CN1786791A - Light controlling film and liquid crystal display apparatus - Google Patents
Light controlling film and liquid crystal display apparatus Download PDFInfo
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- CN1786791A CN1786791A CNA2004100984007A CN200410098400A CN1786791A CN 1786791 A CN1786791 A CN 1786791A CN A2004100984007 A CNA2004100984007 A CN A2004100984007A CN 200410098400 A CN200410098400 A CN 200410098400A CN 1786791 A CN1786791 A CN 1786791A
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Abstract
The invention supplies a light control film and a liquid display device. The film includes a wave length selective reflection film, a polarized film, and a brightness enhancing film. The wave length selective reflection film and the polarized film include first cholesterol liquid layer and the second cholesterol liquid layer.
Description
Technical field
The present invention relates to a kind of light controlling film and liquid crystal indicator, especially relate to a kind of light controlling film that is applied to liquid crystal display systems, for example the cholesterol liquid crystal light controlling film; And relate to a kind of liquid crystal indicator.
Background technology
Lcd technology is one of the display technique the most fast of growing up on technical progress and market penetration rate in recent years.In recent years, replacing with LCD in the process of traditional C RT (Cathode Ray Tube) display, the bottleneck that LCD can't surmount the CRT monitor technology always be LCD brightness, color contrast, answer speed, with problem such as visual angle.Yet under the demand of huge market, during the problem of many lcd technologies is improved just step by step.
In the brightness performance of LCD, early stage liquid crystal display systems is after successively handling light source via each layer composition assembly, the real light source service efficiency that is transformed on the screen by backlight is less than 10%, this has had a strong impact on the brightness performance of this display, and also can be because of the not good heat management problems that derives of energy conversion efficiency.In the composition assembly of liquid crystal display systems, the assembly that the light source service efficiency is on the low side mainly is in the light polarizing film that produces polarized light.Because main employed linear polarizing film is absorption light polarizing film on market at present, its purposes mainly is to allow the light source of some particular polarization pass through, therefore, as long as a unpolarized light is through this type light polarizing film, can be absorbed by light polarizing film fully with the part of light polarizing film different polarization direction in the light and lose phototranstormation efficiency over half.Therefore, in order to promote the brightness performance of display, the technical design that begins to increase the reflecting type polarizing film, allowing originally can't be by the polarized light of absorption light polarizing film, before it is by absorption light polarizing film, earlier via a reflecting type polarizing film with its reflected back backlight module, to reclaim these polarized lights.
Known a kind of Vikuiti be in conjunction with a reflecting type polarizing rete and a phasic difference plate allow nonpolarized light from backlight module be divided into penetrable this brightness enhancement film and polarized light and with specific polarization mode by the polarized light of this brightness enhancement film reflected back backlight module.Its effect is as shown in Figure 1.One nonpolarized light 11 ' that is sent by backlight module 1 ' is behind directive one cholesteric liquid crystal layer 22 ', and it produces one right-handed polarized light 13 ' and penetrates this cholesteric liquid crystal layer 22 ' and one left-hand polarization light 12 ' by this this backlight module 1 ' of cholesterol liquid crystal 22 ' reflected back; This left-hand polarization light 12 ' is transformed into right-handed polarized light 13 ' and passes through this cholesteric liquid crystal layer 22 ' smoothly via backlight module 1 ' reflection again, to reach the effect that increases the light penetration rate.Do the position via one 1/4 wavelength phasic difference plates 24 ' again and be adjusted to linearly polarized light 14 ' mutually and penetrate cholesteric liquid crystal layer right-handed polarized light 13 ', the polarization direction of this linearly polarized light 14 ' is identical with the polarization direction of light polarizing film 3 ', therefore, most light can both not absorbed by this light polarizing film 3 ' by this light polarizing film 3 ', to reach the effect that promotes liquid crystal display systems brightness.
Although known cholesteric liquid crystalline state brightness enhancement film (Cholesteric Liquid Crystal-basedBrightness Enhancement Film, CBEF) see through the special construction of cholesterol liquid crystal, can effectively promote light service efficiency by nonpolarized light being changed into dextrorotation and left-handed polarized light by light polarizing film, but influence because of pitch between the liquid crystal molecule of cholesteric liquid crystal layer own and molecule major and minor axis refractive index, when light is injected this liquid crystal layer with an angle, can make the spectrum of wavelengths of reflection ray produce skew toward short wavelength's direction; Cause the light (as ruddiness etc.) of longer wavelength to be reflected and penetrate brightness enhancement film, therefore cause the CBEF LCD under situation with great visual angle, to have red partially situation and produce by this brightness enhancement film.
