KR20110009857A - Liquid crystal display and method of manufacturing a antireflection layer - Google Patents

Abstract

PURPOSE: A manufacturing method of a liquid display device and an anti-reflective layer is provided to locate anti-reflective layer on an LCD panel, thereby reducing the reflectivity of a display screen and increasing the transmittance. CONSTITUTION: Optical thin film layer having different refractive indexes is formed on transparent substrate of anti-reflective layer as at least one layer. The anti-reflective layer includes a black dye type in some layer among optical thin film layers of at least one layer. The anti-reflective layer controls the reflectivity and transmittance of a display screen. A liquid display panel(120) is located on lower part of the reflective layer and displays an image. A backlight assembly(130) provides light to a liquid display panel.

Description

Liquid crystal display device and anti-reflective layer manufacturing method {LIQUID CRYSTAL DISPLAY AND METHOD OF MANUFACTURING A ANTIREFLECTION LAYER}

The present invention relates to a liquid crystal display and a method of manufacturing the antireflection layer, which can reduce the reflectance of the display screen and can reduce the cost and time during the manufacturing process.

BACKGROUND ART Liquid crystal display devices have tended to be gradually widened due to their light weight, thinness, and low power consumption. The liquid crystal display includes a liquid crystal display panel in which liquid crystal cells are arranged in a matrix form between two transparent substrates, a backlight assembly for irradiating light to the liquid crystal display panel, and a driving circuit unit for driving the liquid crystal display panel and the backlight assembly. do.

Here, in the liquid crystal display device, an antireflection layer is formed on the liquid crystal display panel to reduce the reflectance of the display screen. The antireflection layer is formed of a plurality of optical thin film layers on the glass substrate to prevent reflection of the display screen. Many optical thin films are more effective in reducing the anti-reflection rate as the optical thin film layer is formed on the glass substrate.

At this time, the anti-reflection layer is formed using a vacuum deposition process to form a plurality of optical thin film layers on the glass substrate. As a result, the unit cost increases as the number of optical thin film layers increases, and a problem in that cost and time are increased by using a vacuum deposition process.

Accordingly, an object of the present invention is to provide a liquid crystal display and a method for manufacturing an antireflection layer which can reduce the reflectance of a display screen and can reduce the cost and time during the manufacturing process.

In order to achieve the above technical problem, in the liquid crystal display according to the present invention, an optical thin film layer having a different refractive index is formed on at least one layer on a transparent substrate, and 0.01 to 0.5 g per 100 g is black on any one of the at least one optical thin film layer. An anti-reflective layer for controlling the reflectance and transmittance of a display screen including a black dye series, a liquid crystal display panel positioned under the anti-reflective layer to display an image, and a backlight assembly for providing light to the liquid crystal display panel. Characterized in that it comprises a.

At this time, the black die series is characterized in that any one of carbon series, nigrisine series, acetylene series, denka series, Cachon series, aniline series.

Here, the thickness of the anti-reflection layer is characterized in that formed in 80 ~ 370nm.

In addition, the anti-reflection layer is characterized by consisting of a plurality of optical thin film layer in which a high refractive index layer, an ultra high refractive index layer, a low refractive layer is sequentially stacked on a transparent substrate.

In addition, the black die series is a chromium-based die, characterized in that consisting of 2-amino-5-nitrophenol, 2-napthol.

In addition, the black die series is a nigrosine type die, and is characterized by consisting of aniline, nitrobenzene, hydrochloric acid, and iron.

In order to achieve the above technical problem, the method of manufacturing an anti-reflection layer according to the present invention comprises the steps of providing a transparent substrate, and forming at least one optical thin film layer having a different refractive index on the transparent substrate through a wet coating process, It is characterized by blending a black dye (Black dye) series at any one of the at least one optical thin film layer at 0.01 ~ 0.5g per 100g.

At this time, the black die series is characterized in that any one of carbon series, nigrisine series, acetylene series, denka series, Cachon series, aniline series.

Here, the thickness of the anti-reflection layer is characterized in that formed in 80 ~ 370nm.

In addition, the black die series is a chromium-based die, characterized in that consisting of 2-amino-5-nitrophenol, 2-napthol.

In addition, the black die series is a nigrosine type die, and is characterized by consisting of aniline, nitrobenzene, hydrochloric acid, and iron.

