TW201543009A - Electronic device and light sensing control method - Google Patents

Abstract

Disclosed is an electronic device having a light emitting electrode (LED), a light sensing control device and an electronic device main body. The light sensing control device includes a transmission gate and a control unit. The transmission gate receives a switch signal generated by the control unit in each duty cycle, and is controlled by the switch signal to switch the LED to a lighting mode and a sensing mode. In the sensing mode, the LED senses ambient brightness and generates a sensing voltage in relation to the ambient brightness. The transmission gate receives the sensing voltage and the control unit determines, based on the value of the sensing voltage, whether the period of change of the ambient brightness has exceeded a built-in preset time value, if yes, a control signal is generated. The electronic device main body then receives the control signal and is activated according to the control signal.

Description

Electrical equipment and light sensing method

The present invention relates to an apparatus and method, and more particularly to an electrical apparatus and a light sensing method.

With the development of technology, there will be fewer and fewer devices that require manual operation in life. Among them, light-sensing devices are widely used in life to replace manual operations, such as using light-sensing devices to control electronic products, and to adjust electronic devices. The function of the product, or the brightness of the light.

Referring to FIG. 1 , a conventional light sensing device 1 is combined with an electronic product (not shown) to control the electronic product by using light sensing. The light sensing device 1 includes a light emitting component 11 , a light detecting component 12 , and a Single wafer 13. The light-emitting element 11 has a grounded first end and a second end electrically connected to the single-chip 13. Generally, a light-emitting diode is used as the light-emitting element 11. The photodetecting element 12 has a grounded first end and a second end electrically connected to the single chip 13. The photodetecting element can be used, for example, as a photoresistor or a photodiode. In operation, the single chip 13 outputs a DC voltage to the light emitting element 11 to cause the light emitting element 11 to emit a light source for indicating a state. The light detecting element 12 senses an external light source to generate a signal, and the single chip 13 receives the signal. The signal is also judged to control the electronic product.

However, the existing light sensing device 1 has the disadvantage that the cost is high, and the light detecting element 12 and the line between the light detecting element 12 and the single chip 13 are additionally required, thereby additionally increasing the cost of the entire system. .

Accordingly, a first object of the present invention is to provide a cost effective electrical device.

Therefore, the electrical device of the present invention comprises: a light emitting diode switchable to a light emitting mode and a sensing mode, wherein the light emitting diode is used to indicate a use state; and in the sensing mode The light-emitting diode senses ambient brightness and generates an induced voltage related to ambient brightness; a light sensing device includes: a transmission gate electrically connecting the light-emitting diode and receiving a switching signal and receiving the switching signal Controlling, switching the light emitting diode to the light emitting mode and the sensing mode. In the sensing mode, the transmitting gate receives the induced voltage of the light emitting diode, and a control unit electrically connects the transmitting gate The switching signal is generated to the transmission gate in each working cycle, and determining whether the change time of the ambient brightness exceeds a predetermined time value of the memory according to the magnitude of the induced voltage, and if the change time exceeds the predetermined time value, and generating a a control signal; and an electrical body, electrically connected to the light sensing device to receive the control signal, and generating an action according to the control signal.

A second object of the present invention is to provide another cost effective electrical device.

The electrical device includes: a light emitting diode switchable to a light emitting mode and a sensing mode, wherein the light emitting diode is used to indicate a use state; and in the sensing mode, the light emitting diode The polar body senses the ambient brightness and generates an induced voltage related to the ambient brightness; a light sensing device includes: a transmission gate electrically connecting the light emitting diode and receiving a switching signal, and is controlled by the switching signal to cause the light to be emitted The diode is switched between the illumination mode and the sensing mode. In the sensing mode, the transmission gate receives the induced voltage of the LED, and a control unit electrically connects the transmission gate and operates at each duty cycle. The switching signal is generated to the transmission gate, and a control signal is generated according to the magnitude of the induced voltage; and an electrical body is electrically connected to the light sensing device to receive the control signal, and generates an action according to the control signal.

A third object of the present invention is to provide a cost effective light sensing control method.

