KR20190092799A - Method for manufacturing cholesteric liquid crystal film and electronic vehicle sun visor device using the same - Google Patents

Abstract

The present invention relates to a method for manufacturing a cholesteric liquid crystal film to realize a cholesteric liquid crystal film (cell) by mixing a chiral compound that can make a helical structure in a cholesteric liquid crystal or a chiral nematic liquid crystal, and to use this as a sun visor function to freely adjust transmittance or to realize various colors, and an electronic vehicle sun visor device using the same. The sun visor device for an electronic vehicle using a cholesteric liquid crystal film includes: an operation part for selecting a light transmission/scattering mode, inputting light transmission, blocking, and color adjustment signals; a control part for generating a light blocking amount and a color adjustment control signal in a light transmission/scattering mode by the operation part; a voltage adjustment part for adjusting and outputting a supply voltage for light blocking amount and color adjustment according to the light blocking amount and the color adjustment control signal generated from the control part; and a smart window provided with a cholesteric liquid crystal film for adjusting the light blocking amount and changing color according to the voltage output from the voltage adjustment part.

Description

Method for manufacturing cholesteric liquid crystal film and electronic vehicle sun visor device using the same}

The present invention relates to a method for manufacturing a cholesteric liquid crystal film and an electronic vehicle sun visor using the same, and in particular, a chiral compound that can make a helical structure in a cholesteric liquid crystal or a chiral nematic liquid crystal. To implement a cholesteric liquid crystal film (cell) and use it as a sun visor function to control the light transmittance freely or to implement a variety of colors cholesteric liquid crystal film manufacturing method and an electronic vehicle sun visor device using the same It is about.

Recently, smart technology has become a very important issue in the automobile industry for energy saving and passenger convenience. Even in the case of smart windows, consumer demand for functions as a tool for privacy and entertainment as well as response to the external environment is gradually increasing.

According to the demand of the consumer, the proposed technology is a smart window partially applied to some vehicles. Smart window is a technology that controls turbidity using polymer dispersed liquid crystal (PDLC) film.

On the other hand, the technique proposed conventionally about a smart window is disclosed by following <patent document 1>-<patent document 3>.

The prior art disclosed in <Patent Document 1> controls the driving power input to the liquid crystal panel according to the liquid crystal panel provided in the windshield glass or the side door glass of the vehicle, the optical sensor unit for sensing the amount of light, the optical sensor unit It is composed of an electronic control unit, the driver can prevent a visual disturbance caused by strong direct sunlight or ambient light while driving, it is possible to drive safely.

In addition, the prior art disclosed in <Patent Document 2> is a liquid crystal material in which the color component displayed by the power supply is changed, glass that accommodates the liquid crystal material and is disposed corresponding to the front, rear or left and right sides of the vehicle, the liquid crystal material A light shielding device for automobiles using a liquid crystal including a power supply for supplying power to the liquid crystal, and a control unit for controlling a light transmission amount of the liquid crystal material by adjusting a power supply from the power supply to the liquid crystal material. Through this configuration, the liquid crystal is used to improve the positional control and sun protection restrictions caused by the use of the sun visor, and the trouble of fixing the solar light and removing the film from the sunning. Therefore, it is possible to variably control the degree of solar light transmission of the vehicle glass and to help safe driving by varying the shading range.

In addition, the prior art disclosed in <Patent Document 3> is a smart sun visor including a plurality of light blocking filters for transmitting or blocking the light irradiated to the glass of the vehicle, the entire area that can be blocked by the smart sun visor And a light shielding region designation unit for designating a light shielding region for blocking the light, and a light shielding control unit for controlling the light shielding filter corresponding to the designated light shielding region among the plurality of light shielding filters to transmit or block light. Through such a configuration, a sun visor capable of designating a light shielding area for blocking light emitted to a glass of a vehicle and a light shielding system including the same are provided.

Republic of Korea Patent Publication No. 2003-0082113 (published Oct. 22, 2003) (light shielding device of vehicle using liquid crystal panel) Republic of Korea Patent Publication No. 10-2007-0064051 (June 20, 2007 published) (light shielding device for automobiles using liquid crystal) Republic of Korea Patent Publication No. 10-2017-0011750 (published Feb. 2, 2017) (Smart sun visor and shading system including the same)

However, the prior art as described above, but it is possible to block the sunlight or to adjust the amount of blocking by using a liquid crystal or light-shielding filter, there is a disadvantage that it is impossible to freely adjust the light transmittance or implement a variety of colors by the user.

