CN114063790A

CN114063790A - Non-contact keystroke device

Info

Publication number: CN114063790A
Application number: CN202010742648.1A
Authority: CN
Inventors: 林俊宏; 萧朝阳
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2022-02-18

Abstract

The invention mainly provides a non-contact keystroke device, which mainly comprises: the device comprises a circuit substrate, a plurality of proximity sensors, a plurality of light-emitting components, a microprocessor, an intermediate board, a display and a shading panel. According to the design of the present invention, the light-shielding panel is designed with a plurality of light-transmitting patterns for representing a plurality of keys, and the plurality of light-transmitting patterns respectively correspond to the plurality of proximity sensors. When a user approaches one light-transmitting pattern by one finger, the corresponding proximity sensor transmits a proximity sensing signal to the microprocessor, and the microprocessor controls the light-emitting component to emit colored light to indicate that the user finishes a non-contact keystroke operation. Therefore, the non-contact keystroke device of the invention can be applied to a main body device of an elevator, for example, so that the user can complete the input operation of floor selection without contacting a key when riding the elevator, thereby reliably achieving the effect of avoiding contact infection.

Description

Non-contact keystroke device

Technical Field

The invention relates to the technical field of keystroke devices (key input devices), in particular to a non-contact keystroke device.

Background

With the spread of new coronavirus epidemic, the number of deaths accumulated worldwide is rising. The current medical data indicate that the incubation period of the new coronavirus is 14 days, and thus, health authorities require that people suspected of being infected with the new coronavirus, or people who have been exposed to the carrier of the new coronavirus, must be quarantined and health managed for at least 14 days. During quarantine, the person receiving quarantine needs to be tracked by the health unit 2 times a day by telephone, and the body temperature and heart beat must be measured so that the health unit can master the health state. At the same time, it is also required that the quarantine recipient may not leave their quarantine area.

To avoid contact infection, the building administration agency typically covers the key strokes of the elevator with a transparent film (e.g., plastic wrap) that is replaced at intervals. In addition, a building administration committee can place a cup containing a plurality of toothpicks in the elevator, so that a user can pick up one toothpick to click a key of the keystroke device when taking the elevator. Furthermore, a building administration committee may place a bag containing a plurality of disposable plastic gloves in an elevator for a user to wear the disposable plastic gloves to click keys of a keystroke device when riding the elevator.

Indeed, all of the above approaches allow the user to press the keys to complete the floor number entry without touching the pointing device with his fingers, but the practical implementation level shows a number of drawbacks, as summarized below.

To avoid contact infection, most users can use toothpicks or disposable plastic gloves to click keys of the keystroke device in a non-contact way after entering the elevator. Unfortunately, a small percentage of users may use their fingers to click on the keys of the key device for convenience, and this becomes an epidemic breach.

Secondly, the large number of toothpicks and plastic gloves which are used once not only cause resource waste, but also lead to the continuous rise of epidemic prevention cost of the administration committee of the building for a long time.

From the above description, it can be seen that the existing solutions for the keys of a non-contact click keystroke device have many improvements. In view of the above, the inventors of the present invention have made intensive studies and finally developed a non-contact keystroke device according to the present invention.

Disclosure of Invention

The main object of the present invention is to provide a non-contact keystroke device, which mainly comprises: the device comprises a circuit substrate, a plurality of proximity sensors, a plurality of light-emitting components, a microprocessor, an intermediate board, a display and a shading panel. According to the design of the present invention, the light-shielding panel is designed with a plurality of light-transmitting patterns for representing a plurality of keys, and the plurality of light-transmitting patterns respectively correspond to the plurality of proximity sensors. When a user approaches one light-transmitting pattern by one finger, the corresponding proximity sensor transmits a proximity sensing signal to the microprocessor, and the microprocessor controls the light-emitting component to emit colored light to indicate that the user finishes a non-contact keystroke operation. Therefore, the non-contact keystroke device of the invention can be applied to a main body device of an elevator, for example, so that the user can complete the input operation of floor selection without contacting a key when riding the elevator, thereby reliably achieving the effect of avoiding contact infection.

