KR20030042281A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
KR20030042281A
KR20030042281A KR1020010073001A KR20010073001A KR20030042281A KR 20030042281 A KR20030042281 A KR 20030042281A KR 1020010073001 A KR1020010073001 A KR 1020010073001A KR 20010073001 A KR20010073001 A KR 20010073001A KR 20030042281 A KR20030042281 A KR 20030042281A
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KR
South Korea
Prior art keywords
liquid crystal
light
crystal display
crystal panel
display device
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KR1020010073001A
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Korean (ko)
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이승준
홍영기
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엘지.필립스 엘시디 주식회사
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Priority to KR1020010073001A priority Critical patent/KR20030042281A/en
Publication of KR20030042281A publication Critical patent/KR20030042281A/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
    • G02B6/0013—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
    • 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
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133317—Intermediate frames, e.g. between backlight housing and front frame

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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)
  • Liquid Crystal (AREA)

Abstract

PURPOSE: A liquid crystal display device is provided to reduce the gap between liquid crystal panels and optical sheets in an incident part for improving the wrinkling of the optical sheets, thereby preventing the bending of light path caused by the wrinkles and making the luminance of a screen uniform. CONSTITUTION: A liquid crystal display device includes a backlight in which an incident part and a non-incident part have different distances between liquid crystal display panels(41) and optical sheets(46). The distance(0.1mm or less) of the incident part is smaller than the distance of the non-incident part. The optical sheets are to be a diffusion sheet and a prism sheet.

Description

액정표시장치{Liquid Crystal Display Device}Liquid Crystal Display Device

본 발명은 액정표시장치에 관한 것으로, 특히 백라이트를 구비한 액정표시장치에 관한 것이다.The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a backlight.

최근들어, 평판표시소자에 대한 연구가 활발한데, 그 중에서 각광받고 있는 것으로 액정표시장치(LCD;Liquid Crystal Display Device), FED(Field Emission Display Device), ELD(Electro-luminescence Display Device), PDP(Plasma Display Panels) 등이 있다.In recent years, research on flat panel display devices has been actively conducted, and among them, liquid crystal display devices (LCDs), field emission display devices (FEDs), electro-luminescence display devices (ELDs), and PDPs (PDPs) Plasma Display Panels).

이 중, 액정표시장치는 콘트라스트 비(contrast ratio)가 크고, 계조 표시나 동화상 표시에 적합하며 전력소비가 적다는 특징 때문에 노트북 PC, 데스크탑 모니터, 및 액정TV로 그 영역이 확대되고 있는 추세이다.Among these, liquid crystal display devices have a large contrast ratio, are suitable for gray scale display or moving image display, and have low power consumption. Therefore, the area of the liquid crystal display device has been expanded to notebook PCs, desktop monitors, and liquid crystal TVs.

하지만, 상기 액정표시장치는 그 자체가 비발광성이므로 빛을 조사하기 위한 별도의 외부광원이 필요하다. 특히, 투과형 액정표시장치의 경우 LCD 패널의 배면에 광을 발산하고 안내하는 별도의 조광장치, 즉 백라이트 장치가 반드시 필요하다.However, since the liquid crystal display itself is non-luminescent, a separate external light source for irradiating light is required. In particular, in the case of a transmissive liquid crystal display, a separate dimming device that emits light and guides the back of the LCD panel is necessary.

상기 백라이트(back light)는 직하형(直下型)부터 에지 라이트(edge light)방식까지 다양한데, 에지 라이트 방식이 주류를 이루고 있다.The backlight (back light) varies from a direct type (edge type) to an edge light (edge light) method, the edge light method is the mainstream.

이 중, 에지 라이트 방식은 액정패널의 측면에 형광 램프(열음극, 냉음극)등의 관형상의 선광원을 설치하고, 투명한 도광판을 이용하여 형광 램프로부터의 광을 액정패널 화면 전체에 투사시키는 방식이다.Among these, the edge light method is a method in which tubular line light sources such as fluorescent lamps (hot cathode and cold cathode) are provided on the side of the liquid crystal panel, and the light from the fluorescent lamp is projected onto the entire liquid crystal panel screen using a transparent light guide plate. to be.

