CN101452152B - Liquid crystal display device and projector - Google Patents
Liquid crystal display device and projector Download PDFInfo
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- CN101452152B CN101452152B CN2008101764002A CN200810176400A CN101452152B CN 101452152 B CN101452152 B CN 101452152B CN 2008101764002 A CN2008101764002 A CN 2008101764002A CN 200810176400 A CN200810176400 A CN 200810176400A CN 101452152 B CN101452152 B CN 101452152B
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Abstract
The invention provides a liquid crystal display device includes: a liquid crystal panel which has a liquid crystal device containing liquid crystal operating in twist nematic mode and a micro-lens array disposed adjacent to the liquid crystal device; a first optical compensating plate disposed on the incident side of the liquid crystal panel to optically compensate the liquid crystal device; and a second optical compensating plate disposed on the exit side of the liquid crystal panel to optically compensate the liquid crystal device. A first retardation of the first optical compensating plate in system optical axis direction is larger than a second retardation of the second optical compensating plate in the system optical axis direction.
Description
Technical field
The present invention relates to image and form the liquid crystal indicator of usefulness and the projector that is assembled with this liquid crystal indicator.
Background technology
As liquid crystal projector in the past, such projector is arranged: the liquid crystal panel that uses twisted nematic, and at liquid crystal panel with penetrate and to dispose the 2 block compensations optical element that is made of sapphire plate etc. between the polarization plates, this sapphire plate has with respect to light emergence face at the tilt optic axis (with reference to patent documentation 1) of predetermined angular of the grinding direction of alignment films.In such liquid crystal projector,, can compensate the pre-dumping of liquid crystal, thereby can improve contrast by adjusting the compensation of the disposing optic axis of optical element, thickness etc. near liquid crystal panel.
In addition, also exist multiplely illumination light to be gathered on the pixel, improve the technology (for example with reference to patent documentation 2 etc.) of display characteristic by assembling micro-lens array in liquid crystal panel.
[patent documentation 1] spy opens the 2004-198650 communique
[patent documentation 2] spy opens the 2003-287603 communique
; in the such liquid crystal panel of above-mentioned patent documentation 1; though will compensate with the optics arrangements of components at the light emitting side; but fasten the pass in the space of emitting side, the back focus of projecting lens etc.; exist restricted situation in configuration; compensation not only need be configured in the light emitting side with optical element, but also be configured in light incident side.At this, as long as liquid crystal panel is not that to be assembled with the panel of micro-lens array just no problem, but, be assembled with at liquid crystal panel under the situation of micro-lens array, under the influence of micro-lens array, the degree of tilt of the light beam of emitting side all can change, thereby can not carry out meticulous compensation.
Summary of the invention
Thereby, even the object of the present invention is to provide a kind of at the liquid crystal device that is assembled with micro-lens array light incident side and the both sides of emitting side dispose compensation with under the situation of optical element, also can realize the liquid crystal indicator of meticulousr compensation.
In addition, the object of the present invention is to provide a kind of projector that is assembled with liquid crystal indicator as described above.
In order to address the above problem, liquid crystal indicator of the present invention possesses: (a) liquid crystal panel, its have comprise with the liquid crystal device of the liquid crystal of twisted nematic mode work and with the micro-lens array of above-mentioned liquid crystal device disposed adjacent; (b), above-mentioned liquid crystal device is configured in the 1st optical compensation plate of the light incident side of above-mentioned liquid crystal panel for being carried out the compensation of optics; And the 2nd optical compensation plate that (c) is configured in the emitting side of above-mentioned liquid crystal panel for above-mentioned liquid crystal device is carried out the compensation of optics; (d) wherein, bigger about the 1st phase differential of above-mentioned the 1st optical compensation plate of systematic optical axis direction than the 2nd phase differential about above-mentioned the 2nd optical compensation plate of said system optical axis direction.
In above-mentioned liquid crystal indicator, disperse such geometrical optics variation even incide the light beam generation of liquid crystal panel more because of the effect that is subjected to micro-lens array, also because the 1st phase differential of the 1st optical compensation plate is big than the 2nd phase differential of the 2nd optical compensation plate, so can keep the function of the 1st and the 2nd optical compensation plate or the balance of effect in the mode of the influence of eliminating this geometrical optics variation.Promptly, even in the pre-dumping with the compensation liquid crystal device is that purpose disposes under the situation of the 1st and the 2nd optical compensation plate at the light incident side of liquid crystal panel and the both sides of emitting side, also can make the compensation of two optical compensation plates good, can make characteristics such as contrast of LCD degree better.
In addition, if adopt concrete mode of the present invention or viewpoint, then in above-mentioned liquid crystal indicator, the 1st and the 2nd optical compensation plate all is the flat parts that form with dead matter; The 1st phase differential and the 2nd phase differential, respectively according to the systematic optical axis direction be benchmark the 1st optical compensation plate optic axis polar angle, refractive index and thickness and be that optic axis polar angle, refractive index and the thickness of the 2nd optical compensation plate of benchmark is determined with the systematic optical axis direction.In the case, by adjusting optic axis polar angle, refractive index and the thickness of the 1st and the 2nd optical compensation plate, can the compensation of the pre-dumping of liquid crystal device suitably be changed.
If adopt another way of the present invention, then the optic axis of the 1st optical compensation plate has the optic axis that tilts in the direction parallel with the grinding direction of alignment films, this alignment films is arranged at the light incident side of liquid crystal device or the side's side in the emitting side, the optic axis of the 2nd optical compensation plate has the optic axis that tilts in the direction parallel with the grinding direction of alignment films, and this alignment films is arranged at the light incident side of liquid crystal device or the opposing party's side in the emitting side.In the case, the 1st optical compensation plate and the 2nd optical compensation plate can be effectively applied to respectively to be arranged near the liquid crystal the alignment films of light incident side of liquid crystal device pre-dumping compensation and be arranged near the compensation of the pre-dumping of the liquid crystal another alignment films of emitting side.
If adopt another mode of the present invention, the ratio of the 1st phase differential of relative the 1st optical compensation plate of the 2nd phase differential of the 2nd optical compensation plate then, with the ratio of the effective F value of the light incident side of the relative liquid crystal panel of effective F value of the emitting side of liquid crystal panel about equally.At this, the effective F value of the light incident side of so-called liquid crystal panel, if pay close attention to a pixel of liquid crystal panel, suppose in the illuminating bundle of incident with light beam corresponding opening angle with respect to the systematic optical axis maximum inclination be α 1[°], then represent (tan (90 °-α 1/2))/2.Equally, the F value of the emitting side of so-called liquid crystal panel, if pay close attention to a pixel of liquid crystal panel, suppose in the modulated beam of light that penetrates with light beam corresponding opening angle with respect to the systematic optical axis maximum inclination be α 2[°], then represent (tan (90 °-α 2/2))/2.In the case, can roughly correctly make the compensation balance of the pre-dumping of the 1st optical compensation plate and the 2nd optical compensation plate quantitatively.
