KR20120065748A - Liquid crystal display device including polarized material layer and method of fabricating the same - Google Patents

Abstract

PURPOSE: A liquid crystal display device and a manufacturing method thereof having a polarization layer are provided to omit a polarization layer having an external surface of a color filter substrate. CONSTITUTION: A polarization layer covers an overcoat layer. The polarization layer includes reactive mesogen and dichroic dye. The polarization layer has a polarization function with a polymerization reaction of the reactive mesogen. A transparent common electrode(135) covers the polarization layer. A liquid crystal layer(180) is arranged between the pixel electrode and the common electrode. A polarizing plate(170) includes in the outer surface of the first substrate.

Description

Liquid crystal display device having a polarizing layer therein and a method of manufacturing the same {Liquid crystal display device including polarized material layer and method of fabricating the same}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having a polarizing layer therein and a manufacturing method thereof.

Recently, liquid crystal displays have been spotlighted as next generation advanced display devices having low power consumption, good portability, high technology value, and high added value.

Of these liquid crystal display devices, an active matrix type liquid crystal display device having a thin film transistor, which is a switching device capable of controlling voltage on and off for each pixel, .

In general, a liquid crystal display device forms an array substrate and a color filter substrate through an array substrate manufacturing process for forming thin film transistors and pixel electrodes, and a color filter substrate manufacturing process for forming color filters and common electrodes, And a liquid crystal interposed therebetween.

In more detail, referring to FIG. 1, which is a cross-sectional view of a general liquid crystal display device, as shown, a general liquid crystal display device 1 includes an array substrate 10 and a color filter substrate with a liquid crystal layer 30 therebetween. 20 has a configuration in which the two sides face each other.

The lower array substrate 10 is provided with a plurality of gate lines (not shown) and data lines (not shown) that are arranged vertically and horizontally on the upper surface thereof to define a plurality of pixel regions P. A thin film transistor Tr is provided at an intersection point of the not shown and is connected one-to-one with the pixel electrode 18 provided in each pixel region P. FIG.

In addition, the color filter substrate 20 has a lattice shape surrounding each pixel region P to cover components such as the gate wiring (not shown), the data wiring (not shown), and the thin film transistor (Tr) on an inner surface thereof. A black matrix 25 of the color filter layer including the red, green, and blue color filter patterns 26a, 26b, and 26c sequentially arranged to correspond to each pixel area P in the lattice. 26 is formed, and a transparent common electrode 28 is provided over the entire surface of the black matrix 25 and the color filter layer 26.

Although not shown in the drawings, the two substrates 10 and 20 and the liquid crystal layers 10 and 20 are sealed with a sealing agent or the like along the edges to prevent leakage of the liquid crystal layer 30 interposed therebetween. An upper and lower alignment layer (not shown) is provided at the boundary of 30 to provide reliability in the molecular alignment direction of the liquid crystal.

In addition, a first polarizer 50 is attached to an outer surface of the array substrate 10, and a second polarizer 50 is attached to an outer surface of the color filter substrate 20.

In addition, the outer surface of the array substrate 10 having the thin film transistor Tr is more precisely provided with a backlight on the 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 wiring (not shown), so that the data wiring (not shown) is applied to the pixel electrode 18 of the selected pixel region P. FIG. When the image signal is transmitted, the liquid crystal molecules constituting the liquid crystal layer 30 are driven by the vertical electric field therebetween, and various images can be displayed by the change in the transmittance of light.

As described above, the general liquid crystal display device 1 includes first and second polarizing plates 50 and 52 such that polarization axes are disposed on the outer surfaces of the array substrate 10 and the color filter substrate 10 so as to be perpendicular to each other. It is common to be.

However, the second polarizing plate 52 provided on the outer surface of the color filter substrate 20 is causing light loss due to the interface reflection, and the first and second polarizing plates 50 and 52 themselves are 200 μm. Since it has a thickness of about 300 μm, two polarizing plates 50 and 52 having such a thickness are attached to each other, which is an obstacle in manufacturing a lightweight thin liquid crystal display device.

In addition, each of the first and second polarizing plates 50 and 52 is provided with a polarizer layer having a polarization axis in one direction on a base film and a TAC layer for supporting and protecting the polarizer layer, above and below the polarizer layer. In order to adhere | attach with a board | substrate surface, the adhesion layer is provided.

In this case, since the material cost of the TAC layer for protecting the polarizer layer is relatively high, the manufacturing cost of the liquid crystal display device including the polarizer is increased.

In addition, since the polarizer layer, the base film on which the TAC layer and the adhesive layer are formed, has a low flexibility and a hard material, there is a problem in forming a flexible display device that is a trend that is recently required for a display device for personalization devices. to be.

In the liquid crystal display having the above-described configuration, a top case is provided to support and fix the backlight unit and the liquid crystal display in the process of modularizing the liquid crystal display. The top case has side and top edges of the liquid crystal display. Is fastened to correspond to.

