CN108614651B - A mobile terminal and infrared detection method - Google Patents

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

A mobile terminal and infrared detection method

technical field

The present invention relates to the field of communication technologies, in particular to a mobile terminal and an infrared detection method.

Background technique

With the rapid development of mobile terminals, mobile terminals have become an indispensable tool in people's lives, and have brought great convenience to all aspects of users' lives. For example, an infrared sensor is generally set on the display screen of the mobile terminal. When it is detected that the mobile terminal is close to the human body, the display screen of the mobile terminal is turned off, thereby preventing the mobile terminal from being triggered by mistake. However, in the prior art, an infrared emitting hole is usually set on the display screen of the mobile terminal to realize the infrared detection function. However, the setting of the infrared emitting hole will make the utilization rate of the display screen low, and at the same time increase the utilization rate of the display screen. It is difficult to manufacture, so there is an urgent need to provide a solution for realizing infrared detection without separately arranging infrared emission holes on the display screen.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a mobile terminal and an infrared detection method, so as to solve the problem in the prior art that infrared emission holes need to be separately arranged on the display screen to realize infrared detection.

In order to solve the above-mentioned technical problems, the present invention is achieved in this way:

In a first aspect, an embodiment of the present invention provides a mobile terminal. The mobile terminal includes a display screen, an infrared emitting tube, and an infrared receiving tube. The infrared emitting 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 first infrared light emitted by the infrared emission tube is transmitted to the outside of the mobile terminal through the display screen, and the infrared receiving tube receives the second infrared light through the display screen, The second infrared light is infrared light reflected by the first infrared light through an object other than 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. The mobile terminal includes a display screen, an infrared emission tube, and an infrared receiving tube, and the infrared emission tube is provided at one end of the display screen. , the infrared receiving tube is arranged at the other end of the display screen;

The method includes:

detecting the infrared emission signal emitted by the infrared emission tube;

Detecting the infrared receiving signal received by the infrared receiving tube through the display screen;

According to the infrared emission signal and the infrared reception signal, it is determined that the foreign object is in a state of approaching or moving away.

In a third aspect, the embodiments of the present invention further provide another infrared detection method, which is applied to a mobile terminal. The mobile terminal includes a display screen, an infrared emission tube, and an infrared receiving tube. One end, the infrared receiving tube is arranged at the other end of the display screen; the mobile terminal further includes a noise floor filtering circuit, a pulse signal processing circuit and a controller, the noise floor filtering circuit and the infrared receiving tube connection, the pulse signal processing circuit is connected with the infrared receiving tube;

The method includes:

At least a part of the display screen is controlled by the controller to switch between the first display state and the second display state, so that the first infrared light forms pulsed infrared light; wherein, when the display screen is in the 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 the second display state, the infrared light cannot be transmitted to the outside of the mobile terminal through the display screen;

controlling the noise floor filtering circuit to filter out the DC signal output by the infrared receiving tube;

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;

According to the pulse signal, it is determined that the foreign object is in a state of approaching or moving away.

The mobile terminal provided in the embodiment of the present invention includes a display screen, an infrared emitting tube and an infrared receiving tube. The infrared emitting 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 light is transmitted to the outside of the mobile terminal through the display screen, and the infrared receiving tube receives the second infrared light through the display screen, and the second infrared light is the infrared light after the first infrared light is reflected by objects outside the mobile terminal. Through the above arrangement, the infrared emitting tube is set at one end of the display screen, and the infrared receiving tube is set at the other end of the display screen, and the infrared detection function can be realized by the first infrared light emitted and the second infrared light received. In this way, The infrared detection function can be realized without separately setting the infrared emission hole on the display screen of the mobile terminal, and the utilization rate of the display screen is also improved.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

1 is a positional relationship diagram of a display screen and an infrared sensor in a mobile terminal provided by an embodiment of the present invention;

2 is a structural diagram of a noise floor filtering circuit in a mobile terminal provided by an embodiment of the present invention;

3 is a flowchart of an infrared detection method provided by an embodiment of the present invention;

4 is a flowchart of another infrared detection method provided by an embodiment of the present invention;

5 is an application scenario diagram of a mobile terminal provided by an embodiment of the present invention;

6 is a structural diagram of a display screen in another mobile terminal provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of a hardware structure of another mobile terminal provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

An embodiment of the present invention provides a mobile terminal. As shown in FIGS. 1-2 , the mobile terminal includes a display screen 1 , an infrared emission tube 2 and an infrared receiving tube 3 , and the infrared emission tube 2 is arranged on the display screen 1 . The infrared receiving tube 3 is arranged at the other end of the display screen 1, and the first infrared light emitted by the infrared emission tube 2 is transmitted to the outside of the mobile terminal through the display screen 1, and the infrared light is transmitted to the outside of the mobile terminal. The receiving tube 3 receives the second infrared light through the display screen 1 , and the second infrared light is the infrared light after the first infrared light is reflected by objects other than the mobile terminal.

