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WO2011030941A1 - Local dimming backlight apparatus - Google Patents

Local dimming backlight apparatus Download PDF

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Publication number
WO2011030941A1
WO2011030941A1 PCT/KR2009/005167 KR2009005167W WO2011030941A1 WO 2011030941 A1 WO2011030941 A1 WO 2011030941A1 KR 2009005167 W KR2009005167 W KR 2009005167W WO 2011030941 A1 WO2011030941 A1 WO 2011030941A1
Authority
WO
WIPO (PCT)
Prior art keywords
light guide
light
guide plate
guide plates
reflector
Prior art date
Application number
PCT/KR2009/005167
Other languages
French (fr)
Korean (ko)
Inventor
유성일
Original Assignee
단비기술 유한회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 단비기술 유한회사 filed Critical 단비기술 유한회사
Priority to PCT/KR2009/005167 priority Critical patent/WO2011030941A1/en
Publication of WO2011030941A1 publication Critical patent/WO2011030941A1/en

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Classifications

    • 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
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • 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
    • G02B6/0045—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 by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • 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
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • G02B6/008—Side-by-side arrangements, e.g. for large area displays of the partially overlapping type
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to a backlight device such as a liquid crystal display device and a surface light source for illumination.
  • the present invention relates to a backlight device capable of implementing a local local dimming function by independently driving one or more LED light sources disposed.
  • a light guide panel is a plate that provides a path for uniformly scattering and diffusing light from a light source, and is applied to a light receiving type flat panel display device such as a liquid crystal display device or a backlight device used for lighting. .
  • a method of disposing a cold cathode fluorescent lamp (CCFL) or an LED is widely used.
  • FIG. 1 is a cross-sectional view schematically showing a conventional backlight device.
  • the conventional backlight device 10 includes a light guide plate 11, a reflective sheet 12 disposed below the light guide plate 11, a light source 13 provided on a sidewall of the light guide plate 11, and a light guide plate.
  • a diffusion sheet 16 provided on the upper surface of (11) and a prism sheet 17 provided on the upper surface of the diffusion sheet 16 are included.
  • the light source 13 a cold cathode fluorescent lamp or an LED may be used.
  • the light guide plate 11 is provided with a plurality of light guide patterns 11a for uniformly guiding the light incident into the light guide plate 11.
  • the backlight device 10 configured as described above, light irradiated from the light source 13 is incident on the light guide plate 11, and the incident light is guided through the light guide plate 11 as indicated by an arrow, and then the light guide pattern ( 11a) and exits to the outside of the light guide plate 11 and then hits the reflective sheet 12 or exits directly to the upper surface and passes through the diffusion sheet 16 or the prism sheet 17 on the upper surface.
  • 11a) has relatively uniform illuminance and reflection at each site.
  • the backlight device such as the prior art described above has a local dimming function even when the plurality of light sources 13 are blocked and the blocked light sources 13 are individually driven. This is not achieved smoothly.
  • the modules can be individually lit, thereby implementing a local dimming function.
  • a large number of LEDs must be used, and additionally, an additional light diffusing lens plate or a diffusion plate must be used to obtain a uniform surface light source.
  • the present invention has been made to solve the above problems, an object of the present invention, a backlight that can implement a local dimming function without consuming expensive cost of additional light diffusing lens plate or diffusion plate, etc. It is an object to provide a device.
  • a backlight device includes a plurality of light guide plates, cut portions formed on side surfaces or bottom surfaces of the light guide plates, one or more light sources provided on side surfaces or bottom surfaces of the light guide plates, and a first reflector provided on a bottom surface of the light guide plate. And a diffuser provided on an upper surface of the light guide plate, wherein the light source is obscured by the cutting part by arranging one or more light sources under the cutting part, and each of the one or more light sources independently drives a local dimming effect. It is characterized by the implementation.
  • the shape of the cut portion is characterized in that the step shape, curved slope shape or groove shape.
  • the side of the light guide plate is characterized in that the second reflector is further provided.
  • a backlight device includes at least one light source, a plurality of light guide plates, a first reflector provided on a bottom surface of the plurality of light guide plates, and a top surface of the plurality of light guide plates.
  • the backlight device including a diffusion material
  • at least one or more light guide plates of the plurality of light guide plates, the first cut portion having a predetermined shape is formed on the upper side of one side
  • the second reflector is provided on the first cut portion
  • a light source is disposed at a side end of the light guide plate on which the first cut part is formed
  • at least one or more light guide plates of the plurality of light guide plates have a second cut part having a predetermined shape at a lower portion of one side, and the first cut part and the second cut part.
  • the first cut portion or the second cut portion is characterized in that it has a shape of a straight, oblique, curved or stair shape or a combination thereof.
  • the second reflecting material is characterized by coating a resin reflecting sheet, a metallic reflecting plate, or a material having high light reflectance.
  • a reflective material, a light absorbing material or a light diffusing material is provided below the second cut portion.
  • the second cut portion is positioned over the entire light guide plate, and has a wedge shape.
  • the reflecting material provided in the lower part of the said 2nd cutting part is characterized by being integrated with the 2nd reflecting material.
  • FIG. 1 is a view illustrating a conventional backlight device.
  • FIG. 2 is a side sectional view showing a backlight device according to a first embodiment of the present invention.
  • FIG 3 is a side sectional view showing a backlight device according to a second embodiment of the present invention.
  • FIG. 4 is a side sectional view showing a backlight device according to a third embodiment of the present invention.
  • FIG. 5 is a side sectional view showing a backlight device according to a fourth embodiment of the present invention.
  • FIG. 6 is a side sectional view showing a backlight device according to a fifth embodiment of the present invention.
  • FIG. 7 is a side sectional view showing a backlight device according to a sixth embodiment of the present invention.
  • Figure 8 is a side cross-sectional view showing the shape of the first cut portion according to the present invention.
  • FIG 9 is a side sectional view showing a backlight device according to a seventh embodiment of the present invention.
  • FIGS. 2 to 5 are side cross-sectional views illustrating a backlight device according to an exemplary embodiment of the present invention, which illustrates a case where a cutout is formed on one side of the light guide plate.
  • Light guide patterns 210a are formed on upper and lower surfaces of the light guide plate 210.
  • each light guide plate 210 is formed with a cut portion 211 formed in a staircase shape (FIGS. 2 and 3) or a curved slope surface shape (FIG. 4) or a groove shape (FIG. 5).
  • At least one LED light source 220 is disposed on a side surface of the light guide plate 210, and the cut portion 211 of the side surface of the light guide plate 210 is viewed from an upper surface thereof so that the LED light source 220 is connected to the cut portion 211 of the light guide plate 210.
  • the light source is described as an example of the LED light source 220, but is not limited thereto, and other light sources such as a cold cathode fluorescent lamp may be used.
  • a first reflector 230 may be disposed below the light guide plate 210 to reflect light emitted from the lower surface of the light guide plate 210 upward.
  • a diffuser 240 for scattering and diffusing light is provided on the light guide plate 210.
  • the prism 250 for condensing light is provided on the diffusion material 240.
