CN101634753A - Combined type light-splitting element and imaging device - Google Patents
Combined type light-splitting element and imaging device Download PDFInfo
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- CN101634753A CN101634753A CN200810133731A CN200810133731A CN101634753A CN 101634753 A CN101634753 A CN 101634753A CN 200810133731 A CN200810133731 A CN 200810133731A CN 200810133731 A CN200810133731 A CN 200810133731A CN 101634753 A CN101634753 A CN 101634753A
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Abstract
The invention relates to a combined type light-splitting element for receiving a light beam mixed with the light of at least two wave bands. The combined type light-splitting element comprises a refraction-diffraction element and a refraction element, wherein the refraction-diffraction element can receive the light beam to achieve the function of light beam convergence and separate the light beam into the light of the wave bands in a deviation direction; and the refraction element can deviate the separated light of the wave bands so that the light of the wave bands is emitted from a direction. The combined type light-splitting element can be applied to an imaging device, and the separated light of the wave bands serves as the primitive color light of pixel colors.
Description
Technical field
The technology that the invention relates to a kind of combined type light-splitting element with and the device for image, the particularly combined type light-splitting element that a plurality of band of light can be separated used.
Background technology
The main function one of beam splitter for example is can be with white light beam split (splitting) Cheng Hong (R), green (G), blue (B) three coloured light, or the multiple coloured light of other colors.The mechanism of beam splitter and structure can be complied with the device that uses, and different designs is arranged.In the conventional art, the light of red, green, blue can (color filter CF) reaches via the colored filter of different colours.
In flat-panel screens, backlight is often arranged in pairs or groups liquid crystal spatial modulator (spatial light modulator) and colored filter to present full-colorization image.And the image sensor in digital camera, the calculation that also needs colored filter accompanying colour difference is to present the color of the original.In relatively large system, then adopt three-plate type or double-plate prism group or colored filter as colour camera and back projection TV, the collocation collimated light source is to present the full color image.When system adopts colored filter, because of each colored pixels of colored filter can only present the wherein single primary colors of red green blue tricolor, there is 2/3rds incident white light energy to be absorbed approximately, reduced the optics service efficiency, also reduce battery serviceable life.The technology of colored filter itself is very loaded down with trivial details in addition, and each primary colors need use above together semiconductor gold-tinted technology at least, and cost is high.
With regard to known patent, No. 6867828, the patent of invention of the U.S. " Light guide apparatus; a backlight apparatus and a liquid crystal display apparatus " for example, and No. 7164454, patent of invention " Color filterless display device; optical element; and manufacture ", it mainly is to utilize the microprism array of special angle or become the structure micro grid array to make recombination dichroic elements, in order to white light is carried out beam split, after the white light beam split, can in the space, carry out one section far-field diffraction, and white light source be resolved into red, green, primary colors light; But complicated, the complex structure of the technology of its beam splitter, yields and cost are difficult for grasping; Similarly, the shooting angle direction of the Red Green Blue light that is decomposed can exhale along with diffraction angle, can continue to disperse after entering panel, causes veiling glare and ghost, and is unsatisfactory on actual panel is used; In addition, the technological means that above-mentioned known patent proposed can't improve aperture opening ratio (aperture ratio) and polarization efficiency.
Therefore, the dealer still continues to research and develop optical elements sets, for example wishes to replace colored filter, under the situation of keeping the height optical efficiency, can produce the three primary colors corresponding to panel pixel and vertical incidence liquid crystal layer.
Summary of the invention
The invention provides a kind of combined type light-splitting element, can need not colored filter, the wavelength difference of incident beam according to coloured light can be isolated kind of a primitive color light, for example can be for the use of device for image.
The present invention proposes a kind of combined type light-splitting element, receives the light beam that mixes at least two band of light.This combined type light-splitting element comprises a folding diffraction element and a refracting element; Wherein, on one first surface of this folding diffraction element, comprising a plurality of lenticules, is the light beam that contracts in order to this light beam that dwindles reception, reaches the function of converging beam, and on the second surface with respect to this first surface, be that one-period property optical grating construction is arranged,, make the light generation diffraction effect separately of different wave length via the grating mechanism of action, thereby separate the light of different-waveband, the light beam that also this can be contracted separates those band of light on a deviation direction.More for example this refracting element can comprise a refraction structure in addition, and those band of light of having separated with deviation are from a direction outgoing.
