WO2022041074A1

WO2022041074A1 - Backlight apparatus control system for head-mounted device, and terminal

Info

Publication number: WO2022041074A1
Application number: PCT/CN2020/111897
Authority: WO
Inventors: 李桂玉
Original assignee: 南京英维尔科技服务有限公司
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2022-03-03
Also published as: JP2022543719A

Abstract

Disclosed in the present application are a backlight apparatus control system for a head-mounted device, and a terminal. According to the disclosure, a display parameter of a display system can be acquired; a control parameter of a PWM signal is generated according to the display parameter, and the control parameter is converted into a control signal; according to a synchronization signal of an image display frame of the display system and the control signal, a corresponding PWM pulse sequence signal is generated; and the PWM pulse sequence signal is amplified, and the amplified PWM pulse sequence signal is output to a backlight circuit such that the backlight circuit is turned on or off according to the control of the PWM pulse sequence signal. According to the solution of the present application, a PWM pulse sequence signal can be generated by using a duty cycle suitable for a display system and a suitable delay such that the PWM pulse sequence signal can be continuously optimized and adjusted, so as to more accurately adjust the turning on or off of a backlight circuit, thereby solving the problem of smearing of a video image displayed in the display system.

Description

A head-mounted device backlight device control system and terminal

technical field

The present application relates to the field of optical technology, and in particular, to a control system and a terminal for a backlight device of a head-mounted device.

Background technique

A headset is a human-computer interaction device. Commonly used head-mounted device systems include two types: external and integrated. Among them, 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 close to the lens group 213. The backlight module 211 can provide sufficient brightness and a uniformly distributed light source, so that the display screen 212 can display images normally.

However, since the head-mounted device 13 needs to be worn like ordinary glasses, the frame 131 is required to be as thin and light as possible. With such a thin and light head-mounted device 13, 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.

SUMMARY OF THE INVENTION

The present application provides a head-mounted device backlight device control system and terminal 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 application provides a head-mounted device backlight device control system, including a backlight circuit and a display system of the head-mounted device, and also includes a PWM signal parameter processor, a PWM signal generator, a PWM signal driver and a brightness signal acquisition circuit connected in sequence; in:

The PWM signal parameter processor is used to generate control parameters of the PWM signal according to the display parameters of the display system, the control parameters include the pulse width and pulse delay time of the PWM pulse sequence, and convert the control parameters into a control signal Output to PWM signal generator;

The PWM signal generator is used 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, and output the PWM pulse sequence signal to the PWM signal driver;

The PWM signal driver 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 is turned on or off according to the control of the PWM pulse sequence signal;

The brightness signal collection circuit is used for collecting the current signal of the backlight circuit, and outputting the current signal to the PWM signal driver, so as to control the PWM signal driver to amplify the PWM pulse sequence signal.

In some embodiments, a sensor connected to the headset and a signal parser connected to the sensor are also included, wherein:

The sensor is used to collect the action signal output by the head-mounted device, and output the action signal to the signal parser;

The signal parser is used for converting the motion signal into motion data, and outputting the motion data to the PWM signal parameter processor.

In some embodiments, the PWM signal generator includes an adder and a PWM generator connected to the adder, wherein:

The adder is used to generate a PWM sequence according to the control signal and the synchronization signal of the image display frame, and output the PWM sequence to the PWM generator;

The PWM transmitter is configured to output the amplified PWM pulse sequence signal to the backlight circuit according to the PWM sequence, so that the backlight circuit can be turned on or off according to the control of the PWM pulse sequence signal.

