CN101592747B - Optical sheet, backlight unit, and liquid crystal display - Google Patents
Optical sheet, backlight unit, and liquid crystal display Download PDFInfo
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- CN101592747B CN101592747B CN2008101879082A CN200810187908A CN101592747B CN 101592747 B CN101592747 B CN 101592747B CN 2008101879082 A CN2008101879082 A CN 2008101879082A CN 200810187908 A CN200810187908 A CN 200810187908A CN 101592747 B CN101592747 B CN 101592747B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
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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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/30—Fillers, e.g. particles, powders, beads, flakes, spheres, chips
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/42—Polarizing, birefringent, filtering
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Nonlinear Science (AREA)
- Dispersion Chemistry (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
An optical sheet, a backlight unit including the optical sheet, and a liquid crystal display including the backlight unit are disclosed. The optical sheet includes a reflective polarizing film, and a first diffusing layer on the reflective polarizing film. The first diffusing layer includes a plurality of first diffusion particles. The first diffusion particles have a volume distribution as a function of diameter. For a diameter D of a first diffusion particle corresponding to a maximum value of the volume distribution, a summation of volumes of a portion of the first diffusion particles having diameters between D-2 microns and D+2 microns is about 40 % to 80 % of a total volume of the first diffusion particles.
Description
Technical field
The present invention relates to a kind of optical sheet; The back light unit and the LCD that comprises this back light unit that comprise this optical sheet; All these devices all are used in such as TV, computing machine, personal digital assistant; The display device that mobile phone is such is in the such vehicles of navigation elements (like automobile or aircraft) terminal or other devices.
Background technology
Recently, can visually show the various displays fast developments of various electrical signal information.The various flat-panel monitors that have such as slim body, the in light weight and good characteristic that low-power consumption is so have been produced.Therefore, along with consumer and the selection of industry to device, cathode ray tube (CRT) is replaced by flat-panel monitor just fast.
General flat-panel monitor for example comprises LCD (LCD), plasma display (PDP), Field Emission Display (FED) and electroluminescent display (ELD).Because higher contrast ratio and static and outstanding display characteristic moving image can be provided, conventional LCD quilt is extensively as the display panel of notebook, monitor, TV and other monitors of personal computer.
The display panels that LCD comprises display image be positioned at below the display panels back light unit that light is provided for display panels.
Back light unit comprises light source and optical sheet.Optical sheet generally comprises diffusion sheet, prismatic lens or screening glass.
Reduce if offered the brightness uniformity of the light of display panels by back light unit, then the display quality of LCD will descend.In the prior art, conventional diffusion sheet is uniformly dispersed on the whole surface of viewing area of display panels light, thereby the brightness uniformity that prevents light reduces.Yet, only use conventional diffusion sheet to be difficult to guarantee higher optics diffusivity and brightness uniformity.
Summary of the invention
Exemplary embodiments of the present invention provides a kind of optical sheet that can improve the light diffuser efficiency, comprise the back light unit of this optical sheet and comprise the LCD of this back light unit.
With listing other feature and advantage of exemplary embodiments of the present invention in the following description, and wherein a part will become obviously according to said description, perhaps be appreciated that through practice of the present invention.Can realize and obtain the purpose of exemplary embodiments of the present invention and other advantage through the structure that in the instructions of writing and claim and accompanying drawing, particularly points out.
In one aspect; A kind of optical sheet is provided; It comprises reflection polarizing film and first diffusion layer on said reflection polarizing film, and said first diffusion layer comprises a plurality of first diffusion particles, wherein when the diameter that in the volume of said first diffusion particle, has peaked said first diffusion particle is D μ m; The volume summation of said first diffusion particle of diameter between D-2 μ m and D+2 μ m is 40% to 80% of the said first diffusion particle cumulative volume, and wherein D is 3 μ m to 6 μ m.
In one aspect of the method; A kind of back light unit is provided; It comprises light source and the optical sheet on said light source; Said optical sheet comprises reflection polarizing film and first diffusion layer on said reflection polarizing film, and said first diffusion layer comprises a plurality of first diffusion particles, wherein when the diameter that in the volume of said first diffusion particle, has peaked said first diffusion particle is D μ m; The volume summation of said first diffusion particle of diameter between D-2 μ m and D+2 μ m is 40% to 80% of the said first diffusion particle cumulative volume, and wherein D is 3 μ m to 6 μ m.
In one aspect of the method; A kind of LCD is provided; It comprises light source, at optical sheet on the said light source and the display panels on said optical sheet; Said optical sheet comprises reflection polarizing film and first diffusion layer on said reflection polarizing film, and said first diffusion layer comprises a plurality of first diffusion particles, wherein when the diameter that in the volume of said first diffusion particle, has peaked said first diffusion particle is D μ m; The volume summation of said first diffusion particle of diameter between D-2 μ m and D+2 μ m is 40% to 80% of the said first diffusion particle cumulative volume, and wherein D is 3 μ m to 6 μ m.
In one aspect of the method; A kind of optical sheet is provided; It comprises reflection polarizing film and first diffusion layer on said reflection polarizing film, and said first diffusion layer comprises a plurality of first diffusion particles, and wherein each said first diffusion particle all has a diameter; Each said first diffusion particle with this diameter has a volume; Wherein when the diameter that in the volume of said first diffusion particle, has peaked said first diffusion particle was D μ m, the volume summation of said first diffusion particle of diameter between D-2 μ m and D+2 μ m was 40% to 80% of the said first diffusion particle cumulative volume, and wherein D is 3 μ m to 6 μ m.
