Projection device

Abstract

A projection device disclosed by the present invention comprises a support, a ray machine assembly and a water cooling system, the ray machine assembly comprises a light valve shell and a light valve, the light valve is installed in the light valve shell, and a water flow channel communicated with the water cooling system is arranged in the support. A first heat dissipation face is formed on the outer surface, corresponding to the position of the water flow channel, of the support, and the light valve shell is connected with the first heat dissipation face. According to the projection equipment provided by the invention, heat of the light valve shell can be quickly dissipated, and adverse effects on the light valve are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of projection equipment, and in particular to a projection equipment. Background Art

[0002] Projection equipment is widely popular in the consumer market due to its high brightness, portability, and intelligence. The core components of projection equipment include the projection optical engine. For DLP projectors, it is equipped with a DMD (Digital Micromirror Device). The surface of the DMD is covered with tiny rotatable lenses that reflect light by rotating. The rotation of each lens is controlled by an electronic circuit, which controls the brightness of each pixel in the projected image. The light beam emitted by the optical engine light source is irradiated onto the surface of the DMD after a series of optical path adjustments such as zooming and collimation. After being reflected by the lenses on the surface of the DMD, it forms a projection beam with image information. Finally, it is magnified by the projection lens and projected out.

[0003] However, with the increase in frame rate and brightness, the power consumption of the DMD and the heat generated by light exposure have been significantly affected. In particular, the corresponding dark state lens will reflect light onto the housing, causing the housing and its internal temperature to rise, which in turn affects the performance of the DMD. If the DMD temperature is too high, it can easily cause the component to operate slowly and malfunction, ultimately resulting in abnormal projection images. Therefore, in the face of ever-increasing projection screen brightness and higher-performance DMDs, how to effectively dissipate heat from the DMD has become an urgent problem that needs to be solved. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a projection device that can quickly dissipate heat from a light valve housing to avoid adverse effects on the light valve.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention discloses a projection device, including a bracket, an optical-mechanical assembly, and a water-cooling system. The optical-mechanical assembly includes a light valve housing and a light valve. The light valve is installed in the light valve housing. A water flow channel connected to the water cooling system is opened in the bracket. The outer surface of the bracket forms a first heat dissipation surface at a position corresponding to the water flow channel, and the light valve housing is connected to the first heat dissipation surface.

[0007] Preferably, the bracket includes a bracket body and a water-cooling plate, the water-cooling plate is detachably connected to the bracket body, the water flow channel is opened inside the water-cooling plate, and the first heat dissipation surface is located on the water-cooling plate.

[0008] Preferably, the water-cooling plate includes a first plate body and a second plate body that are detachably connected to each other, the first plate body and / or the second plate body are detachably connected to the bracket body, the water flow channel is formed between the first plate body and the second plate body, and the side of the second plate body away from the first plate body is provided with a water inlet pipe and a water outlet pipe connected to the water flow channel, and the water inlet pipe and the water outlet pipe are respectively connected to the water cooling system.

[0009] Preferably, one of the side of the first plate body close to the second plate body and the side of the second plate body close to the first plate body is recessed to form the water flow channel, and a plurality of guide columns arranged at intervals are protruded from the water flow channel, and when the first plate body and the second plate body are sealed to each other, the guide columns are abutted against the corresponding plate body that does not have the water flow channel.

[0010] Preferably, the water-cooling plate further includes a first seal and a second seal, wherein the first seal abuts against the outer edge of the water flow channel between the first plate body and the second plate body; the second seal abuts against between the guide column and the corresponding plate body without the water flow channel.

[0011] Preferably, the top surface of the light valve housing abuts against the first heat dissipation surface directly or through a heat-conducting buffer.

[0012] Preferably, the light valve includes a DMD, an area on the light valve housing for receiving invalid light reflected by the DMD is a heating area, and an outer surface of the light valve housing corresponding to the heating area is in contact with the first heat dissipation surface.

[0013] Preferably, the water cooling system includes a radiator, a heat conversion part, a water pipe, a water pump and a fan, the radiator, the water pump and the fan are respectively fixed on the bracket, the heat conversion part abuts against the optical machine component, the radiator, the heat conversion part, the water pump and the water flow channel are connected by the water pipe to form a circulation flow channel, and the air outlet side of the fan faces the radiator.

