Screen brightness self-adaptive adjusting system and method based on ambient light induction
The screen brightness adaptive adjustment system, which uses ambient light sensing, utilizes illuminance calibration and real-time compensation modules to compensate for measurement errors caused by waveguide length differences and microprism directionality in real time. This solves the problem of uneven screen brightness and achieves precise brightness adjustment and energy consumption optimization.
Patent Information
- Application Number
- CN202511358051.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-23
- Publication Date
- 2025-12-12
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
While maintaining a zero-aperture appearance, how can we compensate for multi-source measurement errors caused by waveguide length differences and microprism directionality in real time, and solve the problems of screen brightness jumps and insufficient readability in local overexposure or dark areas?
An ambient light-sensing-based screen brightness adaptive adjustment system is adopted, including an illuminance calibration module, a real-time compensation module, an average illuminance calculation module, and a backlight driving module. By covering the screen area with standard illuminance, the system synchronously collects the initial current, calculates the gain coefficient, periodically triggers photodiodes, performs real-time compensation and weighted averaging, and drives the backlight module to adjust the brightness.
It achieves precise compensation for multi-source measurement errors while maintaining a zero-aperture appearance, avoiding brightness jumps, improving outdoor readability and reducing energy consumption.
Smart Images
Figure CN121122197A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of brightness adaptive adjustment, in particular to a screen brightness adaptive adjustment system based on ambient light sensing. BACKGROUND
[0002] In the trend of increasingly pursuing extremely narrow frame or even zero opening form of full-screen intelligent terminal without forehead, vehicle-mounted central control and industrial visual panel, the industry begins to adopt layered light path separation-waveguide combined cover plate structure LSSC, which converts the lateral ambient light with an incident angle of about thirty to eighty degrees by ninety degrees through a micro-prism array and leads it into the internal waveguide of the glass, and then converges to the photodiode at the four corners of the screen to realize the pixel zero-shielding area level ambient illumination collection; the system can thus adjust the backlight brightness in real time in complex scenes such as tunnel entry and exit, side window strong light and night low illumination, thereby improving outdoor readability, reducing energy consumption and avoiding glare.
[0003] However, the inherent waveguide length difference and micro-prism directional coupling effect of the LSSC cover plate cause the light attenuation and folding efficiency to change significantly with the angle, and even if in the same light field, the current output of the photodiode at the four corners also has obvious deviation, if the traditional single-point average illumination estimation and direct linear driving of the backlight are continued, the screen will have brightness jump, local overexposure or insufficient readability in dark areas. Therefore, how to compensate the multi-source measurement error caused by the waveguide length difference and micro-prism directionality in real time while maintaining the zero-opening appearance, and robustly map the corrected illumination to the backlight driving signal conforming to human factors, has become the core technical problem to be solved by the present application. SUMMARY
[0004] The purpose of the present application is to solve the problem in the prior art of how to compensate the multi-source measurement error caused by the waveguide length difference and micro-prism directionality in real time while maintaining the zero-opening appearance, and a screen brightness adaptive adjustment system and method based on ambient light sensing are proposed.
[0005] In order to solve the problems existing in the prior art, the present application adopts the following technical solutions: The screen brightness adaptive adjustment system based on ambient light sensing comprises: An illumination calibration module is used to cover the effective area of the to-be-tested screen with standard illumination, and simultaneously collect the initial current of each screen corner in the to-be-tested screen, and calculate the gain coefficient of the screen corner; A real-time compensation module is used to calculate the compensation local illumination of the to-be-tested screen according to the real-time current and gain coefficient of the screen corner when the to-be-tested screen is running; An average illumination calculation module is used to calculate the average illumination according to the waveguide physical length of the screen corner and the compensation local illumination; The directionality compensation module is configured to determine whether to compensate the average illuminance according to the compensated local illuminance. The backlight driving module is configured to drive the backlight module according to the average illuminance.
[0006] Preferably, the effective area of the to-be-tested screen is covered by the standard illuminance, and the initial current of each screen corner in the to-be-tested screen is synchronously collected, including: The full-darkroom environment of the to-be-tested screen is constructed; In the full-darkroom test environment, the uniform standard illuminance is generated in the full-darkroom environment by the high-precision light illumination device; The initial current of the screen corner under the standard illuminance is synchronously collected by the photodiode.
