TWI438595B - Light source flicker detection circuit and method - Google Patents

Description

Light source flicker detection circuit and method

The invention relates to a detection circuit and a detection method, and more particularly to a light source flicker detection circuit and method.

Press, when the ambient light is not the natural light and the indoor light provided by the electric light, the indoor light will generate flicker due to the supply frequency of the power supply to the electric lamp, and the common flashing frequency is 50 Hz or 60 Hz. Many electronic devices are now affected by the flicker of the light source, such as the flicker of the light source, which affects the brightness of the image produced by the image capturing device. Therefore, in some electronic devices, de-flicker processing is required, for example, the flicker-removing process is performed in the image sensor of the image capturing device. The general method of eliminating the flicker by the image capturing device is to adjust the exposure time. When the power supply frequency is 50 Hz, the exposure time is adjusted to an integral multiple of 1/100 second. When the power supply frequency is 60 Hz, the exposure time is adjusted to 1/120 second. Integer multiple.

It is necessary to know the flicker frequency of the light source before performing the flicker removal process. There are several ways to know the flashing frequency of a light source. The first method is to determine the blinking frequency of the light source according to the sold area of the electronic device, for example, according to the selling area of the electronic device (digital camera, digital camera, monitor, etc.) equipped with the image capturing device. The electronic device, for example 50 Hz or 60 Hz, eliminates flicker for a preset frequency because the supply frequency of the power source in the fixed area is fixed and does not change. However, users may carry electronic devices to travel abroad across regions, so this type of The way you can't really know the flashing frequency of the light source.

Another method is to set a power frequency detecting circuit in the electronic device. The power frequency detecting circuit detects that the power supply frequency is 50 Hz or 60 Hz, and eliminates flicker for 50 Hz or 60 Hz according to the detection result. The limitation of this method is that the electronic device must use a local power source. However, if portable electronic devices, such as digital cameras, digital cameras, and notebook computers, use the power provided by the battery instead of the local power source, the frequency information of the local power source cannot be obtained, and it is impossible to know. The flicker frequency of the light source, in turn, does not correspondingly eliminate flicker.

Therefore, how to solve the above problem is to propose a novel light source flicker detecting circuit, which can surely know the flicker frequency of the light source, so as to solve the above problem.

One of the objectives of the present invention is to provide a light source flicker detecting circuit and method for knowing the flicker frequency of ambient light by determining whether a sampling frequency corresponds to one of the ambient light flicker frequencies.

One of the objectives of the present invention is to provide a light source flicker detecting circuit and method for knowing the flicker frequency of ambient light by judging whether the sampling frequency is synchronized with the flicker frequency of the ambient light.

One of the objectives of the present invention is to provide a light source flicker detecting circuit and method for determining whether the sampling frequency corresponds to the flicker frequency of ambient light by counting the number of chopping waves, and knowing the flicker frequency of the ambient light.

An object of the present invention is to provide a light source flicker detecting circuit and method for determining sampling according to a first difference sum value corresponding to a first sampling frequency and a second difference sum value corresponding to a second sampling frequency. Whether the frequency corresponds to the flicker frequency of the ambient light, and the flicker frequency of the ambient light is known.

An object of the present invention is to provide a light source flicker detecting circuit and method, which is based on a first sampling frequency corresponding to a first chopping difference sum value and a second sampling frequency corresponding to a second chopping difference sum The value determines whether the sampling frequency corresponds to the flicker frequency of the ambient light, and the flicker frequency of the ambient light is known.

The light source flicker detecting circuit of the present invention comprises a light detecting unit and a signal processing unit. The light detecting unit is configured to detect an ambient light to generate a detecting signal; and the signal processing unit is coupled to the light detecting unit, and converts the detecting signal according to a sampling frequency to generate at least one detecting data to obtain the ambient light. One of the flicker frequencies is known according to the detected data to determine whether the sampling frequency corresponds to the flicker frequency of the ambient light. Thus, the present invention knows the blinking frequency of the ambient light by determining whether the sampling frequency of the signal processing unit corresponds to the flicker frequency of the ambient light. Furthermore, the signal processing unit of the light source flicker detecting circuit of the present invention determines whether the sampling frequency is synchronized with the flicker frequency according to the detected data to know the flicker frequency of the ambient light, thereby eliminating the flicker phenomenon.

