WO2022041073A1 - 一种头戴设备背光装置控制方法及装置 - Google Patents

一种头戴设备背光装置控制方法及装置 Download PDF

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Publication number
WO2022041073A1
WO2022041073A1 PCT/CN2020/111896 CN2020111896W WO2022041073A1 WO 2022041073 A1 WO2022041073 A1 WO 2022041073A1 CN 2020111896 W CN2020111896 W CN 2020111896W WO 2022041073 A1 WO2022041073 A1 WO 2022041073A1
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Prior art keywords
data
code
pwm
signal
image
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PCT/CN2020/111896
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English (en)
French (fr)
Inventor
李桂玉
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南京英维尔科技服务有限公司
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Priority to PCT/CN2020/111896 priority Critical patent/WO2022041073A1/zh
Publication of WO2022041073A1 publication Critical patent/WO2022041073A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals

Definitions

  • the present application relates to the technical field of virtual reality, and in particular, to a method and device for controlling a backlight device of a head-mounted device.
  • a headset is a human-computer interaction device.
  • head-mounted device systems include two types: external and integrated.
  • the external head-mounted device system is provided with an independent screen, a computer host connected to the independent screen, and input and output devices, while the integrated head-mounted device system does not have any input.
  • the output device, the data processor is also provided in the headset.
  • Figure 1-1 shows an external head mounted device system with an operation handle, wherein the operation handles 11 and 12 are integrated with a data processing system and input and output devices, and the head mounted device 13 is connected with the handles 11 and 12 through data lines .
  • the all-in-one head-mounted device system may refer to the head-mounted device 13 in form, and the data processor of the system is provided in the head-mounted device 13 .
  • the display system part of the head-mounted device 13 refers to FIGS. 1-2, wherein the display module 21 is carried in the frame 131, which includes a backlight module 211, a display screen 212 and a lens group 213, and the image displayed on the display screen 212 passes through the lens group. 213, image in the wearer's eye near the lens group 213.
  • the backlight module 211 can provide sufficient brightness and evenly distributed light sources, so that the display screen 212 can display images normally.
  • the frame 131 is required to be as thin and light as possible.
  • the distance from the display screen 212 to the eyes is smaller, and since the display screen 212 of the head-mounted device provides images for the left and right eyes respectively, therefore, due to this special structure, and the response of the display screen 212 Due to reasons such as time, persistence of vision, brightness of the backlight module 211, etc., the video image displayed on the display screen 212 will form a smear in the wearer's eyes, thereby affecting the wearer's experience.
  • the present application provides a method and device for controlling a backlight device of a head-mounted device, so as to solve the problem that the video image displayed in the current thin and light head-mounted display device will form a smear in the wearer's eyes, thereby affecting the wearer's experience effect.
  • the present application provides a method for controlling a backlight device of a head-mounted device, which is used for a head-mounted device including a backlight circuit and a display system, including:
  • Amplifying the PWM pulse sequence signal and outputting the amplified PWM pulse sequence signal to the backlight circuit, so that the backlight circuit turns on or off according to the control of the PWM pulse sequence signal.
  • the method further includes: collecting a current signal of the backlight circuit, and amplifying the PWM pulse sequence signal according to the current signal.
  • the method further includes: collecting motion signals output by the headset, converting the motion signals into motion data; and obtaining PWM signal control parameters according to the collected motion data.
  • the motion data includes gravitational acceleration data
  • the PWM signal control parameters are obtained according to the motion data according to the following steps:
  • Select the video file set the PWM parameter table of image playback, and the parameter table includes control parameters for controlling the lighting or extinguishing of the backlight circuit;
  • the encoding is qualified data encoding, determine whether the currently playing image is the best image through the data encoding, if it is the best image, obtain the control parameters corresponding to the best image; if it is not the best image, continue to follow the
  • the parameter table plays the video file or exits according to the headset.
  • the motion data includes angular velocity data
  • the PWM signal control parameters are obtained according to the motion data according to the following steps:
  • Select the video file set the PWM parameter table of image playback, and the parameter table includes control parameters for controlling the lighting or extinguishing of the backlight circuit;
  • the video file is played in the head-mounted device; and, the angular velocity data is collected periodically, and the angular velocity data code is generated according to the set rule;
  • the encoding is qualified data encoding, determine whether the currently playing image is the best image through the data encoding, if it is the best image, obtain the control parameters corresponding to the best image; if it is not the best image, continue to follow the
  • the parameter table plays the video file or exits according to the headset.
  • the motion data includes direction data
  • the PWM signal control parameters are obtained according to the motion data according to the following steps:
  • Select the video file set the PWM parameter table of image playback, and the parameter table includes control parameters for controlling the lighting or extinguishing of the backlight circuit;
  • the video file is played in the head-mounted device; and, the direction data is periodically collected, and the angular velocity data code is generated according to the set rule;
  • the encoding is qualified data encoding, determine whether the currently playing image is the best image through the data encoding, if it is the best image, obtain the control parameters corresponding to the best image; if it is not the best image, continue to follow the
  • the parameter table plays the video file or exits according to the headset.
  • the motion data includes gravitational acceleration data and angular velocity data
  • the PWM signal control parameters are obtained according to the motion data according to the following steps:
  • Select a video file set a PWM parameter table for image playback, and the parameter table includes control parameters for controlling the lighting or extinguishing of the backlight circuit;
  • the head-mounted device in the head-mounted device, according to the described video file of playing; And, periodically gather the gravitational acceleration data and the angular velocity data, according to the setting rule, generate the angular velocity data encoding;
  • the encoding is qualified data encoding, determine whether the currently playing image is the best image through the data encoding, if it is the best image, obtain the control parameters corresponding to the best image; if it is not the best image, continue to follow the
  • the parameter table plays the video file or exits according to the headset.
  • the motion data includes gravitational acceleration data and orientation data
  • the PWM signal control parameters are obtained according to the motion data according to the following steps:
  • Select a video file set a PWM parameter table for image playback, and the parameter table includes control parameters for controlling the lighting or extinguishing of the backlight circuit;
  • the video file is played in the head-mounted device; and, the gravitational acceleration data and the direction data are collected periodically, and the angular velocity data code is generated according to the set rule;
  • the encoding is qualified data encoding, determine whether the currently playing image is the best image through the data encoding, if it is the best image, obtain the control parameters corresponding to the best image; if it is not the best image, continue to follow the
  • the parameter table plays the video file or exits according to the headset.
  • the motion data includes angular velocity data and direction data
  • the PWM signal control parameters are obtained according to the motion data according to the following steps:
  • Select a video file set a PWM parameter table for image playback, and the parameter table includes control parameters for controlling the lighting or extinguishing of the backlight circuit;
  • the video file is played in the head-mounted device; and, angular velocity data and direction data are collected periodically, and the angular velocity data code is generated according to a set rule;
  • the encoding is qualified data encoding, determine whether the currently playing image is the best image through the data encoding, if it is the best image, obtain the control parameters corresponding to the best image; if it is not the best image, continue to follow the
  • the parameter table plays the video file or exits according to the headset.
