Projection device, projection lens assembly, and projection system

Abstract

The 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 comprises a display device, the display device has a display surface, the display surface is a curved surface, and the curvature of the display surface matches the curvature of a projection surface of a projection screen. The projection device further comprises a projection lens assembly, the light entrance surface of the projection lens assembly is a plane and / or an arc-shaped surface protruding towards the display surface, and the light beam output by the display surface enters the projection lens assembly from the light entrance surface and is then projected to the projection surface through the projection lens assembly. In the manner, the projection effect can be improved.

Description

Technical Field

[0001] This invention relates to the field of projection equipment technology, and in particular to a projection device, a projection lens assembly, and a projection system. Background Technology

[0002] Currently, most projection devices on the market use flat panel displays as the image source. A clear image projected by a flat panel display through a projection lens is a planar image. However, when a projection device is used with a curved projection screen, due to aberrations in the projection lens design, when the image is projected onto the curved screen, a focus deviation occurs between the center and sides of the image. This means that the center and sides of the image on the curved screen cannot be clearly imaged simultaneously, resulting in poor projection quality and a significantly diminished viewing experience for the user. Summary of the Invention

[0003] In view of this, the main technical problem solved by the present invention is to provide a projection device, a projection lens assembly, and a projection system that can improve the projection effect.

[0004] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is to provide a projection device. The projection device includes a display device having a display surface, which is curved, wherein the curvature of the display surface matches the curvature of the projection surface of a projection screen; the projection device also includes a projection lens assembly, the light-incident surface of which is a plane and / or an arcuate surface convex to the display surface, and a light beam output from the display surface enters the projection lens assembly from the light-incident surface and is then projected onto the projection surface via 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, which are capable of outputting images of different colors respectively; the projection lens assembly includes a first lens to a third lens, which are arranged sequentially along a circumferential direction, and each of the first lens to the third lens has a light-incident surface, which are respectively arranged in correspondence with the display surfaces of the first display device to the third display device.

[0006] In one embodiment of the present invention, a first film layer is provided between the first lens and the second lens and on the surface of the third lens away from the second lens. The first film layer is capable of reflecting the light beam output by the first display device and transmitting the light beam output by the second display device and the third display device. A second film layer is provided between the second lens and the third lens and on the surface of the first lens away from the second lens. The second film layer is capable of reflecting the light beam output by the third display device and transmitting the light beam output by the first display device and the second display device.

[0007] In one embodiment of the present invention, 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 convex to the first display device; the second side surface of the second lens is a curved surface convex to the second display device; and the second side surface of the third lens is a curved surface convex to 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 incident surfaces of the first lens to the third lens are all planar.

[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 to form an adjustment gap.

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

[0013] In one embodiment of the present invention, the dimming lens group includes a plurality of dimming lenses arranged sequentially along the beam propagation direction, or the dimming lens group includes a curved mirror that protrudes toward the beam propagation direction.

[0014] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is: to provide a projection lens assembly, which is applied to the projection device described in the above embodiments; the projection lens assembly includes a color combining lens group and a dimming lens group, wherein the light beam integrated by the color combining lens group is incident on the dimming lens group and then exits through the dimming lens group.

[0015] To address the aforementioned technical problems, another technical solution adopted by the present invention is to provide a projection system. This projection system includes a projection device and a projection screen as described in the above embodiments. The projection screen has a projection surface, and the light beam output by the display device of the projection device is projected onto the projection surface through a projection lens assembly.

[0016] The beneficial effects of this invention are as follows: Unlike existing technologies, this invention provides a projection device, a projection lens assembly, and a projection system. The display surface of the display device in this projection device is curved, meaning the clear image projected by the display device through the projection lens assembly is a curved image. Furthermore, when the projection surface of the projection screen is also curved, the curvature of the display surface matches the curvature of the projection surface, ensuring that the curvature of the clear image projected by the display device matches the curvature of the projection surface. This allows the clear image projected by the display device to be displayed as completely as possible on the projection surface. In other words, the center and sides of the projection surface can be clearly focused simultaneously, and the center and sides of the image projected onto the projection surface can be clearly imaged. This results in a clearer image with more consistent overall clarity, improving the projection effect and enhancing the user's viewing experience. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. Furthermore, these drawings and textual descriptions are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the concept of the invention to those skilled in the art by reference to specific embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of a prior art curved surface projection display system;

[0019] Figure 2 This is a schematic diagram of the structure of an embodiment of the projection device of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of an embodiment of the projection system of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of an embodiment of the display device and color combining lens assembly of the present invention;

[0022] Figure 5 This is a schematic diagram of a structural embodiment of the prism of the present invention;

[0023] Figure 6 yes Figure 4 A schematic diagram of the color-combining lens assembly from another perspective;

[0024] Figure 7 yes Figure 4 The diagram shows the optical path of the display device and the color combining lens assembly.

