CN100367050C - Optical compensating board and projecting liquid crystal dispaying device therewith - Google Patents
Optical compensating board and projecting liquid crystal dispaying device therewith Download PDFInfo
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- CN100367050C CN100367050C CNB200310122073XA CN200310122073A CN100367050C CN 100367050 C CN100367050 C CN 100367050C CN B200310122073X A CNB200310122073X A CN B200310122073XA CN 200310122073 A CN200310122073 A CN 200310122073A CN 100367050 C CN100367050 C CN 100367050C
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Abstract
Provided is an optical compensator which increases the contrast of a projection liquid crystal device and also realizes high display quality for a long period and to apply it to the projection liquid crystal display device. The optical compensator 20 is constituted by laminating a transparent film 21 of <=10% in transmissivity at a wavelength of 380 nm and <=2% in reflection factor at a wavelength of 550 nm on a surface coming into contact with air, an optical compensating film formed by coating a base material film 31 with a liquid crystal compound layer 32, and a transparent glass plate 23. Two optical compensating films can be laminated and in this case, they are arranged having their alignment axes almost at right angles to each other and also laminated so that surfaces of base material films 31 and 41 on the opposite sides from surfaces coated with liquid crystal compound layers 32 and 42 are put one over the other. This optical compensator 20 is arranged on one surface side of a liquid crystal cell 7 and the transparent film 21 is arranged on the side of the liquid crystal cell 7 to constitute the projection liquid crystal display device.
Description
Technical field
The present invention relates to be applicable to the optical compensation plate of projection-type liquid crystal display device, also relate to the projection-type liquid crystal display device that uses it.
Background technology
Projection-type liquid crystal display device is called as liquid crystal projector, as the image that can amplify personal computer and televisor etc. and project to the device on the screen and be widely used.
Comprise at projection-type liquid crystal display device: will be from the direct form of amplifying of the beam split light beam of color filter with one-board, make beam split become the light beam form by corresponding permeation type liquid crystal box separately behind the three primary colors, and make beam split become the form etc. of each the free reflective type liquid crystal cell reflection of light beam behind the three primary colors.Here, just use the projection-type liquid crystal display device of the permeation type liquid crystal box of the employing three primary colors correspondence that accounts for main flow now, its structure is described with reference to Fig. 6.
Such projection-type liquid crystal display device is typically provided with light-source system, reflection, beam splitting system and enlarging projection system.Adularescent light source 11 and ultraviolet/IR-cut filter 13 in the light-source system, white light L ultraviolet/infrared cutoff filter 13 elimination ultraviolet ray and the infrared rays from white light source are sent to first spectroscope 1.White light source 11 uses metal halide lamp and high-pressure mercury-vapor lamp usually.
Have in reflection, the beam splitting system: four kinds spectroscope 1,2,3,4, two completely reflecting mirrors 5,6, corresponding to separately red light R, green light G and liquid crystal cell 7R, 7G and the 7B of blue light B, light incident side polarization conversion element 8R, 8G and 8B, exiting side polarization conversion element 9R, 9G and 9B and collector lens 10R, 10G and 10B.
First spectroscope 1 only sees through green light G and blue light, and the green light G that will see through and blue light B deliver to second spectroscope 2.Red light R by 1 reflection of first spectroscope is sent to first completely reflecting mirror 5, and collector lens 10R, light incident side polarization conversion element 8R, liquid crystal cell 7R and exiting side polarization conversion element 9R that the back that here is reflected is used by ruddiness are sent to the 3rd spectroscope 3.On the other hand, second spectroscope 2 only sees through blue light B, among the green light G and blue light B after seeing through first spectroscope 1, the blue light B that sees through second spectroscope 2 is sent to second completely reflecting mirror 6 by blue light with collector lens 10B, light incident side polarization conversion element 8B, liquid crystal cell 7B and exiting side polarization conversion element 9B.In addition, be sent to three spectroscope 3 by green glow with collector lens 10G, light incident side polarization conversion element 8G, liquid crystal cell 7G and exiting side polarization conversion element 9G by the green light G after 2 reflections of second spectroscope.The 3rd spectroscope 3 only sees through red light, by the ruddiness of ruddiness with collector lens 10R, light incident side polarization conversion element 8R, liquid crystal cell 7R and exiting side polarization conversion element 9R, sees through the 3rd spectroscope 3 from first completely reflecting mirror 5 without change; In addition, reflect by the 3rd spectroscope 3 by the green light G of green glow, be sent to the 4th spectroscope 4 respectively with collector lens 10G, light incident side polarization conversion element 8G, liquid crystal cell 7G and exiting side polarization conversion element 9G from second spectroscope 2.The 4th spectroscope 4 only by red light R and and green light G, it allows and sees through without change from the red light R of the 3rd spectroscope 3 and green light G, here is reflected from the blue light B of second completely reflecting mirror 6, delivers to projecting lens 16 respectively.
