TWI445992B - Method and device of proximity sensing - Google Patents

Description

Proximity sensing method and device

The invention relates to a detection method and device, in particular to a proximity sensing method and device for detecting whether an object is close.

In recent years, proximity sensing devices have been widely used in electronic devices having touch panels, such as mobile phones. As shown in FIG. 1 , a conventional proximity sensing device is disposed under a touch panel 40 of a mobile phone (not shown), and mainly includes an infrared light emitting diode 41 and an infrared light emitting diode 41. A photo sensor 43 adjacent to and separated by a light blocking mechanism 42 and a processor 44. The infrared illuminating diode 41 emits an optical signal E. The optical sensor 43 receives a reflected optical signal R reflected by the optical signal E from an object 50 and transmits it to the processor 44. The processor 44 transmits the reflected optical signal. R is digitized to a light intensity value. Generally, as shown in FIG. 2, the light intensity value will gradually increase as the distance between the object 50 and the photo sensor 43 becomes shorter until it approaches a maximum value of 2000. Therefore, the processor 44 sets a threshold value, for example, 1000 according to a preset critical distance, for example, 70 mm, and determines whether the obtained light intensity value is greater than the threshold value. If yes, it determines that the object 50 is close to the mobile phone, and then turns off. The touch panel 40 prevents the object 50 from accidentally touching the touch panel 40 to cause malfunction of the electronic device.

However, as shown in FIGS. 3 and 4, when the object 60 is an object having a low reflectance, such as a black card or a user's black hair, it is found that when the object 60 is relatively close to the mobile phone, for example, with a mobile phone. When the distance is in the range of 2-3 mm, the light intensity value of the reflected light signal reflected by the object 60 will be higher than the critical value. 1000, but when the distance between the object 60 and the mobile phone is shorter than 2 mm, the intensity value of the reflected light signal reflected by the object 60 is sharply attenuated to below the threshold value 1000, causing the processor 44 to misjudge the object 60 away from the mobile phone. The touch panel 40 is turned on.

Accordingly, it is an object of the present invention to provide a proximity sensing method and apparatus that avoids misjudging an object from being approached because the reflectivity of the object is too low.

In order to achieve the above object, the first proximity sensing method of the present invention is preliminarily provided with an adjacent first light emitting component and a light sensor, and a second light emitting component spaced apart from the photo sensor by a predetermined distance. And performing the steps of: (A) causing the first light emitting element to emit a first light signal, so that the light sensor senses a first reflected light signal of the first light signal; (B) determining the first light reflection Whether the intensity of the optical signal is greater than a critical value, and if so, determining that an object is close; (C) determining whether the intensity of the first reflected optical signal continues to be greater than a threshold, and if not, causing the second illuminating element to emit a second a light signal, wherein the light sensor senses a second reflected light signal of the second light signal; and (D) determines whether a ratio of the intensity of the first reflected light signal to the intensity of the second reflected light signal is It is greater than a preset value, and if so, it is determined that an object is close.

Preferably, in step (B), when it is determined that the intensity of the first reflected light signal is less than or equal to the critical value, it is determined that no object is approaching.

Preferably, in step (D), when it is determined that the ratio is less than or equal to the preset value, it is determined that no object is approaching, and the second light-emitting element is turned off.

Preferably, in the step (D), the first light-emitting element and the second light-emitting element alternately emit the first light signal and the second light signal.

The second proximity sensing method of the present invention is provided with a first first light-emitting element and a light sensor, and a second light-emitting element spaced apart from the light sensor by a predetermined distance, and the steps include: (A) causing the first illuminating element to emit a first optical signal, such that the photo sensor senses a first reflected optical signal of the first optical signal; (B) determining whether the intensity of the first reflected optical signal is More than a threshold value, if yes, determining that an object is close, and causing the second light emitting element to emit a second light signal, so that the light sensor senses a second reflected light signal of the second light signal; and (C And determining whether a ratio of the intensity of the first reflected light signal to the intensity of the second reflected light signal is greater than a predetermined value, and if so, determining that an object is close, otherwise determining that no object is close.

The third proximity sensing method of the present invention is provided with a first first light-emitting element and a light sensor, and a second light-emitting element spaced apart from the light sensor by a predetermined distance, and the steps include: (A) causing the first light-emitting element and the second light-emitting element to alternately emit a first light signal and a second light signal, so that the light sensor respectively senses a first reflected light of the first light signal a signal, and a second reflected light signal for sensing the second optical signal; and (B) determining whether a ratio of the intensity of the first reflected light signal to the intensity of the second reflected light signal is greater than a predetermined value, If yes, it is determined that there is an object approaching, otherwise it is determined that no object is close.

