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 Art

[0002] Currently, 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. LCD projection devices mainly include single LCD projection devices and triple LCD projection devices.

[0003] Projection devices project images or videos onto a screen. They connect to computers, game consoles, televisions, and other devices via various interfaces to play the corresponding video signals. Projection devices are widely used in homes, offices, schools, and entertainment venues. For example, single-LCD projectors have a simple structure and low cost, making them suitable for middle and low-income groups, and therefore have considerable development prospects.

[0004] Summary of the Invention

[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-emitting side of the light source assembly, the display assembly includes 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 also includes a fan, a first air duct wall and a second air duct wall, in the 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 a 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 contour 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 contour edge of the display panel, the orthographic projection of the first connecting portion on the 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 perpendicular to the second direction plane, the minimum distance between the first connecting portion and the second connecting portion in the second direction is a first distance Amm, the minimum distance between the second lens and the second connecting portion in the second direction is a second distance Cmm, the minimum distance between the first lens and the display panel in the first direction is Mmm, the minimum distance between the display panel and the second lens in the first direction is Nmm, 0.3×M≤A≤12, 4.2≤C≤N.

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

[0007] For example, according to 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, according to 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, according to the optical structure provided by at least one embodiment of the present disclosure, the first duct wall also includes a first extension portion, the first extension portion is located on the side of the reflector away from the fan, and at least a portion of the first extension portion is parallel to the first plane, and the orthographic projection of the first extension portion on the first plane at least partially overlaps with the orthographic projection of the reflector on the first plane; the second cover plate also includes a second extension portion, the second extension portion is located on the side of the reflector away from the fan, and at least a portion of the second extension portion is parallel to the first plane, and the orthographic projection of the second extension portion on the first plane at least partially overlaps with the orthographic projection of the reflector on the first plane; in the second direction, the minimum distance between the first extension portion and the second extension portion is B mm, where B>A, and / or B>C.

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

[0011] For example, according to the optical structure provided by at least one embodiment of the present disclosure, the first air duct wall also includes a first inclined portion, the first extension portion is connected to the first connecting portion through the first inclined portion, the first inclined portion includes a first end and a second end relative to each other, the first end is connected to the first connecting portion, the second end is connected to the first extension portion, and the first end is farther away from the fan than the second end, the second air duct wall also includes a second inclined portion, the second extension portion is connected to the second connecting portion through the second inclined portion, the second inclined portion includes a third end and a fourth end relative to each other, the third end is connected to the second connecting portion, the fourth end is connected to the second extension portion, and the third end is farther away from the fan than the fourth end, the angle between the first inclined portion and the first plane is a first angle, the angle between the second inclined portion and the first plane is a second angle, and the ratio of the second angle to the first angle is 1.5 to 3.

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

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

[0014] For example, in the optical structure provided by at least one embodiment of the present disclosure, the radius of curvature of the first arc is greater than the radius of curvature of the second arc.

[0015] For example, in the optical structure provided by at least one embodiment of the present disclosure, the radius of curvature of the first arc is 15 mm to 18 mm, and the radius of curvature of the second arc is 5 mm to 10 mm.

[0016] For example, according to the optical structure provided by at least one embodiment of the present disclosure, the second extension portion of the second air duct wall includes a first extension member and a second extension member, and a connecting member located between the first extension member and the second extension member, the end of the reflector away from the fan is in at least partial contact with the connecting member, a first cavity is provided between the reflector and the second lens, a second cavity is provided on the side of the reflector away from the first cavity, a third cavity is provided between the first air duct wall and the second air duct wall, the first extension member has at least one first opening, the second extension member has at least one second opening, the first cavity and the third cavity are connected through the first opening, the second cavity and the third cavity are connected through the second opening, and the opening area of ​​the at least one first opening is smaller than the opening area of ​​the at least one second opening.

[0017] For example, in the optical structure provided by at least one embodiment of the present disclosure, the opening area of ​​the at least one first opening is 9.0% to 19% of the opening area of ​​the at least one second opening.

[0018] For example, in the optical structure provided by at least one embodiment of the present disclosure, the opening area of ​​the at least one first opening is 12% to 16% of the opening area of ​​the at least one second opening.

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

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

[0021] For example, according to the optical structure provided by at least one embodiment of the present disclosure, the orthographic projection of the first opening on the first plane is fan-shaped, circular, elliptical or polygonal; the orthographic projection of the second opening on the first plane is fan-shaped, circular, elliptical or polygonal.

[0022] For example, according to the optical structure provided by at least one embodiment of the present disclosure, the connecting member of the second air duct wall includes a first edge close to the second opening, the second inclined portion of the second air duct wall includes a second edge close to the second opening, the extension direction of the first edge intersects with the extension direction of the second edge, and the 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 member is arranged along the first edge.

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

[0024] For example, in the optical structure provided by at least one embodiment of the present disclosure, a circulation channel is provided between the first lens and the second lens, and a size of the circulation channel in the first direction is smaller than a size of the fan in the second direction.

[0025] For example, according to the optical structure provided by at least one embodiment of the present disclosure, the optical structure also includes a heat insulation element, which is 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 size of the fan in the second direction is F, then M1+M2+N<F.

[0026] For example, according to the optical structure provided by at least one embodiment of the present disclosure, the first air duct wall also includes a side cover portion, the side cover portion is located on the side of the reflector away from the display panel, the side cover portion includes a side wall and a plurality of first heat dissipation structures and a plurality of second heat dissipation structures connected to the side wall, a first cavity is provided between the reflector and the second lens, a second cavity is provided on the side of the reflector away from the first 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 the reflector and are arranged at intervals.

[0027] For example, according to the optical structure provided by at least one embodiment of the present disclosure, the first air duct wall is an integrated structure.

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

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

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

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

[0032] For example, in the optical structure provided by at least one embodiment of the present disclosure, the plurality of first heat dissipation structures include a plurality of first heat dissipation bars arranged at intervals and a connection structure, and adjacent first heat dissipation bars are connected by the connection structure.

[0033] For example, according to the optical structure provided by at least one embodiment of the present disclosure, the multiple first heat dissipation bar grids include adjacent first heat dissipation bar grid portions and second heat dissipation bar grid portions, the first heat dissipation bar grid portions include first opening portions, the second heat dissipation bar grid portions include second opening portions, and the connecting structure is inserted into the first opening portions and the second opening portions to connect the first heat dissipation bar grid portions and the second heat dissipation bar grid portions.

[0034] For example, in the optical structure provided by at least one embodiment of the present disclosure, a minimum distance between the connection structure and an end portion of the first heat dissipation rib away from the side wall is 10 mm to 20 mm.

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

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

[0037] At least one embodiment of the present disclosure further provides a projection device, which includes the optical structure provided by an embodiment of the present disclosure. BRIEF DESCRIPTION OF THE 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 in the following description only relate to some embodiments of the present disclosure, rather than limiting the present disclosure.

[0039] FIG1 is a schematic diagram of the overall structure of an optical structure provided by at least one embodiment of the present disclosure.

[0040] FIG2 is another schematic diagram of the overall structure of an optical structure provided by at least one embodiment of the present disclosure.

[0041] FIG3 is a top view of an optical structure provided by at least one embodiment of the present disclosure.

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

[0043] FIG5 is a schematic diagram of a cross-sectional structure of an optical structure provided by at least one embodiment of the present disclosure.

[0044] FIG6 is a schematic cross-sectional view of an optical structure provided by at least one embodiment of the present disclosure.

[0045] 7A to 16B are cloud diagrams of simulation analysis results of the optical structure provided in the embodiments of the present disclosure.

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

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

[0048] FIG19 is a schematic diagram of the internal structure of an optical structure provided by at least one embodiment of the present disclosure.

[0049] FIG20 is a front view of an optical structure provided by at least one embodiment of the present disclosure.

[0050] FIG21A is a schematic diagram of a cross-sectional structure of the optical structure in FIG20 taken along line BB.

[0051] FIG21B is a schematic diagram of a heat dissipation structure in an optical structure provided by at least one embodiment of the present disclosure.

[0052] FIG22 is a schematic diagram of a second air duct wall provided by at least one embodiment of the present disclosure.

[0053] FIG23 is a schematic diagram of another second air duct wall provided by at least one embodiment of the present disclosure.

[0054] FIG24A is a schematic diagram of yet another second air duct wall provided by at least one embodiment of the present disclosure.

[0055] FIG24B is a schematic diagram of yet another second air duct wall provided by at least one embodiment of the present disclosure.

[0056] FIG25 is a schematic diagram of yet another second air duct wall provided by at least one embodiment of the present disclosure.

[0057] 26A to 29B are cloud diagrams of simulation analysis results for the optical structure provided in the embodiments of the present disclosure.

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

[0059] 33A to 35B are cloud diagrams of simulation analysis results for the optical structure provided in the embodiments of the present disclosure.

[0060] 36A to 37B are cloud diagrams of simulation analysis results for the optical structure provided in the embodiments of the present disclosure.

[0061] 38 to 39B are schematic structural diagrams of a first air duct wall provided in at least one embodiment of the present disclosure.

[0062] 40A to 46B are cloud diagrams of simulation analysis results for the optical structure provided in the embodiments of the present disclosure.

[0063] FIG. 47 is a result summary diagram corresponding to the cloud diagrams in FIG. 40A to FIG. 46B . DETAILED DESCRIPTION

[0064] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0065] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0066] Typically, as the main structure of a projection device, the optical structure may include a light source cavity and a display cavity. For example, the light source cavity includes a light source that provides brightness, and the display cavity includes a display panel for forming a display image, such as a liquid crystal display panel.