In some embodiments, the PWM signal driver includes: a driver chip, an inductor L ₁ , a capacitor C _IN , a capacitor C _OUT , a diode D ₁ and a resistor R ₁ ;

The sixth pin of the driver chip is connected with a DC power supply, and the sixth pin of the driver chip is also connected to the _first end of the inductor L1 and the fourth pin of the driver chip; the first pin of the driver chip The pin is connected to the second end of the inductor L1 _; the third pin of the driving chip is connected to the _first end of the variable resistor R1, and the second end _of the resistor R1 is grounded;

_The second end of the inductor L1 is also connected to the anode _of the diode D1, and the cathode _of the diode D1 is connected to the input end of the backlight circuit; the output end of the backlight circuit is connected to the _first end of the resistor R1;

The anode of the capacitor C _IN is connected to the sixth pin of the driving chip, the cathode of the capacitor C _IN is grounded; the anode of the capacitor C _OUT is connected to the cathode of the diode D ₁ , and the cathode of the capacitor C _OUT is grounded;

Among them, the driver chip adopts AP3127B driver chip.

In some embodiments, the PWM signal driver includes: a driver chip, an inductor L ₁ , a capacitor C _IN , a capacitor C _OUT , a diode D ₁ , a resistor R ₁ , a resistor R ₂ , and a resistor R ₃ ;

The sixth pin of the driver chip is connected with a DC power supply, and the sixth pin of the driver chip is also connected to the _first end of the inductor L1 and the fourth pin of the driver chip; the first pin of the driver chip The pin is connected to the _second end of the inductor L1 _; the third pin of the driving chip is connected to the first end of the resistor R2, and the _second end of the resistor R2 is grounded;

The first end of the resistor R2 is also connected to the _second end of the resistor _R3 , and the _first end of the resistor _R3 is connected to the cathode of the diode D1;

_The second end of the inductor L1 is also connected to the anode _of the diode D1, and the cathode _of the diode D1 is connected to the input end of the backlight circuit; the output end of the backlight circuit is connected to the first end of the resistor R1 _; the _first end of the resistor R1 is connected. Both ends are grounded;

Among them, the driver chip adopts AP3127B driver chip.

In some embodiments, the sensor includes an acceleration sensor, a gyroscope sensor and/or a geomagnetic sensor.

In some embodiments, the acceleration sensor is used to collect the gravitational acceleration signal output by the head-mounted device, and output the gravitational acceleration signal to a signal parser.

In some embodiments, the gyroscope sensor is used to collect the angular velocity signal output by the head-mounted device, and output the angular velocity signal to a signal parser.

In some embodiments, the geomagnetic sensor is used to collect the direction signal output by the head-mounted device, and output the direction signal to a signal parser.

The present application also provides a head-mounted device backlight control terminal, the terminal includes a processor, and a memory for storing executable instructions of the processor; wherein the processor is configured to:

Generate the control parameters of the PWM signal according to the display parameters of the display system, the control parameters include the pulse width and the pulse delay time of the PWM pulse sequence, and, the control parameters are converted into control signals and output to the PWM signal generator;

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, and output the PWM pulse sequence signal to the PWM signal driver;

Amplifying the PWM pulse sequence signal, and outputting the amplified PWM pulse sequence signal to the backlight circuit, so that the backlight circuit is turned on or off according to the control of the PWM pulse sequence signal;

Collecting the current signal of the backlight circuit, and outputting the current signal to the PWM signal driver, so as to control the PWM signal driver to amplify the PWM pulse sequence signal.

It can be seen from the above technical solutions that the head-mounted device backlight device control system and terminal provided by the present application 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 the control signal of the image display frame generate the 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 lights up 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.

Description of drawings

In order to illustrate the technical solutions of the present application more clearly, the following will briefly introduce the accompanying drawings that need to be used in the implementation cases. Other drawings can also be obtained from these drawings.

1-1 is a schematic diagram of a head-mounted device in the prior art;

1-2 are schematic diagrams of a head-mounted device display system in the prior art;

2 is a structural diagram of a head mounted device backlight device control system shown in an embodiment of the application;

3 is a structural diagram of another head-mounted device backlight device control system 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;

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.

detailed description

At present, 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. Based on this problem, an embodiment of the present application provides a head-mounted device backlight device control system and terminal, which utilizes a duty cycle suitable for the display system and an appropriate delay to generate a PWM pulse sequence signal, and combines the current control of the backlight circuit to control the system. The amplification of the PWM pulse sequence can be adjusted well, 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 smearing such as video images displayed in the display system.

