CN101276098A - Backlight unit and liquid crystal display device having the same - Google Patents

Backlight unit and liquid crystal display device having the same Download PDF

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Publication number
CN101276098A
CN101276098A CNA200810088363XA CN200810088363A CN101276098A CN 101276098 A CN101276098 A CN 101276098A CN A200810088363X A CNA200810088363X A CN A200810088363XA CN 200810088363 A CN200810088363 A CN 200810088363A CN 101276098 A CN101276098 A CN 101276098A
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CN
China
Prior art keywords
light unit
back light
electroluminescent lamps
unit according
liquid crystal
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.)
Pending
Application number
CNA200810088363XA
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Chinese (zh)
Inventor
元世昌
金德洙
金民注
金银珠
权赫灿
韩载政
李东锡
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.)
LG Display Co Ltd
Original Assignee
LG Philips LCD Co Ltd
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Filing date
Publication date
Application filed by LG Philips LCD Co Ltd filed Critical LG Philips LCD Co Ltd
Publication of CN101276098A publication Critical patent/CN101276098A/en
Pending legal-status Critical Current

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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
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

A backlight unit for slimmed structure and exhibiting uniform brightness through the improvement of its luminance efficiency and the quality in appearance of which is improved by the removal of bright lines, and a liquid crystal display device having the same are disclosed. The backlight unit includes a plurality of light emitting lamps disposed above a cover bottom such that the light emitting lamps are arranged at regular intervals, a diffusion plate disposed above the light emitting lamps, the diffusion plate including a substrate, a light control part formed on the bottom surface of the substrate corresponding to the light emitting lamps, and lens parts mounted on the top surface of the substrate, and an optical film disposed above the diffusion plate.

Description

Back light unit and liquid crystal indicator with this back light unit
Technical field
The present invention relates to back light unit, more specifically, relate to back light unit and have the liquid crystal indicator of this back light unit, the structure that this back light unit is used to approach (slimmed structure) and show high brightness by the raising of its luminescence efficiency and the presentation quality that improves by removal bright line (bright line).
Background technology
A kind of as normally used display device, cathode ray tube (CRT) is mainly used in the monitor of television receiver (TV) and surveying instrument or information terminal.Yet CRT has heavier weight and large scale relatively.Thereby CRT can not satisfy the current demand of small size and light weight.
Therefore, proposed to come replaced C RT device such as the liquid crystal indicator that utilizes the electroptics effect (LCD), the panel display apparatus that utilizes the plasma display panel device (PDP) of gas discharge and utilize the el display device (ELD) of electroluminescence effect.In the middle of them, LCD has been carried out a lot of research.
Liquid crystal indicator is compared thinner and lighter with any other display device, and it requires power consumption still less.Recently, the exploitation of liquid crystal indicator has reached to be enough to the degree of this liquid crystal indicator as panel display apparatus, consequently, the monitor of desktop PC and large-scale information display device and the monitor of laptop computer this liquid crystal indicator have been used for.Therefore, the demand to liquid crystal indicator continues to increase.
Liquid crystal indicator is non-light emitting display, and it is by to regulating display image from outside quantity of incident light, and therefore, this liquid crystal indicator need be used for the additional source of light to LCD plate irradiates light, that is, and and back light unit.
In general, based on the arrangement of column (cylindrical) fluorescent light, the back light unit that is used as the light source of liquid crystal indicator can be categorized as direct type (direct-type) back light unit or peripheral type (edge-type) back light unit.
Wherein the lamp unit is installed in the structure of the side of the light guide plate that is used for leaded light, construct the peripheral type back light unit.This lamp unit comprises: be used for alight; Be fixed on the lamp socket that is used to protect this lamp (lamp holder) of the opposite end of this lamp; And the lamp reflecting plate that surrounds the periphery of this lamp, the side with this lamp reflecting plate is assembled in the side of this light guide plate simultaneously, is used for towards the light of this light guide plate reflection from this lamp emission.
To be constructed to make the peripheral type back light unit that this lamp unit is installed in the side of this light guide plate to be applied to undersized relatively liquid crystal indicator, for example monitor of the monitor of laptop computer and desktop PC.The peripheral type back light unit shows higher optical uniformity and permanance, and the peripheral type back light unit is favourable for making the liquid crystal indicator attenuation of having used the peripheral type back light unit.
On the other hand, the size along with liquid crystal indicator is increased to above 20 feet the concentrated direct type back light unit of having developed.Wherein to arrange a plurality of lamps in the bottom of diffusing panel with to the front of the LCD plate structure of (directly) irradiates light directly, construct direct type back light unit along straight line.
Compare with the peripheral type back light unit, direct type back light unit shows higher optical efficiency.Therefore, direct type back light unit mainly is used in needs in other large-scale liquid crystal indicator of high brightness levels.
Yet, to compare with the liquid crystal indicator of the employing peripheral type back light unit that is used for laptop computer, the liquid crystal indicator that is used for the employing direct type back light unit of large-scale monitor or large-scale tv receiver will use the longer period usually.In addition, compare, adopt the liquid crystal indicator of direct type back light unit to have more lamp with the liquid crystal indicator that adopts the peripheral type back light unit.As a result, compare with the liquid crystal indicator that adopts the peripheral type back light unit, in the liquid crystal indicator that adopts direct type back light unit, higher because of damaging the non-luminous possibility of some lamps that causes with the life-span of these lamps.
In the liquid crystal indicator that adopts direct type back light unit, the milky resin (for example acrylic acid or polycarbonate) that will be mixed with diffusion agent (diffusion agent) by the extrusion molding (extruding molding) that utilizes roller form tabular and on this plate of extruding impressing pattern, make this diffusing panel.