And the ratio of the 1st phase differential of relative the 1st optical compensation plate of the 2nd phase differential of the 2nd optical compensation plate can pass through simulation, trial-production etc. particularly, adjusts or revises in the mode of improving contrast-response characteristic etc.
Projector of the present invention possesses: (a) liquid crystal indicator used of above-mentioned optical modulation; (b) lighting device that liquid crystal indicator is thrown light on; (c) projecting lens of the image that forms by liquid crystal indicator of projection.
In above-mentioned projector, a kind of above-mentioned liquid crystal indicator that possesses can be provided, and can utilize the projector of the good liquid crystal indicator projection high quality images of characteristics such as contrast.
The 2nd liquid crystal indicator of the present invention possesses: (a) liquid crystal panel, and it has the liquid crystal device that comprises liquid crystal and at the micro-lens array of the light incident side of liquid crystal device; (b) be configured in the 1st optical compensation plate of the light incident side of micro-lens array; And the 2nd optical compensation plate that (c) is configured in the emitting side of liquid crystal panel; (d) wherein, bigger about the 1st phase differential of the 1st optical compensation plate of systematic optical axis direction than the 2nd phase differential about the 2nd optical compensation plate of systematic optical axis direction.In this liquid crystal indicator, because the 1st phase differential of the 1st optical compensation plate is bigger than the 2nd phase differential of the 2nd optical compensation plate, even be subjected to dispersing such geometrical optics variation so incide the light beam of liquid crystal panel, the 1st and the 2nd optical compensation plate is worked aptly because of micro-lens array.Thus, can make the compensation of two optical compensation plates good, can make the characteristic of liquid crystal indicator better.
Above-mentioned the 2nd liquid crystal indicator further has: the 1st polarization plates that is configured in the light incident side of liquid crystal panel in its mode of specializing; And the 2nd polarization plates that is configured in the emitting side of liquid crystal panel; Wherein, the 1st optical compensation plate is configured between the 1st polarization plates and the liquid crystal panel; The 2nd optical compensation plate is configured between liquid crystal panel and the 2nd polarization plates.
The 2nd projector of the present invention possesses: (a) the 2nd liquid crystal indicator used of above-mentioned optical modulation; (b) lighting device that liquid crystal indicator is thrown light on; (c) projecting lens of the image that forms by liquid crystal indicator of projection.This projector possesses the 2nd above-mentioned liquid crystal indicator, can utilize the liquid crystal indicator projection high quality images of good characteristic.
Description of drawings
Fig. 1 is the figure about the structure of projector's explanation optical system of embodiment;
Fig. 2 is the amplification profile of liquid crystal light valve of the projector of explanation pie graph 1;
Fig. 3 is that explanation is to the incident light of liquid crystal panel and the stretch-out view that penetrates the state of light;
Fig. 4 (A)～(D) is the figure of the compensation of the pre-dumping that realizes of explanation the 1st and the 2nd compensating element;
Fig. 5 is the figure of effect that the compensation of the 1st and the 2nd compensating element, is described conceptually; And
Fig. 6 is with the figure of F value ratio with the relation curveization of the input and output ratio of phase differential integrated value.
Symbol description
10: projector, 21: light supply apparatus, 21a: illuminator, 21d, 21e: lens arra, 21g: polarized light transform component, 21i: overlapping lens, 23: color separation optical system, 23a, 23b: dichronic mirror, 25: modulating sections, 25a, 25b, 25c: liquid crystal panel, 25e, 25f, 25g: polarized light filter, 27: cross dichroic prism, 29: projecting lens, 31: liquid crystal light valve, 31a: liquid crystal panel, 31b: the 1st polarized light filter, 31c: the 2nd polarized light filter, 71: liquid crystal layer, 72: the 1 substrates, 72a: micro-lens array, 73: the 2 substrates, 75: common electrode, 76,78: alignment films, 77: pixel electrode, 79: black matrix, 80: liquid crystal device, EL: key element lens, LI: incident light, LO: penetrate light, OC1: the 1st optical compensation plate, OC2: the 2nd optical compensation plate, PP: pixel portion, SA: systematic optical axis, d1, d2: thickness, θ 1, θ 2: the optic axis polar angle.
Embodiment
Fig. 1 is the concept map of structure of optical system of the projector that is assembled with liquid crystal indicator of explanation one embodiment of the present invention.
This projector 10 possesses: the light supply apparatus 21 that generates light source light; To be divided into the color separation optical system 23 of RGB 3 looks from the light source light of light supply apparatus 21; Modulating sections 25 by the illumination light illumination of penetrating from color separation optical system 23 of all kinds; Synthesize cross dichroic prism 27 from each colour light of modulating sections 25; As the projection projection 29 that optical projection arrives the projection optical system on the screen (not shown) that looks like that is used for to have passed through cross dichroic prism 27.Wherein, light supply apparatus 21, color separation optical system 23, modulating sections 25 and cross dichroic prism 27 become the image processing system that formation should project to the picture light on the screen.
In above projector 10, light supply apparatus 21 possesses: illuminator 21a; Concavees lens 21b; A pair of lens arra 21d, 21e; Polarized light transform component 21g; Overlapping lens 21i.Wherein, illuminator 21a for example is made of high-pressure mercury-vapor lamp, and it possesses the concave mirror that the recovery light source light forwards penetrates it.Concavees lens 21b has the effect from the light source light parallelization of illuminator 21a, but it also can omit.A pair of lens arra 21d, 21e form by being configured to rectangular a plurality of key element lens, utilize these key element lens to cut apart the light source light from illuminator 21a of having passed through concavees lens 21b, make its optically focused respectively, disperse.Polarized light transform component 21g will for example be transformed to only vertical with the paper of Fig. 1 s polarized light component and offer the next stage optical system from the light source light that lens arra 21e penetrates.Overlapping lens 21i can realize the overlapping illumination to the liquid crystal indicator of all kinds that is provided with by making the illumination light of having passed through polarized light transform component 21g as all suitable convergences in modulating sections 25.That is, passed through the illumination light of two lens arra 21d, 21e and overlapping lens 21i, equably liquid crystal panel 25a, 25b of all kinds, the 25c that is arranged in the modulating sections 25 carried out overlapping illumination via the color separation optical system 23 that describes in detail later.
