CN102426401A - Polarized light conversion element and reflection type liquid crystal projector using the same - Google Patents
Polarized light conversion element and reflection type liquid crystal projector using the same Download PDFInfo
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- CN102426401A CN102426401A CN2011102199406A CN201110219940A CN102426401A CN 102426401 A CN102426401 A CN 102426401A CN 2011102199406 A CN2011102199406 A CN 2011102199406A CN 201110219940 A CN201110219940 A CN 201110219940A CN 102426401 A CN102426401 A CN 102426401A
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- liquid crystal
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- Polarising Elements (AREA)
- Projection Apparatus (AREA)
Abstract
The invention provides a polarized light conversion element of a reflection type liquid crystal projector capable of realizing stable display quality for a long time, and further provides a reflection type liquid crystal projector using the polarized light conversion element. The present invention provides a glass substrate (41) laminated with a glass transition temperature of 140 ℃ or higher and a glass transition temperature of 50X 10-13cm2A retardation sheet (42) made of resin having a photoelastic coefficient of no more than dyne, and a polarization conversion element (40) having a surface contact angle of 80 degrees or more on an exposed surface (46) of the retardation sheet (42). An antireflection layer (49) is preferably provided on the exposed surface (46) of the retardation plate (42). In addition to the glass substrate (41) and the retardation plate (42), a line polarizing plate (43) may be laminated. The polarization conversion element (40) is disposed on the side opposite to the reflection surface of the reflection type liquid crystal cell, and is used as a reflection type liquid crystal projector.
Description
The application is dividing an application of following application:
Denomination of invention: polarization with used its reflective liquid crystal projection apparatus
The applying date: on July 31st, 2003
Application number: 03152230.0
Technical field
The present invention relates to be used for the polarization of liquid crystal projection apparatus, and then relate to the reflective liquid crystal projection apparatus that has used it.
Background technology
Liquid crystal projection apparatus as personal computer and televisor and so on can amplified video etc. image and the device of on screen, showing just be widely used.And, in the past, used the projector of transmission-type liquid crystal box to be main flow, but, developed the reflective liquid crystal projection apparatus that has used reflective type liquid crystal cell in recent years with miniaturization and the high-precision purpose that is refined as.
As the notion of reflective liquid crystal projection apparatus is described according to Fig. 1, then this liquid crystal projection apparatus is made up of light-source system 10, image formation system 20 and amplification projection system 30 usually.Light-source system 10 adularescent light sources 11, UVIR color filter 12 and collector lens 13 through UVIR color filter 12 filtering ultraviolet ray and infrared rays, and then with collector lens 13 optically focused, and make it to be sent to image formation system 20 from the white light L of white light source 11.Have, in light-source system 10, general using polarization beam splitter 14 (also often abbreviating PBS as) is transformed to P polarized light or S polarized light again.In white light source 11, use the high brightness lamp of metal halide lamp or high-pressure sodium lamp etc. usually.
In image formation system 20; Use dichronic mirror and dichroic prism that white light L beam split is red light R, green light G and blue light B, use corresponding to the liquid crystal cell of color separately and form the image of color separately, then; Carry out look synthetic after, be sent to enlarging projection system 30.In Fig. 1, the example that has used dichronic mirror 21,22 is shown.That is, first dichronic mirror 21 only sees through red light R and blue light B, and the red light R and the blue light B that see through here are sent to second dichronic mirror 22.Green light G by 21 reflections of first dichronic mirror is sent to completely reflecting mirror 23, is sent to the polarization beam splitter 24G that green glow is used after the reflection herein.On the other hand; Second dichronic mirror 22 only sees through blue light B; Arrived among the red light R and blue light B here through first dichronic mirror 21, red light R is sent to the polarization beam splitter 24R that ruddiness is used by 22 reflections of second dichronic mirror; Blue light B sees through second dichronic mirror 22, is sent to the polarization beam splitter 24B that blue light is used.
