KR101201159B1 - Reflector, backlight assembly and liquid crystal display device having the same - Google Patents

Abstract

The present invention discloses a reflecting plate having a uniform brightness and improved light efficiency, a backlight assembly and a liquid crystal display device having the same.

The reflective plate of the present invention is added to the polymer material layer by adding a refractive means such as a plurality of fibers (fiber) containing a medium having a different refractive index than the polymer material layer to reflect the light incident on the reflecting plate through the refraction to achieve a uniform brightness It minimizes the light loss absorbed from the reflector to the light source to improve the light efficiency.

Reflector, Refractive Index, Fiber, Refraction, Reflection, Luminance

Description

REFLECTOR, BACKLIGHT ASSEMBLY AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

1 is an exploded perspective view showing a liquid crystal display device according to the prior art.

2 is a sectional view showing a reflecting plate according to a first embodiment of the present invention;

3 is a side perspective view of a reflector according to a first embodiment of the present invention;

4 is a diagram illustrating a path of light passing through a reflector including a plurality of fibers containing an air layer according to the first embodiment of the present invention.

FIG. 5 shows the path of travel of light through one fiber containing the air layer of FIG. 4. FIG.

FIG. 6 is a view showing a path of light passing through a reflector including a plurality of fibers containing first and second media having different refractive indices from the polymer material layer according to the second embodiment of the present invention.

7 is an exploded perspective view illustrating a backlight assembly including a reflector according to the first embodiment of the present invention.

8 is an exploded perspective view of a liquid crystal display device equipped with a backlight assembly including a reflector according to a first embodiment of the present invention.

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

200, 400, 600, 720, 829: reflector

210, 410, 610, 722, 830: polymer material layer

220, 420, 620, 728, 831: refraction means 230, 430, 724, 833: medium

240, 440, 640, 726, 832: Fiber 450, 650, 710, 821: Light source

630a, 630b: first medium, second medium 700, 820: backlight assembly

730, 822: Optical sheet 732, 823: diffusion sheet

734, 825: Prism Sheet 736, 827: Protective Sheet

800 liquid crystal display device 810 liquid crystal panel

The present invention relates to a reflector, a backlight assembly and a liquid crystal display device having the same, and more particularly, to a reflector having a uniform brightness and improved light efficiency, a backlight assembly and a liquid crystal display device having the same.

In general, thin film transistor liquid crystal displays (TFT-LCDs) have superior display resolutions than other flat panel displays, and the quality of a thin film transistor is higher than that of a cathode ray tube (CRT). It shows a characteristic of speed.

However, such a liquid crystal display device is a display device that is not self-luminous. That is, since the liquid crystal display is a light receiving device that displays an image by adjusting the amount of light coming from the outside, a backlight assembly having a light source for irradiating light to the liquid crystal panel is required.

Such a backlight assembly is classified into an edge type and a direct type according to the position of the light source with respect to the display surface. Among these, the direct type backlight assembly is widely used in large liquid crystal display devices of 30 inches or more because of high light utilization, simple handling, and no limitation on the size of the display surface.

The direct type backlight assembly does not require a light guide plate for converting the linear light of the light source into the surface light, and includes a plurality of light sources provided on the lower side of the display surface, and a reflector that reflects the light emitted from the light source to the display surface to prevent light loss. And optical sheets such as a diffusion sheet that scatters light on the light source and emits uniform light, and a prism sheet that condenses the light.

1 is an exploded perspective view illustrating a liquid crystal display according to the related art.

As shown in FIG. 1, the conventional liquid crystal display device 100 includes a liquid crystal panel 10 for displaying an image, a backlight assembly 20 for supplying a light source, and a top case for protecting the liquid crystal panel 10. 30, a mold frame 40 accommodating the backlight assembly 20, and a bottom case 50.

The backlight assembly 20 includes a light source 21 for generating light, a reflector 23 for reflecting light emitted from the light source 21 to the liquid crystal panel 10 in front, and a light source 21 on the light source 21. A diffuser sheet 25 arranged to enhance the light scattering effect, a prism sheet 27 for condensing light passing through the diffusion sheet 25 to increase light efficiency; And optical sheets 24 such as a protective sheet 29 for protecting the prism sheet 27.

