Optical structure and projection device

Abstract

An optical structure (01) and a projection device. The optical structure (01) comprises a display assembly (200), wherein the display assembly comprises a first lens (201), a display panel (202), a second lens (203), and a reflective mirror (204) which are sequentially arranged in a first direction (X). The optical structure (01) further comprises a fan (205), a first air duct wall (CV1), and a second air duct wall (CV2); the first air duct wall (CV1) comprises a first connection portion (310); the second air duct wall (CV2) comprises a second connection portion (410); one end of the first connection portion (310) extends to a contour edge (2011) of the first lens (201); one end of the second connection portion (410) extends to a contour edge (2012) of the display panel (202); the minimum distance between the first connection portion (310) and the second connection portion (410) in a second direction (Z) is a first distance Amm; the minimum distance between the second lens (203) and the second connection portion (410) in the second direction (Z) is a second distance Cmm; the minimum distance between the first lens (201) and the display panel (202) in the first direction (X) is Mmm; and the minimum distance between the display panel (202) and the second lens (203) in the first direction (X) is Nmm, wherein 0.3×M≤A≤12, and 4.2≤C≤N. Therefore, a fan structure has a good heat dissipation effect.

Description

Optical structure and projection device TECHNICAL FIELD

[0001] At least one embodiment of the present disclosure provides an optical structure and a projection device. BACKGROUND

[0002] At present, the projection devices on the market mainly include CRT (Cathode Ray Tube) projection devices, LCD (Liquid Crystal Display) projection devices, and DLP (Digital Light Processing) projection devices. The LCD projection devices mainly include single-LCD projection devices, three-LCD projection devices, and the like.

[0003] The projection device can project images or videos onto a screen, and is connected with computers, game consoles, televisions, and the like through different interfaces to play corresponding video signals. The projection device is widely used in families, offices, schools, and entertainment places. For example, the single-LCD projection device has simple structure and low cost, and is suitable for popularization to the middle and low consumption groups, and thus has considerable development prospect.

[0004] SUMMARY

[0005] At least one embodiment of the present disclosure provides an optical structure having a light source assembly and a display assembly, wherein the display assembly is located on the light-out side of the light source assembly, the display assembly comprises a first lens, a display panel, a second lens and a mirror arranged in sequence along a first direction, the first lens is closer to the light source assembly than the display panel, the optical structure further comprises a fan, a first air duct wall and a second air duct wall, in a second direction, the fan and the first air duct wall are respectively located on opposite sides of the display assembly, and the second air duct wall is located on the side of the display assembly close to the first air duct wall, the first direction is different from the second direction, the first air duct wall comprises a first connecting portion, one end of the first connecting portion extends to the contour edge of the first lens, the second air duct wall comprises a second connecting portion, one end of the second connecting portion extends to the contour edge of the display panel, the orthographic projection of the first connecting portion on a first plane and the orthographic projection of the second connecting portion on the first plane both overlap with the orthographic projection of the second lens on the first plane, the first plane is a plane perpendicular to the second direction, the minimum distance between the first connecting portion and the second connecting portion in the second direction is a first distance A mm, the minimum distance between the second lens and the second connecting portion in the second direction is a second distance C mm, the minimum distance between the first lens and the display panel in the first direction is M mm, the minimum distance between the display panel and the second lens in the first direction is N mm, 0.3 x M ≤ A ≤ 12, 4.2 ≤ C ≤ N.

[0006] For example, the optical structure provided by at least one embodiment of the present disclosure, 0.62 x M ≤ A ≤ 12, 4.2 ≤ C ≤ 0.804 x N.

[0007] For example, the optical structure provided by at least one embodiment of the present disclosure, the first distance A and the second distance C satisfy: 15.5 ≤ A + C ≤ 16.5.

[0008] For example, the optical structure provided by at least one embodiment of the present disclosure, the first distance A satisfies: 7.0 ≤ A ≤ 10.0.

[0009] For example, the optical structure provided by at least one embodiment of the present disclosure, the first air duct wall further comprises a first extension part, the first extension part is located on the side of the reflector away from the fan, and at least part of the first extension part is parallel to the first plane, the orthographic projection of the first extension part on the first plane at least partially overlaps the orthographic projection of the reflector on the first plane, the second cover plate further comprises a second extension part, the second extension part is located on the side of the reflector away from the fan, and at least part of the second extension part is parallel to the first plane, the orthographic projection of the second extension part on the first plane at least partially overlaps the orthographic projection of the reflector on the first plane; in the second direction, the minimum distance between the first extension part and the second extension part is B millimeters, wherein B > A, and / or B > C.

[0010] For example, the optical structure provided by at least one embodiment of the present disclosure, the minimum distance B between the first extension part and the second extension part satisfies: 9.0 ≤ B ≤ 13.0.

[0011] For example, the optical structure provided by at least one embodiment of the present disclosure, the first air duct wall further comprises a first inclined part, the first extension part is connected with the first connecting part through the first inclined part, the first inclined part comprises opposite first and second ends, the first end is connected with the first connecting part, the second end is connected with the first extension part, the first end is farther away from the fan than the second end, the second air duct wall further comprises a second inclined part, the second extension part is connected with the second connecting part through the second inclined part, the second inclined part comprises opposite third and fourth ends, the third end is connected with the second connecting part, the fourth end is connected with the second extension part, the third end is farther away from the fan than the fourth end, the angle between the first inclined part and the first plane is a first included angle, the angle between the second inclined part and the first plane is a second included angle, the ratio of the second included angle to the first included angle is 1.5-3.

[0012] For example, the optical structure provided by at least one embodiment of the present disclosure, the first included angle ranges from 20 degrees to 30 degrees; and / or the second included angle ranges from 40 degrees to 50 degrees.

[0013] For example, the optical structure provided by at least one embodiment of the present disclosure includes a first connecting portion and a second connecting portion, the first connecting portion is connected with the second connecting portion, and the second connecting portion is farther away from the first lens than the first connecting portion, a surface of the first connecting portion facing the second lens is in a first arc shape; and / or the second connecting portion includes a third connecting portion and a fourth connecting portion, the third connecting portion is connected with the fourth connecting portion, and the fourth connecting portion is farther away from the display panel than the third connecting portion, a surface of the third connecting portion facing the second lens is in a second arc shape.

[0014] For example, the optical structure provided by at least one embodiment of the present disclosure includes a first connecting portion and a second connecting portion, the first connecting portion is connected with the second connecting portion, and the second connecting portion is farther away from the first lens than the first connecting portion, a surface of the first connecting portion facing the second lens is in a first arc shape; and / or the second connecting portion includes a third connecting portion and a fourth connecting portion, the third connecting portion is connected with the fourth connecting portion, and the fourth connecting portion is farther away from the display panel than the third connecting portion, a surface of the third connecting portion facing the second lens is in a second arc shape.

[0015] For example, the optical structure provided by at least one embodiment of the present disclosure includes a first connecting portion and a second connecting portion, the first connecting portion is connected with the second connecting portion, and the second connecting portion is farther away from the first lens than the first connecting portion, a surface of the first connecting portion facing the second lens is in a first arc shape; and / or the second connecting portion includes a third connecting portion and a fourth connecting portion, the third connecting portion is connected with the fourth connecting portion, and the fourth connecting portion is farther away from the display panel than the third connecting portion, a surface of the third connecting portion facing the second lens is in a second arc shape.

[0016] For example, the optical structure provided by at least one embodiment of the present disclosure includes a first connecting portion and a second connecting portion, the first connecting portion is connected with the second connecting portion, and the second connecting portion is farther away from the first lens than the first connecting portion, a surface of the first connecting portion facing the second lens is in a first arc shape; and / or the second connecting portion includes a third connecting portion and a fourth connecting portion, the third connecting portion is connected with the fourth connecting portion, and the fourth connecting portion is farther away from the display panel than the third connecting portion, a surface of the third connecting portion facing the second lens is in a second arc shape.

[0017] For example, the optical structure provided by at least one embodiment of the present disclosure includes a first connecting portion and a second connecting portion, the first connecting portion is connected with the second connecting portion, and the second connecting portion is farther away from the first lens than the first connecting portion, a surface of the first connecting portion facing the second lens is in a first arc shape; and / or the second connecting portion includes a third connecting portion and a fourth connecting portion, the third connecting portion is connected with the fourth connecting portion, and the fourth connecting portion is farther away from the display panel than the third connecting portion, a surface of the third connecting portion facing the second lens is in a second arc shape.

[0018] For example, the optical structure provided by at least one embodiment of the present disclosure includes a first connecting portion and a second connecting portion, the first connecting portion is connected with the second connecting portion, and the second connecting portion is farther away from the first lens than the first connecting portion, a surface of the first connecting portion facing the second lens is in a first arc shape; and / or the second connecting portion includes a third connecting portion and a fourth connecting portion, the third connecting portion is connected with the fourth connecting portion, and the fourth connecting portion is farther away from the display panel than the third connecting portion, a surface of the third connecting portion facing the second lens is in a second arc shape.

[0019] For example, the optical structure provided by at least one embodiment of the present disclosure further comprises a heat dissipation element located in the second cavity, wherein the area of the orthographic projection of the at least one second opening on the first plane is greater than the area of the orthographic projection of the heat dissipation element on the first plane.

[0020] For example, the optical structure provided by at least one embodiment of the present disclosure comprises a greater number of first openings than second openings.

[0021] For example, the optical structure provided by at least one embodiment of the present disclosure comprises a greater number of first openings than second openings.

[0022] For example, the optical structure provided by at least one embodiment of the present disclosure, the connecting piece of the second air duct wall comprises a first edge close to the second opening, the second inclined part of the second air duct wall comprises a second edge close to the second opening, the extension direction of the first edge intersects the extension direction of the second edge, and the included angle between the extension direction of the first edge and the extension direction of the second edge is an acute angle, and the at least one first opening in the first extension piece is arranged along the first edge.

[0023] For example, the optical structure provided by at least one embodiment of the present disclosure, the first extension piece has a plurality of first openings arranged at intervals along the first edge; and / or, the second extension piece has one second opening, the first edge serving as at least part of the edge of the second opening close to the first extension piece, the maximum dimension of the second opening in the extension direction of the first edge being a first dimension, and the maximum dimension of the second opening perpendicular to the extension direction of the first edge being a second dimension, the first dimension being greater than the second dimension.

[0024] For example, the optical structure provided by at least one embodiment of the present disclosure, the first lens and the second lens have a flow passage therebetween, the size of the flow passage in the first direction being smaller than the size of the fan in the second direction.

[0025] For example, the optical structure provided by at least one embodiment of the present disclosure further comprises a heat insulation element between the first lens and the display panel, wherein, in the first direction, the distance between the first lens and the heat insulation element is M1, the distance between the heat insulation element and the display panel is M2, the distance between the display panel and the second lens is N, and the size of the fan in the second direction is F, and M1+M2+N<F.

[0026] For example, the optical structure provided by at least one embodiment of the present disclosure further comprises a side cover part on the side of the reflector away from the display panel, the side cover part comprising a side wall and a plurality of first heat dissipation structures and a plurality of second heat dissipation structures connected to the side wall, the reflector and the second lens having a first cavity therebetween, the side of the reflector away from the first cavity having a second cavity, the plurality of first heat dissipation structures being located in the second cavity, the plurality of second heat dissipation structures being located on the side of the side wall away from the second cavity, and the plurality of first heat dissipation structures being adjacent to and spaced apart from the reflector.

[0027] For example, the optical structure provided by at least one embodiment of the present disclosure has an integrated structure.

[0028] For example, the optical structure provided by at least one embodiment of the present disclosure has a distance of 2-3 mm between the first heat dissipation structure and the reflector.

[0029] For example, the optical structure provided by at least one embodiment of the present disclosure has a plurality of first heat dissipation structures with different heights.

[0030] For example, the optical structure provided by at least one embodiment of the present disclosure comprises a plurality of first heat dissipation columns arranged in multiple rows and multiple columns, or a plurality of first heat dissipation strips arranged at intervals; and / or the plurality of second heat dissipation structures comprises a plurality of second heat dissipation columns arranged in multiple rows and multiple columns, or a plurality of second heat dissipation strips arranged at intervals.

[0031] For example, according to at least one embodiment of the present disclosure, the optical structure provided by the present disclosure, the plurality of first heat dissipation structures includes a plurality of first heat dissipation columns arranged in multiple rows and multiple columns, the plurality of first heat dissipation columns includes an Nth row of first heat dissipation columns and an N+1th row of first heat dissipation columns, the Nth row of first heat dissipation columns and the N+1th row of first heat dissipation columns are arranged in staggered manner in the row direction, N is a positive integer greater than or equal to 1; and / or the plurality of first heat dissipation columns includes an Mth column of first heat dissipation columns and an M+1th column of first heat dissipation columns, the Mth column of first heat dissipation columns and the M+1th column of first heat dissipation columns are arranged in staggered manner in the column direction, M is a positive integer greater than or equal to 1.