[0025] Figure 8 This is a schematic diagram of the structure of an embodiment of the first display device and the first lens of the present invention;

[0026] Figure 9This is a schematic diagram of another embodiment of the first display device and the first lens of the present invention;

[0027] Figure 10 This is a schematic diagram of another embodiment of the projection device of the present invention;

[0028] Figure 11 This is a schematic diagram of the structure of an embodiment of the projection lens assembly of the present invention;

[0029] Figure 12 This is a schematic diagram of another embodiment of the projection system of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] To address the technical problem of poor image clarity consistency when projected onto a curved projection screen in existing technologies, an embodiment of the present invention provides a projection device. The projection device includes a display device having a display surface that is curved, wherein the curvature of the display surface matches the curvature of the projection surface of the projection screen. The projection device also includes a projection lens assembly, the light-incident surface of which is a plane and / or an arcuate surface convex to the display surface. A light beam output from the display surface enters the projection lens assembly from the light-incident surface and is then projected onto the projection surface. This is described in detail below.

[0032] With the introduction of curved TVs, curved display systems have gained widespread popularity in recent years. Their advantage lies in providing viewers with a sense of immersion and envelopment when viewed on a large screen at close range. However, due to size limitations, most curved TVs are currently under 85 inches, with curved TVs mostly concentrated around 55 inches. This results in a relatively small size for curved TVs, failing to provide viewers with sufficient immersion and envelopment, leading to a decline in their popularity. Large-screen curved projection display systems used in entertainment venues such as cinemas and amusement parks can truly provide viewers with a sense of immersion, making them the best curved display system currently available. As screen sizes continue to increase, curved display systems will remain a viable differentiated display solution.

[0033] For the aforementioned curved projection display system, the projection devices currently used are typically flat-panel display devices. As is well known, the clear image projected by a flat-panel display device through a projection lens is also a flat image. For example... Figure 1 As shown, the clear image A projected by the flat panel display device 11 through the projection lens 12 is a planar image. Due to aberrations in the design of the projection lens, a focus deviation occurs in the center and sides of the image projected onto the curved projection screen, meaning that the center and sides of the image on the curved projection screen cannot be clearly imaged simultaneously. (Continue reading...) Figure 1 The actual image B projected by the flat panel display device 11 onto the curved projection screen 13 is a curved image, in which the center of the actual image B is clearly imaged, while the sides are not clearly imaged. In other words, the flat panel display devices currently used in curved projection display systems result in poor consistency in the clarity of the projected image, which has a negative impact on the user's viewing experience.

[0034] In view of this, one embodiment of the present invention provides a projection device that can improve the clarity consistency of the projected image, that is, improve the projection effect, thereby improving the user's viewing experience.

[0035] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of an embodiment of the projection device of the present invention.

[0036] In one embodiment, the projection device 20 includes a display device 21 and a projection lens assembly, which are disposed opposite to each other. The display device 21 has a display surface 23, which is capable of emitting light and forming an image. The projection lens assembly is used to project the image output from the display surface 23 onto the projection surface of a projection screen. Through the reasonable design of the projection lens assembly, the overall optical performance and light efficiency of the projection device 20 can be improved.

[0037] 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, including brightness, contrast ratio, resolution, and color gamut. The aforementioned LCD, LCOS, DLP, and MEMS display technologies are mainly used in flat panel displays, while OLED and Micro-LED can both be designed as flexible devices to achieve curved displays. Micro-LED display technology boasts high brightness, reaching hundreds of thousands of nits or higher, and allows for higher pixel density designs. Its semiconductor light-emitting diodes can be as small as micrometers, achieving a PPI (Pixels Per Inch) greater than 5000 and a contrast ratio exceeding 100,000:1. Furthermore, Micro-LED display technology offers a wide color gamut, fast response time, and can operate in temperatures ranging from -70℃ to 100℃, resulting in a long lifespan. Therefore, as an embodiment, display device 21 employs Micro-LED display technology.

