WO2010110497A1 - Backlight device with localised dimming function - Google Patents

Backlight device with localised dimming function Download PDF

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Publication number
WO2010110497A1
WO2010110497A1 PCT/KR2009/001481 KR2009001481W WO2010110497A1 WO 2010110497 A1 WO2010110497 A1 WO 2010110497A1 KR 2009001481 W KR2009001481 W KR 2009001481W WO 2010110497 A1 WO2010110497 A1 WO 2010110497A1
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WO
WIPO (PCT)
Prior art keywords
light guide
guide plate
light
backlight device
dimming function
Prior art date
Application number
PCT/KR2009/001481
Other languages
French (fr)
Korean (ko)
Inventor
배재남
Original Assignee
Bae Jae Nam
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 Bae Jae Nam filed Critical Bae Jae Nam
Priority to PCT/KR2009/001481 priority Critical patent/WO2010110497A1/en
Priority to CN2009801582878A priority patent/CN102362216A/en
Priority to KR1020117021814A priority patent/KR20120139525A/en
Priority to PCT/KR2009/003155 priority patent/WO2010110507A1/en
Publication of WO2010110497A1 publication Critical patent/WO2010110497A1/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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • 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
    • 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
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • 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
    • 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
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • 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
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • 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
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays

Definitions

  • the present invention relates to a backlight device, and more particularly, by forming one or more grooves in a light guide plate, separating the light guide plate into a plurality of compartments and arranging a light source in each of the separated plurality of compartments, thereby controlling brightness of only a desired area.
  • the present invention relates to a backlight device having a local dimming function.
  • 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 surface light source device used for lighting. have.
  • FIG. 1 is a cross-sectional view schematically showing a conventional surface light source device.
  • the conventional surface light source 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, It includes a cover member 14 for covering the light source (13).
  • a cold cathode fluorescent lamp or an LED may be used as the light source 13 .
  • the light guide plate 11 is provided with a plurality of light guide patterns 15 for uniformly guiding light incident into the light guide plate.
  • the surface light source 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 is shown. After reaching the outside of the light guide plate 11 and exiting from the light guide plate 11, the light exits the reflective sheet 12 or immediately exits to the upper surface and passes through the upper diffusion sheet 16 and the prism sheet 17. By (15), it has a relatively uniform illuminance and reflects at each site.
  • the light guide plate 13 is provided on the side surface of the light guide plate 11 of the conventional surface light source device 10. In order to obtain a local dimming function, a method of dividing the light source 13 into a plurality of light sources 13 may be considered.
  • the present invention has been made to solve the above problems, and an object of the present invention is to provide a backlight device having a local dimming function capable of controlling the brightness of only a desired area of the light guide plate.
  • another object of the present invention is to provide a backlight device having a local dimming function that can easily implement a local dimming function by blocking the movement of light between each compartment.
  • a backlight device having a local dimming function is a backlight device, a light guide plate, at least one light source provided on the side of the light guide plate, and a reflection provided on the lower surface of the light guide plate A sheet, a diffusion sheet provided on an upper surface of the light guide plate, and a prism sheet provided on an upper surface of the light guide plate, and having a plurality of grooves for separating the light guide plate into a plurality of compartments on one surface of the light guide plate, and at least one light source corresponds to the plurality of compartments. Characterized in that separated configuration.
  • a plurality of grooves are provided with a reflecting material or a light shielding material, and the depth D of the plurality of grooves is characterized by being made in a range of 30% or more of the thickness T of the light guide plate.
  • the light guide plate is divided into a plurality of compartments, and a light source is disposed in each of the separated plurality of compartments, thereby controlling brightness of only a desired region.
  • FIG. 1 is a cross-sectional view schematically showing a conventional surface light source device.
  • FIG. 2 is an exploded perspective view showing a surface light source device according to an embodiment of the present invention.
  • 3A to 3C illustrate various embodiments of grooves formed on one surface of the light guide plate according to the present invention.