Therefore by above narration as can be known, the blast technology has been a kind of indispensable technology of LCD, need seek the light controlling film that can keep the brightening effect of CBEF simultaneously and effectively solve inclined to one side ruddiness phenomenon seen under the situation with great visual angle.
Summary of the invention
The objective of the invention is to for the shortcoming that overcomes above-mentioned prior art provides a kind of light controlling film and a kind of liquid crystal indicator, with the brightening effect of keeping CBEF and effectively solve with great visual angle seen inclined to one side ruddiness phenomenon under the situation.
For achieving the above object, the invention provides a kind of light controlling film, it comprises: a wavelength selectivity reflectance coating, and it is in order to the light of reflection wavelength greater than visible-range; One light polarizing film, it is positioned on this wavelength selectivity reflectance coating, uses so that a polarized light with particular polarization passes through; One brightness enhancement film, it is used so that can't be by the circularly polarized light reflection of this brightness enhancement film between this wavelength selectivity reflectance coating and this light polarizing film.
According to above-mentioned conception, wherein this wavelength selectivity reflectance coating comprises one first cholesteric liquid crystal layer.
According to above-mentioned conception, wherein this brightness enhancement film comprises one second cholesteric liquid crystal layer and a phasic difference plate.
According to above-mentioned conception, wherein respectively this first and second cholesteric liquid crystal layer has pitch between different liquid crystal molecules.
According to above-mentioned conception, wherein respectively the catoptrical wavelength of this first and second cholesteric liquid crystal layer satisfies formula: λ (θ)=nP
0Cos (sin
-1Sin θ/n) make that the catoptrical wavelength of light controlling film can be in the scope of visible light, wherein λ is reflection wavelength, P
0For pitch, n between liquid crystal molecule are that the mean refractive index in reflection horizon, θ are the angle of incidence of light degree.
According to above-mentioned conception, the phasic difference plate that wherein this brightness enhancement film comprised is one 1/4 wavelength plates.
According to above-mentioned conception, wherein this light polarizing film is an absorption linear polarizing film.
The present invention also proposes a kind of light controlling film, and it comprises: a transparent substrates; One wavelength selectivity reflection horizon, its position are on this substrate, and in order to the light of reflection greater than visible wavelength range, wherein this wavelength selectivity reflection horizon comprises a cholesteric liquid crystal layer, and its reflection wavelength satisfies formula: λ (θ)=nP
0Cos (sin
-1Sin θ/n) can move toward visible-range when incident angle becomes big, wherein λ is reflection wavelength, P
0For pitch, n between liquid crystal molecule are that the mean refractive index in reflection horizon, θ are the angle of incidence of light degree.
According to above-mentioned conception, wherein the reflection ray wavelength in this wavelength selectivity reflection horizon is more than the 700nm.
The present invention also proposes a kind of blooming, and it comprises: a wavelength selectivity reflection horizon, and it is in order to the light of reflection wavelength greater than visible-range; One reflecting type polarizing layer, it is positioned on this wavelength selectivity reflection horizon, in order to the light of reflective for visible light wavelengths scope; One phasic difference plate, it is positioned on this reflecting type polarizing layer, and wherein this wavelength selectivity reflection horizon and this reflecting type polarizing layer comprise one first cholesteric liquid crystal layer and one second cholesteric liquid crystal layer respectively, and its reflecting light covers with sufficient formula: λ (θ)=nP
0Cos (sin
-1Sin θ/n) makes the reflected light wavelength of this blooming can be in the scope of visible light, and wherein λ is reflection wavelength, P
0For pitch, n between liquid crystal molecule are that the mean refractive index in reflection horizon, θ are the angle of incidence of light degree.
According to above-mentioned conception, wherein respectively this cholesteric liquid crystal layer has different intermolecular pitch.
According to above-mentioned conception, wherein this phasic difference plate is one 1/4 wavelength plates.