[0067] During the study, the inventors of the present disclosure found that: the optical structure includes an internal circulation air duct, and the design of the internal circulation air duct of the optical structure (such as a horizontal optical structure) is a relatively core issue in projection equipment (such as projectors and other equipment) and is also a technical difficulty. Since the internal circulation air duct of the optical structure is usually in a relatively closed state, it dissipates heat by exchanging heat with the outside, and its heat dissipation efficiency is limited. Generally, the air in the internal circulation air duct circulates through flow, 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 (thermal conductivity is 90W / mK to 210W / mK). Therefore, during the long-term operation of the optical structure, its internal circulation air duct is likely to be in a high-temperature state for a long time, which will reduce the performance of each device located in the optical structure and shorten its life. It can be seen that it is very important to optimize the design of the internal circulation air duct of the optical structure.

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

[0069] 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 emitting side of the light source assembly, and the display assembly includes a first lens, a display panel, a second lens, and a reflector arranged in sequence along a first direction, wherein the first lens is closer to the light source assembly than the display panel, and the optical structure also includes a fan, a first air duct wall, and a second air duct wall. In the 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 a 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 contour edge of the first lens, and the second air duct wall It includes 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 the 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 Amm, the minimum distance between the second lens and the second connecting portion in the second direction is a second distance Cmm, the minimum distance between the first lens and the display panel in the first direction is Mmm, the minimum distance between the display panel and the second lens in the first direction is Nmm, 0.30×M≤A≤12, 4.2≤C≤N.

[0070] The embodiments of the present disclosure can optimize the structure of the internal circulation air duct of the optical structure to a good state by optimizing the minimum distance between the first connecting part and the second connecting part of the optical structure in the second direction, as well as the minimum distance between 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 world, and making the fan structure have a good heat dissipation effect.

[0071] In some embodiments, as shown in FIG1 and FIG4 , the optical structure 01 may 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 FIG4 , the light source assembly 100 may include a light source 101 and a light guide portion 102 located on the light emitting side (right side in the figure) of the light source 101, such as a light cup assembly. The light guide portion 102 is configured to fully diffuse the light emitted by the light source 101 to the display cavity 200. For example, the light source 101 may be a light source in various forms, such as a light emitting diode (LED), an energy-saving lamp, a Mini-LED (generally with a size between 50 μm and 300 μm), and a Micro-LED (generally with a size less than 50 μm).

[0072] As shown in FIG4 , the display assembly 200 is located on the light-emitting side of the light source assembly 100. The display assembly 200 includes a first lens 201, a display panel 202, a second lens 203, and a reflector 204, which are sequentially arranged along a first direction X. The first lens 201 is closer to the light source assembly 100 than the display panel 202. Light emitted from the light source cavity 10 can sequentially pass through the first lens 201, the display panel 202, the second lens 203, and the reflector 204 to the projection outlet EX, thereby realizing projection display. For example, the reflector 204 is configured to reflect light emitted from the second lens 203 so that it can be emitted from the projection outlet EX.

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

[0074] As shown in Figures 1 and 4, the light source cavity 10 and the display cavity 20 are arranged adjacent to each other in a first direction X. The light source cavity 10 includes a cavity surrounded by a light guide portion 102 for arranging a light source 101, and the display cavity 20 includes a cavity surrounded by a first lens 201, a first air duct wall CV1, and a cover located 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 with the second direction Y. In some embodiments, the embodiments of the present disclosure are described using the example of the first direction X and the second direction Z being perpendicular, but are not limited thereto.

[0075] For example, in some embodiments, as shown in Figures 2 and 5, the first cover body CV1 may include a top cover portion 300, and the top cover portion 300 is located on a side of the second cover body CV2 away from the fan 205. For example, the top cover portion 300 of the first cover body CV1 and the second cover body CV2 are disposed adjacent to each other in the second direction Z. For example, the first cover body CV1 may also include other structures in addition to the top cover portion 300, such as a side cover portion 320 (described in detail later), which is not limited in the embodiments of the present disclosure.

[0076] For example, as shown in Figures 4 and 6, the first air duct wall CV1 includes a first connecting portion 310, and the second air duct wall CV2 includes a second connecting portion 410. One end of the first connecting portion 310 extends to the outline edge 2011 of the first lens 201 to connect with the first lens 201, and one end of the second connecting portion 410 extends to the outline edge 2012 of the display panel 202 to connect with the display panel 202. As shown in Figure 6, the orthographic projection of the first connecting portion 310 on the first plane A1 and the orthographic projection of the second connecting portion 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 FIG6 , the first connection portion 310 is a portion of the first air duct wall CV1. For example, the first connection portion 310 extends in a non-linear direction, thereby enabling a good connection with the first lens 201 and allowing fluid flowing from the surface of the first lens 201 to flow smoothly along the surface of the first connection portion 310, thereby removing heat from the first connection portion 310 and improving heat dissipation. For example, the second connection portion 410 is a portion of the second air duct wall CV2. For example, the second connection portion 410 extends in a non-linear direction, thereby enabling a good connection with the display panel 202 and allowing fluid flowing from the surface of the display panel 202 to flow smoothly along the surface of the second connection portion 410, thereby removing heat from the second connection portion 410 and improving heat dissipation.

[0078] For example, in some embodiments, as shown in FIG6 , the optical structure 01 further includes a heat shielding element 206. In the first direction X, the heat shielding element 206 is located between the first lens 201 and the display panel 202, and is spaced apart from both the first lens 201 and the display panel 202. For example, the heat shielding element 206 may be insulating glass, but the embodiments of the present disclosure are not limited thereto. A first channel C1 is defined between the first lens 201 and the heat shielding element 206, a second channel C2 is defined between the heat shielding element 206 and the display panel 202, a third channel C3 is defined between the display panel 202 and the second lens 203, and a fourth channel C4 is defined between the first air duct wall CV1 and the second air duct wall CV2. In some embodiments, both the first channel C1 and the second channel C2 are connected to the fourth channel C4. A cavity U0 is defined between the second air duct wall CV2 and the fan 205, and the cavity U0 is connected to the third channel C3. Cavity U0 is the cavity enclosed by the second air duct wall CV2, the fan 205, and the second lens 203.

[0079] For example, in some embodiments, as shown in FIG6 , the fan 205 has an air inlet surface S1 and an air outlet surface S2. A portion of the airflow (e.g., air) blown out from 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 portion of the airflow blown out from the air outlet surface S2 of the fan 205 can enter the first channel C1 and the second channel C2 respectively, then flow to the fourth channel C4, and then flow back to the air inlet surface S1 of the fan. Thus, the above-mentioned first channel C1, second channel C2, third channel C3, fourth channel C4 and cavity U0 constitute the internal circulation air duct of the fan 01.

[0080] For example, in some embodiments, as shown in FIG6 , the air inlet surface S1 has an air inlet, which is, for example, circular, rectangular, or other suitable shapes. For example, in some examples, the surface opposite the air inlet surface S1 can also be formed as an air inlet surface and have an air inlet, thereby achieving double-sided air intake for the fan 205 and increasing the air intake volume. For example, the air outlet surface S2 has an air outlet, for example, the edge of the air outlet is along the edge of the air outlet surface S2, and is, for example, rectangular or other suitable shapes.

[0081] As shown in FIG6 , 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, and the minimum distance between the display panel 202 and the second lens 203 in the first direction X is N mm, and 0.3×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 in millimeters.

[0082] For example, in some embodiments, the value of 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 may satisfy: 0.62×M≤A≤12, and the second distance C may satisfy: 4.2≤C≤N. For example, the first distance A may 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] This arrangement allows for efficient diversion of the airflow exiting the outlet surface S2 of the fan 205. For example, it allows for an appropriate amount of airflow from the first and second channels C1 and C2 to enter the fourth channel C4, and an appropriate amount of airflow from the third channel C3 to enter the cavity U0. For example, the amount of airflow entering the fourth channel C4 is greater than the amount entering the third channel C3, and this facilitates a more stable flow rate and smoother flow of airflow as it enters each channel. Consequently, the structure of the internal circulation duct of the optical structure 01 can be optimized to a favorable state, effectively improving the flow rate and temperature distribution of the fluid, increasing the efficiency of heat exchange between the airflow and the outside world, and ensuring that the fan structure has a good heat dissipation effect.

[0084] For example, in some embodiments, as shown in FIG6 , a circulation channel C123 is defined between the first lens 201 and the second lens 203. The dimension of the circulation channel C123 in the first direction X is smaller than the dimension of the fan 205 in the second direction Z. For example, multiple components, such as the display panel 202 and the thermal insulation element 206, may be disposed between the first lens 201 and the second lens 203. The dimension of the circulation channel C123 in the first direction X refers to the sum of the dimensions in the first direction X of the channels between each adjacent two components of the first lens 201, the second lens 203, and the multiple components therebetween.

[0085] For example, in some embodiments, as shown in FIG6 , the circulation channel C123 may include multiple sub-channels, such as a first channel C1, a second channel C2, and a third channel C3. In the first direction X, the distance between the first lens 201 and the thermal insulation element 206 is M1 (i.e., the size of the first channel C1), the distance between the thermal insulation element 206 and the display panel 202 is M2 (i.e., the size of the second channel C2), the distance between the display panel 202 and the second lens 203 is N (i.e., the size of the third channel C3), the size of the fan 205 in the second direction Z is F, and M1+M2+N<F. For example, when other components are disposed between the first lens 201 and the second lens 203, the circulation channel C123 may further include additional sub-channels, which is not limited in the embodiments of the present disclosure.