[0038] Of course, in other embodiments of the present invention, the display device 21 may employ other display technologies besides Micro-LED display technology, such as LCD, LCOS, DLP, MEMS, etc., mentioned above. Furthermore, the display device 21 may be flexible, allowing its display surface 23 to bend into a curved surface through its own bending action; alternatively, the display device 21 may not be flexible, but its display surface 23 may be directly designed as a curved surface.

[0039] Please refer to the following: Figure 3 , Figure 3 This is a schematic diagram of an embodiment of the projection system of the present invention.

[0040] The projection device 20 can be applied to the aforementioned curved projection display system, i.e., the projection screen 30 has a projection surface 31, and the projection surface 31 is curved. Further, the projection surface 31 is concave towards the incident light. In other words, the projection surface 31 is concave along the propagation direction of the received light beam. To match the curved imaging requirements of the projection surface 31, the display surface 23 of the display device 21 in this embodiment is also curved. Since the clear image C projected by the projection lens assembly from the curved display surface 23 is a curved image, the clear image C projected by the display device 21 can be displayed as completely as possible on the curved projection surface 31, such as... Figure 3 As shown. In other words, the center and both sides of the projection surface 31 can be in focus as clearly as possible at the same time, and the center and both sides of the image projected on the projection surface 31 can be imaged as clearly as possible. That is, the image projected on the projection surface 31 is relatively clear and the overall clarity is relatively consistent, which can avoid the phenomenon of defocus or blurry focus as much as possible, thereby improving the projection effect and improving the user's viewing experience.

[0041] Furthermore, the curvature of the display surface 23 matches the curvature of the projection surface 31, meaning that the curvature of the display surface 23 and the curvature of the projection surface 31 are the same or close. This ensures that the curvature of the clear image C projected by the display device 21 matches the curvature of the projection surface 31, further guaranteeing that the clear image C projected by the display device 21 is completely displayed on the projection surface 31. Figure 3 As shown, this further ensures that the center and both sides of the projection surface 31 can be clearly focused at the same time, and further ensures that the center and both sides of the image projected on the projection surface 31 can be imaged as clearly as possible, thereby further improving the consistency of the image clarity projected on the projection surface 31, further improving the projection effect, and further improving the user's viewing experience.

[0042] Please see Figure 2 and Figure 4 , Figure 4 This is a schematic diagram of an embodiment of the display device and color combining lens group of the present invention.

[0043] 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 light beams of different colors. The projection lens assembly includes a color combining lens group 24, which integrates the light beams output by the first display device 211, the second display device 212, and the third display device 213 and projects them onto the projection screen.

[0044] Optionally, the first display device 211, the second display device 212, and the third display device 213 can output three primary color beams. For example, the first display device 211 can output a red beam, the second display device 212 can output a green beam, and the third display device 213 can output a blue beam. The beams output by the first display device 211, the second display device 212, and the third display device 213 are combined by the color combining lens group 24.

[0045] It should be noted that the images output by the first display device 211, the second display device 212, and the third display device 213 differ only in color, and the content of the images output by the three devices is the same.

[0046] 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 three primary color images. The colors of the images output by the first display device 211, the second display device 212 and the third display device 213 can form a satisfactory image after being integrated by the color combining lens group 24. This is not limited here.

[0047] Given that the display surface 23 of the display device 21 in the above embodiments is curved, in this embodiment, the display surfaces 231 of the first display device 211, 232 of the second display device 212, and 233 of the third display device 213 all face the color-combining lens group 24, so that the light beams output by the first display device 211, the second display device 212, and the third display device 213 can be projected onto the projection lens assembly through the color-combining lens group 24. Furthermore, the display surfaces 231 of the first display device 211, 232 of the second display device 212, and 233 of the third display device 213 are all concave in a direction away from the color-combining lens group 24.

[0048] Furthermore, the curvatures of 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 equal. This ensures that the beams output from the first display device 211, the second display device 212, and the third display device 213 have good consistency after being integrated by the color combining lens group 24, further improving the projection effect.

[0049] Please continue reading. Figure 2 , Figure 4 and Figure 5 , Figure 5 This is a schematic diagram of a prism embodiment of the present invention.

