A laser scanning projection synchronization signal correction device and method

Abstract

The application discloses a laser scanning projection synchronous signal correction device and method, which comprises a controller, a first synchronous signal line and a second synchronous signal line; a laser scanning projection device, which comprises a scanning galvanometer and a light outlet; the scanning galvanometer is connected with the second synchronous signal line and changes different angle light beams under the control of the controller and projects out from the light outlet; and an optical sensing device, which comprises a beam splitter, a lens group and a linear sensor; the beam splitter is arranged corresponding to the light outlet of the laser scanning projection device; the beam splitter reflects the light beam of the light outlet and reflects it to the lens group; the lens group focuses the light beam and focuses it to the linear sensor; when the linear sensor detects the focused light beam, it outputs a signal Opt-Sync to the controller through the first synchronous signal line; and the controller outputs a synchronous signal to the scanning galvanometer.

Description

Technical Field

[0001] This invention relates to the field of scanning projection technology, and in particular to a laser scanning projection synchronization signal correction device and method. Background Technology

[0002] Laser scanning projection is a method of projection using laser technology. It uses a laser beam to scan and project images or video content. The principle of laser scanning projection is that a laser beam emitted from a laser is focused and adjusted by an optical system before being projected onto a high-speed rotating scanning mirror. The movement of the scanning mirror changes the direction of the laser beam, thereby achieving scanning of space. By controlling the scanning speed and direction of the laser beam, continuous images can be formed on the target surface; therefore, it has been widely used in projection-related fields.

[0003] However, the synchronization signal currently controlled by the scanning galvanometer is generally transmitted using a capacitive sensor. This type of sensor is easily affected by the surrounding environment when transmitting signals, such as electromagnetic waves, temperature, and transmission line impedance, which makes the synchronization signal unstable and causes abnormal jitter in the projected image. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a laser scanning projection synchronization signal correction device to correct the interference of the synchronization signal, stabilize the synchronization signal, and prevent the projected image from jittering.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A laser scanning projection synchronization signal correction device, comprising:

[0007] The controller includes a first synchronization signal line and a second synchronization signal line.

[0008] A laser scanning projection device includes a scanning galvanometer and a light output port. The scanning galvanometer is connected to a second synchronization signal line. The scanning galvanometer is controlled by a controller to change the beam angle and project it out from the light output port.

[0009] An optical sensing device includes a beam splitter, a lens group, and a linear sensor. The beam splitter is positioned corresponding to the light output port of the laser scanning projection device. The beam splitter reflects the light beam from the light output port and onto the lens group. The lens group focuses the light beam onto the linear sensor. When the linear sensor detects the focused light beam, it outputs a signal Opt-Sync to the controller via a first synchronization signal line. The controller outputs a synchronization signal to the scanning galvanometer.

[0010] Preferably, the beam splitter is a BSN04 beam splitter.

[0011] Preferably, the lens group is a 33-856 fixed-focus lens.

[0012] Preferably, the linear sensor is a TCD1304DG linearity sensor.

[0013] Preferably, the controller is configured as a scanning projection controller.

[0014] A method for correcting a laser scanning projection synchronization signal includes:

[0015] The beam splitter reflects part of the beam to the lens group, which focuses the beam and directs it to the linear sensor. When the linear sensor detects the focused beam, it outputs the Opt-Sync signal to the controller through the first synchronization signal line.

[0016] The controller outputs either an undisturbed synchronization signal or an undisturbed synchronization signal. Both the undisturbed and undisturbed synchronization signals include horizontal and vertical synchronization signals. When the controller outputs an undisturbed synchronization signal, the following equation is used based on the controller's timing diagram:

[0017] Obtain the corrected horizontal synchronization signal and the corrected vertical synchronization signal;

[0018] After correcting the horizontal synchronization signal and the vertical synchronization signal, the signal is output to the scanning galvanometer. The scanning galvanometer then adjusts the beam according to different angles and projects the beam through the output port.

[0019] Preferably, in the equation, Δt H and Δt V These represent the time differences between the undisturbed horizontal synchronization signal, the undisturbed vertical synchronization signal, and Opt-Sync, respectively; Δt' H and Δt' V These represent the time differences between the interfered horizontal synchronization signal, the interfered vertical synchronization signal, and Opt-Sync, respectively; T H For the horizontal synchronization signal that is being interfered with, T V T' is the time of the disturbed vertical synchronization signal. H To correct the timing of the horizontal synchronization signal, T' V To correct the timing of the vertical synchronization signal.

[0020] The technical solution of this invention has the following beneficial effects:

[0021] This invention, through an optical sensing device and a controller, can correct the horizontal and vertical synchronization signals input to a laser scanning projection device, thereby preventing the horizontal and vertical synchronization signals from being disturbed by external electromagnetic waves, temperature, transmission line impedance, etc., that is, the synchronization signals are stable, the laser scanning projection device projects a stable beam, and the projected image will not exhibit abnormal jitter. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a timing diagram of the controller of the present invention;

[0024] Figure 3 This is a schematic diagram of the controller and laser scanning projection device of the present invention. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] In this invention, unless otherwise expressly specified and limited, the first feature is "on" or "on" the second feature.

