Reflection sampling method, system and device of electronic paper and electronic paper
By combining two sampling methods with ambient reference light, interference factors in the electronic paper reflection sampling are removed, solving the problem of unstable display of electronic paper in low light environment, and achieving more accurate front light control and reduced flicker.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ANHUI YUTU TECH CO LTD
- Filing Date
- 2026-03-18
- Publication Date
- 2026-05-12
AI Technical Summary
Electronic paper displays poorly in low light or dark environments. Existing feedback control methods are affected by direct front light and changes in ambient light, leading to closed-loop instability and misjudgment.
A two-sampling method was used to control the front light zone to emit light in high and low brightness states respectively. Combined with the ambient reference light, outliers were removed and the reflection characterization value was determined.
It improves the accuracy of front light control, ensuring stable display of electronic paper in low-light environments and reducing flicker and power consumption.
Smart Images
Figure CN122016724A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optical signal processing, and in particular to a reflection sampling method, system, device, and electronic paper for electronic paper. Background Technology
[0002] Electronic paper is a reflective display technology that relies on reflecting ambient light to form an image, rather than actively emitting light. Since electronic paper itself lacks the ability to emit light, it cannot display properly in low light or dark environments. Therefore, it requires a front light source. The light emitted from the front light shines on the surface of the electronic paper, is reflected by particles, and is received by the human eye, enabling display in low light conditions. To achieve the desired display effect, the front light needs to be controlled based on the feedback from the electronic paper. However, the sensor readings that collect this feedback are often affected by factors such as direct front light or changes in ambient light, leading to closed-loop instability or misjudgments, and consequently, inaccurate control of the front light. Summary of the Invention
[0003] The purpose of this invention is to provide a reflection sampling method, system, device, and electronic paper for electronic paper. Through two sampling steps, interference factors in the front light zone are determined. Combined with ambient reference light, environmental interference factors are removed, taking into account the influence of factors such as direct front light or changes in ambient light. Outliers outside the range are removed, resulting in more accurate reflection characterization values and thus more precise control over the front light.
[0004] To solve the above-mentioned technical problems, the present invention provides a reflection sampling method for electronic paper, comprising:
[0005] Determine the electronic paper area to be tested and the corresponding front light partition of the electronic paper area to be tested;
[0006] The front light partition is controlled to emit light to the corresponding electronic paper area under test in a first driving state and a second driving state, respectively. The brightness of the front light partition in the first driving state is higher than that of the front light partition in the second driving state.
[0007] The reflection characterization value is determined based on the light reflected from the electronic paper area under test, the ambient reference light, and the driving parameters of the front light partition under the first driving state and the second driving state.
[0008] When the light reflected by the electronic paper region under test is within the corresponding value range in the first driving state and the second driving state, the reflection characterization value is output.
[0009] On the other hand, determining the electronic paper area to be tested and the corresponding front light partition of the electronic paper area to be tested includes:
[0010] Light up any front light zone, and determine the electronic paper area with the greatest brightness change during the lighting process of the front light zone as the electronic paper area to be tested, and take the lit front light zone as the front light zone corresponding to the electronic paper area to be tested.
[0011] Alternatively, the area of the electronic paper to be tested and the corresponding front light zone can be determined according to the positional relationship between the electronic paper and the front light zone.
[0012] On the other hand, after controlling the front light partition to emit light to the corresponding electronic paper area under test in the first driving state and the second driving state respectively, the method further includes:
[0013] Set the initial sampling period;
[0014] Adjust the initial sampling period until the frequency of light change reflected from the electronic paper area under test is lower than or equal to the preset frequency.
[0015] The electronic paper area to be tested is sampled according to the adjusted initial sampling period;
[0016] The average value of the light reflected from the electronic paper area under test collected under multiple adjusted initial sampling periods is taken, and the average value is used as the light reflected from the electronic paper area under test in the first driving state and the second driving state.
[0017] On the other hand, determining the reflection characterization value based on the light reflected from the electronic paper region under test, the ambient reference light, and the driving parameters of the front light partition in the first driving state and the second driving state includes:
[0018] Determine the light reflected by the electronic paper region under test in the first driving state. and the light reflected from the electronic paper area under test in the second driving state ;
[0019] The difference value of the front optical partition is determined, and the expression for the difference value is as follows: ;
[0020] The reflection characterization value is determined based on the difference value, the ambient reference light, and the driving parameters of the front optical partition. The expression for the reflection characterization value is as follows: ;
[0021] in, This is the reflection characterization value. For mapping functions, The difference value, For compensation coefficient, For environmental reference values, These are the driving parameters for the front optical partition.