The generality that should be appreciated that the front describe and following detailed all be typicalness with indicative, be intended to provide the embodiment of the invention of being asked for protection further to explain.
Description of drawings
Embodiments of the invention are provided the accompanying drawing diagram further understanding of the present invention and that formed an instructions part and have been used to explain principle of the present invention with instructions.
In the accompanying drawings:
Fig. 1 is the cross-sectional view of the optical sheet of an exemplary embodiments according to the present invention;
Fig. 2 is diameter and the curve of the relation between the volume distributed median of all first diffusion particles of diagram first diffusion layer;
Fig. 3 is the cross-sectional view of the optical sheet of another exemplary embodiments according to the present invention;
Fig. 4 is the cross-sectional view of the optical sheet of another exemplary embodiments according to the present invention;
Fig. 5 to 7 has shown according to the present invention the back light unit of an exemplary embodiments;
Fig. 8 to 10 has shown according to the present invention the back light unit of another exemplary embodiments;
Figure 11 to 13 has shown according to the present invention the LCD of an exemplary embodiments.
Embodiment
To be described in detail with reference to embodiments of the invention now, in the accompanying drawing diagram example.
In first embodiment; A kind of optical sheet is provided; It comprises reflection polarizing film and first diffusion layer on said reflection polarizing film; Said first diffusion layer comprises a plurality of first diffusion particles, and wherein when the diameter that in the volume of said first diffusion particle, has peaked said first diffusion particle was D μ m, then the volume summation of said first diffusion particle of diameter between D-2 μ m and D+2 μ m was 40% to 80% of said first diffusion particle.In other words, said first diffusion layer has predetermined volume, and 40% to 80% of this volume is made up of the diffusion particle of diameter between D-2 μ m and D+2 μ m.This measurement standard is called percent by volume.
The minimum diameter of said first diffusion particle can be 0.5 μ m.
The maximum gauge of said first diffusion particle can be 10 μ m.
D can be approximately 3 μ m to 6 μ m.
Each said first diffusion particle can be a kind of in bubble and the globule.
Said first diffusion particle is formed by the material of from the group of being made up of polymethylmethacrylate (PMMA), polystyrene, silicon and their compound, selecting.
Said optical sheet can further be included in first tack coat between said reflection polarizing film and said first diffusion layer.
Said optical sheet can further be included in second diffusion layer below the said reflection polarizing film.
Said optical sheet can further be included in second tack coat between said reflection polarizing film and said second diffusion layer.
Said second diffusion layer comprises a plurality of second diffusion particles.
Said reflection polarizing film comprises alternately laminated and has the ground floor and the second layer of different refractivity.
In another embodiment; A kind of back light unit is provided; It comprises light source and the optical sheet on said light source; Said optical sheet comprises reflection polarizing film and first diffusion layer on said reflection polarizing film; Said first diffusion layer comprises a plurality of first diffusion particles, and wherein when the diameter that in the volume of said first diffusion particle, has peaked said first diffusion particle was D μ m, then having first diffusion particle the percent by volume in said first diffusion layer of diameter between D-2 μ m and D+2 μ m was 40% to 80%.
In another embodiment; A kind of LCD is provided; It comprises light source, at optical sheet on the said light source and the display panels on said optical sheet; Said optical sheet comprises reflection polarizing film and first diffusion layer on said reflection polarizing film; Said first diffusion layer comprises a plurality of first diffusion particles, and wherein when the diameter that in the volume of said first diffusion particle, has peaked said first diffusion particle was D μ m, then having first diffusion particle the percent by volume in said first diffusion layer of diameter between D-2 μ m and D+2 μ m was 40% to 80%.
In another embodiment; A kind of optical sheet is provided; It comprises reflection polarizing film and first diffusion layer on said reflection polarizing film; Said first diffusion layer comprises a plurality of first diffusion particles, and wherein each said first diffusion particle all has a diameter, and each said first diffusion particle with this diameter has a volume; Wherein when the diameter that in the volume of said first diffusion particle, has peaked said first diffusion particle was D μ m, then having first diffusion particle the percent by volume in said first diffusion layer of diameter between D-2 μ m and D+2 μ m was 40% to 80%.
Afterwards, will describe exemplary embodiments of the present invention in detail with reference to accompanying drawing.
Fig. 1 is the cross-sectional view of the optical sheet 100 of the exemplary embodiments according to the present invention.
As shown in fig. 1, optical sheet 100 can comprise reflection polarizing film 110 and first diffusion layer 120 on said reflection polarizing film 110.Said first diffusion layer 120 can comprise a plurality of first diffusion particles 122.
Said reflection polarizing film 110 transmissives or reflect light from light source.Said reflection polarizing film 110 comprise the ground floor 111 that forms by polymkeric substance and with the second layer 112 of ground floor 111 adjacent settings.The said second layer 112 can be formed by the polymkeric substance with refractive index different with the refractive index of the polymkeric substance that forms said ground floor 111.
Said reflection polarizing film 110 has wherein said ground floor 111 and repeats alternately laminated structure with the said second layer 112.Said ground floor 111 can be formed by polymethylmethacrylate (PMMA), and the said second layer 112 can be formed by polyester.
In miniscope spare, said reflection polarizing film 110 can have the thickness of 100 μ m to 300 μ m.In giant display spare, said reflection polarizing film 110 can have the thickness of 700 μ m to 800 μ m.
By said reflection polarizing film 110 transmissions, be reflected to the light source below the said reflection polarizing film 110 from a part of light of light source from another part light of light source.The light that is reflected to light source is reflected once more, and incides on the said reflection polarizing film 110.Incide a part of light on the said reflection polarizing film 110 by said reflection polarizing film 110 transmissions, incide another part light on the said reflection polarizing film 110 and be reflected to the light source below the said reflection polarizing film 110 once more.
