KR20030079019A - The direct lighting back light for high brightness - Google Patents
The direct lighting back light for high brightness Download PDFInfo
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- KR20030079019A KR20030079019A KR1020020017761A KR20020017761A KR20030079019A KR 20030079019 A KR20030079019 A KR 20030079019A KR 1020020017761 A KR1020020017761 A KR 1020020017761A KR 20020017761 A KR20020017761 A KR 20020017761A KR 20030079019 A KR20030079019 A KR 20030079019A
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- fluorescent lamp
- plate
- disposed
- light guide
- guide plate
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- 238000009792 diffusion process Methods 0.000 claims abstract description 47
- 239000003973 paint Substances 0.000 claims description 8
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- 239000004926 polymethyl methacrylate Substances 0.000 description 4
- 238000002310 reflectometry Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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- 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
- G02F1/133602—Direct backlight
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
- F21V2200/20—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of a generally planar shape
-
- 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
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
본 발명은 고휘도를 위한 직하형 백라이트에 관한 것으로서, 특히 형광램프를 직하형으로 배치시키고 상기 형광램프가 위치한 상단에는 확산판의 두께는 두껍게 하고, 형광램프의 양측에는 확산판의 두께는 얇게 함으로써 휘도의 균일도를 유지시키는 휘도가 향상된 직하형 백라이트에 관한 것이다.The present invention relates to a direct type backlight for high brightness, and in particular, the fluorescent lamp is arranged in a direct type, and the thickness of the diffuser plate is thickened on the upper side where the fluorescent lamp is located, and the thickness of the diffuser plate is thinned on both sides of the fluorescent lamp. It relates to a direct backlight having improved brightness to maintain a uniformity of.
상기한 목적을 달성하기 위하여 본 발명은, 반사판과, 상기 반사판 상에 배치되는 도광판을 포함하는데, 상기 도광판은 그 상부에 형광램프 안착홈과 상기 램프 안착홈의 양단에 형성되는 돌출 곡선부를 구비하며, 상기 도광판 상에 배치되는 확산판을 포함하는데, 상기 확산판은 상기 형광램프 안착홈의 상단에 놓여지는 유두형 단면의 돌출부와 상기 도광판의 돌출 곡선부에 대응하는 함몰 곡선부를 구비하고, 상기 돌출부의 두께는 상기 함몰 곡선부의 두께보다 상대적으로 두꺼우며, 상기 확산판 상에 배치되는 확산시트를 포함하는 것을 특징으로 한다.In order to achieve the above object, the present invention includes a reflecting plate and a light guide plate disposed on the reflecting plate, wherein the light guide plate includes a fluorescent lamp seating groove and protruding curves formed at both ends of the lamp seating groove. And a diffuser plate disposed on the light guide plate, wherein the diffuser plate includes a protrusion having a papillary cross section disposed on an upper end of the fluorescent lamp seating groove and a depression curve corresponding to the protrusion curve of the light guide plate. The thickness is relatively thicker than the thickness of the recessed curve, characterized in that it comprises a diffusion sheet disposed on the diffusion plate.
상기한 구성의 본 발명에 의하면, 확산판을 형광램프 상단 부분의 확산판 두께를 두껍게 형성하고 형광램프의 양측 부분은 확산판을 얇게 형성함으로써, 휘도의 균일도 및 고휘도를 얻을 수 있는 잇점이 있다.According to the present invention having the above-described configuration, the diffuser plate is formed to have a thick diffuser plate thickness of the upper portion of the fluorescent lamp and the diffuser plate is formed thinly at both sides of the fluorescent lamp, whereby uniformity and high luminance of luminance can be obtained.
