CN105511012A - Light guide structure for implementing polarization collimation surface light sources - Google Patents
Light guide structure for implementing polarization collimation surface light sources Download PDFInfo
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- CN105511012A CN105511012A CN201610103109.7A CN201610103109A CN105511012A CN 105511012 A CN105511012 A CN 105511012A CN 201610103109 A CN201610103109 A CN 201610103109A CN 105511012 A CN105511012 A CN 105511012A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0056—Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
Abstract
The invention discloses a light guide structure for implementing polarization collimation surface light sources. The light guide structure comprises a light guide structure body, an incident polarization light source and a micro-lens array group. Light rays emitted by the incident polarization light source are reversely transmitted into a quarter-wave plate under the effects of concave dimming screen dots arranged at a light emergent surface, are modulated twice and are collimated by parabolic reflection micro-lenses, and the high-polarization collimation surface light sources in polarization states perpendicular to original polarization states can be ultimately formed at the light emergent surface. The light guide structure has the advantages that the efficient polarization collimation surface light sources can be implemented, the light guide structure is high in integration level, particularly suitable for application with requirements on surface light sources and favorable for thinning designs of system structures and is compact, and processing techniques are easy to implement.
Description
Technical field
The present invention relates to light optics field, be particularly suitable for the application needing polarization collimation plane light source, and be conducive to the highly integrated design of system architecture.Especially, can apply on the backlight module of liquid crystal display.
Background technology
In recent years, along with the further expansion of lighting demand, social every field is more and more harsher for the requirement of lighting quality and lighting system structure, and the illumination optics that can realize diversification target has more wide application prospect.For liquid crystal display, liquid crystal panel itself is passive luminescence, and need the special structure of design to provide the area source of polarized incident for it, backlight module, as a kind of guiding distribution module of light, is assisted liquid crystal panel to realize final even light display and shown.The backlight module being common in liquid crystal display mainly comprises the parts such as light source, reflector plate, light guide plate, diffusion barrier, bright enhancement film.Backlight module mainly contains side-light type structure and two kinds, straight-down negative structure by its scale.Side-light type structure has lightening feature, and light source is positioned over the edge of module by this structure, is derived uniformly by light by the design of light guide plate surface microstructure from front, and is controlled in the angular field of view selected by light by diffusion barrier and brightening piece.Straight-down negative structure does not need light guide plate, and LED array is directly arranged in the bottom of backlight body, and by the mixed light of certain altitude, the light that each LEDs sends also can form a uniform light energy distribution at the top of backlight body, realizes uniform.Sum up these two kinds of traditional structures to be not difficult to find, although they can both realize uniform area source bright dipping, but in system, all include multilayer independence diaphragm, this is also unfavorable for the realization of the integrated of system and slimming, such as, the light reflection appeared from light guide plate lower surface can return in light guide plate by reflector plate, improves the utilization factor of luminous energy; The effect of diffusion barrier is that fill light line distributes, and reduces the difference of bright dark space as far as possible, makes the distribution of light more even; Prismatic lens is then assembled by the light beam of scattering, usually also sticks bright enhancement film, to improve the front face brightness in angular field of view.
In order to improve the efficiency of light energy utilization and to integrated, slimming future development, researcher expands much work.In US6443583, researcher utilizes the prismatic lens of orthogonal micro-prism structure, and near the exiting surface normal making emergent light focus on light guide plate in the scope of positive and negative 25 degree, this back light system comprises light source, light guide plate, reflector plate, diffusion sheet and prismatic lens.The light that light source sends enters light guide plate inside through the incidence surface of light guide plate, by being arranged on the reflectors reflects of subjacent of light guide plate and the exiting surface through light guide plate exports, bottom surface of light guide plate is provided with the light modulation site of certain coating rate, be used for destroying the total reflection effect of light guide plate inside, realize area source and export.But comprise two panels in this device independent of the prismatic lens outside main body, be unfavorable for integrated, the slimming design of backlight module, manufacturing cost and rigging error also increase thereupon.In TW200745654, researcher utilizes light control film to regard one to cover before barrier is attached at liquid crystal display, to reach the object of restriction outgoing light-source angle.Light control film has the ultra tiny window shutter of compact arranged black, its role is to control light by the direction of propagation of film, makes light only can through the transparent region on film.But on light control film, the ultra tiny shuttering of black can absorb light, and make light penetration decline, the efficiency of light energy utilization declines to a great extent, and causes the problem of brightness of illumination deficiency.To sum up, existing lighting device is all difficult to take into account optical property and the high problem of integrated level, and some lighting demands such as LCD backlight module is also aimed at required by straightforward, polarizability has, in order to address this problem, be necessary to provide that a kind of structure function is complete, technique is easy to realize, area source structure with low cost.
