Laser projection system

Abstract

The embodiment of the invention provides a laser projection system, projection pictures corresponding to at least two laser projection devices are spliced into a projection image, and when the laser projection system carries out image fusion, a master controller of each laser projection device outputs a video signal and a configuration signal including fusion area configuration information. The display controller generates a brightness adjusting signal and a light modulation signal according to the video signal and the configuration signal, and the brightness adjuster adjusts the brightness of the light beam projected to the fusion area according to the brightness adjusting signal, so that the brightness of the adjusted light beam is gradually reduced in the fusion area in the direction from the non-fusion area to the fusion area. When the light valve uses the light modulation signal to demodulate the light beam to generate the projection image, the brightness of the projection image is complementary with the image brightness of the adjacent display image in the fusion area and is not influenced by off light, so that the brightness uniformity of the image projected by the laser projection system is ensured.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of projection display technology, and in particular to a laser projection system. Background Art

[0002] In the multi-laser projection image fusion application scenario, in order to achieve seamless image display, an overlapping area, namely the fusion area, is generally set between two adjacent images, and the other areas of the image are non-fusion areas.

[0003] When the laser projection device displays images under ideal conditions, the optical mirrors in the light valve will display images according to the brightness design of the fused image, so that the brightness of the fused area and the non-fused area remains consistent. However, since part of the off light reflected by the optical mirrors will enter the lens, the energy of the off light reaching the fused area and the non-fused area may be different; in addition, there are gaps between the optical mirrors in the light valve, and some of the off light may enter the lens, resulting in uneven brightness of the fused image.

[0004] Furthermore, when displaying dark scenes or black images, the light mirror flips very few times or not at all, and the light mirror continuously reflects the off light so that the off light is obtained in the lens, resulting in the brightness of the fused area being higher than that of the non-fused area, and the brightness of the fused image being uneven.

[0005] Therefore, how to solve the problem of uneven brightness of multi-laser projection images has become the focus of research. Summary of the invention

[0006] The present application provides a laser projection system to solve the technical problem of uneven brightness of multi-laser projection images.

[0007] In a first aspect, an embodiment of the present application provides a laser projection system, the laser projection system comprising at least two laser projection devices, the laser projection device forms a projection screen by reflecting a projection image formed by a light valve, the projection screens respectively corresponding to the at least two laser projection devices are spliced ​​into a projection image, the intersecting area of ​​two adjacent projection screens is a fusion area, and the non-intersecting area is a non-fusion area;

[0008] In each of the laser projection devices, it includes:

[0009] A main controller, configured to output a video signal and a configuration signal; the configuration signal includes fusion area configuration information;

[0010] A display controller, electrically connected to the main controller, configured to generate a brightness adjustment signal and a light modulation signal according to the video signal and the configuration signal;

[0011] a brightness adjuster, electrically connected to the display controller, and configured to adjust the brightness of the light beam projected onto the fusion area according to the brightness adjustment signal; the brightness of the adjusted light beam decreases in the fusion area from the non-fusion area to the fusion area, and the minimum brightness of the light beam is less than a preset brightness threshold;

[0012] The light valve is electrically connected to the display controller and is configured to perform light modulation on the adjusted light beam according to the light modulation signal to generate a projection image.

[0013] In the above technical scheme, when the laser projection system performs image fusion, the main controller of each laser projection device outputs a video signal and a configuration signal including fusion area configuration information. The display controller generates a brightness adjustment signal and a light modulation signal according to the video signal and the configuration signal. The brightness adjuster adjusts the brightness of the light beam projected to the fusion area according to the brightness adjustment signal, so that the brightness of the adjusted light beam decreases in the fusion area from the non-fusion area to the fusion area. When the light valve uses the light beam and the light modulation signal to generate a projected image, it complements the increasing image brightness of the adjacent display screen in the fusion area and will not be affected by the off light, thereby ensuring that the brightness of the picture projected by the laser projection system is uniform. In addition, since when a low-brightness picture is displayed in the fusion area, the brightness of the light beam provided by the brightness adjuster is also reduced, which reduces the light energy and improves the utilization rate of the light source.

[0014] In a feasible embodiment, adjusting the brightness of the light beam projected by the projection light source to the fusion area according to the brightness adjustment signal includes:

[0015] According to the brightness adjustment signal, the phase of the light wave in the light beam projected to the fusion area is adjusted to adjust the brightness of the light beam.

[0016] In a feasible embodiment, the display controller includes an algorithm processing module and a digital light processing module;

[0017] The algorithm processing module is electrically connected to the main controller and the brightness adjuster, and is configured to generate a brightness adjustment signal for the fusion area according to the fusion area configuration information; the fusion area configuration information includes fusion area width, light intensity gradient, and frame cutting data;

[0018] The digital light processing module is electrically connected to the main controller and the light valve, and is configured to generate the light modulation signal according to the video signal.

[0019] In a feasible embodiment, the digital light processing module is electrically connected to the algorithm processing module, and is configured to generate a synchronization signal and transmit the synchronization signal to the algorithm processing module; the synchronization signal includes a synchronization signal of each color channel;

[0020] The algorithm processing module is configured to generate a corresponding brightness adjustment sub-signal according to the synchronization signal of each color channel, and the brightness adjustment signal includes a brightness adjustment sub-signal corresponding to each color channel.

