CN113126672A - Infrared emission circuit, mobile device and control method of proximity sensor - Google Patents
Infrared emission circuit, mobile device and control method of proximity sensor Download PDFInfo
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- CN113126672A CN113126672A CN202010032775.2A CN202010032775A CN113126672A CN 113126672 A CN113126672 A CN 113126672A CN 202010032775 A CN202010032775 A CN 202010032775A CN 113126672 A CN113126672 A CN 113126672A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D25/00—Control of light, e.g. intensity, colour or phase
- G05D25/02—Control of light, e.g. intensity, colour or phase characterised by the use of electric means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/20—Detecting, e.g. by using light barriers using multiple transmitters or receivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/12—Synchronisation between the display unit and other units, e.g. other display units, video-disc players
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
- H04M1/0266—Details of the structure or mounting of specific components for a display module assembly
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2250/00—Details of telephonic subscriber devices
- H04M2250/12—Details of telephonic subscriber devices including a sensor for measuring a physical value, e.g. temperature or motion
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Abstract
The disclosure relates to an infrared emission circuit, a mobile device and a control method of a proximity sensor. An infrared emission circuit comprising: the synchronous delay circuit comprises a synchronous delay circuit, a booster circuit and a plurality of emitters which are arranged in series, wherein the input end of the booster circuit is connected with the synchronous delay circuit, the output end of the booster circuit is connected with the plurality of emitters which are arranged in series, the output end of the synchronous delay circuit is connected with the input end of the booster circuit, and the input end of the synchronous delay circuit is used for being connected with a display panel. The synchronous delay circuit is used for sending a boosting signal to the booster circuit after the pixels of the display panel are lightened in a delayed mode for a set time, and the booster circuit boosts the voltage of the plurality of emitters arranged in series to working voltage according to the boosting signal, so that the plurality of emitters arranged in series emit infrared signals when the pixels of the display panel are extinguished. The synchronous delay circuit enables the light emitter to emit infrared signals when the pixels of the display panel are turned off, so that the problem of exciting bright spots can be avoided.
Description
Technical Field
The disclosure relates to the technical field of sensors, and in particular relates to an infrared emission circuit, a mobile device and a control method of a proximity sensor.
Background
A full-screen has become a trend of mobile device development, but when sensors, earphones, cameras and the like are not completely arranged under the screen of the mobile device, narrow-slit optical sensors including proximity sensors and ambient light sensing sensors are the mainstream design scheme at present. However, the proximity sensor arranged under the display screen can excite the bright spots of the screen, and the display quality of the screen is affected.
Disclosure of Invention
The disclosure provides an infrared emission circuit, a mobile device and a control method of a proximity sensor, which can avoid the problem that a screen excites bright spots.
In order to achieve the purpose, the technical scheme adopted by the disclosure is as follows:
according to a first aspect of embodiments of the present disclosure, there is provided an infrared emission circuit for a proximity sensor, comprising:
the synchronous delay circuit comprises a synchronous delay circuit, a booster circuit and a plurality of emitters which are arranged in series, wherein the input end of the booster circuit is connected with the synchronous delay circuit, the output end of the booster circuit is connected with the plurality of emitters which are arranged in series, the output end of the synchronous delay circuit is connected with the input end of the booster circuit, and the input end of the synchronous delay circuit is used for being connected with a display panel;
the synchronous delay circuit is used for sending a boosting signal to the boosting circuit after the pixels of the display panel are lightened and delaying the set time, and the boosting circuit boosts the voltage of the plurality of emitters which are arranged in series to working voltage according to the boosting signal so that the plurality of emitters which are arranged in series emit infrared signals when the pixels of the display panel are lightened.
Optionally, the input ends of the plurality of emitters arranged in series are connected to the power supply through a first resistor, the output ends of the plurality of emitters arranged in series are grounded, and the output end of the voltage boost circuit is connected to the first resistor.
Optionally, the emitter is a light emitting diode or a vertical cavity surface emitting laser.
Optionally, the synchronous delay circuit includes a controller, an input end of the controller is used for being connected with a driving chip of the display panel, and an output end of the controller is connected with an input end of the voltage boost circuit; the controller is used for determining the set time to be delayed according to the time from the turning-on to the turning-off of the pixels of the display panel, and sending the delay time of the boosting signal to the boosting circuit.
