CN101398508A - Attaching light conducting plate for reducing reflector plate optical attrition - Google Patents
Attaching light conducting plate for reducing reflector plate optical attrition Download PDFInfo
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- CN101398508A CN101398508A CNA2007101806072A CN200710180607A CN101398508A CN 101398508 A CN101398508 A CN 101398508A CN A2007101806072 A CNA2007101806072 A CN A2007101806072A CN 200710180607 A CN200710180607 A CN 200710180607A CN 101398508 A CN101398508 A CN 101398508A
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- guide plate
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Abstract
The invention discloses a bond-typed light guide plate, as well as a display which comprise the light guide plate and a display backlight source; the bond-typed light guide plate comprises a light guide plate, an adhesive layer and an interference-typed reflection sheet; wherein, the thickness of both the light guide plate and the adhesive layer exceeds the diffraction condition; the refractive index of the light guide plate material is more than that of the adhesive layer in the range of the selected wavelength; the light guide plate is provided with a first main surface and a second main surface; the adhesive layer contacts with the second main surface of the light guide plate; the reflection sheet contacts with the other surface of the adhesive layer; the reflection sheet has high reflectivity in the range of the selected wavelength.
Description
Technical field
In general, the present invention relates to light guide plate (lightguide) and comprise the display system of light guide plate.Particularly, the present invention relates to reflector plate is fitted on the light guide plate.
Background technology
Optical display, just becoming more prevalent as LCD (LCD), it is applied to for example mobile phone, the portable computer device from portable personal digital assistant (PDA) to laptop computer, portable digital music player, LCD desktop computer displays and LCD TV.Except that use general more owing to comprise the requirement that the manufacturer of the electron device of LCD proposes littler system dimension, the LCD slimming more that becoming.
Many LCD use the throw light on viewing area of LCD of backlights.Typical backlight comprises the light guide plate of flat board or wedge shape, and described light guide plate is made by technologies such as for example injection mouldings by the transparent polymer material of optical grade usually.In many application, backlight comprises one or more light sources, and the light that described light source will send is coupled (couple) to light guide plate from one or more sides of light guide plate.In flat board or wedge shape light guide plate, the light that is coupled into is propagated in light guide plate by top surface and basal surface total internal reflection in light guide plate usually, causes a part of light some fine structures (features) from the light guide plate outgoing until running into.Many backlights comprise reflector plate, and described reflector plate is used for more effectively utilizing may be from the light of the basal surface outgoing of light guide plate.
Summary of the invention
In general, the present invention relates to the fit type light guide plate.The invention still further relates to the display and the display backlight source that comprise the fit type light guide plate.
In one aspect of the invention, the fit type light guide plate comprises thickness greater than the light guide plate of diffraction conditions, thickness adhesive phase and the interfere type reflector plate greater than diffraction conditions.Thickness has refractive index n greater than the light guide plate of diffraction conditions in chosen wavelength range
g, thickness has refractive index n greater than the adhesive phase of diffraction conditions in chosen wavelength range
AdhIn chosen wavelength range, the refractive index of adhesive phase is less than the refractive index of light guide plate.Light guide plate has first and second first type surfaces, and second first type surface of adhesive phase and light guide plate is fitted.Interfere type reflector plate and adhesive phase are being fitted with the opposite face of light guide plate.The interfere type reflector plate fully is reflected in the light in the chosen wavelength range.
In another aspect of the present invention, backlight assembly comprises and is used to make light to inject the light source of the plane of incidence of fit type light guide plate, and has comprised the combination of optical films of light ringing.The fit type light guide plate comprises thickness greater than the light guide plate of diffraction conditions, thickness adhesive phase and the interfere type reflector plate greater than diffraction conditions.Light guide plate has refractive index n in chosen wavelength range
g, adhesive phase has refractive index n in chosen wavelength range
AdhIn chosen wavelength range, the refractive index of adhesive phase is less than the refractive index of light guide plate.Light guide plate has first and second first type surfaces, and second first type surface of adhesive phase and light guide plate is fitted.Interfere type reflector plate and adhesive phase are being fitted with the opposite face of light guide plate.The interfere type reflector plate fully is reflected in the light in the chosen wavelength range.The combination of optical films (stack) that plays the light ringing is placed on first first type surface of light guide plate.
In another aspect of the present invention, LCD comprises LCD MODULE and backlight assembly.Backlight assembly comprises the light source that is used for light is injected the plane of incidence of fit type light guide plate, and has comprised the combination of optical films of light ringing.The fit type light guide plate comprises thickness greater than the light guide plate of diffraction conditions, thickness adhesive phase and the interfere type reflector plate greater than diffraction conditions.Light guide plate has refractive index n in chosen wavelength range
g, adhesive phase has refractive index n in chosen wavelength range
AdhIn chosen wavelength range, the refractive index of adhesive phase is less than the refractive index of light guide plate.Light guide plate has first and second first type surfaces, and second first type surface of adhesive phase and light guide plate is fitted.Interfere type reflector plate and adhesive phase are being fitted with the opposite face of light guide plate.The interfere type reflector plate fully is reflected in the light in the chosen wavelength range.The combination of optical films (stack) that plays the light ringing is placed on first first type surface of light guide plate.