[0030] The term "below" can include situations where the first and second features are in direct contact, or situations where the first and second features are in contact through another feature between them. Furthermore, "above," "over," and "on top" of the first feature above the second feature includes situations where the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of the first feature below the second feature includes situations where the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] Reference Figure 1 As shown, the present invention provides a laser scanning projection synchronization signal correction device, comprising:

[0032] Controller 50, the controller including a first synchronization signal line 40 and a second synchronization signal line 30:

[0033] A laser scanning projection device 20 includes a scanning galvanometer and a light output port. The scanning galvanometer is connected to a second synchronization signal line 30. The scanning galvanometer is controlled by a controller to change the beam angle and project it out from the light output port.

[0034] An optical sensing device 100 includes a beam splitter 60, a lens group 70, and a linear sensor 80. The beam splitter 60 is positioned corresponding to the light output port of the laser scanning projection device 20. The beam splitter 60 reflects the light beam 15 from the light output port and onto the lens group 70. The lens group 70 focuses the light beam 16 onto the linear sensor 80. When the linear sensor 80 detects the focused light beam 16, it outputs an Opt-Sync signal to the controller 50 through the first synchronization signal line 40. The controller outputs a synchronization signal to the scanning galvanometer.

[0035] Specifically, refer to Figure 1 , Figure 3As shown, the laser scanning projection device 20 projects light beams 14, 14a, and 14b from the light output port at different angles; light beams 15, 15a, and 15b are light beams 14. 14a and 14b are reflected light beams through the beam splitter 60 and then focused onto the linear sensor 80 through the lens group 70. When the linear sensor 80 detects the focused light beam 16, it outputs the Opt-Sync signal to the controller 50 through the first synchronization signal line 40. When the synchronization signal is unstable, it is corrected by the controller 50 and then output to the laser scanning projection device 20 through the second synchronization signal line 30 and projected onto the projection screen 110.

[0036] The beam splitter 60 can be a Thorlabs BSN04 beam splitter with 90% transmittance and 10% reflectance. The 10% reflected light is incident on a lens group 70, using an Edmund 33-856 fixed-focus lens, to converge the scanning beam incident on the lens onto the linear sensor 80. The linear sensor 80 used here is a Toshiba TCD1304DG linearity sensor. When the linearity sensor detects a light source, it transmits a signal Opt-Sync to the device controller 50.

[0037] like Figure 1 ,like Figure 2 As shown, in this embodiment, a laser scanning projection synchronization signal correction method includes:

[0038] The beam splitter reflects part of the beam to the lens group, which focuses the beam and directs it to the linear sensor. When the linear sensor detects the focused beam, it outputs the Opt-Sync signal to the controller through the first synchronization signal line.

[0039] The controller 50 outputs an undisturbed synchronization signal or an undisturbed synchronization signal. Both the undisturbed and undisturbed synchronization signals include horizontal and vertical synchronization signals. When the controller 50 outputs an undisturbed synchronization signal, the following equation is used based on the timing diagram of the controller 50:

[0040] Obtain the corrected horizontal synchronization signal and the corrected vertical synchronization signal;

[0041] After correcting the horizontal synchronization signal and the vertical synchronization signal, the signal is output to the scanning galvanometer. The scanning galvanometer then adjusts the beam according to different angles and projects the beam through the light outlet.

[0042] In the equation, Δt H and Δt V These represent the time differences between the undisturbed horizontal synchronization signal, the undisturbed vertical synchronization signal, and Opt-Sync, respectively; Δt'H and Δt' V These represent the time differences between the interfered horizontal synchronization signal, the interfered vertical synchronization signal, and Opt-Sync, respectively; T H For the horizontal synchronization signal that is being interfered with, T V T' is the time of the disturbed vertical synchronization signal. H To correct the timing of the horizontal synchronization signal, T' V To correct the timing of the vertical synchronization signal.

[0043] Specifically, refer to Figure 2 As shown, 500 and 600 are H-Sync (uninterrupted horizontal synchronization signal) and V-Sync (uninterrupted vertical synchronization signal) respectively, while 510 and 610 are H-Sync (interrupted horizontal synchronization signal) and V-Sync (interrupted vertical synchronization signal) respectively.

[0044] Opt-Sync 700 is the synchronization signal for the optical sensor, Δt H and Δt V These represent the time differences between uninterrupted H-Sync and V-Sync and Opt-Sync, respectively, while Δt' H and Δt' V These represent the time differences between H-Sync and V-Sync and Opt-Sync, respectively, when interference occurred.