[0021] In the above technical solution, in the display controller, by setting an algorithm processing module that independently processes the configuration information of the fusion area, not only the computing power of the digital light processing module is saved and the efficiency of the digital light processing module in controlling the light valve is guaranteed, but also the brightness adjustment signal for controlling the backlight modulation of the fusion area can be generated in time, and the light beam can be adjusted by the brightness adjuster in time to provide the required light beam for the light valve. At the same time, the algorithm processing module and the digital light processing module are synchronized through the signal to ensure the time consistency of the dimming process of the light valve and the light beam projected thereon, thereby preventing display errors.

[0022] In a feasible embodiment, the display controller includes an algorithm processing module;

[0023] The algorithm processing module is electrically connected to the main controller and the brightness adjuster, and is configured to generate a brightness adjustment signal for the projection image according to the video signal and the configuration signal;

[0024] The brightness adjuster is also configured to adjust the phase of the light wave in the light beam projected to the non-fusion area according to the brightness adjustment signal, and the brightness of the adjusted light beam in the non-fusion area is determined according to the original light intensity of the projection light source and the video data corresponding to the light beam.

[0025] In a feasible embodiment, the display controller further includes a digital light processing module;

[0026] The algorithm processing module is electrically connected to the digital light processing module and is configured to transmit the video signal to the digital light processing module;

[0027] The digital light processing module is electrically connected to the light valve and is configured to generate the light modulation signal according to the video signal.

[0028] In the above technical solution, in the display controller, by setting an algorithm processing module that separately processes the fusion area configuration information, not only the computing power of the digital light processing module is saved and the efficiency of the digital light processing module in controlling the light valve is guaranteed, but also the brightness adjustment signal for controlling the backlight modulation of each area of ​​the display screen can be generated in time, and the brightness adjuster can be used to adjust the light in time to provide the required light beam for the light valve, so as to improve the processing speed of the display controller. In addition, because the algorithm processing module controls the brightness adjuster to adjust the brightness of all light beams projected to the light valve, the backlight brightness corresponding to the low grayscale image can be reduced, thereby further improving the utilization rate of the light source.

[0029] In a feasible embodiment, the digital light processing module is further configured to obtain the fusion area configuration information, and generate a fusion area light modulation signal according to the fusion area configuration information and the video signal; the light modulation signal includes the fusion area light modulation signal, and the fusion area light modulation signal includes a first target flip duty cycle of the light mirror corresponding to the fusion area in the light valve in a frame display period;

[0030] The fusion dimming coefficient of the first target flip duty cycle and the corresponding first original flip duty cycle decreases in a direction from the non-fusion area to the fusion area;

[0031] The first original flip duty cycle is the duty cycle of the optical mirror corresponding to the first target flip duty cycle in the optical modulation signal generated by the digital light processing module according to the video signal.

[0032] In a feasible embodiment, the configuration signal further includes a non-fusion area dimming coefficient;

[0033] The digital light processing module is also configured to generate a non-fusion area light modulation signal according to the non-fusion area dimming coefficient and the video signal, wherein the light modulation signal includes the non-fusion area light modulation signal, and the non-fusion area light modulation signal includes a second target flipping duty cycle of the light mirror corresponding to the non-fusion area in the light valve in the frame display period.

[0034] In the above technical solution, the digital light processing module also adjusts the target flip duty cycle of each mirror in the light valve according to the video signal to adjust the brightness of the fusion area or the entire display screen with higher precision to improve the quality of the display screen.

[0035] In a feasible embodiment, the display controller further includes: a storage unit;

[0036] The storage unit is configured to store the brightness adjustment signal.

[0037] In a feasible embodiment, the main controller is configured to determine a fusion area processing mode when the laser projection device is powered on; the fusion area processing mode includes a fusion area dimming mode or a fusion area non-dimming mode;

[0038] When the fusion area processing mode includes the fusion area dimming mode, outputting the video signal and the configuration signal;

[0039] When the fusion area processing mode includes the fusion area non-dimming mode, the algorithm processing module is controlled to read the brightness adjustment signal from the storage unit and transmit the brightness adjustment signal to the brightness adjuster.

[0040] In the above technical solution, a storage unit is set in the display controller to store the brightness adjustment signal generated by the algorithm processing module when the main controller is in the fusion area dimming mode, so that when the main controller is in the fusion area non-dimming mode, the data stored in the storage unit is directly called to ensure uniform brightness of the display picture.