As the light source 21, a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL) is used. Among them, a cold cathode fluorescent lamp that generates a line light source has a lifespan. It is long and has excellent spectral characteristics and is used a lot.

When power is applied to the electrode portions formed at both ends of the light source 21, the light is emitted, and both ends of the light source 21 are inserted into and coupled to grooves (not shown) formed at both sides of the bottom case 50.

The reflector 23 is disposed on the inner surface of the bottom case 50 so that the light generated from the light source 21 can be concentrated and irradiated in the direction of the liquid crystal panel 10, which improves the efficiency of using the lost light source. .

The optical sheets 24 serve to have a uniform brightness distribution as a whole, and the diffusion sheet 25, the prism sheet 27, and the protective sheet 29 for protecting the prism sheet 27 are disposed. do.

The prism sheet 27 is transmitted through the diffusion sheet 25 and diffuses in both vertical and horizontal directions, thereby refracting and condensing light whose brightness drops sharply, thereby increasing front luminance.

However, in the liquid crystal display device 100 of the direct type having the backlight assembly 20 as described above, a part of the light emitted from the light source 21 is directed to the diffusion sheet 25, and some of the light is reflected by the reflector 23. And enters the diffusion sheet 25. However, since there is a light source 21 between the reflecting plate 23 and the diffusion sheet 25, a part of the light reflected by the reflecting plate 23 is absorbed by the light source 21 and causes light loss, so that light efficiency decreases.

In addition, the liquid crystal display 100 may have a problem that luminance unevenness occurs between a region where the light source 21 is provided and a region where the light source 21 is not provided.

In order to improve the luminance non-uniformity as described above, a light diffuser plate that is strong in the two-dimensional plane is used, but this causes a problem of lowering the light efficiency.

Recently, the reflectance of the reflector can be improved by patterning the shape of the reflector in various shapes such as irregularities.

However, there is a difficulty in manufacturing the patterned reflector, and the reflectance can be improved, but there is a problem in that luminance unevenness occurs in the two-dimensional plane.

SUMMARY OF THE INVENTION An object of the present invention is to provide a reflector, a backlight assembly and a liquid crystal display having the same, which have a uniform brightness and which can improve light efficiency by minimizing light loss absorbed by a light source.

The reflective plate of the present invention for achieving the above object includes a polymer material layer, and the refractive means formed in the polymer material layer.

The refractive means is characterized in that a plurality of fibers containing a medium having a different refractive index from the polymer material layer.

In addition, the backlight assembly of the present invention for achieving the above object includes a light source, a reflector including refractive means formed in the polymer material layer, and an optical sheet formed on the light source.

In addition, the liquid crystal display device of the present invention for achieving the above object comprises a liquid crystal panel for displaying an image, and a backlight assembly for supplying a light source to the liquid crystal panel,

The backlight assembly includes a reflective plate including a polymer material layer and refractive means formed in the polymer material layer.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 and 3 are cross-sectional and side perspective views showing a reflecting plate according to a first embodiment of the present invention.

2 and 3, the reflector 200 according to the first embodiment of the present invention includes a polymer material layer 210 and refractive means 220 formed in the polymer material layer 210. .

The refractive means 220 is formed with a plurality of fibers 240 containing a medium 230 that is different in refractive index from the polymer material layer 210.

The reflective plate 200 has a rectangular plate shape, and the main component is formed of the polymer material layer 210 forming the reflective plate 200.

The polymer material layer 210 has a light transmittance, and the light absorbed into the reflector 200 by the light transmittance is contained in the refraction means 220, ie, the fiber 240, which is added to the inside of the reflector 200. It is refracted through the medium 230.

The polymer material layer 210 is formed of a material having a refractive index of 1.3 or more and is formed of a material having a refractive index of 1.3 to 1.6.