Summary of the invention
The present invention aims to provide a kind of with the collimation-type area lighting source illumination device of polarized light outgoing, for realizing as the lighting requirement in liquid crystal display.This structure can realize the polarized light of higher degree, and emergent light has high collimation, and compact conformation, processing technology is easy to realize, and design relative to other light guide structures, integrated level is higher, structure function is more complete, because emergent light has polarizability and collimation property, be particularly suitable for needing the illumination of polarization collimation plane light source to apply, and be conducive to the slimming design of system architecture.
In order to achieve the above object, the present invention by the following technical solutions: a kind of light guide structure for realizing polarization collimation plane light source, is characterized in that: comprise light guide structure main body, incident polarization light source and microlens array group; Described incident polarization light source is positioned at light guide structure main body side; Microlens array group comprises parabolic reflector collimation microlens, quarter-wave plate, spill light modulation site and reflective polarizer; Spill light modulation site is positioned at the exiting surface place of light guide structure main body; Described reflective polarizer is filled in spill light modulation site, and the polarized light of reflective polarizer is perpendicular through the polarization direction of direction and incident polarization light source; Side relative with spill light modulation site in light guide structure main body is close to inside described quarter-wave plate; Described parabolic reflector lens are arranged on the outside of quarter-wave plate; Parabolic reflector collimation microlens is positioned at immediately below spill light modulation site, and spill light modulation site is positioned in the focus of parabolic reflector collimation microlens, forms unique corresponding relation; Incident ray polarized light is incident by side, light vibration is along single direction, total reflection condition will be met after incident light enters light guide structure main body to propagate in light guide structure main body, when light runs into spill light modulation site and reflective polarizer, the direction of propagation will be changed in light guide structure main body, namely shoot to bottom surface, again via the acting in conjunction of quarter-wave plate and parabolic reflector collimation microlens, make emerging ray polarized light become the collimated light of direction of vibration perpendicular to former linearly polarized light, finally define the collimation plane light source had compared with high-polarization.
In an embodiment of the present invention, incident polarization light source comprises polarizer part and common incident light source, and polarizer part is positioned over the light inlet between common incident light source and light guide structure main body; For light guide structure, incident light source is line source form, or pointolite presses the set of the linear alignment.
In an embodiment of the present invention, incident polarization light source is the LED light source of direct outgoing polarization light, and the set of this LED light source, by line spread, forms the form of side entering type line source.
In an embodiment of the present invention, the mode that quarter-wave plate and parabolic reflector collimation microlens adopt first shaping rear gummed, serigraphy or increase material manufacture is attached in light guide structure main body successively.
In an embodiment of the present invention, the fast axle of described quarter-wave plate and incident polarization light direction are 45 ° of angles, and former polarized light through quarter-wave plate twice, will be converted to the emerging ray polarized light perpendicular to former polarized light direction of vibration.
In an embodiment of the present invention, the ranges of indices of refraction of guide-lighting main body is between 1.4 ~ 1.9, and the refractive index of light guide structure material of main part is greater than the refractive index of quarter-wave plate; The refractive index of quarter-wave plate is greater than the lenticular refractive index of parabolic reflector, and namely the refractive index of parabolic reflective lens and the refractive index of quarter-wave plate match; The lenticular actual focal spot of parabolic reflector is positioned at described spill light modulation site place, and the parabolic type interface that contacts with air of parabolic reflector collimation microlens is coated with one deck reflectance coating, make to be incident to paraboloidal light from light modulation site after reflection abreast by light emission side outgoing, and can't help parabola and directly penetrate guide-lighting main body.
