CN103424920A - Light valve component allowing adjustment of penetration rate of infrared light - Google Patents
Light valve component allowing adjustment of penetration rate of infrared light Download PDFInfo
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- CN103424920A CN103424920A CN2013101101626A CN201310110162A CN103424920A CN 103424920 A CN103424920 A CN 103424920A CN 2013101101626 A CN2013101101626 A CN 2013101101626A CN 201310110162 A CN201310110162 A CN 201310110162A CN 103424920 A CN103424920 A CN 103424920A
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Abstract
The invention provides a light valve component allowing adjustment of a penetration rate of infrared light. The light valve component comprises a first metal wire grating polaroid, a twisted nematic liquid crystal box and a second metal wire grating polaroid, wherein the first metal wire grating polaroid comprises a first absorption axis and is used for receiving incident light and forming a first polarized beam; the twisted nematic liquid crystal box is used for receiving the first polarized beam, electrically coupled with a driving voltage and used for controlling orientations of liquid crystal molecules to convert the first polarized beam into a second polarized beam; the second metal wire grating polaroid comprises a second absorption axis and is used for converting the second polarized beam into an output beam and adjusting the penetration rate of the infrared light in the output beam by means of the parallel or orthogonal state between the absorption axes. Compared with the prior art, the light valve component has the advantages that penetrating frequency spectrums allowing full-band passing of the incident light, passing of visible light and no-passing of the infrared light in the incident light and full-band no-passing of the incident light can be achieved by the light valve component through control of the driving voltage. Thus, a user can adjust the penetration rate of the infrared light independently under the condition that all visible light passes.
Description
Technical field
The present invention relates to a kind of wire grating polaroid (wire grid polarizer), relate in particular to a kind of light valve (light shutter) assembly of adjusting the infrared light penetrance based on the wire grating polaroid.
Background technology
Glass is important building materials, and along with to the improving constantly of decorating building requirement, the use amount of glass in building trade also constantly increases.Yet current people, when selecting the glass door and window of buildings, except considering its aesthetics and external appearance characteristic, more focus on its heat control, refrigeration cost and inner sunlight and project the problems such as comfortable balance.This just makes the upstart in coated glass family---Low-E(Low Emissivity) and glass shows one's talent, and becomes the focus that people pay close attention to.
Particularly, LOW-E is a kind of low radiation coated glass, is the relatively hot reflecting glass.Its film that plates multiple layer metal or other compounds composition at glass surface is product, because these film plating layers have the characteristic to visible ray high-penetration and the high reflection of centering far infrared, it is compared with simple glass and traditional coated glass for building, more highlight excellent effect of heat insulation and good light transmission.Yet current window for building mostly is Low-E glass, it penetrates spectral characteristic is reflects infrared light and allows visible ray pass through, and this spectral characteristic that penetrates means, the user can not at random adjust the even penetrance of infrared light of visible ray.In order to meet the adjustable demand that penetrates frequency spectrum, existing solution is applied in electrochromism and Liquid crystal module on building glass one after another, and still, above-mentioned measure still can't be adjusted the penetrance of infrared ray frequency range effectively.
In view of this, how designing a kind of glass material of penetrance of capable of regulating infrared ray frequency range, in order to eliminate above-mentioned defect of the prior art or deficiency, is a person skilled problem urgently to be resolved hurrily in the industry.
Summary of the invention
For LOW-E glass of the prior art existing above-mentioned defect when adjusting the penetrance of infrared ray frequency range, the invention provides a kind of light valve assembly of capable of regulating infrared light penetrance.
According to one aspect of the present invention, a kind of light valve assembly of capable of regulating infrared light penetrance is provided, comprising:
One first wire grating polaroid, have one first absorption axes, in order to receive from outside incident light, and forms one first light beam;
One twisted nematic liquid crystals box, in order to receive described the first light beam, described twisted nematic liquid crystals box is electrically coupled to a driving voltage, and utilizes described driving voltage to control the orientation of its liquid crystal molecule, so that described the first light beam is converted into to one second light beam; And
One second wire grating polaroid, there is one second absorption axes, parallel or quadrature by between described the first absorption axes and described the second absorption axes, be converted to described the second light beam output beam and adjust the infrared light penetrance in described output beam.
