Adaptive dimming method and system based on optical sensor

Abstract

The invention discloses a self-adaptive dimming method and system based on an optical sensor, and belongs to the technical field of intelligent wearable equipment. Optical signals required by a receiving module are set through actual application, the received optical signals can be kept within a required range at any time through the dimming technology, the optical performance is guaranteed, and the dimming effect is improved. Redundancy and waste of power consumption of the driving current are avoided; besides, by introducing the corrected recorded light intensity and the predicted final output light intensity Iz, compared with a mode of gradually adjusting the reflected light intensity through feedback, the output light intensity meeting the actual demand of a user can be rapidly and more accurately determined, so that the dimming efficiency is improved, and the energy consumption in the dimming process is reduced. After the ambient light is identified, the direct current component of the ambient light is eliminated, and the ambient light is filtered, so that the signal processing module can be effectively prevented from reaching the upper limit due to over-strong ambient light.

Description

Technical Field

[0001] This invention belongs to the field of smart wearable device technology, specifically relating to an adaptive dimming method and system based on optical sensors. Background Technology

[0002] Smart wearable devices, including smartwatches, headphones, and AR / VR products, are portable devices that utilize various technologies such as software support and cloud interaction to achieve their functions. They are widely used in entertainment, sports, and healthcare. In recent years, with rising income levels, people have increasingly higher demands for portable, intelligent, and functionally integrated electronic products. Coupled with the rapid development of wireless technology, cloud computing, and AI, smart wearable devices have entered a period of rapid development. Various sensors have been effectively applied in wearable devices, leading to a continuous increase in their market demand.

[0003] In its early stages, smartwatch development suffered from limitations such as limited functionality, an incomplete ecosystem, and an immature operating system. Most communication functions (such as making calls and receiving messages) required a connection to a smartphone, often necessitating software downloads or app updates for more features, leading to its perception as an accessory to smartphones. However, with the introduction of eSIM cards and the increasing maturity of the smartwatch ecosystem, this situation has been effectively resolved, and smartwatches have begun to function as independent products. Most smartwatches are equipped with optical chips for detecting human health indicators, such as heart rate, blood oxygen, and stress levels. Due to differences in skin tone, skin texture, and wearing position, the reflectivity of light varies, requiring optical chips to adapt to different detection conditions and adjusting brightness accordingly. This necessitates high real-time performance and accuracy in brightness adjustment, as well as adaptability to varying wearing conditions and changes in ambient light. Furthermore, wearable devices have limited battery capacity, resulting in high power consumption requirements. To address these issues, this invention provides the following technical solutions. Summary of the Invention

[0004] The purpose of this invention is to provide an adaptive dimming method and system based on optical sensors, which solves the problem that the detection accuracy of smart wearable devices is greatly affected by skin color and the intelligent dimming efficiency is low in the prior art.

[0005] The objective of this invention can be achieved through the following technical solutions: An adaptive dimming method based on an optical sensor, comprising the following steps: Step 1: Set an initial emitted light intensity Iy. When adjusting the light, the optical emitting device first outputs emitted light with an intensity of Iy, and then the reflected light is received by the optical receiving device to obtain the real-time reflected light intensity. The real-time final emitted light intensity Iz corresponding to the real-time reflected light intensity is obtained based on the relationship curve between the reflected light intensity and the final emitted light intensity. Step 2: Compare the real-time final output light intensity Iz with the corrected recorded light intensity, and select the corrected recorded light intensity that is closest to the final output light intensity as the target light intensity. When there is no corrected recorded light intensity, the calculated real-time final output light intensity is taken as the target light intensity; the output light intensity of the optical emitting device is the emitted light of the target light intensity. The corrected recorded light intensity refers to the typical value of the light intensity output by the optical emitting device when the user is actually wearing the smart wearable device; Step 3: The optical receiving device receives the reflected light. After the central microprocessor unit obtains the intensity If of the reflected light, it determines whether the intensity of the reflected light is within the required target range. If it is not within the range, the central microprocessor unit adjusts accordingly to increase or decrease the intensity of the emitted light from the light emitting device. If the dimming is within the target range, then stop dimming.

[0006] As a further aspect of the present invention, the relationship curve between the intensity of the reflected light and the intensity of the final emitted light is obtained as follows: By repeating experiments, the intensity of reflected light I1 collected by the optical receiver when the optical emitter emits a light with intensity Iy, and the intensity of the final emitted light I2 corresponding to the final intensity of reflected light that meets the target, are obtained in different skin color samples. Thus, the coordinate parameters (I1, I2) corresponding to each skin color sample are obtained. A Cartesian coordinate system is established with I1 as the abscissa and I2 as the ordinate. The coordinate parameters corresponding to each skin color sample are plotted in this Cartesian coordinate system, and then the relationship curve is obtained by fitting.