In the anti-reflection layer according to the present invention, at least one optical thin film layer having a different refractive index is formed on a transparent substrate, and is formed by blending a black die series on at least one of the at least one optical thin film layer. Accordingly, the anti-reflection layer may be disposed on the liquid crystal display panel to reduce the reflectance of the display screen and increase the transmittance.

In addition, the anti-reflection layer according to the present invention is not difficult to blend the black die by forming a plurality of optical thin film layers through a wet coating process, it can reduce the cost and time compared to the conventional vacuum deposition process.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 5C.

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention. 2 is a cross-sectional view illustrating the antireflective substrate shown in FIG. 1.

As shown in FIG. 1, the liquid crystal display includes a liquid crystal display panel 120 for displaying an image by applying an image signal, a backlight assembly 130 for providing light to the liquid crystal display panel 120, and a liquid crystal display panel. The anti-reflective substrate 100 having a reflective color while reducing the reflectance of the panel guide 140, the upper and lower cases 110 and 190, and the liquid crystal display panel 120 that accommodate the 120 and the backlight assembly 130. It includes.

The liquid crystal display panel 120 includes a color filter substrate 122 and a thin film transistor substrate 124 bonded to each other with the liquid crystal interposed therebetween.

The color filter substrate 122 is a color filter array including a black matrix for preventing light leakage, a color filter for realizing color, a common electrode forming a vertical electric field with the pixel electrode, and an upper alignment layer thereon for liquid crystal alignment thereon. Is formed on the phase.

The thin film transistor substrate 124 includes a thin film including a gate line and a data line formed to cross each other, a thin film transistor formed at an intersection thereof, a pixel electrode connected to the thin film transistor, and a lower alignment layer coated thereon for liquid crystal alignment. A transistor array is formed on the lower substrate.

The panel guide 140 prevents the flow of the backlight assembly 130 and absorbs external shocks applied to the backlight assembly 130. In addition, the liquid crystal display panel 120 stacked on the panel guide 140 is supported.

The upper case 110 is formed to surround the edge of the backlight assembly 180 and the liquid crystal display panel 120 and the panel guide 140, and the liquid crystal display panel 120 and the backlight assembly 130 may be affected by an externally applied impact. To protect.

The lower case 190 has a rectangular frame shape. Inside the lower case 190, a space for accommodating and supporting the backlight assembly 130 is provided.

The backlight assembly 130 includes a lamp 142, an optical sheet unit 132, 134, 136, 138, and a light guide plate 137 to provide light to the liquid crystal display panel.

Lamp 142 may be used as a plurality of cold cathode fluorescent lamps (CCFLs) having a rod shape to produce light. Lamp electrode lines for applying a driving voltage of the lamp 142 are connected to both ends of the lamp 142. In addition, the lamp 142 may be used as an LED (Light Emitting Diode, not a cold cathode fluorescent lamp). As described above, the lamp 142 mentioned CCFL or LED, but is not limited thereto, and may be any lamp that can be used as a light source of the light emitting device.

The light guide plate 137 evenly distributes the light emitted from the lamp 142 to the front surface of the light guide plate 137 and guides the light toward the liquid crystal display panel 120. To this end, the light guide plate 137 is formed of an acrylic resin that is transparent and excellent in terms of refractive index, such as transparent and heat resistant polycarbonate (PC).

Meanwhile, the backlight assembly 130 is divided into an edge type and a direct type according to the position of the lamp 142. In the direct type, the lamp 142 has one or more lamps disposed on the lower surface of the liquid crystal display panel 120 to supply light to the entire liquid crystal display panel 120. The lamp 142 is positioned at the side of the light guide plate 137 to supply light to the liquid crystal display panel 120. Accordingly, the light guide plate 137 is required when the backlight assembly is an edge type, and is unnecessary when the backlight assembly is an edge type, and may be used according to a user's needs.

The optical sheet parts 132, 134, and 136 collect light from the light guide plate 140 and enter the liquid crystal display panel 120 to improve light efficiency. To this end, the optical sheet portion includes a protective sheet 132, a prism sheet 134, and a diffusion sheet 136.

The diffusion sheet 136 directs the light incident from the light guide plate 140 toward the front of the liquid crystal display panel 120, and diffuses the light to have a uniform distribution in a wide range so that the liquid crystal display panel 120 is irradiated. . The prism sheet 134 converts the light diffused by the diffusion sheet 136 so that the propagation angle is perpendicular to the liquid crystal display panel 120, thereby improving luminance and improving a viewing angle. It may also include a protective sheet 136 installed on the prism sheet 134 to protect the prism sheet 134 which is sensitive to dust or scratches and to prevent the flow of the sheets when transporting the backlight assembly. have. On the other hand, the diffusion sheet 136 and the prism sheet 132 is suitably combined to two or three pieces to diffuse or condense the light from the light guide plate 137 to improve the brightness or improve the viewing angle.