From following detailed, these and other aspect of the present invention will be tangible.Yet top general introduction must not be understood that the restriction to the claim theme, and this theme is only limited by the appended claim book, and claims are at law and can revise.
Description of drawings
In whole instructions, with reference to the accompanying drawings, represent identical or similar elements at this identical reference marker, and wherein:
Fig. 1 is the schematic cross section of the display of back lighting;
Fig. 2 is the synoptic diagram that is presented at the travel path of the light in the light guide plate;
Fig. 3 is the Optical transmission spectrum figure that shows light guide plate; With
Fig. 4 is the Optical transmission spectrum figure that shows another kind of light guide plate.
Be not necessarily to scale accompanying drawing.The same tag of Shi Yonging refers to identical or similar assembly in the accompanying drawings.Yet, should be appreciated that in given accompanying drawing and to use a mark to represent that parts are not intended to the parts that are limited among another figure with the same tag mark.
Embodiment
The many optical articles of high reflectivity mirror and multi-layer film structures that device uses interfere type of needing.This multi-layer film structure can have cheaply, and production technology realizes, and can be designed in the wavelength coverage of needs, to have high reflectance, the high-responsivity spectral range of the output spectrum of visible spectrum of described wavelength coverage such as human eye or specific light source or specific detector.Described multi-layer film structure can also provide required reflectivity in specific incident angle of light scope.For the incident light of vertical incidence and suitable angle, can obtain excellent reflectivity performance in certain wavelengths even in selected whole wavelength coverage usually.This performance can satisfy the demand of specific terminal applies usually.The interfere type reflector plate is included in those that describe in the following patent as the example of multilayer films interference type reflector plate: United States Patent (USP) 6,208,466 (Liu etc.); 5,825,543 (Ouderkirk etc.); 5,783,120 (Ouderkirk etc.); 5,882,774 (Jonza etc.); 5,612,820 (Shrenk etc.) and 5,486,949 (Shrenk etc.).Described at u.s. patent application serial number 11/691769 for example, in some cases, can use the wide angle mirror system to improve in wide wavelength and the reflectivity in the angular range.
Use for some,, can use birefringence multilayer film reflection that is used for reflect visible light and the part light that spreads into the plane of incidence of light guide plate as the backlight of hand-held display device.A kind of such birefringence multilayer film is to be Vikuiti ESR available from the trade mark of 3M Company
TMThe multilayer films interference type reflector plate of (enhanced specular reflectivity) film.Can obtain optimum performance by the ESR film being positioned over the following of light guide plate and being surrounded, thereby make these backlightly have an acceptable optical property by the medium of low-refraction such as air.Yet if destroyed the low refractive index dielectric condition around the ESR film, for example the ESR film contacts with the other parts of light guide plate or display in upper and lower surface simultaneously, the loss of luminous energy may occur.
This instructions discloses a kind of at display, for example reduces the technology from the optical loss of reflector plate in the hand-held display device.Reduce the luminous energy loss on the light guide plate by using optical adhesive that reflector plate is bonded to.In this way, prevent contacting unintentionally of light guide plate and reflector plate, this contact may produce in contact area owing to the unnecessary light loss that the reflector plate printing opacity forms (light leakage).The optical adhesive that selection has suitable refractive index can reduce or eliminate this unnecessary transmission that takes place on reflector plate, as the interfere type reflector plate.
For this detailed description, " thickness greater than diffraction conditions " material refers to material thickness usually greater than optical wavelength, the particularly bigger order of magnitude, and for example at least 1 micron, and can be hundreds of micron or bigger.The optical property of thickness greater than the optical thin film of diffraction conditions can fully be predicted or describe to geometrical optics, as its reflection and transmission performance.By contrast, interferometric optical can be used for fully being described in the behavior that light is propagated in the thin layer in interfere type blooming such as the multilayer films interference type reflector plate.
The interfere type reflector plate can be made of the alternating layer of inorganic material such as metal or oxide as multilayer films interference type reflector plate, and can be conduction or non-conductive reflector plate.In some cases, multilayer films interference type reflector plate can be made by organic material.In one aspect of the invention, can use refractive index ratio thickness greater than the bonding agent of the lower thickness of the base material of diffraction conditions, polymer multi-layer film interfere type reflector plate such as ESR film are pasted in the substrate such as light guide plate of thickness greater than diffraction conditions greater than diffraction conditions.The light of injecting such as this base material of light guide plate is limited in propagating in the light guide plate owing to total reflection, thereby the unnecessary light loss that transmits the ESR film is minimized.Light is propagated in light guide plate, can by for example with the interaction of described in this manual microstructure (extractionfeatures), on needed position, light is drawn light guide plate.
