CN109600591B - Projector, method for generating line synchronization signal of projector, and computer-readable storage medium - Google Patents
Projector, method for generating line synchronization signal of projector, and computer-readable storage medium Download PDFInfo
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- CN109600591B CN109600591B CN201811551650.XA CN201811551650A CN109600591B CN 109600591 B CN109600591 B CN 109600591B CN 201811551650 A CN201811551650 A CN 201811551650A CN 109600591 B CN109600591 B CN 109600591B
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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
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
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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]
- H04N9/3179—Video signal processing therefor
- H04N9/3185—Geometric adjustment, e.g. keystone or convergence
Abstract
The invention discloses a method for generating a projector line synchronizing signal, which comprises the following steps: determining a phase shift between a first sinusoidal signal and a second sinusoidal signal, wherein the first sinusoidal signal is converted into the second sinusoidal signal after being filtered and amplified; acquiring a first pulse signal, wherein the first pulse signal is obtained by converting the second sinusoidal signal; and delaying the first pulse signal according to the phase shift to generate a line synchronization signal, wherein the high level of the line synchronization signal is positioned at the rising edge and the falling edge of the first sinusoidal signal, and a mirror of a micro electro mechanical system in the projector moves at the rising edge and the falling edge. The invention also discloses a projector and a computer readable storage medium. The projector disclosed by the invention can eliminate image deformity caused by sinusoidal signal phase shift.
Description
Technical Field
The present invention relates to the field of projector technologies, and in particular, to a projector, a method for generating a line synchronization signal of the projector, and a computer-readable storage medium.
Background
The projectors are of various types, and the laser beam scanning projectors are more and more popular in the market due to the advantages of simple structure, small size, small optical path loss, low power consumption, wide color range, high contrast, high resolution, no need of focusing and the like.
In the existing laser projection technology, a laser projects laser beams of three primary colors onto a mirror of a Micro Electro Mechanical Systems (MEMS), so that the mirror can reflect the laser beams to a position opposite to a light curtain by driving the mirror, thereby forming an image. The movement of the mirror can be divided into horizontal movement and vertical movement, and the projector generates a line synchronization signal of the laser according to a driving signal when the mirror moves horizontally.
When the amplitude of the sinusoidal signal changes, the MEMS body generates resonance, the MEMS resonant frequency point moves after long-time working, and the filter amplifier converts the sinusoidal signal, the sinusoidal signal is subjected to phase shift, so that the movement position of the MEMS and the line synchronization of the lighting of the laser are influenced, the position of a laser beam on a light curtain is different from the set position, and the image projected by the projector is deformed.
Disclosure of Invention
The invention mainly aims to provide a projector, a line synchronization signal generation method thereof and a computer readable storage medium, and aims to solve the problem of image deformity projected by the projector.
In order to achieve the above object, the present invention provides a method for generating a projector line synchronization signal, including:
determining a phase shift between a first sinusoidal signal and a second sinusoidal signal, wherein the first sinusoidal signal is converted into the second sinusoidal signal after being filtered and amplified;
acquiring a first pulse signal, wherein the first pulse signal is obtained by converting the second sinusoidal signal;
and delaying the first pulse signal according to the phase shift to generate a line synchronization signal, wherein the high level of the line synchronization signal is positioned at the rising edge and the falling edge of the first sinusoidal signal, and a mirror of a micro electro mechanical system in the projector moves at the rising edge and the falling edge.
In one embodiment, the delaying the first pulse signal according to the phase shift to generate the line synchronization signal includes:
performing time delay processing on the first pulse signal according to the phase shift to generate a second pulse signal and a third pulse signal, wherein the high level of the second pulse signal is located at the rising edge of the first sinusoidal signal, and the high level of the third pulse signal is located at the falling edge of the first sinusoidal signal;
and integrating the second pulse signal and the third pulse signal to generate a line synchronization signal.
In an embodiment, the step of delaying the first pulse signal according to the phase shift to generate a second pulse signal and a third pulse signal includes:
calculating a first delay time length of the first pulse signal according to the phase shift;
delaying the first pulse signal according to a first delay time length to generate a fourth pulse signal, wherein a rising edge of a high level of the fourth pulse signal is coincided with a peak point of the first sinusoidal signal;
and respectively carrying out time delay processing on the fourth pulse signal for a first preset time length and a second preset time length to generate a second pulse signal and a third pulse signal.
