Projection device, projection lens assembly, and projection system

Abstract

This application relates to the technical field of projection equipment, and discloses a projection device, a projection lens assembly and a projection system. The projection device includes a display device, the display device has a curved display surface, the curvature of the display surface matches the curvature of the projection surface of the projection screen, the projection device further includes a projection lens assembly, the light incident surface of the projection lens assembly is a flat surface and / or an arcuate surface protruding toward the display surface, and the light beam output from the display surface enters the projection lens assembly from the light incident surface and is projected onto the projection surface by the projection lens assembly. Through the above method, the application can improve the projection effect.

Description

[Technical Field]

[0001] The present application relates to the technical field of projection equipment, and in particular to a projection apparatus, a projection lens assembly and a projection system. [Background Art]

[0002] Currently, commercially available projection equipment generally uses a flat display device as an image source. The sharp image projected by a flat display device via a projection lens is a flat image. When projection equipment is used with a curved projection screen, there are aberrations caused by the design of the projection lens. Therefore, when a flat display device projects an image onto the curved projection screen via the projection lens, defocus occurs at the center and both sides of the image projected on the curved projection screen, resulting in that the image cannot be sharply focused at the center and both sides of the curved projection screen at the same time, which leads to poor projection effect and impairs the user's visual experience. [Summary of the Invention] [Means for Solving the Problems]

[0003] In view of this, the present invention provides a projection apparatus, a projection lens assembly and a projection system, which can improve the projection effect.

[0004] In order to solve the above technical problem, the technical solution adopted in the present application provides a projection apparatus. The projection apparatus comprises a display device, the display device has a curved display surface, and the curvature of the display surface matches the curvature of the projection surface of a projection screen. The projection apparatus further comprises a projection lens assembly, a light incident surface of the projection lens assembly is a flat surface and / or an arcuate surface protruding toward the display surface. A light beam output from the display surface enters the projection lens assembly from the light incident surface, and is projected onto the projection surface by the projection lens assembly.

[0005] In one embodiment of the present invention, the display device includes a first display device, a second display device, and a third display device, each capable of outputting images of different colors, and the projection lens assembly includes a first lens to a third lens arranged in order along the circumferential direction, each of the first to third lenses having a light-receiving surface that corresponds one-to-one with the display surfaces of the first to third display devices.

[0006] In one embodiment of the present invention, a first film layer is provided between a first lens and a second lens, and on the surface of the third lens away from the second lens, and the first film layer can reflect the light beam output from the first display device and transmit the light beams output from the second and third display devices. A second film layer is provided between the second lens and a third lens, and on the surface of the first lens away from the second lens, and the second film layer can reflect the light beam output from the third display device and transmit the light beams output from the first and second display devices.

[0007] In one embodiment of the present application, the curvature of the display surface of the first display device, the curvature of the display surface of the second display device, and the curvature of the display surface of the third display device are equal.

[0008] In one embodiment of the present invention, the second side surface of the first lens is a curved surface projecting toward the first display device, the second side surface of the second lens is a curved surface projecting toward the second display device, and the second side surface of the third lens is a curved surface projecting toward the third display device.

[0009] In one embodiment of the present invention, the curvature of the second side surface of the first lens is equal to the curvature of the display surface of the first display device, the curvature of the second side surface of the second lens is equal to the curvature of the display surface of the second display device, and the curvature of the second side surface of the third lens is equal to the curvature of the display surface of the third display device.

[0010] In one embodiment of the present invention, the light-receiving surfaces of the first to third lenses are all flat.

[0011] In one embodiment of the present invention, the first display device and the first lens are spaced apart from each other, the second display device and the second lens are spaced apart from each other, and the third display device and the third lens are spaced apart from each other, thereby forming an adjustment gap.

[0012] In one embodiment of the present invention, the projection lens assembly further includes a group of photochromic lenses, the first to third lenses and the group of photochromic lenses are arranged sequentially along the circumferential direction, and the light beams incident on the first to third lenses are all emitted from the group of photochromic lenses.

[0013] In one embodiment of the present invention, the photochromic lens group includes a plurality of photochromic lenses arranged sequentially along the direction of light beam propagation, or the photochromic lens group includes an arc-shaped mirror projecting in the direction of light beam propagation.

[0014] To solve the above technical problems, the present application provides, as one technical solution, a projection lens assembly which is applied to the projection apparatus according to the above embodiment, and the projection lens assembly includes a color-combining lens group and a photochromic lens group, wherein the light beam integrated by the color-combining lens group is incident on the photochromic lens group and then emitted by the photochromic lens group.

[0015] To solve the above technical problems, the present invention provides a projection system as an alternative technical solution. The projection system includes a projection device according to the above embodiment and a projection screen, the projection screen having a projection surface, and a light beam output from the display device of the projection device is projected onto the projection surface by a projection lens assembly.

[0016] The beneficial effects of this invention are as follows. Unlike the prior art, this invention provides a projection device, a projection lens assembly, and a projection system. The display surface of the display device of the projection device is curved, meaning that the sharp image projected by the display device through the projection lens assembly is a curved image. Furthermore, if the projection surface of the projection screen is also curved, the curvature of the display surface matches the curvature of the projection surface. As a result, the curvature of the sharp image projected by the display device matches the curvature of the projection surface, allowing the sharp image projected by the display device to be displayed on the projection surface as completely as possible. In other words, the middle and both sides of the projection surface can be sharply focused simultaneously, and the middle and both sides of the image projected onto the projection surface can all be sharply imaged. That is, the image projected onto the projection surface is sharp, the overall sharpness is consistent, the projection effect can be improved, and this is advantageous for improving the user's visual experience.

