CN1184511C - Electrically controlled variable-wavelength filter and its prepearing process - Google Patents
Electrically controlled variable-wavelength filter and its prepearing process Download PDFInfo
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- CN1184511C CN1184511C CNB021118094A CN02111809A CN1184511C CN 1184511 C CN1184511 C CN 1184511C CN B021118094 A CNB021118094 A CN B021118094A CN 02111809 A CN02111809 A CN 02111809A CN 1184511 C CN1184511 C CN 1184511C
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Abstract
The present invention relates to an electric controlled variable wavelength filter and a preparing method thereof. A grating set is formed by superposition of three liquid crystal grating components with different spatial resolutions, and a liquid crystal layer between two pieces of glass substrates of the liquid crystal grating component is formed by adding the admixture of additive agents to the high polymer diffusive liquid crystal. Diffraction grating formed by the plane wave interference is arranged on the liquid crystal layer by using a laser holographic method, and holographic diffraction grating with various spatial resolutions is obtained on the liquid crystal layer, and then the liquid crystal components with different spatial resolutions are formed. The three liquid crystal grating components with different spatial resolutions are superposed together in an optical coupling method, and then the variable wavelength filter is formed. The filter of the present invention has simple structure, realizes the switchover among the red wavelength, the green wavelength and the blue wavelength by changing the time sequence on each liquid crystal grating component resulting from the electrical signals, and has the characteristics of quickness and low power consumption. No moving parts exist, which causes operation to be more reliable and is favourable for system miniaturization.
Description
Technical field:
The present invention relates to a kind of automatically controlled variable wavelength wave filter that is used for colour projection's device and preparation method thereof, belong to optical technical field.
Background technology:
Colour projection's device comprises orthogonal projection formula and back projection type TFT liquid crystal projector, LCOS projector and DLP projector etc. at present, useful monolithic or biplate liquid crystal (or LCOS, DMD) chip, and the mode of modulating with the time realizes colored the demonstration.Corresponding wavelength components is synchronous in this mode illumination wavelengths and the image.At present the method for using is with the optical filter filtration lighting source of a swiveling wheel with three-primary colours (R, G, B), makes R, G, the B visual chip that throws light on successively.This method has a lot of shortcomings, and the runner of employing can produce very big noise, influences audio visual effect; The runner method is difficult for reaching the illumination light wavelength and visual optical wavelength is synchronous; Runner can produce air-flow and heat, influences image quality.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, a kind of automatically controlled variable wavelength wave filter that is used for colour projection's device and preparation method thereof is provided, make the wave filter that makes higher diffraction efficiency be arranged to the light of different wave length, can realize the switching of three kinds of color wavelength of red, green, blue, have miniaturization, low in power consumption.
For realizing such purpose, in the technical scheme of the present invention, adopt the liquid crystal grating element stack of three different spatial resolutions, form the grating group, the liquid crystal grating element has two glass substrates that are coated with conducting film, and the high molecular polymer of 5-10 micron and the liquid crystal layer that the liquid crystal mixture constitutes are arranged in glass substrate.
The present invention sets up plane wave with the method for laser hologram or computer-generated hologram and interferes and the diffraction grating of formation on liquid crystal layer, make the liquid crystal hologram grating.Design different holographic recording optical paths can obtain the different spaces resolving power on liquid crystal layer holographic diffraction grating, make the liquid crystal grating element of different space frequency, be superimposed with the method for optical coupled liquid crystal grating element again, make the variable wavelength wave filter three different space frequency.The change electric signal is added in the sequential on each liquid crystal grating of wave filter, just can make the light beam of diffraction correspond respectively to redness (R), green (G) and blue (B).
The concrete steps that the present invention prepares the variable wavelength filtered method are as follows:
1, preparation liquid crystal grating element.Prepare two glass substrates that are coated with nesa coating, between glass substrate, irritate the potpourri that the high molecular polymer dispersed liquid crystal of 5～10 microns of one decks is arranged and add an amount of adjuvant, constitute liquid crystal layer.The potpourri that constitutes liquid crystal layer is made up of following chemical constitution:
Macromolecule polymer material 30%-65%
Supertwist liquid crystal or ferroelectric liquid crystals 30%-65%
Phenylglycine phenylglycine 1%-5%
Vinyl 1-viayl 1%-5%
Pyrrolidinyl 2-pyrrolidinone 1%-5%
Various composition percentage by weight sums should be 100%.
As separation layer, the gap between the control electro-conductive glass with vacuum draw or the method that coats, seals the edge of electro-conductive glass with said mixture, finishes the making to high molecular polymer dispersed liquid crystal box with the macromolecule membrane of micrometric measurement thickness.
2, on liquid crystal layer, set up plane wave with laser hologram technique and interfere and the diffraction grating of formation, make the liquid crystal hologram optical grating element.
