CN104776329A - Directly under backlight device - Google Patents
Directly under backlight device Download PDFInfo
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- CN104776329A CN104776329A CN201510084602.4A CN201510084602A CN104776329A CN 104776329 A CN104776329 A CN 104776329A CN 201510084602 A CN201510084602 A CN 201510084602A CN 104776329 A CN104776329 A CN 104776329A
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- light source
- linear light
- optical component
- reflecting material
- fluorescent tube
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Classifications
-
- 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
- G02F1/133604—Direct backlight with lamps
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Provided is a directly under backlight device for a display unit of high brightness by minimizing uneven brightness of tubes efficiently without using an optical member subjected to special processing.
Description
The divisional application that the application is the applying date is on September 3rd, 2009, denomination of invention is the Chinese patent application 200980127476.9 (PCT application PCTJP2009/065384) of " direct backlight apparatus ".
Technical field
The present invention relates to the direct backlight apparatus of various display unit, particularly liquid crystal indicator.
Background technology
Liquid crystal indicator is being representative with notebook computer and mobile phone, is using in the multiple use such as TV, monitor, auto navigation.In liquid crystal indicator, be loaded as the backlight arrangement of light source, form following structure, that is, pass in liquid crystal cell and from the light of backlight arrangement injection, it is controlled, show thus.Characteristic required by this backlight arrangement is not only the light source as simple injection light, and picture entirety will be made bright and luminescence equably.
The structure of backlight arrangement can be roughly divided into two kinds.A kind of is the mode being referred to as side light type backlight source.Which is mainly used in such as requiring, in the notebook computer of slimming miniaturization etc., it is characterized in that using light guide plate as basic structure.When for side light type backlight source, at the side of light guide plate configuration light source, make light incident to light guide plate by side, make light guide plate inner full-reflection while propagate light in whole, under the effect of the diffusion point be processed to form light guide plate inner surface etc., make a part of light depart from total reflection condition simultaneously, daylighting before light guide plate, plays a role as backlight, i.e. area source thus.When for side light type backlight source, in addition to the foregoing structure, also use following multiple blooming, that is, there is the reflective film of the light reflection making to spill from the inner surface of light guide plate, the function recycled; Make the diffusion disk of the light uniformization penetrated from light guide plate above; To improve the concentration piece of prismatic lens for representative of front face brightness; And the brightness of brightness on raising liquid crystal panel improves the multiple optical thin films such as sheet material.
In addition, another kind of mode is the mode being referred to as direct-lighting backlight.Which is preferred for requiring, in the television applications of maximization high brightness, to it is characterized in that, as basic structure, does not use light guide plate, directly arranges fluorescent tube in picture inside, or with the mode collocation point light source led of many wire.By being arranged in parallel in inner many of picture the linear light source be made up of the fluorescent tube of wire or a part of wire and LED, not only can being suitable for large picture, and brightness can being guaranteed fully.
But, even if there is feature also can produce brightness irregularities (brightness irregularities) in the picture that caused by the fluorescent tube or LED that are configured at picture inside, and then above-mentionedly unevenly become the point-like of fluorescent tube or LED and the image (hereinafter referred to as pipe brightness irregularities) of wire, become the main cause that image quality reduces.
Therefore, in direct-lighting backlight, in order to eliminate above-mentioned pipe brightness irregularities, the light diffusing board with extremely strong optical diffuse being configured in the upside of fluorescent tube, realizing the uniformity (patent document 1) of picture.Light diffusing board is the light diffusing board be made up of dispersion fine-grained acrylic resin or polycarbonate resin etc.Pipe brightness irregularities can be eliminated by this light diffusing board, realize the homogenising of picture, but owing to making its diffusion strongly, so full light transmittance step-down, light utilization ratio are deteriorated, in addition because diffusion is excessively strong, so light is to unnecessary direction scattering, the brightness in the front needed for result becomes insufficient.
Therefore, light diffusing board configures diffusion disk, described diffusion disk by light isotropically diffusion, while frontal display spotlight effect.Described diffusion disk is the sheet material being referred to as sequin (beads sheet), described sequin forms the diffusing layer containing particulates such as organic crosslinked particles in substrate sheet, this diffusion disk is different from light diffusing board, is the optical thin film of the directive property of the frontal direction shown to a certain degree.
In addition, except above-mentioned sheet material, also load following component, that is, the light rearward penetrated from fluorescent tube or LED is carried out the reflecting member reflected; Prismatic lens for raising light-gathering is the concentration piece of representative; Brightness for separating of the brightness on the polarisation of light light of releasing from fluorescent tube or LED, raising liquid crystal panel improves sheet material etc., combines various sheet material and forms direct backlight apparatus.
But, the direct backlight apparatus of the spot light that the heavy metal amounts such as the direct-lighting backlight used in the flat panel TV received much concern in recent years, the direct-lighting backlight cutting down the fluorescent tube quantity of lift-launch from the viewpoint of environmental protection in order to reduce power consumption and lift-launch mercury are few and LED, exists and is easy to produce the also not enough situation of pipe brightness irregularities, brightness significantly.Therefore, need to use multiple above-mentioned optical component, be likely difficult to slimming, cause cost to improve, and then the power consumption used when optical component manufactures increases, and increases carrying capacity of environment on the contrary.
In order to solve the problem, also disclose following method: by light diffusing board being implemented the process of the jagged prism shape of section, realize the Function Integration Mechanism of various sheet material and the method (patent document 2) of performance raising; And in order to be suitable for the light diffusing board implementing the jagged prism shape process of section, be the method (patent document 3) of convex by reflecting member processing and forming.
Patent document 1: Japanese Unexamined Patent Publication 2004-29091 publication
Patent document 2: Japanese Unexamined Patent Publication 2006-164890 publication
Patent document 3: Japanese Unexamined Patent Publication 2006-155926 publication
Summary of the invention
Although the light diffusing board with extremely strong optical diffuse described in patent document 1, has the effect eliminated pipe brightness irregularities, improve picture homogeneous degree, and full light transmittance uprises, and is difficult to carry out high brightness.
In addition, as described in patent document 2,3, light diffusing board and reflecting member are implemented to the method for processing and forming, not only from the viewpoint of cost and productivity ratio not preferably, and be difficult to realize the uniformity and brightness, actual conditions not yet find basic countermeasure simultaneously.
In view of above-mentioned prior art background, the invention provides a kind of brightness irregularities of killer tube effectively and for the direct backlight apparatus of high brightness display unit.
That is, the invention provides a kind of direct backlight apparatus, even if described direct backlight apparatus is not implemented special processing to optical component and uses, also can effective killer tube brightness irregularities and for high brightness display unit.
In order to solve above-mentioned problem, the present invention adopts following structure.That is, direct backlight apparatus of the present invention, the order such according to reflecting material, multiple linear light source and optical component group is configured, and meets following condition (i) ~ (v).
I mode that () above-mentioned multiple linear light source is parallel to each other with the length direction of each linear light source is configured.
(ii) haze value based on JIS K 7136 (2000) of the optical component near above-mentioned linear light source in above-mentioned optical component group is less than 99.0%, and described haze value makes light carry out measuring from the face incidence of Line of light source.
(iii) there is prismatic lens in above-mentioned optical component group, above-mentioned prismatic lens with above-mentioned Line of light source be opposite side face on be formed with multiple convex shapes along unidirectional extension, the length direction of multiple convex shape is parallel to each other, and the length direction of multiple convex shape is parallel with the length direction of multiple linear light source.
(iv) the 60 ° of glossiness measured based on JIS K 7105 (1981) in the face of the above-mentioned Line of light source of above-mentioned reflecting material are less than 5.
