TW202347806A - Optical sensing apparatus and sensing method thereof - Google Patents

Abstract

An optical sensing apparatus and sensing method thereof are provided. A breakdown bias voltage is provided to a photo-sense diode. A count value is generated by counting breakdown times of a photo-sensing diode according to a photo-sensing signal generated by sensing ambient light by the photo-sensing diode. Sampling values are generated by sampling the count value. Determining light characteristics of the ambient light according to the Sampling values.

Description

Optical sensing device and sensing method thereof

The present invention relates to a sensing device, and in particular, to an optical sensing device and a sensing method thereof.

Integrated chips (ICs) with photonic devices exist in many modern electronic devices. For example, photonic devices including image sensors are used in cameras, video recorders, and other types of photography systems to capture images. Generally speaking, light sensing chips often use photocurrent integration to convert the current into voltage, and then use an analog-to-digital converter for decoding. Analog-to-digital converters have the disadvantages of complex design and power consumption. In the case of weak ambient light, high-precision analog-to-digital conversion circuits are required for noise control or to increase the number of light sensing diodes to improve sensing sensitivity. , however, this will increase the circuit area and increase the cost. In addition, using photocurrent integration for signal processing requires sufficient integration time to prevent the signal-to-noise ratio from being too low, which will significantly limit the data report rate.

The present invention provides an optical sensing device and a sensing method thereof. In the case of weak ambient light, the optical characteristics of the ambient light can be accurately judged without increasing the circuit area, cost and power consumption, and provide good sensing. Compared with traditional light sensing diodes, it can achieve the same sensing sensitivity in a smaller circuit area.

The optical sensing device of the present invention includes a bias voltage generating circuit, at least one light sensing diode, a quenching circuit, a counter circuit and a signal processing circuit. The bias voltage generating circuit provides a collapse bias voltage or a standard bias voltage. The cathode terminal of the light sensing diode is coupled to the bias voltage generating circuit, and senses ambient light to generate a light sensing signal. The quenching circuit is coupled to the anode terminal of the light sensing diode to quench the light sensing diode. The counter circuit is coupled to the anode terminal of the light sensing diode, and counts the number of collapses of the light sensing diode according to the light sensing signal generated by the light sensing diode during receiving the breakdown bias voltage to generate a count value. The signal processing circuit is coupled to the counter circuit, samples the count value to generate a plurality of sample values, and determines the optical characteristics of the ambient light based on the sample values.

The invention also provides a sensing method of an optical sensing device, which includes the following steps. A collapse bias voltage is provided to at least one light sensing diode. According to the light sensing signal generated by the light sensing diode sensing the ambient light, the number of collapses of the light sensing diode is counted to generate a count value. Sampling the count value produces multiple sample values. Determine the light characteristics of the ambient light based on the sampled values.

Based on the above, the light sensing diode according to the embodiment of the present invention can receive the collapse bias voltage and sense the ambient light to generate a light sensing signal. The counter circuit can count the number of collapses of the light sensing diode based on the light sensing signal. To generate a count value, the signal processing circuit can sample the count value to generate multiple sample values, and determine the light characteristics of the ambient light based on the multiple sample values. In this way, the light sensing diode in an extremely reverse biased state is used to sense ambient light, and the counting value of the counter circuit is used to calculate the light intensity sensed by the light sensing diode, thereby avoiding the use of an integrator circuit. Under the condition of weak ambient light, it can accurately judge the optical characteristics of ambient light without increasing circuit area, cost and power consumption, providing good sensing quality and data return rate, and compared with traditional Light sensing diodes can achieve the same sensing sensitivity in a smaller circuit area.

In order to make the content of the present invention easier to understand, the following embodiments are given as examples according to which the present invention can be implemented. In addition, wherever possible, elements/components/steps with the same reference numbers in the drawings and embodiments represent the same or similar parts.

