CN108614651B - Mobile terminal and infrared detection method - Google Patents
Mobile terminal and infrared detection method Download PDFInfo
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- CN108614651B CN108614651B CN201810353399.XA CN201810353399A CN108614651B CN 108614651 B CN108614651 B CN 108614651B CN 201810353399 A CN201810353399 A CN 201810353399A CN 108614651 B CN108614651 B CN 108614651B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
- G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
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Abstract
The invention provides a mobile terminal and an infrared detection method, wherein the mobile terminal comprises a display screen, an infrared transmitting tube and an infrared receiving tube, the infrared transmitting tube is arranged at one end of the display screen, the infrared receiving tube is arranged at the other end of the display screen, first infrared light emitted by the infrared transmitting tube is transmitted to the outside of the mobile terminal through the display screen, the infrared receiving tube receives second infrared light through the display screen, and the second infrared light is infrared light obtained by reflecting the first infrared light by an object outside the mobile terminal. The mobile terminal in the embodiment of the invention can realize the infrared detection function without independently arranging an infrared emission hole on the display screen of the mobile terminal, and also improves the utilization rate of the display screen.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a mobile terminal and an infrared detection method.
Background
With the rapid development of mobile terminals, mobile terminals have become an essential tool in people's life, and bring great convenience to various aspects of users' life. For example: the display screen of the mobile terminal is generally provided with the infrared sensor, and when the mobile terminal is detected to be close to a human body, the display screen of the mobile terminal is extinguished, so that the mobile terminal can be prevented from being triggered by mistake. However, in the prior art, an infrared emission hole is usually arranged on a display screen of the mobile terminal separately for realizing the infrared detection function, but the arrangement of the infrared emission hole will make the utilization rate of the display screen lower, and the manufacturing difficulty of the display screen is increased, so that a scheme for realizing the infrared detection without separately arranging the infrared emission hole on the display screen is urgently needed.
Disclosure of Invention
The embodiment of the invention provides a mobile terminal and an infrared detection method, which aim to solve the problem that infrared detection can be realized only by independently arranging an infrared emission hole on a display screen in the prior art.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a mobile terminal, where the mobile terminal includes a display screen, an infrared transmitting tube and an infrared receiving tube, the infrared transmitting tube is disposed at one end of the display screen, the infrared receiving tube is disposed at the other end of the display screen, a first infrared light emitted by the infrared transmitting tube is transmitted to the outside of the mobile terminal through the display screen, the infrared receiving tube receives a second infrared light through the display screen, and the second infrared light is an infrared light obtained by reflecting the first infrared light by an object outside the mobile terminal.
In a second aspect, an embodiment of the present invention further provides an infrared detection method, which is applied to a mobile terminal, where the mobile terminal includes a display screen, an infrared transmitting tube and an infrared receiving tube, the infrared transmitting tube is disposed at one end of the display screen, and the infrared receiving tube is disposed at the other end of the display screen;
the method comprises the following steps:
detecting an infrared emission signal emitted by the infrared emission tube;
detecting an infrared receiving signal received by the infrared receiving tube through the display screen;
and determining that the foreign object is in a close or far state according to the infrared emission signal and the infrared receiving signal.
In a third aspect, an embodiment of the present invention further provides another infrared detection method, which is applied to a mobile terminal, where the mobile terminal includes a display screen, an infrared transmitting tube and an infrared receiving tube, the infrared transmitting tube is disposed at one end of the display screen, and the infrared receiving tube is disposed at the other end of the display screen; the mobile terminal also comprises a bottom noise filtering circuit, a pulse signal processing circuit and a controller, wherein the bottom noise filtering circuit is connected with the infrared receiving tube, and the pulse signal processing circuit is connected with the infrared receiving tube;
the method comprises the following steps:
controlling at least one part of the display screen to be switched between a first display state and a second display state through the controller, so that the first infrared light forms pulse infrared light; when the display screen is in a first display state, the first infrared light can be transmitted to the outside of the mobile terminal through the display screen, and when the display screen is in a second display state, the infrared light cannot be transmitted to the outside of the mobile terminal through the display screen;
controlling the bottom noise filtering circuit to filter the direct current signal output by the infrared receiving tube;
controlling the pulse signal processing circuit to process a pulse signal output by the infrared receiving tube after receiving second infrared light through the display screen;
and determining that the foreign object is in a close or far state according to the pulse signal.
The mobile terminal provided by the embodiment of the invention comprises a display screen, an infrared transmitting tube and an infrared receiving tube, wherein the infrared transmitting tube is arranged at one end of the display screen, the infrared receiving tube is arranged at the other end of the display screen, first infrared light emitted by the infrared transmitting tube is transmitted to the outside of the mobile terminal through the display screen, the infrared receiving tube receives second infrared light through the display screen, and the second infrared light is infrared light obtained by reflecting the first infrared light by an object outside the mobile terminal. Through the setting, locate the one end of display screen with infrared emission tube, the other end of display screen is located to infrared receiving tube, can realize infrared detection function through the first infrared light of transmission and received second infrared light, like this, can be so that need not set up infrared emission hole alone on mobile terminal's display screen, can realize infrared detection function, and still improve the utilization ratio of display screen.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a diagram illustrating a positional relationship between a display screen and an infrared sensor in a mobile terminal according to an embodiment of the present invention;
fig. 2 is a structural diagram of a bottom noise filtering circuit in a mobile terminal according to an embodiment of the present invention;
fig. 3 is a flowchart of an infrared detection method according to an embodiment of the present invention;
FIG. 4 is a flow chart of another method for infrared detection according to an embodiment of the present invention;
fig. 5 is an application scenario diagram of a mobile terminal according to an embodiment of the present invention;
fig. 6 is a structural diagram of a display screen in another mobile terminal according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a hardware structure of another mobile terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a mobile terminal, as shown in fig. 1-2, the mobile terminal comprises a display screen 1, an infrared transmitting tube 2 and an infrared receiving tube 3, the infrared transmitting tube 2 is arranged at one end of the display screen 1, the infrared receiving tube 3 is arranged at the other end of the display screen 1, first infrared light emitted by the infrared transmitting tube 2 is transmitted to the outside of the mobile terminal through the display screen 1, the infrared receiving tube 3 receives second infrared light through the display screen 1, and the second infrared light is infrared light obtained by reflecting the first infrared light by an object outside the mobile terminal.
