CN204331253U - Projection display device - Google Patents
Projection display device Download PDFInfo
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- CN204331253U CN204331253U CN201290001171.0U CN201290001171U CN204331253U CN 204331253 U CN204331253 U CN 204331253U CN 201290001171 U CN201290001171 U CN 201290001171U CN 204331253 U CN204331253 U CN 204331253U
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
- G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2073—Polarisers in the lamp house
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B33/00—Colour photography, other than mere exposure or projection of a colour film
- G03B33/10—Simultaneous recording or projection
- G03B33/12—Simultaneous recording or projection using beam-splitting or beam-combining systems, e.g. dichroic mirrors
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Abstract
A kind of projection display device, has: G LCD panel (5G), and injection is converted to the 1st polarization state and on green wavelength, has the green image light of center frequency-band; B, with LCD panel (5B), penetrates the blue image light on the blue wavelength of 2nd polarization state orthogonal with the 1st polarized light state with center frequency-band; R, with LCD panel (5R), penetrates the red image light on the red wavelength of the 2nd polarization state with center frequency-band; Cross colour splitting prism (9), penetrates each injection light of G use, B use and R LCD panel (5G, 5B, 5G) and carries out synthesizing and penetrating; And crystalline solid (11), incident the green image light of the 1st polarization state, the blue image light of the 2nd polarization state and red image light, give the phase differential corresponding to its wavelength and penetrate.
Description
Technical field
The present invention relates to the projection display device for projection image on the projection surface.
Background technology
As projection display device, be known to the projection display device of 3 plate modes, the projection display device of this 3 plate mode has: three LCD panel, and it is the red light, green light, the blue light that are separated of the incident light by penetrating from light source respectively; And cross colour splitting prism, it carries out color synthesis to the light from each LCD panel incidence.
Linearly polarized light is become through the red light of LCD panel, green light, blue light in order to form image.
In colour splitting prism, make the green light transmission as P polarized light and make to carry out reflecting in inside as the red light of S polarized light and blue light and carry out color synthesis.Therefore, green light, red light and blue light project on the projecting plane of screen under the orthogonal state of polarization axle.
Fig. 9 illustrates P polarized light and S polarized light, figure relative to the relation between the incident angle on projecting plane and reflectivity.In fig .9, with solid line, S polarized light is shown, is shown in broken lines P polarized light, the difference of S polarized light and P polarization light reflectance is shown with single dotted broken line.
As shown in Figure 9, P polarized light and S polarization light reflectance are different respectively according to the incident angle relative to projecting plane.Therefore, P polarized light is different according to the incident angle relative to projecting plane from the difference of S polarization light reflectance.
In recent years, in projection display device, use wide-angle lens as projection lens, advance short focus.Therefore, the tendency that the difference that there is the incident angle of the light be irradiated on projecting plane increases.Therefore, relative to projecting plane, the change of angle that the direction watching image along with spectators is formed, is projecting to the position of the image on projecting plane, S polarized light and P polarization light reflectance different.
When becoming S polarized light from the direction orthogonal with the polarization axle of the green light as P polarized light, in other words green light and image is observed in the direction that red light and blue light become P polarized light, seem that the brightness of the brightness ratio red light of green light and blue light is high, therefore spectators think that green shows very strong brightness disproportionation (irregular colour).
On the other hand, S polarized light is being become from red light and blue light, when the direction that green light becomes P polarized light observes image, because the brightness of the brightness ratio green light seeming red light and blue light is high, therefore spectators think that the magenta be made up of red light and blue light shows very strong brightness disproportionation (irregular colour).
In order to suppress this brightness disproportionation (irregular colour) produced in image, in the projection display device of the 3 plate modes relevant with the present invention, adopt following structure: use wavelength selective polarization rotation element, the polarization state of red light, green light, blue light unanimously and is on the projection surface projected.Following technology is disclosed: make the P polarized light having been carried out color synthesis by cross colour splitting prism consistent with the polarization direction of S polarized light in patent documentation 1.This wavelength selective polarization rotation element becomes the multi-ply construction of the different multiple organic films of lamination slow axis.