이하, 첨부된 도면을 참조하여 종래 기술에 따른 액정표시장치를 설명하면 다음과 같다.Hereinafter, a liquid crystal display according to the related art will be described with reference to the accompanying drawings.

도 1은 일반적인 액정패널을 나타낸 단면도이고, 도 2는 종래 기술에 의한 액정표시장치의 단면도이다.1 is a cross-sectional view of a general liquid crystal panel, and FIG. 2 is a cross-sectional view of a conventional liquid crystal display device.

먼저, 액정표시장치를 구성하는 기본적인 소자인 액정패널을 살펴보면 다음과 같다.First, a liquid crystal panel which is a basic element constituting the liquid crystal display device will be described.

도 1에서와 같이, 액정패널은 색상구현을 위한 컬러필터층(112)이 형성된 상부기판(101)과, 액정분자의 배열 방향을 변환시킬 수 있는 스위칭 소자가 형성된 하부기판(102)과, 상기 상,하부 기판(101,102) 사이에 형성된 액정층(100)으로 구성된다.As shown in FIG. 1, the liquid crystal panel includes an upper substrate 101 on which a color filter layer 112 for color realization is formed, a lower substrate 102 on which a switching element capable of converting an arrangement direction of liquid crystal molecules, and the upper substrate 101 are formed. The liquid crystal layer 100 is formed between the lower substrates 101 and 102.

상기 상부기판(101)에는 상기 컬러필터층(112) 외에 빛샘을 차단하는 블랙 매트릭스(111)와 액정층(100)에 전압을 인가하는 제 1 전극인 공통전극(113)이 더 형성되어 있으며, 상기 하부기판(102)에는 상기 스위칭 소자인 박막트랜지스터(121) 외에 상기 박막트랜지스터로부터 신호를 인가받고 액정층(100)에 전압을 인가하는 제 2 전극인 화소전극(122)이 더 형성되어 있다.In addition to the color filter layer 112, the upper substrate 101 further includes a black matrix 111 that blocks light leakage and a common electrode 113 that is a first electrode that applies a voltage to the liquid crystal layer 100. In addition to the thin film transistor 121 that is the switching element, the lower substrate 102 further includes a pixel electrode 122 that is a second electrode that receives a signal from the thin film transistor and applies a voltage to the liquid crystal layer 100.

그리고, 상기 상,하부 기판(101,102) 사이에는 두 기판의 간격을 일정하게 유지하기 위한 스페이서(115)가 삽입되어 있고, 기판의 가장자리에는 액정이 외부로 흐르는 것을 방지하기 위한 실런트(sealant)(116)가 형성되어 있다.In addition, a spacer 115 is inserted between the upper and lower substrates 101 and 102 to maintain a constant gap between the two substrates, and a sealant 116 is provided at the edge of the substrate to prevent liquid crystals from flowing to the outside. ) Is formed.

이와 같은 액정패널에 광을 제공하기 위한 광원이 필요한데, 상기 액정패널이 투과형, 반투과형인 경우 액정패널 하면에 백라이트가 더 장착된다.A light source for providing light to such a liquid crystal panel is required. When the liquid crystal panel is a transmissive or semi-transmissive type, a backlight is further mounted on the lower surface of the liquid crystal panel.

즉, 일반적인 액정표시장치는 도 2의 액정패널(1)과, 상기 액정패널(1)의 상,하면에 각각 부착된 편광판(2)과, 상기 액정패널(1)과의 갭이 전면에 대해 일정하도록 장착되어 액정패널(1)에 광을 투사시키는 백라이트와, 상기 액정패널과 백라이트를 지지해주는 케이스(3)와, 상기 케이스(3) 외부에 부착되어 화상이 표시되는 유효면적을 제외한 가장자리에 둘러싼 스텐레스 스틸 재질의 베젤(bezel)부(4)로 구성된다.That is, in the general liquid crystal display device, a gap between the liquid crystal panel 1 of FIG. 2, the polarizing plates 2 attached to the upper and lower surfaces of the liquid crystal panel 1, and the liquid crystal panel 1 is provided with respect to the entire surface thereof. Mounted to be constant to project light onto the liquid crystal panel 1, a case 3 supporting the liquid crystal panel and the backlight, and an edge of the case 3 attached to the outside of the case 3 except for an effective area where an image is displayed. It consists of a bezel (4) of surrounding stainless steel material.

