TWI885721B - Projection device - Google Patents

Abstract

A projection device includes the following features. An illumination system is disposed in a shell and is adapted to provide an illumination beam. An electrical connecting element is located in the shell. A light valve system includes a dustproof module and a light valve module. The dustproof module includes a frame and two transparent plates. The two transparent plates are disposed at two opposite ends of the frame. An accommodation space is formed by the frame and the two transparent plates. The light valve module includes a light valve and an electrical connecting part. The light valve is disposed in the accommodation space. The light valve and the two transparent plates are located on a transmission path of the illumination beam, and the light valve is adapted to transform the illumination beam to an image beam. The electrical connecting part passes through the through hole of the frame, and one end of the electrical connecting part located in the accommodation space is electrically connected to the light valve. Another end of the electrical connecting part located outside the accommodation space is detachably electrically connected to the electrical connecting element. A projection lens is disposed on a transmission path of the image beam.

Description

Projection device

The present invention relates to an imaging device, in particular a projection device.

The imaging method of the projection device is to project light onto the screen, thereby forming an image on the screen. Therefore, compared with the display that directly emits light to the user to form an image, the projection device is more suitable for use in occasions with dim light, such as movie theaters. In addition, the projection device usually takes up less space than the above-mentioned display, and the screen for the projection device to project the image is easier to store than the above-mentioned display, so the projection device is also widely used in offices or conference occasions.

Generally speaking, most of the space inside a projection device is designed as a closed space to accommodate a large number of optical components, thereby preventing the optical components from being contaminated by dust. However, due to the large size of the above-mentioned closed space, this not only limits the heat dissipation mechanism of the projection device, but also increases the assembly and maintenance costs of the projection device.

The "Prior Art" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "Prior Art" section may contain some knowledge that does not constitute the common knowledge in the relevant technical field. The content disclosed in the "Prior Art" section does not mean that the content or the problems to be solved by one or more embodiments of the present invention have been known or recognized by the common knowledge in the relevant technical field before the application of the present invention.

The present invention provides a projection device to maintain dustproof effect and improve heat dissipation efficiency, and also has the advantage of low cost.

Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

In order to achieve one or part or all of the above purposes or other purposes, a projection device of an embodiment of the present invention includes a housing, a lighting system, an electrical connector, a light valve system and a projection lens. The lighting system is disposed in the housing and is suitable for providing an illumination beam. The electrical connector is disposed in the housing. The light valve system includes a dustproof module and a light valve module. The dustproof module includes a frame and two light-transmitting plates. Two light-transmitting plates are respectively disposed at opposite ends of the frame, and the frame and the two light-transmitting plates form a accommodating space. The light valve module includes a light valve and an electrical connector. The light valve is disposed in the accommodating space. The light valve and the two light-transmitting plates are located on the transmission path of the illumination beam, and the light valve is suitable for converting the illumination beam into an image beam. The electrical connection part is inserted through the through hole of the frame, and one end of the electrical connection part in the accommodation space is electrically connected to the light valve. The other end of the electrical connection part outside the accommodation space is detachably electrically connected to the electrical connector. The projection lens is arranged on the transmission path of the image light beam.

In one embodiment of the present invention, the above-mentioned light valve system, for example, also includes a dustproof part. The frame has at least one heat dissipation hole, and the dustproof part is arranged on the frame and covers the heat dissipation hole.

In one embodiment of the present invention, the light valve system may further include two seals. One of the two seals is disposed between the edge of one of the two light-transmitting plates and the frame, and the other of the two seals is disposed between the edge of the other of the two light-transmitting plates and the frame.

In one embodiment of the present invention, the above-mentioned light valve system, for example, further includes a dust barrier, and the dust barrier is arranged between the electrical connection part and the through hole.

In one embodiment of the present invention, the electrical connector may include a card edge connector. The other end of the electrical connection portion outside the accommodation space may include a gold finger that is detachably electrically connected to the card edge connector.

In one embodiment of the present invention, the projection device may further include a fan, wherein the fan is disposed in the housing. The light valve system may further include an air guide. The frame further has at least one air inlet. The air guide is disposed on a side of the frame away from the light valve module, and the air guide is adjacent to the air inlet, and the fan is adapted to generate airflow through the air guide and the air inlet.

In one embodiment of the present invention, the above-mentioned light valve system may also include a dustproof part, which is arranged on the frame and covers the air inlet.

In one embodiment of the present invention, the above-mentioned air guide and electrical connection portion can be located on opposite sides of the frame respectively.