In an embodiment of the present invention, the lenticular shape of described reflection-type is parabolic shape, the bore of each combination is identical, and each parabolic reflector lenticule correspond to unique spill light modulation site, and spill light modulation site is positioned in the lenticular focus of parabolic reflector; The lenticular focal distance f of parabolic reflector, parabola equation are obtained by following formula:
Wherein, point (x, y, z) be any point on parabolic surface, the determination of coordinate system is with the lenticular summit of each parabolic reflector for initial point, and being x direction along light guide plate long side direction, is y direction along light guide plate short side direction, the direction that initial point points to light modulation dot surface is defined as z-axis positive dirction, and the positive dirction of x, y, z three axle is right-hand screw rule; θ
1, θ
2light guide plate dielectric layer incident ray angle, parabolic reflector lenticule dielectric layer emergent ray angle respectively, h
1, h
3the thickness of guide-lighting main body, the lenticular thickness of parabolic reflector respectively; Parabolic reflector lenticular useful effect bore is determined according to following formula:
，
Wherein, θ and light modulation site and the angle between corresponding parabolic reflector collimation microlens edge line and normal.
In an embodiment of the present invention, each light modulation site of spill light modulation site is semisphere, and diameter is identical, along being density arrangement away from the plane of incidence, to control the homogeneity of the Illumination Distribution of exit facet.
In an embodiment of the present invention, described reflective polarizer is for selecting reflection multilayer polarizer, it depends on the difference of at least two kinds of different materials refractive indexes, optionally reflect the light of a polarization direction, and the light different with the polarization direction of this polarized light will transmit light guide structure, make the unitarity of polarized light in light guide structure.
In an embodiment of the present invention, also comprise quantum dot diaphragm, any place of described quantum dot diaphragm arrangement in the exiting surface side of guide-lighting main body, between incident polarization light source and light guide structure main body or between light guide structure main body and reflection-type lenticule; Described quantum dot diaphragm is red green or RGB quantum dot diaphragm, is excited the white light of the colour gamut that is expanded by blue light source or ultraviolet source incidence.
Light guide structure of the present invention can realize the polarized light of higher degree, and emergent light has high collimation, and compact conformation, processing technology is easy to realize, and design relative to other light guide structures, integrated level is higher, structure function is more complete, because emergent light has polarizability and collimation property, be particularly suitable for the application needing polarization collimation plane light source, and be conducive to the slimming design of system architecture.
Accompanying drawing explanation
Fig. 1 is the present invention first initial configuration, and the locus schematic diagram of wherein ordinary light source, polarizing component, light guide structure main body, microlens array group.
Fig. 2 is the present invention second initial configuration, and the locus schematic diagram of wherein polarized light source, light guide structure main body, microlens array group.
Fig. 3 is the outgoing situation of light light after microlens array group collimation in the present invention first initial configuration.
Fig. 4 is that in the present invention second initial configuration, light carries out situation about being totally reflected in guide-lighting main body.
Fig. 5 (a) is by quantum dot diaphragm and quarter-wave plate and parabolic reflector collimation microlens device architecture schematic diagram glued together on the basis of specific embodiment 1.B () is by quantum dot diaphragm and quarter-wave plate and parabolic reflector collimation microlens device architecture schematic diagram glued together on specific embodiment 2 basis.
Fig. 6 (a) is the device architecture schematic diagram adding quantum dot diaphragm on specific embodiment 1 basis at light inlet.B () is the device architecture schematic diagram adding quantum dot diaphragm on specific embodiment 2 basis at light inlet.
Fig. 7 (a) is the device architecture schematic diagram adding quantum dot diaphragm on specific embodiment 1 basis in bright dipping place.B () is the device architecture schematic diagram adding quantum dot diaphragm on specific embodiment 2 basis in bright dipping place.
Fig. 8 is parabolic reflector collimation microlens calculation of diameter schematic diagram in the present invention.
Fig. 9 is that in the present invention, parabolic reflector collimation microlens equivalent focus calculates schematic diagram.