Yet even above-mentioned diffusing panel is arranged in the liquid crystal indicator, in the zone that is provided with lamp and be not provided with between all the other zones of lamp and also luminance difference can occur, the result can not be implemented in the uniform luminance in whole back light unit and the liquid crystal indicator.
In addition, even above-mentioned diffusing panel is arranged in the liquid crystal indicator, the shape that is arranged on the lamp below this diffusing panel also can appear at the top,, bright line occurs at the top, result, the presentation quality deterioration of back light unit and liquid crystal indicator that is.
Summary of the invention
Therefore, the present invention is devoted to a kind of back light unit and has the liquid crystal indicator of this back light unit, and it has eliminated one or more problem that causes owing to the restriction of prior art and shortcoming basically.
An object of the present invention is, a kind of back light unit and the liquid crystal indicator with this back light unit are provided, this back light unit shows uniform luminance by the raising of its luminescence efficiency and the presentation quality that improves by the removal bright line.
Other advantage of the present invention, purpose and feature will partly be set forth in the following description book, and for those skilled in the art, will be by following instructions being studied and partly being become clear, perhaps can be by practice of the present invention is learnt.These purposes of the present invention and other advantage can realize by the structure of specifically noting in printed instructions, claims and accompanying drawing and obtain.
In order to realize these purposes and other advantage, and according to purpose of the present invention, to implement and broadly described as institute here is concrete, a kind of back light unit comprises: a plurality of electroluminescent lamps, it is arranged on the top of covering the end, so that described a plurality of electroluminescent lamp is with arranged at regular intervals; Diffusing panel, it is arranged on the top of described a plurality of electroluminescent lamps, described diffusing panel comprises substrate, be formed on described substrate with the corresponding bottom surface of described a plurality of electroluminescent lamps on the photocontrol part, and be installed in lens component on the end face of described substrate; And blooming, it is arranged on the top of described diffusing panel.
Preferably, described photocontrol partly comprises reflection graphic patterns or scattering pattern.
In another aspect of this invention, a kind of liquid crystal indicator comprises back light unit and liquid crystal board, and this back light unit comprises: a plurality of electroluminescent lamps, and it is arranged on the top of covering the end, so that described a plurality of electroluminescent lamp is with arranged at regular intervals; Diffusing panel, it is arranged on the top of described a plurality of electroluminescent lamps, and described diffusing panel comprises transparency carrier, is formed on the bottom of described substrate, the photocontrol part with reflection graphic patterns or scattering pattern and the lens component that is installed in the top of described substrate accordingly with described a plurality of electroluminescent lamps; And blooming, it is arranged on the top of described diffusing panel, this liquid crystal board is arranged on the top of described back light unit, described liquid crystal board comprises upper substrate connected to one another and infrabasal plate, described upper substrate of while and described infrabasal plate each interval preset distance are with filling liquid crystal in the space between described upper substrate and described infrabasal plate.
Should be appreciated that, all be exemplary and explanat to above general introduction of the present invention and following detailed description, and be intended to provide further instruction the present invention for required protection.
Description of drawings
Comprise accompanying drawing to provide, incorporate accompanying drawing into and constitute the application's a part that accompanying drawing shows embodiments of the present invention and is used from instructions one explains principle of the present invention to further understanding of the present invention.In the accompanying drawings:
Fig. 1 shows the sectional view of structure of the back light unit of first embodiment of the invention;
Fig. 2 A and 2B show the figure of structure in reflection horizon of diffusing panel of the back light unit of first embodiment of the invention;
Fig. 3 shows the sectional view of the structure of back light unit second embodiment of the invention;
Fig. 4 A and 4B show the figure of structure in reflection horizon of the diffusing panel of back light unit second embodiment of the invention;
Fig. 5 shows the sectional view of structure of the liquid crystal indicator of the back light unit that comprises first embodiment of the invention;
Fig. 6 shows the sectional view of the structure of the liquid crystal indicator that comprises back light unit second embodiment of the invention;
Fig. 7 shows the exploded perspective view according to the direct type liquid crystal indicator of the 3rd embodiment of the present invention;
Fig. 8 is the sectional view along the direct type liquid crystal indicator of the I-I ' line intercepting of Fig. 7;
Fig. 9 shows the stereographic map according to the diffusing panel of the 3rd embodiment of the present invention;
Figure 10 shows the planimetric map of bottom of the diffusing panel of Fig. 9; And
Figure 11 A shows planimetric map according to the bottom of the diffusing panel of the 4th to the 7th embodiment of the present invention respectively to 11D.
Embodiment
Describe preferred implementation of the present invention now in detail, the example of these embodiments is described in the accompanying drawings.In the accompanying drawings, will use identical Reference numeral to indicate identical or similar part as much as possible.
First embodiment
At first, the back light unit to first embodiment of the invention is elaborated.
Fig. 1 shows the sectional view of structure of the back light unit of first embodiment of the invention, and Fig. 2 A and 2B show the figure of structure in reflection horizon of diffusing panel of the back light unit of first embodiment of the invention.
As shown in Figure 1, the structure of arranging these electroluminescent lamps 13 at interval wherein a plurality of electroluminescent lamps 13 are arranged on the top of covering the end 11 so that with rule is constructed the back light unit of first embodiment of the invention.
Can use electroluminescent cell (EL), light emitting diode (LED), cold-cathode fluorescence lamp (CCFL), hot-cathode fluorescent lamp (HCFL) or external electrode fluorescent lamp (EEFL) as electroluminescent lamp 13.
