CN109600592B - Line synchronization signal generation method, projection module, projector, and storage medium - Google Patents
Line synchronization signal generation method, projection module, projector, and storage medium Download PDFInfo
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- CN109600592B CN109600592B CN201811558986.9A CN201811558986A CN109600592B CN 109600592 B CN109600592 B CN 109600592B CN 201811558986 A CN201811558986 A CN 201811558986A CN 109600592 B CN109600592 B CN 109600592B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
Abstract
The invention discloses a method for generating a line synchronization signal, which comprises the following steps: filtering and amplifying the received sinusoidal signal, and converting the sinusoidal signal into a first pulse signal; generating a second pulse signal according to the pulse width and the pulse center point of the high level of the first pulse signal; performing time delay processing on the second pulse signal for a preset time to enable the rising edge of the second pulse signal to correspond to the peak value of the sinusoidal signal; and acquiring the period of the line lighting pixels, and generating a line synchronization signal according to the rising edge of the second pulse signal after delay processing and the period of the line lighting pixels. The invention also discloses a laser projection assembly, a laser projector and a computer readable storage medium. The invention effectively solves the problem that the received sinusoidal signals influence the in-line synchronous signals due to frequency change or amplitude change.
Description
Technical Field
The present invention relates to the field of data signal communication, and in particular, to a method for generating a line synchronization signal, a laser projection module, a laser projector, and a computer-readable storage medium.
Background
With the development of projection technology, a laser beam scanning projector (LBS) is increasingly popular in the market due to its advantages of simple structure, small size, small optical path loss, low power consumption, wide color range, large contrast, high resolution, no need of focusing, etc.
In the existing laser projection technology, three primary color laser beams need to be projected onto a light curtain for imaging through a reflector of a Micro Electro Mechanical System (MEMS), wherein a sinusoidal signal obtained by driving the reflector with a horizontal driving signal is used as a line synchronization signal of a laser, generally, since a sinusoidal signal adopted by the line synchronization signal of the laser has a frequency consistent with a resonance frequency of an MEMS body, the line synchronization signal is easily affected by a phase shift of a signal processing circuit and a MEMS resonance state, especially the resonance state of the MEMS is most affected, and in the same laser projection system, the resonance frequency of each MEMS may not be consistent, and a resonance frequency point of the MEMS working for a long time may move, which may cause a change of the MEMS resonance state, thereby affecting the movement position of the MEMS and the line synchronization of lighting of the laser.
Disclosure of Invention
The invention mainly aims to provide a line synchronization signal generation method, a laser projection assembly, a laser projector and a computer readable storage medium, which effectively solve the problem that a received sinusoidal signal influences the line synchronization signal due to frequency change or amplitude change.
In order to achieve the above object, the present invention provides a method for generating a horizontal synchronization signal, including:
filtering and amplifying the received sinusoidal signal, and converting the sinusoidal signal into a first pulse signal;
generating a second pulse signal according to the pulse width and the pulse center point of the high level of the first pulse signal;
performing time delay processing on the second pulse signal for a preset time to enable the rising edge of the second pulse signal to correspond to the peak value of the sinusoidal signal;
and acquiring the period of the line lighting pixels, and generating a line synchronization signal according to the rising edge of the second pulse signal after delay processing and the period of the line lighting pixels.
Preferably, the step of filtering and amplifying the received sinusoidal signal and converting the received sinusoidal signal into the first pulse signal includes:
filtering and amplifying the received sinusoidal signal to increase the amplitude of the sinusoidal signal;
and acquiring a reference voltage, and performing analog-to-digital conversion on the filtered and amplified sinusoidal signal according to the reference voltage to generate the first pulse signal with the peak value equal to the reference voltage.
Preferably, the step of generating a second pulse signal according to a pulse width and a pulse center point of a high level of the first pulse signal includes:
acquiring the pulse width and the pulse center point of each high level of the first pulse signal;
calculating to obtain a half pulse width mean value according to the pulse width of each high level;
and generating the second pulse signal with the rising edge coinciding with the central point of the high-level pulse and the high-level pulse width equal to the average value of the half pulse widths.
Preferably, the step of calculating a half-pulse-width average value according to the pulse width of each high level includes:
summing the pulse widths of the high levels, and calculating an average value according to the summation result to obtain a pulse width average value;
and taking the half value of the pulse width mean value as the half pulse width mean value through a filtering algorithm.
Preferably, the method for generating the line synchronization signal is applied to a laser projection assembly, the laser projection assembly includes a laser and a mirror, and before the step of filtering, amplifying and converting the received sinusoidal signal into the first pulse signal, the method further includes:
taking a horizontal position signal of the reflector obtained after the reflector is horizontally adjusted as the sinusoidal signal;
after the step of generating the line synchronizing signal according to the rising edge of the second pulse signal after the delay processing and the period of lighting the pixels in the line, the method further includes:
and acquiring a pre-stored frame synchronization signal and an image data signal, and controlling the laser to emit a laser beam corresponding to the image data signal to the reflector according to the frame synchronization signal and the line synchronization signal so as to reflect, project and image.