Color separation optical system 23 possesses: the 1st and the 2nd dichronic mirror 23a, 23b; As 3 field lens 23f, the 23g, the 23h that revise optical system; Catoptron 23j, 23m, 23n, 23o, this color separation optical system 23 together constitutes lighting device with light supply apparatus 21.At this, the 1st dichronic mirror 23a, in RGB 3 looks, for example reflect red and green glow and blue light is seen through.In addition, the 2nd dichronic mirror 23b, in red and green 2 looks of institute's incident, reflect green light and ruddiness is seen through for example.In this color separation optical system 23, tortuous and incide the 1st dichronic mirror 23a from light source light light path on catoptron 23j of the roughly white of light supply apparatus 21.Passed through the blue light of the 1st dichronic mirror 23a,, incided the field lens 23f that is used to regulate incident angle via catoptron 23m for example with S polarized light former state.In addition, the green glow in reflection on the 1st dichronic mirror 23a and further reflection on the 2nd dichronic mirror 23b for example with s polarized light former state, incides field lens 23g.And then, passed through the ruddiness of the 2nd dichronic mirror 23b, for example with S polarized light former state,, incide field lens 23h via lens LL1, LL2 and catoptron 23n, 23o.Lens LL1, LL2 and field lens 23h constitute relay optical system.This relay optical system possess with the picture of the 1st lens LL1 via the 2nd lens LL2 roughly former state be delivered to the function of field lens 23h.
Modulating sections 25 possesses: 3 liquid crystal panel 25a, 25b, 25c; 3 groups of polarized light filter 25e, the 25f, the 25g that dispose in the mode that clips each liquid crystal panel 25a, 25b, 25c.At this, a pair of polarized light filter 25e, the 25e that be configured in liquid crystal panel 25a that the blue light on the 1st light path OP1 uses, clips it is configured for blue light being carried out on 2 dimensions according to image information the liquid crystal light valve of the blueness usefulness of intensification modulation.Equally, be configured in the liquid crystal panel 25b that the green glow on the 2nd light path OP2 uses, corresponding polarized light filter 25f, 25f and also constitute the liquid crystal light valve of green usefulness, be configured in the liquid crystal panel 25c that the ruddiness on the 3rd light path OP3 uses, the liquid crystal light valve that polarized light filter 25g, 25g also constitute red usefulness.
The blue light of branch incides the 1st liquid crystal panel 25a that blue light is used via field lens 23f by the 1st dichronic mirror 23a that sees through color separation optical system 23.The green glow of branch incides the 2nd liquid crystal panel 25b that green glow is used via field lens 23g by reflection on the 2nd dichronic mirror 23b of color separation optical system 23.The ruddiness of branch incides the 3rd liquid crystal panel 25c that ruddiness is used via field lens 23h by seeing through the 2nd dichronic mirror 23b.Each liquid crystal panel 25a～25c is that to be used for the pixel be the liquid crystal indicator of non-light emitting-type of spatial intensity distribution of illumination light of unit modulation incident, incide 3 coloured light of each liquid crystal panel 25a～25c respectively, be carried out modulation according to the drive signal or the picture signal that are input to each liquid crystal panel 25a～25c as electric signal.At this moment, utilize polarized light filter 25e, 25f, 25g to adjust the polarization direction of the illumination light that incides each liquid crystal panel 25a～25c, and from the light modulated that is penetrated by each liquid crystal panel 25a～25c, the one-tenth beam split of polarization direction of obtaining regulation is as light.
Cross dichroic prism 27 is light synthetic components, and it is pastes the plane that 4 right-angle prisms form and see roughly square shape, pasting between the right-angle prism at the interface, is formed with a pair of dielectric multilayer film 27a, the 27b that intersect with the X font.One side's the 1st dielectric multilayer film 27a reflect blue light, the opposing party's the 2nd dielectric multilayer film 27b reflection red light.This cross dichroic prism 27 reflects the blue light from liquid crystal panel 25a and penetrates to the direct of travel right side on the 1st dielectric multilayer film 27a, make green glow from liquid crystal panel 25b via the 1st and the 2nd dielectric multilayer film 27a, 27b straight ahead, ejaculation, ruddiness from liquid crystal panel 25c is reflected on the 2nd dielectric multilayer film 27b and penetrate to the direct of travel left side.
Projecting lens 29 will be projected on the screen (not shown) with desirable multiplying power by the picture light of the synthetic colour of cross dichroic prism 27.That is, the color motion of desirable multiplying power that will be corresponding with drive signal that is input to each liquid crystal panel 25a～25c or picture signal, colored rest image etc. project on the screen.
Fig. 2 is the amplification profile that explanation constitutes the structure of the liquid crystal light valve that the special color of the modulating sections 25 of projector 10 shown in Figure 1 uses.This liquid crystal light valve 31 plays a role as liquid crystal indicator, and its liquid crystal panel 25a that is for example used by the blue light that is configured on the 1st light path OP1, a pair of polarized light filter 25e, the 25e that clip it constitute.
In illustrated liquid crystal light valve 31, as the 1st polarized light filter 31b of the polarizer of light incident side, as the 2nd polarized light filter 31c of the polarizer of emitting side, normal with its incident exit facet is that the Z axle is parallel with systematic optical axis SA respectively, and the mode that constitutes Nicol crossed disposes.Between this 1st and the 2nd polarized light filter 31b, 31c, dispose liquid crystal panel 31a in the mode that is clipped by them.That is, the 1st polarized light filter 31b is configured in the light incident side of liquid crystal panel 31a, and the 2nd polarized light filter 31c is configured in the emitting side of liquid crystal panel 31a.Liquid crystal panel 31a is that unit makes from the polarization direction of the incident light LI of the 1st polarized light filter 31b side incident and changes in 2 dimensions with the pixel according to input signal, and the light modulated after will changing injects to the 2nd polarized light filter 31c side as ejaculation light LO.Between liquid crystal panel 31a and two polarized light filter 31b, 31c, dispose the 1st optical compensation plate OC1 at light incident side, dispose the 2nd optical compensation plate OC2 at emitting side.This 1st and the 2nd optical compensation plate OC1, OC2 are flat, and be same with polarized light filter 31b, 31c, and becoming with systematic optical axis SA with the normal of its incident exit facet is that the parallel mode of Z axle disposes.
