Projection optical engine and projection device

Abstract

A projection optical engine, comprising: a housing (100), a lens assembly (200), an internal circulation fan (1400) and an air guide duct (FD). The housing (100) is used for forming a closed chamber, the closed chamber comprises an illumination cavity (120) and an imaging cavity (110), the lens assembly (200) is arranged in the imaging cavity (110), and the internal circulation fan (1400) is arranged in the illumination cavity (120). The air guide duct (FD) is arranged at the junction between the illumination cavity (120) and the imaging cavity (110), an air inlet of the air guide duct (FD) faces the illumination cavity (120), an air outlet of the air guide duct (FD) faces the imaging cavity (110), and the air guide duct (FD) is used for guiding the airflow blown by the internal circulation fan (1400) into the imaging cavity (110). An included angle between the air outlet direction (fo) of the air guide duct (FD) and the normal direction (fn) of the lens assembly (200) is less than or equal to 90°, and the normal direction of the lens assembly (200) faces away from the lens assembly (200). Also provided is a projection device.

Description

Projection optical engine and projection device Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a projection optical engine and a projection device. Background Technology

[0002] With the continuous advancement of LCD technology, the market demand for LCD projection optical engines has shown significant growth in recent years. However, the traditional open-type optical engine design has long suffered from insufficient lifespan due to its weak dust and water resistance, a deficiency that has limited market acceptance. To address this challenge, mainstream LCD projection optical engine designs are gradually shifting towards a sealed structure. The sealed optical engine design ensures that the imaging cavity and lens are isolated from the external environment, thus providing better protection against dust and water.

[0003] Overview

[0004] This disclosure provides a projection optical engine, including: a housing, a lens assembly, an internal circulation fan, and an air guide channel. The housing is used to form a sealed chamber, the sealed chamber including an illumination chamber and an imaging chamber. The lens assembly is disposed in the imaging chamber, and the internal circulation fan is disposed in the illumination chamber.

[0005] The air guide channel is located at the junction of the illumination cavity and the imaging cavity. The air inlet of the air guide channel faces the illumination cavity, and the air outlet of the air guide channel faces the imaging cavity. The air guide channel is used to guide the airflow blown out by the internal circulation fan into the imaging cavity.

[0006] Wherein, the angle between the air outlet direction of the air guide channel and the normal direction of the lens assembly is less than or equal to 90°, and the normal direction of the lens assembly is away from the lens assembly.

[0007] In some embodiments, the internal circulation fan includes a first air outlet, the housing includes an arc-shaped corner, the arc-shaped corner and the first air outlet are disposed on opposite sides of the illumination cavity along a first direction, the channel wall of the air guide channel is connected to the arc-shaped corner, and the first direction is substantially parallel to the normal direction of the lens assembly.

[0008] In some embodiments, the projection optical engine further includes:

[0009] The display component and the limiting part are both located in the sealed cavity. The limiting part is used to limit the position of the display component in the first direction. The limiting part is connected to the edge of the arc-shaped corner near the imaging cavity.

[0010] The limiting part is provided with at least one first opening, which penetrates the limiting part in the direction from the illumination cavity to the imaging cavity. The at least one first opening constitutes the air guide channel, and the limiting part constitutes the channel wall of the air guide channel.

[0011] In some embodiments, the limiting portion includes:

[0012] A first plate and a second plate, the first plate being connected between the second plate and the arc-shaped corner, the second plate and the arc-shaped corner being located on the side of the first plate closer to the lighting cavity, the surface of the second plate facing away from the arc-shaped corner abutting against the display component to define the position of the display component in the first direction, the first opening being disposed on the first plate, the first plate constituting the channel wall of the air guide channel.

[0013] In some embodiments, the limiting portion is provided with a plurality of first openings, and the plurality of first openings are arranged sequentially along the long side of the display component.

[0014] In some embodiments, the channel wall of the air guide channel includes an air guide duct, at least a portion of which is disposed outside the sealed chamber.

[0015] In some embodiments, the internal circulation fan includes a first air outlet, and the housing includes:

[0016] An arc-shaped corner, wherein the arc-shaped corner is disposed on both sides of the lighting cavity opposite to the first air vent along a first direction; and

[0017] An imaging housing is located around the imaging cavity and is connected to the end of the arc-shaped corner near the imaging cavity.

[0018] The first opening of the air duct is connected to the arc-shaped corner, and the second opening passes through the imaging housing and extends into the imaging cavity.

[0019] In some embodiments, the channel wall of the air guide channel further includes:

[0020] A first air guide groove is disposed inside the imaging cavity. The opening of the first air guide groove is connected to the second pipe opening. The first air guide groove is located on the side of the air guide pipe near the lens assembly, and the bottom of the first air guide groove extends into the gap between the lens assembly and the imaging housing. A plurality of second openings are provided on the groove wall of the first air guide groove facing the imaging cavity. The second openings are used to connect the imaging cavity and the air guide channel formed by the air guide pipe and the first air guide groove.

[0021] In some embodiments, the connection corner between the first air guide groove facing the imaging cavity and the air guide duct is chamfered.

[0022] In some embodiments, the second port is offset relative to the first port toward the side closer to the lens assembly.

[0023] In some embodiments, in the first direction, the distances between the first port and the second port and the lens assembly are approximately equal.

[0024] In some embodiments, the projection optical engine further includes:

[0025] A fixing plate and a second air guide channel are both disposed within the imaging cavity. The fixing plate is located on the side of the second air guide channel away from the lens assembly. The fixing plate is in contact with the opening of the second air guide channel to seal the opening of the second air guide channel. A third opening is provided on the channel wall of the second air guide channel facing the air guide pipe. The third opening is connected to the second pipe opening. The bottom of the second air guide channel is opposite to and separated from the lens assembly. A plurality of air holes are provided on the bottom of the second air guide channel. The air holes are used to connect the imaging cavity and the air duct formed by the second air guide channel and the fixing plate.

[0026] In some embodiments, the second air guide groove is an annular groove, and the plurality of air holes are arranged circumferentially along the annular groove, and the plurality of air holes are rotationally symmetrical with respect to the normal direction of the lens assembly.

[0027] In some embodiments, the bottom of the second air guide groove includes a proximal end near the third opening, a distal end away from the third opening, and an intermediate section located between the proximal end and the distal end, wherein the air hole spacing at the proximal end and / or the air hole spacing at the distal end is less than or equal to the air hole spacing at the intermediate section.

[0028] In some embodiments, the air duct includes:

[0029] A first sub-air guide pipe, a connecting part, and a second sub-air guide pipe are connected in sequence. The first sub-air guide pipe is also connected to the arc-shaped corner, and the second sub-air guide pipe is also connected to the second air guide groove. The diameter of the second sub-air guide pipe is smaller than the diameter of the first sub-air guide pipe. A stepped structure is formed at the position where the first sub-air guide pipe, the connecting part, and the second sub-air guide pipe are connected.

[0030] The second sub-air guide pipe has one end near the second air guide groove inserted into the third opening. The inner surface of the third opening wall is in contact with the outer surface of the second sub-air guide pipe wall. The surface of the second air guide groove facing the first sub-air guide pipe is in contact with the connecting part.

[0031] In some embodiments, the fixing plate is disposed on the inner wall of the imaging housing and is an integral structure with the imaging housing, and the connection between the second air guide groove and the fixing plate is a detachable connection.

[0032] In some embodiments, the second opening is a flat opening, and the dimension of the flat opening along the second direction is greater than or equal to twice the dimension of the flat opening along the first direction, wherein the second direction is perpendicular to the first direction.

[0033] In some embodiments, the channel wall of the air guide channel is an integral structure with the housing.

[0034] In some embodiments, the projection optical engine further includes:

[0035] A return air duct is disposed at the junction of the illumination cavity and the imaging cavity. The air inlet of the return air duct faces the imaging cavity, and the air outlet of the return air duct faces the illumination cavity. The return air duct is used to guide the airflow in the imaging cavity back to the illumination cavity. The return air duct and the air guide duct are disposed opposite to each other on both sides of the sealed chamber along the first direction. The return air duct is located on the side of the internal circulation fan closer to the imaging cavity.

[0036] In some embodiments, the projection optical engine further includes:

[0037] The display assembly includes a display panel and a frame. The frame is disposed around the display panel and is used to fix the display panel. A plurality of fourth openings are provided on the frame on the side of the display panel away from the arc corner. The fourth openings penetrate the frame along the direction from the imaging cavity to the illumination cavity. The plurality of fourth openings are arranged sequentially along the long side of the display assembly. The plurality of fourth openings constitute the return air channel, and the frame constitutes the channel wall of the return air channel.

