CN1270207C - Reflective thin sheet and back light assembly using said sheet - Google Patents
Reflective thin sheet and back light assembly using said sheet Download PDFInfo
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- CN1270207C CN1270207C CNB021306664A CN02130666A CN1270207C CN 1270207 C CN1270207 C CN 1270207C CN B021306664 A CNB021306664 A CN B021306664A CN 02130666 A CN02130666 A CN 02130666A CN 1270207 C CN1270207 C CN 1270207C
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- reflection sheet
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- absorbing 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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- 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
- 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
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Laminated Bodies (AREA)
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
Abstract
To provide a reflecting sheet capable of preventing secular deterioration such as yellowing and a back light unit capable of increasing a brightness by using the reflecting sheet and capable of preventing the secular deterioration of quality. This reflecting sheet for back light unit capable of reducing the diffusion of light beam comprises a white synthetic resin base material sheet layer and an ultraviolet absorbing layer stacked on the front surface of the base material sheet layer. The ultraviolet absorbing layer comprises a base material polymer containing ultraviolet absorbing agent or a base material polymer having ultraviolet absorbing groups connected to molecular chains. The ultraviolet absorbing layer may be formed of a base material polymer containing ultraviolet stabilizing agent or a base material polymer having ultraviolet stabilizing groups in the molecular chains.
Description
Technical field
The present invention relates to reflection sheet and backlight assembly that a kind of backlight assembly is used; This reflection sheet has the scattering of light of reduction effect; And this reflecting assembly uses this reflection sheet.
Background technology
Liquid crystal indicator is comparatively universal to make it luminous backlight from the liquid crystal back side illuminaton now; Bottom surface side device at this liquid crystal layer has back lighting devices such as edge light type, vertical-type.Be illustrated in figure 5 as general edge light type backlight assembly 40, it possesses: bar-shaped lamp 41, and it is as light source; Light guide plate 43, it is square tabular, and disposes along the end of this bar-shaped lamp 41; Otpical leaf 42, it has many pieces, and is stacked on the face side in this light guide plate 43; And reflection sheet 46, it is stacked on the rear side of light guide plate 43.Aforementioned otpical leaf 42 has specific optical properties such as refraction, diffusion respectively, particularly, for example, is disposed at the light diffusion thin slice 44 of the face side of light guide plate 43, and the beam split thin slice 45 that is disposed at the face side of light diffusion thin slice 44 promptly is.
Below describe at the function of aforementioned backlight assembly 40.At first, from the light that bar-shaped lamp 41 penetrates to light guide plate 43, reflection spot (not shown in the diagram) and each face side that can be subjected to light guide plate 43 back sides reflect, and are penetrated by light guide plate 43 surfaces then.Then, the light that is penetrated by light guide plate 43 can be injected light diffusion thin slice 44 and be spread, and is penetrated by the surface of light diffusion thin slice 44 then.Then, can inject beam split thin slice 45, and outwards penetrate with the light that is the spike distribution in nearly normal direction via spectrum part 45a by the light that light diffusion thin slice 44 penetrates; And this spectrum part 45a forms in the surface of beam split thin slice 45.As mentioned above, spread by light diffusion thin slice 44 by bar-shaped lamp 41 emitted light, again via beam split thin slice 45 being spike in nearly normal direction and distributing and to reflect, and then comprehensively shining to liquid crystal layer (not shown in the diagram) that be positioned at the top.
On the other hand, in order to be achieved as follows all purposes, and at the rear side configuration reflection sheet 46 of light guide plate 43.Aforementioned purpose refers to: under the degree that does not cause the liquid crystal panel flicker, the light that the back side scattered out from light guide plate 43 is reflected in its face side, improve brightness (reflectivity); And device, framework of preventing to be disposed at the rear side of backlight assembly 40 etc. reveal (disguise).
So far, the aforementioned reflection sheet 46 of previous form adopts as described below: (a) in plastic thin slice, Chinese whites such as its titanium dioxide are dispersion; (b) in plastic thin slice, it is used for making the bubble of light scattering to be dispersion; (c) surface of thin slice forms clathrate.
Comprise the backlight assembly 40 of the reflection sheet 46 of aforementioned previous form as use, then can produce following phenomenon: reflection sheet 46 can produce the time dependent yellows, thereby causes making picture backlight Huang and make the deterioration of quality such as brightness variation partially.
Summary of the invention
Because aforesaid drawbacks, purpose of the present invention is for providing: reflection sheet, this reflection sheet can not cause time dependent deteriorations such as yellow; And backlight assembly, it uses this reflection sheet to improve brightness and prevents quality badness by the time.
For addressing the above problem, the present inventor finding through after the careful research, causes the main cause of the time dependent deteriorations such as yellow of aforementioned reflection sheet to be the ultraviolet ray of trace, and ultraviolet ray that should trace is contained in the light that fluorescent tube sends.
The invention is characterized in for addressing the above problem to research and develop: the reflection sheet that its reflection sheet is used for the backlight assembly that can reduce light scatter, and this reflection sheet comprises: white plastic substrate sheet layer; And UV-absorbing layer, its face side institute lamination in this substrate sheet layer forms.
This reflection sheet has following effect: its UV-absorbing layer can absorb the ultraviolet ray of trace, and prevents time dependent deterioration such as aforementioned yellow; And this UV-absorbing layer is stacked on the face side of this substrate sheet layer; The ultraviolet ray of this trace is contained in the light that fluorescent tube sends.