In addition, the light source flicker detecting circuit of the present invention further includes a control circuit. The control unit is coupled to the signal processing unit, and controls the sampling frequency of the signal processing unit according to the detection data, so that the sampling frequency corresponds to the blinking frequency of the ambient light. The control unit can count the number of Ripples of the detected data. When the number of chopping waves is greater than a threshold, the control unit switches the sampling frequency of the signal processing unit.

Moreover, the signal processing unit further includes a counting unit. The counting unit counts the number of Ripples of the detected data to generate a counting result, and transmits the counting result to the control unit, and the control unit determines, according to the counting result, that the number of the chopping waves is greater than a threshold value. Then, the sampling frequency of the signal processing unit is switched.

this invention:

1‧‧‧Light source flicker detection circuit

10‧‧‧Light detection unit

20‧‧‧Signal Processing Unit

22‧‧‧ analog digital conversion unit

24‧‧‧counting unit

30‧‧‧Control unit

40‧‧‧Image capture unit

50‧‧‧First waveform

60‧‧‧second waveform

The first figure is a block diagram of a preferred embodiment of the present invention; The second diagram is a schematic diagram of the sampling frequency corresponding to the blinking frequency of the present invention; the second diagram B is a schematic diagram of the sampling frequency of the present invention not corresponding to the blinking frequency; and the third figure is another preferred embodiment of the present invention. 4 is a block diagram of another preferred embodiment of the present invention; a fifth diagram is a table for detecting data according to a preferred embodiment of the present invention; and a sixth diagram is a fourth diagram; A waveform diagram of the detected data of a preferred embodiment; FIG. 7A is a waveform diagram of the detected data of the first sampling frequency according to a preferred embodiment of the present invention; and FIG. 7B is a waveform of the present invention A waveform diagram of the detected data of the second sampling frequency of another preferred embodiment.

In order to provide a better understanding and understanding of the structural features and the efficacies of the present invention, please refer to the preferred embodiment and the detailed description, as explained below: please refer to the first figure. A block diagram of a preferred embodiment of the invention. As shown in the figure, the light source flicker detecting circuit 1 of the present invention comprises a light detecting unit 10 and a signal processing unit 20. The light detecting unit 10 is configured to detect an ambient light to generate a detecting signal. In this embodiment, the light detecting unit 10 is a photo diode, and the light diode can detect the ambient light source. The ambient light is converted into a telecommunication signal (ie, a detection signal). The signal processing unit 20 is coupled to the light detecting unit 10 to receive the detection signal output by the light detecting unit 10. The signal processing unit 20 converts the detecting signal according to the at least one sampling frequency fs to generate at least one detected data. Knowing one of the ambient light flickering frequencies, wherein the present invention determines the flicker frequency of the ambient light by determining whether the sampling frequency fs corresponds to the flicker frequency according to the detected data, and in the present invention, processing the detecting capital It is known whether the sampling frequency fs corresponds to the flicker frequency of the ambient light.

Please refer to the second A picture and the second B picture together, which is a schematic diagram of the sampling frequency corresponding to the blinking frequency and the sampling frequency does not correspond to the blinking frequency. As shown in the figure, when the sampling frequency fs corresponds to the blinking frequency of the ambient light, the detection data generated by the signal processing unit 20 according to the sampling frequency fs theoretically does not have a chopping (Ripple), that is, the sampling frequency fs is synchronized with the ambient light. When the flicker frequency is detected, the detected data does not generate chopping (as shown in Figure 2A) or does not generate a lot of chopping. Conversely, when the sampling frequency fs does not correspond to the flickering frequency of the ambient light, the signal processing unit 20 The detection data generated based on the sampling frequency must contain a large number of chopping waves (as shown in Figure B). In this way, the present invention knows whether the sampling frequency fs of the signal processing unit 20 corresponds to the flicker frequency of the ambient light, and knows the flicker frequency of the ambient light, thereby further eliminating the flicker phenomenon.

In addition, the signal processing unit 20 of the present invention includes an analog-to-digital converter (ADC). The analog digital conversion unit 22 can sample the detection signal according to the sampling frequency fs to generate the detection data, that is, convert the detection signal to generate the detection data, and learn the flicker frequency of the ambient light according to the detection data, thereby eliminating the flicker phenomenon. .