[0017] Herein, the drawings are incorporated into the specification and constitute part of this specification, illustrating the principles of the present application together with the specification by showing embodiments that conform to the present application. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but rather to explain the concepts of the present application to those skilled in the art by referring to specific embodiments. [Brief explanation of the drawing]

[0018] [Figure 1] This is a schematic diagram of one embodiment of a conventional curved surface projection display system. [Figure 2] This is a schematic diagram of one embodiment of the projection device according to the present invention. [Figure 3] This is a schematic diagram of one embodiment of the projection system according to the present application. [Figure 4] This is a schematic diagram of one embodiment of the display device and color synthesis lens assembly according to the present application. [Figure 5] This is a schematic diagram of one embodiment of the prismatic body according to the present invention. [Figure 6] Figure 4 is a schematic diagram of the color synthesis lens assembly viewed from a different angle. [Figure 7]It is a diagram showing the optical path of the display device and the color combining lens assembly shown in FIG. 4. [Figure 8] It is a schematic configuration diagram of an embodiment of a first display device and a first lens according to the present application. [Figure 9] It is a schematic configuration diagram of another embodiment of a first display device and a first lens according to the present application. [Figure 10] It is a schematic configuration diagram of another embodiment of a projection device according to the present application. [Figure 11] It is a schematic configuration diagram of an embodiment of a projection lens assembly according to the present application. [Figure 12] It is a schematic configuration diagram of another embodiment of a projection system according to the present application. DETAILED DESCRIPTION OF THE INVENTION

[0019] To clarify the objects, technical solutions and advantages of the present application, the following clearly and completely describes the technical solutions according to the embodiments of the present application with reference to the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments that can be conceived by those skilled in the art without creative efforts all fall within the protection scope of the present invention. Where there is no contradiction, the embodiments and the features in the embodiments below may be combined with each other.

[0020] To solve the technical problem in the prior art that the uniformity of sharpness of an image projected by a projection device onto a curved projection screen is low, an embodiment of the present application provides a projection apparatus. The projection apparatus includes a display device, the display device has a curved display surface, the curvature of the display surface matches the curvature of the projection surface of the projection screen, the projection apparatus further includes a projection lens assembly, a light incident surface of the projection lens assembly is a plane and / or an arcuate surface protruding toward the display surface, a light beam output from the display surface enters the projection lens assembly through the light incident surface and is projected onto the projection surface by the projection lens assembly. The detailed description will be given below.

[0021] With the advent of curved televisions, curved display systems have gained popularity in recent years. They have the advantage of being large in size and providing viewers with a sense of presence and immersion when viewed from a close distance. However, the size of curved televisions is limited; currently, many televisions are 85 inches or smaller, and most curved televisions are concentrated around 55 inches. As a result, current curved televisions are too small to provide viewers with sufficient immersion and immersion, and their popularity is declining. Large-sized curved projection display systems applied in entertainment facilities such as large movie theaters and amusement parks can certainly provide viewers with a sense of presence, and these are currently considered to be the best curved display systems for an immersive experience. In the trend of increasing screen sizes, curved display systems remain a suitable means of differentiation.

[0022] In the curved projection display system described above, the projection devices currently in use typically use planar display devices. As is well known, the sharp image projected by a planar display device through a projection lens is also a planar image. As shown in Figure 1, the sharp image A projected by the planar display device 11 through the projection lens 12 is a planar image. Due to aberrations in the design of the projection lens, there is a focus shift in the middle and on both sides of the image projected onto the curved projection screen, meaning that the middle and on both sides of the image on the curved projection screen cannot be sharply imaged simultaneously. Referring to Figure 1, the actual image B projected by the planar display device 11 onto the curved projection screen 13 is a curved image. Of this, the middle part of the actual image B can be sharply imaged, while the sides cannot be sharply imaged. In other words, the planar display devices installed in current curved projection display systems have low consistency in the sharpness of the projected image, which negatively impacts the user's visual experience.

[0023] In view of this, one embodiment of the present invention provides a projection device that improves the consistency of the clarity of projected images, that is, improves the projection effect, and is advantageous in improving the user's visual experience.

[0024] Refer to Figure 2, which is a schematic diagram of one embodiment of the projection device according to the present invention.

[0025] In one embodiment, the projection device 20 includes a display device 21 and a projection lens assembly, which are arranged opposite each other. The display device 21 has a display surface 23 that can emit light and form an image. The projection lens assembly projects the image output from the display surface 23 onto the projection surface of a projection screen, and a rational design of the projection lens assembly can improve the overall optical performance and luminous efficiency of the projection device 20.

[0026] The display device 21 can employ display technologies such as LCD (Liquid Crystal Display), LCOS (Liquid Crystal on Silicon), DLP (Digital Light Processing), OLED (Organic Light-Emitting Diode), MEMS (Micro-Electro-Mechanical System), and Micro-LED (Micro-Light-Emitting Diode). The display device 21 determines the main parameters of the entire projection device 20, such as brightness, contrast, resolution, and color gamut. The above-mentioned display technologies such as LCD, LCOS, DLP, and MEMS are mainly applied to flat displays, while OLED and Micro-LED are both designed as flexible devices to realize curved surface displays. Among these, Micro-LED display technology offers high brightness, reaching hundreds of thousands of nits or more, and allows for corresponding designs with higher pixel densities. Its semiconductor light-emitting diodes are small, on the order of microns, with a PPI (Pixels Per Inch) greater than 5000 and a contrast ratio of 100,000:1 or higher. Furthermore, Micro-LED display technology has a wide color gamut, fast response speed, can operate at temperatures from -70°C to 100°C, and has a long service life. Therefore, as one embodiment, the display device 21 uses Micro-LED display technology.

