KR100441843B1 - Backlight assembly of a liquid crystal display device, specially in relation to effectively emitting heat generated from a lamp by changing a shape of a mold frame - Google Patents

Backlight assembly of a liquid crystal display device, specially in relation to effectively emitting heat generated from a lamp by changing a shape of a mold frame Download PDF

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KR100441843B1
KR100441843B1 KR1019970038415A KR19970038415A KR100441843B1 KR 100441843 B1 KR100441843 B1 KR 100441843B1 KR 1019970038415 A KR1019970038415 A KR 1019970038415A KR 19970038415 A KR19970038415 A KR 19970038415A KR 100441843 B1 KR100441843 B1 KR 100441843B1
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South Korea
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mold frame
lamp
guide plate
light guide
backlight assembly
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KR1019970038415A
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Korean (ko)
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KR19990016000A (en
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이상환
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삼성전자주식회사
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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
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0085—Means for removing heat created by the light source from the package
    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/009—Positioning aspects of the light source in the package
    • 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

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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)
  • Planar Illumination Modules (AREA)

Abstract

PURPOSE: A backlight assembly of an LCD device is provided to contact a lower side of the second sidewall with a back cover, and to form a predetermined space portion between a lower side of the first sidewall and the back cover, thereby emitting a portion of heat transmitted to a mold frame. CONSTITUTION: A lamp assembly(20) is used as a light source of an LCD module. A reflecting plate(50) reflects light under a light guide plate(40). A mold frame(10) covers edges of the light guide plate(40) and the lamp assembly(20). A back cover(30) is fixed to a lower side to be opposed to the mold frame(10) and the light guide plate(40). A sheet diffuses and condenses light on an upper side of the light guide plate(40). An LCD panel(70) is installed on an upper side of the sheet to display information. A top chassis(80) is overlapped with edges of an upper side of the LCD panel(70), and wherein one side thereof is fixed to the mold frame(10) to support the LCD panel(70).

Description

액정표시장치의 백라이트 어셈블리Backlight Assembly of Liquid Crystal Display

본 발명은 액정표시장치의 백라이트 어셈블리에 관한 것으로, 보다 상세하게는 몰드프레임의 형상을 변경하여 램프로부터 발생되는 열이 효율적으로 방출될 수 있도록 한 액정표시장치의 백라이트 어셈블리에 관한 것이다.The present invention relates to a backlight assembly of a liquid crystal display device, and more particularly, to a backlight assembly of a liquid crystal display device to change the shape of the mold frame so that heat generated from the lamp can be efficiently discharged.

액정표시장치의 백라이트 어셈블리에서 램프 어셈블리의 역할과 기능은 갈수록 중요한 과제로 대두되고 있다. 이는 램프 어셈블리의 구조에 따라서 TFT LCD 모듈(module)의 크기와 중량 및 광량 등이 달라져 TFT-LCD 모듈의 기계적, 광학적 특성에 많은 영향을 미치기 때문이다.The role and function of the lamp assembly in the backlight assembly of the liquid crystal display device is becoming an important issue. This is because the size, weight, light quantity, etc. of the TFT LCD module are changed according to the structure of the lamp assembly, which greatly affects the mechanical and optical characteristics of the TFT-LCD module.

특히 램프로부터 발생되는 열은 분산시켜 LCD패널에 전달되지 않도록 하는 것이 중요하다. 이는 온도변화에 따라 화면작동을 위한 구동전압이 변화하므로서 LCD패널이 영향을 받기 때문이다. 또한 램프에 근접한 부분과 램프로부터 멀리 떨어진 부분과의 사이에 온도변화에 의해 화질이 불균일해지기 때문이다.In particular, it is important to dissipate heat generated from the lamp so that it is not transmitted to the LCD panel. This is because the LCD panel is affected as the driving voltage for the screen operation changes according to the temperature change. This is because the image quality is uneven due to the temperature change between the part near the lamp and the part far from the lamp.

도 1은 종래의 LCD 모듈을 개략적으로 나타낸 단면도이다.1 is a cross-sectional view schematically showing a conventional LCD module.