Prior art document
Patent documentation
Patent documentation 1: International Publication 2009-041038 publication
Summary of the invention
Invent problem to be solved
But, in the structure employing above-mentioned wavelength selective polarization rotation element, because wavelength selective polarization rotation element is formed by organic film, therefore the plane of incidence of wavelength selective polarization rotation element and the surface accuracy of outgoing plane poor, there is the problem that the focusing of projected image is had an impact.In addition, there are the following problems: wavelength selective polarization rotation element is due to warm and be included in its optical characteristics deterioration from the ultraviolet in the light of light source.
Therefore, the object of the invention is to, projection display device and the projecting method of the technical task that can solve above-mentioned association is provided.One example of object of the present invention is, there is provided following projection display device and projecting method: prevent for the impact of focusing performance with by deterioration that is hot and UV-induced optical characteristics, and the brightness disproportionation (irregular colour) produced in image can be reduced.
For solving the technical scheme of problem
To achieve these goals, projection display device of the present invention, has: the 1st liquid crystal display cells, penetrates the green image light on the green wavelength of the 1st polarization state with center frequency-band; 2nd liquid crystal display cells, penetrates the blue image light on the blue wavelength of the 2nd polarization state with the 1st polarization state orthogonal with center frequency-band; 3rd liquid crystal display cells, penetrates the red image light on the red wavelength of the 2nd polarization state with center frequency-band; Synthin, incident 1st liquid crystal display cells to the 3rd liquid crystal display cells each injection light and carry out synthesizing and penetrate; And crystalline solid, incident the green image light of the 1st polarization state, the blue image light of the 2nd polarization state and red image light, give the phase differential corresponding to its wavelength and penetrate.
In addition, projecting method of the present invention, to use crystalline solid to green image light, blue image light and red image light are given and are corresponded to green image light, the projected light of the phase differential of the wavelength of blue image light and red image light projects, this green image light has center frequency-band from the 1st liquid crystal display cells injection at the green wavelength of the 1st polarization state, this blue image light has center frequency-band from the 2nd liquid crystal display cells injection at the blue wavelength of the 2nd polarization state with the 1st polarization state orthogonal, this red image light has center frequency-band from the 3rd liquid crystal display cells injection at the red wavelength of the 2nd polarization state.
Invention effect
According to the present invention, prevent for the focusing impact of performance and the deterioration of optical characteristics, and give phase differential to the light inciding crystalline solid in the mode comprising various polarization state, the light that various polarization state mixes can be obtained.Therefore, it is possible to suppress brightness disproportionation (irregular colour) that the direction of the image projected on projecting plane by viewing causes, that cause due to the differing from of reflectivity produced according to the polarized light be included in projected light.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the optical system of the projection display device that embodiment is shown.
Fig. 2 is the schematic diagram of the major part of the optical system of the projection display device that embodiment is shown.
Fig. 3 is the schematic diagram of the shape of the crystalline solid possessed for illustration of the projection display device of embodiment, and (a) of Fig. 3 illustrates an example of the shape of crystalline solid 11, and (b) of Fig. 3 illustrates another example of the shape of crystalline solid 11.
Fig. 4 is the figure of the relation incided when being 0.3mm for illustration of the thickness of crystalline solid in embodiments between the wavelength of the light of crystalline solid and the phase differential given the light inciding crystalline solid.
Fig. 5 is the figure for illustration of the thickness of the crystalline solid in embodiment and the relation between the P polarized light penetrated from crystalline solid and the strength ratio of S polarized light.
Fig. 6 be for illustration of the thickness about the crystalline solid in embodiment, from the figure of the relation between the wavelength of light and light quantity of crystalline solid injection, in the wavelength band of green image light, (a) of Fig. 6 illustrates that the light quantity in the vertical direction of cross colour splitting prism, (b) of Fig. 6 illustrate the light quantity in the horizontal direction of cross colour splitting prism.
Fig. 7 is for illustration of in the projection display device of embodiment, the schematic diagram in the position that the luminance difference of projection image is on the projection surface measured and the direction that observed to image.
Fig. 8 is for illustration of in the projection display device of embodiment, from the figure relative to the frontal of image and luminance difference when observing image from the vergence direction that frontal offsets in the horizontal direction.
Fig. 9 is for illustration of about P polarized light and S polarized light, figure relative to the relation between the incident angle on projecting plane and reflectivity.