The first proximity sensing device of the first method of the present invention comprises a first illuminating component, a photosensor adjacent to the first illuminating component, and a predetermined interval from the photosensor. a second illuminating component of the distance, a controller and a processor; the controller controls the first illuminating component to emit a first optical signal, so that the photo sensor senses one of the first optical signals When the first reflected light signal is detected, and the processor determines that the intensity of the first reflected light signal is greater than a threshold value, determining that an object is close, and subsequently determining that the intensity of the first reflected light signal is less than or equal to the critical value, Having the controller control the second illuminating element to emit a second optical signal, so that the photo sensor senses a second reflected optical signal of the second optical signal, and the processor determines the first reflected optical signal When a ratio of the intensity to the intensity of the second reflected light signal is greater than a predetermined value, it is determined that an object is close.

Preferably, when the processor first determines that the intensity of the first reflected light signal is less than or equal to the critical value, it is determined that no object is approaching.

Preferably, the processor determines that the ratio is less than or equal to the preset value, determines that no object is close, and causes the controller to turn off the second illuminating element.

Preferably, when the second light emitting component emits the second light signal, the controller controls the first light emitting component and the second light emitting component to alternately emit the first optical signal and the second optical signal.

Preferably, the second illuminating component is disposed on a side of the first illuminating component away from the photo sensor, and the proximity sensing device further includes a first illuminating component and the photo sensor. a first light blocking mechanism and a second light blocking mechanism disposed on a side of the second light emitting element adjacent to the second light emitting element.

The second proximity sensing device of the second method of the present invention comprises a first light emitting element, a light sensor adjacent to the first light emitting element, and a predetermined distance from the light sensor. a second illuminating component, a controller and a processor; the controller controls the first illuminating component to emit a first optical signal, so that the optical sensor senses a first inverse of the first optical signal And detecting, by the processor, that the intensity of the first reflected light signal is greater than a threshold, determining that an object is close, and causing the controller to control the second light emitting component to emit a second light signal, so that the light is sensed Sensing a second reflected light signal of the second optical signal, and the processor determines that a ratio of the intensity of the first reflected light signal to the intensity of the second reflected light signal is greater than a predetermined value, Some objects are close.

The third proximity sensing device of the third method of the present invention comprises a first illuminating component, a photosensor adjacent to the first illuminating component, and a predetermined distance from the photosensor a second illuminating component, a controller and a processor; the controller controls the first illuminating component and the second illuminating component to alternately emit a first optical signal and a second optical signal, so that the optical sensor Sensing a first reflected light signal of the first optical signal and a second reflected light signal of the second optical signal, and the processor determines the intensity of the first reflected light signal and the second reflection When a ratio of the intensity of the optical signal is greater than a predetermined value, it is determined that an object is close, otherwise it is determined that no object is close.

The proximity sensing device of the present invention is provided by disposing two light-emitting elements that are one far away with one light sensor or two light sensors that are close to one farther with one light-emitting element, and only open the closer one In the case of a light-emitting element or a light sensor, when the intensity of the reflected light reflected by the object is changed from greater than a critical value to less than a critical value, the light-emitting element or the light sensor can be turned on again to obtain a case in this case. a ratio of the intensity of a near-far reflected light reflected by the object that is inversely proportional to the distance between the object and the proximity sensing device, and further determining the object by determining whether the ratio is greater than a predetermined value The body is relatively close to or far from the sensing device, avoiding the occurrence of misjudgment due to low reflectivity of the object, and achieves the efficacy and purpose of the present invention.

The foregoing and other objects, features, and advantages of the invention are set forth in the <RTIgt;

Referring to FIG. 5, the proximity sensing device of the present invention can be applied to an electronic device (not shown) provided with a touch screen 20, such as a mobile phone. The first preferred embodiment includes a printed circuit board. A first light-emitting element 11 on the bottom of the touch screen 20, a light sensor 13 adjacent to the first light-emitting element 11 and separated by a light-shielding mechanism 12, and a photo sensor 13 are spaced apart from each other. A second light-emitting element 14 having a predetermined distance D, a controller 15 electrically coupled to the first light-emitting element 11 and the second light-emitting element 14, and a processor 16 electrically coupled to the controller 15 and the touch screen 30. The predetermined distance D is at least twice (above) the distance between the first light-emitting element 11 and the photo sensor 13.

