CN115981081A

CN115981081A - Display device, electronic apparatus, and vehicle

Info

Publication number: CN115981081A
Application number: CN202111195804.8A
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: 2023-04-18
Also published as: CN115561955A; WO2023061079A1; CN115561955B

Abstract

The application relates to a display device, an electronic apparatus, and a vehicle, the display device including: an image generation unit, a curved mirror, and a reflector. 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 to the reflector from the second surface of the curved mirror; the reflector 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 reflector. In the display device provided in this embodiment, the curved mirror may magnify the image reflected by the reflector, and thus the display device may zoom in the image generated by the image generating unit.

Description

Display device, electronic apparatus, and vehicle

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 rapidly developing at present, and display sizes are also getting larger and larger. However, the cost of current large screen display systems (e.g., over 80 inches) is high. Laser television can realize the projection effect more than 100 cun, but need possess the curtain (fresnel screen) of specific function in order to promote to watch and experience, and it is very big to take up an area of the space. In addition, the conventional projector often requires a large projection distance and cannot form an enlarged image at a short distance.

Disclosure of Invention

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

In a first aspect, a display device provided herein may include: an image generation unit, a curved mirror, and a reflector.

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 to the reflecting piece from the second surface of the curved mirror; the reflector 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 reflector.

In the display device provided by the embodiment, the curved mirror can enlarge the image reflected by the reflector, so that the display device can zoom out and enlarge the image generated by the image generation unit. The user's eyes can receive the light reflected by the curved mirror, thereby observing an enlarged virtual image (a reverse extension line 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 a virtual image, so that a large-size picture can be displayed without a special screen or a large space.

In addition, since the image forming light generated by the image forming unit can be incident to the reflecting member through the curved mirror, the image forming 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 the convex surface of the curved mirror and the second surface the concave surface of the curved mirror. That is, the image forming light projected by the image generating unit enters from the convex surface of the curved mirror and exits from the convex surface of the curved mirror to the reflecting member. In addition, the concave surface of the curved mirror is also used for reflecting the imaging light from the reflecting member.

In one possible embodiment, the display device further comprises a first polarizer on the light exit side of the image generating unit, the first polarizer transmitting 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 imaging light reflected and the imaging light transmitted by the second surface of the curved mirror is different.

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

In one possible embodiment, the second surface of the curved mirror reflects imaging light and transmits imaging light with different polarization directions. 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; or 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 be coated to transmit and reflect light with different polarization directions and to reflect and transmit light with different incident angles.

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 displayed enlarged by the curved mirror.

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

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

In this embodiment, the function of transmitting and reflecting light with different polarization directions can be realized by adding the first polarization transflective member to the second surface of the curved mirror. The first polarizing transflector may cover a second surface of the curved mirror.

In one possible embodiment, the display apparatus further comprises a first polarization conversion device located in the optical path between said reflective member and said curved mirror for changing the polarization direction of the image light transmitted from said curved mirror and/or the polarization direction of the image light reflected from said reflective member.

In one possible embodiment, the reflector of the display device is further adapted 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 element in the display device is a second polarizing transflective element that reflects the imaging light transmitted from the curved mirror and transmits the imaging light reflected from the curved mirror.

In one possible embodiment, a reflector in a display device includes a transflective film for reflecting a portion of imaging light to a second surface of the curved mirror and for transmitting another portion of the imaging light to the second polarizer; the second polaroid is used for absorbing the imaging light transmitted by the semi-reflecting and semi-transmitting film and transmitting the imaging light reflected by the curved mirror. Wherein, the semi-reflecting and semi-transmitting film can be a semi-reflecting and semi-transmitting 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 transflective film and the second polarizing plate. In addition, the transflective film and the second polarizer have lower cost compared with a separate polarizing transflective member.

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

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

In one possible embodiment, the imaging light reflected by the transflective 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-reflecting and semi-transmitting film is circularly polarized light or elliptically polarized light, the imaging light absorbed by the second polaroid is S polarized light, and the transmitted polarized light is P polarized light.

