CN214623634U - Projection display system - Google Patents

Abstract

The utility model relates to a projection display system, which comprises a projection curtain, a position information film, a writing pen and a projector, wherein the position information film comprises a transparent substrate and a position coding pattern arranged on the substrate; the position information film is movably laid in a display area of the projection curtain; the writing pen is configured to acquire a position-coding pattern image of an acquisition area corresponding to a writing position and a corresponding time when writing on the projection screen on which the position information film is laid; the writing pen is wirelessly connected with the projector, the projector establishes a position coding coordinate system of the position information film on the display area of the projection screen, identifies a writing position corresponding to the position coding pattern, generates a writing image according to the writing position, and projects the writing image to the writing position in the projection screen. The utility model provides a projection display system makes simple, the practicality is strong, low cost.

Description

Projection display system

Technical Field

The utility model relates to an electron device technical field relates to a projection display system especially.

Background

A projector, as an information display device, projects images and information from other image sources, such as a PC, a mobile phone, a video recorder, a video player, etc., onto a projection screen. With industry efforts, current projectors have improved significantly in performance. For example, the projected image is clearer and more uniform, the projection angle of the image can be automatically corrected when the projector and the projection screen are deviated, and the like. These improvements provide a visually pleasing experience for the user. When a projector is used for a presentation, it is often necessary to mark the emphasis in the presentation information to show the emphasis. A method is proposed in chinese patent document No. CN106354343B entitled "projector and method for controlling projector", in which a position detection unit is provided in the projector, and an image of an indicator and an entire image of the indicator and a projection screen are photographed by a photographing unit, and then image analysis is performed to obtain an indication position of the indicator on the projection screen. In addition, another display system, which includes a projection screen, a processing module, and a projector, is proposed in chinese patent document entitled "projection screen, touch projection display method and system" with publication No. CN 105182676B. The projection screen is provided with a capacitive touch film layer, is connected with the processing module and sends touch information to the processing module. And the processing module generates a target image according to the touch information and sends the target image to the projector, and the projector processes the target image and projects the processed image to the projection curtain. The two schemes realize that the operation on the projection curtain is converted into the image and then the image is re-projected on the projection curtain when the information is displayed through different angles. However, in order to achieve the above functions, the former increases the complexity of the optical structure and control system of the projector, making the manufacturing of the projector difficult. In the latter solution, a light emitting unit for determining the touch control boundary needs to be added to the projection screen, and the projector needs to determine the relationship between the display boundary and the touch control boundary according to the light emitted by the light emitting unit, so that the processing procedure is complicated, and the manufacturing cost of the projection screen is high.

SUMMERY OF THE UTILITY MODEL

To the technical problem who exists among the prior art, the utility model provides a projection display system for the discernment is gone on writing and the operation on the projection curtain cloth, writes effectual, low in manufacturing cost.

In order to solve the above technical problem, the present invention provides a projection display system, which includes a projection screen, a position information film, a writing pen, and a projector, wherein the position information film includes a substrate and a position coding pattern disposed on the substrate; the position information film is movably laid in a display area of the projection curtain; the writing pen is configured to acquire a position-coding pattern image of an acquisition area corresponding to a writing position and a corresponding time when writing on the projection screen on which the position information film is laid; the writing pen is wirelessly connected with the projector, the projector at least comprises a position information processing module and a projection control module, the position information processing module establishes a position coding coordinate system of a position information film on a display area of the projection screen, identifies a writing position corresponding to a position coding pattern, and generates a writing image according to the writing position; the projection control module projects the written image to a writing position in a projection screen.

Preferably, the substrate of the position information film is a PET film, an ARM film, a PE film, an OCA film, a toughened glass film or transparent paper; the position-coding pattern is coated or engraved on the substrate.

Preferably, the position-coding pattern engraved on the substrate is lower or higher than the substrate, or a part of the coding pattern is higher than the substrate and a part of the coding pattern is lower than the substrate.

Preferably, the position coding pattern is composed of dots/lines with equal or unequal sizes arranged according to a coding rule.