Preferably, this twisted nematic liquid crystals box comprises the nematic liquid crystal of positive dielectric anisotropy.Further, the refractive index anisotropy of this nematic liquid crystal (Δ n) is greater than 952 nanometers with the product Δ nd of the thickness of liquid crystal layer (d) of described liquid crystal cell.
Preferably, the wavelength coverage of incident light is 380 nanometers～2500 nanometers.
Preferably, when described the first absorption axes and described the second absorption axes, when orthogonal, described light valve assembly is adjusted the penetrance of described infrared light.
In an embodiment therein, when driving voltage is 0V, described incident light penetrates described the second wire grating polaroid in the full frequency band mode.
In an embodiment therein, when driving voltage is first voltage, the visible ray in described incident light penetrates described the second wire grating polaroid, and the infrared light in described incident light can't pass through described the second wire grating polaroid.For example, the first voltage is 2.5V.
In an embodiment therein, when driving voltage is a second voltage, in described incident light, the light of all wave bands all can't penetrate described the second wire grating polaroid.For example, second voltage is 6V.
Adopt the light valve assembly of capable of regulating infrared light penetrance of the present invention, be greater than the twisted nematic liquid crystals of 952 nanometers by the wire grating polaroid collocation △ nd that uses a pair of wideband (380nm～2500nm) polarization ability, by the wire grating polaroid separately parallel the or quadrature of absorption axes adjust the penetrance of infrared light.Than prior art, light valve assembly of the present invention can realize by the regulation and control of driving voltage the incident light full frequency band by the visible ray in, incident light by and infrared light by, incident light full frequency band, do not pass through penetrate frequency spectrum.Thus, the user can, by light valve assembly of the present invention in the situation that the visible ray all-pass is crossed, adjust the penetrance of infrared light independently.
The accompanying drawing explanation
The reader, after the reference accompanying drawing has been read the specific embodiment of the present invention, will become apparent various aspects of the present invention.Wherein,
What Fig. 1 illustrated that existing light valve assembly adopts the twisted nematic liquid crystals box penetrates spectrum curve figure;
Fig. 2 illustrates according to one embodiment of the present invention, and the structure of the light valve assembly of capable of regulating infrared light penetrance forms schematic diagram;
Fig. 3 illustrates the light valve assembly of Fig. 2 when not adding the twisted nematic liquid crystals box, wire grating polaroid absorption axes separately parallel with quadrature lower measured penetrate spectrum curve figure;
Fig. 4 illustrates the light valve assembly of Fig. 2 after adding the twisted nematic liquid crystals box, and wire grating polaroid absorption axes separately is parallel penetrates spectrum curve figure with lower that measured, under different driving voltage many of quadrature;
Fig. 5 (a)～Fig. 5 (c) illustrates respectively the corresponding wavelength of each curve of Fig. 4-penetrance curve.
Embodiment
For technology contents that the application is disclosed is more detailed and complete, can be with reference to accompanying drawing and following various specific embodiments of the present invention, in accompanying drawing, identical mark represents same or analogous assembly.Yet those of ordinary skill in the art should be appreciated that the embodiment that hereinafter provided not is used for limiting the scope that the present invention is contained.In addition, accompanying drawing, only for schematically being illustrated, is not drawn according to its life size.
At first, light and the twisted nematic liquid crystals box of each main wave band are briefly introduced.Due to the vibration of the inner atom of material or molecule, all objects all can be ceaselessly outside radiated electromagnetic wave.Take sunshine as example, and it mainly is comprised of ultraviolet light zone (or being called ultraviolet ray), visible region and infrared light region (or being called infrared ray), and usually, ultraviolet ray accounts for 7% of solar radiation gross energy, and its wavelength coverage is between 200nm～380nm.Visible ray accounts for 50% of solar radiation gross energy, and its wavelength coverage, between 380nm～780nm, roughly comprises the light of purple, blue, blue, green, yellow, orange, red look.Infrared ray accounts for 43% of solar radiation gross energy, and its wavelength coverage is between 780nm～2500nm.As known as us, ultraviolet ray has serious harm, and UV radiation can injure human body, skin ambustion and eyes, but also can cause the weather stains such as leatherware, plastic cement; Infrared ray is the main source of heat, need be intercepted it, and rejection rate is more high better, that is penetrance is more low better.
