CN111751982A - Scanning display method and device - Google Patents
Scanning display method and device Download PDFInfo
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- CN111751982A CN111751982A CN201910252150.4A CN201910252150A CN111751982A CN 111751982 A CN111751982 A CN 111751982A CN 201910252150 A CN201910252150 A CN 201910252150A CN 111751982 A CN111751982 A CN 111751982A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/103—Scanning systems having movable or deformable optical fibres, light guides or waveguides as scanning elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
Abstract
The embodiment of the invention provides a scanning display method and a scanning display device, which are used for improving the scanning display capability of the scanning display device. The method comprises the following steps: determining a display mode corresponding to the image to be displayed; determining an output mode corresponding to the scanning display device according to the display mode, and controlling the light source to modulate and emit image light corresponding to the image to be displayed according to an LUT lookup table corresponding to the determined output mode, wherein the output mode comprises a high frame rate output mode and a high resolution output mode; scanning and emitting the image light through an optical fiber scanner to form a display image; in the high-frame-rate output mode, the slow-axis actuating part refreshes the image to be displayed repeatedly twice in the first and second half periods of one period, and in the high-resolution output mode, the slow-axis actuating part completes scanning display of one frame of image together in the first and second half periods of one period.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a scan display method and apparatus.
Background
The main structure of the present optical fiber scanner is composed of a base, an actuator, an optical fiber, and a lens, wherein a part of the optical fiber is fixed on the actuator, and a part of the optical fiber extends out of the actuator to be used as an optical fiber cantilever. When the actuator works, one end of the actuator, which is fixed with the base, is a fixed end, and the other end of the actuator is a free end; the actuator is provided with two independent vibration directions, and the sweeping track of the free end is a composite track of the two independent vibration directions; the optical fiber cantilever is driven to scan, and the tail end of the optical fiber cantilever scans in tracks of a spiral or a propeller, Lissajous, a grid type and the like.
In the grid scanning technique, the actuator includes a first actuator that vibrates in a first direction and a second actuator that vibrates in a second direction, and the first direction is set as a slow axis and the second direction is set as a fast axis. The actuator portion may generally employ a piezoceramic vibrator, a magnetovibrator, a thermoelectric vibrator, or the like. With this particular configuration, the second actuator drive frequency in the slow axis direction determines the number of scan lines in a single scan pattern, and the frame rate at which the exit pattern is scanned. For normal display, the frame rate of the scanning emergent pattern is 60-120 fps, i.e. the driving frequency of the slow axis is approximately in the range of 30-60 Hz.
In the scanning process, if the slow axis track is controlled to be triangular wave, one period of the slow axis can be conveniently realized, and the display of two-frame output is realized. For example, in the raster scan, if a triangular wave with a driving frequency of 30Hz for the slow axis is provided, a screen output of 60fps can be realized. Based on the characteristic of scanning and refreshing in the mode, the effective refreshing rates of the edge and the central area of the picture are different, and the visual perception of edge flicker is generated; meanwhile, for a driving frequency with a fixed frequency, an image frame rate and a resolution (slow axis) are mutually restricted, a high refresh rate means sacrifice of the resolution (slow axis), and a higher slow axis resolution is at the cost of loss of the refresh frame rate, and a better solution is not provided at present.
Disclosure of Invention
An embodiment of the present invention provides a scanning display method and a scanning display device, so as to solve the technical problem of the scanning display effect of the scanning display device in the prior art.