The display screen 1, the infrared transmitting tube 2 and the infrared receiving tube 3 may be each component of a whole infrared detection module, and of course, may also be each independent component.
The infrared light received by the infrared receiving tube 3 includes two parts, one part is emitted by the infrared emitting tube 2 and reaches the emitting light of the infrared receiving tube 3 through the display screen 1, and the other part is the reflected light which is emitted to the outside through the display screen 1, reflected back to the display screen 1 through the outside and received by the infrared receiving tube 3. Specifically, the infrared light emitted from the infrared emission tube 2 may include first infrared light emitted to the outside through the display screen 1, and direct-current infrared light directly conducted to the infrared reception tube 3 through the display screen 1. The first infrared light emitted to the outside includes second infrared light reflected back to the display screen 1 via the outside and then received by the infrared receiving tube 3. The mobile terminal can detect the distance between the mobile terminal and the obstacle according to the amount of the second infrared light, so that the infrared detection function is realized. It should be noted that, the direct current infrared light emitted by the infrared emission tube 2 and directly transmitted to the infrared receiving tube 3 through the display screen 1 may cause an error in the infrared detection result of the mobile terminal, but the error is small. In addition, the mobile terminal may further implement an infrared detection function by comparing a difference between the amount of the first infrared light emitted and the amount of the second infrared light received, for example: if the quantity difference value of the first infrared light and the second infrared light is larger than a preset value, it is indicated that the foreign object is far away from the mobile terminal; and if the difference value of the first infrared light and the second infrared light is smaller than or equal to a preset value, indicating that the foreign object is closer to the mobile terminal. It should be noted that specific values of the preset values are not limited herein, for example: the preset value may be 3 units or 5 units, etc.
Specifically, as shown in fig. 1, a position relationship diagram of a display screen 1, an infrared transmitting tube 2 and an infrared receiving tube 3 in a mobile terminal according to an embodiment of the present invention is provided. The infrared emitting tube 2 may be an infrared Light Emitting Diode (LED). The infrared transmitting tube 2 and the infrared receiving tube 3 may be respectively disposed at two opposite ends of the display screen 1, and of course, the infrared transmitting tube 2 and the infrared receiving tube 3 may also be disposed at two adjacent sides of the display screen 1. For example: if the display screen 1 is a rectangular display screen, the infrared transmitting tube 2 and the infrared receiving tube 3 can be respectively arranged on two opposite sides of the rectangular display screen, and also can be respectively arranged on two adjacent sides of the rectangular display screen.
The mobile terminal provided by the embodiment of the invention comprises a display screen, an infrared transmitting tube and an infrared receiving tube, wherein the infrared transmitting tube is arranged at one end of the display screen, the infrared receiving tube is arranged at the other end of the display screen, first infrared light emitted by the infrared transmitting tube is transmitted to the outside of the mobile terminal through the display screen, the infrared receiving tube receives second infrared light through the display screen, and the second infrared light is infrared light obtained by reflecting the first infrared light by an object outside the mobile terminal. Through the setting, locate the one end of display screen with infrared emission tube, the other end of display screen is located to infrared receiving tube, can realize infrared detection function through the first infrared light of transmission and received second infrared light, like this, can be so that need not set up infrared emission hole alone on mobile terminal's display screen, can realize infrared detection function, and still improve the utilization ratio of display screen.
Optionally, the mobile terminal further includes a controller, where the controller is configured to control the display screen 1 to be in a first display state, and when the display screen 1 is in the first display state, the first infrared light is transmitted to the outside of the mobile terminal through the display screen 1.
When the display screen 1 is in the first display state, that is, a white frame picture or a silver frame picture and the like are displayed on the display screen 1, the first infrared light can be more conveniently transmitted to the outside of the mobile terminal through the display screen 1.
In the embodiment of the invention, the controller is used for controlling the display screen to be in the first display state, so that the first infrared light can be more conveniently transmitted to the outside of the mobile terminal through the display screen, and the transmission efficiency of the first infrared light is improved.
Optionally, the mobile terminal further includes a bottom noise filtering circuit and a pulse signal processing circuit, where the bottom noise filtering circuit is connected to the infrared receiving tube 3 and is configured to filter a direct current signal output by the infrared receiving tube 3;
the controller is used for controlling at least one part of the display screen 1 to be switched between the first display state and the second display state so as to enable the first infrared light to form pulse infrared light; when the display screen 1 is in the second display state, the infrared light emitted by the infrared emission tube 2 cannot be transmitted to the outside of the mobile terminal through the display screen 1; i.e. the display screen 1 is shielded from infrared light.
The pulse signal processing circuit is connected with the infrared receiving tube 3 and is used for processing a pulse signal output by the infrared receiving tube 3 after receiving second infrared light through the display screen 1.
When the display screen 1 is in the first display state, the display screen 1 may display a first frame, and at this time, the infrared light may be transmitted to the outside of the mobile terminal through the display screen 1, and the first frame may be a white frame, or the like, and when the display screen 1 is in the second display state, the display screen 1 may display a second frame, and at this time, the infrared light may not be transmitted to the outside of the mobile terminal through the display screen 1, and the second frame may be a black frame, or a dark gray frame, or the like. In addition, the display panel 1 may alternately display the first frame picture and the second frame picture, or may display the first frame picture and the second frame picture in combination, for example: the cycle display was performed in the following manner: firstly, displaying two frames of first frame pictures, and then displaying one frame of second frame pictures; or the second frame of the two frames is displayed first, and then the first frame of the one frame is displayed. It should be noted that, when the display panel 1 is in the first display state and the second display state respectively, the type of the picture displayed by the display panel 1 is not limited herein, and the mode of the display panel 1 for displaying the picture is not limited.
