CN111505730A - Proximity sensor and terminal device - Google Patents
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- CN111505730A CN111505730A CN202010314329.0A CN202010314329A CN111505730A CN 111505730 A CN111505730 A CN 111505730A CN 202010314329 A CN202010314329 A CN 202010314329A CN 111505730 A CN111505730 A CN 111505730A
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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
- G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
Abstract
The disclosure relates to a proximity sensor and a terminal device, and belongs to the technical field of proximity detection. The proximity sensor provided by the disclosure improves the detection accuracy of a proximity object. The proximity sensor includes: a transmitter and a receiver. Wherein, the emitter is used for emitting detection infrared light. The receiver includes at least one temperature sensing element and a signal processing assembly. At least one temperature sensing element is used for sensing the infrared light reflected by the target object to output a thermoelectric signal. The signal processing assembly is connected with the at least one temperature sensing piece and used for outputting a detection signal according to the thermoelectric signal.
Description
Technical Field
The present disclosure relates to the field of proximity detection technologies, and in particular, to a proximity sensor and a terminal device.
Background
With the development of touch technology, touch screens become a major component of terminal devices. And realizing touch operation of the terminal equipment through the touch display screen.
However, when the user uses the terminal device with the touch display screen, for example, during a call, the face of the user may approach the display screen and cause a false touch. Therefore, a proximity sensor is required to be provided in the terminal device to detect whether or not the target object is in proximity to the terminal device.
Disclosure of Invention
The present disclosure provides a proximity sensor and a terminal device to detect whether a target object approaches a display screen.
In a first aspect, embodiments of the present disclosure provide a proximity sensor, including:
a transmitter for transmitting detection infrared light; and
a receiver comprising at least one temperature sensing element and a signal processing assembly;
the at least one temperature sensing element is used for sensing the detected infrared light reflected by the target object to output a thermoelectric signal;
the signal processing assembly is connected with the at least one temperature sensing piece and used for outputting a detection signal according to the thermoelectric signal.
In one embodiment, the temperature sensing element comprises: a measurement end and a reference end; the measuring end is induced by the detection infrared light reflected by the target object, so that the reference end outputs a thermoelectric signal.
In one embodiment, the temperature sensing element comprises a first conductor and a second conductor, wherein the first conductor and the second conductor are made of different materials;
the measuring end is formed at the joint of the first conductor and the second conductor,
the free ends of the first and second conductors form the reference terminal.
In one embodiment, the receiver comprises at least two of the temperature sensing elements in series.
In one embodiment, the signal processing assembly comprises:
the signal amplification circuit is connected with at least one temperature sensing piece and used for converting the thermoelectric signal into an amplified signal; and
and the analog-to-digital conversion circuit is connected with the signal amplification circuit and is used for converting the amplified signal into the detection signal.
In one embodiment, the wavelength of the detection infrared light is greater than or equal to 1300 nm.
In one embodiment, the transmitter comprises: the driving piece is used for driving the light emitting piece to output the detection infrared light.
In a second aspect, an embodiment of the present disclosure provides a terminal device, where the terminal device includes: a processor, and the proximity sensor of the first aspect;
and the processor is connected with the proximity sensor and used for controlling the emitter to emit and detect infrared rays and determining the distance from a target object to the terminal equipment according to a detection signal output by the proximity sensor.
In one embodiment, the processor is connected with a signal processing component in the receiver, and receives the detection signal output by the signal processing component;
and the processor determines that a target object is close to the terminal device in response to the detection signal being greater than or equal to a proximity threshold.
In one embodiment, the emitter includes a driving member and a glowing member; the processor is further connected with the driving piece and used for controlling the emitting piece to output the detection infrared light, and the wavelength of the detection infrared light is larger than 1300 nm.
In one embodiment, the terminal device further includes: the display screen is arranged above the proximity sensor, and the part of the display screen corresponding to the proximity sensor is used for displaying images.