According to the difference of surrounding medium, incide the light on multilayer films interference type reflector plate such as ESR surface, may leak.Along with incident angle increases from the direction perpendicular to the surface (0 ° of incident angle) of multilayer films interference type reflector plate, can reach " leakage angle ".For the detailed description of this paper, leak the angle that the angle is meant in this angle or major part incides the luminous energy generation transmission on the multilayer films interference type reflector plate during greater than this angle.In the incident angle less than the leakage angle, most of light is by the surface reflection of multilayer films interference type reflector plate.Leak the angle and can depend on medium and incident light wavelength around material in the multilayer films interference type reflector plate and thicknesses of layers, the reflector plate.When the refractive index around the multilayer films interference type reflector plate increases, leak the angle and significantly reduce (that is, multilayer films interference type reflector plate leaks more incident light).Two outside surfaces that should be noted that multilayer films interference type reflector plate can be in the different dielectric material of refractive index.The leakage angle of reflector plate may be subjected to the influence of each different materials; Yet, if a kind of material is an air, in multilayer films interference type reflector plate, propagating and incide the light on the air surface, can on surface, reflect with high leakage angle.
The leakage angle of multilayer films interference type reflector plate reduces (by being immersed in the higher medium of refractive index), can produce adverse influence to the brightness and the homogeneity of display.For example, when the ESR film with backlight in light guide plate generation optical significance on contact the time, originally total reflection (F-TIR) can't take place in the light with big angle normal propagation in light guide plate, thereby is coupled in the ESR film.Unless another kind of object also comes in contact with another surface that the ESR film in the optically-coupled zone takes place, otherwise this coupling can not produce very big influence.Another kind of object can be a part, a slice dust, liquid or any other chip of display outer frame.When this thing happens, the light that is coupled in the ESR film can transmit ESR, and loses at the back side of display.This optical loss can produce dim spot and reduce the homogeneity of display.
In some cases, light guide plate and ESR film reflector plate separate by the clearance in display backlight, and can use the interval body (spacer) around light guide plate to keep the clearance.Yet interval body possibly can't be kept the clearance always, and some chips also may enter the gap between light guide plate and the reflector plate.This chip may cause optically-coupled and light to leak, thereby causes display dim spot and destruction homogeneity to occur.In addition, light guide plate and reflector plate may move independently of each other, and may deform or warpage.May cause reflector plate and light guide plate to be in contact with one another by the warpage that for example temperature variation caused, thereby cause that light leaks.In some cases, the variation of humidity and static also may cause optically-coupled and light to leak.
The present invention uses refractive index (n
Adh) less than the refractive index (n of light guide plate
g) thickness greater than the adhesive phase of diffraction conditions interfere type reflector plate such as ESR film are pasted on the light guide plate of thickness greater than diffraction conditions.Can select suitable refringence to make the light of all injecting light guide plate basically remain in the light guide plate, and can be not enter the ESR film greater than the incident angle of leaking the angle.Can also select n
Adh, make the light that is recycled (for example, from prism film, as Vikuiti
TMBrightness Enhancement Film " BEF " or Thin Brightness Enhancement Film " TBEF ", or reflective polarizer such as Vikuiti
TMDual Brightness Enhancement Film " DBEF " can be available from 3M Company) by after light guide plate and the adhesive phase, can be inciding on the ESR film less than the angle of leaking the angle, thus make it by once more towards display reflects.
Light guide plate can have the size or the shape of any needs, and can have homogeneous thickness such as flat board, maybe can be to have certain inclination angle, as wedge shape.This light guide plate can be applied in the backlight of the LCD (LCD) in for example mobile phone, laptop computer, TV or other application.Microstructure can be able to be designed on the front surface of light guide plate or other light guide plate or on the position in the light guide plate so that light in the light guide plate to the liquid crystal board that will be illuminated or other parts outgoing.
Described light guide plate can have microstructure on a side relative with the reflector plate of fitting, thereby makes light be directed to the observer with predetermined angle.Can in for example United States Patent (USP) 6,845,212 (Gardiner etc.) and 7,223,005 (Lamb etc.), find the example of microstructure, and in US application serial No. 11/421,241, also can find.Microstructure can be to be designed to make groove, lenslet (lenslet) or other microstructure of light from the light guide plate outgoing.Can use several method that microstructure is produced on the light guide plate, described method includes but not limited to: casting, embossing, littlely duplicate, print, ablation, etching and other method as known in the art.
The present invention also provides light guide plate and reflector plate with the form of single parts, as the fit type light guide plate, thereby reduces the quantity of backlight parts and assembler's backlight cost.Light guide plate fitted to prevent on the reflector plate that chip from entering between two surfaces and cause in the defective aspect the show uniformity.Suitably select light guide plate and bonding agent refractive index can keep the propagation efficiency of light in light guide plate, and prevent that light is to enter reflector plate greater than the angle of leaking the angle.The applying of two parts can also reduce the warpage of each parts, thereby improves environmental performance and stability.
For this detailed description, chosen wavelength range (for example can be represented visible light or near visible, the 400-700nm wavelength), near infrared light (for example, 700-1000nm, 700-1400nm or 700-5000nm, the detecting device or the propagation medium of use depended in the selection of wavelength coverage sometimes) or visible and a near infrared light combination or their part.Other scope also can be the wavelength coverage of selecting.For example, if use the fit type light guide plate in the system with narrow emission device such as LED or laser instrument, then chosen wavelength range can narrower (for example, 100nm, 50nm, 10nm or littler).For in illuminator that is used for LCD (LCD) or other display such as fit type light guide plate that backlight uses, chosen wavelength range can wideer (for example, 400-800nm, 400-900nm, 400-1000nm, 400-1200nm, 400-1400nm, 400-1600nm or 400-1700nm).