  • FIG. 4 is a diagram illustrating a relationship between a depth D of a groove formed on a surface of the light guide plate and a thickness T of the light guide plate according to the exemplary embodiment of the present invention.
  • FIG. 2 is an exploded perspective view showing a surface light source device according to an embodiment of the present invention.
  • the light guide plate 210 is provided in the surface light source device 200.
  • the light guide pattern 220 is formed on the bottom surface of the light guide plate 210.
  • a plurality of grooves 230 are formed on one surface of the light guide plate 210 to divide the light guide plate 210 into a plurality of compartments.
  • the lower portion of the light guide plate 210 is provided with a reflective sheet 240 for reflecting the incident light to the top.
  • a plurality of light sources 270 for scanning light into each section of the light guide plate 210 are separately provided on the sidewall of the light guide plate 210.
  • the light guide plate 210 is further provided with a diffusion sheet 250 for scattering and diffusing light and a prism sheet 260 for adjusting the direction of light.
  • the light emitted from the light source 270 separately installed on the side surfaces of each of the light guide plates 210 is incident on the side surfaces of each of the light guide plates 210, and the light incident into each of the light guide plates 210 is reflected by the total reflection effect.
  • Light guide and move inside Among the light guided, the light reaching the light guide pattern 220 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 light guide pattern 220 is reflected through the reflective sheet 240, passes through the light guide plate 210 again, passes through the diffusion sheet 230 on the upper surface of the light guide plate, and enters the prism sheet 260. It becomes the high brightness light which has high directionality through 260.
  • the light guide pattern 220 has a low density at a portion close to the light source 270 in each compartment of the light guide plate 210 and a high density at a portion far from the light source 270 to form a uniform surface light source.
  • each compartment may be adjusted to be different from the other compartment.
  • a plurality of grooves 230 may be provided with a light shielding material or a reflecting material to block the movement of light between each compartment. As a result, local dimming is easily performed in the edge light backlight device using the light guide plate 210.
  • FIGS. 3A to 3C illustrate various embodiments of grooves formed on one surface of the light guide plate according to the present invention
  • FIG. 4 illustrates grooves formed on the surface of the light guide plate according to one embodiment of the present invention. Is a diagram showing the relationship between the depth D and the thickness T of the light guide plate.
  • one surface of the light guide plate 210 is provided for separating the light guide plate 210 so that light incident from the plurality of light sources 270 can be used only in a desired compartment.
  • a plurality of grooves 230 are formed over the entire area of the light guide plate 210.
  • the groove 230 is formed to have a constant depth according to the minimum size of the section to control the brightness. The relationship between the depth D of the groove and the thickness T of the light guide plate is shown in FIG. 4.
  • the depth D of the groove 230 is preferably in the range of 30% or more and up to 100% of the thickness T of the light guide plate 210, because the depth D of the groove 230 is This is because when D) is 30% or less of the thickness T of the light guide plate 210, the light blocking effect is insignificant and sufficient contrast cannot be obtained.
  • the groove 230 may be formed by various methods such as NC direct processing, laser processing, heat press processing, injection molding. On the other hand, by additionally installing a reflector or a light shielding material in the groove 230, it is possible to easily implement the local dimming function by blocking the movement of light between each compartment.

Abstract

Disclosed is a backlight device having localised dimming function. According to the present invention, the backlight device comprises a light guide panel; at least one light source, which is arranged on one lateral end of the light guide panel; a reflection sheet, which is arranged below the light guide panel; a diffusion sheet which is placed on the upper surface of the light guide panel; a prism sheet which is located on the upper surface of the diffusion sheet; and a plurality of teeth formed on one side of the surface of the light guide panel which divides the light guide panel into a plurality of parts to which at least one light source corresponds. This backlight device therefore enables localised dimming function which can control the brightness of the illumination on specific locations.

