CN215491764U - Optical detection control circuit and optical sensor - Google Patents

Abstract

The utility model discloses an optical detection control circuit and an optical sensor, comprising: the device comprises a power management module, a control register module, a clock generator, a photosensitive image array, an analog-to-digital conversion module, an image processing module and a direction identification module; the control register module, the clock generator, the photosensitive image array, the analog-to-digital conversion module, the image processing module and the direction identification module are respectively and electrically connected with the power management module; the photosensitive image array is respectively and electrically connected with the analog-to-digital conversion module and the clock generator; the clock generator, the analog-to-digital conversion module, the image processing module and the direction identification module are respectively and electrically connected with the control register module; the power management module is electrically connected with the power input end and the ground end, and the control register module is electrically connected with the serial data end, the serial clock end and the signal output end respectively. The utility model has high integration level, can intensively realize the functions of optical movement, direction identification, close-range induction and ambient light detection, and reduces the cost of peripheral circuits.

Description

Optical detection control circuit and optical sensor

Technical Field

The utility model relates to the technical field of sensors, in particular to an optical detection control circuit and an optical sensor.

Background

In the products used in the world today, a Sensor (Sensor) is an indispensable important module, which functions like the sensing organ of the human body to sense the external environment and peripheral changes. The sensor not only can sense the outside environment temperature, humidity, voltage, current, special objects and the like, but also can sense gesture operation and displacement of peripheral objects. Sensors (sensors) are of various kinds, and in recent decades, semiconductors have been developed rapidly, and semiconductor sensors are also continuously replacing traditional sensors, especially in the optical field. For example, the conventional mechanical roller mouse is replaced by an optical mouse, the conventional mechanical remote sensing is replaced by Optical Finger Navigation (OFN), the conventional multiple keys are replaced by direction recognition, the conventional mechanical keys are replaced by short-distance induction, manual judgment operation is replaced by ambient light detection, and the like. However, the optical motion sensor module in the prior art needs to be additionally provided with an LDO or an external capacitor, and the external MCU performs secondary processing to meet the hand feeling or operation mode of a human body; the short-distance sensor module and the ambient light detection module are controlled by a simple light sensing chip and an MCU with a high-precision ADC (analog-to-digital converter); the sensors are processed by a complex scheme through the MCU, related devices are needed for peripheral supplement, so that the sensor module becomes complex, the device cost and the processing cost of the sensor module are increased, uncertainty of operation control is brought to the application environment and assembly of the sensor, and manpower and material resources are wasted. In the application of the multiple sensors, different sensor chips and different MCU processing schemes are sampled, and multiple processing schemes and packaging are needed in order to match with application environments and structures, so that the development cycle and the popularization cycle of product application are greatly increased. If the application product needs to use two or more sensors at the same time, different sensors are needed to be added, and hardware cost and development difficulty are increased. Therefore, the present invention provides an optical detection control circuit and an optical sensor with high integration and capable of implementing multiple application functions, which are problems to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to an optical detection control circuit and an optical sensor, which are provided to overcome the above-mentioned drawbacks of the prior art.

In a first aspect, the utility model discloses an optical detection control circuit, which comprises a power management module, a control register module, a clock generator, a photosensitive image array, an analog-to-digital conversion module, an image processing module and a direction identification module; the control register module, the clock generator, the photosensitive image array, the analog-to-digital conversion module, the image processing module and the direction identification module are respectively and electrically connected with the power management module; the photosensitive image array is respectively and electrically connected with the analog-to-digital conversion module and the clock generator; the clock generator, the analog-to-digital conversion module, the image processing module and the direction identification module are respectively and electrically connected with the control register module; the power management module is electrically connected with the power input end and the ground end, and the control register module is electrically connected with the serial data end, the serial clock end and the signal output end respectively.

Preferably, the optical detection control circuit further comprises an LED constant current driving module; the LED constant current driving module is respectively and electrically connected with the power management module, the clock generator, the control register module and the LED lamp connecting end.

Preferably, the optical detection control circuit further comprises an interface processing module; the interface processing module is respectively and electrically connected with the power management module and the control register module; the serial data end and the serial clock end are both electrically connected with the interface processing module.

Preferably, the power management module comprises a power management unit, an analog LDO unit, and a digital LDO unit; the analog LDO unit and the digital LDO unit are respectively and electrically connected with the power management unit; the analog LDO unit is electrically connected with the photosensitive image array, and the control register module, the clock generator, the analog-to-digital conversion module, the image processing module and the direction identification module are respectively electrically connected with the digital LDO unit.