In one embodiment, the step of calculating the first delay time duration of the first pulse signal according to the phase shift comprises:
calculating the actual time delay duration of the second sinusoidal signal relative to the first sinusoidal signal according to the phase shift;
and acquiring the duration of the high level of the first pulse signal, and adding the actual delay time to half of the duration to obtain the first delay time.
In an embodiment, the step of delaying the first pulse signal according to the phase shift to generate a second pulse signal and a third pulse signal includes:
determining a second delay time length and a third delay time length according to the phase shift;
and respectively carrying out delay processing on the first pulse signal for a second delay time and a third delay time to generate a second pulse signal and a third pulse signal.
In an embodiment, the step of determining the second delay time length and the third delay time length according to the phase shift includes:
calculating the actual time delay duration of the second sinusoidal signal relative to the first sinusoidal signal according to the phase shift;
acquiring a first preset time length, a second preset time length and a duration time length of a high level of the first pulse signal;
and determining the second delay time length according to the actual delay time length, the duration time length and the first preset time length, and determining the third delay time length according to the actual delay time length, the duration time length and the second preset time length.
In one embodiment, the step of determining a phase shift between the first sinusoidal signal and the second sinusoidal signal comprises:
acquiring variable phase shift generated by the change of the peak voltage of the second sinusoidal signal, and quantitative phase shift generated by converting the first sinusoidal signal into the second sinusoidal signal;
determining the phase shift from the quantitative phase shift and the variable phase shift.
In one embodiment, the step of obtaining the variable phase shift generated by the peak voltage variation of the second sinusoidal signal comprises:
acquiring a reference voltage corresponding to the first pulse signal converted from the second sinusoidal signal, and a peak voltage of the second sinusoidal signal;
calculating the variable phase shift from the reference voltage and the peak voltage.
In order to achieve the above object, the present invention further provides a projector, where the projector includes a mems controller, a mems, a filter amplifier, and a voltage comparator connected in sequence, the voltage comparator is connected to the mems controller, an analog-to-digital converter is disposed on a connection circuit between the filter amplifier and the mems controller, the projector further includes a memory and a program for generating a projector line synchronization signal, the program being stored in the memory and being capable of being run by the mems controller, and the program for generating the projector line synchronization signal is executed by the mems controller to implement the steps of the method for generating the projector line synchronization signal.
To achieve the above object, the present invention also provides a computer-readable storage medium storing a program for generating a projector line synchronization signal, which when executed by a processor, implements the steps of the method for generating a projector line synchronization signal as described above.
The projector determines the phase shift between a first sinusoidal signal and a second sinusoidal signal converted after the first sinusoidal signal is filtered and amplified, acquires a pulse signal converted by the second sinusoidal signal, and performs time delay processing on the pulse signal according to the phase shift, so that the high level of the line synchronization signal generated after the time delay processing is positioned at the rising edge and the falling edge of the first sinusoidal signal; because the reflector of the micro-electro-mechanical system in the projector moves on the rising edge and the falling edge of the first sinusoidal signal, the line synchronization signal and the position of the reflector are strictly synchronized, so that the laser beam can be projected to a set position on the light curtain, and the problem of image deformity caused by phase shift between the sinusoidal signals is solved.
Drawings
Fig. 1 is a schematic hardware configuration diagram of a projector according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of a method for generating a horizontal synchronization signal of a projector according to the present invention;
FIG. 3 is a detailed flowchart of step S300 in FIG. 2;
FIG. 4 is a variation diagram of a first sinusoidal signal generating line synchronizing signal according to the present invention;
FIG. 5 is a flowchart illustrating a method for generating a horizontal synchronization signal of a projector according to a second embodiment of the present invention;
fig. 6 is a schematic diagram of the operation of the projector of 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 main solution of the embodiment of the invention is as follows: determining a phase shift between a first sinusoidal signal and a second sinusoidal signal, wherein the first sinusoidal signal is converted into the second sinusoidal signal after being filtered and amplified; acquiring a first pulse signal, wherein the first pulse signal is obtained by converting the second sinusoidal signal; and delaying the first pulse signal according to the phase shift to generate a line synchronization signal, wherein the high level of the line synchronization signal is positioned at the rising edge and the falling edge of the first sinusoidal signal, and a mirror of a micro electro mechanical system in the projector moves at the rising edge and the falling edge.