[0007] As a further aspect of the present invention, the method for calculating the corrected recording light intensity is as follows: When a user actually wears a smart wearable device, whenever the optical transmitter is in a non-dimming working state, the intensity of the emitted light from the optical transmitter is recorded once every preset time difference, and these intensities are marked as Ri, where i is a natural number representing the sequence number; The acquired light intensity data Ri is cleaned to remove abnormal data. The average value of the remaining light intensity data Ri is calculated and used as the corrected record light intensity for the corresponding user.

[0008] As a further aspect of the present invention, before comparing the real-time final output light intensity Iz with the corrected recorded light intensity, it is first necessary to determine the user actually wearing the smart wearable device, and then obtain the corrected recorded light intensity corresponding to the user and compare it with the real-time final output light intensity Iz.

[0009] As a further aspect of the present invention, when the intensity of the reflected light is less than the minimum value of the target, the intensity of the emitted light from the light emitting device is increased; when the intensity of the reflected light is greater than the maximum value of the target, the intensity of the emitted light from the light emitting device is decreased.

[0010] As a further aspect of the present invention, during the dimming process, the sampling frequency of the analog front end is increased, and after the dimming is completed, the sampling frequency is reduced to a preset value.

[0011] As a further aspect of the present invention, the central microprocessor unit first reduces the gain of the analog front end to the minimum before dimming, and then configures the gain to the normal operating gain after dimming is completed.

[0012] As a further aspect of the present invention, before dimming, the optical emission module is turned off, the receiving module receives ambient light data, the simulated front end filters the ambient light, and then the optical emission device is turned on.

[0013] As a further aspect of the present invention, if there are multiple light sources, the light signals corresponding to the multiple light sources need to simultaneously meet the set light signal requirement target in order to complete the dimming process.

[0014] This application also discloses an adaptive dimming system based on an optical sensor for performing the dimming method described above. The system includes an optical receiving device, an optical transmitting device, an analog front end, and a central microprocessor unit. An optical emitting device used for periodic emission of light; An optical receiving device, used to receive the reflected light from the light emitted by the light emitting device after it has been emitted from the reflecting surface; The analog front end is used to convert the reflected light signal received by the optical receiving device into a digital signal; The central microprocessor unit configures and regulates other modules through registers.

[0015] The beneficial effects of this invention are: This invention sets the required optical signal for the receiving module through practical application. This dimming technology can keep the received optical signal within the required range at all times, which not only ensures optical performance, but also avoids redundant and wasteful drive current power consumption. In addition, by introducing the correction recording light intensity and the predicted final output light intensity Iz, compared with the method of gradually adjusting the reflected light intensity through feedback, the output light intensity that meets the user's actual needs can be determined quickly and more accurately, thereby improving dimming efficiency and reducing energy consumption in the dimming process.

[0016] This invention identifies ambient light and then filters it by eliminating the DC component of the ambient light, effectively preventing excessively strong ambient light from causing the signal processing module to reach its limit. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a simplified structural diagram of an adaptive dimming system based on an optical sensor according to the present invention; Figure 2 This is a flowchart illustrating an adaptive dimming method based on optical sensors. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 An adaptive dimming system based on optical sensors, such as Figure 1 As shown, it includes an optical receiving device, an optical transmitting device, an analog front-end, and a central microprocessor unit.

[0021] The optical emitting device, which emits light as a light source, can use an LED, and the magnitude of its driving current can be configured in the range of 0~200mA through a register; An optical receiving device is used to receive the reflected light from the optical transmitting device after it is emitted from the transmitting surface; a photodiode may be used. The analog front end is used to convert the reflected light signal received by the optical receiving device into a digital signal; The central microprocessor unit configures and regulates other modules through registers.

[0022] An adaptive dimming method based on an optical sensor, which is executed through the aforementioned dimming system, such as... Figure 2 As shown, specifically, the method includes the following steps: Step 1: Set an initial emitted light intensity Iy. When the dimming process is started, the optical emitting device first outputs emitted light with an intensity of Iy, then the reflected light is received by the optical receiving device, and then the reflected light signal is converted into a reflected light digital signal by the analog front end to obtain the real-time reflected light intensity. The real-time final emitted light intensity Iz corresponding to the real-time reflected light intensity is obtained based on the relationship curve between the reflected light intensity and the final emitted light intensity. The final emitted light intensity refers to the emitted light intensity when the intensity of the reflected light received by the optical receiving device meets the required target. The aforementioned target requirement refers to the range of reflected light intensity that can guarantee detection accuracy; The relationship curve between the intensity of reflected light and the intensity of final emitted light is obtained as follows: By repeating experiments, we obtained the reflected light intensity I1 collected by the optical receiver when the optical emitter emits a light with intensity Iy under different skin color conditions, and the final emitted light intensity I2 corresponding to the reflected light intensity that meets the target of each sample. Thus, we obtained the coordinate parameters (I1, I2) corresponding to each skin color sample. A Cartesian coordinate system is established with I1 as the abscissa and I2 as the ordinate. The coordinate parameters corresponding to each skin color sample are plotted in this Cartesian coordinate system, and then the relationship curve is obtained by fitting.

