CN118692380B - Method, device and storage medium for improving brightness jump of OLED display screen - Google Patents
Method, device and storage medium for improving brightness jump of OLED display screen Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
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Abstract
The invention relates to the technical field of OLED display screens, and discloses a method, a device and a storage medium for improving brightness jump of an OLED display screen. The method comprises the steps of obtaining brightness change information of an OLED display screen detected by a photoresistor, converting an AD analog quantity into a numerical value according to the brightness change information to obtain brightness numerical information, comparing the brightness numerical information with preset standard numerical value information to obtain difference information between the brightness numerical information and the preset standard numerical value information, inputting the difference information into a preset LQR regulator control model, and outputting adjustment information to control a voltage value of the OLED display screen according to the adjustment information. The method realizes the detection of the brightness of the OLED display screen, improves the problem of brightness jump of the OLED display screen, and improves the stability and reliability of products.
Description
Technical Field
The invention relates to the technical field of OLED display screens, in particular to a method, a device and a storage medium for improving brightness jump of an OLED display screen.
Background
At present, the OLED (organic light emitting diode) display screen technology is an advanced display technology, and by using an organic material layer to emit light under the action of an electric field, the OLED display screen technology realizes high contrast, wide color gamut and quick response time, has the characteristics of light weight, flexibility and low energy consumption, is widely applied to consumer electronic products such as smart phones, televisions, watches and the like, and has wide development prospect and huge market potential.
In one prior art, PWM (pulse width modulation) technology controls the brightness of an OLED display screen by adjusting the duty cycle of the current pulses, i.e. the ratio of the light emission time to the total time. When the PWM technology is optimized to adjust brightness jump, the frequency of PWM can be improved so that human eyes are difficult to perceive small change of brightness, and meanwhile, the duty ratio is accurately adjusted to realize smoother brightness transition, and the brightness jump phenomenon is reduced.
The process of adjusting brightness jump by adopting the PWM technology is not obvious, and a user can still perceive the flicker of a screen, and in a rapidly-changing scene, color distortion can be caused to influence the user experience.
Disclosure of Invention
The invention provides a method, a device and a storage medium for improving brightness jump of an OLED display screen, so as to improve the problem of brightness jump of the OLED display screen and improve user experience.
In order to solve the above technical problems, the present invention provides a method for improving brightness jump of an OLED display screen, including:
Acquiring brightness change information of the OLED display screen detected by the photoresistor;
according to the brightness change information, converting the AD analog quantity into a numerical value quantity to obtain brightness numerical information;
Comparing the brightness numerical information with preset standard numerical information to obtain difference information between the brightness numerical information and the preset standard numerical information;
And inputting the difference information into a preconfigured LQR regulator control model, and outputting adjustment information so as to control the voltage value of the OLED display screen according to the adjustment information.
Preferably, the voltage value information is marked as brightness change information according to the change of the resistance value inside the photoresistor.
Preferably, the brightness change information is quantized to obtain limited value set information;
Coding the limited value set information, converting the limited value set information into digital information, and marking the digital information as brightness numeric information;
Wherein the digital information is represented in binary form.
Preferably, according to the brightness change information, second brightness change information which continuously changes along with time is obtained;
Rounding and cutting off are carried out according to the second brightness change information, so that third brightness change information which changes discretely along with time is obtained;
performing normalization processing according to the third brightness change information to obtain limited value set information;
Wherein the limited value set information is a time-varying value.
Preferably, the difference information between the luminance quantization information and the preset standard numerical information is obtained according to the difference between the luminance quantization information and the preset standard numerical information at the same time.
Preferably, an OLED screen brightness model is constructed according to the brightness change information and voltages on a plurality of OLED units on an OLED screen;
constructing a low-pass filtering transfer function according to the difference information;
And determining the LQR regulator control model according to the screen brightness model and the low-pass filtering transfer function.
Preferably, constructing a state function of an initial linear quadratic regulator of a nonlinear variable according to the screen brightness model and the low-pass filtering transfer function;
taking the brightness numerical information and the voltages on the OLED units at the positions of the OLED units as state parameters;
and determining the LQR regulator control model according to the state function and the state parameter.
Preferably, according to the adjustment information, converting the DA numerical value into an analog value to obtain an adjusted voltage value;
and controlling the voltage value of the OLED display screen according to the adjusted voltage value.
