CN102478187A - Display backlight module and manufacturing method thereof - Google Patents
Display backlight module and manufacturing method thereof Download PDFInfo
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- CN102478187A CN102478187A CN2010105696340A CN201010569634A CN102478187A CN 102478187 A CN102478187 A CN 102478187A CN 2010105696340 A CN2010105696340 A CN 2010105696340A CN 201010569634 A CN201010569634 A CN 201010569634A CN 102478187 A CN102478187 A CN 102478187A
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Abstract
The invention provides a display backlight module and a manufacturing method thereof, and particularly proposes a multi-layer film reflecting piece consisting of a plurality of layers of high polymer films which have different refractive indexes and are overlapped with one another. The multi-layer film reflecting piece is arranged in a backlight module of a liquid crystal display and is designed to reflect or perforate light rays with a specific wavelength range by using the principle of interferometry, and more uniform backlight can be obtained. The display backlight module comprises a backlight source module, such as a straight down type or lateral light source, and the multi-layer film reflecting piece and an optical film module, wherein the optical film module can comprise an optical film for brightness enhancement and diffusion.
Description
Technical field
The present invention relates to a kind of display backlight module and its manufacturing approach, particularly relate to a kind of backlight module that comprises the multilayer film reflector plate that an adjustable light source wave-length coverage is set.
Background technology
The backlight module that is applied to LCD (LCD) panel can be divided into side direction type (edge type) and straight-down negative (direct type) according to light-source structure.
The structure of side direction type light source as shown in Figure 1; Light source itself possibly be
negative electrode fluorescent tube (CCFL); Or light emitting diode (LED), be arranged at the panel side.The side direction type backlight module that Fig. 1 shows is arranged at display panels 101 belows; Backlight module generally includes the prismatic lens (prism) 102 that helps the light diffusion, the diffusion barrier (diffuser) 103 that helps equalizing light rays and the LGP (light guide plate) 104 of wedge type; 105 of light sources are located at a side of LGP 104, and the below has and can light be reflected the reflecting piece (reflector) 106 that gets into panel in the backlight module.
Wherein, Light is sent by light source 105; Light is interspersed among in the integral display panel through LGP 104, descending light can get in the panel through reflecting piece 106 reflections, and up light then can see through the optical system of diffusion barrier 103 and prismatic lens 102 combinations with equalizing light rays; Wherein diffusion barrier 103 can reduce the uneven problem of light and shade that the light interference produces, and makes that the panel that gets into display panels 101 can uniformly light-emitting.Each optical element wherein, like diffusion barrier 103, LGP 104, its surface or innerly can see through particle or structure that manufacturing approach produces some diffusion usefulness, penetration and refraction principle let light more show mixed and disorderly and promote the effect of homogenising.
Fig. 2 is shown as the direct type backlight module sketch map of prior art.Direct type backlight module is that light sources such as CCFL or light emitting diode are directly placed display panels 201 belows, and direct type backlight module includes prismatic lens 202, diffusion barrier 203 that helps equalizing light rays and the lamp box 204 with light source 205 and reflective structure 206 that helps the light diffusion.Be different from the side direction type light source; Directly-down light source then can be directly with light directive display panels 201; For asking uniform light source; Also need optical elements such as prismatic lens, diffusion barrier equally, the surface of optical element or inside also are the particle or the structures that can produce some diffusion usefulness through manufacturing approach.
In the prior art, each optical element that is applied in the backlight module can be with reference to United States Patent (USP) the 7th, 763, the optical module of the display that is disclosed for No. 331, and relevant indicators can be with reference to figure 3.
Show a liquid crystal indicator 30 in this example; Wherein main element is the backlight optical module of liquid crystal panel 301 and its below; Then comprise the light source 308 of blooming 303, brightness enhancement film (brightness enhancingfilm) 305, LGP 307 and one of which side in the optical module, LGP 307 belows then have a reflector 309 in order to reflect descending light.
Wherein blooming 303 can be diffusion barrier, reflection polarizing film or another brightness enhancement film, and brightness enhancement film can be the structure blast or all uses with the blast of polarisation way of recycling or both.In this example; Brightness enhancement film 305 is arranged between LGP 307 and the liquid crystal panel 301; In general; Liquid crystal panel 301 upper and lower surfaces have light polarizing film, and light arrives light polarizing film through above-mentioned blooming 303, LGP 307; To have consume, the brightness enhancement film of being made up of the reflection multilayer light polarizing film 305 (like DBEF, cholesterol liquid crystal (cholesteric liquidcrystal) brightness enhancement film, metal grating (metal wire grid) brightness enhancement film, branch light brightness enhancement film (prismaticbrightness enhancement film)) then helps to improve backlight illumination and can save energy loss.
