KR100307446B1 - Surface light source device - Google Patents
Surface light source device Download PDFInfo
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- KR100307446B1 KR100307446B1 KR1019940033115A KR19940033115A KR100307446B1 KR 100307446 B1 KR100307446 B1 KR 100307446B1 KR 1019940033115 A KR1019940033115 A KR 1019940033115A KR 19940033115 A KR19940033115 A KR 19940033115A KR 100307446 B1 KR100307446 B1 KR 100307446B1
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- light
- lamp
- source device
- light source
- guide plate
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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
- G02B6/0013—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
- G02B6/0031—Reflecting element, 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
- G02B6/005—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
- G02B6/0051—Diffusing 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
- G02B6/005—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
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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
- G02B6/007—Incandescent lamp or gas discharge lamp
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
제1도는 종래 면과원장치를 도시한 사시도,1 is a perspective view showing a conventional cotton and oak device,
제2도는 제1도에 도시된 발광수단을 발췌하여 도시한 단면도,2 is a cross-sectional view showing an extract of the light emitting means shown in FIG.
제3도는 본 발명에 따른 면광원장치의 일부절제 단면도,3 is a partial cross-sectional view of the surface light source device according to the present invention,
제4도는 본 발명에 따른 면광원 장치의 일부절제 사시도.4 is a partially cutaway perspective view of the surface light source device according to the present invention.
* 도면의 주요 부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings
31 : 도광판 32 : 반사판31: Light guide plate 32: Reflective plate
33 : 확산판 40 : 광확산수단33: diffuser plate 40: light diffusion means
42 : 램프 43 : 램프 커버42: lamp 43: lamp cover
50 : 광확산수단50: light diffusion means
본 발명은 화상표시소자의 조명장치에 관한것으로, 더 상세하게는 액정표시소자등의 배면광원으로 사용되는 면광원장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device of an image display element, and more particularly to a surface light source device used as a back light source such as a liquid crystal display element.
통상적으로 액정표시소자와 같은 화상표시소자는 그 자체가 발광하여 화상을 형성하지 못하고 외부로부터 빛을 받아 화상을 형성하는 수광형 발광소자이므로 어두운 곳에서는 화상을 관찰할 수 없는 문제점이 있다.In general, an image display device such as a liquid crystal display device does not form an image by itself and emits light, but receives a light from the outside to form an image. Therefore, there is a problem in that an image cannot be observed in a dark place.
이와 같은 문제저을 해결하기 위하여 액정표시소자의 배면에 면광원을 설치하여 광을 조사함으로써 어두운 곳에서도 화상을 볼 수 있도록 하고 있는데, 최근에는 조명간판, 디스플레이 패널과 같은 면상의 화상표시소자에 광을 조사하는 면광원장치가 부각되고 있다.In order to solve this problem, a surface light source is installed on the back of the liquid crystal display device to illuminate light so that the image can be viewed in a dark place. In recent years, light is applied to image display devices such as lighting signs and display panels. The surface light source device to irradiate is highlighted.
제1도에는 이러한 면광원 장치의 일예를 나타내 보였다.1 shows an example of such a surface light source device.
이것은 일본 공개 특허 공보 소60-216435호에 개시된 것으로, 밀폐된 공간부를 가진 용기의 내부에 교호적으로 격벽이 설치되어 사행(蛇行) 형상의 방전공간이 형성되고 이 방전공간의 양 단부에는 각각 전극이 설치된다. 그리고 상기 방전공간으 상하부에는 형괄체층이 형성된다.This is disclosed in Japanese Laid-Open Patent Publication No. 60-216435, in which a partition wall is alternately installed inside a container having an enclosed space to form a meandering discharge space, and electrodes at both ends of the discharge space. This is installed. In addition, a cortex layer is formed above and below the discharge space.