A second aspect of an embodiment of the present invention provides a device for improving brightness jump of an OLED display, including:
the data acquisition module is used for acquiring brightness change information of the OLED display screen detected by the photoresistor;
The information conversion module is used for converting the AD analog quantity into the numerical value quantity according to the brightness change information to obtain brightness numerical information;
the numerical calculation module is used for comparing the brightness numerical information with preset standard numerical information to obtain difference information between the brightness numerical information and the preset standard numerical information;
The instruction control module is used for inputting the difference information into a preconfigured LQR regulator control model and outputting adjustment information so as to control the voltage value of the OLED display screen according to the adjustment information.
A third aspect of the embodiment of the present invention provides a computer readable storage medium, where the computer readable storage medium includes a stored computer program, where when the computer program runs, the computer readable storage medium is controlled to execute the method for improving brightness jump of an OLED display screen according to the first aspect.
Compared with the prior art, the invention has the following beneficial effects:
The invention provides a method, a device and a storage medium for improving brightness jump of an OLED display screen, wherein the method is executed by a controller and comprises the steps of obtaining brightness change information of the OLED display screen detected by a photoresistor, converting AD analog quantity into numerical quantity according to the brightness change information to obtain brightness numeric information, comparing the brightness numeric information with preset standard numerical value information to obtain difference information between the brightness numeric information and the preset standard numerical value information, inputting the difference information into a preset LQR regulator control model, and outputting adjustment information to control a voltage value of the OLED display screen according to the adjustment information.
The brightness change condition of the OLED display screen is detected in real time through the photoresistor, the brightness change condition is analyzed, and when the preset brightness jump information of the OLED screen has large difference, the voltage of each small unit of the OLED screen is adjusted. In the process, the photoresistor detects the brightness change of the OLED display screen in real time, so that whether the display screen has brightness jump or not can be judged, and the transition of the brightness of the OLED display screen is more stable by using the LQR regulator control model. The whole process not only realizes the detection of the brightness of the OLED display screen, but also solves the problem of brightness jump of the display screen, and improves the stability and reliability of the product.
Drawings
FIG. 1 is a schematic flow chart of a method for improving brightness jump of an OLED display screen according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a process for converting AD analog quantity into digital quantity according to an embodiment of the invention;
FIG. 3 is a schematic diagram of an LQR regulator control model training process provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a method for improving brightness jump of an OLED display according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a first embodiment of the present invention provides a method for improving brightness jump of an OLED display screen, including the following steps:
s11, brightness change information of the OLED display screen detected by the photoresistor is obtained.
And S12, converting the AD analog quantity into a numerical value quantity according to the brightness change information to obtain brightness numerical information.
S13, comparing the brightness numerical information with preset standard numerical information to obtain difference information between the brightness numerical information and the preset standard numerical information.
S14, inputting the difference information into a preconfigured LQR regulator control model, and outputting adjustment information so as to control the voltage value of the OLED display screen according to the adjustment information.
It should be noted that, an OLED (organic light emitting diode) display screen is an advanced display technology, and has the characteristics of high contrast, low power consumption, fast response time, thin design, and the like. However, OLED displays also present challenges in brightness control, one of which is controlling brightness transitions. OLED screen emits light through organic luminescent material, and too high brightness can lead to screen temperature to rise, accelerates material ageing, shortens life. In addition, excessive brightness may cause irritation to the eyes of the user in some cases, affecting vision health. Therefore, through intelligent brightness adjustment, the screen can be ensured to provide comfortable watching experience under different environments, and meanwhile, the energy consumption is reduced, so that energy conservation and environmental protection are realized. The brightness control technology can automatically adjust the brightness of the screen according to the change of the ambient light and the preference of the user, reduce unnecessary light pollution, improve the display effect of the screen, and ensure that the screen can still be kept clear and vivid in the long-time use process of the user.
In the embodiment of the invention, the change condition of the brightness of the OLED display screen is detected in real time through the photoresistor, the brightness change condition is analyzed, and when the brightness change condition is larger than the preset jump information of the brightness of the OLED screen, the voltage of each small unit of the OLED screen is adjusted. In the process, the photoresistor detects the brightness change of the OLED display screen in real time, so that whether the display screen has brightness jump or not can be judged, and the transition of the brightness of the OLED display screen is more stable by using the LQR regulator control model. The whole process not only realizes the detection of the brightness of the OLED display screen, but also solves the problem of brightness jump of the display screen, and improves the stability and reliability of the product.