V distance in the heart in adjacent linear light source in above-mentioned multiple linear light source is set to L by (), when distance from the center of linear light source to the optical component near above-mentioned linear light source is set to H, the θ meeting following formula (1) is 45 °≤θ≤70 °.
θ=tan
-1((L/2)/H) ... formula (1)
According to the present invention, even if can provide a kind of optical component implementing special processing that do not use also can killer tube brightness irregularities and for the direct backlight apparatus of high brightness display unit effectively.
Accompanying drawing explanation
[Fig. 1] is the profile of direct backlight apparatus of the present invention.
[Fig. 2] is for representing the figure of the direct backlight apparatus used pipe brightness irregularities of the present invention and brightness evaluation from top medelling.
Detailed description of the invention
The present invention is directed to above-mentioned problem, namely the direct backlight apparatus of killer tube brightness irregularities is realized, for the combination of optical component structure and the optical characteristics of optical component, conduct in-depth research, the component with specific optical characteristics is carried out particular combination used, even if result shows not implement special processing to optical component, also above-mentioned problem can be solved at one stroke.
Direct backlight apparatus of the present invention, the order such according to reflecting material, multiple linear light source and optical component group is configured, and meets following condition (i) ~ (v).
I mode that () above-mentioned multiple linear light source is parallel to each other with the length direction of each linear light source is configured.
(ii) haze value based on JIS K 7136 (2000) of the optical component near above-mentioned linear light source in above-mentioned optical component group is less than 99.0%, and described haze value makes light carry out measuring from the face incidence of Line of light source.
(iii) there is prismatic lens in above-mentioned optical component group, this prismatic lens with above-mentioned Line of light source be opposite side face on be formed with multiple convex shapes along unidirectional extension, the length direction of multiple convex shape is parallel to each other, and the length direction of multiple convex shape is parallel with the length direction of multiple linear light source.
(iv) the 60 ° of glossiness measured based on JIS K 7105 (1981) in the face of the above-mentioned Line of light source of above-mentioned reflecting material are less than 5.
V distance in the heart in linear light source adjacent in above-mentioned multiple linear light source is set to L by (), when distance from the center of linear light source to the optical component near above-mentioned linear light source is set to H, the θ meeting following formula (1) is 45 °≤θ≤70 °.
θ=tan
-1((L/2)/H) ... formula (1)
When adopting above-mentioned Staight downward type backlight source structure, can the reason of killer tube brightness irregularities although it be unclear that, can infer that reason is as follows.
Namely, in the light of being released by fluorescent tube or LED, arrive reflecting material side light be reflected onto incide prismatic lens till during, be diffusely reflected with certain angle in reflecting material, because the optical component diffused through the haze value with above-mentioned (ii) with above-mentioned angle is diffused again, so be diffused with the angle of fitting mutually with the angle light-focusing function of this prism when arriving prismatic lens, infer and contribute to killer tube brightness irregularities.Below, each component is explained.
In direct backlight apparatus of the present invention, (i) multiple linear light source is configured in the mode that the length direction of each linear light source is parallel.So-called linear light source herein, as long as have the light source of the shape (U-shaped pipe, W word pipe etc.) of straight line portion in this light source as linearity of light source, light source, spot light be configured to the light source of wire or observe the light source of light and shade with linearity, there is no particular limitation.Such as, preferably use with cold-cathode tube be representative fluorescent tube or the LED (white type and RGB type) of spot light is configured to the light source of wire.The above-mentioned direction along straight line is the length direction of linear light source.
In direct backlight apparatus of the present invention, above-mentioned linear light source is configured in multiple parallel mode.Multiple linear light source can not strictly configure abreast, also can configure in an essentially parallel fashion, and the acute angle that the length direction of each linear light source is formed is less than 10 °.
In addition, the arrangement pitches of light source is unequal in direct-lighting backlight cell arrangement face, is also preferred version.Such as, when the central portion of direct backlight apparatus is become clear, can be realized by the light source arrangement pitches shortened at picture central portion.In addition, due to dimmed near the framework of picture end housing, so also can brighten by shortening arrangement pitches herein.As mentioned above, in order to regulate brightness in picture, preferred scheme is that the arrangement pitches of light source is unequal plays effect by making.
Must satisfy condition in direct backlight apparatus of the present invention (ii), namely, the haze value based on JIS K 7136 (2000) near the optical component of linear light source in optical component group is less than 99.0%, and described haze value makes light carry out measuring from the face incidence of Line of light source.When haze value is greater than 99.0%, infer that superfluous diffused light becomes many, even if the direct backlight apparatus for meeting above-mentioned condition (i), (iii), (iv), (v), can not killer tube brightness irregularities.As long as haze value is less than 99.0%, just can obtain the effect of the pipe brightness irregularities that can suppress in direct backlight apparatus, therefore to lower limit, there is no particular limitation, but lower limit is 0.0% in fact.Haze value is less, has the tendency that the effect of killer tube brightness irregularities is less, but has the advantage that can obtain high brightness, on the other hand, haze value is larger, there is the advantage of the effect of the pipe brightness irregularities that can be inhibited, selects according to required purposes etc.Realize in the effect of above-mentioned killer tube brightness irregularities and the implication of brightness simultaneously, owing to also there is the combination with other components such as reflecting material, so cannot treat different things as the same, but haze value obtains balancing performance good direct backlight apparatus possibility when being 97.5 ~ 98.5% is high, for preferably.
Use Japanese electric look industry (strain) nephelometer processed (haze meter) NDH-2000, measure the haze value in the present invention based on JIS K 7136 (2000).First, initial according to after the standard adjustment of machine, above-mentioned component is cut into the square size of 8cm, when being configured in direct backlight apparatus, according to making the parallel light beam mode that (error ± 2 ° within) at a right angle are incident from the face of Line of light source install, measure.Every 1 sample determination 5 place, is respectively 4 angles and core, measures 5 samples altogether, using the mean value at total 25 place as haze value.
By being the reason of effect that the optical component of less than 99.0% is configured at the pipe brightness irregularities that can be inhibited near linear light source by haze value, it be unclear that, but be inferred as following reason.
Namely, infer through be configured in incide following prismatic lens near the light of the optical component of linear light source time, the angular distribution being suitable for prismatic lens is there is in its incidence angle, due to 99.0% be border, haze value cannot obtain the effect of killer tube brightness irregularities, so the haze value giving the optical component of its incident angle distribution is less than 99.0% when being greater than this border.Even if be configured from Line of light source according to the optical component of haze value more than 99.0%, order that the optical component of haze value less than 99.0% is such, the effect of the present application can not be obtained.If the haze value near the optical component of above-mentioned linear light source is less than 99.0%, can be then any material, shape, such as can enumerate acrylic resin, polystyrene resin, polycarbonate resin, make to have ester ring type structure and so on main chain and/or side chain resin etc. in containing the additives such as particle and be shaped to the sheet material etc. of the material of tabular or thin-film sheet shape, threadiness or cloth-like.And then, in the scope of effect not hindering invention, on any one or both sides on above-mentioned substance surface, also can arrange with prism shape or the semi-spherical shape pattern form that is representative etc. or resin bed containing particle, there is layer through polarisation of light light separation function, be not particularly limited to this, in order to balance obtains the performance of more high brightness and killer tube brightness irregularities well, preferably use the optical component that excipient is prism shape.As above-mentioned optical component, specifically, such as can enumerate Sumipex (registration mark) RM series (Sumitomo Chemical (strain) system of acrylic resin light diffusing board, Crarex (registration mark) DR series (day east Resin Industry (strain) system), Panlight (registration mark) series (Supreme Being people changes into (strain) makes) of polycarbonate resin light diffusing board, polystyrene resins light diffusing board (Idemitsu Unitech (strain) system), the Zeonor diffusing panel series ((strain) Optes system) etc. of ester ring type resinae light diffusing board, but be not particularly limited to this.