The proximity sensor and the terminal equipment provided by the disclosure have at least the following beneficial effects:
the proximity sensor provided by the embodiment of the disclosure realizes effective monitoring of a proximity target object through the temperature sensing piece. The closer the target object is to the proximity sensor, the stronger the energy of the detected infrared light reflected back by the target object is, and the larger the value of the detection signal output by the receiving end is. The farther the target object is from the proximity sensor, the weaker the energy of the detected infrared light reflected back by the target object, and the value of the detection signal output by the receiving end indicates. And, with the mode that the receiver adopts the light of two polar light of photoelectricity, the proximity sensor that this disclosed embodiment provided has the characteristics that detect accurate, respond to rapidly, further optimizes user experience.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a schematic diagram illustrating a proximity sensor in accordance with an exemplary embodiment;
FIG. 2 is a schematic diagram of a transmitter shown in accordance with an exemplary embodiment;
FIG. 3 is a schematic diagram of a receiver shown in accordance with an exemplary embodiment;
FIG. 4 is a schematic diagram illustrating the structure of a signal processing assembly according to an exemplary embodiment;
FIG. 5 is a schematic diagram of a terminal device shown in accordance with an exemplary embodiment;
FIG. 6 is a diagram illustrating a correspondence of detection signals to target object-to-terminal device distances, according to an example embodiment;
fig. 7 is a block diagram of a terminal device shown according to an example embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
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. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of the terms "a" or "an" and the like in the description and in the claims of this disclosure do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, the word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprises" or "comprising" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in the specification and claims of this disclosure, 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 is meant to encompass any and all possible combinations of one or more of the associated listed items.
Fig. 1 is a schematic diagram illustrating a proximity sensor according to an exemplary embodiment. As shown in fig. 1, a proximity sensor 100 provided by the embodiment of the present disclosure includes: a transmitter 110 and a receiver 120.
The emitter 110 is used to emit detection infrared light. Fig. 2 is a schematic diagram of a transmitter structure shown in accordance with an exemplary embodiment. As shown in FIG. 2, emitter 110 includes a driving member 111 and a light emitting member 112 (e.g., an infrared light emitting diode). The driving member 111 serves to send a driving current to the light emitting member 112 so that the light emitting member 112 outputs a detection infrared light.
Optionally, the detected infrared light is infrared light with a wavelength greater than or equal to 1300 nm. In this way, when the proximity sensor is disposed below the display screen, the infrared detection light output by the emitter 110 does not excite the pixels of the display screen to emit light, thereby avoiding the occurrence of bright spots on the screen.
With continued reference to fig. 1, the receiver 120 includes at least one temperature sensing element 121, and a signal processing assembly 122 coupled to the at least one temperature sensing element 121.
The temperature sensing member 121 has a bezier effect, and outputs a pyroelectric signal in response to the detection infrared light reflected by the target object. Specifically, the temperature sensing member 121 absorbs the detection infrared light reflected by the external target object, and then outputs a thermoelectric signal in response to a temperature change caused by the absorption of the infrared light.
Fig. 3 is a schematic diagram illustrating a structure of a receiver according to an example embodiment. As shown in fig. 3, the temperature sensing member 121 includes a measuring end 1211 and a reference end 1212. The measuring terminal 1211 senses the detected infrared light reflected by the target object, so that the reference terminal 1212 outputs a thermoelectric signal.
In one embodiment, the temperature sensing element 121 includes a first conductor 121a and a second conductor 121 b. The first conductor 121a and the second conductor 121b are made of different materials. One end of the first conductor 121a is connected to one end of the second conductor 121b to form a measurement terminal 1211. The free ends of the first and second conductors 121a and 121b form a reference terminal 1212. Specifically, the reference end 1212 includes two interfaces (1212a and 1212b) for connecting with the signal processing assembly 122.
In this way, the first conductor 121a and the second conductor 121b form one thermocouple. The temperature of the measuring end 1211 rises due to absorption of the detected infrared rays reflected back by the target object, so that there is a temperature difference between the measuring end 1211 and the reference end 1212. Further, based on the bezier effect, an electromotive force difference occurs between the two interfaces (1212a and 1212b) of the reference terminal 1212, so that the reference terminal 1212 outputs a thermoelectric signal.