  • the motion data includes gravitational acceleration data, angular velocity data and direction data
  • the PWM signal control parameters are obtained according to the motion data according to the following steps:
  • Select a video file set a PWM parameter table for image playback, and the parameter table includes control parameters for controlling the lighting or extinguishing of the backlight circuit;
  • the video file is played in the head-mounted device; and, the gravitational acceleration data, the angular velocity data and the direction data are collected periodically, and the angular velocity data code is generated according to the set rule;
  • the encoding is qualified data encoding, determine whether the currently playing image is the best image through the data encoding, if it is the best image, obtain the control parameters corresponding to the best image; if it is not the best image, continue to follow the
  • the parameter table plays the video file or exits according to the headset.
  • Embodiments of the present application also provide a device for controlling a backlight device of a head-mounted device, the device comprising:
  • the display parameter acquisition module is used to acquire the display parameters of the display system
  • control signal generation module configured to generate a control parameter of the PWM signal according to the display parameter, convert the control parameter into a control signal, and the control parameter includes the pulse width and the pulse delay time of the PWM pulse sequence;
  • a pulse signal generation module configured to generate a corresponding PWM pulse sequence signal according to the synchronization signal of the image display frame of the display system and the control signal;
  • the pulse signal amplification module is used for amplifying the PWM pulse sequence signal, and outputting the amplified PWM pulse sequence signal to the backlight circuit, so that the backlight circuit can be turned on or off according to the control of the PWM pulse sequence signal.
  • control method and device for the backlight device of the head mounted device can obtain the display parameters of the display system; generate the control parameters of the PWM signal according to the display parameters, and convert the control parameters into control signals;
  • the synchronization signal and control signal of the image display frame generate a corresponding PWM pulse sequence signal; amplify the PWM pulse sequence signal, and output the amplified PWM pulse sequence signal to the backlight circuit, so that the backlight circuit is lit according to the control of the PWM pulse sequence signal or off.
  • the solution of the present application can generate a PWM pulse sequence signal by using a duty cycle suitable for the display system and an appropriate delay, so that the PWM pulse sequence signal can be continuously optimized and adjusted, and then the lighting or extinguishing of the backlight circuit can be adjusted more accurately, thereby solving the problem of Displays an issue with video image smears in the display system.
  • 1-1 is a schematic diagram of a head-mounted device in the prior art
  • FIGS. 1-2 are schematic diagrams of a head-mounted device display system in the prior art
  • FIG. 2 is a structural diagram of a control circuit of a backlight device of a head-mounted device shown in an embodiment of the application;
  • FIG. 3 is a structural diagram of a control circuit of another head-mounted device backlight device shown in an embodiment of the application;
  • Fig. 4 is the circuit schematic diagram of the PWM signal generator shown in the embodiment of the application.
  • FIG. 5 is a circuit diagram of a PWM signal driver shown in an embodiment of the application.
  • FIG. 6 is a circuit diagram of another PWM signal driver shown in the embodiment of the application.
  • the video images displayed in the thin and light head-mounted display devices may form smears in the eyes of the wearer, thereby affecting the experience of the wearer.
  • the embodiments of the present application provide a method and device for controlling a backlight device of a head-mounted device, which utilizes a duty cycle suitable for the display system and an appropriate delay to generate a PWM pulse sequence signal, so that the PWM pulse sequence signal can continuously Optimizing and adjusting, and then adjusting the lighting or extinguishing of the backlight circuit more accurately, thereby solving the problem of smearing such as video images displayed in the display system.
  • FIG. 2 is a structural diagram of a control circuit of a backlight device of a head mounted device shown in an embodiment of the application.
  • the method for controlling the backlight device of the head-mounted device provided by the embodiment of the present application is implemented based on the circuit shown in FIG. 2 .
  • the circuit in FIG. 2 specifically includes: the backlight circuit 2 and the display system 3 of the head-mounted device 13 , and also includes sequentially connected PWM signals A parameter processor 4 , a PWM signal generator 5 , a PWM signal driver 6 and a brightness signal acquisition circuit 7 .
  • Step S101 acquiring display parameters of the display system 3 .
  • Step S102 Generate a control parameter of the PWM signal according to the display parameter, and convert the control parameter into a control signal, where the control parameter includes a pulse width and a pulse delay time of the PWM pulse sequence.
  • Step S103 generating a corresponding PWM pulse sequence signal according to the synchronization signal of the image display frame of the display system 3 and the control signal.
  • Step S104 amplify the PWM pulse sequence signal, and output the amplified PWM pulse sequence signal to the backlight circuit 2, so that the backlight circuit 2 is turned on or off according to the control of the PWM pulse sequence signal.
  • the PWM signal parameter processor 4 can obtain the display parameters of the display system 3, and generate the control parameters of the PWM signal according to the display parameters, and then convert the control parameters into control signals, and output the control signals to the PWM signal generator 5.
  • the display parameters can be used to represent the feedback data of the display effect such as video images on the display system 3. These feedback data can be obtained according to large data or large sample tests, including the pulse width (or the pulse width (or occupation) of the PWM pulse sequence that can reflect the best display effect. Duty ratio) and pulse delay time, these signal data can be stored in the memory or register of the processor, and the generation means to read out from the memory or register and output to the PWM signal generator 5.
  • the control parameters include the obtained pulse width and pulse delay time of the specific PWM pulse sequence.
  • the PWM signal generator 5 generates a corresponding PWM pulse sequence signal according to the synchronization signal of the image display frame of the display system 3 and the control signal, and outputs the PWM pulse sequence signal to the PWM signal driver 6 .
  • the display parameters include the image display frame data on the display system 3.
  • the PWM signal parameter processor 4 can determine the sequence composition of the synchronization signal of the image display frame according to the image display frame, such as the arrangement of high and low levels of the sequence. Combined with the previously acquired control parameters, etc., a PWM pulse sequence signal with appropriate pulse width (or duty cycle) and pulse delay time can be determined by analysis.
  • the PWM signal parameter processor 4 can determine the time gap between adjacent image frames through the image display frame data, and generate a control signal, so that the control signal can instruct the backlight circuit to turn off when the time gap between adjacent image frames occurs, and then Achieves the purpose of inserting a completely black frame between image frames.
  • the backlight circuit should be lit.
  • the lighting or extinguishing of the backlight circuit is also controlled by a PWM pulse sequence signal, wherein when a high level occurs in the PWM pulse sequence, the backlight circuit can be instructed to light up, and when a low level occurs in the PWM pulse sequence, it can be instructed The backlight circuit goes out.
  • PWM Pulse width modulation, pulse width modulation
  • the basic principle of PWM is to control the on-off of the switching device of the inverter circuit, so that the output terminal can obtain a series of pulses with equal amplitudes. Instead of a sine wave or desired waveform.
  • the amplitude of each pulse is equal.
  • the pulse voltage output by the PWM inverter circuit is the amplitude of the DC side voltage.
  • the PWM signal driver 6 amplifies the PWM pulse sequence signal, and outputs the amplified PWM pulse sequence signal to the backlight circuit 2, so that the backlight circuit 2 is turned on or off according to the control of the PWM pulse sequence signal.
  • the current signal of the backlight circuit 2 may also be collected, and the PWM pulse sequence signal may be amplified according to the current signal.
  • the brightness signal collection circuit 7 in FIG. 2 can collect the current signal of the backlight circuit 2, and output the current signal to the PWM signal driver 6, so as to control the PWM signal driver 6 to amplify all the the PWM pulse train signal.
  • the process of collecting the brightness signal can be regarded as a feedback process.
