US20100188607A1 - Backlight assembly and display device including the same - Google Patents

Backlight assembly and display device including the same Download PDF

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Publication number
US20100188607A1
US20100188607A1 US12/696,948 US69694810A US2010188607A1 US 20100188607 A1 US20100188607 A1 US 20100188607A1 US 69694810 A US69694810 A US 69694810A US 2010188607 A1 US2010188607 A1 US 2010188607A1
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US
United States
Prior art keywords
light source
disposed
receiving unit
light
region
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/696,948
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English (en)
Inventor
Hyun-Su Park
Jae-Sang Lee
Sang-hyeok Lee
Ki-Hwan BAEK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Display Co Ltd
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Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Assigned to SAMSUNG ELECTRONICS CO., LTD. reassignment SAMSUNG ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAEK, KI-HWAN, LEE, JAE-SANG, LEE, SANG-HYEOK, PARK, HYUN-SU
Publication of US20100188607A1 publication Critical patent/US20100188607A1/en
Assigned to SAMSUNG DISPLAY CO., LTD. reassignment SAMSUNG DISPLAY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAMSUNG ELECTRONICS CO., LTD.
Priority to US13/910,596 priority Critical patent/US9194571B2/en
Priority to US15/821,856 priority patent/USRE49458E1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • 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
    • 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
    • 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
    • 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
    • G02F1/133603—Direct backlight with LEDs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20954—Modifications to facilitate cooling, ventilating, or heating for display panels
    • H05K7/20963—Heat transfer by conduction from internal heat source to heat radiating structure
    • 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
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • G02B6/0083—Details of electrical connections of light sources to drivers, circuit boards, or the like
    • 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
    • G02B6/0091—Positioning aspects of the light source relative to 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133317—Intermediate frames, e.g. between backlight housing and front frame
    • 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
    • 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
    • G02F1/133628—Illuminating devices with cooling means

Definitions

  • the present invention relates to a backlight assembly and a display device including the backlight assembly. More particularly, the present invention relates to a backlight assembly that effectively discharges heat generated from a light source therein, and a display device having the backlight assembly.
  • liquid crystal display devices are often used due to a variety of features, such as light weight, slim shape, low power consumption, full-color implementation and high resolution, for example.
  • liquid crystal display devices are utilized in computers, laptop computers, portable digital assistants (“PDAs”), telephones, television (“TV”) sets, audio/video devices and other similar devices.
  • PDAs portable digital assistants
  • TV television
  • audio/video devices and other similar devices.
  • light transmission is controlled, based on image signals applied to control switches disposed in a matrix pattern, to display images on liquid crystal display panels of the devices.
  • a liquid crystal display device is not a self light-emitting device, and thus, requires a light source such as a backlight, for example.
  • the backlight for the liquid crystal display device may be an edge type backlight or a direct type backlight, based on a position of the light source in the backlight.
  • the light source is disposed at an end portion of the liquid crystal display panel, such that light emitted from the light source is radiated to the liquid crystal display panel through a transparent waveguide plate disposed below the liquid crystal display panel.
  • the edge type backlight provides good light uniformity, has a substantially extended life span and can easily be included in a thin display device.
  • the edge type backlight is employed in a medium-size or small-size liquid crystal display panel.
  • the direct type backlight light sources are typically disposed below the liquid crystal display panel such that light emitted from the light source is radiated over an entire surface of the liquid crystal display panel.
  • the direct type backlight provides high luminance and can generally be employed in a large-size or medium-size liquid crystal display panel.
  • a cold cathode fluorescent lamp may be used as a light source.
  • a light emitting diode since the light emitting diode has various properties such as long life span, lower power consumption, light weight and thin shape, for example.
  • the light emitting diode generates a substantial amount of heat. Therefore, a reliability of electric circuits is degraded, due to an increase in the internal temperature of a backlight assembly caused by heat generated from the light emitting diode.
  • deformation of parts or cases is caused due to thermal stresses caused by an internal temperature gradient.
  • An aspect of the present invention relates to a display device including a light source which emits light, a light guide plate disposed adjacent to the light source and which receives the light emitted from the light source, a light source supporter including a bottom plane including a first region and a second region, and a first receiving unit including a bottom surface and a side wall.