Like this; Owing to become P polarized light or S polarized light by beam split and the polarized light that arrives separately polarization beam splitter 24R, 24G, 24B; So if each polarization beam splitter 24R, 24G, 24B are set in advance; Make the P polarized light or the S polarized light of institute's incident reflex to liquid crystal cell 26R, 26G, 26B one side, then reflexed to its back side one side by the face of each polarization beam splitter, warp is corresponding to polarization 40R, 40G, 40B of all kinds; Arrive reflective type liquid crystal cell 26R, 26G, 26B, form image of all kinds herein.And; The polarized light of reflecting surface reflection of the back side one side that is set at reflective type liquid crystal cell 26R, 26G, 26B is once more through liquid crystal cell 26R, 26G, 26B, polarization 40R, 40G, 40B and polarization beam splitter 24R, 24G, 24B; Be sent to look synthetic prisms 28; It is synthetic to carry out look herein, is sent to amplify projection system 30.Have again; When in light-source system 10, polarization beam splitter 14 not being set; Be arranged on image formation system 20 in of all kinds corresponding polarization beam splitter 24R, 24G, 24B in; Required P polarized light or S polarized light are reflected, and are sent to liquid crystal cell 26R, 26G, 26B one side, and remaining passing through transmission or reflex to light source one side is consumed.
In image formation system 20, also often make the element of the linearly polarized light rotation of specific wavelength.As the element of that kind, Colour Link manufactured " Colour Select " etc. arranged.In addition, Yi Bian polarization 40R, 40G, 40B are used for making the rotation of linear polarization polarization surface, Yi Bian make linearly polarized light roughly become circularly polarized light.The example of configuration polarization 40R, 40G, 40B between polarization beam splitter 24R, 24G, 24B and liquid crystal cell 26R, 26G, 26B has been shown in Fig. 1; But can be according to circumstances; Also one side not in this position and in the front of polarization beam splitter 24R, 24G, 24B is often promptly disposing polarization between dichronic mirror 22 and the polarization beam splitter 24B and between completely reflecting mirror 23 and polarization beam splitter 24G.In addition, herein, show at first green light is carried out beam split, then red light and blue light are carried out the form of beam split, but utilize the selection of dichronic mirror, the order of beam split can at random change.
Amplifying projection system 30 has projection lens 31, herein, is exaggerated corresponding to the image of separately light, and enlarged image is projected on the screen 32.
About such reflective liquid crystal projection apparatus or use therein polarization beam splitter and polarization; Various motions (for example, spy open 2000-206463 communique, spy are opened the 2001-209024 communique, the spy opens the 2001-215491 communique and the spy opens flat 11-231132 communique) have been proposed so far.
The polarization that is used to reflective liquid crystal projection apparatus is because heating under the irradiation of high light; So make surface cool with the air cooling fan; But in order to improve cooling effectiveness, as increasing air quantity, then long air-supply can make the surface attachment dust of polarization; And as reducing air-supply efficient; Then storage heat in the polarization changes characteristic, thus the problem that exists the demonstration grade of the long-time colour balance that uses time institute's images displayed, contrast, brightness, homogeneity etc. to reduce.
Summary of the invention
Therefore, the inventor can be implemented in the long-time middle polarization that shows the reflective liquid crystal projection apparatus that grade is stable in order to develop, and studies always.Consequently; Discovery is for the polarization of applying retardation plate on the glass basis material; Through constituting this retardation plate, can suppress the performance variation that causes because of heat, and then form particular characteristic through the surface that makes this retardation plate with specific material; Promptly use the air cooling fan to improve cooling effectiveness; Can not adhere to dust yet, can obtain the reduction reflective liquid crystal projection apparatus seldom of the display quality such as colour balance and contrast, brightness, homogeneity of institute's image projected, thereby reach the object of the invention.
That is, the invention provides in glass basis material laminated by the glass transformation temperature and 50 * 10 that has more than 140 ℃
-13Cm
2The retardation plate that the resin of the photoelastic coefficient the below/dyne constitutes, be the polarization more than 80 degree at the surface contact angle that exposes on the face of this retardation plate.In this polarization except the glass basis material with the retardation plate, but also superimposed line polaroid.
This polarization is assembled in the reflective liquid crystal projection apparatus and uses.Therefore, the present invention also provides above-mentioned polarization has been configured in the reflective liquid crystal projection apparatus that the opposite side of reflecting surface with reflective type liquid crystal cell forms.More particularly, this reflective liquid crystal projection apparatus has: white light source; Optics with dichroism coating of using the primaries that from the white light beam split of this white light source is red light, green light and blue light; Only make P polarized light or S polarized light in the color separately reflex to the polarization beam splitter that liquid crystal cell one side is used; Reflective type liquid crystal cell; And above-mentioned polarization.