Preferably, before the step of using the horizontal position signal of the mirror obtained by horizontally adjusting the mirror as the sinusoidal signal, the method further includes:
when the image data signal is received, generating a reflection driving signal according to the image data signal, and generating a frame synchronization signal corresponding to the reflection driving signal;
and adjusting the position of the reflector by using the reflection driving signal, and obtaining a position signal of the reflector, wherein the position signal comprises a horizontal position signal and a vertical position signal.
Preferably, after the step of adjusting the position of the mirror by using the reflection driving signal and obtaining the position signal of the mirror, the method further includes:
and carrying out time delay correction processing on the frame synchronization signal so as to enable the frame synchronization signal to correspond to the position signal, and taking the frame synchronization signal as the pre-stored frame synchronization signal.
In order to achieve the above object, the present invention further provides a laser projection assembly, where the laser projection assembly includes a laser, an MEMS, a filter amplifier, and a voltage comparator, where the MEMS has a mirror, the mirror is connected to the filter amplifier, the filter amplifier is connected to the voltage comparator, the voltage comparator is connected to the laser, the filter amplifier is configured to filter and amplify a received sinusoidal signal, the voltage comparator is configured to perform analog-to-digital conversion on the filtered and amplified sinusoidal signal to obtain a pulse signal, and the laser projection assembly includes:
the laser projection assembly comprises a memory, a processor and a line synchronization signal generation program which is stored on the memory and can run on the processor, wherein the line synchronization signal generation program realizes the steps of the line synchronization signal generation method when being executed by the processor.
To achieve the above object, the present invention also provides a laser projector including the laser projection assembly as described above, the laser projector including:
the laser projector comprises a memory, a processor and a line synchronization signal generation program stored on the memory and operable on the processor, wherein the line synchronization signal generation program, when executed by the processor, implements the steps of the line synchronization signal generation method as described above.
To achieve the above object, the present invention further provides a computer-readable storage medium having a program for generating a line synchronization signal stored thereon, the program for generating a line synchronization signal implementing the steps of the method for generating a line synchronization signal as described above when executed by a processor.
The line synchronization signal generation method, the laser projection assembly, the laser projector and the computer readable storage medium provided by the invention are used for filtering and amplifying the received sinusoidal signal and converting the sinusoidal signal into a first pulse signal; generating a second pulse signal according to the pulse width and the pulse center point of the high level of the first pulse signal; performing time delay processing on the second pulse signal for a preset time to enable the rising edge of the second pulse signal to correspond to the peak value of the sinusoidal signal; and acquiring the period of the line lighting pixels, and generating a line synchronization signal according to the rising edge of the second pulse signal after delay processing and the period of the line lighting pixels. Therefore, the sinusoidal signal output and fed back by the MEMS is subjected to filtering amplification and analog-to-digital conversion and then is used as the horizontal line synchronization signal for controlling laser lighting, so that the influence of phase shift caused by the resonance state of the driving circuit and the MEMS is avoided, the problem that the received sinusoidal signal influences the line synchronization signal due to frequency change or amplitude change is effectively solved, the real-time, accurate and stable line synchronization signal is obtained, and normal synchronous work of each projection module is ensured.
Drawings
Fig. 1 is a schematic diagram of a hardware operating environment of a terminal according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for generating horizontal synchronization signals according to a first embodiment of the present invention;
FIG. 3 is a flowchart illustrating a method for generating horizontal synchronization signals according to a second embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method for generating horizontal synchronization signals according to a third embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method for generating horizontal synchronization signals according to a fourth embodiment of the present invention;
FIG. 6 is a flowchart illustrating a fifth embodiment of a method for generating line synchronization signals according to the present invention;
FIG. 7 is a diagram illustrating an embodiment of a method for generating horizontal synchronization signals according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a method for generating a line synchronization signal, which is characterized in that a sinusoidal signal output and fed back by an MEMS (micro electro mechanical system) is subjected to filtering amplification and analog-to-digital conversion to be used as a horizontal line synchronization signal for controlling laser lighting, so that the influence of phase shift caused by a resonance state of a driving circuit and an MEMS is avoided, the problem that the received sinusoidal signal influences the line synchronization signal due to frequency change or amplitude change is effectively solved, a real-time, accurate and stable line synchronization signal is obtained, and each projection module can normally and synchronously work.
As shown in fig. 1, fig. 1 is a schematic diagram of a hardware operating environment of a terminal according to an embodiment of the present invention;
the terminal of the embodiment of the invention can be a laser projection assembly and also can be a laser projector.
As shown in fig. 1, the terminal may include: a processor 1001, such as a CPU, a memory 1002, and a communication bus 1003. The communication bus 1003 is used for implementing connection communication between the components in the terminal. The memory 1002 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). The memory 1002 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration of the terminal shown in fig. 1 is not intended to be limiting of the terminal of embodiments of the present invention and may include more or less components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1002, which is a kind of computer storage medium, may include therein a generation program of a line synchronization signal.