Aforementioned UV-absorbing layer can comprise: substrate polymer; And ultraviolet light absorber, it is contained in this substrate polymer.By this mechanism, UV-absorbing layer can utilize it ultraviolet light absorber that possesses effectively to bring into play the UVA function.Therefore in addition, be protected, when deserve the preservation haulage of reflection sheet and when carrying out the assembling operation of backlight assembly or during use, can prevent the damaged of ultraviolet light absorber owing to ultraviolet light absorber is contained in the substrate polymer.
The amount to substrate polymer of aforementioned ultraviolet light absorber is being good below 10 percentage by weights more than 0.1 percentage by weight.Mix ultraviolet light absorber at substrate polymer with aforementioned deal, then can effectively bring into play aforementioned yellow and prevent effect reflection sheet.And this substrate polymer is used for constituting UV-absorbing layer.
The material of aforementioned ultraviolet light absorber can be selected one or more and use from following each agent group, for example, salicylic acid is that ultraviolet light absorber, benzophenone series ultraviolet light absorber, benzotriazole are that ultraviolet light absorber, cyanacrylate are ultraviolet light absorber.Aforementioned each agent possesses good ultraviolet line absorption function and has good intermiscibility and thermostability with substrate polymer, therefore is suitable for preventing the light deterioration and the yellow of reflection sheet.
In addition, aforementioned UV-absorbing layer is good to comprise substrate polymer, and this substrate polymer in molecule lock in conjunction with the UVA base.By this mechanism, the UVA base that combines with the molecule of substrate polymer lock can absorb ultraviolet ray, so can prevent time dependent deterioration such as aforementioned yellow.In the molecule lock of substrate polymer, also combine the functional group, therefore can further improve the UVA function; And the functional group has the UVA function.
In addition, in aforementioned UV-absorbing layer, be good to comprise ultraviolet stabilization agent or following substrate polymer; This substrate polymer is stable basic in conjunction with ultraviolet ray in the molecule lock.By this mechanism, ultraviolet stabilization agent in the UV-absorbing layer or the stable base of ultraviolet ray can make deactivations (decompose, catch) such as free radical that ultraviolet ray produced, active oxygen, and even thereby reduce the deterioration of UV-absorbing layer reflection sheet.
The stable base of aforementioned ultraviolet stabilization agent or ultraviolet ray is that ultraviolet stabilization agent, the obstacle hydramine system stable base of ultraviolet ray are for good to use the obstacle hydramine.This obstacle hydramine is that ultraviolet stabilization agent, stable base possess the stable function of highly aforementioned ultraviolet ray, and the continuation height, therefore can further improve the permanance and the weather-proof surname of reflection sheet.
In addition, deserving aspect the reflection sheet, is good with the particle that further disperses to contain soft elasticity macromolecular material system in its UV-absorbing layer.By this mechanism, can form granular soft convex shaped part on the surface of deserving reflection sheet, therefore, on backlight assembly, deserve reflection sheet and be diffusing point-like with aforementioned granular soft convex shaped part and the back side of light guide plate and contact, so can prevent injury the light guide plate back side; And this light guide plate is arranged at the face side of reflection sheet.In addition, in UV-absorbing layer, be the particle that disperses to contain and have the function of giving light diffusing, and the light diffusing of UV-absorbing layer can improve the reflectivity and the disguise of reflection sheet.
Aforementioned particles is good to adopt the lower and solvent resistance of glass transfer temperature, the good flexible polyurethane grain of thermotolerance.
On the other hand, deserving further to disperse to contain bubble in its UV-absorbing layer on the reflection sheet.By this mechanism, the bubble that is scattered in UV-absorbing layer can form trickle soft convex shaped part on the surface.The same with the aforementioned particles of disperseing to contain, it has the function that prevents to the injury at the light guide plate back side, and can improve reflectivity and disguise.
In addition, deserve reflection sheet and comprise high hidden layer, and it is stacked on the lamellose rear side of aforementioned substrates.This high hidden layer can utilize the coating that contains Chinese white to form to be coated with worker's mode.By this mechanism, high hidden layer can further improve the reflectivity and the disguise of reflection sheet; And this high hidden layer is stacked on the lamellose rear side of aforementioned substrates.
The backlight assembly that liquid crystal indicator is used possesses: (a) wire fluorescent tube; (b) light guide plate, it is along the face side setting of this fluorescent tube, is used for light guide surface side that this fluorescent tube is sent; (c) otpical leaf, the face side that it is arranged at this light guide plate is used for a light summary that is penetrated by aforementioned light guide plate spread fifty-fifty and make it reflecting towards the normal direction side; And (d) aforementioned reflection sheet of the present invention, it is disposed at the rear side of aforementioned light guide plate.As previously mentioned,, it can bring into play the function that prevents of time dependent yellow because of deserving reflection sheet, thus can prevent the phenomenon of inclined to one side Huang of the time dependent of picture backlight and brightness variation, and improve quality.In addition, possesses the preventing property that light guide plate is injured owing to deserve reflection sheet, so can prevent the phenomenon of brightness variation and brightness disproportionation; And aforementioned phenomenon by the light guide plate back side be hurt the institute cause.And, the operation that also can improve aspects such as assembling.
Description of drawings
Fig. 1: with a kind of mode sectional drawing of implementing the relevant reflection sheet of kenel of the present invention.
Fig. 2: the mode sectional drawing of reflection sheet, and the enforcement kenel of this reflection sheet is different with Fig. 1.
Fig. 3: the mode sectional drawing of reflection sheet, and the enforcement kenel of this reflection sheet is different with Fig. 1, Fig. 2.
