CN101211057A

CN101211057A - LCD device

Info

Publication number: CN101211057A
Application number: CNA2006101683398A
Authority: CN
Inventors: 李光荣; 郑闵玮
Original assignee: LITE PHOTOELECTRIC SCIENCE AND TECHNOLOGY Co Ltd
Current assignee: LITE PHOTOELECTRIC SCIENCE AND TECHNOLOGY Co Ltd; Optimax Technology Corp
Priority date: 2006-12-26
Filing date: 2006-12-26
Publication date: 2008-07-02

Abstract

A liquid crystal display comprises a backlight module, a liquid crystal panel unit, a first polarizer and a second polarizer; wherein the liquid crystal panel unit is arranged above a light-out surface of the backlight module, the first polarizer is arranged between the backlight module and the liquid crystal panel unit, and the second polarizer is, compared with the first polarizer, arranged at the other side of the liquid crystal panel unit. Moreover, the first polarizer comprises a first polarizing layer, a first optical film and a second optical film; wherein the first optical is arranged at one side of the first polarizing layer, and the second optical film is, compared with the first optical film, arranged at the other side of the first polarizing layer. In addition, the second optical film is a polymethyl methacrylate optical film; compared with the first optical film, the second optical film is closer to the liquid crystal panel unit.

Description

LCD

Technical field

The present invention relates to a kind of LCD, particularly a kind of LCD of blooming, and this blooming is a polymethylmethacrylate blooming.

Background technology

See also Fig. 1, Fig. 1 is the structural representation of at present general on the market LCD.LCD 100 comprises: backlight module 110, Polarizer 120, liquid crystal panel unit 130 and colored filter 140.Wherein, backlight module 110 is to be used to provide light source, and Polarizer 120 then is top and the below that is disposed at liquid crystal panel unit 130.

See also Fig. 2, Fig. 2 is the structural representation of existing Polarizer.In general, Polarizer 120 mainly is by two layers of TAC (Triacetyl-cellulose; Triacetate fiber) film 124 and one deck PVA (Polyvinylalcohol; Polyvinyl alcohol (PVA)) film 122 constitutes, and wherein PVA film 122 is to be clipped in 124 of two-layer TAC films, and PVA film 122 is as the polar biased material, and TAC film 124 then is used for protection and supports PVA film 122.

Traditionally, TAC film 124 has phasic difference value (Re retardation value in the less face; Be designated hereinafter simply as the Re value), however outer phasic difference value (the Rth retardation value of higher face is but arranged; Hereinafter to be referred as the Rth value), higher Rth value can cause LCD (especially IPS LCD) to produce relatively poor optical compensation, for example can produce lower contrast or colo(u)r bias (color shift) when the visual angle that tilts.Therefore, the Rth value with TAC film 124 reduces to have become the important problem in this area as far as possible.

In patent documentation JP1998330538, JP1999246704, JP2001206981, JP2006010863, disclose special solvents such as N-Propyl Bromide, glyceride have been made an addition in the TAC film, or utilized the carboxyl solvent treatment method, to reduce the Rth value of TAC film.Yet the processing procedure that above-mentioned patent documentation is mentioned Rth value comparatively complicated and resulting TAC film also can't level off to zero.

In addition, in patent documentation JP1999005851, JP2001129927, JP2001163995, JP2005097621, chemical constitution by revising the TAC film is then disclosed to obtain the TAC film of low Rth value.Yet its shortcoming is: manufacture process is comparatively complicated and can't obtain Rth value and level off to zero TAC film.

In recent years, people such as Koike (Science, 301,812,2003) had proposed a kind of free of birefringence polymkeric substance (zero-birefringence polymers) with mineral crystal.Yet, because the transverse plane (in-plane plane) that polymer chain tends at described polymer film stretches, so the reduction of the Rth value of polymer film that will described polymkeric substance is made is quite difficult.