[0027] Of course, in other embodiments of the present invention, the display device 21 may use display technologies other than Micro-LED display technology, such as LCD, LCOS, DLP, MEMS, etc., as mentioned above. Furthermore, the display device 21 itself may be flexible, and its display surface 23 may be curved by the bending motion of the display device 21 itself, or of course, the display device 21 itself may not be flexible, and its display surface 23 may be directly designed to be curved.

[0028] Figure 3 is a schematic diagram of one embodiment of the projection system of the present invention.

[0029] The projection device 20 can be applied to the curved surface projection display system described above, namely, the projection screen 30 has a curved projection surface 31. Furthermore, the projection surface 31 is concave with respect to incident light. In other words, the projection surface 31 is concave along the direction of propagation of the incoming light beam. To match the requirement of curved image formation on the projection surface 31, the display surface 23 of the display device 21 in this embodiment is also curved. In other words, the display surface 23 of the display device 21 is provided to be curved. As shown in Figure 3, since the sharp image C projected by the projection lens assembly onto the curved display surface 23 is a curved image, the sharp image C projected by the display device 21 can be displayed as completely as possible on the similarly curved projection surface 31. In other words, the middle and both sides of the projection surface 31 can be focused as sharply as possible simultaneously, and the middle and both sides of the image projected onto the projection surface 31 can be imaged as sharply as possible. That is, the image projected onto the projection surface 31 is sharp, the overall sharpness is consistent, out-of-focus and blurring phenomena can be avoided as much as possible, and the projection effect can be improved, which is advantageous for improving the user's visual experience. Since the display surface 23 of the display device 21 is provided in a curved shape, it can surround the outer periphery of a part of the light-receiving surface of the projection lens assembly, and the projection lens assembly guides the light beam emitted from the display surface 23 from the outer periphery of the surrounded part of the light-receiving surface to the outer periphery of the other part of the light-receiving surface that is away from the display surface 23 and not surrounded, and projects it onto the projection surface 31. In this way, by providing a curved display surface 23 and surrounding the outer periphery of a part of the projection lens assembly, the light beam can be emitted from the other part of the outer periphery that is not surrounded to the curved projection surface 31, and the light beam can be projected more efficiently onto the projection surface 31. The image projected onto the projection surface 31 is clear, the overall clarity is consistent, and out-of-focus and blurring phenomena are avoided as much as possible. Furthermore, the projection effect can be improved, which is advantageous in improving the user's visual experience.

[0030] Furthermore, the fact that the curvature of the display surface 23 matches the curvature of the projection surface 31 means that the curvature of the display surface 23 and the curvature of the projection surface 31 are the same or close. In this way, the curvature of the sharp image C projected by the display device 21 matches the curvature of the projection surface 31, further guaranteeing the complete display of the sharp image C projected by the display device 21 on the projection surface 31, further guaranteeing that the middle and both sides of the projection surface 31 are simultaneously in sharp focus, as shown in Figure 3, further guaranteeing that the middle and both sides of the image projected onto the projection surface 31 are imaged as sharply as possible, further improving the consistency of the sharpness of the image projected onto the projection surface 31, further improving the projection effect, which is advantageous in further improving the user's visual experience.

[0031] Refer to Figures 2 and 4, where Figure 4 is a schematic diagram of one embodiment of the display device and color synthesis lens assembly according to the present application.

[0032] In one embodiment, the display device 21 includes a first display device 211, a second display device 212, and a third display device 213, each capable of outputting a different color of light beam. The projection lens assembly includes a group of color-combining lenses 24 for integrating the light beams output from the first display device 211, the second display device 212, and the third display device 213 and projecting them onto a projection screen.

[0033] Preferably, the first display device 211, the second display device 212, and the third display device 213 can output luminous beams of the three primary colors. For example, the first display device 211 can output a red luminous beam, the second display device 212 can output a green luminous beam, and the third display device 213 can output a blue luminous beam. The luminous beams output from the three display devices 211, 212, and 213 are integrated by the color-combining lens group 24.

[0034] Furthermore, the images output from the first display device 211, the second display device 212, and the third display device 213 differ only in color; the content of the images output by the three devices is identical.

[0035] Of course, in other embodiments of the present invention, the first display device 211, the second display device 212, and the third display device 213 are not limited to outputting only primary color images. The colors of the images output by the three devices, the first display device 211, the second display device 212, and the third display device 213, only need to be integrated by the color synthesis lens group 24 to produce an image that satisfies the requirements, and this is not a limitation.

[0036] In view of the design in the above embodiment where the display surface 23 of the display device 21 is curved, in this embodiment, the display surface 231 of the first display device 211, the display surface 232 of the second display device 212, and the display surface 233 of the third display device 213 all face the color-combining lens group 24, and the light beams output from the three display devices 211, 212, and 213 can be projected onto the projection lens assembly through the color-combining lens group 24. Furthermore, the display surface 231 of the first display device 211, the display surface 232 of the second display device 212, and the display surface 233 of the third display device 213 are all recessed in the direction away from the color-combining lens group 24.

[0037] Furthermore, the curvature of the display surface 231 of the first display device 211, the curvature of the display surface 232 of the second display device 212, and the curvature of the display surface 233 of the third display device 213 are equal. This is advantageous in ensuring that the light beams output from the three display devices 211, 212, and 213 have good consistency after being integrated by the color-combining lens group 24, and is further advantageous in improving the projection effect.

[0038] Next, we will refer to Figures 2, 4, and 5, where Figure 5 is a schematic diagram of one embodiment of the prismatic body according to the present application.