  • the light source and the light guide plate are disposed on the first region of the bottom plane
  • the second region extends from a portion of the first region on which the light source is disposed
  • the bottom surface is disposed opposite the light guide plate
  • the side wall is disposed at an end portion of the bottom surface along a direction perpendicular to a plane defined by the bottom surface.
  • the light source may include a printed circuit board and a light emitting diode.
  • an inner space may be formed on the second region and between the light source and the side wall of the first receiving unit.
  • the light source supporter may further include a bent portion disposed on an end portion of the second region of the light source supporter.
  • the backlight assembly may further include a middle frame and at least a portion of the middle frame may be disposed in the inner space.
  • the middle frame may include a U-shaped portion, and at least a portion of the U-shaped portion of the middle frame may be disposed in the inner space.
  • the middle frame may further include a bent portion connected to the U-shaped portion and disposed on an optical sheet disposed on the light source and the light guide plate.
  • the light source supporter may include a metal plate.
  • the light source supporter may include aluminum.
  • the second region of the light source supporter may extend from the light source and provide a heat dissipation path for the backlight assembly.
  • the light source supporter may contact the first receiving unit and dissipate heat.
  • the bent portion of the second region may be disposed along the side wall of the first receiving unit and contact the side wall.
  • a hole may be formed in the bottom surface of the first receiving unit, and the light source supporter may further include a protrusion disposed in the hole.
  • a liquid crystal display in another exemplary embodiment, includes a liquid crystal panel, a backlight assembly and a second receiving unit.
  • the liquid displays an image.
  • the backlight assembly includes a light source disposed adjacent to an edge portion of the liquid crystal panel, a light guide plate disposed adjacent to the light source and which emits light to the liquid crystal panel, an optical sheet disposed between the light guide plate and the liquid crystal panel, a first receiving unit including a bottom surface and a side wall and which accommodates the light source, the light guide plate and the optical sheet and a light source supporter which supports the light source and the light guide plate, the light source and the light guide disposed on a first region of the light source supporter.
  • the second receiving unit covers at least a portion of the edge portion of the liquid crystal panel and the side wall of the first receiving unit.
  • the light source supporter may include a second region extending from the first region of the light source supporter.
  • a gap may be formed on the second region of the light source supporter and between an end portion of the second region and the light source.
  • the liquid crystal display may further include a third receiving unit covering at least a portion of the optical sheet and the liquid crystal panel, and at least a portion of the third receiving unit may be disposed in the gap.
  • the third receiving unit may include a U-shaped portion disposed in the gap.
  • the light source supporter may include metallic material.
  • the light source supporter may include aluminum.
  • FIG. 1 is an exploded perspective view of an exemplary embodiment of a display device according to the present invention
  • FIG. 2 is a partial cross-sectional view taken along line A-A′ of FIG. 1 ;
  • FIGS. 3 to 5 are partial cross-sectional views showing additional exemplary embodiments of a metal plate of the display device shown in FIG. 2 ;
  • FIG. 6 is an exploded perspective view of another exemplary embodiment of a display device according to the present invention.
  • FIG. 7 is a partial cross-sectional view taken along line B-B′ of FIG. 6 ;
  • FIG. 8 is a partial cross-sectional view showing another exemplary embodiment of a metal plate of the display device shown in FIG. 7 ;
  • first, second, third etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
  • relative terms such as “lower” or “bottom” and “upper” or “top,” may be used herein to describe one element's relationship to another element as illustrated in the Figures. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. For example, if the device in one of the figures is turned over, elements described as being on the “lower” side of other elements would then be oriented on “upper” sides of the other elements. The exemplary term “lower,” can therefore, encompasses both an orientation of “lower” and “upper,” depending on the particular orientation of the figure.
  • FIG. 1 is an exploded perspective view of an exemplary embodiment of a display device according to the present invention.
  • FIG. 2 is a partial cross-sectional view taken along line A-A′ of FIG. 1 .
  • a liquid crystal display (“LCD”) device includes a display assembly 1000 disposed in an upper portion of the LCD device and a backlight assembly 2000 disposed in a lower portion of the LCD device.