Embodiment
Below, with reference to accompanying drawing, concrete embodiment of the present invention is described.
Fig. 1 illustrates the schematic diagram of the optical system of the projection display device of embodiment.Fig. 2 illustrates the schematic diagram of the major part of the optical system of the projection display device of embodiment.
As shown in Figure 1, the projection display device 1 of embodiment has: illuminator 3; Green light as the 1st liquid crystal display cells is used and (is used hreinafter referred to as G.) LCD panel, penetrate as the P polarized light being in the 1st polarization state, the green image light on green wavelength with center frequency-band; Blue light as the 2nd liquid crystal display cells is used and (is used hreinafter referred to as B.) LCD panel 5B, penetrate as the S polarized light being in 2nd polarization state orthogonal with P polarized light, the blue image light on blue wavelength with center frequency-band; Red light as the 3rd liquid crystal display cells is used and (is used hreinafter referred to as R.) LCD panel 5R, penetrate as S polarized light, the red image light that just has center frequency-band on red wavelength; And light path component parts 6, have and form from light integrators 6a, dull and stereotyped PBS (polarization spectroscope) 6b, the field lens 6c of the light path of illuminator 3 to each R use, G use, B LCD panel 5R, 5G, 5B respectively, comprise the lens combination of relay lens 6d, 6e, comprise the mirror group of dichronic mirror 6f, 6g.In addition, each R light use, G light use, the LCD panel 5R of B light, 5G, 5B have liquid crystal cells 8a, clip liquid crystal cells 8a and be configured in the light incident side of light path and the incident side polarization plate 8b of emitting side and emitting side polarization plates 8c respectively.In addition, R light with and B light, the light incident side of incident side polarization plate 8b or the emitting side of emitting side polarization plates 8c be configured with 1/2 wavelength plate (not shown).
In addition, the projection display device 1 of embodiment has: as the cross colour splitting prism 9 of synthin (hereinafter referred to as XDP9.), incident from G light use, B light use, the LCD panel 5G of R light, each injection light of 5B, 5R, carry out color synthesis and penetrate; Crystalline solid 11, the green image light of incident P polarized light, the blue image light of S polarized light and red image light, give the phase differential corresponding to its wavelength and penetrate; And as projection lens's head group 12 of projection optical system, the incident light penetrated from crystalline solid 11, for projection image on the projection surface.
The crystalline solid 11 that projection display device 1 possesses is configured in the light path between XDP9 and projection lens's head group 12.In addition, as long as be more positioned at the position of the downstream side of light path than the injection end face of XDP9, be then not limited to the position between XDP9 and projection lens's head group 12, crystalline solid 11 also can be configured at the outside of the inside of projection lens's head group 12 and the injection side of projection lens's head group 12.In addition, crystalline solid 11 also can be configured at LCD panel 5R, the 5G of R light, G light, B light, 5B and XDP9 respective between.And, crystalline solid 11 also can as required and be configured between XDP9 and projection lens's head group 12 and LCD panel 5R, the 5G of R light, G light, B light, 5B and XDP9 respective between both sides.
Crystalline solid 11, by having optically anisotropic crystal or sapphire and being formed as tabular, produces birefringent mode to make the light inciding crystalline solid 11 and is configured in light path.Further, incident separated by dichronic mirror 6e in the crystalline solid 11 red image light on red wavelength with center frequency-band, separated there is the blue image light of center frequency-band on blue wavelength and there is the green image light of center frequency-band on green wavelength by dichronic mirror 6f.
The crystallographic axis (slow axis) that crystalline solid 11 is configured to crystalline solid 11 is not parallel and orthogonal predetermined angle relative to the polarization axle of the P polarized light penetrated from G LCD panel 5G with the respective formation of the polarization axle of the S polarized light penetrated with B LCD panel 5B from R LCD panel 5R, gives the phase differential corresponding to wavelength respectively to P polarized light and S polarized light.That is, crystalline solid 11 gives the polarizer of phase differential to play function as to the light inciding crystalline solid 11.In addition, in the present embodiment, as crystalline solid 11, be used as the crystal of uniaxial crystal or sapphire and form, but being not limited to uniaxial crystal, also can use crystal or the sapphire of biaxial crystal.In addition, under crystal or sapphire situation, its slow axis is all equal with C axle.
