CN118244567A

CN118244567A - Projection equipment, display equipment and vehicle

Info

Publication number: CN118244567A
Application number: CN202211666842.1A
Authority: CN
Inventors: 陈晨; 蔡春龙
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-12-23
Filing date: 2022-12-23
Publication date: 2024-06-25
Also published as: WO2024131644A1

Abstract

A projection device, a display device and a vehicle are disclosed, relating to the technical field of light display. The projection device includes: the system comprises a collimation light source, a compound eye, an imaging system, a projection unit and a first diaphragm, wherein the first diaphragm is positioned between the compound eye and the imaging system. The collimation light source is used for providing a collimated light beam, and the compound eye is used for carrying out light homogenizing treatment on the collimated light beam to obtain a first light beam. The first light beam passes through a first diaphragm to obtain a second light beam, wherein the first diaphragm is used for shielding part of light in the first light beam. The imaging system is used for generating an image to be projected according to the second light beam. Finally, the projection unit is used for projecting the image to be projected. In the case that the part of light can cause bright spots (dark state light leakage) of the projection image in the black field, the diaphragm can be used for shielding the bright spots, so that dark state light leakage of the projection device is reduced, and the image contrast of the projection image output by the projection unit for projecting the fourth light beam is improved.

Description

Projection equipment, display equipment and vehicle

Technical Field

The present application relates to the field of light display technologies, and in particular, to a projection device, a display device, and a vehicle.

Background

Projection display is a method of controlling a light source by plane image information, magnifying and displaying an image on a projection screen using an optical system and a projection space. Such as a projection device comprising in order: light source, imaging system, liquid crystal on silicon (Liquid Crystal on Silicon, LCos), phase compensation plate, polarizer and projection objective module. The phase compensation plate is used for compensating the phase difference brought by LCos. In general, an optical compensation film is disposed behind the phase compensation film, and the principle of the optical compensation film is to change the thickness and the collocation of the adhesive layer and the film layer, so as to adjust and optimize the compensation value of the in-plane and out-of-plane optical path difference, thereby realizing the symmetrical compensation of the phase difference generated by the birefringent effect at LCos on different observation angles, reducing the dark state light leakage of the projection device, and improving the image contrast outputted by the projection objective module. However, the adhesive layer and the film layer in the optical compensation film are only suitable for a specific projection device, and when the optical compensation film is suitable for other projection devices, the problem of dark state light leakage still exists, so that the contrast ratio of an image output by the projection device is influenced.

Disclosure of Invention

The application provides projection equipment, display equipment and a vehicle, which solve the problem of more dark state light leakage in the projection equipment and the problem of influence on the image contrast of a projection objective lens module caused by dark state light leakage.

In a first aspect, an embodiment of the present application provides a projection apparatus, including: the system comprises a collimation light source, a compound eye, an imaging system, a projection unit and a first diaphragm, wherein the first diaphragm is positioned between the compound eye and the imaging system. Wherein the collimated light source is configured to provide a collimated light beam. The compound eye is used for carrying out dodging treatment on the collimated light beam to obtain a first light beam. The first light beam passes through a first diaphragm to obtain a second light beam, wherein the first diaphragm is used for shielding part of light in the first light beam. The imaging system is used for generating an image to be projected according to the second light beam. Finally, the projection unit is used for projecting the image to be projected.

In this embodiment, the aperture in the projection device may be used to block a portion of light in the first light beam, and in the case where the portion of light may cause a bright spot (dark state light leakage) of the projection image in the black field, the aperture may be used to block the bright spot, so as to reduce dark state light leakage of the projection device and improve image contrast of the projection image projected by the projection unit. In addition, as the first light beam is obtained by carrying out light homogenizing treatment on the collimated light beam by the compound eye, each sub-light beam in the first light beam is uniformly distributed, and part of light in the first light beam is collimated and shielded by the first diaphragm, dark state light leakage of the projection equipment is further reduced, and the image contrast of a projection image output by the projection equipment is improved.

In an optional implementation manner, the projection device provided in this embodiment further includes: and the second diaphragm is positioned between the imaging system and the projection unit, and is used for shielding part of light in the image to be projected, which is output by the imaging system. In this embodiment, the aperture in the projection device may be further used to block part of light in the image to be projected, and in the case where there is dark state light leakage in the image to be projected, the aperture may be used to block bright spots in the dark state light leakage, so as to reduce dark state light leakage of the projection device and improve image contrast of the projection image output by the projection unit for projecting the fourth light beam.

In an alternative implementation, the collimated light source includes: a light source and a collimation system. The light source is used for providing an incident light beam, and the collimation system is used for collimating the incident light beam to obtain a collimated light beam. Illustratively, the aforementioned light source includes at least one of a light-emitting diode (LED) light source and a laser light source.