  • LCD liquid crystal display
  • the display assembly 1000 includes a liquid crystal (“LC”) panel 200 , a driver circuit 300 including a first driver circuit 300 a and a second driver circuit 300 b , and a second receiving unit 100 .
  • LC liquid crystal
  • the LC panel 200 includes a color filter substrate 210 and a thin film transistor (“TFT”) substrate 220 .
  • the color filter substrate 210 includes red, green and blue (“RGB”) pixels, which are disposed using a thin film process and generate a predetermined color when light passes through the RGB pixels.
  • RGB red, green and blue
  • a common electrode including a transparent conductive material such as indium thin oxide (“ITO”) or indium zinc oxide (“IZO”), for example, is disposed on an outer surface of the color filter substrate 210 .
  • the TFT substrate 220 is a transparent glass substrate on which thin film transistors are disposed in a matrix pattern.
  • a source terminal of each of the TFTs is connected to a data line, and a gate terminal of the each of the TFTs is connected to a gate line.
  • a drain terminal of each of the TFTs is connected to a pixel electrode, which is a transparent electrode including a transparent conductive material.
  • liquid crystal molecules in the LC panel disposed between the TFT substrate 220 and the color filter substrate 210 changes their orientation and light transmissivity is changed according to the change of the orientation, thereby displaying a desired image.
  • the driver circuit 300 connected to the LC panel 200 includes a data-side printed circuit board (“PCB”) 310 a , which may include a control integrated circuit (“IC”) and apply a predetermined data signal to the data line of the TFT substrate 220 , a gate-side printed circuit board 310 b which may include a control integrated circuit and apply a gate signal to the gate line of the TFT substrate 220 , a data-side flexible printed circuit board (“FPCB”) 330 a which has an exposed ground pattern and connects the TFT substrate 220 to the data-side printed circuit board 310 a , and a gate-side flexible printed circuit board 330 b which has an exposed ground pattern and connects the TFT substrate 220 to the gate-side printed circuit board 310 b.
  • PCB data-side printed circuit board
  • FPCB data-side flexible printed circuit board
  • the data-side and gate-side printed circuit boards 310 a and 310 b are connected to the data-side and gate-side flexible printed circuit boards 330 a and 330 b , respectively, and thereby transmit an external image signal and a gate drive signal.
  • the data-side and gate-side printed circuit boards 310 a and 310 b may be disposed on a same printed circuit board.
  • the data-side and gate-side printed circuit boards 310 a and 310 b may be alternately connected to a side of the LC panel 200 and the gate line and data line of the TFT substrate 220 may extend to one side thereof.
  • the data-side and gate-side flexible printed circuit boards 330 a and 330 b are connected to the data line and to the gate line of the TFT substrate 220 , respectively, and thereby transmit a data drive signal and a gate drive signal to the TFT.
  • the flexible printed circuit board 230 include a tape automated bonding (“TAB”) integrated circuit, which alternately transmits read, green, blue signals, a shift start clock (“SSC”) signal, a latch pulse (“LP”) signal, a gamma analog ground signal, a digital ground signal, digital electric power, an analog electric power common voltage, a stored voltage and other similar signals, for example, which are generated from the data-side and gate-side printed circuit boards 310 a and 310 b , to the LC panel 200 .
  • the TFT substrate 220 may include an integrated circuit.
  • the second receiving unit 100 is in a rectangular frame shape having a plane section and a sidewall section disposed perpendicular to the plane section.
  • the second receiving unit effectively prevents components of the display assembly 1000 from departing from the display assemble 1000 and protects LC panel 200 and backlight assembly 2000 against external impact.
  • the second receiving unit 100 may cover at least a portion of the LC panel 200 and the backlight assembly 2000 .
  • the backlight assembly 2000 includes a light source 600 , a light guide plate 700 disposed adjacent to the light source 600 , a reflective sheet 710 disposed below the light guide plate 700 , optical sheets 500 disposed above the light guide plate 700 and a first receiving unit 900 accommodating the reflective sheet 710 , the light guide plate 700 and the optical sheets 500 .
  • the backlight assembly 2000 may further include a third receiving unit 400 accommodating the reflective sheet 710 , light guide plate 700 and optical sheets 500 along with the first receiving unit 900 .