In crystalline solid 11, according to the wavelength of light inciding crystalline solid 11, the phase differential (postponing (retardation)) given the light of its wavelength is different.About the light that have passed through crystalline solid 11, its polarization state change according to its wavelength.The method (corresponding to the wavelength of light polarization state change method) of the phase differential change of giving corresponding to the wavelength of light is, ratio in the thickness of crystalline solid 11 on the optical axis direction of light path (hreinafter referred to as the thickness of crystalline solid 11.)。
Delay (retardation) changes to 2 π light from 0 is mixed with in the light that have passed through crystalline solid 11.In other words, in the wavelength band of red image light, green image light, blue image light, mix in the mode comprising all polarization states, red image light, green image light, blue image light wavelength band separately in there are all various polarization states.Thus, the injection light from crystalline solid 11 becomes and comprises all light of linear polarization, elliptic polarization, circularly polarized various polarization state, reduces the luminance difference produced in image.
Specifically, such as, in the wavelength band of green image light, in the light of about 490nm, give the phase differential about 0.8 wavelength, in the light of about 500nm, give the phase differential about 0.6 wavelength.Afterwards, along with wavelength becomes large, the wavelength being given to the phase differential of light diminishes in the mode slowly close to 0.Then, in the wavelength band of green image light, after the phase differential about the light of about 550nm being imparted to 1 wavelength, along with wavelength is elongated, the phase differential being given to the light of wavelength is reduced to 0.8 wavelength gradually.As mentioned above, in the wavelength band of green image light, along with wavelength is elongated, the phase differential being given to light from 0.8 wavelength close to 0 wavelength, afterwards, the phase differential being given to light from 1 wavelength close to 0.8 wavelength.That is, crystalline solid 11, in the universe of the wavelength band of green image light, gives the phase differential of 0.8 wavelength from 0.8 wavelength to next cycle continuously according to the change of wavelength.
Incide the red image light of crystalline solid 11, green image light, blue image light wavelength band separately in, crystalline solid 11 gives the phase differential at least one cycle continuously with the above-mentioned cycle for incident light.
And, crystalline solid 11 is in each wavelength band of red image light, green image light, blue image light, the light inciding crystalline solid 11 is changed to comprise all modes around the Poincare sphere polarization state of a week, thus can obtain in each wavelength band of red image light, green image light, blue image light, be mixed with the projected light comprising linear polarization, elliptic polarization, circularly polarized all polarization states.Thus, when observing projection image on the projection surface from the angled vergence direction of frontal structure for image, the luminance difference produced in image can be reduced.
In addition, by making the thickness of crystalline solid 11 thickening, in each wavelength band of red image light, green image light, blue image light, phase difference variable is large, and the number of times around Poincare sphere increases.Number of times around Poincare sphere more increases, and from the light of crystalline solid injection, be mixed with the light of more polarization states, be preferred from the viewpoint of reducing the luminance difference produced at image.
Fig. 3 illustrates the schematic diagram of the shape of the crystalline solid 11 that the projection display device 1 for illustration of embodiment possesses.In figure 3, (a) illustrates an example of the shape of crystalline solid 11, and (b) illustrates another example of the shape of crystalline solid 11.
As shown in (a) of Fig. 3, crystalline solid 11 is configured to, crystallographic axis 11a relative to the angle of the polarization axle 10s of the P polarized light penetrated from G LCD panel 5G be 135 degree, crystallographic axis 11a relative to from R with and the angle of polarization axle 10p of S polarized light of B LCD panel 5R, 5B injection be 45 degree.In contrast, even if with crystallographic axis 11a relative to the angle of the polarization axle 10s of the P polarized light penetrated from G LCD panel 5G be 45 degree, crystallographic axis 11a relative to from R with and the angle of polarization axle 10p of S polarized light of B LCD panel 5R, 5B injection be that the mode of 135 degree configures, also can obtain identical effect.That is, crystalline solid 11 configures in the mode becoming 45 degree with each polarization axle 10p, 10s in the plane that crystallographic axis 11a is orthogonal with from each polarization axle 10p, 10s of R use, G use, B LCD panel 5R, P polarized light that 5G, 5B penetrate and S polarized light.