[0086] Such a configuration is conducive to increasing the size of the air outlet surface S2 of the fan 205, so that the fan 205 has a sufficiently large air outlet, so that when the airflow is discharged from the fan 205, it can enter the circulation channel C123, thereby enhancing the flow rate of the airflow in the circulation channel C123, so that the airflow can take away the heat from the surface of each device (for example, the first lens 201, the heat insulation element 206, the display panel 202 and the second lens 203), thereby enhancing the heat exchange capacity.

[0087] For example, in some embodiments, as shown in Figure 6, the air flow rate entering the third channel C3 can be 1 / 4 to 2 / 3 of the air flow rate entering the fourth channel C4, such as 1 / 3 or 1 / 2. For example, when the flow rate of the air flow in the third channel C3 is basically equal to the flow rate of the air flow in the fourth channel C4, when the air flow circulation area of ​​the third channel C3 is 1 / 2 of the air flow circulation area, the air flow rate of the third channel C3 can be 1 / 2 of the air flow rate of the fourth channel C4; when the air flow circulation area of ​​the third channel C3 is 1 / 3 of the air flow circulation area, the air flow rate of the third channel C3 can be 1 / 3 of the air flow rate of the fourth channel C4, but the embodiments of the present disclosure are not limited to this.

[0088] This allows the airflow to be reasonably distributed, so that the airflow flows smoothly in each channel and takes away the heat in each channel, thereby achieving a good heat dissipation effect.

[0089] For example, in some embodiments, as shown in FIG6 , the first distance A and the second distance C satisfy: 15.5≤A+C≤16.5, for example, 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 achieved (see the corresponding simulation results of FIG17 and FIG18 below).

[0090] Thus, the structure of the internal circulation air duct of the optical structure can be further optimized so that the total air flow outflowing from 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 the air flow within a reasonable air outlet width range, thereby improving the efficiency of heat exchange between the air flow and the outside world, and making the fan structure have a good heat dissipation effect.

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

[0092] For example, in some embodiments, as shown in Figures 5 and 6, the second cover plate CV2 further includes a second extension portion 430, which is located on a side of the reflector 204 away from the fan 205. At least a portion of the second extension portion 430 is parallel to the first plane A1, and the orthographic projection of the second extension portion 430 on the first plane A1 at least partially overlaps with the orthographic projection of the reflector 204 on the first plane A1. For example, in some embodiments, the surface of the second extension portion 430 proximal to the fan is parallel to the first plane A1. This allows the distance between the first extension portion 330 and the second extension portion 430 in the second direction Z to be relatively uniform, thereby facilitating smooth airflow between the first extension portion 330 and the second extension portion 430, achieving a uniform and stable flow rate.

[0093] For example, in some embodiments, as shown in FIG. 6 , in the second direction Z, the minimum distance between the first extension portion 330 and the second extension portion 430 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] With such a configuration, the fourth channel C4 can further accommodate the airflow and provide a buffer space for the flow of the airflow, so that the airflow can flow more smoothly and be quickly guided into the cavity U0 to reduce airflow blockage, which is beneficial to lowering the temperature of the device.

[0096] For example, in some embodiments, as shown in FIG6 , the first air duct wall CV1 further includes a first inclined portion 320. The first extension portion 330 is connected to the first connection portion 310 via the first inclined portion 320. The first inclined portion 320 includes a first end 3201 and a second end 3202 opposite to each other. The first end 3201 is connected to the first connection portion 310, and the second end 3202 is connected to the first extension portion 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 FIG6 , the first plane A1 may be a plane perpendicular to the second direction Z. The first extension portion 330 of the first air duct wall CV1 is substantially parallel to the first plane A1. The end of the first connecting portion 310 proximal to the first inclined portion 320 is further away from the fan 205 than the first extension portion 330, thereby causing the first end 3201 of the first inclined portion 320 to be further away from the fan 205 than the second end 3202.

[0098] For example, in some embodiments, as shown in FIG6 , the second air duct wall CV2 further includes a second inclined portion 420. The second extension portion 430 is connected to the second connection portion 410 via the second inclined portion 420. The second inclined portion 420 includes a third end 4201 and a fourth end 4202 opposite to each other. The third end 4201 is connected to the second connection portion 410, and the fourth end 4202 is connected to the second extension portion 430. The third end 4201 is farther away from the fan 205 than the fourth end 4202.

[0099] 6 , the end of the second connecting portion 410 proximal to the second extending portion 430 is further away from the fan 205 than the second extending portion 430, thereby causing the third end 4201 of the second inclined portion 420 to be further away from the fan 205 than the fourth end 4202. The second extending portion 430 can be substantially parallel to the first plane A1, thereby causing the second extending portion 430 to be substantially parallel to the first extending portion 330, thereby making the distance between the first extending portion 330 and the second extending portion 430 relatively uniform in the second direction Z.

[0100] For example, in some embodiments, as shown in FIG6 , the first inclined portion 320 has a first angle α1 with the first plane A1, and the second inclined portion 420 has a second angle α2 with the first plane A1. For example, in some embodiments, the ratio of the second angle α2 to the first angle α1 is 1.5 to 3, such as 1.2 to 1.6, 1.4 to 18, 1.5 to 2, 2 to 2.5, 2.4 to 2.8, or 2.6 to 3. For example, in some embodiments, the first angle α1 can be smaller than the second angle α2. For example, the first angle α1 can be 20 to 30 degrees, such as 25 to 30 degrees, 22 to 26 degrees, 23 to 27 degrees, or 24 to 28 degrees. For example, the second angle α2 can be 40 to 50 degrees, such as 42 to 48 degrees, 43 to 46 degrees, 45 to 49 degrees, 41 to 47 degrees, or 46 to 49 degrees.

[0101] This arrangement allows the distance between the first inclined portion 320 and the second inclined portion 420 to be substantially uniform. For example, the distance may be substantially equal to the first distance A or substantially equal to the distance B. This allows the flow rate of the airflow in the fourth channel C4 to be uniform, reduces the flow resistance of the airflow, and helps lower the temperature of the device.

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

[0103] For example, as shown in Figures 6 and 7A to 16B, when the optical structure provided by the embodiment 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, distance B=9.2, and the fluid in the optical structure is air.

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

[0105] For example, in some embodiments, as shown in FIG7A and FIG7B , “plane 1” in the figure represents plane 1, which is a reference plane selected during simulation modeling. “Y=-3mm” in the figure indicates that the distance between plane 1 and the simulation modeling center (i.e., the center of gravity of the optomechanical structure) in the Y direction shown in FIG5 is 3mm. The results of each cloud map in this application are all obtained based on plane 1. “3.81m / s” in the figure indicates that the air speed is 3.81 meters per second. “53.2degC” in the figure indicates that the temperature is 53.2 degrees Celsius, i.e., 53.2°C. In other result cloud maps, the meanings of the symbols shown are the same as above and will not be repeated hereafter.

[0106] For example, in some embodiments, as shown in Table 1, Figures 6, and 17, when the first distance A satisfies the following conditions: 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 the following conditions: 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 the following conditions: 5 ≤ A ≤ 14, as the first distance A gradually increases, the temperature of the thermal insulation element 206 gradually increases. When the first distance A satisfies the following conditions: 5 ≤ A ≤ 14, and as the first distance A gradually increases, the temperature difference between the display panel 202 and the thermal insulation element 206 gradually decreases. When the first distance A satisfies the following conditions: 7 ≤ A ≤ 9, the temperature difference between the display panel 202 and the thermal insulation element 206 tends to be stable and essentially unchanged, i.e., approximately 7°C. When the first distance A satisfies the following conditions: 5 ≤ A ≤ 7, the temperature difference between the display panel 202 and the thermal insulation element 206 is larger. When the first distance A satisfies: 9≤A≤14, the temperature of the display panel 202 decreases significantly as the first distance A gradually increases. When 9≤A≤10, the temperatures of the display panel 202 and the heat insulation element 206 change rapidly, and the temperature difference between the two decreases significantly.

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

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

[0109] According to the simulation results, on the one hand, as shown in Table 1 and Figure 17, in order to ensure that the temperature difference between the display panel 202 and the heat insulation element 206 is small during air circulation, and the temperature change of the display panel 202 and the heat insulation element 206 is slow, the first distance A can be made to satisfy: 9≤A≤11. On the other hand, as shown in Table 1, Figure 6 and Figure 18, in order to enable the air to have a large flow rate without too much change, 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 connection part 310 and the second connection part 410.

[0110] Table 1

[0111] For example, in some embodiments, as shown in FIG6 , 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 to 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 integrally formed. The end of the first sub-connecting portion 3101 away from the second sub-connecting portion 3102 is connected to the first lens 201, and the end of the second sub-connecting portion 3102 away from the first sub-connecting portion 3101 is connected to the first extending portion 330.

[0112] For example, in some embodiments, as shown in FIG6 , the surface of the first sub-connecting portion 3101 facing the second lens 203 has a first arc shape. For example, the cross-section of the second sub-connecting portion 3102 can have a first rectangular shape. This allows the airflow from the first channel C1 to flow smoothly along the inner surface of the first sub-connecting portion 3101 (i.e., the surface facing the second connecting portion 410), effectively controlling wind resistance and helping to reduce the temperature of components (e.g., the thermal insulation element 206 or the first connecting portion 310).