In this embodiment, the collimating system is configured to collimate an incident light beam provided by the light source, so that the light beam emitted by the light source is not dispersed, and the collimated light beam is more uniform, which is beneficial to improving the image contrast of the projected image.

In an optional implementation manner, the projection device provided in this embodiment further includes: the control unit is used for turning off the sub-light sources corresponding to the dark state light leakage area in the light source. Or the control unit is used for reducing the brightness of the sub-light sources corresponding to the dark state light leakage area in the light source. In this embodiment, the control unit performs regional adjustment on the incident light source, which is favorable for reducing part of light output by the light-emitting surface in the compound eye, so as to further reduce the problem of dark state light leakage, improve the image contrast of the projection image, turn off the sub-light sources or reduce the brightness of the sub-light sources, and also is favorable for reducing the energy consumption of the projection device and saving the cost of light display.

In an alternative example, the control unit is further configured to adjust a position of the first diaphragm, so that the adjusted first diaphragm blocks the light beam corresponding to the dark state light leakage area.

In another alternative example, the control unit is further configured to adjust a position of the second diaphragm, so that the adjusted second diaphragm blocks the light beam corresponding to the dark state light leakage region.

For example, the above dark state light leakage region may refer to a bright spot region of the projected image in a black field. With further development of artificial intelligence, the technical scheme provided by the embodiment can be combined with an artificial intelligent chip to intelligently control the special-shaped diaphragm and the light source, and accurately and automatically adjust various dark state light leakage conditions of an actual light path system, so that image contrast is improved.

In an alternative implementation, the compound eye includes a first lens array and a second lens array, where each lens array includes a plurality of lenses that are uniformly arranged. For example, the collimated beam passes through a first set of lens arrays to obtain an intermediate beam, and the intermediate beam passes through a second set of lens arrays to obtain a first beam. In this embodiment, after the light beam is processed by the compound eye, the arrangement of the first light beam output by the light emitting surface of the compound eye is more uniform, which is beneficial to improving the image contrast of the projection image.

In an alternative implementation, the aforementioned imaging system includes: a polarization processing unit, a polarization beam splitter, an optical modulator, and a phase compensation plate.

As one possible optical path transmission scheme: the second light beam is transmitted through the polarization processing unit to obtain a single polarized light beam, the single polarized light beam is reflected by the polarization beam splitter to obtain a reflected light beam, the reflected light beam is modulated by the light modulator to obtain a modulated light beam, and the modulated light beam is transmitted through the phase compensation sheet and the polarization beam splitter to obtain an image to be projected.

As another possible optical path transmission mode: the second light beam passes through the polarization processing unit to obtain a single polarized light beam; the single polarized light beam is transmitted through the polarization beam splitter and the phase compensation sheet to obtain a compensated light beam, and the compensated light beam is modulated by the light modulator to obtain a modulated light beam; further, the modulated light beam is reflected via a polarizing beam splitter to obtain an image to be projected.

For example, the optical modulator may include: LCos.

In one possible example, the aforementioned polarization processing unit includes: a polarized light converter, a lens and a polarizer. In the polarization processing unit, the transmission mode of the optical path is as follows: the second light beam passes through the polarized light converter to obtain a first intermediate light beam, the first intermediate light beam passes through the lens to obtain a second intermediate light beam, and the second intermediate light beam passes through the polarizer to obtain a single polarized light beam.

In this embodiment, the polarization processing unit improves the light beam emitted by the light source into single polarized light, so that the problem of image contrast reduction caused by the mutual influence of the light beams at different positions is avoided, and the quality of the image projected by the projection device is improved.

In a second aspect, an embodiment of the present application provides a display apparatus including: a processor and a projection device as provided in any of the implementations of the first aspect, the aforementioned processor being configured to send image data of a picture to be projected to the projection device. Notably, the display device may include, but is not limited to, a projector, a projection system, other light display systems including LCos, such as an augmented Reality (Augmented Reality, AR) device or a Virtual Reality (VR) device, or the like.

In a third aspect, embodiments of the present application provide a vehicle comprising: a reflective element for emitting a light beam to the reflective element, and a display device provided in the second aspect, the reflective element being for reflecting the light beam emitted from the display device.

Advantageous effects of the second aspect to the third aspect may be described with reference to any implementation manner of the first aspect, and are not repeated.

In a fourth aspect, an embodiment of the present application provides an optical module, including: a collimated light source and a control unit. The control unit is used for turning off the sub-light source corresponding to the dark state light leakage area in the light source or reducing the brightness of the sub-light source corresponding to the dark state light leakage area in the light source. In this embodiment, the control unit performs regional adjustment on the incident light source, which is favorable for reducing part of light output by the light-emitting surface in the compound eye, so as to further reduce the problem of dark state light leakage, improve the image contrast of the projection image, turn off the sub-light sources or reduce the brightness of the sub-light sources, and also is favorable for reducing the energy consumption of the projection device and saving the cost of light display.