Because the reflector of the micro-electro-mechanical system in the projector moves on the rising edge and the falling edge of the first sinusoidal signal, the line synchronization signal and the position of the reflector are strictly synchronized, so that the laser beam can be projected to a set position on the light curtain, and the problem of image deformity caused by phase shift between the sinusoidal signals is solved.
As an implementation, the projector may be as shown in fig. 1.
The embodiment of the invention relates to a projector, which comprises: a processor 101, e.g. a CPU, a memory 102, a communication bus 103. Wherein a communication bus 103 is used for enabling the connection communication between these components.
The memory 102 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). As shown in fig. 1, a memory 102, which is a kind of computer storage medium, may include therein a program for generating a projector line synchronization signal; and the processor 101 may be configured to call the program for generating the projector line synchronization signal stored in the memory 102, and perform the following operations:
determining a phase shift between a first sinusoidal signal and a second sinusoidal signal, wherein the first sinusoidal signal is converted into the second sinusoidal signal after being filtered and amplified;
acquiring a first pulse signal, wherein the first pulse signal is obtained by converting the second sinusoidal signal;
and delaying the first pulse signal according to the phase shift to generate a line synchronization signal, wherein the high level of the line synchronization signal is positioned at the rising edge and the falling edge of the first sinusoidal signal, and a mirror of a micro electro mechanical system in the projector moves at the rising edge and the falling edge.
In one embodiment, the processor 101 may be configured to call a program for generating a projector line synchronization signal stored in the memory 102, and perform the following operations:
performing time delay processing on the first pulse signal according to the phase shift to generate a second pulse signal and a third pulse signal, wherein the high level of the second pulse signal is located at the rising edge of the first sinusoidal signal, and the high level of the third pulse signal is located at the falling edge of the first sinusoidal signal;
and integrating the second pulse signal and the third pulse signal to generate a line synchronization signal.
In one embodiment, the processor 101 may be configured to call a program for generating a projector line synchronization signal stored in the memory 102, and perform the following operations:
calculating a first delay time length of the first pulse signal according to the phase shift;
delaying the first pulse signal according to a first delay time length to generate a fourth pulse signal, wherein a rising edge of a high level of the fourth pulse signal is coincided with a peak point of the first sinusoidal signal;
and respectively carrying out time delay processing on the fourth pulse signal for a first preset time length and a second preset time length to generate a second pulse signal and a third pulse signal.
In one embodiment, the processor 101 may be configured to call a program for generating a projector line synchronization signal stored in the memory 102, and perform the following operations:
calculating the actual time delay duration of the second sinusoidal signal relative to the first sinusoidal signal according to the phase shift;
and acquiring the duration of the high level of the first pulse signal, and adding the actual delay time to half of the duration to obtain the first delay time.
In one embodiment, the processor 101 may be configured to call a program for generating a projector line synchronization signal stored in the memory 102, and perform the following operations:
determining a second delay time length and a third delay time length according to the phase shift;
and respectively carrying out delay processing on the first pulse signal for a second delay time and a third delay time to generate a second pulse signal and a third pulse signal.
In one embodiment, the processor 101 may be configured to call a program for generating a projector line synchronization signal stored in the memory 102, and perform the following operations:
calculating the actual time delay duration of the second sinusoidal signal relative to the first sinusoidal signal according to the phase shift;
acquiring a first preset time length, a second preset time length and a duration time length of a high level of the first pulse signal;
and determining the second delay time length according to the actual delay time length, the duration time length and the first preset time length, and determining the third delay time length according to the actual delay time length, the duration time length and the second preset time length.