In liquid crystal panel 31a, on the face of liquid crystal layer 71 sides of the 1st substrate 72, be provided with transparent common electrode 75, for example be formed with alignment films 76 thereon.On the other hand, on the face of liquid crystal layer 71 sides of the 2nd substrate 73, be provided with the thin film transistor (TFT) (not shown) that is configured to rectangular a plurality of transparent pixels electrodes 77 and is electrically connected, for example be formed with alignment films 78 thereon with each transparent pixels electrode 77.At this, the inside part of the 1st substrate 72 (being main part 72b), the 2nd substrate 73, be sandwiched in liquid crystal layer therebetween 71, electrode the 75, the 77th, as the moving element of luminous energy, i.e. the part that plays a role as the liquid crystal device 80 that is used for according to the polarization state of input signal modulating the incident light LI.Each the pixel portion PP that constitutes this liquid crystal device 80 comprises: 1 pixel electrode 77; The part of common electrode 75; The part of two alignment films 76,78; The part of liquid crystal layer 71.In each pixel portion PP, utilize each key element of the micro-lens array 72a on the 1st substrate 72 that is arranged on light incident side, can compile the light beam of incident light LI, make this light beam incident selectively.And, between the 1st substrate 72 and common electrode 75, be provided with in the mode of distinguishing each pixel portion PP cancellate, black matrix 79.
In above liquid crystal device 80, alignment films the 76, the 78th, the film that is used to make the liquid crystal compounds that constitutes liquid crystal layer 71 on the direction of needs, to arrange.The alignment films 76 of light incident side makes liquid crystal compounds adjacent thereto grind direction (for example X-direction) the 1st and goes up orientation, and the alignment films 78 of emitting side makes liquid crystal compounds adjacent thereto grind direction (for example Y direction) the 2nd and goes up orientation.Do not applying under the off state of voltage to liquid crystal layer 71, alignment films 76 have make liquid crystal compounds optic axis at the plane of polarization that comprises the 1st polarized light filter 31b, be the effect that is orientated on the direction of XZ face, alignment films 78 have make liquid crystal compounds optic axis at the plane of polarization that comprises the 2nd polarized light filter 31c, be the effect that is orientated on the direction of YZ face.Its result, the optic axis of the liquid crystal compounds in the liquid crystal layer 71 disposes in the mode of twisting gradually from the 1st substrate 72 to the 2nd substrates 73.That is, with the inboard of the 1st and the 2nd substrate 72,73 be the optic axises of alignment films 76,78 disposed adjacent at one group of liquid crystal compounds of the both end sides of liquid crystal layer 71, under situation about being projected on the XY plane, for example be 90 ° twist angle mutually.Thus, can make the liquid crystal layer 71 that is sandwiched between a pair of polarized light filter 31b, the 31c, under the non-off state that applies of voltage, guarantee the maximum state (photoconduction leads to state) that sees through with normal white mode work.And, though describe in detail in the back, but the both end sides of liquid crystal layer 71 be alignment films 76,78 near the position, the plane of incidence that the optic axis of liquid crystal compounds is promptly relative with alignment films 76,78 with respect to the XY plane, exit facet etc. are not parallel subtly, but with the state configuration of certain tilt angle that tilts with respect to this plane of incidence, exit facet etc.That is, the optic axis of the liquid crystal type compound in the liquid crystal layer 71 with the state that keeps tilting with respect to systematic optical axis SA, and increases such angle state gradually according to the twist angle of the rotation of position this axle on the axle parallel with systematic optical axis SA and disposes.
On the other hand, in the conducting state that applies voltage to liquid crystal layer 71 is under the shading state (light off state), be in from two alignment films 76,78 away from the optic axis of locational liquid crystal compounds go up orientation in direction (Z-direction particularly) with the normal parallel of the 1st substrate 72.But, the both end sides of liquid crystal layer 71 be alignment films 76,78 near, the optic axis of liquid crystal compounds is roughly kept former state.Promptly, the optic axis of the liquid crystal compounds at light incident side, emitting side place is in orientation on the directions X of the plane of polarization of the 1st and the 2nd polarized light filter 31b, 31c, Y direction etc., but with the XY face, promptly the plane of incidence relative with alignment films 76,78, exit facet etc. do not become level not become vertical yet.That is, the optic axis of the liquid crystal compounds that light incident side, emitting side etc. is located maintains the state of inclination with respect to systematic optical axis SA, keeps the state of certain inclination angle or inclination polar angle with respect to the plane of incidence, exit facet etc.And, not to liquid crystal layer 71 apply voltage off state and applied under the conducting state of voltage, the optic axis that is present near the locational liquid crystal compounds of alignment films 76,78 though change a little, maintains the heeling condition with respect to XY face or the inclination of Z axle.Thereby, to be that the optical compensation of the liquid crystal layer 71 of shading state is under the situation of purpose for conducting state, suppose the pitch angle corresponding with this heeling condition is called tilt angle.
The 1st optical compensation plate OC1 that is configured in the light incident side of liquid crystal device 80 is formed by the flat crystal slab of optical material as the refractive index with positive property, it for example can be arranged to the structure with this crystal slab of glass sheet support of one flat plate shape, but, also can be arranged to flat crystal slab monomer.Constitute the optic axis of the 1st crystal slab of the 1st optical compensation plate OC1, for example parallel with respect to the XZ face, with respect to the optic axis polar angle of Z axle one-tenth regulation.That is, constitute the optic axis of the 1st crystal slab of the 1st optical compensation plate OC1, tilt, for example on X-direction, be orientated with respect to systematic optical axis SA.More than, when mentioning the thickness of the 1st optical compensation plate OC1, set the thickness of effective the 1st crystal slab of expression, this thickness d 1 describes in detail in the back, but considers the F value of incident light LI, is set the suitable value for realizing that optical compensation is such.
The 2nd optical compensation plate OC2 that is configured in emitting side is also formed by flat crystal slab, and it for example can be arranged to the structure that engages with this crystal slab of glass plate clamping of pair of plates shape, but also can be set to flat crystal monomer.Constitute the optic axis of the 2nd crystal slab of the 2nd optical compensation plate OC2, for example parallel with respect to the YZ face, with respect to the optic axis polar angle of Z axle one-tenth regulation.That is, constitute the optic axis of the 2nd crystal slab of the 2nd optical compensation plate OC2, tilt, for example on Y direction, be orientated with respect to systematic optical axis SA.More than, when the thickness of the OC2 that mentions the 2nd optical compensation plate, set the thickness of effective the 2nd crystal slab of expression, this thickness d 2, the F value of light LO is penetrated in consideration, is set the suitable value for realizing that optical compensation is such.