Prior art:
LGP 104
Reflecting piece 106
Blooming 303
LGP 307
Inventive embodiments:
Display panels 401
Brightness enhancement film 403
Diffusion barrier 405
Backlight module 40
Multilayer film reflector plate 407
Side direction type light source 408
LGP 409
Reflecting piece 410
Diffuser plate 406
Display panels 501
Brightness enhancement film 503
Diffusion barrier 505
Multilayer film reflector plate 507
Diffuser plate 506
Direct-light-type backlight module 509
Light source 508
Reflector 510
Multilayer film reflector plate 61
LGP 62
Reflecting piece 64
Diffusion particle 708,708 ', 709
Base material 711,712
Polymeric optical film 701,701 ', 703,703 ', 705,705 ', 707,707 '
Step S601～S607 backlight module manufacturing step
Step S801～S807 multilayer film reflector plate manufacturing step
Summary of the invention
Be the solution that provides to be different from optical element in the prior art backlight module; The present invention proposes a kind of backlight liquid crystal display module that is applied to; Comprising the backlight module that side direction type or straight-down negative are arranged, on an exiting surface of backlight module, a multilayer film reflector plate is set especially also; The multilayer film reflector plate has different refractivity by multilayer and the high molecular polymer film that is superimposed with each other is formed; One side then is pasted with a blooming module, and in one embodiment, the blooming module has brightness enhancement film at least; Like brightness enhancement film (BEF) or reflective brightness enhancement film (DBEF), cholesterol liquid crystal (cholesteric liquid crystal) brightness enhancement film, metal grating (metal wire grid) brightness enhancement film, and can include diffusion barrier.
According to embodiment, above-mentioned multilayer film reflector plate is arranged in the backlight liquid crystal display module, and the principle of interference designing institute that can see through wherein utilization will reflect or penetrate the light with particular range of wavelengths, and can obtain backlight more uniformly.
The embodiment of display backlight module comprises a backlight module, like the straight-down negative or the light source of side direction type, comprises an above-mentioned multilayer film reflector plate and a blooming module again, and this blooming module can have the blooming of blast and diffusion.
With regard to light source; The present invention can be applicable to the direct-light-type backlight module that light source is a light emitting diode matrix especially; And this light emitting diode matrix can be main by a plurality of white lights; Also can select especially to form by the light emitting diode of many group patterns pattern; Comprise that many group red, green, blue three colour cells are closed, the combination of blue light-emitting diode and yellow fluorescent powder, the backlight of the light-emitting component composition of the light emitting diode of multicolor phosphors such as ultraviolet light-emitting diodes and RGB encapsulation composition or the light emitting diode of other types.
The manufacturing approach of aforementioned display device backlight module is then mainly purchased a display panels earlier, and a blooming module is set afterwards, makes it to be incorporated on the surface of display panels, includes diffusion barrier and brightness enhancement film in the blooming module at least.
Then be provided with by the multilayer film reflector plate that multilayer has different refractivity and the high molecular polymer film that is superimposed with each other is formed, fit with the blooming module.Backlight module is set at last.
Specifically, the multilayer film reflector plate can be by a coextrusion made, also can be through a uniaxial extension, form one have polarisation (polarization) effect optical element.Or extend through twin shaft, can control the P polarization and the ratio of S polarization thus through the light of multilayer film reflector plate, perhaps controlledly be made for approaching no polarization state.
In another embodiment, can also see through coating on the surface of multilayer film reflector plate and form a surface texture, maybe can have a plurality of diffusion particles.
Description of drawings
Shown in Figure 1 is the structural representation of the side direction type backlight module of prior art;
Fig. 2 is shown as the direct type backlight module sketch map of prior art;
Fig. 3 is shown as prior art and is applied to the backlight liquid crystal display module diagram;
Fig. 4 is a display backlight module embodiment sketch map of the present invention;
Fig. 5 is a display backlight module embodiment sketch map of the present invention;
Shown in Figure 6 for the manufacturing approach flow chart of display backlight module of the present invention;
Fig. 7 A and Fig. 7 B are depicted as the structure embodiment sketch map of multilayer film reflector plate of the present invention;
Fig. 8 is shown as the manufacturing approach of multilayer film reflector plate embodiment of the present invention.
Wherein, description of reference numerals is following:
The specific embodiment
In general backlight liquid crystal display module, be provided with the blooming that adds lustre to, increases diffusion, increases the uniformity usually, such as 3M
TMThe brightness enhancement film of company (BEF) and reflective brightness enhancement film (DBEF), cholesterol liquid crystal (cholesteric liquid crystal) brightness enhancement film, metal grating (metal wire grid) brightness enhancement film; Or some utilize multilayer film to form the blooming of multipath reflection optical path, or utilize surface texture to produce the optical texture of diffusion function.
The present invention proposes a kind of display backlight module and its manufacturing approach; Being different from operated by rotary motion has the mode of optical elements such as bright enhancement film, diffuser plate; Be provided with one especially by multilayer has different refractivity and the high molecular polymer film that is superimposed with each other is formed multilayer film reflector plate; Wherein use principle of interference, can see through design alternative institute and will reflect or penetrate light with particular range of wavelengths, backlight more uniformly with acquisition.
