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

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 acq

Description

[0001] This application relates to the field of optical technologies, and in particular, to a backlight apparatus control system and terminal of a head mounted device. BACKGROUND OF THE INVENTION

[0002] A head mounted device is a human-computer interaction device. Common head mounted device systems include external systems and integrated systems. The external head mounted device system is provided with an independent screen and a computer host and an input / output device that are connected to the independent screen. The integrated head mounted device system does not have any input / output device, and a data processor is also disposed in the head mounted device. FIG. 1-1 shows an external head mounted device system with operating handles. A data processing system and an input / output device are integrated in operating handles 11 and 12, and a head mounted device 13 is connected with the handles 11 and 12 through data lines. For a form of the integrated head mounted device system, reference may be made to the head mounted device 13. The data processor of the system is disposed in the head mounted device 13.

[0003] Refer to FIG. 1-2 for a display system of the head mounted device 13. A display module 21 is carried in a spectacle frame 131, and includes a backlight module 211, a display screen 212, and a lens group 213. An image displayed on the display screen 212 forms an image in eyes, of a wearer, that is close to the lens group 213 through the lens group 213. The backlight module 211 can provide sufficient brightness and uniformly distributed light sources, so that the display screen 212 can display images normally.

[0004] However, because the head mounted device 13 needs to be worn like ordinary glasses, the spectacle frame 131 is required to be thin and light as possible. For example, the head mounted device manufactured by using the lens module provided in the invention patent with application number US20170017078B is like this. Regarding the thin and light head mounted device 13, the display screen 212 thereof is closer to the eyes. Further, the display screen 212 of the head mounted device respectively provides images for left and right eye. Therefore, due to this special structure, response time of the display screen 212, persistence of vision, brightness of the backlight module 211, and other reasons, a video image displayed on the display screen 212 may form a smear in the eyes of the wearer, thus affecting experience effects of the wearer. SUMMARY OF THE INVENTION

[0005] This application provides a backlight apparatus control system and terminal of a head mounted device, to resolve a problem that at present, a video image displayed in a head mounted display device that is thin and light may form a smear in eyes of a wearer, and thus experience effects of the wearer are affected.

[0006] This application provides a backlight apparatus control system of a head mounted device, including a backlight circuit and a display system of a head mounted device, and further including a PWM signal parameter processor, a PWM signal generator, a PWM signal driver, and a brightness signal collection circuit that are sequentially connected, where

[0007] the PWM signal parameter processor is configured to generate a control parameter of a PWM signal based on a display parameter of the display system, the control parameter including a pulse width and pulse delay time of a PWM pulse sequence, and to convert the control parameter as a control signal to be output to the PWM signal generator;

[0008] the PWM signal generator is configured to generate a corresponding PWM pulse sequence signal based on a synchronization signal of an image display frame of the display system and the control signal, and output the PWM pulse sequence signal to the PWM signal driver;

[0009] the PWM signal driver is configured 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 through control of the PWM pulse sequence signal; and

[0010] the brightness signal collection circuit is configured to collect a current signal of the backlight circuit, and output the current signal to the PWM signal driver, to control the PWM signal driver to amplify the PWM pulse sequence signal.

[0011] In some embodiments, a sensor connected to the head mounted device and a signal parser connected to the sensor are further included, where

[0012] the sensor is configured to collect an action signal output by the head mounted device, and output the action signal to the signal parser; and

[0013] the signal parser is configured to convert the action signal as action data, and output the action data to the PWM signal parameter processor.

[0014] In some embodiments, the PWM signal generator includes an adder and a PWM generator connected to the adder, where

[0015] the adder is configured 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; and

[0016] the PWM generator is configured to output the amplified PWM pulse sequence signal to the backlight circuit based on the PWM sequence, so that the backlight circuit is turned on or off through control of the PWM pulse sequence signal.

