CN111505841B - Laser modulation method, laser scanning device and system - Google Patents
Laser modulation method, laser scanning device and system Download PDFInfo
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- CN111505841B CN111505841B CN201910098091.XA CN201910098091A CN111505841B CN 111505841 B CN111505841 B CN 111505841B CN 201910098091 A CN201910098091 A CN 201910098091A CN 111505841 B CN111505841 B CN 111505841B
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- G—PHYSICS
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- G02F1/011—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour in optical waveguides, not otherwise provided for in this subclass
- G02F1/0115—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour in optical waveguides, not otherwise provided for in this subclass in optical fibres
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/035—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect in an optical waveguide structure
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
- G02F1/125—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves in an optical waveguide structure
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Abstract
The invention discloses a laser modulation method, a laser scanning device and a laser scanning system, which are used for improving the scanning display capacity of the laser scanning device. The method is applied to a laser scanning device, and the laser scanning device comprises N laser modulation modules and an optical fiber scanner connected with the N laser modulation modules, wherein the N laser modulation modules are used for modulating and outputting modulated light corresponding to pixel points in an image to be displayed, and the modulated light is scanned and emitted into the image to be displayed through the optical fiber scanner; the pixel point in the image to be displayed comprises at least R, G, B color channels, and one color channel corresponds to at least one laser modulation module; the method comprises the following steps: in the laser scanning process, according to the brightness corresponding to each color channel in the pixel point to be scanned, determining the modulation mode of a laser modulation module corresponding to each color channel, wherein the modulation mode is internal modulation or external modulation; and controlling the laser modulation module to modulate and output modulated light with intensity corresponding to the brightness according to the determined modulation mode.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a laser modulation method, a laser scanning device, and a system.
Background
Currently, the modulation mode adopted by the laser modulation system is usually internal modulation or external modulation. The internal modulation is completed in the laser, and the modulation mode of changing the light intensity of the output laser according to the requirement is realized by changing the electric and optical signal input of the laser; the external modulation means that the output light intensity of the laser is not changed (constant or quasi-constant), and an optical modulator is introduced into a subsequent light path of the laser, and the modulation mode that the optical signal emitted from the modulator meets the requirement is achieved by controlling the modulator.
In the optical fiber scanning display, under the condition of only adopting an internal modulation mode, for the actual use requirement of high-power and high-frequency modulation, the performance requirement on a Laser (LD) is extremely high, and the realization is difficult under the premise of controllable cost. Correspondingly, under the modulation mode of only adopting external modulation, due to the characteristics of the modulator, the background noise is larger and can not be completely eliminated, the extinction ratio is lower, the modulation output with extremely low energy can not be realized, the display capability on low gray scale is weaker, and the actual viewing experience is affected.
Disclosure of Invention
The invention aims to provide a laser modulation method, a laser scanning device and a laser scanning system, which are used for improving the scanning display capacity of the laser scanning device.
In order to achieve the above object, in a first aspect, the present invention provides a laser modulation method, which is applied to a laser scanning device, where the laser scanning device includes N laser modulation modules and an optical fiber scanner connected to the N laser modulation modules, where the N laser modulation modules are used to modulate and output modulated light corresponding to pixel points in an image to be displayed, and the modulated light is scanned by the optical fiber scanner and exits as the image to be displayed; the pixel point in the image to be displayed comprises at least R, G, B color channels, one color channel corresponds to at least one laser modulation module, one laser modulation module comprises a laser and an external modulator correspondingly connected with the laser, and N is an integer greater than or equal to 3; the method comprises the following steps:
in the laser scanning process, according to the brightness corresponding to each color channel in the pixel point to be scanned, determining the modulation mode of a laser modulation module corresponding to each color channel, wherein the modulation mode is internal modulation or external modulation;
and controlling the laser modulation module to modulate and output modulated light with the intensity corresponding to the brightness according to the determined modulation mode.
Optionally, according to the determined modulation mode, controlling the laser modulation module to modulate and output modulated light with intensity corresponding to the brightness, including:
if the determined modulation mode is internal modulation, controlling a laser in the laser modulation module to modulate and output modulated light with intensity corresponding to the brightness, and controlling the external modulator to be in a light transmission mode, wherein the external modulator directly transmits the modulated light; or (b)
And if the determined modulation mode is external modulation, controlling a laser in the laser modulation module to modulate and output laser with constant intensity under a preset driving signal, and controlling the external modulator to be in a modulation mode, wherein the external modulator modulates the laser with constant intensity and outputs modulated light with intensity corresponding to the brightness of the color channel.