Therefore, the present invention has been proposed to solve all the problems occurring in the prior art as described above, a chiral compound that can create a helical structure in the cholesteric liquid crystal or chiral nematic liquid crystal A cholesteric liquid crystal film (cell) is implemented by mixing, and this method is used as a sun visor function to control the light transmittance freely or to realize various colors. The purpose is to provide.

In order to achieve the object as described above, the cholesteric liquid crystal film manufacturing method according to the present invention is characterized by being prepared by mixing a chiral mixture in the cholesteric liquid crystal.

The chiral mixture is characterized in that the mixture having a structure represented by the formula (1).

In Chemical Formula 1,

Ch is a compound having a chiral carbon, R is a C _1-30 hydrocarbon compound, PMS is a photo-responsive mesogen compound, and m and n are each an integer of 1 to 10.

In addition, the electronic vehicle sun-bai storage using the cholesteric liquid crystal film according to the present invention, the operation unit for selecting the transmission / scattering mode of light, and inputs the transmission, blocking, color control signal of the light; A control unit for generating a light blocking amount and a color control control signal in a light transmission / scattering mode by the operation unit; A voltage adjusting unit adjusting and supplying a supply voltage for controlling the light blocking amount and the color according to the light blocking amount and the color control control signal generated by the controller; It characterized in that it comprises a smart window provided with a cholesteric liquid crystal film for adjusting the blocking amount of light and changing the color according to the voltage output from the voltage adjusting unit.

The control unit generates a light blocking amount and a color control control signal only in a light transmission / scattering mode, thereby reducing power consumption.

The smart window is characterized in that the cholesteric liquid crystal film is embedded in the glass form on the glass window or the cholesteric liquid crystal film is attached.

The cholesteric liquid crystal film is characterized by adjusting the color implementation and light transmittance through the selective light reflection of the visible light region by adjusting the pitch according to the applied voltage.

The cholesteric liquid crystal film is prepared by mixing a chiral mixture in a cholesteric liquid crystal, the chiral mixture is characterized in that the mixture having a structure represented by the following formula (1).

In Chemical Formula 1,

Ch is a compound having a chiral carbon, R is a C _1-30 hydrocarbon compound, PMS is a photo-responsive mesogen compound, and m and n are each an integer of 1 to 10.

According to the present invention, a cholesteric liquid crystal film (cell) is embodied by mixing a chiral compound capable of forming a helical structure in a cholesteric liquid crystal or a chiral nematic liquid crystal. It can be used to freely adjust the light transmittance or to realize various colors.

In addition, according to the present invention by generating a voltage for light blocking amount and color control only in the light transmission / scattering mode, there is an advantage that the overall power consumption can be reduced.

1 is a block diagram of an electronic vehicle sun visor device using a cholesteric liquid crystal film according to the present invention;
2 is an exemplary view of implementing an electronic vehicle sunbaby storage device using a cholesteric liquid crystal film according to the present invention;
Figure 3 is a state change diagram according to the voltage applied to the cholesteric liquid crystal film according to the present invention.

Hereinafter, a cholesteric liquid crystal film according to a preferred embodiment of the present invention and an electronic vehicle sunbai storage device using the same will be described in detail with reference to the accompanying drawings.

The present invention applies a cholesteric liquid crystal film (cell) made of cholesteric liquid crystal to the windshield of the vehicle (especially the upper), the vehicle sun-bai storage to enable light transmission and color control according to the application of voltage To provide.

A cholesteric liquid crystal film is realized by mixing a cholesteric liquid crystal or chiral nematic liquid crystal with a chiral compound capable of forming a helical structure.

For example, the cholesteric liquid crystal film (cell) is preferably prepared by mixing a chiral mixture with a known cholesteric liquid crystal.

The chiral mixture is a mixture having a structure represented by the following <Formula 1>.

In <Formula 1>,

Ch is a compound having a chiral carbon and may have a molecular weight of 100 to 10,000 g / mol. R is a C _1-30 hydrocarbon compound, wherein a linear alkyl group, branched alkyl group, alkenyl group, alkoxy group, ether group, fluoroalkylene group, fluoroether group, C _3-12 cycloalkyl group and one or more carbon thereof are O , S, N or F may be any one selected from the group consisting of compounds. PMS is a photo-responsive mesogen compound, m and n are each an integer of 1 to 10.

