KR102120806B1 - Polarizing sheet with quantum rod and method of fabricating the same, and liquid crystal display device including the same - Google Patents

Abstract

The present invention, a plurality of partition walls formed on a transparent first substrate having a first width, a first height and a first separation distance and extending in one direction; A quantum rod layer having a plurality of quantum rods formed in correspondence to a separation region between the partition walls and having long axes aligned in the longitudinal direction of the partition walls; Provided is a polarizing sheet comprising a transparent second substrate provided covering the partition wall and the quantum rod layer, a manufacturing method thereof, and a liquid crystal display device having the polarizing sheet.

Description

A polarizing sheet and a manufacturing method thereof and a liquid crystal display device including the polarizing sheet {Polarizing sheet with quantum rod and method of fabricating the same, and liquid crystal display device including the same}

The present invention relates to a polarizing sheet having a quantum rod, particularly a polarizing sheet having a quantum rod layer in which a plurality of quantum rods are well arranged in one direction so as to have polarization characteristics, and a manufacturing method thereof, and a quantum rod thus manufactured. The present invention relates to a liquid crystal display device having improved transmittance and luminance characteristics by including a polarizing sheet.

As the society has entered a full-fledged information age, the display field for processing and displaying a large amount of information has rapidly developed, and in response, a liquid crystal display device (LCD), a plasma display device (Plasma Display) Various flat panel display devices, such as panel device (PDP), field emission display device (FED), and organic light emitting diode display device (OELD) have been developed and are in the spotlight.

Among these various flat panel display devices, the liquid crystal display device is receiving the most attention because it has low power consumption, excellent resolution and video realization ability, and furthermore, the manufacturing cost is relatively small compared to other flat panel display devices.

Meanwhile, referring to FIG. 1, which is a cross-sectional view of a general liquid crystal display device, the general liquid crystal display device 1 includes an array substrate 10 equipped with a thin film transistor Tr as a switching element and a pixel electrode 18 connected thereto, and a pool. A color filter substrate 20 provided with a color filter layer 26 for color realization, and a liquid crystal panel 40 including a liquid crystal layer 30 interposed between the two substrates 10 and 20, and the liquid crystal panel It comprises a pair of polarizing plates (50, 52) provided on the outer surface of the (40) and a backlight unit (BLU) provided on one outer surface of the first polarizing plate (50).

The array substrate 10 is provided with a plurality of gate wirings (not shown) and data wirings (not shown) which are arranged vertically and horizontally on the top surface to define a plurality of pixel areas P, and these two wirings (not shown) ), the thin film transistor Tr is provided at a crossing point, and is in one-to-one correspondence with the pixel electrode 18 provided in each pixel region P.

In addition, the color filter substrate 20 has a grid covering each pixel area P to cover components such as the gate wiring (not shown), data wiring (not shown), and a thin film transistor Tr on its inner surface. A black matrix 25 having a shape is formed, and color filter layers including red, green, and blue color filter patterns 26a, 26b, and 26c sequentially arranged to correspond to each pixel region P in these grids 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.

In addition, although not shown in the drawings, these two substrates 10 and 20 form a state sealed with a sealing agent (not shown) along the edge to prevent leakage of the liquid crystal layer 30 interposed therebetween, and each substrate 10 , 20) and upper and lower alignment layers (not shown) that impart reliability to the molecular alignment direction of the liquid crystal are interposed at the boundary between the liquid crystal layer 30 and the liquid crystal layer 30.

In addition, a first polarizing plate 50 is attached to an outer surface of the array substrate 10, and a second polarizing plate 52 is attached to an outer surface of the color filter substrate 20.

In addition, a backlight unit (BLU) is provided on the outer surface of the array substrate 10 provided with the thin film transistor Tr, and more precisely, the outer surface of the first polarizing plate 50 to supply light.

Therefore, in the liquid crystal display device having such a configuration, the on/off signals of the thin film transistor Tr are sequentially scanned and applied through the gate wiring (not shown), and the pixel electrode 18 of the selected pixel region P is applied. ), when an image signal of a data line (not shown) is transmitted, liquid crystal molecules constituting the liquid crystal layer 30 are driven by a vertical electric field therebetween, and various images can be displayed according to the change in light transmittance. .

On the other hand, as described above, the general liquid crystal display device 1 is a liquid crystal panel 40 consisting of an array substrate 10 and a color filter substrate 20 bonded to each other via a liquid crystal layer 30 and such a liquid crystal panel ( 40) It is common that the first and second polarizing plates 50 and 52 are configured such that polarization axes are disposed so as to be orthogonal to each other on each outer surface.

Therefore, the light from the backlight unit (BLU) passes through the first polarizing plate 50 and injects only the first linearly polarized light into the liquid crystal panel 40 in one direction, and the first linearly polarized light is the liquid crystal layer. The second linearly polarized light passes through (30), and the second linearly polarized light passes through the second polarizing plate 52 and finally enters the user's eyes to display an image.

On the other hand, the pair of polarizing plates 50 and 52 provided in the general liquid crystal display device 1 having such a configuration divides the incident light into two orthogonal polarization components and passes only one of them to absorb or disperse the other components. It consists of several layers as shown.

2 is a schematic cross-sectional view of a polarizing plate provided in a conventional general liquid crystal display device.

As shown in the drawing, each of the polarizing plates 50 provided on the outer surfaces of the respective substrates (10, 20 of FIG. 1) of the liquid crystal display (1 of FIG. 1) PVA serving to polarize the incident light therein. A polymer polarizing medium layer 56 made of (polyvinyl alcohol) is formed, and the first and second supports made of tri-acetyl-cellulose (TAC) are formed on the upper and lower portions of the polymer polarizing medium layer 56. Layers 55 and 57 are formed, an adhesive layer 52 is formed under the second support layer 57, and a protective film 51 is disposed under the adhesive layer 52 to form the first support layer. (55) Base films 58 are formed on the upper portions.

The light incident on the polarizing plate 50 having such a configuration passes through the polymer polarization medium layer 56 and has polarization characteristics, but most of the incident light is absorbed by the polymer polarization medium layer 56, thereby rapidly brightening the luminance characteristics. This is reduced.

Accordingly, referring to FIG. 1, the conventional liquid crystal display device 1 having such a configuration passes through the first and second polarizing plates 50 and 52 even if light is lost when passing through the liquid crystal panel 40 itself. While the amount of light lost is very high, only light at a level of about 5% to 6% of light emitted from the backlight unit (BLU) is finally incident into the user's eyes, so the efficiency of use of light is not very good.

Therefore, in recent years, a lot of efforts have been made to improve the transmittance and luminance characteristics of the liquid crystal display device.

The present invention has been devised to solve the above-mentioned problems, and an object thereof is to provide a polarizing sheet having excellent luminance characteristics after transmission and a method for manufacturing the same since the amount of light is hardly reduced even though it passes through the inside.

Furthermore, it is an object of the present invention to provide a liquid crystal display device having high luminance characteristics by improving the transmittance of light generated from a backlight unit by minimizing the amount of light lost by passing through the first and second polarizing plates.

A polarizing sheet according to an embodiment of the present invention for achieving the above object, the first width and the first height and the first separation distance on the transparent first substrate having a plurality of partition walls formed extending in one direction; A quantum rod layer having a plurality of quantum rods formed in correspondence with the separation region between the partition walls and having long axes aligned in the longitudinal direction of the partition walls; And a second transparent substrate provided over the partition wall and the quantum rod layer.

At this time, the shortened length of the quantum rod is characterized in that 3nm to 100nm.

In addition, the first spacing is 5 to 50 times the shortening length of the quantum rod, the first width is 1/100 to 1 times the first spacing, and the first height is shorter than the shortening length of the quantum rod. It is large and is characterized by 5nm to 100㎛.

On the other hand, the quantum rod layer is characterized in that it further comprises a binder resin, wherein the binder resin is a polymer having transparency, and is characterized in that it is a polyester (Polyester) comprising an amine (amine) and hydroxy (Hydroxy) groups. .

In addition, the quantum rod is made of only a core, or a core and a shell surrounding the core, the quantum rod has a shape having a short axis and a long axis, and the ratio of the short axis to the long axis is 1:1.1 to 1:30. It is characteristic.

