CN103080644A - Light guide plate and edge-lit surface light source device using same - Google Patents
Light guide plate and edge-lit surface light source device using same Download PDFInfo
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- CN103080644A CN103080644A CN2011800416100A CN201180041610A CN103080644A CN 103080644 A CN103080644 A CN 103080644A CN 2011800416100 A CN2011800416100 A CN 2011800416100A CN 201180041610 A CN201180041610 A CN 201180041610A CN 103080644 A CN103080644 A CN 103080644A
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- Prior art keywords
- resin plate
- light source
- lgp
- source device
- molecular weight
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
Abstract
Disclosed is a light guide plate comprising a resin plate, which is characterized in that: the resin plate has a main surface having an area of 400,000 mm2 or more; the resin plate has a thickness of 1.5-4.0 mm; and the resin plate contains a styrene resin that has a weight average molecular weight of 200,000-400,000 and a molecular weight distribution of 2.0-4.0.
Description
Technical field
The Sielight type face light source device that the present invention relates to LGP and use it.
Background technology
The transmission image display devices such as liquid crystal indicator generally have the planar light source device as backlight.Sielight type face light source device consists of by the LGP with transparent resin plate with to the light source that the end face of resin plate is supplied with light.Reflected by the reflecting mechanism such as the dot pattern of the rear side that is located at resin plate from the light of the surface feeding sputtering of resin plate, supply with from the outgoing plane of LGP and be used for the planar light that image shows.As the resin plate that is used for LGP, be widely used the excellent acrylic resin board (for example patent documentation 1,2) of the transparency in the past.
Patent documentation 1: Japanese kokai publication hei 5-100118 communique
Patent documentation 2: Japanese kokai publication hei 5-313017 communique
Summary of the invention
Slimming in recent years and large picture along with transmission image display device need to use to have Sielight type face light source device thinner, more large-area LGP.But, if the area of LGP arrives greatly 400000mm
2More than, the level that is able to satisfy in intensity when then in the past LGP obviously is difficult to keep to a certain degree thinness.
Therefore, the purpose of this invention is to provide the high-intensity LGP with degree of enough in the Sielight type face light source device of large picture, using.
The area that the present invention relates to have first type surface is 400000mm
2The LGP of above resin plate.In the LGP that the present invention relates to, the thickness of resin plate is 1.5mm～4.0mm.In addition, resin plate comprises the phenylethylene resin series that has 200000～400000 weight average molecular weight and have 2.0～4.0 molecular weight distribution.
The LGP that the invention described above relates to is by using the phenylethylene resin series phenylethylene resin series plate that form, that have specific thickness by the weight average molecular weight with particular range and molecular weight distribution, thereby reaches enough at 400000mm
2The high strength of the degree of using in the Sielight type face light source device of above large picture.
With the light transmittance of the thickness direction of the tabular test film of the thickness with 4mm that consists of the above-mentioned phenylethylene resin series moulding of resin plate and obtain in wavelength 600nm for T600, in wavelength 365nm during for T365, preferred T600 is more than 85%, and T365/T600 is 0.90～0.99.Thus, in the planar light source device of large picture, can more easily reach sufficiently high brightness.
On the other hand, the present invention relates to a kind of Sielight type face light source device, wherein, possess: the LGP that the invention described above relates to and supply with the light source of light to the end face of the resin plate of this LGP.
According to the present invention, can provide the high-intensity LGP with degree of enough in the Sielight type face light source device of large picture, using.
Description of drawings
Fig. 1 is the cutaway view of an embodiment that expression possesses the transmission image display device of planar light source device.
The specific embodiment
Below, preferred embodiment of the present invention is elaborated.But, the invention is not restricted to following embodiment.
Fig. 1 is the cutaway view of an embodiment that expression possesses the transmission image display device of planar light source device.Transmission image display device 100 shown in Figure 1 be mainly by planar light source device 20, have the liquid crystal indicator that the liquid crystal display part 30 of liquid crystal cells consists of.The light source 3 that planar light source device 20 possesses LGP 1 with resin plate 11 and arranges along the end face S3 of resin plate 11.Resin plate 11 have outgoing plane S1 with and the back side S2 of opposition side.LGP 1 further has the reflecting part 12 that is located at back side S2 side.Liquid crystal display part 20 is located at the outgoing plane S1 side of LGP 1.
Incide resin plate 11 from the light of light source 3 irradiations from end face S3.Incide the light of resin plate 11 by mainly penetrating from outgoing plane S1 in reflecting part 12 reflections.Supply with to liquid crystal display part 30 from the light that outgoing plane S1 penetrates.
