Laser projection device and laser projection display method

Abstract

The present application belongs to the technical field of display. Provided are a laser projection device and a laser projection display method. A video processing component generates a phase video signal on the basis of a received video signal, sends the phase video signal to an optical phase modulation device and sends a video signal to a display driving component; the display driving component sends to a laser driving component a first dimming signal within a first time period and a second dimming signal within a second time period, and sends a display driving signal to an optical amplitude modulation component; the laser driving component drives a light source component to emit a primary color light beam to the optical phase modulation device within the first time period, and drives the light source component not to emit any primary color light beam within the second time period; the optical phase modulation device performs phase modulation on the primary color light beam and emits modulated light to the optical amplitude modulation component; and the optical amplitude modulation component adjusts the modulated light to obtain a projection light beam, wherein the projection light beam is used for projection display. In this way, the display effect of the laser projection device can be improved.

Description

Laser projection device and laser projection display method

[0001] The present application claims priority to the Chinese patent application No. 202410865939.8, filed on June 28, 2024, and entitled “Laser projection device and laser projection display method”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the field of display technology. More specifically, embodiments of the present application relate to a laser projection device and a laser projection display method. BACKGROUND

[0003] A laser projection device can project an image on a projection screen (referred to as a screen) to realize video playing and other functions. For a laser projection device, it is a key part to improve user experience to realize a high-dynamic range (HDR) display effect.

[0004] Currently, an amplitude light modulation component is usually added in a laser projection device, so that the display effect of the laser projection device is improved by two amplitude light modulation components.

[0005] However, after adding the amplitude light modulation component, the laser projection device still has the problem of poor display effect. SUMMARY

[0006] Exemplary embodiments of the present application provide a laser projection device and a laser projection display method, which can improve the display effect of the laser projection device.

[0007] In a first aspect, the present application provides a laser projection device, comprising a video processing component, a display driving component, a laser driving component, a light source component, a phase light modulation device, and an amplitude light modulation component.

[0008] The video processing component is configured to generate a phase video signal according to a received video signal, and send the phase video signal to the phase light modulation device and the video signal to the display driving component.

[0009] The display driving component is configured to send a dimming signal to the laser driving component and a display driving signal to the amplitude light modulation component according to the video signal, the dimming signal comprising a first dimming signal in a first time period and a second dimming signal in a second time period.

[0010] The laser driving assembly is configured to drive the light source assembly to emit a primary color light beam to the phase light modulation device in the first time period according to the first dimming signal, and drive the light source assembly to not emit the primary color light beam and not emit a primary color light beam of another color in the second time period according to the second dimming signal, wherein the another color is a color other than the color of the primary color light beam;

[0011] The phase light modulation device is configured to perform phase modulation on the primary color light beam according to the phase video signal, and emit modulated light to the amplitude light modulation assembly;

[0012] The amplitude light modulation assembly is configured to adjust the modulated light according to the display driving signal to obtain a projection light beam, and the projection light beam is used for projection display.

[0013] In a second aspect, the application provides a laser projection display method, which is applied to a laser projection device, and the laser projection device comprises a video processing assembly, a display driving assembly, a laser driving assembly, a light source assembly, a phase light modulation device, and an amplitude light modulation assembly.

[0014] The video processing assembly is configured to generate a phase video signal according to a received video signal, and send the phase video signal to the phase light modulation device and send the video signal to the display driving assembly;

[0015] The display driving assembly is configured to send a dimming signal to the laser driving assembly and send a display driving signal to the amplitude light modulation assembly according to the video signal, and the dimming signal comprises a first dimming signal in a first time period and a second dimming signal in a second time period;

[0016] The laser driving assembly is configured to drive the light source assembly to emit a primary color light beam to the phase light modulation device in the first time period according to the first dimming signal, and drive the light source assembly to not emit the primary color light beam and not emit a primary color light beam of another color in the second time period according to the second dimming signal, wherein the another color is a color other than the color of the primary color light beam;

[0017] The phase light modulation device is configured to perform phase modulation on the primary color light beam according to the phase video signal, and emit modulated light to the amplitude light modulation assembly;

[0018] The amplitude light modulation assembly is configured to adjust the modulated light according to the display driving signal to obtain a projection light beam, and the projection light beam is used for projection display.

[0019] In a third aspect, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program, and the computer program, when executed by a laser projection device, implements the steps of the laser projection display method.

[0020] In a fourth aspect, a computer program product containing instructions, which, when executed on a laser projection device, causes the laser projection device to perform the steps of the laser projection display method.

[0021] The technical solutions provided by the embodiments of the present application can bring at least the following beneficial effects:

[0022] In the embodiments of the present application, the phase light modulation device and the amplitude light modulation assembly are combined to sequentially perform phase modulation and amplitude modulation on the laser beam to be projected, the diffraction effect of phase modulation is used to improve the brightness dynamic range of the laser beam, and the HDR display effect is improved, and the loss of the laser is reduced. The timing of light emission of the light source assembly, the timing of phase modulation of the phase light modulation device, and the timing of amplitude modulation of the amplitude light modulation assembly are controlled to match the timing of the light source assembly, the phase light modulation device, and the amplitude light modulation assembly, solve the problem of different refresh rates of the phase light modulation device and the amplitude light modulation assembly, ensure accurate phase modulation and amplitude modulation, and ensure accurate projection. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the implementation manners in the related art, the drawings needed in the embodiment or related art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0024] FIG. 1 is a schematic diagram of an amplitude light modulation assembly modulating a light beam according to an embodiment of the present application;

[0025] FIG. 2 is a schematic diagram of a phase light modulation device modulating a light beam according to an embodiment of the present application;

[0026] FIG. 3 is a schematic diagram of using a phase light modulation device and an amplitude light modulation assembly for projection imaging according to an embodiment of the present application;

[0027] FIG. 4 is a schematic diagram of a laser projection device according to an embodiment of the present application;

[0028] FIG. 5 is a structural schematic diagram of a laser projection device according to an embodiment of the present application;

[0029] FIG. 6 is a structural schematic diagram of another laser projection device according to an embodiment of the present application;

[0030] FIG. 7 is a structural schematic diagram of another laser projection device according to an embodiment of the present application;

[0031] FIG. 8 is a structural schematic diagram of a video processing component according to an embodiment of the present application;

[0032] FIG. 9 is a schematic diagram of a display timing corresponding relationship between an amplitude light modulation component and a phase light modulation device according to an embodiment of the present application;

[0033] FIG. 10 is a schematic diagram of a timing relationship between a light source component and a phase light modulation device according to an embodiment of the present application;

[0034] FIG. 11 is a schematic diagram of a timing relationship between a light source component and a phase light modulation device according to another embodiment of the present application;

[0035] FIG. 12 is a schematic diagram of a timing relationship between a light source component and a phase light modulation device according to another embodiment of the present application;

[0036] FIG. 13 is a schematic diagram of a light emitting timing of a light source component according to an embodiment of the present application;

[0037] FIG. 14 is a schematic diagram of a timing relationship between a light source component and a phase light modulation device when a black insertion period is added according to an embodiment of the present application;

[0038] FIG. 15 is a schematic diagram of a light emitting timing of a light source component according to another embodiment of the present application;

[0039] FIG. 16 is a schematic diagram of a timing relationship between a light source component, a phase light modulation device and an amplitude light modulation component according to an embodiment of the present application;

[0040] FIG. 17 is a schematic diagram of a timing relationship between a light source component, a phase light modulation device and an amplitude light modulation component after a black insertion period is added according to an embodiment of the present application;

[0041] FIG. 18 is a schematic diagram of a timing relationship between a light source component and a phase light modulation device when the refresh times of the phase light modulation device is 2 according to an embodiment of the present application;

[0042] FIG. 19 is a schematic diagram of a light emitting timing of a light source component when the refresh times of the phase light modulation device is 2 according to an embodiment of the present application;

[0043] FIG. 20 is a schematic diagram of a timing relationship between a light source component and a phase light modulation device when the refresh times of the phase light modulation device is 2 according to another embodiment of the present application;

[0044] FIG. 21 is a schematic diagram of a light emitting timing of a light source component when the refresh times of the phase light modulation device is 2 according to another embodiment of the present application;

[0045] FIG. 22 is a timing sequence diagram of a light source assembly, a phase light modulating device, and an amplitude light modulating assembly without a black insertion period according to an embodiment of the present application;

[0046] FIG. 23 is a timing sequence diagram of a light source assembly, a phase light modulating device, and an amplitude light modulating assembly with a black insertion period according to an embodiment of the present application;

[0047] FIG. 24 is a timing sequence diagram of a light source assembly, a phase light modulating device, and an amplitude light modulating assembly without a black insertion period according to another embodiment of the present application;

[0048] FIG. 25 is a timing sequence diagram of a light source assembly, a phase light modulating device, and an amplitude light modulating assembly with a black insertion period according to another embodiment of the present application;

[0049] FIG. 26 is a flow diagram of a laser projection display method according to an embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to make the objects, implementation manners and advantages of the present application clearer, the following will clearly and completely describe the exemplary embodiments of the present application with reference to the accompanying drawings of the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0051] It should be noted that the brief description of the terms in the present application is only for the convenience of understanding the following described embodiments, and is not intended to limit the embodiments of the present application. Unless otherwise specified, these terms should be understood according to their ordinary and general meanings.

[0052] In addition, the terms "comprise" and "have" and any variations thereof are intended to cover but not exclusive inclusion, for example, a product or device comprising a series of components does not have to be limited to the clearly listed components, but can include other components that are not clearly listed or inherent to these products or devices.

[0053] The laser projection device, such as a laser television, a laser projector, etc., can project an image on a projection screen to realize video playing and the like. For the laser projection device, realizing the HDR display effect is a more key part to improve the user experience.

[0054] The light source panel of the liquid crystal television includes a plurality of backlight partitions, and the backlight brightness can be adjusted through the plurality of backlight partitions, so as to realize the local adjustment of the backlight brightness and the HDR display. However, the laser projection device is limited by the light source form, and cannot realize the HDR display in the same way as the liquid crystal television.

[0055] The laser projection device can implement HDR display in the following two possible manners:

[0056] In a possible implementation, an amplitude light modulation component (also referred to as an amplitude light modulation device, an amplitude modulation component, an amplitude modulation device, etc.) is additionally added to the laser projection device, so that the laser projection device includes two amplitude light modulation components. When the laser projection device projects an image, a light beam emitted by a light source component (referredably referred to as a light source, also referred to as a laser light source, a laser, etc.) is modulated by a first amplitude light modulation component, the modulated light beam is incident on a second amplitude light modulation component, and the light beam modulated by the second amplitude light modulation component can be projected on a projection screen to form an image.

[0057] FIG. 1 is a schematic diagram of modulation of a light beam by an amplitude light modulation component according to an embodiment of the present application. As shown in FIG. 1, the amplitude light modulation component includes a plurality of light modulation units, each of which includes a micro-mirror (also referred to as a light modulation mirror, a mirror, a micro-pixel, etc.) and a driving component. The driving component is configured to drive the corresponding micro-mirror to perform angular deflection. The deflection angle has two states: one is on, that is, the modulated light can be reflected to a target position (for example, a projection screen); and the other is off, that is, the modulated light is not allowed to be reflected to the target position (for example, the projection screen).

[0058] It should be understood that FIG. 1 is used only to explain the working principle of the amplitude light modulation component, and in the above possible implementation, the laser projection device can include two amplitude light modulation components as shown in FIG. 1.