FIG. 2 is a structural diagram of a control system for a backlight device of a head mounted device shown in an embodiment of the application. As shown in FIG. 2 , the system includes: a backlight circuit 2 and a display system 3 of a head mounted device 13 , and also includes a PWM signal parameter processor 4 , a PWM signal generator 5 , a PWM signal driver 6 and a brightness signal acquisition circuit that are connected in sequence 7.

Wherein, the PWM signal parameter processor 4 can acquire the display parameters of the display system 3, and generate the control parameters of the PWM signal according to the display parameters, then convert the control parameters into control signals, and output the control signals to the PWM signals Generator 5.

The display parameters can be used to represent the feedback data of the display effects 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.

Since a brief smear phenomenon occurs when each frame of the image is transformed, it is necessary to insert a completely black frame between the image frames to avoid the smear problem. 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. When the image frame is displayed normally, the backlight circuit should be lit.

In addition, in the embodiment of the present application, 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) is an analog control method. 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. In the PWM pulse sequence, the amplitude of each pulse is equal. To change the amplitude of the equivalent output sine wave, it is only necessary to change the width of each pulse according to the same proportional coefficient. Therefore, in the AC-DC-AC inverter , 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 brightness signal collection circuit 7 collects the current signal of the backlight circuit 2, and outputs the current signal to the PWM signal driver 6 to control the PWM signal driver 6 to amplify the PWM pulse sequence signal.

The process of collecting the brightness signal can be regarded as a feedback process. By judging the current condition of the backlight circuit 2, the amplification degree of the PWM pulse sequence signal is continuously adjusted, so that the image display has better brightness.

It can be seen that the head-mounted device backlight device control system in the above embodiment can generate a PWM pulse sequence signal with 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. Amplifying the situation, 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 .

FIG. 3 is a structural diagram of another head-mounted device backlight device control system shown in an embodiment of the application. As shown in FIG. 3 , the above system may further include a sensor 8 connected to the head mounted device 13 and a 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 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. It can also be understood that the action signal represents the posture of the headset, that is, the direction of gravity and the direction of rotation, and so on. In order to find the best control parameters of the backlight circuit 2 in the embodiment of the present application, 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.

In some embodiments, the sensor 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 .

At this time, the motion data includes gravity acceleration data, and the PWM signal parameter processor 4 needs to perform the following processing to obtain control parameters:

In step S101, a video file is selected, and a PWM parameter table for image playback is set, and the parameter table includes control parameters for controlling the backlight circuit 2 to be turned on or off.

In the embodiment of the present application, some image data of the video file can be used as the display parameters in the above-mentioned embodiment. After obtaining the image data, 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 S102 , playing the video file in the head mounted device 13 according to the parameter table; and collecting gravitational acceleration data periodically, and generating gravitational acceleration data codes according to a set rule.

Since there are a series of control parameters in the parameter table, in order to filter, it is necessary to test each control parameter, that is, to play video files according to the PWM pulse width and pulse delay time in each control parameter. While playing the video file, it is also necessary to collect the gravitational acceleration data, because when the user is watching the video, the user can feedback whether the quality of the viewed image meets the requirements and whether there are problems such as smearing through actions such as shaking the head. The user can generate gravitational acceleration data during feedback, and the PWM signal parameter processor 4 can analyze whether the user is satisfied with the image quality by analyzing these data.

Step S103, judge 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 S104, 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 not the best image , continue to play the video file or exit in the head mounted device 13 according to the parameter table.

Finally, the 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.

In some embodiments, 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.

When the sensor 8 is a gyro sensor, the motion data includes angular velocity data. And in the above-mentioned step S102, the angular velocity data needs to be collected periodically, and the angular velocity data code is generated according to the set rule. In the above step S103, if the code is not a qualified data code, continue to collect angular velocity data periodically.

