KR20110032486A - Back light unit with light-refractive patterns, its manufacturing method, and lcd device having it - Google Patents

Abstract

PURPOSE: A backlight assembly, a manufacturing method thereof, and a liquid crystal display including the same having a light refractive pattern are provided to implement a light refractive function of a simple structure due to forming a pattern for light refraction in the upper side of a PCB substrate. CONSTITUTION: A plurality of light sources is arranged in an upper side of a backlight substrate. An optical function sheet is transmitted to an LCD panel side. A resin layer(70) diffuses the light radiated from the light source between the backlight substrate and an optical function sheet(80). A light refractive pattern refracts the light, which is radiated from the light source.

Description

Back light unit with light-refractive patterns, its manufacturing method, and LCD device having it

The present invention relates to a backlight assembly provided in a liquid crystal display device, a manufacturing method thereof, and a liquid crystal display device including the backlight assembly.

The liquid crystal display is a display device using a passive optical element that does not emit light by itself, and is configured to display an image by using a backlight assembly provided on the rear side of the liquid crystal panel.

As the spread of liquid crystal display devices increases, various researches and developments for improving the image quality as well as slimming and lightening continue.

In particular, the role and function of the backlight assembly in the liquid crystal display device is becoming an important problem, because the size and light efficiency of the liquid crystal display device changes depending on the backlight assembly structure.

It looks at the backlight assembly of the prior art that can be contrasted with the present invention.

1 to 3 are views disclosed in Korean Patent Laid-Open Publication No. 10-2007-0042908.

1 is a cross-sectional view of an essential part of a liquid crystal display, and FIGS. 2 and 3 are a longitudinal sectional view and a plan view showing a dimming pattern provided in a light diffusion plate.

The liquid crystal display device of the disclosed patent invention as shown in these figures is provided with a liquid crystal panel unit 2 and a backlight unit 3 arranged on the rear side of the liquid crystal panel unit 2 to supply display light. .

The liquid crystal panel unit 2 is composed of a frame-shaped front frame member 4, a liquid crystal panel 5, a rear frame member 6, and the like.

The backlight unit 3 includes a light source unit 7 disposed on the rear side of the liquid crystal panel unit 2 to supply display light, a heat dissipation unit 8 that dissipates heat generated in the light source unit 7, and these The light source unit 7 and the heat dissipation unit 8 are held, and a back panel 9 or the like which is combined with the front frame member 4 or the rear frame member 6 is formed.

This backlight unit 3 has a size which opposes over the whole surface of the back side of the liquid crystal panel unit 2, and is combined in the state in which the opposing space part comprised between the liquid crystal panels 2 was optically sealed.

The light source unit 7 includes an optical sheet block 10 and a light source block 11, wherein the light source block 11 has a configuration in which a plurality of LEDs 12 are arranged in parallel at a predetermined interval.

The heat dissipation unit 8, the light source unit 7, and the liquid crystal panel 5 are laminated and attached to the back panel 9 on the front surface side thereof.

The optical sheet block 10 is provided to face the back side of the liquid crystal panel 5, and the optical function sheet laminate 13 formed by stacking various optical function sheets, the diffusion light guide plate 14 or the light diffusion plate ( 15), a reflective sheet 16, or the like, which are assembled to each other by the stud member 17 on the back panel 9.

Here, the light diffusion plate 15 is formed of a transparent synthetic resin material such as acrylic resin, and the display light supplied from the light source block 11 is incident.

In particular, a plurality of dimming patterns 18 are formed in a matrix in the light diffusion plate 15.

2 and 3, each of the dimming patterns 18 corresponds to a plurality of LEDs 12 constituting the light source block 11, and the light diffusion plate 15 is disposed so as to face each of the LEDs 12. It is formed in.

