Double-face switching projection display device and display face switching method thereof

Abstract

The invention discloses a double-face switching projection display device and a display face switching method thereof. The double-face switching projection display device comprises a display piece and a switching device. One side of the display piece is a display direction, and a projection device is arranged in the display direction; the display piece has front and back surfaces; the front surface is a projection surface, and when the projection surface faces the display direction, a picture projected by the projection device can be displayed; the back face is a drawing face, drawing content is arranged on the drawing face, and when the drawing face faces the display direction, the drawn content is directly displayed; the switching device can switch the orientation of the display piece, so that the projection surface or the drawing surface faces the display direction. A picture is drawn on the reverse side of the projection curtain, the front side of the projection curtain faces outwards at night to display the projection picture, and the reverse side of the projection curtain is switched to face outwards at daytime to display the drawn picture.

Description

Technical Field

[0001] This invention relates to the field of projection display technology, and in particular to a dual-sided switching projection display device and a method for switching the display surface. Background Technology

[0002] Currently, there are inland waterway advertising vessels equipped with LED screens that play commercials or city promotional videos. However, LED screens cause light pollution at night, potentially interfering with waterway safety and affecting residents along the river. Some regions also have strict regulations regarding the brightness and playback times of ship advertising screens. To address this, an alternative solution has emerged: installing a screen on the ship and projecting the image onto it using a projector. Compared to LED screens, projectors have lower brightness and do not cause severe light pollution at night, complying with local policies. However, due to the lower brightness, the projected image is difficult to see during the day, making daytime advertising challenging. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a dual-sided switching projection display device and a method for switching the display surface. The image is drawn on the reverse side of the projection screen. At night, the front side of the projection screen faces outward to display the projected image. During the day, the projection screen is switched to face outward to display the drawn image.

[0004] Technical Solution: To achieve the above objectives, the present invention provides a dual-sided switching projection display device, comprising a display component and a switching device; one side of the display component is the display direction, and a projection device is located in the display direction; the display component has two sides, front and back; the front side is the projection surface, and when the projection surface faces the display direction, it can display the image projected by the projection device; the back side is the drawing surface, and the drawing surface has drawn content, and when the drawing surface faces the display direction, it directly displays the drawn content; the switching device can switch the orientation of the display component so that the projection surface or the drawing surface faces the display direction.

[0005] Furthermore, the display component is a flexible structural component; the switching device includes two movable frames, with both sides of the display component connected to the two movable frames respectively; after the two movable frames move towards each other and intersect, the orientation of the display component is switched.

[0006] Furthermore, the switching device also includes a tensioning mechanism that can tighten the flexible display piece during the displacement of the two movable frames.

[0007] Furthermore, the switching device also includes two parallel outer guide rails, and two movable frames slide along the two outer guide rails respectively; when the two movable frames move away from each other and flatten the display piece, if the projection surface faces the display direction, the display piece is in a front display state, and if the drawing surface faces the display direction, the display piece is in a back display state; the two outer guide rails are spaced apart, and there is an angle difference between the front display state and the back display state of the display piece.

[0008] Furthermore, the tensioning mechanism includes a tensioning roller; there is an intermediate guide rail between the two outer guide rails, and the tensioning roller can slide along the intermediate guide rail; during the displacement of the two movable frames, the tensioning roller abuts against the display piece and tensions the display piece.

[0009] Furthermore, the outer diameter of the tension roller is exactly equal to the minimum distance between the two movable frames. The side of the movable frame facing the opposite outer guide rail is the mounting side, and the display piece is connected to the mounting side of the movable frame. When the display piece is in the display state or projection state, the tension roller is pressed against one of the movable frames, so that one side of the display piece passes around the tension roller before connecting to the movable frame, thereby eliminating the angle difference between the front and back display states of the display piece.

[0010] Furthermore, the tensioning roller is located on the side where the projection surface of the display piece is located.

[0011] Furthermore, the tensioning roller is a rotating structural component, and the tensioning roller makes rolling contact with the display component.

[0012] Furthermore, the display piece has a ventilation structure.

[0013] Furthermore, a method for switching the display surface of a dual-sided switching projection display device includes two movable frames, A and B. Initially, the A and B frames are moved away from each other and the display piece is flattened. A tension roller is attached to the A frame, and one side of the display piece passes over the tension roller and connects to the A frame. When it is necessary to switch the orientation of the display piece, the steps are as follows: S1: The B frame remains stationary, and the tension roller and the A frame simultaneously move towards the B frame, keeping the display piece taut during the movement until the A frame approaches the B frame; S2: The A frame remains stationary, and the tension roller and the B frame simultaneously move away from the A frame, keeping the display piece taut during the movement until the A and B frames flatten the display piece again, and the tension roller is attached to the B frame, with one side of the display piece passing over the tension roller and connecting to the B frame.