The polymer material layer 210 may be polyethylene terephthalate (PET), poly methyl methacrylate (PMMA), polyethylene naphthalate, triacetyl cellulose, polyarylate, polyimide, polyether sulfone , Cellophane, polyethylene (PE), polypropylene, polyvinyl alcohol, and the like. Generally, the polymer material layer 210 is mainly made of PET or PMMA material.

In addition, the fiber 240 forming material is formed of the same material as the polymer material layer (210). Therefore, since the refractive index of the fiber 240 is the same as the refractive index of the polymer material layer 210, the light is not refracted at the interface between the polymer material layer 210 and the fiber 240 of the reflector 200 and has straightness.

The fiber 240 is cylindrical having a predetermined thickness and has a diameter of about 100 μm. The fiber 240 includes a medium 230 having a refractive index different from that of the polymer layer 210.

The medium 230 having a refractive index different from that of the polymer material layer 210 is formed of a medium having a lower refractive index than the polymer material.

The medium 230 is formed of a material having a refractive index of 1.3 or less, and is formed of an air layer including air. That is, it is formed to have an air layer 230 by inserting air into the fiber 240.

As described above, in the case of using the refraction means 220 including the air layer 230 having a low refractive index medium inside the fiber 240, the light is refracted by Snell's law at the interface between the fiber 240 and the medium 230. In this case, since the angle of refraction is larger than the angle of incidence based on the normal direction, light may be widely spread from the light source to the periphery of the light source vertically by the neighboring fibers 240.

In addition, the filling rate of the refraction means 220 in the reflecting plate 200 is formed to be 40% or more to maximize the refraction of light passing through the medium 230 contained in the fiber 240 to effectively transmit the light to the periphery of the lower portion of the light source vertically Reflect.

The fiber 240 may be formed in a predetermined region of the upper layer, the middle layer, and the lower layer of the reflector 200, or may be formed over the entire region of the reflector 200. In particular, a plurality of layers are formed on the upper part of the reflector 200 in order to improve light efficiency by effectively dispersing light to the periphery of the lower part of the light source vertically through refraction.

In this case, the fiber 240 added to the reflector 200 may have a side-by-side shape in a first direction, a side-by-side shape in a second direction, a side-by-side shape in a first direction and a second direction perpendicular to the first direction, or a random shape. It can be arranged and formed.

However, the fiber 240 parallel to the first direction is parallel to the light source (not shown), and the fiber 240 parallel to the second direction is perpendicular to the light source.

The fibers 240 having the shape parallel to each other in the first and second directions are formed on the same layer of the reflector 200, and the fibers 240 having the shape parallel or random in the second direction perpendicular to the first direction and the first direction. ) Is not formed in the same layer of the reflector 200.

In particular, the fiber 240 has a plurality of layers arranged next to each other in a shape parallel to the upper layer of the reflector 200 in a first direction. In particular, the fiber 240 is formed wider than the area occupied by the light source under the light source vertical, thereby increasing the light efficiency of the peripheral portion of the light source vertical lower portion where the light source is not formed, thereby realizing uniform brightness, and simultaneously It is possible to maximize the light efficiency by minimizing the light loss absorbed by the light source after being irradiated and reflected back by the reflector.

The method of adding the fiber 240 containing the medium 230 to the reflective plate 200 may vary according to the arrangement of the fiber 240, and the reflective plate made of a polymer material layer 210 such as PET or PMMA ( 200).

In the case of forming the fiber 240 having a parallel shape in the first direction or the fiber 240 having a parallel shape in the second direction, the fiber 240 is formed on the polymer material layer 210 such as PET or PMMA. ) Is mixed and applied or formed by attaching the fiber 240.

In the case of forming a randomly shaped fiber 240 on the reflector 200, the fiber 240 cut to a predetermined size is mixed with the polymer material layer 210 such as PET or PMMA, and then coated or deposited. .

In addition, in the case of forming the fiber 240 having a parallel shape in the first direction and the second direction perpendicular to the first direction, the reflective plate 200 is formed in the polymer material layer 210 in the first direction and the second direction. After attaching the fiber 240 formed to be orthogonal, it is formed by applying the polymer material layer 210 on it again.

The method of adding the fiber 240 to the reflective plate 200 is not necessarily limited thereto, and may be variously changed according to the material of the polymer material layer or the shape of the fiber to be formed.