[0039] In one embodiment, the color-compounding lens group 24 includes a first lens 241, a second lens 242, and a third lens 243. The first lens 241, the second lens 242, and the third lens 243 are all prismatic bodies 40. As shown in Figure 5, the sides of the prismatic body 40 include a first side 42, a light-receiving surface 43, and a second side 44 connected in order. The sides of the first side 42 and the second side 44 are connected at the edges away from the light-receiving surface 43, and the edge to which the first side 42 and the second side 44 are connected is a common edge, which is the target edge 41. Preferably, the first to third lenses 241 to 243 may all be provided in a sector-shaped prismatic form, and the light-receiving surfaces of the first to third lenses 241 to 243 may all be provided in an arcuate shape. As shown in Figure 4, the first lens 241, the second lens 242, and the third lens 243 are arranged in order along the circumferential direction (the direction indicated by the dashed arrow in Figure 4; the same applies hereafter). The target edge 411 of the first lens 241, the target edge 412 of the second lens 242, and the target edge 413 of the third lens 243 come into contact with each other, causing the target edges 411 of the first lens 241, 412 of the second lens 242, and 413 of the third lens 243 to overlap. For example, if the first and second sides of the prism are arranged in order along the circumferential direction, the second side 441 of the first lens 241 and the first side 422 of the second lens 242 are close to each other, and the second side 442 of the second lens 242 and the first side 423 of the third lens 243 are close to each other. Preferably, the first lens 241 to the third lens 243 are joined together to form at least a part of a cylindrical body.

[0040] Furthermore, as shown in Figure 6, the heights of the first lens 241, the second lens 242, and the third lens 243 are the same, the top surfaces of the three lenses 241, 242, and 343 are on the same plane, and the bottom surfaces of the three lenses are also on the same plane. Figure 4 shows a top view of the color-compounding lens group shown in Figure 6.

[0041] As shown in Figure 4, each of the first lens 241 to the third lens 243 has a light-receiving surface that corresponds one-to-one with the display surfaces of the first display device 211 to the third display device 213.

[0042] Specifically, the display surface 231 of the first display device 211 faces the light-receiving surface 431 of the first lens 241, so the light beam output from the first display device 211 passes through the light-receiving surface 431 of the first lens 241 and enters the first lens 241; the display surface 232 of the second display device 212 faces the light-receiving surface 432 of the second lens 242, so the light beam output from the second display device 212 passes through the light-receiving surface 432 of the second lens 242 and enters the second lens 242; and the display surface 233 of the third display device 213 is positioned on the light-receiving surface 433 of the third lens 243, so the light beam output from the third display device 213 passes through the light-receiving surface 433 of the third lens 243 and enters the third lens 243.

[0043] As shown in Figure 7, a first film layer 245 is provided between the first lens 241 and the second lens 242, and on the surface of the third lens 243 away from the second lens 242. The first film layer 245 can reflect the light beam output from the first display device 211 and transmit the light beams output from the second display device 212 and the third display device 213. As a result, the light beam output from the first display device 211, after being incident on the first lens 241, The luminous beam output from the second display device 212 is reflected by the first film layer 245, travels toward the side of the first lens 241 and the third lens 243 away from the second lens 242, and is emitted from the side of the first lens 241 and the third lens 243 away from the second lens 242. After being incident on the second lens 242, as shown in Figure 7, the luminous beam passes through the first film layer 245 and is emitted from the side of the first lens 241 and the third lens 243 away from the second lens 242.

[0044] As shown in Figure 7, a second film layer 246 is provided between the second lens 242 and the third lens 243, and on the surface of the first lens 241 away from the second lens 242. The second film layer 246 can reflect the light beam output from the third display device 213 and transmit the light beams output from the first display device 211 and the second display device 212. As a result, the light beam output from the third display device 213 enters the third lens 243 and then passes through the second film layer. The luminous beam, reflected by layer 246, travels toward the side of the first lens 241 and the third lens 243 away from the second lens 242, and is emitted from the side of the first lens 241 and the third lens 243 away from the second lens 242. The luminous beam output from the second display device 212, after being incident on the second lens 242, passes through the second lens 242 and the second film layer 246, as shown in Figure 7, and is emitted from the side of the first lens 241 and the third lens 243 away from the second lens 242.

[0045] Referring to Figure 7, one reason why the first film layer 245 transmits the light beam output from the third display device 213 is to allow the light beam output from the third display device 213 to pass through the first film layer 245 and reach the second film layer 246. Specifically, this allows the light beam output from the third display device 213 to pass through the first film layer 245 on the surface of the third lens 243 that is away from the second lens 242. The second is to enable the light beam output from the third display device 213 to be reflected by the second film layer 246, then transmitted through the first film layer 245, and reach and be emitted from the side of the first lens 241 and the third lens 243 away from the second lens 242. Specifically, this enables the light beam output from the third display device 213 to be reflected by the second film layer 246 between the second lens 242 and the third lens 243, and then transmitted through the first film layer 245 on the surface of the third lens 243 away from the second lens 242.

[0046] One reason why the second film layer 246 transmits the light beam output from the first display device 211 is to allow the light beam output from the first display device 211 to pass through the second film layer 246 and reach the first film layer 245. Specifically, this allows the light beam output from the first display device 211 to pass through the second film layer 246 on the surface of the first lens 241 that is away from the second lens 242. The second is to enable the light beam output from the first display device 211 to be reflected by the first film layer 245, then pass through the second film layer 246, and reach and be emitted from the side of the first lens 241 and the third lens 243 that is away from the second lens 242. Specifically, it enables the light beam output from the first display device 211 to be reflected by the second film layer 245 between the first lens 241 and the second lens 242, and then pass through the second film layer 246 on the surface of the first lens 241 that is away from the second lens 242.

[0047] In this manner, the light rays emitted by the first display device 211, the second display device 212, and the third display device 213 enter the first lens 241, the second lens 242, and the third lens 243, then pass through the first lens 241 to the third lens 243, and merge on the side of the first lens 241 and the third lens 243 away from the second lens 242. As a result, the light rays emitted by the first display device 211, the second display device 212, and the third display device 213 are integrated and projected onto the projection screen.