In a first aspect, the present invention provides a scanning display method, where the scanning display device includes a light source and an optical fiber scanner connected to the light source, the light source modulates and emits image light corresponding to an image to be displayed, and the image light is emitted by scanning through the optical fiber scanner to form the image to be displayed; the optical fiber scanner comprises an actuator and an optical fiber fixed on the actuator, the actuator part drives the optical fiber to swing under a preset driving signal, the actuator comprises a slow-axis actuator part and a fast-axis actuator part connected with the slow-axis actuator part, the preset driving signal comprises a signal for controlling the fast-axis actuator part to move according to a sine wave track and a signal for controlling the slow-axis actuator part to drive the fast-axis actuator part to move according to a triangular wave track, and the method comprises the following steps:
determining a display mode corresponding to the image to be displayed;
determining an output mode corresponding to the scanning display device according to the display mode, and controlling the light source to modulate and emit image light corresponding to the image to be displayed according to an LUT lookup table corresponding to the determined output mode, wherein the output mode comprises a high frame rate output mode and a high resolution output mode;
scanning and emitting the image light through an optical fiber scanner to form a display image; in the high frame rate output mode, the slow axis actuating part refreshes the image to be displayed repeatedly twice in the first and second half periods of one period; in the high-resolution output mode, the slow axis actuating parts jointly complete the scanning display of one frame of image in the front half period and the back half period of one period.
If the scanning display device adopts a high frame rate output mode, the method further comprises:
when the scanning display device adopts a high frame rate output mode to output, increasing the corresponding driving frequency of the fast axis actuating part in the preset driving signal from a first driving frequency to a second driving frequency; wherein a difference between the first driving frequency and the second driving frequency is less than or equal to a preset threshold.
Optionally, the adjusting the corresponding driving frequency of the fast axis actuating portion in the preset driving signal from a first driving frequency to a second driving frequency includes:
and switching the driving frequency of the fast axis actuating part between the first driving frequency and the second driving frequency according to a preset frequency.
Optionally, determining a display mode corresponding to the image to be displayed includes:
determining a display mode corresponding to the image to be displayed according to input operation of a user; or the like, or, alternatively,
and determining the display type of the image to be displayed according to the content of the image to be displayed and/or the relevance between adjacent images, and determining a corresponding display mode according to the display type.
In a second aspect, an embodiment of the present invention provides a scanning display device, including a light source, an optical fiber scanner, and a controller, where the light source is disposed on an incident light path of the optical fiber scanner, the optical fiber scanner includes an actuator and an optical fiber fixed on the actuator, the actuator includes a slow-axis actuating portion and a fast-axis actuating portion connected to the slow-axis actuating portion, the actuating portion drives the optical fiber to swing under a preset driving signal, and the preset driving signal includes a signal for controlling the fast-axis actuating portion to move according to a sine wave trajectory and a signal for controlling the slow-axis actuating portion to drive the fast-axis actuating portion to move according to a triangular wave trajectory;
the controller is used for determining an output mode of the scanning display device according to a display mode corresponding to an image to be displayed, and controlling the light source to modulate and emit image light corresponding to the image to be displayed according to a display lookup table corresponding to the determined output mode, wherein the output mode comprises a high-frame-rate output mode and a high-resolution output mode; the light source is used for modulating and emitting the image light of the image to be displayed according to the LUT lookup table corresponding to the output mode determined by the controller, and the image light is scanned and emitted by the optical fiber scanner to form the image to be displayed.
Optionally, if the scanning display device adopts a high frame rate output mode, the controller is further configured to:
when the scanning display device adopts a high frame rate output mode to output, increasing the corresponding driving frequency of the fast axis actuating part in the preset driving signal from a first driving frequency to a second driving frequency; wherein a difference between the first driving frequency and the second driving frequency is less than or equal to a preset threshold.
Optionally, the controller is specifically configured to:
and switching the driving frequency of the fast axis actuating part between the first driving frequency and the second driving frequency according to a preset frequency.
Optionally, the slow shaft actuating portion and the fast shaft actuating portion are fixedly connected or integrally formed.
Optionally, the controller is configured to:
determining a display mode corresponding to the image to be displayed according to input operation of a user; or the like, or, alternatively,
and determining the display type of the image to be displayed according to the content of the image to be displayed and/or the relevance between adjacent images, and determining a corresponding display mode according to the display type.
The specific technical scheme provided in the embodiment of the invention is as follows:
in the embodiment of the invention, a scanning display device determines the corresponding output modes of images in different display scenes according to the display modes corresponding to the images to be displayed, and further controls a light source to modulate and output corresponding image light according to an LUT (look up table) table corresponding to the output modes; and under the high-resolution output mode, the scanning display of one frame of image is completed by the front and the back half periods of the slow axis together, the scanning display of the image under different display scenes is met by adopting different output modes, and the image display capability of the system is improved.