[0032] For example, according to at least one embodiment of the present disclosure, the optical structure provided by the present disclosure, the plurality of first heat dissipation structures includes a plurality of first heat dissipation strips arranged in a spaced manner and a connecting structure, adjacent first heat dissipation strips are connected by the connecting structure.

[0033] For example, according to at least one embodiment of the present disclosure, the optical structure provided by the present disclosure, the plurality of first heat dissipation strips includes adjacent first heat dissipation strip parts and second heat dissipation strip parts, the first heat dissipation strip parts include first opening parts, the second heat dissipation strip parts include second opening parts, the connecting structure is inserted into the first opening parts and the second opening parts to connect the first heat dissipation strip parts and the second heat dissipation strip parts.

[0034] For example, according to at least one embodiment of the present disclosure, the optical structure provided by the present disclosure, the minimum distance between the connecting structure and the end of the side wall away from the first heat dissipation strip is 10mm-20mm.

[0035] For example, according to at least one embodiment of the present disclosure, the optical structure provided by the present disclosure, the connecting structure includes a plurality of connecting blocks, the plurality of connecting blocks are arranged in a spaced manner along the arrangement direction of the plurality of first heat dissipation strips, and the connecting blocks are located between adjacent first heat dissipation strips.

[0036] For example, according to at least one embodiment of the present disclosure, the optical structure provided by the present disclosure, the included angle between the first heat dissipation strip and the side wall is 85°-90°.

[0037] At least one embodiment of the present disclosure also provides a projection device, which includes the optical structure provided by the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present disclosure, but not limit the present disclosure.

[0039] FIG. 1 is a schematic diagram of an overall structure of an optical structure according to at least one embodiment of the present disclosure.

[0040] FIG. 2 is another schematic diagram of an overall structure of an optical structure according to at least one embodiment of the present disclosure.

[0041] FIG. 3 is a top view of an optical structure according to at least one embodiment of the present disclosure.

[0042] FIG. 4 is a schematic diagram of a cross-sectional view of the optical structure of FIG. 3 along line A-A.

[0043] FIG. 5 is a schematic diagram of a cross-sectional structure of an optical structure according to at least one embodiment of the present disclosure.

[0044] FIG. 6 is a schematic diagram of a cross-sectional structure of an optical structure according to at least one embodiment of the present disclosure.

[0045] FIGS. 7A-16B are cloud diagrams of simulation analysis results for optical structures according to embodiments of the present disclosure.

[0046] FIG. 17 is a schematic diagram of temperature distribution corresponding to the optical structures of FIGS. 7A-16B.

[0047] FIG. 18 is a schematic diagram of velocity distribution corresponding to the optical structures of FIGS. 7A-16B.

[0048] FIG. 19 is a schematic diagram of an internal structure of an optical structure according to at least one embodiment of the present disclosure.

[0049] FIG. 20 is a front view of an optical structure according to at least one embodiment of the present disclosure.

[0050] FIG. 21A is a schematic diagram of a cross-sectional structure of the optical structure of FIG. 20 along line B-B.

[0051] FIG. 21B is a schematic diagram of a heat dissipation structure in an optical structure according to at least one embodiment of the present disclosure.

[0052] FIG. 22 is a schematic diagram of a second air duct wall according to at least one embodiment of the present disclosure.

[0053] FIG. 23 is a schematic diagram of another second air duct wall according to at least one embodiment of the present disclosure.

[0054] FIG. 24A is a schematic diagram of yet another second air duct wall according to at least one embodiment of the present disclosure.

[0055] FIG. 24B is a schematic diagram of yet another second air duct wall according to at least one embodiment of the present disclosure.

[0056] FIG. 25 is a schematic diagram of yet another second air duct wall according to at least one embodiment of the present disclosure.

[0057] FIGS. 26A-29B are cloud plots of simulation results for optical structures according to embodiments of the present disclosure.

[0058] FIGS. 30-32 are schematic diagrams of some second air duct walls according to at least one embodiment of the present disclosure.

[0059] FIGS. 33A-35B are cloud plots of simulation results for optical structures according to embodiments of the present disclosure.

[0060] FIGS. 36A-37B are cloud plots of simulation results for optical structures according to embodiments of the present disclosure.

[0061] FIGS. 38-39B are schematic diagrams of first air duct walls according to at least one embodiment of the present disclosure.

[0062] FIGS. 40A-46B are cloud plots of simulation results for optical structures according to embodiments of the present disclosure.

[0063] FIG. 47 is a summary plot of the results corresponding to the cloud plots of FIGS. 40A-46B. DETAILED DESCRIPTION

[0064] So that the manner in which the above recited features and advantages of the present disclosure can be understood in detail, a brief description of the embodiments of the present disclosure will be rendered by reference to specific implementations, which are illustrated in the appended drawings. It is appreciated that these embodiments are only part of the embodiments of the present disclosure and thus do not limit the present disclosure in any way. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without any inventive effort, fall within the scope of the present disclosure.

[0065] Unless otherwise defined, technical terms or scientific terms used in the present disclosure shall have the ordinary meanings as understood by those of ordinary skill in the art to which the present disclosure pertains. The terms “first”, “second”, and similar terms used in the present disclosure do not necessarily denote any order, quantity, or importance, but are used to distinguish different components. The terms “include”, “contain”, and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and equivalents thereof, and do not exclude other elements or objects. The terms “connected” or “coupled” and similar terms do not necessarily denote a physical or mechanical connection or coupling, but can include an electrical connection or coupling, whether direct or indirect. The terms “upper”, “lower”, “left”, “right”, and the like are used only to indicate relative positions, and when the absolute positions of the described objects are changed, the relative positions can also be changed accordingly.

[0066] Generally, as the main structure of the projection device, the optical structure can include a light source cavity and a display cavity. For example, the light source cavity includes a light source for providing brightness, and the display cavity includes a display panel, such as a liquid crystal display panel, for forming a display picture.

[0067] In the research, the inventors of the present disclosure found that the optical structure includes an internal circulating air duct, and the design of the internal circulating air duct of the optical structure (for example, a horizontal optical structure) is a relatively core problem in a projection device (for example, a projector or the like) and a technical difficulty. Since the internal circulating air duct of the optical structure is generally in a relatively closed state, it dissipates heat by heat exchange with the outside, and its heat dissipation efficiency is limited. Generally, the air in the internal circulating air duct circulates and then exchanges heat with the outside through the shell of the optical structure. The shell of the optical structure includes a top cover and a side cover connected to the top cover. For example, the material of the top cover of the optical structure is aluminum (the thermal conductivity coefficient is 90 W / mK-210 W / mK), so that during the long-time operation of the optical structure, the internal circulating air duct of the optical structure is likely to be in a high-temperature state for a long time, thereby reducing the performance and shortening the service life of the various devices in the optical structure. Therefore, it is very important to optimize the design of the internal circulating air duct of the optical structure.

[0068] At least one embodiment of the present disclosure provides an optical structure and a projection device.

[0069] The optical structure provided by at least one embodiment of the present disclosure has a light source assembly and a display assembly, the display assembly is located on the light-out side of the light source assembly, the display assembly includes a first lens, a display panel, a second lens and a mirror arranged in sequence along a first direction, the first lens is closer to the light source assembly than the display panel, the optical structure further includes a fan, a first air duct wall and a second air duct wall, in a second direction, the fan and the first air duct wall are respectively located on opposite sides of the display assembly, and the second air duct wall is located on the side of the display assembly close to the first air duct wall, the first direction is different from the second direction, the first air duct wall includes a first connecting portion, one end of the first connecting portion extends to the outline edge of the first lens, the second air duct wall includes a second connecting portion, one end of the second connecting portion extends to the outline edge of the display panel, the orthographic projection of the first connecting portion on a first plane and the orthographic projection of the second connecting portion on the first plane both overlap the orthographic projection of the second lens on the first plane, the first plane is a plane perpendicular to the second direction, the minimum distance between the first connecting portion and the second connecting portion in the second direction is a first distance A mm, the minimum distance between the second lens and the second connecting portion in the second direction is a second distance C mm, the minimum distance between the first lens and the display panel in the first direction is M mm, the minimum distance between the display panel and the second lens in the first direction is N mm, 0.30 x M ≤ A ≤ 12, 4.2 ≤ C ≤ N.

[0070] The embodiments of the present disclosure can optimize the structure of the internal circulating air duct of the optical structure to a good state by optimizing the minimum distance of the first connecting part and the second connecting part of the optical structure in the second direction, and the minimum distance of the second lens and the second connecting part in the second direction, thereby effectively improving the flow rate and temperature distribution of the fluid, improving the efficiency of heat exchange between the fluid and the outside, and making the fan structure have a good heat dissipation effect.

[0071] In some embodiments, as shown in FIG. 1 and FIG. 4, the optical structure 01 can have a light source cavity 10 and a display cavity 20, and include a light source assembly 100 located in the light source cavity 10 and a display assembly 200 located in the display cavity 20. As shown in FIG. 4, the light source assembly 100 can include a light source 101 and a light guide part 102, such as a light cup assembly, located on the light emitting side (the right side in the figure) of the light source 101. The light guide part 102 is configured to sufficiently diffuse the light emitted by the light source 101 to the display cavity 200. For example, the light source 101 can be various forms of light sources such as light emitting diodes (LEDs), energy-saving lamps, Mini-LEDs (generally with a size of 50 μm to 300 μm), and Micro-LEDs (generally with a size of less than 50 μm).

[0072] As shown in FIG. 4, the display assembly 200 is located on the light emitting side of the light source assembly 100, and the display assembly 200 includes a first lens 201, a display panel 202, a second lens 203, and a reflector 204 arranged in sequence along the first direction X, and the first lens 201 is closer to the light source assembly 100 than the display panel 202. The light emitted from the light source cavity 10 can pass through the first lens 201, the display panel 202, the second lens 203, and the reflector 204 in sequence to the projection outlet EX, thereby realizing projection display. For example, the reflector 204 is configured to reflect the light emitted from the second lens 203 so as to be emitted from the projection outlet EX.

[0073] As shown in FIG. 4 and FIG. 5, the optical structure 01 further includes a fan 205, a first air duct wall CV1, and a second air duct wall CV2 located in the display cavity 20. In the second direction Z, the fan 205 and the first air duct wall CV1 are respectively located on the opposite sides of the display assembly 200, and the second air duct wall CV2 is located on the side of the display assembly 200 close to the first air duct wall CV1. For example, the surface of the first air duct wall CV1 away from the second air duct wall CV2 is in contact with the outside air to facilitate heat exchange.

[0074] As shown in FIG. 1 and FIG. 4, the light source cavity 10 and the display cavity 20 are arranged adjacent to each other in the first direction X, the light source cavity 10 includes a cavity surrounded by a light guide part 102 for arranging the light source 101, and the display cavity 20 includes a cavity surrounded by the first lens 201, the first air duct wall CV1, and the cover on the side of the fan 205 away from the reflector 204. For example, the first direction X is different from the second direction Z, for example, the first direction X is perpendicular to the air outlet surface S2 of the fan 205, and the first direction X intersects the second direction Y. In some embodiments, the embodiments of the present disclosure are described by way of example with the first direction X being perpendicular to the second direction Z, but are not limited thereto.

[0075] For example, in some embodiments, as shown in FIG. 2 and FIG. 5, the first cover CV1 can include a top cover part 300 and the top cover part 300 is located on the side of the second cover CV2 away from the fan 205. For example, the top cover part 300 of the first cover CV1 and the second cover CV2 are arranged adjacent to each other in the second direction Z. For example, the first cover CV1 can further include other structures in addition to the top cover part 300, for example, further including a side cover part 320 (to be described in detail later), and the embodiments of the present disclosure are not limited thereto.

[0076] For example, as shown in FIG. 4 and FIG. 6, the first air duct wall CV1 includes a first connecting part 310, and the second air duct wall CV2 includes a second connecting part 410, one end of the first connecting part 310 extends to the contour edge 2011 of the first lens 201 to connect with the first lens 201, and one end of the second connecting part 410 extends to the contour edge 2012 of the display panel 202 to connect with the display panel 202. As shown in FIG. 6, the orthographic projection of the first connecting part 310 on the first plane A1 and the orthographic projection of the second connecting part 410 on the first plane A1 both overlap with the orthographic projection of the second lens 203 on the first plane A1.

[0077] In some embodiments, as shown in FIG. 6, the first connecting part 310 is a part of the first air duct wall CV1, for example, the extension direction of the first connecting part 310 is a non-straight line, so as to be well connected with the first lens 201, and the fluid flowing from the surface of the first lens 201 can flow smoothly along the surface of the first connecting part 310 to take away the heat of the first connecting part 310, thereby improving the heat dissipation effect. For example, the second connecting part 410 is a part of the second air duct wall CV2, for example, the extension direction of the second connecting part 410 is a non-straight line, so as to be well connected with the display panel 202, and the fluid flowing from the surface of the display panel 202 can flow smoothly along the surface of the second connecting part 410 to take away the heat of the second connecting part 410, thereby improving the heat dissipation effect.