[0014] Beneficial Effects: The beneficial effects of the dual-sided switching projection display device and its display surface switching method of the present invention are as follows:

[0015] 1) The orientation of the display piece is switched by a switching device. At night, the projection surface of the display piece faces the display direction to show the image projected by the projector; during the day, the drawing surface of the display piece faces the display direction to directly show the drawn content.

[0016] 2) It is equipped with a tensioning roller, which can tighten the display items to prevent them from wrinkling or even being damaged. In addition, the tensioning roller can also eliminate the angle difference between the front and back display items. Before and after switching, the front and back of the display items can face the display direction. Attached Figure Description

[0017] Appendix Figure 1 This is a schematic diagram showing the components and switching device on the hull.

[0018] Appendix Figure 2 A diagram showing the steps to switch the orientation of a display piece. Detailed Implementation

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] As attached Figures 1 to 2 A dual-sided switching projection display device includes a display component 1 and a switching device 2. One side of the display component 1 is the display direction, and a projection device 3 is located in the display direction. The display component 1 has two sides, front and back. The front side of the display component 1 is the projection surface. When the projection surface faces the display direction, if the projection device 3 projects onto the projection surface of the display component 1, the projection surface can display the image projected by the projection device 3. The back side of the display component 1 is the drawing surface, which contains drawn content. When the drawing surface faces the display direction, the drawn content is directly displayed. The drawn content can be a pattern or text, and can be hand-drawn or machine-printed. However, due to the presence of the drawn content, if the projection device 3 projects onto the drawing surface, the projected image will overlap with the drawn content, failing to achieve a normal display function. The projection surface of the display component 1 is generally white or light gray and has no pattern, thus it can normally display the image projected by the projection device 3.

[0021] Due to the inherent characteristics of projection, the human eye can clearly see the projected image at night, but during the day, the projected image is difficult to see due to insufficient brightness, resulting in a poor display effect. Therefore, in this invention, a switching device 2 is provided, which can switch the orientation of the display component 1 so that the drawing surface or projection surface of the display component 1 faces the display direction.

[0022] As attached Figure 1In one embodiment shown, the display component 1 is positioned on one side of the hull 8, which is navigating on an inland waterway. The side of the display component 1 facing outwards from the hull 8 can be used for commercial advertising or cultural tourism promotion. The other side of the display component 1, facing the hull 8 itself, is obstructed by the hull 8, thus failing to achieve the desired promotional effect. Therefore, at night, the projection surface of the display component 1 faces outwards from the hull 8, and the projection device 3 projects an image onto this surface for commercial advertising or cultural tourism promotion. During the day, the painted surface of the display component 1 faces outwards, directly displaying the painted content, such as an advertisement, thus achieving daytime promotional effects. When the projection surface of the display component 1 faces outwards from the hull 8, the projection device 3 needs to project onto the display component 1 from outside the hull 8. Therefore, the projection device 3 is connected to the hull 8 via a telescopic frame. When projection is needed, the telescopic frame extends, allowing the projection device 3 to extend outside the hull 8, projecting onto the display component 1. When projection is not needed, the projection device 3 can be retracted back onto the hull 8.

[0023] Of course, the projection display device of the present invention is not limited to use on ships, but can also be used on vehicles or other scenarios that require display and promotion.

[0024] In one embodiment, the display component 1 is a rigid structural member, such as a display board, with one side printed with advertisements and the other side without advertisements, and can be used as a screen. The switching device 2 is a flipping mechanism that changes the orientation of the display board by flipping it. However, if the display component 1 is a rigid structural member, the space required for switching the front and back of the display component 1 is large, while the space on the hull 8 is limited. Therefore, the rigid display component 1 has a low degree of compatibility with the ship.

[0025] In another embodiment, the display element 1 is a flexible structural component, such as a curtain, with an advertisement printed on its back. The switching device 2 includes two movable frames 4, with the two sides of the display element 1 connected to the two movable frames 4 respectively, typically the top and bottom or left and right sides of the display element 1. When the two movable frames 4 move towards each other and intersect, the orientation of the display element 1 changes. When the display element 1 is flexible, the space required for switching between the front and back is smaller, resulting in a higher degree of adaptability to ships.