[0059] In the amplitude light modulation component, the on-off time of each micro-mirror can be controlled by the driving component to adjust the light intensity distribution of the modulated light. For example, according to the brightness information of different regions in a to-be-projected image (also referred to as a to-be-displayed image, a projection screen, a projection image, a display image, a display screen, etc.), part of the micro-mirrors in the first amplitude light modulation component can be controlled to reflect the modulated light to the projection screen, and another part of the micro-mirrors can be controlled not to reflect the modulated light to the projection screen. The micro-mirrors that reflect the modulated light to the projection screen correspond to bright regions in the to-be-projected image, and the reflected modulated light is referred to as bright-field light. The micro-mirrors that do not reflect the modulated light to the projection screen correspond to dark regions in the to-be-projected image, and the reflected modulated light is referred to as dark-field light. In this way, after modulation by the first amplitude light modulation component, the dark-field light is discarded, and only the bright-field light is reflected to the second amplitude light modulation component for display.

[0060] Based on FIG. 1, the above possible implementation can realize local adjustment of backlight brightness by greatly reducing dark field brightness, thereby realizing high dynamic range display effect. However, this kind of possible implementation has poor practicability, can only increase the brightness dynamic range by reducing the brightness, and cannot improve the peak brightness, and the light efficiency is particularly low.

[0061] In another possible implementation, a phase light modulation device (also referred to as a phase light modulation assembly, a phase modulation assembly, a phase modulation device, a phase light modulation module, etc.) is added in the laser projection device. When the laser projection device projects an image, the light beam emitted by the light source assembly first passes through the phase light modulation device for modulation, and the obtained modulated light beam (referred to as modulated light for short) is incident on the amplitude light modulation assembly, and then the modulated light beam is modulated by the amplitude light modulation assembly. The light beam obtained after the modulation of the amplitude light modulation assembly can be projected and imaged on the projection screen.

[0062] The phase light modulation device is shown in FIG. 2, which is a schematic diagram of the phase light modulation device for modulating a light beam according to an embodiment of the present application.

[0063] Based on FIG. 2, the phase light modulation device includes a plurality of light modulation units, and each light modulation unit includes a plurality of micron-level micromirrors (also referred to as light modulation mirrors, mirrors, micro-pixel points, etc.) and a driving assembly. The reflecting surface of each micromirror is a plane, and can move up and down in a direction perpendicular to the reflecting surface. The driving assembly is used to drive the corresponding micromirror to move in a direction perpendicular to the reflecting surface of the micromirror, so as to change the height of the reflecting surface of the micromirror, thereby changing the optical path of the incident light beam, and further changing the phase of the incident light beam. In this way, the phase light modulation device can change the phase relationship between the light rays incident on each micromirror through the up-down displacement of the micromirrors. Since the light beam used in the laser projection device is laser light, and laser light is coherent light, through the joint action of the plurality of micromirrors of the phase light modulation device, the entire incident light field can be phase-modulated, and when the phase is changed, diffraction is formed at the exit light field, thereby realizing adjustment of the light intensity distribution of the image plane. Through phase modulation, the light corresponding to the dark area of the image to be projected can be "moved to" the bright area, so that the bright area is brighter and the dark area is darker, thereby realizing local adjustment of the backlight brightness in a high dynamic range.

[0064] The micromirrors on the phase light modulation device can change the phase of the incident light, and the joint action of the plurality of micromirrors causes the light beam corresponding to the image to be diffracted to realize redistribution of the light intensity, so that the bright field part is brighter and the dark field part is darker. Moreover, the light loss of the light beam after the modulation of the phase light modulation device is small or even there is no light loss.

[0065] FIG. 3 is a schematic diagram of using a phase light modulation device and an amplitude light modulation assembly for projection imaging according to an embodiment of the present application.

[0066] As shown in FIG. 3, when projection imaging is performed using a phase light modulation device (such as a phase modulation (PLM) device) and an amplitude light modulation assembly (such as a digital micromirror device (DMD)), the effect of the projected image is clearer compared to using only the phase light modulation device, and the HDR display of the laser projection device can be achieved. Moreover, after the light beam is modulated using the phase light modulation device, the brightness of the image main body region is improved, the brightness of the background region is relatively low, and the brightness dynamic range of the projected image is expanded.

[0067] In this way, the laser projection device can take the picture displayed by the amplitude light modulation assembly as the target of light field intensity redistribution, and the input phase map information required by the phase light modulation device can be obtained by performing phase recovery operation on the picture. The phase light modulation device is driven by using the phase map information. When the phase light modulation device and the amplitude light modulation assembly are synchronously displayed, the light intensity of the light beam on the corresponding region of the amplitude light modulation assembly is the highest in the region with high brightness in the image to be projected, and the light intensity of the light beam on the corresponding region of the amplitude light modulation assembly is relatively low in the region with low brightness in the image to be projected. Through real-time synchronous display, the HDR projection display of the laser projection device can be achieved. The efficiency of this possible implementation method is relatively high, the light in the dark field can be "transported" to the bright field, and the waste of the light source is reduced.

[0068] However, in this possible implementation method, the laser projection device has a large difference in driving mode between the amplitude light modulation assembly and the phase light modulation device when performing projection display. The refresh rate, data loading time, and micro-mirror action time of the two are quite different, and thus the timing matching of the light source assembly, the amplitude light modulation assembly, and the phase light modulation device may be disordered, resulting in display problems such as low light source efficiency, discontinuous gray scale, and color deviation in the white field. Moreover, when the laser projection device is imaged by using a single-chip three-color laser amplitude light modulation assembly display technology, the single-chip laser display system mainly uses the high refresh rate and rapid micro-mirror action characteristics of the amplitude light modulation assembly to time-division multiplex the lighting timing of the displayed primary color light. After the primary color light is modulated by the amplitude light modulation assembly, each primary color image is displayed, and the display speed is extremely fast. The human eye forms a color image due to the visual persistence effect when viewing. Therefore, the laser projection device using the single-chip three-color laser amplitude light modulation assembly display technology is more likely to cause poor display effect due to timing disorder.

[0069] Therefore, in the above two possible implementation methods, the display effect of the laser projection device is poor, and the user experience is poor. In the first possible implementation method, the light is wasted more, and in the second possible implementation method, the timing matching problem needs to be solved.

[0070] Based on this, the embodiment of the present application provides a laser projection device. When the laser projection device projects a display image, for a color of primary light beams, the light source assembly is controlled by a light modulation signal to emit the color of primary light beams in a time period, and the light source assembly is controlled not to emit any color of primary light beams in another time period. When the light source assembly emits a color of primary light beams, the phase light modulation device has reached a state of phase modulation of the primary light beams, the color of primary light beams can be modulated, and the amplitude light modulation assembly can adjust the modulated light modulated by the phase light modulation device. When the display image is projected, the light source assembly, the amplitude light modulation assembly and the phase light modulation device are more matched, the timing disorder due to mismatching can be reduced, and the display effect of the laser projection device can be improved.

[0071] In order to better understand the embodiment of the present application, first, the structure of the laser projection device of the embodiment of the present application is introduced.

[0072] FIG. 4 is a schematic diagram of a laser projection device provided by the embodiment of the present application. As shown in FIG. 4, after the upper shell of the laser projection device is disassembled, the internal structure is divided according to optical functions, and can include a light source assembly 100, an optical engine 200 and a lens 300. The light source assembly 100 is used to provide light beams, which are transmitted to the rear-end phase light modulation device, the amplitude light modulation assembly and the projection lens. The light source assembly 100 can include at least one color of light source assembly, such as a blue light source assembly, or a two-color light source assembly, such as a light source assembly including blue and red colors, or a three-color light source assembly, including red, green and blue light source assemblies, which are used to provide three-color laser beams.

[0073] In some embodiments, the phase light modulation device and the amplitude light modulation assembly can be devices in the optical engine 200. In other embodiments, the phase light modulation device can be a device in the light source assembly 100, and the amplitude light modulation assembly can be a device in the optical engine 200. That is, the embodiment of the present application does not limit the affiliation and setting position of each device.

[0074] The laser beams provided by the light source assembly 100 are incident into the illumination light path part in the optical engine 200 after being combined and shaped. In the DLP projection architecture, the amplitude light modulation assembly chip is the core light modulation device.

[0075] Exemplarily, the amplitude light modulation component can be a digital micro-mirror chip (DMD), a liquid crystal on silicon (LCOS), a liquid crystal display (LCD), or any other projection display chip. The phase light modulation component can be a PLM or any other phase modulation component.

[0076] The amplitude light modulation component can receive a display driving signal corresponding to an image signal, and flip the micro-mirrors on its surface according to the display driving signal to reflect the light beam irradiating on its surface into the lens 300.

[0077] The lens 300 can be an ultra-short focus projection lens or any other projection lens, and is configured to project the image light beam onto a projection screen to realize projection image display. The laser projection device in the above example can be an ultra-short focus laser projection device, or any other laser projection device, which is not limited in the embodiments of the present application.

[0078] Referring to FIG. 4, the laser projection device can further include a board assembly 400, which can include a main control board (containing a main control chip) and a display board or any other circuit board, which is not limited in the embodiments of the present application.

[0079] In combination with the above embodiments, the structure of the laser projection device during projection imaging is described below, taking a system of a single-chip PLM and a single-chip DMD as an example. As shown in FIG. 5, FIG. 5 is a structural schematic diagram of a laser projection device according to an embodiment of the present application.

[0080] As shown in FIG. 5, the optical engine in the laser projection device can include a light source assembly 100, a phase light modulation component 101, an amplitude light modulation component 102, and a lens 300. The light source assembly 100 can be a three-color laser, and can emit light in a time sequence.

[0081] As shown in FIG. 5, the light sources of the three-color laser in the light source assembly 100 are lit out by a time sequence order. When the monochromatic laser is irradiated onto the phase light modulation device 101, the phase light modulation device 101 can modulate the phase of the monochromatic laser according to the image content to be displayed, change the phase through the up-down displacement of the micro-mirror, and obtain the modulated light. The modulated light can be input to the surface of the amplitude light modulation assembly 102, and the modulated light is further subjected to pulse width modulation (PWM) by the amplitude light modulation assembly 102, so that the diffraction light intensity of the corresponding image bright area is strong, and the diffraction light intensity of the corresponding image dark area is weak, thereby realizing local adjustment of the backlight and improving the display effect. The light beam modulated by the amplitude light modulation assembly 102 is projected onto the projection screen through the lens 300, and an image is formed on the projection screen, thereby realizing the HDR display of the laser projection device.

[0082] In the embodiment of the present application, the light intensities of at least two light beams in the light beam modulated by the phase light modulation device 101 are different, so that the brightness difference between at least two image partitions in the projected image can be enlarged, thereby the dynamic contrast of the projected image can be improved without changing the brightness of the light source and without processing the projected image, and then the display effect of the image projected onto the projection screen through the lens 300 can be improved. It should be understood that the light intensities of the at least two light beams herein mean that the light intensities of at least two light beam partitions in the light beam modulated by the phase light modulation device 101 are different, one light beam partition refers to a region in the complete light beam modulated by the phase light modulation device 101, at least two light beams refer to at least two regions in the complete light beam, in order to facilitate description, the at least two light beam partitions are referred to as at least two light beams in the above, which does not mean that the light beam modulated by the phase light modulation device 101 is composed of multiple independent light beams, and the light beam modulated by the phase light modulation device 101 can be one.