In other words; Because said reflection polarizing film 110 has the alternately laminated structure of polyester layer that wherein has different refractivity; So said reflection polarizing film 110 can use principle to improve the efficient from the light of light source; The molecule that is polymkeric substance is orientated in one direction, thereby sees through the polarization of the direction different with the direction of orientation of said molecule, and the polarization of the reflection direction identical with the direction of orientation of said molecule.
Said first diffusion layer 120 can diffuse through the light of said reflection polarizing film 110 through said first diffusion particle 122 in said first diffusion layer 120.
Said first diffusion layer 120 can comprise the resin 121 with predetermined bonding characteristic.Said resin 121 can use unsaturated polyester (UP), methyl methacrylate, Jia Jibingxisuanyizhi, isobutyl methacrylate, n-BMA, n-butyl methyl methyl acrylate, acrylic acid, methacrylic, methacrylic acid hydroxyethyl ester, hydroxypropyl methacrylate, hydroxyethyl acrylate, acrylic amide, NMA, glycidyl methacrylate, acrylic acid ethyl fat, acrylic acid isobutyl, acrylic acid n-butyl ester, such as 2-ethylhexyl acrylate polymkeric substance, 2-second ethylhexyl acrylate multipolymer or 2-second ethylhexyl acrylate terpolymer such based on acrylic acid material, polyurethane-based material, based on the material of epoxy resin, based on the material of melamine, but be not limited to this.
Each said first diffusion particle 122 in said first diffusion layer 120 can be first globule.Each said first diffusion particle 122 can be formed by the material of from the group of being made up of polymethylmethacrylate (PMMA), polystyrene, silicon and their compound, selecting.
Based on the resin 121 of 100 weight portions, said first diffusion layer 120 can comprise first diffusion particle 122 of 10 to 50 weight portions.When resin 121, when the amount of said first diffusion particle 122 is equal to or greater than 10 weight portions, use said globule to be easy to spread light from light source based on 100 weight portions.When resin 121, when the amount of said first diffusion particle 122 is equal to or less than 50 weight portions, can not reduce optical transmission rate from light source based on 100 weight portions.
The diameter that is distributed in said first diffusion particle 122 in the said resin 121 can be heterogeneous.
Said first diffusion particle 122 can have circle, avette, avette/circular and circle heterogeneous of merging, but is not limited to this.
Said first diffusion particle 122 can anisotropically be distributed in the said resin 121.
The diameter of said first diffusion particle 122 can be roughly 0.5 μ m to 10 μ m.When the diameter of said first diffusion particle 122 hour, can improve the optics diffusivity of said optical sheet 100 through the density that increases said first diffusion particle 122 in said first diffusion layer 120.Yet, when the diameter of said first diffusion particle 122 very hour, the interference of light from external light source can take place.Therefore, when the diameter of said first diffusion particle 122 is equal to or greater than 0.5 μ m, can the optics diffusivity maximum of said optical sheet 100 be increased to the degree that the interference of light does not take place.
When the diameter of said first diffusion particle 122 was big, said first diffusion layer 120 must form than heavy back, guaranteeing the optics diffusivity of said optical sheet 100, thereby was difficult to make the thin optical sheet 100 of profile.Therefore, when the diameter of said first diffusion particle 122 is equal to or less than 10 μ m, can the thin profile of said optical sheet 100 be formed up to the degree of the optics diffusivity that does not reduce optical sheet 100.
When the diameter of said first diffusion particle 122 with ideal maximum value was D μ m, having first diffusion particle the percent by volume in said first diffusion layer of diameter between D-2 μ m and D+2 μ m was 40% to 80%.This measurement standard is called percent by volume.
With reference to the diameter of all first diffusion particles 122 of said first diffusion layer 120 of the curve description of Fig. 2 and the relation between the percent by volume.In the curve of Fig. 2, horizontal ordinate representes with μ m to be the diameter of first diffusion particle 122 of unit, and ordinate is represented the percent by volume of each diameter based on the cumulative volume of first diffusion particle 122.Equally, percent by volume is the percent by volume of diffusion layer that comprises the particle of special diameter.
As shown in Figure 2; For the diameter D of said first diffusion particle corresponding with said maximum desired value in the volume of said first diffusion particle 122, having first diffusion particle the percent by volume in said first diffusion layer of diameter between D-2 μ m and D+2 μ m is 40% to 80%.The minimum diameter of said first diffusion particle 122 can be 0.5 μ m, and the maximum gauge of said first diffusion particle can be 10 μ m.D is roughly 4 μ m to 6 μ m.
Percent by volume with said first diffusion particle 122 of diameter D μ m can be about 30%.Percent by volume with said first diffusion particle 122 of diameter D-2 μ m can be about 10%.Amount with said first diffusion particle 122 of diameter D+2 μ m can be about 10%.
For example, for the diameter 5 μ m (being D=5) of first diffusion particle, the percent by volume of said first diffusion particle 122 of diameter between 3 μ m and 7 μ m be approximately 100% 40% to 80%.Perhaps, for the diameter 3 μ m (being D=3) of first diffusion particle, the percent by volume of said first diffusion particle 122 of diameter between 1 μ m and 5 μ m be approximately 100% 40% to 80%.
Following table 1 expression diameter Distribution is to the diffusion of said optical sheet 100 and the influence of brightness.In table 1, when D was 5 μ m, said first diffusion particle 122 had the diameter between 3 μ m and 7 μ m.Symbol *, zero with ◎ characteristic bad, good and outstanding state respectively.
