KR100421900B1 - back light of liquid grystal display device - Google Patents

back light of liquid grystal display device Download PDF

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Publication number
KR100421900B1
KR100421900B1 KR1019970013073A KR19970013073A KR100421900B1 KR 100421900 B1 KR100421900 B1 KR 100421900B1 KR 1019970013073 A KR1019970013073 A KR 1019970013073A KR 19970013073 A KR19970013073 A KR 19970013073A KR 100421900 B1 KR100421900 B1 KR 100421900B1
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South Korea
Prior art keywords
light
guide plate
light guide
liquid crystal
backlight
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KR1019970013073A
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Korean (ko)
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KR19980076384A (en
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김정재
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엘지.필립스 엘시디 주식회사
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Priority to KR1019970013073A priority Critical patent/KR100421900B1/en
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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
    • 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
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides

Abstract

PURPOSE: A backlight for an LCD(Liquid Crystal Display) is provided to easily adjust luminance and save cost. CONSTITUTION: A light guide plate(21) equalizes a white light radiated to a lower glass throughout the entire region. A plurality of discontinuous light emitting elements(22a) are closely allocated from a central portion to an edge portion at both sides or one side of the light guide plate(21). A plurality of the discontinuous light emitting elements(22a) radiate the white light to the light guide plate(21). A plurality of the discontinuous light emitting elements(22a) are formed as LEDs(Light Emitting Diodes)(22). Each of the LEDs(22) simultaneously emits RGB colors and radiates the white light.

Description

액정표시장치의 백라이트{back light of liquid grystal display device}Back light of liquid grystal display device

본 발명은 액정표시장치에 관한 것으로서, 특히 휘도조절이 용이하고 코스트를 절감시키는데 적당하도록 한 액정표시장치의 백라이트에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a backlight of a liquid crystal display device which is easy to adjust luminance and is suitable for reducing cost.

일반적으로 액정표시장치(LCD : Liquid Crystal Display)는 그 자체가 비발광성이기 때문에 어두운곳에서는 사용이 불편하다.In general, liquid crystal displays (LCDs) are inherently non-luminous and thus inconvenient to use in dark places.

따라서 보기 쉽고 어두운곳에서의 사용이 가능하게 할 목적으로 표시면을 균일하게 면조사하는 백라이트(backlight)가 개발되었다.Therefore, a backlight for uniformly irradiating the display surface has been developed for the purpose of making it easy to see and use in a dark place.

액정표시장치의 시인성은 주변광의 밝기에 따라 변하고 반사형 액정에서의 시인성은 주위광에 크게 좌우되지만, 백라이트를 사용하는 투과형 액정표시장치에서는 배면조사로 인해 저레벨의 주변광에도 시인성은 저하되지 않는다.The visibility of the liquid crystal display device varies depending on the brightness of the ambient light, and the visibility of the reflective liquid crystal depends greatly on the ambient light. However, in the transmissive liquid crystal display device using the backlight, visibility is not deteriorated even at low level ambient light due to the backside illumination.

보통, 백라이트는 전구나 형광등을 광원으로 하고 반사재나 도광체를 조합시켜 균일한 조명을 얻는 것이다.In general, the backlight is a light bulb or a fluorescent lamp as a light source, and a uniform illumination is obtained by combining a reflector or a light guide.

이러한 백라이트의 요구성능으로서는 박형, 고휘도 및 저코스트를 요구한다.As the required performance of such a backlight, thinness, high brightness and low cost are required.

최근, 액정표시장치의 진전과 함께 백라이트의 요구성능또한 고도화되고 조명용 램프의 개발을 위한 많은 노력이 계속되고 있다.Recently, with the progress of the liquid crystal display device, the required performance of the backlight is also advanced, and many efforts have been made for the development of the lighting lamp.

일반적으로 백라이트에 이용되는 조명광원은 액정표시장치의 크기, 사용목적에 따라 적당히 선택하여야 한다.In general, the illumination light source used for the backlight should be appropriately selected according to the size and purpose of the liquid crystal display device.

이를 형태별로 구분하면 백열전구, 백색 할로겐(halogen)램프등의 점광원과, 형광램프(열음극, 냉음극)등의 선광원 등이 있다.The light sources such as incandescent lamps, white halogen lamps, and linear light sources such as fluorescent lamps (hot cathodes and cold cathodes) are classified into these types.

백라이트는 광원의 배치에 따라 에지식과 직하식으로 크게 구분된다.The backlight is classified into an edge type and a direct type according to the arrangement of the light source.

