CN115561955B

CN115561955B - Display device, electronic apparatus, and vehicle

Info

Publication number: CN115561955B
Application number: CN202211305844.8A
Authority: CN
Inventors: 赵晗; 毛磊; 冯志勇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2023-09-29
Anticipated expiration: 2041-10-14
Also published as: WO2023061079A1; CN115561955A; CN115981081A

Abstract

The present application relates to a display device including: an image generating unit, a curved mirror, and a reflecting member. The image generation unit is used for generating imaging light containing image information and projecting the imaging light to the first surface of the curved mirror; the curved mirror is used for transmitting the received imaging light from the second surface to the reflecting piece; the reflecting member is used for reflecting the received imaging light to the second surface of the curved mirror, and the second surface of the curved mirror is also used for reflecting the imaging light from the reflecting member. In the display device provided in this embodiment, the curved mirror may amplify the image reflected by the reflecting member, so that the display device may zoom in and out the image generated by the image generating unit.

Description

Display device, electronic apparatus, and vehicle

The present application is a divisional application, the application number of which is 202111195804.8, the application date of which is 2021, 10 months and 14 days, and the entire contents of which are incorporated herein by reference.

Technical Field

The present application relates to the field of image display, and in particular, to a display device, an electronic apparatus, and a vehicle.

Background

Image display technology is currently rapidly developing, and the display size is also becoming larger and larger. However, current large screen display systems (e.g., over 80 inches) are costly. The laser television can achieve a projection effect of more than 100 inches, but needs a curtain (Fresnel screen) with a specific function to improve the watching experience, and the occupied space is large. In addition, the conventional projector often requires a large projection distance, and cannot form an enlarged image in a short distance.

Disclosure of Invention

In view of this, embodiments of the present application provide a display device, a vehicle, and an electronic apparatus to provide a large-sized display function.

In a first aspect, the display device provided by the present application may include: an image generating unit, a curved mirror, and a reflecting member.

The image generation unit is used for generating imaging light containing image information and projecting the imaging light to the first surface of the curved mirror; the curved mirror is used for transmitting the received imaging light from the second surface to the reflecting piece; the reflecting member is used for reflecting the received imaging light to the second surface of the curved mirror, and the second surface of the curved mirror is also used for reflecting the imaging light from the reflecting member.

In the display device provided in this embodiment, the curved mirror may amplify the image reflected by the reflecting member, so that the display device may zoom in and out the image generated by the image generating unit. The user's eye may receive the light reflected by the curved mirror, thereby observing an enlarged virtual image (the reverse extension of the actual light). Compared with a projector or a large-size television in the prior art, the display device provided by the embodiment can display virtual images, so that a specific screen is not needed, and a large-size picture can be displayed without occupying a large space.

In addition, since the imaging light generated by the image generating unit can be incident to the reflecting member through the curved mirror, the image generating unit can be disposed close to the curved mirror, and thus the volume of the display device can be reduced.

In one possible embodiment, the first surface of the curved mirror may be a convex surface of the curved mirror and the second surface may be a concave surface of the curved mirror. That is, the imaging light projected by the image generating unit is incident from the convex surface of the curved mirror, and is emitted from the convex surface of the curved mirror to the reflecting member. The concave surface of the curved mirror is also used to reflect the imaging light from the reflector.

In one possible embodiment, the display device further includes a first polarizer located at the light-emitting side of the image generating unit, the first polarizer transmitting either S-polarized light or P-polarized light to the first surface of the curved mirror.

In one possible embodiment, the angle of incidence of the reflected imaging light and the transmitted imaging light is different for the second surface of the curved mirror.

In one possible embodiment, the second surface of the curved mirror may transmit imaging light less than the first predetermined angle and reflect imaging light greater than the second predetermined angle. For example, the first preset angle is 30 degrees, and the second preset angle is 45 degrees.

In one possible embodiment, the polarization directions of the imaging light reflected by the second surface of the curved mirror and the transmitted imaging light are different. For example, the imaging light reflected by the second surface of the curved mirror is P polarized light, and the transmitted imaging light is S polarized light; alternatively, the imaging light reflected by the second surface of the curved mirror is S polarized light, and the transmitted imaging light is P polarized light.

The second surface of the curved mirror can realize the functions of transmitting and reflecting light with different polarization directions and reflecting and transmitting light with different incidence angles through a coating film.

In one possible embodiment, the reflecting member is located within the focal length of the curved mirror, and the image reflected by the reflecting member can be magnified and displayed by the curved mirror.

In one possible embodiment, the display device further comprises a first polarization transflector positioned at the second surface of the curved mirror, the first polarization transflector being positioned in the optical path between the curved mirror and the reflector for transmitting imaging light from the second surface of the curved mirror and reflecting imaging light from the reflector.

Wherein the polarization directions of the imaging light transmitted by the first polarization transflector and the reflected imaging light may be different. For example, the imaging light reflected by the first polarizing transflector is P-polarized light, the transmitted imaging light is S-polarized light, or the imaging light reflected by the first polarizing transflector is S-polarized light, and the transmitted imaging light is P-polarized light.

The present embodiment can also realize the function of transmitting and reflecting light of different polarization directions by attaching the first polarization transreflective member to the second surface of the curved mirror. The first polarization transflector may cover the second surface of the curved mirror.