[0038] In some embodiments, the internal circulation fan further includes:

[0039] The second air vent is located on the side of the internal circulation fan away from the first air vent. The first air vent is the air outlet of the internal circulation fan, and the second air vent is the air return vent of the internal circulation fan.

[0040] In some embodiments, the internal circulation fan further includes:

[0041] The second air vent is located on the side of the internal circulation fan away from the first air vent. In the case that no return air channel is provided in the sealed cavity, the first air vent is the return air vent of the internal circulation fan, and the second air vent is the air outlet of the internal circulation fan. The return air channel is used to guide the airflow in the imaging cavity back to the illumination cavity.

[0042] In some embodiments, the projection optical engine further includes:

[0043] Internal circulation fan; and

[0044] The display assembly includes a display panel and a frame. The frame is disposed around the display panel and is used to fix the display panel. A plurality of fourth openings are provided on the frame on the side of the display panel near the internal circulation fan. The fourth openings penetrate the frame along the direction from the imaging cavity to the illumination cavity. The plurality of fourth openings are arranged sequentially along the long side of the display assembly and form the air guide channel. The frame forms the channel wall of the air guide channel.

[0045] In some embodiments, the internal circulation fan includes:

[0046] The first air vent is positioned close to the display component; and

[0047] The second air vent is located on the side of the internal circulation fan away from the first air vent. The first air vent is the return air vent of the internal circulation fan, and the second air vent is the air outlet of the internal circulation fan.

[0048] In some embodiments, the ratio of the air inlet area to the air outlet area of ​​the air guide channel is greater than or equal to 1 and less than or equal to 1.2.

[0049] In some embodiments, the lens assembly includes a lens with a hydrophobic film on its surface, the hydrophobic film being used to make the lens exhibit hydrophobicity.

[0050] In some embodiments, a self-adhesive material is provided on the inner wall of the housing, and the main component of the self-adhesive material is resin.

[0051] This disclosure provides a projection optical engine, including: a housing, a lens assembly, an internal circulation fan, and an air guide channel. The housing is used to form a sealed chamber, the sealed chamber including an illumination chamber and an imaging chamber. The lens assembly is disposed in the imaging chamber, and the internal circulation fan is disposed in the illumination chamber.

[0052] The air guide channel is located at the junction of the illumination cavity and the imaging cavity. The air inlet of the air guide channel faces the illumination cavity, and the air outlet of the air guide channel faces the imaging cavity. The air guide channel is used to guide the airflow blown out by the internal circulation fan into the imaging cavity.

[0053] The internal circulation fan includes a first air outlet, the housing includes an arc-shaped corner, the arc-shaped corner and the first air outlet are disposed opposite to each other on both sides of the illumination cavity along a first direction, the channel wall of the air guide channel is connected to the arc-shaped corner and disposed close to the arc-shaped corner, and the first direction is approximately parallel to the normal direction of the lens assembly.

[0054] This disclosure provides a projection optical engine, including: a housing, a lens assembly, an internal circulation fan, and an air guide channel. The housing is used to form a sealed chamber, the sealed chamber including an illumination chamber and an imaging chamber. The lens assembly is disposed in the imaging chamber, and the internal circulation fan is disposed in the illumination chamber.

[0055] The air guide channel is located at the junction of the illumination cavity and the imaging cavity. The air inlet of the air guide channel faces the illumination cavity, and the air outlet of the air guide channel faces the imaging cavity. The air guide channel is used to guide the airflow blown out by the internal circulation fan into the imaging cavity.

[0056] The air guide channel includes an air guide pipe in its channel wall, and at least a portion of the air guide pipe is disposed outside the sealed chamber.

[0057] This disclosure provides a projection apparatus including a projection optical engine as described in any one of the claims.

[0058] The above description is merely an overview of the technical solution disclosed herein. In order to better understand the technical means of this disclosure and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this disclosure more apparent and understandable, specific examples of this disclosure are given below.

[0059] Brief description of the attached diagram

[0060] To more clearly illustrate the technical solutions in the embodiments or related technologies of this disclosure, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the scale in the drawings is for illustration only and does not represent the actual scale.

[0061] Figure 1 illustrates a schematic diagram of the front view structure of a projection optical engine;

[0062] Figure 2 illustrates a schematic side view of a projection optical engine;

[0063] Figure 3 illustrates a schematic diagram of the perspective structure of a projection optical engine;

[0064] Figure 4 illustrates a schematic cross-sectional view of a projection optical engine;

[0065] Figure 5 illustrates a schematic diagram of a combined structure of a projection optical engine;

[0066] Figure 6 illustrates a schematic diagram of the housing structure of a projection optical engine;

[0067] Figure 7 illustrates a schematic cross-sectional view of the housing of a projection optical engine;

[0068] Figure 8 illustrates a schematic diagram of an internal circulation fan;

[0069] Figure 9 illustrates a detailed structural diagram of an internal circulation fan;

[0070] Figure 10 illustrates a schematic cross-sectional view of an internal circulation fan;

[0071] Figure 11 illustrates an exemplary structural diagram of an internal circulation fan rotating counterclockwise;

[0072] Figure 12 illustrates an exemplary schematic diagram of an internal circulation fan rotating clockwise;

[0073] Figure 13 shows a schematic cross-sectional view of the first example of a projection optical engine;

[0074] Figure 14 illustrates a detailed structural diagram of the first example of a projection optical engine;

[0075] Figure 15 shows an exemplary structural schematic diagram of a plastic frame;

[0076] Figure 16 illustrates a schematic cross-sectional view of a second example projection optical engine;

[0077] Figure 17 illustrates a detailed structural diagram of a second example projection optical engine;

[0078] Figure 18 illustrates a schematic cross-sectional view of a third example of a projection optical engine;

[0079] Figure 19 illustrates a detailed structural diagram of a third example of a projection optical engine;

[0080] Figure 20 illustrates a schematic cross-sectional view of the fourth example of a projection optical engine;

[0081] Figure 21 illustrates a detailed structural diagram of the fourth example of a projection optical engine;

[0082] Figure 22 shows an exemplary cross-sectional view of the fifth projection optical engine example;

[0083] Figure 23 illustrates a detailed structural diagram of the fifth example projection optical engine;

[0084] Figure 24 illustrates a detailed structural diagram of the fifth example of a projection optical engine;

[0085] Figure 25 shows an exemplary structural schematic diagram of the second air guide trough;

[0086] Figure 26 shows an exemplary schematic diagram of the assembly structure of the second air guide duct;

[0087] Figure 27 shows an exemplary cross-sectional view of the sixth projection optical engine example;

[0088] Figure 28 illustrates, exemplarily, a schematic diagram of the location of the adhesive on the inner wall of the housing;

[0089] Figure 29 illustrates a schematic diagram of the lens structure of a lens assembly.

[0090] Detailed description

[0091] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0092] While a sealed optical engine structure offers better dust and water resistance, it limits the lens's ability to rapidly exchange temperature and humidity with the external environment. When there is a significant difference in temperature and humidity between the projector's interior and exterior, condensation easily forms on the lens surface. This condensation often doesn't dissipate naturally within a short time and cannot be removed by wiping. This condensation not only reduces image clarity but also severely impacts the user experience. Therefore, solving the condensation problem in sealed optical engines is crucial for improving the user experience.

[0093] A schematic diagram of a projection optical engine is illustrated with reference to Figures 1 to 5. Figures 1 to 4 are a front view, side view, perspective view, and sectional view, respectively, and Figure 5 is a schematic diagram of the assembled projection optical engine. As shown in Figures 1 to 5, the projection optical engine is a sealed vertical optical engine, including: a housing 100, optical components, a heat dissipation device, and a display component DP. The housing 100 forms a sealed chamber, and the optical components and the display component DP are located within the sealed chamber.

[0094] The display component DP includes a frame 600 and a display panel 500 fixed inside the frame 600.

[0095] The optical components include a lens assembly 200, an imaging mirror 300, an imaging fractal lens 400, a heat-insulating glass 700, an illumination fractal lens 800, an illumination mirror 900, a plano-convex lens 1000, and a light source 1100. The imaging fractal lens 400 can be fixed within the frame 600. The imaging fractal lens 400 is located on the light-emitting side of the display panel 500, and is separated from the display panel 500.

[0096] The heat dissipation devices include a light source heat dissipation module 1200, a cavity heat sink 1300, an internal circulation fan 1400, and an external circulation fan 1500.

