WO2020082534A1 - 激光扫描投影设备及其投影方法 - Google Patents

激光扫描投影设备及其投影方法 Download PDF

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Publication number
WO2020082534A1
WO2020082534A1 PCT/CN2018/120483 CN2018120483W WO2020082534A1 WO 2020082534 A1 WO2020082534 A1 WO 2020082534A1 CN 2018120483 W CN2018120483 W CN 2018120483W WO 2020082534 A1 WO2020082534 A1 WO 2020082534A1
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Prior art keywords
frequency
clock signal
signal
scanning mirror
reference clock
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PCT/CN2018/120483
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French (fr)
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高文刚
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Goertek Inc
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Goertek Inc
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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
    • 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]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • H04N9/3135—Driving therefor
    • 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]
    • H04N9/3138—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using arrays of modulated light sources
    • 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]
    • H04N9/3191—Testing thereof

Definitions

  • the embodiments of the present application relate to the field of electronic technology, and in particular, to a laser scanning projection device and a projection method thereof.
  • the laser scanning projector (LBS) has a simple structure and small size. The advantages of low optical path loss, low power consumption, wide color range, large contrast, high resolution, and no need to focus.
  • the scanning mirror and the laser light source are the main components.
  • the scanning mirror rotates reciprocally with two orthogonal axes as axes, deflects the combined beam in two perpendicular directions and projects it to a predetermined area to generate a projection image.
  • the scanning mirror includes a micro-motor system (ie, MEMS), and the micro-motor system drives the scanning mirror to reciprocally rotate with two orthogonal axes as axes.
  • the operation in the first direction (commonly referred to as the lateral direction) of the scanning mirror is the line signal HS of the projected image;
  • the operation in the second direction (commonly referred to as the vertical direction) is the frame signal VS of the projected image.
  • the operating frequency in the first direction adopts the resonance frequency of MEMS.
  • the lateral resonance frequency of each MEMS is different; and the resonance frequency shift phenomenon may occur due to temperature changes and the like during long-term operation of MEMS.
  • the difference in resonance frequency or the phenomenon of resonance frequency deviation will cause abnormal distortion of the projected image.
  • the present application is proposed to provide a laser scanning projection apparatus and projection method thereof that solve the above problems or at least partially solve the above problems.
  • a projection method of a laser scanning projection device includes:
  • the scanning mirror is used to reflect the light from the laser light source to realize projection.
  • the above method further includes:
  • combining the reference clock signal to generate a lateral driving signal according to the resonance frequency includes:
  • a sine wave waveform table is searched to generate the lateral driving signal, wherein the frequency of the lateral driving signal is equal to the resonance frequency.
  • determining the first frequency division coefficient according to the resonance frequency includes:
  • the ratio of the product of the number of sampling points of the sine wave waveform table and the resonance frequency and the clock frequency of the reference clock signal is used as the first frequency division coefficient.
  • combining the reference clock signal to generate the pixel clock signal according to the resonance frequency includes:
  • the first frequency-divided clock signal is frequency-multiplied to obtain the pixel clock signal.
  • the above method further includes:
  • a longitudinal drive signal is generated according to the projected frame frequency
  • combining the reference clock signal and generating the vertical driving signal according to the projected frame frequency includes:
  • a sawtooth waveform table is searched to generate a longitudinal drive signal.
  • determining the second frequency division coefficient according to the projected frame frequency includes:
  • the ratio of the product of the projected frame frequency and the number of sampling points of the sawtooth wave waveform table and the clock frequency of the reference clock signal is used as the second frequency division coefficient.
  • obtaining the resonance frequency of the scanning mirror includes:
  • the resonance frequency of the scanning mirror is calculated.
  • a laser scanning projection device in another embodiment of the present application, includes:
  • the first signal generation module is used to generate a reference clock signal
  • a second signal generation module respectively connected to the first signal generation module, for acquiring the resonance frequency of the scanning mirror; and combining the reference clock signal to generate a pixel clock signal according to the resonance frequency;
  • a light source driving module connected to the laser light source, for driving the laser light source according to the pixel clock signal
  • the scanning mirror is used to reflect the light from the laser light source to realize projection.
  • the second signal generation module is further configured to: in combination with the reference clock signal, generate a lateral drive signal according to the resonance frequency;
  • the scanning mirror is connected to the second signal generating module and is used for lateral scanning under the driving of the lateral driving signal.
  • the second signal generation module includes:
  • a first arbitrary frequency dividing unit configured to determine a first frequency dividing coefficient according to the resonance frequency; performing frequency dividing processing on the reference clock signal according to the first frequency dividing coefficient to obtain a first frequency dividing clock signal;
  • the first signal generating unit is connected to the first arbitrary frequency dividing unit, and is used for searching a sine wave waveform table based on the first frequency dividing clock signal to generate the lateral driving signal.
  • the second signal generation module further includes:
  • a first frequency doubling unit connected to the first arbitrary frequency dividing unit, for determining a first frequency doubling factor according to the projection resolution and the number of sampling points of the sine wave waveform table; based on the first frequency doubling Multiple, frequency multiplying the first frequency-divided clock signal to obtain the pixel clock signal.
  • the second signal generation module is also used for:
  • a longitudinal drive signal is generated according to the projected frame frequency
  • the scanning mirror is also used for longitudinal scanning driven by the longitudinal driving signal.
  • the second signal generation module includes:
  • a second arbitrary frequency dividing unit configured to determine a second frequency dividing coefficient according to the projected frame frequency; performing frequency dividing processing on the reference clock signal according to the second frequency dividing coefficient to obtain a second frequency dividing clock signal;
  • the second signal generating unit is connected to the second arbitrary frequency dividing unit, and is used for searching a sawtooth wave waveform table based on the second frequency dividing clock signal to generate a longitudinal driving signal.
  • a corresponding pixel clock signal is generated according to the actual resonance frequency of the obtained scanning mirror, and the pixel clock signal is accurate and stable; and the laser light source is driven to emit light of pixel points according to the pixel clock signal . It can be seen that the embodiments of the present application can automatically adjust the pixel clock signal driving the laser light source according to the actual resonance frequency of different scanning mirrors to reduce the influence of factors such as differences in device hardware or temperature changes during operation on the image projection effect, Improve equipment performance.
  • the technical solution provided by the embodiments of the present application is to synchronize the vibration position of the scanning mirror and the lighting of the laser light source by software, which not only simplifies the hardware circuit, but also facilitates the miniaturization of the system and reduces production costs.
  • FIG. 1 is a schematic structural diagram of a laser scanning projection device provided by an embodiment of the present application.
  • FIG. 2 is a signal schematic diagram of a horizontal driving signal, a vertical driving signal, and a clock signal provided by an embodiment of this application;
  • FIG. 3 is a schematic flowchart of a projection method provided by an embodiment of the present application.
  • FIG. 4 is a circuit schematic diagram of a laser scanning projection device according to an embodiment of the application.
