Projection device

Abstract

A projection device includes an illumination system, a light valve, a projection lens, and first and second actuation modules. The illumination system is used to provide an illumination beam. The light valve is arranged on the transmission path of the illumination beam to convert the illumination beam into an image beam. The projection lens is arranged on the transmission path of the image beam to project the image beam out of the projection device. The first actuation module is connected to the first element, and the image beam is translated back and forth along at least one of the first direction, the second direction, and the third direction by moving the first element; and the second actuation module is connected to the second element, and the image beam is translated back and forth along at least one of the first direction, the second direction, and the third direction by moving the second element. The first direction and the second direction are perpendicular to each other, the third direction is at a 45-degree angle to the first direction, and the third direction is at a 45-degree angle to the second direction. The first element is different from the second element. The projection device can provide a high-resolution projection image.

Description

Technical Field

[0001] The present invention relates to an optical device that is repeatedly moved, and more particularly to a projection device having the optical device. Background Art

[0002] A projector is a display device used to produce large-scale images. With the evolution and innovation of technology, it continues to advance. The imaging principle of a projector is to convert the illumination beam generated by an illumination system into an image beam through a light valve. This image beam is then projected through a projection lens onto a target object (such as a screen or wall) to form the projected image.

[0003] As the quality of cable TV and internet-streamed videos improves, demand for high-resolution projectors is increasing. To increase projector resolution, actuators are used. These actuators are positioned appropriately within the projector, allowing the projector's light beam to pass through the actuator's optical elements. When the actuator is actuated, the optical element supported by the actuator swings back and forth, redirecting the beam to different locations, thereby increasing the resolution of the projected image. Currently, most actuators on the market are single-axis or dual-axis. Summary of the Invention

[0004] The present invention provides a projection device which can provide a high-resolution projection image and has a small size.

[0005] The present invention provides a projection device, comprising an illumination system, a light valve, a projection lens, a first actuator module, and a second actuator module. The illumination system is configured to provide an illumination beam. The light valve is disposed in the transmission path of the illumination beam and is configured to convert the illumination beam into an image beam. The projection lens is disposed in the transmission path of the image beam and is configured to project the image beam out of the projection device. The first actuator module is connected to the first element in the first group, and by moving the first element, the image beam is caused to translate back and forth along at least one of a first direction, a second direction, and a third direction. The second actuator module is connected to the second element in the second group, and by moving the second element, the image beam is caused to translate back and forth along at least one of the first direction, the second direction, and a third direction, wherein the first direction and the second direction are perpendicular to each other, and the third direction forms a 45-degree angle with the first direction, and the third direction forms a 45-degree angle with the second direction. The first element in the first group is one of the light valve, the flat light-transmitting element, the prism module, and the projection lens. The second element in the second group is one of a light valve, a flat transparent element, a prism module and a projection lens, and the first actuating module and the second actuating module are respectively connected to different elements, and the first element is different from the second element.

[0006] In one embodiment of the present invention, the first actuating module includes a first control element and a first driving element, and the second actuating module includes a second control element and a second driving element.

[0007] In one embodiment of the present invention, the first element in the first group is a light valve, and the second element in the second group is a projection lens. The first actuator module is connected to the light valve, and the light valve is actuated by the first actuator module to move back and forth in a first direction and a second direction. The second actuator module is connected to the projection lens, and the projection lens is actuated by the second actuator module to move back and forth in a third direction.

[0008] In one embodiment of the present invention, the first element in the first group is a light valve, and the second element in the second group is a projection lens. The first actuator module is connected to the light valve, and the light valve is actuated by the first actuator module to move back and forth along the third direction. The second actuator module is connected to the projection lens, and the projection lens is actuated by the second actuator module to move back and forth along the first direction and the second direction.

[0009] In one embodiment of the present invention, the first element in the first group is a light valve, and the second element in the second group is a projection lens. The first actuator module is connected to the light valve, and the light valve is actuated by the first actuator module to move back and forth in a first direction and a second direction. The second actuator module is connected to the projection lens, and the projection lens is actuated by the second actuator module to move back and forth in a first direction and a second direction.

