WO2018233115A1 - 色轮相位检测方法、系统以及投影设备 - Google Patents

色轮相位检测方法、系统以及投影设备 Download PDF

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Publication number
WO2018233115A1
WO2018233115A1 PCT/CN2017/103438 CN2017103438W WO2018233115A1 WO 2018233115 A1 WO2018233115 A1 WO 2018233115A1 CN 2017103438 W CN2017103438 W CN 2017103438W WO 2018233115 A1 WO2018233115 A1 WO 2018233115A1
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Prior art keywords
phase
color wheel
electric power
detecting
preset
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Ceased
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PCT/CN2017/103438
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English (en)
French (fr)
Inventor
张正德
吕强
潘乐
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Priority to US16/622,512 priority Critical patent/US11781915B2/en
Publication of WO2018233115A1 publication Critical patent/WO2018233115A1/zh
Anticipated expiration legal-status Critical
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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
    • G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/206—Control of light source other than position or intensity
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B33/00—Colour photography, other than mere exposure or projection of a colour film
    • G03B33/08—Sequential recording or projection
    • 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]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
    • H04N9/3114—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources by using a sequential colour filter producing one colour at a time
    • 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
    • H04N9/3194—Testing thereof including sensor feedback

Definitions

  • the present invention relates to the field of optics, and in particular to a color wheel phase detecting method, system and projection apparatus.
  • a single-chip DLP projector emits different kinds of laser light by an excitation light, and outputs images of different colors through the DMD to be restored to a real image.
  • the color wheel is a vital component that affects the performance of the projection device.
  • the color wheel is usually synchronized by attaching a black tape to the color wheel motor and detecting the position of the black tape on the rotating color wheel by the photoelectric detecting device. , thereby detecting the rotation speed and phase of the color wheel.
  • the technical problem to be solved by the present invention is to provide a color wheel phase detecting method, system and projection device, which are not only simple and effective but also low in cost and have a good user experience.
  • a technical solution adopted by the present invention is to provide a color wheel phase detecting system, comprising a color wheel, a color wheel motor for driving the color wheel to rotate, and a control circuit, wherein the color wheel motor is a three-phase motor.
  • the control circuit includes a three-phase driving circuit for controlling operation of the color wheel motor, the color wheel phase detecting system further comprising phase detecting means for detecting the three-phase driving circuit, the phase detecting device is detecting A pulse signal is sent to the control circuit to achieve detection of a color wheel phase when the preset phase is reached.
  • the preset phase corresponds to a preset starting position of the color wheel.
  • the phase detecting device comprises an acquiring module for collecting the phase of the three-phase driving circuit and a control module connected to the collecting module for controlling the collecting module, receiving and recording the collecting result of the collecting module.
  • the acquisition module is an ADC acquisition module.
  • control module is an MCU module.
  • the three-phase driving circuit comprises A-phase power, B-phase power and C-phase power
  • the ADC acquisition module simultaneously detects voltages of the A-phase power, the B-phase power, and the C-phase power.
  • the preset phase is that the voltage of the A phase is 0V, the voltage of the B phase is 0V, and the phase C is high.
  • control circuit further comprises an image processing circuit for receiving the signal transmitted by the phase detecting means and controlling the three-phase driving circuit according to the implemented signal.
  • another technical solution adopted by the present invention is to provide a projection apparatus including the color wheel phase detecting system as described above.
  • phase detection method for a color wheel phase detecting system as described above, wherein the color wheel has a preset starting position, a color wheel
  • the phase detection method includes the following steps:
  • the phase of the three-phase drive circuit at each time is detected by the phase detecting means. And determining whether the phase is a preset phase, where the preset phase corresponds to a preset starting position of the color wheel;
  • phase detecting device detects that the phase of the three-phase driving circuit is the preset phase, a pulse signal is transmitted, and the preset phase corresponds to a preset starting position of the color wheel.
  • the method for detecting the phase of the three-phase driving circuit by the phase detecting device comprises the following steps:
  • the voltage cycle of the three-phase electric power is in different cycles, and the phase of the three-phase electric current at the current time is judged according to the voltages MA, MB, and MC of the A-phase electric power, the B-phase electric power, and the C-phase electric power.
  • the starting position of the color wheel is a corresponding color wheel position when the voltage of the A phase is 0V, the voltage of the B phase is 0V, and the phase C is high.
  • the invention has the beneficial effects that the color wheel phase detecting system is driven by the three-phase motor to drive the color wheel to rotate, and the phase detecting device detects the phase of the three-phase driving circuit to detect the color wheel.
