KR102095247B1 - Electronic vehicle sun roof device using cholesteric liquid crystal film - Google Patents

Abstract

The cholesteric liquid crystal or chiral nematic liquid crystal is mixed with a chiral compound that can create a helical structure, and a cholesteric liquid crystal film (cell) is realized. As a method for manufacturing a cholesteric liquid crystal film that can freely control or implement various colors, and a sunroof device for an electronic vehicle using the same, the light transmission / scattering mode is selected, and light transmission, blocking, and color adjustment signals are provided. A control unit for input, a control unit generating a light blocking amount and a color control control signal in the light transmission / scattering mode by the control unit, and a light blocking amount and a color adjustment according to the light blocking amount and color adjustment control signal generated by the control unit In order to control the supply voltage, the voltage regulator outputs and the collet that adjusts the amount of light blocking and changes the color according to the voltage output from the voltage regulator. An electronic vehicle sunroof device using a cholesteric liquid crystal film is implemented, including a sunroof window provided with a steric liquid crystal film.

Description

Electronic vehicle sun roof device using cholesteric liquid crystal film

The present invention relates to an electronic vehicle sunroof device using a cholesteric liquid crystal film, and in particular, a cholesteric liquid crystal or a chiral compound capable of forming a spiral structure in a chiral nematic liquid crystal. The present invention relates to a sunroof device for an electronic vehicle using a cholesteric liquid crystal film that implements a cholesteric liquid crystal film (cell) and utilizes it in a sunroof or sunshade to freely adjust light transmittance or enable various colors.

Recently, in the automotive industry, smart technology has become a very important issue for energy saving and passenger convenience. In the case of smart windows, consumers' demands for functions as a tool for privacy and entertainment as well as response to the external environment are gradually increasing.

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

On the other hand, conventionally proposed technologies for smart windows are disclosed in the following <Patent Documents 1> to <Patent Documents 4>.

In the prior art disclosed in <Patent Document 1>, a smart glass window 1 having an electrochromic material whose transparency changes according to an applied voltage, and a solar cell unit supplying power to the smart glass window 2 (2), it comprises a power supply unit (3) for supplying electricity produced by the solar cell unit (2) to the smart window. Through this configuration, it is installed on the roof of the vehicle to provide a sunroof that can be adjusted to allow external light or air to enter the vehicle.

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

In addition, the prior art disclosed in <Patent Document 3> 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 It implements a light-shielding device for a vehicle using a liquid crystal including a power supply for supplying power to the power supply, and a control unit for controlling light supply of the liquid crystal material by controlling power supply from the power supply to the liquid crystal material. Through such a configuration, liquid crystal is used to improve the hassle of fixing the position of the sun light transmitted when using a sun visor, limiting the position of the sun when using a sun visor, and using a sunting film and fixing the sun transmittance. Therefore, it is possible to variably control the degree of sunlight transmission of the car glass, and to help safe driving by variably controlling the shading range.

In addition, the prior art disclosed in <Patent Document 4> is a smart sun visor including a plurality of light-shielding filters for transmitting or blocking light irradiated to the glass of a vehicle, the entire area where light can be blocked by the smart sun visor Among them, a light blocking area designation unit for designating a light blocking area for blocking the light and a light blocking control unit for controlling a light blocking filter corresponding to the designated light blocking area among the plurality of light blocking filters to transmit or block light. Through such a configuration, there is provided a sun visor capable of designating a light blocking area for blocking light irradiated on the glass of a vehicle and a light blocking system including the same.

Republic of Korea Patent Publication 10-2014-0132025 (published on November 17, 2014) (Sunroof for vehicles using an electrochromic device and a method of supplying electricity to it) Republic of Korea Patent Application 2003-0082113 (published on October 22, 2003) (shielding device for vehicles using liquid crystal panel) Republic of Korea Patent Publication 10-2007-0064051 (published on June 20, 2007) (shielding device for automobiles using liquid crystal) Republic of Korea Patent Publication 10-2017-0011750 (released on February 02, 2017) (smart sun visor and shading system including the same)

However, the prior art as described above is possible to block the sunlight or to adjust the partial blocking amount by using a liquid crystal, a light-shielding filter, or an electrochromic device, but has a disadvantage in that it is impossible to freely control light transmittance or implement various colors by a user.