Description
본 발명은 고휘도를 위한 직하형 백라이트에 관한 것으로서, 특히 형광램프를 직하형으로 배치시키고 상기 형광램프가 위치한 상단에는 확산판의 두께는 두껍게 하고, 형광램프의 양측에는 확산판의 두께는 얇게 함으로써 휘도의 균일도를 유지시키는 휘도가 향상된 직하형 백라이트에 관한 것이다.The present invention relates to a direct type backlight for high brightness, and in particular, the fluorescent lamp is arranged in a direct type, and the thickness of the diffuser plate is thickened on the upper side where the fluorescent lamp is located, and the thickness of the diffuser plate is thinned on both sides of the fluorescent lamp. It relates to a direct backlight having improved brightness to maintain a uniformity of.
본 발명은 발명의 명칭이 "형광램프 평면 배치형 LCD 백라이터"인 특허출원 제 1999-0053193호(이하 '0053193호라 함), 발명의 명칭이 "도광판 혼용 직하형 백라이트"인 특허출원 제 2001-0011486호(이하 '11486호라 함) 및 발명의 명칭이 "LCD용 백라이트"인 특허출원번호 제 10-2002-0011566호(이하 '11566호라 함)의 보완 출원이다.The present invention discloses a patent application No. 1999-0053193 (hereinafter referred to as' 0053193), which is named "Fluorescent lamp flat panel type LCD backlighter", and a patent application No. 2001-, which is named "light mixing plate mixed direct type backlight". It is a supplementary application of 0011486 (hereinafter referred to as '11486) and Patent Application No. 10-2002-0011566 (hereinafter referred to as' 11566) which is named "Backlight for LCD".
일반적인 백라이트 구조에서는 형광램프의 상단은 휘도가 매우 높고, 측방향은 휘도가 낮은 델타 함수형 휘도 분포를 갖는다. 이러한 휘도 분포는 확산판을 구비하여 휘도의 균일도를 유지하는데, 이때 확산판이 상당히 두껍게 구비되어야 한다.In a typical backlight structure, the upper end of the fluorescent lamp has a very high brightness and the lateral direction has a delta function luminance distribution having low brightness. This luminance distribution is provided with a diffuser plate to maintain uniformity of luminance, where the diffuser plate must be provided quite thick.
그러나, 확산판이 두꺼울수록 많은 빛의 손실을 초래함으로 확산판의 두께에 반비례하게 휘도가 저감되는 문제점이 있었다.However, the thicker the diffusion plate, the more the loss of light causes a problem that the brightness is reduced in inverse proportion to the thickness of the diffusion plate.
또한, 상기 '0053193호, '11486호 및 '11566호는 도광판의 하부에 형광램프를 위치시킴으로써, 형광램프의 빛이 상기 도광판 상부로 통과하는 과정에서 빛이 손실되는 문제점 있었다.In addition, the '0053193,' 11486 and '11566 are located in the lower portion of the light guide plate, there is a problem that the light is lost in the process of passing the light of the fluorescent lamp to the upper light guide plate.
본 발명은 상기한 문제점을 해결하기 위하여 안출된 것으로서, 본 발명의 목적은 형광램프 상단 부분의 확산판 두께는 두껍게 형성하고, 형광램프 양측 상단의 확산판 두께는 얇게 형성함으로써, 휘도의 균일도를 유지할 수 있는 휘도가 향상된 직하형 백라이트를 제공하는 것이다.The present invention has been made to solve the above problems, an object of the present invention is to form a thick diffuser plate thickness of the upper portion of the fluorescent lamp, thinner diffuser plate thickness on both sides of the fluorescent lamp, thereby maintaining the uniformity of brightness It is to provide a direct backlight having improved brightness.
본 발명의 다른 목적은 도광판 상부에 형광램프를 위치시킴으로써 확산판으로 빛이 직접 전파되도록 할 수 있는 휘도가 향상된 직하형 백라이트를 제공하는 것이다.Another object of the present invention is to provide a direct-type backlight with improved brightness that allows light to propagate directly to the diffusion plate by placing a fluorescent lamp on the light guide plate.
본 발명의 또 다른 목적은 확산시트를 2장 또는 3장 구비함으로써 휘도의 균일도를 향상시키는 휘도가 향상된 직하형 백라이트를 제공하는 것이다.It is still another object of the present invention to provide a direct backlight having improved brightness to improve the uniformity of brightness by providing two or three diffusion sheets.