[0083] In the structural schematic diagram shown in FIG. 3, a lens is arranged between the phase light modulation device and the amplitude light modulation assembly, and in the structural schematic diagram shown in FIG. 5, no lens is shown between the phase light modulation device and the amplitude light modulation assembly, which does not mean that there is no lens between the two, nor means that there is only one lens between the two. It should be understood that FIG. 3 and FIG. 5 are used to indicate the transmission path of the light beam, and are not used to limit the device structure, and other structural diagrams in the embodiments of the present application are similar. For example, in some embodiments, one or more lenses (which can be convex lenses, concave lenses, etc.) can be included between the phase light modulation device and the amplitude light modulation assembly, and a light barrel can also be included, or other optical assemblies can also be included.

[0084] In combination with the description of FIG. 5, the following describes the structure of the laser projection device for controlling the light source assembly 100 to light, controlling the phase light modulation device 101 to modulate the light beam, and controlling the amplitude light modulation assembly 102 to adjust the modulated light. For details, refer to FIG. 6, which is a structural schematic diagram of another laser projection device provided in an embodiment of the present application.

[0085] As shown in FIG. 6, the laser projection device includes a video processing assembly 103, a display driving assembly 104, a laser driving assembly 105, the light source assembly 100, the phase light modulation device 101, the amplitude light modulation assembly 102, and a lens 300.

[0086] The video processing assembly 103 is configured to generate a phase video signal according to a received video signal, and send the phase video signal to the phase light modulation device and send the video signal to the display driving assembly 104.

[0087] The display driving assembly 104 is configured to send a dimming signal to the laser driving assembly 105 and a display driving signal to the amplitude light modulation assembly 102 according to the video signal. The dimming signal includes a first dimming signal in a first time period and a second dimming signal in a second time period.

[0088] The laser driving assembly 105 is configured to drive the light source assembly 100 to emit a primary color light beam to the phase light modulation device 101 in the first time period according to the first dimming signal, and drive the light source assembly 100 to not emit the primary color light beam and not emit a light beam of another color in the second time period according to the second dimming signal. The another color is a color other than the color of the primary color light beam.

[0089] In the embodiment of the present application, the primary color light beam is a primary color light beam of a certain color, for example, a red primary color light beam, or a green primary color light beam, or a blue primary color light beam. The embodiment of the present application does not limit the color of the primary color light beam.

[0090] The phase light modulation device 101 is configured to phase modulate the primary color light beam according to the phase video signal, and emit the modulated light to the amplitude light modulation assembly 102.

[0091] The amplitude light modulation assembly 102 is configured to adjust the modulated light according to the display driving signal to obtain a projection light beam, and the projection light beam is used for projection display through the lens 300.

[0092] For example, when the laser projection device displays a projection image, the video processing assembly 103 can receive a video signal, which is a signal corresponding to the projection image. The video processing assembly 103 generates a phase video signal according to the video signal, and sends the phase video signal to the phase light modulation device and sends the video signal to the display driving assembly 104.

[0093] It should be noted that the video processing component 103 sends the phase video signal to the phase light modulation device, and the display driving component 104 sends the video signal, which can be synchronous or asynchronous, such as determining the time of sending the phase video signal and the video signal according to the processing capacity, processing time consumption and the like of the phase light modulation device, the display driving component and the amplitude light modulation component, and finally matching the phase modulation time sequence, the amplitude modulation time sequence and the laser light emission time sequence of the primary color light beam.

[0094] Further, the display driving component 104 can receive the video signal, generate the dimming signal and the display driving signal according to the video signal, and send the dimming signal to the laser driving component 105 and the display driving signal to the amplitude light modulation component 102.

[0095] It should be noted that the display driving component 104 sends the dimming signal to the laser driving component 105 and the display driving signal to the amplitude light modulation component 102, which can be synchronous or asynchronous, and the principle of determining synchronous or asynchronous transmission is similar to the above, which can finally match the phase modulation time sequence, the amplitude modulation time sequence and the laser light emission time sequence of the primary color light beam.

[0096] Since the dimming signal includes the first dimming signal in the first period and the second dimming signal in the second period, the laser driving component 105 can drive the light source component 100 to emit the primary color light beam to the phase light modulation device 101 in the first period according to the first dimming signal, and not to emit the primary color light beam and other colors of the primary color light beam in the second period according to the second dimming signal; other colors are colors other than the color of the primary color light beam. For example, when the primary color light beam is a red primary color light beam, the laser driving component 105 can drive the light source component 100 to emit the red primary color light beam to the phase light modulation device 101 in the first period according to the first dimming signal, and not to emit the red primary color light beam and other colors of the primary color light beam other than red in the second period according to the second dimming signal.

[0097] It should be noted that when the light source component 100 emits the primary color light beam to the phase light modulation device, the phase light modulation device 101 reaches the first target state, which is the state that the phase light modulation device needs to reach when modulating the primary color light beam. Specifically, the first target state is the modulation state of the phase light modulation device 101 described in the following embodiments.

[0098] The phase light modulation device 101 modulates the primary color light beam according to the phase video signal and emits the modulated light to the amplitude light modulation component 102.

[0099] It should be noted that the phase light modulation device 101 can control the micro-mirror to move according to the phase video signal, so that the micro-mirror changes from the initial state to the first target state corresponding to the phase video signal, so that the primary color light beam can be phase-modulated by the micro-mirror in the first target state. The initial state can be the state reached after the last movement of the micro-mirror, or the state when the micro-mirror is not moved.

[0100] The amplitude light modulation assembly 102 adjusts the modulation light according to the display driving signal to obtain the projection light beam, which is used for projection display through the lens 300.

[0101] It should be noted that when the phase light modulation device 101 reaches the first target state, the amplitude light modulation assembly 102 reaches the second target state, which is the state that the amplitude light modulation assembly 102 needs to reach when adjusting the modulation light. Specifically, the amplitude light modulation assembly 102 can control the micro-mirror in the amplitude light modulation assembly 102 to move according to the display driving signal, so that the micro-mirror changes from the initial state to the second target state corresponding to the display driving signal, so that the modulation light beam can be modulated by the micro-mirror in the second target state to obtain the projection light beam. The second target state is the working state (also referred to as the amplitude modulation state, simply referred to as the modulation state) of the amplitude light modulation assembly 102.

[0102] It can be understood that for the primary color light beam, the light source assembly 100 only emits the primary color light beam to the phase light modulation device 101 in the first time period, and the phase light modulation device 101 phase-modulates the primary color light beam in the first time period to obtain the modulation light beam (simply referred to as modulation light). Therefore, the amplitude light modulation assembly 102 adjusts the modulation light in the first time period to obtain the projection light beam.

[0103] In this way, when the laser projection device performs projection display, the light source assembly 100 emits the primary color light beam to the phase light modulation device 101 in the first time period, and in the second time period, the light source assembly 100 does not emit any color of the primary color light beam. So that in the first time period, the light source assembly 100, the phase light modulation device 101 and the amplitude light modulation assembly 102 match each other, which can reduce the poor display effect caused by mismatching, and can effectively improve the display effect of the laser projection device.

[0104] For example, the video signal received by the video processing assembly 103 can be obtained by processing an external video source by the main control chip 106 in the laser projection device. Next, the laser projection device including the main control chip 106 is described. For details, refer to FIG. 7, which is a structural schematic diagram of another laser projection device provided by the embodiment of the application.

[0105] As shown in FIG. 7, the laser projection device can include a main control chip 106, a video processing component 103, a display driving component 104, a phase light modulation device 101, an amplitude light modulation component 102, a lens 300, a power supply, a laser driving component 105, and three-color lasers. The phase light modulation device 101 includes a phase light modulation driving component and a phase light modulator.

[0106] It should be noted that FIG. 7 is only used as an example to illustrate that the light source component 100 includes three-color lasers, and does not constitute any limitation.

[0107] The power supply is configured to supply power to each component in the laser projection device, and can drive the three-color lasers to emit light through the laser driving component 105. The three-color lasers are lasers of red, green, and blue colors.

[0108] The main control chip 106 is configured to generate a video signal according to an external video source (for example, decoding the external video source into a video signal), and send the video signal to the video processing component 103. For example, the external video source can be a network video source, and can also be a video source in a High Definition Multimedia Interface (HDMI) video signal or a storage medium such as a U disk. The decoded video signal can be a V-By-One (VBO) signal developed for image transmission, or a Low Voltage Differential Signaling (LVDS) interface, etc. The main control chip 106 is also configured to decode an audio signal and output the audio signal to a power amplifier.

[0109] In a possible implementation, the main control chip 106 can be a System on Chip (SoC).

[0110] The video processing component 103 is configured to receive the video signal sent by the main control chip 106, process the video signal through a phase recovery algorithm to obtain a phase video signal, synchronize the phase video signal and the video signal, and adjust the delay between the two signals, so as to finally match the phase modulation timing, the amplitude modulation timing, and the laser light emission timing corresponding to the primary color light beams. The video processing component 103 is also configured to send the video signal to the display driving component 104, and send the phase video signal to the phase light modulation driving component.

[0111] In a possible implementation, the video processing component 103 can include a Field Programmable Gate Array (FPGA) chip, or the video processing component 103 can also be a Graphics Processing Unit (GPU), and the video processing component 103 can be configured with a memory, such as a Double Data Rate Synchronous Dynamic Random Access Memory (DDR SDRAM), to cooperate with the FPGA chip or the GPU to implement large-scale image processing operations.

[0112] The display driving component 104 is configured to receive a video signal from the video processing component 103, and send a dimming signal to the laser driving component 105 according to the video signal, so that the laser driving component 105 drives the three-color laser to emit a primary color light beam. The display driving component 104 is also configured to send a display driving signal to the amplitude light modulation component 102 according to the video signal, so as to drive the amplitude light modulation component 102 to perform PWM light modulation to realize a display function.

[0113] In a possible implementation, the display driving component 104 can be a Digital Light Processing (DLP) chip.

[0114] The three-color laser is configured to output a three-color laser light beam that is sequentially lit under the driving of the laser driving component 105. If the light emission sequence is a red light (R)-green light (G)-blue light (B) cycle, the three-color laser emits a three-color laser illumination light beam in the order of R-G-B, and the light beam is incident on the phase light modulation device 101.

[0115] The phase light modulation driving component is configured to receive a phase video signal from the video processing component 103, and drive the phase light modulation device to perform phase modulation on each primary color light beam emitted by the three-color laser. The phase modulation on the phase light speed of each primary color light realizes diffraction imaging of each primary color light, so that the light field intensity brightness at the amplitude light modulation component 102 is locally adjusted.

[0116] The phase light modulation device is configured to perform phase modulation on the light beam incident thereon under the driving of the phase light modulation driving component, and emit a modulated light to the amplitude light modulation component 102.

[0117] The amplitude light modulation component 102 is configured to perform PWM light modulation on the modulated light according to the display driving signal sent by the display driving component 104, and the modulated light beam is displayed and imaged on a projection screen through the lens 300, so as to realize local backlight adjustment.

[0118] In a possible implementation, the amplitude light modulation component 102 can be a Digital Micromirror Device (DMD).

[0119] It should be noted that the video signal obtained by the display driving component 104 can be sent by the video processing component 103 or the main control chip 106. The above description with reference to FIG. 7 is only an example in which the video signal obtained by the display driving component 104 is sent by the video processing component 103, and does not constitute any limitation.

[0120] In the above embodiment, the video signal is usually a multi-channel serial signal, which needs to be decoded to generate a plurality of sub-video signals. For example, the plurality of sub-video signals can include an R sub-video signal, a G sub-video signal, and a B sub-video signal.

