Projection system and display system

Abstract

The utility model provides a projection system and a display system. The projection system comprises an image generation module and a temperature management module. The image generation module is used for emitting image light. The temperature management module is disposed on an optical path of the image light and includes a substrate and a temperature management element in contact with the substrate. The temperature management module transmits the image light and reflects and / or absorbs part of the external environment light emitted to the image generation module.

Description

Technical Field

[0001] The present application relates to the field of optical technology, and more specifically, to a projection system and a display system. Background Art

[0002] With the development of projection technology, the application of head-up displays (HUDs) in the automotive field is becoming increasingly widespread. HUDs use the principle of optical reflection to project important information onto the windshield at roughly eye level. When the driver looks forward through the HUD, they can easily integrate the external scene with the information displayed by the HUD. The driver can always keep their head up. This not only prevents the driver from ignoring the rapid changes in the external environment between lowering and raising their head, reduces the delay and discomfort caused by the need to constantly adjust the eye focus, but also avoids the interruption of attention and loss of status awareness caused by lowering the head to check the instrument. In particular, the image generation unit (PGU) is the core component of the HUD. It can use different display chips according to different application scenarios to emit image light containing image information.

[0003] However, there are currently two common types of HUDs on the market. The first type has a narrow field of view, which doesn't fully integrate with the surrounding real-world scene, and thus doesn't fully demonstrate the enhanced display function. The second type has a wider field of view and higher brightness, but the temperature of the display chip surface increases with the increase in field of view, posing the risk of chip burn-in.

[0004] For example, in HUD applications with a wide field of view, when ambient light, such as sunlight, shines on the thin-film transistor display (TFT, which contains the display chip), it converges onto the TFT, causing the surface temperature of the TFT to rise and increasing the risk of screen burn-in. Furthermore, the high-energy ambient light that hits the TFT surface can be reflected into the driver's eyes, easily creating ghost images and affecting the projection quality and driving experience. Utility Model Content

[0005] In one aspect, the present application provides a projection system. The projection system includes an image generation module and a temperature management module. The image generation module is configured to emit image light. The temperature management module is disposed in the optical path of the image light and includes a substrate and a temperature management element in contact with the substrate. The temperature management module transmits the image light and reflects and / or absorbs a portion of external ambient light directed toward the image generation module.

[0006] In one embodiment, the temperature management element includes a diffractive optical element, which is disposed on a side of the substrate facing away from the image generation module and in contact with the substrate, and is configured to reflect infrared light and / or near-infrared light in the external ambient light.

[0007] In one embodiment, the temperature management element includes an infrared cutoff film layer. The infrared cutoff film layer is disposed on a side of the substrate facing away from the image generation module and is in contact with the substrate. The infrared cutoff film layer has a transmittance of less than 10% for ambient light within the wavelength range of 700 nm to 2000 nm. The infrared cutoff film layer has a transmittance of greater than 90% for ambient light within the wavelength range of 420 nm to 680 nm.

[0008] In one embodiment, the temperature management element includes a polarizing film element. The polarizing film element is disposed between the substrate and the image generation module or on a side facing away from the substrate and in contact with the substrate. The polarizing film element reflects and / or absorbs P light in the external ambient light and transmits S light in the external ambient light.

[0009] In one embodiment, a diffractive optical element includes a light-transmitting film layer and a plurality of microstructures. The light-transmitting film layer is in contact with a substrate. The plurality of microstructures are located on a side of the light-transmitting film layer facing away from the substrate and in contact with the light-transmitting film layer. The microstructure and the light-transmitting film layer form an integral structure. The microstructure is triangular, and the triangle includes a first surface and a second surface that are not in contact with the light-transmitting film layer. The microstructure satisfies: 0.6 um ≤ a ≤ 3 um, 0.176 ≤ b / c ≤ 0.7, and 1 ≤ b / (ac) ≤ 4, wherein a is the length of the microstructure in a direction parallel to the substrate, b is the height of the microstructure in a direction perpendicular to the substrate, and c is the projected size of the larger surface between the first surface and the second surface on the substrate.

[0010] In one embodiment, the projection system further includes a reflection module, which is configured to reflect the image light onto the windshield.

[0011] In one embodiment, the reflective module includes a first curved reflector and a second curved reflector. The temperature management module, the first curved reflector, and the second curved reflector are sequentially arranged along an optical path. The first curved reflector receives and reflects image light emitted from the temperature management module. The second curved reflector receives and reflects image light emitted from the first curved reflector.

[0012] In one embodiment, the temperature management module and the image generation module are arranged relative to each other at an angle. The projection system satisfies the following conditions: 0.088 ≤ L / V ≤ 0.5 or 0.707 ≤ S1 / S2 ≤ 0.985, where L is the distance between the centers of the image generation module and the temperature management module on the optical path, V is the dimension of the image generation module perpendicular to the optical path, S1 is the surface area of ​​the image generation module perpendicular to the optical path, and S2 is the surface area of ​​the temperature management module in the direction of optical transmission.

[0013] In one embodiment, the temperature management module and the image generation module are arranged in parallel with each other. The reflectivity of the temperature management module is less than 1%.

[0014] In one embodiment, the reflection module includes a first curved reflector and a second curved reflector. The first curved reflector, the temperature management module, and the second curved reflector are sequentially arranged along an optical path. The first curved reflector receives and reflects image light emitted from the image generation module. The temperature management module receives and transmits image light emitted from the first curved reflector. The second curved reflector receives and reflects image light emitted from the temperature management module.

[0015] In one embodiment, the projection system satisfies: 10°≤α≤45°, where α is the angle between a line connecting the centers of the first curved reflector and the second curved reflector and a central normal of the temperature management module.

[0016] In one embodiment, the projection system further includes a light source, a collimating lens, a diffusion film, and a reflective polarizer. The light source is configured to emit light. The collimating lens receives the light, collimates the light, and then emits it. The diffusion film receives the light emitted by the collimating lens, homogenizes the received light, and then emits it. The reflective polarizer receives the light emitted by the diffusion film, wherein the reflective polarizer reflects or absorbs S light in the received light and transmits P light in the received light. The image generation module receives the P light transmitted by the reflective polarizer and emits S light.