Be provided with diffusing panel 14 above electroluminescent lamp 13, diffusing panel 14 is used for the light from electroluminescent lamp 13 emissions is carried out scattering, upwards to transmit light equably.
Be provided with blooming 15 above diffusing panel 14, blooming 15 is used for upwards transmitting the light through scattering.
Above the lid end 11, be provided with reflecting plate 12.Although not shown in the drawings, can construct the blooming 15 of the top that is arranged on diffusing panel 14 according to the structure of in turn stacked (stack) first and second prismatic lenses and diaphragm wherein.
14 pairs of light from electroluminescent lamp 13 incidents of diffusing panel carry out scattering, to prevent the concentration of local of this light.
Below, the structure of the diffusing panel in the said modules of this back light unit 14 is elaborated.Diffusing panel 14 comprises: substrate 14a, lens component 14b and reflecting part 14c.
Substrate 14a is made greater than 80% transparent material by transmissivity.Preferably, substrate 14a is made greater than 90% transparent material by transmissivity, to satisfy top condition.
Specifically, the substrate 14a of diffusing panel 14 can be made by polymethylmethacrylate (PMMA), polycarbonate (PC), polystyrene (PS) or methyl methacrylate-styrene (MS).
Though can form lens component 14b according to the shape of lens, prism, pyramid or bulge-structure, in the accompanying drawings, lens component 14b is illustrated as the cross sectional shape that forms hemisphere.
For example, can arrange lens component 14b continuously or can arrange lens component 14b according to line structure according to dot structure.
Lens component 14b can be by making with substrate 14a identical materials.Alternatively, lens component 14b can be made by the transmissivity material different with the transmissivity of the material of substrate 14a.
From the part 14c reflection that is reflected of the light of electroluminescent lamp 13 emission, be set at reflecting plate 12 diffusions and the reflection of electroluminescent lamp 13 belows then, thus, the shape of electroluminescent lamp 13 can not appear on the diffusing panel 14.In the first embodiment, reflecting part 14c is arranged on each electroluminescent lamp 13 tops and is positioned at each electroluminescent lamp 13 corresponding positions.
Reflecting part 14c is that 50% to 95% material is made by transmissivity, for example TiO 2, Al 2O 3, MgO, Ba or Ag.
In this case, can change thickness and the shape of reflecting part 14c based on the degree of the transmissivity of the material that constitutes reflecting part 14c.
For example, if reflecting part 14c is made by the material that shows high reflection characteristic, then can arrange reflecting part 14c, shown in Fig. 2 A or 2B according to line structure or dot structure.On the other hand, if reflecting part 14c is made by the material that shows low reflection characteristic, then preferably arrange reflecting part 14c, shown in Fig. 2 A with line structure rather than dot structure.Yet said structure only shows example of the present invention.Therefore, even reflecting part 14c is made by the material that shows low reflection characteristic, also can arrange reflecting part 14c according to dot structure.
With when reflecting part 14c is made by the material that shows low reflection characteristic, compare, when reflecting part 14c is made by the material that shows high reflection characteristic, can reduce the thickness of reflecting part 14c.
If reflecting part 14c arranges with dot structure, then can form these points that constitute reflecting part 14c according to the rectangular shape shown in Fig. 2 B.Yet, can also form these points that constitute reflecting part 14c according to polygon (comprising triangle, pentagon and sexangle) or circular shape.
In having the back light unit of above-mentioned structure, light sends from electroluminescent lamp 13, then by diffusing panel 14 and blooming 15 and by diffusion with converge.Then, this light upwards transmits.
At this moment, reflected downwards by the reflecting part 14c of diffusing panel 14 (it is positioned at electroluminescent lamp 13 tops and electroluminescent lamp 13 corresponding positions) from the light of electroluminescent lamp 13 emissions, and be reflected plate 12 of this light upwards transmits, and thus, has prevented that effectively the shape of electroluminescent lamp 13 from appearing at the top.
Hereinafter, will the liquid crystal indicator that comprise the back light unit with above-mentioned structure be described.
Fig. 5 shows the sectional view of structure of the liquid crystal indicator of the back light unit that comprises first embodiment of the invention.
As shown in Figure 5, liquid crystal indicator according to the present invention comprises liquid crystal board 50 and is arranged on the back light unit of liquid crystal board 50 belows, this liquid crystal board 50 comprises upper substrate 51 connected to one another and infrabasal plate 52, and upper substrate 51 and infrabasal plate 52 each interval preset distances, and filling liquid crystal layer 53 in the space between upper substrate 51 and infrabasal plate 52.
The structure of this back light unit of being arranged on liquid crystal board 50 belows is illustrated before this, therefore, it is not further described in detail with reference to Fig. 1.
Although not shown in the drawings, infrabasal plate 52 is constructed as follows.Along a direction many select liness are set on infrabasal plate 52 at interval with rule, to limit pixel region.Along the direction vertical many data lines are set on infrabasal plate 52 at interval with rule with select lines.Form pixel electrode at these select liness and these data lines pixel region place intersected with each other.In addition, the infall between these select liness and these data lines forms thin film transistor (TFT) (TFT).
On upper substrate 51, form: be used to stop black matrix layer from the light in the zone beyond the pixel region with the lower part; Be used for the RGB color-filter layer that color is expressed; And the public electrode that is used to realize picture.
Can construct each thin film transistor (TFT) (TFT) according to various structures.For example, each TFT can comprise: from the outstanding grid of the select lines of correspondence; Be formed on whole lip-deep gate insulating film; The active layer that above this grid, on gate insulation layer, forms; From the outstanding source electrode of corresponding data line; And the drain electrode that relatively is provided with this source electrode.
Pixel electrode is made by the transparent conductive metal material that shows relative high light transmissivity (such as indium tin oxide (ITO)).