Therefore, the present invention has been proposed to solve various problems occurring in the prior art as described above, and a chiral compound capable of creating a spiral structure in a cholesteric liquid crystal or a chiral nematic liquid crystal. It provides a sunroof device for electronic vehicles using a cholesteric liquid crystal film that enables a cholesteric liquid crystal film (cell) by mixing and uses it for a sunroof to freely control light transmittance or realize various colors. There is a purpose.

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

The chiral mixture is characterized in that it is a 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 Mesogens compound, and m and n are integers of 1 to 10, respectively.

In addition, a sunroof device for an electronic vehicle using a cholesteric liquid crystal film according to the present invention includes an operation unit for selecting a light transmission / scattering mode and inputting light transmission, blocking, and color control signals; A control unit generating a light blocking amount and a color control control signal in the light transmission / scattering mode by the operation unit; A voltage adjusting unit for adjusting and outputting a supply voltage for adjusting light blocking amount and color according to the light blocking amount and color adjustment control signal generated by the control unit; It characterized in that it comprises a sunroof window provided with a cholesteric liquid crystal film to adjust the amount of light blocking and change the color according to the voltage output from the voltage control unit.

In the above, the control unit is characterized in that it generates a light blocking amount and a color control control signal only in the light transmission / scattering mode, thereby reducing power consumption.

In the above, the sunroof window is characterized in that the cholesteric liquid crystal film is embedded in a cell form or the cholesteric liquid crystal film is attached to all or part of the sunroof glass window.

In the above, the cholesteric liquid crystal film is characterized by selectively reflecting light in the visible light region through pitch adjustment according to an applied voltage to control color realization and light transmittance.

In the above, the cholesteric liquid crystal film is prepared by mixing a chiral mixture with a cholesteric liquid crystal, and the chiral mixture is characterized by being a mixture having a structure represented by Formula 1 below.

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 Mesogens compound, and m and n are integers of 1 to 10, respectively.

According to the present invention, a cholesteric liquid crystal film (cell) is realized by mixing a cholesteric liquid crystal or a chiral compound capable of forming a spiral structure in a chiral nematic liquid crystal, and applying this to a sunroof. It has the advantage of being able to freely adjust the light transmittance or to implement 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, the overall power consumption can be lowered.

1 is a block diagram of an electronic vehicle sunroof device using a cholesteric liquid crystal film according to the present invention;
Figure 2 is an exemplary view of an electronic vehicle sunroof device using a cholesteric liquid crystal film according to the present invention implemented in a vehicle,
3 is a state change according to the voltage application of 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 sunroof device using the same will be described in detail with reference to the accompanying drawings.

The present invention is to apply a cholesteric liquid crystal film (cell) made of a cholesteric liquid crystal to a sunroof glass of a vehicle, and to provide a sunroof device for a vehicle that enables light transmission and color control according to voltage application. .

The cholesteric liquid crystal or chiral nematic liquid crystal is mixed with a chiral compound capable of forming a spiral structure, thereby realizing a cholesteric liquid crystal film.

For example, a 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, a linear alkyl group, a branched alkyl group, an alkenyl group, an alkoxy group, an ether group, a fluoralkylene group, a fluoroether group, a C _3-12 cycloalkyl group, and one or more carbons of these are O , S, N or F may be any one selected from the group consisting of compounds substituted. PMS is a photo-responsive Mesogens compound, m and n are integers of 1 to 10, respectively.