Wherein, the infrared light received by the infrared receiving tube 3 at this time includes: direct current infrared light which is emitted from the infrared emission tube 2 and is directly transmitted to the infrared receiving tube 3 through the display screen 1 of the mobile terminal; the second infrared light that is emitted back to the display screen 1 through the outside and then received by the infrared receiving tube 3 is also pulse infrared light at this time. The signal output by the infrared receiving tube 3 includes a direct current signal and a pulse signal, wherein the direct current signal is obtained by converting direct current infrared light, and the pulse signal is obtained by converting second infrared light.
It should be noted that the display screen 1, the ground noise filtering circuit, the pulse signal processing circuit and the controller may form an infrared detection module, and of course, the infrared detection module may further include an infrared transmitting tube 2 and an infrared receiving tube 3. In addition, the display screen 1, the bottom noise filtering circuit, the pulse signal processing circuit, the controller, the infrared transmitting tube 2 and the infrared receiving tube 3 can also be independent devices in the mobile terminal.
The working principle of this embodiment may be as follows: the controller may be configured to control a portion of the display panel 1 to switch between a first display state and a second display state, for example, the controller may be configured to control the portion of the display panel 1 to alternately display a first frame picture and a second frame picture, where the first frame picture may be a black frame picture, and the second frame picture may be a white frame picture, and when the first frame picture is the black frame picture and the second frame picture is the white frame picture, the controller controls the portion of the display panel 1 of the mobile terminal to alternately display the white frame picture and the black frame picture, and at this time, the infrared light emitted by the infrared emission tube 2 may be transmitted out of the display panel 1 when the display panel 1 displays the white frame picture, and the infrared light transmitted out of the display panel 1 is pulse infrared light when the display panel 1 displays the black frame picture, and the first infrared light transmitted out of the display panel 1 is not transmitted out of the display panel 1. The pulse infrared light transmitted out of the display screen 1 when encountering an obstacle returns to the display screen 1 and then a part of the pulse infrared light received by the infrared receiving tube 3 is second infrared light, the second infrared light is also pulse infrared light, the second infrared light can be converted into a pulse signal in the infrared receiving tube 3, the bottom noise filtering circuit can directly filter a direct current signal output by the infrared receiving tube 3, so that the interference of the direct current signal on the processing of the pulse signal is reduced, and the pulse signal processing circuit processes the pulse signal, for example: when the pulse signal undersize at the first moment, the pulse signal processing circuit carries out operations such as integration or amplification on the pulse signal in a period of time including the first moment, so that the judgment of the size of the pulse signal is more convenient, the transmission of the pulse signal in the mobile terminal is more convenient, the distance from the mobile terminal to an obstacle can be detected by detecting the size of the pulse signal processed by the pulse signal processing circuit at the moment, and the infrared detection function is completed.
When the distance between the mobile terminal and the obstacle (usually a human body) is a first value, the amount of the second infrared light received by the infrared receiving tube 3 of the mobile terminal is a second value, and the infrared receiving tube 3 can convert and output the second infrared light according to the second value to obtain a pulse signal with a third value. Note that the first value may be 3 cm, 4 cm, or 5 cm, or the like. In addition, the specific magnitude of the third numerical value is not limited herein, but the third numerical value, the second numerical value and the first numerical value may be in one-to-one correspondence. For example: when the first value is 3 cm, the second value may be 2 units of the second infrared light, and the third value may be 0.005 microampere; when the first value is 4 cm, the second value may be 1 unit of the second infrared light, and the third value may be 0.004 microampere. The third value may be generated directly at the beginning of the use of the mobile terminal, or may be adjusted during the use according to the actual use condition. Note that the closer the mobile terminal is to the obstacle, the larger the value of the pulse signal output from the infrared receiver tube 3 becomes.
In addition, it should be noted that, in order to better distinguish the pulse signal from the dc signal, the dc signal may be filtered by a noise-floor filtering circuit, only the pulse signal is obtained, and the distance between the mobile terminal and the human body is detected according to the magnitude of the pulse signal.
The display screen 1 may include a first area, where the first area is a light transmission area for infrared light from an infrared transmitting tube 2 to an infrared receiving tube 3 of the mobile terminal; the controller can control the first area to switch between the first display state and the second display state, so that the first infrared light emitted outwards through the first area forms pulse infrared light. Referring to fig. 1 and 6, an infrared transmitting tube 2 and an infrared receiving tube 3 may be disposed below the first region 601 in fig. 6. It should be noted that the first area 601 may be switched between the first display state and the second display state, and other areas except the first area 601 on the display screen may be only in the first display state or the second display state, specifically, the first area 601 may display the first frame picture and the second frame picture in combination, and other areas except the first area 601 on the display screen may only display the first frame picture. In this embodiment, the controller may control the first area to display by combining the first frame picture and the second frame picture, so that the first infrared light emitted outwards through the first area forms pulsed infrared light, thereby avoiding that all the display screens 1 are used for displaying the first frame picture and the second frame picture in combination, and thus, energy consumed by all the display screens 1 for displaying the first frame picture and the second frame picture in combination is preferably reduced, and accordingly, the service life of the display screens 1 is prolonged.
The mobile terminal provided by the embodiment of the invention further comprises a bottom noise filtering circuit and a pulse signal processing circuit, wherein the bottom noise filtering circuit is connected with the infrared receiving tube, and the pulse signal processing circuit is connected with the infrared receiving tube. Through the arrangement, the controller is used for controlling at least one part of the display screen to be switched between the first display state and the second display state, so that the first infrared light which penetrates through the display screen and is emitted to the outside of the mobile terminal forms pulse infrared light, the pulse infrared light can return to the infrared receiving tube when encountering obstacles, the infrared detection function is realized, and the infrared detection function can be realized without independently arranging an infrared emission hole on the display screen of the mobile terminal.
Optionally, the display screen 1 includes a liquid crystal layer, a light guide plate and a reflection plate which are sequentially stacked, and further includes a light emitting source 4 connected to the light guide plate, and the infrared emission tube 2 is connected to the light guide plate.
