CN100517021C - Backlight assembly and liquid crystal display device having the same - Google Patents

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

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Publication number
CN100517021C
CN100517021C CNB2006100809420A CN200610080942A CN100517021C CN 100517021 C CN100517021 C CN 100517021C CN B2006100809420 A CNB2006100809420 A CN B2006100809420A CN 200610080942 A CN200610080942 A CN 200610080942A CN 100517021 C CN100517021 C CN 100517021C
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China
Prior art keywords
light
guide plate
pearl
light guide
diffusion sheet
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CNB2006100809420A
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CN1869788A (en
Inventor
韩丙雄
周荣备
曹宗焕
金东哲
金珠贤
朴泳熹
金奎锡
李钟南
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Samsung Display Co Ltd
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Samsung Electronics Co Ltd
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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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof

Abstract

A backlight assembly includes a light source, a light-guiding plate and a diffusion sheet that includes a first bead layer on a lower surface of the diffusion sheet facing the light-guiding plate, and a second bead layer on an upper surface of the diffusion sheet. To improve image display quality, the hardness of the beads of the first bead layer facing the light guide plate are equal to or less than that of the light guide plate to prevent scratching of the light guide plate.

Description

Module backlight and have the liquid crystal indicator of this module backlight
Technical field
The present invention relates to a kind of module backlight and a kind of liquid crystal display (LCD) device, more particularly, relate to a kind of thinner module backlight with improved color reprodubility and image displaying quality with this module backlight.
Background technology
Because image display device, especially comparable cathode ray tube (CRT) of LCD (LCD) or plasma display (PDP) are thinner and have lower driving voltage and energy consumption, so they are expected in many electronic installations (for example mobile communication terminal, digital camera, portable computer, watch-dog etc.).The liquid crystal watch that is used among the LCD reveals anisotropic refraction and anisotropic specific inductive capacity.Because it is not luminous that LCD neither produces light yet, so LCD needs module backlight so that incident light to be provided.Traditional module backlight comprises cold-cathode fluorescence lamp (CCFL) or the light emitting diode (LED) as light source.CCFL has low manufacturing cost, high brightness, but the big driving voltage that also need be high of its size.The LCD that the small screen LCD for example is used in the mobile communication terminal need use LED, but LED provides pointolite.In order to be distributed to equably on the surface, need light guide plate and diffusion sheet from the light of pointolite.
The material that can be used for light guide plate comprises polymethylmethacrylate (PMMA) and polycarbonate (PC).PMMA has good optical feature, high rigidity and good plasticity, and PC has high thermotolerance.In order to make thinner the small screen LCD device, the thickness of light guide plate must reduce, and wherein, light guide plate is the thickest element of module backlight.Yet, the thermotolerance that reduces to have reduced it of light guide plate.In order to improve the thermotolerance of light guide plate, light guide plate comprises having high stable on heating PC.
The diffusion sheet that is used with light guide plate be included in diffusion sheet towards lip-deep pearl (bead) layer of light guide plate and on another surface of diffusion sheet with the bead layer of diffusion light.These D scores and " on " bead layer made by PMMA.The PMMA of the pearl in the following bead layer is harder than the PC that is used in the light guide plate.The pearl of diffusion sheet and the wearing and tearing between the light guide plate can cause scratch, and described scratch has reduced the image displaying quality of LCD device.
For producing white light, module backlight uses blue-ray LED, and this LED has disposed thereon yellow fluorescent material.Blue light and gold-tinted combination are to form white light.Yet blue light is preponderated in this layout, thereby has reduced the color reprodubility of LCD.