The film of above-mentioned high molecular polymer can be selected from group or copolymer or the mixture that following polymer substance is formed: ethylene glycol terephthalate (Polyethylene Terephthalate; PET), polycarbonate (Polycarbonate, PC), Triafol T (Tri-acetyl Cellulose, TAC), polymethyl methacrylate particle (Polymethylmethacrylate; PMMA), MS plastic cement (Methylmethacrylate styrene), polypropylene (Polypropylene; PP), polystyrene (Polystyrene, PS), polymethyl methacrylate (PMMA) or cyclenes copolymer (CyclicOlefin Copolymer, COC), PEN (Polyethylene Naphthalate; PEN); Polyvinyl fluoride (Ethylene-Tetrafluoroethylene, ETFE), PLA (Polylactide; PLA), coPEN, coPET, wherein coPET and coPEN then for part PET and part PEN according to copolymer that certain proportion mixed.
According to the embodiment of the invention; The backlight module that is arranged at the display panels below includes backlight module and which floor optical element; Such as diffusion barrier and brightness enhancement film; And backlight module can include side direction type backlight module and direct-light-type backlight module, and the multilayer film reflector plate is arranged on the exiting surface of LGP in the side direction type backlight module especially.
Can be with reference to the display backlight module embodiment sketch map of the 4th figure demonstration; This example is shown as the backlight module of a side direction type, and main element includes the blooming module (comprising brightness enhancement film 403, diffusion barrier 405) and a backlight module 40 of display panels 401 belows.
In this example, backlight module 40 is the side direction type backlight.Above-mentioned have 407 of the multilayer film reflector plates that the different refractivity film is superimposed with each other by multilayer and be arranged on the exiting surface of this backlight module 40, is the part of backlight module 40.
Side direction type backlight module 40 primary structures comprise multilayer film reflector plate 407, side direction type light source 408, LGP 409 and reflecting element, and reflecting element is in particular the reflecting piece 410 that shows among the figure.Wherein LGP 409 is coupled to side direction type light source 408, and 410 of reflecting piece are arranged at a side of LGP 409, and multilayer film reflector plate 407 then is arranged at the opposite side of LGP 409, just on the exiting surface of backlight module 40.
In this type of backlight module 40; Seeing through LGP 409 inner designs with surface texture effectively guides light source 408 to get into backlight module 40; When the light of light source 408 gets into LGP 409; Light possibly comprise up light and a descending light, and the light traveling process is towards up directive multilayer film reflector plate 407, and descending light then need receive back reflection by reflecting piece 410 and get in the module.In another embodiment; Also can be provided with a diffuser plate 406 on the exiting surface in the backlight module 40, diffuser plate 406 main purposes are to provide support and provide all effects of light, diffuser plate 406 materials generally can be PC or PMMA, MS, PS, etc. material; About 500um～the 6mm of thickness; Diffuser plate 406 can be a structural type or can be the diffuser plate that adds granule proliferation, and diffuser plate 406 combines with multilayer film reflector plate 407, can produce better evenly effect.
Specifically; Definition one reflecting chamber between multilayer film reflector plate 407 in the backlight module 40 and the reflecting piece 410; Light can produce multipath reflection, refraction and scattering in this cavity, increase light path and the purpose of reaching color mixed light and light intensity distributions space homogenising whereby.
Another directly-down light source can be with reference to display backlight module embodiment sketch map of the present invention shown in the 5th figure.
Wherein be shown as each optical element under the display panels 501, wherein the blooming module has brightness enhancement film 503 at least or/and diffusion barrier 505, with diffuser plate 506; Multilayer film reflector plate 507 is then arranged; The below then is provided with direct-light-type backlight module 509, and comprising light source 508 reflecting element in the backlight module therewith, the reflecting element of direct-light-type backlight module 509 can be illustrated reflector 510; Reflector 510 is coupled to light source 508, is used for reflecting descending light and gets into backlight module.
In this example, multilayer film reflector plate 507 and reflecting element, just and 510 of reflectors in the backlight module 509 definition, one reflecting chamber, light can produce multipath reflection, refraction and scattering in this cavity, increase light path and the purpose of reaching homogenising whereby.
Specifically; The light source of this direct-light-type backlight module can be a light emitting diode matrix; The preferred embodiment light emitting diode matrix that light-emitting component that many groups have the red, green, blue Tricolor LED is formed of serving as reasons is not got rid of the light emitting diode of other types yet.
There is multilayer to have the optical thin film of different refractivity in the above-mentioned multilayer film reflector plate, after the light that is sent by backlight module gets into the multilayer film reflector plate, with producing a plurality of optical paths that repeatedly reflect and penetrate; Because structure is thinner; Can the too many energy of loss, except producing the effect of equalizing light rays, also can use principle of optical interference to select reflection or penetrate light with particular range of wavelengths; The light of specific wavelength section is passed through, or make the light reflection of other wavelength sections.
