CN100374904C - Optical part and projector - Google Patents
Optical part and projector Download PDFInfo
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- CN100374904C CN100374904C CNB2006100570602A CN200610057060A CN100374904C CN 100374904 C CN100374904 C CN 100374904C CN B2006100570602 A CNB2006100570602 A CN B2006100570602A CN 200610057060 A CN200610057060 A CN 200610057060A CN 100374904 C CN100374904 C CN 100374904C
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Abstract
Optical components and projecting apparatus. The project of this invention is providing the optical components that can improve image's beautiful level formed by light modulation device and the projecting apparatus that have this optical component. As settle means, the optical component (1)of this invention is allocated in streamer outgoing side of liquid panel, comprising : first phase difference film (11), first birefraction panel(12), second phase difference film(13) and second birefraction panel(14). The first birefraction panel(12) has optic axis which in the same direction along liquid panel's black-matrix cancellatus light blocking part. The second birefraction panel(14)has approximate vertical optic axis with the first birefraction panel(12). The ejected light (L1)by optical components separated to four light (L7,L8,L9,L10), the light(L7,L8,L9,L10)are approximately allocated on top of square or rectangle, the approximate square or rectangle has selvage along the black-matrix cancellatus light blocking part.
Description
Technical field
The present invention relates to optics and projector.
Background technology
So far in the past, the light beam that using the optical device that utilized optic modulating device, for example penetrates according to the image information modulation from light source and the projector of enlarging projection.
The optic modulating device that is carried in such optical device constitutes to have relative a pair of substrate and is enclosed in liquid crystal between these substrates, in this a pair of substrate, a substrate is provided with: on-off element such as transistor that form rectangular a plurality of sweep traces and a plurality of data line, is connected with sweep trace with data line and the pixel electrode that is connected with this on-off element.In addition, on another substrate, be formed with black matrix (black matrix), should dispose the transmittance section corresponding with rectangular by black matrix, and have the part of covering except pixel electrodes, have the cancellate light shielding part on 2 limits of approximate vertical with pixel electrode.
Under the optic modulating device with such structure for example carries situation on the projector, if come the light beam from optic modulating device is carried out enlarging projection by projection lens, then because with the rectangular black matrix that has disposed the transmittance section, as shown in Figure 9, projected image G1 looks like mosaic, the degradation of projected image.
Therefore, following method had been proposed in the past (for example, refer to Patent Document 1): at the back level configuration optics 100 of optic modulating device, this optics 100 has as shown in Figure 10: a pair of birefringent plate 101,102, be configured in 1/4 wavelength plate 103 between this a pair of birefringent plate 101,102.And in Figure 10, that illustrate is the figure of the released state of the exploded perspective view of optics 100 and the light that optics 100 is passed through in expression.
Because the light (to the incident light of optics 100) that penetrates from optic modulating device is along one side of the clathrate light shielding part of deceiving matrix or the linearly polarized light that vibrates along the direction vertical with this limit (the arrow Y direction of Figure 10), therefore in optics 100, spend directions (in other words by optical axis with respect to the direction of vibration deflection 45 of incident light, limit inclination 45 degree (the arrow 101A direction of Figure 10) with respect to the clathrate light shielding part of deceiving matrix) first birefringent plate 101 will be separated into extraordinary ray L11 and ordinary light L12 from the light L that optic modulating device penetrates.And, 2 light L11, L12 be will be separated into 1/4 wavelength plate afterwards and circularly polarized light L13, L14 become respectively.And then second birefringent plate 102 by optical axis direction-45 degree (with the direction of the optical axis approximate vertical of first birefringent plate, the arrow 102A direction of Figure 10) tilts is separated into 4 light L15, L16, L17, L18 with above-mentioned 2 light.
Like this, the light that the transmittance section of the black matrix by optic modulating device is penetrated is separated into 4 light L15, L16, L17, L18, as shown in figure 11, forms the projected image G2 of the picture P of the light shielding part of having eliminated black matrix.
The real clear 64-3834 communique (the 7th page) of opening of patent documentation 1 Japan
Yet, in said method, using optical axis is the birefringent plates 101,102 of 45 degree ,-45 degree, separates the light that the transmittance section of the black matrix by optic modulating device is penetrated, so the image represented G2 of light institute of the transmittance section ejaculation of the black matrix by optic modulating device is for as shown in figure 11.Promptly, the part of the light that penetrates by the transmittance section of black matrix is split into respect to the limit of the clathrate light shielding part of black matrix and has departed from the directions of 45 degree, is separated on the summit that 4 light L15, L16, L17, L18 be configured to rhombus (rhombus separation).
; watch the image observation person who projects on the screen etc. to be identified as image attractive in appearance being, the overlapping as shown in Figure 6 image (with reference to the image G of Fig. 6) of light beam institute image represented that obtains is penetrated, separated by optics in the transmittance section of the black matrix by optic modulating device.Promptly, be following situation: the light that penetrates by the transmittance section of black matrix is separated into 4 along 2 vertical limits of the clathrate light shielding part of black matrix, and this light that is separated into 4 is configured to and is roughly square or is roughly (square discrete) on the rectangular summit.
Summary of the invention
The projector that the object of the present invention is to provide the optics of the aesthetics that can improve the image that forms by optic modulating device and have this optics.