본 발명의 또 다른 목적은 도광판 및 확산판에 특정 무늬를 프린팅함으로써 휘도의 균일도를 유지할 수 있는 휘도가 향상된 직하형 백라이트를 제공하는 것이다.Still another object of the present invention is to provide a direct type backlight having improved brightness capable of maintaining uniformity of brightness by printing a specific pattern on the light guide plate and the diffusion plate.
도 1은 본 발명의 제1 실시예에 따른 직하형 백라이트의 분리 사시도.1 is an exploded perspective view of a direct type backlight according to a first embodiment of the present invention;
도 2는 본 발명의 제2 실시예에 따른 직하형 백라이트의 단면도.2 is a sectional view of a direct type backlight according to a second embodiment of the present invention;
도 3은 본 발명의 제3 실시예에 따른 직하형 백라이트의 단면도.3 is a sectional view of a direct type backlight according to a third embodiment of the present invention;
도 4는 본 발명의 제4 실시예에 따른 직하형 백라이트의 단면도.4 is a sectional view of a direct type backlight according to a fourth embodiment of the present invention;
도 5는 본 발명의 제5 실시예에 따른 직하형 백라이트의 단면도.5 is a sectional view of a direct type backlight according to a fifth embodiment of the present invention;
<도면의 주요부분에 대한 부호의 설명><Description of Symbols for Main Parts of Drawings>
10 : 형광램프20 : 반사판10 fluorescent lamp 20 reflector
30 : 도광판 40 : 확산판30: light guide plate 40: diffuser plate
50, 52 : 확산시트 36 : 돌출 곡선부50, 52: diffusion sheet 36: protrusion curve
38 : 형광램프 안착홈42 : 돌출부38: fluorescent lamp seating groove 42: protrusion
44 : 함몰 곡선부60, 62 : 프린팅 무늬44: curved curve portion 60, 62: printing pattern
70 : 공기층70: air layer
상기한 목적을 달성하기 위하여 본 발명은, 반사판과, 상기 반사판 상에 배치되는 도광판을 포함하는데, 상기 도광판은 그 상부에 형광램프 안착홈과 상기 램프 안착홈의 양단에 형성되는 돌출 곡선부를 구비하며, 상기 도광판 상에 배치되는 확산판을 포함하는데, 상기 확산판은 상기 형광램프 안착홈의 상단에 놓여지는 유두형 단면의 돌출부와 상기 도광판의 돌출 곡선부에 대응하는 함몰 곡선부를 구비하고, 상기 돌출부의 두께는 상기 함몰 곡선부의 두께보다 상대적으로 두꺼우며, 상기 확산판 상에 배치되는 확산시트를 포함하는 것을 특징으로 한다.In order to achieve the above object, the present invention includes a reflecting plate and a light guide plate disposed on the reflecting plate, wherein the light guide plate includes a fluorescent lamp seating groove and protruding curves formed at both ends of the lamp seating groove. And a diffuser plate disposed on the light guide plate, wherein the diffuser plate includes a protrusion having a papillary cross section disposed on an upper end of the fluorescent lamp seating groove and a depression curve corresponding to the protrusion curve of the light guide plate. The thickness is relatively thicker than the thickness of the recessed curve, characterized in that it comprises a diffusion sheet disposed on the diffusion plate.
이하, 첨부한 도면들을 참조로 본 발명의 바람직한 실시예를 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 발명의 제1 실시예에 따른 직하형 백라이트의 분리 사시도이다. 도시된 바와같이, 상기 백라이트는 반사판(20), 도광판(30), 확산판(40) 및 확산시트(50, 52)로 구성된다.1 is an exploded perspective view of a direct type backlight according to a first embodiment of the present invention. As shown, the backlight is composed of a reflecting plate 20, a light guide plate 30, a diffusion plate 40, and diffusion sheets 50 and 52.
