CN113848641A

CN113848641A - PGU optical system applied to HUD product

Info

Publication number: CN113848641A
Application number: CN202110904975.7A
Authority: CN
Inventors: 陈胜利; 朱高磊; 张许娜; 徐洪强; 刘维娜; 李智超; 付勇; 王凤林
Original assignee: Nanyang Lida Photoelectric Co ltd
Current assignee: Nanyang Lida Photoelectric Co ltd
Priority date: 2021-08-07
Filing date: 2021-08-07
Publication date: 2021-12-28

Abstract

The invention discloses a PGU optical system applied to HUD products. The system mainly includes a light source, a relay lens, a reflector, a dichroic plate, a photosensitive sensor, a right-angle prism and a DMD chip. This patent solves the defects of the existing PGU optical system applied to HUD products, such as excessive volume, difficult heat dissipation design, insufficient brightness when the virtual image distance is long, and insufficient brightness adjustment accuracy. The volume of a PGU optical system applied to HUD products disclosed in this patent can reach 37x95x47.2, or even smaller; in the heat dissipation design, the heat can be directly exported out of the product with the help of the HUD product shell to avoid the heat being concentrated inside the product; Compared with HUD products of other technologies, when the system uses a 0.55-inch DMD chip, the output luminous flux is more than 170lm, which can meet the brightness requirements when the virtual image distance of the HUD is greater than 10m, and realize the real AR-HUD effect.

Description

PGU optical system applied to HUD product

Technical Field

The present invention relates to a head-up display device (HUD), and more particularly to a HUD head-up display device using DLP technology.

Background

With the development of the times and scientific progress, automobile products have gradually become main outgoing vehicles in life, the popularization rate of the automobile products is increased year by year, the level of drivers is uneven, and the driving safety problem of automobiles is gradually valued by the public and the country. The head-up display technology (HUD) is a new technology which is discussed more in recent years and can avoid a driver from frequently observing an instrument or navigating in a low head mode, and the technology can be used in cooperation with other technologies such as ADS (automatic dependent surveillance digital system) and the like, so that the concentration degree of the driver is greatly improved, and the driving safety of an automobile is improved.

The head-up display technology (HUD) is applied to a plurality of technical types, and the head-up display technology applying the DLP technology can effectively avoid the temperature rise effect of the head-up display device caused by the fact that sunlight flows backwards, so that the system cannot work normally due to overhigh temperature.

At present, the main problems puzzling the application of the DLP technology in a head-up display device are that the size is overlarge, the heat dissipation is difficult, the virtual image distance is long, the brightness is insufficient when the picture is large, the brightness cannot be accurately adjusted according to different environmental changes, and the like.

Disclosure of Invention

Aiming at the existing problems, the invention provides the PGU optical system applied to the HUD product, the PGU optical system has compact layout, small volume and good heat dissipation effect, and the PGU output brightness can be improved.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a PGU optical system for HUD product which characterized in that: a light source, a relay lens group, a reflector, a dichroic plate, a diaphragm, a fly-eye lens, a relay lens, a right-angle prism and a DMD chip are sequentially arranged in the light transmission optical path direction; the light source emits light, the light is condensed by the relay lens, the direction of a light transmission optical path is changed by the reflector or the dichroic plate, the light is homogenized by the fly eye lens, the light enters the DMD chip through the right-angle prism, an image signal is emitted by the DMD chip, and the light enters the lens through the right-angle prism.

Preferably, one of the two right-angle surfaces of the right-angle prism is parallel to the surface of the DMD chip, and the other right-angle surface of the right-angle prism is perpendicular to the optical axis of the lens; the inclined plane of right angle prism has plated the membrane, the membrane makes light get into from the inclined plane, sees through right angle prism and makes light get into the DMD chip, and the image light that the DMD chip sent can see through right angle face and get into right angle prism to another right angle face is reflected through the inclined plane, gets into the camera lens.

Preferably, the light source is a three-color LED light source consisting of an LED-R light source, an LED-B light source and an LED-G light source.

Preferably, the light sources are arranged side by side and in the same plane.

Preferably, the light source arrangement plane is arranged in parallel with the optical axis of the lens.

Preferably, the three-color LED light source, the two light sources located at the inner side reflect light to the main light path through the two-way plate, the light source located at the outermost side reflects the light at a right angle by the reflector, and enters the main light path through the two-way plate, and the relay lens is disposed between the light sources.

Preferably, the edge position of the incident light of the right-angle prism is provided with a third reflector and a photosensitive sensor capable of receiving a brightness signal of the third reflector, and a part of scattered light enters the third reflector, is reflected to enter the photosensitive sensor, is converted into a control signal, and provides an accurate feedback signal for adjusting the brightness of the system.

Preferably, the relay lens group corresponding to each light source in the three-color LED light source is composed of a first relay lens and a second relay lens, where the first relay lens is a crescent lens and the second relay lens is a biconvex lens.

Preferably, the relay lens forms an angle of 33-35 degrees with the transmission direction of the incident light.