However, recently, as shown in FIG. 2 (an illustration of another conventional liquid crystal display in which a top case without an upper frame is fastened) for a product having a minimized bezel, the top case 70 may be The outer surface of the color filter substrate 20 more precisely by removing the upper frame 70a overlapping the second polarizing plate 52, the end of the second polarizing plate 52 provided on the outer surface of the color filter substrate 20 is external Is exposed. In this case, external moisture, dust, and cleaning chemicals penetrate between the second polarizing plate 52 and the color filter substrate 20, thereby causing a peeling phenomenon of the second polarizing plate 52.

Such peeling of the second polarizing plate 52 finally causes light leakage of the liquid crystal display device 1.

SUMMARY OF THE INVENTION 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 provided on an outer surface of the color filter substrate.

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

In addition, even if the top surface of the top case is removed by minimizing the bezel portion, it is another object of the present invention to provide a liquid crystal display device that does not cause peeling of the polarizing plate and further prevents light leakage due to peeling of the polarizing plate.

According to an aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, including: gate and data wirings defining a plurality of pixel regions crossing each other on a first substrate; Forming a connected thin film transistor and a pixel electrode connected to a drain electrode of the thin film transistor in the pixel region; Forming a black matrix having a plurality of openings exposing the plurality of pixel regions on an inner surface of a second substrate facing the first substrate; Forming a color converting material layer transmitting only light of a specific wavelength band in the plurality of openings; Forming an overcoat layer covering the color converting material layer; Forming a dichroic polarizing layer by covering the overcoat layer and coating a mixed solution of a reactive liquid crystal monomer (Reactive Mesogen) and a dichroic dye (Dichroic Dye); Allowing a polymerization reaction to occur between the reactive liquid crystal monomers in the dichroic polarizing layer to have a polarizing function; Forming a transparent common electrode covering the dichroic polarizing layer; Bonding the liquid crystal layer between the first substrate and the second substrate; Attaching a polarizing plate to an outer surface of the first substrate.

In this case, the plurality of openings are divided into a plurality of first, second and third openings, and the forming of the color conversion material layer transmitting only light of a specific wavelength band in the plurality of openings comprises: a first opening in the plurality of first openings; Forming a first color conversion pattern that transmits light of color; Forming a second color conversion pattern that transmits light of a second color in the plurality of second openings; And forming a third color conversion pattern or a transparent insulating pattern through the plurality of third openings to transmit light of a third color.

In addition, the color conversion material layer is made of a color conversion material that emits light of a specific wavelength band when a monochromatic light is incident, the color conversion material is an organic light emitting material or a quantum dot that is a fluorescent material having a high quantum efficiency Is characteristic.

The method may further include providing a backlight unit on an outer side surface of the polarizing plate, wherein the backlight unit may be configured as a light source using LEDs emitting one of red, green, and blue colors.

In this case, the reactive liquid crystal monomer (Reactive Mesogen) is characterized in that the material having a liquid crystal phase at a predetermined temperature, or a material showing a liquid crystal phase by adjusting the concentration through a solvent.

When the reactive liquid crystal monomer (Reactive Mesogen) is a material having a liquid crystal phase at a predetermined temperature, the polymerization reaction proceeds in a state in which the reactive liquid crystal monomer has a liquid crystal phase, the polymerization reaction is performed in the color filter layer of 200nm to 400nm It is a characteristic of ultraviolet-ray polymerization reaction which irradiates an ultraviolet-ray (UV) which has a wavelength band.

In addition, when the reactive liquid crystal monomer (Reactive Mesogen) is a substance showing a liquid crystal phase by concentration control via a solvent, the polymerization reaction proceeds in the state having a liquid crystal phase by controlling the concentration of the reactive liquid crystal monomer in the solvent The polymerization reaction may be a thermal polymerization reaction applying heat of 100 ° C. to 300 ° C. or an ultraviolet polymerization reaction of irradiating ultraviolet light (UV) having a wavelength band of 200 nm to 400 nm. And curing the polarizing layer of the resin by heat treatment.

In addition, the reactive liquid crystal monomer is characterized in that the terminal group can be polymerized by ultraviolet (UV) or heat, and the terminal group can be polymerized by ultraviolet ray (acrylate), ethylene (acetylene), acetylene (acetylene) styrene Any one of (stylene), and the end group capable of polymerization by heat is characterized by oxetane (oxetane) or epoxy (epoxy).

In addition, the dichroic dye (Dichroic Dye) is characterized in that the azo compound (azo compound), the azo compound (azo compound) by varying the conjugate length (conjugation length) of any one of the specific red or green It transmits light in the wavelength band, and the absorption ratio is different depending on the direction of incident light.

In addition, forming the dichroic polarizing layer includes the step of forming a light efficiency improving layer covering the overcoat layer, wherein the light efficiency improving layer is characterized by consisting of an inorganic insulating material or an organic insulating material.