[0078] For example, in some embodiments, as shown in FIG. 6, the optical structure 01 further comprises a heat insulation element 206. In the first direction X, the heat insulation element 206 is located between the first lens 201 and the display panel 202, and is spaced apart from the first lens 201 and the display panel 202, respectively. For example, the heat insulation element 206 can be heat insulation glass, but embodiments of the present disclosure are not limited thereto. There is a first channel C1 between the first lens 201 and the heat insulation element 206, a second channel C2 between the heat insulation element 206 and the display panel 202, a third channel C3 between the display panel 202 and the second lens 203, and a fourth channel C4 between the first air duct wall CV1 and the second air duct wall CV2. In some embodiments, the first channel C1 and the second channel C2 are both in communication with the fourth channel C4. There is a cavity U0 between the second air duct wall CV2 and the fan 205, and the cavity U0 is in communication with the third channel C3. The cavity U0 is a cavity surrounded by the second air duct wall CV2, the fan 205, and the second lens 203.

[0079] For example, in some embodiments, as shown in FIG. 6, the fan 205 has an air inlet surface S1 and an air outlet surface S2. A part of the airflow (e.g., air) blown out of the air outlet surface S2 of the fan 205 can enter the third channel C3, then enter the cavity U0, and finally flow back to the air inlet surface S1 of the fan. Another part of the airflow blown out of the air outlet surface S2 of the fan 205 can enter the first channel C1 and the second channel C2, respectively, and then flow to the fourth channel C4, and then flow back to the air inlet surface S1 of the fan. Thus, the first channel C1, the second channel C2, the third channel C3, the fourth channel C4, and the cavity U0 form an internal circulation air duct of the fan 01.

[0080] For example, in some embodiments, as shown in FIG. 6, the air inlet surface S1 has an air inlet opening, which can be circular, rectangular, or other suitable shapes. For example, in some examples, the surface opposite to the air inlet surface S1 can also be formed as an air inlet surface with an air inlet opening, so as to realize double-sided air inlet of the fan 205 and improve the air inlet amount. For example, the air outlet surface S2 has an air outlet opening, for example, the edge of the air outlet opening is along the edge of the air outlet surface S2, for example, in the shape of a rectangle or other suitable shapes.

[0081] As shown in FIG. 6, the minimum distance between the first connecting portion 310 and the second connecting portion 410 in the second direction Z is a first distance A mm, the minimum distance between the second lens 203 and the second connecting portion 410 in the second direction Z is a second distance C mm, the minimum distance between the first lens 201 and the display panel 202 in the first direction X is M mm, the minimum distance between the display panel 202 and the second lens 203 in the first direction X is N mm, and 0.3 x M ≤ A ≤ 12, 4.2 ≤ C ≤ N. It should be noted that in the embodiments of the present disclosure, the units of the first distance A, the second distance C, the minimum distance M between the first lens 201 and the display panel 202 in the first direction X, and the minimum distance N between the display panel 202 and the second lens 203 in the first direction X are all millimeters.

[0082] For example, in some embodiments, the first distance A is positively correlated with the minimum distance M between the first lens 201 and the display panel 202 in the first direction X, and the first distance A is less than 12. For example, the second distance C is greater than 4.2. For example, 14 ≤ M ≤ 15, 14.2 ≤ M ≤ 14.8, or 15 ≤ M ≤ 16. For example, 8 ≤ N ≤ 10, 8.5 ≤ N ≤ 9.5, or 8.9 ≤ N ≤ 9.2. For example, the first distance A can satisfy: 0.62 x M ≤ A ≤ 12, and the second distance C can satisfy: 4.2 ≤ C ≤ N. For example, the first distance A can be greater than the second distance C, but is not limited thereto. For example, 4 ≤ A ≤ 12, 9 ≤ A ≤ 11, 10 ≤ A ≤ 12, or 10.5 ≤ A ≤ 11.5. For example, 4.2 ≤ C ≤ 9, 4.2 ≤ C ≤ 7.2, 5.0 ≤ C ≤ 7.0, 5.5 ≤ C ≤ 6.5, or 6.0 ≤ C ≤ 7.2.

[0083] In this way, the air flow blown out of the air outlet surface S2 of the fan 205 can be well distributed, for example, the air flow entering the fourth channel C4 from the first channel C1 and the second channel C2 can be appropriately distributed, and the air flow entering the cavity U0 from the third channel C3 can be appropriately distributed. For example, the air flow entering the fourth channel C4 is greater than the air flow entering the third channel C3, which is conducive to making the flow rate of the air flow more stable when entering each channel, and having a more smooth flow state. Thus, the structure of the internal circulation air duct of the optical structure 01 can be optimized to a good state, which can effectively improve the flow rate and temperature distribution of the fluid, improve the efficiency of heat exchange between the air flow and the outside, and make the fan structure have a good heat dissipation effect.

[0084] For example, in some embodiments, as shown in FIG. 6, the flow passage C123 between the first lens 201 and the second lens 203 has a size in the first direction X smaller than a size of the fan 205 in the second direction Z. For example, a plurality of devices such as the display panel 202, the heat insulation element 206, etc. can be arranged between the first lens 201 and the second lens 203, and the size of the flow passage C123 in the first direction X refers to a sum of sizes of passages in the first direction X between each two adjacent devices among the first lens 201, the second lens 203, and the plurality of devices arranged therebetween.

[0085] For example, in some embodiments, as shown in FIG. 6, the flow passage C123 can include a plurality of sub-passages, for example, a first passage C1, a second passage C2, and a third passage C3. In the first direction X, a distance between the first lens 201 and the heat insulation element 206 is M1 (i.e., a size of the first passage C1), a distance between the heat insulation element 206 and the display panel 202 is M2 (i.e., a size of the second passage C2), a distance between the display panel 202 and the second lens 203 is N (i.e., a size of the third passage C3), a size of the fan 205 in the second direction Z is F, and M1+M2+N<F. For example, when other devices are arranged between the first lens 201 and the second lens 203, the flow passage C123 can further include other sub-passages, which are not limited in the embodiments of the present disclosure.

[0086] In this way, the size of the air outlet surface S2 of the fan 205 is increased, so that the fan 205 has a large enough air volume, and when the air flow is discharged from the fan 205, the air flow can enter the flow passage C123, the flow rate of the air flow in the flow passage C123 is increased, so that the air flow can take away heat on surfaces of the devices (e.g., the first lens 201, the heat insulation element 206, the display panel 202, and the second lens 203), and the heat exchange capacity is increased.

[0087] For example, in some embodiments, as shown in FIG. 6, the air flow entering the third passage C3 can be 1 / 4-2 / 3, such as 1 / 3 or 1 / 2, of the air flow entering the fourth passage C4. For example, when the flow rate of the air flow in the third passage C3 is substantially equal to the flow rate of the air flow in the fourth passage C4, when the air flow passage area of the third passage C3 is 1 / 2 of the air flow passage area of the fourth passage C4, the air flow of the third passage C3 can be 1 / 2 of the air flow of the fourth passage C4. When the air flow passage area of the third passage C3 is 1 / 3 of the air flow passage area of the fourth passage C4, the air flow of the third passage C3 can be 1 / 3 of the air flow of the fourth passage C4, but the embodiments of the present disclosure are not limited thereto.

[0088] Therefore, the air flow is reasonably distributed, so that the air flow flows smoothly in each channel and carries away the heat in each channel, thereby achieving good heat dissipation effect.

[0089] For example, in some embodiments, as shown in FIG. 6, the first distance A and the second distance C satisfy: 15.5≤A+C≤16.5, for example, can be 15.8≤A+C≤16.0, 15.6≤A+C≤15.9, 16.0≤A+C≤16.1 or 16.1≤A+C≤16.2. For example, 7≤A≤10, such as 8≤A≤9, 9≤A≤10, 9.2≤A≤9.8, 9.4≤A≤9.6, 9.3≤A≤9.5 or 9.7≤A≤9.9. For example, when A+C can be equal to 16.2, 9≤A≤10 can be made (for the corresponding simulation results under this scheme, please refer to the relevant description of FIG. 17 and FIG. 18 below).

[0090] Therefore, the structure of the internal circulating air duct of the optical structure can be further optimized, so that the total air flow flowing out of the first channel C1, the second channel C2 and the third channel C3 reaches a reasonable range, so as to facilitate the smooth flow of air flow within a reasonable air outlet width range, improve the efficiency of heat exchange between the air flow and the outside, and make the fan structure have good heat dissipation effect.

[0091] For example, in some embodiments, as shown in FIG. 5 and FIG. 6, the first air duct wall CV1 includes a first extension 330 located away from the fan 205 on one side of the reflector 204. At least part of the first extension 330 is parallel to the first plane A1, and the orthographic projection of the first extension 330 on the first plane A1 at least partially overlaps the orthographic projection of the reflector 204 on the first plane A1. For example, in some embodiments, the surface of the first extension 330 close to the fan is parallel to the first plane A1.

[0092] For example, in some embodiments, as shown in FIG. 5 and FIG. 6, the second cover plate CV2 further includes a second extension 430 located away from the fan 205 on one side of the reflector 204. At least part of the second extension 430 is parallel to the first plane A1, and the orthographic projection of the second extension 430 on the first plane A1 at least partially overlaps the orthographic projection of the reflector 204 on the first plane A1. For example, in some embodiments, the surface of the second extension 430 close to the fan is parallel to the first plane A1. In this way, the distance between the first extension 330 and the second extension 430 in the second direction Z can be uniform, thereby facilitating the smooth flow of air flow between the first extension 330 and the second extension 430 to have uniform and stable flow rate.

[0093] For example, in some embodiments, as shown in FIG. 6, the minimum distance between the first extension 330 and the second extension 430 in the second direction Z is B mm, and B > A, and / or B > C.

[0094] For example, 9.0 < B < 13.0, such as 9.0 < B < 10.0, 9.2 < B < 9.8, 9.4 < B < 9.6, 9.3 < B < 9.5, 9.1 < B < 9.4, or 9.6 < B < 9.9.

[0095] In this way, the airflow can be further accommodated by the fourth channel C4, and a buffer space is provided for the flow of the airflow, so that the airflow flows more smoothly and is quickly guided into the cavity U0, so as to reduce the airflow blockage, which is conducive to reducing the temperature of the device.

[0096] For example, in some embodiments, as shown in FIG. 6, the first air duct wall CV1 further includes a first inclined portion 320. The first extension 330 is connected to the first connecting portion 310 through the first inclined portion 320. The first inclined portion 320 includes opposite first and second ends 3201 and 3202. The first end 3201 is connected to the first connecting portion 310, and the second end 3202 is connected to the first extension 330. The first end 3201 is farther away from the fan 205 than the second end 3202.

[0097] For example, in some embodiments, as shown in FIG. 6, the first plane A1 can be a plane perpendicular to the second direction Z. The first extension 330 of the first air duct wall CV1 is substantially parallel to the first plane A1. The end of the first connecting portion 310 close to the first inclined portion 320 is farther away from the fan 205 than the first extension 330, so that the first end 3201 of the first inclined portion 320 is farther away from the fan 205 than the second end 3202.

[0098] For example, in some embodiments, as shown in FIG. 6, the second air duct wall CV2 further includes a second inclined portion 420. The second extension 430 is connected to the second connecting portion 410 through the second inclined portion 420. The second inclined portion 420 includes opposite third and fourth ends 4201 and 4202. The third end 4201 is connected to the second connecting portion 410, and the fourth end 4202 is connected to the second extension 430. The third end 4201 is farther away from the fan 205 than the fourth end 4202.

[0099] For example, as shown in FIG. 6, the end of the second connecting portion 410 close to the second extending portion 430 is farther away from the fan 205 than the second extending portion 430, so that the third end 4201 of the second inclined portion 420 is farther away from the fan 205 than the fourth end 4202. The second extending portion 430 can be substantially parallel to the first plane A1, so that the second extending portion 430 is substantially parallel to the first extending portion 330, thereby making the distance between the first extending portion 330 and the second extending portion 430 in the second direction Z more uniform.

[0100] For example, in some embodiments, as shown in FIG. 6, the first inclined portion 320 and the first plane A1 have a first included angle a1, and the second inclined portion 420 and the first plane A1 have a second included angle a2. For example, in some embodiments, the ratio between the second included angle a2 and the first included angle a1 is 1.5-3, such as 1.2-1.6, 1.4-1.8, 1.5-2, 2-2.5, 2.4-2.8, 2.6-3. For example, in some embodiments, the first included angle a1 can be smaller than the second included angle a2. For example, the first included angle a1 can be 20-30 degrees, such as 25-30 degrees, 22-26 degrees, 23-27 degrees, or 24-28 degrees. For example, the second included angle a2 can be 40-50 degrees, such as 42-48 degrees, such as 43-46 degrees, 45-49 degrees, 41-47 degrees, or 46-49 degrees.

[0101] In this way, the distance between the first inclined portion 320 and the second inclined portion 420 can be substantially uniform, for example, the distance can be substantially equal to the first distance A, or substantially equal to the distance B. Thus, the flow rate of the airflow in the fourth channel C4 can be uniform, the flow resistance of the airflow can be reduced, and the temperature of the device can be reduced.