Also, the value of the thermoelectric signal output from the reference terminal 1212 is correlated with the temperature difference between the measurement terminal 1211 and the reference terminal 1212. In the case of keeping the temperature of the reference terminal 1212 relatively stable, the higher the temperature of the measurement terminal 1211, the larger the value of the thermoelectric signal output from the reference terminal 1212. Therefore, the thermoelectric signal output from the reference terminal 1212 can be indicative of the temperature of the measurement terminal 1211.
In the disclosed embodiment, the closer the target object is to the proximity sensor 100, the stronger the energy of the detected infrared light reflected back by the target object. Further, the infrared light absorbed by the measurement terminal 1211 of the temperature sensing member 121 increases, and the temperature difference between the measurement terminal 1211 and the reference terminal 1212 increases, so that the value of the pyroelectric signal output from the reference terminal 1212 increases. The farther a target object is from proximity sensor 100, the weaker the energy of the detected infrared light that is reflected back by the target object. Further, the infrared light absorbed by the measurement terminal 1211 of the temperature sensing element 121 is decreased, and the temperature difference between the measurement terminal 1211 and the reference terminal 1212 is decreased, so that the value of the pyroelectric signal outputted from the reference terminal 1212 is decreased.
In this way, the thermoelectric signal output by the temperature sensing element 121 can reflect the distance from the target object to the proximity sensor 100, and the proximity sensor 100 can detect the proximity target object.
In one embodiment, the receiver 120 includes at least two temperature sensing elements 121 in series. Accordingly, the at least two temperature sensing elements 121 connected in series sense the detected red light reflected back from the target object to output a strong thermoelectric signal, so as to increase the thermoelectric signal output by the at least two temperature sensing elements 121 as a whole, thereby facilitating the subsequent determination of the distance from the target object to the proximity sensor 100 based on the thermoelectric signal.
Alternatively, when the receiver 120 includes a plurality of temperature sensing elements 121, the plurality of temperature sensing elements 121 form a sensing element array, such as a rectangular array, a circular array, or the like, to increase a receiving surface area for receiving the detection infrared light reflected back by the target object, thereby improving the detection sensitivity of the proximity sensor.
With continued reference to fig. 3, the receiver 120 further includes a signal processing assembly 122 coupled to the temperature sensing element 121. The signal processing component 122 is configured to output a detection signal according to the thermoelectric signal output by the temperature sensing element 121, where the detection signal is a digital signal.
Fig. 4 is a schematic diagram illustrating a structure of a signal processing assembly according to an exemplary embodiment. As shown in fig. 4, the signal processing section 122 includes a signal amplifying circuit 1221 and an analog-to-digital converting circuit 1222.
The signal amplification circuit 1221 is connected to two ports (1212a and 1212b) of the reference terminal 1212 of the temperature sensing element 121. Optionally, the signal amplification circuit 1221 includes an operational amplifier 1221a coupled to the interface 1212a and the interface 1212b for converting the thermoelectric signal output from the reference terminal 1212 into an amplified signal.
The analog-to-digital conversion circuit 1222 is connected to the signal amplification circuit 1221, and includes a sample-and-hold circuit 1222a and an analog-to-digital converter 1222b connected to the sample-and-hold circuit 1222 a. The amplified signal output from the signal amplification circuit 1221 is converted into a detection signal by the analog-to-digital conversion circuit 1222. In this manner, data transmission by the proximity sensor with other electronic devices (e.g., processors, etc.) is facilitated.
The proximity sensor provided by the embodiment of the disclosure realizes effective monitoring of a proximity target object through the temperature sensing piece. And, with the mode that the receiver adopted the two polar light of photoelectricity, the mode that adopts temperature-sensing spare to export the thermoelectric signal has sensitivity height, the quick characteristics of response, further promotes proximity sensor's detection effect.
Based on the proximity sensor provided above, the embodiment of the present disclosure further provides a terminal device including the proximity sensor. Wherein, terminal equipment can be selected to be cell-phone, panel computer, wearing equipment (intelligent bracelet, intelligent wrist-watch etc.), on-vehicle equipment or medical equipment.
Fig. 5 is a schematic structural diagram of a terminal device shown according to an exemplary embodiment. As shown in fig. 5, the terminal device includes: a proximity sensor 100, a processor 200, and a display screen (not shown). The processor 200 is connected to the proximity sensor 100 for controlling the emitters in the proximity sensor 100 to emit the detection infrared rays.