In addition, if the angle that each polarization axle 10p, 10s of the crystallographic axis 11a of crystalline solid 11 and P polarized light and S polarized light are formed is the scope of 45 degree ± about 5 degree, then can obtain the effect of roughly the same degree, can fully reduce the luminance difference produced in image.
As shown in (a) of Fig. 3, crystalline solid 11 is formed as the profile of the side had relative to crystallographic axis 11a formation 45 degree, thus easily carry out the location of crystallographic axis 11a relative to each polarization axle 10p, 10s of P polarized light and S polarized light, assembleability during bracket component (not shown) being installed to and supporting crystalline solid 11 can be improved.
In addition, as shown in (b) of Fig. 3, crystalline solid 11 is formed as having the profile of the side forming 90 degree relative to crystallographic axis 11a, thus same with the profile shown in (a) of Fig. 5, can improve assembleability when being installed to bracket component.
When Fig. 4 illustrates that the thickness of crystalline solid 11 is in embodiments 0.3mm, for illustration of the figure of the relation incided between the wavelength of light of crystalline solid 11 and the phase differential given the light inciding crystalline solid 11.In the diagram, transverse axis illustrates wavelength, and the longitudinal axis illustrates phase differential (wavelength).In addition, the crystallographic axis 11a of the crystalline solid 11 shown in Fig. 4 configures in the mode being formed 45 degree relative to each optical axis of P polarized light and S polarized light.Below, be described under crystallographic axis 11a forms the condition of 45 degree relative to each optical axis of P polarized light and S polarized light.
As shown in Figure 4, in each wavelength band of red image light, green image light, blue image light, crystalline solid 11 with the phase differential (delay) inciding the light of crystalline solid 11 from 0 mode changing to 1 wavelength, namely with comprise around Poincare sphere one week time the mode of all polarization states that produces, polarisation of light state is changed.
Fig. 5 illustrates the figure for illustration of the thickness of the crystalline solid 11 in embodiment and the relation between the P polarized light penetrated from crystalline solid 11 and the strength ratio of S polarized light.In Figure 5, transverse axis illustrates the thickness of crystalline solid 11, and the longitudinal axis illustrates the strength ratio between composition and the composition being equivalent to S polarized light being equivalent to the P polarized light comprised in the light penetrated from crystalline solid 11.In addition, in Figure 5, the light of the wavelength band of about 400 ~ about 500nm is shown with solid line, is shown in broken lines the light of the wavelength band of about 500 ~ about 600nm, the light of the wavelength band of about 600 ~ about 800nm is shown with single dotted broken line.
As shown in Figure 5, when the thickness of crystalline solid 11 is below about 0.5mm, the strength ratio between the composition of P polarized light and the composition of S polarized light becomes greatly, and the thickness along with crystalline solid 11 becomes large and strength ratio restrains little gradually.In addition, when the thickness of crystalline solid 11 has exceeded 3.0mm, strength ratio is roughly certain, when the thickness of crystalline solid 11 is 3.0mm, strength ratio can be made little fully.In addition, when being configured between XDP9 and projection lens's head group 12 by crystalline solid 11, when considering the back focal length of projection lens's head group 12, the thickness of crystalline solid 11 is preferably below 3.0mm.
From content described above, the thickness of crystalline solid 11 is set as the scope of more than 0.3mm, below 3.0mm.
At the Thickness Ratio 0.3mm hour of crystalline solid 11, in each wavelength band of red image light, green image light, blue image light, the light inciding crystalline solid 11 can not change to comprise all modes around the Poincare sphere polarization state of a week, namely postpone (retardation) can not change to 1 wavelength from 0, therefore in image, producing luminance difference, is not preferred.When the thickness of crystalline solid 11 is more than 3.0mm, the P polarization of each wavelength band and the strength ratio of S polarization certain, the effect obtained culminates, therefore can not expect the effect that more luminance difference reduces, and be not preferred when the manufacturing cost of the viewpoint of the back focal length from the viewpoint of projection lens's head group 12 and crystalline solid 11.