Moreover, show initial beam split red light here, the form of beam split green light then and blue light, but by spectroscopical combination, the order of beam split can at random be changed.
The enlarging projection system comprises projecting lens 16, and it will amplify corresponding to the image of light separately, and intensified image is projected to screen 17.Have again, liquid crystal cell 7R, 7G, light incident side polarization conversion element 8R, 8G, 8B and the outgoing side polarization conversion element 9R of 7B, 9G, 9B corresponding to each coloured light also stick on liquid crystal cell 7R, 7G, the 7B sometimes and use, and usually dispose at intervals with liquid crystal cell 7R, 7G, 7B, this constitutes the air channel of cooling off usefulness at interval.In addition, light incident side polarization conversion element 8R, 8G, 8B and collector lens 10R, 10G, 10B also keep at interval.So, from liquid crystal cell 7R, 7G, 7B and collector lens 10R, 10G, when 10B disposes at intervals, the form that sticks on the linear polarization plate on the reinforcing materials such as glass is used with polarization conversion element 8R, 8G, 8B, 9R, 9G, 9B.
In such projection type liquid crystal display apparatus, each liquid crystal cell 7R, 7G, 7B are configured in respectively between two polarization conversion elements, that is are configured between input side polarization conversion element 8R, 8G, 8B and outgoing side polarization conversion element 9R, 9G, the 9B.These polarization conversion elements 8,9 are because through image being amplified and projecting to upward required light quantity of screen, so thermal value is big.In addition, red light R, green light G and/or blue light B are the occasions of polarized light, when inciding liquid crystal cell 7R, 7G, 7B, often need to make plane of polarisation to produce rotation.Have again, the situation that makes the plane of polarisation rotation is once more also arranged from the polarized light of liquid crystal cell 7R, 7G, 7B outgoing.
In order to make plane of polarisation rotation, can use polarizer, polarizer is configured in projection lens 16 1 sides of light source 11 1 sides of light incident side polarization conversion element 8R, 8G, 8B and outgoing polarization conversion element 9R, 9G, 9B usually.As polarizer, be easy to get calmly and price waits until that factor sets out, used resinous polarizer.This polarizer uses with the form that sticks on the linear polarization plate on light incident side polarization conversion element 8R, 8G, 8B or exiting side polarization conversion element 9R, 9G, 9B.
Such projection-type liquid crystal display device is owing to be subjected to the influence of the birefringence of liquid crystal cell, exist so-called be projected on the screen the not high problem of contrast of image.
Therefore, open in the 2000-137202 communique (patent documentation 1), with optical compensating layer the contrast that distributes in the image surface in the iconic element and the deviation of brightness are relaxed for projection-type liquid crystal display device suggestion the spy.In addition, open in the 2000-352615 communique (patent documentation 2) the spy, suggestion sticks on little on glass of average coefficient of linear expansion absolute value with Polarizer, with its light incident side or exiting side polarization conversion element as projection-type liquid crystal display device; And suggestion on the position of leaving from any Polarizer, is disposed liquid crystal cell optically anisotropic body in addition between light incident side polarization conversion element and exiting side polarization conversion element.These optical compensating layers or optically anisotropic body are used for making discoid liquid crystal hybrid orientation, and for example, adducible is that bulletin is opened product on the flat 8-50206 communique (patent documentation 3) the spy.In these patent documentations 1 and the patent documentation 2 concrete disclosed structures, at liquid crystal cell just, respectively dispose an optical compensating layer or optical anisotropy's body respectively on the both sides, the back side, on the outside separately, respectively dispose a Polarizer again.On the other hand, open in the flat 2002-14345 communique (patent documentation 4) the spy, suggestion is provided with optical compensating layer at the light exit side of liquid crystal cell, carry out optical compensation for the liquid crystal molecule that is present in the light incident side zone in the liquid crystal layer, also the someone proposes the optical compensating layer overlaid that two or three are such.But disclosed optical compensation or optically anisotropic body all exist the easy deterioration of ultraviolet characteristic, the problem of poor reliability in these patent documentations 1, patent documentation 2 and the patent documentation 4.