[0010] In one embodiment of the present invention, the first element in the first group is a light valve, and the second element in the second group is a prism module. The first actuator module is connected to the light valve, and the light valve is actuated by the first actuator module to move back and forth in a first direction and a second direction, respectively. The second actuator module is connected to the prism module, and the prism module is actuated by the second actuator module to swing back and forth about a first rotation axis.

[0011] In one embodiment of the present invention, the first element in the first group is a prism module, the second element in the second group is a projection lens, the first actuator module is connected to the prism module, and the prism module is actuated by the first actuator module to swing back and forth about a first rotation axis. The second actuator module is connected to the projection lens, and the projection lens is actuated by the second actuator module to translate back and forth along a first direction and a second direction, respectively.

[0012] In one embodiment of the present invention, the first element in the first group is a light valve, and the second element in the second group is a flat light-transmitting element. The first actuating module is connected to the light valve, and the light valve is actuated by the first actuating module to translate back and forth in a first direction and a second direction. The second actuating module is connected to the flat light-transmitting element, and the flat light-transmitting element is actuated by the second actuating module to swing back and forth about a second rotation axis.

[0013] In one embodiment of the present invention, the first element in the first group is a light valve, and the second element in the second group is a flat light-transmitting element. The first actuating module is connected to the light valve, and the light valve is actuated by the first actuating module to move back and forth in a third direction. The second actuating module is connected to the flat light-transmitting element, and the flat light-transmitting element is actuated by the second actuating module to swing back and forth about a second rotation axis and a third rotation axis, respectively. The second rotation axis is perpendicular to the third rotation axis.

[0014] In one embodiment of the present invention, the first element in the first group is a flat-panel light-transmitting element, and the second element in the second group is a projection lens. The first actuating module is connected to the flat-panel light-transmitting element. The flat-panel light-transmitting element is actuated by the first actuating module to swing back and forth about the second rotation axis and about the third rotation axis. The second actuating module is connected to the projection lens. The projection lens is actuated by the second actuating module to translate back and forth along the third direction.

[0015] In one embodiment of the present invention, the first and second driving elements are voice coil motors, electromagnets, or piezoelectric structures. Based on the above, in the projection device of the present invention, a first actuator module is connected to the first elements in the first group. Movement of the first element causes the image beam to translate back and forth along at least one of a first direction, a second direction, and a third direction. A second actuator module is connected to the second elements in the second group. Movement of the second element causes the image beam to translate back and forth along at least one of a first direction, a second direction, and a third direction. The first direction and the second direction are perpendicular to each other, and the third direction forms a 45-degree angle with the first direction. This allows the projection device to achieve multi-directional actuation by translating the image beam in multiple directions, thereby improving the resolution of the image projected by the projection device onto the projection target. Furthermore, by eliminating the need for actuators capable of translating the beam in multiple directions, the projection device can be reduced in size and cost.

[0016] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1FIG. 4 is a block diagram of a projection device according to an embodiment of the present invention.

[0018] Figure 2 FIG. 1 is a schematic diagram of the operation of a light valve according to an embodiment of the present invention.

[0019] Figure 3 FIG. 4 is a schematic diagram illustrating the operation of a projection lens according to an embodiment of the present invention.

[0020] Figure 4 FIG. 1 is a schematic diagram illustrating the movement of a first element in a first group and the movement of a second element in a second group according to an embodiment of the present invention.

[0021] Figure 5 FIG. 4 is a block diagram of a projection device according to another embodiment of the present invention.

[0022] Figure 6 FIG. 1 is a schematic diagram illustrating the movement of a first element in a first group and the movement of a second element in a second group according to another embodiment of the present invention.

[0023] Figure 7 FIG. 4 is a block diagram of a projection device according to another embodiment of the present invention.

[0024] Figure 8 FIG. 4 is a schematic diagram illustrating the operation of a prism module according to an embodiment of the present invention.

[0025] Figure 9 FIG. 4 is a block diagram of a projection device according to another embodiment of the present invention.

[0026] Figure 10 FIG. 1 is a schematic diagram illustrating the operation of a flat light-transmitting element according to an embodiment of the present invention.