In one embodiment of the present invention, the above-mentioned air guide includes, for example, an air shield. The air shield is suitable for guiding the airflow generated by the fan to the air inlet, and the air shield shields the air inlet in the positive projection direction of the air inlet.

In one embodiment of the present invention, the housing may have a mounting opening, and the light valve system may be detachably fixed to the electrical connector through the mounting opening.

In one embodiment of the present invention, the above-mentioned housing may include a cover, which is suitable for covering or exposing the mounting port.

The projection device of the present invention adopts a light valve system with a dustproof module, wherein the light valve is arranged in the accommodation space of the dustproof module. In this way, the projection device of the present invention can not only maintain the dustproof effect of the light valve, but also make other optical components in the housing easier to dissipate heat, and can more flexibly design the heat dissipation mechanism in the projection device, thereby improving the heat dissipation efficiency of the projection device. In addition, because the light valve system can be disassembled from the housing alone, it can be easily assembled, repaired or replaced, thereby improving the service life of the projection device and reducing the cost of the projection device.

In order to make the above and other purposes, features and advantages of the present invention more clearly understood, the following is a detailed description of the preferred embodiment with the accompanying drawings.

100, 100a, 100b: Projection device

110, 110b: Shell

111: Cover

120: Lighting system

130:Electrical connector

140, 140a, 140b: Light valve system

141: Dustproof module

142: Light valve module

145: Air guide

150: Projection lens

160: Dustproof parts

170: Dust barrier

180: Dustproof parts

1410:Border

1411, 1412: light-transmitting board

1420: Light valve

1421: Electrical connection part

A: Storage space

C: Airflow

CM: Heat dissipation module

D: Orthographic projection direction

E1, E2: end

F1, F2: Fan

H1:Through hole

H2: Heat dissipation hole

L1: illumination beam

L2: Image beam

M: Reflector

N1, N2: Lens

O: Installation port

P: Reflective polarizer

R: Integration column

T:Track

V: Air inlet

V1, V2: vents

W: Windbreak

Figure 1 is a cross-sectional schematic diagram of a projection device according to an embodiment of the present invention.

Figure 2 is a three-dimensional schematic diagram of the light valve system in Figure 1.

Figure 3 is a schematic cross-sectional view of the light valve system in Figure 2 along the A1-A1 section line.

Figure 4 is a partial cross-sectional schematic diagram of a projection device of another embodiment of the present invention.

Figure 5 is a cross-sectional schematic diagram of a light valve system of a projection device in another embodiment of the present invention.

Figure 6 is a cross-sectional schematic diagram of a projection device of another embodiment of the present invention.

The other technical contents, features and effects of the present invention mentioned above will be clearly presented in the detailed description of the preferred embodiment with reference to the following drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and are not used to limit the present invention.

FIG. 1 is a schematic cross-sectional view of a projection device according to an embodiment of the present invention. FIG. 2 is a schematic three-dimensional view of the light valve system of FIG. 1 . FIG. 3 is a schematic cross-sectional view of the light valve system of FIG. 2 along the A1-A1 section line. Referring to FIG. 1 and FIG. 3 , the projection device 100 includes a housing 110, an illumination system 120, an electrical connector 130, a light valve system 140, and a projection lens 150. The illumination system 120 is disposed in the housing 110 and is suitable for providing an illumination beam L1. The electrical connector 130 is disposed in the housing 110. The light valve system 140 includes a dustproof module 141 and a light valve module 142. The dustproof module 141 includes a frame 1410, a light-transmitting plate 1411 (also shown in FIG. 3 ) and 1412. Transparent plates 1411 and 1412 are respectively disposed at opposite ends of the frame 1410, and the frame 1410, the transparent plates 1411 and 1412 form a receiving space A. The light valve module 142 includes a light valve 1420 and an electrical connection portion 1421. The light valve 1420 is disposed in the receiving space A. The light valve 1420, the transparent plates 1411 and 1412 are located on the transmission path of the illumination light beam L1, and the light valve 1420 is suitable for converting the illumination light beam L1 into an image light beam L2. The electrical connection portion 1421 is disposed through the through hole H1 of the frame 1410, and one end E1 of the electrical connection portion 1421 located in the receiving space A is electrically connected to the light valve 1420. The other end E2 (also shown in FIG. 2 ) of the electrical connection portion 1421 outside the accommodation space A is detachably electrically connected to the electrical connection member 130. The projection lens 150 is disposed on the transmission path of the image beam L2.