In addition, people such as Nakayama (IDW 05 FMC 11-2) have proposed a kind of FUJI of being called as FILM, the low phase delay TAC film of Z-TAC.This TAC film is by use adjuvant and specific manufacturing technology, and makes the Re value of described TAC film and Rth value all level off to zero.Yet above-mentioned adjuvant can make material cost increase, and allows the thermal stability of TAC film descend.

TAC film traditionally also has problems such as water absorptivity and moisture-penetrability are big except the Rth value is higher.Therefore, when using under high temperature, high humidity, the TAC film can cause deformation of thin membrane or produce stress because of external environment, and causes optical characteristics to be affected, even causes the situation that can't use.

Because traditional TAC film has above-mentioned problem, therefore use its display quality of LCD of described TAC film also can be relatively poor.In view of the above problems, the inventor of this case proposes a kind of LCD then, and this LCD comprises at least a Polarizer, and this Polarizer has the polymethylmethacrylate blooming.Wherein, with respect to TAC film traditionally, this blooming has lower Rth value, and has more moderate water absorptivity and drenched property.

Summary of the invention

The purpose of this invention is to provide a kind of LCD, this LCD comprises at least a Polarizer, and described Polarizer has the polymethylmethacrylate blooming, and this Polarizer can make described LCD that good display quality is arranged.

According to above-mentioned purpose and other purpose, the invention provides a kind of LCD, LCD comprises: backlight module, liquid crystal panel unit, first Polarizer and second Polarizer.Wherein, liquid crystal panel unit is disposed at the exiting surface top of backlight module, and first Polarizer is disposed between backlight module and liquid crystal panel unit, and second Polarizer is disposed at an other side of described liquid crystal panel unit with respect to first Polarizer.And first Polarizer comprises: first polarizing layer, first blooming and second blooming, and wherein first blooming is disposed at a wherein side of first polarizing layer, and second blooming is disposed at an other side of first polarizing layer with respect to first blooming.In addition, second blooming is a polymethylmethacrylate blooming, and second blooming is compared to the more close liquid crystal panel unit of first blooming.

In above-mentioned LCD, the polymethylmethacrylate blooming comprises: arbitrary material of selecting the cohort formed from PMMA, the PMMA that is substituted the functional group and PMMA blending; And solvent.Wherein, select arbitrary material of the cohort formed from PMMA, the PMMA that is substituted the functional group and PMMA blending, evenly be blended in the described solvent with arbitrary proportion according to the required character of described polymethylmethacrylate blooming.

In the polymethylmethacrylate blooming, arbitrary material of selecting the cohort formed from PMMA, the PMMA that is substituted the functional group and PMMA blending is in described solvent with 20% to 40% number percent blending.

In the polymethylmethacrylate blooming, the functional group that is substituted who is substituted functional group's PMMA is methyl, and it is a methyl of selecting to replace with ethyl, propyl group, isopropyl, normal-butyl, isobutyl, new butyl, n-hexyl, isohesyl, cyclohexyl or several aforesaid functional groups PMMA.

In the polymethylmethacrylate blooming, solvent is arbitrary solvent of selecting in toluene, acetone, methyl acetate, aromatic series, naphthenic, ethers, ester class and the ketone.Wherein, aromatic series is to select toluene, ortho-xylene (Xylene) ,-arbitrary kenel in dimethylbenzene and the right-dimethylbenzene; Naphthenic comprises cyclohexane; Ethers is arbitrary ethers of selecting in Anaesthetie Ether and the tetrahydrofuran; The ester class is arbitrary ester class of selecting in methyl acetate and the ethyl acetate; And ketone is arbitrary ketone of selecting in acetone, methyl ethyl ketone and the 1-methyl-cyclopentanone.

In the polymethylmethacrylate blooming, further add a plurality of particles, these particles coat to be selected arbitrary material of the cohort formed from PMMA, the PMMA that is substituted the functional group and PMMA blending and are formed by a caoutchouc elasticity material.

In the polymethylmethacrylate blooming, the caoutchouc elasticity material is the group that selection is made up of butyl acrylate, polymethylmethacrylate, styrene.In addition, the addition of particle is 2.5% to 50%.