  • the laser scanning projection device shown in FIG. 1 includes: a laser light source 1, an optical component 2 and a scanning mirror 3.
  • the laser light source 1 is used to emit laser light.
  • the optical component 2 can be used to direct the laser beam emitted by the laser light source to the scanning mirror 3 according to the set optical path, and then deflected by the scanning mirror 3, projected to a predetermined area to generate a projection image.
  • the scanning mirror 3 reciprocally rotates with two orthogonal axes as axes, deflects the projected light beam in two perpendicular directions, and projects it to a predetermined area to generate a projection image.
  • the scanning mirror 3 includes a micro-motor system (MEMS). According to the received driving signal, the MEMS drives the scanning mirror 3 to reciprocately rotate about two orthogonal axes, that is, the operation in the first direction and the first Running in two directions.
  • MEMS micro-motor system
  • the optical component 2 may include: a focusing lens 4, a combined prism 5, a reflecting mirror 6, and the like, which are not specifically limited in this embodiment.
  • the operating frequency of the scanning mirror 3 in the first direction adopts the resonance frequency of the MEMS; the resonance frequency of different MEMS is different, affected by temperature changes, etc., making it difficult to synchronize the operating position of the scanning mirror and the laser light source. Therefore, it is necessary to monitor the resonance frequency of the scanning mirror, so as to adjust the pixel clock signal driving the laser light source according to the acquired resonance frequency, so as to keep the operating position of the scanning mirror synchronized with the lighting of the laser light source.
  • FIG. 2 shows a signal diagram of the pixel clock signal Pclk, the horizontal drive signal HS, and the vertical drive signal VS.
  • FIG. 3 shows a schematic flowchart of a projection method of a laser scanning projection device according to an embodiment of the present application. As shown in Figure 3, the method includes:
  • the scanning mirror is used to reflect the light from the laser light source to realize projection.
  • the resonance frequency of the scanning mirror can be obtained by testing before projection.
  • the scanning mirror is vibrated under the driving signals of different frequencies with the same amplitude, and the driving signal corresponding to the maximum movement amplitude of the scanning mirror
  • the frequency of is determined as the resonance frequency of the scanning mirror; or, it is detected during projection.
  • the scanning mirror can be detected in real time during the projection process In order to adjust the pixel clock signal driving the laser light source in real time according to the resonance frequency of the scanning mirror detected in real time.
  • a crystal oscillator is provided in the laser scanning projection device, and the crystal oscillator provides the reference clock signal f 1 for the laser scanning projection device.
  • the reference clock signal f 1 may be used as the above-mentioned reference clock signal f 2 ; or, the reference clock signal f 1 may be frequency-multiplied, and the frequency-multiplied clock signal may be used as the above-mentioned reference clock signal f 2 .
  • the second frequency multiplier used for frequency multiplication processing of the reference clock signal f 1 is k 2 , and the value of k 2 can be set according to actual needs, which is not specifically limited in this application. That is, the reference clock signal f 2 and the reference clock signal f 1 satisfy the following relationship:
  • the scanning mirror performs lateral operation according to its resonance frequency.
  • the frequency f pclk of the generated pixel clock signal and the resonance frequency f 0 need to satisfy the following relationship:
  • G is the horizontal resolution of the projection. That is, the frequency f pclk of the pixel clock signal is K times the resonance frequency f 0 .
  • the projection resolution includes the horizontal projection resolution and the vertical projection resolution.
  • the projected horizontal resolution is equal to the sum of the number of pixels in the effective area in the horizontal direction and the number of compensation points of the front and back edges in the horizontal direction; The sum of the compensation points of the trailing edge. It should be noted that the purpose of adding compensation points at the leading and trailing edges is to avoid distortion of the projected image edges.
  • the laser light source is driven according to the pixel clock signal, that is, the laser light source is driven by the pixel clock signal to sequentially read pixel information of the image to be projected, and according to the read pixel information
  • the laser beam is modulated, and the modulated laser beam is emitted.
  • the laser beam emitted by the laser light source will be emitted to the projection area by the scanning mirror to realize projection.
  • a corresponding pixel clock signal is generated according to the actual resonance frequency of the obtained scanning mirror, and the pixel clock signal is accurate and stable; and the laser light source is driven to emit light of pixel points according to the pixel clock signal . It can be seen that the embodiments of the present application can automatically adjust the pixel clock signal driving the laser light source according to the actual resonance frequency of different scanning mirrors to reduce the influence of factors such as differences in device hardware or temperature changes during operation on the image projection effect, Improve equipment performance.
  • the technical solution provided by the embodiment of the present application is to synchronize the vibration position of the scanning mirror and the lighting of the laser light source by software, which not only simplifies the hardware circuit, but also facilitates the miniaturization of the system and reduces the production cost.
  • the lateral driving signal for driving the scanning mirror for lateral scanning can also be generated in combination with the reference clock signal. In this way, the phase synchronization of the lateral drive signal and the pixel clock signal can be ensured.
  • the above method may further include:
  • the frequency of the generated horizontal driving signal is equal to the resonance frequency of the scanning mirror.
  • the lateral driving signal may be a sine wave signal, a square wave signal, etc., which is not specifically limited in this embodiment.
  • the above 104 "combining the reference clock signal to generate a lateral driving signal according to the resonance frequency" may be implemented by the following steps:
  • the frequency of the lateral driving signal is equal to the resonance frequency.
  • the lateral drive signal is generated by a look-up table method.
  • the frequency of the lateral drive signal to be generated can be determined in advance according to the resonance frequency of the scanning mirror.
  • the first table look-up clock signal required for table look-up can be determined, that is, the first frequency-divided clock signal Frequency of.
  • the ratio of the frequency of the reference clock signal frequency of the first frequency-divided clock signal as a first frequency dividing factor m / n, i.e. the frequency f of the first frequency-divided clock signal 3 and the reference clock signal frequency f 2 satisfies the following relationship:
  • the frequency f 3 of the first divided clock signal and the frequency f sin of the lateral drive signal satisfy the following relationship:
  • n 1 is the number of sampling points of the sine wave waveform table.
  • the ratio of the product of the number of sampling points n 1 of the sine wave waveform table and the resonance frequency f 0 to the clock frequency f 2 of the reference clock signal is taken as the first frequency division coefficient m / n.
  • the above step 1042 can be implemented by an arbitrary frequency dividing unit, that is, the reference clock signal is used as an input signal of the arbitrary frequency dividing unit, and the arbitrary frequency dividing unit divides the reference clock signal according to the first frequency dividing coefficient to obtain the first Divided clock signal.
  • the specific implementation of any frequency division unit can refer to the prior art, and will not be described in detail here.
  • the table look-up counter can be driven by the first frequency-divided clock signal to search the sine wave waveform table, and the horizontal driving signal can be output through the principle of a direct digital frequency synthesizer (Direct Digital Synthesizer, DDS).