By the signal that applies from these thin film transistor (TFT)s (TFT), the liquid crystal layer that is positioned on these pixel electrodes is carried out orientation (orient), and according to the degree of orientation (degree oforientation) of liquid crystal layer, control light quantity, represent picture thus through liquid crystal layer.
Switch (in-plane switching) mode LCD in the face though also can use, in the above description, advised the structure of general T N mode LCD.
In above-mentioned liquid crystal indicator, light is from electroluminescent lamp 13 emission, then by diffusing panel 14 and blooming 15 by diffusion with converge.Subsequently, this light incides on the liquid crystal board 50.
Incident light arrives liquid crystal layer 53 by the infrabasal plate 52 of liquid crystal board 50.
At this moment, from part 14c (it is formed on the bottom of the diffusing panel 14) reflection downwards that is reflected of the light of electroluminescent lamp 13 emission, and this light plate 12 that is reflected upwards transmits, and thus, prevented that effectively the shape of electroluminescent lamp 13 from appearing at the top.
The present invention is not limited to above-mentioned embodiment, but has comprised the various forms that those skilled in the art in the invention can easily derive according to this embodiment.
Simultaneously, the back light unit of first embodiment of the invention can be used as the back side or the positive light source of locating that is positioned at various display device (comprising above-mentioned liquid crystal indicator).In addition, can be with this back light unit independently as light-emitting device.
Second embodiment
At first, the back light unit according to second embodiment of the invention is elaborated.
Fig. 3 shows the sectional view of the structure of back light unit second embodiment of the invention, and Fig. 4 A and 4B show the figure of structure in reflection horizon of the diffusing panel of back light unit second embodiment of the invention.
As shown in Figure 3, wherein a plurality of electroluminescent lamps are arranged on the top of covering the end 31 so that, construct back light unit second embodiment of the invention with the structure of arranged at regular intervals electroluminescent lamp 33.
Can use electroluminescent cell (EL), light emitting diode (LED), cold-cathode fluorescence lamp (CCFL), hot-cathode fluorescent lamp (HCFL) or external electrode fluorescent lamp (EEFL) as electroluminescent lamp 33.
Be provided with diffusing panel 34 above electroluminescent lamp 33, diffusing panel 34 is used for the light from electroluminescent lamp 33 emissions is carried out scattering, upwards to transmit this light equably.
Be provided with blooming 35 above diffusing panel 34, blooming 35 is used for upwards transmitting the light through scattering.
Above the lid end 31, be provided with reflecting plate 32.Although it is not shown in the drawings,, can construct the blooming 35 of the top that is arranged on diffusing panel 34 according to the structure of in turn stacked first and second prismatic lenses and diaphragm wherein.
34 pairs of light from electroluminescent lamp 33 incidents of diffusing panel carry out scattering, to prevent the concentration of local of this light.
Below, the structure of the diffusing panel in the said modules of this back light unit 34 is elaborated.Diffusing panel 34 comprises: substrate 34a, lens component 34b and reflecting part 34c.
Substrate 34a is made greater than 80% transparent material by transmissivity.Preferably, substrate 34a is made greater than 90% transparent material by transmissivity, to satisfy top condition.
Specifically, the substrate 34a of diffusing panel 34 can be made by polymethylmethacrylate (PMMA), polycarbonate (PC), polystyrene (PS) or methyl methacrylate-styrene (MS).
Though can form lens component 34b according to the shape of lens, prism, pyramid or bulge-structure, in the accompanying drawings, the cross sectional shape that lens component 34b is illustrated as with hemisphere forms.
For example, can arrange lens component 34b continuously or can arrange lens component 34b according to line structure according to dot structure.
Lens component 34b can be by making with substrate 34a identical materials.Alternatively, lens component 34b can be made by the transmissivity material different with the transmissivity of the material of substrate 34a.
From the part 34c reflection that is reflected of the light of electroluminescent lamp 33 emission, be set at reflecting plate 32 diffusions and the reflection of electroluminescent lamp 33 belows then, thus, the shape of electroluminescent lamp 33 can not appear on the diffusing panel 34.
In second embodiment, reflecting part 34c is arranged so that reflecting part 34c is positioned at directly over each electroluminescent lamp 33 and near each electroluminescent lamp 33.Position directly over reflecting part 34c is positioned at each electroluminescent lamp 33, reflecting part 34c has breadth extreme, and along with the increase of each electroluminescent lamp 33 distances, the width of reflecting part 34c reduces gradually.
In addition, though it is not shown in the drawings, but reflecting part 34c is constructed to such structure, in this structure, the closeer therebetween or broad of longitudinal direction reflecting part 34c along electroluminescent lamp 33, and the width of reflecting part 34c reduces gradually towards the edge of electroluminescent lamp 33, so that at the width of the reflecting part 34c of the edge of electroluminescent lamp 33 width less than the reflecting part 34c at place in the middle of these electroluminescent lamps 33.
This be because the brightness located therebetween of electroluminescent lamp 33 greater than the brightness of electroluminescent lamp 33 in its edge, the result, the place produces lamp more significantly than the edge at electroluminescent lamp 33 and phenomenon occurs in the middle of electroluminescent lamp 33.
Reflecting part 34c is that 50% to 95% material is made by transmissivity, such as TiO 2, Al 2O 3, MgO, Ba or Ag.
In this case, can change thickness and the shape of reflecting part 34c based on the degree of the transmissivity of the material that constitutes reflecting part 34c.