Please refer to the third figure, which is a block diagram of another preferred embodiment of the present invention. As shown in the figure, the embodiment is different from the embodiment of the first embodiment in that the light source flicker detecting circuit 1 of the embodiment further includes a control unit 30. The control unit 30 is coupled to the signal processing unit 20, and controls the sampling frequency fs of the signal processing unit 20 according to the detection data, so that the sampling frequency fs corresponds to the blinking frequency of the ambient light, that is, the control unit 30 can learn by detecting the detected data. Whether the sampling frequency fs corresponds to the flicker frequency of the ambient light, if the sampling frequency fs does not correspond to the flicker frequency of the ambient light, the sampling frequency fs can be controlled such that the sampling frequency fs corresponds to the flicker frequency of the ambient light to confirm the ambient light The frequency of flashing.

In addition, the control unit 30 generates a control signal according to the blinking frequency of the ambient light, and transmits a control signal to the electronic device to control the electronic device to eliminate the flicker phenomenon. In the embodiment, the electronic device is an image capturing unit 40, and the control unit 30 transmits a control signal to the image capturing unit 40 to control one of the image capturing units 40 to capture the frequency corresponding to the ambient light. In this way, the control unit 30 controls the frequency of the capture of the image capturing unit 40 to correspond to the blinking frequency of the ambient light, so that the image generated by the image capturing unit 40 does not flicker.

In other words, after the sampling frequency fs corresponds to the blinking frequency, the control unit 30 generates a control signal and transmits a control signal to the image capturing unit 40 to control the capturing frequency of the image capturing unit 40, that is, the sampling frequency fs corresponds to the ambient light. The sampling frequency of the signal processing unit 20 is similar to the blinking frequency of the ambient light, and the sampling frequency fs also corresponds to the capturing frequency. Thus, the present invention can control the image capturing unit 40 to be captured by the control unit. The frequency corresponds to the flicker frequency of the ambient light, and the phenomenon of eliminating flicker is achieved.

As described above, the present invention determines whether the sampling frequency fs corresponds to one of the flicker frequencies of the ambient light. The control unit 30 of the present invention is configured to count a chopping of the detected data output by the signal processing unit 20 ( The number of Ripples is used to determine whether the sampling frequency fs of the analog-to-digital conversion unit 22 of the signal processing unit 20 corresponds to the flicker frequency of the ambient light. When the number of chopping waves is greater than a threshold value, the control unit 30 switches the signal processing. When the sampling frequency fs of the analog-to-digital conversion unit 22 of the unit 20, that is, the number of chopping waves is greater than the threshold value, it indicates that the sampling frequency fs does not correspond to the flicker frequency, and the control unit 30 needs to switch the sampling frequency fs of the analog-digital conversion unit 22 to Another new sampling frequency fs is used to re-convert the detection signal generated by the light detecting unit 10 to detect ambient light to generate new detection data, so as to determine whether the sampling frequency fs corresponds to Flashing frequency.

For example, when the blinking frequency of the ambient light source is 60 Hz, and the sampling frequency fs of the analog converting unit 22 of the signal processing unit 20 is 50 Hz, the analog digital converting unit 22 samples the detecting signal generated by the light detecting unit 10. The detection unit 30 generates the number of chopping waves of the detected data. Since the sampling frequency fs is 50 Hz and does not correspond to the ambient light flicker frequency of 60 Hz, the number of chopping waves must be greater than the threshold. In this case, the control unit 30 switches the sampling frequency fs of the analog digital conversion unit 22 to 60 Hz, and re-converts the detection signal generated by the light detecting unit 10 to detect ambient light to generate new detection data to re Counting the number of chopping waves of the new detected data. At this time, since the sampling frequency fs is 60 Hz corresponding to the blinking frequency of ambient light 60 Hz, the number of chopping waves is less than the threshold value, and then the control unit 30 generates a control signal. And the image capturing unit 40 is controlled to control the capturing frequency of the image capturing unit 40 to correspond to the blinking frequency, thereby achieving the phenomenon of eliminating flicker.