Preferably, the writing pen comprises a shell, a pen point, a detection module, an image acquisition module and a first wireless communication module, wherein the detection module, the image acquisition module and the first wireless communication module are positioned in the shell; wherein, the tail end of the shell is provided with a detection port; the first end of the pen point is fixed in the shell, and the second end of the pen point extends out of the detection port at the tail end of the shell; the detection module is configured to output an electrical signal when a writing operation of a pen tip on a screen is sensed; the image acquisition module is connected with the detection module and is configured to acquire an acquisition area image corresponding to the point contact position and corresponding time information through the detection port when receiving the electric signal output by the detection module, wherein the image comprises a position coding pattern on the curtain; the first wireless communication module is configured to be connected with the projector and send the data acquired by the image acquisition module to the projector.

Preferably, the detection module comprises a pressure sensor or a proximity sensor or a distance sensor.

Preferably, the image acquisition module comprises a lens assembly and an image sensor, the lens assembly being configured with its field of view adapted to the acquisition area; the image sensor is optically connected with the lens assembly and is configured to acquire image data within an acquisition area through the lens assembly.

Preferably, the image acquisition module comprises a first signal transmitter configured to send a detection signal to the acquisition region, a first signal receiver, and analog-to-digital conversion circuitry; the first signal receiver is configured to accept a detection signal reflection signal reflected back from the acquisition region and generate image data of the acquisition region from the reflection signal; the analog-to-digital conversion circuit is connected with the first signal receiver and is configured to convert the analog signal of the image data generated by the first signal receiver into a digital signal.

Preferably, the first wireless communication module comprises a second signal transmitter and a second signal receiver, the second signal transmitter is located on the circuit board in the housing and modulates transmission data including the position coding pattern image into a wireless carrier signal according to a predetermined protocol to be transmitted; the second signal receiver comprises a data interface for connecting with the projector; the wireless carrier signal sent by the second signal transmitter is received, data is demodulated from the wireless carrier signal, and the data is sent to the projector through the data interface.

Preferably, the projection curtain is 20-150 inches in size; the projector is located on the side, above or below the projection curtain.

The utility model can realize the marking and painting of the projection content on the projection curtain without modifying the prior projector too much, and can also complete the operations of deletion, copy, movement and the like, and the operation is simple; the film with the position coding pattern laid on the projection curtain is easy to process and low in cost. Generally speaking, the utility model provides a projection display system makes simply, the practicality is strong, low cost.

Drawings

Preferred embodiments of the present invention will be described in further detail below with reference to the attached drawings, wherein:

fig. 1 is a schematic diagram of a projection display system according to an embodiment of the present invention;

fig. 2 is a partial schematic view of a projection curtain with a position information film laid according to one embodiment of the present invention;

fig. 3A is a schematic view of a portion of a projection curtain with a position information film applied thereto according to another embodiment of the present invention;

fig. 3B is a schematic view of a portion of a projection curtain with a position information film applied thereto according to another embodiment of the present invention;

fig. 3C is a schematic view of a portion of a projection curtain with a position information film applied thereto according to another embodiment of the present invention;

FIG. 4A is a schematic diagram of a position-coding pattern unit according to an embodiment of the present invention;

FIG. 4B is a schematic diagram of a position-coding pattern unit according to another embodiment of the present invention;

FIG. 4C is a schematic diagram of a position-coding pattern unit according to yet another embodiment of the present invention;

FIG. 5A is a schematic view of a writing pen and collection area according to one embodiment of the present invention;

FIG. 5B is a schematic view of a writing pen and collection area according to another embodiment of the present invention;

fig. 6A is a schematic structural view of a writing pen according to an embodiment of the present invention;

FIG. 6B is a functional block diagram of a writing pen according to one embodiment of the present invention;

fig. 7 is a functional block diagram of an image acquisition module according to an embodiment of the present invention;

fig. 8 is a functional block diagram of an image acquisition module according to another embodiment of the present invention;

fig. 9 is a schematic block diagram of a projector according to an embodiment of the present invention;

fig. 10 is a functional block diagram of a position information processing module provided according to an embodiment of the present invention; and

fig. 11 is a schematic view of a projection display system for displaying a tool area on a projection curtain according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the following detailed description, reference is made to the accompanying drawings that form a part hereof and in which is shown by way of illustration specific embodiments of the application. In the drawings, like numerals describe substantially similar components throughout the different views. Various specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to practice the teachings of the present application. It is to be understood that other embodiments may be utilized and structural, logical or electrical changes may be made to the embodiments of the present application.