[0017] In one embodiment, the projection system satisfies: 0.5 mm ≤ H ≤ 15 mm, where H is the distance between the center of the diffusion film and the center of the image generation module on the optical path.

[0018] In one embodiment, the image generation module includes a display chip. The projection system satisfies: -5°≤β≤5°, where β is the angle between the polarization axis of the reflective polarizer and the polar axis of the display chip.

[0019] In one embodiment, the projection system further includes a dust cover, which is located on one side of the reflection module, wherein the image light emitted by the reflection module passes through the dust cover and is projected onto the windshield.

[0020] In one embodiment, the image generation module includes a display chip that receives the P light emitted by the reflective polarizer and converts the P light into S light for transmission.

[0021] Another aspect of the present application provides a display system. The display system includes the above-mentioned projection system and a windshield. Image light emitted by the projection system is projected onto the windshield, so that a user can observe the image displayed on the windshield.

[0022] In one or more embodiments of the present application, by setting up a temperature management module, the temperature management module can reflect or absorb part of the external ambient light directed to the image generation module, thereby helping to reduce the energy of external ambient light such as sunlight irradiating the surface of the image generation module, reduce the temperature of the surface of the image generation module, and reduce the risk of high-temperature burn-in. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0024] Figure 1 is a schematic block diagram of a projection system in an embodiment of the present application;

[0025] Figure 2 Schematic diagram of the working principle of the projection system in the embodiment of the present application;

[0026] Figure 3 This is a schematic diagram of the structure of the projection system in one embodiment of the present application.

[0027] Figure 4 This is a schematic diagram of the structure of a temperature management module in one embodiment of the present application;

[0028] Figure 5 is a schematic structural diagram of a temperature management module in another embodiment of the present application;

[0029] Figure 6 This is a schematic structural diagram of a temperature management module in another embodiment of the present application;

[0030] Figure 7 shows the structure of a diffractive optical element;

[0031] Figure 8 is a schematic structural diagram of a projection system in another embodiment of the present application;

[0032] Figure 9 and Figure 10 Schematic diagram of the relationship between the polarization axis of the reflective polarizer and the polar axis of the display chip in the image generation module in an embodiment of the present application;

[0033] Figure 11 is a partial structural diagram of a projection system in another embodiment of the present application;

[0034] Figure 12 is a light path diagram of the projection system in Example 1 of the present application;

[0035] Figure 13 is a light path diagram of the projection system in Example 2 of the present application;

[0036] Figure 14 is a light path diagram of the projection system in Example 3 of the present application;

[0037] Figure 15 is a light path diagram of the projection system in Example 4 of the present application; and

[0038] Figure 16 This is a light path diagram of the projection system in Example 5 of the present application. DETAILED DESCRIPTION

[0039] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] It should be noted that in this specification, the expressions first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, without departing from the teachings of this application, the first curved reflector discussed below can also be referred to as the second curved reflector, and vice versa.

[0041] In the accompanying drawings, the thickness, size, and shape of components have been slightly adjusted for ease of illustration. The accompanying drawings are for illustration only and are not drawn strictly to scale. As used herein, the terms "substantially," "approximately," and similar terms are used to indicate approximations, not degrees, and are intended to account for the inherent variations in measurements or calculations that would be recognized by one of ordinary skill in the art.

[0042] It should also be understood that expressions such as "comprises," "including," "having," "includes," and / or "comprising" are open rather than closed expressions in this specification, indicating the presence of the stated features, elements, and / or components, but do not exclude the presence of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than just the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0043] Unless otherwise defined, all terms used herein (including engineering and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that, unless otherwise specified in this application, words defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or overly formal sense.

[0044] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] The features, principles and other aspects of the present application are described in detail below.

[0046] Figure 1 It is a schematic block diagram of the projection system 1000 in an embodiment of the present application.

[0047] Projection system 1000 may include an image generation module 1100 and a temperature management module 1200. Image generation module 1100 may be configured to emit image light 100. Temperature management module 1200 may be disposed on the optical path of image light 100. Temperature management module 1200 may include a substrate 1210 and a temperature management element 1220 in contact with substrate 1210. Temperature management module 1200 may transmit image light 100 and reflect and / or absorb a portion of external ambient light 200 directed toward image generation module 1100.

[0048] Figure 2 FIG. 1 is a schematic diagram of the working principle of the projection system 1000 in the embodiment of the present application. Figure 2As shown, projection system 1000 can be used in a HUD device. Projection system 1000 can project a virtual image containing image information into the driver's field of view. For example, it can reflect a light beam containing image information onto the vehicle's windshield 330 to present a virtual image 310 containing image information in front of windshield 330, allowing the driver's eyes 320 to conveniently view the image information. For example, projection system 1000 can project vehicle instrument information and navigation information into the driver's field of view, allowing the driver to see the instrument information and navigation information in front of their field of view without having to look down at the instrument panel or central control display below the steering wheel.

[0049] However, due to the reversibility of the optical path, external ambient light, such as sunlight, can also enter the projection system 1000 through the windshield, making it prone to sunlight backflow. Based on this, the present application provides a temperature management module 1200 in the optical path of the image light 100, which can cause the temperature management module 1200 to reflect or absorb a portion of the external ambient light 200 directed toward the image generation module 1100. This can help reduce the energy of the external ambient light 200 that irradiates the surface of the image generation module 1100, lowering the surface temperature of the image generation module 1100 and minimizing the risk of high-temperature screen burn-in.

[0050] Figure 3 FIG is a schematic diagram of the structure of a projection system 1000 in one embodiment of the present application. Figure 3 As shown, the projection system 1000 may further include a light source 1300 , a collimating lens 1400 , a diffusion film 1500 , a reflective polarizer 1600 , a reflective module 1700 , and a dust cover 1800 .