  • the amplification degree of the PWM pulse sequence signal is continuously adjusted, so that the image display has better brightness.
  • control method for the backlight device of the head mounted device in the above embodiment can generate a PWM pulse sequence signal by using a duty cycle suitable for the display system and an appropriate delay, and can better adjust the PWM pulse sequence in combination with the current control of the backlight circuit 2.
  • the PWM pulse sequence signal can be continuously optimized and adjusted, and then the lighting or extinguishing of the backlight circuit 2 can be adjusted more accurately, thereby solving the problem of smearing of the video image displayed in the display system 3 .
  • the above method may further include: collecting motion signals output from the head mounted device 13, converting the motion signals into motion data; and obtaining PWM signal control parameters according to the collected motion data.
  • FIG. 3 is a structural diagram of another head-mounted device backlight device control circuit shown in the embodiment of the application. As shown in FIG. 3 , the head-mounted device backlight device control circuit in the above-mentioned embodiment may further include the same circuit as the one described above.
  • the sensor 8 connected to the head mounted device 13 and the signal analyzer 9 connected to the sensor 8 .
  • the sensor 8 collects the motion signal output by the head mounted device 13 and outputs the motion signal to the signal analyzer 9 .
  • the signal parser 9 converts the motion signal into motion data, and outputs the motion data to the PWM signal parameter processor 4 .
  • the PWM signal parameter processor 4 generates control parameters of the PWM signal according to the action data.
  • the motion signal may be used to represent the direction of the head motion of the user wearing the headset, the angle of the motion, the distance of the motion, or the speed of the motion, and the like.
  • the action signal represents the posture of the headset, that is, the direction of gravity and the direction of rotation, and so on.
  • it is necessary to detect the user's action so that the user can swing his head to change the posture of the head-mounted device 13 when there is a smear problem in the image or when the appearance is not good.
  • the change of the posture can be detected by the sensor 8, and then through a series of calculations, it can be known whether the current image quality meets the requirements.
  • the senor 8 may be an acceleration sensor; the acceleration sensor collects the gravitational acceleration signal output by the head mounted device 13 , and outputs the gravitational acceleration signal to the signal parser 9 .
  • the motion data includes gravitational acceleration data
  • the PWM signal control parameters are obtained according to the motion data according to the following steps:
  • Step S201 select a video file, and set a PWM parameter table for image playback, where the parameter table includes control parameters for controlling the backlight circuit 2 to be turned on or off.
  • some image data of the video file can be used as the display parameters in the above-mentioned embodiment.
  • the PWM signal parameter processor 4 can analyze a series of optional control parameters, but currently it is not possible to Determine which control parameter can make the best display of the image, therefore, further screening is required in combination with the gravitational acceleration data.
  • Step S202 playing the video file in the head mounted device 13 according to the parameter table; and periodically collecting gravitational acceleration data, and generating gravitational acceleration data codes according to a set rule.
  • Step S203 determine whether the code is a qualified data code, and if the code is not a qualified data code, continue to periodically collect the gravitational acceleration data.
  • the PWM signal parameter processor 4 can generate the gravitational acceleration data code according to the gravitational acceleration data according to its preset conversion rules, and then judge the gravitational acceleration data code according to the code corresponding to the preset satisfactory attitude. If the corresponding codes are the same or similar, the gravitational acceleration data encoding can be regarded as qualified to obtain the encoding.
  • Step S204 if the encoding is a qualified data encoding, judge whether the currently playing image is the best image by the data encoding, if it is the best image, obtain the control parameter corresponding to the best image; if it is not the best image , continue to play the video file or exit in the head mounted device 13 according to the parameter table.
  • control parameter corresponding to the best image is determined as the best parameter for playing the video file, and after playing the video file, the video file can be played directly according to the control parameter to avoid the problem of image smearing.
  • the sensor 8 may also be a gyroscope sensor, a geomagnetic sensor, or a combination of any two sensors including the above acceleration sensor or a combination of three sensors; the gyroscope sensor collects the headset 13 For the output angular velocity signal, the geomagnetic sensor collects the direction signal output by the head-mounted device 13 .
  • the gyroscope sensor and the geomagnetic sensor have the same function as the above-mentioned acceleration sensor.
  • the motion data includes angular velocity data.
  • the angular velocity data needs to be collected periodically, and the angular velocity data code is generated according to the set rule.
  • the code is not a qualified data code, continue to collect angular velocity data periodically.
  • the motion data includes direction data.
  • the direction data needs to be collected periodically, and the direction data code is generated according to the set rule.
  • the code is not a qualified data code, continue to collect direction data periodically.
  • the motion data includes gravitational acceleration data and angular velocity data.
  • the code is not a qualified data code, continue to periodically collect the gravitational acceleration data and the angular velocity data.
  • the motion data includes gravitational acceleration data and orientation data. And in the above step S102, it is necessary to periodically collect the gravitational acceleration data and the direction data, and generate the angular velocity data code according to the set rule. In the above step S103, if the code is not a qualified data code, continue to periodically collect the gravitational acceleration data and the direction data.
  • the motion data includes angular velocity data and direction data.
  • the code is not a qualified data code, continue to periodically collect angular velocity data and direction data.
  • the motion data includes gravitational acceleration data, angular velocity data, and orientation data.
  • the code is not a qualified data code, continue to periodically collect the gravitational acceleration data, the angular velocity data and the direction data.
  • FIG. 4 is a schematic circuit diagram of the PWM signal generator shown in the embodiment of the application.
  • the PWM signal generator 5 in the embodiment of the present application includes an adder 61 and a PWM generator 62 connected to the adder 61 .
  • the adder 61 generates a PWM sequence according to the control signal b and the synchronization signal a of the image display frame, and outputs the PWM sequence to the PWM generator 62; c in FIG. 4 represents the pulse delay time.
  • the PWM generator 62 outputs the amplified PWM pulse sequence signal to the backlight circuit 2 according to the PWM sequence, so that the backlight circuit 2 is turned on or off according to the control of the PWM pulse sequence signal.
  • FIG. 5 is a circuit diagram of a PWM signal driver shown in the embodiment of the application.
  • the PWM signal driver 6 may include: a driving chip 71 , an inductor L 1 72 , a capacitor C IN 73 , a capacitor C OUT 74 , a diode D 1 75 and a resistor R 1 76 .
  • the sixth pin of the driving chip 71 is connected with a DC power supply, and the sixth pin of the driving chip 71 is also connected to the first end of the inductor L172 and the fourth pin of the driving chip 71; the driving The first pin of the chip 71 is connected to the second end of the inductor L 1 72 ; the third pin of the driving chip 71 is connected to the first end of the variable resistor R 1 76 , and the second end of the resistor R 1 76 is grounded.
  • the second end of the inductor L 1 72 is also connected to the anode of the diode D 1 75, and the cathode of the diode D 1 75 is connected to the input end of the backlight circuit 2; the output end of the backlight circuit 2 is connected to the first end of the resistor R 1 (76). one end.
  • the anode of the capacitor C IN 73 is connected to the sixth pin of the driving chip 71 , the cathode of the capacitor C IN 73 is grounded; the anode of the capacitor C OUT 74 is connected to the cathode of the diode D 1 75 , and the cathode of the capacitor C OUT 74 is grounded.