In one embodiment, the processor 101 may be configured to call a program for generating a projector line synchronization signal stored in the memory 102, and perform the following operations:
acquiring variable phase shift generated by the change of the peak voltage of the second sinusoidal signal, and quantitative phase shift generated by converting the first sinusoidal signal into the second sinusoidal signal;
determining the phase shift from the quantitative phase shift and the variable phase shift.
In one embodiment, the processor 101 may be configured to call a program for generating a projector line synchronization signal stored in the memory 102, and perform the following operations:
acquiring a reference voltage corresponding to the first pulse signal converted from the second sinusoidal signal, and a peak voltage of the second sinusoidal signal;
calculating the variable phase shift from the reference voltage and the peak voltage.
According to the scheme, the projector determines the phase shift between the first sinusoidal signal and the second sinusoidal signal converted after the first sinusoidal signal is filtered and amplified, obtains the pulse signal converted from the second sinusoidal signal, and performs delay processing on the pulse signal according to the phase shift, so that the high level of the line synchronization signal generated after the delay processing is positioned at the rising edge and the falling edge of the first sinusoidal signal; because the reflector of the micro-electro-mechanical system in the projector moves on the rising edge and the falling edge of the first sinusoidal signal, the line synchronization signal and the position of the reflector are strictly synchronized, so that the laser beam can be projected to a set position on the light curtain, and the problem of image deformity caused by phase shift between the sinusoidal signals is solved.
Based on the hardware architecture of the projector, the embodiment of the method for generating the projector line synchronization signal is provided.
Referring to fig. 2, fig. 2 is a first embodiment of a method for generating a projector line synchronization signal according to the present invention, where the method for generating a projector line synchronization signal includes the following steps:
step S100, determining a phase shift between a first sinusoidal signal and a second sinusoidal signal, wherein the first sinusoidal signal is converted into the second sinusoidal signal after being filtered and amplified;
in the invention, the projector is a laser beam scanning projector, the projector comprises a micro-electromechanical system controller, a micro-electromechanical system, a filter amplifier and a voltage comparator which are connected in sequence, the voltage comparator is connected with the micro-electromechanical system controller, and an analog-to-digital converter is arranged on a connecting circuit of the filter amplifier and the micro-electromechanical system controller.
When the projector projects, the micro-electro-mechanical system controller outputs a first sinusoidal signal to the micro-electro-mechanical system, so that a reflector in the micro-electro-mechanical system moves horizontally according to the first sinusoidal signal, the micro-electro-mechanical system is provided with a piezoelectric sensor, the micro-electro-mechanical system transmits the first sinusoidal signal to a filter amplifier through the piezoelectric sensor, the filter amplifier filters and amplifies the first sinusoidal signal to convert the first sinusoidal signal into a second sinusoidal signal, the filter amplifier transmits the second sinusoidal signal to a voltage comparator and an analog-to-digital converter, and a reverse input end of the voltage comparator inputs a reference voltage to convert the second sinusoidal signal into a pulse signal through the reference voltage; the analog-to-digital converter also receives the reference voltage from the input voltage comparator, and converts the reference voltage and the second sinusoidal signal into digital signals to be transmitted to the micro-electro-mechanical system controller.
It should be noted that when the first sinusoidal signal is filtered, amplified and converted into the second sinusoidal signal, a fixed phase shift, that is, a quantitative phase shift, is generated; the micro electro mechanical system body can generate resonance, so that a sinusoidal signal output by the micro electro mechanical system can generate phase shift, meanwhile, as the micro electro mechanical system works for a long time, a resonance point of the micro electro mechanical system can move, the movement of the resonance point can also enable the first sinusoidal signal to generate phase shift, namely, the resonance of the micro electro mechanical system and the movement of the resonance point can enable the first sinusoidal signal to generate variable phase shift. In the present invention, the phase shift between the first sinusoidal signal and the second sinusoidal signal refers to the sum of a quantitative phase shift and a variable phase shift. It is understood that the first sinusoidal signal refers to the sinusoidal signal outputted from the mems controller in the present invention, since the resonance of the mems and the shift of the resonance point cause the variable phase shift between the sinusoidal signal received by the mems and the sinusoidal signal outputted by the mems.