When the sensor 8 is a geomagnetic sensor, the motion data includes direction data. And in the above step S102, the direction data needs to be collected periodically, and the direction data code is generated according to the set rule. In the above step S103, if the code is not a qualified data code, continue to collect direction data periodically.

When the sensor 8 is an acceleration sensor and a gyro sensor, the motion data includes gravitational acceleration data and angular velocity data. And in the above step S102, it is necessary to periodically collect the gravitational acceleration data and the angular velocity 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 angular velocity data.

When the sensor 8 is an acceleration sensor and a geomagnetic sensor, 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.

When the sensor 8 is a gyro sensor and a geomagnetic sensor, the motion data includes angular velocity data and direction data. In addition, in the above step S102, it is necessary to periodically collect the angular velocity 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 angular velocity data and direction data.

When the sensor 8 is an acceleration sensor, a gyro sensor, and a geomagnetic sensor, the motion data includes gravitational acceleration data, angular velocity data, and orientation data. And in the above step S102, it is necessary to periodically collect the gravitational acceleration data, the angular velocity 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, 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. As shown in FIG. 4 , 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 an embodiment of the application. As shown in FIG. 5 , 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 driver chip 71 is connected to a DC power supply, and the sixth pin of the driver chip 71 is also connected to the _first end of the inductor L172 and the fourth pin of the driver chip 71; the driver 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. As shown in FIG. 6 , 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 driver chip 71 is connected to a DC power supply, and the sixth pin of the driver chip 71 is also connected to the _first end of the inductor L172 and the fourth pin of the driver chip 71; the driver 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 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 _; The second terminal of resistor R1 76 is grounded.

Wherein, 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, and 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. In addition, a field effect transistor with an on-resistance of 0.8Ω is integrated inside, and miniature inductors and capacitors can be used externally to reduce the area of the printed board.

Embodiments of the present application further provide a head-mounted device backlight control terminal, where the terminal includes a processor, and a memory for storing executable instructions of the processor;

wherein the processor is configured to:

The control parameters of the PWM signal are generated according to the display parameters of the display system 3, the control parameters include the pulse width and the pulse delay time of the PWM pulse sequence, and the control parameters are converted into control signals and output to the PWM signal generator 5.

A corresponding PWM pulse sequence signal is generated according to the synchronization signal of the image display frame of the display system 3 and the control signal, and the PWM pulse sequence signal is output to the PWM signal driver 6 .

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.

Collect the current signal of the backlight circuit 2, and output the current signal to the PWM signal driver 6 to control the PWM signal driver 6 to amplify the PWM pulse sequence signal.

The processor is further configured to: collect the motion signal output by the head mounted device 13; and convert the motion signal into motion data.

The processor is further configured to: generate a PWM sequence according to the control signal and the synchronization signal of the image display frame; and according to the amplified PWM sequence, to turn on or off the backlight circuit 2 according to the PWM pulse sequence signal.

Other embodiments of the present application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses or adaptations of this application that follow the general principles of this application and include common knowledge or conventional techniques in the technical field not disclosed in this application . The specification and examples are to be regarded as exemplary only, with the true scope of the application being indicated by the claims.

It is to be understood that the present application is not limited to the precise structures described above and illustrated in the accompanying drawings and that various modifications and changes may be made without departing from the scope thereof. The embodiments of the present invention described above do not limit the protection scope of the present invention.