[0041] An embodiment of the present application provides a laser projection system, which includes at least two laser projection devices. The projection pictures corresponding to the at least two laser projection devices are spliced ​​into a projection image. When the laser projection system performs image fusion, the main controller of each laser projection device outputs a video signal and a configuration signal including fusion area configuration information. The display controller generates a brightness adjustment signal and a light modulation signal according to the video signal and the configuration signal. The brightness adjuster adjusts the brightness of the light beam projected to the fusion area according to the brightness adjustment signal, so that the brightness of the adjusted light beam decreases from the non-fusion area to the fusion area in the fusion area. When the light valve uses the light beam and the light modulation signal to generate a projection image, the image brightness that increases in the fusion area is complementary to that of the adjacent display picture, and will not be affected by the off light, thereby ensuring that the brightness of the picture projected by the laser projection system is uniform. In addition, since when a low-brightness picture is displayed in the fusion area, the brightness of the light beam provided by the brightness adjuster is also reduced, which reduces the light energy and improves the utilization rate of the light source. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0043] Figure 1 This is an application scenario diagram of a laser projection system provided by the present application according to an exemplary embodiment;

[0044] Figure 2 A schematic diagram of the structure of a laser projection device provided by the present application according to an exemplary embodiment;

[0045] Figure 3 A schematic diagram of a circuit system framework of a laser projection device provided by the present application according to an exemplary embodiment;

[0046] Figure 4 A schematic diagram of image fusion provided by the present application according to an exemplary embodiment;

[0047] Figure 5A schematic diagram of image fusion provided by the present application according to another exemplary embodiment;

[0048] Figure 6 A schematic diagram of the structure of a laser projection device provided by the present application according to an exemplary embodiment;

[0049] Figure 7 A schematic structural diagram of a laser projection device provided according to another exemplary embodiment of the present application;

[0050] Figure 8 A schematic structural diagram of a laser projection device provided according to another exemplary embodiment of the present application;

[0051] Fig. 9 A fusion schematic diagram provided by the present application according to an exemplary embodiment;

[0052] Fig.10 A fusion schematic diagram provided by the present application according to another exemplary embodiment;

[0053] Fig.11 A schematic diagram of the change of backlight intensity in different areas of a projection screen according to an exemplary embodiment of the present application.

[0054] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0055] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0056] It should be noted that, in this article, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "include one..." do not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, the parts, features, and elements with the same names in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context in the specific embodiment. It should be further understood that the terms "include", "comprise" indicate the existence of features, steps, operations, elements, components, projects, types, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, types, and / or groups.

[0057] In the description of the present disclosure, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The terms "or" and "and / or" are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way.

[0058] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0059] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0060] Figure 1 This is an application scenario diagram of a laser projection system provided by the present application according to an exemplary embodiment, such as Figure 1As shown, a user can operate multiple laser projection devices 10 in the laser projection system through a smart device 1003 or a control device 1005 , so that the multiple laser projection devices 10 project images or videos onto a screen 1000 .

[0061] Among them, when the laser projection system projects a projection image on the screen 1000, each laser projection device 10 projects a part of the projection screen of the projection image on the screen 1000, and sets an overlapping area between two adjacent images, that is, a fusion area 1001. The two adjacent images display the same image in the fusion area to achieve image connection. Multiple projection screens are spliced ​​on the screen 1000 to form a complete projection image.

[0062] In some embodiments, the control device 1005 may be a remote controller, and the communication between the remote controller and the laser projection device 10 includes infrared protocol communication or Bluetooth protocol communication, and other short-distance communication methods, and the laser projection device 10 is controlled wirelessly or wired. The user can control the laser projection device 10 by inputting user commands through buttons on the remote controller, voice input, control panel input, etc.

[0063] In some embodiments, a smart device 1003 (such as a mobile terminal, a tablet computer, a computer, a laptop computer, etc.) may also be used to control the laser projection device 10. For example, the laser projection device 10 is controlled using an application running on the smart device.

[0064] In some embodiments, the laser projection device 10 may not use the above-mentioned smart device or control device to receive instructions, but may receive user control through gestures or the like.

[0065] In some embodiments, the laser projection device 10 can also be controlled in ways other than the control device 1005 and the smart device 1003. For example, the user's voice command control can be directly received through a module for obtaining voice commands configured inside the laser projection device 10, or the user's voice command control can be received through a voice control device set outside the laser projection device 10.

[0066] In some embodiments, the laser projection device 10 also communicates data with the server 1004. The laser projection device 10 may be allowed to communicate via a local area network (LAN), a wireless local area network (WLAN), and other networks. The server 1004 may provide various content and interactions to the laser projection device 10. The server 1004 may be a cluster or multiple clusters, and may include one or more types of servers.

[0067] Figure 2 This is a schematic diagram of the structure of a laser projection device provided by the present application according to an exemplary embodiment. Figure 2As shown, after the upper shell of the laser projection device 10 is disassembled, the internal structure is divided according to the optical function, and may include a light source 100, an optical machine 200, a lens 300, and a power supply 400, wherein the light source 100 is used to provide a light source illumination beam, which is transmitted to the rear-end optical modulation device and the projection lens. The light source 100 may include a laser of at least one color, such as a blue laser, or a two-color laser, such as a blue laser and a red laser, or a three-color laser light source, including red, green, and blue lasers, for providing a three-color laser illumination beam.