Specifically, the driving member 111 and the light emitting member 112 of the transmitter are connected by the switch member 113. The processor 200 is connected to the driving member 111, and the processor 200 is connected to the switching member 113. Accordingly, the processor 200 controls the driving signal with the set number of pulses and the set current magnitude outputted from the driving member 111. That is, the processor 200 regulates the magnitude and duty cycle of the driving signal output by the driving member 111. The processor 200 controls the conduction of the driving member 111 and the light emitting member 112 through the switch member 113, so that the light emitting member 112 outputs the infrared detection signal in a pulse form.
In the embodiment of the present disclosure, the display screen is disposed above the proximity sensor 100, and a portion of the display screen corresponding to the proximity sensor is used for displaying an image.
And, the wavelength of the detection infrared light outputted from the light emitting member 112 is greater than 1300 nm. At this time, the detection infrared light does not excite the pixels in the display screen to emit light. Namely, the infrared light with the wavelength larger than 1300nm can avoid the occurrence of screen bright spots and ensure the display effect of the display screen.
Under the condition that the detected infrared ray with the wavelength more than 1300nm is invisible light and does not cause bright spots on the screen. The processor 200 may also control the proximity sensor 100 to emit a detected infrared light when the display screen pixels are illuminated. That is, the pixels in the display screen and the light emitting elements in the proximity sensor 100 may operate simultaneously. In this way, the difficulty of drive control of the proximity sensor is reduced.
With continued reference to fig. 5, the processor 200 is also coupled to the signal processing component 122 in the receiver, and receives the detection signal output by the signal processing component. The processor 200 is further configured to determine that the target object is in proximity to the terminal device in response to the detection signal being greater than or equal to the proximity threshold.
Based on the above description of the principle of the proximity sensor, the detection signal is obtained based on the pyroelectric signal, and reflects the energy of the detection infrared light reflected by the target object. In turn, the detection signal can be indicative of the distance of the target object from the proximity sensor.
Fig. 6 is a diagram illustrating correspondence between detection signals and distances from target objects to terminal devices according to an exemplary embodiment. In one embodiment, the detection signal output by the proximity sensor has a maximum value of 255 and a minimum value of 0. As shown in fig. 6, within a certain range, the closer the target object is to the terminal device, the larger the proximity sensor outputs the detection signal.
Therefore, in the embodiment of the present disclosure, when the detection signal is detected to be greater than or equal to the approach threshold, the processor 200 determines that the target object is close to the terminal device, and then triggers a response operation (for example, turns off the touch function of the touch screen). When detecting that the detection signal is smaller than or equal to the far threshold, the processor 200 determines that the target object is far away from the terminal device, and then the contact affects the operation (for example, a touch function of a touch screen is turned on).
Wherein, the approaching threshold and the departing threshold are set according to the use requirement. For example, the approach threshold is a value of a corresponding detection signal when the distance from the target object to the terminal device is 3 cm; the distance threshold is a value of a corresponding detection signal when the distance from the target object to the terminal device is 5 cm.
In one embodiment, the reference end 1212 of the temperature sensing element 121 of the proximity sensor 100 is located away from the display screen within the terminal device. In this manner, the temperature around reference end 1212 is kept relatively constant. Accordingly, the detection signal outputted from the reference terminal 1212 accurately reflects the energy of the detected infrared light absorbed by the measurement terminal 1211, thereby improving the detection accuracy of the proximity sensor.
Through the terminal equipment provided by the embodiment of the disclosure, the approach of an external target object to a display screen can be quickly and accurately detected through the proximity sensor. And, this terminal equipment can realize comprehensive screen display effect, need not to set up on the display screen with proximity sensor complex light trap.
Further, fig. 7 is a block diagram of a terminal device provided according to an example embodiment. As shown in fig. 7, in the embodiment of the present disclosure, the terminal device 700 may further include one or more of the following components: a processing component 702, a memory 704, a power component 706, a multimedia component 708, an audio component 710, an input/output (I/O) interface 712, a sensor component 714, a communication component 716, and an image capture component.