[0051] Light source 1300 can be used to emit light. A collimating lens 1400, a diffusion film 1500, and a reflective polarizer 1600 can be arranged sequentially along the path of light emitted by light source 1300. Collimating lens 1400 can receive light emitted by light source 1300, collimate and homogenize the received light, and then emit it. Diffusion film 1500 can receive light emitted by collimating lens 1400, homogenize the received light, and then emit it. Reflective polarizer 1600 can receive light emitted by diffusion film 1500. Reflective polarizer 1600 can reflect or absorb S light in the received light and transmit P light in the received light.

[0052] For example, light source 1300 can generate and emit a laser beam. The light emitted by light source 1300 can include S light and P light. Light source 1300 can include red, green, and blue laser light sources or red, green, and blue LED light sources, so that projection system 1000 can project a light beam containing color image information. A collimating lens 1400 can be located on one side of light source 1300 and can be used to collimate the diverging light beam emitted by light source 1300 to form a parallel, collimated light beam. A diffusion film 1500 can be located on one side of collimating lens 1400 and can transmit the light emitted by collimating lens 1400, thereby diverging and homogenizing the light beam. A reflective polarizer 1600 can be used to reflect S light and transmit P light. Reflective polarizer 1600 can include, but is not limited to, a polarizing beam splitter prism or a polarizing beam splitter. The polarizing beam splitter prism can be a conventionally coated polarizing beam splitter prism or a metal grid polarizing beam splitter prism.

[0053] For example, Figure 1 and Figure 3 As shown, the image generation module 1100 can receive the P light transmitted by the reflective polarizer 1600 and emit image light 100 (image light 100 can be S light). Image light 100 can contain image information. The temperature management module 1200, the reflection module 1700, and the dust cover 1800 can be sequentially arranged along the path of the image light 100. The reflection module 1700 can be used to reflect the image light 100 onto the windshield 330. The dust cover 1800 can be located on one side of the reflection module 1700, with the image light 100 emitted by the reflection module 1700 passing through the dust cover 1800 and projected onto the windshield 330.

[0054] Illustratively, the image generation module 1100 may include a display chip (comprising multiple pixel units) for generating images. Illustratively, the image generation module 1100 may also include a display screen (e.g., a thin-film transistor display screen) mounted on the display chip. The display chip may receive P light emitted by the reflective polarizer 1600 and convert the received P light into S light for transmission. For example, after receiving the P light emitted by the reflective polarizer 1600, the display chip may convert the received P light into S light through the deflection of liquid crystal molecules and transmit the light. The display screen may then receive and transmit the S light emitted by the display chip.

[0055] Figure 4 FIG is a schematic diagram of the structure of the temperature management module 1200 in one embodiment of the present application. Figure 4As shown, the temperature management module 1200 may include a substrate 1210 and a temperature management element 1220, wherein the temperature management element 1220 may include a polarizing film element 1221. The polarizing film element 1221 may be disposed between the substrate 1210 and the image generation module 1100 or on a side facing away from the substrate 1210 and in contact with the substrate 1210. The polarizing film element 1221 may reflect and / or absorb P light in the external ambient light 200 and transmit S light in the external ambient light 200.

[0056] Substrate 1210 may comprise transparent plastic or glass and may have a flat plate structure. Polarizing film element 1221 may be configured to reflect P light and transmit S light. Polarizing film element 1221 may include, but is not limited to, a polarizing beam splitter prism or a polarizing beam splitter plate. The polarizing beam splitter prism may be a conventionally coated polarizing beam splitter prism or a metal grid polarizing beam splitter prism.

[0057] When external ambient light, such as sunlight, passes through the windshield and enters temperature management module 1200 (e.g., polarizing film element 1221), polarizing film element 1221 filters out polarized light from the ambient light. This, in turn, helps reduce the energy of ambient light 200 that reaches the surface of image generation module 1100 (e.g., display chip), lowering the surface temperature of image generation module 1100 (e.g., display screen), and minimizing the risk of high-temperature screen burn-in. By providing polarizing film element 1221, the present application can filter out approximately half of the polarized light from the ambient light, reducing the energy reaching the chip surface, lowering the chip surface temperature, and preventing screen burn-in.

[0058] Furthermore, in the present application, image generation module 1100 (e.g., a display chip) can emit S light, and polarizing film element 1221 can filter P light and transmit S light. Therefore, polarizing film element 1221 (e.g., temperature management element 1220) can transmit image light emitted by image generation module 1100 and filter out P light from ambient light entering image generation module 1100, preventing it from reaching the chip surface.

[0059] Figure 5 FIG. 1 is a schematic diagram of the structure of the temperature management module 1200 in another embodiment of the present application. Figure 5 As shown, the temperature management module 1200 may include a substrate 1210 and a temperature management element 1220, wherein the temperature management element 1220 may include a diffractive optical element 1222. The diffractive optical element 1222 may be disposed on a side of the substrate 1210 facing away from the image generation module 1100 and in contact with the substrate 1210. The diffractive optical element 1222 may be configured to reflect infrared light and / or near-infrared light in the external ambient light 200. The diffractive optical element 1222 may include a diffraction grating structure.

[0060] When external ambient light, such as sunlight, passes through the windshield and enters temperature management module 1200 (e.g., diffractive optical element 1222), infrared and / or near-infrared light within the external ambient light 200 can be reflected and deflected by the surface of diffractive optical element 1222, thereby preventing the infrared and / or near-infrared light from reaching the surface of image generation module 1100 (e.g., the display chip). This application utilizes the diffraction angle of the diffraction grating structure to control the angle of reflected infrared and / or near-infrared light, thereby further minimizing the risk of stray light caused by reflected light.