Each dimming pattern 18 is formed by printing, for example, a screen printing method, in the pattern forming area 20 of a shape slightly larger than the outline D of the LED 12. Each dimming pattern 18 is formed of light reflecting ink in which the light reflecting ink combines various ink materials including a light shielding agent and a diffusing agent in a predetermined ratio.

In addition, at the same time configured by the respective light modulation pattern 18 is a back and forth width (W ₁₎ (W ₂₎ is made onto the other substantially elliptical, the plurality of light-dots 18 shown in Figure 3, these light-dot Shows a shape consisting of a gradient pattern formed to gradually increase the light transmittance of the display light from the center area toward the peripheral area.

In this way, the light diffusion plate 15 forms the dimming pattern 18 to adjust the transmission amount of the display light incident directly from the corresponding LED 12 so that the occurrence of partial high luminance area is reduced, and the display light is removed from the entire surface. It is disclosed that the technique of functioning to uniformly supply the diffusion light guide plate 14 is disclosed.

However, in the liquid crystal display device of the present invention as described above, after the light emitted from the LED is reflected on the reflective sheet 16, some of the light is reflected in a substantially horizontal direction or transmitted toward the side of another LED region or device. As a result, some of the light transmitted toward the liquid crystal panel unit 2 is lost, and there is a problem in that a limit is generated in improving the luminance.

The present invention has been made to solve the above problems, by forming a pattern for refracting the light irradiated from the LED to the front of the LED arranged in a side structure, a light refractive pattern that can contribute to the overall increase in brightness It is an object of the present invention to provide a backlight assembly having the same, a method of manufacturing the same, and a liquid crystal display including the backlight assembly.

The backlight assembly of the liquid crystal display device according to the present invention for realizing the above object is a backlight substrate; A plurality of light sources arranged on the backlight substrate; An optical function sheet provided in front of the light source to transmit light emitted from the light source toward the LCD panel; A resin layer disposed between the backlight substrate and the optical function sheet to diffuse light emitted from the light source, and an upper portion of the backlight substrate forward the light emitted from the light source to increase the brightness of the liquid crystal display device. It is characterized in that the light refractive pattern to be refracted.

In addition, the backlight assembly of the liquid crystal display device according to the present invention for realizing the above object is a backlight substrate; A plurality of light sources arranged on the backlight substrate; An optical function sheet provided in front of the light source to transmit the light irradiated from the light source toward the LCD panel, and the light irradiated from the light source toward the front of the backlight substrate to increase the brightness of the liquid crystal display device; It is characterized in that the light refractive pattern to be refracted.

The light refractive pattern may be formed so that the thickness of the pattern gradually increases in proportion to the distance from the light source.

The photorefractive pattern may be formed by printing with an inkjet printer, and the photorefractive pattern may be formed such that the density of dots forming the pattern is gradually increased in proportion to the distance from the light source.

The photorefractive pattern is preferably printed using either white or black ink.

The photorefractive pattern may be directly formed on an upper surface of the backlight substrate.

In addition, a reflective layer coated with a reflective material may be formed on an upper surface of the backlight substrate, and the light refractive pattern may be formed on the reflective layer.

The reflective sheet may be disposed on an upper surface of the backlight substrate, and the light refractive pattern may be formed on the reflective sheet.

According to an aspect of the present invention, there is provided a method for manufacturing a backlight assembly of a liquid crystal display device, the method including: forming an electrode pattern on a PCB; After the electrode pattern is formed through the first step, a second step of attaching and fixing the LED on the PCB may include increasing the luminance of the liquid crystal display on the PCB after the first step or after the second step. It is characterized in that to form a light refractive pattern for refracting the light emitted from the light source to the front.

When the reflective layer is formed on the PCB, the reflective layer may be formed by coating a reflective material on the PCB after the first step or after the second step before forming the photorefractive pattern.

On the other hand, the liquid crystal display device according to the present invention for realizing the above object is a backlight assembly constructed and manufactured as described above; It is configured to include an LCD panel disposed in front of the backlight assembly.

