KR20110057528A - Back light module and lcd involving the same - Google Patents

Abstract

PURPOSE: A backlight module and liquid crystal display including the same are provided to prevent the fast performance degradation in order not to transfer the heat of light source to a liquid crystal display panel module. CONSTITUTION: A light source box(110) embeds light source. An optical fiber(120) is connected to the light source box. A light guide panel(130) is arranged in the lower side of a light guide panel. A light guide rod(140) is connected to the optical fiber. A rod reflection panel protects the outside of the light guide rod. A lower side reflection panel is arranged in the lower side of the light guide plate.

Description

Backlight Module and LCD Including The Same

One embodiment of the present invention relates to a backlight module and a liquid crystal display including the same. More specifically, in the backlight module, the light source is safe from impact, does not cause environmental pollution, can reduce the unit cost and power consumption, reduce the error in image quality or color expression due to color coordinate deviation between LEDs, The present invention relates to a backlight module and a liquid crystal display device that prevent heat from being transferred to a panel module as it is, thereby preventing a rapid deterioration of performance.

CRT (Cathode Ray Tube), one of the commonly used display devices, is mainly used for monitors such as TVs, measuring devices, and information terminal devices.However, due to the weight and size of the CRT itself, Could not respond actively to demands.

Therefore, in the trend of miniaturization and light weight of various electronic products, CRT has a certain limit in weight and size, and is expected to replace the liquid crystal display (LCD) and gas discharge using electro-optic effects. There are plasma display panels (PDPs) and electroluminescent displays (ELDs) using electroluminescent effects, among which researches on liquid crystal displays are being actively conducted.

In order to replace the CRT, liquid crystal display devices having advantages such as small size, light weight, and low power consumption have been actively developed. Recently, the liquid crystal display device has been developed enough to perform a role as a flat panel display device. In addition, the demand for the liquid crystal display device is continuously increasing as it is used for a monitor of a desktop computer and a large information display device.

Since most of the liquid crystal display devices are light-receiving devices that display images by controlling the amount of light coming from the outside, a separate light source for irradiating light to the LCD panel, that is, a back light, is necessary.

In general, a backlight used as a light source of a liquid crystal display is a method of disposing a cylindrical light emitting lamp, and is classified into an edge method and a direct method.

In the double-edge method, the lamp unit is installed on the side of the light guide plate for guiding the light, and the lamp unit surrounds the lamp that emits light, the lamp holder inserted into both ends of the lamp to protect the lamp, and the outer circumferential surface of the lamp. It is provided with a lamp reflector plate fitted to the side of the light guide plate to reflect the light emitted from the lamp toward the light guide plate.

The edge method in which the lamp unit is installed on the side of the light guide plate is mainly applied to a relatively small liquid crystal display device such as a monitor of a notebook computer, a netbook, and a desktop computer.

On the other hand, the direct type method has been developed mainly as the size of the liquid crystal display device has increased to 20 inches or more, and a plurality of lamps are arranged in a row on the lower surface of the diffuser plate to direct light directly to the front of the LCD panel. will be.

The direct method is mainly used for a large screen liquid crystal display device requiring high luminance because the light utilization efficiency is higher than that of the edge method.

However, the LCD which adopts the direct method is used as a large monitor or a TV, which takes longer to use than a notebook computer, and because the number of lamps and LEDs is larger, In LCDs, lamps that fail to turn on due to lamp failure and lifespan are more likely to appear.

In addition, in the edge method in which the lamp units are installed on both side surfaces of the light guide plate, due to lamp life and failure, for example, when only one lamp is not turned on, only the brightness on the screen is lowered.

However, in the direct method, since a plurality of lamps or LEDs are installed at the bottom of the screen, the life and failure of the lamps and the LEDs cause, for example, when one lamp is not lit, the portion where the lamp is not lit becomes significantly darker than the other. The part where the lamp does not light up immediately appears on the screen.