Optics of the present invention is configured in the light beam emitting side that has relative a pair of substrate and be enclosed in the optic modulating device of the liquid crystal between these substrates, it is characterized in that above-mentioned optic modulating device has on a substrate among the above-mentioned relative a pair of substrate pixel electrode according to rectangular configuration; And be configured in black matrix on another aforesaid substrate, should be formed with the transmittance section corresponding by black matrix with pixel electrodes, and have the part of covering except pixel electrodes, have the cancellate light shielding part on the limit of approximate vertical, above-mentioned optics begins to have successively from the side of the light beam emitting side that is configured to above-mentioned optic modulating device: will convert first optical element of circularly polarized light from the linearly polarized light that above-mentioned optic modulating device penetrates to; First birefringent plate, it has along the optical axis on one side of the cancellate light shielding part of the black matrix that constitutes above-mentioned optic modulating device; To convert second optical element of circularly polarized light from ordinary light, the extraordinary ray of first birefringent plate to; And incident is from the light beam of above-mentioned second optical element, and have second birefringent plate with the optical axis of the optical axis approximate vertical of above-mentioned first birefringent plate, described first birefringent plate and described second birefringent plate separate width more than or equal to pel spacing 1/3 and smaller or equal to 2/3 of pel spacing.
In such the present invention, make the linearly polarized light that penetrates from optic modulating device become circularly polarized light by first optical element.By becoming circularly polarized light, can utilize first birefringent plate that has along the optical axis on the one side that forms the clathrate light shielding part of deceiving matrix, will be separated into ordinary light and extraordinary ray from the light of optic modulating device.The ordinary light of this moment and the detaching direction of extraordinary ray are the direction along one side of the clathrate light shielding part of black matrix.And, utilize second optical element to make 2 light after the separation become circularly polarized light afterwards, separate this circularly polarized light by having with second birefringent plate of the optical axis of the optical axis approximate vertical of first birefringent plate.Thus, two circularly polarized lights are split on the direction vertical with detaching direction in first birefringent plate, in other words, be split into along with the direction of the another side of above-mentioned one side approximate vertical of the clathrate light shielding part of black matrix on.
In such the present invention, the light that penetrates by the transmittance section of black matrix is separated into 4 light along 2 vertical limits of the grid of the light shielding part that constitutes black matrix by optics, so the light after this separation is configured in and is roughly square or is roughly on the rectangular summit, described square or rectangular edge 2 vertical limits of grid of the light shielding part of black matrix.Thus, can improve the aesthetics of the image that forms by optic modulating device.In addition, because the light that penetrates by the transmittance section of black matrix is separated into 4 along 2 vertical limits of the grid of the light shielding part of black matrix, so dash area that irradiate light forms to the light shielding part by black matrix, in the image that forms by optics, the shade of the light shielding part of black matrix disappears.
Here, though ordinary light in first birefringent plate and second birefringent plate and extraordinary ray separate width be preferably more than equal pel spacing 1/3 and smaller or equal to 2/3, get final product but set according to each hem width degree size (size on the direction vertical with the length direction on limit) of the light shielding part of black matrix, the light after the separation can shine the dash area that is formed by the light shielding part of deceiving matrix and get final product.
In addition, in the present invention, above-mentioned first optical element and second optical element are preferably plastic phase retardation film.
According to such the present invention, can be by optical element being made the slimming that plastic phase retardation film is realized optics.
And, in the present invention, be preferably above-mentioned phase retardation film and have the light wavelength change big wavelength dispersion characteristic of phase differential along with institute's incident.
According to such the present invention, owing to having phase differential, phase retardation film becomes big wavelength dispersion characteristic along with the light wavelength of institute's incident is elongated, so can in very wide wavelength coverage, convert incident light to circularly polarized light from linearly polarized light.
In addition, in the present invention, above-mentioned phase retardation film and above-mentioned birefringent plate are preferably mutually and bond together by acrylic adhesives.
According to such the present invention, can absorb the linear expansion coefficient difference that is accompanied by phase retardation film and birefringent plate and the distortion that produces by bonding agent by plastic phase retardation film and birefringent plate being bonded together by acrylic adhesives.Thus, can access the high optics of permanance.
In addition, can prevent transmitance reduction by using acrylic adhesives through the light of optics.
In addition, in the present invention, the refractive index that is preferably aforesaid propylene acids bonding agent is more than or equal to 1.48 and smaller or equal to the refractive index of above-mentioned phase retardation film.
According to such the present invention, constituting each phase retardation film of optics and each birefringent plate bonds together more than or equal to 1.48 acrylic adhesives by refractive index mutually, can suppress to incide the reflection of light beam on the interface of each phase retardation film and each birefringent plate of the display optical picture on the optics thus, prevent that reflected light from inciding on the optical devices, reflection and produce ghost image (ghost) etc. in the image of institute's projection again.In addition, the refractive index of acrylic adhesives is preferably the value near the refractive index of birefringent plate and phase retardation film.Can reduce to constitute the value of the reflectivity on the interface of each key element of optics thus.In addition, the refractive index of acrylic adhesives is preferably the value of the refractive index that is no more than phase retardation film.If surpassed the refractive index of phase retardation film, then the reflectivity on the interface uprises.