[0102] FIGS. 7A-16B are simulation analysis result cloud maps of the optical structure according to the embodiments of the present disclosure; Table 1 is a result summary table corresponding to the cloud maps in FIGS. 7A-16B; FIG. 17 is a temperature distribution schematic diagram corresponding to the optical structures in FIGS. 7B, 8B, 9B, 10B, 11B, 12B, 13B, 14B, 15B, and 16B; and FIG. 18 is a velocity distribution schematic diagram corresponding to the optical structures in FIGS. 7A, 8A, 9A, 10A, 11A, 12A, 13A, 14A, 15A, and 16A.

[0103] For example, as shown in FIGS. 6, 7A-16B, when the optical structure according to the embodiments of the present disclosure is simulated and analyzed, the first distance A and the second distance C in the optical structure satisfy: A+C=16.2, the distance B=9.2, and the fluid in the optical structure is air.

[0104] FIG. 7A and FIG. 7B are result cloud diagrams corresponding to the first distance A = 5; FIG. 8A and FIG. 8B are result cloud diagrams corresponding to the first distance A = 6; FIG. 9A and FIG. 9B are result cloud diagrams corresponding to the first distance A = 7; FIG. 10A and FIG. 10B are result cloud diagrams corresponding to the first distance A = 8; FIG. 11A and FIG. 11B are result cloud diagrams corresponding to the first distance A = 9; FIG. 12A and FIG. 12B are result cloud diagrams corresponding to the first distance A = 10; FIG. 13A and FIG. 13B are result cloud diagrams corresponding to the first distance A = 11; FIG. 14A and FIG. 14B are result cloud diagrams corresponding to the first distance A = 12; FIG. 15A and FIG. 15B are result cloud diagrams corresponding to the first distance A = 13; and FIG. 16A and FIG. 16B are result cloud diagrams corresponding to the first distance A = 14.

[0105] For example, in some embodiments, as shown in FIG. 7A and FIG. 7B, “plane1” in the figure represents a plane 1, which is a reference plane selected when performing simulation modeling, “Y = -3mm” in the figure represents that the distance between the plane 1 and the center of the simulation modeling (i.e., the gravity center of the optical engine structure) in the Y direction shown in FIG. 5 is 3mm, and the results of each cloud diagram in this application are obtained based on the plane 1; “3.81m / s” in the figure represents that the speed of air is 3.81 meters per second; and “53.2degC” in the figure represents that the temperature is 53.2 degrees Celsius, i.e., 53.2℃. In other result cloud diagrams, the meanings of the symbols shown are the same as above, and will not be described hereinafter.

[0106] For example, in some embodiments, as shown in Table 1, FIG. 6 and FIG. 17, when the first distance A satisfies: 5≤A≤13, as the first distance A gradually increases, the temperature of the display panel 202 gradually decreases; when the first distance A satisfies: 13≤A≤14, as the first distance A gradually increases, the temperature of the display panel 202 gradually increases. When the first distance A satisfies: 5≤A≤14, as the first distance A gradually increases, the temperature of the heat insulation element 206 gradually increases. When the first distance A satisfies: 5≤A≤14, and as the first distance A gradually increases, the temperature difference between the display panel 202 and the heat insulation element 206 gradually decreases. When the first distance A satisfies: 7≤A≤9, the temperature difference between the display panel 202 and the heat insulation element 206 tends to be stable and basically unchanged, i.e., about 7℃. When the first distance A satisfies: 5≤A≤7, the temperature difference between the display panel 202 and the heat insulation element 206 is large. When the first distance A satisfies: 9≤A≤14, as the first distance A gradually increases, the temperature of the display panel 202 decreases significantly. When 9≤A≤10, the temperature of the display panel 202 and the heat insulation element 206 changes rapidly, and the temperature difference between them has a significant decrease.

[0107] For example, in some embodiments, as shown in Table 1, FIG. 6 and FIG. 18, when the first distance A satisfies: 5≤A≤12, as the first distance A gradually increases, the flow rate of air in the first channel C1 tends to decrease, the flow rate of air in the second channel C2 tends to increase, and the flow rate of air in the third channel C3 generally tends to decrease, with a slight increase when the first distance A=9.

[0108] When the first distance A satisfies: 7≤A≤9, as the first distance A gradually increases, the flow rates of air in the first channel C1, the second channel C2 and the third channel C3 all change little and basically tend to be stable. When the first distance A satisfies: 5≤A≤7, as the first distance A gradually increases, the flow rates of air in the second channel C2 and in the third channel C3 change rapidly, and the flow rate of air in the third channel C3 is the largest and relatively stable. When the first distance A satisfies: 9≤A≤10, the flow rates of air in the first channel C1 and the second channel C2 are basically uniform, and as the first distance A gradually increases, the flow rate of air in the third channel C3 slightly decreases but is generally stable. When 10≤A≤14, as the first distance A gradually increases, the flow rate of air in the third channel C3 is unstable, first decreases, then suddenly increases, and finally decreases, and changes rapidly, which is not conducive to heat dissipation of the device.

[0109] According to the simulation results, on the one hand, as shown in Table 1 and FIG. 17, in order to make the temperature difference between the display panel 202 and the heat insulation element 206 smaller when the air flows, and the temperature change of the display panel 202 and the heat insulation element 206 slower, the first distance A can satisfy: 9≤A≤11. On the other hand, as shown in Table 1, FIG. 6 and FIG. 18, in order to make the air have a larger flow rate and not change too much so that it can flow smoothly and stably in each channel, for example, in some embodiments, the first distance A can satisfy: 9≤A≤10. Correspondingly, the first distance C satisfies: 6.2≤C≤7.2. At the same time, the first distance A and the second distance C can both maintain a suitable numerical range, which is conducive to the reasonable arrangement of the first connecting portion 310 and the second connecting portion 410.

[0110] Table 1

[0111] For example, in some embodiments, as shown in FIG. 6, the first connecting portion 310 includes a first sub-connecting portion 3101 and a second sub-connecting portion 3102. The first sub-connecting portion 3101 is connected with the second sub-connecting portion 3102, and the second sub-connecting portion 3102 is closer to the first lens 201 than the first sub-connecting portion 3101. For example, in some embodiments, the first sub-connecting portion 3101 and the second sub-connecting portion 3102 are in an integrated structure. An end of the first sub-connecting portion 3101 away from the second sub-connecting portion 3102 is connected with the first lens 201, and an end of the second sub-connecting portion 3102 away from the first sub-connecting portion 3101 is connected with the first extending portion 330.

[0112] For example, in some embodiments, as shown in FIG. 6, a surface of the first sub-connecting portion 3101 facing the second lens 203 is in a first arc shape. For example, a cross section of the second sub-connecting portion 3102 can be in a first rectangle shape. In this way, the airflow flowing out of the first channel C1 can flow along the inner surface (i.e., the surface facing the second connecting portion 410) of the first sub-connecting portion 3101 smoothly, and the wind resistance can be effectively controlled, which is conducive to reducing the temperature of the device (e.g., the heat insulation element 206 or the first connecting portion 310).

[0113] For example, in some embodiments, as shown in FIG. 6, the second connecting portion 410 includes a third sub-connecting portion 4101 and a fourth sub-connecting portion 4102. The third sub-connecting portion 4101 is connected with the fourth sub-connecting portion 4102, and the fourth sub-connecting portion 4102 is closer to the display panel 202 than the second sub-connecting portion 3102. For example, in some embodiments, the third sub-connecting portion 4101 and the fourth sub-connecting portion 4102 are in an integrated structure. An end of the third sub-connecting portion 4101 away from the fourth sub-connecting portion 4102 is connected with the display panel 202, and an end of the fourth sub-connecting portion 4102 away from the third sub-connecting portion 4101 is connected with the second extending portion 430.

[0114] For example, in some embodiments, as shown in FIG. 6, a surface of the third sub-connecting portion 4101 facing the second lens 203 is in a second arc shape. For example, a cross section of the fourth sub-connecting portion 4102 can be in a second rectangle shape. In this way, the airflow flowing out of the second channel C2 can flow along the outer surface (i.e., the surface facing the first connecting portion 310) of the third sub-connecting portion 4101 smoothly, and the wind resistance can be effectively controlled, which is conducive to reducing the temperature of the device (e.g., the heat insulation element 206 or the display panel 202).

[0115] For example, in some embodiments, as shown in FIG. 6, the radius of curvature R1 of the first arc is greater than the radius of curvature R2 of the second arc. The second sub-connection portion 3102 is substantially parallel to the first plane A1, and the fourth sub-connection portion 4102 is substantially parallel to the first plane A1. In this way, the second sub-connection portion 3201 can be smoothly connected to the first lens 201 through the first sub-connection portion 3101, and the fourth sub-connection portion 4102 can be smoothly connected to the display panel 202 through the third sub-connection portion 4101, which is conducive to making the distance between the first sub-connection portion 3101 and the third sub-connection portion 4101 uniform, so as to reduce the risk of device temperature rising due to airflow blockage and flow rate mutation.

[0116] For example, in some embodiments, as shown in FIG. 6, the radius of curvature of the first arc can be 15mm-18mm, such as 16mm-18mm, 17mm-18mm, 15mm-17mm, or 16mm-17mm. For example, the radius of curvature of the second arc can be 5mm-10mm, such as 5mm-8mm, 6mm-8mm, 7mm-10mm, or 7.5mm-9.0mm. Thus, it is conducive to further reducing the risk of device temperature rising due to airflow flow rate mutation.

[0117] FIG. 19 is a schematic diagram of an internal structure of an optical structure according to at least one embodiment of the present disclosure; FIG. 20 is a front view of an optical structure according to at least one embodiment of the present disclosure; FIG. 21A is a schematic diagram of a cross-sectional structure of the optical structure in FIG. 20 along line B-B; and FIG. 21B is a schematic diagram of a heat dissipation structure in the optical structure according to at least one embodiment of the present disclosure.

[0118] For example, FIG. 19 can be a schematic diagram of an internal structure of the optical structure after removing the top cover. As shown in FIG. 19, the second extension portion 430 of the second air duct wall CV2 includes a first extension piece 4301 and a second extension piece 4302, and a connecting piece 4303 between the first extension piece 4301 and the second extension piece 4302. For example, in some embodiments, the orthographic projection of the first extension piece 4301 on the first plane A1 and the orthographic projection of the second extension piece 4302 on the first plane A1 do not overlap and are located on two sides of the reflector 204, respectively. The end of the reflector 204 away from the fan 205 at least partially contacts the connecting piece 4303. For example, in some embodiments, the main extension direction of the reflector 204 is perpendicular to the main extension direction of the second extension portion 430, and the end face of the reflector 204 close to the second extension portion 430 is parallel to the first plane A1. The end face of the reflector 204 contacts the second extension portion 430 and abuts against each other. For example, in some embodiments, the reflector 204 can provide support for the second extension portion 430.

[0119] For example, in some embodiments, as shown in FIG. 5, FIG. 20 and FIG. 21A, the reflector 204 can divide the cavity U0 into two parts. For example, in some embodiments, the reflector 204 and the second lens 203 have a first cavity U1, and the side of the reflector 204 away from the first cavity U1 has a second cavity U2. For example, the first cavity U1 and the second cavity U2 are both part of the cavity U0, and are located on two sides of the reflector 204, respectively. The first cavity U1 can be a cavity surrounded by the reflector 204, the second lens 203, and the second duct wall CV2. The second cavity U2 can be a cavity surrounded by the reflector 204, the second duct wall CV2, and the side cover part 320 (see FIG. 38) of the first duct wall CV1. The first duct wall CV1 and the second duct wall CV2 have a third cavity U3 therebetween.

[0120] For example, in some embodiments, as shown in FIG. 5 and FIG. 19, the first extension part 4301 has at least one first opening 4310, the second extension part 4302 has at least one second opening 4320, the first cavity U1 and the third cavity U3 are in communication through the first opening 4310, and the second cavity U2 and the third cavity U3 are in communication through the second opening 4320. At least part of the third cavity U3 can serve as the fourth channel C4 (see FIG. 6) described above. For example, in some embodiments, the first extension part 4301 can have one or more first openings 4310, and the second extension part 4302 can have one or more second openings 4320.

[0121] For example, in some embodiments, as shown in FIG. 5-6 and FIG. 19, after the fluid flows out of the first channel C1 and the second channel C2, it converges in the third cavity U3, part of the fluid enters the first cavity U1 through the first opening 4310, part of the fluid enters the second cavity U2 through the second opening 4320, and finally all of the fluid flows back to the air inlet surface S1 of the fan 205.

[0122] For example, in some embodiments, as shown in FIG. 5 and FIG. 19, the optical structure further comprises a heat dissipation element 450 located in the second cavity U2. For example, in some embodiments, the heat dissipation element 450 can be a heat sink. The heat dissipation element 450 is configured to cool the airflow entering the second cavity U2, so that the airflow returning to the fan 205 has a lower temperature. For example, in some embodiments, the opening area of the at least one first opening 4310 is smaller than the opening area of the at least one second opening 4320, that is, the total opening area of the first openings 4310 in the first extension 4301 is smaller than the total opening area of the second openings 4320 in the second extension 4302. For example, in some embodiments, as shown in FIG. 19, the first extension 4301 has a plurality of first openings 4310, and the second extension 4302 has a plurality of second openings 4320, and the total opening area of the plurality of first openings 4310 is smaller than the total opening area of the plurality of second openings 4320.