  • the third receiving unit 400 may be referred to as a middle frame 400 , which is disposed between the first and second receiving units 900 and 100 .
  • the third receiving unit 400 may include plastic material.
  • a metal plate 800 attached to the light source 600 to dissipate heat is further included in the backlight assembly.
  • the metal plate 800 is referred to as a light source supporter 800
  • the light source supporter 800 is disposed adjacent to, e.g., is attached to, the light source 600 .
  • the metal plate may be referred to as the light source supporter when the light source supporter accommodates and supports the light source.
  • the light source 600 includes a printed circuit board 620 and a light emitting diode 610 disposed thereon.
  • the light emitting diode 610 emits white light or one color of the red, green and blue.
  • the backlight assembly may include more than one light emitting diode 610 .
  • the printed circuit board 620 may discharge heat generated from the light emitting diode 610 to an outside and supply a predetermined voltage to the light emitting diode 610 disposed on the printed circuit board 620 .
  • the printed circuit board may include a metallic layer such as metal core printed circuit board (“MCPCB”), for example.
  • a groove may be formed in a predetermined portion of the printed circuit board 620 , and the light emitting diode may be disposed on the groove such that the printed circuit board 620 surrounds the light emitting diode 610 and thereby provides a reflective surface to the light emitting diode 610 and maximizes light efficiency.
  • the printed circuit board 620 may include at least one light emitting diode 610 .
  • light source 600 is disposed in a side of the backlight.
  • the light source 600 may be disposed in more than one side of the backlight assembly according to types of the display devices such as cellular phone, monitor, a laptop computer and television set, for example.
  • the light guide plate 700 is disposed in the first receiving unit 900 and disposed opposite, e.g., facing, the light sources 600 to convert light distribution of a line light source generated from light sources 600 into a light distribution of a surface light source.
  • the light guide plate 700 may include a wedge-type plate or parallel flat plate, for example.
  • the light guide plate 700 may include polymethyl methacrylate (“PMMA”), which has good transmissivity and high strength, and thereby effectively prevents deformation or damage.
  • PMMA polymethyl methacrylate
  • the light guide plate 700 may be disposed apart from the light source at a predetermined distance or disposed adjacent to the light source 600 .
  • the reflective sheet 710 includes a plate with high light reflectivity such that light incident thereon through a rear surface of the light guide plate 700 is reflected again to the light guide plate 700 , thereby reducing light loss.
  • the reflective sheet 710 may be disposed below the first receiving unit 900 .
  • the reflective plate may be in various shapes, for example, a corrugated form having a triangular projection protruding from a reference reflective surface.
  • the reflective sheet 710 may be omitted or integrated into the first receiving unit 900 .
  • the optical sheets 500 include a diffusion sheet 510 , a polarization sheet 520 and a luminance-improving sheet 530 , which are disposed above the light guide plate 700 to cause a luminance distribution of the light emitted from the light guide plate 700 to be uniform.
  • the diffusion sheet 510 may direct the light incident from the lower light guide plate towards a surface of the LC panel 200 to be diffused and uniformly distributed in a wide range such that a diffused light is radiated on the LC panel 200 .
  • the diffusion sheet 510 includes a transparent resin film including a light diffusion member disposed on at least one side of the diffusion sheet 510 .
  • the polarization sheet 520 converts light incident thereon at an inclined angle into light emitted vertically from the polarization sheet 520 and incident perpendicular to the LC panel 200 , and the light efficiency is thereby substantially maximized. Therefore, at least one polarization sheet 520 may be disposed below the LC panel 200 such that the light is emitted from the polarization sheet 520 to be perpendicular to the LC panel 200 .
  • two polarization sheets may be used, which include a first polarization sheet which polarizes the light from the diffusion sheet in a first direction and a second polarization sheet which polarizes the light in a second direction perpendicular to a plane defined by the first polarization sheet.
  • the luminance-improving sheet 530 transmits light parallel to a transmission axis of the luminance-improving sheet and reflects light perpendicular to the transmission axis.
  • the transmission axis of the luminance-improving sheet 530 may be in a same direction as the polarization axis of the polarization sheet 520 , and transmission efficiency is thereby substantially increased.
