Projection device and use method thereof

Abstract

The invention provides a projection device. The projection device comprises a ray machine module, a lens module, a sensing module and a control module, the optical-mechanical module is used for providing an image light beam. The lens module is used for projecting the image light beam to a projection target outside the projection device. The lens module comprises a first lens, a second lens and a switching module. The switching module is connected with the first lens and the second lens and used for switching the positions of the first lens and the second lens relative to the optical-mechanical module. The sensing module comprises a first sensing element which is used for sensing the distance between the projection device and a projection target to obtain a distance signal. The control module is used for receiving the distance signal from the first sensing element and controlling the switching module according to the distance signal, so that the switching module switches one of the first lens and the second lens to the transmission path of the image light beam. According to the projection device and the use method thereof, the lens does not need to be manually replaced, the use convenience of the projection device is improved, and the application range of the projection device is expanded.

Description

Technical Field

[0001] The present invention relates to an electronic device, and more particularly to a projection device and a method of using the same. Background Art

[0002] Projection devices are display devices used to produce large-size images. With the evolution and innovation of science and technology, they have been continuously improving. The imaging principle of projection devices is to convert the illumination beam generated by the illumination system into an image beam through a light valve, and then project the image beam onto the projection target (such as a screen or a wall) through a projection lens to form a projection image. In addition, the illumination system has also evolved from ultra-high-performance lamps (UHP lamps) and light-emitting diodes (LEDs) to the most advanced laser diode (LD) light sources, and even packaged light sources formed by all-in-one laser diodes have been introduced to make the internal configuration of the projection device more compact and the optical performance better.

[0003] However, in current projection devices, the projection lenses are all fixedly installed, so they can only be used in a single way after installation. Therefore, if they are limited by site environment factors, they will not be widely used.

[0004] The "background technology" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "background technology" section may contain some prior art that is not known to those skilled in the art. The content disclosed in the "background technology" section does not mean that the content or the problem to be solved by one or more embodiments of the present invention has been known or recognized by those skilled in the art before the application of the present invention. Summary of the invention

[0005] The present invention provides a projection device and a method for using the same, which can eliminate the need for manual lens replacement, improve the use convenience of the projection device and expand its application range.

[0006] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0007] To achieve one or part or all of the above purposes or other purposes, the present invention provides a projection device, which includes an optical engine module, a lens module, a sensing module, and a control module. The optical engine module is used to provide an image light beam. The lens module is disposed on the transmission path of the image light beam and is used to project the image light beam onto a projection target outside the projection device. The lens module includes a first lens, a second lens, and a switching module. The switching module is connected to the first lens and the second lens and is used to switch the positions of the first lens and the second lens relative to the optical engine module. The sensing module includes a first sensing element. The first sensing element is used to sense the distance between the projection device and the projection target to obtain a distance signal. The control module is electrically connected to the sensing module and the switching module. The control module is used to receive the distance signal from the first sensing element and control the switching module according to the distance signal, so that the switching module switches one of the first lens and the second lens to the transmission path of the image light beam.

[0008] To achieve one or part or all of the above purposes or other purposes, the present invention further provides a method for using a projection device, and its steps include: projecting an image light beam onto a projection target; sensing the distance between the projection device and the projection target to obtain a distance signal; and controlling the switching module according to the distance signal, so that the switching module switches one of the first lens and the second lens to the transmission path of the image light beam.

[0009] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the projection device and its using method of the present invention, the projection device includes an optical engine module, a lens module, a sensing module, and a control module. The lens module includes a first lens, a second lens, and a switching module, and the switching module is connected to the first lens and the second lens and is used to switch the positions of the first lens and the second lens relative to the optical engine module. Therefore, by sensing the distance between the projection device and the projection target, the switching module can be controlled according to the generated distance signal, so that the switching module switches one of the first lens and the second lens to the transmission path of the image light beam. In this way, by installing the first lens and the second lens with different optical conditions in the same projection device and switching to use a suitable lens according to the change in the distance between the projection device and the projection target, it is possible to avoid manually replacing the lens, and improve the convenience of using the projection device and expand its application range.