Please refer to the fourth figure, which is a block diagram of another preferred embodiment of the present invention. As shown in the figure, the embodiment of the present embodiment is different from the embodiment of the third embodiment in that the light source flicker detecting circuit 1 of the present embodiment further includes a counting unit 24. The counting unit 24 is coupled to the analog digital converting unit 22 of the signal processing unit 20, and counts the number of chopping waves of the detected data to generate a counting result, and transmits the counting result to the control unit 30, and the control unit 30 determines When the number of chopping waves is greater than the threshold value, the sampling frequency of the analog-to-digital conversion unit 22 is switched, and the rest of the processing manner is the same as that described in the previous embodiment, and therefore will not be described in detail herein.

Please refer to FIG. 5 and FIG. 6 together, which are respectively a table and a waveform diagram of the detection data according to a preferred embodiment of the present invention. As shown in the figure, this embodiment illustrates how the control unit 30 or the counting unit 24 counts the number of chopping waves of the detected data to determine whether the sampling frequency fs corresponds to the flicker frequency, so as to know the flicker frequency of the ambient light. In order to achieve the purpose of eliminating flicker. First, as shown in FIG. 5, the detection data generated by the signal processing unit 20 includes a plurality of detection values, which are 431, 439, 436, 424, 417, 438, 440, 432, and 412, respectively. 431, 438, 436, 424, 420, 438, and 440. The detected value is drawn into the waveform of the sixth figure. Since the chopping of the embodiment is defined as three detected values, the first detected value and the second detected value rise linearly, and the first The two detection values until the third detection value is linearly decreased, or the first detection value and the second detection value are linearly decreased, and the second detection value to the third detection value is When the line rises linearly, and the difference between the second detected value and the third detected value is greater than a reference value, it can be regarded as chopping, and the first three detection values of the present embodiment are the first The detection value is 431, the second detection value is 439, the third detection value is 417, and the reference value is set to 20, and the first detection value to the second detection value is raised from 431 to 439, and the second detected value to the third detected value is decreased from 439 to 417, and the difference between the second detected value and the third detected value is 22, that is, the difference is 22 is greater than The reference value is 20, and it can be determined that there is a chopping of the first three detected values. Similarly, there are 5 chops in the detected values of the waveform in the sixth graph.

Then, the implementation may set a threshold to determine whether the sampling frequency fs corresponds to the blinking frequency of the ambient light according to the detected data, so as to know the blinking frequency of the ambient light. In this embodiment, when the threshold is set to 3, the detection is performed. The measured data contains 5 chops larger than the threshold value, and it can be judged that the sampling frequency fs corresponds to the flicker frequency of the ambient light, and the flicker frequency of the ambient light is known. When the threshold value is set to 6, the detection data contains less than the threshold value, and it can be determined that the sampling frequency fs does not correspond to the blinking frequency of the ambient light, and the different sampling frequency fs must be switched again, and then the new sampling is determined. Whether the frequency fs corresponds to the flicker frequency.

The invention determines whether the sampling frequency fs corresponds to the flicker frequency of the ambient light. In addition to the above method of comparing the number of chopping and the threshold value, there are other ways of judging, which will be exemplified below. The signal processing unit 20 of the present invention generates a first detection data and a second detection data according to a detection signal generated by the first sampling frequency and the second sampling frequency conversion light detecting unit 10 detecting the ambient light. And determining, according to the first detection data and the second detection data, that the first sampling frequency or the second sampling frequency corresponds to a blinking frequency of the ambient light.

Please refer to FIG. 7A and FIG. 7B respectively, which are waveform diagrams of detection data generated according to the first sampling frequency and the second sampling frequency, respectively, according to a preferred embodiment of the present invention. In this embodiment, the signal processing unit 20 generates the first detection data and the second detection data according to the first sampling frequency and the second sampling frequency. The first sampling frequency corresponds to a first reference blinking frequency, and the second sampling frequency corresponds to a second reference blinking frequency. When the first sampling frequency corresponds to the flicker frequency of the ambient light, the first reference flicker frequency is confirmed as the flicker frequency of the ambient light; similarly, when the second sampling frequency corresponds to the flicker frequency of the ambient light, the second reference flicker frequency is confirmed The flashing frequency of ambient light. In this embodiment, the signal processing unit 20 generates the first detection data and the second detection data according to the first sampling frequency and the second sampling frequency to form a first waveform 50 and a second waveform 60.

