Projector optical engine, display device, and vehicle

Abstract

A projector optical engine, a display device, and a vehicle are provided, which belong to the field of image display technology. The projector optical engine includes a first light uniformizing device (1), a red-green light providing component (2), a first dichroic mirror (3), a second light uniformizing device (4), a blue light providing component (5), a converging lens (6), and an imaging component (7). The first light uniformizing device (1) is located in the optical path between the red-green light providing component (2) and the first dichroic mirror (3), and the second light uniformizing device (4) is located in the optical path between the first dichroic mirror (3) and the blue light providing component (5). The red-green light beam provided by the red-green light providing component (2) and the blue light beam provided by the blue light providing component (5) are respectively transmitted through and reflected by the first dichroic mirror (3) and combined into one beam, and a focusing lens (6) is located in the optical path between the first dichroic mirror (3) and the imaging component (7), so that the volume of the projector optical engine is small and the impact of degradation of blue light can be reduced.

Description

[Technical field]

[0001] The present application relates to the field of image display technology, and in particular to projector optical engines, display devices, and vehicles. [Background technology]

[0002] The projector optical engine is a device that provides illumination light for a spatial light modulator to generate image light, images the image light through a lens, and then projects the image light onto a screen.

[0003] In the prior art, a projector optical engine includes a three-color light collecting and collimating component, a dichroic mirror, a light uniformizing device, a converging lens, and an imaging component, and the imaging component includes a polarizing beam splitter, a spatial light modulator, and a lens. The three-color light collecting and collimating component collimates the three-color light. The dichroic mirror combines the collimated three-color light into one light beam. The light uniformizing device performs a light uniformizing process on the light beam. The converging lens converges the light beam obtained by the light uniformizing process and transmits the light beam to the imaging component. The light beam is used for imaging to the imaging component as the illumination light of the imaging component. The light uniformizing process is performed only after the three-color light is combined into one beam, and a certain distance needs to be kept between the light uniformizing device and the converging lens, so the volume of the projector optical engine is large. Summary of the Invention

[0004] The present application provides a projector optical engine, a display device, and a vehicle, and the projector optical engine has a small volume.

[0005] According to a first aspect, the present application provides a projector optical engine. The projector optical engine includes a first light uniformizing device, a red-green light providing component, a first dichroic mirror, a second light uniformizing device, a blue light providing component, a converging lens, and an imaging component. The first light uniformizing device is located in an optical path between the red-green light providing component and the first dichroic mirror. The second light uniformizing device is located in an optical path between the first dichroic mirror and the blue light providing component. A red-green light beam provided by the red-green light providing component and a blue light beam provided by the blue light providing component are respectively transmitted through the first dichroic mirror and reflected through the first dichroic mirror, and combined into one beam. The converging lens is located in an optical path between the first dichroic mirror and the imaging component. The imaging component is configured to perform imaging on the light output by the converging lens and output imaging light. The projector optical engine may also be referred to as a projection device.

[0006] In the solution presented in this application, the red-green light and the blue light correspond to the first light uniformizing device and the second light uniformizing device respectively, and the blue light providing component, the second light uniformizing device, and the first dichroic mirror are arranged between the first light uniformizing device and the focusing lens. In this way, when a certain distance is maintained between the first light uniformizing device and the focusing lens, the blue light providing component, the second light uniformizing device, and the first dichroic mirror are arranged to fully utilize the distance, so that the volume of the projector optical engine is reduced. In addition, the blue light beam passes through the second light uniformizing device independently. Even if the blue light aging problem occurs in the second light uniformizing device, only the blue light beam is affected, so that the impact caused by the blue light aging can be reduced.

[0007] In a possible embodiment, the projector optical engine further includes a first polarization conversion system (PCS) and a second polarization conversion system, the first polarization conversion system being located in the optical path between the first light uniformizing device and the first dichroic mirror, and the second polarization conversion system being located in the optical path between the second light uniformizing device and the first dichroic mirror.

[0008] In the solution presented in this application, when the red-green light beam output by the red-green light providing component is natural light, the first polarization conversion system is arranged to convert the red-green light beam into polarized light, so that the light loss can be reduced when the red-green light beam subsequently passes through the polarizing beam splitter. When the blue light beam output by the blue light providing component is natural light, the second polarization conversion system is arranged to convert the blue light beam into polarized light, so that the light loss can be reduced when the blue light beam subsequently passes through the polarizing beam splitter.