The chiral mixture prepares a hydrocarbon compound (Rm), prepares a photoreactive mesogen compound (PMS), and reacts the PMS with a functional group that binds to PMS at the Rm end to prepare an Rm-PMS compound. The chiral compound (Ch) may be prepared by reacting the reacted Rm-PMS compound.

The functional groups that bind to PMS at the Rm terminus may be -CH3, -OH, -Br, -Cl, -COOH, -I, -NO2, and -NH2.

The cholesteric liquid crystal has been spotlighted as a display material because of its excellent color reproducibility, variability, and selective reflection characteristics. In the case of the cholesteric liquid crystal, the light transmission and scattering mode driving is possible according to the application of the voltage, thereby enabling the shutter function to turn on / off the light. Unlike conventional PDLC, since voltage is applied only when switching to a mode (transmission / scattering mode), the state is maintained even when the voltage is removed. Therefore, it can operate in transparent and scattering mode without additional power consumption. . Furthermore, the repetition period of the spiral structure, that is, the pitch, can be adjusted at a relatively low low voltage, so that selective reflection control of visible light can be controlled, so that various colors can be displayed with a single composition or the light transmittance of the smart window can be freely controlled. Can be.

By applying the cholesteric liquid crystal film (cell) manufactured as described above to the windshield of the vehicle to implement a sun visor device.

1 is a block diagram of a sun visor device for an electronic vehicle using a cholesteric liquid crystal film according to the present invention, which selects a transmission / scattering mode of light and inputs a light transmission, blocking, and color control signal ( 10), the control unit 20 for generating a light blocking amount and color control control signal in the light transmission / scattering mode by the operation unit 10, the voltage supply unit 20 for supplying a voltage for light blocking and color implementation According to the light blocking amount and the color control control signal generated by the control unit 20, the voltage adjusting unit 30 adjusts and outputs the supply voltage to adjust the light blocking amount and color control, and outputs from the voltage adjusting unit 30. It includes a smart window 40 is provided with a cholesteric liquid crystal film 41 for adjusting the blocking amount of light and changing the color according to the voltage.

The control unit 20 may generate a light blocking amount and a color control control signal only in a light transmission / scattering mode to lower power consumption, and the smart window 40 is a cholesteric liquid crystal film 41 on a glass window. It is preferable that the cell form or be embedded in the cholesteric liquid crystal film 41 is attached.

In addition, the cholesteric liquid crystal film 41 may be configured to selectively reflect light in the visible light region through a repetition period of the spiral structure, that is, pitch, according to an applied voltage, thereby controlling color implementation and light transmittance.

The operation of the electronic vehicle sun visor device using the cholesteric liquid crystal film according to the present invention configured as described above will be described in detail.

First, as shown in FIG. 2, a cholesteric liquid crystal film 41 embodied by mixing a chiral compound capable of forming a helical structure in a cholesteric liquid crystal or a chiral nematic liquid crystal is shown in FIG. Applies to a predetermined position of the smart window 40. Herein, the cholesteric liquid crystal film 41 is embedded in the smart window 40 in the form of a cell or the cholesteric liquid crystal film 41 is attached to implement a sun visor.

The cholesteric liquid crystal film 41 may make a sun visor cell having a color of R, G, and B at a relatively low voltage. When the cholesteric liquid crystal film 41 is applied to a low voltage, the cholesteric liquid crystal film 41 blocks light due to scattering. . At this time, even when the voltage is removed, the scattering phenomenon is maintained, thereby reducing power consumption. If you want to implement the transmission mode of the cell again, remove the voltage again after applying high voltage, the cell becomes transparent and reproduces the transmission mode.

Using the cholesteric liquid crystal film 41, a specific process of transmitting / blocking light, adjusting transmittance, or implementing color will be described.

A user (for example, a driver) operates an input means such as a button and / or a volume switch provided on the operation unit 10 to adjust or block light transmission, or to implement color, thereby controlling light transmission / scattering mode. Select and input the light transmission, blocking, and color adjustment signals.

When the light transmission / scattering mode is selected by the operation unit 10 and the light blocking amount and color are set, the control unit 20 determines the mode and light transmission amount and color selected by the user based on the control table stored in the internal memory. Corresponding control data is taken out, and the extracted control data is transmitted to the voltage adjusting unit 30 as a light blocking amount and color control control signal.

