KR20110057518A - Refractive light guide body and backlight unit and liquid crystal display device using the same - Google Patents

Refractive light guide body and backlight unit and liquid crystal display device using the same Download PDF

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Publication number
KR20110057518A
KR20110057518A KR1020090113959A KR20090113959A KR20110057518A KR 20110057518 A KR20110057518 A KR 20110057518A KR 1020090113959 A KR1020090113959 A KR 1020090113959A KR 20090113959 A KR20090113959 A KR 20090113959A KR 20110057518 A KR20110057518 A KR 20110057518A
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KR
South Korea
Prior art keywords
light guide
liquid crystal
light source
crystal display
light
Prior art date
Application number
KR1020090113959A
Other languages
Korean (ko)
Inventor
이소정
한길원
한재정
Original Assignee
엘지디스플레이 주식회사
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Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020090113959A priority Critical patent/KR20110057518A/en
Publication of KR20110057518A publication Critical patent/KR20110057518A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides

Abstract

The present invention relates to a reflective light guide that can be easily deformed by the heat of a light source or the surrounding environment and that can replace a light guide plate that is difficult to slim down the device, and a backlight unit and a liquid crystal display using the same. The reflective light guide includes a rectangular top surface having a plurality of holes formed therein; A lower surface facing the upper surface and spaced apart from the upper surface; And first to fourth surfaces connecting the four sides of the upper surface and the four sides of the lower surface to each other, wherein an area defined by the upper surface, the lower surface, and the first to fourth surfaces is hollow. At least one opening is formed in a portion of at least one of the first to fourth surfaces.

Description

REFRACTIVE LIGHT GUIDE BODY AND BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE USING THE SAME}

The present invention relates to a reflective light guide, a backlight unit using the same, and a liquid crystal display device.

BACKGROUND ART Liquid crystal display devices have tended to be gradually widened due to their light weight, thinness, and low power consumption. The liquid crystal display device is used as a portable computer such as a notebook PC, office automation equipment, audio / video equipment, indoor and outdoor advertising display devices, and the like. The transmissive liquid crystal display device, which occupies most of the liquid crystal display device, displays an image by controlling an electric field applied to the liquid crystal layer to modulate the light incident from the backlight unit.

The backlight unit is roughly divided into a direct type and an edge type. The direct type backlight unit has a structure in which a plurality of light sources are arranged in a row on the lower surface of the diffuser plate to direct light directly to the front surface of the liquid crystal display. In contrast, the edge type backlight unit has a structure in which a light source is disposed to face the side of the light guide plate, and a plurality of optical sheets are disposed between the liquid crystal display panel and the light guide plate. In the edge type backlight unit, a light source irradiates light to one side of the light guide plate, and the light guide plate converts linear light or point light emitted from the light source into planar light, thereby advancing the light toward the front of the liquid crystal display.

As shown in FIG. 1, the edge type backlight includes a cover bottom 1, a light source 2 for supplying light from one side of the cover bottom, and light from the light source 2 on the light guide plate 3. It is provided in the lower portion of the liquid crystal display panel to guide the liquid crystal display panel (not shown), and the light diffusion patterns 4 are provided on the bottom surface so that the light from the light source 2 is uniformly emitted to the upper portion of the whole surface. A light guide plate 3, a reflective sheet 5 for reflecting light transmitted through the lower surface of the light guide plate 3 to the front surface of the light guide plate 3, and optical sheets stacked on the light guide plate to supply uniform light to the liquid crystal display panel. It includes (6). In FIG. 1, the arrow shows a state in which light from the light source 2 travels inside the light guide plate 3 and is emitted to the upper surface of the light guide plate 3.

On the other hand, as the light source 2 of the backlight unit, a cold cathode tube (CCFL) has been used in the past, but in recent years, since it can be driven at a low voltage, power consumption is small, color reproducibility, contrast ratio is excellent, and the life is long. Light emitting diodes (hereinafter referred to as "LEDs") are in the spotlight.

In the edge type backlight, polymethylene methacrylate (PMMA: polymethylenemethacrylate) having good refractive index and good transmittance is mainly used as a material of the light guide plate 3 used to uniformly guide light from the light source 2 to the liquid crystal display panel. . However, the light guide plate 3 has a very excellent characteristic in light waveguide, but its weight is heavy, weak in heat, and low in strength. In particular, since the light guide plate 3 is weak in heat, when a light emitting diode (LED) is used as a light source, a phenomenon occurs in which a light incident portion of the light guide plate disposed adjacent to the LED melts due to heat generated by the LED. In addition, since the light is not emitted in the middle portion between the LED and the LED arranged on the printed circuit board, the light cannot be supplied sufficiently to the light incident surface of the light guide plate 3 corresponding thereto. Therefore, dark portions (dark portions) are generated corresponding to portions of the light guide plate on which light is not sufficiently supplied. In addition, in the case of a large display device, there is another problem that a hot spot occurs due to the warpage of the light guide plate.