[0027] Figure 11 FIG. 4 is a block diagram of a projection device according to another embodiment of the present invention. DETAILED DESCRIPTION

[0028] Figure 1 This is a block diagram of a projection device according to an embodiment of the present invention. Figure 1 This embodiment provides a projection device 100, comprising an illumination system 110, a light valve 120, a projection lens 130, a first actuator module 140, and a second actuator module 150. The illumination system 110 is configured to provide an illumination beam LB. The light valve 120 is disposed in the transmission path of the illumination beam LB and is configured to convert the illumination beam LB into an image beam LI. The projection lens 130 is disposed in the transmission path of the image beam LI and is configured to project the image beam LI out of the projection device 100 onto a projection target (not shown), such as a screen or a wall. Figure 1The projection device 100 is a non-telecentric projection system. In other embodiments, Figure 1 The projection device 100 may also be a telecentric projection system, in which a prism module 160 is disposed between the light valve 120 and the projection lens 130 on the transmission path of the image light beam LI.

[0029] The lighting system 110 is used to provide an illumination beam LI. For example, in the present embodiment, the lighting system 110 is composed of a plurality of light-emitting elements, a wavelength conversion element, a uniform light element, a filter element, and a plurality of light-splitting and combining elements, and is used to provide light of different wavelengths to form an illumination beam LB. The plurality of light-emitting elements are, for example, light-emitting diodes (LEDs) or laser diodes (LDs). The wavelength conversion element is, for example, a phosphor wheel. The uniform light element is, for example, an integrating rod or a lens array. The filter element is, for example, a color wheel. The light-splitting and combining element is, for example, a dichroic mirror. However, the present invention does not limit the type or form of the lighting system 110 in the projection device 100. Its detailed structure and implementation can be sufficiently taught, suggested, and explained by the common knowledge in the relevant technical field, and therefore will not be described in detail.

[0030] The light valve 120 is, for example, a reflective light modulator such as a Liquid Crystal-on-Silicon (LCoS) panel or a digital micro-mirror device (DMD). In some embodiments, the light valve 120 may also be a transmissive light modulator such as a transparent liquid crystal panel, an electro-optical modulator, a magneto-optical modulator, or an acousto-optic modulator (AOM). The present invention does not limit the type or type of the light valve 120. The detailed steps and implementation of the method by which the light valve 120 converts the illumination light beam LB into the image light beam LI can be adequately taught, suggested, and implemented based on the common knowledge in the art, and thus will not be elaborated upon.

[0031] The projection lens 130, for example, comprises a combination of one or more optical lenses having a refractive power, such as various combinations of non-planar lenses, such as a biconcave lens, a biconvex lens, a meniscus lens, a convex-concave lens, a plano-convex lens, and a plano-concave lens. In one embodiment, the projection lens 130 may also comprise a planar optical lens to reflect the image beam LI from the light valve 130 toward the projection target. The present invention is not limited to the type and form of the projection lens 130.

[0032] Figure 2 FIG. 1 is a schematic diagram of the operation of a light valve according to an embodiment of the present invention. Figure 3 FIG. 4 is a schematic diagram illustrating the operation of a projection lens according to an embodiment of the present invention. Figure 4 Schematic diagram of the movement of the first element in the first group and the movement of the second element in the second group according to an embodiment of the present invention. The movement (moving) described below includes one of shifting and oscillating. Please refer to Figure 1 and Figure 4 . The first actuation module 140 is connected to the first element E1 in the first group G1, and is used to drive the first element E1 to move, so that the first element E1 can translate back and forth along at least one of the first direction D1 and the second direction D2. In other embodiments, the first actuation module 140 is connected to the first element E1 in the first group G1, and is used to drive the first element E1 to move, so that the first element E1 can translate back and forth along the third direction D3. The first direction D1 and the second direction D2 are perpendicular to each other. The first actuation module 140 is connected to the first element E1 in the first group G1, and is used to drive the first element E1 to move, so that the first element E1 can translate back and forth along the third direction D3. The third direction D3 has an angle of 45 degrees with the first direction D1, and the third direction D3 has an angle of 45 degrees with the second direction D2, and the first direction D1, the second direction D2 and the third direction D3 are perpendicular to the light transmission path of the image light beam LI projected by the light valve 120. In other words, the first actuating module 140 is connected to the first element E1 in the first group to drive the first element E1. By moving the first element E1, the image beam LI moves back and forth along the first direction D1 and the second direction D2.