According to an exemplary embodiment of the present invention, a liquid crystal display device includes a gate and data lines crossing each other to define a plurality of pixel regions, a thin film transistor connected to the gate and data lines, and a drain electrode of the thin film transistor in the pixel region. A first substrate having a pixel electrode connected thereto; A black matrix formed on the inner surface of the second substrate facing the first substrate and having a plurality of openings exposing the plurality of pixel regions; A color conversion material layer that transmits only light of a specific wavelength band formed in the plurality of openings; An overcoat layer covering the color conversion material layer; A polarizing layer covering the overcoat layer and made of a reactive liquid crystal monomer and a dichroic dye and having a polarizing function by a polymerization reaction of the reactive liquid crystal monomer; A transparent common electrode formed covering the polarization layer having the polarization function; A liquid crystal layer interposed between the pixel electrode and the common electrode; By including the polarizing plate provided on the outer surface of the first substrate, it is characterized in that only one polarizing plate is attached.

At this time, the backlight unit is provided on the outer surface of the polarizing plate, the backlight unit is characterized in that the LED light emitting any one of red, green, blue color as a light source.

In addition, a light efficiency improving layer made of an inorganic insulating material or an organic insulating material may be provided between the overcoat layer and the dichroic polarizing layer.

In addition, the plurality of openings are divided into a plurality of first, second, and third openings, and the color conversion material layer that transmits only light of a specific wavelength band formed in the plurality of openings includes a first color in the plurality of first openings. A first color conversion pattern transmitting light, a second color conversion pattern transmitting light of a second color through the plurality of second openings, and a third color transmitting light of a third color through the plurality of third openings It is characterized by consisting of a color conversion pattern or a transparent insulating pattern.

In this case, the color conversion material layer is made of a color conversion material that emits light of a specific wavelength band when a single color of light is incident, the color conversion material is an organic light emitting material or a quantum dot that is a fluorescent material having a high quantum efficiency Is characteristic.

In addition, the reactive liquid crystal monomer is characterized in that the terminal group can be polymerized by ultraviolet (UV) or heat, and the terminal group can be polymerized by ultraviolet ray (acrylate), ethylene (acetylene), acetylene (acetylene) styrene Any one of (stylene), and the end group capable of polymerization by heat is characterized by oxetane (oxetane) or epoxy (epoxy).

In addition, the dichroic dye (Dichroic Dye) is characterized in that the azo compound (azo compound), the azo compound (azo compound) by varying the conjugation length (conjugation length) light of a specific wavelength band of red, green, blue The absorption ratio is different depending on the direction of incident light.

The liquid crystal display according to the present invention includes a polarizing layer that transmits only the polarized light in a predetermined direction without a TAC layer on the inner surface of the color filter substrate, thereby omitting a polarizing plate provided on the outer surface of the color filter substrate. There is an effect to provide a device.

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

In addition, even if the top surface 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 deleted, so that problems such as peeling of the polarizing plate do not occur. It is effective to prevent.

1 is a schematic cross-sectional view of a conventional liquid crystal display device having a polarizer.
2 is a view showing another conventional liquid crystal display device fastening a top case without an upper frame.
3 is a cross-sectional view schematically showing a liquid crystal display device according to an exemplary embodiment of the present invention.
4A to 4H are cross-sectional views illustrating a process of manufacturing a liquid crystal display device according to the present invention;
5A to 5C illustrate a state in which a liquid crystal phase (FIG. 5A) and a liquid crystal phase (FIG. 5B) and a state of molecules arranged after the polymerization reaction of a material forming a color filter layer in the method of manufacturing a liquid crystal display device according to the present invention (FIG. Each schematically illustrating FIG. 5C).

Hereinafter, a liquid crystal display having a color filter layer having a polarization function and a method of manufacturing the same will be described with reference to the accompanying drawings.

3 is a cross-sectional view schematically illustrating a liquid crystal display device according to an exemplary embodiment of the present invention.

As shown, the liquid crystal display device 100 according to the present invention includes a color filter substrate 110 including a polarization layer, a color conversion layer, and a common electrode, and a pixel electrode 169 and a thin film transistor disposed at a lower side thereof. An array substrate 150 including Tr, a liquid crystal layer 180 interposed between the two substrates 110 and 150, and a polarizing plate 170 attached to an outer surface of the array substrate 150. It is configured.

In more detail, the configuration of the liquid crystal display device 100 according to the present invention will be described.

First, a plurality of gates and data wires (not shown) are formed on the array substrate 150 at lower and upper portions of the array substrate 150 through the gate insulating layer 155 and cross each other to define a plurality of pixel regions P. It is.

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

In this case, the gate electrode 153 is branched from the gate line (not shown) or is formed as part of the gate line (not shown), and the source electrode 161 is branched from the data line (not shown). Or part of the data wiring (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 conductive layer 165 is in contact with the drain electrode 163 through the drain contact hole 167 as a transparent conductive material, for example, indium tin oxide (ITO) or indium zinc oxide (IZO). The pixel electrode 169 is formed for each pixel region P. As shown in FIG.