More than Shuo Ming the 1st and the 2nd optical compensation plate OC1, OC2 has the effect of degradation under the angle of visibility dependence that compensates the pre-dumping because of liquid crystal layer 71 synergistically and cause, the contrast.Particularly, be arranged on the 1st crystal slab among the 1st optical compensation plate OC1, be arranged on the 2nd crystal slab among the 2nd optical compensation plate OC2, prediction incident light LI and the state that penetrates the angle of light LO, eliminate effectively because of liquid crystal layer 71 to be present in incident distolateral and penetrate the liquid crystal retardation (レ タ デ-シ ヨ Application) that the pre-dumping of distolateral liquid crystal causes.Therefore, when the manufacturing of the 1st and the 2nd optical compensation plate OC1, OC2, adjust to constitute the position angle, optic axis polar angle etc. of optic axis of their the 1st and the 2nd crystal slab respectively, adjust their thickness d 1, d2 respectively.
The stretch-out view of the state of the ejaculation light LO that Fig. 3 is the explanation state that incides the incident light LI of liquid crystal panel 31a, penetrate from liquid crystal panel 31a.In the case, liquid crystal panel 31a for example is the liquid crystal panel 25a that blue light is used, thereby becomes the figure that launches the 1st light path OP1 along systematic optical axis SA.As we know from the figure, 2[° of the angular aperture α of the ejaculation light LO that penetrates from the specific pixel of liquid crystal panel 31a], under the influence of micro-lens array 72a, than 1[° of the angular aperture α of the incident light LI of the respective pixel that incides liquid crystal panel 31a] big.That is, be (tan (90 °-α 1/2))/2 as the FN1 of the F value of the light incident side of liquid crystal panel 31a, be (tan (90 °-α 2/2))/2 as the FN2 of the F value of the emitting side of liquid crystal panel 31a.Thereby the F value FN1 of light incident side is bigger than the F value FN2 of emitting side, and corresponding therewith, the thickness d 2 of thickness d 1 to the 2 optical compensation plate OC2 of the 1st optical compensation plate OC1 is big.Particularly, the ratio of the thickness d 1 of thickness d 2 relative the 1st optical compensation plate OC1 of the 2nd optical compensation plate OC2 (thickness than) become with the ratio (the F value compares) of the F value FN2 of the light incident side of the relative liquid crystal panel 31a of F value FN1 of the emitting side of liquid crystal panel 31a about equally.That is, following relation is set up.
d2/d1≈FN2/FN1 ...(1)
And, in order to reduce the influence that produces by the optically focused effect of micro-lens array 72a to the compensate function of the 2nd optical compensation plate OC2, hope is with about ratio (F value compare) about equally the mode of the ratio of the 1st phase differential r1 of relative the 1st optical compensation plate OC1 of the 2nd phase differential r2 of the 2nd optical compensation plate OC2 of systematic optical axis SA direction (phase differential than) with the F value FN1 of the light incident side of the relative liquid crystal panel 31a of F value FN2 of the emitting side of liquid crystal panel 31a, the relation of following formula is set up
r2/r1≈FN2/FN1 ...(2)
Under the situation that this relation satisfies, think the compensate function balance that can make the 1st and the 2nd optical compensation plate OC1, OC2.If this point is further described, then considering that the light incident side at micro-lens array 72a disposes the 1st optical compensation plate OC1, emitting side at micro-lens array 72a disposes the 2nd optical compensation plate OC2, when enlarging because of the angle of divergence that makes light beam by micro-lens array 72a, we can say in the 2nd optical compensation plate OC2 side, prolong effectively than the 1st optical compensation plate OC1 sidelight road.Promptly, because consider in the 2nd optical compensation plate OC2, if comparing with the 1st optical compensation plate OC1, its F value reduces, the inclination angle of then correspondingly passing through the ejaculation light LO relative system optical axis SA of the 2nd optical compensation plate OC2 becomes big, so consider to adjust the balance of the compensate function of two optical compensation plate OC1, OC2 by the recruitment that reduces to compensate the light path that reduces of following this F value with phase differential.But though describe in detail in the back, under the situation of present embodiment, the 1st and the 2nd optical compensation plate OC1, OC2 form with same inorganic material is promptly quartzy, and the value of refractive index (mean value) equates mutually.In addition, the 1st and the 2nd optical compensation plate OC1, OC2, be that the optic axis polar angle of benchmark is equally set mutually with systematic optical axis SA direction.Thereby, for the balance of the compensate function of adjusting the 1st and the 2nd optical compensation plate OC1, OC2, consider to make following formula (1) set up and get final product as long as adjust the thickness of relative the 1st optical compensation plate OC1 of the 2nd optical compensation plate OC2.
Fig. 4 (A)～Fig. 4 (D) is the skeleton view of compensation (being the compensation of liquid crystal retardation) that the pre-dumping of the 1st and the 2nd optical compensation plate OC1, OC2 is described conceptually.And, about the explanation of these Fig. 4 (A)～4 (D), be the explanation of relevant vertical incidence light to liquid crystal light valve 31.
Like that, the average pre-dumping of the plane of incidence side of liquid crystal layer 71 can be seen as for example with respect to XZ face almost parallel, with respect to the Z axle angle of inclination φ 0 parallel with systematic optical axis SA shown in Fig. 4 (A).That is, the indicatrix RIE0 of this pre-dumping becomes the state of its optic axis OA01 with respect to Z axle inclination polar angle φ 0, and optic axis OA01 roughly is orientated on+directions X.And, on the position of the plane of incidence that approaches liquid crystal layer 71, particularly extremely approach the optic axis of the liquid crystal compounds of the plane of incidence, equate with the tilt angle that applies before the voltage, generally and plane of incidence angulation be about 10 ° of less thaies.And then along with towards the liquid crystal layer central part, the optic axis of liquid crystal compounds is sharply near being the parallel angle of Z direction with plane of incidence normal direction when voltage applies.