[0033] In this embodiment, the first element E1 in the first group G1 includes, for example, the aforementioned light valve 120. However, in various embodiments, the first group G1 may be a collection of all optical elements in the projection device 100 that can be connected to the first actuating module 140. The first group G1 may include, for example, a light valve, a flat light-transmitting element (e.g., flat glass or flat light-transmitting plastic sheet), a prism module, or a projection lens, as will be described in subsequent sections.

[0034] In this embodiment, the first actuating module 140 includes a first control element 142 and a first driving element 144. The first control element 142 is, for example, a central processing unit (CPU), other programmable general-purpose or special-purpose microprocessor, or other similar elements or a combination of the above elements. The first control element 142 is used to provide a control signal to the first driving element 144. The first driving element 144 is, for example, a voice coil motor, an electromagnet, or a piezoelectric material structure, and is used to make the first element E1 translate or swing according to the control signal. For example, Figure 1 In this embodiment, the first element E1 is a light valve 120, and the light valve 120 is actuated by the first actuating module 140 to move back and forth, so that the image beam LI moves to form a shape as shown below. Figure 2 The displayed image beam LI'. Figure 2 As shown, the image beam LI' is formed by the movement of the light valve 120, which translates back and forth along at least one of the first direction D1 and the second direction D2, or may be formed by the movement of the light valve 120 along the third direction D3. Figure 4 .

[0035] On the other hand, the second actuating module 150 is connected to the second element E2 in the second group G2. When the image beam LI passes through the second element E2, the second actuating module 150 drives the second element E2 to translate back and forth along at least one of the first direction D1 and the second direction D2, or to translate back and forth along the third direction D3. The first actuating module 140 and the second actuating module 150 are connected to different optical elements, meaning that the first element E1 and the second element E2 are different optical elements. In this embodiment, the second group G2 includes, for example, a light valve, a flat transparent element (e.g., flat glass or flat transparent plastic sheet), a prism module, or a projection lens. However, in different embodiments, the second group G2 is a collection of all optical elements in the projection device 100 that can be connected to the second actuating module 150. In this embodiment, the second actuating module 150 includes a second control element 152 and a second driving element 154. The second control element 152 is similar to the first control element 142 and is used to provide a control signal to the second driving element 154. The second driving element 154 is similar to the first driving element 144 and is used to make the second element E2 move or swing according to the control signal. Figure 1 In this embodiment, the second element E2 is a projection lens 130, and the projection lens 130 is actuated by the second actuating module 150 in a manner of back-and-forth translation, so that the light beam passing through is formed as follows: Figure 3 The displayed image beams LI, LI'. Figure 3As shown, the image beam LI' is formed by moving the projection lens 130 back and forth along at least one of the first direction D1 and the second direction D2, or it can also be formed by moving the projection lens 130 back and forth along the third direction D3, as shown in FIG. Figure 4 It is also worth noting that the second actuation module 150 can be connected to the interior of the projection lens 130 to control the back-and-forth translation of one of the lenses in the projection lens 130, but the present invention is not limited to this. The first actuation module 140 is connected to the second actuation module 150 to cooperate with each other to change the optical path of the projected image light beam LI and increase the image resolution.

[0036] For example, in this embodiment, Figure 4 By moving the first element E1, the image beam LI is caused to translate back and forth along the first direction D1 and the second direction D2. By moving the second element E2, the image beam LI is caused to translate back and forth along the third direction D3. In this way, by translating the first and second elements E1 and E2 back and forth in three different directions, the resolution of the image formed by the image beam LI projected by the projection device 100 onto the projection target is improved. Furthermore, by eliminating the need for multiple actuators that previously provided for translating the beam in three different directions, the projection device 100 can be reduced in size and cost.