The light source 4 may be a white LED light bar, or of course, the white LEDs may be connected in series to form the light source 4. In addition, light emitting source 4, infrared emission pipe 2 and infrared receiving tube 3 can all set up in the same one side of light guide plate, and light emitting source 4 can set up between infrared emission pipe 2 and infrared receiving tube 3, like this, need not set up the infrared emission hole alone on mobile terminal's display screen 1 to can enlarge the display area of display screen 1, of course, infrared emission pipe 2 and infrared receiving tube 3 also can set up in the different both sides of light guide plate. The specific arrangement is not limited herein.
Wherein, the width of the light emitting source 4 may be the same as the width of the area for displaying on the display screen 1 of the mobile terminal.
In the embodiment of the invention, the display screen comprises the liquid crystal layer, the light guide plate and the reflecting plate which are sequentially stacked, and also comprises the light source connected with the light guide plate, infrared light emitted by the infrared emission tube can be conducted along the light guide plate, and the infrared light can be reflected out of the display screen through the reflecting plate, so that the transmission effect on the infrared light can be better by arranging the liquid crystal layer, the light guide plate and the reflecting plate.
Optionally, the mobile terminal further includes an Application Specific Integrated Circuit (ASIC), one end of the ASIC is connected to the pulse signal processing circuit, and the other end of the ASIC is connected to the light emitting source 4; the ASIC is used for detecting whether the numerical value of the pulse signal output by the infrared receiving tube 3 is larger than a preset numerical value or not under the condition that the luminous source 4 is in a luminous state; if the value of the pulse signal is detected to be greater than the preset value, the ASIC controls the light-emitting source 4 to be turned off.
The value of the preset value may be 0.01 microampere, 0.05 microampere, or 0.10 microampere, and the specific value is not limited herein. The value of the preset value can be automatically obtained at the beginning of the use of the mobile terminal, and can also be adjusted along with the adjustment operation of the user. In addition, when the pulse signal processing circuit includes an analog-to-digital converter, the ASIC may be connected to the analog-to-digital converter. It should be noted that the ASIC may be a separate device in the mobile terminal.
In the embodiment of the invention, when the ASIC detects that the numerical value of the pulse signal output by the infrared receiving tube is larger than the preset numerical value, the distance between the mobile terminal and the barrier is relatively short, and the ASIC controls the luminous source to be closed, even if the mobile terminal is in a screen-off state, so that the electric quantity loss of the mobile terminal is reduced, the phenomenon that a user triggers the display screen by mistake can be reduced, and the mobile terminal is more intelligent.
Optionally, the bottom noise filtering circuit includes a dc absorber 6 having one end connected to the infrared receiving tube 3 and the other end grounded.
The direct current absorber 6 may be a current cell, and the direct current absorber 6 may pass a direct current signal. One end of the direct current absorber 6 is connected with the output end of the infrared receiving tube 3, and the other end of the direct current absorber 6 is grounded, so that the direct current signal output by the infrared receiving tube 3 can be absorbed.
In the embodiment of the invention, the bottom noise filtering circuit comprises the direct current absorber which can absorb the direct current signal output by the infrared receiving tube, and the influence of the direct current signal on the judgment result can be reduced when the numerical value of the pulse signal is judged to reach the preset numerical value.
Optionally, the pulse signal processing circuit includes a capacitor 5 and an analog-to-digital converter, where one end of the capacitor 5 is connected to the infrared receiving tube 3, and the other end is connected to the analog-to-digital converter.
The specification of the capacitor 5 may be designed according to the actual needs of the mobile terminal, and the specification of the capacitor 5 is not particularly limited. For example: the capacitor 5 may be a 10 microfarad capacitor. In addition, the analog-to-digital converter can convert the pulse signal into a digital signal, so that the transmission in the mobile terminal is facilitated.
In the embodiment of the invention, the signal output by the infrared receiving tube comprises two parts, wherein one part is an alternating current signal, and the other part is a direct current signal. The bottom noise filtering circuit comprises a capacitor, and due to the function of 'alternating current and direct current resistance' of the capacitor, the pulse signal output by the infrared receiving tube can be selected, so that the interference of the direct current signal can be reduced when the numerical value of the pulse signal is judged to reach the preset numerical value.
Optionally, the pulse signal processing circuit further includes an amplifier 7, and the amplifier 7 is connected in series between the capacitor 5 and the analog-to-digital converter.
The infrared receiving tube 3 receives a small amount of pulsed infrared light at a certain time, which results in a small converted pulse signal, for example: the pulse infrared light received at the first moment is small, so that the converted pulse signal is also small, the pulse signal at the first moment can be amplified through the amplifier 7, and then converted through the analog-digital converter, and further transmission is facilitated.
In the embodiment of the invention, the bottom noise filtering circuit also comprises an amplifier which can be amplified when the pulse signal output by the infrared receiving tube is smaller, so that the transmission of the pulse signal is more convenient.
Optionally, the pulse signal processing circuit further includes an integrator, and the integrator is connected in series between the capacitor 5 and the analog-to-digital converter.
The converted current signal is increased, a pulse signal in a period of time can be accumulated through the integrator, and then the pulse signal is converted through the analog-digital converter, so that the transmission is facilitated. The period of time is not limited herein, and may be, for example, 1 millisecond or 3 milliseconds.
In the embodiment of the present invention, the Mobile terminal may be a Mobile phone, a tablet personal Computer (tablet personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or the like.
In the embodiment of the invention, the bottom noise filtering circuit also comprises an integrator, and when the pulse signal output by the infrared receiving tube is smaller, the pulse signal received within a period of time can be accumulated, so that the transmission of the pulse signal is more convenient.
Optionally, the ASIC is further configured to: and under the condition that the light-emitting source 4 is in an off state, if the ASIC detects that the numerical value of the pulse signal output by the infrared receiving tube 3 is less than or equal to the preset numerical value, the ASIC controls the light-emitting source 4 to emit light.
In the embodiment of the invention, under the condition that the luminous source is in the off state, if the ASIC detects that the numerical value of the pulse signal output by the infrared receiving tube is less than or equal to the preset numerical value, the ASIC can judge that the mobile terminal is far away from the barrier at the moment, so that the luminous source can be controlled to emit light, and the display screen of the mobile terminal is in the on state.