In general, the twisted nematic liquid crystals box comprises a first substrate (as, upper substrate), a second substrate (as, infrabasal plate) and is filled in the liquid crystal layer between first substrate and second substrate.Wherein, first substrate also comprises community electrode, and second substrate also comprises a pixel electrode, if, while between common electrode and pixel electrode, not applying driving voltage, the direction of liquid crystal molecule is roughly parallel to this first substrate and second substrate; If apply enough driving voltages between common electrode and pixel electrode, the electric field that this driving voltage produces can make liquid crystal molecule rearrange and be approximately perpendicular to this first substrate and second substrate.Because the liquid crystal molecule after rearranging can't rotate, by first or the light of second substrate can be stopped by the penetrating shaft of the corresponding polaroid arranged.
What Fig. 1 illustrated that existing light valve assembly adopts the twisted nematic liquid crystals box penetrates spectrum curve figure.
With reference to Fig. 1, state 1 is 0V, the twisted nematic liquid crystals box situation while presenting light corresponding to driving voltage, and state 2 is 6V, the twisted nematic liquid crystals box situation while presenting dark corresponding to driving voltage.For example, the twisted nematic liquid crystals box is in the situation that added electric field not, incident light is through entering liquid crystal layer after a polaroid, light beam is by the liquid crystal layer 90-degree rotation of liquid crystal molecule twisted arrangement, while leaving this liquid crystal layer, its polarization direction is just consistent with the polarization direction of another polaroid, so incident light can pass through smoothly, thereby presents bright state.Similarly, when add electric field (as, in the time of 6V), the optical axis of each liquid crystal molecule in liquid crystal layer turns to consistent with direction of an electric field, therefore liquid crystal layer has lost the ability of optically-active, result is from the be orthogonal relation of (or vertical) of the polarization direction of the light beam of this polaroid and the polarization direction of another polaroid, thereby incident light can't pass through smoothly, thereby presents dark state.
As can be seen from Figure 1, when driving voltage is 0V, the penetrance of the visible ray of wavelength 380nm～780nm is between 0.2 to 0.4, and wavelength is greater than the penetrance of infrared light of 780nm higher than 0.4.When driving voltage is 6V, the penetrance of the visible ray of wavelength 380nm～780nm is almost 0, that is now visible ray can't penetrate conventional polaroid.In addition, from Fig. 1, also easily know, no matter whether apply driving voltage, during polaroid that this twisted nematic liquid crystals box is arranged in pairs or groups conventional, all can't adjust the penetrance of infrared light.
Fig. 2 illustrates according to one embodiment of the present invention, and the structure of the light valve assembly of capable of regulating infrared light penetrance forms schematic diagram.
With reference to Fig. 2, light valve assembly of the present invention comprises a twisted nematic liquid crystals box 10 and two wire grating polaroids 20,30.For example, wire grating polaroid 20 is positioned at the place ahead of twisted nematic liquid crystals box 10, and wire grating polaroid 30 is positioned at the rear of twisted nematic liquid crystals box 10.
More specifically, wire grating polaroid 20 has one first absorption axes 202.This wire grating polaroid 20 is in order to receive from outside incident light L1, and forms one first light beam P1.Twisted nematic liquid crystals box 10 is in order to receive the first light beam P1 from wire grating polaroid 20.Twisted nematic liquid crystals box 10 is electrically coupled to a driving voltage V, and utilizes this driving voltage V to control the orientation of its liquid crystal molecule, with the first light beam P1 by being received, is converted into one second light beam P2.Wire grating polaroid 30 has one second absorption axes 302.Light valve assembly of the present invention, by the parallel or quadrature between the first absorption axes 202 and the second absorption axes 302, is converted to the second light beam P2 output beam L2 and adjusts the infrared light penetrance in output beam L2.
In one embodiment, this light valve assembly is adjusted the infrared light penetrance by the parastate between the first absorption axes 202 and the second absorption axes 302.Replacedly, in another embodiment, this light valve assembly is adjusted the infrared light penetrance by the quadrature between the first absorption axes 202 and the second absorption axes 302.
In one embodiment, twisted nematic liquid crystals box 10 comprises the nematic liquid crystal of positive dielectric anisotropy.Preferably, the refractive index anisotropy of this nematic liquid crystal (Δ n) is greater than 952 nanometers (nm) with the product Δ nd of the thickness of liquid crystal layer (d) of liquid crystal cell.