The light sensing method is applicable to an electrical device, and the electrical device includes a light emitting diode that is switched between a light emitting mode and a sensing mode, a light sensing device electrically connected to the light emitting diode, and an electric device. An electrical appliance body connected to the light sensing device, and the light sensing method comprises: (A) providing the light sensing device in each working cycle a switching signal to control the light emitting diode to switch to the light emitting mode and the sensing mode; (B) when the light emitting diode is in the sensing mode, the light emitting diode senses ambient brightness and generates a correlation (C) receiving, by the light sensing device, the induced voltage from the light emitting diode, and determining, according to the magnitude of the induced voltage, whether a change time of the ambient brightness exceeds a predetermined time value of a memory; And (D) if the determination result of the step (C) is YES, the light sensing device is used to generate a control signal indicating the operation of the main body of the electric appliance, and is transmitted to the main body of the electric appliance.

A fourth object of the present invention is to provide another cost effective light sensing method.

The light sensing method is applicable to an electrical device, and the electrical device includes a light emitting diode that is switched between a light emitting mode and a sensing mode, a light sensing device electrically connected to the light emitting diode, and an electric device. An electronic device connected to the light sensing device, and the light sensing method comprises: (A) using the light sensing device to provide a switching signal during each working cycle to control the light emitting diode to switch to the light emitting mode and The sensing mode; (B) when the light emitting diode is in the sensing mode, the light emitting diode senses ambient brightness and generates an induced voltage related to ambient brightness; (H) receiving by the light sensing device The induced voltage from the light emitting diode, and generating a control signal indicating the operation of the main body of the electrical device according to the magnitude of the induced voltage; and (E) receiving the control signal by the main body of the appliance and generating an actuation based on the control signal.

The invention does not need to additionally provide a photo detecting component and related lines for sensing the brightness of the environment to control an electronic product, and has the effect of reducing cost compared with the prior art.

1‧‧‧Light sensing device

11‧‧‧Lighting elements

12‧‧‧Light detection components

13‧‧‧ single chip

2‧‧‧Lighting diode

3‧‧‧Light sensing device

31‧‧‧Transmission gate

310‧‧‧Control terminal

311‧‧‧ first end

312‧‧‧ second end

313‧‧‧ third end

32‧‧‧ analog digital conversion unit

33‧‧‧Control unit

331‧‧‧ counter

332‧‧‧ comparison table

34‧‧‧Output interface

4‧‧‧Lighting diode extinguishing control unit

5‧‧‧Electrical main body

51‧‧‧Backlight module

T‧‧‧ work cycle

t1‧‧‧The first period of time

t2‧‧‧Second time

A‧‧‧Switching steps

B‧‧‧Sensing steps

C‧‧‧judging steps

C1‧‧‧Digital conversion steps

C2‧‧‧Compare size steps

C3‧‧‧Add a statistical result step

C4‧‧‧Compare an update statistical result size step

C5‧‧‧Return to zero step

D‧‧‧Generation steps

E‧‧‧Action steps

F‧‧‧Do not move steps

G‧‧‧Glowing

H‧‧‧Control steps

H1‧‧‧Digital conversion steps

H2‧‧‧Table lookup steps

Other features and effects of the present invention will be apparent from the embodiments of the present invention, wherein: FIG. 1 is a circuit diagram illustrating a conventional light sensing device; and FIG. 2 is a circuit diagram illustrating one of the electrical devices of the present invention. The first preferred embodiment; FIG. 3 is a flow chart illustrating the first preferred embodiment performing a light sensing control method; and FIG. 4 is a schematic diagram showing the light emitting diode of the first preferred embodiment being Controlling, switching to an illumination mode and a sensing mode in each working cycle; FIG. 5 is a circuit diagram illustrating a second preferred embodiment of the electrical device of the present invention; and FIG. 6 is a flow chart illustrating the second The preferred embodiment performs another method of light sensing.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 2, a first preferred embodiment of the electrical device of the present invention controls the operation of the electrical device by sensing the brightness of the environment, and the electrical device includes a light emitting diode 2, a light sensing device 3, and a The light emitting diode extinguishing control unit 4 and an electric appliance main body 5. In this example, the electrical device is an electric fan.

