Projection equipment and projection system

Abstract

The utility model provides projection equipment and a projection system, and relates to the technical field of projection, and the projection equipment comprises a digital micromirror device which is provided with a lens layer, and the circumferential direction of the lens layer is provided with a side edge; at least part of the piezoelectric fan is arranged opposite to the side edge; the piezoelectric fan includes: a piezoelectric member; one end of the fan blade is connected to the piezoelectric piece, and the other end of the fan blade extends towards the lens layer; and the piezoelectric piece is configured to drive the fan blades to vibrate under the driving of voltage so as to generate airflow flowing to the lens layer. According to the projection equipment and the projection system provided by the invention, the digital micro-mirror device can be efficiently cooled, so that the normal work of the digital micro-mirror device is ensured.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and in particular to a projection device and a projection system. Background Art

[0002] DLP (Digital Light Processing) projection system has the advantages of high light efficiency, high contrast, long life, high precision and good color. Currently, most of them use DLP technology for display imaging.

[0003] In the prior art, a DLP projection system realizes image display by controlling pixel micromirrors on a digital micromirror device (DMD) to reflect light.

[0004] However, as the brightness of the projection equipment increases, the light power irradiated on the DMD becomes higher and higher, and the temperature of the pixel micromirrors inside the DMD also becomes higher and higher, thereby affecting the normal operation of the DMD and causing the DMD to fail during operation. Utility Model Content

[0005] In view of the above problems, the present application provides a projection device and a projection system, which can efficiently dissipate heat for a digital micromirror device, thereby ensuring the normal operation of the digital micromirror device.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A first aspect of the present application provides a projection device, comprising:

[0008] A digital micromirror device comprises a lens layer, wherein the lens layer has side edges in a circumferential direction;

[0009] A piezoelectric fan, at least part of which is disposed opposite to the side edge;

[0010] Piezoelectric fans include:

[0011] Piezoelectric components;

[0012] A fan blade, one end of the fan blade is connected to the piezoelectric element, and the other end of the fan blade extends toward the lens layer;

[0013] The piezoelectric element is configured to drive the fan blades to vibrate under the drive of voltage to generate airflow toward the lens layer.

[0014] The beneficial effect of the present application is that the airflow generated when the fan blades vibrate can exchange heat with the lens layer and transfer the heat of the lens layer to the outside, thereby efficiently dissipating the heat of the digital micromirror device, ensuring the normal operation of the digital micromirror device, and extending the service life of the digital micromirror device and the projection equipment.

[0015] In one possible implementation, the lens layer is used to reflect incident light, and the incident light is configured to be arranged obliquely to a side surface of the lens layer along the thickness direction; there are multiple side edges, and when the incident light is inclined toward one of the side edges, at least one of the remaining side edges is arranged opposite to the piezoelectric fan.

[0016] In this way, the piezoelectric fan will not block the incident light, ensuring that the incident light can smoothly project to the surface of the lens layer.

[0017] In a possible implementation, multiple side edges are arranged in pairs, and any pair of side edges arranged in pairs are distributed on opposite sides of the lens layer; when the incident light is inclined toward one of the pair of side edges, the other side edge is arranged opposite to the piezoelectric fan.

[0018] In this way, when the other side is arranged opposite to the piezoelectric fan, the piezoelectric fan can directionally cool the surface of the lens layer close to the side to achieve rapid cooling, thereby improving the uniformity of temperature distribution on the lens layer.

[0019] In one possible implementation, the side edges include two first side edges arranged opposite to each other along a first direction and two second side edges arranged opposite to each other along a second direction; the first direction and the second direction are arranged crosswise, and the length of the first side edge is greater than the length of the second side edge; when the incident light is inclined toward one of the two first side edges, the other first side edge is arranged opposite to the piezoelectric fan; or, when the incident light is inclined toward one of the two second side edges, the other second side edge is arranged opposite to the piezoelectric fan.

[0020] In this way, the piezoelectric fan can directionally cool the surface of the lens layer close to the other first side edge or the other second side edge to achieve rapid cooling, thereby improving the uniformity of temperature distribution on the lens layer.