  • Light emitted from the LED light source 220 installed under the side cutouts 211 of each of the plurality of light guide plates 210 is incident into the light guide plate 210 and the light incident into each compartment of the light guide plate 210 is reflected by the total reflection effect.
  • the light guide pattern 210a has a low density at a portion where a relatively large amount of light from the light source reaches within each compartment of the light guide plate 210 so as to have a high density and a uniform surface light source. Then, by dividing the at least one LED light source 220 appropriately and differentially dimming so that the brightness of each compartment is differentially adjusted to the other compartment. For example, differential control may be performed in one light guide plate 210 or may be differentially controlled in units of the light guide plate 210. In this case, the LED light source 220 may be divided and driven by a plurality of LED combinations, and a plurality of LED light sources 220 may be integrated and used on a single substrate. The LED light source 220 may be installed in a direction opposite to the cutout 211 as shown in FIGS. 2 and 4 or toward the cutout 211 as shown in FIGS. 3 and 5.
  • the shape of the cutout portion 211 of the light guide plate 210 according to the present invention is a stepped cutout portion 211 as shown in Figs. 2 to 3 or a curved shape having a predetermined curvature as shown in Fig. 4. It may be a cut portion 211.
  • the length L in the left and right directions of the cut portion 211 is greater than the thickness D of the LED light source 220, so that the LED light source 220 is covered by the cut portion 211 of the light guide plate 210 when viewed from the top. Can be lost.
  • the shape of the cut portion 211 according to the present invention may be a groove shape as shown in FIG. That is, the cutting part 211 is formed in the groove shape on the lower surface of the light guide plate 210, and the LED light source 220 is arrange
  • the second reflector 500 may be additionally installed on the side surface of the light guide plate 210. Therefore, the light emitted from the LED light source 220 guides and moves inside the light guide plate 210, and the light moved into the light guide plate 210 is reflected by the second reflector 500 on the side of the light guide plate 210 to diffuse. Pass 240.
  • the prism 250 may be additionally installed on the diffusion material 240.
  • the cut portion 211 can be manufactured by various methods such as NC direct machining, injection molding, extrusion molding.
  • FIG. 6 to 7 are side cross-sectional views illustrating a backlight device according to another exemplary embodiment of the present invention
  • FIG. 8 is a side cross-sectional view showing the shape of a first cutout portion according to the present invention. 2 to 5, the cutting parts are formed on both side surfaces of the light guide plate 210.
  • the length L of the second cutout 213 is greater than the thickness D of the LED light source 220, and when viewed from the top, the LED light source 220 is connected to the second cutout 213. It has a structure that is covered by.
  • a plurality of light guide plates 210 are provided in the backlight device 200.
  • Light guide patterns 210a are formed on upper and lower surfaces of the light guide plate 210.
  • a first cutout portion 212 having a step shape is formed on the upper surface of one side of each light guide plate 210.
  • At least one LED light source 220 is disposed at a side end of the light guide plate 210 on which the first cutout 212 is formed.
  • a curved second cut portion 213 is formed on the lower surface of the other light guide plate 210.
  • the first cutout portion 212 installed at an upper portion of one side surface and the second cutout portion 213 provided at a lower portion of the other side surface of the next light guide plate 210 are partially coupled to each other, so that the backlight device 200 When looking down from the top surface has a structure that the LED light source 220 is covered by the second cut portion (213).
  • the first reflector 230 is disposed under the light guide plate 210 to reflect light emitted from the lower surface of the light guide plate 210 upward.
  • the second reflecting member 212a is provided at the first cut portion 212 provided at the upper side of one side.
  • a diffuser 240 for scattering and diffusing light is provided on the light guide plate 210.
  • the prism 250 for condensing light is provided on the diffusion material 240.
  • the second reflector 212a can be provided by applying a resin reflective sheet, a metallic reflector or a material having high light reflectance.
  • the second cut portion 213 is provided on the lower side of the other side of the light guide plate 210 may be provided with a reflector, light absorbing material or light diffusing material 240.
  • the reflective material when the reflective material is installed in the second cutout 213, the reflective material may be integrally provided with the second reflective material 212a.
  • Light emitted from the LED light source 220 installed on each side having the first cutouts 212 of the plurality of light guide plates 210 is incident into the light guide plate 210 and the light incident into each compartment of the light guide plate 210 is affected by the total reflection effect.
  • the light guide plate 210 is guided and moved inside.
  • the light incident on the first cutout 212 is reflected by the second reflector 212a and guided into the light guide plate 210.
  • the light guided to the light guide plate 210 and incident to the second cutout 213 is totally reflected or exits to the outside of the light guide plate 210.
  • the second cutout 213 is a reflector, a light absorbing material, or a light diffuser 213a. When is installed, the light is reflected, absorbed or diffused by the reflector, light absorber or light diffuser, so that the appearance can be brighter than the surroundings.
  • the light reaching the light guide pattern is emitted to the outside of the light guide plate 210 by an incident angle exceeding the total reflection threshold angle.
  • the light emitted from the lower portion of the light guide plate 210 is reflected by the first reflector 230, passes through the light guide plate 210 again, passes through the diffuser 240 on the upper surface of the light guide plate 210, and again prism 250. Pass through and exit to the front.
  • the light guide pattern 210a has a low density at a portion where a large amount of light from the light source arrives within each compartment of the light guide plate 210 and a high density at a portion where a relatively small amount of light arrives. 212).
  • a uniform surface light source is achieved, and one or more LED light sources 220 are properly separated, and then dimmed by differentially so that the brightness of each compartment is differentially controlled from the other compartments.
  • differential control may be performed in one light guide plate 210 or may be differentially controlled in units of the light guide plate 210.
  • the LED light source 220 may be divided and driven by a plurality of LED combinations, and a plurality of LED light sources 220 may be integrated and used on a single substrate. As a result, local dimming is easily performed in the edge light backlight device using the light guide plate 210.
  • the first cut part 212 has a shape in which the top of one side is a straight line, and the entire shape of one side of the second cut part 213 is a straight line.
  • a second reflector 212a may be installed on the upper surface of the first cutout 212 so that the strong light emitted from the LED light source 220 installed at the side end does not immediately exit to the front surface.
  • a reflecting material, a light absorbing material, or a light diffusing material 213a may be provided on the lower surface of the second cutting part 213, and the strong light emission generated in the second cutting part 213 may be controlled.
  • the shape of the first cut part 212 has a step shape, and in FIG. 7, only an upper portion of the side surface of the light guide plate 210 has an inclination.
  • the shape of the first cut portion 212, the upper portion of the side of the light guide plate 210 as shown in Figure 8 (a) has an inclination, the angle ⁇ is 90 degrees or more, or (b) curvature It is possible to have a curved slope having a shape.
  • various shapes such as a straight line, an oblique line, a curved line, and a combination thereof are possible. Formation of such cuts can be various methods such as NC direct machining, injection molding, extrusion molding.
  • FIG 9 is a side sectional view showing a backlight device according to a seventh embodiment of the present invention.