Direct backlight apparatus of the present invention must satisfy condition (iii), namely, prismatic lens with Line of light source be opposite side face on be formed with multiple convex shapes along unidirectional extension, the length direction of multiple convex shape is parallel, and the length direction of multiple convex shape is parallel with the length direction of multiple linear light source.When not forming above-mentioned convex shape, even if the direct backlight apparatus for meeting above-mentioned condition (i), (ii), (iv), (v), can not killer tube brightness irregularities.Convex shape can be any shape herein, from the shape that the profile view vertical with the length direction of convex shape observes, such as can enumerate biconvex lens and so on semicircle (or it is inverted shape), sinusoidal, approximate ellipsoidal, have subtriangular (isosceles triangle or the non-isosceles triangle) of acute angle obtuse angle square apex angle, arbitrary angle is the approximate polygonal (square at right angle, acute angle obtuse angle, rectangle, trapezoidal, in addition polygon), above-mentioned subtriangular top corner portion is with the shape of circle, waveform, the random shapes etc. that shape and size arrange brokenly in a different manner, but be not particularly limited to this, also can by above-mentioned shape multiple combination.In addition, above-mentioned convex shape can with in sheet surface gapless, namely arrange without par, the mode that is paved with convex shape, and in addition, also can arrange in the mode vacating interval regularly or brokenly, there is no particular limitation.
As the method arranging above-mentioned convex shape, there is no particular limitation, such as, can suitably select following method: carry out shaping method with mould etc. arrange the resin of ultraviolet curing or heat cure type in substrate sheet after; By injection molding for the resin of melting method; The various methods such as the method for embossing processing.Particularly preferred convex shape is the subtriangular of the rectangular drift angle of tool, as its concrete example, can enumerate vikuiti BEF series (3M Inc.) or prismatic film HGL series (EFUN TECHNOLOGY CO.Ltd system) etc.
In addition, for arranging the material of the substrate sheet of convex shape, such as PETG can be enumerated, poly-2, 6-(ethylene naphthalate), PTT, polybutylene terephthalate (PBT), cyclohexanedimethanol copolymer polyester resin, M-phthalic acid copolymer polyester resin, the spiroglycol copolymer polyester resin, the polyester resins such as fluorenes copolymer polyester resin, main chain and/or side chain has the resin of ester ring type structure and so on, polyethylene, polypropylene, polymethylpentene, the polyolefin resins such as ester ring type olefin-copolymerization resin, the acrylic resins such as polymethyl methacrylate, Merlon, polystyrene, polyamide, polyethers, polyesteramide, polyether ester, polyvinyl chloride, and using them as the copolymer of composition, or the thermoplastic resin of the mixture of these resins etc.Wherein, in mechanical strength, heat resistance, dimensional stability, more preferably use the PETG, poly-2 be biaxially stretched, 6-(ethylene naphthalate) or with they mylar such as copolymer or mixture that to be matrix formed with other compositions, but be not particularly limited to this.
In addition, even if arrange convex shape, if the length direction of convex shape and the length direction of linear light source are configured in uneven mode, even if then for meeting the direct backlight apparatus of above-mentioned condition (i), (ii), (iv), (v), can not killer tube brightness irregularities.Herein, the length direction of convex shape does not need completely parallel with the length direction of linear light source, as long as the acute angle that the length direction of convex shape and the length direction of linear light source are formed is less than 10 °, just can present the inhibition of pipe brightness irregularities.
Direct backlight apparatus of the present invention must satisfy condition (iv), that is, the 60 ° of glossiness measured based on JIS K 7105 (1981) in the face of the Line of light source of reflecting material are less than 5.When 60 ° of glossiness are greater than 5, even if the direct backlight apparatus for meeting above-mentioned condition (i), (ii), (iii), (v), can not killer tube brightness irregularities.60 ° of glossiness are preferably less than 4, are more preferably less than 3.
Glossiness of the present invention uses SUGA test system numeral goniophotometer (UGv-4D), based on JIS K 7105 (1981), measures according to the following steps and obtain towards the face of the Line of light source of above-mentioned reflecting material.Setting incidence angle and be 60 ° by firing angle, with make in light source side aperture in the plane of incidence 0.75 ± 0.25 °, in vertical plane 0.75 ± 0.25 °, to make aperture be 4.4 ± 0.1 °, the mode of 11.7 ± 0.2 ° in vertical plane in the plane of incidence in light-receiving device side, the slit that the equipment that arranges is subsidiary.Then, the subsidiary camera bellows of machine and master reference face (black glass) is used to form standard composition.Cut out the square sample of 10cm from each reflecting material, be arranged on determinator, by with the sample lid pressure of black felt lining thereon, sample is not bent.5 samples are measured for each reflecting material, gets its mean value as 60 ° of glossiness.
As long as 60 of above-mentioned reflecting material ° of glossiness are less than 5, can be any material, form, there is no particular limitation, such as can enumerate following material, that is, metal or alloy plate, be provided with on base material metal level or white layer material, non-woven fabrics and so on fibrous material is shaped to sheet material, in resin inside containing be shaped to during inconsistent organic or inorganic particle white film or sheet material, in resin inside containing being shaped to the material etc. of white film or sheet during multiple bubble.Wherein, the difficulty or ease regulated from the viewpoint of glossiness, for the light source that the color rendition of LED and so on is good, there is uniform reflecting properties, brightness etc. when incorporating into direct backlight apparatus, preferred resin is inner contains the white film of multiple bubble or the reflecting material of sheet.Inner containing alveolate method as making, such as can enumerate the method making the foaming of resin inside; And during containing organic or inorganic particle inconsistent with resin, utilize the operations such as stretching to form the method etc. of bubble at particle periphery.Particularly, the visible reflectance of reflecting material of the present invention is more high better, therefore preferably uses inner containing alveolate white film.Do not limit as above-mentioned white film, as an example preferably use porous do not stretch or biaxial stretch-formed polypropylene film, porous the pet film not stretching or stretch.About their manufacture method etc., be documented in detail in (0007) ~ (0018) section of (0034) of Japanese Unexamined Patent Publication 8-262208 publication ~ (0057) section, Japanese Unexamined Patent Publication 2002-90515 publication, (0008) ~ (0034) section of Japanese Unexamined Patent Publication 2002-138150 publication etc.Wherein, for the foregoing reasons, as the white film particularly preferably biaxial stretch-formed pet film of the white of porous disclosed in Japanese Unexamined Patent Publication 2002-90515 publication of reflecting material of the present invention, and from the viewpoint of heat resistance and reflectivity, particularly preferably with the mixing and/or the biaxial stretch-formed pet film of porous that copolymerization is formed white of PEN.
The structure of above-mentioned white film, suitably can select according to the purposes used and required characteristic, there is no particular limitation, but preferably there is the individual layer of more than at least 1 layer structure and/or the laminated film of more than 2 layers, preferably above-mentioned at least 1 layer with upper containing bubble, inorganic particulate, in organic filler wantonly more than a kind.
As the example of single layer structure (=1 layer), such as, can enumerate following structure, that is, be only the white film of individual layer and A layer, and make the single layer structure of the structure containing in bubble, inorganic particulate, organic filler wantonly more than a kind in above-mentioned A layer.In addition, as the example of 2 Rotating fields, following structure can be enumerated, namely, the white film of stacked B layer, i.e. A layer/B layer 2 Rotating fields on above-mentioned A layer, and 2 Rotating fields making the structure containing in bubble, inorganic particulate, organic filler wantonly more than a kind in above-mentioned A, B layer at least wantonly 1 layer.And then, as the example of 3-tier architecture, following structure can be enumerated, namely, as described above, the white film of 3 multilayer laminated structure of stacked A layer/B layer/A layer or A layer/B layer/3 layers, C layer, and the 3-tier architecture making the structure containing in bubble, inorganic particulate, organic filler wantonly more than a kind at least 1 layer of each layer inside.When for 3-tier architecture, from the viewpoint of productivity ratio, most preferably B layer is for containing alveolate layer.