For example, if reflecting part 34c is made by the material that shows high reflection characteristic, then can arrange reflecting part 34c, shown in Fig. 4 A or 4B according to line structure or dot structure.On the other hand, if reflecting part 34c is made by the material that shows low reflection characteristic, then preferably arrange reflecting part 34c, shown in Fig. 4 A with line structure rather than with dot structure.Yet,, also can arrange reflecting part 34c according to dot structure even reflecting part 34c is made by the material that shows low reflection characteristic.
Shown in Fig. 4 B, when arranged with dot structure reflecting part 34, for each electroluminescent lamp 33, on the longitudinal direction of reflecting part 34, reflecting part 34 was not only located therebetween but also is all had same widths in the both sides of opening with its midfeather.Alternatively, reflecting part 34 is constructed to make the both sides of vertical width orientating reflex part 34 of reflecting part 34 to reduce gradually.
With when reflecting part 34c is made by the material that shows low reflection characteristic, compare, when reflecting part 34c is made by the material that shows high reflection characteristic, can reduce the thickness of reflecting part 34c.
If reflecting part 34c arranges with dot structure, then can form these points that constitute reflecting part 34c according to the rectangular shape shown in Fig. 4 B.Yet, can also form these points that constitute reflecting part 34c according to polygon (comprising triangle, pentagon and sexangle) or circular shape.
In having this back light unit of above-mentioned structure, light sends from electroluminescent lamp 33, then by diffusing panel 34 and blooming 35 and by diffusion with converge.Then, this light upwards transmits.
At this moment, reflected downwards by the reflecting part 34c of diffusing panel 34 (it is positioned at electroluminescent lamp 33 tops and electroluminescent lamp 33 corresponding positions) from the light of electroluminescent lamp 33 emissions, and be reflected plate 32 of this light upwards transmits, and thus, has prevented that effectively the shape of electroluminescent lamp 33 from appearing at the top.
Below, the liquid crystal indicator that comprises this back light unit with above-mentioned structure is described.
Fig. 6 shows the sectional view of the structure of the liquid crystal indicator that comprises back light unit second embodiment of the invention.
As shown in Figure 6, liquid crystal indicator according to the present invention comprises liquid crystal board 60 and is arranged on the back light unit of liquid crystal board 60 belows, this liquid crystal board 60 comprises upper substrate 61 connected to one another and infrabasal plate 62, and upper substrate 61 and infrabasal plate 62 each interval preset distances, and filling liquid crystal layer 63 in the space between upper substrate 61 and infrabasal plate 62.
The structure of this back light unit of being arranged on liquid crystal board 60 belows is illustrated before this, therefore, it is not further described in detail with reference to Fig. 3.
Although not shown in the drawings, infrabasal plate 62 is constructed as follows.Along a direction many select liness are set on infrabasal plate 62 at interval with rule, to limit pixel region.Along the direction vertical many data lines are set on infrabasal plate 62 at interval with rule with select lines.Form pixel electrode at these select liness and these data lines pixel region place intersected with each other.In addition, the infall between these select liness and these data lines forms thin film transistor (TFT) (TFT).
On upper substrate 61, form: be used to stop black matrix layer from the light in the zone beyond the pixel region; Be used for the RGB color-filter layer that color is expressed; And the public electrode that is used to realize picture.
Can construct each thin film transistor (TFT) (TFT) according to various structures.For example, each TFT can comprise: from the outstanding grid of the select lines of correspondence; The gate insulating film that on its whole surface, forms; The active layer that above grid, is forming on the gate insulation layer; From the outstanding source electrode of corresponding data line; And the drain electrode that relatively is provided with source electrode.
Pixel electrode is made by the transparent conductive metal material that shows relative high light transmissivity (such as indium tin oxide (ITO)).
By the signal that applies from these thin film transistor (TFT)s (TFT), the liquid crystal layer that is positioned on these pixel electrodes is carried out orientation, and, control light quantity through this liquid crystal layer according to the degree of orientation of liquid crystal layer, represent picture thus.
Though also can use in-plane switching mode liquid crystal display device, in the above description, advise the structure of general T N mode LCD.
The 3rd embodiment
Fig. 7 shows the exploded perspective view according to the direct type liquid crystal indicator of the 3rd embodiment of the present invention, and Fig. 8 is the sectional view along the direct type liquid crystal indicator of the I-I ' line of Fig. 7 intercepting.
Shown in Fig. 7 and 8, comprise according to the direct type liquid crystal indicator of the 3rd embodiment of the present invention: the LCD panel 100 of display image on it; And the back light unit that is used for irradiates light 120 that is arranged on the back of LCD panel 100.
LCD panel 100 comprises thin film transistor (TFT) connected to one another (TFT) substrate and filter substrate, and be plugged in liquid crystal layer between this TFT substrate and this filter substrate, wherein this TFT substrate and this filter substrate toward each other so that between this TFT substrate and this filter substrate, keep uniform cell gap.
Although not shown in the drawings, be provided with driver element 110 and 111 in the side of LCD panel 100, it is used to generate drive signal to drive LCD panel 100.
Be mounted under the situation of size greater than the direct type back light unit in 20 inches the large-scale liquid crystal indicator at this back light unit of supposition, the back light unit 120 according to the 3rd embodiment of the present invention is described.
Back light unit 120 comprises: have open-topped box-like bottom 180; Be arranged on a plurality of light sources 150 on the bottom 180, so that arrange light source 150 at interval with rule; Be arranged on the diffusing panel 200 that is used for light is carried out elementary diffusion on the light source 150; Be provided with and be used on the diffusing panel 200 light is converged optical sheet 130 with secondary diffusion; And be arranged on light source 150 belows and be used for the reflector plate 170 that will reflect towards LCD panel 100 downwards from the light that light source 150 is propagated.
