CN101625458B - Compound type light splitting element - Google Patents
Compound type light splitting element Download PDFInfo
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- CN101625458B CN101625458B CN2008101360687A CN200810136068A CN101625458B CN 101625458 B CN101625458 B CN 101625458B CN 2008101360687 A CN2008101360687 A CN 2008101360687A CN 200810136068 A CN200810136068 A CN 200810136068A CN 101625458 B CN101625458 B CN 101625458B
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Abstract
The invention relates to a compound type light splitting element capable of receiving light beams which are at least mixed with a plurality of wave bands of light. The light splitting element comprises a first optical diaphragm and a second optical diaphragm. The first optical diaphragm is provided with a plurality of micro-structure lenses with the same shape, and the micro-structure lenses are used for generating a deviation of a gathering degree to incident light. The second optical diaphragm is provided with a plurality of periodic polygonal structures used for receiving deviation light and emitting the formation wave band light of light beams respectively to a preset area on a plane according to the separation of the wavelength in space.
Description
Technical field
The invention relates to a kind of combined type light-splitting element, a plurality of band of light can be separated, can be applicable to image display apparatus.
Background technology
The main function one of beam splitter for example is can be with white light beam split (dividing) 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 by 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 processing procedure of colored filter itself is very loaded down with trivial details in addition, and each primary colors need use above together semiconductor gold-tinted processing procedure at least, and cost is high.
The dealer still continues to research and develop optical elements sets, for example wish to replace colored filter, under the situation of keeping the height optical efficiency, can produce corresponding to panel pixel and vertical incidence liquid crystal layer three primary colors.
Summary of the invention
The invention provides a kind of combined type light-splitting element, need not colored filter, incident light can be isolated multiple primitive color light according to the wavelength difference of coloured light, for example can be for the use of image display apparatus.
The invention provides a kind of combined type light-splitting element, receive a light beam.This light beam has a plurality of band of light of mixing at least.Beam splitter comprises one first blooming piece and one second blooming piece.First blooming piece has the identical a plurality of microstructure lens of shape, and these microstructure lens have asymmetric column-shape curved surface, and each these microstructure lens receives this light beam has an aggregation extent with generation a deviation light.Second blooming piece has a plurality of periodicity polygonized structures, receives those deviation light so that those band of light of this light beam are separated, and again according to a plurality of wavelength of those band of light, makes respectively and penetrates to the presumptive area on a plane.
In the combined type light-splitting element of one embodiment of the invention, for example those band of light of being separated by this second blooming piece are parallel in fact with this light beam.
In the combined type light-splitting element of one embodiment of the invention, after for example this second blooming piece separates those band of light,, this presumptive areas of a plurality of subpixel of the corresponding pixels of those band of light is penetrated according to a diffraction effect of setting.
In the combined type light-splitting element of one embodiment of the invention, for example this second blooming piece is a prism grating sheet.
In the combined type light-splitting element of one embodiment of the invention, those microstructure lens of this first blooming piece for example, a plurality of pixels of corresponding an array are provided with respectively.
In the combined type light-splitting element of one embodiment of the invention, for example this first blooming piece comprises: a micro-lens sheet has a plurality of lenticules; And a lenticular lenses, there is a plurality of low-light grid unit to be combined into those microstructure lens with those lenticules respectively.
In the combined type light-splitting element of one embodiment of the invention, for example each of those raster units is the optical texture of refractive power again.
In the combined type light-splitting element of one embodiment of the invention, for example this micro-lens sheet and this grating are single blooming pieces of structural entity again.
In the combined type light-splitting element of one embodiment of the invention, for example this micro-lens sheet is two blooming pieces that structure is separated with this grating again.
In the combined type light-splitting element of one embodiment of the invention, for example this first blooming piece comprises a micro-lens sheet, a plurality of lenticules are arranged, wherein those lenticular each have a first surface and a second surface, simultaneously this light beam is produced this deviation light of this aggregation extent.
In the combined type light-splitting element of one embodiment of the invention, for example those lenticular these first surfaces of this first blooming piece and this second surface comprise a smooth surface and a plane again.
In the combined type light-splitting element of one embodiment of the invention, for example those lenticular these first surfaces of this first blooming piece are that one of a corresponding smooth surface subtracts thick structure with this second surface again.
In the combined type light-splitting element of one embodiment of the invention, for example this first blooming piece and this second blooming piece are single blooming pieces of structural entity.
In the combined type light-splitting element of one embodiment of the invention, be that each subpixel to a display provides light source of the same colour for example from those band of light of this second blooming piece outgoing.