In addition, a polarizing plate 170 having a polarization axis in a first direction is attached to an outer surface of the array substrate 150 in the same manner as the conventional liquid crystal display device (1 of FIG. 2).

On the other hand, the inner surface of the color filter substrate 110 having a characteristic configuration according to the present invention facing the array substrate 150 having such a configuration is a data line provided at the boundary of each pixel region of the array substrate 150 ( The black matrix 115 is formed to overlap the gate wiring (not shown), the thin film transistor Tr, and have a lattice shape having a plurality of openings op1, op2, and op3.

In the present invention, the color conversion material layer 117 is formed in each of the openings op1, op2, and op3 surrounded by the black matrix 115. In this case, the color converting material layer 117 converts the light of any wavelength band and emits light of the specific wavelength band. For example, even though light having blue color having a wavelength range of 430 nm to 470 nm is incident on the color converting material layer 117, the color is converted into a wavelength of 650 nm to 680 nm representing red or converted to a wavelength of 540 nm to 560 nm representing green and red or It is characterized by emitting green light.

The color converting material having such characteristics may be an organic light emitting material or a quantum dot as an example of an LED light source and a fluorescent material having high quantum efficiency.

In this case, a first color conversion material pattern 117a made of a first color conversion material emitting only light in a wavelength band of 650 nm to 680 nm is formed in the opening (hereinafter, referred to as a first opening op1) that should display red color. A second color conversion material pattern 117b made of a second color conversion material emitting only light in the wavelength range of 540 nm to 560 nm may be formed in the opening (hereinafter referred to as the second opening op2) that should display green.

Meanwhile, a transparent insulating material pattern (not shown) may be formed in the third opening op3 adjacent to the second opening op2, or a third color that emits only light in a wavelength range of 430 nm to 470 nm. A third color conversion material pattern 117c made of a conversion material may be formed.

The color conversion material layer 117 formed of the first, second, and third color conversion material patterns 117a, 117b, and 117c has a thickness of about 100 mW to 500 mW, and the insulating pattern also has a thickness of about 100 mW to 500 mW. It is characterized by being.

Meanwhile, according to the exemplary embodiment of the present invention, the color converting material layer 117 is composed of the first, second, and third color converting material patterns 117a, 117b, and 117c emitting red, green, and blue, or red. The first and second color converting material patterns 117a and 117b emitting green color and the transparent insulating pattern (not shown) are illustrated. However, this may be variously changed.

The color conversion material layer 117 having such a thickness has a thickness of about 1 μm to 2 μm, and the thickness of the color conversion material layer 117 is reduced by about 20 to 200 times compared to the color filter layer (26 of FIG. 1) formed. Light generated in the case of H) has a thickness of about 1 μm to 2 μm and has an effect of reducing the amount of light lost while passing through the formed color filter layer (26 of FIG. 1).

Next, an overcoat layer 118 having a flat surface for protecting the color conversion material layer 117 and compensating for the step is formed under the color conversion material layer 117.

In addition, a dichroic polarizing layer 125 is formed below the overcoat layer 118 to selectively transmit the polarizer and light of a specific wavelength band as another characteristic configuration of the present invention.

Next, a common electrode 135 made of a transparent conductive material is formed under the dichroic polarizing layer 125.

On the other hand, the dichroic polarizing layer 125 is characterized by having a polarizer therein to act as a polarizing plate is a dichroic dye having any one of a reactive liquid crystal monomer (Reactive Mesogen) and red, green, blue. (Dichroic Dye) is characterized by. At this time, in the embodiment of the present invention, the dichroic dye is shown as an example consisting of a dichroic dye showing blue.

On the other hand, the reactive liquid crystal monomer (Reactive Mesogen) is a liquid crystal material containing a polymerizable end group is characterized in that the polymerization by ultraviolet (UV) or heat.

In addition, the red, green, and blue dichroic dyes (Dichroic Dye) is a different absorption ratio depending on the direction of the incident light, for example characterized by consisting of an azo compound (azo compound).

The dichroic polarizing layer 125 formed of the reactive liquid crystal monomer (Reactive Mesogen) and the dichroic dye (Dichroic Dye) is characterized in that the thickness of about 1㎛ 10㎛.

The liquid crystal layer 180 is interposed between the array substrate 150 and the color filter substrate 110 having the above-described configuration and sealed as a sealing material (not shown) along the edge thereof to form the liquid crystal display device 100. .

At this time, although not shown in the drawings, the polarizing plate 170 having a polarizing layer arranged on the outer surface of the array substrate 150 in a direction perpendicular to the direction of the array of polarizers implemented in the dichroic polarizing layer 125. Is provided.