Like that, the average pre-dumping of the outgoing plane side of liquid crystal layer 71 can be seen as for example with respect to YZ face almost parallel, with respect to the Z axle angle of inclination φ 0 parallel with systematic optical axis SA shown in Fig. 4 (B).That is, the indicatrix RIE0 of pre-dumping becomes the state of its optic axis OA02 with respect to Z axle inclination polar angle φ 0, and optic axis OA02 roughly is orientated on+Y direction.And, on the position of the outgoing plane that approaches liquid crystal layer 71, particularly extremely approach the optic axis of the liquid crystal compounds of outgoing plane, equate about 10 ° of general and plane of incidence angulation less thaies with tilt angle before applying voltage.And then along with towards the liquid crystal layer central part, the optical axis of liquid crystal compounds is sharply near being the parallel angle of Z direction with the outgoing plane normal direction when voltage applies.
Such shown in Fig. 4 (C), constitute the indicatrix RIE1 of the 1st crystal slab of the 1st optical compensation plate OC1, become its optic axis OA1 with respect to the XZ face almost parallel that comprises the directions X corresponding with grinding direction, state with respect to the Z axle inclination optic axis polar angle θ 1 parallel with systematic optical axis SA, such shown in Fig. 4 (D), the indicatrix RIE2 that constitutes the 2nd crystal slab of the 2nd optical compensation plate OC2 becomes its optic axis OA2 with respect to the YZ face almost parallel that comprises the Y direction corresponding with grinding direction, with respect to the state of the Z axle inclination optic axis polar angle θ 2 parallel with systematic optical axis SA.
Fig. 5 is the figure of comprehensive effect that the compensation of the 1st and the 2nd optical compensation plate OC1, OC2 is described conceptually.Synthesized near the plane of incidence of liquid crystal layer 71 and the outgoing plane pre-dumping, constitute two optical compensation plate OC1, OC2 the 1st and the 2nd crystal slab the refractive index anisotropy and the indicatrix RIEt that obtains has the refractive index characteristic that its optic axis OAt becomes a positive property of the major axis parallel with the Z axle.This indicatrix RIEt because the refractive index in the XY face of seeing from the Z direction equates, is circular, so for the vertical incidence light with respect to liquid crystal layer 71, compensated the liquid crystal retardation that the pre-dumping of liquid crystal layer 71 causes.In addition,, also can reduce the dependence relevant, can suppress the deterioration of the angle of visibility characteristic that causes because of liquid crystal retardation with the orientation of its incident even for oblique incidence light with respect to liquid crystal layer 71 oblique incidences.
Above explanation is the relevant explanation that impinges perpendicularly on the illumination light of liquid crystal light valve 31, and actual incident light LI expands in the scope of the FN1 of F value.Thereby, having the method for the incident light LI of this expansion as processing, need simulate, trial-production etc. to be to guarantee the performance of liquid crystal light valve 31.In addition, under the influence of micro-lens array 72a, the F value FN2 of emitting side is littler than the F value FN1 of light incident side as mentioned above, and is corresponding therewith, need make the phase differential r2 of the 2nd optical compensation plate OC2 littler than the phase differential r1 of the 1st optical compensation plate OC1 aptly.
Below, specifically describe the relation of the phase differential of the F value of incident emergent light of liquid crystal panel 31a and a pair of optical compensation plate OC1, OC2.Following table 1 expression is for concrete liquid crystal light valve 31, and under the situation of F value FN1, the FN2 of the incident emergent light that makes liquid crystal panel 31a variation, sample plot is asked for the result of integrated value of the phase differential of the 1st and the 2nd optical compensation plate OC1, OC2.And the thickness of two optical compensation plate OC1, CO2 equates.
[table 1]
At this, about the F value F1 of incident light LI, because incident light LI has rectangular section, so its light beam to the angular direction is simulated as benchmark.In addition, be configured at thickness under the situation of exiting side, calculated in the optical compensatory element of optimum condition approx the 1st phase differential R1, with the 2nd phase differential R2 of the F value accumulative total of emitting side with the F value accumulative total of light incident side.At this moment, about incident light LI, make it with per 30 ° of variations in 0 °～360 ° the scope at the position angle, making with systematic optical axis SA is that the polar angle of benchmark changes at 0 °～β [°] scope of (setting according to the F value) in every β/4[°], calculates phase differential r1, r2 etc. totally.And, by before this simulation, making the variation in thickness of the 1st and the 2nd optical compensation plate OC1, OC2 in advance, and calculate the contrast of liquid crystal light valve 31, realize the optimization of thickness in the mode that improves contrast.
Fig. 6 is than the figure of FN1/FN2 with the relation curveization of the ratio R2/R1 of phase differential integrated value with the F value.At this, represent the ratio of emitting side F value calculated value and light incident side F value calculated value of the phase differential integrated value of liquid crystal panel 31a than R2/R1.In the case, the F value becomes the inverse of the F value of following formula (1) than FN2/FN1 than FN1/FN2.From curve as can be known, the F value equates with the ratio R2/R1 of phase differential integrated value than FN1/FN2.In order to eliminate influence in the difference of light incident side and exiting side F value, must equate with the 1st phase differential R1 of the F value of light incident side accumulative total with the 2nd phase differential R2 of the F value calculating of emitting side, thus must make the thickness of the 1st optical compensation plate OC1 than the thick R1/R2 of thickness of the 2nd optical compensation plate OC2 (=FN2/FN1).Thereby, set up by the relation that makes following formula (1), (2), can adjust the balance of the compensate function of the 1st and the 2nd optical compensation plate OC1, OC2, can make the contrast, its angle of visibility characteristic etc. of liquid crystal light valve 31 better.
Above explanation is to describe as liquid crystal panel 25a and the corresponding situation of polarized light filter 25e that liquid crystal light valve 31 and blue light are used, but, the explanation of above-mentioned liquid crystal light valve 31 is applicable to the liquid crystal panel 25b that its allochromatic colour is used too, 25c and polarized light filter 25f, 25g, at each liquid crystal panel 25b, among the 25c, the 1st optical compensation plate OC1 is configured in light incident side, the 2nd optical compensation plate OC2 is configured in emitting side, and by according to the F value of incident outgoing than carrying out two optical compensation plate OC1, two optical compensation plate OC1 are carried out in the thickness adjustment of OC2 etc., the balance adjustment of the compensate function of OC2.