Preferably, the LED constant current driving module includes a first field effect transistor, a second field effect transistor, a third field effect transistor, a constant current source, and a current configuration switch; the first end of the constant current source is electrically connected with the power management module, the second end of the constant current source is respectively electrically connected with the drain electrode of the first field effect tube, the grid electrode of the second field effect tube and the first end of the current configuration switch, the source electrode of the first field effect tube is grounded, the drain electrode of the second field effect tube is respectively electrically connected with the drain electrode of the third field effect tube and the LED lamp connecting end, the source electrode of the second field effect tube is grounded, the grid electrode of the third field effect tube is electrically connected with the second end of the current configuration switch, and the source electrode of the third field effect tube is grounded.

Preferably, the analog LDO unit includes a first amplifier, a first resistor, a first sliding resistor, and a first capacitor; the non-inverting input end of the first amplifier is used for inputting a reference voltage source, the inverting input end of the first amplifier is respectively and electrically connected with the first end of the first resistor and the first end of the first sliding resistor, the output end of the first amplifier is respectively and electrically connected with the second end of the first resistor, the first end of the first capacitor and the output end of the analog power source, the second end of the first sliding resistor is grounded, and the second end of the first capacitor is grounded.

In another aspect, the present invention also discloses another optical sensor, which includes the optical detection control circuit of the first aspect.

The optical detection control circuit has the following beneficial effects that: the device comprises a power management module, a control register module, a clock generator, a photosensitive image array, an analog-to-digital conversion module, an image processing module and a direction identification module; the control register module, the clock generator, the photosensitive image array, the analog-to-digital conversion module, the image processing module and the direction identification module are respectively and electrically connected with the power management module; the photosensitive image array is respectively and electrically connected with the analog-to-digital conversion module and the clock generator; the clock generator, the analog-to-digital conversion module, the image processing module and the direction identification module are respectively and electrically connected with the control register module; the power management module is electrically connected with the power input end and the ground end, and the control register module is electrically connected with the serial data end, the serial clock end and the signal output end respectively. The power management module is used for reliably supplying power to the circuit; the photosensitive image array is used for collecting image information; the analog-to-digital conversion module is used for converting the analog signal of the image information into a digital signal; the image processing module is used for carrying out image processing on the digital signal; the control register module is used for receiving an image processing result to realize optical movement detection; the direction identification module is used for realizing direction identification induction according to the image processing result.

The utility model can also realize close-range induction by acquiring the difference value of the exposure image when the LED is turned on and the non-exposure image when the LED is turned off in the adjacent time period; ambient light detection is realized by collecting photosensitive image difference values of different photosensitive units in adjacent time periods; in addition, the power management module is internally provided with the analog LDO and the digital LDO, an external capacitor is not needed, PAD is reduced, and chip area and wire binding packaging cost are saved; external capacitors and LDOs are not needed, and peripheral components and processing cost are reduced; the LED constant current driving module is internally provided with a constant current, so that the current can be configured, and an external current limiting resistor is omitted.

Meanwhile, the image processing module, the analog-to-digital conversion module and the LED constant current driving module are subjected to unified time sequence management, so that the anti-interference capability is obviously improved; the optical sensor is highly integrated, and functions of image acquisition and analysis processing, optical movement, close-range induction and the like are completed; the simple two-wire data clock interface can read corresponding results through an off-chip control chip. Therefore, the utility model has high integration level, can intensively realize the functions of optical movement, direction identification, close-range induction and ambient light detection, and reduces the cost of peripheral circuits.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only part of the embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive efforts according to the accompanying drawings:

FIG. 1 is a schematic block diagram of an optical detection control circuit in accordance with a preferred embodiment of the present invention;

FIG. 2 is a schematic block diagram of an optical detection control circuit according to another preferred embodiment of the present invention;

FIG. 3 is a circuit diagram of the power management module of an optical detection control circuit according to a preferred embodiment of the present invention;

fig. 4 is a circuit diagram of the LED constant current driving module of an optical detection control circuit according to a preferred embodiment of the present invention;

FIG. 5 is a circuit diagram of a photosensitive array image sampling control circuit of an optical inspection control circuit according to a preferred embodiment of the present invention;

FIG. 6 is a schematic diagram of an application of an optical sensor chip in cooperation with an external controller according to a preferred embodiment of the present invention;

fig. 7 is a schematic structural diagram of an optical sensor chip according to a preferred embodiment of the utility model.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.

