CN101606087A - Diffuser plate - Google Patents
Diffuser plate Download PDFInfo
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- CN101606087A CN101606087A CNA2008800048450A CN200880004845A CN101606087A CN 101606087 A CN101606087 A CN 101606087A CN A2008800048450 A CNA2008800048450 A CN A2008800048450A CN 200880004845 A CN200880004845 A CN 200880004845A CN 101606087 A CN101606087 A CN 101606087A
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- diffusing sheet
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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
- G02B5/0273—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
- 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
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
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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
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
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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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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Elements Other Than Lenses (AREA)
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Abstract
The present invention has disclosed a kind of LCD or light diffusing sheet of the backlight module of lighting device of being used for, this light diffusing sheet comprises with polycarbonate resin or polyvinyl resin as base resin, and then appropriate brightness can be manifested and height covers character, or suitable character and the high brightness of covering, therefore, the use of optical thin film is reduced to when minimum, still can keep good luminous mass.Light diffusing sheet of the present invention has the splendid ability that can cover light source, and escapable cost is manufactured, and has high dimensional stability, even if therefore under the high temperature or the environment of high humility, the phenomenon of curling takes place in neither meeting, and then is guided out excellent light property.
Description
Technical field
The present invention relates to a kind of LCD or light diffusing sheet of the backlight module of lighting device of being used for.
Background technology
Along with industrial society towards advanced information age development, therefore, be used to show that the importance with the electronic console of the media of the various information of transmission also grows with each passing day.In the past, bulky cathode-ray tube (CRT) (Cathode Ray Tube is hereinafter to be referred as CRT) was widely used, but to install the viewpoint of CRT requisite space, but faced considerable restriction, had large-sized CRT so that be difficult to make.Therefore, CRT is replaced by various forms of flat-panel screens gradually, comprises LCD (LCD), plasma display (PDP), Field Emission Display (FED) and display of organic electroluminescence (EL).In these flat-panel screens, LCD particularly is for a kind of technology-intensive property product that produces in conjunction with liquid crystal-semiconductor technology, because it is frivolous and power consumption is low, so take advantage.Therefore, its structure and The Study of Manufacturing Technology and development are constant.Now, be applied to using the LCD in screen and Portable personal communication apparatus fields such as (PDA(Personal Digital Assistant) and mobile phones) such as mobile computer, desktop PC, be manufactured into bigger size, thereby LCD can be applied to large-sized TV, high image quality (High Definition, HD) TV for example.Therefore, LCD is as a kind of novel display that can replace in the past just as the CRT as the display synonym, and gets most of the attention.
In LCD,,, cause and in each pixel (pixel), pass the light intensity Be Controlled of liquid crystal and reach contrast (contrast) effect so additionally provide light source at its back side because liquid crystal itself can't launch light.More specifically, LCD adjusts the device of penetrability as a kind of electrical properties of using liquid crystal material, is installed in the illuminator emission light on surface thereafter certainly, and, the highest for luminescence efficiency is promoted to, the light of being launched penetrates various functional sheets or function film in this way, cause light to become evenly and the tool directivity, afterwards, the controlled light of this kind also penetrates colored filter, thereby realizes red, green and blue (R, G, B) color.More and, LCD is an indirect light emission form, sees through electric approach, by each pixel of control to recently realizing image.Therefore, aspect the quality of judging the LCD image, comprise brightness and homogeneity, be equipped with the light emitting devices of light source to be considered to crucial.
This kind light emitting devices generally includes light source, reflecting plate, light guide plate, reflection-type high brightness film, prism film, optical diffusion film and light diffusing sheet.Can use various forms of plates or film, cause light can arrive liquid-crystal apparatus as far as possible in large quantities from light source.
In these films or plate, light diffusing sheet has simultaneously makes the brightness of the light of launching from illuminator even, and the function of covering the bright rays of lamp, and light diffusing sheet is also played the part of the role who supports other optical thin film.Light diffusing sheet is added with various light diffusing agents (light-diffusing agent), with refraction, scattering and the reflection that causes light, and then is guided out diffusional effect.
For from a large amount of light of light diffusing sheet transmission to front surface, need installing comprise different films such as optical diffusion film or prism film.Yet, owing to increase the material of this kind multilayer, thereby cause manufacturing cost to improve and throughput rate decline.
Optical diffusion film in the screening performance of auxiliary diffuser plate, also diffusion into the light emitted and light is passed to front surface effectively.Generally speaking, optical diffusion film comprises transparency carrier and diffusion layer, and this diffusion layer is formed on the surface of this transparency carrier.This diffusion layer comprises the sphere material particle as scattering diluent, and, by the adhesive agent of this diffusion layer, and be included in this scattering diluent in this adhesive agent between refractive index difference, realize the diffusional effect of optical diffusion film.Because this scattering diluent intersperses among in the diffusion layer, therefore when light passes this diffusion layer, light constantly between two media with different refractivity mobile mutually in, transmitted.
In addition, reach the target of a large amount of light of transmission, therefore need provide prism film, but this measure but can cause manufacturing cost to increase and reduce throughput rate fruit afterwards to front surface in order to see through optical diffusion film.
