JP2022543719A - Backlight device control system and terminal for head-mounted equipment - Google Patents

Abstract

A backlight device control system and a terminal for a head-mounted device according to the present application acquire display parameters of a display system, generate control parameters of a PWM signal based on the display parameters, convert the control parameters into control signals, By generating a corresponding PWM pulse sequence signal based on the synchronization signal and control signal of the image display frame of the display system, amplifying the PWM pulse sequence signal, and outputting the amplified PWM pulse sequence signal to the backlight circuit , the backlight circuit is turned on or off based on the control by the PWM pulse sequence signal. The present application generates a PWM pulse sequence signal using a duty ratio and an appropriate delay time suitable for the display system, and continuously optimizes and adjusts the PWM pulse sequence signal to more accurately turn on or off the backlight circuit. to solve the problem of ghosting in the video image displayed on the display system.

Description

TECHNICAL FIELD The present application relates to the field of optical technology, and more particularly to a backlight device control system and terminal for head-mounted equipment.

Head-mounted devices are human-machine interaction devices. Ordinary head-mounted equipment systems come in two types: an external connection type and an integrated type. A computer host and input/output devices are provided, and the integrated head-mounted device system does not have any input/output devices, and the data processor is also provided on the head-mounted device. FIG. 1-1 shows an externally connected head-mounted device system having an operating handle, in which a data processing system and input/output devices are integrated, and a head-mounted device 13 and handles 11 and 12 are connected via data lines. The integrated head-mounted device system may refer to the head-mounted device 13 and the data processor of the system is provided in the head-mounted device 13 .

The display system portion of the head-mounted device 13 is shown in FIGS. 1-2, wherein the display module 21 comprising a backlight module 211, a display screen 212 and a lens group 213 is carried in a spectacle frame 131 to display the display screen. The image displayed by 212 is focused through lens group 213 into the eye of the wearer who approaches lens group 213 . The backlight module 211 provides a light source with sufficient brightness and uniform distribution so that the display screen 212 can display an image normally.

However, since the head-mounted device 13 needs to be worn like normal eyeglasses, for example, the head-mounted device manufactured using the lens module according to the patent application whose application number is US20170017078B. In addition, the eyeglass frame 131 is required to be as light and thin as possible. Such a lightweight and thin head-mounted device 13 has a smaller distance from its display screen 212 to the eyes, and furthermore, because the display screen 212 of the head-mounted device provides images to the left and right eyes respectively, Due to such special structure and the response time of the display screen 212, visual persistence, brightness of the backlight module 211, etc., the video image displayed on the display screen 212 may cause ghosting in the eyes of the wearer. , will affect the experience effect of the wearer.

In order to solve the problem that video images currently displayed on light and thin head-mounted devices form ghosts in the wearer's eyes, thereby affecting the experience effect of the wearer, the present application provides a head-mounted device. A backlight device control system and terminal for a body-worn device are provided.

A backlight device control system for a head-mounted device according to the present application includes a PWM signal parameter processor, a PWM signal generator, a PWM signal driver, and a luminance signal acquisition circuit;
The PWM signal parameter processor generates control parameters of a PWM signal, including a pulse width and a pulse delay time of a PWM pulse sequence, based on display parameters of a display system, converts the control parameters into a control signal to generate a PWM signal used to output to the 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. be
The PWM signal driver amplifies the PWM pulse sequence signal and outputs the amplified PWM pulse sequence signal to the backlight circuit, thereby turning on or off the backlight circuit based on control by the PWM pulse sequence signal. used for
The luminance signal acquisition circuit acquires a current signal of the backlight circuit and outputs the current signal to the PWM signal driver, thereby controlling the PWM signal driver to amplify the PWM pulse sequence signal. used to

In some embodiments, further comprising a sensor connected to the head-mounted device and a signal analyzer connected to the sensor, wherein
The sensor is used to collect motion signals output from the head-mounted device and output the motion signals to a signal analyzer;
The signal analyzer is used to convert the motion signal into motion data and output the motion data to a PWM signal parameter processor.

In one embodiment, the PWM signal generator includes an adder and a PWM generator connected to the adder;
the adder is used to generate a PWM sequence based on the control signal and a synchronization signal of an image display frame, and output the PWM sequence to the PWM generator;
The PWM generator outputs the amplified PWM pulse sequence signal to the backlight circuit based on the PWM sequence to turn on or off the backlight circuit based on the control by the PWM pulse sequence signal. Used.