[0026] The hull 8 is also equipped with a tensioning mechanism, which can tighten the flexible display piece 1 during the displacement of the two movable frames 4. If the display piece 1 is not tightened, its shape cannot be controlled during the displacement of the movable frames 4, which can easily cause wrinkles or even damage to the display piece 1. In one embodiment, the tensioning mechanism is a winch installed on the movable frame 4. During the displacement of the movable frame 4, the winch can correspondingly wind up or release the display piece 1, thereby keeping the display piece 1 taut.

[0027] The switching device 2 also includes two parallel outer guide rails 5, and two movable frames 4 slide along the two outer guide rails 5 respectively; when the two movable frames 4 move away from each other and flatten the display piece 1, if the projection surface faces the display direction, the display piece 1 is in the front display state, and if the drawing surface faces the display direction, the display piece 1 is in the reverse display state.

[0028] The two outer guide rails 5 are spaced apart. Display piece 1 is not directly facing the display direction in either the front or back display state; instead, it is tilted at a certain angle. Therefore, there is an angle difference between the front and back display states. For example, when the hull 8 is sailing on an inland river, display piece 1, installed on the side of the hull 8, faces the riverbank. When display piece 1 is parallel to the riverbank, people on the riverbank can see it directly. When people see it directly, the promotional image or pattern will not be distorted or misrepresented, thus achieving the best promotional effect. However, because there is an angle difference between the front and back display states, it is impossible to ensure that display piece 1 is parallel to the riverbank in both states, affecting the promotional effect. To solve this problem, this invention includes a special tensioning mechanism. This mechanism not only tensions display piece 1 but also eliminates the angle difference between the front and back display states. Therefore, before and after switching between the front and back views, the front and back of display piece 1 can face the display direction directly.

[0029] Specifically, the tensioning mechanism includes a tensioning roller 7. An intermediate guide rail 6 is located between the two outer guide rails 5, and the tensioning roller 7 is movably mounted on the intermediate guide rail 6, sliding along it. During the displacement of the two movable frames 4, the tensioning roller 7 abuts against the display piece 1, thereby tensioning the display piece 1 and controlling its shape to prevent wrinkles or damage.

[0030] Furthermore, the outer diameter of the tension roller 7 is exactly equal to the minimum distance between the two movable frames 4. The side of the movable frame 4 facing the opposite outer guide rail 5 is the mounting side, and the display piece 1 is connected to the mounting side of the movable frame 4. (See attached image) Figure 2As shown, when display piece 1 is in either a reverse or forward display state, the tension roller 7 rests against the mounting side of one of the movable frames 4. This allows one side of display piece 1 to connect to the mounting side of the movable frame 4 after passing over the tension roller 7. Because the two outer guide rails 5 are spaced apart, it was originally necessary to cross the space between them at an angle. After the tension roller 7 rests against the movable frame 4, the crossing of the space between the two outer guide rails 5 is changed to passing over the tension roller 7. This eliminates the angle difference between the reverse and forward display states of display piece 1. Therefore, during the navigation of the ship 8, regardless of whether display piece 1 is in a reverse or forward display state, it can remain parallel to the riverbank, allowing people on the riverbank to see display piece 1 directly, meaning that both sides of display piece 1 are facing the display direction.

[0031] The tension roller 7 is located on the side of the projection surface of the display piece 1. Because the painted surface of the display piece 1 has promotional patterns, the tension roller 7 may damage the patterns when it rubs against the painted surface of the display piece 1. The projection surface of the display piece 1 is generally white or light gray, and since it does not have any patterns, it is more suitable to place the tension roller 7 on the side of the projection surface of the display piece 1.

[0032] The tensioning roller 7 is a rotating structural component. The tensioning roller 7 makes rolling contact with the display component 1, making it less likely for the tensioning roller 7 to cause wear to the display component 1.

[0033] The display component 1 has a ventilation structure, such as micropores. Wind speeds on inland waterways are generally low and will not pose a danger to the hull 8 on which the projection screen is hung. However, for safety reasons, a windproof or ventilation structure should be added to the display component 1.

[0034] Combined with appendix Figure 2 This invention provides a method for switching the display surface of a dual-sided switching projection display device, wherein two movable frames 4 are referred to as movable frame A and movable frame B, respectively. The initial state is as shown in the attached diagram. Figure 2 As shown in step a, movable frames A and B are moved away from each other and the display piece 1 is flattened. The tension roller 7 is attached to movable frame A, and one side of the display piece 1 is connected to movable frame A after passing around the tension roller 7. When it is necessary to change the orientation of the display piece 1, the steps are as follows:

[0035] Step S1: Keeping movable frame B stationary, tension roller 7 and movable frame A simultaneously move towards movable frame B, keeping display piece 1 taut during the movement, until movable frame A is close to movable frame B, i.e., movable frame A moves to be opposite movable frame B. (Refer to the attached document.) Figure 2 Steps a, b, and c are shown in the diagram.