The present invention also provides a kind of combined type light-splitting element, receives an incident beam.This light beam has a plurality of band of light of mixing at least.Combined type light-splitting element comprises a blooming piece, has a light incident surface and a light exit surface.Wherein, have the identical a plurality of microstructure lens of shape on this light incident surface, these microstructure lens have asymmetric column-shape curved surface, and each microstructure lens produces and assembles and deviation this incident beam.Have periodic a plurality of polygonized structure on this light exit surface, it separates it to the incident beam through incidence surface by different wave length in the space.
In the combined type light-splitting element of one embodiment of the invention, the shape of those microstructure lens on this light incident surface for example is that a smooth surface or a corresponding smooth surface are cut apart and subtracted a thick structural plane.
In the combined type light-splitting element of one embodiment of the invention, for example those microstructure lens are that a plurality of pixels of a corresponding display element array are provided with.
In the combined type light-splitting element of one embodiment of the invention, for example those polygonized structures of this light exit surface are right-angle prism structures.
In the combined type light-splitting element of one embodiment of the invention, for example those polygonized structures of this light exit surface will be by this light beam of those microstructure lens, isolate those band of light by optics diffraction mechanism, penetrate to a plurality of presumptive areas on a plane.
In the combined type light-splitting element of one embodiment of the invention, for example this presumptive area on this plane is a plurality of sub-pixel position of a display panels.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, some embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Figure 1A～Fig. 1 C illustrates according to one embodiment of the invention, and combined type light-splitting element is applied in the diagrammatic cross-section of image display apparatus system.
Fig. 2 illustrates according to one embodiment of the invention, the beam split schematic diagram of mechanism of corresponding diagram 1.
Fig. 3 illustrates according to the embodiment of the invention, and one simplifies the analog result synoptic diagram.
Fig. 4 A～Fig. 4 C illustrates according to another embodiment of the present invention, and combined type light-splitting element is applied in the diagrammatic cross-section of image display apparatus system.
Fig. 5 illustrates according to another embodiment of the present invention, and combined type light-splitting element is applied in the diagrammatic cross-section of image display apparatus system.
Fig. 6 A～Fig. 6 D illustrates another embodiment again according to the present invention, and combined type light-splitting element is applied in the diagrammatic cross-section of image display apparatus system.
Fig. 7 A～Fig. 7 B illustrates the diffraction schematic diagram of mechanism that adopts according to the embodiment of the invention.
Fig. 8 A～-10B illustrates other embodiment again according to the present invention, the diagrammatic cross-section of the microlens structure of combined type light-splitting element.
Figure 11 A～Figure 11 C illustrates the diagrammatic cross-section that subtracts thick process according to the microlens structure of binary optical principle.
Figure 12 A～Figure 12 C illustrates other embodiment again according to the present invention, and combined type light-splitting element is applied in the diagrammatic cross-section of image display apparatus system.
Figure 13 illustrates according to the embodiment of the invention, the cross-sectional view of image apparatus system.
The main element symbol description
100: micro-lens sheet
100a: lenticule
102,122: lenticular lenses
104,124: the diffraction grating sheet
100m, 102m: the optical grating construction of diffraction
106,126: image display apparatus
108: light beam
110,116: blooming piece
112: the first blooming pieces
114: the second blooming pieces
120: parallel beam
130: raster unit
132: the lenticule unit
134,136,140,150,160: the lenticule unit
134a, 136a, 140a, 150a, 160a: asymmetric curved surface
134b, 136b, 140b, 150b, 160b: tabular surface
170: backlight module
172: polarization layer
174: blooming piece
176: the diffraction grating sheet
178: image apparatus
180: light source
200: incident angle
202: ruddiness
204: green glow
206: blue light
Embodiment
Combined type light-splitting element of the present invention, its beam split mechanism for example can be made up of the blooming piece of two-layer periodic polygonized structure.The periodic polygonized structure of ground floor produces the congregational rate of a predetermined extent to incident light and to the deviation of light going direction.The periodic polygonized structure of the second layer is formed wavelength to the difference of deviation radiant and is carried out open score, and the light beam that different wave length is formed spatially separates by wavelength, and for example still can be parallel to the outgoing of former incident light direction haply by the light beam of open score.In the multiple application of the present invention, for example utilize colored filter (the color filter in blooming piece replacement display panel, image sensor or the colour camera that contains two-layer polygonized structure, CF), so can increase optics service efficiency and the complexity of simplifying original system at least.
The periodicity polygonized structure of ground floor, constitute a plurality of microstructure lens, suitably deviation and gathering of the light beam that will pass through respectively relends the periodicity polygonized structure by the second layer, according to optics diffraction mechanism the different-waveband light in the light beam is separated to predetermined direction or position.Periodically polygonized structure for example with general periodic polygonal optical structure, grating for example again.Optical grating construction of the present invention also for example is the formula grating that glitters, and it is a kind of grating that has spectrophotometric result and diffraction efficient concurrently.It is by adjusting the relative angle of incident light with the grating inclined-plane, makes that the refractive direction of diffraction direction of light when being plane of refraction with grating facet (Facet) is identical, and diffraction optics efficient can reach maximum in diffraction direction (or refractive direction of Facet) at this moment.