도광판(40)의 일측에는 LCD 모듈의 광원으로 사용되는 램프 어셈블리(20)가 설치되고, 도광판(40)의 하부에는 광을 반사시키는 반사판(50)이 설치된다. 몰드프레임(10)은 'ㄱ'자 단면형상으로 도광판(40)의 가장자리와 램프 어셈블리(20)를 감싸도록 설치된다. 또한 몰드프레임(10)과 도광판(40) 전체에 대향하도록 하부면에 백커버(back cover; 30)가 고정된다. 도광판(40)의 상부면에는 광을 확산하고 집광하는 시트류(60)가 설치되고, 시트류(60)의 상부면에는 정보를 디스플레이하는 LCD 패널(70)이 설치된다. 또한 탑샤시(top chassis; 80)는 LCD 패널(70)의 상부면의 가장자리와 겹쳐지고 일측면이 몰드프레임(10)에 고정되어 LCD 패널(70)을 지지한다. 미설명부호 90은 인쇄회로기판(PCB)이다.A lamp assembly 20 used as a light source of the LCD module is installed at one side of the light guide plate 40, and a reflecting plate 50 for reflecting light is provided at the bottom of the light guide plate 40. The mold frame 10 is installed to surround the edge of the light guide plate 40 and the lamp assembly 20 in a '-' cross-sectional shape. In addition, a back cover 30 is fixed to the lower surface of the mold frame 10 and the light guide plate 40 so as to face the whole. The upper surface of the light guide plate 40 is provided with sheets 60 for diffusing and condensing light, and the upper panel of the sheet 60 is provided with an LCD panel 70 for displaying information. In addition, the top chassis 80 overlaps the edge of the upper surface of the LCD panel 70 and one side is fixed to the mold frame 10 to support the LCD panel 70. Reference numeral 90 is a printed circuit board (PCB).

램프 어셈블리(20)는 램프(22)와 램프(22)를 에워싸서 도광판(40)의 반대방향으로 방출되는 빛을 반사시키는 램프 커버(24)로 이루어진다.The lamp assembly 20 consists of a lamp cover 24 which surrounds the lamp 22 and the lamp 22 to reflect light emitted in the opposite direction of the light guide plate 40.

또한 몰드프레임(10)의 측벽은 소정간격으로 이격되어 저면이 백커버(30)와 접촉하는 제 1 측벽(10a)과 제 2 측벽(10b)으로 이루어지며, 제 1 및 제 2 측벽(10a, 10b) 사이에는 통로(15)가 형성된다.In addition, the sidewalls of the mold frame 10 may be spaced apart at predetermined intervals, and may include a first sidewall 10a and a second sidewall 10b in contact with the back cover 30. The first and second sidewalls 10a, A passage 15 is formed between 10b).

이와 같이 구성된 종래의 LCD모듈에 있어서 램프(22)로부터 방출되는 열은 백커버(30)를 통하여 외부로 전달되거나, 몰드프레임(10)에서 패널(70)을 통해 외부로 방출되거나, 몰드프레임(10)에서 탑샤시(80)를 거쳐 외부로 방출된다.In the conventional LCD module configured as described above, the heat emitted from the lamp 22 is transferred to the outside through the back cover 30, the mold frame 10 is discharged to the outside through the panel 70, or the mold frame ( 10) is discharged to the outside through the top chassis 80.

그러나 백커버(30)의 재질은 알루미늄이고, 몰드프레임(10)은 수지로 제작되기 때문에 열전달율이 다를 수밖에 없다. 즉, 알루미늄재질의 백커버(30)를 통해서는 열이 잘 방출되지만, 수지재질의 몰드프레임(10)을 통해서는 방출이 잘되지 않는다. 이에 따라 LCD모듈 내부의 온도가 상승하여 구동전압이 영향을 받음으로서 화질이 저하하는 문제점이 발생하였다.However, since the material of the back cover 30 is aluminum, and the mold frame 10 is made of resin, the heat transfer rate is inevitably different. That is, heat is well released through the back cover 30 made of aluminum, but is not well released through the mold frame 10 made of resin. As a result, the temperature inside the LCD module increases and the driving voltage is affected.

또한 몰드프레임측 내부의 온도가 상승하여 패널에 전달되면, 패널(70)상에 있어 램프(22)에 가까운 부분의 온도가 국부적으로 상승하므로서 패널(70) 전체에 걸쳐 화질이 균일하지 못하다는 문제점이 발생하였다.In addition, when the temperature inside the mold frame rises and is transmitted to the panel, the temperature of a portion near the lamp 22 on the panel 70 locally rises, and thus the image quality is not uniform throughout the panel 70. This occurred.

따라서 본 발명의 목적은 LCD모듈 내부의 온도상승을 방지하기 위해 램프로부터 발생되는 열을 단시간에 외부로 방출할 수 있는 액정표시장치의 백라이트 어셈블리를 제공하는데 있다.Accordingly, an object of the present invention is to provide a backlight assembly of a liquid crystal display device capable of dissipating heat generated from a lamp to the outside in a short time to prevent the temperature rise inside the LCD module.