The light valve system 140 can receive power through the electrical connector 130 and can also be disassembled from the electrical connector 130. In other words, the light valve system 140 can be taken out of the housing 110 alone, thereby having the advantage of being easy to assemble, repair or replace. In this embodiment, the light valve 1420 includes, for example, a liquid crystal panel, and the liquid crystal panel can receive power through the electrical connection portion 1421 and the electrical connector 130 that are electrically connected to each other. In addition, the dustproof module 141 can allow the illumination light beam L1 to be incident on the light valve 1420, and can also isolate dust from entering the accommodating space A, thereby preventing the light valve 1420 from being contaminated by dust. Specifically, the light valve 1420 can be disposed between the light-transmitting plates 1411 and 1412, wherein the light-transmitting plate 1411 is located on the transmission path of the illumination beam L1, so that the illumination beam L1 passes through and enters the light valve 1420. On the other hand, after the light valve 1420 converts the illumination beam L1 into the image beam L2, the image beam L2 can pass through the light-transmitting plate 1412 and be emitted from the dustproof module 141. In this embodiment, the light-transmitting plates 1411 and 1412 are both flat plates, for example. In addition, the material of the light-transmitting plates 1411 and 1412 may include glass, but the present invention is not limited thereto.

Please refer to FIG. 2 and FIG. 3 , the light valve system 140 of the present embodiment further includes a dustproof member 160 (also shown in FIG. 1 ). The frame 1410 may have at least one heat dissipation hole H2, and the present embodiment is exemplified by a plurality of heat dissipation holes H2. The dustproof member 160 is disposed on the frame 1410 and covers the heat dissipation hole H2. Therefore, the airflow can enter and exit the dustproof module 141 through the heat dissipation hole H2, and the dustproof member 160 can maintain the dustproof effect of the dustproof module 141 on the light valve 1420, thereby improving the heat dissipation efficiency of the light valve 1420. In the present embodiment, the dustproof member 160 can be disposed in the heat dissipation hole H2, but other embodiments are not limited thereto. For example, in one embodiment, the dustproof part 160 can be disposed on the inner side or outer side of the frame 1410 and cover the heat dissipation hole H2. The dustproof part 160 of this embodiment includes a filter, so that the aforementioned airflow can more easily enter and exit the dustproof module 141 from the heat dissipation hole H2, thereby further improving the heat dissipation efficiency of the light valve 1420. By the way, the heat dissipation hole H2 can be located on at least one side of the frame 1410, and this embodiment takes the heat dissipation hole H2 as an example of being located on three sides of the frame 1410, but other embodiments are not limited to this. In addition, the present invention does not impose many restrictions on the shape and number of the heat dissipation hole H2.

Please refer to FIG. 1 and FIG. 3 again. In this embodiment, the light valve system 140 further includes a dust barrier 170, which is disposed between the electrical connection portion 1421 and the through hole H1. In other words, the dust barrier 170 can be sealed between the frame 1410 and the electrical connection portion 1421, and cover the through hole H1 to prevent dust from entering the dustproof module 141 through the through hole H1. The dust barrier 170 is, for example, fixed in the through hole H1, and the end E2 of the electrical connection portion 1421 can extend out of the through hole H1. Similarly, in one embodiment, the dust barrier 170 can be fixed to the inner side surface or the outer side surface of the frame 1410. Similarly, the dust barrier 170 of the present embodiment may include a filter to make it easier for airflow to enter and exit the dustproof module 141 from the through hole H1. It is understood that the present invention does not impose any restrictions on the shape of the through hole H1.

Please continue to refer to Figure 1. In this embodiment, the electrical connector 130 can be fixed to the mechanism in the housing 110. The electrical connector 130 can include a card edge connector. The end E2 of the electrical connection portion 1421 located outside the accommodation space A includes, for example, a gold finger that is detachably electrically connected to the aforementioned card edge connector. Furthermore, the gold finger is electrically connected to the light valve 1420, and the light valve 1420 is electrically connected to the card edge connector when the gold finger is inserted into the card edge connector.

The housing 110 may have a mounting port O, and the light valve system 140 is detachably fixed to the electrical connector 130 through the mounting port O. In this way, the light valve system 140 can be placed into the housing 110 or taken out of the housing 110 through the mounting port O, thereby making it easier to assemble and disassemble. Furthermore, the housing 110 may include a cover 111. The cover 111 is suitable for shielding or exposing the mounting port O to enhance the dustproof function of the housing 110. For example, the cover 111 may include a pivoting cover, and in one embodiment, the cover 111 may include a sliding cover. In another embodiment, the housing 110 may not be provided with the mounting port O and the cover 111, and the light valve system 140 may be removed by disassembling the housing 110.