[0007] Preferably, the gain coefficient of the screen corner is calculated, including: The gain coefficient of the screen corner is calculated according to the linear relationship between the standard illuminance and the initial current, wherein the calculation formula of the gain coefficient is as follows:
[0008] Preferably, the compensated local illuminance of the to-be-tested screen is calculated according to the real-time current of the screen corner and the gain coefficient, including: The photodiode of the screen corner is periodically triggered, and the real-time current of the screen corner is collected; The real-time current and the gain coefficient are multiplied to obtain the compensated local illuminance of the to-be-tested screen, wherein the calculation formula of the compensated local illuminance is as follows:
[0009] Preferably, the average illuminance is calculated according to the waveguide physical length of the screen corner and the compensated local illuminance, including: The screen corner is grouped according to the waveguide physical length, and the difference rate of the two groups is calculated; If the difference rate exceeds the preset difference threshold, the low-difference group in the two groups is selected, and the compensated local illuminance is weighted and averaged according to the weight of the low-difference group to obtain the average illuminance in the low-difference group; If the difference rate does not exceed the preset difference threshold, the compensated local illuminance is weighted and averaged according to the weight of all screen corners to obtain the average illuminance of the to-be-tested screen.
[0010] Preferably, the screen corner is grouped according to the waveguide physical length, and the difference rate of the two groups is calculated, including: If the waveguide physical length of the screen corner does not exceed the preset length threshold, the waveguide physical length is classified as a short waveguide group, otherwise, the waveguide physical length is classified as a long waveguide group; The weight of the screen corner is calculated according to the waveguide physical length, wherein the calculation formula of the weight is as follows:
[0011] For the short waveguide group and the long waveguide group, the compensation local illuminance is weighted and averaged according to the weight, and the short waveguide group average and the long waveguide group average are obtained respectively; According to the short waveguide group average and the long waveguide group average, the difference rate of the two groups is calculated, and the calculation formula of the difference rate is as follows:
[0012] Preferably, whether the average illuminance is compensated is judged according to the compensation local illuminance, comprising: According to the compensation local illuminance of the upper left and lower left screen corners, the x-axis group illuminance of the to-be-tested screen is calculated; According to the compensation local illuminance of the upper right and lower right screen corners, the y-axis group illuminance of the to-be-tested screen is calculated;
[0013] Preferably, the backlight module is driven according to the average illuminance, comprising: The linear constant and the offset of factory calibration are obtained; The average illuminance is substituted into the hardware drive mapping formula to obtain the original brightness control signal, wherein the hardware drive mapping formula is as follows:
[0014] The original brightness control signal is limited in the range of 0-1 and converted into a pulse width modulation duty cycle; The duty cycle is written into the register of the backlight module to drive the backlight module to adjust the luminous brightness.
[0015] In order to solve the above problems, the present application also provides a screen brightness self-adaptive adjustment method based on ambient light sensing, which comprises: S1, the effective area of the to-be-tested screen is covered by the standard illuminance, and the initial current of each screen corner in the to-be-tested screen is synchronously collected, and the gain coefficient of the screen corner is calculated; S2, when the to-be-tested screen is running, the compensation local illuminance of the to-be-tested screen is calculated according to the real-time current of the screen corner and the gain coefficient; S3, the average illuminance is calculated according to the waveguide physical length of the screen corner and the compensation local illuminance; S4, whether the average illuminance is compensated is judged according to the compensation local illuminance; S5, the backlight module is driven according to the average illuminance.
[0016] Compared with the prior art, the present application has the following advantages: 1、In the present application, the illuminance calibration module covers the effective area of the screen to be tested with standard illuminance, synchronously collects the initial current of each screen corner and calculates the gain coefficient, establishes the linear mapping relationship between the standard illuminance and the initial current, quantifies the photoelectric conversion deviation caused by the waveguide path difference, and provides the basic parameters for subsequent real-time compensation, thereby laying the foundation for deviation correction from the hardware characteristic level.
[0017] 2、In the present application, the real-time compensation and average illuminance calculation modules form a dynamic error correction closed loop. The real-time compensation module periodically collects the real-time current of the screen corner and calculates the gain coefficient to obtain the compensated local illuminance, thereby eliminating the initial deviation caused by the waveguide length difference; the average illuminance calculation module groups and calculates the difference rate according to the physical length of the waveguide, and calculates the average illuminance by using low-difference group weighting or full-screen corner weighting for different difference degrees, thereby further filtering the measurement noise caused by significant path length difference, and making the ambient light intensity data more consistent with the actual scene.