  • FIG. 6 is a circuit diagram of another PWM signal driver shown in the embodiment of the application.
  • the PWM signal driver 6 may further include: a driving chip 71 , an inductor L 1 72 , a capacitor C IN 73 , a capacitor C OUT 74 , a diode D 1 75 , a resistor R 1 76 , a resistor R 2 77 , and a resistor R 378 .
  • the sixth pin of the driving chip 71 is connected with a DC power supply, and the sixth pin of the driving chip 71 is also connected to the first end of the inductor L172 and the fourth pin of the driving chip 71; the driving The first pin of the chip 71 is connected to the second end of the inductor L 1 72 ; the third pin of the driving chip 71 is connected to the first end of the resistor R 2 77 , and the second end of the resistor R 2 77 is grounded.
  • the first end of the resistor R 2 77 is also connected to the second end of the resistor R 3 78 , and the first end of the resistor R 3 78 is connected to the cathode of the diode D 1 75 .
  • the second end of the inductor L172 is also connected to the anode of the diode D175, and the cathode of the diode D175 is connected to the input end of the backlight circuit 2; the output end of the backlight circuit 2 is connected to the first end of the resistor R176 ; The second terminal of resistor R1 76 is grounded.
  • the anode of the capacitor C IN 73 is connected to the sixth pin of the driving chip 71 , the cathode of the capacitor C IN 73 is grounded; the anode of the capacitor C OUT 74 is connected to the cathode of the diode D 1 75 , and the cathode of the capacitor C OUT 74 is grounded.
  • the driver chip 71 in the above-mentioned embodiment may adopt an AP3127B driver chip.
  • AP3127B driver chip is a step-up DC/DC converter with fixed oscillation frequency and constant current output, which is very suitable for backlight driving of electronic products such as mobile phones and digital cameras.
  • the output voltage can reach 16V
  • the 3.2V output voltage can drive four series LEDs
  • the 2.5V input voltage can drive two parallel LEDs (three LEDs in series).
  • the brightness of the LED can be controlled by changing the duty cycle of the PWM signal on the CE pin.
  • a field effect transistor with an on-resistance of 0.8 ⁇ is integrated inside, and miniature inductors and capacitors can be used externally to reduce the area of the printed board.
  • an embodiment of the present application also provides a head-mounted device backlight device control device, including: a display parameter acquisition module for acquiring display parameters of a display system; a control signal generation module for generating a PWM signal according to the display parameters
  • the control parameters are converted into control signals, and the control parameters include the pulse width and pulse delay time of the PWM pulse sequence; the pulse signal generation module is used to display the synchronization signal of the frame and the described image according to the image of the display system.
  • the control signal generates a corresponding PWM pulse sequence signal; the pulse signal amplification module is used to amplify the PWM pulse sequence signal, and output the amplified PWM pulse sequence signal to the backlight circuit, so that the backlight circuit can follow the PWM pulse sequence signal
  • the pulse signal amplification module is further configured to collect the current signal of the backlight circuit, and amplify the PWM pulse sequence signal according to the current signal.
  • the control signal generation module is further configured to collect motion signals output by the head-mounted device, and convert the motion signals into motion data; and obtain PWM signal control parameters according to the collected motion data.
  • the control signal generation module is also used to obtain PWM signal control parameters according to the action data according to the following steps: select a video file, set a PWM parameter table for image playback, and the parameter table includes a control for controlling the lighting or extinguishing of the backlight circuit parameter; play the video file in the head-mounted device according to the parameter table; and, periodically collect the gravitational acceleration data, and generate the gravitational acceleration data encoding according to the set rule; judge whether the encoding is a qualified data encoding, if If the encoding is not qualified data encoding, continue to collect gravitational acceleration data periodically; if the encoding is qualified data encoding, determine whether the currently playing image is the best image through the data encoding, and if it is the best image, obtain The control parameter corresponding to the best image; if it is not the best image, continue to play the video file or exit in the head mounted device according to the parameter table.
  • the control signal generation module is also used to obtain PWM signal control parameters according to the action data according to the following steps: select a video file, set a PWM parameter table for image playback, and the parameter table includes a control for controlling the lighting or extinguishing of the backlight circuit parameters; play the video file in the head mounted device according to the parameter table; and, collect angular velocity data periodically, and generate angular velocity data encoding according to the set rule; determine whether the encoding is a qualified data encoding, if all If the encoding is not qualified data encoding, continue to collect angular velocity data periodically; if the encoding is qualified data encoding, judge whether the currently playing image is the best image through the data encoding, and if it is the best image, obtain the Control parameters corresponding to the best image; if it is not the best image, continue to play the video file in the headset according to the parameter table or exit.
  • the control signal generation module is also used to obtain PWM signal control parameters according to the action data according to the following steps: select a video file, set a PWM parameter table for image playback, and the parameter table includes a control for controlling the lighting or extinguishing of the backlight circuit parameters; play the video file in the head mounted device according to the parameter table; and, periodically collect the direction data, and generate the angular velocity data code according to the set rule; judge whether the code is a qualified data code, if all If the encoding is not a qualified data encoding, continue to periodically collect the direction data; if the encoding is a qualified data encoding, determine whether the currently playing image is the best image through the data encoding, and if it is the best image, obtain the Control parameters corresponding to the best image; if it is not the best image, continue to play the video file in the headset according to the parameter table or exit.
  • the control signal generation module is also used to obtain PWM signal control parameters according to the action data according to the following steps: select a video file, set a PWM parameter table for image playback, and the parameter table includes a control for controlling the lighting or extinguishing of the backlight circuit parameters; play the video file in the head-mounted device according to the parameter table; and periodically collect the gravitational acceleration data and the angular velocity data, and generate the angular velocity data code according to the set rule; judge whether the code is qualified data Encoding, if the encoding is not qualified data encoding, continue to collect gravitational acceleration data and angular velocity data periodically; if the encoding is qualified data encoding, judge whether the currently playing image is the best image by the data encoding, if If it is the best image, obtain the control parameters corresponding to the best image; if it is not the best image, continue to play the video file or exit in the head mounted device according to the parameter table.
  • the control signal generation module is also used to obtain PWM signal control parameters according to the action data according to the following steps: select a video file, set a PWM parameter table for image playback, and the parameter table includes a control for controlling the lighting or extinguishing of the backlight circuit parameters; play the video file in the head-mounted device according to the parameter table; and periodically collect the gravitational acceleration data and the direction data, and generate the angular velocity data code according to the set rule; judge whether the code is qualified data Encoding, if the encoding is not qualified data encoding, continue to collect gravitational acceleration data and direction data periodically; if the encoding is qualified data encoding, judge whether the currently playing image is the best image by the data encoding, if If it is the best image, obtain the control parameters corresponding to the best image; if it is not the best image, continue to play the video file or exit in the head mounted device according to the parameter table.
  • the control signal generation module is also used to obtain PWM signal control parameters according to the action data according to the following steps: select a video file, set a PWM parameter table for image playback, and the parameter table includes a control for controlling the lighting or extinguishing of the backlight circuit parameters; play the video file in the head-mounted device according to the parameter table; and periodically collect angular velocity data and direction data, and generate angular velocity data encoding according to a set rule; determine whether the encoding is a qualified data encoding , if the encoding is not a qualified data encoding, continue to periodically collect angular velocity data and direction data; if the encoding is a qualified data encoding, determine whether the currently playing image is the best image by the data encoding, if it is the most If it is not the best image, continue to play the video file in the head mounted device according to the parameter table or exit.