Claims

A head-mounted device backlight device control system, comprising a backlight circuit (2) of a head-mounted device (13) and a display system (3), characterized in that it further comprises a PWM signal parameter processor (4), a PWM signal A generator (5), a PWM signal driver (6) and a brightness signal acquisition circuit (7); wherein:

The PWM signal parameter processor (4) is used to generate control parameters of the PWM signal according to the display parameters of the display system (3), the control parameters include the pulse width and the pulse delay time of the PWM pulse sequence, and, The control parameters are converted into control signals and output to the PWM signal generator (5);

The PWM signal generator (5) is used to generate 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 output the PWM pulse sequence signal to the PWM signal driver(6);

The PWM signal driver (6) is configured to 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) follows the PWM pulse sequence signal the control to turn on or off;

The brightness signal acquisition circuit (7) is configured to acquire the current signal of the backlight circuit (2), and output the current signal to the PWM signal driver (6) to control the PWM signal driver (6) ) amplifies the PWM pulse train signal.
The control system according to claim 1, characterized in that it further comprises a sensor (8) connected to the head mounted device (13) and a signal parser (9) connected to the sensor (8), wherein:

the sensor (8) is used for collecting the action signal output by the head mounted device (13), and outputting the action signal to the signal parser (9);

The signal parser (9) is used for converting the motion signal into motion data, and outputting the motion data to a PWM signal parameter processor (4).
The control system according to claim 2, wherein the PWM signal generator (5) comprises an adder (61) and a PWM generator (62) connected to the adder (61), wherein:

the adder (61), for generating a PWM sequence according to the control signal and the synchronization signal of the image display frame, and outputting the PWM sequence to the PWM generator (62);

The PWM transmitter (62) is configured to output the amplified PWM pulse sequence signal to the backlight circuit (2) according to the PWM sequence, so that the backlight circuit (2) lights up according to the control of the PWM pulse sequence signal or off.
The control system according to claim 3, wherein the PWM signal driver (6) comprises: 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 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 L1 (72) and the first end of the driving chip (71). the fourth pin; the first pin of the driving 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 variable resistor R 1 (76) The first 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 of the backlight circuit (2) The terminal is connected to the first terminal of the resistor R1 (76);

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 diode D 1 (75) Negative, the negative of capacitor C OUT (74) is grounded;

Wherein, the driver chip (71) adopts an AP3127B driver chip.
The control system according to claim 3, wherein the PWM signal driver (6) comprises: a driving chip (71), an inductor L 1 (72), a capacitor C IN (73), a capacitor C OUT (74), a diode D1 ( 75) and resistor R1 ( 76), resistor R2 ( 77), resistor R3 (78);

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 L1 (72) and the first end of the driving chip (71). the fourth pin; the first pin of the driver chip (71) is connected to the second end of the inductor L 1 (72); the third pin of the driver chip (71) is connected to the first pin of the resistor R 2 (77) One end, 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 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 of the backlight circuit (2) The terminal is connected to the first terminal of the resistor R1 (76) ; the second terminal of the 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 diode D 1 (75) Negative, the negative of capacitor C OUT (74) is grounded;

Wherein, the driver chip (71) adopts an AP3127B driver chip.
The control system according to claim 2, wherein the sensor (8) comprises an acceleration sensor, a gyroscope sensor and/or a geomagnetic sensor.
The control system according to claim 6, characterized in that the acceleration sensor is used to collect the gravitational acceleration signal output by the head mounted device (13), and output the gravitational acceleration signal to a signal parser (9).
The control system according to claim 6, characterized in that the gyro sensor is used to collect the angular velocity signal output by the head mounted device (13), and output the angular velocity signal to a signal parser (9).
The control system according to claim 6, characterized in that the geomagnetic sensor is used to collect the direction signal output by the head mounted device (13), and output the direction signal to the signal analyzer (9).
A head-mounted device backlight control terminal, characterized in that the terminal includes a processor and a memory for storing executable instructions of the processor;

wherein the processor is configured to:

According to the display parameters of the display system (3), the control parameters of the PWM signal are generated, the control parameters include the pulse width and the pulse delay time of the PWM pulse sequence, and the control parameters are converted into control signals and output to the PWM signal generator ( 5);

Generate 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 output the PWM pulse sequence signal to a PWM signal driver (6);

Amplifying the PWM pulse sequence signal, and outputting 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;

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 the PWM pulse sequence signal.