[0023] Step 2: Compare the real-time final output light intensity Iz with the corrected recorded light intensity, and select the corrected recorded light intensity that is closest to the final output light intensity as the target light intensity. When there is no corrected recorded light intensity, the calculated real-time final output light intensity is used as the target light intensity. The optical emitting device outputs emitted light with an intensity equal to the target light intensity; The corrected recorded light intensity refers to the typical value of the light intensity output by the optical emitting device when the user actually wears the smart wearable device; The method for calculating the corrected recorded light intensity is as follows: When a user actually wears a smart wearable device, whenever the optical transmitter is in a non-dimming working state, the intensity of the emitted light from the optical transmitter is recorded once every preset time difference, and these intensities are marked as Ri, where i is a natural number representing the sequence number; A set of light intensity data Ri is acquired and cleaned to remove data with obvious deviations. The average value of the remaining light intensity data Ri is then calculated and used as the corrected record light intensity for the corresponding user.

[0024] It is important to note that since the same smart wearable device may be worn by multiple users, or worn by the same user in different positions (such as a smart bracelet, which may be worn alternately on both hands, and the skin color of the two hands may be different), the same smart wearable device may correspond to multiple corrected light intensity records, so the data also needs to be classified. For example, by comparing parameters such as heart rate, light intensity of emitted light when the optical emission device is in the non-dimming stage, and blood oxygen content when collecting light intensity data of each emitted light, different wearers or wearing positions can be distinguished. For example, different wearers can be distinguished by their accounts; In addition, when calculating the corrected recorded light intensity, it is preferable to use data within a certain time range, such as starting from the current moment and backtracking to calculate the corrected recorded light intensity within a range of the past 2 hours. The purpose is to reduce the interference of skin color changes on the data, such as when a user wears a smart wearable device and works in the sun, there may be a large change in skin color in a short period of time.

[0025] In this step, by introducing a correction recording light intensity, compared to adjusting the output light intensity by the real-time final output light intensity Iz, this application can quickly and more accurately determine the output light intensity that meets the user's actual needs, thereby improving dimming efficiency and reducing energy consumption in the dimming process.

[0026] Step 3: The optical receiving device receives the reflected light. After the central microprocessor unit obtains the intensity If of the reflected light, it determines whether the intensity of the reflected light is within the required target range. If it is not within the range, the central microprocessor unit adjusts accordingly to increase or decrease the intensity of the emitted light from the light emitting device. If the dimming is within the target range, then stop dimming.

[0027] Specifically, when the intensity of the reflected light is less than the minimum value of the target, the intensity of the emitted light from the light emitting device is increased; when the intensity of the reflected light is greater than the maximum value of the target, the intensity of the emitted light from the light emitting device is decreased.

[0028] Step 4: Continuously monitor the light signal received by the optical receiving device. When the light signal exceeds the required range, restart the dimming process to cope with complex reflection conditions and changes in external ambient light.

[0029] Example 2 During the dimming process, the sampling frequency of the analog front end can be appropriately increased, and after the dimming is completed, the sampling frequency can be reduced to a preset value. This can ensure the efficiency of the dimming process while reducing the energy consumption of daily work.

[0030] Specifically, to accelerate dimming speed and improve its efficiency and real-time performance, the central microprocessor unit needs to increase the sampling rate of the analog front-end to 200Hz before dimming. The analog front-end has an upper limit to its ability to convert optical signals into digital signals; to ensure the maximum available optical signal, the central microprocessor unit needs to minimize the gain of the analog front-end before dimming.

[0031] In addition, the optical receiving module is subject to interference from ambient light signals. Ambient light affects the linear relationship between the driving current of the transmitting module and the optical signal of the receiving module. The analog front end uses time-division processing to filter ambient light. First, the optical transmitting module is turned off, the receiving module receives the data of ambient light, and the ambient light signal is eliminated. Then, the optical transmitting device is turned on, and the optical receiving device receives the reflected light signal from the reflective surface.

[0032] After completing one dimming cycle, the central microprocessor unit configures the analog front-end gain and sampling rate to return to the working mode, and continuously monitors the light signal received by the optical receiver in this mode. When the light signal exceeds the required range, the dimming cycle is restarted again; this process is repeated to achieve adaptive dimming of the smart wearable device.