In the polymethylmethacrylate blooming, further add tripoli, and the addition of tripoli is 0.5% to 15% of a blooming weight.

In above-mentioned LCD, polarizing layer mainly is made of polyvinyl alcohol (PVA).

In above-mentioned LCD, the main material of first blooming for example is: triacetate fiber, polycarbonate (Polycarbonate) or poly-cycloolefin (Cyclic olefin polymer).

Certainly, the first above-mentioned blooming also can be by one group of high molecular polymer that cooperatively interacts, and first blooming has identical formation with above-mentioned polymethylmethacrylate blooming.

In above-mentioned LCD, second Polarizer for example comprises: second polarizing layer, the 3rd blooming and the 4th blooming.Wherein, the 3rd blooming is disposed at a wherein side of second polarizing layer, and its main material for example is: triacetate fiber, polycarbonate or poly-cycloolefin.In addition, the 4th blooming be disposed at an other side of second polarizing layer, and the main material of the 4th blooming for example is: triacetate fiber, polycarbonate or poly-cycloolefin with respect to the 3rd blooming.

In addition, above-mentioned the 4th blooming also can be with above-mentioned polymethylmethacrylate blooming and has identical formation.

In addition, above-mentioned the 3rd blooming also can be with above-mentioned polymethylmethacrylate blooming and has identical formation.

LCD of the present invention, because its Polarizer has the polymethylmethacrylate blooming, and this polymethylmethacrylate blooming has lower Rth value and more moderate water absorptivity and drenched property with respect to the TAC film, so use the LCD of this polymethylmethacrylate blooming to have good display quality.

In above-mentioned LCD, liquid crystal panel unit is the liquid crystal panel unit of horizontal suitching type (In-Plane Switching is commonly called as IPS).

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, hereinafter will and cooperate appended diagram with embodiment, be described in detail below.

Description of drawings

Fig. 1 illustrate is the structural representation of at present general on the market LCD;

Fig. 2 illustrate is the structural representation of existing Polarizer;

Fig. 3 illustrate is the structural representation of the LCD of preferred embodiment of the present invention;

Fig. 4 A illustrate is the structural representation of first Polarizer of Fig. 3;

Fig. 4 B illustrate is the structural representation of second Polarizer of Fig. 3;

Fig. 5 A is respectively the colour cast figure of existing LCD in color state, bright attitude, dark attitude from left to right;

Fig. 5 B is respectively the LCD of preferred embodiment from left to right in the colour cast figure of color state, bright attitude, dark attitude;

Fig. 6 is the structural representation of second Polarizer of another preferred embodiment;

Fig. 7 A is respectively the colour cast figure of existing LCD in color state, bright attitude, dark attitude from left to right;

Fig. 7 B is respectively the LCD of another preferred embodiment from left to right in the colour cast figure of color state, bright attitude, dark attitude.

Description of reference numerals: 100-LCD; 110-mould backlight; The 120-Polarizer; The 122-PVA film; The 124-TAC film; The 130-liquid crystal panel unit; The 140-colored filter; The 200-LCD; The 210-backlight module; The 212-reflex housing; The 214-light emitting source; The 216-light guide plate; 220-first Polarizer; 222-first blooming; 224-first polarizing layer; 226-second blooming; The 230-liquid crystal panel unit; The 240-colored filter; 260,260 '-the second Polarizer; 262,262 '-Di, three bloomings; 264-second polarizing layer; 266-the 4th blooming.

Embodiment

At this, the present invention will be described in detail some preferred embodiments.Yet, it should be noted that except these clear and definite narrations, the present invention can be embodied among other embodiment of a broad range, and scope of the present invention not being subject to following preferred embodiment, it is when deciding on claim.