The LED 2 includes an anode and a grounded cathode, and is switchable to an illumination mode and a sensing mode. When the light-emitting diode 2 is in the light-emitting mode, it receives a voltage and emits light, and is used to indicate a state of use. In this example, the light-emitting diode 2 emits light to indicate that the electric fan is in an open state. When the LED 2 is in the sensing mode, it does not emit light, and is used to sense ambient brightness and generate an induced voltage related to ambient brightness, which is inversely proportional to the degree of shading and proportional to the ambient brightness. Taking a red light-emitting diode as an example: when the red light-emitting diode is not shielded, the brightness of the environment is sensed, the induced voltage is 1.4 volts; when the red light-emitting diode is completely shielded, If the brightness of the environment is not sensed, the induced voltage is 0 volts. Therefore, the induced voltage of the red light-emitting diode varies from 0 volts to 1.4 volts depending on the degree of shielding.

The light sensing device 3 includes a transmission gate 31, an analog digital conversion unit 32, a control unit 33, and an output interface 34.

The transmission gate 31 has a control end 310, a first end 311, a second end 312, and a third end 313. The control terminal 310 receives a switching signal and is controlled by the switching signal to switch the line to make the first end 311 and the second end 312 conductive, or the first end 311 and the third end 313 are turned on. The first end 311 is electrically connected to the anode of the light emitting diode 2.

The analog to digital conversion unit 32 is electrically coupled to the third terminal 313 of the transfer gate 31.

The control unit 33 is electrically connected to the control terminal 310 of the transmission gate 31 and the analog digital conversion unit 32, and has a counter 331. The control unit 33 internally stores a predetermined ambient brightness change and a predetermined value of the digit, and a predetermined time value of the amount of time associated with the change in ambient brightness. The counter 331 stores a statistical result relating to the time at which the light-emitting diode 2 senses the change in the brightness of the environment.

The output interface 34 is electrically connected to the control unit 33.

The LED display control unit 4 is electrically connected to the second end 312 of the transmission gate 31.

The main body 5 of the electric device is electrically connected to the output interface 34 and the LED display control unit 4. In this example, the electrical body 5 is the internal mechanical structure of the electric fan.

Referring to FIG. 2 and FIG. 3, the electrical device performs a light sensing method, and the light sensing method includes the following steps:

Step A: Referring to FIG. 4, the control unit 33 provides the switching signal to the transmission gate 31 in each working cycle T to control the LED 2 to switch to the illumination mode and the sensing mode, that is, that in each working period T, the transmission gate 31 at time t ₁ a first section, such that the first end and the second end 311 through guide 312, if the appliance body 5 is operated state, from The voltage of the electric device body 5 is transmitted to the light-emitting diode 2 via the light-emitting diode display control unit 4 and the transfer gate 31, and the light-emitting diode 2 is illuminated. Step G: The transmission gate 31 turns on the first end 311 and the third end 313 at a second time t ₂ , and the LED 2 is in a dark state and starts to sense the ambient brightness. Test mode, which is step B. In this example, the electrical main body 5 is in an operating state, and the red light emitting diode indicates the state and senses the ambient brightness, and the control unit 33 outputs the switching signal to control the transmission gate 31 for the first time period t ₁ is 15/16 seconds, and the second time t ₂ is 1/16 second to switch, and the eye of the person can not detect the state in which the red light emitting diode is used to sense the ambient brightness.

Step B: when the light emitting diode 2 is in the sensing mode, the light emitting diode 2 senses the ambient brightness and generates the induced voltage of the relevant ambient brightness, that is, at the second time t ₂ , The light-emitting diode 2 starts sensing the ambient brightness and generates the induced voltage.

Step C: The induced voltage from the light-emitting diode 2 is received by the transmission gate 31, and the control unit 33 determines whether the change time of the ambient brightness exceeds the predetermined time value according to the magnitude of the induced voltage. And step C further includes the following sub-steps:

Sub-step C1: receiving the induced voltage by the transmission gate 31 and transmitting the induced voltage to the analog-to-digital conversion unit 32, the analog-to-digital conversion unit 32 analogizing the induced voltage to a proportional value to the induced voltage. Digital value signal. In this example, the analog-to-digital conversion unit 32 converts the induced voltage of the red light-emitting diode from 0 volts to 1.4 volts into a digital value signal of 0 to 100.