Fig. 4: the mode sectional drawing of reflection sheet, and the enforcement kenel of this reflection sheet and Fig. 1, Fig. 2, Fig. 3 are different.
Fig. 5: the mode sectional drawing of the backlight assembly of general edge light type.
Embodiment
Below with reference to suitable accompanying drawing, explain orally at enforcement kenel of the present invention.
The reflection sheet 1 of Fig. 1 comprises: substrate sheet layer 2; And UV-absorbing layer 3, it is stacked on this substrate sheet layer 2 surfaces.
This substrate sheet layer 2 is formed by white synthetic resin.And should white synthetic resin as previously mentioned, include Chinese white and in the micro air bubble of dispersion is arranged, the synthetic resin user who is suitable as this substrate sheet layer 2 is not particularly limited, for example, following listed person all can use: polyethylene terephthalate, poly-to bitter edible plant dioctyl phthalate second diester, acryl resin, polyester acid esters, polystyrene, polyalkenes hydrocarbon, cellulose acetate, weatherability polyvinyl chloride etc.; Wherein, be good especially with terephthaldehyde's tygon of excellent heat resistance.
The thickness of this substrate sheet layer 2 is not particularly limited, and for example, can be located at below the above 250 μ m of 50 μ m.As the thickness of substrate sheet layer 2 during less than aforementioned range, then when being coated with the worker at the resin combination that is used to form UV-absorbing layer 3, the phenomenon that may bend easily then.Relative, during greater than aforementioned range, then may make the brightness variation of liquid crystal indicator as the thickness of substrate sheet layer 2; And the thickness of backlight assembly is become greatly, this is against the demand of the thin typeization of liquid crystal indicator.
In addition, the same with the reflection sheet of previous form aspect the Chinese white that comprises, particularly, can use titanium dioxide (titanium white), lead monoxide (Zinc Oxide), ceruse (white lead), barium sulphate, lime carbonate (Bai Ya) etc.Wherein, be good particularly with the titanium dioxide that improves disguised effect excellence.In addition, aspect the bubble that disperses to contain, then also the reflection sheet with previous form is identical.
UV-absorbing layer 3 comprises: substrate polymer 4; And ultraviolet light absorber, it is contained in the substrate polymer 4.In addition, the thickness of this UV-absorbing layer 3 is not particularly limited, for example, and following the getting final product of the above 30 μ m of 3 μ m.
These substrate polymer 4 employed materials there is no particular restriction, can use following institute to list: for example, acryl resin, polyurethane, polyester, fluorine resin, silicon are resin, poly-imines amine, epoxy resin etc.In this substrate polymer 4, also can mix plasticizer, stabilization agent, deterioration preventing agent, spreading agent, charged preventor etc.Generally speaking, this substrate polymer 4 is transparent, but for substrate sheet layer 2 as, making it to possess has reflectivity and disguise, the mode that Chinese white or bubble are disperseed realizes.
Contained ultraviolet light absorber is used for absorbing ultraviolet ray in the UV-absorbing layer 3, and is heat energy with it efficient transformation; And the material of this ultraviolet light absorber there is no particular restriction so long as the compound of light tool stability is got final product, so use the material known to general to get final product.Wherein, to use the described person of following row: possess good ultraviolet line absorption function and have good intermiscibility person with aforementioned substrates polymkeric substance 4 for good, for example, can stabilize the salicylic acid that exists in substrate polymer 4 is that ultraviolet light absorber, benzophenone series ultraviolet light absorber, benzotriazole are that ultraviolet light absorber, cyanacrylate are that ultraviolet light absorber all is well suited for; Can select one or more from aforementioned each agent group uses.
Aspect UV-absorbing layer 3, aforementioned ultraviolet light absorber the following of substrate polymer 4 amounts is limited to 0.1% weight ratio, and even be good especially with 1% weight ratio, 3% weight ratio.And the aforementioned amount of ultraviolet light absorber on be limited to 10% weight ratio, and even be good especially with 8% weight ratio, 5% weight ratio.Its reason is, as ultraviolet light absorber to substrate polymer 4 combined amount less than aforementioned down in limited time, then can't make reflection sheet 1 effectively performance to the effect that prevents of aforementioned yellow etc.; Relative, surpass aforementioned going up in limited time as the combined amount of ultraviolet light absorber, then can produce harmful effects to substrate polymer 4, cause the deterioration of the intensity, permanance etc. of UV-absorbing layer 3.And aforementioned substrates polymkeric substance 4 is used to constitute UV-absorbing layer.
Aspect the manufacture method of deserving reflection sheet 1, two kinds of method for makings of following (a) and (b) can be arranged.(a) method for making comprises following operation: adjust operation, it mixes the resin combination that ultraviolet light absorber is adjusted UV-absorbing layer 3 usefulness in substrate polymer 4; And forming operation, it utilizes method such as Tu Gong that this resin combination is carried out lamination on the surface of substrate sheet layer 2, forms UV-absorbing layer 3.And (b) method for making comprises following operation: lamination procedure, and it utilizes methods such as Tu Gong that resin combination is carried out lamination on the surface of substrate sheet layer 2, and this resin combination is used to constitute substrate polymer 4; And forming operation, it soaks ultraviolet light absorber to be contained in and forms UV-absorbing layer 3 in the lamination, and this is stacked in this operation and forms.