The inorganic particles contained in above-mentioned white film and/or the number average bead diameter of organic filler are preferably 0.3 ~ 2.0 μm.As above-mentioned organic filler, preferably using dystectic cross-linked polymer composition as the resin of main body, such as, can enumerate mylar, benzoguanamine and so on polyamide-based resin particle, polyurethane resin, acrylic resin, methacrylic resin, polyamide, polyvinyl resin, acrylic resin, Corvic, polyvinylidene fluoride resin, polystyrene resin, vinylite, fluorine-type resin, organic siliconresin particle and their hollow-particle etc.Above-mentioned resin can be used alone, or also can use polymer of more than two kinds or mixture.Sunproof from the viewpoint of white film, containing ultra-violet absorber, light stabilizer in preferably contained spherical particle.In addition, as above-mentioned inorganic particulate, calcium carbonate, magnesium carbonate, zinc carbonate, titanium oxide, zinc oxide, cerium oxide, magnesia, barium sulfate, zinc sulphide, calcium phosphate, silica, aluminium oxide, mica, mica titanium, talcum, clay, kaolin, lithium fluoride, calcirm-fluoride etc. can be used.
As the example of above-mentioned white film, first, as the white film of single layer structure, Lumirror (registration mark) E20 (east beautiful (strain) system), SY64, SY70 (SKC system), White Refstar (registration mark) WS-220 (Mitsui Chemicals (strain) system) etc. can be enumerated; As the white film of 2 Rotating fields, Tetron (registration mark) film UXZ1, UXSP (Supreme Being people's DuPont Film (strain) system) etc. can be enumerated; As the white film of 3-tier architecture, Lumirror (registration mark) E60L, E6SL, E6SR, E6SQ, E6Z, E6Z2, E80, E80A, E80B (east beautiful (strain) system), Tetron (registration mark) film UX, UXH (Supreme Being people's DuPont Film (strain) system), PL230 (Mitsubishi's resin (strain) system) etc. can be enumerated.In addition, as the example of the white sheet material of structure apart from the above, Optilon ACR3000, ACR3020 (Du Pont's (strain) system), MCPET (registration mark) (Furukawa electrical industry (strain) system) can be enumerated.If above-mentioned (iv) is less than 5 towards 60 ° of glossiness based on JIS K 7105 (1981) in the face of Line of light source, then can use using the form of monomer as the reflecting material of direct backlight apparatus of the present invention, when glossiness is greater than 5, can adopt as described below, glossiness is adjusted to less than 5 and use.
When 60 ° of glossiness of the base material of the reflecting material in the present invention, film or sheet material itself are greater than 5, need, by implementing various processing to base material further, 60 ° of glossiness to be adjusted to less than 5 and to make reflecting material.There is no particular limitation for processing method, such as, can suitably select following method: with carrying out peeling off the various methods such as the method for processing in the method for the method of the method for the method of the shaping method such as mould, embossing processing, sandblasting processing, lamination process, coating waste water, the structure of more than 2 layers to top layer after arranging the resin of ultraviolet curing or heat cure type.
Reflecting material in the present invention, preferably has the resin bed containing particle on the face of wire light source side.Due to containing particle, so be easy to 60 ° of glossiness to be adjusted to less than 5, so relevant with the suppression of pipe brightness irregularities.The shape of above-mentioned particle, unified restriction, such as can enumerate starlike, sheet or discoid and so on flat, rhombus, rectangular shape, needle-like, shrunk, unsetting and so on aspherical or spherically (not necessarily only represent spherical shape, also refer to that the section shape of particle is circle, ellipse, sub-circular, approximate ellipsoidal etc. by curved surface surround spherical) etc., in addition, the particle of above-mentioned shape can be also porous, atresia, hollow, is not particularly limited to this.And then by containing above-mentioned particle, if 60 ° of glossiness are less than 5, then can be any one in organic compounds, inorganic matter, inorganic compound, unified restriction.
The face of the Line of light source of reflecting material arranges the method for resin bed containing particle, such as, can enumerate following method: adopt intaglio plate coating, roller coat, spin coating, inverse formula coating, rod paintings, silk screen coating, scraper for coating, airblade coating and the various coating process of impregnating to carry out the coating fluid containing particle and adhesive resin etc. when manufacture reflecting material being coated with (online coating) or the method for coating layer is set by the reflecting material after crystal orientation terminates carrying out be coated with (off-line coating) etc.; Or the film containing particle or sheet material are carried out the method bonded by lamination etc., but be not particularly limited in this.In addition, arrange the face of the above-mentioned layer containing particle, there is no particular limitation, when reflecting material is the 3-tier architecture of 2 Rotating fields of A layer/B layer, A layer/B layer/A layer or A layer/B layer/C layer, can be arranged on either side.
As the above-mentioned example with the reflecting material of layer containing particle, Lumirror (registration mark) E6QD, E6ZD (east beautiful (strain) system), DR240T, RE240T (Changxing chemical industry Co., Ltd system) etc. can be enumerated.
When reflecting material in the present invention is used for direct backlight apparatus, under the effect of the light sent from the lamp of light source, particularly cold-cathode tube etc., the particle wherein particularly sometimes contained in reflecting material and resin bed under action of ultraviolet radiation worsens optics such as (worsen or degraded decomposition deterioration etc.) such as xanthochromias.Therefore, in the scope not hindering effect of the present invention, preferably in the resin forming the resin bed containing particle be arranged on reflecting material, contain ultra-violet absorber and/or light stabilizer.
The containing ratio of the above-mentioned particle in the resin bed being arranged in reflecting material in the present invention, there is no particular limitation, as long as 60 ° of glossiness are less than 5, in addition, owing to also depending on the kind, productivity ratio etc. of reflecting material or particle, so can not limit entirely, but the containing ratio that the harmony of the effect that pipe brightness irregularities can be selected to suppress and brightness is good.Consider glossiness and productivity ratio, be preferably less than more than 0.2 % by weight 75 % by weight relative to whole resin bed.When the containing ratio of this particle is less than 0.2 % by weight, 60 ° of glossiness are not less than 5 sometimes.In addition, because during more than 75 % by weight, productivity ratio is extremely poor, so preferably control below 75 % by weight.Be preferably less than more than 50 % by weight 75 % by weight, be more preferably less than more than 65 % by weight 75 % by weight.
The thickness being arranged at the resin bed containing particle on reflecting material in the present invention, depends on the kind of reflecting material or particle, containing ratio, but is preferably 0.05 ~ 50 μm.When the thickness of resin bed is less than 0.05 μm, sometimes to the detriment of killer tube brightness irregularities.When thickness is more than 50 μm on the contrary, not preferred from the viewpoint of economy.It should be noted that, the thickness of so-called resin bed is the gross thickness of the resin bed containing particle herein, and when having more than 1 layer, according to the thickness of its resin bed entirety, namely the thickness of multi-layer resinous layer entirety is tried to achieve.
Direct backlight apparatus in the present invention must satisfy condition (v), namely, distance between adjacent wire light source center is set to L, when the distance from the center of linear light source to the optical component near linear light source is set to H, the θ making above-mentioned linear light source meet following formula (1) is that 45 °≤θ≤70 ° are configured.
