Head-up display screen, head-up display assembly, and vehicle

Patent metadata

Field	Value
Publication number	US-12130429-B2
Application number	US-202017641618-A
Country	US
Kind code	B2
Filing date	Aug 31, 2020
Priority date	Sep 23, 2019
Publication date	Oct 29, 2024
Grant date	Oct 29, 2024

Abstract

A head-up display screen, a head-up display assembly, and a vehicle are provided. The head-up display screen is attached to an inner side of an attachment surface of a windshield and configured to reflect image light emitted towards the windshield. The head-up display screen includes a functional layer, a reflective layer, and a protective layer that are sequentially arranged in a direction from the windshield to a driving position. The functional layer includes prism microstructures protruding from the inner side of the attachment surface of the windshield. The reflective layer is at least attached to lower inclined surfaces of the prism microstructures and is configured to reflect the image light towards the driving position. The protective layer covers the reflective layer and the functional layer.

First claim

What is claimed is:

1. A head-up display screen, wherein the head-up display screen is attached to an inner side of an attachment surface of a windshield and is configured to reflect image light emitted towards the windshield,
wherein the head-up display screen comprises:
a functional layer comprises prism microstructures protruding from the inner side of the attachment surface of the windshield,
a reflective layer at least attached to a lower inclined surface of each of the prism microstructures, and
a protective layer covering the reflective layer and the functional layer, wherein the functional layer, the reflective layer, and the protective layer are sequentially arranged in a direction from the windshield to a driving position,
wherein the reflective layer is configured to reflect the image light towards the driving position; and
wherein the head-up display screen further comprises a bonding layer and a substrate that are attached to each other, wherein the bonding layer is located between the windshield and the functional layer, and wherein the substrate is located between the bonding layer and the functional layer.

2. The head-up display screen according to claim 1 , wherein a cross section of one of the prism microstructures is triangular or trapezoidal, and an interior angle of a cross section of one of the prism microstructures corresponding to an upper inclined surface of the prism microstructure is an acute angle.

3. The head-up display screen according to claim 2 , wherein one of the prism microstructures further comprises a side surface attached to the inner side of the attachment surface of the windshield and connected between the upper inclined surface and the lower inclined surface; wherein incident image light is reflected by the lower inclined surface to form first emergent light, and the incident image light is sequentially refracted by the lower inclined surface, reflected by the side surface, and refracted by the upper inclined surface to form second emergent light, which is expressed as:

η
=

γ
-
α
+
β
-

a
⁢
sin
⁢

{

n
×

sin
[

β
-

a
⁢

sin

(

sin
⁢
α

n

)

-
α

]

}

,

where η represents an included angle between the first emergent light and the second emergent light, n represents a refractive index of the functional layer, α represents an included angle between the incident image light and a normal line of the lower inclined surface, β represents an included angle between the upper inclined surface and the side surface, and γ represents an included angle between the lower inclined surface and the side surface.

4. The head-up display screen according to claim 3 , wherein the included angle between the first emergent light and the second emergent light is greater than 10 degrees.

5. The head-up display screen according to claim 1 , wherein one of the prism microstructures has a Fresnel structure or a black grid structure.

6. The head-up display screen according to claim 1 , wherein a width of one of the prism microstructures on the attachment surface of the windshield ranges from 0.01 mm to 1 mm.

7. The head-up display screen according to claim 1 , wherein the protective layer has a same refractive index as the functional layer.

8. The head-up display screen according to claim 1 , wherein the reflective layer comprises superimposed transparent medium layers.

9. The head-up display screen according to claim 8 , wherein the reflective layer is further attached to upper inclined surfaces of the prism microstructures.

10. The head-up display screen according to claim 8 , wherein the superimposed transparent medium layers are made of made from non-metallic materials.

11. The head-up display screen according to claim 1 , wherein reflectivity of one of the prism microstructures decreases first and then increases as a refractive index of the protective layer increases.

12. The head-up display screen according to claim 11 , wherein the prism microstructure has a refractive index of 1.52, and an angle of light ray incident on an interface between the protective layer and one of the prism microstructures is 45°.

13. The head-up display screen according to claim 1 , wherein reflectivity of the head-up display screen ranges from 5% to 60%.

14. A head-up display assembly, comprising:
an image source configured to emit image light and comprising an image generation unit and an optical element that is a reflective curved mirror or a convergent lens;
a windshield; and
a head-up display screen,
wherein the head-up display screen is attached to the windshield, wherein light rays emitted by the image generating unit are incident on the head-up display screen after being processed by the optical element; and
wherein the head-up display screen is attached to an inner side of an attachment surface of the windshield and is configured to reflect the image light emitted towards the windshield;
wherein the head-up display screen comprises:
a functional layer comprising prism microstructures protruding from the inner side of the attachment surface of the windshield,
a reflective layer at least attached to a lower inclined surface of each of the prism microstructures, and
a protective layer covering the reflective layer and the functional layer, wherein the functional layer, the reflective layer, and the protective layer are sequentially arranged in a direction from the windshield to a driving position, and wherein the reflective layer is configured to reflect the image light towards the driving position, and wherein the head-up display screen further comprises a bonding layer and a substrate that are attached to each other, wherein the bonding layer is located between the windshield and the functional layer, and wherein the substrate is located between the bonding layer and the functional layer.

15. A vehicle, comprising a vehicle body and the head-up display assembly according to claim 14 , wherein the windshield is installed on the vehicle body.

16. The head-up display assembly according to claim 14 , wherein one of the p

Assignees

• Appotronics Corp Ltd

Inventors

• Hu Fei
• Wang Lin
• Tang Xiaofeng
• Li Shijie
• Li Yi

Classifications

• B60K35/50

  Instruments characterised by their means of attachment to or integration in the vehicle (B60K35/231 takes precedence) · CPC title

• B60K35/231

  characterised by their arrangement or structure for integration into vehicles · CPC title

• B60K35/22

  Display screens · 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

• B60K35/28

  characterised by the type of the output information, e.g. video entertainment or vehicle dynamics information; characterised by the purpose of the output information, e.g. for attracting the attention of the driver · CPC title