Projection curtain, projection system and method, electronic equipment and medium

Abstract

The invention provides a projection curtain, a projection system, a projection method, electronic equipment and a medium, and the projection curtain comprises a curtain body which comprises a first side edge and a second side edge which are opposite to each other in a first direction, and the first side edge and the second side edge extend in a second direction; the first detection module comprises a plurality of photosensitive elements, and at least two photosensitive elements are sequentially distributed on the side where any one of the first side edge and the second side edge is located at intervals in the second direction; the photosensitive element is configured to generate a first sensing signal representing that a projection picture exists at a coordinate position corresponding to the current photosensitive element when the ambient light intensity is detected to be greater than or equal to a threshold value; and when it is detected that the ambient light intensity does not reach the threshold value, generating a second sensing signal representing that no projection picture exists at the coordinate position corresponding to the current photosensitive element. According to the projection curtain, the projection system and method, the electronic equipment and the medium provided by the invention, the operability of the projection system can be improved.

Description

Technical Field

[0001] The present invention relates to the field of projection technology, and in particular to a projection screen, a projection system, a method, an electronic device and a medium. Background Art

[0002] With the continuous development of display technology, the application of large-size display products has increased year by year. The yield rate of large-size LCD displays is low during the production process, and the price is high, so the market share of projection display has increased year by year. However, the current projection display equipment has a relatively single screen function and poor operability. Summary of the invention

[0003] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a projection screen, a projection system, a method, an electronic device and a medium.

[0004] The technical solutions provided by the embodiments of the present disclosure are as follows:

[0005] In a first aspect, an embodiment of the present disclosure provides a projection screen, comprising:

[0006] The curtain body comprises a first side edge and a second side edge which are opposite to each other in a first direction, wherein the first side edge and the second side edge both extend along a second direction, and the first direction intersects with the second direction;

[0007] A first detection module, comprising a plurality of photosensitive elements, at least two of which are sequentially spaced apart and distributed along the second direction on one side of either the first side or the second side;

[0008] Wherein, the photosensitive element is configured to:

[0009] When it is detected that the ambient light intensity is greater than or equal to a threshold, a first sensing signal is generated indicating that there is a projection image at the coordinate position corresponding to the current photosensitive element; when it is detected that the ambient light intensity does not reach the threshold, a second sensing signal is generated indicating that there is no projection image at the coordinate position corresponding to the current photosensitive element.

[0010] Exemplarily, the projection screen further includes:

[0011] The second detection module includes a plurality of light detectors, each of which includes a light emitting end and a light receiving end, and the plurality of light detectors are sequentially spaced along the second direction, and one of the light emitting end and the light receiving end is located on the side where the first side of the curtain body is located, and the other end is located on the side where the second side of the curtain body is located; wherein,

[0012] The light emitting end is configured to emit detection light toward the light receiving end;

[0013] The optical receiving end is configured to:

[0014] When the detection light is received, a first detection signal is generated indicating that there is a touch operation at the coordinate position corresponding to the current light receiving end; when the detection light is received, a second detection signal is generated indicating that there is no touch operation at the coordinate position corresponding to the current light receiving end.

[0015] Exemplarily, the projection screen further includes:

[0016] A first side frame assembly includes a first frame having a first cavity therein, and a reel disposed in the first cavity, the first frame also having an opening communicating with the first cavity, the first side edge of the curtain body extending from the opening into the first cavity and being reeled on the reel; and

[0017] A second side frame assembly includes a second frame, the second side edge being fixedly connected to the second frame;

[0018] The curtain body can be rolled up and unrolled as the rolling shaft rotates, so as to change the unfolding height of the curtain body along the first direction.

[0019] Exemplarily, the screen body further includes a third side and a fourth side extending in parallel along the first direction, and the projection screen further includes a connecting wire electrically connecting the first side frame assembly and the second side frame assembly, and the connecting wire is arranged along at least one of the third side and the fourth side;

[0020] At least one wire component is disposed on the side wall of the first cavity; a partition is disposed in the first cavity, the partition separates the first cavity into a first sub-cavity and a second sub-cavity, the wire component and the reel are located in the first sub-cavity, and the opening is connected to the second sub-cavity; wherein,

[0021] The first end of the connecting wire is fixedly connected to the second frame assembly; the second end of the connecting wire extends from the opening into the first sub-cavity, and extends into the second sub-cavity and is fixed by the wire component. As the unfolded length of the curtain body gradually decreases, the connecting wire is gradually bent and temporarily stored in the second sub-cavity.

[0022] Exemplarily, the first frame also includes a second cavity, one of the light emitting end and the light receiving end is installed in the second cavity, and the second cavity is installed with a first optical sheet on a side facing the second side frame; the second frame also includes a third cavity, the other of the light emitting end and the light receiving end is installed in the third cavity, and the third cavity is installed with a second optical sheet on a side facing the first frame.

[0023] In a second aspect, an embodiment of the present disclosure further provides a projection system, the projection system comprising:

[0024] A projection screen as described above;

[0025] A projection unit, the projection unit being used to project an initial display image onto the projection screen to form a projection image on the projection screen;

[0026] A control unit is used to detect and identify the projection image based on the sensing signal of the first detection module, and to perform distortion correction on the projection image.

[0027] Exemplarily, the control unit specifically includes:

[0028] a preliminary position adjustment module, configured to scale the projection image based on the sensing signal of the first detection module, so as to adjust the projection image to a preliminary position to be corrected, wherein when the projection image is at the preliminary position, among all the photosensitive elements of either the first side or the second side, the sensing signals of at least some of the photosensitive elements are first sensing signals, and the sensing signals of at least some of the photosensitive elements are second sensing signals;

[0029] a first identification module, configured to identify, based on a sensing signal of the photosensitive element at the first side, a photosensitive element corresponding to a first calibration point and a second calibration point in the projection image when the projection image is located at the preliminary position, wherein the first calibration point and the second calibration point are two calibration points located on a side of the projection image close to the first side and spaced apart in the second direction;

[0030] The first distortion correction module is used to adjust the positions of the first calibration point and the second calibration point of the projection image in the first direction respectively, and move the first calibration point and the second calibration point to the target position based on the changes in the sensing signals of the photosensitive elements corresponding to the first calibration point and the second calibration point to complete the distortion correction of the projection image on the side where the first side is located.

[0031] Exemplarily, the control unit further includes:

[0032] A first calculation module, configured to calculate a length X1 of the projection image along the second direction based on a positional relationship between the photosensitive elements corresponding to the first calibration point and the second calibration point;

[0033] A second calculation module, configured to calculate a target width Y1 of the projection picture along the first direction based on the length X1 and a preset projection picture display ratio;

[0034] A screen control module, configured to control the rolling and unrolling state of the projection screen based on the target width Y1, so that the unfolded height of the projection screen in the first direction is the target width Y1;

[0035] a second identification module, configured to identify, based on the sensing signal of the photosensitive element at the first side, the photosensitive element corresponding to the positions of a third calibration point and a fourth calibration point in the projection image, wherein the third calibration point and the fourth calibration point are two calibration points located on one side of the projection image close to the second side and spaced apart in the second direction;

[0036] The second distortion correction module is used to gradually adjust the positions of the third calibration point and the fourth calibration point of the projection image in the first direction and the second direction respectively, and move the third calibration point and the fourth calibration point to the target position based on the changes in the sensing signals of the photosensitive elements corresponding to the third calibration point and the fourth calibration point to complete the distortion correction of the projection image on the side where the second side is located.

[0037] Exemplarily, the first identification module is specifically configured to:

[0038] All the photosensitive elements on the first side are sequentially arranged along the second direction. When the sensing signal of the i-th photosensitive element is the first sensing signal and the sensing signal of the (i-1)-th photosensitive element is the second sensing signal, the i-th photosensitive element is determined as the photosensitive element corresponding to the first calibration point; when the sensing signal of the N1-th photosensitive element is the first sensing signal and the sensing signal of the (m+1)-th photosensitive element is the second sensing signal, the N1-th photosensitive element is determined as the photosensitive element corresponding to the second calibration point;

[0039] The second identification module is specifically configured to: sort all the photosensitive elements on the second side in sequence along the second direction, and determine the i-th photosensitive element as the photosensitive element corresponding to the third calibration point; and determine the N1-th photosensitive element as the photosensitive element corresponding to the fourth calibration point.

[0040] Exemplarily, the control unit further includes:

[0041] A first determination module is used to determine the correspondence between each coordinate point in the touch area and the corresponding coordinate point in the initial display image based on the correspondence between the coordinate information of each calibration point in the projection image after distortion correction on the projection screen and the coordinate information of the touch area formed by the detection light in the second detection module on the projection screen;

[0042] A second determination module, configured to determine coordinate information of a valid touch area based on coordinate information of a touch area formed by the detection light in the second detection module on the projection screen and coordinate information of each calibration point of the projection screen on the projection screen;

[0043] An acquisition module, configured to acquire first coordinate information detected by the second detection module, wherein the first coordinate information is coordinate information corresponding to a first touch operation occurring in the touch area;

[0044] A determination module, configured to determine whether the first coordinate information is within a coordinate threshold of the effective touch area;

[0045] a conversion module, configured to determine a first operation instruction on the initial display screen data corresponding to the first touch operation according to the first coordinate information and the correspondence between the coordinate information of the touch area on the projection screen and the initial display screen data;

[0046] An execution unit is used to control the projection unit to execute the operation corresponding to the first operation instruction.

[0047] In a third aspect, the embodiments of the present disclosure further provide a projection method, which is applied to the projection system as described above, and is characterized in that the projection method comprises:

[0048] Projecting the initial display image onto the projection screen to form a projection image on the projection screen;

[0049] Based on the sensing signal of the first detection module, the projection picture is detected and identified, and distortion correction is performed on the projection picture.

[0050] Exemplarily, the detecting and identifying the projection picture based on the sensing signal of the first detection module and performing distortion correction on the projection picture specifically include:

[0051] Based on the sensing signal of the first detection module, scaling the projection image to adjust the projection image to a preliminary position to be corrected, wherein when the projection image is at the preliminary position, among all the photosensitive elements of either the first side or the second side, sensing signals of at least some of the photosensitive elements are first sensing signals, and sensing signals of at least some of the photosensitive elements are second sensing signals;

[0052] Based on the sensing signal of the photosensitive element at the first side, identifying the photosensitive element corresponding to the position of the first calibration point and the second calibration point in the projection image when located at the preliminary position, wherein the first calibration point and the second calibration point are two calibration points on one side of the projection image close to the first side and spaced apart in the second direction;

[0053] The positions of the first calibration point and the second calibration point of the projection image are respectively adjusted in the first direction, and based on the changes in the sensing signals of the photosensitive elements corresponding to the first calibration point and the second calibration point, the first calibration point and the second calibration point are moved to the target position to complete the distortion correction of the projection image on the side where the first side is located.

[0054] Exemplarily, the detecting and identifying the projection picture based on the sensing signal of the first detection module and performing distortion correction on the projection picture specifically further includes:

[0055] Calculating a length X1 of the projection image along the second direction based on a positional relationship between the photosensitive elements corresponding to the first calibration point and the second calibration point;

[0056] Based on the length X1 and a preset projection picture display ratio, a target width Y1 of the projection picture along the first direction is calculated;

[0057] Based on the target width Y1, controlling the rolling and unrolling state of the projection screen so that the unfolded height of the projection screen in the first direction is the target width Y1;

[0058] Based on the sensing signal of the photosensitive element at the first side, identifying the photosensitive element corresponding to the position of the third calibration point and the fourth calibration point in the projection picture, wherein the third calibration point and the fourth calibration point are two calibration points on one side of the projection picture close to the second side and spaced apart in the second direction;

[0059] The positions of the third calibration point and the fourth calibration point of the projection image are gradually adjusted in the first direction and the second direction respectively, and based on the changes in the sensing signals of the photosensitive elements corresponding to the third calibration point and the fourth calibration point, the third calibration point and the fourth calibration point are moved to the target position to complete the distortion correction of the projection image on the side where the second side is located.