At this time, the core is characterized by being made of semiconductors, alloys, or mixed materials of group II-VI, III-V, III-VI, VI-IV, and IV on the periodic table, and the core of the quantum rod is group II-VI When made, CdSe, CdS, CdTe, ZnO, ZnSe, ZnS, ZnTe, HgSe, HgTe, CdZnSe, or a mixture of two or more substances, and a III-V group, InP, InN , GaN, InSb, InAsP, InGaAs, GaAs, GaP, GaSb, AlP, AlN, AlAs, AlSb, CdSeTe, ZnCdSe, or a mixture of two or more materials, consisting of Group VI-IV , PbSe, PbTe, PbS, PbSnTe, Tl ₂ SnTe ₅ , or is characterized in that it consists of a mixture of two or more substances.

In addition, the quantum rod layer is characterized by fluorescence of monochromatic light when light of a specific wavelength band enters the quantum rod layer, wherein the quantum rod layer is characterized in that all of the quantum rod having a long axis of the same size.

In addition, the quantum rod layer is characterized in that it emits white when light of a specific wavelength band enters the quantum rod layer, wherein the quantum rod layer has different sizes for each separation region located between the partition walls. It is characterized by forming a mixture of quantum rods having a long axis.

In addition, when three spaced areas adjacent to each other are defined as one group and three spaced areas within each group are sequentially defined as first, second, and third quantum lines, the first quantum line is a long axis length that fluoresces red. A quantum rod layer having a quantum rod having a quantum rod layer is provided, and the second quantum line is provided with a quantum rod layer having a quantum rod having a long axis length that fluoresces green, and the third quantum line is fluorescing blue. A quantum rod layer having a quantum rod having a long axis length is provided, or the first quantum line is provided with a quantum rod layer having quantum rods having first and second long axis lengths that fluoresce red and green, The second quantum line is provided with a quantum rod layer having quantum rods having first and third long-axis lengths that fluoresce red and blue, and the third and third fluorescence fluorescence blue and green lines are provided in the third quantum line. It is characterized by having a quantum rod layer having a quantum rod having a long axis length.

A method of manufacturing a polarizing sheet according to an embodiment of the present invention includes: forming a plurality of partition walls having a first width, a first height, and a first separation distance on a transparent first substrate and extending in one direction; Forming a quantum rod layer having a plurality of quantum rods, characterized in that a long axis is aligned in a lengthwise direction of the partition wall in correspondence to a separation region between the partition walls; And covering the partition wall and the quantum rod layer so as to face the transparent second substrate, and then providing an encapsulant along the edges of the first or second substrate and bonding the first and second substrates.

At this time, the step of forming a quantum rod layer having a plurality of quantum rods, characterized in that the long axis is aligned in the longitudinal direction of the partition wall corresponding to the separation region between each partition, the separation region between each partition wall Forming a liquid quantum rod layer by coating the quantum rod solution while moving the bar in the lengthwise direction of the partition using a bar coating device provided with a quantum rod solution; And heat-treating and curing the liquid quantum rod layer.

In addition, the step of forming a quantum rod layer having a plurality of quantum rods, characterized in that the major axis is aligned in the longitudinal direction of the partition wall corresponding to the separation region between each partition, the separation region between each partition wall Correspondingly, the head of the inkjet apparatus or the nozzle of the nozzle coating apparatus proceeds along the longitudinal direction of the partition wall using an ink jet device or a nozzle coating device provided with the quantum rod solution, so that the quantum rod solution is longitudinal direction of the partition wall. Forming a liquid quantum rod layer by coating the quantum rod solution so as to be sprayed along; And heat-treating and curing the liquid quantum rod layer.

In this case, when three spaced areas adjacent to each other are defined as one group and three spaced areas within each group are sequentially defined as first, second, and third quantum lines, each of the first, 2, and 3 quantum lines is different from each other. It is characterized by selectively coating a quantum rod solution having a long axis length.

And forming a quantum rod layer having a plurality of quantum rods, characterized in that the long axis is aligned in the longitudinal direction of the partition wall corresponding to the separation region between each partition, corresponds to the separation region between each partition wall Forming a liquid quantum rod layer by spin coating the quantum rod solution by using a spin bar coating apparatus having a quantum rod solution; And heat-treating and curing the liquid quantum rod layer.

In addition, the step of forming a plurality of barrier ribs having a first width, a first height and a first separation distance and extending in one direction on a transparent first substrate, forms a photosensitive layer having a photosensitive property on the first substrate A step of doing; Performing selective exposure on the photosensitive layer; And developing the exposed photosensitive layer.

At this time, the step of forming a first material layer on the first substrate prior to forming the photosensitive layer, and comprising the step of developing the exposed photosensitive layer is exposed to the outside of the developed photosensitive layer afterwards 1 etching the material layer and stripping and removing the photosensitive layer.

On the other hand, the shortening length of the quantum rod is 3nm to 100nm, the first spacing is 5 to 50 times the shortening length of the quantum rod, and the first width is 1/100 to 1 times the first spacing. , The first height is larger than the shortened length of the quantum rod and is characterized in that it is 5nm to 100㎛.

A liquid crystal display device according to an embodiment of the present invention, the liquid crystal display device having a polarizing sheet according to any one of claims 1 to 13, an array substrate, a counter substrate, the array substrate and A liquid crystal panel including a liquid crystal layer interposed between opposing substrates, and a polarizing plate attached to an outer surface of the opposing substrate of the liquid crystal panel; It is located on the outer surface of the array substrate of the liquid crystal panel, and the polarization sheet so that the polarization axis of the polarizing plate and the longitudinal direction of the partition wall of the polarizing sheet are arranged parallel or vertical; And a backlight unit provided under the polarizing sheet.

A polarizing sheet according to an embodiment of the present invention is characterized in that a quantum rod layer having a quantum rod well aligned in one direction is provided instead of a polymer polarizing medium layer therein.

Therefore, when light is incident on the polarizing sheet having such a configuration, the quantum rod layer receives the incident light and acts to fluoresce light in a specific wavelength band, and at the same time, the polarization characteristic is added in the aligned direction, thereby implementing the present invention. The polarizing sheet according to the example has an advantage of excellent transmittance and luminance characteristics compared to a polarizing plate provided with a general polymer polarizing medium layer.

Furthermore, the polarizing sheet forms a plurality of barrier ribs at regular intervals on the inner surface of one substrate, and the quantum rods inside the quantum rod layer provided between the barrier ribs are automatically aligned by the barrier ribs, thereby allowing a direction in one direction. It has the advantage of simplifying the method of manufacturing a polarizing sheet having an aligned quantum rod and improving the alignment characteristics of the quantum rod itself.

Further, the liquid crystal display device according to an embodiment of the present invention is generated from a backlight unit compared to a general liquid crystal display device by providing a polarizing sheet having a quantum rod well arranged in one direction instead of a polarizing plate interposed between the backlight unit and the liquid crystal panel. It has the effect of improving the transmittance and luminance characteristics of the light, thereby reducing the power consumption of the liquid crystal display device.

1 is a schematic cross-sectional view of a conventional liquid crystal display device.
2 is a schematic cross-sectional view of a polarizing plate provided in a conventional general liquid crystal display device.
3 is a view showing a general form of the quantum rod.
4 is a perspective view of a polarizing sheet having a quantum rod according to an embodiment of the present invention.
5 is a cross-sectional view of a portion of FIG. 4 taken along line III-III.
6A to 6D are views showing various configurations of the quantum rod layer in the polarizing sheet according to the embodiment of the present invention.
7 is a schematic cross-sectional view of a portion of a display area of a liquid crystal display having a polarizing sheet having a quantum rod according to an embodiment of the present invention.
8A to 8E are cross-sectional views of manufacturing steps of a polarizing sheet according to an embodiment of the present invention.
FIG. 9 shows a long axis of a quantum rod in a quantum rod layer when a quantum rod layer is formed using a bar coating device, respectively, on a substrate having a partition formed in accordance with the present invention and a substrate having no partition walls as a comparative example. Drawing showing the alignment of the direction.
FIG. 10 shows a long axis of a quantum rod in a quantum rod layer when a quantum rod layer is formed using a spin coating device on a substrate having no partition walls according to the present invention and a substrate having no partition walls as a comparative example. Drawing showing the alignment of the direction.
11 is a graph in which polarization characteristics are measured by irradiating light of a specific wavelength band with a quantum rod layer formed through a bar coating device on a substrate having a barrier rib according to the present invention.
12 is a graph measuring polarization characteristics by irradiating light of a specific wavelength band to a substrate according to a comparative example in which a quantum rod layer is formed through a bar coating device without a partition wall.