Fig. 1 is a schematic diagram of a projection display system according to an embodiment of the present invention, the system includes a projection curtain 1, a writing pen 2 and a projector 3, wherein the projection curtain 1 includes a curtain 11 and a position information film 12 laid on an outer surface of the curtain 11, and the position information film 12 is provided with a position coding pattern. In this embodiment, the projector 3 is connected to an information source, such as the notebook computer 4 in fig. 1, and the information to be displayed is sent by the notebook computer 4 to the projector 3, which is projected by the projector 3 onto the projection screen 1. When a user writes on the projection screen 1 using the writing pen 2, the writing pen 2 collects an image of a collection area corresponding to a writing position, and records time information thereof, and sends it to the projector 3. The writing pen does not need an ink box when writing on the projection screen 1, and does not write ink on the projection screen 1. The projector 3 is wirelessly connected with the writing pen 2, and at least comprises a position information processing module 32 and a projection control module 31 inside the projector, wherein the position information processing module 32 identifies a writing position corresponding to the position coding pattern image and generates a writing image according to the writing position; the projection control module 31 projects the written image to a writing position in a projection screen.

The curtain 11 can be hung on a wall or be in a floor-mounted type on a table, and can be in various sizes, such as 20 inches, 30 inches, 72 inches, 84 inches, 120 inches, 150 inches and the like, a soft or hard outer frame is wrapped around the curtain 11, and an electric device can be further included, so that the curtain can be automatically folded and unfolded. The size of the projection curtain is 20-150 inches; the projector 3 and the projection curtain 1 may have various positional relationships, for example, the projector 3 is located at the side of the projection curtain 1, and for some ultra-short-focus projectors, it may be located above or below the projection curtain 1 to save space.

The position information film 12 is laid on the outer surface of the curtain 11. The position information film 12 is sized to fit the display area of the curtain 11 and has a position-coding pattern disposed thereon. The substrate of the positional information film 12 is a transparent or opaque film. As shown in fig. 2, which is a schematic partial cross-sectional view of a projection curtain with a position information film laid thereon according to an embodiment of the present invention, in this embodiment, a position information film 12a is located on an outer surface of a curtain 11a, and the position information film 12a includes an adhesive layer 120a, a substrate 121a, and a pattern layer 122 a. The substrate 121a may be a PET film, an ARM film, a PE film, or a transparent paper. In the present embodiment, the position-coding pattern layer 122a is coated with paint on the substrate 121 a. The size of the dots forming the position coding pattern can be large or small, and is suitable for the acquisition precision of the writing pen. Fig. 3A-3C are schematic partial cross-sectional views of a projection screen with a position information film laid thereon according to another embodiment of the present invention, in which the position information film 12b is adhered to the outer surface of the projection screen 11b by an adhesive layer 120b, and a position-coding pattern 122b is engraved on the substrate 121 b. In fig. 3A, the same part as the position-coding pattern is removed from the substrate 121B during engraving, so that the resulting position-coding pattern layer 122B is lower than the substrate 121B, whereas in fig. 3B, the same part as the position-coding pattern remains on the substrate 121c during engraving, so that the resulting position-coding pattern layer 122c is higher than the substrate 121 c. Alternatively, as shown in fig. 3C, the dots or lines constituting the position-coding pattern are engraved to different depths, and as shown in the drawing, the dot 122d is deeper and the dot 123d is shallower, and coding is performed by the depth of the dot, and if the sizes of the dots are combined, another more complicated coding can be constituted.

The position coding pattern of the present invention may be a pattern formed by any coding rule. FIG. 4A is a schematic diagram of a 4 × 4 coding pattern unit, in which the large dots and small dots are denoted by 1 and 0 respectively, which can be recognized by a computer. Different information can be obtained by different dot arrangements, which respectively correspond to the corresponding screen positions. FIG. 4B shows another type of coding pattern unit, which is coded according to the different deviation directions and positions of the dots from their reference lines. Alternatively, as shown in fig. 4C, the encoding is performed by the length of the line segment or the rotation direction of the line segment around the reference point.