Description of drawings
Fig. 1 is the figure that the structure example of reflective liquid crystal projection apparatus roughly is shown.
Fig. 2 is the diagrammatic cross-section that the layer example of structure of polarization of the present invention is shown.
Embodiment
The glass basis material that is applied to polarization of the present invention needs only transparent, does not have special qualification, for example can be blank glass, backboard glass, sapphire glass plate, quartz glass plate etc.Especially, because the coefficient of heat conductivity of sapphire glass plate and quartz glass plate is big, radiating efficiency is good, and is very good.The sapphire glass plate is aluminium oxide (Al
2O
3) monocrystal, for example use EFG method (edge limited film is presented growth method) to form and can be used after tabular.Quartz glass plate is SiO
2Monocrystal, natural quartz and synthetic quartz all can.Have again, when using sapphire glass plate and quartz glass plate, be necessary to make the outrigger shaft of its crystallographic axis and retardation plate unanimous on the whole, or 90 degree that roughly stagger.In addition, when sapphire glass plate and quartz glass plate laminated polaroid, be necessary to make the absorption axes of crystallographic axis and polaroid of glass unanimous on the whole, or 90 degree that roughly stagger.
In the occasion of glass plate, its thickness is generally about 0.1～3mm, is preferably about 0.3～2mm.In addition; The shape of glass plate and physical dimension are according to the reflective liquid crystal projection apparatus as target; The shape and the physical dimension of the liquid crystal cell that particularly uses are therein carried out suitable choice; As provide representational example, and having then on one side that the length of side is rectangle or the square of 10～100mm, diameter is circle or the ellipse of 5～100mm etc.
The glass basis material is preferably in and the range upon range of face of the opposite side of retardation plate one side, promptly exposes to have anti-reflecting layer on the face.In addition, the glass basis material forms the dichroism coating at its single or double, can have the light that only sees through particular range of wavelengths, and does not see through the characteristic of the light of other wavelength coverage.When single face has the dichroism coating, can be at this dichroism coating laminated retardation plate, or can be at the face laminated retardation plate of an opposite side with the dichroism coating.In addition, the glass basis material can be the polarization beam splitter of the glass component more than 2 or 2 of having fitted.On the glass of polarization beam splitter, also can have above-mentioned dichroism coating.Can also use plano-convex lens or plano-concave lens etc.
In glass basis material laminated retardation plate is arranged, and this retardation plate is by the glass transformation temperature and 50 * 10 that has more than 140 ℃
-13Cm
2The resin of the photoelastic coefficient the below/dyne constitutes.If adopt by glass transformation temperature and be lower than 140 ℃ or photoelastic coefficient greater than 50 * 10
-13Cm
2The retardation plate that the resin of/dyne constitutes when the liquid crystal projection apparatus of then having assembled this retardation plate is used for a long time, is easy to cause the reduction of display quality.Have, photoelasticity is meant isotropy again, i.e. birefringence is that 0 material applies external force and when producing stress in inside, presents optical anisotropy and shows birefringent phenomenon.The stress (acting on the power on the unit area) that acts on the material when supposition is σ, and when birefringence was Δ n, the proportional in theory example relation of stress σ and birefringence n can be expressed as Δ n=C σ, and this C is a photoelastic coefficient.In other words, if getting the stress σ that acts on the material is transverse axis, the birefringence n during this stress is the longitudinal axis, and then both relations are a straight line in theory, and the slope of this straight line is photoelastic coefficient.
In the present invention, as retardation plate, can use that glass transformation temperature is more than 140 ℃, photoelastic coefficient is 50 * 10
-13Cm
2Resin below the/dyne.This glass transformation temperature is to be advisable more than 150 ℃, then better more than 160 ℃.In addition, photoelastic coefficient is with 10 * 10
-13Cm
2Be advisable below/the dyne, 6 * 10
-13Cm
2/ dyne is with next better.To the not special restriction of the upper limit of the glass transformation temperature of the resin that constitutes retardation plate, for example can be that glass transformation temperature is the resin about 300 ℃.In addition, to the also not special restriction of the lower limit of photoelastic coefficient, for example. can be that photoelastic coefficient is 0.1 * 10
-13Cm
2Resin about/dyne.