Summary of the invention
Therefore, the invention provides a kind of light diffusing sheet with single layer structure, it can manifest appropriate brightness and the excellent character of covering.
In addition, the invention provides a kind of light diffusing sheet with sandwich construction, it can manifest appropriate brightness and the excellent character of covering.
In addition, the invention provides a kind of light diffusing sheet with single layer structure, its can keep cover character in, by adjusting total transmittancy to manifest sufficient brightness.
In addition, the invention provides a kind of light diffusing sheet with sandwich construction, its can keep cover character in, by adjusting total transmittancy to manifest sufficient brightness.
In addition, the invention provides a kind of light diffusing sheet, the form and the quantity of its light diffusing agent are adjusted, to manifest maximum brightness.
In addition, the invention provides a kind of light diffusing sheet, can reduce the manufacturing cost of LCD, and then produce economic benefit.
Therefore in addition, the invention provides a kind of light diffusing sheet, the phenomenon of curling even under the environment of high temperature and high humility, still can not take place, and can represent excellent light diffusing matter in its dimensional stability height.
A kind of light diffusing sheet that first embodiment of the invention provided, by be selected from polycarbonate resin, polystyrene resin, and composition thereof a kind of base resin formed, and, at least one surface of this light diffusing sheet, be formed with graph layer.The total transmittancy of this light diffusing sheet is equal to or higher than 40%, and brightness is 4500cd/mm
2
A kind of light diffusing sheet that second embodiment of the invention provided includes a basic unit, by be selected from polycarbonate resin, polystyrene resin, and composition thereof a kind of base resin formed; One top layer is formed at least one surface of this basic unit; And a graph layer, be formed at least one surface on this top layer.The total transmittancy of this light diffusing sheet is equal to or higher than 40%, and brightness is 4500cd/mm
2
A kind of light diffusing sheet that third embodiment of the invention provided, by be selected from polycarbonate resin, polystyrene resin, and composition thereof a kind of base resin formed.The mist degree of this light diffusing sheet is equal to or less than 90%, and total transmittancy is equal to or higher than 80%.
A kind of light diffusing sheet that fourth embodiment of the invention provided includes a basic unit, by be selected from polycarbonate resin, polystyrene resin, and composition thereof a kind of base resin formed; And a top layer, be formed at least one surface of this basic unit.The mist degree of this light diffusing sheet is equal to or less than 90%, and total transmittancy is equal to or higher than 80%.
The light diffusing sheet of first embodiment of the invention to the four embodiment can further comprise the light diffusing agent that a kind of particle diameter is equal to or less than 100 μ m.
In the light diffusing sheet of first embodiment of the invention to the four embodiment, this light diffusing agent can be one or more and is selected from the following group that constitutes: particles of acrylic polymer (acrylic polymer particles); Styrene polymer particle (styrene polymer particles); Olefin polymer particle (olefin polymerparticles); Propylene and styrol copolymer particle; Propylene and olefin copolymer particle; Styrene and olefin copolymer particle; Multilayer multicomponent particle by forming earlier homopolymer, multipolymer or trimer particle, gets its covering with the monomer of other type afterwards again; The siloxane polymer particle; The fluororesin particle; Calcium carbonate particle; The barium sulphate particle; Silicon oxide particle; Aluminum hydroxide particles; Titanium particles; Zirconia particles; The magnesium fluoride particle; The talcum particle; Glass particle; And mica.
The light diffusing sheet of third embodiment of the invention and the 4th embodiment can further comprise one and be formed at least one lip-deep graph layer of this light diffusing sheet.
In the light diffusing sheet of first embodiment of the invention to the four embodiment, it is polygon, semicircle or half elliptic polyhedron-shaped that this graph layer can comprise a plurality of sections; Or section is polygon, semicircle or half elliptic cylinder body shape; And these figures can adjacent one another are separately or non-conterminous arrangement.
In the light diffusing sheet of first embodiment of the invention to the four embodiment, this polystyrene resin can have the glass transition temperature that is equal to or higher than 105 ℃.
In the light diffusing sheet of first embodiment of the invention to the four embodiment, this polystyrene resin can be its interior copolymerization acrylic acid polystyrene resin.
According to an aspect of of the present present invention, this light diffusing sheet can manifest sufficient brightness and the excellent character of covering, when therefore even if this light diffusing sheet is applied to have the backlight module of giant-screen, still can cover the image of light source fully, and, the dimensional stability height of this light diffusing sheet, even make it under the environment of high temperature and high humility, still rare curling phenomenon.
In addition, according to another aspect of the present invention, this light diffusing sheet has high total transmittancy and enough high brightness, so can keep good light launch mass.Therefore, this light diffusing sheet reduces the use of optical thin film, and then reduces its manufacturing cost, and, the dimensional stability height of this light diffusing sheet, even make it under the environment of high temperature and high humility, still rare curling phenomenon.
Description of drawings
Fig. 1 is a stereographic map, shows the diffuser plate of first embodiment of the invention;
Fig. 2 is a stereographic map, shows the diffuser plate of second embodiment of the invention;
Fig. 3 is a stereographic map, shows the diffuser plate of third embodiment of the invention;
Fig. 4 is a stereographic map, shows the diffuser plate of fourth embodiment of the invention.