상기 반사판(20)의 상부는 형광램프(10)로부터 빛을 측면으로 유도하기 위한 소정의 경사구조(24)를 가진다.The upper portion of the reflective plate 20 has a predetermined inclined structure 24 for guiding light from the fluorescent lamp 10 to the side.
상기 도광판(30)은 상기 반사판(20) 상에 구비되며, 상기 도광판(30) 하부는 형광램프(10)로부터 빛을 측면으로 유도하기 위한 소정의 경사구조(34)를 가진다.The light guide plate 30 is provided on the reflective plate 20, and the lower part of the light guide plate 30 has a predetermined inclined structure 34 for guiding light from the fluorescent lamp 10 to the side.
또한, 상기 도광판(30) 상부는 일정 간격으로 형광램프 안착홈(38)과 상기 형광램프 안착홈(38)의 양단에 형성되는 돌출 곡선부(36)가 형성된다. 여기서, 상기 형광램프 안착홈(38)에 형광램프(10)가 배치되며, 상기 형광램프(10)는 냉음극 형광램프나 외부형극 형광램프가 채용될 수 있다.In addition, the upper portion of the light guide plate 30 is formed with a fluorescent lamp seating groove 38 and a protrusion curve 36 formed on both ends of the fluorescent lamp seating groove 38 at regular intervals. Here, the fluorescent lamp 10 is disposed in the fluorescent lamp seating groove 38, the fluorescent lamp 10 may be a cold cathode fluorescent lamp or an external type fluorescent lamp.
상기 확산판(40)은 상기 도광판(30) 상에 배치되며, 상기 도광판(30)의 형광램프 안착홈(38)의 상단에 놓여지는 유두형 단면의 돌출부(42)와 상기 도광판(30)의 돌출 곡선부(36)에 대응하는 함몰 곡선부(44)를 구비한다. 여기서, 상기 돌출부(42)의 두께는 상기 함몰 곡선부(44)의 두께보다 상대적으로 두껍다.The diffusion plate 40 is disposed on the light guide plate 30 and protrudes from the projection 42 of the nipple-shaped cross section which is disposed on an upper end of the fluorescent lamp seating groove 38 of the light guide plate 30. A recessed curved portion 44 corresponding to the curved portion 36 is provided. Here, the thickness of the protrusion 42 is relatively thicker than the thickness of the depression curve 44.
상기 확산시트(50, 52)는 상기 확산판(40) 상에 배치되고, 휘도의 균일도를 향상시키는 역활을 한다. 여기서, 상기 확산시트(50, 52)는 평판형이며 바람직하게 2장 또는 3장으로 구성된다.The diffusion sheets 50 and 52 are disposed on the diffusion plate 40 and serve to improve the uniformity of luminance. Here, the diffusion sheets 50 and 52 are flat and preferably composed of two or three sheets.
한편, 백라이트는 상기 형광램프(10)로 부터 상단으로 향하는 빛은도광판(30)을 통과한 후 확산판(40)에 의해 확산되고, 형광램프(10)로부터 하단으로 향하는 빛은 반사판(20)에 의해 반사되어 상단으로 빛이 향하도록 구성되어 있다.On the other hand, the backlight is diffused by the diffuser plate 40 after the light from the fluorescent lamp 10 toward the top passes through the light guide plate 30, the light from the fluorescent lamp 10 toward the bottom reflector 20 Reflected by the light is directed toward the top.
상기 형광램프(10)는 도광판(30) 상부에 형성된 형광램프 안착홈(38)에 배치되는데, 이는 상기 형광램프(10)의 빛이 도광판(30)을 통과하면서 발생하는 빛의 손실을 최소화 시키기 위함이다.The fluorescent lamp 10 is disposed in the fluorescent lamp seating groove 38 formed on the light guide plate 30, which minimizes the loss of light generated while the light of the fluorescent lamp 10 passes through the light guide plate 30. For sake.