In the terminal shown in fig. 1, the processor 1001 may be configured to call a generation program of a line synchronization signal stored in the memory 1002, and perform the following operations:
filtering and amplifying the received sinusoidal signal, and converting the sinusoidal signal into a first pulse signal;
generating a second pulse signal according to the pulse width and the pulse center point of the high level of the first pulse signal;
performing time delay processing on the second pulse signal for a preset time to enable the rising edge of the second pulse signal to correspond to the peak value of the sinusoidal signal;
and acquiring the period of the line lighting pixels, and generating a line synchronization signal according to the rising edge of the second pulse signal after delay processing and the period of the line lighting pixels.
Further, the processor 1001 may call the generation program of the line synchronization signal stored in the memory 1002, and also perform the following operations:
filtering and amplifying the received sinusoidal signal to increase the amplitude of the sinusoidal signal;
and acquiring a reference voltage, and performing analog-to-digital conversion on the filtered and amplified sinusoidal signal according to the reference voltage to generate the first pulse signal with the peak value equal to the reference voltage.
Further, the processor 1001 may call the generation program of the line synchronization signal stored in the memory 1002, and also perform the following operations:
acquiring the pulse width and the pulse center point of each high level of the first pulse signal;
calculating to obtain a half pulse width mean value according to the pulse width of each high level;
and generating the second pulse signal with the rising edge coinciding with the central point of the high-level pulse and the high-level pulse width equal to the average value of the half pulse widths.
Further, the processor 1001 may call the generation program of the line synchronization signal stored in the memory 1002, and also perform the following operations:
summing the pulse widths of the high levels, and calculating an average value according to the summation result to obtain a pulse width average value;
and taking the half value of the pulse width mean value as the half pulse width mean value through a filtering algorithm.
Further, the processor 1001 may call the generation program of the line synchronization signal stored in the memory 1002, and also perform the following operations:
taking a horizontal position signal of the reflector obtained after the reflector is horizontally adjusted as the sinusoidal signal;
after the step of generating the line synchronizing signal according to the rising edge of the second pulse signal after the delay processing and the period of lighting the pixels in the line, the method further includes:
and acquiring a pre-stored frame synchronization signal and an image data signal, and controlling the laser to emit a laser beam corresponding to the image data signal to the reflector according to the frame synchronization signal and the line synchronization signal so as to reflect, project and image.
Further, the processor 1001 may call the generation program of the line synchronization signal stored in the memory 1002, and also perform the following operations:
when the image data signal is received, generating a reflection driving signal according to the image data signal, and generating a frame synchronization signal corresponding to the reflection driving signal;
and adjusting the position of the reflector by using the reflection driving signal, and obtaining a position signal of the reflector, wherein the position signal comprises a horizontal position signal and a vertical position signal.
Further, the processor 1001 may call the generation program of the line synchronization signal stored in the memory 1002, and also perform the following operations:
and carrying out time delay correction processing on the frame synchronization signal so as to enable the frame synchronization signal to correspond to the position signal, and taking the frame synchronization signal as the pre-stored frame synchronization signal.
Referring to fig. 2, in an embodiment, the method for generating the line synchronization signal includes:
and step S10, filtering and amplifying the received sinusoidal signal, and converting the sinusoidal signal into a first pulse signal.
In this embodiment, the terminals such as the laser reflective projection module, the laser reflective projection system, and the laser reflective projector may receive the image data signal from the image input interface. Of course, the terminal may buffer the received image data through the data buffering module. The video input interface is used for receiving image data output from a PC, a set-top box, or the like and processing the image data.
The terminal of the embodiment can comprise a laser and an MEMS (micro electro mechanical system), wherein under the control of the MEMS, a reflector of the MEMS swings around two axes in the horizontal direction and the vertical direction; the laser is used for controlling the brightness of RGB (red, green, blue) three-color laser, and the pixel data of the image received from the image input interface is simultaneously lightened by the RGB three-color laser and synthesized into a pixel color so as to generate a laser beam corresponding to the image data signal, and the laser beam is emitted to the reflector of the MEMS to be reflected and projected to form an image on the corresponding light curtain.
When the terminal receives the image data signal or acquires the image data signal buffered in the data buffer module, the MEMS controller may be controlled according to the image data signal, a reflection driving signal for driving the MEMS to adjust the angle position of the reflecting mirror is generated, and a frame synchronization signal corresponding to the reflection driving signal is generated.
After the reflection driving signal is generated, the mirror of the MEMS is controlled to adjust the reflection angle position according to the reflection driving signal, and accordingly, the mirror is driven to operate in the vertical direction according to the vertical driving signal in the reflection driving signal, and the mirror is driven to operate in the horizontal reverse direction according to the vertical driving signal in the reflection driving signal. After the position of the reflector is adjusted, the pressure sensor on the MEMS body can feed back and output a position signal corresponding to the reflector, wherein the position signal comprises a vertical position signal and a horizontal position signal, and the vertical position signal is a position signal of the MEMS in the vertical direction fed back by the pressure sensor on the MEMS body and is strictly consistent with the position of the reflector in vertical movement; the horizontal position signal is a position signal of the MEMS in the horizontal direction fed back by a pressure sensor on the MEMS body and is strictly consistent with the position of the horizontal movement of the reflector. It should be noted that the horizontal position signal is a sine wave type signal, that is, the horizontal position signal may be the sine signal.