The writing pen 2 is used for acquiring a position coding pattern image corresponding to a specific position on the projection curtain 1 during writing. When 2 nibs of writing pen point contact projection curtain 1, because position information film 12 has been laid to the surface on the projection curtain 1, writing pen 2 gathers apart from nib contact position predetermined distance, the region of predetermined range, will the utility model discloses in, be called this scope and gather the district. Such as acquisition region 20 shown in fig. 5A. In some embodiments, as shown in fig. 5B, the collection area 20 is a circle with a radius R and a center point of the point contact of the front tip of the writing pen 2 on the screen.

Fig. 6A is a schematic structural diagram of a writing pen according to an embodiment of the present invention. The writing pen 2 includes a housing 3201, a pen tip 203, and an internal circuit. The distal end of the housing 301 is provided with a detection port 202, the first end of the pen tip 203 is fixed in the housing 201, and the second end of the pen tip extends out of the detection port 202 at the distal end of the housing. A circuit board 204 in which various electric components are disposed is fixed inside the housing 201. Further, the screen writing pen 2 further includes a cap 205 which covers the tip of the pen to protect the pen tip when the writing pen 2 is not in use and prevents dust and the like from entering the inside of the housing through the detection port to contaminate the relevant components. The top end of the pen is provided with a hanging hole 207 or a groove 206 for arranging the hanging rope 4. In addition, the charging circuit of the screen writing pen 2 in this embodiment is disposed on the circuit board to supply power to each electronic component, and the charging circuit is connected to the charging interface 208, and displays information of insufficient power through the indicator lamp 209 when the power is insufficient, for example, the indicator lamp is made to flash to prompt the user that the power is insufficient. In addition, a power indicator light, a work indicator light and the like are included to indicate the corresponding states.

Fig. 6B is a schematic block diagram of a writing pen according to an embodiment of the present invention. The writing pen 2 at least comprises a detection module 21, an image acquisition module 22 and a communication module 24, and may further comprise a data processing module 23. The detection module 21 is connected with the pen point, and sends out an electric signal when the pen point touches the screen or approaches the screen. The detection module 21 is, for example, an optoelectronic proximity sensor or a pressure sensor. When the photoelectric proximity sensor is used, the photoelectric sensor emits an electric signal when the distance between the pen point and the projection screen 1 reaches a detection distance. When a pressure sensor is used, the pressure sensor sends an electrical signal when the pen point presses the projection screen 1. The image acquisition module 22 is connected to the detection module 21, and starts to acquire image data of an acquisition area after receiving the electric signal sent by the detection module. Fig. 7 is a functional block diagram of the image acquisition module according to an embodiment of the present invention. In this embodiment, the image acquisition module 22 includes a lens assembly 221 and an image sensor 222. The lens assembly 221 is optically connected to the image sensor 222, the lens assembly 221 can acquire light from the acquisition area, and the image sensor 222 can acquire image data in the acquisition area when the detection module sends an electrical signal to the image sensor 222. The image sensor 222 may be a CMOS device or a CCD device, which can collect data at a predetermined frequency. In order to better acquire the image data of the capturing area, the light inlet at the tip of the writing pen 2 is large, and the lens assemblies 221 are distributed around the tip, so that the capturing area is large enough to acquire enough image data even if the distance between the dots or lines forming the position-coding pattern is large.

Fig. 8 is a functional block diagram of the image acquisition module according to another embodiment of the present invention. In this embodiment, the image acquisition module 22 includes a signal transmitter 224, a signal receiver 225, and an analog-to-digital conversion circuit 226. Wherein the signal emitter 224 is configured to send detection signals to the acquisition region, the detection signals including infrared signals, ultraviolet signals, ultrasonic signals, and the like. By setting the position of the signal emitter 224 within the barrel and its angle of emission, the effective acquisition zone range can be determined, and its reflected signal can be determined to be returned to the barrel for reception by the signal receiver 225. The signal receiver 225 receives the reflected signal reflected from the acquisition region and generates image data of the acquisition region from the reflected signal. Since the generated image data is an analog signal, the analog-to-digital conversion circuit 226 converts the analog signal of the image data generated by the signal receiver 225 into a digital signal for the convenience of processing and transmission.