For this reason, since the lamp is frequently replaced in the direct type liquid crystal display device, the direct type liquid crystal display device should have an easy structure for disassembling and assembling the lamp unit.

As described above, the backlight arranged in the edge method and the direct method by using the cylindrical light emitting lamp is inferior in light efficiency due to the decomposition and assembly of the light emitting lamp and the heat generation of the light emitting lamp itself.

Such conventional edge type and direct type backlight have the following problems.

First, there is a problem that a linear lamp composed of a glass tube and gas such as mercury is vulnerable to shock, has a problem such as environmental pollution, and requires a separate countermeasure against environmental regulations that are gradually strengthened.

Second, in the case of using a large number of LEDs or a plurality of lamps as a light source, the cost and power consumption of the backlight module increases, and heat generation occurs.

Third, when using a large number of LEDs as a light source, there is a lot of room for a problem in image quality due to color coordinate deviation between the LEDs, there is a problem that the error is large in expressing a predetermined color.

Fourth, since the light source is disposed inside the backlight module, particularly near the panel module, heat generated from the light source is transferred to the panel as it is, and heat is generated in the panel itself, which may cause a rapid deterioration of performance.

Fifth, when the conventional edge type backlight is applied to a small size, the light emitting lamp is processed into a 'b' shape or a 'c' shape, and in this way, there is a lot of limitations in inferior moldability in processing to have a bend, and a work process This increases production costs.

Accordingly, the present invention has been made to solve the above problems, in the backlight module and the liquid crystal display device, first, the light source for irradiating light to the liquid crystal panel is safe from impact and does not cause the problem of environmental pollution, second, the backlight Third, the unit cost and power consumption of the module can be lowered. Third, the image quality and color expression errors are reduced due to the color coordinate deviation between LEDs. Fourth, the heat generated from the light source is not transmitted to the liquid crystal panel module. The purpose is to make it.

In order to achieve the above object, a backlight module according to an embodiment of the present invention includes a light source box in which a light source is embedded, an optical fiber having one end detachably connected to the light source box, a light guide plate disposed under the panel, and one end thereof A plurality of pattern grooves are provided on the side surface of the light guide plate so as to emit light from the side surface of the light guide plate to the optical fiber, and the side surface in the light guide plate direction is formed in a wedge shape that becomes thinner from the one end to the other end. And a housing provided at a lower side of the light reflection plate, a lower reflection plate disposed on a lower surface of the light guide plate, and an outer surface of the light reflection plate and a lower end of the lower reflection plate. It is characterized by.

In addition, the backlight module according to another embodiment of the present invention, a light source box with a light source, an optical fiber connected to one end of the light source box, and one end connected to the optical fiber to emit light in an upward direction. A plurality of pattern grooves are provided on a surface thereof, and an optical guide rod formed in a wedge shape in which the upper surface is thinned from the one end to the other end, and a module box having a reflection plate on an inner surface surrounding the outer side of the optical guide rod. Characterized in that it comprises a.

In addition, the liquid crystal display device according to another embodiment of the present invention, a liquid crystal panel comprising a liquid crystal panel and a backlight module for irradiating light to the liquid crystal panel, wherein the backlight module is a light source with a built-in light source A box; An optical fiber having one end detachably connected to the light source box, a light guide plate disposed under the panel, and one end connected to the optical fiber to emit light from the side of the light guide plate to the light guide plate, A pattern groove is provided, the light guide rod formed in a wedge shape in which the side of the light guide plate is thinned from the one end to the other end, a rod reflection plate surrounding the outside of the light guide rod, and a lower side disposed on the lower surface of the light guide plate. It characterized in that it comprises a reflecting plate, and a housing provided on the outer surface of the rod reflection plate and the lower end of the lower reflection plate.