The terminal of this embodiment may further include a filter amplifier and a voltage comparator, where the filter amplifier is configured to filter and amplify the received sinusoidal signal, and the voltage comparator is configured to perform analog-to-digital conversion on the filtered and amplified sinusoidal signal into a pulse signal.
Specifically, referring to fig. 7, the sinusoidal signal V0 is a horizontal position signal for the MEMS body feedback output to move in the horizontal direction, the sinusoidal signal V0 is generated by the piezoelectric sensor on the MEMS body from the horizontal drive signal in the reflected drive signal. When the sinusoidal signal V0 output by the MEMS feedback is received, the sinusoidal signal V0 is subjected to filtering amplification through a filtering amplifier or a filtering amplification module so as to increase the amplitude of the sinusoidal signal V0, so that the voltage amplitude of the sinusoidal signal is in a required range, and therefore a line synchronization signal generated according to the sinusoidal signal can be enough to light the laser. The filtered and amplified sinusoidal signal V1 has a certain phase shift value from the original sinusoidal signal V0.
The sinusoidal signal V1 after filtering and amplifying is analog-to-digital converted by a voltage comparator or a voltage comparison circuit, specifically, a reference voltage u is obtained, the sinusoidal signal V1 after filtering and amplifying is input at the non-inverting terminal of the voltage comparator, and the reference voltage u is input at the inverting input terminal. The filtered and amplified sinusoidal signal V1, after passing through the voltage comparator, will obtain the first pulse signal V2 with peak value equal to the reference voltage, because the part of the filtered and amplified sinusoidal signal V1 greater than the reference voltage has symmetrical waveform, no matter the peak value of the filtered and amplified sinusoidal signal V1, the center point of the high level and/or the low level of the first pulse signal V2 coincides with the peak value point of the filtered and amplified sinusoidal signal V1.
And step S20, generating a second pulse signal according to the high-level pulse width and the pulse center point of the first pulse signal.
In this embodiment, the laser or the laser control system may include a laser controller. Referring to fig. 7, according to the pulse width and the pulse center of each high level of the first pulse signal V2, a pulse signal with a rising edge coinciding with the pulse center is generated by the laser controller from the pulse center of the high level of the first pulse signal V2, and a half-pulse-width average value is calculated from the pulse width of each high level of the first pulse signal V2, and the half-pulse-width average value is used as the pulse width of the pulse signal with the rising edge coinciding with the pulse center, that is, a pulse signal with the rising edge coinciding with the pulse center of the high level of the first pulse signal V2 and the pulse width equal to the half-pulse-width average value is generated, so that the generated pulse signal is used as the second pulse signal V3. The rising edge of the second pulse signal V3 is consistent with the peak point time of the sine signal V1 after filtering and amplification.
The half-pulse-width average value is a half value of the average value of the pulse widths of the first pulse signal V2. In this way, the influence of noise on the second pulse signal V3 is greatly reduced.
And step S30, performing delay processing on the second pulse signal for a preset time to make the rising edge of the second pulse signal correspond to the peak value of the sinusoidal signal.
Referring to fig. 7, since the filtered and amplified sinusoidal signal V1 has a certain phase shift value from the original sinusoidal signal V0, the pulse signal obtained by analog-to-digital conversion based on the filtered and amplified sinusoidal signal V1 has a certain time delay from the original sinusoidal signal V0. Since the hardware processing circuit of the MEMS piezoelectric feedback signal is fixed, the phase shift of the sinusoidal signal V0 is fixed when the circuit processing is performed, so that the second pulse signal may be delayed for a preset time according to the phase shift value between the sinusoidal signal V0 and the filtered and amplified sinusoidal signal V1, so that the rising edge of the second pulse signal V4 is correspondingly overlapped with the peak point of the sinusoidal signal V0.
For example, when the time delay between the sinusoidal signal V0 and the filtered and amplified sinusoidal signal V1 is T, the second pulse signal V3 is delayed for T time accordingly, so as to ensure that the rising edge of the delayed second pulse signal V4 coincides with the position signal of the MEMS body, that is, the peak point of the sinusoidal signal V0.
And step S40, acquiring the period of the line lighting pixels, and generating a line synchronization signal according to the rising edge of the second pulse signal after the delay processing and the period of the line lighting pixels.
The period of one sinusoidal signal V0 corresponds to an integer multiple of the pixel period, where the pixel period includes a period of line-lit pixels corresponding to the number of pixels required to be lit for a row of pixels displayed and a period of line-unlit pixels corresponding to pixels other than the pixels required to be lit for a row of pixels displayed.
Referring to fig. 7, when the second pulse signal V4 after the delay processing is at the rising edge, two line synchronization pulses are generated correspondingly, the pulse width of the generated line synchronization pulses is equal to the period of the line lighting pixels, and the center point of the pulse is coincided correspondingly with the rising edge or the falling edge of the sinusoidal signal V0 to obtain the line synchronization signal V5.