도 1은 종래의 LCD 모듈을 개략적으로 나타낸 단면도이고,1 is a cross-sectional view schematically showing a conventional LCD module,

도 2는 본 발명에 따른 LCD 모듈을 개략적으로 나타낸 단면도이고,2 is a cross-sectional view schematically showing an LCD module according to the present invention,

도 3은 도 2의 3-3'를 절단한 단면도이다.3 is a cross-sectional view taken along line 3-3 'of FIG.

이하 첨부된 도면을 참조하여 본 발명의 실시예를 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2를 참조하면, 도광판(40)의 일측에는 LCD 모듈의 광원으로 사용되는 램프 어셈블리(20)가 설치되고, 도광판(40)의 하부에는 광을 반사시키는 반사판(50)이 설치된다. 몰드프레임(10)은 'ㄱ'자 단면형상으로 도광판(40)의 가장자리와 램프 어셈블리(20)를 감싸도록 설치된다. 또한 몰드프레임(10)과 도광판(40) 전체에 대향하도록 하부면에 백커버(30)가 고정된다. 도광판(40)의 상부면에는 광을 확산하고 집광하는 시트류(60)가 설치되고, 시트류(60)의 상부면에는 정보를 디스플레이하는 LCD 패널(70)이 설치된다. 또한 탑샤시(80)는 LCD 패널(70)의 상부면의 가장자리와 겹쳐지고 일측면이 몰드프레임(10)에 고정되어 LCD 패널(70)을 지지한다.Referring to FIG. 2, a lamp assembly 20 used as a light source of an LCD module is installed at one side of the light guide plate 40, and a reflecting plate 50 reflecting light is installed at a lower part of the light guide plate 40. The mold frame 10 is installed to surround the edge of the light guide plate 40 and the lamp assembly 20 in a '-' cross-sectional shape. In addition, the back cover 30 is fixed to the lower surface to face the mold frame 10 and the entire light guide plate 40. The upper surface of the light guide plate 40 is provided with sheets 60 for diffusing and condensing light, and the upper panel of the sheet 60 is provided with an LCD panel 70 for displaying information. In addition, the top chassis 80 overlaps the edge of the upper surface of the LCD panel 70 and one side is fixed to the mold frame 10 to support the LCD panel 70.

본 발명에 따르면, 몰드프레임(10)의 측벽은 램프 어셈블리(20)로부터 각각 차례로 이격된 제 1 측벽(10a)과 제 2 측벽(10b)으로 구성되며, 제 2 측벽(10b)의 저면과 백커버(30)는 접촉하고 제 1 측벽(10a)의 저면과 백커버(30) 사이에는 소정의 공간부(100)가 형성된다.According to the present invention, the side wall of the mold frame 10 is composed of a first side wall (10a) and a second side wall (10b) spaced apart from the lamp assembly 20, respectively, and the bottom and back of the second side wall (10b) The cover 30 contacts and a predetermined space portion 100 is formed between the bottom surface of the first side wall 10a and the back cover 30.

공간부(100)의 크기는 램프(22)로부터의 열이 통로(15)로 원활하게 전달될 수 있는 정도의 크기이면 족하다. 또한 도 3에 도시된 바와 같이, 공간부(100)는 몰드프레임(10) 측벽의 길이방향으로 연속적으로 형성하거나 몰드프레임 측벽(10)의 길이방향으로 단속적으로 형성할 수 있다.The size of the space 100 is sufficient if the heat from the lamp 22 can be transferred to the passage 15 smoothly. In addition, as shown in FIG. 3, the space part 100 may be continuously formed in the longitudinal direction of the sidewall of the mold frame 10 or intermittently in the longitudinal direction of the mold frame sidewall 10.

