CN107422563B - A kind of variable color light adjustment intelligent window and light adjustment method - Google Patents

Abstract

The invention relates to a color-light-adjustable intelligent window and a light adjusting method, wherein the intelligent window comprises: the power supply comprises two opposite light-transmitting substrates (1) and filler filled between the two light-transmitting substrates (1), wherein the two light-transmitting substrates (1) are respectively connected with two poles of a power supply component (2); the filler is filled with a dielectric fluid (3); one surface of the two light-transmitting substrates (1) which is in contact with the dielectric fluid (3) is attached with liquid crystal scales (4). The liquid crystal scales are directly driven to deflect by changing the voltage of the power supply, and different reflection wave bands are reversibly adjusted, so that the purpose of adjusting the color-variable light of the intelligent window is achieved.

Description

A kind of variable color light adjustment intelligent window and light adjustment method

technical field

The invention relates to a color-changing light-adjusting smart window and a light-adjusting method.

Background technique

Most of the dimming glass is coated on the glass surface to make a certain wave of light reflected or transmitted by the glass window, but the coated window will interfere with communication and navigation, and the adjustment of the coated window is irreversible. The current dimming Glass also cannot completely satisfy personal preferences to change color at will and adapt to our country's climate.

(

为液晶的平均光折射率，θ为光的入射角)决定，当P值一定时，改变θ可以改变反射波段，即改变胆甾相液晶薄膜的倾斜角度即可改变反射光的波段；反射光谱带宽由公式Δλ＝(n_e-n_o)×P＝Δn×P(Δn＝n_e-n_o为双折射率)决定。液晶的这两个性能足以满足液晶智能窗对个人喜好和对我国气候的要求，但上述方法必须通过改变光的入射角才能改变智能窗的反射颜色。The cholesteric liquid crystal material has the characteristic of selective reflection due to its special helical structure. This special optical property makes the cholesteric liquid crystal widely used in the field of smart windows. The reflection wavelength of a cholesteric liquid crystal with a single pitch is given by the formula

(

is the average light refractive index of the liquid crystal, θ is the incident angle of light), when the P value is constant, changing θ can change the reflection band, that is, changing the tilt angle of the cholesteric liquid crystal film can change the reflected light band; reflection spectrum The bandwidth is determined by the formula Δλ=( _{ne −no} )×P=Δn×P (Δn= _{ne −no} is birefringence). These two properties of the liquid crystal are sufficient to meet the personal preferences of the liquid crystal smart window and the requirements of my country's climate, but the above method must change the reflection color of the smart window by changing the incident angle of light.

SUMMARY OF THE INVENTION

The present invention provides a color-changing light-adjusting smart window to solve the technical problem that the existing color-changing light-adjusting smart window must be changed by changing the incident angle of light.

In order to solve the above technical problems, the technical solution adopted in the present invention is: a color-changing light-adjusting smart window, comprising: two opposite light-transmitting substrates (1) and filling between the two light-transmitting substrates (1) The filler, characterized in that the two light-transmitting substrates (1) are respectively connected to the two poles of the power supply assembly (2); the filler is filled with a dielectric fluid (3); the two light-transmitting substrates ( Liquid crystal flakes (4) are attached to the surface of one of the 1) in contact with the dielectric fluid (3).

As a further improvement of the present invention, the light-transmitting substrate includes glass and ITO electrodes coated on the surface of the glass, the ITO electrodes are connected to the power supply assembly, and the ITO electrodes of the two light-transmitting substrates are arranged opposite to each other. A frame is arranged between the two light-transmitting substrates, and the frame encloses and encloses the dielectric fluid, thereby forming an interlayer.

As a further improvement of the present invention, the dielectric fluid is: 1,1,5,5-tetraphenyl-1,3,3,5-tetramethylsiloxane, propylene carbonate, glycidoxy Propyl terminated polydimethylsiloxane, or other suitable dielectric fluids that do not dissolve or swell the liquid crystal flakes.

As a further improvement of the present invention, the power supply assembly is equipped with a switch and a voltage regulating device.