이와 같이 구성된 종래의 면광원 장치는 상기 전극에 소정의 전위가 인가됨에 따라 상기 방전공간에서 글로우(glow) 방전이 일어나 발생된 광의 자외선이 형광체층을 여기시킴으로써 형광체층으로부터 광을 발하게 된다.In the conventional surface light source device configured as described above, when a predetermined potential is applied to the electrode, a glow discharge occurs in the discharge space, and ultraviolet light of the generated light excites the phosphor layer to emit light from the phosphor layer.
그러나 이러한 면광원 장치는 방전공간의 에지(edge)부에서 발광이 미약하여 균일한 휘도를 얻을 수 없으며, 방전을 위한 고압의 전압이 요구되고 전극이 쉽게 열화되는 문제점이 내재되어 있었다.However, such a surface light source device has a problem in that light emission is weak at the edge portion of the discharge space and thus uniform luminance cannot be obtained, and a high voltage for discharge is required and the electrode is easily deteriorated.
그리고 종래 면광원 장치의 다른 실시예는 제1도 및 제2도에 도시된 바와같이 도광판(21)과, 이 도광판(21)의 하면에 고정설치된 반사판(22)과, 상기 도광판(21)의 상면에 형성된 확산판(23)과, 상기 도광판(21)의 적어도 일측면에 고정설치된 발광수단(25)를 구비하여 구성되는데, 이 발광수단(25)은 도광판(21)의 측면에 고정설치된 램프(25a)와, 도광판(21)의 측면과 대향되는 부위 이외의 램프부위를 감싸는 반사판 부재(25b)를 구비하여 구성된다.Another embodiment of the conventional surface light source device includes a light guide plate 21, a reflector 22 fixed to a bottom surface of the light guide plate 21, and a light guide plate 21 as shown in FIGS. And a light emitting means 25 fixed to at least one side of the light guide plate 21, and the light emitting means 25 is fixed to a side surface of the light guide plate 21. 25a and the reflecting plate member 25b which surrounds lamp | ramp parts other than the site | part which opposes the side surface of the light guide plate 21 is comprised.
이와같이 구성된 종래의 면광원 장치는 발광수단의 램프(25a)로부터 조사된 광이 도광판(21)으로 조사되고 이 도광판(21)으로 조사된 광은 그하면에 설치된 반사판(22)과 전면에 설치된 확산판(23)을 통하여 전면으로 확산되게 된다. 그런데, 상기와 같은 종래의 면광원 장치는 상기 발광수단(25)의 램프(25a)로부터 조사된 광이 도광판(21)의 측면(21a)를 감싸고 있는 반사판부재(25b)에 반사되어 도광판(21)의 측면으로 입사되는데, 상기 도광판(21a)의 측면(21a)과 대향되는 측의 부위의 반사판 부재(25b)부터 반사된 광의 일부분이 램프 방향으로 정반사되어 램프의 외표면에서 흡수되므로 도광판의 상면 또는 하면으로 입사되는 광량이 적어 램프(25a)로부터 조사된 광의 이용효율을 향상시킬 수 없는 문제점이 내재되어 있으며, 결과적으로 배면광원 장치의 발광휘도가 저하되는 문제점이 내재되어 있었다.In the conventional surface light source device configured as described above, the light irradiated from the lamp 25a of the light emitting means is irradiated to the light guide plate 21, and the light irradiated to the light guide plate 21 is diffused on the front surface of the reflecting plate 22 provided thereon. It spreads to the front surface through the plate 23. However, in the conventional surface light source device as described above, the light irradiated from the lamp 25a of the light emitting means 25 is reflected by the reflecting plate member 25b surrounding the side surface 21a of the light guide plate 21 so that the light guide plate 21 may be used. Is incident on the side surface of the light guide plate 21a so that a part of the light reflected from the reflecting plate member 25b on the side of the side opposite to the side surface 21a of the light guide plate 21a is specularly reflected in the lamp direction and absorbed from the outer surface of the lamp. In other words, there is a problem in that the amount of light incident on the lower surface cannot be improved, so that the utilization efficiency of the light irradiated from the lamp 25a cannot be improved.