In an alternative implementation, the collimated light source includes: a light source and a collimation system. The light source is used for providing an incident light beam, and the collimation system is used for collimating the incident light beam to obtain a first light beam.

Illustratively, the light source comprises at least one of an LED light source and a laser light source.

In another optional implementation manner, the optical module provided by the embodiment of the application further includes a compound eye, and the compound eye is used for carrying out light homogenizing treatment on the first light beam input by the straight light source to obtain the second light beam. Illustratively, the compound eye includes a first group lens array and a second group lens array, each group lens array including a plurality of uniformly arranged lenses.

In yet another alternative implementation, the optical module provided in an embodiment of the present application further includes an imaging system, where the imaging system includes: a polarization processing unit, a polarization beam splitter, an optical modulator, and a phase compensation plate.

For example, the optical modulator may include: LCos.

In a fifth aspect, an embodiment of the present application provides a display apparatus including: a processor and a projection device as provided in any one of the implementation forms of the fourth aspect, where the processor is configured to send image data of a picture to be projected to the projection device.

In a sixth aspect, an embodiment of the present application provides a vehicle, the vehicle comprising: a reflective element for emitting a light beam to the reflective element, and a display device provided in the fifth aspect, the reflective element being for reflecting the light beam emitted from the display device.

Advantageous effects of the fifth aspect to the sixth aspect may be described with reference to any implementation manner of the fourth aspect, and are not repeated. Further combinations of the present application may be made to provide further implementations based on the implementations provided in the above aspects.

Drawings

Fig. 1 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application;

FIG. 2 is a schematic view of a diaphragm for shading light according to an embodiment of the present application;

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

Fig. 4A is a schematic structural diagram III of a projection apparatus according to an embodiment of the present application;

fig. 4B is a schematic structural diagram of a projection apparatus according to an embodiment of the present application;

FIG. 5 is a schematic diagram of dark state light leakage comparison according to an embodiment of the present application;

Fig. 6 is a schematic diagram illustrating adjustment of dark state light leakage according to an embodiment of the present application.

Detailed Description

An embodiment of the present application provides a projection apparatus, including: the system comprises a collimation light source, a compound eye, an imaging system, a projection unit and a first diaphragm, wherein the first diaphragm is positioned between the compound eye and the imaging system. Wherein the collimated light source is configured to provide a collimated light beam. The compound eye is used for carrying out dodging treatment on the collimated light beam to obtain a first light beam. The first light beam passes through a first diaphragm to obtain a second light beam, wherein the first diaphragm is used for shielding part of light in the first light beam. The imaging system is used for generating an image to be projected according to the second light beam. Finally, the projection unit is used for projecting the image to be projected. In this embodiment, the aperture in the projection device may be used to block a portion of light in the first light beam, and in the case where the portion of light may cause a bright spot (dark state light leakage) of the projection image in the black field, the aperture may be used to block the bright spot, so as to reduce dark state light leakage of the projection device and improve the image contrast of the projection image output by the projection unit for projecting the fourth light beam. In addition, as the first light beam is obtained by carrying out light homogenizing treatment on the collimated light beam by the compound eye, each sub-light beam in the first light beam is uniformly distributed, and part of light in the first light beam is collimated and shielded by the first diaphragm, dark state light leakage of the projection equipment is further reduced, and the image contrast of a projection image output by the projection equipment is improved.

The following detailed description of the above embodiments will first give a description of technical terms of the related art.

Dark state: when the projection device projects a picture, each pixel in the projection image is in a black field state, and the black field refers to that the pixel value is 255.

Dark state light leakage: when a projection device projects a picture, even if each pixel in the picture is in a black field state, a bright spot exists in a projection image or the pixel value of a part of pixels is not 255 but other values from 0 to 254 because of factors of hardware devices and the like.

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. In the description of the present application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or by an abutting or integral connection; the specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

In order to reduce the dark state light leakage problem in the projection process, a projection device provided in an embodiment of the present application is described below with reference to fig. 1, and fig. 1 is a schematic structural diagram of a projection device provided in an embodiment of the present application, where the projection device includes: the system comprises a collimated light source 10, a compound eye 20, an imaging system 40, a projection unit 50 and a first diaphragm 31, wherein the first diaphragm 31 is positioned between the compound eye 20 and the imaging system 40.

For example, the first diaphragm 31 is perpendicular to the transmission optical path (optical path between the compound eye 20 and the imaging system 40) so that light before the first diaphragm 31 cannot pass through the first diaphragm 31. It is noted that when the diaphragm is disposed between different optical devices, light leakage due to light reflection can be avoided, which is advantageous for improving the image contrast of the projected image.

In some possible cases, beam 1 is referred to as a first beam and beam 2 is referred to as a second beam, with the portion of beam 1 that is blocked by first stop 31 being sub-beam 1.