Wherein, the display screen 1 , the infrared emission tube 2 and the infrared receiving tube 3 may be various components of an entire infrared detection module, and of course, may also be independent components.

Among them, the infrared light received by the infrared receiving tube 3 includes two parts, one part is emitted by the infrared transmitting tube 2 and reaches the emission light of the infrared receiving tube 3 through the display screen 1, and the other part is emitted to the outside world through the display screen 1, The outside is reflected back to the display screen 1, and the reflected light received by the infrared receiving tube 3. Specifically, the infrared light emitted by the infrared emitting tube 2 may include the first infrared light emitted to the outside through the display screen 1 , and the DC infrared light directly conducted to the infrared receiving tube 3 through the display screen 1 . The first infrared light emitted to the outside includes the second infrared light that is reflected back to the display screen 1 through 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 as to realize the function of infrared detection. It should be noted that the above-mentioned direct-current infrared light emitted by the infrared transmitting tube 2 and directly conducted to the infrared receiving tube 3 through the display screen 1 will cause a certain error in the infrared detection result of the mobile terminal, but the error is small. In addition, the mobile terminal can also implement the infrared detection function by comparing the difference in the quantity of the first infrared light emitted and the second infrared light received. For example, if the difference in quantity between the first infrared light and the second infrared light is greater than a predetermined If the value is set, it means that the foreign object is far away from the mobile terminal; if the difference in quantity between the first infrared light and the second infrared light is less than or equal to the preset value, it means that the foreign object is relatively close to the mobile terminal. It should be noted that the specific value of the preset value is not limited here, for example, the preset value may be 3 units or 5 units.

Specifically, as shown in FIG. 1 , it is a positional relationship diagram of a display screen 1 , an infrared emitting tube 2 , and an infrared receiving tube 3 in a mobile terminal provided by an embodiment of the present invention. The infrared emitting tube 2 can be an infrared light emitting diode (Light Emitting Diode, LED). The infrared emitting tube 2 and the infrared receiving tube 3 can be arranged on opposite ends of the display screen 1 respectively. Of course, the infrared emitting tube 2 and the infrared receiving tube 3 can also be arranged on the adjacent two sides of the display screen 1 . For example: if the display screen 1 is a rectangular display screen, the infrared emitting tube 2 and the infrared receiving tube 3 can be respectively arranged on the opposite sides of the rectangular display screen, or can be respectively arranged on the adjacent two sides of the rectangular display screen.

The mobile terminal provided by the embodiment of the present invention includes a display screen, an infrared emitting tube, and an infrared receiving tube. The infrared emitting 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. It is transmitted to the outside of the mobile terminal through the display screen, and the infrared receiving tube receives the second infrared light through the display screen, and the second infrared light is the infrared light after the first infrared light is reflected by objects outside the mobile terminal. Through the above arrangement, the infrared emitting tube is set at one end of the display screen, and the infrared receiving tube is set at the other end of the display screen, and the infrared detection function can be realized by the first infrared light emitted and the second infrared light received. In this way, The infrared detection function can be realized without separately setting the infrared emission hole on the display screen of the mobile terminal, and the utilization rate of the display screen is also improved.

Optionally, the mobile terminal further includes a controller, and the controller is used 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 passes through all the The display screen 1 is transmitted to the outside of the mobile terminal.

Wherein, when the display screen 1 is in the first display state, that is, a white frame picture or a silver frame picture is displayed on the display screen 1 , it is more convenient for the first infrared light to be transmitted to the outside of the mobile terminal through the display screen 1 .

In the embodiment of the present invention, the controller is used to control the display screen to be in the first display state, which can facilitate the transmission of the first infrared light to the outside of the mobile terminal through the display screen, thus improving the transmission efficiency of the first infrared light.

Optionally, the mobile terminal further includes a noise floor filtering circuit and a pulse signal processing circuit. The noise floor filtering circuit is connected to the infrared receiving tube 3 and is used to filter the DC output from the infrared receiving tube 3. Signal;

The controller is used to control at least a part of the display screen 1 to switch between the first display state and the second display state, so that the first infrared light forms pulsed infrared light; wherein, the display screen 1 is in any state. In the second display state, the infrared light emitted by the infrared emitting tube 2 cannot be transmitted to the outside of the mobile terminal through the display screen 1; that is, the display screen 1 shields the infrared light.

The pulse signal processing circuit is connected to the infrared receiving tube 3 for processing the pulse signal output by the infrared receiving tube 3 after receiving the second infrared light through the display screen 1 .