[0009] In a possible embodiment, the projector optical engine further comprises a first polarization conversion system, the first polarization conversion system being located in the optical path between the first light homogenizing device and the first dichroic mirror.

[0010] In the solution presented in this application, when the red-green light beam output by the red-green light providing component is natural light, the first polarization conversion system is arranged to convert the red-green light beam into polarized light, so that the loss of the red-green light can be reduced when the red-green light subsequently passes through the polarizing beam splitter, and because the proportion of the blue light beam is low, even if the loss of blue light occurs after the blue light beam passes through the polarizing beam splitter, the light efficiency of the projector optical engine is only slightly affected.

[0011] In a possible embodiment, the first light uniformizing device is a compound lens, a free-form lens, or an integrator rod, and the second light uniformizing device is a compound lens, a free-form lens, or an integrator rod. In this way, multiple forms of light uniformizing devices can be provided.

[0012] In a possible embodiment, the red-green light providing component includes a first condenser lens group, a red light source, a second dichroic mirror, a second condenser lens group, and a green light source. The first condenser lens group is located in the optical path between the red light source and the second dichroic mirror. The second condenser lens group is located in the optical path between the green light source and the second dichroic mirror. A red light beam provided by the red light source and a green light beam provided by the green light source are combined into a red-green light beam via the second dichroic mirror. The red light source is a laser diode (LD) light source or a light-emitting diode (LED) light source. The green light source is an LD light source or an LED light source.

[0013] In the solution presented in this application, a red light source provides a red light beam, a green light source provides a green light beam, and the red light beam and green The colored light beams are combined into a red-green light beam via a dichroic mirror.

[0014] In a possible embodiment, the blue light providing component includes a blue light source and a third condenser lens group. The blue light source is a LD light source or a LED light source. Thus, a blue light providing component is provided.

[0015] In a possible embodiment, the converging lens comprises an integral lens and / or a focusing lens.

[0016] In a possible embodiment, the imaging component includes a beam splitter, a reflective spatial light modulator, and a lens, the beam splitter being located in the optical path between the converging lens and the reflective spatial light modulator, and the reflective spatial light modulator and the lens, thus providing an imaging component.

[0017] In a possible embodiment, the beam splitter is a polarizing beam splitter and the reflective spatial light modulator is liquid crystal on silicon (LCOS), or the beam splitter is a beam splitter prism and the reflective spatial light modulator is a digital micromirror device (DMD).

[0018] The solution presented in this application includes multiple beam splitters and reflective spatial light modulators that can be used in the projector optical engine.

[0019] In a possible embodiment, the polarizing beam splitter is a metallic wire-grid polarization beam splitter (WGP).

[0020] In the solution presented in this application, the polarizing beam splitter is a WGP, which is relatively insensitive to the incidence angle of the incident light, and the change in the incidence angle has a relatively small effect on the contrast of the projector optical engine, so that the contrast of the projector optical engine can be relatively stable.

[0021] In a possible embodiment, the imaging component includes a lens and a liquid crystal display (LCD), the LCD being located in the optical path between the converging lens and the lens. In this way, the imaging component can also be realized using an LCD and a lens.

[0022] According to a second aspect, the present application provides a display device, comprising a projector optical engine as shown in the first aspect or any possible embodiment, and a reflective component configured to reflect a light beam output by the projector optical engine.

[0023] In a possible embodiment, the display device further includes a diffusion screen, the diffusion screen being located in the optical path between the projector optical engine and the reflective component and configured to diffuse the imaging light output by the projector optical engine. In this manner, the diffusion screen can be configured to increase the viewing angle of the imaging image.

[0024] According to a third aspect, the present application provides a vehicle, the vehicle including a windshield and a display device as shown in the first aspect or a possible implementation of the first aspect. For example, the vehicle may include, but is not limited to, a car, an airplane, a train, a boat, etc. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 illustrates the structure of a projector optical engine according to an exemplary embodiment of the present application. [Diagram 2] FIG. 1 illustrates the structure of a projector optical engine according to an exemplary embodiment of the present application. [Diagram 3] FIG. 1 illustrates the structure of a projector optical engine according to an exemplary embodiment of the present application. [Figure 4] FIG. 1 illustrates the structure of a projector optical engine according to an exemplary embodiment of the present application. [Diagram 5] FIG. 1 illustrates the structure of a projector optical engine according to an exemplary embodiment of the present application. [Figure 6] FIG. 1 illustrates the structure of a projector optical engine according to an exemplary embodiment of the present application. [Figure 7] FIG. 1 illustrates the structure of a projector optical engine according to an exemplary embodiment of the present application. [Figure 8]FIG. 1 illustrates the structure of a projector optical engine according to an exemplary embodiment of the present application. [Figure 9] FIG. 1 illustrates the structure of a projector optical engine according to an exemplary embodiment of the present application. [Figure 10] FIG. 1 is a diagram showing a structure of a display device according to an exemplary embodiment of the present application. [Figure 11] FIG. 1 illustrates a vehicle structure according to an exemplary embodiment of the present application.