[0050] In one embodiment, the color-combining 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 prisms 40. The side surfaces of the prism 40 include a first side surface 42, a light-incident surface 43, and a second side surface 44 connected in sequence. The edges of the first side surface 42 and the second side surface 44 away from the light-incident surface 43 are connected, and the edge connecting the first side surface 42 and the second side surface 44 is their common edge, which is the target edge 41. Figure 5 As shown.

[0051] like Figure 4 As shown, the first lens 241, the second lens 242, and the third lens 243 are aligned along a circumferential direction (e.g., ...). Figure 4 (As shown by the dashed arrow in the middle, the same below) are arranged sequentially. Furthermore, the target edges 411 of the first lens 241, 412 of the second lens 242, and 413 of the third lens 243 abut together, such that the target edges 411 of the first lens 241, 412 of the second lens 242, and 413 of the third lens 243 coincide. For example, taking the first and second side surfaces of the aforementioned prism arranged sequentially along the circumferential direction, the second side surface 441 of the first lens 241 and the first side surface 422 of the second lens 242 are close to each other, and the second side surface 442 of the second lens 242 and the first side surface 423 of the third lens 243 are close to each other.

[0052] Furthermore, the first lens 241, the second lens 242, and the third lens 243 have the same height, and their top surfaces and bottom surfaces are on the same plane, as shown below. Figure 6 As shown. Figure 4 It shows Figure 6 The top-view perspective of the color-combining lens group shown.

[0053] Please continue reading. Figure 4 Each of the first lens 241 to the third lens 243 has a light-incident surface, and the light-incident surfaces of the first lens 241 to the third lens 243 are respectively set to correspond one-to-one with the display surfaces of the first display device 211 to the third display device 213.

[0054] Specifically, the display surface 231 of the first display device 211 faces the light-incident surface 431 of the first lens 241, so that the light beam output by the first display device 211 enters the first lens 241 through the light-incident surface 431; the display surface 232 of the second display device 212 faces the light-incident surface 432 of the second lens 242, so that the light beam output by the second display device 212 enters the second lens 242 through the light-incident surface 432; and the display surface 233 of the third display device 213 faces the light-incident surface 433 of the third lens 243, so that the light beam output by the third display device 213 enters the third lens 243 through the light-incident surface 433.

[0055] 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 facing 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. This allows the light beam output from the first display device 211 to be reflected by the first film layer 245 after entering the first lens 241, and then propagate towards the side of the first lens 241 and the third lens 243 facing away from the second lens 242, exiting from the same side. Figure 7 As shown; the light beam output from the second display device 212, after being incident on the second lens 242, passes through the first film layer 245 and exits from the side of the first lens 241 and the third lens 243 away from the second lens 242, as shown. Figure 7 As shown.

[0056] 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 facing away from the second lens 242. The second film layer 246 can reflect the light beam output from the third display device 213 and can transmit the light beams output from the first display device 211 and the second display device 212. This allows the light beam output from the third display device 213 to be reflected by the second film layer 246 after it enters the third lens 243, and then propagate towards the side of the first lens 241 and the third lens 243 facing away from the second lens 242, exiting from the side of the first lens 241 and the third lens 243 facing away from the second lens 242. Figure 7 As shown; the light beam output from the second display device 212, after entering the second lens 242, passes through the second lens 242 and through the second film layer 246, and exits from the side of the first lens 241 and the third lens 243 away from the second lens 242, as shown. Figure 7 As shown.

[0057] Please continue reading. Figure 7The reason why the first film layer 245 transmits the light beam output by the third display device 213 is as follows: First, it is to allow the light beam output by the third display device 213 to pass through the first film layer 245 and reach the second film layer 246. Specifically, it is to allow the light beam output by the third display device 213 to pass through the first film layer 245 on the surface of the third lens 243 away from the second lens 242. Second, it is to allow the light beam output by the third display device 213 to be reflected by the second film layer 246 and then pass through the first film layer 245 to reach the side of the first lens 241 and the third lens 243 away from the second lens 242 and exit. Specifically, the light beam output by the third display device 213 is reflected by the second film layer 246 between the second lens 242 and the third lens 243 and then passes through the first film layer 245 on the surface of the third lens 243 away from the second lens 242.