Drawings
FIG. 1 is a schematic structural diagram of a scanning display device according to an embodiment of the present invention;
FIG. 2 is a flowchart of a scanning display method according to an embodiment of the present invention;
fig. 3A-3C are schematic views of scanning traces of a fiber scanner according to an embodiment of the invention.
Detailed Description
First, the term "and" in the embodiment of the present invention is only one kind of association relationship describing an associated object, and indicates that three relationships may exist, for example, a and B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
When the invention is referred to as "first", "second", "third" or "fourth", etc., ordinal terms, it should be understood that they are used for distinguishing only if they are actually used to express the order in context.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a scanning display device, which may include a light source, an optical fiber scanner, and a controller. The controller is used for determining a display mode corresponding to an image to be displayed and further determining an output mode corresponding to the scanning display device according to the display mode; if the display mode is determined to be the near-eye display mode, determining that the output mode of the scanning display device is the high frame rate output mode; otherwise, determining the output mode of the scanning display device as a high-resolution output mode; then, image light corresponding to the image to be displayed can be modulated and emitted according to a Look-Up-Table (LUT) Table corresponding to the determined output mode, the image light is scanned and emitted by an optical fiber scanner, and is projected onto a projection surface through a mirror group (the scanner adopting self-focusing optical fiber output can also omit the mirror group) to form an image to be displayed, wherein the image to be displayed can be an image in a video; meanwhile, the optical fiber scanner comprises an actuator and an optical fiber fixed on the actuator, the actuator comprises a slow-axis actuating part and a fast-axis actuating part, the actuating part drives the optical fiber to swing under a preset driving signal, the preset driving signal comprises a signal for driving the slow-axis actuating part to move according to a triangular wave track and a signal for driving the fast-axis actuating part to move according to a sine wave track, and therefore when the optical fiber scanner scans and emits image light corresponding to a high frame rate output mode, the slow-axis actuating part refreshes the image to be displayed twice in one scanning period; and when the optical fiber scanner scans and emits the image light corresponding to the high-resolution output mode, the slow axis actuating part refreshes the image to be displayed once in one scanning period, so that the scanning projection device can modulate the image light of the output image in different output modes according to different display scenes, and further scans and emits the image light, and the image display capability of the scanning projection device is improved.
In the embodiment of the present invention, the light source in the scanning display device may include at least one group of laser light sources, and the light source may control the laser light sources to modulate and emit modulated light, which may also be referred to as image light or imaging light, corresponding to an output mode of an image to be displayed according to the modulation signal. Wherein, a group of laser light sources can at least comprise R, G, B three monochromatic lasers (R, G, B three monochromatic lasers respectively refer to red laser, green laser and blue laser), and each monochromatic laser can comprise one or more. For example, the laser light source 1 includes three monochromatic lasers R1, G1, and B1, and the laser light source 2 includes three monochromatic lasers R2, G2, and B2, and the laser light sources collectively modulate and output image light corresponding to respective output modes.
In practical applications, the light source may be disposed on an incident light path of the optical fiber scanner, for example, connected to an incident end of an optical fiber in the optical fiber scanner; the part of the optical fiber, which is far away from the light source and exceeds the actuator, forms an optical fiber cantilever, and the actuating part drives the optical fiber to swing under a preset driving signal. The slow shaft actuating part and the fast shaft actuating part in the actuator can be fixedly connected by means of bonding, connecting pieces or the like, or the slow shaft actuating part and the fast shaft actuating part can be integrally formed. The fast axis actuating part of the actuator moves according to a sine wave track under the action of a driving signal and vibrates in a first direction; the slow-axis actuating part realizes a triangular wave motion track under the action of the driving signal and drives the fast-axis actuating part to generate vibration in the second direction, namely, the actuator can simultaneously generate vibration in the first direction and the second direction under the action of the driving signal and drive the optical fiber cantilever to sweep in the synthetic direction of the first direction and the second direction. Preferably, the first direction may be an X-axis direction, and the second direction may be a Y-axis direction.