[0068] The laser beam provided by the light source 100 enters the illumination optical path of the optical machine 200 after light combination and shaping. In the optical machine 200, the light valve (Digital Micromirror Device, DMD) chip is the core light modulation device. The DMD chip receives the driving control signal corresponding to the image signal, and flips the thousands of tiny mirrors on its surface to the positive or negative angle corresponding to the driving signal, and reflects the light beam irradiating its surface into the lens 300.

[0069] The lens 300 may be an ultra-short-throw projection lens, and the ultra-short-throw projection lens 300 is used to project an image beam onto a projection screen, thereby realizing projection image display. The laser projection device in the above example may be an ultra-short-throw laser projection device.

[0070] More specifically, the circuit system framework diagram of the laser projection device 10 is as follows: Figure 3 As shown, it includes: a detector 20, a main controller 30, an external device interface 40, a display controller 50, a communicator 70, a power supply unit 400, a light source unit 100, an optical machine module 200, a lens unit 300, a light source driving unit 504, a display driver 505, a memory, and at least one of a user interface. In some embodiments, the display controller 50 includes a digital light processing module 501, an algorithm processing module 502, and a storage unit 503.

[0071] The power supply unit 400 is configured to provide power to the entire laser projection device 10 , and generally outputs DC 36V, 12V, 18V, etc., wherein the power supply unit 400 provides a DC 36V electrical signal to the light source driving unit 504 and provides a DC 12V electrical signal to the display controller 50 .

[0072] The main controller 30 is disposed on the TV board and is configured to decode data of different formats obtained from various input signal sources into a normalized format, and transmit the decoded video signal and the configuration signal preset in the main controller 30 to the display controller 50 .

[0073] The display controller 50 is configured to generate a control signal according to the video signal and the configuration signal, and transmit the control signal to the DMD 201 in the optical-mechanical module 200 .

[0074] More specifically, in the display controller 50 , the digital light processing module 501 mainly includes a digital light processing chip (Digital Light Processing, DLP), and may also include a driving chip.

[0075] In the DLP control architecture, the light source part needs to cooperate with the working timing of the DLP chip and the DMD chip. Specifically, the DLP chip outputs an image enable signal, which can also be called a primary color light enable signal, usually expressed as X_EN, where X is the abbreviation of different primary color lights, and also outputs a brightness adjustment signal, referred to as a PWM signal. Along with the DMD chip's sequential modulation process of different primary color image components, the light source part needs to synchronously output the primary color light beams of the corresponding colors. That is, the DLP chip outputs a primary color light enable signal to notify the laser light source to enable the lighting of a certain color laser, and outputs a PWM signal to notify a certain laser in the laser light source to light up at what brightness.

[0076] Corresponds to Figure 3 As shown, the digital light processing module 501 is configured to generate a modulated driving signal for driving the DMD 201 according to the image signal to be displayed, on the one hand, and on the other hand, since the display of the projection image requires the synchronous coordination of the light source light beam and the light modulation device, the light source driving unit 504 also generates a driving signal for driving the light source to emit light. The driving signal can be called an initial driving signal, including two specific driving signals, an image enable signal EN and a current PWM signal. Among them, the image enable signal EN is a timing control signal for coordinating the timing of light output of different colors, and the current PWM signal is a square wave signal for providing a current signal for lighting the laser.

[0077] The display driver 505 is configured to receive the image enable signal EN and the current PWM signal output by the digital light processing module 501, and specifically control the lighting of the light source unit 100. The light source unit 100 may include a laser that generates one color, or may include lasers that generate multiple colors, and a corresponding light source driver unit 504 is provided for each color of the laser.

[0078] The algorithm processing module 502 is electrically connected to the digital light processing module 501 and is configured to process the input video image signal. In one embodiment, the algorithm processing module 502 is a field programmable gate array (FPGA), and its processing of the video image signal includes but is not limited to: performing MEMC frequency multiplication processing, or image correction, etc. to realize image enhancement functions.

[0079] It should be noted that FPGA usually exists as an enhanced function module. In some low-cost solutions, this module may not be provided, and the digital light processing module 501 receives and processes the video signal output by the main controller 30 .

[0080] The optical-mechanical module 200 is configured to receive the laser signal from the light source unit 100 , and after the laser signal is irradiated to the DMD 201 , an image is formed.

[0081] The DMD 201 is electrically connected to the display driver 505 through a DMD socket and a DMD adapter board, and is configured to receive a video timing control signal and a DMD control signal, and adjust the angle of the optical mirror according to the obtained signals.

[0082] More specifically, DMD 201 is provided with optical mirrors distributed in an array. When the optical mirror is in the on state, the laser projected onto the optical mirror is reflected by the optical mirror to the lens unit to form an image on the projection surface; when the optical mirror is in the off state, the laser projected onto the optical mirror will be projected into the area outside the lens unit in the form of off light, for example: onto the optical machine housing.

[0083] The lens unit 300 is configured to receive the image of the light valve 200, magnify it, and finally project it onto a target object, which may be a screen, a wall, or the like.