This refraction structure of refracting element is the refraction structure of one dimension or two dimension, and this refraction structure can for example be optical grating construction, prism structure or polygonized structure.
In one embodiment of this invention, this refraction structure of this refracting element is an optical grating construction, and wherein, this optical grating construction can for example be glitter formula grating, multistage type grating or sub-wavelength grating, and its cycle is for example between 0.1～10 λ.
In another embodiment of the present invention, this refraction structure of this refracting element is a prism structure, and the cycle is between 5～2000 λ.
In another embodiment of the present invention, this refraction structure of this refracting element more can be respectively in each zones of corresponding those band of light level refraction structure once.
In one embodiment of this invention, this light beam comprises three band of light of red, green, blue, and in addition, this light beam can be polarized light or nonpolarized light.
In an embodiment of the present invention, in this combined type light-splitting element, this folding diffraction element is the polarisation material.
In an embodiment of the present invention, in this combined type light-splitting element, this refracting element is the polarisation material.
In an embodiment of the present invention, this combined type light-splitting element also comprises a polarizing layer, and this polarizing layer is positioned at the front end of this folding diffraction element, makes this light beam be introduced into this polarizing layer, carries out after the polarization, enters this folding diffraction element again.
In further embodiment of this invention, this combined type light-splitting element also comprises a polarizing layer, this polarizing layer is between this folding diffraction element and this refracting element, make those band of light of having separated be introduced into this polarizing layer, carry out entering this refracting element again after the polarization.
In an embodiment of the present invention, cycle, the planform the two or one of them of this refraction structure of the periodicity optical grating construction of this folding diffraction element and this refracting element are identical or different.
In an embodiment of the present invention, those lenticules of this folding diffraction element are respectively the identical little diffraction lens of shape, this slightly the diffraction lens can be little diffraction lens of focus type.
In an embodiment of the present invention, this periodicity optical grating construction of this folding diffraction element is polygon or wedge structure.
In an embodiment of the present invention, this periodicity optical grating construction of this folding diffraction element is one dimension or two-dimensional structure, and the cycle is 0.1～10 λ.In addition, this periodicity optical grating construction of this folding diffraction element can be glitter formula grating, multistage type grating or sub-wavelength grating.
In an embodiment of the present invention, the distance of this second surface of this folding diffraction element and this refracting element is 0.1mm～30mm.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Figure 1 shows that according to one embodiment of the invention the plane formula image display uses the structural profile synoptic diagram of combined type light-splitting element of the present invention.
Figure 2 shows that the spectrum diagram of cold-cathode fluorescence lamp.
Figure 3 shows that according to one embodiment of the invention optical grating construction and schematic diagram of mechanism.
Fig. 4 a-4b is depicted as according to one embodiment of the invention, the diagrammatic cross-section of combined type light-splitting element.
Fig. 5 a-5b is depicted as according to one embodiment of the invention, the diagrammatic cross-section of combined type light-splitting element.
Figure 6 shows that according to one embodiment of the invention to have the combined type light-splitting element diagrammatic cross-section of optimizing effect.
Figure 7 shows that according to one embodiment of the invention to have the combined type light-splitting element diagrammatic cross-section of optimizing effect.
The main element symbol description
100: backlight module
102: folding diffraction element
102a: lenticule
102b: periodicity optical grating construction
103: band of light
104: refracting element
104a: refraction structure
104b: refraction structure
104c: refraction structure
104d: refraction structure
105: band of light
106: display panel
108: color light
300: second surface
302: the periodicity optical grating construction
304: incident light
306: ruddiness
308: green glow
310: blue light
604,606,608: secondary optical grating construction
704,706,708: secondary refraction structure
Embodiment
The present invention proposes a kind of combined type light-splitting element, can receive the light beam of at least two band of light of mixing.This combined type light-splitting element comprises a folding diffraction element and a refracting element, wherein on a first surface of this folding diffraction element, comprise a plurality of lenticules, in order to this light beam that dwindles reception is the light beam that contracts, reach the function of converging beam, and on a second surface, one-period property optical grating construction is arranged, the light beam that contracts can be separated those band of light on a deviation direction with respect to this first surface.This periodicity optical grating construction of this folding diffraction element for example is a polygonized structure, can be made up of a plurality of polygonal lenticule, yet according to actual needs, it needn't be defined as polygonized structure, as long as it is also passable to reach other designs of identical function.This periodicity optical grating construction can be formed wavelength according to difference with this light beam that contracts of incident and carry out open score, and the light beam that different wave length is formed spatially separates by wavelength.In addition, this refracting element comprises a refraction structure, but those band of light that deviation has separated from a direction outgoing, wherein this refraction structure can for example be optical grating construction, prism structure or polygonized structure.Combined type light-splitting element of the present invention for example can be applied in device for image, and those wherein separated band of light are as the primitive color light of pixel color.