Optionally, determining, according to the brightness corresponding to each color channel in the pixel point to be scanned, a modulation mode of a laser modulation module corresponding to each color channel includes:
judging whether the modulation power of the laser in the laser modulation module corresponding to the color channel is smaller than or equal to preset power, wherein the modulation power is the output power of the laser in the laser modulation module corresponding to the brightness;
if the modulation power is determined to be smaller than or equal to the preset power, determining that the laser modulation module adopts an internal modulation mode;
otherwise, determining the brightness difference between the brightness of the color channel at the pixel point to be scanned and the brightness in the previous pixel point, and determining the modulation mode of the laser modulation module corresponding to the color channel according to the brightness difference.
Optionally, determining, according to the brightness difference, a modulation mode of the laser modulation module corresponding to the color channel includes:
judging whether the brightness difference is larger than or equal to a brightness difference threshold value;
if the brightness difference is larger than or equal to the brightness difference threshold, determining that the laser modulation module adopts an external modulation mode; otherwise, determining that the modulation mode of the laser modulation module is consistent with the modulation mode of the laser modulation module corresponding to the color channel in the previous pixel point.
Optionally, the external modulator is any one of an electro-optic modulator, an acousto-optic modulator, or a thermo-optic modulator.
In a second aspect, an embodiment of the present invention provides a laser scanning apparatus, including N laser modulation modules, an optical fiber scanner, and a controller, where the N laser modulation modules are disposed on an incident optical path of the optical fiber scanner, and one laser modulation module includes a laser and an external modulator correspondingly connected to the laser; the controller is used for determining a modulation mode of a laser modulation module corresponding to a color channel according to the brightness corresponding to the color channel in a pixel point to be scanned of an image to be displayed, controlling the laser modulation module to modulate and output modulated light with intensity corresponding to the brightness to the optical fiber scanner according to the determined modulation mode, and enabling the optical fiber scanner to scan and emit the image to be displayed; wherein the modulation mode is internal modulation or external modulation, and N is an integer greater than or equal to 2.
Optionally, in an internal modulation mode, the laser in the laser modulation module modulates and outputs modulated light with intensity corresponding to the brightness, the external modulator is in a light transmission mode, and the external modulator directly transmits the modulated light;
in an external modulation mode, the laser in the laser modulation module modulates and outputs laser with constant intensity under a preset driving signal, the external modulator is in a modulation mode, and the external modulator modulates the laser with constant intensity and outputs modulated light with intensity corresponding to the brightness.
Optionally, the external modulator is any one of an electro-optic modulator, an acousto-optic modulator, or a thermo-optic modulator.
Optionally, the optical fiber scanner includes at least one optical fiber, and the modulated light output by the N laser modulation modules is input to the optical fiber scanner through the at least one optical fiber; when the optical fiber scanner only comprises one optical fiber, the modulated light output by the N laser modulation modules is coupled and enters the optical fiber.
In a third aspect, embodiments of the present invention provide a laser scanning system comprising a laser scanning apparatus as described in the second aspect.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
in the embodiment of the invention, two modulation modes of internal modulation and external modulation exist in the optical fiber scanning device simultaneously, the modulation mode of the laser modulation module corresponding to each color channel is determined according to the brightness corresponding to each color channel of the pixel point to be scanned in the image to be displayed, so that the laser modulation module outputs modulated light with the intensity corresponding to the brightness, and the modulated light is input into the optical fiber scanner to scan and emit the image to be displayed, therefore, the modulation mode adopted by the corresponding laser modulation module can be correspondingly determined according to the brightness corresponding to each color channel in the pixel point to be scanned, and the modulation modes of the laser modulation modules corresponding to the color channels are mutually independent and do not influence, so that a plurality of modulation modes can exist for the modulation of one pixel point to be scanned, the modulated light corresponding to the pixel point to be scanned is modulated by the mixed modulation mode, the contrast of the pixel point to be scanned in the image is effectively improved, and the scanning display capability of the optical fiber scanning device is improved.