Glass transformation temperature is more than 140 ℃ as showing, photoelastic coefficient is 50 * 10
-13Cm
2The resin of the characteristic the below/dyne for example can be enumerated the cyclic polyolefin hydrocarbon resin, polycarbonate resin, polysulfones resin, polyether sulfone resin, polyester resin, polyimide based resin, polyamide-based resin, polyarylate resinoid of the monomer that has adopted the ENB class etc.In commercially available norbornene resin film, " ア ト-Application " (trade name) of ジ エ イ エ ス ア-Le (strain) system and " Zeonex " (trade name) of Japanese ゼ オ Application (strain) system etc. are arranged.In addition in commercially available polycarbonate resin film, have " ピ ユ ア エ-ス WR " (trade name) of Supreme Being people's (strain) system etc.
During from these resins making retardation plates, for example can the film that be made up of these resins be stretched, can make retardation plate with target delay according to the degree that stretches.In addition, also can adopt commercially available retardation plate.The thickness of retardation plate is generally about 10～500 μ m, is preferably in more than the 50 μ m, below the 150 μ m.
At retardation plate is the occasion of 1/4 wavelength sheet, and this length of delay is about 125～145nm when for green light, and is about 108～125nm when for blue light when the light that sees through this retardation plate is about 145～175nm during for red light.At retardation plate is the occasion of 1/2 wavelength sheet, and this length of delay is about 250～290nm when for green light, and is about 216～250nm when for blue light when the light that sees through this retardation plate is about 290～350nm during for red light.
This retardation plate is in face one side of glass basis material, for example through adhesive layer and by range upon range of.As the cementing agent of this moment, adopt the material of transparent optical isotropy usually.Specifically, pressure-sensitive type cementing agents such as acrylic compounds pressure-sensitive type cementing agent, urethanes pressure-sensitive type cementing agent, silicone pressure-sensitive type cementing agent preferably.The thickness of adhesive layer is generally about 10～60 μ m, is preferably 10～30 μ m.Have, pressure-sensitive type cementing agent is also referred to as cementing agent again.
This cementing agent is the pressure-sensitive type cementing agent of slip in-0.14～-0.09 scope of relaxed modulus of elasticity 25 ℃ the time preferably.Cementing agent generally shows viscoelasticity, as give strain γ to viscoelastic body instantaneously
0After make it to keep constant, then stress σ (t) reduces in time, finally levels off to steady state value, this steady state value is called stress relaxation, but this moment, lax stress σ (t) can be expressed as σ (t)=G (t) γ
0, G (t) is and the elastic modulus of time correlation, is referred to as relaxed modulus of elasticity.In other words, relaxed modulus of elasticity is stress σ (t) that reduces in time and the constant strain γ that applies from the outside
0The ratio.And the relaxed modulus of elasticity G (t) that measures when the slip of relaxed modulus of elasticity means with 25 ℃ of temperature in the time of 25 ℃ be the longitudinal axis, with time t (unit: be the temporary transient slope of transverse axis when making bilogarithmic graph second), be the value a in the following formula,
log
10[G(t)]＝a·log
10[t]+b
(in the formula, a and b are constant).The slip a of relaxed modulus of elasticity can be from log
10[G (t)] is to log
10The value of [t] is tried to achieve by least square method.
In polarization of the present invention, preferably that retardation plate is range upon range of more than 2.At this moment, the length of delay of multi-disc retardation plate both can be identical, also can be different.In addition, it is unanimous on the whole that the range upon range of 2 applying angles when above of retardation plate can make the phase lag direction of principal axis that makes separately, and these directions are staggered.2 1/4 wavelength sheets make phase lag axle separately unanimous on the whole if fit, and then finding has same function with 1/2 wavelength sheet.In addition, if retardation plate and length of delay the retardation plate the scope of 140nm ± 5nm in of range upon range of length of delay in the scope of 275nm ± 10nm, make the phase lag axle stagger 60 the degree, then find in the wavelength coverage of broadness, to have the function of 1/4 wavelength sheet.