[0113] For example, in some embodiments, as shown in FIG6 , the second connection portion 410 includes a third sub-connection portion 4101 and a fourth sub-connection portion 4102. The third sub-connection portion 4101 is connected to the fourth sub-connection portion 4102, and the fourth sub-connection portion 4102 is closer to the display panel 202 than the second sub-connection portion 3102. For example, in some embodiments, the third sub-connection portion 4101 and the fourth sub-connection portion 4102 are integrally formed. The end of the third sub-connection portion 4101 away from the fourth sub-connection portion 4102 is connected to the display panel 202, and the end of the fourth sub-connection portion 4102 away from the third sub-connection portion 4101 is connected to the second extending portion 430.

[0114] For example, in some embodiments, as shown in FIG6 , the surface of the third sub-connecting portion 4101 facing the second lens 203 has a second arc shape. For example, the cross-section of the fourth sub-connecting portion 4102 can have a second rectangular shape. This allows airflow, for example, flowing out of the second channel C2, to flow smoothly along the outer surface of the third sub-connecting portion 4101 (i.e., the surface facing the first connecting portion 310), effectively controlling wind resistance and facilitating lowering the temperature of components (e.g., the thermal insulation element 206 or the display panel 202).

[0115] For example, in some embodiments, as shown in FIG6 , the radius of curvature R1 of the first arc is greater than the radius of curvature R2 of the second arc. The second sub-connecting portion 3102 is substantially parallel to the first plane A1, and the fourth sub-connecting portion 4102 is substantially parallel to the first plane A1. This arrangement allows for a smooth connection between the second sub-connecting portion 3201 and the first lens 201 via the first sub-connecting portion 3101, and a smooth connection between the fourth sub-connecting portion 4102 and the display panel 202 via the third sub-connecting portion 4101. This helps to uniformly maintain the distance between the first sub-connecting portion 3101 and the third sub-connecting portion 4101, thereby reducing the risk of device temperature increases due to airflow blockage or sudden changes in flow rate.

[0116] For example, in some embodiments, as shown in FIG6 , the radius of curvature of the first arc can be 15 mm to 18 mm, such as 16 mm to 18 mm, 17 mm to 18 mm, 15 mm to 17 mm, or 16 mm to 17 mm. For example, the radius of curvature of the second arc can be 5 mm to 10 mm, such as 5 mm to 8 mm, 6 mm to 8 mm, 7 mm to 10 mm, or 7.5 mm to 9.0 mm. This helps further reduce the risk of sudden changes in airflow velocity, which can cause device temperature increases.

[0117] Figure 19 is a schematic diagram of the internal structure of an optical structure provided by at least one embodiment of the present disclosure; Figure 20 is a main view of the optical structure provided by at least one embodiment of the present disclosure; Figure 21A is a schematic diagram of the cross-sectional structure of the optical structure in Figure 20 along line BB; Figure 21B is a schematic diagram of the heat dissipation structure in the optical structure provided by at least one embodiment of the present disclosure.

[0118] For example, Figure 19 is a schematic diagram of the internal structure of the optical structure after removing the top cover. As shown in Figure 19, the second extension portion 430 of the second air duct wall CV2 includes a first extension member 4301, a second extension member 4302, and a connector 4303 located between the first extension member 4301 and the second extension member 4302. For example, in some embodiments, the orthographic projections of the first extension member 4301 and the second extension member 4302 on the first plane A1 do not overlap, and the first extension member 4301 and the second extension member 4302 on the first plane A1 are located on either side of the reflector 204. The end of the reflector 204 facing away from the fan 205 is at least partially in contact with the connector 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 surface of the reflector 204 proximal to the second extension portion 430 is parallel to the first plane A1. This end surface of the reflector 204 contacts and abuts against the second extension portion 430. For example, in some embodiments, the reflector 204 may provide support for the second extension 430 .

[0119] For example, in some embodiments, as shown in Figures 5, 20, and 21A, the reflector 204 can separate the cavity U0. For example, in some embodiments, a first cavity U1 is defined between the reflector 204 and the second lens 203, and a second cavity U2 is defined on the side of the reflector 204 away from the first cavity U1. For example, both the first cavity U1 and the second cavity U2 are part of the cavity U0 and are located on either side of the reflector 204. The first cavity U1 can be defined by the reflector 204, the second lens 203, and the second air duct wall CV2. The second cavity U2 can be defined by the reflector 204, the second air duct wall CV2, and the side cover 320 (see Figure 38) of the first air duct wall CV1. A third cavity U3 is defined between the first and second air duct walls CV1 and CV2.

[0120] For example, in some embodiments, as shown in Figures 5 and 19, the first extension member 4301 has at least one first opening 4310, and the second extension member 4302 has at least one second opening 4320. The first cavity U1 and the third cavity U3 are connected through the first opening 4310, and the second cavity U2 and the third cavity U3 are connected through the second opening 4320. At least a portion of the third cavity U3 can serve as the fourth channel C4 (as shown in Figure 6). For example, in some embodiments, the first extension member 4301 can have one or more first openings 4310, and the second extension member 4302 can have one or more second openings 4320.

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

[0122] For example, in some embodiments, as shown in Figures 5 and 19, the optical structure further includes 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, thereby reducing the temperature of the airflow returning to the fan 205. For example, in some embodiments, the opening area of ​​at least one first opening 4310 is smaller than the opening area of ​​at least one second opening 4320. In other words, the total opening area of ​​the first openings 4310 in the first extension member 4301 is smaller than the total opening area of ​​the second openings 4320 in the second extension member 4302. For example, in some embodiments, Figure 19 uses the example of a first extension member 4301 having multiple first openings 4310 and a second extension member 4302 having multiple second openings 4320 as an example, and the total opening area of ​​the multiple first openings 4310 is smaller than the total opening area of ​​the multiple second openings 4320.

[0123] As shown in Figures 5 and 19, such a configuration allows a larger portion of the airflow in the third cavity U3 to enter the second cavity U2 through the second opening 4320 to be cooled by the heat dissipation element 450, thereby making the temperature of the airflow returning to the fan 205 lower, which is beneficial to the safety of the device.

[0124] For example, in some embodiments, as shown in FIG19 , the orthographic projection area of ​​the second opening 4320 in the second extension member 4302 on the first plane A1 is greater than the orthographic projection area of ​​the heat dissipation element 450 on the first plane A1. For example, in some embodiments, when the second extension member 4302 has multiple second openings 4320, the sum of the orthographic projection areas of the multiple second openings 4320 on the first plane A1 is greater than the orthographic projection area of ​​the heat dissipation element 450 on the first plane A1. This configuration allows for a greater amount of airflow entering the second cavity U2 from the second openings 4320, allowing for sufficient contact with the heat dissipation element 450 for good heat exchange.

[0125] FIG22 is a schematic diagram of a second air duct wall provided by at least one embodiment of the present disclosure.

[0126] For example, in some embodiments, as shown in FIG22 , the number of first openings 4310 in the second air duct wall CV2 may be greater than the number of second openings 4320. For example, in some embodiments, the second air duct wall CV2 may be provided with only one second opening 4320, or the second air duct wall CV2 may be provided with multiple first openings 4310. This allows the airflow entering the second cavity U2 to fully contact the heat dissipation element 450, simplifies the manufacturing process of the second air duct wall CV2, and makes the structure of the second air duct wall CV2 simpler.

[0127] Figure 23 is a schematic diagram of another second air duct wall provided by at least one embodiment of the present disclosure; Figure 24A is a schematic diagram of yet another second air duct wall provided by at least one embodiment of the present disclosure; Figure 24B is a schematic diagram of yet another second air duct wall provided by at least one embodiment of the present disclosure; Figure 25 is a schematic diagram of yet another second air duct wall provided by at least one embodiment of the present disclosure.

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

[0129] For example, in some embodiments, as shown in Figures 5 and 23-25, the opening area of ​​the first openings 4310 in the second air duct wall CV2 is 9.0% to 19% of the opening area of ​​the second openings 4320. That is, the total area of ​​the orthographic projections of the plurality of first openings 4310 on the first plane A1 is 9.0% to 19% of the total area of ​​the orthographic projections of the second openings 4320 on the first plane A1, such as 9.0% to 19.0%, 10.0% to 18.0%, 12.0% to 16.0%, or 13.0% to 15.0%. Compared to the second air duct wall CV2 shown in Figure 22, 75% to 85% of the first openings 4310 in the second air duct wall CV2 are blocked. This arrangement allows the airflow in the third cavity U3 to fully contact the first air duct wall CV1, thereby enhancing heat exchange with the outside world. This allows the airflow in the third cavity U3 to cool before entering the first cavity U1 through the first openings 4310, which helps reduce device temperature.

[0130] For example, in some embodiments, as shown in Figures 5 and 23-25, the opening area of ​​the first openings 4310 in the second air duct wall CV2 is 12.0% to 16% of the opening area of ​​the second openings 4320, such as 12.0% to 15%, 13.0% to 14.0%, or 14.0% to 16.0%. That is, compared to the second air duct wall CV2 shown in Figure 22, 75% to 80% of the first openings 4310 in the second air duct wall CV2 are blocked. This further improves the heat exchange efficiency between the airflow in the third cavity U3 and the outside world, further helping to reduce the temperature of the airflow entering the first cavity U1.