[0010] To make the above features and advantages of the present invention more obvious and understandable, the following specific embodiments are given and described in detail in conjunction with the accompanying views as follows. Description of the Drawings

[0011] Figure 1A and Figure 1B are respectively the block diagram and the structural diagram of the projection device of an embodiment of the present invention when using the first lens.

[0012] Figure 2A and Figure 2B are respectively the block diagram and the structural diagram of the projection device according to an embodiment of the present invention when using the second lens.

[0013] Figure 3 is the projection schematic diagram of the first lens and the second lens according to an embodiment of the present invention.

[0014] Figure 4 is the block diagram of the projection device according to another embodiment of the present invention.

[0015] Figure 5 is the block diagram of the projection device according to another embodiment of the present invention.

[0016] Figure 6 is the flowchart of the steps of the using method of the projection device according to an embodiment of the present invention. Detailed Description of the Invention

[0017] The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the accompanying views. The directional terms (such as: up, down, left, right, front or back, etc.) mentioned in the following embodiments are only with reference to the directions of the attached views. Therefore, the directional terms used are for illustration and not for limiting the present invention.

[0018] Figure 1A and Figure 1B are respectively the block diagram and the structural diagram of the projection device according to an embodiment of the present invention when using the first lens. Please refer to Figure 1A and Figure 1B . This embodiment provides a projection device 100, which includes an optical engine module 110, a lens module 120, a sensing module 130, and a control module 140. Among them, the optical engine module 110 is used to provide an image beam L, and the lens module 120 is disposed on the transmission path of the image beam L to project the image beam L onto a projection target T (such as a screen or a wall) outside the projection device 100.

[0019] The optical engine module 110 is, for example, a combination of an illumination system, a plurality of light transmission elements, at least one light valve, and a plurality of different types of optical elements. The illumination system is, for example, composed of at least one or more light-emitting elements, a wavelength conversion element, a light homogenizing element, a light filtering element, and a plurality of light combining and splitting elements. In other embodiments, the illumination system is, for example, composed of a plurality of light-emitting elements for emitting light of different wavelengths and a plurality of light combining and splitting elements. The illumination system is used to provide and output light of different wavelengths to form an illumination beam. However, the present invention does not limit the type and kind of the illumination system. The light valve is, for example, a reflective light modulator such as a Liquid Crystal On Silicon panel (LCoS panel), a Digital Micro-mirror Device (DMD), etc. In some embodiments, the light valve can also be a transmissive light modulator such as a Transparent Liquid Crystal Panel, an Electro-Optical Modulator, a Magneto-Optic modulator, an Acousto-Optic Modulator (AOM), etc. The present invention does not limit the type and kind of the light valve. The method for the illumination system to provide an illumination beam to the light valve to be converted into an image beam L, the detailed steps and implementation manners of which can be sufficiently taught, suggested, and illustrated by the common general knowledge in the art, will not be described in detail herein.

[0020] Figure 2A and Figure 2B are respectively a block diagram and a structural diagram of a projection device according to an embodiment of the present invention when using a second lens. Figure 3 is a projection diagram of a first lens and a second lens according to an embodiment of the present invention. Please first refer to Figure 1A , Figure 2A and Figure 3 . The lens module 120 includes a first lens 122, a second lens 124, and a switching module 126. In this embodiment, the projection ratio of the first lens 122 is greater than 0.3, and the projection ratio of the second lens 124 is less than 0.3, but the present invention is not limited thereto. In other words, the outgoing light angle A1 of the image beam L with respect to the first lens 122 is different from the outgoing light angle A2 of the image beam L with respect to the second lens 124. For example, the first lens 122 is, for example, a telephoto lens composed of 2 to 6 lenses, and is used to provide a large-size display image to the projection target T. The second lens 124 is, for example, an ultra-short focal length lens composed of 12 to 16 lenses, and is used for projecting a small space with a short length or projecting towards the ground, such as Figure 3As shown, it can be further combined with intelligent products (such as robots) and used in public spaces (such as enterprise companies, shopping malls or restaurants) to achieve the effect of mobile projection. Among them, the first projection path L1 is the path of the image light beam L projected by the first lens 122, and the second projection path L2 is the path of the image light beam L projected by the second lens 124. Therefore, in this embodiment, the light-emitting angle A1 of the image light beam L at the first lens 122 is smaller than the light-emitting angle A2 of the image light beam L at the second lens 124.