It should be understood that under the condition of adopting the non-contact keystroke device of the invention, the management committee of the building does not need to put toothpicks and/or disposable plastic gloves in the elevator, thereby avoiding resource waste and greatly reducing the epidemic prevention cost of the management committee of the building.

In addition to its application to elevators, the non-contact keystroke device of the present invention can also be applied to other body devices, such as: an elevator, an interactive multimedia machine (KIOSK), a vending machine, a doorway machine, an electronic door lock, a cash dispenser, or a card swipe machine.

Therefore, to achieve the above objects, the present invention provides an embodiment of the non-contact keystroke device, which is applied in a main device and comprises:

a circuit substrate;

a plurality of Proximity sensors (Proximity sensors) disposed and arranged on a surface of the circuit substrate;

a plurality of light emitting elements disposed on the surface of the circuit substrate such that at least one side of each of the proximity sensors is adjacently disposed with at least one of the light emitting elements;

a microprocessor disposed on the surface of the circuit substrate and coupled to the proximity sensors;

the intermediate board is arranged on the circuit substrate and is provided with a plurality of accommodating grooves for accommodating the proximity sensors respectively;

a display, disposed on the intermediate board and electrically connected to the circuit substrate via an electrical connector, so as to be coupled to the microprocessor; and

a shading panel arranged on the intermediate plate and provided with a plurality of clicking blocks respectively corresponding to the proximity sensors and a light-transmitting block corresponding to the display; wherein, each of the clicking blocks is provided with a light-transmitting pattern, so that the plurality of light-transmitting patterns represent a plurality of keys, and the light-transmitting pattern is any one of the following: chinese, English, letter, number, or symbol;

when a plurality of objects are close to the shading panel, each proximity sensor transmits a proximity sensing signal to the microprocessor, so that the microprocessor calculates a distance value between each object and the shading panel according to a plurality of object distance sensing signals, and then finds out a closest distance from the plurality of distance values, wherein the closest distance is between one light-transmitting pattern of the shading panel and one object closest to the light-transmitting pattern;

the microprocessor controls the light-emitting component to emit a first color light when the nearest distance appears, controls the light-emitting component to emit a second color light when the nearest distance continuously appears for a specific time, and controls the display to display an image which is the same as the light-transmitting pattern.

In a possible embodiment, the host device is any one of the following: elevators, escalators, interactive multimedia machines (KIOSK), vending machines, doorway machines, electronic door locks, cash dispensers, or card skimmers.

In a possible embodiment, the light emitting element is any one of the following: a Quantum dot light-emitting diode (QLED), a submillimeter light-emitting diode (Mini-LED), a micro-LED, or an Organic light-emitting diode (OLED).

In one embodiment, the closest distance is between 1 cm and 3 cm. And a groove depth of the accommodating groove is greater than a height of the proximity sensor, so that a gap (air gap) is formed between one surface of the proximity sensor and the shading panel.

In a practical embodiment, the non-contact keystroke device of the present invention further comprises a back cover for combining with the light-shielding panel to form a container, so as to contain the circuit substrate, the proximity sensors, the light-emitting elements, the microprocessor, and the interposer therein.

In one embodiment, the microprocessor includes:

a light emitting component control unit for controlling each light emitting component to emit the first color light or the second color light;

a proximity sensor control unit for controlling the proximity sensors to perform proximity sensing on the objects, so as to correspondingly receive the proximity sensing signals transmitted by the proximity sensors;

a timing unit for starting to calculate the specific time after the occurrence of the closest distance; and

a distance comparison unit for comparing the distance values to find the nearest distance from the distance values.