Multilayer films interference type reflector plate typically is made up of tens of, hundreds of or thousands of layers of microstructure, and these microbeddings are made up of the form that alternates with optical material " a " and " b ", for example the quarter-wave film heap.Optical material " a, b " can be the known any suitable material that has application in the inteferometer coating pile structure, and no matter it is inorganic (as TiO
2, SiO
2, the material that is fit to of CaF or other), still organically, polymkeric substance (for example, PEN (PEN), polymethylmethacrylate (PMMA), polyethylene terephthalate (PET), acrylic compounds and other material that is fit to) for example.Described multilayer film can have the structure that full-inorganic material, full organic material or inorganic/organic material mix mutually.Described multi-layered film body can comprise more material, and is not only material " a, b ", for example can comprise other material " c ", " d " etc. in laminated body.Rete can be isotropic, also can be the birefringence rete, or the combination of isotropy microbedding and birefringent layers.Multilayer film with birefringence can be used for: symmetrical reflecting system can reflect the vertical incidence light of any polarization state substantially the samely; Or the asymmetric reflection system, have high reflectance for a kind of vertical incidence light of polarization state and have lower reflectivity for the vertical incidence light of the polarization state of quadrature.
The optical thickness of every layer film (physical thickness multiply by refractive index) is usually less than an optical wavelength.These retes are arranged with the form in cycle, are called optical repeat unit (ORU), for example wherein the optical thickness of ORU be in chosen wavelength range light wavelength 1/2nd.These retes make the constructive interference of light or the destructive interference possibility that becomes, and the long mutually or destructive interference of described light is to cause the reflection of multilayer film and the transmission performance reason with wavelength shift.ORU can be double-layer structure " ab ", but other arrange also can, as at United States Patent (USP) 5,103, the arrangement of argumentation among 337 (Schrenk etc.), 3,247,392 (Thelen), 5,360,659 (Arends etc.) and 7,019,905 (Weber).When needed, gradual change can take place to widen the reflection wavestrip in the optical thickness of ORU on the thickness dimension of multilayer film.Described multi-layer film structure is not must be smooth or plane in its gamut, it can be shaped if desired, molded or be embossed with molded non-planar.Yet, can think that at least partially film layer structure is arranged essentially parallel to local x-y coordinate plane.
In some cases, can be by the suitable alternate material of selective refraction rate, the thickness distribution and the rete sum of every layer film, obtain having for example multilayer film of following characteristic: the zone of reflections extends in whole visible range, and extend to the near-infrared region, has precipitous left and right sides band edge, and (and for some application, also in whole near-infrared region) has at least 70%, 80%, 90% or higher average reflectance in whole visible-range at least.But the Vikuiti that utilize birefringence multi-layer film structure of reference example as selling by 3M company
TMEnhanced Specular Reflector (ESR) film.ESR can have the reflectivity greater than 98% in whole visible-range.
Multilayer film can be made up of polymkeric substance fully, and can be by the preparation of co-extrusion platen press and pulling method causing suitable birefringence in microbedding, thereby improves reflectivity.In some cases, multilayer film can comprise or all be made up of inorganic material, and can prepare by vacuum evaporation technology.For the birefringence multilayer film that uses inorganic material, with reference to United States Patent (USP) 6,590,707 (Weber).
We turn to Fig. 1 now, and Fig. 1 has shown an embodiment of the display with backlight 200 according to an aspect of the present invention.Display 200 with backlight comprises backlight module 250 and LCD module 260.Backlight module 250 comprises backlight 220 and optionally has the several layers of combination of optical films 240 of light ringing, and described combination of optical films 240 with light ringing is set between backlight 220 and the LCD module 260.
Thickness can be made by glass or polymeric material such as thermoplasticity or thermosetting polymer greater than the light guide plate 212 of diffraction conditions.In some cases, be applicable to that thickness is polycarbonate greater than the thermoplastics of the light guide plate 212 of diffraction conditions, but can use any thermoplastic polymer with suitable transmittance performance.Thickness can be homopolymer, multipolymer or polymer blend greater than the light guide plate 212 of diffraction conditions.The refractive index of polymer blend is commonly referred to " effective refractive index ", and this refractive index can be used determination of experimental method.For the disclosure, thickness is refractive indexes in the surface measurement of light guide plate greater than the refractive index of the light guide plate 212 of diffraction conditions.In some cases, thermosets can be used for the light guide plate 212 of thickness greater than diffraction conditions as radiation curable acrylates or methacrylate etc.Thickness can be flexible light-conducting plate or rigidity light guide plate greater than the light guide plate 212 of diffraction conditions.For example in the u.s. patent application serial number 11/421,241 the flexible light-conducting plate is being described.