In one possible embodiment, the first polarization conversion device, the transflective film, the second polarization conversion device, and the second polarizer in the reflective member 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 one possible embodiment, the display device further comprises a third polarization conversion device, located on the optical path between the image generation unit and the curved mirror, for changing the polarization direction of the imaging light emerging from the image generation 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, an imaging module, and a projection lens, the light source for outputting a light beam to the imaging module; 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 at 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 1/4 wave plates, two 1/8 wave plates, or optical rotators.

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

In a third aspect, the present 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 disclosed in 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 on-board display according to an embodiment of the present disclosure;

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

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

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

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

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

FIG. 7 is a schematic diagram of a display device according to an embodiment of the present disclosure;

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

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

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

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

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 normal 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 for on-board display (e.g. 100c in fig. 1c, the display device being mounted on a seat of a vehicle). The physical size, display size, and resolution of the display device can be adjusted according to the usage scenario.

In this 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 present disclosure.

As shown in fig. 2, the display device includes an image 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 to a first surface (convex surface) 1301 of the curved mirror 130; the curved mirror 130 transmits the imaging light from the second surface (concave surface) 1302 to the reflective member (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, for example, 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 for magnifying the image reflected by the reflector 120 (for example, the reflector 120 is located within the focal length of the curved mirror 130), so that the display device can zoom out the image generated by the image generating unit 110. The user's eyes may receive the light reflected by the curved mirror 130 so as to observe an enlarged virtual image (a reverse extension line of the actual light). Compared with the projector or the large-size television in the prior art, the display device provided by the embodiment can display a virtual image, so that a large-size picture can be displayed without a special screen or a large space.

In addition, the image forming light generated by the image generating unit 110 may be incident to 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 by the present 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 (first surface 1301) and is used for diffusing the imaging light projected by the image generating unit 110, so that the brightness of the displayed image is uniform. For example, the image light projected by the image generating unit 110 is diffusely reflected or uniformly transmitted by the diffusion plate.

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

Referring to fig. 4, fig. 4 is a schematic structural diagram of an image generation 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 engine) includes a light source 101, an imaging module 102 and a projection lens 130, and the image generating unit 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 beam 1 to generate a source image. The projection lens 103 is used to project the imaging light outward, and may be a short-focus lens.

The imaging module 102 in this embodiment may be a Liquid Crystal On Silicon (LCOS) Display, an Organic Light-Emitting Diode (OLED) Display, a Liquid Crystal Display (LCD), a Digital Light Processing (DLP) Display, or a Micro-Electro-Mechanical Systems (MEMS) Display.

The light source 101 in this embodiment may include three-color light sources (a blue light source 1011, a green light source 1012, and a red light source 1013), and white light output by mixing monochromatic light emitted by the three-color light sources (which may be referred to as three-primary-color light sources) is input to the imaging module 102, so as to generate a source image. The light source 101 may further include a first wave plate 1014 and a second wave plate (half-reflective half-transmissive 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.

The first waveplate 1014 is located on the optical path of the light output from the

light sources

1011 and 1012, and transmits and reflects the light. For example, the first waveplate 1014 transmits blue light emitted from the light source 1011, reflects green light emitted from the light source 1012, and the reflected light and the transmitted light are mixed and input to the second waveplate 1015.

The second wave plate 1015 is also located on the optical 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 the reflected red light and two paths of transmitted light (blue light and green light) are mixed and input to the imaging module 102. The image 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 present disclosure.

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

In this embodiment, a first surface 2301 of curved mirror 230 is provided with a P-polarizer 260, and the image light transmitted from the P-polarizer is P-polarized light (P-light for short), which can pass through curved mirror 230 to reach 1/4 wave plate 250.