[0061] For example, Figure 5 As shown, the temperature management element 1220 may include a substrate 1210 and the temperature management element 1220, wherein the temperature management element 1220 may include an infrared cutoff film layer 1223. The infrared cutoff film layer 1223 may be disposed on a side of the substrate 1210 facing away from the image generation module 1100 and in contact with the substrate 1210. In other words, the temperature management element 1220 may include a diffractive optical element 1222 or an infrared cutoff film layer 1223 located on a side of the substrate 1210 facing away from the image generation module 1100 and in contact with the substrate 1210. Both the diffractive optical element 1222 and the infrared cutoff film layer 1223 may reflect infrared light and / or near-infrared light in the external ambient light 200.

[0062] For example, the infrared cutoff film layer 1223 may have a transmittance of less than 10% for light within the wavelength range of 700 nm to 2000 nm within the external ambient light. The infrared cutoff film layer 1223 may have a transmittance of greater than 90% for light within the wavelength range of 420 nm to 680 nm within the external ambient light. By providing the infrared cutoff film layer 1223, the present application can filter out infrared and / or near-infrared light from the external ambient light 200, thereby filtering out most of the heat in the light beam that strikes the image generation module 1100 (e.g., the display chip).

[0063] Figure 6This is a schematic diagram of the structure of a temperature management module 1200 in another embodiment of the present application. Temperature management module 1200 may include a substrate 1210 and a temperature management element 1220, wherein temperature management element 1220 may include a polarizing film element 1221 and a diffractive optical element 1222 (or an infrared-cutting film layer 1223). Polarizing film element 1221 may be disposed between substrate 1210 and image generation module 1100 and in contact with substrate 1210. Diffractive optical element 1222 (or an infrared-cutting film layer 1223) may be disposed on a side of substrate 1210 facing away from image generation module 1100 and in contact with substrate 1210. By including polarizing film element 1221 and diffractive optical element 1222 in the present application, temperature management element 1220 can filter out infrared light, infrared light, and / or near-infrared light from ambient light, thereby reducing the surface temperature of image generation module 1100 (e.g., display screen) and mitigating the risk of high-temperature screen burn-in.

[0064] Figure 7 The structure of the diffractive optical element 1222 is shown. For example, Figure 7 As shown, the diffractive optical element 1222 may include a light-transmitting film layer 1222-1 and a microstructure 1222-2, wherein the light-transmitting film layer 1222-1 and the microstructure 1222-2 may be an integral structure. In other words, the microstructure 1222-2 may be a protrusion on the surface of the light-transmitting film layer 1222-1. The light-transmitting film layer 1222-1 may be in contact with the substrate 1210. The microstructure 1222-2 may be located on the side of the light-transmitting film layer 1222-1 facing away from the substrate 1210 and in contact with the light-transmitting film layer 1222-1. The microstructure 1222-2 may be a diffraction grating structure and may be triangular. Each triangle may include a first surface 410 and a second surface 420 that are not in contact with the light-transmitting film layer 1222-1. As shown in FIG. Figure 7As shown, microstructure 1222-2 can satisfy the following conditions: 0.6 μm ≤ a ≤ 3 μm, 0.176 ≤ b / c ≤ 0.7, and 1 ≤ b / (ac) ≤ 4, where a is the length of microstructure 1222-2 in a direction parallel to substrate 1210, b is the height of microstructure 1222-2 in a direction perpendicular to substrate 1210, and c is the projected size of the longer surface (e.g., first surface 410) between first surface 410 and second surface 420 on substrate 1210. By properly configuring the structure of diffractive optical element 1222, the present application can achieve that when external ambient light is projected, infrared light can be reflected and deflected on the surface of diffractive optical element 1222, thereby preventing infrared light from irradiating the chip surface. In addition, in the present application, the reflected infrared light can be controlled within a reasonable range by controlling the angle of the diffraction optical element 1222, so as to adapt to the light-absorbing element in the projection system and facilitate assembly, thereby preventing the reflected infrared light from being reflected by other components (such as the side walls of the projection system, etc.) and then entering the chip again to increase the chip temperature, and preventing the reflected infrared light from being reflected into the driver's eyes and causing ghost images.

[0065] For example, Figure 3 As shown, the reflection module 1700 may include a first curved reflector 1710 and a second curved reflector 1720. The temperature management module 1200, the first curved reflector 1710, and the second curved reflector 1720 may be sequentially arranged along the optical path of the image light 100. The first curved reflector 1710 may receive and reflect the image light 100 emitted from the temperature management module 1200. The second curved reflector 1720 may receive and reflect the image light 100 emitted from the first curved reflector 1710. For example, the size of the first curved reflector 1710 may be smaller than that of the second curved reflector 1720. In other words, the first curved reflector 1710 may be a small curved reflector, and the second curved reflector 1720 may be a large curved reflector.

[0066] For example, Figure 3 As shown, the temperature management module 1200 and the image generation module 1100 may be arranged at an angle relative to each other. For example, the lower end of the temperature management module 1200 may be close to the image generation module 1100, and the upper end may be away from the image generation module 1100.

[0067] It should be noted that Figure 3 The tilt direction of the temperature management module 1200 shown in FIG. 1 is only an example and is not a specific limitation. The tilt direction of the temperature management module 1200 can be reasonably set according to actual conditions.

[0068] Figure 8 FIG. 1 is a schematic diagram of the structure of a projection system 1000 in another embodiment of the present application. Figure 8As shown, the temperature management module 1200 and the image generation module 1100 may be arranged at an angle relative to each other. For example, the lower end of the temperature management module 1200 may be away from the image generation module 1100, and the upper end may be close to the image generation module 1100.

[0069] Of course, in another embodiment of the present application, the temperature management module 1200 and the image generation module 1100 may also be arranged relatively parallel, wherein the temperature management module 1200 may have a low reflectivity characteristic, for example, the reflectivity of the temperature management module 1200 may be less than 1%, preferably less than or equal to 0.5%. By properly positioning the temperature management module 1200, the present application facilitates the implementation of the burn-in prevention function while reducing the diameter of the temperature management module 1200 and reducing costs.