From above explanation as can be known, in the liquid crystal light valve 31 in the projector 10 that is assembled into present embodiment, thereby disperse such geometrical optics variation F value increase more because of the effect that is subjected to micro-lens array 72a even incide the incident light LI generation of liquid crystal panel 31a, also because the 1st phase differential r1 of the 1st optical compensation plate OC1 is big than the 2nd phase differential r2 of the 2nd optical compensation plate OC2, so can keep the balance of the compensate function of the 1st and the 2nd optical compensation plate OC1, OC2 in the mode of the influence of the increase that to eliminate this geometrical optics variation be the F value.That is, can make the compensation of two optical compensation plate OC1, OC2 good, can make the contrast, its angle of visibility characteristic etc. of liquid crystal light valve 31 further good, and then can improve the contrast of the projection image of projector 10.
More than with regard to embodiment the present invention has been described, but the present invention is not limited to above-mentioned embodiment, can implement under variety of way in the scope that does not break away from its purport, for example can realize following such distortion.
Promptly, in the above-described embodiment, be F value FN1, FN2 different that compensate the incident outgoing by the thickness of adjusting the 1st and the 2nd optical compensation plate OC1, OC2 than t2/t1, but, also can compensate the F value FN2 of incident outgoing, the difference of FN1 by adjusting optic axis polar angle θ 1, the θ 2 that sets for the 1st and the 2nd optical compensation plate OC1, OC2.And then, also can be by forming the 1st and the 2nd optical compensation plate OC1, OC2 with different refractive index anisotropic materials, and the suitable refractive index of adjusting two optical compensation plate OC1, OC2, thickness etc., compensate the F value FN2 of incident outgoing, the difference of FN1.
In addition, in the above-described embodiment, form the 1st and the 2nd optical compensation plate OC1, OC2, still, replace crystal slab, other the inorganic crystal material of a positive property can be used as the material of two optical compensation plate OC1, OC2 with crystal slab.In addition, replace crystal slab, the material that the inorganic crystal material of a property that can sapphire etc. is negative is used as two optical compensation plate OC1, OC2 uses.And then, be not only a property, and replace crystal slab, can adjust the thickness use and have optically anisotropic vapor-deposited film.
In addition, in the above-described embodiment, form the 1st and the 2nd optical compensation plate OC1, OC2, still, replace it, organic material (for example stretched PTFE film, liquid crystal etc.) can be used as the material of two optical compensation plate OC1, OC2 with inorganic material such as crystal slabs.For compensating with using under the situation of stretched PTFE film, for example relatively increase the Rth of the 1st optical compensation plate OC1 side, relatively reduce the Rth of the 2nd optical compensation plate OC2 side.In addition,, for example relatively increase the thickness of the 1st optical compensation plate OC1 side, relatively reduce the thickness of the 2nd optical compensation plate OC2 side for compensating with using under the situation of liquid crystal.
In addition, in the above-described embodiment, the 1st and the 2nd optical compensation plate OC1, OC2 and liquid crystal device 80 are disposed separatedly, still, for example can utilize transparent bonding agent, two optical compensation plate OC1, OC2 are sticked on the liquid crystal panel 31a.
In addition, in the above-described embodiment, be the liquid crystal device 80 that set to constitute liquid crystal panel 31a with twisted nematic mode work, still, liquid crystal device 80 is not limited to twisted nematic mode work.For example, the liquid crystal device 80 that can use combination to form with the liquid crystal layer and the micro-lens array 72a of the VA type of VA pattern work.In the case, usually, at light incident side (that is, the light incident side of micro-lens array 72a) configuration the 1st polarized light filter 31b of liquid crystal device 80, configuration the 1st optical compensation plate OC1 between liquid crystal device 80 and the 1st polarized light filter 31b.And then, dispose the 2nd polarized light filter 31c at the emitting side of liquid crystal device 80, configuration the 2nd optical compensation plate OC2 between liquid crystal device 80 and the 2nd polarized light filter 31c.At this moment, for example make the 2nd optical compensation plate OC2 thinner, thereby make phase differential the 1st optical compensation plate OC1, systematic optical axis SA direction bigger than phase differential the 2nd optical compensation plate OC2, systematic optical axis SA direction than the 1st optical compensation plate OC1.Thus, be subjected to the geometrical optics of dispersing and change, also can make the suitable work of the 1st and the 2nd optical compensation plate OC1, OC2 in the mode of eliminating this influence or play a role because of micro-lens array 72a even incide the light beam of liquid crystal panel 31a.
In addition, in the projector 10 of above-mentioned embodiment, be to constitute light supply apparatus 21 with illuminator 21a, a pair of lens arra 21d, 21e, polarized light transform component 21g and overlapping lens 21i, but, about lens arra 21d, 21e, polarized light transform component 21g etc., can omit, also illuminator 21a can be replaced into Different Light such as LED.
In addition, in the above-described embodiment, be to separate at the look that uses color separation optical system 23 to carry out illumination light, and after in modulating sections 25, carrying out modulation of all kinds, in cross dichroic prism 27, carry out the synthetic of picture of all kinds, but also can utilize single liquid crystal panel is that liquid crystal light valve 31 forms image.
In the above-described embodiment, only for using the example of the projector 10 of 3 liquid crystal panel 25a～25c, still, the present invention also can be applied to use in the projector of 2 liquid crystal panels, perhaps, has used in the projector of the liquid crystal panel more than 4 or 4.
In the above-described embodiment, only for carrying out the example of projector of the front type of projection from the direction of view screen, still, the present invention also can be applied to from carrying out the projector of the rear projection type of projection with the direction opposition side of view screen.
Claims (7)
1. liquid crystal indicator possesses:
Liquid crystal panel, its have comprise with the liquid crystal device of the liquid crystal of twisted nematic mode work and with the micro-lens array of above-mentioned liquid crystal device disposed adjacent;
, above-mentioned liquid crystal device is configured in the 1st optical compensation plate of the light incident side of above-mentioned liquid crystal panel for being carried out the compensation of optics; And
, above-mentioned liquid crystal device is configured in the 2nd optical compensation plate of the emitting side of above-mentioned liquid crystal panel for being carried out the compensation of optics;
Wherein, bigger about the 1st phase differential of above-mentioned the 1st optical compensation plate of systematic optical axis direction than the 2nd phase differential about above-mentioned the 2nd optical compensation plate of said system optical axis direction;
The ratio of above-mentioned the 1st phase differential of above-mentioned relatively the 1st optical compensation plate of above-mentioned the 2nd phase differential of above-mentioned the 2nd optical compensation plate, with the ratio of the effective F value of the light incident side of the relative above-mentioned liquid crystal panel of effective F value of the emitting side of above-mentioned liquid crystal panel about equally, the effective F value of the light incident side of described liquid crystal panel is (tan (90 °-α 1/2))/2, wherein α 1 is a pixel about described liquid crystal panel, in the illuminating bundle of incident with respect to the light beam corresponding opening angle of systematic optical axis maximum inclination; The F value of the emitting side of described liquid crystal panel is (tan (90 °-α 2/2))/2, and wherein α 2 is pixels about described liquid crystal panel, in the modulated beam of light that penetrates with light beam corresponding opening angle with respect to the systematic optical axis maximum inclination.