상기 백라이트의 광원인 램프(11)는 액정패널 하부의 에지 부분에 장착되는데, 고휘도가 요구되는 모니터용이나 TV용 액정표시장치일 경우에는 에지 부분에 2개 이상의 램프가 장착되기도 한다.The lamp 11, which is a light source of the backlight, is mounted at the edge portion of the lower part of the liquid crystal panel. In the case of a liquid crystal display device for a monitor or a TV requiring high brightness, two or more lamps may be mounted at the edge part.

구체적으로, 상기 백라이트는 액정패널(1)의 좌측 또는 우측에 설치되어 광을 제공하는 램프(11)와, 상기 램프(11)를 고정시켜줌과 동시에 램프에서 나온 빛을 도광판(13)으로 집속시켜주는 램프하우징(12)과, 상기 램프(11)로부터 발광된 빛을 백라이트 상부의 액정패널(1)로 공급해 주는 도광판(13)과, 상기 도광판(13) 하부에 부착되어 액정패널 반대쪽으로 새어나오는 빛을 도광판(13)으로 반사시켜 주는 반사판(14)과, 상기 도광판(13) 상부에 위치하여 도광판(13)에서 나온 빛을 균일하게 확산시켜 주는 확산시트(15)와, 상기 확산시트(15) 상부에 위치하여 상기 확산부에서 확산시킨 빛을 집광시켜 액정패널로 전달하는 프리즘 시트(16)와, 상기 프리즘 시트(16) 상부에서 프리즘 시트(16)를 보호하는 보호시트(17)와, 상기 구성 요소들을 수납하여 고정시켜주는 메인 지지대(18)로 구성된다.Specifically, the backlight is installed on the left or right side of the liquid crystal panel 1 to provide the lamp 11 and the light, and to fix the lamp 11 at the same time to focus the light from the lamp to the light guide plate (13). The main body is attached to the lamp housing 12, the light guide plate 13 for supplying the light emitted from the lamp 11 to the liquid crystal panel 1 above the backlight, and is attached to the lower part of the light guide plate 13 and leaks out to the opposite side of the liquid crystal panel. A reflector 14 reflecting light to the light guide plate 13, a diffusion sheet 15 positioned on the light guide plate 13 to uniformly diffuse the light emitted from the light guide plate 13, and the diffusion sheet 15. A prism sheet 16 positioned at an upper portion and condensing the light diffused by the diffuser to be transmitted to the liquid crystal panel, a protective sheet 17 protecting the prism sheet 16 on the prism sheet 16; Main to receive and fix the components It is composed of a support (18).

이 때, 상기 확산시트(15)는 약 130 미크론의 두께를 가지며 양 측면에 확산입자가 코팅된 PET(폴리에틸렌 텔레프탈레이트) 시트를 사용하고, 프리즘 시트(16)는 약 170 미크론의 두께와 약 90도의 정각(apex angle)을 갖는 렌즈를 사용하는 것이 바람직하다.In this case, the diffusion sheet 15 has a thickness of about 130 microns and uses a PET (polyethylene telephthalate) sheet coated with diffusion particles on both sides, and the prism sheet 16 has a thickness of about 170 microns and about 90 microns. It is preferable to use a lens having an apex angle of degrees.

상기와 같이 램프(11)로부터 발하게 된 빛은 도광판(13) 입광부에 집광되어도광판을 거치고 확산시트(15), 프리즘 시트(16), 보호시트(17)를 차례로 거쳐 정보표시면에 전달된다.As described above, the light emitted from the lamp 11 is focused on the light receiving part of the light guide plate 13, and then passes through the light guide plate and then passes through the diffusion sheet 15, the prism sheet 16, and the protective sheet 17 to the information display surface. .

그런데, 상기 백라이트의 광원과 근접한 거리의 입광부에서의 광학시트류가 열에 의해 주름진다. 이 때 주름(wrinkle)은 액정패널과 백라이트 사이의 공간 높이만큼의 폭을 가지며, 이러한 주름에 의해 빛의 경로가 휘어져서 표시상에 어둡게 보이거나 밝게 보이는 등 화면 밝기가 불균일해진다.By the way, the optical sheets at the light incidence portion close to the light source of the backlight are wrinkled by heat. At this time, the wrinkles have a width equal to the height of the space between the liquid crystal panel and the backlight, and the screen paths become uneven due to the curved path of the light, which makes the screen dark or bright.