See also Fig. 3, Fig. 3 illustrate is the structural representation of the LCD of preferred embodiment of the present invention.LCD 200 comprises: backlight module 210, first Polarizer 220, liquid crystal panel unit 230, colored filter 240 and second Polarizer 260.Wherein, backlight module 210 is to be used to provide light source, and first Polarizer 220 then is the below that is disposed at liquid crystal panel unit 230, and light can be by polarization after passing first Polarizer 220, and the light of polarization can pass the liquid crystal molecule of liquid crystal panel unit 230.Because the arrangement mode of liquid crystal molecule is influenced by the voltage that the electrode in the liquid crystal panel unit 230 (not illustrating) produces, so liquid crystal molecule can change the polarizing angle of polarization light.The light of different polarizing angles will produce the coloured light of different colours and different brightness after via the colored filter 240 and second Polarizer 260.At last, just can form the various images that naked eyes are seen via the combination of each coloured light again.

Wherein, backlight module 210 comprises: reflex housing 212, light emitting source 214, light guide plate 216.Light emitting source 214 (for example: the light that is sent cathode fluorescent tube), after the guiding via the reflection of reflex housing 212 and light guide plate 216, and penetrate toward the direction of liquid crystal panel unit 230.In this preferred embodiment, backlight module 210 is a direct type backlight module, but backlight module 210 also can change the backlight module of side incident type backlight module or other form into.

Liquid crystal panel unit 230 is the liquid crystal panel unit that laterally switches (In-Plane Switching is commonly called as IPS) formula.Certainly, liquid crystal panel unit 230 also can be other form, for example is multiregional vertical align (Multi-Vertical Alignment is commonly called as MVA) formula.

Then, please consult Fig. 3 and Fig. 4 A simultaneously, Fig. 4 A is the structural representation of first Polarizer of Fig. 3.First Polarizer 220 comprises: first blooming 222, first polarizing layer 224 and second blooming 226, wherein when first Polarizer 220 is combined in the LCD 200, second blooming 226 is to be positioned at 224 of liquid crystal panel unit 230 and first polarizing layers, and first blooming 222 then is to be configured in first polarizing layer, 224 belows.Wherein, first blooming 222 and second blooming 226 have protection and the effect that supports first polarizing layer 224.Wherein, second blooming 226 is a polymethylmethacrylate blooming.In this preferred embodiment, first blooming 222 mainly is made of triacetate fiber.In addition, first polarizing layer 224 passes through the light with specific polar biased direction as the polar biased material, and first polarizing layer 224 mainly is made of polyvinyl alcohol (PVA).

Come, please consult Fig. 3 and Fig. 4 B simultaneously, Fig. 4 B is the structural representation of second Polarizer of Fig. 3.Second Polarizer 260 comprises: one the 3rd blooming 262, one the 4th blooming 266 and one second polarizing layer 264.Wherein, the 3rd blooming 262 is disposed at a wherein side of second polarizing layer 264, and the 4th blooming 266 is disposed at an other side of second polarizing layer 264.The 3rd blooming 262 and the 4th blooming 266 have protection and the function that supports second polarizing layer 264; in this preferred embodiment; the 3rd blooming 262 and the 4th blooming 266 mainly are made of triacetate fiber, and second polarizing layer 264 mainly is made of polyvinyl alcohol (PVA).

Above-mentioned polymethylmethacrylate blooming comprises: arbitrary material of selecting the cohort formed from PMMA, the PMMA that is substituted the functional group and PMMA blending; An and solvent.Wherein, arbitrary material of the cohort formed in a kind of PMMA, the PMMA that is substituted the functional group and PMMA blending of above-mentioned selection can evenly be blended in the above-mentioned solvent with arbitrary proportion according to the required character of polymethylmethacrylate blooming.Under the preferable situation, the solid content of the PMMA of arbitrary material in solution of the cohort that selection is formed in a kind of PMMA, the PMMA that is substituted the functional group and PMMA blending is between 20% to 40%.