Summary of the invention
The light intensity that the invention provides a kind of scratch that prevents light guide plate and increase longer wavelength is to improve the module backlight of color reprodubility.Module backlight according to an aspect of the present invention comprises: light source; Light guide plate; Diffusion sheet has bead layer on each of two surfaces of this diffusion sheet.The pearl towards light guide plate of diffusion sheet has the hardness of the hardness of the light guide plate of being no more than, and can be by making with the material identical materials of light guide plate, for example polycarbonate.Light guide plate can have the hardness of the hardness that is equal to the B pencil, and the pearl of diffuser plate can have the hardness of the hardness that is not more than the B pencil and can comprise the nylon based resin.
According to a further aspect in the invention, light source can comprise that at least one produces the light emitting diode of white light, and diffusion sheet can comprise the coating towards the lip-deep red fluorescence agent of light guide plate that has at diffusion sheet.Alternatively, the facing surfaces of diffusion sheet also can be coated with the red fluorescence agent.The red fluorescence agent can comprise a plurality of pearls, and each pearl has spherical form basically, and should advantageously be not more than about 5 μ m on diameter.Light emitting diode can comprise blue chip and yellow fluorescence agent.Blue chip produces light blue coloured light.The yellow fluorescence agent becomes the part of light blue coloured light into little sodium yellow, makes little sodium yellow mix with the remainder of light blue coloured light to produce white light.The ground floor of diffusion sheet or the diameter of the pearl in the upper strata can be in from about 5 μ m to the range of size of about 20 μ m.The pearl that is coated on the second layer on the lower surface of diffusion sheet can be not more than about 5 μ m on diameter.
Description of drawings
By the reference accompanying drawing example embodiment of the present invention is described in detail, will become apparent above the present invention with other advantages, in the accompanying drawings:
Fig. 1 illustrates the decomposition diagram of module backlight according to an embodiment of the invention;
Fig. 2 is the cut-open view that the diffusion sheet shown in Fig. 1 is shown;
Fig. 3 is the cut-open view that the light emitting diode shown in Fig. 1 (LED) is shown;
Fig. 4 illustrates the cut-open view of diffusion sheet according to another embodiment of the present invention;
Fig. 5 is the curve map that the relation between wavelength and the radiance is shown;
Fig. 6 is the cut-open view that illustrates according to the diffusion sheet of further embodiment of this invention;
Fig. 7 is the decomposition diagram that liquid crystal display according to an embodiment of the invention (LCD) device is shown.
Embodiment
Describe the present invention hereinafter more fully with reference to accompanying drawing, embodiments of the invention are represented in the accompanying drawings.Yet the present invention can implement with many different forms, the embodiment that should not be interpreted as being confined to here and set forth.On the contrary, it is in order to make the disclosure detailed and complete that these embodiment are provided, and will pass on scope of the present invention to those skilled in the art fully.In the accompanying drawings, for the sake of clarity, can exaggerate the layer and the zone size and relative size.
Should be appreciated that, when element or layer relate to another element or layer " on ", in " being connected to " or " joining to " another element or when layer,, this element or layer can be directly on another element or layers, another element or layer are directly connected to or joined to, or insertion element or layer had.On the contrary, when element relate to " directly " another element or layer " on ", " being directly connected to " or " directly joining to " another element or when layer, do not have insertion element or layer.Identical label is represented components identical all the time.As here using, term " and/or " comprise one or more relevant any one of being listd and all combinations.Should be appreciated that though the term first, second, third, etc. can be used for describing various elements, assembly, zone, layer and/or part here, these elements, assembly, zone, layer and/or part should not limited by these terms.These terms only are used for an element, assembly, zone, layer or part are different from another zone, layer or part.Therefore, under the situation that does not break away from instruction of the present invention, the first following element, assembly, zone, layer or part can be known as second element, assembly, zone, layer or part.The space relative terms, for example " below ", " following ", " low ", " top ", " on " etc. can be used for an element as shown in the figures or feature convenience here to the description of the relation of another element or feature.Should be appreciated that