반면, 광원과 멀리 떨어진 반입광부에서는 리플(ripple)이 생기는데, 이러한 리플은 시트류 상부의 액정패널에 충격을 가하여 액정의 배향이 흔들리게 하여 배향 결함에 의한 표시상의 얼룩이 생기게 한다.On the other hand, a ripple occurs in the incident light part far from the light source. The ripple impacts the liquid crystal panel on the top of the sheets, causing the liquid crystal to shake, resulting in uneven display on the display.

여기서, 광학시트 류는 확산시트, 프리즘 시트, 보호시트 등 도광판(13)과 액정패널(1) 사이에 삽입되어 있는 시트들을 말한다.Here, the optical sheets refer to sheets inserted between the light guide plate 13 and the liquid crystal panel 1 such as a diffusion sheet, a prism sheet, and a protective sheet.

본 발명은 상기와 같은 문제점을 해결하기 위하여 안출한 것으로, 입광부와 반입광부에서의 액정패널과 시트류 사이의 갭을 조정함으로써 입광부에서의 시트류 주름을 개선하는 것을 특징으로 하는 액정표시장치를 제공하는데 그 목적이 있다.The present invention has been made to solve the above problems, the liquid crystal display device to improve the sheet wrinkles in the light incident portion by adjusting the gap between the liquid crystal panel and the sheet in the light incident portion and the light incident portion. The purpose is to provide.

도 1은 일반적인 액정패널을 나타낸 단면도.1 is a cross-sectional view showing a general liquid crystal panel.

도 2는 종래 기술에 의한 액정표시장치의 단면도.2 is a cross-sectional view of a liquid crystal display device according to the prior art.

도 3은 본 발명에 의한 액정표시장치의 단면도.3 is a cross-sectional view of a liquid crystal display device according to the present invention.

도 4는 본 발명의 제 1 실시예에 의한 액정표시장치의 단면도.4 is a cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention.

도 5는 본 발명의 제 2 실시예에 의한 액정표시장치의 단면도.5 is a cross-sectional view of a liquid crystal display device according to a second embodiment of the present invention.

도면의 주요 부분에 대한 부호설명Explanation of Signs of Major Parts of Drawings

51 : 광원 52 : 램프하우징51: light source 52: lamp housing

53 : 도광판 54 : 반사판53: Light guide plate 54: Reflector plate

55 : 확산시트 56 : 프리즘 시트55 diffusion sheet 56 prism sheet

57 : 보호시트 58 : 광학 시트류57: protective sheet 58: optical sheet

59 : 메인 지지대59: main support

상기와 같은 목적을 달성하기 위한 본 발명의 액정표시장치는 제 1 ,제 2 기판이 액정층을 사이에 두고 부착된 액정패널과, 상기 액정패널의 하부에 배치되어 광원과, 상기 광원 일측에 형성되어 광을 전달하는 도광판과, 상기 도광판 하부에 위치하는 반사판과, 상기 도광판 상부에 차례로 위치하는 적어도 하나 이상의 광학시트류와, 상기 요소를 수납하는 메인 지지대를 포함하는 백라이트로 구성된 액정표시장치에 있어서, 상기 백라이트 입광부에서의 액정패널과 광학시트류 사이의 거리가 반입광부에 비해 좁은 것을 특징으로 한다.The liquid crystal display device of the present invention for achieving the above object is a liquid crystal panel attached to the first and second substrates with a liquid crystal layer interposed therebetween, disposed under the liquid crystal panel, a light source, and formed on one side of the light source And a light guide plate for transmitting light, a reflecting plate positioned below the light guide plate, at least one or more optical sheets sequentially positioned above the light guide plate, and a backlight including a main support housing the elements. The distance between the liquid crystal panel and the optical sheets in the backlight incident part is narrower than that of the incident light part.