Please refer to FIG. 1 below. FIG. 1 is a schematic diagram of an optical sensing device according to an embodiment of the present invention. The optical sensing device may include a bias voltage generating circuit 102, a light sensing diode PD1 (eg, a Single Photon Avalanche Diode, SPAD), a quenching circuit 104, a counter circuit 106, and a signal In the processing circuit 108, the bias voltage generating circuit 102 is coupled to the cathode terminal of the light sensing diode PD1, and the quenching circuit 104 is coupled to the anode terminal of the light sensing diode PD1. The bias voltage generating circuit 102 can be used to provide a collapse bias voltage or a standard bias voltage to the light sensing diode PD1, so that the light sensing diode PD1 enters an extreme reverse bias or reverse bias state. When the photo-sensing diode PD1 is in an extremely reverse-biased state, when the photons of the ambient light L1 are injected into the depletion layer of the photo-sensing diode PD1, the photo-sensing diode PD1 can be triggered to generate an avalanche current. , and provide the light sensing signal S1. In addition, the quenching circuit 104 can quench the light sensing diode PD1 after the light sensing diode PD1 provides the light sensing signal S1, so as to restore the anode terminal voltage of the light sensing diode PD1 to provide light sensing. The invention does not limit whether the quenching circuit 104 is active or passive based on the voltage before the signal S1 is measured. It is worth noting that although only one light sensing unit formed by the light sensing diode PD1 and the quenching circuit 104 is shown in the embodiment of FIG. 1, it is not limited to this. In other embodiments, optical The sensing device may include more light sensing units, such as a light sensing unit array formed by a plurality of light sensing units and a counter circuit 106 .

The counter circuit 106 can count the number of collapses of the light sensing diode PD1 according to the light sensing signal S1 generated by the light sensing diode PD1 during receiving the collapse bias voltage and generate the count value C1 to the signal processing circuit 108. The signal processing The circuit 108 can determine the light intensity sensed by the light sensing diode PD1 according to the count value C1. For example, as shown in FIG. 2 , the signal processing circuit 108 can count the number of pulses of the light sensing signal S1 during the light sensing period T1 according to the counter circuit 106 (that is, the number of pulses of the light sensing diode PD1 during the light sensing period T1 The count value C1 obtained by the number of collapses) is used to determine the light intensity sensed by the light sensing diode PD1 during the light sensing period T1. The larger the count value C1 is, the greater the count value C1 is, which means that the light sensing diode PD1 is in the light sensing period. The stronger the light intensity sensed during T1. The light sensing period T1 can be, for example, the period during which the light sensing diode PD1 receives the collapse bias voltage. However, it is not limited to this. It can also be set to other periods according to the user's needs, such as the light sensing diode PD1 A period during which the ambient light L1 is received or a period during which the counter circuit 106 performs counting. For example, in some embodiments, the counter circuit 106 can periodically re-count the number of pulses of the light sensing signal S1, for example, re-count the number of pulses of the light sensing signal S1 every light sensing period T1, so that in In the case where the intensity change of the ambient light L1 has a specific frequency, the change in the count value generated by the counter circuit 106 will also have a specific frequency as shown in FIG. 3 .

As shown in FIG. 3 , the signal processing circuit 108 may sample the count value generated by the counter circuit 106 to generate multiple sample values, for example, generate multiple sample values based on the count value generated by the sampling counter circuit 106 at a preset sampling frequency. It is worth noting that the sampling frequency of the signal processing circuit 108 is not limited to FIG. 3 . The signal processing circuit 108 can also sample the count value at a higher or lower preset sampling frequency. The sampling time can be, for example, the sampling frequency. 2 ^N times the reciprocal, where N is a positive integer, but it is not limited to this. The signal processing circuit 108 can determine the light characteristics of the ambient light L1 based on the sampled values. The signal processing circuit 108 can determine the frequency of the ambient light L1 based on the change in amplitude of the sampled value over time. In some embodiments, the signal processing circuit 108 may also perform spectrum analysis on the sampled values, such as fast Fourier transform (FFT) on the sampled values, to obtain the harmonic distribution of the light sensing signal S1. In addition, the signal processing circuit 108 can also determine whether there is a flicker phenomenon based on the amplitude of the harmonic in the frequency domain. For example, when the harmonic amplitude of a certain frequency in the frequency domain is higher than a preset threshold, it means that the ambient light L1 flickers at this frequency. , for example, when the harmonic amplitude at a frequency of 100 Hz in the frequency domain is higher than a preset threshold, it represents that the flicker frequency of the ambient light L1 is 100 Hz. In some embodiments, the signal processing circuit 108 may also first calculate the average value of the sampled values, and then subtract the average value from the sampled values to remove the DC component of the sampled values, and then perform a fast Fourier transform on the sampled values with the DC component removed. .