  • the phase can avoid the unsynchronized projection images generated by the tape on the color wheel, the phenomenon of the flower screen, the reliability, the high precision and the low cost, and the better user experience.
  • FIG. 1 is a schematic structural view of a color wheel phase detecting system of the present invention
  • FIG. 2 is a schematic diagram of voltages of a three-phase driving circuit corresponding to three-phase electric power
  • FIG. 3 is a schematic structural view of a phase detecting device of a color wheel phase detecting system of the present invention.
  • FIG. 4 is a flow chart showing the detection of the color wheel phase detecting system of the present invention.
  • the color wheel phase detecting system of the present invention comprises a color wheel 1, a color wheel motor 2 for driving the color wheel 1 to rotate, a control circuit 3, and a phase detecting device 4.
  • the color wheel motor 2 is a three-phase motor.
  • the control circuit 3 includes a three-phase drive circuit 31 for driving the operation of the color wheel motor 2 and an image processing circuit 32.
  • the three-phase driving circuit 31 generates A-phase power, B-phase power, and C-phase power to respectively input the input ends of the color wheel motor 2 and the phase detecting device 4 for driving the color wheel motor 2 to operate, thereby driving the color wheel to rotate.
  • the image processing circuit 32 is configured to receive the signal transmitted by the phase detecting device 4, and control the three-phase driving circuit according to the implemented signal, thereby controlling the projected image of the projection device by the rotation speed, frequency, and the like of the color wheel motor.
  • the color wheel motor is composed of ABC three-phase.
  • the three-phase current of each cycle when the motor is running is: AB, AC, BC, BA, CA, CB, and the voltages corresponding to the three phases of ACB are MA, MB and MC respectively.
  • the phase detecting means 4 is for detecting the voltages MA, MB and MC of the A-phase, B-phase and C-phase.
  • the voltage cycle of the three-phase electric power is in different cycles, and the phase of the three-phase electric current at the current time is judged according to the voltage values MA, MB and MC of the A-phase electric power, the B-phase electric power, and the C-phase electric power, and the three-phase driving circuit is detected by the phase detecting device.
  • the phase detecting means can thereby determine the operating state in which the color wheel motor is located, thereby determining the position at which the color wheel is located.
  • the phase detecting device 4 includes an acquisition module for collecting the phase of the three-phase driving circuit and a control module connected to the acquisition module.
  • the control module is used to control the collection module, receive and record the collection result of the collection module, specifically in the present In the embodiment, it is ADC (automatic Data collection automatic data collection) acquisition module 41 and MCU (Micro Control Unit, Micro Control Unit) module 42, wherein the ADC acquisition module is used to implement the detection and pickup of voltages MA, MB and MC of phase A, phase B and phase C. Since the voltage cycle of the three-phase power is in different cycles, the MCU module 42 can determine the current time three according to the three-phase electrical waveform diagrams shown in FIG. 2 according to the voltages MA, MB, and MC of the A-phase, B-phase, and C-phase powers. The phase of the phase, and determine if the phase is the preset phase.
  • ADC Automatic Data collection automatic data collection
  • MCU Micro Control Unit, Micro Control Unit
  • the voltage of the A phase is 0V
  • the voltage of the B phase is 0V
  • the phase C is high.
  • the dotted line is the set starting position, that is, the voltage of phase A is 0V
  • the voltage of phase B is 0V
  • the phase of phase C is high.
  • the color wheel motor 2 appears every cycle. There is only one point in a state, and the corresponding color wheel position is set as the starting position of the color wheel; of course, in other embodiments that can be selected, other phases can also be set as the starting position, as long as the calibration color can be achieved.
  • the role of the wheel phase can be implemented.
  • the detecting method of the color wheel phase detecting system of the present invention is specifically: when the projection device starts working, the ADC collecting module performs initialization, and then the three-phase driving The circuit detects and reads the voltage value of the ABC three-phase power.
  • the ADC acquisition module 41 of the phase detecting device 4 detects the preset phase, it detects that the voltage of the A phase power is 0V, and the voltage of the B phase power is 0V.
  • the MCU The module 42 determines that the current phase conforms to the preset phase and generates a pulse signal output to the control circuit 3, specifically to the image processing circuit 32.
  • the image processing circuit 32 can control the projection image of the projection device through the rotation speed, the frequency, and the like of the color wheel motor through the three-phase driving circuit to ensure that the image of each cycle of the color wheel is stable and Consistent.
  • the present invention provides a color wheel phase detecting system, which drives a color wheel to rotate by a three-phase motor, and detects three phases by using a phase detecting device.
  • the phase of the driving circuit detects the phase of the color wheel, which avoids the phenomenon that the projected image generated by the tape on the color wheel is not synchronized, the flower screen and the like, the reliability is good, the precision is high, the cost is low, and the user experience is good.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Astronomy & Astrophysics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