As mentioned above, the reflector 200 has a refractive index by adding a fiber 240 containing a medium 230 having a refractive index different from that of the polymeric material layer 210 as the refractive means 220 to the polymeric material layer 210. By finally reflecting light by using the refraction principle of light generated at the interface between the two different media, the light efficiency can be maximized by preventing the loss of light reabsorbed by the light source through the reflector 200, Dispersion can improve non-uniform brightness.

FIG. 4 is a view showing a path of light passing through a reflector including a plurality of fibers containing an air layer according to the first embodiment of the present invention, and FIG. 5 is a view through a single fiber containing the air layer of FIG. It is a figure which shows the movement path of light.

4 and 5 will be briefly described the movement path of the light passing through the reflecting plate including the refractive means according to the first embodiment of the present invention.

Referring to FIG. 4, the reflector plate 400 according to the first embodiment of the present invention includes a refractive means 420 having a plurality of fibers 440 including an air layer 430. The fibers 440 are formed of a plurality of layers adjacent to each other and side by side in a first direction parallel to the light source 450.

Here, the light extracted from the light source 450 to the light source vertical lower region A passes through the air layer 430, which is a medium 430 contained in the plurality of neighboring fibers 440, and repeats refraction to finally generate a light source ( 450) is reflected to the peripheral area B of the vertical lower portion.

In this case, the refraction principle of the light satisfies Snell's law, and thus the air layer 430 contained in the fiber 440 under the light source 450 has a lower refractive index than the polymer material layer 410, thereby refracting means 420. Since the light passing through the light exits through the adjacent refractive means 420 and exits to the peripheral region B of the vertical lower portion of the light source 450, the light passing through the light is prevented from being reabsorbed by the light source 450. You can.

In addition, the light source is formed and the light source is formed by broadly diffusing the light into the peripheral portion B of the vertical portion of the light source 450 passing through the refraction means 420 made of the fiber 440 containing the air layer 430. It is possible to improve non-uniform luminance between regions that are not.

Referring to FIG. 5, light is radiated from a light source (not shown) through a single fiber 440 containing the air layer 430 of FIG. 4, and thus, a tangential direction H ₁ of the fiber 440. Light having an arbitrary angle of incidence θ ₁ is incident from the normal ₁ l perpendicular to). The incident light passes through the air layer 430, which is a medium having a low refractive index, and according to Snell's law, part of the light is reflected at the same reflection angle θ ₂ as the incident angle θ ₁ by the Snell's law, and the rest of the light is It is refracted at any refraction angle θ ₃ greater than the incident angle θ ₁ . However, since the thickness of the fiber 440 is too thin so that the light refraction is insignificant, this will be ignored in the present invention.

FIG. 6 is a diagram illustrating a path of light passing through a reflecting plate including a plurality of fibers containing first and second media having different refractive indices from the polymer material layer according to the second embodiment of the present invention.

Referring to FIG. 6, the reflective plate 600 according to the second embodiment of the present invention includes a polymer material layer 610 and refractive means 620 formed in the polymer material layer 610.

The refractive means 620 is formed with a plurality of fibers 640 containing a first medium 630a or a second medium 630b having a different refractive index than the polymer material layer 610.

The reflective plate 600 has a rectangular plate shape, and the main component is formed of the polymer material layer 610.

The material of forming the polymer material layer 610 is the same as that of the first embodiment of the present invention.

The polymer material layer 610 is light transmissive, and the light absorbed into the reflector 600 by the light transmittance is the first means of the refraction means 620, ie, the fiber 640, which is added to the reflector 600. It is refracted through the medium 630a or the second medium 630b.

As in the first embodiment of the present invention, the fiber 640 is formed of the same material as the polymer material layer 610. Therefore, since the refractive index of the fiber 640 is the same as the refractive index of the polymer material layer 610, the light is not refracted at the interface between the polymer material layer 610 and the fiber 640 of the reflector 600 and has straightness.