Wherein, description of reference numerals is as follows:
10 basic units, 20 top layers
30,40,50,60 graph layers
Embodiment
Below will be described in detail the present invention.
The invention provides a kind of the have single layer structure or the light diffusing sheet of sandwich construction, manifest appropriate brightness and the excellent character of covering.This kind light diffusing sheet is to comprise that by a kind of the base resin of polycarbonate resin and polystyrene resin is formed; Aforesaid polycarbonate resin and polystyrene resin can use separately or mix use.
Polycarbonate resin has excellent in impact resistance and penetrability, and good low-temperature resistance and electrical specification, and has heat-resisting quantity and anti-absorbability, so its dimensional stability is very high.Therefore, the spendable temperature range of polycarbonate resin is very wide, also thereby be applied to optical mirror slip, discs material, safety helmet, protective device and coverture etc.
Employed polycarbonate resin comprises among the present invention, by dihydric phenol (dihydroxy phenol) and phosgene (phosgene) reaction, or dihydric phenol and carbonate precursor (carbonate precursor) reaction gained, as the carbonic ester homopolymer of typical aromatic polycarbonate resin, linearity and side chain, polyester copolymer, and composition thereof.The example of dihydric phenol comprises 2, two (4-hydroxy phenyl) propane (being bisphenol-A) (2 of 2-, 2-bis (4-hydroxyphenyl) propane, bisphenol A), two (4-hydroxy phenyl) methane (bis (4-hydroxyphenyl) methane), 2, two (the 4-hydroxyls-3 of 2-, the 5-3,5-dimethylphenyl) propane (2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane) and 1,1-bis(4-hydroxyphenyl)cyclohexane (1,1-bis (4-hydroxyphenyl) cyclohexane); And the example of carbonate precursor comprises diphenyl carbonate (diphenyl carbonate), carbonylic halide (carbonyl halide) and diaryl carbonate (diaryl carbonate).
Employed polycarbonate resin among the present invention, under the condition of 1.2 kilograms of 300 ℃ and loadings, (melt index MI) is per 10 minutes 7 to 30 grams (7～30g/10min) to the melting index that defines according to ASTM D1238.
Aspect base resin, when independent use polystyrene resin, can use to have the glass transition temperature and be equal to or higher than 105 ℃ example, to increase thermotolerance; And, employed polystyrene resin, the acrylic acid in it is the copolymerization form.
Because polystyrene resin is firm, colourless and transparent, and has good electrical properties, so and because it can produce with low costly in a large number, therefore be applied to various fields, comprise commodity, such as kitchen part, stationery material and furniture; Mechanical with large-scale model part; And electrical equipment (electrochemical goods), such as television cabin.
Aspect base resin, when using the potpourri of polycarbonate resin and polystyrene resin, can use under the condition of 5 kilograms of 200 ℃ and loadings, (melt index MI) is per 10 minutes 0.5 to 3 gram (0.5～3g/10min) polystyrene resins to the melting index that defines according to ASTM D1238.
When using the potpourri of polycarbonate resin and polystyrene resin, it can be the double screw extruder (twin screw extruder) that uses diameter 30mm, at motor rotary speed 250rpm, and 200 to 300 ℃ of forming temperatures, be preferably melting mixing (melt-mixed) under 250 ℃ of conditions.
When polycarbonate resin mixes with polystyrene resin, for the pliability that reaches polycarbonate resin and the advantage of dimensional stability, and the anti-absorbability of polystyrene resin and the advantage of intensity, two part by weight that mix can be 1 to 9 to 9 to 1.
Or the light diffusing sheet among the present invention can have sandwich construction, and this sandwich construction includes a basic unit, and this basic unit one the surface or two lip-deep top layers.
The composition on this top layer is not particularly limited, and, for instance, be used for the base resin on this top layer, comprise the styrene-propene acid copolymer resin that is obtained by propylene copolymerization acid monomers and styrene monomer.
As useful monomer, this acrylic monomers comprises and is selected from following one or more, alkyl methacrylate (methacrylic acid alkyl ester), alkyl acrylate (acrylic acid alkyl ester), methacrylic acid cycloalkanes ester (methacrylic acid cycloalkyl ester), acrylic acid cycloalkanes ester (acrylic acidcycloalkyl ester), metering system acid aryl ester (methacrylic acid aryl ester) and aryl acrylate (acrylic acid aryl ester); And styrene monomer comprises styrene or substituted styrene.Aforementioned substituted styrene comprises ring-alkylated styrenes (alkyl styrene), for example α-Jia Jibenyixi (α-methylstyrene); Halogenated styrenes (halogenated styrene), for example chlorostyrene (chlorostyrene); And vinylstyrene (vinyl styrene).In addition, depend on the needs, also can use two kinds or the composition of multiple styrene monomer.
Particularly, when using the styrene-propene acid copolymer resin, consider the adhesion to this basic unit, acrylic monomers carries out the proportional range of copolymerization from 6 to 4 to 1 to 9 with styrene monomer.