In addition, as the thickness of crystalline solid 11, strength ratio except the P polarization and S polarization that reduce each wavelength band also reduces except the effect of the luminance difference produced in image, the physical strength considering crystalline solid 11 respectively, be installed on crystalline solid 11 on bracket component operation in assembling operation, crystalline solid 11 manufacturing cost time, be particularly preferably about 0.8mm.
Fig. 6 illustrate for illustration of the thickness about the crystalline solid 11 in embodiment, the figure of relation between the wavelength of light that penetrates from crystalline solid 11 and light quantity.In the wavelength band of green image light, (a) of Fig. 6 illustrates that the light quantity in the vertical direction of XDP9, (b) of Fig. 6 illustrate the light quantity in the horizontal direction of XDP9.In (a) of Fig. 6 and (b) of Fig. 6, transverse axis illustrates wavelength, and the longitudinal axis illustrates light quantity.In addition, in (a) of Fig. 6 and (b) of Fig. 6, illustrate that the thickness of crystalline solid 11 is the situation of 0.3mm with fine rule, illustrate that thickness is the situation of 0.8mm with thick line.In addition, when the thickness of crystalline solid 11 is 0.3mm, 0.8mm, curve and the area equation shared by transverse axis, the total of light quantity is equal.
As shown in (a) of Fig. 6, in the wavelength band of green image light, when the thickness of crystalline solid 11 is 0.3mm, in light quantity in the vertical direction of XDP9, near 510nm, become maximum with 610nm vicinity light quantity, become the green making to mix with close to red green close to blue green.In addition, in the wavelength that light quantity becomes minimum and maximum, polarization state becomes linear polarization.On the other hand, as shown in (b) of Fig. 6, when the thickness of crystalline solid 11 is 0.3mm, in the light quantity in the horizontal direction of XDP9, in 550nm vicinity, light quantity becomes maximum, becomes the high green of purity (light quantity of the wavelength near 550nm is many).
As shown in (a) of Fig. 6, in the wavelength band of green image light, when the thickness of crystalline solid 11 is 0.8mm, compared with the situation being 0.3mm with thickness, about the phase differential given the light inciding crystalline solid 11, the number of times around Poincare sphere increases.Therefore, in the light quantity in the vertical direction of XDP9, compared with the situation being 0.3mm with thickness, light quantity becomes maximum wavelength and increases.Equally, as shown in (b) of Fig. 6, when the thickness of crystalline solid 11 is 0.8mm, compared with the situation being 0.3mm with thickness, in the horizontal direction of XDP9, light quantity becomes maximum wavelength and also increases.
Therefore, when the thickness of crystalline solid 11 is 0.8mm, compared with the situation being 0.3mm with thickness, in the vertical direction and horizontal direction of XDP9, the green that shade is close can be become.Thus, in the wavelength band of green image light, the green when observing projected light from orthogonal direction becomes the close green of shade.This each wavelength band for red image light, blue image light is also identical.
Therefore, the Thickness Ratio 0.3mm of crystalline solid 11 is more preferably 0.8mm.
As previously discussed, when the thickness of crystalline solid 11 is 0.8mm, to give the rotation angle producing phase differential in the light that makes to incide crystalline solid 11 around the mode of Poincare sphere 3 ~ 4 weeks degree.Thereby, it is possible to be reduced the effect of the luminance difference produced in image fully, and in each wavelength band of red image light, green image light, blue image light, the color observing projected light from orthogonal direction can be made close.
Finally, about the projection display device 1 of embodiment, the result measured projecting to the luminance difference that the image on projecting plane produces is described.
Fig. 7 illustrates for illustration of in the projection display device 1 of embodiment, the schematic diagram in the position that the luminance difference (colour difference) of the image projected on projecting plane is measured and the direction that observed to image.As shown in Figure 7, color luminance meter is used to measure the luminance difference (colour difference) produced at the lower left end portion S 1 and these two positions of end, bottom right S2 that project to the image S on projecting plane.Colour difference from the frontal P1 right with image S-phase and when observing image respectively from the vergence direction P2 that just right side offsets in the Fig. 7 horizontal direction is measured.