또한, 상기 확산판(40)은 상기 형광램프(10)가 위치한 상부는 두껍게 형성되고, 상기 형광램프(10)의 양측은 얇게 형성된다. 즉, 휘도가 높은 부분은 확산판(40)의 두께를 두껍게 하고, 휘도가 낮은 부분은 확산판(40)의 두께를 얇게 함으로써 빛의 손실을 최소화 시키는 것이다.In addition, the diffusion plate 40 is formed in a thick upper portion where the fluorescent lamp 10 is located, both sides of the fluorescent lamp 10 is formed thin. That is, the portion with high luminance thickens the thickness of the diffusion plate 40 and the portion with low luminance minimizes the loss of light by making the thickness of the diffusion plate 40 thin.
본 발명인의 실험에 의하면 상기의 구조에서 형광램프의 간격이 25 mm일 때, 상기 두껍게 형성된 부분(즉, 돌출부(42))의 두께는 바람직하게는 약 3 mm이며, 상기 얇게 형성된 부분(즉, 함몰 곡선부(44))의 길이는 약 1 mm 이다.According to the experiments of the inventors, when the distance between the fluorescent lamps in the above structure is 25 mm, the thickness of the thickly formed portion (that is, the protrusion 42) is preferably about 3 mm, and the thinly formed portion (that is, The depression curve 44 is about 1 mm long.
그리고, 상기 돌출부(42)는 상기 형광램프 안착홈(38)의 상단에 놓여져 상기 형광램프(10)를 고정시키는 역활을 한다.In addition, the protrusion 42 is placed on the upper end of the fluorescent lamp seating groove 38 and serves to fix the fluorescent lamp 10.
상기 형광램프(10) 상부에 위치한 반사판(20)의 상단면 및 상기 도광판(30)의 하단면에 반사형 도료가 일정한 무늬(62)로 프린팅되어 있다. 여기서, 상기 프린팅된 무늬(60,62)는 형광램프(10) 상단의 빛을 감쇄시키고 좌우로 빛을 분산시켜 휘도를 균일하게 하는 역활을 한다. 상기 프린팅 재질은 반사성이 좋은 흰색의 도료를 사용하며, 무늬의 형태는 미세한 점이나 선형 등의 무늬이다. 상기무늬(60,62)는 형광램프(10) 상단의 중앙 부분에 조밀하게 배치되며, 도광판(30) 하단면에는 밀도를 약하게 배치된다.Reflective paint is printed on the upper surface of the reflective plate 20 located above the fluorescent lamp 10 and the lower surface of the light guide plate 30 in a constant pattern 62. Here, the printed patterns (60, 62) serves to attenuate the light on the top of the fluorescent lamp 10 and to distribute the light to the left and right to make the luminance uniform. The printing material uses a white paint having good reflectivity, and the shape of the pattern is a fine dot or a pattern such as linear. The patterns 60 and 62 are densely arranged in the center portion of the upper end of the fluorescent lamp 10 and the density is weakly disposed on the bottom surface of the light guide plate 30.
상기 도광판(30)과 확산판(40)은 PMMA(Poly Methyl Methacrylate :폴리메틸메타크릴레이트) 재질로서, 일반적으로 도광판(300은 투명 PMMA를 채용하고, 확산판(40)은 확산성 PMMA를 채용한다.The light guide plate 30 and the diffusion plate 40 are made of polymethyl methacrylate (PMMA), and generally, the light guide plate 300 employs a transparent PMMA, and the diffusion plate 40 employs a diffusive PMMA. do.
도 2는 본 발명의 제2 실시예에 따른 직하형 백라이트의 단면도이다. 도 2는 상기 도 1과 동일한 구성이며, 상기 반사판(20) 상부와 도광판(30) 하부가 평판평인 제 2 실시예를 나타낸 것이다.2 is a cross-sectional view of a direct type backlight according to a second embodiment of the present invention. FIG. 2 is the same configuration as that of FIG. 1 and shows a second embodiment in which the upper portion of the reflector plate 20 and the lower portion of the light guide plate 30 are flat.