[0060] Exemplarily, the step of identifying the photosensitive element corresponding to the first calibration point and the second calibration point in the projection image at the preliminary position based on the sensing signal of the photosensitive element at the first side edge specifically includes:

[0061] All the photosensitive elements on the first side are sequentially arranged along the second direction. When the sensing signal of the i-th photosensitive element is the first sensing signal and the sensing signal of the (i-1)-th photosensitive element is the second sensing signal, the i-th photosensitive element is determined as the photosensitive element corresponding to the first calibration point; when the sensing signal of the N1-th photosensitive element is the first sensing signal and the sensing signal of the (m+1)-th photosensitive element is the second sensing signal, the N1-th photosensitive element is determined as the photosensitive element corresponding to the second calibration point;

[0062] The step of identifying the photosensitive element corresponding to the positions of the third calibration point and the fourth calibration point in the projection image when the photosensitive element is located at the preliminary position based on the sensing signal of the photosensitive element at the first side edge specifically includes:

[0063] All the photosensitive elements on the second side are arranged in sequence along the second direction, and the i-th photosensitive element is determined as the photosensitive element corresponding to the third calibration point; the N1-th photosensitive element is determined as the photosensitive element corresponding to the fourth calibration point.

[0064] Exemplarily, after performing distortion correction on the picture, the method further includes:

[0065] Determine the correspondence between each coordinate point in the touch area and the corresponding coordinate point in the initial display image based on the correspondence between the coordinate information of each calibration point in the projection image after distortion correction on the projection screen and the coordinate information of the touch area formed by the detection light in the second detection module on the projection screen;

[0066] Determine the coordinate information of the effective touch area based on the coordinate information of the touch area formed by the detection light in the second detection module on the projection screen and the coordinate information of each calibration point of the projection screen on the projection screen;

[0067] Acquire first coordinate information detected by the second detection module, where the first coordinate information is coordinate information corresponding to a first touch operation occurring in the touch area;

[0068] When the first coordinate information is within the coordinate threshold of the effective touch area, the first operation instruction on the initial display screen data corresponding to the first touch operation is determined according to the first coordinate information and the correspondence between the coordinate information of the touch area on the projection screen and the initial display screen data, and the projection unit is controlled to perform the operation corresponding to the first operation instruction.

[0069] In a fourth aspect, an embodiment of the present disclosure further provides an electronic device, the electronic device comprising:

[0070] A memory storing executable instructions;

[0071] A processor runs the executable instructions in the memory to implement the method as described above.

[0072] In a fifth aspect, an embodiment of the present disclosure further provides a computer storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the method as described above.

[0073] The beneficial effects brought by the embodiments of the present disclosure are as follows:

[0074] In the above scheme, at least two photosensitive elements are sequentially distributed along the second direction at intervals on the side where either the first side or the second side is located, and the photosensitive elements are configured to generate corresponding sensing signals by sensing the ambient light intensity, so that the position of the photosensitive element corresponding to the calibration point on the projection screen can be identified, and then based on the sensing signal of the first detection module, the projection screen can be detected and identified, and the projection screen can be distorted. In this way, by adding photosensitive elements to the projection screen to sense the light of the projection screen, the coordinate position of the projection screen can be automatically calculated based on the algorithm, and the distortion correction of the projection screen can be achieved, which can solve the adaptive matching adjustment between the projection screen end and the projector end. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] Figure 1 An exploded view showing the structure of the projection screen provided by an embodiment of the present disclosure;

[0076] Figure 2 1. The figure shows a front view of the projection screen provided by the embodiment of the present disclosure in the unfolded state, wherein (a) shows a front view of the projection screen, (b) shows an enlarged view of a part S1 in (a), and (c) shows an enlarged view of a part S2 in (a);

[0077] Figure 3 A front view showing a projection screen provided by an embodiment of the present disclosure in a rolled-up state;

[0078] Figure 4 express Figure 2 Middle AA section view;

[0079] Figure 5 express Figure 3 Middle BB section view;

[0080] Figure 6 A schematic diagram showing the connection structure between the second side edge of the projection screen body and the second frame in the embodiment of the present disclosure;

[0081] Figure 7An axonometric view showing a projection screen in an unfolded state in an embodiment of the present disclosure;

[0082] Figure 8 An axonometric view showing a projection screen in a rolled-up state in an embodiment of the present disclosure;

[0083] Fig. 9 A schematic diagram showing the principle of the first calibration point and the second calibration point on the projection screen being sensed and identified by the photosensitive element when the projection screen is not displayed in full screen;

[0084] Fig.10 A schematic diagram showing the projection image after distortion correction on the side where the first side is located when the projection image is not displayed in full screen;

[0085] Fig.11 A schematic diagram showing the projection image after distortion correction is completed when the projection image is not displayed in full screen;

[0086] Fig.12 A schematic diagram showing the projection image after distortion correction is performed on the side where the first side is located when the projection image is in full screen display state;

[0087] Fig.13 A schematic diagram showing the projection image after distortion correction is completed when the projection image is displayed in full screen;

[0088] Fig.14 A flowchart showing a projection method provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0089] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0090] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0091] The features such as "parallel", "perpendicular", and "same" used in the embodiments of the present disclosure include the features such as "parallel", "perpendicular", and "same" in a strict sense, as well as the cases where "approximately parallel", "approximately perpendicular", "approximately the same", etc. include certain tolerances, taking into account the tolerances associated with the measurement of specific quantities (e.g., the limitations of the measurement system), and represent the acceptable deviation range for a specific value determined by ordinary technicians in the field. For example, "approximately" can mean within one or more standard deviations, or within 3% or 5% of the value.

[0092] In addition, in this document, unless otherwise defined, the terms "substantially", "substantially", "approximately" and "about" are used to describe and explain small changes. When used with an event or situation, these terms can cover situations where the event or situation occurs exactly, and can also cover situations where the event or situation occurs approximately. For example, when used with a numerical value, these terms can include a range of variation of less than or equal to 10% of the numerical value, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, less than or equal to ±0.05%. The term "substantially coplanar" can refer to two surfaces being arranged along the same plane in the micrometer range, for example, arranged along the same plane within 40μm, 30μm, 20μm, 10μm or 1μm.

[0093] Before describing in detail the projection screen, projection system, method, electronic device, and medium provided by the embodiments of the present disclosure, the following description is given of the related technologies:

[0094] In the related art, the projector only realizes projecting the image onto the projection screen for display through diffuse reflection, which has the advantage of large projection size. However, the projection screen of the projection equipment has relatively single functions and poor operability. For example, the trapezoidal correction of the current projector is adjusted manually or automatically by the TOF sensor (Time of Flight Sensor) on the projector, which makes it difficult to achieve a suitable match with the screen end, and the projection screen has relatively single functions and poor operability.

[0095] In order to solve at least one of the technical problems existing in the related art, the embodiments of the present disclosure provide a projection screen, a projection system, a method, an electronic device and a medium.

[0096] The projection screen provided by the embodiment of the present disclosure includes: a screen body and a first detection module.

[0097] like Figure 1 As shown, the curtain body 100 includes a first side 100A and a second side 100B opposite to each other in a first direction Y. The first side 100A and the second side 100B both extend along a second direction X. The first direction Y intersects with the second direction X.

[0098] Exemplarily, the first direction Y is perpendicular to the second direction X. In a scenario where the curtain body 100 is suspended for projection imaging, the first direction Y may be a vertical direction, and the second direction X may be a horizontal direction.

[0099] like Figure 1 and Figure 2 As shown, the first detection module 200 may include a plurality of photosensitive elements 210 , and at least two photosensitive elements 210 are sequentially spaced apart along the second direction X on one side of either the first side 100A or the second side 100B.

[0100] Exemplarily, on the first side 100A, N1 photosensitive elements 210 are arranged at equal intervals along the second direction X; on the second side 100B, N2 photosensitive elements 210 are arranged at equal intervals along the second direction X. N1 and N2 may both be positive integers greater than 2. Exemplarily, N1=N2. However, this is not limited thereto.

[0101] The photosensitive element 210 is configured to: when it is detected that the ambient light intensity is greater than or equal to a threshold, generate a first sensing signal indicating that there is a projection screen 10 at the coordinate position corresponding to the current photosensitive element 210; when it is detected that the ambient light intensity does not reach the threshold, generate a second sensing signal indicating that there is no projection screen 10 at the coordinate position corresponding to the current photosensitive element 210.

[0102] The working principle of the photosensitive element 210 is that, since the projector projects a highlighted image onto the projection screen and diffusely reflects the image, there is no non-imaging area of ​​the projection image 10 on the projection screen, and the corresponding photosensitive element 210 will only receive the ambient light intensity I0. At this time, the sensing signal of the photosensitive element 210 is the second sensing signal, for example, the second sensing signal can be recorded as 0; and there is an imaging area of ​​the projection image 10 on the projection screen, and the corresponding photosensitive element 210 will only receive the ambient light intensity I=I0+△I, where △I is the light intensity of the projection image 10. At this time, the sensing signal of the photosensitive element 210 is the first sensing signal, for example, the first sensing signal can be recorded as 1.

[0103] It should be noted that the threshold value may be the sum of the ambient light intensity I0 and the illumination intensity ΔI of the projection screen 10. In practical applications, the threshold value may be a value preset based on empirical parameters. However, the present invention is not limited thereto, and the threshold value may also be calculated based on the difference between the light intensity values ​​synchronously detected by the multiple photosensitive elements 210. For example, the maximum difference in light intensity actually detected by the multiple photosensitive elements 210 may be used as the threshold value.

[0104] At least two photosensitive elements 210 are distributed in sequence along the second direction X on one side of either the first side 100A or the second side 100B, and the photosensitive elements 210 are configured to generate corresponding sensing signals by sensing the ambient light intensity. In this way, the position of the photosensitive element 210 corresponding to the calibration point on the projection screen 10 can be identified, and then based on the sensing signal of the first detection module 200, the projection screen 10 can be detected and identified, and the projection screen 10 can be distorted and corrected.

[0105] By adding a photosensitive element 210 to the projection screen to sense the light of the projection image 10, the coordinate position of the projection image 10 can be automatically calculated based on an algorithm, thereby achieving distortion correction of the projection image 10, and solving the adaptive matching adjustment between the projection screen end and the projector end.

[0106] In some embodiments, the curtain body 100 may be configured such that the first side 100A can be rolled up to change the unfolded height of the curtain body 100 along the first direction Y.

[0107] Specifically, the projection screen provided in some embodiments of the present disclosure, by arranging a plurality of the photosensitive elements 210 on the projection screen, the process of achieving distortion correction may include the following steps:

[0108] Step S01, projecting an initial display image onto the projection screen to form a projection image 10 on the projection screen;

[0109] Step S02 : Based on the sensing signal of the first detection module 200 , the projection image 10 is detected and identified, and distortion correction is performed on the projection image 10 .