  • the table look-up counter is specifically used to count the first frequency-divided clock outputted by any frequency division, and check the sine wave waveform table according to the count value, so as to realize the output of the horizontal drive signal.
  • the sine wave waveform table stores the sine wave waveform data.
  • combining the reference clock signal to generate a pixel clock signal according to the resonance frequency may be specifically implemented by the following steps:
  • the pixel clock frequency f pclk signal is first frequency-divided clock signal with frequency f 3 satisfies the following relationship:
  • k 1 is the first frequency multiplier.
  • the ratio of the doubled value of the projection horizontal resolution in the projection resolution to the number of sampling points of the sine wave waveform table is determined as the first multiple of frequency.
  • the scanning mirror not only performs horizontal scanning, but also performs vertical scanning.
  • the vertical driving signal for driving the scanning mirror for longitudinal scanning can also be generated according to the reference clock signal.
  • the above method may further include:
  • the frequency of the generated vertical drive signal is equal to the projected frame frequency.
  • the projected frame frequency is a fixed value, for example: 60 Hz.
  • the above 106 can be implemented by the following steps:
  • the longitudinal drive signal is generated by a look-up table method.
  • the frequency of the longitudinal drive signal to be generated can be determined in advance according to the projected frame frequency.
  • the second table look-up clock signal required for table look-up that is, the above-mentioned second frequency-divided clock signal can be determined Frequency of.
  • the ratio of the frequency of the second frequency-divided clock signal to the frequency of the reference clock signal is determined as the second frequency-division factor j / i, that is, the frequency of the second frequency-divided clock signal f 4 and the frequency f 2 of the reference clock signal satisfy the following relationship:
  • the frequency f 4 of the second divided clock signal and the frequency f saw of the longitudinal drive signal satisfy the following relationship:
  • n 2 is the number of sampling points in the sawtooth waveform table.
  • the ratio of the product of the projected frame frequency f and the number of sampling points n 2 of the sawtooth waveform table to the clock frequency f 2 of the reference clock signal is used as the second frequency division coefficient j / i.
  • the above step 1062 can be implemented by any frequency division unit, that is, the reference clock signal is used as an input signal of any frequency division unit, and the frequency division processing is performed on the reference clock signal by the arbitrary frequency division unit according to the second frequency division coefficient to obtain the second Divided clock signal.
  • any frequency division unit can refer to the prior art, and will not be described in detail here.
  • the table look-up counter can be driven by the second frequency-divided clock signal to look up the sawtooth waveform table, and the longitudinal drive signal can be output through the principle of a direct digital frequency synthesizer (Direct Digital Synthesizer, DDS).
  • the table look-up counter is specifically used to count the second frequency-divided clock output at any frequency division, and check the sawtooth waveform table according to the count value, so as to realize the output of the longitudinal drive signal.
  • the sawtooth waveform table stores the sawtooth waveform data.
  • the lateral operation signal may be generated by a sensor provided in the laser scanning projection device for monitoring the operation of the scanning mirror in the lateral direction.
  • the sensor is a piezoelectric sensor.
  • the piezoelectric sensor When the scanning mirror moves to different positions in the lateral direction, the piezoelectric sensor will generate a corresponding deformation, and then generate a corresponding voltage signal.
  • the above 1012 "determining the time difference between the lateral operation signal and the current lateral drive signal based on the current lateral drive signal of the scanning mirror" may specifically adopt the following steps achieve:
  • f () is the preset function.
  • the specific formula of f () can be derived based on the basic theory in the prior art, or it is an empirical formula, which is not specifically limited in this embodiment.
  • the technical solution provided by the embodiments of the present application can automatically adjust the pixel clock signal driving the laser light source according to the actual resonance frequency of each scanning mirror during the projection process, so as to reduce factors such as differences in the hardware of the device or temperature changes during operation.
  • the impact of image projection effects improves device performance.
  • the technical solution provided by the embodiment of the present application can be implemented through an FPGA (Field-Programmable Array) program, without adding a hardware circuit, reducing the complexity of the hardware circuit, and thereby miniaturizing the hardware circuit.
  • FPGA Field-Programmable Array
  • FIG. 4 shows a circuit schematic diagram of a laser scanning projection device provided by another embodiment of the present application.
  • the laser scanning projection device includes: a first signal generating module 20, a second signal generating module 30, a light source driving module 40, a laser light source 50 and a scanning mirror 60. among them,
  • the first signal generating module 20 is used to generate a reference clock signal
  • the second signal generation module 30 is connected to the first signal generation module 20 and used to obtain the resonance frequency of the scanning mirror; and combined with the reference clock signal to generate a pixel clock signal according to the resonance frequency;
  • the light source driving module 40 is connected to the laser light source 50, and is used to drive the laser light source according to the pixel clock signal;
  • the scanning mirror 60 is used to reflect the light from the laser light source 50 to realize projection.
  • a corresponding pixel clock signal is generated according to the actual resonance frequency of the obtained scanning mirror, and the pixel clock signal is accurate and stable; and the laser light source is driven to emit light of pixel points according to the pixel clock signal . It can be seen that the embodiments of the present application can automatically adjust the pixel clock signal driving the laser light source according to the actual resonance frequency of each scanning mirror to reduce the influence of factors such as differences in device hardware or temperature changes during operation on the image projection effect, Improve equipment performance.
  • the technical solution provided by the embodiments of the present application is to synchronize the vibration position of the scanning mirror and the lighting of the laser light source by software, which not only simplifies the hardware circuit, but also facilitates the miniaturization of the system and reduces production costs.
  • the second signal generating module 30 is further configured to: in combination with the reference clock signal, generate a lateral driving signal according to the resonance frequency;
  • the scanning mirror 60 is connected to the second signal generating module 30 and is used for lateral scanning under the driving of the lateral driving signal.
  • the second signal generating module 30 includes: a first arbitrary frequency dividing unit 301 and a first signal generating unit 302.
  • the first arbitrary frequency division unit 301 is used to determine a first frequency division coefficient according to the resonance frequency; perform frequency division processing on the reference clock signal according to the first frequency division coefficient to obtain a first frequency division clock signal ;
  • the first signal generating unit 302 is connected to the first arbitrary frequency dividing unit 301, and is used for searching a sine wave waveform table based on the first frequency dividing clock signal to generate the lateral driving signal.
  • the first signal generating unit 302 includes a first table lookup counter 3021 and a sine wave waveform table 3022.
  • the first table look-up counter 3021 counts the first frequency-divided clock signal output by the first arbitrary frequency-dividing unit 301, and searches the sine wave waveform table 3022 according to the count value, thereby realizing the output of the lateral driving signal.
  • the first arbitrary frequency dividing unit 301 is specifically configured to use the ratio of the product of the number of sampling points of the sine wave waveform table and the resonance frequency and the clock frequency of the reference clock signal as the first frequency dividing coefficient.