Polarization of the present invention is except the glass basis material with the retardation plate, the polarization of linear polarizer that can also be range upon range of.As linear polarizer, be employed in the polaroid of the single or double stacked guard film of polariscope film usually.As the polariscope film, for example can adopt dichroic dye or iodine are adsorbed onto the polariscope film that makes it to be orientated in the polyvinyl alcohol resin film, and it is comparatively desirable at aspects such as thermotolerances especially to adsorb the polariscope film that dichroic dye makes it to be orientated.As the diaphragm of linear polarizer, the film that for example can adopt the cellulosic resin by diacetyl cellulose or tri acetyl cellulose and so on to constitute.
Linear polarizer for example is laminated between retardation plate and the glass basis material through adhesive layer, or be layered in and the glass basis material face of the opposite side of face of the retardation plate of having fitted on.As the cementing agent that constitutes adhesive layer, preferably use the same pressure-sensitive type cementing agent of explaining with the front, at this moment, preferably the slip of relaxed modulus of elasticity is-0.14～-0.09 pressure-sensitive type cementing agent 25 ℃ the time.The thickness of adhesive layer is generally about 10～60 μ m, is preferably 10～30 μ m.
The configuration of retardation plate and linear polarizer should suitably be selected, and for example can enumerate following form.
1. make the phase lag axle of retardation plate consistent with the absorption axes of linear polarizer,
2. make the absorption axes of phase lag axle and the linear polarizer of retardation plate 45 degree that stagger,
3. make the absorption axes of phase lag axle and the linear polarizer of retardation plate 67.5 degree that stagger.
In addition; For the retardation plate of retardation plate and the length of delay of the illustrative length of delay in range upon range of front in the scope of 275nm ± 10nm in the scope of 140nm ± 5nm, make their the phase lag axle so range upon range of retardation plate of 60 degree that staggers, preferably the phase lag axle of the absorption axes of linear polarizer and the retardation plate of length of delay in the scope of 275nm ± 10nm is configured to stagger and 15 spends.This lamination order for example can be lifted following structure as desirable structure.
1. length of delay is that retardation plate/length of delay of 140nm ± 5nm is retardation plate/linear polarizer/glass basis material of 275nm ± 10nm,
2. length of delay is that retardation plate/length of delay of 140nm ± 5nm is retardation plate/glass basis material/linear polarizer of 275nm ± 10nm,
3. length of delay is that retardation plate/glass basis material/length of delay of 140nm ± 5nm is retardation plate/linear polarizer of 275nm ± 10nm.
In polarization of the present invention, to show from air layer for one of retardation plate, this reflectivity that exposes face can also be below 1% below 2%, and owing to the generation of the diffused light that can suppress to cause because of reflected light, this value is comparatively desirable.Like this, for reducing reflectivity, for example can form anti-reflecting layer on the face in exposing of retardation plate.Anti-reflecting layer can be arranged on the surface of retardation plate with usual way.Have, the reflectivity that exposes face of retardation plate can be below 2% in the whole field of visible light again, but for the light wavelength scope through here, as be below 2%, be exactly effective.
As anti-reflecting layer, normally used material for example can be enumerated the single or multiple lift material of from metal, metal oxide and metal fluoride, selecting.As metal, for example can enumerate silver etc., as metal oxide, for example can enumerate monox, aluminium oxide, titanium dioxide, tantalum oxide, yttria, zirconia etc., as metal fluoride, for example can enumerate magnesium fluoride etc.This anti-reflecting layer can be an individual layer, also can be by 2 layers, 3 layers, the multilayer that constitutes of layer more than 4 layers or 4 layers.The thickness of the thickness of anti-reflecting layer or its each layer during for multilayer can carry out suitable choice according to the refractive index of material used in its number of plies, each layer etc.
This anti-reflecting layer for example usual ways such as the physical vapor deposition of vacuum available vapour deposition method, sputtering method, ion plating method and so on (PVD) method, coating method lays.
Have again, between anti-reflecting layer and retardation plate, solidifying film layer can be arranged.As solidifying film layer, for example can enumerate and make the layer that constitutes by acrylic resin, silicone resin, melamine resinoid, urethanes resin, epikote etc. curable resin solidify the layer form.This type layer is commonly referred to hard conating.As the acrylic resin that constitutes solidifying film layer, but illustration goes out epoxy acrylate resinoid, polyester acrylic esters resin, acrylic resin, methyl acrylic ester resin, acrylic acid urethanes resin etc.The layer that is made up of curable resin for example can be through being provided with on the surface that curable resin is coated in phase shift films.Curable resin can contain adjuvants such as equal paint, polymerization initiator.The thickness of cured coating film layer is preferably about 1～10 μ m, as is then better about 2～5 μ m.