一种色轮相位检测方法、系统以及投影设备。相位检测系统包括色轮（1）和驱动色轮（1）转动的色轮电机（2）以及控制电路（3），色轮电机（2）为三相电机，控制电路（3）包括用于驱动色轮电机（2）运转的三相驱动电路（31）。相位检测系统还包括用于检测三相驱动电路（31）的相位检测装置（4），相位检测装置（4）在检测到预设相位时向控制电路（3）发送脉冲信号以实现色轮相位的检测，从而达到成本低、精度高，可靠性好的效果。

Description

色轮相位检测方法 、系统以及投影设备 技术领域
本发明涉及光学领域，尤其是涉及一种色轮相位检测方法、系统以及投影设备。
 背景技术
目前，激光投影技术发展迅速，并得到了广泛的应用。目前，单片DLP投影仪为由一种激发光激发出不同种类的受激光，经DMD输出不同颜色的图像，还原成真实的图像。
技术问题
色轮作为其中至关重要的部件，影响着投影设备的性能。在工作过程中，色轮的转速和相位需要和图像同步，色轮通常的同步方式是，在色轮电机上粘贴一块黑色的胶带，通过光电检测装置来检测转动色轮上的黑色胶带的位置，从而实现检测色轮的转速和相位。这种方式的弊端有二：一、色轮电机长期运转，上面的黑色胶带容易脱落，造成投影图像不同步，花屏现象，甚至无法开机；二、黑胶带的位置需要和色轮上面的色片对齐，生产过程中精度很难达到。
因此，实有必要提供一种新的色轮相位检测系统及检测方法以及投影设备以解决上述问题。
 技术解决方案
本发明主要解决的技术问题是提供一种色轮相位检测方法、系统以及投影设备，不仅简单有效而且成本低，具有良好的用户体验。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种色轮相位检测系统，包括色轮、驱动色轮转动的色轮电机以及控制电路，所述色轮电机为三相电机，所述控制电路包括用于控制所述色轮电机运转的三相驱动电路，所述色轮相位检测系统还包括用于检测所述三相驱动电路的相位检测装置，所述相位检测装置在检测到预设相位时向所述控制电路发送脉冲信号以实现色轮相位的检测.所述预设相位对应色轮的预设起始位置。
优选的，所述相位检测装置包括用于采集三相驱动电路相位的采集模块和与所述采集模块相连，用于控制所述采集模块、接收并记录所述采集模块采集结果的控制模块。
优选的，所述采集模块为ADC采集模块。
优选的，所述控制模块为MCU模块。
优选的，所述三相驱动电路包括A相电、B相电和C相电，所述ADC采集模块同时检测A相电、B相电和C相电的电压。
优选的，所述预设相位为A相电的电压为0V、B相电的电压为0V、C相电为高电平。
优选的，所述控制电路还包括用于接收相位检测装置发送的信号，并根据实施的信号通过控制三相驱动电路的图像处理电路。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种投影设备，包括如上所述的色轮相位检测系统。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种如上所述的色轮相位检测系统的色轮相位检测方法，所述色轮具有一预设的起始位置，色轮相位检测方法包括如下步骤：
通过相位检测装置实施检测三相驱动电路在各个时刻的相位。并判断所述相位是否是预设相位，所述预设相位对应色轮的预设起始位置；
当相位检测装置检测到三相驱动电路的相位为所述预设相位即发送一脉冲信号，所述预设相位对应色轮的预设起始位置。
优选的，相位检测装置检测三相驱动电路相位的方法包括如下步骤：
通过ADC模块采集A相电、B相电和C相电的电压MA、MB和MC；
三相电的电压循环处于不同的周期，根据A相电、B相电和C相电的电压MA、MB和MC判断当前时刻三相电的相位。
优选的，所述色轮的起始位置为A相电的电压为0V、B相电的电压为0V和C相电为高电平时对应的色轮位置。
 有益效果
本发明的有益效果是：区别于现有技术的情况，本发明提供一种色轮相位检测系统，通过三相电机驱动色轮转动，利用相位检测装置检测三相驱动电路的相位从而检测色轮的相位，可以避免在色轮上贴胶带而产生的投影图像不同步，花屏等现象，可靠性好，且精度高成本低，具有较好的用户体验。