In another embodiment, in the manufacturing process of above-mentioned multilayer optical film, can add the ultraviolet light reflecting layer of light reflection ultraviolet (UV) especially,, and can when extruding, make or be coated on other optical thin films in order to the unnecessary ultraviolet light of reflection by the light source generation.In this embodiment, be different from the practice that other use the material of absorbing ultraviolet light, this ultraviolet light reflecting layer can be reflected by light emitting diode, laser diode (Laser diode), the cold-cathode tube ultraviolet lights that light source produced such as (CCFL), and can utilize again.When light source is semiconductor light sources such as laser diode or light emitting diode, can also utilize function that several layers of optical thin film can the usable reflection ultraviolet lights to promote the efficient of light emitting diode.Common main semiconductor white light source mainly contains following three kinds of modes at present: one, for forming the white-light emitting module with red bluish-green Tricolor LED crystal grain; Have high-luminous-efficiency, high color rendering advantage; But also different because of different colours crystal grain brilliant material of heap of stone simultaneously, the related voltage characteristic that makes is also different thereupon.Therefore make that cost is higher, control circuit complex design and mixed light be difficult for.Two, propose with blue light-emitting diode to excite yellow YAG (Y3A15O12:Ce for a day inferior chemistry; Yttrium-aluminium-garnet) fluorescent material produces white light emitting diode, is existing market main flow mode.Japan's day inferior chemical white light emitting diode of being developed; Be to fill the optical cement that is mixed with gold-tinted YAG fluorescent material in the periphery of blue light-emitting diode wafer; The wavelength of this blue light-emitting diode blue light that wafer sends is about 400nm-530nm, and the light that utilizes the blue light-emitting diode wafer to be sent excites gold-tinted fluorescent material to produce sodium yellow.But the blue light that also has part simultaneously emits, and this part blue light cooperates goes up the sodium yellow that fluorescent material is sent, and promptly forms the white light of blue yellow two wavelength that mix.Yet this white light emitting diode that utilizes blue light-emitting diode wafer and gold-tinted phosphor combination to form has following several deficiencies: one, because blue light accounts for the major part of luminescent spectrum, therefore, have the higher and uneven phenomenon of colour temperature.For these reasons, must improve the chance of blue light and the effect of gold-tinted fluorescent material, to reduce the blue light strength or the intensity of raising gold-tinted.Two,, and then cause the control of white light source color to be difficult for because the blue light-emitting diode emission wavelength can change with temperature increase.Three, because of luminous red spectrum a little less than, cause the relatively poor phenomenon of color rendering (color rendition).
The another kind of mode that obtains white light be with ultraviolet excitation or ultraviolet light-emitting diodes excite contain in the transparent optical cement be mixed with a certain proportion of blueness, green, red fluorescence powder equably, can obtain the white light that three-wavelength mixes after exciting.Three wavelengh white light light-emitting diode has the high color rendering advantage, but the not enough shortcoming of luminous efficiency is arranged.At present white light LEDs forms with the fluorescent material collocation with ultraviolet light (UV) or blue light wafer, and its drawback is that luminosity is not enough difficult with uniformity control.Industrial quarters is to increase light transmittance and to derive or draw out the problem that more how available luminous quantity solves the light-emitting diode luminance deficiency from crystal grain at present.For example use transparent conductive material with the amount of light that increases crystal grain, change crystal grain crystalline substance of heap of stone or electrode structural designs so that draw out more how available luminous quantity.
When using ultraviolet leds to make the light source of excited white light,, must ultraviolet light be denial in the white-light LED structure and block ultraviolet light to leak outside in addition because of the injury to human eye more in short-term of ultraviolet light wavelength is big more.Be not the absorbent that absorbing ultraviolet light is set in the multilayer film reflector plate of the present invention; But the function that the ultraviolet light reflecting layer can just reach increases optical efficiency is set in the multilayer film reflector plate; Especially have especially for the white light LEDs that ultraviolet leds inspired that uses high color rendering and directly benefit; This technology is arranged at can be increased the LED luminous efficiency and promote back light source brightness in the backlight in the liquid crystal display device module, and can reduce led color improves color to the susceptibility of variations in temperature stability.
For instance; If light source is the combination of ultraviolet light-emitting diodes (LED) and redgreenblue fluorescent material; Above-mentioned ultraviolet light reflecting layer can reflect back into the ultraviolet light that light source produces in the backlight module, and row reflects and goes out again, not only can not influence other optical elements; Also can reuse and excite LED fluorescent material, also can increase the luminous efficiency of LED.The above-mentioned utilization in the mode that ultraviolet excitation produces white light; The part of fluorescent material can suitably add can be by the composition of ultraviolet excitation; That is to say; Blending together white light generally will have two primary colours, and the frequency spectrum (excitation spectrum) that excites of the fluorescent material in this example contains more than two crests at least, just possibly excited the generation white light by the ultraviolet light except the light of script light emitting diode.