  • the first cutout portion 212 has a straight top shape on one side thereof, and the second cutout portion 213 is positioned over the entire light guide plate 210 to form a wedge shaped light guide plate 210. It shows a structure having a. And the 2nd reflector 212a is provided in the upper surface of the 1st cut part 212. FIG.
  • the wedge-shaped light guide plate 210 is used, since most of the light guided in the light guide plate 210 is emitted by the light guide pattern 210a, the strong light emission generated at the end of the second cutout 213 can be controlled. . Formation of such cuts can be various methods such as NC direct machining, injection molding, extrusion molding.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

Disclosed is a backlight apparatus having a local dimming function. The backlight apparatus comprises: a plurality of light guide plates; a cutting portion formed at lateral surfaces or lower surfaces of the light guide plates; one or more light sources installed at the lateral surfaces or the lower surfaces of the light guide plates; a first reflective material installed at the lower surfaces of the light guide plates; and a diffusion material installed at upper surfaces of the light guide plates. The backlight apparatus is configured to hide one or more light sources through the cutting portion by arranging the light sources at the lower part of the cutting portion and obtains a local dimming effect by independently driving each of the light sources.

Description

로컬디밍 백라이트 장치Local Dimming Backlight Device
본 발명은 액정표시소자, 조명용 면광원 등의 백라이트 장치에 관한 것으로서, 더욱 상세하게는 다수 개의 도광판의 측면에 소정형상의 절단부를 형성하고, 형성된 절단부의 하부에 하나 이상의 LED 광원을 배치한 후, 배치된 하나 이상의 LED 광원을 독립적으로 구동함으로써 국부적인 로컬디밍기능을 구현할 수 있는 백라이트 장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight device such as a liquid crystal display device and a surface light source for illumination. The present invention relates to a backlight device capable of implementing a local local dimming function by independently driving one or more LED light sources disposed.
통상적으로, 도광판(light guide panel)은 광원으로부터 나온 빛을 균일하게 산란 및 확산시키는 경로를 제공하는 플레이트로서, 액정 표시 소자와 같은 수광형 평판 표시 장치나, 조명 등에 사용되는 백라이트 장치에 적용되고 있다.In general, a light guide panel is a plate that provides a path for uniformly scattering and diffusing light from a light source, and is applied to a light receiving type flat panel display device such as a liquid crystal display device or a backlight device used for lighting. .
도광판을 사용한 백라이트 장치로는 냉음극 형광 램프(cold cathode fluorescent lamp, CCFL) 또는 LED를 배치하는 방식이 널리 사용되고 있다.As a backlight device using a light guide plate, a method of disposing a cold cathode fluorescent lamp (CCFL) or an LED is widely used.
도 1은 종래의 백라이트 장치를 개략적으로 도시한 단면도이다.1 is a cross-sectional view schematically showing a conventional backlight device.
도 1을 참조하면, 종래의 백라이트 장치(10)는 도광판(11)과, 도광판(11)의 하부에 설치된 반사시트(12)와, 도광판(11)의 측벽에 설치된 광원(13)과, 도광판(11)의 상면에 설치된 확산시트(16)와, 확산시트(16) 상면에 설치된 프리즘시트(17)를 포함한다. 광원(13)으로는 냉음극 형광 램프 또는 LED 등이 사용될 수 있다. 한편, 도광판(11)에는 도광판(11) 내로 입사된 빛을 균일하게 도광시켜 주기 위한 다수의 도광 패턴(11a)이 형성되어 있다.Referring to FIG. 1, the conventional backlight device 10 includes a light guide plate 11, a reflective sheet 12 disposed below the light guide plate 11, a light source 13 provided on a sidewall of the light guide plate 11, and a light guide plate. A diffusion sheet 16 provided on the upper surface of (11) and a prism sheet 17 provided on the upper surface of the diffusion sheet 16 are included. As the light source 13, a cold cathode fluorescent lamp or an LED may be used. Meanwhile, the light guide plate 11 is provided with a plurality of light guide patterns 11a for uniformly guiding the light incident into the light guide plate 11.
상기와 같이 구성된 백라이트 장치(10)는 광원(13)으로부터 조사된 광이 도광판(11)으로 입사되고, 입사된 광은 화살표로 표시한 바와 같이 도광판(11)을 통하여 도광된 다음에 도광패턴(11a)에 닿아서 도광판(11)의 외부로 빠져 나간 후 반사시트(12)에 부딪히거나 상면으로 바로 빠져나가서 상면의 확산시트(16)나 프리즘시트(17)를 통과하게 되며, 도광 패턴(11a)에 의하여 각 부위에서 비교적 균일한 조도를 가지며 반사하게 된다.In the backlight device 10 configured as described above, light irradiated from the light source 13 is incident on the light guide plate 11, and the incident light is guided through the light guide plate 11 as indicated by an arrow, and then the light guide pattern ( 11a) and exits to the outside of the light guide plate 11 and then hits the reflective sheet 12 or exits directly to the upper surface and passes through the diffusion sheet 16 or the prism sheet 17 on the upper surface. 11a) has relatively uniform illuminance and reflection at each site.
그러나, 위에서 기술된 종래기술과 같은 백라이트 장치는, 도광판(11)이 일체로 되어 있기 때문에, 다수개의 광원들(13)을 블록화하고, 블록화된 광원(13)을 개별적으로 구동한다고 하더라도 로컬디밍기능이 원활하게 달성되지 않는다.However, since the light guide plate 11 is integrated, the backlight device such as the prior art described above has a local dimming function even when the plurality of light sources 13 are blocked and the blocked light sources 13 are individually driven. This is not achieved smoothly.
또한, 도광판을 사용하는 대신, 수천 개의 LED 광원을 바닥에 배열하여 일정의 구획으로 나누어 모듈화한 후, 모듈별로 개별 점등함으로써, 로컬디밍기능을 구현할 수 있다. 하지만 이 경우 매우 많은 LED를 사용해야 하며, 또한 균일한 면광원을 얻기 위해서 추가의 광확산 렌즈판이나 확산판 등의 소자를 써야 하기 때문에 고가의 비용이 소요된다는 문제점이 있다.In addition, instead of using a light guide plate, by arranging thousands of LED light sources on the floor and dividing them into predetermined sections, the modules can be individually lit, thereby implementing a local dimming function. In this case, however, a large number of LEDs must be used, and additionally, an additional light diffusing lens plate or a diffusion plate must be used to obtain a uniform surface light source.
본 발명은 상기와 같은 문제점을 해결하기 위해 안출한 것으로, 본 발명의 목적은, 추가의 광확산 렌즈판이나 확산판 등의 소자에 따른 고가의 비용을 소모하지 않고도 로컬디밍기능을 구현할 수 있는 백라이트 장치를 제공하는 것을 목적으로 한다.The present invention has been made to solve the above problems, an object of the present invention, a backlight that can implement a local dimming function without consuming expensive cost of additional light diffusing lens plate or diffusion plate, etc. It is an object to provide a device.