[0026] Reference sign: 1: first light homogenizing device; 2: red-green light providing component; 3: first dichroic mirror; 4: second light homogenizing device; 5: blue light providing component; 6: converging lens; 7: imaging component; 8: first polarization conversion system; 9: second polarization conversion system; 21: first condenser lens group; 22: red light source; 23: second dichroic mirror; 24: second condenser lens group; 25: green light source; 51: blue light source; 52: third focusing lens group; 71: beam splitter; 72: reflective spatial light modulator; 73: lens; 74: LCD; 01: reflective component; 02: diffusion screen; 10: windshield. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] In order to make the objectives, technical solutions and advantages of the present application clearer, the following describes the embodiments of the present application in more detail with reference to the accompanying drawings.

[0028] An embodiment of the present application provides a projector optical engine. The projector optical engine can be used in audio and video entertainment scenarios and assisted driving scenarios. The projector optical engine can be used alone or can be integrated as a component in other devices. For example, the projector optical engine can be integrated in a head-up display (HUD) device of a vehicle, a head-mounted display device, or an optical desktop display device. The projector optical engine can be integrated in these devices and used as a picture generation unit (PGU) of these devices.

[0029] FIG. 1 is a diagram showing the structure of a projector optical engine. As shown in FIG. 1, the projector optical engine includes a first light uniformizing device 1, a red-green light providing component 2, a first dichroic mirror 3, a second light uniformizing device 4, a blue light providing component 5, a converging lens 6, and an imaging component 7. The first light uniformizing device 1 is located in the optical path between the red-green light component 2 and the first dichroic mirror 3. The second light uniformizing device 4 is located in the optical path between the first dichroic mirror 3 and the blue light providing component 5. The converging lens 6 is located in the optical path between the first dichroic mirror 3 and the imaging component 7.

[0030] The red-green light providing component 2 outputs a red-green light beam including red light and green light, and the red-green light beam is incident on the first light homogenizing device 1. The first light homogenizing device 1 performs a light homogenizing process on the red-green light beam, so that the red-green light beam becomes more homogenous. The red-green light beam is incident on the first dichroic mirror 3. In addition, the blue light providing component 5 outputs a blue light beam, and the blue light beam is incident on the second light homogenizing device 4. The second light homogenizing device 4 performs a light homogenizing process on the blue light beam, so that the blue light beam becomes more homogenous. The blue light beam obtained by the light homogenizing process is incident on the first dichroic mirror 3. The first dichroic mirror 3 is configured to transmit the red-green light beam and reflect the blue light beam. The red-green light beam is transmitted from the first dichroic mirror 3, the blue light beam is reflected by the first dichroic mirror 3, and the red-green light beam transmitted by the first dichroic mirror 3 and the blue light beam reflected by the first dichroic mirror 3 are combined into a combined light beam, and the combined light beam includes red light, green light, and blue light. The combined light beam is incident on a converging lens 6, which is configured to converge the combined light beam. The combined light beam is incident on an imaging component 7 through the converging lens 6. The combined light beam is used as an illumination light for the imaging component 7. The imaging component 7 outputs the illumination light with the image content modulated after modulating the image content into the illumination light. The illumination light with the image content modulated may also be called imaging light.

[0031] In the projector optical engine 1 shown in FIG. 1, when it is necessary to keep a suitable distance between the light uniformizing device and the focusing lens 6, the red / green light beam and the blue light beam are subjected to light uniformizing processing separately and then beam-combined, and the first dichroic mirror 3, the second light uniformizing device 4, and the blue light providing component 5 are disposed between the first light uniformizing device 1 and the focusing lens 6. In this way, the size of the projector optical engine in the transmission direction of the light beam obtained by combining the red light, the green light, and the blue light is reduced, and therefore the volume of the projector optical engine can be reduced. In addition, the proportion of blue light in the white light is low, and the second light uniformizing device 4 performs light uniformizing processing separately on the blue light. After the degradation problem of the blue light occurs in the second light uniformizing device 4, only the output of the blue light is affected, but the output of the red / green light is not affected.