The first light-emitting element 11 and the second light-emitting element 14 are infrared light-emitting diodes that emit infrared light, and the light sensor 13 is an infrared light sensor, and the light-shielding mechanism 12 is used to avoid the first light-emitting element 11 The emitted light is directly received by the photo sensor 13 without being reflected by the object. The second light-emitting element 14 is disposed on the opposite side of the first light-emitting element 11 from the photo sensor 13, and the other side of the second light-emitting element 14 adjacent to the first light-emitting element 11 is further provided with another light-blocking mechanism. 17. The light emitted by the second illuminating element 14 is prevented from being directly received by the photo sensor 13 without being reflected by the object.

And the first embodiment of the proximity sensing device implements the proximity sensing side of the present invention The first preferred embodiment of the method is as shown in step S61 of FIG. 6. First, the controller 15 controls the first light-emitting element 11 to emit a first optical signal E1. As shown in FIG. 5, the light sensor 13 is sensed. The first reflected optical signal R1 reflected from the first optical signal E1 is detected and transmitted to the processor 16, and then, in step S62, the processor 16 converts the first reflected optical signal R1 into an analog/digital number. A light intensity value V1. And if the object 30 is a low reflectivity object, the light intensity value of the first reflected light signal R1 reflected by the first light signal E1 from the object 30 and the object 30 and the proximity sensing device can be obtained as shown in FIG. 7 . One of the correspondences between the distances is the first light intensity value curve S1. It is also assumed that the processor 16 presets a first threshold, for example 1000, to determine whether to close or turn on the touch screen 20 by determining whether the first light intensity value V1 is greater than the first threshold.

Therefore, in step S62, the processor 16 determines whether the first light intensity value V1 is greater than the first threshold (1000), and if so, if the processor 16 determines that the object 30 is approaching in step S63, the corresponding signal is generated to close the touch. Controlling the screen 20, and proceeding to step S64, continuing to determine whether the first light intensity value V1 generated by the light sensor 13 corresponding to the first reflected light signal R1 is greater than a predetermined second threshold value, the second threshold value It may be equal to or smaller than the first critical value, for example 600, and if so, repeat steps S63 and S64 until the first light intensity value V1 is found to be less than or equal to the second critical value. As can be seen from FIG. 7, since the object 30 has a low reflectivity characteristic, when the object 30 is very close to the photo sensor 13 as shown in FIG. 8, or as far away from the photo sensor 13 as shown in FIG. This will cause the first light intensity value V1 to drop.

As shown in FIG. 5 and FIG. 7, when the first light-emitting element 11 and the second are controlled The light-emitting elements 14 alternately (in turn) emit the first light signal E1 and the second light signal E2, and the light intensity of the second reflected light signal R2 reflected from the object 30 by the second light signal E2 emitted by the second light-emitting element 14 can be obtained. a value corresponding to the distance between the object 30 and the proximity sensing device, a second light intensity value curve S2, and the processor 16 divides the value of the first light intensity value curve S1 by the second light intensity value curve S2 The value can be obtained as a ratio curve S3 shown in FIG. 7, and the change of the ratio curve S3 is inversely proportional to the distance between the object 30 and the proximity sensing device, especially when the object 30 is closer to the proximity sensing device, the higher the ratio Therefore, the processor 16 can further determine whether the object 30 is closer or farther by the ratio. Therefore, the processor 16 sets a third threshold corresponding to the second threshold (600) in FIG. 7, for example, 1.74.

