TWI657262B - Head-up display with anti-backlighting function - Google Patents

Abstract

A head-up display which is resistant to backlighting is used to prevent an infrared / ultraviolet light from being reflected to an image generator. The head-up display includes a mirror module, and a cold mirror is located between the mirror module and the image generator. The infrared / ultraviolet rays of the solar light source are projected to the cold mirror through the mirror module, and the infrared / ultraviolet rays will pass through the cold mirror and not be reflected to the image generator, thereby increasing the service life of the image generator.

Description

Anti-backlight head-up display

The present invention relates to the technical field of a head-up display, and in particular, to a head-up display with anti-backlight illumination.

In recent years, with the development of high-tech products, the current public demand for vehicles has gradually changed from the performance of vehicles to the requirements for vehicle safety equipment. Therefore, in order to ensure that the driver can obtain driving information without moving his or her eyes to the dashboard in a complicated traffic environment, the Head Up Display (HUD) setting can make driving information appear in front of the driver's line of sight. Avoid drivers ignoring outside road conditions and affecting driving safety.

A head-up display is known as described in Republic of China No. I495902. The conventional head-up display includes a display unit, a flat mirror, a concave mirror, and a windshield. The display unit provides image light to reflect the light to the concave mirror through a flat mirror. The concave mirror then reflects the light to the windshield to further reflect the light to the driver's eyes through the windshield, so that the driver can receive various driving information without affecting the driving safety.

However, an infrared ray generated by a solar light source is reflected by a concave mirror to a flat mirror, and then reflected by the flat mirror to the display unit, so that the infrared ray in the solar light source will cause the display unit. damage. Secondly, the ultraviolet rays contained in solar light sources can also damage materials that are not resistant to ultraviolet rays.

The main object of the present invention is to provide a head-up display which is resistant to backlighting, which has the advantage of preventing an infrared / ultraviolet light from being reflected to an image generator.

In order to achieve the above-mentioned object and effect, the head-up display with anti-backlighting disclosed in the present invention includes a mirror module and an image generator, and a cold mirror is located between the mirror module and the image generator . The infrared / ultraviolet rays of the solar light source are projected to the cold mirror through the mirror module, and the infrared rays / ultraviolet rays pass through the cold mirror and do not travel to the image generator.

In one embodiment, the cold mirror has a heat sink, and the heat sink is combined with the cold mirror.

In one embodiment, the mirror module includes a first mirror and a second mirror, and the first mirror and the second mirror are separated from each other in a path in which light travels.

The above-mentioned objects and advantages of the present invention can be obtained from the detailed description and accompanying drawings of selected embodiments described below.

Please refer to FIG. 1, which is a head-up display with anti-backlighting provided by the first embodiment of the present invention. The head-up display includes an image generator 10, a mirror module 20 and a cold mirror 30.

The image generator 10 is used for providing an image light. The image generator 10 may be a liquid crystal (LC) image generator, a liquid crystal on silicon (LCoS) image generator, or a micro-electromechanical system (MEMS) image generator. The image generator 10 is used for generating an image light 12. The content of the image light 12 may include meter information, driving map, driving record image light, or other similar image light.

The mirror module 20 includes a first mirror 22 and a second mirror 24. The first reflecting mirror 22 and the second reflecting mirror 24 are separated from each other and located in a path traveled by the image light 12. The above-mentioned reflecting mirror group 20 includes two reflecting mirrors for illustrative purposes only. In fact, according to the requirements of the length of the optical path, an appropriate number of reflecting mirrors can be set.

The cold mirror 30 is disposed between the mirror module 20 and the image generator 10. The cold mirror 30 (Cold Mirror or IR pass filters) has a characteristic of reflecting visible light and allowing infrared rays (not shown) in the solar light source 40 to pass through.

Please refer to FIG. 1 again, the image light 12 provided by the image generator 10 is visible light. In actual use, the image light 12 provided by the image generator 10 travels to the cold mirror 30 and is reflected by the cold mirror 30 to the reflecting mirror group 20.