[0017] In some embodiments, the PWM signal driver includes a drive chip, an inductor Li, a capacitor Cin, a capacitor Cout, a diode Di, and a resistor Ri;

[0018] a sixth pin of the drive chip is connected with a direct current power, the sixth pin of the drive chip is further connected to a first end of the inductor Li and a fourth pin of the drive chip; a first pin of the drive chip is connected to a second end of the inductor Li; a third pin of the drive chip is connected to a first end of the variable resistor Ri; a second end of the resistor Ri is connected to the ground;

[0019] the second end of the inductor Li is further connected to a positive electrode of the diode Di, and a negative electrode of the diode Di is connected to an input end of the backlight circuit; an output end of the backlight circuit is connected to the first end of the resistor Ri;

[0020] a positive electrode of the capacitor Cin is connected to the sixth pin of the drive chip, and a negative electrode of the capacitor Cin is connected to the ground; and a positive electrode of the capacitor Cout is connected to the negative electrode of the diode Di, and a negative electrode of the capacitor Cout is connected to the ground, where

[0021] the drive chip is an AP3127B drive chip.

[0022] In some embodiments, the PWM signal driver includes a drive chip, an inductor Li, a capacitor Cin, a capacitor Cout, a diode Di, a resistor Ri, a resistor R2, and a resistor R3;

[0023] a sixth pin of the drive chip is connected with a direct current power, the sixth pin of the drive chip is further connected to a first end of the inductor Li and a fourth pin of the drive chip; a first pin of the drive chip is connected to a second end of the inductor Li; a third pin of the drive chip is connected to a first end of the resistor R2; a second end of the resistor R2 is connected to the ground;

[0024] the first end of the resistor R2 is further connected to a second end of the resistor R3, and a first end of the resistor R3 is connected to a negative electrode of the diode Di;

[0025] the second end of the inductor Li is further connected to a positive electrode of the diode Di, and the negative electrode of the diode Di is connected to an input end of the backlight circuit; an output end of the backlight circuit is connected to a first end of the resistor Ri; a second end of the resistor Ri is connected to the ground;

[0026] a positive electrode of the capacitor Cin is connected to the sixth pin of the drive chip, and a negative electrode of the capacitor Cin is connected to the ground; and a positive electrode of the capacitor Cout is connected to the negative electrode of the diode Di, and a negative electrode of the capacitor Cout is connected to the ground, where

[0027] the drive chip is an AP3127B drive chip.

[0028] In some embodiments, the sensor includes an acceleration sensor, a gyro sensor, and / or a geomagnetic sensor.

[0029] In some embodiments, the acceleration sensor is configured to collect a gravity acceleration signal output by the head mounted device, and output the gravity acceleration signal to the signal parser.

[0030] In some embodiments, the gyro sensor is configured to collect an angular velocity signal output by the head mounted device, and output the angular velocity signal to the signal parser.

[0031] In some embodiments, the geomagnetic sensor is configured to collect a direction signal output by the head mounted device, and output the direction signal to the signal parser.

[0032] This application further provides a backlight control terminal of a head mounted device, where the terminal includes a processor and a memory configured to store executable instructions of the processor; and the processor is configured to:

[0033] generate a control parameter of a PWM signal based on a display parameter of a display system, wherein the control parameter includes a pulse width and pulse delay time of a PWM pulse sequence, and to convert the control parameter as a control signal to be output to a PWM signal generator;

[0034] generate a corresponding PWM pulse sequence signal based on a synchronization signal of an image display frame of the display system and the control signal, and output the PWM pulse sequence signal to a PWM signal driver;

[0035] amplify the PWM pulse sequence signal, and output the amplified PWM pulse sequence signal to a backlight circuit, so that the backlight circuit is turned on or off through control of the PWM pulse sequence signal; and

[0036] collect a current signal of the backlight circuit, and output the current signal to the PWM signal driver, to control the PWM signal driver to amplify the PWM pulse sequence signal.