The voltage adjusting unit 30 receives a voltage for light blocking and color realization from the voltage supply unit 50, and then varies the supply voltage according to the light blocking amount and the color control control signal to supply the cholesteric liquid crystal film 41. ) Is applied. Then, the cholesteric liquid crystal film 41 transmits or scatters the light according to the applied voltage to adjust the light blocking amount and change the color.

For example, in a state in which the Cholesteric liquid crystal film 41 is implemented in a cell form and mounted on the upper end of the smart window 40, the liquid crystal alignment under planar state (PS) is not applied to a voltage as shown in FIG. 3. Maintain state. In this case, the pitch of the cholesteric liquid crystal is colorless and transparent corresponding to the wavelength region of the near UV. As the voltage is applied thereto, as the length of the pitch becomes longer, the reflected wavelength is shifted to a longer wavelength, thereby selectively reflecting light in the visible region. Therefore, by adjusting the voltage, the sun visor can be freely changed to red (R), green (G), and blue (B) according to the user's request.

The color change of R, G, and B occurs at a relatively low voltage, and it is possible to realize a color of B (1) at about 2V and R (3) at 6V. In addition, when a relatively high voltage of about 80V is applied (4), the liquid crystal stands perpendicular to the substrate and becomes a homeotropic (HS) state at the PS. At this time, if the voltage is lowered to a specific voltage of about 40V (5), the liquid crystal becomes a focal conic state (FS), which scatters light greatly and the cell becomes opaque. In this state, even if the voltage is removed to 0 V (6), the FS remains the same and the sun visor remains opaque without power consumption, and thus cannot transmit light. To change the cell back to transparent again, apply a high voltage (80V) again in FS (7) and immediately lower it to 0V (5a) to return to the original PS state and make the sunvisor transparent, as well as 2-6V. If you lower it as (5b ~ 5d), the color is implemented in R, G, B.

Therefore, the present invention can reduce the power consumption by applying a voltage only in the light transmission / scattering mode, and can also implement a color conversion of R, G, B with a relatively low voltage, so that the light transmission, blocking, Color adjustment is possible.

Although the invention made by the present inventors has been described in detail according to the above embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit and scope of the present invention. Self-evident to those who have

The present invention implements a sun visor using a cholesteric liquid crystal film in a vehicle, and is applied to a technology for performing light transmission, blocking, and color adjustment according to a user's request.

10: operation unit 20: control unit
30: voltage regulator 40: smart window
41: cholesteric liquid crystal film 50: voltage supply

Claims (7)

A method for producing a cholesteric liquid crystal film, which is prepared by mixing a chiral mixture with a cholesteric liquid crystal.
The method of claim 1, wherein the chiral mixture is a cholesteric liquid crystal film manufacturing method, characterized in that the mixture having a structure represented by the following formula.

In the above formula,
Ch is a compound having a chiral carbon, R is a C _1-30 hydrocarbon compound, PMS is a photo-responsive mesogen compound, and m and n are each an integer of 1 to 10.
An operation unit for selecting a light transmission / scattering mode and inputting light transmission, blocking, and color control signals;
A control unit for generating a light blocking amount and a color control control signal in a light transmission / scattering mode by the operation unit;
A voltage adjusting unit adjusting and supplying a supply voltage for controlling the light blocking amount and the color according to the light blocking amount and the color control control signal generated by the controller; And
Electronic vehicle sun visor device using a cholesteric liquid crystal film, characterized in that it comprises a smart window provided with a cholesteric liquid crystal film for controlling the amount of light blocking and changing the color according to the voltage output from the voltage adjusting unit.
The visor of claim 3, wherein the control unit generates a light blocking amount and a color control control signal only in a light transmission / scattering mode to reduce power consumption.
The visor of claim 3, wherein the smart window has a cholesteric liquid crystal film embedded in a cell window or the cholesteric liquid crystal film is attached to a glass window.
The cholesteric liquid crystal film of claim 3 or 5, wherein the cholesteric liquid crystal film adjusts color implementation and light transmittance by selectively reflecting light in the visible light region through pitch adjustment according to an applied voltage. Electronic vehicle sun visor device.
The cholesteric liquid crystal film of claim 3, wherein the cholesteric liquid crystal film is prepared by mixing a chiral mixture with a cholesteric liquid crystal, and the chiral mixture is a mixture having a structure represented by the following formula: Electronic car sun visor device using.

In the above formula,
Ch is a compound having a chiral carbon, R is a C _1-30 hydrocarbon compound, PMS is a photo-responsive mesogen compound, and m and n are each an integer of 1 to 10.

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