Description

로컬 디밍 기능을 가지는 백라이트 장치Backlight device with local dimming
본 발명은 백라이트 장치에 관한 것으로, 더욱 상세하게는 도광판에 하나 이상의 홈을 형성시킴으로써, 도광판을 다수개의 구획으로 분리하고, 분리된 다수개의 구획 각각에 광원을 배치시킴으로써, 원하는 영역만의 밝기 제어를 할 수 있는 로컬디밍기능을 가지는 백라이트 장치에 관한 것이다.The present invention relates to a backlight device, and more particularly, by forming one or more grooves in a light guide plate, separating the light guide plate into a plurality of compartments and arranging a light source in each of the separated plurality of compartments, thereby controlling brightness of only a desired area. The present invention relates to a backlight device having a local dimming function.
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 면광원 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 surface light source device used for lighting. have.
도광판을 사용한 면광원 장치로는 냉음극 형광 램프(cold cathode fluorescent lamp, CCFL) 또는 LED를 배치하는 방식이 널리 사용되고 있다. 이러한 면광원 장치는 한국특허 출원번호 제1994-33115호, 제2001-25870호, 제2001-53844호 등에 개시되어 있다.As a surface light source device using a light guide plate, a method of disposing a cold cathode fluorescent lamp (CCFL) or an LED is widely used. Such a surface light source device is disclosed in Korean Patent Application Nos. 195-33115, 2001-25870, 2001-53844, and the like.
도 1은 종래의 면광원 장치를 개략적으로 도시한 단면도이다.1 is a cross-sectional view schematically showing a conventional surface light source device.
도 1을 참조하면, 종래의 면광원 장치(10)는 도광판(11)과, 도광판(11)의 하부에 설치된 반사시트(12)와, 도광판(11)의 측벽에 설치된 광원(13)과, 광원(13)을 커버하는 커버부재(14)를 포함한다. 광원(13)으로는 냉음극 형광 램프 또는 LED 등이 사용될 수 있다. 한편, 도광판(11)에는 도광판 내로 입사된 빛을 균일하게 도광시켜 주기 위한 다수의 도광패턴(15)이 형성되어 있다.Referring to FIG. 1, the conventional surface light source 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, It includes a cover member 14 for covering the light source (13). 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 15 for uniformly guiding light incident into the light guide plate.
상기와 같이 구성된 면광원 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(15)에 닿아서 도광판(11)의 외부로 빠져 나간 후 반사시트(12)에 부딪히거나 상면으로 바로 빠져나가서 상면의 확산시트(16)와 프리즘 시트(17)를 통과하게 되며, 도광패턴(15)에 의하여 각 부위에서 비교적 균일한 조도를 가지며 반사하게 된다. 이와 같은 종래의 면광원 장치(10)의 도광판(11) 측면에는 광원(13)이 설치되어 있으며, 로컬디밍기능을 얻기 위해서는 광원(13)을 다수 개로 세분화 하여 설치하는 방법을 고려할 수 있다. 하지만, 이와 같은 방법은 도광판(11)이 일체로 되어 있어 다수 개로 세분화한 광원(13)을 사용하여 밝기를 조절한다고 하더라도 LED 에서 출사된 광이 일정이상의 방사각을 가진채 퍼지게 되므로 원하는 영역만의 밝기 제어가 불가능하게 된다는 문제점이 있다.In the surface light source 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 is shown. After reaching the outside of the light guide plate 11 and exiting from the light guide plate 11, the light exits the reflective sheet 12 or immediately exits to the upper surface and passes through the upper diffusion sheet 16 and the prism sheet 17. By (15), it has a relatively uniform illuminance and reflects at each site. The light guide plate 13 is provided on the side surface of the light guide plate 11 of the conventional surface light source device 10. In order to obtain a local dimming function, a method of dividing the light source 13 into a plurality of light sources 13 may be considered. However, in such a method, since the light guide plate 11 is integrated, even if the brightness is adjusted using a plurality of light sources 13 subdivided into pieces, the light emitted from the LED is spread with a certain radiation angle. There is a problem that the brightness control becomes impossible.