Other optical elements, the blooming module like diffusion barrier and brightness enhancement film etc. then can be incorporated on the multilayer film reflector plate surface, can present light uniformly through the light of multilayer film reflector plate.Diffusion barrier mainly is to see through its surface texture or particle, or built-in granule proliferation in the manufacturing approach, or the chaotic path that gets into light of mode of air entrapment etc., produces the effect of diffusion.Brightness enhancement film then is to utilize multilayer film to produce reflection, penetrate and cause the effect of adding lustre to, and can have the function of polariscope in addition.
The manufacturing approach flow chart of display backlight module then can be with reference to the 6th figure.
Step begins like S601, purchases a display panels, then is provided with the blooming module in the panel surface below, wherein can comprise multiple blooming, as is provided with one and has brightness enhancement film such as the 3M that adds lustre to the polarisation effect
TMThe BEF of company or DBEF (step S603), and setting makes the homodisperse diffusion barrier of light source (step S605).
Side at backlight module and each optical element is provided with backlight module (step S607) afterwards; Backlight module is installed on a side of the device of display panels, the formation of blooming module; Wherein can be have LGP (62), the side direction type backlight module of light source (63) and reflecting piece (64); Be pasted with multilayer film reflector plate (61) especially
Backlight module in conjunction with the multilayer film reflector plate will use the principle of interference design reflectivity or penetrate the light with particular range of wavelengths.According to demand, backlight module can be directly-down light source equally, and the multilayer film reflector plate then is attached on the exiting surface.
The structure of multilayer film reflector plate is the high low-refraction order stack of multilayer and closes and form, like polymeric optical film (701,701 ' superimposed among Fig. 7 A, Fig. 7 B; 703,703 ', 705; 705 ', 707,707 '); And in fact the inner layer high molecule blooming of the multilayer film reflector plate number of plies of being piled up can be by tens of layers more than hundreds of layers, and only illustrate sandwich construction in scheming, hundreds of layers the structure of not drawing.Multi-layer film structure forms interference condition, can make light therein through repeatedly reflection row ejaculation again, and the effect of homogenising light source is arranged; Also can and go out, the effect of adding lustre to is arranged the capable again reflection of the light that reflects.Change its optical characteristics through extension degree in integral multi-layered film reflector plate thickness, material and the manufacturing approach, can design according to actual demand.The characteristic of multilayer film reflector plate can be adjusted according to demand especially, particularly after single shaft or twin shaft extend, can make its light in the penetrance of spectrum 400nm～700nm between 30% and 90%.
When light source is made up of multiple color; As using by the multi-colored led light source of forming of RGB; The normal uneven color spot phenomenon of colour mixture that takes place; Be called moire (MURA), the multilayer film reflector plate can utilize single shaft or twin shaft to extend the ratio that can effectively adjust P and S polarization state, also can only utilize twin shaft to extend the light that adjustment produces no polarization state; When light will just can increase the briliancy uniformity of backlight module and the uniformity reduction MURA phenomenon of color effectively with the light light path lengthening of each light source during interreflection among multilayer film reflector plate and reflector plate and optical module.
The multilayer film reflector plate is except above-mentioned multi-layer film structure; In another embodiment; Also comprise the ultraviolet light reflecting layer that utilizes coextrusion or coating to make; Wherein can add the light-passing plastic particle or the additive of light reflection ultraviolet and make this ultraviolet light reflecting layer, make it to be formed in the multilayer film reflector plate.Other manufacturing approach also can comprise with multilayer film sputter (sputtering) or vapor deposition (evaporation) ultraviolet light film fits with the multilayer film reflector plate on this multilayer film reflector plate or after being plated on the base material again; Make part ultraviolet luminous energy reflected by the multilayer film reflector plate; Being provided with of ultraviolet light reflecting layer can be the one or both sides at the multilayer film reflector plate; Or, can reach and to excite the needed ultraviolet light wave band of fluorescent material of all kinds by light reflection ultraviolet LED in the inside of multilayer film reflector plate.
In the manufacturing approach; Specifically, when the multilayer film reflector plate forms, can pass through the single shaft direction or the extension of biaxially oriented again; Comprise machine or manual tension; Make inner high molecular strand and alignment structure change, change its physical characteristic, the parameter of extension comprises the temperature of extension, the orbital path that extends speed, extension ratio, extension and thermosetting temperature and time (heat setting) etc.
As after utilizing uniaxial extension (uniaxial extension multiplying power can reach 1.5 to 6 times, even bigger multiplying power is looked demand and thin-film material and decided); Wherein thin-film material comprise ethylene glycol terephthalate (Polyethylene Terephthalate, PET), polycarbonate (Polycarbonate, PC), Triafol T (Tri-acetyl Cellulose; TAC), polymethyl methacrylate particle (Polymethylmethacrylate; PMMA), MS plastic cement (Methylmethacrylate styrene), polypropylene (Polypropylene, PP), polystyrene (Polystyrene, PS), polymethyl methacrylate (PMMA) or cyclenes copolymer (Cyclic Olefin Copolymer; COC), PEN (Polyethylene Naphthalate; PEN), and polyvinyl fluoride (Ethylene-Tetrafluoroethylene, ETFE); PLA (Polylactide, PLA).Optical element behind uniaxial extension can have the polarisation effect of specific direction, and can adjust the wavelength of light scope of its polarization whereby.