Back light unit 120 also comprises first and second light source driving units 160a and the 160b of the opposite end that is arranged on light source 150, and it is used to provide drive signal.The first light source driving units 160a comprises that first drives printed circuit board (PCB) (PCB) 162a and a plurality of first sockets (socket) 164a that is installed on the first driving PCB 162a, so that each first socket 164a contacts with an end of each light source 150.Secondary light source driver element 160b comprises the second driving PCB 162b and a plurality of second socket 164b that are installed on the second driving PCB 162b, so that each second socket 164b contacts with the other end of each light source 150.
Back light unit 120 also comprises first and second support edge 140a and the 140b of the opposite end that is arranged on light source 150, and it is used for the edge from light source 150 guiding light emitted to LCD panel 100 is supported diffusing panel 200 and optical sheet 160 simultaneously.
The 3rd embodiment of the present invention is described to comprise external electrode fluorescent lamp (EEFL), and is constructed to the structure around the perimeter of the opposite end of light source 150 of its electrode wherein.Yet the 3rd embodiment of the present invention is not limited to EEFL, but can comprise cold-cathode fluorescence lamp (CCFL) or light emitting diode (LED).
Diffusing panel 200 is used for the light from light source 150 emissions is carried out elementary diffusion, and will guide towards optical sheet 130 through the light of elementary diffusion.
Diffusing panel 200 is provided with reflection graphic patterns 203 in its bottom, and light source 150 is arranged on diffusing panel 200 belows.(ink printing) forms reflection graphic patterns 203 by the ink printing.
Reflection graphic patterns 203 has reservation shape (for example, diamond shape).Can the material of the silver (Ag) of highly reflective as reflection graphic patterns 203 will be shown.
The single pattern dimension that is formed on diffusing panel 200 bottoms and light source 150 corresponding reflection graphic patterns 203 greater than be formed on diffusing panel 200 bottoms not with the single pattern dimension of the reflection graphic patterns 203 of light source 150 corresponding positions.
Diffusing panel 200 have different density with the regional corresponding bottom with light source 150 is not set regional corresponding bottom that is provided with light source 150 and diffusing panel 200.Specifically, the density with the regional corresponding reflection graphic patterns 203 that is provided with light source 150 compares and regional corresponding reflection graphic patterns 203 height that light source 150 is not set.
Below, with reference to Fig. 9 and 10, the diffusing panel 200 of the third embodiment of the invention of basis is elaborated.
Fig. 9 shows the stereographic map according to the diffusing panel of the 3rd embodiment of the present invention, and Figure 10 shows the planimetric map of bottom of the diffusing panel of Fig. 9.
As shown in Figures 9 and 10, the diffusing panel 200 according to the 3rd embodiment of the present invention is provided with a plurality of prismatic patterns 201 accordingly at its top and optical sheet 130 (referring to Fig. 8).In addition, diffusing panel 200 is provided with the have different densities reflection graphic patterns 203 of (depending on its zone) in its bottom accordingly with light source 150.
Reflection graphic patterns 203 has diamond shape.The material (such as silver (Ag)) that shows highly reflective by printing forms reflection graphic patterns 203.Have under the situation that diamond shape and reflection graphic patterns 203 made by silver (Ag) at supposition reflection graphic patterns 203, the 3rd embodiment of the present invention is described.Yet, the invention is not restricted to above-mentioned condition.For example, reflection graphic patterns 203 can have different shape, such as triangle, rectangle or circle.In addition, reflection graphic patterns 203 can be made by any material that shows highly reflective.
The rhombus size of reflection graphic patterns 203 from light source 150 corresponding zones to not reducing gradually with light source 150 corresponding zones.Promptly, the reflection graphic patterns 203 that is formed on the place, bottom of diffusing panel 200 has full-size with light source 150 corresponding location, and do not have minimum dimension with light source 150 corresponding location, thus, reflection graphic patterns 203 is regulated the light quantity that is transmitted, to realize the even light transmission at each zone.
In other words, the reflection graphic patterns 203 of diffusing panel 200 be adjusted in light source 150 corresponding zones and not with the density in light source 150 corresponding zones, to regulate the light quantity that is transmitted.
Place, top at diffusing panel 200 forms the prismatic pattern 201 with peak (crest) and paddy (valley).In prismatic pattern 201, make the top at each peak become circle (round).
Prismatic pattern 201 extends along the longitudinal direction of light source 150.
In direct type liquid crystal indicator with above-mentioned structure according to the 3rd embodiment of the present invention, it is bigger than the zone that light source 150 is not set therein that the density of reflection graphic patterns 203 that is formed on the bottom of diffusing panel 200 is provided with the zone of light source 150 therein, thus, back light unit 120 can be constructed so that back light unit 120 has uniform luminance.
In addition, reflection graphic patterns 203 is formed on the bottom of diffusing panel 200, and therefore, the distance between diffusing panel 200 and the light source 150 reduces.Thereby, can reduce the gross thickness of back light unit 120, therefore, the structure that liquid crystal indicator can be configured to approach.
The the 4th to the 7th embodiment
Figure 11 A shows planimetric map according to the bottom of the diffusing panel of the 4th to the 7th embodiment of the present invention respectively to 11D.
With reference to Figure 11 A, comprise according to the diffusing panel of the 4th embodiment of the present invention being formed on its bottom and light source 150 corresponding scattering pattern 303 that it is used for light is carried out scattering.
Scattering pattern 303 is set for light is carried out scattering.Scattering pattern 303 be provided so that with the density of the scattering pattern 303 in light source 150 corresponding zones greater than not with the density of the scattering pattern 303 in light source 150 corresponding zones.