In addition, the liquid crystal display device according to another embodiment of the present invention, a liquid crystal panel comprising a liquid crystal panel and a backlight module for irradiating light to the liquid crystal panel, wherein the backlight module is a light source with a built-in light source A box, an optical fiber having one end connected to the light source box, and one end of the pattern is provided with a plurality of pattern grooves on the upper surface to emit light in an upward direction, and the upper surface is thin in the other end direction from the one end. The paper is characterized in that it comprises a light guide rod formed in the shape of a wedge, and a module box surrounding the outer side of the light guide rod and provided with a reflecting plate on the inner surface.

According to the present invention as described above, first, since the light guide rod is used instead of the plurality of LEDs or lamps, it is possible to reduce the heat generation rate of the entire backlight module and increase the light efficiency, and secondly, one point light source as the light source of the backlight. Third, the power consumption can be reduced. Third, the light source can be separated and managed, making it easy to use, move, manufacture, and repair. Especially, a cooler such as a notebook computer or a netbook can be used as a cooler for the light source. The number and unit cost can be reduced. Fourth, it is easy to manufacture and shape light guide rod and pattern groove, so it is advantageous to apply to small size products. Fifth, because light guide rod is used instead of light emitting lamp, it is resistant to external impact and prevents environmental pollution. It becomes possible.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to that other component, but there may be another configuration between each component. It is to be understood that the elements may be "connected", "coupled" or "connected".

In the detailed description of the present invention, the first embodiment of the present invention is an edge type backlight module, and the second embodiment is a direct type backlight module. Hereinafter, the edge type of the first embodiment will be described.

1 is a front view showing a backlight module according to a first embodiment of the present invention, FIG. 2 is a sectional view showing a light source box and a cooler of FIG. 1, FIG. 3A is a perspective view showing a light guide rod of FIG. Figure 3a is a perspective view showing a pattern groove of Figure 3, Figure 3c is a cross-sectional view showing the light guide rod of Figure 1, Figure 4 is a cross-sectional view of Figure 1, Figures 5 and 6 are front views showing other embodiments of the first embodiment, Figure 7 8 is an exploded perspective view of a backlight module according to a first embodiment of the present invention, FIG. 8 is a front view showing a backlight module according to a second embodiment of the present invention, and FIG. 9 is a front view showing another embodiment of the second embodiment. 10 is an exploded perspective view of a backlight module according to a second embodiment of the present invention.

The backlight module 100 according to the first embodiment of the present invention is an edge type backlight module, and includes a light source box 110 having a light source 210 therein, and an optical fiber having one end detachably connected to the light source box 110. 120, the light guide plate 130 disposed below the panel 710, and one end of the light guide plate 130 connected to the optical fiber 120 to emit light from the side of the light guide plate 130 to the light guide plate 130. A plurality of pattern grooves 145 are provided on the side of the light guide plate 130, and the light guide rod 140 is formed in a wedge shape in which the side of the light guide plate 130 is thinned from the one end to the other end, and the A rod reflection plate 410 surrounding the outside of the light guide rod 140, a lower reflection plate 430 disposed on the lower surface of the light guide plate 130, and an outer surface of the rod reflection plate 410 and the lower reflection plate 430. It is configured to include a housing 420 provided at the bottom of the.

In addition, the backlight module 100 may further include a heat sink 150 provided on one side of the light source box 110 and a light source cooler 160 disposed on the rear surface of the light source box 110.

In addition, such a backlight module 100 and a liquid crystal panel 710 are configured to form a liquid crystal display device.

The light source cooler 160 is provided with a fan 220 therein and is disposed on the rear surface of the light source box 110. In some cases, a cooler such as a notebook, a netbook, a monitor, or the like, to which the backlight module 100 is assembled, may be used. have.

The light source 210 of the backlight module may be composed of any one of red, green, and blue LEDs, several white LEDs, or a general lamp. Therefore, it is possible to drastically reduce power consumption and heat generation as compared to the technology using a large number of LEDs as an edge type backlight module or a direct type backlight module, or using a conventional lamp as a light source, and the internal structure is simplified and assembly is possible. It can increase the production cost.