[0097] Referring to Figures 6 and 7, the structure of the housing 100 and the assembly positions of the components are illustrated exemplarily. As shown in Figures 6 and 7, the housing 100 is divided into a left housing 101 and a right housing 102. After all the optical components and heat dissipation components are assembled into the housing 100, the left housing 101 and the right housing 102 are secured with screws. The structures of the left housing 101 and the right housing 102 are symmetrical. Taking the left housing 101 as an example, as shown by the dotted line in Figure 7, the upper half of the housing 100 forms the imaging cavity 110, and the lower half forms the illumination cavity 120. The housing 100 has multiple slots, screw holes, and other fixing structures designed inside for assembling the optical components and heat dissipation components. For example, slot 111 is used to fix lens assembly 200; slot 112 is used to fix imaging reflector 300; slot 121 is used to fix frame 600. During assembly, the imaging fractal lens 400 and display panel 500 can be fixed to frame 600 first, and then frame 600 can be slid into slot 121 from the back of housing 100 to complete assembly; slot 122 is used to fix heat insulation glass 700; slot 123 is used to fix illumination fractal lens 800; slot 124 is used to fix illumination reflector 900; stud 125 is used to fix cavity heat sink 1300. The cavity heat sink 1300 is made of aluminum alloy and is used for heat exchange between the cavity and the outside world to reduce the temperature inside the sealed cavity; slot 126 is used to fix internal circulation fan 1400; slot 127 is used to fix plano-convex lens 1000; screw hole 128 is used to fix light source heat dissipation module 1200. During assembly, the external circulation fan 1500 can be attached to the light source heat dissipation module 1200 with screws, and then fixed together with the light source heat dissipation module 1200 onto the housing 100 through the screw holes 128.

[0098] As shown in Figures 6 and 7, the housing 100 is designed with an arc-shaped corner 130 for connecting the air circulation of the illumination cavity 120 and the imaging cavity 110. The arc-shaped corner 130 is curved, and when the shape of the arc-shaped corner 130 is a continuous tangent curve, it can reduce wind resistance during airflow and optimize circulation efficiency. The arc-shaped corner 130 is, for example, located on the same side of the sealed chamber as the lens assembly 200.

[0099] As shown in Figures 6 and 7, the imaging cavity 110 is a sealed chamber located on the side of the imaging lens 400 away from the display component DP, and the illumination cavity 120 is a sealed chamber located on the side of the imaging lens 400 away from the imaging cavity 110.

[0100] Figures 8 to 10 show schematic diagrams, detailed views, and cross-sectional views of the internal circulation fan 1400. As shown in Figures 8 to 10, the internal circulation fan 1400 includes fan blades 1410, a first air outlet 1420, a fan base 1430, a fan upper shell 1440, and a second air outlet 1450. A limiting post is provided on the side of the fan base 1430 for fixing it to the housing 100, preventing the internal circulation fan 1400 from colliding with the housing 100 during high-speed operation and causing vibration, abnormal noise, or other disturbances. Under the control of the motor and circuit board, the fan blades 1410 can rotate clockwise or counterclockwise. Depending on the rotation direction of the fan blades 1410, the first air outlet 1420 and the second air outlet 1450 can serve as each other's air inlets / outlets to achieve different circulation directions.

[0101] For example, the first air vent 1420 is a flat opening, and the second air vent 1450 is a round opening.

[0102] In some examples, the internal circulation fan 1400 rotates counterclockwise, as shown in Figure 11, with air intake through the second vent 1450 and exhaust through the first vent 1420. In other examples, the internal circulation fan 1400 rotates clockwise, as shown in Figure 12, with air intake through the first vent 1420 and exhaust through the second vent 1450. There is no significant difference in airflow and air pressure between the two rotation directions of the internal circulation fan 1400; only the intake and exhaust positions are affected. The rotation method of the internal circulation fan 1400 can be determined according to actual needs. The internal circulation fan 1400 is mainly used for internal cooling of the cavity to reduce the temperature of optical components.

[0103] This disclosure provides a projection optical engine, as shown in Figures 13, 16, 18, 20, 22 or 27. The projection optical engine includes: a housing 100, a lens assembly 200, an internal circulation fan 1400 and an air guide channel FD. The housing 100 is used to form a sealed chamber, which includes an illumination chamber 120 and an imaging chamber 110. The lens assembly 200 is disposed in the imaging chamber 110, and the internal circulation fan 1400 is disposed in the illumination chamber 120.

[0104] The air guide channel FD is located at the junction of the illumination cavity 120 and the imaging cavity 110. The air inlet of the air guide channel FD faces the illumination cavity 120, and the air outlet of the air guide channel FD faces the imaging cavity 110. The air guide channel FD is used to guide the airflow blown by the internal circulation fan 1400 into the imaging cavity 110. Furthermore, the angle between the air outlet direction fo of the air guide channel FD and the normal direction fn of the lens assembly 200 is less than or equal to 90°, and the normal direction fn of the lens assembly 200 is away from the lens assembly 200.

[0105] It should be noted that the air outlet direction fo of the air guide channel FD refers to the direction perpendicular to the air outlet of the air guide channel FD and pointing towards the imaging cavity 110. The normal direction fn of the lens assembly 200 is perpendicular to the lens of the lens assembly 200 facing the imaging cavity 110.

[0106] This disclosure provides an airflow channel FD at the junction of the illumination cavity 120 and the imaging cavity 110. This allows the airflow generated by the internal circulation fan 1400 within the illumination cavity 120 to flow into the imaging cavity 110 through the airflow channel. This enhances heat exchange between the illumination cavity 120 and the imaging cavity 110, helping to quickly adjust the lens surface temperature to a level similar to that inside the sealed cavity, reducing condensation caused by large temperature differences and effectively suppressing fogging. Furthermore, it improves airflow within the imaging cavity 110, thereby increasing air circulation near the lens and accelerating the removal of fog from the lens. Therefore, this disclosure can eliminate or suppress fogging of the lens assembly, improve the stability and clarity of the projected image, and enhance the user experience.

[0107] This disclosure can improve the environmental adaptability of projectors and greatly enhance the stability and reliability of products, enabling them to provide continuous and high-quality image output in different environments, bringing users a smoother and clearer visual experience.

[0108] Furthermore, by setting the angle between the air outlet direction fo of the air guide channel FD and the normal direction fn of the lens assembly 200 to be less than or equal to 90°, it can be ensured that the airflow blowing from the outlet of the air guide channel FD will not blow directly onto the lens assembly 200, but will instead blow towards areas within the imaging cavity 110 other than the lens assembly 200. The air entering the imaging cavity 110 then flows to the vicinity of the lens assembly 200. On one hand, this design can improve the temperature uniformity of the lens assembly 200, avoiding the temperature unevenness problem caused by the air guide channel FD only blowing air onto a local area of ​​the lens assembly when the airflow blowing directly onto the lens assembly 200. On the other hand, this design can also improve the structural stability of the lens assembly.

[0109] In practical implementation, by precisely controlling the airflow path and speed, the heat distribution within the imaging cavity 110 can be effectively improved, the temperature uniformity of the optical components within the sealed cavity can be enhanced, and the more uniform temperature distribution can also reduce optical distortion and image quality degradation caused by uneven temperature, thereby further improving the stability and clarity of the projected image quality, enhancing the stability of the projection optical engine performance, and effectively overcoming the problem of shortened lifespan of sealed projection optical engines after continuous long-term operation.

[0110] In some examples, as shown in Figures 13, 18, 20, 22 or 27, the internal circulation fan 1400 includes a first air outlet 1420, the housing 100 includes an arc-shaped corner 130, the arc-shaped corner 130 and the first air outlet 1420 are disposed opposite each other on both sides of the lighting cavity 120 along a first direction f1, the channel wall of the air guide channel FD is connected to the arc-shaped corner 130, and the channel wall of the air guide channel FD is disposed close to the arc-shaped corner 130.

[0111] For example, the first direction f1 is approximately parallel to the normal direction fn of the lens assembly 200.

[0112] For example, as shown in FIG13, the channel wall of the air guide channel FD is connected to the edge of the arc corner 130 near the imaging cavity 110.

[0113] For example, as shown in Figures 18, 20, 22 or 27, the channel wall of the air guide duct FD is connected to the arc-shaped area of ​​the arc-shaped corner 130.

[0114] For example, as shown in Figures 13, 18, 20, 22 or 27, the channel wall of the air guide duct FD is an integral structure with the housing 100.

[0115] For example, as shown in Figures 13 and 14, the projection optical engine further includes a limiting part 131, which is located in a sealed cavity and is used to limit the position of the display component DP in the first direction f1. The limiting part 131 is connected to the edge of the arc-shaped corner 130 near the imaging cavity 110.

