KR101911485B1 - Optical system for head-up display and head-up display system - Google Patents

Abstract

According to the present invention, an optical system for a HUD includes: a base substrate positioned on the traveling path of an image display light and having a positive dielectric constant; and a switching shutter which is formed on the upper surface of the base substrate and changes the transmission of the image display light according to the change of a physical signal applied from the outside. It is possible to minimize the degradation of visibility due to external light.

Description

[0001] OPTICAL SYSTEM AND HUD SYSTEM FOR HUD [0002] BACKGROUND OF THE INVENTION [0003]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical system and a HUD system for a HUD (HEAD-UP DISPLAY), and more particularly to an optical system for a HUD (HUD), which minimizes visibility degradation due to external light, And a HUD system.

The first HUD system was developed for fighter aircraft, and the image display light is reflected from a combiner placed in front of the cockpit and incident on the pilot side, allowing the pilot to recognize various information by the image display light. In recent years, the HUD system has been actively applied to the automobile industry. By displaying the surrounding environment information and safety information necessary for driving the vehicle with the image of the front of the driver and superimposed on the scenery of the driver's view, the driver does not have to move his / So that the driving safety can be greatly improved.

1 is a reference diagram showing a conventional vehicle HUD system. Referring to FIG. 1, a vehicular HUD system 10 includes a video output device 11 and a reflection mirror 12. Here, the video output device 11 outputs video display light including various video information to the reflection mirror 12, and the video display light is reflected by the reflection mirror 12 and is reflected on the inner surface of the windshield 13 of the vehicle I will join. Here, the image display light reflected from the inner surface of the windshield 13 is incident on the sight line of the driver, and the image display light is recognized as a virtual image located at a position a certain distance from the outer surface of the windshield 13 to the driver.

In the conventional HUD system, when external light (such as solar light) is incident on the HUD optical system from the outer surface of the windshield 13, the external light is reflected and scattered by the HUD optical system and incident on the sight of the driver together with the image display light The visibility of the image display light may be lowered, for example, the user may feel fatigued in the eyes of the driver. 1, the sunlight incident on the outer surface of the windshield 13 is transmitted through the windshield 13, reflected by the reflecting mirror 12, and then incident on the inner surface of the windshield 13, The visual field of the image display light outputted from the display device 11 is reached together with the visibility of the driver.

Various prior arts have been provided to solve these problems. Japanese Patent No. 5,081,953 discloses a structure of a vehicular HUD system for preventing deterioration of visibility due to external light and includes a light refraction means for guiding external light incident on the HUD optical system to enter the inside surface of the housing surrounding the HUD system To solve these technical problems.

The prior art can be designed at a relatively low cost by adding a light refraction means to a conventional HUD system. However, it is possible to block only the external light incident on the external light at a predetermined angle, There arises a problem that the volume of the HUD system is increased when a rotating device is added to the optical refraction means.

In general, a HUD system for a vehicle is located inside a dashboard of a vehicle. Since a variety of electronic devices are located inside a dashboard, a space for a HUD system is very limited and a compact design is essential.

However, a design technique of a HUD system capable of preventing deterioration of visibility due to external light and capable of miniaturization has not been provided so far.

Japanese Patent No. 5,081,953

Disclosure of Invention Technical Problem [8] The present invention has been conceived to solve the above-described problems, and it is an object of the present invention to provide an HUD optical system and a HUD system capable of minimizing visibility degradation due to external light incident on an HUD system, .

Other objects of the present invention will become apparent from the following description of preferred embodiments.

According to an aspect of the present invention, an optical system for a HUD includes: a base substrate positioned on a traveling path of an image display light and having a positive dielectric constant; And a switching shutter which is formed on an upper surface of the base substrate and changes a transmission amount of the image display light according to a change of a physical signal applied from the outside.

In one embodiment, the switching shutter is formed on the upper surface of the base substrate, and the switching shutter may be a metal phase or an insulator phase, which is phase-transitioned to an insulator phase according to a change in a physical signal applied from the outside. (Metal-Insulator Transition material) film; And a nanostructure array having a negative dielectric constant and having a certain cross-sectional area and formed on the upper surface of the MIT film.