[0022] On the other hand, when the light reflected by the electronic paper region under test is within the corresponding value range in the first driving state and the second driving state, the reflection characterization value is output, including:
[0023] Determine whether the difference between the light reflected from the electronic paper area under test in the first driving state and the second driving state is within the corresponding value range;
[0024] If so, proceed to the step of outputting the reflection characterization value;
[0025] If the difference value is greater than the maximum value of the range, then reduce the brightness of the front light zone corresponding to the first driving state or the second driving state.
[0026] If the difference value is less than the minimum value of the range and is positive, then the brightness of the front light zone corresponding to the first driving state or the second driving state is increased.
[0027] If the difference value is negative, then return to the step of controlling the front light partition to emit light to the corresponding electronic paper area under test in the first driving state and the second driving state respectively.
[0028] On the other hand, after determining whether the difference between the light reflected from the electronic paper region under test in the first driving state and the second driving state is within the corresponding value range, the method further includes:
[0029] Determine the mean and deviation of the difference values over multiple sampling periods;
[0030] The outliers in the difference values are determined based on the mean and the deviation.
[0031] Remove the outliers;
[0032] Determining whether the difference in light reflected from the electronic paper region under test between the first driving state and the second driving state is within a corresponding value range includes:
[0033] The system then determines whether the difference value after removing the outliers is within the corresponding range.
[0034] On the other hand, controlling the front light partitions to emit light onto the corresponding electronic paper areas under test in a first driving state and a second driving state respectively includes:
[0035] The output of each front optical zone is modulated, and the output brightness of the modulated front optical zone is... ;
[0036] in, Let be the output brightness of the front optical partition after modulation at time t. For the expected brightness, This is the jitter coefficient. Let be the jitter sequence at time t;
[0037] Before determining the reflection characterization value based on the light reflected from the electronic paper area under test, the ambient reference light, and the driving parameters of the front light partition in the first driving state and the second driving state, the method further includes:
[0038] The light reflected from the area of the electronic paper under test is demodulated, and the demodulated light reflected from the area of the electronic paper under test is... ;
[0039] in, The light reflected from the area of the electronic paper under test after demodulation. Let t be the light reflected from the area of the electronic paper under test collected at time t.
[0040] To address the aforementioned technical problems, the present invention also provides a reflective sampling system for electronic paper, comprising:
[0041] The region determination unit is used to determine the electronic paper region to be tested and the front light partition corresponding to the electronic paper region to be tested.
[0042] The light-emitting driving unit is used to control the front light partition to emit light to the corresponding electronic paper area under test in a first driving state and a second driving state, respectively. The brightness of the front light partition in the first driving state is higher than the brightness of the front light partition in the second driving state.
[0043] A reflection characterization value determination unit is used to determine the reflection characterization value based on the light reflected by the electronic paper area under test, the ambient reference light, and the driving parameters of the front light partition in the first driving state and the second driving state.
[0044] The output determination unit is used to output the reflection characterization value when the light reflected by the electronic paper area under test is within the corresponding value range in the first driving state and the second driving state.
[0045] To address the aforementioned technical problems, the present invention also provides a reflective sampling device for electronic paper, comprising:
[0046] Memory, used to store computer programs;
[0047] A processor is used to implement the steps of the above-described electronic paper reflection sampling method when executing the computer program.
[0048] To address the aforementioned technical problems, the present invention also provides an electronic paper, including the aforementioned electronic paper reflective sampling device.
[0049] This application provides a reflection sampling method, system, apparatus, and electronic paper for electronic paper, relating to the field of optical signal processing. The method includes determining the area of the electronic paper to be tested and the corresponding front light partition; controlling the front light partition to emit light into the corresponding area of the electronic paper to be tested in a first driving state and a second driving state, respectively; determining a reflection characterization value based on the light reflected from the area of the electronic paper to be tested, the ambient reference light, and the driving parameters of the front light partition in the first and second driving states; and outputting the reflection characterization value when the light reflected from the area of the electronic paper to be tested is within the corresponding value range in the first and second driving states. By sampling twice, interference factors in the front light partition are determined, and environmental interference factors are removed by combining the ambient reference light, taking into account factors such as direct front light or changes in ambient light. Outliers outside the value range are removed, resulting in a more accurate reflection characterization value and thus more accurate control of the front light. Attached Figure Description
[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0051] Figure 1 A flowchart of a reflection sampling method for electronic paper provided by the present invention;
[0052] Figure 2 This is a schematic diagram of the structure of a reflective sampling system for electronic paper provided by the present invention;
[0053] Figure 3 This is a schematic diagram of the structure of a reflective sampling device for electronic paper provided by the present invention. Detailed Implementation
[0054] The core of this invention is to provide a reflection sampling method, system, device, and electronic paper for electronic paper. Through two sampling steps, interference factors in the front light zone are determined. Combined with ambient reference light, environmental interference factors are removed, taking into account the influence of factors such as direct front light or changes in ambient light. Outliers outside the range are removed, resulting in more accurate reflection characterization values and thus more precise control over the front light.