에지식은 에지식은 가장자리부에 선광원인 형광램프를 배치, 특수설계된 굴곡율을 가진 반사체와 확산판늘 조합시키거나 혹은 쿠명성이 우수한 도광체의 반사굴곡율을 설계하여 표시면 휘도의 균일화를 도모하는 방법이다.Edge type Edge type Fluorescent lamp which is a line light source at the edge is combined with a reflector with specially designed bend rate and diffuser, or by designing the reflective curvature of the light guide with excellent clarity to achieve uniform display brightness to be.

그리고 직하식은 표시면의 바로 아래 한 개 또는 복수개의 광원을 배치하여 얼룩을 적게 하기 위한 것으로서 광량제어용 필름을 광확산판 아래에 설치하거나 확산재를 통해 얼룩을 적게하고자 하는 방법이다.In addition, the direct method is to place one or a plurality of light sources directly below the display surface to reduce spots, and is a method of installing a film for light quantity control under a light diffusion plate or to reduce spots through a diffuser.

이하, 종래 액정표시장치의 백라이트를 첨부된 도면을 참조하여 설명하면 다음과 같다.Hereinafter, a backlight of a conventional liquid crystal display device will be described with reference to the accompanying drawings.

도 1은 종래기술에 따른 액정표시장치의 백라이트를 나타낸 사시도이다.1 is a perspective view illustrating a backlight of a liquid crystal display according to the related art.

도 1에 도시한 바와같이 종래 액정표시장치의 백라이트는 도광판(11)과, 상기 도광판(11)의 양측에 배치되는 램프(12)와, 상기 램프(12)를 외부로부터 보호하기 위한 하우징(housing)(13)을 포함하여 구성된다.As shown in FIG. 1, a backlight of a conventional liquid crystal display device includes a light guide plate 11, a lamp 12 disposed on both sides of the light guide plate 11, and a housing for protecting the lamp 12 from the outside. 13).

여기서 상기 도광판(11)에는 도광판(11)전면에 걸쳐 균일한 휘도를 유지하기 위한 무늬 프린팅패턴 또는 무늬가공을 한다.Here, the light guide plate 11 is a pattern printing pattern or pattern processing for maintaining a uniform brightness over the entire light guide plate (11).

그리고 상기 하우징(13)은 램프(12)로부터 조사되는 빛의 집광을 위해 그 내부면이 반사막의 역할을 한다.In addition, the housing 13 serves as a reflective film for condensing light emitted from the lamp 12.

이러한 무늬가공은 전술한 바와같이 도광판(11)의 전면에 걸쳐 휘도의 균일성을 위해 실시하는데 램프(12)에 근접되는 부분의 도광판(11)에는 무늬 프린팅패턴의 사이즈가 크고, 상기 램프(12)로부터 멀어지는 부분 즉, 도광판(11)의 중심부분에는 무늬 프린팅패턴의 사이즈가 작을 뿐만 아니라 조밀도에서 있어서도 근접부분에 비해 더 조밀하다.Such pattern processing is performed for uniformity of brightness over the entire surface of the light guide plate 11 as described above. The size of the pattern printing pattern is large in the light guide plate 11 of the portion adjacent to the lamp 12, and the lamp 12 In the center part of the light guide plate 11, i.e., the pattern printing pattern is not only small in size but also more dense than the neighboring part in density.

이와같이 구성된 백라이트는 액정표시장치의 하판글래스 배면에 설치되어 균일한 휘도가 유지되는 화면 디스플레이를 위하여 사용된다.The backlight configured as described above is used for the screen display which is installed on the bottom glass of the liquid crystal display and maintains uniform brightness.

현재, 소형화 경량화, 박형화 추세에 있는 액정표시장치에서 백라이트 역시 그 구조가 컴팩트(compact)해져 패널부, 회로부와 백라이트를 밀착하는 형태로 이루어진다.At present, the backlight of the liquid crystal display device which is in the trend of miniaturization, light weight, and thinness is also compact, and has a form in which the panel unit, the circuit unit, and the backlight are closely attached to each other.

그러나 이와같은 종래 액정표시장치의 백라이트는 다음과 같은 문제점이 있었다.However, the backlight of the conventional liquid crystal display device has the following problems.

첫째, 램프타입의 광원을 사용하므로 제품설계시 램프의 길이등의 사이즈 제한이 요구된다.First, since the lamp type light source is used, size restrictions such as the length of the lamp are required when designing the product.

둘째, 램프를 보호하기 위한 하우징이 필요하고 광집속을 위해 하우징의 내부면을 리플렉터(reflector)처리를 해야한다.Secondly, a housing is needed to protect the lamp and the inner surface of the housing must be reflectored for light focusing.

셋째, 도광판의 휘도 균일성을 유지하기 위해 도광판의 밑면에 무늬 프린팅이나 무늬가공을 해야하므로 공정이 복잡하다.Third, in order to maintain the uniformity of the brightness of the light guide plate, a process of printing or patterning the bottom surface of the light guide plate is complicated.