In one embodiment, the MIT film can be phase-transformed onto a metal phase or an insulator according to a change in at least one of light, temperature, and pressure applied from the outside.

In one embodiment, the switching shutter operates in an image output mode in which the image display light is transmitted when the MIT film is transferred to a metal phase in accordance with a change in a physical signal applied from the outside, And may operate in an image cutoff mode in which at least a part of the image display light is blocked when the transition occurs.

In one embodiment, the switching shutter sequentially operates in a video output mode and a video interruption mode in accordance with the control of the externally applied physical signal in units of a predetermined period, and switches from the video output mode to the next video output mode Can be made within a time range of a few ms or less.

In one embodiment, the nanostructure arrays may be spaced apart by a periodic unit.

In one embodiment, the nanostructure array may be formed of one of metal materials having a negative dielectric constant such as gold (Au), silver (Ag), and aluminum (Al).

In one embodiment, the MIT film may be formed of a thin film of VO ₂ material.

In one embodiment, the base substrate may be formed so that the shape surface of one side in which the image display light is incident has a three-dimensional shape concave in the other direction.

In one embodiment, the base substrate is formed on the lower surface of the switching shutter, and the first base substrate is formed such that the shape surface of the one direction in which the image display light is incident has a concave three-dimensional shape in the other direction; And a second base substrate formed on a lower surface of the first base substrate and having a shape in the other direction and having a convex shape in the other direction and corresponding to the shape of the first base substrate.

In one embodiment, the index of refraction of the first base substrate may be less than the index of refraction of the second base substrate.

In one embodiment, the first base substrate is formed of any one of water, SiO _2, and oil having a refractive index of 1.5 or less, and the second base substrate is formed of Al ₂ O ₃ , Si ₃ N ₄ and a refractive index exceeding 1.5 Oil, or the like.

According to another aspect of the present invention, an HUD system includes an image output device for outputting image display light; An optical system for HUD which is located on a traveling path of the image display light and changes a transmission amount of the image display light according to a change of an external physical signal; And a signal adjusting device for applying a physical signal to the optical system for HUD in a predetermined period.

In one embodiment, the optical system for the HUD includes: a base substrate having a positive dielectric constant; And a switching shutter which is formed on an upper surface of the base substrate and changes a transmission amount of the image display light according to a change of a physical signal applied from the outside.

In one embodiment, the image output device may be configured to be in close contact with a lower surface of a base substrate of an optical system for a HUD.

According to the present invention, an image is ON / OFF-outputted at a time of 65 msec or less that can be recognized as a continuous image by a person, and at least part of external light can be blocked according to the output control of the image, It is possible to minimize the visibility degradation due to the external light reflected by the eye box.

In addition, the optical system for HUD according to the present invention can be manufactured in a micro-sized size and can be constructed in close contact with an image display device, so that the HUD system according to the present invention can be designed in a very small size.

In addition, the present invention can enlarge or reduce image display light according to the design structure, and can be flexibly applied to various devices (e.g., a vehicle) on which the HUD system can be mounted.

FIG. 1 is a reference diagram for explaining a conventional HUD system.
2 is a reference diagram for explaining the HUD system according to the present invention.
3 is a reference diagram for explaining an HUD system according to an embodiment of the present invention.
4 is a reference diagram for explaining an optical system for a HUD according to an embodiment of the present invention.
5 and 6 are reference views for explaining the operation principle of an optical system for a HUD according to an embodiment of the present invention.
7 is a reference view for explaining an optical system for a HUD according to another embodiment of the present invention.
8 is a reference diagram for explaining an optical system for a HUD according to another embodiment of the present invention.
9 is a reference diagram for explaining embodiments of the nanostructure array according to the present invention.
10 to 12 are reference views for explaining the operation and effects of the HUD system according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The present invention relates to an optical system for a HUD and a HUD system. More particularly, the present invention relates to an optical system for a HUD that minimizes visibility degradation due to external light incident on the HUD system and reflected by an eye box, And a HUD system.