[0037] Figure 5 FIG. 4 is a block diagram of a projection device according to another embodiment of the present invention. Figure 6 FIG. 1 is a schematic diagram illustrating the movement of a first element in a first group and the movement of a second element in a second group according to another embodiment of the present invention. Figure 8 This is a schematic diagram of the operation of the prism module according to an embodiment of the present invention. Figure 5 、 Figure 6 and Figure 8 The projection device 100A of this embodiment is similar to Figure 1 The projection device 100 shown. The difference between the two is that, in this embodiment, the projection device 100A further includes a prism module 160. On the transmission path of the image light beam LI, the prism module 160 is arranged between the light valve 120 and the projection lens 130. The first actuation module 140 is connected to the prism module 160, and the second actuation module 150 is connected to the projection lens 130. In other words, in this embodiment, the first element E1 is the prism module 160 and the second element E2 is the projection lens 130. The prism module 160 is actuated by the first actuation module 140 in such a manner that it swings back and forth around the first rotation axis A, so that the light beam passing through is formed as follows Figure 8 The projection lens 130 is actuated by the second actuation module 150 to move back and forth, so that the light beam passing through is formed as follows Figure 3The displayed image beams LI, LI'. Figure 3 The displayed image beam LI' is formed by the projection lens 130 moving back and forth along at least one of the first direction D1 and the second direction D2, or can also be formed by the projection lens 130 moving back and forth along the third direction D3, such as Figure 6 In this way, the resolution of the image formed by the image beam LI projected by the projection device 100A onto the projection target can be improved. The first rotation axis A is perpendicular to the path of the image beam LI. The first rotation axis A is perpendicular to the first direction D1 and parallel to the second direction D2.

[0038] Figure 7 FIG. 4 is a block diagram of a projection device according to another embodiment of the present invention. Figure 8 This is a schematic diagram of the operation of the prism module according to an embodiment of the present invention. Figure 7 and Figure 8 The projection device 100B of this embodiment is similar to Figure 1 The difference between the two is that, in this embodiment, the projection device 100B further includes a prism module 160, and the second actuator module 150 is connected to the prism module 160. In other words, in this embodiment, the first actuator module 140 is connected to the first element E1, the first element E1 is the light valve 120, and the second element E2 is the prism module 160. The prism module 160 is actuated by the second actuator module 150 to swing back and forth around the first rotation axis A, so that the light beam passing through is formed as follows: Figure 8 In this way, the first element E1 and the second element E2 can be translated or swung in multiple directions to enable the image beam LI to achieve multi-directional translation, thereby improving the resolution of the image formed by the image beam LI projected by the projection device 100B onto the projection target.

[0039] Figure 9 FIG. 4 is a block diagram of a projection device according to another embodiment of the present invention. Figure 10 This is a schematic diagram of the operation of a flat light-transmitting element according to an embodiment of the present invention. Figure 9 and Figure 10 The projection device 100C of this embodiment is similar to Figure 1The projection device 100 shown in FIG. The difference between the two is that, in this embodiment, the projection device 100C further includes a flat-panel light-transmitting element 170, and the second actuating module 150 is connected to the flat-panel light-transmitting element 170. In other words, in this embodiment, the first actuating module 140 is connected to the light valve 120. The first element E1 is the light valve 120, and the second element E2 is the flat-panel light-transmitting element 170. The flat-panel light-transmitting element 170 is actuated by the second actuating module 150 to swing back and forth around the second rotation axis B, so that the light beam passing through is formed as follows: Figure 10 The displayed image beams LI and LI' are displayed. In this way, by translating and swinging the first element E1 and the second element E2 in multiple different directions, the image beam L1 projected by the projection device 100C can change its optical path, thereby improving the resolution of the image formed by the image beam LI projected by the projection device 100C onto the projection target. In other embodiments, the flat-panel transparent element 170 is actuated by the second actuating module 150 by swinging back and forth about a second rotation axis B and a third rotation axis C (not shown). The second rotation axis B and the third rotation axis C are perpendicular to each other and are both perpendicular to the transmission path of the image beam L1. The second rotation axis B is perpendicular to the first direction D1 and parallel to the second direction D2.

[0040] also, Figure 9 The first actuating module 140 or the second actuating module 150 shown can also be modified to be connected to the projection lens 130, and the present invention is not limited thereto. In other embodiments, Figure 9 The projection device 100C may also be a telecentric projection system, in which a prism module 160 is disposed between the light valve 120 and the flat light-transmitting element 170 on the transmission path of the image light beam LI.