The light source 210 is embedded in the light source box 110 and disposed at an external location spaced apart from the panel 710, the lower reflector 430, the housing 420, and the like, and thus the light source 210 is disposed inside the backlight module. Compared to the prior art, the heat transmitted to the panel 710 can be greatly reduced, and a cooler used for a notebook or a monitor can also be used for the light source box 110.

The light source box 110 is made of a good heat transfer and is made of a light material, in particular, an aluminum material, and the optical fiber 120 is connected to the light source box 110 so as to totally reflect and transmit light toward the light guide rod 140, and the light guide rod. When 140 emits light to the light guide plate 130, the light guide plate 130 reflects the light to the panel 710.

Here, although not shown in the drawing, the optical fiber 120 is fixed to the light source box 110 by a clip for fixing the optical fiber or is detachably connected to the light source box 110 by a method such as being press-fitted to the light source box 110. This makes it easy to replace and repair parts when repairing products such as laptops, netbooks, and monitors.

The light guide rod 140 is formed in a wedge shape having a polygonal outer surface and one end thereof is connected to the optical fiber 120 through the connector 135 to be disposed on the side of the light guide plate 130 to uniformly and efficiently radiate light. The side surface in the direction of the light guide plate 130 is formed in a wedge shape that becomes thinner from one end connected to the optical fiber 120 to the other end direction.

When the light guide rod 140 is an edge type as in the first embodiment of the present invention, the light guide rod 140 is disposed on at least one side of the light guide plate 130 as shown in FIG. 5, or faces the light guide plate 130 as shown in FIG. 6. The beams may be disposed on both sides, respectively.

That is, when disposed on two consecutive side surfaces of the light guide plate 130 as shown in FIG. 5, the light guide rod 140 may be integrally formed.

In addition, when the light guide plate 130 is disposed on opposite sides of the light guide plate 130 as shown in FIG. 6, the light guide rods 140 may be disposed on each of the two side surfaces, and the optical fiber 120 may be connected to each of the light guide rods 140. .

In addition, the light guide rod 140 is provided with several pattern grooves 145 on the side of the light guide plate 130 so as to uniformly and efficiently radiate the light from the side of the light guide plate 130 to the light guide plate 130. Light emitted from the optical fiber 120 is changed to the light guide plate 130 by changing the optical path.

The pattern groove 145 is formed in a tooth shape or a curved shape. When the tooth is formed in a tooth shape as shown in FIGS. 3A to 3C, the depth of the bone formed at the deepest part of the tooth shape of the pattern groove 145 is shown. Is gradually formed in the other end direction is gradually shallower from one end to which the optical fiber 120 is coupled.

That is, the area of the pattern groove 145 is wide so that one end of the optical fiber 120, which is the direction in which light is incident, may increase the light efficiency, and the other end of the direction in which light is transmitted may be the pattern groove 145 for uniformity of light scattering. ) Area gradually decreases.

The pattern groove 145 gradually formed to have a smaller area may include a first inclined surface 145a formed in one direction in which the optical fiber 120 is coupled in one valley and a second inclined surface formed in the other end ( 145b).

Here, the first inclined surface 145a is formed at an angle A of 85 ° to 93 ° with an imaginary surface connecting bones and valleys adjacent to each other of the pattern groove 145, and the second inclined surface 145b is An angle B of 42 ° to 50 ° with the imaginary surface is formed, where an optimal angle is formed at 89 ° for the first slope 145a and 46 ° for the second slope 145b.

Therefore, the light incident from the light source 210 through the optical fiber 120 can be radiated toward the light guide plate 130 as much as possible, and the emitted light can be evenly and uniformly radiated.

The optical guide rod 140 is formed of at least one of polymethyl methacrylate (PMMA), poly ethylene terephthalate (PET), poly carbonate (PC), and acrylic materials.

Therefore, the unit price is low and the formability is good, in particular, there is an advantage that can be molded at a time by a molding method without the need for a separate processing step of the pattern groove.