Drawings
For a clearer description of embodiments of the invention or of solutions in the prior art, the drawings that are necessary for the description of the embodiments or of the prior art will be briefly described, it being evident that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained, without inventive faculty, by a person skilled in the art from these drawings:
FIG. 1 is a schematic diagram of a laser scanning apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a laser modulation method according to an embodiment of the present invention;
fig. 3 is a flowchart of a laser modulation method according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a laser scanning device, where the laser scanning device includes N laser modulation modules, an optical fiber scanner and a controller, where the N laser modulation modules are disposed on an incident light path of the optical fiber scanner, and one laser modulation module includes a laser and an external modulator correspondingly connected to the laser; the controller is used for determining the modulation mode of the laser modulation module corresponding to the color channel according to the brightness corresponding to each color channel in the pixel point to be scanned of the image to be displayed; the laser modulation module modulates and outputs modulated light with intensity corresponding to the brightness of the corresponding color channel according to the determined modulation mode; the modulated light is scanned and emitted by an optical fiber scanner to obtain an image to be displayed, wherein a pixel point in the image to be displayed comprises at least R, G, B color channels, and one color channel corresponds to at least one laser modulation module; the modulation mode is internal modulation or external modulation, so that the modulated light corresponding to a plurality of color channels in the pixel to be scanned is modulated by a mixed modulation mode, and N is an integer greater than or equal to 3.
In the embodiment of the invention, one laser modulation module comprises a laser and an external modulator, wherein the lasers in different laser modulation modules generate light with different wave bands, the external modulator in the laser modulation module is arranged on an output light path of the laser, and the external modulator can be any one of an electro-optical modulator, an acousto-optic modulator or a thermo-optic modulator. The N laser modulation modules at least comprise R, G, B single-color lasers (R, G, B, namely a red laser, a green laser and a blue laser respectively), and the different lasers emit light with different wave bands; the laser in one laser modulation module can be any laser in RGB lasers, and the modulated light corresponding to each color channel in the pixel to be scanned can be modulated and output through N laser modulation modules, wherein the modulated light is the laser with the intensity corresponding to the brightness of the monochromatic light represented by the color channel.
In the embodiment of the invention, the N laser modulation modules can be arranged on an incident light path, for example, the N laser modulation modules can be connected with the optical fiber scanner through the optical fiber of the optical fiber scanner, and the generated modulated light can be scanned and emergent to-be-displayed images through the optical fiber scanner. Wherein the fiber scanner may comprise one or more optical fibers; in the case that the optical fiber scanner includes a plurality of optical fibers, the modulated light output by the N laser modulation modules may enter the optical fiber scanner through a plurality of (e.g., N) optical fibers; or if the optical fiber scanner only comprises one optical fiber, the modulated light output by the N laser modulation modules is coupled and then input into the optical fiber of the optical fiber scanner.
In practical applications, each pixel of an image to be displayed (e.g., a color image) may include a plurality of color channels. In the embodiment of the invention, the image to be displayed is mainly taken as an example for describing that each pixel point comprises R, G, B three color channels in an RGB mode. The three RGB color channels can form various colors, namely colors represented by the pixel points, through different brightness (corresponding to gray values) combinations. When an image is scanned and displayed by the laser scanning device, the image information is modulated into laser light mainly through a modulation mode to form modulated light, and then the modulated light is scanned and emitted through the optical fiber scanner to realize image display. In the embodiment of the invention, one color channel can correspond to at least one laser modulation module, namely, monochromatic light of one color channel can adopt one or more lasers as light sources, and when a plurality of lasers are adopted, speckle of pixel points can be reduced.
Generally, for a fixed-size optical fiber scanner, the modulation bandwidth of each pixel is fixed, and the optical power of the pixel varies randomly with the display content (the brightness combination of the color channels), so that the modulation needs to consider both the minimum requirement from low power and low bandwidth and the limit requirement from high power and high bandwidth.
In an actual scanning display scene, the higher the image frame rate is, the better the look and feel is, and the higher the modulation frequency requirement is, but the higher the requirement on the optical system is, the higher the energy output is required, the higher the high-frequency laser modulation (hundreds of MHz) is realized. The prior modulation system mainly adopts an internal modulation or external modulation mode to modulate the pixel points of the whole image, wherein the internal modulation is characterized by the self luminescence of the LD, can meet the modulation of low power and high bandwidth (even GHz modulation) and also can meet the modulation of high power and low frequency (tens of MHz or tens of KHz, and is determined by the power value and the performance of the LD), and has the advantages of simple light path, direct extinction ratio and the like, such as changing the driving current of the LD to control the output light intensity; however, for high-power and high-frequency modulation, the performance requirement on the LD is high, and the realization is difficult on the premise of controllable cost; correspondingly, the modulation frequency of the external modulator is determined by the modulator, the modulation frequency of a laser path of the external modulator is not limited to the laser, and the external modulator can meet the requirement of high bandwidth (hundred MHz level) and adapt to low bandwidth modulation, and can be used under high power and low power. However, due to the characteristics of the modulator, the background noise of the external modulator is large, complete extinction is difficult to achieve, modulation output with extremely low energy (for example, modulated light with a gray value of 0) cannot be achieved, and the display capability on low gray is weak, so that the actual viewing experience is affected. Therefore, in the prior art, only a single modulation mode is adopted to modulate the image, so that the light-dark contrast and gray level resolution capability between different pixel points in the same frame of image are lower, the display effect is poor, and even distortion is caused.