Wherein, the 1/4 wave plate 250 is located on the optical path between the reflective member 220 and the curved mirror 230, and is used for changing the polarization direction of the imaging light transmitted from the curved mirror 230 and the polarization direction of the imaging light reflected from the reflective member 220. In this embodiment, the incident P-polarized light passes through the 1/4 wave plate 250 and becomes circularly polarized light or elliptically polarized light. The circularly polarized light or the elliptically polarized light is reflected by the reflecting member 220, and then 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 reflected by the curved mirror 230. For example, upon reflection to the human eye, the human eye may view an enlarged virtual image.

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

In this embodiment, the image light reflected by the second surface 2302 of the curved mirror 230 is S-polarized light, and the transmitted image light is P-polarized light. It can be formed by plating a film that transmits P-polarized light and reflects S-polarized light (abbreviated as a P-transparent reverse S-film) on the second surface 2302 of the curved mirror 230. Alternatively, second surface 2302 of curved mirror 230 can be coated with a separate transflective S film, which has a similar effect as the effect of coating second surface 2302 of curved mirror 230.

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

Fig. 6 provides the same display principle as 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-reflective P-film), and the polarizer is an S-polarizer 360 in this embodiment. The image generating unit 310, the reflecting element 320, and the first polarization conversion device (the 1/4 wave plate 350 in this embodiment) have the same functions as the image generating unit 210, the reflecting element 320, and the 1/4 wave plate 250 in the above embodiments, and are not described herein again.

In this embodiment, the first surface 3301 of the curved mirror 330 is provided with an S-polarizer 360, i.e., the light-exiting side of the image generating unit 310 has the S-polarizer 360. The image light transmitted from the S-polarizer 360 is S-polarized light, and the S-polarized light may transmit the curved mirror 330 to the 1/4 wave plate 350. The S polarizer 360 may not be needed if the image light projected by the image generating unit 310 is S polarized light.

In this embodiment, the incident S-polarized light passes through the 1/4 wave plate 350 and is changed into circularly polarized light or elliptically polarized light. After being reflected by the reflecting member 320, the circularly polarized light or the 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 reflected by the curved mirror 330. For example, upon reflection to the human eye, the human eye may view an enlarged 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 light projected by the image generating unit 210 passes through the S polarizer 360 and outputs S polarized light.

In the present embodiment, the image light reflected by the second surface 3302 of the curved mirror 330 is P-polarized light, and the transmitted image 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 transflective P film, which has 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 present disclosure.

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-polarizer 423 in this embodiment), a curved mirror 430, a first polarization conversion device (a 1/4 wave plate 450 in this embodiment), and a first polarizer (an S-polarizer 460 in this embodiment).

The image generating unit 410 is configured to generate imaging light including image information, and project the imaging light to the P-polarizer 460. The imaging light transmitted by the S-polarizer 460 is S-polarized light, which is then incident on the curved mirror 430 from the first surface 4301 of the curved mirror 430 and transmitted from the second surface 4302 of the curved mirror 430 to the 1/4 wave plate 450. The S polarized light is transmitted through the 1/4 wave plate 450 and then converted into circularly polarized light or elliptically polarized light (in the left-handed direction), the circularly polarized light or elliptically polarized light is reflected and transmitted by the semi-reflecting and semi-transmitting 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 polarizer 423 (second polarizer), that is, the P polarized light cannot transmit through the S polarizer 423.

Part of the 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 to be output. The P-polarized light is incident on the second surface 4302 of the curved mirror 430, the P-polarized light reflected by the second surface 4302 enters the 1/4 wave plate 450 again, and the imaged 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 the elliptically polarized light transmits the transflective film 421 and continues to the 1/4 wave plate 422, the imaging light output from the 1/4 wave plate 422 is S-polarized light, and the S-polarized light can transmit the S-polarizer 423. For example, the S-polarized light may be transmitted to the human eye, which may view an enlarged virtual image.

In this embodiment, the light reflected by the transflective film 421 and the transmitted light have opposite propagation directions, and the reflected light is translated (vertically) for enhancing visibility, so as to facilitate understanding of the polarization directions of the reflected light and the transmitted light by the transflective film 421. In addition, the light incident on the second surface 4302 of the curved mirror 430 and the light reflected from the second surface 4302 may travel in opposite directions, and the light reflected from the second surface 4302 is translated (vertically) for visibility enhancement and for understanding the polarization direction of the light.