[0021] In a possible implementation, the blade surface of the fan blade is parallel to a side surface of the lens layer along the thickness direction.

[0022] In this way, the space occupied by the digital micromirror device and the piezoelectric fan is reduced along the direction perpendicular to the blade surface, which facilitates the miniaturization of the projection equipment.

[0023] In a possible implementation, the blade surface of the fan blade intersects with a side surface of the lens layer along the thickness direction.

[0024] In this way, the user can set the position of the fan blades according to the actual installation structure.

[0025] In a possible implementation, the projection device further includes an engine housing, the piezoelectric fan further includes a fixing member, and the piezoelectric member is connected to the engine housing via the fixing member.

[0026] In this way, the existence of the engine housing facilitates the installation of the piezoelectric fan; when the airflow flows to the lens layer, the airflow can transfer the heat to the engine housing, and the engine housing can transfer the heat to the outside air.

[0027] In a possible implementation, the piezoelectric fan further includes a connecting member, and the fan blades are connected to the piezoelectric member via the connecting member.

[0028] In this way, the existence of the connecting piece makes it easier to connect the connecting piece to the piezoelectric piece.

[0029] In a possible implementation, the piezoelectric element is a piezoelectric ceramic sheet, and a surface of the piezoelectric element extending in the thickness direction is connected to a blade surface of the fan blade.

[0030] In this way, when the piezoelectric element is a piezoelectric ceramic sheet, it is convenient for the piezoelectric element to drive the fan blades to vibrate under the inverse piezoelectric effect.

[0031] In a possible implementation, a plurality of piezoelectric fans are provided, and the plurality of piezoelectric fans are arranged in a one-to-one correspondence with a plurality of different side edges.

[0032] In this way, multiple piezoelectric fans cooperate with each other to generate more airflow, thereby improving the heat dissipation capacity of the digital micromirror device.

[0033] A second aspect of the present application provides a projection device, comprising:

[0034] A digital micromirror device for providing a lens layer;

[0035] A piezoelectric fan, at least part of which is arranged opposite to the circumferential side of the lens layer;

[0036] The piezoelectric fan is used to provide a piezoelectric component and a fan blade, one end of the fan blade is used to be connected to the piezoelectric component, and the other end is used to extend toward the lens layer; the piezoelectric component is configured to drive the fan blade to vibrate under the drive of voltage to generate an airflow toward the lens layer.

[0037] A third aspect of the present application provides a projection system, comprising a projection screen and a projection device in any of the above implementations, wherein the projection device is used to project a projection picture onto the projection screen.

[0038] In the projection device provided by the present application, the airflow generated when the fan blades vibrate can exchange heat with the lens layer, and transfer the heat of the lens layer to the outside world, so that the digital micromirror device can be efficiently dissipated to ensure the normal operation of the digital micromirror device. In addition, compared with other fans with rotating blades, the piezoelectric fan provided by the present application uses the vibration of the fan blades to generate airflow, the flow of the airflow is more orderly, and the flow direction is more parallel; and the airflow has good concentration, and the airflow can be used to carry out directional cooling of the position with high temperature of the lens layer to achieve rapid cooling, thereby solving the problem of uneven temperature distribution of the lens layer, and improving the service life of the digital micromirror device and the projection device. In addition, when the fan blades vibrate at a higher frequency, a larger airflow can be generated, with low noise and low power consumption; the size of the generated airflow can also be controlled by controlling the vibration frequency of the fan blades, thereby accurately regulating the temperature of the lens layer.

[0039] The structure of the present application and its other inventive objectives and beneficial effects will be more clearly understood through the description of the specific implementation methods in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 A three-dimensional diagram of a digital micromirror device in the prior art;

[0042] Figure 2 It is a left view of a digital micromirror device in the prior art;

[0043] Figure 3 A top view of a digital micromirror device in the prior art;

[0044] Figure 4 A structural diagram of a piezoelectric fan provided in an embodiment of the present application;

[0045] Figure 5 A first installation view of a digital micromirror device and a piezoelectric fan provided in an embodiment of the present application;

[0046] Figure 6 For Figure 5 The corresponding left view;

[0047] Figure 7 A second installation view of a digital micromirror device and a piezoelectric fan provided in an embodiment of the present application;

[0048] Figure 8For Figure 7 The corresponding main view;

[0049] Fig. 9 For Figure 8 Another view corresponding to it;

[0050] Fig.10 For Figure 8 Another view corresponding to it;

[0051] Fig.11 A schematic diagram of the projection device provided in an embodiment of the present application when projecting onto a projection screen.