[0116] For example, as shown in Figures 13 and 14, at least one first opening 140 is provided on the limiting part 131. The first opening 140 penetrates the limiting part 131 in the direction from the illumination cavity 120 to the imaging cavity 110. The at least one first opening 140 provided on the limiting part 131 constitutes the air guide channel FD, and the limiting part 131 constitutes the channel wall of the air guide channel FD.

[0117] The opening 140 facing the imaging cavity 110 forms the air outlet of the air guide channel FD, and the opening facing the illumination cavity 120 forms the air inlet of the air guide channel FD.

[0118] For example, as shown in FIG14, the limiting part 131 includes: a first plate P1 and a second plate P2. The first plate P1 is connected between the second plate P2 and the arc corner 130. The second plate P2 and the arc corner 130 are both located on the side of the first plate P1 near the illumination cavity 120. The surface of the second plate P2 away from the arc corner 130 abuts against the display component DP to limit the position of the display component DP in the first direction f1. The first opening 140 is provided on the first plate P1. The first plate P1 constitutes the channel wall of the air guide channel FD.

[0119] For example, as shown in FIG14, the first plate P1 is parallel to the display component DP, and the second plate P2 is perpendicular to the display component DP. The edge of the first plate P1 near the second plate P2 is connected to the second plate P2, and the edge of the first plate P1 near the arc corner 130 is connected to the edge of the arc corner 130 near the imaging cavity 110.

[0120] For example, as shown in FIG14, the limiting part 131 is provided with a plurality of first openings 140, and the plurality of first openings 140 are arranged sequentially along the long side direction of the display component DP. For example, the plurality of first openings 140 are evenly arranged or equally spaced along the long side direction of the display component DP. The plurality of first openings 140 can be provided on the left shell 101 and the right shell 102, respectively. For example, the limiting part 131 is provided with a total of 8 first openings 140, and the left shell 101 and the right shell 102 are each provided with 4 first openings 140.

[0121] For example, as shown in FIG14, the shape of the first opening 140 can be square or rectangular, and the long side of the rectangle is parallel to the long side direction of the display component DP. Using a rectangular first opening 140 can maximize space utilization and facilitate manufacturing. The dimensions of the rectangular first opening 140 are, for example, 10mm * 2.5mm.

[0122] In some examples, as shown in Figures 18, 20, 22 or 27, the channel wall of the air duct FD includes an air duct 160, at least a portion of which is disposed outside the sealed chamber.

[0123] For example, as shown in Figures 18, 20, 22 or 27, the air duct 160 is connected to the arc-shaped area of ​​the arc-shaped corner 130.

[0124] For example, as shown in Figures 18, 20, 22, or 27, the internal circulation fan 1400 includes a first air vent 1420. The housing 100 includes: an arc-shaped corner 130, which is disposed opposite to the first air vent 1420 along a first direction f1 on both sides of the illumination cavity 120; and an imaging housing 103, located on the periphery of the imaging cavity 110, connected to the end of the arc-shaped corner 130 near the imaging cavity 110. The first opening of the air duct 160 is connected to the arc-shaped area of ​​the arc-shaped corner 130, and the second opening passes through the imaging housing 103 and extends into the imaging cavity 110.

[0125] The imaging housing 103 is part of the housing 100 and is located on the periphery of the imaging cavity 110.

[0126] For example, as shown in Figure 23, half of the air duct 160 is provided on the left shell 101 and half on the right shell 102. The air duct 160 provided on the left shell 101 is called the left shell air duct 161, and the air duct 160 provided on the right shell 102 is called the right shell air duct 162. The left shell air duct 161 is integrally formed with the left shell 101, and the right shell air duct 162 is integrally formed with the right shell 102. After the left shell 101 and the right shell 102 are assembled, the left shell air duct 161 and the right shell air duct 162 are spliced ​​together to form a complete air duct 160.

[0127] For example, the air duct 160 is a thin-walled hollow structure. The second opening of the air duct 160 extending to the imaging cavity 110 is a flat opening, and the dimension of the flat opening along the second direction f2 is greater than or equal to twice the dimension of the flat opening along the first direction f1, and the second direction f2 is perpendicular to the first direction f1.

[0128] For example, as shown in Figures 18 to 21, the channel wall of the air guide channel FD further includes: a first air guide groove FC1, which is disposed in the imaging cavity 110. The groove opening of the first air guide groove FC1 is connected to the second pipe opening of the air guide pipe 160. The first air guide groove FC1 is located on the side of the air guide pipe 160 near the lens assembly 200, and the bottom of the first air guide groove FC1 extends into the gap between the lens assembly 200 and the imaging housing 103. A plurality of second openings 153 are provided on the groove wall of the first air guide groove FC1 facing the imaging cavity 110. The second openings 153 are used to connect the imaging cavity 110 and the air guide channel FD composed of the air guide pipe 160 and the first air guide groove FC1.

[0129] The first opening of the air duct 160 forms the air inlet of the air guide channel FD, and the second opening 153 of the first air guide groove FC1 forms the air outlet of the air guide channel FD. Because the first air guide groove FC1 is closer to the lens assembly, it helps to increase the airflow near the lens, allowing the water mist to dissipate quickly.

[0130] For example, as shown in FIG19, the connection angle 154 between the first air guide groove FC1 facing the imaging cavity 110 and the air guide duct 160 is chamfered. This can reduce wind resistance and help guide the air volume and blow it towards the lens position.

[0131] The chamfer can be a bevel or a rounded corner. When the connecting corner 154 between the first air guide FC1 facing the imaging cavity 110 and the air guide 160 is rounded, the wind resistance can be further reduced.

[0132] For example, as shown in FIG19, the second opening 156 of the air duct 160 is offset relative to the first opening 155 towards the side closer to the lens assembly 200. That is, in the first direction f1, the distance between the first opening 155 and the lens assembly 200 is greater than the distance between the second opening 156 and the lens assembly 200.

[0133] For example, as shown in Figure 19 or Figure 21, taking the left shell air duct 161 as an example, the dimension in the direction from the first opening 155 to the second opening 156 is 40mm, and the dimension in the first direction f1 is 20mm. The first opening 155 of the air duct 160 is rectangular with a cross-section of 20mm*5mm.

[0134] For example, as shown in FIG19, the second opening 153 is circular in shape, with a diameter of, for example, 2 mm. The air pressure blowing towards the lens can be increased by densely arranging small circular holes on the groove wall of the first air guide FC1 facing the imaging cavity 110. Multiple second openings 153 are arranged in an array on the groove wall of the first air guide FC1 facing the imaging cavity 110.

[0135] For example, as shown in Figure 19, the first air guide slot FC1 is provided in half on both the left shell 101 and the right shell 102. The first air guide slot FC1 provided on the left shell 101 is called the left shell first air guide slot FC11, and the first air guide slot FC1 provided on the right shell 102 is called the right shell first air guide slot FC12. The left shell first air guide slot FC11 is integrally formed with the left shell 101, and the right shell first air guide slot FC12 is integrally formed with the right shell 102. After the left shell 101 and the right shell 102 are assembled, the left shell first air guide slot FC11 and the right shell first air guide slot FC12 are joined together to form a complete first air guide slot FC1.

[0136] For example, as shown in FIG23, in the first direction f1, the distances between the first port 155 and the second port 156 of the air duct 160 and the lens assembly 200 are approximately equal. That is, in the first direction f1, the distance between the first port 155 and the lens assembly 200 is approximately equal to the distance between the second port 156 and the lens assembly 200.

[0137] For example, as shown in Figure 19 or Figure 23, the first port 155 of the air duct 160 constitutes the air inlet of the air duct FD, and the second port 156 constitutes the air outlet of the air duct FD.

[0138] For example, as shown in Figures 22 to 27, the projection optical engine further includes: a fixing plate 211 and a second air guide trough 1600, both disposed within the imaging cavity 110. The fixing plate 211 is located on the side of the second air guide trough 1600 away from the lens assembly 200. The fixing plate 211 is in contact with the opening of the second air guide trough 1600 and is used to seal the opening of the second air guide trough 1600. A third opening 1620 is provided on the wall of the second air guide trough 1600 facing the air guide duct 160. The third opening 1620 is connected to the second opening of the air guide duct 160. The bottom of the second air guide trough 1600 is opposite to and separated from the lens assembly 200 along the first direction f1. A plurality of air holes 1610 are provided on the bottom of the second air guide trough 1600. The air holes 1610 are used to connect the imaging cavity 110 and the air duct formed by the second air guide trough 1600 and the fixing plate 211.

[0139] For example, as shown in FIG24, the fixing plate 211 is disposed on the inner wall of the imaging housing 103 and is an integral structure with the imaging housing 103. The connection between the second air guide groove 1600 and the fixing plate 211 is a detachable connection. The detachable connection is, for example, a snap-fit ​​connection or a screw connection.