The variable phase shift may be calculated by using a peak voltage of the second sinusoidal signal and a reference voltage, and specifically, the mems controller receives the reference voltage and the second sinusoidal signal transmitted by the analog-to-digital converter, so as to obtain the reference voltage and the peak voltage of the second sinusoidal signal, and the variable phase shift may be calculated by dividing the peak voltage by the reference voltage.
Step S200, acquiring a first pulse signal, wherein the first pulse signal is obtained by converting the second sinusoidal signal;
and step S300, performing time delay processing on the first pulse signal according to the phase shift to generate a line synchronization signal, wherein the high level of the line synchronization signal is located at the rising edge and the falling edge of the first sinusoidal signal, and a mirror of a micro electro mechanical system in the projector moves at the rising edge and the falling edge.
The micro electro mechanical system controller is connected with a laser controller in the projector, generates a horizontal synchronizing signal and transmits the horizontal synchronizing signal to the laser controller, so that the laser controller transmits the horizontal synchronizing signal to the laser, and the laser emits a laser beam to a reflector in the micro electro mechanical system.
After the micro electro mechanical system controller obtains the phase shift between the first sinusoidal signal and the second sinusoidal signal, the micro electro mechanical system controller obtains the pulse signal output by the voltage comparator, namely the first pulse signal, and the voltage comparator converts the second sinusoidal signal into the first pulse signal according to the input reference voltage.
The rising edge and the falling edge of the first sinusoidal signal are driving time periods of the mirror, and after obtaining the first pulse signal, the mems controller performs a delay process on the first pulse signal, so as to generate a line synchronization signal, specifically, referring to fig. 3, that is, step S300 includes:
step S310, performing time delay processing on the first pulse signal according to the phase shift to generate a second pulse signal and a third pulse signal, wherein the high level of the second pulse signal is located at the rising edge of the first sinusoidal signal, and the high level of the third pulse signal is located at the falling edge of the first sinusoidal signal;
step S320, integrating the second pulse signal and the third pulse signal to generate a line synchronization signal;
the first pulse signal is converted from the second sinusoidal signal, and the high level of the first pulse signal is converted from each point of the second sinusoidal signal which is larger than the reference voltage, so that the middle point of the high level of the first pulse signal coincides with the peak point of the second pulse signal, and the middle point of the low level of the first pulse signal coincides with the valley point of the second sinusoidal signal.
Due to the phase shift between the first sinusoidal signal and the second sinusoidal signal, the first pulse signal needs to be phase-corrected, so that the high level of the first pulse signal is at the rising edge and the falling edge of the first sinusoidal signal. In this regard, the MEMS control calculates the actual delay time of the first pulse signal based on a phase shift, which is α0The actual delay time is T0，T0＝(α0T2 pi) T, where T is the period duration of the first sinusoidal signal, i.e. the second sinusoidal signal needs to be delayed by T0The first sinusoidal signal can be obtained by restoring, but since the horizontal synchronizing signal is a pulse signal, the first pulse signal needs to be processed to obtain a pulse signal synchronized with the first sinusoidal signal. To this end, for the firstPulse signal to perform T0The high level of the first pulse signal after the delay processing corresponds to the voltage of the first sinusoidal signal which is greater than the reference voltage, but the rising edge and the falling edge of the first sinusoidal signal are the driving time period of the mirror, so that the passing T needs to be further delayed0The first pulse signal of the delay processing is subjected to delay processing.
The starting timing time point of the mems controller is generally the starting timing at the peak point of the sinusoidal signal, so that the actual delay time needs to be corrected to facilitate timing, specifically, the rising edge of the high level of the first pulse signal coincides with the peak point of the first sinusoidal signal. The micro electro mechanical system controller can obtain the duration of the high level in the first pulse signal according to the reference voltage, if the first pulse signal is only subjected to delay processing according to the actual delay duration, the rising edge of the high level of the first pulse signal is overlapped with the point where the reference voltage in the first sinusoidal signal is located, and the difference between the rising edge of the high level and the peak point of the first sinusoidal signal is half of the duration of the high level. If the rising edge of the high level of the first pulse signal is to be overlapped with the peak point of the first sinusoidal signal, the delay time of the first pulse signal, that is, the first delay time is equal to half of the actual delay time plus the duration of the high level.