In addition, wire grating polaroid 20 and 30 polarization ability contain wider wavelength band.For example, the wavelength coverage of incident light is between 380nm～2500nm, that is to say, by wire grating polaroid 20 and 30 and the twisted nematic liquid crystals box, all can be adjusted the infrared light penetrance in output beam at whole visible light wave ranges and infrared band.
Fig. 3 illustrates the light valve assembly of Fig. 2 when not adding the twisted nematic liquid crystals box, wire grating polaroid absorption axes separately parallel with quadrature lower measured penetrate spectrum curve figure.Fig. 4 illustrates the light valve assembly of Fig. 2 after adding the twisted nematic liquid crystals box, and wire grating polaroid absorption axes separately is parallel penetrates spectrum curve figure with lower that measured, under different driving voltage many of quadrature.
With reference to Fig. 3, when state 1, the light that wavelength is 380nm to 2500nm is energy penetrating metal wiregrating polaroid all, and penetrance probably swings up and down 0.4.And, when state 2, the light beam that only wavelength is the 880nm left and right can pass through the wire grating polaroid, and the light beam of wavelength between 380nm to 880nm or between 880nm to 2500nm all can't pass through the wire grating polaroid.Hence one can see that, and the wire grating polaroid has played the effect of similar " band is logical to filter " for the light beam of wavelength 380nm to 2500nm.
Than Fig. 3, Fig. 4 penetrates spectrum curve corresponding to the situation that has added twisted nematic liquid crystals.As shown in Figure 4, when curve 1 is 6V corresponding to driving voltage, penetrate frequency spectrum, when curve 2 is 2.5V corresponding to driving voltage, penetrate frequency spectrum, and curve 3 corresponding to driving voltage be 0V(, do not apply driving voltage) time penetrate frequency spectrum.From curve 1, can find out, the light beam that wavelength coverage is 380nm to 1980nm all can not pass through the wire grating polaroid.From curve 3, can find out, the light beam that wavelength coverage is 380nm to 1980nm all can pass through the wire grating polaroid, and penetrance is approximately 0.5 left and right.
It needs to be noted, in light valve assembly of the present invention, as shown in the curve 2 of Fig. 4, when driving voltage is 2.5V, the visible ray penetrating metal wiregrating polaroid that wavelength is 380nm～780nm, its penetrance is roughly more than 0.3; Meanwhile, the infrared light that wavelength is 780nm～1980nm can not penetrating metal wiregrating polaroid.
Fig. 5 (a)～Fig. 5 (c) illustrates respectively the corresponding wavelength of each curve of Fig. 4-penetrance curve.
As shown in Fig. 5 (a), when driving voltage is 0V, incident light is with full frequency band mode penetrating metal wiregrating polaroid 30.That is the infrared light that the visible ray that, wavelength is 380nm～780nm and wavelength are 780nm～1980nm all can penetrating metal wiregrating polaroid.
As shown in Fig. 5 (b), when driving voltage is first voltage, the visible luminous energy penetrating metal wiregrating polaroid 30 that wavelength in incident light is 380nm～780nm, and the infrared light that the wavelength in incident light is 780nm～1980nm can't pass through wire grating polaroid 30.For example, the first voltage is 2.5V.Should be appreciated that in other embodiment, also the driving voltage of configurable other numerical value is realized infrared light and visible ray different penetrance separately.
And, in Fig. 5 (c), when driving voltage is a second voltage, in incident light, the light of all wave bands all can't penetrating metal wiregrating polaroid 30.For example, second voltage is 6V.Should be appreciated that in other embodiment, also the driving voltage of configurable other numerical value realizes that the full frequency band of infrared light and visible ray does not pass through.
Adopt the light valve assembly of capable of regulating infrared light penetrance of the present invention, be greater than the twisted nematic liquid crystals of 952 nanometers by the wire grating polaroid collocation △ nd that uses a pair of wideband (380nm～2500nm) polarization ability, by the wire grating polaroid separately parallel the or quadrature of absorption axes adjust the penetrance of infrared light.Than prior art, light valve assembly of the present invention can realize by the regulation and control of driving voltage the incident light full frequency band by the visible ray in, incident light by and infrared light by, incident light full frequency band, do not pass through penetrate frequency spectrum.Thus, the user can, by light valve assembly of the present invention in the situation that the visible ray all-pass is crossed, adjust the penetrance of infrared light independently.