  • the first receiving unit 900 may be in a box-like shape including open top and predetermined depth to have a receiving space.
  • the first receiving unit 900 includes bottom surface 910 and side walls 920 extended vertically from the bottom surface 910 .
  • a metal plate 800 is disposed in the first receiving unit 900 .
  • the metal plate 800 is disposed in a gap between the bottom surface 910 of the first receiving unit 900 and the light source 600 .
  • the metal plate 800 includes a bottom plane 810 and a lateral plane 820 extended vertically from the bottom plane 810 .
  • the metal plate 800 is also referred to as “light source supporter” which supports the light source.
  • the lateral plane 820 contacts the third receiving unit 400 , i.e. middle mold structure, and the bottom plane 810 contacts the first receiving unit 900 .
  • heat generated from the light source 600 migrates to the metal plate 800 and thereby spread to the first and third receiving unit 900 and 400 .
  • the heat spread to the first and third receiving unit is further dissipated to the outside of the LCD and thereby substantially lower the temperature of the LCD.
  • the metal plate 800 may include any material with sufficient thermal conductivity such as aluminum, stainless steel and iron, for example, to transfer heat from the metal plate 800 to outside of the LCD.
  • the metal plate 800 may be formed using various methods such as assembling or welding the bottom plane 810 and the lateral plane 820 , for example.
  • the whole shape of the metal plate 800 may be formed using molded metal material inserted and taken out from a predesigned frame.
  • FIG. 3 is a partial cross-sectional view of another exemplary embodiment of the metal plate 800 of the display device of FIG. 2 .
  • the first receiving unit 900 has at least one hole 930 on the bottom surface 910 accommodating at least one protrusion 830 extended from the metal plate 800 .
  • the protrusion 830 is exposed to the outside of LCD by passing through the hole 930 of the first receiving unit 900 .
  • convection heat transfer made by the contact structure of the first receiving unit 900 and the metal plate 800 , is accommodated since the heat may be directly transferred to an outside atmosphere.
  • heat generated from the light source 600 is transferred metal plate 800 contacting the light source 600 , and the heat transferred from the light source 600 is further transferred to lateral plane 820 contacting third receiving unit 400 and bottom plane 810 contacting the bottom surface 910 of the first receiving unit 900 .
  • the heat transferred to the third receiving unit 400 may be transferred to the first receiving unit 900 through inter-contact structure.
  • heat, emitted along with light from the LED 610 of the light source 600 is transferred to the printed circuit board (“PCB”) 620 where the LED 610 is disposed, and the heat is dissipated to the outside through inter-contact structures of the metal plate 800 , the first receiving unit 900 , and the third receiving unit 400 .
  • PCB printed circuit board
  • the third receiving unit 400 covers at least a portion of the optical sheets 500 along with the first receiving unit 900 .
  • the third receiving unit may include plastic material according to contact structure of the optical sheets and light backlight assembly. As described above, the third receiving unit is also referred to as “a middle mold frame.”
  • the third receiving unit 400 may be omitted corresponding to application of the LCD. For example, an exemplary embodiment of the LCD in a small sized application may not include the third receiving unit 400 for a simple structure.
  • FIGS. 4 and 5 are partial cross-sectional views showing additional exemplary embodiments of the metal plate 800 .
  • the metal plate 800 may include a bent portion 840 connected to an elongated end of the bottom plane 810 and extending substantially perpendicular to the bottom plane 810 from an edge portion of the bottom plane 810 of the metal plate 800 along the side wall 920 of the first receiving unit 900 .
  • the metal plate including the bent portion 840 effectively discharges the heat from the light source.
  • the metal plate 800 supports the light guide plate 700 with the bottom plane 810 similarly to the metal plates shown in FIGS. 1 to 3 .
  • the metal plate 800 further supports the light source, e.g., light emitting diode 610 , which is disposed above the metal plate 800 .
  • a portion of the bottom plane 810 where the light source 600 and the light guide plate 700 are disposed on is referred to as “a first region.”
  • the bottom plane 810 further extends to the side wall 920 of the first receiving unit 900 .
  • a portion of the bottom plane 810 where the third receiving unit 400 is disposed is referred to as “a second region” of the bottom surface 910 .
