CN221899409U - HUD System - Google Patents

Abstract

The utility model discloses a HUD system, comprising: the display screen comprises a first display area and a second display area; the free-form surface mirror is provided with a first surface and a second surface, the first surface is provided with a first polarized optical film, the second surface is also provided with a second optical film, and the first polarized optical film is used for enabling light rays emitted by the first display area to be totally reflected; the first polarization type optical film is also used for enabling light rays emitted by the second display area to be fully transmitted, and the second optical film is used for enabling light rays emitted by the second display area to be fully reflected; the first surface and the second surface form a preset included angle, so that the light rays emitted by the first display area and the second display area form virtual images at different positions of the windshield. Thus, two images can be formed at different positions on the windshield, and the visible range of the HUD system can be enlarged.

Description

HUD System

Technical Field

The utility model relates to the technical field of display, in particular to a HUD system.

Background Art

The HUD (Head up Display) system is a system that uses optical reflection and combines new display technology to project vehicle instrument information and guidance information onto the front windshield of the car to reduce the displacement of the driver's eye point, so that the driver can see these important driving information without lowering or turning his head, thereby improving safety and convenience during driving.

However, existing HUD systems usually display a picture at a certain position on the windshield, and the visible range of the display is small.

Utility Model Content

The purpose of the utility model is to overcome the shortcomings of the prior art and provide a HUD system capable of displaying two pictures.

The purpose of this utility model is achieved through the following technical solutions:

A HUD system comprises: a display screen, a free-form surface mirror and a windshield; the display screen comprises a first display area and a second display area; the free-form surface mirror has a first surface and a second surface, a first polarizing optical film is arranged on the first surface, and a second optical film is also arranged on the second surface, the first polarizing optical film is used to make the light emitted from the first display area to be totally reflected; the first polarizing optical film is also used to make the light emitted from the second display area to be totally transmitted, and the second optical film is used to make the light emitted from the second display area to be totally reflected; the first surface and the second surface form a preset angle, so that the light emitted from the first display area and the second display area form virtual images at different positions of the windshield.

In one of the embodiments, a plane mirror is further included, and the plane mirror is located between the display screen and the free-form surface mirror.

In one embodiment, a first bottom polarizer and a first top polarizer are disposed on the first display area, and a second bottom polarizer and a second top polarizer are disposed on the second display area, the angle between the absorption axis of the first bottom polarizer and the absorption axis of the second bottom polarizer is 90°, and the angle between the absorption axis of the first top polarizer and the absorption axis of the second top polarizer is 90°.

In one embodiment, the first polarizing optical film is a cold light mirror film.

In one embodiment, the polarization direction of the light emitted from the first display area is perpendicular to the light absorption axis of the first polarizing optical film, and the first polarizing optical film is used to cause total reflection of the light emitted from the first display area.

In one embodiment, the polarization direction of the light emitted from the second display area is parallel to the light absorption axis of the first polarizing optical film, and the first polarizing optical film is used to fully transmit the light from the second display area.

In one embodiment, the second optical film is a second polarizing optical film.

In one embodiment, the second polarizing optical film is a cold light mirror film.

In one embodiment, the second optical film is a second optical coating.

In one embodiment, the display screen is a TFT display screen.

Compared with the prior art, the utility model has at least the following advantages:

The HUD system of the utility model is provided with a display screen, a free-form surface mirror and a windshield, and the display screen is divided into a first display area and a second display area, and at the same time, a first polarized optical film is provided on the first surface of the free-form surface mirror, and a second optical film is provided on the second surface, so that the light emitted from the first display area is totally reflected by the first polarized optical film, so that the light emitted from the first display area can form a virtual image on the windshield; at the same time, the light emitted from the second display area is completely transmitted by the first polarized optical film, so that the light emitted from the second display area can be totally reflected on the second surface of the free-form surface mirror; at the same time, the first surface and the second surface are at a preset angle, so that the virtual image formed on the windshield by the light emitted from the second display area is staggered with the virtual image formed by the first display area, so as to realize the formation of virtual images with different image distances at different positions of the windshield.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

FIG1 is a schematic diagram of the structure of a display screen of a HUD system in an embodiment of the present invention;

FIG2 is a schematic diagram of the structure of a HUD system in an embodiment of the present invention;

FIG. 3 is a schematic diagram of a partially enlarged structure of point A of the HUD system in FIG. 1 .