Wherein, when the display screen 1 is in the first display state, the display screen 1 may display the first frame, and the infrared light can be emitted to the outside of the mobile terminal through the display screen 1, and the first frame may be a white frame or Off-white frame images, etc., when the display screen 1 is in the second display state, the display screen 1 can display the second frame image. At this time, the infrared light cannot be transmitted to the outside of the mobile terminal through the display screen 1, and the second frame image can be Black frame picture or dark gray frame picture, etc. In addition, the display screen 1 can alternately display the first frame picture and the second frame picture, or can display the first frame picture and the second frame picture in combination. , and then display one frame of the second frame; or first display two frames of the second frame, and then display one frame of the first frame. It should be noted that, when the display screen 1 is in the first display state and the second display state respectively, the type of pictures displayed on the display screen 1 is not limited here, nor is the manner in which the display screen 1 displays pictures.

Among them, the infrared light received by the infrared receiving tube 3 at this time includes: the direct current infrared light emitted from the infrared transmitting tube 2 and directly conducted to the infrared receiving tube 3 through the display screen 1 of the mobile terminal; The second infrared light is then received by the infrared receiving tube 3, and at this time, the second infrared light is also pulsed infrared light. The signal output by the infrared receiving tube 3 includes a DC signal and a pulse signal, wherein the DC signal is obtained by converting the DC infrared light, and the pulse signal is obtained by converting the second infrared light.

It should be noted that the display screen 1 , the noise floor filtering circuit, the pulse signal processing circuit and the controller can form an infrared detection module. Of course, the infrared detection module can also include an infrared transmitting tube 2 and an infrared receiving tube 3 . In addition, the display screen 1 , the noise floor filtering circuit, the pulse signal processing circuit, the controller, the infrared transmitting tube 2 and the infrared receiving tube 3 may also be independent devices in the mobile terminal.

The working principle of this embodiment may be as follows: the controller may be used to control a part of the display screen 1 to switch between the first display state and the second display state, for example, the controller may be used to control a part of the display screen 1 to alternately display the first frame picture and the second frame picture, and the first frame picture can be a black frame picture, the second frame picture can be a white frame picture, when the first frame picture is a black frame picture, and the second frame picture is a white frame picture, the controller Control part of the display screen 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 can transmit the display screen 1 when the display screen 1 displays the white frame picture, and display on the display screen 1. When the black frame picture cannot be transmitted through the display screen 1, the first infrared light transmitted through the display screen 1 is pulsed infrared light. The above-mentioned pulsed infrared light transmitted out of the display screen 1 will return to the display screen 1 and then received by the infrared receiving tube 3 when an obstacle is encountered. The part of the second infrared light is the second infrared light. The second infrared light can be converted into a pulse signal in the infrared receiving tube 3, and the noise floor filtering circuit can directly filter the DC signal output by the infrared receiving tube 3, thereby reducing the interference of the DC signal when processing the pulse signal, and the pulse signal processing The circuit processes the pulse signal. For example, when the pulse signal at the first moment is too small, the pulse signal processing circuit integrates or amplifies the pulse signal in a period of time including the first moment, so that it is more convenient to measure the size of the pulse signal. By detecting the size of the pulse signal processed by the pulse signal processing circuit at this time, the distance between the mobile terminal and the obstacle can be detected, thereby completing the infrared detection function.

Among them, when the distance between the mobile terminal and the obstacle (usually the human body) is the first value, the quantity of the second infrared light received by the infrared receiving tube 3 of the mobile terminal is the second value, and the infrared receiving tube 3 is based on the first value. The second infrared light with two values can be converted and output to obtain a pulse signal with a third value. It should be noted that the first value may be 3 cm, 4 cm, or 5 cm. In addition, the specific size of the third numerical value is not limited here, 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 can be 2 units of second infrared light, and the third value can be 0.005 microamp; when the first value is 4 cm, the second value can be 1 The unit of the second infrared light, the third value may be 0.004 microamps. The third value may be directly generated at the beginning of use of the mobile terminal, or may be adjusted according to the actual use situation during the use process. It should be noted that, the closer the mobile terminal is to the obstacle, the larger the value of the pulse signal output by the infrared receiving tube 3 is.

In addition, it should be noted that, in order to better distinguish the pulse signal and the DC signal, the DC signal can be filtered out by the noise filter circuit, only the pulse signal can be obtained, and the mobile terminal and the human body can be detected according to the value of the pulse signal. the distance between.

Wherein, the display screen 1 may include a first area, and the first area is a light transmission area of infrared light from the infrared emission tube 2 of the mobile terminal to the infrared receiving tube 3; the controller can control the first area in the first display state and the second The display states are switched, so that the first infrared light emitted outward through the first region forms a pulsed infrared light. Referring to FIG. 1 and FIG. 6 , the infrared emitting tube 2 and the infrared receiving tube 3 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 on the display screen except the first area 601 can only be in the first display state or the second display state. Specifically Yes, the first area 601 may display the first frame picture and the second frame picture in combination, and other areas on the display screen except the first area 601 may only display the first frame picture. In this embodiment, the controller can control the first area to be displayed through the combination of the first frame picture and the second frame picture, so that the first infrared light emitted through the first area forms pulse infrared light, avoiding all The display screen 1 is used to display the first frame picture and the second frame picture in combination, so as to reduce the energy consumed by all the display screens 1 for combined display of the first frame picture and the second frame picture, and the corresponding extension the service life of the display screen 1.