It should be noted that, since the rising edge of the delayed second pulse signal V4 corresponds to the peak value of the sinusoidal signal V0, and each rising edge of the delayed second pulse signal V4 triggers two line synchronization pulses, where each line synchronization pulse correspondingly controls the lighting of the pixels of one line of pixel lines, in order to make the pixels lighted by each pixel line equal, the central point of each pulse of the line synchronization signal V5 needs to be correspondingly overlapped with the rising edge or the falling edge of the sinusoidal signal V0, that is, in the period of one sinusoidal signal, the lighting period of two lines of pixel lines corresponds to.
For example, 3000 pixel cycles correspond to a cycle of a sine signal, the pixel cycle corresponding to each row of pixel rows is 1500, and when the cycle of lighting the pixels in a row is 1000, the cycles of corresponding to the non-lighting pixels on both sides of each row synchronization pulse are 250 respectively, that is, the cycle of corresponding to the non-lighting pixels between two row synchronization pulses is 500.
In one embodiment, the received sinusoidal signal is filtered and amplified and converted into a first pulse signal; generating a second pulse signal according to the pulse width and the pulse center point of the high level of the first pulse signal; performing time delay processing on the second pulse signal for a preset time to enable the rising edge of the second pulse signal to correspond to the peak value of the sinusoidal signal; and acquiring the period of the line lighting pixels, and generating a line synchronization signal according to the rising edge of the second pulse signal after delay processing and the period of the line lighting pixels. Therefore, the sinusoidal signal output and fed back by the MEMS is subjected to filtering amplification and analog-to-digital conversion and then is used as the horizontal line synchronization signal for controlling laser lighting, so that the influence of phase shift caused by the resonance state of the driving circuit and the MEMS is avoided, the problem that the received sinusoidal signal influences the line synchronization signal due to frequency change or amplitude change is effectively solved, the real-time, accurate and stable line synchronization signal is obtained, and normal synchronous work of each projection module is ensured.
In a second embodiment, as shown in fig. 3, based on the embodiment shown in fig. 2, the step of filtering, amplifying and converting the received sinusoidal signal into the first pulse signal includes:
and step S50, filtering and amplifying the received sinusoidal signal to increase the amplitude of the sinusoidal signal.
And step S51, obtaining a reference voltage, performing analog-to-digital conversion on the filtered and amplified sinusoidal signal according to the reference voltage, and generating the first pulse signal with the peak value equal to the reference voltage.
In this embodiment, referring to fig. 7, the sinusoidal signal V0 is a horizontal position signal of the MEMS body feedback output moving in the horizontal direction, and the sinusoidal signal V0 is generated by the piezoelectric sensor on the MEMS body according to the horizontal driving signal in the reflection driving signal. When the sinusoidal signal V0 output by the MEMS feedback is received, the sinusoidal signal V0 is subjected to filtering amplification through a filtering amplifier or a filtering amplification module so as to increase the amplitude of the sinusoidal signal V0, so that the voltage amplitude of the sinusoidal signal is in a required range, and therefore a line synchronization signal generated according to the sinusoidal signal can be enough to light the laser. The filtered and amplified sinusoidal signal V1 has a certain phase shift value from the original sinusoidal signal V0.
The sinusoidal signal V1 after filtering and amplifying is analog-to-digital converted by a voltage comparator or a voltage comparison circuit, specifically, a reference voltage u is obtained, the sinusoidal signal V1 after filtering and amplifying is input at the non-inverting terminal of the voltage comparator, and the reference voltage u is input at the inverting input terminal. After the filtered and amplified sinusoidal signal V1 passes through the voltage comparator, the first pulse signal V2 with the peak value equal to the reference voltage is obtained, and since the waveform of the part of the filtered and amplified sinusoidal signal V1 larger than the reference voltage is symmetrical, no matter the size of the large peak value of the filtered and amplified sinusoidal signal V1, the center point of the high level and/or the low level of the first pulse signal V2 coincides with the peak point of the filtered and amplified sinusoidal signal V1.
In one embodiment, the received sinusoidal signal is filtered and amplified to increase the amplitude of the sinusoidal signal; and acquiring a reference voltage, and performing analog-to-digital conversion on the filtered and amplified sinusoidal signal according to the reference voltage to generate the first pulse signal with the peak value equal to the reference voltage. Therefore, the line synchronization abnormity caused by amplitude change of the feedback signal, different amplitude of the feedback signal of the projector module or resonance frequency change of the driving MEMS (resonance frequency of each MEMS is different, and resonance frequency points of the MEMS can deviate when the MEMS works for a long time) when only the voltage comparator is used for generating the pulse edge as the synchronous signal is avoided.
In a third embodiment, as shown in fig. 4, based on the above embodiments of fig. 2 to 3, the step of generating a second pulse signal according to the pulse width and the pulse center point of the high level of the first pulse signal includes:
and step S60, obtaining a pulse width and a pulse center point of each high level of the first pulse signal.
And step S61, calculating to obtain a half pulse width mean value according to the pulse width of each high level.
And step S62, generating the second pulse signal with a rising edge coinciding with the center point of the high-level pulse and a high-level pulse width equal to the half-pulse-width average value.