즉, 입광부에서의 액정패널과 광학 시트류 사이의 갭을 줄임으로써 입광부에서의 열에 의해 시트류가 주름지는 현상을 방지하고자 하는 것을 특징으로 한다.That is, by reducing the gap between the liquid crystal panel and the optical sheets in the light incidence portion, it is characterized in that it is intended to prevent the phenomenon that the sheets are wrinkled by the heat in the light incidence portion.

이하, 실시예에서는 입광부의 도광판 높이를 반입광부보다 높임으로써 액정패널과 시트류 사이의 갭을 조절한다.Hereinafter, in the embodiment, the gap between the liquid crystal panel and the sheets is adjusted by increasing the height of the light guide plate of the light incident portion than the light incident portion.

첨부된 도면을 참조하여 본 발명의 실시예에 의한 액정표시장치를 상세히 설명하면 다음과 같다.Hereinafter, a liquid crystal display according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 3은 본 발명에 의한 액정표시장치의 단면도이고, 도 4는 본 발명의 제 1 실시예에 의한 액정표시장치의 단면도이며, 도 5는 본 발명의 제 2 실시예에 의한 액정표시장치의 단면도이다.3 is a cross-sectional view of the liquid crystal display according to the present invention, FIG. 4 is a cross-sectional view of the liquid crystal display according to the first embodiment of the present invention, and FIG. 5 is a cross-sectional view of the liquid crystal display according to the second embodiment of the present invention. to be.

액정패널과 백라이트 사이의 갭이 입광부냐 반입광부냐에 따라 조금씩 다른 본 발명의 액정표시장치는 도 3에서와 같이, 매트릭스 상으로 화소가 배열되어 있는 박막트랜지스터 기판(48)과 컬러필터가 형성된 컬러필터 기판(49)이 액정층을 사이에 두고 부착된 액정패널(41)과, 상기 화소 각각에 전압을 인가하고 액정을 구동하기 위한 신호를 공급하는 드라이버 IC(Intergrated Circuit)(미도시)와, 상기 액정패널(41)의 하부에 부착되어 정보표시면을 균일하게 조사하는 백라이트로 구성된다.As shown in FIG. 3, the liquid crystal display device of the present invention differs slightly depending on whether the gap between the liquid crystal panel and the backlight is a light incidence part or a light incidence part. As shown in FIG. 3, a thin film transistor substrate 48 having a pixel array and a color filter A liquid crystal panel 41 having a filter substrate 49 attached thereto with a liquid crystal layer interposed therebetween, a driver IC (not shown) for applying a voltage to each of the pixels and supplying a signal for driving the liquid crystal; It is attached to the lower portion of the liquid crystal panel 41 is composed of a backlight for irradiating the information display surface uniformly.

이 때, 백라이트의 광원(51)과 근접한 거리에 있는 입광부에서의액정패널(41)과 시트류(46) 사이의 거리는 약 0.1mm이하 정도로 하고, 광원(51)과 상대적으로 멀리 떨어져 있는 반입광부에서의 액정패널(41)과 시트류(46) 사이의 거리는 약 0.2mm 정도로 한다.At this time, the distance between the liquid crystal panel 41 and the sheet 46 at the light incidence part close to the light source 51 of the backlight is about 0.1 mm or less, and the light incident part relatively far from the light source 51. The distance between the liquid crystal panel 41 and the sheet 46 is approximately 0.2 mm.

즉, 입광부에서는 시트류에 주름이 생기지 않도록 액정패널과 시트류 사이의 거리를 좁히고, 반입광부에서는 시트류의 리플에 의해 액정패널에 충격이 가해지지 않도록 액정패널과 시트류 사이의 거리를 크게 한다.That is, the distance between the liquid crystal panel and the sheets is narrowed at the light incident part to prevent wrinkles, and the distance between the liquid crystal panel and the sheets is increased at the light incident part so that the impact is not applied to the liquid crystal panel by the ripple of the sheets. do.

액정패널과 백라이트 사이의 갭을 조절하는 방법은 다양할 것인데, 그 중 도광판의 높낮이를 조절하여 갭을 조절하는 방법을 설명하면 다음과 같다.The method of controlling the gap between the liquid crystal panel and the backlight will be various. Among them, a method of controlling the gap by adjusting the height of the light guide plate will be described below.