[table 1]
Described in top table 1, when the accumulation (accumulation) be approximately said first diffusion particle, 122 cumulative volumes 40% to 80% the time, diffusion effect and brightness all are good or outstanding.This is because when accumulation is equal to or greater than 40%, can improve the diffusion effect that incides the light on the said optical sheet 100.In addition,, accumulation can prevent that brightness from descending when being equal to or less than 80%.
Thereby, when diameter when the percent by volume of said first diffusion particle 122 between D-2 μ m and the D+2 μ m is approximately 40% to 80%, can improve whole diffusion effect from the light of light source.
The back light unit that comprises the said optical sheet of this exemplary embodiments according to the present invention is operated as follows.
The light that is produced by light source incides on the said optical sheet.Incide said first diffusion particle collision of a part of light and said first diffusion layer on the said optical sheet, the travel path of light changes.Another part light that incides on the said optical sheet passes the emitting surface of said first diffusion layer, thereby propagates towards display panels.
With the light of said first diffusion particle collision and other first diffusion particles collisions near said first diffusion particle, the travel path of light changes repeatedly, and a part of light passes the emitting surface of said first diffusion layer and propagates towards said display panels.
After some collisions on some paths, the light that passes the emitting surface of said first diffusion layer evenly incides on the said display panels.
As stated, because the light that incides on the said optical sheet has been reflected several times by said first diffusion particle in said first diffusion layer, so spread in the same time that the travel path of light changes.Therefore, can improve brightness uniformity.
Fig. 3 is the cross-sectional view of the optical sheet 200 of another exemplary embodiments according to the present invention.
As shown in Figure 3, said optical sheet 200 can comprise reflection polarizing film 210 and first diffusion layer 210 on said reflection polarizing film 210.Said first diffusion layer 210 can comprise a plurality of first diffusion particles 222.
Said optical sheet 200 can further be included in first tack coat 230 between said reflection polarizing film 210 and said first diffusion layer 220.
Can be through resin 221 being mixed with said first diffusion particle 222 and potpourri being applied or is coated on the said reflection polarizing film 210 and on said reflection polarizing film 210, forms said first diffusion layer 220.
In addition; Can form said resin 221 and said first diffusion particle 222 with the form of film through using extrusion process or injection molding method; Use cementing agent that it is sticked on the said reflection polarizing film 210 then, thereby on said reflection polarizing film 210, form said first diffusion layer 220.In other words, can on said reflection polarizing film 210, apply first tack coat 230, thereby form said first diffusion layer 210.
Consider transmittance and bonding characteristic, the thickness of said first tack coat 230 can be roughly 1 μ m to 10 μ m, but is not limited to this.
Said reflection polarizing film 210 transmissives or reflect light from light source.Said reflection polarizing film 210 can comprise the ground floor 211 that forms by polymkeric substance and with the second layer 212 of ground floor 211 adjacent settings.The said second layer 212 can be formed by the polymkeric substance with refractive index different with the refractive index of the polymkeric substance that forms said ground floor 211.Because described said reflection polarizing film 210 with reference to Fig. 1 in the above, so will briefly carry out or the descriptions thereof are omitted.
Said first diffusion layer 220 can diffuse through the light of said reflection polarizing film 210 through said first diffusion particle 222 in said first diffusion layer 220.
Said first diffusion layer 220 can comprise the resin 221 with predetermined bonding characteristic.
Each said first diffusion particle 222 in said first diffusion layer 220 can be first globule.Each said first diffusion particle 222 can be formed by the material of from the group of being made up of polymethylmethacrylate (PMMA), polystyrene, silicon and their compound, selecting.
Based on the resin 221 of 100 weight portions, said first diffusion layer 220 can comprise first diffusion particle 222 of 10 to 50 weight portions.When resin 221, when the amount of said first diffusion particle 222 is equal to or greater than 10 weight portions, use said globule can be easy to spread light from light source based on 100 weight portions.When resin 221, when the amount of said first diffusion particle 222 is equal to or less than 50 weight portions, can not reduce optical transmission rate from light source based on 100 weight portions.
The diameter of said first diffusion particle 222 can be roughly 0.5 μ m to 10 μ m.When the diameter of said first diffusion particle 222 hour, can improve the optics diffusivity of said optical sheet 200 through the density that increases said first diffusion particle 222 in said first diffusion layer 220.Yet, when the diameter of said first diffusion particle 222 very hour, the interference of light from external light source may take place.Therefore, when the diameter of said first diffusion particle 222 is equal to or greater than 0.5 μ m, can the optics diffusivity maximum of said optical sheet 200 be increased to the degree that the interference of light does not take place.
When the diameter of said first diffusion particle 222 was big, said first diffusion layer 220 must form than heavy back, guaranteeing the optics diffusivity of said optical sheet 200, thereby was difficult to make the thin optical sheet 200 of profile.Therefore, when the diameter of said first diffusion particle 222 is equal to or less than 10 μ m, can the thin profile of said optical sheet 200 be formed up to the degree of the optics diffusivity that does not reduce optical sheet 200.
Said first diffusion particle 222 can have the distribution as the function of diameter.For first diffusion particle of diameter D, the percent by volume of said first diffusion particle 222 of diameter between D-2 μ m and D+2 μ m can be approximately 40% to 80%.
As stated, because the light that incides on the said optical sheet has been reflected several times by said first diffusion particle in said first diffusion layer, so spread in the same time that the travel path of light changes.Therefore, can improve brightness uniformity.
Fig. 4 is the cross-sectional view of the optical sheet 300 of another exemplary embodiments according to the present invention.