The chiral mixture is prepared by preparing a hydrocarbon compound (Rm), preparing a photoreactive mesogen compound (PMS), and reacting the PMS with a functional group that is bound to PMS at the Rm end to prepare an Rm-PMS compound, It can be prepared by reacting the chiral compound (Ch) and the reacted Rm-PMS compound.

The functional group that is bound to PMS at the Rm terminal may be -CH3, -OH, -Br, -Cl, -COOH, -I, -NO2, and -NH2.

The cholesteric liquid crystal is receiving attention as a display material because it has excellent reproducibility, variability and selective reflection characteristics of colors, and thus can express excellent colors. In the case of a cholesteric liquid crystal, a light transmission and scattering mode can be driven according to voltage application, and thus a shutter function capable of turning on / off the light is possible. In addition, unlike the existing PDLC, since the voltage is applied only when the mode (transmission / scattering mode) is switched, the state is maintained even when the voltage is removed, so there is an advantage of driving in a transparent and scattering mode without additional power consumption. . Furthermore, it is possible to control the selective reflection of light in the visible light region because it is possible to adjust the repetition period of the spiral structure with a relatively low voltage, that is, the pitch, so that multiple colors can be displayed in a single composition or the light transmittance of the sunroof window is free. Can be adjusted.

The cholesteric liquid crystal film (cell) manufactured as described above is applied to a sunroof glass window of a vehicle to implement a sunroof device.

1 is a block diagram of a sunroof device for an electronic vehicle using a cholesteric liquid crystal film according to the present invention, an operation unit for selecting a light transmission / scattering mode and inputting light transmission, blocking, and color adjustment signals ( 10), a control unit 20 that generates a light blocking amount and a color control control signal in the light transmission / scattering mode by the manipulation unit 10, a voltage supply unit 30 that supplies a voltage for light blocking and color realization , The voltage control unit 40 for adjusting and outputting a supply voltage for adjusting the light blocking amount and color according to the light blocking amount and color adjustment control signal generated by the control unit 20, output from the voltage control unit 40 It includes a sunroof window 50 provided with a cholesteric liquid crystal film 51 that controls the amount of light blocking and changes color according to the voltage being applied.

Preferably, the control unit 20 lowers power consumption by generating a light blocking amount and a color control control signal only in the light transmission / scattering mode, and the sunroof window 50 is a cholesteric liquid crystal film 51 on a glass window. ) Is preferably embedded in a cell form or the cholesteric liquid crystal film 51 is attached.

In addition, it is preferable that the cholesteric liquid crystal film 51 selectively reflects light in the visible light region through pitch adjustment, that is, it adjusts color implementation and light transmittance according to the applied voltage.

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

First, as shown in FIG. 2, a cholesteric liquid crystal film 41 implemented by mixing a cholesteric liquid crystal or a chiral compound capable of forming a spiral structure in a chiral nematic liquid crystal, as illustrated in FIG. 2, a vehicle sunroof window It is applied to the predetermined position of (50). Here, the cholesteric liquid crystal film 51 is embedded in the cell form in the sunroof window 50 or the cholesteric liquid crystal film 51 is attached to the sunroof.

The cholesteric liquid crystal film 41 can make cells having R, G, and B colors at a relatively low voltage, and when high voltage is applied and lowered to a specific voltage, light is blocked due to scattering. At this time, even if the voltage is removed, the scattering phenomenon is maintained, so power consumption can be reduced. If you want to implement the transmission mode of the cell again, remove the voltage again after applying a high voltage to make the cell transparent and reproduce the transmission mode.

A specific process of transmitting / blocking light, adjusting transmittance, or implementing color using the cholesteric liquid crystal film 51 will be described below.

The user (for example, the driver) controls input light such as a button and / or a volume switch provided on the control unit 10 to adjust or block light transmittance or to implement color, and thereby transmit / disperse the light. Select and input the light transmission, blocking, and color adjustment signals.