The mobile terminal provided by the embodiment of the present invention further includes a noise floor filtering circuit and a pulse signal processing circuit, the noise floor filtering circuit is connected with the infrared receiving tube, and the pulse signal processing circuit is connected with the infrared receiving tube. Through the above arrangement, the controller is used to control at least a part of the display screen to switch between the first display state and the second display state, so that the first infrared light emitted from the display screen to the outside of the mobile terminal forms pulsed infrared light, and the pulsed infrared light When encountering an obstacle, it can return to the infrared receiving tube, so as to realize the infrared detection function, so that the infrared detection function can be realized without separately setting 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 reflective plate that are stacked in sequence, and further includes a light source 4 connected to the light guide plate, and the infrared emission tube 2 is connected to the light guide plate.

Wherein, the light-emitting source 4 can be a white LED light bar. Of course, the white-light LEDs can also be connected in series to form the light-emitting source 4 . In addition, the light-emitting source 4, the infrared emitting tube 2 and the infrared receiving tube 3 can all be arranged on the same side of the light guide plate, and the light-emitting source 4 can be arranged between the infrared emitting tube 2 and the infrared receiving tube 3. The display screen 1 of the mobile terminal is independently provided with infrared emission holes, so that the display area of the display screen 1 can be enlarged. Of course, the infrared emission tube 2 and the infrared reception tube 3 can also be arranged on different sides of the light guide plate. The specific settings are not limited here.

Wherein, the width of the light source 4 may be the same as the width of the area used for display on the display screen 1 of the mobile terminal.

In the embodiment of the present invention, the display screen includes a liquid crystal layer, a light guide plate and a reflective plate that are stacked in sequence, and also includes a light-emitting source connected to the light guide plate. The infrared light emitted by the infrared emission tube can be conducted along the light guide plate, and the infrared light The display screen can be reflected through the reflective plate, so that by arranging the liquid crystal layer, the light guide plate and the reflective plate, the transmission effect of infrared light can be better.

Optionally, the mobile terminal further includes Application Specific Integrated Circuits (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 to detect whether the value of the pulse signal output by the infrared receiving tube 3 is greater than a preset value when the light-emitting source 4 is in a light-emitting state; if it is detected that the value of the pulse signal is greater than the preset value value, the ASIC controls the light-emitting source 4 to turn off.

The value of the preset value may be 0.01 μA, 0.05 μA, or 0.10 μA, etc., and the specific value is not limited herein. The value of the preset value may be obtained automatically at the beginning of use of the mobile terminal, or may be adjusted according to the user's adjustment operation. In addition, when an analog-to-digital converter is included in the pulse signal processing circuit, the ASIC may be connected to the analog-to-digital converter. It should be noted that the ASIC may be an independent device in the mobile terminal.

In the embodiment of the present invention, when the ASIC detects that the value of the pulse signal output by the infrared receiving tube is greater than the preset value, it indicates that the distance between the mobile terminal and the obstacle is relatively close, and the ASIC controls the light-emitting source to be turned off, even if the mobile terminal is in the off-screen state, thus The power consumption of the mobile terminal is reduced, and the occurrence of the phenomenon that the user triggers the display screen by mistake can also be reduced, thereby making the mobile terminal more intelligent.

Optionally, the noise floor filtering circuit includes a DC absorber 6 connected to the infrared receiving tube 3 at one end and grounded at the other end.

Wherein, the DC absorber 6 can use a current sink, and the above-mentioned DC absorber 6 can pass a DC signal. One end of the above-mentioned DC absorber 6 is connected to the output end of the infrared receiving tube 3 , and the other end of the DC absorber 6 is grounded, so that the DC signal output by the infrared receiving tube 3 can be absorbed.

In the embodiment of the present invention, the noise floor filtering circuit includes a DC absorber, which can absorb the DC signal output by the infrared receiving tube, and can reduce the influence of the DC signal on the judgment result when judging whether the value of the pulse signal reaches a preset value .

Optionally, the pulse signal processing circuit includes a capacitor 5 and an analog-to-digital converter. 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 specifications of the capacitor 5 can be designed according to the actual needs of the mobile terminal, and the specifications of the capacitor 5 are not specifically limited. For example, the capacitor 5 can be a 10 microfarad capacitor. In addition, the analog-to-digital converter can convert the pulse signal into a digital signal, which is convenient for transmission inside the mobile terminal.

In the embodiment of the present invention, the signal output by the infrared receiving tube includes two parts, one part is an alternating current signal, and the other part is a direct current signal. The noise floor filtering circuit includes capacitors. Because of the capacitor's function of "passing AC and blocking DC", the output pulse signal of the infrared receiving tube can be selected, so that when judging whether the value of the pulse signal reaches the preset value, it can be Reduce DC signal interference.

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.