In actual scanning, a slow-axis actuating part in the optical fiber scanner moves according to a triangular wave track under the action of a driving signal, so that the slow-axis actuating part can realize output display of two frames of images in one scanning period. For example, in the case of the raster scan, when the slow axis actuator moves along the triangular wave trajectory, if the driving frequency of the slow axis is 30Hz, 60FPS screen output can be realized. However, based on the characteristic of the scanning refresh in this way, the effective refresh rate of the image frame edge and the central area are different, and the visual perception of edge flicker is generated. Moreover, for the fiber scanner with fixed driving frequency, the image frame rate and resolution on the slow axis are mutually restricted, the high refresh rate means the sacrifice of resolution (slow axis), and the higher slow axis resolution is at the expense of the loss of refresh frame rate, and there is no method for balancing the resolution and frame rate of the displayed image.
FPS (Frames Per Second, number of transmission Frames Per Second) represents the number of Frames (Frames/Second) of the filler image Per Second, i.e., the number of pictures of the motion picture or video. The greater the Frames Per Second (FPS), the more fluid the displayed motion will be. Typically, the lowest FPS to avoid motion disfluency is 30. In practical applications, the FPS may also be understood as a so-called "refresh rate (in Hz)", for example, a refresh rate of 75Hz means that the screen is scanned only 75 times in one second, i.e. 75 frames/second.
In a video display scenario, the entire picture requires image output. In particular, for large screen projection displays, an excessively high frame rate (60fps) is not required, which is also the standard frame rate of conventional video signals, and the application can adopt a high resolution output mode; for near-eye displays such as VR/AR applications, the human eye is more sensitive to the refresh frame rate of the video, requiring a higher refresh rate (e.g., 120 fps). In the near-eye display, human eyes pay more attention to the area of visual focusing, if the near-eye display is matched with the eye movement tracking technology, the actual image display area can be always kept to be positioned at the central part of the scanning area of the optical fiber scanner, and the edge of the scanning range can not be used for displaying, so that in the application, a high frame rate output mode can be adopted.
In actual scanning, when the output mode of the image to be displayed by the scanning display device is determined, the user may actively specify, for example, the user specifies to adopt the high frame rate output mode (or the high resolution output mode); alternatively, the scanning display device may be determined by the controller detecting the image content of the image to be displayed, or the like. In this embodiment of the present invention, the controller may be a control chip or other module with data processing capability, the controller may be independent in the laser modulation device, or may also be integrated in the light source, the optical fiber scanner, or other functional modules, and the controller may be connected to and communicate with the light source and the optical fiber scanner in a wired or wireless manner, which is not limited in this embodiment of the present invention.
Specifically, the controller may first determine a display scene corresponding to the image to be displayed, and determine a corresponding display mode according to the display scene. In determining the display scene, the controller may analyze the image to be displayed. For example, the controller may analyze an object included in the image and a correlation between adjacent plural images to determine that the image to be displayed is an image in a game video or a regular video; if the image to be displayed is an image in a game video, in order to ensure the fluency, determining that the scanning display device adopts a high frame rate output mode; if the image is an image in a normal video (such as a movie, etc.), it is determined that the scanning display device adopts the high-resolution output mode. Alternatively, the controller may also detect a display scene in which the scanning display device is located, such as a near-eye display scene or a large-screen projection scene, and the scanning display device may adopt the high-frame-rate output mode in the near-eye display scene and may adopt the high-resolution output mode in other display scenes, such as the large-screen projection scene. Alternatively, the controller may also determine according to an input operation of the user, for example, according to an operation such as a button or an option, which is not particularly limited in the embodiment of the present invention.
In the following, the embodiments of the present invention are respectively described, in which when the optical fiber scanner is not changed in driving signal, and the scanning display device is displaying images to be displayed in different display modes, the output modes adopted include, but are not limited to, the following cases:
the first condition is as follows: the image to be displayed corresponds to a near-eye display mode, and the scanning display device adopts a high frame rate output mode.
