5A through 5I are cross-sectional views illustrating a process of manufacturing a liquid crystal display device according to the present invention.

First, as illustrated in FIG. 5A, a metal material is deposited and patterned on the transparent first substrate 150 to form a gate electrode 153 and a gate wiring (not shown). Subsequently, a silicon nitride film or a silicon oxide film is deposited on the gate electrode 153 and the gate wiring to form a gate insulating film 155. Next, a semiconductor layer 158 is formed on the gate insulating layer 155 including an active layer 158a of pure amorphous silicon and an ohmic contact layer 158b of amorphous silicon doped with impurities. Next, a metal material is deposited and patterned on the semiconductor layer 158 to form source and drain electrodes 161 and 163 spaced apart from each other. At this time, the pixel region is also formed with the data wiring (not shown) to cross the gate wiring. The semiconductor layer 158 and the source and drain electrodes 161 and 163 may be formed through one photolithography process using the same mask.

Subsequently, a passivation layer 165 is formed on the source and drain electrodes 161 and 163 and the data line, using a silicon nitride film, a silicon oxide film, or a benzocyclobutene or an acrylic resin, and patterned, thereby partially exposing the drain electrode 163. A contact hole 167 is formed. Next, a transparent conductive material is deposited and patterned on the passivation layer 165 to form the pixel electrode 169 contacting the drain electrode 163 through the contact hole 167.

Therefore, the array substrate can be completed through such a process.

Next, as shown in FIG. 5B, Smectic RM having end groups polymerizable by ultraviolet (UV) or heat and a dichroic dye having a high dichroic ratio are mixed and mixed with a solvent on the transparent second substrate 110. The polarizing material layer 112a is formed by jetting or applying the solution using an inkjet apparatus or a nozzle coating apparatus.

In this case, the terminal group that can be polymerized by ultraviolet light is any one of acrylate, ethylene, acetylene styrene, and the terminal group that can be polymerized by heat is oxetane ( It is preferable that it is oxetane) or epoxy.

In addition, the dichroic dye may be an azo compound, and the azo compound absorbs light of a specific wavelength band showing red, green, and blue colors by varying the conjugate length. To transmit.

Subsequently, as illustrated in FIG. 5C, the polarizing material layer 112a of FIG. 5B is applied to the substrate 110 on which the polarizing material layer 112a of FIG. 5B is formed by irradiating ultraviolet rays or applying heat. The polymerization reaction takes place between the forming smectic RMs. Here, an example is shown in which the polymerization reaction is generated by irradiating ultraviolet rays (UV) using the ultraviolet ray generator 195. In this case, the polarizer layer 112a of FIG. 5B may include a photoinitiator for the polymerization reaction.

On the other hand, in the case of polymerization by ultraviolet light (UV), the ultraviolet light (UV) having a wavelength of 200 nm to 400 nm is irradiated, and in the case of polymerization by heat, it proceeds in a temperature atmosphere of 100 to 300 ° C.

As shown in FIG. 3, in the solution state in which the smectic RM and the dichroic dye are mixed, the RM molecules and the dichroic dye molecules are in disorder. When the molecules form a liquid crystal phase by a predetermined temperature or higher in a disordered state, the disorder between the smectic RM molecules and the dichroic dye molecules is reduced, so that the smectic RM molecules are arranged in a constant direction. Dichroic dye molecules are also oriented by the arrangement of smectic RM molecules.

In this way, the end groups of the Smectic RM are connected to each other by a polymerization reaction generated by applying ultraviolet rays or heat while the Smectic RM molecules and the dichroic dye molecules are oriented, and thus the Smectic RM molecules are arranged in a uniform direction. By the polymerization reaction, the dichroic dye molecules are also aligned and fixed in the direction in which the smectic RM molecules are arranged.

When the smectic RM molecules and the dichroic dye molecules are arranged and fixed in one direction, the smectic RM molecules and the dichroic dye molecules serve as polarizers, and the in-cell polarization layer 112 having a function of transmitting only polarized light in a specific direction is formed.

Next, as shown in FIG. 5D, the in-cell polarization layer 112 is subjected to a heat treatment process on the in-cell polarization layer 112 having the polarization characteristic by ultraviolet (UV) or heat polymerization reaction. Completely cures.

When the polymerization reaction is performed by ultraviolet irradiation, since the in-cell polarization layer 112 is free of solvent, the dichroic polarization layer 125 applied on the second substrate 110 is in a solution state. Therefore, it is preferable to proceed with the heat treatment process to cure the dichroic polarizing layer 125.

On the other hand, when the polymerization reaction by heat, the polymerization reaction is generated by the added heat and all the solvent is removed, and proceeds with the curing of the dichroic polarizing layer 112 naturally, the in-cell polarizing layer The heat treatment process for curing 112 may be omitted. However, when the thermal polymerization reaction proceeds rapidly and the in-cell polarization layer 112 is not completely cured, the in-cell polarization layer 112 may be completely cured by performing the additional heat treatment. .