Outgoing plane S1 and back side S2 as the first type surface of resin plate 11 are rectangle (being typically rectangle), and area separately is 400000mm
2More than.For example, outgoing plane S1 and back side S2 can be the rectangles of 800mm * 500mm.
The thickness of resin plate 11 is 1.5mm～4.0mm.Has to a certain degree thickness by resin plate like this, even if 400000mm
2Above large tracts of land, distortion and the breakage of the LGP that the impact that is subject in the time of also can fully preventing from using in planar light source device causes.Consider that from same viewpoint the thickness of resin plate 11 preferably surpasses 2.0mm, more preferably more than 2.5.On the other hand, consider that from the viewpoint of the slimming of display unit the thickness of preferred resin plate 11 is little.Particularly, the thickness of resin plate 11 is preferably below the 3.7mm, more preferably below the 3.5mm.
Resin plate 11 is the phenylethylene resin series plates that formed by phenylethylene resin series.Phenylethylene resin series comprises the polymer that styrene or its simple function derivative (hereinafter referred to as " styrenic monomers ") are contained as main monomeric unit.The styrenic monomers that consists of phenylethylene resin series for example can also be used the substituted phenylethylene class except styrene.As this substituted phenylethylene class, for example can enumerate the halogenated styrenes class of chlorostyrene, bromstyrol and so on, the ring-alkylated styrenes class of vinyltoluene, AMS and so on etc.Styrenic monomers can be used separately separately, also can will be used in combination more than 2 kinds.Phenylethylene resin series can also contain other composition of the trace that mixes with its polymer.Phenylethylene resin series can be the homopolymers of styrenic monomers, also can be the copolymer of styrenic monomers and other one kind or two or more monofunctional monomer.Take the overall quality of phenylethylene resin series as benchmark, phenylethylene resin series preferably contains the above monomeric unit from styrenic monomers of 50 quality %.
With the monofunctional monomer of styrenic monomers copolymerization so long as have 1 can radical polymerization the compound of two keys get final product.This monofunctional monomer is to be selected from methacrylates such as methyl methacrylate, EMA, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, 2-Ethylhexyl Methacrylate and 2-hydroxyethyl methacrylate, the acrylate such as methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, 2-EHA and acrylic acid 2-hydroxy methacrylate, methacrylic acid, acrylic acid, and in the acrylonitrile at least a kind.Wherein, the methacrylate such as preferable methyl methyl acrylate.
From keeping sufficient intensity and the good viewpoint of extruding processability considers that the weight average molecular weight Mw that consists of the phenylethylene resin series of resin plate 11 is preferably 200000～400000, more preferably 250000～3800000.The higher limit of the weight average molecular weight of phenylethylene resin series and lower limit can be from for example selecting arbitrarily 200000,250000,280000,300000,330000,3800000 and 400000.Consider from same viewpoint, and the molecular weight distribution of phenylethylene resin series (ratio of weight average molecular weight Mw and number-average molecular weight Mn Mw/Mn) is preferably 2.0～4.0, and more preferably 2.5～3.4.The higher limit of the molecular weight distribution of phenylethylene resin series and lower limit can be from for example selecting arbitrarily 2.0,2.5,2.6,3.2,3.4,3.6 and 4.0.If weight average molecular weight and molecular weight distribution are large, when utilizing method moulding resin plates such as extruding processing, forming machine is brought large load, so the foreign matter in the forming machine etc. is sneaked in the resin plate easily.In addition, because molecular weight distribution is little, easily by grinding the end face smoothing with the resin plate after the moulding.From the Sielight type face light source device of surface feeding sputtering, the end face processing of carrying out easily large-area resin plate is particular importance at light.
Above-mentioned weight average molecular weight and molecular weight distribution are to utilize gel permeation chromatography (GPC) to measure and value that the polystyrene standard that obtains converts.