This refracting element that combined type light-splitting element of the present invention is included, its refraction structure shape satisfy this through design and pinch ear law or diffraction theory, and feasible those band of light of being composed by branch by this light beam can approaching be parallel to the incident direction outgoing of this light beam.This refraction structure of refracting element for example is a polygonized structure, can be made up of a plurality of polygonal lenticule, yet according to actual needs, it needn't be defined as polygonized structure, as long as it is also passable to reach other designs of identical function.
The combined type light-splitting element of the present invention polarisation material of also can arranging in pairs or groups is done different application, for example as the colored filter in display panel, image sensor and the colour camera or be applied to illuminator, the color branch or the energy size of regulation and control light are to increase the complexity of optics service efficiency or simplification original system.
Below the present invention is described, but the present invention not only is subject to illustrated embodiment for some embodiment.Again, also can mutually combine between the cited embodiment, be not limited only to other embodiment.
Light beam with incident for example is that white light is an example, and present embodiment can be divided into the white light of incident multiple primitive color light (viewing system and light source and decide).With general primaries is example, and it for example is R, G, B, but other coloured light also can be arranged, and it is decided according to needed band of light.Wherein a kind of design is to make each coloured light can be parallel to the incident direction outgoing of light beam, and for example also can be designed to each coloured light can press from both sides an angle outgoing with the incident direction of light beam certainly, and angular range for example is 0 ° to 60 °.When being applied to systems such as panel or colour camera or the like, each coloured light can be corresponding to each location of pixels.
Figure 1 shows that according to one embodiment of the invention combined type light-splitting element of the present invention is applied to the structural profile synoptic diagram of plane formula image display.Consulting Fig. 1, is example with the plane formula image display, and a backlight module 100 produces planar light source.The planar light source that is produced by backlight module 100 for example is a white light, and it is produced by the RGB light emitting diode, or sends the light beam that comprises three primary color wavelength bands via cold-cathode fluorescence lamp (CCFL).Figure 2 shows that the spectrum diagram of cold-cathode fluorescence lamp, wherein, wavelength coverage comprises main primitive color light, promptly is R (611nm), G (544nm), and three kinds of primitive color lights of B (436nm).Yet RGB only is three kinds of primitive color lights of general normal use, and in fact, other kinds primitive color light also can be suitable for, and is not limited to the color mechanism of RGB.
Please continue to consult Fig. 1, this display panel 106 for example is a display panels, but display panel 106 also can be the image panel of capture.In other words, the image unit that can form by pixel of display panel 106.For cooperating the pixel of display panel 106, planar light source is rolled over the diameter that diffraction element 102 aperture according to need dwindles light beam via one, forms at least one light beam that contracts, and isolates the band of light of one group of RGB pixel of corresponding each light beam that contracts.
Comprise a plurality of lenticule 102a on one first surface of folding diffraction element 102, each lenticule 102a wherein, a light beam 101 of the planar light source of receiving unit scope, and it is converged is the light beam that contracts.After light beam 101 carries out converging of light beam 101 via the lenticule 102a on folding diffraction element 102 first surfaces, the light beam that contracts that forms is again by the periodicity optical grating construction 102b on folding diffraction element 102 second surfaces, through the grating mechanism of action, make the light of the corresponding different-waveband of light beam that contracts be separated into three kinds of different band of light 103 of RGB according to wavelength.These band of light 103 make three kinds of different band of light 103 of RGB again via the deviation on refracting element 104 travel directions, to penetrate near mode parallel to each other.In addition, via the deviation of refracting element 104, also make the ejaculation direction of band of light 103 near being parallel to the incident direction of this light beam 101.Can enter the liquid crystal layer of display panel 106 again via the band of light 105 that penetrates behind refracting element 104 deviations, control the power of each band of light 105, can form various color light 108 at each location of pixels at last by liquid crystal wherein.