The coating method of curable resin is not done special qualification, and for example available rolling method, photogravure are coated with methods such as method, spraying process and apply.The curable resin that so obtains can make it to solidify through methods such as ultraviolet ray irradiation, electron beam irradiation, heat curings, forms solidifying film layer.The thickness of solidifying film layer is generally below the 10 μ m, is preferably more than the 1 μ m, also can be 6 μ m.The thickness of solidifying film layer is as surpassing 10 μ m, and then solidifying film layer has the trend that causes slight crack easily.On the other hand, this thickness then produces visible light easily and interferes as less than 1 μ m.
The existing suitable layer structure that polarization of the present invention is described according to Fig. 2.In (a) of Fig. 2, on a face of glass basis material 41,, constitute polarization 40 through the range upon range of retardation plate 42 of adhesive layer (not shown).And, in exposing on the face 45 of glass basis material 41, form anti-reflecting layer 48.In addition, in exposing on the face 46 of retardation plate 42, also form anti-reflecting layer 49.On the other hand, in (b) of Fig. 2, on a face of glass basis material 41, warp adhesive layer (not shown) separately stacks gradually linear polarizer 43 and retardation plate 42, constitutes polarization 40.In this example, also in the exposing on the face 45 of glass basis material 41, form anti-reflecting layer 48, in addition,, also form anti-reflecting layer 49 in exposing on the face 46 of retardation plate 42.
As far as polarization of the present invention,, for example has contact angle on the face of anti-reflecting layer 49 more than 80 degree at the outside surface of retardation plate 42.This surface contact angle as be 100 the degree more than then better.Said here contact angle is the value when using water as liquid.Less than 80 degree, then because particulate such as dust and spot are adhered to easily, and the liquid crystal projection apparatus that has used the polaroid inverting element with such surface is when long-time the use, contrast has the trend of easy reduction like contact angle.Have again, be limited to 180 degree on the contact angle.
When retardation plate 42 for example had anti-reflecting layer 49, the contact angle that exposes face (with the surface of retardation plate 42 opposite sides) of anti-reflecting layer 49 was to get final product more than 80 degree.
Retardation plate with anti-reflecting layer is also on sale on market, but common anti-reflecting layer does not have the contact angle of regulation here.Therefore, to lay the layer that constitutes by fluoride, can contact angle be made more than 80 degree at the upper surface of anti-reflecting layer 49.As long as used for this reason fluoride can make contact angle more than 80 degree, do not have special qualification, for preventing surface contamination, used material for example can be enumerated fluorine containing silane compound etc. usually.For preventing to adhere to spots such as fingerprint from the teeth outwards, use this fluoride usually.As desirable fluorine containing silane compound, specifically, for example can enumerate compound with formula (I) expression.
In the formula, R
0The number of expression carbon is 1～16 straight chain shape or branch-like perfluoroalkyl, and X representes iodine atom or hydrogen atom, and Y representes hydrogen atom or low alkyl group, and Z representes fluorine atom or trifluoromethyl, R
1Expression can add the base of water decomposition, R
2Expression hydrogen atom or inactive any monovalent organic radical, a, b, c and d represent 0～200 integer independently of one another, and e representes 0 or 1, and m representes 0～1 integer, and n representes 0～2 integer, p representes the integer more than 1.
More particularly, for example can enumerate with following formula (II) expression, molecular weight is about 4,500 fluorine containing silane compound (about these fluorine containing silane compounds, for example can open flat 1-294709 communique with reference to the spy).