In the display device provided by this embodiment, the 1/4 wave plate 450, the transflective 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 present embodiment is more compact and occupies less space. In addition, the S-polarizer 460 may be disposed in parallel with the image generating unit 410. The S-polarizer 460 may be attached to the projection lens of the image generating unit 410.

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

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

As shown in fig. 8, the display device provided in this embodiment mainly includes an image generating unit 510, a reflecting member (including a transflective 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 (a 1/4 wave plate 550 in this embodiment), and a first polarizing plate (a P-polarizing plate 560 in this embodiment) on the light exit side of the image generating unit 510.

The image generation unit 510 is configured to generate image light including image information, and project the image light toward the P-polarizer 560. The P-polarizer 560 transmits the image light as P-polarized light, which is then incident on the curved mirror 530 from a first surface 5301 of the curved mirror 530 and transmitted from a second surface 5302 of the curved mirror 530 to the 1/4 waveplate 550. The P polarized light is transmitted through the 1/4 wave plate 550 and then converted into circularly polarized light or elliptically polarized light (left-handed direction), the circularly polarized light or elliptically polarized light is reflected and transmitted by the transflective 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 polarizer 523 (second polarizer), that is, the S polarized light cannot transmit through the P polarizer 523.

Part of the circularly polarized light or elliptically polarized light reflected by the transflective 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, the S-polarized light reflected by the second surface 5302 enters the 1/4 wave plate 550 again, and the imaged 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 the elliptically polarized light transmits through the transflective film 521 and continues to the 1/4 wave plate 522, and the image light output (emitted) from the 1/4 wave plate 522 is P-polarized light, which can transmit through the P-polarizer 523. For example, the P-polarized light may be transmitted to the human eye, which may view an enlarged virtual image.

In this embodiment, the light reflected by the transflective film 521 and the transmitted light have opposite propagation directions, and the reflected light is translated (vertically) for visibility enhancement, so as to facilitate understanding of the polarization directions of the reflected light and the transmitted light by the transflective film 521. 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 in the figure, the light reflected from the second surface 5302 is also translated (vertically) for enhancing visibility, and for facilitating understanding of the polarization direction of the light.

In the display device provided by this embodiment, the 1/4 wave plate 550, the transflective film 521, the 1/4 wave plate 522 and the P-type polarizer 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 present embodiment is more compact and occupies less space. Further, the P-polarizer 560 may be disposed in parallel with the image generating unit 510. The P-polarizer 560 may be attached to the projection lens of the image generating unit 510.

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

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

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 to fig. 9, and the phase compensation plate 424 is located on the optical path between the 1/4 wave plate 422 and the S-polarizer 423 for compensating the phase of the image light transmitted through 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 through the 1/4 wave plate 422, so as to improve the purity of the S-polarized light, so that the S-polarized light better transmits 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 present disclosure.

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-polarizer 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 for compensating the phase of the P-polarized light transmitted through the 1/4 wave plate 522, so as to improve the purity of the P-polarized light, so that the P-polarized light better transmits through the P-polarizer 523, and improve the display brightness of the display device.

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

Referring to fig. 11, fig. 11 is a circuit schematic diagram of a display device provided in 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 (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 components, 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 via a bus. The processor 1001 may be referred to as a front-end processor.