Figure 3 shows that according to one embodiment of the invention optical grating construction and schematic diagram of mechanism.Consulting Fig. 3, for example is with periodic wedge shape triangular structure at the one-period property optical grating construction 302 of rolling over diffraction element 102 second surfaces 300.Incident light 304 comprises three primitive color lights of RGB.Periodically the cycle of optical grating construction 302 is p, and structure height is d, therefore determines the angle of wedge shape.In addition, the wavelength of RGB is respectively with λ r,, λ g and λ b represent.According to grating formula, when this primaries was got m diffraction rank, the diffraction angle was respectively:
(1)
Wherein θ r, θ g, θ b have a relation with the angle of wedge shape and the refraction coefficient of material, and it can adjust according to actual demand.Yet with regard to the diffraction phenomenon, the light intensity summit on each rank can press from both sides a special angle with incident light, but also can more isolate the difference of thin portion because of difference of wavelength, for example produces ruddiness 306, green glow 308 and blue light 310.
The refraction structure of refracting element 104 can be via the refraction law of grating mechanism of action or geometrical optics with light deflection.With the grating mechanism of action is example, shown in Fig. 4 a and Fig. 4 b.One incident light via a plurality of lenticule 102a on folding diffraction element 102 first surfaces carry out converge after, the light beam that contracts that forms is again by the periodicity optical grating construction 102b on the second surface of folding diffraction element 102, through the grating mechanism of action, make the light of the corresponding different-waveband of light beam that contracts be separated into three kinds of different band of light 103 of RGB according to wavelength.When band of light of all kinds 103 enters refraction structure 104a on the refracting element, for example refraction structure 104a is a polygon grating structure, and it is identical with the polygon grating structural cycle of the periodicity optical grating construction 102b that rolls over diffraction element 102 second surfaces, structural plane is on the contrary, wherein refraction structure 104a can be positioned at the incident end that band of light 103 enters this refracting element 104, shown in Fig. 4 a.Or refraction structure 104a is positioned at the exit end of this refracting element 104 of band of light 103 outgoing, shown in Fig. 4 b.According to reversibility of optical path, under ideal conditions, can be parallel to the incident direction of original initial incident light behind band of light 103 deviations, that is to say, between the triband light 103 for parallel to each other and be spaced a distance, and the pixel of the pairing display panel 106 of vertical incidence respectively.Yet on actual design, it allows some tolerable errors.If when being applied to the colored CCD of digital camera or colour camera, principle is the light source object that comes from the outside with, its difference still, and all the other frameworks are similar.As for the refraction structure 104a of refracting element 104 and depending on of the periodicity optical grating construction 102b two structure relative spacings of rolling over diffraction element 102, be to adjust according to the resolution (that is spacing of RGB the pixel of LCD) that will separate.Certainly, refraction structure 104a also can be that the cycle is identical with periodicity optical grating construction 102b, and the different design of planform.Planform for example is a polygon grating structure, and it more for example is the triangular structure of regular wedge shape (wedge).In addition, considering packing problem, can be that air also can be a transparent material layer between refraction structure 104a and the periodicity optical grating construction 102b, in other words, can be an air or a transparent material layer between this folding diffraction element and this refracting element.
The refraction structure of refracting element 104 also can be via the refraction action mechanism of geometrical optics with light deflection, shown in Fig. 5 a and Fig. 5 b.One incident light via a plurality of lenticule 102a on folding diffraction element 102 first surfaces carry out converge after, the light beam that contracts that forms is again by the periodicity optical grating construction 102b on folding diffraction element 102 second surfaces, through the grating mechanism of action, make the light of the corresponding different-waveband of light beam that contracts be separated into three kinds of different band of light 103 of RGB according to wavelength.When band of light of all kinds 103 enters refraction structure 104b on the refracting element, when for example refraction structure 104b was polygonized structure, can remove to design the slope of refraction structure 104b this moment according to the angle of the refractive index of refracting element material and required deviation.Wherein, refraction structure 104b can be positioned at the incident end that band of light 103 enters this refracting element 104, shown in Fig. 5 a; Or refraction structure 104b is positioned at the exit end of this refracting element 104 of band of light 103 outgoing, shown in Fig. 5 b.The incident direction that can be parallel at last, original initial incident light behind band of light 103 deviations.That is between the triband light 103 for parallel to each other but be spaced a distance, and the pixel of the pairing display panel 106 of vertical incidence respectively.If when being applied to the colored CCD of digital camera or colour camera, principle is the light source object that comes from the outside with, its difference still, and all the other frameworks are similar.As for the refraction structure 104b of refracting element 104 and depending on of the periodicity optical grating construction 102b two structure relative spacings of rolling over diffraction element 102, be to adjust according to the resolution (that is spacing of RGB the pixel of LCD) of separating.