(twin shaft extends the diaxon extension ratio can be inequality if twin shaft extends; Also can be twin shaft or twin shaft extension simultaneously in regular turn); Except adjusting the wave-length coverage, can also control through the P polarization of the light of multilayer film reflector plate and the ratio of S polarization, also can tune near no polarization state.And can cooperate with the characteristic of other bloomings (like above-mentioned diffusion barrier and bright enhancement film), make whole backlight module have more homogenising, diffusion, color difference eliminating, adjustment polarization state, adjustment reflectivity, reduce moire (MURA) and can utilize principle of interference to adjust the light of particular range of wavelengths.
Embodiment sees also Fig. 6 A and Fig. 6 B again, and it is depicted as the structure embodiment sketch map of multilayer film reflector plate of the present invention.
Fig. 7 A shows the multilayer film reflector plate outside structuring polymer optical thin film 701,703,705,707, and (being defined as first surface) gone up to utilize and extruded or be coated with (coating) formation surface texture 70 in a surface.Surface texture 70 generally can be length or width is formed between the microstructured bodies of 5um～100um approximately; The microstructured bodies shape of forming surface texture 70 often is spherical (sphere), hemispherical, rhombus (prism) or pyramid (pyramid) etc., or is made up of the various structures that can spread light.The distribution of microstructured bodies can become even or chaotic uneven distribution; To avoid producing folded line phenomenon (Moir é pattern) when overlapping with other elements; The function of surface texture 70 be can be chaotic the optical path of light after penetrating, increase light path, can increase the light uniformity.Also can in the manufacturing approach of making surface texture 70, increase diffusion particle 708 in addition; Increase the diffusivity of light; Diffusion particle 708 can be selected from the macromolecule of acrylic, silica or titanium dioxide and so on; Purpose is to cause light refraction and scattering through different refractivity difference, and the shape of particle also can have strip or approaching oval or circular, and diffusion particle 708 can be mixed in the employed optical cement of coating inside.
Fig. 7 B then shows multilayer film reflector plate polymeric optical film 701 ', 703 ', 705 '; 707 ' both sides utilize optical cement (optical glue) applying base material 711,712, comprise the above-mentioned first surface and the second surface of opposite side; Make surface texture 70 ', 72 all to see through coating, and in like manner can form diffusion particle 708 ' simultaneously in both sides up and down; 709, can increase the diffusivity of multilayer film reflector plate whereby.In this example; Surface texture 70 (the lamination capable of using of can fitting of top; Lamination) diffusion barrier in display backlight module of the present invention or other bloomings; Form holistic optical element, such as on the first surface of multilayer film reflector plate, attaching first diffusion barrier, on second surface, attach second diffusion barrier, and in optical elements such as first diffusion barrier and second diffusion barrier, all can have a plurality of diffusion particles.
The above-mentioned base material 711 that is used to form surface texture; 712 as the plastic rubber materials that support the multilayer film reflector plate structures, its can be polycarbonate (PC), polypropylene (Polypropylene, PP), PS plastic cement (Polystyrene; PS), polymethyl methacrylate (PMMA), MS plastic cement (Methylmethacrylate styrene), the blue or green butadiene styrene (ABS) of propylene, PETG (PET), polyacetals plastic cement (Polyoxymethylene; POM), nylon (Nylon), PEN (Polyethylene Naphthalate, PEN), or PET and PEN the certain proportion CoPEN or the CoPET polyvinyl fluoride (Ethylene-Tetrafluoroethylene that blend together; ETFE); (Polylactide PLA) waits material, but does not exceed with above-mentioned PLA.
The 8th figure is shown as the manufacturing approach of multilayer film reflector plate embodiment of the present invention.
Like step S801; Utilize coextrusion (co-extrusion) to make the multilayer film reflector plate that forms by the layer high molecule film; Wherein capable of using one or many extruders respectively the macromolecular material of multiple different materials to be delivered into a co-extrusion die head inner, after extruding, can experience cooling and shaping, draw and step such as get and block; Like step S803, form the multilayer film reflector plate.
Can before extruding back, typing, adopt on the line (online) uniaxial extension or after off-line (offline) is received film, carry out a uniaxial extension, the optical element that formation one has the polarisation effect therebetween; Or on the line or the off-line execution twin shaft extend; With control through the P polarization of the light of this multilayer film reflector plate and the ratio of S polarization; Or form and do not have a multilayer film reflector plate (step S805) of characteristic of polarisation; Extend and change multilayer film reflector plate physical characteristic, generation can be to the optical element of particular range of wavelengths light reflection, and the extension ratio according to single shaft or twin shaft changes polarization effect simultaneously.At last, also can on the multilayer film reflector plate, form surface texture (step S807), the blooming that the mode of formation surface texture 807 can comprise coating or another structure of signing an undertaking of fitting is on laminated reflective film.