[0121] In the embodiment of the present application, the method for obtaining the sub-video signal can include the following two possible implementations:

[0122] In a possible implementation, the main control chip 106 can generate a plurality of sub-video signals according to the video signal, and then input the plurality of sub-video signals to the video processing component 103. In this way, the processing capacity requirement of the video processing component 103 can be reduced, and the processing process can be completed in the main control chip 106.

[0123] In this way, the video processing component 103 can obtain the plurality of sub-video signals sent by the main control chip 106, and the plurality of sub-video signals are obtained by decoding the video signal. For any one sub-video signal, the phase information signal corresponding to the sub-video signal is determined. The phase video signal is determined according to the phase information signals corresponding to the plurality of sub-video signals. It can be understood that the phase information signal includes a plurality of phase map information. That is, the phase information signals corresponding to the plurality of sub-video signals include a plurality of phase map information corresponding to the plurality of sub-video signals one by one, for example, R phase map information corresponding to the R sub-video signal, G phase map information corresponding to the G sub-video signal, and B phase map information corresponding to the B sub-video signal.

[0124] In another possible implementation, the video processing component 103 can generate a plurality of sub-video signals according to the video signal, so that the interface link is simple, but the processing capacity of the video processing component 103 is increased. The video signal is output from the video interface in the main control chip 106, and is input to the video processing component 103. The video processing component 103 decodes the R sub-video signal, the G sub-video signal, and the B sub-video signal to obtain the R sub-video signal, the G sub-video signal, and the B sub-video signal. The sub-video signal can be stored in the memory.

[0125] Since the laser projection device needs the phase information in the spatial light field when controlling the micro-mirror movement of the phase light modulation device 101, the phase information of the spatial light field corresponding to the projection image needs to be included in the above-mentioned phase video signal. However, the phase information cannot be measured, and in the embodiments of the present application, a phase recovery algorithm can be used to determine the phase information in the spatial light field. The principle of the method for determining the phase information in the spatial light field by using the phase recovery algorithm is as follows.

[0126] With the known light field amplitude (intensity) information of the input face (image face, i.e. the light field input to the phase light modulation device 101) and the output face (far-field diffraction plane, i.e. the light field of the amplitude light modulation assembly 102), i.e. the two light field transformation relationships are known, the phase information of the light field can be solved by diffraction calculation iteration (i.e. multiple constraint replacement and transformation in both spatial and spectral domains). Here, taking the Gerchberg-Saxton (hereinafter referred to as GS) algorithm as an example, the input face light wave function f(x, y) of the illumination light beam output by the light source at the phase light modulation device 101 can be represented as: f(x, y) = A(x, y)exp(iΦ(x, y)) (1)

[0127] Wherein, A(x, y) and Φ(x, y) represent the amplitude distribution and phase distribution of the light field at the phase light modulation device 101 respectively, wherein A(x, y) is a known quantity, Φ(x, y) can be estimated initially, and (x, y) represents the input face (image face) point coordinates.

[0128] The amplitude distribution and phase distribution at the output face of the light wave function f(x, y) after phase modulation can be represented by the light wave function g(u, v): g(u, v) = B(u, v)exp(iθ(u, v)) (2)

[0129] Wherein, B(u, v), θ(u, v) and (u, v) represent the amplitude distribution, phase distribution and point coordinates on the output face of the illumination light beam after phase modulation respectively. Among them, since the light intensity information after modulation depends on the video signal, the amplitude distribution B(u, v) is known.

[0130] Based on the light wave functions f and g, the following transformation conditions are satisfied: g = F(f), f = F -1 (g) (3)

[0131] Wherein, F represents the Fourier transform, F -1represents inverse Fourier transform, thus the output light wave function can be obtained from the input light wave function by Fourier transform, and the input light wave function can be obtained from the output light wave function by inverse Fourier transform. It should be understood that f(x, y) and g(u, v) can respectively represent light wave functions in time domain and frequency domain.

[0132] In summary, the GS algorithm procedure is as follows:

[0133] Step 1, estimate the initial input phase information Φ0(x, y), and set the iteration loop operation number K, n is the current loop number. Wherein, the initial input phase information Φ0(x, y) can be a pre-estimated value, or a random value, which is not limited.

[0134] Step 2, Fourier transform the input function f(x, y) = A(x, y)exp(iΦ n (x, y)) to obtain the light wave function g'(u, v), wherein g'(u, v) = B'(u, v)exp(iθ n (u, v)), and obtain the phase relationship θ n (u, v). In the first loop process n = 0, the value of n increases by 1 every loop.

[0135] Step 3, replace the phase information in the output function g(u, v) with θ n (u, v) to obtain g(u, v) = B(u, v)exp(iθ n (u, v)).

[0136] Step 4, inverse Fourier transform g(u, v) = B(u, v)exp(iθ n (u, v)) to obtain f'(x, y) = A'(x, y)exp(iΦ n (x, y)).

[0137] Step 5, determine whether the mean square error between the output amplitude B'(u, v) and B(u, v) is less than a specified index ε, or whether the current loop number reaches a certain iteration loop operation number K, if not, execute step 6, if yes, execute step 7.

[0138] Step 6, replace the phase information in the input function with Φ n (x, y), that is, update f(x, y), and then repeat step 2.

[0139] Step 7, complete the phase recovery operation, Φ K (x, y) is the phase distribution function representing the phase information required by the phase light modulating device 101.

[0140] It should be noted that the embodiments of the present application only take the GS algorithm as an example for illustration, and other phase recovery algorithms can also be used, and the embodiments of the present application do not constitute any limitation.

[0141] In this way, by using the phase recovery algorithm, the phase distribution function of the phase information can be determined, so that the laser projection device can control the phase light modulation device 101 according to the phase distribution function. Wherein, the phase video signal can be determined according to the phase distribution function.

[0142] In combination with the above embodiments, the process of generating the phase video signal by the video processing component 103 according to the video signal is described. Specifically, refer to FIG. 8, which is a structural schematic diagram of a video processing component 103 provided by an embodiment of the present application. As shown in FIG. 8, the video processing component 103 can include a bypass video signal synchronization output module 1031, a sub-frame video decoding module 1032, a phase recovery operation module 1033, and a phase video signal output module 1034.

[0143] In FIG. 8, the main control chip 106 can be used to decode the external video source into a video signal, and the external video source can be a video source of a network, a HDMI video signal or a video source in a storage medium such as a U disk, and the decoded video signal can be a VBO signal, a LVDS signal or the like for internal transmission of the whole machine. The specific form of the video signal is not limited in the embodiments of the present application.

[0144] In the embodiments of the present application, the bypass video signal synchronization output module 1031 is used to divide the video signal into two paths in the video processing component 103, for example, to copy two copies, one of which is used to decode the sub-video signal, and the other of which does not need to be image processed, and directly outputs the video signal to the display driving component 104 for image display by the amplitude light modulation component 102.

[0145] The sub-frame video decoding module 1032 is used to receive the video signal sent by the bypass video signal synchronization output module 1031, obtain the line synchronization signal, the field synchronization signal, the enable synchronization signal and the R, G and B gray value information of all pixel points according to the video signal, form the R sub-video signal according to the R gray value information, form the G sub-video signal according to the G gray value information, and form the B sub-video signal according to the B gray value information. And the R, G and B sub-video signals can be stored in the memory for subsequent phase recovery operation.

[0146] Specifically, the relationship among the video signal, the sub-video signal and the image is as follows: the video signal includes a plurality of images, for any one image in the video signal, the image includes R sub-images, G sub-images and B sub-images, the plurality of R sub-images can form an R sub-video signal, the plurality of G sub-images can form a G sub-video signal, and the plurality of B sub-images can form a B sub-video signal.

[0147] In the embodiment of the present application, the sub-frame video decoding module 1032 can determine whether the resolution of the image needs to be compressed according to the resolution of the phase light modulation device 101. Specifically, the first resolution of the phase light modulation device 101 is obtained, and the pixel compression is performed on the image with a resolution higher than the first resolution in the video signal according to the first resolution, so that the resolution of the image after the pixel compression matches the first resolution.

[0148] In this way, if the number of pixels of the phase light modulation device 101 is less than the number of pixels of the amplitude light modulation assembly 102, that is, the resolution of the phase light modulation device 101 is less than the resolution of the amplitude light modulation assembly 102, the high-resolution image in the video signal needs to be compressed to obtain a low-resolution image, so as to match the number of pixels of the phase light modulation device 101, and then the subsequent phase recovery operation is performed according to the image with the adjusted resolution to obtain the phase video signal, which can also reduce the time of the subsequent phase recovery operation.

[0149] The phase recovery operation module 1033 is configured to read the R sub-video signal, the G sub-video signal and the B sub-video signal from the memory, and perform multiple iteration operations on the R sub-video signal according to the phase recovery algorithm to obtain the phase information of each pixel point in the R sub-video signal and generate R phase map information. The generated phase map information can be cached to the memory for subsequent output. The operation time of the phase recovery operation on the R sub-video signal, the G sub-video signal and the B sub-video signal can be less than the display period of each frame (i.e. the display time length of each frame). The operation time of the phase recovery operation on each R sub-image in the R sub-video signal can be less than the display time length of each sub-image.

[0150] The phase video signal output module 1034 is configured to generate the phase video signal according to the decoded horizontal synchronization signal, the field synchronization signal and the enable synchronization signal, and in combination with the R phase map information, the G phase map information and the B phase map information. It should be understood that the three synchronization signals of the horizontal synchronization signal, the field synchronization signal and the enable synchronization signal can make the generated phase video signal match or align with the row, the light field and the like of the image, so that the phase modulation process aligns with the row, the light field and the enable synchronization signal. Similarly, the three synchronization signals can also make the amplitude modulation process align with the row, the light field and the enable synchronization signal.

[0151] It should be noted that, in order to ensure that the video processing component 103 outputs the video signal and the phase video signal are synchronized, the bypass video signal output module can adjust the time delay of the output video signal, so that the video signal and the phase video signal are output synchronously, and finally the phase modulation time sequence, the amplitude modulation time sequence and the laser light emitting time sequence corresponding to the primary color light beam are matched.

[0152] It can be understood that the phase video signal is composed of continuous phase map information (also known as hologram), and then the phase light modulation driving component can make the phase light modulation device 101 realize phase modulation based on the phase map information of the corresponding primary color light according to the cycle order of the primary color light. Specifically, the phase light modulation driving component can receive the hologram, decode and generate the light modulation driving signal (which can be referred to as driving signal) for controlling the up-down displacement of the micro-mirror on the phase light modulation device 101, realizing the phase modulation of the laser light beam. The modulated light will form diffraction at the amplitude light modulation component 102, thereby realizing HDR display.

[0153] In combination with the above embodiments, the process of generating the light modulation signal and the display driving signal by the display driving component 104 will be described below.

[0154] For example, after the display driving component 104 receives the video signal, it can decode and buffer the video signal. Specifically, the display driving component 104 can generate the display driving signal according to the specific partitioning of the amplitude light modulation component 102 and the BIT range of each primary color pixel point. The time for generating the display driving signal is usually not more than 1 frame of picture display time. Taking R sub-video as an example, the time for generating the display driving signal of each R sub-image in the R sub-video signal is not more than the display time of each frame of sub-image.