본 발명은 상기 문제점을 해결하기 위하여 창출된 것으로, 램프로부터 조사도니 고아이 반사판부재에 의해 램프 방향으로 정반사되는 광량을 최소화함으로써 도광판으로 입사되는 광량을 증대시켜 그 발광휘도를 향상시킬 수 있는 면광원 장치를 제공함에 그 목적이 있다.The present invention has been made to solve the above problems, by minimizing the amount of light specularly reflected from the lamp toward the lamp by the go-eye reflecting plate member to increase the amount of light incident on the light guide plate to improve its luminous brightness The object is to provide a device.
상기 목적을 달성하기 위하여 본 발명은, 도광판과, 이 도광판의 적어도 일측면에 설치되어 도광판으로 광을 조사하는 램프와, 이 램프를 감싸는 반사판 부재를 구비하여 된 면광원 장치에 있어서, 상기 반사판 부재와 대향하는 램프의 표면 부위에 설치된 광확산수단을 구비하여 된 것을 그 특징으로 한다.In order to achieve the above object, the present invention provides a surface light source device comprising a light guide plate, a lamp provided on at least one side of the light guide plate to irradiate light to the light guide plate, and a reflecting plate member surrounding the lamp. And light diffusing means provided on a surface portion of the lamp facing the lamp.
이하 첨부된 도면을 참조하여 본 발명에 따른 한 바람직하 실시예를 상세하게 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
본 발명에 따른 면광원 장치는 제3도 및 제4도에 도시된 바와 같이 판상의 도광판(31)과, 이 도광판(31)의 적어도 일측면에 고정되어 도광판(31)에 광을 조사하는 발광수단(40)과, 상기 도광판(31)의 하면과 상면에 각각 설치된 반사판(32)과 확산판(33)을 구비하여 구성된다. 상기 발광수단(40)은 제3도에 도시된 바와같이 도광판(31)의 측면(31a)과 인접되게 설치된 램프(42)와, 상기 측면과 대향되는 부위를 제외한 부위를 감사 상기 램프(42)로부터 조사된 광을 도광판(31) 측으로 반사시키는 커버부재(43)를 구비하여 구성되는데, 이 커버부재(43)의 내표면에는 반사율이 매우 높은 반사층(43a)이 형성된다. 그리고 램프(42)의 표면에는 본 발명의 특징에 따라 광확산수단(50)인 광확산판이 설치되는데, 이 광확산판은 상기 커버부재(43)와 대향되는 램프의 외면에 형성함이 바람직하다. 즉, 램프로부터 커버부재로 조사된 광중 일부를 다시 램프 쪽으로 정반사 시키는 커버부재의 영역과 대응되는 부위의 램프(42) 표면에 광확산 수단을 설치함이 바람직하다. 이때에 상기 광확산판(51)은 굴절율이 1보다 큰 물질로 코팅하고나 시트(sheet)화된 광확산판을 테이핑하여 형성하여도 무방하다.In the surface light source device according to the present invention, as shown in FIGS. 3 and 4, the plate-shaped light guide plate 31 is fixed to at least one side of the light guide plate 31 and emits light to irradiate light to the light guide plate 31. It comprises a means 40, a reflecting plate 32 and a diffusion plate 33 provided on the lower surface and the upper surface of the light guide plate 31, respectively. As illustrated in FIG. 3, the light emitting unit 40 includes a lamp 42 installed adjacent to the side surface 31a of the light guide plate 31 and an area except for a portion facing the side surface of the light guide plate 31. The cover member 43 which reflects the light irradiated from the light guide plate 31 side is comprised, The reflective surface 43a with a very high reflectance is formed in the inner surface of this cover member 43. As shown in FIG. In addition, a light diffusing plate, which is light diffusing means 50, is installed on the surface of the lamp 42, and the light diffusing plate is preferably formed on the outer surface of the lamp facing the cover member 43. . That is, it is preferable to provide a light diffusing means on the surface of the lamp 42 at a portion corresponding to the area of the cover member for specularly reflecting a part of the light irradiated from the lamp to the cover member back toward the lamp. In this case, the light diffusion plate 51 may be formed by coating with a material having a refractive index greater than 1 or by taping a sheet-shaped light diffusion plate.