In a possible embodiment, the display device further comprises a first polarization conversion device, which is located on the optical path between the reflecting member and the curved mirror, for changing the polarization direction of the imaging light transmitted from the curved mirror and/or the polarization direction of the imaging light reflected from the reflecting member.

In one possible embodiment, the reflective element of the display device is further configured to transmit imaging light reflected by the second surface of the curved mirror. Thus, the reflecting member can be further close to the second surface of the curved mirror, and the volume of the display device can be further reduced.

In one possible embodiment, the reflective member in the display device is a second polarizing transflector that reflects the imaging light transmitted from the curved mirror and transmits the imaging light reflected from the curved mirror.

In one possible embodiment, the reflecting member in the display device includes a semi-reflective semi-transparent film for reflecting a part of the imaging light to the second surface of the curved mirror and for transmitting another part of the imaging light to the second polarizing plate; the second polarizing plate is used for absorbing the imaging light transmitted from the semi-reflecting and semi-transmitting film and transmitting the imaging light reflected from the curved mirror. The semi-reflective and semi-permeable membrane can be a semi-reflective and semi-permeable wave plate.

The present embodiment achieves the effect of reflecting the imaging light transmitted from the curved mirror and transmitting the imaging light reflected from the curved mirror by the semi-reflective and semi-transmissive film and the second polarizing plate. In addition, the semi-reflective semi-transparent film and the second polarizer are lower in cost than separate polarizing transflectors.

In one possible embodiment, the reflecting member in the display device further includes a second polarization conversion device located on the optical path between the semi-reflective and semi-transmissive film and the second polarizing plate for changing the polarization direction of the imaging light reflected from the curved mirror and the polarization direction of the imaging light transmitted by the semi-reflective and semi-transmissive film.

In one possible embodiment, the reflecting member in the display device further includes a phase compensation plate located on an optical path between the second polarization conversion device and the second polarizing plate for compensating a phase of the imaging light transmitted from the second polarization conversion device, thereby increasing purity of the transmitted imaging light.

In one possible embodiment, the imaging light reflected by the semi-reflective and semi-transparent film is circularly polarized light or elliptically polarized light, the imaging light absorbed by the second polarizer is P polarized light, and the transmitted polarized light is S polarized light; or the imaging light reflected by the semi-reflective semi-transparent film is circularly polarized light or elliptically polarized light, the imaging light absorbed by the second polarizer is S polarized light, and the transmitted polarized light is P polarized light.

In one possible embodiment, the first polarization conversion device, the semi-reflective semi-transmissive film, the second polarization conversion device, and the second polarizer in the reflector are attached to each other, thereby reducing the volume.

The phase compensation plate may be bonded to the second polarization conversion device and the second polarizing plate.

In one possible embodiment, the imaging light projected by the image generating unit in the display device is circularly polarized light or elliptically polarized light.

In a possible embodiment, the display apparatus further includes a third polarization conversion device, located on an optical path between the image generating unit and the curved mirror, for changing a polarization direction of the imaging light emitted from the image generating unit. For example, circularly polarized light or elliptically polarized light emitted from the image generating unit is converted into P-polarized light or S-polarized light.

In one possible embodiment, the curved mirror is a multifocal curved mirror or a free-form curved mirror.

In one possible embodiment, an image generating unit in a display device includes a light source for outputting a light beam to an imaging module, and a projection lens; an imaging module for generating imaging light containing image information from the light beam; and the projection lens is used for projecting the imaging light to the first surface of the curved mirror.

In one possible embodiment, the third polarization conversion device may be located on the light exit side of the projection lens. For example, the third polarization conversion device is attached to the light emitting surface of the projection lens.

In the above embodiments, the first polarization conversion device, the second polarization conversion device, and the third polarization conversion device may be a 1/4 wave plate, two 1/8 wave plates, or an optical rotator.

In a second aspect, the present application provides an electronic device comprising the display device of the first aspect.

In a third aspect, the application also provides a vehicle comprising a display device as described in the first aspect.

Drawings

FIG. 1a is a schematic diagram of a display device as a general display according to an embodiment of the present application;

FIG. 1b is a schematic diagram of a display device as a television according to an embodiment of the present application;

FIG. 1c is a schematic diagram of a display device as an in-vehicle display according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a display device according to an embodiment of the present application;

fig. 4 is a schematic diagram of the structure of an image generating unit in the display device disclosed in the embodiment of the present application;

fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present application;

fig. 11 is a schematic circuit diagram of a display device according to an embodiment of the application.

Detailed Description

The application provides a display device, an electronic apparatus and a vehicle. The display device may be used for office use as a conventional display (e.g., 100a in fig. 1 a), home entertainment (e.g., as a television) as a television (e.g., 100b in fig. 1 b), or on-board display (e.g., 100c in fig. 1 c), the display device being mounted on a vehicle seat. The physical size, display size, resolution of the display device may be adjusted according to the use scenario.

In the present application, the display device may also be referred to as a display system or a virtual image display device. The units or modules included in the display device may be referred to as components or mechanisms.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a display device according to an embodiment of the application.