Thereby, in step S64, when the processor 16 finds that the first light intensity value V1 is changed from greater than the second threshold value to less than (or equal to) the second threshold value, in order to determine whether the object 30 is closer or farther away, such as In step S65, the processor 16 causes the controller 15 to control the second light-emitting element 14 to emit the second light signal E2, and the second light signal E2 and the first light signal E1 are respectively separated by the first light-emitting element 11 and the second light-emitting element 14, For example, the interlaced (rotation) transmission, the photo sensor 15 receives and senses the first reflected light signal R1 and the second optical signal E2 reflected by the object 30 from the object 30 to be reflected back from the object 30. The two reflected optical signals R2 transmit the first reflected optical signal R1 and the second reflected optical signal R2 to the processor 16, respectively. Then, in step S66, the processor 16 performs analog/digital conversion of the first reflected light signal R1 and the second reflected light signal R2 into a first light intensity value V1 and a second light intensity value V2, and obtains a first light intensity. a ratio of the value V1 to the second light intensity value V2, ie V1/V2, and determining whether the ratio is greater than the second threshold (1.74). If yes, indicating that the object 30 is closer, returning to step S63, the touch screen 20 is continuously turned off; if not, indicating that the object 30 is indeed facing away If the direction is moved, step S67 is executed to turn off the second light-emitting element 14 to save power consumption. If the object 30 is determined to be away from the light sensor 13 in step S68, an open signal is generated to cause the touch screen 20 to be turned on, and the steps are repeated. S62.

It is noted that, in step S65, the first light-emitting element 11 and the second light-emitting element 14 can simultaneously transmit the first light signal and the second light signal at different frequencies, respectively, and the processor 16 receives the first When the reflected light signal R1 and the second reflected light signal R2 are reflected, it can be distinguished from the difference between the two frequencies that the two are respectively reflected by the first optical signal and the second optical signal.

In step S62, when the processor 16 determines that the first light intensity value V1 is less than or equal to the first threshold, step S68 is performed to determine that the object 20 is not in proximity to the light sensor 13, and the touch screen 20 is continuously turned on. And repeating step S62, continuously determining the first reflected light signal R1 sensed by the light sensor 13.

Therefore, when the object 30 with low reflectivity is effectively disposed, the object is not misjudged because the intensity of the reflected light reflected by the object 30 is decreased, and the touch screen 20 of the electronic device is turned on, causing the touch screen 20 to be accidentally touched. The situation happened. Of course, the proximity sensing device of the embodiment is not limited to the application of the touch screen, and may also control other components in the electronic device that need to be linked or moved away from or close to the object according to the object approaching or moving away from the trigger signal. Features.

Referring again to FIG. 9, the proximity sensing device of the present embodiment implements the present invention. A second preferred embodiment of the proximity sensing method is the same as the first embodiment in that steps S91 to S93 are the same as steps S61 to S63 of FIG. 6, and steps S94 to S97 are the same as steps S65 to S68 of FIG. The difference from the first embodiment is that step S64 in FIG. 6 is omitted, that is, in step S93, when the processor 16 determines that the object 30 is close to the photo sensor 13, step S94 is executed (corresponding to the step of FIG. 6). S65), the controller 15 controls the first illuminating element 11 and the second illuminating unit 14 to respectively transmit, for example, the first optical signal E1 and the second optical signal E2, and proceeds to step S95, and the processor 16 determines the first optical signal. Whether the ratio V1/V2 of the first light intensity value V1 corresponding to the second light intensity value V2 generated by E1 is greater than the third threshold value (1.74), and if yes, returning to step S93, It is determined that the object 30 is close, and the touch screen 20 is continuously turned off. If not, step S96 is executed to turn off the second light-emitting element 14, and in step S97, it is determined that the object 30 is not in proximity, and an open signal is generated to cause the touch screen 20 to be Open.

Referring to FIG. 10, it is a third preferred embodiment of the proximity sensor of the present embodiment to implement the proximity sensing method of the present invention. Since the processor 16 knows that the first light signal E1 emitted by the first light emitting element 11 is from an object. The first reflected light signal R1 reflected from the light sensor 13 and the second reflected light signal E2 emitted by the second light-emitting element 14 are reflected by the object 30, and the ratio between the two is digitized. The curve S3 is inversely proportional to the distance between the object 30 and the photo sensor 13. Therefore, the processor 16 of the embodiment can also directly determine whether the object 30 is close according to the third critical value (1.74), that is, as shown in the figure. Step S101, the controller 15 controls the first light-emitting element 11 and the second light-emitting element 14 to alternately emit the first optical signal E1 and the second optical signal. No. E2, the photo sensor 13 senses the first reflected light signal R1 reflected by the object 30 by the first optical signal E1, and the second reflected light signal R2 reflected by the object 30 by the second optical signal E2. And transmitting to the processor 16, respectively, and then performing the step S102, the processor 16 digitizes the first reflected light signal R1 and the second reflected light signal R2 into a first light intensity value V1 and a second light intensity value V2, respectively. After the ratio V1/V2, it is determined whether the ratio is greater than the third threshold (1.74). If yes, then in step S103, the object 30 is determined to be close, and the touch screen 20 is turned off. Otherwise, in step S104, the object is determined. When the 30 is not in proximity, the touch screen 20 is turned on (that is, the touch screen 20 is kept on).