넷째, 램프 자체의 설계 및 제작이 어렵고 가격이 고가이다.Fourth, the design and manufacture of the lamp itself is difficult and expensive.

본 발명은 상기의 문제점을 해결하기 위해 안출한 것으로서 휘도조절이 용이하고 무늬가공등의 공정이 불필요하여 제작이 용이하며 코스트를 절감시키는데 적당한 액정표시장치의 백라이트를 제공하는데 그 목적이 있다.The present invention has been made to solve the above problems, and an object thereof is to provide a backlight of a liquid crystal display device that is easy to control brightness, does not require a process such as pattern processing, and is easy to manufacture and to reduce cost.

도 1은 종래기술에 따른 액정표시장치의 백라이트를 나타낸 사시도이다.1 is a perspective view illustrating a backlight of a liquid crystal display according to the related art.

도 2는 본 발명에 따른 액정표시장치의 백라이트를 나타낸 사시도이다.2 is a perspective view illustrating a backlight of the liquid crystal display according to the present invention.

도 3은 본 발명에 따른 불연속 발광소자부를 나타낸 도면3 is a view showing a discontinuous light emitting device according to the present invention;

도 4는 본 발명에 따른 불연속 발광소자부의 LED를 나타낸 도면4 is a view showing the LED of the discontinuous light emitting device unit according to the present invention;

도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings

21 : 도광판22 : LED(Light Emitting Diode)21: LGP 22: LED (Light Emitting Diode)

22a : 불연속발광소자부31 : PCB기판22a: discontinuous light emitting element portion 31: PCB substrate

41 : 커버42 : 렌즈41: cover 42: lens

상기한 목적을 달성하기 위한 본 발명의 액정표시장치의 백라이트는 액정표시소자의 하판글래스의 배면에서 백색광을 조사하는 백라이트에 있어서, 상기 하판글래스로 조사되는 백색광이 전영역에 걸쳐 균일하도록 하는 도광판과, 상기 도광판의 양측 또는 일측에 배치되어 도광판으로 백색광을 조사하는 복수개의 불연속발광소자를 포함하여 구성된다.In the backlight of the liquid crystal display device of the present invention for achieving the above object is a light guide plate for irradiating white light from the bottom of the bottom glass of the liquid crystal display device, the light guide plate for uniform white light irradiated over the entire area and And a plurality of discontinuous light emitting devices disposed on both sides or one side of the light guide plate to irradiate white light to the light guide plate.

이하, 본 발명에 따른 액정표시장치의 백라이트를 첨부된 도면을 참조하여설명하면 다음과 같다.Hereinafter, the backlight of the liquid crystal display according to the present invention will be described with reference to the accompanying drawings.

도 2는 본 발명에 따른 액정표시장치의 백라이트를 나타낸 사시도이다.2 is a perspective view illustrating a backlight of the liquid crystal display according to the present invention.

본 발명의 백라이트는 도 2에 도시한 바와같이 도광판(21)과, 상기 도광판(21)의 양측에 배치되어 빛을 발산하는 복수개의 LED(22)로 이루어진 불연속발광소자부(22a)를 포함하여 구성된다.As shown in FIG. 2, the backlight of the present invention includes a light guide plate 21 and a discontinuous light emitting device portion 22a disposed on both sides of the light guide plate 21 and configured to emit light. It is composed.

여기서 상기 불연속발광소자부(22a)는 도광판(21)의 휘도의 균일성을 유지하기 위하여 각각의 LED(22)들간의 간격을 조절하게 되는데 상기 불연속발광소자부(22a)의 중앙부는 그 간격을 넓게하고 그 양측의 가장자리 부분으로 갈수록 그 간격을 좁게 구성한다.Here, the discontinuous light emitting device portion 22a adjusts the spacing between the LEDs 22 in order to maintain the uniformity of the brightness of the light guide plate 21. The center portion of the discontinuous light emitting device portion 22a is used to adjust the spacing. The wider and narrower the gap toward the edges on both sides.

상기 불연속발광소자부(22a)를 보다 상세히 설명하면 다음과 같다.The discontinuous light emitting device portion 22a will be described in more detail as follows.

도 3은 본 발명에 따른 불연속발광소자부를 도시한 것으로서 PCB기판(31)에 복수개의 LED(22)를 구성한다.3 shows a discontinuous light emitting device portion according to the present invention and constitutes a plurality of LEDs 22 on a PCB substrate 31.

이때 상기 LED(22)는 PCB(Printed Circuit Board)기판(31)의 양측으로 갈수록 조밀하게 배치하고 중앙부분으로 갈수록 그 간격을 넓게 배치한다.At this time, the LED 22 is arranged densely toward both sides of the PCB (Printed Circuit Board) substrate 31, and the interval is wider toward the center portion.