The present invention also for example in conjunction with periodic polygon aspheric mirror with glitter the formula grating, can be controlled in to put before the direct of travel that does not influence light and obtain high efficiency open score light beam.On using, the present invention for example can replace traditional colored filter, and raises the efficiency.The present invention also can further can utilize polarization of incident light, when making it be applied to panel or optical-mechanical system, compared to the system of tradition use colored filter, can improve the service efficiency of light.
The present invention for some embodiment as description, but the present invention not only be limited in for some embodiment.In addition, for some embodiment between also can make mutually suitable to changing.
Figure 1A～Fig. 1 C illustrates the embodiment of three-chip type framework of the present invention, is applied in the diagrammatic cross-section of image display apparatus system for combined type light-splitting element.Consult Figure 1A, combined type light-splitting element for example is divided into first blooming piece and second blooming piece.In the present embodiment, first blooming piece for example is made up of a micro-lens sheet 100 and a prismatic lens 102.Wherein, the structure example of prismatic lens 102 is the structure of grating in this way, can be designed to bigger grating of cycle according to the resolution of pixel.Micro-lens sheet 100 has a plurality of lenticule 100a, and it for example is to be centrosymmetric lenticule with lens curved surface, and it for example is the face of cylinder or the lenticule of sphere again.This curved surface is in order to produce congregational rate.Lenticule for example is that a plurality of pixel locations that correspondence is arranged on the back are provided with.It can be one dimension or the column of Two dimensional Distribution or strip/spherical lens elements.Figure 1A is for example at the synoptic diagram of a plurality of pixels on the scanning linear.Prismatic lens 102 has a plurality of microprisms unit to be combined into the microstructure lens with lenticule 100a respectively.Microstructure lens receiving beam 108 has a deviation light of an aggregation extent with generation.The path of light is the gathering that some degree arranged in order to expression and function to light direct of travel deviation among the figure.The prism unit of prismatic lens 102 is polygonal structures, and it for example is a right-angle prism.Yet micro-lens sheet 100 and the microstructure lens that prismatic lens 102 is constituted can be done other according to needed function and change design, need not be limited in illustrated embodiment.For example aftermentioned also can be described in several design variation under the function of wanting.
The light beam 108 of incident for example is the light that is mixed by a plurality of primitive color lights, for example is white light.A plurality of primitive color lights are divided into a plurality of band of light according to wavelength, and it for example is the primaries of RGB (RGB), but according to actual needs, other primitive color lights also can be suitable for.
Can incide second blooming piece, for example be diffraction grating sheet 104 through the light beam 108 of micro-lens sheet 100 and prismatic lens 102.The a plurality of periodicity polygonized structures of diffraction grating sheet 104 tools receive the light beam of assembling with deviation 108, so that a plurality of band of light of light beam 108 are separated.For example, make respectively and penetrate to the presumptive area on a plane according to a plurality of wavelength R, G, the B of band of light.Its plane for example is the plane of incidence of an image display apparatus 106, for example is a plurality of sub-pixel position of a plurality of pixels of a cell array in the presumptive area of this plane of incidence.
Generally can understand, a color pixel is formed, for example is made up of three subpixel of R, G, B by several subpixel, blends desired color light according to its other shade of gray.The present invention need not colored filter, directly by the optics diffraction effect of diffraction grating sheet 104 and the mutual relationship of wavelength, a plurality of band of light are separated, but separated a plurality of band of light still can be kept identical direct of travel haply, in predetermined sub-pixel position incident.
Consult Figure 1B, compare with Figure 1A, the lens curved surface of micro-lens sheet 100 is not limited to lower surface (lower surface is defined as light entrance face), also can place upper surface (upper surface is defined as light-emitting face), decides on processing procedure or design.The structural plane of prismatic lens 102 is not limited to lower surface, also can place upper surface, decides on processing procedure or design.The structural plane of diffraction grating sheet 104 also is not limited to lower surface, also can place upper surface, decides on processing procedure or design.Consult Fig. 1 C, in the present embodiment, micro-lens sheet 100 can exchange with prismatic lens 102 positions, wherein the structural plane of the lens curved surface of micro-lens sheet 100 and prismatic lens 102 all can place upper surface or lower surface (lower surface is defined as light entrance face), simultaneously, the structural plane of diffraction grating sheet 104 also is not limited to lower surface, also can place upper surface, decides on processing procedure or design.The framework of Figure 1A, 1B and 1C be of the present invention may embodiment, under the situation of keeping the height optical efficiency, can produce corresponding to panel pixel and near the vertical incidence liquid crystal layer three primary colors.