As shown in Figure 4, said optical sheet 300 can comprise reflection polarizing film 310, at first tack coat 330 on the said reflection polarizing film 310 and first diffusion layer 320 on said first tack coat 330.Said first diffusion layer 320 can comprise a plurality of first diffusion particles 322.
Said optical sheet 300 can further be included in second tack coat 340 and second diffusion layer 350 on said second tack coat 340 below the said reflection polarizing film 310.
Because described the structure of reflection polarizing film 310, first tack coat 330 and first diffusion layer 320 above, so the descriptions thereof are omitted.
Being used for that said reflection polarizing film 310 is adhered to said second tack coat 340 of said second diffusion layer 350 can be identical with said first tack coat 330.
Said second diffusion layer 350 can be identical with said first diffusion layer 320.Said second diffusion layer 350 can be through the light of a plurality of second diffusion particle 352 diffusions in said second diffusion layer 350 from external light source.
Said second diffusion layer 3500 comprises the resin 351 with predetermined bonding characteristic.Said resin 351 can use unsaturated polyester (UP), methyl methacrylate, Jia Jibingxisuanyizhi, isobutyl methacrylate, n-BMA, n-butyl methyl methyl acrylate, acrylic acid, methacrylic, methacrylic acid hydroxyethyl ester, hydroxypropyl methacrylate, hydroxyethyl acrylate, acrylic amide, NMA, methyl propenoic acid glycidyl base ester, acrylic acid ethyl ester, acrylic acid isobutyl, acrylic acid n-butyl ester, such as 2-ethylhexyl acrylate polymkeric substance, 2-second ethylhexyl acrylate multipolymer or 2-second ethylhexyl acrylate terpolymer such based on acrylic acid material, polyurethane-based material, based on the material of epoxy resin, based on the material of melamine, but be not limited to this.
Each said second diffusion particle 352 in said second diffusion layer 350 can be a globule.Each said second diffusion particle 352 can be formed by the material of from the group of being made up of polymethylmethacrylate (PMMA), polystyrene, silicon and their compound, selecting.
Based on the resin 351 of 100 weight portions, said second diffusion layer 350 comprises second diffusion particle 352 of 10 to 50 weight portions.When resin 351, when the amount of said second diffusion particle 352 is equal to or greater than 10 weight portions, use said globule can be easy to spread light from light source based on 100 weight portions.When resin 351, when the amount of said second diffusion particle 352 is equal to or less than 50 weight portions, can not reduce optical transmission rate from light source based on 100 weight portions.
The diameter that is distributed in said second diffusion particle 352 in the said resin 351 can be heterogeneous.
Said second diffusion particle 352 can have circle, avette, avette/circular and circle heterogeneous of merging, but is not limited to this.
Said second diffusion particle 352 can anisotropically be distributed in the said resin 351.
The diameter of said second diffusion particle 352 can be roughly 0.5 μ m to 10 μ m.When the diameter of said second diffusion particle 352 hour, can improve the optics diffusivity of said optical sheet 300 through the density that increases said second diffusion particle 352 in said second diffusion layer 350.Yet, when the diameter of said second diffusion particle 352 very hour, the interference of light from external light source may take place.Therefore, when the diameter of said second diffusion particle 352 is equal to or greater than 0.5 μ m, can the optics diffusivity maximum of said optical sheet 300 be increased to the degree that the interference of light does not take place.
When the diameter of said second diffusion particle 352 was big, said second diffusion layer 320 must form than heavy back, guaranteeing the optics diffusivity of said optical sheet 300, thereby was difficult to make the thin optical sheet 300 of profile.Therefore, when the diameter of said second diffusion particle 352 is equal to or less than 10 μ m, can the thin profile of said optical sheet 300 be formed up to the degree of the optics diffusivity that does not reduce optical sheet 300.
The same with said first diffusion particle 322, said second diffusion particle 352 can have the distribution as the diameter function.For second diffusion particle of diameter D, having said second diffusion particle the percent by volume in said second diffusion layer of diameter between D-2 μ m and D+2 μ m is 40% to 80%.
When the percent by volume of said second diffusion particle 352 of diameter between D-2 μ m and D+2 μ m is equal to or greater than 40%, can improve the diffusion effect that incides the light on the said optical sheet 300.
When the percent by volume of said second diffusion particle 352 of diameter between D-2 μ m and D+2 μ m is equal to or less than 80%, can prevent that brightness from descending.
Therefore, when diameter when the percent by volume of said second diffusion particle 352 between D-2 μ m and the D+2 μ m is approximately 40% to 80%, can improve diffusion effect from the light of light source.
Fig. 5 to 7 is decomposition diagram and cross-sectional views of structure of the back light unit that comprises optical sheet 400 of diagram exemplary embodiments according to the present invention.
Fig. 5 to 7 has shown edge light type backlight unit.Yet, in other embodiments, can use the back light unit of other types.Because the structure of the optical sheet shown in Fig. 5 to the 7 roughly said optical sheet with this exemplary embodiments according to the present invention is identical, so briefly carry out or the descriptions thereof are omitted fully.
Shown in Fig. 5 to 7, said back light unit 400 can be included in the LCD and light is provided for the display panels that comprises in the LCD.
Said back light unit 400 can comprise light source 420 and optical sheet 430.Said back light unit 400 further comprises LGP 440, reverberator 450, bottom 460 and mold frame 470.
Said light source 420 can use the driving electric that receives from the outside to produce light and launch the light of said generation.