The data processing module 23 is connected to the image acquisition module 22, and synthesizes the image data and the corresponding time information into transmission data. The communication module 24 is connected to the data processing module 23, and transmits the transmission data to the projector 3 according to a corresponding communication protocol. Through the processing of the position information processing module in the projector 3, the writing image with the same track as that of the writing pen 3 is generated and projected on the projection curtain 1, so that when a user writes and paints on the projection curtain 1 by using the writing pen 2 without ink, the painting and writing information can be displayed at the same position on the projection curtain 1 in real time.

Fig. 9 is a schematic block diagram of a projector according to an embodiment of the present invention. The projector includes a communication module, an information input module 30, a projection control module 31, a projection module 32, and a position information processing module 33, wherein the information input module 30 receives display information from an information source (e.g., the notebook computer 4 in fig. 1) and transmits the display information to the projection control module 31. The projection control module 31 sends the information to the projection module 32. The projection module 32 includes a light source, a light modulation system, a projection optical system, and their respective driving systems. When sending information to the projection module 32, the projection control module 31 sends control signals to the driving system of the light modulation system and the driving system of the projection optical system, respectively, so that the light modulation system optically modulates the display information and projects the display information to the projection screen 1 through the projection optical system. The communication module of the projector is, for example, a bluetooth module, a Wi-Fi module, etc., and wirelessly communicates with the writing pen 3 through a corresponding communication protocol, and sends the image and time data received from the writing pen 2 to the position information processing module 32, and the image information to be projected is obtained after the image and time data are processed by the position information processing module 32.

Fig. 10 is a schematic block diagram of a position information processing module according to an embodiment of the present invention, and the position information processing module 32 includes a coding pattern recognition unit 331, a positioning system establishing unit 332, a position recognition unit 333, a layer unit 334, a point contact trajectory generation unit 335, and an image generation unit 336, where the coding pattern recognition unit 331 recognizes image data sent from the writing pen 2, and recognizes a position coding pattern therefrom. Since the content is being displayed on the curtain 11, the collected point-and-touch position may include a pattern formed by the content displayed on the curtain 11 in addition to the position-coding pattern on the position information film, and the coding pattern recognition unit 331 extracts the position-coding pattern from the current image by using an existing image analysis method. When the writing pen is started, a position coding coordinate system is established firstly, at the moment, a user needs to touch four corners of a display area of the curtain cloth 11, and at the moment, acquired images of four touch positions are obtained. The coding pattern recognition unit 331 extracts the position coding pattern and sends the position coding pattern to the positioning system establishing unit 332. The positioning system establishing unit 332 determines a position-coding coordinate system on the position information film corresponding to the display area of the curtain from the four position-coding patterns for positioning. Specifically, one of the four position-coding patterns is taken out as a first position-coding pattern, and a position-coding unit is determined from the first position-coding pattern and taken as a first point; determining a position coding unit which is in the same line with the first point from other three coding patterns according to a coding rule, and taking the position coding unit as a second point, wherein the position coding pattern with the second point is a second position coding pattern; and determining a position coding unit which is in the same column with the first point from the other two coding patterns according to the coding rule, and taking the position coding unit as a third point, wherein the position coding pattern with the third point is a third position coding pattern, determining a position coding unit which is in the same row with the third point in a fourth position coding pattern, and taking the position coding unit which is in the same column with the second point as a fourth point, thereby obtaining four points corresponding to four point contact positions. And establishing the boundary of the positioning area by taking the four points as vertexes, reading all position coding patterns in the positioning area, and determining the coordinates of each position coding unit in the position coding patterns in the positioning area, so that the established position coding coordinate system can enable the position information film to correspond to the position of the current curtain one by one. After the position coding coordinate system is established, the layer unit 334 establishes a transparent layer having the same size as the positioning area, and the position coordinate system of the transparent layer is the same as the position coding coordinate system. Because the size and the position of the positioning area are the same as those of the curtain display area, the transparent layer can be completely displayed by the curtain, and the positions on the transparent layer correspond to the positions of the curtain one by one. The image generation unit 336 generates one frame image from the generated transparent layer, and transmits the frame image to the projection control module 31 as image data. When the writing pen writes on the curtain, the image acquisition module therein acquires the image of the point-touch position at a high speed, and correspondingly, the coding pattern recognition unit 331 recognizes the corresponding position coding pattern therefrom and sends it to the position recognition unit 333. The position recognition unit 333 determines a touch position of the position-coded pattern recognized by each position recognition unit 333 on the curtain according to the position-coded coordinate system, thereby obtaining a plurality of touch positions. The point-touch trajectory generating unit 335 maps the multiple point-touch positions to multiple second positions of the transparent layer, where the position coordinate system of the transparent layer is the same as the position-coding coordinate system, and thus the aforementioned point-touch positions are the same as the positions on the transparent layer, and the point-touch trajectory generating unit 335 connects the multiple second positions (or called point-touch positions) in sequence on the transparent layer according to the time of each point-touch position to obtain a point-touch trajectory. And if no user intervenes, coarsely connecting a plurality of point contact positions by using a preset color and a preset line. In the process of generating the point contact track in the transparent layer, the image generating unit 336 generates a plurality of frames of point contact track images according to a preset frequency. The projection control module 31 superimposes the image generated by the position information processing module on the data transmitted from the information input module 31, and the light modulation system in the projection module 32 optically adjusts the superimposed display information and projects the information on the projection screen 1 through the projection optical system.