[0052] Description of reference numerals:

[0053] 10-projection equipment; 100-digital micromirror device;

[0054] 110- lens layer; 111- side edge;

[0055] 111A-first side; 111B-second side;

[0056] 120-mechanical control layer; 130-chip control layer;

[0057] 200- piezoelectric fan; 210- piezoelectric element;

[0058] 211- one-sided; 220- fan blade;

[0059] 221- blade surface; 230- fixing member;

[0060] 240-connector; 250-vibration direction;

[0061] 260-first limit position; 270-second limit position;

[0062] 300-incident light; 400-reflected light;

[0063] 500-airflow; 600-housing;

[0064] 20-Projection screen. DETAILED DESCRIPTION

[0065] In the prior art, the DLP projection system realizes image display by controlling the pixel micromirrors on the digital micromirror device (DMD) to reflect light. Figures 1 to 3As shown, the structure of the digital micromirror device 100 can be divided into three layers: a lens layer 110, a mechanical control layer 120, and a chip control layer 130. The pixel micromirrors are located in the lens layer 110. The heat generated by the chip control layer 130 is not much. The heat mainly comes from the heat generated by the mirror surface in the lens layer 110 being irradiated by the incident light 300, which causes the temperature of the digital micromirror device 100 to rise. As the brightness of the projection device increases, the light power irradiated on the digital micromirror device becomes higher and higher, and the temperature of the pixel micromirrors inside the digital micromirror device also becomes higher and higher, thereby affecting the normal operation of the digital micromirror device and causing the digital micromirror device to fail during operation.

[0066] For example, when the temperature of the digital micromirror device 100 rises, there will be a temperature difference between the lens layer 110 and the chip control layer 130. When the temperature difference exceeds the specification parameters of the DMD, it will cause the DMD to fail. The main reason for the failure is the mechanical failure caused by the temperature, which in turn causes the image projected by the projection device to have the problem of missing pixels, and the projection image cannot be fully presented.

[0067] Based on the above problems, the embodiments of the present application provide a projection device and a projection system, wherein the projection system includes a projection device, wherein the projection device includes a digital micromirror device and a piezoelectric fan, wherein the digital micromirror device has a lens layer, wherein the lens layer has a side edge in the circumference, and at least part of the piezoelectric fan is arranged opposite to the side edge; wherein the piezoelectric fan includes a piezoelectric element and a fan blade, wherein one end of the fan blade is connected to the piezoelectric element and the other end extends toward the lens layer, and the piezoelectric element is configured to drive the fan blade to vibrate under the drive of a voltage to generate an airflow to the lens layer. Thus, the airflow generated when the fan blade vibrates can exchange heat with the lens layer and transfer the heat of the lens layer to the outside, thereby efficiently dissipating heat from the digital micromirror device and ensuring the normal operation of the digital micromirror device.

[0068] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0069] The following specific embodiments are used to describe in detail the technical solution of the present application and how the technical solution of the present application solves the above technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0070] The following combination Figures 4 to 11, the structure of the projection device and the projection system provided in the embodiments of the present application are described in detail.

[0071] The projection device provided in the embodiment of the present application includes:

[0072] like Figures 4 to 8 As shown, the projection device 10 provided in the present application includes:

[0073] The digital micromirror device 100 comprises a lens layer 110, and the lens layer 110 has a side edge 111 in the circumferential direction. It should be noted that the pixel micromirrors of the digital micromirror device 100 are located in the lens layer 110, so that when the incident light 300 is irradiated on the mirror surface of the lens layer 110, the lens layer 110 can reflect the incident light 300, and at the same time, the temperature of the lens layer 110 will also increase. The mirror surface is a side surface of the lens layer 110 along the thickness direction for reflecting the incident light 300.