The light source modulates and outputs image light of an image to be displayed according to the first LUT lookup table, when the image light is scanned and emitted by the optical fiber scanner, the slow-axis actuating part repeatedly refreshes the image to be displayed twice in one scanning period, namely the slow-axis actuating part refreshes the image twice in one period when moving according to the triangular wave track, so that the displayed image has a higher frame rate and is suitable for near-eye display. Wherein the LUT lookup table may be used to determine the color and intensity to be displayed for each pixel in a particular image (e.g., an image to be displayed); the LUT tables corresponding to different output modes of the scanning display device may be preset by a designer, or may be automatically generated according to the image information of the image to be displayed and the output mode.
In the high frame rate output mode, the scanning display device controls the light source to modulate the emergent image light according to the corresponding LUT table through the modulation signal, the fast axis actuator performs scanning from left to right (or from right to left) for a half period in the process of moving according to the sine wave track to complete the scanning display of a whole row of pixel points, and in the output mode, the track of the actuator in the optical fiber scanner and the corresponding pixel grid division are as shown in fig. 3A. As can be seen from fig. 3A, in the two adjacent refreshing processes of a row of pixel points, the light spot trajectories are not overlapped, so that the brightness of the image is more uniform, the transition is soft, and the sharpness of the image is lower.
Case two: and the image to be displayed corresponds to a non-near-eye display mode, for example, a conventional display mode such as a large-screen display mode, and the scanning display device adopts a high-resolution output mode.
And the light source modulates and outputs image light of an image to be displayed according to the second LUT table, and when the image light is scanned and emitted by the optical fiber scanner, the slow axis actuating part refreshes the image to be displayed once in one scanning period. When the slow-axis actuating part moves according to the triangular wave track, the slow-axis actuating part completes scanning display of an image in the first and second half periods in one period together, so that the displayed image has higher resolution and is suitable for a large-screen projection mode.
In the high resolution output mode, a scanning display task of an image is completed by a first half period and a second half period of the slow axis together, and the track and the pixel grid division are as shown in fig. 3B. In the figure, taking the scanning start point with the phase shift of pi/4 as an example, the solid line track can represent the scanning track of the slow axis in the first half period, the dashed line track can represent the scanning track of the slow axis actuator in the next half period, and the tracks in the first half period and the second half period alternately scan the left and right pixels in one row. In the high resolution mode, the fast axis actuating part completes the display task of two adjacent rows of half-row pixel points in a half cycle from left to right (or from right to left); in the process of two adjacent refreshing processes of each row of pixel points, the light spot tracks are completely overlapped, but the picture transition is relatively hard, and the image sharpness is high.
Two output modes are compared, including but not limited to these differences: in terms of display specifications, the ratio of the maximum refresh rates of a high frame rate output mode and a high frame rate output mode is 2:1, and the ratio of the corresponding maximum resolutions in the slow axis direction is 1: 2; the image refreshing mechanisms of the two output modes are different; the high-frame rate mode fast axis completes the display of a whole line in a scanning way in a half period from left to right (or from right to left), and the high-resolution mode fast axis completes the display tasks of two adjacent lines in a half period from left to right (or from right to left); therefore, the high frame rate mode can complete two times of refreshing of the image in one period of the slow axis, and the high resolution mode can complete one time of refreshing in the front half scanning period and the back half scanning period of the slow axis; the visual effect is different; in the high frame rate output mode, the effective refresh rates of the whole image are different, a visual flicker phenomenon exists when the refresh rate is low, and the resolution is low; in the high-resolution output mode, the refreshing intervals of all the pixel points are the same, the flicker phenomenon does not exist, the resolution is higher, but the whole refreshing rate is not high; fourthly, displaying effect difference; in the high refresh rate mode, in the two adjacent refresh processes of each row, light spot tracks are not overlapped, the brightness is more uniform, the transition is soft, and the sharpness is lower; in the high-resolution mode, in the two adjacent refreshing processes of each row, the light spot tracks are completely overlapped, but the picture transition is relatively hard and the sharpness is higher.