As a further improvement of the present invention, the liquid crystal flakes are made of cholesteric liquid crystal polymer, and the liquid crystal flakes are regularly attached to the upper surface through the chemical connection layer on the upper surface of the lower glass substrate, and only the same side is attached on this surface.

As a further improvement of the present invention, according to weight percentage, the liquid crystal flakes are composed of 0-100% nematic liquid crystal A and/or 0-100% nematic liquid crystal B, 0-100% nematic liquid crystal C , 1.9-5.2% of chiral liquid crystal dopant, 0.5-2% of surfactant, 1-3% of light inducer and 200ppm-2% of polymerization inhibitor; the nematic liquid crystal A The structural formula is:

The structural formula of nematic liquid crystal B is:

The structural formula of nematic liquid crystal C is:

The structural formula of the chiral liquid crystal dopant is:

The photoinducing agent is phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, di-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone, benzoin Dimethyl ether or 1-hydroxycyclohexyl phenyl ketone. The polymerization inhibitor is p-cresol; the surfactant is N-ethyl perfluorooctanesulfonamidoethyl methacrylate.

The invention also discloses a method for adjusting color-changing light, which adopts the above-mentioned intelligent window for adjusting color-changing light, and the electric field connected through the light-transmitting substrate directly acts on the liquid crystal flakes to deflect them in one direction, thereby realizing the reflection of light in different wavelength bands. and transmission.

As a further improvement of the present invention, increase the access voltage to increase the deflection angle of the liquid crystal flakes, so that the reflection band shifts blue;

After the above technical solution is adopted, since the two light-transmitting substrates are respectively connected to the two poles of the power supply assembly (2); the filler is filled with a dielectric fluid; one of the two light-transmitting substrates is in contact with the surface of the dielectric fluid Attached with LCD scales. By changing the voltage of the connected power supply, the liquid crystal flakes can be directly driven to deflect, and different reflection bands can be adjusted reversibly, so as to achieve the purpose of adjusting the color and light of the smart window. The technical problem that the existing smart window with variable color light adjustment can only be changed by changing the incident angle of light is solved.

Description of drawings

The present invention will be further described below with reference to the accompanying drawings and embodiments.

1 is a schematic diagram of the overall structure of a variable color light-adjusting smart window;

2 is a schematic cross-sectional view of a variable color light-adjustable smart window when no driving voltage is applied;

3 is a schematic cross-sectional view of a variable color light-adjustable smart window when a driving voltage is applied;

FIG. 4 is a schematic diagram of the light of a specific wavelength band reflected by the variable color light adjustment smart window when no driving voltage is applied;

FIG. 5 is a schematic diagram of the light of a specific wavelength band reflected by the variable color light adjustment smart window when a driving voltage is applied.

FIG. 6 is a schematic diagram showing that the liquid crystal window reflects light of a specific wavelength band at different deflection angles.

Detailed ways

As shown in FIG. 1 , the electrically responsive variable color light-adjusting smart window includes two light-transmitting substrates 1 and a dielectric fluid 3 filled between the two light-transmitting substrates 1 . Liquid crystal flakes 4 are attached to the surface of one of the two light-transmitting substrates, that is, the lower light-transmitting substrate, which is in contact with the dielectric fluid.

Two light-transmitting substrates 1 are arranged opposite to each other, and the upper light-transmitting substrate 1 is composed of glass, ITO electrodes 5 coated on the glass surface, and a polyvinyl alcohol alignment layer 7 . The ITO electrodes 5 of the upper and lower light-transmitting substrates are arranged opposite to each other and are connected to the two poles of the power supply assembly 2 respectively. Therefore, when the two ITO electrodes 5 are energized, an electric field will be formed between the two light-transmitting substrates 1. related to the access voltage.

Several liquid crystal flakes 4 are attached to the upper surface of the lower glass substrate 1 through the chemical connection layer 8 to form a single-layer flake layer. In the initial state, as shown in FIG. 2 , the liquid crystal flakes 4 and the dielectric fluid 3 form a directional arrangement parallel to the light-transmitting substrate 1; after the light-transmitting substrate 1 is energized, the liquid crystal flakes 4 can be oriented and deflected under the action of an electric field, such as shown in Figure 3. The above-mentioned liquid crystal flakes 4 are formed by photolithography of a cholesteric liquid crystal mixture. The material of the liquid crystal flakes can be considered to use existing liquid crystals that can achieve the above functions, and can also be produced by the description in this article.