In a possible embodiment, the microprocessor further comprises: and the oil stain detection unit is used for enabling the microprocessor to execute an oil stain detection mode, further calculating the transmittance of each light-transmitting pattern according to the near object sensing signals transmitted by the proximity sensors, and enabling the microprocessor to control the display to display transmittance indication information.

In a possible embodiment, the transmittance indication information is any one of the following: chinese characters, English characters, letters, symbols, or transmittance bars.

In a possible embodiment, the aforementioned keystroke device further comprises a buzzer disposed on the surface of the circuit substrate and coupled to the microprocessor, for sounding at least one buzzer when the shortest distance is generated between a specific light-transmitting pattern and an object; wherein the specific transparent pattern is used for representing an input confirmation.

In a practical embodiment, the aforementioned keystroke device further includes a wireless communication unit disposed on the surface of the circuit substrate and coupled to the microprocessor, so that an external electronic device can communicate with the microprocessor through the wireless communication unit, thereby performing a keystroke operation on the keystroke device.

In one embodiment, the electronic device may be any one of the following: a smart phone, a tablet computer, a laptop computer, or a smart watch.

In one embodiment, the proximity sensor includes:

a substrate;

a light emitting unit disposed on the substrate;

at least one optical sensing module arranged on the substrate and having functions of ambient light sensing and near object sensing; and

the accommodating body is combined to the substrate and is provided with an accommodating space for accommodating the light-emitting unit and the at least one optical sensing module;

the optical sensing module receives a reflected light from the object through the light receiving opening.

In one embodiment, the optical sensing module is any one of: the sensor comprises an ambient light sensing chip, a near object sensing chip or an electronic chip which has both an ambient light sensing function and a near object sensing module.

In one embodiment, the light emitting unit includes at least one light emitting device to emit an Infrared light (Infrared light) as the detection light, and the light emitting device is a Vertical Cavity Surface Emitting Laser (VCSEL), a Quantum dot light emitting diode (QLED), a sub-millimeter light emitting diode (Mini-LED), a micro-light emitting diode (micro-LED), or an Organic Light Emitting Diode (OLED).

In an embodiment, a partition board is disposed in the accommodating space for separating the light emitting unit from the optical sensing module.

Drawings

Fig. 1 shows a perspective view of an elevator equipped with a non-contact keystroke device of the present invention;

FIG. 2A is a perspective view of the non-contact keystroke device of the present invention;

FIG. 2B shows another perspective view of the non-contact keystroke device of the present invention;

FIG. 2C shows a front view of the non-contact keystroke device of the present invention;

FIG. 3 is an exploded perspective view of the non-contact keystroke device of the present invention;

FIG. 4 is a block diagram of a circuit substrate, proximity sensors, a microprocessor, a display, and light emitting elements;

FIG. 5 shows a perspective view of a circuit substrate, proximity sensors, a microprocessor, light emitting elements, and objects;

FIG. 6 shows a side view of a non-contact keystroke device of the present invention with a plurality of objects;

FIG. 7 shows a side view of a non-contact keystroke device of the present invention with a plurality of objects;

FIG. 8 shows a perspective view of an interposer, a light blocking panel, and a proximity sensor; and

FIG. 9 is a block diagram of a circuit substrate, proximity sensors, a microprocessor, a display, and light emitting elements.

The main symbols in the figures illustrate:

1: non-contact keystroke device

10: circuit board

11 proximity sensor

111 base plate

112 light emitting unit

113 optical sensing module

114 container

115 partition board

12 microprocessor

121 light emitting element control unit

Proximity sensor control unit 122

123 timing unit

124 distance comparing unit

125 oil contamination detection unit

13 intermediate plate

131 a receiving groove

14 display

15 light-shading panel

151 clicking block

152 transparent block

15P transparent pattern

16 light emitting module

17 buzzer

18 wireless communication unit

2 main body device

3B object

4: electronic device

LO light-out opening

LR light-receiving opening

101 electric connector

41 virtual case group

Detailed Description

In order to more clearly describe the non-contact keystroke device of the present invention, the following description will be made in detail with reference to the accompanying drawings.