As shown in fig. 2, the display device includes an image generation unit (Picture Generation Unit, PGU) 110, a reflecting member 120, and a curved mirror 130. Wherein the image generation unit 110 is configured to generate imaging light containing image information and project the imaging light toward a first surface (convex surface) 1301 of the curved mirror 130; the curved mirror 130 transmits imaging light from a second surface (concave surface) 1302 to a reflector (which may be referred to as a reflective element or reflective assembly) 120. The reflector 120 reflects the imaging light to the second surface 1302 of the curved mirror 130, and the curved mirror 130 further reflects the received imaging light outward, such as to the human eye.

In the display device provided in this embodiment, the concave surface of the curved mirror 130 is used as a reflecting surface, which is used to amplify the image reflected by the reflecting member 120 (for example, the reflecting member 120 is located within the focal length of the curved mirror 130), so that the display device can zoom in and zoom out the image generated by the image generating unit 110. The user's eye may receive the light reflected by the curved mirror 130 so that an enlarged virtual image (the reverse extension of the actual light) is observed. Compared with a projector or a large-size television in the prior art, the display device provided by the embodiment can display virtual images, so that a specific screen is not needed, and a large-size picture can be displayed without occupying a large space.

In addition, the imaging light generated by the image generating unit 110 may be incident on the reflecting member 120 through the curved mirror 130, and thus the image generating unit 110 may be disposed close to the curved mirror 130, and thus the volume of the display device may be reduced.

As shown in fig. 3, the display device provided in this embodiment may include a diffusing element (which may be a diffusing screen or a diffusing plate) 140, where the diffusing element 140 is located on an optical path between the image generating unit 110 and the curved mirror 130 (the first surface 1301) and is configured to diffuse the imaging light projected by the image generating unit 110, so that the brightness of the displayed image is uniform. For example, the imaging light projected by the image generation unit 110 is diffusely reflected or uniformly transmitted by the diffusion plate.

Further, the curved mirror in the present embodiment may be a multifocal free-form mirror. Multi-person viewing is achieved by designing a multi-focal free-form mirror.

Referring to fig. 4, fig. 4 is a schematic structural diagram of an image generating unit in a display device according to an embodiment of the present application.

As shown in fig. 4, the image generating unit (which may be referred to as an optical machine) includes a light source 101, an imaging module 102, and a projection lens 130, and may be used in the aforementioned display device or may be used independently.

The light source 101 in the present embodiment outputs a light beam (white light) to the imaging module 102. The imaging module 102 may use the light beam 1 to generate a source image. The projection lens 103 is for projecting imaging light outward, and may be a short-focus lens.

The imaging module 102 in this embodiment may be a liquid crystal on silicon (Liquid Crystal On Silicon, LCOS) display, an Organic Light-Emitting Diode (OLED) display, a liquid crystal display (Liquid Crystal Display, LCD), a digital Light processing (Digital Light Procession, DLP) display, or a microelectromechanical system (Micro-Electro-Mechanical Systems, MEMS) display.

The light source 101 in this embodiment may include a three-color light source (blue light source 1011, green light source 1012, red light source 1013), and white light emitted from the three-color light source (may be referred to as a three-primary-color light source) and output after being mixed is input to the imaging module 102, thereby generating a source image. The light source 101 may further include a first wave plate 1014 and a second wave plate (half-reflecting half-wave plate) 1015. The blue Light source 1011, the green Light source 1012, and the red Light source 1013 may be Light-Emitting Diode (LED) Light sources, or may be laser Diode Light sources.

Wherein the first wave plate 1014 is located on the optical path of the light (light) output from the light sources 1011 and 1012 for transmitting and reflecting the light. For example, the first wave plate 1014 transmits blue light emitted from the light source 1011, reflects green light emitted from the light source 1012, and inputs the reflected light and the transmitted light into the second wave plate 1015 after mixing.

The second wave plate 1015 is also disposed on the light path of the three color light outputted from the three color light sources (1011, 1012, 1013) for transmitting and reflecting the three color light. For example, the second wave plate 1015 transmits blue light emitted from the light source 1011, transmits green light emitted from the light source 1012, reflects and transmits red light emitted from the light source 1013, and mixes the reflected red light and two paths of transmitted light (blue light and green light) to be input into the imaging module 102. The imaging light projected by the projection lens 130 may be linearly polarized light, circularly polarized light or elliptically polarized light.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a display device according to an embodiment of the application.

As shown in fig. 5, the display device includes an image generating unit 210, a reflecting member 220, a curved mirror 230, a first polarization conversion device (1/4 wave plate 250 in this embodiment), and a first polarizing plate (P polarizing plate 260 in this embodiment). Wherein the image generation unit 210 is configured to generate imaging light containing image information and project the imaging light toward the first surface 2301 of the curved mirror 230.

In the present embodiment, the first surface 2301 of the curved mirror 230 is provided with the P-polarizing plate 260, and the imaging light transmitted from the P-polarizing plate is P-polarized light (P-light for short), which can be transmitted through the curved mirror 230 to the 1/4 wave plate 250.