[0123] As shown in FIG. 5 and FIG. 19, in this way, a larger portion of the airflow in the third cavity U3 can enter the second cavity U2 through the second openings 4320 to be cooled by the heat dissipation element 450, so that the airflow returning to the fan 205 has a lower temperature, which is beneficial to the safety of the device.

[0124] For example, in some embodiments, as shown in FIG. 19, the area of the orthographic projection of the second openings 4320 in the second extension 4302 on the first plane A1 is greater than the area of the orthographic projection of the heat dissipation element 450 on the first plane A1. For example, in some embodiments, when the second extension 4302 has a plurality of second openings 4320, the sum of the areas of the orthographic projections of the plurality of second openings 4320 on the first plane A1 is greater than the area of the orthographic projection of the heat dissipation element 450 on the first plane A1. In this way, the airflow entering the second cavity U2 from the second openings 4320 can have a larger flow rate and can be in sufficient contact with the heat dissipation element 450 for good heat exchange.

[0125] FIG. 22 is a schematic view of a second air duct wall according to at least one embodiment of the present disclosure.

[0126] For example, in some embodiments, as shown in FIG. 22, for the second air duct wall CV2, the number of first openings 4310 can be greater than the number of second openings 4320. For example, in some embodiments, the second air duct wall CV2 can be provided with only one second opening 4320, and the second air duct wall CV2 can be provided with a plurality of first openings 4310. In this way, the airflow entering the second cavity U2 can be in sufficient contact with the heat dissipation element 450, and the manufacturing process of the second air duct wall CV2 can be simplified, so that the structure of the second air duct wall CV2 is simpler.

[0127] FIG. 23 is a schematic view of another second air duct wall according to at least one embodiment of the present disclosure; FIG. 24A is a schematic view of yet another second air duct wall according to at least one embodiment of the present disclosure; FIG. 24B is a schematic view of yet another second air duct wall according to at least one embodiment of the present disclosure; and FIG. 25 is a schematic view of yet another second air duct wall according to at least one embodiment of the present disclosure.

[0128] For example, in some embodiments, as shown in FIGS. 23-25, the second air duct wall CV2 is provided with only one second opening 4320, and the number of the first openings 4310 in the second air duct wall CV2 is no more than 5. For example, as shown in FIGS. 23 and 25, the second air duct wall CV2 is provided with 5 first openings 4310. For example, as shown in FIG. 24A, the second air duct wall CV2 is provided with 4 first openings 4310, and in other embodiments, the second air duct wall CV2 can also be provided with 3, 2, or 1 first opening 4310.

[0129] For example, in some embodiments, as shown in FIGS. 5, 23-25, the opening area of the first openings 4310 in the second air duct wall CV2 is 9.0%-19% of the opening area of the second opening 4320, i.e., the total area of the orthographic projection of the plurality of first openings 4310 on the first plane Al is 9.0%-19% of the total area of the orthographic projection of the second opening 4320 on the first plane Al, such as 9.0%-19.0%, 10.0%-18.0%, 12.0%-16.0%, or 13.0%-15.0%. Compared with the second air duct wall CV2 shown in FIG. 22, 75%-85% of the first openings 4310 in the second air duct wall CV2 are blocked. In this way, the airflow in the third cavity U3 can be in sufficient contact with the first air duct wall CV1 to enhance the heat exchange capacity with the outside, so that the temperature of the airflow in the third cavity U3 is reduced before entering the first cavity Ul through the first openings 4310, which is conducive to reducing the device temperature.

[0130] For example, in some embodiments, as shown in FIGS. 5, 23-25, the opening area of the first openings 4310 in the second air duct wall CV2 is 12.0%-16% of the opening area of the second opening 4320, such as 12.0%-15%, 13.0%-14.0%, or 14.0%-16.0%, i.e., compared with the second air duct wall CV2 shown in FIG. 22, 75%-80% of the first openings 4310 in the second air duct wall CV2 are blocked. Thus, the heat exchange efficiency of the airflow in the third cavity U3 with the outside can be further improved, which is further conducive to reducing the temperature of the airflow entering the first cavity Ul.

[0131] For example, in some embodiments, as shown in FIG. 5 and FIG. 24A, the connector 4303 of the second air duct wall CV2 includes a first edge 4350 close to the second opening 4320, the second inclined portion 420 of the second air duct wall CV2 includes a second edge 4250 close to the second opening 4320, the extension direction of the first edge 4350 intersects with the extension direction of the second edge 4250, and the included angle between the extension direction of the first edge 4350 and the extension direction of the second edge 4250 is an acute angle. For example, the angle between the first edge 4350 and the second edge 4250 can be 25°-55°, such as 30°-50°, 35°-45°, 40°-55°, or 40°-45°.

[0132] For example, in some embodiments, as shown in FIG. 5 and FIG. 24A, at least one first opening 4310 in the first extension 4301 is arranged along the first edge 4350. The first extension 4301 includes a plurality of first openings 4310, and the plurality of first openings 4310 are sequentially and spaced arranged along the first edge 4350. The arrangement direction of the plurality of first openings 4310 is the same as the extension direction of the first edge 4350.

[0133] For example, in some embodiments, as shown in FIG. 5 and FIG. 24A, the first extension 4301 includes a first sub-opening 4311, a second sub-opening 4312, a third sub-opening 4313, and a fourth sub-opening 4314, and the distance between the second edge 4250 and the first sub-opening 4311, the second sub-opening 4312, the third sub-opening 4313, and the fourth sub-opening 4314 increases sequentially. Therefore, the flow path of the air flow entering the first sub-opening 4311 is smaller than the flow path of the air flow entering the second sub-opening 4312, the flow path of the air flow entering the second sub-opening 4312 is smaller than the flow path of the air flow entering the third sub-opening 4313, the flow path of the air flow entering the third sub-opening 4313 is smaller than the flow path of the air flow entering the fourth sub-opening 4314. By arranging the first openings 4310 in the first extension 4301 along the first edge 4350, the flow path of the air flow in the third cavity U3 is increased, so that the air flow is in sufficient contact with the first air duct wall CV1, and the heat exchange capacity is enhanced. For simulation results of the second cover plate CV2 shown in FIG. 24A, please refer to the description of Table 2 and FIG. 28A-FIG. 28B below.

[0134] For example, in some embodiments, the first extension 4301 can also include only one first opening 4310 located at the edge of the first edge 4350. For example, in some embodiments, the orthographic projection of the one first opening 4310 on the first plane A1 is an ellipse, thereby simplifying the structure of the second air duct wall CV2 and reducing the manufacturing difficulty.

[0135] For example, in some embodiments, based on the embodiment of FIG. 24A, as shown in FIG. 24B, the first sub-opening 4311, the second sub-opening 4312, the third sub-opening 4313, and the fourth sub-opening 4314 can also be communicated into a first opening, i.e., the first opening 4310 in FIG. 24B, at this time the length direction of the first opening 4310 is substantially parallel to the extension direction of the first edge 4350.

[0136] For example, as shown in FIG. 24A, the second extension 4302 has a second opening 4320. The first edge 4350 is at least part of the edge of the second opening 4320 close to the first extension 4301, that is, the edge of the second opening 4320 close to the first extension 4301 includes the first edge 4350. For example, in some embodiments, the maximum dimension of the second opening 4320 in the extension direction of the first edge 4350 is a first dimension M1, the maximum dimension of the second opening 4320 in the direction perpendicular to the extension direction of the first edge 4350 is a second dimension M2, and the first dimension M1 is greater than the second dimension M2. Thus, it is beneficial to increase the opening area of the second opening 4320 to facilitate the flow of air through the second opening 4320 into the second cavity U2 (as shown in FIG. 5) for cooling.

[0137] For example, in some embodiments, as shown in FIG. 5 and FIG. 24A, the orthographic projection of the first opening 4310 on the first plane A1 can be a sector, a circle, an ellipse, or a polygon. For example, the orthographic projection of the second opening 4320 on the first plane A1 (as shown in FIG. 5) is a sector, a circle, an ellipse, or a polygon. For example, the orthographic projection shape of the first opening 4310 on the first plane A1 can be the same as or different from the orthographic projection shape of the second opening 4320 on the first plane A1, and the embodiments of the present disclosure are not limited in this regard. For example, when the second extension 4302 has a plurality of second openings 4320, the orthographic projection shapes of the plurality of second openings 4320 on the first plane A1 can be the same or different, and the embodiments of the present disclosure are not limited in this regard, and can be set according to the structural strength or spatial arrangement requirements.

[0138] FIGS. 26A-29B are simulation analysis result cloud maps of optical structures according to embodiments of the present disclosure; and Table 2 is a result summary table corresponding to the cloud maps in FIGS. 26A-29B.

[0139] For example, as shown in FIGS. 6, 26A-29B, when the optical structure according to the embodiments of the present disclosure is simulated and analyzed, the first distance A in the optical structure satisfies A=9.0, the distance B satisfies B=9.2, the second distance C satisfies C=7.2, and the fluid in the optical structure is air.

[0140] For example, FIGS. 26A and 26B are result cloud diagrams corresponding to the second duct wall shown in FIG. 22; FIGS. 27A and 27B are result cloud diagrams corresponding to the second duct wall shown in FIG. 23; FIGS. 28A and 28B are result cloud diagrams corresponding to the second duct wall shown in FIG. 24A; and FIGS. 29A and 29B are result cloud diagrams corresponding to the second duct wall shown in FIG. 25.

[0141] For example, as shown in Table 2, FIG. 6, FIGS. 26A to 26B, for the second duct wall CV2 shown in FIG. 22, at the turning position of the passage between the first duct wall CV1 and the second duct wall CV2, the air flow velocity is 2.41 m / s. The velocity of the air flow in the first passage CI is 1.91 m / s, and the velocity of the air flow in the second passage C2 is 1.82 m / s, so the air flow velocity at the above-mentioned turning position changes greatly.

[0142] For example, as shown in Table 2, FIG. 6, FIGS. 27A to 27B, for the second duct wall CV2 shown in FIG. 23, i.e., corresponding to the case where about 73% of the first openings 4310 in the second duct wall CV2 shown in FIG. 22 are blocked, at the turning position of the passage between the first duct wall CV1 and the second duct wall CV2, the air flow velocity is 2.27 m / s. The velocity of the air flow in the first passage CI is 2.01 m / s, and the velocity of the air flow in the second passage C2 is 1.68 m / s, so the air flow velocity at the above-mentioned turning position changes greatly.

[0143] For example, as shown in Table 2, FIG. 6, FIGS. 28A to 28B, for the second duct wall CV2 shown in FIG. 24A, i.e., corresponding to the case where about 79% of the first openings 4310 in the second duct wall CV2 shown in FIG. 22 are blocked, at the turning position of the passage between the first duct wall CV1 and the second duct wall CV2, the air flow velocity is 1.97 m / s. The velocity of the air flow in the first passage CI is 1.92 m / s, and the velocity of the air flow in the second passage C2 is 1.73 m / s, so the air flow velocity at the above-mentioned turning position does not change abruptly and is relatively stable.

[0144] For example, as shown in Table 2, FIG. 6, FIGS. 29A to 29B, for the second duct wall CV2 shown in FIG. 25, i.e., corresponding to the case where about 73% of the first openings 4310 in the second duct wall CV2 shown in FIG. 22 are blocked, at the turning position of the passage between the first duct wall CV1 and the second duct wall CV2, the air flow velocity is 2.48 m / s. The velocity of the air flow in the first passage CI is 2.07 m / s, and the velocity of the air flow in the second passage C2 is 1.87 m / s, so the air flow velocity at the above-mentioned turning position changes greatly.

[0145] Therefore, for the second air duct wall CV2 shown in FIG. 24A, the ratio of the opening area of the first opening 4310 to the opening area of the second opening 4320 is about 16%, the first extension 4301 (as shown in FIG. 19) includes a plurality of first openings 4310, and the plurality of first openings 4310 are sequentially and spaced arranged along the first edge 4350. The second cover plate CV2 with such a structure can make the air flow speed more stable, and the temperature of the display panel 202 and the heat insulation element 206 is lower, which is beneficial to improve the service life of each device.

[0146] Table 2

[0147] FIGS. 30-32 are schematic diagrams of some second air duct walls provided in at least one embodiment of the present disclosure. FIGS. 33A-35B are simulation analysis result cloud maps of optical structures provided in embodiments of the present disclosure; and Table 3 is a result summary table corresponding to the cloud maps in FIGS. 33A-35B. The simulation results of the optical structure in which the second air duct wall CV2 shown in FIG. 24A is located can be found in the results corresponding to serial number 1 in Table 3. For example, FIGS. 33A and 33B are result cloud maps corresponding to the second air duct wall shown in FIG. 30, and the simulation results can be found in the results corresponding to serial number 2 in Table 3; FIGS. 34A and 34B are result cloud maps corresponding to the second air duct wall shown in FIG. 31, and the simulation results can be found in the results corresponding to serial number 3 in Table 3; and FIGS. 35A and 35B are result cloud maps corresponding to the second air duct wall shown in FIG. 32, and the simulation results can be found in the results corresponding to serial number 4 in Table 3.