[0021] Please refer to Figure 1B and Figure 2B . The switching module 126 is connected to the first lens 122 and the second lens 124 for switching the positions of the first lens 122 and the second lens 124 relative to the optical engine module 110. For example, the switching module 126 includes mechanism elements such as a driving element 302 (such as a motor), a screw 304, a slide bar 306, a sliding bearing 308, and a clamping and carrying platform 310. Among them, the driving element 302 is connected to the screw 304 for driving the screw 304 to push at least one sliding bearing 308 sleeved on the slide bar 306. The plurality of sliding bearings 308 have an interlocking relationship with each other, so that the plurality of sliding bearings 308 can move along the extending direction of the slide bar 306. Among them, at least one sliding bearing 308 is connected to the clamping and carrying platform 310. By the movement of the plurality of sliding bearings 308, the clamping and carrying platform 310 can move along the extending direction of the slide bar 306. The clamping and carrying platform 310 is used to carry the first lens 122 and the second lens 124. The first lens 122 and the second lens 124 are arranged along the switching direction D. The switching direction D is perpendicular to the direction in which the image light beam L is incident on the lens module 120, and the switching direction D is parallel to the extending direction of the slide bar 306. Specifically, when the first lens 122 and the second lens 124 are switched, the driving element 302 in the switching module 126 drives the clamping and carrying platform 310 to move the first lens 122 and the second lens 124 along the switching direction D. Therefore, when using the first lens 122 to project the image light beam L, the first lens 122 is located on the transmission path of the image light beam L from the optical engine module 110, and the path of the image light beam L is the first projection path L1 as shown in Figure 3 . The second lens 124 is not located on the transmission path of the image light beam L from the optical engine module 110. Therefore, the first lens 122 is closer to the optical engine module 110 at this time. When using the second lens 124 to project the image light beam L, the second lens 124 is located on the transmission path of the image light beam L from the optical engine module 110, and the path of the image light beam L is the same as that shown in Figure 3For the second projection path L2 shown, the first lens 122 is not located on the transmission path of the image light beam L from the optical engine module 110. Therefore, at this time, the second lens 124 is relatively close to the optical engine module 110. However, the present invention does not limit the type or form of the switching module 126. Sufficient teachings, suggestions, and implementation descriptions regarding its detailed structure and implementation manner can be obtained from the common general knowledge in the art, and thus will not be elaborated further.

[0022] The sensing module 130 includes a first sensing element 132. The first sensing element 132 can be a distance measuring sensor (for example, a Time of Flight (ToF) sensor), which is used to sense the distance between the projection device 100 and the projection target T to obtain a distance signal S1. The control module 140 is electrically connected to the sensing module 130 and the switching module 126 in the lens module 120. For example, the control module 140 includes at least one controller or processor (such as a microcontroller unit (MCU)), which is used to receive the distance signal S1 from the first sensing element 132 and control the switching module 126 according to the distance signal S1, so that the switching module 126 switches one of the first lens 122 and the second lens 124 to the transmission path of the image light beam L. In this way, by installing the first lens 122 and the second lens 124 with different optical conditions in the same projection device 100 and switching to use the appropriate lens according to the distance change between the projection device 100 and the projection target T, it is possible to avoid manually replacing the lens, and improve the usability of the projection device 100 and expand its application range.

