A projection display system

Abstract

The present application provides a kind of projection display system, comprising: selectively having first transmittance, second transmittance and third transmittance of display unit;Projection screen is overlaid in the rear of the display unit;First projection unit is arranged in the front of the display unit, for projecting first image data to one of the display unit and the projection screen;Second projection unit is arranged in the front of the display unit, for projecting second image data to the display unit;With the display unit, the first projection unit and the second projection unit are coupled, when determining that the second image data is received, control the display unit adjusts to have the second transmittance, and control the second projection unit projects the second image data to the display unit with the second transmittance.The present application can be adjusted transmittance by being located in the front layer of display unit, when needed, can simultaneously project superimposed image, enhance the immersion of watching projection.

Description

Technical Field

[0001] The present invention relates to the field of projectors, and in particular to a display system for superimposed projection. Background Art

[0002] Projection technology is currently widely used in various industries, such as advertising, office meetings, and education. Its popularity stems from its large projection screen size. In education, presentation materials are often used to demonstrate teaching content. When necessary, renowned teachers can be invited to provide live instruction remotely. However, remote teaching often lacks the sense of presence, as the user can only hear the voice without seeing the person. Some programs use video conferencing software to superimpose the remote user's image on the presentation via picture-in-picture, which can obscure the content.

[0003] Therefore, it is necessary to design a novel projection display system to overcome the above-mentioned defects. Summary of the Invention

[0004] The object of the present invention is to provide a projection display system that can superimpose and project multiple image contents in a semi-transparent manner to improve the problem of poor immersiveness in demonstrations.

[0005] To achieve the above object, the present invention provides a projection display system comprising:

[0006] A display unit, which selectively has a first transmittance, a second transmittance, and a third transmittance, wherein the first transmittance, the second transmittance, and the third transmittance increase in sequence; a projection screen, which is stacked behind the display unit; a first projection unit, which is arranged in front of the display unit, and is used to project first image data onto one of the display unit and the projection screen; a second projection unit, which is arranged in front of the display unit, and is used to project second image data onto the display unit; a control processing unit, which is coupled to the display unit, the first projection unit, and the second projection unit; wherein, when the control processing unit determines that the second image data has been received, it controls the display unit to adjust to have the second transmittance, and controls the second projection unit to project the second image data onto the display unit having the second transmittance.

[0007] Preferably, when the control processing unit determines that the second image data is received, the control processing unit further controls the first projection unit to project the first image data onto the projection screen.

[0008] Preferably, the control processing unit controls the display unit to adjust to have the first transmittance and controls the first projection unit to project the first image data to the display unit in case that the control processing unit determines that the second image data is not received.

[0009] Preferably, the control processing unit controls the display unit to adjust to have the third transmittance and controls the first projection unit to project the first image data to the projection screen in case that the control processing unit determines that the second image data is not received.

[0010] Preferably, the projection display system further comprises a remote communication unit configured to receive the second image data from a remote end.

[0011] Preferably, the control processing unit is further configured to superimpose the second image data semi-transparently on the first image data to form a third image data, and the remote communication unit is further configured to transmit the first image data or the third image data to a remote playing device.

[0012] Preferably, the display unit is in an opaque state when the display unit has the first transmittance, the display unit is in a semi-transparent state when the display unit has the second transmittance, and the display unit is in a fully transparent state when the display unit has the third transmittance.

[0013] Preferably, the display unit is a dimmable glass.

[0014] Preferably, the projection screen is a reflective screen, and the projection screen is specifically a soft screen, a hard screen or a whiteboard.

[0015] Preferably, the projection screen is arranged behind the display unit specifically by a preset distance.

[0016] Compared with the prior art, the projection display system provided by the present application can enhance the immersion of watching projection by the double-layer screen structure, by the display unit with adjustable transmittance arranged in the front layer, and by projecting superimposed images without completely shielding the projection content behind. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of a projection display system according to a first embodiment of the present application;

[0018] Figure 2 FIG. 1 is a structural schematic diagram of a projection display system according to a first embodiment of the present application;

[0019] Figure 3 FIG. 2 is a structural schematic diagram of a projection display system according to another embodiment of the present application;

[0020] Figure 4 FIG. 1 shows a schematic diagram of a projection display system according to an embodiment of the present application;

[0021] Figure 5 FIG. 2 shows a schematic diagram of a projection display system according to another embodiment of the present application;

[0022] Figure 6 FIG. 3 shows a schematic diagram of a projection display system according to another embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to more comprehensively understand the object, structure, features and functions of the present application, the following embodiments are provided for further illustration.