Form scattering pattern 303 by typography.Scattering pattern 303 comprises scattering material (for example, acrylic based resin or transparent resin), so that light is carried out scattering.
With shape or the round-shaped scattering pattern 303 that forms with at least three limits.
With reference to Figure 11 B, comprise having difform first to the 3rd scattering pattern 403a, 403b and 403c according to the diffusing panel of the 5th embodiment of the present invention.
First to the 3rd scattering pattern 403a, 403b and 403c be provided so that with the pattern dimension of first to the 3rd scattering pattern 403a, the 403b in light source 150 corresponding zones and 403c with not different with the pattern dimension of first to the 3rd scattering pattern 403a, the 403b in light source 150 corresponding zones and 403c, and with the density of first to the 3rd scattering pattern 403a, the 403b in light source 150 corresponding zones and 403c greater than not with first to the 3rd scattering pattern 403a, the 403b in light source 150 corresponding zones and the density of 403c.
With reference to Figure 11 C, comprise having difform first and second scattering pattern 503a and the 503b according to the diffusing panel of the 6th embodiment of the present invention.
Longitudinal direction along light source 150 alternately forms first and second scattering pattern 503a and the 503b at interval with rule.In addition, alternately form first and second scattering pattern 503a and the 503b along the direction vertical (arranging the direction of light source) at interval with rule with the longitudinal direction of light source 150.
The first and second scattering pattern 503a and 503b be provided so that not with the density of the first and second scattering pattern 503a in light source 150 corresponding zones and 503b greater than with the first and second scattering pattern 503a in light source 150 corresponding zones and the density of 503b.
With reference to Figure 11 D, comprise the scattering pattern 603a and first and second reflection graphic patterns 603b and the 603c according to the diffusing panel of the 7th embodiment of the present invention, these patterns have difformity and alternately are provided with along the longitudinal direction of light source 150.
Scattering pattern 603a be provided so that not with the density of the scattering pattern 603a in light source 150 corresponding zones greater than with the density of the scattering pattern 603a in light source 150 corresponding zones.In addition, the first and second reflection graphic patterns 603b and 603c be provided so that with the density of the first and second reflection graphic patterns 603b of light source 150 corresponding location and 603c greater than not with the first and second reflection graphic patterns 603b in light source 150 corresponding zones and the density of 603c.
Simultaneously, can be with above-mentioned embodiment of the present invention as the back side that is positioned at various display device (comprising above-mentioned liquid crystal indicator) or positive light source.In addition, can be with above-mentioned embodiment of the present invention independently as light-emitting device.
For those skilled in the art, clearly, can under the situation that does not break away from the spirit or scope of the present invention, carry out various modifications and variations to the present invention.
Thereby the present invention is intended to cover of the present invention various modifications and the modified example in the scope that falls into claims and equivalent thereof.
Can be well understood to according to foregoing description, according to back light unit of the present invention with have this back of the body The liquid crystal indicator of light unit has following effect.
The first, the substrate of diffusing panel is made by transparent material, has increased thus transmissivity, and therefore, Improved brightness.
The second, be arranged on the reflecting part corresponding with each electroluminescent lamp, the bottom of diffusing panel to from sending out The light of light modulation emission partly reflects, so that brightness uniformity and prevent these electroluminescent lamps Shape appears at the top, thus, has improved back light unit and the liquid crystal display with this back light unit The quality of the outward appearance of device.
The 3rd, the scattering pattern that is formed on the bottom of diffusing panel is provided so that light be not set Close greater than at the scattering pattern in the zone that is provided with light source of the density of the scattering pattern in the zone in source Degree thus, can be constructed so that this back light unit that the brightness of this back light unit is even.
The 4th, diffusing panel is provided with reflection graphic patterns and/or scattering pattern, result, diffusing panel and light source Between distance reduce, thus, can reduce the gross thickness of back light unit, therefore, can be with liquid Crystal device is configured to thin structure.
The application requires the right of priority of korean patent application No.2007-031598 that submitted on March 30th, 2007 and the korean patent application P2007-134015 that submitted on Dec 20th, 2007, it is incorporated into by reference at this.

Claims (20)

1, a kind of back light unit, this back light unit comprises:
A plurality of electroluminescent lamps, it is arranged on the top of covering the end, so that described a plurality of electroluminescent lamp is with arranged at regular intervals;
Diffusing panel, it is arranged on the top of described a plurality of electroluminescent lamps, and described diffusing panel comprises substrate, be formed on the bottom surface of described substrate and the corresponding photocontrol part of described a plurality of electroluminescent lamps, and is installed in a plurality of lens components on the end face of described substrate; And
Blooming, it is arranged on the top of described diffusing panel.
2, back light unit according to claim 1, wherein, described photocontrol partly comprises reflection graphic patterns or scattering pattern.
3, back light unit according to claim 2 wherein, with line structure or with the longitudinal direction of dot structure along described a plurality of electroluminescent lamps, forms described reflection graphic patterns with the corresponding position of described a plurality of electroluminescent lamps above described a plurality of electroluminescent lamps.
4, back light unit according to claim 2, wherein, with line structure or with the longitudinal direction of dot structure along described a plurality of electroluminescent lamps, corresponding with described a plurality of electroluminescent lamps and form described reflection graphic patterns above described a plurality of electroluminescent lamps near the position of described a plurality of electroluminescent lamps, and described reflection graphic patterns be configured such that with the density of the described reflection graphic patterns of the corresponding location of described a plurality of electroluminescent lamps than not with the density height of the described reflection graphic patterns of the corresponding location of described a plurality of electroluminescent lamps.