[0148] For example, as shown in FIGS. 6, 33A-35B, when the optical structure provided in the embodiments of the present disclosure is simulated and analyzed, the first distance A in the optical structure satisfies: A = 9.0, the distance B satisfies: B = 9.2, the second distance C satisfies: C = 7.2, and the fluid in the optical structure is air.

[0149] For example, the structure of the first extension 4301 in the second air duct wall shown in FIGS. 30-32 is the same as that in FIG. 24A, and the difference lies in the structure of the second extension 4302. For example, compared with the second opening 4320 in FIG. 24A, the opening area of the second opening 4320 in the second air duct wall shown in FIGS. 30-32 is smaller. For example, the opening area of the second opening 4320 shown in FIG. 30 is smaller than that of the second opening 4320 shown in FIG. 24A, the opening area of the second opening 4320 shown in FIG. 31 is smaller than that of the second opening 4320 shown in FIG. 30, and the opening area of the second opening 4320 shown in FIG. 32 is smaller than that of the second opening 4320 shown in FIG. 31.

[0150] For example, in some embodiments, as shown in Table 3 and FIG. 6, compared with the optical structure in which the second air duct wall shown in FIG. 24A is located, in the optical structure in which the second air duct wall shown in FIGS. 30-32 is located, as the opening area of the second opening 4320 gradually decreases, the temperature of the display panel 202 and the heat insulation element 206 gradually increases. At the same time, as the opening area of the second opening 4320 gradually decreases, the air flow rate in the first channel C1 and the second channel C2 gradually decreases, and the decrease is relatively large. For example, compared with the optical structure in which the second air duct wall CV2 shown in FIG. 24A is located, in the optical structure in which the second air duct wall CV2 shown in FIG. 32 is located, the air speed of the first channel C1 decreases by 0.51 m / s, the air speed of the second channel C2 decreases by 0.61 m / s, the temperature of the display panel 202 increases by 2.8°C, and the temperature of the heat insulation element 206 increases by 3°C.

[0151] According to the simulation results shown in FIGS. 26A-29B, when the opening area of the first opening 4310 is reduced, it is not conducive to stabilize the air flow rate, and the temperature of each device (for example, the display panel 202 and the heat insulation element 206) in the optical structure increases, which is not conducive to increasing the device life. Therefore, in order to make the optical structure have good performance, the opening area of the first opening 4310 can not be reduced, for example, the structure of the first opening 4310 in FIGS. 22-25 can be selected.

[0152] Table 3

[0153] In some embodiments, as shown in FIGS. 5 and 6, the optical structure 01 further includes a flow guide structure 500, and the flow guide structure 500 is located on a side of the display panel 202 away from the second air duct wall CV2. The flow guide structure 500 includes opposite first and second end portions 510 and 520, the first end portion 510 is connected with the display panel 202, and the second end portion 520 is directed to the air outlet surface S2 of the fan 205 to guide at least part of the air blown out from the air outlet surface S2 to between the display panel 202 and the second lens 203.

[0154] For example, in some embodiments, as shown in FIGS. 5 and 6, the first end portion 510 of the flow guide structure 500 can be connected with an edge of the display panel 202 close to the fan 205 through a connecting element, for example, the first end portion 510 and the edge of the display panel 202 close to the fan 205 are both clamped to the same connecting element to achieve connection, but embodiments of the present disclosure are not limited thereto. For example, the airflow flowing out from the air outlet surface S2 of the fan 205 can be divided by the flow guide structure 500, so that part of the airflow enters the third channel C3, and part of the airflow enters the first channel C1 and the second channel C2, so that the flow guide structure 500 can reasonably distribute the air flow to make the airflow have a stable flow state in different channels.

[0155] For example, in some embodiments, as shown in FIG. 5 and FIG. 6, the cross section of the flow guide structure 500 along the second plane A2 is arc-shaped. For example, the second plane A2 is perpendicular to the first plane A1, and the second plane A2 is parallel to the first direction X. For example, the second plane A2 can be the plane in which the first direction X and the second direction Z lie. In this way, the wind deflected by the flow guide structure 500 can be smoothly guided to the third channel C3 to exchange heat with the display panel 202, thereby improving the heat dissipation efficiency.

[0156] For example, in some embodiments, as shown in FIG. 5 and FIG. 6, the orthographic projection of the flow guide structure 500 on the first plane A1 can not overlap with the orthographic projection of the second lens 203 on the first plane A1. For example, the distance between the flow guide structure 500 and the surface of the fan 205 close to the second air duct wall CV2 is smaller than the distance between the flow guide structure 500 and the surface of the fan 205 away from the second air duct wall CV2. For example, the second end portion 520 of the flow guide structure 500 points to the side close to the second air duct wall CV2 of the middle portion of the air outlet surface S2. For example, the second end portion 520 of the flow guide structure 500 is close to the air outlet surface S2 of the fan 205, and does not contact the air outlet surface S2, thereby enabling the airflow flowing out of the air outlet surface S2 to be quickly divided by the flow guide structure 500, facilitating the control of the airflow into the third channel C3, and enabling the flow guide structure 500 to have reasonable installation space. For example, in some embodiments, as shown in FIG. 5 and FIG. 6, the included angle λ between the two end portions of the flow guide structure 500 can be 80°-90°, for example, the included angle λ between the tangent plane of the first end portion 510 and the tangent plane of the second end portion 520 is 80°-90°, for example, 80°-85°, 83°-86°, 84°-87°, or 86°-90°, which is not limited in the embodiments of the present disclosure.

[0157] For example, in some embodiments, in the first direction X, the minimum distance W between the flow guide structure 500 and the fan 205 is 1mm-1.5mm, for example, 1.2mm-1.4mm, 1.1mm-1.3mm, or 1.4mm-1.5mm, to further control the airflow into the third channel C3 and facilitate the heat dissipation effect of the airflow on each device.

[0158] In the embodiments of the present disclosure, the airflow flowing through the first channel C1 can reduce the temperature of the first lens 201 and the heat insulation element 206, the airflow flowing through the second channel C2 can reduce the temperature of the heat insulation element 206 and the display panel 202, and the airflow flowing through the third channel C3 can reduce the temperature of the display panel 202 and the second lens 203, thereby better improving the heat dissipation effect of the display cavity 200 as a whole through the three air guide channels.

[0159] FIGS. 36A-37B are simulation analysis results of the optical structure according to an embodiment of the present disclosure; and Table 4 is a summary table of the results corresponding to the results of FIGS. 36A-37B. For example, FIGS. 37A and 37B are the results of the optical structure shown in FIG. 6 (i.e., provided with a flow guide structure), and the simulation results are shown in Table 4 corresponding to the results of serial number 2; and FIGS. 36A and 36B are the results of the optical structure shown in FIG. 6 (i.e., not provided with a flow guide structure), and the simulation results are shown in Table 4 corresponding to the results of serial number 1.

[0160] For example, as shown in FIGS. 6, 36A-37B, when the optical structure according to an embodiment of the present disclosure is simulated, the first distance A in the optical structure satisfies: A = 9.0, the distance B satisfies: B = 9.2, the second distance C satisfies: C = 7.2, and the fluid in the optical structure is air.

[0161] For example, as shown in Table 4, FIGS. 6, 36A-37B, after the air guide structure 500 is provided, the air flow rate in the first channel C1 and the air flow rate in the third channel C3 are both increased, and the air flow rate in the second channel C2 is slightly decreased, but the decrease is small. The temperature of the heat insulation element 206 and the display panel 202 is decreased, and therefore, after the air guide structure 500 is provided, the heat dissipation effect of the heat insulation element 206 and the display panel 202 and other devices is improved, and the service life of each device is improved.

[0162] Table 4

[0163] FIGS. 38-39B are structural schematic diagrams of the first air duct wall according to at least one embodiment of the present disclosure.

[0164] For example, as shown in FIGS. 1, 5, and 38, the first air duct wall CV1 of the optical structure 01 further includes a side cover portion 320. The side cover portion 320 is located on the side of the reflector 204 away from the display panel 202, for example, the side cover portion 320 can be used as a side shell of the optical structure 01. For example, in some embodiments, the first air duct wall is an integrated structure. For example, the first air duct wall can be made of one material and by one process. In this way, the structure of the optical structure is simplified, the installation difficulty is reduced, and the gas can be fully exchanged with the first air duct wall CV1 to improve the heat dissipation efficiency.

[0165] For example, as shown in FIGS. 39A and 39B, the side cover part 320 of the first air duct wall CV1 includes a side wall 3201, and a plurality of first heat dissipation structures 3210 and a plurality of second heat dissipation structures 3220 connected to the side wall 3201 respectively. The plurality of first heat dissipation structures 3210 are located in the second cavity U2 (as shown in FIG. 5), and the plurality of second heat dissipation structures 3220 are located on the side of the side wall 3201 away from the second cavity U2, and the plurality of first heat dissipation structures 3210 are adjacent to the reflector 204 and are arranged at intervals.

[0166] For example, as shown in FIGS. 1 and 39A, the plurality of first heat dissipation structures 3210 and the plurality of second heat dissipation structures 3220 are located on both sides of the side wall 3201 respectively. The plurality of first heat dissipation structures 3210 adjacent to the reflector 204 means that no other devices, such as heat sinks, are arranged between the plurality of first heat dissipation structures 3210 and the reflector 204, so that the air flow located in the second cavity U2 can be heat dissipated with the plurality of first heat dissipation structures 3210 to reduce the temperature. Therefore, by arranging the first air duct wall CV1 in this way, other heat dissipation devices, such as heat sinks, located in the second cavity U2 can be reduced, and the plurality of first heat dissipation structures 3210 can be used as “in-cavity heat sinks”, so that the first air duct wall CV1 has a more powerful heat dissipation function, which is conducive to enhancing the heat exchange between the air flow and the outside to strengthen the heat dissipation effect, and at the same time, the internal structure of the optical structure is simplified.

[0167] For example, in some embodiments, as shown in FIGS. 21A, 21B and 39A, the plurality of first heat dissipation structures 3210 of the first air duct wall CV1 can include a plurality of first heat dissipation columns 3221 arranged in multiple rows and multiple columns. For example, as shown in FIG. 21A, the plurality of first heat dissipation columns 3221 are in cylindrical shape, and in some embodiments, the first heat dissipation columns 3221 can also be in prismatic shape.

[0168] For example, in some embodiments, as shown in FIG. 21A, the distance Q between the first heat dissipation structure 3210 and the reflector 204 is 2mm-3mm, such as 2.2mm, 2.4mm, 2.5mm, 2.6mm or 2.8mm, which is conducive to the flow of air flow between the first heat dissipation structure 3210 and the reflector 204 to enhance the heat exchange capacity.

[0169] For example, in some embodiments, as shown in FIGS. 21A and 21B, the plurality of first heat dissipation columns 3221 arranged in multiple rows and multiple columns can include an Nth row of first heat dissipation columns 3221 and an (N+1)th row of first heat dissipation columns 3221, and the Nth row of first heat dissipation columns 3221 and the (N+1)th row of first heat dissipation columns 3221 are arranged in staggered manner in the row direction, and N is a positive integer greater than or equal to 1. For example, the row direction can be the R1 direction in FIG. 21B, and the column direction can be the R2 direction in the figure, and in other embodiments, the row direction and the column direction can also be interchanged.

[0170] For example, if N is a positive integer such as 1, 2, 3, 4, or 5, then the first heat dissipation columns 3221 in each adjacent row are staggered in the row direction. That is, the first heat dissipation column 3221 in the Nth row and the first heat dissipation column 3221 in the (N+1)th row are not aligned in the column direction. For example, the first heat dissipation column 3221 in the (N+1)th row corresponds to the position between the first and second heat dissipation columns 3221 in the Nth row. Alternatively, the first heat dissipation column 3221 in the Nth row and the first heat dissipation column 3221 in the (N+2)th row are aligned in the row direction.

[0171] For example, in some embodiments, as shown in Figures 21A and 21B, the first heat dissipation columns 3221 arranged in multiple rows and columns may include the first heat dissipation column 3221 in the Mth column and the first heat dissipation column 3221 in the (M+1)th column, and the first heat dissipation column 3221 in the Mth column and the first heat dissipation column 3221 in the (M+1)th column are staggered in the column direction, where M is a positive integer greater than or equal to 1. For example, M is a positive integer such as 1, 2, 3, 4, or 5. In this case, every two adjacent columns of the first heat dissipation columns 3221 are staggered in the column direction, that is, the first first heat dissipation column 3221 in the Mth row and the first first heat dissipation column 3221 in the (M+1)th row are not aligned in the column direction. For example, the first first heat dissipation column 3221 in the (M+1)th row corresponds to the position between the first and second first heat dissipation columns 3221 in the Mth row. For example, the first heat dissipation column 3221 in the Mth row and the first heat dissipation column 3221 in the M+2th row are aligned in the row direction.