Projector of the present invention has: a plurality of optic modulating devices, it has according to the pixel electrode of rectangular configuration and black matrix, should be formed with the transmittance section corresponding by black matrix with this pixel electrode, and have the part of covering except pixel electrodes, have the cancellate light shielding part on the limit of approximate vertical, this optic modulating device, is modulated the light beam that penetrates from light supply apparatus at every kind of color of light according to image information; Color synthesizing optical device, its light beam that each optical modulation device is modulated synthesizes; And projecting optical device, it is to carrying out enlarging projection by the synthetic color of light of this color synthesizing optical device, form projected image, it is characterized in that, between above-mentioned optic modulating device and above-mentioned projecting optical device, be provided with any one above-mentioned optics.
According to such projector of the present invention, owing to have any one above-mentioned optics, so can improve the aesthetics of the image of institute's projection.
Description of drawings
Fig. 1 is the synoptic diagram of optical system of the projector of expression embodiments of the present invention.
Fig. 2 is the stereographic map of the liquid crystal board of the above-mentioned projector of expression.
Fig. 3 is the sectional view of expression optics of the present invention.
Fig. 4 is the above-mentioned optics of expression, and expression is through the figure of the state of the light of optics.
Fig. 5 is the birefringent figure of the phase retardation film of the above-mentioned optics of expression.
Fig. 6 is the figure of expression by the picture of above-mentioned optics projection.
Fig. 7 is the planimetric map of the variation of the above-mentioned optics of expression.
Fig. 8 is the stereographic map of another variation of the above-mentioned optics of expression.
Fig. 9 is the figure of expression from the optical image of optic modulating device ejaculation.
Figure 10 is the figure of expression through the state of the light of existing optics.
Figure 11 is the figure of expression by the picture of above-mentioned existing optics projection.
Embodiment
Below, based on accompanying drawing embodiments of the present invention are described.
(the 1. structure of projector)
Figure 1 illustrates the optical system of the projector of present embodiment.
As shown in Figure 1, this projector 4 has: integrated lighting optical system 41, color separation optical system 42, relay optical system 43, optic modulating device (liquid crystal board) and color synthesizing optical device (cross two prisms (cross dichroic prism)) formed optical devices 44, optics 1 and the projection lens 45 of one.
In addition, the structure for optics 1 is elaborated in the back.
Integrated lighting optical system 41 is to be used for the optical system that the image forming area to the liquid crystal board described later that constitutes optical devices 44 roughly throws light on equably.This integrated lighting optical system 41 has: light supply apparatus 411, first lens arra the 412, the 2nd lens arra 413, polarization conversion device 414 and overlapping lens 415.
The 1st lens arra 412 has following structure: it is rectangular to see that from optical axis direction the lenslet with essentially rectangular profile is arranged in.Each lenslet will be divided into a plurality of segment beams from the light beam that light supply apparatus 411 penetrates.
The 2nd lens arra 413 has the structure roughly the same with the 1st lens arra 412, and it is rectangular that its structure is that lenslet is arranged in.The 2nd lens arra 413 has following function: be imaged onto on the liquid crystal board described later of optical devices 44 with the picture of overlapping lens 415 with each lenslet of the 1st lens arra 412.
Color separation optical system 42 has 2 dichroscopes 421,422 and catoptron 423, has following function:, will be separated into the color of light of three kinds of colors of red, green, blue from a plurality of segment beams that integrated lighting optical system 41 penetrates by dichroscope 421,422.
Relay optical system 43 has: light incident side lens 431, relay lens 433 and catoptron 432,434 have following function: will separate the red light liquid crystal board described later that the red light that obtains guides to optical devices 44 by color separation optical system 42.
At this moment, in the dichroscope 421 of color separation optical system 42, the blue light composition of the light beam that penetrates from integrated lighting optical system 41 is reflected, and simultaneously, red light composition and green light composition see through.The blue light that is reflected by dichroscope 421 mirror 423 reflections that are reflected arrive the aftermentioned blue light liquid crystal board of optical devices 44 by field lens 418.This field lens 418 will convert to respect to the parallel light beam of its central shaft (chief ray) from the various piece light that the 2nd lens arra 413 penetrates.The field lens 418 of the light incident side of the liquid crystal board that the green light that is arranged on other is used with, red light also is the same.
The red light and the green light in the green light that see through dichroscope 421 are reflected by dichroscope 422, arrive the green light liquid crystal board described later of optical devices 44 by field lens 418.On the other hand, red light sees through dichroscope 422 and by relay optical system 43, arrives the red light liquid crystal board described later of optical devices 44 again by field lens 418.
Each liquid crystal board 441 is based on the not shown image information from the outside, and the color of light of institute's incident is modulated, and penetrates the permeation type liquid crystal plate of modulated beam of light from a side opposite with light incident side.
As shown in Figure 2, liquid crystal board 441 has sealed twisted-nematic (TN) liquid crystal 53 between 2 transparency carriers (subtend substrate 51, TFT substrate 52) that are made of glass etc.
Subtend substrate 51 is provided with public electrode 54 and blocks black matrix 55 that unwanted light uses etc.