In this embodiment, the laser or the laser control system may include a laser controller. Referring to fig. 7, according to the pulse width and the pulse center of each high level of the first pulse signal V2, a pulse signal with a rising edge coinciding with the pulse center is generated by the laser controller from the pulse center of the high level of the first pulse signal V2, and a half-pulse-width average value is calculated from the pulse width of each high level of the first pulse signal V2, and the half-pulse-width average value is used as the pulse width of the pulse signal with the rising edge coinciding with the pulse center, that is, a pulse signal with the rising edge coinciding with the pulse center of the high level of the first pulse signal V2 and the pulse width equal to the half-pulse-width average value is generated, so that the generated pulse signal is used as the second pulse signal V3. The rising edge of the second pulse signal V3 is consistent with the peak point time of the sine signal V1 after filtering and amplification.
Specifically, the laser controller is controlled to count the pulse width of each high level of the first pulse signal V2 through a high-speed clock signal, perform summation calculation, calculate an average value according to the summation result to obtain an average value of the pulse width of each high level of the first pulse signal V2, and then take a half value of the average value of the pulse widths as a half pulse width average value through a filtering algorithm.
In this way, generation of the second pulse signal V3 whose rising edge coincides with the center point of the high-level pulse of the first pulse signal V2 is achieved, wherein the high-level pulse width of the second pulse signal V3 is equal to the half-pulse-width average value, i.e., the pulse width of the second pulse signal V3 is equal to half the value of the average value of all the pulse widths of the first pulse signal V2.
In one embodiment, a pulse width and a pulse center point of each high level of the first pulse signal are obtained; calculating to obtain a half pulse width mean value according to the pulse width of each high level; and generating the second pulse signal with the rising edge coinciding with the central point of the high-level pulse and the high-level pulse width equal to the average value of the half pulse widths. Therefore, through the filtering algorithm for counting for multiple times and taking the average value, the noise reduction inside the processing circuit is realized, and the influence of the noise on the second pulse signal V3 is greatly reduced.
In a fourth embodiment, as shown in fig. 5, on the basis of the above embodiments of fig. 2 to 4, the method for generating a line synchronization signal is applied to a laser projection assembly, where the laser projection assembly includes a laser and a mirror, and before the step of filtering, amplifying and converting the received sinusoidal signal into the first pulse signal, the method further includes:
and step S70, taking the horizontal position signal of the reflector obtained after the horizontal adjustment of the reflector as the sine signal.
After the step of generating the line synchronizing signal according to the rising edge of the second pulse signal after the delay processing and the period of lighting the pixels in the line, the method further includes:
step S80, acquiring a pre-stored frame synchronization signal and an image data signal, and controlling the laser to emit a laser beam corresponding to the image data signal to the mirror according to the frame synchronization signal and the line synchronization signal, so as to perform reflective projection imaging.
In this embodiment, when the terminal receives the image data signal or acquires the image data signal buffered in the data buffering module, the MEMS controller may be controlled according to the image data signal, a reflection driving signal for driving the MEMS to adjust the angular position of the mirror, and a frame synchronization signal corresponding to the reflection driving signal may be generated.
After the reflection driving signal is generated, the mirror of the MEMS is controlled to adjust the reflection angle position according to the reflection driving signal, and accordingly, the mirror is driven to operate in the vertical direction according to the vertical driving signal in the reflection driving signal, and the mirror is driven to operate in the horizontal reverse direction according to the vertical driving signal in the reflection driving signal. After the position of the reflector is adjusted, the pressure sensor on the MEMS body can feed back and output a position signal corresponding to the reflector, wherein the position signal comprises a vertical position signal and a horizontal position signal, and the vertical position signal is a position signal of the MEMS in the vertical direction fed back by the pressure sensor on the MEMS body and is strictly consistent with the position of the reflector in vertical movement; the horizontal position signal is a position signal of the MEMS in the horizontal direction fed back by a pressure sensor on the MEMS body and is strictly consistent with the position of the horizontal movement of the reflector.
It should be noted that the horizontal position signal is a sine wave type signal, and the horizontal position signal may be the sine signal, that is, the horizontal position signal of the mirror obtained after the mirror is horizontally adjusted is used as the sine signal.
The terminal controls the laser to light pixel information corresponding to the image data signal by using three primary colors laser according to the image data signal, the frame synchronization signal and a line synchronization signal generated according to the horizontal position signal, and transmits the generated laser beam to the reflector with the adjusted angle position to reflect, project and image onto the light curtain, so that the synchronization of the image information and the MEMS operation is realized, and stable picture information is output. It should be noted that the pre-stored frame synchronization signal may be a frame synchronization signal after performing delay correction processing.
It should be noted that the laser may be a laser component, or may be a laser system, and the laser may include a laser driving module for converting a digital signal into an analog signal.
In an embodiment, a horizontal position signal of the mirror, which is obtained by horizontally adjusting the mirror, is used as the sinusoidal signal to obtain a pre-stored frame synchronization signal and an image data signal, and the laser is controlled to emit a laser beam corresponding to the image data signal to the mirror according to the frame synchronization signal and the line synchronization signal to reflect projection imaging. Therefore, the synchronous control of the line synchronous signal and the frame synchronous signal of the laser reflection projection is realized, so that the synchronization of each frame of projection picture and the pixel line display corresponding to each frame of projection picture is realized, and the continuous output of the projection picture is ensured.