Further, in order to realize high-sharpness display of images in the high-frame-rate output mode, the controller may also perform fine adjustment of the driving frequency of the fast-axis actuator, and ensure that there is no large change in the supported display specification. For example, the controller may slightly modulate through algorithmic modulation, and adjust the driving frequency corresponding to the fast axis actuation portion from 100Hz to 110Hz, so that the motion trajectories of the light spots are completely overlapped in two half periods before and after the slow axis actuation portion in the scanning display device, thereby improving the image sharpness and enhancing the image display effect in the high frame rate output mode.
Of course, when the controller is performing fine adjustment, the driving frequency corresponding to the fast axis actuator may be switched between the first driving frequency and the second driving frequency according to a preset frequency, for example, the preset frequency may be ± 10Hz, and the driving frequency corresponding to the fast axis actuator is alternately switched between 100Hz and 110Hz, so that the dynamic video display screen is more uniform and the contrast difference is smaller.
As shown in fig. 2, based on the same inventive concept, an embodiment of the present invention provides a scan display method, which may also be used in the scan display apparatus shown in fig. 1, or in a device or system including the scan display apparatus. The method comprises the following steps:
s11: the scanning display device determines a display mode corresponding to an image to be displayed;
s12: the scanning display device determines an output mode corresponding to the scanning display device according to the display mode, and modulates and emits image light corresponding to the image to be displayed according to an LUT lookup table corresponding to the determined output mode; wherein the output mode comprises a high frame rate output mode and a high resolution output mode;
s13: the scanning display device scans the emergent image light to form a display image; in the high frame rate output mode, the slow axis actuating part refreshes the image to be displayed repeatedly twice in the first and second half periods of one period; in the high-resolution output mode, the slow axis actuating parts jointly complete the scanning display of one frame of image in the front half period and the back half period of one period.
In the embodiment of the invention, the scanning display device determines the corresponding output modes of the image in different display scenes according to the display modes corresponding to the image to be displayed, and further modulates and emits the image light of the image to be displayed according to the LUT (look up table) corresponding to the output modes, and meanwhile, the slow-axis actuating part in the optical fiber scanner realizes the triangular wave motion track under the drive of the control signal.
If the display mode corresponding to the image to be displayed is a near-eye display mode, the scanning display device can determine that the output mode is a high frame rate output mode; otherwise, the scanning display device determines that the output mode is the high resolution output mode. In a high frame rate output mode, the optical fiber scanner can repeatedly refresh the display image twice in the front half period and the back half period in one scanning period of the slow axis; and under the high-resolution output mode, the optical fiber scanner can realize that the first and second half scanning periods of the slow axis jointly complete the scanning display of one frame of image, thereby realizing the adoption of different output modes to meet the scanning display of images under different display scenes and improving the image display capability of the system.
In the actual scanning, the scanning display device may first determine a display scene corresponding to the image to be displayed, and determine a corresponding display mode according to the display scene. In determining the display scene, the scanning display device may analyze the image to be displayed, for example, analyze the relationship between objects included in the image and/or adjacent images to determine that the image to be displayed is an image in a game video or a regular video; if the image to be displayed is an image in a game video, in order to ensure the fluency, a high frame rate output mode can be adopted; if the image is an image in a normal video (such as a movie, etc.), a high resolution output mode can be adopted. Alternatively, the scanning display device may also detect a display scene in which the scanning display device is located, such as a near-eye display scene or a large-screen projection scene, and determine that the scanning display device adopts the high-frame-rate output mode in the near-eye display scene and adopts the high-resolution output mode in other display scenes, such as the large-screen projection scene. Alternatively, the scan display device may also be determined according to an input operation of a user, for example, according to an operation such as a button or an option, which is not particularly limited in this embodiment of the present invention.