[0155] For example, due to the image correction functions such as trapezoidal correction, curtain correction or obstacle avoidance correction of projection in the display driving component 104, additional image correction processing operations need to be added, for example, after buffering 1 frame of image information, the corresponding pixel points need to be moved through the image correction algorithm and the gray information thereof needs to be recalculated to realize the image correction function. Therefore, the time delay of the phase light modulation driving component sending the light modulation driving signal to the phase light modulation device needs to be increased to synchronize the output of the display driving signal by the display driving component 104. For example, the time delay of the phase light modulation driving component sending the light modulation driving signal to the phase light modulation device can be increased according to the time length of the image correction processing operation. Alternatively, the time delay of the video processing component sending the phase video signal to the phase light modulation device 101 can be increased according to the time length of the image correction processing operation. By increasing the time delay, the phase modulation time sequence, the amplitude modulation time sequence and the laser light emitting time sequence corresponding to the primary color light beam are finally matched.

[0156] Next, the matching between the phase light modulation device 101 and the amplitude light modulation assembly 102 is described. For 1 frame of image information in the laser projection device, there can be a mismatch between the phase light modulation device 101 and the amplitude light modulation assembly 102, that is, the phase light modulation device and the amplitude light modulation assembly 102 correspond to one cycle of the light source assembly 100 in the frame, for example, R-G-B cycle of the light source assembly 100.

[0157] Taking 4K 60HZ as an example, the matching relationship between the amplitude light modulation assembly 102 and the phase light modulation device 101 is described. Referring to FIG. 9, FIG. 9 is a display timing corresponding relationship diagram of an amplitude light modulation assembly and a phase light modulation device provided in an embodiment of the present application.

[0158] Because the light-emitting efficiency and thermal conversion rate of different color light beams are different, and the human eye has different sensitivities to different color lasers, the light-emitting proportion of R, G, and B primary colors is required to be different for each frame of image, for example, the proportions of R, G, and B primary color light beams emitted by the light source assembly 100 in one R-G-B cycle are 35%, 45%, and 20% respectively, so as to ensure the display effect. Because the refresh rate of the amplitude light modulation assembly is very high, for example, up to 10,000 Hz, the primary color light display timing (that is, the amplitude modulation timing) of the amplitude light modulation assembly can be designed according to the proportions of R, G, and B primary color light beams emitted by the light source, and completely matches the light-emitting timing of the light source. That is, as shown in FIG. 9, the proportions of R, G, and B primary colors in the primary color light display timing of the amplitude light modulation assembly 102 can also be 35%, 45%, and 20% respectively. The refresh rate of the phase light modulation device 101 is relatively low, and the corresponding primary color light period is at least 694um. Taking an example that each frame of image information is divided into 3 primary colors, each primary color is divided into 8-bit depth, and each frame of image is displayed in 4 sub-frames, the proportion of the primary color light of the phase light modulation device 101 is 4 / (3*8) = 16.7%.

[0159] Therefore, there can be a situation that the phase light modulation device 101 modulates the green primary color light beam, while the amplitude light modulation assembly 102 is still adjusting the modulation light of the red primary color light beam. That is, there is a mismatch between the display timing of the phase light modulation device 101 and the amplitude light modulation assembly 102.

[0160] Because the display timing of the amplitude light modulation assembly is almost unlimited due to its high refresh rate, in the embodiment of the present application, the display timing of the amplitude light modulation assembly 102 can be adjusted according to the proportion of the primary color light of the phase light modulation device 101.

[0161] For example, the time period of the primary color light beam corresponding to the display driving signal generated by the display driving component 104 is N times of a target time period, N is a positive integer. The target time period is the time period of the primary color light beam corresponding to the phase light modulation device 101. Since the display driving signal is used to drive the amplitude light modulation component to perform amplitude modulation, the time period of the primary color light beam corresponding to the amplitude light modulation component is the same as the time period of the primary color light beam corresponding to the display driving signal. Therefore, the time period of the primary color light beam corresponding to the amplitude light modulation component is also N times of the target time period.

[0162] It can be understood that the value of N can be the same or different for different primary color light beams, and the value of N can be set according to the actual situation of the amplitude light modulation component 102 and the phase light modulation device 101, which is not limited in the embodiments of the present application.

[0163] In the first implementation, when the primary color light beam is a red primary color light beam, the target time period can be one time period of the red primary color light beam corresponding to the phase light modulation device 101 shown in FIG. 9, that is, one target time period accounts for 16.7%. When the primary color light beam is a green primary color light beam, the target time period is one time period of the green primary color light beam corresponding to the phase light modulation device 101 shown in FIG. 9, that is, one target time period accounts for 16.7%. Similarly, when the primary color light beam is a blue primary color light beam, the target time period is one time period of the blue primary color light beam corresponding to the phase light modulation device 101 shown in FIG. 9, that is, one target time period also accounts for 16.7%. That is, the time length of the target time period corresponding to any color light beam is equal to the minimum refresh time length (also referred to as the basic refresh time length) of the phase light modulation device. Taking the refresh rate of the phase light modulation device as 1.44KHz as an example, the time length of the target time period = the minimum refresh time length = 694um.

[0164] For example, in FIG. 9, the primary color light accounts for 16.7% in the display timing of the phase light modulation device, which corresponds to one target time period. In order to match the phase light modulation device 101, the R, G, and B primary color accounts for 33.4%, 49.9%, and 16.7% respectively in the display timing of the amplitude light modulation component 102 according to that the target time period accounts for 16.7%. The adjusted R primary color accounts for 2 times of 16.7%, the adjusted G primary color accounts for 3 times of 16.7%, and the adjusted B primary color accounts for 1 times of 16.7%.

[0165] It can be seen that in the first implementation, the value of N can be different.

[0166] In the second implementation, the two time periods of the red light beam in the display timing of the phase light modulation device shown in FIG. 9 are a target time period, the three time periods of the green light beam are a target time period, and the one time period of the blue light beam is a target time period. That is, the length of the target time period of the light beam of any color is equal to the total length of the continuous emission of the light beam of the corresponding color in a frame.

[0167] Taking FIG. 9 as an example, the proportion of the target time period corresponding to the R primary color is 33.4%, the proportion of the target time period corresponding to the G primary color is 49.9%, and the proportion of the target time period corresponding to the B primary color is 16.7%.

[0168] It can be seen that in the second implementation, the value of N is 1.

[0169] For example, the display driving component 104 can generate a display driving signal according to the video signal and the target time period, and send the display driving signal to the amplitude light modulation component 102.

[0170] Since the entire process of the phase light modulation device 101 modulating the primary color light beam includes the processes of loading data, adjusting the micro-mirror (including driving or resetting and driving), and modulating the primary color light beam. That is, the phase light modulation device 101 needs to first load the phase video signal, then control the micro-mirror to move to the corresponding position according to the phase video signal, and finally modulate the primary color light beam emitted by the light source component 100 through the micro-mirror in the corresponding position. That is, the target time period includes the processes of loading data, adjusting the micro-mirror, and modulating the primary color light beam.

[0171] In some prior art, the light source component 100 continuously emits the primary color light beam. Therefore, in the embodiment of the present application, since the phase light modulation device is introduced, if the light source component 100 still continuously emits the primary color light beam, the relationship between the timing of the light source component 100 and the phase light modulation device 101 can be seen from FIG. 10, which is a timing relationship diagram of the light source component 100 and the phase light modulation device 101 provided by the embodiment of the present application.

[0172] As shown in FIG. 10, in an R-G-B cycle period, for each color of the primary color light beam, the phase light modulation device 101 can include R0, P1, and W1 states. Wherein, R0 represents a reset state, P1 represents a running state, and W1 represents a modulation state.

[0173] In the period corresponding to R0, the phase light modulation device 101 loads data and resets the micro-mirror (for the first frame, there can be no reset action), in the period corresponding to P1, according to the loaded data, the micro-mirror is controlled to move to the corresponding position, in the period corresponding to W1, the phase light modulation device 101 modulates the primary color light beams emitted by the light source assembly 100 through the micro-mirror in the corresponding position.

[0174] As can be seen from FIG. 10, if the light source assembly 100 continuously emits primary color light beams, for any color of the primary color light beams, there is a case that the phase light modulation device 101 does not reach the W1 state, and the laser emits the primary color light beams to the phase light modulation device 101, so that the phase light modulation device 101 does not modulate or incorrectly modulates the primary color light beams, which affects the final display effect.

[0175] Based on this, in the embodiment of the present application, the display timing of the light source assembly 100 emitting the primary color light beams can also be adjusted according to the primary color light proportion of the phase light modulation device 101, so that the display timing of the amplitude light modulation assembly and the display timing of the light source assembly 100 emitting the primary color light beams are synchronized, so that the display timings of the light source assembly, the phase light modulation device and the amplitude light modulation assembly are matched.

[0176] For example, the sum of the first period and the second period is N times of the target period. That is, for any primary color light beam in any R-G-B cycle, the light emission period (i.e. the first period) and the non-light emission period (i.e. the second period) of the primary color light beam are integer times of the period of the corresponding primary color light beam of the phase light modulation device.

[0177] In this way, by setting the timing of the light source assembly 100 and the amplitude light modulation assembly 102 for a certain color of the primary color light beam to be N times of the phase light modulation device 101 for the color of the primary color light beam, the light source assembly 100, the phase light modulation device and the amplitude light modulation assembly 102 can be matched in processing different colors of the primary color light, that is, when the light source assembly 100 emits a certain color of the primary color light beam, the phase light modulation device 101 is in a state of modulating the color of the primary color light beam, and the amplitude light modulation assembly 102 is also in a state of modulating the color of the primary color light beam, which can effectively improve the display effect of the laser projection equipment.

[0178] According to the above embodiment, the light source assembly 100 emits the primary color light beam in the first period, and does not emit the primary color light beam in the second period, and the second period is a period for the phase light modulation device to load data and refresh the micro-mirror, so as to avoid incorrect phase modulation of the light beam.

[0179] For example, the target period can be divided into a preparation period and a working period. The preparation period includes a period in which the phase light modulation device 101 loads the phase video signal, and a period in which the phase light modulation device 101 refreshes the micro-mirror. The working period is a period in which the phase light modulation device 101 modulates the primary color light beam. For example, the preparation period includes R0 and P1, and the working period is W1 in FIG. 10. That is, the phase light modulation device 101 can modulate the primary color light beam emitted by the light source assembly 100 in the working period.

[0180] Thus, in the embodiment of the present application, the display driving assembly 104 is specifically configured to generate the dimming signal and the display driving signal according to the video signal, the preparation period and the working period, and send the dimming signal to the laser driving assembly 105 and the display driving signal to the amplitude light modulation assembly 102.

[0181] The laser driving assembly 105 is specifically configured to drive the light source assembly 100 to emit the primary color light beam to the phase light modulation device 101 in the working period according to the first dimming signal, and drive the light source assembly 100 not to emit the primary color light beam and not to emit other color light beams in the preparation period according to the second dimming signal. The other color is a color other than the color of the primary color light beam.

[0182] The phase light modulation device 101 is specifically configured to load the phase video signal and refresh the micro-mirror in the preparation period, and modulate the primary color light beam in the working period according to the phase video signal, and emit the modulated light to the amplitude light modulation assembly 102.

[0183] The amplitude light modulation assembly 102 is configured to adjust the modulated light to obtain the projection light beam in the working period according to the display driving signal.

[0184] For example, the working process of the laser projection device for the primary color light beam can include that the video processing assembly 103 sends the phase video signal to the phase light modulation device 101 and sends the video signal to the display driving assembly.

[0185] The display driving assembly 104 receives the video signal sent by the video processing assembly 103, generates the dimming signal and the display driving signal according to the video signal, the preparation period and the working period, and sends the dimming signal to the laser driving assembly 105 and the display driving signal to the amplitude light modulation assembly 102. The dimming signal includes the first dimming signal in the working period and the second dimming signal in the preparation period.