상기의 목적을 달성하기 위하여 본 발명에 따른 백라이트 장치는, 다수 개의 도광판과, 도광판의 측면 또는 하면에 형성된 절단부와, 도광판의 측면 또는 하면에 설치된 하나 이상의 광원과, 도광판의 하면에 설치된 제1 반사재와, 도광판의 상면에 설치된 확산재를 포함하는 백라이트 장치에 있어서, 절단부의 하부에 하나 이상의 광원을 배치함으로써 절단부에 의해 광원이 가려지도록 구성되며, 하나 이상의 광원을 각각 독립적으로 구동함으로써 로컬디밍 효과를 구현하는 것을 특징으로 한다.In order to achieve the above object, a backlight device according to the present invention includes a plurality of light guide plates, cut portions formed on side surfaces or bottom surfaces of the light guide plates, one or more light sources provided on side surfaces or bottom surfaces of the light guide plates, and a first reflector provided on a bottom surface of the light guide plate. And a diffuser provided on an upper surface of the light guide plate, wherein the light source is obscured by the cutting part by arranging one or more light sources under the cutting part, and each of the one or more light sources independently drives a local dimming effect. It is characterized by the implementation.
바람직하게는, 상기 절단부의 형상은, 계단 형상 또는 곡선 경사면 형상 또는 홈 형상인 것을 특징으로 한다.Preferably, the shape of the cut portion is characterized in that the step shape, curved slope shape or groove shape.
또한, 상기 절단부가 도광판의 하부에 형성되는 경우, 도광판의 측면에는 제2 반사재가 추가로 설치되는 것을 특징으로 한다.In addition, when the cut portion is formed in the lower portion of the light guide plate, the side of the light guide plate is characterized in that the second reflector is further provided.
본 발명의 제2 실시예에 따르면, 백라이트 장치가 제공되는데, 상기 백라이트 장치는, 하나 이상의 광원과, 다수 개의 도광판과, 다수 개 도광판의 하면에 설치된 제1 반사재와, 다수 개 도광판의 상면에 설치된 확산재를 포함하는 백라이트 장치에 있어서, 다수 개의 도광판 중 적어도 하나 이상의 도광판은, 일 측면의 상부에 소정의 형상을 가지는 제1 절단부가 형성되고, 제1 절단부의 상부에 제2 반사재가 설치되며, 제1 절단부가 형성되는 도광판의 측면 끝단에 광원이 배치되고, 다수 개의 도광판 중 적어도 하나 이상의 도광판은, 일 측면의 하부에 소정의 형상을 가지는 제2 절단부가 형성되고, 제1 절단부와 제2 절단부가 접촉되거나 겹쳐져 광원을 커버하도록 다수 개의 도광판을 조합하고, 하나 이상의 광원은 각각 독립적으로 구동됨으로써 로컬디밍 효과를 구현하는 것을 특징으로 한다.According to a second embodiment of the present invention, a backlight device is provided, wherein the backlight device includes at least one light source, a plurality of light guide plates, a first reflector provided on a bottom surface of the plurality of light guide plates, and a top surface of the plurality of light guide plates. In the backlight device including a diffusion material, at least one or more light guide plates of the plurality of light guide plates, the first cut portion having a predetermined shape is formed on the upper side of one side, the second reflector is provided on the first cut portion, A light source is disposed at a side end of the light guide plate on which the first cut part is formed, and at least one or more light guide plates of the plurality of light guide plates have a second cut part having a predetermined shape at a lower portion of one side, and the first cut part and the second cut part. Combine a plurality of light guide plates so that light contacts or overlap to cover the light source, and one or more light sources are driven independently of each other It characterized in that it implements the effect.
바람직하게는, 상기 제1 절단부 또는 상기 제2 절단부는, 직선, 사선, 곡선 또는 계단 형상이거나 이들의 조합으로 된 형상을 가진 것을 특징으로 한다.Preferably, the first cut portion or the second cut portion is characterized in that it has a shape of a straight, oblique, curved or stair shape or a combination thereof.
또한, 상기 제2 반사재는, 수지성의 반사시트, 금속성의 반사판 또는 광반사율이 높은 재료를 도포한 것을 특징으로 한다.In addition, the second reflecting material is characterized by coating a resin reflecting sheet, a metallic reflecting plate, or a material having high light reflectance.
또한, 상기 제2 절단부의 하부에 반사재, 광흡수재 또는 광확산재를 설치한 것을 특징으로 한다.In addition, a reflective material, a light absorbing material or a light diffusing material is provided below the second cut portion.
또한, 상기 제2 절단부는, 도광판 전체 영역에 걸쳐 위치하며, 웨지형(wedge)의 형상을 가지는 것을 특징으로 한다.In addition, the second cut portion is positioned over the entire light guide plate, and has a wedge shape.
또한, 상기 제2 절단부의 하부에 설치되는 반사재는, 제2 반사재와 일체로 된 것을 특징으로 한다.Moreover, the reflecting material provided in the lower part of the said 2nd cutting part is characterized by being integrated with the 2nd reflecting material.
상술한 바와 같이 본 발명에 따르면, 다수 개의 도광판의 측면 또는 하면에 소정형상의 절단부를 형성하고, 형성된 절단부의 하부에 하나 이상의 LED 광원을 배치한 후, 배치된 하나 이상의 LED 광원을 독립적으로 구동함으로써 로컬디밍기능을 구현할 수 있다.According to the present invention as described above, by forming a cut portion of a predetermined shape on the side or the bottom of the plurality of light guide plate, by arranging at least one LED light source under the formed cut portion, by driving one or more LED light sources arranged independently Local dimming can be implemented.
도 1은 종래 백라이트 장치를 도시한 도면이다.1 is a view illustrating a conventional backlight device.
도 2는 본 발명의 제1 실시예에 따른 백라이트 장치를 도시한 측단면도이다.2 is a side sectional view showing a backlight device according to a first embodiment of the present invention.
도 3는 본 발명의 제2 실시예에 따른 백라이트 장치를 도시한 측단면도이다.3 is a side sectional view showing a backlight device according to a second embodiment of the present invention.
도 4는 본 발명의 제3 실시예에 따른 백라이트 장치를 도시한 측단면도이다.4 is a side sectional view showing a backlight device according to a third embodiment of the present invention.
도 5는 본 발명의 제4 실시예에 따른 백라이트 장치를 도시한 측단면도이다.5 is a side sectional view showing a backlight device according to a fourth embodiment of the present invention.
도 6은 본 발명의 제5 실시예에 의한 백라이트 장치를 도시한 측단면도이다.6 is a side sectional view showing a backlight device according to a fifth embodiment of the present invention.
도 7은 본 발명의 제6 실시예에 의한 백라이트 장치를 도시한 측단면도이다.7 is a side sectional view showing a backlight device according to a sixth embodiment of the present invention.
도 8은 본 발명의 따른 제1 절단부의 형상을 도시한 측단면도이다.Figure 8 is a side cross-sectional view showing the shape of the first cut portion according to the present invention.
도 9는 본 발명의 제7 실시예에 의한 백라이트 장치를 도시한 측단면도이다.9 is a side sectional view showing a backlight device according to a seventh embodiment of the present invention.