[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.
[0056] Figure 1 A flowchart of a reflection sampling method for electronic paper provided by the present invention, the reflection sampling method for electronic paper comprising:
[0057] S11: Determine the electronic paper area to be tested and the corresponding front light partition of the electronic paper area to be tested;
[0058] Electronic paper uses a transparent front light and transparent optical sensor solution, which are stacked with the screen. The bottom layer is the electronic paper panel, and the two layers above can be interchanged. In general, from top to bottom, it is: front light layer - sensor layer - electronic paper panel, or sensor layer - front light layer - electronic paper panel.
[0059] Feedback from the front light control of e-paper requires sensor readings, but these readings are often overwhelmed by factors such as direct front light, optical path crosstalk, ambient light changes, and reflections within the cover plate, leading to closed-loop instability or misjudgments. Current e-paper front light control often relies on ambient light sensors or a small number of screen brightness sensors. However, when the front light is on, sensors near the screen are prone to receiving direct coupled light from the front light (the component that does not pass through screen reflection), crosstalk caused by internal reflections and scattering from the cover plate / adhesive layer, or rapid changes in ambient light. This makes it difficult to extract screen reflection characteristics, resulting in large control algorithm errors, flickering, and increased power consumption.
[0060] The front light partition is the area in the front light layer that illuminates the electronic paper. Since the electronic paper is divided into various regions, the front light layer is also divided into various regions. Each front light partition emits light for the corresponding area of the electronic paper to be tested. There may be multiple light-emitting devices in each front light partition.
[0061] This application first configures the sampling object and window, and determines the target illumination sub-unit / zone and its associated monitoring point set. The associated monitoring point is the sensing point that is most sensitive to the brightness change of a certain front light zone and can best represent the reflection effect of that zone. That is, the electronic paper area to be tested and the corresponding front light zone.
[0062] S12: Control the front light partition to emit light to the corresponding electronic paper area under test in the first driving state and the second driving state respectively. The brightness of the front light partition in the first driving state is higher than the brightness of the front light partition in the second driving state.
[0063] Within the same control cycle, at least two sampling operations must be performed at the same monitoring point:
[0064] Phase A (Front Light On / Specific Driver): Sampled to include ambient light + front light direct / crosstalk + screen reflection contribution.
[0065] Phase B (front light off / brightness reduction / reference drive): The sampled data mainly includes ambient light and background.
[0066] The only variable is the driving brightness of the front light zone. During the two emission processes, all conditions—including the area of the electronic paper under test, ambient light, and sensor status—remain consistent. This ensures that the difference in subsequent sampled values corresponds to the change in reflected light caused by the change in front light brightness, rather than other interfering factors. A combination of a high-brightness first driving state and a low-brightness second driving state, rather than simply on and off, is used. This retains the ability to differentially eliminate static interference such as ambient light and sensor dark current, while avoiding visible screen flicker caused by the front light being completely off, thus resolving the conflict between interference elimination and user experience. The emission and sampling of both driving states are completed within the same control cycle, avoiding issues such as sudden changes in ambient light across cycles and fluctuations in front light driving. This ensures that the two reflected light sampled values have effective comparative significance, providing a prerequisite for subsequent differential calculations to eliminate common-mode interference.
[0067] S13: Determine the reflection characterization value based on the light reflected from the electronic paper area under test, the ambient reference light, and the driving parameters of the front light partition in the first driving state and the second driving state.
[0068] By combining the reflected light sampling values from two driving states to eliminate fixed interferences such as ambient light and sensor dark current, introducing ambient reference light for compensation, and combining driving parameters to offset the influence of front light driving intensity, all interferences not related to the electronic paper itself, such as direct front light, crosstalk, ambient light, and driving parameters, are removed, and finally, a value that only reflects the true reflective characteristics of the electronic paper surface is obtained.