DETAILED DESCRIPTION

In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

Please refer to a HUD system shown in Figures 1, 2 and 3, which includes: a display screen 100, a free-form mirror 200 and a windshield 300; the display screen 100 includes a first display area 110 and a second display area 120; the free-form mirror 200 has a first surface 210 and a second surface 220, a first polarizing optical film is arranged on the first surface 210, and a second optical film is also arranged on the second surface 220, the first polarizing optical film is used to make the light emitted from the first display area 110 to be totally reflected; the first polarizing optical film is also used to make the light emitted from the second display area 120 to be totally transmitted, and the second optical film is used to make the light emitted from the second display area 120 to be totally reflected; the first surface 210 and the second surface 220 form a preset angle, so that the light emitted from the first display area 110 and the second display area 120 form virtual images at different positions of the windshield 300.

It should be noted that the free-form mirror 200 has two reflective surfaces, including a first surface and a second surface. By setting a first polarized optical film on the first surface 210 of the free-form mirror and setting a second optical film on the second surface 220, the light emitted from the first display area 110 is totally reflected by the first polarized optical film, so that the light emitted from the first display area 110 can form a virtual image on the windshield; at the same time, the light emitted from the second display area 120 is completely transmitted by the first polarized optical film, so that the light emitted from the second display area 120 can be totally reflected on the second surface 220 of the free-form mirror, and at the same time, the first surface 210 and the second surface 220 are at a preset angle, so that the virtual image formed on the windshield by the light emitted from the second display area 120 is staggered with the virtual image formed by the first display area, and the light from the first display area and the light from the second display area enter the eyebox after passing through the windshield, so as to form virtual images with different image distances at different positions of the windshield. Furthermore, in this embodiment, the free-form mirror 200 is made of a transparent material, such as glass. Preferably, the display screen is a TFT (Thin Film Transistor) display screen.

Furthermore, the HUD system 10 also includes a plane mirror 400, which is located between the display screen 100 and the free-form surface mirror 200. The plane mirror 400 is used as an intermediate connector to connect the display screen, the free-form surface mirror 200 and the windshield 300. The light emitted by the display screen 100 is projected onto the plane mirror 400, and then reflected to the free-form surface mirror 200 by the plane mirror 400. Then the light reflected by the free-form surface mirror 200 is projected back onto the plane mirror 400. The light is projected onto the windshield 300 through the plane mirror 400, and virtual images with different image distances are formed at different positions on the windshield 300. Thus, the HUD system 10 can present two pictures to expand the visual range of the HUD system.

Further, the first display area 110 is provided with a first bottom polarizer and a first top polarizer, and the second display area 120 is provided with a second bottom polarizer and a second top polarizer, and the angle between the absorption axis of the first bottom polarizer and the absorption axis of the second bottom polarizer is 90°, and the angle between the absorption axis of the first top polarizer and the absorption axis of the second top polarizer is 90°. In this way, the polarization direction of the light emitted from the first display area 110 and the polarization direction of the light emitted from the second display area 120 can be at an angle of 90°. It should also be noted that, referring to FIG. 1, a1 is the absorption axis direction of the first bottom polarizer, b1 is the absorption axis direction of the second bottom polarizer, and the angle between a1 and b1 is 90°; similarly, a2 is the absorption axis direction of the first top polarizer, b2 is the absorption axis direction of the second top polarizer, and a2 and b2 are perpendicular to each other. In this way. The bottom polarizers of the two display areas are perpendicular to each other, and the top polarizers of the two display areas are perpendicular to each other, so that the first polarizing optical film can completely reflect the polarized light perpendicular to the polarization direction of the first polarizing optical film; and at the same time, the polarized light parallel to the polarization direction of the first polarizing optical film can be completely transmitted.

Preferably, the first polarizing optical film is a cold light mirror film. For example, the cold light mirror film is a 3M cold light mirror film (3MCMF film). The cold light mirror film is a mirror film formed by a dielectric multilayer film, which only reflects visible light polarized in a specific direction. When the angle of the emitted polarized light is perpendicular to the absorption axis direction of the cold light mirror film, the light will be totally reflected; and when the polarization direction of the emitted light is parallel to the absorption axis direction of the cold light mirror film, the emitted light will directly pass through the surface of the free-form mirror to which the cold light mirror film is attached.