As a result of intensive efforts to solve the above-described problems, the inventors of the present invention have found that an optical system for a HUD is configured on the path of image display light outputted from a video output device, and a switching shutter, (E.g., sunlight) according to the phase transition of the switching shutter while allowing the image of the display screen to pass through the image display light at a recognizable level.

The HUD system and the HUD system according to the present invention are applied to a vehicle to illustrate the present invention. However, the present invention is not intended to limit the scope of the present invention.

Hereinafter, a HUD system including an optical system for a HUD according to the present invention and a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a reference diagram for explaining the HUD system according to the present invention.

2, the HUD system 100 according to the present invention includes a video output device 110, an optical system 120 for a HUD, and a signal conditioning device 130.

The video output device 110 corresponds to a device for outputting predetermined video display light and is connected to a video signal providing device (not shown) to generate video display light corresponding to a video signal and output it to the outside . For example, the video output device 110 may correspond to a liquid crystal display device.

The HUD optical system 120 corresponds to an optical device that is positioned on the path of the image display light output from the image output device 110 and transmits image display light. Here, the HUD optical system 120 can change the transmission amount of the image display light in accordance with the change of the physical signal applied from the outside. In one embodiment, the image output device 110 may be configured to be in close contact with the lower surface of the optical system 110 for the HUD. A detailed description of the structure and operation of the optical system 120 for HUD will be described later.

The signal conditioning device 130 corresponds to a device for applying a physical signal to the optical system 120 for HUD to control the operation of the optical system 120 for the HUD. Here, the signal conditioning apparatus 130 may apply a physical signal in units of a predetermined period. In one embodiment, the signal conditioning apparatus 130 may change at least one physical quantity of light, temperature, and pressure in units of a predetermined period to be applied to the optical system 120 for HUD.

The basic operation of the HUD system 100 according to the present invention is as follows.

The video output device 110 outputs video display light including various video information to the HUD optical system 120 side. Here, the HUD optical system 120 can change the transmission amount of the image display light according to the change of the physical signal applied from the signal adjustment device 130. [

In one embodiment, the optical system 120 for HUD operates in a video output mode for transmitting image display light in accordance with a change in a physical signal applied by the signal conditioning device 130, (Detailed operation principle will be described later). Here, when the HUD optical system 120 operates in the video output mode, the image display light output from the video output device 110 is transmitted through the HUD optical system 120 and is incident on the inner surface of the windshield 140 , The image display light reflected from the inner surface of the windshield 140 is incident on the line of sight of the driver. When the HUD optical system 120 operates in the image cutoff mode, only a small amount of the image display light passes through the optical system 120 for HUD and is incident on the driver's line of sight. That is, the image display light can be transmitted (ON) or blocked (OFF) under the control of the signal adjusting device 130.

In one embodiment, when the optical system 120 for the HUD is operated in the image output mode, the MIT film included in the optical system 120 for the HUD is transferred to the metal, and thus external light (e.g., sunlight) (The opposite side of the video output device) of the optical system 120 for HUD and enters the sight line of the driver via the windshield 140. [ When the HUD optical system 120 operates in the image cutoff mode, the MIT film included in the HUD optical system 120 is transferred onto the insulator, and the external light is not reflected from the outer surface of the HUD optical system 120 (More specifically, only a relatively small amount of external light is reflected as compared with the video output mode), and incidence to the driver's line of sight is blocked.

In the present invention, if the image display light is controlled to transmit through the optical system 120 for hud in units of time (within about 62.5 ms) to such an extent that the human eye can recognize it as a continuous image, The external light can not be incident on the line of sight of the driver during the time when the image display light is intercepted, thereby greatly reducing visibility due to external light. That is, the signal controller 130 controls the optical system 120 for hud to operate in sequence in the video output mode and the video cutoff mode, and the switching from the video output mode to the next video output mode is performed within a time range of 62.5 ms or less The driver can recognize the image as a continuous image and effectively block most of the external light.