θ=tan
-1((L/2)/H) ... formula (1)
More preferably to satisfy equation the θ of (1) be 50 °≤mode of θ≤70 ° is configured, particularly preferably to satisfy equation the θ of (1) be 60 °≤mode of θ≤70 ° is configured.
So-called θ becomes large herein, refer to linear light source and and closest to linear light source optical component between distance to diminish or distance between linear light source expands.Slim direct backlight apparatus tends to the former, considers to cut down to reduce power consumption the direct backlight apparatus of the quantity of the fluorescent tube of lift-launch tend to the latter from the aspect of environmental protection.In the present invention, surprisingly meet the θ of formula (1) large time, the effect of killer tube brightness irregularities is large, that is, in direct backlight apparatus that is slim or that cut down fluorescent tube quantity, play the effect of larger killer tube brightness irregularities.
More preferably to satisfy equation the θ of (1) be 45 °≤θ≤70 ° and the mode meeting H≤10mm configure the direct-lighting backlight of linear light source, the effect of further killer tube brightness irregularities is large.
Direct backlight apparatus of the present invention is configured according to the order that reflecting material, multiple linear light source, optical component group are such, as long as meet above-mentioned condition (i) ~ (v), then can be also the optical component of less than 99.0%, the optical component (hereinafter referred to as other optical sheets) of prismatic lens or film in addition or sheet material containing haze value further in optical component group.As the formation of optical component group, from Line of light source, comprise " haze value is optical component/prismatic lens/other optical sheets of less than 99.0% ", " haze value is optical component/other optical sheet/prismatic lenses of less than 99.0% ", " haze value is the optical sheet/prismatic lens/prismatic lens of less than 99.0% " etc. successively, but be not particularly limited to this.
As other optical sheets above-mentioned, such as, can enumerate following film or sheet material, that is, by arranging the layer or semi-spherical shape projection that contain particle on base material, there is film or the sheet material of the function that can improve optical diffuse or brightness; And by controlling the properties of polarized light of transmitted light, there are the film of polarised light separation function or sheet material etc., but be not particularly limited to this.As above-mentioned film or sheet element, specifically, such as can enumerate Light Up 100GM2, Light Up 100GM3 ((strain) woody system), UTEI, UTE II (MNTech Co., Ltd system), vikuiti DBEF series (3M Inc.) etc., but be not particularly limited to this.
In the scope not damaging effect of the present invention, can haze value be in the present invention less than 99.0% optical component, prismatic lens, reflecting material, be layered on reflecting material containing particle resin bed in, add various additive.As additive, such as, can use organic and/or inorganic particles, take fluorescent whitening agent as the luminescent material of representative, crosslinking agent, fire retardant, flame retardant, heat-resisting stabilizing agent, antioxidative stabilizer, organic lubricant, antistatic agent, nucleator, dyestuff, filler, dispersant and coupling agent etc.
Embodiment
Assay method and evaluation method as follows.
(1) haze value of component
Use Japanese electric look industry (strain) nephelometer processed (haze meter) NDH-2000, measure based on JIS K 7136 (2000).The component (wherein, not comprising reflecting material) be configured near linear light source place of direct backlight apparatus is cut into the square size of 8cm as sample.When the laminating such as multiple component jointing materials, flood the sufficient time in organic solvent, peel off each component and non-scratch surface, after wiping jointing material etc., fully dry, use the material of gained.By be configured in be configured on direct backlight apparatus near the sample of component of the position of the linear light source taken out time, so that from the face of Line of light source, the mode of (within error ± 2) at a right angle incoming parallel beam configures and measures.Every 1 sample determination 5 place, is respectively 4 jiaos and core, measures 5 samples altogether, will amount to the mean value at 25 places as haze value.
(2) presence or absence of the convex shape of sheet material, the shape of convex shape
Use Japanese Mictom research institute (strain) rotary microtom processed, with tilt rake angle 3 ° on the direction vertical with sheet plane and as far as possible vertical with the length direction of convex shape mode cutting sample.Use Topcon Inc. scanning electron microscope ABT-32 to observe the section of resulting sheet, adopt observation multiplying power 2500 doubly to make convex shape be presented within sweep of the eye, in addition, suitably regulate the contrast of image to observe the shape of convex shape.Similarly observe with the interval of 2 ~ 5cm on the length direction of convex shape and amount to 5 places, whether observe multiple convex shape roughly along unidirectional extension.When can not confirm convex shape, similarly doubly observe to observe multiplying power 5000, even if doubly observe to observe multiplying power 10000 when still can not observe like this.When adopting a certain observation multiplying power can confirm the roughly unidirectional extension of multiple convex shape, then think that there is convex shape; With observe arbitrarily multiplying power all can not confirm the roughly unidirectional extension of convex shape time, then think there is no convex shape.
(3) 60 ° of glossiness of reflecting material
Use SUGA test system numeral goniophotometer (UGv-4D), based on JIS K7105 (1981), measure according to the following steps towards the face of the Line of light source of reflecting material.Make incidence angle and be 60 ° by firing angle, and with make in light source side aperture in the plane of incidence 0.75 ± 0.25 °, in vertical plane 0.75 ± 0.25 °, make aperture be 4.4 ± 0.1 °, the mode of 11.7 ± 0.2 ° in vertical plane in the plane of incidence at receiver-side, the slit that the equipment that arranges is subsidiary.Then camera bellows and master reference face (black glass) is used to carry out standard correction.Cut out the square sample of 10cm from each reflecting material, be arranged on determinator, with the sample lid pressure of black felt lining thereon, sample is not bent.5 samples are measured for each reflecting material, gets its mean value as 60 ° of glossiness.
(4) presence or absence of resin bed, the shape of particle containing particle of reflecting material
Use Japanese Mictom research institute (strain) rotary microtom processed, make tilt rake angle 3 ° with the direction of reflecting material plane orthogonal on cut off sample.Topcon Inc. scanning electron microscope ABT-32 is used to observe the section of the reflecting material of gained, observation multiplying power 2500 is adopted doubly to make resin bed be presented within sweep of the eye, in addition, the contrast of suitable adjustment image, observes wire light source side with or without resin bed, shape with or without particle and particle.When can not distinguish with or without resin bed, shape with or without particle, particle, similarly also doubly can observe to observe multiplying power 5000, even if when can not distinguish like this, doubly can observe to observe multiplying power 10000.If resin bed and/or particle can be confirmed with a certain observation multiplying power, then judge that there is resin bed and/or particle, if when all can not confirm resin bed and/or particle under arbitrary observation multiplying power, then judge there is no resin bed and/or particle.
(5) brightness of direct backlight apparatus, pipe brightness irregularities
Fluorescent tube is lighted after the various component of configuration in following direct-lighting backlight (totally 2 kinds).From lighting after 1 hour, use (strain) Konica Minolta Sensing two-dimensional brightness meter CA-2000, as shown in Figure 1 from being frontal relative to direct backlight apparatus, namely vertical with direct backlight apparatus direction, measures brightness and pipe brightness irregularities.Measure region be in direct backlight apparatus core using the length of 20cm on the direction parallel with fluorescent tube as length, using 7 times of distances of the distance between centers of adjacent phosphor pipe on the direction vertical with fluorescent tube as wide, the length of the quadrangle of above-mentioned length and width is put into the region of 7 fluorescent tubes.Obtain brightness and the uniformity in this mensuration region.
Brightness is evaluated with the form of the mean flow rate of above-mentioned zone.