[0018] 3、The directional compensation module calculates the x-axis and y-axis group illuminance and compares the directional ratio to compensate for the light intensity difference exceeding the human eye perception threshold, thereby solving the horizontal / vertical light intensity deviation caused by the directional coupling effect of the micro-prism; the backlight driving module converts the corrected average illuminance into the pulse width modulation duty cycle through a hardware driving mapping formula, drives the backlight module to adaptively adjust the brightness, retains the appearance advantage of the LSSC cover plate pixel zero shielding, avoids the brightness jump, local overexposure and other problems caused by the traditional single-point average method, improves the outdoor readability and reduces the energy consumption. BRIEF DESCRIPTION OF DRAWINGS
[0019] The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate certain illustrative embodiments of the present application and are used to explain the present application, but do not limit the present application. In the drawings: Figure 1 A functional module diagram of the screen brightness adaptive adjustment system based on ambient light sensing provided by an embodiment of the present application is shown in FIG. 1. Figure 2 A flowchart of the screen brightness adaptive adjustment method based on ambient light sensing provided by an embodiment of the present application is shown in FIG. 2. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application.
[0021] Embodiment: The present embodiment provides a screen brightness adaptive adjustment system based on ambient light sensing, as shown in FIG. 1, which specifically includes: Figure 1 An illuminance calibration module is configured to cover an effective area of the to-be-tested screen with standard illuminance, synchronously collect initial current of each screen corner in the to-be-tested screen, and calculate gain coefficients of the screen corners. Specifically, although the micro-prism in the layered light path separation-guide-integrated cover plate can fold 90° the lateral ambient light into the waveguide groove and send it to the four-corner photodiode, realize the pixel zero-shading advantage of physical separation of display forward light and direct pixel area, and cause measurement deviation due to the difference in waveguide path length. To solve the measurement deviation problem caused by the hardware structure, the effective area of the to-be-tested screen is covered with standard illuminance to simulate uniform and stable ambient light conditions. The initial current of each screen corner in the to-be-tested screen is synchronously collected because different screen corners will output different initial currents under the same standard illuminance due to the difference in waveguide path. By calculating the gain coefficients of the screen corners, the corresponding relationship between the standard illuminance and the initial current of the corresponding screen corner is provided as a basis for subsequent real-time current compensation for the illuminance measurement deviation caused by the difference in waveguide path, ensuring that the subsequent screen brightness adaptive adjustment based on ambient light sensing is more accurate and reliable.
[0022] In the embodiment of the present application, the effective area of the to-be-tested screen is covered with standard illuminance, and the initial current of each screen corner in the to-be-tested screen is synchronously collected, including: A full darkroom environment of the to-be-tested screen is constructed to create a closed space environment that can only receive the preset standard illuminance and can receive only the preset standard illuminance. By isolating external stray light, the effect of eliminating ambient light interference is achieved. The reason for performing this operation is to provide a pure environment for accurate application of standard illuminance and accurate collection of initial current. In the full darkroom test environment, a uniform standard illuminance is generated in the full darkroom environment by a high-precision light device, and stable and uniform light is output by a high-precision device to provide quantifiable and consistent ambient light input for the screen. The reason for performing this operation is to ensure that different screen corners receive the same standard light, thereby laying a unified foundation for subsequent gain coefficient calculation. The photodiode of the screen corner synchronously collects the initial current under the standard illuminance to provide measured data for calculating the gain coefficients of the corners, and to adapt to the current deviation compensation requirement caused by the difference in waveguide path of the LSSC cover plate.
[0023] In the embodiment of the present application, the gain coefficients of the screen corners are calculated, including: According to the linear relationship between the standard illuminance and the initial current, the gain coefficients of the screen corners are calculated, wherein the calculation formula of the gain coefficients is as follows:
[0024] In detail, the gain coefficient is used to measure the conversion relationship between the screen angle ambient light and the current signal. Since the screen adopts a layered light path separation-guide-integrated cover plate, the waveguide path lengths of different screen angles are different, resulting in a deviation in the current response of the photodiode to the same light. The gain coefficient is designed to correct this deviation, making the subsequent ambient light measurement more accurate; the standard illuminance is generated by high-precision equipment in a completely dark room environment. Its role is to provide consistent reference light for all screen angles, ensuring that the initial current collected by different screen angles is under the same light condition, avoiding external light interference, and allowing the gain coefficient calculated subsequently to truly reflect the hardware differences.