the space relative terms is intended to comprise the device in the use outside the direction of describing in the accompanying drawing or the different direction of operation.For example, if the device in the accompanying drawing is reversed, with other elements or feature " below " or " below " element of describing will be oriented in subsequently other elements or feature " above ".Therefore, exemplary term " following " can comprise top and following both direction.Device can be by in addition directed (revolve turn 90 degrees or in the other direction), and correspondingly explain the relative descriptor in space that uses here.Here the term of Shi Yonging only is used to describe the purpose of specific embodiment, is not in order to limit invention.As here using, singulative " " and " that " are intended to also comprise the form of plural number, show unless context clearly has in addition.In addition, should be appreciated that, term " comprises ", when in instructions, using, specify the existence of feature, integral body, step, operation, element and/or the assembly of statement, but do not get rid of the existence or the interpolation of other one or more features, integral body, step, operation, element, assembly and/or their group.Here are schematically illustrating with reference to the described embodiments of the invention of cut-open view to desirable embodiment of the present invention (and intermediate structure).Similarly, also expectation shows the alteration of form that is caused by for example manufacturing technology and/or tolerance.Therefore, embodiments of the invention should not be interpreted as being confined to the given shape in zone shown here, and should be interpreted as comprising by for example making departing from of the shape that causes.For example, will typically have feature round or curve and/or in the gradient of the implantation concentration of injection region edge with the injection region shown in the rectangle, but not from the injection region to the variation of the binary of non-injection region.Similarly, can cause some injection in the zone between buried regions and the surface, wherein, inject via described surface and take place by injecting the buried regions that forms.Therefore, the zone shown in the accompanying drawing is that schematically their shape is not the true form for the zone that device is shown, and is not in order to limit scope of invention in essence.Unless otherwise defined, all terms (comprising technical term and scientific terminology) that here use have the meaning equivalent in meaning with those skilled in the art's common sense.Should also be appreciated that, term for example those terms that are defined in universaling dictionary should be interpreted as having the meaning with its aggregatio mentium in the context of correlation technique, should not be interpreted as the idealized or excessive formal meaning, unless clearly so defined herein.
Hereinafter, will describe the present invention in conjunction with the accompanying drawings.
Fig. 1 illustrates the decomposition diagram of module backlight according to an embodiment of the invention.Fig. 2 is the cut-open view that the diffusion sheet shown in Fig. 1 is shown.
See figures.1.and.2, module 100 backlight comprises: light source 200 is used to produce light; Light guide plate 300, the light that guiding produces from light source 200; Diffusion sheet 400 is on the light output surface 320 of light guide plate 300.The light incident surface 310 of light source 200 contiguous light guide plate 300.In Fig. 1 and Fig. 2, light source 200 comprises at least one light emitting diode (LED).Assembled at predetermined angular range from the light that LED produces, make a plurality of LED on the light incident surface 310 of light guide plate 300, to improve the brightness uniformity of module 100 backlight.Can change quantity and the lighting angle of LED 200 based on the size of light guide plate 300.Alternatively, light source 200 can comprise cold-cathode fluorescence lamp (CCFL).
Light guide plate 300 guiding become it into optical plane from the light that light source 200 produces, and wherein, light source 200 can be pointolite or line source.Light guide plate 300 comprises that transparent material is to increase the brightness of module 100 backlight.Light guide plate 300 should approach as much as possible to reduce the thickness of module 100 backlight.Light guide plate 300 should have high thermotolerance, make that it will be by the thermal deformation that produces from light source 200, and can make by having the stable on heating polycarbonate (PC) higher than the thermotolerance of polymethylmethacrylate (PMMA), usually, PMMA greater than about 84 ℃ to about 100 ℃ temperature deformations.The hardness of the PMMA hardness with the 3H pencil basically is identical.Usually, polycarbonate greater than about 121 ℃ to about 142 ℃ temperature deformations, the hardness of the PC hardness with the B pencil basically is identical.That is to say that PC has than higher thermotolerance of the thermotolerance of PMMA and the hardness lower than the hardness of PMMA.