The present invention also proposes a kind of liquid crystal indicator, and it comprises: a backlight, in order to the light source of this display device to be provided; One wavelength selectivity reflection horizon, it is positioned on this backlight, in order to the light of reflection wavelength greater than visible-range; One reflecting type polarizing layer, it is positioned on this wavelength selectivity reflection horizon; One phasic difference plate, it is positioned on this reflecting type polarizing layer, becomes linearly polarized light in order to transform circularly polarized light; One first and one second light polarizing film, it is positioned on this phasic difference plate, described first and the polarization direction of one second light polarizing film orthogonal; And a liquid crystal layer, it is between this first and second light polarizing film, in order to the direction of transfer of control light.Wherein, this reflecting type polarizing layer be in order to reflection can't be by this reflecting type polarizing layer circularly polarized light, and the reflected wavelength range shift phenomenon that is produced during the skew of visual angle must achieve a solution because of the reflection wavelength skew in wavelength selectivity reflection horizon.
According to above-mentioned conception, wherein this wavelength selectivity reflection horizon comprises one first cholesteric liquid crystal layer.
According to above-mentioned conception, wherein this reflecting type polarizing layer is one to comprise the reflecting type polarizing film of one second cholesteric liquid crystal layer.
According to above-mentioned conception, wherein respectively this first and second cholesteric liquid crystal layer has pitch between different liquid crystal molecules.
According to above-mentioned conception, wherein respectively the reflecting light of this first and second cholesteric liquid crystal layer covers with sufficient formula: λ (θ)=nP
0Cos (sin
-1Sin θ/n) makes this wavelength selectivity reflection horizon can be positioned at the scope of visible light in conjunction with the reflected light wavelength of this reflecting type polarizing layer, and wherein λ is reflection wavelength, P
0For pitch, n between liquid crystal molecule are that the mean refractive index in reflection horizon, θ are the angle of incidence of light degree.
According to above-mentioned conception, wherein this first and this second light polarizing film be an absorption light polarizing film.
According to above-mentioned conception, wherein this phasic difference plate is one 1/4 wavelength plates.
Description of drawings
Fig. 1 is the light control synoptic diagram of traditional cholesteric liquid crystalline state brightness enhancement film;
Fig. 2 is the structural drawing of a light controlling film of the present invention;
Fig. 3 (a) is for using an optic film structure figure of light controlling film of the present invention;
Fig. 3 (b), (c) are a blooming of using light controlling film of the present invention and the structural drawing that backlight module system is arranged in pairs or groups or the polarisation mould is arranged in pairs or groups;
Fig. 4 is for using a liquid crystal indicator structural drawing of light controlling film of the present invention;
Wherein, description of reference numerals is as follows:
1 ', the 10-backlight module; 11 '-nonpolarized light;
12 '-left circularly polarized light; 13 '-right-circularly polarized light;
14 '-linearly polarized photon; 2 '-cholesteric liquid crystalline state brightness enhancement film;
20-wavelength selectivity reflectance coating; 201, the 221-transparent substrates;
22 ', 202, the 222-cholesteric liquid crystal layer; 24 ', 224-phasic difference plate;
The 22-brightness enhancement film; 30,301, the 301-light polarizing film;
The 40-liquid crystal layer; The 100-light controlling film;
The 200-blooming; The 300-liquid crystal indicator.