As shown in FIG. 7, the edge type backlight module includes a diffusion sheet 730 for diffusing light emitted from the upper portion of the light guide plate 130 at a predetermined angle, and a prism for collecting the diffused light and transferring the light to the panel 710. Assembled with the sheet 720 and the like, a plurality of diffusion sheet 730 may be provided as needed.

Here, the diffusion sheet 730 is installed on the light guide plate 130 to obtain a uniform brightness according to the viewing angle, PET or PC resin is used as the material of the diffusion sheet 730 and the diffusion sheet At the top of 730 is a particle coating layer that serves to diffuse.

In addition, the prism sheet 720 is to increase the front luminance of the light that is transmitted and reflected through the upper portion of the diffusion sheet 730, so that only a light of a certain angle is transmitted, and the light incident at the remaining angle is total internal reflection to cause the prism sheet The light is returned to the lower part of 720, and the returned light is reflected by the lower reflector 430 attached to the lower part of the light guide plate 130.

Meanwhile, the backlight module 200 according to the second embodiment of the present invention, which is a direct backlight module, includes a light source box 110 in which a light source 210 is embedded, and an optical fiber 120 having one end connected to the light source box 110. ), One end is connected to the optical fiber 120 and a plurality of pattern grooves 145 are provided on the upper surface to emit light in an upward direction, and the upper surface is formed in a wedge shape that becomes thinner in the other end direction from the one end. It includes a light guide rod 140 is formed, and a module box 810 surrounding the outside of the light guide rod 140 and a reflecting plate is provided on the inner surface.

In addition, the backlight module 200 further includes a heat sink 150 provided on one side of the light source box 110 as shown in FIG. 2, and a light source cooler 160 disposed on a rear surface of the light source box 110. In this case, the light source cooler 160 is provided with a fan 220 therein and disposed on the rear surface of the light source box 110. In some cases, the backlight module 100 is assembled with a notebook, a netbook, a monitor, or the like. You can also use the cooler.

In addition, such a backlight module 200 and a liquid crystal panel 710 are configured to form a liquid crystal display device.

As the first embodiment of the present invention, the light source 210 of the backlight module may be formed of any one of red, green, blue LEDs, several white LEDs, or a general lamp, and is built in the light source box 110. The panel 710 is disposed at an external position spaced apart from the panel 710 or the module box 810.

Therefore, it is possible to significantly reduce power consumption, heat generation, and heat transmitted to the panel, compared to the conventional technology using a large number of LEDs or general lamps as a light source, and the internal structure is simplified to increase the assemblability and to be used in a laptop or a monitor. Can be used for the light source box.

In addition, the optical fiber 120 is detachably connected to the light source box 110 to facilitate replacement of parts and repair work when repairing products such as notebooks and monitors.

The light guide rod 140 is formed in a wedge shape having a polygonal outer surface and one end thereof is connected to the optical fiber 120 through the connector 135 and disposed below the panel 710 and the light scattering member 1010. The upper surface corresponding to the lower portion of the panel 710 and the light scattering member 1010 is formed in a wedge shape that is thinned from one end connected to the optical fiber 120 to the other end so as to uniformly and efficiently emit light.

When the optical guide rod 140 is a direct type as in the second embodiment of the present invention, the optical guide rod 140 is bent at least once in the inside of the module box 810 as shown in FIG. 8, or the inside of the module box 810 as shown in FIG. 9. One end of the plurality of light guide rods 140 disposed in the body is integrally formed and connected to the optical fiber 120.

In addition, a plurality of pattern grooves 145 are provided on the upper surface to emit light in the upper direction in which the panel is located, so that the light path from the optical fiber 120 is changed to emit the light path in the upper direction in which the panel is located. .