The circuit diagram according to the embodiment of the present application is not particularly limited to the display device. In other embodiments of the present application, the display device may include more or fewer components than shown, or some components may be combined, some components may be split, or a different arrangement of components may be used. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Among other things, processor 1001 includes one or more processing units, such as: the Processor 1001 may include an Application Processor (AP), a modem Processor, a Graphics Processing Unit (GPU), an Image Signal Processor (ISP), a controller, a video codec, a Digital Signal Processor (DSP), a baseband Processor, and/or a Neural-Network Processing Unit (NPU), etc. Wherein, the different processing units may be independent 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 have just been used or recycled by the processor 1001. If the processor 1001 needs to use the instruction or data again, it can be called directly from the memory. Avoiding repeated accesses reduces the latency of the processor 1001, thereby increasing 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 (I2C) Interface, an Inter-Integrated Circuit built-in audio (I2S) Interface, a Pulse Code Modulation (PCM) Interface, a Universal Asynchronous Receiver/Transmitter (UART) Interface, a Mobile Industry Processor Interface (MIPI), a General-Purpose Input/Output (GPIO) Interface, a Subscriber Identity Module (SIM) Interface, and/or a Universal Serial Bus (USB) Interface, etc. The I/O interface 1008 may be connected to devices such as a mouse, a touch panel, a keyboard, a camera, a speaker/speaker, and a microphone, and may also be connected to physical keys (e.g., a volume key, a brightness adjustment key, and a switch key) on the display device.

The memory 1002 may include internal memory and may also include external memory (e.g., a Micro SD card), and the memory 1002 may be used to store computer executable program code comprising instructions. The memory 1002 may include a program storage area and a data storage area. The storage program area may store an operating system, an application program (such as a call function, a time setting function, and the like) required by at least one function, and the like. The storage data area may store data (such as a phone book, world time, etc.) created during use of the display device, and the like. Further, the memory 1002 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk Storage device, a Flash memory device, a Universal Flash Storage (UFS), and the like. The processor 1001 executes 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. Through the CAN bus, the display device CAN communicate with an in-vehicle entertainment system (music, radio, video module), a vehicle status system, and the like. For example, the user can turn on the in-vehicle music playing function by operating the display device. The vehicle state system may transmit vehicle state information (doors, seat belts, etc.) to the display device for display.

The display device may implement an audio function through the audio module 1004 and the application processor, etc. 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 disposed in the processor 1001, or some functional modules of the audio module 1004 may be disposed in the processor 1001.

The Video Interface 1009 may receive an externally input audio/Video, and may specifically be a High Definition Multimedia Interface (HDMI), a Digital Video Interface (DVI), a Video Graphics Array (VGA), a Display Port (DP), a Low Voltage Differential Signaling (LVDS) Interface, and the Video Interface 1009 may further output an external Video. For example, the display device receives video data transmitted by a navigation system through a video interface.

The video module 1005 may decode video input from the video interface 1009, for example, h.264 decoding. The video module may also encode video collected by the display device, for example, h.264 encoding video collected by an external camera. Further, the processor 1001 may decode 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 used to display corresponding images. In this embodiment, the video interface 1009 receives input video data (or called 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 according to the input image signal to image a light beam emitted by the light source 101, thereby generating a visible image. For example, the imaging device 1029 generates a source image, emitting imaging light. The display circuit 1028 and the imaging device 1029 belong to electronic elements in the imaging module 102, and the display circuit 1028 may be referred to as a driving circuit.

The power module 1006 is used for providing power to the processor 1001 and the light source 101 according to the input power (e.g., direct current), and the power module 1006 may include a rechargeable battery, which may provide power to the processor 1001 and the light source 101. The light emitted from the light source 101 may be transmitted to the imaging device 1029 to be imaged, 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 perform Wireless Communication with the outside, and may provide solutions for Wireless Communication such as Wireless Local Area Networks (WLANs) (e.g., wireless Fidelity (Wi-Fi) network), bluetooth (Bluetooth, BT), global Navigation Satellite System (GNSS), frequency Modulation (FM), near Field Communication (NFC), infrared (IR), and the like. The wireless communication module 1007 may be one or more devices integrating at least one communication processing module. The wireless communication module 1007 receives an electromagnetic wave via an antenna, performs frequency modulation and filtering on an electromagnetic wave signal, and transmits the processed signal to the processor 1001. The wireless communication module 1007 may also receive a signal to be transmitted from the processor 1001, frequency-modulate it, amplify it, and convert it into electromagnetic waves via an antenna to radiate it.