본 발명은 상기와 같은 문제점을 해결하기 위한 것으로서, 본 발명의 목적은, 도광판의 원하는 영역만의 밝기를 제어할 수 있는 로컬디밍기능을 가지는 백라이트 장치를 제공하는 것을 목적으로 한다.The present invention has been made to solve the above problems, and an object of the present invention is to provide a backlight device having a local dimming function capable of controlling the brightness of only a desired area of the light guide plate.
또한, 본 발명의 다른 목적은, 각 구획간 빛의 이동을 차단하여 로컬디밍기능을 손쉽게 구현할 수 있는 로컬디밍기능을 가지는 백라이트 장치를 제공하는 것을 목적으로 한다.In addition, another object of the present invention is to provide a backlight device having a local dimming function that can easily implement a local dimming function by blocking the movement of light between each compartment.
상기 목적으로 달성하기 위하여 본 발명의 실시예에 따르면, 본 발명에 따른 로컬디밍기능을 가지는 백라이트 장치는 백라이트 장치에 있어서, 도광판과, 도광판의 측면에 설치된 하나 이상의 광원과, 도광판의 하면에 설치된 반사시트와, 도광판의 상면에 설치된 확산시트와, 확산시트 상면에 설치된 프리즘 시트를 포함하며, 도광판의 일면에 도광판을 다수 개의 구획으로 분리하는 다수 개의 홈을 가지고, 하나 이상의 광원이 다수 개의 구획에 대응되도록 분리 구성된 것을 특징으로 한다.According to an embodiment of the present invention for achieving the above object, a backlight device having a local dimming function according to the present invention is a backlight device, a light guide plate, at least one light source provided on the side of the light guide plate, and a reflection provided on the lower surface of the light guide plate A sheet, a diffusion sheet provided on an upper surface of the light guide plate, and a prism sheet provided on an upper surface of the light guide plate, and having a plurality of grooves for separating the light guide plate into a plurality of compartments on one surface of the light guide plate, and at least one light source corresponds to the plurality of compartments. Characterized in that separated configuration.
바람직하게는, 다수 개의 홈에는, 반사재 또는 차광재가 설치되며, 다수 개의 홈의 깊이(D)는, 도광판의 두께(T)의 30% 이상의 범위로 이루어진 것을 특징으로 한다.Preferably, a plurality of grooves are provided with a reflecting material or a light shielding material, and the depth D of the plurality of grooves is characterized by being made in a range of 30% or more of the thickness T of the light guide plate.
이상에서 설명한 바와 같이, 본 발명에 따르면, 도광판에 하나 이상의 홈을 형성시킴으로써, 도광판을 다수개의 구획으로 분리하고, 분리된 다수개의 구획 각각에 광원을 배치시킴으로써, 원하는 영역만의 밝기 제어를 할 수 있다.As described above, according to the present invention, by forming one or more grooves in the light guide plate, the light guide plate is divided into a plurality of compartments, and a light source is disposed in each of the separated plurality of compartments, thereby controlling brightness of only a desired region. have.
또한, 본 발명에 따르면, 도광판에 형성되는 다수 개의 홈에 반사재 또는 차광재를 설치함으로써, 각 구획간 빛의 이동을 차단하여 로컬디밍기능을 손쉽게 구현할 수 있는 효과가 있다.In addition, according to the present invention, by installing a reflective material or a light shielding material in a plurality of grooves formed in the light guide plate, there is an effect that can easily implement the local dimming function by blocking the movement of light between each compartment.
도 1은 종래의 면광원 장치를 개략적으로 도시한 단면도이다.1 is a cross-sectional view schematically showing a conventional surface light source device.
도 2는 본 발명의 일 실시예에 따른 면광원 장치를 도시한 분리사시도이다.2 is an exploded perspective view showing a surface light source device according to an embodiment of the present invention.