[0014] Preferably, the radiator, the heat conversion unit, and the water pump are all located on the same side of the water-cooling plate, and the water-cooling plate is provided with a water inlet pipe and a water outlet pipe connected to the water flow channel, and the water inlet pipe and the water outlet pipe are located on the side of the water-cooling plate close to the optical-mechanical assembly.

[0015] Preferably, the optical-mechanical assembly further comprises a light source and a projection lens, wherein the light source, the light valve and the projection lens are arranged in sequence along the light path, the light valve housing is provided with a light inlet and a light outlet, the light inlet is connected to one side of the light source, and the light outlet is connected to one side of the projection lens, the light source and the light valve are respectively abutted against the heat conversion part; a fixing column is protruded from the bracket, and the optical-mechanical assembly is fixed to the fixing column by fasteners.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the projection device proposed in the present invention introduces a water cooling system, a water flow channel connected to the flow channel in the water cooling system is opened in the bracket, and the light valve shell where the light valve is located is connected to the outer surface of the bracket at the corresponding water flow channel position, so that the heat on the light valve shell is transferred to the outer surface of the bracket at the corresponding water flow channel position, and then the heat is quickly taken away by the water-cooling liquid in the water flow channel, thereby achieving efficient heat dissipation of the light valve shell, overcoming the bottleneck problem of thermal management efficiency of high-load light valves, and avoiding adverse effects on the light valve.

[0017] In a further solution, the water flow channel of the present invention is opened on a water cooling plate detachably connected to the bracket body, and different water cooling plates can be replaced accordingly when suitable for optical components of different specifications, thereby reducing equipment costs.

[0018] Other beneficial effects of the embodiments of the present invention will be further described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the internal structure of a projection device according to a preferred embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the light path of the light valve in the light valve housing;

[0021] Figure 3 This is a schematic diagram of the water cooling plate;

[0022] Figure 4 This is a schematic diagram of the water cooling plate from another angle;

[0023] Figure 5 This is a structural diagram of the water cooling plate being disassembled from the bracket body;

[0024] Figure 6 This is a schematic diagram of the interior of the projection device from another angle;

[0025] Figure 7 It is a structural diagram of the bracket.

[0026] Description of Figure Numbers:

[0027] 10. Bracket; 11. Bracket body; 12. Water-cooling plate; 121. First plate body; 122. Second plate body; 123. First sealing member; 124. Second sealing member; 1221. Water inlet pipe; 1222. Water outlet pipe; 1223. Water inlet; 1224. Water outlet; 1225. Threaded hole; 13. Fixing column; 101. Water flow channel; 102. First heat dissipation surface; 103. Guide column;

[0028] 20. Optical-mechanical assembly; 21. Light valve housing; 211. Light inlet; 212. Light outlet; 213. Heat-generating area; 214. Heat sink; 22. Light valve; 221. Reflective element; 222. Effective light; 223. Ineffective light; 23. Light source; 24. Projection lens;

[0029] 30. Water cooling system; 31. Radiator; 32. Heat conversion unit; 33. Water pipe; 34. Water pump; 35. Fan. DETAILED DESCRIPTION

[0030] The following is a detailed description of the embodiments of the present invention. It should be emphasized that the following description is only exemplary and is not intended to limit the scope of the present invention and its application.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for both fixing and circuit / signal communication.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0034] like Figures 1 to 3As shown, a preferred embodiment of the present invention discloses a projection device, including a bracket 10, an optical-mechanical assembly 20, and a water-cooling system 30. The optical-mechanical assembly 20 includes a light valve housing 21 and a light valve 22. The light valve 22 is installed in the light valve housing 21. A water flow channel 101 connected to the water-cooling system 30 is opened in the bracket 10. A first heat dissipation surface 102 is formed on the outer surface of the bracket 10 at a position corresponding to the water flow channel 101. The light valve housing 21 is connected to the first heat dissipation surface 102, so that the heat on the light valve housing 21 can be quickly transferred and carried away by the water-cooling liquid.