Comprehensive foregoing, the display backlight module that the present invention proposes also have the multilayer film reflector plate that is formed by stacking by multilayer different refractivity film except the blooming module with diffusion, polarization and light enhancing effect, following a few specific character is arranged:
1. can be controlled in the penetrance and the reflectivity of particular range of wavelengths; Can cause definition one reflecting chamber between the reflecting piece (reflector) of light in this multilayer film reflector plate and backlight module; Light can produce physical phenomenons such as multipath reflection, refraction, scattering in this cavity; Increase the path of mixed light whereby, reach the function of homogenising;
2. the penetrance of multilayer film reflector plate can be changed by the multiple condition of the material of plural layers, thickness, extension;
3. through control reflectivity and penetrance, after diffusion barrier collocation use, can adjust the state of the MURA of light source, ability auxiliary diffuser plate and LGP increase inhomogeneity function, make this display backlight module produce more uniform light;
4. can also adjust laminated reflective film through uniaxial extension; Make the light under different polarization states have different reflectivity and refractive index; Through reflectivity and the penetrance of adjusting this multilayer film reflector plate; If can arrange in pairs or groups other optical thin films,, can adjust the brightness and the uniformity like the DBEF of 3M company;
5. alternative is made one deck ultraviolet light reflecting layer in the multilayer film reflector plate; With the unnecessary ultraviolet light of reflection by the light source generation; Make it and to utilize again, excite the light ray energy of the specific composition generation specific band in specific light source such as the LED fluorescent material, to increase the luminous efficiency of light source.
The above is merely preferred possible embodiments of the present invention, but not in order to limit claim of the present invention.Therefore protection scope of the present invention also should comprise various replacement and the modifications that do not deviate from specification of the present invention and diagramatic content, and is as the criterion with the scope that appending claims was defined.
Claims (38)
1. a display backlight module is applied in the liquid crystal indicator, it is characterized in that described display backlight module comprises:
One side direction type backlight module comprises:
One light source;
One LGP is coupled to this light source;
One reflecting piece is arranged at a side of this LGP, in order to reflect the descending light that this source light gets into this LGP; And
One multilayer film reflector plate; Be arranged on the exiting surface of this side direction type backlight module; Have different refractivity and the high molecular polymer film that is superimposed with each other is formed by multilayer, wherein use a principle of interference design reflectivity or penetrate light with particular range of wavelengths; Definition one reflecting chamber between this multilayer film reflector plate and this reflecting piece, light produces multipath reflection, refraction and scattering in this reflecting chamber; And
One blooming module is arranged between this a side direction type backlight module and the display panels, wherein has a brightness enhancement film and a diffusion barrier at least.
2. display backlight module according to claim 1 is characterized in that on a first surface or the second surface of described multilayer film reflector plate coating or extrudes a surface texture.
3. display backlight module according to claim 2 is characterized in that this surface texture of described multilayer film reflector plate also includes a plurality of diffusion particles.
4. display backlight module according to claim 2 is characterized in that being pasted with diffusion barrier on this first surface or this second surface of described multilayer film reflector plate.
5. display backlight module according to claim 4 is characterized in that this diffusion barrier on described first surface or this second surface has a plurality of diffusion particles.
6. display backlight module according to claim 1 is characterized in that also comprising in the sandwich construction of described multilayer film reflector plate a ultraviolet light reflecting layer of light reflection ultraviolet.
7. display backlight module according to claim 1 is characterized in that described multilayer film reflector plate is for made through a uniaxial extension.
8. display backlight module according to claim 7 is characterized in that described multilayer film reflector plate behind this uniaxial extension, in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
9. display backlight module according to claim 1 is characterized in that described multilayer film reflector plate is for extending made through a twin shaft.
10. display backlight module according to claim 9 is characterized in that described multilayer film reflector plate after extending through this twin shaft, in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
11. display backlight module according to claim 1 it is characterized in that described multilayer film reflector plate is made for extending through a twin shaft, and the multilayer film reflector plate has polarized light property.
12. display backlight module according to claim 1 it is characterized in that described multilayer film reflector plate is made for extending through a twin shaft, and the multilayer film reflector plate does not have polarized light property.
13. a display backlight module is applied in the liquid crystal indicator, it is characterized in that described display backlight module comprises:
One direct-light-type backlight module comprises:
One light source;
One reflector is coupled to this light source, in order to reflect a descending light of this source light; And
One multilayer film reflector plate; Be arranged on the exiting surface of this direct-light-type backlight module; Have different refractivity and the high molecular polymer film that is superimposed with each other is formed by multilayer, wherein use a principle of interference design reflectivity or penetrate light with particular range of wavelengths; Definition one reflecting chamber between this multilayer film reflector plate and this reflector, light produces multipath reflection, refraction and scattering in this reflecting chamber; And
One blooming module is arranged between this direct-light-type backlight module and the display panels, wherein has a brightness enhancement film and a diffusion barrier at least.
14. display backlight module according to claim 13, the light source that it is characterized in that described direct-light-type backlight module is a light emitting diode matrix.