The opposing party's TFT substrate 52 is provided with and is configured to rectangular a plurality of pixel electrodes 56 and as thin film transistor (TFT) (TFT) 57 of on-off element etc.When pixel electrode 56 applies voltage, drive the liquid crystal 53 be clipped between the public electrode 54 set on itself and the subtend substrate 51 by TFT 57.In addition, on TFT substrate 52, with a plurality of sweep traces 58 of rectangular cross-over configuration and a plurality of data line 59, near its cross part TFT 57 is configured to: grid is connected with sweep trace 58, source electrode is connected with data line 59, drain electrode is connected with pixel electrode 56.
And, sweep trace 58 is applied when selecting voltage successively, by with the X-direction of its conducting accordingly on TFT 57, write driving voltage to pixel electrode 56.TFT 57 ends by applying non-selection voltage, and the driving voltage that is applied is remained in not shown memory capacitance etc.That is, the type of drive of liquid crystal board 441 is the mode of active matrix.Here, black matrix 55 forms a plurality of openings on the part corresponding with the pixel electrode 56 of TFT substrate 52, and this opening becomes transmittance section 551.Transmittance section 551 is essentially rectangular shape (in the present embodiment for roughly square shape) in planimetric map, is configured to rectangular.Part outside the transmittance section 551 becomes the light shielding part 552 that disposes according to the mode that covers the part except the pixel electrode 56 of this TFT substrate 52.This light shielding part 552 is by a plurality of limit 552A of approximate vertical, the clathrate that 552B constitutes.
Light incident side polaroid 442 only makes and separates polarized light on the certain orientation in each color of light that obtains by color separation optical system 42 and see through and absorb other light beam, for example pastes polarizing coating on the substrate of sapphire glass etc. and forms.
Emitting side polaroid 443 also has the structure roughly the same with light incident side polaroid 442, polarized light on the predetermined direction from the light beam that liquid crystal board 441 (441R, 441G, 441B) penetrates is seen through and absorbs other light beam.
These light incident side polaroids 442 and emitting side polaroid 443 are set at polarization axis direction and are perpendicular to one another.
The optical image that cross two prisms 444 will penetrate, form at every kind of color of light modulation from emitting side polaroid 443 synthesizes, and forms coloured image thus.
On cross two prisms 444, be provided with the dielectric multilayer film of reflection red light and the dielectric multilayer film of reflect blue light according to X word shape roughly, utilize these dielectric multilayer films that 3 kinds of color of light are synthetic along the interface of 4 right-angle prisms.
(the 2. structure of optics)
With reference to Fig. 3～Fig. 6, optics 1 is described.
Fig. 3 and optics 1 shown in Figure 4 are used for not making the shade of light shielding part 552 of the black matrix 55 of liquid crystal board 441 to project to projected image, and it is configured on the light beam emitting side of liquid crystal board 441.In the present embodiment, be configured between light beam emitting side, cross two prisms 444 and the projection lens 45 as liquid crystal board 441.
This optics 1 has: first phase retardation film 11 (first optical element), first birefringent plate 12, second phase retardation film 13 (second optical element) and second birefringent plate 14, and begin according to this arranged in order from the light beam light incident side.These each parts 11～14 are the essentially rectangular shape in the plane, and the flat shape of each parts 11～14 and size are about equally.
The linearly polarized light that first phase retardation film 11 is used for inciding optics 1 converts circularly polarized light to, brings into play the effect of 1/4 wavelength plate.As this first phase retardation film 11, preferred use that to have a phase differential elongated and become the plastic foil of big wavelength dispersion characteristic along with the light wavelength of institute's incident.As plastic foil with such function, can example illustrate uniaxial extension, glass transition temperature is more than or equal to the film of 200 ℃ polycarbonate system.
Fig. 5 is the curve map of the birefringent wavelength dispersion characteristic of the above-mentioned plastic foil of expression.The transverse axis of curve map is represented incident light wavelength (nm), and the longitudinal axis represents to penetrate light wavelength (nm).The straight line C of solid line represents the wavelength with respect to 1/4 phase differential of lambda1-wavelength, and ordinary light is given in its expression, extraordinary ray 1/4 phase differential is poor with the desired phase that linearly polarized light converts circularly polarized light to.Curve B shown in curve A shown in the dot-and-dash line, the dotted line is represented the birefringent wavelength dispersion characteristic of dissimilar above-mentioned plastic foils respectively.Has phase differential respectively along with (light wavelength of incident is elongated and become big wavelength dispersion characteristic in 400～800nm) at visible-range.The plastic foil with birefringent wavelength dispersion characteristic shown in this curve A or the curve B can be used for first phase retardation film 11.
First birefringent plate 12 is configured in the light beam emitting side of first phase retardation film 11, will be separated into ordinary light and extraordinary ray from the light that first phase retardation film 11 penetrates.This first birefringent plate 12 has a orientation along the transmittance section 551 of the black matrix 55 of liquid crystal board 441, in other words along the optical axis of the direction (arrow 121 directions of Fig. 4) of one side 552A of the clathrate light shielding part 552 of black matrix 55.In the present embodiment, first birefringent plate 12 have in the plane of incidence, at the upwardly extending optical axis in side that becomes 90 ° with respect to Y-axis.
As the first such birefringent plate 12, preferred for example quartz, the lithium niobate (LiNbO of using
3) wafer.Wherein, as first birefringent plate 12, preferably use lithium niobate.By using the wafer of lithium niobate, compare with the situation of using quartzy wafer, can make the thickness attenuation of birefringent plate.That is,, under the identical situation of the separation width of light, used a side the thickness of birefringent plate of lithium niobate thinner for having used quartzy birefringent plate and having used for the birefringent plate of lithium niobate.