 附图说明
图1是本发明色轮相位检测系统的结构示意图；
图2是三相驱动电路对应三相电的电压示意图；
图3是本发明色轮相位检测系统的相位检测装置的结构示意图；
图4是本发明色轮相位检测系统的检测流程图。
 本发明的最佳实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
请参阅图1，本发明的色轮相位检测系统包括色轮1、驱动色轮1转动的色轮电机2、控制电路3以及相位检测装置4。
其中色轮电机2为三相电机。控制电路3包括用于驱动色轮电机2运转的三相驱动电路31以及图像处理电路32。其中三相驱动电路31产生了A相电、B相电和C相电以分别输入色轮电机2及相位检测装置4的输入端，用于驱动色轮电机2工作，从而驱动色轮转动。图像处理电路32用于接收相位检测装置4发送的信号，并根据实施的信号控制三相驱动电路，从而通过色轮电机的转速、频率等控制投影设备的投影图像。
对应的，色轮电机由ABC三相组成，电机运转时每个周期的三相的电流是：AB、AC、BC、BA、CA、CB，对应ACB三相的电压分别为MA、MB和MC，具体如图2所示。相位检测装置4用于检测A相电、B相电和C相电的电压MA、MB和MC。三相电的电压循环处于不同的周期，根据A相电、B相电和C相电的电压值MA、MB和MC判断当前时刻三相电的相位，通过相位检测装置实施检测三相驱动电路在各个时刻的相位，相位检测装置可因此判断色轮电机所处的工作状态，从而判断色轮所处的位置。
参照图3所示，相位检测装置4包括用于采集三相驱动电路相位的采集模块和与采集模块相连的控制模块，控制模块用于控制采集模块、接收并记录采集模块采集结果，具体在本实施方式中，为ADC（automatic data collection 自动数据收集）采集模块41和MCU（Micro Control Unit，微控制单元）模块42，其中ADC采集模块用于实施检测并拾取A相电、B相电和C相电的电压MA、MB和MC。由于三相电的电压循环处于不同的周期，MCU模块42根据A相电、B相电和C相电的电压MA、MB和MC参照图2所示的三相电波形图可以判断当前时刻三相电的相位，并判断该相位是否是预设相位。
设定一预设相位以确定色轮1的起始位置，具体在本实施方式中，设定为A相电的电压为0V、B相电的电压为0V和C相电为高电平，参照附图2，虚线处即为设定的起始位置，即A相电的电压为0V、B相电的电压为0V和C相电为高电平，色轮电机2每个周期出现这一状态只有一个点，此时对应的色轮位置设定为色轮的起始位置；当然，在可选择的其他实施方式中，也可以设置其他相位作为起始位置，只要能够起到标定色轮相位的作用，即是可以实施的。
参照图4所示，为本发明色轮相位检测系统的检测流程图，本发明色轮相位检测系统的检测方法具体为，当投影设备开始工作时，ADC采集模块进行初始化，进而对三相驱动电路进行检测并读取ABC三相电的电压值，当相位检测装置4的ADC采集模块41检测到所述预设相位，即检测到A相电的电压为0V、B相电的电压为0V和C相电为高电平（VCC）时，MCU 模块42会判断当前相位符合预设相位，并产生一脉冲信号输出到控制电路3，具体为到图像处理电路32。这样，每检测到一个脉冲信号，即可以得知色轮转到初始位置，从而实现了色轮相位的检测。
进一步的，当检测到色轮起始位置后，图像处理电路32可以通过三相驱动电路通过色轮电机的转速、频率等控制投影设备的投影图像，以保证色轮每一周期的图像稳定且一致。
区别于现有技术的情况，本发明的有益效果是：区别于现有技术的情况，本发明提供一种色轮相位检测系统，通过三相电机驱动色轮转动，利用相位检测装置检测三相驱动电路的相位从而检测色轮的相位，可以避免了在色轮上贴胶带而产生的投影图像不同步，花屏等现象，可靠性好，且精度高成本低，具有较好的用户体验。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (11)