Hereinafter, a polarizing sheet having a quantum rod and a manufacturing method thereof and a liquid crystal display device having the polarizing sheet according to the present invention will be described with reference to the accompanying drawings.

First, first, a quantum rod, which is one component constituting a polarizing sheet having a quantum rod according to an embodiment of the present invention, will be briefly described.

3 is a view showing a general form of the quantum rod.

As shown, the quantum rod (quantum rod) 156 is composed of a core (core) 157 forming a center and a shell (shell) 158 surrounding the core 157.

In this case, although the drawings show that the quantum rod 156 is composed of a core 157 and a shell 158 surrounding it as an example, the shell 158 may be omitted, and in this case, the quantum rod is a core ( 157).

The core 157 may have any one of a spherical shape, an elliptical sphere, a polyhedron, and a rod shape. In the drawing, it is illustrated that the core 157 forms a spherical shape.

On the other hand, when forming the quantum rod 156 only with the core 157, the core 157 is characterized by forming an elliptical sphere or a rod shape.

In addition, when the quantum rod 156 includes a shell 158 surrounding the core 157, the core 157 may form any of a sphere, ellipsoid, polyhedron, and rod shape, and the shell surrounding it 158 has a rod shape having a long axis and a short axis, and the cut surface cut in the short axis direction of the quantum rod 156 may form any one of a circle, ellipse, and polygonal shape.

In addition, the shell 158 may have a single-layer or multi-layer structure, and may be made of an alloy, an oxide-based material, or a material mixed with any one or more of impurities. At this time, the shell 158 is characterized in that the ratio of the short axis to the long axis has a range of 1:1.1 to 1:30, which can have various ratios.

In addition, the core 157, which is a component of the quantum rod 156 having such a configuration, is a semiconductor of the II-VI, III-V, III-VI, VI-IV, and IV groups of the periodic table, or a mixture thereof. It can be made of materials.
When the core 157 of the quantum rod 156 is made of group II-VI of the periodic table, any one of CdSe, CdS, CdTe, ZnO, ZnSe, ZnS, ZnTe, HgSe, HgTe, CdZnSe, CdSeTe, ZnCdSe Alternatively, two or more materials may be mixed materials.
And when the core 157 of the quantum rod 156 is made of group III-V of the periodic table, InP, InN, GaN, InSb, InAsP, InGaAs, GaAs, GaP, GaSb, AlP, AlN, AlAs, AlSb It may be made of one material or a mixture of two or more materials.
In addition, when the core 157 of the quantum rod 156 is composed of a group III-IV-VI of the periodic table, it is made of Tl ₂ SnTe ₅ , In addition, when the core 157 of the quantum rod 156 is made of group VI-IV of the periodic table, PbSe, PbTe, PbS, PbSnTe It can be made of any one material or a mixture of two or more materials.

On the other hand, the quantum rod 156 having a specific long axis to short axis ratio has a characteristic in that the fluorescence wavelength varies depending on the length of the long axis of the quantum rod 156 even if it is composed of a core 157 made of the same material.

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That is, the quantum rod 156 produces fluorescence of a relatively short wavelength as the length of the long axis becomes smaller, and generates fluorescence of a long wavelength as the length of the long axis increases.

Therefore, the quantum rod 156 can fluoresce light in a desired visible light region by adjusting its long axis length, and the quantum rod 156 has its own quantum efficiency theoretically 100%, so it can achieve very strong fluorescence. It is characterized by being able to generate.

Furthermore, since the quantum rod 156 has a shape of a long axis and a short axis, in particular, when the arrangement direction of the long axis is constant, light having polarization characteristics is emitted in the direction in which the long axis is disposed.

Accordingly, the present invention proposes a method in which its long axis can be well arranged in one direction by using the quantum rod 156 having the above-described characteristics, and furthermore, a polarizing sheet including the quantum rod having polarization characteristics and the same It is characterized by providing a liquid crystal display device.

4 is a perspective view of a polarizing sheet having a quantum rod according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view of a portion of FIG. 4 taken along line III-III.

As illustrated, a polarizing sheet having a quantum rod according to an embodiment of the present invention is a partition wall interposed between the first and second substrates 162 and 170 made of a transparent material and these two substrates 162 and 170 165 and a quantum rod layer 168 provided with a plurality of quantum rods 156 arranged in one direction and an encapsulant (not shown).

The polarizing sheet 160 according to the present invention will be described in more detail.

Transparent first substrate 162, for example, a glass substrate or a flexible plastic substrate or film having a first width (w1) and a first height (h1) on a substrate or a plurality of extending in one direction The partition wall 165 is formed with a constant first separation interval dis1.

In addition, a plurality of quantum rods 156 are provided in the separation region between the partition walls 165 to form the quantum rod layer 168.

At this time, the plurality of quantum rods 156 have a central size, that is, a shortened length csl of the quantum rod 156 (when the quantum rod 156 is made of only a core, it becomes a shortened length of the core, and consists of a core and a shell. In this case, the shortening length of the shell including the core) is preferably 3 nm to 100 nm.

In addition, the quantum rod layer 168 may be made of the quantum rod 156 alone, or a quantum rod 156 and a binder resin (not shown) may be mixed and cured.

At this time, the binder resin (not shown) is preferably a polymer (Polyester) containing an amine (amine) and hydroxy (Hydroxy) group as a polymer having transparency. This is because the binder resin is made of the above-described material because it does not react with the quantum rod 156 and does not affect the fluorescence and alignment characteristics of the quantum rod 156.

On the other hand, the first separation distance (dis1), which is the separation distance between the partition walls 165, is preferably 5 to 50 times the shortening length (csl) of the quantum rod 156, the first of the partition wall 165 The width w1 is preferably 1/100 to 1 times the first separation distance dis.

In addition, the first height h1 of the partition wall 165 is larger than the minor axis length csl of the quantum rod 156, and is preferably 5 nm to 100 μm.

As described above, that is, the first width (csl/100 ≤ w1 ≤ cls) and the first separation distance (5*csl ≤ dis1 ≤ 50*csl) and the first height (5nm ≤ h1 ≤ 100㎛, but h1 Forming the partition wall 165 having csl) on the first substrate 162 has a long axis evenly arranged in one direction in a plurality of quantum rods 156 constituting the quantum rod layer 168. To make it possible.

In addition, a second substrate 170 made of a transparent material, that is, a substrate made of a glass material or a plastic material substrate or film having flexible characteristics is provided on the partition wall 165 and the quantum rod layer 168, and the first And between the second substrate (162, 170) is provided with an encapsulant 173 along the border of the first and second substrates (162, 170).

Meanwhile, in the polarizing sheet 160 according to the embodiment of the present invention having the above-described configuration, the quantum rod layer 168 may be variously configured.

6A to 6D are views illustrating various configurations of the quantum rod layer in the polarizing sheet according to the embodiment of the present invention.

The quantum rod layer 168 defines a space between two partition walls 165 adjacent to each other as a quantum line, as shown in FIG. 6A, in front of the first and second substrates 162 and 170. Across each of the quantum lines Ln1, Ln2, and Ln3, a quantum rod 156 having the same (or within a certain range) long axis length L to fluoresce light of the same wavelength band may be formed. As illustrated, quantum rods 156 having different long axis lengths L1, L2, and L3 may be formed to fluoresce light of different wavelengths for each quantum line Ln1, Ln2, Ln3, or FIG. 6C to 6D, the quantum rods 156 having different long axis lengths L1, L2, and L3 may be mixed to form respective quantum lines Ln1, Ln2, and Ln3.