도 4에서와 같이, 입광부과 반입광부에서의 액정패널(41)과 시트류(58) 사이의 거리 차이(A)만큼 입광부의 도광판(53) 높이를 올려준다.As shown in FIG. 4, the height of the light guide plate 53 of the light incident portion is increased by the distance A between the liquid crystal panel 41 and the sheets 58 in the light incident portion and the light incident portion.

즉, 본발명에 의한 백라이트는 액정패널(41) 하부의 에지 부분에 장착된 관형상의 광원(51)과, 상기 램프(51)를 고정시켜줌과 동시에 램프에서 나온 빛을 도광판(53)으로 집속시켜주는 램프하우징(52)과, 상기 광원(51)의 일측에 장착되어 광원으로부터의 광을 액정패널(41) 측으로 전달시킴과 아울러, 반입광부에 비해 입광부의 높이가 "A"만큼 높아 입광부의 패널과 시트류 사이의 거리가 좁아지도록 하는 아크릴수지 등의 박판형상의 도광판(53)과, 상기 도광판(53)의 상면에 차례로 배치되어 도광판(53)에서 나온 빛을 균일하게 확산시키고 집광시켜 액정패널측으로 전달하는 확산시트(55), 프리즘 시트(56), 보호시트(57)와, 상기 도광판(53) 하부에 배치되어 도광판 저면으로 새어나오는 빛을 액정패널(41) 측으로 반사시켜 주는 반사시트(54)와, 상기 구성 요소들을 수납하여 고정시켜주는 메인 지지대(59)를 포함하여 구성된다.That is, the backlight according to the present invention fixes the tubular light source 51 mounted on the edge portion of the lower part of the liquid crystal panel 41 and the lamp 51 and at the same time focuses the light from the lamp onto the light guide plate 53. It is mounted on one side of the lamp housing 52 and the light source 51 to transmit the light from the light source to the liquid crystal panel 41 side, and the height of the light incident portion is as high as "A" compared to the incoming light incident portion. The light guide plate 53 is formed in a thin plate shape such as an acrylic resin such that the distance between the panel and the sheets of the miner is narrowed, and is sequentially arranged on the upper surface of the light guide plate 53 to uniformly diffuse and collect light from the light guide plate 53. And a diffuser sheet 55, a prism sheet 56, a protective sheet 57, and a light disposed at a lower portion of the light guide plate 53 to reflect to the liquid crystal panel 41. The reflective sheet 54 and the components It is configured to include a main support 59 for storing and fixing.

이 때, 상기 도광판(53)은 광원(51)에서 멀리 떨어진 부분에까지 광이 전달될 수 있도록 그 저면이 입광부 쪽으로 기울어지기도 하며, 광산란을 위해 그 저면에 유백색의 산란패턴이 인쇄되기도 한다.At this time, the light guide plate 53 may be inclined toward the light incident part so that light can be transmitted to a part far from the light source 51, and a milky white scattering pattern may be printed on the bottom for light scattering.

참고로, 상기 백라이트는 고휘도가 요구되는 모니터용 또는 TV용 액정표시장치에 사용될 경우, 광원을 두 개 이상 포함하기도 하는데, 이 경우에도 도광판의 상면의 경사를 조절하여 액정패널과 광학 시트류 사이의 거리를 조절할 수 있다.For reference, when the backlight is used in a liquid crystal display device for a monitor or a TV for which high brightness is required, the backlight may include two or more light sources. In this case, the backlight may be disposed between the liquid crystal panel and the optical sheet by adjusting the inclination of the upper surface of the light guide plate. You can adjust the distance.

한편, 상기에서와 같이 도광판 상면의 높낮이를 조절하는 방법 이외에 메인 지지대의 형태를 변형하여 액정패널과 시트류 사이의 거리를 조절할 수 있다.Meanwhile, in addition to the method of adjusting the height of the upper surface of the light guide plate as described above, the shape of the main support may be modified to control the distance between the liquid crystal panel and the sheets.