After the first pulse signal is subjected to delay processing of the first delay duration, a fourth pulse signal is generated, and the high level of the fourth pulse signal is partially overlapped with the falling edge of the first sinusoidal signal, so that the fourth pulse signal is also subjected to delay processing. Specifically, since the high-level rising edge of the fourth pulse signal coincides with the peak point of the first sinusoidal signal, and the phase between the peak point and the first falling edge of the first sinusoidal signal after the peak point is known, the first time can be calculated and obtained, the first time is stored in the micro-electromechanical system controller, that is, the first preset time duration, the second pulse signal is obtained by performing the delay processing on the fourth pulse signal for the first preset time duration, and the high level of the second pulse signal is located at the falling edge of the first sinusoidal signal.
Due to the movement of the mirror at the falling edge and the rising edge of the first sinusoidal signal, that is, if the laser controller transmits the second pulse signal to the laser, half of the projected image is lost. In contrast, when the fourth pulse signal is subjected to delay processing for a first preset time duration, the fourth pulse signal is subjected to delay processing for a second preset time duration to obtain a third pulse signal, the high level of the third pulse signal is located on the rising edge of the first sinusoidal signal, and the second preset time duration is obtained through phase calculation between the peak point of the first sinusoidal signal and the first rising edge behind the peak point.
The MEMS controller integrates the second pulse signal and the third pulse signal to generate a line synchronization signal.
Referring to fig. 4, fig. 4 is a graph showing a variation of a first sinusoidal signal generating line synchronizing signal according to the present invention, V0 is the first sinusoidal signal, a waveform between two dotted lines in V0 is a driving period of a mirror, a waveform exhibiting a rising trend among the two dotted lines is a rising edge of the first sinusoidal signal, and a waveform exhibiting a falling trend among the two dotted lines is a falling edge of the first sinusoidal signal; v1 is a second sinusoidal signal, and the dashed line in V1 represents the reference voltage u; v2 is a first pulse signal, namely V2 is converted from V1; v3 is the fourth pulse signal, t1 is the first delay time duration; v4 is a line sync signal, and two adjacent high levels of V4, one at the rising edge of the first sinusoidal signal and the other at the falling edge of the first sinusoidal signal.
In the technical scheme provided by this embodiment, the projector determines a phase shift between a first sinusoidal signal and a second sinusoidal signal converted after filtering and amplifying the first sinusoidal signal, obtains a pulse signal converted from the second sinusoidal signal, and performs delay processing on the pulse signal according to the phase shift, so that a high level of a line synchronization signal generated after the delay processing is located at a rising edge and a falling edge of the first sinusoidal signal; because the reflector of the micro-electro-mechanical system in the projector moves on the rising edge and the falling edge of the first sinusoidal signal, the line synchronization signal and the position of the reflector are strictly synchronized, so that the laser beam can be projected to a set position on the light curtain, and the problem of image deformity caused by phase shift between the sinusoidal signals is solved.
Referring to fig. 5, fig. 5 is a second embodiment of the projector line synchronization signal according to the present invention, and based on the first embodiment, the step S310 includes:
step S311, determining a second delay time and a third delay time according to the phase shift;
step S312, respectively performing delay processing on the first pulse signal for a second delay time and a third delay time to generate a second pulse signal and a third pulse signal.
In an embodiment, after the mems controls the first pulse signal to be delayed for a first delay time, the delayed first pulse signal is respectively delayed for a first preset time and a second preset time, so as to obtain a second pulse signal and a third pulse signal.
Because the first delay time length is known, and the first preset time length and the second preset time length are known, the micro electro mechanical system can add the first delay time length and the first preset time length to obtain a second delay time length, and add the second preset time length and the first delay time length to obtain a third delay time length, so that the first pulse signal is respectively subjected to delay processing of the second delay time length and the third delay time length, and the intermediate step of converting the first pulse signal into a fourth pulse signal is omitted, so that the resource of a micro electro mechanical system controller is saved.
In the technical scheme provided by this embodiment, the mems controller directly and respectively performs delay processing on the first pulse signal for the third delay time and the second delay time, so as to omit the intermediate step of converting the first pulse signal into the fourth pulse signal, thereby saving the computing resources of the projector.