In deserving reflection sheet 1, white plastic substrate sheet layer 2 can be brought into play the reflectivity identical with the reflection sheet of previous form with disguised; UV-absorbing layer 3 can absorb the ultraviolet ray of sending from fluorescent tube in addition, and prevent yellow etc. through the time degradation phenomena; And this UV-absorbing layer 3 is stacked on substrate sheet layer 2 surface.In other words, use the same substrate sheet layer 2 of reflection sheet with previous form, and resin combination carried out lamination on its surface, then can make easily and positively allow reflection sheet 1 bring into play to through the time yellow prevent effect.
In addition, the also available following substrate polymer of UV-absorbing layer 3 forms: this substrate polymer contains UVA base (for example, " UdableUV " series of Japanese catalyst company etc.) in molecule lock.Use the aforementioned substrates polymkeric substance as UV-absorbing layer 3, then because the oozing out etc. of ultraviolet light absorber, so can prevent the deterioration of UVA function; And this substrate polymer contains the UVA base in the molecule lock.Moreover, in the substrate polymer that combines the UVA base,, therefore can more improve the UVA layer function of UV-absorbing layer 3 owing to also comprise the event of UVA base.
The reflection sheet 11 of Fig. 2 is the same with the reflection sheet 1 of earlier figures 1, comprises: substrate sheet layer 2; And UV-absorbing layer 12, it is stacked on the surface of this substrate sheet layer 2, and this substrate sheet layer 2 is identical with the reflection sheet 1 of earlier figures 1.
This UV-absorbing layer 12 is the same with the UV-absorbing layer 3 of aforementioned reflection sheet 1, comprises: substrate polymer 4; And ultraviolet light absorber, it is contained in this substrate polymer 4.This substrate polymer 4, ultraviolet light absorber and combined amount thereof are identical with aforementioned reflection sheet 1.Deserve UV-absorbing layer 12 and in substrate polymer 4, further disperse to contain the particle 13 of soft elasticity macromolecular material system.Because the upper end of this particle 13 protrudes from the outside of substrate polymer 4, therefore form the soft convex shaped part 14 of smooth curved on the surface of deserving reflection sheet 1.On backlight assembly, deserving reflection sheet 1 is soft convex shaped part 14, and it presents the point-like contact of loosing to light guide plate, so can reduce to cause the injury at the light guide plate back side; And this light guide plate is disposed at the face side of reflection sheet 11.
The lower limit of the surface roughness of this UV-absorbing layer 12 (Ra) is with 5 μ m, and especially 7 μ m to 9 μ m are good.And the upper limit of aforementioned surfaces rugosity (Ra) is with 20 μ m, and especially 17 μ m to 14 μ m are good.Its reason is, as before, light guide plate presented the point-like contact of loosing to prevent the effect of light guide plate back side injury as the surface roughness (Ra) of UV-absorbing layer 12 down in limited time less than aforementioned, and difficulty just becomes.Relative, surpass aforementioned going up in limited time as surface roughness (Ra), can may cause injury because of thicker convex shaped part 14 on the contrary to the light guide plate back side.The incision value of aforesaid " surface roughness (Ra) " is 8mm, and evaluation length is 40mm.
Particularly, low following being limited to-100 of this soft elasticity high polymer material glass transfer temperature ℃ is good with-80 ℃ to-60 ℃ especially; And be limited to 30 ℃ on it, be good especially with 25 ℃ to 20 ℃; Its reason is, surpasses aforementioned going up in limited time as the glass transfer temperature of the soft elasticity macromolecular material that constitutes particle 13, and the hardness of then deserving the convex shaped part 14 on reflection sheet 11 surfaces becomes big, can't bring into play the effect that prevents injury that the light guide plate back side is caused.Relative, to prescribe a time limit down less than aforementioned as the glass transfer temperature of deserving soft elasticity macromolecular material, the convex shaped part 14 that deserves reflection sheet 11 surfaces can be crushed, and then light guide plate is presented the point-like contact of loosing and just can't bring into play with the effect that prevents the injury of the light guide plate back side.
The soft elasticity macromolecular material that is used for particle 13 can use following listed, for example, and polyurethane, silica gel, polystyrene, thermoplasticity polyester etc.Wherein, based on solvent resistance, stable on heating consideration, be good with the flexible polyurethane grain.
The following 3 μ m that are limited to of the mean grain size of particle 13 are good with 5 μ m to 7 μ m especially.And be limited to 40 μ m under it, be good especially with 30 μ m to 20 μ m.Its reason is, less than aforementioned lower limit, then particle 13 forms convex shaped part 14 with regard to being difficult to protrude from the substrate polymer 4, and the surface roughness of UV-absorbing layer 12 (Ra) can't maintain within the aforementioned range as particle 13d mean grain size.Relative, aforementioned above the aforementioned upper limit as the mean grain size of particle 13, then the surface roughness of UV-absorbing layer 12 (Ra) surpasses aforementioned range, its preventing property of injury reduction, and be difficult to form UV-absorbing layer 12 with the worker's mode that is coated with of resin combination.
Be that the lower limit of the combined amount of particle 13 is good with 0.1 under 100 the situation with respect to the polymkeric substance of substrate polymer 4, especially 5 to 10 is good.On the other hand, be limited to 500 on the combined amount of aforementioned particles 13, especially 300 to 100 is good, and aforementioned numerical value representative person is a weight ratio.The reason of setting this numerical value is, when the combined amount of particle 13 does not reach under the situation of aforementioned lower limit, then the surface roughness of UV-absorbing layer 12 (Ra) can't maintain within the aforementioned range; Relative, as surpassing the aforementioned upper limit, then be difficult to form UV-absorbing layer 12 with the worker's mode that is coated with of resin combination.