Enter thickness greater than the light of the side 211 of the light guide plate 212 of diffraction conditions with the form of emergent light 230 from backlight 220 outgoing, and be directed to combination of optical films 240 with light ringing.Combination of optical films 240 with light ringing is used for further regulating entering the light of LCD module 260, and more effectively utilizes light to have the brightness and the homogeneity of the display 200 of backlight with raising.Emergent light 230 leaves backlight 220 and enters the combination of optical films 240 with light ringing from front surface 222.Combination of optical films 240 can comprise the BEF prism film 244 of pair of intersecting, and the prism facets of prism film 244 is towards LCD module 260.As shown, combination of optical films can also comprise optional diffusion sheet 242 and optional DBEF reflective polarizer 246, and they are positioned in the both sides of crossing BEF prism film 244.Optional diffusion sheet 242 can be placed between crossing the BEF prism film 244 and backlight 220.In some cases, the combination of optical films 240 that optionally has the light ringing can comprise the diaphragm that other is used for further regulating light in addition, as diffusion sheet, optical filter etc.The a part of emergent light 230 that enters the combination of optical films 240 with light ringing can transmit this combination of optical films on the direction of LCD module 260.Another part emergent light 230 that enters combination of optical films 240 passes front surface 222 as recycle light 235 and turns back in the backlight 220.As described elsewhere, recycle light 235 enters the front surface 222 of fit type light guide plate 210, and propagates greater than the light guide plate 212 of diffraction conditions by thickness.Recycle light 235 finally by reflector plate 216 again secondary reflection forward the surface 222.
Can use the adhesive phase 214 of several dissimilar thickness, for example dry film hot-melt adhesive, dry film contact adhesive, radiation curing adhesive or solvent-based adhesive assembling fit type light guide plate 210 greater than diffraction conditions.Thickness is greater than the refractive index of the adhesive phase 214 of the diffraction conditions refractive index less than light guide plate 212.In some cases, the difference of refractive index is greater than 0.005, for example greater than 0.01,0.1,0.2 or more than.
Described bonding agent can form between light guide plate 212 and reflector plate 216 continuously or lipostrat.In some cases, thickness can guarantee the homogeneity of display greater than the successive layers of the bonding agent 214 of diffraction conditions, and improves performance backlight.For this detailed description, " successive layers " refers to this layer cladding thickness is greater than the light guide plate 212 of diffraction conditions and the whole space between the reflector plate 216 basically, and " lipostrat " refers to do not covered by this layer greater than the light guide plate 212 of diffraction conditions and some part at least in the space between the reflector plate 216 at thickness.In some cases, for example by thickness greater than the light guide plate 212 of diffraction conditions or reflector plate 216 on the discontinuous pattern of adhesive of deposition, can make thickness discontinuous greater than the bonding agent 214 of diffraction conditions.In some cases, can use uniform discontinuous pattern of adhesive, as be evenly distributed on a plurality of bonding agent parts on the light guide plate.In some cases, discontinuous coating is being discontinuous in the scope of light guide plate size, and when using light guide plate, the pattern of adhesive phase is sightless.
Fig. 2 has shown the light path that light is propagated in fit type light guide plate 210.As in Fig. 2 by L
0Shown in, light source 218 is injected into the side 211 of thickness greater than the light guide plate 212 of diffraction conditions with light with a plurality of angles.Thickness is greater than the side 211 of the light guide plate 212 of diffraction conditions and the air formation interface of refractive index n=1.Be injected into the light L in the light guide plate 212
0In light guide plate 212 with critical angle θ less than the normal of side 211
CgAngle begin to propagate.For the sake of simplicity, only discuss those light of propagating greater than the interface between the bonding agent 214 of diffraction conditions 213 greater than the light guide plate 212 and the thickness of diffraction conditions towards thickness below, described light shows with light L in Fig. 2.However, it should be understood that the light injected also can propagate towards the front surface 222 of light guide plate 212, at front surface 222 through total reflections, and light guide plate 212 in continuation with critical angle θ less than the normal of side 211
CgAngular spread.
As shown in FIG. 2, some among the light L are as light l
1Reflect back in the light guide plate 212 by TIR.Among the light L some are as light l
2Be refracted in the adhesive phase 214.By θ
Cga=arcsin (n
Adh/ n
g) obtain the critical angle at interface 213, and the refractive index of light guide plate 212 is greater than the refractive index of adhesive phase 214.Light l
1With greater than θ
CgaAngle and interface 213 intersect, therefore be reflected back in the light guide plate 212 of thickness greater than diffraction conditions.Light l
2With less than θ
CgaAngle and interface 213 intersect, therefore be refracted in the bonding agent 214 of thickness greater than diffraction conditions.At front surface 222 is under the situation of air interface, light l
1Thickness greater than the light guide plate 212 of diffraction conditions in angular spread greater than the critical angle at two interfaces, therefore experience total reflection in greater than the light guide plate 212 of diffraction conditions at thickness.
In some cases, the light that incides interface such as front surface 222 this at or near the interface with the microstructure that trips out light action (in Fig. 2, not showing), thereby cause at least a portion light from the form outgoing of light guide plate with the emergent light shown in Fig. 1 230.Can to be that other places are disclosed in this manual draw any in the feature to the microstructure that can cause the light outgoing.For example, microstructure can be positioned at the inside of front surface 222, interface 213, light guide plate 212 or their combination.