  • the second signal generating module 30 further includes:
  • the first frequency multiplying unit 303 is connected to the first arbitrary frequency dividing unit 301, and is used to determine a first frequency multiplying multiple according to the projection resolution and the number of sampling points of the sine wave waveform table; based on the first Frequency multiplier, frequency multiplying the first frequency-divided clock signal to obtain the pixel clock signal.
  • the second signal generation module 30 is also used to:
  • a longitudinal drive signal is generated according to the projected frame frequency
  • the scanning mirror is also used for longitudinal scanning driven by the longitudinal driving signal.
  • the second signal generation module 30 includes:
  • the second arbitrary frequency dividing unit 304 is configured to determine a second frequency dividing coefficient according to the projected frame frequency; perform frequency dividing processing on the reference clock signal according to the second frequency dividing coefficient to obtain a second frequency dividing clock signal;
  • the second signal generating unit 305 is connected to the second arbitrary frequency dividing unit, and is used to search a sawtooth wave waveform table based on the second frequency dividing clock signal to generate a longitudinal driving signal.
  • the second signal generating unit 305 includes: a second table lookup counter 3051 and a sawtooth waveform table 3052.
  • the first arbitrary frequency dividing unit 301 and the second arbitrary frequency dividing unit 304 are the same unit.
  • the second arbitrary frequency dividing unit 304 is specifically configured to: use the ratio of the product of the projected frame frequency and the number of sampling points of the sawtooth waveform table and the clock frequency of the reference clock signal as the second frequency dividing coefficient.
  • the laser scanning projection device may further include: a detection module (not shown).
  • the detection module is connected to the second signal generation module 30 and is used to collect a lateral operation signal of the scanning mirror; based on the current lateral driving signal of the scanning mirror, determine the lateral operation signal and the current lateral driving signal According to the time difference, the resonance frequency of the scanning mirror is calculated, and the resonance frequency of the scanning mirror is provided to the second signal generating module 30.
  • the above-mentioned first signal generating module 20 may include: a crystal oscillator 201 and a second frequency multiplying unit 202.
  • the laser scanning projection device provided in the above embodiments can implement the technical solutions described in the above method embodiments.
  • the specific implementation principles of the above modules or units please refer to the corresponding content in the above method embodiments. I will not repeat them here.
  • the device embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in One place, or it can be distributed to multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement without paying creative labor.
  • each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware.