The manufacture method of deserving reflection sheet 11 comprises following operation basically: adjust operation, it mixes ultraviolet light absorber and particle 13 in substrate polymer 4, adjust the resin combination of UV-absorbing layer 12 usefulness; And forming operation, it utilizes method such as Tu Gong that this resin combination is carried out lamination on the surface of substrate sheet layer 2, forms UV-absorbing layer 12.
The same with aforementioned reflection sheet 1, in deserving reflection sheet 11, white plastic substrate sheet 2 can be brought into play reflectivity identical with the reflection sheet of previous form and disguise; And, therefore can absorb ultraviolet ray from fluorescent tube because the face side lamination of substrate sheet 2 UV-absorbing layer 12, prevent time dependent deteriorations such as yellow.Moreover, in deserving reflection sheet 11, because there is convex shaped part 14 on UV-absorbing layer 12 surfaces, so can prevent from the back side that is disposed at the light guide plate of showing side is damaged.Moreover, deserve reflection sheet 11 because the particle 13 of UV-absorbing layer 12 forms concavo-convexly on the surface, therefore can improve reflectivity to face side, and even disguised.
The reflection sheet 21 of Fig. 3 is the same with the reflection sheet 1 of earlier figures 1, comprises: substrate sheet layer 2; And UV-absorbing layer 22, it is the surface that is stacked on this substrate sheet layer 2.This substrate sheet layer 2 is identical with aforementioned reflection sheet 1.
UV-absorbing layer 22 is the same with the UV-absorbing layer 3 of aforementioned reflection sheet 1, comprises: substrate polymer 4; And ultraviolet light absorber, it is contained in this substrate polymer 4; More disperse to contain bubble 23 in this external this substrate polymer 4.Because the dispersion of this bubble 23, convex shaped part 24 forms so that the even shape of summary is most from the teeth outwards.Be positioned at the convex shaped part 24 that deserves reflection sheet 21 surfaces because of include bubble 23 so, so have elastic force, soft and be the smooth curved shape.On backlight assembly, deserving reflection sheet 21 is soft convex shaped part 24, and it presents the point-like contact of loosing to light guide plate, so can reduce to cause the injury at the light guide plate back side; And this light guide plate is disposed at the face side of reflection sheet 21.In addition, the surface roughness of this UV-absorbing layer 22 (Ra) is identical with the reflection sheet 11 of earlier figures 2.
This bubble 23 is present in the small part that contains certain gas in the substrate polymer 4, and there is no particular restriction for its shape, and for example, spherical, granular, polyhedral, the flat sugared shape of gold, free shape, spindle shape etc. can.But can promote concealed reason based on soft convex shaped part 14 of easy formation and good light diffusivity, the shape of bubble 23 is good to be spherical separated foam.Bubble 23 is present in the inside of substrate polymer 4 in principle, but also can there be open bubble in the surface of substrate polymer 4, and this bubble is opened on this surface.This open bubble can promote the formation and the light diffusing of convex shaped part 24.
The contained gas of bubble 23 decides according to the formation method of bubble 23, there is no particular determination.For example, as use the situation of gas-development agent described later,, can fill air, nitrogen gas, carbon dioxide, amine gas gas etc. according to the kind of gas-development agent.
The following 0.5 μ m that is limited to of the mean diameter of bubble 23 is good with 1 μ m to 5 μ m especially.And its mean diameter on be limited to 50 μ m, be good especially with 40 μ m to 30 μ m.Its reason is, as the mean diameter of bubble 23 less than aforementioned down in limited time, then be difficult to form convex shaped part 24, and the surface roughness of UV-absorbing layer 22 (Ra) is difficult to be maintained at aforementioned range; Relative, surpass aforementioned going up in limited time as mean diameter, then can make the intensity variation of UV-absorbing layer 22.
The following 1vol% that is limited to, the especially 10vol% to 20vol% of the volume ratio of 23 pairs of substrate polymers 4 of bubble are good; And its volume ratio on be limited to 80vol%, especially 70vol% to 60vol% is good.Its reason is, then is difficult to maintain aforementioned range because of convex shaped part 24 makes the surface roughness (Ra) of UV-absorbing layer 22 down in limited time less than aforementioned as the volume ratio of bubble 23, and promotes concealed effect also not good because of light diffusing; And relative, surpass aforementioned going up in limited time as the volume ratio of bubble 23, then can make all variation of the intensity of UV-absorbing layer 22 and permanance.
Aspect the manufacture method of deserving reflection sheet 21, basically comprise following operation: adjust operation, it adds gas-development agent and ultraviolet light absorber and mixes and stir in resin combination (it is main polymkeric substance with thermosetting resin), the resin combination of UV-absorbing layer 22 usefulness is adjusted, and this resin combination constitutes substrate polymer 4; The coating operation, it implements coating with this resin combination on the surface of substrate sheet layer 2; And lamination procedure, its UV-absorbing layer 22 is carried out lamination.In this lamination procedure, when making substrate polymer 4 thermmohardenings, allow the gas-development agent foaming that bubble 23 is scattered in the UV-absorbing layer 22 with type of heating.