상기 도광판(30)이 평판형인 경우, 상기 도광판(30)의 하부에 반사형 도료가 일정한 무늬(62)로 프린팅되어 빛의 휘도를 저감시키는 역활을 한다.When the light guide plate 30 is a flat plate, a reflective paint is printed on a lower portion of the light guide plate 30 in a predetermined pattern 62 to reduce the brightness of light.
도 2는 반사판(20) 및 도광판(30) 형태가 변형된 것 이외에는 상기 도 1과 동일한 구조이므로 자세한 설명은 생략한다.2 is the same structure as that of FIG. 1 except that the shape of the reflector 20 and the light guide plate 30 is modified, and thus detailed description thereof will be omitted.
도 3는 본 발명의 제3 실시예에 따른 직하형 백라이트의 단면도이다. 도시된 바와 같이, 반사판(20)과, 상기 반사판(20) 상에 배치되는 도광판(30)을 포함하는데, 상기 도광판(30)은 그 상부에 형광램프 안착홈(38)과 상기 형광램프 안착홈(38)의 양단에 형성되는 경사부(37)를 구비하며, 상기 도광판(30) 상에 배치되는 확산판(40)을 포함하는데, 상기 확산판(40)은 상기 형광램프 안착홈(38)의 상단에 놓여지는 V자형 단면의 돌출부(42)와 상기 도광판의 경사부(37)에 대응하는 제2 경사부(46)를 구비하고, 상기 돌출부(42)의 두께는 상기 제2 경사부(46)의 두께보다 상대적으로 두꺼우며, 상기 확산판(40)의 상부에 배치되는 확산시트(50,52)로 구성된다.3 is a cross-sectional view of a direct type backlight according to a third embodiment of the present invention. As shown, it includes a reflecting plate 20 and a light guide plate 30 disposed on the reflecting plate 20, the light guide plate 30 is a fluorescent lamp seating groove 38 and the fluorescent lamp seating groove thereon. And an inclined portion 37 formed at both ends of the 38, and includes a diffusion plate 40 disposed on the light guide plate 30, wherein the diffusion plate 40 includes the fluorescent lamp seating groove 38. And a second inclined portion 46 corresponding to the inclined portion 37 of the light guide plate and a protrusion 42 having a V-shaped cross section disposed at an upper end of the light guide plate. It is relatively thicker than the thickness of 46, and consists of diffusion sheets 50 and 52 disposed on the diffusion plate 40.
또한, 상기 도광판(30)의 하부와 반사판(20)의 상부는 각각 형광램프(10)로부터 빛을 측면으로 유도하기 위한 소정의 경사구조(34,24)를 구비할 수 있다.In addition, the lower portion of the light guide plate 30 and the upper portion of the reflective plate 20 may have predetermined inclined structures 34 and 24 for guiding light from the fluorescent lamp 10 to the side.
도 4는 본 발명의 제4 실시예에 따른 직하형 백라이트의 단면도이다. 도 4(a)는 반사판(20)과, 상기 반사판(20) 상에 배치되는 형광램프(10)와, 상기 형광램프(10) 상에 배치되는 확산판(40)을 포함하는데, 상기 확산판(40)은 상기 형광램프(10)의 상단에 놓여지는 유두형 단면의 돌출부(42)와 상기 돌출부(42)의 양단에 형성되는 함몰 곡선부(44)를 구비하고, 상기 돌출부(42)의 두께는 상기 함몰 곡선부(44)의 두께보다 상대적으로 두꺼우며, 상기 확산판(40) 상에 배치되는 확산시트(50,52)로 구성된다.4 is a cross-sectional view of a direct type backlight according to a fourth embodiment of the present invention. 4 (a) includes a reflector plate 20, a fluorescent lamp 10 disposed on the reflector plate 20, and a diffuser plate 40 disposed on the fluorescent lamp 10, the diffusion plate 40 includes a protrusion 42 having a papillary cross section placed on an upper end of the fluorescent lamp 10 and a recessed curved portion 44 formed at both ends of the protrusion 42, and has a thickness of the protrusion 42. Is relatively thicker than the thickness of the recessed curved portion 44, and is composed of diffusion sheets 50 and 52 disposed on the diffusion plate 40.