The functional group that is substituted of the above-mentioned functional group's of being substituted PMMA is methyl, and it is to select with functional group's substituent methyls such as ethyl, propyl group, isopropyl, normal-butyl, isobutyl, new butyl, n-hexyl, isohesyl, cyclohexyl.In addition, above-mentioned PMMA blending is the blending that comprises at least a macromolecule, micromolecule, plasticizer (plasticizer), UV absorbing agent, antidegradant or nanometer particle.In addition, above-mentioned solvent comprises at least a aromatic series, naphthenic, ethers, ester class, ketone or its potpourri.And, above-mentioned aromatic series comprises toluene, ortho-xylene (Xylene) ,-dimethylbenzene or right-dimethylbenzene, naphthenic comprises cyclohexane (Cyclohexane), ethers comprises Anaesthetie Ether (Diehtyl Ether), tetrahydrofuran (Tetrahydrofuran:THF), the ester class comprises methyl acetate (Methyl acetate), ethyl acetate (Ethyl acetate), and ketone comprises acetone (Acetone), methyl ethyl ketone (methylethylketone:MEK), 1-methyl-cyclopentanone (1-methylpyrrolidone:NMP).Above-mentioned solvent is selected a just embodiment, is not in order to limit the present invention.

The particle diameter of above-mentioned nanometer particle is to be less than or equal to 100 nanometers, and preferable situation is less than 80 nanometers, is more preferably less than 50 nanometers.In addition, described polymethylmethacrylate blooming can further add tripoli (silica), and the addition of this tripoli can be 0.5% to 15% of blooming weight.

In the aforesaid polymethylmethacrylate blooming, can further add a plurality of particles, these particles coat to be selected arbitrary material of the cohort formed and are formed in PMMA, the PMMA that is substituted the functional group and PMMA blending by a caoutchouc elasticity material.Wherein, the caoutchouc elasticity material is the group that can select free butyl acrylate (butyl acrylate), polymethylmethacrylate (methyl methacrylate), styrene (styrene) to be formed, and the grain size of described caoutchouc elasticity material is less than 10 microns even may further be nanoscale.In addition, the addition of these particles is 2.5% to 50%, and the engineering properties that therefore can promote blooming, comprises character such as promoting extensibility.

The second above-mentioned blooming 226 has the optical property listed as table 1 through after testing:

Table 1

Transmittance (Light transmission)	95.23％
Transmittance (Light transmission)	95.23％	Mist degree (Haze)	0.23％
Form and aspect b	0.29	Mist degree (Haze)	0.23％
Form and aspect b	0.29	The Re value	0.2nm
The Rth value	2.9nm	The Re value	0.2nm

At this, the transmittance of second blooming 226 can use spectrophotometer (Spectrophotometer) to measure, and this spectrophotometer for example is HITACHI U-4100Spectrophotometer.The measurement process is: second blooming 226 of 4 * 4cm2 being inserted measure the position, and be that the light of 380-700nm scans with the wavelength coverage, is transmittance under the 550nm to obtain second blooming 226 at wavelength.

The mist degree of second blooming 226 can use haze meter (Haze meter) to measure, and this haze meter for example is NDH 2000Haze meter.The measurement process is: advanced line space is proofreaied and correct in vain, second blooming 226 of 4 * 4cm2 is inserted to measure the position again, in the hope of haze value.

The thickness of second blooming 226 can use model to measure as the optical thickness meter of ETA-STC, the measurement process is: after inserting second blooming 226 and importing the refractive index of second blooming 226, utilize light reflection principle, measure the thickness of second blooming 226.Then can use Abbe formula tortuosity meter (ABBE Refractometer) to measure as for the refractive index of second blooming 226, for example use the filter disc of 589nm wavelength, and obtain the refractive index of second blooming 226 under wavelength 589nm.

After, can use optical birefringence analyser (Optical birefringence analyzer) to measure the Re value and the Rth value of second blooming 226.For example, use the optical birefringence analyser of model, second blooming 226 of 4 * 4cm2 is inserted measure the position, import the thickness and measurement angular range (50 of second blooming 226 as KOBRA-21ADH.～50。), the optical birefringence analyser is just with 10.For at interval second blooming 226 being carried out the measurement of different angles; After treating that measurement finishes, import the refractive index of second blooming 226, just can obtain the Re value and the Rth value of second blooming 226.