  • the control signal generation module is also used to obtain PWM signal control parameters according to the action data according to the following steps: select a video file, set a PWM parameter table for image playback, and the parameter table includes a control for controlling the lighting or extinguishing of the backlight circuit parameters; play the video file in the head-mounted device according to the parameter table; and periodically collect gravitational acceleration data, angular velocity data and direction data, and generate an angular velocity data encoding according to a set rule; determine whether the encoding is Qualified data coding, if the coding is not qualified data coding, continue to periodically collect gravitational acceleration data, angular velocity data and direction data; if the coding is qualified data coding, judge the currently playing image by the data coding Whether it is the best image, if it is the best image, obtain the control parameters corresponding to the best image; if it is not the best image, continue to play the video file or exit in the head mounted device according to the parameter table.

Abstract

一种头戴设备背光装置控制方法及装置，可以获取显示系统的显示参数；根据显示参数生成PWM信号的控制参数，将控制参数转化为控制信号；根据显示系统的图像显示帧的同步信号和控制信号生成对应的PWM脉冲序列信号；放大PWM脉冲序列信号，以及，输出放大后的PWM脉冲序列信号到背光电路，以使背光电路按照PWM脉冲序列信号的控制点亮或熄灭。该方案可以利用适合显示系统的占空比和适当的延时生成PWM脉冲序列信号，使得PWM脉冲序列信号能够不断地优化调整，进而更加精确地调整背光电路的点亮或者熄灭，进而解决显示系统中显示视频图像拖影的问题。

Description

一种头戴设备背光装置控制方法及装置 技术领域
本申请涉及虚拟现实技术领域，尤其涉及一种头戴设备背光装置控制方法及装置。
背景技术
头戴设备是一种人机交互设备。常用的头戴设备系统包括外接式和一体式两种，其中，外接式头戴设备系统设置有独立屏幕和与独立屏幕连接的计算机主机和输入输出设备，而一体式头戴设备系统没有任何输入输出设备，数据处理器也设置在头戴设备中。图1-1示出了带有操作手柄的外接式头戴设备系统，其中操作手柄11、12中集合有数据处理系统和输入输出设备，而头戴设备13与手柄11、12通过数据线连接。一体式头戴设备系统形式上可以参考头戴设备13，该系统的数据处理器设置在头戴设备13中。
头戴设备13的显示系统部分参考图1-2，其中，显示模组21承载在镜框131中，它包括背光模组211、显示屏212和透镜组213，显示屏212显示的图像通过透镜组213，在靠近透镜组213的佩戴者的眼睛中成像。背光模组211能提供充足的亮度与分布均匀的光源，使显示屏212能正常显示影像。
然而，由于头戴设备13需要像普通眼镜一样佩戴，这就要求镜框131尽可能轻薄，例如，利用申请号为US20170017078B的发明专利提供的透镜模组制造的头戴设备就是如此。如此轻薄的头戴设备13，其显示屏212到眼睛的距离更小，再由于头戴设备的显示屏212分别为左右眼提供图像，因此，由于这种特殊的结构，以及显示屏212的响应时间、视觉暂留、背光模组211的亮度等原因，在显示屏212显示的视频图像，会在佩戴者眼睛中形成拖影，进而影响佩戴者的体验效果。
发明内容
本申请提供了一种头戴设备背光装置控制方法及装置，以解决目前轻薄的头戴显示设备中显示的视频图像会在佩戴者眼睛中形成拖影，进而影响佩戴者的体验效果的问题。
本申请提供了一种头戴设备背光装置控制方法，用于包括背光电路和显示系统的头戴设备，包括：
获取显示系统的显示参数；
根据所述显示参数生成PWM信号的控制参数，将所述控制参数转化为控制信号，所述控制参数包括PWM脉冲序列的脉冲宽度和脉冲延迟时间；
根据显示系统的图像显示帧的同步信号和所述控制信号生成对应的PWM脉冲序列信号；
放大所述PWM脉冲序列信号，以及，输出所述放大后的PWM脉冲序列信号到背光电路，以使背光电路按照PWM脉冲序列信号的控制点亮或熄灭。
在一些实施例中，还包括：采集所述背光电路的电流信号，以及，根据所述电流信号放大所述PWM脉冲序列信号。
在一些实施例中，还包括：采集头戴设备输出的动作信号，将所述动作信号转换成动 作数据；以及，根据采集到的所述动作数据获得PWM信号控制参数。
在一些实施例中，所述动作数据包括重力加速度数据，以及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；
按照所述参数表在头戴设备中播放所述视频文件；以及，周期性地采集重力加速度数据，按照设定规则生成重力加速度数据编码；
判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据；
如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
在一些实施例中，所述动作数据包括角速度数据，以及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；
按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集角速度数据，按照设定规则生成角速度数据编码；
判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集角速度数据；
如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
在一些实施例中，所述动作数据包括方向数据，以及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；
按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集方向数据，按照设定规则生成角速度数据编码；
判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集方向数据；
如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
在一些实施例中，所述动作数据包括重力加速度数据和角速度数据，以及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；
按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集重力加速 度数据和角速度数据，按照设定规则生成角速度数据编码；
判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据和角速度数据；
如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
在一些实施例中，所述动作数据包括重力加速度数据和方向数据，以及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；
按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集重力加速度数据和方向数据，按照设定规则生成角速度数据编码；
判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据和方向数据；
如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
在一些实施例中，所述动作数据包括角速度数据和方向数据，以及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；
按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集角速度数据和方向数据，按照设定规则生成角速度数据编码；
判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集角速度数据和方向数据；
如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