In the reflective liquid crystal projection apparatus that has used polarization of the present invention, the reduction of the display quality of institute's image projected has reduced.Specifically, leaning on a positive side than the liquid crystal cell that constitutes reflective liquid crystal projection apparatus, promptly opposite with the reflecting surface of a reflective type liquid crystal cell side disposes and uses this polarization.More particularly, in reflective liquid crystal projection apparatus shown in Figure 1, can be used as at least one use among the polarization 40R, 40G, 40B in the front that is configured in the liquid crystal cell 26R corresponding, 26G, 26B with each three primary colors.Also often according to circumstances polarization is configured in front one side of polarization beam splitter 24R, 24G, 24B; Be between dichronic mirror 22 and the polarization beam splitter 24R; Between dichronic mirror 22 and the polarization beam splitter 24B, and between completely reflecting mirror 23 and the polarization beam splitter 24G.No matter which kind of situation all has: white light source 11; Is the white light L beam split from light source 11 optics with dichroism coating (being commonly referred to dichronic mirror) 21,22 that the primaries of red light R, green light G and blue light B is used; Only make P polarized light or the S polarized light of color separately reflex to polarization beam splitter 24R, 24G, 24B that liquid crystal cell 26R, 26G, 26B one side use; Liquid crystal cell 26R, 26G, 26B; Be configured in the polarization of the present invention that leans on a positive side (be not tight front also can) than at least one of this liquid crystal cell 26R, 26G, 26B.
As far as reflective liquid crystal projection apparatus; Among by the primaries after the beam split, the luminous energy of blue light is high especially, so for the polarization 40B of the liquid crystal cell 26B corresponding with this blue light B; Be suitable for and use polarization of the present invention; But self-evident, for polarization 40R corresponding and the polarization 40G corresponding, also can use polarization of the present invention with green light G with red light R.Whole for polarization 40R, 40G, 40B all can use polarization of the present invention effectively.
As far as such reflective liquid crystal projection apparatus; Polarization of the present invention is being disposed in the position shown in the figure 1; When promptly being configured between polarization beam splitter 24R, 24G, 24B and liquid crystal cell 26R, 26G, the 26B; Retardation plate 42 1 sides of polarization 40 shown in Figure 2 also can be in Fig. 1 any side configuration of liquid crystal cell 26R, 26G or 26B one side, polarization beam splitter 24R, 24G or 24B one side, but retardation plate 42 1 sides of polarization 40 are with in the majority towards the situation of liquid crystal cell 26R, 26G or the configuration of 26B one side.
[embodiment]
Below, provide concrete example, further explain the present invention, but the present invention is not limited by these examples.
Example 1
[ジ エ イ エ ス ア-Le (strain) is made, and glass transformation temperature is about 170 ℃, and photoelastic coefficient is 4 * 10 with cyclic polyolefin resin film " ア-ト Application "
-13Cm
2/ dyne] stretch, process the retardation plate that length of delay is 112nm, 138nm and 153nm.After applying the acrylic compounds cured resin on the single face of respective delay sheet and making it drying, use ultraviolet curing, form the thick acrylic resin cured layer of about 3 μ m.Surface at this acrylic resin cured layer forms anti-reflecting layer with vapor deposition.And then the coating molecular weight suitable with following formula is about 4,500 fluorine containing silane compound on the surface of this anti-reflecting layer.
The contact angle of resulting fluorine containing silane compound applicator surface is 110 degree.Then,,, the top retardation plate that obtains is fitted on that one side of not carrying out anti-reflex treated of the glass that single face has been carried out anti-reflex treated, process polarization with the face of this fluorine containing silane compound of uncoated through acrylic adhesive.This polarization has Fig. 2's the layer structure shown in (a).
Among these polarizations; Having used length of delay is effective as the polarization of the retardation plate of 112nm to the blue channel of projection-type liquid crystal display device (reflective liquid crystal projection apparatus); In addition; To have used length of delay be effectively as the polarization of the retardation plate of 138nm to green passage equally, and having used length of delay is effective as the polarization of the retardation plate of 153nm to red passage too.And, use if these polarizations are arranged on each passage of reflective liquid crystal projection apparatus, the reduction that shows grade is diminished.
Example 2
To stretch with employed identical cyclic polyolefin resin film " ア-ト Application " in the example 1, process the retardation plate that length of delay is 112nm, 138nm and 153nm.On their single face, form anti-reflecting layer with vapor deposition.And then on the surface of this anti-reflecting layer, apply with routine 1 in employed identical molecular weight be about 4,500 fluorine containing silane compound.The contact angle of resulting fluorine containing silane compound applicator surface is 110 degree.Then,,, the top retardation plate that obtains is fitted on that one side of not carrying out anti-reflex treated of the glass that single face has been carried out anti-reflex treated, process polarization with the face of this fluorine containing silane compound of uncoated through acrylic adhesive.This polarization also has Fig. 2's the layer structure shown in (a).