The fiber 640 has a cylindrical shape with a predetermined thickness and has a diameter of about 100 μm. The fiber 640 includes a first medium 630a or a second medium 630b having a different refractive index from the polymer material layer 610 therein.

The first medium 630a having a different refractive index from the high molecular material layer 610 is formed of a medium having a lower refractive index than the high molecular material layer 610, and the second medium 630b is less than the high polymer material layer 610. It is formed of a medium having a high refractive index.

The first medium 630a is formed of a material having a refractive index of 1.3 or less, and is formed of an air layer including air. That is, it is formed to have an air layer 630a by inserting air into the fiber 640.

In addition, the second medium 630b is formed of a material having a refractive index of 1.4 or more and is formed of a material having a refractive index of 1.4 to 1.8. The second medium 630b is formed of, for example, a polycarbonate layer including polycarbonate having a refractive index of 1.586.

In this case, the fiber 640 containing the second medium 630b having the high refractive index is added to the vertical lower region A ′ of the light source 650, and the peripheral region B ′ of the vertical lower portion of the light source 650. The fiber 640 containing the first medium 630a having a low refractive index is added to prevent light loss absorbed from the reflecting plate 600 to the light source 650.

That is, by using the refraction means 620 made of the fiber 640 containing the second medium 630b having a high refractive index in the vertical region A ′ of the light source 650, the angle of incidence of the angle of incidence is determined based on the normal direction. Small to move away from the light source 650 of the reflecting plate 600, and then refracting the light through the refraction means 620 containing the first medium 630a having a low neighboring refractive index, so that the peripheral region of the vertical portion of the light source 650 vertically lower. By diffusing to B ', light is prevented from being reabsorbed by the light source 650.

Therefore, when the refractive means 620 using the fiber 640 containing the first medium 630a and the second medium 630b having different refractive indices is formed in the reflecting plate 600, the light efficiency may be further improved. As a result, a uniform brightness may be realized by increasing light efficiency of the peripheral area B ′ of the vertical lower portion of the light source 650 where the light source 650 is not formed.

According to the second embodiment of the present invention, since the fiber 640 containing the second medium 630b having a high refractive index has to be positioned in the vertical lower region A ′ of the light source 650, it is formed on the reflective plate 600. It should be manufactured in consideration of the position of the light source 650, except that the shape and the addition method of the fiber 640 is the same as the first embodiment of the present invention.

7 is an exploded perspective view illustrating a backlight assembly including a reflector according to a first embodiment of the present invention.

Referring to FIG. 7, the backlight assembly 700 includes a light source 710 for generating light, and refractive means 728 to reflect the light emitted from the light source 710 to a liquid crystal panel (not shown) in front. Reflecting plate 720 formed to include a, the diffusion sheet 732 disposed on the light source 710 to enhance the light scattering effect, and the light passing through the diffusion sheet 732 to increase the light efficiency And an optical sheet 730 such as a protective sheet 736 for protecting the prism sheet 734.

 A reflector plate 720 is disposed below the light source 710 so that light generated from the light source 710 may be concentrated and irradiated toward the front liquid crystal panel (not shown).

The reflecting plate 720 is a reflecting plate according to the present invention, and includes a refractive means 728 in a predetermined region inside the reflecting plate 720.

The reflecting plate 720 has a rectangular plate shape and is formed of a polymer material layer 722 having a refractive index of 1.3 or more, and a material such as PMMA or PET is mainly used. Here, the PMMA or PET has a light transmittance.

The refraction means 728 is formed by adding a plurality of cylindrical fibers 726 containing a polymer material layer 722 which is a main component of the reflecting plate 720 and a medium 724 having a different refractive index. In this case, the fibers 726 added to the reflecting plate 720 may have parallel shapes in a first direction, parallel shapes in a second direction, parallel shapes in a first direction and a second direction perpendicular to the first direction, or a random shape. It can be arranged and formed.

In particular, the refraction means 728 is formed by arranging the fibers 726 containing the medium 724 in the upper layer of the reflecting plate 720 next to each other in a side-by-side shape in a first direction parallel to the light source 710.