Wherein the 1/4 wave plate 250 is positioned on an optical path between the reflecting member 220 and the curved mirror 230, and serves to change a polarization direction of the imaging light transmitted from the curved mirror 230 and a polarization direction of the imaging light reflected from the reflecting member 220. In this embodiment, the incident P polarized light is changed into circularly polarized light or elliptically polarized light after passing through the 1/4 wave plate 250. After being reflected by the reflecting member 220, the circularly polarized light or elliptically polarized light enters the 1/4 wave plate 250 again, and is converted into S polarized light (S light for short) by the 1/4 wave plate 250 to be emitted. The S-polarized light is incident on the second surface 2302 of the curved mirror 230 and is reflected off the curved mirror 230. For example, to the human eye, which can view the amplified virtual image.

In the display device provided in this embodiment, the imaging light projected by the image generating unit 210 may be natural light or P-polarized light. The imaging light projected by the image generating unit 210 passes through the P-polarizing plate 260 and then outputs P-polarized light.

In this embodiment, the imaging light reflected by the second surface 2302 of the curved mirror 230 is S-polarized light, and the transmitted imaging light is P-polarized light. Which may be formed by plating a film (abbreviated as P-trans S-film) that transmits P-polarized light and reflects S-polarized light on the second surface 2302 of the curved mirror 230. In addition, the second surface 2302 of the curved mirror 230 may be covered with a separate P-trans S film, which is similar to the coating on the second surface 2302 of the curved mirror 230.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a display device according to an embodiment of the application.

The display principle of the display device provided in fig. 6 is the same as that of fig. 5, except that the second surface 3302 of the curved mirror 330 may be coated with a film that transmits S-polarized light and reflects P-polarized light (abbreviated as S-trans-P film), and the polarizer is S-polarizer 360 in this embodiment. The functions of the image generating unit 310, the reflecting member 320, and the first polarization conversion device (1/4 wave plate 350 in this embodiment) are the same as those of the image generating unit 210, the reflecting member 320, and the 1/4 wave plate 250 in the above embodiment, and are not described herein.

In the present embodiment, the first surface 3301 of the curved mirror 330 is provided with the S-polarizer 360, that is, the light-outgoing side of the image generating unit 310 has the S-polarizer 360. The imaging light transmitted from the S-polarization plate 360 is S-polarized light, which can be transmitted through the curved mirror 330 to the 1/4 wave plate 350. The S-polarizing plate 360 may not be required if the imaging light projected by the image generating unit 310 is S-polarized light.

In this embodiment, the incident S-polarized light is changed into circularly polarized light or elliptically polarized light after passing through the 1/4 wave plate 350. After being reflected by the reflecting member 320, the circularly polarized light or elliptically polarized light enters the 1/4 wave plate 350 again, and is converted into P-polarized light by the 1/4 wave plate 350 to be emitted. The P-polarized light is incident on the second surface 3302 of the curved mirror 330 and is reflected off the curved mirror 330. For example, to the human eye, which can view the amplified virtual image.

In the display device provided in this embodiment, the imaging light projected by the image generating unit 310 may be natural light or S polarized light. The image forming light projected by the image generating unit 210 passes through the S-polarizing plate 360 and then outputs S-polarized light.

In the present embodiment, the imaging light reflected by the second surface 3302 of the curved mirror 330 is P-polarized light, and the transmitted imaging light is S-polarized light. In addition to the coating scheme, the second surface 3302 of the curved mirror 330 may also be covered with a separate S-trans P-film, which has a similar effect to the coating on the second surface 3302 of the curved mirror 330.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a display device according to an embodiment of the application.

As shown in fig. 7, the display device mainly includes an image generating unit 410, a reflecting member (including a transflective film 421, a 1/4 wave plate 422, and an S-polarizing plate 423 in this embodiment), a curved mirror 430, a first polarization conversion device (1/4 wave plate 450 in this embodiment), and a first polarizing plate (S-polarizing plate 460 in this embodiment).

Wherein the image generation unit 410 is configured to generate imaging light containing image information and project the imaging light toward the P-polarizer 460. The imaging light transmitted by the S-polarizer 460 is S-polarized light, which then enters the curved mirror 430 from the first surface 4301 of the curved mirror 430 and is transmitted from the second surface 4302 of the curved mirror 430 to the 1/4 wave plate 450. The S polarized light is converted into circularly polarized light or elliptically polarized light (left-hand direction) after being transmitted from the 1/4 wave plate 450, the circularly polarized light or elliptically polarized light is reflected and transmitted by the semi-reflective and semi-transparent film 421, the transmitted circularly polarized light or elliptically polarized light passes through the 1/4 wave plate 422 (second polarization conversion device), the light transmitted out of the 1/4 wave plate 422 is P polarized light, and the P polarized light is absorbed by the S polarizing plate 423 (second polarizing plate), i.e., the P polarized light cannot be transmitted through the S polarizing plate 423.

A part of circularly polarized light or elliptically polarized light reflected by the transflective film 421 re-enters the 1/4 wave plate 450 and is converted into P-polarized light output. The P-polarized light is incident on the second surface 4302 of the curved mirror 430, and the P-polarized light reflected by the second surface 4302 enters the 1/4 wave plate 450 again, and the imaging light output from the 1/4 wave plate 450 is circularly polarized light or elliptically polarized light (right-handed direction). The circularly polarized light or elliptically polarized light transmits the transflective film 421 and continues to propagate to the 1/4 wave plate 422, and the imaging light output from the 1/4 wave plate 422 is S polarized light, which can be transmitted through the S polarizing plate 423. For example, S-polarized light may be transmitted to the human eye, which may view the amplified virtual image.