As shown in fig. 1, a collimated light source 10 is used to provide a collimated light beam. The collimated light beam refers to a light beam (such as a laser beam) with a small beam divergence angle, so that the light beam radius does not change significantly after a certain propagation distance, and the image is projected by the collimated light beam, which is beneficial to improving the image contrast.

The collimated light source 10 may comprise: a light source 11 and a collimation system 12. Illustratively, the light source 11 is configured to provide an incident light beam, and the collimating system 12 is configured to collimate the incident light beam to obtain a collimated light beam.

The light source 11 may refer to at least one of an LED light source and a laser light source. For example, the light source 11 may be a light source array including a plurality of uniformly distributed light emitters.

Taking the LED light source as an example, the light source 11 in fig. 1 includes 6 groups of uniformly distributed LED light sources, but it is needless to say that other numbers of LED light sources may be included, and each group of LED light sources may include one or more LEDs, which is not limited by the present application.

Alternatively, the collimating system 12 may comprise a collimating lens, a lens group, or the like.

For example, the collimating lens refers to an instrument capable of changing light from each point in the aperture stop into a parallel beam of collimated light, the lens group can be used to perform angle correction on the beam output by the collimating lens, and the specific implementation of the collimating system 12 is not limited by the present application.

The compound eye 20 is used for carrying out light homogenizing treatment on the collimated light beam to obtain a light beam 1.

The compound eye 20 may include two lens arrays: a first group of lens arrays and a second group of lens arrays, each group of arrays comprising a plurality of uniformly arranged lenses.

Taking fig. 1 as an example, the first lens array is a light input surface lens array on the left side of the compound eye 20, and the second lens array is a light output surface lens array on the right side of the compound eye 20: the collimated light beam passes through the first group lens array to obtain an intermediate light beam, and the intermediate light beam passes through the second group lens array to obtain a first light beam.

In this embodiment, after the light beam is processed by the compound eye, the first light beam output by the light emitting surface of the compound eye is more uniformly distributed, and after the diaphragm shields part of the light in the first light beam, the light beam corresponding to the dark state light leakage area can be shielded without losing too much other light beams, so that the image contrast of the projection image is improved.

With continued reference to the optical path in fig. 1, the light beam 1 passes through the first diaphragm 31 to obtain the light beam 2, where the first diaphragm 31 is used to block a part of light in the light beam 1.

As shown in fig. 2, fig. 2 is a schematic view of blocking light by a diaphragm according to an embodiment of the present application, in the optical path transmission process, the first diaphragm 31 is located before the imaging system 40, and the sub-beam 1 in the beam 1 is blocked by the first diaphragm 31, so that the beam 2 does not include the sub-beam 1.

Because the light beam 1 is obtained by carrying out light homogenizing treatment on the collimated light beam by the compound eye, each sub-light beam in the light beam 1 is uniformly distributed, and part of light in the light beam 1 is collimated and shielded by the first diaphragm 31, so that dark state light leakage of the projection equipment is reduced, and the image contrast of a projection image output by the projection equipment is improved.

The imaging system 40 is configured to generate an image to be projected from the light beam 2, and the projection unit 50 is configured to project the image to be projected.

The projection unit 50 may also be referred to as a projection objective, which comprises a plurality of lenses, for example.

In this embodiment, the aperture in the projection device may be used to block part of the light (sub-beam 1) in the beam 1, and in the case where the part of the light may cause a bright spot (dark state light leakage) of the projection image in the black field, the aperture may be used to block the bright spot, so as to reduce dark state light leakage of the projection device and improve the image contrast of the projection image output by the projection unit for projecting the fourth beam.

In an alternative implementation, the projection device further includes: and a second diaphragm. As shown in fig. 3, fig. 3 is a schematic diagram of a second structure of a projection apparatus according to an embodiment of the present application, where the second diaphragm 32 is located between the imaging system 40 and the projection unit 50, and the second diaphragm 32 is used for shielding a portion of light in an image to be projected output by the imaging system 40.

For example, the second diaphragm 32 is perpendicular to the transmission light path (the light path between the imaging system 40 and the projection unit 50) such that the light before the second diaphragm 32 cannot pass through the second diaphragm 32. It is noted that when the diaphragm is disposed between different optical devices, light leakage due to light reflection can be avoided, which is advantageous for improving the image contrast of the projected image.

The specific implementation of the second diaphragm 32 for blocking light can refer to the relevant content of fig. 2, and will not be described herein.

In this embodiment, the aperture in the projection device may be further used to block part of light in the image to be projected, and in the case where there is dark state light leakage in the image to be projected, the aperture may be used to block bright spots in the dark state light leakage, so as to reduce dark state light leakage of the projection device and improve image contrast of the projection image output by the projection unit for projecting the fourth light beam.