In addition, although not shown in the drawings, a light efficiency improving layer (not shown) may be further provided between the overcoat layer 118 and the dichroic polarizing layer 125 to improve light efficiency. The light efficiency improving layer (not shown) has a specific refractive index to implement a micro cavity effect, and transmits the light passing through the dichroic polarization layer 125 at the top to the upper portion, and the color conversion material layer By reflecting the light incident and reflected at 117, it finally plays a role of improving the light efficiency.

In the liquid crystal display device 100 according to the present invention having the above-described structure, an array substrate is provided on the inner surface of the color filter substrate 110 by providing a dichroic polarizing layer 125 having a polarizing function for transmitting only light in a specific direction. One polarizing plate 170 is provided only on the outer side of the 150, and the polarizing plate is omitted on the outer side of the color filter substrate 110 to realize a light weight.

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

In the liquid crystal display according to the present invention having the above-described configuration, a backlight unit (not shown) is provided under the polarizer 170, and the backlight unit (not shown) emits one of red, green, and blue colors. It includes an LED (not shown).

At this time, the LED (not shown) constituting the backlight unit (not shown) is characterized in that the LED (not shown) that emits the same color as the color of the dichroic dye constituting the dichroic polarizing layer 125.

That is, in the embodiment according to the present invention, since the dichroic dye forming the dichroic polarizing layer 125 is, for example, a blue dye, the LED is characterized by being composed of LEDs emitting blue light.

When the dichroic dye forming the dichroic polarizing layer 125 is a red or green dye, the LED may be an LED emitting red or green color.

Meanwhile, in the exemplary embodiment of the present invention, when the color converting material layer 117 includes first and second color converting material patterns 117a and 117b and an insulating pattern (not shown), the first and second colors are used. Although the conversion material patterns 117a and 117b are formed of color conversion materials emitting red and green colors, respectively, the conversion material patterns 117a and 117b may be variously changed.

That is, when the dichroic dye is a red dye among the components constituting the dichroic polarizing layer 125, the first and second color conversion material patterns 117a and 117b respectively emit green and blue colors. When the dichroic dye is a green dye, the first and second color converting material patterns 117a and 117b may be formed of a material emitting red and blue, respectively. It is characterized by consisting of a conversion material.

In the liquid crystal display according to the exemplary embodiment of the present invention having the above-described configuration, the thickness of the color converting material layer 117 to implement color is 20 to 200 times thinner than the conventional color filter layer 26 of FIG. 1. The thickness and the light efficiency are improved by reducing the amount of light lost by passing through the thickness.

Furthermore, the base film, the two TAC layers, and the adhesive layer may be omitted by omitting one polarizing plate compared to the conventional liquid crystal display device having the two polarizing plates 50 and 52 of FIG. 1. It realizes the light weight and improves the manufacturing cost.

Hereinafter, a method of manufacturing a liquid crystal display device according to the present invention will be described. In this case, in the liquid crystal display according to the present invention, since the array substrate is manufactured by a general manufacturing method, the description thereof is omitted, and a color having a dichroic polarizing layer and a color converting material layer, which are characteristic features of the present invention, is used. The manufacturing method of a filter substrate is demonstrated mainly.

4A to 4H are cross-sectional views illustrating a process of manufacturing a liquid crystal display device according to the present invention.

First, as illustrated in FIG. 4A, a black material layer (not shown) is formed by depositing (coating) a black-based metal material or black resin on the transparent insulating substrate 110.

Subsequently, the black material layer (not shown) is patterned by a mask process to form a black matrix 115 having a lattice shape having a plurality of first, second, and third openings op1, op2, and op3.

Next, as shown in FIG. 4B, the LED light source and the fluorescence having high quantum efficiency are used as color converting materials corresponding to the plurality of first, second and third openings op1, op2 and op3 exposed between the black matrices 115. For example, the color conversion material layer 117 is formed by applying or depositing an organic light emitting material or quantum dots.

In this case, a first color conversion material pattern 117a is formed in the plurality of first openings op1 to emit red light as an example of light representing one of red, green, and blue colors, and a plurality of second openings are formed. Op2 includes a second color conversion material pattern 117b for emitting green light as an example of light having a color different from that of the light emitted by the first color conversion material pattern 117a formed in the first opening op1. Form.

In addition, the plurality of third openings op3 may include a third color conversion outputting blue light as an example of light having a color different from that of the light emitted by the first and second color conversion material patterns 117a and 117b. The material pattern 117c is formed, or a transparent insulating pattern (not shown) is formed.

In this case, the first, second, and third color conversion material patterns 117a, 117b, and 117c and the transparent insulating pattern (not shown) may be formed to have a thickness of about 100 μs to about 500 μs. The first, second, and third color converting material patterns 117a, 117b, and 117c have a color reproducibility similar to that of a color filter layer having a thickness of about 1 μm to 2 μm in the aforementioned thickness range. Because.

Next, as shown in FIG. 4C, a transparent organic insulating material such as photo acryl or benzocyclobutene (BCB) is coated on the black matrix 115 and the color converting material layer 117 to form a surface thereof. The overcoat layer 118 which has this flat state is formed.