In some embodiments, a PWM signal driver includes a driving chip, an inductor L1, _a capacitor _CIN , a capacitor _COUT , a diode D1, and _a resistor _R1 ,
a sixth pin of the driving chip is connected to a DC power supply; a sixth pin of the driving chip is further connected to a _first end of inductor L1 and a fourth pin of the driving chip; A first pin of a driver chip is connected to _a second end of an inductor L1, a third pin of said driver chip is connected to a _first end of a variable resistor R1, and a resistor R a second end of ₁ is grounded;
_{The second} end of inductor L1 is further connected to the anode of diode _D1 , the cathode of diode D1 is connected to the input terminal of the backlight circuit, and the output terminal of the backlight circuit is connected to resistor connected to the _first end of 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 _D1 , and the the cathode is grounded,
The driving chip uses an AP3127B driving chip.

In one embodiment, the PWM signal driver includes a driver chip, an inductor L1, _a capacitor C _IN , a capacitor C _OUT , a diode D1, a resistor _R1 , _a resistor _R2 , and a resistor R ₃ and
a sixth pin of the driving chip is connected to a DC power supply; a sixth pin of the driving chip is further connected to a _first end of inductor L1 and a fourth pin of the driving chip; A first pin of a driving chip is connected to _a second end of inductor L1, and a third pin of said driving chip is connected to a first end of resistor _R2 , resistor _R2 . a second end of the is grounded;
the first end of resistor _R2 is further connected to the _second end of resistor R3 _, the _first end of resistor R3 being connected to the cathode of diode D1;
_{The second} end of inductor L1 is further connected to the anode of diode _D1 , the cathode of diode D1 is connected to the input terminal of the backlight circuit, and the output terminal of the backlight circuit is connected to resistor connected to the _first end of R1, the second end of resistor _R1 being grounded;
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 _D1 , and the the cathode is grounded,
The driving chip uses an AP3127B driving chip.

In one embodiment, the sensors include acceleration sensors, gyro sensors and/or geomagnetic sensors.

In one embodiment, the acceleration sensor is used to collect a gravitational acceleration signal output from a head-mounted device and output the gravitational acceleration signal to a signal analyzer.

In one embodiment, the gyro sensor is used to collect angular velocity signals output from a head-mounted device and output the angular velocity signals to a signal analyzer.

In one embodiment, the geomagnetic sensor is used to collect directional signals output from a head-mounted device and output the directional signals to a signal analyzer.

Further, a backlight control terminal for a head-mounted device according to the present application includes a processor and a memory for storing instructions executable by the processor,
The processor
generating control parameters of the PWM signal, including the pulse width and pulse delay time of the PWM pulse sequence, based on the display parameters of the display system, converting the control parameters into a control signal and outputting it to a PWM signal generator;
generating 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 outputting the PWM pulse sequence signal to a PWM signal driver;
amplifying the PWM pulse sequence signal and outputting the amplified PWM pulse sequence signal to a backlight circuit to turn on or off the backlight circuit based on control by the PWM pulse sequence signal;
collecting a current signal of the backlight circuit and outputting the current signal to the PWM signal driver to control the PWM signal driver to amplify the PWM pulse sequence signal;
configured as

According to the above technical configuration, the backlight device control system and the terminal for the head-mounted device according to the present application acquire the display parameters of the display system, generate the control parameters of the PWM signal based on the display parameters, Converting the control parameter into a control signal, generating a corresponding PWM pulse sequence signal according to the synchronization signal and control signal of the image display frame of the display system, amplifying the PWM pulse sequence signal, and amplifying the amplified PWM pulse sequence signal is output to the backlight circuit, the backlight circuit can be turned on or off based on control by the PWM pulse sequence signal. The technical configuration of the present application generates a PWM pulse sequence signal using a duty ratio and an appropriate delay time suitable for the display system, and continuously optimizes and adjusts the PWM pulse sequence signal to turn on the backlight circuit. Or the extinguishing can be adjusted more precisely to solve the problem of ghosting in the video image displayed on the display system.