[0041] Figure 11 This is a block diagram of a projection device according to another embodiment of the present invention. Figure 11 The projection device 100D of this embodiment is similar to Figure 7The projection device 100B is shown. The difference between the two is that, in this embodiment, the projection device 100D further includes a flat-panel light-transmitting element 170. In the transmission path of the image light beam LI, a prism module 160 is disposed between the light valve 120 and the projection lens 130, and the flat-panel light-transmitting element 170 is disposed between the prism module 160 and the projection lens 130. The first actuation module 140 is connected to the prism module 160, and the second actuation module 150 is connected to the flat-panel light-transmitting element 170. In other words, in this embodiment, the first element E1 is the prism module 160, and the second element E2 is the flat-panel light-transmitting element 170. The prism module 160 is actuated by the first actuation module 140 to oscillate back and forth, while the flat-panel light-transmitting element 170 is actuated by the second actuation module 150 to oscillate back and forth. In this way, by swinging the first element E1 and the second element E2 in multiple directions, the projected image beam L1 can change the light path to increase the image resolution, thereby improving the resolution of the image formed by the image beam LI projected by the projection device 100D onto the projection target.

[0042] In various embodiments, Figure 11 The first actuator module 140 and the second actuator module 150 shown can also be connected to the flat-panel optical element 170 and the projection lens 130, respectively. For example, the first actuator module 140 is connected to the flat-panel optical element 170, and the second actuator module 150 is connected to the projection lens 130. In other words, the first element E1 represents the flat-panel optical element 170, and the second element E2 represents the projection lens 130. The flat-panel optical element 170 is actuated by the first actuator module 140 to oscillate back and forth, while the projection lens 130 is actuated by the second actuator module 150 to translate back and forth. In this way, by oscillating and translating the first element E1 and the second element E2 in multiple directions, the optical path of the projected image beam L1 can be changed, thereby increasing the resolution of the image formed by the image beam L1 projected by the projection device 100D onto the projection target.

[0043] In addition to all of the above-described embodiments, in some embodiments, the optical components of the first actuating module 140 and the second actuating module 150 can be interchanged based on design and needs, but the present invention is not limited thereto. In various embodiments, the first actuating module 140 and the second actuating module 150 can be interchanged, but the present invention is not limited thereto.

[0044] In all of the above-described embodiments, the first actuating module 140 and the second actuating module 150 are respectively connected to the first element E1 in the first group G1 and the second element E2 in the second group G2. By moving the first group G1 and the second element E2, the resolution of the original image can be increased several times. For example, the resolution of the original image of 2716×1528 can be increased to 7680×4320 (8K), or the resolution of the original image of 1920×1080 can be increased to 7680×4320 (8K).

[0045] However, what is described above is only a preferred embodiment of the present invention, and it should not be used to limit the scope of implementation of the present invention. That is, all simple equivalent changes and modifications made in accordance with the claims and the content of the invention are still within the scope of the patent of the present invention. In addition, any embodiment or claim of the present invention does not need to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract and title (invention name) are only used to assist in the retrieval of patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the name of the element or to distinguish different embodiments or scopes, and are not used to limit the upper or lower limit on the number of elements.

[0046] Description of reference numerals:

[0047] 100, 100A~100D: Projection device

[0048] 110: Lighting system

[0049] 120: Light valve

[0050] 130: Projection lens

[0051] 140: First actuation module

[0052] 142: First control element

[0053] 144: First driving element

[0054] 150,150A: Second actuation module

[0055] 152: Second control element

[0056] 154: Second driving element

[0057] 160: Prism module

[0058] 170: Flat light-transmitting element

[0059] A: First axis

[0060] B: Second axis

[0061] C: The third axis

[0062] D1: First direction

[0063] D2: Second direction

[0064] D3: Third direction

[0065] D4: The fourth direction

[0066] G1: Group 1

[0067] G2: Group 2

[0068] LB: Lighting beam

[0069] LI, LI': image beam.