As described above, there are four ways in which the judgment sampling frequency fs of the present invention corresponds to the flicker frequency. First, the present invention determines the number of chopping waves of the first detected data and the second detected data. The number of chopping waves of the first detecting data is a first chopping number; the number of chopping waves of the second detecting data is a second chopping number. The control unit 30 determines, according to the first chopping number and the second chopping number, that the first sampling frequency corresponds to the flicker frequency of the ambient light or the second sampling frequency corresponds to the flicker frequency of the ambient light, thereby determining that the first reference flicker frequency is The ambient light flicker frequency or the second reference flicker frequency is the flicker frequency of the ambient light. That is, whether the number of chopping waves is exceeded in this embodiment It is determined by the threshold value that if the threshold value is set to 5, the number of chopping waves of the second waveform 60 is greater than the threshold value, so the sampling frequency of the second waveform 60 does not correspond to the blinking frequency of the ambient light, and the A reference flicker frequency is a flicker frequency. In this embodiment, the first sampling frequency is 100 Hz, and the first reference flicker frequency corresponding to the first sampling frequency is 100 Hz; the second sampling frequency is 120 Hz, and the second sampling frequency is The corresponding second reference flicker frequency is 120 Hz, that is, the first reference flicker frequency 100 Hz is the flicker frequency of the ambient light. Moreover, the number of chopping waves of the first waveform 50 is less than the threshold value, that is, the control unit 30 controls the sampling frequency of the analog-to-digital conversion unit 22 of the signal processing unit 20 to be set to 100 Hz, and sets the first reference flicker frequency. 100Hz is the flicker frequency to eliminate the flicker.

The second method of determining is that when the number of first chopping waves is greater than a first sum of the number of second chopping waves and an offset value TH _diff , the second reference flicker frequency is a flicker frequency, that is, utilizing When the number of first chopping waves is greater than the number of second chopping waves plus an offset value TH _diff , the second reference flicker frequency is a flicker frequency; when the number of second chopping waves is greater than the first chopping wave When the number and the offset value TH _diff are a second sum value, the first reference flicker frequency is a flicker frequency, that is, when the number of the second chopping waves is greater than the number of the first chopping waves plus the offset value TH _diff Then the first reference flicker frequency is the flicker frequency. The offset value TH _diff is designed to prevent the first waveform 50 from being too similar to the second waveform 60 to resolve the first reference flicker frequency or the second reference flicker frequency as the flicker frequency. For example, when the offset value TH _diff is 3, the number of chopping waves of the first waveform 50 is 0, and the number of chopping waves of the second waveform 60 is 5, because the number of chopping waves of the second waveform 60 is The number of chopping waves 5 is greater than the first waveform 50 is 0 plus the offset value 3. Therefore, the first reference flicker frequency 100 Hz corresponding to the first sampling frequency of the first waveform 50 is set to be the flicker frequency.

The third method of determining is to first use the detected values of the first detected data and the second detected data to determine. The first detection data includes a plurality of first detection values, and the sum of the difference values between the first detection values is a first difference sum value; the second detection data includes a plurality of second detection values, the The sum of the differences between the two detected values is a second difference sum value. Then, when a quotient value of the first difference sum value and a first average value is greater than a first sum value of the second difference sum value and a second average value, and a first sum value of one of the offset values, then The second reference flicker frequency is a flicker frequency; when the first difference sum value and a first average value are smaller than the second difference sum value and a second average value, a first sum of one of the quotient value and an offset value When the value is, the first reference blinking frequency is the blinking frequency. As shown in the fifth figure, the sum of the first detected data differences of the first waveform 50 is | 439-431 |+| 436-439 |+| 424-436 |+| 417-424 |+| 438-417 | +| 440-438 |+| 432-440 |+| 412-432 |+| 431-412 |+| 438-431 |+| 436-438 |+| 424-436 |+| 420-424 |+| 438-420 |+| 440-438 |=8+3+12+7+21+2+8+20+19+7+2+12+4+18+2=145, while the first average is 431 +439+436+424+417+438+440+432+412+431+438+436+424+424+420+438+440/16=431, similarly, the second detection data of the second waveform 60 Difference sum value system | 430-428 |+| 435-430 |+| 436-435 |+| 433-436 |+| 433-433 |+| 434-433 |+| 426-434 |+| 426-426 |+| 429-426 |+| 433-429 |+| 435-433 |+| 434-435 |+| 432-434 |+| 428-432 |+| 425-428 |=2+5+1+ 3+1+8+3+4+2+1+2+4+3+18+2 is 39 and the second average is 431, and the sum of the first detected data differences corresponds to the first average. Referring to the blinking frequency, the second detected data difference sum value corresponds to the second average corresponding to the second reference blinking frequency. If the first reference flicker frequency is 100 Hz, and the second reference flicker frequency is 120 Hz, and the first average value is 431, the second average value is 431, and the offset value TH _diff is 0.2, when the first waveform 50 is the first The sum of the detected data difference value 145 and the first average value 431 is 0.336426914 is greater than the second detected data difference sum value 39 of the second waveform 60 and the second average value 431 has a quotient of 0.090487239 and an offset value of 0.2. The sum value, that is, the sum of the first detected data difference value 145 divided by the first average value 431 is 0.336426914, which is greater than the second detected data difference sum value 39 divided by the second average value 431 quotient value 0.090487239 The sum of the offset values of 0.2 is 0.290487239, so the second reference flicker frequency of 120 Hz is set as the flicker frequency.