Therefore, the polarization direction of the light emitted from the first display area 110 is perpendicular to the light absorption axis of the first polarizing optical film, and the first polarizing optical film is used to make the light emitted from the first display area 110 totally reflect.

Furthermore, the polarization direction of the light emitted from the second display area 120 is parallel to the light absorption axis of the first polarizing optical film, and the first polarizing optical film is used to allow the light from the second display area 120 to be fully transmitted.

In this way, the polarization direction of the light in the first display area 110 and the absorption axis of the cold light mirror film on the first surface 210 can be at a vertical angle, so that the light emitted from the first display area 110 is totally reflected on the first surface; at the same time, the polarization direction of the light in the second display area 120 and the absorption axis of the cold light mirror film on the first surface are at a parallel angle, so that the light emitted from the second display area 120 can completely pass through the first surface and enter the interior of the free-form surface mirror, and the light emitted from the second display area 120 is incident on the second surface and passes through the second optical film on the second surface, so that the light emitted from the second display area 120 can be totally reflected. At the same time, the polarization direction of the light after being reflected by the second surface remains unchanged, so the polarization direction of the light is still parallel to the cold light mirror film on the first surface, so it can pass through the first surface again and be projected onto the plane mirror.

Furthermore, the second optical film is a second polarized optical film. For example, the second polarized optical film can also be a 3M cold light mirror film. The polarization direction of the light emitted from the second display area 120 is perpendicular to the absorption axis direction of the second polarized optical film, so that the light passing through the second polarized optical film on the second surface can be totally reflected. At the same time, the polarization direction of the light reflected by the second surface remains unchanged, so the polarization direction of the light is still parallel to the cold light mirror film on the first surface, so it can pass through the first surface again and be projected onto the plane mirror, and then projected onto the windshield by the plane mirror to form a virtual image. In another embodiment, the second polarized optical film is a second optical coating, that is, an optical coating layer is coated on the second surface. Through the optical coating layer, the second surface has a high reflective performance, so that the light passing through the second surface can be totally reflected. The optical coating layer is a prior art and will not be described in detail here.

The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims (10)

1. A kind of HUD system, which is composed of a HUD frame, characterized by comprising the following steps:

The display screen comprises a first display area and a second display area;

The free-form surface mirror is provided with a first surface and a second surface, a first polarization type optical film is arranged on the first surface, a second optical film is also arranged on the second surface, and the first polarization type optical film is used for enabling light rays emitted by the first display area to be totally reflected;

The first polarization type optical film is also used for enabling light rays emitted by the second display area to be transmitted completely, and the second optical film is used for enabling light rays emitted by the second display area to be reflected completely; and

A windshield;

The first surface and the second surface form a preset included angle, so that the light rays emitted by the first display area and the second display area form virtual images at different positions of the windshield.

2. The HUD system of claim 1, further comprising a flat mirror positioned between the display screen and the freeform mirror.

3. The HUD system of claim 2, wherein a first bottom polarizer and a first top polarizer are disposed on the first display area, a second bottom polarizer and a second top polarizer are disposed on the second display area, an included angle between an absorption axis of the first bottom polarizer and an absorption axis of the second bottom polarizer is 90 °, and an included angle between an absorption axis of the first top polarizer and an absorption axis of the second top polarizer is 90 °.

4. The HUD system of claim 3, wherein the first polarizing optical film is a cold mirror film.

5. The HUD system according to claim 4, wherein a polarization direction of the light emitted from the first display area is perpendicular to a light absorption axis of the first polarizing optical film, and the first polarizing optical film is configured to totally reflect the light emitted from the first display area.

6. The HUD system according to claim 5, wherein a polarization direction of the light emitted from the second display area is parallel to a light absorption axis of the first polarization type optical film, and the first polarization type optical film is configured to allow the light from the second display area to be completely transmitted.

7. The HUD system of claim 1, wherein the second optical film is a second polarizing type optical film.

8. The HUD system of claim 7, wherein the second polarizing optical film is a cold mirror film.

9. The HUD system of claim 1, wherein the second optical film is a second optical coating.

10. The HUD system of claim 1, wherein the display screen is a TFT display screen.