Described light can be at thickness greater than hundreds of times of light guide plate 212 internal reflections of diffraction conditions.Thus, the light L that injects in the light guide plate reflects that part of (l that enters in the adhesive phase 214 when intersecting for the first time
2) can be the sub-fraction in whole light of in light guide plate, propagating.Be refracted to the light l in the adhesive phase 214
2Be transmitted to reflector plate 216 by adhesive phase 214, and reflect to front surface 222 by this reflector plate.
If the relative index of refraction of each layer is followed total relation: (refractive index of light guide plate 212) 〉=(lowest refractive index in reflector plate 216) 〉=(refractive index of adhesive phase 214), then light l
2Sheet 216 reflections can be reflected.Under the situation that does not satisfy inequality, a part of light l
2Can transmission pass reflector plate 216, particularly with the dielectric ring of non-air during around reflector plate 216 both sides.
With light L
0The mode that enters edge 211 is similar, and recycle light 235 enters the front surface 222 of light guide plate 212 with a plurality of angles.The front surface 222 and the air of light guide plate 212 also form the interface, so light is at the critical angle θ of the normal of front surface 222
CgTo propagate in the inherent light guide plate 212.Part recycle light 235 can be at the interface 213 experience TIR, and another part can enter in the adhesive phase 214 so that the described mode of light L is refracted.Yet, because θ
Cg＜θ
Cga, major part will be refracted in the adhesive phase 214 of thickness greater than diffraction conditions, reflect to front surface 222 by the reflector plate reflection then.
To describe exemplary in following illustrative embodiment now, in described embodiment, unless otherwise indicated, otherwise all parts and number percent are by weight.
Embodiment
Embodiment 1: from the optical loss that uses and do not use the polycarbonate light guide plate of lamination
The optical adhesive that use～3mil (.075mm) is thick (the Opt-1 laminating adhesive is also referred to as Bonding Systems Division 9483 bonding agents, can available from 3M Company), the film-type polycarbonate light guide plate (LEXAN that 20mil (0.51mm) is thick
Polycarbonate membrane 8010 can be available from GE Polymershapes, Seattle WA) paste a slice Vikuiti ESR
TMOn the film (can available from 3MCompany).The refractive index of polycarbonate light guide plate is 1.586, and the refractive index of described optical adhesive is 1.47.Use desk-top (benchtop) laminating machine (Catena35 can be available from General BindingCorporation, Northbrook IL), fit with 1.5 feet per minute clocks (0.76cm/ second) in room temperature.Then with the applying sample with the film-type polycarbonate light guide plate of not fitting cutting is wide into about 6cm and sample 30cm length is used for test.
Use light source and integrating sphere to measure total optical loss of the applying sample and the sample of not fitting (because leakage, absorption and scattering).Use the laser of beam expander expansion 543nm, by cylindrical lens it is become parallel beam then, focus on then on the light guide plate edge.Catch by integrating sphere and to pass the long light guide plate of 30cm and by the light of its distal edge outgoing.Use is connected to the photodetector measured light intensity on the integrating sphere.Then film is cut down 5cm, and repeat this process until the only remaining 10cm of initial 30cm.Use following relationship computed losses coefficient: loss factor=(log10 (I
X/ I
0))/(optical path length X), wherein I
XBe the intensity that the continuous 5cm part back of each excision records by integrating sphere, I
0Be the intensity that when sample only is left 10cm, records, and X is the total length when measuring each time by integrating sphere.For in the sample of not fitting and fitting any one, total optical loss is measured and is repeated twice.The loss of measuring in the sample of not fitting and fitting equates basically, thereby shows not owing to the ESR film being fitted to the significant optical loss that causes on the polycarbonate light guide plate.
Repeat above-mentioned total optical loss experiment then, difference is to use led light source to replace laser instrument.Led light source by from Nokia 7270 mobile phones (can be available from Nokia Group, four LED that take out in Finland) form.LED is arranged side by side in device and several millimeters of spaces.Condition driving LED light source with 13.7V and 20mA.Total optical loss measurement shows not owing to the ESR rete being pressed onto the significant optical loss that causes on the polycarbonate light guide plate.
Embodiment 2: the transmitted spectrum that posts the polycarbonate light guide plate of ESR film
Use can be posted the transmitted spectrum of the polycarbonate light guide plate of ESR film available from Lambda 900 spectrophotometers of Perkin/Elmer in different incident angle measurements.This embodiment proof is pressed onto the remarkable reduction that can not cause ESR film reflectivity on the polycarbonate light guide plate with the ESR rete.The light that incides in each sample is entered by the surface of the polycarbonate thin plate relative with the ESR film.In the visible range of 400nm-700nm, measure the transmissivity of each sample.The spectrum of the applying sample of embodiment 1 under 0,15,30,45,60 and 75 ° of incident angle is shown among Fig. 3.The not applying sample of embodiment 1, ESR film are suspended in sample bottom surface (that is, do not fit, but replace the clearance), and the spectrum under 0,15,30,45,60 and 75 ° of incident angle is shown among Fig. 4.Under big incident angle, transmitted spectrum is towards indigo plant-green light spectrum one side offset slightly, but the reflectivity of the ESR film after fitting does not significantly reduce.