The refractive index of the fiber 726 is the same as the refractive index of the polymer material layer 722. The medium 724 contained in the fiber 726 is formed of an air layer including a material having a refractive index of 1.3 or less, for example, air.

The filling rate of the fiber 726 in the reflecting plate 720 is formed to be 40% or more, thereby forming a plurality of air layers 724 and reflecting light passing through the plurality of air layers 724 through refraction. Uniform luminance characteristics can be obtained by reducing the luminance deviation between the region where the light source 710 is disposed and the region where the light source 710 of 700 is disposed, thereby reducing the distance between the light source 710 and the optical sheets 730. The backlight assembly 700 can be thinned.

In addition, the light loss may be maximized by minimizing the light loss absorbed by the light source 710 after being taken out under the light source 710 and reflected by the reflector 700 again.

Since the reflective plate 720 is the same as the reflective plate forming material according to the present invention, a detailed description thereof will be omitted.

The light source 710 and the optical sheet 730 is a general one, which is known in the art, so a description thereof will be omitted.

8 is an exploded perspective view of a liquid crystal display device equipped with a backlight assembly including a reflector according to a first embodiment of the present invention.

Referring to FIG. 8, the liquid crystal display 800 according to the present invention includes a liquid crystal panel 810 for displaying an image, and a backlight assembly 820 for providing a light source 821 to the liquid crystal panel 810. .

Although not shown in the drawings, the liquid crystal panel 810 is formed by injecting a liquid crystal layer between an upper substrate and a lower substrate, and the lower substrate is a thin film including a gate electrode, a semiconductor layer, a source and a drain electrode on a first substrate. The upper substrate includes a black matrix, a color filter layer, an overcoat layer, a common electrode, and a spacer on a second substrate. In addition, after the upper substrate and the lower substrate are bonded by a seal material, liquid crystal is injected to complete the liquid crystal panel.

As a result, a part of the light emitted through the light source 821 of the backlight assembly 820 passes through the optical sheets 822 such as the diffusion sheet 823, the prism sheet 825, and the protective sheet 827, and is formed by the thin film transistor. When an arbitrary pixel is switched, the switched arbitrary pixel adjusts the light transmission amount of the light source 821 and passes through the liquid crystal layer of the liquid crystal panel 810 to display an image.

On the other hand, the light emitted from the light source 821 toward the reflecting plate 829 is repeated after the refracting process in the air layer 833 contained in the plurality of fibers 832, which is the refraction means 831 included in the reflecting plate 829 The light source 821 is reflected to the peripheral area of the vertical lower part, and then passes through the light diffusing sheet 822 to pass through the liquid crystal layer of the liquid crystal panel 810 to be displayed outside.

The liquid crystal display 800 is provided on the liquid crystal panel 810 to protect the liquid crystal panel 810, the mold frame 850 and the bottom in which the backlight assembly 820 is accommodated. It is formed further including a case 860.

The reflector 829 is provided in the backlight assembly 820 as a reflector according to the present invention.

The reflective plate 829 has a rectangular plate shape and is formed of a polymer material layer 830 having a refractive index of 1.3 or more, and a material such as PMMA or PET is mainly used. Here, the PMMA or PET has a light transmittance.

The refractive means 831 is formed by adding a plurality of cylindrical fibers 832 containing a polymer material layer 830 which is a main component of the reflective plate 829 and a medium 833 having a different refractive index. In this case, the fiber 832 added to the reflector 829 may be parallel to the first direction, parallel to the second direction, parallel to the first direction and the second direction perpendicular to the first direction, or random shapes. It can be arranged to be formed.

In particular, the refraction means 831 is formed by arranging the fibers 832 containing the medium 833 in the upper layer of the reflecting plate 829 next to each other in a parallel shape in a first direction parallel to the light source.

The refractive index of the fiber 832 is the same as the refractive index of the polymer material layer 830. The medium 833 contained in the fiber 832 is formed of an air layer including a material having a refractive index of 1.3 or less, for example, air.