[0037] It may be learned from the foregoing technical solutions that according to the backlight apparatus control system and terminal of a head mounted device provided in this application, the display parameter of the display system can be obtained; the control parameter of the PWM signal is generated based on the display parameter, and the control parameter is converted as a control signal; the corresponding PWM pulse sequence signal is generated based on the synchronization signal of the image display frame of the display system and the control signal; and the PWM pulse sequence signal is amplified; and the amplified PWM pulse sequence signal is output to the backlight circuit, so that the backlight circuit is turned on or off through control of the PWM pulse sequence signal. In the solutions of this application, the PWM pulse sequence signal can be generated by using a duty ratio suitable for the display system and an appropriate delay, so that the PWM pulse sequence signal can be continuously optimized and adjusted, thus adjusting the backlight circuit to be turned on or off more accurately. In this way, a problem that a video image displayed in the display system forms a smear is resolved. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] To more clearly describe the technical solutions of this application, the accompanying drawings to be used in the embodiments are briefly illustrated below. Obviously, persons of ordinary skills in the art can also derive other accompanying drawings according to these accompanying drawings without an effective effort.

[0039] FIG 1-1 is a schematic diagram of a head mounted device illustrated in the prior art;

[0040] FIG. 1-2 is a schematic diagram of a display system of a head mounted device illustrated in the prior art;

[0041] FIG 2 is a structural diagram of a backlight apparatus control system of a head mounted device illustrated in an embodiment of this application;

[0042] FIG. 3 is a structural diagram of another backlight apparatus control system of a head mounted device illustrated in an embodiment of this application;

[0043] FIG. 4 is a schematic circuit diagram of a PWM signal generator illustrated in an embodiment of this application;

[0044] FIG. 5 is a circuit diagram of a PWM signal driver illustrated in an embodiment of this application; and

[0045] FIG. 6 is a circuit diagram of another PWM signal driver illustrated in an embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] At present, a video image displayed in a head mounted display device that is thin and light may form a smear in eyes of a wearer, and thus experience effects of the wearer are affected. On the basis of this problem, embodiments of this application provide a backlight apparatus control system and terminal of a head mounted device. A PWM pulse sequence signal is generated by using a duty ratio suitable for a display system and an appropriate delay, and amplification of a PWM pulse sequence is better adjusted in combination with current control of a backlight circuit, so that the PWM pulse sequence signal can be continuously optimized and adjusted, thus adjusting the backlight circuit to be turned on or off more accurately. In this way, a problem that a video image and the like displayed in the display system forms a smear is resolved.

[0047] FIG. 2 is a structural diagram of a backlight apparatus control system of a head mounted device illustrated in an embodiment of this 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 further includes a PWM signal parameter processor 4, a PWM signal generator 5, a PWM signal driver 6, and a brightness signal collection circuit 7 that are sequentially connected.

[0048] The PWM signal parameter processor 4 may obtain a display parameter of the display system 3, generate a control parameter of a PWM signal based on the display parameter, and further convert the control parameter as a control signal to be output to the PWM signal generator 5.

[0049] The display parameter may be used to indicate feedback data about display effects of a video image and the like in the display system 3. The feedback data may be obtained by testing big data or a big sample, and specifically includes a pulse width (or duty ratio) and pulse delay time of a PWM pulse sequence that can reflect optimum display effects. These signal data may be stored in a memory or a register of a processor. Meaning of generation is to read the signal data from the memory or the register and output the same to the PWM signal generator 5. Moreover, the control parameter includes a pulse width and pulse delay time of a specific PWM pulse sequence that is obtained.

[0050] The PWM signal generator 5 generates a corresponding PWM pulse sequence signal based on a synchronization signal of an 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.

[0051] The display parameter includes data of the image display frame of the display system 3. The PWM signal parameter processor 4 may determine sequence composition, such as arrangement of high and low levels of the sequence, of the synchronization signal of the image display frame based on the image display frame. A PWM pulse sequence signal with an appropriate pulse width (or duty ratio) and pulse delay time may be analyzed and determined in combination with the control parameter and the like that are previously obtained.