FIG4 is a partial cross-sectional schematic diagram of a projection device of another embodiment of the present invention. Referring to FIG4, in one embodiment, a track T corresponding to the mounting port O may be provided in the housing 110. The light valve system 140 may be placed on the track T from the mounting port O and move along the track T until the electrical connection portion 1421 is fixed and electrically connected to the electrical connector 130. In this way, the light valve system 140 can be installed in the housing 110. Conversely, the light valve system 140 can be removed from the housing 110 by taking it out from the mounting port O along the track T.

Please refer to FIG. 1 again. In this embodiment, the lighting system 120 includes, for example, a light emitting diode (LED), wherein the light emitting diode can generate a lighting beam L1. In detail, the number of the light emitting diodes can be one or more. For example, when the number of the light emitting diodes is multiple, the light emitting diodes can be arranged in a matrix. In one embodiment, the lighting system 120 may include a laser diode (LD), and the aforementioned laser diode generates the lighting beam L1.

The projection lens 150 of this embodiment can be mounted on the housing 110. The projection lens 150 includes, for example, one or more optical lenses, and the refractive powers of the optical lenses can be the same or different. For example, the optical lenses can include various non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses, or any combination of the above non-planar lenses. In one embodiment, the projection lens 150 can also include a planar optical lens, and the present invention does not impose more restrictions on the specific structure of the projection lens 150.

Compared with the prior art, the projection device 100 of the present embodiment adopts a light valve system 140 having a dustproof module 141, wherein the light valve 1420 is disposed in the accommodation space A of the dustproof module 141. In this way, the projection device 100 of the present embodiment can not only maintain the dustproof effect of the light valve 1420, but also make other optical components in the housing 110 easier to dissipate heat, and can more flexibly design the heat dissipation mechanism in the projection device, thereby improving the heat dissipation efficiency of the projection device 100. In addition, because the light valve system 140 can be disassembled from the housing 110 alone, it can be easily assembled, repaired or replaced, thereby improving the service life of the projection device 100 and reducing the cost of the projection device 100.

Incidentally, an integrating rod R, a reflective polarizer P, a reflector M, lenses N1 and N2 may be further disposed in the housing 110. Specifically, the integrating rod R may be disposed on the transmission path of the illumination beam L1, and the lens N1 and the reflective polarizer P may be disposed between the integrating rod R and the light valve system 140, and may allow the illumination beam L1 to pass through and enter the light valve system 140. On the other hand, the lens N2 is disposed on the transmission path of the image beam L2, and the reflector M may reflect the image beam L2 emitted from the lens N2 to the projection lens 150. In this embodiment, the lenses N1 and N2 include, for example, Fresnel lenses, but the present invention is not limited thereto. It is understood that the structures and positions of the optical elements such as the integrating rod R, the reflective polarizer P, the reflector M, the lenses N1 and N2 shown in FIG1 are only examples and are not intended to limit the present invention.

FIG5 is a cross-sectional schematic diagram of a light valve system of a projection device of another embodiment of the present invention. The structure and advantages of the projection device 100a of this embodiment are similar to those of the embodiment of FIG1 , and only the differences are described below. Referring to FIG5 , the light valve system 140a may further include seals 143 and 144. The seal 143 is disposed between the edge R1 of the light-transmitting plate 1411 and the frame 1410, and the seal 144 is disposed between the edge R2 of the light-transmitting plate 1412 and the frame 1410. Therefore, the seal 143 can seal the gap G1 between the light-transmitting plate 1411 and the frame 1410, and the seal 144 can seal the gap G2 between the light-transmitting plate 1412 and the frame 1410, thereby further improving the dustproof effect of the light valve 1420. Incidentally, the light-transmitting plate 1411 can be detachably fixed to the frame 1410 via the seal 143, and the light-transmitting plate 1412 can also be detachably fixed to the frame 1410 via the seal 144. In this way, the light-transmitting plates 1411 and 1412 can be removed and replaced from the frame 1410, respectively, thereby further extending the service life of the light valve system 140a. For example, the seals 143 and 144 of this embodiment may include double-sided tape. Specifically, the light-transmitting plates 1411 and 1412 can be adhered to the frame 1410 by the double-sided adhesive, and the double-sided adhesive can fill the gaps G1 and G2. In one embodiment, the seals 143 and 144 include, for example, a mechanism, wherein the light-transmitting plates 1411 and 1412 can be fixed to the frame 1410 via the mechanism, and the mechanism can be embedded in the gaps G1 and G2.