[0186] After the laser driving assembly 105 receives the first dimming signal and the second dimming signal, the laser driving assembly 105 drives the light source assembly 100 to emit the primary color light beam to the phase light modulation device 101 in the working period according to the first dimming signal, and drives the light source assembly 100 not to emit the primary color light beam and not to emit the primary color light beam of other colors in the preparation period according to the second dimming signal, wherein the other colors are colors other than the color of the primary color light beam.

[0187] The phase light modulation device 101 receives and loads the phase video signal, and drives the micro-mirror in the phase light modulation device 101 to move to a corresponding position according to the phase video signal to achieve the W1 state, that is, the phase light modulation device 101 enters the working period. In the case that the phase light modulation device 101 achieves the W1 state, the light source assembly 100 emits the primary color light beam to the phase light modulation device 101, the phase light modulation device 101 modulates the primary color light beam in the working period, and emits the modulated light to the amplitude light modulation assembly 102.

[0188] The amplitude light modulation assembly 102 adjusts the modulated light according to the display driving signal in the working period to obtain a projection light beam, and the projection light beam is projected to form an image on a projection screen through the lens 300.

[0189] In the embodiment of the present application, the time when the phase light modulation device 101 achieves the modulation state is not later than the time when the light source assembly 100 emits the primary color light beam. For example, the time when the phase light modulation device 101 achieves the modulation state is consistent with the time when the light source assembly 100 emits the primary color light beam. For another example, the time when the phase light modulation device 101 achieves the modulation state is earlier than the time when the light source assembly 100 emits the primary color light beam.

[0190] For example, the relationship between the time sequence of the light source assembly 100, the phase light modulation device 101 and the amplitude light modulation assembly can be seen from FIG. 11, which is a schematic diagram of the time sequence relationship of another light source assembly 100 and phase light modulation device 101 provided by the embodiment of the present application.

[0191] As shown in FIG. 11, in the period when the phase light modulation device 101 is in the W1 state, that is, the working period, the laser emits the primary color light beam of the corresponding color to the phase light modulation device 101, and in the period when the phase light modulation device 101 is in the R0 and P1 states, that is, the preparation period, the laser is turned off and does not emit the primary color light beam of any color.

[0192] In this way, matching of the light source assembly 100, the phase light modulation device 101 and the amplitude light modulation assembly 102 can be realized. When the phase light modulation device 101 is in the preparation period, the light source assembly 100 does not emit any color primary light beam to the phase light modulation device 101, which can reduce the case that the primary light beam emitted by the light source assembly 100 is received when the phase light modulation device 101 does not reach the W1 state. When the light source assembly 100 emits the light beam to the phase light modulation device 101, the phase light modulation device 101 has reached the W1 state, and the amplitude light modulation assembly 102 has also reached its working state, which can further improve the HDR display effect of the laser projection device.

[0193] In combination with the above embodiments, the first period can be a working period of the phase light modulation device 101, and the second period can be a preparation period of the phase light modulation device 101. The relationship between the timing of the light source assembly 100, the phase light modulation device 101 and the amplitude light modulation assembly can be seen from FIG. 12, which is another timing relationship diagram of the light source assembly 100 and the phase light modulation device 101 provided in the embodiments of the present application.

[0194] Based on the timing relationship diagram shown in FIG. 12, FIG. 13 is a light emission timing diagram of the light source assembly 100 provided in the embodiments of the present application.

[0195] It should be noted that R_EN0 in FIG. 13 is the lighting timing of the R primary light beam, G_EN0 is the lighting timing of the G primary light beam, and B_EN0 is the lighting timing of the B primary light beam.

[0196] In the (a) of FIG. 13, the light emission timing of the light source assembly 100 in the prior art is shown. As can be seen from the (a) of FIG. 13, in one light emission period T of the light source assembly 100, the R-G-B light beams are emitted in a cycle, and there is no time when the light source assembly 100 does not emit any color laser beam.

[0197] The (b) of FIG. 13 is the light emission timing of the light source assembly 100 in the embodiments of the present application. As can be seen from the (b) of FIG. 13, in one light emission period T of the light source assembly 100, the R-G-B light beams are emitted in a cycle, but for any color primary light beam, there is a first period T1 for emitting the color primary light beam and a second period T2 for not emitting any color laser beam. The T2 period is the preparation period of the phase light modulation device 101.

[0198] In this way, the light source assembly 100 emits the primary light beam in the working period of the phase light modulation device 101, and does not emit any color primary light beam in the preparation period of the phase light modulation device 101, which improves the matching degree of the light source assembly 100, the phase light modulation device 101 and the amplitude light modulation assembly 102.

[0199] In order to further improve the stability of dimming, in the embodiment of the present application, the second time period includes a preparation time period and a black insertion time period, the starting time of the black insertion time period is the starting time of the working time period, and the black insertion time period is less than the working time period; the first time period is a time period other than the black insertion time period in the working time period. That is, the working time period includes the black insertion time period and the first time period.

[0200] The embodiment of the present application does not limit the specific duration of the black insertion time period. The duration of the black insertion time period can be flexibly set according to actual conditions.

[0201] That is, there is a black insertion time period in the working time period of the phase light modulation device 101 corresponding to each color of the primary light beam, and in the black insertion time period, the light source assembly 100 does not emit light beams of any color.

[0202] After adding the black insertion time period, the relationship between the timing of the light source assembly 100, the phase light modulation device 101 and the amplitude light modulation assembly can be seen from FIG. 14, which is a timing relationship diagram of the light source assembly 100 and the phase light modulation device 101 provided by the embodiment of the present application when the black insertion time period is added.

[0203] In FIG. 14, the time period of the gray part is the black insertion time period.

[0204] After adding the black insertion time period, the display driving assembly 104 is specifically configured to generate a dimming signal according to the video signal, the preparation time period, the working time period and the black insertion time period, and send the dimming signal to the laser driving assembly 105.

[0205] The laser driving assembly 105 is specifically configured to drive the light source assembly 100 to emit the primary light beam to the phase light modulation device 101 in the first time period according to the first dimming signal, and not to emit the primary light beam and other color primary light beams in the preparation time period and the black insertion time period according to the second dimming signal; the other color is a color other than the color of the primary light beam.

[0206] The display driving assembly 104 also generates a display driving signal according to the video signal, the preparation time period, the working time period and the black insertion time period, and sends the display driving signal to the amplitude light modulation assembly 102;

[0207] The amplitude light modulation assembly 102 is specifically configured to adjust the modulated light in the first time period according to the display driving signal to obtain the projection light beam.

[0208] Based on the timing relationship diagram shown in FIG. 14, FIG. 15 is another light emission timing diagram of the light source assembly 100 provided by the embodiment of the present application.

[0209] It should be noted that R_EN0 in FIG. 15 is the lighting timing of the R primary color light beam, G_EN0 is the lighting timing of the G primary color light beam, and B_EN0 is the lighting timing of the B primary color light beam.

[0210] In FIG. 15, (a) is the light-emitting timing of the light source assembly 100 in the prior art. As shown in (a) of FIG. 15, in one light-emitting period T of the light source assembly 100, R-G-B light beams are cyclically emitted, and there is no time when the light source assembly 100 does not emit any color laser beam.

[0211] (b) of FIG. 15 is the light-emitting timing of the light source assembly 100 in the embodiment of the present application. As shown in (b) of FIG. 15, in one light-emitting period T of the light source assembly 100, R-G-B light beams are cyclically emitted, but for any color primary color light beam, there is a first time period T1 for emitting the color primary color light beam, and a second time period T2 and T3 for not emitting any color laser beam, wherein the T2 time period is a preparation time period of the phase light modulation device 101, and the T3 time period is a black insertion time period.

[0212] In this way, in a time period when the phase light modulation device 101 just enters the modulation state, that is, in the black insertion time period, the light source assembly 100 does not emit any color light beam. When the phase light modulation device 101 enters the modulation state for a period of time, the light source assembly 100 emits the primary color light beam, so that the matching degree between the light source assembly 100, the phase light modulation device 101 and the amplitude light modulation assembly is higher, the light beam for projection imaging is modulated by the phase light modulation device 101 and adjusted by the amplitude light modulation assembly 102, and the display effect of the laser projection device can be improved.

[0213] Next, taking a phase video signal of 4K 60HZ as an example, the timing of the light source assembly 100, the phase light modulation device 101 and the amplitude light modulation assembly 102 in the embodiment of the present application is described. FIG. 16 is a timing relationship diagram of the light source assembly 100, the phase light modulation device 101 and the amplitude light modulation assembly 102 provided in the embodiment of the present application.

[0214] As shown in FIG. 16, assuming that the phase video signal is 4K 60HZ, for one frame of image in 4K 60HZ, taking a single-chip laser projection device as an example, 4K picture is divided into 4 subframes of 1080P, and combined with the movement of the device's galvanometer, 4K display effect is realized. Based on this, for any one frame of image in 60 frames of images in 1s, the amplitude light modulation assembly 102 corresponds to 4 subframes, which are subframe 1, subframe 2, subframe 3 and subframe 4. Each frame of image information is divided into R (red), G (green) and B (blue) three primary colors, and each primary color is divided into 8-bit depth, so the refresh rate of the phase modulation display of the phase light modulation device 101 is 1.44K Hz = 60*3*8.

[0215] In FIG. 16, the phase light modulation device 101 is refreshed and loaded in switching for each primary color. In the loading process, all the micro-mirrors need to be reset first. Taking the red primary color light as an example, the phase light modulation device 101 loads data in the reset state. Considering the bandwidth rate and the refreshing mode, the loading period T load of the phase light modulation device 101 for loading data is about 90us.

[0216] After the data loading is completed, the phase light modulation device 101 enters the running state. In the running state, the phase light modulation device 101 refreshes the position state of the micro-mirror according to the loaded data, so that the phase light modulation device 101 reaches the modulation state. The period of the phase light modulation device 101 in the running state, i.e., the period from the reset state to the modulation state of the phase light modulation device 101, is about 50us. Therefore, the preparation period T useless of the phase light modulation device 101 is about 140us.

[0217] Taking the no-insert black period as an example, when the phase light modulation device 101 reaches the modulation state, the light source assembly emits a red primary color light beam to the phase light modulation device 101. The phase light modulation device 101 modulates the red primary color light beam. When the phase modulation is completed, the phase light modulation device 101 enters the reset state from the modulation state according to the loaded data, to prepare for the following modulation of the green primary color light beam.

[0218] It can be understood that the modulation process of the phase light modulation device for the green primary color light beam and the blue primary color light beam is similar to the modulation process of the red primary color light beam. The embodiments of the present application will not be described here.

[0219] That is, the phase light modulation device 101 has a certain time from starting to receive data to reaching the modulation state according to the loaded data. The action time of the micro-mirror of the amplitude light modulation assembly 102 is only 6us due to the characteristics of the amplitude light modulation assembly 102, i.e., the amplitude light modulation assembly 102 can reach the corresponding modulation state in a short time. The amplitude light modulation assembly 102 has a built-in data buffer, and the loading data does not need to wait. The refreshing rate can be as high as 10,000Hz. Therefore, the design of the display timing of the amplitude light modulation assembly 102 is almost unlimited.