While fig. 1 and 3 above are described with respect to the position of the diaphragm, the projection device may be disposed only between the imaging system 40 and the projection unit 50, which is not described in detail in the present application.

With respect to the above imaging system, one possible implementation is provided by an embodiment of the present application, the imaging system 40 includes: a polarization processing unit, a polarization beam splitter, an optical modulator, and a phase compensation plate. The polarization processing unit is used for processing the light beam 2 to obtain a single polarized light beam, and the vibration surface of the single polarized light beam is limited to a certain fixed direction.

Illustratively, the light modulator may include LCos.

Example 1, as shown in fig. 4A, fig. 4A is a schematic structural diagram of a projection device according to an embodiment of the present application, and an imaging system 40 includes: a polarization converter 41, a lens 42 and a polarizer 43, and a polarization beam splitter 44, a phase compensation plate 45, a 1/4 wave plate LCos and an analyzer 46.

Wherein the polarized light converter 41, the lens 42 and the polarizer 43 may be collectively referred to as a polarization processing unit. For example, the light beam 2 passes through the polarization converter 41 to obtain a first intermediate light beam, which passes through the lens 42 to obtain a second intermediate light beam, and the second intermediate light beam passes through the polarizer to obtain a single polarized light beam.

In one example, the polarization converter is configured to convert light beams emitted from the compound eye into light beams, transmit S-polarized light and reflect P-polarized light, and the 1/2 wave plate in the polarization converter converts the P-polarized light into S-polarized light, where the transmitted S-polarized light and the converted S-polarized light are combined into one S-polarized light and transmitted to the lens 42; the lens 42 is used for adjusting the angle of the S polarized light and reducing the loss of the S polarized light; the polarizer 43 is used to improve the purity of the S polarized light in the light beam emitted from the lens 42, and avoid the problem of image contrast reduction caused by the mixing of the light beams with other polarization states.

In another example, the polarization converter is configured to convert light beams emitted from the compound eye into light beams, transmit P-polarized light and reflect S-polarized light, and the 1/2 wave plate in the polarization converter converts the S-polarized light into P-polarized light, where the transmitted P-polarized light and the converted P-polarized light are combined into a beam of P-polarized light, and the P-polarized light is transmitted to the lens 42; the lens 42 is used for adjusting the angle of the P polarized light and reducing the loss of the P polarized light; the polarizer 43 is used to improve the purity of P polarized light in the light beam emitted from the lens 42, and avoid the problem of image contrast reduction caused by mixing of light beams with other polarization states.

The light beam 2 is transmitted through the polarization processing unit to obtain a single polarized light beam, the single polarized light beam is reflected by the polarization beam splitter 44 to obtain a reflected light beam, the reflected light beam is modulated by the light modulator (LCos) to obtain a modulated light beam, and the modulated light beam is transmitted through the phase compensation plate 45 and the polarization beam splitter 44 to obtain an image to be projected.

In some possible cases, an analyzer 46 in the imaging system 40 is used to detect the polarization state used to detect a certain beam of light (the image to be projected).

For optical path transmission in a polarization processing unit, the present example provides one possible implementation: the light beam 2 passes through the polarization converter 41 to obtain a first intermediate light beam, which passes through the lens to obtain a second intermediate light beam, which passes through the polarizer 43 to obtain a single polarized light beam.

It should be noted that example 1 above is merely one beam transmission method of the imaging system 40 provided in the embodiment of the present application, and example 2 below also provides another beam transmission method.

As shown in fig. 4B, fig. 4B is a schematic structural diagram of a projection device according to an embodiment of the present application, where the imaging system 40 includes: a polarization converter 41, a lens 42 and a polarizer 43, and a polarization beam splitter 44, a phase compensation plate 45, a 1/4 wave plate LCos and an analyzer 46.

The light beam 2 is transmitted through the polarization processing unit to obtain a single polarized light beam, the single polarized light beam passes through the polarization beam splitter 44 and the phase compensation sheet 45 to reach the light modulator (LCos), the light beam reaching the light modulator (LCos) is modulated by the light modulator to obtain a modulated light beam, and the modulated light beam passes through the phase compensation sheet 45 and the polarization beam splitter 44 to reflect to obtain an image to be projected.

For example, in the projection device for reducing dark state light leakage according to the embodiment of the present application, an incident light source, such as a Micro LED, emits a light beam to a compound eye for homogenizing, and the phase difference and LCoS (light modulator) are compensated by a phase compensation plate and reflected to a projection objective module for displaying an image (projection image).

It should be noted that the above example is described by taking the optical modulator including LCos as an example, but the optical modulator may also include an optical device based on a Liquid crystal display (Liquid CRYSTAL DISPLAY, LCD) technology, an optical device based on a Digital Light Processing (DLP) technology, or the like, which is not limited by the present application.

With respect to the dark state light leakage in the above embodiments and the effect of the aperture in the projection apparatus, one possible example is provided below.