In addition, also can in first birefringent plate 12 and second birefringent plate 14 described later, use quartz and lithium niobate, in addition, can also use the wafer except quartz, lithium niobate with the form of certain combination.For example, can also use: sodium nitrate (Chile saltpeter), kalzit, rutile (rutile), KPD (KH
2PO
4), APD (NH
4H
2PO
4) etc.
Second phase retardation film 13 is configured in the light beam emitting side of first birefringent plate 12, has and first phase retardation film, 11 identical functions (linearly polarized light of institute's incident being converted to the function of circularly polarized light).In addition, second phase retardation film 13 is identical with first phase retardation film 11, constitutes by having phase differential and plastic foil that become big wavelength dispersion characteristic elongated along with the light wavelength of institute's incident.As the material of this plastic foil, can use and first phase retardation film, 11 identical materials.
Second birefringent plate 14 is configured in the light beam emitting side of second phase retardation film 13, will be separated into ordinary light and extraordinary ray from the light that second phase retardation film 13 penetrates.The optical axis of this second birefringent plate 14 is configured to the optical axis approximate vertical with first birefringent plate 12, along the direction (arrow 141 directions of Fig. 4) of the another side 552B vertical with above-mentioned one side 552A that constitutes the clathrate light shielding part 552 of deceiving matrix 55.In the present embodiment, the optical axis of second birefringent plate 14 becomes on 0 ° the direction to extend with respect to Y-axis in the plane of incidence.As this second birefringent plate 14, can use the wafer identical with first birefringent plate 12.
Such optics 1 constitutes to have: first phase retardation film 11, first birefringent plate 12, second phase retardation film 13 and second birefringent plate 14, but in addition also wish to have antireflection film.For example, can on the face of the light beam emitting side of the face of the light beam light incident side of first phase retardation film 11 and second birefringent plate 14, form antireflection film (omitting diagram).By forming antireflection film, can further suppress to incide the surface reflection of the light beam of the display optical picture on the optics 1.
The reflection of the light beam in the optics 1 is owing to above-mentioned surface reflection or constitutes reflection on the interface of each key element of optics 1 etc. and produce.The reflected light that is produced incides on the optical devices 44 (each liquid crystal board 441, cross two prisms 444 etc.), and quilt is secondary reflection again, thereby produces ghost image etc. in the image of institute's projection.Reflectivity in optics 1 (surface reflectivity and constitute reflectivity on the interface of each key element of optics 1) surpasses under 5% the situation ghost image as can be seen.
In addition, first phase retardation film 11 of optics 1 and first birefringent plate, 12 usefulness acrylic acid class bonding agent S bond together.In addition, first birefringent plate 12 and second phase retardation film 13, second phase retardation film 13 and second birefringent plate 14 also bond together with acrylic acid class bonding agent S.
Acrylic acid class bonding agent S has used refractive index more than or equal to 1.48 material.More preferably, use refractive index more than or equal to 1.54 material.
In addition, can carry out the adjusting of the refractive index of acrylic acid class bonding agent S by in bonding agent S, adding aromatic monomer.Can list as aromatic monomer: acrylic acid 6-(4,6-two bromo-2-isopropyl phenoxy groups)-the own ester of 1-, acrylic acid 6-(4,6-two bromo-2-sec-butyl phenoxy groups)-the own ester of 1-, acrylic acid 2,6-two bromo-4-nonyl phenyl esters, acrylic acid 2,6-two bromo-4-dodecyl phenyl esters, acrylic acid 2-(1-naphthoxy)-1-ethyl ester, acrylic acid 2-(2-naphthoxy)-1-ethyl ester, acrylic acid 6-(1-the naphthoxy)-own ester of 1-, acrylic acid 6-(2-the naphthoxy)-own ester of 1-, acrylic acid 8-(1-naphthoxy)-1-monooctyl ester, acrylic acid 8-(2-naphthoxy)-1-monooctyl ester, and the acrylic acid phenoxy ethyl etc.
Using refractive index is that the reflectivity of optics 1 is as follows under the situation of 1.48 the bonding agent antireflection film that is used as having formed on such acrylic acid class bonding agent S and the face at the light beam emitting side of the face of the light beam light incident side of first phase retardation film 11 and second birefringent plate 14 0.6% general reflection.
Surface reflectivity when having formed the antireflection film of 0.6% reflection on the face of the light beam light incident side of first phase retardation film 11 (polycarbonate, refractive index: roughly 1.60) is roughly 0.6%, on the face of the light beam emitting side of second birefringent plate 14 (quartzy, refractive index: roughly 1.54), formed 0.6% reflect antireflection film the time surface reflectivity be roughly 0.6%.In addition, though omitted detailed description, the reflectivity that constitutes on the interface of each key element of optics 1 adds up to 3.65%.
That is, the reflectivity in the optics 1 is for roughly 4.85 (that is, 0.6+3.65+0.6) % does not surpass 5%, so can prevent the generation of ghost image.