[0070] For example, Figure 3 or Figure 8 As shown, the projection system 1000 may satisfy: 0.088≤L / V≤0.5 or 0.707≤S1 / S2≤0.985, wherein L is the distance between the centers of the image generating module 1100 and the temperature management module 1200 on the optical path, V is the size of the image generating module 1100 in a direction perpendicular to the optical path, S1 is the surface area of ​​the image generating module 1100 in a direction perpendicular to the optical path, and S2 is the surface area of ​​the temperature management module 1200 in the direction of optical path transmission.

[0071] This application, by rationally positioning the temperature management module 1200, helps prevent screen burn-in while reducing the aperture of the temperature management module 1200, lowering costs and minimizing ghost images. For example, if the projection system 1000 satisfies 2L / V < 0.176 or S1 / S2 > 0.985, the system light will return to the human eye after passing through the temperature management module 1200, posing a risk of ghost images and affecting image contrast. If the projection system 1000 satisfies 2L / V > 1 or S1 / S2 < 0.707, the aperture of the temperature management module 1200 will be too large, the system volume will be too large, and costs will increase.

[0072] For example, Figure 3 or Figure 8As shown, projection system 1000 can satisfy the following conditions: 0.5 mm ≤ H ≤ 15 mm, where H is the distance between the centers of the diffuser film 1500 and the image generation module 1100 along the optical path. By setting H within a reasonable range, the present application not only reduces the risk of interference between components near the diffuser film 1500, but also reduces the temperature near the diffuser film 1500, thereby improving the reliability of projection system 1000. For example, if H is less than 0.5 mm, the distance between the diffuser film 1500 and the image generation module 1100 can be reduced, thereby increasing the risk of interference between components between the diffuser film 1500 and the image generation module 1100. If H is greater than 15 mm, the distance between the diffuser film 1500 and the collimating lens 1400 can be reduced. However, if the light source 1300 and the collimating lens 1400 are closely arranged, a small distance between the diffuser film 1500 and the collimating lens 1400 may result in higher temperatures near the diffuser film 1500, thus affecting reliability.

[0073] Figure 9 and Figure 10 Schematic diagram of the relationship between the polarization axis of the reflective polarizer 1600 and the polar axis of the display chip 1110 in the image generation module 1100 in the embodiment of the present application. For example, the projection system 1000 satisfies: -5°≤β≤5°, where β is the angle between the polarization axis of the reflective polarizer 1600 and the polar axis of the display chip 1110. For example, Figure 9 As shown, the angle β between the polarization axis of the reflective polarizer 1600 and the polarization axis of the display chip 1110 is 0°. Figure 10 As shown, the angle β between the polarization axis of the reflective polarizer 1600 and the polarization axis of the display chip 1110 is in the range of 0° to 5° (or -5° to 0°).

[0074] In the present application, the sources of surface heat of the image generation module 1100 are mainly the irradiation of the light source 1300 and the irradiation of the external ambient light. The display chip 1110 in the image generation module 1100 can transmit P light and convert P light into S light. Therefore, the present application sets a reflective polarizer 1600 that can transmit P light and reflect S light, so that the P light in the light source 1300 is transmitted to the display chip 1110 and is converted into S light by the display chip 1110 and then emitted. The reflective polarizer 1600 reflects S light and can filter out the S light in the light source 1300, avoid the superposition of the light source energy and the external ambient light energy, reduce the chip surface temperature, and prevent screen burn-in. In addition, by setting -5°≤β≤5°, the present application can better adapt to the polarization effect, improve the filtering efficiency of the reflective polarizer 1600, and reduce the chip surface temperature.

[0075] Figure 11 FIG. 1 is a partial structural diagram of a projection system 1000 in another embodiment of the present application. Figure 11As shown, the first curved reflector 1710, the temperature management module 1200, and the second curved reflector 1720 can be sequentially arranged along the optical path of the image light 100. In other words, the temperature management module 1200 can be located between the first curved reflector 1710 and the second curved reflector 1720. The first curved reflector 1710 can receive and reflect the image light 100 emitted from the image generation module 1100. The temperature management module 1200 can receive and transmit the image light 100 emitted from the first curved reflector 1710. The second curved reflector 1720 can receive and reflect the image light 100 emitted from the temperature management module 1200. For example, the projection system 1000 can satisfy the following condition: 10° ≤ α ≤ 45°, where α is the angle between the line connecting the centers of the first curved reflector 1710 and the second curved reflector 1720 and the normal to the center of the temperature management module 1200. By positioning the temperature management module 1200 between the first curved reflector 1710 and the second curved reflector 1720 and satisfying the angle of 10° ≤ α ≤ 45°, the present application not only prevents screen burn-in while reducing the temperature of other components within the projection system, but also helps to directly reflect infrared and P light from the external ambient light filtered by the temperature management module 1200 out of the projection system, thereby reducing the temperature within the cavity. For example, if α is less than 10°, the light path is reflected vertically, and the reflected light can enter the human eye, creating the risk of ghost images. If α is greater than 45°, the aperture of at least one of the temperature management module 1200, the first curved reflector 1710, and the second curved reflector 1720 is too large, resulting in high costs. There is also the risk of interference between the temperature management module 1200 and the reflective curved mirrors (such as the first curved reflector 1710 and / or the second curved reflector 1720).

[0076] Specific embodiments of the projection system applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0077] Figure 12 This is the optical path diagram of the projection system in Example 1 of the present application. Figure 12 As shown, the projection system may include a light source 1300, a collimating lens 1400, a diffusion film 1500, a reflective polarizer 1600, an image generation module 1100 (including a display chip and a display screen, not shown), a temperature management module 1200, a reflection module 1700 (including a first curved reflector 1710 and a second curved reflector 1720) and a dust cover 1800, which are arranged in sequence along the optical path.

[0078] In this embodiment, reference may be made to Figure 3 The temperature management module 1200 and the image generation module 1100 may be arranged to be tilted relative to each other. For example, the lower end of the temperature management module 1200 may be close to the image generation module 1100, and the upper end may be away from the image generation module 1100.