[0036] Step S2: With movable frame A stationary, tension roller 7 and movable frame B simultaneously move away from movable frame A, keeping display piece 1 taut during the movement, until movable frames A and B flatten display piece 1 again, and tension roller 7 is against movable frame B. One side of display piece 1 passes around tension roller 7 and connects to movable frame B. (See attached diagram) Figure 2 Steps c, d, and e are shown in the diagram.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A dual-sided switching projection display device, characterized by: The display piece (1) and the switching device (2); one side of the display piece (1) is the display direction, and the display direction has a projection device (3); the display piece (1) has front and back surfaces; the front surface is a projection surface, and when the projection surface faces the display direction, the projection surface can display the picture projected by the projection device (3); the back surface is a drawing surface, and the drawing surface has drawing content, and when the drawing surface faces the display direction, the drawing content is directly displayed; the switching device (2) can switch the direction of the display piece (1), so that the projection surface or the drawing surface faces the display direction.

2. The dual-sided switching projection display apparatus of claim 1, wherein: The display piece (1) is a flexible structure; the switching device (2) includes two movable frames (4), and the two sides of the display piece (1) are connected to the two movable frames (4) respectively; the two movable frames (4) are displaced towards each other and are staggered with each other, and the direction of the display piece (1) is switched.

3. A dual-sided switchable projection display apparatus as claimed in claim 2, characterized in that: The switching device (2) further includes a tightening mechanism, and the flexible display piece (1) can be tightened by the tightening mechanism during the displacement of the two movable frames (4).

4. The dual-sided switching projection display apparatus of claim 3, wherein: The switching device (2) further includes two outer guide rails (5) parallel to each other, and the two movable frames (4) slide along the two outer guide rails (5) respectively; when the two movable frames (4) are away from each other and flatten the display piece (1), if the projection surface faces the display direction, the display piece (1) is in a front display state, and if the drawing surface faces the display direction, the display piece (1) is in a back display state; the two outer guide rails (5) are spaced apart, and the display piece (1) has an angle difference in the front display state and the back display state.

5. A dual-sided switchable projection display device according to claim 4, wherein: The tightening mechanism includes a tightening roller (7); the two outer guide rails (5) have a middle guide rail (6) therebetween, and the tightening roller (7) can slide along the middle guide rail (6); during the displacement of the two movable frames (4), the tightening roller (7) is in contact with the display piece (1) and tightens the display piece (1).

6. A dual-sided switchable projection display device according to claim 5, wherein: The outer diameter of the tightening roller (7) is equal to the minimum distance between the two movable frames (4), one side of the movable frame (4) facing the opposite outer guide rail (5) is the mounting side, and the display piece (1) is connected to the mounting side of the movable frame (4); when the display piece (1) is in a display state or a projection state, the tightening roller (7) is in contact with one of the movable frames (4), so that one side of the display piece (1) passes through the tightening roller (7) and is then connected to the movable frame (4), so as to eliminate the angle difference of the display piece (1) in the front display state and the back display state.

7. A dual-sided switchable projection display device according to claim 6, wherein: The tightening roller (7) is located on the side of the projection surface of the display piece (1).

8. The dual-sided switching projection display apparatus of claim 6, wherein: The tightening roller (7) is a rotary structure, and the tightening roller (7) is in rolling contact with the display piece (1).

9. A dual-sided switchable projection display apparatus as defined in any one of claims 1 to 8, characterized in that: The display piece (1) has a ventilation structure.

10. The method of claim 6, wherein the method further comprises: switching the display surface of the dual-sided projection display device from the first display surface to the second display surface. The two movable frames (4) are an A movable frame and a B movable frame respectively; in an initial state, the A movable frame and the B movable frame are away from each other and flatten the display piece (1), the tightening roller (7) is in contact with the A movable frame, and one side of the display piece (1) passes through the tightening roller (7) and is then connected to the A movable frame; when it is necessary to switch the direction of the display piece (1), the following steps are taken: S1: the B movable frame remains stationary, the tightening roller (7) and the A movable frame are displaced towards the B movable frame at the same time, the display piece (1) is kept tight during the displacement, and the A movable frame approaches the B movable frame until the A movable frame is close to the B movable frame; S2: the A movable frame keeps still, the taut roller (7) and the B movable frame simultaneously displace towards the direction away from the A movable frame, the display piece (1) is kept taut during the displacement process, until the A movable frame and the B movable frame pull the display piece (1) flat again, and the taut roller (7) abuts against the B movable frame, one side of the display piece (1) is connected to the B movable frame after passing around the taut roller (7).

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