In step S11, brightness change information of the OLED display screen detected by the photoresistor is obtained.
It should be noted that, a photoresistor is a common device for detecting illumination intensity in modern industry, and the photoresistor is a resistor made of a photoresistor, whose resistance value varies with the change of illumination intensity. This characteristic makes photoresistors widely used in automatic control and detection systems, such as automatic lighting, photometers, camera exposure control, etc. The photoresistors are typically made of semiconductor materials, commonly known as cadmium sulfide (CdS), lead selenide (PbS), and the like. When no light or light is weak, the resistance value of the photoresistor is large, and when the light intensity is increased, the resistance value is obviously reduced. This variation is the basis for the photoresistor to effect conversion of the optical signal into an electrical signal in the circuit.
Illustratively, the photoresistor in the embodiment is made of lead sulfide (PbS) material, the resistor made of the material has good sensitivity, can quickly respond to light intensity changes, and converts the change of the resistance value inside the photoresistor into voltage value information, and marks the voltage value information as brightness change information.
As shown in fig. 2, step S12 is performed to convert the AD analog quantity into the digital quantity according to the brightness change information, so as to obtain brightness numeric information. Comprising the following steps:
S121, carrying out quantization processing on the brightness change information to obtain limited value set information;
s122, coding the limited value set information, converting the limited value set information into digital information, and marking the digital information as brightness numerical information.
In the first step of analog-to-digital conversion, the analog signal, which is the brightness change information, is sampled at discrete sampling points within a certain time interval. Sampling may be performed in different ways, including periodic sampling, gap sampling, and just-in-time sampling, among others. The sampling frequency determines the number of samples acquired per second, typically in hertz (Hz). The analog signal, which is the luminance change information after sampling, is also continuous and needs to be quantized into discrete digital values. The quantization process maps the amplitude of the sampling points onto discrete levels, thus involving the selection of the quantizer and the determination of the quantization levels. Typically, equidistant discrete levels are employed and ADC (Analog-to-Digital Converter) is used to perform quantization operations. The quantized sample values need to be encoded and represented as binary data for convenient storage and transmission. The encoded binary data may be further processed and analyzed by a digital signal processor, microcontroller, or other digital system.
Where the sampling and quantization accuracy affects the resolution of the AD conversion, which determines the number of discrete levels that can be represented. The higher the resolution, the finer the representation capability, which can provide a more accurate digital representation. The accuracy refers to the proximity of the AD converter output data to the actual analog signal.
In step S121, the quantization processing is performed on the brightness change information to obtain finite value set information, including:
Obtaining second brightness change information which continuously changes along with time according to the brightness change information, rounding and cutting according to the second brightness change information to obtain third brightness change information which changes along with time in a discrete mode, carrying out normalization processing according to the third brightness change information to obtain limited value set information, wherein the limited value set information is a value which changes along with time.
The second brightness change information is numerical value information after the time parameter is considered, and the third brightness change information is a discrete function which changes with time and has numerical value only at a specific time. In the present embodiment, the normalization processing is performed on the third luminance change information to convert the numerical value information into a numerical value between 0 and 255.
In step 122, the limited value set information is encoded and converted into digital information, and the digital information is marked as brightness numeric information, which comprises:
The quantized numerical information is encoded into a binary digital code, which involves a specific number of bits, e.g. 8 bits, 16 bits or more, the higher the number of bits, the wider the range of values that can be represented and the higher the resolution. Finally, this binary digital code is used to represent a specific light intensity amplitude of the original illumination analog signal, thereby completing the conversion from analog to digital.
In this embodiment, an 8-bit AD converter is selected for sampling, the frequency of the converter is 20HZ in a periodic sampling manner with a period of 0.05s, quantization processing is performed after sampling, the processed finite value set information is 0-255, and finally the quantized value information is encoded and converted into binary data for storage and transmission.
