Head-up display system, display apparatus and driving apparatus

Patent metadata

Field	Value
Publication number	US-12366749-B2
Application number	US-202117796370-A
Country	US
Kind code	B2
Filing date	Aug 27, 2021
Priority date	Aug 27, 2021
Publication date	Jul 22, 2025
Grant date	Jul 22, 2025

Abstract

A head-up display system and a display apparatus are provided in this disclosure, which relates to a technical field of displaying. The head-up display system includes a display unit; a light splitting unit provided on a light emitting side of the display unit and configured to transmit a first linearly polarized light and block a second linearly polarized light, light emitted by the display unit being converted into the first linearly polarized light after passing through the light splitting unit; a light-transmitting substrate; a first imaging unit provided on an optical path from the light splitting unit to the light-transmitting substrate and configured to be able to transmit and reflect the first linearly polarized light; and a second imaging unit provided on a side of the light-transmitting substrate away from the first imaging unit, and configured to reflect the first linearly polarized light transmitted through the light-transmitting substrate.

First claim

The invention claimed is:

1. A head-up display system, comprising:
a display unit;
a light splitting unit provided on a light emitting side of the display unit and configured to transmit a first linearly polarized light and block a second linearly polarized light, light emitted by the display unit being converted into the first linearly polarized light after passing through the light splitting unit;
a light-transmitting substrate;
a first imaging unit provided on an optical path from the light splitting unit to the light-transmitting substrate and configured to be capable of transmitting and reflecting the first linearly polarized light; and
a second imaging unit provided on a side of the light-transmitting substrate away from the first imaging unit, and configured to reflect the first linearly polarized light transmitted through the light-transmitting substrate;
wherein the second imaging unit comprises a second reflective polarizer and a phase retarder, the second reflective polarizer being disposed on a side of the light-transmitting substrate away from the first imaging unit, and the phase retarder being disposed between the light-transmitting substrate and the second reflective polarizer; wherein
the phase retarder is configured to convert the first linearly polarized light into the second linearly polarized light on an optical path from the light-transmitting substrate to the second reflective polarizer; and to convert the second linearly polarized light into the first linearly polarized light on an optical path from the second reflective polarizer to the light-transmitting substrate; and
the second reflective polarizer is configured to reflect the second linearly polarized light emitted from the phase retarder.

2. The head-up display system according to claim 1 , wherein the first imaging unit comprises a transflective film provided on an optical path from the light splitting unit to the light-transmitting substrate, the transflective film being configured to reflect part of the first linearly polarized light and transmit a remaining part of the first linearly polarized light.

3. The head-up display system according to claim 1 , wherein the second imaging unit comprises a first reflective polarizer disposed on a side of the light-transmitting substrate away from the first imaging unit and configured to reflect the first linearly polarized light transmitted through the light-transmitting substrate.

4. The head-up display system according to claim 1 , wherein the phase retarder comprises a half-wave plate.

5. The head-up display system according to claim 1 , wherein the phase retarder comprises a half-wave plate and a phase retardation compensation film.

6. The head-up display system according to claim 1 , wherein the light-transmitting substrate comprises an interlayer; wherein
the interlayer is configured to be capable of changing a propagation path of lights from a first surface of the light-transmitting substrate to a second surface of the light-transmitting substrate so as to reduce reflection of the second surface, and further changing a propagation path from the second surface to the first surface to cause reflected lights of the first imaging unit and reflected lights of the second imaging unit to be radiated into a human eye along a same path; and
the first surface is a surface of the light-transmitting substrate away from the second imaging unit, and the second surface is a surface of the light-transmitting substrate away from the first imaging unit.

7. The head-up display system according to claim 6 , wherein a cross-sectional shape of the interlayer in a direction perpendicular to the light-transmitting substrate comprises a wedge shape.

8. The head-up display system according to claim 1 , wherein the head-up display system further comprises a light-transmitting protective film, the light-transmitting protective film being located on a side of the second imaging unit away from the light-transmitting substrate.

9. The head-up display system according to claim 1 , wherein the first linearly polarized light is a P polarized light and the second linearly polarized light is an S polarized light; or, the first linearly polarized light is the S polarized light, and the second linearly polarized light is the P polarized light.

10. The head-up display system according to claim 9 , wherein the display unit comprises one of an organic light emitting diode display screen, a micro display screen, a liquid crystal display screen, a digital light processing display screen and an LCOS display screen.

11. A head-up display system, comprising:
a display unit;
a light splitting unit provided on a light emitting side of the display unit and configured to transmit a first linearly polarized light and block a second linearly polarized light, light emitted by the display unit being converted into the first linearly polarized light after passing through the light splitting unit;
a light-transmitting substrate;
a first imaging unit provided on an optical path from the light splitting unit to the light-transmitting substrate and configured to be capable of transmitting and reflecting the first linearly polarized light; and
a second imaging unit provided on a side of the light-transmitting substrate away from the first imaging unit, and configured to reflect the first linearly polarized light transmitted through the light-transmitting substrate;
wherein the second imaging unit is further configured to convert ambient light into the second linearly polarized light in an optical path direction from the ambient light to the light-transmitting substrate;
wherein the second imaging unit comprises a second reflective polarizer and a phase retarder, the second reflective polarizer being further configured to convert the ambient light into the first linearly polarized light and the phase retarder being further configured to convert the first linearly polarized light into the second linearly polarized light.

12. A display apparatus comprising a head-up display system, wherein the system comprises:
a display unit;
a light splitting unit provided on a light emitting side of the display unit and configured to transmit a first linearly polarized light and block a second linearly polarized light, light emitted by the display unit being converted into the first linearly polarized light after passing through the light splitting unit;
a light-transmitting substrate;
a first imaging unit provided on an optical path from the light splitting unit to the light-transmitting substrate and configured to be capable of transmitting and reflecting the first linearly polarized light; and
a second imaging unit provided on a side of the light-transmitting substrate away from the first imaging unit, and configured to reflect the first linearly polarized light transmitted through the light-transmitting substrate;
wherein the second imaging unit comprises a second reflective polarizer and a phase retarder, the second reflective polarizer being disposed on a side of the light-transmitting substrate away from the first imaging unit, and the phase retarder being disposed between the light-transmitting substrate and the second reflective polarizer; wherein
the phase retarder is configured to convert the first linearly polarized light into the second linearly polarized light on an optical path from the light-transmitting substrate to the second reflective polarizer; and to convert the second linearly polarized light into the first linearly polarized light on an optical path from the second reflective polarizer to the light-transmitting substrate; and
the second reflective polarizer is configured to reflect

Assignees

• Beijing Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Wu Yulong
• Wang Chenru
• Dong Ruijun
• Li Ke
• Han Na
• Bai Jiarong
• Huang Haitao
• Ma Zhanshan
• Chen Lili
• Zhang Hao

Classifications

• G02B2027/0196

  having transparent supporting structure for display mounting, e.g. to a window or a windshield · CPC title

• G02B27/01

  Head-up displays · CPC title

• G02B27/0101 Primary

  characterised by optical features (G02B27/0172 takes precedence) · CPC title