[0069] S14: When the light reflected from the electronic paper area under test is within the corresponding value range in the first driving state and the second driving state, output the reflection characterization value.
[0070] By determining the value range, abnormal reflected light sampling values caused by sensor saturation, random noise, sudden changes in ambient light, and front light crosstalk are intercepted, preventing these meaningless abnormal data from being input into the closed-loop control module. This avoids problems such as front light oscillation, flickering, and incorrect supplementary lighting. Data verification is performed before the reflection characterization value is output, intercepting invalid data in advance and reducing invalid calculations in the subsequent closed-loop control module.
[0071] This application provides a reflection sampling method for electronic paper, relating to the field of optical signal processing. The method includes determining the electronic paper region to be tested and the corresponding front light partition; controlling the front light partition to emit light into the corresponding electronic paper region in a first driving state and a second driving state, respectively; determining a reflection characterization value based on the light reflected from the electronic paper region under the first and second driving states, the ambient reference light, and the driving parameters of the front light partition; and outputting the reflection characterization value when the light reflected from the electronic paper region under the first and second driving states is within the corresponding value range. By sampling twice, interference factors in the front light partition are determined, and environmental interference factors are removed by combining the ambient reference light, taking into account factors such as direct front light or changes in ambient light. By removing outliers outside the value range, the final determined reflection characterization value is more accurate, leading to more accurate control of the front light.
[0072] Based on the above embodiments:
[0073] In some embodiments, determining the electronic paper region to be tested and the corresponding front light partition of the electronic paper region to be tested includes:
[0074] Light up any front light zone, and determine the electronic paper area with the greatest brightness change during the lighting process of the front light zone as the electronic paper area to be tested, and take the lit front light zone as the front light zone corresponding to the electronic paper area to be tested.
[0075] Alternatively, the area of the electronic paper to be tested and the corresponding front light zone can be determined according to the positional relationship between the electronic paper and the front light zone.
[0076] One by one, the front light zones of the electronic paper's accompanying front light module are illuminated (the remaining zones remain in a low-brightness / off state). Using the electronic paper's reflective light sensor, brightness change values are collected from all sensing points across the entire screen. The electronic paper area with the largest brightness change amplitude is selected and defined as the electronic paper area to be tested corresponding to that front light zone. This logic is used to complete a one-to-one matching of all front light zones and electronic paper areas, establishing a mapping relationship. Matching is based on actual brightness changes, and subsequent reflection sampling monitoring points are the optimal sensing points for that front light zone, effectively reducing front light crosstalk and interference from direct light on the sampling.
[0077] Alternatively, a preset positional mapping relationship can be established between the e-paper display area and the front light zone based on the light emission range of the front light zone, the display coordinates of the e-paper, and the sensor placement. This mapping relationship can then be directly invoked during subsequent testing, improving testing efficiency.
[0078] The two methods provided in this application can be selected according to actual needs, and the specific use cases are not limited here.
[0079] In some embodiments, after controlling the front light partitions to emit light to the corresponding electronic paper areas under test in a first driving state and a second driving state respectively, the method further includes:
[0080] Set the initial sampling period;
[0081] Adjust the initial sampling period until the frequency of light reflected from the electronic paper area under test is lower than or equal to the preset frequency.
[0082] The electronic paper area to be tested was sampled according to the adjusted initial sampling period;
[0083] The average value of the light reflected from the electronic paper area under test collected under multiple adjusted initial sampling periods is taken, and the average value is used as the light reflected from the electronic paper area under test in the first driving state and the second driving state.
[0084] Set a sampling window (e.g., sampling in a specific time slot within the refresh cycle or front light drive cycle) to reduce the impact of dynamic noise. The partitioning is based on the front light mode, typically using zoned driving, so the associated points automatically correspond to each real-world area of the front light. After determining the initial sampling period, you can begin collecting reflected light from the area of the electronic paper under test.
[0085] First, wait for the reading to stabilize. If the reading continues to fluctuate, increase the sampling window. A shorter window results in faster reading changes but more pronounced fluctuations; a longer window results in slower changes but less noise. Regarding the number of samples, multiple samples can be taken and the average value calculated to reduce the impact of noise.
[0086] Considering the random high-frequency noise inherent in the sensor itself, increasing the sampling period to reduce the sampling frequency and then averaging the sampling values from multiple periods can effectively filter out high-frequency noise and make the sampled values closer to the true intensity of reflected light.