In this way, by biasing the light sensing diode PD1 to an extremely reverse biased state, and using a counter circuit to count the number of collapses of the light sensing diode to generate a count value to determine the optical characteristics of the ambient light, the optical sensitivity can be improved. The detection device's resistance to noise can still accurately determine the light characteristics of ambient light under weak ambient light conditions, so that the light sensing device has good sensing quality and data reporting rate. In addition, there is no need to set up an integral converters and analog-to-digital converters, which can further reduce the circuit area, reduce power consumption and reduce production costs. Compared with traditional light sensing diodes, the same sensing sensitivity can be achieved in a smaller circuit area.

In addition, in some embodiments, the signal processing circuit 108 can also compensate the count value according to the error compensation value and correct the count value provided by the counter circuit 106, where the error compensation value can, for example, include the value corresponding to the light sensing diode PD1. At least one of a count value of dark current or a count value corresponding to crosstalk interference between adjacent light sensing diodes. The signal processing circuit 108 may, for example, subtract the error compensation value from the count value C1 to more accurately obtain the count value corresponding to the ambient light L1, thereby further improving the sensing quality of the optical sensing device.

FIG. 4 is a schematic diagram of an optical sensing device according to another embodiment of the present invention. In this embodiment, the optical sensing device may further include a filter layer F1. The filter layer F1 may be, for example, a color filter, such as a green, red or blue color filter, but is not limited thereto. The filter layer F1 can band-pass filter the ambient light L1, so that the count value provided by the counter circuit 106 represents the optical characteristics of the ambient light L1 within the bandwidth range of the corresponding color filter. For example, the light intensity and flicker frequency of the ambient light L1 within the bandwidth range of the color filter are not limited to this. The signal processing circuit 108 can generate a corresponding sampling value based on the count value generated by the preset sampling frequency sampling counter circuit 106, and determine that the ambient light L1 is within the bandwidth range of the filter layer F1 based on the sampling value of the light sensing diode PD1. of light intensity. For example, when the filter layer F1 is a red filter, the signal processing circuit 108 can determine the light intensity of the ambient light L1 in the red light wavelength range based on the sampled value.

It is worth noting that in other embodiments, the optical sensing device may also include multiple different filter layers. As shown in FIG. 5 , the optical sensing device may include multiple filter layers F1 to F3. The filter layers F1 to F3 may, for example, have different bandwidth ranges, for example, implemented with green, red, and blue color filters respectively, but are not limited thereto. The filter layers F1 to F3 correspond to different light sensing unit arrays AR1 to AR3, and can respectively perform bandpass filtering on the ambient light L1 that illuminates the light sensing unit arrays AR1 to AR3. The light sensing diodes PD1 of the light sensing unit arrays AR1 ~ AR3 can respectively receive the ambient light L1 through the corresponding filter layers F1 ~ F3, and the counter circuits 106 of the light sensing unit arrays AR1 ~ AR3 can respectively count the coupled The number of collapses of the connected light sensing diode PD1 is generated to generate a corresponding count value.

The signal processing circuit 108 may sample the count values of the photo-sensing diodes PD1 of each of the photo-sensing unit arrays AR1 - AR3 according to a preset sampling frequency to generate corresponding sampling values. Since different sensing unit arrays AR1 ~ AR3 correspond to different filter layers F1 ~ F3, the count values generated by the counter circuits 106 of different sensing unit arrays AR1 ~ AR3 can represent the light of the ambient light L1 in different bandwidth ranges. Therefore, the signal processing circuit 108 can determine the color temperature of the ambient light L1 based on the sampled value obtained by the sampling count value, and further determine the light source type and illumination of the ambient light L1, such as LED, incandescent lamp, sunlight, etc. For example, assuming that the filter layers F1 to F3 are green, red, and blue color filters respectively, the signal processing circuit 108 can determine whether the ambient light L1 is in the green light wavelength range, the red light wavelength range, and the blue light based on the sampled values. The light intensity in the wavelength range can be used to know the wavelength distribution of the ambient light L1, and then determine the color temperature, light source type and illumination of the ambient light L1. In some embodiments, the corresponding error compensation values can also be subtracted from the count values corresponding to the sensing unit arrays AR1 ~ AR3 , for example, the count values of the dark current corresponding to the sensing unit arrays AR1 ~ AR3 are subtracted respectively. The count value of the crosstalk interference is used to more accurately obtain the count value corresponding to the ambient light L1, thereby further improving the sensing quality of the optical sensing device.