[0033] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. An adaptive dimming method based on an optical sensor, characterized in that, The method includes the following steps: Step 1: Set an initial emitted light intensity Iy. When adjusting the light, the optical emitting device first outputs emitted light with an intensity of Iy, and then the reflected light is received by the optical receiving device to obtain the real-time reflected light intensity. The real-time final emitted light intensity Iz corresponding to the real-time reflected light intensity is obtained based on the relationship curve between the reflected light intensity and the final emitted light intensity. Step 2: Compare the real-time final output light intensity Iz with the corrected recorded light intensity, and select the corrected recorded light intensity that is closest to the final output light intensity as the target light intensity. When there is no corrected recorded light intensity, the calculated real-time final output light intensity is used as the target light intensity. The optical emitting device outputs emitted light with an intensity equal to the target light intensity; The corrected recorded light intensity refers to the typical value of the light intensity output by the optical emitting device when the user is actually wearing the smart wearable device; Step 3: The optical receiving device receives the reflected light. After the central microprocessor unit obtains the intensity If of the reflected light, it determines whether the intensity of the reflected light is within the required target range. If it is not within the range, the central microprocessor unit adjusts accordingly to increase or decrease the intensity of the emitted light from the light emitting device. If the dimming is within the target range, the dimming process ends.

2. The adaptive dimming method based on an optical sensor according to claim 1, characterized in that, The relationship curve between the intensity of reflected light and the intensity of final emitted light is obtained as follows: By repeating experiments, the intensity of reflected light I1 collected by the optical receiver when the optical emitter emits a light with intensity Iy, and the intensity of the final emitted light I2 corresponding to the final intensity of reflected light that meets the target, are obtained in different skin color samples. Thus, the coordinate parameters (I1, I2) corresponding to each skin color sample are obtained. A Cartesian coordinate system is established with I1 as the abscissa and I2 as the ordinate. The coordinate parameters corresponding to each skin color sample are plotted in this Cartesian coordinate system, and then the relationship curve is obtained by fitting.

3. The adaptive dimming method based on an optical sensor according to claim 1, characterized in that, The method for calculating the corrected recorded light intensity is as follows: When a user actually wears a smart wearable device, whenever the optical transmitter is in a non-dimming working state, the intensity of the emitted light from the optical transmitter is recorded once every preset time. These intensities are marked as Ri, where i is a natural number representing the sequence number. The acquired light intensity data Ri is cleaned to remove abnormal data. The average value of the remaining light intensity data Ri is calculated and used as the corrected record light intensity for the corresponding user.

4. The adaptive dimming method based on an optical sensor according to claim 1, characterized in that, Before comparing the real-time final output light intensity Iz with the corrected recorded light intensity, it is first necessary to identify the actual user wearing the smart wearable device, and then obtain the corrected recorded light intensity corresponding to that user and compare it with the real-time final output light intensity Iz.

5. The adaptive dimming method based on an optical sensor according to claim 1, characterized in that, When the intensity of the reflected light is less than the minimum value of the target, the intensity of the emitted light from the light emitting device is increased; when the intensity of the reflected light is greater than the maximum value of the target, the intensity of the emitted light from the light emitting device is decreased.

6. The adaptive dimming method based on an optical sensor according to claim 1, characterized in that, During dimming, the sampling frequency of the analog front end is increased, and after dimming ends, the sampling frequency is reduced to a preset value.

7. The adaptive dimming method based on an optical sensor according to claim 1, characterized in that, Before dimming, the central microprocessor unit first reduces the gain of the analog front end to the minimum, and after dimming is completed, it configures the gain to the normal operating gain.

8. The adaptive dimming method based on an optical sensor according to claim 1, characterized in that, Before dimming, the optical emission module is turned off, the receiving module receives ambient light data, the simulated front end filters the ambient light, and then the optical emission device is turned on.

9. The adaptive dimming method based on an optical sensor according to claim 1, characterized in that, If there are multiple light sources, the light signals corresponding to these multiple light sources must simultaneously meet the set light signal requirements in order to complete the dimming process.

10. An adaptive dimming system based on an optical sensor, used to execute the dimming method according to any one of claims 1 to 9, characterized in that, It includes an optical receiving device, an optical transmitting device, an analog front-end, and a central microprocessor unit; An optical emitting device used for periodic emission of light; An optical receiving device, used to receive the reflected light from the light emitted by the light emitting device after it has been emitted from the reflecting surface; The analog front end is used to convert the reflected light signal received by the optical receiving device into a digital signal; The central microprocessor unit configures and regulates other modules through registers.

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