Among them, the pulsed infrared light received by the infrared receiving tube 3 at a certain moment is smaller, resulting in a smaller converted pulse signal. For example, the pulsed infrared light received at the first moment is smaller, resulting in a smaller converted pulse signal. Therefore, the pulse signal at the first moment can be amplified by the amplifier 7, and then converted by the analog-to-digital converter, so as to facilitate the transmission.

In the embodiment of the present invention, the noise floor filtering circuit further includes an amplifier, which can be amplified when the pulse signal output by the infrared receiving tube is small, thereby making the transmission of the pulse signal 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.

Among them, to increase the converted current signal, the pulse signal for a period of time can also be accumulated by the integrator, and then converted by the analog-to-digital converter, so as to facilitate the transmission. It should be noted that the period of time is not limited here, for example, it may be 1 millisecond or 3 milliseconds.

In the embodiment of the present invention, the above-mentioned mobile terminal may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a personal digital assistant (Personal Digital Assistant, PDA for short), a mobile Internet Device (Mobile Internet Device, MID) or Wearable Device (Wearable Device) and so on.

In the embodiment of the present invention, the noise floor filtering circuit further includes an integrator. When the pulse signal output by the infrared receiving tube is small, the pulse signal received within a period of time can be accumulated, thereby making the transmission of the pulse signal more convenient.

Optionally, the ASIC is also used for: when the light-emitting source 4 is in an off state, if the ASIC detects that the value of the pulse signal output by the infrared receiving tube 3 is less than or equal to the preset value , the ASIC controls the light-emitting source 4 to emit light.

In the embodiment of the present invention, when the light-emitting source is in an off state, if the ASIC detects that the value of the pulse signal output by the infrared receiving tube is less than or equal to the preset value, it can determine that the mobile terminal is far away from the obstacle at this time, thus The light-emitting source can be controlled to emit light, so that the display screen of the mobile terminal is in a bright screen state, so that the automatic adjustment of the light-emitting of the light-emitting source can be realized, thereby making the mobile terminal more intelligent.

Referring to FIG. 3, FIG. 3 is a flowchart of an infrared detection method provided by an embodiment of the present invention. The above method is applied to a mobile terminal. The mobile terminal includes a display screen, an infrared emitting tube and an infrared receiving tube. The infrared emitting tube is arranged at one end of the display screen, and the infrared receiving tube is arranged at another end of the display screen. One end; as shown in Figure 3, the method includes the following steps:

Step 301: Detect the infrared emission signal emitted by the infrared emission tube.

The detection of the infrared emission signal emitted by the infrared emission tube may detect data such as the number of infrared emission signals and/or the emission time, which is not specifically limited herein.

Wherein, the display screen, the infrared emitting tube and the infrared receiving tube can be each part of a whole infrared detection module, of course, can also be each independent part.

Step 302: Detect the infrared receiving signal received by the infrared receiving tube through the display screen.

Wherein, when the infrared receiving signal is detected, the receiving time and/or the number of receiving the infrared receiving signal, etc. may be detected.

Among them, the infrared light received by the infrared receiving tube includes two parts, one is the second infrared light, and the other is the DC infrared light, wherein the DC infrared light is emitted by the infrared transmitting tube, and is transmitted to 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 the first infrared light, and the infrared light returned to the infrared receiving tube after the first infrared light encounters an obstacle is the first infrared light. Two 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 returned to the infrared receiving tube after encountering the obstacle, so as to realize the function of infrared detection. It should be noted that the above-mentioned DC infrared light emitted by the infrared transmitting tube and conducted to the infrared receiving tube through the display screen will cause certain errors in the infrared detection results of the mobile terminal, but the error is small.

Step 303: Determine whether the foreign object is in an approaching or distant state according to the infrared emission signal and the infrared reception signal.

Wherein, in the above steps, the transmitting moment of the infrared transmitting signal and the receiving moment of the infrared receiving signal can be detected, and the time interval between the transmitting moment and the receiving moment can be calculated, and the size of the time interval is used to determine whether the foreign object is close to the mobile terminal or far away mobile terminal status, so as to realize the infrared ranging function. For example, if the time interval is less than 1 millisecond, it is judged that the foreign object is closer to the mobile terminal, and if the time interval is greater than 1 millisecond, it is judged that the foreign object is farther from the mobile terminal. Of course, the infrared ranging function can also be realized according to the number of infrared transmitting signals and infrared receiving signals. For example, if the difference between the number of infrared transmitting signals and infrared receiving signals is large, it means that the foreign object is far away from the mobile terminal; If the difference between the number of the received infrared signal and the infrared signal is small, it means that the foreign object is closer to the mobile terminal.

In addition, it can also be judged whether the foreign object is in a state of approaching or moving away from the mobile terminal according to the number of received infrared reception signals. For example, if the received infrared reception signal is greater than 10 units, it is determined that the foreign object is relatively close to the mobile terminal; if the received infrared reception signal is less than or equal to 10 units, it is determined that the foreign object is far away from the mobile terminal.