[0024] In the description and claims of the application, each of the words "comprise" "include" and the like are to be read in an inclusive sense, that is as "comprising," "including" and the like, so that "comprising," "including" and the like mean "including but not limited to." As used herein, the terms "first," "second" and other such

[0025] Reference Figures 1 to 2 FIG. 1 shows a schematic diagram of a projection display system according to an embodiment of the present application, the projection display system 1 comprising a display unit 10, a projection screen 20, a first projection unit 30, a second projection unit 40 and a control processing unit 50.

[0026] The display unit 10 selectively has a first transmittance tl, a second transmittance t2 and a third transmittance t3, the first transmittance tl, the second transmittance t2 and the third transmittance t3 being sequentially increased (i.e. tl < t2 < t3). In a preferred embodiment, when the display unit 10 has the first transmittance tl, the display unit 10 is in an opaque state (as shown in FIG. 2); when the display unit 10 has the second transmittance t2, the display unit 10 is in a semi-transparent state (as shown in FIG. 3); and when the display unit 10 has the third transmittance t3, the display unit 10 is in a fully transparent state (as shown in FIG. 4). Figure 2 The display unit 10 selectively has a first transmittance tl, a second transmittance t2 and a third transmittance t3, the first transmittance tl, the second transmittance t2 and the third transmittance t3 being sequentially increased (i.e. tl < t2 < t3). In a preferred embodiment, when the display unit 10 has the first transmittance tl, the display unit 10 is in an opaque state (as shown in FIG. 2); when the display unit 10 has the second transmittance t2, the display unit 10 is in a semi-transparent state (as shown in FIG. 3); and when the display unit 10 has the third transmittance t3, the display unit 10 is in a fully transparent state (as shown in FIG. 4). Figure 1 The display unit 10 selectively has a first transmittance tl, a second transmittance t2 and a third transmittance t3, the first transmittance tl, the second transmittance t2 and the third transmittance t3 being sequentially increased (i.e. tl < t2 < t3). In a preferred embodiment, when the display unit 10 has the first transmittance tl, the display unit 10 is in an opaque state (as shown in FIG. 2); when the display unit 10 has the second transmittance t2, the display unit 10 is in a semi-transparent state (as shown in FIG. 3); and when the display unit 10 has the third transmittance t3, the display unit 10 is in a fully transparent state (as shown in FIG. 4). Figure 3The display unit 10 is preferably a light-adjustable glass, which can switch the light transmittance according to the on-off of the power supply, or switch the light transmittance according to the difference of the applied voltage or current. The bearing surface of the display unit 10 can be located on the front side, or on both front and back sides, to protect the internal functional structure. For example, a light-adjustable glass with two glass layers sandwiching a light-adjustable functional layer can be used; or a glass layer with a light-adjustable functional layer adhered to the back side of the glass layer can be used, etc.

[0027] Referring to Figures 1 to 3 The projection screen 20 is arranged behind the display unit 10, in other words, the display unit 10 is in front of the vision, and the projection screen 20 is behind the vision, relative to the conventional viewing angle. When the display unit 10 presents an opaque state or a semi-transparent state, at least part of the projection screen 20 will be blocked by the display unit 10 and cannot be observed by the conventional viewing angle. The projection screen 20 can also be separated from the display unit 10 by a predetermined distance to present a certain depth of field, and to avoid the confusion of images at different depth of field positions, and to enhance the clarity and immersion. The projection screen 20 can be a soft screen, a hard screen, a whiteboard, etc. The display unit 10 can completely cover the front side of the projection screen 20, or can only cover part of the front side of the projection screen 20. In other embodiments, the display unit 10 can also move in front of the projection screen 20 to present different depth of field differences (as shown in Figure 4 The display unit 10 can move by means of, for example, a sliding rail device. In other embodiments, the display unit 10 can also control the light transmittance of the corresponding local blocks of the display unit 10 according to the outline of the image data projected onto the display unit 10, so as to present the local blocks semi-transparent to reflect the image, and the other blocks fully transparent to present the patterns or images behind (as shown in Figure 5 The display unit 10 can move by means of, for example, a sliding rail device. In other embodiments, the display unit 10 can also control the light transmittance of the corresponding local blocks of the display unit 10 according to the outline of the image data projected onto the display unit 10, so as to present the local blocks semi-transparent to reflect the image, and the other blocks fully transparent to present the patterns or images behind (as shown in

[0028] The first projection unit 30 is arranged in front of the display unit 10, and the first projection unit 30 is used to project the first image data S1 to one of the display unit 10 and the projection screen 20. The second projection unit 40 is also arranged in front of the display unit 10, and the second projection unit 40 is used to project the second image data S2 to the display unit 10. The first projection unit 30 and the second projection unit can be independently arranged at different positions, or can be arranged at adjacent positions, or can be two projection units in the same device, without limitation.