[0074] The piezoelectric fan 200, at least part of the piezoelectric fan 200 is disposed opposite to the side edge 111; it should be noted that the piezoelectric fan 200 is disposed opposite to a certain side edge 111, which means that the piezoelectric fan 200 is located on the side of the lens layer 110 where the side edge 111 is provided, and there is a gap between the piezoelectric fan 200 and the side edge 111. In addition, all components of the piezoelectric fan 200 are disposed opposite to the side edge 111, or only part of the components of the piezoelectric fan 200 may be disposed opposite to the side edge 111.

[0075] Specifically, the piezoelectric fan 200 includes:

[0076] Piezoelectric element 210; specifically, the piezoelectric element 210 may be a piezoelectric ceramic element. Due to the inverse piezoelectric effect of the piezoelectric ceramic material, the piezoelectric element 210 may produce periodic contraction and expansion, thereby driving other objects to move. In addition, the piezoelectric element 210 may also be made of other piezoelectric materials.

[0077] The fan blade 220 has one end connected to the piezoelectric element 210 and the other end extending toward the lens layer 110; thus, the piezoelectric element 210 can drive the fan blade 220 to vibrate under the drive of voltage to generate an airflow 500 flowing toward the lens layer 110. When the piezoelectric element 210 generates periodic contraction and expansion under the action of voltage, the piezoelectric element 210 can drive the fan blade 220 to generate bending resonance, and the fan blade 220 generates an airflow 500 during the vibration process. Figure 4 As shown, the figure shows the vibration direction 250 of the fan blade 220. The fan blade 220 can vibrate in two opposite directions and has a first extreme position 260 and a second extreme position 270 during the vibration process.

[0078] It should be noted that when the fan blade 220 vibrates, a series of vortex strings will be generated around the fan blade 220. These vortex strings will interfere and merge with the surrounding fluid during development and movement, thereby aggregating into a continuous airflow 500. The airflow 500 is transmitted from the end of the fan blade 220 close to the piezoelectric element 210 to the end of the fan blade 220 close to the lens layer 110. Since the airflow 500 generated by the fan blade 220 is also accompanied by the characteristics of vortex, the airflow 500 can play a role in forced convection heat exchange.

[0079] Thus, in the projection device 10 provided by the present application, the airflow 500 generated when the fan blades 220 vibrate can exchange heat with the lens layer 110, and transfer the heat of the lens layer 110 to the outside, so that the digital micromirror device 100 can be efficiently cooled, and the normal operation of the digital micromirror device 100 can be ensured. In addition, compared with other fans with rotating blades, the piezoelectric fan 200 provided by the present application uses the vibration of the fan blades 220 to generate the airflow 500, and the flow of the airflow 500 is more orderly and the flow direction is more parallel; and the airflow 500 has good concentration, and the airflow 500 can be used to carry out directional cooling of the position with high temperature of the lens layer 110 to achieve rapid cooling, thereby solving the problem of uneven temperature distribution of the lens layer 110 and improving the service life of the digital micromirror device 100 and the projection device 10.

[0080] In addition, when the fan blades 220 vibrate at a higher frequency, a larger airflow 500 can be generated, with less noise and lower power consumption. Thus, the size of the generated airflow 500 can be controlled by controlling the vibration frequency of the fan blades 220, thereby accurately adjusting the temperature of the lens layer 110; and the vibration amplitude of the fan blades 220 can also be controlled, so that the piezoelectric fan 200 can be used in a small and closed environment.

[0081] Specifically, the heat on the lenses in the lens layer 110 will be transferred to the air. When the airflow 500 flows to the lens layer 110, the airflow 500 can transfer the heat to the engine housing in the projection device 10, and the engine housing transfers the heat to the outside air, thereby completing the entire heat transfer process.