Referring to fig. 3, fig. 3 is a flowchart of an infrared detection method according to an embodiment of the present invention. The method is applied to a mobile terminal, wherein the mobile terminal comprises a display screen, an infrared transmitting tube and an infrared receiving tube, the infrared transmitting tube is arranged at one end of the display screen, and the infrared receiving tube is arranged at the other end of the display screen; as shown in fig. 3, the method comprises the steps of:
The infrared emission signals emitted by the infrared emission tube are detected, and data such as the number and/or emission time of the infrared emission signals can be detected, which is not limited herein.
The display screen, the infrared transmitting tube and the infrared receiving tube can be parts of the whole infrared detection module, and can also be independent parts.
And 302, detecting an infrared receiving signal received by the infrared receiving tube through the display screen.
When detecting the infrared reception signal, the reception time and/or the reception number of the infrared reception signal may be detected.
The infrared light received by the infrared receiving tube comprises two parts, one part is second infrared light, and the other part is direct current infrared light, wherein the direct current infrared light is the infrared light which is emitted by the infrared emitting tube and is conducted into the infrared receiving tube through the display screen; the infrared light emitted by the infrared emission tube and emitted to the outside of the mobile terminal through the display screen is first infrared light, and the infrared light returning to the infrared receiving tube after the first infrared light meets the obstacle is second infrared light. The mobile terminal can detect the distance between the mobile terminal and the obstacle according to the amount of the second infrared light returning to the infrared receiving tube after encountering the obstacle, so that the infrared detection function is realized. It should be noted that, the direct current infrared light emitted by the infrared emission tube and transmitted to the infrared receiving tube through the display screen may cause an error in the infrared detection result of the mobile terminal, but the error is small.
And step 303, determining that the foreign object is in a close or far state according to the infrared emission signal and the infrared receiving signal.
In the above steps, the emitting time of the infrared emitting signal and the receiving time of the infrared receiving signal can be detected, the time interval between the emitting time and the receiving time is calculated, and the state that a foreign object is close to the mobile terminal or far away from the mobile terminal is determined according to the size of the time interval, so that the infrared ranging function is realized. For example: and if the time interval is less than 1 millisecond, judging that the foreign object is close to the mobile terminal, and if the time interval is more than 1 millisecond, judging that the foreign object is far from the mobile terminal. Of course, the infrared ranging function can also be realized according to the number of the infrared transmitting signals and the infrared receiving signals, for example: if the difference value between the quantity of the infrared transmitting signals and the quantity of the infrared receiving signals is larger, the fact that the foreign object is far away from the mobile terminal is indicated; and if the difference value between the quantity of the infrared emission signals and the quantity of the infrared receiving signals is smaller, the fact that the foreign object is closer to the mobile terminal is indicated.
In addition, the state that the foreign object is close to or far away from the mobile terminal can be judged according to the received infrared receiving signals. For example: if the received infrared receiving signal is greater than 10 units, the foreign object is judged to be close to the mobile terminal, and if the received infrared receiving signal is less than or equal to 10 units, the foreign object is judged to be far from the mobile terminal.
Optionally, step 303 may include:
when the difference value between the infrared emission signal and the infrared receiving signal is smaller than or equal to a preset value, the foreign object is in a close state;
and when the difference value between the infrared emission signal and the infrared receiving signal is greater than a preset value, the foreign object is in a far state.
It should be noted that specific values of the preset values are not limited herein, for example: the preset value may be 3 units or 5 units, etc.
In the embodiment, the difference value between the infrared emission signal and the infrared receiving signal is compared to judge whether the foreign object is in a close state or a far state, so that the judgment result of the mobile terminal is more visual and accurate.
In the embodiment of the invention, through the steps 301, 302 and 303, the condition that the foreign object is close to or far away from is determined according to the infrared emission signal and the infrared receiving signal, so that the infrared detection function can be realized without independently arranging an infrared emission hole on the display screen of the mobile terminal, and the utilization rate of the display screen is also improved.
Referring to fig. 4, fig. 4 is a flowchart of another infrared detection method provided in the embodiment of the present invention. The main differences between this embodiment and the previous embodiment are: according to the embodiment, the controller can control part of the display screen to be switched between the first display state and the second display state, so that the first infrared light forms pulse infrared light, and the infrared detection function is further realized according to the received pulse infrared light. The method is applied to a mobile terminal, wherein the mobile terminal comprises a display screen, an infrared transmitting tube and an infrared receiving tube, the infrared transmitting tube is arranged at one end of the display screen, and the infrared receiving tube is arranged at the other end of the display screen; as shown in fig. 4, the method comprises the steps of:
the controller controls at least one part of the display screen to be switched between a first display state and a second display state so that the first infrared light forms pulse infrared light, the pulse infrared light can return to the mobile terminal if meeting an obstacle and return to the infrared receiving tube through the display screen, and the pulse infrared light returning to the infrared receiving tube is the second infrared light. By detecting the magnitude of the second infrared light, the infrared detection function can be realized. Similarly, the emitting time of the pulse infrared light and the receiving time of the second infrared light can be detected, the time interval between the emitting time and the receiving time is calculated, and the state that a foreign object is close to the mobile terminal or far away from the mobile terminal is determined according to the size of the time interval, so that the infrared ranging function is realized. In addition. The magnitude of the number difference between the transmitted pulsed infrared light and the received second infrared light can be detected, so that the condition that the foreign object is close to the mobile terminal or far away from the mobile terminal can be determined.