This be applied to PGU optical system of HUD product sets up and arranges G, B, R three-colour LED light sources at coplanar, through the relay lens group that comprises crescent type lens better assemble light, reduces the volume of transmission light path. The light transmission direction is turned by 90 degrees through three pairs of G, B, R dichroic plates, and scattered light rays are intercepted by arranging diaphragm plates. The fly-eye lens is arranged to homogenize light, so that the illumination uniformity of the system is improved. The fifth relay lens is a biconvex lens for condensation, so that the convergence of light transmission is improved; the light is folded to 90 degrees in a counterclockwise way according to the front view by a reflector which forms an included angle of 45 degrees with the light transmission direction; then changing the incident angle of the right-angle prism after the light enters through the biconvex lens with the included angle of 33-35 degrees between the axis and the light transmission direction; the back makes light get into the DMD chip through the right angle prism that sets up, and the DMD chip passes through the microprism angle and changes, and the switch of cooperation tristimulus light source forms picture signal, and rethread right angle prism spreads into the camera lens with picture light into, forms image plane. Scattered light is reflected into the photoreceptor through a third reflecting mirror arranged between a second reflecting mirror and a sixth relay lens and is used for providing a feedback signal for the output brightness of the regulating system.

Compared with the prior art, the invention has the beneficial effects that: the structure of the invention is more compact, and the size of the optical system is compressed to 37 x95x47.2; the light sources are arranged on the same side plane, so that the heat dissipation design is facilitated; adopt the DMD chip to be 0.55 "cun 1152x576, PGU output luminous flux is greater than 170lm, luminance requirement when can satisfying HUD virtual image distance and being greater than 10m realizes real AR-HUD effect. The problem of difficult heat dissipation design is solved by arranging the light sources on the same plane; with 2: 1 chip, the PGU output brightness can be improved; in the system, the light is partially scattered by the aid of the light, and is bent to a photosensitive sensor through a reflector, so that an accurate brightness signal is provided for brightness adjustment.

Drawings

FIG. 1 is a schematic diagram illustrating an exemplary arrangement of an optical system according to the present invention.

Fig. 2 is a top view of fig. 1.

1, a DMD chip; 2. a right-angle prism; 3. a sixth relay lens; 4. a third reflector; 5. a light-sensitive sensor; 6. a second reflector; 7. a fifth relay lens; 8. a diaphragm; 9. a fly-eye lens; 10. a second dichroic plate; 11. a fourth relay lens; 12. a first dichroic plate; 13. a third relay lens; 14. a first reflector; 16. an LED-B light source; 17. an LED-G light source; 18. a first relay lens; 19. a second relay lens.

Detailed Description

The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings. Fig. 1 and 2 show a PGU optical system applied to HUD products, which sequentially includes, along a light transmission direction: the LED-R light source 15, the LED-B light source 16 and the LED-G light source 17 are arranged side by side and on the same plane, and the light source arrangement plane is parallel to the optical axis of the lens. Light is emitted by three different light sources, namely an LED-R light source 15, an LED-B light source 16 and an LED-G light source 17, and is converged into a fly eye lens 9 through corresponding relay lens groups and dichroic plates or reflectors to form an optical path. Specifically, the LED-G light source 17 corresponds to a relay lens group composed of a first relay lens 18, which is a meniscus lens, and a second relay lens 19, which is a biconvex lens. The light output end is provided with a first reflector 14, and the LED-G light source 17 emits light which is condensed by a first relay lens 18 and a second relay lens 19 and then reflected by the first reflector 14 for 90 degrees to the main light path. Similarly, the LED-R light source 15 and the LED-B light source 16 are respectively provided with a relay lens group, the light output end is respectively provided with the second dichroic plate 10 and the first dichroic plate 12, the second dichroic plate 10 and the first dichroic plate 12 respectively reflect the light rays for 90 degrees to the main light path, and simultaneously, the light rays emitted by the LED-G light source 17 enter the main light path through the relay lens group. A fourth relay lens 11 is provided between the second dichroic plate 10 and the first dichroic plate 12, a third relay lens 13 is provided between the first dichroic plate 12 and the first reflecting mirror 14, and the fourth relay lens 11 and the third relay lens 13 are double convex lenses. The main light path formed by the three light sources enters the fly eye lens 9 for light equalization, then the stray light is intercepted by the diaphragm 8, the light is condensed again by the fifth relay lens 7, and the main light path is turned by 90 degrees by the second reflector 6. The incident light edge position of right angle prism is provided with third speculum 4 and can receive the third speculum luminance signal's photosensitive sensor 5, and partly scattered light gets into third speculum 4, and the reflection gets into photosensitive sensor 5, converts control signal into, provides accurate feedback signal for governing system luminance. The light of the main light path reflected by the second reflector 6 enters a sixth relay lens 3, the sixth relay lens 3 is a biconvex lens, an included angle of 33-35 degrees is formed between the sixth relay lens and the transmission direction of incident light, the transmission direction of the light is changed, the light can be transmitted through the inclined plane of the right-angle prism 2, one of two right-angle surfaces of the right-angle prism 2 is parallel to the surface of the DMD chip 1, and the other right-angle surface of the right-angle prism 2 is vertical to the optical axis of a lens; the inclined plane of right angle prism has plated the membrane, the membrane makes light get into from the inclined plane, sees through right angle prism and makes light get into the DMD chip, and the image light that the DMD chip sent can see through right angle face and get into right angle prism to another right angle face is reflected through the inclined plane, gets into the camera lens.