It is worth mentioning that the "first threshold value" in step S92 of FIG. 9 corresponds to the "threshold value" in items 6 and 14 of the patent application scope of the present invention, and the "third value" in step S95 of FIG. The "threshold value" corresponds to the "preset value" in items 6 and 14 of the scope of the present invention; and the "third threshold value" in the step S102 of FIG. 10 corresponds to the seventh and fifteenth claims of the present invention. The "preset value" in the item.

Referring to FIG. 11, which is a second preferred embodiment of the proximity sensing device of the present invention, the difference from the first embodiment is that the first embodiment is a light sensor 13 with two light-emitting elements 11 and 14 In the second embodiment, one light-emitting element 21 is combined with two photo sensors 22, 23 (hereinafter referred to as a first photo sensor 22 and a second photo sensor 23), and the remaining components are the same. The light emitting element 21 is adjacent to the first photo sensor 22 and is blocked by a light blocking mechanism 24, and the second photo sensor 23 is disposed on the opposite side of the first photo sensor 22 opposite to the light emitting element 21 and The first photo sensor 22 is blocked by a light blocking mechanism 25.

As shown in FIG. 12, the fourth preferred embodiment of the proximity sensing device of the second embodiment of the present invention is different from that of FIG. 6 in that step S121 (corresponding to step S61 of FIG. 6) is turned on. The first photo sensor 22 receives the first reflected light signal R1 ′ reflected by the object 30 from the optical signal E emitted by the light-emitting element 21 and transmits the first reflected light signal R1 ′ to the processor 16 . The processor 16 determines whether the object 30 is close to the touch screen 20 of the electronic device according to the first light intensity value V1' digitized by the first reflected light signal E1' in steps S122 and S124, and corresponds to FIG. 6 In step S65), the processor 16 causes the controller 15 to turn on the second photo sensor 23 to transmit the second reflected light signal R1' reflected by the object 30 from the optical signal E emitted by the light-emitting element 21 and transmit it to the processor. 16. In step S126 (corresponding to step 66 of FIG. 6), the processor 16 is the first reflected light signal R1' and the second transmitted from the first photo sensor 22 and the second photo sensor 23, respectively. The reflected light signal R2' is digitized into a first light intensity value V1' and a second light intensity value V2' and two are obtained The ratio of the ratio V1'/V2' is the same as that of step 66 of Fig. 6 described above. In addition, in step S126, when the processor 16 determines that the ratio V1'/V2' is smaller than the third threshold, for example, 1.74, step S127 (corresponding to step 67 of FIG. 6) is performed to turn off the second photo sensor 23. In order to save power consumption, and as in step S128, it is determined that the object 30 is not in proximity.

Referring to FIG. 13 again, the second embodiment of the proximity sensing device of the second embodiment of the present invention is different from the embodiment of FIG. 12 in that the step S124 of FIG. 12 is omitted, and the rest are the same, so Let me repeat.

Referring also to FIG. 14, a second embodiment of the proximity sensing device is implemented A sixth preferred embodiment of the inventive proximity sensing method is similar to FIG. 10 except that in step S141 (corresponding to step S101 of FIG. 10), the controller 15 controls the first photo sensor 22 and the second light. The sensor 23 is simultaneously turned on to sense the first reflected light signal R1' and the second reflected light signal R2' reflected by the object 30 from the optical signal E generated by the light-emitting element 21, and transmitted to the processor 16, and in steps In S144 (corresponding to step 104 in FIG. 10), the controller 15 turns off the second photo sensor 23, and the remaining steps S142 and S143 are the same as steps S102 and S103 in FIG. 10, and thus will not be described again.

It is to be noted that the "first threshold value" in the step S132 of FIG. 13 corresponds to the "threshold value" in the items 17 and 20 of the scope of the present invention, and the third portion in the step S135 of FIG. The "threshold value" corresponds to the "preset value" in the items 17 and 20 of the scope of the present invention; and the "third threshold value" in the step S142 of Fig. 14 corresponds to the eighth and the 21st of the patent application scope of the present invention. The "preset value" in the item.