이하에서는 첨부 도면을 참조하여 본 발명에 따른 백라이트 장치에 대하여 가장 바람직한 실시 예를 상세히 설명하기로 한다. 그러나 본 발명은 이하에서 개시되는 실시예에 한정되는 것이 아니라 서로 다른 다양한 형태로 구현될 수 있으며, 단지 본 실시예는 본 발명의 개시가 완전하도록 하며 통상의 지식을 가진자에게 발명의 범주를 완전하게 알려주기 위해 제공되는 것이다.Hereinafter, a preferred embodiment of a backlight device according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, only the embodiments to complete the disclosure of the present invention and complete the scope of the invention to those skilled in the art. It is provided to inform you.
도 2 내지 도 5는 본 발명의 실시예에 따른 백라이트 장치를 도시한 측단면도로, 도광판의 일측면에 절단부를 형성한 경우를 도시하고 있다.2 to 5 are side cross-sectional views illustrating a backlight device according to an exemplary embodiment of the present invention, which illustrates a case where a cutout is formed on one side of the light guide plate.
도　2 내지 도 5를 참조하면, 백라이트 장치(200)에는 다수 개의 도광판(210)이 마련되어 있다. 도광판(210)의 상면과 하면에는 도광 패턴(210a)이 형성되어 있다.2 to 5, a plurality of light guide plates 210 are provided in the backlight device 200. Light guide patterns 210a are formed on upper and lower surfaces of the light guide plate 210.
각 도광판(210)의 일 측면에는 계단 모양(도 2 및 도 3) 또는 곡선경사면 형상(도 4) 또는 홈형상(도 5)으로 이루어진 절단부(211)가 형성되어 있다. 도광판(210)의 측면에는 하나 이상의 LED 광원(220)이 배치되어 있고, 도광판(210) 측면의 절단부(211)는 상면에서 내려다 보았을 때 LED 광원(220)이 도광판(210) 절단부(211)에 의해 가려지는 구조를 가진다. 본 발명에서 광원은 LED 광원(220)을 예시로 설명하고 있으나, 이에 한정되는 것은 아니며 냉음극 형광 램프 등과 같은 다른 광원도 사용 가능하다.One side of each light guide plate 210 is formed with a cut portion 211 formed in a staircase shape (FIGS. 2 and 3) or a curved slope surface shape (FIG. 4) or a groove shape (FIG. 5). At least one LED light source 220 is disposed on a side surface of the light guide plate 210, and the cut portion 211 of the side surface of the light guide plate 210 is viewed from an upper surface thereof so that the LED light source 220 is connected to the cut portion 211 of the light guide plate 210. Has a structure that is obscured by In the present invention, the light source is described as an example of the LED light source 220, but is not limited thereto, and other light sources such as a cold cathode fluorescent lamp may be used.
또한, 도광판(210)의 하부에는 도광판(210) 하면으로 나온 빛을 상부로 반사시킬 수 있는 제1 반사재(230)가 설치되어 있다. 도광판(210)의 상부에는 빛을 산란 및 확산시키는 확산재(240)가 설치되어 있다. 확산재(240)의 상부에는 빛을 집광하여 주는 프리즘(250)이 설치되어 있다.In addition, a first reflector 230 may be disposed below the light guide plate 210 to reflect light emitted from the lower surface of the light guide plate 210 upward. A diffuser 240 for scattering and diffusing light is provided on the light guide plate 210. The prism 250 for condensing light is provided on the diffusion material 240.
다수 개의 도광판(210) 각각의 측면 절단부(211)의 하부에 설치된 LED 광원(220)에서 출광된 빛은 도광판(210) 내로 입사되고 도광판(210) 각 구획 내로 입사된 빛은 전반사 효과에 의해 도광판(210) 내부를 도광하여 이동한다. 도광된 광 중 도광 패턴(210a)에 닿은 빛은 전반사 임계각을 초과하는 입사각에 의해 도광판(210) 외부로 출사된다. 이 때 도광판(210) 하부로 출사된 빛은 제1 반사재(230)를 거쳐 반사되고, 다시 도광판(210)을 통과한 후 도광판(210) 상면의 확산재(240)를 통과하고 다시 프리즘(250)를 통과하여 전면으로 출사되는 원리를 가진다.Light emitted from the LED light source 220 installed under the side cutouts 211 of each of the plurality of light guide plates 210 is incident into the light guide plate 210 and the light incident into each compartment of the light guide plate 210 is reflected by the total reflection effect. (210) The light guides inside. Among the light guided, the light reaching the light guide pattern 210a is emitted to the outside of the light guide plate 210 by an incident angle exceeding the total reflection threshold angle. At this time, the light emitted from the lower portion of the light guide plate 210 is reflected through the first reflector 230, passes through the light guide plate 210 again, passes through the diffuser 240 on the upper surface of the light guide plate 210, and again prism 250. Pass through) and exit to the front.
이때 도광 패턴(210a)은 각각의 도광판(210) 구획 내에서 광원에서 나온 빛이 상대적으로 많이 도달하는 부위는 밀도가 낮게, 상대적으로 적게 도달하는 부위는 밀도가 높게 배치되어 균일한 면광원을 이루도록 하며, 하나 이상의 LED 광원(220)을 적절하게 분리한 후 차등하여 디밍함으로써 각각의 구획 밝기를 다른 구획과 차등되게 조절되도록 한다. 예를 들면, 하나의 도광판(210)내에서 차등 조절하거나 또는 도광판(210) 단위로 차등 조절이 가능하다. 이 때 LED 광원(220)은 다수 개의 LED 조합으로 분할구동이 가능하며 하나의 기판에 여러 개의 LED 광원(220)을 모듈로 집적하여 사용할 수 있다. LED 광원(220)은 도 2 및 도 4와 같이 절단부(211)의 반대방향을 향하거나 또는 도 3 및 도 5과 같이 절단부(211)를 향하는 방향으로 설치될 수 있다.In this case, the light guide pattern 210a has a low density at a portion where a relatively large amount of light from the light source reaches within each compartment of the light guide plate 210 so as to have a high density and a uniform surface light source. Then, by dividing the at least one LED light source 220 appropriately and differentially dimming so that the brightness of each compartment is differentially adjusted to the other compartment. For example, differential control may be performed in one light guide plate 210 or may be differentially controlled in units of the light guide plate 210. In this case, the LED light source 220 may be divided and driven by a plurality of LED combinations, and a plurality of LED light sources 220 may be integrated and used on a single substrate. The LED light source 220 may be installed in a direction opposite to the cutout 211 as shown in FIGS. 2 and 4 or toward the cutout 211 as shown in FIGS. 3 and 5.
한편, 이하에서 도 2 내지 도 5의 도광판(210)의 절단부(211)의 형상에 대하여 상세하게 설명하기로 한다.Meanwhile, the shape of the cutout 211 of the light guide plate 210 of FIGS. 2 to 5 will be described in detail below.