The anti-reflection layer 100 is formed on the liquid crystal display panel 120, and at least one optical thin film layer having a different refractive index is formed to reduce the reflectance of the display screen and have a reflective color according to a function.

The anti-reflection layer 100 may be formed of a plurality of optical thin films, such as the transparent substrate 102 and the high refractive index layer 104, the ultrahigh refractive layer 106, and the low refractive index layer 108 having different refractive indices on the transparent substrate 102. Can be stacked. A plurality of optical thin film layers of the high refractive index layer 104, the ultra high refractive index layer 106, the low refractive index layer 108 are sequentially coated on the transparent substrate 102 by a wet coating process, and the plurality of optical thin film layers of 80 nm to 370 nm It can be formed in thickness. In addition, the anti-reflection layer 100 may be formed of different high refractive index layers, ultra high refractive layers, and low refractive layers on the transparent substrate 102, but is not limited thereto. At least one layer may be formed of a thin film layer having a different refractive index. .

The color anti-reflection layer 100 is blended with a color die to blend a die having a reflective color on at least one of the plurality of optical thin film layers to realize a color according to a function. In order to control the reflectance and the transmittance of 100, a black die series is blended on at least one of the plurality of optical thin films.

In other words, as the black dye-based mixture is mixed with the optical thin film layer, the reflectance of external light reflected by the anti-reflection layer 100 may be reduced to within 2%, and the transmittance incident to the anti-reflection layer 100 is 90%. It can improve above and can improve a color sensitivity. That is, the anti-reflection layer 100 may adjust the transmittance and the reflectance of the anti-reflection layer 100 by mixing the black die series.

The black die series refers to particles having zero transmittance in the visible light region of the wavelength range of 380 to 780 nm, that is, particles having no transmission of 100% light. The black die series can be divided according to the series such as carbon series, nigrisine series, acetylene series, denka series, canyon series and aniline series. In the present invention, a description will be given using an example of using a nigrosine-based first black die and a chromium-based second black die.

The first black die is a nigrosine-based die, and consists of aniline, nitrobenzene, hydrochloric acid, and iron, and has the following [Formula 1].

The second black die is a chromium-based die, 2-amino-5-nitrophenol, 2-napthol, and has the following [Formula 2].

The first and second black dies may be blended at 0.01 to 0.5 g per 100 g in any one of the plurality of optical thin film layers. Preferably, when 2 g per 100 g of the first and second black dies are blended into any one of the plurality of optical thin film layers, the reflectance is reduced to within 2%, and the transmittance exhibits a transmittance of 90% or more.

The first black die exhibits color characteristics as shown in FIGS. 3A and 3B and Table 1 when 0.2g and 0.5g per 100g are mixed in any one of the plurality of optical thin film layers.

3A is a color sensitivity showing the case where the first black die is blended 2g per 100g to any one of the plurality of optical thin film layers, and FIG. 3B is 0.5g per 100g to the one of the plurality of optical thin film layers. The case of blending is shown.

Data Name L * (D65) a * (D65) b * (D65) Black Dye 0.2% 88.42 1.03 -5.59 Black Dye 0.5% 82.99 -0.70 -5.95 Before applying Black Dye 90.79 0.91 -4.76 Transparent substrate (glass) 89.41 0.88 -5.71

Table 1 shows the color characteristic results of mixing the first black die 0.2g or 0.5g per 100g to any one of the plurality of optical thin film layers shown in FIGS. 3A and 3B, and do not mix the black dye. It is a result of color characteristics shown in the case of not using and using glass which is a general transparent substrate. That is, L * means black sensitivity, a * means yellowness, and b * means redness. As the value of L * increases to 0, the brightness of black is represented, and as 100, the brightness of white is represented.

As shown in Table 1, when 0.2 g per 100 g of the first black die is mixed, L * represents 88.42, a * represents 1.03 and b * represents -5.59, and 0.5 g per 100 g is mixed. L * represents 82.99, a * represents -0.70, and b * represents -5.95.