Can to a side place at least one light source 420 be set at LGP 440 along the long axis direction of said LGP 440.Can at least one light source 420 all be set at each side place of said LGP 440 both sides.Light from said light source 420 can be directly incident on the said LGP 440.Perhaps, can incide then on the said LGP 440 from surrounding light source framework 422 reflections of a part of said light source 420 (for example surrounding the external peripheral surface of about 3/4 light source 420) from the light of said light source 420.
Said light source 420 can be a kind of in cold-cathode fluorescence lamp (CCFL), hot-cathode fluorescent lamp (HCFL), external-electrode fluorescent lamp (EEFL) and the light emitting diode (LED), but is not limited to this.
Said optical sheet 430 can be positioned on the said LGP 440.
As shown in Figure 5, said optical sheet 430 can comprise reflection polarizing film 430a and the first diffusion layer 430b on said reflection polarizing film 430a.The said first diffusion layer 430b can comprise a plurality of first diffusion particles.Said first diffusion particle has the volume distributed median as the diameter function.For the diameter D of first diffusion particle corresponding with the maximal value of volume distributed median, the volume summation of a part of said first diffusion particle of diameter between D-2 μ m and D+2 μ m can be approximately 40% to 80% of the said first diffusion particle cumulative volume.
As shown in Figure 6, said optical sheet 430 can further be included in the second diffusion layer 430c below the said reflection polarizing film 430a, and the said second diffusion layer 430c comprises a plurality of second diffusion particles.Said second diffusion particle can have the volume distributed median as the diameter function.For the diameter D of second diffusion particle corresponding with the maximal value of volume distributed median, the percent by volume of said second diffusion particle of diameter between D-2 μ m and D+2 μ m is 40% to 80%.
Can be in said optical sheet 430, said reflection polarizing film 430a can improve the efficient of light, and said first and second diffusion layer 430b and 430c can improve the diffusion effect of light.Therefore, can improve the brightness uniformity of light.As a result, can improve the display quality of said back light unit 400.
Between said LGP 440 and said optical sheet 430, be provided with at least one in prismatic lens 431 and the diffusion sheet 432.Said prismatic lens 431 or said diffusion sheet 432 can be positioned on the said optical sheet 430, and the position of said prismatic lens 431 and said diffusion sheet 432 is not limited to this.
Said reverberator 450 can be positioned at below the said LGP 440.Said reverberator 450 can upwards reflect from said light source 420 and then through the said LGP 440 downward light of launching.
Said bottom 460 comprises bottom 462 and extends to form the sidepiece 464 of spatial accommodation from said bottom 462.Said spatial accommodation can hold said light source 420, said optical sheet 430, said LGP 440 and said reverberator 450.
Said mold frame 470 is approximately the framework of rectangle.Said mold frame 470 up and down mode is fastened to bottom 460 from the upside of bottom 460.
Fig. 8 to 10 is decomposition diagram and cross-sectional views of structure of the back light unit 500 of diagram exemplary embodiments according to the present invention.
Fig. 8 to 10 has shown the Staight downward type backlight unit, but the back light unit of other types also is fine.Because the component variations that causes except that the position of light source and according to the position of light source, the back light unit shown in Fig. 8 to 10 is roughly identical with the back light unit shown in Fig. 5 to 7, so briefly carry out or the descriptions thereof are omitted fully.
Shown in Fig. 8 to 10, said back light unit 500 can be included in the LCD and light is provided for the display panels that comprises in the LCD.
Said back light unit 500 comprises light source 520 and optical sheet 530.Said back light unit 500 can further comprise reverberator 550, bottom 560, mold frame 570 and diffuser plate 580.
At least one light source 520 can be set below diffuser plate 580.Therefore, the light from said light source 520 can be directly incident on the said diffuser plate 580.
Said optical sheet 530 can be positioned on the said diffuser plate 580.Said optical sheet 530 can be assembled the light from said light source 520.
As shown in Figure 8, said optical sheet 530 can comprise reflection polarizing film 530a and the first diffusion layer 530b on said reflection polarizing film 530a.The said first diffusion layer 530b can comprise a plurality of first diffusion particles.Said first diffusion particle can have the volume distributed median as the diameter function.For the diameter D of first diffusion particle corresponding with the maximal value of volume distributed median, having said first diffusion particle the percent by volume in said first diffusion layer of diameter between D-2 μ m and D+2 μ m is 40 % to 80%.
As shown in Figure 9, said optical sheet 530 can further be included in the second diffusion layer 530c below the said reflection polarizing film 530a, and the said second diffusion layer 530c comprises a plurality of second diffusion particles.Said second diffusion particle can have the volume distributed median as the diameter function.For the diameter D of second diffusion particle corresponding with the maximal value of volume distributed median, having said second diffusion particle the percent by volume in said second diffusion layer of diameter between D-2 μ m and D+2 μ m is 40% to 80%.
Through above-mentioned characteristic, said optical sheet 530 can improve the brightness uniformity of light.As a result, can improve the display quality of said back light unit 500.
Can between said diffuser plate 580 and said optical sheet 530, be provided with at least one in prismatic lens 531 and the diffusion sheet 532.Said prismatic lens 531 or said diffusion sheet 532 can be positioned on the said optical sheet 530, and the position of said prismatic lens 531 and said diffusion sheet 532 is not limited to this.
Said diffuser plate 580 can and can upwards spread the light from said light source 520 between said light source 520 and said optical sheet 530.Because the said diffuser plate 580 on the said light source 520, so can not see said light source 520 from the top of back light unit 500, said diffuser plate 580 can further spread the light from said light source 520.