[0087] In some embodiments, determining the reflection characterization value based on the light reflected from the electronic paper region under test, the ambient reference light, and the driving parameters of the front light partition in the first driving state and the second driving state includes:
[0088] Determine the light reflected from the area of the electronic paper under test in the first driving state. and the light reflected from the area of the electronic paper under test in the second driving state ;
[0089] The difference value of the front optical partition is determined by the expression for the difference value. ;
[0090] The reflection characterization value is determined based on the differential value, the ambient reference light, and the driving parameters of the front optical partition. The expression for the reflection characterization value is: ;
[0091] in, This is the reflection characterization value. For mapping functions, The difference value, For compensation coefficient, For environmental reference values, These are the driving parameters for the front optical partition.
[0092] Within the same control cycle, at least two sampling operations must be performed at the same monitoring point:
[0093] Phase A (front optical switch / specific drive): obtained by sampling (Includes ambient light + direct front light / crosstalk + screen reflection contribution); the sampled light includes the effects of the factors listed in parentheses.
[0094] Phase B (Front-off / Brightness Reduction / Reference Drive): Obtained by sampling (Mainly includes ambient light and background items);
[0095] Calculate the difference: , used to characterize the net contribution related to the front light.
[0096] Regarding phase A, or the first driving state, it refers to controlling the front light partition corresponding to the area of the electronic paper under test to emit light in the target working driving state within a preset sampling time slot. This state is the actual dimming working state of the front light partition, which can be in two forms to adapt to different control requirements. The first is front light on, where the front light partition is driven by the target brightness set by the user / closed-loop control to provide illumination for the normal display of the electronic paper. The second is specific driving, where the front light partition emits light with preset fixed driving parameters to avoid interference from the fluctuation of driving parameters in real-time dimming on the sampling.
[0097] Regarding phase B, the second driving state, it refers to controlling the front light zone under test to operate in a reference driving state with no effective illumination within another preset time slot of the same control cycle as phase A. This eliminates the contribution of effective front light emission to sampling. Specifically, it can take two forms to adapt to different control requirements. The first is front light off, where the entire front light module is turned off. The second is brightness reduction / reference driving, where the front light zone is driven at extremely low brightness, only offsetting the dark current of the sensor, with no actual illumination effect.
[0098] The two driving states directly isolate interference such as ambient light and direct front light through differential isolation, so that the subsequent reflection characterization value is only related to the actual reflection characteristics of the electronic paper, providing a stable feedback input for the front light closed-loop control.
[0099] In some embodiments, when the light reflected from the electronic paper region under test is within the corresponding value range in the first driving state and the second driving state, a reflection characterization value is output, including:
[0100] Determine whether the difference in the light reflected from the electronic paper area under test between the first driving state and the second driving state is within the corresponding range.
[0101] If so, proceed to the step of outputting the reflection characterization value;
[0102] If the difference value is greater than the maximum value in the range, the brightness of the front light zone corresponding to the first driving state or the second driving state will be reduced.
[0103] If the difference value is less than the minimum value in the range and is positive, then the brightness of the front light zone corresponding to the first driving state or the second driving state is increased.
[0104] If the difference value is negative, the process returns to the steps of controlling the front light partition to emit light to the corresponding electronic paper area under test in the first driving state and the second driving state, respectively.
[0105] The differential value is filtered / limited / detected (saturation detection, abrupt change detection), and a stable reflection characterization value is output for closed-loop use.
[0106] Monitoring is essentially about finding and fixing errors. You might encounter the following types of errors:
[0107] If the environment is too saturated or too dark, such as in an extremely bright or extremely dark environment, the difference value is worthless if it exceeds the measurement range in either direction.
[0108] Handling strategy:
[0109] Saturation (excessive difference value): Reduce the front light, shorten the integration time, or mark the point as invalid;
[0110] Too dark (difference value too small): Increase integration time, increase front light, or reduce weights;
[0111] Difference sign anomaly:
[0112] Theoretically, the difference value should be ≥0 (the brighter the light, the stronger the sensing).
[0113] If the difference is less than or equal to the threshold:
[0114] Potential problems include: misaligned sampling windows, drastic changes in ambient light between sampling sessions, or high sensor noise / jitter.
[0115] Handling strategy:
[0116] Discard the current difference value or resample once (maximum 1-2 retries). The system can handle potential errors to some extent.