[0084] When a multi-laser projection device displays a projection image, the image fusion diagram of the projection image is as follows: Figure 4As shown, the figure is an image fusion of the first projection screen P1 and the second projection screen P2, wherein P11 and P12 are uniform laser beams obtained by the DMD of the laser projection device displaying the first projection screen P1, and P21 and P22 are uniform laser beams obtained by the DMD of the laser projection device displaying the second projection screen P2. P13 and P14 are schematic diagrams of the display screen after the light mirror is flipped and modulated in the DMD of the laser projection device displaying the first projection screen P1, wherein P13 is an image of a non-fused area, and P14 is an image of a fused area. P23 ​​and P24 are schematic diagrams of the display screen after the light mirror is flipped and modulated in the DMD of the laser projection device displaying the second projection screen P2, wherein P23 is an image of a non-fused area, and P24 is an image of a fused area. Among them, the images displayed in P14 and P24 are the same, and the images in the fused gradient area are superimposed to obtain the final projection screen P3, wherein P31 is the image after the superposition of P12, P22, P14, and P24.

[0085] During the superposition of the above areas, the adjustment ratio of the light mirror flipping time in P14 is gradually increased from left to right until the light mirror stops flipping at the far right; the adjustment ratio of the light mirror flipping time in P24 is gradually increased from right to left until the light mirror stops flipping at the far left. Ideally, when P14 and P24 display the image corresponding to the same pixel, the superimposed light intensity should be the normal display light intensity.

[0086] Since part of the off light reflected by the optical mirror will enter the lens, the energy of the off light reaching the fusion area and the non-fusion area may be different; in addition, there are gaps between the optical mirrors in the light valve, and part of the off light may enter the lens, resulting in uneven brightness of the fusion image.

[0087] When the projection image displayed by the laser projection device 10 is a low-brightness image or a black image, the optical mirror is flipped a few times or not at all, and the optical mirror continuously reflects the off light so that the off light is obtained in the lens, so that the brightness unevenness between the overlapping area and other areas is particularly obvious, such as Figure 5 As shown, after the fourth image P33 and the fifth image P32 are fused, the brightness of the image displayed in the fused area P31 is significantly higher than the brightness of the areas on both sides thereof, so that a light band exists in the overall display image, affecting the viewing experience.

[0088] Therefore, how to solve the problem of uneven brightness of multi-laser projection images in laser projection systems has become a research focus.

[0089] In order to solve the above problems, the present application provides a laser projection system. The technical concept of the present application is to adjust the brightness of the image displayed in the fusion area by adjusting the brightness of the light beam projected on the light valve, thereby ensuring uniform brightness of the multi-laser projected image.

[0090] The laser projection system provided in the present application includes at least two laser projection devices. The laser projection device forms a projection screen by reflecting the projection image formed by the light valve. The projection screens corresponding to the at least two laser projection devices are spliced ​​into a projection image. The area where two adjacent projection screens intersect is a fusion area, and the area where two adjacent projection screens do not intersect is a non-fusion area.

[0091] The laser projection device provided by the present application is explained below.

[0092] Figure 6 This is a schematic diagram of the structure of a laser projection device provided by the present application according to an exemplary embodiment. Figure 6 As shown, the laser projection device includes:

[0093] The main controller 30 is configured to output a video signal and a configuration signal, wherein the configuration signal includes fusion area configuration information, which is configuration information determined according to the position of the laser projection device in the laser projection device, preset locally, and associated with the fusion area.

[0094] The display controller 50 is electrically connected to the main controller 30 , and is configured to generate a brightness adjustment signal and a light modulation signal according to the video signal and the configuration signal, and also generate a light source control signal.

[0095] The light source unit 100 is electrically connected to the main controller 30, and is configured to generate a corresponding projection light source according to the light source control signal, and project the projection light source to the brightness adjuster 60. In one embodiment, the projection light source is a laser.

[0096] The brightness adjuster 60 is electrically connected to the display controller 50. The device contains a plurality of micron-sized reflective micromirrors. The reflective surface of each micromirror is a plane and can be moved up and down in a direction perpendicular to the reflective surface. The phase relationship between the light incident on each micromirror is changed by the up and down displacement of the micromirrors. Since the laser is coherent light, when the propagation distance of the laser changes, the phase changes, and diffraction is formed, thereby adjusting the light intensity distribution of the image plane. In the actual display effect, the light in the dark area of ​​the picture can be "moved" to the bright area, making the bright area brighter and the dark area changed, thereby realizing local adjustment of the high dynamic range backlight. In one embodiment, the brightness adjuster 60 is a PLM chip.

[0097] The brightness adjuster 60 is configured to adjust the brightness of the light beam projected to the fusion area according to the brightness adjustment signal. The brightness of the adjusted light beam decreases in the fusion area from the non-fusion area to the fusion area, and the minimum brightness of the light beam is less than a preset brightness threshold.

[0098] More specifically, the brightness adjuster 60 adjusts the phase of the light wave in the light beam projected to the fusion area according to the brightness adjustment signal to adjust the brightness of the light beam. That is, when the laser projection device displays a dark scene image or a black scene, the brightness of the light beam projected to the optical mirror corresponding to the fusion area is very low or there is no light beam, so as to prevent the fusion area from being affected by the off light.

[0099] In one embodiment, the brightness adjuster 60 does not project a light beam to the edge of the blending area, that is, does not provide backlight to the edge.