[0131] For example, in some embodiments, as shown in Figures 5 and 24A, the connector 4303 of the second air duct wall CV2 includes a first edge 4350 proximate to the second opening 4320, the second inclined portion 420 of the second air duct wall CV2 includes a second edge 4250 proximate to the second opening 4320, the extension direction of the first edge 4350 intersects the extension direction of the second edge 4250, and the 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° to 55°, such as 30° to 50°, 35° to 45°, 40° to 55°, or 40° to 45°.

[0132] For example, in some embodiments, as shown in Figures 5 and 24A, at least one first opening 4310 in the first extension member 4301 is provided along the first edge 4350. The first extension member 4301 includes a plurality of first openings 4310, which are sequentially spaced apart 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 Figures 5 and 24A, the first extension member 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 distances 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 increase in sequence. Therefore, the flow path of the airflow entering the first sub-opening 4311 is smaller than the flow path of the airflow entering the second sub-opening 4312, the flow path of the airflow entering the second sub-opening 4312 is smaller than the flow path of the airflow entering the third sub-opening 4313, and the flow path of the airflow entering the third sub-opening 4313 is smaller than the flow path of the airflow entering the fourth sub-opening 4314. By arranging the first opening 4310 in the first extension member 4301 along the first edge 4350, the airflow path within the third cavity U3 is increased, ensuring sufficient contact between the airflow and the first air duct wall CV1, thereby enhancing heat exchange capacity. The simulation results for the second cover plate CV2 shown in Figure 24A are described below in Table 2 and Figures 28A and 28B.

[0134] For example, in some embodiments, the first extension member 4301 may include only one first opening 4310, and the first opening 4310 may be located at the edge of the first edge 4350. For example, in some embodiments, the orthographic projection of the 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 Figure 24A, as shown in Figure 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 connected into a first opening, that is, the first opening 4310 in Figure 24B. At this time, the length direction of the first opening 4310 is basically parallel to the extension direction of the first edge 4350.

[0136] For example, as shown in FIG24A , the second extension member 4302 has a second opening 4320. A first edge 4350 serves as at least a portion of the edge of the second opening 4320 proximate to the first extension member 4301. That is, the edge of the second opening 4320 proximate to the first extension member 4301 includes the first edge 4350. For example, in some embodiments, the maximum dimension of the second opening 4320 in the direction in which the first edge 4350 extends is a first dimension M1, and the maximum dimension of the second opening 4320 in a direction perpendicular to the direction in which the first edge 4350 extends is a second dimension M2, with the first dimension M1 being greater than the second dimension M2. This can help increase the opening area of ​​the second opening 4320, thereby facilitating airflow through the second opening 4320 into the second cavity U2 (as shown in FIG5 ) for cooling.

[0137] For example, in some embodiments, as shown in Figures 5 and 24A, the orthographic projection of the first opening 4310 on the first plane A1 may be fan-shaped, circular, elliptical or polygonal. For example, the orthographic projection of the second opening 4320 on the first plane A1 (as shown in Figure 5) is fan-shaped, circular, elliptical or polygonal. For example, the orthographic projection shape of the first opening 4310 on the first plane A1 may 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 to this. For example, when the second extension member 4302 has a plurality of second openings 4320, the orthographic projection shapes of the plurality of second openings 4320 on the first plane A1 may be the same as or different, and the embodiments of the present disclosure are not limited to this, and may be specifically set according to the structural strength or spatial layout requirements.

[0138] 26A to 29B are cloud diagrams of simulation analysis results for the optical structure provided in the embodiment of the present disclosure; Table 2 is a result summary table corresponding to the cloud diagrams in FIG. 26A to FIG. 29B .

[0139] For example, as shown in Figures 6 and 26A to 29B, when the optical structure provided by the embodiment 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, Figures 26A and 26B are result cloud maps corresponding to the second air duct wall shown in Figure 22; Figures 27A and 27B are result cloud maps corresponding to the second air duct wall shown in Figure 23; Figures 28A and 28B are result cloud maps corresponding to the second air duct wall shown in Figure 24A; Figures 29A and 29B are result cloud maps corresponding to the second air duct wall shown in Figure 25.

[0141] For example, as shown in Table 2, Figure 6, and Figures 26A-26B, for the second air duct wall CV2 shown in Figure 22, the airflow velocity at the turning point of the passage between the first air duct wall CV1 and the second air duct wall CV2 is 2.41 m / s. The airflow velocity in the first channel C1 is 1.91 m / s, and the airflow velocity in the second channel C2 is 1.82 m / s, resulting in a significant change in the airflow velocity at the turning point.

[0142] For example, as shown in Table 2, Figure 6, and Figures 27A-27B, for the second air duct wall CV2 shown in Figure 23, which is equivalent to blocking approximately 73% of the first openings 4310 in the second air duct wall CV2 shown in Figure 22, the airflow velocity at the turning point of the passage between the first air duct wall CV1 and the second air duct wall CV2 is 2.27 m / s. The airflow velocity in the first channel C1 is 2.01 m / s, and the airflow velocity in the second channel C2 is 1.68 m / s, resulting in a significant change in the airflow velocity at the turning point.

[0143] For example, as shown in Table 2, Figure 6, and Figures 28A to 28B, for the second air duct wall CV2 shown in Figure 24A, that is, equivalent to blocking approximately 79% of the first openings 4310 in the second air duct wall CV2 shown in Figure 22, the air flow velocity at the turning position of the channel between the first air duct wall CV1 and the second air duct wall CV2 is 1.97 m / s, the air flow velocity in the first channel C1 is 1.92 m / s, and the air flow velocity in the second channel C2 is 1.73 m / s. Therefore, the air flow velocity at the above-mentioned turning position does not change suddenly and is relatively stable.

[0144] For example, as shown in Table 2, Figure 6, and Figures 29A-29B, for the second air duct wall CV2 shown in Figure 25, which is equivalent to blocking approximately 73% of the first openings 4310 in the second air duct wall CV2 shown in Figure 22, the airflow velocity at the turning point of the passage between the first air duct wall CV1 and the second air duct wall CV2 is 2.48 m / s. The airflow velocity in the first channel C1 is 2.07 m / s, and the airflow velocity in the second channel C2 is 1.87 m / s, resulting in a significant change in the airflow velocity at the turning point.

[0145] It can be seen that for the second air duct wall CV2 shown in Figure 24A, the ratio of the opening area of ​​the first opening 4310 to the opening area of ​​the second opening 4320 is approximately 16%. The first extension member 4301 (as shown in Figure 19) includes a plurality of first openings 4310, and the plurality of first openings 4310 are arranged in sequence along the first edge 4350. The second cover plate CV2 with this structure can make the airflow speed more stable, and make the temperature of the display panel 202 and the heat insulation element 206 lower, which is beneficial to improving the life of each component.

[0146] Table 2

[0147] Figures 30 to 32 are schematic diagrams of some second duct walls provided by at least one embodiment of the present disclosure. Figures 33A to 35B are cloud diagrams of simulation analysis results for the optical structure provided by the embodiment of the present disclosure; Table 3 is a summary table of results corresponding to the cloud diagrams in Figures 33A to 35B. For the simulation results of the optical structure where the second duct wall CV2 shown in Figure 24A is located, please refer to the results corresponding to number 1 in Table 3. For example, Figures 33A and 33B are result cloud diagrams corresponding to the second duct wall shown in Figure 30, and their simulation results please refer to the results corresponding to number 2 in Table 3; Figures 34A and 34B are result cloud diagrams corresponding to the second duct wall shown in Figure 31, and their simulation results please refer to the results corresponding to number 3 in Table 3; Figures 35A and 35B are result cloud diagrams corresponding to the second duct wall shown in Figure 32, and their simulation results please refer to the results corresponding to number 4 in Table 3.

[0148] For example, as shown in Figures 6 and 33A to 35B, when the optical structure provided by the embodiment 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 member 4301 in the second air duct wall shown in Figures 30 to 32 is the same as that in Figure 24A , except for the structure of the second extension member 4302. For example, compared to the second opening 4320 in Figure 24A , the second openings 4320 in the second air duct wall shown in Figures 30 to 32 have smaller opening areas. For example, the opening area of ​​the second opening 4320 shown in Figure 30 is smaller than the opening area of ​​the second opening 4320 shown in Figure 24A , the opening area of ​​the second opening 4320 shown in Figure 31 is smaller than the opening area of ​​the second opening 4320 shown in Figure 30 , and the opening area of ​​the second opening 4320 shown in Figure 32 is smaller than the opening area of ​​the second opening 4320 shown in Figure 31 .

[0150] For example, in some embodiments, as shown in Table 3 and FIG6 , compared to the optical structure in which the second air duct wall is located shown in FIG24A , in the optical structure in which the second air duct wall is located shown in FIG30 to FIG32 , as the opening area of ​​the second opening 4320 gradually decreases, the temperature of the display panel 202 and the thermal insulation element 206 both gradually increases. Simultaneously, 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 significant. For example, compared to the optical structure in which the second air duct wall CV2 is located shown in FIG24A , in the optical structure in which the second air duct wall CV2 is located shown in FIG32 , the air velocity in the first channel C1 decreases by 0.51 m / s, the air velocity in 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 thermal insulation element 206 increases by 3°C.

[0151] The simulation results shown in Figures 26A to 29B show that reducing the opening area of ​​first opening 4310 is detrimental to stabilizing the air flow rate and can increase the temperature of various components in the optical structure (e.g., display panel 202 and thermal insulation element 206), hindering component lifespan. Therefore, to ensure good performance of the optical structure, the opening area of ​​first opening 4310 can be maintained. For example, the structure of first opening 4310 shown in Figures 22 to 25 can be used.