[0032] For example, when the red-green light beam provided by the red-green light providing component 2 is natural light and the blue light beam provided by the blue light providing component 5 is natural light, considering that the imaging component 7 uses polarized light, in order to improve light efficiency, the red-green light beam and the blue light beam are converted into polarized light before entering the imaging component 7. FIG. 2 is a diagram showing another structure of the projector optical engine. As shown in FIG. 2, the projector optical engine further includes a first polarization conversion system 8 and a second polarization conversion system 9. The first polarization conversion system 8 is located in the optical path between the first light uniformizing device 1 and the first dichroic mirror 3. The second polarization conversion system 9 is located in the optical path between the second light uniformizing device 4 and the first dichroic mirror 3. The first polarization conversion system 8 and the second polarization conversion system 9 are configured to convert the light beam into polarized light.

[0033] The red-green light providing component 2 outputs a red-green light beam including red light and green light, and the red-green light beam enters the first light uniformizing device 1. The first light uniformizing device 1 performs a light uniformizing process on the red-green light beam, so that the red-green light beam becomes more uniform. The red-green light beam enters the first polarization conversion system 8, and the first polarization conversion system 8 converts the red-green light beam into polarized light. The polarized red-green light beam enters the first dichroic mirror 3. In addition, the blue light providing component 5 outputs a blue light beam, and the blue light beam enters the second light uniformizing device 4. The second light uniformizing device 4 performs a light uniformizing process on the blue light beam, so that the blue light beam becomes more uniform. The blue light beam obtained by the light uniformizing process enters the second polarization conversion system 9, and the second polarization conversion system 9 converts the blue light beam into polarized light. The polarized blue light beam enters the first dichroic mirror 3. The red-green light beam and the blue light beam are combined into a combined light beam via a first dichroic mirror 3. The combined light beam includes red light, green light, and blue light. The combined light beam is incident on a converging lens 6, which is configured to converge the combined light beam. The combined light beam is incident on an imaging component 7 via the converging lens 6. The combined light beam is used as an illumination light for the imaging component 7, which modulates the image content into the illumination light and outputs it.

[0034] In this way, when the projector optical engine has a polarization requirement, the PCS converts natural light into polarized light to meet the polarization requirement in scenarios such as 3D and HUD. In particular, when the light modulator in the imaging component 7 is LCOS, the incident light beam of the imaging component 7 is converted into polarized light, so that the light efficiency can be improved and there is no need to add a polarizer to improve the contrast of the projector optical engine. The contrast is the contrast of the image obtained by performing imaging by the projector optical engine.

[0035] For example, the first light homogenizing device 1 is a compound lens, a free-form lens, or an integrator rod, and the second light homogenizing device 4 is a compound lens, a free-form lens, or an integrator rod. When the light homogenizing process is performed on polarized light, the first light homogenizing device 1 and the second light homogenizing device 4 are compound lenses.

[0036] For example, when the red-green light beam provided by the red-green light providing component 2 is natural light and the blue light beam provided by the blue light providing component 5 is natural light, considering that the imaging component 7 uses polarized light, in order to improve light efficiency, the red-green light beam is converted to polarized light before entering the imaging component 7, and the blue light beam is not converted to polarized light, and half of the blue light beam is lost in the imaging component 7. Because the proportion of the blue light beam in the white light system is low, the low brightness of the blue light has little effect on the contrast of the projector optical engine. Also, the brightness of the blue light can be further increased (e.g., the current of the blue light source is increased) to compensate for the loss of the blue light beam in the imaging component 7. Alternatively, the blue light source is a laser light source, and the output blue light beam is polarized light. FIG. 3 is a diagram showing another structure of the projector optical engine. As shown in FIG. 3, the projector optical engine further includes a first polarization conversion system 8. The first polarization conversion system 8 is located in the optical path between the first light homogenizing device 1 and the first dichroic mirror 3.