The pattern groove 145 is formed in a tooth shape or a curved shape, and the depth of each of the valleys is gradually shallower from one end to which the optical fiber 120 is coupled to the other end, so that light is incident to the optical fiber 120. One end of the combination of the pattern groove 145 is wide to increase the light efficiency, and the other end of the direction in which light is transmitted is gradually reduced in area for the uniformity of light scattering.

The tooth-shaped pattern groove 145 gradually formed to have a smaller area includes a first inclined surface 145a formed in one direction in which the optical fiber 120 is coupled in one valley and a second formed in the other end direction. It is formed of two inclined surfaces 145b.

The first inclined surface 145a is formed at an angle A of 85 ° to 93 ° with an imaginary surface connecting the valley and the valley of the pattern groove 145, and the second inclined surface 145b is 42 with the imaginary surface. It is formed at an angle (B) of ° ~ 50 °, where the optimum angle is formed of 89 ° for the first slope 145a, 46 ° for the second slope 145b.

Accordingly, the light incident from the light source 210 through the optical fiber 120 can be emitted to the upper direction where the panel or the light scattering member 1010 is located, and the emitted light can be evenly radiated.

The optical guide rod 140 is formed of at least one material of polymethyl methacrylate (PMMA), poly ethylene terephthalate (PET), poly carbonate (PC), or acrylic material as in the first embodiment of the present invention.

Therefore, the unit cost is low and the moldability is excellent. In particular, even when the optical guide rod is bent several times as shown in FIGS. 7 and 8 or when one end of several optical guide rods is connected, a separate processing step of the pattern groove is performed. There is an advantage that can be molded at a time by the molding method without the need.

Here, the light guide rod 140 exposed to the outside of the module box 810, as shown in FIG. .

The direct type backlight module 200 is assembled with the light scattering member 1010, the diffusion sheet 1020, the diffusion plate 1030, and the like disposed between the light guide rod 140 and the panel as illustrated in FIG. 10.

Here, the light scattering member 1010 prevents the shape of the light guide rod 140 from appearing on the display surface of the panel and provides a uniform illumination as a whole. 1020 and the diffusion plate 1030 may be disposed.

According to the present invention having the structure and shape as described above, first, since the light guide rod is used instead of the plurality of LEDs or lamps, it is possible to reduce the heat generation rate of the entire backlight module and increase the light efficiency, and secondly, to backlight one point light source. It can be used as a light source to reduce power consumption. Third, it is easy to use, move, manufacture and repair because the light source can be managed separately. Especially, a cooler such as a notebook computer or a netbook can be used as a light source cooler. The number of parts and unit cost can be reduced. Fourth, it is easy to manufacture and shape light guide rod and pattern groove, so it is advantageous to apply to small size products. Fifth, because light guide rod is used instead of light emitting lamp, it is resistant to external impact and prevents environmental pollution. It becomes possible.

In the above description, all elements constituting the embodiments of the present invention are described as being combined or operating in combination, but the present invention is not necessarily limited to the embodiments. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more.

In addition, the terms "comprise", "comprise" or "having" described above mean that the corresponding component may be included, unless otherwise stated, and thus excludes other components. It should be construed that it may further include other components instead. All terms, including technical and scientific terms, have the same meanings as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms commonly used, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be construed in an ideal or excessively formal sense unless explicitly defined in the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1 is a front view showing a backlight module according to a first embodiment of the present invention;

2 is a cross-sectional view showing a light source box and a cooler of FIG.

3A is a perspective view illustrating the light guide rod of FIG. 1;

Figure 3b is a perspective view showing the pattern groove of Figure 3a,

3C is a cross-sectional view illustrating the light guide rod of FIG. 1;

4 is a cross-sectional view of FIG.

5 and 6 are front views showing other embodiments of the first embodiment,

7 is an exploded perspective view of a backlight module according to a first embodiment of the present invention;

8 is a front view showing a backlight module according to a second embodiment of the present invention;

9 is a front view showing another embodiment of the second embodiment;

10 is an exploded perspective view of a backlight module according to a second embodiment of the present invention.

