KR19990038918A - Automotive Head-up Display Unit - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head-up display device for automobiles, comprising: an information display unit for displaying various driving information and navigation information of a vehicle in order to read various driving-related information while keeping the gaze in front of the driving; Projection means for projecting an image image of the display unit, and a holographic combiner installed in the front windproof front of the vehicle and reflecting the image image passing through the projection means to the driver as a holographic image.

Description

Automotive Head-up Display Unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head-up display device for automobiles, and more particularly, to a head-up display device for automobiles in which a driver can read various driving-related information while keeping the gaze at the front while driving.

1 is a schematic diagram showing an example of a conventional head-up display device for a vehicle, and FIG. 2 is a schematic diagram of an indicator device employed in the head-up display device for a vehicle shown in FIG. 1.

Referring to the drawings, the head-up display device for a conventional vehicle, the instrument panel 11 is provided in the lower portion of the front windshield 13 of the vehicle, the indicator unit 20 is installed inside the instrument panel 11.

The indicator unit 20 allows the driver to recognize various driving-related information while keeping the gaze in front of the driver. The indicator unit 20 displays an indicator 21 displaying various driving information such as speed, and an image image emitted from the indicator. And a reflector 22 for reflecting and converting the optical path, and an indicator 21 and a main body 23 on which the reflector 22 is provided. The main body 23 is formed with an opening opening in the front windshield 13 direction, and a Fresnel lens 24 is mounted in the opening. The Fresnel lens 24 enlarges the image to reach the driver so that the driver sitting at a position far from the indicator 21 can easily observe the image information.

In such a structure, the image image displayed by the indicator 21 is reflected by the reflector 22 to enter the Fresnel lens 24, the light passing through the Fresnel lens 24 is enlarged while the front windshield 13 ) Is incident on the driver's eye 14. Then, the image recognized by the driver is recognized as being confined at the 15 position, so that the gaze does not need to be turned forward.

However, in the head-up display device having such a structure, the image image displayed by the indicator 21 is reflected by the front windshield 13 and then a double image is generated in the process of reaching the driver's eyes. That is, since the refractive index with respect to air is different on both surfaces of the front windshield 13 having a predetermined thickness, the incident image images are reflected on both surfaces, thereby generating a double image.

In addition, since the indicator 21 is installed in the upper part of the front panel of the instrument panel 11, when external light such as sun rays enter the indicator unit, the image displayed on the indicator 21 becomes difficult to see, and in severe cases, the image A washout phenomenon occurs in which the image disappears.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a head-up display device for automobiles capable of suppressing the occurrence of a double phase and eliminating interference on an image caused by sunlight.

1 is a schematic diagram showing an example of a conventional head-up display device for automobiles,

FIG. 2 is a schematic diagram of an indicator device employed in the head-up display device for automobiles shown in FIG. 1;

3 is a schematic configuration diagram of a head-up display device for automobiles of the present invention;

4 is a view showing an extract of the holographic combiner of FIG.

5 is a diagram illustrating spectral characteristics reflected by the holographic combiner of FIG. 3;

FIG. 6 is a diagram illustrating a path of light in the head-up display device for automobile of FIG. 3. FIG.

7 is a view illustrating a viewing angle of a driver in a vehicle in which the head-up display device of FIG. 3 is installed.

<Description of Symbols for Main Parts of Drawings>

110 ... front windshield

120 ... LCD Panel

130 ... Miller

140 ... projection means

200 ... Holographic Combiner

In order to achieve the above object, the head-up display device for a vehicle according to the present invention, an information display unit for displaying various driving information and navigation information of the vehicle; Projection means for projecting an image image of the information display portion; And a holographic combiner installed at the front windshield and reflecting the image image passing through the projection means to the driver as a holographic image.

In this case, the information display unit, LCD panel consisting of a plurality of color pixels to implement a color image, and has a backlight (back light) illumination so that the surface brightness is at least 3000 fL or more.