After being reflected by the first reflecting mirror 22 and the second reflecting mirror 24 of the reflecting mirror group 20, the image light beam 12 can directly or indirectly travel to the front windshield 60, and then be reflected by the front windshield 60 to Eyes 62. In addition, the image light rays 12 reflected by the first mirror 22 and the second mirror 24 of the mirror group 20 can also be projected onto a display panel (not shown).

Please refer to FIG. 2. During daylight hours, the car is often exposed to the sun. At this time, the solar light 41 generated by the solar light source 40 will penetrate the front windshield 60, and the first windshield 60 A reflecting mirror projects 22 onto the second reflecting mirror 24, and then projects from the second reflecting mirror 24 onto the cold mirror 30. Since the cold mirror 30 has a function of allowing the infrared ray 42 to pass through, the infrared / ultraviolet light 42 can penetrate the cold mirror 30 without reflection and travel to the image generator 10. In other words, although the car is exposed to the sun, the infrared rays / ultraviolet rays 42 are no longer included in the solar rays 41 reflected from the cold mirror 30, so the heating effect of the infrared rays 42 on the image generator 10 can be reduced, and The image generator 10 can keep a low temperature and improve the service life. In addition, for materials that are not resistant to ultraviolet radiation, this implementation can reduce the probability of material damage.

According to the above description, in addition to the fact that the cold mirror 30 can reflect the image light 12 in this embodiment, it is more important to prevent the components in the image generator 10 from being affected by the infrared light / ultraviolet light 42. This causes thermal damage and light damage.

Please refer to FIG. 3, which is a head-up display with anti-backlighting provided by the second embodiment of the present invention. The difference from the first embodiment is that one side of the cold mirror 30 is further provided with a heat sink 50, and the heat sink The device 50 is combined with the cold mirror 30. Therefore, in actual use, the thermal energy generated by the infrared light / ultraviolet light 42 projected from the solar light 41 of the cold mirror 30 can be more quickly transmitted to the external space by the heat dissipation device 50, thereby enabling the present embodiment. The cold mirror 30 used can be maintained at a relatively low temperature, thereby maintaining the use efficiency of the cold mirror 30.

The above description is only an illustration to illustrate the present invention, and does not limit the present invention in any form. The scope of the claimed rights of the present invention shall be based on the scope of the patent application, rather than being limited to the above embodiments. Any person with ordinary knowledge in the technical field can make use of the disclosed technical content to make some changes or modifications to equivalent embodiments without departing from the scope of the technical solution of the present invention. The contents of the technical solutions are still within the scope of the technical solutions of the present invention.

10‧‧‧Image Generator

12‧‧‧ visible light

20‧‧‧Reflector Module

22‧‧‧first mirror

24‧‧‧Second Mirror

30‧‧‧ Cold Mirror

40‧‧‧ solar light source

41‧‧‧ sun rays

42‧‧‧ Infrared / UV

50‧‧‧Cooling device

60‧‧‧Front windshield

62‧‧‧ eyes

FIG. 1 is a schematic diagram of an optical path of visible light according to the first embodiment of the present invention. FIG. 2 is a schematic diagram of an optical path of infrared rays according to the first embodiment of the present invention. FIG. 3 is a schematic diagram of an optical path of infrared rays according to a second embodiment of the present invention.

Claims (3)

A head-up display that is resistant to backlighting includes: an image generator for providing an image light; a mirror module for reflecting the image light; a cold mirror for the mirror module And the image generator; wherein the cold mirror is used to reflect the image light to the mirror module; and the cold mirror is used for infrared / ultraviolet rays to pass through to reduce the infrared / ultraviolet reflection from the cold mirror to The image generator. The head-up display with anti-backlighting described in item 1 of the scope of the patent application, further includes a heat dissipation device on one side of the cold mirror, and the heat dissipation device is combined with the cold mirror. The head-up display with anti-backlighting according to item 1 of the scope of the patent application, wherein the mirror module includes a first mirror and a second mirror, and the first mirror and the second mirror are separated from each other. Is in the path that the image's rays travel.