[0058] The reason why the second film layer 246 transmits the light beam output by the first display device 211 is as follows: First, it is to allow the light beam output by the first display device 211 to pass through the second film layer 246 and reach the first film layer 245. Specifically, it is to allow the light beam output by the first display device 211 to pass through the second film layer 246 on the surface of the first lens 241 away from the second lens 242. Second, it is to allow the light beam output by the first display device 211 to be reflected by the first film layer 245 and then pass through the second film layer 246 to reach the side of the first lens 241 and the third lens 243 away from the second lens 242 and exit. Specifically, the light beam output by the first display device 211 to be reflected by the first 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 away from the second lens 242.

[0059] In the above manner, the light emitted from the first display device 211, the second display device 212, and the third display device 213 is incident on the first lens 241, the second lens 242, and the third lens 243, and then passes through the first lens 241 to the third lens 243. The light then converges on the side of the first lens 241 and the third lens 243 away from the second lens 242, so that the light emitted from the first display device 211, the second display device 212, and the third display device 213 is integrated together and projected onto the projection screen.

[0060] Based on the example described above, where 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 allow green and blue light to pass through, and the second film layer 246 can reflect blue light and allow red and green light to pass through.

[0061] Optionally, the first film layer 245 can be a red light reflective film, which reflects red light and allows green and blue light to pass through; the second film layer 246 can be a blue light reflective film, which reflects blue light and allows red and green light to pass through. The specific material composition of the red and blue light reflective films is within the understanding of those skilled in the art and will not be elaborated upon here.

[0062] Please continue reading. Figure 4 In one embodiment, the light-incident surface 431 of the first lens 241 is a curved surface convex to the first display device 211, such that the light-incident surface 431 of the first lens 241 matches the curvature of the display surface 231 of the first display device 211 as closely as possible.

[0063] The curvature of the light-incident surface 431 of the first lens 241 matches the curvature of the display surface 231 of the first display device 211, meaning that the curvature of the light-incident 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. For example, such as Figure 8 As shown, the curvature of the light-incident 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 beams output from various positions on the display surface 231 of the first display device 211 are transmitted to the light-incident surface 431 of the first lens 241, the light beams output from the display surface 231 are perpendicular to the tangent plane P at the location of the incident point O on the light-incident surface 431 and are incident into the first lens 241 (that is, the light beams output from the display surface 231 propagate along the theoretical light path). This avoids reflection and refraction of the light beam when it enters the first lens 241 as much as possible, so as to avoid the loss of light intensity and the deviation of the actual light path of the light beam from the theoretical light path, which is beneficial to improving the projection effect.

[0064] Similarly, the light-incident surface 432 of the second lens 242 is a curved surface convex to the second display device 212, so that the light-incident surface 432 of the second lens 242 matches the curvature of the display surface 232 of the second display device 212 as much as possible, so as to avoid the reflection and refraction of the light beam output by the second display device 212 when it enters the second lens 242, which further helps to improve the projection effect.

[0065] Similarly, the light-incident surface 433 of the third lens 243 is a curved surface convex to the third display device 213, so that the light-incident surface 433 of the third lens 243 matches the curvature of the display surface 233 of the third display device 213 as much as possible, so as to avoid the reflection and refraction of the light beam output by the third display device 213 when it enters the third lens 243, which further helps to improve the projection effect.

[0066] Furthermore, the curvature of the incident 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 can be ensured to the greatest extent that the light beam output by the first display device 211 is incident on the first lens 241 along the normal, and the reflection and refraction of the light beam output by the first display device 211 when entering the first lens 241 can be avoided to the greatest extent, which is conducive to improving the projection effect.

[0067] The curvature of the incident 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 can be ensured to the greatest extent that the light beam output by the second display device 212 is incident on the second lens 242 along the normal, and the reflection and refraction of the light beam output by the second display device 212 when entering the second lens 242 can be avoided to the greatest extent, which is conducive to improving the projection effect.

[0068] The curvature of the incident 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 can be ensured to the greatest extent that the light beam output by the third display device 213 is incident on the third lens 243 along the normal, and the reflection and refraction of the light beam output by the third display device 213 when entering the third lens 243 can be avoided to the greatest extent, which is conducive to improving the projection effect.

[0069] In the above embodiments, the curvatures of 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 equal. In this embodiment, the curvatures of the light-incident surface 431 of the first lens 241, the light-incident surface 432 of the second lens 242, and the light-incident surface 433 of the third lens 243 are also equal.