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

110: light source box 120: optical fiber

130: light guide plate 135: connector

140: optical guide rod 145: pattern groove

150: heat sink 160: light source cooler

210: light source 220: fan

410: rod reflector 420: housing

430: reflector plate

Claims (12)

A light source box having a light source; An optical fiber having one end detachably connected to the light source box; A light guide plate disposed under the panel; One end is connected to the optical fiber and a plurality of pattern grooves are provided on the side of the light guide plate so as to emit light from the side of the light guide plate, and the side of the light guide plate is thin in the other end direction from the one end. An optical guide rod formed of; A rod reflection plate surrounding the outer side of the optical guide rod; A lower reflection plate disposed on a lower surface of the light guide plate; And A housing provided on an outer surface of the rod reflector and a lower end of the lower reflector; Backlight module, characterized in that comprises a. The method of claim 1, The light guide rod is disposed on any one or more of the side surface of the light guide plate, or the backlight module, characterized in that disposed on each opposite side of the light guide plate.  A light source box having a light source; An optical fiber having one end connected to the light source box; An optical guide rod having one end connected to the optical fiber and having a plurality of pattern grooves formed on an upper surface thereof to emit light in an upper direction, wherein the upper surface is formed in a wedge shape that becomes thinner from the one end to the other end; And A module box surrounding the outer side of the light guide rod and having a reflector on an inner surface thereof; Backlight module, characterized in that configured to include. The method of claim 3, wherein The light guide rod is a backlight module, characterized in that arranged in the bending more than once inside the module box. The method of claim 3, wherein The optical guide rod is a backlight module, characterized in that the one end is formed integrally connected to the optical fiber. The method according to claim 1 or 3, The pattern groove may be formed in a tooth shape or curved shape, the depth of the valley is gradually formed shallower in the other end direction from one end to which the optical fiber is coupled. The method according to claim 1 or 3, The pattern groove is formed of a first inclined surface formed in one end direction in which the optical fiber is coupled in the valley and a second inclined surface formed in the other end direction, wherein the first inclined surface connects the valley and the valley of the pattern groove. And a 85 ° to 93 ° inclination and the second inclined surface is inclined to the virtual surface in a range of 42 ° to 50 °. The method according to claim 1 or 3, The optical guide rod is formed of at least one of polymethyl methacrylate (PMMA), poly ethylene terephthalate (PET), poly carbonate (PC), and acrylic materials. The method according to claim 1 or 3, The light source is a backlight module, characterized in that consisting of any one of red, green, blue LED, several white LED, or a general lamp. The method according to claim 1 or 3, The backlight module further comprises a heat sink provided on one side of the light source box, and a light source cooler disposed on the rear surface of the light source box. In the liquid crystal display device comprising a liquid crystal panel and a backlight module for irradiating light to the liquid crystal panel, The backlight module, A light source box having a light source; An optical fiber having one end detachably connected to the light source box; A light guide plate disposed under the panel; One end is connected to the optical fiber and a plurality of pattern grooves are provided on the side of the light guide plate so as to emit light from the side of the light guide plate, and the side of the light guide plate is thin in the other end direction from the one end. An optical guide rod formed of; A rod reflection plate surrounding the outer side of the optical guide rod; A lower reflection plate disposed on a lower surface of the light guide plate; And A housing provided on an outer surface of the rod reflector and a lower end of the lower reflector; Liquid crystal display device comprising a. In the liquid crystal display device comprising a liquid crystal panel and a backlight module for irradiating light to the liquid crystal panel, The backlight module,  A light source box having a light source; An optical fiber having one end connected to the light source box; An optical guide rod having one end connected to the optical fiber and having a plurality of pattern grooves formed on an upper surface thereof to emit light in an upper direction, wherein the upper surface is formed in a wedge shape that becomes thinner from the one end to the other end; And A module box surrounding the outer side of the light guide rod and having a reflector on an inner surface thereof; Liquid crystal display device comprising a.

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