Sub-step C2: receiving the digital value signal by using the control unit 33 and comparing the digital value signal with the predetermined value to determine the ambient brightness Is there a change? In this example, the environment is in a bright state, and the LED is sensed to change the ambient brightness by shielding the LED, and the predetermined value is set to 7, which is equivalent to the induced voltage being 0.098 volts. About 0.1 volt, when the digital value signal is less than 7, the control unit 33 determines that the ambient brightness changes, that is, performs sub-step C3; otherwise, when the digital value signal is greater than 7, the control unit 33 determines that the ambient brightness does not occur. Change, ie perform sub-step C5.

Sub-step C3: When the control unit 33 determines that the ambient brightness has changed, the statistical result is increased by the counter 331 of the control unit 33 to obtain an update statistical result. In this example, when the light-emitting diode 2 is shielded and the induced voltage is less than 0.1 volt, the counter 331 increments the statistical result by one to obtain the updated statistical result.

Sub-step C4: The control unit 33 determines whether the update statistical result is greater than the predetermined time value. If the update statistical result is greater than the predetermined time value, step D is performed. In this example, the predetermined time value is set to 48, that is, the light-emitting diode is continuously shielded for 2 to 3 seconds, so that the induced voltage is less than 0.1 volt for 3 seconds: 3/(1/16)=48.

Sub-step C5: When the control unit 33 determines that the ambient brightness has not changed, the statistical result is zeroed by the counter 331 of the control unit 33. In this example, when the light-emitting diode 2 is not shielded and the induced voltage is greater than 0.1 volt, the counter 331 resets the statistical result back to zero.

Step D: If the update statistical result is greater than the predetermined time value in sub-step C4, the control unit 33 is used to generate a control signal indicating that the electrical main body 5 is actuated. In this example, when the illumination is continuously masked After the polar body 2 exceeds 3 seconds, the control unit 33 generates the control signal for controlling the start or stop of operation of the electric appliance main body 5.

Step E: The control unit 16 receives the control signal transmitted from the control unit 33 via the output interface 34, and starts to operate according to the control signal. In this example, the electric appliance main body 5 receives the control signal and is controlled to start or stop the operation.

Step F: If the update statistical result is less than the predetermined time value in sub-step C4, the control unit 33 does not generate the control signal, and the electrical main body 5 does not operate. In this example, the light-emitting diode 2 is not shielded or the light-emitting diode 2 is shielded for no more than 3 seconds, and the electrical main body 5 does not receive the control signal, so that no actuation occurs.

In addition, in this example, the control signal is matched with the output interface 34 to control various operations of the main body 5, such as controlling the electric fan to sway or change the rotation speed. It should be added that the method of this example can also be applied to an application for controlling a smart phone, which is used to shield the smart diode in the smart phone. The light-emitting diode 2 senses different induced voltages, thereby controlling the application in the smart phone.

Referring to FIG. 5, a second preferred embodiment of the electrical device of the present invention is similar to the first preferred embodiment except that the control unit 33 internally stores a look-up table 332 (Table 1) and does not have the counter 331. And the predetermined value and the predetermined time value are not stored, and the electrical main body 5 has a backlight module 51. In addition, the look-up table 332 records a plurality of control signals and digital values corresponding to each of the control signals. In this example, the electrical device is a mobile phone. The light-emitting diode 2 is used to indicate whether there is an incoming call: when there is an incoming call, the electrical main body 5 transmits the voltage to the light-emitting diode 2 via the light-emitting diode extinction control unit 4 and the transfer gate 31. The light-emitting diode 2 is caused to emit light; when there is no incoming call, the electrical device body 5 does not transmit the voltage to the light-emitting diode 2, so that the light-emitting diode 2 does not emit light, and the light-emitting diode 2 is used. The ambient brightness is measured to control the backlight brightness of the phone. The value of each digit recorded by the comparison table 332 is proportional to and corresponds to each induced voltage, and the induced voltage of the red LED is a variation from 0 volts to 1.4 volts, and the digit value corresponds to 0 to 100. Change between.

Referring to FIG. 5 and FIG. 6, similar to the first preferred embodiment, the electrical device of the second preferred embodiment performs the light sensing control method, which is different in the step H.