  • the above technical solutions can be embodied in the form of software products in essence or part that contributes to the existing technology, and the computer software products can be stored in computer-readable storage media, such as ROM / RAM, magnetic Discs, optical discs, etc., include several instructions to enable a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in the various embodiments or some parts of the embodiments.

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Abstract

一种激光扫描投影设备及其投影方法，其中方法包括：获取扫描镜(3)的共振频率(101)；结合参考时钟信号，根据共振频率生成像素时钟信号(102)；根据像素时钟信号驱动激光光源(1)(103)；其中，扫描镜(3)用来反射来自激光光源(1)的光以实现投影。能够自动根据不同扫描镜(3)的实际共振频率来调整驱动激光光源(1)的像素时钟信号，以降低因设备硬件存在的差异性或运转时因温度变化等因素对图像投影效果的影响，提高设备性能。

Description

激光扫描投影设备及其投影方法 技术领域
本申请实施例涉及电子技术领域，尤其涉及一种激光扫描投影设备及其投影方法。
背景技术
相比常见的LCD(液晶微型投影技术)透射微投影、DLP(数字光学处理技术)反射式微投影及LCOS(硅基液晶)反射式微投影，激光扫描投影仪(LBS)具有结构简单、体积小、光路损耗小、功耗低、色彩范围广、对比度大、分辨率高、无需对焦等优点。
LBS投影系统中，扫描镜与激光光源是主要的组成部件。其中，扫描镜分别以正交的两个轴为轴线往复旋转，将合束后的光束沿垂直的两个方向偏转后投影到预定区域，生成投影图像。扫描镜包括微电机系统(即MEMS),微电机系统驱动该扫描镜以正交的两个轴为轴线往复旋转。
扫描镜的第一方向(通常称为横向)上的运转为投影图像的行信号HS；第二方向(通常称为纵向)上的运转为投影图像的帧信号VS。为降低系统的功耗，第一方向上的运转频率采用MEMS的共振频率。然而，在生产中MEMS存在一定差异性，各MEMS的横向共振频率存在差异性；且MEMS长时间运转会因为温度变化等出现共振频率偏移现象。共振频率存在的差异或共振频率偏移的现象，会致使投影图像畸变异常。
发明内容
鉴于上述问题，提出了本申请以提供一种解决上述问题或至少部分地 解决上述问题的一种激光扫描投影设备及其投影方法。
在本申请的一个实施例中，提供了一种激光扫描投影设备的投影方法。该方法，包括：
获取扫描镜的共振频率；
结合参考时钟信号，根据所述共振频率生成像素时钟信号；
根据所述像素时钟信号驱动所述激光光源；
其中，所述扫描镜用来反射来自所述激光光源的光以实现投影。
可选地，上述方法，还包括：
结合所述参考时钟信号，根据所述共振频率生成横向驱动信号；
根据所述横向驱动信号驱动所述扫描镜作横向扫描。
可选地，结合所述参考时钟信号，根据所述共振频率生成横向驱动信号，包括：
根据所述共振频率，确定第一分频系数；
按照所述第一分频系数，对所述参考时钟信号进行分频处理，得到第一分频时钟信号；
基于所述第一分频时钟信号，查找正弦波波形表，以生成所述横向驱动信号，其中，所述横向驱动信号的频率等于所述共振频率。
可选地，根据所述共振频率，确定第一分频系数，包括：
将所述正弦波波形表的采样点个数和所述共振频率的乘积与所述参考时钟信号的时钟频率的比值作为第一分频系数。
可选地，结合参考时钟信号，根据所述共振频率生成像素时钟信号，包括：
根据投影分辨率以及所述正弦波波形表的采样点个数，确定第一倍频倍数；
基于所述第一倍频倍数，对所述第一分频时钟信号进行倍频处理，得到所述像素时钟信号。
可选地，上述方法，还包括：
结合所述参考时钟信号，根据投影帧频率生成纵向驱动信号；
根据所述纵向驱动信号驱动所述扫描镜作纵向扫描。
可选地，结合所述参考时钟信号，根据投影帧频率生成纵向驱动信号，包括：
根据投影帧频率，确定第二分频系数；
按照所述第二分频系数，对所述参考时钟信号进行分频处理，得到第二分频时钟信号；
基于所述第二分频时钟信号，查找锯齿波波形表，以生成纵向驱动信号。
可选地，根据投影帧频率，确定第二分频系数，包括：
将投影帧频率和所述锯齿波波形表的采样点个数的乘积与所述参考时钟信号的时钟频率的比值作为第二分频系数。
可选地，获取扫描镜的共振频率，包括：
采集扫描镜的横向运转信号；
基于所述扫描镜的当前横向驱动信号，确定所述横向运转信号与所述当前横向驱动信号的时间差；
根据所述时间差，计算得到所述扫描镜的共振频率。
在本申请的另一个实施例中，提供了一种激光扫描投影设备。该激光扫描投影设备，包括：
第一信号发生模块，用于产生参考时钟信号；
第二信号发生模块，分别与所述第一信号发生模块连接，用于获取扫描镜的共振频率；并结合所述参考时钟信号，根据所述共振频率生成像素时钟信号；
光源驱动模块，与激光光源连接，用于根据所述像素时钟信号驱动所述激光光源；
其中，所述扫描镜用来反射来自所述激光光源的光以实现投影。
可选地，第二信号发生模块，还用于：结合所述参考时钟信号，根据所述共振频率生成横向驱动信号；
所述扫描镜，与所述第二信号发生模块连接，用于在所述横向驱动信号的驱动下作横向扫描。
可选地，所述第二信号发生模块，包括：
第一任意分频单元，用于根据所述共振频率，确定第一分频系数；按照所述第一分频系数，对所述参考时钟信号进行分频处理，得到第一分频时钟信号；
第一信号发生单元，与所述第一任意分频单元连接，用于基于所述第一分频时钟信号，查找正弦波波形表，以生成所述横向驱动信号。
可选地，所述第二信号发生模块，还包括：
第一倍频单元，与所述第一任意分频单元连接，用于根据投影分辨率以及所述正弦波波形表的采样点个数，确定第一倍频倍数；基于所述第一倍频倍数，对所述第一分频时钟信号进行倍频处理，得到所述像素时钟信号。
可选地，第二信号发生模块，还用于：
结合所述参考时钟信号，根据投影帧频率生成纵向驱动信号；
所述扫描镜，还用于在所述纵向驱动信号的驱动下作纵向扫描。
可选地，第二信号发生模块，包括：
第二任意分频单元，用于根据投影帧频率，确定第二分频系数；按照所述第二分频系数，对所述参考时钟信号进行分频处理，得到第二分频时钟信号；
第二信号发生单元，与所述第二任意分频单元连接，用于基于所述第二分频时钟信号，查找锯齿波波形表，以生成纵向驱动信号。
本申请实施例提供的技术方案，根据获取到的扫描镜的实际共振频率来生成相应的像素时钟信号，该像素时钟信号精确，稳定；并根据该像素 时钟信号来驱动激光光源发出像素点的光。可见，本申请实施例能够自动根据不同扫描镜的实际共振频率来调整驱动激光光源的像素时钟信号，以降低因设备硬件存在的差异性或运转时因温度变化等因素对图像投影效果的影响，提高设备性能。另外，采用本申请实施例提供的技术方案，是通过软件方式实现的扫描镜的振动位置与激光光源点亮的同步，不仅精简了硬件电路，还有利于系统的微型化，降低生产成本。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请一实施例提供的激光扫描投影设备的原理性结构图；
图2为本申请一实施例提供的横向驱动信号、纵向驱动信号与时钟信号的信号示意图；
图3为本申请一实施例提供的投影方法的流程示意图；
图4为本申请一实施例提供的激光扫描投影设备的电路原理图。
具体实施方式
为了使本技术领域的人员更好地理解本申请方案，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。