It is worth noting that in some embodiments, the filter layers F1 ~ F3 may only cover part of the sensing unit arrays AR1 ~ AR3, and allow part of the light sensing diodes PD1 in the sensing unit arrays AR1 ~ AR3 to pass The filter light layers F1~F3 receive ambient light L1, and part of the light sensing diodes PD1 directly receive the ambient light L1. For example, the sensing unit arrays AR1~AR3 respectively have part of the light sensing diodes PD1 directly receiving the ambient light L1. , but is not limited to this, for example, one of the sensing unit arrays AR1 ~ AR3 may have a part of the light sensing diode PD1 to directly receive the ambient light L1. In this way, the signal processing circuit 108 can determine the light intensity of the ambient light L1 in the bandwidth range of the filter layers F1 to F3 based on the sampled values obtained from the sampling count value, and determine the light intensity of the ambient light L1 in the bandwidth range of the filter layers F1 to F3 based on the sampled values. The color temperature can be determined by the light intensity in the device. In addition, the light intensity of the ambient light L1 can also be determined based on the count value of the light sensing diode PD1 corresponding to the direct reception of the ambient light L1.

FIG. 6 is a schematic diagram of an optical sensing device according to another embodiment of the present invention. In this embodiment, the optical sensing device may further include a switch SW1, a switching circuit 602 and a readout circuit 604. The switch SW1 is coupled between the anode terminal of the photo sensing diode PD1 and the quenching circuit 104. The circuit 602 is coupled between the anode terminal of the light sensing diode PD1, the counter circuit 106 and the readout circuit 604. The readout circuit 604 is also coupled to the signal processing circuit 108. The readout circuit 604 can be implemented by, for example, switches SW2 and SW3. The switch SW2 is coupled between the anode terminal of the photo-sensing diode PD1 and the counter circuit 106. The switch SW3 is coupled to the anode terminal of the photo-sensing diode PD1. between the anode terminal and the readout circuit 604.

The signal processing circuit 108 can control the conduction state of the switches SW1 to SW3 according to the sensing mode of the optical sensing device. For example, when the optical sensing device is in a weak ambient light sensing mode, the control bias voltage generating circuit 102 provides a collapse bias voltage to the light sensing diode PD1, controls the switch SW1 to be turned on, and controls the switching circuit 502 to switch the light sensing diode PD1 on. The anode end of the pole body PD is switched and connected to the counter circuit 106 (that is, the switch SW2 is controlled to be turned on and the switch SW3 is turned off), so that the optical sensing device can accurately determine the optical characteristics of the ambient light L1 in a low-light environment. , while maintaining good sensing quality. When the optical sensing device is in the general sensing mode, the signal processing circuit 108 can control the bias voltage generating circuit 102 to provide a standard bias voltage, control the switch SW1 to turn off and control the switching circuit 502 to turn off the light sensing diode PD1. The anode end is switched and connected to the readout circuit 504 (that is, the switch SW2 is controlled to be off and the switch SW3 is controlled to be on), so that the optical sensing device is suitable for sensing the ambient light L1 in a higher illumination environment.

The standard bias voltage is smaller than the collapse bias voltage. The standard bias voltage can make the light sensing diode PD1 enter the reverse bias state but does not reach the extreme reverse bias state. That is to say, the light sensing diode PD1 is at this time Does not have the characteristics of a single photon avalanche diode. The readout circuit 504 may, for example, include an integrator and an analog-to-digital converter. The integrator may integrate the light sensing signal provided by the light sensing diode PD1 to generate an integrated signal. The analog-to-digital converter may convert the integrated signal into The digital signal is generated to generate the sensing value SD1 to the signal processing circuit 108 . In this way, switching the light sensing diode PD1 to the counter circuit 106 or the readout circuit 504 under different lighting environments can expand the light intensity applicable range of the optical sensing device for light sensing, and improve the performance of the optical sensing device. Ease of use.