[patent documentation 1] spy opens the 2000-137202 communique
[patent documentation 2] spy opens the 2000-352615 communique
[patent documentation 3] spy opens flat 8-50206 communique
[patent documentation 4] spy opens the 2002-14345 communique
Summary of the invention
The inventor will develop the contrast that improves projection-type liquid crystal display device, and can realize the optical compensation plate of the high-quality demonstration of long-time continuous, studies.Its result, used transparent membrane with specific penetration characteristic, with it and on the base material diaphragm coated with liquid crystal compound constitute the optical compensation membrane layer and be stacked on the transparency glass plate, by such structure, can improve contrast, keep high quality image for a long time.
Optical compensation plate just of the present invention is laminated by following part: in the transmitance at wavelength 380nm place below 10%, with face that air contacts on, the reflectivity at wavelength 550nm place is the transparent membrane below 2%; The optical compensation diaphragm that the coated with liquid crystal compound constitutes on the base material diaphragm; And transparent glass plate.
This optical compensation plate is used to be assembled in the projection-type liquid crystal display device.Therefore, the present invention also provides the projection-type liquid crystal display device that constitutes at least one side of liquid crystal cell above-mentioned optical compensation plate of configuration.More particularly, be provided with in this projection type liquid crystal display apparatus: white light source; Optical system in order to the dichroic coatings of the primaries that will become red light, green light and blue light from the white light beam split of white light source; Liquid crystal cell; Polarization conversion element; And above-mentioned optical compensation plate.The optical system of this occasion is provided with: for example, and in order to will become the spectroscope of primaries such as red light, green light and blue light, completely reflecting mirror, and collector lens from the white light beam split of white light source.
Description of drawings
Fig. 1 is the diagrammatic cross-section of an expression routine optical compensation plate of the present invention.
Fig. 2 is the diagrammatic cross-section of expression another routine optical compensation plate of the present invention.
Fig. 3 be in the expression optical compensation plate of the present invention with transparent membrane and two optical compensation membrane layers one routine arrangement plan of the shaft angle degree relation when folded.
Fig. 4 be in the expression optical compensation plate of the present invention with transparent membrane and two optical compensation membrane layers another routine arrangement plan of the shaft angle degree relation when folded.
Fig. 5 be in the expression optical compensation plate of the present invention with transparent membrane and two optical compensation membrane layers a routine arrangement plan again of the shaft angle degree relation when folded.
Fig. 6 is the key diagram that the structure example of projection-type liquid crystal display device represented in summary.
To be expression make up the diagrammatic cross-section of the configuration example when being used as projection-type liquid crystal display device with optical compensation plate of the present invention and liquid crystal cell to Fig. 7.
[explanation of symbol]
1,2,3, the 4...... spectroscope,
5, the 6...... completely reflecting mirror,
7,7R, 7G, 7B...... liquid crystal cell,
8,8R, 8G, 8B...... light incident side polarization conversion element,
9,9R, 9G, 9B...... exiting side polarization conversion element,
10R, 10G, 10B...... collector lens,
L...... white light (light source light),
R...... red light,
G...... green light,
B...... blue light,
11...... white light source,
13...... ultraviolet/IR-cut filter,
16...... projection lens,
17...... screen,
20...... optical compensation plate,
21...... transparent membrane,
23...... glass plate,
27...... be arranged on anti-reflection layer on the transparent membrane,
28...... the anti-reflection layer of glass plate side,
30,40...... optical compensation diaphragm,
31, the base material diaphragm of 41...... optical compensation diaphragm,
32, the liquid crystal compounds layer of 42...... optical compensation diaphragm.
Embodiment
Describe the present invention below in detail.In the present invention, used the low transparent membrane of reflectivity of the face that has specific UVA characteristic and contact with air.Transparent membrane used herein is formed from a resin, for example, can be to have the modified polycarbonate of fluorene skeleton and the such polycarbonate series resin of general polycarbonate that obtains from bisphenol-A, the cellulose series resin that diacetyl cellulose and triacetyl cellulose are such, the polysulfones series plastics, the polyethersulfone series plastics, the polyester series resin, the polyimide series plastics, polyamide series resin, polyarylate series plastics etc., the thickness of this transparent membrane is normally about 10～1000 μ m, be preferably in more than the 10 μ m, below the 200 μ m.
