CN1580838A - Polarized light conversion element and reflective liquid crystal projector using it - Google Patents
Polarized light conversion element and reflective liquid crystal projector using it Download PDFInfo
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- CN1580838A CN1580838A CN 03152230 CN03152230A CN1580838A CN 1580838 A CN1580838 A CN 1580838A CN 03152230 CN03152230 CN 03152230 CN 03152230 A CN03152230 A CN 03152230A CN 1580838 A CN1580838 A CN 1580838A
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Abstract
The present invention provides a polarized light conversion element of reflection type liquid crystal projector capable of displaying stay in grade for a long time and reflection type liquid crystal projector made up by using said polarized light conversion element. Said invention also provides a delay sheet formed from resin whose glass transition temperature is above 140 deg.C and photoelastic coefficient is below 50X10 to the minus thisteenth power sq.cm/dyne, and said delay sheet is laminated on a glass base material,and provides a polarized light conversion element which is set on the exposed surface of said delay sheet and whose surface contact angle is above 80 deg. and on the exposed surface of the delay sheet, perfecly, an anti-reflective layer is set. Said invention also provides a method for making reflection type liquid crystal projector by uisng said polarized light conversion element.
Description
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 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 by 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, is red light R, green light G and blue light B with dichronic mirror and dichroic prism with white light L beam split, uses corresponding to the liquid crystal cell of color separately and forms 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 herein 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 herein by first dichronic mirror 21, red light R is by 22 reflections of second dichronic mirror, be sent to the polarization beam splitter 24R that ruddiness is used, blue light B sees through second dichronic mirror 22, is sent to the polarization beam splitter 24B that blue light is used.
Like this, because by beam split and arrive polarization beam splitter 24R, 24G separately, the polarized light of 24B becomes P polarized light or S polarized light, if so set in advance each polarization beam splitter 24R, 24G, 24B, 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 by 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, with 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, be sent to liquid crystal cell 26R, 26G, 26B one side, 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 such element, have " Colour Select " that Colour Link company makes etc.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.Figure 1 illustrates the example of configuration polarization 40R, 40G, 40B between polarization beam splitter 24R, 24G, 24B and liquid crystal cell 26R, 26G, 26B, but can be according to circumstances, often in the front of polarization beam splitter 24R, 24G, 24B one side, promptly do not disposing polarization between dichronic mirror 22 and the polarization beam splitter 24B and between completely reflecting mirror 23 and polarization beam splitter 24G in this position yet.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.
Be used to the polarization of reflective liquid crystal projection apparatus owing under the irradiation of high light, generate heat, so make surface cool with the air cooling fan, but in order to improve cooling effectiveness, as increase air quantity, then long air-supply can make the surface attachment dust of polarization, and as reducing air-supply efficient, then storage is hot in the polarization, characteristic is changed, thus the problem that the demonstration grade of the colour balance of shown image, contrast, brightness, homogeneity etc. reduces when having long-time the use.
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, by constituting this retardation plate with specific material, can suppress the performance change that causes because of heat, and then by making the surface formation particular characteristic of this retardation plate, 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 display qualities such as the colour balance of institute's image projected and contrast, brightness, homogeneity, thereby reach purpose of the present invention.。
That is, the invention provides stacked on the glass basis material by the glass transformation temperature and 50 * 10 that has more than 140 ℃
-13Cm
2The retardation plate that the resin of the photoelastic coefficient that/dyne is following constitutes, be polarization more than 80 degree at the surface contact angle on the face of exposing of this retardation plate.In this polarization except glass basis material and 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 forms with the opposite side of reflecting surface of reflective type liquid crystal cell.More particularly, this reflective liquid crystal projection apparatus has: white light source; Optics with dichroism coating that the primaries that from the white light beam split of this white light source is red light, green light and blue light is used; 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, is not particularly limited, and 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, on sapphire glass plate and quartz glass plate during stacked polaroid, be necessary to make the absorption axes of the crystallographic axis of glass and polaroid 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, particularly the shape and the physical dimension of the liquid crystal cell that uses are therein carried out suitable selection, as provide representational example, have then on one side that the length of side is rectangle or the square of 10～100mm, diameter is the circle of 5～100mm or ellipse etc.
The glass basis material is preferably in and the stacked 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 on this dichroism coating stacked retardation plate, or can be on the face of an opposite side with the dichroism coating stacked retardation plate.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.
On the glass basis material, be laminated with retardation plate, 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 that/dyne is following 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 to get the stress σ that acts on the material be transverse axis, the birefringence n during this stress is the longitudinal axis, and then both passes are line always 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
2The resin that/dyne is following.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.The upper limit to the glass transformation temperature of the resin that constitutes retardation plate is not particularly limited, and for example can be that glass transformation temperature is the resin about 300 ℃.In addition, the lower limit of photoelastic coefficient also is not particularly limited, 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 that/dyne is following 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 norborene class etc.In commercially available norbornene resin film, " ア ト-Application " (trade name) of ヅ 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 the film that is made of these resins can 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 stacked.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)]=alog
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 stacked 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 stacked 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 stacked 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 except glass basis material and retardation plate, the polarization of linear polarizer that can also be stacked.As linear polarizer, adopt polaroid usually at the single or double stacked guard film of polariscope film.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 is layered on the glass basis material face with the opposite side of face of the retardation plate of having fitted.As the cementing agent that constitutes adhesive layer, preferably use the same pressure-sensitive type cementing agent that illustrated 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 the phase lag axle of retardation plate and linear polarizer 45 degree that stagger,
3. make the absorption axes of the phase lag axle of retardation plate and linear polarizer 67.5 degree that stagger.