In order to solve this problem, there may be a way to narrow the distance between the LED and the light guide plate as much as possible and increase the thickness of the light guide plate. However, narrowing the distance between the LED and the light guide plate causes a possibility of deformation of the light guide plate due to the heat of the LED, and increases the thickness of the light guide plate. It was not a valid solution in that the weight of the display device was rapidly increased, thereby counteracting the slimness of the display device and causing the price increase.

An object of the present invention is to solve the problems of the prior art, a reflective light guide that can be easily deformed by the heat of the light source or the surrounding environment, it is difficult to make the device slim, and a backlight unit using the same And a liquid crystal display device.

In order to achieve the above object, the reflective light guide according to the embodiment of the present invention comprises a rectangular upper surface formed with a plurality of holes; A lower surface facing the upper surface and spaced apart from the upper surface; And first to fourth surfaces connecting the four sides of the upper surface and the four sides of the lower surface to each other, wherein an area defined by the upper surface, the lower surface, and the first to fourth surfaces is hollow. At least one opening is formed in a portion of at least one of the first to fourth surfaces.

In addition, the backlight unit according to an embodiment of the present invention includes at least one light source for irradiating light; And at least one reflective light guide for converting light emitted from the light source into planar light and receiving the light source therein.

In addition, the liquid crystal display device according to an embodiment of the present invention includes a liquid crystal display panel for displaying an image; A light source for supplying light to the liquid crystal display panel; And converting the light emitted from the light source into planar light and supplying the light to the liquid crystal display panel, wherein the light source includes at least one reflective light guide.

In the above configuration, the plurality of holes formed in the upper surface of the reflective light guide is formed such that the diameter of the hole increases from one end of the upper surface to the other end, or is formed to have a higher density from one end of the upper surface to the other end thereof. desirable.

In addition, the upper surface, the lower surface, and the first to fourth surfaces of the reflective light guide are preferably formed of a material having a low specific gravity, heat resistance, and high reflectance, and examples of the material include polyethylene terephthalate (PET) and polycarbonate. (polycarbonate: PC), any one of MCPET (micro-forming polyethylene terephthalate), any one of Cr, Al and Br, or a mixture thereof is preferably used.

According to the reflective light guide according to the exemplary embodiment of the present invention, since the inside is formed of an empty space and is formed of a reflector having a small specific gravity, it is possible to reduce the weight and reduce the weight. In addition, since the light source is disposed inside the reflective light guide, there is an advantage that the space can be saved as much as the area occupied by the light source, compared to the case where the light source is disposed on the side or the bottom of the conventional light guide plate.

In addition, since the light source is disposed inside the reflective light guide and holes are formed in the upper surface of the reflective light guide whose density and size are adjusted according to the distance from the light source, it is possible to increase the uniformity of the light emitted to the upper surface of the reflective light guide. In addition, when applied to a modular liquid crystal display device, a phenomenon in which a bright line is generated at a boundary line between adjacent sub light guide plates can be removed.

Hereinafter, a backlight unit and a liquid crystal display using the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals denote like elements throughout the specification.

First, the reflective light guide according to the embodiment of the present invention will be described in detail with reference to FIGS. 2 to 5. 2 is an exploded perspective view showing a reflective light guide according to an embodiment of the present invention, FIG. 3 is a plan view of the reflective light guide shown in FIG. 2, and FIGS. 4 and 5 are modified according to a light source used with the reflective light guide. The left side view, the bottom view, and the right side view of the reflective light guide are shown.