在一些实施例中，所述动作数据包括重力加速度数据、角速度数据和方向数据，以及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；
按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集重力加速度数据、角速度数据和方向数据，按照设定规则生成角速度数据编码；
判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据、角速度数据和方向数据；
如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
本申请实施例还提供了一种头戴设备背光装置控制装置，所述装置包括：
显示参数获取模块，用于获取显示系统的显示参数；
控制信号生成模块，用于根据所述显示参数生成PWM信号的控制参数，将所述控制参数转化为控制信号，所述控制参数包括PWM脉冲序列的脉冲宽度和脉冲延迟时间；
脉冲信号生成模块，用于根据显示系统的图像显示帧的同步信号和所述控制信号生成对应的PWM脉冲序列信号；
脉冲信号放大模块，用于放大所述PWM脉冲序列信号，以及，输出所述放大后的PWM脉冲序列信号到背光电路，以使背光电路按照PWM脉冲序列信号的控制点亮或熄灭。
由以上技术方案可知，本申请提供的头戴设备背光装置控制方法及装置，可以获取显示系统的显示参数；根据显示参数生成PWM信号的控制参数，将控制参数转化为控制信号；根据显示系统的图像显示帧的同步信号和控制信号生成对应的PWM脉冲序列信号；放大PWM脉冲序列信号，以及，输出放大后的PWM脉冲序列信号到背光电路，以使背光电路按照PWM脉冲序列信号的控制点亮或熄灭。本申请的方案可以利用适合显示系统的占空比和适当的延时生成PWM脉冲序列信号，使得PWM脉冲序列信号能够不断地优化调整，进而更加精确地调整背光电路的点亮或者熄灭，进而解决显示系统中显示视频图像拖影的问题。
附图说明
为了更清楚地说明本申请的技术方案，下面将对实施案例中所需要使用的附图作简单地介绍，显而易见地，对于本领域普通技术人员而言，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1-1为现有技术中头戴设备的示意图；
图1-2为现有技术中头戴设备显示系统的示意图；
图2为本申请实施例中示出的一种头戴设备背光装置控制电路的结构图；
图3为本申请实施例中示出的另一种头戴设备背光装置控制电路的结构图；
图4为本申请实施例中示出的PWM信号发生器的电路原理图；
图5为本申请实施例中示出的一种PWM信号驱动器的电路图；
图6为本申请实施例中示出的另一种PWM信号驱动器的电路图。
具体实施方式
目前轻薄的头戴显示设备中显示的视频图像会在佩戴者眼睛中形成拖影，进而影响佩戴者的体验效果。基于这个问题，本申请实施例中提供了一种头戴设备背光装置控制方法及装置，利用适合显示系统的占空比和适当的延时生成PWM脉冲序列信号，使得PWM脉冲序列信号能够不断地优化调整，进而更加精确地调整背光电路的点亮或者熄灭，进而解决显示系统中显示视频图像等拖影的问题。
图2为本申请实施例中示出的一种头戴设备背光装置控制电路的结构图。本申请实施例提供的头戴设备背光装置控制方法基于图2所示的电路实现，图2中的电路具体包括：头戴设备13的背光电路2和显示系统3，还包括顺序连接的PWM信号参数处理器4、PWM信号发生器5、PWM信号驱动器6和亮度信号采集电路7。
本申请实施例中的头戴设备背光装置控制方法具体包括如下步骤：
步骤S101，获取显示系统3的显示参数。
步骤S102，根据所述显示参数生成PWM信号的控制参数，将所述控制参数转化为控制信号，所述控制参数包括PWM脉冲序列的脉冲宽度和脉冲延迟时间。
步骤S103，根据显示系统3的图像显示帧的同步信号和所述控制信号生成对应的PWM脉冲序列信号。
步骤S104，放大所述PWM脉冲序列信号，以及，输出所述放大后的PWM脉冲序列信号到背光电路2，以使背光电路2按照PWM脉冲序列信号的控制点亮或熄灭。
在上述实施例中，PWM信号参数处理器4可以获取显示系统3的显示参数，并且根据显示参数生成PWM信号的控制参数，再将所述控制参数转化为控制信号，将所述控制信号输出到PWM信号发生器5。
显示参数可以用来表示显示系统3上视频图像等显示效果的反馈数据，这些反馈数据可以根据大数据或者大样本测试获取，具体包括能够反应最佳显示效果的PWM脉冲序列的脉冲宽度(或占空比)和脉冲延迟时间，这些信号数据可以存储在处理器的存储器中或寄存器中，所述生成的意思就是从存储器中或寄存器中读出输出给PWM信号发生器5。而控制参数则包括获得的具体PWM脉冲序列的脉冲宽度和脉冲延迟时间。
所述PWM信号发生器5根据显示系统3的图像显示帧的同步信号和所述控制信号生成对应的PWM脉冲序列信号，以及，将所述PWM脉冲序列信号输出到PWM信号驱动器6。
显示参数中包括显示系统3上的图像显示帧数据，PWM信号参数处理器4可以根据图像显示帧确定出图像显示帧的同步信号的序列组成情况，例如序列高低电平的排布等等。再结合之前获取的控制参数等，可以分析确定出一个具有合适脉冲宽度(或占空比)和脉冲延迟时间的PWM脉冲序列信号。
由于图像每一个帧变换之时会出现短暂的拖影现象，因此需要在图像帧之间插入一个全黑帧以避免出现拖影问题。PWM信号参数处理器4就可以通过图像显示帧数据确定出相邻图像帧中间的时间间隙，并且生成一个控制信号，使控制信号可以指示背光电路在相邻图像帧的时间间隙出现时熄灭，进而实现在图像帧之间插入一个全黑帧的目的。而在图像帧正常显示的时候，背光电路应该点亮。
另外，本申请实施例中还通过PWM脉冲序列信号控制背光电路的点亮或熄灭，其中当PWM脉冲序列中出现高电平时可以指示背光电路点亮，当PWM脉冲序列中出现低电平时可以指示背光电路熄灭。
PWM(Pulse width modulation，脉冲宽度调制)是一种模拟控制方式，PWM的基本原理是对逆变电路开关器件的通断进行控制，使输出端得到一系列幅值相等的脉冲，用这些脉冲来代替正弦波或所需要的波形。在PWM脉冲序列中，各脉冲的幅值是相等的，要改变等效输出正弦波的幅值时，只要按同一比例系数改变各脉冲的宽度即可，因此在交－直－交变频器中，PWM逆变电路输出的脉冲电压就是直流侧电压的幅值。
所述PWM信号驱动器6放大所述PWM脉冲序列信号，以及，输出所述放大后的PWM脉冲序列信号到背光电路2，以使背光电路2按照PWM脉冲序列信号的控制点亮或熄灭。
另外，在一些实施例中，还可以采集所述背光电路2的电流信号，以及，根据所述电流信号放大所述PWM脉冲序列信号。具体的，图2中的所述亮度信号采集电路7可以采 集所述背光电路2的电流信号，以及，输出所述电流信号到所述PWM信号驱动器6，以控制所述PWM信号驱动器6放大所述PWM脉冲序列信号。
亮度信号采集的过程可以看作是一个反馈的过程，通过判断背光电路2的电流情况不断调整PWM脉冲序列信号的放大程度，使得图像的显示具有更好的亮度。
可见，上述实施例中的头戴设备背光装置控制方法可以利用适合显示系统的占空比和适当的延时生成PWM脉冲序列信号，以及结合背光电路2的电流控制更好地调整PWM脉冲序列的放大情况，使得PWM脉冲序列信号能够不断地优化调整，进而更加精确地调整背光电路2的点亮或者熄灭，进而解决显示系统3中显示视频图像拖影的问题。
在一些实施例中，上述方法还可以包括：采集头戴设备13输出的动作信号，将所述动作信号转换成动作数据；以及，根据采集到的所述动作数据获得PWM信号控制参数。图3为本申请实施例中示出的另一种头戴设备背光装置控制电路的结构图，如图3所示，上述实施例中的头戴设备背光装置控制电路中还可以包括与所述头戴设备13连接的传感器8和与所述传感器8连接的信号解析器9。其中，所述传感器8采集头戴设备13输出的动作信号，将所述动作信号输出到信号解析器9。所述信号解析器9将所述动作信号转换为动作数据，以及，将所述动作数据输出给PWM信号参数处理器4。PWM信号参数处理器4根据动作数据生成PWM信号的控制参数。
动作信号可以用于表示佩戴头戴设备的用户的头部动作的方向、动作的角度、动作的距离或者动作的速度等等。也可以理解为动作信号表示头戴设备的姿态，即重力的方向和旋转方向等等。本申请实施例中为了找到最佳的背光电路2的控制参数，需要通过检测用户的动作，用户在图像出现拖影问题时或者观感不佳时可以摆动头部进而改变头戴设备13的姿态，姿态的变化可以被传感器8检测到，进而通过一系列的计算，可以知道当前的图像质量是否合乎要求。
在一些实施例中，所述传感器8可以是加速度传感器；所述加速度传感器采集头戴设备13输出的重力加速度信号，以及，将所述重力加速度信号输出到信号解析器9。
此时，动作数据包括重力加速度数据，以及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
步骤S201，选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路2点亮或熄灭的控制参数。
在本申请实施例中，视频文件的一些图像数据可以作为上述实施例中的显示参数，PWM信号参数处理器4在获得图像数据之后，可以分析出一系列可选的控制参数，但是当前还无法确定哪个控制参数可以使图像最佳的显示出来，因此，还需要结合重力加速度数据进行进一步的筛选。
步骤S202，按照所述参数表在头戴设备13中播放所述视频文件；以及，周期性地采集重力加速度数据，按照设定规则生成重力加速度数据编码。
由于参数表中有一系列的控制参数，为了筛选，还需要针对每个控制参数进行测试，即按照各个控制参数中的PWM脉宽和脉冲延迟时间分别播放视频文件。在播放视频文件的同时，还需要采集重力加速度数据，因为用户在观看视频时，可以通过摆头等动作反馈出观看的图像质量是否符合要求，是否存在拖影等问题。用户在反馈时可以产生重力加速度数据，PWM信号参数处理器4可以通过分析这些数据进而分析出用户对图像质量是否 满意。