Figure 11 to 13 is decomposition diagram and cross-sectional views of structure of the LCD 600 of diagram exemplary embodiments according to the present invention.LCD 600 shown in Figure 11 to 13 comprises the back light unit shown in Fig. 5 to 7, but is not limited to this.For example, said LCD 600 can comprise the back light unit shown in Fig. 8 to 10.Because described the back light unit shown in Figure 11 to 13 with reference to Fig. 5 to 7 above, so briefly carry out or the descriptions thereof are omitted fully.
Shown in Figure 11 to 13, said LCD 600 can use the electro-optical characteristic of liquid crystal to come display image.
Said LCD 600 can comprise back light unit 610 and display panels 710.
Said back light unit 610 can be positioned at below the said display panels 710 and light is provided can for said display panels 710.
Said back light unit 610 can comprise light source 620 and optical sheet 630.
Said optical sheet 630 can comprise reflection polarizing film 630a and the first diffusion layer 630b on said reflection polarizing film 630a.The said first diffusion layer 630b can comprise a plurality of first diffusion particles.Said first diffusion particle can have the volume distributed median as the diameter function.For the diameter D of first diffusion particle, having said first diffusion particle the percent by volume in said first diffusion layer of diameter between D-2 μ m and D+2 μ m is 40% to 80%.
As shown in Figure 12, said optical sheet 630 can further be included in the second diffusion layer 630c below the said reflection polarizing film 630a, and the said second diffusion layer 630c comprises a plurality of second diffusion particles.Said second diffusion particle has the volume distributed median as the diameter function.For the diameter D of second diffusion particle, having said second diffusion particle the percent by volume in said second diffusion layer of diameter between D-2 μ m and D+2 μ m is 40% to 80%.
In said optical sheet 630, said reflection polarizing film 630a can improve the efficient of light, and said first and second diffusion layer 630b and 630c can improve the diffusion effect of light.Therefore, can improve the brightness uniformity of light.As a result, can improve the display quality of said back light unit 610.
Said back light unit 610 can further comprise LGP 640, reverberator 650, bottom 660 and mold frame 670.
Can between said LGP 640 and said optical sheet 630, be provided with at least one in prismatic lens 631 and the diffusion sheet 632.Said prismatic lens 631 or said diffusion sheet 632 can be positioned on the said optical sheet 630, and the position of said prismatic lens 631 and said diffusion sheet 632 is not limited to this.
Said display panels 710 can be positioned on the said mold frame 670.Said display panels 710 can be fixing through the top cover 720 that is fastened to said bottom 660 with the upper and lower formula.
The light display image that said display panels 710 can use the light source 620 by said back light unit 610 to provide.
Said display panels 710 can comprise filter substrate 712 respect to one another and thin film transistor base plate 714, between said filter substrate 712 and said thin film transistor base plate 714, accompanies liquid crystal.
Said filter substrate 712 can obtain the color of images displayed on said display panels 710.
Said filter substrate 712 can comprise the color filter array that is positioned at by the form of film on the substrate that forms such as glass or the such transparent material of plastics.For example said filter substrate 712 can comprise redness, green and blue color filter.Said filter substrate 712 is provided with upper polarizer.
Said thin film transistor base plate 714 through drive membrane 616 with its on a plurality of circuit blocks have been installed printed circuit board (PCB) 618 be electrically connected.Said thin film transistor base plate 714 can come to apply the driving voltage that is provided by said printed circuit board (PCB) 618 for liquid crystal in response to the drive signal that is provided by said printed circuit board (PCB) 618.
Said thin film transistor base plate 714 can comprise thin film transistor (TFT) and the pixel electrode that is positioned at by on another substrate that forms such as glass or the such transparent material of plastics.Can below said thin film transistor base plate 714, be provided with polaroid down.
As stated; Can be controlled in the exemplary embodiments according to the present invention said optical sheet, comprise the back light unit of said optical sheet and comprise the ratio of the specific dimensions particle in the said diffusion layer of LCD of said back light unit, thereby diffusion light and improve uniform luminance.
In addition, according to the present invention the said optical sheet of exemplary embodiments, comprise the back light unit of said optical sheet and comprise that the LCD of said back light unit can be through the uniform luminance that comprises that further said second diffusion layer that is positioned at below the said reflection polarizing film further improves said optical sheet.
Under the situation that does not break away from spirit of the present invention or scope, in exemplary embodiments of the present invention, can carry out various modifications and variation, this it will be apparent to those skilled in the art that.Thereby, the invention is intended to cover the modification of the present invention and the variation that fall in appended request scope and the equivalent scope thereof.
Claims (16)
1. optical sheet comprises:
Reflection polarizing film; With
First diffusion layer on said reflection polarizing film, said first diffusion layer comprises a plurality of first diffusion particles,
Wherein when the diameter that in the volume of said first diffusion particle, has peaked said first diffusion particle is D μ m; The volume summation of said first diffusion particle of diameter between D-2 μ m and D+2 μ m is 40% to 80% of the said first diffusion particle cumulative volume, and
Wherein D is 3 μ m to 6 μ m.
2. optical sheet according to claim 1, the minimum diameter of wherein said first diffusion particle are 0.5 μ m.
3. optical sheet according to claim 1, the maximum gauge of wherein said first diffusion particle are 10 μ m.
4. optical sheet according to claim 1, wherein each said first diffusion particle is a kind of in bubble and the globule.
5. optical sheet according to claim 1, wherein said first diffusion particle is formed by the material of from the group of being made up of polymetylmethacrylate, polystyrene, silicon and their compound, selecting.
6. optical sheet according to claim 1 further is included in first tack coat between said reflection polarizing film and said first diffusion layer.
7. optical sheet according to claim 1 further is included in second diffusion layer below the said reflection polarizing film, and said second diffusion layer comprises a plurality of second diffusion particles.