2 and 3, in the reflective light guide 20 according to the exemplary embodiment of the present invention, the light emitted from the light source travels inside the reflective light guide 20 so that the end of the reflective light guide 20 is opposite to the light source. It is composed of a hollow box so that it can be processed. That is, the reflective light guide 20 is formed of a reflector having a high reflectivity at the upper surface 21a, the lower surface 21b, the left surface 22a, the right surface 22c, the front surface 22b, and the rear surface 22d. It is constructed in an empty form. A plurality of holes 23 are formed in the upper surface 21a of the reflective light guide 20 as shown in FIG. 3. These holes 23 formed in the upper surface 21a of the reflective light guide 20 are formed so as to increase in size from the side closer to the light source toward the far side. In addition, the size of the holes 23 formed in the upper surface 21a of the reflective light guide 20 may be the same, and in this case, the densely arranged toward the farther from the side closer to the light source. Since the intensity of light decreases as the light intensity increases from the side closer to the light source, and the distance from the light source decreases, the size and density of the holes 23 formed in the upper surface 21a of the reflective light guide 20 can be appropriately modified. According to this configuration, the reflective light guide 20 is diffusely reflected or totally reflected without reducing the amount of light irradiated onto the light incident surface to the outside through a plurality of holes 23 formed in the upper surface 21a of the reflective light guide 20. Since it emits, uniform light can be obtained.

In addition, the reflective light guide 20 according to the embodiment of the present invention is formed using a material having a small specific gravity, a relatively strong heat, and a high reflectance. To this end, the reflective light guide 20 is formed of any one of polyethylene terephthalate (PET), polycarbonate (PC), and micro-forming polyethylene terephthalate (MCPET), or any one of Cr, Al, and Br, or the like. It is formed by plating, coating or painting the mixed reflective material.

4 and 5 illustrate various embodiments of the reflective light guide 20 modified according to the type of light source used together. 4 shows a left side view, a bottom view and a right side view of a reflective light guide showing an example where the reflective light guide 20 according to the embodiment of the present invention is used with a point light source such as a light emitting diode (LED). Drawing. Referring to FIG. 4, a first opening 25 corresponding to the size of the point light source is formed in the lower surface 21b of the reflective light guide 20 so that the point light source is accommodated in the reflective light guide 20. In the present exemplary embodiment, the first opening 25 is formed on the lower surface 21b of the reflective light guide 20, but the first opening 25 is the left surface 22a of the reflective light guide 20 as necessary. ) Or the right side surface 22c, and may be appropriately formed at the bottom surface 21b and a combination thereof.

5 is a reflection when the reflective light guide 20 according to the embodiment of the present invention is used with a line light source such as a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL), an external electrode fluorescent lamp (EEFL), or the like. It is a figure which shows the left side view, bottom view, and right side view of a light guide. Referring to FIG. 5, when the reflective light guide 20 is used together with the linear light source, the left side 22a or the right surface (the right side of the reflective light guide 20 is received so that the linear light source is received inside the reflective light guide 20). A second opening 26 corresponding to the size of the linear light source is formed in 22c). In the present embodiment, the second opening 26 is described as being formed on the left side 22a or the right side 22c of the reflective light guide 20, but the second opening 26 is the reflective light guide 20 as necessary. ) May be formed on the lower surface 21b, and may be appropriately formed at a position where these are combined.

6A to 6C are perspective views showing a state when a light source is accommodated in the reflective light guide 20 of the present invention. In these figures, only the light source accommodated in the reflective light guide 20 is shown for convenience.

4 and 6A, an LED 11 as a point light source is accommodated in the reflective light guide 20. In the figure, the state in which the LED 11 is arrange | positioned at the left surface 22a of the reflective light guide 20 is shown. The plurality of LEDs 11 are accommodated in the reflective light guide 20 through the plurality of first openings 25 formed in the left surface 22a or the lower surface 21b of the reflective light guide 20. 5 and 6B, a lamp 11 ′ as a linear light source is accommodated in the reflective light guide 20. In the figure, the state where the lamp 11 'is arrange | positioned at the left surface 22a of the reflective light guide 20 is shown. The lamp 11 ′ is received inside the reflective light guide 20 through a second opening 26 formed in the left side 22a or the lower surface 21b of the reflective light guide 20. FIG. 6C is a view illustrating a state in which a light source is accommodated in the modular type reflective light guide 20 'according to the embodiment of the present invention. Referring to FIG. 6C, a plurality of LEDs 11 are accommodated inside a plurality of sub reflective light guides 20a, 20b, and 20c, respectively. In the figure, the state in which the LED 11 is arrange | positioned at the left surface 22a of each of the sub-reflective light guides 20a, 20b, and 20c is shown. The plurality of LEDs 11 are inside the reflective light guide 20 'through the plurality of second openings 26 formed in the left side 22a or the lower surface 21b of each sub reflective light guide 20a, 20b, or 20c. Is accommodated in.