Among these polarizations; Having used length of delay is effective as the polarization of the retardation plate of 112nm to the blue channel of projection-type liquid crystal display device (reflective liquid crystal projection apparatus); In addition; To have used length of delay be effectively as the polarization of the retardation plate of 138nm to green passage equally, and having used length of delay is effective as the polarization of the retardation plate of 153nm to red passage too.And, use if these polarizations are arranged on each passage of reflective liquid crystal projection apparatus, the reduction that shows grade is diminished.
[effect of invention]
Polarization of the present invention is used in the reflective liquid crystal projection apparatus effectively, and the reflective liquid crystal projection apparatus that this polarization is configured in the front of liquid crystal cell can make the reduction of display qualities such as the colour balance of institute's image projected, contrast, brightness, homogeneity diminish.
Claims (3)
1. a polarization that is used for reflective liquid crystal projection apparatus is characterized in that,
Have:
The glass basis material;
1/4 wavelength retardation plate through adhesive layer, directly is layered on the face of above-mentioned glass basis material;
First anti-reflecting layer is formed on exposing on the face of above-mentioned 1/4 wavelength retardation plate; And
Second anti-reflecting layer is formed on exposing on the face of above-mentioned glass basis material,
Wherein, above-mentioned 1/4 wavelength retardation plate is by the glass transformation temperature and 50 * 10 that has more than 140 ℃
-13Cm
2The resin of the photoelastic coefficient the below/dyne constitutes,
The surface contact angle of above-mentioned first anti-reflecting layer is more than 80 degree.
2. polarization according to claim 1 is characterized in that,
Above-mentioned retardation plate is by range upon range of more than 2.
3. a reflective liquid crystal projection apparatus is characterized in that,
By claim 1 or 2 described polarizations being configured in a side opposite with the reflecting surface of reflective type liquid crystal cell and constituting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102199406A CN102426401A (en) | 2003-07-31 | 2003-07-31 | Polarized light conversion element and reflection type liquid crystal projector using the same |
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| CN2011102199406A CN102426401A (en) | 2003-07-31 | 2003-07-31 | Polarized light conversion element and reflection type liquid crystal projector using the same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104871076A (en) * | 2013-01-15 | 2015-08-26 | 索尼公司 | Projection display device and direct-view display device |
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| JP2000206463A (en) * | 1999-01-13 | 2000-07-28 | Victor Co Of Japan Ltd | Reflection type liquid crystal projector |
| JP2002207117A (en) * | 2001-01-04 | 2002-07-26 | Sumitomo Chem Co Ltd | Polarization converting element and projection liquid crystal display device using the same |
| CN1388387A (en) * | 2001-05-29 | 2003-01-01 | 住友化学工业株式会社 | Polarized light conversion element and projection liquid crystal display using the same polarized light conversion element |
| JP2003004947A (en) * | 2001-06-25 | 2003-01-08 | Sumitomo Chem Co Ltd | Polarization converting element and projection liquid crystal display device using the same |
| JP2003172819A (en) * | 2001-12-05 | 2003-06-20 | Sumitomo Chem Co Ltd | Polarization and conversion element and projection type liquid crystal display |
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|---|---|---|---|---|
| JP2000206463A (en) * | 1999-01-13 | 2000-07-28 | Victor Co Of Japan Ltd | Reflection type liquid crystal projector |
| JP2002207117A (en) * | 2001-01-04 | 2002-07-26 | Sumitomo Chem Co Ltd | Polarization converting element and projection liquid crystal display device using the same |
| CN1388387A (en) * | 2001-05-29 | 2003-01-01 | 住友化学工业株式会社 | Polarized light conversion element and projection liquid crystal display using the same polarized light conversion element |
| JP2003004947A (en) * | 2001-06-25 | 2003-01-08 | Sumitomo Chem Co Ltd | Polarization converting element and projection liquid crystal display device using the same |
| JP2003172819A (en) * | 2001-12-05 | 2003-06-20 | Sumitomo Chem Co Ltd | Polarization and conversion element and projection type liquid crystal display |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104871076A (en) * | 2013-01-15 | 2015-08-26 | 索尼公司 | Projection display device and direct-view display device |
| CN104871076B (en) * | 2013-01-15 | 2018-05-01 | 索尼公司 | Projection display device and direct view display |
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Application publication date: 20120425 |