[0082] In the embodiments of the present application, Figures 5 to 8As shown, the lens layer 110 is used to reflect the incident light 300, and the incident light 300 is arranged obliquely to one side surface of the lens layer 110 along the thickness direction; and the reflected light 400 formed after reflection by the lens layer 110 is arranged perpendicular to one side surface of the lens layer 110 along the thickness direction. In addition, a plurality of side edges 111 are provided, and when the incident light 300 is inclined toward one of the side edges 111, at least one of the remaining side edges 111 is arranged opposite to the piezoelectric fan 200; in this way, the piezoelectric fan 200 will not block the incident light 300, thereby ensuring that the incident light 300 can smoothly project to the surface of the lens layer 110. Specifically, as Figure 5 and Figure 7 As shown, the piezoelectric fan 200 is provided with one, and when the incident light 300 is inclined toward one of the side edges 111, one of the remaining side edges 111 is arranged opposite to the piezoelectric fan 200; or, the piezoelectric fan 200 is provided with multiple, and when the incident light 300 is inclined toward one of the side edges 111, multiple side edges 111 among the remaining side edges 111 are arranged opposite to multiple piezoelectric fans 200 in a one-to-one correspondence.

[0083] Further, such as Figure 5 and Figure 7 As shown, a plurality of side edges 111 are arranged in pairs, and any pair of side edges 111 arranged in pairs are distributed on opposite sides of the lens layer 110; when the incident light 300 is inclined toward one of the side edges 111 of the pair, the other side edge 111 is arranged opposite to the piezoelectric fan 200. It should be noted that when the incident light 300 is inclined toward the surface of the lens layer 110, the optical path of the incident light 300 at different positions on the surface of the lens layer 110 is different, so that the temperature at different positions on the surface of the lens layer 110 is also different; the longer the optical path of the incident light 300, the larger the light spot formed at the irradiated position, and the higher the temperature. Therefore, when the incident light 300 is inclined toward one of the side edges 111 of the pair, the closer the surface of the lens layer is to the other side edge 111, the higher the temperature of the surface of the lens layer. Therefore, when the other side 111 is arranged opposite to the piezoelectric fan 200 , the piezoelectric fan 200 can directionally cool the surface of the lens layer close to the side 111 to achieve rapid cooling, thereby improving the uniformity of temperature distribution on the lens layer 110 .

[0084] Specifically, Figure 5 and Figure 7As shown, the side edges 111 include two first side edges 111A arranged opposite to each other along a first direction and two second side edges 111B arranged opposite to each other along a second direction; the first direction and the second direction are arranged crosswise, and the length of the first side edge 111A is greater than the length of the second side edge 111B; the first side edge 111A is the long side of the lens layer 110, and the second side edge 111B is the short side of the lens layer 110. Specifically, the first direction and the second direction can be arranged perpendicular to each other, and in this case, the lens layer 110 is rectangular.

[0085] For example, Figure 5 and Figure 6 As shown, when the incident light 300 is inclined toward one of the two first side edges 111A, the other first side edge 111A is arranged opposite to the piezoelectric fan 200; at this time, the piezoelectric fan 200 can perform directional cooling on the surface of the lens layer close to the other first side edge 111A to achieve rapid cooling, thereby improving the uniformity of temperature distribution on the lens layer 110.

[0086] For example, Figure 7 and Figure 8 As shown, when the incident light 300 is inclined toward one of the two second side edges 111B, the other second side edge 111B is arranged opposite to the piezoelectric fan 200; at this time, the piezoelectric fan 200 can perform directional cooling on the surface of the lens layer close to the other second side edge 111B to achieve rapid cooling, thereby improving the uniformity of temperature distribution on the lens layer 110.

[0087] In a specific embodiment, Figure 6 and Figure 8 As shown, the blade surface 221 on the fan blade 220 is parallel to one side surface of the lens layer 110 along the thickness direction. With such an arrangement, the space occupied by the digital micromirror device 100 and the piezoelectric fan 200 is reduced along the direction perpendicular to the blade surface 221, which facilitates the miniaturization of the projection device 10. Furthermore, the blade surface 221 on the fan blade 220 can be flush with one side surface of the lens layer 110 along the thickness direction for reflecting the light 400. It should be noted that the blade surface 221 on the fan blade 220 is parallel to one side surface of the lens layer 110 along the thickness direction, which means that the blade surface 221 of the fan blade 220 is parallel to one side surface of the lens layer 110 along the thickness direction when the fan blade 220 is in a stationary state.