Figure 10 is the schematic three dimensional views of modeling and simulating structure of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention will be further described.
In the accompanying drawings, the structures such as incident light source, polarizing component, light guide structure main body, parabolic reflector collimation microlens, quarter-wave plate, spill light modulation site and reflective polarizer are idealized model, should not be considered to its parameter of strict regulations, physical dimension.At this, Figure of description is the schematic diagram of idealized embodiments of the present invention, and illustrated embodiment should not be considered to the given shape being only limitted to the region shown in figure, but comprises other shapes that can realize identical function.Accessory in the present embodiment, the expression in figure is schematic, but this should not be considered to limit the scope of the invention.
The invention provides a kind of light guide structure for realizing polarization collimation plane light source, it comprises light guide structure main body, penetrates polarized light source and microlens array group, described incident polarization light source is positioned at light guide structure main body side, microlens array group comprises parabolic reflector collimation microlens, quarter-wave plate, spill light modulation site and reflective polarizer, spill light modulation site is positioned at the exiting surface place of light guide structure main body, described reflective polarizer is filled in spill light modulation site, side relative with spill light modulation site in light guide structure main body is close to inside described quarter-wave plate, described parabolic reflector lens are arranged on the outside of quarter-wave plate, parabolic reflector collimation microlens is positioned at immediately below spill light modulation site, and spill light modulation site is positioned in the focus of parabolic reflector collimation microlens, forms unique corresponding relation, incident ray polarized light is incident by side, light vibration is along single direction, total reflection condition will be met after incident light enters light guide structure main body to propagate in light guide structure main body, when light is to each spill light modulation site, the total reflection that spill light modulation site will be destroyed in former travel path, light transmition direction is changed, by the effect of reflective polarizer, light is reflected back toward in light guide structure main body, through the acting in conjunction of quarter-wave plate and parabolic reflector collimation microlens, emerging ray polarized light becomes the collimated light of direction of vibration perpendicular to former linearly polarized light, finally define the collimation plane light source had compared with high-polarization.
In an embodiment of the present invention, incident polarization light source comprises polarizer part and common incident light source, and polarizer part is positioned over the light inlet between common incident light source and light guide structure main body;
In an embodiment of the present invention, incident polarization light source is the LED light source of direct outgoing polarization light.
In an embodiment of the present invention, the mode that quarter-wave plate and parabolic reflector collimation microlens adopt first shaping rear gummed, serigraphy or increase material manufacture is attached in light guide structure main body successively.
In an embodiment of the present invention, the fast axle of described quarter-wave plate and incident polarization light direction are 45 ° of angles, and former polarized light through quarter-wave plate twice, will be converted to the emerging ray polarized light perpendicular to former polarized light direction of vibration.
In an embodiment of the present invention, the ranges of indices of refraction of guide-lighting main body is between 1.4 ~ 1.9, and the refractive index of light guide structure material of main part is greater than the refractive index of quarter-wave plate; The refractive index of quarter-wave plate is greater than the lenticular refractive index of parabolic reflector, and namely the refractive index of parabolic reflective lens and the refractive index of quarter-wave plate match; The lenticular actual focal spot of parabolic reflector is positioned at described spill light modulation site place, and the parabolic type interface that contacts with air of parabolic reflector collimation microlens is coated with one deck reflectance coating, make to be incident to paraboloidal light from light modulation site after reflection abreast by light emission side outgoing, and can't help parabola and directly penetrate guide-lighting main body.
In an embodiment of the present invention, the lenticular shape of described reflection-type is parabolic shape, the bore of each combination is identical, and each parabolic reflector lenticule correspond to unique spill light modulation site, and spill light modulation site is positioned in the lenticular focus of parabolic reflector; The lenticular focal distance f of parabolic reflector, parabola equation are obtained by following formula:
Wherein, point (x, y, z) be any point on parabolic surface, the determination of coordinate system is with the lenticular summit of each parabolic reflector for initial point, and being x direction along light guide plate long side direction, is y direction along light guide plate short side direction, the direction that initial point points to light modulation dot surface is defined as z-axis positive dirction, and the positive dirction of x, y, z three axle is right-hand screw rule; θ
1, θ
2light guide plate dielectric layer incident ray angle, parabolic reflector lenticule dielectric layer emergent ray angle respectively, h
1, h
3the thickness of guide-lighting main body, the lenticular thickness of parabolic reflector respectively; Parabolic reflector lenticular useful effect bore is determined according to following formula:
，
Wherein, θ and light modulation site and the angle between corresponding parabolic reflector collimation microlens edge line and normal.