步骤S203，判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据。
PWM信号参数处理器4可以按照其预先设定的转换规则，根据重力加速度数据生成重力加速度数据编码，再根据预设满意姿态对应的编码等对照重力加速度数据编码进行判断，如果与预设满意姿态对应的编码相同或者相近，就可以将重力加速度数据编码看做是合格得到编码。
步骤S204，如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备13中按照播放所述视频文件或退出。
最后，再将最佳图像对应的控制参数确定为播放该视频文件的最佳参数，此后再播放该视频文件，则可以直接按照这个控制参数播放，避免出现图像拖影的问题。
在一些实施例中，所述传感器8还可以是陀螺仪传感器、地磁传感器或者包括上述加速度传感器在内的任两个传感器的组合或者三个传感器的组合；所述陀螺仪传感器采集头戴设备13输出的角速度信号，所述地磁传感器采集头戴设备13输出的方向信号。陀螺仪传感器和地磁传感器与上述加速度传感器的作用相同。
当传感器8是陀螺仪传感器时，动作数据包括角速度数据。并且在上述步骤S102中需要周期性地采集角速度数据，按照设定规则生成角速度数据编码。在上述步骤S103中，如果所述编码不是合格的数据编码，继续周期性地采集角速度数据。
当传感器8是地磁传感器时，动作数据包括方向数据。并且在上述步骤S102中需要周期性地采集方向数据，按照设定规则生成方向数据编码。在上述步骤S103中，如果所述编码不是合格的数据编码，继续周期性地采集方向数据。
当传感器8是加速度传感器和陀螺仪传感器时，动作数据包括重力加速度数据和角速度数据。并且在上述步骤S102中需要周期性地采集重力加速度数据和角速度数据，按照设定规则生成角速度数据编码。在上述步骤S103中，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据和角速度数据。
当传感器8是加速度传感器和地磁传感器时，动作数据包括重力加速度数据和方向数据。并且在上述步骤S102中需要周期性地采集重力加速度数据和方向数据，按照设定规则生成角速度数据编码。在上述步骤S103中，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据和方向数据。
当传感器8是陀螺仪传感器和地磁传感器时，动作数据包括角速度数据和方向数据。并且在上述步骤S102中需要周期性地采集角速度数据和方向数据，按照设定规则生成角速度数据编码。在上述步骤S103中，如果所述编码不是合格的数据编码，继续周期性地采集角速度数据和方向数据。
当传感器8是加速度传感器、陀螺仪传感器和地磁传感器时，动作数据包括重力加速度数据、角速度数据和方向数据。并且在上述步骤S102中需要周期性地采集重力加速度数据、角速度数据和方向数据，按照设定规则生成角速度数据编码。在上述步骤S103中，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据、角速度数据和方向数据。
图4为本申请实施例中示出的PWM信号发生器的电路原理图。如图4所示，本申请实施例中的PWM信号发生器5包括加法器61和与所述加法器61连接的PWM发生器62。其中，所述加法器61，根据所述控制信号b和图像显示帧的同步信号a生成PWM序列，输出PWM序列到所述PWM发生器62；图4中的c表示脉冲延迟时间。
所述PWM发生器62，根据所述PWM序列，输出所述放大后的PWM脉冲序列信号到背光电路2，以使背光电路2按照PWM脉冲序列信号的控制点亮或熄灭。
图5为本申请实施例中示出中一种PWM信号驱动器的电路图。如图5所示，PWM信号驱动器6可以包括：驱动芯片71、电感L 172、电容C IN73、电容C OUT74、二极管D 175和电阻R 176。
所述驱动芯片71的第六引脚连接有直流电源，所述驱动芯片71的第六引脚还连接电感L 172的第一端和所述驱动芯片71的第四引脚；所述驱动芯片71的第一引脚连接电感L 172的第二端；所述驱动芯片71的第三引脚连接可变电阻R 176的第一端，电阻R 176的第二端接地。
电感L 172的第二端还连接二极管D 175的正极，二极管D 175的负极连接所述背光电路2的输入端；所述背光电路2的输出端连接电阻R 1(76)的第一端。
所述电容C IN73的正极连接所述驱动芯片71的第六引脚，电容C IN73的负极接地；电容C OUT74的正极连接二极管D 175的负极，电容C OUT74的负极接地。
图6为本申请实施例中示出的另一种PWM信号驱动器的电路图。如图6所示，PWM信号驱动器6还可以包括：驱动芯片71、电感L 172、电容C IN73、电容C OUT74、二极管D 175和电阻R 176、电阻R 277、电阻R 378。
所述驱动芯片71的第六引脚连接有直流电源，所述驱动芯片71的第六引脚还连接电感L 172的第一端和所述驱动芯片71的第四引脚；所述驱动芯片71的第一引脚连接电感L 172的第二端；所述驱动芯片71的第三引脚连接电阻R 277的第一端，电阻R 277的第二端接地。
电阻R 277的第一端还连接电阻R 378的第二端，电阻R 378的第一端连接二极管D 175的负极。
电感L 172的第二端还连接二极管D 175的正极，二极管D 175的负极连接所述背光电路2的输入端；所述背光电路2的输出端连接电阻R 176的第一端；电阻R 176的第二端接地。
所述电容C IN73的正极连接所述驱动芯片71的第六引脚，电容C IN73的负极接地；电容C OUT74的正极连接二极管D 175的负极，电容C OUT74的负极接地。
其中，上述实施例中的所述驱动芯片71可以采用AP3127B驱动芯片。AP3127B驱动芯片是一款固定振荡频率、恒流输出的升压型DC/DC转换器，非常适合于移动电话、数码相机等电子产品的背光驱动。输出电压可达16V，3.2V输出电压可以驱动四个串联LED，2.5V输入电压可以驱动两路并联LED(每路串联三个LED)。通过改变CE脚上PWM信号的占空比可以控制LED的亮度。另外内部集成了一个导通电阻为0.8Ω的场效应管，外部可使用微型电感和电容，以缩小印制板面积。
另外，本申请实施例还提供了一种头戴设备背光装置控制装置，包括：显示参数获取模块，用于获取显示系统的显示参数；控制信号生成模块，用于根据所述显示参数生成 PWM信号的控制参数，将所述控制参数转化为控制信号，所述控制参数包括PWM脉冲序列的脉冲宽度和脉冲延迟时间；脉冲信号生成模块，用于根据显示系统的图像显示帧的同步信号和所述控制信号生成对应的PWM脉冲序列信号；脉冲信号放大模块，用于放大所述PWM脉冲序列信号，以及，输出所述放大后的PWM脉冲序列信号到背光电路，以使背光电路按照PWM脉冲序列信号的控制点亮或熄灭。
其中，脉冲信号放大模块还用于采集所述背光电路的电流信号，以及，根据所述电流信号放大所述PWM脉冲序列信号。
控制信号生成模块还用于采集头戴设备输出的动作信号，将所述动作信号转换成动作数据；以及，根据采集到的所述动作数据获得PWM信号控制参数。
控制信号生成模块还用于按照下述步骤根据所述动作数据获得PWM信号控制参数：选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；按照所述参数表在头戴设备中播放所述视频文件；以及，周期性地采集重力加速度数据，按照设定规则生成重力加速度数据编码；判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据；如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
控制信号生成模块还用于按照下述步骤根据所述动作数据获得PWM信号控制参数：选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集角速度数据，按照设定规则生成角速度数据编码；判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集角速度数据；如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
控制信号生成模块还用于按照下述步骤根据所述动作数据获得PWM信号控制参数：选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集方向数据，按照设定规则生成角速度数据编码；判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集方向数据；如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
控制信号生成模块还用于按照下述步骤根据所述动作数据获得PWM信号控制参数：选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集重力加速度数据和角速度数据，按照设定规则生成角速度数据编码；判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据和角速度数据；如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的 图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
控制信号生成模块还用于按照下述步骤根据所述动作数据获得PWM信号控制参数：选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集重力加速度数据和方向数据，按照设定规则生成角速度数据编码；判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据和方向数据；如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