Optionally, the synchronous delay circuit further includes a timer, an input end of the timer is used for being connected with a driving chip of the display panel, and an output end of the timer is connected with an input end of the controller; the timer is used for determining the set time to be delayed according to the time from the starting of the lighting of the pixels of the display panel to the next extinguishing of the pixels of the display panel, and sending the set time to the controller.
According to a second aspect of embodiments of the present disclosure, there is provided a mobile device comprising: the display panel is arranged on the front face of the middle frame shell, the proximity sensor is arranged below the display panel, the proximity sensor comprises the infrared emission circuit in any one of the embodiments, the display panel comprises a driving chip, and a synchronous delay circuit of the infrared emission circuit is connected with the driving chip; the driving chip is used for scanning the pixels of the display panel and sending scanning signals to the synchronous delay circuit, and the synchronous delay circuit confirms the time from the start of lighting to the next turning-off of the pixels of the display panel according to the scanning signals so as to determine the set time to be delayed.
Optionally, a surface of the display panel on a side close to the proximity sensor is provided with a light absorption material layer.
According to a third aspect of embodiments of the present disclosure, there is provided a control method of a proximity sensor of a mobile device, the mobile device including a display panel and the proximity sensor, the proximity sensor including an infrared emission circuit, the control method including:
when the pixels of the display panel are lighted, controlling an infrared emission circuit of the proximity sensor to be closed; and controlling an infrared emission circuit of the proximity sensor to be started within the interval time when the pixels of the display panel are extinguished.
Optionally, when the pixels of the display panel are lighted, after delaying for a set time, controlling the infrared emission circuit of the proximity sensor to be started; the set time is the time from the turning-on of the pixels of the display panel to the turning-off of the pixels of the display panel.
Alternatively, the set time to be delayed is determined by a timer.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
this is disclosed through setting up a plurality of emitters, steps up the operating voltage that meets the requirements to a plurality of emitters through boost circuit, can reduce the energy density of every emitter, reduces the influence to the pixel display of display panel. The synchronous delay circuit enables the light emitter to emit infrared signals when the pixels of the display panel are turned off, and the infrared signals are not emitted when the pixels of the display panel are turned on, so that the problem of exciting bright spots can be avoided, and the use experience is optimized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
Fig. 1 is a schematic structural diagram of an infrared emission circuit according to an exemplary embodiment of the present disclosure.
Fig. 2 is a schematic diagram of a photoelectric conversion and analog processing circuit of a proximity sensor according to an exemplary embodiment of the disclosure.
Fig. 3 is a schematic structural diagram of a synchronous delay circuit of an infrared transmitting circuit according to an exemplary embodiment of the present disclosure.
Fig. 4 is a schematic structural diagram of a synchronous delay circuit of another infrared transmitting circuit according to an exemplary embodiment of the disclosure.
Detailed Description
The present disclosure will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments do not limit the disclosure, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the disclosure.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
The disclosure provides an infrared emission circuit, a mobile device and a control method of a proximity sensor, which can avoid the problem that a screen excites bright spots. The infrared transmitting circuit, the mobile device, and the control method of the proximity sensor according to the present disclosure will be described in detail below with reference to the drawings, and features of the following embodiments and implementations may be combined with each other without conflict.
Referring to fig. 1, an embodiment of the present disclosure provides an infrared emission circuit for a proximity sensor, including:
When the driving chip 90 of the display panel starts to scan the pixels of the display panel line by line, the synchronous delay circuit 10 is configured to send a boost signal to the boost circuit 20 after the pixels of the display panel are turned on and after a set time is delayed, and the boost circuit 20 boosts the voltage of the plurality of emitters 30 arranged in series to a working voltage according to the boost signal, so that the plurality of emitters 30 arranged in series emit infrared signals when the pixels of the display panel are turned off.
According to the display panel, the plurality of emitters 30 are arranged, the plurality of emitters 30 are boosted to the working voltage meeting the requirement through the boosting circuit 20, the energy density of each emitter 30 can be reduced, and the influence on pixel display of the display panel is reduced. The light emitter emits infrared signals when the pixels of the display panel are turned off through the synchronous delay technology, and the infrared signals are not emitted when the pixels of the display panel are turned on, so that the problem of exciting bright spots can be avoided, and the use experience is optimized.