As illustrated in FIG. 6A, without quantum line division, that is, when each of the quantum lines Ln1, Ln2, and Ln3 is provided with a quantum rod 156 having the same (or within a certain range) long axis length L, The light finally emitted through the polarizing sheet 160 exhibits a single color having a range of wavelengths.

In this case, the single color may be any one of red, green, and blue, or may be white, and may be cyan, yellow, and magenta other than red, green, blue, and white.

The polarizing sheet 160 that fluoresces such a single color is provided in a mono liquid crystal display device, for example, so that a background color of an image realized through the liquid crystal display device can be achieved.

In addition, when quantum rods 156a, 156b, and 156c having different long axis lengths are formed for each quantum line (Ln1, Ln2, Ln3), for example, as shown in FIG. 6B, three quantum lines adjacent to each other ( Ln1, Ln2, Ln3) as a group, and each of the three different quantum lines (Ln1, Ln2, Ln3) in each group has a first quantum line (Ln) to emit red, green, and blue fluorescent light. ) Is to be provided with a quantum rod (156a) having a relatively longest long axis (L1), the third quantum line (Ln3) is provided with a quantum rod (156c) having the smallest long axis (L3), The second quantum line (Ln2) is smaller than the long axis length (L1) of the quantum rod (156a) provided in the first quantum line Ln1 and the long axis length of the quantum rod (156c) provided in the third quantum line (Ln3) ( It may also be provided with a quantum rod (156b) having a longer major axis length (L2) than L3).

When the quantum rods 156a, 156b, and 156c having different long axis lengths are provided for each of the quantum lines Ln1, Ln2, and Ln3 to form red, green, and blue colors for each group, through the polarizing sheet 160, Finally, white light is generated.

On the other hand, when the polarizing sheet 160 is to fluoresce the white light, as shown in Figure 6c, each of the quantum rod layer 168 is a long axis length (L1, L2, L3) of the quantum rod 156 Each of the above quantum lines Ln1, Ln2, Ln3 in the form of a mixture of quantum rods 156a, 156b, and 156c having long axis lengths (L1, L2, L3) of three sizes that fluoresce red, green, and blue without distinction ) May be formed.

This is because, in the case of white light, it may be implemented by a subtraction method of red, green, or blue, or even when light of all wavelengths is mixed.

Further, as illustrated in FIG. 6D, the quantum rod layer 168 has long lengths L1, L2, and L3 of two different sizes for three quantum lines Ln1, Ln2, and Ln3 in each group. By having the quantum rods (156a, 156b, 156c) having a mixed form, for example, the first quantum line (Ln1) in each group has two sizes with long axis lengths (L1, L2) emitting red and green, respectively. The quantum rods 156a and 156b are provided, and the second quantum line Ln2 is provided with two sizes of quantum rods 156a and 156c having long and long lengths L1 and L3 emitting red and blue colors, respectively. In addition, the third quantum line Ln3 may be provided with two sizes of quantum rods 156b and 156c having long-axis lengths L2 and L3 that emit green and blue light, respectively, so that white may be fluoresced.

When the light of the first wavelength band is incident from a light source such as a backlight unit (not shown), the polarization sheet 160 according to an embodiment of the present invention having the above-described configuration, the quantum rod layer 168 in the polarization sheet 160 By receiving the light of the first wavelength band by the role of fluoresces the light of the second wavelength band different from the first wavelength band, at the same time by the quantum rod 156 aligned in one direction in the quantum rod layer 168 Light having a second wavelength band and fluorescent light is given polarization characteristics in one direction.

Therefore, the light emitted from the polarizing sheet 160 becomes light in a second wavelength band having a light level similar to the amount of light incident on the polarizing sheet 160, so that a large amount of light is lost due to the light disappearing from the inside. It has excellent luminance characteristics compared to a general polarizing plate (150 in FIG. 2) where (in fact, 50% or more of the light incident is lost).

Therefore, the liquid crystal display device having the polarizing sheet 160 according to the present invention having such a configuration as one polarizing plate has an effect of improving luminance characteristics compared to a liquid crystal display device having only a conventional general polarizing plate.

7 is a schematic cross-sectional view of a portion of a display area of a liquid crystal display having a polarizing sheet having a quantum rod according to an embodiment of the present invention.

A liquid crystal display device 100 having a polarizing sheet 160 having a quantum rod 156 according to an embodiment of the present invention, a liquid crystal panel 110 and a thin film transistor that is a switching element of the liquid crystal panel 110 The polarization sheet 160 having the quantum rod 156 provided on the outer surface of the array substrate 112 provided with (Tr) and the outer surface of the opposite substrate 122 provided with the color filter layer 126 are provided. It comprises a polarizing plate 180, and a backlight unit (BLU) provided on the outer surface of the polarizing sheet 160.

Although not illustrated, the liquid crystal display device 100 further includes a support main, a cover bottom, and a top cover for modularizing the liquid crystal panel 110 and the backlight unit (BLU).

Each of these components will be described in detail.

First, the liquid crystal panel 110 is a part that plays a key role in expressing an image, and is composed of an array substrate 112 and a counter substrate 122 adhered to each other with a liquid crystal layer (not shown) interposed therebetween. have.

At this time, a plurality of gate wires (not shown) and data wires (not shown) cross each other on the inner surface of the array substrate 112, commonly referred to as a lower substrate, and are defined as regions captured by these two wires (not shown). A plurality of pixel areas P are provided, and each of the pixel areas P is adjacent to a portion at which the gate line (not shown) and the data line (not shown) intersect and connects these two lines (not shown). A thin film transistor Tr is provided, and a pixel electrode 116 connected to one electrode of the thin film transistor Tr is provided in each pixel area (not shown).

In the drawing, although the pixel electrode 116 is provided in the form of a plate in each pixel area P as an example, the pixel electrode 116 is formed in a plurality of bars in each pixel area P. A spaced apart form may be formed, or a pixel electrode in the form of a plate may be formed and a plurality of bar-shaped openings may be provided therein.

In addition, when the pixel electrode forms a plurality of bars, a common electrode having the same shape alternately with the plurality of pixel electrodes in the bar form is further provided, and the pixel electrode has a plurality of openings. When possible, a common electrode in the form of a plate may be further provided by overlapping the pixel electrode with an insulating layer.

Meanwhile, a color filter layer 126 including red, green, and blue color filter patterns 126a, 126b, and 126c that are sequentially repeated corresponding to each pixel region P on the inner surface of the counter substrate 122 called an upper substrate. And each of these color filter patterns 126a, 126b, and 126c, and displays non-display elements such as gate wiring (not shown) and data wiring (not shown) and thin film transistors (Tr) provided on the array substrate 112. A screening black matrix 124 is provided.

At this time, when the common electrode in the form of a bar or a plate is not provided in the array substrate 112, a common electrode 128 transparent to the entire surface of the display area is further provided on the inner surface of the counter substrate 122. do.

In the drawing, as an example, only the pixel electrode 116 in the form of a plate is provided in each pixel area P on the array substrate 112, and the common electrode 128 is formed on the inner surface of the counter substrate 122. Did.

Meanwhile, in the liquid crystal panel 110 having the above-described configuration, when the liquid crystal display device 100 implements a mono color, the color filter layer 126 may be omitted.

In addition, although not shown in the drawing, upper and lower alignment layers (not shown) that determine the initial molecular alignment direction of the liquid crystal at the boundary between the array substrate 112 of the liquid crystal panel 110 and the counter substrate 122 and the liquid crystal layer 130. When interposed), a seal pattern (not shown) is formed along the edges of the both substrates 112 and 122 to prevent leakage of the liquid crystal layer 130 filled therebetween.

In addition, a printed circuit board (not shown) is mounted through a connecting member (not shown) such as a flexible circuit board (not shown) along at least one edge of the liquid crystal panel 110 having the above-described configuration. have.

In the liquid crystal panel 110 having the above-described structure, signals for on/off of the thin film transistor (not shown) are sequentially scanned and applied to the gate wiring (not shown), and the data wiring When an image signal is transmitted to the pixel electrode 116 of the pixel region P in which the image signal is selected through (not shown), an electric field (vertical electric field or transverse electric field) generated between the pixel electrode 116 and the common electrode 128 is generated. The liquid crystal molecules in the liquid crystal layer 130 interposed between the array substrate 112 and the counter substrate 122 are driven by an electric field), and various images can be displayed due to the change in light transmittance.