5, back light unit according to claim 4, wherein, described reflection graphic patterns is configured such that described reflection graphic patterns is the wideest directly over described a plurality of electroluminescent lamps, and the width of described reflection graphic patterns is along with reducing gradually with the increase of described a plurality of electroluminescent lamp distances.
6, back light unit according to claim 5, wherein, with line structure or with the longitudinal direction of dot structure along described a plurality of electroluminescent lamps, the position of corresponding with described a plurality of electroluminescent lamps and close described a plurality of electroluminescent lamps forms described reflection graphic patterns above described a plurality of electroluminescent lamps.
7, back light unit according to claim 6, wherein, when forming described reflection graphic patterns with described dot structure, described reflection graphic patterns comprises a plurality of polygon form points or a plurality of circular point.
8, back light unit according to claim 2, wherein, described scattering pattern be configured such that not with the density of the described scattering pattern in the corresponding zone of described a plurality of electroluminescent lamps than with the density height of the described scattering pattern in the corresponding zone of described a plurality of electroluminescent lamps.
9, back light unit according to claim 1, wherein, described photocontrol partly comprises the combination of reflection graphic patterns or scattering pattern.
10, back light unit according to claim 7, wherein, described photocontrol partly has identical shaped dot pattern, at each piece of by the direction of intersecting along the longitudinal direction with described a plurality of electroluminescent lamps described substrate being divided in a plurality of that obtain, these dot patterns are formed on diverse location.
11, back light unit according to claim 1, wherein, the substrate of described diffusing panel is made by polymetylmethacrylate, polycarbonate, polystyrene PS or methyl methacrylate-styrene MS.
12, back light unit according to claim 1 wherein, forms the lens component of described diffusing panel with the shape of lens, prism, pyramid or bulge-structure.
13, back light unit according to claim 1 wherein, is arranged described lens component continuously along the longitudinal direction of described a plurality of electroluminescent lamps or with dot structure.
14, back light unit according to claim 1, wherein, described lens component is by making with described substrate identical materials.
15, back light unit according to claim 1, wherein, described lens component is made by the transmissivity material different with the transmissivity of the material of described substrate.
16, back light unit according to claim 2, wherein, described reflection graphic patterns is that 50% to 95% reflecting material is made by transmissivity.
17, back light unit according to claim 2, wherein, described reflection graphic patterns is by TiO 2, Al 2O 3, MgO, Ba or Ag make.
18, back light unit according to claim 1, this back light unit also comprises:
Reflecting plate, it is arranged on the top at the bottom of the described lid.
19, back light unit according to claim 1, wherein, described a plurality of electroluminescent lamps comprise: electroluminescent cell (EL), light emitting diode (LED), cold-cathode fluorescence lamp (CCFL), hot-cathode fluorescent lamp (HCFL) or external electrode fluorescent lamp (EEFL).
20, a kind of liquid crystal indicator, this liquid crystal indicator comprises:
Back light unit, this back light unit comprises: a plurality of electroluminescent lamps, it is arranged on and covers top, the end, so that described a plurality of electroluminescent lamp is with arranged at regular intervals; Diffusing panel, it is arranged on the top of described a plurality of electroluminescent lamps, and described diffusing panel comprises transparency carrier, it is corresponding and have the photocontrol part of reflection graphic patterns or scattering pattern and a plurality of lens components that are installed in the top of described substrate to be formed on the bottom of described substrate and described a plurality of electroluminescent lamp; And blooming, it is arranged on the top of described diffusing panel; And
Liquid crystal board, it is arranged on the top of described back light unit, described liquid crystal board comprises upper substrate connected to one another and infrabasal plate, and described upper substrate and described infrabasal plate each interval preset distance, so that filling liquid crystal in the space between described upper substrate and described infrabasal plate.
CNA200810088363XA 2007-03-30 2008-03-28 Backlight unit and liquid crystal display device having the same Pending CN101276098A (en)

Applications Claiming Priority (3)

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KR10-2007-0031598 2007-03-30
KR1020070031598A KR20080088821A (en) 2007-03-30 2007-03-30 Backlight unit and liquid crystal display device having the same
KR10-2007-0134015 2007-12-20

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102459996A (en) * 2009-06-30 2012-05-16 夏普株式会社 Lighting device, display apparatus, and television receiving equipment
US8794780B2 (en) 2009-01-23 2014-08-05 Sharp Kabushiki Kaisha Lighting device with light-scattering optical member
CN109725458A (en) * 2017-10-31 2019-05-07 乐金显示有限公司 Back light unit and liquid crystal display device including back light unit
CN109752882A (en) * 2017-11-08 2019-05-14 乐金显示有限公司 Back light unit and liquid crystal display device including back light unit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8794780B2 (en) 2009-01-23 2014-08-05 Sharp Kabushiki Kaisha Lighting device with light-scattering optical member
CN102459996A (en) * 2009-06-30 2012-05-16 夏普株式会社 Lighting device, display apparatus, and television receiving equipment
CN109725458A (en) * 2017-10-31 2019-05-07 乐金显示有限公司 Back light unit and liquid crystal display device including back light unit
US11029562B2 (en) 2017-10-31 2021-06-08 Lg Display Co., Ltd. Backlight unit and liquid crystal display device including the same
CN109725458B (en) * 2017-10-31 2021-09-14 乐金显示有限公司 Backlight unit and liquid crystal display device including the same
CN109752882A (en) * 2017-11-08 2019-05-14 乐金显示有限公司 Back light unit and liquid crystal display device including back light unit
CN109752882B (en) * 2017-11-08 2021-10-08 乐金显示有限公司 Backlight unit and liquid crystal display device including the same

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Open date: 20081001