Next, as shown in FIG. 4D, the reactive liquid crystal monomer (Reactive Mesogen) consisting of a liquid crystal material having a terminal group capable of polymerization by ultraviolet (UV) or heat on the overcoat layer 118 may be any of red, green, and blue. Dichroic polarization in the state where no polarization function is exhibited in the present state by jetting or applying a solution of one color dichroic dye mixed with a solvent using an inkjet device 193 or a nozzle coating device. The material layer 124 is formed.

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 (Dichroic Dye) is characterized in that the azo compound (azo compound), the azo compound (azo compound) by varying the conjugation length (conjugation length) light of a specific wavelength band of red, green, blue And the absorption ratio is different depending on the direction of incident light.

Although not shown in the drawings, before forming the dichroic polarizing material layer 124 in which the polarizing function is not expressed, an organic insulating material having a specific refractive index or an inorganic insulating material is coated on the overcoat layer 118. The vapor deposition may further form a light efficiency improving layer (not shown). In this case, the specific refractive index of the light efficiency improving layer (not shown) is preferably 1.4 to 2.0, and may vary in the above-described range of the material forming the overcoat layer 118 and the dichroic polarizing layer 125.

Next, as shown in FIG. 4E, ultraviolet rays (UV) are irradiated or heat is applied to the substrate 110 on which the dichroic polarizing material layer (124 of FIG. 4D) is formed without the polarization function. As a result, a polymerization reaction is generated between the reactive liquid crystal monomers (Reactive Mesogen) forming the dichroic polarizing material layer (124 of FIG. 4D) in the state where the polarization function is not expressed. In the figure, an example is shown in which the polymerization reaction is generated by irradiating ultraviolet (UV) using the ultraviolet generator 195.

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

5A to 5C illustrate a liquid crystal phase (FIG. 5A) before and a polymerization reaction of a material forming the dichroic polarizing plate 125 and a molecule after the polymerization reaction in the method of manufacturing a liquid crystal display device according to the present invention. Fig. 5C is a diagram schematically showing the arrangement state of Fig. 5C.

As shown in FIG. 5A, the polarizing layer in a solution state in which a reactive liquid crystal monomer and a dichroic dye is mixed may include a reactive mesogen molecule 120 and a dichroic dye molecule 122. ) Is in a disordered state.

When the molecules form a liquid crystal phase by a predetermined temperature or above in a disordered state, as shown in FIG. 5B, the reactive liquid crystal monomer (Reactive Mesogen) molecule 120 and the dichroic dye (Dichroic Dye) molecule ( The disorder of the 122 is reduced so that the reactive mesogen molecules 120 are arranged in a constant direction, whereby the dichroic dye molecules 122 are also reactive mesogen molecules 120. The direction is influenced by the arrangement of the elements.

In this way, the reactive liquid crystal monomer (Reactive Mesogen) molecules and the dichroic dye molecules (122) are the words of the reactive liquid crystal monomer (Reactive Mesogen) by a polymerization reaction generated by applying ultraviolet light or heat in a state in which the aromatic 122 As the short term 121 is connected to each other, the reactive liquid crystal monomer (Reactive Mesogen) molecules 120 are maintained in a completely arranged state in a predetermined direction, and the dichroic dye molecules 122 are also reactive by the polymerization reaction. The liquid crystal monomer (Reactive Mesogen) molecules 120 are arranged in a direction aligned with and are fixed.

When the reactive liquid crystal monomer (Reactive Mesogen) molecules 120 are arranged and fixed in one direction, the polarizer plays a role of a polarizer. Thus, as shown in FIG. 4E, the dichroic polarizer layer having no polarization function is expressed. (124 in FIG. 4D) has a polarization characteristic to form a dichroic polarizing layer 125 having a function of transmitting only light polarized in a specific direction.

In addition, red, green, and blue colors are formed by the dichroic dye molecules (122 of FIG. 5C) arranged in one direction like the reactive liquid crystal monomer molecules (120 of FIG. 5C) in the dichroic polarizing layer 125. The dichroic polarizing layer 125 can display any one color of red, green, and blue by selecting and transmitting only light having a wavelength range of.

Next, as shown in FIG. 4F, the dichroic polarizing layer 125 is completely processed by performing a heat treatment process on the dichroic polarizing layer 125 having polarization characteristics by ultraviolet (UV) or heat polymerization reaction. Harden.

When the polymerization reaction by ultraviolet irradiation is performed, since the dichroic polarizing layer 125 is a state in which solvent is not removed, the dichroic polarizing layer 125 coated on the substrate 110 is in a solution state. It is preferable to proceed with the heat treatment to cure the dichroic polarizing layer 125.