[0079] In this embodiment, reference may be made to Figure 7 The temperature management module 1200 may include a substrate 1210, a polarizing film element 1221, and a diffractive optical element 1222. The polarizing film element 1221 may be disposed between the substrate 1210 and the image generating module 1100 and in contact with the substrate 1210. The diffractive optical element 1222 may be disposed on a side of the substrate 1210 facing away from the image generating module 1100 and in contact with the substrate 1210.

[0080] In this embodiment, light emitted by the light source 1300 passes through the collimating lens 1400, the diffusion film 1500, the reflective polarizer 1600, the image generation module 1100, the temperature management module 1200, the first curved reflector 1710, the second curved reflector 1720, the dust cover 1800 and the windshield 330 to the driver's eyes 320.

[0081] The collimating lens 1400 collimates and homogenizes the light. The diffuser 1500 performs secondary homogenization of the light. The reflective polarizer 1600 filters (e.g., reflects) the S light and transmits the P light. The image generation module 1100 transmits the P light and emits the S light (e.g., image light containing image information). The temperature management module 1200 reflects external ambient light, such as infrared light and P light in sunlight, and transmits the S light. The first curved reflector 1710 and the second curved reflector 1720 reflect light. The dust cover 1800 transmits light.

[0082] In this embodiment, by providing a reflective polarizer 1600 to filter (e.g., reflect) S light, it is helpful to reduce unnecessary light from irradiating the surface of the image generation module 1100, avoid the superposition of light source energy and external ambient light energy, reduce the chip surface temperature, and prevent screen burn-in. The temperature management module 1200 can filter infrared light and P light from the external ambient light and transmit S light, which is helpful to reduce the energy of external ambient light irradiating the chip surface, reduce the chip surface temperature, and prevent screen burn-in. For example, the diffractive optical element 1222 in the temperature management module 1200 can filter infrared light and control the microstructure 1222-2 ( Figure 7 ) is so large that it diffracts in the infrared band, reflecting the infrared light and preventing it from passing through.

[0083] The image light emitted by the image generation module 1100 can pass through the temperature management module 1200 and be reflected on the surface of the first curved reflector 1710 to the second curved reflector 1720, then be reflected on the surface of the second curved reflector 1720 to the dust cover 1800 and pass through the dust cover 1800 to the windshield 330, and finally reflect the image light through the windshield to the driver's eyes 320.

[0084] In this embodiment, the surface heat of image generation module 1100 primarily originates from illumination by light source 1300 and external ambient light, such as sunlight. The display chip in image generation module 1100 transmits P light and converts it into S light. Therefore, a reflective polarizer 1600 is provided to transmit P light and reflect S light. This allows P light from light source 1300 to be transmitted to display chip 1110, where it is converted into S light before being emitted. The S light emitted by image generation module 1100 can be transmitted by temperature management module 1200.

[0085] In this embodiment, the temperature management module 1200 may be located between the image generation module 1100 and the first curved reflector 1710. Figure 3 or Figure 8 , the projection system 1000 can satisfy 0.088≤L / V≤0.5 and 0.707≤S1 / S2≤0.985, where L is the distance between the centers of the image generation module 1100 and the temperature management module 1200 on the optical path, V is the size of the image generation module 1100 in the direction perpendicular to the optical path, S1 is the surface area of ​​the image generation module 1100 in the direction perpendicular to the optical path, and S2 is the surface area of ​​the temperature management module 1200 in the direction perpendicular to the optical path. Figure 7 The diffractive optical element 1222 can satisfy 0.7 um≤a≤3 um, 0.176≤b / c≤0.7, and 1≤b / (ac)≤4, wherein a is the length of the microstructure in a direction parallel to the substrate, b is the height of the microstructure in a direction perpendicular to the substrate, and c is the projection size of the larger surface between the first surface and the second surface on the substrate.

[0086] Figure 13 This is the optical path diagram of the projection system in Example 2 of the present application. Figure 13 As shown, the projection system may include a light source 1300, a collimating lens 1400, a diffusion film 1500, a reflective polarizer 1600, an image generation module 1100 (including a display chip and a display screen, not shown), a first curved reflector 1710, a temperature management module 1200, a second curved reflector 1720 and a dust cover 1800, which are arranged in sequence along the optical path.

[0087] In this embodiment, light emitted by the light source 1300 passes through the collimating lens 1400, the diffusion film 1500, the reflective polarizer 1600, the image generation module 1100, the first curved reflector 1710, the temperature management module 1200, the second curved reflector 1720, the dust cover 1800 and the windshield 330 to the driver's eyes 320.

[0088] The collimating lens 1400 collimates and homogenizes the light. The diffuser 1500 performs secondary homogenization of the light. The reflective polarizer 1600 filters (e.g., reflects) the S light and transmits the P light. The image generation module 1100 transmits the P light and emits the S light (e.g., image light containing image information). The temperature management module 1200 reflects infrared light and the P light from the external ambient light and transmits the S light. The first curved reflector 1710 and the second curved reflector 1720 reflect light. The dust cover 1800 transmits light.

[0089] In this embodiment, reflective polarizer 1600 is provided to filter (e.g., reflect) S light, thereby reducing the amount of unneeded light that reaches the surface of image generation module 1100, preventing the energy of the light source from overlapping with the energy of external ambient light, lowering the chip surface temperature, and preventing screen burn-in. Temperature management module 1200 filters external ambient light, such as infrared and P light in sunlight, while transmitting S light. This helps reduce the amount of external ambient light that reaches the chip surface, lowering the chip surface temperature and preventing screen burn-in.

[0090] The image light emitted by the image generation module 1100 can be reflected from the surface of the first curved reflector 1710 to the temperature management module 1200 and pass through the temperature management module 1200 to the second curved reflector 1720, then reflected from the surface of the second curved reflector 1720 to the dust cover 1800 and pass through the dust cover 1800 to the windshield 330, and finally the image light is reflected from the windshield to the driver's eyes 320.