Embodiment 3: brightness and the homogeneity of using the back light system that fits to the ESR on the polycarbonate light guide plate
Utilize thick polycarbonate membrane (Panlite 1151, can be, Alpharetta GA) to be processed into the thick light guide plate of two 15mil (381 microns) available from Teijin Kasei.Two light guide plate have identical microstructure (extractor) on a surface so that light can the 32mm x 40mm zone on light guide plate outgoing.According to the method for describing in embodiment 1, used thickness fits to the ESR film on one of them light guide plate in a side relative with microstructure greater than the OPT-1 bonding agent of diffraction conditions.
Each light guide plate is positioned in the aluminium shell, described aluminium shell has along first opening at an edge of light guide plate, be used to accept light from light source, and light guide board microstructure one side towards direction on have second opening that about 32mm is wide and 40mm is long.Light source is 4 side-emitting LEDs describing in embodiment 1, and the condition of work of described LED is 13.7V and 20mA, with first register.Light guide plate is fixed at aluminium shell inner side edge.
Cover three optical thin films on second opening in aluminium chassis: a diffusion sheet (the scatter-type polycarbonate can be available from GE Polymershapes, Seattle WA) and two crossing prism films (TBEF and BEF-II, all can available from 3M Company).Not the light guide plate of fitting with the ESR film thereunder place one can unmanaged flexibility the ESR film.
The imaging system (PM-1600, can available from Radiant Imaging Inc., Duvall WA) that is used to measure luminosity is placed in second opening top, and the spatial brightness of measuring light guide plate distributes.Use some survey type nitometer (PR-650 can be available from Photo Research Inc., Chatsworth CA) calibration brightness.
The brightness and the homogeneity of these light guide plate are compared mutually.The brightness of the light guide plate of applying ESR film and homogeneity are than having the sample difference big 23% and 14% of not fitting.
Unless otherwise indicated, otherwise should think that all numerals of used representation feature size, amount and physical property are modified by speech " pact " in this instructions and claim.Therefore, unless opposite explanation is arranged, the digital parameters of mentioning in above-mentioned explanation and appended claim book all is an approximate value, and the performance that can look for the needs of acquisition according to those skilled in the art of use instruction disclosed herein changes.
Except that the content that may directly conflict with content of the present invention, all clearly be attached in the content of the present invention by reference at this at all lists of references that this quotes and the full content of publication.Although at this for example and described specific embodiments, it should be appreciated by those skilled in the art that under the situation of the scope that does not depart from content of the present invention multiple replacement and/or equivalent embodiments can replace specific embodiments shown and description.The application is intended to cover any modification or the variation of the specific embodiments of this argumentation.Therefore, be intended that the restriction that the present invention only is subjected to claims and equivalent thereof.
Claims (20)
1. fit type light guide plate, it comprises:
Has first first type surface and at second first type surface of the first first type surface opposite face, thickness is greater than the light guide plate of diffraction conditions;
Fit with second first type surface of light guide plate, thickness is greater than the adhesive phase of diffraction conditions, and in chosen wavelength range, refractive index is less than the refractive index of light guide plate; With
Fit and the interfere type reflector plate relative with light guide plate with described adhesive phase, reflector plate has high reflectance in chosen wavelength range.
2. the described fit type light guide plate of claim 1, wherein said interfere type reflector plate comprises multilayer films interference type reflector plate.
3. the described fit type light guide plate of claim 2, wherein said multilayer films interference type reflector plate comprises polymer multi-layer film interfere type reflector plate.
4. the described fit type light guide plate of claim 3, wherein said polymer multi-layer film interfere type reflector plate comprises Enhanced Specular Reflector blooming.
5. the described fit type light guide plate of claim 1, wherein said thickness is successive layerss greater than the adhesive phase of diffraction conditions.
6. the described fit type light guide plate of claim 1, wherein said thickness is non-successive layerss greater than the adhesive phase of diffraction conditions.
7. the described fit type light guide plate of claim 6, wherein said lipostrat is discrete uniformly.
8. backlight assembly, it comprises:
Has first first type surface and at second first type surface of the first first type surface opposite face, thickness is greater than the light guide plate of diffraction conditions;
Be placed on the combination of optical films that plays the light ringing on first first type surface of described light guide plate;
The thickness of fitting with second first type surface of described light guide plate is greater than the adhesive phase of diffraction conditions, and in chosen wavelength range, the refractive index of described bonding agent is less than the refractive index of described light guide plate; With
Fit with described adhesive phase and at the interfere type reflector plate of described thickness greater than the light guide plate opposite side of diffraction conditions, described reflector plate fully is reflected in the luminous energy in the described chosen wavelength range; With
Light is injected the light source of described thickness greater than the light inlet side of the light guide plate of diffraction conditions.
9. the described backlight assembly of claim 8, wherein said interfere type reflector plate comprises multilayer films interference type reflector plate.
10. the described backlight assembly of claim 9, wherein said multilayer films interference type reflector plate comprises polymer multi-layer film interfere type reflector plate.