In actual scanning, under the condition that a driving signal of an optical fiber scanner is not changed, when a scanning display device adopts a high frame rate output mode, a light source in the scanning display device modulates and outputs image light of an image to be displayed according to a first LUT lookup table, and when the image light is scanned and emitted by the optical fiber scanner, a slow axis actuating part refreshes the image to be displayed twice in one scanning period; or when the scanning display device adopts a high frame rate output mode, the light source is controlled to modulate and output the image light of the image to be displayed according to the second LUT table, and when the image light is scanned and emitted by the optical fiber scanner, the slow axis actuating part refreshes the image to be displayed once in one scanning period.
For example, taking the output of 10Hz corresponding to the triangular wave signal of the slow axis and 100Hz (sine wave) corresponding to the fast axis as an example, the scanning track of the slow axis actuator moves along each row of pixel points in the image to be displayed under the control of the triangular wave track tracking drive. If the scanning display device adopts the high frame rate output mode, in this mode, the slow axis actuator refreshes the image to be displayed twice in one period of the movement according to the triangular wave track, and the track of the actuator in the optical fiber scanner and the corresponding pixel meshing are shown in fig. 3A. In the high frame rate output mode, the scanning display device controls the light source to modulate and emit image light corresponding to an image to be displayed in the output mode through a modulation signal, the fast axis actuating part scans from left to right (or from right to left) in a half period in the process of moving according to a sine wave track to complete scanning and displaying of a whole row of pixel points, and as can be seen from fig. 3A, in the process of two adjacent refreshing processes of a row of pixel points, light spot tracks are not overlapped, so that the brightness of the image is more uniform, the transition is soft, and the image sharpness is lower.
Correspondingly, if the scanning display device adopts the high frame rate output mode, the slow axis actuating part completes the scanning display task of an image together in the first and second half periods, and the trace and pixel grid division are shown in fig. 3B. In the figure, the fast axis actuating part completes the display task of two adjacent rows of half-row pixel points in a half cycle from left to right (or from right to left), and in the process of two adjacent refreshes of each row of pixel points, the light spot tracks are completely overlapped.
Further, in the embodiment of the present invention, in the high frame rate output mode, in order to improve the definition of the image, the driving frequency of the fast axis actuator may be increased within a small range, so that the supported display specification is not changed greatly. The scanning display device can also increase the corresponding driving frequency of the fast axis actuating part in the preset driving signal from the first driving frequency to the second driving frequency in the process of emitting the image light by adopting the high frame rate output mode; and the difference value between the first driving frequency and the second driving frequency is less than or equal to a preset threshold value. Preferably, the driving frequency of the fast axis actuator is switched between the first driving frequency and the second driving frequency according to the preset frequency, that is, the driving frequency is frequently switched, so that the dynamic video display screen is more uniform and the contrast difference is smaller.
For example, the driving frequency of the fast axis actuator can be adjusted from 100Hz to 110Hz by algorithmic modulation. As shown in fig. 3C, in order to properly adjust the driving frequency of the fast axis actuator in the high frame rate output mode, the corresponding trajectory and the mesh division mode are illustrated. The scan range of the actuator in fig. 3C is slightly larger than that of fig. 3A, but has no significant effect on the display size of the image.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
in the embodiment of the invention, a scanning display device determines the corresponding output modes of images in different display scenes according to the display modes corresponding to the images to be displayed, and further controls a light source to modulate and output corresponding image light according to an LUT (look up table) table corresponding to the output modes; and under the high-resolution output mode, the scanning display of one frame of image is completed by the front and the back half periods of the slow axis together, the scanning display of the image under different display scenes is met by adopting different output modes, and the image display capability of the system is improved.