Embodiment
See also Fig. 2, it is a kind of light controlling film 100 of the present invention, and its structure comprises a wavelength selectivity reflectance coating 20, a light polarizing film 30 and a brightness enhancement film 22; Wherein this wavelength selectivity reflectance coating 20 is to comprise one first cholesteric layer 202 and one first transparent substrates 201, and it is in order to the light of reflection wavelength greater than visible-range.Wherein this brightness enhancement film 22 is made up of a reflecting type polarizing layer and a phasic difference plate 224.This reflecting type polarizing layer comprises a transparent substrates 221, one second cholesteric liquid crystal layer 222, wherein this second cholesteric liquid crystal layer 222 is to reflect in order to the polarized light that can't pass through this brightness enhancement film, and this phasic difference plate 224 is in order to will change into linearly polarized light by the circularly polarized light of second cholesteric liquid crystal layer 222 with the light polarizing film 30 by its upper strata.Wherein this potential difference plate 224 can be one 1/4 wavelength plates, and this light polarizing film 30 can be an absorption linear polarizing film.This first and second cholesteric liquid crystal layer 202,222nd wherein has the structure of same-handed direction but has different intermolecular pitch.And pitch, liquid crystal molecule mean refractive index and incident angle of light are relevant between the liquid crystal molecule of the reflected light wavelength of this first and second cholesteric liquid crystal layer 202,222 and this cholesteric liquid crystal layer 202,222 respectively, and it is to satisfy formula: λ (θ)=nP
0Cos (sin
-1Sin θ/n), wherein λ is reflection wavelength, P
0For pitch, n between liquid crystal molecule are that the mean refractive index in reflection horizon, θ are the angle of incidence of light degree.Wherein the reflected light wavelength of this first cholesteric liquid crystal layer 202 is to be controlled at greater than visible wavelength range, should can be the wavelength more than the 700nm greater than visible wavelength range; The reflection wavelength of this second cholesteric liquid crystal layer 222 is to be controlled within the visible wavelength range.Therefore, when a light enters this light controlling film 100 by these wavelength selectivity reflectance coating 20 below direct projections, wavelength is greater than the reflected light of visible-range, can be reflected by first cholesteric liquid crystal layer 202, the reflected light of wavelength in visible-range can be reflected by second cholesteric liquid crystal layer 222.And when a light source by these wavelength selectivity reflectance coating 20 belows during with this light controlling film 100 of angle incident, respectively the reflected light wavelength of this first and second cholesteric liquid crystal layer 202,222 will be offset to the short wavelength because of the influence that is subjected to incident angle.Therefore long wavelength's visible light (as ruddiness) is because the reflected light wavelength of second cholesteric liquid crystal layer 222 can't reflect toward the influence of short wavelength's skew.And by the reflected light wavelength of first cholesteric liquid crystal layer 202 by greater than the influence of visible-range toward the visible-range skew, make originally and can't can reflect and obtain compensation by the long wavelength's of second cholesteric liquid crystal layer, 222 reflections visible light (as ruddiness) in advance by first cholesteric liquid crystal layer 202 in this wavelength selectivity reflectance coating 20.Therefore, by first cholesteric liquid crystal layer 202 and 222 controls of second cholesteric liquid crystal layer, catoptrical wavelength coverage can maintain in the visible-range, and then reaches the purpose of light control.
See also Fig. 3 (a), the present invention also proposes a kind of blooming 200 of controlling reflected light wavelength scope, and it is to comprise a wavelength selectivity reflectance coating 20 and a brightness enhancement film 22; Wherein this wavelength selectivity reflectance coating 20 is to comprise one first cholesteric layer 202 and one first transparent substrates 201, and it is in order to the light of reflection wavelength greater than visible-range.Wherein this brightness enhancement film 22 is made up of a reflecting type polarizing layer and a phasic difference plate 224.This reflecting type polarizing layer comprises a transparent substrates 221, one second cholesteric liquid crystal layer 222, wherein this second cholesteric liquid crystal layer 222 is the polarized light reflections in order to passing through, and this phasic difference plate 224 is in order to changing into linearly polarized light by the circularly polarized light of second cholesteric liquid crystal layer 222.