Light guide plate 300 comprises: light incident surface 310, towards light source 200; Light output surface 320 extends from a side of light incident surface 310; Light reflective surface 330 is from the opposite side extension of light incident surface 310.Light reflective surface 330 is towards light output surface 320.The reflection graphic patterns (not shown) can be formed on the light reflective surface 330 of light guide plate 300, makes into the light that injects light guide plate 300 from scattering of reflection graphic patterns (not shown) and reflection.The example of reflection graphic patterns (not shown) comprises printed patterns and embossed pattern.The light of going into to inject light guide plate 300 is from scattering of reflection graphic patterns (not shown) and reflection.That is to say that the pattern (not shown) modulation that is reflected of the light of going into to inject light guide plate 300 has greater than light output surface 320 or light reflective surface 330 outgoing from light guide plate 300 of the part of the light modulated of the incident angle of predetermined critical angle.
Diffusion sheet 400 is on the light output surface 320 of light guide plate 300.Diffusion sheet 400 diffuses through the light of light output surface 320 from light guide plate 300 outgoing, to improve the brightness when observing in the plane and the brightness uniformity of light.With reference to Fig. 2, diffusion sheet 400 comprises basement membrane 410, first bead layer 420 and second bead layer 430.First basement membrane 410 comprises transparent material.The transparent material that can be used for first basement membrane 410 comprises polyethylene terephthalate (PET).First bead layer 420 basement membrane 410 on the lower surface of light guide plate 300.First bead layer 420 inserts between the basement membrane 410 and light guide plate 300 of diffusion sheet 400, makes diffusion sheet 400 not invest light guide plate 300.That is to say that diffusion sheet 400 separates with light guide plate 300 by first bead layer 420, and prevents Moire effect (moir é effect), and therefore can improve the image displaying quality of LCD device with module 100 backlight.First bead layer 420 comprises: a plurality of first pearls 422, and each pearl has spherical form basically; First coating 424 is used for first pearl 422 is fixed to basement membrane 410.First pearl 422 is distributed on the lower surface of basement membrane 410 randomly.
In Fig. 1 and Fig. 2, the size of each of first pearl 422 can be not more than about 10 μ m on diameter.The size of each of first pearl 422 can preferably about 3 μ m on diameter to about 7 μ m.First pearl 422 has the hardness lower than the hardness of light guide plate 300, to prevent the wearing and tearing scratch light guide plate 300 between first pearl 422 and the light guide plate 300.Alternatively, first pearl 422 can have identical with the hardness of light guide plate 300 basically hardness.In Fig. 1 and Fig. 2, light guide plate 300 can be made by the polycarbonate of the hardness with B pencil, and first pearl 422 has the hardness of the hardness that is not more than the B pencil.For example, first pearl 422 comprises the nylon based resin of the hardness with B pencil.Alternatively, first pearl 422 can have basically the material identical materials with light guide plate 300.That is to say that first pearl 422 can be made by the PC that is used for light guide plate 300.First coating 424 is fixed to basement membrane 410 with first pearl 422.For example, first coating 424 can comprise thermoset resin by heat curing or the UV-cured resin by ultraviolet light polymerization.
Table 1 illustrates the relation between the scratch degree of depth of the material of first bead layer 422 and light guide plate 300.
Table 1
Material The scratch degree of depth (μ m) White point
Nylon 0.05 X
Be coated with the PMMA of rubber 2.14 O
Uncoated PMMA 3.37 O
With reference to table 1, tested the abrasive formation that comprises the nylon based resin beads, is coated with first pearl 422 of the PMMA pearl of elastomeric material and uncoated PMMA pearl.Pearl 422 by the manufacturing of nylon based resin beads forms the scratch with degree of depth littler than the abrasive degree of depth that is formed by PMMA pearl that is coated with elastomeric material or uncoated PMMA pearl.When passing the light guide plate 300 that abrasive optical tests is scratched, do not form white point being comprised on first pearl, the 422 abrasive light guide plate 300 of nylon based resin.