Fig. 8 illustrates for illustration of in the projection display device 1 of embodiment, respectively from the figure relative to image S luminance difference of frontal in opposite directions and image S when observing from the vergence direction just towards horizontal direction skew from front.In fig. 8, the longitudinal axis illustrates colour difference (Δ u ' v ').As projection display device 1, the structure of application short focus type, projects to image S near projecting plane.Fig. 8 illustrate side by side between XDP9 with projection lens head group 12, do not configure optical element the 1st comparative example, between XDP9 and projection lens's head group 12, configure wavelength selective polarization rotation element and the 2nd comparative example making polarization direction consistent, the embodiment that uses crystalline solid 11.As the crystalline solid 11 in embodiment, configure in the mode being formed 45 degree relative to each polarization axle of P polarized light and S polarized light, employ the crystalline solid that thickness is formed as 0.8mm.
As shown in Figure 8, when observing image S from frontal P1, the above-mentioned 1st and the 2nd comparative example and embodiment being compared, in the colour difference Δ u ' v ' resulting from image S, not occurring difference.But, from when the angled vergence direction P2 of structure observes in the horizontal direction relative to frontal P1, in the above-mentioned 1st and the 2nd comparative example and embodiment, in the colour difference Δ u ' v ' resulting from image S, there is difference.In the 1st comparative example not configuring optical element, compare the colour difference Δ u ' v ' on frontal P1, colour difference Δ u ' v ' on vergence direction P2 becomes large, significantly creates brightness disproportionation (irregular colour) when observing image S from vergence direction P2.
On the other hand, embodiment can fully obtain following effect: the value of the colour difference Δ u ' v ' on vergence direction P2 is reduced to the degree identical with using the 2nd comparative example of wavelength selective polarization rotation element, reduces the luminance difference produced when vergence direction P2 observes image S.In addition, in an embodiment, same with the 2nd comparative example, the value of the colour difference Δ u ' v ' on frontal P1, with the value of the colour difference Δ u ' v ' on vergence direction P2 on almost there is no difference, therefore, it is possible to suppress the direction of image S according to the observation and situation that brightness disproportionation (irregular colour) changes greatly.
In addition, in the above-described embodiment, although be configured to that there is a crystalline solid 11, also multiple crystalline solid can be configured along light path.Such as configure the structure of the crystalline solid of two thickness 0.3mm, the effect identical with the structure of the crystalline solid configuring a thickness 0.6mm can be obtained.
In addition, when configuring the structure of multiple crystalline solid, incide the red image light of crystalline solid, green image light, blue image light wavelength band go up separately, if with phase differential in the light inciding the multiple crystalline solid configured along light path become a more than wavelength mode, namely at least to be formed around the Poincare sphere mode of a week, then can obtain the effect identical with embodiment.
In other words, crystalline solid is divided into multiple crystalline wafer relative to the optical axis direction of light path and configures, and about each crystalline wafer, if the summation of the thickness on the optical axis direction of light path is more than 0.3mm, below 3.0mm, then obtains the effect identical with embodiment.Specifically, the crystalline solid of thickness 0.3mm is split into two crystalline wafer of thickness 0.15mm relative to the optical axis direction of light path, also can obtain identical effect even if be configured on any one position of light path.In addition, the crystalline wafer of thickness 0.15mm also can be configured at three light incident sides and the emitting side of XDP9 respectively, can obtain the effect identical with the structure of the crystalline solid with thickness 0.3mm.
As mentioned above, the projection display device 1 of embodiment has crystalline solid 11, and this crystalline solid 11 penetrates for giving the phase differential that corresponds to its wavelength from the red image light of XDP9 incidence, green image light, blue image light.Thus, the light inciding crystalline solid 11 mixes in the mode comprising various polarization state, can project to the projected light comprising various polarization state.Therefore, it is possible to suppress the difference of reflectivity that caused by the direction observing the image projected on projecting plane, that produce according to being included in the polarized light in projected light.Its result, can reduce and project to the brightness disproportionation produced in the image on projecting plane, and spectators can be suppressed to feel the situation of irregular colour of image.Particularly, be more useful in the projection display device of more than 120 degree to the visual angle (angle of view) of projection optical system.
In addition, in the projection display device 1 of embodiment, possesses crystalline solid 11, thus the easy plane of incidence to crystalline solid 11 and outgoing plane are processed accurately, prevent the impact for focusing performance and for heat or the permanance of light high, therefore, it is possible to prevent the deterioration by heat or UV-induced optical characteristics.