[0037] The red-green light providing component 2 outputs a red-green light beam including red light and green light, and the red-green light beam enters the first light uniformizing device 1. The first light uniformizing device 1 performs a light uniformizing process on the red-green light beam, so that the red-green light beam becomes more uniform. The red-green light beam enters the first polarization conversion system 8, and the first polarization conversion system 8 converts the red-green light beam into polarized light. The polarized red-green light beam enters the first dichroic mirror 3. In addition, the blue light providing component 5 outputs a blue light beam, and the blue light beam enters the second light uniformizing device 4. The second light uniformizing device 4 performs a light uniformizing process on the blue light beam, so that the blue light beam becomes more uniform. The blue light beam obtained by the light uniformizing process enters the first dichroic mirror 3. The red-green light beam and the blue light beam are combined into a combined light beam via the first dichroic mirror 3. The combined light beam includes red light, green light, and blue light. The combined light beam is incident on a converging lens 6, which is configured to converge the combined light beam. The combined light beam is incident on an imaging component 7 via the converging lens 6. The combined light beam is used as an illumination light for the imaging component 7, which modulates the image content into the illumination light and outputs it.

[0038] For example, the red and green light providing component 2 may include a first condensing lens group 21, a red light source 22, a second dichroic mirror 23, a second condensing lens group 24, and a green light source 25. The first condensing lens group 21 is located in the optical path between the red light source 22 and the second dichroic mirror 23. The second condensing lens group 24 is located in the optical path between the green light source 25 and the second dichroic mirror 23. The second dichroic mirror 23 is located in the optical path between the red light source 22 and the first light homogenizing device 1.

[0039] The red light source 22 is configured to output a red light beam, and the red light source 22 may be an LED light source or an LD light source. The red light source 22 outputs a red light beam, and the red light beam enters the second dichroic mirror 23 through the first condensing lens group 21, and the first condensing lens group 21 includes one or more lenses configured to focus and collimate the red light beam. The green light source 25 is configured to output a green light beam, and the green light source 25 may be an LED light source or an LD light source. The green light source 25 outputs a green light beam. The green light beam enters the second dichroic mirror 23 through the second condensing lens group 24, and the second condensing lens group 24 includes one or more lenses configured to focus and collimate the green light beam. After passing through the second dichroic mirror 23, the red light beam and the green light beam are combined into a red-green light beam and enter the first light homogenizing device 1.

[0040] In one embodiment, the second dichroic mirror 23 is configured to reflect the red light beam and transmit the green light beam. As shown in Figure 4, the red light beam is reflected by the second dichroic mirror 23, the green light beam is transmitted by the second dichroic mirror 23, and the red light beam reflected by the second dichroic mirror 23 and the green light beam transmitted by the second dichroic mirror 23 are combined into a red-green light beam.

[0041] In another embodiment, the second dichroic mirror 23 is configured to transmit the red light beam and reflect the green light beam. As shown in Figure 5, the red light beam is transmitted from the second dichroic mirror 23 and the green light beam is reflected by the second dichroic mirror 23, and the red light beam transmitted by the second dichroic mirror 23 and the green light beam reflected by the second dichroic mirror 23 are combined into a red-green light beam.

[0042] The light output from the LED light source is natural light, and the light output from the LD light source is polarized light.

[0043] 4 and 5, the blue light providing component 5 includes a blue light source 51 and a third condensing lens group 52. The blue light source 51 is configured to output a blue light beam, and the blue light source 51 may be an LED light source or an LD light source. The third condensing lens group 52 includes one or more lenses configured to focus and collimate the blue light beam.

[0044] In this way, only one dichroic mirror is used before the red and green light beams enter the first light homogenizing device 1, and the light beams obtained by optical coupling slowly diverge as the distance increases, and no additional lenses are required to improve the light collection efficiency. Also, since the red, green and blue light beams pass through paths of similar length before entering the focusing lens 6, the first focusing lens group 21, the second focusing lens group 24 and the third focusing lens group 52 can use the same focusing lens group, which reduces the introduction of differential optical devices and reduces manufacturing difficulties.

[0045] For example, the focusing lens 6 includes an integrated lens and / or a focus lens. The integrated lens may have one or more lenses, and may design a certain number of lenses according to practical requirements. In the embodiment of the present application, only one lens is shown in the accompanying drawings. There may be one or more focus lenses.