[0140] For example, as shown in FIG24, the air duct 160 and the fixing plate 211 are both integral with the housing 100, and the second air guide channel 1600 can be set independently of the housing 100. After the second air guide channel 1600 is assembled with the housing 100, it is fixed in the imaging cavity 110. After the air duct 160 is connected to the second air guide channel 1600, the air is blown out evenly through the multiple air holes 1610 of the second air guide channel 1600.

[0141] For example, as shown in Figures 24 to 26, the second air guide slot 1600 includes multiple air holes 1610, an air inlet 1620, a snap fastener 1630, and an inner air duct 1640. The air guide duct 160 is connected to the air inlet, i.e., the third opening 1620, of the second air guide slot 1600, and enters the inner air duct 1640. The inner air duct 1640 and the fixing plate 211 on the housing 100 form an interconnected air duct, and the airflow is blown out from the air holes 1610. The snap fastener 1630 of the second air guide slot 1600 passes through the slot 170 on the fixing plate 211 and is assembled and fixed to the fixing plate 211.

[0142] For example, as shown in Figures 24 to 26, the second air guide groove 1600 is an annular groove, and a plurality of air holes 1610 are arranged circumferentially along the annular groove. The plurality of air holes 1610 are rotationally symmetrical with respect to the normal direction fn of the lens assembly 200. This is beneficial for the second air guide groove 1600 to discharge air evenly and improve the temperature uniformity of the lens assembly 200.

[0143] For example, as shown in Figures 24 to 26, the vents 1610 are arranged around the lens assembly 200. The multiple vents 1610 can be evenly distributed or equally spaced along the circumferential direction of the annular groove. This is beneficial for the second air guide groove 1600 to discharge air evenly and improve the temperature uniformity of the lens assembly 200.

[0144] For example, as shown in FIG23, the dimension of the air duct 160 in the direction from the first duct opening 155 to the second duct opening 156 is 20mm, the dimension in the first direction f1 is 1.5mm, and the dimension in the second direction f2 is 10mm.

[0145] For example, as shown in Figure 23, the first opening 155 and the second opening 156 of the air duct 160 have the same shape and area. For example, the cross-section of the first opening 155 and the second opening 156 is a rectangle of 10mm*1.5mm.

[0146] To improve structural stability, the area of ​​the second opening 156 of the air duct 160 is smaller than the area of ​​the third opening 1620 of the second air guide groove 1600. This avoids the phenomenon of reduced structural strength, low production yield and easy air leakage caused by an excessively large air outlet area of ​​the air duct 160, and avoids turbulence near the air outlet 163, further improving the defogging effect.

[0147] For example, as shown in FIG25, the bottom of the second air guide groove 1600 includes a proximal end 251 near the third opening 1620, a distal end 252 away from the third opening 1620, and an intermediate section 253 located between the proximal end 251 and the distal end 252. The spacing of the air holes 1610 disposed in the proximal end 251 and / or the spacing of the air holes 1610 disposed in the distal end 252 is less than or equal to the spacing of the air holes 1610 disposed in the intermediate section 253.

[0148] By densely arranging the vents 1610 at the near end 251, the air pressure blowing towards the lens can be increased, thereby increasing the airflow within the imaging cavity 110. Similarly, densely arranging the vents 1610 at the far end 252 helps improve the temperature uniformity of the lens assembly 200.

[0149] For example, as shown in FIG24, the air duct 160 includes: a first sub-air duct 241, a connecting part 242 and a second sub-air duct 243 connected in sequence. The first sub-air duct 241 is also connected to the arc-shaped corner 130, and the second sub-air duct 243 is also connected to the second air duct 1600. The diameter of the second sub-air duct 243 is smaller than the diameter of the first sub-air duct 241. A stepped structure is formed at the position where the first sub-air duct 241, the connecting part 242 and the second sub-air duct 243 are connected.

[0150] In this configuration, the end of the second sub-guide duct 243 near the second guide groove 1600 passes through the third opening 1620. The inner surface of the wall of the third opening 1620 is in contact with the outer surface of the wall of the second sub-guide duct 243. The surface of the second guide groove 1600 facing the first sub-guide duct 241 is in contact with the connecting part 242. Thus, the connecting part 242 serves as a barrier and a seal.

[0151] For example, the first sub-air guide duct 241, the connecting part 242 and the second sub-air guide duct 243 are an integral structure.

[0152] For example, as shown in FIG13, the projection optical engine further includes: a return air channel FH, which is disposed at the junction of the illumination cavity 120 and the imaging cavity 110. The air inlet of the return air channel FH faces the imaging cavity 110, and the air outlet of the return air channel FH faces the illumination cavity 120. The return air channel FH is used to guide the airflow in the imaging cavity 110 back to the illumination cavity 120. The return air channel FH and the air guide channel FD are disposed opposite to each other on both sides of the sealed chamber along the first direction f1. The return air channel FH is located on the side of the internal circulation fan 1400 near the imaging cavity 110.

[0153] For example, as shown in Figures 13 to 15, the projection optical engine further includes a display component DP, which includes a display panel 500 and a frame 600. The frame 600 is disposed around the display panel 500 and is used to fix the display panel 500.

[0154] To allow airflow through the gap between the display panel 500 and the imaging lens 400, as shown in Figure 15, the frame 600 can be designed as a two-layer integrated structure, with multiple reinforcing ribs 620 connecting the two layers to ensure structural strength. During assembly, the display panel 500 and the imaging lens 400 are first fixed to the lower and upper surfaces of the frame 600 respectively, secured by clips. Then, the frame 600 is assembled into the housing 100 via a slide rail on the side wall of the housing 100. The slide rail and the frame 600 are positioned and guided by a flange 640.

[0155] For example, the channel wall of the return air duct FH is set independently of the housing 100, for example, set on the frame 600.

[0156] For example, as shown in Figures 13 to 15, a plurality of fourth openings 610 are provided on the frame 600 on the side of the display panel 500 away from the arc corner 130. The fourth openings 610 penetrate the frame 600 in the direction from the imaging cavity 110 to the illumination cavity 120. The plurality of fourth openings 610 are arranged sequentially along the long side of the display component DP. The plurality of fourth openings 610 constitute the return air channel FH, and the frame 600 constitutes the channel wall of the return air channel FH.

[0157] The fourth opening 610, with its opening facing the imaging cavity 110, forms the air inlet of the return air channel FH, and the opening facing the illumination cavity 120 forms the air outlet of the return air channel FH.

[0158] As shown in Figures 13 to 15, the fourth opening 610 is symmetrically arranged with the first opening 140, and their shapes, sizes, and quantities are identical. By aligning the air guide channel FD with the return air channel FH, smooth airflow in and out can be ensured, which is beneficial to the internal circulation efficiency of the optical engine and shortens the defogging time.

[0159] For example, as shown in FIG13, the internal circulation fan 1400 further includes a second air vent 1450 located on the side of the internal circulation fan 1400 opposite to the first air vent 1420.

[0160] For example, as shown in FIG13, when the projection optical engine is also provided with a return air channel FH, the first air outlet 1420 is the air outlet of the internal circulation fan 1400, and the second air outlet 1450 is the return air outlet of the internal circulation fan 1400.

[0161] For example, as shown in Figure 20 or Figure 27, when the return air channel FH is not provided in the sealed chamber, the first air outlet 1420 is the return air outlet of the internal circulation fan 1400, the second air outlet 1450 is the air outlet of the internal circulation fan 1400, and the return air channel FH is used to guide the airflow in the imaging cavity 110 back to the illumination cavity 120.

[0162] In some examples, as shown in Figures 16 and 17, the channel wall of the air duct FD is set independently of the housing 100, for example, on the frame 600 of the display component DP.

[0163] For example, as shown in Figures 15 to 17, the projection optical engine further includes: an internal circulation fan 1400; and a display component DP, including a display panel 500 and a frame 600. The frame 600 is disposed on the periphery of the display panel 500 for fixing the display panel 500. A plurality of fourth openings 610 are provided on the frame 600 located on the side of the display panel 500 near the internal circulation fan 1400. The fourth openings 610 penetrate the frame 600 in the direction from the imaging cavity 110 to the illumination cavity 120. The plurality of fourth openings 610 are arranged sequentially along the long side of the display component DP. The plurality of fourth openings 610 constitute an air guide channel FD, and the frame 600 constitutes the channel wall of the air guide channel FD.

[0164] Among them, the opening of the fourth opening 610 facing the imaging cavity 110 constitutes the air outlet of the air guide channel FD, and the opening facing the illumination cavity 120 constitutes the air inlet of the air guide channel FD.