[0117] In some embodiments, after determining whether the difference between the light reflected from the electronic paper region under test in the first driving state and the second driving state is within the corresponding value range, the method further includes:
[0118] Determine the mean and bias of the difference values across multiple sampling periods;
[0119] Identify outliers in the difference values based on the mean and deviation;
[0120] Remove outliers;
[0121] Determine whether the difference in light reflected from the electronic paper area under test between the first driving state and the second driving state is within the corresponding value range, including:
[0122] The next step is to determine whether the difference value after removing outliers is within the corresponding range.
[0123] The difference values of related points in the same partition should be roughly the same. They can be different, but not too exaggerated. Therefore, the mean and deviation are calculated.
[0124] The difference values from N consecutive and valid sampling periods are selected as the statistical sample. The mean reflects the central trend of the difference values across multiple periods and serves as the benchmark for identifying outliers; the arithmetic mean is preferred. The deviation reflects the dispersion of the difference values across multiple periods and is the core indicator for determining the degree of outliers; the standard deviation is preferred in the electronic paper scenario. The general 3σ principle can be used to identify outliers; outliers with excessively large deviations are removed.
[0125] In some embodiments, controlling the front light partitions to emit light onto the corresponding electronic paper areas under test in a first driving state and a second driving state respectively includes:
[0126] The output of each front optical zone is modulated, and the output brightness of the modulated front optical zone is... ;
[0127] in, Let be the output brightness of the front optical partition after modulation at time t. For the expected brightness, This is the jitter coefficient. Let be the jitter sequence at time t;
[0128] Before determining the reflection characterization value based on the light reflected from the electronic paper region under test, the ambient reference light, and the driving parameters of the front light partition in the first and second driving states, the process also includes:
[0129] The light reflected from the tested electronic paper area is demodulated, and the demodulated light reflected from the tested electronic paper area is... ;
[0130] in, The light reflected from the area of the electronic paper under test after demodulation. Let t be the light reflected from the area of the electronic paper under test, collected at time t.
[0131] The difference mentioned above It can eliminate ambient light, but its effectiveness is limited in certain situations. For example, when multiple zones are lit simultaneously, the local area is affected by other zones; or when the environment changes rapidly, such as in a constantly flickering lighting environment like a train passing through a fence, the differential values may not be reliable.
[0132] In this case, modulation-synchronous sampling-demodulation (phase-locked / correlated) is required to further suppress direct light and crosstalk, allowing the sensor to ignore other light and noise.
[0133] To improve separability under complex crosstalk conditions, identifiable modulation / coding is applied to the front optical drive. , It's a self-generated, regular sequence. For example, the simplest way is to generate a square wave; as long as it's relatively regular and identifiable, it's fine. A special sequence is added to each front optical zone, so the light reflected from the electronic paper area under test corresponding to each front optical zone has a corresponding demodulation method. This eliminates interference between the various front optical zones.
[0134] Front light drive: , That's the desired brightness. It is a coefficient that determines how pronounced the added jitter sequence is. It is a jitter sequence, which is essentially a very small jitter signal superimposed on the required brightness of the front light zone, with a unique rhythm.
[0135] Sensing sampling is For reference, Perform synchronous demodulation / correlation, ultimately .
[0136] Figure 2 This is a schematic diagram of the structure of a reflective sampling system for electronic paper provided by the present invention. The reflective sampling system for electronic paper includes:
[0137] The region determination unit 21 is used to determine the electronic paper region to be tested and the front light partition corresponding to the electronic paper region to be tested.
[0138] The light-emitting driving unit 22 is used to control the front light partition to emit light to the corresponding electronic paper area under test in a first driving state and a second driving state respectively. The brightness of the front light partition in the first driving state is higher than the brightness of the front light partition in the second driving state.
[0139] The reflection characterization value determination unit 23 is used to determine the reflection characterization value based on the light reflected by the electronic paper area under test, the ambient reference light, and the driving parameters of the front light partition in the first driving state and the second driving state.
[0140] The output determination unit 24 is used to output a reflection characterization value when the light reflected by the electronic paper area under test is within the corresponding value range in the first driving state and the second driving state.
[0141] Based on the above embodiments:
[0142] The region determination unit 21 is specifically used to light up any front light zone, determine the electronic paper region with the greatest brightness change during the lighting process of the front light zone as the electronic paper region to be tested, and take the lit front light zone as the front light zone corresponding to the electronic paper region to be tested.
[0143] Alternatively, the area of the electronic paper to be tested and the corresponding front light zone can be determined according to the positional relationship between the electronic paper and the front light zone.
[0144] Also includes:
[0145] The sampling period setting unit is used to set the initial sampling period;
[0146] The sampling period adjustment unit is used to adjust the initial sampling period until the frequency of light change reflected from the electronic paper area under test is lower than or equal to the preset frequency.