[0046] For example, the imaging component 7 may have several configurations. The following shows two possible configurations:

[0047] In one embodiment, the imaging component 7 includes a beam splitter 71, a reflective spatial light modulator 72, and a lens 73. The beam splitter 71 is located in the optical path between the converging lens 6 and the reflective spatial light modulator 72, and is located in the optical path between the reflective spatial light modulator 72 and the lens 73. The beam splitter 71 is configured to output the combined light beam to the reflective spatial light modulator 72, which is configured to modulate image content onto the combined light beam, and the beam splitter 71 is further configured to output the image content modulated light beam to the lens 73, which is configured to perform imaging and output the imaging light.

[0048] In this manner, the combined light beam (the combined light beam includes a red light beam, a green light beam, and a blue light beam) incident on the beam splitter 71 is incident on the reflective spatial light modulator 72. The reflective spatial light modulator 72 modulates the image content onto the incident combined light beam, and then reflects the combined light beam with the modulated image content to the beam splitter 71. The beam splitter 71 outputs the combined light beam with the modulated image content to the lens 73. The lens 73 forms an image on the combined light beam with the modulated image content, and then outputs the imaging light.

[0049] Optionally, FIG. 6 illustrates another structure of the projector optical engine. As shown in FIG. 6, the beam splitter 71 is a polarizing beam splitter, and the reflective spatial light modulator 72 is an LCOS. The light beam incident on the polarizing beam splitter is transmitted from the polarizing beam splitter, and the light beam is incident on the LCOS. The LCOS modulates the image content onto the light beam, which outputs the light beam with the modulated image content to the polarizing beam splitter, which reflects the light beam with the modulated image content to the lens 73. Note that if the polarization state of the combined light incident on the focusing lens 6 is a P polarization state, the combined light can be completely transmitted from the polarizing beam splitter. Alternatively, if the combined light is natural light, only the light with the P polarization state of the combined light can be transmitted from the polarizing beam splitter. Since the light beam entering the LCOS is in a P-polarized state and the light beam leaving the LCOS is in an S-polarized state, the light beam with modulated image content is reflected by the polarizing beam splitter to lens 73 .

[0050] Alternatively, FIG. 7 is a diagram showing another structure of the projector optical engine. As shown in FIG. 7, the beam splitter 71 is a polarizing beam splitter, and the reflective spatial light modulator 72 is an LCOS. The light beam incident on the polarizing beam splitter is reflected by the polarizing beam splitter, and the light beam is incident on the LCOS. The LCOS modulates the image content into the light beam, and the LCOS outputs the light beam with the modulated image content to the polarizing beam splitter, and the polarizing beam splitter transmits the light beam with the modulated image content to the lens 73. Note that when the polarization state of the combined light incident on the focusing lens 6 is the S-polarized state, the combined light can be completely reflected by the polarizing beam splitter. Alternatively, when the combined light incident on the focusing lens 6 is natural light, only the light in the S-polarized state of the combined light can be reflected by the polarizing beam splitter. Since the light beam entering the LCOS is in the S-polarized state and the polarization state of the light beam output by the LCOS is the P-polarized state, the light beam with modulated image content is transmitted from the polarizing beam splitter to lens 73 .

[0051] The polarizing beam splitter may be a polarization beam splitter (PBS) or a WGP. When the polarizing beam splitter uses a WGP to perform polarization beam splitting, the sensitivity of the WGP to the incident angle of the incident light is low, so that the change in the incident angle has a small effect on the contrast of the projector optical engine.

[0052] Optionally, Fig. 8 illustrates the structure of a projector optical engine. As shown in Fig. 8, the beam splitter 71 is a beam splitter prism, and the reflective spatial light modulator 72 is a DMD. The light beam incident on the beam splitter prism is reflected by the beam splitter prism, the light beam is incident on the DMD, the DMD modulates the image content into the light beam, and the DMD outputs the image content modulated light beam to the beam splitter prism, and the image content modulated light beam is transmitted to the lens 73 by the beam splitter prism.

[0053] Alternatively, the beam splitter 71 is a beam splitter prism, and the reflective spatial light modulator 72 is a DMD. The light beam incident on the beam splitter prism is transmitted from the beam splitter prism, the light beam incident on the DMD, the DMD modulates the image content onto the light beam, the DMD outputs the image content modulated light beam to the beam splitter prism, and the image content modulated light beam is reflected by the beam splitter prism to the lens 73.