[0165] For example, as shown in FIG16, the internal circulation fan 1400 includes: a first air vent 1420, which is located near the display component DP; and a second air vent 1450, which is located on the side of the internal circulation fan 1400 away from the first air vent 1420.

[0166] For example, when the fourth opening 610 forms an air guide channel FD, the first air outlet 1420 is the return air outlet of the internal circulation fan 1400, and the second air outlet 1450 is the air outlet of the internal circulation fan 1400.

[0167] For example, the ratio of the inlet area to the outlet area of ​​the air guide duct FD is greater than or equal to 1 and less than or equal to 1.2. By setting the inlet area of ​​the air guide duct FD to be slightly larger than the total outlet area, the pressure difference between the inlet and outlet is maintained, preventing air backflow from forming turbulent airflow that affects circulation.

[0168] For example, the lens assembly 200 includes a lens with a hydrophobic film on its surface, the hydrophobic film being used to make the lens exhibit hydrophobicity.

[0169] As shown in Figure 29, by applying a waterproof film coating to the two lenses on the inner and outer surfaces of the lens assembly 200, the threshold of humidity influence can be increased, that is, the probability of water mist generation can be reduced, and the defogging time can also be shortened.

[0170] For example, a hydrophobic film can be coated on the lens surface, making the glass surface hydrophobic and significantly reducing the likelihood of water vapor formation due to changes in ambient humidity. Under this effect, water molecules in the air are less likely to condense into water vapor on the lens surface. The waterproof film not only reduces the formation of water droplets but also helps to quickly eliminate existing water droplets, thereby restoring a clear field of vision in a short time and improving the user experience.

[0171] For example, a self-adhesive label is provided on the inner wall of the housing 100, and the main component of the self-adhesive label is resin.

[0172] By applying adhesive to the inner wall of the housing 100, dust and foreign objects in the air can be effectively captured and fixed, adhering to the adhesive and preventing these particles from accumulating on the display screen, thus affecting image quality and the long-term lifespan of the device. By reducing the deposition of dust and other foreign objects on the display screen, image clarity and color accuracy are ensured, providing users with a cleaner and more realistic visual experience.

[0173] Referring to FIG28, an exemplary schematic diagram of the adhesive label location is shown. Taking the left shell 101 as an example, the specific locations of the adhesive label include the side wall 190 of the imaging cavity 110 of the shell 100, the arc-shaped corner 130, the internal fan circulation position 180, etc.

[0174] For example, the main components of liquid self-adhesive adhesives include resin, additives, fillers, and solvents. The resin, as the main component, provides adhesive strength; additives are used to adjust the viscosity and bonding properties of the adhesive; fillers are used to enhance the mechanical stability of the adhesive and reduce costs; and solvents are used to adjust the viscosity and drying speed of the adhesive.

[0175] The following examples illustrate this solution.

[0176] In the first example, as shown in Figure 13, the projection optical engine includes an air guide channel FD and a return air channel FH. The air guide channel FD is formed by a first opening 140, and the return air channel FH is formed by a fourth opening 610 on the frame. In this example, the internal circulation fan 1400 rotates counterclockwise. The airflow from the internal circulation fan 1400 is blown out from the first air outlet 1420, passes over the upper surface of the heat insulation glass 700 and the lower surface of the display panel 500. At the arc corner 130, most of the airflow is reversed, flows through the lower surface of the frame 600, the imaging lens 400 and the upper surface of the display panel 500, and then flows back to the internal circulation fan 1400 from the gap between the cavity heat sink 1300 and the internal circulation fan 1400. Air is then drawn in through the second air outlet 1450 to complete the internal circulation. Another part of the airflow is guided to the vicinity of the lens through the first opening 140 of the housing 100, circulates near the imaging cavity 110, and then flows downward through the fourth opening 610, merging with the main airflow and flowing back to the internal circulation fan 1400.

[0177] In the second example, as shown in Figure 16, the projection engine includes an air duct FD, but no return air duct FH is provided in the sealed chamber. The air duct FD is formed by the fourth opening 610 on the frame. In this example, the internal circulation fan 1400 rotates clockwise, and the airflow of the internal circulation fan 1400 blows out from the second air outlet 1450. Most of the airflow flows through the frame 600, the lower surface of the imaging lens 400, and the upper surface of the display panel 500, then turns back at the arc corner 130, flows through the upper surface of the heat insulation glass 700 and the lower surface of the display panel 500, and returns to the first air outlet 1420, completing the internal circulation. Another part of the airflow flows through the fourth opening 610 and the imaging mirror 300 to the vicinity of the lens assembly 200, circulates inside the imaging cavity 110, passes through the upper surface of the imaging lens 400, and then flows through the imaging mirror 300 and the lens assembly 200 again, that is, it self-circulates inside the imaging cavity 110.

[0178] In this example, since no return air channel is provided at the arc corner 130, more airflow from the internal circulation fan 1400 can pass over the upper surface of the display panel 500. Combined with the clockwise rotation of the internal circulation fan 1400, the airflow and velocity on the upper surface of the display panel 500 can be increased, which helps to reduce the temperature of the upper surface of the display panel 500.

[0179] In the third example, as shown in Figure 18, the projection optical engine includes an air guide channel FD and a return air channel FH. The air guide channel FD is composed of an air guide pipe 160 and a first air guide groove FC1, and the return air channel FH is composed of a fourth opening 610 on the frame. In this example, the internal circulation fan 1400 rotates counterclockwise. The airflow from the internal circulation fan 1400 is blown out from the first air outlet 1420, passes through the upper surface of the heat insulation glass 700 and the lower surface of the display panel 500. At the arc corner 130, most of the airflow is reversed, flows through the lower surface of the frame 600, the imaging lens 400 and the upper surface of the display panel 500, and then flows back to the internal circulation fan 1400 from the gap between the cavity heat sink 1300 and the internal circulation fan 1400. The airflow is then drawn in through the second air outlet 1450 to complete the internal circulation. Another part of the airflow passes through the air duct 160 and the first air duct FC1, is blown out from the second opening 153 and guided to the vicinity of the lens assembly 200. After circulating inside the imaging cavity 110, it flows downward through the fourth opening 610, merges with the main airflow and flows back to the internal circulation fan 1400.

[0180] In the fourth example, as shown in Figure 20, the projection optical engine includes an air guide channel FD, but no return air channel FH is provided in the sealed chamber. The air guide channel FD is composed of an air guide pipe 160 and a first air guide groove FC1. In this example, the internal circulation fan 1400 rotates clockwise, and the airflow of the internal circulation fan 1400 blows out from the second air outlet 1450. Most of the airflow flows through the lower surface of the frame 600, the imaging lens 400, and the upper surface of the display panel 500, then turns back at the arc corner 130, flows through the upper surface of the heat insulation glass 700 and the lower surface of the display panel 500, and returns to the first air outlet 1420, completing the internal circulation. Another part of the airflow passes through the air duct 160 and the first air duct FC1, and is blown to the imaging cavity 110 through the second opening 153. It flows to the vicinity of the lens assembly 200, circulates inside the imaging cavity 110, passes through the upper surface of the imaging lens 400, and then flows through the imaging mirror 300 and the lens assembly 200 again, that is, it self-circulates inside the imaging cavity 110.

[0181] In this example, since no return air duct FH is set in the sealed chamber, more airflow from the internal circulation fan 1400 can pass through the upper surface of the display panel 500. Combined with the clockwise rotation of the internal circulation fan 1400, the airflow and velocity on the upper surface of the display panel 500 can be increased, which helps to reduce the temperature of the upper surface of the display panel 500.

[0182] In the fifth example, as shown in Figure 22, the projection optical engine includes an air guide channel FD and a return air channel FH. The air guide channel FD is composed of an air guide pipe 160, and the return air channel FH is composed of a fourth opening 610 on the frame. In this example, the internal circulation fan 1400 rotates counterclockwise. The airflow from the internal circulation fan 1400 is blown out from the first air outlet 1420, passes through the upper surface of the heat insulation glass 700 and the lower surface of the display panel 500. At the arc corner 130, most of the airflow is reversed, flows through the lower surface of the frame 600, the imaging lens 400 and the upper surface of the display panel 500, and then flows back to the internal circulation fan 1400 from the gap between the cavity heat sink 1300 and the internal circulation fan 1400. The airflow is then drawn in through the second air outlet 1450 to complete the internal circulation. Another part of the airflow passes through the air duct 160 and the second air duct 1600 in sequence, blown from the air hole 1610 to the lens assembly 200, circulates inside the imaging cavity 110, and then flows downward through the fourth opening 610, merging with the main airflow and flowing back to the internal circulation fan 1400.