In addition, in above-mentioned present embodiment, although green image light becomes P polarized light, red image light and blue image light become S polarized light, also can be that green image light becomes S polarized light, red image light and blue image light and becomes P polarized light.In addition, in the projection display device 1 of embodiment, as light source, there is single source lamp 3 and form, but can certainly be configured to that separately there is R use, G use, each illuminator of B.
Label declaration
1 projection display device
5R R LCD panel
5G G LCD panel
5B B LCD panel
9 cross colour splitting prisms
11 crystalline solid
12 projection lens's head groups.
Claims (4)
1. a projection display device, has:
1st liquid crystal display cells, penetrates the green image light on the green wavelength of the 1st polarization state with center frequency-band;
2nd liquid crystal display cells, penetrates the blue image light on the blue wavelength of the 2nd polarization state with described 1st polarization state orthogonal with center frequency-band;
3rd liquid crystal display cells, penetrates the red image light on the red wavelength of described 2nd polarization state with center frequency-band;
Synthin, incident described 1st liquid crystal display cells to the 3rd liquid crystal display cells each injection light and carry out synthesizing and penetrate; And
Crystalline solid, incident the green image light of described 1st polarization state, the blue image light of the 2nd polarization state and red image light, give the phase differential of green image light, the blue image light of the 2nd polarization state and the wavelength of red image light corresponding to described 1st polarization state and penetrate.
2. projection display device according to claim 1, wherein,
Described crystalline solid is configured to crystallographic axis and forms 45 degree with described each polarization axle in the orthogonal plane of each polarization axle of described 1st polarization state and described 2nd polarization state, is more than 0.3mm, below 3.0mm relative to the thickness of the optical axis direction of described light path.
3. projection display device according to claim 2, wherein,
Described crystalline solid is divided into multiple crystalline wafer relative to the optical axis direction of described light path and configures, and the summation of the thickness of each crystalline wafer on the optical axis direction of described light path is more than 0.3mm, below 3.0mm.
4. projection display device according to claim 2, wherein,
Described crystalline solid has the side forming 45 degree relative to the side orthogonal with described crystallographic axis or described crystallographic axis.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2012/062290 WO2013171822A1 (en) | 2012-05-14 | 2012-05-14 | Projection type display device and projection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204331253U true CN204331253U (en) | 2015-05-13 |
Family
ID=49583269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201290001171.0U Expired - Lifetime CN204331253U (en) | 2012-05-14 | 2012-05-14 | Projection display device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN204331253U (en) |
| WO (1) | WO2013171822A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210116797A1 (en) * | 2018-03-29 | 2021-04-22 | Sony Corporation | Image display apparatus and image display unit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6028914B2 (en) * | 2012-12-13 | 2016-11-24 | セイコーエプソン株式会社 | Image display system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3292118B2 (en) * | 1996-10-30 | 2002-06-17 | セイコーエプソン株式会社 | Projection display device |
| JP2005321544A (en) * | 2004-05-07 | 2005-11-17 | Nikon Corp | Projection type display device |
| JP4909141B2 (en) * | 2007-03-16 | 2012-04-04 | 三洋電機株式会社 | Projection display |
| JP5355961B2 (en) * | 2007-10-16 | 2013-11-27 | 三洋電機株式会社 | Projection display device |
| JP2011075669A (en) * | 2009-09-29 | 2011-04-14 | Hitachi Consumer Electronics Co Ltd | Projection type image display device |
-
2012
- 2012-05-14 WO PCT/JP2012/062290 patent/WO2013171822A1/en active Application Filing
- 2012-05-14 CN CN201290001171.0U patent/CN204331253U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210116797A1 (en) * | 2018-03-29 | 2021-04-22 | Sony Corporation | Image display apparatus and image display unit |
| US11592735B2 (en) * | 2018-03-29 | 2023-02-28 | Sony Corporation | Image display apparatus and image display unit |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013171822A1 (en) | 2013-11-21 |
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Address after: Tokyo, Japan Patentee after: Sharp NEC display solutions Co.,Ltd. Address before: Tokyo, Japan Patentee before: NEC DISPLAY SOLUTIONS, Ltd. |
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Granted publication date: 20150513 |