This blooming 200 is a cholesteric liquid crystalline state optical compensation films, and this first and second cholesteric liquid crystal layer 202,222nd wherein has the structure of same-handed direction but has different intermolecular pitch.And pitch, liquid crystal molecule mean refractive index and incident angle of light are relevant between the liquid crystal molecule of the reflected light wavelength of this first and second cholesteric liquid crystal layer 202,222 and this cholesteric liquid crystal layer 202,222 respectively, and it is to satisfy formula: λ (θ)=nP
0Cos (sin
-1Sin θ/n), wherein λ is reflection wavelength, P
0For pitch, n between liquid crystal molecule are that the mean refractive index in reflection horizon, θ are the angle of incidence of light degree.Wherein the reflection wavelength of this first cholesteric liquid crystal layer 202 is to be controlled at wavelength greater than visible-range, should can be the reflected light more than the wavelength 700nm greater than the reflected light of visible light; The reflection wavelength of this second cholesteric liquid crystal layer 222 is to be controlled at visible wavelength range.Therefore, when a light source enters this blooming 200 by this wavelength selectivity reflectance coating below direct projection, wavelength is reflected by first cholesteric liquid crystal layer 202 greater than the reflected light of visible-range, and the reflected light of wavelength in visible-range reflected by second cholesteric liquid crystal layer 222.And when a light source by these wavelength selectivity reflectance coating 20 belows during with this blooming 200 of angle incident, the reflected light wavelength of this first and second cholesteric liquid crystal layer 202,222 all is offset to short wavelength range because being subjected to the influence of incident angle.Therefore long wavelength's visible light (as ruddiness) can't reflect because of the influence of the past short wavelength's skew of the reflected light wavelength of second cholesteric liquid crystal layer 222.And by the reflected light wavelength of first cholesteric liquid crystal layer 202 by greater than visible-range toward the skew of visible light (short wavelength) scope, make originally the long wavelength's that can't be reflected by second cholesteric liquid crystal layer 222 visible light (as ruddiness) to reflect in advance and obtain compensation by first cholesteric liquid crystal layer 202 in this wavelength selectivity reflectance coating 20.Therefore, the wavelength coverage of first cholesteric liquid crystal layer 202 and second cholesteric liquid crystal layer 222 can maintain in the visible-range, and then reaches the purpose that reclaims polarization light and the skew of compensatory reflex optical wavelength.Shown in Fig. 3 (b) and Fig. 3 (c), blooming 200 of the present invention can select to arrange in pairs or groups backlight module 10 or light polarizing film 30 one of them enforcement.And in another better embodiment (not shown), wavelength selectivity reflectance coating proposed by the invention also can be used as a simple and easy light controlling film, and arrange in pairs or groups other kinds display element, optical mirror slip etc., as the light control at inclination visual angle.
See also Fig. 4, the present invention also proposes a kind of liquid crystal indicator 300 that comprises light controlling film of the present invention, and it is to comprise: a backlight module (backlight) 10, in order to the light source of this display device to be provided; One wavelength selectivity reflection horizon 20, it is to comprise one first transparent substrates 201 and one first cholesteric liquid crystal layer 202, in order to reflection wavelength optionally greater than the light of visible-range; One brightness enhancement film of forming by a reflecting type polarizing layer and a phasic difference plate 224 22, wherein this reflecting type polarizing layer comprises a photic zone substrate 221, one second cholesteric liquid crystal layer 222 (this reflecting type polarizing layer can be a reflecting type polarizing film that comprises one second cholesteric liquid crystal layer), and this brightness enhancement film 22 is positioned on this wavelength selectivity reflection horizon 20; One first and one second light polarizing film 301,302, it is to be positioned on this phasic difference plate 224, wherein the polarization direction of this first and second light polarizing film 301,302 is orthogonal; And a liquid crystal layer 40, it is positioned between this first and second light polarizing film 301,302, in order to the direction of transfer of control light.Wherein pitch, liquid crystal molecule mean refractive index and incident angle of light are relevant between the liquid crystal molecule of the reflected light wavelength of this first and second cholesteric liquid crystal layer 202,222 and this cholesteric liquid crystal layer respectively, and it is to satisfy formula: λ (θ)=nP
0Cos (sin
-1Sin θ/n), wherein λ is reflection wavelength, P