Claims

1. A projection device, characterized in that: The projection device includes an illumination system, a light valve, a projection lens, a first actuator module, and a second actuator module, wherein: the illumination system is used to provide an illumination beam; the light valve is configured on the transmission path of the illumination beam and is used to convert the illumination beam into an image beam; the projection lens is configured on the transmission path of the image beam and is used to project the image beam out of the projection device; the first actuator module is connected to the first element in the first group, and the image beam is translated back and forth along at least one of the first direction, the second direction, and the third direction by the movement of the first element; and the second actuator module is connected to the second element in the second group, and is used to translate the image beam back and forth along at least one of the first direction, the second direction, and the third direction by the movement of the first element. The movement of the second element causes the image light beam to translate back and forth along at least one of a first direction, a second direction, and a third direction, respectively. The first direction and the second direction are perpendicular to each other, the third direction forms an angle of 45 degrees with the first direction, and the third direction forms an angle of 45 degrees with the second direction. The first element in the first group is one of the light valve, the flat light-transmitting element, the prism module, and the projection lens. The second element in the second group is one of the light valve, the flat light-transmitting element, the prism module, and the projection lens. The first actuating module and the second actuating module are respectively connected to different elements.

2. The projection device according to claim 1, wherein: The first actuating module includes a first control element and a first driving element, and the second actuating module includes a second control element and a second driving element.

3. The projection device according to claim 1, wherein: The first element in the first group is the light valve, and the second element in the second group is the projection lens. The first actuating module is connected to the light valve, and the light valve is actuated by the first actuating module to move back and forth along the first direction and the second direction, respectively. The second actuating module is connected to the projection lens, and the projection lens is actuated by the second actuating module to move back and forth along the third direction.

4. The projection device according to claim 1, wherein: The first element in the first group is the light valve, the second element in the second group is the projection lens, the first actuating module is connected to the light valve, and the light valve is actuated by the first actuating module to move back and forth along the third direction, the second actuating module is connected to the projection lens, and the projection lens is actuated by the second actuating module to move back and forth along the first direction and the second direction, respectively.

5. The projection device according to claim 1, wherein: The first element in the first group is the light valve, and the second element in the second group is the projection lens. The first actuating module is connected to the light valve, and the light valve is actuated by the first actuating module to move back and forth along the first direction and the second direction, respectively. The second actuating module is connected to the projection lens, and the projection lens is actuated by the second actuating module to move back and forth along the first direction and the second direction, respectively.

6. The projection device according to claim 1, wherein: The first element in the first group is the light valve, and the second element in the second group is the prism module. The first actuating module is connected to the light valve, and the light valve is actuated by the first actuating module to move back and forth along the first direction and the second direction respectively. The second actuating module is connected to the prism module, and the prism module is actuated by the second actuating module to swing back and forth around a first rotation axis.

7. The projection device according to claim 1, wherein: The first element in the first group is the prism module, and the second element in the second group is the projection lens. The first actuating module is connected to the prism module, and the prism module is actuated by the first actuating module to swing back and forth around a first rotation axis. The second actuating module is connected to the projection lens, and the projection lens is actuated by the second actuating module to translate back and forth along the first direction and along the second direction respectively.

8. The projection device according to claim 1, wherein: The first elements in the first group are the light valves, and the second elements in the second group are the flat light-transmitting elements. The first actuating module is connected to the light valves, and the light valves are actuated by the first actuating module to translate back and forth along the first direction and the second direction, respectively. The second actuating module is connected to the flat light-transmitting element, and the flat light-transmitting element is actuated by the second actuating module to swing back and forth around a second rotation axis.

9. The projection device according to claim 1, wherein: The first elements in the first group are the light valves, and the second elements in the second group are the flat light-transmitting elements. The first actuating module is connected to the light valves, and the light valves are actuated by the first actuating module to translate back and forth along the third direction. The second actuating module is connected to the flat light-transmitting element, and the flat light-transmitting element is actuated by the second actuating module to swing back and forth around the second rotation axis and around the third rotation axis, respectively.

10. The projection device according to claim 1, wherein: The first element in the first group is the flat-plate light-transmitting element, and the second element in the second group is the projection lens. The first actuating module is connected to the flat-plate light-transmitting element. The flat-plate light-transmitting element is actuated by the first actuating module to swing back and forth around the second rotation axis and around the third rotation axis. The second actuating module is connected to the projection lens. The projection lens is actuated by the second actuating module to translate back and forth along the third direction.

11. The projection device according to claim 2, wherein: The first driving element and the second driving element are voice coil motors, electromagnets or piezoelectric material structures.

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