[0045] like Figure 3 As shown, in this embodiment, a laser scanning projection device includes: a laser scanning projection device 20; an R light source 1, a G light source 2, and a B light source 3 are light source devices of the laser scanning projection device 20, and beams 10, 11, and 12 are beams emitted by the R light source 1, the G light source 2, and the B light source 3, respectively; filters 4, 5, and 6 are respectively configured to correspond to the R light source 1, the G light source 2, and the B light source 3, and are used to combine beams 10, 11, and 12 into beam 13; a scanning mirror 7 is configured to correspond to beam 13, and a light outlet 8 is configured to correspond to the scanning mirror 7. The beam 13 changes angle via the scanning mirror 7 and outputs a reflected beam 14 from the light outlet 8; the beam 14 is then used to project onto a screen to form a projection.

[0046] In addition, the controller 50 inputs synchronization signals to the scanning galvanometer 7 through the horizontal synchronization signal line 31 and the vertical synchronization signal line 32, so that the scanning galvanometer 7 changes its angle, thereby projecting the beam 14 from different angles. The controller 50 controls the R light source 1, the G light source 2, and the B light source 3 through the control signal line 33, the control signal line 34, and the control signal line 35.

[0047] Specifically, in this embodiment, a laser scanning projection synchronization signal correction device is used (see reference). Figure 1 When correcting the synchronization signal of laser scanning projection (refer to...) Figure 2 The laser scanning projection device 20 is equipped with a beam splitter 60, a lens group 70, and a linear sensor 80. The beam splitter 60 is set to correspond to the light output port 8 of the laser scanning projection device 20. The beam splitter 60 collects the light beam 15 from the light output port and reflects it to the lens group 70. The lens group 70 focuses the light beam 16 and focuses it to the linear sensor 80. When the linear sensor 80 detects the focused light beam 16, it outputs the Opt-Sync signal to the controller 50 through the first synchronization signal line 40.

[0048] Again, through reference Figure 2 As shown, controller 50 outputs an undisturbed synchronization signal or an undisturbed synchronization signal. Both the undisturbed and undisturbed synchronization signals include horizontal and vertical synchronization signals. When the controller outputs an undisturbed synchronization signal, then according to the timing diagram of controller 50 and the following equations:

[0049] The horizontal and vertical synchronization signals are corrected, and then the horizontal and vertical synchronization signals are used to input synchronization signals to the scanning galvanometer 7 through the horizontal synchronization signal line 31 and the vertical synchronization signal line 32, so that the scanning galvanometer 7 can change its angle and project the beam 14 from different angles. The corrected synchronization signals can also be used to stabilize the beam projection and prevent image jitter.

[0050] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A laser scanning projection synchronization signal correction device, characterized in that, include: The controller includes a first synchronization signal line and a second synchronization signal line, the second synchronization signal line including a horizontal synchronization signal line and a vertical synchronization signal line; a laser scanning projection device includes a scanning galvanometer and a light output port, the scanning galvanometer being connected to the second synchronization signal line to change the angle of the light beam under the control of the controller and project it through the light output port; an optical sensing device includes a beam splitter, a lens group, and a linear sensor, the beam splitter being positioned corresponding to the light output port and used to sample the light beam projected through the light output port and reflect the sampled light beam to the lens group, the lens group being used to focus the sampled light beam onto the linear sensor, the linear sensor outputting an optical synchronization signal Opt-Sync to the controller through the first synchronization signal line when detecting the focused light beam; wherein, the controller is configured to: output an undisturbed synchronization signal or output an undisturbed synchronization signal, the synchronization signal including a horizontal synchronization signal and a vertical synchronization signal; when outputting an undisturbed synchronization signal, a corrected horizontal synchronization signal and a corrected vertical synchronization signal are obtained based on pre-stored timing parameters and combined with the following equation: T' H = T H + (Δt H - Δt' H );T' V = T V + (Δt V - Δt' V ); where Δt H and Δt V These represent the time differences between the undisturbed horizontal synchronization signal, the undisturbed vertical synchronization signal, and Opt-Sync, respectively; Δt' H and Δt' V These represent the time differences between the interfered horizontal synchronization signal, the interfered vertical synchronization signal, and Opt-Sync, respectively; T H T represents the time of the disturbed horizontal synchronization signal. V T' is the time of the interfered vertical synchronization signal. H To correct the timing of the horizontal synchronization signal, T' V To correct the vertical synchronization signal timing, the controller outputs the corrected horizontal synchronization signal and the corrected vertical synchronization signal to the scanning galvanometer via the second synchronization signal line.

2. The laser scanning projection synchronization signal correction device according to claim 1, characterized in that, The beam splitter is a BSN04 beam splitter.

3. The laser scanning projection synchronization signal correction device according to claim 2, characterized in that, The lens group is set as a 33-856 fixed focal length lens.

4. The laser scanning projection synchronization signal correction device according to claim 3, characterized in that, The linear sensor is set as a TCD1304DG linear sensor.

5. The laser scanning projection synchronization signal correction device according to claim 1, characterized in that, The controller is set as a scanning projection controller.

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