[0023] Figure 4 It is a block diagram of a projection device according to another embodiment of the present invention. Please refer to Figure 4 This embodiment of the projection device 100A is similar to Figure 1AThe projection device 100 shown. The difference between the two is that in this embodiment, the sensing module 130A further includes a second sensing element 134, which is electrically connected to the control module 140A. The second sensing element 134 is, for example, a camera, which is used to sense the image formed after the image light beam L is projected onto the projection target T to obtain an image sensing signal S2. And the control module 140A is used to adjust the focal length of the first lens 122 or the second lens 124 according to the image sensing signal S2. Specifically, in this embodiment, the control module 140A further includes a controller 142 (such as a microcontroller unit (MCU)), which is used to receive the image sensing signal S2 from the second sensing element 134 and confirm the type of lens located on the transmission path of the image light beam L (that is, the first lens 122 or the second lens 124) according to the distance signal S1. After the controller 142 confirms the type of lens located on the transmission path of the image light beam L, it selects the focus table corresponding to the lens type, generates a focal length adjustment signal S3 according to the image sensing signal S2 and the focus table, and transmits the focal length adjustment signal S3 to the lens module 120. The lens module 120 adjusts the focal length of the first lens 122 or the second lens 124 according to the focal length adjustment signal S3, for example, by driving elements such as motors for adjustment. For example, in this embodiment, the control module 140A further includes a storage unit 144, which is communicatively connected to the controller 142 and is used to store the focus tables corresponding to the first lens 122 and the second lens 124. The storage unit 144 can be a hard disk or a random access memory, and the present invention is not limited thereto. However, in another embodiment, the focus tables of different lens types can also be directly stored in the controller 142, and the present invention is not limited thereto. In this way, the effect of automatic focusing can be achieved.

[0024] Figure 5 is a block diagram of a projection device according to another embodiment of the present invention. Please refer to Figure 5 . The projection device 100B of this embodiment is similar to Figure 4The projection device 100A shown. The difference between the two is that in this embodiment, the sensing module 130B further includes a third sensing element 136, which is electrically connected to the control module 140B. The third sensing element 136 is, for example, a gravity sensor (G-sensor) or a combination of a camera and a gravity sensor. The third sensing element 136 is used to sense the position of the projection device 100B to obtain a position signal S4 (such as the tilt angle of the projection device 100B). The control module 140B is used to generate a correction compensation signal S5 according to the position signal S4 and transmit it to the optical engine module 110, so that the optical engine module 110 adjusts the image beam L according to the correction compensation signal S5 to correct the shape of the image formed after the image beam L is projected onto the projection target T. Specifically, the control module 140B includes a controller 142 and a video processor 146. The controller 142 is used to receive the position signal S4 from the third sensing element 136, and confirm the type of lens on the transmission path (i.e., the first lens 122 or the second lens 124) according to the distance signal S1, and select a trapezoidal correction table corresponding to the lens type. The video processor 136 is used to receive the position signal S4 and the trapezoidal correction table from the controller 142, generate a correction compensation signal S5 according to the position signal S4 and the trapezoidal correction table, and transmit the correction compensation signal S5 to the optical engine module 110. Alternatively, in another embodiment, the controller 142 is used to confirm the type of lens on the transmission path according to the distance signal S1 and select a trapezoidal correction table corresponding to the lens type. The video processor 146 is used to receive the position signal S4 from the third sensing element 136 and the trapezoidal correction table from the controller 142, generate a correction compensation signal S5 according to the position signal S4 and the trapezoidal correction table, and transmit the correction compensation signal S5 to the optical engine module 110. In addition, in any of the above embodiments, the control module 140B further includes a storage unit 144. The storage unit 144 can be a hard disk or a random access memory, and the present invention does not limit this. The storage unit 144 is communicatively connected to the controller 142. The storage unit 144 is used to store the trapezoidal correction tables corresponding to the first lens 122 and the second lens 124.