In the case where the device inside the system is not ideal and polarized light has a certain oblique incidence angle, when defining that the propagation internal angle of the light beam in the propagation process is (θ, Φ), where θ is the incident angle of the light beam and Φ is the azimuth angle of the light beam, as shown in (a) of fig. 5, two perpendicular unit vectors of the polarized device are c ₁,c₂, the incident wave vector in the polarized medium can be written as:

The dark state light leakage in the range of c ₁＝x,c₂ =y can therefore be written as the following expression:

and θ is related to the external angle of the incident beam according to snell's law, as shown in (b) of fig. 5.

In our LCoS projection display system example, although a phase compensation sheet has been added to perform phase compensation, the entire system still has dark state light leakage. As shown in fig. 5 (c), the dark state light leakage of the system without the diaphragm is calculated, the total light leakage is 0.07% and the dark state light leakage area is large.

In order to further compensate for the dark state light leakage condition of the LCoS projection display system after the phase compensation of the phase compensation sheet, according to the object-image relationship h= ftan θ of projection optics, where h is the object height (in the present application, refers to the corresponding spot size at the compound eye), f is the overall focal length of the collimation system and the compound eye in the projection device, θ is the beam angle (in the present application, refers to the beam angle incident to LCos), it can be determined that when the incident beam provided by the light source passes through the collimation system and the compound eye, the light signal is converted from the plane distribution to the angular distribution, so that according to the angular distribution of dark state light leakage, a special-shaped diaphragm with special structural design can be added at the aperture diaphragm of the projection objective module or behind the compound eye to block the light with corresponding angle (as shown in fig. 1 or fig. 3). Fig. 5 (d) shows the dark state light leakage after the addition of the special-shaped diaphragm, and it is not difficult to find that the total light leakage is reduced from 0.07% to 0.05%, and the area of dark state light leakage is reduced.

As a possible case, the aperture in the above embodiment may be a polygonal (e.g., triangular, quadrangular, hexagonal, etc.) aperture, a circular aperture, an elliptical aperture, or an aperture of another shape (a shaped aperture), which is not limited by the present application.

In an alternative implementation manner, the embodiment of the present application provides a projection device further including: and a control unit. This control unit may be referred to as a very large scale integrated circuit. An operating system and other software programs are installed in the control unit that enable the control unit to access memory and various peripheral component interconnect express (PERIPHERAL COMPONENT INTERCONNECT EXPRESS, PCIe) devices. The control unit includes one or more processor cores (cores). The processor core in the control unit is, for example, a central processing unit (Central Processing unit, CPU) or other Application SPECIFIC INTEGRATED Circuit (ASIC). The control unit may also be other general purpose processors, digital Signal Processors (DSP), application Specific Integrated Circuits (ASIC), field programmable gate arrays (field programmable GATE ARRAY, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. In practice, the projection device may also comprise a plurality of control units.

In one possible example, the control unit may be used to turn off the sub-light sources corresponding to the dark state light leakage region in the light source 11.

As shown in fig. 6, fig. 6 is a schematic diagram illustrating adjustment of dark state light leakage according to an embodiment of the present application, in order to reduce dark state light leakage in a projected image, an output surface of a compound eye 20 includes 4 groups of lenses (e.g. gray areas in fig. 6) without light output, and a control unit may turn off sub-light sources corresponding to the 4 groups of lenses in a light source 11.

In another possible example, the control unit may further be configured to reduce the luminance of the sub-light sources corresponding to the dark state light leakage region among the light sources.

As shown in fig. 6, the control unit reduces the brightness of the sub-light sources 11 of the light sources corresponding to the dark state light leakage region (e.g., gray region in fig. 6).

In this embodiment, the control unit performs regional adjustment on the incident light source, which is favorable for reducing part of light output by the light-emitting surface in the compound eye, so as to further reduce the problem of dark state light leakage, improve the image contrast of the projection image, turn off the sub-light sources or reduce the brightness of the sub-light sources, and also is favorable for reducing the energy consumption of the projection device and saving the cost of light display.

In some alternative implementations, the control unit may also be used to adjust the position of the diaphragm.

In an alternative example, the control unit is further configured to adjust the position of the first diaphragm 31, so that the adjusted first diaphragm 31 blocks the light beam corresponding to the dark state light leakage region.

In another alternative example, the control unit is configured to adjust the position of the second diaphragm 32, so that the adjusted second diaphragm 32 blocks the light beam corresponding to the dark state light leakage region.

As an alternative implementation manner, the embodiment of the application further provides a light module, which comprises a collimated light source and a control unit. The control unit is used for turning off the sub-light source corresponding to the dark state light leakage area in the light source or reducing the brightness of the sub-light source corresponding to the dark state light leakage area in the light source.