Fig. 2 illustrates beam split schematic diagram of mechanism of the present invention.Consult Fig. 2, when the white light of the incident light beam by micro-lens sheet 100 and prismatic lens 102 can enter diffraction grating sheet 104.Diffraction grating sheet 104 is isolated red bluish-green primaries with white light, and it incides image display apparatus 106, corresponds to three subpixel of each pixel.Fig. 3 illustrates the embodiment of the invention, is a simplification analog result synoptic diagram.Consult Fig. 3, parallel beam 120 incides lens 122, and the light entrance face of lens 122 is a curved surface, and this curvature of curved surface radius value is very big, is difficult for being found out by diagram, and its function is to make light to assemble, and light-emitting face is an inclined-plane, makes light deflection.And produce deviation and congregational rate, shown in the enlarged drawing on Fig. 3 top.Then incide diffraction grating sheet 124.Because the effect of lens 122, light beam incides diffraction grating sheet 124 and has an incident angle, to adjust the exit direction of diffraction grating sheet 124.Therefore the direct of travel of the primitive color light of outgoing is also kept identical with the direct of travel of going into light beam 120 haply.
The phenomenon of diffraction is please consulted Fig. 7 A earlier.The diffraction schematic diagram of mechanism that the embodiment of the invention that illustrates Fig. 7 A adopts.With little right-angle prism is that the grating of unit is an example, and little right-angle prism unit has the fixing cycle.The cycle of little right-angle prism can determine the angle of diffraction, and the degree of depth can determine the assign direction of diffraction efficient.For example, when incident light enters second group of periodic polygonized structure, be divided into three kinds of primitive color lights of RGB.If the cycle is p, ruddiness (R) 202, green glow (G) 204 are respectively λ r with the wavelength of blue light (B) 206, λ g, and λ b represents.According to grating formula, suppose that incident light is a vertical incidence, when this three coloured light was got m diffraction rank, the diffraction angle was respectively:
Since incident light through first group periodically be the light beam of coalescence deviation for a moment behind the polygonized structure, so an incident angle θ i 200 is arranged.According to the above-mentioned relation formula and adjust its parameter, periodically the cycle of polygonized structure makes each coloured light of outgoing can deviation return direction with original initial input path near parallel for second group of may command.That is three coloured light near parallel to each other but be spaced a distance, and respectively near the pairing liquid crystal layer pixel of vertical incidence.
Can be during practical application according to the demand of system, the external form of the polygonized structure of control cycle.For example consult Fig. 7 B, in the present embodiment, change optical grating construction and can make the RGB distribution sequence distribute opposite with the RGB of Fig. 7 B.For example working as polygonized structure is the formula grating that glitters that material constituted of cycle 4 microns polymethylmethacrylate (PMMA), its refractive index about 1.5.For the oblique incidence light of an incident angle θ i 200 for-7.81o, if utilize the negative single order diffracted beam of this grating, then the grating bosom is about 1 micron.Show that according to simulation when lambda1-wavelength was 436nm, 544nm, 611nm respectively, its efficient at negative single order diffracted beam was about 75%, 84% and 79% respectively, and the diffraction angle θ b of negative single order, θ g, θ r then are respectively 1.56o, 0o, and 0.97o.Fit into choosing of firing angle, the angle of outgoing has difference according to actual design, and it preferably for example is to spend between 60 degree 0.
According to the desired optical function of above-mentioned design, in the design of optical element, multiple design variation can be arranged.Below describe for some embodiment again.Fig. 4 A～Fig. 4 C illustrates the embodiment of two-piece type framework of the present invention, and combined type light-splitting element is applied in the diagrammatic cross-section of image display apparatus system.Consult Fig. 4 A, it is machine-processed similar to Figure 1A～Fig. 1 C's, yet is the blooming pieces 110 that are integrated into the single structure body for micro-lens sheet 100 with prismatic lens 102.In other words, with identical material, at the curved surface that simultaneously is made into lens, another side directly forms the needed geometrical layout of prismatic lens, so can simplify the package assembly of blooming piece, and keeps predetermined effect.The curved surface of the lenticule face 100 of present embodiment provides the function of gathered light, and prism facets is based on a plane inclined, so that the effect of deviation to be provided.In the present embodiment, the structural plane of diffraction grating sheet 104 also can place upper surface (that is light-emitting face) except that being positioned at shown in Fig. 4 A the lower surface (that is light entrance face) in addition.Consult Fig. 4 B, it is machine-processed similar to Fig. 4 A's, and in the present embodiment, lenticule face 100 can exchange with prism facets 102 positions.Consult Fig. 4 C, it is machine-processed similar to Fig. 4 B's, and in the present embodiment, the structural plane of diffraction grating sheet 104 places upper surface (that is light-emitting face).