In addition, it is more little and become more little along with the difference of the refractive index value of each key element to constitute reflectivity on the interface of each key element of optics 1.Therefore, the refractive index of acrylic adhesives S is preferably more than and equals 1.48, more preferably more than or equal to the refractive index 1.54 of each birefringent plate 12,14 that is made of quartz., do not wish to surpass the refractive index 1.60 of each phase retardation film 11,13 that constitutes by polycarbonate.If refractive index surpasses 1.60, the reflectivity on the interface is uprised.
In optics 1 as above, the light of institute's incident is separated in the following manner, the shade of black matrix 55 that prevents liquid crystal board 441 is to the influence of projected image.Here, mainly describe with reference to Fig. 4.In addition, in Fig. 4, show the figure of the released state of the exploded perspective view of optics 1 and the light that optics 1 is passed through in expression.
From liquid crystal board 441 through crosses two prisms 444 penetrate only at the linearly polarized light L1 that vibrates along the direction of one side 552A of the clathrate light shielding part 552 of black matrix 55 or the another side 552B (the arrow Y direction of Fig. 4) vertical with this one side 552A.This linearly polarized light L1 incides in first phase retardation film 11, converts circularly polarized light L2 to.
The light L2 that penetrates from first phase retardation film 11 incides on first birefringent plate 12.And, be separated into ordinary light L3 and extraordinary ray L4 by this first birefringent plate 12.Extraordinary ray L4 is to the optical axis direction of first birefringent plate 12, promptly along the deviation in driction of one side 552A of the clathrate light shielding part 552 of black matrix 55.In addition, between this ordinary light L3 and the extraordinary ray L4 depart from width (separation width) be preferably more than equal pel spacing T (with reference to Fig. 2) 1/3 and smaller or equal to 2/3.
The ordinary light L3, the extraordinary ray L4 that penetrate from first birefringent plate 12 convert circularly polarized light L5, L6 to from linearly polarized light respectively by second phase retardation film 13.Afterwards, from 2 light L5 that second phase retardation film 13 penetrates, L6 incides on second birefringent plate 14.In second birefringent plate 14,2 light L5 of institute's incident, L6 are separated into ordinary light L7 and extraordinary ray L9, ordinary light L8 and extraordinary ray L10 respectively.Extraordinary ray L9, L10 is to the optical axis direction of second birefringent plate 14, promptly along the deviation in driction of the another side 552B of the clathrate light shielding part 552 that constitutes black matrix 55.Thus, be separated into 4 light L7, L8, L9, L10 are configured in roughly on square or the roughly rectangular summit, described roughly square or roughly rectangle have along the limit 552A of the clathrate light shielding part 552 that constitutes black matrix 55, the limit of 552B.Therefore, in passing through the image G of projection lens 45 projections, for example, as shown in Figure 6, irradiate light by among the image G of optics 1 projection, is deceived the picture P disappearance of the light shielding part 552 of matrix 55 on the part of the shade that is formed by the light shielding part 552 of deceiving matrix 55.
In addition, between ordinary light L7, the L8 of second birefringent plate 14 and extraordinary ray L9, the L10 depart from width (separation width) also be preferably more than equal pel spacing T (with reference to Fig. 2) 1/3 and smaller or equal to 2/3.
(the 3. effect of embodiment)
Therefore, according to present embodiment, can access following effect.
(3-1) will be converted to circularly polarized light L2 from the linearly polarized light L1 that cross two prisms 444 penetrate by first phase retardation film 11.By becoming circularly polarized light, can utilize first birefringent plate 12 that has along the optical axis of the direction of one side 552A of the clathrate light shielding part 552 that constitutes black matrix 55, will be separated into ordinary light L3, extraordinary ray L4 from the light of cross two prisms 444.The detaching direction of ordinary light L3, the extraordinary ray L4 of this moment is the direction along one side 552A of the clathrate light shielding part 552 that constitutes black matrix 55.And, convert 2 light L3, L4 that separated to circularly polarized light L5, L6 by second phase retardation film 13 afterwards, separate this circularly polarized light L5, L6 by having with second birefringent plate 14 of the optical axis of the optical axis approximate vertical of first birefringent plate 12.Thus, two circularly polarized light L5, L6 be separated to the direction vertical with detaching direction in first birefringent plate 12, promptly on the direction of clathrate the light shielding part 552 and another side 552B above-mentioned one side 552A approximate vertical that constitutes black matrix 55.
In such present embodiment, because by optics 1, to deceive 2 vertical limit 552A of the clathrate light shielding part 552 of matrix 55 along formation through the light L1 that the transmittance section 551 of black matrix 55 is penetrated, 552B is separated into 4 light L7, L8, L9, L10, so light L7, L8 after this separation, L9, L10 are configured to roughly on square or the roughly rectangular summit, described roughly square or roughly rectangle have along the limit of vertical 2 limit 552A, the 552B of the light shielding part 552 of black matrix 55.Thus, overlapping as shown in Figure 6 through the image G of projection lens 45 projections, can improve from the aesthetics of the image of projector 4 projections.
(3-2) in the present embodiment,, used phase retardation film 11,13, compared, can realize the slimming and the lightweight of optics 1 with the situation of using wafers such as quartz as the element that linearly polarized light is converted to circularly polarized light.
In addition, phase retardation film the 11, the 13rd, plastic film as the element that linearly polarized light is converted to circularly polarized light, is compared with the situation of using wafers such as quartz, can realize the reduction of cost.