For example, in the dark state light leakage angle area, the incident light source LED array is divided into a plurality of areas according to the Local dimming technology, meanwhile, the brightness of each area is independently controlled, when the dark state light leakage condition occurs, the brightness of the regional light source LED corresponding to the dark state light leakage angle is weakened or even closed, and the bright and dark angle area of the compound eye light exit surface is modified according to the object image relationship h=f tan θ, so that the dark state light leakage angle area is avoided, and the contrast ratio is improved.

For more details about the collimated light source, reference is made to the relevant description of fig. 1, which is not repeated here. The specific implementation of the control unit may refer to the related description of fig. 6, and will not be described herein.

The embodiment of the application also provides a display device, which comprises the projection device and a processor, wherein the processor is used for sending the image data of the picture to be projected to the projection device.

The display device is used for illustrating a scene of the conference room, the display device is a projector for the conference, the projection surface is a wall surface or a projection curtain surface in the conference room, and the environment brightness of the projection surface is the environment brightness in the conference room. When the environment in the conference room becomes dark, the control unit in the projector can adjust the position of the diaphragm, so that the brightness of the projection image is adjusted to be low, the contrast is increased, and the viewing experience of a user in the dark environment is improved.

In one possible application scenario, the display device of the present application is integrated with a near-to-eye display (NEAR EYE DISPLAY, NED) device, and the NED device may be, for example, an AR device or a VR device, which may include, but is not limited to, AR glasses or AR helmets, and the VR device may include, but is not limited to, VR glasses or VR helmets. Taking AR glasses as an example, a user may wear an AR glasses device to play games, watch videos, participate in virtual meetings, or video shopping, etc.

It should be noted that, the display device provided in the embodiment of the present application may be a plurality of types of display devices, for example, a home projector, a cinema projector, a head-up display (HUD) device, or the like, or a micro-projection system, or the like. The embodiment of the application does not limit the type of the display equipment.

The application can be applied to the technical field of optical display, intelligent vehicle-mounted display systems, families, medical projection display fields and the like, and projection equipment and display equipment can be used for optimizing optical paths and improving optical display effects so as to construct a more perfect practical optical system.

In some alternative implementations, the display device may also refer to a vehicle lamp or the like having a projection function, which may be mounted on a different vehicle.

The embodiment of the application also provides a vehicle, which comprises the projection equipment or the light module. For example, the vehicle may include, but is not limited to: automobiles (sedans, vans, electric or other vehicles, etc.), motorcycles or the like.

Vehicles include, but are not limited to, electric vehicles, fuel vehicles, engineering vehicles, farm vehicles, aircraft, ship, and the like. The projection device is a vehicle-mounted HUD which is in communication connection with a driving assistance system (ADVANCED DRIVING ASSISTANTSYSTEM, ADAS) of the vehicle, the HUD receives driving assistance information input by an ADAS (advanced automatic analysis system), such as information of vehicle speed, navigation and the like, then generates an image through a PGU, and then projects the image onto a windshield to form a real image, or forms an enlarged virtual image observed by human eyes in front of the vehicle through a curved mirror and a windshield for a driver to make driving reference.

In-vehicle HUDs include, but are not limited to, C-HUDs, W-HUDs, and AR-HUDs.

Wherein, C-HUD is early HUD, C is the first letter of Combier, combier is the optical lens that both transmits and reflects the light beam, the instrument information image that PGU shows is projected on Combier through the speculum (perhaps also not) and finally reflected to the human eye, forms the virtual image in the front of human eye. The C-HUD is a stand-alone device that is placed over the steering wheel or center console, and therefore is also called a post-load HUD. The C-HUD has a small angle of view and displays simple information, but it is neither attractive nor safe to place in front of the driver.

And W-HUD, W is the first letter of the windshield word WINDSHIELD, when applied to a vehicle, unlike the C-HUD, the PGU produces an image that is projected onto the windshield and reflected to the human eye, forming a virtual image in front of the vehicle, because of integration with the vehicle body, which is also called front-loading HUD. Compared with the C-HUD, the W-HUD can have a larger field angle, can display more information, is integrated with a vehicle body, and is safer and more attractive. With the development of automobile technology and the proposal of more application scenes, the development trend of HUD is augmented reality AR-HUD, which is a technology for displaying virtual information such as navigation on a road surface or other external objects in a superimposed manner, can display richer information, and provides better driving experience and application scenes. The technical scheme of the AR-HUD is the same as that of the W-HUD, and the difference is that the virtual image distance (the distance from a virtual image to human eyes) of the W-HUD is between 2 and 3m, the AR-HUD is generally larger than 5m, the larger virtual image distance can show better virtual-real combination effect, and in addition, the AR-HUD has larger field angle so as to promote augmented reality experience. The virtual image displayed by the AR-HUD needs to be combined with the real scene, which requires accurate positioning and detection of the car, so the AR-HUD needs to cooperate with the ADAS system of the car.