Fig. 5 illustrates another embodiment of two-piece type framework of the present invention, and combined type light-splitting element is applied in the diagrammatic cross-section of image display apparatus system.Consult Fig. 5,, for example be called first blooming piece 112 again, do design variation again according to desired function for blooming piece 112.First blooming piece 112 of present embodiment also is to be example with the monomer structure integrated, however the one side of lens, and for example light entrance face is asymmetric column-shape curved surface, and one side (that is light-emitting face) for example can be to keep not have plane inclined in addition.Asymmetric column-shape curved surface produces the effect of assembling with deviation to incident beam simultaneously.In addition, for blooming piece 114, for example be called second blooming piece 114 again, the structure of its diffraction grating can be arranged on the one side on the substrate, for example is than (that is light-emitting face) on the back side away from blooming piece 112.That is to say that the direction of second blooming piece 114 is opposite with the direction of second blooming piece 104 of Fig. 4, but the diffraction effect still can keep, three band of light of RGB are separated.
Fig. 6 A～Fig. 6 D illustrates the embodiment according to one chip framework of the present invention, and combined type light-splitting element is applied in the diagrammatic cross-section of image apparatus system.Consult Fig. 6 A, in the present embodiment, once again aforesaid two blooming pieces are integrated into monomer structure, to form single blooming piece 116.Single blooming piece 116 for example is that the blooming piece 112 with Fig. 5 combines with blooming piece 114.The optical grating construction that produces diffraction can directly be formed at the another side of blooming piece 116, or the planar substrates of aforesaid blooming piece 114 is sticked on the plane of blooming piece 112, to form whole blooming piece 116.Consult Fig. 6 B, in the present embodiment, if change the frame mode of the diffraction grating of single blooming piece 116 its upper surfaces, can control the direction of RGB beam split indirectly, the frame mode that this kind changes diffraction grating divides the mode of light direction also to can be applicable among above-mentioned all embodiment with indirect control RGB.
Consult Fig. 6 C and Fig. 6 D, optical grating construction 100m, the 102m of diffraction can also directly be formed at the upper surface of blooming piece 110.In other words, diffraction grating structure 100m, 102m also can directly be produced on the curved surface or prism inclined-plane of structure.
Fig. 8～Figure 10 illustrates according to embodiments of the invention, and the diagrammatic cross-section of the microlens structure of combined type light-splitting element changes in order to different matched combined to be described.Consult Fig. 8 A, the prism unit 130 of deviation incident light for example can be arranged in light incident side, and to receive irradiating light beam, the lenticule unit 132 of symmetry then is placed in thereafter.So arrange also can reach the effect of deviation and optically focused.Consult Fig. 8 B, compare with Fig. 8 A, prism unit 130 is changed with the order of lenticule unit 132, but still can keep the effect of similar deviation and optically focused, though its two actual light path can be slightly variant and produce in various degree deviation and spotlight effect, yet according to the actual demand that needs to design also is that the multiple variation of the present invention one of is selected, and the shown several combinations of Fig. 8 C～Fig. 8 H can be for example consulted in all the other variations, or according to other combination and variation under the identical optical principle.Blooming piece 114 among diffraction grating sheet among Fig. 1 104 and Fig. 5 is as spectrophotometric unit in addition, if the upper surface or the lower surface that change the direction of beam-splitting structure and be positioned at substrate all can cause required optics spectrophotometric result, consulting Fig. 9 A～Fig. 9 D, can also be that multiple variation one of is selected according to the actual demand that needs to design during use.
Consult Figure 10 A, lenticule unit 134 for example is the monomer structure of integrating, and it has an asymmetric curved surface 134a and a tabular surface 134b.Tabular surface 134b tiltable or do not tilt, the design of wherein not tilting helps doing contraposition and integration with follow-up blooming piece.In addition, for example also based on the consideration of component thickness, the structure of Figure 10 A is design variation once again, to reduce lens thickness.Consult Figure 10 B, lenticule unit 136 is that variation is done on the basis with the structure of Figure 10 A.The tabular surface 136b of lenticule unit 136 for example is identical with the tabular surface 134b of lenticule unit 134.Yet concavo-convex structural plane 136a is a corresponding smooth surface, and for example asymmetric curved surface 134a can do according to the principle of binary optical and cut apart and subtract thick structural plane.136 pairs of light deflections in this lenticule unit and congregational rate still can be kept, and the while can be kept less and is thin thickness substantially, but mitigation system weight and volume.The principle of its binary optical is as described below.During optical design, the optical field distribution after the fluctuating may command incident light of a lens surface passes through, it is former because the fluctuating of lens surface provides incident light one phase change.