본 발명에 따른 도광판(210)의 절단부(211)의 형상은 도 2 내지 도 3에서 도시된 바와 같이 계단형상의 절단부(211)이거나 또는 도 4에서 도시된 바와 같이 소정의 곡률을 가지는 곡선형상의 절단부(211)일 수 있다. 절단부(211)의 좌우방향의 길이(L)는 LED 광원(220)의 두께(D)보다 크게 형성함으로써, 상면에서 내려다 보았을 때 LED 광원(220)이 도광판(210) 절단부(211)에 의해 가려지도록 할 수 있다.The shape of the cutout portion 211 of the light guide plate 210 according to the present invention is a stepped cutout portion 211 as shown in Figs. 2 to 3 or a curved shape having a predetermined curvature as shown in Fig. 4. It may be a cut portion 211. The length L in the left and right directions of the cut portion 211 is greater than the thickness D of the LED light source 220, so that the LED light source 220 is covered by the cut portion 211 of the light guide plate 210 when viewed from the top. Can be lost.
또한, 본 발명에 따른 절단부(211)의 형상은 도 5에서 도시된 바와 같은 홈 모양일 수 있다. 즉, 도광판(210)의 하면에 절단부(211)를 홈모양으로 형성하고, 형성된 홈 내에 LED 광원(220)을 배치하도록 되어 있다. 이 경우 도광판(210)의 측면에는 제2 반사재(500)가 추가로 설치될 수 있다. 따라서, LED 광원(220)에서 나온 빛은 도광판(210)의 내부를 도광하여 이동하며, 도광판(210) 내부로 이동된 빛은 도광판(210) 측면의 제2 반사재(500)에 반사되어 확산재(240)를 통과한다. 비록 도 5에서 도시되어 있지 않으나, 확산재(240) 위에는 프리즘(250)을 추가로 설치할 수 있다. 한편, 절단부(211)는 NC 직가공, 사출 성형, 압출 성형 등 여러가지 공법에 의해 제조가능하다.In addition, the shape of the cut portion 211 according to the present invention may be a groove shape as shown in FIG. That is, the cutting part 211 is formed in the groove shape on the lower surface of the light guide plate 210, and the LED light source 220 is arrange | positioned in the formed groove. In this case, the second reflector 500 may be additionally installed on the side surface of the light guide plate 210. Therefore, the light emitted from the LED light source 220 guides and moves inside the light guide plate 210, and the light moved into the light guide plate 210 is reflected by the second reflector 500 on the side of the light guide plate 210 to diffuse. Pass 240. Although not shown in FIG. 5, the prism 250 may be additionally installed on the diffusion material 240. On the other hand, the cut portion 211 can be manufactured by various methods such as NC direct machining, injection molding, extrusion molding.
한편, 도 6 내지 도 7은 본 발명의 다른 실시예에 따른 백라이트 장치를 도시한 측단면도이며, 도 8은 본 발명의 따른 제1 절단부의 형상을 도시한 측단면도이다. 도 2 내지 도 5와 달리, 도광판(210)의 양측면에 모두 절단부를 형성한 경우를 도시하고 있다.6 to 7 are side cross-sectional views illustrating a backlight device according to another exemplary embodiment of the present invention, and FIG. 8 is a side cross-sectional view showing the shape of a first cutout portion according to the present invention. 2 to 5, the cutting parts are formed on both side surfaces of the light guide plate 210.
도 6 내지 도 7에서 제2 절단부(213)의 길이(L)는 LED 광원(220)의 두께(D)보다 크게 형성되어 상면에서 내려다보았을 때 LED 광원(220)이 제2 절단부(213)에 의해 가려지는 구조를 갖는다.6 to 7, the length L of the second cutout 213 is greater than the thickness D of the LED light source 220, and when viewed from the top, the LED light source 220 is connected to the second cutout 213. It has a structure that is covered by.
우선 도 6를 참조하면, 백라이트 장치(200)에는 다수 개의 도광판(210)이 마련되어 있다. 도광판(210)의 상면과 하면에는 도광 패턴(210a)이 형성되어 있다. 각 도광판(210)의 일측면 상면에는 계단 모양으로 이루어진 제1 절단부(212)가 형성되어 있다. 제1 절단부(212)가 형성된 도광판(210) 측면 끝단에는 하나 이상의 LED 광원(220)이 배치되어 있다. 또한 각 도광판(210)의 타측면 하면에는 곡면형상의 제2 절단부(213)가 형성되어 있다. 도광판(210)이 다수 개 연결되면 일측면의 상부에 설치된 제1 절단부(212)와 다음 도광판(210)의 타측면 하부에 설치된 제2 절단부(213)가 서로 부분 결합하여, 백라이트 장치(200)를 상면에서 내려다 보았을 때 LED 광원(220)이 제2 절단부(213)에 의해 가려지는 구조를 가진다.First, referring to FIG. 6, a plurality of light guide plates 210 are provided in the backlight device 200. Light guide patterns 210a are formed on upper and lower surfaces of the light guide plate 210. On the upper surface of one side of each light guide plate 210, a first cutout portion 212 having a step shape is formed. At least one LED light source 220 is disposed at a side end of the light guide plate 210 on which the first cutout 212 is formed. In addition, a curved second cut portion 213 is formed on the lower surface of the other light guide plate 210. When a plurality of light guide plates 210 are connected, the first cutout portion 212 installed at an upper portion of one side surface and the second cutout portion 213 provided at a lower portion of the other side surface of the next light guide plate 210 are partially coupled to each other, so that the backlight device 200 When looking down from the top surface has a structure that the LED light source 220 is covered by the second cut portion (213).
도광판(210)의 하부에는 도광판(210) 하면으로 나온 빛을 상부로 반사시킬 수 있는 제1 반사재(230)가 설치되어 있다. 일측면 상부에 설치된 제1 절단부(212)에는 제2 반사재(212a)가 설치되어 있다. 도광판(210)의 상부에는 빛을 산란 및 확산시키는 확산재(240)가 설치되어 있다. 확산재(240)의 상부에는 빛을 집광하여 주는 프리즘(250)이 설치되어 있다.The first reflector 230 is disposed under the light guide plate 210 to reflect light emitted from the lower surface of the light guide plate 210 upward. The second reflecting member 212a is provided at the first cut portion 212 provided at the upper side of one side. A diffuser 240 for scattering and diffusing light is provided on the light guide plate 210. The prism 250 for condensing light is provided on the diffusion material 240.
제2 반사재(212a)는 수지성의 반사시트, 금속성의 반사판 또는 광반사율이 높은 재료를 도포함으로써 설치할 수 있다. 한편, 도광판(210)의 타측면 하부에 설치된 제2 절단부(213)에는 반사재, 광흡수재 또는 광확산재(240)가 설치될 수 있다. 그리고, 제2 절단부(213)에 반사재가 설치되는 경우 제2 반사재(212a)와 일체로 설치할 수도 있다.The second reflector 212a can be provided by applying a resin reflective sheet, a metallic reflector or a material having high light reflectance. On the other hand, the second cut portion 213 is provided on the lower side of the other side of the light guide plate 210 may be provided with a reflector, light absorbing material or light diffusing material 240. In addition, when the reflective material is installed in the second cutout 213, the reflective material may be integrally provided with the second reflective material 212a.