And in the present invention, the transmitance that is used in the 380nm place is that transparent membrane below 10% is as such transparent membrane.Use is then better 5% following person in the transmitance at wavelength 380nm place.Such characteristic can for example contain in the diaphragm that the so-called ultraviolet light absorber of benzotriazole system, benzoic ether system, benzophenone series, salicylate system, nickel complex system etc. reaches by making.Contain ultraviolet light absorber in the diaphragm in order to make, can use well-known usual way, adducible example as, ooze in the assorted liquid at the resin that forms diaphragm and to add the method for ultraviolet light absorber system diaphragm, and the solution that will be dissolved with ultraviolet light absorber is coated on the transparent membrane and makes its dry method etc.The content of ultraviolet light absorber preferably for example contains ultraviolet light absorber about 0.01～10 part for the resin of 100 parts of weight.Also can use the commercially available transparent membrane that contains ultraviolet light absorber, the triacetyl cellulose that is added with ultraviolet light absorber (TAC) diaphragm of being sold by Fuji's description film (strain) (useful " UZ " and " TD ", " TDY " constitute the product of the name of an article) (thickness 100 μ m, 80 μ m, 50 μ m, 40 μ m etc.) and the triacetyl cellulose that is added with ultraviolet light absorber (TAC) diaphragm of being sold by Konica (strain) (product that " UX2M " formation name of an article is arranged) (thickness 80 μ m, 57 μ m, 40 μ m etc.) etc. be arranged as the example of the commercially available diaphragm that satisfies such necessary condition.
In addition, this transparent membrane and optical compensation diaphragm described later and glass plate are stacked, make this transparent membrane become the outside surface of a side, and the reflectivity of face at wavelength 550nm place that this transparent membrane is contacted with air becomes below 2%.The desirable value of this reflectivity is preferably in below 0.5% below 1%.Such characteristic can reach with anti-reflection layer is set from the teeth outwards.Anti-reflection layer be reduce with interface that air layer contacts on catoptrical layer, prevent to result from the generation of this catoptrical parasitic light.As anti-reflection layer, common employed material for example can be: the structure of the single or multiple lift that is made of the compound of selecting from metal, metal oxide and metal fluoride.Can be as metal for silver etc., as metal oxide, for example can for: monox, aluminium oxide, titanium dioxide, tantalum oxide, yttria, zirconia etc. in addition, for example can be magnesium fluoride etc. as metal fluoride.This anti-reflection layer can be an individual layer, also can be 2 layers, 3 layers, the multilayer more than 4 layers.The thickness of each layer the when thickness of anti-reflection layer and multilayer can wait suitably according to its number of plies, the refractive index that is used for the material of each layer and select.In addition, for improving the stickability of antireflection diaphragm and transparent membrane, propylene overlay and hard overlay can be set between them also.
On the surface that anti-reflection layer is arranged on the transparent membrane, contact angle is best more than 80 °, and is then better more than 100 °.Here so-called contact angle, the value when being to use this liquid of water.With face that air contacts on contact angle during less than 80 ° because particulate adheres to easily, used the projection-type liquid crystal display device of optical compensation plate with this surface, under long-term situation about using continuously, the tendency that has contrast to descend easily.The upper limit of contact angle is 180 °.
When the contact angle of regulation is here satisfied on the surface of anti-reflection layer, the transparent membrane with such anti-reflection layer intactly can be used for the present invention, for example, can use " HT-ARPSMC " of " letterpress (strain) " corporate system etc.In addition, in the many occasions of common anti-reflection layer,, at this moment can realize above-mentioned contact angle by the layer that fluoride constitutes here by setting on anti-reflection layer owing to the contact angle of not stipulating.The layer that is made of fluoride can be coated on the surface by the coating liquid that will contain this compound and is provided with.For this reason, if the fluorine compounds of use can be accomplished the contact angle on surface more than 80 °, not specially provided for then; For preventing the normally used material of pollution on surface, for example can be the material of fluorine containing silane compound etc.Because can prevent adhering to of dirt such as fingerprint from the teeth outwards, such fluoride is widely used in fields such as coating all the time.
In the present invention, will have the transparent membrane of specific like this optical transmittance and specific surface reflectivity and specific optical compensation diaphragm is used in combination.This optical compensation diaphragm is a coated with liquid crystal compound on the base material membrane surface, and its orientation back is formed, and this diaphragm compensates the optical phase difference that the liquid crystal molecule in the liquid crystal cell produces after being assembled on the projection-type liquid crystal display device.