[0054] In addition, in the optical machine of the projector optical engine shown in Figures 6 to 8, the blue light providing component 5 and the lens 73 are located on the same side, specifically, the blue light providing component 5 and the lens 73 are located on the same side of the optical path between the converging lens 6 and the reflective spatial light modulator 72. In this way, when the blue light beam is reflected by the first dichroic mirror 3, both the blue light providing component 5 and the second light uniformizing device 4 are located on the same side as the lens 73, and the height of the blue light providing component 5 and the height of the second light uniformizing device 4 in the direction in which the blue light providing component 5 is located are lower than the height of the lens 73 in that direction, and the size of the projector optical engine in the direction in which the blue light providing component 5 is located does not increase.

[0055] In another embodiment, Fig. 9 illustrates another structure of the projector optical engine. As shown in Fig. 9, the imaging component 7 includes a lens 73 and an LCD 74, and the LCD 74 is located in the optical path between the focusing lens 6 and the lens 73. The combined light passing through the focusing lens 6 is incident on the LCD 74. The LCD 74 modulates an image content onto the combined light and outputs the image content modulated light beam to the lens 73. The lens 73 images the image content modulated light beam and outputs the imaging light.

[0056] An embodiment of the present application further provides a display device. Figure 10 is a diagram showing the structure of the display device. As shown in Figure 10, the display device includes the above-mentioned projector optical engine and a reflection component 01 configured to reflect the light beam output by the projector optical engine.

[0057] The projector optical engine outputs a light beam to the reflective component 01, which reflects the light beam to form a corresponding image.

[0058] Optionally, as shown in Fig. 10, the display device further includes a diffusion screen 02, which is located in the light path between the projector optical engine and the reflection component 01. The diffusion screen 02 is configured to receive the light beam output by the projector optical engine and to diffuse the light beam. The reflection component 01 reflects the light beam output by the diffusion screen 02 to form an image. Since the diffusion screen 02 diffuses the light beam, the formed image has a wide viewing angle.

[0059] Here, in case the imaging component 7 comprises an LCOS or a DMD, the display device may comprise a diffusion screen 02. In case the imaging component 7 comprises an LCD, the display device may not comprise a diffusion screen 02.

[0060] Optionally, the reflective component 01 may be a reflector, etc. For example, the reflective component 01 is a curved reflector.

[0061] Optionally, the reflective component 01 may be a windshield (also called a windshield) and form an image. The windshield may be the front windshield of a vehicle. The vehicle may include, but is not limited to, a car, an airplane, a train, or a boat. The display device may be a HUD, a desktop display, or an in-vehicle display, etc.

[0062] An embodiment of the present application further provides a vehicle. FIG. 11 is a diagram showing the structure of a vehicle. As shown in FIG. 11, the vehicle includes any of the display devices described above and a windshield 10. The windshield 10 is configured to reflect the light beam output from the projector optical engine to form an image in front of the driver. The image is a virtual image. When the display device outputs a light beam modulated with a plurality of different image contents, images of a plurality of different image contents are formed separately. FIG. 11 shows images corresponding to two image contents, namely, virtual image 1 and virtual image 2.

[0063] Optionally, the image is an augmented reality display image and is used to display information such as external object indicator information, including but not limited to safe following distances, surrounding obstacles, and reverse images, and navigation information, including but not limited to direction arrows, distance, and driving time.

[0064] Optionally, the image is a status image, used to display vehicle status information, using an automobile as an example, including but not limited to information such as driving speed, mileage, fuel level, water temperature, and vehicle light status.

[0065] Optionally, the images include an augmented reality display image and a status display image.

[0066] For example, vehicles may include automobiles, trucks, motorcycles, buses, boats, airplanes, helicopters, lawn mowers, recreational vehicles, playground vehicles, construction equipment, streetcars, golf carts, trains, trolleys, and the like.

[0067] Please note that the above parts can be randomly combined without violating the logic, which is not limited in the embodiments of this application.

[0068] In this application, terms such as "first" and "second" are used to distinguish between the same or similar items having essentially the same function. It should be understood that there is no logical or chronological order dependency between "first" and "second", and the quantity and execution order are not limited. It should also be understood that in the following description, terms such as "first" and "second" are used to describe various elements, but these elements should not be limited by these terms. These terms are used merely to distinguish one element from another element. For example, the first condenser lens group may be referred to as the second condenser lens group, and similarly, the second condenser lens group may be referred to as the first condenser lens group, without departing from the scope of various examples. Both the first condenser lens group and the second condenser lens group are condenser lens groups, and in some cases, may be separate and different condenser lens groups.