In the HUD system according to the present invention, an additional optical device may be further provided on the optical path of the image display light. Referring to FIG. 3, the HUD system 300 may further include a reflection mirror 150 on the optical path of the image display light. FIG. 3 is a reference view for explaining the HUD system according to an embodiment of the present invention. . Here, the reflection mirror 150 may be configured as a free-form optical system for correcting the distortion of the image display light.

3 is not intended to limit the scope of the present invention and the HUD system including the video output device 110, the HUD optical system 120 and the signal conditioning device 130 according to the present invention is not limited to the optical device It is to be understood that the present invention is not limited thereto.

Hereinafter, the optical system 120 for a HUD according to the present invention will be described in more detail with reference to FIGS.

4 is a reference diagram for explaining an optical system for a HUD according to an embodiment of the present invention. Meanwhile, FIG. 4 shows the HUD optical system 120 arranged such that the image display device 110 is positioned in the lower direction and image display light is transmitted from the lower direction to the upper direction.

Referring to FIG. 4, the optical system 120 for the HUD may include a base substrate 121 and a switching shutter.

The base substrate 121 has a positive dielectric constant and, in one embodiment, may be formed of a dielectric. Here, the base substrate 121 may be formed of transparent materials, and may be formed of any one material of, for example, quartz (SiOx) or glass.

The switching shutter is formed on the upper surface of the base substrate 121 and changes the transmission amount of the image display light according to the change of the physical signal applied from the outside.

In one embodiment, the switching shutter includes a metal-insulator transition (MIT) film 122 formed on the upper surface of the base substrate 121, and a nanostructure formed on the upper surface of the MIT film 122 Array 123 as shown in FIG.

The MIT film 122 may undergo a phase transition to a metal phase or an insulator phase according to changes in external physical signals.

In one embodiment, the MIT film 122 may be formed of a material that undergoes phase transformation onto a metal phase or an insulator according to a change in at least one of light, temperature, and pressure applied from the outside.

In one embodiment, the MIT film 122 may be formed of a VO ₂ material.

The nanostructure array 123 has a negative dielectric constant and may be formed on the upper surface of the MIT film 122 with a certain cross-sectional area.

In one embodiment, the nanostructure array 123 may be formed of a metal material and may be formed of any one of gold (Au), silver (Ag), and aluminum (Al) Au).

In one embodiment, the nanostructure arrays 123 may be spaced apart in a constant period unit. FIG. 9 shows an optical system 120 for a HUD viewed from the top to the bottom, and an embodiment of the nanostructure array 123 will be described in more detail with reference to FIG.

Referring to FIG. 9A, the nanostructure array 123 is formed on the upper surface of the MIT film 122, and each of the nanostructures constituting the nanostructure array 123 has a predetermined thickness (about several tens of nanometers) And extend in the longitudinal direction and spaced apart from each other by a predetermined distance (about 100 nm level) in parallel with each other.

Referring to FIG. 9B, the nanostructure array 123 is formed on the upper surface of the MIT film 122, and each nanostructure constituting the nanostructure array 123 has a predetermined thickness (about several tens of nanometers) The branch may be formed in a hexahedron shape and may be spaced apart from each other by a predetermined length.

9 is an illustration for explaining the nanostructure array 123 according to an embodiment of the present invention. It is not intended to limit the design structure of the nanostructure array 123, and the surface plasmon resonance The shape, length, area, period, etc. of the nanostructure can be appropriately changed in order to adjust the transmittance of the image display light according to the development.

In one embodiment, a protective film may be formed on the upper surface of the switching shutter. For example, as shown in Fig. 7, SiO2 is provided on the upper portion of the switching shutter so that the exposed surface of the nanostructure array 123 exposed on the upper surface of the switching shutter and the exposed surface of the MIT film 122 can be protected. ₂ may be formed.

In one embodiment, the switching shutter operates in a video output mode that transmits image display light or operates in a video cutoff mode to block at least a portion of the video display light, in accordance with a change in the physical signal applied by the signal conditioning device 130 can do.

FIGS. 5 and 6 are views for explaining the principle of operation of the switching shutter in the image output mode and the image cutoff mode, respectively, according to an embodiment of the present invention. Is a reference diagram showing the difference in light transmittance. In order to clearly explain the operation principle of the present invention, the physical signal applied to the switching shutter corresponds to an optical signal.