For the consideration of size, for example at display panel 106 places, each band of light 103 need be slightly less than the inferior pixel of display panel 106.For example the display panel that is adopted is if its pixel size is 219X219 μ m
2, the beam size that contracts after then a plurality of lenticule 102a of the first surface through rolling over diffraction element 102 converge, correspondence needs less than 219X49.5 μ m at display panel 106 places after the beam split
2, certainly, the size of size can be done design according to different demands.Folding diffraction element 102 is a light transmissive material, and the determinative of each the lenticule 102a curvature on the first surface is as follows: one, the light refraction coefficient of folding diffraction element 102, refracting element 104, display panel 106 and those interelement materials.Two, folding diffraction element 102, refracting element 104, display panel 106 and those interelement spacing thickness.Three, size and the spacing between display panel 106 its RGB time pixel.
Figure 6 shows that according to one embodiment of the invention to have the combined type light-splitting element diagrammatic cross-section of optimizing effect.Wherein, when the refraction structure on this refracting element 104 was optical grating construction, this refraction structure also had the secondary optical grating construction of an optimization effect respectively in each zone of corresponding those band of light.Consult Fig. 6, the refraction structure 104c on the birefringence element 104 carries out the optimization of structure, with a certain polarization direction of further raising or to the open score light extraction efficiency of incident light.For example, at refraction structure 104c place, at the zone that belongs to ruddiness (R), green glow (G), blue light (G) secondary optical grating construction 604,606,608 is arranged respectively, can be according to incident angle, the thin portion of doing the different cycles changes, so can promote the efficient of beam split, and the thin portion of rising angle adjusts.That is to say that the periodicity optical grating construction 102b on folding diffraction element 102 second surfaces keeps the usefulness of beam split, and the refraction structure 104c on the refracting element 104 can there be the secondary refraction structure of optimizing again.
It is machine-processed as follows that efficient improves: meeting is by open score pass through the periodicity optical grating construction 102b on the second surface of rolling over diffraction element 102 because of incident light after, and the open score x-ray diffraction angle difference of each wavelength, so it is also different that each band of light enters the zone of the refraction structure 104c on the refracting element 104, the structure optimization can further be done at the optical wavelength of passing in each zone, according to following example, the efficient of emergent light is estimated for example can improve 5%.
Three-wavelength with incident light is respectively 436nm, 544nm, 611nm is an example, be incident in combined type light-splitting element of the present invention, wherein roll over periodicity optical grating construction on the diffraction element second surface and the refraction structure on the refracting element and for example be the formula grating that glitters, the cycle P=4 micron of the two structure, depth d=1.11 micron, then triband light is respectively 71% (6.257 °), 84.64% (7.816 °), 80.60% (8.786 °) in the diffraction efficient and the diffraction angle of-1 rank direction, and av eff is 79%.If RGB pixel average headway of display panel is 73 microns, the periodicity optical grating construction of then rolling on the diffraction element second surface is required to be between 2.645～4.222mm to the refraction structure spacing on the refracting element.If structure optimization is further done at the zone that each band of light is passed by each open score district of refraction structure on refracting element, be improved as 86.95%, 84.64%, 83% respectively in the diffraction efficient of-1 rank direction.Av eff is 85%.Total efficiency for example can improve about 5%.
Figure 7 shows that according to one embodiment of the invention to have the combined type light-splitting element diagrammatic cross-section of optimizing effect.In one embodiment of this invention, when the refraction structure 104d on this refracting element 104 was the polygon refraction structure, these how much refraction structures are the level refraction structure once in each zones of corresponding those band of light respectively also.Consult Fig. 7,104d carries out the optimization of structure in this birefringence structure, with a certain polarization direction of further raising or to the open score light extraction efficiency of incident light.For example, at refraction structure 104d, how much secondary refraction structure 704,706,708 is arranged at the zone that belongs to ruddiness (R), green glow (G), blue light (G) respectively, can be according to incident angle, the thin portion of doing different slopes changes, so can promote the efficient of refractive power, and the thin portion of rising angle adjusts.That is to say that the periodicity optical grating construction 102b on the second surface of folding diffraction element 102 keeps the usefulness of beam split, and the refraction structure 104d on the refracting element 104 can there be the secondary refraction structure of optimizing again.