The regular attachment of the liquid crystal flakes 4 to the upper surface of the lower light-transmitting substrate on one side can be achieved by the following methods:

1) Configure mixed liquid crystal: under the condition of yellow light, mix nematic liquid crystal A, nematic liquid crystal B, nematic liquid crystal C, chiral dopant, photoinducing agent, surfactant and polymerization inhibitor in proportion Weigh it into the anti-ultraviolet reagent bottle, add a quantitative solvent and mix it evenly, and volatilize the mixed solution on a 65-degree hot stage for 2 hours to obtain a mixed liquid crystal; It can react with each component and be easily volatile; for example, dichloromethane can be used as a solvent.

2) Treatment of chemical bonding layer: After soaking the light-transmitting substrate in the treated 3-(methacryloyloxy)propyltrimethoxysilane solution for one hour at room temperature, bake it in an oven at 110 degrees for 2 hours to generate active bonding groups , the processing of the connection layer can be achieved in the following three ways:

① Cover the upper surface of the lower light-transmitting substrate 1 with a mask, and directly destroy the carbon-carbon double bonds at the non-attached position through the ultraviolet light source;

2. Soak the treated light-transmitting substrate in the solution of adding photoinitiator for 5 minutes, cover the upper surface of the lower light-transmitting substrate 1 with a mask plate, and destroy the carbon-carbon double bond in the non-attached position by the ultraviolet light source;

③ Add perfluorohexyl octyl acrylate to the connection layer, soak the treated light-transmitting substrate in the solution with photoinitiator for 5 minutes, cover the upper surface of the lower light-transmitting substrate 1 with a mask, and use the ultraviolet light source to The carbon-carbon double bonds at the non-attached positions are connected with inactive groups, and at the same time, a low surface energy surface is formed, preventing the complete attachment of the scales.

3) Preparation of liquid crystal flakes: under the room temperature of yellow light, the mixed liquid crystal is coated on the upper surface of the lower light-transmitting substrate 1 after a series of chemical treatments by means of blade coating, covering the mask plate, and under nitrogen gas. Under the environment, it is cured by ultraviolet light source for 2-10 seconds, and the intensity of the ultraviolet light source is between 20-30kw/cm ² . The cured lower light-transmitting substrate 1 is immersed in an ethanol solution to dissolve all the unreacted mixed liquid crystal monomers in the solution for development.

4) Thermal curing: Place the developed light-transmitting substrate on a 135-degree hot stage for 20 minutes of thermal curing.

As shown in FIG. 1 , a frame 6 is provided between the two light-transmitting substrates 1 , and the frame 6 encloses and encloses the dielectric fluid 3 and the liquid crystal flakes 4 , thereby forming an interlayer.

Generally speaking, as long as the ITO electrode 5 is connected to the voltage, the liquid crystal flakes 4 can be deflected, thereby changing the reflection band. In order to make the deflection angle adjustable, the connected voltage can be changed. The smaller the electric field is, the smaller the deflection angle of the liquid crystal flakes 4 is, and vice versa. Then, the power supply assembly 2 of this embodiment is equipped with a switch 21 and a voltage regulating device.

Specifically, the power supply assembly 2 may include a power supply in which a voltage regulating device is integrated to make the voltage of the power supply controllable, two ITO electrodes 5 are connected to the two poles of the power supply, and a switch 21 is connected to the power supply in series. Through the on/off of the switch 21 and the control of the power supply voltage, different voltages can be applied to the light-transmitting substrate 1 to form an electric field, and the liquid crystal flakes 4 are deflected under the action of the electric field, so as to realize the reflection and reflection of light in different wavelength bands. Transmission control.

Of course, the form of the voltage regulating device can be various, for example, the voltage regulation can be realized by connecting a sliding rheostat in series with the power supply.