여기서, PCB기판(31)에 배치된 LED(22)는 도 4에 도시한 바와같이 LED(도면에 도시되지 않음)와, 외부의 충격으로부터 LED를 보호하기 위한 LED커버(41)와, 그리고 렌즈(42)를 포함하여 구성된다.Here, the LED 22 disposed on the PCB substrate 31 is an LED (not shown in the figure), an LED cover 41 for protecting the LED from external shocks, and a lens as shown in FIG. And (42).

그리고 하나의 LED에는 R(적), G(녹), B(청)칼라를 발광하는 발광소자가 구성되어 상기 3색이 동시에 발광하게 되어 최종적으로 백색광을 발광한다.One LED is provided with a light emitting device that emits R (red), G (green), and B (blue) colors so that the three colors emit light simultaneously, thereby finally emitting white light.

백라이트에서 필요한 광은 백색광이므로 상기와 같이 R, G, B 3색의 광을 동시에 발광시켜 백색광만을 얻는다.Since the light required in the backlight is white light, the light of R, G, and B colors is simultaneously emitted as described above, so that only white light is obtained.

이와같이 구성된 본 발명에 따른 액정표시장치의 백라이트는 도광판(21)의 양측에 배치된 불연속발광소자부(22a)로부터 발광되는 백색광 도광판으로 입시시키게 된다.The backlight of the liquid crystal display according to the present invention configured as described above enters the white light guide plate emitted from the discontinuous light emitting element portion 22a disposed at both sides of the light guide plate 21.

이때 백색광이 상기 도광판(21)전면에 걸쳐 균일성을 갖도록 하기위해서 각 LED간의 간격을 조절하여 배치한다.At this time, in order to have white light uniformity over the entire surface of the light guide plate 21 is arranged by adjusting the interval between each LED.

이상 상술한 바와같이 본 발명에 따른 액정표시장치의 백라이트는 다음과 같은 효과가 있다.As described above, the backlight of the liquid crystal display according to the present invention has the following effects.

첫째, 도광판에서 휘도의 균일성을 유지하기 위해 별도의 무늬가공 공정이 필요치 않아 공정이 간단하다.First, in order to maintain the uniformity of brightness in the light guide plate, a separate pattern processing process is not necessary, so the process is simple.

둘째, LED의 간격을 조절하여 휘도의 균일성을 유지하므로 휘도조절이 용이하다.Second, it is easy to adjust the brightness by adjusting the interval of the LED to maintain the uniformity of the brightness.

셋째, 가격이 저렴하고 내구성이 강하다.Third, the price is low and the durability is strong.

Claims (5)

액정표시장치의 하판글래스의 배면에서 백색광을 조사하는 백라이트에 있어서,In the backlight for irradiating white light from the bottom of the glass plate of the liquid crystal display device, 상기 하판글래스로 조사되는 백색광이 전영역에 걸쳐 균일하도록 하는 도광판과,A light guide plate for uniforming the white light irradiated with the lower plate glass over the entire area; 상기 도광판의 양측 또는 일측에 중앙부에서 가장자리부분으로 갈수록 조밀하게 배치되어 도광판으로 백색광을 조사하는 복수개의 불연속발광소자를 포함하여 구성되는 것을 특징으로 하는 액정표시장치의 백라이트.And a plurality of discontinuous light emitting devices disposed on both sides or one side of the light guide plate toward the edge part of the light guide plate to irradiate white light to the light guide plate. 제 1 항에 있어서,The method of claim 1, 상기 불연속발광소자는 LED인 것을 특징으로 하는 액정표시장치의 백라이트.The discontinuous light emitting device is a backlight of the liquid crystal display device, characterized in that the LED. 제 2 항에 있어서,The method of claim 2, 상기 단위LED는 적, 녹, 청의 3색을 동시에 발광하여 백색광을 조사하는 것을 특징으로 하는 액정표시장치의 백라이트.The unit LED backlight of the liquid crystal display device, characterized in that to emit white light by emitting three colors of red, green, blue at the same time. 제 2 항에 있어서,The method of claim 2, 상기 도광판의 휘도가 균일하도록 조절하기 위하여 상기 LED간격을 조절하는 것을 특징으로 하는 액정표시장치의 백라이트.And controlling the LED spacing to adjust the brightness of the light guide plate to be uniform. 제 3 항에 있어서,The method of claim 3, wherein 상기 단위LED는 외부의 충격으로부터 보호하기 위한 커버가 구성되는 것을 특징으로 하는 액정표시장치의 백라이트.The unit LED backlight of the liquid crystal display device, characterized in that the cover is configured to protect from external impact.
KR1019970013073A 1997-04-09 1997-04-09 back light of liquid grystal display device KR100421900B1 (en)

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