Step H: The induced voltage from the light-emitting diode 2 is received by the transmission gate 31, and the control unit 33 generates the control signal indicating that the main body 5 is activated according to the magnitude of the induced voltage. And step H further includes the following sub-steps:

Sub-step H1: receiving the induced voltage from the light-emitting diode 2 by using the transfer gate 31, and transmitting the analog voltage to the analog-to-digital conversion unit 32, and using the analog-to-digital conversion unit 32 to analogize the received induced voltage to digital conversion The digital value signal is proportional to the magnitude of the induced voltage.

Sub-step H2: receiving, by the control unit 33, the digital value signal, and performing a look-up table in the look-up table 332 according to the digital value signal to find the same digit value as the digital value signal, and generating the corresponding digital value control signal. After step H is performed, step E is performed.

In the second preferred embodiment, the comparison table 332 is shown in Table 1. The control signal is a current, and the backlight module 51 of the electrical device body 5 receives the control module 33 and transmits the signal through the output interface 34. The control signal is used to adjust the backlight brightness of the mobile phone. Therefore, the LED 2 senses the ambient brightness by itself, and the control unit 33 outputs the control signal to automatically adjust the backlight brightness of the mobile phone.

In summary, the above embodiment has the following advantages: the cost is reduced, and the light-emitting diode 2 can be used in two modes by using the light-emitting diode 2 and the switching fit of the control gate 31: The sensing mode of the induced voltage is generated by indicating the lighting mode of the state and the brightness of the sensing environment, and the electrical main body 5 is controlled by the control unit 33 according to the induced voltage. Compared with the prior art, no additional setting is needed. A light detecting component and associated circuitry are used to sense ambient brightness to control an electronic product, and indeed achieve the objectives of the present invention.

However, the above is only the preferred embodiment of the present invention. The scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the present invention in the scope of the invention and the patent specification are still within the scope of the invention.

2‧‧‧Lighting diode

3‧‧‧Light sensing device

31‧‧‧Transmission gate

310‧‧‧Control terminal

311‧‧‧ first end

312‧‧‧ second end

313‧‧‧ third end

32‧‧‧ analog digital conversion unit

33‧‧‧Control unit

331‧‧‧ counter

34‧‧‧Output interface

4‧‧‧Lighting diode extinguishing control unit

5‧‧‧Electrical main body

Claims (10)