[0035] The projection device proposed in the preferred embodiment of the present invention introduces a water cooling system 30, and a water flow channel 101 is opened in the bracket 10 to communicate with the flow channel in the water cooling system 30, and the light valve housing 21 where the light valve 22 is located is connected to the outer surface of the bracket 10 at the position corresponding to the water flow channel 101, so that the heat on the light valve housing 21 is transferred to the outer surface of the bracket 10 at the position corresponding to the water flow channel 101, and then the heat is quickly taken away by the water-cooling liquid in the water flow channel 101, thereby achieving efficient heat dissipation of the light valve housing 21, overcoming the bottleneck problem of thermal management efficiency of the high-load light valve 22, and avoiding adverse effects on the light valve 22.

[0036] In a further embodiment, the bracket 10 includes a bracket body 11 and a water-cooling plate 12. The water-cooling plate 12 is detachably connected to the bracket body 11. A water flow channel 101 is defined within the water-cooling plate 12, and a first heat dissipation surface 102 is located on the water-cooling plate 12. Specifically, the water-cooling plate 12 is secured to the bracket body 11 using screws or other fasteners. When optomechanical assemblies 20 of different sizes are required, the water-cooling plate 12 can be replaced with a corresponding configuration, rather than replacing the entire bracket 10. This significantly reduces equipment costs.

[0037] refer to Figure 3 and Figure 4The water-cooling plate 12 includes a first plate body 121 and a second plate body 122 that are detachably connected to each other. The first plate body 121 and / or the second plate body 122 are detachably connected to the bracket body 11. The water flow channel 101 is formed between the first plate body 121 and the second plate body 122. A water inlet pipe 1221 and a water outlet pipe 1222 communicating with the water flow channel 101 are provided on a side of the second plate body 122 away from the first plate body 121. A water inlet 1221 is formed in the water inlet pipe 1221. 23, a water outlet 1223 is formed in the water outlet pipe 1222, that is, the water inlet 1223 and the water outlet 1224 are formed by connecting the pipe holes of the water inlet pipe 1221 and the water outlet pipe 1222 to the side of the second plate 122 near the first plate 121. The water inlet pipe 1221 and the water outlet pipe 1222 are respectively connected to the water cooling system 30. The water inlet 1223 faces one end of the water flow channel 101, and the water outlet 1224 faces the other end of the water flow channel 101. Specifically, the first plate 121 and the second plate 122 can be fixed together by fastening with screws or other fasteners. For example, screws or other fasteners can be passed through the bracket body 11, the second plate 122, and the first plate 121 in sequence so that the first plate 121 and the second plate 122 are simultaneously fixed to the bracket body 11. In another specific example, the first plate 121 and the second plate 122 can be locked and connected first, and then the first plate 121 or the second plate 122 can be locked on the bracket body 11. For example, the second plate 122 is matched with the threaded hole on the bracket plate 11 through the threaded hole 1225 to achieve screw fastening connection.

[0038] In some embodiments, the side of the first plate 121 near the second plate 122 is recessed to form a water channel 101. A plurality of spaced-apart guide posts 103 are protruded from the water channel 101 to guide the water flow, allowing it to flow through a designated area. When the first plate 121 and the second plate 122 are sealed together, the guide posts 103 abut against the second plate 122. In other embodiments, the water channel 101 may also be formed by a recess on one of the sides of the second plate 122 near the first plate 121. In this case, the guide posts 103 protruding from the water channel 101 abut against the first plate 121.

[0039] The water-cooling plate 12 also includes a first seal (not shown) and a second seal (not shown). The first seal abuts the outer edge of the water channel 101 between the first plate 121 and the second plate 122; the second seal abuts between the guide posts 103 and the corresponding plate without the water channel 101. Specifically, the first and second seals can be made of silicone strips that surround the outer edge of the water channel 101 and the guide posts 103 to prevent water-cooling liquid leakage.