In order to describe the technical solutions of the present application more clearly, the following briefly introduces the drawings used in the examples; Other drawings can be obtained based on the drawing of
1 is a schematic diagram of a head-mounted device in the prior art; FIG. 1 is a schematic diagram of a display system for a head-mounted device in the prior art; FIG. 1 is a structural diagram of a backlight device control system for a head-mounted device according to an embodiment of the present application; FIG. FIG. 4 is a structural diagram of another backlight device control system for a head-mounted device according to an embodiment of the present application; 1 is a circuit principle diagram of a PWM signal generator according to an embodiment of the present application; FIG. 1 is a circuit diagram of a PWM signal driver according to an embodiment of the present application; FIG. FIG. 4 is a circuit diagram of another PWM signal driver according to an embodiment of the present application;

Currently, video images displayed on light and thin head-mounted displays can affect the wearer's experience by creating ghosts in the wearer's eyes. Based on this problem, the embodiments of the present application provide a head-mounted device backlight device control system and a terminal, which utilizes a suitable duty ratio and appropriate delay time for the display system to generate a PWM pulse sequence signal. and to better adjust the amplification situation of the PWM pulse sequence in combination with the current control of the backlight circuit, so that the PWM pulse sequence signal can be continuously optimized and adjusted, and the lighting of the backlight circuit or to solve the ghost problem of the displayed video image in the display system by adjusting the extinguishing more precisely.

FIG. 2 is a structural diagram of a backlight device control system for a head-mounted device according to an embodiment of the present application. As shown in FIG. 2, the system includes a backlight circuit 2 and a display system 3 of a head-mounted device 13, connected in sequence with a PWM signal parameter processor 4, a PWM signal generator 5, and a PWM signal driver 6. and a luminance signal acquisition circuit 7.

The PWM signal parameter processor 4 acquires display parameters of the display system 3, generates control parameters of a PWM signal based on the display parameters, converts the control parameters into control signals, and converts the control signals into PWM signal generation. can be output to the device 5.

The display parameters can be used to indicate feedback data of display effects such as video images in the display system 3, and these feedback data can be obtained based on big data or large sample testing, and can be specifically includes the pulse width (or duty ratio) and pulse delay time of the PWM pulse sequence that can reflect the optimum display effect, these signal data can be stored in the memory or register of the processor, and the generation and means to read from memory or register and output to PWM signal generator 5 . On the other hand, the control parameters include the pulse width and pulse delay time of the obtained specific PWM pulse sequence.

The PWM signal generator 5 generates a corresponding PWM pulse sequence signal based on 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 image display frame data in the display device 3, and the PWM signal parameter processor 4 determines the sequence configuration status of the synchronization signal of the image display frame based on the image display frame, such as the high level and low level of the sequence. can be determined. Furthermore, in combination with previously obtained control parameters, etc., a PWM pulse sequence signal with appropriate pulse width (or duty ratio) and pulse delay time can be analyzed and determined.

Since short ghosting occurs during the conversion of each frame of an image, it is necessary to insert black frames between image frames to avoid the ghosting problem. A PWM signal parameter processor 4 determines the time interval between adjacent image frames based on the image display frame data and provides a control signal to instruct the backlight circuit to turn off when the time interval of the adjacent image frames occurs. to achieve the goal of inserting black frames between image frames. On the other hand, the backlight circuit should be lit when the image frame is normally displayed.

Further, in the embodiment of the present invention, the PWM pulse sequence signal can be used to control lighting or extinguishing of the backlight circuit, and when a high level appears in the PWM pulse sequence, it is possible to instruct lighting of the backlight circuit, When a low level appears in the PWM pulse sequence, it is possible to instruct turning off of the backlight circuit.

PWM (Pulse width modulation) is an analog control form, the basic principle of PWM is to control the switching elements of the inverter circuit on and off, so that the output terminal obtains a series of equal amplitude pulses. and alternating between sinusoidal or desired waveforms in these pulses. In the PWM pulse sequence, the amplitude of each pulse is equal, and the amplitude of the equivalent output sine wave can be changed by changing the width of each pulse by the same proportional coefficient. The pulse voltage output from the inverter circuit has 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 controlled by the PWM pulse sequence signal. Turn on or off.

The luminance signal collecting circuit 7 collects the current signal of the backlight circuit 2 and outputs the current signal to the PWM signal driver 6 so that the PWM signal driver 6 amplifies the PWM pulse sequence signal. control to let

The process of acquiring the luminance signal can be regarded as a feedback process, and by judging the current situation of the backlight circuit 2, the amplification degree of the PWM pulse sequence signal is adjusted, so that the image display has better luminance. do.