[0088] In another specific embodiment, Fig. 9 and Fig.10 As shown, the blade surface 221 of the fan blade 220 crosses the surface of one side of the lens layer 110 along the thickness direction; the user can set the position of the fan blade 220 according to the actual installation structure. Fig. 9As shown, the blade surface 221 of the fan blade 220 can be inclined to one side surface of the lens layer 110 along the thickness direction, so that the space occupied by the digital micromirror device 100 and the piezoelectric fan 200 is reduced along the direction parallel to the mirror surface on the lens layer 110, and the mirror surface is a side surface of the lens layer 110 along the thickness direction for reflecting the incident light 300. For example, Fig.10 As shown, the blade surface 221 of the fan blade 220 may also be perpendicular to a side surface of the lens layer 110 along the thickness direction.

[0089] In the embodiments of the present application, Figure 4 As shown, the projection device 10 also includes an engine housing, and the piezoelectric fan 200 also includes a fixing member 230, and the piezoelectric member 210 is connected to the engine housing through the fixing member 230; with such an arrangement, the presence of the engine housing facilitates the installation of the piezoelectric fan 200. In addition, when the airflow 500 flows to the lens layer 110, the airflow 500 can transfer heat to the engine housing, and the engine housing can transfer the heat to the outside air. Furthermore, the digital micromirror device 100 can also be installed on the engine housing and be thermally conductive with the engine housing, so that the digital micromirror device 100 can transfer heat to the engine housing, thereby achieving a cooling effect.

[0090] In the embodiments of the present application, Figure 4 As shown, the piezoelectric fan 200 also includes a connector 240, and the fan blade 220 is connected to the piezoelectric component 210 through the connector 240; the existence of the connector 240 facilitates the connection of the connector 240 to the piezoelectric component 210. Specifically, the connector 240 can be a connecting glue layer or an adhesive. In addition, the piezoelectric component 210 can be a piezoelectric ceramic sheet, and a side surface of the piezoelectric component 210 extending in the thickness direction is connected to the blade surface 221 of the fan blade 220, that is, the sheet surface 211 of the piezoelectric component 210 extending in the thickness direction is connected to the blade surface 221; when the piezoelectric component 210 is a piezoelectric ceramic sheet, it is convenient for the piezoelectric component 210 to drive the fan blade 220 to vibrate under the inverse piezoelectric effect.

[0091] In the embodiment of the present application, a plurality of piezoelectric fans 200 may be provided, and the plurality of piezoelectric fans 200 are arranged one by one with the plurality of different side edges 111; the plurality of piezoelectric fans 200 cooperate with each other to generate more airflow 500, thereby improving the heat dissipation capacity of the digital micromirror device 100. Or, as Figure 5 and Figure 7 As shown, only one piezoelectric fan 200 is provided, and the piezoelectric fan 200 is disposed opposite to only one side edge 111 .

[0092] In addition, the present application also provides a projection device 10, including: a digital micromirror device 100 and a piezoelectric fan 200, the digital micromirror device 100 is used to provide a lens layer 110, and at least part of the piezoelectric fan 200 is used to be arranged opposite to the circumferential side 111 of the lens layer 110; the piezoelectric fan 200 is used to provide a piezoelectric element 210 and a fan blade 220, one end of the fan blade 220 is used to be connected to the piezoelectric element 210, and the other end is used to extend toward the lens layer 110; the piezoelectric element 210 is configured to drive the fan blade 220 to vibrate under the drive of voltage to generate an airflow 500 flowing to the lens layer 110.

[0093] On the basis of the above embodiments, the present application further provides a projection system, including a projection screen 20 and a projection device 10 in any one of the above embodiments, wherein the projection device 10 is used to project a projection picture onto the projection screen 20 .