[0100] The light valve 200 is electrically connected to the display controller 50 and is configured to perform light modulation on the adjusted light beam according to the light modulation signal to generate a projection image. That is, the light beam reflected to the lens unit 300 is determined by adjusting the flipping duty cycle of each light mirror in the frame display period to generate a projection image.

[0101] The lens unit 300 is configured to project the projection image generated by the light valve 200 onto the screen.

[0102] In the above technical scheme, when the laser projection system performs image fusion, the main controller of each laser projection device outputs a video signal and a configuration signal including fusion area configuration information. The display controller generates a brightness adjustment signal and a light modulation signal according to the video signal and the configuration signal. The brightness adjuster adjusts the brightness of the light beam projected to the fusion area according to the brightness adjustment signal, so that the brightness of the adjusted light beam decreases in the fusion area from the non-fusion area to the fusion area. After the light valve uses the light beam and the light modulation signal to generate a projected image, it complements the image brightness of the adjacent display screen that increases in the fusion area and will not be affected by the off light, thereby ensuring that the brightness of the picture projected by the laser projection system is uniform. In addition, since the brightness of the light beam provided by the brightness adjuster is also reduced when a low-brightness picture is displayed in the fusion area, the light energy is reduced and the utilization rate of the light source is improved.

[0103] More specifically, the display controller 50 includes an algorithm processing module 501 and a digital light processing module 502. There are two ways of connecting the above two modules with other units or components in the laser projection device, which are described below respectively.

[0104] Figure 7 FIG. 1 is a schematic structural diagram of a laser projection device provided according to another exemplary embodiment of the present application. Figure 7 As shown, the display controller 50 includes an algorithm processing module 501 , a digital light processing module 502 and a storage unit 503 .

[0105] The algorithm processing module 501 is electrically connected to the main controller 30 and the brightness adjuster 60, and is configured to generate a brightness adjustment signal for the projection screen according to the video signal and the configuration signal. The video signal is transmitted to it by the main controller 30 via a V-By-One signal, and the configuration signal is transmitted by the main controller 30 via an I2C bus or a USB line.

[0106] More specifically, for the fusion area, the algorithm processing module 501 is configured to obtain the fusion area width, light intensity gradient, and border clipping data from the fusion area configuration information of the configuration signal, and generate a brightness adjustment signal for the fusion area based on the above data.

[0107] In this embodiment, since the algorithm processing module 501 can obtain the video signal, the brightness adjustment signal generated by it includes not only the brightness adjustment signal for the fusion area, but also the brightness adjustment signal for the non-fusion area.

[0108] The process of the brightness adjuster 60 dimming the brightness of the fusion area according to the brightness adjustment signal has been explained in the above embodiment and will not be repeated here.

[0109] When dimming is performed in response to the brightness adjustment signal of the non-fusion area, the brightness adjuster 60 is configured to modulate the phase of the light wave in the light beam projected to the non-fusion area according to the brightness adjustment signal of the non-fusion area, and the brightness of the adjusted light beam in the non-fusion area is determined based on the original light intensity of the projection light source and the video data corresponding to the light beam.

[0110] The algorithm processing module 501 is electrically connected to the digital light processing module 502, and is also configured to transmit the video signal to the digital light processing module 502. In one embodiment, the algorithm processing module 501 also transmits the video signal to the digital light processing module 502 via a V-By-One signal.

[0111] The digital light processing module 502 is electrically connected to the brightness adjuster 60 and is configured to generate a bias voltage corresponding to each color channel according to the video signal.

[0112] The brightness adjuster 60 includes a plurality of reflective mirrors with adjustable heights, and is configured to adjust the extendable range of each reflective mirror according to a bias voltage, and adjust the phase of the light wave in the light beam of the color channel corresponding to the bias voltage.

[0113] The digital light processing module 502 is further configured to generate a synchronization signal and transmit the synchronization signal to the algorithm processing module. The synchronization signal includes a synchronization signal of each color channel.

[0114] The algorithm processing module 501 is configured to generate a corresponding brightness adjustment sub-signal according to the synchronization signal of each color channel, and the brightness adjustment signal includes the brightness adjustment sub-signal corresponding to each color channel.

[0115] The algorithm processing module and the digital light processing module use synchronization signals to ensure the time consistency between the dimming process of the light valve and the light beam projected thereon, thus preventing display errors.

[0116] The digital light processing module 502 is electrically connected to the light valve 200 and is configured to generate a light modulation signal according to the video signal.

[0117] The storage unit 503 is electrically connected to the algorithm processing module 503 and is configured to store the brightness adjustment signal.

[0118] The main controller 30 is configured to determine a fusion area processing mode when the laser projection device is powered on; the fusion area processing mode includes a fusion area dimming mode or a fusion area non-dimming mode.

[0119] When the fusion area processing mode includes a fusion area dimming mode, outputting a video signal and a configuration signal;

[0120] When the fusion area processing mode includes the fusion area non-dimming mode, the control algorithm processing module reads the brightness adjustment signal from the storage unit and transmits the brightness adjustment signal to the brightness adjuster.