[0070] In an alternative embodiment, the light-incident surface of the projection lens assembly can also be planar, that is, the light-incident surfaces of the first lens 241 to the third lens 243 are planar. Specifically, the light-incident surface 431 of the first lens 241 is planar, the light-incident surface 432 of the second lens 242 is planar, and the light-incident surface 433 of the third lens 243 is planar. Taking the light-incident surface 431 of the first lens 241 as a planar surface as an example, such as... Figure 9 As shown.

[0071] It should be noted that the display surface of the display device in this embodiment of the invention is designed as a curved surface (e.g., Figure 9 The first display device 211 has a curved display surface 231, and its curvature matches the curvature of the projection surface of the projection screen. This can improve the consistency of the projection image clarity to a certain extent and help ensure that different parts of the projection image are in focus at the same time. It can be seen that the design of the light-incident surface of the projection lens assembly is also in line with the design concept of the present invention.

[0072] Of course, in other embodiments of the present invention, the light-incident surface of the projection lens assembly may be partially curved and partially planar. Specifically, the light-incident surfaces of some lenses in the first lens 241 to the third lens 243 are curved and the light-incident surfaces of some lenses are planar, which is not limited here.

[0073] In one embodiment, the first display device 211 is located between the plane containing the first side surface 421 of the first lens 241 and the plane containing the second side surface 441 of the first lens 241. In other words, the first display device 211 is located between the extended plane of the first side surface 421 of the first lens 241 and the extended plane of the second side surface 441 of the first lens 241. This ensures that the light beam output by the first display device 211 can be incident on the first lens 241, further improving the projection effect.

[0074] The second display device 212 is located between the plane containing the first side surface 422 of the second lens 242 and the plane containing the second side surface 442 of the second lens 242. In other words, the second display device 212 is located between the extended plane of the first side surface 422 of the second lens 242 and the extended plane of the second side surface 442 of the second lens 242. In this way, the light beam output by the second display device 212 can be incident on the second lens 242, which further helps to improve the projection effect.

[0075] The third display device 213 is located between the plane containing the first side surface 423 of the third lens 243 and the plane containing the second side surface 443 of the third lens 243. In other words, the third display device 213 is located between the extended plane of the first side surface 423 of the third lens 243 and the extended plane of the second side surface 443 of the third lens 243. In this way, the light beam output by the third display device 213 can be incident on the third lens 243, which further helps to improve the projection effect.

[0076] Please continue reading. Figure 4 In one embodiment, the first display device 211 and the first lens 241 are spaced apart, the second display device 212 and the second lens 242 are spaced apart, and the third display device 213 and the third lens 243 are spaced apart, forming an adjustable gap D. This spacing between the display devices and their corresponding lenses allows for more flexible adjustment of their relative positions, avoiding the precision requirements of a design where the display devices and lenses are directly attached. This facilitates the assembly and manufacturing process of the projection device. For example, the adjustable gap D affects the design of the back focal length (BFD) of the projection system. The size of the adjustable gap D can be adjusted according to the product's requirements for the back focal length, ensuring that the back focal length of the projection system meets the requirements.

[0077] Please continue reading. Figure 2 , Figure 4 and Figure 6 In one embodiment, the projection lens assembly further includes a dimming lens group 25. The light beam integrated by the color combining lens group 24 is incident on the dimming lens group 25 and then exits through the dimming lens group 25. The first lens 241 to the third lens 243 and the dimming lens group 25 are arranged sequentially along the aforementioned circumferential direction, and the light beams incident on the first lens 241 to the third lens 243 all exit from the dimming lens group 25.

[0078] In one embodiment, the dimming lens group 25 includes a curved mirror that bulges towards the direction of light beam propagation. Specifically, the dimming lens group 25 includes a fourth lens 251, which is the curved mirror. The first lens 241, the second lens 242, the third lens 243, and the fourth lens 251 are arranged sequentially along the aforementioned circumferential direction. The fourth lens 251 is also a prism, 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 coincide.

[0079] In another embodiment, the fourth lens 251 can be a curved mirror with a sheet-like structure that protrudes in the direction of light emission. In this case, there is a light mixing space between the fourth lens 251 and the first lens 241 to the third lens 243. After the light is emitted from the first lens 241 to the third lens 243, it passes through the light mixing space and enters the fourth lens 251.