[0152] Table 3

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

[0154] For example, in some embodiments, as shown in Figures 5 and 6, the first end 510 of the guide structure 500 can be connected to the edge of the display panel 202 near the fan 205 via a connecting element. For example, the first end 510 and the edge of the display panel 202 near the fan 205 are both snapped onto the same connecting element to achieve connection, but the embodiments of the present disclosure are not limited thereto. For example, the airflow flowing out of the air outlet surface S2 of the fan 205 can be divided by the 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. Thus, the guide structure 500 can reasonably distribute the airflow so that the airflow has a stable flow state in different channels.

[0155] For example, in some embodiments, as shown in Figures 5 and 6 , the cross-section of the air 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 parallel to the first direction X. For example, the second plane A2 can be a plane along the first direction X and the second direction Z. This arrangement allows the wind diverted by the air guide structure 500 to be smoothly and steadily directed to the third channel C3, thereby generating heat exchange with the display panel 202 and improving heat dissipation efficiency.

[0156] For example, in some embodiments, as shown in Figures 5 and 6, the orthographic projection of the air guide structure 500 on the first plane A1 and the orthographic projection of the second lens 203 on the first plane A1 may not overlap. For example, the distance between the air guide structure 500 and the surface of the fan 205 near the second air duct wall CV2 is relatively small, and this distance is smaller than the distance between the air guide structure 500 and the surface of the fan 205 away from the second air duct wall CV2. For example, the second end 520 of the air guide structure 500 points to the side of the middle of the air outlet surface S2 near the second air duct wall CV2. For example, the second end 520 of the air guide structure 500 is close to the air outlet surface S2 of the fan 205 and does not contact the air outlet surface S2. As a result, the airflow flowing out of the air outlet surface S2 can be quickly diverted by the air guide structure 500, which helps control the amount of airflow entering the third channel C3 and allows the air guide structure 500 to have a reasonable installation space. For example, in some embodiments, as shown in Figures 5 and 6, the angle λ between the cross-sections of the two ends of the guide structure 500 can be 80° to 90°. For example, the cross-section of the first end 510 and the cross-section of the second end 520 have an angle λ, and the angle λ is 80° to 90°, for example, it can be 80° to 85°, 83° to 86°, 84° to 87° or 86° to 90°, and the embodiments of the present disclosure are not limited to this.

[0157] For example, in some embodiments, in the first direction X, the minimum distance W between the guide structure 500 and the fan 205 is 1 mm to 1.5 mm, for example, 1.2 mm to 1.4 mm, 1.1 mm to 1.3 mm, or 1.4 mm to 1.5 mm, so as to further control the amount of airflow entering the third channel C3 and help improve the heat dissipation effect of the airflow on each component.

[0158] In an embodiment 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. Thus, through the three air guide channels, the overall heat dissipation effect of the display cavity 200 can be better improved.

[0159] Figures 36A to 37B are cloud plots of simulation analysis results for the optical structures provided by embodiments of the present disclosure; Table 4 is a summary table of the results corresponding to the cloud plots in Figures 36A to 37B. For example, Figures 37A and 37B are cloud plots of the results corresponding to the optical structure shown in Figure 6 (i.e., with a flow guide structure). For the simulation results, please refer to the result corresponding to number 2 in Table 4. Figures 36A and 36B are cloud plots of the results corresponding to the optical structure shown in Figure 6 without a flow guide structure. For the simulation results, please refer to the result corresponding to number 1 in Table 4.

[0160] For example, as shown in Figures 6 and 36A to 37B, when the optical structure provided by the embodiment 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.

[0161] For example, as shown in Table 4, Figure 6, and Figures 36A-37B, after installing the air guide structure 500, the air flow rate in the first channel C1 and the air flow rate in the third channel C3 both increased, while the air flow rate in the second channel C2 decreased slightly, but the decrease was relatively small. The temperature of both the thermal insulation element 206 and the display panel 202 decreased. Therefore, installing the air guide structure 500 improves the heat dissipation of components such as the thermal insulation element 206 and the display panel 202, thereby increasing the lifespan of each component.

[0162] Table 4

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

[0164] For example, as shown in Figures 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 serve 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 a single material and through a single process. Such an arrangement is conducive to simplifying the structure of the optical structure, reducing the difficulty of installation, and allowing the gas to fully exchange heat with the first air duct wall CV1 to improve heat dissipation efficiency.

[0165] For example, as shown in Figures 39A and 39B , the side cover portion 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 respectively connected to the side wall 3201. The plurality of first heat dissipation structures 3210 are located in the second cavity U2 (as shown in Figure 5 ), and the plurality of second heat dissipation structures 3220 are located on a side of the side wall 3201 away from the second cavity U2. The plurality of first heat dissipation structures 3210 are adjacent to and spaced apart from the reflector 204.

[0166] For example, as shown in Figures 1 and 39A, multiple first heat dissipation structures 3210 and multiple second heat dissipation structures 3220 are respectively located on both sides of the side wall 3201. The multiple first heat dissipation structures 3210 are adjacent to the reflector 204, which means that no other devices, such as radiators, are provided between the multiple first heat dissipation structures 3210 and the reflector 204, so that the airflow in the second cavity U2 can dissipate heat through the multiple first heat dissipation structures 3210 to reduce its temperature. Therefore, by configuring the first air duct wall CV1 in this way, other heat dissipation devices, such as radiators, located in the second cavity U2 can be reduced, and the multiple first heat dissipation structures 3210 can be used as "intra-cavity radiators", so that the first air duct wall CV1 has a more powerful heat dissipation function, which is conducive to enhancing heat exchange between the airflow and the outside world to enhance the heat dissipation effect, while also simplifying the internal structure of the optical structure.

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

[0168] For example, in some embodiments, as shown in FIG21A , the distance Q between the first heat dissipation structure 3210 and the reflector 204 is 2 mm to 3 mm, such as 2.2 mm, 2.4 mm, 2.5 mm, 2.6 mm, or 2.8 mm, thereby facilitating airflow between the first heat dissipation structure 3210 and the reflector 204 to enhance heat exchange capability.

[0169] For example, in some embodiments, as shown in FIG21A and FIG21B , the first heat dissipation columns 3221 arranged in multiple rows and columns may include the first heat dissipation columns 3221 in the Nth row and the first heat dissipation columns 3221 in the N+1th row, and the first heat dissipation columns 3221 in the Nth row and the first heat dissipation columns 3221 in the N+1th row are staggered in the row direction, where N is a positive integer greater than or equal to 1. For example, the row direction may be the R1 direction in FIG21B , and the column direction may be the R2 direction in the figure. In other embodiments, the row and column directions may be interchangeable.

[0170] For example, N is equal to a positive integer such as 1, 2, 3, 4, or 5. In this case, the first heat dissipation columns 3221 in each two adjacent rows are staggered in the row direction. That is, the first heat dissipation column 3221 in the Nth row of first heat dissipation columns 3221 and the first heat dissipation column 3221 in the N+1th row of first heat dissipation columns 3221 are not aligned in the column direction. For example, the first heat dissipation column 3221 in the N+1th row of first heat dissipation columns 3221 corresponds to a position between the first heat dissipation column 3221 and the second heat dissipation column 3221 in the Nth row of first heat dissipation columns 3221. For example, the first heat dissipation column 3221 in the Nth row of first heat dissipation columns 3221 and the first heat dissipation column 3221 in the N+2th row of first heat dissipation columns are aligned in the row direction.

[0171] For example, in some embodiments, as shown in FIG21A and FIG21B , the first heat dissipation pillars 3221 arranged in multiple rows and columns may include an M-th column of first heat dissipation pillars 3221 and an M+1-th column of first heat dissipation pillars 3221, and the M-th column of first heat dissipation pillars 3221 and the M+1-th column of first heat dissipation pillars 3221 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, the first heat dissipation pillars 3221 in each adjacent column are staggered in the column direction, that is, the first heat dissipation pillar 3221 in the M-th row of first heat dissipation pillars 3221 and the first heat dissipation pillar 3221 in the M+1-th row of first heat dissipation pillars 3221 are not aligned in the column direction. For example, the first heat dissipation pillar 3221 in the M+1-th row of first heat dissipation pillars 3221 corresponds to a position between the first heat dissipation pillar 3221 and the second heat dissipation pillar 3221 in the M-th row of first heat dissipation pillars 3221. For example, the first heat dissipation columns 3221 in the Mth row and the first heat dissipation columns 3221 in the M+2th row are aligned in the row direction.

[0172] In this way, the airflow can fully contact the surface of each first heat dissipation column 3221 and take away the heat of the multiple first heat dissipation columns 3221, thereby 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 sidewall 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 the first heat dissipation columns 3221 in two adjacent rows relative to the sidewall 3201 may be different, thereby extending the airflow path and allowing the airflow to remove more heat during flow.

[0174] For example, in some embodiments, as shown in FIG39A , the plurality of second heat dissipation structures 3220 may also include second heat dissipation columns 3222 arranged in multiple rows and columns. For example, the arrangement and height setting of the plurality of second heat dissipation columns 3222 can be found in the description of the first heat dissipation columns 3221 in the above embodiment and will not be repeated here. This can enhance the flow path of the airflow along the surfaces of the plurality of second heat dissipation columns 3222, thereby allowing the airflow to carry away more heat.