Referring to fig. 1, there is shown a perspective view of an elevator equipped with a non-contact keystroke device of the present invention. Also, FIG. 2A shows a perspective view from one perspective of the non-contact keystroke device of the present invention, FIG. 2B shows a perspective view from another perspective of the non-contact keystroke device of the present invention, and FIG. 2C shows a front view of the non-contact keystroke device of the present invention. FIG. 3, on the other hand, shows an exploded perspective view of the non-contact keystroke device of the present invention.

The non-contact keystroke device 1 of the present invention is applied to a main body device 2 such as an elevator, and mainly comprises: a circuit substrate 10, Proximity sensors (Proximity sensors) 11, light emitting elements 16, a microprocessor 12, an interposer 13, a display 14, and a light shielding panel 15. The proximity sensors 11 are disposed and arranged on a surface of the circuit substrate 10, and the light emitting elements 16 are also disposed on the surface of the circuit substrate 10, such that at least one side of each proximity sensor 11 is adjacent to at least one of the light emitting elements 16. On the other hand, the microprocessor 12 is disposed on the surface of the circuit substrate 10 and coupled to the proximity sensors 11. More specifically, the interposer 13 is disposed on the circuit substrate 10 and has a plurality of receiving slots 131 for respectively receiving the proximity sensors 11 therein. The display 14 is disposed on the interposer 13 and electrically connected to the circuit substrate 10 through an electrical connector 101, so as to be coupled to the microprocessor 12.

In particular, the light-shielding panel 15 is disposed on the intermediate plate 13. As shown in fig. 2C and fig. 3, the light-shielding panel 15 has a plurality of clicking blocks 151 respectively corresponding to the proximity sensors 11 and a light-transmitting block 152 corresponding to the display 14. It should be noted that a transparent pattern 15P is disposed in each of the clicking blocks 151, so that a plurality of keys are represented by a plurality of transparent patterns 15P. In a possible embodiment, the transparent pattern 15P can be a Chinese character, an English character, a letter, a number, or a symbol. For example, fig. 2C shows that the plurality of light-transmitting patterns 15P include numbers, english words, letters, and symbols.

Please refer to fig. 4, fig. 5 and fig. 6. Fig. 4 shows a block diagram of the circuit substrate 10, the proximity sensors 11, the microprocessor 12, the display 14, and the light-emitting elements 16, fig. 5 shows a perspective view of the circuit substrate 10, the proximity sensors 11, the microprocessor 12, the light-emitting elements 16, and the objects 3B, and fig. 6 shows a side view of the non-contact keystroke device 1 and the objects 3B of the present invention. According to the design of the present invention, the microprocessor 12 is internally provided with a light emitting device control unit 121, a proximity sensor control unit 122, a timing unit 123, and a distance comparison unit 124. With such a design, when a plurality of objects 3B (e.g., fingers) approach the light-shielding panel 15, the Proximity sensor control unit 122 controls the Proximity sensors 11 to perform Proximity sensing on the plurality of objects 3B, so that each Proximity sensor 11 transmits a Proximity sensing signal (Proximity signal) to the microprocessor 12. Continuously, the microprocessor 12 calculates a distance value between each object 3B and the light-shielding panel 15 according to the object distance sensing signals, and then the distance comparing unit 124 performs a distance comparison on the distance values, thereby finding the closest distance from the distance values.

