CN1825181A - Polarizing plate - Google Patents
Polarizing plate Download PDFInfo
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- CN1825181A CN1825181A CN 200510008703 CN200510008703A CN1825181A CN 1825181 A CN1825181 A CN 1825181A CN 200510008703 CN200510008703 CN 200510008703 CN 200510008703 A CN200510008703 A CN 200510008703A CN 1825181 A CN1825181 A CN 1825181A
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- polarizer
- light
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- refraction coefficient
- reflective film
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Abstract
The invention relates to a polarized light board that includes a light selection reflection film and a double reflection film. The double reflection film is formed on the light selection reflection film. And the Nz=(nx-nz)/(nx-ny) value of double refection film could be in -0.1-5.0, nx is the slow axis refraction coefficient of the double refection film, and ny is the fast axis refraction coefficient, and nz is the refraction coefficient along thickness direction. The refraction film could be formed by one from polycarbonate, cellulose triacetated, metallocene cyclomonoolefin copolymer and macromolecule expanding foam material. The invention could solve the problem of red deflection phenomenon when watching in large visual angle of liquid crystal display.
Description
Technical field
The invention relates to a kind of Polarizer, be meant that especially a kind of light that utilizes selects reflective film and dual refractive film combinations and a kind of Polarizer of forming.
Background technology
Traditional LCD is to utilize two cross-polarized light plates to produce the variation of light and shade, the non-polarization light that Backlight For Liquid Crystal Display Panels produces is when being arranged at the back Polarizer of liquid crystal panel, there is light source over half to be absorbed, makes the utilization ratio of light become very poor.
In order to address this problem, produced to utilize and had the Polarizer technology of rotatory polarization two tropisms (circular dichroism), the U.S.Pat.No.6 that is proposed by Japanese Sharp (SHARP) for example, 160,595 the Polarizer technology that is applied to the side-light type LCD with rotatory polarization two tropisms (circular dichroism).See also shown in Figure 1ly, this figure is the Polarizer action synoptic diagram with rotatory polarization two tropisms of prior art LCD.This LCD 9 is made of a side-light type (edge-lit) backlight 91, Polarizer 92, a quarter wave plate 93 and liquid crystal panel 94 in regular turn.The light source that is projected when this backlight 91 is divided into left-handed via this Polarizer 92 and dextrorotation polar biased light, left-handed polar biased light can form linear polar biased light by this quarter wave plate 93, and directly arrive this liquid crystal panel 94, and dextrorotation polar biased light can be through forming left-handed polar biased light after the reflection, and then enter this quarter wave plate 93 and form available linear polar biased light, so can increase the usability of backlight.
Though yet this mode can make the brightness of this LCD and wide viewing angle improve, but can be created in the problem of watching meeting red partially with great visual angle.Please continue to consult shown in Figure 2, this figure is a light by the penetrance (transmission) of the Polarizer with rotatory polarization two tropisms and the graph of a relation of wavelength (wavelength).Indicate 1 light transmittance and wavelength relationship curve when representing the visual angle to have rotatory polarization two tropisms' Polarizer perpendicular to this, under normal condition when (visual angle is perpendicular to exiting surface), the penetrance of wavelength of visible light scope (450 nanometer to 750 nanometer) therefore can obtain good brightness much at one.But when the observer watches with a visual angle α, this moment, curve 1 meeting formed the state as curve 2 to left (shifting), the penetrance that can find red light wavelength (620 nanometer to 750 nanometer) scope under the state of curve 2 is greater than other coloured light, cause the light reflectivity of red light wavelength coverage in great visual angle the time to reduce, make the red light amount of penetrating increase, and produce red partially phenomenon.
Because this problem, can reduce consumer's acceptance level, therefore the technology of association area is numerous and confused for example drops into: U.S.Pat.No.5,731,886 disclosed technology comprise an optical layers and the layer of compensation with rotatory polarization two tropisms, this layer of compensation comprises a uniaxial film (uniaxial film), and the optical axis of this uniaxial film is the Surface Vertical with this film.
And for example the revealer of European patent application EP 0860717 A2 institute is a kind of compensate film, it comprises double-layer structure, ground floor is near having rotatory polarization two tropisms' Polarizer and have positive birefringence layer (positivebirefringence), and the second layer then is the negative birefringence layer.This double-layer structure can be arranged at the forward and backward of this Polarizer or both.
And for example there is prior art to utilize two-layer compensate film, wherein the characteristic of its refraction coefficient of one deck compensate film is nx＞ny=nz, the characteristic of its refraction coefficient of another layer compensate film is nx=xy＞nz, wherein nz is the refraction coefficient of this compensate film thickness direction, and nx and ny are the refraction coefficient that is parallel to this compensate film direction.Utilize this two-layer compensate film combination to solve the problem of color displacement.