Pipe brightness irregularities is as described below to be obtained.As shown in Figure 2,9 are introduced by the longitudinal direction of above-mentioned zone with the line of 2cm interval 10 decile (dotted line 10 of Fig. 2).Above-mentioned each line is as the mensuration line of pipe brightness irregularities.When mensuration line along every 1 pipe brightness irregularities measures brightness, can observe and around phase specific luminance more much higher peak, and the multiple paddy lower with phase specific luminance around.For the mensuration line of 1 pipe brightness irregularities, using from maximum brightness successively the mean value of 5 high luminance values as L
max, using from minimum brightness successively the mean value of 5 low brightness values as L
min, by L
maxwith L
minmean value as L
ave, use following formula (2) to calculate the uniformity of above-mentioned pipe brightness irregularities mensuration line.And, using the mean value of the uniformity of the mensuration line of 9 pipe brightness irregularities as pipe brightness irregularities.It should be noted that, its mean value larger expression pipe brightness irregularities is stronger, and less expression pipe brightness irregularities is more weak.
Article 1, pipe brightness irregularities measures the uniformity (%)=(L of line
max-L
min)/L
ave× 100... (2).
Below represent the structure of the device used in embodiment, comparative example.
(1) device 1
Size: 32 inches (725mm × 413mm, diagonal angle 834mm)
The diameter of fluorescent tube: 3mm
The radical of fluorescent tube: 19
The distance between centers L:20.4mm of fluorescent tube
The center of fluorescent tube and the distance H:6.5mm of hithermost optical component
The center of fluorescent tube and the distance of reflecting material: 3.0mm
θ：57.5°(θ＝tan
-1((L/2)/H))、
(2) device 2
Size: 20 inches (424mm × 331mm, diagonal angle 537mm)
The diameter of fluorescent tube: 4mm
The radical of fluorescent tube: 10
The distance between centers L:30mm of fluorescent tube
Center and the distance H:13mm near optical component of fluorescent tube
The center of fluorescent tube and the distance of reflecting material: 6.0mm
θ：49.1°(θ＝tan
-1((L/2)/H)。
(3) device 3
Size: 32 inches (725mm × 413mm, diagonal angle 834mm)
The diameter of fluorescent tube: 3mm
The radical of fluorescent tube: 10
The distance between centers L:40.8mm of fluorescent tube
The center of fluorescent tube and the distance H:9mm of hithermost optical component
The center of fluorescent tube and the distance of reflecting material: 3.0mm
θ：66.2°(θ＝tan
-1((L/2)/H)。
(4) device 4
Size: 20 inches (424mm × 331mm, diagonal angle 537mm)
The diameter of fluorescent tube: 4mm
The radical of fluorescent tube: 10
The distance between centers L:30mm of fluorescent tube
The center of fluorescent tube and the center of distance H:16mm fluorescent tube of hithermost optical component and the distance of reflecting material: 6.0mm
θ：41.4°(θ＝tan
-1((L/2)/H)。
(5) device 5
Size: 32 inches (725mm × 413mm, diagonal angle 834mm)
The diameter of fluorescent tube: 3mm
The radical of fluorescent tube: 10
The distance between centers L:40.8mm of fluorescent tube
The center of fluorescent tube and the distance H:6.5mm of hithermost optical component
The center of fluorescent tube and the distance of reflecting material: 3.0mm
θ：72.3°(θ＝tan
-1((L/2)/H)。
Below represent the component A ~ D used in each embodiment, comparative example, and the lamination order of these components.
A: closest to the optical component of fluorescent tube
(*), when existence is formed with the face of convex shape, the opposite face in this face is arranged to towards fluorescent tube side.
B: prismatic lens (length direction of the convex shape on this sheet material and the setting position relation of fluorescent tube rectilinear direction)
(*) opposite face in the face being provided with convex shape is arranged to towards fluorescent tube side.
Other optical sheets outside C:A, B
(*), when there is male and fomale(M&F), the opposite face in this face is arranged to towards fluorescent tube side.
D: reflecting material
(*) glossiness showing to record in 1-1 is towards the value in the face of fluorescent tube side.
Lamination order: describe the situation except above-mentioned D (reflecting material).So-called A/B/C is stacked by the order of A, B, C from fluorescent tube side.
(embodiment 1)
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A:Clarex (registration mark) DR-III C-A DR-80C (day east Resin Industry (strain) system)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
C: nothing
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm)
Lamination order: A/B.
(embodiment 2)
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A:Sumipex E (registration mark) RM804S (Sumitomo Chemical (strain) Inc.)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
C: nothing
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm)
Lamination order: A/B.
(embodiment 3)
First, dismantle 32 inch liquid crystal TVs ((strain) Hitachi system, Wooo (registration mark) UT32-Hv700B), the one side relative with fluorescent tube side has the multiple convex shapes along unidirectional extension, the resin plate of the thickness 2mm that the rectilinear direction of the length direction and fluorescent tube that obtain this convex shape be arranged in parallel.For this resin plate, from during fluorescent tube side incident light when carrying before dismounting, be 98.3% based on the haze value of JIS K7136 (2000), make the direct half-twist of the plane of incidence from this state, similarly measure, result haze value is 98.1%.
Get its mean value, the haze value of this resin plate is 98.2%.
Then, after this resin plate is cut into the size that can be arranged in said apparatus 1 ~ 5 (relief pattern resin plate made in following brief note), in the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A: relief pattern resin plate (with fluorescent tube rectilinear direction parallel direction on the length direction of convex shape is set)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
C: nothing
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm)
Lamination order: A/B.
(embodiment 4)
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A:Clarex (registration mark) DR-III C-A DR-90C (day east Resin Industry (strain) system)
B:vikuiti BEFIII 90/50T (3M Inc., convex: drift angle is the spacing of the triangle at right angle, convex: 50 μm) (arranging in parallel direction)
C: nothing
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm)
Lamination order: A/B.
(embodiment 5)
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A: relief pattern resin plate (with fluorescent tube rectilinear direction parallel direction on the length direction of convex shape is set)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
C: nothing
D: the reflecting material made according to following method for making A
(method for making A)
Stir while add following substances, prepare coating fluid, described material comprises: Halshybrid (registration mark) Uv-G720T (acrylic copolymer, the solution of concentration 40%, refractive index 1.56, (strain) Japanese catalyst system) 10.0g, ethyl acetate 7.0g, TechPolymer (registration mark) TRX05S (acrylic compounds spherical particle, refractive index 1.49, ponding finished industrial (strain) is made) 9.2g.Use metal bar #16, in the one side of the white film (Dongli Ltd. Lumirror (registration mark) E6SQ) formed at the biaxial stretch-formed PETG by the porous of 188 μm by this coating solution, coating layer is set under the drying condition of 120 DEG C, 1 minute.The glossiness of reflecting material is 5.
Lamination order: A/B.
(embodiment 6)
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A: relief pattern resin plate (with fluorescent tube rectilinear direction parallel direction on the length direction of convex shape is set)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
((strain) woody system arranges the light diffusing board of the layer containing particle, haze value: 95.5%) to C:Light Up100GM2 on top layer
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm)
Lamination order: A/B/C.
(embodiment 7)
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A: relief pattern resin plate (with fluorescent tube rectilinear direction parallel direction on the length direction of convex shape is set)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
(3M Inc. has the sheet material of polarised light separation function, haze value: 81.5%) to C:vikuiti DBEF
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm)
Lamination order: A/B/C.
(embodiment 8)
In the structure of following A ~ D, said apparatus 1,2 and 3 is used to evaluate.
A: relief pattern resin plate (with fluorescent tube rectilinear direction parallel direction on the length direction of convex shape is set)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
(MNTech Co., Ltd system is provided with the light diffusing patch containing semi-spherical shape projection, haze value: 89.6%) to C:UTE II on top layer
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm)
Lamination order: A/B/C.