The same with aforementioned reflection sheet 1, in deserving reflection sheet 21, white plastic substrate sheet 2 can be brought into play reflectivity identical with the reflection sheet of previous form and disguise; And, therefore can absorb ultraviolet ray from fluorescent tube because the surperficial lamination of substrate sheet 2 UV-absorbing layer 22, prevent time dependent deteriorations such as yellow.Moreover, in deserving reflection sheet 21, because there is convex shaped part 14 on UV-absorbing layer 22 surfaces, so can prevent from the back side of the light guide plate that is disposed at face side is damaged.Moreover, deserve reflection sheet 21 because the bubble 23 of UV-absorbing layer 22 forms concavo-convexly on the surface, therefore can improve reflectivity to face side, and disguised.
The reflection sheet 31 of Fig. 4 is the same with the reflection sheet 11 of earlier figures 2, comprises: substrate sheet layer 2; And UV-absorbing layer 12, it is stacked on the surface of this substrate sheet layer 2.Therefore in presents, give the same components symbol respectively, but omit its explanation.Moreover, deserving also further to comprise high hidden layer 32 aspect the reflection sheet 21, it is stacked on the back side of substrate sheet layer 2.
High hidden layer 32 possesses the reflectivity of raising and concealed effect, and particularly, it can utilize the coating 34 that contains Chinese white 33 to implement to be coated with the worker at the back side of substrate sheet layer 2 and form.Moreover these high hidden layer 32 used coating 34 there is no particular determination, so long as the general user of institute gets final product.In addition, aspect Chinese white 33, do not have particular determination yet, use identical with contained Chinese white in the aforementioned substrates lamella 2.
The lower limit to the combined amount of the solid of coating 34 of Chinese white 33 is good with 70 percentage by weights, as is that 80 percentage by weights are then better.On the other hand, the upper limit of aforementioned combined amount is good with 95 percentage by weights, as is that 90 percentage by weights are then better.Its reason is to prescribe a time limit aforementioned reflectivity and concealed deleterious that then high hidden layer 32 is improved as the combined amount of Chinese white 33 down less than aforementioned; Relative, prescribe a time limit above aforementioned going up as the combined amount of Chinese white 33, then can make the work that is coated with of coating 34 already become difficult.
The following 1g/m of being limited to that is coated with worker's amount (converting) of coating 34 with solid
2, 5g/m especially
2And even 10g/m
2For good.On the other hand, the aforementioned worker of being coated with amount (converting) with solid on be limited to 50g/m
2, 45g/m especially
2And even 40g/m
2For good.Its reason is, as the worker's amount that is coated with of coating 34 as less than aforementioned lower limit, and aforementioned reflectivity and concealed deleterious that then high hidden layer 32 is improved; Relative, as the worker's amount that is coated with of coating 34 as surpass the aforementioned upper limit, it is big that the thickness of then high hidden layer 32 becomes, and the thin type demand of this and backlight assembly runs in the opposite direction, and may reduce the intensity of high hidden layer 32.
The particle diameter of Chinese white 33 (mean particle diameter) to be being good below the 30 μ m more than the 100nm, as be more than the 200nm 20 μ m with next even more ideal.Its reason is, as the particle diameter of Chinese white 33 less than aforementioned down in limited time, then be difficult to bring into play aforementioned disguised effect; Relative, when surpassing aforementioned range, then be difficult in coating 34, evenly disperse, and make the back side chap of deserving reflection sheet 31 as the particle diameter of Chinese white 33.
Deserve the manufacture method of reflection sheet 31, comprise basically: adjust operation, its ultraviolet light absorber and particle 13 are mixed in the substrate polymer 4, and the resin combination of UV-absorbing layer 12 usefulness is adjusted; Form operation, its this resin combination is stacked on the surface of substrate sheet layer 2, forms UV-absorbing layer 12; Mixed processes, its Chinese white 33 is mixed in the coating 34; Lamination procedure, its coating 34 are coated with the worker high hidden layer 32 are carried out lamination at the back side of substrate sheet layer 2.
The same with aforementioned reflection sheet 1, in deserving reflection sheet 31, white plastic substrate sheet 2 can be brought into play reflectivity identical with the reflection sheet of previous form and disguise; And, therefore, can prevent time dependent deteriorations such as yellow because the surperficial lamination of substrate sheet 2 UV-absorbing layer 12.Moreover, the same with aforementioned reflection sheet 11, owing on the UV-absorbing layer 12 particle 13 is arranged, so can prevent from the back side of the light guide plate that is disposed at face side is damaged.In addition, the light diffusing of the concavo-convex and particle 13 of 12 of UV-absorbing layer can improve reflectivity and the disguise to face side.In deserving reflection sheet 31, the high hidden layer 32 at its substrate sheet 2 back sides can further improve reflectivity and disguise.
Therefore, on edge light type backlight assembly 40 as shown in Figure 5, reflection sheet 46 as use aforementioned reflection sheet 1,11,21,31 then has deterioration preventing effect to aforementioned yellow etc. owing to deserve reflection sheet 1 grade, therefore can prevent the phenomenon of inclined to one side Huang of picture backlight and brightness variation.Particularly use the surface that the situation of the reflection sheet 11,21,31 of soft convex shaped part 14,24 is arranged, have preventing property, therefore can prevent the brightness disproportionation phenomenon that causes because of the injury of light guide plate 43 back sides aforementioned injury owing to deserve reflection sheet 11 grades; In addition, the assembling operation of backlight assembly 40 also becomes and is easier to.Moreover, as using rear side the reflection sheet 31 of high hidden layer 32 is arranged, then because of high hidden layer 32 has highly concealed type and reflectivity, thus can lower from the light losing of rear side institute bulk storage, and raising brightness.And, can prevent that the framework that is disposed at rear side from revealing in picture, and help to prevent the brightness disproportionation phenomenon.