[0048] Based on the above example in which the first display device 211 can output a red light beam, the second display device 212 can output a green light beam, and the third display device 213 can output a blue light beam, the first film layer 245 can reflect red light and transmit green and blue light, and the second film layer 246 can reflect blue light and transmit red and green light.

[0049] Preferably, the first film layer 245 may be a red light reflective film that reflects red light and transmits green and blue light. The second film layer 246 may be a blue light reflective film that reflects blue light and transmits red and green light. The specific material components of the red light reflective film and the blue light reflective film are within the realm of understanding for those skilled in the art and therefore will not be described here.

[0050] Next, refer to Figure 4. In one embodiment, the light-receiving surface 431 of the first lens 241 is a curved surface that protrudes toward the first display device 211, thereby matching the curvature of the display surface 231 of the first display device 211 as closely as possible.

[0051] The fact that the curvature of the light-receiving surface 431 of the first lens 241 matches the curvature of the display surface 231 of the first display device 211 means that the curvature of the light-receiving surface 431 of the first lens 241 and the curvature of the display surface 231 of the first display device 211 are the same or close to each other. For example, as shown in Figure 8, the curvature of the light-receiving surface 431 of the first lens 241 is the same as the curvature of the display surface 231 of the first display device 211. When the light beam output from each position on the display surface 231 of the first display device 211 propagates to the light-receiving surface 431 of the first lens 241, the light beam output from the display surface 231 is perpendicular to the tangent plane P at the position of the incident point O on the light-receiving surface 431 and incident on the first lens 241 (i.e., the light beam output from the display surface 231 travels along the theoretical optical path). By avoiding reflection and refraction of the light beam as it enters the first lens 241 as much as possible, it is possible to avoid light loss and deviation of the actual optical path of the light beam from the theoretical optical path, which is advantageous for improving the projection effect.

[0052] Similarly, the light-receiving surface 432 of the second lens 242 is a curved surface that protrudes toward the second display device 212, thereby matching the curvature of the display surface 232 of the second display device 212 as closely as possible, minimizing reflection and refraction of the light beam output from the second display device 212 as it enters the second lens 242, which is further advantageous for improving the projection effect.

[0053] Similarly, the light-receiving surface 433 of the third lens 243 is a curved surface that protrudes toward the third display device 213, thereby matching the curvature of the display surface 233 of the third display device 213 as closely as possible, minimizing reflection and refraction of the light beam output from the third display device 213 as it enters the third lens 243, which is further advantageous for improving the projection effect.

[0054] Furthermore, the curvature of the light-receiving surface 431 of the first lens 241 is equal to the curvature of the display surface 231 of the first display device 211. In this way, it is ensured to the greatest extent possible that the light beam output from the first display device 211 enters the first lens 241 along the normal, and reflection and refraction when the light beam output from the first display device 211 enters the first lens 241 are avoided to the greatest extent possible, which is further advantageous for improving the projection effect.

[0055] The curvature of the light-receiving surface 432 of the second lens 242 is equal to the curvature of the display surface 232 of the second display device 212. In this way, it is ensured to the greatest extent that the light beam output from the second display device 212 enters the second lens 242 along the normal, and reflection and refraction when the light beam output from the second display device 212 enters the second lens 242 are avoided to the greatest extent possible, which is further advantageous for improving the projection effect.

[0056] The curvature of the light-receiving surface 433 of the third lens 243 is equal to the curvature of the display surface 233 of the third display device 213. In this way, it is ensured to the greatest extent that the light beam output from the third display device 213 enters the third lens 243 along the normal, and reflection and refraction when the light beam output from the third display device 213 enters the third lens 243 are avoided to the greatest extent possible, which is further advantageous for improving the projection effect.

[0057] In the above embodiment, the curvature of the display surface 231 of the first display device 211, the curvature of the display surface 232 of the second display device 212, and the curvature of the display surface 233 of the third display device 213 are equal. In this embodiment, however, the curvature of the light-receiving surface 431 of the first lens 241, the curvature of the light-receiving surface 432 of the second lens 242, and the curvature of the light-receiving surface 433 of the third lens 243 are also equal.

[0058] In alternative embodiments, the light-receiving surfaces of the projection lens assembly may be planar, that is, the light-receiving surfaces of the first lens 241 to the third lens 243 may be planar. Specifically, the light-receiving surface 431 of the first lens 241 is planar, the light-receiving surface 432 of the second lens 242 is planar, and the light-receiving surface 433 of the third lens 243 is planar. As shown in Figure 9, an example is taken where the light-receiving surface 431 of the first lens 241 is planar. Preferably, the first lens 241 to the third lens 243 are all provided in a triangular prism shape so that the light-receiving surfaces of the projection lens assembly are provided in a joined multi-planar shape, and the light-receiving surfaces of the first lens 241 to the third lens 243 may all be planar. Preferably, the first lens 241 to the third lens 243 are joined together to form at least a part of a rectangular prism.

[0059] Furthermore, the display surface of the display device in the embodiment of this application is designed to be curved (for example, the display surface 231 of the first display device 211 in Figure 9 is curved), and its curvature matches the curvature of the projection surface of the projection screen. This improves the consistency of the clarity of the projected image to some extent and is advantageous in ensuring to some extent that different parts of the projected image are simultaneously in sharp focus. It can be seen that the design of the projection lens assembly having a flat light-receiving surface is similarly consistent with the design concept of the embodiment of this application.

[0060] Of course, in other embodiments of the present application, the light-receiving surface of the projection lens assembly may be partially curved and partially flat. Specifically, the light-receiving surfaces of some of the first lenses 241 to the third lenses 243 may be curved and the light-receiving surfaces of some of the lenses may be flat, but this is not limited to the present invention.