The fourth method of determining is to add a difference between the complex choppings of the first detected data to obtain a sum of the first chopping differences, and to add a difference between the complex chopping waves of the second detecting data to obtain a difference. The second chop difference sum value is used to determine whether the first sampling frequency or the second sampling frequency corresponds to the flicker frequency of the ambient light. When the first chop difference sum value is greater than the second chop difference sum value and one of the offset values, the second reference flicker frequency is the flicker frequency of the ambient light; when the second chop difference is summed When the value is greater than the second sum of the first chop difference sum value and the offset value, the first reference flicker frequency is the flicker frequency of the ambient light.

In summary, the light source blink detection circuit and method of the present invention uses a light detecting unit to detect an ambient light to generate a detection signal, and then uses a signal processing unit to convert the detection signal according to at least one sampling frequency. And generating at least one detection data, and determining, according to the detection data, whether the flicker frequency corresponds to the sampling frequency, so as to know the flicker frequency of one of the ambient lights. Thus, the present invention knows the flicker frequency of the ambient light by determining whether the sampling frequency of the signal processing unit corresponds to the flicker frequency of the ambient light.

The invention is a novelty, progressive and available for industrial use, and should meet the requirements of the patent application stipulated in the Patent Law of China, and the invention patent application is filed according to law, and the prayer bureau will grant the patent as soon as possible. prayer.

However, the above description is only a preferred embodiment of the present invention, and is not intended to be used. The scope of the present invention is defined by the scope of the invention, and the equivalents and modifications of the shapes, structures, features and spirits of the present invention are intended to be included in the scope of the present invention.

10‧‧‧Light detection unit

20‧‧‧Signal Processing Unit

22‧‧‧ analog digital conversion unit

Claims (12)