In an embodiment of the present invention, each light modulation site of spill light modulation site is semisphere, and diameter is identical, along being density arrangement away from the plane of incidence, to control the homogeneity of the Illumination Distribution of exit facet.
In an embodiment of the present invention, described reflective polarizer is for selecting reflection multilayer polarizer, it depends on the difference of at least two kinds of different materials refractive indexes, optionally reflect the light of a polarization direction, and the light different with the polarization direction of this polarized light will transmit light guide structure, ensure the unitarity of polarized light in light guide structure.
In an embodiment of the present invention, also comprise quantum dot diaphragm, any place of described quantum dot diaphragm arrangement in the exiting surface side of guide-lighting main body, between incident polarization light source and light guide structure main body or between light guide structure main body and reflection-type lenticule; Described quantum dot diaphragm is red green or RGB quantum dot diaphragm, is excited the white light of the colour gamut that is expanded by blue light source or ultraviolet source incidence.
In the specific embodiment of the invention 1, Fig. 1 shows this back lighting device for realizing the outgoing of polarization collimation plane light source, which includes ordinary light source 11, polarizer part 2, light guide structure main body 3, microlens array group 4 in spatial order arrangement.In initial configuration in FIG, microlens array group 4 is made up of parabolic reflector collimation microlens 44, quarter-wave plate 43, reflective polarizer 42 and spill light modulation site 41.Wherein, spill light modulation site 41 utilizes the mode of hot pressing or laser ablation by trench etch out, reflective polarizer 42 is filled in spill light modulation site 41, reflective polarizer 42 generally selects sandwich construction, it depends on the difference of at least two kinds of different materials (prioritizing selection polymkeric substance) refractive index, optionally reflect the light of a polarization direction, and the light different with the polarization direction of this polarized light will transmit light guide structure, ensure the unitarity of polarized light in light guide structure.Spill light modulation site 41 is according to light uniformity requirement, and edge is the non-homogeneous arrangement of density away from plane of incidence direction.The mode that quarter-wave plate 43 and parabolic reflector collimation microlens 44 adopt first shaping rear gummed, serigraphy or increase material manufacture is attached in light guide structure main body 3 successively, parabolic reflector collimation microlens 44 is positioned at immediately below spill light modulation site 41, and spill light modulation site 41 is positioned in the focus of parabolic reflector collimation microlens 44, forms unique corresponding relation.The ranges of indices of refraction of guide-lighting main body 3 is between 1.4 ~ 1.9, and for ensureing that light produces total reflection in guide-lighting main body 3, the refractive index of quarter-wave plate 43 should be less than the refractive index of light guide structure main body 3 material.The bore of parabolic reflector collimation microlens 44 is determined according to the angle of total reflection of light guide structure main body 3 with parabolic reflector collimation microlens 44 two kinds of different mediums.The parabolic type interface that lenticule contacts with air need plate one deck reflectance coating 441, makes to be incident to paraboloidal light from light modulation site after reflection abreast by light emission side outgoing, and can not directly penetrate guide-lighting main body by parabola.The light sent when ordinary light source 11 by polarizer part 2 after obtain linearly polarized light, linearly polarized light enters in light guide structure main body 3 from the side, and the line source of incident sideways changes the direction of propagation, changes the uniform area light source of front outgoing into.By the design of upper surface spill light modulation site 41, destroy original total reflection, light is reflected on spill light modulation site 41.Fill reflective polarizing devices 42 in spill light modulation site 41, reflective polarizer can reflect the polarized light of a direction, and the light vertical with the polarization direction of this polarized light will transmit light guide structure.Because light obtains the consistent linearly polarized light in polarization direction after the polarizer 2, the light of this polarization direction will be reflected by reflective polarizer 42, linearly polarized light polished object face reflection-type collimation microlens 44 reflectance coating that lower surface plates 441 after quarter-wave plate 43 reflects, because parabolic reflector lenticule 44 is different from the refractive index of guide-lighting main body 3, then the focal distance f of parabolic reflector lenticule 44 can by the thickness h of parabolic reflector lenticule 44