In the embodiment of the invention, through judging the brightness corresponding to the color channel in the pixel point to be scanned, only when the gray scale difference between the pixel point to be scanned and the adjacent (previous) pixel point exceeds the output performance of the LD, namely, the LD cannot realize the gray scale change from the gray scale to the gray scale of the adjacent pixel point to be scanned within the modulation bandwidth time, the external modulation mode is interposed, so that the high-power high/low frequency modulation is carried out, the display with high lumen number and high contrast is realized through the mixed modulation mode, and the display capability of the laser scanning device is effectively improved.
Specifically, the laser scanning device in the embodiment of the invention can determine the modulation mode corresponding to each laser modulation module through the controller, so that the laser modulation module modulates the modulated light corresponding to the brightness of each color channel in the pixel point to be scanned according to the determined modulation mode. The controller may be a control chip or other module with data processing capability, either independently in the laser modulation device or integrated in the laser modulation module, fiber scanner or other functional module.
The controller can detect the brightness corresponding to each color channel of the pixel point in the image to be displayed, namely the display brightness corresponding to the monochromatic light corresponding to each color channel, determine the modulation power corresponding to the laser modulation module corresponding to each color channel, and judge whether the modulation power is smaller than or equal to the preset power; further, determining a modulation mode corresponding to the laser modulation module according to the judgment result; the modulation power is output power of the laser in the laser modulation module corresponding to brightness of the color channel, and the preset power can be maximum power output by the laser (such as LD) in relaxation time.
The controller can determine that the laser modulation module corresponding to the color channel adopts an internal modulation mode under the condition that the modulation power is smaller than or equal to the preset power. Or, if the controller determines that the modulation power is greater than the preset power, further determining a brightness difference between the brightness of the pixel to be scanned and the brightness of the previous pixel of the color channel, and judging whether the brightness difference is greater than or equal to a brightness difference threshold; if the brightness difference is larger than or equal to the brightness difference threshold value, the laser modulation module is determined to adopt an external modulation mode; otherwise, determining that the modulation mode of the laser modulation module is consistent with the modulation mode of the laser modulation module corresponding to the color channel in the previous pixel point.
In an actual display scene, the laser modulation module modulates and outputs modulated light with intensity corresponding to the brightness of the color channel in an internal modulation mode, and the external modulator is closed. Turning off the external modulator, as used herein, refers to controlling the external modulator in a light transmissive mode, i.e., the external modulator directly transmits the modulated light output by the laser to the fiber scanner. Therefore, in the internal modulation scheme, the external modulator can be considered to be in a non-operation mode in which light is transmitted, and at this time, the laser itself can modulate and output modulated light corresponding to the brightness corresponding to the color channel under the control of the driving signal.
Correspondingly, when the laser modulation module adopts an external modulation mode, a laser in the laser modulation module modulates and outputs laser with constant intensity under a preset driving signal, and the external modulator is in a modulation mode, and in the modulation mode, the external modulator modulates the laser with constant intensity output by the laser and outputs modulated light with intensity corresponding to the brightness of a color channel; the preset driving signal may be a driving signal with a larger current/voltage, and the laser with constant intensity may have an intensity greater than that of the background noise of the external modulator.
Therefore, in the embodiment of the invention, when the laser modulation device displays the image to be displayed according to the required brightness (for example, the display brightness selected by the user), the modulation mode adopted by the laser modulation module corresponding to each color channel when modulating the modulated light of the pixel to be scanned can be determined according to the brightness corresponding to the color channel of the pixel to be scanned in the pixel to be scanned. Compared with the prior art, the laser modulation system only adopts a single modulation mode (internal modulation or external modulation) to modulate and display the whole image, and in the embodiment of the invention, the laser modulation module can be controlled to modulate the modulated light with corresponding intensity by adopting a mixed modulation mode according to the brightness corresponding to each color channel in the pixel point to be scanned, so that each pixel point of the image to be displayed has higher contrast and better display effect.