Light diffusing sheet of the present invention can further comprise a graph layer, is positioned at least one surface of this light diffusing sheet.This graph layer is kept appropriate brightness in order to when character is covered in improvement.
As shown in Figures 1 to 4, graph layer has a plurality of figures, and respectively this figure to have section be polygon, semicircle or half elliptic polyhedron-shaped; Or section is polygon, semicircle or half elliptic cylinder body shape; Or, can use the composition of one or more shapes.And these figures can adjacent one another are separately or non-conterminous arrangement.
Fig. 1 shows the light diffusing sheet that comprises a basic unit and a top layer, and this light diffusing sheet comprises that further by a plurality of sections be semicircular cylinder, is arranged on the surface on this top layer a graph layer of being formed linearly.And the shown light diffusing sheet of Fig. 2, its graph layer is arranged with preset space length by a plurality of, and section is formed by semicircular cylinder.The light diffusing sheet that Fig. 3 is shown, its graph layer is arranged with preset space length by a plurality of, and section is formed by the semicircular cylinder of modified.The light diffusing sheet that Fig. 4 is shown, its graph layer is arranged with preset space length by a plurality of, and section is formed by the taper tetrahedron.
Thus, this graph layer further is formed on this basic unit and/or this top layer, but causes the light path Be Controlled of passing through, and the light after the diffusion is transferred to front surface, thereby keeps the ability that the light source image is covered in suitably brightness and lifting.
According to embodiments of the invention, the total transmittancy of light diffusing sheet is equal to or higher than 40%, and brightness is equal to or higher than 4500cd/mm
2
Under the situation that meets this total transmittancy and brightness, light diffusing sheet has excellent character and the appropriate brightness of covering, thereby can be applicable to the backlight module of large tracts of land LCD, and then covers the image of light source effectively.
Though the present invention cooperates graphic, as the exposure as above-mentioned, yet, these are graphic only in order to narration the present invention, and should not be construed as restriction the present invention, and have the knack of this technical field, not violating various modifications and the variation of being engaged under the technical spirit of the present invention, all belong to category of the present invention.
When light diffusing sheet comprises the surface that is formed at this basic unit or during two lip-deep top layers, this top layer is formed in this basic unit such as co-extrusion pressure is molded, stacking, heat is sticked together or known procedure for processing such as surface-coated by carrying out.
When light diffusing sheet comprises this graph layer, this graph layer by carry out such as stacking, heat is sticked together, lift-over seal, film transfer printing, press known procedure for processing such as transfer printing or printing, formed.
In addition, the invention provides a kind of light diffusing sheet, meet suitable character and the high brightness of covering, and reduce the use of optical thin film significantly, even and if under the condition that lacks graph layer, still can reach aforesaid characteristic.
Base resin as used herein, the sandwich construction that sees through extra formation top layer and the specific composition on this top layer, all as defined above.
In this example, the mist degree of light diffusing sheet is equal to or less than 90%, and total transmittancy is equal to or higher than 80%, and this light diffusing sheet shows suitable character and the high brightness of covering, and also therefore can reduce the quantity of extra use optical thin film.Particularly, this diffuser plate can be very usefully as the diffusion barrier of the backlight module that is used to have proper area.
Decide on demand, cover character and increase brightness, aforesaid graph layer can further be provided in order further to improve.
Among the embodiment of light diffusing sheet of the present invention, can use a kind of light diffusing agent.The refractive index of this light diffusing agent is different from the refractive index of this base resin usually, and in order to increasing the diffusivity of light, and is responsible for giving suitable character, penetrability and the scattering nature of covering.
This light diffusing agent comprises various organic and inorganic particulates.The prominent example of organic filler comprises particles of acrylic polymer, such as methyl methacrylate (methylmethacrylate), Jia Jibingxisuanyizhi (ethylmethacrylate), isobutyl methacrylate (isobutylmethacrylate), n-BMA (n-butylmethacrylate), methacrylic acid normal-butyl methyl esters (n-butylmethylmethacrylate), acrylic acid (acrylic acid), methacrylic acid (methacrylicacid), hydroxyethyl methylacrylate (hydroxyethylmethacrylate), hydroxy propyl methacrylate (hydroxypropylmethacrylate), hydroxy-ethyl acrylate (hydroxyethylacrylate), acrylamide (acryl amide), n-methylolacrylamide (methylol acryl amide), glytidyl methacrylate (glycidyl methacrylate), ethyl acrylate (ethylacrylate), isobutyl acrylate (isobutylacrylate), n-butyl acrylate (n-butylacrylate), 2-EHA (2-ethylhexylacrylate), with and polymkeric substance, multipolymer or trimer; The styrene polymer particle, such as styrene, substituted styrene, with and polymkeric substance, multipolymer or trimer; Olefin polymer particle is such as tygon and polypropylene; Propylene and styrol copolymer particle; Propylene and olefin copolymer particle; Styrene and olefin copolymer particle; Multilayer multicomponent particle by forming earlier homopolymer, multipolymer or trimer particle, gets its covering with the monomer of other type afterwards again; The siloxane polymer particle; And fluororesin particle.