도 3의 (a) 내지 (c)는 본 발명에 따른 도광판의 일면에 형성된 홈의 여러가지 실시예를 도시한 것이다.3A to 3C illustrate various embodiments of grooves formed on one surface of the light guide plate according to the present invention.
도 4는 본 발명의 일 실시예에 따라 도광판의 표면에 형성되는 홈의 깊이(D)와 도광판의 두께(T)와의 관계를 도시한 도면이다.4 is a diagram illustrating a relationship between a depth D of a groove formed on a surface of the light guide plate and a thickness T of the light guide plate according to the exemplary embodiment of the present invention.
이하에서는 첨부 도면을 참조하여 본 발명에 따른 로컬디밍기능을 가지는 백라이트 장치에 대하여 가장 바람직한 실시예를 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 having a local dimming function 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 forms, and only the present embodiments are intended to complete the disclosure of the present invention and to those skilled in the art. It is provided for complete information.
이하에서 첨부된 도면을 참조하면서 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the accompanying drawings.
도 2는 본 발명의 일 실시예에 따른 면광원 장치를 도시한 분리사시도이다.2 is an exploded perspective view showing a surface light source device according to an embodiment of the present invention.
도　2를 참조하면, 면광원장치(200)에는 도광판(210)이 마련되어 있다. 도광판(210)의 하부면에는 도광패턴(220)이 형성되어 있다. 또한 도광판(210)의 일면에는 도광판(210)을 다수 개의 구획으로 구분하는 다수 개의 홈(230)이 형성되어 있다. 도광판(210)의 하부에는 입사되는 빛을 상부로 반사시킬 수 있는 반사시트(240)가 설치되어 있다. 도광판(210)의 측벽에는 도광판(210)의 각각의 구획으로 빛을 스캐닝하는 다수 개의 광원(270)이 분리 설치되어 있다. 한편, 도광판(210) 상부에는 빛을 산란 및 확산시키는 확산시트(250)와 빛의 방향을 조절하는 프리즘시트(260)가 더 설치되어 있다. Referring to FIG. 2, the light guide plate 210 is provided in the surface light source device 200. The light guide pattern 220 is formed on the bottom surface of the light guide plate 210. In addition, a plurality of grooves 230 are formed on one surface of the light guide plate 210 to divide the light guide plate 210 into a plurality of compartments. The lower portion of the light guide plate 210 is provided with a reflective sheet 240 for reflecting the incident light to the top. A plurality of light sources 270 for scanning light into each section of the light guide plate 210 are separately provided on the sidewall of the light guide plate 210. On the other hand, the light guide plate 210 is further provided with a diffusion sheet 250 for scattering and diffusing light and a prism sheet 260 for adjusting the direction of light.
도광판(210) 각각의 구획 측면에 분리 설치된 광원(270)에서 출광된 빛은 도광판(210) 각각의 구획 측면으로 입사되고, 도광판(210) 각 구획 내로 입사된 빛은 전반사 효과에 의해 도광판(210) 내부를 도광하여 이동한다. 도광된 광 중 도광패턴(220)에 닿은 빛은 전반사 임계각을 초과하는 입사각에 의해 도광판(210) 외부로 출사된다. 이렇게 도광패턴(220)에서 출사된 빛은 반사시트(240)를 거쳐 반사되고 다시 도광판(210)을 관통한 후 도광판 상면의 확산시트(230)을 통과하여 프리즘시트(260)로 입사하고 프리즘시트(260)를 거쳐 높은 방향성을 가지는 고휘도의 빛이 된다. 이때 도광패턴(220)은 도광판(210)의 각각의 구획 내에서 광원(270)에서 가까운 부위는 밀도가 낮게 광원(270)에서 먼 부분은 밀도가 높게 배치되어 균일한 면광원을 이루도록 하며, 다수 개의 광원(270)을 각각 다르게 디밍함으로써 각각의 구획을 밝기를 다른 구획과 차등되게 조절되도록 한다. 또한 다수 개의 홈(230)에 차광재나 반사재를 설치하여 각 구획간 빛의 이동을 차단할 수 있다. 