[0025]
[0026] The real-time compensation module is configured to calculate the compensation local illuminance of the screen to be measured according to the real-time current of the screen angle and the gain coefficient when the screen to be measured is running; In the embodiment of the present application, the compensation local illuminance of the screen to be measured is calculated according to the real-time current of the screen angle and the gain coefficient, comprising: Periodically trigger the photodiode of the screen angle and collect the real-time current of the screen angle; The real-time current and the gain coefficient are multiplied to obtain the compensation local illuminance of the screen to be measured, wherein the calculation formula of the compensation local illuminance is as follows:
[0027] Specifically, when calculating the compensation local illuminance of the screen to be measured, in view of the measurement deviation of the layered light path separation-guide-integrated cover plate, which has different waveguide path lengths, the photodiode of the screen angle is first triggered periodically to make the photodiode work continuously and regularly, and then the real-time current of each screen angle under the actual ambient light is collected; the real-time current and the gain coefficient corresponding to the screen angle calculated by the standard illuminance and the initial current are multiplied to correct the real-time current deviation caused by the difference in waveguide path length, thereby obtaining the compensation local illuminance of each screen angle of the screen to be measured.
[0028] Overall, in view of the technical problems of the existing open hole or frame type ambient light sensor, such as destroying the appearance, being easily blocked and being affected by self-luminous crosstalk, and the characteristics of the LSSC cover plate of the present application, which realizes zero pixel blocking but brings about the measurement deviation of different waveguide path lengths, the real-time current is collected periodically and corrected by the gain coefficient, eliminating the illumination measurement deviation caused by the hardware structure, providing a reliable basis for subsequent screen brightness adaptive adjustment based on accurate ambient light data, retaining the advantages of the LSSC cover plate and solving the new measurement deviation problem, and ensuring the accuracy of brightness adjustment and the effectiveness of ambient light collection.
[0029] an average illuminance calculation module configured to calculate the average illuminance according to the waveguide physical length of the screen angle and the compensated local illuminance; In an embodiment of the present application, the average illuminance is calculated according to the waveguide physical length of the screen angle and the compensated local illuminance, comprising: grouping the screen angles according to the waveguide physical length, and calculating the difference rate of the two groups; In an embodiment of the present application, the screen angles are grouped according to the waveguide physical length, and the difference rate of the two groups is calculated, comprising: If the waveguide physical length of the screen angle does not exceed a preset length threshold, the waveguide physical length is classified into a short waveguide group, otherwise, the waveguide physical length is classified into a long waveguide group; calculating the weight of the screen angle according to the waveguide physical length, wherein the calculation formula of the weight is as follows:
[0030] For the short waveguide group and the long waveguide group, the compensated local illuminance is weighted and averaged according to the weight, and the short waveguide group mean value and the long waveguide group mean value are obtained respectively; calculating the difference rate of the two groups according to the short waveguide group mean value and the long waveguide group mean value, wherein the calculation formula of the difference rate is as follows:
[0031] Specifically, when grouping the screen angles according to the waveguide physical length and calculating the difference rate of the two groups, because the hierarchical light path separation-guide integrated cover plate used in the present application has the characteristic that the waveguide paths are of different lengths, first, a preset length threshold is set, and the waveguide physical length of each screen angle is compared with the threshold. The screen angles whose waveguide physical length does not exceed the threshold are classified into a short waveguide group, and the screen angles whose waveguide physical length exceeds the threshold are classified into a long waveguide group. Then, the weight of each screen angle is calculated according to the waveguide physical length. The shorter the waveguide physical length, the greater the weight, so as to reflect the influence of the waveguide length on the subsequent calculation. Then, for the short waveguide group and the long waveguide group, the compensated local illuminance of each screen angle is weighted and averaged according to the calculated weight, to obtain the mean value of the short waveguide group and the mean value of the long waveguide group. Finally, by comparing the mean value of the short waveguide group and the mean value of the long waveguide group, the difference rate of the two groups is calculated, so as to quantify the illuminance difference between the two groups caused by the different waveguide physical lengths, and provide a basis for subsequent compensation or adjustment based on the difference. The whole process is carried out around the feature of the LSSC cover plate waveguide path difference, aiming to accurately handle the measurement deviation caused by the hardware structure.