In the present embodiment, the projector 3 has a communication module to perform wireless communication with the writing pen 2. And communication module 24 of stylus 2 may also include a signal transmitter and a signal receiver. The signal transmitter is positioned on a circuit board in the shell 201 of the writing pen 2, and modulates image data to be transmitted into a wireless carrier signal according to a predetermined protocol to be transmitted; the signal receiver includes a data interface, such as a USB interface, and when the writing pen is used, the signal receiver is inserted into the USB interface of the projector 3 to connect the two. The signal receiver receives the wireless carrier signal sent by the signal transmitter, demodulates and integrates image data from the wireless carrier signal, and the projector 3 receives the image data through the data interface.

In the foregoing embodiment, when the layer unit 334 creates the transparent layer with the same size as the positioning area, a tool area including a plurality of editing tools is generated in the transparent layer. The tool area may be located at the edge of the transparent layer, e.g. near the four borders, as shown in fig. 11, and the tool area 13 is located at the side of the layer. Editing tools are for example delete, move, copy, change color or change line thickness, save etc. The image generation unit 336 generates a frame of image by using the transparent layer having the tool area at this time, and transmits the frame of image as image data to the projector 3 by the communication module 34, and displays the image on the projection screen 1. In this case, the user can delete, move, copy, and save the written content while writing on the projection screen 1, and can set the color, thickness, and the like of the line when the point touch trajectory is displayed. When the touch position identified by the position identifying unit 333 corresponds to an editing tool, the touch trajectory generating unit 335 performs a corresponding operation on the touch trajectory on the current transparent layer according to the corresponding editing tool. Since the image generating unit 336 acquires the image of the current layer at a predetermined frequency during the operation of the point-contact trajectory generating unit 335 on the transparent layer, the edited process is also displayed on the projection screen 1 in real time.

The utility model provides a display processing system can satisfy the user and pass through projection curtain 1 to the demand that shows the content mark. For example, when the user is discussing with others about the content currently displayed on the projection screen 1, the power of the writing pen 2 is turned on, the communication connection with the projector 3 is established, and the projector 3 establishes the position-coding coordinate system by touching the writing pen 2 to the 4-corner of the display area on the projection screen 1. When a user needs to emphasize and annotate a certain place in the discussion process, the user can draw a circle, underline and other marking operations at the corresponding position on the projection screen 1 through the writing pen 2 or write an annotation at a proper position beside the displayed content, all the input operations performed by the user can generate corresponding writing images to be projected to the original writing position of the projection screen 1 in real time, and the operation is simple and the use is convenient.