[0061] In one embodiment, the first display device 211 is positioned between the plane on which the first side surface 421 of the first lens 241 is located and the plane on which the second side surface 441 of the first lens 241 is located. In other words, the first display device 211 is positioned between the extending plane of the first side surface 421 of the first lens 241 and the extending plane of the second side surface 441 of the first lens 241. In this way, the light beam output from the first display device 211 can all be incident on the first lens 241, which is further advantageous for improving the projection effect.

[0062] The second display device 212 is positioned between the plane on which the first side surface 422 of the second lens 242 is located and the plane on which the second side surface 442 of the second lens 242 is located. In other words, the second display device 212 is positioned between the extending plane of the first side surface 422 of the second lens 242 and the extending plane of the second side surface 442 of the second lens 242. In this way, the light beam output from the second display device 212 can all be incident on the second lens 242, which is further advantageous for improving the projection effect.

[0063] The third display device 213 is positioned between the plane on which the first side surface 423 of the third lens 243 is located and the plane on which the second side surface 443 of the third lens 243 is located. In other words, the third display device 213 is positioned between the extending plane of the first side surface 423 of the third lens 243 and the extending plane of the second side surface 443 of the third lens 243. In this way, the light beam output from the third display device 213 can all be incident on the third lens 243, which is further advantageous for improving the projection effect.

[0064] Next, refer to Figure 4. In one embodiment, the first display device 211 and the first lens 241 are spaced apart from each other, the second display device 212 and the second lens 242 are spaced apart from each other, and the third display device 213 and the third lens 243 are spaced apart from each other, forming an adjustable gap D. By positioning the display devices and corresponding lenses spaced apart in this way, the relative position between the display devices and lenses can be adjusted more flexibly, avoiding the manufacturing precision requirements that come with designs that bring the display devices and lenses into close contact, and simplifying the assembly and production process of the projection device. For example, the adjustable gap D affects the design of the back focal length (BFD) of the projection system, and the size of the adjustable gap D can be adjusted so that the back focal length of the projection system meets the requirements of the product.

[0065] Next, refer to Figures 2, 4, and 6. In one embodiment, the projection lens assembly further includes a photochromic lens group 25, and the light beam integrated by the color-combining lens group 24 is incident on the photochromic lens group 25 and then emitted from the photochromic lens group 25. The first lenses 241 to the third lenses 243 and the photochromic lens group 25 are arranged in order along the circumferential direction, and the light beams incident on the first lenses 241 to the third lenses 243 are all emitted from the photochromic lens group 25.

[0066] In one embodiment, the photochromic lens group 25 includes an arc-shaped mirror projecting in the direction of light beam propagation. Specifically, the photochromic lens group 25 includes a fourth lens 251, and the fourth lens 251 is the arc-shaped mirror. The first lens 241, the second lens 242, the third lens 243, and the fourth lens 251 are arranged in order along the circumferential direction. The fourth lens 251 is similarly a prismatic body, and the target edge 411 of the first lens 241, the target edge 412 of the second lens 242, the target edge 413 of the third lens 243, and the target edge 414 of the fourth lens 251 overlap.

[0067] In other embodiments, the fourth lens 251 may be an arc-shaped mirror with a sheet-like structure that protrudes in the direction of light emission. In this case, a light mixing space exists between the fourth lens 251 and the first lenses 241 to the third lenses 243, and after the light rays are emitted from the first lenses 241 to the third lenses 243, they pass through this mixing space and enter the fourth lens 251.

[0068] For example, taking the case where the first and second sides of the prism are provided sequentially along the circumferential direction, as shown in Figure 4, the second side 444 of the fourth lens 251 and the first side 421 of the first lens 241 are close to each other, and the first side 424 of the fourth lens 251 and the second side 443 of the third lens 243 are close to each other. Also, as shown in Figure 6, the heights of the first lens 241, the second lens 242, the third lens 243, and the fourth lens 251 are the same, the top surfaces of the four lenses 241, 242, 343, and 451 are on the same plane, and the bottom surfaces of the four lenses are also on the same plane.

[0069] The fourth lens 251 is located on the side of the first lens 241 and the third lens 243 away from the second lens 242. A first film layer 245 is provided between the third lens 243 and the fourth lens 251, and a second film layer 246 is provided between the first lens 241 and the fourth lens 251. The fourth lens 251 integrates the light beams output from the first display device 211, the second display device 212, and the third display device 213 and projects them onto the projection lens assembly. In other words, the light beam projected by the first display device 211 after passing through the first lens 241, the light beam projected by the second display device 212 after passing through the second lens 242, and the light beam projected by the third display device 213 after passing through the third lens 243 merge at the fourth lens 251, thereby integrating the light beams output by the three devices: the first display device 211, the second display device 212, and the third display device 213.

[0070] As shown in Figure 7, the light beam output from the first display device 211 enters the first lens 241, is reflected by the first film layer 245, then enters the fourth lens 251, and is finally emitted from the fourth lens 251. The light beam output from the second display device 212 enters the second lens 242, passes directly through the first film layer 245 and the second film layer 246, then enters the fourth lens 251, and is finally emitted from the fourth lens 251. The light beam output from the third display device 213 enters the third lens 243, is reflected by the second film layer 246, then enters the fourth lens 251, and is finally emitted from the fourth lens 251.