[0032] Specifically, the waveguide physical length refers to the actual propagation path length of ambient light from the micro-prism incident end to the corner photodiode in the LSSC cover plate. Since the cover plate needs to achieve pixel zero occlusion, the waveguide path needs to bypass the display pixel area, resulting in differences in waveguide physical length at different screen corners, such as the waveguide paths at the four corners of the screen may be different in length. The preset length threshold is a critical value determined in advance through experimental calibration or simulation calculation, which is used to distinguish between short waveguide groups and long waveguide groups. Its role is to classify screen corners by waveguide physical length, so that subsequent difference rate calculation focuses on the measurement deviation caused by the difference in path length. The short waveguide group / long waveguide group is a grouping of screen corners according to whether the waveguide physical length exceeds the preset length threshold. The short waveguide group represents screen corners with short waveguide paths and small light loss. The long waveguide group represents screen corners with long waveguide paths and large light loss. The purpose of grouping is to separate hardware differences to facilitate quantification of the impact of different path lengths on ambient light collection. The weight is used to measure the degree of influence of each screen corner on ambient light collection due to the difference in waveguide physical length. Since the longer the waveguide path, the more obvious the attenuation of light in the propagation process, the greater the deviation between the light intensity detected by the photodiode and the actual ambient light intensity. The shorter the waveguide path, the smaller the light attenuation, and the smaller the detection deviation. In designing the weight, the shorter the waveguide physical length, the greater the weight; the longer the waveguide physical length, the smaller the weight. In subsequent calculations, screen corners with short waveguide paths and small light attenuation have a larger proportion in the overall result, and screen corners with long waveguide paths and large light attenuation have a smaller proportion, so that the final calculation result more accurately reflects the true ambient light intensity and eliminates the measurement deviation caused by the difference in waveguide path.
[0033] If the difference rate exceeds the preset difference threshold, select the low difference group in the two groups, and perform weighted averaging on the compensation local illuminance according to the weight of the low difference group to obtain the average illuminance in the low difference group. Specifically, when the difference rate exceeds the preset difference threshold, the low difference group in the short waveguide group and the long waveguide group is selected, the weight and the compensation local illuminance of each screen corner in the group are extracted, the compensation local illuminance of each screen corner is multiplied by the corresponding weight and summed, and then the weight sum is normalized to obtain the average illuminance of the low difference group, which is used to avoid the interference of path deviation in the high difference group and accurately obtain the local reliable illuminance data.
[0034] If the difference rate does not exceed the preset difference threshold, the compensation local illuminance is weighted and averaged according to the weight of all screen corners to obtain the average illuminance of the screen to be measured.
[0035] Specifically, when the difference rate does not exceed the preset difference threshold, the weight of all screen corners of the to-be-tested screen and the compensated local illuminance are collected, the total weighted contribution value is obtained by multiplying the compensated local illuminance of each screen corner by the weight, and then the average illuminance of the to-be-tested screen is obtained by normalizing the sum of the weights of all screen corners, which is used to provide accurate ambient light data for adaptive brightness adjustment.
[0036] Specifically, when the compensated local illuminance is processed according to the difference rate to calculate the average illuminance, first, the size relationship between the difference rate calculated in the previous step and the preset difference threshold is judged. If the difference rate exceeds the preset difference threshold, it indicates that the illuminance deviation caused by the difference in the physical length of the waveguide in the short waveguide group and the long waveguide group is relatively significant. At this time, the low difference group is selected from the two groups, that is, the group in which the physical length of the waveguide is relatively closer and the illuminance difference is smaller. That is, if , the short waveguide group is selected, otherwise the long waveguide group is selected. The weight corresponding to each screen corner in the low difference group is used to carry out weighted average operation on the compensated local illuminance in the group, and the average illuminance in the low difference group is integrated by giving different screen corners reasonable weight proportion, so as to avoid the influence of the large deviation caused by the high difference group. If the difference rate does not exceed the preset difference threshold, it indicates that the illuminance deviation caused by the difference in the physical length of the waveguide in the two groups is within an acceptable range. At this time, the weight corresponding to each screen corner is used to carry out weighted average operation on all the compensated local illuminance, and the influence degree of each screen corner is comprehensively considered, and then the average illuminance of the whole to-be-tested screen is calculated, so that the average illuminance can be accurately and reasonably calculated under different difference rates, and reliable basis is provided for subsequent screen brightness adaptive adjustment. The whole process is around the LSSC cover plate waveguide path difference characteristics of the present application, and the illuminance measurement deviation problem caused by the hardware structure is processed specifically.
