TWI625550B - Head-up display - Google Patents

Abstract

A heads-up display includes a laser projector, a diffuser, an image synthesizer, and a light shield. The laser projector emits an image beam. The diffuser has a reflective surface to receive and diffusely reflect the image beam from the laser projector. The image synthesizer receives the image beam reflected from the diffuser to form a virtual image, whereby the user sees the virtual image and the real scene on the same side as the virtual image through the image synthesizer. The light shielding sheet includes a fence structure, wherein the fence structure is disposed on the reflective surface of the diffusion sheet.

Description

Head up display

This invention relates to a heads up display and, more particularly, to a reflective heads up display.

The conventional head-up display, such as the head-up display system disclosed in U.S. Patent No. 7,990,620, causes a decrease in the contrast or brightness ratio of the virtual image produced by the head-up display system in the case of strong ambient light.

It is an object of the present invention to provide a heads-up display that reduces the effect of ambient light on the contrast of the virtual image produced by it.

To achieve the above object, the present invention provides a heads-up display including a laser projector, a diffusion sheet, an image synthesizer, and a light shielding sheet. The laser projector emits an image beam. The diffuser has a reflective surface to receive and diffusely reflect the image beam from the laser projector. The image synthesizer receives the image beam reflected from the diffuser to form a virtual image, whereby the user sees the virtual image and the real scene on the same side as the virtual image through the image synthesizer. The light shielding sheet includes a fence structure, wherein the fence structure is disposed on the reflective surface of the diffusion sheet.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

10, 20‧‧‧ head-up display

11, 21‧‧ ‧ laser projector

12, 22, 32‧‧‧ diffuser

121, 221, 321 ‧ ‧ reflective surface

13, 23‧‧·Image synthesizer

14, 24, 34‧‧ ‧ shading film

341‧‧‧Transparent film

342‧‧‧Fence structure

3421‧‧‧ fence

3422‧‧‧ gap

P1, P2‧‧‧ virtual image

1 is a schematic view of a head-up display according to an embodiment of the present invention; FIG. 2 is a schematic view of a head-up display according to another embodiment of the present invention; and FIG. 3 is a schematic view of a light-shielding sheet according to an embodiment of the present invention.

1 is a schematic diagram of a heads up display in accordance with an embodiment of the present invention. Referring to FIG. 1 , the heads up display 10 includes a laser projector 11 , a diffusion sheet 12 , an image synthesizer 13 , and a light shielding sheet 14 . The laser projector 11 emits an image beam. The diffusion sheet 12 has a reflective surface 121 to receive and diffusely reflect an image beam from the laser projector 11. The image synthesizer 13 receives the image beam reflected from the diffusion sheet 12 to form a virtual image P1, whereby the user sees the virtual image P1 and the real scene on the same side as the virtual image P1 through the image synthesizer 13. The light shielding sheet 14 is disposed on the reflecting surface 121 of the diffusion sheet 12 to block the large-angle ambient light from being reflected into the image synthesizer 13 by the diffusion sheet 12, thereby reducing the influence of the ambient light on the contrast of the virtual image.

In this embodiment, the diffusion sheet 12 may be a white plastic sheet, and the light shielding sheet 14 may be a microlouver film. In the present embodiment, the heads-up display 10 can be used in a vehicle to display a driving information image by projection, and can be integrated in one device and disposed at the top of the vehicle.

2 is a schematic diagram of a heads up display in accordance with another embodiment of the present invention. Referring to FIG. 2, the heads up display 20 includes a laser projector 21, a diffusion sheet 22, an image synthesizer 23, and a light shielding sheet 24. The laser projector 21 emits an image beam. The diffusion sheet 22 has a reflecting surface 221 to receive and diffusely reflect the image light beam from the laser projector 21. The image synthesizer 23 receives the reflection from the diffusion sheet 22. The image beam is formed to form a virtual image P2, whereby the user sees the virtual image P2 and the real scene on the same side as the virtual image P2 through the image synthesizer 23. The light shielding sheet 24 is disposed on the reflecting surface 221 of the diffusion sheet 22 to block the large-angle ambient light from being reflected by the diffusion sheet 22 into the image synthesizer 23, thereby reducing the influence of the ambient light on the contrast of the virtual image.

In this embodiment, the diffusion sheet 22 may be a white plastic sheet, and the light shielding sheet 24 may be a micro louver film. In the embodiment, the head-up display 20 can be used for displaying the driving information image by the vehicle, and is generally disposed in the vehicle in a discrete manner. For example, the laser projector 21 can be disposed on the roof, the diffusion sheet 22 and the light shielding sheet 24 can be Located on the platform above the instrument panel, the image synthesizer 23 can be disposed on the windshield.

3 is a schematic view of a light shielding sheet according to an embodiment of the present invention. Referring to FIG. 3, the light shielding sheet 34 includes a light transmitting sheet 341 and an opaque barrier structure 342. The fence structure 342 includes a plurality of fences 3421 arranged in parallel and opaque, and a gap 3422 between the adjacent fences 3421. The fence structure 342 is disposed on the light transmissive sheet 341. The light shielding sheet 34 is disposed on the reflection surface 321 of the diffusion sheet 32.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. The scope of protection is subject to the definition of the scope of the attached patent application.

Claims (3)

A heads-up display comprising: a laser projector that emits an image beam; a diffuser having a reflective surface for receiving and diffusingly reflecting the image beam from the laser projector; an image synthesizer receiving the image The image beam reflected by the diffusion sheet forms a virtual image, whereby the user sees the virtual image and the real scene on the same side of the virtual image through the image synthesizer; and a light shielding film includes a fence structure, the fence structure includes a plurality of A fence arranged in parallel and opaque, and a gap between adjacent opaque barriers, wherein the barrier structure is disposed on the reflective surface of the diffusion sheet. The head-up display of claim 1, wherein the light shielding sheet comprises a light-transmitting sheet. The head-up display of claim 2, wherein the fence structure is disposed on the light-transmissive sheet.