Example one

Fig. 1 shows a preferred embodiment of the present invention, which includes a power management module 1, a control register module 2, a clock generator 3, a photosensitive image array 4, an analog-to-digital conversion module 5, an image processing module 6, and a direction identification module 7; the control register module 2, the clock generator 3, the photosensitive image array 4, the analog-to-digital conversion module 5, the image processing module 6 and the direction identification module 7 are respectively electrically connected with the power management module 1; the photosensitive image array 4 is respectively and electrically connected with the analog-to-digital conversion module 5 and the clock generator 3; the clock generator 3, the analog-to-digital conversion module 5, the image processing module 6 and the direction identification module 7 are respectively electrically connected with the control register module 2; the power management module 1 is electrically connected with a power input end VDD and a ground end GND, and the control register module 2 is electrically connected with a serial data end SDA, a serial clock end SCK and a signal output end INT respectively. The photosensitive image array 4 is used for collecting image information; the analog-to-digital conversion module 5 converts the analog signal of the image information into a digital signal; the image processing module 6 is configured to perform image processing on the digital signal; the control register module 2 is used for receiving an image processing result to realize optical movement detection; the direction identification module 7 is used for identifying induction according to the direction of the image processing result. Therefore, the utility model has high integration level, can intensively realize the functions of optical movement, direction identification, close-range induction and ambient light detection, and reduces the cost of peripheral circuits.

Preferably, in this embodiment, the analog-to-digital conversion module 5 performs analog-to-digital conversion and acquisition on the image value of each image (Pixel) unit of the photosensitive image array 4, so as to obtain an entire frame of image, and then sends the entire frame of image to the image processing module 6 for image processing.

In a preferred embodiment, the direction recognition module of this embodiment is configured to perform gesture sensing to realize direction recognition.

Preferably, referring to fig. 2, the optical detection control circuit further includes an LED constant current driving module 8; the LED constant current driving module 8 is electrically connected with the power management module 1, the clock generator 3, the control register module 2 and the LED lamp connecting end respectively.

Preferably, the optical detection control circuit further comprises an interface processing module 9; the interface processing module 9 is electrically connected with the power management module 1 and the control register module 2 respectively; the serial data end SDA and the serial clock end SCK are both electrically connected to the interface processing module 9.

In a preferred embodiment, the present invention also enables proximity sensing. When a target object approaches the photosensitive area of the sensing image array, the conversion value of the image changes, if no target object approaches, the value of the image is P0, if the value of the image is P1, and a threshold value Pth is set, when P1-P0> Pth, the approach of the target object is detected, otherwise, no image is detected. To obtain a more subdivided result, the present embodiment sets different thresholds Pth0, Pth1, … Pthn, thereby acquiring different degrees of approach of the target object.

In a preferred embodiment, the utility model also enables ambient light detection. The energy of infrared light and visible light in the general environment is larger, and the energy of ultraviolet light is smaller, so that the size of the environment light of the visible light can be obtained only by filtering the infrared light in the environment. In this embodiment, the photosensitive array is divided into a plurality of small areas that are uniform and equal, wherein the photosensitive cells in the gray portion are coated with an infrared filter (the wavelength is larger than 800 nm), and the image values of the coated area and the non-coated area are respectively counted and averaged to obtain Px and Py; (Py-Px) to obtain the image value of visible light (namely ambient light); the image processing module 6 stores the calculation result to the control register module 2; when applied, the (Py-Px) is obtained, and the size of the ambient light can be obtained through the lookup table value.

Preferably, referring to fig. 3, the power management module 1 includes a power management unit 11, an analog LDO unit 12, and a digital LDO unit 13; the analog LDO unit 12 and the digital LDO unit 13 are respectively electrically connected with the power management unit 11; the analog LDO unit 12 is electrically connected to the photosensitive image array 4, and the control register module 2, the clock generator 3, the analog-to-digital conversion module 5, the image processing module 6, and the direction identification module 7 are electrically connected to the digital LDO unit 13, respectively.

Preferably, referring to fig. 4, the LED constant current driving module 8 includes a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3, a constant current source T1, and a current configuration switch D1; the first end of the constant current source T1 is electrically connected to the power management module 1, the second end of the constant current source T1 is electrically connected to the drain of the first fet Q1, the gate of the first fet Q1, the gate of the second fet Q2 and the first end of the current configuration switch D1, respectively, the source of the first fet Q1 is grounded, the drain of the second fet Q2 is electrically connected to the drain of the third fet Q3 and the LED lamp connection terminal, the source of the second fet is grounded, the gate of the third fet is electrically connected to the second end of the current configuration switch D1, and the source of the third fet Q3 is grounded. It is understood that, in the present embodiment, the current configuration switch D1 is used to control the magnitude of the current to adjust the exposure intensity of the external LED.