[0040] The top surface of the light valve housing 21 is directly in contact with the first heat dissipation surface 102 on the water-cooling plate 12, or is in contact with the first heat dissipation surface 102 on the water-cooling plate 12 via a heat-conducting buffer. Figure 2 In some embodiments, the light valve 22 uses a DMD (Digital Micromirror Device). The DMD chip rotates micromirrors to reflect the light beams that contribute to each frame of the image toward the projection lens 24, while reflecting the light beams that do not contribute to the current frame of the image (ineffective light) away from the projection lens 24 and toward the inner wall of the light valve housing 21 where they are absorbed. The area of the light valve housing 21 that receives the ineffective light reflected by the DMD is the heating area 213. The outer surface of the light valve housing 21 corresponding to the heating area 213 is connected to the first heat dissipation surface 102. That is, the micro-mirrors on the DMD will deflect to an effective angle to reflect the pixel light corresponding to the bright state in each frame toward the light outlet 212, forming effective light 222 to be emitted to the projection lens 24; and the remaining micro-mirrors will deflect to another angle under the control of the circuit to reflect the pixel light corresponding to the dark state in each frame toward the inner wall of the light valve housing 21, forming invalid light 223 so that it cannot pass through the light outlet 212 to reach the projection lens 24. The inner wall area illuminated by the dark state light is recorded as the invalid light illumination area, that is, The heating area 213 is formed by placing the first heat dissipation surface 102 against the outer wall of the light valve housing 21 corresponding to the heating area 213. For example, in some embodiments, the first heat dissipation surface 102 on the water-cooled plate 12 is placed in close contact with the outer wall of the light valve housing 21 corresponding to the heating area 213. This allows the energy of the highest-temperature ineffective light irradiation area in the light valve housing 21 to be directly transferred to the water-cooled plate 12, effectively transferring the heat generated by the ineffective light 223 to the water coolant, and preventing the light valve housing 21 and its internal space from overheating. The connection between the first heat dissipation surface 102 and the light valve housing 21 can be direct contact or indirect contact through elastic members such as thermally conductive foam.

[0041] In some embodiments, the light valve 22 may include not only a DMD but also an LCOS (Liquid Crystal on Silicon) or LCD panel. LCOS is a new type of reflective micro LCD projection technology. Its structure is to grow transistors on a silicon wafer and use semiconductor manufacturing processes to manufacture a driver panel (also known as CMOS-LCD). The transistors are then ground flat using a grinding process and coated with aluminum as a reflector to form a CMOS substrate. The CMOS substrate is then bonded to a glass substrate containing transparent electrodes, and liquid crystal is then introduced for packaging and testing.

[0042] refer to Figure 5The optical engine assembly 20 further includes a reflective element 221, a light source 23 and a projection lens 24. The light source 23, the light valve 22 in the light valve housing 21 and the projection lens 24 are arranged in sequence along the light path. Figure 2 The light valve housing 21 is provided with a light inlet 211 and a light outlet 212. The light inlet 211 is connected to one side of the light source 23, and the light outlet 212 is connected to one side of the projection lens 24. The light beam from the light source 23 enters the light valve housing 21 through the light inlet 211 and is reflected by the reflective element 221 to illuminate the surface of the light valve 22 to achieve modulation. The reflective element 221 is generally a TIR prism. Figure 2 The flat-plate structure is shown schematically. The light valve 22 reflects at least a portion of the effective light toward the reflective element 221, which then passes through the reflective element 221 toward the light outlet 212, ultimately reaching the projection lens 24. The light source 23 and light valve 22 each abut against the heat conversion unit 32 to rapidly dissipate heat. Microchannels are formed within the heat conversion unit 32, each end of which connects to the water cooling system 30. This allows the circulating water from the water cooling system 30 to flow through these channels and quickly remove heat from components connected to the heat conversion unit 32.

[0043] In this embodiment, the back of the optical machine housing where the light source 23 is located and the back of the light valve housing 21 where the light valve 22 is located are both attached to the heat conversion part 32. Specifically, the light source 23 and the projection lens 24 are also respectively arranged in a housing, and the light valve housing 21 is arranged between the housing where the light source 23 is located and the housing where the projection lens 24 is located. Furthermore, the light valve housing 21, the housing where the light source 23 is located and the housing where the projection lens 24 is located can be an integrated structure, that is, an integrated optical machine housing. There are multiple chambers in the integrated optical machine housing, and the light valve 22, the light source 23 and the projection lens 24 are respectively located in a chamber, wherein the chamber where the light valve 22 is located forms the light valve housing 21. Based on the fact that the working surface of the light valve 22 has a large number of rotatable micromirrors, the micromirrors face the inside of the light valve housing 21 and are located on the optical path, which will generate a large amount of heat and determine the main projection imaging quality. In the embodiment of the present invention, the light valve housing 21 dissipates heat in three ways at the same time. First, with reference to Figure 5 , the light valve housing 21 is provided with a heat dissipation fin 214, second, reference Figure 6 , the light valve housing 21 and the first heat dissipation surface 102 on the water cooling plate 12 are offset, third, reference Figure 6 The light valve housing 21 and the heat conversion part 32 are offset against each other. The three heat dissipation methods are combined to achieve more efficient heat dissipation of the light valve housing 21 and avoid adverse effects on the light valve 22.