Optionally, step 303 may include:

When the difference between the infrared emission signal and the infrared reception signal is less than or equal to a preset value, the foreign object is in an approaching state;

When the difference between the infrared emission signal and the infrared reception signal is greater than a preset value, the foreign object is in a far away state.

It should be noted that the specific value of the preset value is not limited here, for example, the preset value may be 3 units or 5 units.

In this embodiment, by comparing the difference between the infrared emission signal and the infrared reception signal, it is judged that the foreign object is in a state of approaching or moving away, so that the judgment result of the mobile terminal is more intuitive and accurate.

In the embodiment of the present invention, through steps 301, 302 and 303, it is determined according to the infrared emission signal and the infrared reception signal that the foreign object is in an approaching or distant state, so that infrared emission holes can be realized without separately setting an infrared emission hole on the display screen of the mobile terminal. detection function, and also improve the utilization of the display.

Referring to FIG. 4 , FIG. 4 is a flowchart of another infrared detection method provided by an embodiment of the present invention. The main difference between this embodiment and the previous embodiment is that in this embodiment, the controller can control part of the display screen to switch between the first display state and the second display state, so that the first infrared light forms pulsed infrared light, and then according to the The received pulse infrared light realizes the infrared detection function. The above method is applied to a mobile terminal. The mobile terminal includes a display screen, an infrared emitting tube and an infrared receiving tube. The infrared emitting tube is arranged at one end of the display screen, and the infrared receiving tube is arranged at another end of the display screen. One end; as shown in Figure 4, the method includes the following steps:

Step 401: Control at least a part of the display screen to switch between a first display state and a second display state through the controller, so that the first infrared light forms pulsed infrared light; wherein, the display screen is in the first display state. In the 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 the second display state, the infrared light cannot be transmitted to the mobile terminal through the display screen outside;

Wherein, at least a part of the display screen is controlled by the controller to switch between the first display state and the second display state, so that the first infrared light forms pulsed infrared light, and the pulsed infrared light can be returned to the mobile terminal if it encounters an obstacle. The display screen returns to the infrared receiving tube, and the pulsed infrared light returned to the infrared receiving tube at this time is the second infrared light. By detecting the size of the second infrared light, the infrared detection function can be realized. Similarly, it is also possible to detect the emission moment of the pulsed infrared light and the reception moment of the second infrared light, and calculate the time interval between the emission moment and the reception moment, and determine whether the foreign object is close to the mobile terminal or moving away from the mobile terminal according to the size of the time interval. terminal status, so as to realize the infrared ranging function. in addition. It can also be determined that the foreign object is in a state of approaching the mobile terminal or away from the mobile terminal by detecting the magnitude of the difference in quantity between the emitted pulsed infrared light and the received second infrared light.

The working principle of this embodiment may be as follows: a part of the display screen may be controlled by the controller to switch between the first display state and the second display state, for example, a part of the display screen may be controlled by the controller to alternately display the first frame and the second frame frame picture, and the first frame picture can be a black frame picture, the second frame picture can be a white frame picture, when the first frame picture is a black frame picture, and the second frame picture is a white frame picture, control the mobile terminal through the controller Part of the display screen alternately displays white frame pictures and black frame pictures, and at this time, the infrared light emitted by the infrared emission tube can be transmitted through the display screen when the display screen displays a white frame picture, but cannot be transmitted when the display screen displays a black frame picture. screen, the first infrared light transmitted out of the display screen forms pulsed infrared light. The above-mentioned pulsed infrared light transmitted out of the display screen will return to the display screen when encountering obstacles, and then a part of the second infrared light received by the infrared receiving tube is the second infrared light, so the second infrared light is also pulsed infrared light, and the second infrared light In the infrared receiving tube, it can be converted into a pulse signal, and the noise floor filtering circuit can directly filter the DC signal output by the infrared receiving tube, thereby reducing the interference of the DC signal when processing the pulse signal. The pulse signal processing circuit processes the pulse signal, For example: when the pulse signal at the first moment is too small, the pulse signal processing circuit integrates or amplifies the pulse signal within a period of time including the first moment, so as to make it more convenient to judge the size of the pulse signal, and more convenient In the transmission of the pulse signal inside the mobile terminal, by detecting the size of the pulse signal processed by the pulse signal processing circuit at this time, the distance between the mobile terminal and the obstacle can be detected, thereby completing the infrared detection function.

Among them, the infrared light received by the infrared receiving tube includes two parts, one part is the pulsed infrared light (ie, the second infrared light) that is returned to the infrared receiving tube through the display screen when encountering obstacles, and this part of the pulsed infrared light can be converted into The other part of the pulse signal is sent from the infrared emitting tube, and the DC infrared light is transmitted to the infrared receiving tube through the display screen, and this part of the DC infrared light can be converted into a DC signal.