Yet utilize the needed cost of aforesaid way too high, therefore, need a kind of Polarizer badly and solve prior art problems.
Summary of the invention
A fundamental purpose of the present invention is to provide a kind of Polarizer, utilizes light to select reflective film and birefringent film to make up and form, to reach purpose simple, easy to manufacture and that reduce cost.
A syllabus of the present invention be to provide a kind of Polarizer, utilize light to select reflective film and birefringent film to make up and form, this Polarizer combined with display panels to reach be reduced to when watching display panels with great visual angle the problem that color is red partially.
To achieve the above object, the invention provides a kind of Polarizer.This Polarizer comprises: a light is selected reflective film and dual refractive film.This birefringent film is formed at this light and selects on the reflective film.
The preferably, this light selects the reflective film for having periodically spiral helicine liquid crystal material.
The preferably, the Nz=of this birefringent film (nx-nz)/(nx-ny) value is between-0.1 to-5.0, nx is the slow axis refraction coefficient of this birefringent film, and ny is the fast axle refraction coefficient of this birefringent film, and nz is the refraction coefficient of this birefringent film thickness direction.
The preferably, this birefringent film may be selected to be polycarbonate, Triafol T, metallocene cyclic olefine copolymer and high molecular foam material one of them.Wherein this high molecular foam material may be selected to be tygon and polypropylene material one of them.
Description of drawings
Fig. 1 is the Polarizer action synoptic diagram with rotatory polarization two tropisms of prior art LCD;
Fig. 2 is the penetrance (transmission) of the Polarizer of light by having rotatory polarization two tropisms and the graph of a relation of wavelength (wavelength);
Fig. 3 A is the preferred embodiment synoptic diagram of a kind of Polarizer of the present invention;
Fig. 3 B is a birefringent film refractive index direction synoptic diagram of the present invention;
Fig. 4 improves the Polarizer and the liquid crystal panel combination synoptic diagram of colour cast for another preferred embodiment of the present invention.
Figure number label declaration: 1 curve; 2 curves; 3 Polarizers; 31 light are selected the reflective film; 32 birefringent films; 41 Polarizers; 411 light are selected the reflective film; 412 birefringent films; 42 quarter wave plates; 43 liquid crystal panels; 431 back Polarizers; 44 backlights; 9 LCD; 91 backlights; 92 Polarizers; 93 quarter wave plates; 94 liquid crystal panels.
Embodiment
For further cognitive and understanding being arranged to feature of the present invention, purpose and function, the spy describes the relevant thin portion structure of apparatus of the present invention and the theory reason of design, can understand characteristics of the present invention, and detailed description is presented below
See also shown in Fig. 3 A, this figure is the preferred embodiment synoptic diagram of a kind of Polarizer of the present invention.This Polarizer 3 includes a light and selects reflective film 31 and dual refractive film 32.This birefringent film 32 is formed at this light and selects on the reflective film 31.This light selects reflective film 31 for having spiral helicine liquid crystal material.The Nz=of this birefringent film 32 (nx-nz)/(nx-ny) value is between-0.1 to-5.0.This birefringent film can absorb the light of certain wavelength coverage, and in the present embodiment, this wavelength coverage is the wavelength coverage of ruddiness.Wherein, shown in Fig. 3 B, in the Nz definition, nxnx has the direction of largest face refraction coefficient (in-plane refractive index) for this birefringent film 32, slow axis (extraordinary axis) refraction coefficient (refractive index) that just refers to this birefringent film 32, ny is the face refraction coefficient with the nx orthogonal directions, just refers to the fast axle refraction coefficient of this birefringent film 32, and nz is the refraction coefficient of this birefringent film thickness direction.The characteristic that birefringent film with above-mentioned Nz value characteristic can have refraction coefficient simultaneously is that the compensate film of nx＞ny=nz and the characteristic of refraction coefficient are the dual nature of the compensate film of nx=xy＞nz.Other says it, and its slow axis of film with nx＞ny=nz is vertical with the face of this film, and its slow axis of the film of nx=ny＞nz is parallel with this membrane plane.
This birefringent film 32 may be selected to be polycarbonate (Polycarbonate), Triafol T (Triacetyl cellulose, TAC), the metallocene cyclic olefine copolymer (metallocene cycloolefincopolymer, mCOC) and high molecular foam material one of them.This high molecular foam material can select tygon (poly-ethylene, PE) material and polypropylene (polypropylene, PP) material one of them.