15. display backlight module according to claim 14; It is characterized in that described light emitting diode matrix by many groups of light emitting diode, laser diodes, or the light-emitting component of the light emitting diode of the light emitting diode of blue-light excited fluorescent material or ultraviolet excitation multicolor phosphor is formed with red, green, blue three looks.
16. display backlight module according to claim 13 is characterized in that on a first surface or the second surface of described multilayer film reflector plate coating or extrudes a surface texture.
17. display backlight module according to claim 16 is characterized in that this surface texture of described multilayer film reflector plate also includes a plurality of diffusion particles.
18. display backlight module according to claim 16 is characterized in that being pasted with diffusion barrier on this first surface or this second surface of described multilayer film reflector plate.
19. display backlight module according to claim 18 is characterized in that this diffusion barrier on described first surface or this second surface has a plurality of diffusion particles.
20. display backlight module according to claim 13 is characterized in that also comprising in the sandwich construction of described multilayer film reflector plate a ultraviolet light reflecting layer of light reflection ultraviolet.
21. display backlight module according to claim 13 is characterized in that described multilayer film reflector plate is for made through a uniaxial extension.
22. display backlight module according to claim 21 is characterized in that described multilayer film reflector plate behind this uniaxial extension, in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
23. display backlight module according to claim 13 is characterized in that described multilayer film reflector plate is for extending made through a twin shaft.
24. display backlight module according to claim 23 is characterized in that described multilayer film reflector plate after extending through this twin shaft, in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
25. display backlight module according to claim 13 it is characterized in that described this multilayer film reflector plate is made for extending through a twin shaft, and the multilayer film reflector plate has polarized light property.
26. display backlight module according to claim 13 it is characterized in that described multilayer film reflector plate is made for extending through a twin shaft, and the multilayer film reflector plate does not have polarized light property.
27. the manufacturing approach of a display backlight module is characterized in that described manufacturing approach comprises:
Purchase a display panels;
One blooming module is set, is incorporated on the surface of this display panels, wherein comprise a diffusion barrier and a brightness enhancement film at least; And
One backlight module is set, has a light source and a reflecting element, be installed on a side of the device of this display panels and this blooming module formation;
Wherein an exiting surface of this backlight module is provided with a multilayer film reflector plate; This multilayer film reflector plate has different refractivity by multilayer and the high molecular polymer film that is superimposed with each other is formed, and wherein uses a principle of interference design reflectivity or penetrates the light with particular range of wavelengths; Definition one reflecting chamber between this reflecting element and this multilayer film reflector plate, light produces multipath reflection, refraction and scattering in this reflecting chamber.
28. the manufacturing approach of display backlight module according to claim 27 is characterized in that described multilayer film reflector plate is by a coextrusion made.
29. the manufacturing approach of display backlight module according to claim 28 is characterized in that described multilayer film reflector plate also through a uniaxial extension, the optical element that formation one has the polarisation effect.
30. the manufacturing approach of display backlight module according to claim 29 is characterized in that, this multilayer film reflector plate of making through this uniaxial extension in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
31. the manufacturing approach of display backlight module according to claim 27 is characterized in that described multilayer film reflector plate also extends through a twin shaft, with control through the P polarization of the light of this multilayer film reflector plate and the ratio of S polarization.
32. the manufacturing approach of display backlight module according to claim 31 is characterized in that, extend through this twin shaft this multilayer film reflector plate of making in the average penetration rate of spectrum 400nm～700nm between 30% and 90%.
33. the manufacturing approach of display backlight module according to claim 27 is characterized in that described backlight module is a side light type back light source module.
34. the manufacturing approach of display backlight module according to claim 27 is characterized in that described backlight module is a direct-light-type backlight module.
35. the manufacturing approach of display backlight module according to claim 34; The light source that it is characterized in that described direct-light-type backlight module is a light emitting diode matrix; This light emitting diode matrix has the red, green, blue Tricolor LED by many groups, the light emitting diode of blue-light excited fluorescent material or formed with the light-emitting component of the light emitting diode of light emitting diode, laser diode or the other types of ultraviolet excitation multicolor phosphor.
36. the manufacturing approach of display backlight module according to claim 27 is characterized in that also forming a surface texture with a coating on the surface of described multilayer film reflector plate.
37. the manufacturing approach of display backlight module according to claim 36 is characterized in that described surface texture has a plurality of diffusion particles.
38. the manufacturing approach of display backlight module according to claim 27 is characterized in that also comprising in the sandwich construction of described multilayer film reflector plate a ultraviolet light reflecting layer that utilizes a coextrusion, coating, sputter or vapor deposition to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105696340A CN102478187A (en) | 2010-11-24 | 2010-11-24 | Display backlight module and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105696340A CN102478187A (en) | 2010-11-24 | 2010-11-24 | Display backlight module and manufacturing method thereof |
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| CN102478187A true CN102478187A (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010105696340A Pending CN102478187A (en) | 2010-11-24 | 2010-11-24 | Display backlight module and manufacturing method thereof |
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Application publication date: 20120530 |