[0110] The above step S02 may specifically include:

[0111] Step S021: scaling the projection screen 10 based on the sensing signal of the first detection module 200 to adjust the projection screen 10 to a preliminary position to be corrected; wherein, when the projection screen 10 is at the preliminary position, among all the photosensitive elements 210 of either the first side 100A or the second side 100B, the sensing signals of at least some of the photosensitive elements 210 are first sensing signals, and the sensing signals of at least some of the photosensitive elements 210 are second sensing signals;

[0112] Step S022: based on the sensing signal of the photosensitive element 210 at the first side 100A, identify and determine the photosensitive element 210 corresponding to the first calibration point A and the second calibration point B in the projection screen 10; wherein the first calibration point A and the second calibration point B are two calibration points on the side of the projection screen 10 close to the first side 100A and spaced apart in the second direction X;

[0113] Step S023, respectively adjusting the positions of the first calibration point A and the second calibration point B of the projection screen 10 in the first direction Y, and based on the changes in the sensing signals of the photosensitive element 210 corresponding to the first calibration point A and the second calibration point B, moving the first calibration point A and the second calibration point B to the target position, so as to complete the distortion correction of the projection screen 10 on the side where the first side edge 100A is located;

[0114] Step S024, calculating the length X1 of the projection image 10 along the second direction X based on the positional relationship between the first calibration point A and the second calibration point B corresponding to the photosensitive element 210;

[0115] Step S025, calculating a target width Y1 of the projection screen 10 along the first direction Y based on the length X1 and a preset display ratio of the projection screen 10;

[0116] Step S026: Based on the target width Y1, controlling the rolling state of the projection screen so that the unfolded height of the projection screen in the first direction Y is the target width Y1;

[0117] Step S027: Based on the sensing signal of the photosensitive element 210 at the first side 100A, identify the photosensitive element 210 corresponding to the positions of the third calibration point C and the fourth calibration point D in the projection screen 10, wherein the third calibration point C and the fourth calibration point D are two calibration points on the side of the projection screen 10 close to the second side 100B and are spaced apart in the second direction X;

[0118] Step S028, gradually adjust the positions of the third calibration point C and the fourth calibration point D of the projection screen 10 in the first direction Y and the second direction X respectively, and based on the changes in the sensing signals of the photosensitive element 210 corresponding to the third calibration point C and the fourth calibration point D, move the third calibration point C and the fourth calibration point D to the target position to complete the distortion correction of the projection screen 10 on the side where the second side 100B is located.

[0119] In order to explain the above steps more clearly, a specific embodiment is explained below.

[0120] See also Figure 2 As shown, N1 first photosensitive elements 211 are arranged in sequence at equal intervals along the second direction X on the first side 100A, and N2 second photosensitive elements 212 are arranged in sequence at equal intervals along the second direction X on the second side 100B. The N1 first photosensitive elements 211 are arranged in sequence according to a predetermined direction, for example, Figure 1 and Figure 2 Taking the orientation shown in the drawing as an example, the first side 100A is the upper side, and along the direction from the left side to the right side of the curtain body 100, the serial numbers of the N1 first photosensitive elements 211 are 1, 2...N1 in sequence. The N2 second photosensitive elements 212 are arranged in sequence according to the predetermined direction. For example, still taking the orientation shown in the drawing as an example, the second side 100B is the lower side, and along the direction from the left side to the right side of the curtain body 100, the serial numbers of the N2 second photosensitive elements 212 are 1, 2...N2 in sequence.

[0121] In the above step S01, when the initial display picture is projected onto the projection screen by the projection end (such as a projector, etc.), a projection picture 10 is formed at the projection screen end.

[0122] If the size of the projection screen 10 is too small, that is, the projection screen 10 is not in the initial position to be calibrated, the sensing signals of all the photosensitive elements 210 are the second sensing signals. In other words, at this time, the sensing signals of all the photosensitive elements 210 are 0. Fig. 9As shown, the sensing signals of some of the first photosensitive elements 211 in the N1 first photosensitive elements 211 are the first sensing signals 1 , and the sensing signals of some of the first photosensitive elements 211 are the second sensing signals 0 .

[0123] Therefore, in the above step S021, the projection screen 10 can be firstly adjusted to the initial position to be corrected by scaling the projection screen 10. Specifically, if the first sensing signals of all the photosensitive elements 210 are the second sensing signals 0, the projection screen 10 is controlled to be enlarged until the sensing signals of at least part of the photosensitive elements 210 at the first side 100A and the second side 100B are the first sensing signals 1. If the sensing signals of all the photosensitive elements 210 are the first sensing signals 1, the projection screen 10 is controlled to be reduced until the sensing signals in at least one of the photosensitive elements 210 at the first side 100A and the second side 100B are converted to the second sensing signals 0 for the first time. At this point, it can be regarded that the projection screen 10 is in the initial position to be corrected.

[0124] After the projection screen 10 is adjusted to the initial position to be corrected, in the above steps S022 to S028, each calibration point can be adjusted to the target position based on the sensing signal of the photosensitive element 210 and combined with the unfolding height adjustment of the projection screen to perform distortion correction on the projection screen.

[0125] Specifically, a number of calibration points are preset on the projection screen 10, for example, Fig. 9 As shown, the projection screen 10 has four calibration points, namely a first calibration point A, a second calibration point B, a third calibration point C and a fourth calibration point D. The four calibration points may be four corners of the projection screen 10 in a trapezoidal shape.

[0126] Among them, the first calibration point A and the second calibration point B are two calibration points on the side of the projection screen 10 close to the first side 100A and are set apart in the second direction X; the third calibration point C and the fourth calibration point D are two calibration points on the side of the projection screen 10 close to the second side 100B and are set apart in the second direction X.

[0127] In the above step S022, based on the sensing signal of the photosensitive element 210 at the first side 100A, the photosensitive element 210 corresponding to the first calibration point A and the second calibration point B in the projection image 10 is identified and determined; specifically, the following steps may be included:

[0128] Step S0221, sort all the photosensitive elements 210 of the first side 100A along the second direction X in sequence, with serial numbers 1, 2...M respectively, wherein, when the sensing signal of the i-th photosensitive element 210 is the first sensing signal and the sensing signal of the (i-1)-th photosensitive element 210 is the second sensing signal, the i-th photosensitive element 210 is determined as the photosensitive element 210 corresponding to the first calibration point A; when the sensing signal of the N1-th photosensitive element 210 is the first sensing signal and the sensing signal of the (m+1)-th photosensitive element 210 is the second sensing signal, the N1-th photosensitive element 210 is determined as the photosensitive element 210 corresponding to the second calibration point B.

[0129] For example, when the projection screen 10 is Fig. 9 As shown, all the first photosensitive elements 211 at the first side 100A are working, wherein the sensing signal of the first photosensitive element 211 illuminated by the projection screen 10 is the first sensing signal 1, and the sensing signal of the first photosensitive element 211 not illuminated by the projection screen 10 is the second sensing signal 0. Fig. 9 As shown in the figure, the sensing signal fed back by N1 first photosensitive elements 211 is “000011111111111110000”. Therefore, the coordinate position of the first calibration point A corresponding to the fifth first photosensitive element 211 and the coordinate position of the second calibration point B corresponding to the eighteenth first photosensitive element 211 are identified and determined.

[0130] It should be understood that the above is an example based on N1 being 21. In practical applications, the value of M is not limited to this. Theoretically, the larger the value of N1 is, the higher the detection accuracy is.

[0131] It can be seen that, according to the sensing signal of the photosensitive element 210 illuminated by the projection screen 10 , the positions of the two first photosensitive elements 211 corresponding to the first calibration point A and the second calibration point B can be identified.

[0132] In the above step S023, after identifying the position of the photosensitive element 210 corresponding to the first calibration point A and the second calibration point B, the positions of the first calibration point A and the second calibration point B of the projection screen 10 are respectively adjusted in the first direction Y, and based on the changes in the sensing signals of the photosensitive element 210 corresponding to the first calibration point A and the second calibration point B, the first calibration point A and the second calibration point B are moved to the target position to complete the distortion correction of the projection screen 10 on the side where the first side 100A is located.

[0133] In the above step S023 , the first detection module 200 may feed back the acquired data to the control unit of the projection system, and start to perform keystone correction on the upper side of the projection screen 10 .

[0134] Specifically, the above step S023 may include the following steps:

[0135] A coordinate system is established with the first direction Y as the y-axis and the second direction X as the x-axis.

[0136] See also Fig. 9 and Fig.10 As shown, the first calibration point A is driven to move along the first direction Y toward the center of the screen body 100, that is, to move toward the negative axis direction of the y-axis, until the sensing signal of the first sensing signal corresponding to the first calibration point A becomes the second sensing signal 0, and then the first calibration point A is driven to move along the first direction Y toward the direction away from the center of the screen body 100, that is, to move toward the positive axis direction of the y-axis, until the sensing signal of the first photosensitive element 211 corresponding to the first calibration point A just becomes the first sensing signal 1, and then the first calibration point A reaches its target position;

[0137] Similarly, the second calibration point B is driven to move along the first direction Y toward the center of the screen body 100, that is, to move in the negative direction of the y-axis, until the sensing signal of the first sensing signal corresponding to the second calibration point B becomes the second sensing signal 0, and then the second calibration point B is driven to move along the first direction Y away from the center of the screen body 100, that is, to move in the positive direction of the y-axis, until the sensing signal of the first photosensitive element 211 corresponding to the second calibration point B just becomes the first sensing signal 1, and then the second calibration point B reaches its target position.

[0138] See also Fig.10 As shown, when the first calibration point A and the second calibration point B reach their respective target positions, the distortion correction of the projection image 10 on the side where the first side 100A is located is completed.

[0139] It should be noted that the position correction steps for the first calibration point A and the second calibration point B may be performed simultaneously or in sequence according to a preset sequence. However, the sequence of position correction for the first calibration point A and the second calibration point B is not limited, and the first calibration point A may be corrected first, or the second calibration point B may be corrected first.

[0140] After the above step S022, while executing the above step S023 to calibrate the position of the first calibration point A and the second calibration point B, the above step S04 can also be executed. Based on the positional relationship between the photosensitive element 210 corresponding to the first calibration point A and the second calibration point B, the length X1 of the projection screen 10 on the side where the first side 100A is located along the second direction X can be calculated.

[0141] It should be noted that after executing the above step S023, that is, after the distortion correction of the projection screen 10 on the side where the first side 100A is located is completed, step S023' can also be executed. Step S023': a step of performing secondary correction on the positions of the first calibration point A and the second calibration point B.

[0142] Specifically, the above step S023' may include:

[0143] After the position adjustment of the first calibration point A and the second calibration point B is completed, monitoring the photosensitive element corresponding to one of the first calibration point A and the second calibration point B to see whether there is a sensing signal change before and after the position adjustment of the other calibration point;

[0144] If there is no change, the next step is executed, for example, step S024;

[0145] If there is a change, repeat the above step S023 until the photosensitive element corresponding to one of the first calibration point A and the second calibration point B is monitored, and the sensing signal does not change before and after the position of the other calibration point is adjusted.

[0146] In the above scheme, after the first calibration point A and the second calibration point B are adjusted through the above step S023, for example, the first calibration point A is adjusted first and the second calibration point B is adjusted later. Since the adjustment of the second calibration point B may affect the state change of the photosensitive element covered by the first calibration point A, if there is no change, the next step can be executed; if there is a change, continue to readjust the first calibration point A according to the method of the above step S023, and then determine whether the second calibration point B has changed, until the photosensitive element signals corresponding to the two have no change.

[0147] In addition, in order to avoid repeatedly adjusting the positions of the first calibration point A and the second calibration point B, the above step S023 may also be:

[0148] First, determine whether the sensing signals of all the photosensitive elements 210 are the second sensing signal 0;

[0149] If not, the first calibration point A and the second calibration point B are simultaneously moved toward the negative axis direction of the y-axis until the sensing signals of all the photosensitive elements are the second sensing signal 0 for the first time;

[0150] Adjusting the first calibration point A, wherein the first calibration point A moves toward the positive axis direction of the y-axis until the photosensitive element sensing signal corresponding to the first calibration point A first changes to the first sensing signal 1;

[0151] The second calibration point B is adjusted, and the second calibration point B is gradually moved in the positive axis direction of the y-axis. During the movement of the second calibration point B, the photosensitive elements located between the first calibration point A and the second calibration point B will gradually change from the second sensing signal to the first sensing signal along the direction from the first calibration point A to the second calibration point B, and as the second calibration point B gradually moves, the number of photosensitive elements whose sensing signals change from the second sensing signal to the first sensing signal will gradually decrease until the photosensitive elements corresponding to the second calibration point B change to the first sensing signal 1. For example, in the initial stage of the movement of the second calibration point B, the number of photosensitive elements whose sensing signals change from the second sensing signal to the first sensing signal is the largest among the photosensitive elements located between the first calibration point A and the second calibration point B; and in the final stage of the movement of the second calibration point B, the number of photosensitive elements whose sensing signals change from the second sensing signal to the first sensing signal is the smallest among the photosensitive elements located between the first calibration point A and the second calibration point B.