In summary, the proximity sensing device of the present embodiment is provided by combining two light-emitting elements that are one far away with one light sensor or two light sensors that are nearly one far away, and one light-emitting element. When only the light-emitting element or the light sensor is turned on, when the intensity of the reflected light reflected by the object is changed from greater than a critical value to less than a critical value, the light-emitting element or the light sensor can be turned on again. And determining, in this case, a ratio of the intensity of a near-far reflected light reflected by the object that is inversely proportional to the distance between the object and the proximity sensing device, and determining whether the ratio is greater than a preset The value can further determine that the object is close to or away from the proximity sensing device, avoiding the occurrence of misjudgment due to the low reflectivity of the object, and indeed achieves the efficacy and purpose of the present invention.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

10‧‧‧Printed circuit board

11‧‧‧First light-emitting element

12, 17‧‧‧Light-shielding mechanism

13‧‧‧Light sensor

14‧‧‧Second light-emitting element

15‧‧‧ Controller

16‧‧‧ Processor

20‧‧‧ touch screen

21‧‧‧Lighting elements

22‧‧‧First light sensor

23‧‧‧Second light sensor

24, 25‧‧‧Light-shielding mechanism

30‧‧‧ objects

E1‧‧‧first optical signal

E2‧‧‧second optical signal

R1, R1'‧‧‧ first reflected light signal

R2, R2'‧‧‧ second reflected light signal

D‧‧‧Preset distance

S1‧‧‧first light intensity value curve

S2‧‧‧second light intensity value curve

S3‧‧‧ ratio curve

E1’‧‧‧Optical signal

S61~S68‧‧‧Steps

S91~S97‧‧‧Steps

S101~S104‧‧‧Steps

S121~S128‧‧‧Steps

S131~S137‧‧‧Steps

S141~S144‧‧‧Steps

1 shows a schematic diagram of the components of a conventional proximity sensing device; FIG. 2 shows that when a conventional proximity sensing device senses an object, the intensity of the reflected light signal reflected by the object is usually the same as the object and the proximity sensing device. The distance between them is inversely proportional; Figure 3 shows a schematic view of a low reflectivity object close to a conventional proximity sensing device; Figure 4 shows a reflected light signal when a low reflectivity object is very close to a conventional proximity sensing device. Figure 5 shows a schematic diagram of the components of the first preferred embodiment of the proximity sensing device of the present invention; Figure 6 shows a flow chart of the first preferred embodiment of the proximity sensing method of the present invention; Corresponding relationship between the light intensity value of the first reflected light signal reflected from the first light signal emitted by the first light-emitting element in the proximity sensing device of the first embodiment and the distance between the object and the proximity sensing device a first light intensity value curve S1, a light intensity value of the second reflected light signal reflected from the object by a second light signal emitted by the second light emitting element, and a distance between the object and the proximity sensing device One relationship between the second light intensity value curve S2, a first light intensity value and a curve S1 and a second light intensity value corresponding to the curve S2 a ratio curve S3; FIG. 8 is a schematic diagram showing that a low reflectivity object is close to the proximity sensing device of the first embodiment;

9 is a flow chart showing a second preferred embodiment of the proximity sensing method of the present invention; FIG. 10 is a flow chart showing a third preferred embodiment of the proximity sensing method of the present invention; and FIG. 11 is a view showing the proximity sensing device of the present invention. FIG. 12 is a flow chart showing a fourth preferred embodiment of the proximity sensing method of the present invention; FIG. 13 is a flow chart showing a fifth preferred embodiment of the proximity sensing method of the present invention; And FIG. 14 shows a flow chart of a sixth preferred embodiment of the proximity sensing method of the present invention.

S61~S68‧‧‧Steps

Claims (21)