[0044] refer to Figure 6The water cooling system 30 includes a radiator 31, a heat conversion unit 32, a water pipe 33, a water pump 34, and a fan 35. The radiator 31, water pump 34, and fan 35 are each fixed to the bracket 10. The heat conversion unit 32 abuts the optomechanical assembly 20. For example, the heat conversion unit 32 can be fixedly mounted on the housing of the optomechanical assembly 20 and connect to the back side of the DMD chip and light source 23 on the optomechanical assembly 20, thereby absorbing heat from these high-heat-generating components. The radiator 31, heat conversion unit 32, water pump 34, and water flow channel 101 are connected by the water pipe 33 to form a circulation channel. The air outlet side of the fan 35 faces the radiator 31. Specifically, the radiator 31 is provided with a large number of water microchannels that are connected to the water pump 34 and can circulate. The outer side of the water microchannels is an air hole to release the heat in the circulating liquid into the air. The water outlet and water inlet are connected to the two ends of the water microchannel. The water outlet of the radiator 31 is connected to a number of heat conversion parts 32 in sequence through water pipes 33. The heat conversion parts 32 can be placed against the main heat-generating components of the optical-mechanical assembly, such as the DMD chip and / or other light sources 23, to absorb heat. The heat conversion parts 32 have flow channels for passing water-cooled liquid. The heat conversion parts 32 are also connected to the water pump 34, which provides circulation power for the liquid in the entire water cooling system 30. The liquid eventually returns to the radiator 31 through the water inlet, carrying the heat. The water pipe 33 is, for example, a flexible hose with good elasticity to facilitate connection between various components within the first installation space. The fan 35 is located on one side of the radiator 31 near the enclosure of the bracket 10, with the outlet side of the fan 35 facing outside the enclosure of the bracket 10, blowing air toward the numerous air holes of the radiator 31, thereby removing heat from the radiator 31. It should be noted that the number of heat conversion units 32 in the water cooling system 30 can be one, two, or more; and the water pump 34 can also be connected via a water pipe 33 between the heat conversion unit 32 and the water outlet of the radiator 31; or between the heat conversion unit 32 and the water inlet of the radiator 31; or between two heat conversion units 32. Furthermore, the water pump 34 can also be integrated into the radiator 31.

[0045] In this embodiment, the radiator 31, the heat conversion unit 32, and the water pump 34 are all located on the same side of the water-cooled plate 12. The water-cooled plate 12 is provided with a water inlet pipe 1221 and a water outlet pipe 1222 that are connected to the water flow channel 101, and the water inlet pipe 1221 and the water outlet pipe 1222 are located on the side of the water-cooled plate 12 close to the optical-mechanical assembly 20. The various components in the water-cooling system 30 are arranged on the same side of the water-cooled plate 12, so that the water pipe 33 can be directly connected to the water-cooled plate 12 on this side, shortening the length of the water pipe 33 and reducing the space occupied by the water pipe 33.

[0046] refer to Figure 7, a fixing column 13 is protruding from the bracket 10, and the optical-mechanical assembly 20 is fixed to the fixing column 13 by fasteners such as screws. A circuit board (not shown) is also provided inside the projection device, and the optical-mechanical assembly 20, the circuit board, the radiator 31 of the water-cooling system 30, the water pump 34 and the fan 35 are all fixed on the bracket 10 and surrounded by the bracket 10. For the embodiment including the bracket body 11, the above-mentioned core components of the optical-mechanical assembly 20, the circuit board, and the water-cooling system 30 can be fixedly mounted on the bracket body 11. After the aforementioned components are installed on the bracket 10, the bracket 10 will finally be installed as a whole into the housing of the projection device (not shown in the figure).