[0152] Therefore, it is possible to determine whether the second calibration point B has reached or is close to its target position based on the change in the number of photosensitive elements that change from the second sensing signal to the first sensing signal. When the number of photosensitive elements that change from the second sensing signal to the first sensing signal is lower than a number threshold (the number threshold can be preset, for example, the number threshold can be 1, etc.), that is, when the number of photosensitive elements that change from the second sensing signal to the first sensing signal is lower than the number that is significantly reduced, the second calibration point B can be stopped from moving along the positive axis direction of the y-axis, and the second calibration point B can be retreated one step along the negative axis direction of the y-axis, and the second calibration point B is located at the target coordinate position.

[0153] Of course, it is understandable that the moving process of the second calibration point B can also be: moving the second calibration point B back and forth in the positive and negative directions of the y-axis until directly finding the position where the sensing signal of the first photosensitive element 211 corresponding to the second calibration point B just becomes the first sensing signal 1.

[0154] In the above step S05, after calculating the length X1 of the projection screen 10 on the side where the first side 100A is located along the second direction X, the target width Y1 of the projection screen 10 along the first direction Y can be calculated based on the preset display ratio of the projection screen 10. For example, if the preset display ratio of the projection screen 10 is 16:9, then

[0155] The preset display ratio of the projection picture 10 may be pre-set in the control unit of the projection system, or may be obtained based on the actual selection operation of the user at the projector end.

[0156] In the above step S026, based on the target width Y1, the rolling state of the projection screen is controlled so that the unfolded height of the projection screen in the first direction Y is the target width Y1. Fig.11 The diagram shows the second side of the projection screen being lowered and the projection image being calibrated on the side where the first side is located. After the projection screen is unfolded to the target width Y1, the lower side of the projection screen (i.e., the side where the second side 100B is located) can be calibrated.

[0157] Specifically, in the above step S027, based on the sensing signal of the photosensitive element 210 at the first side 100A, the photosensitive element 210 corresponding to the positions of the third calibration point C and the fourth calibration point D in the projection image 10 at the initial position is identified. Specifically, the following steps may be included:

[0158] All the photosensitive elements 210 of the second side 100B are arranged in sequence along the second direction X, and the i-th photosensitive element 210 is determined to be the photosensitive element 210 corresponding to the third calibration point C; the N1-th photosensitive element 210 is determined to be the photosensitive element 210 corresponding to the fourth calibration point D.

[0159] For example, see Fig.10 and Fig.11 As shown, when the second side 100B of the projection screen drops to its unfolded length Y1, the N2 second photosensitive elements 212 at the second side 100B are synchronized with the N1 first photosensitive elements 211 at the first side 100A to determine the photosensitive elements 210 corresponding to the third calibration point C and the fourth calibration point D. Taking the sensing signal fed back by the N1 first photosensitive elements 211 as "000011111111111110000" as an example, the 5th second photosensitive element 212 corresponds to the position corresponding to the third calibration point C, and the 18th second photosensitive element 212 corresponds to the position of the fourth calibration point D. It should be understood that the above is an example in which N1 and N2 are both 21. In actual applications, the values ​​of N1 and N2 are not limited to this. In theory, the larger the values ​​of N1 and N2, the higher the detection accuracy.

[0160] In the above step S027, after identifying the position of the photosensitive element 210 corresponding to the third calibration point C and the fourth calibration point D, the positions of the third calibration point C and the fourth calibration point D of the projection screen 10 are adjusted respectively in the first direction Y, and based on the changes in the sensing signals of the photosensitive element 210 corresponding to the third calibration point C and the fourth calibration point D, the third calibration point C and the fourth calibration point D are moved to the target position to complete the distortion correction of the projection screen 10 on the side where the second side 100B is located.

[0161] In the above step S028, the first detection module 200 may feed back the acquired data to the control unit of the projection system, and start to perform trapezoidal correction on the lower side of the projection screen 10. Specifically, the above step S028 may include the following steps:

[0162] A coordinate system is established with the first direction Y as the y-axis and the second direction X as the x-axis.

[0163] See also Fig.10 and Fig.11 As shown, the third calibration point C is moved in the x-direction (i.e., the negative axis direction of the x-axis) until the sensing signal of the second photosensitive element 212 vertically aligned with the first calibration point A in the first direction Y becomes the second sensing signal, and then the third calibration point C is gradually moved in the x+direction (i.e., the positive axis direction of the x-axis) until the sensing signal of the second photosensitive element 212 vertically aligned with the first calibration point A in the first direction Y just becomes the first sensing signal 1, and then the third calibration point C is moved in the y+direction (i.e., the positive axis direction of the y-axis) until the sensing signal of the second photosensitive element 212 vertically aligned with the first calibration point A in the first direction Y becomes the second sensing signal 0, and then the third calibration point C is gradually moved in the y-direction (i.e., the negative axis direction of the y-axis) until the sensing signal of the second photosensitive element 212 vertically aligned with the first calibration point A in the first direction Y just becomes the first sensing signal 1;

[0164] Similarly, the fourth calibration point D is moved in the x-direction (i.e., the negative axis direction of the x-axis) until the sensing signal of the second photosensitive element 212 vertically aligned with the second calibration point B in the first direction Y becomes the second sensing signal 0, and then the fourth calibration point D is gradually moved in the x+ direction (i.e., the positive axis direction of the x-axis) until the sensing signal of the second photosensitive element 212 vertically aligned with the second calibration point B in the first direction Y just becomes the first sensing signal 1, and then the fourth calibration point D is moved in the y+ direction (i.e., the positive axis direction of the y-axis) until the sensing signal of the second photosensitive element 212 vertically aligned with the second calibration point B in the first direction Y becomes the second sensing signal 0, and then the fourth calibration point D is gradually moved in the y-direction (i.e., the negative axis direction of the y-axis) until the sensing signal of the second photosensitive element 212 vertically aligned with the second calibration point B in the first direction Y just becomes the first sensing signal 1. At this point, the calibration of the projection screen 10 on the side where the second side edge 100B is located is completed.

[0165] It should be noted that the position correction steps for the third calibration point C and the fourth calibration point D can be performed simultaneously or in sequence according to a preset sequence. However, the sequence of position correction for the third calibration point C and the fourth calibration point D is not limited, and the third calibration point C can be corrected first, or the fourth calibration point D can be corrected first.

[0166] The projection image 10 after distortion correction is as follows: Fig.11 As shown, the projection screen 10 can be corrected to a rectangle at this time. However, the projection screen 10 is in a non-full screen display state, which is suitable for distortion correction when the projection distance is short. In other application scenarios, the projection screen 10 can also be in a full screen display state.

[0167] In some embodiments, before executing the above step S022, it can be determined whether full screen display is required. If so, in the above step S022, the first photosensitive element 211 corresponding to the first calibration point A and the second calibration point B is identified and determined according to the above step S0221, and then the distortion correction is completed according to the steps from step S023 to step S028 to achieve non-full screen delivery;

[0168] If not, then in the above step S022, it can also be, see Fig.12 As shown, the first first photosensitive element 211 is directly determined as the photosensitive element 210 corresponding to the first calibration point A, and the N1th first photosensitive element 211 is determined as the photosensitive element 210 corresponding to the second calibration point B, and then the steps of step S023 to step S028 are followed to complete the distortion correction and achieve full screen projection. When the full screen is projected, the projection picture 10 before distortion correction is as shown in FIG. Fig.11 As shown, the projection image 10 after distortion correction is as follows Fig.12 shown.

[0169] It should be noted that the above adjustment method is only a correction situation given for describing its logic. When the projected image is at other angles, the correction order of each calibration point may also be different from that in the above embodiment. However, the logical principle for determining the target position of the calibration point is to first move the calibration point back and forth along the x-axis and / or y-axis until the sensing signal of the photosensitive element 210 corresponding to the calibration point is found to change from the second sensing signal 0 to the first sensing signal 1.

[0170] It should also be noted that the above-mentioned distortion correction process can be implemented by a control strategy pre-set by a control unit in the projection system. The projection system may include a projection unit, a control unit and a projection screen. The projection unit is used to project the initial display image onto the projection screen to form a projection screen 10 on the projection screen; the control unit is used to detect and identify the projection screen 10 based on the sensing signal of the first detection module 200, and perform distortion correction on the projection screen 10. The control unit can be integrated in the projection unit of the projection system, or can be integrated on the projection screen. It can be seen that in the embodiment of the present disclosure, by adding a photosensitive element 210 to the projection screen, the position of the marked point in the projection screen 10 can be automatically identified based on the sensing signal of the photosensitive element 210, and the position of the calibrated point can be corrected to solve the problem of mismatch between the projection screen and the projection range of the projector in the related art.

[0171] In addition, as an exemplary embodiment, Figure 3 As shown, the projection screen further includes a first side frame assembly 300 and a second side frame assembly 400. Figure 4 and Figure 5As shown, the first side frame assembly 300 includes a first frame 310 having a first cavity therein, and a reel 320 disposed in the first cavity. Exemplarily, the first frame 310 may include a first frame body 311 and a first end cap 312 located at an end of the first frame body 311. The first frame 310 is also provided with an opening 330 communicating with the first cavity. The first side 100A of the curtain body 100 extends from the opening 330 into the first cavity and is rolled up on the reel 320. The first side 100A of the curtain body 100 is fixedly connected to the reel 320. The reel 320 can rotate under the drive of a driving motor 340 or other driving components. When the reel 320 rotates, it can drive the curtain body 100 to rotate around the reel 320, and the curtain body 100 can be rolled up or unrolled with the rotation of the reel 320, and the unfolding height of the curtain body 100 along the first direction Y can be changed. The fixing method between the first side 100A of the curtain body 100 and the reel 320 includes but is not limited to gluing, screws, sewing, etc.

[0172] The second side frame assembly 400 includes a second frame 410, and the second side edge 100B is fixedly connected to the second frame 410. Exemplarily, the second frame 410 may include a second frame body 411 and a second end cap 412 located at an end of the second frame body 411. Exemplarily, Figure 6 As shown, a folded edge 110 may be provided at the second side 100B of the curtain body 100, and the folded edge 110 may be placed in a corresponding groove on the second frame 410. A plurality of mounting holes are provided on the second frame 410 along the second direction X at intervals, and fasteners 500 are installed in the mounting holes. The fasteners 500 may lock the folded edge 110 in the groove to achieve the fixing and positioning between the curtain body 100 and the second side frame. It should be understood that the above is only an example, and the fixing method between the curtain body 100 and the second side frame is not limited thereto.

[0173] In addition, in the related art, the projection screen has a single function and does not have interactive functions such as touch. Figure 1As shown, the projection screen also includes a second detection module 600. The second detection module 600 may include a plurality of light detectors, each of which includes a light emitting end 610 and a light receiving end 620, and the plurality of light detectors are sequentially spaced along the second direction X, and one of the light emitting end 610 and the light receiving end 620 is located on the side where the first side 100A of the screen body 100 is located, and the other end is located on the side where the second side 100B of the screen body 100 is located; wherein the light emitting end 610 is configured to emit detection light toward the light receiving end; the light receiving end 620 is configured to: when receiving the detection light, generate a first detection signal indicating that there is a touch operation at the coordinate position corresponding to the current light receiving end 620; when receiving the detection light, generate a second detection signal indicating that there is no touch operation at the coordinate position corresponding to the current light receiving end 620.