Please continue to consult shown in Figure 4, this figure is that another preferred embodiment of the present invention improves the Polarizer of colour cast and liquid crystal panel combination synoptic diagram.This combination comprises a Polarizer 41, a quarter wave plate 42 (the used quarter wave plate of the present invention is this area material commonly used), a liquid crystal panel 43 and a backlight 44.This Polarizer 41 comprises light selection reflective film 411 and dual refractive film 412.This birefringent film 412 is formed at this light and selects on the reflective film 411.This Polarizer 41 is arranged between the back Polarizer 431 of this backlight 44 and this liquid crystal panel 43.This quarter wave plate 42 is arranged between the back Polarizer 431 and this Polarizer 41 of liquid crystal panel.This light select reflective film 411 for the non-polarization light that has spiral helicine liquid crystal material and this backlight 44 can be produced be divided into the different rotation directions of twice round polar biased light it, wherein circle polar biased light can reflect together, and another road circle polar biased light can penetrate this light selection reflective film 411.This birefringent film 412 may be selected to be polycarbonate (Polycarbonate), Triafol T (Triacetyl cellulose, TAC), the metallocene cyclic olefine copolymer (metallocene cycloolefincopolymer, mCOC) and high molecular foam material one of them.This high molecular foam material can select tygon (poly-ethylene, PE) material and polypropylene (polypropylene, PP) material one of them.By above-mentioned material to form Nz=(nx-nz)/(nx-ny) value between-0.1 to-5.0 birefringent film.Wherein, this birefringent film can absorb the light of a wavelength coverage, and in the present embodiment, this wavelength coverage is the wavelength coverage of ruddiness.
Owing to when watching liquid crystal indicator with great visual angle,, make the red light amount of penetrating increase, and produce red partially phenomenon because the light reflectivity of red light wavelength coverage reduces.This is because the liquid crystal material in this liquid crystal panel 43 can change along with the angle of incident light for the phase delay effect (phase retardation effect) that incident light caused, therefore when observer's the visual angle of watching increases, can cause relatively poor image effect.Therefore the present invention is by selecting to form this birefringent film 412 on the reflective film 411 in this light, can revisal to improve LCD when watching with great visual angle, red partially problem.
The above only is preferred embodiment of the present invention, can not with the restriction scope of the invention.Be that all equalizations of doing according to claim of the present invention change and modification, will do not lose main idea of the present invention place, also do not break away from the spirit and scope of the present invention, all should be considered as further enforcement situation of the present invention.
Claims (10)
1, a kind of Polarizer is characterized in that: comprising:
One light is selected the reflective film; And
The dual refractive film, it is formed at this light and selects on the reflective film.
2, Polarizer as claimed in claim 1, wherein this light selects the reflective film for having periodically spiral helicine liquid crystal material.
3, Polarizer as claimed in claim 1, wherein the Nz=of this birefringent film (nx-nz)/(nx-ny) value is between-0.1 to-5.0, wherein nx is the slow axis refraction coefficient of this birefringent film, ny is the fast axle refraction coefficient of this birefringent film, and nz is the refraction coefficient of this birefringent film thickness direction.
4, Polarizer as claimed in claim 1, wherein this birefringent film can select polycarbonate, Triafol T, metallocene cyclic olefine copolymer and high molecular foam material one of them.
5, Polarizer as claimed in claim 4, wherein this high molecular foam material may be selected to be polythene material and polypropylene material one of them.
6, Polarizer as claimed in claim 1, it can be arranged between the back Polarizer and backlight of display panels, can improve this display panels red partially problem of colourity when watching with great visual angle.
7, Polarizer as claimed in claim 6, wherein this light selection reflective film is the liquid crystal material that non-polarization light can be divided into the round polar biased light of the different rotation directions of twice, wherein circle polar biased light can reflect together, and another road circle polar biased light can penetrate this light selection reflective film.
8, also be provided with a quarter wave plate between the Polarizer as claimed in claim 7, itself and this back Polarizer.
9, Polarizer as claimed in claim 1, wherein this birefringent film can absorb the light of a wavelength coverage.
10, Polarizer as claimed in claim 9, wherein this wavelength coverage is the wavelength coverage of ruddiness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510008703 CN1825181A (en) | 2005-02-23 | 2005-02-23 | Polarizing plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510008703 CN1825181A (en) | 2005-02-23 | 2005-02-23 | Polarizing plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1825181A true CN1825181A (en) | 2006-08-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510008703 Pending CN1825181A (en) | 2005-02-23 | 2005-02-23 | Polarizing plate |
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| CN (1) | CN1825181A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9201267B2 (en) | 2013-06-20 | 2015-12-01 | Xiamen Tianma Micro-Electronics Co., Ltd. | Optical film and liquid crystal display |
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2005
- 2005-02-23 CN CN 200510008703 patent/CN1825181A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9201267B2 (en) | 2013-06-20 | 2015-12-01 | Xiamen Tianma Micro-Electronics Co., Ltd. | Optical film and liquid crystal display |
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