CN216979429U - Head-up display device - Google Patents
Head-up display device Download PDFInfo
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- CN216979429U CN216979429U CN202122128144.3U CN202122128144U CN216979429U CN 216979429 U CN216979429 U CN 216979429U CN 202122128144 U CN202122128144 U CN 202122128144U CN 216979429 U CN216979429 U CN 216979429U
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- display device
- polarized light
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Abstract
The utility model provides a head-up display device which comprises a rear shell, an image generation unit, a reflector assembly, an upper cover and a cover plate, wherein the image generation unit (PGU) or the reflector assembly is provided with a phase delay film. According to the head-up display device provided by the utility model, the phase delay film is arranged on the image generation unit or the reflector component, so that the brightness of P polarized light entering eyes of a driver can be increased, and the driver wearing the polarized sunglasses can clearly see a virtual image in front of windshield glass; and can meet the requirements of different application scenes on the P polarized light brightness and the total brightness.
Description
Technical Field
The utility model relates to the field of automobiles, in particular to a head-up display device.
Background
Some head-up display devices project an image onto windshield glass, and reflect an image displayed on an image generation unit (PGU) onto the windshield glass by reflection and amplification of an internal mirror assembly (an aspherical mirror and a plane mirror), so that a virtual image appears in front of a driver.
As shown in fig. 1, the head-up display device is disposed below the windshield 2, and includes a housing 31, an image generation unit PGU32, a plane mirror 33, and an aspherical mirror 34 are disposed in the housing 31, and an image displayed on the image generation unit 32 is reflected by the plane mirror 33 and the aspherical mirror 34, and is projected onto the windshield 2 through a cover plate 37, so as to form a virtual image in front of the driver's eyes 1.
In the head-up display device product, light emitted by the image generating unit is linearly polarized light (mainly S polarized light), the S polarized light is polarized light with a polarization direction perpendicular to the incident plane, and the polarized light with the polarization direction parallel to the incident plane is called P polarized light.
If the polarization direction of the incident light is neither perpendicular to the incident plane nor parallel to the incident plane, it can be said that the linearly polarized light has both S-component polarized light and P-component polarized light. The incident surface is defined as a plane formed by the incident light and the normal line.
After the linearly polarized light is reflected by the internal reflector component and the windshield, the polarization direction is slightly changed and enters the eyes 1 of the driver, so that the S polarized light mainly enters the eyes 1 of the driver, and the brightness of the P polarized light is low and can be basically ignored.
Because with the light polarization, polarisation sunglasses can be with harmful light separation but do not influence the seeing through of visible light, really reach the protection eyes purpose, therefore polarisation sunglasses except basic anti ultraviolet function, still have anti-dazzle, road surface reflection light, surface of water light scale light etc. are fit for driving, fishing, tourism, daily wearing.
Since the P-polarized light entering the eyes 1 of the driver is too low in brightness, the driver wearing the polarized sunglasses cannot see the virtual image in front of the windshield clearly.
Disclosure of Invention
In view of the problems in the prior art, the present invention provides a head-up display device, in which a phase retardation film is disposed in an image generation unit or a mirror assembly, so that the brightness of P-polarized light entering the eyes of a driver can be increased, and the driver wearing polarized sunglasses can clearly see a virtual image in front of windshield glass; and can meet the requirements of different application scenes on the P-polarized light brightness and the total brightness.
The utility model provides a head-up display device which comprises a rear shell, an image generation unit, a reflector assembly, an upper cover and a cover plate, wherein a phase delay film is arranged inside the image generation unit or on the reflector assembly.
Furthermore, the phase retardation film is attached by optical cement.
Further, the image generation unit is internal or external.
Furthermore, the reflecting mirror assembly comprises an aspherical mirror and a plane mirror, and the phase delay film is attached to the plane mirror.
Further, the first ratio R1 of P-polarized light to S-polarized light exiting the heads-up display device depends on: a second ratio R2 determined by the incident angle θ i of the light exiting the heads-up display device 3 to be incident on the windshield 2 and a third ratio R3 of P-polarized light to S-polarized light required to enter the eyes of the driver.
Further, the θ value of the phase retardation film depends on: a first ratio R1 of P-polarized light to S-polarized light exiting the heads-up display device.
Further, the required luminance of P-polarized light entering the eyes of the driver is 500cd/m or more2。
Compared with the prior art, the head-up display device provided by the utility model has the following beneficial effects: the image generation unit or the reflector component is provided with the phase delay film, so that the brightness of P polarized light entering eyes of a driver can be increased, and the driver wearing the polarized sunglasses can see a virtual image in front of the windshield glass clearly; and can meet the requirements of different application scenes on the P-polarized light brightness and the total brightness.
Drawings
FIG. 1 is a schematic diagram of a heads-up display device according to an embodiment of the utility model;
fig. 2 is a schematic illustration of refraction of a light ray at a boundary between two media having different refractive indices.
Detailed Description
As shown in fig. 1, the head-up display device 3 according to an embodiment of the present invention includes a rear case 31, an image generating unit 32, a mirror assembly, an upper cover 35, and a cover plate 37.
The image generated by the image generation unit 32 is reflected by the mirror assemblies 33 and 34 out of the head-up display device 3, projected onto the windshield 2 of the vehicle, reflected into the eyes 1 of the driver by the windshield 2, and forms a virtual image in front of the driver, so that the driver can know the driving state of the vehicle without looking down at the instrument.