On the other hand, when the polymerization reaction by heat is carried out, the polymerization reaction is generated by the applied heat and all solvents are removed, and the dichroic polarization layer 125 because it proceeds with the curing of the dichroic polarizing layer 125 naturally. The heat treatment process for curing) may be omitted. However, when the thermal polymerization reaction proceeds rapidly and the curing of the dichroic polarizing layer 125 is not completed, the dichroic polarizing layer 125 may be completely cured by performing the heat treatment process.

Next, as illustrated in FIG. 4G, a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) is deposited on the cured dichroic polarizing layer 125 to form a common electrode. 135 to form a color filter substrate 110 for a liquid crystal display device according to the present invention.

Next, as shown in FIG. 4H, a gate and a data line (not shown) defining a pixel region by crossing each other via a gate insulating film 155 on a general manufacturing process, that is, another transparent insulating substrate 150. Forming a thin film transistor Tr connected to the two wires (not shown) in each pixel region, and exposing a drain contact hole 163 of the thin film transistor Tr. And forming the pixel electrode 169 in contact with the drain electrode 163 through the drain contact hole 167 for each pixel region. After the substrate 150 and the color filter substrate 110 completed through the manufacturing steps described with reference to FIGS. 4A through 4G are positioned such that the pixel electrode 169 and the common electrode 135 face each other, Between the substrates 110 and 150 After forming a seal pattern (not shown) through the liquid crystal layer 180 along the edge, the liquid crystal panel is completed by bonding.

Thereafter, the polarizing plate 170 is attached to an outer surface of the array substrate 150 of the liquid crystal panel, and the module is processed to provide a backlight unit having an LED emitting one of red, green, and blue colors. And the top case (not shown) are fastened to the liquid crystal panel, thereby completing the liquid crystal display device 100 according to the present invention.

In this case, the polarization axis of the polarizing plate 170 and the polarization axis of the polarizer provided in the dichroic polarization layer 125 formed on the inner surface of the color filter substrate 110 are disposed so that the polarizing plate 170 orthogonal to each other. It is preferable to attach to the outer surface of the array substrate 150.

In addition, the backlight unit (not shown) is mounted on the liquid crystal panel having an LED that emits the same color as the color of the dichroic dye which is a component constituting the dichroic polarizing layer 125.

On the other hand, the top case (not shown) can implement a bezel minimizing product by fastening what consists of only the side frame without the upper frame overlapping the upper surface of the liquid crystal panel.

100 liquid crystal display device 110 color filter substrate
115: black matrix 117: color conversion material layer
117a, 117b, and 117c: first, second and third color conversion material patterns
118: overcoat layer 125: dichroic polarizing layer
135 common electrode 150 array substrate
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 layer
169: drain contact hole 170: polarizing plate
Tr: Thin Film Transistor

Claims (19)