In addition, please refer 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: a DC signal and a pulse signal, while the infrared The current signal output by the receiving tube 3 is obtained by converting the infrared light received by the infrared receiving tube 3. The infrared light received by the infrared receiving tube 3 can be divided into two types: A and B. The type B infrared light is emitted by the infrared transmitting tube 2. , and transmits the pulsed infrared light formed by the display screen 1; A kind of infrared light is emitted by the infrared emission tube 2, and directly passes through the display screen 1 and enters the direct current infrared light of the infrared receiving tube 3. After the B infrared light is transmitted out of the display screen, when it encounters an obstacle C (C is generally a human body), it will change the transmission route and return to the infrared receiving tube 3, then the infrared receiving tube 3 receives the B infrared light, and according to the The above-mentioned B infrared light is converted to obtain a pulse signal, while the A infrared light is received by the infrared receiving tube 3 and converted to obtain a DC signal.

Optionally, the display screen includes a first area, and the first area is a light transmission area of infrared light from an infrared emission tube of the mobile terminal to an infrared receiving tube, and the controller controls at least a part of all The step of switching the display screen between the first display state and the second display state, so that the first infrared light forms pulsed infrared light, may include:

The controller controls the first area to switch 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 a pulsed infrared light Light.

The first area is the light transmission area of infrared light from the infrared emitting tube of the mobile terminal to the infrared receiving tube, please refer to FIG. 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 on the display screen except the first area 601 can only be in the first display state or the second display state.

In this embodiment, the controller controls the first area to switch between the first display state and the second display state, and controls other areas on the display screen except the first area to be in the first display state or the second display state only. When the other areas are in the second display state, that is, the other areas are in the off-screen state, in this way, the power consumption of the mobile terminal can be reduced, so that the mobile terminal is more intelligent and more convenient to use.

Step 402 , controlling the noise floor filtering circuit to filter out the DC signal output by the infrared receiving tube.

Among them, the noise floor filtering circuit can directly filter the DC signal output by the infrared receiving tube, thereby reducing the interference of the DC signal when processing the pulse signal.

Step 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.

Among them, the pulse signal processing circuit can amplify, integrate or digitally convert the pulse signal output by the infrared receiving tube. In this way, by amplifying or integrating the pulse signal, it is more convenient to judge the size of the pulse signal. Converting the pulse signal into a digital signal can make the internal transmission of the pulse signal in the mobile terminal more convenient.

Step 404: Determine whether the foreign object is in an approaching or away state according to the pulse signal.

Among them, the number of pulse signals can be detected to determine whether the foreign object is in the state of approaching or moving away, so as to realize the infrared ranging function. For example, if the number of detected pulse signals is greater than 10 units, it is determined that the foreign object is relatively close to the mobile terminal; if the number of detected pulse signals is less than or equal to 10 units, it is determined that the foreign object is farther from the mobile terminal. Of course, the standard of judgment is not limited here.

Optionally, the display screen includes a liquid crystal layer, a light guide plate and a reflective plate that are stacked in sequence, and also includes a light-emitting source connected to the light guide plate, and the infrared emission tube is connected to the light guide plate; after step 404, The above method may also include the following steps:

When the light-emitting source is in a light-emitting state, detecting whether the value of the pulse signal output by the infrared receiving tube is greater than a preset value;

If it is detected that the value of the pulse signal is greater than the preset value, the light-emitting source is turned off.

The specific value of the preset value is not limited here, and the preset value may be set before the mobile terminal leaves the factory, or may be automatically obtained from the server when the mobile terminal is activated.

In this embodiment, when it is detected that the value of the pulse signal output by the infrared receiving tube is greater than the preset value, indicating that the distance between the mobile terminal and the obstacle is relatively close, the light-emitting source is turned off, so that the mobile terminal is in the off-screen state, thereby reducing the It reduces the power consumption of the mobile terminal and makes the mobile terminal more intelligent.

Optionally, after the step of turning off the light-emitting source if it is detected that the value of the pulse signal is greater than the preset value, the method further includes:

If it is detected that the value of the pulse signal output by the infrared receiving tube is less than or equal to the preset value, the light-emitting source is turned on.

Among them, after the light-emitting source is extinguished. The mobile terminal can also detect in real time whether the value of the pulse signal output by the infrared receiving tube is greater than a preset value, and if it is detected that the value of the pulse signal output by the infrared receiving tube is less than or equal to the preset value, turn on the transmitter. The light source makes the light source 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 the preset value at regular intervals, and the period of time is fixed, for example, it can be 1 millisecond or 2 milliseconds. Or 3ms etc. There is no specific limitation here.

In this embodiment, when the light-emitting source is turned off, and it is detected that the value of the pulse signal output by the infrared receiving tube is less than or equal to the preset value, it can be judged that the distance between the obstacle and the mobile terminal is far, and the light-emitting source is turned on. The light-emitting source is made to emit light, so that when the detected obstacle is far from the mobile terminal, the light-emitting source is turned on, thereby making the mobile terminal more intelligent and making the mobile terminal more convenient to use.