[0052] Since a transient smearing phenomenon occurs when each frame of an image is changed, a black frame needs to be inserted between image frames to avoid a smear. The PWM signal parameter processor 4 can determine a time gap between adjacent image frames through data of the image display frame, and generate a control signal. In this way, the control signal can instruct the backlight circuit to be turned off when a time gap between adjacent image frames occurs, thus inserting a black frame between image frames can be realized. However, when the image frame is normally displayed, the backlight circuit needs to be turned on.

[0053] In addition, in this embodiment of this application, the backlight circuit is controlled to be turned on or off through the PWM pulse sequence signal. When a high level occurs in the PWM pulse sequence, the backlight circuit may be instructed to be turned on, and when a low level occurs in the PWM pulse sequence, the backlight circuit may be instructed to be turned off.

[0054] PWM (pulse width modulation) is an analog control method. A basic principle of PWM is to control on and off of a switching device of an inverter circuit, so that an output end obtains a series of pulses with equal amplitudes. These pulses are used to replace with sine wave or a required waveform. In the PWM pulse sequence, amplitudes of all pulses are equal. An amplitude of an equivalent output sine wave may be changed merely by changing widths of various pulses according to a same proportional coefficient. Therefore, in an AC-DC-AC frequency converter, a pulse voltage output by a PWM inverter circuit is an amplitude of a DC side voltage.

[0055] 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 through control of the PWM pulse sequence signal.

[0056] The brightness signal collection circuit 7 collects a 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.

[0057] A process of collecting a brightness signal may be regarded as a feedback process. Amplification degree of the PWM pulse sequence signal is continuously adjusted by determining a current situation of the backlight circuit 2, so that an image is displayed with better brightness.

[0058] In view of the above, according to the backlight apparatus control system of a head mounted device in the foregoing embodiment, a PWM pulse sequence signal may be generated by using a duty ratio suitable for a display system and an appropriate delay, and amplification of the PWM pulse sequence may be better adjusted in combination with current control of the backlight circuit 2, so that the PWM pulse sequence signal can be continuously optimized and adjusted, thus adjusting the backlight circuit 2 to be turned on or off more accurately. In this way, a problem that a video image displayed in the display system 3 forms a smear is resolved.

[0059] FIG. 3 is a structural diagram of another backlight apparatus control system of a head mounted device illustrated in an embodiment of this application. As shown in FIG. 3, the foregoing system may further include a sensor 8 connected to the head mounted device 13 and a signal parser 9 connected to the sensor 8.

[0060] The sensor 8 collects an action signal output by the head mounted device 13, and outputs the action signal to the signal parser 9. The signal parser 9 converts the action signal as action data, and outputs the action data to the PWM signal parameter processor 4.

[0061] The action signal may be used to indicate a direction of a head action, an angle of the action, a distance of the action, a speed of the action, or the like of a user who wears the head mounted device. It may also be understood as that the action signal indicates a posture of the head mounted device, that is, a direction of gravity, a direction of rotation, and the like. In this embodiment of this application, to find an optimum control parameter of the backlight circuit 2, an action of the user needs to be detected. When an image has a smear or poor look and feel occurs, the user may shake the head to change a posture of the head mounted device 13. Changes of the posture may be detected by the sensor 8. Thus, whether current image quality satisfies the requirements may be learned through a series of calculations.

[0062] In some embodiments, the sensor 8 may be an acceleration sensor. The acceleration sensor collects a gravity acceleration signal output by the head mounted device 13, and outputs the gravity acceleration signal to the signal parser 9.

[0063] In this case, the action data includes gravity acceleration data, and the PWM signal parameter processor 4 needs to perform the following steps to obtain the control parameter.

[0064] Step S101. Select a video file, and set a PWM parameter table for image playing, where the parameter table includes control parameters for controlling the backlight circuit 2 to be turned on or off.

[0065] In the embodiments of this application, some image data of the video file may serve as the display parameter in the foregoing embodiments. After obtaining the image data, the PWM signal parameter processor 4 may analyze a series of optional control parameters, but which control parameter can make the image displayed optimally cannot be determined yet for the moment. Therefore, further screening needs to be performed in combination with the gravity acceleration data.