Thus, the backlight device control system for the head-mounted device in the above embodiment generates the PWM pulse sequence signal using the duty ratio and the appropriate delay time suitable for the display system, and the backlight circuit 2 In combination with the current control, the amplification status of the PWM pulse sequence can be better adjusted, and the PWM pulse sequence signal can be continuously optimized and adjusted, so that the backlight circuit 2 can be turned on or off more accurately and displayed. It can solve the problem of ghosting of displayed video images in system 3.

FIG. 3 is a structural diagram of another backlight device control system for a head-mounted device according to an embodiment of the present 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 motion signals output from the head-mounted device 13 and outputs the motion signals to the signal analyzer 9 . The signal analyzer 9 converts the operating signal into operating data and outputs this operating data to the PWM signal parameter processor 4 .

The motion signal can be used to indicate the direction of head motion, angle of motion, distance of motion, speed of motion, etc. of a user wearing a head-mounted device. The motion signal may also be understood to indicate the orientation of the head-mounted device, ie, the direction of gravity, the direction of rotation, and the like. In the embodiment of the present application, in order to find the optimal control parameters of the backlight circuit 2, it is necessary to detect the user's movement, and the user's head movement when the image has a ghost problem or the image is not good. can be shaken to further change the attitude of the head-mounted device 13, the change in attitude can be detected by the sensor 8, and a series of calculations determine whether the current image quality meets the requirements. It is possible to know whether or not

In one embodiment, the sensor 8 may be an acceleration sensor, which collects the gravitational acceleration signal output from the head-mounted device 13 and converts the gravitational acceleration signal to the signal analyzer 9 . output to

In this case, the motion data includes gravitational acceleration data, and the PWM signal parameter processor 4 needs to perform the following processing to obtain the control parameters.

In step S101, a video file is selected, and a PWM parameter table for image reproduction including control parameters for controlling lighting or extinguishing of the backlight circuit 2 is set.

In the embodiment of the present application, some image data of the video file may be displayed parameters in the above embodiments, and the PWM signal parameter processor 4 analyzes a series of selectable control parameters after acquiring the image data. However, at present, it is not yet possible to determine which control parameters can optimally display the image, so further screening is required in combination with the gravitational acceleration data.

In step S102, according to the parameter table, the video file is played on the head-mounted device 13, the gravitational acceleration data is periodically collected, and the gravitational acceleration data code is generated according to the set rule.

Since there is a series of control parameters in the parameter table, it is necessary to test for each control parameter for screening, i.e., based on the PWM pulse width and pulse delay time in each control parameter, the video file Play each. At the same time playing the video file, it is also necessary to collect the gravitational acceleration data, when the user is watching the video, such as shaking the head, whether the quality of the image being viewed meets the requirements, ghosting, etc. This is because it is possible to give feedback as to whether or not there is a problem such as The user can generate gravitational acceleration data upon feedback, and the PWM signal parameter processor 4 can analyze these data to analyze whether the user is satisfied with the image quality.

In step S103, it is determined whether the code is an acceptable data code, and if the code is not an acceptable data code, the gravitational acceleration data is continuously collected periodically.

The PWM signal parameter processor 4 generates a gravitational acceleration data code based on the gravitational acceleration data according to the preset conversion rules, and compares the gravitational acceleration data code with a code corresponding to a preset satisfactory posture. If it is the same as or similar to the code corresponding to the preset satisfactory posture, the gravity acceleration data code can be regarded as the acceptable code.

In step S104, if the code is an acceptable data code, it is determined based on the data code whether the currently reproduced image is the optimum image. If the image is not the optimum image, the head-mounted device 13 continues playing the video file or stops playing according to the parameter table.

Finally, the control parameters corresponding to the optimal image are determined as the optimal parameters for playing the video file, and when the video file is played thereafter, it will be played directly according to the control parameters to eliminate image ghosting. problem can be circumvented.

In an embodiment, the sensor 8 may be any combination of two or three sensors, including a gyro sensor, a geomagnetic sensor, or an acceleration sensor as described above, the gyro sensor being a head sensor. Angular velocity signals output from the wearable device 13 are collected, and the geomagnetic sensor collects direction signals output from the head-mounted device 13 . A gyro sensor and a geomagnetic sensor work in the same way as the accelerometer described above.