0For pitch, n between liquid crystal molecule are that the mean refractive index in reflection horizon, θ are the angle of incidence of light degree.Wherein the reflected light wavelength of this first cholesteric liquid crystal layer 202 is to be controlled at greater than visible wavelength range, should can be the wavelength more than the 700nm greater than visible wavelength range; The reflection wavelength of this second cholesteric liquid crystal layer 222 is to be controlled within the visible wavelength range.Therefore, when a light enters this light controlling film 100 by these wavelength selectivity reflectance coating 20 below direct projections, wavelength is greater than the reflected light of visible-range, can be reflected by first cholesteric liquid crystal layer 202, the reflected light of wavelength in visible-range can be reflected by second cholesteric liquid crystal layer 222.And when a light source by these wavelength selectivity reflectance coating 20 belows during with this light controlling film 100 of angle incident, respectively the reflected light wavelength of this first and second cholesteric liquid crystal layer 202,222 will be offset to the short wavelength because of the influence that is subjected to incident angle.Therefore long wavelength's visible light (as ruddiness) is because the reflected light wavelength of second cholesteric liquid crystal layer 222 can't reflect toward the influence of short wavelength's skew.And by the reflected light wavelength of first cholesteric liquid crystal layer 202 by greater than the influence of visible-range toward the visible-range skew, make originally and can't can reflect and obtain compensation by the long wavelength's of second cholesteric liquid crystal layer, 222 reflections visible light (as ruddiness) in advance by first cholesteric liquid crystal layer 202 in this wavelength selectivity reflectance coating 20.Therefore, by first cholesteric liquid crystal layer 202 and 222 controls of second cholesteric liquid crystal layer, this liquid crystal indicator 300 can maintain in the visible wavelength range via the reflected light wavelength of wavelength selectivity reflectance coating 20 with brightness enhancement film 22 reflections.After the reflected light that is reflected via wavelength selectivity reflectance coating 20 and this brightness enhancement film 22 is got back to backlight module 10, can be again secondary reflection and its polarization direction after backlight module 10 reflections, can convert reverse direction to again via backlight module 10, therefore can be by wavelength selectivity reflectance coating 20 and this brightness enhancement film 22; And be to be converted to linearly polarized light via this phasic difference plate 224 by the light of wavelength selectivity reflectance coating 20 and brightness enhancement film 22, the polarization direction of this linearly polarized light has identical polarization direction with first light polarizing film 301 of its top, and wherein this phasic difference plate 224 can be one 1/4 wavelength plates.And just can pass through first light polarizing film 301 by the linearly polarized light of phasic difference plate 224.Light by first light polarizing film 301 just can make image formation by rays on this liquid crystal indicator 300 via liquid crystal layer 40 control light direction of transfers.
In sum, the invention provides a kind of light color offset and raising light service efficiency of compensating Light controlling film, and use blooming, display unit of this light controlling film etc. The present invention carries Go out a kind ofly can promote simultaneously that liquid crystal indicator brightness and compensation cholesterol liquid crystal brightness enhancement film meet with The color offset problem.
Claims (12)
1. light controlling film, it comprises:
One wavelength selectivity reflectance coating, it is in order to the light of reflection greater than visible wavelength range;
One light polarizing film, it is positioned on this wavelength selectivity reflectance coating, uses so that a polarized light with particular polarization passes through; One brightness enhancement film, it is between this wavelength selectivity reflectance coating and this light polarizing film, uses so that can't be by the circularly polarized light reflection of this brightness enhancement film.
2. light controlling film as claimed in claim 1 is characterized in that, this wavelength selectivity reflectance coating comprises one first cholesteric liquid crystal layer.
3. light controlling film as claimed in claim 1 is characterized in that, this brightness enhancement film comprises one second cholesteric liquid crystal layer and a phasic difference plate.
4. as claim 2 or 3 described light controlling films, it is characterized in that:
Respectively this first and second cholesteric liquid crystal layer has pitch between different liquid crystal molecules;
Respectively the reflection wavelength of this first and second cholesteric liquid crystal layer is to satisfy formula: λ (θ)=nP
0Cos (sin
-1Sin θ/n) makes the catoptrical wavelength of this light controlling film can be positioned at the scope of visible light, and wherein λ is reflection wavelength, P
0For pitch, n between liquid crystal molecule are that the mean refractive index in reflection horizon, θ are the angle of incidence of light degree; And/or
The phasic difference plate that this brightness enhancement film comprised is one 1/4 wavelength plates.
5. light controlling film as claimed in claim 1 is characterized in that, this light polarizing film is an absorption linear polarizing film.
6. light controlling film, it comprises:
One transparent substrates;
One wavelength selectivity reflection horizon, it is positioned on this substrate, in order to the light of reflection greater than visible wavelength range;
Wherein this wavelength selectivity reflection horizon comprises a cholesteric liquid crystal layer, and its reflection wavelength satisfies formula: λ (θ)=nP
0Cos (sin
-1Sin θ/n) move toward visible-range when incident angle becomes big, wherein λ is reflection wavelength, P
0For pitch, n between liquid crystal molecule are that the mean refractive index in reflection horizon, θ are the angle of incidence of light degree.
7. light controlling film as claimed in claim 6 is characterized in that, the reflection ray wavelength in this wavelength selectivity reflection horizon is more than the 700nm.