3with the equivalent thickness h of main body guide-lighting after converting
2addition obtains.Following formula is determined:
Wherein, n
1, n
2, θ
1, θ
2the refractive index of guide-lighting main body 3 material, the refractive index of parabolic reflector lenticule 44, light guide structure main body 3 dielectric layer incident ray angle, parabolic reflector lenticule 44 dielectric layer emergent ray angle respectively.Formula 1 can be obtained by refraction law, as shown in Figure 9, solve the length of focal distance f according to geometric relationship.Set up rectangular coordinate system, with the summit of each parabolic reflector lenticule 44 for initial point, be x direction along guide-lighting main body 3 long side direction, be y direction along guide-lighting main body 3 short side direction, the direction that initial point points to 41, spill light modulation site is defined as z-axis positive dirction, and the positive dirction of x, y, z three axle is right-hand screw rule.According to the focal distance f of reflection-type lenticule 44 parabolic equation that can to obtain with reflection-type lenticule 44 summit be true origin:
As shown in Figure 8, the useful effect bore of parabolic reflector lenticule 44 is according to the thickness h of light guide structure main body 3
1and the angle of total reflection is determined, spill light modulation site 41 is set and the angle theta between corresponding parabolic reflector lenticule 44 edge line and normal is more than or equal to the angle of total reflection, make the light of scattering between site 41 crosstalk can not occur, the then useful effect bore of parabolic reflector lenticule 44, namely the lowest calibre of lens 44 can be determined by following formula:
Because spill light modulation site 41 is positioned on the equivalent focus of parabolic reflector collimation microlens 44, and bore is determined by r formula, then emergent ray is collimated light, because the fast axle of quarter-wave plate 43 and incident polarization light direction are 45 ° of angles, former polarized light is through quarter-wave plate twice, be converted to the linearly polarized light outgoing perpendicular to former polarized light direction of vibration, then light secondary is by obtaining polarization direction and playing folk prescription to vertical linearly polarized light after quarter-wave plate 43, the light of this polarization direction can Transflective polarizer 42 and can directly from the outgoing of light guide structure body upper surface, thus realize the outgoing of even polarization collimation plane light source.In the initial configuration 1 of embodiment 1, the outgoing situation of light light after microlens array group collimation is see Fig. 3, and the situation that in initial configuration 1, light carries out being totally reflected in guide-lighting main body is see Fig. 4.
In the specific embodiment of the invention 2, Fig. 2 shows this back lighting device for realizing the outgoing of collimation plane light source, which includes polarized light source 12, light guide structure main body 3, microlens array group 4 in spatial order arrangement.Modify to incident light source in initial configuration in fig. 2, microlens array group 4 is made up of parabolic reflector collimation microlens 44, quarter-wave plate 43, reflective polarizer 42 and spill light modulation site 41.Wherein, reflective polarizer 42 is filled in spill light modulation site 41, and spill light modulation site 41 is according to light uniformity requirement, and edge is arrange by dredging close mode away from plane of incidence direction.Side relative with spill light modulation site in light guide structure main body 3 is close to inside quarter-wave plate 43; Described parabolic reflector lens 44 are arranged on the outside of quarter-wave plate 43; Parabolic reflector collimation microlens 44 is positioned at immediately below semisphere spill light modulation site 41, and semisphere spill light modulation site 41 is positioned in the focus of parabolic reflector collimation microlens 44.About the focus calculation of parabolic reflector collimation microlens 44 and the determination reference specific embodiment 1 of bore thereof, do not add herein and repeat.The parabolic type interface that lenticule contacts with air need plate one deck reflectance coating 441, makes to be incident to paraboloidal light from light modulation site after reflection abreast by light emission side outgoing, and can not directly penetrate guide-lighting main body by parabola.The light sent when polarized white light light source 12 enters in light guide structure main body 3 from the side, and the line source of incident sideways changes the direction of propagation, changes the uniform area light source of front outgoing into.By the design of upper surface semisphere spill light modulation site 41, destroy original total reflection condition, make light within the scope of the effective aperture being incident to parabolic reflector collimation microlens, light is after reflecting film reflects, be parallel to z-axis outgoing, thus realize the outgoing of even collimation plane light source.