Based on the same inventive concept, as shown in fig. 2, the embodiment of the present invention further provides a laser modulation method, which can be applied to the laser scanning apparatus shown in fig. 1, or an apparatus or system including the laser scanning apparatus. The method comprises the following steps:
s11: in the laser scanning process, the laser scanning device determines the modulation mode of a laser modulation module corresponding to each color channel according to the brightness corresponding to each color channel in the pixel point to be scanned, wherein the modulation mode is internal modulation or external modulation;
s12: and the laser scanning device controls the laser modulation module to modulate and output modulated light with the intensity corresponding to the brightness according to the determined modulation mode.
In the embodiment of the invention, the laser scanning device can determine the modulation mode adopted by the corresponding laser modulation module when modulating the optical signal of the pixel point to be scanned according to the brightness (such as gray value) corresponding to each color channel in the pixel point to be scanned in the process of scanning and displaying the image to be displayed. Therefore, the modulation modes of the laser modulation modules corresponding to different color channels (for example, R, G, B color channels) in one pixel point can be respectively determined, and the modulation modes are not affected, so that the modulated light corresponding to the brightness of each color channel in the pixel point to be scanned is modulated by the mixed modulation mode, and the image to be displayed can be scanned and emergent by scanning the emergent modulated light through the optical fiber scanner. Therefore, the laser scanning device can ensure that the contrast ratio and the gray level resolution capability between different pixel points in the same frame reach extremely high or even infinitely high through a mixed modulation mode, and can obviously improve the image scanning display effect.
In practical applications, when an image is scanned and displayed by a laser scanning device, image information needs to be modulated into laser light by a modulation mode to form modulated light, and then the modulated light is scanned and emitted by an optical fiber scanner to realize image display. In the embodiment of the invention, when the laser modulation device displays the image to be displayed according to the required brightness (for example, the brightness set by a user), the modulation mode adopted by the laser modulation module corresponding to each color channel in the pixel point to be scanned when modulating the modulated light of the pixel point to be scanned can be determined according to the brightness corresponding to each color channel in the pixel point to be scanned. Compared with the prior art, the laser modulation system only adopts a single modulation mode (internal modulation or external modulation) to modulate and display the whole image, and the embodiment of the invention adopts a mixed modulation mode to modulate the modulated light with corresponding intensity according to the brightness of the color channel in different pixel points, so that each pixel point of the image to be displayed has higher contrast and better display effect.
In S11, the laser modulation module may detect the brightness of each color channel in the pixel point to be scanned of the image to be displayed, and determine whether the modulation power of the laser modulation module corresponding to each color channel is less than or equal to the preset power; the modulation power is output power corresponding to the brightness of the laser in the laser modulation module and the color channel; the preset power may be set according to the maximum power output by the laser (such as LD) in the relaxation time, for example, the limit requirement of the laser scanning device on the LD modulation bandwidth is 100MHz, the maximum power reached by the LD in 10ns (100 MHz) time can be stably output is P, and then the preset power may be set to P or a power value slightly smaller than P.
Generally speaking, the higher the power of the same type of laser, the greater the luminous flux, i.e. the sum of the energy emitted by the light source and received by the human eye, the luminous flux being expressed in lumens (lm), hereinafter described mainly by the luminous flux corresponding to the brightness of the color channel when describing the power corresponding to the brightness of the color channel in the pixel to be scanned.
In one possible implementation manner, if in S11, the laser scanning device determines that the modulation power of the laser modulation module corresponding to the color channel is less than or equal to the preset power, that is, the brightness of the monochromatic light corresponding to the color channel in the pixel point to be scanned is lower, the output performance of the laser can meet the modulation, and it can be determined that the laser modulation module adopts the internal modulation mode. Under the internal modulation mode, the laser scanning device controls the laser in the laser modulation module to modulate and output modulated light with the intensity corresponding to the brightness of the color channel, and simultaneously, the external modulator is closed to control the external modulator to be in a light transmission mode, and the external modulator directly transmits the modulated light output by the laser. When the energy corresponding to the brightness of the color channel in the pixel point is lower than the output power of the laser, the internal modulation is adopted to meet the modulation requirement.
In another possible implementation manner, if in S11, the laser scanning device determines that the modulation power of the laser modulation module corresponding to the color channel in the pixel to be scanned is greater than the preset power, which indicates that the brightness of the color channel corresponding to the pixel is higher, then the brightness of the color channel in the previous pixel may be combined for further processing.