In addition, for retardation plate and length of delay the retardation plate the scope of 140nm ± 5nm in of the illustrative length of delay in stacked front in the scope of 275nm ± 10nm, make their the phase lag axle so stacked 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 for 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 by herein, 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 selecting from metal, metal oxide and metal fluoride.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 selection 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 class layer is commonly referred to hard conating.Acrylic resin as constituting solidifying film layer can example illustrate epoxy acrylate resinoid, polyester acrylic esters resin, acrylic resin, methyl acrylic ester resin, acrylic acid urethanes resin etc.The layer that is made of curable resin for example can be by 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 particularly limited, and for example available rolling method, photogravure are coated with method coatings such as method, spraying process.The curable resin that so obtains can make it to solidify by 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 suitable layer structure of polarization of the present invention now is described according to Fig. 2.In (a) of Fig. 2, on a face of glass basis material 41,, constitute polarization 40 through the stacked 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, stack gradually linear polarizer 43 and retardation plate 42, constitute polarization 40 through separately adhesive layer (not shown).In this embodiment,, form anti-reflecting layer 48, in addition,, also form anti-reflecting layer 49 in exposing on the face 46 of retardation plate 42 also in the exposing on the face 45 of glass basis material 41.
For 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 herein 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 as contact angle.Have again, be limited to 180 degree on the contact angle.
When retardation plate 45 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 herein.Therefore, to lay the layer that constitutes by fluoride, contact angle can 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, be not particularly limited, for preventing surface contamination, used material for example can be enumerated fluorine containing silane compound etc. usually.For preventing to adhere to from the teeth outwards dirty bursting such as fingerprint, use this fluoride usually.As desirable fluorine containing silane compound, specifically, for example can enumerate compound with following general formula (I) expression.
In the formula, R
0The number of expression carbon is 1～16 straight chain shape or branch-like perfluoroalkyl, and X represents iodine atom or hydrogen atom, and Y represents hydrogen atom or low alkyl group, and Z represents 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 represents 0 or 1, and m represents 0～1 integer, and n represents 0～2 integer, p represents 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 polarization 40R, the 40G in the front that is configured in liquid crystal cell 26R, the 26G corresponding, 26B, at least one use among the 40B 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 the P polarized light of color separately or S polarized light reflex to polarization beam splitter 24R, 24G, 24B that liquid crystal cell 26R, 26G, 26B one side are used; Liquid crystal cell 26R, 26G, 26B; Be configured at least one polarization of the present invention by a positive side (be not tight front also can) than this liquid crystal cell 26R, 26G, 26B.
For reflective liquid crystal projection apparatus, among by the primaries after the beam split, the luminous energy of blue light is high especially, so polarization 40B for 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.
For 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 liquid crystal cell 26R, 26G or any side configuration of 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 describe the present invention, but the present invention is not limited by these examples.
Example 1
[ヅ 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, make the retardation plate that length of delay is 112nm, 138nm and 153nm.At coating acrylic compounds cured resin on the single face of respective delay sheet and after 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 evaporation.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 retardation plate that obtains is above fitted on the side of not carrying out anti-reflex treated of the glass that single face has been carried out anti-reflex treated, make polarization with the face of this fluorine containing silane compound of uncoated by 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, make the retardation plate that length of delay is 112nm, 138nm and 153nm.On their single face, form anti-reflecting layer with evaporation.And then on the surface of this anti-reflecting layer the coating with example 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 retardation plate that obtains is above fitted on the side of not carrying out anti-reflex treated of the glass that single face has been carried out anti-reflex treated, make polarization with the face of this fluorine containing silane compound of uncoated by 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, will The reflective liquid crystal projection apparatus that this polarization is configured in the front of liquid crystal cell can make throw The reduction of the display qualities such as the colour balance of the image of penetrating, contrast, brightness, uniformity diminishes.
Claims (6)
1. polarization is characterized in that:
Stacked on the glass basis material by the glass transformation temperature and 50 * 10 that has more than 140 ℃
-13Cm
2The retardation plate that the resin of the photoelastic coefficient that/dyne is following constitutes is more than 80 degree at the surface contact angle that exposes on the face of this retardation plate.
2. polarization as claimed in claim 1 is characterized in that:
Retardation plate exposes at it and has anti-reflecting layer on face.
3. polarization as claimed in claim 1 or 2 is characterized in that:
Retardation plate more than 2 is stacked together.
4. polarization as claimed in claim 1 or 2 is characterized in that:
Retardation plate is 1/4 wavelength sheet.
5. the polarization described in each of claim 1～4 is characterized in that:
Linear polarizer is laminated between glass basis material and the retardation plate.
6. reflective liquid crystal projection apparatus is characterized in that:
Polarization described in each of claim 1～5 is configured in a side opposite with the reflecting surface of reflective type liquid crystal cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03152230 CN1580838A (en) | 2003-07-31 | 2003-07-31 | Polarized light conversion element and reflective liquid crystal projector using it |
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| CN 03152230 CN1580838A (en) | 2003-07-31 | 2003-07-31 | Polarized light conversion element and reflective liquid crystal projector using it |
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| CN2011102199406A Division CN102426401A (en) | 2003-07-31 | 2003-07-31 | Polarized light conversion element and reflection-type liquid crystal projector using same |
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| CN1580838A true CN1580838A (en) | 2005-02-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109690393A (en) * | 2016-04-08 | 2019-04-26 | 法雷奥舒适驾驶助手公司 | Video generation device, the head-up display including such device and the method for manufacturing video generation device |
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2003
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109690393A (en) * | 2016-04-08 | 2019-04-26 | 法雷奥舒适驾驶助手公司 | Video generation device, the head-up display including such device and the method for manufacturing video generation device |
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