7A and 7B are perspective and side views illustrating a state in which the light source unit 10 is coupled to the reflective light guide 20 according to the embodiment of the present invention. 7A and 7B, the light source unit 10 includes an LED array including a plurality of LEDs 11 and a printed circuit board 13 on which the LEDs 11 are mounted. In the embodiment of FIGS. 7A and 7B, the LED 11 is accommodated inside the reflective light guide 20 through a plurality of first openings 25 formed in the lower surface 21b of the reflective light guide 20, and the printed circuit. The substrate 13 is exposed to the outside of the lower surface 21b of the reflective light guide 20. 7A and 7B, only the example in which the LED as the point light source is used as the light source has been described. However, the present invention may be applied to a lamp such as a CCFL as a linear light source.

8A and 8B are perspective and side views illustrating a state in which a light source unit is coupled to a modular type reflective light guide 20 '. 8A and 8B, the light source unit 10 includes an LED array including a plurality of LEDs 11 and a printed circuit board 13 on which the LEDs 11 are mounted. In the embodiment of FIGS. 8A and 8B, the LEDs 11 pass through each of the sub-reflective light guides 20a, 20b, through the plurality of first openings 25 formed in the bottom of each of the sub-reflective light guides 20a, 20b, 20c. 20c), and the printed circuit board 13 is exposed to the outside of the lower surface 21b of the reflective light guides 20a, 20b, and 20c.

Hereinafter, a liquid crystal display device having a backlight unit using the reflective light guide 20 according to the embodiment of the present invention will be described. 9 is a liquid crystal display having a backlight unit using a reflective light guide according to an embodiment of the present invention, Figure 10 is an exploded perspective view of the liquid crystal display shown in FIG. 9 and 10, the liquid crystal display device 100 includes a liquid crystal display panel 70, a backlight unit, and a case top 80.

The liquid crystal display panel 70 includes an upper glass substrate and a lower glass substrate facing each other with the liquid crystal layer interposed therebetween. The liquid crystal display panel 70 includes a pixel array for displaying video data. The pixel array of the lower glass substrate includes thin film transistors (TFTs) formed at intersections of data lines and gate lines, and pixel electrodes connected to the TFTs. Each of the liquid crystal cells of the pixel array is driven by the voltage difference between the pixel electrode charging the data voltage through the TFT and the common electrode to which the common voltage is applied to adjust the amount of light incident from the backlight unit to adjust the image of the video data. Display. In addition, a black matrix, a color filter, and a common electrode are formed on the upper glass substrate of the liquid crystal display panel 70. The common electrode is formed on the upper glass substrate in a vertical electric field driving method such as twisted nematic (TN) mode and vertical alignment (VA) mode, and a horizontal electric field such as IPS (In Plane Switching) mode and FFS (Fringe Field Switching) mode. In the driving method, the pixel electrode is formed on the lower glass substrate. In addition, a polarizing plate is attached to each of the upper glass substrate and the lower glass substrate of the liquid crystal display panel 70 to form an alignment layer for setting a pre-tilt angle of the liquid crystal.

The backlight unit includes a light source unit 10, a reflective light guide 20 that converts light emitted from the light source unit 10 into planar light, and emits the light to the front, and a plurality of optical sheets 40 disposed on the reflective light guide 20. And a cover bottom 50 coupled to the lower portion of the light source unit 10.

The light source unit 10 includes an LED 11 as a light source and a printed circuit board 13 on which the LED 11 is mounted. Instead of the LED 11, a linear light source such as CCFL, HCFL, EEFL may be used as the light source. In this case, the reflective light guide 20 as described with reference to FIG. 5 is used. As shown in FIG. 9, the LED 11 is accommodated in the reflective light guide 20, and the printed circuit board 13 is disposed on the outer lower surface of the reflective light guide 20. Since the reflective light guide 20 has been described in detail in the description of FIG. 2 to FIG. 8B, the description thereof will be omitted.

The optical sheets 40 are disposed on the reflective light guide 20 to increase the uniformity of the light projected through the reflective light guide 20 and to increase the luminance by refracting and condensing the light. In detail, the optical sheet 40 includes a diffusion sheet 41, a prism sheet 43, and a protective sheet 45. The diffusion sheet 41 diffuses the light emitted from the light guide plate 20 and supplies it to the liquid crystal display panel. The diffusion sheet 41 may be used by overlapping two or three sheets or more. The prism sheet 43 is formed on the upper surface of the prism sheet 43 so that a triangular prism-shaped micro prism has a constant arrangement. Since the micro prism is formed to have a predetermined angle, the prism sheet 43 collects the light diffused by the diffusion sheet 41 in a direction perpendicular to the surface of the upper liquid crystal display panel to provide a uniform luminance distribution. Can be. The protective sheet 45 protects the prism sheet 43 which is weak against scratches, thereby allowing the prism sheet 43 to provide a uniform luminance distribution to the liquid crystal display panel.