If the sensor 8 is a gyro sensor, the motion data includes angular velocity data. In step S102 above, it is necessary to collect angular velocity data periodically and generate an angular velocity data code according to a set rule. In the above step S103, if this code is not a valid data code, the angular velocity data will continue to be collected periodically.

If the sensor 8 is a geomagnetic sensor, the operational data includes directional data. In the above step S102, direction data should be collected periodically and a direction data code should be generated according to the set rules. In step S103 above, if the code is not a valid data code, direction data continues to be collected periodically.

If the sensor 8 is an acceleration sensor and a gyro sensor, the motion data includes gravitational acceleration data and angular velocity data. In the above step S102, the gravitational acceleration data and the angular velocity data should be collected periodically, and the gravitational acceleration data code and the angular velocity data code should be generated according to the setting rules. In step S103 above, if this code is not an acceptable data code, the gravitational acceleration data and the angular velocity data are periodically collected.

If the sensor 8 is of an acceleration sensor and a geomagnetic sensor, the motion data includes gravitational acceleration data and orientation data. In step S102 above, the gravitational acceleration data and the direction data should be collected periodically, and the gravitational acceleration data code and the direction data should be generated according to the set rules. In step S103 above, if this code is not an acceptable data code, the gravitational acceleration data and direction data are continued to be collected periodically.

If the sensor 8 is of a gyro sensor and a geomagnetic sensor, the operational data includes angular velocity data and orientation data. In the above step S102, it is necessary to periodically collect the angular velocity data and the directional data, and generate the angular velocity data code and the directional data code according to the setting rule. In step S103 above, if this code is not a valid data code, the angular velocity data and direction data are continued to be collected periodically.

If 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 direction data. In the above step S102, the gravitational acceleration data, the angular velocity data and the directional data should be collected periodically, and the gravitational acceleration data code, the angular velocity data code and the directional data code should be generated according to the setting rules. In step S103 above, if this code is not a valid data code, the gravitational acceleration data, the angular velocity data, and the direction data are continued to be periodically collected.

FIG. 4 is a circuit principle diagram of a PWM signal generator according to an embodiment of the present 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 based on the control signal b and the synchronization signal a of the image display frame, and outputs the PWM sequence to the PWM generator 62, where c in FIG. 4 indicates the pulse delay time. .

The PWM generator 62 outputs an amplified PWM pulse sequence signal to the backlight circuit 2 based on the PWM sequence, thereby turning on or off the backlight circuit 2 based on control by the PWM pulse sequence signal. .

FIG. 5 is a circuit diagram of a PWM signal driver according to an embodiment of the present application. As shown in FIG. 5, the PWM signal driver 6 includes a driving chip 71, an inductor L1 72, _a capacitor _CIN 73, a capacitor _COUT 74, a diode D1 75, _a resistor _R1 76, can include

A sixth pin of the driving chip 71 is connected to a DC power supply, and a sixth pin of the driving chip 71 is further connected to a first end of an inductor L ₁ 72 and a fourth pin of the driving chip 71 . A first pin of the driving chip 71 is connected to a second end of an inductor L ₁ 72 and a third pin of the driving chip 71 is connected to a first end of a variable resistor R ₁ 76. , and the second end of resistor R ₁ 76 is grounded.

_{The second} end of inductor L1 72 is further connected to the anode of diode D1 75, the cathode of diode D1 75 is connected to the input terminal of said backlight circuit ₂ , and the output of said backlight circuit 2 The end is connected to the first end of resistor R ₁ 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, and the anode of the capacitor C _OUT 74 is connected to the cathode of the diode D ₁ 75. , the cathode of the capacitor C _OUT 74 is grounded.

FIG. 6 is a schematic diagram of another PWM signal driver according to an embodiment of the present application. As shown in FIG. 6, the PWM signal driver 6 includes a driving chip 71, an inductor L1 72, _a capacitor _CIN 73, a capacitor _COUT 74, a diode D1 75, _a resistor _R1 76, A resistor R ₂ 77 and a resistor R ₃ 78 are included.

A sixth pin of the driving chip 71 is connected to a DC power supply, and a sixth pin of the driving chip 71 is further connected to a first end of an inductor L ₁ 72 and a fourth pin of the driving chip 71 . A first pin of the driving chip 71 is connected to a second end of an inductor L ₁ 72 and a third pin of the driving chip 71 is connected to a first end of a resistor R ₂ 77. , and the second end of resistor R ₂ 77 is grounded.