As the phenylethylene resin series that consists of resin plate 11, the light transmittance T600 that preferably this phenylethylene resin series moulding is obtained, has the thickness direction among the wavelength 600nm of tabular test film of thickness of 4mm is more than 85%, more preferably more than 87%, more preferably more than 88%.The higher limit of T600 and lower limit can be from for example selecting arbitrarily 85%, 87%, 88%, 89.9%, 90.0% and 90.1%.The light transmittance T365 of the thickness direction among the wavelength 365nm of this test film is preferably 0.90～0.99 with respect to the ratio (T365/T600) of T600.Have the transmitance that satisfies these conditions by phenylethylene resin series, can in large-area planar light source device, supply with the light of abundant brightness.Consider that from same viewpoint T365/T600 is more preferably more than 0.94, more preferably more than 0.95.The higher limit of T365/T600 and lower limit can be from for example selecting arbitrarily 0.90,0.94,0.942,0.943,0.947,0.95 and 0.99.Usually be to show equally T600 more than 85% and 0.90～0.99 T365/T600 with above-mentioned test film in the scope about 1.5～4mm at thickness with the resin plate of the individual layer that satisfies the phenylethylene resin series moulding of above-mentioned condition and obtain.
For the tabular test film (thickness 4mm) that common a large amount of phenylethylene resin series moulding of using are obtained, T365/T600 is mostly less than 0.90.As its reason, such as considering it is in liquid phase, to utilize the methods such as suspension polymerization, dispersion copolymerization method to make the starting monomer polymerization and when making phenylethylene resin series, in the phenylethylene resin series that obtains, sneak into solvent, catalyst component and other additive.Gasiform starting monomer is contacted with the catalyst of solid shape and carry out polymerization and make in the situation of phenylethylene resin series, also it is contemplated that sneaking into of catalyst component.In addition, also consider owing to a small amount of for various purposes additive that adds in the phenylethylene resin series of making descends T365.
Therefore, as phenylethylene resin series, for example, do not add the few phenylethylene resin series of amount of additive or additive after in manufacturing process, having used the phenylethylene resin series that fully cleans after being difficult to make the painted material of phenylethylene resin series as the phenylethylene resin series of additive, catalyst etc., polymerization, polymerization by choice for use, thereby can access T365/T600 at the test film of 0.90～0.95 scope.The highly purified phenylethylene resin series so as described later form with commercially available product shown in the embodiment obtains.
Resin plate 11 can also comprise other compositions such as emboliform light diffusing agent that form from the mutually different phase that contains phenylethylene resin series except phenylethylene resin series.Resin plate 11 can be made by common forming methods such as extrusion moldings.
Reflecting part 12 is the upper dot pattern that forms regulation of S2 overleaf.Reflecting part 12 for example contains emboliform smooth reflective agent and is dispersed with the adhesive of this light reflective agent.Reflecting part 12 can form by the usual ways such as pattern printing of printing ink.
The invention is not restricted to embodiment described above, can suitably change in the scope that does not break away from its purport.For example, as the reflecting mechanism of LGP 1, also can replace reflecting part 12 is set and overleaf S2 form concaveconvex shape.In addition, for example, in order to adjust bright dipping, also can form concaveconvex shape in the outgoing plane S1 of LGP 1 side.In addition, the various bloomings such as diffusion barrier, prism film, brightness raising film also can be set between LGP 1 and liquid crystal display part 30.
Embodiment
Below, expression can be used in the evaluation result of characteristic of the phenylethylene resin series of the LGP that the present invention relates to.But, be used for phenylethylene resin series of the present invention and be not limited to these.
Weight average molecular weight and molecular weight distribution
The sample that the molecular filter of the soln using 0.2 μ m that phenylethylene resin series is dissolved in THF and obtains filters and prepared to be used for to measure.Utilize this sample to carry out GPC and measure, measured weight average molecular weight (Mw) and molecular weight distribution (Mw/Mn) that polystyrene standard converts.
Light transmittance
Phenylethylene resin series is dropped into the former hopper of extruder, barrel temperature is set as 200～250 ℃ and carry out extrusion molding, obtained having the tabular test film of 4mm thickness.Use this test film, utilize the spectral transmission meter (U4000 processed of Hitachi) with integrating sphere, measured light transmittance T365 among the wavelength 365nm of thickness of slab direction and the light transmittance T600 among the wavelength 600nm.In addition, obtained the value of T365/T600 by these values.
As shown in table 1, commercially available each phenylethylene resin series (polystyrene) A, B, C all is that weight average molecular weight is 200000～400000, molecular weight distribution is 2.0～4.0.In addition, confirmed that the test film that each phenylethylene resin series moulding is obtained satisfies that T600 is more than 85%, T365/T600 is 0.90～0.99 characteristic.