(embodiment 9)
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A: relief pattern resin plate (with fluorescent tube rectilinear direction parallel direction on the length direction of convex shape is set)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
((strain) woody system, is provided with the light diffusing patch of the layer containing particle, haze value: 95.5%) to C1:Light Up 100GM2 on top layer
(3M Inc. has the sheet material of polarised light separation function, haze value: 81.5%) to C2:vikuiti DBEF
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm)
Lamination order: A/C1/B/C2.
(embodiment 10)
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A: relief pattern resin plate (with fluorescent tube rectilinear direction parallel direction on the length direction of convex shape is set)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
((strain) woody system, is provided with the light diffusing patch of the layer containing particle, haze value: 95.5%) to C:Light Up 100GM2 on top layer
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm)
Lamination order: A/C/B/C/C.
(embodiment 11)
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A: relief pattern resin plate (with fluorescent tube rectilinear direction parallel direction on the length direction of convex shape is set)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
((strain) woody system, top layer is provided with C:Light Up 100GM2 the light diffusing patch of the layer containing particle, haze value: 95.5%)
D: the reflecting material made according to following method for making B
(method for making B)
Stir while add following substances, prepare coating fluid, described material comprises: Halshybrid (registration mark) Uv-G720T (acrylic copolymer, the solution of concentration 40%, refractive index 1.56, (strain) Japanese catalyst system) 10.0g, ethyl acetate 7.0g, TechPolymer (trade mark registration) TRX05S (ponding finished industrial (strain) is made for acrylic compounds spherical particle, refractive index 1.49) 9.2g.Use metal bar #24, in the one side of the white film (Dongli Ltd. Lumirror (registration mark) E80A) formed at the biaxial stretch-formed PETG by 188 μm of porous by this coating solution, coating layer is set under the drying condition of 120 DEG C, 1 minute.The glossiness of reflecting material is 3.
(comparative example 1)
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A:Clarex (registration mark) DR-III C-A DR-90C (day east Resin Industry (strain) system)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
C: nothing
D:Lumirror (registration mark) E6Sv (east beautiful (strain) system, thickness 225 μm)
(comparative example 2)
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A:Clarex (registration mark) DR-III C-A DR-90C (day east Resin Industry (strain) system)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
C: nothing
D: the reflecting material made according to following method for making C
(method for making C)
Stir while add following substances, prepare coating fluid, described material comprises: Halshybrid (registration mark) Uv-G720T (acrylic copolymer, the solution of concentration 40%, refractive index 1.56, (strain) Japanese catalyst system) 10.0g, ethyl acetate 24.1g, Tech Polymer (trade mark registration) TRX05S (ponding finished industrial (strain) is made for acrylic compounds spherical particle, refractive index 1.49) 4.0g.Use metal bar #16, in the one side of the white film (Dongli Ltd. Lumirror (registration mark) E6SR) formed at the biaxial stretch-formed PETG by 188 μm of porous by this coating solution, coating layer is set under the drying condition of 120 DEG C, 1 minute.The glossiness of reflecting material is 7.
(comparative example 3).
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A: relief pattern resin plate (with fluorescent tube rectilinear direction parallel direction on the length direction of convex shape is set)
B: nothing
C: nothing
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm).
(comparative example 4)
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A: relief pattern resin plate (with fluorescent tube rectilinear direction parallel direction on the length direction of convex shape is set)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at vertical direction)
C: nothing
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm).
(comparative example 5)
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A:Clarex (registration mark) DR-III C-A DR-70C (day east Resin Industry (strain) system)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
(MNTech Co., Ltd system, is provided with the light diffusing patch of semi-spherical shape projection, haze value: 89.6%) to C:UTE II on top layer
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm)
Lamination order: A/C/B.
(comparative example 6)
In the structure of following A ~ D, evaluate with said apparatus 1,2 and 3.
A:Clarex (registration mark) DR-III C-A DR-70C (day east Resin Industry (strain) system)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
((strain) woody system, is provided with the light diffusing patch of the layer containing particle, haze value: 95.5%) to C1:Light Up 100GM2 on top layer
(3M Inc. has the sheet material of polarised light separation function, haze value: 81.5%) to C2:vikuiti DBEF
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm)
Lamination order: A/C1/B/C2
(comparative example 7)
In the structure of following A ~ D, evaluate with said apparatus 4 and 5.
A:Clarex (registration mark) DR-III C-A DR-70C (day east Resin Industry (strain) system)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
((strain) woody system, is provided with the light diffusing patch of the layer containing particle, haze value: 95.5%) to C1:Light Up 100GM2 on top layer
(3M Inc. has the sheet material of polarised light separation function, haze value: 81.5%) to C2:vikuiti DBEF
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm)
Lamination order: A/C1/B/C2
(comparative example 8)
In the structure of following A ~ D, evaluate with said apparatus 4 and 5.
A:Clarex (registration mark) DRIII C-A DR-70C (day east Resin Industry (strain) system)
B:vikuiti BEFIII 90/50T (3M Inc., convex form: drift angle is the spacing of the triangle at right angle, convex form: 50 μm) (being arranged at parallel direction)
((strain) woody system, is provided with the light diffusing patch of the layer containing particle, haze value: 95.5%) to C1:Light Up 100GM2 on top layer
(3M Inc. has the sheet material of polarised light separation function, haze value: 81.5%) to C2:vikuiti DBEF
D:Lumirror (registration mark) E6QD (east beautiful (strain) system, thickness 188 μm)
Lamination order: A/C1/B/C2.
To provide the characteristic of above-described embodiment, comparative example in following table 1-1 to table 2-2.
[table 2-1]
Table 2-2
Embodiment 1 ~ 11 all presents the inhibition of pipe brightness irregularities.Wherein, when being worth near glossiness each of the haze value of the optical component of fluorescent tube and the fluorescent tube side of reflecting material according to preferable range combination, even if other optical components not stacked, also can killer tube brightness irregularities, and the formation (embodiment 3) of the direct backlight apparatus of high brightness can be obtained.
In addition, by controlling the haze value near the optical component of fluorescent tube, the effect of pipe brightness irregularities suppression and the harmony of brightness can be changed, the formation (embodiment 1,2,4) adapting to various requirement and purposes can be proposed.And then, by using the reflecting material of more low-luster, can killer tube brightness irregularities (contrast of embodiment 5 and embodiment 2, the contrast of embodiment 6 and embodiment 11) further.In addition, by other optical components stacked, can killer tube brightness irregularities further, also can select arbitrarily above-mentioned lamination order, therefore, the multiduty selection scheme (embodiment 5 ~ 11) that direct backlight apparatus is formed can be obtained.And then surprisingly, in most formation, be easy to the more slim of obviousization with pipe brightness irregularities or cut down further the similar device 1,3 of the direct backlight apparatus of the quantity of the fluorescent tube carried, can killer tube brightness irregularities strongly compared with device 2, result has implied direct backlight apparatus and the multiduty application of component devices using it.Particularly in the device 3 that θ angle is large, pipe brightness irregularities is good.
On the other hand, when the glossiness of reflecting material is greater than 5, even if component in addition forms desirable, the inhibition of the pipe brightness irregularities of direct backlight apparatus is insufficient (contrast of the contrast of embodiment 4 and comparative example 1, embodiment 1 and comparative example 2) also.In addition, even if each component selects to have the structure of preferred value or component scheme, but when the length direction of prismatic lens convex shape and the length direction of fluorescent tube are not parallel, pipe brightness irregularities can worsen on the contrary (contrast of embodiment 3 and comparative example 4).When haze value near the optical component of fluorescent tube is greater than specific scope, even if stacked other optical sheets multiple, can not the killer tube brightness irregularities contrast of comparative example 6 (embodiment 9 with) fully.And then, when haze value near the optical component of fluorescent tube is greater than specific scope, even if near other optical sheets that there is mist degree less than 99.0% between the optical component of fluorescent tube and prismatic lens, can not killer tube brightness irregularities (comparative example 5,6) fully.When particularly not configuring prismatic lens, obviously can there is pipe brightness irregularities (contrast of embodiment 3 and comparative example 3).