Base material diaphragm as the optical compensation diaphragm, for example have: have the modified polycarbonate of fluorene skeleton and the such polycarbonate series resin of general polycarbonate that obtains by bis-phenol, the cellulose series resin that diacetyl cellulose and triacetyl cellulose are such, as norborene is the cyclopolyolefin series plastics of polymer of monomers, polysulfones series plastics, polyethersulfone series plastics, the polyester series plastics, the polyimide series plastics, polyamide series resin, polyarylate series plastics etc.The thickness of this base material diaphragm is normally about 10～1000 μ m.Be coated in liquid crystal compounds above it and can be the discoid liquid-crystal compounds that for example has the benzophenanthrene skeleton and high molecule liquid crystal compound etc.Making the method for liquid crystal compounds orientation can be usual way, for example, can adopt the base material membrane surface is carried out orientation process in advance, coated with liquid crystal compound on it, after making its drying, make the fixing method of the orientation of liquid crystal compounds etc. with thermal treatment.Optical compensation diaphragm behind such coated with orientation liquid crystal compounds is for example put down in writing to some extent at aforementioned patent document 3.For example have as the commercially available optical compensation diaphragm behind the coated with orientation liquid crystal compounds: " day stone LC diaphragm " that " wide visual field diaphragm " (being also referred to as " WV diaphragm " sometimes) (kind: WV A 03B, WV A 12B, WV A 038, WV A 128) that description diaphragm (strain) company of Fuji sells and company of Nippon Mitsubishi Oil's (strain) sell reaches " day stone NH diaphragm ", " day stone NR diaphragm " etc.
In the present invention, the transparent membrane of top explanation and optical compensation diaphragm are sticked on the transparent glass plate make optical compensation plate.As transparency glass plate, can use the common silicon that is referred to as backboard glass and blank glass is glass plate, quartz glass etc.In addition, it also is suitable using high sapphire glass and the crystal glass of pyroconductivity.Sapphire glass is aluminium oxide (AI
2O
3) monocrystal, for example, use to form tabular goods by EFG method (EdGe-defined Film-fedGrowth method).Crystal glass is SiO
2Monocrystal, can be synthetic quartzy, also can be mineral crystal.The face that is preferably in a side of transparency glass plate promptly exposes face and is provided with anti-reflection layer.The thickness of transparency glass plate normally about 0.1～2mm, it is desirable to more than the 0.3mm, and better is below 0.8mm.The area of transparency glass plate can suitably be selected according to the size as the projection-type liquid crystal display device of productive target.It is rectangle or the square of 10～100mm that representational example has the length of side, the circle of diameter 5～100mm or ellipse etc.
Stacked transparent membrane and optical compensation diaphragm on such transparency glass plate.At this moment, transparent membrane is formed on the outside surface of a side, come stacked with the order of transparency glass plate/optical compensation diaphragm/transparent membrane usually.The area of transparent membrane and optical compensation diaphragm is roughly the same or slightly littler than glass plate with the area of transparency glass plate usually.Area is slightly little also to stick on the glass easily, preferably reduces the area of transparent membrane and optical compensation diaphragm, so that it sticks on the inboard apart from about clear glass panel edges 0.5～5mm.
Transparent membrane and optical compensation diaphragm and glass plate and optical compensation diaphragm come stacked by adhesive layer usually.As the cementing agent that constitutes adhesive layer, use for example propylene series pressure-sensitive type cementing agent, the pressure-sensitive type cementing agent of urethanes series pressure-sensitive type cementing agent etc.Pressure-sensitive type cementing agent generally provides the adhesive layer of each homogeny on the transparent optics.In addition, pressure-sensitive type cementing agent is referred to as cementing agent.The thickness of adhesive layer is usually about 10～60 μ m.
In optical compensation plate of the present invention, that two optical compensation plates that applied liquid crystal compounds on base material diaphragm ground that adjoins each other is stacked just desirable more.Just two optical compensation diaphragms are positioned on the face of glass plate one side, if arranged in order with the transparent membrane/first optical compensation diaphragm/second optical compensation diaphragm that anti-reflection layer is arranged, make the anti-reflection layer of transparent membrane be in outermost, then the raising effect of contrast can be higher.At this moment, the best approximate vertical of two optical compensation diaphragms axis of orientation separately disposes crossingly, in addition, so-called here " approximate vertical intersects " preferably intersect vertically (90 °), ± 5 ° of interior deviations of scope allow.Also has same meaning " roughly " of using when in the other parts of this instructions, relating to angle configurations.Have again, among two optical compensation diaphragms, the first optical compensation diaphragm of close transparent membrane is when being assembled into projection-type liquid crystal display device, and its axis of orientation preferably and the absorption axes approximate vertical of the linear polarization plate in the polarization conversion element of disposed adjacent intersects or the configuration of almost parallel ground.In addition, preferably configuration like this of these two optical compensation diaphragms: the face that makes offside is base material diaphragm side and the face overlaid that scribbles liquid crystal compounds.