Referring to FIG. 5, when an optical signal is applied to the switching shutter from the signal control device 130, the MIT film 122 of the switching shutter is transferred to the metal due to the physical properties of the material. Referring to FIG. 10, when the MIT film 122 is in a metal phase, light having a wavelength of about 633 nm can be transmitted at a level of about 45%, and when the image display light corresponds to a wavelength of about 633 nm, Passes through the hud optical system 120, and finally passes through the windshield 140 to enter the line of sight of the driver. At this time, the external light (e.g., sun light) is reflected from the upper surface of the MIT film 122, which is a metallic image, and enters the sight line of the driver via the wind shield 140. That is, when an optical signal is applied to the switching shutter and operates in the image output mode, the image display light and the external light are incident on the driver's line of sight.

Referring to FIG. 6, when an optical signal is not applied to the signal conditioning device 130, the MIT film 122 of the switching shutter is transferred onto the insulator due to physical properties of the material. Referring to FIG. 10, when the MIT film 122 is in an insulator phase, light having a wavelength of about 633 nm can be transmitted at a level of about 16%, which is about 1/3 . When the image display light corresponds to a wavelength of about 633 nm, image display light of about 2/3 level can be cut off as compared with the image output mode. At this time, the external light (e.g., sun light) is not reflected from the upper surface of the MIT film 122, which is an insulator, and the incidence of external light can be blocked by the operator's line of sight. That is, when no optical signal is applied to the switching shutter (image cutoff mode), most of the image display light is blocked and the external light can be completely blocked by the MIT film 122, which is an insulator phase.

At this time, as described above, the signal control device 130 controls the switching shutter to sequentially operate in the video output mode and the video cutoff mode, and the switching from the video output mode to the next video output mode is performed at a time of 62.5 ms or less The external light incident during the time of operating in the image cutoff mode can be blocked so as not to be incident on the operation side (that is, in the image output mode) The external light can be prevented from being incident on the driver side for a period of time other than the time for which the external light is incident), thereby minimizing visibility degradation due to external light.

Hereinafter, the principle of the switching shutter operating in the image cut-off mode according to an embodiment of the present invention will be described in more detail.

According to an embodiment of the present invention, the switching shutter blocks at least a part of the image display light due to the surface plasmon resonance (SPR) phenomenon.

Surface plasmon resonance (SPR) is a phenomenon that resonates with the incident light of a surface plasmon existing at the interface between a metal and a dielectric. The surface plasmon resonance (SPR) is a phenomenon that resonates with a surface plasmon and incident light, (Surface Plasmon Polaritons, SPPs) are formed, and the electromagnetic field is reduced exponentially in the vertical direction from the interface.

5, when an optical signal is applied from the signal controller 130 to the switching shutter, the MIT film 122 of the switching shutter is transferred to the metal due to the physical properties of the material, and the nanostructure array 123 Since the MIT films 122 are all metals, no surface plasmon resonance occurs at their interface.

Referring to FIG. 6, when an optical signal is applied to the switching shutter from the signal conditioning device 130, the MIT film 122 of the switching shutter is transferred onto the insulator due to the physical properties of the material, And the MIT film 122, which is an insulator, and the surface plasmon polariton is generated by the generated surface plasmon polariton to absorb and block a part of the incident display light incident from the lower part to the upper part.

That is, the difference in transmittance according to the metal-insulator phase transition shown in FIG. 10 depends on the occurrence of the surface plasmon resonance phenomenon, which can be controlled through external physical changes (e.g., presence or absence of optical signals).

On the other hand, the metal-insulator phase transition time of the MIT film 122 is less than 1 ps, and the decay time of the surface plasmon polariton is less than 100 ps, and the image output of the switching shutter according to the embodiment of the present invention The switching time of the mode-image cutoff mode can be determined by the collapse time of the surface plasmon polariton. According to an embodiment of the present invention, if the output mode of the switching shutter can be switched within a range of 62.5 ms or less, the driver can recognize the image information as a continuous image, so that the switching time of the image output mode- And only the operation time of each of the video output mode and the image cutoff mode through the control of the external light of several ms level is sufficient.