Preferably, referring to fig. 3, the analog LDO unit includes a first amplifier L2, a first resistor R1, a first sliding resistor R2, and a first capacitor C0; the non-inverting input terminal of the first amplifier L2 is used for inputting a reference voltage source, the inverting input terminal of the first amplifier L2 is electrically connected to the first terminal of the first resistor R1 and the first terminal of the first sliding resistor R2, respectively, the output terminal of the first amplifier L2 is electrically connected to the second terminal of the first resistor R1, the first terminal of the first capacitor C0 and the analog power output terminal LDOA, respectively, the second terminal of the first sliding resistor R2 is grounded, and the second terminal of the first capacitor C is grounded. In this embodiment, the circuit structure of the digital LDO unit is the same as the circuit structure of the analog LDO unit, and is not described herein again.

Preferably, referring to fig. 5, the present invention performs image sampling on the photosensitive array image through the control of the image sampling circuit as shown in fig. 5; the system firstly initiates an RST signal to charge a D0 node, photosensitive voltage sampling is carried out by opening the SMP0 when exposure time is over, sampling voltage is stored in the C3, voltage sampling is carried out on the ADC by opening the SMP1, and the ADC converts the voltage into a digital voltage value.

Example two

The utility model also discloses another optical sensor which comprises the optical detection control circuit. In the present embodiment, when the optical sensor chip does not detect any operation for a certain time, the optical sensor chip enters a periodic operation (i.e., a sleep state), and the entire period is divided into an operating time and a sleep time. In order to save power consumption and avoid missing any operation, a corresponding working period and working time are configured.

In this embodiment, the optical sensor chip enters a sleep state, and during operation, the operating current of the optical sensor chip is: 1 mA; and standby power consumption of the chip during sleep: 2 uA. Setting the sleep period of the chip to be 50 ms; the working time is as follows: 1ms, thereby obtaining an average current:

iavg ═ (1mA × 1ms +50ms × 2uA)/50ms ═ 22 uA; in another preferred embodiment, the sleep period and the operation time may be adjusted according to the application requirements, so as to achieve the appropriate standby power consumption, which is not limited in detail herein.

EXAMPLE III

Preferably, referring to fig. 6, the optical sensor chip of the present invention may be used in cooperation with an external controller, and transmit data acquired through functions of optical movement, direction recognition, proximity sensing, ambient light detection, and the like, to the external controller through the signal output terminal INT, the serial data terminal SDA, and the serial clock terminal SCK, so as to be applied to different scenes, and have perfect functions, high integration, and improved user experience.

Example four

Preferably, referring to fig. 7, fig. 7 is a schematic view of an application structure of an optical sensor chip corresponding to the optical detection control circuit according to the present invention. The surface of the optical sensor chip is covered with a convex light-transmitting lens, the light-shielding shell covers the optical sensor chip, and a light-guiding hole is formed in the light-shielding shell and is positioned right above the light-transmitting lens; infrared LED is located the shading casing outside, the optical sensor chip is connected with infrared LED electricity, optical sensor chip control infrared LED transmits infrared light, infrared light that infrared LED transmitted reflects when meetting the target object passes through the leaded light hole and spreads into inside the shading casing, furthermore, infrared light gathers the optical sensor chip through the printing opacity camera lens, and through the inside sensitization image acquisition and the operation processing of optical sensor chip, thereby realize the detection to the target object, like the position distance of target object, direction of motion etc. is close the induction system. Through the combination of the optical sensor chip, the light-transmitting lens and the shading shell, the detection sensitivity of the optical sensor is improved, and the interference of external environment light to the optical sensor is reduced.

In summary, the optical detection control circuit provided by the present invention includes a power management module 1, a control register module 2, a clock generator 3, a photosensitive image array 4, an analog-to-digital conversion module 5, an image processing module 6, and a direction identification module 7; the control register module 2, the clock generator 3, the photosensitive image array 4, the analog-to-digital conversion module 5, the image processing module 6 and the direction identification module 7 are respectively electrically connected with the power management module 1; the photosensitive image array 4 is respectively and electrically connected with the analog-to-digital conversion module 5 and the clock generator 3; the clock generator 3, the analog-to-digital conversion module 5, the image processing module 6 and the direction identification module 7 are respectively electrically connected with the control register module 2; the power management module 1 is electrically connected with a power input end VDD and a ground end GND, and the control register module 2 is electrically connected with a serial data end SDA, a serial clock end SCK and a signal output end INT respectively. The power management module is used for reliably supplying power to the circuit; the photosensitive image array is used for collecting image information; the analog-to-digital conversion module is used for converting the analog signal of the image information into a digital signal; the image processing module is used for carrying out image processing on the digital signal; the control register module is used for receiving an image processing result to realize optical movement detection; the direction identification module is used for realizing direction identification induction according to the image processing result.