[0037] The directional compensation module is used for judging whether to compensate the average illuminance according to the compensated local illuminance. In the embodiments of the present application, whether to compensate the average illuminance according to the compensated local illuminance includes: The x-axis group illuminance of the to-be-tested screen is calculated according to the compensated local illuminance of the upper left and lower left screen corners. The y-axis group illuminance of the to-be-tested screen is calculated according to the compensated local illuminance of the upper right and lower right screen corners.
[0038] The x-axis group illuminance and the y-axis group illuminance are the sum of the illuminance calculated according to the screen space dimension. The x-axis group integrates the compensated local illuminance of the upper left and lower left screen corners, and reflects the horizontal direction light intensity. The y-axis group integrates the compensated local illuminance of the upper right and lower right screen corners, and reflects the vertical direction light intensity.
[0039]
[0040] The backlight driving module is used for driving the backlight module according to the average illumination.
[0041] In the embodiment of the present application, the backlight module is driven according to the average illumination, comprising: The linear constant and the offset calibrated at factory are acquired; The average illumination is substituted into the hardware driving mapping formula to obtain the original brightness control signal, wherein the hardware driving mapping formula is as follows:
[0042] The original brightness control signal is limited in the range of 0-1 and converted into the pulse width modulation duty cycle; The duty cycle is written into the register of the backlight module to drive the backlight module to adjust the luminous brightness.
[0043] Specifically, when the operation of driving the backlight module according to the average illumination is performed, firstly, the linear constant and the offset calibrated at factory of the backlight module are acquired, the two parameters are determined in advance based on the hardware characteristics during the production of the module, and are used to establish the correlation between the illumination and the brightness control signal; then, the average illumination calculated in the early stage is substituted into the hardware driving mapping formula, the average illumination representing the ambient light intensity is converted into the original brightness control signal through the formula operation, so as to determine the brightness driving basic instruction that the backlight module should theoretically output; thereafter, considering the actual executable range of the hardware driving, the original brightness control signal is limited in the range of 0 to 1, so as to avoid that the signal exceeds the response range of the module, and the signal is further converted into the pulse width modulation duty cycle, the pulse width modulation duty cycle can accurately control the light-emitting time length of the backlight module in unit time; finally, the converted duty cycle is written into the register of the backlight module, and the register is used to transmit the instruction, so as to drive the backlight module to adjust the luminous brightness according to the duty cycle, so as to realize the effect of adaptively adjusting the screen backlight according to the ambient average illumination, the whole process is carried out around the accurate correlation between the ambient illumination and the backlight brightness and the adaptation of the hardware driving characteristics, so as to guarantee the accuracy and stability of the screen brightness adjustment.
[0044] In order to solve the above problems, the present application further provides a screen brightness adaptive adjustment method based on ambient light sensing, comprising: S1, using a standard illumination to cover the effective area of the to-be-tested screen, and synchronously collecting the initial current of each screen corner in the to-be-tested screen, and calculating the gain coefficient of the screen corner; S2, when the to-be-tested screen is running, calculating the compensation local illumination of the to-be-tested screen according to the real-time current of the screen corner and the gain coefficient; S3, calculating the average illumination according to the waveguide physical length of the screen corner and the compensation local illumination; S4, judging whether to compensate the average illumination according to the compensation local illumination; S5, driving the backlight module according to the average illumination.
[0045] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent substitutions or changes according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.
Claims
1. A screen brightness adaptive adjustment system based on ambient light sensing, characterized in that, include: The illuminance calibration module is used to cover the effective area of the screen under test with standard illuminance, and simultaneously collect the initial current of each screen corner in the screen under test, and calculate the gain coefficient of the screen corner. The real-time compensation module is used to calculate the compensated local illuminance of the screen under test based on the real-time current and gain coefficient of the screen corner when the screen under test is running. The average illuminance calculation module is used to calculate the average illuminance based on the waveguide physical length of the screen corner and the compensated local illuminance. The directional compensation module is used to determine whether to compensate for the average illuminance based on the local illuminance. A backlight driver module is used to drive the backlight module according to the average illuminance.