In one embodiment, the image output device 110 may be constructed in close contact with the bottom surface of the base substrate 121. In the conventional HUD system, since the light source and the optical system form a certain distance, the volume of the entire HUD system The optical system 120 for an HUD according to the present invention can be integrated with a light source (image display apparatus), and thus can realize the integration of a light source (image display apparatus) and an optical system. In addition, since the HUD optical system 120 according to the present invention can be designed in a very small size (micro level), the volume of the entire HUD system 100 can be drastically reduced as compared with the conventional technology, It is possible to improve the degree of design freedom in designing.

Hereinafter, a structure in which the optical system 120 for an HUD operates in an image enlargement mode or an image focusing mode according to an embodiment of the present invention will be described in detail with reference to FIGS. 4 and 8. FIG.

In one embodiment, the base substrate 121 may be formed such that the shape of one side in which the image display light is incident has a concave shape in the other direction. Referring to FIG. 4, the base substrate 121 may be formed to have a three-dimensional shape in which a downward shape surface in which the image output device 110 is located is concave upward. Here, when the base substrate 121 is formed to have a concave three-dimensional shape in the upward direction, the HUD optical system 120 can operate in the image enlargement mode.

11 is a reference diagram showing the result of computer simulation performed in accordance with the following conditions.

Separation period of nanostructure array: 100 nm

Fill factor of nanostructure arrays: 0.3

Thickness of the nanostructure array: 20 nm

Radius of base substrate: 4.5 um

Referring to FIG. 11A, when the base substrate 121 is formed to have a concave three-dimensional shape in the upward direction, when the MIT film 122 is transferred to the metal and the switching shutter operates in the video output mode, It can be confirmed that the image display light is spread and output with a predetermined angle in the upward direction. On the other hand, referring to FIG. 11 (B), it can be seen that most of the image display light is blocked when the MIT film 122 is transferred onto the insulator so that the switching shutter operates in the image cutoff mode.

In one embodiment, the base substrate is formed on the lower surface of the MIT film 122, and the first base substrate 121 (see FIG. 1) formed in such a manner that the one- -1) formed on the lower surface of the first base substrate 121-1, and the shape surface in the other direction has a convex shape in the other direction and is formed to correspond to the shape of the first base substrate 121-1 And a second base substrate 121-2. Referring to FIG. 8, the first base substrate 121-1 is formed to have a downwardly convex shape in the upward direction, and the second base substrate 121-2 has a convex shape in the other direction And may be formed to correspond to the shape of the first base substrate 121-1.

Here, when the base substrate is configured as described above, the optical system 120 for HUD can operate in the image focusing mode.

In one embodiment, the refractive index of the first base substrate 121-1 may be less than the refractive index of the second base substrate 121-2. Here, the first base substrate 121-1 is water, SiO _2, and a refractive index of 1.5 or less is formed in any of five days (Oil) one, the second base substrate 121-2 are Al ₂ O _3, SiN and the refractive index (Oil) exceeding 1.5 may be formed.

12 is a reference diagram showing a result of computer simulation performed under the following conditions.

Separation period of nanostructure array: 100 nm

Fill factor of nanostructure arrays: 0.3

Thickness of the nanostructure array: 20 nm

Radius of first base substrate: 4.5 um

First base substrate: water (refractive index 1.33)

Second base substrate: Al ₂ O ₃ (refractive index: 1.714)

12 (A), when the base substrate is formed of the first and second base substrates having the shapes shown in FIG. 8, the MIT film 122 is transferred to the metal, so that the switching shutter is switched to the image output mode When operating, it can be confirmed that the image display light is focused and output with a predetermined angle in the upward direction. On the other hand, referring to FIG. 12 (B), it can be seen that most of the image display light is blocked when the MIT film 122 is transferred to the insulator so that the switching shutter operates in the image cutoff mode.