[table 1]
| ? | Mw | Mw/Mn | T365 | T600 | T365/T600 |
| Phenylethylene resin series A | 280000 | 3.6 | 85.2 | 89.9 | 0.947 |
| Phenylethylene resin series B | 300000 | 2.6 | 84.8 | 90.1 | 0.942 |
| Phenylethylene resin series C | 330000 | 3.2 | 84.9 | 90.0 | 0.943 |
The GPPS processed of phenylethylene resin series B:BASF company, grade name " Polystyrol168N "
The phenylethylene resin series C:PS Japan GPPS processed of company, grade name " G9305 "
Utilize possibility on the industry
Can provide the high-intensity LGP with degree of enough in the Sielight type face light source device of large picture, using according to the present invention.
Symbol description
1 ... LGP, 3 ... light source, 11 ... resin plate, 12 ... reflecting part, 20 ... planar light source device, 30 ... liquid crystal display part, 100 ... transmission image display device (liquid crystal indicator), S1 ... outgoing plane, S2 ... the back side, S3 ... end face.
Claims (3)
1. a LGP wherein, has resin plate,
Described resin plate possesses and has 400000mm
2The first type surface of above area,
The thickness of described resin plate is 1.5mm～4.0mm,
Described resin plate comprises the phenylethylene resin series of the molecular weight distribution with 200000～400000 weight average molecular weight and 2.0～4.0.
2. LGP according to claim 1, wherein, the light transmittance of the thickness direction of the tabular test film with 4mm thickness that described phenylethylene resin series moulding is obtained in wavelength 600nm for T600, in wavelength 365nm when the T365, T600 is more than 85%, and T365/T600 is 0.90～0.99.
3. Sielight type face light source device wherein, possesses:
Claim 1 or 2 described LGPs, and
Supply with the light source of light to the end face of the described resin plate of this LGP.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-195824 | 2010-09-01 | ||
| JP2010195824A JP2012053273A (en) | 2010-09-01 | 2010-09-01 | Light guide plate and edge-lit type surface light source device using the same |
| PCT/JP2011/068068 WO2012029508A1 (en) | 2010-09-01 | 2011-08-08 | Light guide plate and edge-lit surface light source device using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103080644A true CN103080644A (en) | 2013-05-01 |
Family
ID=45772613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011800416100A Pending CN103080644A (en) | 2010-09-01 | 2011-08-08 | Light guide plate and edge-lit surface light source device using same |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2012053273A (en) |
| KR (1) | KR20140000215A (en) |
| CN (1) | CN103080644A (en) |
| TW (1) | TW201224544A (en) |
| WO (1) | WO2012029508A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6038497B2 (en) * | 2012-06-18 | 2016-12-07 | Ｐｓジャパン株式会社 | Polystyrene resin composition and light guide plate |
| CN104508357B (en) | 2012-07-27 | 2018-01-23 | 阪本顺 | Light guide plate, light supply apparatus, apparatus for manufacturing light guide plate and method for manufacturing light guide plate |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007204536A (en) * | 2006-01-31 | 2007-08-16 | Ps Japan Corp | Light guide plate |
| CN101363925A (en) * | 2007-08-09 | 2009-02-11 | 住友化学株式会社 | Light diffuser plate |
| CN101650451A (en) * | 2008-08-12 | 2010-02-17 | 住友化学株式会社 | Light conducting plate |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009283384A (en) * | 2008-05-26 | 2009-12-03 | Panasonic Corp | Laminated light guide plate, laminated diffusion plate, edge-light type backlight device, direct-down backlight device, and liquid crystal display |
| JP5279015B2 (en) * | 2008-11-20 | 2013-09-04 | 旭化成ケミカルズ株式会社 | Light guide plate |
-
2010
- 2010-09-01 JP JP2010195824A patent/JP2012053273A/en active Pending
-
2011
- 2011-08-08 KR KR1020137007874A patent/KR20140000215A/en not_active Application Discontinuation
- 2011-08-08 CN CN2011800416100A patent/CN103080644A/en active Pending
- 2011-08-08 WO PCT/JP2011/068068 patent/WO2012029508A1/en active Application Filing
- 2011-08-16 TW TW100129267A patent/TW201224544A/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007204536A (en) * | 2006-01-31 | 2007-08-16 | Ps Japan Corp | Light guide plate |
| CN101363925A (en) * | 2007-08-09 | 2009-02-11 | 住友化学株式会社 | Light diffuser plate |
| CN101650451A (en) * | 2008-08-12 | 2010-02-17 | 住友化学株式会社 | Light conducting plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012053273A (en) | 2012-03-15 |
| WO2012029508A1 (en) | 2012-03-08 |
| TW201224544A (en) | 2012-06-16 |
| KR20140000215A (en) | 2014-01-02 |
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Application publication date: 20130501 |