[0175] For example, in some embodiments, as shown in FIG39A , the plurality of first heat dissipation structures 3210 may include a plurality of first heat dissipation ribs 3231 spaced apart from each other. For example, the plurality of first heat dissipation ribs 3231 may be evenly arranged with the same pitch, where the pitch between adjacent first heat dissipation ribs 3231 refers to the distance between the centers of adjacent first heat dissipation ribs 3231. For example, in some embodiments, the pitch between adjacent first heat dissipation ribs 3231 may be 7 mm to 8 mm, such as 7.2 mm, 7.3 mm, 7.5 mm, or 7.8 mm, to ensure smooth airflow and remove more heat.

[0176] For example, in some embodiments, as shown in FIG39A , the angle between the first heat dissipating ribs 3231 and the sidewall 3201 may be 85° to 90°. FIG39A shows an angle of 90° between the first heat dissipating ribs 3231 and the sidewall 3201. For example, in some embodiments, the angle between the first heat dissipating ribs 3231 and the sidewall 3201 may be less than 90°, that is, the first heat dissipating ribs 3231 may be tilted relative to the sidewall 3201. For example, the inclination direction of the plurality of first heat dissipating ribs 3231 relative to the sidewall 3201 may be the same, for example, and the inclination angles of the first heat dissipating ribs 3231 relative to the sidewall 3201 may be 85°, 86°, 87°, or 89°, etc. As shown in Figures 5 and 39A, when multiple first heat dissipation bars 3231 are inclined relative to the side wall 3201, on the one hand, the space occupied by 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 bars 3231 can be extended, thereby enhancing the heat exchange effect.

[0177] For example, in some embodiments, as shown in FIG39A , the second heat dissipation structure 3220 may also include a plurality of second heat dissipation bars 3232 spaced apart from each other. For example, the arrangement of the plurality of second heat dissipation structures 3220 can be found in the description of the first heat dissipation structure in the above embodiment and will not be repeated here. This can enhance the flow path of airflow along the surfaces of the plurality of second heat dissipation structures 3220, thereby allowing the airflow to carry away more heat.

[0178] For example, in some embodiments, as shown in Figures 5 and 39A, the first air duct wall CV1 further includes a plurality of third heat dissipation structures 3230, which are located on the inner wall of the first air duct wall CV1 near the cavity U0. For example, as shown in Figure 39A, the third heat dissipation structures 3230 in the first air duct wall CV1 include a plurality of third heat dissipation ribs 3233, which are arranged in a row. For example, the plurality of third heat dissipation ribs 3233 include a first sub-heat dissipation rib 3301 and a second sub-heat dissipation rib 3302, wherein the first sub-heat dissipation rib 3301 is closer to the center of the first air duct wall CV1 than the second sub-heat dissipation rib 3302, and the first sub-heat dissipation rib 3301 extends less than the second sub-heat dissipation rib 3302. For example, in some embodiments, the first air duct wall CV1 includes a plurality of first sub-heat dissipation ribs 3301 and second sub-heat dissipation ribs 3302 located on both sides of the plurality of first sub-heat dissipation ribs 3301. For example, FIG39A illustrates an example in which two second sub-heat dissipation ribs 3302 are disposed on both sides of the plurality of first sub-heat dissipation ribs 3301, but the embodiments of the present disclosure are not limited thereto. By including first sub-heat dissipation ribs 3301 and second sub-heat dissipation ribs 3302 of different extension lengths in the first air duct wall CV1, the disturbance of the airflow can be enhanced, and the second sub-heat dissipation ribs 3302 have a larger contact area with the airflow, thereby facilitating the airflow to carry away more heat during flow, thereby facilitating the heat dissipation on both sides of the central portion of the first air duct wall CV1.

[0179] For example, in some embodiments, as shown in FIG39A , the first heat dissipation structure 3210 of the first air duct wall CV1 further includes a connection structure 3250, and adjacent first heat dissipation structures 3210 (e.g., adjacent first heat dissipation bars 3231) can be connected via the connection structure 3250. For example, at least a portion of the connection structure 3250 can be located between adjacent first heat dissipation bars 3231. The plurality of first heat dissipation bars 3231 can include adjacent first heat dissipation bar sections 3241 and second heat dissipation bar sections 3242. The first heat dissipation bar section 3241 includes a first opening 4351, and the second heat dissipation bar section 3242 includes a second opening (not shown in the figure, refer to the structure of the first opening 4351). The connection structure 3250 can be inserted into the first opening 4351 and the second opening. For example, the first opening 4351 passes through the first heat dissipation rib 3241, and the second opening passes through the second heat dissipation rib 3242. Therefore, when the connecting structure 3250 is inserted into the first opening 4351 and the second opening, the first heat dissipation rib 3241 and the second heat dissipation rib 3242 are connected. This arrangement can enhance the disturbance of the airflow through the connecting structure 3250, extend the flow path of the airflow, and achieve a good heat dissipation effect.

[0180] For example, as shown in FIG39A , the connection structure 3250 can be plate-shaped and integral. The minimum distance G between the connection structure 3250 and the end of the first heat dissipation grid 3231 away from the side wall 3201 can be, for example, 10 mm to 15 mm, 12 mm to 16 mm, 14 mm to 18 mm, or 17 mm to 20 mm. This allows for enhanced airflow disturbance at different locations according to design requirements, thereby achieving a corresponding heat dissipation effect.

[0181] For example, in some embodiments, referring to FIG39A , the connection structure 3250 may include a plurality of connection blocks (see the connection blocks 3250 in FIG41B ), the plurality of connection blocks being sequentially spaced apart along the arrangement direction of the plurality of first heat dissipation bars 3231, with each connection block being located between adjacent first heat dissipation bars 3231. For example, the plurality of connection blocks of the connection structure 3250 are arranged in a row, with each connection block contacting the first heat dissipation bars 3231 on either side thereof and being sandwiched between the first heat dissipation bars 3231 on either side thereof to achieve fixation.

[0182] For example, in some embodiments, as shown in FIG39A , the first air duct wall CV1 may include 2 to 6 connection structures 3250, such as 2, 3, 4, 5, or 6, and adjacent connection structures 3250 are spaced apart from each other. That is, multiple rows (e.g., 2 to 6 rows) of connection blocks may be provided in the first air duct wall CV1, thereby further enhancing the degree of disturbance to the airflow and improving heat dissipation capabilities. For example, the distance between adjacent connection structures 3250 may be 4 mm to 8 mm, such as 4 mm to 5 mm, 5 mm to 6 mm, or 7 mm to 8 mm, and may be set based on design requirements.

[0183] For example, in some embodiments, referring to FIG39A , the distances G of multiple connection blocks in the same connection structure 3250 relative to the end of the first heat dissipation bar 3231 may be different. For example, a portion of the connection structure 3250 is closer to the root of the first heat dissipation bar 3231 (i.e., the end close to the side wall 3201), and a portion of the connection structure 3250 is closer to the end of the first heat dissipation bar 3231 away from the side wall 3201, thereby making it possible to more flexibly change the flow path of the airflow.

[0184] Figures 40A to 46B are cloud plots of simulation analysis results for the optical structure provided by the embodiments of the present disclosure; Figure 47 is a summary of the results corresponding to the cloud plots in Figures 40A to 46B. In Figure 47, the abscissa represents the number of connection structures in the first heat dissipation structure 3210, and the ordinate represents the maximum temperature of the first heat dissipation ribs 3231. For example, Figures 40A to 46B correspond to the optical structure shown in Figures 1 and 39A, where the temperatures of the second heat dissipation structure 3220 and the third heat dissipation structure 3230 are both approximately 38°C.

[0185] For example, as shown in Figures 40A, 40B, and 47, the first heat dissipation structure 3210 of the first air duct wall CV1 lacks a connecting structure, and instead, multiple first heat dissipation ribs 3231 are spaced apart. Along the arrangement of the multiple first heat dissipation ribs 3231, the thickness of the first heat dissipation ribs 3231 is 1 mm, and the number of first heat dissipation ribs 3231 is 20. As shown in Figure 40A, the temperature of the first heat dissipation ribs 3231 is relatively high, reaching a maximum of 50.9°C. This indicates that heat from the multiple first heat dissipation structures 3210 within the second cavity U2 (see Figure 5) is not being efficiently transferred outside of the second cavity U2.

[0186] For example, as shown in Figures 41A, 41B, and 47, the first heat dissipation structure 3210 of the first air duct wall CV1 is provided with a connection structure 3250, which includes multiple connection blocks. Multiple first heat dissipation bars 3231 are arranged in a sequentially spaced arrangement. Along the arrangement direction of the multiple first heat dissipation bars 3231, the thickness of the first heat dissipation bars 3231 is 1 mm, and the number of the multiple first heat dissipation bars 3231 is 20. As shown in Figure 41A, the temperature of the first heat dissipation bars 3231 drops slightly, reaching a maximum temperature of 47°C. This indicates that some heat from the multiple first heat dissipation structures 3210 located within the second cavity U2 (see Figure 5) is transferred outside the second cavity U2.

[0187] For example, as shown in Figures 42A, 42B, and 47, the first heat dissipation structure 3210 of the first air duct wall CV1 is provided with two connection structures 3250, each including multiple connection blocks. Multiple first heat dissipation bars 3231 are sequentially spaced apart. Along the arrangement direction of the multiple first heat dissipation bars 3231, the thickness of the first heat dissipation bars 3231 is 1 mm, and the number of the multiple first heat dissipation bars 3231 is 20. As shown in Figure 42A, the temperature of the first heat dissipation bars 3231 continues to decrease, reaching a maximum temperature of 46.5°C. Compared to Figures 41A and 41B, the heat from the multiple first heat dissipation structures 3210 located within the second cavity U2 (see Figure 5) has been further transferred outside the second cavity U2.