[0174] With the above scheme, a plurality of light detectors are also arranged on the projection screen. The plurality of light detectors can be arranged in sequence at equal intervals along the second direction X, and the light detectors can emit detection light propagating along the first direction Y, so that the projection screen can realize the touch function. The working principle of the light detector to realize the touch function is as follows: the signal of the light emitting end 610 is received by the light receiving end 620 to form a vertical infrared network coordinate. When a touch object blocks the detection light, the light receiving end 620 will generate a corresponding sensing signal, and based on the number and coordinate position of the light receiving end 620 that is blocked, the blocking coordinate position of the touch object can be calculated. Therefore, by making data correspondence between the detection results of the plurality of light detectors and the projection picture 10 after distortion correction, the touch interaction function of the projection screen can be realized.

[0175] The touch object may include but is not limited to any suitable object such as a finger, a writing pen, or a pointer, etc. Moreover, if the volume of the touch object is too large, it will cause a large deviation in the calculation of the touch coordinate position.

[0176] For example, N3 light emitting ends 610 may be arranged in sequence along the first side 100A, and N3 light receiving ends 620 may be arranged in sequence along the second side 100B. For example, N3 may be equal to N1. One of the photodetectors may be arranged corresponding to one of the photosensitive elements 210, or the photodetectors may be arranged alternately with the photosensitive elements 210.

[0177] As an exemplary embodiment, Figure 1As shown, the screen body 100 also includes a third side 100C and a fourth side 100D extending parallel to the first direction Y, and the projection screen also includes a connecting line 700 for electrically connecting the first side frame assembly 300 and the second side frame assembly 400. For example, the connecting line 700 can be used to electrically connect the light emitting end 610 and the light receiving end 620.

[0178] like Figure 1 As shown, the connection line 700 is arranged along at least one of the third side 100C and the fourth side 100D. Exemplarily, the connection line 700 is arranged on the third side 100C and the fourth side 100D respectively.

[0179] like Figure 4 and Figure 5 As shown, at least one wire component 800 is provided on the side wall of the first cavity; a partition 900 is provided in the first cavity, and the partition 900 separates the first cavity into a first sub-cavity S1 and a second sub-cavity S2, the wire component 800 and the reel 320 are located in the first sub-cavity S1, and the opening 330 is communicated with the second sub-cavity S2; wherein, the first end of the connecting wire 700 is fixedly connected to the second frame 410 assembly; the second end of the connecting wire 700 extends from the opening 330 into the first sub-cavity S1, and extends into the second sub-cavity S2 and is fixed by the wire component 800, and as the unfolded length of the curtain body 100 gradually decreases, the connecting wire 700 is gradually bent and temporarily stored in the second sub-cavity S2.

[0180] In the above solution, the connecting line 700 may include but is not limited to a flexible flat cable. For example, an FFC (Flat Flexible Cable) flat cable, which can be bent and folded. The connecting line 700 can realize transmission between the light emitting end 610 and the light receiving end 620, wherein the two ends of the connecting end can be respectively connected to the connector 630, and connected to the light emitting end 610 and the light receiving end 620 through the connector 630. Exemplarily, the light detector may include but is not limited to an infrared light detector, etc.

[0181] In addition, as an exemplary embodiment, Figure 4 and Figure 5 As shown, a plurality of the wire components 800 may be arranged on the inner side wall of the first cavity, and the plurality of the wire components 800 are sequentially arranged at intervals along the inner side wall of the first cavity. The connection end may sequentially extend along the plurality of the wire components 800, extend out of the first cavity, and be electrically connected to the connector. Figure 5As shown, when the projection screen is rolled up, the connecting wires 700 are bent and folded and accumulated in the first sub-cavity S1.

[0182] As an exemplary embodiment, Figure 4 and Figure 5 As shown, the partition 900 may be a flat plate or an arc-shaped plate, which may be disposed at a corner of the first cavity and cooperate with the inner side wall of the first cavity to form a substantially triangular space. In this way, the space may be effectively utilized to prevent the connecting wire 700 from interfering with the reel 320 and the curtain body 100. It should be understood that the above is only an example, and in actual applications, the partition 900 may also be arranged in other ways.

[0183] Also, see Figure 5 As shown, in some exemplary embodiments, the first frame further includes a second cavity, one of the light emitting end 610 and the light receiving end 620 is installed in the second cavity, and the second cavity is installed with a first optical sheet 650 on the side facing the second side frame; the second frame further includes a third cavity, the other of the light emitting end 610 and the light receiving end 620 is installed in the third cavity, and the third cavity is installed with a second optical sheet 640 on the side facing the first frame. The first optical sheet 650 and the second optical sheet 640 may include, but are not limited to, optical lenses such as filters.

[0184] By adding the photosensitive element 210 and the light detector to the projection screen, not only the automatic distortion correction of the projection image 10 can be achieved, but also the touch interaction function between the projection screen and the projection unit can be achieved.

[0185] The projection screen provided in some embodiments of the present disclosure can realize touch interaction by arranging a plurality of the photosensitive elements 210 and a plurality of the light detectors on the projection screen.

[0186] When the projection screen 10 is in a full-screen display state, the touch area covered by the detection light emitted by the light detector can be completely covered by the projection screen 10. Therefore, in the touch area covered by the detection light emitted by the light detector, the touch operation performed by the touch object at any coordinate point can be regarded as the first touch operation occurring in the projection screen 10; and when the projection screen 10 is in a non-full-screen display state, the touch area covered by the detection light emitted by the light detector is not completely covered by the projection screen 10. Therefore, only the area where the projection screen 10 overlaps with the touch area is a valid touch area, and the touch operation performed by the touch object at any coordinate point in the projection screen 10 can be regarded as the first touch operation occurring in the projection screen 10, while the area where the projection screen 10 does not overlap with the touch area is an invalid touch area.

[0187] Therefore, in the process of realizing touch interaction with the projection screen provided by the embodiment of the present disclosure, step S032 may further include the following steps:

[0188] Step S0321, determining the coordinate information of the effective touch area on the projection screen, and determining the coordinate correspondence between the effective touch area and the initial display screen;

[0189] Step S0322, obtain the second coordinate information of the touch operation detected by the second detection module 600, and determine whether the second coordinate information is within the coordinate threshold of the effective touch area; if so, use the second coordinate information as the first coordinate information corresponding to the first touch operation occurring in the projection screen 10; if not, use the second coordinate information as invalid coordinate information.

[0190] In the above step S0321, the step of determining the coordinate information of the effective touch area on the projection screen may be as follows:

[0191] by Fig.13As shown in the figure, when the projection screen 10 is in full screen display state, the projection screen 10 and the effective touch area can be regarded as completely overlapping, and the first direction Y is taken as the y-axis, the second direction X is taken as the x-axis, and the coordinates of the first calibration point A are taken as the origin (0,0), and a coordinate system is established. Then the coordinates of the second coordinate point are (X,0), the coordinates of the third coordinate point are (X,Y), and the coordinates of the fourth coordinate point are (0,Y). Among them, X is the size of the projection screen 10 along the second direction X, and Y is the size of the projection screen 10 along the first direction Y. For example, X can be 960 and Y can be 540. At this time, the coordinates fed back by each of the light detectors are evenly distributed, and the coordinates in the effective touch area correspond to the coordinates on the projection screen 10 one by one. The effective touch area is the display area of ​​the projection screen 10. Exemplarily, the above coordinates X can be 960 and Y can be 540. It should be understood that X and Y are only touch coordinates assumed to describe the coordinate concept and technical principle more easily, and the following text will also use this as an example for explanation. In actual implementation, the coordinate points are related to the length of the projection screen 10, the touch accuracy, the arrangement density of the light detectors, etc., and the method and density of defining the coordinates may also be different.

[0192] by Fig.11 As shown in the figure, when the projection screen 10 is not in full screen display state, in the touch area covered by the detection light emitted by the light detector, only the area that overlaps with the projection screen 10 is the effective touch area. In the touch area covered by the detection light emitted by the light detector, the coordinate system of the touch area is used as the reference, wherein in the coordinate system of the touch area, the first direction Y is the y-axis, the second direction X is the x-axis, and the coordinate of the first light detector located on the first side 100A is the origin (0,0). The effective touch area overlaps with the projection screen 10, and the coordinates of each calibration point of the projection screen 10 in the coordinate system of the touch area are respectively:

[0193] The coordinates of the first calibration point A are The coordinates of the second calibration point B are That is to say, the horizontal coordinates of the two boundary lines of the effective touch area along the second direction X are greater than or equal to and less than or equal to

[0194] Suppose the second coordinate information of the touch operation detected by the second detection module 600 is (X M, Y M ), then: when When x M =-1; when season when When x M=-1.

[0195] Wherein, Xmax is the maximum touch coordinate point of the frame in the second direction X, for example, Xmax=X2, which is 960 in this example. M, Y M ), x M = -1, the second coordinate information is regarded as invalid touch coordinates, and there is no touch response; when x M If x is not equal to -1, M is a valid value, and a touch response is performed based on the correspondence between the coordinate information of the touch area and the coordinate information of the initial display screen.

[0196] It should be noted that, in some embodiments, the correspondence between the coordinate information of the touch area and the coordinate information of the initial display screen may be as follows:

[0197] When the projection screen 10 is in full screen display state, the touch area completely overlaps with the projection screen 10 , and any coordinate point in the touch area is consistent with a coordinate point in the projection screen 10 .

[0198] When the projection screen 10 is not in full screen display state, the touch area and the projection screen 10 only partially overlap. Taking the coordinate system of the touch area as a reference, the coordinates of the first calibration point A in the projection screen 10 in the coordinate system of the touch area are: The new coordinates converted into the initial projection screen 10 are (0, 0); the coordinates of the second calibration point B in the projection screen 10 in the coordinate system of the touch area are The new coordinates converted into the initial projection image 10 are (x max ,0); the coordinates of the third coordinate point in the projection screen 10 in the coordinate system of the touch area are Convert to new coordinates (x max , Y1); the coordinates of the third coordinate point in the projection screen 10 in the coordinate system of the touch area are The coordinates of any point M in the projection image 10 are converted to new coordinates (0, Y1).

[0199] It should be noted that the above coordinate conversion is only an illustration of one of the calculation methods. The solution of performing equivalent coordinate conversion according to other algorithms to achieve the goal of this case should also be within the scope of protection of the patent.

[0200] In addition, the present disclosure also provides a projection system, the projection system comprising:

[0201] The projection screen in the embodiment of the present disclosure;

[0202] A projection unit, the projection unit being used to project an initial display image onto the projection screen to form a projection image 10 on the projection screen;

[0203] The control unit is used to detect and identify the projection picture 10 based on the sensing signal of the first detection module 200 , and perform distortion correction on the projection picture 10 .

[0204] Exemplarily, the control unit specifically includes:

[0205] a preliminary position adjustment module, configured to scale the projection screen 10 based on the sensing signal of the first detection module 200, so as to adjust the projection screen 10 to a preliminary position to be corrected, wherein when the projection screen 10 is at the preliminary position, among all the photosensitive elements 210 of either the first side 100A or the second side 100B, the sensing signals of at least some of the photosensitive elements 210 are first sensing signals, and the sensing signals of at least some of the photosensitive elements 210 are second sensing signals;

[0206] a first identification module, configured to identify, based on the sensing signal of the photosensitive element 210 at the first side 100A, the photosensitive element 210 corresponding to the positions of the first calibration point A and the second calibration point B in the projection picture 10 at the preliminary position, wherein the first calibration point A and the second calibration point B are two calibration points located on one side of the projection picture 10 close to the first side 100A and spaced apart in the second direction X;

[0207] The first distortion correction module is used to adjust the positions of the first calibration point A and the second calibration point B of the projection screen 10 in the first direction Y, respectively, and based on the changes in the sensing signals of the photosensitive element 210 corresponding to the first calibration point A and the second calibration point B, move the first calibration point A and the second calibration point B to the target position to complete the distortion correction of the projection screen 10 on the side where the first side 100A is located.