상기 반사판(20)의 상부는 각각 형광램프(10)로부터 빛을 측면으로 유도하기 위한 소정의 경사구조(34,24)를 구비할 수 있다.The upper portion of the reflective plate 20 may have predetermined inclined structures 34 and 24 for guiding light from the fluorescent lamp 10 to the side.
도 4(b)는 상기 확산판(40)의 형태가 V자형 단면의 돌출부(42)와 상기 돌출부(42)의 양단에 형성되는 제2 경사부(46)를 구비한다는것 이외에는 상기 도 4(a)와 동일한 구조를 가지므로 자세한 설명은 생략한다.FIG. 4B shows that the diffusion plate 40 has a protrusion 42 having a V-shaped cross section and a second inclined portion 46 formed at both ends of the protrusion 42. Since it has the same structure as a), detailed description thereof will be omitted.
도 4(a) 및 도 4(b)는 도광판(30)을 구비하지 않고, 확산판(40)만을 구비한다. 따라서, 상기 도광판(30)을 구비하지 않으므로써 반사판(20)과 확산판(40) 사이에는 공기층(70)이 형성되며, 상기 공기층(70)의 작용은 형광램프(10) 상단으로 향하는 빛의 확산과 확산판(40) 상단면으로 빛이 전반사되는 효과를 가진다.4 (a) and 4 (b) do not include the light guide plate 30 but only the diffusion plate 40. Therefore, the air layer 70 is formed between the reflecting plate 20 and the diffusion plate 40 by not providing the light guide plate 30, and the action of the air layer 70 is that of the light directed toward the top of the fluorescent lamp 10. Diffuse and diffuser plate 40 has the effect of total reflection of the light to the top surface.
도 5는 본 발명의 제5 실시예에 따른 직하형 백라이트의 단면도이다. 도5(a) 및 5(b)에 도시된 바와같이 상기 확산판(40)은 상기 형광램프 안착홈(38)을 기준으로 한정된 길이로 배치된다.5 is a cross-sectional view of a direct type backlight according to a fifth embodiment of the present invention. As shown in FIGS. 5 (a) and 5 (b), the diffusion plate 40 is disposed in a limited length with respect to the fluorescent lamp seating groove 38.
상기와 같이 확산판(40)의 길이를 줄임으로써 빛의 휘도가 저감되는 현상을 최소화 시킬 수 있다.By reducing the length of the diffusion plate 40 as described above it can minimize the phenomenon that the brightness of the light is reduced.
상기 도 5(a) 및 도 5(b)는 상기 형광램프 안착홈(38)을 기준으로 한정된 길이로 배치된다는것 이외에는 상기 도 2 및 도 3과 동일한 구조를 가지므로 자세한 설명은 생략한다.5 (a) and 5 (b) have the same structure as that of FIGS. 2 and 3 except that the fluorescent lamp seating grooves 38 are arranged in a limited length, and thus detailed description thereof will be omitted.
이상에서 본 발명에 대해 상세히 기술하였지만, 본 발명이 속하는 기술분야에 있어서 통상의 지식을 가진 사람이라면, 첨부된 청구범위에 정의된 본 발명의 정신 및 범위를 벗어나지 않으면서 본 발명을 여러 가지로 변형 또는 변경하여 실시할 수 있음은 자명하며, 따라서 본 발명의 실시예에 따른 단순한 변경은 본 발명의 기술을 벗어날 수 없을 것이다.Although the present invention has been described in detail above, those of ordinary skill in the art to which the present invention pertains may variously modify the present invention without departing from the spirit and scope of the present invention as defined in the appended claims. It is apparent that the present invention may be modified or modified. Therefore, a simple change according to an embodiment of the present invention will not be possible without departing from the technology of the present invention.