[0080] For example, taking the first and second side surfaces of the aforementioned prism as arranged sequentially along the circumferential direction, the second side surface 444 of the fourth lens 251 and the first side surface 421 of the first lens 241 are close to each other, and the first side surface 424 of the fourth lens 251 and the second side surface 443 of the third lens 243 are close to each other, as shown. Figure 4 As shown. Furthermore, the first lens 241, the second lens 242, the third lens 243, and the fourth lens 251 have the same height; their top surfaces and bottom surfaces are on the same plane, as shown. Figure 6 As shown.

[0081] The fourth lens 251 is located on the side of the first lens 241 and the third lens 243 opposite to 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 is used to integrate the light beams output by the first display device 211, the second display device 212, and the third display device 213 and project them onto the projection lens assembly. That is, the light beams projected by the first display device 211 through the first lens 241, the light beams projected by the second display device 212 through the second lens 242, and the light beams projected by the third display device 213 through the third lens 243 converge at the fourth lens 251, so that the light beams output by the first display device 211, the second display device 212, and the third display device 213 are integrated together.

[0082] like Figure 7 As shown, the light beam output by the first display device 211 is incident on the first lens 241, reflected by the first film layer 245, then enters the fourth lens 251, and finally exits from the fourth lens 251. The light beam output by the second display device 212 is incident on 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 finally exits from the fourth lens 251. The light beam output by the third display device 213 is incident on the third lens 243, reflected by the second film layer 246, then enters the fourth lens 251, and finally exits from the fourth lens 251.

[0083] The fourth lens 251 participates in the design of the back focal length of the projection device 20. The material selection of the fourth lens 251 and the curvature of its light-incident surface 434 both affect the overall back focal length of the projection device 20. In this embodiment, the curvature of the light-incident surface 434 of the fourth lens 251 can differ from that of the first lens 241, the second lens 242, and the third lens 243. The curvature of the light-incident surface 434 of the fourth lens 251 can match the overall optical system design of the projection device 20. For example, if the curvature of the light-incident surface 434 of the fourth lens 251 matches the focal length design of the projection lens assembly, the light utilization rate and light efficiency of the entire optical system can be higher. Other lenses can also be added between the fourth lens 251 and the projection lens assembly to further improve the light utilization rate and light efficiency of the entire optical system; this is not limited here.

[0084] Of course, in other embodiments of the present invention, the curvature of the light-incident surface 434 of the fourth lens 251 may also be the same as that of the first lens 241, the second lens 242, and the third lens 243. In particular, in the above embodiments where the curvatures of the light-incident surface 431 of the first lens 241, the second lens 242, and the third lens 243 are equal, the cross-sections of the first lens 241, the second lens 242, the third lens 243, and the fourth lens 251 along their respective height directions are all fan-shaped, and the first lens 241, the second lens 242, the third lens 243, and the fourth lens 251 form a complete cylinder. Furthermore, the projection lens assembly of the embodiments of the present invention may not include the fourth lens 251, but may only include the first lens 241, the second lens 242, and the third lens 243 described in the above embodiments.

[0085] In an alternative embodiment, please refer to Figure 10 The difference from the above embodiments is that the dimming lens group 25 in this embodiment can be a plurality of dimming lenses, which are arranged sequentially along the beam propagation direction. Specifically, the plurality of dimming lenses includes a fifth lens 252 and a sixth lens 253, which are arranged sequentially along the beam propagation direction.

[0086] The light beam output from the first display device 211 to the first lens 241 is transmitted to the fifth lens 252; the light beam output from the second display device 212 to the second lens 242 is transmitted to the fifth lens 252; and the light beam output from the third display device 213 to the third lens 243 is transmitted to the fifth lens 252. Furthermore, the light beams transmitted from the first display device 211 to the third display device 213 to the fifth lens 252 are combined at the fifth lens 252, and the combined light beam is transmitted to the sixth lens 253, which then projects the beam onto the projection screen.

[0087] Through the above-described design, the fifth lens 252 and the sixth lens 253 can further improve the light utilization rate and light efficiency of the entire projection system. Of course, the dimming lenses included in the dimming 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.

[0088] In summary, the projection device provided by this invention has a curved display surface, meaning the clear image projected by the display device through the projection lens assembly is a curved image. Furthermore, when the projection screen's projection surface is also curved, the curvature of the display surface matches the curvature of the projection surface, ensuring that the curvature of the clear image projected by the display device matches the curvature of the projection surface. This allows the clear image projected by the display device to be displayed as completely as possible on the projection surface. In other words, the center and sides of the projection surface can be clearly focused simultaneously, and the center and sides of the image projected onto the projection surface can be clearly imaged. This results in a clearer image with more consistent overall clarity, improving the projection effect and enhancing the user's viewing experience.