The cover bottom 50 is formed to surround the light source unit 10, the reflective light guide 20, and the optical sheets 40, a first support 51 for supporting the guide panel 60, and a reflective light guide. The second support part 53 which has a horizontal surface for supporting the 20 is provided.

The guide panel 60 has a sidewall contacting the upper wall of the case top 80 and a lower surface bent from the lower end of the sidewall and extending in the horizontal direction. The guide panel 60 is a rectangular mold frame in which glass fibers are mixed in a synthetic resin such as polycarbonate to support the liquid crystal display panel 70 and to uniformly space the gap between the liquid crystal display panel 70 and the optical sheets 40. Keep it.

The case top 80 is made of a metal material such as a galvanized steel sheet and has a structure surrounding the side wall of the guide panel 60. A hook or screw (not shown) is provided on at least one of the guide panel 60 and the cover bottom 50. ) Is fixed. The case top 80 accommodates the liquid crystal display panel 70 and the backlight unit together with the cover bottom 50, and defines an effective display area of the liquid crystal display panel 70.

7A to 9 illustrate a side view type LED in which a printed circuit board on which an LED is mounted as a light source is attached to a bottom surface of a cover bottom and light is emitted from the side of the LED. As described above, a top view type LED in which a printed circuit board on which the LED is mounted is attached to the sidewall of the reflective light guide and light is emitted from the front of the LED may be used. In this case, since the thickness of the printed circuit board can be saved, the liquid crystal display device can be made slimmer.

In addition, in the above embodiment, the liquid crystal display device having one reflective light guide is described. However, the present invention may be a modular liquid crystal display device using a plurality of sub-reflective light guide members. In this case, since the light source unit is accommodated in each of the sub-reflective light guides, the bright line appearing at the boundary between adjacent sub light guides can be obtained. Since the modular reflective light guide 20 ′ used in the modular liquid crystal display has been described in detail with reference to FIGS. 6C, 8A and 8B, the description thereof will be omitted.

11 is a view showing optical uniformity of the liquid crystal display device using the conventional light guide plate and the liquid crystal display device using the reflective light guide according to the embodiment of the present invention, respectively. FIG. 11A is a view simulating the uniformity of light in a liquid crystal display device using a conventional light guide plate. In FIG. 11A, area 1 represents an area of the light guide plate close to the light source side, and area 2 represents an area of the light guide plate far away from the light source side, and a part of area 2 is much darker than a part of area 1, and area 1 It can be seen that there is a significant difference in the uniformity of the light of the region 2 and the light. FIG. 11B is a view simulating the uniformity of light in the liquid crystal display device using the reflective light guide according to the embodiment of the present invention. In FIG. 11B, region 1 represents an area of the light guide plate close to the light source side, and region 2 represents an area of the light guide plate far away from the light source side, and there is no difference in the brightness of the portion of the region 1 and the region 2. It can be seen that there is no difference in the uniformity of light in the region 1 and the region 2 as a whole.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is a schematic structural diagram of an edge type backlight unit according to the prior art;

2 is an exploded perspective view showing a reflective light guide according to an embodiment of the present invention.

3 is a plan view of the reflective light guide shown in FIG. 2;

4 is a left side view, a bottom view and a right side view of the reflective light guide when the reflective light guide according to the embodiment of the present invention is used together with a point light source.

5 is a left side view, a bottom view, and a right side view of the reflective light guide showing an example in which the reflective light guide according to the embodiment of the present invention is used together with a linear light source.

6A to 6C are perspective views illustrating a light source accommodated in a reflective light guide according to an embodiment of the present invention. FIG. 6A is a perspective view illustrating a state in which an LED as a point light source is accommodated in a reflective light guide. Fig. 6C is a perspective view of a modular type reflective light guide showing a state in which a lamp as a circle is accommodated in a reflective light guide, and Fig. 6C is a state in which an LED as a point light source is accommodated in a plurality of sub reflective light guides.

7A is a perspective view illustrating a state in which an LED light source is coupled to a reflective light guide according to an embodiment of the present invention.

7B is a cross-sectional view illustrating a state in which an LED light source is coupled to a reflective light guide according to an embodiment of the present invention.