The _first end of resistor _R2 77 is further connected to the _second end of resistor R3 78, the _first end of resistor R3 78 is connected to the cathode of diode D1 75. be done.

_{The second} end of inductor L1 72 is further connected to the anode of diode D1 75, the cathode of diode D1 75 is connected to the input terminal of said backlight circuit ₂ , and the output of said backlight circuit 2 The end is connected to a first end of resistor R ₁ 76 and a second end of resistor R ₁ 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, and the anode of the capacitor C _OUT 74 is connected to the cathode of the diode D ₁ 75. , the cathode of the capacitor C _OUT 74 is grounded.

The driving chip 71 in the above embodiment may be an AP3127B driving chip. The AP3127B driver chip is a step-up DC/DC converter with fixed oscillation frequency and constant current output, and is very suitable for backlight driving of electronic products such as mobile phones and digital cameras. The output voltage can reach 16V, 3.2V output voltage can drive 4 LEDs in series, 2.5V input voltage can drive 2 rows of parallel LEDs (each row 3 LEDs in series) can be driven. By varying the duty ratio of the PWM signal on the CE pin, the brightness of the LED can be controlled. In addition, by integrating a field effect transistor with a conduction resistance of 0.8Ω inside and using a microinductor and a capacitor outside, the area of the printed circuit board can be reduced.

Embodiments of the present application further provide a backlight control terminal for a head-mounted device, said terminal including a processor and a memory for storing instructions executable by said processor.

The processor
Based on the display parameters of the display system 3, control parameters including the pulse width and pulse delay time of the PWM pulse sequence of the PWM signal are generated, the control parameters are converted into control signals, and output to the PWM signal generator 5. ,
generating a corresponding PWM pulse sequence signal based on the synchronization signal of the image display frame of the display system 3 and the control signal, and outputting the PWM pulse sequence signal to the PWM signal driver 6;
By amplifying the PWM pulse sequence signal and outputting the amplified PWM pulse sequence signal to the backlight circuit 2, the backlight circuit 2 is turned on or off based on the control by the PWM pulse sequence signal,
collecting the current signal of the backlight circuit 2 and outputting the current signal to the PWM signal driver 6, thereby controlling the PWM signal driver 6 to amplify the PWM pulse sequence signal;
configured as

The processor is further configured to collect motion signals output from the head-mounted device 13 and convert the motion signals into motion data.

The processor further generates a PWM sequence based on the control signal and the synchronization signal of the image display frame, and according to the amplified PWM sequence, turns on or off the backlight circuit 2 based on the PWM pulse sequence signal. configured to

Those skilled in the art will readily conceive of other implementations of the present application upon consideration of this specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application which, in accordance with the general principles of this application, may be subject to claims not disclosed herein. Including known knowledge or common technical means in the technical field. It is intended that the specification and examples be considered as exemplary only, with the true scope of the application being indicated by the following claims.

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

Claims (10)