The main problem solving means of the present invention as described above, will be described in more detail and clearly through examples such as 'details for the implementation of the invention', or the accompanying 'drawings' to be described below, wherein In addition to the main problem solving means as described above, various problem solving means according to the present invention will be further presented and described.

The backlight assembly according to the present invention, a manufacturing method thereof, and a liquid crystal display device including the backlight assembly have the following effects.

The present invention has an effect that can contribute to the overall brightness increase of the liquid crystal display device because a photorefractive pattern for refracting the light irradiated from the LED forward is formed on the upper side of the PCB substrate that is in front of the LED arranged in a side structure to provide.

In addition, the present invention is configured to increase the thickness or density of the pattern as the distance away from the LED increases the optical refractive index to the front to provide an effect that can contribute to the increase in brightness.

In addition, the present invention, by forming a pattern for photorefractive on the PCB substrate using a method such as printing provides an effect that can implement a photorefractive function with a simple structure.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

In describing various embodiments of the present invention, a description will be made mainly of a backlight assembly which is a feature of the present invention, and the configuration of the LCD panel, frame, etc. constituting the liquid crystal display device may be variously performed by combining a known configuration. The drawings and detailed description thereof will be omitted.

In addition, in describing various embodiments of the present invention, like reference numerals refer to like elements throughout the drawings and the detailed description, and repeated description thereof will be omitted.

For reference, FIGS. 4 to 7 illustrate embodiments of the backlight assembly including the light shielding pattern 100, and FIGS. 8 to 9 illustrate the backlight assembly including the light shielding pattern 100 and the light refractive pattern 200. 10 are embodiments of a backlight assembly having a photorefractive pattern 200.

4 is a plan view of the main part showing a first embodiment of the backlight assembly according to the present invention, Figure 5 is a cross-sectional view of the AA line direction of Figure 4, a cross-sectional view of the main part of a first embodiment of the backlight assembly according to the present invention, 6 is a detailed plan view showing a light shielding pattern included in a backlight assembly according to the present invention.

The backlight assembly according to the present invention includes a backlight substrate (50), a plurality of light sources (60) arranged at regular intervals on the substrate, at least one optical function sheet (80) disposed above the light source, Resin layer 70 for scattering the light emitted from the light source between the backlight substrate and the optical functional sheet 80 is configured.

Such a backlight assembly is disposed behind a LCD panel (not shown) constituting a liquid crystal display device and configured to display an image or an image by transmitting light emitted from the light source to the LCD panel.

The optical functional sheet 80 may be formed of a light guide sheet, a diffusion sheet, a prism sheet, or the like. In the drawings for referring to the present embodiment, the prism sheet 81 will be described as an example. However, it is also possible to use a diffusion sheet or a diffusion plate instead of the prism sheet 81.

In addition, the LCD panel, the optical function sheet 80, and the backlight assembly illustrated in the drawing may be integrally assembled by a frame (not shown) including the entire liquid crystal display as one module.

In such a liquid crystal display device, as described above, the LCD panel, the optical function sheet 80, and the like can be variously configured by combining known configurations.

Now, a description will be given of the backlight assembly illustrated in the drawings.

In the above, the backlight substrate may be a substrate on which a plurality of light sources are disposed. Preferably, the backlight substrate is formed of a PCB 50. The backlight substrate may be an illumination device for irradiating light. desirable.

In addition, when the light source is composed of the LED 60, as shown in Figure 1, the LED (60) is arranged in a vertical direction with respect to the LCD panel (TOP) structure or as shown in Figure 5 60 may be any side-type structure disposed in a horizontal direction with respect to the LCD panel, but the embodiment will be described with reference to the side-type structure.

As shown in FIG. 4, the LEDs 60 disposed on the PCB 50 are configured to be arranged in plural at regular intervals (or regions), and the arrangement structure of the LEDs 60 is appropriately changed according to the implementation conditions. Can be placed.