2. liquid crystal indicator according to claim 1, wherein:
The the above-mentioned the 1st and the 2nd optical compensation plate all is the flat parts that form with dead matter;
Above-mentioned the 1st phase differential and above-mentioned the 2nd phase differential, respectively according to above-mentioned systematic optical axis direction be benchmark above-mentioned the 1st optical compensation plate optic axis polar angle, refractive index and thickness and be that optic axis polar angle, refractive index and the thickness of above-mentioned the 2nd optical compensation plate of benchmark is determined with above-mentioned systematic optical axis direction.
3. liquid crystal indicator according to claim 2, wherein:
The optic axis of above-mentioned the 1st optical compensation plate has the optic axis that tilts in the direction parallel with the grinding direction of alignment films, this alignment films is arranged at the light incident side of above-mentioned liquid crystal device or the side's side in the emitting side, the optic axis of above-mentioned the 2nd optical compensation plate has the optic axis that tilts in the direction parallel with the grinding direction of alignment films, and this alignment films is arranged at the light incident side of above-mentioned liquid crystal device or the opposing party's side in the emitting side.
4. projector possesses:
Any described liquid crystal indicator of that optical modulation is used, claim 1～3;
The lighting device that above-mentioned liquid crystal indicator is thrown light on; And
The projecting lens of the image that projection is formed by above-mentioned liquid crystal indicator.
5. liquid crystal indicator possesses:
Liquid crystal panel, it has the liquid crystal device that comprises liquid crystal and at the micro-lens array of the light incident side of above-mentioned liquid crystal device;
Be configured in the 1st optical compensation plate of the light incident side of above-mentioned micro-lens array; And
Be configured in the 2nd optical compensation plate of the emitting side of above-mentioned liquid crystal panel;
Wherein, bigger about the 1st phase differential of above-mentioned the 1st optical compensation plate of systematic optical axis direction than the 2nd phase differential about above-mentioned the 2nd optical compensation plate of said system optical axis direction;
The ratio of above-mentioned the 1st phase differential of above-mentioned relatively the 1st optical compensation plate of above-mentioned the 2nd phase differential of above-mentioned the 2nd optical compensation plate, with the ratio of the effective F value of the light incident side of the relative above-mentioned liquid crystal panel of effective F value of the emitting side of above-mentioned liquid crystal panel about equally, the effective F value of the light incident side of described liquid crystal panel is (tan (90 °-α 1/2))/2, wherein α 1 is a pixel about described liquid crystal panel, in the illuminating bundle of incident with respect to the light beam corresponding opening angle of systematic optical axis maximum inclination; The F value of the emitting side of described liquid crystal panel is (tan (90 °-α 2/2))/2, and wherein α 2 is pixels about described liquid crystal panel, in the modulated beam of light that penetrates with light beam corresponding opening angle with respect to the systematic optical axis maximum inclination.
6. liquid crystal indicator according to claim 5, wherein above-mentioned liquid crystal indicator further has:
Be configured in the 1st polarization plates of the light incident side of above-mentioned liquid crystal panel; And
Be configured in the 2nd polarization plates of the emitting side of above-mentioned liquid crystal panel;
Wherein, above-mentioned the 1st optical compensation plate is configured between above-mentioned the 1st polarization plates and the above-mentioned liquid crystal panel;
Above-mentioned the 2nd optical compensation plate is configured between above-mentioned liquid crystal panel and above-mentioned the 2nd polarization plates.
7. projector possesses:
That optical modulation is used, claim 5 or 6 described liquid crystal indicators;
The lighting device that above-mentioned liquid crystal indicator is thrown light on; And
The projecting lens of the image that projection is formed by above-mentioned liquid crystal indicator.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP315489/2007 | 2007-12-06 | ||
| JP2007315489 | 2007-12-06 | ||
| JP2008270609A JP4479846B2 (en) | 2007-12-06 | 2008-10-21 | Liquid crystal display device and projector |
| JP270609/2008 | 2008-10-21 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110039148 Division CN102103290B (en) | 2007-12-06 | 2008-12-05 | Liquid crystal display device and projector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101452152A CN101452152A (en) | 2009-06-10 |
| CN101452152B true CN101452152B (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110039148 Expired - Fee Related CN102103290B (en) | 2007-12-06 | 2008-12-05 | Liquid crystal display device and projector |
| CN2008101764002A Expired - Fee Related CN101452152B (en) | 2007-12-06 | 2008-12-05 | Liquid crystal display device and projector |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 201110039148 Expired - Fee Related CN102103290B (en) | 2007-12-06 | 2008-12-05 | Liquid crystal display device and projector |
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| JP (1) | JP4479846B2 (en) |
| CN (2) | CN102103290B (en) |
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| JP6614209B2 (en) * | 2017-07-26 | 2019-12-04 | セイコーエプソン株式会社 | Liquid crystal display device and electronic device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1727955A (en) * | 1999-05-24 | 2006-02-01 | 夏普公司 | LCD device |
| JP4161602B2 (en) * | 2002-03-27 | 2008-10-08 | セイコーエプソン株式会社 | Microlens array, manufacturing method thereof, and optical apparatus |
| AU2003290555A1 (en) * | 2002-10-30 | 2004-06-07 | Colorlink, Inc. | Oblique plate compensators for projection display systems |
| JP2004198650A (en) * | 2002-12-17 | 2004-07-15 | Sony Corp | Optically compensated element and manufacturing method therefor, liquid crystal display element, and liquid crystal display device |
| JP4506183B2 (en) * | 2004-02-04 | 2010-07-21 | セイコーエプソン株式会社 | Liquid crystal device and projection display device |
-
2008
- 2008-10-21 JP JP2008270609A patent/JP4479846B2/en active Active
- 2008-12-05 CN CN 201110039148 patent/CN102103290B/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| JP2009157350A (en) | 2009-07-16 |
| JP4479846B2 (en) | 2010-06-09 |
| CN102103290B (en) | 2013-05-01 |
| CN101452152A (en) | 2009-06-10 |
| CN102103290A (en) | 2011-06-22 |
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