Since the first black die exhibits the color coordinate characteristics as described above, and the second black die also exhibits the color coordinate characteristics similar to those of the first black die, it will be omitted.

The reflectance and transmittance for the case where the first and second black dies are blended 2g per 100g to any one of the plurality of optical thin film layers will be described.

4A and 4B are graphs showing reflectance and transmittance when the first and second black dies are blended with 2g per 100g of any one of a plurality of optical thin film layers.

4A is a graph showing the reflectance according to the wavelength band. The X axis represents the wavelength, and the Y axis represents the reflection. The first curve 150 is a curve showing the reflectance when the first black die is blended on the optical thin film layer, and the second curve 152 is the curve showing the reflectance when the second black die is blended on the optical thin film layer, The third curve 154 is a curve showing the reflectance before applying the black die to the optical thin film layer. Table 2 shows the average values of reflectance and transmittance before and after application of the first and second black dies.

4B is a graph showing transmittance according to the wavelength band. The X-axis represents the wavelength, and the Y-axis represents the transmittance. The first curve 150 is a curve showing transmittance when the first black die is blended on the optical thin film layer, and the second curve 152 is a curve showing transmittance when the second black die is blended on the optical thin film layer, The third curve 154 is a curve showing the transmittance before applying the black die to the optical thin film layer.

Before applying color dye After applying color dye Wavelength 550nm First black die (0.2%)
% R 3.5% 2.9% 1.8% % T 87.1% 86.9% 91.0% Second black die (0.2%)
% R 3.5% 3.1% 1.9% % T 87.1% 86.9% 91.2%

As shown in FIG. 4A and [Table 2], the antireflection layer has a reflectance of 3.5% before blending the black die to the optical thin film layer, and when the first black die or the second black die is blended, the antireflection layer 100 The reflectance was reduced to within 2% in the wavelength range of 550nm.

As shown in FIG. 4B and Table 2, the transmittance of the antireflection layer before blending the black die to the optical thin film layer is 87.1%, and when the first black die or the second black die is blended, the antireflection layer 100 The transmittance was increased to more than 90% in the wavelength range of 550nm.

As described above, the anti-reflection layer 100 may reduce the reflectance of the anti-reflection layer 100 by mixing the black die series, and may improve the transmittance.

The relationship between the reflectance and the transmittance is that when the reflectance is high, the amount of reflection of external light increases and the amount of transmitted light decreases accordingly. Therefore, the lower the reflectance, the better the transmittance. When the incident light is 100, the sum of the amount of transmitted light and the reflected light should be 100. However, 7.2 is the amount of light absorbed, except for 1.8% reflectance and 91.0% transmittance when the black die is applied in the 550 nm wavelength band.

5A to 5C are cross-sectional views illustrating a method of manufacturing an antireflection layer according to the present invention shown in FIG. 2.

Referring to FIG. 5A, the high refractive layer 104 blended with the black die series is coated on the transparent substrate 102 through a wet process.

Specifically, before forming the high refractive layer 104 on the transparent substrate 102, the transparent substrate 102 is washed and dried with a potassium hydroxide (KOH) solution. Thereafter, the black die series is blended into the high refractive solution to be used as the high refractive layer 104. By blending the black die series, the reflectance and transmittance of the antireflection layer can be adjusted.

The black die series can be divided according to the series such as carbon series, nigrisine series, acetylene series, denka series, canyon series and aniline series. As described above, although a plurality of series of black dies can be blended, the present invention describes a case where the first black die of the nigrosine series and the second black die of the chromium series are blended in the high refractive solution. Let's do it.

Nigrosine-based die, aniline (nitrobenzene), nitrobenzene, hydrochloric acid (hydrochloric acid), iron (iron) is formed by heat treatment at 200 ℃, the first having the formula [1] Black dies can be blended.

Alternatively, a chromium-based die, 2-amino-5-nitrophenol, 2-napthol, and may blend a second black die having [Formula 2] described above. It is not limited to the first black die or the second black die, and the user may blend the composition by changing the composition as needed.

The high refractive solution blended with the first or second black die is wet-coated for 20 to 40 seconds at 400 rpm to 600 rpm on the transparent substrate 102, and then dried for 1 to 30 minutes in the range of 80 to 250 ° C. The high refractive index layer 104 is formed on it. As a high refractive solution, it can use, for example as aluminum (Al).

Referring to FIG. 5B, the ultrahigh refractive layer 106 is coated on the transparent substrate 102 through a wet process on the transparent substrate 102 on which the high refractive index layer 104 is formed.