In some alternative embodiments, the Proximity sensor (sensor) includes a transmitter and a receiver, and the transmitter may be an energy-based or time-based detection distance. The emitter can adopt led (Light-Emitting Diode) with infrared 850nm/940nm, namely a Light-Emitting Diode, and can also be a Vertical-Cavity Surface-Emitting Laser (Vsecl). The receiver may employ an energy-based pd (Photo-Diode), i.e., a photodiode, or a Single Photon Avalanche Diode (span). In this embodiment, the transmitter is led and the receiver is pd.
According to the method, a plurality of LEDs are connected in series, and the number n of LEDs is more than or equal to 2. In the example shown in the figure, the number of the led is three, and the light emitting efficiency of three leds is the same. When v is needed for the emission voltage of a single led, and the current is i, since the current-voltage characteristic curves of the same led are the same and the circuits of the series circuits are the same, when the current i is the same, the voltages v of the three leds are also the same according to the current-voltage characteristic curves. Therefore, when the n led are arranged in series, the total working voltage required is nV, and the plurality of led connected in series are boosted through the boosting circuit to boost the working voltage to nV. Because the voltage can have certain fluctuation, the booster circuit boosts a plurality of serially connected led to V equal to 1.1nV, and even if the power supply voltage VDD is reduced, the consistency of the transmitting power of the proximity sensor can be ensured. If m of the n leds are damaged, the total operating voltage at this time needs to be V ═ V (n-m) voltage, and at this time, the boost circuit can make the operating voltage of the multiple leds arranged in series equal to V by feeding back the duty ratio, so as to avoid damaging the circuit.
Referring to fig. 2, a schematic diagram of a photoelectric conversion and analog processing circuit of a proximity sensor according to the present disclosure is shown. The photoelectric conversion and analog processing circuit comprises a photoelectric conversion circuit, a primary operational amplifier circuit, a low-pass filter circuit, a secondary operational amplifier circuit and a sampling hold circuit. The photoelectric conversion circuit includes a current source 41, a photodiode 42, a first capacitor C1, and a second resistor R2, which are arranged in parallel.
The first-stage operational amplifier circuit comprises a first signal amplifier 51, a third resistor R3 and a fourth resistor R4 which are connected with the positive terminal of the first signal amplifier 51 and are arranged in series, a fifth resistor R5 connected with the negative terminal of the first signal amplifier 51 and a sixth resistor R6 connected with the fifth resistor R5 in parallel, wherein the sixth resistor R6 is grounded. One end of the current source 41, the photodiode 42, the first capacitor C1 and the second resistor R2, which are arranged in parallel, is connected to the positive terminal of the first signal amplifier 51 through the third resistor R3 and the fourth resistor R4, and the other end of the current source 41, the photodiode 42, the first capacitor C1 and the second resistor R2, which are arranged in parallel, is connected to the negative terminal of the first signal amplifier 51 through the fifth resistor R5. The two ends of the first signal amplifier 51 are further provided with a second capacitor C2 and a seventh resistor R7 which are arranged in parallel.
The low pass filter circuit includes an eighth resistor R8 connected to the output terminal of the first signal amplifier 51 and a third capacitor C3 provided in parallel with the eighth resistor R8, the third capacitor C3 being grounded.
The two-stage operational amplifier circuit comprises a second signal amplifier 52, a ninth resistor R9 connected to the positive terminal of the second signal amplifier 52, and a tenth resistor R10 connected to the negative terminal of the second signal amplifier 52, wherein the tenth resistor R10 is grounded, and the ninth resistor R9 is connected in series with the eighth resistor R8. A fourth capacitor C4 and at least one set of feedback resistors are also provided across the second signal amplifier 52 in parallel. Each feedback resistor is connected across the second signal amplifier 52 by a switching device. Two sets of feedback resistors are shown in fig. 2, wherein a first feedback resistor R11 is connected across the second signal amplifier 52 through a first switching device Q1. The second feedback resistor R12 is connected across the second signal amplifier 52 through a second switching device Q2. A first terminal of a first switching device Q1 is connected to a first feedback resistor R11 and to an input terminal of the second signal amplifier 60. A second terminal of the first switching device Q1 is connected to an output terminal of the second signal amplifier 60. The second feedback resistor R12 and the second switching device Q2 are arranged in the same manner as the first feedback resistor R11 and the first switching device Q1, and are not described again.