Two bundles form interference fringe through the laser of collimator and extender at liquid crystal layer, and the spatial frequency f of its striped is determined that by formula tan θ=λ f wherein λ is an optical wavelength, and θ is the angle between the two bundle collimated laser beams.Because the effect of hardening agent in the liquid crystal layer makes high molecular polymer form at the bright fringes place of interference fringe and builds up, and forms grating.The degree of modulation of grating is determined by the refringence of liquid crystal layer time shutter and high molecular polymer and liquid crystal.This moment is when having light wave to pass through liquid crystal layer, owing to the effect of grating produces diffraction, when at electro-conductive glass in addition during alternating voltage, because the orientation change of liquid crystal molecule causes its variations in refractive index, when the refractive index of its refractive index and high molecular polymer is complementary, grating disappears, and diffraction does not take place incident light.Alternating voltage is 10V～100V, and its frequency is 50Hz～1000Hz.When removing voltage, grating restores to the original state.
3, use the liquid crystal grating of making different space frequency with the same method of step 2, make it have identical angle of diffraction corresponding to three kinds of wavelength of red, green, blue, its computing formula is λ=dsin Φ, and wherein λ is an optical wavelength, and Φ is an angle of diffraction.
4, with the optics coupling process three liquid crystal gratings are superimposed.
Make after the variable wavelength wave filter, can on three gratings, apply alternating voltage during use, remove the voltage of one of them in turn, just can realize to three wavelength light waves successively according to bright direction diffraction.
The present invention is simple in structure, adopts the superimposed variable wavelength wave filter of making of liquid crystal grating of three different spatial resolutions, is added in sequential on each liquid crystal grating element to change electric signal, realizes the switching of three kinds of color wavelength of red, green, blue.This brand-new design makes that wave filter has fast, low in power consumption, and because movement-less part, it is more reliable to make it work, and helps system's miniaturization.
Description of drawings:
Fig. 1 is the basic structure synoptic diagram of liquid crystal grating element of the present invention.
Among Fig. 1,1 is nesa coating, and 2 is liquid crystal layer, and 3 is glass substrate.
Embodiment:
For understanding technical scheme of the present invention better, be described further below in conjunction with accompanying drawing and specific embodiment.
Fig. 1 is the basic structure synoptic diagram of liquid crystal grating element of the present invention.
As shown in the figure, the liquid crystal grating element of variable wavelength wave filter of the present invention is made up of the liquid crystal layer 2 between two sheet glass substrates 3 and the glass substrate, be coated with nesa coating 1 on the glass substrate 3 respectively, liquid crystal layer 2 is made of 5～10 microns high molecular polymer dispersed liquid crystal and the potpourri that adds an amount of adjuvant.
Fig. 2 is the diffracted synoptic diagram of ruddiness in grating group of the present invention.
As shown in the figure, wave filter of the present invention is formed the grating group by three liquid crystal grating a, b, c, and when applying voltage on grating b, c, (R) is diffracted for ruddiness.
Fig. 3 is the diffracted synoptic diagram of green glow in grating group of the present invention.
As shown in the figure, wave filter of the present invention is formed the grating group by three liquid crystal grating a, b, c, and when applying voltage on grating a, b, (B) is diffracted for blue light.
Fig. 5 prepares the synoptic diagram of liquid crystal hologram optical grating element for the present invention.
As shown in the figure, the present invention's laser hologram technique is set up the plane wave interference and is formed diffraction grating on liquid crystal layer, make the liquid crystal hologram optical grating element.Laser object beam 5 and reference laser light light beam 6 through collimator and extender form interference fringe 4 at liquid crystal layer, and the spatial frequency f of interference fringe 4 is determined that by formula tan θ=λ f wherein λ is an optical wavelength, and θ is the angle between the two bundle collimated laser beams.Because the effect of hardening agent in the liquid crystal layer makes high molecular polymer form at the bright fringes place of interference fringe and builds up, and forms grating.The degree of modulation of grating is determined by the refringence of liquid crystal layer time shutter and high molecular polymer and liquid crystal.This moment is when having light wave to pass through liquid crystal layer, owing to the effect of grating produces diffraction, when on electro-conductive glass 3 in addition during alternating voltage, because the orientation change of liquid crystal molecule causes its variations in refractive index, when the refractive index of its refractive index and high molecular polymer is complementary, grating disappears, and diffraction does not take place incident light.
Embodiment:
Embodiment 1:
1, prepare the liquid crystal grating element, pour into the polymer dispersed liquid crystal material of 8 micron thickness in the electro-conductive glass substrate, its chemical constitution is
High molecular polymer 38%
Supertwist liquid crystal 59%
Phenylglycine phenylglycine 1%
Vinyl 1-viayl 1%
Pyrrolidinyl 2-pyrrolidinone 1%
2, use helium cadmium laser as light source, its wavelength is λ=441nm, make two bundle plane wave laser form 30 ° of angles, on liquid crystal layer, write down grating, make first liquid crystal grating element, the angle that changes two laser more respectively becomes 25 ° and 33.5 °, makes second and third liquid crystal grating element.