In brief, as shown in fig. 6, in the process that the user brings his index finger (i.e., one of the objects 3B) close to one specific light-transmitting pattern 15P on the light-shielding panel 15, the other fingers of the user will also simultaneously approach the other light-transmitting patterns 15P on the light-shielding panel 15. For example, FIG. 6 shows that the index finger is 2-3 cm away from the light-shielding panel 15, and the middle, ring and little fingers are 5-8 cm, 8-9 cm and 9-10 cm away from the light-shielding panel 15. In this case, in order to effectively identify the transparent pattern 15P that the user really wants to click, the present invention specifically provides the distance comparing unit 124 inside the microprocessor 12, so that the distance comparing unit 124 performs a distance comparison on the plurality of distance values, thereby finding the closest distance from the plurality of distance values, the closest distance being between one of the transparent patterns 15P of the light-shielding panel 15 and one of the objects 3B (i.e., the index finger shown in fig. 6) closest to the transparent pattern 15P. In a possible embodiment, the invention sets the closest distance to be within an allowable range of 1 cm to 3 cm. In other words, only when the distance between the user's finger and a specific light-transmitting pattern 15P of the light-shielding panel 15 falls within the allowable range, the microprocessor 12 determines that the specific light-transmitting pattern 15P is the one that the user wants to click.

FIG. 7 shows a side view of the non-contact keystroke device 1 of the present invention with a plurality of objects 3B. As can be seen by comparing fig. 6 and fig. 7, fig. 6 illustrates that the user uses the standard key selection method to complete a non-contact selection of a transparent pattern 15P on the light-shielding panel 15, whereas fig. 7 illustrates that the user uses the Casual (cash) key selection method to complete a non-contact selection of a transparent pattern 15P on the light-shielding panel 15. As shown in FIG. 7, the distance between the index finger of the user and the light-shielding panel 15 is 2-3 cm, and the distance between the middle finger, the ring finger and the little finger and the light-shielding panel 15 is 4-5 cm, 3.5-4.5 cm and 3-4 cm, respectively. In this case, the microprocessor 12 can still successfully recognize which of the light-transmitting patterns 15P the user clicks is because the distance between the index finger of the user and the light-shielding panel 15 falls within the aforementioned allowable range.

According to the design of the present invention, the light emitting device control unit 121 controls the light emitting device 16 to emit a first color light when the closest distance occurs. This is designed to let the user know that the system has detected a non-contact click made on a transparent pattern 15P on the light-shielding panel 15. Then, after the nearest distance continuously appears for a specific time, the light-emitting device control unit 121 controls the light-emitting device 16 to emit a second color light, and the microprocessor 12 controls the display 14 to display an image identical to the transparent pattern 15P. It should be understood that the present invention is provided with the timing unit 123 inside the microprocessor 12, which is used to start calculating the specific time after the occurrence of the closest distance. In a possible embodiment, the specific time is 1-3 seconds. In other words, after the index finger of the user approaches the light-shielding panel 15 and the distance between the index finger and one of the light-transmitting patterns 15P is between 1 cm and 3 cm, the light-emitting element 16 emits a first color light to inform the user that the index finger has been sensed. Further, after the index finger of the user stays in front of the transparent pattern 15P for 1-3 seconds, the light emitting component 16 emits a second color light to inform the user that a non-contact type click performed by the index finger is completed.

It should be noted that, as shown in fig. 3 and 4, the keystroke device 1 further includes a buzzer 17 disposed on the surface of the circuit substrate 10 and coupled to the microprocessor 12 for sounding at least one buzzer when the closest distance is generated between a specific light-transmitting pattern 15P and an object 3B; wherein the specific transparent pattern 15P is used to indicate an input confirmation. That is, after the user clicks the number of the transparent patterns 15P, if the user continues to click the input confirmation (Enter) transparent patterns 15P, the buzzer 17 sounds at least one buzzer to inform the user that the input of the floor selection is completed.

In possible embodiments, the light emitting element 16 may be any one of the following: a Quantum dot light-emitting diode (QLED), a submillimeter light-emitting diode (Mini-LED), a micro-LED, or an Organic light-emitting diode (QLED). In addition, when the non-contact keystroke device of the present invention is implemented, a back cover (not shown) may be further designed to combine with the light-shielding panel 15 to form a container, so as to accommodate therein the circuit substrate 10, the proximity sensors 11, the light-emitting elements 16, the microprocessor 12, the buzzer 17, and the interposer 13.