즉, 도 5에서와 같이, 메인 지지대(59)의 반입광부 높이를 입광부에 비해 "B"만큼 낮추어 기존의 반사판(54), 도광판(53), 광학 시트류(58)를 차례로 장착하면 된다.That is, as shown in FIG. 5, the height of the light incident part of the main support 59 may be lowered by "B" compared to the light incident part so that the existing reflector 54, the light guide plate 53, and the optical sheets 58 may be mounted in this order. .

상기와 같은 본 발명의 액정표시장치는 다음과 같은 효과가 있다.The liquid crystal display of the present invention as described above has the following effects.

첫째, 입광부에서의 액정패널과 광학 시트류의 갭이 줄어들어 광학 시트류가 주름지는 현상이 개선된다.First, the gap between the liquid crystal panel and the optical sheets in the light incident portion is reduced, so that the phenomenon of wrinkles of the optical sheets is improved.

따라서, 광학 시트류의 주름에 의해 빛의 경로가 휘는 현상이 방지되어 화면 밝기가 균일해진다.Therefore, the warping of the light path due to the wrinkles of the optical sheets is prevented and the screen brightness is uniform.

둘째, 반입광부에서의 액정패널과 광학 시트류의 갭이 커져 리플이 액정패널에 충격을 가하는 현상이 방지된다.Second, the gap between the liquid crystal panel and the optical sheets in the incident light portion is increased to prevent the ripple from impacting the liquid crystal panel.

따라서, 휘도가 균일하고 화상품질이 우수한 액정표시장치를 얻을 수 있다.Therefore, a liquid crystal display device with uniform luminance and excellent image quality can be obtained.

Claims (6)

제 1 ,제 2 기판이 액정층을 사이에 두고 부착된 액정패널과, 상기 액정패널의 하부에 배치되어 광원과, 상기 광원 일측에 형성되어 광을 전달하는 도광판과, 상기 도광판 하부에 위치하는 반사판과, 상기 도광판 상부에 차례로 위치하는 적어도 하나 이상의 광학시트류와, 상기 요소를 수납하는 메인 지지대를 포함하는 백라이트로 구성된 액정표시장치에 있어서,A liquid crystal panel having a first and second substrates attached to each other with a liquid crystal layer interposed therebetween, a light source disposed under the liquid crystal panel, a light guide plate formed on one side of the light source to transmit light, and a reflective plate positioned below the light guide plate And a backlight including at least one or more optical sheets sequentially positioned on the light guide plate, and a main support for accommodating the elements. 상기 백라이트 입광부에서의 액정패널과 광학시트류 사이의 거리가 반입광부에 비해 좁은 것을 특징으로 하는 액정표시장치.And a distance between the liquid crystal panel and the optical sheets in the backlight incident part is smaller than that of the incoming incident part. 제 1 항에 있어서, 상기 액정패널과 광학 시트류 사이의 거리가 상기 백라이트 입광부에서는 0.1mm이하이고, 반입광부에서는 0.2mm인 것을 특징으로 하는 액정표시장치.The liquid crystal display device according to claim 1, wherein a distance between the liquid crystal panel and the optical sheets is 0.1 mm or less in the backlight incident part and 0.2 mm in the incoming incident part. 제 1 항에 있어서, 상기 광학 시트류는 확산시트, 프리즘시트를 포함하는 것을 특징으로 하는 액정표시장치.The liquid crystal display device according to claim 1, wherein the optical sheet comprises a diffusion sheet and a prism sheet. 제 1 항에 있어서, 상기 도광판은 입광부에서의 상면의 높이가 반입광부에 비해 높은 것을 특징으로 하는 액정표시장치.The liquid crystal display of claim 1, wherein the height of the upper surface of the light guide plate is higher than that of the light incident part. 제 1 항에 있어서, 메인 지지대는 입광부에서의 상면의 높이가 반입광부에 비해 높은 것을 특징으로 하는 액정표시장치.The liquid crystal display of claim 1, wherein the height of the upper surface of the main support part is higher than that of the incident light part. 제 1 항에 있어서, 상기 광원은 관형상인 것을 특징으로 하는 액정표시장치.The liquid crystal display device according to claim 1, wherein the light source is tubular.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100983500B1 (en) * 2003-09-06 2010-09-24 삼성전자주식회사 Flat panel display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100983500B1 (en) * 2003-09-06 2010-09-24 삼성전자주식회사 Flat panel display device

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