In the specific embodiment of the invention 3, Fig. 5 to Fig. 7 shows this back lighting device for realizing the outgoing of polarization collimation plane light source, which includes spatial order arrangement normal blue radiant 11(or polarized blue light light source 12), polarizer part 2, light guide structure main body 3, microlens array group 4.The basis of embodiment 1 is added quantum dot diaphragm, and placement location and the geometric relationship of all the other elements remain unchanged, and about the focus calculation of parabolic reflector collimation microlens 44 and the determination reference specific embodiment 1 of bore thereof, do not add herein and repeat.Quantum dot diaphragm can be positioned over the diverse location of guide-lighting main body, add quantum dot diaphragm in the exiting surface side of guide-lighting main body, before polarizer part or after polarizer part, add quantum dot diaphragm, between guide-lighting main body and reflection-type lenticule, add quantum dot diaphragm, its object is all identical, such that emergent ray half wave peak width is narrow, excitation is high, luminescence efficiency is high, rich color.The route of transmission of light in guide-lighting main body is consistent with the light transmition route in embodiment 1, does not add herein and repeats.Redgreenblue by a certain percentage mixed light reaches white balance, obtains white light outgoing, expands the object of color gamut wideness.Excited by blue light source incidence and obtain ruddiness and green glow (or excited by ultraviolet source incidence obtain redgreenblue light), its objective is that mixed light reaches uniform white balance or expands colour gamut.
Figure 10 is the schematic three dimensional views of the modeling and simulating structure of the embodiment of the present invention 1, can find out that multiple functional module height is integrated in a light guide module by the present invention, improve the light guide structure of conventional multilayer assembly superposition, adopt technical scheme of the present invention can realize the polarized light of higher degree, and emergent light has high collimation, and compact conformation, processing technology is easy to realize, relative to conventional light guide structural design, integrated level is higher, structure function is more complete, because emergent light has polarizability and collimation property, be particularly suitable for the application needing polarization collimation plane light source, and be conducive to the slimming design of system architecture.
Above-listed preferred embodiment; the object, technical solutions and advantages of the present invention are further described; be understood that; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. for realizing a light guide structure for polarization collimation plane light source, it is characterized in that: comprise light guide structure main body, incident polarization light source and microlens array group; Described incident polarization light source is positioned at light guide structure main body side;
Microlens array group comprises parabolic reflector collimation microlens, quarter-wave plate, spill light modulation site and reflective polarizer;
Spill light modulation site is positioned at the exiting surface place of light guide structure main body; Described reflective polarizer is filled in spill light modulation site, and the polarized light of reflective polarizer is perpendicular through the polarization direction of direction and incident polarization light source; Side relative with spill light modulation site in light guide structure main body is close to inside described quarter-wave plate; Described parabolic reflector lens are arranged on the outside of quarter-wave plate; Parabolic reflector collimation microlens is positioned at immediately below spill light modulation site, and spill light modulation site is positioned in the focus of parabolic reflector collimation microlens, forms unique corresponding relation;
Incident ray polarized light is incident by side, light vibration is along single direction, total reflection condition will be met after incident light enters light guide structure main body to propagate in light guide structure main body, when light runs into spill light modulation site and reflective polarizer, the direction of propagation will be changed in light guide structure main body, namely shoot to bottom surface, again via the acting in conjunction of quarter-wave plate and parabolic reflector collimation microlens, make emerging ray polarized light become the collimated light of direction of vibration perpendicular to former linearly polarized light, finally define the collimation plane light source had compared with high-polarization.
