Display, display system, image projection system, and movable object

Patent metadata

Field	Value
Publication number	US-12189246-B2
Application number	US-202318243162-A
Country	US
Kind code	B2
Filing date	Sep 7, 2023
Priority date	Jun 29, 2018
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

Provided is a head-up display including a backlight configured to emit light, a light-diffusion member through which the light emitted by the backlight is transmitted, a Fresnel lens through which the light transmitted through the light-diffusion member is transmitted, a display screen through which the light transmitted through the Fresnel lens is transmitted, and a mirror that reflects the light transmitted through the light-diffusion member toward a target space.

First claim

What is claimed is:

1. A head-up display comprising:
a backlight configured to emit light;
a light-diffusion member through which the light emitted by the backlight is transmitted;
a heat sink disposed along at least one side of the light-diffusion member and one side of the backlight;
a Fresnel lens through which the light transmitted through the light-diffusion member is transmitted;
a display screen through which the light transmitted through the Fresnel lens is transmitted; and
a mirror that reflects the light transmitted through the light-diffusion member toward a target space.

2. The head-up display according to claim 1 , wherein
the light-diffusion member has a thickness equal to or smaller than 300 μm.

3. The head-up display according to claim 1 , wherein
an uneven surface of the Fresnel lens is on a backlight side.

4. The head-up display according to claim 1 , wherein
the heat sink has a plurality of plate-shaped fins protruding from an outer surface of the heat sink in a direction intersecting a direction in which the light-diffusion member and the backlight are arranged.

5. The head-up display according to claim 1 , wherein
the heat sink is made of aluminum.

6. The head-up display according to claim 1 , wherein
the heat sink includes a body part having a hollow rectangular prism shape.

7. A head-up display comprising:
a backlight configured to emit light;
a first light-transmissive member through which the light emitted by the backlight is transmitted;
a second light-transmissive member through which the light transmitted through the first light-transmissive member is transmitted;
a light-diffusion member through which the light transmitted through the second light-transmissive member is transmitted; and
a mirror that reflects the light transmitted through the light-diffusion member toward a target space,
wherein the light-diffusion member has a thickness equal to or smaller than 300 μm.

8. The head-up display according claim 7 further comprising:
a display screen in which the light transmitted through the light-diffusion member enters and emits the light toward the mirror.

9. The head-up display according to claim 7 further comprising:
a heat sink disposed along at least one side of the light-diffusion member and one side of the backlight.

10. The head-up display according to claim 9 , wherein
the heat sink has a plurality of plate-shaped fins protruding from an outer surface of the heat sink in a direction intersecting a direction in which the light-diffusion member and the backlight are arranged.

11. The head-up display according to claim 9 , wherein
the heat sink is made of aluminum.

12. The head-up display according to claim 9 , wherein
the heat sink includes a body part having a hollow rectangular prism shape.

13. A method for projecting an image for a head-up display comprising:
emitting a light by a backlight;
passing the light emitted by the backlight through an uneven surface of a Fresnel lens;
passing the light transmitted through the Fresnel lens through a light-diffusion member;
passing the light transmitted through the light-diffusion member through a display screen;
displaying an image on the display screen; and
forming a virtual image corresponding to the image displayed on the display screen by reflecting the light transmitted through the display screen, in a target space.

14. The method for projecting the image for head-up display according to claim 13 , wherein
the light-diffusion member has a thickness equal to or smaller than 300 μm.

15. The method for projecting the image for head-up display according to claim 13 , wherein
the light is incident on the uneven surface of the Fresnel lens.

16. The method for projecting the image for head-up display according to claim 13 , further comprising:
dissipating heat radiating from the display screen through a heat sink disposed along at least one side of the light-diffusion member and one side of the backlight.

Assignees

• Panasonic Ip Man Co Ltd
• Panasonic Automotive Systems Co Ltd

Inventors

• Hada Takato
• Akiyoshi Takahiro
• Hara Hiroki
• Sugiyama Keiji

Classifications

• B60K35/22

  Display screens · CPC title

• B60K2360/785

  on or in relation to the windshield or windows · CPC title

• B60K2360/334

  Projection means · CPC title

• B60K35/60

  Instruments characterised by their location or relative disposition in or on vehicles (arrangements of lighting devices on dashboards B60Q3/10) · CPC title

• G03B21/16

  Cooling; Preventing overheating · CPC title