FIG. 7 is a flow chart of a sensing method of an optical sensing device according to an embodiment of the present invention. As can be seen from the above embodiments, the sensing method of the optical sensing device may include at least the following steps. First, a collapse bias voltage is provided to the light sensing diode (step S702). Next, the number of collapses of the light sensing diode is counted according to the light sensing signal generated by the light sensing diode sensing ambient light to generate a count value (step S704). Then, the count value is sampled to generate multiple sample values (step S706). For example, the count value may be sampled according to a preset sampling frequency to generate multiple sample values. After that, the optical characteristics of the ambient light are determined based on the sampled values (step S708). For example, spectrum analysis can be performed on the sampled values to obtain the harmonic distribution of the light sensing signal, or whether the vibration of any harmonic is greater than a predetermined value. Set a threshold to determine whether flickering of a specific frequency occurs.

FIG. 8 is a flow chart of a sensing method of an optical sensing device according to another embodiment of the present invention. In this embodiment, the optical sensing device may include at least one filter layer. The filter layer may band-pass filter the ambient light. The light sensing diode receives the ambient light through the corresponding filter layer. The filter layer may For example, color filters. After step S702, the number of collapses of the light-sensing diode can be counted according to the light-sensing signal generated by the light-sensing diode sensing ambient light through the filter layer (step S802). In some embodiments, different light sensing diodes can also receive ambient light through filter layers with different frequency bands, or some of the light sensing diodes receive ambient light through the filter layer, and some The light-sensing diode receives ambient light directly. In addition, in this embodiment, the count value can also be compensated based on the error compensation value (step S804), for example, the count value is compensated by subtracting the error compensation value from the count value. The error compensation value may include, for example, at least one of the count value corresponding to the dark current of the light sensing diode or the count value corresponding to the crosstalk interference between adjacent light sensing diodes, but is not limited to this. By compensating the count value with the error compensation value, the count value corresponding to the ambient light L1 can be obtained more accurately, thereby improving the sensing quality of the optical sensing device.

In step S708, since the light sensing diode of this embodiment receives ambient light through the filter layer, the optical characteristics of the ambient light within the bandwidth range can be determined based on the sampled values. For example, the light intensity of the ambient light and the flicker frequency within the bandwidth range of the color filter, but are not limited to this. In the case where different light sensing diodes receive ambient light through filter layers with different frequency bands, the light intensity of the ambient light within the bandwidth range of each filter layer can also be determined based on the sampled values obtained from the sampling count values. , and determine the color temperature of the ambient light based on the light intensity of the ambient light within the bandwidth range of each filter layer, and further determine the type and illumination of the light source that provides the ambient light. In addition, in the case where some of the light sensing diodes receive ambient light through the filter layer and some of the light sensing diodes directly receive the ambient light, in addition to the corresponding light sensing that receives the ambient light through the filter layer The sampling value of the diode determines the light intensity of the ambient light within the bandwidth range of each filter layer, and determines the color temperature of the ambient light based on the light intensity of the ambient light within the bandwidth range of each filter layer. It can also be used directly based on the corresponding The light intensity of the ambient light is determined by the sampled value of the light sensing diode that receives the ambient light.

In summary, the light sensing diode according to the embodiment of the present invention can receive the collapse bias voltage and sense the ambient light to generate a light sensing signal, and the counter circuit can count the number of times of the light sensing diode based on the light sensing signal. The count value is generated by collapsing the number of times. The signal processing circuit can sample the count value to generate multiple sampling values, and determine the light characteristics of the ambient light based on the multiple sampling values. In this way, the light sensing diode in an extremely reverse biased state is used to sense ambient light, and the counting value of the counter circuit is used to calculate the light intensity sensed by the light sensing diode, thereby avoiding the use of an integrator circuit. Under the condition of weak ambient light, it can accurately judge the optical characteristics of ambient light without increasing circuit area, cost and power consumption, providing good sensing quality and data return rate, and compared with traditional Light sensing diodes can achieve the same sensing sensitivity in a smaller circuit area.

Although the present invention has been disclosed above through embodiments, they are not intended to limit the present invention. Anyone with ordinary knowledge in the technical field may make some modifications and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the appended patent application scope.