A backlight device control system for a head-mounted device comprising a backlight circuit (2) and a display system (3) for a head-mounted device (13), comprising:
further comprising a PWM signal parameter processor (4), a PWM signal generator (5), a PWM signal driver (6) and a luminance signal acquisition circuit (7) connected in series;
The PWM signal parameter processor (4) generates control parameters of the PWM signal, including pulse width and pulse delay time of the PWM pulse sequence, based on the display parameters of the display system (3), and converts the control parameters into the control signal and used to output to the PWM signal generator (5),
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) is used to output,
The PWM signal driver (6) amplifies the PWM pulse sequence signal and outputs the amplified PWM pulse sequence signal to the backlight circuit (2), thereby driving the backlight circuit (2) to the PWM pulse sequence signal. It is used to turn on or off based on the control by
The luminance signal collection circuit (7) collects the current signal of the backlight circuit (2) and outputs the current signal to the PWM signal driver (6), thereby is used to control the amplification of the PWM pulse sequence signal;
A backlight device control system for a head-mounted device, characterized by: further comprising a sensor (8) connected to the head-mounted device (13) and a signal analyzer (9) connected to the sensor (8);
the sensor (8) is used to collect motion signals output from the head-mounted device (13) and output the motion signals to a signal analyzer (9);
the signal analyzer (9) is used to convert the motion signal into motion data and output the motion data to a PWM signal parameter processor (4);
The control system according to claim 1, characterized in that: The PWM signal generator (5) includes an adder (61) and a PWM generator (62) connected to the adder (61),
The adder (61) is used to generate a PWM sequence based on the control signal and the synchronization signal of the image display frame and output the PWM sequence to the PWM generator (62),
The PWM generator (62) outputs the amplified PWM pulse sequence signal to the backlight circuit (2) based on the PWM sequence, thereby controlling the backlight circuit (2) with the PWM pulse sequence signal. used to turn on and off based on
3. The control system according to claim 2, characterized in that: The PWM signal driver (6) includes a driving chip (71), an inductor L1 (72), _a capacitor _CIN (73), a capacitor _COUT (74), _a diode D1 (75) and a resistor R ₁ (76) and
A sixth pin of the driving chip (71) is connected to a DC power supply, and a sixth pin of the driving chip (71) is further connected to a _first end of an inductor L1 (72) and the driving chip (71). 71), the first pin of said driving chip (71) is connected to the second end of inductor L ₁ (72), the third terminal of said driving chip (71). the pin is connected to a first end of variable resistor R ₁ (76) and a second end of resistor R ₁ (76) is grounded;
_{The second} end of inductor L1 (72) is further connected to the anode of diode D1 (75), the cathode of diode D1 (75) is connected to the input end of said backlight circuit ( ₂ ). , the output of said backlight circuit (2) is connected to a first end of a resistor R ₁ (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 a diode connected to the cathode of D ₁ (75) and the cathode of capacitor C _OUT (74) is grounded;
The driving chip (71) uses an AP3127B driving chip,
4. The control system according to claim 3, characterized in that: The PWM signal driver (6) includes a driving chip (71), an inductor L1 (72), _a capacitor _CIN (73), a capacitor _COUT (74), _a diode D1 (75) and a resistor including R ₁ (76), resistor R ₂ (77), and resistor R ₃ (78);
A sixth pin of the driving chip (71) is connected to a DC power supply, and a sixth pin of the driving chip (71) is further connected to a _first end of an inductor L1 (72) and the driving chip (71). 71), the first pin of said driving chip (71) is connected to the second end of inductor L ₁ (72), the third terminal of said driving chip (71). the pin is connected to a first end of resistor _R2 (77) and a _second end of resistor R2 (77) is grounded;
The first end of resistor R ₂ (77) is further connected to the second end of resistor R ₃ (78), the first end of resistor R ₃ (78) being connected to diode D ₁ (75) connected to the cathode of
_{The second} end of inductor L1 (72) is further connected to the anode of diode D1 (75), the cathode of diode D1 (75) is connected to the input end of said backlight circuit ( ₂ ). , the output end of said backlight circuit (2) is connected to a first end of a resistor R ₁ (76), a second end of the resistor R ₁ (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 a diode connected to the cathode of D ₁ (75) and the cathode of capacitor C _OUT (74) is grounded;
The driving chip (71) uses AP3127B driving chip,
4. The control system according to claim 3, characterized in that: The sensor (8) includes an acceleration sensor, a gyro sensor and/or a geomagnetic sensor,
3. The control system according to claim 2, characterized in that: The acceleration sensor is used to collect the gravitational acceleration signal output from the head-mounted device (13) and output the gravitational acceleration signal to the signal analyzer (9).
7. The control system of claim 6, wherein: The gyro sensor is used to collect the angular velocity signal output from the head-mounted device (13) and output the angular velocity signal to the signal analyzer (9).
7. The control system of claim 6, wherein: The geomagnetic sensor is used to collect a directional signal output from a head-mounted device (13) and output the directional signal to a signal analyzer (9).
7. The control system of claim 6, wherein: a processor and a memory for storing instructions executable by the processor;
The processor
Based on the display parameters of the display system (3), generating control parameters of the PWM signal, including the pulse width and pulse delay time of the PWM pulse sequence, converting the control parameters into control signals to generate the PWM signal generator (5) ), and
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, and outputting 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 a backlight circuit (2) to light or extinguish the backlight circuit (2) based on control by the PWM pulse sequence signal;
collecting the current signal of the backlight circuit (2) and outputting the current signal to the PWM signal driver (6) so that the PWM signal driver (6) amplifies the PWM pulse sequence signal; A backlight control terminal for a head-mounted device, characterized by:

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