In this embodiment, the light reflected by the semi-reflective and semi-transparent film 421 and the transmitted light have opposite propagation directions, and in order to enhance visibility, the reflected light is translated (vertically) in the figure, so that it is convenient to understand the polarization directions of the light reflected by the semi-reflective and semi-transparent film 421 and the transmitted light. In addition, the propagation directions of the light incident on the second surface 4302 of the curved mirror 430 and the light reflected from the second surface 4302 may be opposite, and the light reflected from the second surface 4302 is also translated (vertically) for the purpose of enhancing the visibility, and also for the purpose of facilitating understanding of the polarization direction of the light.

In the display device provided in this embodiment, the 1/4 wave plate 450, the semi-reflective and semi-transparent film 421, the 1/4 wave plate 422 and the S-polarizer 423 may be disposed in parallel, and may be attached to each other, and the whole is close to the second surface of the curved mirror 430. Compared with the embodiment shown in fig. 5-6, the structure of the embodiment is more compact and occupies less space. In addition, the S-polarizing plate 460 may be disposed in parallel with the image generation unit 410. The S-polarizer 460 may be attached to the projection lens of the image generation unit 410.

In this embodiment, the 1/4 wave plate 450, the transflective film 421, the 1/4 wave plate 422, and the S-polarizing plate 423 as a whole may reflect the imaging light (S-polarized light) transmitted from the second surface 4302 of the curved mirror 430 and may also transmit the imaging light (P-polarized light) reflected from the second surface 4302. Namely, the 1/4 wave plate 450, the half-reflecting and half-transmitting film 421, the 1/4 wave plate 422, and the S-polarizing plate 423 as a whole function similarly to that of the P-transmitting and S-polarizing films.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a display device according to an embodiment of the application.

As shown in fig. 8, the display device provided in this embodiment mainly includes an image generating unit 510, a reflecting member (including a semi-reflective and semi-transparent film 521, a 1/4 wave plate 522, and a P-polarizing plate 523 in this embodiment), a curved mirror 530, a first polarization conversion device (1/4 wave plate 550 in this embodiment), and a first polarizing plate (P-polarizing plate 560 in this embodiment) on the light outgoing side of the image generating unit 510.

Wherein the image generation unit 510 is configured to generate imaging light containing image information and project the imaging light toward the P-polarizing plate 560. The imaging light transmitted by the P-polarizing plate 560 is P-polarized light, which then enters the curved mirror 530 from the first surface 5301 of the curved mirror 530 and is transmitted to the 1/4 wave plate 550 from the second surface 5302 of the curved mirror 530. The P polarized light is converted into circularly polarized light or elliptically polarized light (left-hand direction) after being transmitted from the 1/4 wave plate 550, the circularly polarized light or elliptically polarized light is reflected and transmitted by the semi-reflective semi-transparent film 521, the transmitted circularly polarized light or elliptically polarized light passes through the 1/4 wave plate 522 (second polarization conversion device), the light transmitted out of the 1/4 wave plate 522 is S polarized light, but the S polarized light is absorbed by the P polarizing plate 523 (second polarizing plate), i.e., the S polarized light cannot transmit the P polarizing plate 523.

A part of circularly polarized light or elliptically polarized light reflected by the semi-reflective and semi-transmissive film 521 re-enters the 1/4 wave plate 550 and is converted into S-polarized light output. The S-polarized light is incident on the second surface 5302 of the curved mirror 530, and the S-polarized light reflected by the second surface 5302 enters the 1/4 wave plate 550 again, and the imaging light output (emitted) from the 1/4 wave plate 550 is circularly polarized light or elliptically polarized light (right-handed direction). The circularly polarized light or elliptically polarized light transmits the transflective film 521 and continues to propagate to the 1/4 wave plate 522, and the imaging light output (emitted) from the 1/4 wave plate 522 is P-polarized light, which can transmit the P-polarizing plate 523. For example, P polarized light may be transmitted to the human eye, which may view the amplified virtual image.

In this embodiment, the light reflected by the semi-reflective and semi-transparent film 521 and the transmitted light have opposite propagation directions, and in order to enhance visibility, the reflected light is translated (vertically) in the figure, so that it is convenient to understand the polarization directions of the light reflected by the semi-reflective and semi-transparent film 521 and the transmitted light. In addition, the propagation directions of the light incident on the second surface 5302 of the curved mirror 530 and the light reflected from the second surface 5302 may be opposite, and the light reflected from the second surface 5302 is also translated (vertically) for the purpose of enhancing the visibility, which is also for the purpose of understanding the polarization direction of the light.

In the display device provided in this embodiment, the 1/4 wave plate 550, the semi-reflective and semi-transparent film 521, the 1/4 wave plate 522 and the P-polarizing plate 523 may be disposed in parallel, and may be attached to each other, and the whole is close to the second surface of the curved mirror 530. Compared with the embodiment shown in fig. 5-6, the structure of the embodiment is more compact and occupies less space. In addition, the P-polarizing plate 560 may be disposed in parallel with the image generation unit 510. The P-polarizer 560 may be attached to the projection lens of the image generation unit 510.