Specifically, the laser scanning device may detect a luminance difference between the luminance of the color channel at the pixel point and the luminance in the adjacent previous scanned pixel point; further, the laser scanning device judges whether the brightness difference is larger than or equal to a brightness difference threshold value; if the brightness difference is larger than or equal to the brightness difference threshold value, the laser scanning device determines that the laser modulation module adopts an external modulation mode to modulate the modulated light corresponding to the color channel in the pixel point, otherwise, the laser modulation module determines that the modulation mode of the laser modulation module is consistent with that of the laser modulation module corresponding to the color channel in the previous pixel point. For example, if the power corresponding to the brightness of the color channel is greater than the preset power, if the color channel corresponds to the internal modulation mode in the previous pixel point, and the difference between the brightness of the color channel in the pixel point to be scanned and the brightness in the previous pixel point is greater, exceeding the output performance of the LD, and not suitable for continuing to use the internal modulation, then the external modulation mode intervenes, and the external modulation mode is used for modulating the modulated light of the pixel point to be scanned; if the brightness difference of the color channel between two pixel points is smaller, that is, the gray scale difference is not large, the output performance of the internal modulation is enough to meet the requirement of use, the pixel points to be scanned are modulated by adopting the internal modulation mode, and the modulation mode of the laser modulation module corresponding to the color channel is not required to be switched.
The brightness difference threshold can be set according to the luminescence characteristic of the laser tube itself. If the output power of the laser tube and the relaxation time are linear over the whole operating region, this brightness difference threshold is a fixed value (e.g. corresponding to P above); if the relation is nonlinear, the time required for reaching the target power when the output power is instantaneously increased or decreased by the laser tube per se is measured, and the time corresponding to the modulation frequency is compared with the amount to determine the threshold. For example, a table may be made for the corresponding brightness threshold under each output power, and the brightness threshold may be set in advance by querying according to the table when the modulation scheme is actually matched, or a function curve may be fitted as a basis for calculation when the modulation scheme is matched.
Therefore, in the embodiment of the invention, when the laser scanning device determines the modulation mode corresponding to each color channel of the pixel point to be scanned, the laser scanning device determines that the corresponding laser modulation module adopts internal modulation for the color channel with lower brightness (corresponding energy/power is lower); for a color channel with larger brightness (larger corresponding energy/power), further detecting the brightness corresponding to the color channel in the adjacent previous scanning pixel point, determining the brightness difference (namely gray level difference) between the two pixel points of the color channel, and if the brightness difference is larger, determining that the laser modulation module adopts external modulation; if the brightness difference is smaller, the modulation mode corresponding to the color channel in the previous pixel point is consistent, and the modulation mode of the laser modulation module is not required to be switched. Fig. 3 illustrates a flow chart of a laser modulation method in an embodiment of the invention.
Further, after determining the modulation mode of laser modulation, the laser scanning device can control the laser modulation module to modulate and output modulated light of the color channel in the pixel point to be scanned according to the determined modulation mode in S12, the modulated light enters the optical fiber scanner through the optical fiber to scan and emit an image to be displayed, and the contrast and gray level resolution capability between different pixel points in the same frame of image can reach extremely high or even infinite height, so that the display effect is better.
In an actual display scene, for the gray scale of a pixel point in an image (taking a monochrome example), the following two cases may be mainly included: (1) the gray scale difference of adjacent pixel points is extremely large, such as a boundary with obvious bright-dark contrast in an image; (2) the gray scale difference of several consecutive pixels is very small or even the same, i.e. a large area of color blocks, for example, the color blocks occupy the vast majority of the picture display.
If the limit requirement of image scanning on LD modulation bandwidth is 100MHz, LD can stably output the maximum power reached in 10ns (100 MHz) time as P, and the lowest modulation power without causing significant contrast reduction is P0 by using external modulator. Then, when determining the modulation mode of the color channel in the pixel point to be scanned, the laser scanning device may perform the following process:
(1) If the maximum output power of the laser is P1 less than or equal to P under a certain display brightness set/selected by a user, the modulation mode corresponding to the color channel can be fixed as an internal modulation mode under the brightness mode without switching to external modulation;
(2) If the maximum output power of the laser is P2 more than or equal to P under a certain display brightness set/selected by the user, the laser scanning device can detect the gray level difference between the pixel to be scanned and the adjacent previous pixel point when the display signal is output through the control chip, and further judge whether the gray level difference exceeds the output performance of the LD, i.e. whether the LD can realize the gray level change from the previous pixel point to the gray level of the adjacent next pixel point (i.e. the pixel point to be scanned) within the modulation bandwidth time.
If the gray scale difference exceeds the output performance of the LD, adopting external modulation; in the mode, the LD outputs larger constant power which is slightly larger than the matching of the corresponding gray scales of the LD and the LD, and simultaneously adopts an external modulator to realize the modulation of the pixel point; if the gray scale difference is within the output performance of the LD, the modulation is implemented by internal modulation, and external modulation is not interposed.