The transmission of the light beams generated by the three light sources is exemplified as follows:

1) the LED-G light source 17 emits light, and the light passes through the light condensing function of the first relay lens 18 and the second relay lens 19, then is clockwise turned by 90 ° according to a top view by the first reflector 14, then is condensed by the third relay lens 13, then passes through the first dichroic plate 12, then is condensed by the fourth relay lens 11, and then passes through the second dichroic plate 10, and then enters the fly eye lens 9.

2) The light emitted by the LED-B light source 16 passes through the light condensing function of the first relay lens 18 and the second relay lens 19, then passes through the first dichroic plate 12 to turn the light clockwise by 90 ° according to the top view, then passes through the fourth relay lens 11 to condense the light, then passes through the second dichroic plate 10, and then enters the fly eye lens 9.

3) The light emitted by the LED-R light source 15 is condensed by the two relay lenses, and then is folded by 90 ° clockwise according to the top view by the second dichroic plate 10, and enters the fly eye lens 9. The transmission optical paths of the light rays emitted by the three LED light sources are combined into one optical path behind the fly eye lens 9.

After the chief ray homogenized by the fly eye lens 9 enters the fifth relay lens 7 through the square diaphragm 8 with the aperture of 13x13 for condensation, the ray is turned by 90 degrees in the anticlockwise direction of the main view through the second reflector 6, and then a part of scattered ray enters the third reflector 4, is reflected to enter the photosensitive sensor 5, and is converted into a control signal. Sixth relay lens 3 is for biconvex lens, change light direction of transfer, make light can transmit through the right angle prism inclined plane, the chief ray gets into DMD chip 1 through the lower right angle face of dominant view direction right angle prism, handle through the DMD chip, the lower right angle face that passes through dominant view direction right angle prism with effective picture gets into right angle prism, right angle prism's inclined plane has plated the membrane, 45 inclined plane reflection effects through right angle prism turn 90 with picture light anticlockwise, send from the right angle face of dominant view direction right angle prism, get into projection lens.

The above embodiments are exemplary and not limited to the above embodiments, and any method for adjusting the light source arrangement sequence, the intermediate element sequence or the angle according to the above embodiments is within the scope of the claims.

Claims

1. The utility model provides a PGU optical system for HUD product which characterized in that: a light source, a relay lens group, a reflector, a dichroic plate, a diaphragm, a fly-eye lens, a relay lens, a right-angle prism and a DMD chip are sequentially arranged in the light transmission optical path direction; the light source emits light, the light is condensed by the relay lens, the direction of a light transmission optical path is changed by the reflector or the dichroic plate, the light is homogenized by the fly eye lens, the light enters the DMD chip through the right-angle prism, an image signal is emitted by the DMD chip, and the light enters the lens through the right-angle prism.

2. A PGU optical system applied to a HUD product according to claim 1, wherein: one of the two right-angle surfaces of the right-angle prism is parallel to the surface of the DMD chip, and the other right-angle surface of the right-angle prism is perpendicular to the optical axis of the lens; the inclined plane of right angle prism has plated the membrane, the membrane makes light get into from the inclined plane, sees through right angle prism and makes light get into the DMD chip, and the image light that the DMD chip sent can see through right angle face and get into right angle prism to another right angle face is reflected through the inclined plane, gets into the camera lens.

3. A PGU optical system applied to a HUD product according to claim 1, wherein: the light source is a three-color LED light source consisting of an LED-R light source, an LED-B light source and an LED-G light source.

4. A PGU optical system applied to a HUD product according to claim 3, wherein: the light sources are arranged side by side and in the same plane.

5. A PGU optical system for use in a HUD product according to claim 4, wherein: the light source arrangement plane is arranged in parallel with the optical axis of the lens.

6. A PGU optical system for use in HUD products according to claim 5, wherein: the three-color LED light source is characterized in that two light sources positioned on the inner side respectively reflect light to a main light path through the two-way plate, the light source positioned on the outermost side reflects the light at a right angle through the reflecting mirror, and the light enters the main light path through the two-way plate, and a relay lens is arranged between the light sources.

7. A PGU optical system applied to a HUD product according to claim 1, wherein: the edge position of the incident light of the right-angle prism is provided with a third reflector and a photosensitive sensor capable of receiving a brightness signal of the third reflector, a part of scattered light enters the third reflector, is reflected to enter the photosensitive sensor and is converted into a control signal, and an accurate feedback signal is provided for adjusting the brightness of the system.

8. A PGU optical system applied to a HUD product according to claim 3, wherein: the relay lens group corresponding to each light source in the three-color LED light source consists of a first relay lens and a second relay lens, wherein the first relay lens is a crescent lens, and the second relay lens is a biconvex lens.

9. A PGU optical system applied to a HUD product according to claim 1, wherein: the relay lens and the transmission direction of the incident light form an included angle of 33-35 degrees.