[0121] In the above technical solution, in the display controller, by setting an algorithm processing module that separately processes the fusion area configuration information, not only the computing power of the digital light processing module is saved and the efficiency of the digital light processing module in controlling the light valve is guaranteed, but also the brightness adjustment signal for controlling the backlight modulation of each area of ​​the display screen can be generated in time, and the light beam can be adjusted by the brightness adjuster in time to provide the required light beam for the light valve, so as to improve the processing speed of the display controller. In addition, because the algorithm processing module controls the brightness adjuster to adjust the brightness of all light beams projected to the light valve, the backlight brightness corresponding to the low grayscale image can be reduced, thereby further improving the utilization rate of the light source.

[0122] Figure 8 FIG. 1 is a schematic structural diagram of a laser projection device provided according to another exemplary embodiment of the present application. Figure 8 As shown, the display controller 50 includes an algorithm processing module 501 , a digital light processing module 502 and a storage unit 503 .

[0123] and Figure 7 The circuit connection relationship shown is different in that the algorithm processing module 501 only obtains the configuration signal transmitted by the main controller. The algorithm processing module 501 is configured to generate a brightness adjustment signal for the fusion area according to the fusion area configuration information. The fusion area configuration information includes the fusion area width, light intensity gradient, and border cropping data.

[0124] The digital light processing module 502 is electrically connected to the main controller 30 . The video signal obtained by the digital light processing module 502 is directly obtained from the main controller 30 . The digital light processing module 502 is configured to generate a light modulation signal according to the video signal.

[0125] Other connections and Figure 7 The embodiments shown are the same and will not be described again here.

[0126] In the above technical solution, in the display controller, by setting an algorithm processing module that separately processes the fusion area configuration information, not only the computing power of the digital light processing module is saved and the efficiency of the digital light processing module in controlling the light valve is guaranteed, but also the brightness adjustment signal for controlling the backlight modulation of the fusion area can be generated in time, and the brightness adjuster can be used to modulate the light in time to provide backlight for the light valve.

[0127] In use Figure 7 and Figure 8 When dimming is performed in the corresponding embodiment, the fusion diagram of the projection image generated by the laser projection device is as follows: Fig. 9 As shown in the figure, the image fusion of the first projection screen P1 and the second projection screen P2, wherein P11 and P21 are the backlights of the non-fusion area, and P12 and P22 are the backlights of the fusion area. When the whole image displays the same light intensity, the light intensity of the backlights of the two fusion areas gradually decreases toward the edge of the image. The schematic diagram of the change of the light intensity is shown in Fig.11 shown.

[0128] P13 and P14 are schematic diagrams of the display screen after the light mirror in the DMD of the laser projection device displaying the first projection screen P1 is flipped, wherein P13 is the non-fusion area image, and P14 is the fusion area image. P23 ​​and P24 are schematic diagrams of the display screen after the light mirror in the DMD of the laser projection device displaying the second projection screen P2 is flipped, wherein P23 is the non-fusion area image, and P24 is the fusion area image. Among them, the screens displayed in P14 and P24 are the same, and the images in the fusion gradient area are superimposed to obtain the final projection screen P3, wherein P31 is the screen after P12, P22, P14, and P24 are superimposed. Among them, P14 and P15 do not modulate the DMD.

[0129] Furthermore, the digital light processing module 502 is also configured to obtain fusion area configuration information, and generate a fusion area light modulation signal according to the fusion area configuration information and the video signal; the light modulation signal includes the fusion area light modulation signal, and the fusion area light modulation signal includes the first target flip duty cycle of the light mirror corresponding to the fusion area in the light valve in the frame display period.

[0130] The fusion dimming coefficient of the first target flip duty cycle and the corresponding first original flip duty cycle decreases in a direction from the non-fusion area to the fusion area.

[0131] The first original flip duty cycle is the duty cycle of the optical mirror corresponding to the first target flip duty cycle in the optical modulation signal generated by the digital light processing module according to the video signal.

[0132] The configuration signal also includes non-blended local dimming coefficients.

[0133] The digital light processing module 502 is also configured to generate a non-fusion area light modulation signal based on the non-fusion area dimming coefficient and the video signal, the light modulation signal including the non-fusion area light modulation signal, the non-fusion area light modulation signal including the second target flip duty cycle of the light mirror corresponding to the non-fusion area in the light valve in the frame display period.

[0134] When dimming is performed using this embodiment, a fusion diagram of the projection image generated by the laser projection device is shown in FIG. Fig.10 As shown, Fig. 9 Compared with the schematic diagram shown, the light mirrors of display P14 and P24 in the DMD will also be modulated, and the closer to the edge, the greater the degree of modulation. In this way, on the basis of backlight adjustment, the adjustment accuracy can be further improved by adjusting the light emission time to improve the quality of the displayed image.