[0066] Step SI02. Play the video file in the head mounted device 13 according to the parameter table; and periodically collect the gravity acceleration data, to generate gravity acceleration data code according to a set rule.

[0067] Because there are a series of control parameters in the parameter table, in order to screen, all control parameters need to be tested. In other words, the video file is respectively played based on a PWM pulse width and pulse delay time in each control parameter. While playing the video file, the gravity acceleration data further needs to be collected because when the user is viewing a video, whether quality of the viewed image satisfies the requirements, whether there is a smear, and other problems may be fed back through shaking the head and other actions. The user may generate gravity acceleration data during the feedback, and the PWM signal parameter processor 4 may analyze the data to analyze whether the user is satisfied with the image quality.

[0068] Step SI03. Determinewhether the code is qualified data code, and if the code is not qualified data code, continue to periodically collect the gravity acceleration data.

[0069] The PWM signal parameter processor 4 may generate gravity acceleration data code based on the gravity acceleration data according to a preset conversion rule, and then determine the gravity acceleration data code based on code corresponding to a preset satisfactory posture and the like. If the gravity acceleration data code is the same with or similar to the code corresponding to the preset satisfactory posture, the gravity acceleration data code may be regarded as qualified code.

[0070] Step S104. If the code is qualified data code, determine whether a currently played image is an optimum image based on the data code, and obtain a control parameter corresponding to the optimum image if the image is an optimum image; and if the image is not an optimum image, continue to play the video file in the head mounted device 13 according to the parameter table or exit.

[0071] Finally, the control parameter corresponding to the optimum image is determined as an optimum parameter for playing the video file. Subsequently, the video file may be directly played based on this control parameter, thus avoiding an image smear.

[0072] In some embodiments, the sensor 8 may alternatively be a gyro sensor, a geomagnetic sensor, a combination of any two or three sensors including the foregoing acceleration sensor. The gyro sensor collects an angular velocity signal output by the head mounted device 13. The geomagnetic sensor collects a direction signal output by the head mounted device 13. Functions of the gyro sensor and the geomagnetic sensor are same to a function of the acceleration sensor.

[0073] When the sensor 8 is a gyro sensor, the action data includes angular velocity data. Moreover, in the foregoing step SI02, the angular velocity data needs to be periodically collected, to generate angular velocity data code according to a set rule. In the foregoing step SI03, if the code is not qualified data code, the angular velocity data is continued to be periodically collected.

[0074] When the sensor 8 is a geomagnetic sensor, the action data includes direction data. Moreover, in the foregoing step SI02, the direction data needs to be periodically collected, to generate direction data code according to a set rule. In the foregoing step SI03, if the code is not qualified data code, the direction data is continued to be periodically collected.

[0075] When the sensor 8 is an acceleration sensor and a gyro sensor, the action data includes gravity acceleration data and angular velocity data. Moreover, in the foregoing step SI02, the gravity acceleration data and the angular velocity data need to be periodically collected, to generate angular velocity data code according to a set rule. In the foregoing step S103, if the code is not qualified data code, the gravity acceleration data and the angular velocity data are continued to be periodically collected.

[0076] When the sensor 8 is an acceleration sensor and a geomagnetic sensor, the action data includes gravity acceleration data and direction data. Moreover, in the foregoing step SI02, the gravity acceleration data and the direction data need to be periodically collected, to generate angular velocity data code according to a set rule. In the foregoing step SI 03, if the code is not qualified data code, the gravity acceleration data and the direction data are continued to be periodically collected.

[0077] When the sensor 8 is a gyro sensor and a geomagnetic sensor, the action data includes angular velocity data and direction data. Moreover, in the foregoing step SI02, the angular velocity data and the direction data need to be periodically collected, to generate angular velocity data code according to a set rule. In the foregoing step SI03, if the code is not qualified data code, the angular velocity data and the direction data are continued to be periodically collected.