On the other hand, as one of the most characteristic configuration in the liquid crystal display device 100 according to the present invention, when the light of a specific wavelength band is incident on the outer surface of the array substrate 112 of the liquid crystal panel 110, it is polarized in one direction. A polarizing sheet 160 including a quantum rod 156, which is characterized by fluorescence of a specific color, is provided, and on the outer surface of the counter substrate 122, a polymer polarizing medium layer made of general polyvinyl alcohol (PVA) A polarizing plate 180 (not shown) is provided.

At this time, although different depending on the liquid crystal driving characteristics of the liquid crystal display device 100, the polarization direction of the polarizing sheet 160 and the polarizing plate 180 is characterized in that they are arranged to form a perpendicular or parallel state to each other. That is, the polarizing sheet 160 and the polarizing plate 180 are disposed such that the longitudinal direction of the partition wall 165 provided in the polarizing sheet 160 and the polarization axis of the polarizing plate 180 are parallel or perpendicular to each other. It is characteristic.

On the other hand, the liquid crystal display device 100 according to an embodiment of the present invention has a specific wavelength band on the outer surface of the polarizing sheet 160, more precisely, the back surface thereof so that the difference in transmittance represented by the liquid crystal panel 110 is expressed to the outside. A backlight unit (BLU) for supplying light to the liquid crystal panel is provided.

The backlight unit (BLU) comprises a light source 229a, a reflector 225, a light guide plate 223 mounted on the reflector 225, and a plurality of optical sheets 221 positioned thereon. .

In addition, although not shown in the drawings, the liquid crystal panel 110 and the backlight unit (BLU) are seated on a support main (not shown) having a rectangular frame shape, or formed in a circumferential state, and the support main (not shown). The liquid crystal display device 100 is constituted by the upper and lower sides of the liquid crystal panel 110 and the cover bottom (not shown) and the top cover (not shown) respectively covering the top and bottom edges, respectively.

On the other hand, among the components constituting the backlight unit (BLU), the light source 229 is among a fluorescent lamp or a light emit diode (LED) 229a including a cold cathode fluorescent lamp (CCFL) and an external electrode fluorescent lamp (EEFL). It can be made of a selected one, the figure shows that it is made of LED (229a) as an example.

The light source 229 is located on one side of the light guide plate 223 so as to face the light incident portion of the light guide plate 223, and when the light source 229 is a fluorescent lamp, the outside is guided by a lamp guide (not shown). When the light source 229 is an LED, an LED driving substrate 229b on which the plurality of LED chips 229a are mounted is provided to drive the plurality of LED chips 229a.

Meanwhile, the light guide plate 223 allows the light incident from the light source 229 to propagate therein by multiple total reflections and spreads evenly into the light guide plate 223, thereby providing a surface light source to the liquid crystal panel 110. to provide.

In this case, the light guide plate 223 may include a pattern (not shown) having a specific shape on the back surface to supply a uniform surface light source to the liquid crystal panel 110.

Here, the pattern (not shown) of a particular shape is various, such as an elliptical pattern, a polygonal pattern, a hologram pattern, etc. in order to guide light incident into the light guide plate 223. It can take the form.

In addition, the reflection plate 225 is located on the rear surface of the light guide plate 223, and reflects light passing through the rear surface of the light guide plate 223 toward the liquid crystal panel 110 to improve the luminance of the light.

In addition, the plurality of optical sheets 221 provided on the light guide plate 223 includes a diffusion sheet 227 and at least one light collecting sheet 228.

On the other hand, the backlight unit (BLU) having such a configuration, the light source 229 is provided on the side of the light guide plate 223, and has become an edge-type type in which a surface light source is incident on the liquid crystal panel 110 by the light guide plate 223. Although it is shown as an example, the backlight unit BLU may have a direct type.

In the case of a direct type backlight unit (not shown), although not shown in the drawing, a plurality of fluorescent lamps are disposed at regular intervals on top of the reflector 225, or a driving substrate for LEDs in which a plurality of LEDs are arranged is provided. , A diffusing plate (not shown) is provided in place of the light guide plate 223 as an upper portion thereof, and a plurality of optical sheets 221 are provided above the diffusion plate (not shown).

The most characteristic feature of the liquid crystal display device 100 according to an embodiment of the present invention having such a configuration is that the long axis between the liquid crystal panel 110 and the backlight unit (BLU) is arranged in one direction, more precisely a partition wall ( 165) is provided with a polarizing sheet 160 having a plurality of quantum rods 156 arranged in the longitudinal direction.

At this time, that the long axes of the plurality of quantum rods 156 are arranged in one direction coincides with the transmission axis of the polarizing plate 180 provided on the outer surface of the counter substrate 122 (or the polarizing axis of the polarizing plate 180) Or perpendicular to (or parallel to the polarization axis of the polarizing plate 180).

The arrangement of the quantum rods 156 in one direction becomes a longitudinal direction of the partition walls 165 provided in the polarizing sheet 160, and it is later to allow the long axes of the quantum rods 156 to be arranged in one direction. It will be described in detail through the manufacturing method of (160).

On the other hand, the liquid crystal display device 100 according to an embodiment of the present invention having the above-described configuration is provided with a polymer polarizing medium layer (56 of FIG. 2) made of polyvinyl alcohol (PVA) serving to polarize incident light. Instead of the normal polarizing plate (50 in FIG. 2) that generates a large light loss of light (more than 50% of the amount of light incident therein is lost inside), it is incident by the role of its own fluorescence property A polarization sheet 160 having a quantum rod 156 aligned in one direction in which light loss is hardly generated by preserving the amount of light to be stored is provided, so that the light generated from the backlight unit (BLU) is polarized sheet 160 ), the light loss is suppressed, thereby improving the luminance characteristics compared to a conventional liquid crystal display (1 in FIG. 1) equipped with two general polarizing plates (50 and 52 in FIG. 1 ).

Furthermore, when the liquid crystal display device 100 according to an embodiment of the present invention has the same level of brightness characteristics as that of a conventional general liquid crystal display device (1 in FIG. 1), the brightness characteristics of the backlight unit BLU itself are conventional. Since it can be set to a low level, there is an advantage in that power consumed for driving the backlight unit (BLU) is reduced.

Hereinafter, a method of manufacturing a polarizing sheet according to an embodiment of the present invention will be described.

8A to 8E are cross-sectional views of manufacturing steps of a polarizing sheet according to an embodiment of the present invention.

First, as illustrated in FIG. 8A, a first substrate 162 having a transparent and insulating property, for example, a glass substrate or an organic material having a photosensitive property on a plastic substrate or film having flexible properties For example, forming a photosensitive layer 163 by coating a photoacrylic or photoresist, or a material having no photosensitive properties prior to coating of an organic material having the photosensitive properties, for example, silicon oxide (SiO ₂ ), silicon nitride ( SiNx), polyimide is deposited or photo-formed to form a first material layer (not shown), and then the photosensitive layer 163 is formed on the first material layer (not shown).

In the drawing, for example, a photosensitive layer 163 is formed without a first material layer (not shown).

Thereafter, an exposure mask 190 having a light transmission area TA and a blocking area BA is positioned on the photosensitive layer 163, and UV is applied to the photosensitive layer 163 using the exposure mask 190. An exposure step of selectively irradiating light is performed.

Next, as shown in FIG. 8B, a process of selectively exposing the photosensitive layer (163 in FIG. 8A) irradiated with UV light to a developer is performed to selectively select only the exposed or unexposed portion of the UV light. By removing as a first to form a partition wall 165 having a first width (w1) and a first height (h1) on the first substrate 162 and having a first separation interval (dis1) and disposed constant in one direction .

On the other hand, when the photosensitive layer (163 in FIG. 8A) is formed on the first material layer (not shown), by performing the above-described development process, the photosensitive material having a constant width and spacing between the first material layer (not shown) After forming a pattern (not shown), the etching process of exposing the first material layer (not shown) to the etchant to the first material layer (not shown) exposed outside the photosensitive pattern (not shown) is further performed, and then the strip process is performed. By removing the photosensitive pattern (not shown), the first substrate 162 has the same shape as the partition wall 165 made of the photosensitive material, that is, has a first width w1 and a first height h1 and extends in one direction. It can form a partition wall 165 made of a non-photosensitive material having a first separation interval (dis1) in the form.