It is noted that the vehicle may further comprise a reflective element, the above display device being adapted to emit a light beam towards the reflective element, the reflective element being adapted to reflect the light beam emitted by the display device, thereby displaying the projected image.

The method steps in this embodiment may be implemented by hardware, or may be implemented by executing software instructions by a processor. The software instructions may be comprised of corresponding software modules that may be stored in random access memory (random access memory, RAM), flash memory, read-only memory (ROM), programmable ROM (PROM), erasable programmable ROM (erasable PROM, EPROM), electrically Erasable Programmable ROM (EEPROM), registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in a computing device. The processor and the storage medium may reside as discrete components in a network device or terminal device.

The application also provides a chip system which comprises a processor and is used for realizing the functions of the data processing unit in the method. In one possible design, the chip system further includes a memory for holding program instructions and/or data. The chip system can be composed of chips, and can also comprise chips and other discrete devices.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network device, a user device, or other programmable apparatus. The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired or wireless means. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, e.g., floppy disk, hard disk, tape; but also optical media such as digital video discs (digital video disc, DVD); but also semiconductor media such as Solid State Drives (SSDs) STATE DRIVE.

While the application has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims

1. A projection device, comprising: the system comprises a collimation light source, a compound eye, an imaging system, a projection unit and a first diaphragm, wherein the first diaphragm is positioned between the compound eye and the imaging system;

the collimated light source is used for providing a collimated light beam;

The compound eye is used for carrying out dodging treatment on the collimated light beam to obtain a first light beam;

the first light beam passes through the first diaphragm to obtain a second light beam, wherein the first diaphragm is used for shielding part of light in the first light beam;

The imaging system is used for generating an image to be projected according to the second light beam;

The projection unit is used for projecting the image to be projected.

2. The projection device of claim 1, further comprising: the second diaphragm is positioned between the imaging system and the projection unit, and is used for shielding part of light in the image to be projected, which is output by the imaging system.

3. The projection device of claim 1 or 2, wherein the collimated light source comprises: a light source and a collimation system;

The light source is used for providing an incident light beam;

the collimation system is used for collimating the incident light beam to obtain a collimated light beam.

4. A projection device as claimed in claim 3, wherein the light source comprises at least one of a light emitting diode, LED, light source and a laser light source.

5. The projection device of claim 3 or 4, further comprising:

The control unit is used for turning off the sub-light sources corresponding to the dark state light leakage area in the light source; or reducing the brightness of the sub-light sources corresponding to the dark state light leakage region in the light source.

6. The projection apparatus according to claim 5, wherein the control unit is further configured to adjust a position of the first diaphragm such that the adjusted first diaphragm blocks a light beam corresponding to a dark state light leakage region.

7. The projection device of claim 2, further comprising:

and the control unit is used for adjusting the position of the second diaphragm to enable the adjusted second diaphragm to shade the light beam corresponding to the dark state light leakage area.

8. The projection device of any of claims 1-7, wherein the compound eye comprises a first set of lens arrays and a second set of lens arrays, each set of lens arrays comprising a plurality of uniformly arranged lenses.

9. The projection device of any of claims 1-8, wherein the imaging system comprises: a polarization processing unit, a polarization beam splitter, an optical modulator and a phase compensation plate;

The second light beam penetrates through the polarization processing unit to obtain a single polarized light beam;

The single polarized light beam is reflected by the polarization beam splitter to obtain a reflected light beam;

the reflected light beam is modulated by the light modulator to obtain a modulated light beam;

and the modulated light beam penetrates through the phase compensation sheet and the polarization beam splitter to obtain the image to be projected.

10. The projection device of any of claims 1-8, wherein the imaging system comprises: a polarization processing unit, a polarization beam splitter, an optical modulator and a phase compensation plate;

The single polarized light beam penetrates through the polarization beam splitter and the phase compensation sheet to obtain a compensated light beam;

the compensated light beam is modulated by the light modulator to obtain a modulated light beam;

The modulated light beam is reflected by the polarization beam splitter to obtain the image to be projected.

11. Projection device according to claim 9 or 10, characterized in that the polarization processing unit comprises: a polarized light converter, a lens and a polarizer;

The second light beam penetrates through the polarized light converter to obtain a first intermediate light beam;

The first intermediate beam penetrates through the lens to obtain a second intermediate beam;

the second intermediate beam is transmitted through the polarizer to obtain the single polarized beam.

12. The projection device of any of claims 9-11, wherein the light modulator comprises: liquid crystal on silicon LCos.

13. A display device, characterized by comprising: a processor and the projection device of any of claims 1-12, the processor to send image data of a picture to be projected to the projection device.

14. A vehicle, the vehicle comprising: a reflective element for emitting a light beam to the reflective element and the display device of claim 13 for reflecting the light beam emitted by the display device.