[0220] In FIG. 16, T I-basic is the target period of the phase light modulation device 101, T load is the loading period, i.e., the period of the phase light modulation device 101 for loading the phase video signal, T run is the micro-mirror action period, i.e., the period required for the micro-mirror in the phase light modulation device 101 to change from the initial state to the modulation state, T useless is the preparation period, T useless =T load +Trun , T basic is the working period of the phase light modulation device 101. As can be seen from FIG. 16, T basic = T I-basic -T load -T run .

[0221] T R-max is the maximum period of the red primary color light beam, T R is the period during which the red primary color light beam is actually lit, that is, the period during which the laser emits the red primary color light beam to the phase light modulation device 101. T R = T R-max -T load -T run .

[0222] In combination with the above-described embodiments, in FIG. 16, T R-max may be an integer multiple of T I-basic , and the multiple N = 1.

[0223] In this way, the matching among the light source assembly 100, the phase light modulation device 101, and the amplitude light modulation assembly 102 can be achieved, and the display effect is improved.

[0224] The timing of the light source assembly 100, the phase light modulation device 101, and the amplitude light modulation assembly 102 without the added black insertion period is shown in FIG. 16, taking the phase video signal of 4K 60HZ as an example. After the black insertion period is added, the timing of the light source assembly 100, the phase light modulation device 101, and the amplitude light modulation assembly 102 can be seen from FIG. 17, which is a timing relationship diagram of the light source assembly 100, the phase light modulation device 101, and the amplitude light modulation assembly 102 after the black insertion period is added according to an embodiment of the present application.

[0225] In FIG. 17, the gray part t is the black insertion period, T R-max may be an integer multiple of T I-basic , and the multiple N = 1. In order to ensure the stability of dimming, the black insertion period needs to be added in the primary color light beam switching process to increase the margin in the switching process. Therefore, the actual T R = T max-R -T load -T run -t, where t is less than T basic and greater than or equal to 0. The meanings of other parameters in FIG. 17 can be seen from FIG. 16, and will not be described herein again.

[0226] It should be noted that in an implementation, the phase light modulation device 101 can be refreshed once for a beam of primary light of the same color, that is, as shown in FIG. 16 and FIG. 17, the phase light modulation device 101 is refreshed only when the primary light of each color is switched to the primary light of the next color. In this way, the number of movements of the micro-mirror is reduced, the overall stability is improved, and the display effect is improved. In this implementation, N = 1, and the target time period ratios corresponding to R, G, and B can be 33.4%, 49.9%, and 16.7%, respectively.

[0227] In another implementation, the phase light modulation device 101 can be refreshed more than once, for example, at least twice, for a beam of primary light of the same color. Hereinafter, a case in which the phase light modulation device 101 is refreshed at least twice is described.

[0228] Taking the case in which the phase light modulation device 101 is refreshed twice for each beam of primary light as an example, when the black insertion period is not increased, the timing relationship between the light source assembly 100 and the phase light modulation device 101 is as shown in FIG. 18, which is a timing relationship diagram of the light source assembly 100 and the phase light modulation device 101 when the phase light modulation device 101 is refreshed twice according to an embodiment of the present application. The light emission timing of the light source assembly 100 is as shown in FIG. 19, which is a light emission timing diagram of the light source assembly 100 when the phase light modulation device 101 is refreshed twice according to an embodiment of the present application.

[0229] As shown in FIG. 18, when the phase light modulation device 101 is refreshed twice, for a beam of primary light of the same color, the light emission timing of the light source assembly includes two first time periods and two second time periods, and correspondingly, the display timing of the phase light modulation device includes two preparation time periods and two first time periods.

[0230] When the black insertion period is increased, the timing relationship between the light source assembly 100 and the phase light modulation device 101 is as shown in FIG. 20, which is another timing relationship diagram of the light source assembly 100 and the phase light modulation device 101 when the phase light modulation device 101 is refreshed twice according to an embodiment of the present application. The light emission timing of the light source assembly 100 is as shown in FIG. 21, which is another light emission timing diagram of the light source assembly 100 when the phase light modulation device 101 is refreshed twice according to an embodiment of the present application.

[0231] The meanings of the parameters in FIG. 18, FIG. 19, FIG. 20, and FIG. 21 can be referred to the descriptions in the above embodiments, which will not be repeated here.

[0232] As shown in FIG. 20, when the refresh number of the phase light modulation device 101 is 2, for the same color of the primary light beam, there are 2 first time periods, 2 second time periods, that is, 2 preparation time periods and 2 working time periods, and each working time period includes an insertion black time period.

[0233] For example, for the same color of the primary light beam, when the refresh number of the phase light modulation device 101 is M, the phase light modulation device 101 includes M insertion black time periods, M preparation time periods and M first time periods in the target time period, and M is a positive integer greater than or equal to 2.

[0234] The display driving assembly 104 is specifically configured to generate a dimming signal and a display driving signal according to the video signal, the preparation time period, the working time period and the insertion black time period, and send the dimming signal to the laser driving assembly 105 and the display driving signal to the amplitude light modulation assembly 102.

[0235] The laser driving assembly 105 is specifically configured to drive the light source assembly 100 to emit the primary light beam to the phase light modulation device 101 in any first time period according to the dimming signal, and drive the light source assembly 100 to not emit the light beam in any preparation time period and any insertion black time period.

[0236] The phase light modulation device 101 is specifically configured to phase modulate the primary light beam in any first time period according to the phase video signal, and emit the modulated light to the amplitude light modulation assembly 102.

[0237] In this way, for the same color of the primary light beam, when the refresh number of the phase light modulation device is multiple times, the light source assembly 100 does not emit the primary light beam of any color to the phase light modulation device 101 in the gap of each refresh of the phase light modulation device 101. Instead, the light source assembly 100 emits the primary light beam to the phase light modulation device 101 only after the phase light modulation device 101 reaches the modulation state, so that the primary light beam can be better phase modulated, and the matching between the light source assembly 100, the phase light modulation device 101 and the light modulation assembly is achieved, and the display effect of the laser projection equipment is improved.

[0238] For the same color of the primary light beam, when the refresh number of the phase light modulation device 101 is M, the amplitude light modulation assembly 102 is specifically configured to adjust the modulated light in any first time period (or working time period) according to the display driving signal to obtain the projection light beam.

[0239] In this way, the matching between the phase light modulation device 101 and the amplitude light modulation assembly is achieved, and the display effect of the laser projection equipment can be improved.

[0240] It should be noted that the display driving component can also only increase the insertion black period in the light source component 100 light modulation signal, and does not increase the insertion black period in the display driving signal of the amplitude light modulation component 102, so that the amplitude light modulation component 102 modulates the modulation light according to the display driving signal in any working period; or the display driving signal of the amplitude light modulation component 102 can increase the insertion black period, so that the amplitude light modulation component 102 modulates the modulation light according to the display driving signal in any first period, but does not modulate the modulation light in the insertion black period.

[0241] For example, when the display driving signal of the amplitude light modulation component 102 increases the insertion black period, the amplitude light modulation component 102 has the following two possible implementations for the insertion black period:

[0242] In one possible implementation, the amplitude light modulation component 102 is in a non-working state in any preparation period and any insertion black period, that is, in M preparation periods and M insertion black periods.

[0243] Taking the refresh number of the phase light modulation device 101 as 2 times as an example, the amplitude light modulation component 102 is in a non-working state in the first preparation period and the insertion black period, and is also in a non-working state in the second preparation period and the insertion black period.

[0244] In this way, for the same color primary light beam, the amplitude light modulation component 102 adjusts the number of times of the micro-mirror, which is the same as the phase light modulation device 101.

[0245] In another possible implementation, the amplitude light modulation component 102 is in a non-working state in the target insertion black period and the target preparation period. The target insertion black period can be part of the M insertion black periods, and the target preparation period can be part of the M preparation periods. The part of the insertion black period is P insertion black periods, P is a positive integer less than M, the part of the preparation period is Q preparation periods, Q is a positive integer less than M, P and Q can be the same or different, and the P insertion black periods and the Q preparation periods can correspond to the same first period or different first periods, which is not limited.

[0246] For example, the target insertion black period is the insertion black period except the first insertion black period in the M insertion black periods, and the target preparation period is the preparation period except the first preparation period in the M preparation periods. For another example, the target insertion black period is the first insertion black period in the M insertion black periods, and the target preparation period is the first insertion black period in the M preparation periods.

[0247] The non-working state is a state in which all the micro-mirrors of the amplitude light modulation assembly 102 are off, and the working state is a state in which the amplitude light modulation assembly 102 controls the micro-mirrors to be on according to the display driving signal. That is, in the non-working state, the amplitude light modulation assembly 102 cannot adjust the modulation light, and in the working state, the amplitude light modulation assembly 102 can adjust the modulation light.

[0248] Taking the refresh number of the phase light modulation device 101 as 2 times as an example, the amplitude light modulation assembly 102 is in the non-working state in the first preparation period and the black insertion period, and is in the working state in the second preparation period and the black insertion period.

[0249] In this way, for the primary color light beam of the same color, the amplitude light modulation assembly 102 only needs to adjust the micro-mirrors once.

[0250] Next, taking the phase video signal as 4K 60HZ and the refresh number of the phase light modulation device 101 as 2 times for the primary color light beam of the same color as an example, the timing of the light source assembly 100, the phase light modulation device 101 and the amplitude light modulation assembly 102 in the embodiment of the present application is described.

[0251] When the second period does not include the black insertion period, the timing of the light source assembly 100, the phase light modulation device 101 and the amplitude light modulation assembly 102 is shown in FIG. 22, which is a timing relationship diagram of the light source assembly 100, the phase light modulation device 101 and the amplitude light modulation assembly 102 without a black insertion period according to an embodiment of the present application.

[0252] When the second period includes the black insertion period, the timing of the light source assembly 100, the phase light modulation device 101 and the amplitude light modulation assembly 102 is shown in FIG. 23, which is a timing relationship diagram of the light source assembly 100, the phase light modulation device 101 and the amplitude light modulation assembly 102 with a black insertion period according to an embodiment of the present application.

[0253] The meanings of the parameters in FIG. 22 and FIG. 23 can be referred to the description of the above embodiment, which will not be described here.

[0254] FIGS. 18-23 are used to exemplarily introduce the technical solutions of the present application, taking the refresh number of the phase light modulation device 101 for each primary color light beam as 2. It should be understood that the refresh number of the primary color light beams of different colors can be the same, such as 2 as shown in FIGS. 18-21, or different, such as 2 for the red light beam, 3 for the green light beam, and 1 for the blue light beam according to the display timing of the phase light modulation device shown in FIG. 9, so as to be more consistent with the thermal conversion rate of different color lasers and the perception of different color lasers by the human eye, and to improve the display effect. That is, the refresh number of each primary color light beam can be determined according to the proportion of the total light emission time of each primary color light beam in one cycle and the refresh rate of the phase light modulation device. Next, this will be exemplarily introduced in combination with FIGS. 24 and 25.

[0255] Taking the phase video signal as 4K 60HZ for example, the refresh number of the phase light modulation device 101 for the red primary color light beam is 2, the refresh number of the phase light modulation device for the green primary color light beam is 3, and the refresh number of the phase light modulation device for the blue primary color light beam is 1. The timing of the light source assembly 100, the phase light modulation device 101, and the amplitude light modulation assembly 102 in the present application embodiment is described.

[0256] When the second period does not include the black insertion period, the timing of the light source assembly 100, the phase light modulation device 101, and the amplitude light modulation assembly 102 is shown in FIG. 24, which is another timing relationship diagram of the light source assembly 100, the phase light modulation device 101, and the amplitude light modulation assembly 102 without a black insertion period provided by the present application embodiment.