2. the light guide structure for realizing polarization collimation plane light source according to claim 1, is characterized in that: incident polarization light source comprises polarizer part and common incident light source, and polarizer part is positioned over the light inlet between common incident light source and light guide structure main body; For light guide structure, incident light source is the set by the linear alignment of line source form or pointolite.
3. the light guide structure for realizing polarization collimation plane light source according to claim 1, is characterized in that: incident polarization light source is the LED light source of direct outgoing polarization light, and the set of this LED light source, by line spread, forms the form of side entering type line source.
4. the light guide structure for realizing polarization collimation plane light source according to claim 1, is characterized in that: the mode that quarter-wave plate and parabolic reflector collimation microlens adopt first shaping rear gummed, serigraphy or increase material manufacture is attached in light guide structure main body successively.
5. the light guide structure for realizing polarization collimation plane light source according to claim 1, it is characterized in that: the fast axle of described quarter-wave plate and incident polarization light direction are 45 ° of angles, former polarized light through quarter-wave plate twice, will be converted to the emerging ray polarized light perpendicular to former polarized light direction of vibration.
6. the light guide structure for realizing polarization collimation plane light source according to claim 1, is characterized in that: the ranges of indices of refraction of guide-lighting main body is between 1.4 ~ 1.9, and the refractive index of light guide structure material of main part is greater than the refractive index of quarter-wave plate; The refractive index of quarter-wave plate is greater than the lenticular refractive index of parabolic reflector, and namely the refractive index of parabolic reflective lens and the refractive index of quarter-wave plate match; The lenticular actual focal spot of parabolic reflector is positioned at described spill light modulation site place, and the parabolic type interface that contacts with air of parabolic reflector collimation microlens is coated with one deck reflectance coating, make to be incident to paraboloidal light from light modulation site after reflection abreast by light emission side outgoing, and can't help parabola and directly penetrate guide-lighting main body.
7. the light guide structure for realizing polarization collimation plane light source according to claim 1, it is characterized in that: the lenticular shape of described reflection-type is parabolic shape, the bore of each combination is identical, each parabolic reflector lenticule correspond to unique spill light modulation site, and spill light modulation site is positioned in the lenticular focus of parabolic reflector;
The lenticular focal distance f of parabolic reflector, parabola equation are obtained by following formula:
Wherein, point (x, y, z) be any point on parabolic surface, the determination of coordinate system is with the lenticular summit of each parabolic reflector for initial point, and being x direction along light guide plate long side direction, is y direction along light guide plate short side direction, the direction that initial point points to light modulation dot surface is defined as z-axis positive dirction, and the positive dirction of x, y, z three axle is right-hand screw rule; θ
1, θ
2light guide plate dielectric layer incident ray angle, parabolic reflector lenticule dielectric layer emergent ray angle respectively, h
1, h
3the thickness of guide-lighting main body, the lenticular thickness of parabolic reflector respectively;
Parabolic reflector lenticular useful effect bore is determined according to following formula:
Wherein, θ and light modulation site and the angle between corresponding parabolic reflector collimation microlens edge line and normal.
8. the light guide structure for realizing polarization collimation plane light source according to claim 1, it is characterized in that: each light modulation site of spill light modulation site is semisphere, and diameter is identical, along being density arrangement away from the plane of incidence, to control the homogeneity of the Illumination Distribution of exit facet.
9. the light guide structure for realizing polarization collimation plane light source according to claim 1, it is characterized in that: described reflective polarizer is for selecting reflection multilayer polarizer, it depends on the difference of at least two kinds of different materials refractive indexes, optionally reflect the light of a polarization direction, and the light different with the polarization direction of this polarized light will transmit light guide structure, make the unitarity of polarized light in light guide structure.
10. the light guide structure for realizing polarization collimation plane light source according to claim 1, it is characterized in that: also comprise quantum dot diaphragm, for promoting the colour gamut of lighting device, any place of described quantum dot diaphragm arrangement in the exiting surface side of guide-lighting main body, between incident polarization light source and light guide structure main body or between light guide structure main body and reflection-type lenticule; Described quantum dot diaphragm is red green or RGB quantum dot diaphragm, is excited obtain white light by blue light source or ultraviolet source incidence.
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