With regard to the technology of making, the realization of each the element microstructure among the present invention for example can utilize Ultraprecision Machining to be machined on the metal pattern with shaping monocrystalline diamond cutter, utilizes injection molding, produces the finished product of micro optical element.
In sum, combined type light-splitting element of the present invention comprises a folding diffraction element and a refracting element; On a first surface of this folding diffraction element, comprise a plurality of lenticules, be the light beam that contracts in order to this light beam that dwindles reception, reach the function of converging beam.On a second surface with respect to this first surface, one-period property optical grating construction is arranged, the light beam that contracts can be separated those band of light on a deviation direction.In addition, this refracting element comprises a refraction structure, but those band of light that deviation has separated are from a direction outgoing.That is last those band of light that penetrate are respectively in the diverse location outgoing, and exit direction is in fact still parallel with the incident direction of this light beam or utilize the design of different refraction structures, make band of light exit direction and this light beam incident direction press from both sides a special angle, angular range for example is 0 ° to 60 °.
This combined type light-splitting element for example can be applied to optical-mechanical systems such as panel, colour camera, digital camera in above-mentioned.
Again for example, it is positive convex lens that each lenticule of this folding diffraction element can be curvature, and its periodic structure can be the prismatic mirror of one dimension or the convex lens of two dimension.The lenticule cycle is between 5～2000 λ.
Again for example, the periodicity optical grating construction of this folding diffraction element is polygon or wedge structure, and its periodic optical grating construction can be the formula grating that glitters, multistage type grating or the sub-wavelength grating of one dimension or two dimension.The cycle of this periodicity optical grating construction is between 0.1～10 λ.
Again for example, the periodicity optical grating construction of this folding diffraction element and the refraction structure on the refracting element are optical grating construction, the gap variableization of the two, spacing thickness range 0.1mm～30mm for example, with the beam split angle that cooperates those optical grating constructions to be caused, make different band of light when outgoing, keep specific interval.
Again for example, enter the light beam of combined type light-splitting element, can be polarized light or nonpolarized light.
Again for example, the refraction structure on this refracting element is the optical grating construction of polygon or wedge shape, and its structure can be the formula grating that glitters, multistage type grating or the sub-wavelength grating of periodic one dimension or two dimension.The grating cycle is between 0.1～10 λ.
Again for example, the refraction structure on this refracting element is the polygon refraction structure, and its structure can be the prism of periodic one dimension or two dimension.The prism size is between 5～2000 λ.
Again for example, this folding diffraction element and refracting element one of them or the two can be polarization material.Again for example, the periodicity optical grating construction on this folding diffraction element and the interval insulant of refracting element can be polarization material.Again for example, before this folding diffraction element, one polarization material layer can be set.
Though the present invention with preferred embodiment openly as above; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (20)
1. a combined type light-splitting element receives a light beam that mixes a plurality of band of light, and this combined type light-splitting element comprises:
One folding diffraction element, have a first surface with respect to a second surface of this first surface, comprise a plurality of lenticules on this first surface, become the light beam that contracts in order to this light beam that dwindles reception, and comprise one-period property optical grating construction on this second surface, the light beam that this can be contracted separates those band of light on a deviation direction; And
One refracting element comprises a refraction structure, but those band of light that deviation has separated are from a direction outgoing.
2. combined type light-splitting element according to claim 1, wherein this light beam comprises three band of light of red, green, blue.
3. combined type light-splitting element according to claim 1, wherein this refraction structure of this refracting element is the refraction structure of one dimension or two dimension.
4. combined type light-splitting element according to claim 3, wherein this refraction structure of this refracting element is an optical grating construction, the cycle is between 0.1～10 λ.
5. combined type light-splitting element according to claim 3, wherein this refraction structure of this refracting element is a prism structure, the cycle is between 5～2000 λ.
6. combined type light-splitting element according to claim 1, this refraction structure wherein, also the level refraction structure once in each zones of corresponding those band of light respectively.
7. combined type light-splitting element according to claim 1, wherein this folding diffraction element is formed by the polarisation material.
8. combined type light-splitting element according to claim 1, wherein this refracting element is formed by the polarisation material.
9. combined type light-splitting element according to claim 1 also comprises a polarizing layer, and this polarizing layer is positioned at the front end of this folding diffraction element, make this light beam be introduced into this polarizing layer after, enter this folding diffraction element again.