In an actual display scene, for a continuous pixel sequence, gray scale difference is small, and internal modulation is enough to meet the use requirement; because the modulation bandwidth of the display picture is dynamically changed, the modulation bandwidth requirement is higher when the modulation bandwidth is closer to the central area, more central areas close to the horizontal direction are interposed in an external modulation mode; for the most extreme display case, for example, adjacent pixels near the center of the screen alternately display with the maximum gray scale and the minimum gray scale, external modulation can be adopted as a main mode, and the optimization of the performance can be realized in cooperation with the change of the current. That is, when the maximum gray level is changed to 0, the external modulation is operated and the current is outputted to the threshold current or less (internal modulation), and when the maximum gray level is changed from 0, the current is raised to a current slightly larger than the corresponding maximum gray level (micro-overcharging) in advance.
In order to enable those skilled in the art to better understand the technical solutions provided by the embodiments of the present invention, the following further describes the laser modulation method provided by the embodiments of the present invention in detail.
If the system needs to output ANSI 2000lm and the modulation frequency is 100MHz, taking a red laser corresponding to an R color channel as an example, it is assumed that red light (R) is about 1800lm and the power is about 13W when a white picture (6000 lm) with highest brightness is output, if the system is composed of 4 optical fiber scanners, red light output is about 450lm and energy is about 3.3W corresponding to each optical fiber scanner, and the relaxation time of LD itself output from 0 to 3.3W is assumed to be 20ns (50 MHz) and the relaxation time of reaching 2W output is 10ns (100 MHz). When the display brightness is selected by a user during actual display, the laser scanning device judges according to an actual display picture (namely the brightness of a color channel in each pixel point), when the energy required to be output by red light in the pixel point is smaller than 2w, the laser modulation module corresponding to the red light is determined to adopt an internal modulation mode, namely, modulated light with the intensity corresponding to the red light brightness (450 lm) is controlled to be output by a monochromatic (R) laser through the modulation of a drive signal (current/voltage) of an LD, meanwhile, the external modulator is controlled to be not operated (namely, the light is completely transmitted), the modulated light can scan the emergent laser through the optical fiber scanner, so that the display output of an image to be displayed is completely realized, and the complete dark background (extremely low bias current) can be realized; when the red light energy required by the pixels to be displayed is more than 2w, the LD selects a large current to output constantly, and the external modulator works at the moment to modulate the energy required by the output, so that the contrast and gray level between different pixels in the same frame of image can be ensured, and the resolution capability can be extremely high or even infinitely high. Compared with the contrast of the traditional display at present, the contrast of the laser scanning device in the embodiment of the invention mainly refers to the contrast between a white field and a dark field, and the contrast of a pixel point in an image scanned and emergent by the laser scanning device is more real.
Therefore, the laser scanning device provided by the embodiment of the invention adopts a mode of combining internal modulation and external modulation, and realizes the mixed modulation to achieve the display with high lumen number and high contrast ratio by connecting the spatial light modulator in series in the light path after a light source (such as an LD, a solid laser and the like), thereby effectively improving the display effect of laser scanning display.
Based on the same inventive concept, the embodiment of the invention also provides a laser scanning system, which comprises the laser scanning device shown in fig. 1, so that the scanning display capability of the laser scanning system is improved. The foregoing embodiments corresponding to fig. 1 to 3 are also applicable to the laser scanning system of this embodiment, and by the foregoing detailed description of the laser scanning device, a person skilled in the art can clearly know the implementation of the laser scanning system in this embodiment, which is not repeated herein for brevity of description.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
in the embodiment of the invention, two modulation modes of internal modulation and external modulation exist in the optical fiber scanning device simultaneously, the modulation mode of the laser modulation module corresponding to each color channel is determined by the brightness corresponding to each color channel of the pixel point to be scanned in the image to be displayed, so that the laser modulation module outputs modulated light with the intensity corresponding to the brightness, and the modulated light is input into the optical fiber scanner to scan and emit out the corresponding pixel point in the image to be displayed, so that the modulation mode adopted by the corresponding laser modulation module is determined according to the brightness corresponding to each color channel in the pixel point to be scanned, and the modulation modes of the laser modulation modules corresponding to the color channels are mutually independent, thereby realizing modulating and emitting out the modulated light corresponding to the pixel point to be scanned by the mixed modulation mode, effectively improving the contrast of the pixel point to be scanned in the image, and further improving the scanning display capacity of the optical fiber scanning device.