[0071] The fourth lens 251 is involved in the design of the back focus of the projection device 20, and the material selection of the fourth lens 251 and the curvature of the light-receiving surface 434 of the fourth lens 251 all affect the back focus of the entire projection device 20. In this embodiment, the curvature of the light-receiving surface 434 of the fourth lens 251 may differ from that of the first lens 241, the second lens 242, and the third lens 243 and match the design of the entire optical system of the projection device 20. For example, the curvature of the light-receiving surface 434 of the fourth lens 251 may match the design of the focal length of the projection lens assembly, thereby increasing the light utilization rate and luminous efficiency of the entire optical system. Additional lenses may be added between the fourth lens 251 and the projection lens assembly to further improve the light utilization rate and luminous efficiency of the entire optical system, but this is not limited to this embodiment.

[0072] Of course, in other embodiments of the present application, the curvature of the light-receiving surface 434 of the fourth lens 251 may be the same as that of the first lens 241, the second lens 242, and the third lens 243. In particular, in the above embodiment, when the curvature of the light-receiving surface 431 of the first lens 241, the curvature of the light-receiving surface 432 of the second lens 242, and the curvature of the light-receiving surface 433 of the third lens 243 are equal, the first lens 241, the second lens 242, the third lens 243, and the fourth lens 251 have a sector-shaped cross-section along their respective height directions, and the first lens 241, the second lens 242, the third lens 243, and the fourth lens 251 constitute a perfect cylinder. Furthermore, the projection lens assembly in the embodiments of the present application may not include the fourth lens 251 and may only include the first lens 241, the second lens 242, and the third lens 243 described in the above embodiment.

[0073] In an alternative embodiment, as shown in Figure 10, unlike the above embodiment, the photochromic lens group 25 of this embodiment may be a plurality of photochromic lenses arranged sequentially along the direction of light beam propagation. Specifically, the plurality of photochromic lenses may include a fifth lens 252 and a sixth lens 253 arranged sequentially along the direction of light beam propagation.

[0074] The light beam output from the first display device 211 to the first lens 241 propagates to the fifth lens 252, the light beam output from the second display device 212 to the second lens 242 propagates to the fifth lens 252, and the light beam output from the third display device 213 to the third lens 243 propagates to the fifth lens 252. The light beams propagated from the first to third display devices 211 to the fifth lens 252 are then aligned at the fifth lens 252, and the aligned light beams propagate to the sixth lens 253, which projects the light onto the projection screen.

[0075] Through the above method, the design of the fifth lens 252 and the sixth lens 253 can further improve the light utilization rate of the entire projection system and enhance luminous efficiency. Of course, the photochromic lenses included in the photochromic lens group 25 of this embodiment are not limited to the fifth lens 252 and the sixth lens 253 described above, and are not limited thereto.

[0076] In short, in the projection device according to the present invention, the display surface of the display device is curved, that is, the sharp image projected by the display device through the projection lens assembly is a curved image. Furthermore, if the projection surface of the projection screen is also curved, the curvature of the display surface matches the curvature of the projection surface, and as a result, the curvature of the sharp image projected by the display device matches the curvature of the projection surface, allowing the sharp image projected by the display device to be displayed on the projection surface as completely as possible. In other words, the middle and both sides of the projection surface can be sharply focused simultaneously, and the middle and both sides of the image projected onto the projection surface can all be sharply imaged, that is, the image projected onto the projection surface is sharp and the overall sharpness is consistent, improving the projection effect and which is advantageous in improving the user's visual experience.

[0077] Refer to Figure 11, which is a schematic diagram of one embodiment of the projection lens assembly according to the present application.

[0078] In one embodiment, the projection lens assembly is applied to the projection device according to the above embodiment. The projection lens assembly includes a color-combining lens group 24 and a photochromic lens group 25. The light beam matched by the color-combining lens group 24 is incident on the photochromic lens group 25 and then emitted by the photochromic lens group 25. The projection lens assembly has been described in detail in the above embodiment, so its description is omitted here.

[0079] Refer to Figure 12, which is a schematic diagram of another embodiment of the projection system according to the present application.

[0080] In one embodiment, the projection system includes a projection device 20 and a projection screen 30. The projection device 20 may be as described in the above embodiment. The projection screen 30 has a projection surface 31, and the light beam output from the display device 21 of the projection device 20 is projected onto the projection surface 31 by a projection lens assembly.

[0081] Furthermore, unless otherwise explicitly stated or limited, terms such as "connection," "connection," and "overlapping" in this application should be understood in a broad sense. For example, these may be fixed connections, detachable connections, integral connections, direct connections, indirect connections via an intermediate medium, internal communication between two parts, or interaction relationships between two parts. A person skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0082] Finally, it should be noted that the above embodiments are for illustrating the technical proposal of the present application, and are not limiting. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical means described in the above embodiments or substitute some or all of their technical features with equivalents, and such modifications or changes will not cause the essence of the corresponding technical means to deviate from the scope of the technical means of the embodiments of the present application.

Claims

1. A projection apparatus comprising a projection screen, a display device, and a projection lens assembly, The display device has a curved display surface, and the curvature of the curved display surface matches the curvature of the projection surface of the projection screen. The light-receiving surface of the projection lens assembly is an arc-shaped surface that protrudes toward the curved display surface. The projection lens assembly is provided between the display device and the projection surface of the projection screen in the projection device.

2. The display device includes a first display device, a second display device, and a third display device, the first display device, the second display device, and the third display device each output images of different colors. The projection lens assembly includes a first lens, a second lens, and a third lens arranged in order along the circumferential direction. The light-receiving surface of the first lens corresponds to the first display device, The light-receiving surface of the second lens corresponds to the second display device, The projection apparatus according to claim 1, wherein the light-receiving surface of the third lens corresponds to the third display device.

3. A first film layer provided between the first lens and the second lens, configured to reflect the light beam output from the first display device and transmit the light beams output from the second display device and the third display device, The projection apparatus according to claim 2, further comprising: a second film layer provided between the second lens and the third lens, configured to reflect a light beam output from the third display device and transmit light beams output from the first display device and the second display device.