이와 같이 형성된 본 발명에 따르면, 램프(22)로부터 발생한 열은 공간부(100)를 통해 통로(15)와 연결되어 순환되는 공기가 직접 램프 어셈블리(20)에 접촉하므로서 몰드프레임(10)에 전달되는 열의 일부를 외부로 전달시킬 수 있어 몰드프레임(10)을 통한 LCD패널로의 열의 전달을 일부 제거할 수 있는 이점이 있다. 또한 공간부(100)를 형성하므로서 램프(22)로부터의 열이 전달성이 좋은 알루미늄 재질의 백커버(30)와 접촉하는 면적이 증가하므로 외부로의 열방출량이 많아지게 되어 단시간에 내부의 열을 외부로 방출할 수 있는 이점이 있다.According to the present invention formed as described above, the heat generated from the lamp 22 is connected to the passage 15 through the space portion 100 and the air circulated is transferred to the mold frame 10 by directly contacting the lamp assembly 20. Part of the heat to be transferred to the outside has the advantage of removing some of the heat transfer to the LCD panel through the mold frame 10. In addition, since the space portion 100 is formed, the area in which the heat from the lamp 22 comes into contact with the back cover 30 made of aluminum, which has good transferability, increases, thereby increasing the amount of heat released to the outside. There is an advantage that can be emitted to the outside.

이와 같이, 본 발명에 따르면, 몰드프레임의 측벽을 램프 어셈블리로부터 각각 차례로 이격된 제 1 측벽과 제 2 측벽으로 구성하되, 제 2 측벽의 저면과 백커버는 접촉하도록 하고 제 1 측벽의 저면과 백커버 사이에는 소정의 공간부를 형성하므로서, 몰드프레임으로 전달되는 열의 일부를 외부로 방출할 수 있어 램프에 가까운 부분의 온도가 국부적으로 상승하므로서 패널 전체에 걸쳐 화질이 균일하지 못하다는 문제점을 제거할 수 있고, 단시간에 열을 방출하므로서 내부 온도의 상승으로 인한 구동전압의 영향으로 화질이 저하하는 문제점을 제거할 수 있다.As such, according to the present invention, the side wall of the mold frame is composed of a first side wall and a second side wall spaced apart from the lamp assembly, respectively, wherein the bottom and back cover of the second side wall are in contact with each other, and the bottom and back of the first side wall are contacted. By forming a predetermined space between the covers, part of the heat transferred to the mold frame can be discharged to the outside, thereby eliminating the problem that the image quality is not uniform throughout the panel due to a local rise in temperature near the lamp. In addition, since the heat is released in a short time, the problem of deterioration in image quality due to the influence of the driving voltage due to the increase in the internal temperature can be eliminated.

Claims (3)

몰드프레임 일측면에 설치된 램프 어셈블리와, 상기 몰드프레임의 하부면에 고정된 백커버와, 상기 램프 어셈블리의 전면에 설치되어 광의 전달경로를 제공하는 도광판과, 상기 도광판의 하부에 설치되어 광을 반사시키는 반사판과, 상기 도광판의 상부면에 설치되어 광을 확산하고 집광하는 시트류로 이루어진 액정표시장치의 백라이트 어셈블리에 있어서,A lamp assembly installed on one side of the mold frame, a back cover fixed to the bottom surface of the mold frame, a light guide plate installed on the front surface of the lamp assembly to provide a light transmission path, and a light installed on the bottom of the light guide plate to reflect light In the backlight assembly of the liquid crystal display device comprising a reflector plate and a sheet provided on the upper surface of the light guide plate to diffuse and collect light, 상기 몰드프레임의 측벽은 상기 램프 어셈블리로부터 각각 차례로 이격된 제 1 측벽과 제 2 측벽으로 구성되며, 상기 제 2 측벽의 저면과 상기 백커버는 접촉하고 상기 제 1 측벽의 저면과 상기 백커버 사이에는 소정의 공간부가 형성되는 것을 특징으로 하는 액정표시장치의 백라이트 어셈블리.The side wall of the mold frame may include a first side wall and a second side wall spaced apart from the lamp assembly, respectively, and the bottom surface of the second side wall and the back cover may contact each other, and may be disposed between the bottom surface of the first side wall and the back cover. The backlight assembly of the liquid crystal display device, characterized in that a predetermined space is formed. 제 1 항에 있어서, 상기 공간부는 상기 몰드프레임 측벽의 길이방향으로 연속적인 것을 특징으로 하는 액정표시장치의 백라이트 어셈블리.The backlight assembly of claim 1, wherein the space part is continuous in a longitudinal direction of the mold frame sidewall. 제 1 항에 있어서, 상기 공간부는 상기 몰드프레임 측벽의 길이방향으로 단속적인 것을 특징으로 하는 액정표시장치의 백라이트 어셈블리.The backlight assembly of claim 1, wherein the space part is intermittent in the longitudinal direction of the mold frame sidewall.
KR1019970038415A 1997-08-12 1997-08-12 Backlight assembly of a liquid crystal display device, specially in relation to effectively emitting heat generated from a lamp by changing a shape of a mold frame KR100441843B1 (en)

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