在本申请的说明书和权利要求书及上述附图中的描述的一些流程中，包含了按照特定顺序出现的多个操作，但是应该清楚了解，这些操作可以不按照其在本文中出现的顺序来执行或并行执行，操作的序号如101、102等，仅仅是用于区分开各个不同的操作，序号本身不代表任何的执行顺序。另外，这些流程可以包括更多或更少的操作，并且这些操作可以按顺序执行或并行执行。需要说明的是，本文中的“第一”、“第二”等描述，是用于区分不同的 消息、设备、模块等，不代表先后顺序，也不限定“第一”和“第二”是不同的类型。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
在介绍本申请实施例提供的技术方案之前，先对激光扫描投影设备的结构作一个简单介绍。
如图1所示的激光扫描投影设备，包括：激光光源1、光学组件2和扫描镜3。其中，激光光源1用于发射激光。具体实施时，激光光源1可为三个，分别为红绿蓝三色激光光源，用于提供红绿蓝三种衍射的激光束以投影生成彩色图像。光学组件2可用于将激光光源发出的激光光束按照设定光路至扫描镜3，再经扫描镜3偏转后，投影到预定区域生成投影图像。扫描镜3分别以正交的两个轴为轴线往复旋转，将投射来的光束沿垂直的两个方向偏转后投影到预定区域，生成投影图像。扫描镜3包括微电机系统(MEMS)，MEMS根据接收到的驱动信号，驱动扫描镜3以正交的两个轴为轴线往复旋转，即上述内容中提及的第一方向上的运转及第二方向上的运转。
这里需要说明的是：光学组件2可包括：聚焦透镜4、组合型棱镜5、反射镜6等等，本实施例对此不作具体限定。
由于扫描镜3在第一方向上的运转频率采用的是MEMS的共振频率；不同MEMS的共振频率存在差异、受温度变化影响等等，使得扫描镜运转位置与激光光源点亮难以同步。因此，需要对扫描镜的共振频率进行监控，以便根据获取到的共振频率调整驱动激光光源的像素时钟信号，以使扫描镜的运转位置与激光光源点亮保持同步。
图2示出了像素时钟信号Pclk、横向驱动信号HS以及纵向驱动信号 VS的信号图。
图3示出了本申请一实施例提供的激光扫描投影设备的投影方法的流程示意图。如图3所示，该方法包括：
101、获取扫描镜的共振频率。
102、结合参考时钟信号，根据所述共振频率生成像素时钟信号。
103、根据所述像素时钟信号驱动所述激光光源。
其中，所述扫描镜用来反射来自所述激光光源的光以实现投影。
上述101中，扫描镜的共振频率可以是在投影前测试得到，例如：让扫描镜分别在具有相同振幅的不同频率的驱动信号的驱动下振动，将扫描镜的最大运动幅度所对应的驱动信号的频率确定为扫描镜的共振频率；或者，在投影过程中检测得到。
由于扫描镜在运转过程中会因为温度变化等出现共振频率偏移现象，为了在整个投影过程中确保扫描镜的扫描位置和激光光源点亮的同步性，可在投影过程中实时去检测扫描镜的共振频率，以便根据实时检测到的扫描镜的共振频率来实时调整驱动激光光源的像素时钟信号。
在投影过程中检测共振频率的具体实现将在下述实施例中详细介绍。
上述102中，激光扫描投影设备中设置有晶体振荡器，由晶体振荡器为激光扫描投影设备提供基准时钟信号f 1。可将基准时钟信号f 1作为上述参考时钟信号f 2；或者，对基准时钟信号f 1进行倍频处理，将倍频处理后的时钟信号作为上述参考时钟信号f 2。对基准时钟信号f 1进行倍频处理所使用的第二倍频倍数为k 2，k 2的值可根据实际需要进行设置，本申请对此不作具体限定。即参考时钟信号f 2与基准时钟信号f 1满足以下关系：
f 2＝k 2×f 1    (1)
需要说明的是，将倍频处理后的时钟信号，即较高频率的时钟信号作为上述参考时钟信号，可有效提高基于参考时钟信号生成的像素时钟信号的精度。
扫描镜按照其共振频率做横向运转，为了实现扫描镜的扫描位置与激光光源点亮的同步性，所生成的像素时钟信号的频率f pclk与共振频率f 0需满足以下关系：
f pclk＝K×f 0    (2)
K＝2G    (3)
其中，G为投影水平分辨率。即像素时钟信号的频率f pclk是共振频率f 0的K倍。
通常，投影分辨率包括投影水平分辨率和投影垂直分辨率。投影水平分辨率等于水平方向上的有效区域的像素点数与水平方向上的前沿和后沿的补偿点数的和值；投影垂直分辨率等于垂直方向上的有效区域的像素点数与垂直方向上的前沿和后沿的补偿点数的和值。需要说明的是，在前沿和后沿添加补偿点数的目的是为了避免投影图像边缘的畸变。
上述103中，根据所述像素时钟信号驱动所述激光光源，也即是：激光光源在像素时钟信号的驱动下，依次读取待投影图像的像素点信息，并根据读取到的像素点信息调制激光束，并发射出调制后的激光束。激光光源发射出的激光束会被扫描镜发射至投影区域以实现投影。
本申请实施例提供的技术方案，根据获取到的扫描镜的实际共振频率来生成相应的像素时钟信号，该像素时钟信号精确，稳定；并根据该像素时钟信号来驱动激光光源发出像素点的光。可见，本申请实施例能够自动根据不同扫描镜的实际共振频率来调整驱动激光光源的像素时钟信号，以降低因设备硬件存在的差异性或运转时因温度变化等因素对图像投影效果的影响，提高设备性能。另外，采用本申请实施例提供的技术方案，是通过软件方式实现的扫描镜的振动位置与激光光源点亮的同步，不仅精简了硬件电路，还有利于系统的微型化，降低生产成本。
实际应用时，驱动扫描镜作横向扫描的横向驱动信号也可结合上述参考时钟信号生成。这样，可确保横向驱动信号和像素时钟信号的相位同步。具 体地，上述方法，还可包括：
104、结合所述参考时钟信号，根据所述共振频率生成横向驱动信号。
105、根据所述横向驱动信号驱动所述扫描镜作横向扫描。
上述104中，所产生的横向驱动信号的频率等于扫描镜的共振频率。横向驱动信号可以是正弦波信号、也可以是方波信号等等，本实施例对此不作具体限定。
在一种可实现的方案中，上述104中“结合所述参考时钟信号，根据所述共振频率生成横向驱动信号”，具体可采用如下步骤来实现：
1041、根据所述共振频率，确定第一分频系数。
1042、按照所述第一分频系数，对所述参考时钟信号进行分频处理，得到第一分频时钟信号。
1043、基于所述第一分频时钟信号，查找正弦波波形表，以生成所述横向驱动信号。
其中，所述横向驱动信号的频率等于所述共振频率。
本实施例中，通过查表法来产生横向驱动信号。根据扫描镜的共振频率可事先确定欲产生的横向驱动信号的频率。根据欲产生的横向驱动信号的频率(即共振频率f 0)以及正弦波波形表的采样点个数，可确定出查表所需的第一查表时钟信号，即上述第一分频时钟信号的频率。将第一分频时钟信号的频率与参考时钟信号的频率的比值确定为第一分频系数m/n，也即第一分频时钟信号的频率f 3与参考时钟信号的频率f 2满足如下关系：
f 3＝f 2×m/n    (4)
第一分频时钟信号的频率f 3与横向驱动信号的频率f sin满足如下关系：
f 0＝f sin＝f 3/n 1    (5)
其中，n 1为正弦波波形表的采样点个数。
通过上述公式(4)和(5)，可以得到：
Figure PCTCN2018120483-appb-000001
即，将所述正弦波波形表的采样点个数n 1和所述共振频率f 0的乘积与所述参考时钟信号的时钟频率f 2的比值作为第一分频系数m/n。
上述1042的步骤可任意分频单元来实现，即将参考时钟信号作为任意分频单元的输入信号，由任意分频单元按照第一分频系数，对参考时钟信号进行分频处理，以得到第一分频时钟信号。任意分频单元的具体实现可参见现有技术，在此不再详述。
上述1043中，可由第一分频时钟信号来驱动查表计数器查找正弦波波形表，并通过直接数字式频率合成器(Direct Digital Synthesizer，DDS)原理输出横向驱动信号。查表计数器具体用于：对任意分频输出的第一分频时钟进行计数，根据计数值查正弦波波形表，从而实现横向驱动信号的输出。其中，正弦波波形表内存储着正弦波的波形数据。