FIG6 is a schematic cross-sectional view of a projection device of another embodiment of the present invention. The structure and advantages of the projection device 100b of this embodiment are similar to those of the embodiment of FIG1 , and only the differences are described below. Referring to FIG6 , the projection device 100b may further include a fan F1, wherein the fan F1 is disposed in the housing 110b. The light valve system 140b, for example, further includes an air guide 145. The frame 1410 further has at least one air inlet V, and FIG6 illustrates an example of an air inlet V. The air guide 145 is disposed on a side of the frame 1410 facing away from the light valve module 142, and the air guide 145 is adjacent to the air inlet V, and the fan F1 is suitable for generating an airflow C through the air guide 145 and the air inlet V. Specifically, the air guide 145 can guide the airflow C from the air inlet V into the dustproof module 141, so that the airflow C flows through the light valve 1420 and flows out of the dustproof module 141 from the through hole H1. In this way, the heat dissipation efficiency of the light valve 1420 can be further improved.

In this embodiment, the light valve system 140b may further include a dustproof member 180. The dustproof member 180 is disposed on the frame 1410 and covers the air inlet V to further enhance the dustproof effect on the light valve 1420. For example, the dustproof member 160 shown in FIG. 2 can be used as the dustproof member 180 of FIG. 6, and the features of the dustproof members 160 and 180 are substantially the same, so the relevant description is omitted here. Similarly, the portion of the heat dissipation hole H2 shown in FIG. 2 that is opposite to the through hole H1 can be used as the air inlet V of FIG. 6, but the present invention does not impose many restrictions on the specific features of the air inlet V. The dust barrier 170 of this embodiment may include a filter so that the airflow C can more easily pass through the dust barrier 170 and flow out of the dustproof module 141. Incidentally, the fan F1 includes, for example, a blower fan, but the present invention is not limited thereto. In addition, the housing 110b may be provided with a vent hole V1 corresponding to the fan F1 to allow the airflow C to enter the housing 110b

In this embodiment, the air guide 145 includes, for example, an air shield W. The air shield W is suitable for guiding the airflow C generated by the fan F1 to the air inlet V, and the air shield W shields the air inlet V in the positive projection direction D of the air inlet V. For example, the shape of the air shield W can be arc-shaped, so that the airflow C can be guided into the dustproof module 141 more quickly, thereby further improving the heat dissipation efficiency of the light valve 1420. By the way, the air guide 145 can be fixed to the edge of the air inlet V, and is located on the opposite sides of the air inlet V with the fan F1 to guide more airflow C into the dustproof module 141. In addition, the air guide 145 is located between the air inlet V and the mounting port O. In the positive projection direction D of the air inlet V, the air guide 145 can cover the mounting port O. In this way, when the airflow C generated by the fan F1 flows between the air guide 145 and the air inlet V, it can flow into the accommodation space A through the air inlet V to the greatest extent. In other words, it can prevent excessive airflow C from flowing out of the housing 110b from the mounting port O, thereby guiding more airflow C into the dustproof module 141.

The air guide 145 and the electrical connection portion 1421 can be located on opposite sides of the frame 1410. Specifically, the air guide 145 can face the mounting port O and can be used as a handle of the light valve system 140b. In this way, when the light valve system 140b is fixed to the electrical connection 130, the user can hold the air guide 145 through the mounting port O, and then take the light valve system 140b out of the housing 110b through the air guide 145, making it easier to disassemble the light valve system 140b from the housing 110b. In addition, since the air guide 145 can be used as a handle of the light valve system 140b, the light valve system 140b also has the advantage of a simple structure.

Incidentally, the projection device 100b may also be configured with a heat dissipation module CM and a fan F2 to dissipate heat from the lighting system 120. Specifically, the heat dissipation module CM may be connected to the lighting system 120 to receive the heat energy generated by the lighting system 120. The fan F2 may dissipate heat from the heat dissipation module CM. Furthermore, the heat dissipation module CM may include, for example, a plurality of fins, and the fan F2 may guide the airflow C through the fins. Similarly, the housing 110b may also be provided with a vent V2 corresponding to the fan F2 to allow the airflow C to flow out of the housing 110b. The features and functions of the vent V2 are substantially the same as those of the vent V1, so the relevant description is omitted here. It is understood that the flow direction of the airflow C is not limited to that shown in FIG. 6 . For example, in one embodiment, the airflow C can be sucked into the housing 110b through the vent hole V2 by the fan F2, and then blown out of the housing 110b through the vent hole V1 by the fan F1.