When first pearl 422 on the lower surface of diffusion sheet 400 had the hardness of hardness of light guide plate of being not more than 300, less scratch was formed on the light guide plate 300 and forms less " white point ", thereby has improved the image displaying quality of LCD device.
Second bead layer 430 is formed on the upper surface of basement membrane 410.Second bead layer 430 diffuses through the light of diffusion sheet 400, and improves the brightness of module 100 backlight when observing in the plane.Second bead layer 430 comprises: a plurality of second pearls 432, and each pearl has spherical form basically; Second coating 434 is used for second pearl 432 is fixed to basement membrane 410.Second pearl 432 is distributed on the upper surface of basement membrane 410 randomly.The size of each of second pearl 432 can be that about 5 μ m are to about 20 μ m on diameter.Second pearl 432 has the density greater than the density of first pearl 422.
Second pearl 432 can be made by PMMA.Alternatively, second pearl 432 can comprise nylon based resin or PC.That is to say that second pearl 432 can be made by the material substantially the same with the material of first pearl 422.Second coating 434 is fixed to basement membrane 410 with second pearl 432.For example, second coating 434 can comprise thermoset resin by heat curing or the UV-cured resin by ultraviolet light polymerization.
Module 100 backlight also can be included in reflector plate 510 and the brightness enhancement film on the upper surface of diffusion sheet 400 520 on the light reflective surface 330 of light guide plate 300.The light that leaks from the light reflective surface 330 of light guide plate 300 from reflector plate 510 to light guide plate 300 reflections, to improve the brightness of module 100 backlight.Reflector plate 510 comprises high reflecting material.The example that can be used for the high reflecting material of reflector plate 510 comprises polyethylene terephthalate (PET) or polycarbonate (PC).Brightness enhancement film 520 guiding are passed the light of diffusion sheet to improve the brightness of light.Brightness enhancement film 520 can comprise that at least one prismatic lens is to increase the brightness when observing in the plane.In addition, brightness enhancement film 520 can comprise that also reflective polarizer films is to increase the brightness of module 100 backlight.
Fig. 3 is the cut-open view that the light emitting diode shown in Fig. 1 (LED) is shown.LED 200 comprises light-emitting component 210, for example is contained in the blue-ray LED of also fixing by mould parts 230 in the shell 220.Shell 220 has coniform shape, make light with wide angular range from shell 220 outgoing.Shell 220 can by insulating material for example polymkeric substance or pottery make, with protection light-emitting component 210.The reflection horizon (not shown) can be formed on the inside surface of shell 220, makes light reflect from the reflection horizon (not shown).Mould parts 230 are to be filled in the shell 220 to protect the transparent resin of light-emitting component 210, for example silicone resin, polycarbamate etc.
Mould parts 230 can comprise that the light that will produce from light-emitting component 210 becomes the fluorescer 240 of white light.For example, when light-emitting component 210 was blue-ray LED, fluorescer 240 comprised for example yttrium aluminum garnet (YAG) of yellow fluorescence agent, becomes gold-tinted with the part with light blue coloured light, and gold-tinted mixes with the remainder of light blue coloured light to produce white light.
Fig. 4 illustrates the cut-open view of diffusion sheet according to another embodiment of the present invention.Diffusion sheet 600 is on the light output surface 320 of light guide plate 300.Diffusion sheet 600 comprises basement membrane 610 and the red fluorescence agent 620 that is coated on the basement membrane 610.Basement membrane 610 comprises transparent material.For example, basement membrane 610 comprises polyethylene terephthalate (PET).Red fluorescence agent 620 is coated on the lower surface of basement membrane 610, and towards light guide plate 300.Red fluorescence agent 620 is fixed on the lower surface of basement membrane 610 by first coating 622.For example, first coating 622 comprises thermoset resin by heat curing or the UV-cured resin by ultraviolet light polymerization.