[0078] When the sensor 8 is an acceleration sensor, a gyro sensor, and a geomagnetic sensor, the action data includes gravity acceleration data, angular velocity data, and direction data. Moreover, in the foregoing step SI02, the gravity acceleration data, the angular velocity data, and the direction data need to be periodically collected, to generate angular velocity data code according to a set rule. In the foregoing step SI03, if the code is not qualified data code, the gravity acceleration data, the angular velocity data, and the direction data are continued to be periodically collected.

[0079] FIG 4 is a schematic circuit diagram of a PWM signal generator illustrated in an embodiment of this application. As shown in FIG. 4, the PWM signal generator 5 in this embodiment of this application includes an adder 61 and a PWM generator 62 connected to the adder 61. The adder 61 generates a PWM sequence based on a control signal b and a synchronization signal a of the image display frame, and outputs the PWM sequence to the PWM generator 62. The c in FIG. 4 indicates the pulse delay time.

[0080] The PWM generator 62 outputs the amplified PWM pulse sequence signal to the backlight circuit 2 based on the PWM sequence, so that the backlight circuit 2 is turned on or off through control of the PWM pulse sequence signal.

[0081] FIG. 5 is a circuit diagram of a PWM signal driver illustrated in an embodiment of this application. As shown in FIG. 5, the PWM signal driver 6 may include a drive chip 71, an inductor Li 72, a capacitor Cin 73, a capacitor Colt 74, a diode Di 75, and a resistor Ri 76.

[0082] A sixth pin of the drive chip 71 is connected with a direct current power. The sixth pin of the drive chip 71 is further connected to a first end of the inductor Li 72 and a fourth pin of the drive chip 71. A first pin of the drive chip 71 is connected to a second end of the inductor Li 72. A third pin of the drive chip 71 is connected to a first end of the variable resistor Ri 76. A second end of the resistor Ri 76 is connected to the ground.

[0083] The second end of the inductor Li 72 is further connected to a positive electrode of the diode Di 75, and a negative electrode of the diode Di 75 is connected to an input end of the backlight circuit 2. An output end of the backlight circuit 2 is connected to the first end of the resistor Ri 76.

[0084] A positive electrode of the capacitor Cin 73 is connected to the sixth pin of the drive chip 71, and a negative electrode of the capacitor Cin 73 is connected to the ground. A positive electrode of the capacitor Cout 74 is connected to the negative electrode of the diode Di 75, and a negative electrode of the capacitor Cour 74 is connected to the ground.

[0085] FIG. 6 is a circuit diagram of another PWM signal driver illustrated in an embodiment of this application. As shown in FIG. 6, the PWM signal driver 6 may further include a drive chip 71, an inductor Li 72, a capacitor Cin 73, a capacitor Cout 74, a diode Di 75, a resistor Ri 76, a resistor R2 77, and a resistor R3 78.

[0086] A sixth pin of the drive chip 71 is connected with a direct current power. The sixth pin of the drive chip 71 is further connected to a first end of the inductor Li 72 and a fourth pin of the drive chip 71. A first pin of the drive chip 71 is connected to a second end of the inductor Li 72. A third pin of the drive chip 71 is connected to a first end of the resistor R? 77. A second end of the resistor R2 77 is connected to the ground.

[0087] The first end of the resistor R2 77 is further connected to a second end of the resistor R3 78, and a first end of the resistor R3 78 is connected to a negative electrode of the diode Di 75.

[0088] The second end of the inductor Li 72 is further connected to a positive electrode of the diode Di 75, and the negative electrode of the diode Di 75 is connected to an input end of the backlight circuit 2. An output end of the backlight circuit 2 is connected to a first end of the resistor Ri 76. A second end of the resistor Ri 76 is connected to the ground.

[0089] A positive electrode of the capacitor Cin 73 is connected to the sixth pin of the drive chip 71, and a negative electrode of the capacitor Cin 73 is connected to the ground. A positive electrode of the capacitor Cout 74 is connected to the negative electrode of the diode Di 75, and a negative electrode of the capacitor Cout 74 is connected to the ground.