Figure 11 A is depicted as the pairing lens height of a continuous phase function to be changed.According to the optics diffraction theory, this continuous phase function can deduct the phase value of 2 π integral multiples and is modulated onto between 0～2 π at centre wavelength, the result sees also Figure 11 B, the maximum height of this kind body structure surface can be provided by formula dmax=λ (n-1), and wherein n is the refractive index of lens material at λ.In order to simplify manufacture process, PHASE DISTRIBUTION can be quantized into N discrete height, is the PHASE DISTRIBUTION of 2 π/N, and it is similar to the surface distributed with multiple-rank arrangement.The height of each step is dM=dmax/2M in N step, N=2M for example wherein, and M is a natural number, shown in Figure 11 C.The one of this kind structure is characterized as the distribution effect of lenticule unit after to the light outgoing and still can keeps, but can keep less and be thin thickness substantially.
See also Figure 12 A again, for the arrangement of two blooming pieces, its microstructure lens for example are to comprise lenticule unit 140 and diffraction grating sheet 142.Lenticule unit 140 for example adopts the structure among Fig. 4, and its smooth surface 140a is a symmetroid, and tabular surface 140b is the tabular surface that tilts.Diffraction grating sheet 142 is to be arranged in 140 minutes with the lenticule unit.Consult Figure 12 B again, lenticule unit 150 for example is the structure that adopts Figure 10 A, and its smooth surface 150a is an asymmetric design, and tabular surface 150b for example is not tilt.Apprehensible at this is whether tabular surface 150b tilts to depend on to cooperate the operating parts of diffraction grating sheet 152 to do whole the adjustment.Lenticule unit 150 designs of present embodiment have the deviation and the aggregation capability of enough degree, so smooth surface 150a is an asymmetric design.The tabular surface 150b of adjacent lenticule unit 150 is consistent, so lenticular lenses 152 can directly make or stick on the smooth surface 150b, to reach the design of monomer structure.Ginseng Figure 12 C, lenticule unit 160 for example is the structure that adopts Figure 10 B, has tabular surface 160b and non-smooth surface 160a.As described above, lenticular lenses 162 can be integrated into monomer structure with lenticule unit 160.
In sum, the present invention for doing suitable combination between a plurality of embodiment, do design variation according to actual needs.The present invention also be not limited only to for a plurality of embodiment.
Consider then that in the application of image display apparatus for example can cooperate increases a polarization layer (polarizer).Figure 13 illustrates according to another embodiment of the present invention, the cross-sectional view of image display apparatus system.Consult Figure 13, image display apparatus 178 for example is to be that example illustrates with the liquid crystal indicator.If (charge coupled device, in the time of CCD), still with, and to be light source the come from the outside object of difference therebetween, all the other frameworks are similar for its principle to be applied to the colour charge coupling element that other system for example is digital camera or colour camera.
Image apparatus 178 needed light sources 180 are to be produced by a backlight module 170.The light source 180 that backlight module 170 produces face generally is not have polarization effect, and it for example is the light that is mixed with the P polarization state by the S polarization state.Light source 180 for example is polarized into the light source 180 of S polarization state after by a polarization layer 172.Then, light source 180 is again by a blooming piece 174.Blooming piece 174 has microlens structure as described above, and the light source 180 that passes through microlens structure is respectively assembled and deviations.Light source 180 is then by diffraction grating sheet 176.According to the design of diffraction grating sheet 176, cooperate the size of deviation incident angle, by the light source 180 of diffraction grating sheet 176, can isolate three band of light of RGB, enter image display apparatus 178 toward image display apparatus 178 with equidirectional haply.Sub-pixel position on the image display apparatus 178 cooperates the incoming position of RGB band of light, constitutes a color pixel.Therefore, present embodiment need not to use colored filter to reach.
With regard to polarization layer 172, the incident light of former not polarization has P light and S light composition.Because of repeatedly travelling to and fro between between polarization layer and reflection horizon back and forth, making emergent light is particular polarization, for example S light.Can do optimization (optimization) with periodic polygonized structure this moment at this kind polarized light, with the efficient of the open score emergent light of a certain polarization direction of further raising.
The realization of Microstructure Optics element of the present invention can utilize gold-tinted processing procedure or Ultraprecision Machining to process on the metal die with shaping monocrystalline diamond cutter, utilizes injection molding, produces the finished product of micro optical element.
Key element is to form periodically polygonized structure.To be applied to panel is example, first group of this element periodically polygonized structure have the function of dwindling beam diameter and deviation incident light direction concurrently, and second group can produce spectrophotometric result.And this moment, employed light source was preferably light beam based on three primary colors, and it for example can be LED or the CCFL of RGB again, has trichromatic spectrum, for example is respectively R (611nm), and G (544nm) reaches B (436nm).
Behind the light outgoing backlight module 170, enter graphical presentation system with directional light.With regard to effect, each subsection, the position of corresponding pixel is equivalent to the synthetic of refracting prisms and a convergent lens.Considering for example it to be designed to the lens pattern of an aspheric surface pattern on the simplification processing procedure.The purpose of assembling light beam is to make incident light near the focus of each coloured light after the beam split is positioned at liquid crystal layer or photo-sensitive cell, in order to the processing and the minimizing of light signal crosstalk (cross-talk).When for example being applied to panel system, if its pixel size is 219X219 μ m
2, then assemble the bundle that contracts through first group of periodicity polygonized structure.