[0208] Exemplarily, the control unit further includes:

[0209] A first calculation module, configured to calculate a length X1 of the projection image 10 along the second direction X based on a positional relationship between the photosensitive element 210 corresponding to the first calibration point A and the second calibration point B;

[0210] A second calculation module, configured to calculate a target width Y1 of the projection picture 10 along the first direction Y based on the length X1 and a preset display ratio of the projection picture 10;

[0211] A screen control module, used for controlling the rolling and unrolling state of the projection screen based on the target width Y1, so that the unfolded height of the projection screen in the first direction Y is the target width Y1;

[0212] a second identification module, configured to identify the photosensitive element 210 corresponding to the positions of the third calibration point C and the fourth calibration point D in the projection screen 10 based on the sensing signal of the photosensitive element 210 at the first side 100A, wherein the third calibration point C and the fourth calibration point D are two calibration points which are located on one side of the projection screen 10 close to the second side 100B and are spaced apart in the second direction X;

[0213] The second distortion correction module is used to gradually adjust the positions of the third calibration point C and the fourth calibration point D of the projection screen 10 in the first direction Y and the second direction X, respectively, and based on the changes in the sensing signals of the photosensitive element 210 corresponding to the third calibration point C and the fourth calibration point D, move the third calibration point C and the fourth calibration point D to the target position to complete the distortion correction of the projection screen 10 on the side where the second side 100B is located.

[0214] Exemplarily, the first identification module is specifically configured to:

[0215] All the photosensitive elements 210 of the first side 100A are sequentially arranged along the second direction X. When the sensing signal of the i-th photosensitive element 210 is the first sensing signal and the sensing signal of the (i-1)-th photosensitive element 210 is the second sensing signal, the i-th photosensitive element 210 is determined as the photosensitive element 210 corresponding to the first calibration point A; when the sensing signal of the N1-th photosensitive element 210 is the first sensing signal and the sensing signal of the (m+1)-th photosensitive element 210 is the second sensing signal, the N1-th photosensitive element 210 is determined as the photosensitive element 210 corresponding to the second calibration point B;

[0216] The second identification module is specifically configured to:

[0217] All the photosensitive elements 210 of the second side 100B are arranged in sequence along the second direction X, and the i-th photosensitive element 210 is determined to be the photosensitive element 210 corresponding to the third calibration point C; the N1-th photosensitive element 210 is determined to be the photosensitive element 210 corresponding to the fourth calibration point D.

[0218] Exemplarily, the control unit further includes:

[0219] A first determination module is used to determine the correspondence between each coordinate point in the touch area and the corresponding coordinate point in the initial display image based on the correspondence between the coordinate information of each calibration point in the projection image 10 on the projection screen after distortion correction and the coordinate information of the touch area formed by the detection light in the second detection module on the projection screen;

[0220] A second determination module is used to determine the coordinate information of the effective touch area based on the coordinate information of the touch area formed by the detection light in the second detection module on the projection screen and the coordinate information of each calibration point of the projection screen 10 on the projection screen;

[0221] An acquisition module, configured to acquire first coordinate information detected by the second detection module, wherein the first coordinate information is coordinate information corresponding to a first touch operation occurring in the touch area;

[0222] A determination module, configured to determine whether the first coordinate information is within a coordinate threshold of the effective touch area;

[0223] a conversion module, configured to determine a first operation instruction on the initial display screen data corresponding to the first touch operation according to the first coordinate information and the correspondence between the coordinate information of the touch area on the projection screen and the initial display screen data;

[0224] An execution unit is used to control the projection unit to execute the operation corresponding to the first operation instruction.

[0225] In the above scheme, when the projection screen 10 is in a full-screen display state, the touch area covered by the detection light emitted by the light detector can be completely covered by the projection screen 10. Therefore, in the touch area covered by the detection light emitted by the light detector, the touch operation performed by the touch object at any coordinate point in the touch area can be regarded as a touch operation occurring in the effective touch area; and when the projection screen 10 is in a non-full-screen display state, the touch area covered by the detection light emitted by the light detector is not completely covered by the projection screen 10, and only the area where the projection screen 10 overlaps with the touch area is the effective touch area, and the touch operation performed by the touch object at any coordinate point in the effective touch area can be regarded as a effective touch operation, and the area where the projection screen 10 and the touch area do not overlap is an invalid touch area.

[0226] Specifically, when the projection screen 10 is in full screen display state, all the touch areas are considered to completely overlap with the projection screen 10, and all the touch areas are considered to be valid touch areas. Please refer to the figure as an example, take the first direction Y as the y-axis, and the second direction X as the x-axis to establish a coordinate system. Then, the coordinates of the first calibration point A are the origin (0,0), the coordinates of the second coordinate point are (X1,0), the coordinates of the third coordinate point are (X1,Y1), and the coordinates of the fourth coordinate point are (0,Y1). Among them, X1 is the size of the projection screen 10 along the second direction X, and Y1 is the size of the projection screen 10 along the first direction Y. For example, X can be 960 and Y can be 540. At this time, the coordinates fed back by each of the light detectors are evenly distributed, and any coordinate point in the valid touch area corresponds one-to-one with the coordinate point on the projection screen 10. In other words, the correspondence between the touch area and the coordinate point of the initial display screen is: the touch area corresponds one-to-one with the coordinate point in the initial display screen. Suppose the first coordinate information of the touch operation detected by the second detection module 600 is (X M, Y M ), then the second coordinate information corresponding to the initial display screen is also (X M, Y M ).

[0227] It should be understood that X1 and Y1 are only assumed touch coordinates to describe the coordinate concept and technical principle more easily, and this is also used as an example in the following text. In actual implementation, the coordinate points are related to the length of the projection screen 10 and the touch accuracy, the arrangement density of the light detector, etc., and the coordinate definition method and density will also be different.

[0228] When the projection screen 10 is not in full screen display state, as shown in the figure, among the touch areas covered by the detection light emitted by the light detector, only the area overlapping with the projection screen 10 is the effective touch area, and the area not overlapping with the projection screen 10 is the invalid touch area.

[0229] The coordinate system corresponding to the touch area covered by the detection light emitted by the light detector is used as the reference coordinate system. In the coordinate system of the touch area, the first direction Y is the y-axis, the second direction X is the x-axis, and the coordinate of the first light detector located on the first side 100A is the origin (0,0). The effective touch area coincides with the projection screen 10. Based on the corresponding relationship between the coordinate information of the projection screen 10 and the touch area, it can be known that the coordinates of each calibration point in the projection screen 10 in the reference coordinate system of the touch area are as follows:

[0230] The coordinates of the first calibration point A are

[0231] The coordinates of the second calibration point B are

[0232] Therefore, the first coordinate information of the touch operation detected by the second detection module 600 is (X M, Y M ),but:

[0233] when When x M = -1;

[0234] when season

[0235] when When x M =-1.

[0236] Among them, x max is the maximum touch coordinate point of the border in the second direction X, for example, x max =X2, in this example x max That is 960.

[0237] If the second detection module 600 detects the first coordinate information (X M, Y M ), x M = -1, the first coordinate information is deemed not to be within the coordinate threshold of the effective touch area, that is, the first coordinate information is an invalid touch coordinate and there is no touch response;

[0238] When x M If x is not equal to -1, M is a valid value, that is, the first coordinate information is considered to be within the coordinate threshold of the valid touch area, and a touch response can be performed.

[0239] In addition, based on the above principle analysis, it can be known that the corresponding relationship between each coordinate point in the touch area and the corresponding coordinate point in the initial display screen can be as follows:

[0240] When the projection screen 10 is in full screen display state, the touch area corresponds to the coordinate point in the initial display screen. Suppose the first coordinate information of the touch operation detected by the second detection module 600 is (X M, Y M ), then the second coordinate information corresponding to the initial display screen is also (X M, Y M ).

[0241] When the projection screen 10 is not in full screen display state, among the touch areas covered by the detection light emitted by the light detector, only the area overlapping with the projection screen 10 is the effective touch area, while the area not overlapping with the projection screen 10 is the invalid touch area.

[0242] The coordinate system corresponding to the touch area covered by the detection light emitted by the light detector is used as the reference coordinate system. In the coordinate system of the touch area, the first direction Y is the y-axis, the second direction X is the x-axis, and the coordinate of the first light detector located on the first side 100A is the origin (0,0).

[0243] The effective touch area overlaps with the projection screen 10. Based on the corresponding relationship between the coordinate information of the projection screen 10 and the touch area, it can be known that:

[0244] The original coordinates of each calibration point in the projection image 10 in the reference coordinate system of the touch area are:

[0245] The original coordinates of the first calibration point A are

[0246] The original coordinates of the second calibration point B are

[0247] The original coordinates of the third calibration point C are

[0248] The original coordinates of the fourth calibration point are

[0249] The new coordinates of the above-mentioned calibration points converted into the coordinate system in the initial display screen are as follows:

[0250] The new coordinates of the first calibration point A are (0,0);

[0251] The new coordinates of the second calibration point B are (x max ,0);

[0252] The new coordinates of the third calibration point C are (x max ,Y1);

[0253] The new coordinates of the fourth calibration point D are (0, Y1).

[0254] Assume that the first coordinate information of the touch operation detected by the second detection module 600 in the touch area is (X M, Y M ), then, the new coordinates of the first coordinate information after conversion in the initial display screen are

[0255] It should be noted that the above coordinate conversion is only an illustration of one of the calculation methods. The solution of performing equivalent coordinate conversion according to other algorithms to achieve the goal of this case should also be within the scope of protection of the patent.

[0256] In addition, please combine Fig.14 As shown, the embodiment of the present disclosure further provides a projection method, which is applied to the projection system provided by the embodiment of the present disclosure, and the projection method includes the following steps:

[0257] Step S01, projecting an initial display image onto the projection screen to form a projection image 10 on the projection screen;

[0258] Step S02 : Based on the sensing signal of the first detection module 200 , the projection image 10 is detected and identified, and distortion correction is performed on the projection image 10 .

[0259] Exemplarily, the above step S02 specifically includes:

[0260] Step S021: scaling the projection screen 10 based on the sensing signal of the first detection module 200 to adjust the projection screen 10 to a preliminary position to be corrected, wherein when the projection screen 10 is at the preliminary position, among all the photosensitive elements 210 of either the first side 100A or the second side 100B, the sensing signals of at least some of the photosensitive elements 210 are first sensing signals, and the sensing signals of at least some of the photosensitive elements 210 are second sensing signals;

[0261] Step S022: based on the sensing signal of the photosensitive element 210 at the first side 100A, identify the photosensitive element 210 corresponding to the positions of the first calibration point A and the second calibration point B in the projection screen 10 when located at the preliminary position, wherein the first calibration point A and the second calibration point B are two calibration points located on one side of the projection screen 10 close to the first side 100A and spaced apart in the second direction X;

[0262] Step S023, respectively adjust the positions of the first calibration point A and the second calibration point B of the projection screen 10 in the first direction Y, and based on the changes in the sensing signals of the photosensitive element 210 corresponding to the first calibration point A and the second calibration point B, move the first calibration point A and the second calibration point B to the target position to complete the distortion correction of the projection screen 10 on the side where the first side 100A is located.