In a fifth embodiment, as shown in fig. 6, on the basis of the embodiments of fig. 2 to 5, before the step of using the horizontal position signal of the mirror obtained by horizontally adjusting the mirror as the sinusoidal signal, the method further includes:
step S90, upon receiving the image data signal, generating a reflection driving signal from the image data signal, and generating a frame synchronization signal corresponding to the reflection driving signal.
And step S91, adjusting the position of the reflector by using the reflection driving signal, and obtaining a position signal of the reflector, wherein the position signal comprises a horizontal position signal and a vertical position signal.
Step S92, performing a delay correction process on the frame synchronization signal to make the frame synchronization signal correspond to the position signal, and using the frame synchronization signal as the pre-stored frame synchronization signal.
In this embodiment, when the terminal receives the image data signal or acquires the image data signal buffered in the data buffering module, the MEMS controller may be controlled according to the image data signal, a reflection driving signal for driving the MEMS to adjust the angular position of the mirror, and a frame synchronization signal corresponding to the reflection driving signal may be generated.
After the reflection driving signal is generated, the mirror of the MEMS is controlled to adjust the reflection angle position according to the reflection driving signal, and accordingly, the mirror is driven to operate in the vertical direction according to the vertical driving signal in the reflection driving signal, and the mirror is driven to operate in the horizontal reverse direction according to the vertical driving signal in the reflection driving signal. After the position of the reflector is adjusted, the pressure sensor on the MEMS body can feed back and output a position signal corresponding to the reflector, wherein the position signal comprises a vertical position signal and a horizontal position signal, and the vertical position signal is a position signal of the MEMS in the vertical direction fed back by the pressure sensor on the MEMS body and is strictly consistent with the position of the reflector in vertical movement; the horizontal position signal is a position signal of the MEMS in the horizontal direction fed back by a pressure sensor on the MEMS body and is strictly consistent with the position of the horizontal movement of the reflector.
Since the frame synchronization signal generated at the beginning corresponds to the vertical driving signal in the reflection driving signal, and the MEMS is used to feed back the position signal after the reflection mirror adjusts the reflection angle position, and has a certain phase shift value with the reflection driving signal, it is necessary to perform the delay correction process on the original frame synchronization signal first, so that the frame synchronization signal corresponds to the vertical position signal in the position signal, even if the rising edge of the frame synchronization signal after the delay correction process corresponds to the center point of the rising edge of the vertical position signal in the position signal, and the falling edge of the frame synchronization signal corresponds to the peak point of the vertical position signal.
In this way, it is achieved that the frame synchronization signal corresponds to the position signal. And taking the frame synchronization signal after the delay correction processing as the pre-stored frame synchronization signal.
It should be noted that, in the image display, each frame image is composed of a certain number of pixel lines, and the line synchronization signal is generated according to the horizontal position signal in the position signal, i.e. the sinusoidal signal, the phase shift value between the horizontal position signal and the horizontal driving signal is equal to the phase shift value between the vertical position signal and the vertical driving signal, and since the initially generated frame synchronization signal corresponds to the vertical driving signal, the frame synchronization signal is subjected to the delay correction processing so as to correspond to the vertical position signal, that is, the frame synchronization signal and the line synchronization signal can be realized, i.e. the pixel lines of each frame image picture and each frame picture are synchronously displayed.
In one embodiment, upon receiving the image data signal, generating a reflection driving signal according to the image data signal, and generating a frame synchronization signal corresponding to the reflection driving signal; adjusting the position of a reflector by using the reflection driving signal, and obtaining a position signal of the reflector, wherein the position signal comprises a horizontal position signal and a vertical position signal; and carrying out time delay correction processing on the frame synchronization signal so as to enable the frame synchronization signal to correspond to the position signal, and taking the frame synchronization signal as the pre-stored frame synchronization signal. Thus, synchronization of the frame synchronization signal and the line synchronization signal is achieved.
In addition, the present invention further provides a laser projection assembly, which includes a laser, an MEMS, a filter amplifier, and a voltage comparator, wherein the MEMS has a mirror, the mirror is connected to the filter amplifier, the filter amplifier is connected to the voltage comparator, the voltage comparator is connected to the laser, the filter amplifier is configured to filter and amplify a received sinusoidal signal, the voltage comparator is configured to perform analog-to-digital conversion on the filtered and amplified sinusoidal signal to a pulse signal, and the laser projection assembly includes:
the laser projection assembly comprises a memory, a processor and a line synchronization signal generation program which is stored on the memory and can run on the processor, wherein the line synchronization signal generation program realizes the steps of the line synchronization signal generation method when being executed by the processor.
Furthermore, the present invention also provides a laser projector comprising the laser projection assembly as described above, the laser projector comprising:
the laser projector comprises a memory, a processor and a line synchronization signal generation program stored on the memory and operable on the processor, wherein the line synchronization signal generation program, when executed by the processor, implements the steps of the line synchronization signal generation method as described above.