In addition, besides being input through the video interface 1009, the video data decoded by the video module 1005 may also be received wirelessly through the wireless communication module 1007 or read from the memory 1002, for example, the display device may receive the video data from a terminal device or a vehicle-mounted entertainment system through a wireless local area network in a vehicle, and the display device may also read audio and video data stored in the memory 1002.

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

The vehicle in the embodiment of the present application may be a known vehicle such as an automobile, an airplane, a ship, a rocket, or may be a vehicle newly appearing 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, and the like, which is not specifically limited in this application. In addition, the electronic device in the embodiment of the present application includes a device installed with a display device, which may include the vehicle, and may also be 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 for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order, it being understood that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be implemented in a sequence not described in this application. To more clearly show the relationship between components in different embodiments, the same reference numbers are used in this application to refer to components that are the same or similar in function in different embodiments.

It should also be noted that, unless otherwise specified, a specific description of some features in one embodiment may also be applied to explain that other embodiments refer to corresponding features.

In this application, the same and similar parts among the various embodiments may be referred to each other. The above description is only for the specific embodiments of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall cover the protection scope of the present application.

Claims

1. A display device, comprising:

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

the curved mirror is used for transmitting the received imaging light from the second surface of the curved mirror to the reflecting piece;

the reflector is used for reflecting the received imaging light to the second surface of the curved mirror;

the curved mirror is also used for reflecting the imaging light from the reflecting piece through the second surface of the curved mirror.

2. The display device of claim 1, further comprising:

a first polarizer on a light exit side of the image generation unit, the first polarizer transmitting S-polarized light or P-polarized light to a first surface of the curved mirror.

3. The display device of claim 1,

the polarization directions of the imaging light reflected and the imaging light transmitted by the second surface of the curved mirror are different.

4. The display device according to claim 1 or 3,

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 first and second liquid crystal display panels may be,

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.

5. The display device of claim 1, further comprising:

a first polarization conversion device located on an optical path between the reflector and the curved mirror for changing a polarization direction of the imaging light transmitted from the second surface of the curved mirror and/or a polarization direction of the imaging light reflected from the reflector.

6. The display apparatus of claim 5, wherein the first polarization conversion device is a 1/4 wave plate.

7. The display device of claim 5, wherein:

the reflector is also configured to transmit imaging light reflected by the second surface of the curved mirror.

8. The display device of claim 7,

the reflecting piece comprises a semi-reflecting and semi-transmitting film and a second polarizing plate, 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 polarizing plate;

the second polaroid is used for absorbing the imaging light transmitted by the semi-reflecting and semi-transmitting film and transmitting the imaging light reflected by the curved mirror.

9. The display device according to claim 8, wherein the reflecting member further comprises a second polarization conversion device disposed in an optical path between the transflective film and the second polarizing plate for changing a polarization direction of the image light transmitted through the transflective film.

10. The display device of claim 9, wherein the reflective member further comprises:

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

11. The display device of claim 8,

the imaging light reflected by the semi-reflecting and semi-transmitting 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-reflecting and semi-transmitting film is circularly polarized light or elliptically polarized light, the imaging light absorbed by the second polaroid is S polarized light, and the transmitted polarized light is P polarized light.

12. The display apparatus according to claim 9, wherein the first polarization conversion device, the transflective film, the second polarization conversion device, and the second polarizing plate are attached to each other.

13. 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.

14. The display device of claim 13, further comprising:

a third polarization conversion device 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.

15. The display apparatus of claim 14, wherein the third polarization conversion device is a 1/4 wave plate.

16. The display device of any one of claims 1-15, wherein the curved mirror is a multifocal curved mirror or a free-form curved mirror.

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

the light source is used for outputting a light beam 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.

18. An electronic device characterized by comprising the display device according to any one of claims 1 to 17.

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

20. A vehicle as claimed in claim 19, wherein the display device is mounted on a seat of the vehicle.