A reflective sheet 65 is preferably disposed on the upper surface of the PCB 50 so as to reflect the light emitted from the LED 60 toward the front of the LCD panel to increase the luminance.

Referring to FIG. 5, the LED 60 is an LED mold 61 or an LED frame attached to the PCB 50 and connected to an electrode pattern of the PCB 50, and a housing 63 provided in the LED mold 61. )

A resin layer 70 is provided between the PCB 50 and the prism sheet 81 on which the LEDs 60 are disposed. The resin layer 70 includes scattering particles 75 that increase luminance by refracting a straight light source. ) Is configured to include.

Scattering particles 75 may be composed of acrylic, glass, TiO ₂ powder fine particles, the scattering particles 75 is added to the resin and then stirred evenly after the PCB 50 and the prism sheet 81 The resin layer 70 can be constituted by injecting and curing in between.

The resin layer 70 may be divided into two layers. The layer adjacent to the PCB 50 substrate is formed of a low density resin layer 71 having a relatively low density of the scattering particles 75, and a prism sheet ( The layer adjacent 81 may be composed of a high density resin layer 75 having a relatively high density of scattering particles 75.

This is for the light irradiated from the LED 60 to be diffused to the surroundings while passing through the low density resin layer 71 and to be more evenly dispersed and diffused forward while passing through the high density resin layer 73.

When the resin layer 70 is formed of a plurality of layers as described above, the low density resin layer 71 is formed and cured on the upper surface of the PCB 50, and the high density resin layer 73 is formed on the prism sheet 81. It can be configured by the method of mutual bonding after curing after curing.

In particular, the light shielding pattern 100 having a diffusion function together with shielding of the light source is formed between the low density resin layer 71 and the high density resin layer 73 in the resin layer 70.

The light shielding pattern 100 is formed on the upper surface of the low density resin layer 71 after curing the low density resin layer 71 or the lower surface of the high density resin layer 73 after curing the high density resin layer 73. Can be formed on.

The light shielding pattern 100 has a high intensity of light as the light shielding pattern 100 is relatively closer to the LED 60 light source. The light transmittance may be increased in proportion to the distance. That is, the light shielding pattern 100 is configured to have a light transmittance lower as the light source is closer to the LED 60 light source, and to increase the light transmittance as the light source is farther from the LED 60 light source.

To this end, the light shielding pattern 100 may be formed such that the thickness of the pattern becomes thinner or the density becomes smaller in proportion to the distance from the LED 60 light source. In other words, the portion of the light source that is close to the light source is configured to have a thicker pattern or a higher density, and the farther the light source, the thinner the pattern or the lower the density.

Such a method of forming the light shielding pattern 100 may be formed by printing using an inkjet printer or the like, wherein the low density resin layer 71 or the high density resin layer is proportional to the distance from the LED 60 emitter. It is preferable to form so that the density of the dot printed on 73 will gradually become low. In this case, as shown in FIG. 6, the light shielding pattern 100 may be printed in a gradation shape by the density distribution of dots. That is, in FIG. 6, the portion closer to the LED light source shows a shape in which the density becomes lower as the dot becomes higher and further away.

In addition, when printing with an inkjet printer or the like, the method of changing the thickness of the light shielding pattern 100 may be made by a method of additionally printing (additional scanning) a relatively thick portion.

On the other hand, the light shielding pattern 100 as described above is preferably formed in white or black so as not to cause problems in the color implementation of the liquid crystal display panel.

As described above, when the resin layer 70 is formed and the light shielding pattern 100 is formed therebetween, the light emitted from the LED 60 is uniformly scattered while passing through the resin layer 70 to the front. Part of the strong light transmitted through the LED mold 61, which is a portion close to the light source by the light shielding pattern 100, is scattered to the blocking or surroundings, so that the light can be provided more uniformly. do.