The example of inorganic particulate comprises lime carbonate, barium sulphate, monox, aluminium hydroxide, titanium dioxide, zirconia, magnesium fluoride, talcum, glass and mica.The light diffusing of organic filler is of fine quality in the light diffusing matter of inorganic particulate, and, decide on demand, can use two kinds or multiple light diffusing agent composition.
When the refractive index difference between light diffusing agent and base resin is very big, although only use a spot of light diffusing agent, still can show photodiffusion effect.On the contrary, when the refractive index difference between light diffusing agent and base resin is very little, then must use a large amount of relatively light diffusing agents.
Generally, when the consumption of light diffusing agent increased, brightness also was considered to and can increases.Yet when the consumption of light diffusing agent was too much, brightness can reduce on the contrary.Therefore, the consumption of light diffusing agent is adjusted to and makes light diffusing sheet can show suitable character and the high brightness of covering.
Light diffusing sheet cover character and brightness, can see through separately and use, or being used in combination following the whole bag of tricks is adjusted.
First method comprises, consider base resin and light diffusing agent between under the situation of refractive index difference, adjust the consumption of light diffusing agent; Second method comprises, is under the situation of sandwich construction at light diffusing sheet, adjusts the content of the light diffusing agent on basic unit and top layer; The third method comprises the type of adjusting light diffusing agent; And the 4th kind of method comprises the size of adjusting light diffusing agent.
For instance, be benchmark with the base resin of 100 weight portions, when the consumption of light diffusing agent is equal to or less than 10 weight portions, can produce mist degree and be equal to or less than 90%, and total transmittancy is equal to or higher than 80% light diffusing sheet.When further providing graph layer, total transmittancy can further reduce, and then increase is covered character and manifested appropriate brightness.
When light diffusing agent is used for the top layer, the amount of light diffusing agent must be along with the refractive index of the base resin that is used for the top layer, with the amount of the light diffusing agent of basic unit and change, and, this base resin that is used for the top layer with 100 weight portions is a benchmark, and the amount that is used for the light diffusing agent on top layer can be set equal to or be less than 20 weight portions.
The particle diameter of light diffusing agent can be equal to or less than 100 μ m.
In addition, decide on demand, light diffusing sheet of the present invention can further be added with processing procedure stabilizing agent (process stabilizer), ultraviolet light absorber (UV absorber) or ultra-violet stabilizer (UVstabilizer).
See through following examples and will understand the present invention more, yet the following example is only in order to narration the present invention, and should not be construed as restriction the present invention.
Embodiment 1 to 12
Constituent and the proportion of composing of embodiment 1 to 12 are shown in following table 1.
Employed polycarbonate resin, under the condition of 1.2 kilograms of 300 ℃ and loadings, the melting index (MI) that defines according to ASTM D1238 is per 10 minutes 22 grams (22g/10min).
In these embodiments, base resin for example, when polycarbonate and polystyrene used with the form of potpourri, the proportion of composing shown with table 1 added, re-use afterwards double screw extruder under 250 ℃ with its melting mixing.
Employed polystyrene resin, under the condition of 5 kilograms of 200 ℃ and loadings, the melting index (MI) that defines according to ASTMD1238 is per 10 minutes 1.5 grams (1.5g/10min).
The base resin aspect that is used for the top layer is to use the typical styrene-propene acid copolymer resin in table 1 constituent.
In the constituent of light diffusing sheet, this basic unit is made up of a base resin in table 1 constituent and a light diffusing agent, and ultraviolet light absorber with 0.5 weight portion, benzylidene malonate (tetraethyl-2 for example, 2 '-(1,4-phenylene-dimethylidene)-bismalonate, B-Cap) as light stabilizer; This top layer is made up of a base resin in table 1 constituent and a light diffusing agent, and ultraviolet light absorber with 2 weight portions, benzylidene malonate (tetraethyl-2 for example, 2 '-(1,4-phenylene-dimethylidene)-and bismalonate, B-Cap) as light stabilizer.
This graph layer is positioned at the upper surface (as shown in Figure 1) of this light diffusing sheet, is to see through the cylinder coating to form a plurality of width (a) be that 150 μ m and height (b) are that the section of 75 μ m is formed by semicircular cylinder.
Particularly, embodiment 1 to 4 is relevant for a kind of diffuser plate that does not have the single layer structure on top layer; Embodiment 5 to 8 is relevant for a kind of basic unit and diffuser plate that is formed at this basic unit one lip-deep top layer of including; And embodiment 9 to 12 is formed at except this top layer on two surfaces of this basic unit relevant for having and the basic unit of embodiment 5 to 8 same composition compositions and the diffuser plate on top layer a kind of comprising.
Molded aspect, being to use diameter is single screw rod extruder of 135mm and 60mm, carries out co-extrusion pressure 250 ℃ of molding temperatures under with 220 ℃.In embodiment 1 to 4, the thickness of this basic unit is 2.0mm; In embodiment 5 to 8, the thickness of this basic unit is 1.9mm, and the thickness on this top layer is 0.1mm; And in embodiment 9 to 12, the thickness of this basic unit is 1.8mm, and the thickness on these two lip-deep these top layers of basic unit respectively is 0.1mm.