102: Bias voltage generation circuit 104:Quenching circuit 106: Counter circuit 108:Signal processing circuit 602: switching circuit 604: Readout circuit L1: ambient light PD1: light sensing diode S1: Light sensing signal C1: count value T1: Light sensing period F1~F3: filter layer SW1~SW3: switch SD1: Sensing value AR1~AR3: light sensing unit array S702~S708, S802~S804: Sensing method steps of optical sensing device

FIG. 1 is a schematic diagram of an optical sensing device according to an embodiment of the present invention. FIG. 2 is a waveform diagram of a light sensing signal according to an embodiment of the present invention. FIG. 3 is a waveform diagram of a count value according to an embodiment of the present invention. FIG. 4 is a schematic diagram of an optical sensing device according to another embodiment of the present invention. FIG. 5 is a schematic diagram of an optical sensing device according to another embodiment of the present invention. FIG. 6 is a schematic diagram of an optical sensing device according to another embodiment of the present invention. FIG. 7 is a flow chart of a sensing method of an optical sensing device according to an embodiment of the present invention. FIG. 8 is a flow chart of a sensing method of an optical sensing device according to another embodiment of the present invention.

102: Bias voltage generation circuit

104:Quenching circuit

106: Counter circuit

108:Signal processing circuit

PD1: light sensing diode

S1: Light sensing signal

C1: count value

L1: ambient light

Claims (23)