8. blooming, it comprises:
One wavelength selectivity reflection horizon, it is in order to the light of reflection greater than visible wavelength range;
One reflecting type polarizing layer, it is positioned on this wavelength selectivity reflection horizon, in order to the light of reflective for visible light wavelengths scope; One phasic difference plate, it is positioned on this reflecting type polarizing layer, wherein:
This wavelength selectivity reflection horizon and this reflecting type polarizing layer comprise one first cholesteric liquid crystal layer and one second cholesteric liquid crystal layer respectively, and its reflection wavelength satisfies formula: λ (θ)=nP
0Cos (sin
-1Sin θ/n) makes the reflected light wavelength of this blooming can be positioned at the scope of visible light, and wherein λ is reflection wavelength, P
0For pitch, n between liquid crystal molecule are that the mean refractive index in reflection horizon, θ are the angle of incidence of light degree.
9. liquid crystal indicator, it comprises:
One backlight is in order to provide the light source of this display device;
One wavelength selectivity reflection horizon, it is positioned on this backlight, in order to the light of reflection greater than visible wavelength range;
One reflecting type polarizing layer, it is positioned on this wavelength selectivity reflection horizon;
One phasic difference plate, it is positioned on this reflecting type polarizing layer, in order to circularly polarized light is changed into linearly polarized light;
One first and one second light polarizing film, it is positioned on this phasic difference plate, described first and the polarization direction of one second light polarizing film orthogonal; And
One liquid crystal layer, it is between this first and second light polarizing film, in order to the direction of transfer of control light;
Wherein, this reflecting type polarizing layer in order to reflection can't be by this reflecting type polarizing layer circularly polarized light, and the reflection wavelength skew in wavelength selectivity reflection horizon during the skew of visual angle.
10. liquid crystal indicator as claimed in claim 9 is characterized in that, this wavelength selectivity reflection horizon comprises one first cholesteric liquid crystal layer.
11. liquid crystal indicator as claimed in claim 9 is characterized in that, this reflecting type polarizing layer is one to comprise the reflecting type polarizing film of one second cholesteric liquid crystal layer.
12., it is characterized in that as claim 10 or 11 described liquid crystal indicators:
Respectively this cholesteric liquid crystal layer has pitch between different liquid crystal molecules; And/or
Respectively the reflecting light of this cholesteric liquid crystal layer covers with sufficient formula: λ (θ)=nP
0Cos (sin
-1Sin θ/n) and the reflected light wavelength of this wavelength selectivity reflection horizon and this reflecting type polarizing layer can be positioned at the scope of visible light, wherein λ is reflection wavelength, P
0For pitch, n between liquid crystal molecule are that the mean refractive index in reflection horizon, θ are the angle of incidence of light degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100984007A CN1786791A (en) | 2004-12-09 | 2004-12-09 | Light controlling film and liquid crystal display apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100984007A CN1786791A (en) | 2004-12-09 | 2004-12-09 | Light controlling film and liquid crystal display apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN1786791A true CN1786791A (en) | 2006-06-14 |
Family
ID=36784313
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|---|---|---|---|
| CNA2004100984007A Pending CN1786791A (en) | 2004-12-09 | 2004-12-09 | Light controlling film and liquid crystal display apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339308B (en) * | 2008-08-13 | 2011-03-16 | 合肥工业大学 | Multiple color low-power consumption reflection-type liquid-crystal display device |
| JP2016090928A (en) * | 2014-11-10 | 2016-05-23 | 住友化学株式会社 | Optical laminate, liquid crystal panel and liquid crystal display device |
| WO2018006868A1 (en) * | 2016-07-08 | 2018-01-11 | 京东方科技集团股份有限公司 | Polarising optical component, oled device and preparation method therefor, and display apparatus |
-
2004
- 2004-12-09 CN CNA2004100984007A patent/CN1786791A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339308B (en) * | 2008-08-13 | 2011-03-16 | 合肥工业大学 | Multiple color low-power consumption reflection-type liquid-crystal display device |
| JP2016090928A (en) * | 2014-11-10 | 2016-05-23 | 住友化学株式会社 | Optical laminate, liquid crystal panel and liquid crystal display device |
| WO2018006868A1 (en) * | 2016-07-08 | 2018-01-11 | 京东方科技集团股份有限公司 | Polarising optical component, oled device and preparation method therefor, and display apparatus |
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