3, above-mentioned three liquid crystal gratings are superimposed, make automatically controlled variable wavelength wave filter.
Embodiment 2: prepare the liquid crystal grating element, pour into the polymer dispersed liquid crystal material of 10 micron thickness in the electro-conductive glass substrate, its chemical constitution is
High molecular polymer 59%
Supertwist liquid crystal 38%
Phenylglycine phenylglycine 1%
Vinyl 1-viayl 1%
Pyrrolidinyl 2-pyrrolidinone 1%
Make automatically controlled variable wavelength wave filter with above-mentioned steps 2,3 same methods.
Embodiment 3: prepare the liquid crystal grating element, pour into the polymer dispersed liquid crystal material of 5 micron thickness in the electro-conductive glass substrate, its chemical constitution is
High molecular polymer 48%
Supertwist liquid crystal 48%
Phenylglycine phenylglycine 1.5%
Vinyl 1-viayl 1.2%
Pyrrolidinyl 2-pyrrolidinone 1.3%
Make automatically controlled variable wavelength wave filter with above-mentioned steps 2,3 same methods.
Make after the variable wavelength wave filter, on three gratings, apply the alternating voltage of 100V, 50Hz, remove the voltage of one of them in turn, just can realize to three wavelength light waves successively according to bright direction diffraction, its switching time is less than 5 milliseconds.
Claims (2)
1, a kind of automatically controlled variable wavelength wave filter, it is characterized in that adopting the liquid crystal grating element stack of three different spatial resolutions, form the grating group, the liquid crystal grating element is made up of the liquid crystal layer (2) between two sheet glass substrates (3) and the glass substrate, be coated with nesa coating (1) on the glass substrate (3) respectively, liquid crystal layer (2) is made of 5～10 microns high molecular polymer dispersed liquid crystal and the potpourri that adds adjuvant, has write holographic diffraction grating in the liquid crystal grating element.
2, a kind of preparation method of automatically controlled variable wavelength wave filter is characterized in that comprising following concrete steps:
1) preparation liquid crystal grating element: the potpourri of irritating the high molecular polymer dispersed liquid crystal of 5～10 microns of one decks and adding an amount of adjuvant between two glass substrates that are coated with nesa coating constitutes liquid crystal layer, the potpourri that constitutes liquid crystal layer is made up of following chemical constitution: macromolecule polymer material 30%-65%, supertwist liquid crystal or ferroelectric liquid crystals 30%-65%, phenylglycine 1%-5%, vinyl 1%-5%, pyrrolidinyl 1%-5%, various composition percentage by weight sums are 100%, with the macromolecule membrane of micrometric measurement thickness as separation layer, gap between the control electro-conductive glass, with vacuum draw or the method that coats, said mixture is sealed the edge of electro-conductive glass, finish making high molecular polymer dispersed liquid crystal box;
2) setting up plane wave with laser hologram technique on liquid crystal layer interferes and the diffraction grating of formation, make the liquid crystal hologram optical grating element: adopt two bundles to form interference fringe at liquid crystal layer through the laser of collimator and extender, the spatial frequency f of its striped is determined by formula tan θ=λ f, wherein λ is an optical wavelength, θ is the angle between the two bundle collimated laser beams, high molecular polymer is formed at the bright fringes place of interference fringe build up, form grating;
3) use the liquid crystal grating of making different space frequency with the same method of step 2, make it have identical angle of diffraction corresponding to three kinds of wavelength of red, green, blue, its computing formula is λ=dsin Φ, and wherein λ is an optical wavelength, and Φ is an angle of diffraction;
4) with the optics coupling process three liquid crystal gratings are superimposed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021118094A CN1184511C (en) | 2002-05-23 | 2002-05-23 | Electrically controlled variable-wavelength filter and its prepearing process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021118094A CN1184511C (en) | 2002-05-23 | 2002-05-23 | Electrically controlled variable-wavelength filter and its prepearing process |
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| Publication Number | Publication Date |
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| CN1383025A CN1383025A (en) | 2002-12-04 |
| CN1184511C true CN1184511C (en) | 2005-01-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103217820B (en) * | 2013-04-22 | 2015-11-25 | 华为技术有限公司 | A kind of optical branching device of power adjustable |
| CN107924102A (en) * | 2015-08-21 | 2018-04-17 | 依视路国际公司 | Active optical filter for eyeglass |
| CN106940486B (en) * | 2017-04-25 | 2022-06-24 | 京东方科技集团股份有限公司 | Display device and display method thereof |
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