The working principle of this embodiment may be as follows: the controller may control a portion of the display screen to switch between a first display state and a second display state, for example, the controller may control the portion of the display screen to alternately display a first frame picture and a second frame picture, where the first frame picture may be a black frame picture, and the second frame picture may be a white frame picture, and when the first frame picture is a black frame picture and the second frame picture is a white frame picture, the controller may control the portion of the display screen of the mobile terminal to alternately display the white frame picture and the black frame picture, and at this time, the infrared light emitted by the infrared emission tube may be transmitted out of the display screen when the display screen displays the white frame picture, and may not be transmitted out of the display screen when the display screen displays the black frame picture, and then the first infrared light transmitted out of the display screen forms pulse infrared light. The pulse infrared light transmitted out of the display screen returns to the display screen when encountering an obstacle, and then a part of the pulse infrared light received by the infrared receiving tube is second infrared light, so that the second infrared light is also pulse infrared light, and the second infrared light can be converted into a pulse signal in the infrared receiving tube, and the bottom noise filtering circuit can directly filter a direct current signal output by the infrared receiving tube, so that the interference of the direct current signal on the processing of the pulse signal is reduced, and the pulse signal processing circuit processes the pulse signal, for example: when the pulse signal undersize at the first moment, the pulse signal processing circuit carries out operations such as integration or amplification on the pulse signal in a period of time including the first moment, so that the judgment of the size of the pulse signal is more convenient, the transmission of the pulse signal in the mobile terminal is more convenient, the distance from the mobile terminal to an obstacle can be detected by detecting the size of the pulse signal processed by the pulse signal processing circuit at the moment, and the infrared detection function is completed.
The infrared light received by the infrared receiving tube comprises two parts, one part is pulse infrared light (namely second infrared light) which is returned to the infrared receiving tube through the display screen when meeting an obstacle, the pulse infrared light can be converted into a pulse signal, the other part is direct current infrared light which is emitted from the infrared emitting tube and reaches the infrared receiving tube through the display screen, and the direct current infrared light can be converted into a direct current signal.
In addition, referring to fig. 5, when the display screen of the mobile terminal is switched between the first display state and the second display state, the current signal output by the infrared receiving tube 3 of the mobile terminal may include two parts, namely a direct current signal and a pulse signal, and the current signal output by the infrared receiving tube 3 is converted according to the infrared light received by the infrared receiving tube 3, the infrared light received by the infrared receiving tube 3 may be divided into two types, namely a and B, where the type B infrared light is emitted by the infrared emitting tube 2 and transmits out the pulse infrared light formed by the display screen 1; the infrared light of A kind is direct current infrared light which is emitted by the infrared emission tube 2 and directly enters the infrared receiving tube 3 through the display screen 1. After B kinds of infrared light are transmitted out of the display screen, when the B kinds of infrared light meet an obstacle C (C is a human body generally), a transmission route is changed, the B kinds of infrared light return to the infrared receiving tube 3, the infrared receiving tube 3 receives the B kinds of infrared light and converts the B kinds of infrared light to obtain a pulse signal, and the A kinds of infrared light are received by the infrared receiving tube 3 and converted to obtain a direct current signal.
Optionally, the step of controlling, by the controller, at least a part of the display screen to switch between a first display state and a second display state, so that the first infrared light forms pulsed infrared light may include:
the controller controls the first area to be switched between a first display state and a second display state, so that the first infrared light transmitted to the outside of the mobile terminal through the first area forms pulse infrared light.
The first area is a light transmission area for transmitting infrared light from an infrared transmitting tube to an infrared receiving tube of the mobile terminal, please refer to fig. 6, and the infrared transmitting tube and the infrared receiving tube may be correspondingly disposed below the first area 601 in fig. 6. It should be noted that the first area 601 can be switched between the first display state and the second display state, and other areas except the first area 601 on the display screen can be only in the first display state or the second display state.
In the embodiment, the controller controls the first area to be switched between the first display state and the second display state, and controls other areas except the first area on the display screen to be only in the first display state or the second display state, and when the other areas are in the second display state, the other areas are in the screen-off state, so that the electric quantity loss of the mobile terminal can be reduced, the mobile terminal is more intelligent, and the use is more convenient.
And step 402, controlling the bottom noise filtering circuit to filter the direct current signal output by the infrared receiving tube.
The bottom noise filtering circuit can directly filter the direct current signal output by the infrared receiving tube, so that the interference of the direct current signal on the pulse signal processing is reduced.
And 403, controlling the pulse signal processing circuit to process the pulse signal output by the infrared receiving tube after receiving the second infrared light through the display screen.
Wherein, pulse signal processing circuit can amplify, operation such as integral or digital conversion to the pulse signal of infrared receiving tube output, like this, through enlargiing pulse signal or operation such as integral, can be so that judge more conveniently pulse signal's size, through turning into digital signal with pulse signal, can be so that pulse signal is more convenient at mobile terminal's inside transmission.
And step 404, determining that the foreign object is in a close or far state according to the pulse signal.
The number of the pulse signals can be detected to judge whether the foreign object is close to or far away from the infrared distance measuring device, so that the infrared distance measuring function is achieved. For example: and if the number of the detection pulse signals is greater than 10 units, judging that the foreign object is close to the mobile terminal, and if the number of the detection pulse signals is less than or equal to 10 units, judging that the foreign object is far from the mobile terminal. Of course, the criteria for judgment are not limited herein.
Optionally, the display screen includes a liquid crystal layer, a light guide plate, a reflective plate, and a light source connected to the light guide plate, and the infrared emission tube is connected to the light guide plate; after step 404, the method may further include the steps of:
under the condition that the luminous source is in a luminous state, detecting whether the numerical value of the pulse signal output by the infrared receiving tube is larger than a preset numerical value or not;
and if the numerical value of the pulse signal is detected to be larger than the preset numerical value, closing the luminous source.
The specific value of the preset value is not limited herein, and the preset value may be set before the mobile terminal leaves a factory, or may be automatically obtained from a server when the mobile terminal is enabled.
In the embodiment, when the value of the pulse signal output by the infrared receiving tube is detected to be larger than the preset value, the distance from the mobile terminal to the obstacle is short, and then the luminous source is closed, so that the mobile terminal is in a screen-off state, the electric quantity loss of the mobile terminal is reduced, and the mobile terminal is more intelligent.
Optionally, after the step of turning off the light source if the detected value of the pulse signal is greater than the preset value, the method further includes:
and if the numerical value of the pulse signal output by the infrared receiving tube is detected to be less than or equal to the preset numerical value, the luminous source is started.