다수 개의 도광판(210)의 제1 절단부(212)를 가지는 측면에 각각 설치된 LED 광원(220)에서 출광된 빛은 도광판(210) 내로 입사되고 도광판(210) 각 구획 내로 입사된 빛은 전반사 효과에 의해 도광판(210) 내부를 도광하여 이동한다. 이 때 제1 절단부(212)로 입사된 빛은 제2 반사재(212a)에 의해 반사되어 도광판(210) 내부로 도광된다. 또한 도광판(210)을 도광하여 제2 절단부(213)로 입사된 빛은 전반사되거나 도광판(210) 외부로 빠져나가게 되는데 이 때 제2 절단부(213)에 반사재, 광흡수재 또는 광확산재(213a)가 설치된 경우 반사재, 광흡수재 또는 광확산재에 의해 광이 반사, 흡수 되거나 확산하여, 주변 대비 밝게 외관상 드러나지 않게 할 수 있다.Light emitted from the LED light source 220 installed on each side having the first cutouts 212 of the plurality of light guide plates 210 is incident into the light guide plate 210 and the light incident into each compartment of the light guide plate 210 is affected by the total reflection effect. The light guide plate 210 is guided and moved inside. At this time, the light incident on the first cutout 212 is reflected by the second reflector 212a and guided into the light guide plate 210. In addition, the light guided to the light guide plate 210 and incident to the second cutout 213 is totally reflected or exits to the outside of the light guide plate 210. At this time, the second cutout 213 is a reflector, a light absorbing material, or a light diffuser 213a. When is installed, the light is reflected, absorbed or diffused by the reflector, light absorber or light diffuser, so that the appearance can be brighter than the surroundings.
도광된 광 중 도광 패턴에 닿은 빛은 전반사 임계각을 초과하는 입사각에 의해 도광판(210) 외부로 출사된다. 이 때 도광판(210) 하부로 출사된 빛은 제1 반사재(230)에 의해 반사되고 다시 도광판(210)을 통과한 후 도광판(210) 상면의 확산재(240)를 통과하고 다시 프리즘(250)를 통과하여 전면으로 출사되는 원리를 가진다. 이때 도광 패턴(210a)은 각각의 도광판(210) 구획 내에서 광원에서 나온 빛이 상대적으로 많이 도달하는 부위는 밀도가 낮게, 상대적으로 적게 도달하는 부위는 밀도가 높게 배치되며 필요한 경우 절단부(213, 212)에도 배치될 수 있다. 이러한 방법으로 균일한 면광원을 이루도록 하며, 하나 이상의 LED 광원(220)을 적절하게 분리한 후 차등하여 디밍함으로써 각각의 구획 밝기를 다른 구획과 차등되게 조절되도록 한다. 예를 들면, 하나의 도광판(210)내에서 차등 조절하거나 또는 도광판(210) 단위로 차등 조절이 가능하다. 이 때 LED 광원(220)은 다수 개의 LED 조합으로 분할구동이 가능하며 하나의 기판에 여러 개의 LED 광원(220)을 모듈로 집적하여 사용할 수 있다. 이로서 도광판(210)을 사용하는 에지라이트 백라이트 장치에서 로컬디밍을 손쉽게 이루게 된다.Among the light guided, the light reaching the light guide pattern is emitted to the outside of the light guide plate 210 by an incident angle exceeding the total reflection threshold angle. At this time, the light emitted from the lower portion of the light guide plate 210 is reflected by the first reflector 230, passes through the light guide plate 210 again, passes through the diffuser 240 on the upper surface of the light guide plate 210, and again prism 250. Pass through and exit to the front. In this case, the light guide pattern 210a has a low density at a portion where a large amount of light from the light source arrives within each compartment of the light guide plate 210 and a high density at a portion where a relatively small amount of light arrives. 212). In this way, a uniform surface light source is achieved, and one or more LED light sources 220 are properly separated, and then dimmed by differentially so that the brightness of each compartment is differentially controlled from the other compartments. For example, differential control may be performed in one light guide plate 210 or may be differentially controlled in units of the light guide plate 210. In this case, the LED light source 220 may be divided and driven by a plurality of LED combinations, and a plurality of LED light sources 220 may be integrated and used on a single substrate. As a result, local dimming is easily performed in the edge light backlight device using the light guide plate 210.
다음으로, 도 7을 참조하면, 제1 절단부(212)는 일측면의 상부가 직선인 형상이며, 제2 절단부(213)의 일측면 전체가 직선인 형상을 도시하고 있다. 그리고, 제1 절단부(212)의 상면에는 제2 반사재(212a)가 설치되어 측면 끝단에 설치된 LED 광원(220)에서 나온 강한 발광이 전면으로 바로 빠져나오지 않도록 하는 것이 가능하다. 또한, 제2 절단부(213)의 하면에는 반사재, 광흡수재 또는 광확산재(213a)를 설치할 수 있으며 제2 절단부(213)에서 발생하는 강한 발광을 제어할 수 있게 된다.Next, referring to FIG. 7, the first cut part 212 has a shape in which the top of one side is a straight line, and the entire shape of one side of the second cut part 213 is a straight line. In addition, a second reflector 212a may be installed on the upper surface of the first cutout 212 so that the strong light emitted from the LED light source 220 installed at the side end does not immediately exit to the front surface. In addition, a reflecting material, a light absorbing material, or a light diffusing material 213a may be provided on the lower surface of the second cutting part 213, and the strong light emission generated in the second cutting part 213 may be controlled.
제1 절단부(212)의 형상은, 도 6의 경우 계단 형상을, 도 7의 경우 도광판(210)의 측면의 상부만이 경사를 가진 형상을 도시하고 있다. 특히, 제1 절단부(212)의 형상은, 도 8(a)에 도시된 바와 같이 도광판(210)의 측면의 상부만이 경사를 가지며, 각도 θ가 90도 이상이거나, (b)와 같이 곡률을 갖는 곡선 형상의 경사면이 가능하다. 또한, 직선, 사선, 곡선 등 다양한 형상 및 이들의 조합된 형상도 가능하다. 이러한 절단부의 형성은 NC 직가공, 사출 성형, 압출 성형 등 여러가지 공법이 가능하다.In the case of FIG. 6, the shape of the first cut part 212 has a step shape, and in FIG. 7, only an upper portion of the side surface of the light guide plate 210 has an inclination. In particular, the shape of the first cut portion 212, the upper portion of the side of the light guide plate 210 as shown in Figure 8 (a) has an inclination, the angle θ is 90 degrees or more, or (b) curvature It is possible to have a curved slope having a shape. In addition, various shapes such as a straight line, an oblique line, a curved line, and a combination thereof are possible. Formation of such cuts can be various methods such as NC direct machining, injection molding, extrusion molding.
한편, 도 9는 본 발명의 제7 실시예에 의한 백라이트 장치를 도시한 측단면도이다.9 is a side sectional view showing a backlight device according to a seventh embodiment of the present invention.