이로서 도광판(210)을 사용하는 에지라이트 백라이트 장치에서 로컬디밍을 손쉽게 이루게 된다.The light emitted from the light source 270 separately installed on the side surfaces of each of the light guide plates 210 is incident on the side surfaces of each of the light guide plates 210, and the light incident into each of the light guide plates 210 is reflected by the total reflection effect. ) Light guide and move inside. Among the light guided, the light reaching the light guide pattern 220 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 light guide pattern 220 is reflected through the reflective sheet 240, passes through the light guide plate 210 again, passes through the diffusion sheet 230 on the upper surface of the light guide plate, and enters the prism sheet 260. It becomes the high brightness light which has high directionality through 260. In this case, the light guide pattern 220 has a low density at a portion close to the light source 270 in each compartment of the light guide plate 210 and a high density at a portion far from the light source 270 to form a uniform surface light source. By dimming the two light sources 270 differently, each compartment may be adjusted to be different from the other compartment. In addition, a plurality of grooves 230 may be provided with a light shielding material or a reflecting material to block the movement of light between each compartment. As a result, local dimming is easily performed in the edge light backlight device using the light guide plate 210.
한편, 도 3의 (a) 내지 (c)는 본 발명에 따른 도광판의 일면에 형성된 홈의 여러가지 실시예를 도시한 것이며, 도 4는 본 발명의 일 실시예에 따라 도광판의 표면에 형성되는 홈의 깊이(D)와 도광판의 두께(T)와의 관계를 도시한 도면이다.Meanwhile, FIGS. 3A to 3C illustrate various embodiments of grooves formed on one surface of the light guide plate according to the present invention, and FIG. 4 illustrates grooves formed on the surface of the light guide plate according to one embodiment of the present invention. Is a diagram showing the relationship between the depth D and the thickness T of the light guide plate.
도 2 내지 도 4을 참조하면, 본 발명의 일 실시예에 따라, 도광판(210)의 일면에는 다수 개의 광원(270)으로부터 입사되는 빛을 원하는 구획에서만 사용할 수 있도록 도광판(210)을 분리하기 위한 다수 개의 홈(230)이 도광판(210)의 전 영역에 걸쳐서 형성되어 있다. 홈(230)은 밝기를 제어하고자 하는 구획의 최소 크기에 따라 일정한 깊이를 가지고 형성되어 있다. 이러한 홈의 깊이(D)와 도광판의 두께(T)간의 관계가 도 4에 도시되어 있다. 2 to 4, according to one embodiment of the present invention, one surface of the light guide plate 210 is provided for separating the light guide plate 210 so that light incident from the plurality of light sources 270 can be used only in a desired compartment. A plurality of grooves 230 are formed over the entire area of the light guide plate 210. The groove 230 is formed to have a constant depth according to the minimum size of the section to control the brightness. The relationship between the depth D of the groove and the thickness T of the light guide plate is shown in FIG. 4.
도 4에 도시된 바와 같이, 홈(230)의 깊이(D)는 도광판(210)의 두께(T)의 30% 이상 최대 100%의 범위가 바람직한데, 그 이유는 홈(230)의 깊이(D)가 도광판(210) 두께(T)의 30% 이하의 경우 광의 차단 효과가 미미하여 충분한 콘트라스트를 얻을 수 없기 때문이다. 이러한 홈(230)은 NC 직가공이나 레이저 가공, 가열프레스 가공, 사출 성형 등 여러가지 공법에 의해 형성될 수 있다. 한편, 홈(230)에는 반사재나 차광재를 추가로 설치함으로써, 각 구획간 빛의 이동을 차단하여 로컬디밍기능을 손쉽게 구현할 수 있다.As shown in FIG. 4, the depth D of the groove 230 is preferably in the range of 30% or more and up to 100% of the thickness T of the light guide plate 210, because the depth D of the groove 230 is This is because when D) is 30% or less of the thickness T of the light guide plate 210, the light blocking effect is insignificant and sufficient contrast cannot be obtained. The groove 230 may be formed by various methods such as NC direct processing, laser processing, heat press processing, injection molding. On the other hand, by additionally installing a reflector or a light shielding material in the groove 230, it is possible to easily implement the local dimming function by blocking the movement of light between each compartment.