At this time, the first separation interval (dis1) is 5 to 50 times the shortened length (csl of FIG. 8e) of the quantum rod (156 of FIG. 8e) forming the quantum rod layer (168 of FIG. 8e) to be formed later, The first width w1 is 1/100 to 1 times the first separation interval dis1, and the first height h1 is the shortened length of the quantum rod (156 in FIG. 8E) (csl in FIG. 8E). It is characterized in that the partition wall 165 is formed to be larger than 5 nm to 100 μm.

Next, as illustrated in FIG. 8C, the first substrate 162 on which the partition wall 165 is formed is positioned on a stage of a bar coating device (not shown) or a spin coating device (not shown). After, the quantum rod solution for the separation area between the partition walls 165 of the first substrate 162 is performed by performing a bar coating that progresses in the longitudinal direction of the partition walls 165 or by performing spin coating. Applying to form a liquid quantum rod layer (167).

The quantum rod solution is characterized by consisting of a quantum rod 156 and a solvent or a quantum rod 156 and a binder resin and a solvent.

At this time, in the quantum rod solution, the quantum rod 156 may have the same long axis length, or two or more of them having different long axis lengths may be mixed, and the binder resin is an amine as a polymer having transparency. It is preferably made of a polyester (Polyester) containing a hydroxy group (Hydroxy) group.

In addition, one component constituting the quantum rod solution is a solvent that does not affect the quantum rod 156, for example, one of Toluene, Tetralin, Diisopropylbenzene, Benzyl alcohol, Isopar G, Octadecene.

At this time, since the configuration of the quantum rod 156 itself has been described in detail with reference to the drawings, the configuration of the quantum rod 156 itself is omitted.

Meanwhile, the quantum rod solution having the above-described configuration is coated on the entire surface of the first substrate 162 through the bar coating device (not shown) or a spin coating device (not shown), so that the liquid quantum rod layer ( In the case of forming 167, the polarizing sheet 160 according to the present invention has specific conditions, that is, has a first width w1 and a first height h1, extends in one direction, and has a first separation interval dis1. Since a plurality of partition walls 165 are provided, the quantum rods 156 provided in each quantum line by the partition walls 165 are self-aligned so that their long axes are arranged in the longitudinal direction of the partition walls 165. do.

The liquid quantum rod layer 167 coated on the first substrate 162 by the bar coating device (not shown) or the spin coating device (not shown) maintains a liquid state, and this liquid Inside the quantum rod layer 167 in the state, the quantum rod 156 itself has a degree of freedom of arrangement.

However, the degree of freedom of the arrangement of the quantum rods 156 is limited by the partition walls 165 formed in one direction. In particular, the quantum rods 156 adjacent to the partition walls 165 are partitioned by the partition walls 165. The long axis is arranged in the longitudinal direction of 165, and the peripheral axis of the quantum rod 156 is also affected by the influence of the quantum rod 156 in which the longitudinal direction of the partition wall 165 coincides with the long axis. It is aligned to match the longitudinal direction of the partition wall (165).

Therefore, the quantum rod layer 167 in the liquid phase formed by being coated by a bar coating device (not shown) or a spin coating device (not shown) in the separation area between the partition walls 165 is formed of the quantum rod 156 itself. After a predetermined time has elapsed due to the alignment characteristics, all of the long axes of the first substrate 162 are uniformly arranged in the longitudinal direction of the partition wall 165.

Meanwhile, the coating of the quantum rod solution may be performed by using an inkjet device (not shown) or a nozzle coating device (not shown) in addition to the above-described bar coating device (not shown) or spin coating device (not shown). .

In particular, the above-described bar (bar) coating to form the quantum rod layer 167, characterized in that the quantum rod 156 having a different long axis length for each quantum line for the separation area between the partition wall 165 It is not possible through a device (not shown) and a spin coating device (not shown).

Therefore, the inkjet device (not shown) includes a quantum rod solution containing a quantum rod 156 having a different major axis length through an inkjet device (not shown) or a nozzle coating device (not shown) that can selectively coat each quantum line. ) Of the head (not shown) or the nozzle (not shown) of the nozzle coating device (not shown) moves along the longitudinal direction of the partition wall 165 so that the quantum rod solution is sprayed and selectively coated for each quantum line. Different long axes that fluoresce red, green, and blue (or red and green, red and blue, green and blue) on the first, second and third quantum lines Ln1, Ln2, and Ln3, respectively, in the form shown in 6c or 6d. The lengths L1, L2, and L3 may be made to form the quantum rod layers 167 in a liquid form in which the quantum rods 156a, 156b, and 156c are respectively provided.

When the quantum rod solution including the quantum rod 156 having a different long axis length for each quantum line (Ln1, Ln2, Ln3) is coated through such an ink jet device (not shown) or nozzle coating device (not shown) Also, by the role of the partition wall 165, all of the quantum rods 156a, 156b, and 156c in each of the quantum lines Ln1, Ln2, and Ln3 are arranged with long axes arranged in the same direction as the longitudinal direction of the partition wall 165. Will be achieved.

Next, as shown in FIG. 8D, after a predetermined time has elapsed so that the quantum rod 156 is disposed in the longitudinal direction of the partition 165 inside the liquid quantum rod layer (167 in FIG. 8C). In order to remove the solvent in the quantum rod layer (167 in FIG. 8C), a heat treatment process is performed.

After the solvent is completely removed by the heat treatment process, only the quantum rod 156 remains between the partitions 165 on the first substrate 162, and the quantum rod layer 168 from which the solvent is removed is cured. It becomes a state of being.

At this time, each quantum rod 156 positioned in the cured quantum rod layer 168 is in a solid state rather than a liquid state. Therefore, in this case, the degree of freedom of movement of the quantum rod 156 itself becomes almost zero, thereby maintaining a state in which a long axis is disposed in the longitudinal direction of the partition wall 165.

When a binder resin (not shown) is further included in the liquid quantum rod layer 168, the binder resin (not shown) is also cured by the heat treatment process. In this case, each of the quantum rods 156 is surrounded by it. The binder resin (not shown) is wrapped to form a more firmly cured state. At this time, it will be apparent that the quantum rod 156 wrapped in the cured binder resin (not shown) also forms a form aligned in the longitudinal direction of the partition wall 165.

FIG. 9 shows a long axis of a quantum rod in a quantum rod layer when a quantum rod layer is formed using a bar coating device, respectively, on a substrate having a partition formed in accordance with the present invention and a substrate having no partition walls as a comparative example. It is a view showing an alignment state in the direction, and FIG. 10 shows a case where a quantum rod layer is formed using a spin coating device on a substrate without a partition wall as a comparative example and a substrate with a partition wall according to the present invention. It is a figure showing the alignment state of the long axis direction of the quantum rod in the rod layer.

First, in the case of a bar coating, the quantum rod solution has a long axis of the quantum rod 156 to some extent in the direction of progression of the bar in both the present invention and the comparative example, since the flow occurs in the direction of progression of the bar. You can see that it is located.

However, in the case of the comparative example, the flow direction of the quantum rod solution changes as it deviates from the outside of the center portion where the bar coating is made, and thus the longer axis direction of the quantum rod 156 is turned toward the side than the central portion of the substrate. You can see that you lose.

On the other hand, in the case of the present invention, the partition wall 165 is provided with a first separation distance (dis1), the progress of the bar (bar) of the bar coating device (not shown) is the partition wall 165 Is becoming the longitudinal direction of Therefore, the flow of the quantum rod solution is controlled in units of the first separation distance (dis1) where each partition wall 165 is disposed, and the flow within the separation area of each partition wall 165 is only in the longitudinal direction of the partition wall 165. Since it is limited, it can be seen that the same occurs with respect to the central portion of the substrate 162 or the side edge portion of the substrate 162.