The utility model can also realize close-range induction by acquiring the difference value of the exposure image when the LED is turned on and the non-exposure image when the LED is turned off in the adjacent time period; ambient light detection is realized by collecting photosensitive image difference values of different photosensitive units in adjacent time periods; in addition, the power management module is internally provided with the analog LDO and the digital LDO, an external capacitor is not needed, PAD is reduced, and chip area and wire binding packaging cost are saved; external capacitors and LDOs are not needed, and peripheral components and processing cost are reduced; the LED constant current driving module is internally provided with a constant current, so that the current can be configured, and an external current limiting resistor is omitted;

meanwhile, the image processing module, the analog-to-digital conversion module and the LED constant current driving module are subjected to unified time sequence management, so that the anti-interference capability is obviously improved; the optical sensor is highly integrated, and functions of image acquisition and analysis processing, optical movement, close-range induction and the like are completed; the simple two-wire data clock interface can read corresponding results through an off-chip control chip. Therefore, the utility model has high integration level, can intensively realize the functions of optical movement, direction identification, close-range induction and ambient light detection, and reduces the cost of peripheral circuits.

The optical detection control circuit and the optical sensor provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be a change in the specific implementation and application scope, and in summary, the content of the present specification is only an implementation of the present invention, and not a limitation to the scope of the present invention, and all equivalent structures or equivalent flow transformations made by the content of the present specification and the attached drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention. And should not be construed as limiting the utility model.

Claims (7)

1. An optical detection control circuit, comprising: the device comprises a power management module, a control register module, a clock generator, a photosensitive image array, an analog-to-digital conversion module, an image processing module and a direction identification module; the control register module, the clock generator, the photosensitive image array, the analog-to-digital conversion module, the image processing module and the direction identification module are respectively and electrically connected with the power management module; the photosensitive image array is respectively and electrically connected with the analog-to-digital conversion module and the clock generator; the clock generator, the analog-to-digital conversion module, the image processing module and the direction identification module are respectively and electrically connected with the control register module; the power management module is electrically connected with the power input end and the ground end, and the control register module is electrically connected with the serial data end, the serial clock end and the signal output end respectively.

2. An optical detection control circuit according to claim 1, wherein the optical detection control circuit further comprises an LED constant current driving module; the LED constant current driving module is respectively and electrically connected with the power management module, the clock generator, the control register module and the LED lamp connecting end.

3. An optical detection control circuit according to claim 1 or 2, wherein said optical detection control circuit further comprises an interface processing module; the interface processing module is respectively and electrically connected with the power management module and the control register module; the serial data end and the serial clock end are both electrically connected with the interface processing module.

4. An optical detection control circuit as claimed in claim 1, wherein the power management module comprises a power management unit, an analog LDO unit, and a digital LDO unit; the analog LDO unit and the digital LDO unit are respectively and electrically connected with the power management unit; the analog LDO unit is electrically connected with the photosensitive image array, and the control register module, the clock generator, the analog-to-digital conversion module, the image processing module and the direction identification module are respectively electrically connected with the digital LDO unit.

5. The optical detection control circuit according to claim 2, wherein the LED constant current driving module comprises a first fet, a second fet, a third fet, a constant current source, and a current configuration switch; the first end of the constant current source is electrically connected with the power management module, the second end of the constant current source is respectively electrically connected with the drain electrode of the first field effect tube, the grid electrode of the second field effect tube and the first end of the current configuration switch, the source electrode of the first field effect tube is grounded, the drain electrode of the second field effect tube is respectively electrically connected with the drain electrode of the third field effect tube and the LED lamp connecting end, the source electrode of the second field effect tube is grounded, the grid electrode of the third field effect tube is electrically connected with the second end of the current configuration switch, and the source electrode of the third field effect tube is grounded.

6. An optical detection control circuit according to claim 4, wherein the analog LDO unit comprises a first amplifier, a first resistor, a first sliding resistor and a first capacitor; the non-inverting input end of the first amplifier is used for inputting a reference voltage source, the inverting input end of the first amplifier is respectively and electrically connected with the first end of the first resistor and the first end of the first sliding resistor, the output end of the first amplifier is respectively and electrically connected with the second end of the first resistor, the first end of the first capacitor and the output end of the analog power source, the second end of the first sliding resistor is grounded, and the second end of the first capacitor is grounded.

7. An optical sensor comprising an optical detection control circuit as claimed in any one of claims 1 to 6.

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