[0183] In the sixth example, as shown in Figure 27, the projection engine includes an air duct FD, but no return air duct FH is provided in the sealed chamber. The air duct FD is composed of an air duct 160. In this example, the internal circulation fan 1400 rotates clockwise, and the airflow of the internal circulation fan 1400 blows out from the second air outlet 1450. Most of the airflow flows through the lower surface of the frame 600, the imaging lens 400, and the upper surface of the display panel 500, then turns back at the arc corner 130, flows through the upper surface of the heat insulation glass 700 and the lower surface of the display panel 500, and returns to the first air outlet 1420, completing the internal circulation. Another part of the airflow passes through the air duct 160 and the second air duct 1600, blows from the air hole 1610 to the lens assembly 200, circulates inside the imaging cavity 110, passes through the upper surface of the imaging lens 400, and then flows again through the imaging mirror 300 and the lens assembly 200, that is, it self-circulates inside the imaging cavity 110.

[0184] This disclosure also provides a projection optical engine, as shown in Figures 13 to 27. The projection optical engine includes: a housing 100, a lens assembly 200, an internal circulation fan 1400, and an air guide channel FD. The housing 100 is used to form a sealed chamber, which includes an illumination chamber 120 and an imaging chamber 110. The lens assembly 200 is disposed in the imaging chamber 110, and the internal circulation fan 1400 is disposed in the illumination chamber 120.

[0185] The air guide channel FD is located at the junction of the illumination cavity 120 and the imaging cavity 110. The air inlet of the air guide channel FD faces the illumination cavity 120, and the air outlet of the air guide channel FD faces the imaging cavity 110. The air guide channel FD is used to guide the airflow blown by the internal circulation fan 1400 into the imaging cavity 110. Furthermore, the internal circulation fan 1400 includes a first air outlet 1420, and the housing 100 includes an arc-shaped corner 130. The arc-shaped corner 130 and the first air outlet 1420 are arranged opposite each other on both sides of the illumination cavity 120 along a first direction f1. The channel wall of the air guide channel FD is connected to and located close to the arc-shaped corner 130. The first direction f1 is approximately parallel to the normal direction fn of the lens assembly.

[0186] For example, the arcuate corner 130 is located on the same side of the sealed chamber as the lens assembly 200.

[0187] The specific implementation of the projection optical engine provided in this disclosure can be referred to the above description of Figures 1 to 27, and will not be repeated here.

[0188] This disclosure also provides a projection optical engine, as shown in Figures 18 to 27, which includes: a housing 100, a lens assembly 200, an internal circulation fan 1400, and an air guide channel FD. The housing 100 is used to form a sealed chamber, which includes an illumination chamber 120 and an imaging chamber 110. The lens assembly 200 is disposed in the imaging chamber 110, and the internal circulation fan 1400 is disposed in the illumination chamber 120.

[0189] The air guide channel FD is located at the junction of the illumination cavity 120 and the imaging cavity 110. The air inlet of the air guide channel FD faces the illumination cavity 120, and the air outlet of the air guide channel FD faces the imaging cavity 110. The air guide channel FD is used to guide the airflow blown by the internal circulation fan 1400 into the imaging cavity 110. Furthermore, the channel wall of the air guide channel FD includes an air guide pipe 160, at least a portion of which is located outside the sealed chamber.

[0190] The specific implementation of the projection optical engine provided in this disclosure can be referred to the above description of Figures 1 to 27, and will not be repeated here.

[0191] This disclosure provides a projection apparatus that includes a projection optical engine as provided in any embodiment. For example, the projection apparatus is a projector.

[0192] In this disclosure, "multiple" means two or more, and "at least one" means one or more, unless otherwise expressly and specifically defined.

[0193] In this disclosure, the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this disclosure.

[0194] In this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0195] The terms "an embodiment," "some embodiments," "exemplary embodiments," "one or more embodiments," "example," "one example," "some examples," etc., used herein are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be included in any suitable manner in any one or more embodiments or examples.

[0196] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0197] In describing some embodiments, the terms "coupled" and "connected" may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. Similarly, the term "coupled" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the terms "coupled" or "communicatively coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content of this document.

[0198] "At least one of A, B and C" has the same meaning as "at least one of A, B or C", both including the following combinations of A, B and C: only A, only B, only C, combinations of A and B, combinations of A and C, combinations of B and C, and combinations of A, B and C.

[0199] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0200] As used herein, depending on the context, the term “if” may optionally be interpreted as meaning “when”, “in the event of”, “in response to determination”, or “in response to detection”. Similarly, depending on the context, the phrase “if it is determined that…” or “if [the stated condition or event] is detected” may optionally be interpreted as meaning “in the event of determination that…”, “in response to determination that…”, “when [the stated condition or event] is detected”, or “in response to the detection of [the stated condition or event]”.

[0201] The use of “for” or “configured to” in this article implies an open and inclusive language that does not preclude the applicability to or configuration of devices to perform additional tasks or steps.

[0202] The use of "based on" or "according to" in this document implies openness and inclusiveness. A process, step, calculation, or other action based on one or more of the stated conditions or values ​​may, in practice, be based on other conditions or values ​​beyond those stated.

[0203] As used herein, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from the given value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the given quantity (i.e., the limitations of the measurement system).

[0204] As used herein, “parallel,” “perpendicular,” “equal,” and “flush” include the described situation and situations that are similar to the described situation, within an acceptable range of deviation, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, “parallel” includes absolute parallelism and approximate parallelism, where the acceptable range of deviation for approximate parallelism can be, for example, within 5°; “perpendicular” includes absolute perpendicularity and approximate perpendicularity, where the acceptable range of deviation for approximate perpendicularity can also be, for example, within 5°. “Equal” includes absolute equality and approximate equality, where the acceptable range of deviation for approximate equality can be, for example, the difference between the two equals being less than or equal to 5% of either one. “Flush” includes absolute flush and approximate flush, where the acceptable range of deviation for approximate flush can be, for example, the distance between the flush twos being less than or equal to 5% of either one of the dimensions.

[0205] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.

[0206] This document describes exemplary examples with reference to sectional views and / or plan views as idealized exemplary drawings. In the drawings, the thickness of layers and regions is enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, the exemplary examples should not be construed as limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. For example, etched areas shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the areas of the device, nor are they intended to limit the scope of the exemplary examples.

[0207] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A projection optical engine, comprising: The enclosure comprises a housing, a lens assembly, an internal circulation fan, and an air guide channel. The housing forms a sealed chamber, which includes an illumination chamber and an imaging chamber. The lens assembly is disposed within the imaging chamber, and the internal circulation fan is disposed within the illumination chamber. The air guide channel is located at the junction of the illumination cavity and the imaging cavity. The air inlet of the air guide channel faces the illumination cavity, and the air outlet of the air guide channel faces the imaging cavity. The air guide channel is used to guide the airflow blown out by the internal circulation fan into the imaging cavity. Wherein, the angle between the air outlet direction of the air guide channel and the normal direction of the lens assembly is less than or equal to 90°, and the normal direction of the lens assembly is away from the lens assembly.

2. The projection optical engine according to claim 1, wherein, The internal circulation fan includes a first air outlet, the housing includes an arc-shaped corner, the arc-shaped corner and the first air outlet are disposed on opposite sides of the illumination cavity along a first direction, the channel wall of the air guide channel is connected to the arc-shaped corner, and the first direction is approximately parallel to the normal direction of the lens assembly.

3. The projection optical engine according to claim 2, wherein, The projection optical engine also includes: The display component and the limiting part are both located in the sealed cavity. The limiting part is used to limit the position of the display component in the first direction. The limiting part is connected to the edge of the arc-shaped corner near the imaging cavity. The limiting part is provided with at least one first opening, which penetrates the limiting part in the direction from the illumination cavity to the imaging cavity. The at least one first opening constitutes the air guide channel, and the limiting part constitutes the channel wall of the air guide channel.

4. The projection optical engine according to claim 3, wherein, The limiting part includes: A first plate and a second plate, the first plate being connected between the second plate and the arc-shaped corner, the second plate and the arc-shaped corner being located on the side of the first plate closer to the lighting cavity, the surface of the second plate facing away from the arc-shaped corner abutting against the display component to define the position of the display component in the first direction, the first opening being disposed on the first plate, the first plate constituting the channel wall of the air guide channel.

5. The projection optical engine according to claim 3, wherein, The limiting part is provided with a plurality of first openings, and the plurality of first openings are arranged sequentially along the long side of the display component.

6. The projection optical engine according to claim 1, wherein, The channel wall of the air guide channel includes an air guide pipe, at least a portion of which is disposed outside the sealed chamber.