On the other hand, the holographic combiner, the hologram pattern is formed to have a spectral characteristics of 450 ± 15 nm and 540 ± 15 nm. In addition, the holographic combiner transmits 80% or more of light having a broad wavelength coming from the outside and reflects light of 450 ± 15 nm and 540 ± 15 nm of light incident by the projection means at least 80%. . In addition, the holographic combiner is preferably a two-color photopolymer. Here, the holographic image formed by the holographic combiner is displayed in 3-6 colors, and the holographic image is focused at a position of 2 m or more from the driver's eyes.

Hereinafter, a head up display device for a vehicle according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a schematic configuration diagram of a head-up display device of the present invention. Referring to the drawings, the head-up display device of the present invention, the information display unit 120 for displaying various driving information and navigation information of the vehicle, and projection means 140 for projecting the image image emitted from the information display unit 120 And a holographic combiner 200 installed at the front windshield 110 to reflect the image image passing through the projection means 140 to the driver as a holographic image. In this case, the mirror 130 for converting the optical path on the image is installed between the information display unit 120 and the holographic combiner 200.

The information display unit 120 is an LCD panel including a plurality of color pixels to implement color images. The LCD panel consists of approximately 180,000 pixels, the diagonal length of which is 1.3 inches.

In order for the image projected on the information display unit 120 to be visible even in daylight conditions of bright daylight (about 11,000 fL (please notify us by spelling the unit)), the surface luminance of the information display unit must be at least 3000 fL. Back light illumination was set at about 5,000 fL, so the driver can easily observe the holographic image formed by the holographic combiner 200 even in bright daylight.

The projection means 140 is an optical system for projecting the image of the information display unit 120 to the holographic combiner 200 and is composed of four spherical lenses.

FIG. 4 is a diagram illustrating the holographic combiner of FIG. 3, and the holographic combiner 200 is attached to the front windshield 110. At this time, the curvature of the surface of the holographic combiner 200 and the curvature of the surface of the front windshield 110 are the same so that the holographic combiner 200 and the front windshield 110 are closely attached to each other. do.

The holographic combiner 200 includes a recording layer 210 on which a hologram pattern is formed and a holographic substrate 220 on which the recording layer 210 is provided. In this case, the recording layer 210 has a thickness of 25 μm and is made of a photopolymer for two colors. A hologram pattern is formed on the recording layer 210 to have spectral characteristics of 450 ± 15 nm and 540 ± 15 nm.

This hologram pattern transmits 80% or more of the light of the wideband wavelength coming from the outside of the vehicle and reflects 80% or more of the light of the wavelength of 450 ± 15nm and 540 ± 15nm incident by the projection means 140 to the driver. To your eyes. That is, the holographic combiner 200 has a high transmittance with respect to light coming from the outside of the vehicle, and has a high reflectance in the spectral bandwidth of the information display unit 120 and the light projection angle bandwidth of the projection means 140.

FIG. 5 is a view illustrating spectroscopic characteristics reflected by the holographic combiner in the present embodiment, and the light having a wavelength of 450 ± 10 nm and 540 ± 10 nm is reflected at least 90% to direct the driver's eyes. The wavelengths of the laser light used to form this hologram pattern are 488 nm and 514 nm. Here, R on the vertical axis means reflectance and λ means wavelength.

The holographic combiner 200 reflects an incident image to form a holographic image, in which the holographic image is displayed in about 3 to 6 colors. That is, among the broadband wavelengths on the image incident on the holographic combiner 200, light of 450 ± 15 nm and 540 ± 15 nm wavelengths is mostly reflected, and these 450 ± 15 nm and 540 ± 15 nm wavelengths are reflected on the hologram pattern. Are properly superimposed and displayed in multiple colors. In this embodiment, the image is displayed to be expressed in five colors.

In such a head-up display device for automobiles, as shown in FIG. 6, various driving information and navigation information displayed on the information display unit 120 are emitted in an image having a broadband wavelength.