Wherein, when the luminous source is turned off. The mobile terminal can also detect whether the numerical value of the pulse signal output by the infrared receiving tube is larger than a preset numerical value or not in real time, and if the numerical value of the pulse signal output by the infrared receiving tube is smaller than or equal to the preset numerical value, the light emitting source is started to emit light. It should be noted that, the real-time detection means that the mobile terminal can detect whether the value of the pulse signal output by the infrared receiving tube is greater than a preset value at intervals, and the interval is fixed, for example: may be 1 millisecond, 2 milliseconds, 3 milliseconds, etc. The specific structure is not limited herein.
In this embodiment, after the light emitting source goes out, and the numerical value of the pulse signal output by the infrared receiving tube is detected to be less than or equal to the preset numerical value, it can be determined that the distance between the obstacle and the mobile terminal is far, and then the light emitting source is turned on, so that the light emitting source emits light.
In the embodiment of the invention, the processor controls at least one part of the display screen to be switched between the first display state and the second display state, so that the first infrared light forms pulse infrared light, and the infrared detection function can be realized. Therefore, the scheme for realizing infrared detection without independently arranging the infrared emission hole on the display screen is provided.
Fig. 7 is a schematic diagram of a hardware structure of a mobile terminal implementing various embodiments of the present invention.
As shown in fig. 7, the mobile terminal 700 includes a Radio Frequency (RF) circuit 710, a memory 720, an input unit 730, a display unit 740, a processor 750, an audio circuit 760, a communication module 770, a power supply 780, a display screen, an infrared transmitting tube and an infrared receiving tube, where the infrared transmitting tube is disposed at one end of the display screen, the infrared receiving tube is disposed at the other end of the display screen, a first infrared light emitted by the infrared transmitting tube is transmitted to the outside of the mobile terminal 700 through the display screen, the infrared receiving tube receives a second infrared light through the display screen, and the second infrared light is an infrared light obtained by reflecting the first infrared light by an object outside the mobile terminal 700.
Optionally, the mobile terminal 700 further includes a controller, where the controller is configured to control the display screen to be in a first display state, and when the display screen is in the first display state, the first infrared light is transmitted to the outside of the mobile terminal 700 through the display screen.
Optionally, the mobile terminal 700 further includes a bottom noise filtering circuit and a pulse signal processing circuit, where the bottom noise filtering circuit is connected to the infrared receiving tube and is configured to filter a direct current signal output by the infrared receiving tube;
the controller is used for controlling at least one part of the display screen to be switched between a first display state and a second display state so as to enable the first infrared light to form pulse infrared light; when the display screen is in the second display state, infrared light cannot be transmitted to the outside of the mobile terminal 700 through the display screen;
the pulse signal processing circuit is connected with the infrared receiving tube and used for processing a pulse signal output by the infrared receiving tube after receiving the second infrared light through the display screen.
Optionally, the display screen includes liquid crystal layer, light guide plate and the reflecting plate that stack gradually the setting, still include with the light emitting source that the light guide plate is connected, infrared emission pipe with the light guide plate is connected.
Optionally, the mobile terminal 700 further includes an ASIC, where one end of the ASIC is connected to the pulse signal processing circuit, and the other end of the ASIC is connected to the light emitting source; the ASIC is used for detecting whether the numerical value of the pulse signal output by the infrared receiving tube is larger than a preset numerical value or not under the condition that the luminous source is in a luminous state; and if the ASIC detects that the value of the pulse signal is greater than the preset value, the ASIC controls the luminous source to be closed.
Optionally, the bottom noise filtering circuit includes a dc absorber having one end connected to the infrared receiving tube and the other end grounded.
Optionally, the pulse signal processing circuit includes a capacitor and an analog-to-digital converter, one end of the capacitor is connected to the infrared receiving tube, and the other end of the capacitor is connected to the analog-to-digital converter.
Optionally, the pulse signal processing circuit further includes an amplifier, and the amplifier is connected in series between the capacitor and the analog-to-digital converter.
Optionally, the pulse signal processing circuit further includes an integrator, and the integrator is connected in series between the capacitor and the analog-to-digital converter.
Optionally, the ASIC is further configured to: and under the condition that the luminous source is in an off state, if the ASIC detects that the numerical value of the pulse signal output by the infrared receiving tube is less than or equal to the preset numerical value, the ASIC controls the luminous source to emit light.
The input unit 730 may be used, among other things, to receive numeric or character information input by a user and to generate signal inputs related to user settings and function control of the mobile terminal 700. Specifically, in the embodiment of the present invention, the input unit 730 may include a touch panel 731. The touch panel 731, also referred to as a touch screen, can collect touch operations of a user (e.g. operations of the user on the touch panel 731 by using a finger, a stylus pen, or any other suitable object or accessory) thereon or nearby, and drive the corresponding connection device according to a preset program. Alternatively, the touch panel 731 may include two portions of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 750, and can receive and execute commands sent by the processor 750. In addition, the touch panel 731 may be implemented by various types, such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 731, the input unit 730 may include other input devices 732, and the other input devices 732 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like.
Among them, the display unit 740 may be used to display information input by the user or information provided to the user and various menu interfaces of the mobile terminal 700. The display unit 740 may include a display panel 741, and optionally, the display panel 741 may be configured in the form of an LCD or an organic light-emitting diode (OLED).
It should be noted that the touch panel 731 can cover the display panel 741 to form a touch display screen, and when the touch display screen detects a touch operation on or near the touch display screen, the touch display screen is transmitted to the processor 750 to determine the type of the touch event, and then the processor 750 provides a corresponding visual output on the touch display screen according to the type of the touch event.
The touch display screen comprises an application program interface display area and a common control display area. The arrangement modes of the application program interface display area and the common control display area are not limited, and can be an arrangement mode which can distinguish two display areas, such as vertical arrangement, left-right arrangement and the like. The application interface display area may be used to display an interface of an application. Each interface may contain at least one interface element such as an icon and/or widget desktop control for an application. The application interface display area may also be an empty interface that does not contain any content. The common control display area is used for displaying controls with high utilization rate, such as application icons like setting buttons, interface numbers, scroll bars, phone book icons and the like.
The processor 750 is a control center of the mobile terminal 700, connects various parts of the entire mobile phone using various interfaces and lines, and performs various functions of the mobile terminal 700 and processes data by operating or executing software programs and/or modules stored in the first memory 721 and calling data stored in the second memory 722, thereby integrally monitoring the mobile terminal 700. Alternatively, processor 750 may include one or more processing units.