[0094] Specifically, Fig.11 As shown, the projection device 10 has a housing 600, and the housing 600 has a receiving cavity inside, and the digital micromirror device 100, the piezoelectric fan 200 and the engine housing are all located in the receiving cavity. In addition, Fig.11 , a scene diagram when the projection device 10 is projecting onto the projection screen 20 is shown. The projection screen 20 is located obliquely above the projection device 10. The projection screen 20 can be set on a flat mounting carrier such as a wall to ensure the flatness of the projection screen 20. The reflected light 400 reflected by the digital micromirror device 100 can be directed toward the lens, and the light directed toward the lens can pass through the lens and form an image on the projection screen 20.

[0095] In the description of the present application, it should be understood that, in addition, the terms "including" and "having" and any variations thereof are intended to cover but not exclude inclusion. The orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0097] For ease of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are intended to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A projection device, characterized in that: include: A digital micromirror device, comprising a lens layer, wherein the lens layer has side edges in a circumferential direction; a piezoelectric fan, at least part of which is disposed opposite to the side edge; The piezoelectric fan comprises: Piezoelectric components; A fan blade, one end of which is connected to the piezoelectric element, and the other end of which extends toward the lens layer; The piezoelectric element is configured to drive the fan blades to vibrate under the drive of voltage to generate airflow toward the lens layer.

2. The projection device according to claim 1, characterized in that: The lens layer is used to reflect incident light, and the incident light is configured to be arranged obliquely to a side surface of the lens layer along the thickness direction; There are a plurality of side edges, and when the incident light is inclined toward one of the side edges, at least one of the remaining side edges is arranged opposite to the piezoelectric fan.

3. The projection device according to claim 2, characterized in that: The plurality of side edges are arranged in pairs, and any pair of the side edges arranged in pairs are distributed on opposite sides of the lens layer; When the incident light is inclined toward one of the pair of side edges, the other side edge is disposed opposite to the piezoelectric fan.

4. The projection device according to claim 3, characterized in that: The side edges include two first side edges arranged opposite to each other along a first direction and two second side edges arranged opposite to each other along a second direction; the first direction and the second direction are arranged to intersect, and the length of the first side edge is greater than the length of the second side edge; When the incident light is inclined toward one of the two first side edges, the other first side edge is arranged opposite to the piezoelectric fan; or, when the incident light is inclined toward one of the two second side edges, the other second side edge is arranged opposite to the piezoelectric fan.

5. The projection device according to any one of claims 1 to 4, characterized in that: The blade surface of the fan blade is parallel to one side surface of the lens layer along the thickness direction; Alternatively, the blade surface of the fan blade intersects with a side surface of the lens layer along the thickness direction.

6. The projection device according to any one of claims 1 to 4, characterized in that: It also includes an engine casing, and the piezoelectric fan also includes a fixing member, and the piezoelectric member is connected to the engine casing through the fixing member.

7. The projection device according to any one of claims 1 to 4, characterized in that: The piezoelectric fan further comprises a connecting member, and the fan blades are connected to the piezoelectric member via the connecting member; And / or, the piezoelectric element is a piezoelectric ceramic sheet, and a surface of the piezoelectric element extending along the thickness direction is connected to the blade surface of the fan blade.

8. The projection device according to any one of claims 1 to 4, characterized in that: A plurality of the piezoelectric fans are provided, and the plurality of the piezoelectric fans are arranged relatively to a plurality of different side edges in a one-to-one correspondence.

9. A projection device, characterized in that: include: A digital micromirror device for providing a lens layer; A piezoelectric fan, at least part of which is arranged opposite to the circumferential side of the lens layer; The piezoelectric fan is used to provide a piezoelectric component and a fan blade, one end of the fan blade is used to be connected to the piezoelectric component, and the other end is used to extend toward the lens layer; the piezoelectric component is configured to drive the fan blade to vibrate under the drive of voltage to generate an airflow toward the lens layer.

10. A projection system, characterized in that: It comprises a projection screen and the projection device according to any one of claims 1 to 9, wherein the projection device is used to project a projection picture onto the projection screen.

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