[0263] Exemplarily, step S02 specifically further includes:

[0264] Step S024, calculating the length X1 of the projection image 10 along the second direction X based on the positional relationship between the first calibration point A and the second calibration point B corresponding to the photosensitive element 210;

[0265] Step S025, calculating a target width Y1 of the projection screen 10 along the first direction Y based on the length X1 and a preset display ratio of the projection screen 10;

[0266] Step S026: Based on the target width Y1, controlling the rolling state of the projection screen so that the unfolded height of the projection screen in the first direction Y is the target width Y1;

[0267] Step S027: Based on the sensing signal of the photosensitive element 210 at the first side 100A, identify the photosensitive element 210 corresponding to the positions of the third calibration point C and the fourth calibration point D in the projection screen 10, wherein the third calibration point C and the fourth calibration point D are two calibration points on the side of the projection screen 10 close to the second side 100B and are spaced apart in the second direction X;

[0268] Step S028, gradually adjust the positions of the third calibration point C and the fourth calibration point D of the projection screen 10 in the first direction Y and the second direction X respectively, and based on the changes in the sensing signals of the photosensitive element 210 corresponding to the third calibration point C and the fourth calibration point D, move the third calibration point C and the fourth calibration point D to the target position to complete the distortion correction of the projection screen 10 on the side where the second side 100B is located.

[0269] Exemplarily, the above step S022 specifically includes:

[0270] Step S0221, sort all the photosensitive elements 210 of the first side 100A in sequence along the second direction X. When the sensing signal of the i-th photosensitive element 210 is the first sensing signal and the sensing signal of the (i-1)-th photosensitive element 210 is the second sensing signal, the i-th photosensitive element 210 is determined as the photosensitive element 210 corresponding to the first calibration point A; when the sensing signal of the N1-th photosensitive element 210 is the first sensing signal and the sensing signal of the (m+1)-th photosensitive element 210 is the second sensing signal, the N1-th photosensitive element 210 is determined as the photosensitive element 210 corresponding to the second calibration point B.

[0271] Step S027 specifically includes: sorting all the photosensitive elements 210 of the second side 100B in sequence along the second direction X, and determining the i-th photosensitive element 210 as the photosensitive element 210 corresponding to the third calibration point C; and determining the N1-th photosensitive element 210 as the photosensitive element 210 corresponding to the fourth calibration point D.

[0272] Exemplarily, after performing distortion correction on the picture, the method further includes:

[0273] Step S031, determining the correspondence between each coordinate point in the touch area and the corresponding coordinate point in the initial display image based on the correspondence between the coordinate information of each calibration point in the projection image 10 after distortion correction on the projection screen and the coordinate information of the touch area formed by the detection light in the second detection module on the projection screen;

[0274] Step S032, determining the coordinate information of the effective touch area based on the coordinate information of the touch area formed by the detection light in the second detection module on the projection screen and the coordinate information of each calibration point of the projection screen 10 on the projection screen;

[0275] Step S033, acquiring first coordinate information detected by the second detection module, where the first coordinate information is coordinate information corresponding to a first touch operation occurring in the touch area;

[0276] Step S034: When the first coordinate information is within the coordinate threshold of the effective touch area, determine the first operation instruction on the initial display screen data corresponding to the first touch operation according to the first coordinate information and the correspondence between the coordinate information of the touch area on the projection screen and the initial display screen data, and control the projection unit to execute the operation corresponding to the first operation instruction; if the first coordinate information is not within the coordinate threshold of the effective touch area, determine that the first touch operation is an invalid touch operation, and control the projection unit not to respond to the first touch operation.

[0277] In the above scheme, when the projection screen 10 is in a full-screen display state, the touch area covered by the detection light emitted by the light detector can be completely covered by the projection screen 10. Therefore, in the touch area covered by the detection light emitted by the light detector, the touch operation performed by the touch object at any coordinate point in the touch area can be regarded as a touch operation occurring in the effective touch area; and when the projection screen 10 is in a non-full-screen display state, the touch area covered by the detection light emitted by the light detector is not completely covered by the projection screen 10, and only the area where the projection screen 10 overlaps with the touch area is the effective touch area, and the touch operation performed by the touch object at any coordinate point in the effective touch area can be regarded as a effective touch operation, and the area where the projection screen 10 and the touch area do not overlap is an invalid touch area.

[0278] Specifically, when the projection screen 10 is in full screen display state, all the touch areas are considered to completely overlap with the projection screen 10, and all the touch areas are considered to be valid touch areas. Please refer to the figure as an example, take the first direction Y as the y-axis, and the second direction X as the x-axis to establish a coordinate system. Then, the coordinates of the first calibration point A are the origin (0,0), the coordinates of the second coordinate point are (X1,0), the coordinates of the third coordinate point are (X1,Y1), and the coordinates of the fourth coordinate point are (0,Y1). Among them, X1 is the size of the projection screen 10 along the second direction X, and Y1 is the size of the projection screen 10 along the first direction Y. For example, X can be 960 and Y can be 540. At this time, the coordinates fed back by each of the light detectors are evenly distributed, and any coordinate point in the valid touch area corresponds one-to-one with the coordinate point on the projection screen 10. In other words, the correspondence between the touch area and the coordinate point of the initial display screen is: the touch area corresponds one-to-one with the coordinate point in the initial display screen. Suppose the first coordinate information of the touch operation detected by the second detection module 600 is (X M, Y M ), then the second coordinate information corresponding to the initial display screen is also (X M, Y M ).

[0279] It should be understood that X1 and Y1 are only assumed touch coordinates to describe the coordinate concept and technical principle more easily, and this is also used as an example in the following text. In actual implementation, the coordinate points are related to the length of the projection screen 10 and the touch accuracy, the arrangement density of the light detector, etc., and the coordinate definition method and density will also be different.

[0280] When the projection screen 10 is not in full screen display state, as shown in the figure, among the touch areas covered by the detection light emitted by the light detector, only the area overlapping with the projection screen 10 is the effective touch area, and the area not overlapping with the projection screen 10 is the invalid touch area.

[0281] The coordinate system corresponding to the touch area covered by the detection light emitted by the light detector is used as the reference coordinate system. In the coordinate system of the touch area, the first direction Y is the y-axis, the second direction X is the x-axis, and the coordinate of the first light detector located on the first side 100A is the origin (0,0). The effective touch area coincides with the projection screen 10. Based on the corresponding relationship between the coordinate information of the projection screen 10 and the touch area, it can be known that the coordinates of each calibration point in the projection screen 10 in the reference coordinate system of the touch area are as follows:

[0282] The coordinates of the first calibration point A are

[0283] The coordinates of the second calibration point B are

[0284] Therefore, the first coordinate information of the touch operation detected by the second detection module 600 is (X M, Y M ),but:

[0285] when When x M = -1;

[0286] when season

[0287] when When x M =-1.

[0288] Among them, x max is the maximum touch coordinate point of the border in the second direction X, for example, x max =X2, in this example x max That is 960.

[0289] If the second detection module 600 detects the first coordinate information (X M, Y M ), x M = -1, the first coordinate information is deemed not to be within the coordinate threshold of the effective touch area, that is, the first coordinate information is an invalid touch coordinate and there is no touch response;

[0290] When x M If x is not equal to -1, Mis a valid value, that is, the first coordinate information is considered to be within the coordinate threshold of the valid touch area, and a touch response can be performed.

[0291] In addition, based on the above principle analysis, it can be known that the corresponding relationship between each coordinate point in the touch area and the corresponding coordinate point in the initial display screen can be as follows:

[0292] When the projection screen 10 is in full screen display state, the touch area corresponds to the coordinate point in the initial display screen. Suppose the first coordinate information of the touch operation detected by the second detection module 600 is (X M, Y M ), then the second coordinate information corresponding to the initial display screen is also (X M, Y M ).

[0293] When the projection screen 10 is not in full screen display state, as shown in the figure, among the touch areas covered by the detection light emitted by the light detector, only the area overlapping with the projection screen 10 is the effective touch area, and the area not overlapping with the projection screen 10 is the invalid touch area.

[0294] The coordinate system corresponding to the touch area covered by the detection light emitted by the light detector is used as the reference coordinate system. In the coordinate system of the touch area, the first direction Y is the y-axis, the second direction X is the x-axis, and the coordinate of the first light detector located on the first side 100A is the origin (0,0).

[0295] The effective touch area overlaps with the projection screen 10. Based on the corresponding relationship between the coordinate information of the projection screen 10 and the touch area, it can be known that:

[0296] The original coordinates of each calibration point in the projection image 10 in the reference coordinate system of the touch area are:

[0297] The original coordinates of the first calibration point A are

[0298] The original coordinates of the second calibration point B are

[0299] The original coordinates of the third calibration point C are ( Y1);

[0300] The original coordinates of the fourth calibration point are

[0301] The new coordinates of the above-mentioned calibration points converted into the coordinate system in the initial display screen are as follows:

[0302] The new coordinates of the first calibration point A are (0,0);

[0303] The new coordinates of the second calibration point B are (x max ,0);

[0304] The new coordinates of the third calibration point C are (x max ,Y1);

[0305] The new coordinates of the fourth calibration point D are (0, Y1).

[0306] Assume that the first coordinate information of the touch operation detected by the second detection module 600 in the touch area is (X M ,Y M ), then, the new coordinates of the first coordinate information after conversion in the initial display screen are

[0307] It should be noted that the above coordinate conversion is only an illustration of one of the calculation methods. The solution of performing equivalent coordinate conversion according to other algorithms to achieve the goal of this case should also be within the scope of protection of the patent.

[0308] It should also be noted that, for the projection system and projection method provided in the embodiments of the present disclosure, since the principles of solving the problems by the projection system and projection method are similar to the principles of solving the problems by the projection screen provided in the embodiments of the present disclosure, the embodiments of the projection system and projection method provided in the embodiments of the present disclosure can refer to the embodiments of the above-mentioned projection screen provided in the embodiments of the present disclosure, and will not be repeated here.

[0309] In addition, an embodiment of the present disclosure further provides an electronic device, the electronic device comprising:

[0310] A memory storing executable instructions;

[0311] A processor runs the executable instructions in the memory to implement the method as described above.

[0312] In addition, an embodiment of the present disclosure further provides a computer storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the above method.

[0313] The computer-readable storage medium may be an internal storage unit of a device of any of the aforementioned embodiments, such as a hard disk or memory of a projection device. The computer-readable storage medium may also be an external storage device of a projection device, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the projection device. Furthermore, the computer-readable storage medium may also include both an internal storage unit of the projection device and an external storage device. The computer-readable storage medium is used to store computer programs and other programs and data required by the projection system. The computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.

[0314] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0315] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the servers and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0316] In the several embodiments provided in the present application, it should be understood that the disclosed server and method can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or it can be an electrical, mechanical or other form of connection.

[0317] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of the present application.

[0318] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0319] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[0320] The above are only specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present disclosure shall be based on the protection scope of the claims.

Claims

1. A projection screen, characterized in that: include: The curtain body comprises a first side edge and a second side edge which are opposite to each other in a first direction, wherein the first side edge and the second side edge both extend along a second direction, and the first direction intersects with the second direction; A first detection module, comprising a plurality of photosensitive elements, at least two of which are sequentially spaced apart and distributed along the second direction on one side of either the first side or the second side; Wherein, the photosensitive element is configured to: When it is detected that the ambient light intensity is greater than or equal to a threshold, a first sensing signal is generated indicating that there is a projection image at the coordinate position corresponding to the current photosensitive element; when it is detected that the ambient light intensity does not reach the threshold, a second sensing signal is generated indicating that there is no projection image at the coordinate position corresponding to the current photosensitive element.