[0091] In this embodiment, the surface heat of image generation module 1100 primarily originates from illumination by light source 1300 and external ambient light, such as sunlight. The display chip in image generation module 1100 transmits P light and converts it into S light. Therefore, a reflective polarizer 1600 is provided in this application to transmit P light and reflect S light. This allows P light from light source 1300 to be transmitted to display chip 1110, where it is converted into S light before being emitted. The S light emitted by image generation module 1100 is reflected by first curved reflector 1710 and then transmitted by temperature management module 1200.

[0092] In this embodiment, reference may be made to Figure 11The temperature management module 1200 can be located between the first curved reflector 1710 and the second curved reflector 1720. The projection system 1000 can satisfy the condition 10°≤α≤45°, where α is the angle between the line connecting the centers of the first curved reflector 1710 and the second curved reflector 1720 and the normal to the center of the temperature management module 1200. In this embodiment, by locating the temperature management module 1200 between the first curved reflector 1710 and the second curved reflector 1720 and satisfying the condition 10°≤α≤45°, this not only helps prevent screen burn-in while reducing the temperature of other components within the projection system, but also helps directly reflect infrared light and P light from the external ambient light filtered by the temperature management module 1200 out of the projection system, thereby reducing the temperature within the cavity.

[0093] Figure 14 3 is a light path diagram of the projection system in Example 3 of the present application. In this embodiment, for the sake of brevity, some descriptions similar to those in Example 1 will be omitted.

[0094] like Figure 14 As shown, the projection system may include a light source 1300, a collimating lens 1400, a diffusion film 1500, a reflective polarizer 1600, an image generation module 1100 (including a display chip and a display screen, not shown), a temperature management module 1200, a reflection module 1700 (including a first curved reflector 1710 and a second curved reflector 1720) and a dust cover 1800, which are arranged in sequence along the optical path.

[0095] In this embodiment, light emitted by the light source 1300 passes through the collimating lens 1400, the diffusion film 1500, the reflective polarizer 1600, the image generation module 1100, the temperature management module 1200, the first curved reflector 1710, the second curved reflector 1720, the dust cover 1800 and the windshield 330 to the driver's eyes 320.

[0096] In this embodiment, reference may be made to Figure 8 The temperature management module 1200 and the image generation module 1100 may be arranged at an angle relative to each other. For example, the lower end of the temperature management module 1200 may be away from the image generation module 1100, and the upper end may be closer to the image generation module 1100.

[0097] In this embodiment, reference may be made to Figure 6The temperature management module 1200 may include a substrate 1210, a polarizing film element 1221, and an infrared cutoff film layer 1223. The polarizing film element 1221 may be disposed between the substrate 1210 and the image generation module 1100 and in contact with the substrate 1210. The infrared cutoff film layer 1223 may be disposed on a side of the substrate 1210 facing away from the image generation module 1100 and in contact with the substrate 1210. The infrared cutoff film layer 1223 may have a transmittance of less than 10% for light within the wavelength range of 700 nm to 2000 nm within the external ambient light. The infrared cutoff film layer 1223 may have a transmittance of greater than 90% for light within the wavelength range of 420 nm to 680 nm within the external ambient light. By providing the infrared cutoff film layer 1223, the present application can filter out infrared and / or near-infrared light from the external ambient light 200, thereby filtering out most of the heat in the light beam that strikes the image generation module 1100 (e.g., the display chip).

[0098] Figure 15 4 is a light path diagram of the projection system in Example 4 of the present application. In this embodiment, for the sake of brevity, some descriptions similar to those in Example 2 will be omitted.

[0099] like Figure 15 As shown, the projection system may include a light source 1300, a collimating lens 1400, a diffusion film 1500, a reflective polarizer 1600, an image generation module 1100 (including a display chip and a display screen, not shown), a first curved reflector 1710, a temperature management module 1200, a second curved reflector 1720 and a dust cover 1800, which are arranged in sequence along the optical path.

[0100] In this embodiment, reference may be made to Figure 6 The temperature management module 1200 may include a substrate 1210, a polarizing film element 1221, and an infrared cutoff film layer 1223. The polarizing film element 1221 may be disposed between the substrate 1210 and the image generation module 1100 and in contact with the substrate 1210. The infrared cutoff film layer 1223 may be disposed on a side of the substrate 1210 facing away from the image generation module 1100 and in contact with the substrate 1210. The infrared cutoff film layer 1223 may have a transmittance of less than 10% for light within the wavelength range of 700 nm to 2000 nm within the external ambient light. The infrared cutoff film layer 1223 may have a transmittance of greater than 90% for light within the wavelength range of 420 nm to 680 nm within the external ambient light. By providing the infrared cutoff film layer 1223, the present application can filter out infrared and / or near-infrared light from the external ambient light 200, thereby filtering out most of the heat in the light beam that strikes the image generation module 1100 (e.g., the display chip).

[0101] Figure 16: is a light path diagram of the projection system in Example 5 of the present application. In this embodiment, for the sake of brevity, some descriptions similar to those in Example 1 will be omitted.

[0102] like Figure 16 As shown, the projection system may include a light source 1300, a collimating lens 1400, a diffusion film 1500, a reflective polarizer 1600, an image generation module 1100 (including a display chip and a display screen, not shown), a temperature management module 1200, a reflection module 1700 (including a first curved reflector 1710 and a second curved reflector 1720) and a dust cover 1800, which are arranged in sequence along the optical path.

[0103] In this embodiment, the temperature management module 1200 and the image generation module 1100 may be arranged relatively parallel. The temperature management module 1200 may have a low reflectivity characteristic. In other words, the reflectivity of the temperature management module 1200 may be relatively low. For example, the reflectivity of the temperature management module 1200 may be less than 1%. By arranging the temperature management module 1200 and the image generation module 1100 relatively parallel, this application facilitates preventing screen burn-in while reducing the size of the temperature management module 1200 and lowering costs.

[0104] Another aspect of the present application provides a display system. Figure 2 The display system includes the projection system 1000 and a windshield 330. The image light 100 emitted by the projection system 1000 can be projected onto the windshield 300, so that a user such as a driver can observe the image displayed on the windshield 330.