4. The projection apparatus according to claim 2, wherein the curvature of the display surface of the first display device, the curvature of the display surface of the second display device, and the curvature of the display surface of the third display device are equal.

5. The light-receiving surface of the first lens is a curved surface that protrudes toward the first display device. The light-receiving surface of the second lens is a curved surface that protrudes toward the second display device. The projection apparatus according to claim 2, wherein the light-receiving surface of the third lens is a curved surface that protrudes toward the third display device.

6. The curvature of the light-receiving surface of the first lens is equal to the curvature of the display surface of the first display device. The curvature of the light-receiving surface of the second lens is equal to the curvature of the display surface of the second display device. The projection apparatus according to claim 2, wherein the curvature of the light-receiving surface of the third lens is equal to the curvature of the display surface of the third display device.

7. The projection apparatus according to claim 2, wherein the light-receiving surfaces of the first lens, the second lens, and the third lens are all flat.

8. The projection apparatus according to claim 2, wherein the first display device and the first lens are spaced apart from each other, the second display device and the second lens are spaced apart from each other, and the third display device and the third lens are spaced apart from each other.

9. The projection lens assembly further includes a group of photochromic lenses, The first lens, the second lens, the third lens, and the photochromic lens group are arranged in order along the circumferential direction. The projection apparatus according to claim 2, wherein the light beam incident on the first lens, the second lens, or the third lens is emitted from the photochromic lens group.

10. The projection apparatus according to claim 9, wherein the group of photochromic lenses includes a plurality of photochromic lenses arranged sequentially along the direction of light beam propagation.

11. A projection apparatus comprising a projection screen, a display device, and a projection lens assembly, The display device has a curved display surface, and the curvature of the curved display surface matches the curvature of the projection surface of the projection screen. The projection lens assembly is provided between the display device and the projection surface of the projection screen, and the projection lens assembly has a light-receiving surface. The curved display surface of the display device is surrounded by a portion of the outer periphery of the light-receiving surface of the projection lens assembly. The projection lens assembly is a projection device that guides a light beam emitted from the curved display surface from a portion of the outer periphery surrounded by the light-receiving surface to another portion of the outer periphery of the light-receiving surface, and projects the light beam onto the projection surface.

12. The display device includes a first display device, a second display device, and a third display device, the first display device, the second display device, and the third display device each output images of different colors. The projection lens assembly includes a first lens, a second lens, and a third lens arranged in order along the circumferential direction. The light-receiving surface of the first lens corresponds to the first display device, The light-receiving surface of the second lens corresponds to the second display device, The projection apparatus according to claim 11, wherein the light-receiving surface of the third lens corresponds to the third display device.

13. The light-receiving surface of the projection lens assembly is provided as an arc-shaped surface that protrudes toward the display surface. The first lens, the second lens, and the third lens are sector-shaped prisms, and the light-receiving surfaces of the first lens, the second lens, and the third lens are all provided as arcuate surfaces. The curvature of the light-receiving surface of the first lens is equal to the curvature of the display surface of the first display device. The curvature of the light-receiving surface of the second lens is equal to the curvature of the display surface of the second display device. The projection apparatus according to claim 12, wherein the curvature of the light-receiving surface of the third lens is equal to the curvature of the display surface of the third display device.

14. The first lens, the second lens, and the third lens are joined together to form at least a part of a cylindrical body, and the projection device is A first film layer provided on the surface between the first lens and the second lens, configured to reflect the light beam output from the first display device and transmit the light beams output from the second display device and the third display device, The projection apparatus according to claim 13, further comprising: a second film layer provided on the surface between the second lens and the third lens, configured to reflect a light beam output from the third display device and transmit light beams output from the first display device and the second display device.

15. The light-receiving surface of the projection lens assembly is planar. The first lens, the second lens, and the third lens are provided in the shape of a triangular prism. The projection apparatus according to claim 12, wherein the light-receiving surfaces of the first lens, the second lens, and the third lens are planar, and thereby the light-receiving surfaces of the projection lens assembly are arranged in a joined multi-planar shape.

16. The first lens, the second lens, and the third lens are joined together to form at least a part of a rectangular prism, and the projection device is A first film layer is provided on the surface between the first lens and the second lens, wherein the first film layer is configured to reflect the light beam output from the first display device and transmit the light beams output from the second display device and the third display device. The projection apparatus according to claim 15, further comprising: a second film layer provided on the surface between the second lens and the third lens, the second film layer configured to reflect a light beam output from the third display device and transmit light beams output from the first display device and the second display device.

17. The first display device and the first lens are spaced apart from each other. The second display device and the second lens are spaced apart from each other. The projection apparatus according to claim 12, wherein the third display device and the third lens are spaced apart from each other.

18. The projection lens assembly further includes a group of photochromic lenses, The first lens, the second lens, the third lens, and the photochromic lens group are arranged in order along the circumferential direction. The projection apparatus according to claim 12, wherein the light beams incident on the first lens, the second lens, and the third lens are emitted from the photochromic lens group.

19. The aforementioned photochromic lens group includes a plurality of photochromic lenses arranged sequentially along the direction of light beam propagation, or The projection apparatus according to claim 18, wherein the photochromic lens group includes an arc-shaped mirror that protrudes in the direction of light beam propagation.

20. A projection system comprising a projection device and a projection screen having a projection surface, The projection device includes a display device and a projection lens assembly. The display device has a curved display surface, and the curvature of the curved display surface matches the curvature of the projection surface. A projection system in which the light-receiving surface of the projection lens assembly is an arc-shaped surface that protrudes toward the curved display surface, and the light beam output from the curved display surface is projected onto the projection surface through the projection lens assembly.

Images