[0090] The drive chip 71 in the foregoing embodiment may be an AP3127B drive chip. The AP3127B drive chip is a step-up DC / DC converter with a fixed oscillation frequency and constant current output, and is much suitable for backlight driving of electronic products such as mobile phones and digital cameras. An output voltage may be 16V. An output voltage of 3.2V can drive four LEDs that are connected in series, and an input voltage of 2.5V can drive two paths of LEDs that are connected in parallel (three LEDs are connected in series in each path). Brightness of the LED may be controlled by changing a duty ratio of a PWM signal on a CE pin. In addition, a field effect transistor with an on resistance of 0.8 £1 is integrated within the drive chip, and miniature inductors and capacitors may be used outside the drive chip, to reduce an area of a printed board.

[0091] An embodiment of this application further provides a backlight control terminal of a head mounted device. The terminal includes a processor and a memory configured to store executable instructions of the processor.

[0092] The processor is configured to:

[0093] generate a control parameter of a PWM signal based on a display parameter of a display system 3, wherein the control parameter includes a pulse width and pulse delay time of a PWM pulse sequence, and to convert the control parameter as a control signal to be output to a PWM signal generator 5;

[0094] generate a corresponding PWM pulse sequence signal based on a synchronization signal of an 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;

[0095] amplify the PWM pulse sequence signal, and output the amplified PWM pulse sequence signal to a backlight circuit 2, so that the backlight circuit 2 is turned on or off through control of the PWM pulse sequence signal; and

[0096] collect a 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.

[0097] The processor is further configured to collect an action signal output by a head mounted device 13, and convert the action signal as action data.

[0098] The processor is further configured to generate a PWM sequence based on the control signal and the synchronization signal of the image display frame; and according to the amplified PWM sequence, enable the backlight circuit 2 to be turned on or off based on the PWM pulse sequence signal.

[0099] A person skilled in the art would easily conceive of other implementation solutions of this application after considering the specification and practicing the application disclosed herein. This application is intended to cover any variation, use, or adaptive change of this application. These variations, uses, or adaptive changes follow the general principle of this application and include the common general knowledge or common technical means in this technical filed that is not disclosed in this application. The specification and the embodiments are merely considered as exemplary, and the actual scope of this application is indicated in the claims.

[00100] It should be understood that this application is not limited to the exact structure that is 5 described above and is shown in the figures, and various modifications and changes can be made thereto, without departing from the scope thereof. The foregoing implementations of the present invention do not constitute any limitation on the protection scope of the present invention.

Claims

1. A backlight apparatus control system of a head mounted device, comprising a backlight circuit (2) and a display system (3) of a head mounted device (13), and further comprising a PWM signal parameter processor (4), a PWM signal generator (5), a PWM signal driver (6), and a brightness signal collection circuit (7) that are sequentially connected, whereinthe PWM signal parameter processor (4) is configured to generate a control parameter of a PWM signal based on a display parameter of the display system (3), the control parameter comprising a pulse width and pulse delay time of a PWM pulse sequence, and to convert the control parameter as a control signal to be output to the PWM signal generator (5);the PWM signal generator (5) is configured to generate a corresponding PWM pulse sequence signal based on a synchronization signal of an 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) is turned on or off through control of the PWM pulse sequence signal; andthe brightness signal collection circuit (7) is configured to collect a 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.

2. The control system according to claim 1, further comprising a sensor (8) connected to the head mounted device (13) and a signal parser (9) connected to the sensor (8), whereinthe sensor (8) is configured to collect an action signal output by the head mounted device (13), and output the action signal to the signal parser (9); andthe signal parser (9) is configured to convert the action signal as action data, and output the action data to the PWM signal parameter processor (4).

3. 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), whereinthe adder (61) is configured to generate a PWM sequence based on the control signal andthe synchronization signal of the image display frame, and output the PWM sequence to the PWM generator (62); andthe PWM generator (62) is configured to output the amplified PWM pulse sequence signal to the backlight circuit (2) based on the PWM sequence, so that the backlight circuit (2) is turned on or off through control of the PWM pulse sequence signal.