[0025] Figure 6 is a flowchart of the steps of the usage method of the projection device according to an embodiment of the present invention. Please refer to Figure 6 . This embodiment provides a usage method of a projection device 100, which can be applied to at least any of the above embodiments. The following description is made by applying it to Figure 1ATake the projection device 100 shown as an example. First, perform step S200 to project the image light beam L onto the projection target T. Next, after the above step, perform step S201 to sense the distance between the projection device 100 and the projection target T to obtain the distance signal S1. Finally, perform step S202 to control the switching module 126 according to the distance signal S1, so that the switching module 126 switches one of the first lens 122 and the second lens 124 to the transmission path of the image light beam L. In addition, the method of controlling the switching module 126 to move the first lens 122 and the second lens 124, the autofocus of the first lens 122 and the second lens 124, and the trapezoidal correction method for correcting the image formed after the image light beam L is projected onto the projection target T are as described above and will not be elaborated here.

[0026] In summary, the projection device and its usage method according to the embodiments of the present invention have at least one of the following advantages: In the projection device and its usage method of the present invention, the projection device includes an optical engine module, a lens module, a sensing module, and a control module. The lens module includes a first lens, a second lens, and a switching module, and the switching module is connected to the first lens and the second lens to switch the positions of the first lens and the second lens relative to the optical engine module. Therefore, by sensing the distance between the projection device and the projection target, the switching module can be controlled according to the generated distance signal, so that the switching module switches one of the first lens and the second lens to the transmission path of the image light beam. In this way, by installing the first lens and the second lens with different optical conditions in the same projection device and switching to use the appropriate lens according to the distance change between the projection device and the projection target, it is possible to avoid manually replacing the lens, improve the convenience of using the projection device, and expand its application range.

[0027] The above are only the preferred embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. That is, all simple equivalent changes and modifications made in accordance with the claims of the present invention and the specification of the present invention are still within the scope covered by the patent of the present invention. In addition, any embodiment or claim of the present invention does not have to achieve all the purposes, advantages, or features disclosed by the present invention. In addition, the abstract of the specification and the title of the invention 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 the specification or claims are only used to name the elements or distinguish different embodiments or scopes, and are not used to limit the upper or lower limits of the number of elements.

Claims

1. A projection device, characterized in that, The projection device includes an optical engine module, a lens module, a sensing module, and a control module, where: The optical engine module is used to provide an image light beam; The lens module is disposed on the transmission path of the image light beam and is used to project the image light beam onto a projection target outside the projection device. The lens module includes a first lens, a second lens, and a switching module. The switching module is connected to the first lens and the second lens and is used to switch the positions of the first lens and the second lens relative to the optical engine module; The sensing module includes a first sensing element, and the first sensing element is used to sense the distance between the projection device and the projection target to obtain a distance signal; and The control module is electrically connected to the sensing module and the switching module. The control module is used to receive the distance signal from the first sensing element and control the switching module according to the distance signal, so that the switching module switches one of the first lens and the second lens to the transmission path of the image light beam.

2. The projection device according to claim 1, characterized in that, The projection ratio of the first lens is greater than 0.3, and the projection ratio of the second lens is less than 0.

3.

3. The projection device according to claim 1, wherein The light output angle of the image light beam through the first lens is different from the light output angle of the image light beam through the second lens.

4. The projection device according to claim 1, wherein When the first lens and the second lens are switched, the switching module moves the first lens and the second lens along the switching direction, and the switching direction is perpendicular to the direction in which the image light beam enters the lens module.

5. The projection device according to claim 1, wherein, The sensing module further includes a second sensing element. The second sensing element is electrically connected to the control module. The second sensing element is used to sense the image formed after the image light beam is projected onto the projection target to obtain an image sensing signal. The control module is further used to adjust the focal length of the first lens or the second lens according to the image sensing signal.