The sample-and-hold circuit includes a third signal amplifier 53 and a thirteenth resistor R13 connected to the positive terminal of the third signal amplifier 53 through a third switching device Q3, the negative terminal of the third signal amplifier 53 being grounded. A fifth capacitor C5 is also provided across the third signal amplifier 53. The output of the third signal amplifier 53 is connected to a digital-to-analog converter (ADC)54, the output of which is connected to a register 55.
The photodiode 42 converts the optical signal into a current signal after receiving the optical signal, and the converted current signal is amplified by the first stage operational amplifier of the first signal amplifier 51, amplified by a certain multiple by the first stage operational amplifier, and then enters the second stage operational amplifier through the low pass filter circuit. The second stage operational amplifier is provided with an automatic gain control circuit, namely the operational amplifier is bridged on the output and input resistors of the operational amplifier and is controlled by a mos tube (namely a switching device), the corresponding feedback resistors are controlled by the automatic gain to be opened to realize different amplification factors, the operational amplifier signals passing through the second stage enter a sampling and holding circuit, sampling is started through a digital-to-analog converter 54, and sampling data are stored in a register 55. In practical application, when a user makes a call, the proximity sensor starts to work, the microprocessor of the mobile device can acquire data in the register 55, the microprocessor converts an obtained binary number into a decimal signal and compares the decimal signal with a proximity far threshold set by the system, and when the mobile device is larger than the proximity threshold, a proximity state is reported to the system, and the display panel enters a screen-off state. When the mobile equipment is far away from the human face, the signal acquired by the microprocessor is smaller than the far threshold, the far state is reported, and the display panel is switched from the screen-off state to the screen-on state.
Referring to fig. 3, in some alternative embodiments, the synchronous delay circuit includes a controller 11, an input terminal of the controller 11 is configured to be connected to a driving chip 90 of the display panel, and an output terminal of the controller 11 is connected to an input terminal of the voltage boost circuit 20. The controller 11 is configured to determine a set time to be delayed according to a time from a start of lighting to a next turning-off of a pixel of the display panel, and send a delay time of the boost signal to the boost circuit 20, so that the boost circuit 20 boosts a voltage of the plurality of emitters 30 arranged in series to a working voltage after the delay set time, so that the plurality of emitters 30 arranged in series emit an infrared signal when the pixel of the display panel is turned off, and a display effect of the display panel is not affected.
When the driving chip 90 of the display panel starts scanning the pixels, a frame synchronization signal is sent to the synchronization delay circuit 10 and sent to the controller 11, and the controller 11 calculates a delay time according to the position of the proximity sensor. Meanwhile, the driving chip 90 sends a frame of synchronization signal to a processor core of the display panel, the processor core prepares for the next frame of data to be displayed and sends the next frame of data to the driving chip 90, when the next frame of data starts to be refreshed from the first row and the first column of data, the frame synchronization signal received by the controller 11 is sent to the voltage boosting circuit 20, the voltage boosting circuit 20 boosts the voltage of the plurality of emitters 30 arranged in series to working voltage after delaying for a set time, and the plurality of emitters 30 arranged in series emit infrared signals when the pixels of the display panel are extinguished.
Referring to fig. 4, in some alternative embodiments, the synchronous delay circuit 10 further includes a timer 70, an input of the timer 70 is configured to be connected to a driving chip 90 of the display panel, and an output of the timer 70 is connected to an input of the controller 11. The timer 70 is configured to determine a set time to be delayed according to a time from the turning-on of the pixels of the display panel to the turning-off of the pixels of the display panel, and send the set time to the controller 11. The controller 11 sends the delay time of the boost signal to the boost circuit 20 according to the determined set time to be delayed, so that the boost circuit 20 boosts the voltage of the plurality of emitters 30 arranged in series to a working voltage after the delay set time, so that the plurality of emitters 30 arranged in series emit infrared signals when the pixels of the display panel are turned off, and the display effect of the display panel is not affected.
The frame synchronization signal sent by the driving chip 90 of the display panel reports that a frame signal is completed, the counter 70 starts timing, when the timing reaches the time when the display panel updates the pixels in the row to the adjacent pixels above the proximity sensor under the screen, the counter 70 determines the set time to be delayed and outputs a signal to the controller 11, the controller 11 sends the delay time of the boosting signal to the boosting circuit 20 according to the determined set time to be delayed, so that the boosting circuit 20 boosts the voltage of the plurality of emitters 30 arranged in series to working voltage after the delay set time, so that the emitters 30 arranged in series emit infrared signals when the pixels of the display panel are extinguished, and the display effect of the display panel cannot be influenced. When the timer 70 times that the pixel display refresh time of the next frame is over, a turn-off signal is sent to the controller 11, and the controller 11 controls the step-up circuit 20 to turn off, thereby turning off the emitter without affecting the normal display of the pixels of the display panel. It can be understood that the emitter emits infrared light and the pixels of the display panel display normally, and the infrared light and the pixels can work alternately by calculating the accurate time of the timer.