1.一种色轮相位检测系统，包括色轮、驱动所述色轮转动的色轮电机以及控制电路，其特征在于，所述色轮电机为三相电机，所述控制电路包括用于控制所述色轮电机运转的三相驱动电路，所述色轮相位检测系统还包括用于检测所述三相驱动电路的相位检测装置，所述相位检测装置在检测到预设相位时向所述控制电路发送脉冲信号以实现色轮相位的检测，所述预设相位对应色轮的预设起始位置。
2.根据权利要求1所述的色轮相位检测系统，其特征在于，所述相位检测装置包括用于采集三相驱动电路相位的采集模块和与所述采集模块相连的控制模块，所述控制模块用于控制所述采集模块、接收并记录所述采集模块采集结果。
3.根据权利要求2所述的色轮相位检测系统，其特征在于，所述采集模块为ADC采集模块。
4.根据权利要求2所述的色轮相位检测系统，其特征在于，所述控制模块为MCU模块。
5.根据权利要求3所述的色轮相位检测系统，其特征在于，所述三相驱动电路包括A相电、B相电和C相电，所述ADC采集模块同时检测A相电、B相电和C相电的电压。
6.根据权利要求5所述的色轮相位检测系统，其特征在于，所述预设相位为A相电的电压为0V、B相电的电压为0V、C相电为高电平。
7.根据权利要求1所述的色轮相位检测系统，其特征在于，所述控制电路还包括用于接收相位检测装置发送的信号，并根据实施的信号通过控制三相驱动电路的图像处理电路。
8.一种投影设备，其特征在于，包括如权利要求1到7任意一项所述的色轮相位检测系统。
9.一种利用如权利要求1到7所述的任意一项所述的色轮相位检测系统进行色轮相位检测的方法，所述色轮具有一预设的起始位置，其特征在于，色轮相位检测方法包括如下步骤：
通过相位检测装置实施检测三相驱动电路在各个时刻的相位，并判断所述相位是否是预设相位，所述预设相位对应色轮的预设起始位置；
当相位检测装置检测到三相驱动电路的相位为所述预设相位即发送一脉冲信号，所述预设相位对应色轮的预设起始位置。
10.根据权利要求9所述的色轮相位检测方法，其特征在于，相位检测装置检测三相驱动电路相位的方法包括如下步骤：
通过ADC模块采集A相电、B相电和C相电的电压MA、MB和MC；
三相电的电压循环处于不同的周期，根据A相电、B相电和C相电的电压MA、MB和MC判断当前时刻三相电的相位。
11.根据权利要求9所述的色轮相位检测方法，其特征在于，所述色轮的起始位置为A相电的电压为0V、B相电的电压为0V和C相电为高电平时对应的色轮位置。
PCT/CN2017/103438 2017-06-22 2017-09-26 色轮相位检测方法、系统以及投影设备 Ceased WO2018233115A1 (zh)

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