Specifically, the ultra-high refractive solution on the transparent substrate 102 is wet-coated for 20-40 seconds at 400rpm ~ 600rpm, and then dried for 1-30 minutes in the 80 ~ 250 ℃ ultra high refractive index on the layer 104 Layer 106 is formed. Here, as the ultrahigh refractive solution, for example, aluminum (Al), titanium (Ti), or an alloy thereof may be used.

Referring to FIG. 5C, the low refractive index layer 108 is coated on the transparent substrate 102 through a wet process on the transparent substrate 102 on which the ultrahigh refractive index layer 106 is formed. As a result, the antireflection layer 100 in which the high refractive index layer 104, the ultra high refractive index layer 106, and the low refractive index layer 108 are sequentially stacked on the transparent substrate 102 is formed.

Specifically, the low refractive solution on the transparent substrate 102 is wet-coated for 20 to 40 seconds at 400rpm ~ 600rpm, and then dried for 1 to 30 minutes in the 80 ~ 250 ℃ range on the ultra-high refractive layer 106 Refractive layer 108 is formed. Here, as the low refractive solution, for example, it can be used as a silicon series.

As described above, the black die is blended on the high refractive index layer 104, but the ultra high refractive index layer 106 and the low refractive index layer 108 may be blended. This can be changed by the user as needed.

In the detailed description of the present invention described above with reference to the preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge of the present invention described in the claims to be described later It is apparent that various modifications and changes can be made in the present invention without departing from the spirit and scope of the invention.

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view of the anti-reflection layer shown in FIG. 1.

3A and 3B show graphs of color characteristics when 0.2 g and 0.5 g of a first black die are mixed in any one of a plurality of optical thin film layers.

4A is a graph showing reflectance according to a wavelength band in a condition before or after application of a black die to an antireflection layer, and FIG. 4B is a graph showing transmittance according to a wavelength band.

5A to 5C are cross-sectional views illustrating a method of manufacturing an antireflection layer according to the present invention shown in FIG. 2.

<Explanation of symbols for the main parts of the drawings>

100: antireflection layer 102: substrate

104: high refractive layer 106: ultra high refractive layer

108: low refractive layer 110: upper case

120: liquid crystal display panel 140: panel guide

130: backlight assembly 190: lower case

Claims (11)

An optical thin film layer having different refractive indices is formed on at least one layer on a transparent substrate, and a black dye series is included in any one of the at least one optical thin film layer at 0.01 to 0.5 g per 100 g to reflect the transmittance and transmittance of the display screen. An antireflection layer to adjust; A liquid crystal display panel positioned below the anti-reflection layer and displaying an image; And a backlight assembly for providing light to the liquid crystal display panel. The method of claim 1, The black die series is any one of carbon series, nigrisine series, acetylene series, denka series, cationic series, and aniline series. The method of claim 1, The thickness of the anti-reflection layer is a liquid crystal display, characterized in that formed in 80 ~ 370nm. The method of claim 1, The anti-reflection layer is a liquid crystal display device comprising a plurality of optical thin film layer in which a high refractive index layer, an ultra high refractive index layer, a low refractive layer is sequentially stacked on a transparent substrate. The method of claim 1, The black die series is a chromium series die, and a liquid crystal display comprising 2-amino-5-nitrophenol and 2-napthol. The method of claim 1, The black die series is a nigrosine type die, and is composed of aniline, nitrobenzene, hydrochloric acid, and iron. Providing a transparent substrate; Forming at least one optical thin film layer having a different refractive index on the transparent substrate through a wet coating process; Method for producing an anti-reflection layer, characterized in that the black dye (Bye dye) blending at least one layer of the optical thin film layer at 0.01 ~ 0.5g per 100g. The method of claim 7, wherein The black die series is any one of carbon series, nigrisine series, acetylene series, denka series, canyon series, aniline series. The method of claim 7, wherein The thickness of the anti-reflection layer is 80 ~ 370nm manufacturing method of the anti-reflection layer, characterized in that formed. The method of claim 7, wherein The black die series is a chromium-based die, 2-amino-5-nitrophenol, 2-napthol characterized in that the manufacturing method of the anti-reflection layer. The method of claim 7, wherein The black die series is a nigrosine-based die, and a method for producing an anti-reflection layer, comprising aniline, nitrobenzene, hydrochloric acid, and iron.

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