Assuming that the pixel refresh rate of the display panel is F, the data display time of each frame is t 1/F, the length of the display panel of the mobile device in the y direction is L1, the proximity sensor is disposed below the display panel and is L2 away from the top of the display panel, the pixel refresh of the display panel is the first coordinate origin from the upper left of the mobile device, and from top to bottom and from left to right, the time that the proximity sensor must delay and integrate in each frame of synchronization signal is from the origin to the proximity sensor. If the time for the processor core of the display panel to prepare a frame of data and send the frame of data to the driver chip is t1, the time for the display panel to refresh the frame of data is t 2-t 1, and the time required for the delay is: t3 ═ (L2/L1) × t 2.
It should be noted that the synchronous delay circuit 30 can also be implemented by: (1) the software mode of the controller is realized; (2) the circuit hardware inside the controller is realized; (3) a microprocessor is arranged between a driving chip of the display panel and the proximity sensor; (4) and is implemented by using a digital circuit.
An embodiment of the present disclosure further provides a mobile device, including: center casing, display panel and proximity sensor, display panel set up in the front of center casing, proximity sensor set up in display panel's below, proximity sensor includes infrared transmitting circuit, display panel includes driver chip, infrared transmitting circuit's synchronous delay circuit with driver chip connects. The driving chip is used for scanning the pixels of the display panel and sending scanning signals to the synchronous delay circuit, and the synchronous delay circuit confirms the time from the start of lighting to the next turning-off of the pixels of the display panel according to the scanning signals so as to determine the set time to be delayed. It should be noted that the description of the infrared emission circuit in the above embodiments and implementations is also applicable to the mobile device of the present disclosure. The mobile device may be a mobile phone, a tablet computer, etc.
In some alternative embodiments, a surface of the display panel near one side of the proximity sensor is provided with a light absorbing material layer. The display panel is provided with a black light absorption material layer on one side surface close to the proximity sensor, and the requirement of the black light absorption material is that the black color of the black light absorption material layer is on the wall surface of the optical cavity, and the black light absorption material layer is not in a mirror design, so that the light reflected by the transmitter of the proximity sensor to the receiver through the optical cavity of the display panel can be prevented.
The embodiment of the present disclosure also provides a control method of a proximity sensor of a mobile device, where the mobile device includes a display panel and the proximity sensor, the proximity sensor includes an infrared emission circuit, and the control method includes: and controlling an infrared emission circuit of the proximity sensor to be closed when the pixel of the display panel is lighted. And controlling an infrared emission circuit of the proximity sensor to be started within the interval time when the pixels of the display panel are extinguished. The light emitter emits infrared signals when the pixels of the display panel are turned off, and does not emit the infrared signals when the pixels of the display panel are turned on, so that the problem of exciting bright spots can be avoided, and the use experience is optimized.
In some alternative embodiments, the time when the pixels of the display panel are turned off may be controlled by a delay control manner to allow the light emitter to emit an infrared signal, and the light emitter does not emit light when the pixels of the display panel are turned on. And when the pixels of the display panel are lightened, the infrared emission circuit of the proximity sensor is controlled to be started after the set time is delayed. The set time is the time from the turning-on of the pixels of the display panel to the turning-off of the pixels of the display panel. When a driving chip of the display panel starts to scan the pixels, a frame synchronization signal is sent to the synchronous delay circuit, and the synchronous delay circuit calculates a delay time according to the position of the proximity sensor. And simultaneously, the driving chip sends a frame of synchronous signal to a processor core of the display panel, the processor core prepares the next frame of data to be displayed and sends the next frame of data to the driving chip, and when the next frame of data starts to be refreshed from the first row and the first column of data, the frame synchronous signal received by the synchronous delay circuit delays the set time and then controls the infrared emission circuit of the proximity sensor to be started. The infrared signal is emitted by the light emitter when the pixels of the display panel are turned off, and the infrared signal is not emitted when the pixels of the display panel are turned on, so that the problem of exciting bright spots can be avoided, and the use experience is optimized.