In addition, reflection sheet of the present invention is not limited to aforementioned enforcement kenel.For example, do not possess UV-absorbing layer 3,12,22, and the reflection sheet that in resin, contains ultraviolet light absorber also can, it can bring into play the deterioration preventing effect to yellow etc. too.And aforementioned UV-absorbing layer contains ultraviolet light absorber.Aforementioned resin is used to constitute substrate sheet layer 2.
In addition, the also available following substrate polymer 4 of UV-absorbing layer forms: this substrate polymer 4 contains ultraviolet stabilization agent; Or this substrate polymer 4 is stable basic in conjunction with ultraviolet ray in the molecule lock.Because the cause of this ultraviolet ray stabilization agent or the stable base of ultraviolet ray, can make the free radical that produces because of ultraviolet ray, active oxygen etc. become deactivation, and even therefore can improve the ultraviolet stability, weatherability etc. of this reflection sheet of UV-absorbing layer.This ultraviolet ray stabilization agent or ultraviolet ray stable basic aspect, being fit to use the obstacle hydramine is ultraviolet stabilization agent, the stable base of obstacle hydramine system ultraviolet ray.In addition, UV-absorbing layer also can comprise this ultraviolet ray stabilization agent or the stable base of ultraviolet ray and aforementioned ultraviolet light absorber or the stable base of ultraviolet ray simultaneously; Having aforementioned person simultaneously can further improve ultraviolet deterioration preventing and weatherability.
Claims (11)
1. a reflection sheet is the reflection sheet that backlight assembly is used, and it can reduce the scattering of light; It is characterized in that, comprise:
The substrate sheet layer, it comprises white synthetic resin; And
UV-absorbing layer, it is laminated in the face side of this substrate sheet layer, and this UV-absorbing layer disperses to contain the particle of soft elasticity macromolecular material system.
2. reflection sheet as claimed in claim 1 is characterized in that: aforementioned UV-absorbing layer comprises:
Substrate polymer; And
Ultraviolet light absorber, it is contained in this substrate polymer.
3. reflection sheet as claimed in claim 2 is characterized in that: the amount to substrate polymer of aforementioned ultraviolet light absorber is more than 0.1 percentage by weight below 10 percentage by weights.
4. reflection sheet as claimed in claim 2 is characterized in that: the material of aforementioned ultraviolet light absorber can be selected one or more and use from following each agent group: salicylic acid is that ultraviolet light absorber, benzophenone series ultraviolet light absorber, benzotriazole are that ultraviolet light absorber, cyanacrylate are ultraviolet light absorber.
5. reflection sheet as claimed in claim 1 is characterized in that: aforementioned ultraviolet light absorber comprises substrate polymer, and is combined with the UVA base in the molecule of this substrate polymer lock.
6. reflection sheet as claimed in claim 1 is characterized in that: aforementioned UV-absorbing layer comprises ultraviolet stabilization agent or following substrate polymer; This substrate polymer is combined with the stable base of ultraviolet ray in the molecule lock.
7. reflection sheet as claimed in claim 6 is characterized in that: it is ultraviolet stabilization agent, the stable base of obstacle hydramine system ultraviolet ray that the stable base of aforementioned ultraviolet stabilization agent or ultraviolet ray uses the obstacle hydramine.
8. reflection sheet as claimed in claim 1 is characterized in that: aforementioned particles flexible polyurethane grain.
9. reflection sheet as claimed in claim 1 is characterized in that: also more comprise high hidden layer, it is stacked on the lamellose rear side of aforementioned substrates; And this high hidden layer is coated with the worker with the coating that contains Chinese white and forms.
10. reflection sheet as claimed in claim 1 is characterized in that: this UV-absorbing layer disperses to contain bubble.
11. the backlight assembly that liquid crystal indicator is used, it comprises:
The wire fluorescent tube;
Light guide plate, it is used for the light guide surface side that this fluorescent tube is sent along this fluorescent tube configuration;
Otpical leaf, it is used for the emitted light of aforementioned light guide plate along the configuration of face side of this light guide plate, spreads and reflects towards the normal direction side in the even mode of summary;
Reflection sheet, the face side that it is disposed at aforementioned light guide plate has the light scatter of attenuating function;
Aforementioned reflection sheet comprises: the substrate sheet layer, and it comprises white synthetic resin; And UV-absorbing layer, it is stacked on the face side of this substrate sheet layer, and this UV-absorbing layer disperses to contain the particle of soft elasticity macromolecular material system.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001286897 | 2001-09-20 | ||
| JP2001286897A JP4766805B2 (en) | 2001-09-20 | 2001-09-20 | Reflective sheet and backlight unit using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1409160A CN1409160A (en) | 2003-04-09 |