Above, describe the specific embodiment of the present invention with reference to the accompanying drawings.But those skilled in the art can understand, in the situation that without departing from the spirit and scope of the present invention, can also do various changes and replacement to the specific embodiment of the present invention.These changes and replacement all drop in the claims in the present invention book limited range.
Claims (10)
1. the light valve assembly of a capable of regulating infrared light penetrance, is characterized in that, described light valve assembly comprises:
One first wire grating polaroid, have one first absorption axes, in order to receive from outside incident light, and forms one first light beam;
One twisted nematic liquid crystals box, in order to receive described the first light beam, described twisted nematic liquid crystals box is electrically coupled to a driving voltage, and utilizes described driving voltage to control the orientation of its liquid crystal molecule, so that described the first light beam is converted into to one second light beam; And
One second wire grating polaroid, there is one second absorption axes, parallel or quadrature by between described the first absorption axes and described the second absorption axes, be converted to described the second light beam output beam and adjust the infrared light penetrance in described output beam.
2. light valve assembly according to claim 1, is characterized in that, described twisted nematic liquid crystals box comprises the nematic liquid crystal of positive dielectric anisotropy.
3. light valve assembly according to claim 2, is characterized in that, the refractive index anisotropy of described nematic liquid crystal (Δ n) is greater than 952 nanometers with the product Δ nd of the thickness of liquid crystal layer (d) of described liquid crystal cell.
4. light valve assembly according to claim 1, is characterized in that, the wavelength coverage of described incident light is 380 nanometers～2500 nanometers.
5. light valve assembly according to claim 1, is characterized in that, when described the first absorption axes and described the second absorption axes, when orthogonal, described light valve assembly is adjusted the penetrance of described infrared light.
6. light valve assembly according to claim 5, is characterized in that, when described driving voltage is 0V, described incident light penetrates described the second wire grating polaroid in the full frequency band mode.
7. light valve assembly according to claim 5, it is characterized in that, when described driving voltage is first voltage, the visible ray in described incident light penetrates described the second wire grating polaroid, and the infrared light in described incident light can't pass through described the second wire grating polaroid.
8. light valve assembly according to claim 7, is characterized in that, described the first voltage is 2.5V.
9. light valve assembly according to claim 5, is characterized in that, when described driving voltage is a second voltage, in described incident light, the light of all wave bands all can't penetrate described the second wire grating polaroid.
10. light valve assembly according to claim 9, is characterized in that, described second voltage is 6V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101101626A CN103424920A (en) | 2013-04-01 | 2013-04-01 | Light valve component allowing adjustment of penetration rate of infrared light |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101101626A CN103424920A (en) | 2013-04-01 | 2013-04-01 | Light valve component allowing adjustment of penetration rate of infrared light |
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| CN103424920A true CN103424920A (en) | 2013-12-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093525A (en) * | 2014-05-08 | 2015-11-25 | 广达电脑股份有限公司 | electronic glasses |
| CN110622061A (en) * | 2017-06-02 | 2019-12-27 | 日本化药株式会社 | Light control device for infrared light region and visible light region |
-
2013
- 2013-04-01 CN CN2013101101626A patent/CN103424920A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093525A (en) * | 2014-05-08 | 2015-11-25 | 广达电脑股份有限公司 | electronic glasses |
| CN110622061A (en) * | 2017-06-02 | 2019-12-27 | 日本化药株式会社 | Light control device for infrared light region and visible light region |
| JPWO2018221598A1 (en) * | 2017-06-02 | 2020-04-02 | 日本化薬株式会社 | Infrared and visible light control devices |
| TWI763860B (en) * | 2017-06-02 | 2022-05-11 | 日商日本化藥股份有限公司 | Infrared and visible region light control apparatus |
| JP7111703B2 (en) | 2017-06-02 | 2022-08-02 | 日本化薬株式会社 | Infrared and visible light control device |
| CN110622061B (en) * | 2017-06-02 | 2022-09-27 | 日本化药株式会社 | Light control device for infrared light region and visible light region |
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Application publication date: 20131204 |