In the embodiment of the present invention, the processor controls at least a part of the display screen to switch between the first display state and the second display state, so that the first infrared light forms pulsed infrared light, so that the infrared detection function can be realized, and the noise floor filtering circuit can The DC signal is filtered out, and only the pulse signal is left, so that when the mobile terminal detects the distance between the mobile terminal and the obstacle according to the size of the pulse signal, the interference of the DC signal on the judgment result can be reduced, so that the judgment result is more accurate. In this way, a solution for realizing infrared detection is provided without having to separately set an infrared emission hole on the display screen.

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 transmitter tube and infrared receiving tube, the infrared emitting tube is set at one end of the display screen, the infrared receiving tube is set at the other end of the display screen, and the first infrared light emitted by the infrared emitting tube passes through the display screen The screen is transmitted to the outside of the mobile terminal 700, and the infrared receiving tube receives the second infrared light through the display screen, and the second infrared light is the object that the first infrared light passes through the outside of the mobile terminal 700. reflected infrared light.

Optionally, the mobile terminal 700 further includes a controller, and the controller is configured to control the display screen to be in a first display state, and when the display screen is in a first display state, the first infrared light passes through the The display screen is transmitted outside the mobile terminal 700 .

Optionally, the mobile terminal 700 further includes a noise floor filtering circuit and a pulse signal processing circuit, the noise floor filtering circuit is connected to the infrared receiving tube, and is used for filtering the DC signal output by the infrared receiving tube. ;

The controller is used to control at least a part of the display screen to switch between the first display state and the second display state, so that the first infrared light forms pulsed infrared light; wherein, when the display screen is in the second display state , the infrared light cannot be transmitted outside the mobile terminal 700 through the display screen;

The pulse signal processing circuit is connected with the infrared receiving tube, and is used for processing the pulse signal output by the infrared receiving tube after receiving the second infrared light through the display screen.

Optionally, the display screen includes a liquid crystal layer, a light guide plate and a reflective plate that are stacked in sequence, and further includes a light-emitting source connected to the light guide plate, and the infrared emitting tube is connected to the light guide plate.

Optionally, the mobile terminal 700 further includes an 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; the ASIC is used for when the light-emitting source is in the In the case of the light-emitting state, detect whether the value of the pulse signal output by the infrared receiving tube is greater than a preset value; if the ASIC detects that the value of the pulse signal is greater than the preset value, the ASIC controls the The light source is off.

Optionally, the noise floor filtering circuit includes a DC absorber connected to the infrared receiving tube at one end and grounded at the other end.

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: when the light-emitting source is in an off state, if the ASIC detects that the value of the pulse signal output by the infrared receiving tube is less than or equal to the preset value, The ASIC controls the light-emitting source to emit light.

Wherein, the input unit 730 can be used to receive numeric or character information input by the user, and generate signal input related to user settings and function control of the mobile terminal 700 . Specifically, in this 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 the user's touch operations on or near it (such as the user's operations on the touch panel 731 using any suitable objects or accessories such as a finger, a stylus, etc.) The specified program drives the corresponding connection device. Optionally, the touch panel 731 may include two parts, a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and then sends it to the touch controller. To the processor 750, and can receive the commands sent by the processor 750 and execute them. In addition, the touch panel 731 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic waves. In addition to the touch panel 731, the input unit 730 may also include other input devices 732, and the other input devices 732 may include but are not limited to physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, joysticks, etc. one or more of.

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 (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. When the touch display screen detects a touch operation on or near it, it is transmitted to the processor 750 to determine the type of touch event, and then the processor 750 provides corresponding visual output on the touch display screen according to the type of touch event.

The touch screen includes the application program interface display area and the commonly used controls display area. The arrangement of the application program interface display area and the common control display area is not limited, and may be an arrangement that can distinguish the two display areas, such as up-down arrangement, left-right arrangement, or the like. The application program interface display area can be used to display the interface of the application program. Each interface may contain at least one application icon and/or interface elements such as widget desktop controls. The application program interface display area can also be an empty interface that does not contain any content. The commonly used control display area is used to display controls with high usage rate, such as setting buttons, interface numbers, scroll bars, phonebook icons and other application icons.

The processor 750 is the control center of the mobile terminal 700, uses various interfaces and lines to connect various parts of the entire mobile phone, runs or executes the software programs and/or modules stored in the first memory 721, and calls the software programs and/or modules stored in the second memory 721. The data in the memory 722 executes various functions of the mobile terminal 700 and processes data, so as to monitor the mobile terminal 700 as a whole. Optionally, processor 750 may include one or more processing units.

The electronic device may include at least one of a cell phone, a tablet computer, an e-book reader, an MP3 player, an MP4 player, a digital camera, a laptop computer, a car computer, a desktop computer, a set-top box, a smart TV, and a wearable device. one.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art who is familiar with the technical scope disclosed by the present invention can easily think of changes or replacements, which should cover within the protection scope of the present invention. Therefore, the protection scope of the present invention should 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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