Red fluorescence agent 620 can comprise a plurality of pearls, and each pearl has spherical form basically.In Fig. 4, a plurality of red fluorescence agent 620 are dispersed on the basement membrane 610 randomly.The size of each of red fluorescence agent 620 pearls can be not more than 5 μ m on diameter.When diffusion sheet 600 comprised red fluorescence agent 620, the amount of light blue coloured light can reduce, and the amount of blush light can increase, and made the spectral range of the light that produces from module 100 backlight to be changed.
Fig. 5 is the curve map that the relation between wavelength and the radiance is shown.Radiance is represented the radiance of light.First curve G1 representative does not have the spectrum of the module backlight of red fluorescence agent 620, and the second curve G2 represents the spectrum of the module backlight of the diffusion sheet 600 with Fig. 4.
With reference to Fig. 1, Fig. 4 and Fig. 5, in the first curve G1, when module backlight did not comprise that red fluorescence agent 620 only comprises blue chip and yellow fluorescent material, the amount of light blue coloured light was greater than the amount of little sodium yellow, and the amount of little sodium yellow is greater than the amount of blush light.Yet in the second curve G2, when module backlight comprised the diffusion sheet 600 with red fluorescence agent 620, the amount of light blue coloured light can reduce, and the amount of blush light increases, and makes that the amount of light blue coloured light, little sodium yellow and blush light is substantially the same.Module backlight yet can comprise the yellow fluorescence agent.Therefore, improved the color reprodubility of liquid crystal indicator with the diffusion sheet 600 that comprises red fluorescence agent 620.In addition, though the thickness of light guide plate 300 can reduce, diffusion sheet 600 can not invest light guide plate 300.That is to say that diffusion sheet 600 separates preventing the Moire effect of LCD device by red fluorescence agent 620 and light guide plate 300, and therefore can improve the image displaying quality of LCD device.
First bead layer 630 can be formed on the upper surface of diffusion sheet 600.First bead layer 630 diffuses through the light of diffusion sheet 600, and increases the brightness of module 100 backlight when observing in the plane.First bead layer 630 comprises a plurality of first pearls 632 and first coating 634.First pearl 632 is distributed on the basement membrane 610 of diffusion sheet 600 randomly.The size of each of first pearl 632 can be about 5 μ m to about 20 μ m on diameter.First pearl 632 can comprise nylon based resin, PMMA etc.First pearl 632 is fixed on the upper surface of basement membrane 610 by first coating 634.For example, first coating 634 can comprise thermoset resin by heat curing or the UV-cured resin by ultraviolet light polymerization.
Fig. 6 is the cut-open view that illustrates according to the diffusion sheet of further embodiment of this invention.Diffusion sheet 650 comprises basement membrane 660 and the red fluorescence agent 690 that is coated on the basement membrane 660.Basement membrane 660 comprises transparent material.The example that can be used for the transparent material of basement membrane 660 comprises polyethylene terephthalate (PET), PMMA etc.In Fig. 6, basement membrane 660 comprises PET.Red fluorescence agent 690 is coated on the lower surface and upper surface of basement membrane 660.Red fluorescence agent 690 can comprise a plurality of pearls, and each pearl has spherical form basically.Diffusion sheet 650 can comprise a plurality of lower surface of basement membrane 660 and red fluorescence agent 690 pearls on the upper surface of being distributed in randomly.For example, the size of each of red fluorescence agent 690 pearls can be not more than about 5 μ m on diameter.When diffusion sheet 650 comprised red fluorescence agent 690, the amount of light blue coloured light can reduce, and the amount of blush light can increase, and made the spectral range of the light that produces from module 100 backlight to be changed.