| CN1270207C true CN1270207C (en) | 2006-08-16 |
Family
ID=19109793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021306664A Expired - Fee Related CN1270207C (en) | 2001-09-20 | 2002-09-16 | Reflective thin sheet and back light assembly using said sheet |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4766805B2 (en) |
| KR (1) | KR100523204B1 (en) |
| CN (1) | CN1270207C (en) |
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|---|---|---|---|---|
| EP1619524A4 (en) * | 2003-04-28 | 2009-05-20 | Takiron Co | Electromagnetic-shielding light diffusion sheet |
| US7674506B2 (en) * | 2003-06-17 | 2010-03-09 | Teijin Chemicals, Ltd. | Direct back light type liquid crystal display and light diffuse plate |
| US20060159926A1 (en) | 2003-07-18 | 2006-07-20 | Idemitsu Kosan Co., Ltd. | Light refection sheet, process for producing the same and molding thereof |
| JP2005234521A (en) * | 2004-01-20 | 2005-09-02 | Teijin Chem Ltd | Optical diffusion plate for direct backlight made of polycarbonate resin |
| JP4548007B2 (en) * | 2004-06-14 | 2010-09-22 | パナソニック電工株式会社 | lighting equipment |
| TWI317746B (en) * | 2004-07-02 | 2009-12-01 | Eternal Chemical Co Ltd | Optical film capable of absorbing ultraviolet light |
| TWI352105B (en) * | 2004-07-26 | 2011-11-11 | Eternal Chemical Co Ltd | Optical film resistant to uv light |
| WO2006031043A1 (en) * | 2004-09-13 | 2006-03-23 | Skc Co., Ltd. | Reflection sheet and backlight unit employing the same |
| KR100719482B1 (en) * | 2004-09-13 | 2007-05-18 | 에스케이씨 주식회사 | Reflection sheets and back-light units employing the same |
| CN100401155C (en) * | 2005-03-11 | 2008-07-09 | 奇菱科技股份有限公司 | Box of backlight module |
| KR100864202B1 (en) * | 2005-07-13 | 2008-10-17 | 주식회사 코오롱 | Reflection sheet |
| KR100864201B1 (en) | 2005-09-14 | 2008-10-17 | 주식회사 코오롱 | Reflection sheet |
| JP2008065298A (en) * | 2006-08-10 | 2008-03-21 | Furukawa Electric Co Ltd:The | Antiglare film, its manufacturing method and polarizing plate for display |
| CN102269831B (en) * | 2006-10-27 | 2013-09-18 | 东丽株式会社 | White polyester film for light reflective plate |
| KR20120021107A (en) * | 2010-08-31 | 2012-03-08 | 엘지디스플레이 주식회사 | Reflecting sheet and method for fabricating the same |
| KR101870864B1 (en) | 2011-01-17 | 2018-06-26 | 삼성디스플레이 주식회사 | Display Module |
| JP2012242755A (en) * | 2011-05-23 | 2012-12-10 | Keiwa Inc | Reflection sheet and backlight unit |
| JP2013210493A (en) * | 2012-03-30 | 2013-10-10 | Furukawa Electric Co Ltd:The | Light reflecting member and manufacturing method thereof |
| CN103697415A (en) * | 2013-12-19 | 2014-04-02 | 四川绵阳岷山实业集团有限公司 | Integral LED (Light Emitting Diode) backlight optical composition plate and manufacturing method thereof |
| EP3185071B1 (en) | 2015-12-23 | 2019-10-09 | Samsung Electronics Co., Ltd. | Display apparatus |
| CN105403938B (en) * | 2015-12-25 | 2018-06-19 | 巨洋神州（苏州）数字技术有限公司 | A kind of optical extinction reflector plate and back-projection system |
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| JPH07110477A (en) * | 1993-10-14 | 1995-04-25 | Casio Comput Co Ltd | Reflecting plate for liquid crystal element |
| JPH11149816A (en) * | 1993-11-18 | 1999-06-02 | Mitsui Chem Inc | Light reflector |
| JPH07161216A (en) * | 1993-12-02 | 1995-06-23 | Lintec Corp | Reflecting sheet for surface light source body and surface light source body |
| JPH07179046A (en) * | 1993-12-21 | 1995-07-18 | Ricoh Co Ltd | Thermal recording material |
| JP3485613B2 (en) * | 1994-01-07 | 2004-01-13 | 三井化学株式会社 | Manufacturing method of light diffusion sheet |
| TW344032B (en) * | 1995-01-27 | 1998-11-01 | Mitsui Toatsu Chemicals | Light reflective sheet and light reflector using it |
| JPH0963329A (en) * | 1995-08-30 | 1997-03-07 | Minnesota Mining & Mfg Co <3M> | Reflection sheet for liquid-crystal backlight |
| JPH09207437A (en) * | 1996-02-05 | 1997-08-12 | Ricoh Co Ltd | Reversible heat-sensitive recording medium and its preparation |
| JP2000122056A (en) * | 1998-10-14 | 2000-04-28 | Enplas Corp | Side light type surface light source device and liquid crystal display device |
| JP2000344875A (en) * | 1999-06-02 | 2000-12-12 | Teijin Ltd | Film for optical diffusion plate, manufacture thereof and optical diffusion film |
| JP2001023425A (en) * | 1999-07-08 | 2001-01-26 | Advanced Display Inc | Lighting system, manufacture thereof, and liquid crystal display device provided with it |
| JP2001166295A (en) * | 1999-12-03 | 2001-06-22 | Cosmo Tec:Kk | Lamp reflector for back light of liquid crystal display device |
| JP2001228313A (en) * | 2000-02-18 | 2001-08-24 | Toray Ind Inc | White laminated polyester film for reflection member of surface light source |
-
2001
- 2001-09-20 JP JP2001286897A patent/JP4766805B2/en not_active Expired - Fee Related
-
2002
- 2002-09-16 CN CNB021306664A patent/CN1270207C/en not_active Expired - Fee Related
- 2002-09-18 KR KR10-2002-0056850A patent/KR100523204B1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| JP2003100127A (en) | 2003-04-04 |
| KR100523204B1 (en) | 2005-10-24 |
| KR20030025832A (en) | 2003-03-29 |
| CN1409160A (en) | 2003-04-09 |
| JP4766805B2 (en) | 2011-09-07 |
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