In addition, distance in the heart in adjacent linear light source is set to L, when distance between from the center of linear light source to the optical component near above-mentioned linear light source is set to H, for the θ meeting following formula (1), when θ is less than 45 ° or θ is greater than 70 °, even if element structure is in addition very desirable, pipe brightness irregularities (contrast of embodiment 3 and comparative example 7) also can be there is significantly.
θ=tan
-1((L/2)/H) ... formula (1)
And then, when θ is less than 45 ° or θ is greater than 70 °, even if when arranging other optical sheet, can not the killer tube brightness irregularities contrast of comparative example 8 (embodiment 5 with) fully.
Utilizability in industry
Direct backlight apparatus of the present invention not only can be preferred for liquid crystal display or LCD TV, and can be used as various area source or lighting device.
Symbol description
1: fluorescent tube (linear light source)
2: the optical component configured near fluorescent tube (linear light source)
3: prismatic lens
4: with the section legend of the convex shape of the length direction configured in parallel of fluorescent tube (linear light source)
5: reflecting material
6: be laminated in other optical sheets below prismatic lens
7: be laminated in other optical sheets above prismatic lens
8: luminance meter
9: the mensuration region of pipe brightness irregularities and brightness
10: the mensuration line of pipe brightness irregularities
Claims (3)
1. a direct backlight apparatus, is characterized in that, described direct backlight apparatus is configured according to the order that reflecting material, multiple linear light source and optical component group are such, and meets following condition (i) ~ (v):
I mode that () described multiple linear light source is parallel to each other with the length direction of each linear light source is configured;
(ii) haze value based on JIS K 7136 (2000) of the optical component near described linear light source in described optical component group is less than 99.0%, and described haze value makes light carry out measuring obtaining from the face incidence of Line of light source;
(iii) there is prismatic lens in described optical component group, described prismatic lens with described Line of light source be opposite side face on be formed with multiple convex shapes along unidirectional extension, the length direction of multiple convex shape is parallel to each other, and the length direction of multiple convex shape is parallel with the length direction of multiple linear light source;
(iv) the 60 ° of glossiness measured based on JIS K 7105 (1981) in the face of the described Line of light source of described reflecting material are less than 5;
V distance in the heart in linear light source adjacent in described multiple linear light source is set to L by (), when distance between from the center of linear light source to the optical component near described linear light source is set to H, the θ meeting following formula (1) is 45 °≤θ≤70 °
θ=tan
-1((L/2)/H) ... formula (1).
2. direct backlight apparatus as claimed in claim 1, wherein, described reflecting material has the resin bed containing particle on the face of wire light source side.
3. direct backlight apparatus as claimed in claim 1 or 2, wherein, described distance H is H≤10mm.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008-230719 | 2008-09-09 | ||
| JP2008230719 | 2008-09-09 | ||
| CN2009801274769A CN102089572A (en) | 2008-09-09 | 2009-09-03 | Directly under backlight device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801274769A Division CN102089572A (en) | 2008-09-09 | 2009-09-03 | Directly under backlight device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104776329A true CN104776329A (en) | 2015-07-15 |
Family
ID=42005142
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801274769A Pending CN102089572A (en) | 2008-09-09 | 2009-09-03 | Directly under backlight device |
| CN201510084602.4A Pending CN104776329A (en) | 2008-09-09 | 2009-09-03 | Directly under backlight device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801274769A Pending CN102089572A (en) | 2008-09-09 | 2009-09-03 | Directly under backlight device |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP5749005B2 (en) |
| KR (1) | KR101597641B1 (en) |
| CN (2) | CN102089572A (en) |
| TW (1) | TWI490605B (en) |
| WO (1) | WO2010029886A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107111014A (en) * | 2015-01-05 | 2017-08-29 | 帝人薄膜解决方案有限公司 | Full run-down type area source white reflection film and the full run-down type area source using the film |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113015900B (en) * | 2018-11-19 | 2024-04-26 | 京瓷株式会社 | Fluid detection sensor and fluid detection device |
| KR102304279B1 (en) | 2020-10-15 | 2021-09-24 | 주식회사 시노펙스 | A backlight unit and manufacturing method thereof |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004029091A (en) | 2002-06-21 | 2004-01-29 | Teijin Chem Ltd | Light diffusion plate for direct backlight made of polycarbonate resin |
| EP1542042A4 (en) * | 2002-07-24 | 2008-07-09 | Yupo Corp | REFLECTING ARTICLE |
| JP4049659B2 (en) * | 2002-11-20 | 2008-02-20 | 株式会社ユポ・コーポレーション | Light reflector |
| TWI288832B (en) * | 2002-11-11 | 2007-10-21 | Samsung Electronics Co Ltd | Prism sheet and fabrication method thereof and liquid crystal display device employing the same |
| JP2004219668A (en) * | 2003-01-14 | 2004-08-05 | Mitsui Chemicals Inc | Optical filter for liquid crystal display device, surface light source device using the same and liquid crystal display |
| JP2004279532A (en) * | 2003-03-13 | 2004-10-07 | Sumitomo Rubber Ind Ltd | Spread plate and light-emitting device |
| KR100808328B1 (en) * | 2003-04-02 | 2008-02-27 | 아사히 가세이 케미칼즈 가부시키가이샤 | Light Diffusing Plate |
| JP4552563B2 (en) * | 2004-08-24 | 2010-09-29 | 日本ゼオン株式会社 | Direct backlight unit |
| JP4770166B2 (en) | 2004-12-10 | 2011-09-14 | 日本ゼオン株式会社 | Direct backlight unit |
| JP2006155926A (en) | 2004-11-25 | 2006-06-15 | Nippon Zeon Co Ltd | Direct backlight unit |
| TWI313380B (en) * | 2005-08-31 | 2009-08-11 | Eternal Chemical Co Ltd | Reflector having high light diffusion |
| WO2008093819A1 (en) * | 2007-02-02 | 2008-08-07 | Dai Nippon Printing Co., Ltd. | Optical sheet, surface light source device and transmissive display device |
-
2009
- 2009-09-03 CN CN2009801274769A patent/CN102089572A/en active Pending
- 2009-09-03 CN CN201510084602.4A patent/CN104776329A/en active Pending
- 2009-09-03 WO PCT/JP2009/065384 patent/WO2010029886A1/en active Application Filing
- 2009-09-03 KR KR1020107028465A patent/KR101597641B1/en not_active Expired - Fee Related
- 2009-09-03 JP JP2010502385A patent/JP5749005B2/en not_active Expired - Fee Related
- 2009-09-08 TW TW098130200A patent/TWI490605B/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107111014A (en) * | 2015-01-05 | 2017-08-29 | 帝人薄膜解决方案有限公司 | Full run-down type area source white reflection film and the full run-down type area source using the film |
| CN107111014B (en) * | 2015-01-05 | 2020-05-19 | 帝人薄膜解决方案有限公司 | White reflective film for direct type surface light source and direct type surface light source using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201015175A (en) | 2010-04-16 |
| CN102089572A (en) | 2011-06-08 |
| KR101597641B1 (en) | 2016-02-25 |
| WO2010029886A1 (en) | 2010-03-18 |
| KR20110063618A (en) | 2011-06-13 |
| JP5749005B2 (en) | 2015-07-15 |
| JPWO2010029886A1 (en) | 2012-02-02 |
| TWI490605B (en) | 2015-07-01 |
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Application publication date: 20150715 |