(3-3), can propose outside two birefringent plates 101,102, increase the method that the 3rd birefringent plate is set for the optics 100 (with reference to Figure 10) that uses existing structure carries out square discrete.Yet, in this case, owing to used 3 birefringent plates, so the thickness thickening of optics and weight increase.
With respect to this, the optics 1 of present embodiment constitutes has 12,14 and 2 phase retardation films 11,13 of 2 birefringent plates, therefore compares with the situation of using 3 birefringent plates, can make the thickness attenuation of optics 1 and can realize lightweight.
(3-4) in the present embodiment, phase differential is elongated along with institute's lambda1-wavelength and material that become big wavelength dispersion characteristic constitutes first phase retardation film 11 and second phase retardation film 13 by having, so can convert incident light to circularly polarized light from linearly polarized light in very wide wavelength coverage.
(3-5) and, in the present embodiment, phase retardation film 11,13 and birefringent plate the 12, the 14th bond together by acrylic adhesives S, so can absorb the linear expansion coefficient difference that is accompanied by phase retardation film 11,13 and birefringent plate 12,14 and the distortion that produces with bonding agent S.Thus, can access the high optics of permanance 1.
In addition, use acrylic adhesives S to realize bonding between phase retardation film 11,13 and the birefringent plate 12,14, can prevent reduction thus through the transmitance of the light of optics 1.
(3-6) in addition, in the present embodiment, phase retardation film 11,13 and the birefringent plate 12,14 that constitutes optics bonded together more than or equal to 1.48 acrylic adhesives S by refractive index, can suppress to incide the reflection of light beam on the interface of each phase retardation film 11,13 and each birefringent plate 12,14 of the display optical picture in the optics 1, prevent that reflected light from inciding in the optical devices 44, reflection again produces ghost image etc. in the image of institute's projection.
(3-7) in addition, since the separation width of first birefringent plate 12 of optics 1 and second birefringent plate 14 be more than or equal to the pel spacing of liquid crystal board 441 1/3 and smaller or equal to 2/3, can eliminate reliably thus in the projected image owing to deceiving the shade that matrix 55 forms.
In addition, the invention is not restricted to above-mentioned embodiment, the distortion in the scope that can realize the object of the invention, improvement etc. comprise in the present invention.
In the above-described embodiment, in optics 1, the flat shape of first phase retardation film 11, first birefringent plate 12, second phase retardation film 13, second birefringent plate 14 is identical, and the equal and opposite in direction on plane, but be not limited thereto, for example, optics 2 that also can be as shown in Figure 7 is such, make the size of second birefringent plate 24 that is positioned at the light beam emitting side bigger, to carry out differentiation easily to the light beam light incident side and the light beam emitting side of optics than first phase retardation film 11, first birefringent plate 12 and second phase retardation film 13.
In addition, for the light beam light incident side that carries out optics easily and the differentiation of light beam emitting side, also can be formed among 4 bights of optics 3 as shown in Figure 8, cut the structure in a bight.Be configured to make this to cut part 31 optics 3, form the structure of first phase retardation film 11 thus, thereby can carry out the differentiation of the light beam light incident side and the light beam emitting side of optics easily towards the light beam light incident side for example on the upper left side.
Like this, owing to carry out the light beam light incident side of optics, the differentiation of light beam emitting side easily, so in the housing that optics is arranged at optical device such as projector the time, can be provided with easily.
In addition, in the above-described embodiment, it is elongated and become big wavelength dispersion characteristic along with the light wavelength of institute's incident to make phase retardation film 11,13 have a phase differential, but also can use the phase retardation film with such characteristic.
And, in the above-described embodiment, in optics, used plastic phase retardation film 11,13 as the optical element that linearly polarized light is converted to circularly polarized light, but be not limited thereto, for example can also use piezoid etc. as the optical element that linearly polarized light is converted to circularly polarized light.In addition, in the above-described embodiment, in optics 1, first phase retardation film 11,13 and birefringent plate 12,14 are bonded together, but the type of employed bonding agent S is not limited thereto by acrylic adhesives S.For example, can also use silicon class bonding agent.And, can also be when phase retardation film 11,13 and birefringent plate 12,14 be bonded together, do not use bonding agent and use cement.
In addition, in the above-described embodiment, optics 1 is carried the projector 4 of the preceding throwing type (front type) that carries out projection from the direction of view screen, but be not limited thereto, also can carry from carrying out in the opposite direction on the projector of rear projection type (rear type) of projection with the side of view screen.
And the optical device that carries optics 1 is not limited to projector.
In addition, in projector 4, used 3 liquid crystal boards 441, but be not limited thereto.For example can also be for only using 1 liquid crystal board, use 2 liquid crystal boards or using the structure of 4 or above liquid crystal board 441.
In the above-described embodiment, liquid crystal board 441 is assumed to be the driven with active matrix mode and illustrates, but is not limited thereto, and can also adopt the liquid crystal board of passive matrix type of drive.At this moment, as long as pixel electrode, public electrode meet the shape of type of drive.And, as on-off element, be not limited to 3 terminal components of TFT element illustrated in above-mentioned each form of implementation, can also adopt 2 terminal components of MIM etc. etc.
The present invention can be used in the optics of lift-launch in optical devices such as projector.