The utility model discloses need not to do too much modification to current projecting apparatus, can be in order to realize on the projection curtain to projection content mark, scribble the drawing through increasing a function plug-in components, can also accomplish and delete, copy, operation such as removal, easy operation, the positional information membrane that has the position coding pattern of laying on the projection curtain, processing is easy, low cost, and the utility model provides a writing a commonality is strong, and it can also be applied to other equipment that have the position coding pattern such as present various cloud note equipment, perhaps adopts present cloud note digital pen, can realize the utility model discloses a function, therefore generally speaking, the utility model provides a projection display system makes simply, the practicality is strong, low cost.

The above embodiments are provided only for the purpose of illustration, and are not intended to limit the present invention, and those skilled in the relevant art can make various changes and modifications without departing from the scope of the present invention, and therefore, all equivalent technical solutions should also belong to the scope of the present invention.

Claims (8)

1. A projection display system, comprising:

a projection screen;

a position information film including a substrate and a position-coding pattern disposed on the substrate; the position information film is movably laid in a display area of the projection curtain;

a writing pen configured to acquire a position-coding pattern image of an acquisition region corresponding to a writing position and a corresponding time while writing on the projection screen on which the position information film is laid; and

the projector is wirelessly connected with the writing pen and at least comprises a position information processing module and a projection control module in the projector, the position information processing module establishes a position coding coordinate system of a position information film on a display area of the projection screen, identifies a writing position corresponding to the position coding pattern and generates a writing image according to the writing position;

the projection control module projects the writing image to a writing position in a projection curtain;

the substrate of the position information film is a PET film, an ARM film, a PE film, an OCA film, a toughened glass film or transparent paper; the position-coding pattern is coated or engraved on the substrate;

the position-coding pattern engraved on the substrate is lower or higher than the substrate, or part of the coding pattern is higher than the substrate and part of the coding pattern is lower than the substrate.

2. A projection display system as claimed in claim 1, characterized in that the position-coding pattern consists of equally or unequally sized dots/lines arranged according to a coding rule.

3. The projection display system of claim 1, wherein the stylus includes a housing, a tip, and a detection module, an image acquisition module, and a first wireless communication module located within the housing; wherein the content of the first and second substances,

the tail end of the shell is provided with a detection port;

the first end of the pen point is fixed in the shell, and the second end of the pen point extends out of the detection port at the tail end of the shell;

the detection module is configured to output an electrical signal when a writing operation of a pen tip on a screen is sensed;

the image acquisition module is connected with the detection module and is configured to acquire an acquisition area image corresponding to the point contact position and corresponding time information through the detection port when receiving the electric signal output by the detection module, wherein the image comprises a position coding pattern on the curtain;

the first wireless communication module is configured to be connected with the projector and send data acquired by the image acquisition module to the projector.

4. A projection display system according to claim 3, wherein the detection module comprises a pressure sensor or a proximity sensor or a distance sensor.

5. The projection display system of claim 3 wherein the image acquisition module comprises:

a lens assembly configured to have a field of view that is compatible with the acquisition region; and

an image sensor optically connected with the lens assembly configured to acquire image data within an acquisition area through the lens assembly.

6. The projection display system of claim 3 wherein the image acquisition module comprises:

a first signal transmitter configured to send a probe signal to the acquisition region;

a first signal receiver configured to accept a detection signal reflection signal reflected back from the acquisition region and to generate image data of the acquisition region from the reflection signal; and

an analog-to-digital conversion circuit connected with the signal receiver and configured to convert an analog signal of the image data generated by the first signal receiver into a digital signal.

7. The projection display system of claim 3 wherein the first wireless communication module comprises:

the second signal emitter is positioned on the circuit board in the shell and modulates the transmission data comprising the position coding pattern image into a wireless carrier signal according to a preset protocol to be emitted; and

a second signal receiver comprising a data interface for connection with the projector; the wireless carrier signal sent by the second signal transmitter is received, data is demodulated from the wireless carrier signal, and the data is sent to the projector through the data interface.

8. The projection display system of claim 1 wherein the projection curtain is 20-150 inches in size; the projector is located on the side, above or below the projection curtain.

Images