A proximity sensing method, which presets a first first light-emitting element and a light sensor, and a second light-emitting element spaced apart from the light sensor by a predetermined distance, and the steps include: (A) Having the first light-emitting element emit a first light signal, so that the light sensor senses a first reflected light signal of the first light signal; (B) determining whether the intensity of the first reflected light signal is greater than a first a threshold value, if yes, determining that an object is close; (C) determining whether the intensity of the first reflected light signal is greater than a second threshold, and if not, causing the second light emitting element to emit a second light signal, such that The light sensor senses a second reflected light signal of the second optical signal, wherein the second critical value is less than or equal to the first critical value; and (D) determining the intensity of the first reflected light signal and the first Whether a ratio of the intensities of the two reflected optical signals is greater than a third critical value, and if so, it is determined that an object is close. According to the proximity sensing method of claim 1, in step (B), when it is determined that the intensity of the first reflected light signal is less than or equal to the first critical value, it is determined that no object is approaching. According to the proximity sensing method of claim 1 or 2, in the step (D), when it is judged that the ratio is less than or equal to the third threshold, it is determined that no object is approaching. According to the proximity sensing method of claim 3, in step (D), when it is determined that the ratio is less than or equal to the third threshold, the second illuminating element is turned off. According to the proximity sensing method of claim 1, in the step (D), the first light-emitting element and the second light-emitting element alternately emit the first light signal and the second light signal or simultaneously The first optical signal and the second optical signal are transmitted at different frequencies. A proximity sensing method, which presets a first first light-emitting element and a light sensor, and a second light-emitting element spaced apart from the light sensor by a predetermined distance, and the steps include: (A) Having the first light-emitting element emit a first light signal, so that the light sensor senses a first reflected light signal of the first light signal; (B) determining whether the intensity of the first reflected light signal is greater than a critical value a value, if yes, determining that an object is in proximity, and causing the second light emitting element to emit a second light signal, so that the light sensor senses a second reflected light signal of the second light signal; and (C) determining the Whether a ratio of the intensity of the first reflected light signal to the intensity of the second reflected light signal is greater than a predetermined value, and if so, it is determined that an object is close, otherwise it is determined that no object is close. A proximity sensing method, which presets a first first light-emitting element and a light sensor, and a second light-emitting element spaced apart from the light sensor by a predetermined distance, and the steps include: (A) Having the first light-emitting element and the second light-emitting element alternately emit a first light signal and a second light signal, so that the light sensor respectively senses a first reflected light signal of the first light signal, and Sensing a second reflected light signal of the second optical signal; and (B) determining the intensity of the first reflected light signal and the second reflected light signal Whether the ratio of the intensity of the number is greater than a predetermined value, and if so, it is determined that an object is close, otherwise it is determined that no object is close. A proximity sensing device comprising: a first illuminating element; a photo sensor adjacent to the first illuminating element; a second illuminating element spaced apart from the photo sensor by a predetermined distance; a controller Controlling the first light-emitting element to emit a first light signal, so that the light sensor senses a first reflected light signal of the first light signal; and a processor determining that the intensity of the first reflected light signal is greater than one When the first threshold value is determined, the object is determined to be close, and when the intensity of the first reflected light signal is determined to be less than or equal to a second threshold value, the controller controls the second light emitting component to emit a second light signal. The light sensor senses a second reflected light signal of the second optical signal, and the processor determines that the ratio of the intensity of the first reflected light signal to the intensity of the second reflected light signal is greater than a third At the critical value, it is determined that an object is close to; wherein the second critical value is less than or equal to the first critical value. According to the proximity sensing device of claim 8, wherein the processor initially determines that the intensity of the first reflected light signal is less than or equal to the first critical value, determining that no object is approaching. The proximity sensing device according to claim 8 or 9, wherein the processor determines that the ratio is less than or equal to the third threshold, and determines that no object is approaching. According to the proximity sensing device of claim 10, wherein the processor determines that the ratio is less than or equal to the third threshold, the control is The second light emitting element is turned off. The proximity sensing device of claim 8, wherein the controller controls the first light emitting element and the second light emitting element to alternately emit the second light emitting element when the second light emitting element emits the second light signal An optical signal and the second optical signal. The proximity sensing device of claim 8, wherein the second illuminating element is disposed on a side of the first illuminating element away from the photo sensor, and the proximity sensing device further comprises a a first light blocking mechanism between the first light emitting element and the photo sensor, and a second light blocking mechanism disposed on a side of the second light emitting element adjacent to the second light emitting element. A proximity sensing device comprising: a first illuminating element; a photo sensor adjacent to the first illuminating element; a second illuminating element spaced apart from the photo sensor by a predetermined distance; a controller Controlling the first light-emitting element to emit a first light signal, so that the light sensor senses a first reflected light signal of the