Next, as illustrated in FIG. 5E, a black material layer or black resin is deposited or coated on the entire surface of the second substrate 110 on which the in-cell polarization layer 112 is formed (not shown). And a patterning process to form a grating black matrix 115 having a plurality of first, second and third openings op1, op2 and op3.

Next, as shown in FIG. 5F, the red, green, and blue color filter patterns 117a, respectively, correspond to the plurality of first, second, and third openings op1, op2, and op3 exposed between the black matrices 115. The color filter layer 117 including 117b and 117c is formed.

Next, as illustrated in FIG. 5G, a transparent organic insulating material, for example, photo acryl or benzocyclobutene (BCB), is coated on the black matrix 115 and the color filter layer 117. An overcoat layer 118 having a flat surface is formed.

Next, as shown in FIG. 5H, a transparent conductive material, for example, indium tin oxide (ITO) or indium zinc oxide (IZO), is deposited on the overcoat layer 118 to form the common electrode 135. Forming the to form a color filter substrate for a liquid crystal display device according to the present invention.

Next, as illustrated in FIG. 5I, the pixel electrode 169 and the common electrode 135 may be disposed on the array substrate completed through the process of FIG. 5A and the color filter substrate completed through the process of FIGS. 5B to 5H. After placing them facing each other, a liquid crystal layer 180 is formed between these two substrates, and a seal pattern (not shown) is formed along the edge, and then the liquid crystal panel is completed by bonding. Subsequently, a lower polarizer 170 is attached to an outer surface of the array substrate of the liquid crystal panel.

In this case, the polarization axis of the lower polarizer 170 and the polarization axis of the in-cell polarization layer 112 formed on the inner surface of the color filter substrate are perpendicular to each other.

Next, although not shown in the drawings, the liquid crystal display device according to the present invention is completed by coupling and fixing the liquid crystal panel and the backlight unit through the top case, the cover bottom and the support main.

Here, the top case (not shown) may be formed of only a side frame without an upper frame overlapping the upper surface of the liquid crystal panel, thereby realizing a product having a minimized bezel portion.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

100: liquid crystal display device 150: first substrate
110: second substrate 112: in-cell polarizing layer
115: black matrix 117: color filter layer
118: overcoat layer 135: common electrode
153: gate electrode 155: gate insulating film
158: semiconductor layer 158a: active layer
158b: ohmic contact layer 161: source electrode
163: drain electrode 165: protective film
167: contact hole 169: pixel electrode
170: lower polarizer Tr: thin film transistor

Claims (10)

First and second substrates facing each other and spaced apart from each other;
A lower polarizer formed on an outer surface of the first substrate;
A thin film transistor formed on an inner surface of the first substrate;
A pixel electrode formed on an inner surface of the first substrate and connected to the thin film transistor;
A common electrode corresponding to the pixel electrode to generate an electric field;
An in-cell polarization layer formed on an inner surface of the second substrate;
Liquid crystal layer formed between the first and second substrate
Including,
The in-cell polarization layer includes a reactive mesogen and dichroic dye on smectic, and the dichroic dye is an azo compound represented by Chemical Formula 1 below.
Formula 1

The method of claim 1,
R in Formula 1 is -C _n H _{2n +1} (n is 1 to 10), and -OH, -COOH, -CF ₃ , and -CHO any one of -CHO.
The method of claim 2,
Wherein the dichroic dye comprises one or more of the azo compounds having different R's.
The method of claim 1,
A black matrix formed under the in-cell polarization layer and having an opening corresponding to the pixel electrode;
A color filter layer formed under the in-cell polarization layer and corresponding to the opening;
An overcoat layer formed under the black matrix and the color filter layer
Liquid crystal display further comprising.
Forming a thin film transistor and a pixel electrode on the first substrate;
Forming an in-cell polarizing layer comprising a reactive mesogen on smectic and a dichroic dye on a second substrate;
Forming a common electrode on the in-cell polarization layer;
Disposing the first and second substrates so that the pixel electrode and the common electrode face each other;
Forming a liquid crystal layer between the first and second substrates;
Attaching a lower polarizer to an outer surface of the first substrate
Including,
The dichroic dye is a method for producing a liquid crystal display device of the azo compound represented by the formula (1).
Formula 1

The method of claim 5, wherein
R in Chemical Formula 1 is -C _n H _{2n +1} (n is 1 to 10), -OH, -COOH, -CF ₃ and -CHO manufacturing method of a liquid crystal display device comprising any one.
The method according to claim 6,
And the dichroic dye comprises one or more of the azo compounds having different R's.
The method of claim 5, wherein
Between the forming of the in-cell polarization layer and the forming of the common electrode, forming a black matrix having an opening, forming a color filter layer corresponding to the opening, and forming the black matrix and the black matrix. Forming an overcoat layer covering the color filter layer further comprising the manufacturing method of the liquid crystal display device.
Reactive mesogen on smectic;
Dichroic dye
To include, wherein the dichroic dye is azo compound represented by the following formula (1) polarizing layer for a display device.
Formula 1

The method of claim 9,
R in Formula 1 is -C _n H _{2n +1} (n is 1 to 10), and -OH, -COOH, -CF ₃ and -CHO any one of the polarizing layer for a display device.

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