2. The projection screen according to claim 1, characterized in that: The projection screen also includes: The second detection module includes a plurality of light detectors, each of which includes a light emitting end and a light receiving end, and the plurality of light detectors are sequentially spaced along the second direction, and one of the light emitting end and the light receiving end is located on the side where the first side of the curtain body is located, and the other end is located on the side where the second side of the curtain body is located; wherein, The light emitting end is configured to emit detection light toward the light receiving end; The optical receiving end is configured to: When the detection light is received, a first detection signal is generated indicating that there is a touch operation at the coordinate position corresponding to the current light receiving end; when the detection light is received, a second detection signal is generated indicating that there is no touch operation at the coordinate position corresponding to the current light receiving end.

3. The projection screen according to claim 2, characterized in that: The projection screen also includes: A first side frame assembly includes a first frame having a first cavity therein, and a reel disposed in the first cavity, the first frame also having an opening communicating with the first cavity, the first side edge of the curtain body extending from the opening into the first cavity and being reeled on the reel; and A second side frame assembly includes a second frame, the second side edge being fixedly connected to the second frame; The curtain body can be rolled up and unrolled as the rolling shaft rotates, so as to change the unfolding height of the curtain body along the first direction.

4. The projection screen according to claim 3, characterized in that: The screen body further includes a third side and a fourth side extending in parallel along the first direction, and the projection screen further includes a connecting wire electrically connecting the first side frame assembly and the second side frame assembly, and the connecting wire is arranged along at least one of the third side and the fourth side; At least one wire component is disposed on the side wall of the first cavity; a partition is disposed in the first cavity, the partition separates the first cavity into a first sub-cavity and a second sub-cavity, the wire component and the reel are located in the first sub-cavity, and the opening is connected to the second sub-cavity; wherein, The first end of the connecting wire is fixedly connected to the second frame assembly; the second end of the connecting wire extends from the opening into the first sub-cavity, and extends into the second sub-cavity and is fixed by the wire component. As the unfolded length of the curtain body gradually decreases, the connecting wire is gradually bent and temporarily stored in the second sub-cavity.

5. The projection screen according to claim 4, characterized in that: The first frame also includes a second cavity, one of the light emitting end and the light receiving end is installed in the second cavity, and the second cavity is installed with a first optical sheet on a side facing the second side frame; the second frame also includes a third cavity, the other of the light emitting end and the light receiving end is installed in the third cavity, and the third cavity is installed with a second optical sheet on a side facing the first frame.

6. A projection system, characterized in that: The projection system comprises: The projection screen according to any one of claims 1 to 5; A projection unit, the projection unit being used to project an initial display image onto the projection screen to form a projection image on the projection screen; A control unit is used to detect and identify the projection image based on the sensing signal of the first detection module, and to perform distortion correction on the projection image.

7. The projection system according to claim 6, characterized in that: The control unit specifically comprises: a preliminary position adjustment module, configured to scale the projection image based on the sensing signal of the first detection module, so as to adjust the projection image to a preliminary position to be corrected, wherein when the projection image is at the preliminary position, among all the photosensitive elements of either the first side or the second side, the sensing signals of at least some of the photosensitive elements are first sensing signals, and the sensing signals of at least some of the photosensitive elements are second sensing signals; a first identification module, configured to identify, based on a sensing signal of the photosensitive element at the first side, a photosensitive element corresponding to a first calibration point and a second calibration point in the projection image when the projection image is located at the preliminary position, wherein the first calibration point and the second calibration point are two calibration points located on a side of the projection image close to the first side and spaced apart in the second direction; The first distortion correction module is used to adjust the positions of the first calibration point and the second calibration point of the projection image in the first direction respectively, and move the first calibration point and the second calibration point to the target position based on the changes in the sensing signals of the photosensitive elements corresponding to the first calibration point and the second calibration point to complete the distortion correction of the projection image on the side where the first side is located.

8. The projection system according to claim 7, characterized in that: The control unit also includes: A first calculation module, configured to calculate a length X1 of the projection image along the second direction based on a positional relationship between the photosensitive elements corresponding to the first calibration point and the second calibration point; A second calculation module, configured to calculate a target width Y1 of the projection picture along the first direction based on the length X1 and a preset projection picture display ratio; A screen control module, configured to control the rolling and unrolling state of the projection screen based on the target width Y1, so that the unfolded height of the projection screen in the first direction is the target width Y1; a second identification module, configured to identify, based on the sensing signal of the photosensitive element at the first side, the photosensitive element corresponding to the positions of a third calibration point and a fourth calibration point in the projection image, wherein the third calibration point and the fourth calibration point are two calibration points located on one side of the projection image close to the second side and spaced apart in the second direction; The second distortion correction module is used to gradually adjust the positions of the third calibration point and the fourth calibration point of the projection image in the first direction and the second direction respectively, and move the third calibration point and the fourth calibration point to the target position based on the changes in the sensing signals of the photosensitive elements corresponding to the third calibration point and the fourth calibration point to complete the distortion correction of the projection image on the side where the second side is located.

9. The projection system according to claim 8, characterized in that: The first identification is specifically configured to: All the photosensitive elements on the first side are sequentially arranged along the second direction. When the sensing signal of the i-th photosensitive element is the first sensing signal and the sensing signal of the (i-1)-th photosensitive element is the second sensing signal, the i-th photosensitive element is determined as the photosensitive element corresponding to the first calibration point; when the sensing signal of the N1-th photosensitive element is the first sensing signal and the sensing signal of the (m+1)-th photosensitive element is the second sensing signal, the N1-th photosensitive element is determined as the photosensitive element corresponding to the second calibration point; The second identification module is specifically configured to: All the photosensitive elements on the second side are arranged in sequence along the second direction, and the i-th photosensitive element is determined as the photosensitive element corresponding to the third calibration point; the N1-th photosensitive element is determined as the photosensitive element corresponding to the fourth calibration point.

10. The projection system according to claim 7, characterized in that: When the projection screen is the projection screen as claimed in claim 2, the control unit further comprises: A first determination module is used to determine the correspondence between each coordinate point in the touch area and the corresponding coordinate point in the initial display image based on the correspondence between the coordinate information of each calibration point in the projection image after distortion correction on the projection screen and the coordinate information of the touch area formed by the detection light in the second detection module on the projection screen; A second determination module, configured to determine coordinate information of a valid touch area based on coordinate information of a touch area formed by the detection light in the second detection module on the projection screen and coordinate information of each calibration point of the projection screen on the projection screen; An acquisition module, configured to acquire first coordinate information detected by the second detection module, wherein the first coordinate information is coordinate information corresponding to a first touch operation occurring in the touch area; A determination module, configured to determine whether the first coordinate information is within a coordinate threshold of the effective touch area; a conversion module, configured to determine a first operation instruction on the initial display screen data corresponding to the first touch operation according to the first coordinate information and the correspondence between the coordinate information of the touch area on the projection screen and the initial display screen data; An execution unit is used to control the projection unit to execute the operation corresponding to the first operation instruction.

11. A projection method, applied to the projection system according to any one of claims 6 to 10, characterized in that: The projection method comprises: Projecting the initial display image onto the projection screen to form a projection image on the projection screen; Based on the sensing signal of the first detection module, the projection picture is detected and identified, and distortion correction is performed on the projection picture.

12. The projection method according to claim 11, characterized in that: The detecting and identifying the projection picture based on the sensing signal of the first detection module and performing distortion correction on the projection picture specifically includes: Based on the sensing signal of the first detection module, scaling the projection image to adjust the projection image to a preliminary position to be corrected, wherein when the projection image is at the preliminary position, among all the photosensitive elements of either the first side or the second side, sensing signals of at least some of the photosensitive elements are first sensing signals, and sensing signals of at least some of the photosensitive elements are second sensing signals; Based on the sensing signal of the photosensitive element at the first side, identifying the photosensitive element corresponding to the position of the first calibration point and the second calibration point in the projection image when located at the preliminary position, wherein the first calibration point and the second calibration point are two calibration points on one side of the projection image close to the first side and spaced apart in the second direction; The positions of the first calibration point and the second calibration point of the projection image are respectively adjusted in the first direction, and based on the changes in the sensing signals of the photosensitive elements corresponding to the first calibration point and the second calibration point, the first calibration point and the second calibration point are moved to the target position to complete the distortion correction of the projection image on the side where the first side is located.

13. The projection method according to claim 12, characterized in that: The detecting and identifying the projection picture based on the sensing signal of the first detection module and performing distortion correction on the projection picture specifically includes: Calculating a length X1 of the projection image along the second direction based on a positional relationship between the photosensitive elements corresponding to the first calibration point and the second calibration point; Based on the length X1 and a preset projection picture display ratio, a target width Y1 of the projection picture along the first direction is calculated; Based on the target width Y1, controlling the rolling and unrolling state of the projection screen so that the unfolded height of the projection screen in the first direction is the target width Y1; Based on the sensing signal of the photosensitive element at the first side, identifying the photosensitive element corresponding to the position of the third calibration point and the fourth calibration point in the projection picture, wherein the third calibration point and the fourth calibration point are two calibration points on one side of the projection picture close to the second side and spaced apart in the second direction; The positions of the third calibration point and the fourth calibration point of the projection image are gradually adjusted in the first direction and the second direction respectively, and based on the changes in the sensing signals of the photosensitive elements corresponding to the third calibration point and the fourth calibration point, the third calibration point and the fourth calibration point are moved to the target position to complete the distortion correction of the projection image on the side where the second side is located.

14. The projection method according to claim 12, characterized in that: The step of identifying the photosensitive element corresponding to the first calibration point and the second calibration point in the projection image at the preliminary position based on the sensing signal of the photosensitive element at the first side edge specifically includes: All the photosensitive elements on the first side are sequentially arranged along the second direction. When the sensing signal of the i-th photosensitive element is the first sensing signal and the sensing signal of the (i-1)-th photosensitive element is the second sensing signal, the i-th photosensitive element is determined as the photosensitive element corresponding to the first calibration point; when the sensing signal of the N1-th photosensitive element is the first sensing signal and the sensing signal of the (m+1)-th photosensitive element is the second sensing signal, the N1-th photosensitive element is determined as the photosensitive element corresponding to the second calibration point; The step of identifying the photosensitive element corresponding to the positions of the third calibration point and the fourth calibration point in the projection image when the photosensitive element is located at the preliminary position based on the sensing signal of the photosensitive element at the first side edge specifically includes: All the photosensitive elements on the second side are arranged in sequence along the second direction, and the i-th photosensitive element is determined as the photosensitive element corresponding to the third calibration point; the N1-th photosensitive element is determined as the photosensitive element corresponding to the fourth calibration point.

15. The projection method according to claim 12, characterized in that: After performing distortion correction on the picture, the method further includes: Determine the correspondence between each coordinate point in the touch area and the corresponding coordinate point in the initial display image based on the correspondence between the coordinate information of each calibration point in the projection image after distortion correction on the projection screen and the coordinate information of the touch area formed by the detection light in the second detection module on the projection screen; Determine the coordinate information of the effective touch area based on the coordinate information of the touch area formed by the detection light in the second detection module on the projection screen and the coordinate information of each calibration point of the projection screen on the projection screen; Acquire first coordinate information detected by the second detection module, where the first coordinate information is coordinate information corresponding to a first touch operation occurring in the touch area; When the first coordinate information is within the coordinate threshold of the effective touch area, the first operation instruction on the initial display screen data corresponding to the first touch operation is determined according to the first coordinate information and the correspondence between the coordinate information of the touch area on the projection screen and the initial display screen data, and the projection unit is controlled to perform the operation corresponding to the first operation instruction.

16. An electronic device, characterized in that: The electronic device comprises: A memory storing executable instructions; A processor, wherein the processor runs the executable instructions in the memory to implement the method according to any one of claims 11 to 15.

17. A computer storage medium, characterized in that: A computer program is stored on the medium, and the computer program is executed by a processor to implement the method according to any one of claims 11 to 15.

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