[0147] The sampling unit is used to sample the electronic paper area to be tested according to the adjusted initial sampling period;
[0148] The average value calculation unit is used to average the light reflected from the electronic paper area under test collected under multiple adjusted initial sampling periods, and use the average value as the light reflected from the electronic paper area under test in the first driving state and the second driving state.
[0149] The reflection characterization value determination unit 23 is specifically used to determine the light reflected by the electronic paper region under test in the first driving state. and the light reflected from the area of the electronic paper under test in the second driving state ;
[0150] The difference value of the front optical partition is determined by the expression for the difference value. ;
[0151] The reflection characterization value is determined based on the differential value, the ambient reference light, and the driving parameters of the front optical partition. The expression for the reflection characterization value is: ;
[0152] in, This is the reflection characterization value. For mapping functions, The difference value, For compensation coefficient, For environmental reference values, These are the driving parameters for the front optical partition.
[0153] The output determination unit 24 is specifically used to determine whether the difference value of the light reflected by the electronic paper area under test in the first driving state and the second driving state is within the corresponding value range.
[0154] If so, proceed to the step of outputting the reflection characterization value;
[0155] If the difference value is greater than the maximum value in the range, the brightness of the front light zone corresponding to the first driving state or the second driving state will be reduced.
[0156] If the difference value is less than the minimum value in the range and is positive, then the brightness of the front light zone corresponding to the first driving state or the second driving state is increased.
[0157] If the difference value is negative, the process returns to the steps of controlling the front light partition to emit light to the corresponding electronic paper area under test in the first driving state and the second driving state, respectively.
[0158] The mean and deviation determination unit is used to determine the mean and deviation of the difference values over multiple sampling periods;
[0159] Outlier identification unit, used to identify outliers in the difference values based on the mean and bias;
[0160] The elimination unit is used to remove outliers;
[0161] Output decision unit 24 is specifically used to determine whether the difference value after removing outliers is within the corresponding value range.
[0162] Modulation unit 3 is used to modulate the output of each front optical zone, and the output brightness of the modulated front optical zone is... ;
[0163] in, Let be the output brightness of the front optical partition after modulation at time t. For the expected brightness, This is the jitter coefficient. Let be the jitter sequence at time t;
[0164] The demodulation unit is used to demodulate the light reflected from the area of the electronic paper under test. The demodulated light reflected from the area of the electronic paper under test is... ;
[0165] in, The light reflected from the area of the electronic paper under test after demodulation. Let t be the light reflected from the area of the electronic paper under test, collected at time t.
[0166] Figure 3 This is a schematic diagram of the structure of a reflective sampling device for electronic paper provided by the present invention. The reflective sampling device for electronic paper includes:
[0167] Memory 31 is used to store computer programs;
[0168] The processor 32 is used to implement the steps of the above-described electronic paper reflection sampling method when executing a computer program.
[0169] The description of the reflective sampling device for electronic paper provided in this application is given in the above embodiments and will not be repeated here.
[0170] The present invention also provides an electronic paper, including the above-described electronic paper reflective sampling device.
[0171] The description of the electronic paper provided in this application is based on the above embodiments and will not be repeated here.
[0172] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0173] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.
[0174] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A reflective sampling method for electronic paper, characterized in that, include: Determine the electronic paper area to be tested and the corresponding front light partition of the electronic paper area to be tested; The front light partition is controlled to emit light to the corresponding electronic paper area under test in a first driving state and a second driving state, respectively. The brightness of the front light partition in the first driving state is higher than that of the front light partition in the second driving state. The reflection characterization value is determined based on the light reflected from the electronic paper area under test, the ambient reference light, and the driving parameters of the front light partition under the first driving state and the second driving state. When the light reflected by the electronic paper region under test is within the corresponding value range in the first driving state and the second driving state, the reflection characterization value is output.
2. The electronic paper reflection sampling method as described in claim 1, characterized in that, Determining the electronic paper region to be tested and the corresponding front light partition of the electronic paper region to be tested includes: Light up any front light zone, and determine the electronic paper area with the greatest brightness change during the lighting process of the front light zone as the electronic paper area to be tested, and take the lit front light zone as the front light zone corresponding to the electronic paper area to be tested. Alternatively, the area of the electronic paper to be tested and the corresponding front light zone can be determined according to the positional relationship between the electronic paper and the front light zone.