이상 도면과 명세서에서 최적 실시예들이 개시되었다. 여기서 특정한 용어들이 사용되었으나, 이는 단지 본 발명을 설명하기 위한 목적에서 사용된 것이지 의미 한정이나 특허청구범위에 기재된 본 발명의 범위를 제한하기 위하여 사용된 것은 아니다. 그러므로 본 기술 분야의 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 타 실시예가 가능하다는 점을 이해할 것이다. 따라서, 본 발명의 진정한 기술적 보호 범위는 첨부된 특허청구범위의 기술적 사상에 의해 정해져야 할 것이다.The best embodiments have been disclosed in the drawings and specification above. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (3)

  1. 백라이트 장치에 있어서,In the backlight device,
    도광판; Light guide plate;
    상기 도광판의 측면에 설치된 하나 이상의 광원;At least one light source disposed at a side of the light guide plate;
    상기 도광판의 하면에 설치된 반사시트;A reflection sheet provided on a bottom surface of the light guide plate;
    상기 도광판의 상면에 설치된 확산시트; 및A diffusion sheet disposed on an upper surface of the light guide plate; And
    상기 확산시트 상면에 설치된 프리즘 시트를 포함하며, A prism sheet disposed on an upper surface of the diffusion sheet,
    상기 도광판의 일면에 도광판을 다수 개의 구획으로 분리하는 다수 개의 홈을 가지고, One surface of the light guide plate has a plurality of grooves for separating the light guide plate into a plurality of compartments,
    상기 하나 이상의 광원이 상기 다수 개의 구획에 대응되도록 분리 구성된 것을 특징으로 하는 로컬디밍기능을 가지는 백라이트 장치.The backlight device having a local dimming function, characterized in that the one or more light sources are separated to correspond to the plurality of compartments.
  2. 제1항에 있어서,The method of claim 1,
    상기 다수 개의 홈에는, 반사재 또는 차광재가 설치된 것을 특징으로 하는 로컬디밍기능을 가지는 백라이트 장치.The backlight device having a local dimming function, characterized in that the plurality of grooves, a reflecting material or a light shielding material is installed.
  3. 제1항에 있어서, The method of claim 1,
    상기 다수 개의 홈의 깊이(D)는, 상기 도광판의 두께(T)의 30% 이상의 범위로 이루어진 것을 특징으로 하는 로컬디밍기능을 가지는 백라이트 장치.And a depth D of the plurality of grooves is in a range of 30% or more of the thickness T of the light guide plate.
PCT/KR2009/001481 2009-03-24 2009-03-24 Backlight device with localised dimming function WO2010110497A1 (en)

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KR1020117021814A KR20120139525A (en) 2009-03-24 2009-06-12 Backlight device with localised dimming function
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KR20050112661A (en) * 2004-05-27 2005-12-01 엘지.필립스 엘시디 주식회사 Backlight assembly and liquid crystal display equipped in thereof
KR100780205B1 (en) * 2006-04-21 2007-11-27 삼성전기주식회사 Backlight unit for liquid crystal display device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108227066A (en) * 2018-01-03 2018-06-29 京东方科技集团股份有限公司 A kind of light guide plate assembly, backlight and display device
US10690833B2 (en) 2018-01-03 2020-06-23 Boe Technology Group Co., Ltd. Light guide plate assembly, backlight source and display device

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KR20120139525A (en) 2012-12-27
WO2010110507A1 (en) 2010-09-30

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