First bead layer 670 can be formed on the upper surface of diffusion sheet 650.First bead layer 670 diffuses through the light of diffusion sheet 650, and increases the brightness of module 100 backlight when observing in the plane.First bead layer 670 comprises a plurality of first pearls 672 and first coating 674.First pearl 672 is distributed on the upper surface of basement membrane 660 randomly.The size of each of first pearl 672 can be about 5 μ m to about 20 μ m on diameter.First pearl 672 can comprise nylon based resin or PMMA.First pearl 672 is fixed to the upper surface of basement membrane 660 by first coating 674.For example, first coating 674 can comprise thermoset resin by heat curing or the UV-cured resin by ultraviolet light polymerization.Second bead layer 680 can be formed on the lower surface of diffusion sheet 650, makes diffusion sheet 650 not invest light guide plate 300.Second bead layer 680 comprises a plurality of second pearls 682 and second coating 684.Second pearl 682 is distributed on the lower surface of basement membrane 660 randomly.The size of each of second pearl 682 can be not more than 5 μ m on diameter.Second pearl 682 can comprise the nylon based resin.Second pearl 682 can be fixed to the lower surface of basement membrane 660 by second coating 684.For example, second coating 684 can comprise thermoset resin by heat curing or the UV-cured resin by ultraviolet light polymerization.Alternatively, red fluorescence agent 690 can only be formed on the upper surface of basement membrane 660.
Fig. 7 is the decomposition diagram that liquid crystal display according to an embodiment of the invention (LCD) device is shown.LCD device 700 comprises module 100 backlight and display unit 800.Module 100 backlight is to display unit 800 supply lights.Display unit 800 is based on the light display image that produces from module 100 backlight.The module backlight of Fig. 7 is substantially the same with the module backlight among Fig. 1 to Fig. 6.Therefore, identical reference number will be used in reference to and the same or analogous part of describing in Fig. 1 to Fig. 6 of part, and will omit any further explanation about above element.Display unit 800 comprises LCD panel 810, chip for driving 820 and flexible PCB 830.LCD panel 810 is based on the light display image that produces from module 100 backlight.Chip for driving 820 produces drive signal to drive LCD panel 810.Flexible PCB 830 is applied to LCD panel 810 with control signal.LCD panel 810 comprises first substrate 812, second substrate 814 and liquid crystal layer (not shown).Second substrate 814 is towards first substrate 812.The liquid crystal layer (not shown) inserts between first substrate 812 and second substrate 814.
First substrate 812 comprises a plurality of thin film transistor (TFT)s of arranging with matrix shape (TFT).For example, first substrate 812 comprises clear glass.The source electrode and the gate electrode of each of TFT are electrically connected to data line and gate line respectively.The drain electrode of each of TFT is electrically connected to the pixel electrode with transparent conductive material.Second substrate 814 is the color filter substrate with redness, green and blue pixel.For example, second substrate 814 comprises clear glass.Second substrate 814 also can comprise the common electrode with transparent conductive material.When electric energy was applied to the gate electrode of TFT, the TFT conducting made to form electric field between pixel electrode (not shown) and common electrode (not shown).The liquid crystal response that inserts in the liquid crystal layer between first substrate 812 and second substrate 814 changes orientation in the electric field that is applied to the there, and therefore its transmittance also can change with display image.Chip for driving 820 is formed in first substrate 812.Chip for driving 820 produces drive signal based on the control signal that comes from flexible PCB 830, to drive LCD panel 810.The drive signal that produces from chip for driving 820 is applied to the gate line and the data line of first substrate 812, to drive LCD panel 810.Flexible PCB 830 is electrically connected to the end sections of first substrate 812, and wherein, chip for driving 820 is installed on the end sections of first substrate.Flexible PCB 830 comprises time schedule controller, storer etc.Time schedule controller produces timing control signal applying with the controlling and driving signal.Data-signal is stored in the storer.For example, flexible PCB 830 can be electrically connected to first substrate 812 by anisotropic conductive film (ACF).