An electrical device includes: a light emitting diode switchable to a light emitting mode and a sensing mode, wherein the light emitting diode is used to indicate a use state; and in the sensing mode, the light emitting device The diode senses the ambient brightness and generates an induced voltage related to the ambient brightness; a light sensing device includes: a transmission gate electrically connecting the light emitting diode and receiving a switching signal, and is controlled by the switching signal The light emitting diode is switched between the light emitting mode and the sensing mode. In the sensing mode, the transmitting gate receives the induced voltage of the light emitting diode, and a control unit electrically connects the transmitting gate and works for each The switching signal is generated in the cycle to the transmission gate, and determining whether the change time of the ambient brightness exceeds a predetermined time value of the memory according to the magnitude of the induced voltage, and if the change time exceeds the predetermined time value, and generating a control signal; And an electrical body, electrically connected to the light sensing device to receive the control signal, and generating an action according to the control signal. The electrical device of claim 1, wherein the light sensing device further comprises an analog digital conversion unit electrically connected to the transmission gate and the control unit to receive the induced voltage and analog to digital conversion of the induced voltage Forming a digital value signal proportional to the magnitude of the induced voltage, and transmitting the signal to the control unit, the control unit receiving the digital value signal and comparing the digital value signal with a predetermined value of a memory and a digit to determine that the environment is bright Whether there is a change in the degree, if there is a change, the statistical result stored therein is increased to obtain an updated statistical result, and it is judged whether the updated statistical result is greater than the predetermined time value, wherein the statistical result is related to the sense of the light emitting diode The time during which the ambient brightness changes is measured, the predetermined time value being related to the amount of time the ambient brightness changes. An electrical device includes: a light emitting diode switchable to a light emitting mode and a sensing mode, wherein the light emitting diode is used to indicate a use state; and in the sensing mode, the light emitting device The diode senses the ambient brightness and generates an induced voltage related to the ambient brightness; a light sensing device includes: a transmission gate electrically connecting the light emitting diode and receiving a switching signal, and is controlled by the switching signal The light emitting diode is switched between the light emitting mode and the sensing mode. In the sensing mode, the transmitting gate receives the induced voltage of the light emitting diode, and a control unit electrically connects the transmitting gate and works for each The switching signal is generated in the cycle to the transmission gate, and a control signal is generated according to the magnitude of the induced voltage; and an electrical body is electrically connected to the light sensing device to receive the control signal, and generates an action according to the control signal. The electrical device of claim 3, wherein the control unit stores a look-up table that records a plurality of control signals and digital values corresponding to each of the control signals. The electrical device of claim 4, wherein the light sensing device further comprises An analog digital conversion unit electrically connected to the transmission gate and the control unit to receive the induced voltage and analogically convert the induced voltage into a digital value signal proportional to the magnitude of the induced voltage, and the control unit receives the digital signal And a value signal, and according to the digital value signal, a look-up table is performed in the look-up table to find the same digit value as the digit value signal, and the control signal corresponding to the digit value is generated and transmitted to the electrical appliance body. A light sensing control method is applicable to an electrical device, comprising: a light emitting diode switched to a light emitting mode and a sensing mode, and a light sensing device electrically connected to the light emitting diode, and a Electrically connecting the main body of the light sensing device, and the light sensing method comprises: (A) using the light sensing device to provide a switching signal in each working cycle to control the switching of the LED to the lighting mode And the sensing mode; (B) when the light emitting diode is in the sensing mode, the light emitting diode senses ambient brightness and generates an induced voltage related to ambient brightness; (C) utilizing the light sensing device Receiving the induced voltage from the light emitting diode, and determining whether the change time of the ambient brightness exceeds a predetermined time value of the memory according to the magnitude of the induced voltage; (D) if the determination result of the step (C) is YES, then Using the light sensing device to generate a control signal indicating the operation of the main body of the appliance; and (E) receiving the control signal by the main body of the appliance, and generating an actuation according to the control signal. The light sensing method of claim 6, wherein the step (C) comprises: (C1) receiving, by the light sensing device, the induced voltage and analogizing the digital voltage to a digital value signal proportional to the magnitude of the induced voltage; (C2) using the light sensing device to Comparing a predetermined value of a memory and a digit to determine whether the ambient brightness changes; (C3) if the result of the step (C2) is YES, the statistical control device is used to increase a stored statistical result to obtain a Updating a statistical result, wherein the statistical result is related to a time when the light-emitting diode senses a change in brightness of the environment; and (C4) determining, by the light sensing device, whether the updated statistical result is greater than the predetermined time value, and the predetermined time value is related to the ambient brightness The amount of time of change, if the update statistics result is greater than the predetermined time value, then step (D) is performed. A light sensing control method is applicable to an electrical device, comprising: a light emitting diode switched to a light emitting mode and a sensing mode, and a light sensing device electrically connected to the light emitting diode, and a Electrically connecting the main body of the light sensing device, and the light sensing method comprises: (A) using the light sensing device to provide a switching signal in each working cycle to control the switching of the LED to the lighting mode And the sensing mode; (B) when the light emitting diode is in the sensing mode, the light emitting diode senses ambient brightness and generates an induced voltage related to ambient brightness; (H) utilizing the light sensing device Receiving the light from the light emitting diode Inducing a voltage, and generating a control signal indicating the operation of the main body according to the magnitude of the induced voltage; and (E) receiving the control signal by the main body of the electric appliance, and generating an action according to the control signal. The light sensing control method of claim 8, wherein the light sensing device stores a lookup table that records a plurality of control signals and digital values corresponding to each of the control signals. The light sensing method of claim 9, wherein the step (H) comprises the following substep: (H1) converting the induced voltage to analog to digital by the light sensing device to a proportional ratio to the induced voltage The digital value signal; and (H2) using the light sensing device to perform a look-up table in the look-up table according to the digital value signal to find the same digital value as the digital value signal, and generate the control signal corresponding to the digital value.