10. combined type light-splitting element according to claim 1 also comprises a polarizing layer, this polarizing layer between this folding diffraction element and this refracting element, make those band of light of having separated be introduced into this polarizing layer after, enter this refracting element again.
11. combined type light-splitting element according to claim 1, wherein those lenticules of this folding diffraction element are respectively the identical little diffraction lens of shape, this slightly the diffraction lens can be little diffraction lens of focus type.
12. combined type light-splitting element according to claim 1, wherein those lenticules of this folding diffraction element are to arrange one-period, and for curvature is positive a plurality of convex lens, this cycle is between 5～2000 λ.
13. combined type light-splitting element according to claim 12, wherein those lenticules of this folding diffraction element are the prismatic mirror of one dimension or the convex lens of two dimension.
14. combined type light-splitting element according to claim 1, wherein this periodicity optical grating construction of this folding diffraction element is polygon or wedge structure.
15. combined type light-splitting element according to claim 1, wherein this periodicity optical grating construction of this folding diffraction element is one dimension or two-dimensional grating structure, is arranged between 0.1～10 λ one-period.
16. combined type light-splitting element according to claim 1, wherein this refraction structure of this refracting element is positioned at the exit end that those band of light enter an incident end of this refracting element or are positioned at those these refracting elements of band of light outgoing.
17. combined type light-splitting element according to claim 1, wherein an incident direction of an exit direction of those band of light and this light beam is pressed from both sides a special angle, and this angular range is 0 °～60 °.
18. combined type light-splitting element according to claim 1, wherein the distance of this second surface of this folding diffraction element and this refracting element is 0.1mm～30mm.
19. combined type light-splitting element according to claim 1, this light beam that wherein enters this combined type light-splitting element is polarized light or nonpolarized light.
20. combined type light-splitting element according to claim 1, wherein should roll between diffraction element and this refracting element be an air or a transparent material layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810133731A CN101634753A (en) | 2008-07-25 | 2008-07-25 | Combined type light-splitting element and imaging device |
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| CN200810133731A CN101634753A (en) | 2008-07-25 | 2008-07-25 | Combined type light-splitting element and imaging device |
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| CN101634753A true CN101634753A (en) | 2010-01-27 |
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| CN200810133731A Pending CN101634753A (en) | 2008-07-25 | 2008-07-25 | Combined type light-splitting element and imaging device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106908993A (en) * | 2017-03-06 | 2017-06-30 | 合肥鑫晟光电科技有限公司 | A kind of backlight module and liquid crystal display |
| CN106959550A (en) * | 2016-01-08 | 2017-07-18 | 京东方科技集团股份有限公司 | A kind of optical modulator, backlight source module and display device |
| CN109709720A (en) * | 2019-02-25 | 2019-05-03 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN113703175A (en) * | 2021-09-10 | 2021-11-26 | 江西欧迈斯微电子有限公司 | Diffractive optical element, projection module, and electronic apparatus |
-
2008
- 2008-07-25 CN CN200810133731A patent/CN101634753A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106959550A (en) * | 2016-01-08 | 2017-07-18 | 京东方科技集团股份有限公司 | A kind of optical modulator, backlight source module and display device |
| CN106959550B (en) * | 2016-01-08 | 2024-04-16 | 京东方科技集团股份有限公司 | Optical modulator, backlight source module and display device |
| CN106908993A (en) * | 2017-03-06 | 2017-06-30 | 合肥鑫晟光电科技有限公司 | A kind of backlight module and liquid crystal display |
| WO2018161669A1 (en) * | 2017-03-06 | 2018-09-13 | 京东方科技集团股份有限公司 | Backlight module and liquid crystal display device |
| US10613375B2 (en) | 2017-03-06 | 2020-04-07 | Boe Technology Group Co., Ltd. | Backlight module and liquid crystal display device |
| CN109709720A (en) * | 2019-02-25 | 2019-05-03 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN109709720B (en) * | 2019-02-25 | 2022-06-03 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN113703175A (en) * | 2021-09-10 | 2021-11-26 | 江西欧迈斯微电子有限公司 | Diffractive optical element, projection module, and electronic apparatus |
| CN113703175B (en) * | 2021-09-10 | 2023-01-13 | 江西欧迈斯微电子有限公司 | Diffractive optical element, projection module, and electronic apparatus |
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Application publication date: 20100127 |