[0257] When the second period includes the black insertion period, the timing of the light source assembly 100, the phase light modulation device 101, and the amplitude light modulation assembly 102 is shown in FIG. 25, which is another timing relationship diagram of the light source assembly 100, the phase light modulation device 101, and the amplitude light modulation assembly 102 with a black insertion period provided by the present application embodiment.

[0258] It can be seen from FIGS. 18-25 that the refresh number of each primary color light beam in one cycle can be greater than 1. Taking the phase video signal as 4K 60HZ for example, the refresh number of the phase light modulation device can be equal to the refresh rate, i.e. the refresh number is 1440.

[0259] It can be seen from FIGS. 16 and 17 that the refresh frequency of each primary color light beam is 1 in one cycle. Taking the phase video signal of 4K 60HZ as an example, the refresh frequency of the phase light modulation device can be less than the refresh rate, for example, the refresh frequency is 1440 / 2 = 720. It should be understood that the refresh frequency is reduced here, and the refresh rate of the phase light modulation device does not change and is still 1444Hz. The refresh rate is a capability or characteristic. Reducing the refresh frequency of the phase light modulation device can improve the light output efficiency of the light source, shorten the black insertion time, improve the stability of dimming, and thus improve the projection effect.

[0260] Based on the laser projection device described in the above embodiments, the embodiment of the present application further provides a laser projection display method. As shown in FIG. 26, FIG. 26 is a flowchart of a laser projection display method provided by the embodiment of the present application. The laser projection display method can be realized by the laser projection device described in the above embodiments. As shown in FIG. 26, the laser projection display method can include:

[0261] S2601, generating a phase video signal according to the received video signal by the video processing component, and sending the phase video signal to the phase light modulation device, and sending the video signal to the display driving component.

[0262] S2602, sending a dimming signal to the laser driving component and a display driving signal to the amplitude light modulation component according to the video signal by the display driving component, the dimming signal including a first dimming signal in a first time period and a second dimming signal in a second time period.

[0263] S2603, driving the light source component to emit a primary color light beam to the phase light modulation device in the first time period according to the first dimming signal by the laser driving component, and driving the light source component not to emit the primary color light beam and not to emit other color primary color light beams in the second time period according to the second dimming signal; the other color is a color other than the color of the primary color light beam.

[0264] S2604, modulating the primary color light beam according to the phase video signal by the phase light modulation device, and emitting the modulated light to the amplitude light modulation component.

[0265] S2605, adjusting the modulated light according to the display driving signal by the amplitude light modulation component to obtain a projection light beam, the projection light beam being used for projection display.

[0266] The laser projection display method provided by the embodiment of the present application has similar implementation principles and technical effects to the laser projection device described in the above embodiments, and will not be described here.

[0267] The embodiment of the present application further provides a computer readable storage medium, which can include: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk and various storage program codes. Specifically, the computer readable storage medium stores program instructions, and the program instructions are used for the method in the above embodiment.

[0268] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data for analysis, stored data, displayed data, etc.) and signals involved in the embodiments of the present application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of related data need to comply with relevant laws, regulations and standards of countries and regions. For example, the video signal involved in the embodiments of the present application is obtained under sufficient authorization.

[0269] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0270] In order to facilitate explanation, the above description has been made in combination with specific embodiments. However, the above exemplary discussion is not intended to exhaust or limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained according to the above teachings. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different modified embodiments suitable for specific use considerations.

Claims

1. A laser projection device, characterized in that, The laser projection device includes a video processing component, a display driving component, a laser driving component, a light source component, a phase light modulation device, and an amplitude light modulation component; The video processing component is configured to generate a phase video signal based on the received video signal, and send the phase video signal to the phase light modulation device and the video signal to the display driving component; The display driving component is configured to send a dimming signal to the laser driving component and a display driving signal to the amplitude light modulation component according to the video signal, wherein the dimming signal includes a first dimming signal in a first time period and a second dimming signal in a second time period; The laser driving component is configured to drive the light source component to emit a primary color beam to the phase light modulation device during the first time period according to the first dimming signal, and to drive the light source component not to emit the primary color beam and not to emit primary color beams of other colors during the second time period according to the second dimming signal; other colors are colors other than the color of the primary color beam. The phase light modulation device is used to perform phase modulation on the primary color beam within the first time period according to the phase video signal, and to emit modulated light to the amplitude light modulation component; The amplitude light modulation component is used to adjust the modulation light within the first time period according to the display driving signal to obtain a projection beam, which is used for projection display.

2. The laser projection device according to claim 1, characterized in that, The display driving component is specifically used to generate the display driving signal according to the video signal and the target time period, and send the display driving signal to the amplitude light modulation component; the target time period is the time period of the primary color beam corresponding to the phase light modulation device, the time period of the primary color beam corresponding to the display driving signal is N times the target time period, and the sum of the first time period and the second time period is N times the target time period, where N is a positive integer.

3. The laser projection device according to claim 2, characterized in that, The target time period includes a preparation time period and a working time period. The working time period is the time period during which the phase light modulation device modulates the primary color beam. The preparation time period includes the time period during which the phase light modulation device loads the phase video signal and the time period during which the phase light modulation device refreshes the micromirrors. The display driving component is specifically used to generate the dimming signal and the display driving signal according to the video signal, the preparation period and the working period, and send the dimming signal to the laser driving component and the display driving signal to the amplitude light modulation component; The laser driving component is specifically configured to drive the light source component to emit a primary color beam to the phase light modulation device during the working period according to the first dimming signal, and to drive the light source component not to emit the primary color beam and not to emit primary color beams of other colors during the preparation period according to the second dimming signal; other colors are colors other than the color of the primary color beam. The phase light modulation device is specifically used to perform phase modulation on the primary color beam during the working period according to the phase video signal, and to emit modulated light to the amplitude light modulation component; The amplitude light modulation component is used to adjust the modulation light during the working period according to the display driving signal to obtain the projection beam.

4. The laser projection device according to claim 3, characterized in that, The first time period is the working period, and the second time period is the preparation period.

5. The laser projection device according to claim 3, characterized in that, The second time period includes the preparation period and the blackout period, wherein the start time of the blackout period is the start time of the working period, and the blackout period is shorter than the working period; The first time period is the time period excluding the blackout period within the working hours; The display driving component is specifically used to generate the dimming signal based on the video signal, the preparation period, the working period, and the blackout period, and to send the dimming signal to the laser driving component; The laser driving component is specifically used to drive the light source component to emit a primary color beam to the phase light modulation device during the first time period according to the first dimming signal, and to drive the light source component not to emit the primary color beam and not to emit primary color beams of other colors during the preparation period and the black insertion period according to the second dimming signal. Other colors are colors other than the colors of the primary color beam.

6. The laser projection device according to claim 5, characterized in that, The display driving component is specifically used to generate the display driving signal based on the video signal, the preparation period, the working period, and the blackout period, and to send the display driving signal to the amplitude light modulation component; The amplitude light modulation component is specifically used to adjust the modulation light within the first time period according to the display driving signal to obtain the projection beam.

7. The laser projection device according to claim 5, characterized in that, For a primary color beam of the same color, when the refresh number of the phase light modulator is M, the phase light modulator includes M black insertion periods, M preparation periods and M first periods in the target time period, where M is a positive integer greater than or equal to 2; The display driving component is specifically used to generate the dimming signal and the display driving signal according to the video signal, the preparation period, the working period and the black insertion period, and send the dimming signal to the laser driving component and the display driving signal to the amplitude light modulation component; The laser driving component is specifically used to drive the light source component to emit a primary color beam to the phase light modulation device in any of the first time periods according to the dimming signal, and to drive the light source component not to emit a beam in any of the preparation time periods and any of the black insertion time periods; The phase light modulation device is specifically used to perform phase modulation on the primary color beam in any of the first time periods according to the phase video signal, and to emit modulated light to the amplitude light modulation component.

8. The laser projection device according to claim 7, characterized in that, The amplitude light modulation component is specifically used to adjust the modulation light according to the display driving signal during any of the first time periods to obtain the projection beam.

9. The laser projection device according to claim 7, characterized in that, The amplitude optical modulation component is in a non-operating state during both the M preparation periods and the M black insertion periods; or, the amplitude optical modulation component is in a non-operating state during both the target black insertion period and the target preparation period, wherein the target black insertion period is a portion of the M black insertion periods and the target preparation period is a portion of the M preparation periods.

10. The laser projection device according to any one of claims 1-9, characterized in that, The refresh rate of the phase light modulation device is different from the refresh rate of the amplitude light modulation component.

11. A laser projection display method, characterized in that, It is applied to laser projection equipment, which includes a video processing component, a display driving component, a laser driving component, a light source component, a phase light modulation device, and an amplitude light modulation component; The video processing component generates a phase video signal based on the received video signal, and sends the phase video signal to the phase light modulation device and the video signal to the display driving component; The display driving component sends a dimming signal to the laser driving component and a display driving signal to the amplitude light modulation component according to the video signal. The dimming signal includes a first dimming signal in a first time period and a second dimming signal in a second time period. The laser driving component drives the light source component to emit a primary color beam to the phase light modulation device during the first time period according to the first dimming signal, and drives the light source component not to emit the primary color beam and not to emit primary color beams of other colors during the second time period according to the second dimming signal; other colors are colors other than the color of the primary color beam. The phase-modulated light device modulates the primary color beam according to the phase video signal during the first time period and emits modulated light to the amplitude-modulated light component. The amplitude light modulation component adjusts the modulated light according to the display driving signal during the first time period to obtain a projection beam, which is used for projection display.

12. The method according to claim 11, characterized in that, The video processing component sends the phase video signal to the phase light modulation device and the video signal to the display driving component synchronously.

13. The method according to claim 11 or 12, characterized in that, The video processing component synchronizes the phase video signal with the video signal by adjusting the delay between the phase video signal and the video signal.

14. The method according to any one of claims 11-13, characterized in that, The display driving component sends the dimming signal to the laser driving component and the display driving signal to the amplitude light modulation component synchronously.

15. The method according to any one of claims 11-14, characterized in that, The video processing component generates a phase video signal based on the received video signal, including: The video processing component generates multiple sub-video signals based on the video signal, determines the phase information signals corresponding to the multiple sub-video signals respectively, and determines the phase video signals corresponding to the multiple sub-video signals respectively based on the phase information signals corresponding to the multiple sub-video signals. The primary color beams corresponding to the multiple sub-video signals are different, and the phase information signals include phase map information.

16. The method according to any one of claims 11-14, characterized in that, The resolution of the phase optical modulation device is smaller than the resolution of the amplitude optical modulation component; the video processing component generates a phase video signal based on the received video signal, including: The video processing component compresses the image in the video signal whose resolution exceeds that of the phase light modulator to obtain a video signal whose resolution matches that of the phase light modulator, and determines the phase video signal based on the video signal after resolution compression.

17. The method according to any one of claims 11-16, characterized in that, The moment when the phase light modulator reaches the modulation state is no later than the moment when the light source component emits the primary color beam, and the moment when the modulation state is reached refers to the moment when the phase light modulator finishes refreshing the micromirror.

18. The method according to any one of claims 11-17, characterized in that, The refresh rate of the phase light modulation device is different from the refresh rate of the amplitude light modulation component.

19. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by the laser projection device, implements the steps of the method according to any one of claims 11-18.

20. A computer program product, characterized in that, The computer program product stores computer instructions, which, when executed by the laser projection device, implement the steps of the method according to any one of claims 11-18.

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