4. The control system according to claim 3, wherein the PWM signal driver (6) comprises a drive chip (71), an inductor Li (72), a capacitor Cin (73), a capacitor Cout (74), a diode Di (75), and a resistor Ri (76);a sixth pin of the drive chip (71) is connected with a direct current power, the sixth pin of the drive chip (71) is further connected to a first end of the inductor Li (72) and a fourth pin of the drive chip (71); a first pin of the drive chip (71) is connected to a second end of the inductor Li (72); a third pin of the drive chip (71) is connected to a first end of the variable resistor Ri (76); a second end of the resistor Ri (76) is connected to the ground;the second end of the inductor Li (72) is further connected to a positive electrode of the diode Di (75), and a negative electrode of the diode Di (75) is connected to an input end of the backlight circuit (2); an output end of the backlight circuit (2) is connected to the first end of the resistor Ri (76);a positive electrode of the capacitor Cin (73) is connected to the sixth pin of the drive chip (71), and a negative electrode of the capacitor Cin (73) is connected to the ground; and a positive electrode of the capacitor Cout (74) is connected to the negative electrode of the diode Di (75), and a negative electrode of the capacitor Cout (74) is connected to the ground, whereinthe drive chip (71) is an AP3127B drive chip.

5. The control system according to claim 3, wherein the PWM signal driver (6) comprises a drive chip (71), an inductor Li (72), a capacitor Cin (73), a capacitor Cout (74), a diode Di (75), a resistor Ri (76), a resistor R2 (77), and a resistor R3 (78);a sixth pin of the drive chip (71) is connected with a direct current power, the sixth pin of the drive chip (71) is further connected to a first end of the inductor Li (72) and a fourth pin of the drive chip (71); a first pin of the drive chip (71) is connected to a second end of the inductorLi (72); a third pin of the drive chip (71) is connected to a first end of the resistor R2 (77); a second end of the resistor R2 (77) is connected to the ground;the first end of the resistor R2 (77) is further connected to a second end of the resistor R3 (78), and a first end of the resistor R3 (78) is connected to a negative electrode of the diode Di (75);the second end of the inductor Li (72) is further connected to a positive electrode of the diode Di (75), and the negative electrode of the diode Di (75) is connected to an input end of the backlight circuit (2); an output end of the backlight circuit (2) is connected to a first end of the resistor Ri (76); a second end of the resistor Ri (76) is connected to the ground;a positive electrode of the capacitor Cin (73) is connected to the sixth pin of the drive chip (71), and a negative electrode of the capacitor Cin (73) is connected to the ground; and a positive electrode of the capacitor Cout (74) is connected to the negative electrode of the diode Di (75), and a negative electrode of the capacitor Cour (74) is connected to the ground, whereinthe drive chip (71) is an AP3127B drive chip.

6. The control system according to claim 2, wherein the sensor (8) comprises an acceleration sensor, a gyro sensor, and / or a geomagnetic sensor.

7. The control system according to claim 6, wherein the acceleration sensor is configured to collect a gravity acceleration signal output by the head mounted device (13), and output the gravity acceleration signal to the signal parser (9).

8. The control system according to claim 6, wherein the gyro sensor is configured to collect an angular velocity signal output by the head mounted device (13), and output the angular velocity signal to the signal parser (9).

9. The control system according to claim 6, wherein the geomagnetic sensor is configured to collect a direction signal output by the head mounted device (13), and output the direction signal to the signal parser (9).

10. A backlight control terminal of a head mounted device, wherein the terminal comprises a processor and a memory configured to store executable instructions of the processor; andgenerate a control parameter of a PWM signal based on a display parameter of a display system (3), the control parameter comprising a pulse width and pulse delay time of a PWM pulse sequence, and to convert the control parameter as a control signal to be output to a PWM signal generator (5);5 generate a corresponding PWM pulse sequence signal based on a synchronization signal of an 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);amplify the PWM pulse sequence signal, and output the amplified PWM pulse sequence signal to a backlight circuit (2), so that the backlight circuit (2) is turned on or off through 10 control of the PWM pulse sequence signal; andcollect a 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.

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