[0105] For example, the projection system 1000 can project a virtual image containing image information in front of the driver's field of view. For example, the projection system 1000 can reflect a light beam containing image information toward the vehicle's windshield 330 to present a virtual image 310 containing image information in front of the windshield 330, allowing the driver's eyes 320 to conveniently view the image information. In this way, the driver can observe the virtual image 310 formed in front of their field of view, thereby realizing a head-up display function.

[0106] The above description is merely an implementation method of this application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of protection provided by this application is not limited to technical solutions formed by a specific combination of the aforementioned technical features, but also encompasses other technical solutions formed by any combination of the aforementioned technical features or their equivalents, without departing from the technical concept. For example, a technical solution formed by replacing the aforementioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A projection system, characterized in that: include: An image generating module, configured to emit image light; as well as a temperature management module, disposed on the optical path of the image light, and comprising a substrate and a temperature management element in contact with the substrate; The temperature management module transmits the image light and reflects and / or absorbs a portion of the external ambient light directed toward the image generation module.

2. The projection system according to claim 1, wherein: The temperature management element comprises: A diffractive optical element is provided on a side of the substrate facing away from the image generating module and in contact with the substrate, and is used for reflecting infrared light and / or near-infrared light in the external ambient light.

3. The projection system according to claim 1, wherein: The temperature management element includes: an infrared cutoff film layer, disposed on a side of the substrate facing away from the image generation module and in contact with the substrate, wherein the transmittance of the infrared cutoff film layer to light within a wavelength range of 700 nm to 2000 nm in the external ambient light is less than 10%; and The transmittance of the infrared cutoff film layer to light within a wavelength range of 420 nm to 680 nm in the external ambient light is greater than 90%.

4. The projection system according to any one of claims 1 to 3, characterized in that The temperature management element includes: A polarizing film element is arranged between the substrate and the image generating module or on a side away from the substrate and in contact with the substrate, wherein the polarizing film element reflects and / or absorbs P light in the external ambient light and transmits S light in the external ambient light.

5. The projection system according to claim 2, wherein: The diffractive optical element comprises: a light-transmitting film layer in contact with the substrate; and a plurality of microstructures located on a side of the light-transmitting film layer facing away from the substrate and in contact with the light-transmitting film layer, wherein the microstructures and the light-transmitting film layer are integrally formed, and the microstructures are triangular in shape, and the triangle includes a first surface and a second surface that are not in contact with the light-transmitting film layer; The microstructure satisfies the following conditions: 0.6 um≤a≤3 um, 0.176≤b / c≤0.7, and 1≤b / (ac)≤4, wherein a is the length of the microstructure in a direction parallel to the substrate, b is the height of the microstructure in a direction perpendicular to the substrate, and c is the projection size of the larger surface between the first surface and the second surface on the substrate.

6. The projection system according to claim 4, wherein: The projection system further comprises: The reflection module is used to reflect the image light onto the windshield.

7. The projection system according to claim 6, wherein: The reflection module includes a first curved reflector and a second curved reflector. Wherein, the temperature management module, the first curved reflector and the second curved reflector are arranged in sequence along the optical path; a first curved reflector, receiving and reflecting the image light emitted from the temperature management module; and The second curved reflector receives and reflects the image light emitted from the first curved reflector.

8. The projection system according to claim 7, wherein: The temperature management module and the image generation module are arranged to be tilted relative to each other; The projection system satisfies: 0.088≤L / V≤0.5 or 0.707≤S1 / S2≤0.985, where L is the distance between the centers of the image generation module and the temperature management module on the optical path, V is the size of the image generation module in a direction perpendicular to the optical path, S1 is the surface area of ​​the image generation module in a direction perpendicular to the optical path, and S2 is the surface area of ​​the temperature management module in the direction of transmission of the optical path.

9. The projection system according to claim 6, wherein: The temperature management module and the image generation module are arranged relatively parallel to each other, wherein the reflectivity of the temperature management module is less than 1%.

10. The projection system according to claim 6, wherein: The reflection module includes a first curved reflector and a second curved reflector. Wherein, the first curved reflector, the temperature management module and the second curved reflector are arranged in sequence along the optical path; The first curved reflector receives and reflects the image light emitted from the image generating module; The temperature management module receives and transmits the image light emitted from the first curved reflector; and The second curved reflector receives and reflects the image light emitted from the temperature management module.

11. The projection system according to claim 10, wherein: The projection system satisfies the following: 10°≤α≤45°, where α is the angle between a line connecting the centers of the first curved reflector and the second curved reflector and a center normal of the temperature management module.

12. The projection system according to claim 4, wherein: The projection system further comprises: a light source for emitting light; a collimating lens, receiving the light, and emitting the light after collimation; a diffusion film, receiving the light emitted by the collimating lens, homogenizing the received light and then emitting it; and a reflective polarizer, receiving the light emitted by the diffusion film, wherein the reflective polarizer reflects or absorbs S light in the received light and transmits P light in the received light; The image generation module receives the P light transmitted by the reflective polarizer and emits the S light.

13. The projection system according to claim 12, wherein: The projection system satisfies: 0.5 mm ≤ H ≤ 15 mm, where H is the distance between the center of the diffusion film and the center of the image generation module on the optical path.

14. The projection system according to claim 12, wherein: The image generation module includes a display chip, The projection system satisfies: -5°≤β≤5°, where β is the angle between the polarization axis of the reflective polarizer and the polar axis of the display chip.

15. The projection system according to claim 6, wherein: The projection system further comprises: A dust cover is located on one side of the reflection module, wherein the image light emitted by the reflection module passes through the dust cover and is projected onto the windshield.

16. The projection system according to claim 12, wherein: The image generation module includes: The display chip receives the P light emitted by the reflective polarizer and converts the P light into S light for transmission.

17. A display system, characterized in that: include: The projection system according to any one of claims 1 to 16; as well as A windshield, wherein the image light emitted by the projection system is projected onto the windshield, so that a user observes the image presented on the windshield.

Images