  • the metal plate 800 may not include the bent portion 840 .
  • a gap G 1 may be formed between the bent portion 840 and the light source 600 as shown in FIG. 4 .
  • the metal plate 800 may include the lateral plane shown in FIG. 2 , and the gap G 1 may be formed between the lateral plane and the bent portion 840 of the metal plate 800 .
  • an area accommodated in discharging the heat of the light source 600 to the first receiving unit 900 may be substantially increased due to the gap G 1 , and temperature of the backlight assembly is thereby substantially lowered.
  • the third receiving unit may be disposed in the gap G 1 as shown in FIG. 4 .
  • the third receiving unit 400 may include a first portion, a second portion, a third portion, a fourth portion, a fifth portion, a first bending portion 410 , a second bending portion 420 , a third bending portion 430 and a fourth bending portion 440 and be bent four times and disposed in the gap G 1 .
  • the first bending portion 410 connects the first portion and the second portion
  • the second bending portion 420 connects the second portion and the third portion
  • the third bending portion 430 connects the third portion and the fourth portion and the fourth bending portion 440 connects the fourth portion and the fifth portion.
  • the third receiving unit may include a U-shaped portion, e.g., the second portion, the third portion, fourth portion, the second bending portion 420 and the third bending portion 430 connected one another, and the first portion and the fifth portion are connected to the U-shaped portion.
  • the first portion which is a bent portion in an exemplary embodiment, is disposed between the optical sheets 500 and LC panel 200 .
  • the first portion, the second portion, the first bending portion 410 and the second bending portion 420 of the third receiving unit 400 may cover at least a portion of the optical sheets 500 , the light source 600 and the light guide plate 700 along with the first receiving unit 900 and thereby restrict movement of the optical sheets 500 , the light source 600 and the light guide plate 700 .
  • the second receiving unit 100 may cover at least a portion of the LC panel 200 along with the first portion 410 of the third receiving unit 400 .
  • the first bending portion 410 is connected to the second portion disposed adjacent to one of the light source 600 and the lateral plane 820 of FIG. 2 of the metal plate 800 .
  • the third portion is disposed on the second region of the bottom surface 910 and the fourth portion is disposed opposite the side wall 920 of the first receiving unit 900 .
  • the fifth portion connected to the fourth bending portion 440 is disposed on the bent portion 840 of the metal plate 800 and the side wall 920 of the first receiving unit 900 .
  • the third receiving unit 400 includes a U-shaped portion disposed in a space between the side wall 920 of the first receiving unit 900 and light source 600 as shown in FIG. 4 .
  • the U-shaped portion may be disposed in a space between the bent portion 840 of the metal plate 800 and lateral plane 820 of FIG. 2 of the metal plate 800 .
  • the U-shaped portion may extend in a horizontal direction, parallel to the bottom surface 910 of the first receiving unit 900 .
  • the whole shape of the third receiving unit 400 may vary to be disposed in a gap between the lateral plane 820 and the side wall 920 as shown in FIG. 2 and thereby effectively prevent departing of the light source 600 and the LC panel 200 from the display device due to external impact along with the second receiving unit 100 .
  • the third receiving unit 400 may be disposed between the lateral plane 820 and the bent portion 840 of the metal plate 800 when the metal plate further includes the lateral plane 820 disposed between the third receiving unit 400 and the light source 600 .
  • the third receiving unit may include plastic material, and be referred to as the middle mold frame.
  • FIG. 5 is a partial cross-sectional view of still another exemplary embodiment of the metal plate 800 of the display panel shown in FIG. 2 .
  • the display device in FIG. 5 is substantially the same as the display device shown in FIG. 4 except that the first receiving unit 900 includes the hole 930 disposed in the bottom surface 910 and a protrusion 830 extending from the bottom plane 810 of the metal plate 800 through the hole 930 , and thereby dissipates the heat of the metal plate 800 to the outside substantially effectively.
  • the same or like elements shown in FIG. 5 have been labeled with the same reference characters as used above to describe the embodiment of display device shown in FIG. 4 , and any repetitive detailed description thereof will hereinafter be omitted.