In this embodiment, the 1/4 wave plate 550, the transflective film 521, the 1/4 wave plate 522, and the P-polarizing plate 523 as a whole may reflect the imaging light (P-polarized light) transmitted from the second surface 5302 of the curved mirror 530, and may also transmit the imaging light (S-polarized light) reflected from the second surface 5302. Namely, the 1/4 wave plate 550, the semi-reflective and semi-transmissive film 521, the 1/4 wave plate 522, and the P-polarizing plate 523 as a whole function similarly to that of the S-transmissive and P-reflective film.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a display device according to an embodiment of the application.

The display device shown in fig. 9 is similar to the display device shown in fig. 7, except that a phase compensation plate 424 is added in fig. 9, and the phase compensation plate 424 is located on the optical path between the 1/4 wave plate 422 and the S-polarizing plate 423 for compensating the phase of the imaging light transmitted from the 1/4 wave plate 422.

In this embodiment, the phase compensation plate 424 is used to compensate the phase of the S-polarized light transmitted from the 1/4 wave plate 422, so as to improve the purity of the S-polarized light, so that the S-polarized light is better transmitted through the S-polarizer 423, and improve the display brightness of the display device.

Referring to fig. 10, fig. 10 is a schematic structural diagram of a display device according to an embodiment of the application.

The display device shown in fig. 10 is similar to the display device shown in fig. 8, except that a phase compensation plate 524 is added in fig. 10, and the phase compensation plate 524 is located on the optical path between the 1/4 wave plate 522 and the P-polarizing plate 523 for compensating the phase of the imaging light transmitted from the 1/4 wave plate 522.

In this embodiment, the phase compensation plate 524 is used to compensate the phase of the P-polarized light transmitted from the 1/4 wave plate 522, so as to improve the purity of the P-polarized light, so that the P-polarized light is better transmitted through the P-polarizer 523, and improve the display brightness of the display device.

In the above embodiments provided by the present application, the polarizing plate may be referred to as a polarizer, a polarizing film, or a polarizing device. For example, a P-polarizer may be referred to as a P-polarizing film, and a trans-S-inverse P-polarizer may be referred to as a trans-S-inverse P-polarizer.

Referring to fig. 11, fig. 11 is a schematic circuit diagram of a display device according to the present application.

As shown in fig. 11, the circuits in the display device mainly include a processor 1001, a memory 1002, a controller area network (Controller Area Network, CAN) transceiver 1003, an audio module 1004, a video module 1005, a power module 1006, a wireless communication module 1007, an i/O interface 1008, a video interface 1009, a touch unit 1010, a display circuit 1028, an imaging device 1029, and the like. The processor 1001 and its peripheral elements, such as the memory 1002, the can transceiver 1003, the audio module 1004, the video module 1005, the power module 1006, the wireless communication module 1007, the i/O interface 1008, the video interface 1009, the touch unit 1010, and the display circuit 1028, may be connected by a bus. The processor 1001 may be referred to as a front-end processor.

In addition, the circuit diagram illustrated in the embodiment of the present application does not constitute a specific limitation of the display device. In other embodiments of the application, the display device may include more or less components than shown, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

The processor 1001 includes one or more processing units, for example: the processor 1001 may include an application processor (Application Processor, AP), a modem processor, a graphics processor (Graphics Processing Unit, GPU), an image signal processor (Image Signal Processor, ISP), a controller, a video codec, a digital signal processor (Digital Signal Processor, DSP), a baseband processor, and/or a Neural network processor (Neural-Network Processing Unit, NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors.

A memory may also be provided in the processor 1001 for storing instructions and data. In some embodiments, the memory in the processor 1001 is a cache memory. The memory may hold instructions or data that the processor 1001 has just used or recycled. If the processor 1001 needs to reuse the instruction or data, it can be called directly from the memory. Repeated accesses are avoided and the latency of the processor 1001 is reduced, thus improving the efficiency of the system.

In some embodiments, the display device may also include a plurality of Input/Output (I/O) interfaces 1008 coupled to the processor 1001. The interface 1008 may include, but is not limited to, an integrated circuit (Inter-Integrated Circuit, I2C) interface, an integrated circuit built-in audio (Inter-Integrated Circuit Sound, I2S) interface, a pulse code modulation (Pulse Code Modulation, PCM) interface, a universal asynchronous receiver Transmitter (Universal Asynchronous Receiver/Transmitter, UART) interface, a mobile industry processor interface (Mobile Industry Processor Interface, MIPI), a General-Purpose Input/Output (GPIO) interface, a subscriber identity module (Subscriber Identity Module, SIM) interface, and/or a universal serial bus (Universal Serial Bus, USB) interface, among others. The I/O interface 1008 may be connected to a device such as a mouse, a touch pad, a keyboard, a camera, a speaker/horn, or a microphone, or may be connected to a physical key (e.g., a volume key, a brightness adjustment key, or an on/off key) on the display device.