A light source flicker detecting circuit includes: a light detecting unit for detecting an ambient light to generate a detecting signal; a signal processing unit coupled to the light detecting unit and converting according to at least one sampling frequency The detection signal generates at least one detection data; and a control unit is coupled to the signal processing unit, and counts a number of Ripples of the detected data to determine whether the sampling frequency corresponds to the One of the ambient light blinking frequencies. When the number of the chopping waves is greater than a threshold value, the control unit switches the sampling frequency of the signal processing unit so that the sampling frequency corresponds to the blinking frequency, and the blinking of the ambient light is known. The detection data includes a plurality of detection values. When one of the detection values is greater than or equal to two detection values before and after, the three detection values are determined to be the chopping . The light source flicker detecting circuit of claim 1, wherein the control unit determines whether the sampling frequency is synchronized with the flicker frequency according to the number of the chopping of the detected data to confirm the flicker frequency. The light source flicker detecting circuit of claim 1, wherein the sampling unit generates a control signal and transmits the control signal to an image capturing unit to control the sampling frequency. One of the image capturing units captures the frequency corresponding to the blinking frequency. The light source flicker detecting circuit of claim 1, further comprising: a counting unit coupled to the signal processing unit and counting the chopping of the detecting data a counting result is generated, and the counting result is transmitted to the control unit, and the control unit switches the sampling frequency of the signal processing unit when the number of the chopping waves is greater than the threshold according to the counting result So that the sampling frequency corresponds to the blinking frequency. The light source flicker detecting circuit of claim 1, wherein the signal processing unit comprises an analog digital conversion unit. A light source flicker detection method includes: detecting an ambient light to generate a detection signal; converting the detection signal according to at least one sampling frequency to generate at least one detection data, and determining the sampling according to the detection data Whether the frequency corresponds to one of the ambient light blinking frequencies, and the blinking frequency of the ambient light is known; and counting the number of Ripples of the detected data to determine whether the sampling frequency corresponds to the environment One of the light flickering frequencies, when the number of the chopping waves is greater than a threshold value, the sampling frequency is switched such that the sampling frequency corresponds to the flicker frequency, and the flicker frequency of the ambient light is known; wherein the detection data includes The plurality of detection values are determined to be the chopping waves when one of the detection values is greater than or equal to both of the detection values. The light source flicker detecting method of claim 6, wherein the at least one sampling frequency comprises a first sampling frequency and a second sampling frequency, and the detection data comprises a first detection data and a second Detecting data, the first sampling frequency corresponding to a first reference blinking frequency, the second sampling frequency corresponding to a second reference blinking frequency, respectively generating the first detecting data according to the first sampling frequency and the second sampling frequency And the second detection data. The method for detecting a light source flicker as described in claim 7 of the patent application, wherein the Detecting Measuring a number of Ripples of the data to determine whether the sampling frequency corresponds to one of the ambient light blinking frequencies, and when the number of the chopping waves is greater than a threshold value, switching the sampling frequency to make the sampling frequency Corresponding to the blinking frequency, and in the step of learning the blinking frequency of the ambient light, counting the number of the chopping waves of the first detecting data to determine whether the first sampling frequency corresponds to the ambient light a blinking frequency, if the first sampling frequency corresponds to the blinking frequency of the ambient light, the first reference blinking frequency is known to be the blinking frequency of the ambient light. The light source flicker detecting method according to claim 7, wherein the step of determining whether the sampling frequency corresponds to one of the ambient light flicker frequencies according to the detected data, and determining the blinking frequency of the ambient light The number of the chopping waves of the first detection data and the second detection data is respectively counted, and the number of the first chopping wave and the second chopping wave number are obtained, and according to the first The number of waves and the second number of choppings determine that the first reference flicker frequency or the second reference flicker frequency is the flicker frequency of the ambient light. The light source flicker detecting method according to claim 9, wherein when the first chopping number is greater than the first sum of the second chopping number and an offset value, the second The reference flicker frequency is the flicker frequency of the ambient light; when the second chopping number is greater than the second sum of the first chopping number and the offset value, the first reference flicker frequency is the The flashing frequency of ambient light. The light source flicker detection method of claim 7, wherein the first detection data includes a plurality of first detection values, and the sum of the difference values between the first detection values is a first difference. a sum of values, the second detection data includes a plurality of second detection values, and a sum of the difference values between the second detection values is a second difference sum value, when the first difference sum value is a first When the quotient value of the average value is greater than a quotient value of the second difference sum value and a second average value and a first sum value of one of the offset values, then the second reference The blinking frequency is the blinking frequency of the ambient light; when the quotient value of the second difference sum value and the second average value is greater than the first difference sum value and the quotient value of the first average value and the offset value In a second sum value, the first reference flicker frequency is the blinking frequency of the ambient light. The light source flicker detecting method of claim 7, wherein counting the number of Ripples of the detected data to determine whether the sampling frequency corresponds to one of the ambient light blinking frequencies, When the number of the chopping waves is greater than a threshold value, the sampling frequency is switched such that the sampling frequency corresponds to the blinking frequency, and in the step of learning the blinking frequency of the ambient light, the first detecting data is added Knowing the difference between the complex chopping waves and the sum of the first chopping differences, and summing the difference between the complex chopping waves of the second detecting data to obtain a sum of the second chopping differences, when the first chopping wave When the difference sum value is greater than the second sum of the second chop difference and the first sum of the offset values, the second reference flicker frequency is the flicker frequency of the ambient light; when the second chop difference is summed When the value is greater than the second sum of the first chop difference and the second sum of the offset values, the first reference flicker frequency is the blinking frequency of the ambient light.