이와같이 구성된 본 발명에 따른 명광원 장치의 작용을 설명하면 다음과 같다.Referring to the operation of the light source device according to the invention configured as described above are as follows.
본 발명에 따른 면광원 장치로부터 광을 전면으로 조사하기 위해서 램프(42)를 점등시킨다. 이와같이 하면 상기 램프(42)로부터 조사되는 광은 도광판(31)을 통하여 입사된 후 도광판(31)의 하면에 형성된 반사판(32)의해 반사되거나 상기 확산판(33)에 의해 확산되어 전면으로 조사되게 된다. 이때에 상기 램프(42)로부터 조사도니 광중 도광판의 상면으로 빛이 조사되기 위해서는 도광판(31)의 상면 또는 하면으로 반사되어야 한다. 그런데, 상기 램프(42)로부터 조사된 광중 일부가 램프 커버에 의해 정반사되어 램프의 외표면에서 흡수되어 도광판으로 조사되지 못하게 되는데, 상기 램프(42)의 외주면에는 광확산수단(50)이 설치되어 있으므로 램프(42)롭루터 조사된 광이 램프커버로 확산되어 램프 커버에서 광원으로 직접 정반사되는 광을 최소화 할 수 있다.The lamp 42 is turned on in order to irradiate light to the front from the surface light source device according to the present invention. In this way, the light irradiated from the lamp 42 is incident through the light guide plate 31 and then reflected by the reflection plate 32 formed on the bottom surface of the light guide plate 31 or diffused by the diffusion plate 33 to be irradiated to the front surface. do. At this time, in order to irradiate the light from the lamp 42 to the upper surface of the light guide plate of the irradiated crucible light, it must be reflected to the upper or lower surface of the light guide plate 31. However, some of the light irradiated from the lamp 42 is reflected by the lamp cover to be absorbed by the outer surface of the lamp and is not irradiated to the light guide plate, the light diffusion means 50 is provided on the outer peripheral surface of the lamp 42 Therefore, the light irradiated onto the lamp 42 may be diffused to the lamp cover to minimize the light directly reflected from the lamp cover to the light source.
따라서 램프(42)로부터 조사된 광의 일부가 직접 램프 방향으로 반사되는 광의 손실을 줄일 수 있으며, 나아가서는 도광판의 전면으로 확산되는 광의 발광휘도를 향상시킬 수 있는 있다.Therefore, a part of the light irradiated from the lamp 42 can directly reduce the loss of light reflected in the direction of the lamp, and further improve the luminous luminance of the light diffused to the front surface of the light guide plate.
이상에서 설명한 바와같이 본 발명 면광원 장치는 램프로부터 조사되는 광의 이용효율을 대폭 향상시킬 수 있으며, 나아가서는 액정표시 소자등의 배면광원 장치로 광이용효율을 대폭 향상시킬 수 있는 이점을 가진다.As described above, the surface light source device of the present invention can greatly improve the use efficiency of the light irradiated from the lamp, and furthermore, the back light source device such as a liquid crystal display device has an advantage of greatly improving the light utilization efficiency.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940033115A KR100307446B1 (en) | 1994-12-07 | 1994-12-07 | Surface light source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940033115A KR100307446B1 (en) | 1994-12-07 | 1994-12-07 | Surface light source device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR960024562A KR960024562A (en) | 1996-07-20 |
| KR100307446B1 true KR100307446B1 (en) | 2001-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019940033115A KR100307446B1 (en) | 1994-12-07 | 1994-12-07 | Surface light source device |
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| Country | Link |
|---|---|
| KR (1) | KR100307446B1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6843587B2 (en) | 2002-05-11 | 2005-01-18 | Ls Tech Co., Ltd. | Surface light source apparatus, and method and apparatus for manufacturing the same |
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1994
- 1994-12-07 KR KR1019940033115A patent/KR100307446B1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR960024562A (en) | 1996-07-20 |
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