8. optical sheet according to claim 7 further is included in second tack coat between said reflection polarizing film and said second diffusion layer.
9. optical sheet according to claim 7; Wherein when the diameter that in the volume of said second diffusion particle, has peaked said second diffusion particle was D μ m, the volume summation of said second diffusion particle of diameter between D-2 μ m and D+2 μ m was 40% to 80% of the said second diffusion particle cumulative volume.
10. optical sheet according to claim 1, wherein said reflection polarizing film comprise alternately laminated and have the ground floor and the second layer of different refractivity.
11. a back light unit comprises:
Light source; With
Optical sheet on said light source, said optical sheet comprise reflection polarizing film and first diffusion layer on said reflection polarizing film, and said first diffusion layer comprises a plurality of first diffusion particles,
Wherein when the diameter that in the volume of said first diffusion particle, has peaked said first diffusion particle is D μ m; The volume summation of said first diffusion particle of diameter between D-2 μ m and D+2 μ m is 40% to 80% of the said first diffusion particle cumulative volume, and
Wherein D is 3 μ m to 6 μ m.
12. back light unit according to claim 11 further is included in second diffusion layer below the said reflection polarizing film, said second diffusion layer comprises a plurality of second diffusion particles.
13. back light unit according to claim 12; Wherein when the diameter that in the volume of said second diffusion particle, has peaked said second diffusion particle was D μ m, the volume summation of said second diffusion particle of diameter between D-2 μ m and D+2 μ m was 40% to 80% of the said second diffusion particle cumulative volume.
14. a LCD comprises:
Light source;
Optical sheet on said light source, said optical sheet comprise reflection polarizing film and first diffusion layer on said reflection polarizing film, and said first diffusion layer comprises a plurality of first diffusion particles; With
Display panels on said optical sheet,
Wherein when the diameter that in the volume of said first diffusion particle, has peaked said first diffusion particle is D μ m; The volume summation of said first diffusion particle of diameter between D-2 μ m and D+2 μ m is 40% to 80% of the said first diffusion particle cumulative volume, and
Wherein D is 3 μ m to 6 μ m.
15. LCD according to claim 14 further is included in second diffusion layer below the said reflection polarizing film, said second diffusion layer comprises a plurality of second diffusion particles.
16. LCD according to claim 15; Wherein when the diameter that in the volume of said second diffusion particle, has peaked said second diffusion particle was D μ m, the volume summation of said second diffusion particle of diameter between D-2 μ m and D+2 μ m was 40% to 80% of the said second diffusion particle cumulative volume.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2008-0049663 | 2008-05-28 | ||
| KR20080049663 | 2008-05-28 | ||
| KR1020080049663 | 2008-05-28 | ||
| KR1020080083867 | 2008-08-27 | ||
| KR10-2008-0083867 | 2008-08-27 | ||
| KR1020080083867A KR100962442B1 (en) | 2008-05-28 | 2008-08-27 | Optical Sheet, Back light Unit And Liquid Crystallization Display Comprising Thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101592747A CN101592747A (en) | 2009-12-02 |
| CN101592747B true CN101592747B (en) | 2012-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101879082A Active CN101592747B (en) | 2008-05-28 | 2008-12-23 | Optical sheet, backlight unit, and liquid crystal display |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR100962442B1 (en) |
| CN (1) | CN101592747B (en) |
| TW (1) | TWI380087B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI596385B (en) * | 2012-02-13 | 2017-08-21 | 東麗股份有限公司 | Reflective film |
| KR20170064039A (en) * | 2015-11-30 | 2017-06-09 | 엘지디스플레이 주식회사 | Optical Film And Liquid Crystal Display Comprising The Same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1174266C (en) * | 1999-09-20 | 2004-11-03 | 3M创新有限公司 | Optical films having at least one particle-containing layer |
| CN101124495A (en) * | 2005-02-21 | 2008-02-13 | 富士胶片株式会社 | Method of designing diffusion film, process for producing the same, and diffusion film obtained thereby |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5102955B2 (en) * | 2005-01-06 | 2012-12-19 | 株式会社ジロオコーポレートプラン | Light diffusion sheet and backlight unit using the same |
| KR20070071346A (en) * | 2005-12-30 | 2007-07-04 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | An optical film composite for bright enhancement comprising a birefringent polymer layer |
| KR100885608B1 (en) * | 2006-05-30 | 2009-02-24 | 주식회사 엘지화학 | Multi-layered light diffusion plate and liquid crystal display device comprising the same |
| US20080002256A1 (en) | 2006-06-30 | 2008-01-03 | 3M Innovative Properties Company | Optical article including a beaded layer |
-
2008
- 2008-08-27 KR KR1020080083867A patent/KR100962442B1/en active IP Right Grant
- 2008-11-20 TW TW097144846A patent/TWI380087B/en not_active IP Right Cessation
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1174266C (en) * | 1999-09-20 | 2004-11-03 | 3M创新有限公司 | Optical films having at least one particle-containing layer |
| CN101124495A (en) * | 2005-02-21 | 2008-02-13 | 富士胶片株式会社 | Method of designing diffusion film, process for producing the same, and diffusion film obtained thereby |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20090123749A (en) | 2009-12-02 |
| KR100962442B1 (en) | 2010-06-14 |
| TW200949365A (en) | 2009-12-01 |
| TWI380087B (en) | 2012-12-21 |
| CN101592747A (en) | 2009-12-02 |
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Effective date of registration: 20220225 Address after: Seoul, South Kerean Patentee after: LG CHEM, Ltd. Address before: Seoul, South Kerean Patentee before: LG ELECTRONICS Inc. |