2. The screen brightness adaptive adjustment system based on ambient light sensing according to claim 1, characterized in that, The effective area of the screen under test is covered using standard illuminance, and the initial current of each corner of the screen is collected simultaneously, including: Construct a completely dark room environment for the screen to be tested; In a completely darkroom testing environment, a uniform standard illuminance is generated in the completely darkroom environment using a high-precision lighting device; The initial current under standard illumination is synchronously collected using photodiodes at the corner of the screen.
3. The screen brightness adaptive adjustment system based on ambient light sensing according to claim 1, characterized in that, Calculate the gain coefficient for the screen corner, including: Based on the linear relationship between standard illuminance and initial current, the gain coefficient of the screen angle is calculated. The formula for calculating the gain coefficient is as follows:
4. The screen brightness adaptive adjustment system based on ambient light sensing according to claim 1, characterized in that, The compensated local illuminance of the screen under test is calculated based on the real-time current and gain coefficient at the screen corner, including: The photodiode at the corner of the screen is periodically triggered, and the real-time current at the corner of the screen is collected. The compensated local illuminance of the screen under test is obtained by multiplying the real-time current and the gain coefficient.
5. The screen brightness adaptive adjustment system based on ambient light sensing according to claim 1, characterized in that, The average illuminance is calculated based on the waveguide physical length at the screen corner and the compensated local illuminance, including: The screen angles are grouped according to the waveguide physical length, and the difference rate between the two groups is calculated. If the difference rate exceeds the preset difference threshold, select the low difference group from the two groups, and perform a weighted average of the compensated local illuminance according to the weight of the low difference group to obtain the average illuminance in the low difference group. If the difference rate does not exceed the preset difference threshold, the compensated local illuminance is weighted and averaged according to the weight of all screen corners to obtain the average illuminance of the screen under test.
6. The screen brightness adaptive adjustment system based on ambient light sensing according to claim 5, characterized in that, The screen angles are grouped according to the waveguide physical length, and the difference rate between the two groups is calculated, including: If the physical length of the waveguide at the corner of the screen does not exceed the preset length threshold, the physical length of the waveguide is classified as a short waveguide group; otherwise, the physical length of the waveguide is classified as a long waveguide group. The weight of the screen angle is calculated based on the physical length of the waveguide; For the short waveguide group and the long waveguide group, the local illuminance compensation is weighted and averaged according to the weights to obtain the mean values for the short waveguide group and the long waveguide group, respectively. The difference rate between the two groups is calculated based on the mean values of the short waveguide group and the long waveguide group.
7. The screen brightness adaptive adjustment system based on ambient light sensing according to claim 1, characterized in that, Determining whether to compensate for average illuminance based on compensated local illuminance includes: The x-axis illuminance of the screen under test is calculated based on the compensated local illuminance at the top left and bottom left corners of the screen. The y-axis illuminance of the screen under test is calculated based on the compensated local illuminance of the upper right and lower right corners of the screen.
8. The screen brightness adaptive adjustment system based on ambient light sensing according to claim 1, characterized in that, The backlight module is driven based on average illuminance, including: Obtain the factory-calibrated linear constant and offset; Substituting the average illuminance into the hardware driver mapping formula yields the original brightness control signal; The original brightness control signal is limited to the range of 0-1 and converted into a pulse width modulation duty cycle; Write the duty cycle into the register of the backlight module to drive the backlight module to adjust the brightness.
9. A screen brightness adaptive adjustment method based on ambient light sensing, characterized in that, The method includes: S1. Cover the effective area of the screen under test with standard illuminance, and simultaneously collect the initial current of each screen corner in the screen under test, and calculate the gain coefficient of the screen corner. S2. When the screen under test is running, calculate the compensated local illuminance of the screen under test based on the real-time current and gain coefficient of the screen corner. S3. Calculate the average illuminance based on the waveguide physical length at the screen angle and the compensated local illuminance; S4. Determine whether to compensate for the average illuminance based on the compensated local illuminance. S5. Drive the backlight module based on the average illuminance.