[0069] In this application, the term "A and / or B" means the three cases of A, B, and A and B.

[0070] The above description is merely a specific embodiment of the present application, and is not intended to limit the scope of protection of the present application. Any equivalent modifications or replacements that can be easily understood by those skilled in the art within the technical scope disclosed in this application shall be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. A projector optical engine including a first light uniformizing device (1), a red / green light providing component (2), a first dichroic mirror (3), a second light uniformizing device (4), a blue light providing component (5), a converging lens (6), and an imaging component (7), the first light homogenizing device (1) is located in an optical path between the red-green light providing component (2) and the first dichroic mirror (3); the second light homogenizing device (4) is located in the light path between the blue light providing component (5) and the first dichroic mirror (3), such that the red-green light beam provided by the red-green light providing component (2) and the blue light beam provided by the blue light providing component (5) are respectively transmitted through and reflected via the first dichroic mirror (3) and combined into one beam; the converging lens (6) is located in the optical path between the first dichroic mirror (3) and the imaging component (7); The imaging component (7) is configured to perform imaging on the light output by the converging lens (6) and output imaging light. Projector optical engine.

2. The projector optical engine further includes a first polarization conversion system (8) and a second polarization conversion system (9), the first polarization conversion system (8) is located in the optical path between the first light homogenizing device (1) and the first dichroic mirror (3); 2. The projector optical engine of claim 1, wherein the second polarization conversion system (9) is located in the optical path between the second light homogenizer (4) and the first dichroic mirror (3).

3. The projector optical engine further includes a first polarization conversion system (8), 2. The projector optical engine of claim 1, wherein the first polarization conversion system (8) is located in the light path between the first light homogenizer (1) and the first dichroic mirror (3).

4. The first light homogenizing device (1) is a compound lens, a free-form lens, or an integrator rod; The projector optical engine of claim 1, wherein the second light homogenizing device (4) is a compound lens, a freeform lens, or an integrator rod.

5. The red and green light providing component (2) includes a first condenser lens group (21), a red light source (22), a second dichroic mirror (23), a second condenser lens group (24), and a green light source (25); the first condenser lens group (21) is located in an optical path between the red light source (22) and the second dichroic mirror (23); the second condenser lens group (24) is located in the optical path between the green light source (25) and the second dichroic mirror (23); a red light beam provided by the red light source (22) and a green light beam provided by the green light source (25) are combined into the red-green light beam via the second dichroic mirror (23); 5. The projector optical engine of claim 1, wherein the red light source (22) is a Laser Diode (LD) light source or a Light Emitting Diode (LED) light source and the green light source (25) is a LD light source or a LED light source.

6. The blue light providing component (5) includes a blue light source (51) and a third collecting lens group (52); The projector optical engine of any one of claims 1 to 4, wherein the blue light source (51) is a LD light source or a LED light source.

7. The projector optical engine of any one of the preceding claims, wherein the converging lens (6) comprises an integral lens and / or a focusing lens.

8. The imaging component (7) includes a beam splitter (71), a reflective spatial light modulator (72), and a lens (73); 5. A projector optical engine according to claim 1, wherein the beam splitter (71) is located in an optical path between the converging lens (6) and the reflective spatial light modulator (72), and is located in an optical path between the reflective spatial light modulator (72) and the lens (73).

9. the beam splitter (71) is a polarizing beam splitter and the reflective spatial light modulator (72) is a liquid crystal on silicon (LCOS), or The projector optical engine of claim 8, wherein the beam splitter (71) is a beam splitter prism and the reflective spatial light modulator (72) is a digital micromirror device (DMD).

10. The projector optical engine of claim 9 , wherein the polarizing beam splitter is a metal wire grid polarizing beam splitter (WGP).

11. The imaging component (7) includes a lens (73) and a liquid crystal display (LCD) (74); 5. A projector optical engine according to any one of the preceding claims, wherein the LCD (74) is located in the optical path between the converging lens (6) and the lens (73).

12. A display device, the display device comprising: A projector optical engine according to any one of claims 1 to 11; a reflective component (01) that reflects the light beam output by the projector optical engine.

13. 13. The display device of claim 12, further comprising a diffusion screen (02) located in an optical path between the projector optical engine and the reflective component (01) and configured to diffuse imaging light output by the projector optical engine.

14. A vehicle, the vehicle comprising: A vehicle comprising a windscreen (10) and a display device according to claim 12 or 13.

Images