Certainly, only just for example, those skilled in the art can select suitable measurement equipment for use and adjust the measurement process, to measure the various optical properties of second blooming 226 according to various situations for above-mentioned measurement equipment and measurement process.

The inventor of this case compares described LCD of preferred embodiment and existing LCD (as shown in Figure 1), finds that the described LCD of preferred embodiment has preferable display effect.Fig. 5 A is respectively the colour cast figure of existing LCD in color state, bright attitude, dark attitude from left to right, and Fig. 5 B is respectively the LCD of preferred embodiment from left to right in the colour cast figure of color state, bright attitude, dark attitude.Shown in Fig. 5 A and Fig. 5 B, can find that the performance of LCD on optical property of preferred embodiment obviously is better than existing LCD.

In above-mentioned, the 3rd blooming 262 mainly is made of triacetate fiber, but also can make with second blooming 226 identical formation is arranged into.Then, see also Fig. 6, Fig. 6 is the structural representation of second Polarizer of another preferred embodiment.The 3rd blooming 262 ' of second Polarizer 260 ' has identical formation with above-mentioned second blooming 226.Wherein when second Polarizer 260 ' is combined in the LCD 200, the 3rd blooming 262 ' is to be positioned at 264 of liquid crystal panel unit 230 and second polarizing layers.

The inventor of this case compares described LCD of another preferred embodiment and existing LCD (as shown in Figure 1), finds that the described LCD of another preferred embodiment has preferable display effect.Fig. 7 A is respectively the colour cast figure of existing LCD in color state, bright attitude, dark attitude from left to right, and Fig. 7 B is respectively the LCD of second preferred embodiment from left to right in the colour cast figure of color state, bright attitude, dark attitude.Shown in Fig. 7 A and Fig. 7 B, can find that the performance of LCD on optical property of second preferred embodiment obviously is better than existing LCD.

Above-mentioned first Polarizer 220 and second Polarizer 260 ', all only the wherein side at polarizing layer (that is: first polarizing layer 224 and second polarizing layer 264) disposes polymethylmethacrylate blooming, that is: second blooming 226 and the 3rd blooming 262 '.Yet first blooming 222 or the 4th blooming 266 also can change into second blooming 226 and the 3rd blooming 262 ' has identical formation.And, in preferred embodiment and another preferred embodiment, first polarizing layer 224 and second polarizing layer 264 all with polyvinyl alcohol (PVA) as main material, yet also can use the polar biased material of other kind.

In addition, in above-mentioned preferred embodiment, be the blooming (for example: first blooming 222 or the 4th blooming 266) of main material with triacetate fiber, also can select other suitable material to replace, for example: polycarbonate or poly-cycloolefin.

In addition, because polymethylmethacrylate is compared to triacetate fiber, its water absorptivity and moisture-penetrability are less, so second blooming 226 and the 3rd blooming 262 ' have more moderate water absorptivity and drenched property compared to existing TAC film.Therefore, when second blooming 226 and the 3rd blooming 262 ' use under high temperature, high humidity, be difficult for causing deformation of thin membrane or produce stress causing optical characteristics to be affected because of external environment.

In addition, because the high molecular polymer of second blooming 226 and the 3rd blooming 262 ' is a polymethylmethacrylate, so it has preferable engineering properties, as: (toughness) is more high for toughness.

In sum, because LCD of the present invention comprises at least a Polarizer, this Polarizer has the polymethylmethacrylate blooming, so its display quality obviously is better than existing LCD.And, above-mentioned blooming is compared to the TAC film, its water absorptivity and moisture-penetrability are less, and toughness is preferable, therefore be difficult for because of external environment causes the blooming distortion or produce stress causing optical characteristics to be affected, so also be better than existing LCD the serviceable life of LCD of the present invention.

The present invention with preferred embodiment explanation as above, so it is not in order to limiting the patent right scope that the present invention advocated, its scope of patent protection when on accompanying Claim and etc. same domain decide.All those skilled in the art, in not breaking away from this patent spirit or scope, change of being done or retouching all belong to the equivalence of being finished under the disclosed spirit and change or design, and should be included in the following claim scope.