Memory 1002 may include internal memory, but may also include external memory (e.g., a Micro SD card), memory 1002 may be used to store computer-executable program code, including instructions. The memory 1002 may include a stored program area and a stored data area. The storage program area may store an operating system, an application program (such as a call function, a time setting function, etc.) required for at least one function, and the like. The storage data area may store data created during use of the display device (e.g., phone book, universal time, etc.), etc. In addition, the memory 1002 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, universal flash memory (Universal Flash Storage, UFS), and the like. The processor 1001 performs various functional applications of the display device and data processing by executing instructions stored in the memory 1002 and/or instructions stored in a memory provided in the processor 1001.

Further, the display device further includes a CAN transceiver 1003, and the CAN transceiver 1003 may be connected to a CAN BUS (CAN BUS) of the automobile. The display device CAN communicate with in-vehicle entertainment systems (music, radio, video modules), vehicle status systems, etc. via the CAN bus. For example, the user may turn on the in-vehicle music play function by operating the display device. The vehicle status system may send vehicle status information (doors, seat belts, etc.) to a display device for display.

The display device may implement audio functions through an audio module 1004, an application processor, and the like. Such as music playing, talking, etc.

The audio module 1004 is used to convert digital audio information into an analog audio signal output and also to convert an analog audio input into a digital audio signal. The audio module 1004 may also be used to encode and decode audio signals, such as for playback or recording. In some embodiments, the audio module 1004 may be provided in the processor 1001, or a part of functional modules of the audio module 1004 may be provided in the processor 1001.

The video interface 1009 may receive externally input audio and video, which may specifically be a high-definition multimedia interface (High Definition Multimedia Interface, HDMI), a digital video interface (Digital Visual Interface, DVI), a video graphics array (Video Graphics Array, VGA), a Display Port (DP), a low voltage differential signaling (Low Voltage Differential Signaling, LVDS) interface, and the like, and the video interface 1009 may further output video. For example, the display device receives video data transmitted by the navigation system through the video interface.

The video module 1005 may decode the video input by the video interface 1009, for example, h.264 decoding. The video module can also encode the video collected by the display device, for example, H.264 encoding is carried out on the video collected by the external camera. The processor 1001 may decode the video input from the video interface 1009 and output the decoded image signal to the display circuit.

The display circuit 1028 and the imaging device 1029 are for displaying corresponding images. In this embodiment, the video interface 1009 receives input video data (or referred to as a video source), the video module 1005 decodes and/or digitizes the input video data, and outputs an image signal to the display circuit 1028, and the display circuit 1028 drives the imaging device 1029 to image the light beam emitted by the light source 101 according to the input image signal, so as to generate a visual image. For example, the imaging device 1029 generates a source image, and emits imaging light. Among them, the display circuit 1028 and the imaging device 1029 belong to electronic components in the imaging module 102, and the display circuit 1028 may be referred to as a driving circuit.

The power module 1006 is configured to provide power to the processor 1001 and the light source 101 based on input power (e.g., direct current), and the power module 1006 may include a rechargeable battery that may provide power to the processor 1001 and the light source 101. Light emitted from the light source 101 may be transmitted to the imaging device 1029 for imaging, thereby forming an image light signal (imaging light).

In addition, the power module 1006 may be connected to a power module (e.g., a power battery) of the vehicle, and the power module 1006 of the display device is powered by the power module of the vehicle.

The wireless communication module 1007 may enable the display device to communicate wirelessly with the outside world, which may provide solutions for wireless communication such as wireless local area network (Wireless Local Area Networks, WLAN) (e.g., wireless fidelity (Wireless Fidelity, wi-Fi) network), bluetooth (BT), global navigation satellite system (Global Navigation Satellite System, GNSS), frequency modulation (Frequency Modulation, FM), near field wireless communication technology (Near Field Communication, NFC), infrared technology (IR), etc. The wireless communication module 1007 may be one or more devices that integrate at least one communication processing module. The wireless communication module 1007 receives electromagnetic waves via an antenna, modulates the electromagnetic wave signals, filters the electromagnetic wave signals, and transmits the processed signals to the processor 1001. The wireless communication module 1007 may also receive signals to be transmitted from the processor 1001, frequency modulate them, amplify them, and convert them to electromagnetic waves for radiation via an antenna.

In addition, the video data decoded by the video module 1005 may be received wirelessly by the wireless communication module 1007 or read from the memory 1002, for example, the display apparatus may receive video data from a terminal device or an in-vehicle entertainment system through a wireless lan in the vehicle, and the display apparatus may read audio/video data stored in the memory 1002, in addition to the video data input through the video interface 1009.

The touch unit 1010 may generate a control signal (e.g., a brightness/contrast adjustment signal) according to a touch operation of the touch interface by the user, and then send the control signal to the display circuit 1028 through the processor 201, and the display circuit 1028 adjusts imaging of the imaging device 1029 according to the control signal, thereby changing the displayed source image. The touch interface may include control buttons (volume, brightness, contrast adjustment buttons, etc.).

The vehicles in the embodiment of the application can be known vehicles such as automobiles, airplanes, ships, rockets and the like, and can also be new vehicles in the future. The vehicle may be an electric vehicle, a fuel vehicle, or a hybrid vehicle, for example, a pure electric vehicle, an extended range electric vehicle, a hybrid electric vehicle, a fuel cell vehicle, a new energy vehicle, etc., which is not particularly limited in the present application. In addition, the electronic device in the embodiment of the present application includes a device with a display device, which may include the above-described vehicle, and may also be used as a medical device, an office entertainment device, or an industrial control device, which is not limited in this embodiment.