That is, according to one embodiment of the present invention, the image display light can be enlarged or reduced according to the design structure of the base substrate, and can be output to various devices (e.g., a vehicle, etc.) on which the HUD system 100 can be mounted It can be applied flexibly.

It will be apparent to those skilled in the relevant art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. The appended claims are to be considered as falling within the scope of the following claims.

10: Conventional HUD system
11: Video output device
12: reflection mirror
13: Windshield
100, 200: HUD system
110: Video output device
120: Optical system for HUD
130: Signal conditioning device
140: Windshield
150: reflection mirror
121: Base substrate
121-1: a first base substrate
121-2: a second base substrate
122: MIT film
123: Nano structure array
124: protective film

Claims (15)

An optical system for a HUD (HUD), which is located on a traveling path of image display light,
A base substrate having a positive dielectric constant; And
A switching shutter which is formed on an upper surface of the base substrate and changes a transmission amount of the image display light according to a change of a physical signal applied from outside;
/ RTI >
The switching shutter
A metal-insulator transition material (MIT) film formed on an upper surface of the base substrate and phase-transitioning to a metal phase or an insulator phase according to a change in a physical signal applied from the outside; And an array of nanostructures having a negative dielectric constant and formed on the top surface of the MIT film with a certain cross-sectional area.
delete The method of claim 1, wherein the MIT film comprises
Wherein the phase shifts to a metal phase or an insulator phase according to at least one change in light, temperature and pressure applied from the outside.
The apparatus of claim 1, wherein the switching shutter
When the MIT film is transferred to a metal phase, the image display mode operates in an image output mode in which the image display light is transmitted when the MIT film is transferred to the insulator, Wherein the optical system is operated in a video interrupting mode for interrupting a video signal.
The apparatus of claim 4, wherein the switching shutter
The external signal is sequentially controlled in the video output mode and the video interruption mode as the externally applied physical signal is controlled in units of a predetermined period and the transition from the video output mode to the next video output mode is performed within a time range of 62.5 ms or less And the optical system for HUD.
2. The nanostructure array of claim 1,
Wherein the optical system is spaced apart by a predetermined period.
2. The nanostructure array of claim 1,
And is formed of any one material of gold (Au), silver (Ag), and aluminum (Al).
The method of claim 1, wherein the MIT film comprises
Wherein the optical system is formed of a thin film of VO ₂ material.
The semiconductor device according to claim 1, wherein the base substrate
Wherein a shape surface of one side in which the image display light is incident is formed to have a concave three-dimensional shape in the other direction.
The semiconductor device according to claim 1, wherein the base substrate
A first base substrate formed on a lower surface of the switching shutter and having a shape in one direction in which the image display light is incident has a concave shape in the other direction; And
A second base substrate formed on the lower surface of the first base substrate, the second base substrate having a shape in the other direction and having a convex shape in the other direction and corresponding to the shape of the first base substrate;
And an optical system for the HUD.
11. The method of claim 10,
And the refractive index of the first base substrate is lower than the refractive index of the second base substrate.
12. The method of claim 11,
The first base substrate is formed of any one of water, SiO _2, and oil having a refractive index of 1.5 or less,
And the second base substrate is formed of any one of Al ₂ O ₃ , SiN, and oil having a refractive index of more than 1.5.
A video output device for outputting video display light;
An optical system for HUD which is located on a traveling path of the image display light and changes a transmission amount of the image display light according to a change of an external physical signal; And
A signal adjusting device for applying a physical signal to the optical system for HUD in a predetermined period unit;
Lt; / RTI >
The HUD optical system
A base substrate having a positive dielectric constant; And a switching shutter formed on an upper surface of the base substrate and changing a transmission amount of the image display light according to a change in a physical signal applied from the outside,
The switching shutter
A metal-insulator transition material (MIT) film formed on an upper surface of the base substrate and phase-transitioning to a metal phase or an insulator phase according to a change in a physical signal applied from the outside; And an array of nanostructures having a negative dielectric constant and formed on the top surface of the MIT film with a constant cross-sectional area.
delete 14. The method of claim 13,
Wherein the image output device is formed in close contact with a lower surface of a base substrate of an optical system for a HUD.

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