In summary, the projection device of the embodiment of the present invention has at least one of the following advantages. The projection device of the present invention adopts a light valve system with a dustproof module, wherein the light valve is arranged in the accommodation space of the dustproof module. In this way, the projection device of the present invention can not only maintain the dustproof effect of the light valve, but also make other optical components in the housing easier to dissipate heat, and can more flexibly design the heat dissipation mechanism in the projection device. In addition, because the light valve system can be disassembled from the housing alone, it can be easily assembled, repaired or replaced, thereby increasing the service life of the projection device and reducing the cost of the projection device.

However, the above is only the preferred embodiment of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made according to the scope of the patent application and the content of the invention description of the present invention are still within the scope of the present invention. In addition, any embodiment or patent application scope of the present invention does not need to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract part and the title are only used to assist the search of patent documents, and are not used to limit the scope of rights of the present invention.

100: Projection device

110: Shell

111: Cover

120: Lighting system

130:Electrical connector

140: Light valve system

141: Dustproof module

142: Light valve module

150: Projection lens

160: Dustproof parts

170: Dust barrier

1410:Border

1411, 1412: light-transmitting board

1420: Light valve

1421: Electrical connection part

A: Storage space

E1, E2: end

H1:Through hole

H2: Heat dissipation hole

L1: illumination beam

L2: Image beam

M: Reflector

N1, N2: Lens

O: Installation port

P: Reflective polarizer

R: Integration column

Claims (11)

A projection device, comprising: a housing; an illumination system, disposed in the housing and adapted to provide an illumination beam; an electrical connector, disposed in the housing; a light valve system, comprising: a dustproof module, the dustproof module comprising a frame and two light-transmitting plates, the two light-transmitting plates being disposed at opposite ends of the frame, the frame and the two light-transmitting plates forming a containing space; a dustproof part, the dustproof part being disposed in the frame of the dustproof module, the dustproof module being configured such that an airflow can pass through the dustproof part to enter and exit the containing space; and A light valve module, the light valve module includes a light valve and an electrical connection part, the light valve is arranged in the accommodation space, the light valve and the two light-transmitting plates are located on the transmission path of the illumination light beam, and the light valve is suitable for converting the illumination light beam into an image light beam, the electrical connection part is penetrated through a through hole of the frame, and one end of the electrical connection part in the accommodation space is electrically connected to the light valve, and the other end of the electrical connection part outside the accommodation space is detachably electrically connected to the electrical connection part; and a projection lens, arranged on the transmission path of the image light beam. A projection device as described in claim 1, wherein the frame has at least one heat dissipation hole, and the dustproof member covers the at least one heat dissipation hole. A projection device as described in claim 1, wherein the light valve system further includes two seals, one of the two seals is arranged between the edge of one of the two light-transmitting plates and the frame, and the other of the two seals is arranged between the edge of the other of the two light-transmitting plates and the frame. A projection device as described in claim 1, wherein the light valve system further includes a dust barrier, which is arranged between the electrical connection portion and the through hole. The projection device as described in claim 1, wherein the electrical connector includes a card edge connector, and the other end of the electrical connection portion outside the accommodating space includes a gold finger that is detachably electrically connected to the card edge connector. The projection device as described in claim 1 further includes a fan, wherein the fan is disposed in the housing, the light valve system further includes an air guide, the frame further has at least one air inlet, the air guide is disposed on a side of the frame away from the light valve module, the air guide is adjacent to the at least one air inlet, and the fan is suitable for generating airflow through the air guide and the at least one air inlet. A projection device as described in claim 6, wherein the dustproof component is disposed on the frame and covers the at least one air inlet. A projection device as described in claim 6, wherein the air guide and the electrical connection portion are respectively located on opposite sides of the frame. A projection device as described in claim 6, wherein the wind guide member includes a wind shielding wall, which is suitable for guiding the airflow generated by the fan to the at least one air inlet, and the wind shielding wall shields the at least one air inlet in the orthographic projection direction of the at least one air inlet. A projection device as described in claim 1, wherein the housing has a mounting opening, and the light valve system is detachably fixed to the electrical connector through the mounting opening. A projection device as described in claim 10, wherein the housing includes a cover adapted to shield or expose the mounting port.

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