first light signal; and a processor determining that the intensity of the first reflected light signal is greater than one a threshold value, determining that an object is close, and causing the controller to control the second light emitting component to emit a second light signal, so that the light sensor senses a second reflected light signal of the second light signal, and the When the processor determines that the ratio of the intensity of the first reflected light signal to the intensity of the second reflected light signal is greater than a predetermined value, it is determined that an object is close. A proximity sensing device comprising: a first light-emitting element; a light sensor adjacent to the first light-emitting element; a second light-emitting element spaced apart from the light sensor by a predetermined distance; a controller controlling the first light-emitting element and the The second light-emitting elements alternately emit a first optical signal and a second optical signal, so that the light sensor respectively senses a first reflected light signal of the first optical signal, and senses the second optical signal. a second reflected light signal; and a processor determining that the ratio of the intensity of the first reflected light signal to the intensity of the second reflected light signal is greater than a predetermined value, determining that an object is close, otherwise determining that there is no object Close. A proximity sensing method, which presets an adjacent one of the light emitting elements and a first photo sensor, and a second photosensor spaced apart from the light emitting element by a predetermined distance, and the steps include: (A) Having the light emitting element emit an optical signal, and the first light sensor is turned on to sense a first reflected light signal of the optical signal; (B) determining whether the intensity of the first reflected light signal is greater than a first criticality a value, if yes, determining that an object is close; (C) determining whether the intensity of the first reflected light signal is greater than a second threshold, and if not, turning on the second light sensor to sense the first signal a second reflected light signal, wherein the second critical value is less than or equal to the first critical value; and (D) determining whether a ratio of the intensity of the first reflected light signal to the intensity of the second reflected light signal is greater than a third The critical value, if it is, determines that an object is close. A proximity sensing method, which presets an adjacent one of the light emitting elements and a first photo sensor, and a second photosensor spaced apart from the light emitting element by a predetermined distance, and the steps include: (A) Having the light emitting element emit an optical signal, and the first light sensor is turned on to sense a first reflected light signal of the optical signal; (B) determining whether the intensity of the first reflected light signal is greater than a critical value, If yes, determining that an object is in proximity, and turning on the second photo sensor to sense a second reflected light signal of the optical signal; and (C) determining the intensity of the first reflected light signal and the second reflected light signal Whether a ratio of the intensity is greater than a predetermined value, and if so, it is determined that an object is close. A proximity sensing method, which presets an adjacent one of the light-emitting elements and a first light sensor, and a second light sensor spaced apart from the first light-emitting element by a predetermined distance, and the steps include: A) causing the illuminating element to emit an optical signal, and simultaneously turning on the first photo sensor and the second photo sensor to respectively sense a first reflected light signal and a second reflected light of the optical signal And (B) determining whether a ratio of the intensity of the first reflected light signal to the intensity of the second reflected light signal is greater than a predetermined value, and if so, determining that an object is close, otherwise determining that no object is approaching. A proximity sensing device includes: a light emitting element; a first light sensor adjacent to the first light emitting element; and a second light sensor spaced apart from the light emitting element by a predetermined distance; a controller controlling the light emitting element to emit an optical signal, and turning on the first light sensor to sense a first reflected light signal of the first optical signal; and a processor determining the first reflected light signal When the intensity is greater than a first threshold, determining that an object is close, and subsequently determining that the intensity of the first reflected light signal is less than or equal to a second threshold, causing the controller to turn on the second light sensor Sensing an object of the second reflected light signal of the optical signal, and the processor determines that the ratio of the intensity of the first reflected light signal to the intensity of the second reflected light signal is greater than a third threshold Close. A proximity sensing device comprising: a light emitting element; a first light sensor adjacent to the first light emitting element; a second light sensor spaced apart from the light emitting element by a predetermined distance; a controller Controlling the light emitting element to emit an optical signal, and turning on the first light sensor to sense a first reflected light signal of the first optical signal; and a processor determining that the intensity of the first reflected light signal is greater than one At a threshold value, determining that an object is close, and causing the controller to turn on the second photo sensor to sense a second reflected light signal of the optical signal, and the processor determines the intensity of the first reflected light signal and When a ratio of the intensity of the second reflected light signal is greater than a predetermined value, it is determined that an object is close. A proximity sensing device comprising: a light emitting element; a first photo sensor adjacent to the first illuminating element; a second photo sensor spaced apart from the illuminating element by a predetermined distance; a controller controlling the illuminating element to emit an optical signal and simultaneously turning on The first photo sensor and the second photo sensor respectively sense a first reflected light signal and a second reflected light signal of the optical signal; and a processor determines the first reflected light signal Whether the ratio of the intensity of the second reflected light signal to the intensity of the second reflected light signal is greater than a predetermined value, and if so, it is determined that an object is close, otherwise it is determined that no object is close.