With regard to the function of reality, in one embodiment of the invention, the high-level efficiency beam splitter can comprise first blooming piece, and the microstructure lens that a plurality of shapes of tool are identical are to the function of incident light tool convergence with the deviation light beam.Second blooming piece, the a plurality of periodicity polygonized structures of tool, it carries out open score to the different wave length of forming through the incident light source of first blooming piece, light beam is separated by different wave length in the space, and can be parallel to the outgoing of former incident light direction or press from both sides a special angle outgoing with the direct of travel of former incident light by each wavelength light beam of open score, angular range for example is 0 °～60 °.
Wherein for example, first blooming piece tool light incident surface and the light exit surface, the microstructure lens that shape is identical can form on the light incident surface or on the light exit surface on demand.
Wherein for example, the microstructure lens that shape is identical on first blooming piece can be a smooth surface or are a diffraction microstructure face, and its shape is difference with the material light refractive index, and tool is assembled the function with deviation light.
Wherein for example, second blooming piece tool light incident surface and the light exit surface, periodically polygonized structure can be on demand forming on the light incident surface or on the light exit surface.
Wherein for example, the periodicity polygonized structure on second blooming piece can be glitter formula grating, polygon grating or sub-wavelength grating, and its grating cycle is between 0.1 λ～10 λ.
Wherein for example, microstructure lens that shape is identical on first blooming piece and the periodicity polygonized structure on second blooming piece are one-dimentional structure.
Wherein for example, microstructure lens that shape is identical on first blooming piece and the periodicity polygonized structure on second blooming piece are two-dimensional structure.
Wherein for example, when being applied to the optical-mechanical system of arranging in pairs or groups with TFT-LCD, the focus that this compound beam splitter is handled the color dispersing light beam of back institute outgoing to incident light source can be arranged in the liquid crystal layer.When it for example can be increased in the assembling contraposition, the margin tolerance of this compound beam splitter and liquid crystal layer.
Wherein for example, this compound beam splitter can be applicable to optical-mechanical systems such as panel, colour camera, digital camera.
The high-level efficiency beam splitter also can be designed to monomer structure in addition, comprises a blooming piece tool light incident surface and a light exit surface.Identical microstructure lens of a plurality of shapes of tool for example on the light incident surface are assembled and the function of deviation light beam the incident light tool.A plurality of periodicity polygonized structures of tool for example on the light exit surface, it carries out open score to the different wave length of forming through the incident light source of incidence surface, light beam is separated by different wave length in the space, and can be parallel to the outgoing of former incident light direction or press from both sides a special angle outgoing with the direct of travel of former incident light by each wavelength light beam of open score.Angular range for example is 0 °～60 °.
The present invention is with regard to basic feature, is by position deviation and the gathering with the corresponding pixel of light beam of the structure of lens, utilizes the diffraction grating structure that different colours light is separated.Lens arrangement and diffraction grating structure can have multiple combination, more can be the optical textures of monomer.The present invention can reduce the use of optical filter.
Though the present invention with all 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, and this light beam has a plurality of band of light of mixing at least, and this combined type light-splitting element comprises:
One first blooming piece has the identical a plurality of microstructure lens of shape, and wherein these microstructure lens have asymmetric column-shape curved surface, and each these microstructure lens receives this light beam has an aggregation extent with generation a deviation light;
One second blooming piece has a plurality of periodicity polygonized structures, receives those deviation light, those band of light of this light beam is separated, and according to a plurality of wavelength of those band of light, make respectively and penetrate to the presumptive area on a plane.
2. combined type light-splitting element according to claim 1, wherein those band of light of being separated by this second blooming piece are parallel in fact with this beam center wave band.
3. combined type light-splitting element according to claim 1 after wherein this second blooming piece separates those band of light, according to a diffraction effect of setting, penetrates this presumptive areas of a plurality of subpixel of the corresponding pixels of those band of light.
4. combined type light-splitting element according to claim 1, wherein this second blooming piece is a prismatic lens.
5. combined type light-splitting element according to claim 1, those microstructure lens of this first blooming piece wherein, a plurality of pixels of corresponding an array are provided with respectively.
6. combined type light-splitting element according to claim 1, wherein this first blooming piece comprises:
One micro-lens sheet has a plurality of lenticules; And
One lenticular lenses has a plurality of low-light grid unit to be combined into those microstructure lens with those lenticules respectively.
7. combined type light-splitting element according to claim 6, wherein each of those raster units is the optical texture of refractive power.