Meanwhile, in the above, the configuration in which the light shielding pattern 100 is formed between the low density resin layer 71 and the high density resin layer 73 is exemplified, but is not necessarily limited thereto. The high density resin layer 73 and the prism sheet 81 are not limited thereto. It is also possible to form the light shield pattern 100 between the (). The same may be formed between the resin layer 70 and the prism sheet 81 even when the resin layer 70 is composed of a single piece.

In addition, in the case where three or more resin layers 70 are formed, the position of the light shielding pattern 100 may be configured between appropriate layers depending on the implementation conditions.

7 is a cross sectional view of essential parts of a second embodiment of a backlight assembly according to the present invention.

The second embodiment illustrated in FIG. 7 shows a configuration in which the light shielding pattern 100 is provided between the low density resin layer 71 and the high density resin layer 73 in a state where the light shielding pattern 100 is formed on the light transmitting sheet 110.

That is, after the light shielding pattern 100 is formed on the light transmitting sheet 110 by printing or the like, the light shielding pattern 100 is inserted between the low density resin layer 71 and the high density resin layer 73.

At this time, the light transmissive sheet 110 may be composed of a transparent sheet of a very thin PET material capable of forming the light shielding pattern 100, and, if necessary, may be composed of a functional sheet including optical functions such as diffusion. It is possible.

The other configuration is the same as the configuration of the first embodiment described above, and therefore, repeated description is omitted.

In the second embodiment, since the light shielding pattern 100 does not need to be directly printed on the resin layer 70, the resin layer 70 may be inserted before the resin layer 70 is completely cured to be integrated with the entire resin layer 70. It is possible.

On the other hand, it is also possible to provide the light transmitting sheet 110 on which the light shielding pattern 100 is formed between the high density resin layer 73 and the prism sheet 81, and if necessary, light is provided below the prism sheet 81. It is also possible to form the shielding pattern 100.

8 is a cross sectional view of essential parts of a third embodiment of a backlight assembly according to the present invention.

In the third embodiment shown in FIG. 8, the light shielding pattern 100 is formed, and the light irradiated from the LED 60 is refracted to the reflective sheet 65 disposed on the upper surface of the PCB 50, thereby reducing the overall brightness. Shows an embodiment in which the photorefractive pattern 200 is formed together to increase.

Except for the configuration in which the photorefractive pattern 200 is formed, it is the same as the configuration of the first embodiment described above, and the same reference numerals will be given to the same components, and will be described with reference to the photorefraction pattern 200.

The light refraction pattern 200 is configured to increase the luminance of the liquid crystal display by refracting the light irradiated from the LED 60 light source and the specularly reflected light reflected from the reflective sheet 65 forward. That is, as the LED 60 light source is installed in the lateral direction, since a considerable amount of light irradiated from the light source may be widely spread in the horizontal direction, which is approximately parallel with the reflective sheet 65, the light refractive pattern 200 may be formed. The light irradiated approximately horizontally from the LED 60 light source and the light reflected from the reflective sheet 65 are refracted and transmitted forward after hitting the photorefractive pattern 200, thereby minimizing light loss as a whole to increase luminance. will be.

To this end, the photorefractive pattern 200 may increase the refractive index of the front side of the light reflected from the LED 60 light source and the reflective sheet 65 so as to increase the refractive index of the LED 60 light source from a position away from the LED 60 light source. It is preferable that the thickness of the pattern is gradually thickened in proportion to the distance to and is inclined as a whole.

When the light refractive pattern 200 is also formed by printing using an inkjet printer or the like like the light shielding pattern 100, a relatively thick portion is possible through an additional printing method, and also with the LED 60 light source. It is also possible to print in such a way that the density of the dots forming the pattern is gradually increased in proportion to the distance of. Through this, it is possible to increase the front refractive index of the light using the light refractive pattern.

Although the light refractive pattern 200 is not illustrated in the drawings, the light refractive pattern 200 may also be printed in a gradation shape similarly to the light shielding pattern 100 described above, and the color of the display image. It is preferably formed by white or black ink which can minimize the effect on the substrate.