The processing component 702 generally refers to the overall operation of the terminal device 700, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 702 may include one or more processors 720 to execute instructions. Further, the processing component 702 may include one or more modules that facilitate interaction between the processing component 702 and other components. For example, the processing component 702 may include a multimedia module to facilitate interaction between the multimedia component 708 and the processing component 702.
The memory 704 is configured to store various types of data to support operations at the terminal device 700. Examples of such data include instructions for any application or method operating on terminal device 700, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 704 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
The power component 706 provides power to the various components of the terminal device 700. The power components 706 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the terminal device 700.
The multimedia component 708 comprises a display screen providing an output interface between the terminal device 700 and the target object. In some embodiments, the display screen includes a display component and a touch panel, in this way, the display screen may be implemented as a touch screen to receive input signals from a target object. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation.
The audio component 710 is configured to output and/or input audio signals. For example, the audio component 710 includes a Microphone (MIC) configured to receive an external audio signal when the terminal device 700 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal may further be stored in the memory 704 or transmitted via the communication component 716. In some embodiments, audio component 710 also includes a speaker for outputting audio signals.
The I/O interface 712 provides an interface between the processing component 702 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc.
The communication component 716 is configured to facilitate wired or wireless communication between the terminal device 700 and other devices. The terminal device 700 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 716 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 716 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the terminal device 700 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), programmable logic devices (P L D), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.
In an exemplary embodiment, the disclosed embodiment also provides a readable storage medium, and the readable storage medium stores executable instructions. The executable instructions may be executed by a processor of the terminal device. The readable storage medium may be, among others, ROM, Random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like.
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.
Claims (11)
1. A proximity sensor, characterized in that the proximity sensor comprises:
a transmitter for transmitting detection infrared light; and
a receiver comprising at least one temperature sensing element and a signal processing assembly;
the at least one temperature sensing element is used for sensing the detected infrared light reflected by the target object to output a thermoelectric signal;
the signal processing assembly is connected with the at least one temperature sensing piece and used for outputting a detection signal according to the thermoelectric signal.
2. The proximity sensor of claim 1, wherein the temperature sensing element comprises: a measurement end and a reference end;
the measuring end is induced by the detection infrared light reflected by the target object, so that the reference end outputs a thermoelectric signal.
3. The proximity sensor of claim 2, wherein the temperature sensing element includes a first conductor and a second conductor, the first conductor and the second conductor being of different materials;
the measuring end is formed at the joint of the first conductor and the second conductor,
the free ends of the first and second conductors form the reference terminal.
4. The proximity sensor of claim 1, wherein the receiver comprises at least two of the temperature sensing elements in series.
5. The proximity sensor of claim 1, wherein the signal processing assembly comprises:
the signal amplification circuit is connected with at least one temperature sensing piece and used for converting the thermoelectric signal into an amplified signal; and
and the analog-to-digital conversion circuit is connected with the signal amplification circuit and is used for converting the amplified signal into the detection signal.
6. The proximity sensor of claim 1, wherein the wavelength of the detected infrared light is greater than or equal to 1300 nm.
7. The proximity sensor of claim 6, wherein the transmitter comprises: the driving piece is used for driving the light emitting piece to output the detection infrared light.
8. A terminal device, characterized in that the terminal device comprises: a processor, and the proximity sensor of any one of claims 1-7;
and the processor is connected with the proximity sensor and used for controlling the emitter to emit and detect infrared rays and determining the distance from a target object to the terminal equipment according to a detection signal output by the proximity sensor.
9. The proximity sensor according to claim 8, wherein the processor is connected to a signal processing component in the receiver, and receives the detection signal outputted from the signal processing component;
and the processor determines that a target object is close to the terminal device in response to the detection signal being greater than or equal to a proximity threshold.
10. The proximity sensor of claim 8, wherein the emitter includes a driving member and a light emitting member;
the processor is further connected with the driving piece and used for controlling the emitting piece to output the detection infrared light, and the wavelength of the detection infrared light is larger than 1300 nm.
11. The proximity sensor according to claim 8, wherein the terminal device further comprises: the display screen is arranged above the proximity sensor, and the part of the display screen corresponding to the proximity sensor is used for displaying images.
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