The invention also provides a projector, referring to fig. 6, fig. 6 is a working schematic diagram of the projector of the invention, and arrows in fig. 6 represent the transmission direction of signals; the projector comprises a micro electro mechanical system controller (MEMS controller), a Micro Electro Mechanical System (MEMS), a filter amplifier and a voltage comparator which are sequentially connected, wherein the voltage comparator is connected with the micro electro mechanical system controller, and an analog-to-digital converter (ADC) is arranged on a connecting circuit of the filter amplifier and the micro electro mechanical system controller.
The connecting circuit between the MEMS controller and the MEMS is provided with a micro-electro-mechanical system driver (MEMS drive), the MEMS controller is connected with a Laser controller (Laser controller), the Laser controller is connected with a Laser (Laser), and the Laser emits Laser beams (RGB Laser).
The Laser controller is connected with a data buffer module (data buffer), and the data buffer module is connected with the image input module.
Wherein, the image input: the image processing device is used for receiving image data output by a PC, a set-top box and the like and processing the image data.
Data buffering: the data buffer is used to buffer the image data.
A Laser controller: and controlling the lightening of the RGB three-color laser according to the operating position of the MEMS and input image data, and projecting an image picture by utilizing the afterglow effect of human eyes.
Laser driving: the system is used for converting digital signals into analog signals and controlling the brightness of the RGB three-color laser.
RGB laser: the laser consists of red, green and blue lasers, so that the pixel colors are synthesized.
A MEMS controller: rectangular wave and sine wave signals driven and controlled by the MEMS are output and used for controlling the operation of the MEMS, the frequency of the sine wave can be changed according to the resonance frequency of the MEMS body, and the frequency of the sawtooth wave is 60 Hz. In addition, the MEMS controller internally outputs a pulse signal through the ADC converter sampling value and the voltage comparator by using the algorithm, and generates a line synchronization signal to the laser controller.
MEMS driving: and amplifying the power of the driving signal output by the MEMS controller so as to drive the MEMS to operate.
MEMS: under the drive of a drive signal, a central reflector of an MEMS (micro electro mechanical system) can rotate around the transverse axis and the longitudinal axis to reflect a laser beam to a light curtain to scan a picture, and an image is formed by utilizing the afterglow effect of human eyes.
Filtering and amplifying: the circuit filters and amplifies the piezoelectric feedback signal of the MEMS position, so that the voltage amplitude is in a required range.
A voltage comparator: the in-phase end of the voltage comparator inputs the analog signal output after filtering and amplification, and the reverse input end inputs the reference voltage Vref. The analog signal will output pulse signal after passing through the over-voltage comparator
Vref: the reference voltage source is used as the inverted input reference voltage of the voltage comparator. Meanwhile, the voltage can be converted into a digital signal through an ADC (analog to digital converter), so that the voltage value of Vref can be obtained by the MEMS controller.
An ADC converter: the sensor is used for converting the Vref value and the filtered and amplified piezoelectric sensor feedback signal into a digital signal and transmitting the value to the MEMS controller.
Further, the projector further includes a memory and a program for generating a projector line synchronization signal, which is stored in the memory and can be executed in the mems controller, and when the program for generating a projector line synchronization signal is executed by the mems controller, the steps of the method for generating a projector line synchronization signal according to the above embodiments are implemented.
The present invention also provides a computer-readable storage medium storing a program for generating a projector line synchronization signal, which when executed by a processor implements the steps of the method for generating a projector line 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.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
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 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 (10)
1. A method for generating a projector line synchronization signal, the method comprising:
determining a phase shift between a first sinusoidal signal and a second sinusoidal signal, wherein the first sinusoidal signal is converted into the second sinusoidal signal after being filtered and amplified;
acquiring a first pulse signal, wherein the first pulse signal is obtained by converting the second sinusoidal signal;
and delaying the first pulse signal according to the phase shift to generate a line synchronization signal, wherein the high level of the line synchronization signal is positioned at the rising edge and the falling edge of the first sinusoidal signal, and a mirror of a micro electro mechanical system in the projector moves at the rising edge and the falling edge.