With continuing reference to FIG. 3 and with further reference to FIG. 8, there is shown a perspective view of the interposer 13, the light blocking panel 15 and a proximity sensor 11. In fig. 8, the proximity sensor 11 is presented in a perspective cut-away manner, thereby showing that the proximity sensor 11 includes: a substrate 111, a light emitting unit 112, at least one optical sensing module 113, and a receiving body 114. The light emitting unit 112 is disposed on the substrate 111, and the optical sensing module 113 is disposed on the substrate 111. In a possible embodiment, the optical sensing module 113 is an electronic chip having an ambient light sensing function and a near object sensing module. On the other hand, the accommodating body 114 is coupled to the substrate 111 and has an accommodating space for accommodating the light emitting unit 112 and the at least one optical sensing module 113 therein. It should be noted that a top surface of the accommodating body 114 is provided with an light-emitting opening LO and a light-receiving opening LR, so that the light-emitting unit 112 provides a detection light through the light-emitting opening LO to the object 3B, and the optical sensing module 113 receives a reflected light from the object 3B through the light-receiving opening LR.

It should be noted that, a groove depth of the accommodating groove 131 is greater than a height of the proximity sensor 11, so that a gap (Air gap) is formed between a surface of the proximity sensor 11 and the light-shielding panel 15, which is beneficial for the detection light to be emitted to the object 3B, and also beneficial for the reflected light to be received by the optical sensing module 113 through the light receiving opening LR. Furthermore, as shown in fig. 8, a partition 115 is disposed inside the accommodating body 114 for separating the light emitting unit 112 from the optical sensing module 11. In some embodiments, the light emitting unit 112 includes at least one light emitting device for emitting an Infrared light (Infrared light) as the detection light, and the light emitting device is a Vertical Cavity Surface Emitting Laser (VCSEL), a quantum dot light emitting diode (QLED), a submillimeter light emitting diode (Mini-LED), a micro light emitting diode (Mirco-LED), or an Organic Light Emitting Diode (OLED).

Please refer to fig. 9, which shows a block diagram of the circuit substrate 10, the proximity sensors 11, the microprocessor 12, the display 14, and the light emitting elements 16, wherein fig. 9 shows that an oil detecting unit 125 is further disposed inside the microprocessor 12 for enabling the microprocessor 12 to execute an oil detecting mode, further calculating a transmittance of each light-transmitting pattern 15P according to the proximity sensing signal transmitted by each proximity sensor 11, and enabling the microprocessor 12 to control the display 14 to display a transmittance indication message. In a possible embodiment, the transmittance indication information is any one of the following: chinese characters, English characters, letters, symbols, or transmittance bars. For example, the engineer or maintenance personnel can know the current contamination level of the light shielding panel 15 through a light transmission metric bar displayed by the display 14, and then wipe and clean the light shielding panel 15 when necessary, so as to maintain the light transmission of each light transmission pattern 15P and ensure a proximity sensing sensitivity of the proximity sensors 11.

Fig. 9 also shows that the keystroke device 1 further includes a wireless communication unit 18 disposed on the surface of the circuit substrate 10 and coupled to the microprocessor 12, so that an external electronic device 4 can communicate with the microprocessor 12 via the wireless communication unit 18, thereby performing a keystroke operation on the keystroke device 1. For example, the user can download an application (App) on his smart phone (i.e., the electronic device 4) for controlling the touch-less keystroke device 1 of the present invention, which displays a virtual keystroke set 41 on the user's smart phone. Then, the user can press the keys of the virtual key set 41 to perform a one-click operation on the non-contact keystroke device 1 of the present invention without approaching the light-shielding panel 15 with his finger. In a possible embodiment, the electronic device 4 may be any one of the following: a smart phone, a tablet computer, a laptop computer, or a smart watch.