6. The projection device according to claim 5, characterized in that, The control module includes a controller. The controller is used to receive the image sensing signal from the second sensing element, confirm the type of lens on the transmission path according to the distance signal, select a focus adjustment table corresponding to the type of lens, generate a focal length adjustment signal according to the image sensing signal and the focus adjustment table, and transmit the focal length adjustment signal to the lens module. The lens module adjusts the focal length of the first lens or the second lens according to the focal length adjustment signal.

7. The projection device according to claim 6, characterized in that, The control module further includes a storage unit. The storage unit is communicatively connected to the controller. The storage unit is used to store the focus adjustment tables corresponding to the first lens and the second lens.

8. The projection device according to claim 1, wherein The sensing module further includes a third sensing element. The third sensing element is electrically connected to the control module. The third sensing element is used to sense the position of the projection device to obtain a position signal. The control module is further used to generate a correction compensation signal according to the position signal and transmit it to the optical engine module, so that the optical engine module adjusts the image light beam according to the correction compensation signal to correct the shape of the image formed after the image light beam is projected onto the projection target.

9. The projection device according to claim 8, wherein The control module includes a controller and a video processor, wherein, the controller is configured to receive the position signal from the third sensing element, confirm the type of lens on the transmission path according to the distance signal, and select a trapezoidal correction table corresponding to the type of lens. the video processor is configured to receive the position signal and the trapezoidal correction table from the controller, generate a correction compensation signal according to the position signal and the trapezoidal correction table, and transmit the correction compensation signal to the optical engine module.

10. The projection device according to claim 8, wherein The control module includes a controller and a video processor, wherein, the controller is configured to confirm the type of lens on the transmission path according to the distance signal, and select a trapezoidal correction table corresponding to the type of lens. the video processor is configured to receive the position signal from the third sensing element and the trapezoidal correction table from the controller, generate a correction compensation signal according to the position signal and the trapezoidal correction table, and transmit the correction compensation signal to the optical engine module.

11. The projection device according to claim 9 or 10, characterized in that, The control module further includes a storage unit, the storage unit is communicatively connected to the controller, and the storage unit is configured to store the trapezoidal correction tables corresponding to the first lens and the second lens.

12. A method for using a projection device, characterized in that, The projection device is the projection device according to claim 1, and the usage method includes the following steps: Project the image light beam onto the projection target; Sense the distance between the projection device and the projection target to obtain the distance signal; and Control the switching module according to the distance signal, so that the switching module switches one of the first lens and the second lens to the transmission path of the image light beam.

13. The method for using a projection device according to claim 12, wherein, The method of controlling the switching module according to the distance signal to switch one of the first lens and the second lens to the transmission path of the image light beam further includes: Move the first lens and the second lens along the switching direction, and the switching direction is perpendicular to the direction in which the image light beam is incident on the lens module.

14. The method for using a projection device according to claim 12, characterized in that, The usage method further includes: Sense the image formed after the image light beam is projected onto the projection target to obtain an image sensing signal; and Adjust the focal length of the first lens or the second lens according to the image sensing signal.

15. The method of using a projection device according to claim 14, wherein The method of adjusting the focal length of the first lens or the second lens according to the image sensing signal further includes: Confirm the type of lens on the transmission path according to the distance signal, select a focusing table corresponding to the type of lens, generate a focusing adjustment signal according to the image sensing signal and the focusing table, and adjust the focal length of the first lens or the second lens according to the focusing adjustment signal.

16. The method for using a projection device according to claim 12, wherein The usage method further includes: Sense the position of the projection device to obtain a position signal; and Generate a correction compensation signal according to the position signal, and adjust the image light beam according to the correction compensation signal to correct the shape of the image formed after the image light beam is projected onto the projection target.

17. The method for using a projection device according to claim 16, wherein The method of generating a correction compensation signal according to the position signal further includes: Based on the distance signal, confirm the type of lens on the transmission path, select a trapezoidal correction table corresponding to the type of lens, and generate the correction compensation signal according to the position signal and the trapezoidal correction table.

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