[table 1]
Measure total transmittancy, mist degree, brightness, crimpness, water absorptivity and the heat distortion temperature of the prepared light diffusing sheet of embodiment.Measurement result is shown in following table 2.
Measure total transmittancy and mist degree according to ASTM D1003, and use by the obtained LS-100 of Mei Leda (Minolta) and measure brightness.
The definition of crimpness is that diffuser plate is installed on 20 o'clock the backlight module, makes following 96 hours of the condition that it is in 60 ℃ and relative humidity 75% afterwards, the distance between four corners measuring then that diffuser plate upsweeps and backlight module surface.Absorptive definition then is light diffusing sheet to be cut into 10 square centimeters size, makes in its water that is in 25 ℃ 24 hours afterwards, then the weight change of measuring light diffuser plate.Heat distortion temperature according to ASTM D648 measuring light diffuser plate.
[table 2]
| Embodiment | Total transmittancy (%) | Mist degree (%) | Brightness (cd/m 2) | Crimpness (mm) | Water absorptivity (%) | Heat distortion temperature (℃) |
| 1 | 92.1 | 75.0 | 4864 | 0.20 | 0.19 | 123.1 |
| 2 | 91.9 | 79.0 | 4789 | 0.14 | 0.14 | 101.5 |
| 3 | 91.4 | 77.0 | 5771 | 0.21 | 0.20 | 121.9 |
| 4 | 90.1 | 81.0 | 5649 | 0.15 | 0.16 | 100.1 |
| 5 | 93.1 | 75.3 | 4971 | 0.20 | 0.18 | 119.3 |
| 6 | 93.9 | 75.9 | 4923 | 0.15 | 0.13 | 99.6 |
| 7 | 93.9 | 78.1 | 5917 | 0.21 | 0.19 | 118.1 |
| 8 | 93.6 | 77.9 | 5896 | 0.17 | 0.14 | 98.9 |
| 9 | 94.4 | 77.4 | 5071 | 0.18 | 0.17 | 117.1 |
| 10 | 94.1 | 78.1 | 5050 | 0.13 | 0.12 | 97.6 |
| 11 | 94.1 | 79.6 | 6005 | 0.20 | 0.17 | 115.9 |
| 12 | 94.5 | 79.1 | 5967 | 0.16 | 0.13 | 97.0 |
Can know by table 2 and to learn that the light diffusing sheet of all embodiment all has and is equal to or higher than 90% very high total transmittancy and excellent luminance.In addition, its dimensional stability is also very high.Particularly, compared to other light diffusing sheet that does not have graph layer, the embodiment 3,4,7,8,11 and 12 with graph layer has higher brightness.Compared to the PC use amount of the basic unit light diffusing sheet more than the PS use amount, the PS use amount of basic unit shows lower water absorptivity and heat distortion temperature more than the embodiment 2,4,6,8,10 and 12 of PC use amount; In addition, embodiment 2,4,6,8,10 and 12 crimpness also relatively reduce.
Measure the ability that embodiment 1,2,5,6,9 and 10 covers fluorescent tube.Particularly, light diffusing sheet is installed on 24 o'clock the backlight module, afterwards, diffusion barrier, prism film and reflection polarizing film installed thereon in order, then can be seen with the image of visual assessment fluorescent tube.The embodiment that can't see lamp image is defined as well, and can see that the embodiment of lamp image is defined as bad.The result shows, it is good that light diffusing sheet covers the ability of fluorescent tube.
Measurement has the embodiment 3,4,7,8,11 of graph layer and the ability that 12 light diffusing sheet covers fluorescent tube.Particularly, light diffusing sheet is installed on 32 o'clock the backlight module, afterwards, diffusion barrier, prism film and reflection polarizing film installed thereon in order, then can be seen with the image of visual assessment fluorescent tube.The embodiment that can't see lamp image is defined as well, and can see that the embodiment of lamp image is defined as bad.The result shows, it is good that light diffusing sheet covers the ability of fluorescent tube.
Embodiment 13 to 18
Light diffusing sheet is to make in the mode identical with embodiment 1 to 12, and manufactures identical size.In addition, only use the polystyrene resin (glass transition temperature 115 ℃) of its interior acrylic acid as part copolymerization form, base resin as basic unit, and in embodiment 15 and 16, the top layer is formed on the surface of basic unit, and in embodiment 17 and 18, the top layer is formed on two surfaces of basic unit
The concrete composition of the light diffusing sheet of embodiment 13 to 18 is shown in down in the tabulation 3.
[table 3]
Measurement is with total transmittancy, mist degree, brightness, crimpness, water absorptivity and the heat distortion temperature of the light diffusing sheet that this was obtained.Measurement result is shown in following table 4.