Claims (6)
1. an optics is configured in the light beam emitting side that has relative a pair of substrate and be enclosed in the optic modulating device of the liquid crystal between these substrates, it is characterized in that,
Above-mentioned optic modulating device has on a substrate among the above-mentioned relative a pair of substrate pixel electrode according to rectangular configuration; And be configured in black matrix on another aforesaid substrate, this black matrix is formed with the transmittance section corresponding with pixel electrodes, and has the part of covering except pixel electrodes, has the cancellate light shielding part on the limit of approximate vertical,
Above-mentioned optics begins to have successively from a side of the light beam emitting side that is configured to above-mentioned optic modulating device:
To convert first optical element of circularly polarized light from the linearly polarized light that above-mentioned optic modulating device penetrates to;
First birefringent plate, it has along the optical axis on one side of the cancellate light shielding part of the black matrix that constitutes above-mentioned optic modulating device;
To convert second optical element of circularly polarized light from ordinary light, the extraordinary ray of first birefringent plate to; And
Incident is from the light beam of above-mentioned second optical element, and has second birefringent plate with the optical axis of the optical axis approximate vertical of above-mentioned first birefringent plate,
Described first birefringent plate and described second birefringent plate separate width more than or equal to pel spacing 1/3 and smaller or equal to 2/3 of pel spacing.
2. optics as claimed in claim 1 is characterized in that,
Above-mentioned first optical element and second optical element are plastic phase retardation films.
3. optics as claimed in claim 2 is characterized in that,
It is elongated and become big wavelength dispersion characteristic along with the light wavelength of institute's incident that above-mentioned phase retardation film has phase differential.
4. as claim 2 or 3 described opticses, it is characterized in that,
Above-mentioned phase retardation film and above-mentioned birefringent plate bond together by acrylic adhesives mutually.
5. optics as claimed in claim 4 is characterized in that,
The refractive index of aforesaid propylene acids bonding agent is more than or equal to 1.48 and smaller or equal to the refractive index of above-mentioned phase retardation film.
6. projector has:
A plurality of optic modulating devices, it has the pixel electrode according to rectangular configuration, and black matrix, should be formed with the transmittance section corresponding by black matrix with this pixel electrode, and have the part of covering except pixel electrodes, have the cancellate light shielding part on the limit of approximate vertical, this optic modulating device, is modulated the light beam that penetrates from light supply apparatus at every kind of color of light according to image information;
Color synthesizing optical device, its light beam that each optical modulation device is modulated synthesizes; And
Projecting optical device, it forms projected image to carrying out enlarging projection by the synthetic color of light of this color synthesizing optical device,
It is characterized in that,
Between above-mentioned optic modulating device and above-mentioned projecting optical device, be provided with as any described optics in the claim 1 to 5.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005076858 | 2005-03-17 | ||
| JP2005076858 | 2005-03-17 | ||
| JP2005268119 | 2005-09-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1834727A CN1834727A (en) | 2006-09-20 |
| CN100374904C true CN100374904C (en) | 2008-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100570602A Expired - Fee Related CN100374904C (en) | 2005-03-17 | 2006-03-17 | Optical part and projector |
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| Country | Link |
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| CN (1) | CN100374904C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103324008A (en) * | 2012-03-19 | 2013-09-25 | 精工爱普生株式会社 | Projector |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020184037A (en) * | 2019-05-09 | 2020-11-12 | 株式会社日本製鋼所 | Wavelength plate, manufacturing method of wavelength plate, and optical device |
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|---|---|---|---|---|
| CN1256437A (en) * | 1998-12-09 | 2000-06-14 | 诺日士钢机株式会社 | Projection printing apparatus |
| US6081346A (en) * | 1996-09-06 | 2000-06-27 | Fuji Photo Film Co., Ltd. | Digital image forming apparatus |
| CN1448754A (en) * | 2002-03-28 | 2003-10-15 | 精工爱普生株式会社 | Optical device and projector |
| CN1564951A (en) * | 2002-06-27 | 2005-01-12 | 帝人株式会社 | Polycarbonate-based oriented film and retardation film |
| WO2005008332A1 (en) * | 2003-07-22 | 2005-01-27 | Seiko Epson Corporation | Projector |
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2006
- 2006-03-17 CN CNB2006100570602A patent/CN100374904C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081346A (en) * | 1996-09-06 | 2000-06-27 | Fuji Photo Film Co., Ltd. | Digital image forming apparatus |
| CN1256437A (en) * | 1998-12-09 | 2000-06-14 | 诺日士钢机株式会社 | Projection printing apparatus |
| CN1448754A (en) * | 2002-03-28 | 2003-10-15 | 精工爱普生株式会社 | Optical device and projector |
| CN1564951A (en) * | 2002-06-27 | 2005-01-12 | 帝人株式会社 | Polycarbonate-based oriented film and retardation film |
| WO2005008332A1 (en) * | 2003-07-22 | 2005-01-27 | Seiko Epson Corporation | Projector |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103324008A (en) * | 2012-03-19 | 2013-09-25 | 精工爱普生株式会社 | Projector |
| CN103324008B (en) * | 2012-03-19 | 2015-04-29 | 精工爱普生株式会社 | Projector |
| US9097907B2 (en) | 2012-03-19 | 2015-08-04 | Seiko Epson Corporation | Projector having retardation films upstream and downstream of a polarization switching liquid crystal panel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1834727A (en) | 2006-09-20 |
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