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (9)
1. The laser modulation method is applied to a laser scanning device and is characterized in that the laser scanning device comprises N laser modulation modules and an optical fiber scanner connected with the N laser modulation modules, wherein the N laser modulation modules are used for modulating and outputting modulated light corresponding to pixel points in an image to be displayed, and the modulated light is scanned and emitted into the image to be displayed through the optical fiber scanner; the pixel point in the image to be displayed comprises at least R, G, B color channels, one color channel corresponds to at least one laser modulation module, one laser modulation module comprises a laser and an external modulator correspondingly connected with the laser, and N is an integer greater than or equal to 3; the method comprises the following steps:
in the laser scanning process, according to the brightness corresponding to each color channel in the pixel point to be scanned, determining the modulation mode of a laser modulation module corresponding to each color channel, wherein the modulation mode is internal modulation or external modulation;
if the determined modulation mode is internal modulation, controlling a laser in the laser modulation module to modulate and output modulated light with intensity corresponding to the brightness, and controlling the external modulator to be in a light transmission mode, wherein the external modulator directly transmits the modulated light; or (b)
And if the determined modulation mode is external modulation, controlling a laser in the laser modulation module to modulate and output laser with constant intensity under a preset driving signal, and controlling the external modulator to be in a modulation mode, wherein the external modulator modulates the laser with constant intensity and outputs modulated light with intensity corresponding to the brightness of the color channel.
2. The laser modulation method as claimed in claim 1, wherein determining the modulation mode of the laser modulation module corresponding to each color channel according to the brightness corresponding to each color channel in the pixel to be scanned comprises:
judging whether the modulation power of the laser in the laser modulation module corresponding to the color channel is smaller than or equal to preset power, wherein the modulation power is the output power of the laser in the laser modulation module corresponding to the brightness;
if the modulation power is determined to be smaller than or equal to the preset power, determining that the laser modulation module adopts an internal modulation mode;
otherwise, determining the brightness difference between the brightness of the color channel at the pixel point to be scanned and the brightness in the previous pixel point, and determining the modulation mode of the laser modulation module corresponding to the color channel according to the brightness difference.
3. The laser modulation method according to claim 2, wherein determining the modulation mode of the laser modulation module corresponding to the color channel according to the brightness difference comprises:
judging whether the brightness difference is larger than or equal to a brightness difference threshold value;
if the brightness difference is larger than or equal to the brightness difference threshold, determining that the laser modulation module adopts an external modulation mode; otherwise, determining that the modulation mode of the laser modulation module is consistent with the modulation mode of the laser modulation module corresponding to the color channel in the previous pixel point.
4. A laser modulation method according to any one of claims 1 to 3, wherein the external modulator is any one of an electro-optical modulator, an acousto-optic modulator or a thermo-optic modulator.
5. The laser scanning device is characterized by comprising N laser modulation modules, an optical fiber scanner and a controller, wherein the N laser modulation modules are arranged on an incident light path of the optical fiber scanner, and one laser modulation module comprises a laser and an external modulator correspondingly connected with the laser; the controller is used for determining a modulation mode of a laser modulation module corresponding to a color channel according to the brightness corresponding to the color channel in a pixel point to be scanned of an image to be displayed, controlling the laser modulation module to modulate and output modulated light with intensity corresponding to the brightness to the optical fiber scanner according to the determined modulation mode, and enabling the optical fiber scanner to scan and emit the image to be displayed; wherein the modulation mode is internal modulation or external modulation, and N is an integer greater than or equal to 2.
6. The laser scanning device according to claim 5, wherein in an internal modulation mode, a laser in the laser modulation module modulates and outputs modulated light having an intensity corresponding to the brightness, the external modulator is in a light transmission mode, and the external modulator directly transmits the modulated light;
in an external modulation mode, the laser in the laser modulation module modulates and outputs laser with constant intensity under a preset driving signal, the external modulator is in a modulation mode, and the external modulator modulates the laser with constant intensity and outputs modulated light with intensity corresponding to the brightness.
7. The laser scanning device of claim 6, wherein the external modulator is any one of an electro-optic modulator, an acousto-optic modulator, or a thermo-optic modulator.
8. A laser scanning device as claimed in any one of claims 5 to 7 wherein the optical fibre scanner comprises at least one optical fibre, the modulated light output by the N laser modulation modules being input to the optical fibre scanner via the at least one optical fibre; when the optical fiber scanner only comprises one optical fiber, the modulated light output by the N laser modulation modules is coupled and enters the optical fiber.
9. A laser scanning system comprising a laser scanning device as claimed in any one of claims 5 to 8.
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