Furthermore, since the quantum rod 156 positioned in the periphery of the partition wall 165 is naturally aligned in the longitudinal direction of the partition wall 165, its long axis is consistent with respect to the front surface of the substrate 162, the partition wall 165 ), the quantum rod layer 167 in a liquid state aligned in the longitudinal direction is formed.

On the other hand, referring to Figure 10, in the case of spin coating, the quantum rod solution is spread out in a concentric shape by the rotation of the substrate, the flow is made in the range of 0 to 360 degrees depending on the position in the substrate.

Therefore, in the case of the comparative example, it can be seen that, by spin coating, the long axis of the quantum rod 156 is randomly disposed over 0 to 360 degrees, so that a sheet having polarization characteristics cannot be manufactured.

However, in the case of the present invention, although the partition wall 165 extending in one direction on the substrate 162 is disposed with a first separation distance dis1, although the quantum rod solution spreads in a range of 0 to 360 degrees, the above The flow of the quantum rod solution itself is limited by the partition wall 165.

That is, even if the flow of the quantum rod solution perpendicular to the longitudinal direction of the partition wall 165 occurs in the separation area between the partition walls 165 adjacent to each other, the flow of the flow is further blocked by the partition wall 165, thereby preventing the partition wall ( The flow in the vertical direction of 165) is suppressed, and a ditch is formed by two adjacent partitions 165, so in the separation area between each partition 165, the flow direction of the quantum rod solution is finally the partition wall 165 ) In the longitudinal direction.

Therefore, even if the spin coating is performed, the quantum rod layer 167 in a liquid state in which the long axis is constantly aligned in the longitudinal direction of the partition 165 can be formed by the manufacturing method according to the present invention.

FIG. 11 is a graph measuring polarization characteristics by irradiating light of a specific wavelength band in a state in which a quantum rod layer is formed through a bar coating device on a substrate having a partition wall formed according to the present invention, wherein the quantum rod layer is formed When UV light is irradiated from the rear surface of the substrate, and the transmission axis of a general polarizing plate is arranged parallel to the alignment direction (longitudinal direction of the bulkhead) of the quantum rod (indicated by PL(∥)) and vertical (PL (⊥)) is the result of measuring the luminance when placed.

12 is a graph measuring polarization characteristics by irradiating light of a specific wavelength band to a substrate according to a comparative example in which a quantum rod layer is formed through a bar coating without a partition wall, and the transmission axis of the polarizing plate is horizontal (PL(∥)w/o wall) (based on the direction of progress of the bar of the bar coating device) and vertical (direction perpendicular to the direction of progress of the bar coating), each of which is irradiated with light of a specific wavelength to measure polarization characteristics. One result.

In this case, the substrate according to the present invention is formed with a partition wall having a first height of 50 nm, a first width of 2.5 μm, and a first spacing of 3.5 μm, and the quantum rod is used for the substrate according to the embodiments and comparative examples of the present invention. Therefore, the long axis length of 46nm and the short axis length of 5nm were used, and the UV light was examined to have a center wavelength of 628nm.

Referring to FIG. 11, a substrate according to an embodiment of the present invention in which a quantum rod layer is formed through a manufacturing method including a bar coating and having a partition wall so that a long axis of the quantum rod is arranged in one direction is transmitted from the transmission axis of the polarizer and the It can be seen that the final luminance for UV light having a center wavelength of 628 nm is about 5.9 [au] when placed in parallel with the alignment direction (longitudinal direction of the bulkhead) of the long axis of the quantum rod (indicated by PL(∥)).

In addition, when the substrate according to the embodiment of the present invention is arranged (indicated by PL(⊥)) to be perpendicular to the alignment direction (longitudinal direction of the partition wall) of the transmission axis of the polarizing plate and the long axis of the quantum rod, the center wavelength is 628 nm. It can be seen that the UV light has a luminance size of 2.4 [au].

Therefore, in the manufacturing method according to the present invention, the polarization degree of the substrate on which the quantum rod layer is formed by the bar coating (the luminance of light perpendicular to the transmission axis of the polarizing plate, that is, the luminance of light horizontal to the transmission axis of the polarizing plate, that is, ((PL (∥)/PL(⊥)) was found to be about 2.45.

In the case of the comparative example, referring to FIG. 12, when the substrate was placed parallel to the polarization axis of the polarizing plate (displayed as PL(∥)w/o wall), a luminance characteristic of 5.8[au] was obtained, which is similar to the present invention. Is becoming

However, it was found that when the polarization plate was vertically arranged (the direction perpendicular to the direction of progression of the bar is perpendicular to the polarization axis of the polarizing plate), a degree of 4.6 [a.u.] was shown, and finally the polarization degree was about 1.26.

Therefore, the substrate having the quantum rod layer through the partition wall and bar coating according to the embodiment of the present invention was found that the quantum rod in the quantum rod layer was well aligned in one direction, that is, the longitudinal direction of the partition wall, the quantum rod layer without the partition wall It was found that the polarization property of the substrate according to the comparative example formed is about twice as good.

On the other hand, even in the case of forming a partition wall according to the present invention and forming a quantum rod layer through a spin coating device, as a result of measuring the polarization degree as applied to the substrate forming the quantum rod layer through a coating device as described above, the substrate It was found that the quantum rod had a luminance magnitude of 5.9 [au] when arranged parallel to the transmission axis of the polarizer in the direction of long axis alignment of the quantum rod, and 1.9 [au] when arranged vertically, and thus had a polarization degree of about 3.1. .

On the other hand, as a comparative example, in the case of a substrate having a quantum rod layer formed by spin coating without a partition, there is no alignment standard for the quantum rod, and after fixing the substrate, the polarizer is rotated and measured. As a result of showing the ratio of the luminance of light, it was found that it was about 1.8.

Accordingly, it was found that the substrate forming the barrier ribs according to the present invention and the quantum rod layer through the spin coating device was also well aligned with the quantum rods in the quantum rod layer in one direction, that is, in the longitudinal direction of the barrier ribs, by spin coating without the barrier ribs. It was found that the polarization property is superior to about 1.7 times that of the comparative example in which the quantum rod layer is formed.

On the other hand, using the inkjet device and the nozzle coating device according to the present invention to form a quantum rod layer having a quantum rod having a different long axis length for each quantum line also occurs in the process of coating through the coating device as described above By implementing the same effect, it is possible to form a quantum rod layer having a configuration of a quantum rod whose long axes are arranged in the longitudinal direction of the partition wall.

On the other hand, returning to the method of manufacturing a polarizing sheet according to an embodiment of the present invention, after forming the cured quantum rod layer as described above, as shown in Figure 8e, the cured quantum rod layer 168 is provided After positioning the second substrate 170 of a transparent material so as to face the first substrate 162, the encapsulant 173 is disposed along the edge of the first substrate 162 or the second substrate 170. By bonding the first and second substrates 162 and 170 in a formed state, a polarizing sheet 160 according to an embodiment of the present invention is completed.

At this time, the encapsulant 173 may be made of a sealant as an example of a material having an adhesive property, and after curing by being cured when exposed to UV light or heat, the first and second substrates 162 and 170 It is characterized by playing a role in keeping this bonded state.

The present invention is not limited to the above-described embodiments, and can be implemented by variously changing within the limits without departing from the gist of the present invention.