In some alternative embodiments, the set time to be delayed is determined by a timer. The synchronous delay circuit may include a timer. The method comprises the steps that a frame signal is reported to be completed through a frame synchronization signal sent by a driving chip of a display panel, a counter starts timing, when the timing is up to the time that the display panel updates a row of pixels to the adjacent pixels above a line of a proximity sensor under a screen, the counter determines the set time to be delayed and outputs a signal to an infrared emission circuit, and after the set time is delayed, the infrared emission circuit of the proximity sensor is controlled to be started. The infrared signal is emitted by the light emitter when the pixels of the display panel are turned off, and the infrared signal is not emitted when the pixels of the display panel are turned on, so that the problem of exciting bright spots can be avoided, and the use experience is optimized.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. An infrared emission circuit for a proximity sensor, comprising:
the synchronous delay circuit comprises a synchronous delay circuit, a booster circuit and a plurality of emitters which are arranged in series, wherein the input end of the booster circuit is connected with the synchronous delay circuit, the output end of the booster circuit is connected with the plurality of emitters which are arranged in series, the output end of the synchronous delay circuit is connected with the input end of the booster circuit, and the input end of the synchronous delay circuit is used for being connected with a display panel;
the synchronous delay circuit is used for sending a boosting signal to the boosting circuit after the pixels of the display panel are lightened and delaying the set time, and the boosting circuit boosts the voltage of the plurality of emitters which are arranged in series to working voltage according to the boosting signal so that the plurality of emitters which are arranged in series emit infrared signals when the pixels of the display panel are lightened.
2. The infrared transmitting circuit of claim 1, wherein the input terminals of the plurality of emitters arranged in series are connected to a power source through a first resistor, the output terminals of the plurality of emitters arranged in series are grounded, and the output terminal of the voltage boosting circuit is connected to the first resistor.
3. The infrared emitting circuit of claim 1, wherein the emitter is a light emitting diode or a vertical cavity surface emitting laser.
4. The infrared emission circuit of claim 1, wherein the synchronous delay circuit comprises a controller, an input terminal of the controller is used for being connected with a driving chip of a display panel, and an output terminal of the controller is connected with an input terminal of the voltage boost circuit; the controller is used for determining the set time to be delayed according to the time from the turning-on to the turning-off of the pixels of the display panel, and sending the delay time of the boosting signal to the boosting circuit.
5. The infrared emission circuit of claim 4, wherein the synchronous delay circuit further comprises a timer, an input terminal of the timer is used for being connected with a driving chip of a display panel, and an output terminal of the timer is connected with an input terminal of the controller; the timer is used for determining the set time to be delayed according to the time from the starting of the lighting of the pixels of the display panel to the next extinguishing of the pixels of the display panel, and sending the set time to the controller.
6. A mobile device, comprising: the display panel is arranged on the front face of the middle frame shell, the proximity sensor is arranged below the display panel, the proximity sensor comprises the infrared emission circuit as claimed in any one of claims 1 to 5, the display panel comprises a driving chip, and a synchronous delay circuit of the infrared emission circuit is connected with the driving chip; the driving chip is used for scanning the pixels of the display panel and sending scanning signals to the synchronous delay circuit, and the synchronous delay circuit confirms the time from the start of lighting to the next turning-off of the pixels of the display panel according to the scanning signals so as to determine the set time to be delayed.
7. The mobile device of claim 6, wherein a surface of the display panel adjacent to the proximity sensor is provided with a light absorbing material layer.
8. A control method of a proximity sensor of a mobile device, the mobile device including a display panel and the proximity sensor, the proximity sensor including an infrared emission circuit, the control method comprising:
when the pixels of the display panel are lighted, controlling an infrared emission circuit of the proximity sensor to be closed; and controlling an infrared emission circuit of the proximity sensor to be started within the interval time when the pixels of the display panel are extinguished.
9. The control method according to claim 8, wherein when the pixel of the display panel is lighted, the infrared emission circuit of the proximity sensor is controlled to be started after a set time is delayed; the set time is the time from the turning-on of the pixels of the display panel to the turning-off of the pixels of the display panel.
10. The control method according to claim 9, wherein the set time to be delayed is determined by a timer.
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