9 is a cross-sectional view of essential parts of a fourth embodiment of a backlight assembly according to the present invention.

In the fourth embodiment illustrated in FIG. 9, the configuration is similar to that of the above-described third embodiment, but the configuration in which the reflective sheet 65 is not configured and the photorefractive pattern 200 is directly formed on the upper surface of the PCB 50 is illustrated. It is.

In this case, the method of forming the photorefractive pattern 200 formed on the upper surface of the PCB 50 may be formed in the same manner as the method of forming the photorefractive pattern 200 on the reflective sheet 65 in the above-described third embodiment. have.

The other configuration is the same as the configuration of the above-described third embodiment, and therefore, repeated description is omitted.

10 is a sectional view of principal parts of a fifth embodiment of a backlight assembly according to the present invention.

In the fifth embodiment illustrated in FIG. 10, the light shielding pattern 100 is not formed, and a reflective layer 55 coated with a reflective material is formed on the upper surface of the PCB 50, and photorefractive index is formed on the reflective layer 55. The configuration in which the pattern 200 is formed is shown.

Reflective layer 55 is made of a conventional reflective coating material, it is made of a reflective material of a material that will not interfere with the electrode pattern formed on the PCB (50). The photorefractive pattern 200 may be formed by the same structure and method as in the above-described third and fourth embodiments.

Now, a method of manufacturing a backlight assembly will be described with a focus on the method of forming the photorefractive pattern 200 according to the present invention as described above.

FIG. 11 is a view illustrating a manufacturing method sequence of an embodiment centered on a photorefractive pattern in the backlight assembly according to the present invention.

As shown in FIG. 11, an electrode pattern 52 constituting a circuit such as applying power to the LED 60 is formed on the PCB 50. In this case, the electrode pattern 52 is preferably formed using a conventional surface mounting technique (SMT).

After the electrode pattern 52 is formed, the LED 60 is attached and fixed on the PCB 50. At this time, the method of attaching the LED 60 can also be implemented using a known technique using an adhesive.

Thereafter, the photorefractive pattern 200 is printed by printing on the PCB 50 by inkjet or the like. When forming the photorefractive pattern 200, the thickness is partially possible by using a method of varying the number of prints, and by the method of varying the number of dots by adjusting the density.

In this case, since the photorefractive pattern 200 is directly printed on the PCB 50, the photorefractive pattern 200 may be integrally formed on the PCB 50 without additionally forming the photorefractive pattern on the reflective sheet or other sheet.

On the other hand, in the case of forming the reflective layer 55 on the PCB 50, before forming the electrode, attaching the LED 60, or forming the electrode pattern 52 and the photorefractive pattern on the PCB 50 It is also possible to form the reflective layer 55 by coating the reflective material on the PCB 50 before forming the 200.

Subsequently, after the resin layer 70 is formed and the light shielding pattern 100 is formed as necessary, the optical assembly sheet 80 such as the prism sheet 81 is combined to manufacture a backlight assembly.

12 is a diagram illustrating a manufacturing method sequence of another embodiment centered on the photorefractive pattern in the backlight assembly according to the present invention.

Unlike the exemplary embodiment illustrated in the eleventh embodiment described above, the photorefractive pattern 200 is printed on the PCB 50 on which the electrode pattern 52 is formed, and then the PCB 50 is attached and fixed. .

In this case, the reflective layer 55 may be formed on the PCB 50, and the reflective layer 55 may be formed by coating a reflective material on the PCB 50 before printing the photorefractive pattern 200.

As described above, the technical ideas described in the embodiments of the present invention can be performed independently of each other, and can be implemented in combination with each other. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art. It is possible. Accordingly, the technical scope of the present invention should be determined by the appended claims.