As is known, fig. 1 shows a perspective view of an elevator equipped with a non-contact keystroke device of the present invention. The contactless keystroke device 1 of the present invention is not, however, limited to its application in elevators. As is known, many main devices 2 need to be equipped with a keystroke device, for example, an elevator, an interactive multimedia platform (KIOSK), a vending machine, a door machine, an electronic door lock, a cash dispenser, or a card swiping machine. Therefore, these main devices 2 can use the non-contact keystroke device of the present invention to replace the original keystroke device, so that the user can complete one-click operation through the non-contact keystroke method.

Thus, the foregoing has been a complete and clear description of the non-contact keystroke device disclosed herein. It should be emphasized that the above detailed description is specific to possible embodiments of the invention, but this is not to be taken as limiting the scope of the invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the invention are intended to be included within the scope of the invention.

Claims

1. A non-contact keystroke device applied in a main device comprises:

a circuit substrate;

a plurality of proximity sensors disposed and arranged on a surface of the circuit substrate;

2. The keystroke contactless device of claim 1 wherein the host device is any of: elevators, escalators, interactive multimedia machines, vending machines, doorway machines, electronic door locks, cash dispensers, or card readers.

3. The keystroke device of claim 1 wherein the light-emitting element is any one of: quantum dot light emitting diodes, sub-millimeter light emitting diodes, micro light emitting diodes, or organic light emitting diodes.

4. The touch-less keystroke device of claim 1 wherein said closest distance is between 1 cm and 3 cm.

5. The keystroke device of claim 1, wherein a depth of the receiving cavity is greater than a height of the proximity sensor, such that a gap is defined between a surface of the proximity sensor and the light-shielding panel.

6. The keystroke device of claim 1, further comprising a back cover for combining with the light-shielding panel to form a receptacle for receiving the circuit substrate, the proximity sensors, the light-emitting elements, the microprocessor, and the interposer therein.

7. The keystroke contactless device of claim 1 wherein the microprocessor comprises:

a proximity sensor control unit for controlling the proximity sensors to perform a proximity sensing on the objects, thereby generating a plurality of proximity sensing signals correspondingly;

8. The keystroke contactless device of claim 6 wherein the microprocessor further comprises:

and the oil stain detection unit is used for enabling the microprocessor to execute an oil stain detection mode, further calculating the transmittance of each light-transmitting pattern according to the near object sensing signals transmitted by the proximity sensors, and enabling the microprocessor to control the display to display transmittance indication information.

9. The keystroke non-contact of claim 8 wherein the transmittance indication is any of: chinese characters, English characters, letters, symbols, or transmittance bars.

10. The keystroke device of claim 8, further comprising a buzzer disposed on the surface of the circuit substrate and coupled to the microprocessor for sounding at least one beep when the closest distance between a particular light-transmissive pattern and an object is reached; wherein the specific transparent pattern is used for representing an input confirmation.

11. The keystroke device of claim 8, further comprising a wireless communication unit disposed on the surface of the circuit substrate and coupled to the microprocessor, so that an external electronic device can communicate with the microprocessor via the wireless communication unit to perform a keystroke operation on the keystroke device.

12. The keystroke contactless device of claim 11 wherein the electronic device is any of: a smart phone, a tablet computer, a laptop computer, or a smart watch.

13. The touch-less keystroke device of claim 1 wherein the proximity sensor comprises:

a substrate;

a light emitting unit disposed on the substrate;

14. The keystroke device of claim 13, wherein the optical sensing module is any one of: the sensor comprises an ambient light sensing chip, a near object sensing chip or an electronic chip which has both an ambient light sensing function and a near object sensing module.

15. The keystroke device of claim 13, wherein the light-emitting unit comprises at least one light-emitting element for emitting an infrared light as the detection light, and the light-emitting element is a VCSEL, a quantum dot LED, a submillimeter LED, a micro-LED, or an OLED.

16. The keystroke device of claim 13, wherein a partition is disposed in the space for separating the light-emitting unit from the optical sensor module.