3. The electronic paper reflection sampling method as described in claim 1, characterized in that, After controlling the front light partitions to emit light onto the corresponding electronic paper areas under test in a first driving state and a second driving state respectively, the method further includes: Set the initial sampling period; Adjust the initial sampling period until the frequency of light change reflected from the electronic paper area under test is lower than or equal to the preset frequency. The electronic paper area to be tested is sampled according to the adjusted initial sampling period; The average value of the light reflected from the electronic paper area under test collected under multiple adjusted initial sampling periods is taken, and the average value is used as the light reflected from the electronic paper area under test in the first driving state and the second driving state.
4. The electronic paper reflection sampling method as described in claim 1, characterized in that, The reflection characterization value is determined based on the light reflected from the electronic paper area under test, the ambient reference light, and the driving parameters of the front light partition under the first driving state and the second driving state, including: Determine the light reflected by the electronic paper region under test in the first driving state. and the light reflected from the electronic paper area under test in the second driving state ; The difference value of the front optical partition is determined, and the expression for the difference value is as follows: ; The reflection characterization value is determined based on the difference value, the ambient reference light, and the driving parameters of the front optical partition. The expression for the reflection characterization value is as follows: ; in, This is the reflection characterization value. For mapping functions, The difference value, For compensation coefficient, For environmental reference values, These are the driving parameters for the front optical partition.
5. The electronic paper reflection sampling method as described in claim 1, characterized in that, When the light reflected from the electronic paper area under test is within the corresponding value range in the first driving state and the second driving state, the reflection characterization value is output, including: Determine whether the difference between the light reflected from the electronic paper area under test in the first driving state and the second driving state is within the corresponding value range; If so, proceed to the step of outputting the reflection characterization value; If the difference value is greater than the maximum value of the range, then reduce the brightness of the front light zone corresponding to the first driving state or the second driving state. If the difference value is less than the minimum value of the range and is positive, then the brightness of the front light zone corresponding to the first driving state or the second driving state is increased. If the difference value is negative, then return to the step of controlling the front light partition to emit light to the corresponding electronic paper area under test in the first driving state and the second driving state respectively.
6. The electronic paper reflection sampling method as described in claim 5, characterized in that, After determining whether the difference between the light reflected from the electronic paper region under test in the first driving state and the second driving state is within the corresponding value range, the method further includes: Determine the mean and deviation of the difference values over multiple sampling periods; The outliers in the difference values are determined based on the mean and the deviation. Remove the outliers; Determining whether the difference in light reflected from the electronic paper region under test between the first driving state and the second driving state is within a corresponding value range includes: The system then determines whether the difference value after removing the outliers is within the corresponding range.
7. The electronic paper reflection sampling method according to any one of claims 1 to 6, characterized in that, Controlling the front light partitions to emit light onto the corresponding electronic paper areas under test in a first driving state and a second driving state respectively includes: The output of each front optical zone is modulated, and the output brightness of the modulated front optical zone is... ; in, Let be the output brightness of the front optical partition after modulation at time t. For the expected brightness, This is the jitter coefficient. Let be the jitter sequence at time t; Before determining the reflection characterization value based on the light reflected from the electronic paper area under test, the ambient reference light, and the driving parameters of the front light partition in the first driving state and the second driving state, the method further includes: The light reflected from the area of the electronic paper under test is demodulated, and the demodulated light reflected from the area of the electronic paper under test is... ; in, The light reflected from the area of the electronic paper under test after demodulation. Let t be the light reflected from the area of the electronic paper under test collected at time t.
8. A reflective sampling system for electronic paper, characterized in that, include: The region determination unit is used to determine the electronic paper region to be tested and the front light partition corresponding to the electronic paper region to be tested. The light-emitting driving unit is used to control the front light partition to emit light to the corresponding electronic paper area under test in a first driving state and a second driving state, respectively. The brightness of the front light partition in the first driving state is higher than the brightness of the front light partition in the second driving state. A reflection characterization value determination unit is used to determine the reflection characterization value based on the light reflected by the electronic paper area under test, the ambient reference light, and the driving parameters of the front light partition in the first driving state and the second driving state. The output determination unit is used to output the reflection characterization value when the light reflected by the electronic paper area under test is within the corresponding value range in the first driving state and the second driving state.
9. A reflective sampling device for electronic paper, characterized in that, include: Memory, used to store computer programs; A processor, configured to implement the steps of the electronic paper reflective sampling method as described in any one of claims 1 to 7 when executing the computer program.
10. An electronic paper, characterized in that, Includes the reflective sampling device for electronic paper as described in claim 9.