  • One or more embodiments of the display device include a backlight assembly including the third receiving unit 400 .
  • the third receiving unit 400 may be omitted according to the overall design of the LCD.
  • One or more embodiments of the LCD which do not include the third receiving unit 400 are shown in FIGS. 6 to 8 .
  • the same or like elements shown in FIGS. 6 to 8 have been labeled with the same reference characters as used above to describe the embodiments of the display device shown in FIGS. 1 to 5 , and any repetitive detailed description thereof will hereinafter be omitted or simplified.
  • FIG. 6 is an exploded perspective view illustrating another exemplary embodiment of a display device according to the present invention.
  • FIG. 7 is a partial cross-sectional view taken along line B-B′ of FIG. 6 .
  • FIG. 8 is a partial cross-sectional view illustrating another exemplary embodiment of a metal plate of the display device shown in FIG. 7 .
  • the embodiment of the display device includes a display assembly 1000 and a backlight assembly 2000 .
  • the display assembly 1000 includes a LC panel 200 , driver circuits 300 a and 300 b and a second receiving unit 100 .
  • the LC panel 200 includes a color filter substrate and a TFT substrate. As shown in FIG.
  • the backlight assembly 2000 may include a light source 600 , a light guide plate 700 disposed adjacent to the light source 600 , a reflective sheet 710 disposed below the light guide plate 700 , optical sheets 500 disposed above the light guide plate 700 , a first receiving unit 900 accommodating the reflective sheet 710 , the light guide plate 700 and the optical sheets 500 , and a metal plate 800 which dissipates heat generated from the light source.
  • the light source 600 includes a printed circuit board 620 and a light emitting diode 610 disposed on the printed circuit board 620 .
  • the light emitting diode 610 emits white light or light having one color of the red, green and blue.
  • the printed circuit board 620 may discharge heat generated from the light emitting diode 610 to outside and apply a predetermined voltage to the light emitting diode 610 disposed on the printed circuit board 620 .
  • a groove may be formed in a predetermined portion of the printed circuit board 620 , and the light emitting diode may be disposed in the groove such that the printed circuit board 620 surrounds at least a portion of the light emitting diode 610 and provides a reflective surface thereto, thereby maximizes light efficiency.
  • at least one light emitting diode 610 may be disposed on the printed circuit board 620 .
  • the light source 600 may be disposed on side walls 920 of the first receiving unit 900 disposed opposite to, e.g., facing, each other. In another embodiment, the light source 600 may be disposed on one side wall 920 of the first receiving unit 900 . In another embodiment, the light sources 600 may be disposed on four of the side walls 920 of the first receiving unit 900 and thereby surround the light guide plate 700 . The number of light sources may vary based on a size and type of a device including the display device, for example, cellular phone, monitor, laptop computer and television set.
  • a lateral plane 820 of the metal plate 800 contacts the side wall 920 of the first receiving unit 900
  • the bottom surface 910 of the first receiving unit 900 contacts the bottom plane 810 of the metal plate 800 .
  • the display device in FIG. 8 is substantially the same as the display device shown in FIG. 7 except that the first receiving unit 900 includes a hole 930 disposed in the bottom surface 910 and a protrusion 830 extending from the bottom plane 810 of the metal plate 800 through the hole 930 , and thereby dissipates the heat of the metal plate 800 to the outside substantially effectively.
  • FIG. 8 The same or like elements shown in FIG. 8 have been labeled with the same reference characters as used above to describe the embodiment of display device shown in FIG. 7 , and any repetitive detailed description thereof will hereinafter be omitted.

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  • Physics & Mathematics (AREA)
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  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
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  • Liquid Crystal (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
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JP2014197560A (ja) 2014-10-16
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US20130265526A1 (en) 2013-10-10
EP2214050A1 (en) 2010-08-04
EP2214050B1 (en) 2016-05-04
JP2010177190A (ja) 2010-08-12
CN101858533A (zh) 2010-10-13
TWI515489B (zh) 2016-01-01
JP5583982B2 (ja) 2014-09-03
US9194571B2 (en) 2015-11-24
USRE49458E1 (en) 2023-03-14
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CN101858533B (zh) 2016-02-24
JP2016058403A (ja) 2016-04-21

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