Fig. 1 and Fig. 2 show the example of optical compensation plate of the present invention.The example that is shown in Fig. 1 is that transparent membrane 21 is stacked with optical compensation diaphragm 30, pastes on the glass plate 23 and forms optical compensation plate 20 in optical compensation diaphragm 30 1 sides.Here, optical compensation diaphragm 30 is that coated with liquid crystal type compound layer 32 also is orientated back formation on base material diaphragm 31, and its liquid crystal compounds layer 32 1 sides paste on the transparent membrane 21, and its base material diaphragm 31 1 examples paste on the glass plate 23.On transparent membrane and one side that air contacts, be provided with anti-reflection layer 27.In addition, on the outside surface of the opposite side of the stickup face with optical compensation diaphragm 30 of glass plate 23, be provided with anti-reflection layer 28.Have at glass plate 23 under optical anisotropy's the situation, be necessary to make its crystallographic axis parallel with the polarizing axis of the polarized light that sees through or intersect vertically, for example, when glass plate 23 was sapphire glass, the polarizing axis of the C axle of sapphire glass and the polarized light that sees through is configured to almost parallel or approximate vertical intersects.
The example that is shown in Fig. 2 is: on the structural basis of layer of Fig. 1, increase the configuration second optical compensation diaphragm 40 between optical compensation diaphragm 30 and glass plate 23, as the structure of optical compensation plate 20.Therefore, will be configured in the optical compensation diaphragm 30 of transparent membrane 21 sides as the first optical compensation diaphragm.The second optical compensation diaphragm 40 is coated with orientation liquid crystal compounds layer 42 and forming on base material diaphragm 41 also.In example shown in Figure 2, two optical compensation diaphragms 30,40 are configured to make axis of orientation approximate vertical separately to intersect.These two optical compensation diaphragms are that base material diaphragm 31,41 sides dispose with coinciding at the reverse side of liquid crystal compounds layer 32,42 applicator surface.
In Fig. 3～Fig. 5, fold under the situation of optical compensation diaphragm 30,40 as shown in Figure 2 layer by layer with regard to 2, the relation of the shaft angle degree of two optical compensation diaphragms 30,40 is shown.All be a side that is illustrated in transparent membrane 21, with two optical compensation diaphragms, that is the relation of the first optical compensation diaphragm 30 and the second optical compensation diaphragm 40 shaft angle degree when stacked in this order.No matter under which kind of situation, the axis of orientation of the axis of orientation of the first optical compensation diaphragm 30 and the second optical compensation diaphragm 40 all is configured to approximate vertical and intersects.Just be taken as 0 ° if incite somebody to action the right on the long limit of optical compensation diaphragm 30,40 separately, then in Fig. 3, the axis of orientation of the first optical compensation diaphragm 30 is taken as 135 ° direction, the axis of orientation of the second optical compensation diaphragm 40 is taken as 225 ° direction, in Fig. 4 and Fig. 5, the axis of orientation of the first optical compensation diaphragm 30 is taken as 270 ° of directions, and the axis of orientation of the second optical compensation diaphragm 40 is taken as 180 ° of directions or 0 ° of direction.Moreover, in Fig. 4 and Fig. 5, represent that the direction of arrow of axis of orientation of the second optical compensation diaphragm 40 is opposite, the direction of this arrow means the frictional direction of orientation.
Optical compensation plate of the present invention is applicable to projection-type liquid crystal display device.For example, in projection-type liquid crystal display device, can be inserted in the light path from the white light of white light source, or use in the light path as each primitive color light of the red light after the white light beam split, green light or blue light.
Specifically, in projection-type liquid crystal display device shown in Figure 6, configurable corresponding to each between trichromatic liquid crystal cell 7R, 7G, 7B and light incident side polarization conversion element 8R, 8G, the 8B, or use between exiting side polarization conversion element 9R, 9G, 9B and liquid crystal cell 7R, 7G, the 7B.It is just more effective that whole intervals between the whole intervals between light incident side polarization conversion element 8R, 8G, 8B and liquid crystal cell 7R, 7G, the 7B or exiting side polarization conversion element 9R, 9G, 9B and liquid crystal cell 7R, 7G, 7B dispose optical compensation plate of the present invention.This optical compensation plate is configured to make the glass plate 23 of Figure 1 and Figure 2 to be in polarization conversion element 8R, 8G, 8B or 9R, 9G, 9B one side usually, and in other words, transparent membrane 21 is configured in the side than glass plate 23 more close liquid crystal cell 7R, 7G, 7B.