상기한 구성의 본 발명에 의하면, 형광램프 상단 부분의 확산판 두께를 두껍게 형성하고 형광램프의 양측부분은 확산판을 얇게 형성함으로써, 형광램프 상단의 휘도를 최대한 낮게 함으로써 휘도의 균일도 및 고휘도를 얻을 수 있는 잇점이 있다.According to the present invention having the above-described configuration, by forming a thick diffuser plate thickness of the upper portion of the fluorescent lamp and a thinner diffuser plate on both sides of the fluorescent lamp, the luminance of the upper end of the fluorescent lamp as low as possible to obtain the uniformity and high luminance of the luminance There is an advantage to this.
또한, 상기 도광판 상부에 형광램프를 위치시킴으로써 빛이 도광판을 통과하면서 발생하는 빛의 손실을 최소화 시킬 수 있는 잇점이 있다.In addition, by placing a fluorescent lamp on the light guide plate there is an advantage that can minimize the loss of light generated as the light passes through the light guide plate.
그리고, 확산시트를 2장 또는 3장 구비함으로써 휘도의 균일도를 향상시키는잇점이 있다.In addition, there are advantages of improving the uniformity of luminance by providing two or three diffusion sheets.
또한, 도광판 및 확산판에 반사성이 좋은 흰색 도료를 사용하여 특정 무늬를 프린팅함으로써 휘도의 균일도를 유지할 수 있는 잇점이 있다.In addition, there is an advantage that the uniformity of the brightness can be maintained by printing a specific pattern using a white paint having good reflectivity on the light guide plate and the diffusion plate.
Claims (20)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7033059B2 (en) * | 2003-12-12 | 2006-04-25 | Industrial Technology Research Institute | Light guide apparatus for enhancing light source utilization efficiency |
| KR100705703B1 (en) * | 2005-06-02 | 2007-04-09 | 주식회사 나모텍 | Backlit device |
| KR100823480B1 (en) * | 2006-10-12 | 2008-04-21 | 삼성에스디아이 주식회사 | A diffusion member, a light emitting device having the diffusion member, and a liquid crystal display device using the light emitting device as a backlight unit |
| KR101052890B1 (en) * | 2011-03-24 | 2011-07-29 | 주식회사 건기 | Solar lighting device with hybrid solar diffuser with diffuse refraction and diffuse reflection |
| CN115933251A (en) * | 2022-12-13 | 2023-04-07 | 伟志光电（深圳）有限公司 | Reflecting cover structure capable of guiding light uniformly and backlight module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02208631A (en) * | 1989-02-08 | 1990-08-20 | Copal Co Ltd | Surface light emission body device for lighting liquid crystal display element |
| JPH04269716A (en) * | 1991-02-25 | 1992-09-25 | Sony Corp | Light source device |
| JPH05119312A (en) * | 1991-10-24 | 1993-05-18 | Nec Corp | Back light |
| JPH06235825A (en) * | 1993-02-10 | 1994-08-23 | Nissha Printing Co Ltd | Surface light source device |
| JPH1124075A (en) * | 1997-07-04 | 1999-01-29 | Canon Inc | Light source device and liquid crystal device equipped with the device |
-
2002
- 2002-04-01 KR KR10-2002-0017761A patent/KR100479160B1/en not_active IP Right Cessation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7033059B2 (en) * | 2003-12-12 | 2006-04-25 | Industrial Technology Research Institute | Light guide apparatus for enhancing light source utilization efficiency |
| KR100705703B1 (en) * | 2005-06-02 | 2007-04-09 | 주식회사 나모텍 | Backlit device |
| KR100823480B1 (en) * | 2006-10-12 | 2008-04-21 | 삼성에스디아이 주식회사 | A diffusion member, a light emitting device having the diffusion member, and a liquid crystal display device using the light emitting device as a backlight unit |
| KR101052890B1 (en) * | 2011-03-24 | 2011-07-29 | 주식회사 건기 | Solar lighting device with hybrid solar diffuser with diffuse refraction and diffuse reflection |
| CN115933251A (en) * | 2022-12-13 | 2023-04-07 | 伟志光电（深圳）有限公司 | Reflecting cover structure capable of guiding light uniformly and backlight module |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100479160B1 (en) | 2005-03-25 |
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