The electronic device may include: at least one of a cell phone, a tablet, an e-book reader, an MP3 player, an MP4 player, a digital camera, a laptop, a car computer, a desktop computer, a set-top box, a smart tv, a wearable device.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (11)
1. A mobile terminal is characterized by comprising a display screen, an infrared transmitting tube and an infrared receiving tube, wherein the infrared transmitting tube is arranged at one end of the display screen, the infrared receiving tube is arranged at the other end of the display screen, first infrared light emitted by the infrared transmitting tube is transmitted to the outside of the mobile terminal through the display screen, the infrared receiving tube receives second infrared light through the display screen, and the second infrared light is infrared light obtained by reflecting the first infrared light by an object outside the mobile terminal; the mobile terminal also comprises a controller, a bottom noise filtering circuit and a pulse signal processing circuit, wherein the bottom noise filtering circuit is connected with the infrared receiving tube and is used for filtering direct current signals output by the infrared receiving tube;
the controller is used for controlling at least one part of the display screen to be switched between a first display state and a second display state so as to enable the first infrared light to form pulse infrared light; when the display screen is in the first display state, the first infrared light is transmitted to the outside of the mobile terminal through the display screen, and when the display screen is in the second display state, the infrared light cannot be transmitted to the outside of the mobile terminal through the display screen;
the pulse signal processing circuit is connected with the infrared receiving tube and used for processing a pulse signal output by the infrared receiving tube after receiving the second infrared light through the display screen.
2. The mobile terminal of claim 1, wherein the display comprises a liquid crystal layer, a light guide plate, and a reflective plate sequentially stacked, and further comprises a light emitting source connected to the light guide plate, and the infrared emission tube is connected to the light guide plate.
3. The mobile terminal of claim 2, further comprising an Application Specific Integrated Circuit (ASIC), one end of the ASIC being connected to the pulse signal processing circuit and the other end of the ASIC being connected to the light emitting source; the ASIC is used for detecting whether the numerical value of the pulse signal output by the infrared receiving tube is larger than a preset numerical value or not under the condition that the luminous source is in a luminous state; and if the ASIC detects that the value of the pulse signal is greater than the preset value, the ASIC controls the luminous source to be closed.
4. The mobile terminal of claim 1, wherein the noise floor filtering circuit comprises a dc absorber having one end connected to the infrared receiving tube and the other end grounded.
5. The mobile terminal of claim 1, wherein the pulse signal processing circuit comprises a capacitor and an analog-to-digital converter, one end of the capacitor is connected with the infrared receiving tube, and the other end of the capacitor is connected with the analog-to-digital converter.
6. The mobile terminal of claim 5, wherein the pulse signal processing circuit further comprises an amplifier connected in series between the capacitor and an analog-to-digital converter.
7. The mobile terminal of claim 5, wherein the pulse signal processing circuit further comprises an integrator connected in series between the capacitor and the analog-to-digital converter.
8. The mobile terminal of claim 3, wherein the ASIC is further configured to: and under the condition that the luminous source is in an off state, if the ASIC detects that the numerical value of the pulse signal output by the infrared receiving tube is less than or equal to the preset numerical value, the ASIC controls the luminous source to emit light.
9. An infrared detection method is characterized by being applied to a mobile terminal, wherein the mobile terminal comprises a display screen, an infrared transmitting tube and an infrared receiving tube, the infrared transmitting tube is arranged at one end of the display screen, and the infrared receiving tube is arranged at the other end of the display screen; the mobile terminal also comprises a bottom noise filtering circuit, a pulse signal processing circuit and a controller, wherein the bottom noise filtering circuit is connected with the infrared receiving tube, and the pulse signal processing circuit is connected with the infrared receiving tube;
the method comprises the following steps:
controlling at least one part of the display screen to be switched between a first display state and a second display state through the controller so that the first infrared light forms pulse infrared light; when the display screen is in a first display state, the first infrared light can be transmitted to the outside of the mobile terminal through the display screen, and when the display screen is in a second display state, the infrared light cannot be transmitted to the outside of the mobile terminal through the display screen;
controlling the bottom noise filtering circuit to filter the direct current signal output by the infrared receiving tube;
controlling the pulse signal processing circuit to process a pulse signal output by the infrared receiving tube after receiving second infrared light through the display screen;
and determining that the foreign object is in a close or far state according to the pulse signal.
10. The method of claim 9, wherein the display screen comprises a liquid crystal layer, a light guide plate and a reflective plate, which are sequentially stacked, and further comprises a light emitting source connected to the light guide plate, and the infrared emission tube is connected to the light guide plate; after the step of determining that the foreign object is in the approaching or departing state according to the pulse signal, the method further includes:
under the condition that the luminous source is in a luminous state, detecting whether the numerical value of the pulse signal output by the infrared receiving tube is larger than a preset numerical value or not;
and if the numerical value of the pulse signal is detected to be larger than the preset numerical value, closing the luminous source.
11. The method of claim 10, wherein after the step of turning off the light source if the value of the pulse signal is detected to be greater than the predetermined value, the method further comprises:
and if the numerical value of the pulse signal output by the infrared receiving tube is detected to be less than or equal to the preset numerical value, the luminous source is started.
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| CN201810353399.XA CN108614651B (en) | 2018-04-19 | 2018-04-19 | Mobile terminal and infrared detection method |
| PCT/CN2019/082048 WO2019201130A1 (en) | 2018-04-19 | 2019-04-10 | Mobile terminal and infrared detection method |
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| CN108614651B (en) * | 2018-04-19 | 2020-06-16 | 维沃移动通信有限公司 | Mobile terminal and infrared detection method |
| CN110865710B (en) * | 2019-11-19 | 2023-08-18 | Oppo（重庆）智能科技有限公司 | Terminal control method and device, mobile terminal and storage medium |
| CN111487635A (en) * | 2020-05-11 | 2020-08-04 | 苏州市运泰利自动化设备有限公司 | High-precision infrared dynamic infrared ranging system and method |
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