Configuration example in such projection-type liquid crystal display device is shown in Fig. 7 with diagrammatic cross-section.Fig. 7 (A) is configured in example between the polarization conversion element 8 or 9 of liquid crystal cell 7 and light incident side or exiting side with optical compensation plate shown in Figure 1 20, in addition, Fig. 7 (B) is configured in example between the polarization conversion element 8 or 9 of liquid crystal cell 7 and light incident side or exiting side with optical compensation plate shown in Figure 2 20.No matter any situation, the transparent membrane 21 that constitutes optical compensation plate 20 all is configured in liquid crystal cell one side. and glass plate 23 is configured in a side of polarization conversion element 8 or 9.(diagram omit) in addition, with the glass of the opposite side of face of the optical compensation diaphragm 30 of pasting optical compensation plate or 40 on, also can paste polarization conversion element 8 or 9.Moreover, with the face of the opposite side of face of the optical compensation diaphragm 30 of pasting optical compensation plate or 40 on also can directly paste Polarizer and be used as polarization conversion element, at this moment not only components number reduces, cost reduces, also air-supply easily improves cooling effectiveness.Also have in addition; particularly for the polarization conversion element of exiting side; also can be configured in the purpose of Polarizer there for protection; the Polarizer that transmitance is high (pre-Polarizer) sticks on the glass-board surface relative with the face of the optical compensation diaphragm 30 that is pasted with optical compensation plate or 40; paste common Polarizer (main Polarizer) in its outside; make its see through axle and previous pre-Polarizer to see through axle one-tenth parallel, as polarization conversion element.At this moment, because light has absorption to a certain degree on the high Polarizer of transmitance (pre-Polarizer), can make the absorption of the light on the main Polarizer that is configured in its back soft.As the high Polarizer of transmitance that uses with such purpose, " STX8C2A-HC-AR ", " STX8B2A=HC-AR " that Sumitomo Chemical (strain) company sells, " STX8A2A-HC-OB " etc. are arranged.
On the other hand, the projection-type liquid crystal display device that also useful veneer form will directly be amplified from the beam split light beam of color filter, and in this case in the light path of white light, is containing configuration optical compensation plate of the present invention before or after the liquid crystal cell of color filter.
[embodiment]
Illustrate in greater detail the present invention with concrete example below, the present invention is not subjected to the qualification of these examples.
Cooperate ultraviolet light absorber, the transmitance at wavelength 380nm place is 2.4%, in addition, imposes the antireflection processing on single face, will be that 0.5% tri acetyl cellulose membrane sheet is as transparent membrane at the surface reflectivity at wavelength 550nm place.With the face of the opposite side of its antireflection treated side on, be the optical compensation diaphragm of coated with orientation liquid crystal compounds on the base material diaphragm, " wide visual field diaphragm WV A 03B " that two description film (strain) companies of Fuji sell is stacked by cementing agent respectively.At this moment, two optical compensation diaphragms dispose with shaft angle degree same as shown in Figure 5, and become to fit Face to face with the base material film of the face opposition side that forms each liquid crystal compounds layer is unilateral.Impose the antireflection processing on the single face of the sapphire glass plate of the Diagonal Dimension 0.9 inch (about 23mm) of selling by capital セ ラ (strain) company again, on the face of an opposite side with it, the duplexer of the above-mentioned transparent membrane/first optical compensation diaphragm/second optical compensation diaphragm is bonding in liquid crystal compounds one side of the second optical compensation diaphragm, make the optical compensation plate of structure shown in Figure 2.At this moment, the C axle of the axis of orientation of the second optical compensation diaphragm 40 and sapphire 23 is as one man fitted.
If each liquid crystal cell of red (R) of projection-type liquid crystal display device, green (G) and blue (B) and setting between each exiting side polarization conversion element are set by the optical compensation plate that obtains above, make this glass plate be in polarization conversion element one side, then the contrast on the screen improves, and can keep the high display quality of long-time continuous.
Comparative example 1
Except not using the transparent membrane this point, all the other and embodiment 1 make optical compensation plate identically.This optical compensation plate is arranged in the projection-type liquid crystal display device similarly to Example 1, and then the contrast on the screen improves, if but long-time the use, then display quality can descend.
[effect of invention]
Optical compensation plate of the present invention is to have specific transparent membrane and the light of anti-reflection layer Learn the optical compensation plate of compensating diaphragm after with specific arranged in order, be effectively used to projection The type liquid crystal indicator, the projection type liquid crystal display apparatus that has disposed this optical compensation plate improves The contrast of institute's projects images, and long-time continuous is kept high-quality demonstration.
Claims (8)
1. optical compensation plate, it is characterized in that: it by in wavelength 380nm place transmitance be below 10%, with face that air contacts on the reflectivity at wavelength 550nm place be transparent membrane below 2%, the optical compensation diaphragm that the coated with liquid crystal compound forms on the base material diaphragm, and transparency glass plate is laminated.
2. optical compensation plate as claimed in claim 1 is characterized in that: it forms by the optical compensation membrane layer that has applied liquid crystal compounds on two its base material diaphragms is folded.