[0029] The first projection unit 30 projects to the display unit 10, i.e. focuses to the display unit 10 to form a clear image on the reflective interface formed by the display unit 10. The display unit 10 can form a reflective interface at a lower transmittance, for example, at the first transmittance t1 and the second transmittance t2, the display unit 10 can present a non-transparent or semi-transparent with different transmittance, thereby reflecting the image focused on the display unit 10. The first projection unit 30 can also project to the projection screen 20, at this time, the display unit 10 in front of the projection screen 20 needs to be adjusted to a semi-transparent or completely transparent state, and the first projection unit 30 is focused to the projection screen 20, so that a clear image can be formed on the reflective section formed by the projection screen 20 and reflected to the space within the observable viewing angle range.

[0030] The control processing unit 50 is coupled with the display unit 10, the first projection unit 30 and the second projection unit 40. Referring to Figure 1 , the control processing unit determines to project the second image data S2 to the display unit 10 with the second transmittance t2 when it is determined that the second image data S2 is received. In this way, the image including the second image data S2 and the superimposed image such as the image or pattern presented behind the second image data S2 is presented to the eyes of the person within the observable viewing angle range. Especially when the display unit 10 and the projection screen 20 have a certain interval, the superimposed image with a certain depth can be presented, the perspective effect is good, and the viewing immersion of the viewer is strong.

[0031] Referring to Figure 1In the embodiment, preferably, the control processing unit 50 controls the first projection unit 30 to project the first image data S1 to the projection screen 20 in addition to controlling the first projection unit to project the received second image data S2 to the display unit 10 with the second transmittance t2. Since the display unit 10 is not completely opaque, the first image data S1 can be projected to the rear projection screen 20, and the on-site personnel can also observe the presentation data projected on the rear projection screen 20. Since the display unit 10 is not completely transparent, it can reflect the second image data S2 itself, and finally the second image data S2 is superimposed in front of the first image data S1, and the two have a certain spatial distance, which has a better stereoscopic feeling and immersion. For example, the projection display system 1 is applied to a teaching classroom, the first image data S1 is presentation data, and the second image data S2 is a dynamic image of a person, for example, a real-time image of a teacher is taken by a camera unit at a remote end and transmitted to the projection display system through a network. The projection display system can present the dynamic teacher image in front of the presentation data by controlling and distributing the control processing unit 50 and the projection operation of the second projection unit 40 towards the display unit 10, and "face-to-face" to the students in the teaching classroom. The display unit 10 can also move forward and backward or left and right according to the motion trend of the dynamic teacher image; the display unit 10 can also control the local block of the display unit 10 corresponding to the motion trend direction of the dynamic teacher image to adjust to a semi-transparent state, so that the local block currently presenting the dynamic teacher image and the local block presenting the dynamic teacher image in the future are presented in a semi-transparent state, and the other blocks are adjusted to a fully transparent state.

[0032] Referring to Figure 2 When the control processing unit 50 determines that the second image data S2 is not received, it controls the display unit 10 to adjust to have a defined first transmittance t1, for example, an opaque state, and controls the first projection unit 30 to project the first image data S1 to the display unit 10. At this time, since there is no remote teacher, normal on-site teaching can be carried out.

[0033] Referring to Figure 3 In another embodiment, when the control processing unit 50 determines that the second image data S2 is not received, it controls the display unit 10 to adjust to have a defined third transmittance t3, for example, a fully transparent state, and controls the first projection unit 30 to project the first image data S1 to the projection screen 20. At this time, since there is no remote teacher, normal on-site teaching can be carried out.

[0034] Preferably, Figure 2 and Figure 3In the two embodiments shown, the display unit 10 selects whether to be in the opaque state or the fully transparent state, which can be based on the energy saving of the display unit 10 itself, for example, if the display unit 10 is in a power-off or unpowered state and presents a fully transparent state, it is preferred to use the fully transparent state for normal on-site teaching; otherwise, the opaque state is used for normal on-site teaching. The display unit 10 can also select whether to be in the opaque state or the fully transparent state based on display effects or other needs of the user, and the present application is not limited in this regard.

[0035] With reference to Figure 6 As shown, the projection display system 1 can also include a remote communication unit 60 for receiving second image data S2 from a remote end. The remote communication unit 60 can communicate with the remote device based on at least one communication technology such as mobile communication technology (3G, 5G, etc.), the Internet, a local area network, etc. The remote communication unit 60 can also be used to receive first image data S1 from a remote end. For example, the teacher at the remote end also provides teaching materials, which are transmitted to the local projection display system 1 for projection.