[table 4]
| Embodiment | Total transmittancy (%) | Mist degree (%) | Brightness (cd/m 2) | Crimpness (mm) | Water absorptivity (%) | Heat distortion temperature (℃) |
| 13 | 89.6 | 75.8 | 4752 | 0.15 | 0.16 | 110.2 |
| 14 | 88.4 | 79.5 | 5621 | 0.16 | 0.17 | 110.1 |
| 15 | 90.1 | 76.4 | 4816 | 0.15 | 0.15 | 109.8 |
| 16 | 90.5 | 79.6 | 5746 | 0.16 | 0.17 | 109.4 |
| 17 | 90.3 | 77.8 | 4953 | 0.17 | 0.17 | 110.3 |
| 18 | 90.8 | 78.6 | 5865 | 0.16 | 0.16 | 109.9 |
Can know by table 4 and to learn, using separately among the embodiment of the polystyrene resin that meets predetermined thermal character, total transmittancy, mist degree and crimpness do not change, and dimensional stability is identical during with use polycarbonate resin and polystyrene resin potpourri.
Embodiment 19 to 24
Light diffusing sheet is to make in the mode identical with embodiment 1 to 12, and manufacture identical size, in addition, the type aspect of granule proliferation, be to use silicon grain substitutional crylic acid resin particle, and in embodiment 21 and 22, the top layer is formed on the surface of basic unit, and in embodiment 23 and 24, the top layer is formed on two surfaces of basic unit.
The concrete composition of the light diffusing sheet of embodiment 19 to 24 is shown in down in the tabulation 5.
[table 5]
Measurement is with total transmittancy, mist degree, brightness, crimpness, water absorptivity and the heat distortion temperature of the light diffusing sheet that this was obtained.Measurement result is shown in following table 6.
[table 6]
| Embodiment | Total transmittancy (%) | Mist degree (%) | Brightness (cd/m 2) | Crimpness (mm) | Water absorptivity (%) | Heat distortion temperature (℃) |
| 19 | 48.5 | 99 | 4583 | 0.18 | 0.19 | 121.8 |
| 20 | 47.2 | 99 | 4516 | 0.16 | 0.17 | 100.1 |
| 21 | 48.7 | 99 | 4625 | 0.18 | 0.19 | 118.2 |
| 22 | 47.6 | 99 | 4576 | 0.17 | 0.18 | 99.1 |
| 23 | 48.9 | 99 | 4654 | 0.17 | 0.18 | 118.1 |
| 24 | 48.1 | 99 | 4585 | 0.16 | 0.16 | 99.5 |
Can know by table 6 and to learn that the total transmittancy of light diffusing sheet with graph layer is near 40% and the brightness height.
In addition, can this kind light diffusing sheet be installed on 32 o'clock the backlight module, afterwards, diffusion barrier, prism film and reflection polarizing film is installed thereon in order, then seen with the image of visual assessment fluorescent tube.The result shows, it is good that light diffusing sheet covers the ability of fluorescent tube.
Claims (11)
1. a light diffusing sheet is characterized in that, its by polycarbonate resin, polystyrene resin, with and composition thereof in the group that constituted a selected base resin formed, and at least one surface of this light diffusing sheet, be formed with a graph layer; The total transmittancy of this light diffusing sheet is equal to or higher than 40%, and brightness is 4500cd/mm
2
2. a light diffusing sheet is characterized in that, includes:
One basic unit, by polycarbonate resin, polystyrene resin, with and composition thereof in the group that constituted a selected base resin formed;
One top layer is formed at least one surface of this basic unit; And
One graph layer is formed at least one surface on this top layer;
The total transmittancy of this light diffusing sheet is equal to or higher than 40%, and brightness is 4500cd/mm
2
3. a light diffusing sheet is characterized in that, its by polycarbonate resin, polystyrene resin, with and composition thereof in the group that constituted a selected base resin formed; The mist degree of this light diffusing sheet is equal to or less than 90%, and total transmittancy is equal to or higher than 80%.
4. a light diffusing sheet is characterized in that, includes:
One basic unit, by polycarbonate resin, polystyrene resin, with and composition thereof in the group that constituted a selected base resin formed; And
One top layer is formed at least one surface of this basic unit;
The mist degree of this light diffusing sheet is equal to or less than 90%, and total transmittancy is equal to or higher than 80%.
5. as each described light diffusing sheet in the claim 1 to 4, it is characterized in that, further include the light diffusing agent that a particle diameter is equal to or less than 100 μ m.
6. light diffusing sheet as claimed in claim 5 is characterized in that, this light diffusing agent is selected from the following group that constitutes for one or more: particles of acrylic polymer; The styrene polymer particle; Olefin polymer particle; Propylene and styrol copolymer particle; Propylene and olefin copolymer particle; Multilayer multicomponent particle by forming earlier homopolymer, multipolymer or trimer particle, gets its covering with the monomer of other type afterwards again; The siloxane polymer particle; The fluororesin particle; Calcium carbonate particle; The barium sulphate particle; Silicon oxide particle; Aluminum hydroxide particles; Titanium particles; Zirconia particles; The magnesium fluoride particle; The talcum particle; Glass particle; And mica.
7. as claim 3 or 4 described light diffusing sheets, it is characterized in that, further include one and be formed at least one lip-deep graph layer of this light diffusing sheet.
8. light diffusing sheet as claimed in claim 1 or 2 is characterized in that, it is polygon, semicircle or half elliptic polyhedron-shaped that this graph layer includes a plurality of sections; Or section is polygon, semicircle or half elliptic cylinder body shape; And, the adjacent one another are separately or non-conterminous arrangement of this figures.