[0172] This allows the airflow to fully contact the surface of each first heat dissipation column 3221, carrying away the heat from multiple first heat dissipation columns 3221 and enhancing the heat dissipation effect.

[0173] For example, in some embodiments, as shown in FIG21, the heights of the plurality of first heat dissipation structures 3210 of the first air duct wall CV1 may be different. For example, the heights of the plurality of first heat dissipation columns 3221 relative to the side wall 3201 may be different. For example, when the plurality of first heat dissipation columns 3221 are arranged in multiple rows and columns, the heights of adjacent rows of first heat dissipation columns 3221 relative to the side wall 3201 may be different, so that the airflow path can be extended, so that the airflow can carry away more heat during the flow process.

[0174] For example, in some embodiments, as shown in FIG. 39A, the plurality of second heat dissipation structures 3220 can also include second heat dissipation columns 3222 arranged in multiple rows and multiple columns. For example, the arrangement and height setting of the plurality of second heat dissipation columns 3222 can refer to the above-mentioned related descriptions of the first heat dissipation columns 3221, and will not be repeated here, so as to enhance the flow path of the airflow flowing along the surface of the plurality of second heat dissipation columns 3222, so as to take away more heat.

[0175] For example, in some embodiments, as shown in FIG. 39A, the plurality of first heat dissipation structures 3210 can include a plurality of first heat dissipation strips 3231 arranged at intervals. For example, the plurality of first heat dissipation strips 3231 can be uniformly arranged at the same pitch, and the pitch between adjacent first heat dissipation strips 3231 refers to the distance between the centers of adjacent first heat dissipation strips 3231. For example, in some embodiments, the pitch between adjacent first heat dissipation strips 3231 can be 7mm-8mm, such as 7.2mm, 7.3mm, 7.5mm or 7.8mm, etc., so that the airflow can flow smoothly and take away more heat.

[0176] For example, in some embodiments, as shown in FIG. 39A, the included angle between the first heat dissipation strip 3231 and the side wall 3201 can be 85°-90°, and the included angle between the first heat dissipation strip 3231 and the side wall 3201 shown in FIG. 39A is 90°. For example, in some embodiments, the included angle between the first heat dissipation strip 3231 and the side wall 3201 can also be less than 90°, that is, the first heat dissipation strip 3231 can be arranged inclined to the side wall 3201. For example, the inclination direction of the plurality of first heat dissipation strips 3231 relative to the side wall 3201 is the same, for example, and the inclination angle of the first heat dissipation strip 3231 relative to the side wall 3201 is 85°, 86°, 87° or 89°, etc. As shown in FIG. 5 and FIG. 39A, when the plurality of first heat dissipation strips 3231 are inclined relative to the side wall 3201, on the one hand, the occupied space of the second cavity U2 can be saved, thereby facilitating the miniaturization design of the optical structure 01; on the other hand, the path of the airflow flowing along the surface of the first heat dissipation strip 3231 can be prolonged, thereby facilitating the enhancement of the heat exchange effect.

[0177] For example, in some embodiments, as shown in FIG. 39A, the second heat dissipation structure 3220 can also include a plurality of second heat dissipation strips 3232 arranged at intervals. For example, the arrangement of the plurality of second heat dissipation structures 3220 can refer to the above-mentioned related descriptions of the first heat dissipation structure, and will not be repeated here, so as to enhance the flow path of the airflow flowing along the surface of the plurality of second heat dissipation structures 3220, so as to take away more heat.

[0178] For example, in some embodiments, as shown in FIG. 5 and FIG. 39A, the first air duct wall CV1 further comprises a plurality of third heat dissipation structures 3230 located on the inner wall of the first air duct wall CV1 close to the cavity U0. For example, as shown in FIG. 39A, the third heat dissipation structure 3230 in the first air duct wall CV1 comprises a plurality of third heat dissipation strip gratings 3233 arranged in a row. For example, the plurality of third heat dissipation strip gratings 3233 comprises a first sub-heat dissipation strip grating 3301 and a second sub-heat dissipation strip grating 3302, the first sub-heat dissipation strip grating 3301 is closer to the middle of the first air duct wall CV1 than the second sub-heat dissipation strip grating 3302, and the extension length of the first sub-heat dissipation strip grating 3301 is smaller than that of the second sub-heat dissipation strip grating 3302. For example, in some embodiments, the first air duct wall CV1 comprises a plurality of first sub-heat dissipation strip gratings 3301 and second sub-heat dissipation strip gratings 3302 located on both sides of the plurality of first sub-heat dissipation strip gratings 3301, for example, FIG. 39A illustrates an example in which two second sub-heat dissipation strip gratings 3302 are arranged on both sides of the plurality of first sub-heat dissipation strip gratings 3301, but the embodiments of the present disclosure are not limited thereto. By making the first air duct wall CV1 comprise first sub-heat dissipation strip gratings 3301 and second sub-heat dissipation strip gratings 3302 with different extension lengths, the disturbance to the airflow can be enhanced, and the second sub-heat dissipation strip gratings 3302 have a larger contact area with the airflow, thereby more facilitating the airflow to carry away more heat during the flow process, so as to facilitate the dissipation of heat on both sides of the middle of the first air duct wall CV1.

[0179] For example, in some embodiments, as shown in FIG. 39A, the first heat dissipation structure 3210 of the first air duct wall CV1 further comprises a connecting structure 3250, and adjacent first heat dissipation structures 3210 (for example, adjacent first heat dissipation strip gratings 3231) can be connected through the connecting structure 3250. For example, at least part of the connecting structure 3250 can be located between adjacent first heat dissipation strip gratings 3231. The plurality of first heat dissipation strip gratings 3231 can comprise adjacent first heat dissipation strip grating portions 3241 and second heat dissipation strip grating portions 3242, the first heat dissipation strip grating portions 3241 comprise first opening portions 4351, and the second heat dissipation strip grating portions 3242 comprise second opening portions (not shown in the figure, refer to the structure of the first opening portion 4351), and the connecting structure 3250 can be inserted into the first opening portion 4351 and the second opening portion. For example, the first opening portion 4351 penetrates the first heat dissipation strip grating portion 3241, and the second opening portion penetrates the second heat dissipation strip grating portion 3242, so that when the connecting structure 3250 is inserted into the first opening portion 4351 and the second opening portion, the first heat dissipation strip grating portion 3241 and the second heat dissipation strip grating portion 3242 can be connected. In this way, the disturbance to the airflow can be enhanced through the connecting structure 3250, and the flow path of the airflow can be prolonged to achieve good heat dissipation effect.

[0180] For example, as shown in FIG. 39A, the connecting structure 3250 can be in a plate shape, and be in a one-piece structure. The minimum distance between the connecting structure 3250 and the end of the first heat dissipation strip grid 3231 away from the side wall 3201 is G, which can be, for example, 10-15 mm, 12-16 mm, 14-18 mm, or 17-20 mm, so that the disturbance to the airflow can be enhanced at different positions according to design needs, and the corresponding heat dissipation effect can be achieved.

[0181] For example, in some embodiments, referring to FIG. 39A, the connecting structure 3250 can include a plurality of connecting blocks (see FIG. 41B for the connecting blocks 3250), which are sequentially and spacedly arranged along the arrangement direction of the plurality of first heat dissipation strip grids 3231, and each connecting block is located between adjacent first heat dissipation strip grids 3231. For example, the plurality of connecting blocks of the connecting structure 3250 are arranged in a row, and each connecting block is in contact with the first heat dissipation strip grids 3231 on both sides thereof and is clamped between the first heat dissipation strip grids 3231 on both sides thereof to achieve fixation.

[0182] For example, in some embodiments, referring to FIG. 39A, the first air duct wall CV1 can include 2-6 connecting structures 3250, such as 2, 3, 4, 5, or 6, and adjacent connecting structures 3250 are spacedly arranged. That is, a plurality of rows (for example, 2-6 rows) of connecting blocks can be arranged in the first air duct wall CV1, so that the degree of disturbance to the airflow can be further enhanced, and the heat dissipation capacity can be enhanced. For example, the distance between adjacent connecting structures 3250 can be 4-8 mm, such as 4-5 mm, 5-6 mm, or 7-8 mm, which can be set according to design needs.

[0183] For example, in some embodiments, referring to FIG. 39A, the distance G of the plurality of connecting blocks in the same connecting structure 3250 to the end of the first heat dissipation strip grid 3231 can be different, for example, a part of the connecting structures 3250 is closer to the root of the first heat dissipation strip grid 3231 (i.e., the end close to the side wall 3201), and a part of the connecting structures 3250 is closer to the end of the first heat dissipation strip grid 3231 away from the side wall 3201, so that the flow path of the airflow can be more flexibly changed.

[0184] FIGS. 40A-46B are simulation analysis results of optical structures according to embodiments of the present disclosure; and FIG. 47 is a result summary diagram corresponding to the diagrams in FIGS. 40A-46B. In FIG. 47, the horizontal axis represents the number of connecting structures in the first heat dissipation structure 3210, and the vertical axis represents the highest temperature of the first heat dissipation bars 3231. For example, FIGS. 40A-46B are corresponding to the optical structure shown in FIGS. 1 and 39A, and the temperatures of the second heat dissipation structure 3220 and the third heat dissipation structure 3230 of the optical structure are both about 38°C.

[0185] For example, as shown in FIGS. 40A, 40B, and 47, the first heat dissipation structure 3210 of the first air duct wall CV1 is not provided with a connecting structure, and a plurality of first heat dissipation bars 3231 are sequentially and spacedly arranged. Along the arrangement direction of the plurality of first heat dissipation bars 3231, the thickness of the first heat dissipation bars 3231 is 1 mm, and the number of the plurality of first heat dissipation bars 3231 is 20. As shown in FIG. 40A, the temperature of the first heat dissipation bars 3231 is relatively high, and the highest temperature reaches 50.9°C, which indicates that the heat of the plurality of first heat dissipation structures 3210 located in the second cavity U2 (see FIG. 5) is not quickly transferred out of the second cavity U2.

[0186] For example, as shown in FIGS. 41A, 41B, and 47, the first heat dissipation structure 3210 of the first air duct wall CV1 is provided with one connecting structure 3250 including a plurality of connecting blocks, and a plurality of first heat dissipation bars 3231 are sequentially and spacedly arranged. Along the arrangement direction of the plurality of first heat dissipation bars 3231, the thickness of the first heat dissipation bars 3231 is 1 mm, and the number of the plurality of first heat dissipation bars 3231 is 20. As shown in FIG. 41A, the temperature of the first heat dissipation bars 3231 is slightly decreased, and the highest temperature is 47°C, which indicates that part of the heat of the plurality of first heat dissipation structures 3210 located in the second cavity U2 (see FIG. 5) is transferred out of the second cavity U2.

[0187] For example, as shown in FIGS. 42A, 42B, and 47, the first heat dissipation structure 3210 of the first air duct wall CV1 is provided with two connecting structures 3250 including a plurality of connecting blocks, and a plurality of first heat dissipation bars 3231 are sequentially and spacedly arranged. Along the arrangement direction of the plurality of first heat dissipation bars 3231, the thickness of the first heat dissipation bars 3231 is 1 mm, and the number of the plurality of first heat dissipation bars 3231 is 20. As shown in FIG. 42A, the temperature of the first heat dissipation bars 3231 is continuously decreased, and the highest temperature is 46.5°C, which indicates that the heat of the plurality of first heat dissipation structures 3210 located in the second cavity U2 (see FIG. 5) is further transferred out of the second cavity U2 compared with FIGS. 41A and 41B.

[0188] For example, as shown in FIGS. 43A, 43B and 47, the first heat dissipation structure 3210 of the first air duct wall CV1 is provided with three connecting structures 3250, and the rest of the structures are the same as the optical structure corresponding to FIG. 41A. As shown in FIG. 43A, the temperature of the first heat dissipation strip grid 3231 continues to drop, and the highest temperature is 46.4°C, which is 0.1°C lower than that of FIGS. 42A and 42B.

[0189] For example, as shown in FIGS. 44A, 44B and 47, the first heat dissipation structure 3210 of the first air duct wall CV1 is provided with four connecting structures 3250, and the rest of the structures are the same as the optical structure corresponding to FIG. 41A. As shown in FIG. 44A, the temperature of the first heat dissipation strip grid 3231 continues to drop, and the highest temperature is 46.2°C, which is 0.2°C lower than that of FIGS. 43A and 43B.

[0190] For example, as shown in FIGS. 45A, 45B and 47, the first heat dissipation structure 3210 of the first air duct wall CV1 is provided with five connecting structures 3250, and the rest of the structures are the same as the optical structure corresponding to FIG. 41A. As shown in FIG. 45A, the temperature of the first heat dissipation strip grid 3231 continues to drop, and the highest temperature is 46.1°C, which is 0.1°C lower than that of FIGS. 44A and 44B.