[0188] For example, as shown in Figures 43A, 43B, and 47, the first heat dissipation structure 3210 of the first air duct wall CV1 is provided with three connection structures 3250, and the remaining structure is the same as the corresponding optical structure in Figure 41A. As shown in Figure 43A, the temperature of the first heat dissipation ribs 3231 continues to decrease, reaching a maximum temperature of 46.4°C. Compared with Figures 42A and 42B, the maximum temperature of the first heat dissipation ribs 3231 has decreased by 0.1°C.

[0189] For example, as shown in Figures 44A, 44B, and 47, the first heat dissipation structure 3210 of the first air duct wall CV1 is provided with four connection structures 3250, and the remaining structure is the same as the corresponding optical structure in Figure 41A. As shown in Figure 44A, the temperature of the first heat dissipation ribs 3231 continues to decrease, reaching a maximum temperature of 46.2°C. Compared with Figures 43A and 43B, the maximum temperature of the first heat dissipation ribs 3231 has decreased by 0.2°C.

[0190] For example, as shown in Figures 45A, 45B, and 47, the first heat dissipation structure 3210 of the first air duct wall CV1 is provided with five connection structures 3250, and the remaining structure is the same as the corresponding optical structure in Figure 41A. As shown in Figure 45A, the temperature of the first heat dissipation ribs 3231 continues to decrease, reaching a maximum temperature of 46.1°C. Compared with Figures 44A and 44B, the maximum temperature of the first heat dissipation ribs 3231 has decreased by 0.1°C.

[0191] For example, as shown in Figures 46A, 46B, and 47, the first heat dissipation structure 3210 of the first air duct wall CV1 is provided with six connection structures 3250, and the remaining structure is the same as the corresponding optical structure in Figure 41A. As shown in Figure 46A, the temperature of the first heat dissipation ribs 3231 continues to decrease, reaching a maximum temperature of 46°C. Compared with Figures 45A and 45B, the maximum temperature of the first heat dissipation ribs 3231 has decreased by 0.1°C.

[0192] The simulation results above show that compared to not having a connecting structure 3250, the maximum temperature of the first heat dissipation structure 3210 of the first air duct wall CV1 decreases significantly when one connecting structure 3250 is provided. However, when two to six connecting structures 3250 are provided in the first heat dissipation structure 3210 of the first air duct wall CV1, the maximum temperature of the first heat dissipation ribs 3231 does not change much. Because having too many connecting structures 3250 increases manufacturing difficulty, after comprehensive consideration, providing two connecting structures 3250 in the first heat dissipation structure 3210 is an option.

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

[0194] At least one embodiment of the present disclosure provides a projection device including the optical structure provided in an embodiment of the present disclosure. The projection device can have better heat dissipation and display effects.

[0195] There are a few points to note:

[0196] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to conventional designs.

[0197] (2) For the sake of clarity, the thicknesses of layers or regions in the drawings used to describe the embodiments of the present disclosure are exaggerated or reduced, i.e., these drawings are not drawn to scale. It is understood that when an element is referred to as being "on" or "under" another element, the element may be "directly" on or "under" the other element, or intervening elements may be present.

[0198] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to form new embodiments.

[0199] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. The protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An optical structure, having a light source assembly and a display assembly, Among them, The display assembly is located on the light-emitting side of the light source assembly. The display assembly includes 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 includes a blower, a first air duct wall, and a second air duct wall. In a second direction, the blower 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, and one end of the first connecting portion extends to the contour edge of the first lens. The second air duct wall includes a second connecting portion, and 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 of A mm. The minimum distance between the second lens and the second connecting portion in the second direction is a second distance of 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×M≤A≤12, 4.2≤C≤N.

2. The optical structure according to claim 1, wherein, 0.62×M≤A≤12, 4.2≤C≤0.804×N.

3. The optical structure according to 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 includes a first extension portion, which is located on the side of the reflector away from the blower, and at least part of the first extension portion is parallel to the first plane. The orthographic projection of the first extension portion on the first plane at least partially overlaps with the orthographic projection of the reflector on the first plane. The second cover plate further includes a second extension portion, which is located on the side of the reflector away from the blower, and at least part of the second extension portion is parallel to the first plane. The orthographic projection of the second extension portion on the first plane at least partially overlaps with the orthographic projection of the reflector on the first plane. In the second direction, the minimum distance between the first extension portion and the second extension portion is B millimeters, where B > A, and / or B > C.

6. The optical structure according to claim 5, wherein, The minimum distance B between the first extension portion and the second extension portion satisfies: 9.0≤B≤13.

0.

7. The optical structure according to claim 3, wherein, The first air duct wall further includes a first inclined portion. The first extension portion is connected to the first connection portion through the first inclined portion. The first inclined portion includes an opposite first end and a second end. The first end is connected to the first connection portion, and the second end is connected to the first extension portion. The first end is farther from the blower than the second end. The second air duct wall further includes a second inclined portion. The second extension portion is connected to the second connection portion through the second inclined portion. The second inclined portion includes an opposite third end and a fourth end. The third end is connected to the second connection portion, and the fourth end is connected to the second extension portion. The third end is farther from the blower than the fourth end. The angle between the first inclined portion and the first plane is a first included angle, and the angle between the second inclined portion and the first plane is a second included angle. The ratio of the second included angle to the first included angle is 1.5 to 3.

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

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

10. The optical structure according to claim 9, wherein, The radius of curvature of the first arc is greater than the radius of curvature of the second arc.

11. The optical structure according to claim 9 or 10, wherein, The radius of curvature of the first arc is 15 mm to 18 mm, and the radius of curvature of the second arc is 5 mm to 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 includes a first extension member and a second extension member, and a connecting member located between the first extension member and the second extension member. At least a part of the end of the reflector away from the blower is in contact and cooperation with the connecting member. There is a first cavity between the reflector and the second lens. There is a second cavity on the side of the reflector away from the first cavity. There is a third cavity between the first air duct wall and the second air duct wall. The first extension member has at least one first opening, and the second extension member has at least one second opening. The first cavity communicates with the third cavity through the first opening, and the second cavity communicates with the third cavity through the second opening. The opening area of the at least one first opening is smaller than the opening area of the at least one second opening.

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

14. The optical structure according to claim 12 or 13, wherein, The opening area of the at least one first opening is 12% to 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, wherein the optical structure further includes a heat dissipation element located in the second cavity, where The orthographic projection area of the at least one second opening on the first plane is larger than the orthographic projection area of the heat dissipation element on the first plane.

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

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

18. The optical structure according to claim 12, wherein, The connecting member of the second air duct wall includes a first edge close to the second opening, the second inclined portion of the second air duct wall includes 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. At least one of the first openings in the first extension member is arranged along the first edge.

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

20. The optical structure according to any one of claims 1 to 19, wherein, There is a flow passage between the first lens and the second lens, and the dimension of the flow passage in the first direction is smaller than the dimension of the blower in the second direction.

21. The optical structure according to claim 20 further includes a heat insulation element, and the heat insulation element is 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 blower in the second direction is F, then M1 + M2 + N < F.

22. The optical structure according to any one of claims 1 to 21, wherein, The first air duct wall further includes a side cover portion, the side cover portion is located on the side of the reflector away from the display panel, and the side cover portion includes a side wall and a plurality of first heat dissipation structures and a plurality of second heat dissipation structures connected to the side wall. There is a first cavity between the reflector and the second lens, and a second cavity is formed on the side of the reflector away from the first 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 from the reflector.

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

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

25. The optical structure according to any one of claims 22 to 24, wherein, The heights of the plurality of first heat dissipation structures are different.

26. The optical structure according to claim 22 or 23, wherein, The plurality of first heat dissipation structures include a plurality of first heat dissipation columns arranged in multiple rows and multiple columns, or the plurality of first heat dissipation structures include a plurality of first heat dissipation bar grids arranged at intervals; and / or The plurality of second heat dissipation structures include second heat dissipation columns arranged in multiple rows and multiple columns, or the second heat dissipation structure includes a plurality of second heat dissipation bar grids arranged at intervals.

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

28. The optical structure according to any one of claims 22 to 25, wherein, The plurality of first heat dissipation structures include a plurality of first heat dissipation bar grids arranged at intervals and a connection structure. Adjacent first heat dissipation bar grids are connected through the connection structure.

29. The optical structure according to claim 28, wherein, The plurality of first heat dissipation bar grids include an adjacent first heat dissipation bar grid part and a second heat dissipation bar grid part. The first heat dissipation bar grid part includes a first opening part, and the second heat dissipation bar grid part includes a second opening part. The connection structure is inserted into the first opening part and the second opening part to connect the first heat dissipation bar grid part and the second heat dissipation bar grid part.

30. The optical structure according to claim 28 or 29, wherein, The minimum distance between the connection structure and the end of the first heat dissipation bar grid away from the side wall is 10 mm to 20 mm.

31. The optical structure according to claim 28, wherein, The connection structure includes a plurality of connection blocks. The plurality of connection blocks are arranged at intervals in sequence along the arrangement direction of the plurality of first heat dissipation bar grids. The connection blocks are located between adjacent first heat dissipation bar grids.

32. The optical structure according to any one of claims 28 to 31, wherein, The included angle between the first heat dissipation bar grid and the side wall is 85° to 90°.

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

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