Claims

1. a LCD is characterized in that, comprising:

One backlight module;

One liquid crystal panel unit is disposed at above the exiting surface of described backlight module;

One first Polarizer is disposed between described backlight module and described liquid crystal panel unit; And

One second Polarizer with respect to described first Polarizer, is disposed at an other side of described liquid crystal panel unit; Wherein, described first Polarizer comprises:

One first polarizing layer;

One first blooming is disposed at the wherein side of described first polarizing layer; And

One second blooming, with respect to described first blooming, be disposed at an other side of described first polarizing layer, wherein said second blooming is a polymethylmethacrylate blooming, and described second blooming is compared to the more close described liquid crystal panel unit of described first blooming.

2. LCD as claimed in claim 1 is characterized in that: described polymethylmethacrylate blooming comprises:

Arbitrary material of the cohort that selection is formed in PMMA, the PMMA that is substituted the functional group and PMMA blending; And

One solvent; Wherein, select arbitrary material of the cohort formed from PMMA, the PMMA that is substituted the functional group and PMMA blending, evenly be blended in the described solvent with arbitrary proportion according to the required character of described polymethylmethacrylate blooming.

3. LCD as claimed in claim 2, it is characterized in that: in described polymethylmethacrylate blooming, arbitrary material of the cohort that selection is formed in PMMA, the PMMA that is substituted the functional group and PMMA blending is the described solvent of number percent blending with 20% to 40%.

4. LCD as claimed in claim 2, it is characterized in that: in described polymethylmethacrylate blooming, the functional group that is substituted who is substituted functional group's PMMA is methyl, and it is a methyl of selecting to replace with ethyl, propyl group, isopropyl, normal-butyl, isobutyl, new butyl, n-hexyl, isohesyl, cyclohexyl or several aforesaid functional groups PMMA.

5. LCD as claimed in claim 2 is characterized in that: in described polymethylmethacrylate blooming, described solvent is arbitrary solvent of selecting in toluene, acetone, methyl acetate, aromatic series, naphthenic, ethers, ester class and the ketone;

Wherein said aromatic series is to select toluene, ortho-xylene ,-arbitrary kenel in dimethylbenzene and the right-dimethylbenzene; Described naphthenic comprises cyclohexane; Described ethers is arbitrary ethers of selecting in Anaesthetie Ether and the tetrahydrofuran; Described ester class is arbitrary ester class of selecting in methyl acetate and the ethyl acetate; And described ketone is arbitrary ketone of selecting in acetone, methyl ethyl ketone and the 1-methyl-cyclopentanone.

6. LCD as claimed in claim 2, it is characterized in that: in described polymethylmethacrylate blooming, further add a plurality of particles, described particle coats arbitrary material of selecting the cohort formed in PMMA, the PMMA that is substituted the functional group and PMMA blending by a caoutchouc elasticity material and forms.

7. LCD as claimed in claim 6 is characterized in that: in described polymethylmethacrylate blooming, described caoutchouc elasticity material is the group that selection is made up of butyl acrylate, polymethylmethacrylate, styrene; And the addition of described particle is 2.5% to 50%.

8. LCD as claimed in claim 2 is characterized in that: further add tripoli in described polymethylmethacrylate blooming, the addition of described tripoli is 0.5% to 15% of a blooming weight.

9. as any described LCD in the above-mentioned claim, it is characterized in that: described second Polarizer comprises:

One second polarizing layer;

One the 3rd blooming is disposed at the wherein side of described second polarizing layer; And

One the 4th blooming, with respect to described the 3rd blooming, be disposed at an other side of described second polarizing layer, wherein said the 4th blooming has identical formation with described polymethylmethacrylate blooming, and described the 4th blooming is compared to the more close described liquid crystal panel unit of described the 3rd blooming.

10. LCD as claimed in claim 1 is characterized in that: described liquid crystal panel unit is the liquid crystal panel unit of horizontal suitching type.