According to the present invention, the pearl that is formed on the lower surface of diffusion sheet has the hardness of the hardness that is less than or equal to diffusion sheet, thereby prevents the scratch between diffusion sheet and the light guide plate, to improve the image displaying quality of LCD device.In addition, diffusion sheet comprises the red fluorescence agent, thereby the amount of light blue coloured light can reduce, and the amount of blush light can increase.Therefore, although can improve the color reprodubility of LCD device, the brightness of LCD device does not reduce.
The present invention has been described with reference to exemplary embodiment.Yet, be apparent that many optionally to change and change for the technician in the field noted earlier will be tangible.Therefore, the present invention comprises all such optionally change and changes, as long as so optionally change and change in the spirit and scope that fall into claim.

Claims (19)

1, a kind of module backlight comprises:
Light source produces light;
Light guide plate, the light that guiding produces from described light source;
Diffusion sheet, on the light output surface of described light guide plate, described diffusion sheet comprises:
First bead layer, described diffusion sheet on the lower surface of described light guide plate, described first bead layer comprises a plurality of first pearls, described first pearl has the hardness of the hardness that is not more than described light guide plate;
Second bead layer is on the upper surface of described diffusion sheet.
2, module backlight as claimed in claim 1, wherein, described first pearl comprises the material identical materials with described light guide plate.
3, module backlight as claimed in claim 1, wherein, described light guide plate comprises polycarbonate.
4, module backlight as claimed in claim 3, wherein, described light guide plate has the hardness that equates with the hardness of B pencil.
5, module backlight as claimed in claim 4, wherein, described first pearl has the hardness of the hardness that is not more than the B pencil.
6, module backlight as claimed in claim 3, wherein, described first pearl comprises the nylon based resin.
7, module backlight as claimed in claim 3, wherein, described first pearl comprises polycarbonate.
8, module backlight as claimed in claim 1, wherein, the size of each of described first pearl is not more than 10 μ m on diameter.
9, module backlight as claimed in claim 1 also comprises first coating, so that described first pearl is fixed to described diffusion sheet.
10, module backlight as claimed in claim 1, wherein, described second bead layer comprises:
A plurality of second pearls;
Second coating is to be fixed to described diffusion sheet with described second pearl.
11, module backlight as claimed in claim 10, wherein, described second pearl comprises polymethylmethacrylate.
12, module backlight as claimed in claim 10, wherein, described second pearl comprises the nylon based resin.
13, module backlight as claimed in claim 10, wherein, the size of each of described second pearl is 5 μ m to 20 μ m on diameter.
14, module backlight as claimed in claim 1, wherein, described light source comprises that at least one produces the light emitting diode of white light.
15, module backlight as claimed in claim 1 also comprises:
Reflector plate is on the light reflective surface of described light guide plate;
Brightness enhancement film is on described diffusion sheet.
16, a kind of liquid crystal indicator comprises:
Module backlight comprises:
Light source produces light;
Light guide plate, the light that guiding produces from described light source;
Diffusion sheet, on the light output surface of described light guide plate, described diffusion sheet comprises:
First bead layer, described diffusion sheet on the lower surface of described light guide plate, described first bead layer comprises a plurality of first pearls, described first pearl has the hardness of the hardness that is not more than described light guide plate;
Second bead layer is on the upper surface of described diffusion sheet;
Display panels is based on the light display image that produces from described module backlight.
17, liquid crystal indicator as claimed in claim 16, wherein, described light guide plate comprises polycarbonate, described polycarbonate has the hardness identical with the hardness of B pencil.
18, liquid crystal indicator as claimed in claim 17, wherein, described first pearl has the hardness of the hardness that is not more than the B pencil.
19, liquid crystal indicator as claimed in claim 17, wherein, described first pearl comprises the nylon based resin.
CNB2006100809420A 2005-05-25 2006-05-23 Backlight assembly and liquid crystal display device having the same Active CN100517021C (en)

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