도 9를 참조하면, 제1 절단부(212)는 일측면의 상부가 직선인 형상이며, 제2 절단부(213)가 도광판(210) 전체에 걸쳐 위치하여 웨지형(wedge)의 도광판(210) 형상을 가지는 구조를 도시하고 있다. 그리고, 제1 절단부(212)의 상면에는 제2 반사재(212a)가 설치되어 있다. 이러한 웨지형의 도광판(210)을 사용하면, 도광판(210) 내에서 도광되는 빛이 대부분 도광패턴(210a)에 의해 방출되므로 제2 절단부(213) 끝단에서 발생하는 강한 발광을 제어할 수 있게 된다. 이러한 절단부의 형성은 NC 직가공, 사출 성형, 압출 성형 등 여러가지 공법이 가능하다.Referring to FIG. 9, the first cutout portion 212 has a straight top shape on one side thereof, and the second cutout portion 213 is positioned over the entire light guide plate 210 to form a wedge shaped light guide plate 210. It shows a structure having a. And the 2nd reflector 212a is provided in the upper surface of the 1st cut part 212. FIG. When the wedge-shaped light guide plate 210 is used, since most of the light guided in the light guide plate 210 is emitted by the light guide pattern 210a, the strong light emission generated at the end of the second cutout 213 can be controlled. . Formation of such cuts can be various methods such as NC direct machining, injection molding, extrusion molding.
본 발명은 도면에 도시된 일 실시예를 참고로 설명되었으나 이는 예시적인 것에 불과하며, 본 기술 분야의 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 타 실시예가 가능하다는 점을 이해할 것이다. 따라서, 본 발명의 진정한 기술적 보호범위는 첨부된 등록청구범위의 기술적 사상에 의해 정해져야 할 것이다. Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (9)

  1. 다수 개의 도광판과, 상기 도광판의 측면 또는 하면에 형성된 절단부와, 상기 도광판의 측면 또는 하면에 설치된 하나 이상의 광원과, 상기 도광판의 하면에 설치된 제1 반사재와, 상기 도광판의 상면에 설치된 확산재를 포함하는 백라이트 장치에 있어서,A plurality of light guide plates, cut portions formed on side or bottom surfaces of the light guide plate, one or more light sources provided on side or bottom surfaces of the light guide plate, a first reflector provided on a bottom surface of the light guide plate, and a diffusion material provided on an upper surface of the light guide plate In the backlight device,
    상기 절단부의 하부에 상기 하나 이상의 광원을 배치함으로써 상기 절단부에 의해 상기 광원이 가려지도록 구성되며,Arranged to cover the light source by the cutting part by placing the at least one light source under the cutting part,
    상기 하나 이상의 광원을 각각 독립적으로 구동함으로써 로컬디밍 효과를 구현하는 것을 특징으로 하는 백라이트 장치.And driving the one or more light sources independently to implement a local dimming effect.
  2. 제1항에 있어서,The method of claim 1,
    상기 절단부의 형상은, 계단 형상 또는 곡선 경사면 형상 또는 홈 형상인 것을 특징으로 하는 백라이트 장치.The shape of the cut portion is a step shape, curved inclined plane shape or groove shape, characterized in that the backlight device.
  3. 제1항에 있어서,The method of claim 1,
    상기 절단부가 상기 도광판의 하부에 형성되는 경우, 상기 도광판의 측면에는 제2 반사재가 추가로 설치되는 것을 특징으로 하는 백라이트 장치.When the cut portion is formed in the lower portion of the light guide plate, the backlight device, characterized in that the second reflector is further provided on the side of the light guide plate.
  4. 하나 이상의 광원과, 다수 개의 도광판과, 상기 다수 개 도광판의 하면에 설치된 제1 반사재와, 상기 다수 개 도광판의 상면에 설치된 확산재를 포함하는 백라이트 장치에 있어서,A backlight device comprising at least one light source, a plurality of light guide plates, a first reflector provided on a lower surface of the plurality of light guide plates, and a diffuser provided on an upper surface of the plurality of light guide plates,
    상기 다수 개의 도광판 중 적어도 하나 이상의 도광판은, 일 측면의 상부에 소정의 형상을 가지는 제1 절단부가 형성되고,At least one or more light guide plates of the plurality of light guide plates may include a first cutout part having a predetermined shape at an upper portion of one side surface thereof,
    상기 제1 절단부의 상부에 제2 반사재가 설치되며,A second reflector is installed on the first cut portion,
    상기 제1 절단부가 형성되는 도광판의 측면 끝단에 상기 광원이 배치되고,The light source is disposed at a side end of the light guide plate on which the first cut portion is formed,
    상기 다수 개의 도광판 중 적어도 하나 이상의 도광판은, 일 측면의 하부에 소정의 형상을 가지는 제2 절단부가 형성되고,At least one or more light guide plates of the plurality of light guide plates may include a second cut portion having a predetermined shape at a lower portion of one side surface thereof,
    상기 제1 절단부와 상기 제2 절단부가 접촉되거나 겹쳐져 상기 광원을 커버하도록 상기 다수 개의 도광판을 조합하고,Combining the plurality of light guide plates such that the first cut portion and the second cut portion contact or overlap to cover the light source,
    상기 하나 이상의 광원은 각각 독립적으로 구동됨으로써 로컬디밍 효과를 구현하는 것을 특징으로 하는 백라이트 장치.The one or more light sources are driven independently of each other to implement a local dimming effect.
  5. 제4항에 있어서,The method of claim 4, wherein
    상기 제1 절단부 또는 상기 제2 절단부는, 직선, 사선, 곡선 또는 계단 형상이거나 이들의 조합으로 된 형상을 가진 것을 특징으로 하는 백라이트 장치.And the first cutout portion or the second cutout portion has a shape of a straight line, an oblique line, a curved line, a staircase, or a combination thereof.
  6. 제4항에 있어서,The method of claim 4, wherein
    상기 제2 반사재는, 수지성의 반사시트, 금속성의 반사판 또는 광반사율이 높은 재료를 도포한 것을 특징으로 하는 백라이트 장치.The second reflecting material is coated with a resin reflective sheet, a metallic reflector or a material having high light reflectance.
  7. 제4항에 있어서,The method of claim 4, wherein
    상기 제2 절단부의 하부에 반사재, 광흡수재 또는 광확산재를 설치한 것을 특징으로 하는 백라이트 장치.And a reflecting member, a light absorbing member, or a light diffusing member is disposed below the second cutting portion.
  8. 제4항에 있어서,The method of claim 4, wherein
    상기 제2 절단부는, 상기 도광판 전체 영역에 걸쳐 위치하며, 웨지형(wedge)의 형상을 가지는 것을 특징으로 하는 백라이트 장치.And the second cut portion is positioned over the entire light guide plate and has a wedge shape.
  9. 제7항에 있어서,The method of claim 7, wherein
    상기 제2 절단부의 하부에 설치되는 반사재는, 상기 제2 반사재와 일체로 된 것을 특징으로 하는 백라이트 장치.A reflector provided below the second cutout is integral with the second reflector.
PCT/KR2009/005167 2009-09-11 2009-09-11 Local dimming backlight apparatus WO2011030941A1 (en)

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