8A is a perspective view illustrating a state in which an LED light source is coupled to a sub reflective light guide of a modular type reflective light guide according to an embodiment of the present invention;

8B is a side view illustrating a state in which an LED light source is coupled to a sub-reflective light guide of a modular type reflective light guide according to an embodiment of the present invention.

9 is a cross-sectional view of a liquid crystal display device having a backlight unit using a reflective light guide according to an embodiment of the present invention.

FIG. 10 is an exploded perspective view of the liquid crystal display shown in FIG. 9;

11 is a view showing optical uniformity of a liquid crystal display using a conventional light guide plate and a liquid crystal display using a reflective light guide according to an embodiment of the present invention, respectively.

Description of the Related Art

10 light source 20 reflective light guide

23: hole 40: optical sheet

50: cover bottom 60: guide panel

70: liquid crystal display panel 80: case top

Claims (7)

A rectangular top surface having a plurality of holes formed therein; A lower surface facing the upper surface and spaced apart from the upper surface; And First to fourth surfaces connecting the four sides of the upper surface and the four sides of the lower surface, and The area defined by the upper surface, the lower surface, and the first to fourth surfaces is hollow, and at least one opening is formed in a portion of the lower surface and at least one of the first to fourth surfaces. Light guide. The method of claim 1, And the plurality of holes are formed such that the diameter of the holes increases from one end of the upper surface to the other end thereof. The method of claim 1, The plurality of holes is a reflective light guide, characterized in that the density is formed higher from one end of the upper surface to the other end. The method of claim 1, The upper surface, the lower surface, and the first to fourth surfaces are formed of a material having a small specific gravity, heat resistance, and high reflectance. The method of claim 4, wherein The material forming the upper surface, the lower surface and the first to fourth surfaces may be any one of polyethylene terephthalate (PET), polycarbonate (PC), micro-forming polyethylene terephthalate (MCPET), Cr, Al, and the like. A reflective light guide comprising any one of Br or a mixture thereof. At least one light source for irradiating light; And Converts light emitted from the light source into planar light, and includes at least one reflective light guide to receive the light source therein; The said reflective light guide is a backlight unit as described in any one of Claims 1-5. A liquid crystal display panel for displaying an image; A light source for supplying light to the liquid crystal display panel; And converting the light emitted from the light source into planar light and supplying the light to the liquid crystal display panel, wherein the light source includes at least one reflective light guide. The reflective light guide is characterized in that any one of claims 1 to 5 characterized in that the liquid crystal display device.
KR1020090113959A 2009-11-24 2009-11-24 Refractive light guide body and backlight unit and liquid crystal display device using the same KR20110057518A (en)

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KR20110057518A true KR20110057518A (en) 2011-06-01

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013015602A2 (en) * 2011-07-26 2013-01-31 Lg Innotek Co., Ltd. Lighting module
KR101272687B1 (en) * 2011-07-26 2013-06-10 엘지이노텍 주식회사 Lighting module
KR20140061006A (en) * 2012-11-13 2014-05-21 엘지디스플레이 주식회사 Backlight unit and display device having the same
CN103982815A (en) * 2013-10-03 2014-08-13 友达光电股份有限公司 Light source module
CN104296008A (en) * 2014-10-10 2015-01-21 京东方科技集团股份有限公司 Backlight module and display device
KR20190085195A (en) * 2018-01-08 2019-07-18 삼성디스플레이 주식회사 Backlight unit and display device including the same

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013015602A2 (en) * 2011-07-26 2013-01-31 Lg Innotek Co., Ltd. Lighting module
WO2013015602A3 (en) * 2011-07-26 2013-04-11 Lg Innotek Co., Ltd. Lighting module
KR101272687B1 (en) * 2011-07-26 2013-06-10 엘지이노텍 주식회사 Lighting module
US9880345B2 (en) 2011-07-26 2018-01-30 Lg Innotek Co., Ltd. Lighting module
KR20140061006A (en) * 2012-11-13 2014-05-21 엘지디스플레이 주식회사 Backlight unit and display device having the same
CN103982815A (en) * 2013-10-03 2014-08-13 友达光电股份有限公司 Light source module
US9348085B2 (en) 2013-10-03 2016-05-24 Au Optronics Corporation Light source module
CN104296008A (en) * 2014-10-10 2015-01-21 京东方科技集团股份有限公司 Backlight module and display device
KR20190085195A (en) * 2018-01-08 2019-07-18 삼성디스플레이 주식회사 Backlight unit and display device including the same

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