The image image is reflected by the mirror 130 to the projection means 140, and the projection means 140 collimates the incident image image to enter the holographic combiner 200.

The light having the wavelength of 450 ± 10 nm and the wavelength of 540 ± 10 nm of the broadband light incident on the holographic combiner 200 is reflected by 90% or more and directed to the driver's eye. Therefore, the image of the light collimated by the projection means 140 is reflected by the holographic combiner 200 and recognized by the driver as a virtual image formed at an infinite distance of at least 2 m or more. That is, the holographic combiner 200 serves as a planar mirror for the light having the wavelength of 450 ± 10 nm and 540 ± 10 nm.

Therefore, since the image projected by the projection means 140 is formed as a holographic virtual image at an infinite distance of 2 m or more from the driver's eyes, the driver does not need to refocus the eyes to view various driving information or navigation information. Great for driving

On the other hand, since the holographic combiner of the present invention has selective transmission and reflectivity for two wavelengths, the holographic combiner plays a different role from the mirror reflecting light of all wavelengths. That is, since the holographic combiner 200 transmits most of the light coming from the outside and reflects most of the light having the wavelength of 450 ± 10 nm and 540 ± 10 nm incident from the projection means 140, it is formed by these wavelengths. The dual image does not occur in the image, so that a clear holographic image can be obtained. This holographic image is formed just below the driver's viewing angle, as shown in FIG.

On the other hand, since the holographic combiner has a spectral bandwidth of 20 nm, light of two wavelengths can be appropriately superposed by appropriately forming the shape of the surface pattern. Therefore, a holographic virtual image having about 3 to 6 colors can be created, and information can be displayed with a color image having about 3 to 6 wavelengths, so that various information can be clearly distinguished.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

As described above, the automotive head-up display device according to the present invention. The image projected by the projection means is formed by the holographic combiner into the holographic virtual image over 2m from the driver's eyes and at an infinite distance, so the driver needs to refocus the eyes to see various driving information and navigation information. There is no. Therefore, it is very helpful for safe driving.

In addition, the holographic combiner transmits most of the light coming from the outside, and reflects most of the image images of 450 ± 10 nm and 540 ± 10 nm wavelengths in the projection means, thereby suppressing the occurrence of dual images, thereby obtaining a clear image image. Can be.

On the other hand, since the holographic combiner has a spectral bandwidth of 20 nm for the wavelengths of 450 ± 10 nm and 540 ± 10 nm, respectively, the holographic combiner has about 3-6 colors by appropriately forming a pattern shape on the surface. It can form a holographic virtual image. Therefore, information can be displayed in a color image of three to six wavelengths, and various information can be displayed distinctly.

Claims (7)

An information display unit for displaying various driving information and navigation information of a vehicle; Projection means for projecting an image image of the information display portion; And a holographic combiner installed at the front windshield and reflecting the image image passing through the projection means to the driver as a holographic image. The method of claim 1, wherein the information display unit, An LCD panel consisting of a plurality of color pixels for realizing a color image, comprising a back light illumination such that the surface brightness thereof is at least 3000 fL or more. The method of claim 1, wherein the holographic combiner is An automotive head-up display device, characterized in that a hologram pattern is formed to have spectral characteristics of 450 ± 15 nm and 540 ± 15 nm. The method of claim 3, wherein the holographic combiner, The head-up display for automobiles, characterized in that the light of the broadband wavelength transmitted from the outside transmits at least 80%, and reflects at least 80% of the light of 450 ± 15nm and 540 ± 15nm of the light incident by the projection means Device. The method of claim 4, wherein the holographic combiner, Automotive head-up display device characterized in that the two-color photopolymer (photopolymer). The method according to any one of claims 3 to 5, The holographic image formed by the holographic combiner is displayed in three to six colors of the vehicle head-up display device. The method of claim 6, The holographic image is a head-up display device for a vehicle, characterized in that to focus at a position of 2m or more from the driver's eyes.