When the light transmission / scattering mode is selected by the manipulation unit 10 and the light blocking amount and color are set, the control unit 20 determines the light transmission amount and color selected by the user based on the control table stored in the internal memory. The corresponding control data is fetched, and the fetched control data is transmitted to the voltage adjusting unit 40 as a light blocking amount and a color adjustment control signal.

The voltage control unit 40 receives a voltage for light blocking and color realization from the voltage supply unit 30, and then changes a supply voltage according to the light blocking amount and color control signal to cholesteric liquid crystal film 51 ). Then, the cholesteric liquid crystal film 51 transmits or scatters light according to the applied voltage to adjust the amount of light blocking and change the color.

For example, in the state in which the cholesteric liquid crystal film 51 is implemented in a cell form and mounted on the top of the sunroof window 50, as shown in FIG. 3, the liquid crystal alignment is planar state (at 0 V without voltage applied). PS) keep the state. In this case, the pitch of the cholesteric liquid crystal is a colorless and transparent state corresponding to the wavelength region of near ultraviolet (near UV). As the voltage is applied to this, as the length of the pitch increases, the reflected wavelength moves to a long wavelength to selectively reflect light in the visible region. Therefore, the voltage of the sunroof can be freely changed to red (R), green (G), and blue (B) according to the user's request by adjusting the voltage.

The color changes of R, G, and B are made at a relatively low voltage, and it is possible to implement B (1) at about 2V and R (3) at 6V. In addition, when a relatively high voltage of about 80V is applied thereto (4), the liquid crystal stands perpendicular to the substrate and becomes a homeotropic (HS) state in PS. At this time, when it is lowered to a specific voltage of about 40V (5), the liquid crystal becomes a focal conic state (FS), which greatly scatters light and the cell becomes opaque. In this state, even if the voltage is removed to 0V (6), the FS remains the same, and the cell remains opaque without power consumption, so that light cannot be transmitted. To change the cell back to the original transparent state, apply high voltage (80V) again in the FS state (7), then immediately lower it to 0V (5a), returning to the original PS state, as well as making the cell transparent to 2-6V When lowered, colors such as R, G, and B are implemented as in 5b to 5d.

Therefore, the present invention can reduce the power consumption by applying a voltage only in the light transmission / scattering mode, and the color conversion of R, G, and B can also be implemented at a relatively low voltage, so light transmission and blocking according to the user's request, The color can be adjusted.

The invention made by the present inventors has been described above in detail according to the above-described embodiments, but the present invention is not limited to the above-described embodiments and can be modified in various ways without departing from the gist thereof. It is obvious to those who have it.

The present invention is applied to a technology that implements a sunroof window using a cholesteric liquid crystal film in a vehicle to perform light transmission, blocking, and color adjustment according to a user's request.

10: control unit 20: control unit
30: voltage supply unit 40: voltage control unit
50: sunroof window 51: cholesteric liquid crystal film

Claims (7)

delete delete An operation unit for selecting a light transmission / scattering mode and inputting light transmission, blocking, and color adjustment signals;
A control unit generating a light blocking amount and a color control control signal in the light transmission / scattering mode by the operation unit;
A voltage adjusting unit for adjusting and outputting a supply voltage for adjusting light blocking amount and color according to the light blocking amount and color adjustment control signal generated by the control unit; And
It includes a sunroof window provided with a cholesteric liquid crystal film that adjusts the amount of light blocking and changes the color according to the voltage output from the voltage controller,
The control unit generates a light blocking amount and a color adjustment control signal only in the light transmission / scattering mode to lower power consumption,
The sunroof window is an electronic vehicle sunroof device using a cholesteric liquid crystal film, characterized in that a cholesteric liquid crystal film is attached to all or part of the glass window.
delete delete The method according to claim 3, The cholesteric liquid crystal film is for electronic vehicles using a cholesteric liquid crystal film characterized in that by selectively adjusting the pitch in accordance with the applied voltage to reflect the light in the visible light region to adjust the color implementation and light transmittance. Sunroof device. delete

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