An optical sensing device including: a bias voltage generating circuit that provides a collapse bias voltage or a standard bias voltage; At least one light sensing diode, the cathode terminal of which is coupled to the bias voltage generating circuit, senses an ambient light and generates a light sensing signal; A quenching circuit, coupled to the anode terminal of the light sensing diode, quenches the light sensing diode; A counter circuit, coupled to the anode terminal of the light sensing diode, counts the collapse of the light sensing diode based on the light sensing signal generated by the light sensing diode during receiving the collapse bias voltage. times to generate a count value; and A signal processing circuit, coupled to the counter circuit, samples the count value to generate a plurality of sample values, and determines the optical characteristics of the ambient light based on the sample values. The optical sensing device as claimed in claim 1, wherein the signal processing circuit performs spectrum analysis on the sampled values to obtain the harmonic distribution of the light sensing signal. The optical sensing device as claimed in claim 2, wherein the signal processing circuit determines whether a flicker phenomenon occurs based on whether the vibration of a harmonic is greater than a preset threshold. The optical sensing device as described in claim 1, further comprising: At least one filter layer performs band-pass filtering on the ambient light, and the light sensing diode receives the ambient light through the corresponding filter layer. The optical sensing device as described in claim 1, further comprising: A filter layer performs band-pass filtering on the ambient light. The light sensing diode receives the ambient light through the filter layer. The counter circuit counts the number of collapses of the light sensing diode to generate a corresponding count. The signal processing circuit samples the count value of the light sensing diode to generate a plurality of sampling values, and determines that the ambient light is within the bandwidth range of the filter layer based on the sampling values of the light sensing diode. of light intensity. The optical sensing device according to claim 1, which includes a plurality of light sensing diodes and a plurality of filter layers. The filter layers have different frequency bands and band-pass the ambient light. Filtering, the light-sensing diodes respectively receive the ambient light through the corresponding filter layer, the counter circuit counts the number of collapses of each light-sensing diode to generate a corresponding count value, and the signal processing circuit samples each The counting values of the light sensing diodes generate corresponding sampling values, and the light intensity of the ambient light within the bandwidth range of each filter layer is determined based on the sampling values of the light sensing diodes, and the ambient light is determined based on the sampling values of the light sensing diodes. The light intensity within the bandwidth range of each filter layer determines the color temperature of the ambient light. As in the optical sensing device of claim 6, the signal processing circuit determines the light source type of the ambient light based on the color temperature of the ambient light. The optical sensing device according to claim 1, which includes a plurality of light sensing diodes and a plurality of filter layers. The filter layers have different frequency bands and band-pass the ambient light. Filtering, some of the light sensing diodes receive the ambient light through corresponding filter layers, the counter circuit counts the number of collapses of each light sensing diode to generate a corresponding count value, and the signal processing circuit Sampling the count value of each light-sensing diode to generate a corresponding sampling value, and judging the light intensity of the ambient light and the bandwidth range of each filter layer based on the sampling values of the light-sensing diodes. The light intensity of the ambient light is determined based on the light intensity of the ambient light within the bandwidth range of each filter layer. The optical sensing device of claim 1, wherein the signal processing circuit further compensates the count value based on an error compensation value. The optical sensing device of claim 9, wherein the error compensation value includes a count value corresponding to the dark current of the light sensing diode or a count value corresponding to crosstalk interference between adjacent light sensing diodes. At least one of them. The optical sensing device as claimed in claim 1, wherein the signal processing circuit samples the count value according to a preset sampling frequency to generate the sample values. The optical sensing device as described in claim 1, further comprising: a switch coupled between the anode terminal of the light sensing diode and the quenching circuit; a switching circuit coupled between the anode terminal of the light sensing diode and the counter circuit; and A readout circuit, coupled between the switching circuit and the signal processing circuit, performs an integration operation on the optical sensing signal to generate a sensing value for the signal processing circuit, and the signal processing circuit performs an integral operation on the optical sensing signal. When the device is in a weak ambient light sensing mode, the bias voltage generating circuit is controlled to provide the collapse bias voltage to the cathode terminal of the light sensing diode, the switch is controlled to be turned on, and the switching circuit is controlled to sense the light. The anode end of the diode is switched and connected to the counter circuit, and when the optical sensing device is in a normal sensing mode, the bias voltage generating circuit is controlled to provide the standard bias voltage to the cathode of the light sensing diode. extreme, and controls the switch to turn off and controls the switching circuit to switch and connect the anode terminal of the light sensing diode to the readout circuit, wherein the standard bias voltage is smaller than the collapse bias voltage. A sensing method of an optical sensing device, including: providing a collapse bias voltage to at least one light sensing diode; Counting the number of collapses of the light sensing diode based on a light sensing signal generated by the light sensing diode sensing an ambient light to generate a count value; Sampling the count value to generate multiple sample values; and The light characteristics of the ambient light are determined based on the sampled values. The sensing method of the optical sensing device as described in claim 13 includes: Spectrum analysis is performed on these sampled values to obtain the harmonic distribution of the light sensing signal. The sensing method of the optical sensing device as described in claim 14 includes: Determine whether flickering occurs based on whether the harmonic vibration is greater than the preset threshold. The sensing method of the optical sensing device according to claim 13, wherein the optical sensing device further includes at least one filter layer that performs band-pass filtering on the ambient light, and the light sensing diode The ambient light is received through the corresponding filter layer. The sensing method of an optical sensing device as claimed in claim 13, wherein the optical sensing device includes a filter layer that band-pass filters the ambient light, and the light sensing diode passes through the The filter layer receives the ambient light, and the sensing method includes: Count the number of collapses of the light sensing diode to generate a corresponding count value; Sampling the count value of the light sensing diode to generate a plurality of sampling values; and The light intensity of the ambient light within the bandwidth range of the filter layer is determined based on the sample values of the light sensing diode. The sensing method of an optical sensing device as claimed in claim 13, wherein the optical sensing device includes a plurality of light sensing diodes and a plurality of filter layers, and the filter layers have different frequency bands. The ambient light is band-pass filtered, and the light sensing diodes receive the ambient light through corresponding filter layers. The sensing method includes: Count the number of collapses of each light sensing diode respectively to generate corresponding count values; Sampling the count value of each light sensing diode to generate a corresponding sampling value; and Determine the light intensity of the ambient light within the bandwidth range of each filter layer based on the sampled values of the light sensing diodes, and determine the ambient light based on the light intensity of the ambient light within the bandwidth range of each filter layer. color temperature. The sensing method of the optical sensing device as described in claim 18 includes: Determine the type of light source of the ambient light based on the color temperature of the ambient light. The sensing method of the optical sensing device according to claim 13, wherein The optical sensing device includes a plurality of light sensing diodes and a plurality of filter layers. The filter layers have different frequency bands and band-pass filter the ambient light. Some of the light sensing diodes The ambient light is received through corresponding filter layers respectively. The sensing method includes: Count the number of collapses of each light sensing diode respectively to generate corresponding count values; Sampling the count value of each light sensing diode to generate a corresponding sampling value; and Determine the light intensity of the ambient light and the light intensity of the ambient light within the bandwidth range of each filter layer based on the sample values of the light sensing diodes, and determine the ambient light within the bandwidth range of each filter layer based on the ambient light. The light intensity determines the color temperature of the ambient light. The sensing method of the optical sensing device as described in claim 13 includes: The count value is compensated according to an error compensation value. The sensing method of an optical sensing device as claimed in claim 21, wherein the error compensation value includes a count value corresponding to the dark current of the light sensing diode or corresponding to the crosstalk between adjacent light sensing diodes. The interference count value is at least one of them. The sensing method of the optical sensing device as described in claim 13 includes: The sample values are generated by sampling the count value according to a preset sampling frequency.

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