[0191] For example, as shown in FIGS. 46A, 46B and 47, the first heat dissipation structure 3210 of the first air duct wall CV1 is provided with six connecting structures 3250, and the rest of the structures are the same as the optical structure corresponding to FIG. 41A. As shown in FIG. 46A, the temperature of the first heat dissipation strip grid 3231 continues to drop, and the highest temperature is 46°C, which is 0.1°C lower than that of FIGS. 45A and 45B.

[0192] According to the simulation results described above, compared with not setting the connecting structure 3250, the highest temperature of the first heat dissipation structure 3210 of the first air duct wall CV1 obviously decreases after setting one connecting structure 3250, but the highest temperature of the first heat dissipation strip grid 3231 changes little when the first heat dissipation structure 3210 of the first air duct wall CV1 is provided with 2-6 connecting structures 3250. Since too many connecting structures 3250 will increase the difficulty of production, therefore, considering comprehensively, the scheme of setting two connecting structures 3250 in the first heat dissipation structure 3210 can be selected.

[0193] For example, in the embodiments of the present disclosure, the display panel 202 can be a liquid crystal display panel (LCD), or an electronic ink panel, or a display panel with similar functions. The first air duct wall CV1 and the second air duct wall CV2 can be covers formed of metal materials such as cast aluminum materials or alloy materials, so as to have better heat dissipation effects. The first lens 201 and the second lens 203 can be various lens structures that can adjust light, such as convex lenses, concave lenses, Fresnel lenses, and the like. The embodiments of the present disclosure do not limit the specific forms of the first lens 201 and the second lens 203. The first fan 205 can be various fans such as centrifugal fans, and the embodiments of the present disclosure do not limit the structures of the fans. The heat dissipation structures such as the first heat dissipation structure 3210 and the second heat dissipation structure 3220 can be formed of metal materials or alloy materials, such as copper or copper alloys, and the embodiments of the present disclosure do not limit the materials of the structures.

[0194] The embodiments of the present disclosure provide a projection device, which includes the optical structure provided by the embodiments of the present disclosure. The projection device can have better heat dissipation effects and display effects.

[0195] The following points need to be explained:

[0196] (1) The drawings of the embodiments of the present disclosure only involve the structures involved in the embodiments of the present disclosure, and other structures can be referred to the general design.

[0197] (2) For the purpose of clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness of a layer or region is exaggerated or reduced, that is, the drawings are not drawn according to the actual proportions. It can be understood that when an element is referred to as being located “on” or “under” another element, the element can be “directly” located on or under another element or there can be an intermediate element.

[0198] (3) In the case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined to obtain new embodiments.

[0199] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. An optical structure, comprising a light source assembly and a display assembly, wherein the display assembly is located on the light exit side of the light source assembly, the display assembly comprises a first lens, a display panel, a second lens and a reflector arranged in sequence along a first direction, the first lens is closer to the light source assembly than the display panel, the optical structure further comprises a fan, a first air duct wall and a second air duct wall, in a second direction, the fan and the first air duct wall are respectively located on opposite sides of the display assembly, and the second air duct wall is located on the side of the display assembly close to the first air duct wall, the first direction is different from the second direction, the first air duct wall comprises a first connecting portion, one end of the first connecting portion extends to the contour edge of the first lens, the second air duct wall comprises a second connecting portion, one end of the second connecting portion extends to the contour edge of the display panel, the first connecting portion and the second connecting portion in the first plane are both overlapped with the second lens in the first plane, and the first plane is a plane perpendicular to the second direction, the minimum distance between the first connecting portion and the second connecting portion in the second direction is a first distance A mm, the minimum distance between the second lens and the second connecting portion in the second direction is a second distance C mm, the minimum distance between the first lens and the display panel in the first direction is M mm, the minimum distance between the display panel and the second lens in the first direction is N mm, 0.3 x M≤A≤12, 4.2≤C≤N.

2. The optical structure of claim 1, wherein, 0.62 x M≤A≤12, 4.2≤C≤0.804 x N.

3. The optical structure of claim 1 or 2, wherein, The first distance A and the second distance C satisfy: 15.5≤A+C≤16.

5.

4. The optical structure according to any one of claims 1 to 3, wherein, The first distance A satisfies: 7.0≤A≤10.

0.

5. The optical structure according to any one of claims 1 to 4, wherein, The first air duct wall further comprises a first extension portion, the first extension portion is located on the side of the reflector away from the fan, and at least part of the first extension portion is parallel to the first plane, the first extension portion in the first plane is at least partially overlapped with the reflector in the first plane, the second cover plate further comprises a second extension portion, the second extension portion is located on the side of the reflector away from the fan, and at least part of the second extension portion is parallel to the first plane, the second extension portion in the first plane is at least partially overlapped with the reflector in the first plane; In the second direction, the minimum distance between the first extension portion and the second extension portion is B mm, wherein B>A, and / or B>C. The minimum distance B between the first extension portion and the second extension portion satisfies: 9.0≤B≤13.

0.

6. The optical structure of claim 5, wherein, ​ 7. The optical structure of claim 3, wherein, The first air duct wall further comprises a first inclined portion, the first extension portion is connected with the first connecting portion through the first inclined portion, the first inclined portion comprises opposite first and second ends, the first end is connected with the first connecting portion, the second end is connected with the first extension portion, and the first end is farther away from the fan than the second end, The second air duct wall further comprises a second inclined portion, the second extension portion is connected with the second connecting portion through the second inclined portion, the second inclined portion comprises opposite third and fourth ends, the third end is connected with the second connecting portion, the fourth end is connected with the second extension portion, and the third end is farther away from the fan than the fourth end, An angle between the first inclined portion and the first plane is a first included angle, an angle between the second inclined portion and the first plane is a second included angle, and a ratio of the second included angle to the first included angle is 1.5-3.

8. The optical structure of claim 7, wherein, The first included angle is 20-30 degrees, and / or the second included angle is 40-50 degrees.

9. The optical structure according to any one of claims 1 to 7, wherein, The first connecting portion comprises a first sub-connecting portion and a second sub-connecting portion, the first sub-connecting portion is connected with the second sub-connecting portion, the second sub-connecting portion is farther away from the first lens than the first sub-connecting portion, and a surface of the first sub-connecting portion facing the second lens is in a first arc shape; and / or The second connecting portion comprises a third sub-connecting portion and a fourth sub-connecting portion, the third sub-connecting portion is connected with the fourth sub-connecting portion, the fourth sub-connecting portion is farther away from the display panel than the third sub-connecting portion, and a surface of the third sub-connecting portion facing the second lens is in a second arc shape.

10. The optical structure of claim 9, wherein, A radius of curvature of the first arc shape is greater than a radius of curvature of the second arc shape.

11. The optical structure of claim 9 or 10, wherein, The radius of curvature of the first arc shape is 15-18 mm, and the radius of curvature of the second arc shape is 5-10 mm.

12. The optical structure according to any one of claims 1 to 11, wherein, The second extension portion of the second air duct wall comprises a first extension piece and a second extension piece, and a connecting piece between the first extension piece and the second extension piece, an end of the reflector away from the fan is at least partially in contact with the connecting piece, The reflector and the second lens have a first cavity, a side of the reflector away from the first cavity has a second cavity, and the first air duct wall and the second air duct wall have a third cavity, The first extension piece has at least one first opening, the second extension piece has at least one second opening, the first cavity and the third cavity are communicated through the first opening, and the second cavity and the third cavity are communicated through the second opening, An opening area of the at least one first opening is smaller than an opening area of the at least one second opening.

13. The optical structure of claim 12, wherein, The opening area of the at least one first opening is 9.0%-19% of the opening area of the at least one second opening.

14. The optical structure of claim 12 or 13, wherein, The opening area of the at least one first opening is 12%-16% of the opening area of the at least one second opening.

15. The optical structure according to any one of claims 12 to 14, further comprising a heat dissipating element located in the second cavity, wherein, The at least one second opening has a projection area on the first plane that is greater than a projection area of the heat dissipation element on the first plane.

16. The optical structure of claim 12 or 15, wherein the number of the first openings is greater than the number of the second openings.

17. The optical structure of any one of claims 12-16, wherein, a projection of the first opening on the first plane is a sector, a circle, an ellipse, or a polygon; a projection of the second opening on the first plane is a sector, a circle, an ellipse, or a polygon.

18. The optical structure of claim 12, wherein, The connecting part of the second air duct wall comprises a first edge close to the second opening, the second inclined part of the second air duct wall comprises a second edge close to the second opening, the extending direction of the first edge intersects with the extending direction of the second edge, and the included angle between the extending direction of the first edge and the extending direction of the second edge is an acute angle, The at least one first opening in the first extending part is arranged along the first edge.

19. The optical structure of claim 18, wherein, The first extending part has a plurality of the first openings, and the plurality of the first openings are arranged along the first edge; and / or the second extending part has one second opening, and the first edge is at least part of the edge of the second opening close to the first extending part. The maximum dimension of the second opening in the extending direction of the first edge is a first dimension, and the maximum dimension of the second opening perpendicular to the extending direction of the first edge is a second dimension, and the first dimension is greater than the second dimension.

20. The optical structure according to any one of claims 1 to 19, wherein, The first lens and the second lens have a flow passage therebetween, and the dimension of the flow passage in the first direction is less than the dimension of the fan in the second direction.

21. The optical structure of claim 20, further comprising a thermal isolation element located between the first lens and the display panel, wherein, In the first direction, the distance between the first lens and the heat insulation element is M1, the distance between the heat insulation element and the display panel is M2, the distance between the display panel and the second lens is N, and the dimension of the fan in the second direction is F, and M1+M2+N<F.

22. The optical structure according to any one of claims 1 to 21, wherein, The first air duct wall further comprises a side cover part, the side cover part is located on the side of the reflector away from the display panel, the side cover part comprises a side wall and a plurality of first heat dissipation structures and a plurality of second heat dissipation structures connected to the side wall, The reflector and the second lens have a first cavity therebetween, the side of the reflector away from the first cavity has a second cavity, the plurality of first heat dissipation structures are located in the second cavity, the plurality of second heat dissipation structures are located on the side of the side wall away from the second cavity, and the plurality of first heat dissipation structures are adjacent to and spaced apart from the reflector.

23. The optical structure of claim 22, wherein, The first air duct wall is an integral structure.

24. The optical structure of claim 22 or 23, wherein, The distance between the first heat dissipation structure and the reflector is 2-3 mm.

25. The optical structure of any of claims 22-24, wherein, The heights of the plurality of first heat dissipation structures are not the same.

26. The optical structure of claim 22 or 23, wherein, The plurality of first heat dissipation structures comprise a plurality of first heat dissipation columns arranged in multiple rows and multiple columns, or the plurality of first heat dissipation structures comprise a plurality of first heat dissipation strips arranged at intervals; and / or The plurality of second heat dissipation structures comprises second heat dissipation columns arranged in multiple rows and multiple columns, or the second heat dissipation structures comprise multiple second heat dissipation fins arranged at intervals.

27. The optical structure of claim 26, wherein, The plurality of first heat dissipation structures comprises first heat dissipation columns arranged in multiple rows and multiple columns, the multiple rows and multiple columns of first heat dissipation columns comprise an Nth row of first heat dissipation columns and an (N+1)th row of first heat dissipation columns, the Nth row of first heat dissipation columns and the (N+1)th row of first heat dissipation columns are arranged in staggered manner in the row direction, N is a positive integer greater than or equal to 1; and / or The multiple rows and multiple columns of first heat dissipation columns comprise an Mth column of first heat dissipation columns and an (M+1)th column of first heat dissipation columns, the Mth column of first heat dissipation columns and the (M+1)th column of first heat dissipation columns are arranged in staggered manner in the column direction, M is a positive integer greater than or equal to 1.

28. The optical structure of any of claims 22-25, wherein, The plurality of first heat dissipation structures comprises multiple first heat dissipation fins arranged at intervals and a connecting structure, adjacent first heat dissipation fins are connected by the connecting structure.

29. The optical structure of claim 28, wherein, The plurality of first heat dissipation fins comprises adjacent first heat dissipation fin portions and second heat dissipation fin portions, the first heat dissipation fin portions comprise first opening portions, the second heat dissipation fin portions comprise second opening portions, the connecting structure is inserted into the first opening portions and the second opening portions to connect the first heat dissipation fin portions and the second heat dissipation fin portions.

30. The optical structure of claim 28 or 29, wherein, The minimum distance between the connecting structure and the end of the first heat dissipation fin away from the side wall is 10mm-20mm.

31. The optical structure of claim 28, wherein, The connecting structure comprises multiple connecting blocks, the multiple connecting blocks are arranged at intervals in sequence along the arrangement direction of the multiple first heat dissipation fins, and the connecting blocks are located between adjacent first heat dissipation fins.

32. The optical structure of any of claims 28-31, wherein, The included angle between the first heat dissipation fin and the side wall is 85°-90°.

33. A projection device comprising the optical structure according to any one of claims 1-32.

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