The terms "first, second, third and the like in this application are used to distinguish between similar objects and not necessarily to describe a particular order or sequence, it being understood that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced in an order not described by the application. To more clearly illustrate the relationship of components in different embodiments, the present application employs the same reference numbers to designate functionally the same or similar components in different embodiments.

It should also be noted that, unless specifically stated otherwise, a specific description of some features in one embodiment may also be applied to explaining other embodiments to mention corresponding features.

Wherein like parts are referred to each other in the various embodiments of the application. The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily appreciate variations or alternatives within the scope of the present application.

Claims

1. A display device, comprising:

an image generation unit for generating imaging light containing image information and projecting the imaging light toward a first surface of a curved mirror;

the curved mirror is used for transmitting the received imaging light from the second surface to the reflecting piece, the second surface and the first surface are two surfaces opposite to the curved mirror, wherein the first surface is a convex surface, the second surface is a concave surface, and the second surface is provided with a film for transmitting S polarized light to reflect P polarized light or a film for transmitting P polarized light to reflect S polarized light;

the reflecting piece is used for receiving the imaging light reflected by the curved mirror and reflecting the received imaging light to the second surface of the curved mirror;

a first polarization conversion device located on an optical path between the reflecting member and the curved mirror for changing a polarization direction of the imaging light transmitted from the second surface of the curved mirror and a polarization direction of the imaging light reflected from the reflecting member;

the curved mirror is further used for reflecting the imaging light from the reflecting piece to the outside of the display device through the second surface of the curved mirror;

and the first polaroid is positioned on the light emitting side of the image generating unit, is positioned between the first surface and the image generating unit and transmits S polarized light or P polarized light to the first surface of the curved mirror.

2. The display device of claim 1, wherein,

the polarization direction of the imaging light reflected by the second surface of the curved mirror is different from that of the transmitted imaging light.

3. The display device according to claim 1 or 2, wherein,

the imaging light reflected by the second surface of the curved mirror is P polarized light, and the transmitted imaging light is S polarized light; or alternatively, the process may be performed,

the imaging light reflected by the second surface of the curved mirror is S polarized light, and the transmitted imaging light is P polarized light.

4. The display apparatus of claim 1, wherein the first polarization conversion device is a 1/4 wave plate.

5. The display device according to claim 1, wherein:

the reflecting member is further configured to transmit imaging light reflected by the second surface of the curved mirror.

6. The display device of claim 5, wherein,

the reflecting piece comprises a semi-reflecting and semi-transmitting film and a second polaroid, wherein the semi-reflecting and semi-transmitting film is used for reflecting part of imaging light to the first polarization conversion device and transmitting the other part of imaging light to the second polaroid;

the second polarizing plate is used for absorbing the imaging light transmitted from the semi-reflecting and semi-transmitting film and transmitting the imaging light reflected from the curved mirror.

7. The display device according to claim 6, wherein the reflecting member further comprises a second polarization conversion device located on an optical path between the semi-reflective and semi-transmissive film and the second polarizing plate for changing a polarization direction of the imaging light transmitted from the semi-reflective and semi-transmissive film.

8. The display device of claim 7, wherein the reflective member further comprises:

and a phase compensation plate located on an optical path between the second polarization conversion device and the second polarizing plate for compensating a phase of the imaging light transmitted from the second polarization conversion device.

9. The display device of claim 6, wherein,

the imaging light reflected by the semi-reflective semi-transparent film is circularly polarized light or elliptically polarized light, the imaging light absorbed by the second polaroid is P polarized light, and the transmitted polarized light is S polarized light;

or the imaging light reflected by the semi-reflective semi-transparent film is circularly polarized light or elliptically polarized light, the imaging light absorbed by the second polarizer is S polarized light, and the transmitted polarized light is P polarized light.

10. The display device according to claim 7, wherein the first polarization conversion device, the semi-reflective semi-transmissive film, the second polarization conversion device, and the second polarizing plate are attached to each other.

11. The display device according to claim 1, wherein the imaging light projected by the image generating unit is circularly polarized light or elliptically polarized light.

12. The display device according to claim 11, further comprising:

and a third polarization conversion device located on an optical path between the image generation unit and the curved mirror for changing a polarization direction of the imaging light emitted from the image generation unit.

13. The display apparatus of claim 12, wherein the third polarization conversion device is a 1/4 wave plate.

14. The display device of any of claims 1-2, wherein the curved mirror is a multifocal curved mirror or a freeform curved mirror.

15. The display device according to any one of claims 1-2, wherein the image generation unit comprises a light source, an imaging module and a projection lens,

the light source is used for outputting light beams to the image module;

the imaging module is used for generating imaging light containing image information according to the light beam;

the projection lens is used for projecting the imaging light to the first surface of the curved mirror.

16. An electronic device comprising a display device according to any one of claims 1-15.

17. A vehicle comprising a display device according to any one of claims 1 to 15.

18. The vehicle of claim 17, wherein the display device is mounted on a seat of the vehicle.