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (9)
1. A scanning display method is applied to a scanning display device and is characterized in that the scanning display device comprises a light source and an optical fiber scanner connected with the light source, the light source modulates and emits image light corresponding to an image to be displayed, and the image light is scanned and emitted by the optical fiber scanner to form the image to be displayed; the optical fiber scanner comprises an actuator and an optical fiber fixed on the actuator, the actuator part drives the optical fiber to swing under a preset driving signal, the actuator comprises a slow-axis actuator part and a fast-axis actuator part connected with the slow-axis actuator part, the preset driving signal comprises a signal for controlling the fast-axis actuator part to move according to a sine wave track and a signal for controlling the slow-axis actuator part to drive the fast-axis actuator part to move according to a triangular wave track, and the method comprises the following steps:
determining a display mode corresponding to the image to be displayed;
determining an output mode corresponding to the scanning display device according to the display mode, and controlling the light source to modulate and emit image light corresponding to the image to be displayed according to a display lookup table corresponding to the determined output mode, wherein the output mode comprises a high frame rate output mode and a high resolution output mode;
scanning and emitting the image light through an optical fiber scanner to form a display image; in the high frame rate output mode, the slow axis actuating part refreshes the image to be displayed repeatedly twice in the first and second half periods of one period; in the high-resolution output mode, the slow axis actuating parts jointly complete the scanning display of one frame of image in the front half period and the back half period of one period.
2. The scanning display method of claim 1, wherein if the scanning display device adopts a high frame rate output mode, the method further comprises:
when the scanning display device adopts a high frame rate output mode to output, increasing the corresponding driving frequency of the fast axis actuating part in the preset driving signal from a first driving frequency to a second driving frequency; wherein a difference between the first driving frequency and the second driving frequency is less than or equal to a preset threshold.
3. The method as claimed in claim 2, wherein the adjusting the driving frequency of the fast axis actuator from the first driving frequency to the second driving frequency in the preset driving signal comprises:
and switching the driving frequency of the fast axis actuating part between the first driving frequency and the second driving frequency according to a preset frequency.
4. The scanning display method of any one of claims 1-3, wherein determining the display mode corresponding to the image to be displayed comprises:
determining a display mode corresponding to the image to be displayed according to input operation of a user; or the like, or, alternatively,
and determining the display type of the image to be displayed according to the content of the image to be displayed and/or the relevance between adjacent images, and determining a corresponding display mode according to the display type.
5. A scanning display device is characterized by comprising a light source, an optical fiber scanner and a controller, wherein the light source is arranged on an incident light path of the optical fiber scanner, the optical fiber scanner comprises an actuator and an optical fiber fixed on the actuator, the actuator comprises a slow-axis actuating part and a fast-axis actuating part connected with the slow-axis actuating part, the actuating part drives the optical fiber to swing under a preset driving signal, and the preset driving signal comprises a signal for controlling the fast-axis actuating part to move according to a sine wave track and a signal for controlling the slow-axis actuating part to drive the fast-axis actuating part to move according to a triangular wave track;
the controller is used for determining an output mode of the scanning display device according to a display mode corresponding to an image to be displayed, and controlling the light source to modulate and emit image light corresponding to the image to be displayed according to a display lookup table corresponding to the determined output mode, wherein the output mode comprises a high-frame-rate output mode and a high-resolution output mode; the light source is used for modulating and emitting the image light of the image to be displayed according to the display lookup table corresponding to the output mode determined by the controller, and the image light is scanned and emitted by the optical fiber scanner to form the image to be displayed.
6. The scanning display device of claim 5 wherein if the scanning display device is in the high frame rate output mode, the controller is further configured to:
when the scanning display device adopts a high frame rate output mode to output, increasing the corresponding driving frequency of the fast axis actuating part in the preset driving signal from a first driving frequency to a second driving frequency; wherein a difference between the first driving frequency and the second driving frequency is less than or equal to a preset threshold.
7. The scanning display device of claim 6 wherein the controller is specifically configured to:
and switching the driving frequency of the fast axis actuating part between the first driving frequency and the second driving frequency according to a preset frequency.
8. A scanning display device as claimed in claim 7 wherein the slow axis actuator and the fast axis actuator are fixedly connected or integrally formed.
9. A scanning display device as claimed in any one of claims 5 to 8 wherein the controller is operable to:
determining a display mode corresponding to the image to be displayed according to input operation of a user; or the like, or, alternatively,
and determining the display type of the image to be displayed according to the content of the image to be displayed and/or the relevance between adjacent images, and determining a corresponding display mode according to the display type.
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