[0047] The background section of the present invention may contain background information about the problem or environment of the present invention rather than describing prior art by others. Therefore, the inclusion of content in the background section is not an admission by the applicant that the prior art is available.

[0048] The above description further details the present invention in conjunction with specific / preferred embodiments, and the specific implementation of the present invention should not be construed as being limited to these descriptions. Persons skilled in the art will appreciate that, without departing from the spirit of the present invention, they may make various substitutions or modifications to the described embodiments, and these substitutions or modifications should be considered to fall within the scope of protection of the present invention. Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "preferred embodiments," "examples," "specific examples," or "some examples" indicates that the specific features, structures, materials, or characteristics described in conjunction with such embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and assemble the different embodiments or examples described in this specification, as well as features from different embodiments or examples, without conflicting opinions. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications may be made herein without departing from the scope of the appended claims.

Claims

1. A projection device, characterized in that: The optical-mechanical assembly includes a light valve housing and a light valve, the light valve is installed in the light valve housing, a water flow channel connected to the water cooling system is opened in the bracket, the outer surface of the bracket corresponding to the position of the water flow channel forms a first heat dissipation surface, and the light valve housing is connected to the first heat dissipation surface.

2. The projection device according to claim 1, wherein: The bracket includes a bracket body and a water-cooling plate. The water-cooling plate is detachably connected to the bracket body. The water flow channel is opened inside the water-cooling plate. The first heat dissipation surface is located on the water-cooling plate.

3. The projection device according to claim 2, characterized in that The water-cooling plate includes a first plate body and a second plate body that are detachably connected to each other. The first plate body and / or the second plate body are detachably connected to the bracket body. The water flow channel is formed between the first plate body and the second plate body. A water inlet pipe and a water outlet pipe connected to the water flow channel are provided on a side of the second plate body away from the first plate body. The water inlet pipe and the water outlet pipe are respectively connected to the water cooling system.

4. The projection device according to claim 3, characterized in that One of the side of the first plate body close to the second plate body and the side of the second plate body close to the first plate body is recessed to form the water flow channel, and a plurality of guide columns arranged at intervals are protruded from the water flow channel, and when the first plate body and the second plate body are sealed to each other, the guide columns are abutted against the corresponding plate body without the water flow channel.

5. The projection device according to claim 4, characterized in that: The water-cooling plate also includes a first seal and a second seal. The first seal abuts between the first plate body and the second plate body at the outer edge of the water flow channel; the second seal abuts between the guide column and the corresponding plate body without the water flow channel.

6. The projection device according to claim 1, wherein: The top surface of the light valve housing abuts against the first heat dissipation surface directly or through a heat-conducting buffer.

7. The projection device according to claim 1, wherein: The light valve includes a DMD, an area on the light valve housing for receiving invalid light reflected by the DMD is a heating area, and an outer surface of the light valve housing corresponding to the heating area is in contact with the first heat dissipation surface.

8. The projection device according to claim 1, wherein: The water cooling system includes a radiator, a heat conversion part, a water pipe, a water pump and a fan. The radiator, the water pump and the fan are respectively fixed on the bracket. The heat conversion part abuts against the optical machine component. The radiator, the heat conversion part, the water pump and the water flow channel are connected by the water pipe to form a circulation flow channel. The air outlet side of the fan faces the radiator.

9. The projection device according to claim 8, characterized in that The radiator, the heat conversion unit, and the water pump are all located on the same side of the water-cooling plate. The water-cooling plate is provided with a water inlet pipe and a water outlet pipe connected to the water flow channel, and the water inlet pipe and the water outlet pipe are located on the side of the water-cooling plate close to the optical-mechanical assembly.

10. The projection device according to claim 8, characterized in that The optical-mechanical assembly also includes a light source and a projection lens. The light source, the light valve and the projection lens are arranged in sequence along the light path. The light valve housing is provided with a light inlet and a light outlet. The light inlet is connected to one side of the light source, and the light outlet is connected to one side of the projection lens. The light source and the light valve are respectively abutted against the heat conversion part. A fixing column is protruded from the bracket, and the optical-mechanical assembly is fixed to the fixing column by fasteners.

Images