进一步的，上述102中“结合参考时钟信号，根据所述共振频率生成像素时钟信号”，具体可采用如下步骤来实现：
1021、根据投影分辨率以及所述正弦波波形表的采样点个数，确定第一倍频倍数。
1022、基于所述第一倍频倍数，对所述第一分频时钟信号进行倍频处理，得到所述像素时钟信号。
即：像素时钟信号的频率f pclk与第一分频时钟信号的频率f 3满足如下关系：
f pclk＝k 1×f 3    (7)
其在，k 1为第一倍频倍数。
由公式(2)、(3)、(5)和(7)，可以得到：
k 1＝2G/n 1
即：将投影分辨率中投影水平分辨率的两倍值与正弦波波形表的采样点个数的比值确定为第一倍频倍数。
激光扫描投影设备在投影时，扫描镜不仅作横向扫描，还作纵向扫描。 驱动扫描镜作纵向扫描的纵向驱动信号也可根据参考时钟信号来生成。具体地，上述方法，还可包括：
106、结合所述参考时钟信号，根据投影帧频率生成纵向驱动信号。
107、根据所述纵向驱动信号驱动所述扫描镜作纵向扫描。
上述106中，所产生的纵向驱动信号的频率等于投影帧频率。通常，投影帧频率为一固定值，例如：60Hz。
在一种可实现的方案中，上述106，可采用如下步骤来实现：
1061、根据投影帧频率，确定第二分频系数。
1062、按照所述第二分频系数，对所述参考时钟信号进行分频处理，得到第二分频时钟信号。
1063、基于所述第二分频时钟信号，查找锯齿波波形表，以生成纵向驱动信号。
本实施例中，通过查表法来产生纵向驱动信号。根据投影帧频率可事先确定欲产生的纵向驱动信号的频率。根据欲产生的纵向驱动信号的频率(即投影帧频率f)以及锯齿波波形表的采样点个数，可确定出查表所需的第二查表时钟信号，即上述第二分频时钟信号的频率。将第二分频时钟信号的频率与参考时钟信号的频率的比值确定为第二分频系数j/i，也即第二分频时钟信号f 4与参考时钟信号的频率f 2满足如下关系：
f 4＝f 2×j/i    (8)
第二分频时钟信号的频率f 4与纵向驱动信号的频率f saw满足如下关系：
f＝f saw＝f 4/n 2    (9)
其中，n 2为锯齿波波形表的采样点个数。
通过上述公式(8)和(9)，可以得到：
Figure PCTCN2018120483-appb-000002
即，将投影帧频率f和所述锯齿波波形表的采样点个数n 2的乘积与所述参考时钟信号的时钟频率f 2的比值作为第二分频系数j/i。
上述1062的步骤可任意分频单元来实现，即将参考时钟信号作为任意分频单元的输入信号，由任意分频单元按照第二分频系数，对参考时钟信号进行分频处理，以得到第二分频时钟信号。任意分频单元的具体实现可参见现有技术，在此不再详述。
上述1063中，可由第二分频时钟信号来驱动查表计数器查找锯齿波波形表，并通过直接数字式频率合成器(Direct Digital Synthesizer，DDS)原理输出纵向驱动信号。查表计数器具体用于：对任意分频输出的第二分频时钟进行计数，根据计数值查锯齿波波形表，从而实现纵向驱动信号的输出。其中，锯齿波波形表内存储着锯齿波的波形数据。
下面将介绍在投影过程中，对扫描镜的共振频率的检测过程。即上述101中“获取扫描镜的共振频率”，具体可采用如下步骤来实现：
1011、采集扫描镜的横向运转信号。
1012、基于所述扫描镜的当前横向驱动信号，确定所述横向运转信号与所述当前横向驱动信号的时间差。
1013、根据所述时间差，计算得到所述扫描镜的共振频率。
上述1011中，横向运转信号可以是设置在激光扫描投影设备中用于监测扫描镜在横向方向上运转情况的传感器生成的。例如，该传感器为压电传感器，扫描镜在横向运转到不同位置，压电传感器会产生相应的形变，进而生成相应的电压信号。
当所述横向运转信号为传感器采集到的电压信号时，上述1012“基于所述扫描镜的当前横向驱动信号，确定所述横向运转信号与所述当前横向驱动信号的时间差”可具体采用如下步骤实现：
S11、将所述电压信号与预置电压信号进行比较。
S12、根据比较结果，生成第一脉冲信号。
S13、获取与所述当前横向驱动信号相位同步的第二脉冲信号。
S14、根据所述第一脉冲信号及所述第二脉冲信号，确定所述时间差。
上述1013可采用如下步骤来实现：
S21、获取硬件电路固有的相移等效时间。
S22、计算所述时间差与所述相移等效时间的差值。
S23、根据所述差值及当前驱动信号的频率，计算得到所述扫描镜的共振频率。
即上述实现过程可简单理解为采用如下计算公式实现：
Figure PCTCN2018120483-appb-000003
其中，t为上述时间差；Δt为硬件电路固有的相移等效时间；m为正弦波波形表的采样点个数；F n为所述扫描镜的共振频率，F n-1为当前横向驱动信号的频率。f()为预置函数。具体实施时，f()的具体公式实现可基于现有技术中的基础理论推导得到，或者为一个经验公式，本实施例对此不作具体限定。
本申请实施例提供的技术方案能够在投影过程中自动根据各扫描镜的实际共振频率来调整驱动激光光源的像素时钟信号，以降低因设备硬件存在的差异性或运转时因温度变化等因素对图像投影效果的影响，提高设备性能。另外，采用本申请实施例提供的技术方案，可通过FPGA(Field－Programmable Gate Array)程序即可实现，无需增加硬件电路，减少硬件电路复杂度，从而实现硬件电路的微型化。
图4示出了本申请又一实施例提供的激光扫描投影设备的电路原理图。如图4所示，所述激光扫描投影设备，包括：第一信号发生模块20、第二信号发生模块30、光源驱动模块40、激光光源50和扫描镜60。其中，
第一信号发生模块20，用于产生参考时钟信号；
第二信号发生模块30，与所述第一信号发生模块20连接，用于获取扫 描镜的共振频率；并结合所述参考时钟信号，根据所述共振频率生成像素时钟信号；
光源驱动模块40，与激光光源50连接，用于根据所述像素时钟信号驱动所述激光光源；
其中，所述扫描镜60用来反射来自所述激光光源50的光以实现投影。
本申请实施例提供的技术方案，根据获取到的扫描镜的实际共振频率来生成相应的像素时钟信号，该像素时钟信号精确，稳定；并根据该像素时钟信号来驱动激光光源发出像素点的光。可见，本申请实施例能够自动根据各扫描镜的实际共振频率来调整驱动激光光源的像素时钟信号，以降低因设备硬件存在的差异性或运转时因温度变化等因素对图像投影效果的影响，提高设备性能。另外，采用本申请实施例提供的技术方案，是通过软件方式实现的扫描镜的振动位置与激光光源点亮的同步，不仅精简了硬件电路，还有利于系统的微型化，降低生产成本。
进一步的，第二信号发生模块30，还用于：结合所述参考时钟信号，根据所述共振频率生成横向驱动信号；
所述扫描镜60，与所述第二信号发生模块30连接，用于在所述横向驱动信号的驱动下作横向扫描。
具体实施时，所述第二信号发生模块30，包括：第一任意分频单元301和第一信号发生单元302。
第一任意分频单元301，用于根据所述共振频率，确定第一分频系数；按照所述第一分频系数，对所述参考时钟信号进行分频处理，得到第一分频时钟信号；
第一信号发生单元302，与所述第一任意分频单元301连接，用于基于所述第一分频时钟信号，查找正弦波波形表，以生成所述横向驱动信号。
其中，第一信号发生单元302包括第一查表计数器3021以及正弦波波形表3022。第一查表计数器3021通过对第一任意分频单元301输出的第一分 频时钟信号进行计数，根据计数值查找正弦波波形表3022，从而实现横向驱动信号的输出。
第一任意分频单元301，具体用于：将所述正弦波波形表的采样点个数和所述共振频率的乘积与所述参考时钟信号的时钟频率的比值作为第一分频系数。
进一步的，所述第二信号发生模块30，还包括：
第一倍频单元303，与所述第一任意分频单元301连接，用于根据投影分辨率以及所述正弦波波形表的采样点个数，确定第一倍频倍数；基于所述第一倍频倍数，对所述第一分频时钟信号进行倍频处理，得到所述像素时钟信号。