[0036] The control processing unit 50 can be integrated or installed with courseware playing software, video conferencing software, etc., to realize the acquisition of the first image data S1 and the second image data S2 by software and send them to the first projection unit 30 and the second projection unit 40 respectively for projection. The switching between different light transmittances of the display unit 10 can also be performed by a remote controller coupled to the control processing unit 50 to meet different demonstration needs.

[0037] With reference to Figure 6 As shown, in other embodiments, the control processing unit 50 is also used to superimpose the second image data S2 semi-transparently on the first image data S1 to form third image data S3, and transmit the third image data S3 to a remote playing device through the remote communication unit 60, such as an online learning platform located in the Internet, a remote online student device, etc., so that online learning can also obtain the same immersive teaching effect, and the teacher at the remote end can also watch the teaching situation in real time. The control processing unit 50 can also transmit only the first image data S1 to the remote playing device through the remote communication unit 60.

[0038] The projection display system 1 can also include a camera 70 for acquiring the reactions of the on-site viewers, so as to grasp the on-site teaching atmosphere at the remote end, adjust the strategy in time and interact, further improving the interactive and immersive feelings. For example, the teacher at the remote end can acquire the reactions of the students on site, thereby grasping the teaching progress based on the teaching atmosphere, and giving answers in time when the students have questions.

[0039] In summary, the projection display system can select multiple projection modes by the front and rear display units and the projection screen. For example, when the display unit is adjusted to a semi-transparent state, different images can be projected on the display unit and the projection screen at the same time to present image superposition with different depth of field, thereby providing a better demonstration effect with better immersion. When the display unit is adjusted to a fully transparent state or an opaque state, an image data can be projected to achieve a conventional projection demonstration effect. The display unit can also protect the surface of the projection screen.

[0040] The present application has been described by the above-mentioned embodiments, however, the above-mentioned embodiments are only examples for implementing the present application. It must be pointed out that the disclosed embodiments do not limit the scope of the present application. On the contrary, modifications and improvements made without departing from the spirit and scope of the present application are within the scope of the patent protection of the present application.

Claims

1. A projection display system, characterized by comprising: The projection display system comprises: a display unit selectively having a first light transmittance, a second light transmittance and a third light transmittance, the first light transmittance, the second light transmittance and the third light transmittance being sequentially increased; a projection screen stacked behind the display unit; a first projection unit arranged in front of the display unit, the first projection unit being configured to project first image data to one of the display unit and the projection screen; a second projection unit arranged in front of the display unit, the second projection unit being configured to project second image data to the display unit; a control processing unit coupled with the display unit, the first projection unit and the second projection unit; wherein, when it is determined that the second image data is received, the control processing unit controls the display unit to adjust to have the second light transmittance, controls the second projection unit to project the second image data to the display unit having the second light transmittance, and controls the first projection unit to project the first image data to the projection screen, wherein, when the display unit has the second light transmittance, the display unit is in a semi-transparent state for a viewer to superimposedly view the first image data and the second image data.

2. The projection display system of claim 1, wherein, When it is determined that the second image data is not received, the control processing unit controls the display unit to adjust to have the first light transmittance, and controls the first projection unit to project the first image data to the display unit, wherein, when the display unit has the first light transmittance, the display unit is in an opaque state.

3. The projection display system of claim 1, wherein, When it is determined that the second image data is not received, the control processing unit controls the display unit to adjust to have the third light transmittance, and controls the first projection unit to project the first image data to the projection screen, wherein, when the display unit has the third light transmittance, the display unit is in a fully transparent state.

4. The projection display system of claim 1, wherein, The projection display system further comprises a remote communication unit configured to receive the second image data from a remote end.

5. The projection display system of claim 4, wherein, The control processing unit is further configured to superimpose the second image data semi-transparently on the first image data to form third image data, and the remote communication unit is further configured to transmit the third image data to a remote playing device.

6. The projection display system of claim 1, wherein, The display unit is a dimmable glass.

7. The projection display system of claim 1, wherein, The projection screen is a reflective screen, specifically a soft screen, a hard screen or a whiteboard.

8. The projection display system of claim 1, wherein, The projection screen stacked behind the display unit specifically comprises that the projection screen is separated from the display unit by a preset distance. The projection display system further comprises a remote communication unit configured to receive the second image data from a remote end. The control processing unit is further configured to superimpose the second image data semi-transparently on the first image data to form third image data, and the remote communication unit is further configured to transmit the third image data to a remote playing device. The display unit is a dimmable glass. The projection screen is a reflective screen, specifically a soft screen, a hard screen or a whiteboard. The projection screen stacked behind the display unit specifically comprises that the projection screen is separated from the display unit by a preset distance.

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