2. The method for generating a line synchronization signal of a projector according to claim 1, wherein the step of delaying the first pulse signal according to the phase shift to generate the line synchronization signal comprises:
performing time delay processing on the first pulse signal according to the phase shift to generate a second pulse signal and a third pulse signal, wherein the high level of the second pulse signal is located at the rising edge of the first sinusoidal signal, and the high level of the third pulse signal is located at the falling edge of the first sinusoidal signal;
and integrating the second pulse signal and the third pulse signal to generate a line synchronization signal.
3. The method for generating a projector line synchronization signal as claimed in claim 2, wherein the step of delaying the first pulse signal according to the phase shift to generate a second pulse signal and a third pulse signal comprises:
calculating a first delay time length of the first pulse signal according to the phase shift;
delaying the first pulse signal according to a first delay time length to generate a fourth pulse signal, wherein a rising edge of a high level of the fourth pulse signal is coincided with a peak point of the first sinusoidal signal;
and respectively carrying out time delay processing on the fourth pulse signal for a first preset time length and a second preset time length to generate a second pulse signal and a third pulse signal.
4. The method for generating a projector line synchronization signal as claimed in claim 3, wherein the step of calculating the first delay time duration of the first pulse signal according to the phase shift comprises:
calculating the actual time delay duration of the second sinusoidal signal relative to the first sinusoidal signal according to the phase shift;
and acquiring the duration of the high level of the first pulse signal, and adding the actual delay time to half of the duration to obtain the first delay time.
5. The method for generating a projector line synchronization signal as claimed in claim 2, wherein the step of delaying the first pulse signal according to the phase shift to generate a second pulse signal and a third pulse signal comprises:
determining a second delay time length and a third delay time length according to the phase shift;
and respectively carrying out delay processing on the first pulse signal for a second delay time and a third delay time to generate a second pulse signal and a third pulse signal.
6. The method of generating a projector line synchronization signal as claimed in claim 5, wherein the step of determining the second delay time period and the third delay time period according to the phase shift comprises:
calculating the actual time delay duration of the second sinusoidal signal relative to the first sinusoidal signal according to the phase shift;
acquiring a first preset time length, a second preset time length and a duration time length of a high level of the first pulse signal;
and determining the second delay time length according to the actual delay time length, the duration time length and the first preset time length, and determining the third delay time length according to the actual delay time length, the duration time length and the second preset time length.
7. The method for generating a projector line synchronization signal as claimed in any one of claims 1 to 6, wherein the step of determining the phase shift between the first sinusoidal signal and the second sinusoidal signal comprises:
acquiring variable phase shift generated by the change of the peak voltage of the second sinusoidal signal, and quantitative phase shift generated by converting the first sinusoidal signal into the second sinusoidal signal;
determining the phase shift from the quantitative phase shift and the variable phase shift.
8. The method for generating a projector line synchronization signal as claimed in claim 7, wherein the step of obtaining the variable phase shift generated by the variation of the peak voltage of the second sinusoidal signal comprises:
acquiring a reference voltage corresponding to the first pulse signal converted from the second sinusoidal signal, and a peak voltage of the second sinusoidal signal;
calculating the variable phase shift from the reference voltage and the peak voltage.
9. A projector, characterized in that the projector comprises a mems controller, a mems, a filter amplifier, and a voltage comparator connected in sequence, the voltage comparator is connected to the mems controller, the filter amplifier is connected to the mems controller through an analog-to-digital converter, the projector further comprises a memory, and a program for generating a projector line synchronization signal stored in the memory and operable on the mems controller, and the program for generating a projector line synchronization signal is executed by the mems controller to implement the steps of the method for generating a projector line synchronization signal according to any one of claims 1 to 8.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a program for generating a projector line synchronization signal, which when executed by a processor implements the steps of the method for generating a projector line synchronization signal according to any one of claims 1 to 8.
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| CN201378859Y (en) * | 2009-02-13 | 2010-01-06 | 深圳市纳宇电子有限公司 | Laser projection display device |
| JP5646148B2 (en) * | 2009-04-07 | 2014-12-24 | 船井電機株式会社 | projector |
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