7. The projection optical engine according to claim 6, wherein, The internal circulation fan includes a first air outlet, and the housing includes: An arc-shaped corner, wherein the arc-shaped corner is disposed on both sides of the lighting cavity opposite to the first air vent along a first direction; and An imaging housing is located around the imaging cavity and is connected to the end of the arc-shaped corner near the imaging cavity. The first opening of the air duct is connected to the arc-shaped corner, and the second opening passes through the imaging housing and extends into the imaging cavity.

8. The projection optical engine according to claim 7, wherein, The channel wall of the air guide channel also includes: A first air guide groove is disposed inside the imaging cavity. The opening of the first air guide groove is connected to the second pipe opening. The first air guide groove is located on the side of the air guide pipe near the lens assembly, and the bottom of the first air guide groove extends into the gap between the lens assembly and the imaging housing. A plurality of second openings are provided on the groove wall of the first air guide groove facing the imaging cavity. The second openings are used to connect the imaging cavity and the air guide channel formed by the air guide pipe and the first air guide groove.

9. The projection optical engine according to claim 8, wherein, The corner connecting the first air guide groove to the imaging cavity and the air guide pipe is chamfered.

10. The projection optical engine according to claim 8, wherein, The second nozzle is offset relative to the first nozzle towards the side closer to the lens assembly.

11. The projection optical engine according to claim 7, wherein, In the first direction, the distances between the first opening and the second opening and the lens assembly are approximately equal.

12. The projection optical engine according to claim 11, wherein, The projection optical engine also includes: A fixing plate and a second air guide channel are both disposed within the imaging cavity. The fixing plate is located on the side of the second air guide channel facing away from the lens assembly. The fixing plate is in contact with the opening of the second air guide channel to seal the opening. A third opening is provided on the channel wall of the second air guide channel facing the air guide tube, and the third opening is connected to the second tube opening. The bottom of the second air guide channel is opposite to and separated from the lens assembly. Multiple air holes are provided on the bottom of the groove, which are used to connect the imaging cavity and the air duct formed by the second air guide groove and the fixed plate.

13. The projection optical engine according to claim 12, wherein, The second air guide groove is an annular groove, and the plurality of air holes are arranged circumferentially along the annular groove. The plurality of air holes are rotationally symmetrical with respect to the normal direction of the lens assembly.

14. The projection optical engine according to claim 13, wherein, The bottom of the second air guide groove includes a proximal end near the third opening, a distal end away from the third opening, and an intermediate section located between the proximal end and the distal end. The spacing between the air holes at the proximal end and / or at the distal end is less than or equal to the spacing between the air holes at the intermediate section.

15. The projection optical engine according to claim 12, wherein, The air duct includes: A first sub-air guide pipe, a connecting part, and a second sub-air guide pipe are connected in sequence. The first sub-air guide pipe is also connected to the arc-shaped corner, and the second sub-air guide pipe is also connected to the second air guide groove. The diameter of the second sub-air guide pipe is smaller than the diameter of the first sub-air guide pipe. A stepped structure is formed at the position where the first sub-air guide pipe, the connecting part, and the second sub-air guide pipe are connected. The second sub-air guide pipe has one end near the second air guide groove inserted into the third opening. The inner surface of the third opening wall is in contact with the outer surface of the second sub-air guide pipe wall. The surface of the second air guide groove facing the first sub-air guide pipe is in contact with the connecting part.

16. The projection optical engine according to claim 12, wherein, The fixing plate is disposed on the inner wall of the imaging housing and is an integral structure with the imaging housing. The connection between the second air guide groove and the fixing plate is detachable.

17. The projection optical engine according to claim 7, wherein, The second opening is a flat opening, and the dimension of the flat opening along the second direction is greater than or equal to twice the dimension of the flat opening along the first direction, wherein the second direction is perpendicular to the first direction.

18. The projection optical engine according to claim 2, wherein, The channel wall of the air guide channel is an integral structure with the shell.

19. The projection optical engine according to any one of claims 2 to 18, wherein, The projection optical engine also includes: A return air duct is located at the junction of the illumination cavity and the imaging cavity. The air inlet of the return air duct faces the imaging cavity, and the air outlet faces the illumination cavity. The return air duct is used to guide the airflow from the imaging cavity back to the illumination cavity. The air guide channels are arranged opposite each other on both sides of the sealed chamber along the first direction, and the return air channel is located on the side of the internal circulation fan closer to the imaging cavity.

20. The projection optical engine according to claim 19, wherein, The projection optical engine also includes: The display assembly includes a display panel and a frame. The frame is disposed around the display panel and is used to fix the display panel. A plurality of fourth openings are provided on the frame on the side of the display panel away from the arc corner. The fourth openings penetrate the frame along the direction from the imaging cavity to the illumination cavity. The plurality of fourth openings are arranged sequentially along the long side of the display assembly. The plurality of fourth openings constitute the return air channel, and the frame constitutes the channel wall of the return air channel.

21. The projection optical engine according to claim 19, wherein, The internal circulation fan also includes: The second air vent is located on the side of the internal circulation fan away from the first air vent. The first air vent is the air outlet of the internal circulation fan, and the second air vent is the air return vent of the internal circulation fan.

22. The projection optical engine according to any one of claims 2 to 18, wherein, The internal circulation fan also includes: The second air vent is located on the side of the internal circulation fan away from the first air vent. In the case that no return air channel is provided in the sealed cavity, the first air vent is the return air vent of the internal circulation fan, and the second air vent is the air outlet of the internal circulation fan. The return air channel is used to guide the airflow in the imaging cavity back to the illumination cavity.

23. The projection optical engine according to claim 1, wherein, The projection optical engine also includes: Internal circulation fan; and The display assembly includes a display panel and a frame. The frame is disposed around the display panel and is used to fix the display panel. A plurality of fourth openings are provided on the frame on the side of the display panel near the internal circulation fan. The fourth openings penetrate the frame along the direction from the imaging cavity to the illumination cavity. The plurality of fourth openings are arranged sequentially along the long side of the display assembly and form the air guide channel. The frame forms the channel wall of the air guide channel.

24. The projection optical engine according to claim 23, wherein, The internal circulation fan includes: The first air vent is positioned close to the display component; and The second air vent is located on the side of the internal circulation fan away from the first air vent. The first air vent is the return air vent of the internal circulation fan, and the second air vent is the air outlet of the internal circulation fan.

25. The projection optical engine according to any one of claims 1 to 24, wherein, The ratio of the air inlet area to the air outlet area of ​​the air guide channel is greater than or equal to 1 and less than or equal to 1.

2.

26. The projection optical engine according to any one of claims 1 to 25, wherein, The lens assembly includes a lens with a hydrophobic film on its surface, the hydrophobic film being used to make the lens exhibit hydrophobicity.

27. The projection optical engine according to any one of claims 1 to 26, wherein, The inner wall of the housing is provided with self-adhesive, and the main component of the self-adhesive is resin.

28. A projection optical engine, comprising: The enclosure comprises a housing, a lens assembly, an internal circulation fan, and an air guide channel. The housing forms a sealed chamber, which includes an illumination chamber and an imaging chamber. The lens assembly is disposed within the imaging chamber, and the internal circulation fan is disposed within the illumination chamber. The air guide channel is located at the junction of the illumination cavity and the imaging cavity. The air inlet of the air guide channel faces the illumination cavity, and the air outlet of the air guide channel faces the imaging cavity. The air guide channel is used to guide the airflow blown out by the internal circulation fan into the imaging cavity. The internal circulation fan includes a first air outlet, the housing includes an arc-shaped corner, the arc-shaped corner and the first air outlet are disposed opposite to each other on both sides of the illumination cavity along a first direction, the channel wall of the air guide channel is connected to the arc-shaped corner and disposed close to the arc-shaped corner, and the first direction is approximately parallel to the normal direction of the lens assembly.

29. A projection optical engine, comprising: The enclosure comprises a housing, a lens assembly, an internal circulation fan, and an air guide channel. The housing forms a sealed chamber, which includes an illumination chamber and an imaging chamber. The lens assembly is disposed within the imaging chamber, and the internal circulation fan is disposed within the illumination chamber. The air guide channel is located at the junction of the illumination cavity and the imaging cavity. The air inlet of the air guide channel faces the illumination cavity, and the air outlet of the air guide channel faces the imaging cavity. The air guide channel is used to guide the airflow blown out by the internal circulation fan into the imaging cavity. The air guide channel includes an air guide pipe in its channel wall, and at least a portion of the air guide pipe is disposed outside the sealed chamber.

30. A projection apparatus comprising a projection optical engine as described in any one of claims 1 to 29.

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