8. combined type light-splitting element according to claim 6, wherein this micro-lens sheet and this grating are single blooming pieces of structural entity.
9. combined type light-splitting element according to claim 6, wherein this micro-lens sheet is two blooming pieces that structure is separated with this grating.
10. combined type light-splitting element according to claim 1, wherein this first blooming piece comprises a micro-lens sheet, a plurality of lenticules are arranged, wherein those lenticular each have a first surface and a second surface, simultaneously this light beam is produced this deviation light of this aggregation extent.
11. combined type light-splitting element according to claim 10, wherein lenticular this first surface of those of this first blooming piece and this second surface comprise a smooth surface and a plane.
12. combined type light-splitting element according to claim 10, wherein lenticular this first surface of those of this first blooming piece is that one of a corresponding smooth surface subtracts thick structure with this second surface.
13. combined type light-splitting element according to claim 1, wherein this first blooming piece and this second blooming piece are single blooming pieces of structural entity.
14. combined type light-splitting element according to claim 1 is that each subpixel to a display provides light source of the same colour from those band of light of this second blooming piece outgoing wherein.
15. a combined type light-splitting element receives an incident beam, this light beam has a plurality of band of light of mixing at least, and this combined type light-splitting element comprises:
One blooming piece has a light incident surface and a light exit surface,
Wherein have the identical a plurality of microstructure lens of shape on this light incident surface, these microstructure lens have asymmetric column-shape curved surface, and each these microstructure lens produces and assembles and deviation this incident beam,
Wherein have periodic a plurality of polygonized structure on this light exit surface, receive this incident beam, this incident beam is separated by different wave length in the space through this incidence surface.
16. combined type light-splitting element according to claim 15, the shape of those microstructure lens on this light incident surface wherein is that a smooth surface or a corresponding smooth surface are cut apart and subtracted a thick structural plane.
17. combined type light-splitting element according to claim 15, wherein those microstructure lens are that a plurality of pixels of a corresponding display element array are provided with.
18. combined type light-splitting element according to claim 15, wherein those polygonized structures of this light exit surface are right-angle prism structures.
19. combined type light-splitting element according to claim 15, wherein those polygonized structures of this light exit surface will be by this light beam of those microstructure lens, isolate those band of light by optics diffraction mechanism, penetrate to a plurality of presumptive areas on a plane.
20. combined type light-splitting element according to claim 19, wherein this presumptive area on this plane is a plurality of sub-pixel position of a display panels.
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| CN2008101360687A CN101625458B (en) | 2008-07-11 | 2008-07-11 | Compound type light splitting element |
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| CN2008101360687A CN101625458B (en) | 2008-07-11 | 2008-07-11 | Compound type light splitting element |
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| CN101625458B true CN101625458B (en) | 2011-12-21 |
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Cited By (1)
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| TWI612355B (en) * | 2016-05-24 | 2018-01-21 | 宏達國際電子股份有限公司 | Hand-held electronic device and protective case |
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| CN102544171A (en) * | 2010-12-21 | 2012-07-04 | 财团法人工业技术研究院 | Multi-band light collection and energy conversion module |
| CN103234153B (en) | 2013-04-28 | 2015-11-18 | 京东方科技集团股份有限公司 | A kind of direct-light-type backlight and liquid crystal indicator |
| CN103487983A (en) * | 2013-09-17 | 2014-01-01 | 京东方科技集团股份有限公司 | Array substrate, display panel and display device thereof |
| JP2015060121A (en) | 2013-09-19 | 2015-03-30 | 株式会社東芝 | Color filter array and solid-state imaging element |
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| CN106959546A (en) * | 2016-01-08 | 2017-07-18 | 京东方科技集团股份有限公司 | Backlight and display device |
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| CN105974645A (en) * | 2016-07-14 | 2016-09-28 | 京东方科技集团股份有限公司 | Optical structure, display panel and display device |
| CN114265235B (en) * | 2021-11-19 | 2023-03-14 | 江苏双星彩塑新材料股份有限公司 | Composite membrane for direct type non-diffusion plate backlight module |
| CN114200556B (en) * | 2021-12-31 | 2024-03-15 | 嘉兴驭光光电科技有限公司 | Micro-optical lens, preparation method and display system |
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| US5682265A (en) * | 1994-02-18 | 1997-10-28 | Massachusetts Institute Of Technology | Diffractive microstructures for color separation and fusing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5682265A (en) * | 1994-02-18 | 1997-10-28 | Massachusetts Institute Of Technology | Diffractive microstructures for color separation and fusing |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI612355B (en) * | 2016-05-24 | 2018-01-21 | 宏達國際電子股份有限公司 | Hand-held electronic device and protective case |
| US10101582B2 (en) | 2016-05-24 | 2018-10-16 | Htc Corporation | Hand-held electronic device and protective case |
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| CN101625458A (en) | 2010-01-13 |
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