Furthermore, the present invention also provides a computer-readable storage medium, which is characterized by comprising a program for generating a horizontal synchronization signal, wherein the program for generating a horizontal synchronization signal is executed by a processor to implement the steps of the method for generating a horizontal synchronization signal according to the above embodiment.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a television, a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A method for generating a horizontal synchronization signal, the method comprising:
when receiving an image data signal, generating a reflection driving signal according to the image data signal, and generating a frame synchronization signal corresponding to the reflection driving signal;
adjusting the position of a reflector by using the reflection driving signal, and obtaining a position signal of the reflector, wherein the position signal comprises a horizontal position signal and a vertical position signal;
taking a horizontal position signal of the reflector obtained after the reflector is horizontally adjusted as a sinusoidal signal;
filtering and amplifying the received sinusoidal signal, and converting the sinusoidal signal into a first pulse signal;
generating a second pulse signal according to the pulse width and the pulse center point of the high level of the first pulse signal;
performing time delay processing on the second pulse signal for a preset time to enable the rising edge of the second pulse signal to correspond to the peak value of the sinusoidal signal;
and correspondingly triggering and generating two line synchronization pulses when the second pulse signal after the time delay processing is at a rising edge, wherein the pulse width of the generated line synchronization pulses is equal to the period of line lighting pixels, and the pulse center points of the line synchronization pulses are correspondingly superposed with the rising edge or the falling edge of the sinusoidal signal, so as to obtain the line synchronization signals.
2. The method for generating a line synchronizing signal according to claim 1, wherein the step of filtering and amplifying the received sinusoidal signal and converting the sinusoidal signal into the first pulse signal comprises:
filtering and amplifying the received sinusoidal signal to increase the amplitude of the sinusoidal signal;
and acquiring a reference voltage, and performing analog-to-digital conversion on the filtered and amplified sinusoidal signal according to the reference voltage to generate the first pulse signal with the peak value equal to the reference voltage.
3. The method of generating a line synchronizing signal according to claim 1, wherein the step of generating a second pulse signal based on a pulse width and a pulse center point of a high level of the first pulse signal comprises:
acquiring the pulse width and the pulse center point of each high level of the first pulse signal;
calculating to obtain a half pulse width mean value according to the pulse width of each high level;
and generating the second pulse signal with the rising edge coinciding with the central point of the high-level pulse and the high-level pulse width equal to the average value of the half pulse widths.
4. The method for generating a horizontal synchronizing signal according to claim 3, wherein the step of calculating a half-pulse-width average value according to the pulse width of each of the high levels comprises:
summing the pulse widths of the high levels, and calculating an average value according to the summation result to obtain a pulse width average value;
and taking the half value of the pulse width mean value as the half pulse width mean value through a filtering algorithm.
5. The method for generating a line synchronizing signal according to claim 1, wherein the method for generating a line synchronizing signal is applied to a laser projection module, the laser projection module comprising a laser and a mirror;
when the second pulse signal after the delay processing is at a rising edge, correspondingly triggering to generate two line synchronization pulses, where a pulse width of the generated line synchronization pulse is equal to a period of a line lighting pixel, and a pulse center point of the line synchronization pulse is correspondingly overlapped with the rising edge or the falling edge of the sinusoidal signal, so as to obtain the line synchronization signal, the method further includes:
and acquiring a pre-stored frame synchronization signal and an image data signal, and controlling the laser to emit a laser beam corresponding to the image data signal to the reflector according to the frame synchronization signal and the line synchronization signal so as to reflect, project and image.
6. The method for generating a line synchronizing signal according to claim 1, wherein the step of adjusting the position of the mirror by the reflection driving signal and obtaining the position signal of the mirror is followed by the step of:
and carrying out time delay correction processing on the frame synchronization signal so as to enable the frame synchronization signal to correspond to the position signal, and taking the frame synchronization signal as a pre-stored frame synchronization signal.
7. A laser projection assembly comprising a laser, a MEMS, a filter amplifier, and a voltage comparator, wherein the MEMS has a mirror, the mirror is connected to the filter amplifier, the filter amplifier is connected with the voltage comparator, the voltage comparator is connected with the laser, the filter amplifier is used for filtering and amplifying the received sinusoidal signals, the voltage comparator is used for carrying out analog-to-digital conversion on the filtered and amplified sinusoidal signals into pulse signals, the laser projection component comprises a memory, a processor and a generation program of a line synchronization signal stored on the memory and capable of running on the processor, the program for generating a line synchronization signal, when executed by the processor, implements the steps of the method for generating a line synchronization signal according to any one of claims 1 to 6.
8. A laser projector comprising a laser projection assembly according to claim 7, wherein the steps of the method for generating a line synchronization signal according to any one of claims 1 to 6 are implemented by a processor in the laser projection assembly when the program for generating a line synchronization signal is executed on the processor.
9. A computer-readable storage medium, characterized in that a program for generating a line synchronization signal is stored on the computer-readable storage medium, and when the program for generating a line synchronization signal is executed by a processor, the steps of the method for generating a line synchronization signal according to any one of claims 1 to 6 are implemented.
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