进一步的，第二信号发生模块30，还用于：
结合所述参考时钟信号，根据投影帧频率生成纵向驱动信号；
所述扫描镜，还用于在所述纵向驱动信号的驱动下作纵向扫描。
具体地，第二信号发生模块30，包括：
第二任意分频单元304，用于根据投影帧频率，确定第二分频系数；按照所述第二分频系数，对所述参考时钟信号进行分频处理，得到第二分频时钟信号；
第二信号发生单元305，与所述第二任意分频单元连接，用于基于所述第二分频时钟信号，查找锯齿波波形表，以生成纵向驱动信号。
其中，第二信号发生单元305包括：第二查表计数器3051和锯齿波波形表3052。
需要补充说明的是，为了简化电路以及确保横向驱动信号、纵向驱动信号以及像素时钟信号的相位同步，上述第一任意分频单元301和第二任意分频单元304为同一单元。
第二任意分频单元304，具体用于：将投影帧频率和所述锯齿波波形表的采样点个数的乘积与所述参考时钟信号的时钟频率的比值作为第二分频系 数。
进一步的，所述激光扫描投影设备，还可包括：检测模块(未图示)。所述检测模块，与所述第二信号发生模块30连接，用于采集扫描镜的横向运转信号；基于所述扫描镜的当前横向驱动信号，确定所述横向运转信号与所述当前横向驱动信号的时间差；根据所述时间差，计算得到所述扫描镜的共振频率，并将所述扫描镜的共振频率提供给所述第二信号发生模块30。
进一步的，上述第一信号发生模块20可包括：晶体振荡器201和第二倍频单元202。
这里需要说明的是：上述实施例提供的激光扫描投影设备可实现上述各方法实施例中描述的技术方案，上述各模块或单元具体实现的原理可参见上述各方法实施例中的相应内容，此处不再赘述。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
以上所描述的装置实施例仅仅是示意性的，其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在不付出创造性的劳动的情况下，即可以理解并实施。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到各实施方式可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件。基于这样的理解，上述技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品可以存储在计算机可读存储介质中，如ROM/RAM、磁碟、光盘等，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行各个实施 例或者实施例的某些部分所述的方法。
最后应说明的是：以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (15)

  1. 一种激光扫描投影设备的投影方法，其特征在于，包括：
    获取扫描镜的共振频率；
    结合参考时钟信号，根据所述共振频率生成像素时钟信号；
    根据所述像素时钟信号驱动所述激光光源；
    其中，所述扫描镜用来反射来自所述激光光源的光以实现投影。
  2. 根据权利要求1所述的方法，其特征在于，还包括：
    结合所述参考时钟信号，根据所述共振频率生成横向驱动信号；
    根据所述横向驱动信号驱动所述扫描镜作横向扫描。
  3. 根据权利要求2所述的方法，其特征在于，结合所述参考时钟信号，根据所述共振频率生成横向驱动信号，包括：
    根据所述共振频率，确定第一分频系数；
    按照所述第一分频系数，对所述参考时钟信号进行分频处理，得到第一分频时钟信号；
    基于所述第一分频时钟信号，查找正弦波波形表，以生成所述横向驱动信号，其中，所述横向驱动信号的频率等于所述共振频率。
  4. 根据权利要求3所述的方法，其特征在于，根据所述共振频率，确定第一分频系数，包括：
    将所述正弦波波形表的采样点个数和所述共振频率的乘积与所述参考时钟信号的时钟频率的比值作为第一分频系数。
  5. 根据权利要求3或4所述的方法，其特征在于，结合参考时钟信号，根据所述共振频率生成像素时钟信号，包括：
    根据投影分辨率以及所述正弦波波形表的采样点个数，确定第一倍频倍数；
    基于所述第一倍频倍数，对所述第一分频时钟信号进行倍频处理，得到 所述像素时钟信号。
  6. 根据权利要求1至4中任一项所述的方法，其特征在于，还包括：
    结合所述参考时钟信号，根据投影帧频率生成纵向驱动信号；
    根据所述纵向驱动信号驱动所述扫描镜作纵向扫描。
  7. 根据权利要求6所述的方法，其特征在于，结合所述参考时钟信号，根据投影帧频率生成纵向驱动信号，包括：
    根据投影帧频率，确定第二分频系数；
    按照所述第二分频系数，对所述参考时钟信号进行分频处理，得到第二分频时钟信号；
    基于所述第二分频时钟信号，查找锯齿波波形表，以生成纵向驱动信号。
  8. 根据权利要求7所述的方法，其特征在于，根据投影帧频率，确定第二分频系数，包括：
    将投影帧频率和所述锯齿波波形表的采样点个数的乘积与所述参考时钟信号的时钟频率的比值作为第二分频系数。
  9. 根据权利要求1至4中任一项所述的方法，其特征在于，获取扫描镜的共振频率，包括：
    采集扫描镜的横向运转信号；
    基于所述扫描镜的当前横向驱动信号，确定所述横向运转信号与所述当前横向驱动信号的时间差；
    根据所述时间差，计算得到所述扫描镜的共振频率。
  10. 一种激光扫描投影设备，其特征在于，包括：
    第一信号发生模块，用于产生参考时钟信号；
    第二信号发生模块，与所述第一信号发生模块连接，用于获取扫描镜的共振频率；并结合所述参考时钟信号，根据所述共振频率生成像素时钟信号；
    光源驱动模块，与激光光源连接，用于根据所述像素时钟信号驱动所述 激光光源；
    其中，所述扫描镜用来反射来自所述激光光源的光以实现投影。
  11. 根据权利要求10所述的设备，其特征在于，第二信号发生模块，还用于：结合所述参考时钟信号，根据所述共振频率生成横向驱动信号；
    所述扫描镜，与所述第二信号发生模块连接，用于在所述横向驱动信号的驱动下作横向扫描。
  12. 根据权利要求11所述的设备，其特征在于，所述第二信号发生模块，包括：
    第一任意分频单元，用于根据所述共振频率，确定第一分频系数；按照所述第一分频系数，对所述参考时钟信号进行分频处理，得到第一分频时钟信号；
    第一信号发生单元，与所述第一任意分频单元连接，用于基于所述第一分频时钟信号，查找正弦波波形表，以生成所述横向驱动信号。
  13. 根据权利要求12所述的设备，其特征在于，所述第二信号发生模块，还包括：
    第一倍频单元，与所述第一任意分频单元连接，用于根据投影分辨率以及所述正弦波波形表的采样点个数，确定第一倍频倍数；基于所述第一倍频倍数，对所述第一分频时钟信号进行倍频处理，得到所述像素时钟信号。
  14. 根据权利要求10至13中任一项所述的设备，其特征在于，第二信号发生模块，还用于：
    结合所述参考时钟信号，根据投影帧频率生成纵向驱动信号；
    所述扫描镜，还用于在所述纵向驱动信号的驱动下作纵向扫描。
  15. 根据权利要求14所述的设备，其特征在于，第二信号发生模块，包括：
    第二任意分频单元，用于根据投影帧频率，确定第二分频系数；按照所述第二分频系数，对所述参考时钟信号进行分频处理，得到第二分频时钟信 号；
    第二信号发生单元，与所述第二任意分频单元连接，用于基于所述第二分频时钟信号，查找锯齿波波形表，以生成纵向驱动信号。
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