[0135] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0136] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A laser projection system, characterized in that: The laser projection system comprises at least two laser projection devices, wherein the laser projection devices form a projection screen by reflecting the projection image formed by the light valve, and the projection screens respectively corresponding to the at least two laser projection devices are spliced ​​into a projection image, and the intersecting area of ​​two adjacent projection screens is a fusion area, and the non-intersecting area is a non-fusion area; In each of the laser projection devices, it includes: A main controller, configured to output a video signal and a configuration signal; the configuration signal includes fusion area configuration information; A display controller, electrically connected to the main controller, configured to generate a brightness adjustment signal and a light modulation signal according to the video signal and the configuration signal; a brightness adjuster, electrically connected to the display controller, and configured to adjust the brightness of the light beam projected onto the fusion area according to the brightness adjustment signal; the brightness of the adjusted light beam decreases in the fusion area from the non-fusion area to the fusion area, and the minimum brightness of the light beam is less than a preset brightness threshold; The light valve is electrically connected to the display controller and is configured to perform light modulation on the adjusted light beam according to the light modulation signal to generate a projection image.

2. The laser projection system according to claim 1, characterized in that: The step of adjusting the brightness of the light beam projected from the projection light source to the fusion area according to the brightness adjustment signal includes: According to the brightness adjustment signal, the phase of the light wave in the light beam projected to the fusion area is adjusted to adjust the brightness of the light beam.

3. The laser projection system according to claim 1 or 2, characterized in that: The display controller includes an algorithm processing module and a digital light processing module; The algorithm processing module is electrically connected to the main controller and the brightness adjuster, and is configured to generate a brightness adjustment signal for the fusion area according to the fusion area configuration information; The fusion area configuration information includes fusion area width, light intensity gradient, and frame cutting data; The digital light processing module is electrically connected to the main controller and the light valve, and is configured to generate the light modulation signal according to the video signal.

4. The laser projection system according to claim 3, characterized in that: The digital light processing module is electrically connected to the algorithm processing module and is configured to generate a synchronization signal and transmit the synchronization signal to the algorithm processing module; the synchronization signal includes a synchronization signal of each color channel; The algorithm processing module is configured to generate a corresponding brightness adjustment sub-signal according to the synchronization signal of each color channel, and the brightness adjustment signal includes a brightness adjustment sub-signal corresponding to each color channel.

5. The laser projection system according to claim 1 or 2, characterized in that: The display controller includes an algorithm processing module; The algorithm processing module is electrically connected to the main controller and the brightness adjuster, and is configured to generate a brightness adjustment signal for the projection image according to the video signal and the configuration signal; The brightness adjuster is also configured to adjust the phase of the light wave in the light beam projected to the non-fusion area according to the brightness adjustment signal, and the brightness of the adjusted light beam in the non-fusion area is determined according to the original light intensity of the projection light source and the video data corresponding to the light beam.

6. The laser projection system according to claim 5, characterized in that: The display controller also includes a digital light processing module; The algorithm processing module is electrically connected to the digital light processing module and is configured to transmit the video signal to the digital light processing module; The digital light processing module is electrically connected to the light valve and is configured to generate the light modulation signal according to the video signal.

7. The laser projection system according to claim 4 or 6, characterized in that: The digital light processing module is further configured to obtain the fusion area configuration information, and generate a fusion area light modulation signal according to the fusion area configuration information and the video signal; the light modulation signal includes the fusion area light modulation signal, and the fusion area light modulation signal includes a first target flipping duty cycle of the light mirror corresponding to the fusion area in the light valve in a frame display period; The fusion dimming coefficient of the first target flip duty cycle and the corresponding first original flip duty cycle decreases in a direction from the non-fusion area to the fusion area; The first original flip duty cycle is the duty cycle of the optical mirror corresponding to the first target flip duty cycle in the optical modulation signal generated by the digital light processing module according to the video signal.

8. The laser projection system according to claim 7, characterized in that: The configuration signal also includes a non-fusion area dimming coefficient; The digital light processing module is also configured to generate a non-fusion area light modulation signal according to the non-fusion area dimming coefficient and the video signal, wherein the light modulation signal includes the non-fusion area light modulation signal, and the non-fusion area light modulation signal includes a second target flipping duty cycle of the light mirror corresponding to the non-fusion area in the light valve in the frame display period.

9. The laser projection system according to claim 4 or 6, characterized in that: The digital light processing module is electrically connected to the brightness adjuster and is configured to generate a bias voltage corresponding to each color channel according to the video signal; The brightness adjuster includes a plurality of reflective mirrors with adjustable heights, and is configured to adjust the extendable range of each of the reflective mirrors according to the bias voltage, and adjust the phase of the light wave in the light beam of the color channel corresponding to the bias voltage.

10. The laser projection system according to claim 4 or 6, characterized in that: The display controller further includes: a storage unit; The storage unit is configured to store the brightness adjustment signal.

11. The laser projection system according to claim 10, characterized in that: The main controller is configured to determine a fusion area processing mode when the laser projection device is powered on; The fusion area processing mode includes a fusion area dimming mode or a fusion area non-dimming mode; When the fusion area processing mode includes the fusion area dimming mode, outputting the video signal and the configuration signal; When the fusion area processing mode includes the fusion area non-dimming mode, the algorithm processing module is controlled to read the brightness adjustment signal from the storage unit and transmit the brightness adjustment signal to the brightness adjuster.

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