9. light diffusing sheet as claimed in claim 7 is characterized in that, it is polygon, semicircle or half elliptic polyhedron-shaped that this graph layer includes a plurality of sections; Or section is polygon, semicircle or half elliptic cylinder body shape; And, the adjacent one another are separately or non-conterminous arrangement of this figures.
10. as each described light diffusing sheet in the claim 1 to 4, it is characterized in that the glass transition temperature of this polystyrene resin is equal to or higher than 105 ℃.
11. light diffusing sheet as claimed in claim 10 is characterized in that, this polystyrene resin is that copolymerization has acrylic acid polystyrene resin in it.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020070016311A KR101187552B1 (en) | 2006-02-17 | 2007-02-16 | Diffusion plate |
| KR1020070016311 | 2007-02-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101606087A true CN101606087A (en) | 2009-12-16 |
Family
ID=39705190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008800048450A Pending CN101606087A (en) | 2007-02-16 | 2008-02-12 | Diffuser plate |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5600008B2 (en) |
| CN (1) | CN101606087A (en) |
| TW (1) | TWI378269B (en) |
| WO (1) | WO2008100058A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102206451A (en) * | 2010-03-30 | 2011-10-05 | 比亚迪股份有限公司 | Lampshade paint and preparation method thereof |
| CN102486549A (en) * | 2010-12-01 | 2012-06-06 | 奇美实业股份有限公司 | Optical plate with microstructures and manufacturing method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7708446B2 (en) | 2008-02-26 | 2010-05-04 | Sabic Innovative Plastic Ip B.V. | Display film stacks and a method of modeling the films |
| TW201007217A (en) * | 2008-08-12 | 2010-02-16 | Entire Technology Co Ltd | Resin composition and light diffusion plate with thermal resistance and impact resistance |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04327937A (en) * | 1991-04-26 | 1992-11-17 | Sekisui Chem Co Ltd | Embossed polycarbonate sheet and its manufacture |
| JP3732253B2 (en) * | 1995-05-18 | 2006-01-05 | 大日本印刷株式会社 | Manufacturing method of lens sheet for liquid crystal display device |
| JPH0980208A (en) * | 1995-09-07 | 1997-03-28 | Gunze Ltd | Light diffusing formed member and backlight device |
| US6628460B1 (en) * | 1998-08-05 | 2003-09-30 | Mitsubishi Rayon Co., Ltd. | Lens sheet and method for producing the same |
| JP2004053998A (en) * | 2002-07-22 | 2004-02-19 | Teijin Chem Ltd | Light diffusion film made of polycarbonate resin |
| WO2005066663A1 (en) * | 2004-01-05 | 2005-07-21 | Dai Nippon Printing Co., Ltd. | Light diffusion film, surface light source and liquid crystal display |
| TW200540527A (en) * | 2004-02-26 | 2005-12-16 | Takiron Co | Light diffusing sheet, and backlight unit using the light diffusing sheet |
| JP4638752B2 (en) * | 2004-04-12 | 2011-02-23 | 株式会社クラレ | Light diffusion plate |
| KR100665781B1 (en) * | 2004-09-10 | 2007-01-09 | 주식회사 새 한 | Optical diffuser plate with excellent optical properties, heat resistance and hygroscopicity |
| WO2006080798A1 (en) * | 2005-01-25 | 2006-08-03 | Kolon Ind. Inc./Kr | Light-diffusion plate |
| KR100638083B1 (en) * | 2005-02-02 | 2006-10-25 | 주식회사 코오롱 | Display front panel |
| JP2007010798A (en) * | 2005-06-28 | 2007-01-18 | Asahi Kasei Corp | Anisotropic scattering film |
| KR100885608B1 (en) * | 2006-05-30 | 2009-02-24 | 주식회사 엘지화학 | Multi-layered light diffuser plate and liquid crystal display device comprising the same |
-
2008
- 2008-02-12 WO PCT/KR2008/000820 patent/WO2008100058A1/en active Application Filing
- 2008-02-12 CN CNA2008800048450A patent/CN101606087A/en active Pending
- 2008-02-12 JP JP2009549517A patent/JP5600008B2/en not_active Expired - Fee Related
- 2008-02-14 TW TW97105226A patent/TWI378269B/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102206451A (en) * | 2010-03-30 | 2011-10-05 | 比亚迪股份有限公司 | Lampshade paint and preparation method thereof |
| CN102206451B (en) * | 2010-03-30 | 2013-11-06 | 比亚迪股份有限公司 | Lampshade paint and preparation method thereof |
| CN102486549A (en) * | 2010-12-01 | 2012-06-06 | 奇美实业股份有限公司 | Optical plate with microstructures and manufacturing method thereof |
| CN102486549B (en) * | 2010-12-01 | 2013-09-18 | 奇美实业股份有限公司 | Optical plate with microstructures and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5600008B2 (en) | 2014-10-01 |
| WO2008100058A1 (en) | 2008-08-21 |
| TW200903035A (en) | 2009-01-16 |
| TWI378269B (en) | 2012-12-01 |
| JP2010519568A (en) | 2010-06-03 |
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Open date: 20091216 |