Referring to FIG. 5 , when the voltage between the two light-transmitting substrates 1 is added to a certain value, the liquid crystal flakes 4 are deflected by nearly 90 degrees, and the smart window transmits light in almost all wavelength bands.

The above-mentioned variable color light-adjusting smart window directly acts on the liquid crystal flakes 4 through the electric field connected to the light-transmitting substrate 1, and deflects them unidirectionally, so as to realize the reflection and transmission of light of different wavelength bands. Specifically, increasing the access voltage increases the deflection angle of the liquid crystal flakes 4, thereby making the reflection band blue-shift; decreasing the access voltage reduces the deflection angle of the liquid crystal flakes 4, thereby making the reflection band red-shift.

The color-changing light-adjusting smart window can adjust the reflectivity and transmittance of light in different wavelength bands according to people's wishes, so as to satisfy one's own preferences and at the same time achieve the effect of being warm in winter and cool in summer. As a new type of smart window, It has the characteristics of innovation, green, environmental protection and energy saving.

Claims (7)

1. A color-changing light-adjusting smart window, comprising: two opposite light-transmitting substrates (1) and fillers filled between the two light-transmitting substrates (1), characterized in that the two light-transmitting substrates (1) are The light-transmitting substrates (1) are respectively connected with the two poles of the power supply assembly (2); the filler is a dielectric fluid (3); one of the two light-transmitting substrates (1) is connected to the dielectric fluid (3). ) is attached with liquid crystal flakes (4) on the contact surface, the liquid crystal flakes are photoetched from a cholesteric liquid crystal mixture, and the specific steps of the liquid crystal flakes photoetched from a cholesteric liquid crystal mixture are: Under the condition of room temperature, the mixed liquid crystal is coated on the upper surface of the lower light-transmitting substrate after a series of chemical treatments by scraping, covering the mask, and curing it by an ultraviolet light source in a nitrogen environment. The lower light-transmitting substrate is immersed in an ethanol solution, so that all the unreacted mixed liquid crystal monomers are dissolved in the solution to be developed and formed. 2. The variable color light-adjusting smart window according to claim 1, wherein the two light-transmitting substrates (1) comprise glass and an ITO electrode (5) coated on the surface of the glass, and the ITO electrode ( 5) Connect the power supply assembly (2), the ITO electrodes (5) of the two light-transmitting substrates (1) are arranged opposite to each other, and a frame (6) is arranged between the two light-transmitting substrates (1), and the frame (6) The dielectric fluid (3) is enclosed and enclosed, thereby forming an interlayer. 3. The variable color light-adjusting smart window according to claim 1 or 2, wherein the dielectric fluid (3) is: 1,1,5,5-tetraphenyl-1,3,3,5 - Tetramethylsiloxane, propylene carbonate, glycidoxypropyl terminated polydimethylsiloxane, or dielectric fluids that do not dissolve or swell liquid crystal flakes. 4 . The variable color light-adjusting smart window according to claim 1 , wherein the power supply assembly ( 2 ) is equipped with a switch ( 21 ) and a voltage adjusting device. 5 . 5. The color-changing light-adjusting smart window according to claim 1, characterized in that: the liquid crystal flakes are made of cholesteric liquid crystal polymer, and the liquid crystal flakes pass through the chemical reaction on the upper surface of the lower glass substrate (1). The connecting layers (8) are respectively regularly attached to the upper surface, and only the same side is attached to the surface. 6. The light-adjusting method of the variable color-changing light-adjusting smart window according to claim 1 or 2 or 4 or 5, characterized in that: the electric field connected to the light-transmitting substrate (1) directly acts on the liquid crystal flakes (4), so that the Its unidirectional deflection realizes the reflection and transmission of light in different wavelength bands. 7. The light-adjusting method of the variable color-changing light-adjusting smart window according to claim 6, characterized in that: increasing the access voltage increases the deflection angle of the liquid crystal flakes (4), so that the reflection band is blue-shifted; A voltage is applied to reduce the deflection angle of the liquid crystal flakes (4), so that the reflection wavelength band is red-shifted.

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