11. the described backlight assembly of claim 10, wherein said polymer multi-layer film interfere type reflector plate comprises Enhanced Specular Reflector blooming.
12. the combination of optical films that the described backlight assembly of claim 8, the combination of optical films of wherein said light ringing comprise at least one diffusion sheet, a prism film, a reflective polarizer and be made up of these bloomings.
13. the described backlight assembly of claim 8, the combination of optical films of wherein said light ringing comprise diffusion sheet, two prism film, reflective polarizers that prism direction intersects successively, and wherein diffusion sheet are close to first first type surface of light guide plate.
14. the described backlight assembly of claim 8, wherein at least a portion can be reflected combination of optical films to described light ringing by described interfere type reflector plate once more by the light of the combination of optical films of described light ringing reflection.
15. the described backlight assembly of claim 8, wherein said light source comprises at least one light emitting diode.
16. the described backlight assembly of claim 8, wherein said light source comprises at least one cold-cathode fluorescence lamp.
17. a LCD, it comprises:
LCD MODULE;
The combination of optical films that play light ringing adjacent with described LCD MODULE;
The thickness adjacent with the combination of optical films of described light ringing is greater than the light guide plate of diffraction conditions, described thickness greater than the light guide plate of diffraction conditions have first first type surface adjacent with the combination of optical films that plays the light ringing and with the first first type surface opposite second major surface;
The thickness that fits greater than second first type surface of the light guide plate of diffraction conditions with described thickness is greater than the adhesive phase of diffraction conditions, and in chosen wavelength range, the refractive index of described bonding agent is less than the refractive index of described light guide plate;
With the interfere type reflector plate that described adhesive phase is fitted, described reflector plate fully is reflected in the light in the described chosen wavelength range; With
Be used for light is injected the light source of described thickness greater than the light inlet side of the light guide plate of diffraction conditions.
18. the described LCD of claim 17, wherein said interfere type reflector plate comprises multilayer films interference type reflector plate.
19. the described LCD of claim 18, wherein said multilayer films interference type reflector plate comprises polymer multi-layer film interfere type reflector plate.
20. the described LCD of claim 19, wherein said polymer multi-layer film interfere type reflector plate comprises Enhanced Specular Reflector blooming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101806072A CN101398508A (en) | 2007-09-30 | 2007-09-30 | Attaching light conducting plate for reducing reflector plate optical attrition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101806072A CN101398508A (en) | 2007-09-30 | 2007-09-30 | Attaching light conducting plate for reducing reflector plate optical attrition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101398508A true CN101398508A (en) | 2009-04-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101806072A Pending CN101398508A (en) | 2007-09-30 | 2007-09-30 | Attaching light conducting plate for reducing reflector plate optical attrition |
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| CN (1) | CN101398508A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798925A (en) * | 2011-05-27 | 2012-11-28 | 奇美电子股份有限公司 | Display and light guide plate thereof |
| CN103115325A (en) * | 2011-11-16 | 2013-05-22 | 扬升照明股份有限公司 | light guide plate module, manufacturing method thereof and light source device |
| CN103148370A (en) * | 2013-01-30 | 2013-06-12 | 苏州百纳思光学科技有限公司 | Large-size LED (light emitting diode) panel lamp with novel light guide plate |
| CN105607179A (en) * | 2016-01-27 | 2016-05-25 | 青岛海信电器股份有限公司 | Display apparatus |
| CN108139514A (en) * | 2015-09-18 | 2018-06-08 | 沙特基础工业全球技术公司 | Flexible bragg reflector |
| CN108279534A (en) * | 2015-04-16 | 2018-07-13 | 青岛海信电器股份有限公司 | A kind of side entering type display module and display device |
| CN111381309A (en) * | 2018-12-31 | 2020-07-07 | 现代自动车株式会社 | Backlight unit for flat lighting device with improved flexibility and method of manufacturing the same |
-
2007
- 2007-09-30 CN CNA2007101806072A patent/CN101398508A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798925A (en) * | 2011-05-27 | 2012-11-28 | 奇美电子股份有限公司 | Display and light guide plate thereof |
| CN103115325A (en) * | 2011-11-16 | 2013-05-22 | 扬升照明股份有限公司 | light guide plate module, manufacturing method thereof and light source device |
| CN103148370A (en) * | 2013-01-30 | 2013-06-12 | 苏州百纳思光学科技有限公司 | Large-size LED (light emitting diode) panel lamp with novel light guide plate |
| CN108279534A (en) * | 2015-04-16 | 2018-07-13 | 青岛海信电器股份有限公司 | A kind of side entering type display module and display device |
| CN108139514A (en) * | 2015-09-18 | 2018-06-08 | 沙特基础工业全球技术公司 | Flexible bragg reflector |
| CN105607179A (en) * | 2016-01-27 | 2016-05-25 | 青岛海信电器股份有限公司 | Display apparatus |
| CN111381309A (en) * | 2018-12-31 | 2020-07-07 | 现代自动车株式会社 | Backlight unit for flat lighting device with improved flexibility and method of manufacturing the same |
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Open date: 20090401 |