控制信号生成模块还用于按照下述步骤根据所述动作数据获得PWM信号控制参数：选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集角速度数据和方向数据，按照设定规则生成角速度数据编码；判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集角速度数据和方向数据；如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
控制信号生成模块还用于按照下述步骤根据所述动作数据获得PWM信号控制参数：选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集重力加速度数据、角速度数据和方向数据，按照设定规则生成角速度数据编码；判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据、角速度数据和方向数据；如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
本领域技术人员在考虑说明书及实践这里公开的申请后，将容易想到本申请的其它实施方案。本申请旨在涵盖本申请的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本申请的一般性原理并包括本申请未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本申请的真正范围由权利要求指出。
应当理解的是，本申请并不局限于上面已经描述并在附图中示出的精确结构，并且可以在不脱离其范围进行各种修改和改变。以上所述的本发明实施方式并不构成对本发明保护范围的限定。

Claims (11)

  1. 一种头戴设备背光装置控制方法，用于包括背光电路和显示系统的头戴设备，其特征在于，包括：
    获取显示系统的显示参数；
    根据所述显示参数生成PWM信号的控制参数，将所述控制参数转化为控制信号，所述控制参数包括PWM脉冲序列的脉冲宽度和脉冲延迟时间；
    根据显示系统的图像显示帧的同步信号和所述控制信号生成对应的PWM脉冲序列信号；
    放大所述PWM脉冲序列信号，以及，输出所述放大后的PWM脉冲序列信号到背光电路，以使背光电路按照PWM脉冲序列信号的控制点亮或熄灭。
  2. 根据权利要求1所述的控制方法，其特征在于，还包括：
    采集所述背光电路的电流信号，以及，根据所述电流信号放大所述PWM脉冲序列信号。
  3. 根据权利要求1所述的控制方法，其特征在于，还包括：
    采集头戴设备输出的动作信号，将所述动作信号转换成动作数据；以及，根据采集到的所述动作数据获得PWM信号控制参数。
  4. 根据权利要求3所述的控制方法，其特征在于，所述动作数据包括重力加速度数据，以及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
    选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；
    按照所述参数表在头戴设备中播放所述视频文件；以及，周期性地采集重力加速度数据，按照设定规则生成重力加速度数据编码；
    判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据；
    如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
  5. 根据权利要求3所述的控制方法，其特征在于，所述动作数据包括角速度数据，以及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
    选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；
    按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集角速度数据，按照设定规则生成角速度数据编码；
    判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集角速度数据；
    如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
  6. 根据权利要求3所述的控制方法，其特征在于，所述动作数据包括方向数据，以 及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
    选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；
    按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集方向数据，按照设定规则生成角速度数据编码；
    判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集方向数据；
    如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
  7. 根据权利要求3所述的控制方法，其特征在于，所述动作数据包括重力加速度数据和角速度数据，以及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
    选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；
    按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集重力加速度数据和角速度数据，按照设定规则生成角速度数据编码；
    判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据和角速度数据；
    如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
  8. 根据权利要求3所述的控制方法，其特征在于，所述动作数据包括重力加速度数据和方向数据，以及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
    选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；
    按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集重力加速度数据和方向数据，按照设定规则生成角速度数据编码；
    判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据和方向数据；
    如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
  9. 根据权利要求3所述的控制方法，其特征在于，所述动作数据包括角速度数据和方向数据，以及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
    选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；
    按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集角速度数据和方向数据，按照设定规则生成角速度数据编码；
    判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期 性地采集角速度数据和方向数据；
    如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
  10. 根据权利要求3所述的控制方法，其特征在于，所述动作数据包括重力加速度数据、角速度数据和方向数据，以及，按照下述步骤根据所述动作数据获得PWM信号控制参数：
    选择视频文件，设置图像播放的PWM参数表，所述参数表包括控制所述背光电路点亮或熄灭的控制参数；
    按照所述参数表在头戴设备中按照播放所述视频文件；以及，周期性地采集重力加速度数据、角速度数据和方向数据，按照设定规则生成角速度数据编码；
    判断所述编码是否是合格的数据编码，如果所述编码不是合格的数据编码，继续周期性地采集重力加速度数据、角速度数据和方向数据；
    如果所述编码是合格的数据编码，通过所述数据编码判断当前播放的图像是否最佳图像，如果是最佳图像，获得所述最佳图像对应的控制参数；如果不是最佳图像，继续按照所述参数表在头戴设备中按照播放所述视频文件或退出。
  11. 一种头戴设备背光装置控制装置，其特征在于，所述装置包括：
    显示参数获取模块，用于获取显示系统的显示参数；
    控制信号生成模块，用于根据所述显示参数生成PWM信号的控制参数，将所述控制参数转化为控制信号，所述控制参数包括PWM脉冲序列的脉冲宽度和脉冲延迟时间；
    脉冲信号生成模块，用于根据显示系统的图像显示帧的同步信号和所述控制信号生成对应的PWM脉冲序列信号；
    脉冲信号放大模块，用于放大所述PWM脉冲序列信号，以及，输出所述放大后的PWM脉冲序列信号到背光电路，以使背光电路按照PWM脉冲序列信号的控制点亮或熄灭。
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