[0089] Please see Figure 11 , Figure 11 This is a schematic diagram of the structure of an embodiment of the projection lens assembly of the present invention.

[0090] In one embodiment, the projection lens assembly is used in the projection device described in the above embodiments. The projection lens assembly includes a color combining lens group 24 and a dimming lens group 25. The light beam integrated by the color combining lens group 24 is incident on the dimming lens group 25 and then exits through the dimming lens group 25. The projection lens assembly has been described in detail in the above embodiments and will not be repeated here.

[0091] Please see Figure 12 , Figure 12 This is a schematic diagram of another embodiment of the projection system of the present invention.

[0092] In one embodiment, the projection system includes a projection device 20 and a projection screen 30. The projection device 20 can 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 through a projection lens assembly.

[0093] Furthermore, in this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," "stacked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A projection device, characterized by The display device has a display surface, which is a curved surface, wherein the curvature of the display surface is equal to the curvature of a projection surface of a projection screen; the projection surface of the projection screen is a curved surface, and the projection surface is concave to incident light; The light entrance surface of the projection lens assembly is an arc surface convex to the display surface, and the curvature of the light entrance surface is equal to the curvature of the display surface; the light beams output by the display surface enter the projection lens assembly from the light entrance surface and then are projected to the projection surface through the projection lens assembly.

2. The projection device according to claim 1, wherein The display device comprises first to third display devices, which respectively output images of different colors; The projection lens assembly comprises first to third lenses, which are arranged in sequence along the circumferential direction; the first to third lenses each have a light entrance surface, and the light entrance surfaces of the first to third lenses are arranged in one-to-one correspondence with the display surfaces of the first to third display devices, respectively.

3. The projection device according to claim 2, wherein A first film layer is arranged between the first lens and the second lens and on the surface of the third lens away from the second lens, the first film layer can reflect the light beams output by the first display device and can transmit the light beams output by the second display device and the third display device; A second film layer is arranged between the second lens and the third lens and on the surface of the first lens away from the second lens, the second film layer can reflect the light beams output by the third display device and can transmit the light beams output by the first display device and the second display device. The curvatures of the display surfaces of the first to third display devices are equal.

4. The projection apparatus according to claim 2, wherein 5. The projection device according to claim 2, wherein The light entrance surface of the first lens is a curved surface convex to the first display device; The light entrance surface of the second lens is a curved surface convex to the second display device; The light entrance surface of the third lens is a curved surface convex to the third display device.

6. The projection device according to claim 2, wherein The curvature of the light entrance surface of the first lens is equal to the curvature of the display surface of the first display device; The curvature of the light entrance surface of the second lens is equal to the curvature of the display surface of the second display device; The curvature of the light entrance surface of the third lens is equal to the curvature of the display surface of the third display device. The light entrance surfaces of the first to third lenses are all planar surfaces.

7. The projection apparatus according to claim 2, wherein The first display device and the first lens are spaced from each other, the second display device and the second lens are spaced from each other, and the third display device and the third lens are spaced from each other, so as to form an adjustment gap.

8. The projection apparatus according to claim 2, wherein 9. The projection device according to any one of claims 2-8, wherein ​ The projection lens assembly further comprises a light adjusting lens group, the first lens to the third lens and the light adjusting lens group are arranged in sequence along a circumferential direction, and light beams incident to the first lens to the third lens are all emitted from the light adjusting lens group.

10. The projection apparatus according to claim 9, wherein, The light adjusting lens group comprises a plurality of light adjusting lenses arranged in sequence along a light beam propagation direction, or the light adjusting lens group comprises an arc mirror protruding towards the light beam propagation direction.

11. A projection lens assembly, characterized by, The projection lens assembly comprises the projection device according to any one of claims 1 to 10; The projection lens assembly comprises a color combining lens group and a light adjusting lens group, light beams after being combined by the color combining lens group are incident to the light adjusting lens group, and then are emitted by the light adjusting lens group.

12. A projection system, characterized by The projection device according to any one of claims 1 to 10 and a projection screen are comprised, the projection screen has a projection surface, and light beams output by a display device of the projection device are projected to the projection surface through a projection lens assembly.

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