In this embodiment, the mirror assembly includes an aspherical mirror 34 and a plane mirror 33, the plane mirror 33 is provided with a phase retardation film, and the phase retardation film is attached to the plane mirror 33 by using an optical adhesive.
The phase retardation film is used to change the polarization state of transmitted light, and in order to allow a driver wearing polarized sunglasses to see a virtual image in front of the windshield, it is necessary to increase the luminance of P-polarized light, for example, the luminance of P-polarized light entering the eyes of the driver is required to be 500cd/m or more2. In this embodiment, the required luminance of P-polarized light entering the eyes of the driver is 650cd/m2。
The first ratio R1(hp/hs) of P-polarized light to S-polarized light exiting the heads-up display device depends on: a second ratio R2(Rp/Rs) determined by the incident angle θ i of the light exiting the heads-up display device 3 incident on the windshield 2 and a third ratio R3(Lp/Ls) of the P-polarized light to the S-polarized light required to enter the eyes of the driver.
According to the fresnel formula, the reflection coefficients on the windshield of the S-polarized light and the P-polarized light entering the eyes of the driver are calculated as follows:
wherein n is1Is the refractive index of air, n2Is a fold of glassThe refractive index θ i is an incident angle of light leaving the head-up display device 3 incident on the windshield 2, and θ t is a refraction angle of light leaving the head-up display device 3 incident on the windshield 2.
In the present embodiment, the refractive index n1Is 1.0, refractive index n2At 1.52, the incident angle θ i of the light leaving the head-up display device 3 incident on the windshield 2 was 65 °. The reflection coefficient Rp of P-polarized light is 0.0123, the reflection coefficient Rs of S-polarized light is 0.2357, and the second ratio R2(Rp/Rs) is 0.0522, calculated according to the above formula.
In this embodiment, the required luminance of P-polarized light entering the eyes of the driver is 650cd/m2Total luminance of 10000cd/m2Then the third ratio R3(Lp/Ls) is 650/(10000-.
Rp/Rs*hp/hs＝0.0695＝>hp/hs＝1.3314
And hp/hs is tan (2 theta) ^2, wherein theta is an included angle between the polarization direction of incident light and the fast axis direction of the phase retardation film, the phase retardation film changes the polarization state of transmitted light after passing through the phase retardation film, and the change amount of the polarization direction of the original light is 2 theta.
θ＝atan(sqrt(1.3314))/2＝24.543
Therefore, different first ratios R1(hp/hs) of P polarized light and S polarized light leaving the head-up display device can be obtained by adopting the phase retardation films with different theta values, so that different requirements of customers on P brightness and total brightness can be met, and the requirements of different application scenes can be met.
Because the phase retardation film with the corresponding theta value is pasted on the plane mirror, the brightness of the P polarized light entering the eyes of the driver can be increased, and the driver wearing the polarized sunglasses can see the virtual image in front of the windshield glass.
In another embodiment, the image generation unit 32 or the mirror assembly is provided with a phase retardation film, and may be disposed inside the image generation unit or disposed outside the image generation unit-in-light exit portion.
Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various changes and modifications within the spirit and scope of the present invention will become apparent to those skilled in the art from this disclosure, and it is intended that the scope of the present invention be defined by the appended claims.
Claims (7)
1. The head-up display device is characterized by comprising a rear shell, an image generation unit, a reflector assembly, an upper cover and a cover plate, wherein the image generation unit and the reflector assembly are arranged in a space defined by the rear shell, the upper cover and the cover plate, the image generation unit is used for generating an image, the reflector assembly is used for reflecting the image generated by the image generation unit out of the head-up display device through the cover plate and projecting the image onto a windshield of a vehicle, and the image generation unit or the reflector assembly is provided with a phase delay film.
2. The head-up display device of claim 1, wherein the phase retardation film is attached using an optical glue.
3. The head-up display device according to claim 1, wherein the phase retardation film is attached inside or outside the image generating unit.
4. The heads-up display device of claim 1 wherein the mirror assembly comprises a flat mirror and the phase retardation film is attached to the flat mirror.
5. The heads-up display device of claim 1 wherein a first ratio R1 of P-polarized light to S-polarized light exiting the heads-up display device is determined by: a second ratio R2 determined by the incident angle θ i of the light exiting the heads-up display device 3 to be incident on the windshield 2 and a third ratio R3 of P-polarized light to S-polarized light required to enter the eyes of the driver.
6. The heads-up display device of claim 5 wherein the θ value of the phase retardation film is dependent on: a first ratio R1 of P-polarized light to S-polarized light exiting the heads up display device.
7. The heads-up display device of claim 5 wherein the desired luminance of P-polarized light entering the driver's eye is greater than or equal to 500cd/m2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122128144.3U CN216979429U (en) | 2021-09-03 | 2021-09-03 | Head-up display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122128144.3U CN216979429U (en) | 2021-09-03 | 2021-09-03 | Head-up display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216979429U true CN216979429U (en) | 2022-07-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122128144.3U Active CN216979429U (en) | 2021-09-03 | 2021-09-03 | Head-up display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216979429U (en) |
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2021
- 2021-09-03 CN CN202122128144.3U patent/CN216979429U/en active Active
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