3. optical compensation plate as claimed in claim 2 is characterized in that: two optical compensation diaphragms, axis of orientation approximate vertical separately disposes crossingly.
4. optical compensation plate as claimed in claim 2 is characterized in that: form the unilateral mutual applying of its base material film relative with the liquid crystal compounds applicator surface by two optical compensation membrane layers are folded.
5. optical compensation plate as claimed in claim 3 is characterized in that: form the unilateral mutual applying of its base material film relative with the liquid crystal compounds applicator surface by two optical compensation membrane layers are folded.
6. as each described optical compensation plate in the claim 1～5, it is characterized in that: transparency glass plate is a sapphire glass.
7. a projection-type liquid crystal display device is characterized in that: a side that is configured in liquid crystal cell as each described optical compensation plate in the claim 1～5.
8. projection-type liquid crystal display device, it is characterized in that: optical compensation plate as claimed in claim 6 is configured in a side of liquid crystal cell.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP371741/02 | 2002-12-24 | ||
| JP2002371741 | 2002-12-24 | ||
| JP371741/2002 | 2002-12-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1510442A CN1510442A (en) | 2004-07-07 |
| CN100367050C true CN100367050C (en) | 2008-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200310122073XA Expired - Fee Related CN100367050C (en) | 2002-12-24 | 2003-12-22 | Optical compensating board and projecting liquid crystal dispaying device therewith |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007256898A (en) | 2006-02-24 | 2007-10-04 | Seiko Epson Corp | Optical element and method for manufacturing same |
| JP5104373B2 (en) * | 2008-02-14 | 2012-12-19 | 日本ゼオン株式会社 | Production method of retardation plate |
| US8703365B2 (en) * | 2012-03-06 | 2014-04-22 | Apple Inc. | UV mask with anti-reflection coating and UV absorption material |
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|---|---|---|---|---|
| US5196953A (en) * | 1991-11-01 | 1993-03-23 | Rockwell International Corporation | Compensator for liquid crystal display, having two types of layers with different refractive indices alternating |
| JPH07140326A (en) * | 1993-11-17 | 1995-06-02 | Nippon Oil Co Ltd | Compensation plate for liquid crystal display element |
| US5583679A (en) * | 1994-05-31 | 1996-12-10 | Fuji Photo Film Co., Ltd. | Liquid crystal display with optical compensatory sheet having discotic molecules varyingly inclined |
| EP0911656A2 (en) * | 1997-10-20 | 1999-04-28 | Fuji Photo Film Co., Ltd. | Optical compensatory sheet and liquid crystal display |
| JP2000137202A (en) * | 1998-10-30 | 2000-05-16 | Seiko Epson Corp | Projection type display device |
| JP2000352615A (en) * | 1999-06-11 | 2000-12-19 | Seiko Epson Corp | Polarizing plate with glass and liquid crystal projector |
| US20020018162A1 (en) * | 2000-05-31 | 2002-02-14 | Yoshio Suzuki | Apparatus and method for displaying image |
| CN1340723A (en) * | 2000-07-21 | 2002-03-20 | 柯尼卡株式会社 | Optical compensation film, polarized film for the said compensation film and liquid crystal display device |
-
2003
- 2003-12-22 CN CNB200310122073XA patent/CN100367050C/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5196953A (en) * | 1991-11-01 | 1993-03-23 | Rockwell International Corporation | Compensator for liquid crystal display, having two types of layers with different refractive indices alternating |
| JPH07140326A (en) * | 1993-11-17 | 1995-06-02 | Nippon Oil Co Ltd | Compensation plate for liquid crystal display element |
| US5583679A (en) * | 1994-05-31 | 1996-12-10 | Fuji Photo Film Co., Ltd. | Liquid crystal display with optical compensatory sheet having discotic molecules varyingly inclined |
| EP0911656A2 (en) * | 1997-10-20 | 1999-04-28 | Fuji Photo Film Co., Ltd. | Optical compensatory sheet and liquid crystal display |
| JP2000137202A (en) * | 1998-10-30 | 2000-05-16 | Seiko Epson Corp | Projection type display device |
| JP2000352615A (en) * | 1999-06-11 | 2000-12-19 | Seiko Epson Corp | Polarizing plate with glass and liquid crystal projector |
| US20020018162A1 (en) * | 2000-05-31 | 2002-02-14 | Yoshio Suzuki | Apparatus and method for displaying image |
| CN1340723A (en) * | 2000-07-21 | 2002-03-20 | 柯尼卡株式会社 | Optical compensation film, polarized film for the said compensation film and liquid crystal display device |
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| Publication number | Publication date |
|---|---|
| CN1510442A (en) | 2004-07-07 |
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