156: Quantum Road
160: polarizing sheet
162: first substrate
165: bulkhead
168: Quantum Road layer
170: second substrate
csl: shortened quantum load
dis1: the first separation interval
h1: first height
w1: 1st width

Claims (22)

A liquid crystal panel including an array substrate, a counter substrate, and a liquid crystal layer interposed between the array substrate and the counter substrate;
A polarizing plate attached to an outer surface of the opposite substrate of the liquid crystal panel;
Located on the outer surface of the array substrate of the liquid crystal panel, and having a first width and a first height and a first separation distance on a transparent first substrate and extending in one direction, a plurality of partition walls formed, and a separation area between the partition walls It is formed corresponding to the quantum rod layer having a plurality of quantum rods characterized in that the long axis is aligned in the longitudinal direction of the partition wall, and includes a transparent second substrate provided to cover the partition wall and the quantum rod layer, A polarizing sheet arranged such that a polarization axis of the polarizing plate and a longitudinal direction of the partition wall are parallel or vertical;
A backlight unit provided under the polarizing sheet
It includes,
The backlight unit includes a light source, a light guide plate to which light is incident from the light source, an optical sheet positioned between the light guide plate and the polarizing sheet, and a reflector positioned below the light guide plate,
All of the light passing through the polarizing sheet passes through the liquid crystal panel and is incident on the polarizing plate.
According to claim 1,
The shortened length of the quantum rod is 3nm to 100nm, characterized in that the liquid crystal display device.
According to claim 1,
The first separation interval is 5 to 50 times the shortening length of the quantum rod,
The first width is 1/100 to 1 times the first separation interval,
The first height is greater than the short axis length of the quantum rod and is 5nm to 100㎛ liquid crystal display device.
According to claim 1,
The quantum rod layer is a liquid crystal display device characterized in that it further comprises a binder resin.
The method of claim 4,
The binder resin is a liquid crystal display device characterized in that it is a polymer having transparency and includes an amine group and a hydroxyl group (Hydroxy).
According to claim 1,
The quantum rod is made of only the core,
Or a core and a shell surrounding the core,
The quantum rod has a form having a short axis and a long axis, and the ratio of the short axis to the long axis is 1:1.1 to 1:30.
The method of claim 6,
The core is a liquid crystal display device characterized in that it consists of a semiconductor, alloy or a mixed material of the Ⅱ-Ⅵ, Ⅲ-V, Ⅲ-Ⅵ, Ⅵ-Ⅳ, Ⅳ group on the periodic table.
The method of claim 7,
When the core of the quantum rod is made of a II-VI group, CdSe, CdS, CdTe, ZnO, ZnSe, ZnS, ZnTe, HgSe, HgTe, CdZnSe, CdSeTe, ZnCdSe, or a mixture of two or more substances Is made of,
In the case of the III-V group, InP, InN, GaN, InSb, InAsP, InGaAs, GaAs, GaP, GaSb, AlP, AlN, AlAs, AlSb, or a mixture of two or more materials,
In case of group III-IV-VI, Tl ₂ SnTe ₅ or in case of group VI-IV, PbSe, PbTe, PbS, PbSnTe A liquid crystal display device, characterized in that it is made of any one of or a mixture of two or more substances.
According to claim 1,
The quantum rod layer is a liquid crystal display device characterized in that when the light of a specific wavelength band is incident on the quantum rod layer to fluoresce monochromatic light.
The method of claim 9,
The quantum rod layer is a liquid crystal display device characterized in that all of the quantum rod having a long axis of the same size.
According to claim 1,
The quantum rod layer is a liquid crystal display device characterized in that it emits white light when light of a specific wavelength is incident on the quantum rod layer.
The method of claim 11,
The quantum rod layer is a liquid crystal display device characterized in that the quantum rod having a long axis of a different size for each spaced area located between each partition wall is formed by mixing.
The method of claim 11,
When three spaced areas adjacent to each other are defined as one group, and three spaced areas within each group are sequentially defined as first, second, and third quantum lines,
The first quantum line is provided with a quantum rod layer having a quantum rod having a long axis length to fluoresce red, and the second quantum line is provided with a quantum rod layer having a quantum rod having a long axis length to fluorescence green. In the third quantum line, a quantum rod layer having a quantum rod having a long axis length that fluoresces blue is provided, or
Alternatively, the first quantum line is provided with a quantum rod layer having quantum rods having first and second long-axis lengths that fluoresce red and green, and the first and first fluorescences of red and blue are provided on the second quantum line. A quantum rod layer having a quantum rod having a long axis length of 3 is provided, and the third quantum line is provided with a quantum rod layer having a quantum rod having second and third long axis lengths that fluoresce green and blue. Characteristic liquid crystal display.
Providing a liquid crystal panel including an array substrate, a counter substrate, and a liquid crystal layer interposed between the array substrate and the counter substrate;
Attaching a polarizing plate to an outer surface of the opposite substrate of the liquid crystal panel;
Forming a plurality of partition walls located on an outer surface of the array substrate of the liquid crystal panel and having a first width, a first height, and a first separation distance on the transparent first substrate and extending in one direction, between the partition walls Forming a quantum rod layer having a plurality of quantum rods, characterized in that a long axis is aligned in the longitudinal direction of the partition wall in correspondence to the separation region of the, and covering the partition wall and the quantum rod layer to cover a transparent second substrate. After facing each other, including the step of providing a sealing material along the edge of the first or second substrate and bonding the first and second substrates to form a polarizing sheet,
Attaching the polarizing sheet so that the polarization axis of the polarizing plate and the longitudinal direction of the partition are arranged parallel or vertically;
Positioning a backlight unit under the polarizing sheet
It includes,
The backlight unit includes a light source, a light guide plate through which light is incident from the light source, an optical sheet positioned between the light guide plate and the polarizing sheet, and a reflector positioned below the light guide plate,
A method of manufacturing a liquid crystal display device through which all of the light passing through the polarizing sheet passes through the liquid crystal panel and enters the polarizing plate.
The method of claim 14,
Forming a quantum rod layer having a plurality of quantum rods, characterized in that the long axis is aligned in the longitudinal direction of the partition wall corresponding to the separation region between each partition,
A quantum rod in a liquid state by moving the bar in the longitudinal direction of the partition wall and coating the quantum rod solution by using a bar coating device equipped with a quantum rod solution corresponding to the separation region between the partition walls Forming a layer;
Curing the liquid quantum rod layer by heat treatment
Method of manufacturing a liquid crystal display device comprising a.
The method of claim 14,
Forming a quantum rod layer having a plurality of quantum rods, characterized in that the long axis is aligned in the longitudinal direction of the partition wall corresponding to the separation region between each partition,
The head of the inkjet device or the nozzle of the nozzle coating device proceeds along the longitudinal direction of the partition wall using an ink jet device or a nozzle coating device provided with a quantum rod solution corresponding to the separation area between the partition walls. Forming a liquid quantum rod layer by coating the quantum rod solution by causing the rod solution to be sprayed along the longitudinal direction of the partition wall;
Curing the liquid quantum rod layer by heat treatment
Method of manufacturing a liquid crystal display device comprising a.
The method of claim 16,
When three spaced areas adjacent to each other are defined as one group, and three spaced areas within each group are sequentially defined as first, second, and third quantum lines,
A method of manufacturing a liquid crystal display device characterized in that the first, second and third quantum lines are selectively coated with quantum rod solutions having different long axis lengths.
The method of claim 14,
Forming a quantum rod layer having a plurality of quantum rods, characterized in that the long axis is aligned in the longitudinal direction of the partition wall corresponding to the separation region between each partition,
Forming a liquid quantum rod layer by spin coating the quantum rod solution using a spin bar coating apparatus having a quantum rod solution corresponding to the separation region between the partition walls;
Curing the liquid quantum rod layer by heat treatment
Method of manufacturing a liquid crystal display device comprising a.
The method of claim 14,
The step of forming a plurality of barrier ribs having a first width, a first height, and a first separation distance on the transparent first substrate and extending in one direction,
Forming a photosensitive layer having photosensitive properties on the first substrate;
Performing selective exposure on the photosensitive layer;
A method of manufacturing a liquid crystal display device comprising the step of developing the exposed photosensitive layer.
The method of claim 19,
Forming a first material layer on the first substrate prior to forming the photosensitive layer,
Etching the first material layer exposed to the outside of the developed photosensitive layer after the step of developing the exposed photosensitive layer and stripping and removing the photosensitive layer
Method of manufacturing a liquid crystal display device comprising a.

The method of claim 14,
The shortened length of the quantum rod is 3nm to 100nm,
The first separation interval is 5 to 50 times the shortening length of the quantum rod,
The first width is 1/100 to 1 times the first separation interval,
The first height is greater than the short axis length of the quantum rod, and the manufacturing method of the liquid crystal display device, characterized in that 5nm to 100㎛.
According to claim 1,
A plurality of pixel areas are defined on the array substrate,
When defining each spaced area located between the partition walls as a quantum line,
The polarizing sheet is a liquid crystal display device positioned to correspond to at least two quantum lines in each of the pixel areas.

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