The filling rate of the fiber 832 in the reflective plate 829 is formed to be 40% or more, thereby forming a plurality of air layers 833 and reflecting light passing through the plurality of air layers 833 through refraction. The luminance variation is reduced between the region where the light source 821 of the 820 is disposed and the region where the light source 821 is disposed to obtain uniform luminance characteristics, and the thin liquid crystal display device can be thinned by adopting the thinned backlight assembly 820.

In addition, light efficiency may be maximized by minimizing the light loss that is extracted under the light source 821 and then reflected by the reflector 829 and then absorbed by the light source 821.

Since the reflective plate 829 is the same as the reflective plate forming material according to the present invention, a detailed description thereof will be omitted.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but this is merely exemplary, and those skilled in the art may realize various modifications and other equivalent embodiments therefrom. I will understand. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

The present invention forms a reflecting plate by adding a refraction means composed of a plurality of fibers containing a medium having a different refractive index from the polymer material layer in the polymer material layer to form a reflection plate. By reflecting to the peripheral portion, there is an effect of providing a liquid crystal display device having a uniform brightness.

The present invention refracts light through a refractive means consisting of a plurality of fibers including a polymer material layer formed in a reflector and a medium having a different refractive index, and reflects the light to a peripheral portion of the lower part of the light source vertically, thereby preventing light loss from being reabsorbed by the light source. There is another effect to improve it.

The present invention has yet another effect of making the liquid crystal display device thinner by employing a thinner backlight assembly in the liquid crystal display device through a reflecting plate having a uniform brightness.

Claims (22)

A polymer material layer; And Refracting means formed in the polymer material layer, And the refraction means is a fiber containing a medium having a different refractive index than the polymer material layer. The method of claim 1, The polymer material layer is polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polyethylene naphthale
Y, triacetyl cellulose, polyarylate, polyimide, polyethersulfone, cellophane, polyethylene (PE), polyprop
Reflector, characterized in that formed of one selected from the group consisting of propylene, polyvinyl alcohol. The method of claim 1, The polymer material layer has a light transmissive plate, characterized in that. delete The method of claim 1, The fiber is a reflector, characterized in that formed of the same material as the polymer material layer. The method of claim 1, The medium having different refractive indices is a medium having a lower refractive index than the polymer material layer. The method of claim 1, The medium having a different refractive index is a medium having a higher refractive index than the polymer material layer. The method of claim 7, wherein The medium having a high refractive index is formed in the lower portion perpendicular to the light source of the reflecting plate. The method of claim 1, The refraction means is a reflection plate, characterized in that for reflecting light through refraction. The method of claim 1, The fiber is a reflection plate, characterized in that formed in a side by side in a first direction, side by side in a second direction, side by side in a first direction and a second direction perpendicular to the first direction or a random shape. Light source; A reflection plate including refractive means formed in the polymer material layer; And It includes an optical sheet formed on the light source, And said refractive means is a fiber containing a medium having a refractive index different from that of said polymeric material layer. The method of claim 11, The polymer material layer is polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polyethylene naphthale
Y, triacetyl cellulose, polyarylate, polyimide, polyethersulfone, cellophane, polyethylene (PE), polyprop
Backlight assembly, characterized in that formed of one selected from the group consisting of propylene, polyvinyl alcohol. The method of claim 11, And the polymer material layer has light transmittance. delete The method of claim 11, The fiber is a backlight assembly, characterized in that formed of the same material as the polymer material layer. The method of claim 11, The medium having a different refractive index is a medium having a lower refractive index than the polymer material layer. The method of claim 11, The medium having a different refractive index is a medium having a higher refractive index than the polymer material layer. The method of claim 17, The medium having a high refractive index is formed in the lower portion perpendicular to the light source of the reflector. The method of claim 11, And the refraction means reflects light through refraction. The method of claim 11, And wherein the fibers are formed side by side in a first direction, side by side in a second direction, side by side in a first direction and a second direction perpendicular to the first direction, or a random shape. The method of claim 11, The optical sheet is a backlight assembly, characterized in that the diffusion sheet, prism sheet and protective sheet. A liquid crystal panel displaying an image; And A liquid crystal display device comprising a backlight assembly according to any one of claims 11 to 13 and 15 to 21 for supplying a light source to the liquid crystal panel.

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