1 to 3 are views disclosed in Korean Patent Laid-Open Publication No. 10-2007-0042908,

1 is a cross-sectional view of an essential part of a liquid crystal display, and FIGS. 2 and 3 are a longitudinal sectional view and a plan view showing a dimming pattern provided in a light diffusion plate.

4 is a plan view of an essential part showing a first embodiment of a backlight assembly according to the present invention.

5 is a cross-sectional view taken along the line A-A of FIG. 4, and is a cross-sectional view of an essential part of a first embodiment of the backlight assembly according to the present invention.

6 is a detailed plan view showing a light shielding pattern included in a backlight assembly according to the present invention.

7 is an essential part cross sectional view of a second embodiment of a backlight assembly according to the present invention;

8 is a cross-sectional view of essential parts of a third embodiment of a backlight assembly according to the present invention.

9 is a cross-sectional view of essential parts of a fourth embodiment of a backlight assembly according to the present invention.

10 is a sectional view of principal parts of a fifth embodiment of a backlight assembly according to the present invention.

FIG. 11 is a view illustrating a manufacturing method sequence of an embodiment centered on a photorefractive pattern in the backlight assembly according to the present invention.

12 is a diagram illustrating a manufacturing method sequence of another embodiment centered on the photorefractive pattern in the backlight assembly according to the present invention.

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

50: PCB 52: electrode pattern

55: reflective layer 60: LED

65: reflective sheet 70: resin layer

71: low density resin layer 73: high density resin layer

75: scattering particles 80: optical function sheet

81: prism sheet 100: light shielding pattern

200: photorefractive pattern

Claims (11)

A backlight substrate; A plurality of light sources arranged on the backlight substrate; An optical function sheet provided in front of the light source to transmit light emitted from the light source toward the LCD panel; A resin layer provided between the backlight substrate and the optical function sheet to diffuse light emitted from the light source; And an optical refraction pattern formed on the backlight substrate to refract the light irradiated from the light source to the front to increase the luminance of the LCD. A backlight substrate; A plurality of light sources arranged on the backlight substrate; It is provided in front of the light source includes an optical function sheet for transmitting the light emitted from the light source toward the LCD panel, And an optical refraction pattern formed on the backlight substrate to refract the light irradiated from the light source to the front to increase the luminance of the LCD. The method according to claim 1 or 2, The light refractive pattern of the backlight assembly of the liquid crystal display device, characterized in that the thickness of the pattern is formed to gradually increase in proportion to the distance to the light source. The method according to claim 1 or 2, The photorefractive pattern is formed by printing with an inkjet printer, The light refractive pattern of the backlight assembly of the liquid crystal display device, characterized in that the density of the dot forming the pattern is gradually increased in proportion to the distance to the light source. The method according to claim 1 or 2, And the photorefractive pattern is printed using any one of white or black ink. The method according to claim 1 or 2, And the light refraction pattern is directly formed on an upper surface of the backlight substrate. The method according to claim 1 or 2, A reflective layer coated with a reflective material is formed on an upper surface of the backlight substrate, And the light refractive pattern is formed on the reflective layer. The method according to claim 1 or 2, The reflective sheet is disposed on the upper surface of the backlight substrate, The light refractive pattern is formed on the reflective sheet, the backlight assembly of the liquid crystal display device. Forming an electrode pattern on the PCB; After forming the electrode pattern through the first step, and a second step of fixing by attaching the LED on the PCB, After the first step or after the second step, the backlight assembly of the liquid crystal display device to form a light refractive pattern for refracting the light emitted from the light source to the front to increase the brightness of the liquid crystal display device on the PCB Manufacturing method. The method according to claim 9, When the reflective layer is formed on the PCB, the backlight assembly of the liquid crystal display device is formed by coating a reflective material on the PCB after the first step or after the second step before forming the photorefractive pattern. Manufacturing method. A backlight assembly provided in claim 1 or 2; And a LCD panel disposed in front of the backlight assembly.

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