Forming a gate and data wiring on the first substrate to define a plurality of pixel regions, a thin film transistor connected to the gate and data wiring, and a pixel electrode connected to a drain electrode of the thin film transistor in the pixel region. Wow;
Forming a black matrix having a plurality of openings exposing the plurality of pixel regions on an inner surface of a second substrate facing the first substrate;
Forming a color converting material layer transmitting only light of a specific wavelength band in the plurality of openings;
Forming an overcoat layer covering the color converting material layer;
Forming a dichroic polarizing layer by covering the overcoat layer and coating a mixed solution of a reactive liquid crystal monomer (Reactive Mesogen) and a dichroic dye (Dichroic Dye);
Allowing a polymerization reaction to occur between the reactive liquid crystal monomers in the dichroic polarizing layer to have a polarizing function;
Forming a transparent common electrode covering the dichroic polarizing layer;
Bonding the liquid crystal layer between the first substrate and the second substrate;
Attaching a polarizer to an outer surface of the first substrate
Method of manufacturing a liquid crystal display device comprising a.
The method of claim 1,
The plurality of openings are divided into a plurality of first, second and third openings,
Forming a color conversion material layer for transmitting only light of a specific wavelength band in the plurality of openings,
Forming a first color conversion pattern that transmits light of a first color in the plurality of first openings;
Forming a second color conversion pattern that transmits light of a second color in the plurality of second openings;
Forming a third color conversion pattern or a transparent insulating pattern through the plurality of third openings to transmit light of a third color;
Method of manufacturing a liquid crystal display device comprising a.
The method of claim 1,
The color conversion material layer is made of a color conversion material that emits light of a specific wavelength band when a single color of light is incident,
Wherein the color conversion material is an organic light emitting material or a quantum dot, which is an LED light source and a fluorescent material having high quantum efficiency.
The method according to any one of claims 1 to 3,
Further comprising a backlight unit on the outer surface of the polarizing plate,
The backlight unit is a manufacturing method of a liquid crystal display device, characterized in that the LED that emits any one of red, green, blue color as a light source.
The method of claim 4, wherein
The reactive liquid crystal monomer (Reactive Mesogen) is a material having a liquid crystal phase at a predetermined temperature,
Or a substance which exhibits a liquid crystal phase by adjusting the concentration via a solvent.
The method of claim 5, wherein
When the reactive liquid crystal monomer (Reactive Mesogen) is a material having a liquid crystal phase at a predetermined temperature, the polymerization reaction proceeds in a state in which the reactive liquid crystal monomer has a liquid crystal phase, the polymerization reaction is performed in the color filter layer of 200nm to 400nm It is an ultraviolet-ray polymerization reaction which irradiates an ultraviolet-ray (UV) which has a wavelength band, The manufacturing method of the liquid crystal display device characterized by the above-mentioned.
The method of claim 5, wherein
When the reactive liquid crystal monomer (Reactive Mesogen) is a substance showing a liquid crystal phase by concentration control through a solvent, the polymerization reaction proceeds in the state having a liquid crystal phase by controlling the concentration of the reactive liquid crystal monomer in the solvent, The polymerization reaction is a method of manufacturing a liquid crystal display device, characterized in that the thermal polymerization reaction to apply a heat of 100 ℃ to 300 ℃ or an ultraviolet polymerization reaction to irradiate ultraviolet (UV) having a wavelength band of 200nm to 400nm.
The method of claim 7, wherein
And hardening the dichroic polarizing layer subjected to the ultraviolet polymerization reaction by heat treatment.
The method of claim 4, wherein
The reactive liquid crystal monomer is characterized in that the terminal group can be polymerized by ultraviolet (UV) or heat, and the terminal group can be polymerized by ultraviolet (acrylate), ethylene (etylene), acetylene (acetylene) styrene (stylene) The terminal group which can be superposed | polymerized by heat is an oxetane or epoxy, The manufacturing method of the liquid crystal display device characterized by the above-mentioned.
The method of claim 4, wherein
The dichroic dye (Dichroic Dye) is characterized in that the azo compound (azo compound), the azo compound (azo compound) by changing the conjugation length (conjugation length) of any one of the specific wavelength band of red, green, blue A method of manufacturing a liquid crystal display device, wherein light is transmitted and absorption ratios are different depending on the direction of incident light.
The method of claim 4, wherein
Forming a light efficiency improving layer covering the overcoat layer to form the dichroic polarizing layer
Method of manufacturing a liquid crystal display device comprising a.
The method of claim 11,
And the light efficiency improving layer is made of an inorganic insulating material or an organic insulating material.
A first substrate including gate and data lines crossing each other to define a plurality of pixel regions, a thin film transistor connected to the gate and data lines, and a pixel electrode connected to a drain electrode of the thin film transistor in the pixel region;
A black matrix formed on the inner surface of the second substrate facing the first substrate and having a plurality of openings exposing the plurality of pixel regions;
A color conversion material layer that transmits only light of a specific wavelength band formed in the plurality of openings;
An overcoat layer covering the color conversion material layer;
A polarizing layer covering the overcoat layer and made of a reactive liquid crystal monomer and a dichroic dye and having a polarizing function by a polymerization reaction of the reactive liquid crystal monomer;
A transparent common electrode formed covering the polarization layer having the polarization function;
A liquid crystal layer interposed between the pixel electrode and the common electrode;
Polarizing plate provided on the outer surface of the first substrate
By attaching only one polarizing plate by including a liquid crystal display device.
The method of claim 13,
The backlight unit is provided on the outer surface of the polarizing plate,
The backlight unit is a liquid crystal display, characterized in that the LED as a light source for emitting any one of red, green, blue.
15. The method of claim 14,
And a light efficiency improving layer made of an inorganic insulating material or an organic insulating material between the overcoat layer and the dichroic polarizing layer.
15. The method of claim 14,
The plurality of openings are divided into a plurality of first, second and third openings,
The color conversion material layer that transmits only light of a specific wavelength band formed in the plurality of openings may include a first color conversion pattern that transmits light of a first color through the plurality of first openings, and a plurality of second openings. And a second color conversion pattern for transmitting light of two colors, and a third color conversion pattern or a transparent insulating pattern for transmitting light of a third color through the plurality of third openings.
17. The method of claim 16,
The color conversion material layer is made of a color conversion material that emits light of a specific wavelength band when a single color of light is incident,
Wherein the color conversion material is an organic light emitting material or a quantum dot, which is an LED light source and a fluorescent material having high quantum efficiency.
15. The method of claim 14,
The reactive liquid crystal monomer is characterized in that the terminal group can be polymerized by ultraviolet (UV) or heat, and the terminal group can be polymerized by ultraviolet (acrylate), ethylene (etylene), acetylene (acetylene) styrene (stylene) ), And the terminal group capable of polymerization by heat is oxetane or epoxy.
15. The method of claim 14,
The dichroic dye (Dichroic Dye) is characterized in that the azo compound (azo compound), the azo compound (azo compound) transmits light of a specific wavelength band of red, green, blue by varying the conjugate length (conjugation length) And absorption ratios vary depending on the direction of incident light.

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