In step S13, comparing the brightness quantization information with preset standard numerical information to obtain difference information between the brightness quantization information and the preset standard numerical information, including:
And according to the brightness numerical information and the preset standard numerical information, making a difference between the brightness numerical information and the preset standard numerical information at the same time, and obtaining difference information between the brightness numerical information and the preset standard numerical information.
The preset standard value information is preset by a user, and may be 100 brightness value units of brightness change per second, where the brightness value units are unit values of the brightness value information of the photoresistor, and the invention is not limited in particular.
The brightness numerical information is compared with preset standard numerical information, specifically, binary numerical information and binary preset standard numerical information are subjected to difference to obtain difference information. In this example, the binary value is 8 bits, and these 8-bit binary numbers are subjected to an interaction difference, and then stored as 8-bit binary numbers.
As shown in fig. 3, in step S14, the difference information is input into a preconfigured LQR regulator control model, and adjustment information is output to control a voltage value of an OLED display screen according to the adjustment information, including:
S141, constructing an OLED screen brightness model according to the brightness change information and voltages on a plurality of OLED units on an OLED screen;
s142, constructing a low-pass filtering transfer function according to the difference information;
s143, determining the LQR regulator control model according to the screen brightness model and the low-pass filtering transfer function.
It should be noted that, the LQR regulator control model is configured to input the screen brightness model and the low-pass filter transfer function as parameters, obtain the cost function of the LQR by analyzing the two models, obtain the minimum value of the cost function by iterative operation, and output the operation result as an adjustment value to be used for adjusting the voltage condition of the OLED display screen.
In step S141, an OLED screen brightness model is constructed according to the brightness variation information and the voltages of the plurality of OLED cells on the OLED screen, including:
The change condition of the screen brightness is numerical information changing with time, the voltages of the plurality of OLED units on the OLED screen are determined by the controller, and in the embodiment, the numerical information is determined by the following calculation formula:
Wherein, For the model of the brightness of the OLED screen,For the luminance change information to change with time,For the voltage value across the OLED cells on the OLED screen,Is the abscissa of the OLED cells on the OLED screen,Is the ordinate of the OLED cells on the OLED screen,Representing the time parameter.
In this embodiment, the abscissa direction of the OLED cells is the long side of the OLED screen, and the ordinate direction of the OLED cells is the short side of the OLED screen.
In step S142, a low-pass filter transfer function is constructed from the difference information. In the embodiment of the invention, the relation between the voltages of the OLED display screen to be controlled and the ideal OLED display screen can be used for constructing the low-pass filter transfer function, and the low-pass filter transfer function is as follows:
In the above-mentioned formula(s), For the low-pass filter transfer function,For the frequency of the OLED display screen,As a function of the transfer function of the object,Is the difference information between the brightness numerical information and the preset standard numerical information at the same time.
In step S143, the LQR regulator control model is determined according to the screen brightness model and the low-pass filter transfer function, and the method comprises the steps of constructing a state function of an initial linear quadratic regulator of a nonlinear variable according to the screen brightness model and the low-pass filter transfer function, taking brightness numeric information and voltages on a plurality of OLED units at the positions of the OLED units as state parameters, and determining the LQR regulator control model according to the state function and the state parameters.
Specifically, the method comprises the following steps:
setting a target voltage change condition of the OLED display screen, wherein the target voltage change condition is represented by the following formula:
in the formula, The voltage value is adjusted for the OLED display screen,A matrix is preset for the system and,Is a linear feedback regulator parameter of the present invention.
It should be noted that the number of the substrates,Preset matrix for system, preset by user, linear feedback controllerThen the adjusted voltage value of the OLED display screen can be written as:
in the formula, A parameter value, denoted as linear feedback, a step value representing feedback,Represents the regulated voltage value of the OLED display,A matrix is preset for the system, preset by the user,Is an OLED screen brightness model.
In this process, in order to make the control effect of the controller optimal, the invention defines a cost function:
(1)
In the formula,AndTwo diagonal parameter matrixes respectively determine the brightness model of the OLED screenLinear feedback regulatorIs of importance in terms of (a) the importance of (c),The time parameter is represented by a time parameter,Is a transpose of the OLED screen brightness model,Is the transpose of the linear feedback regulator vector.
It should be noted that the cost functionAnd at the minimum, the optimal screen brightness jump condition can be obtained. For the expression (1), the present invention defines an auxiliary constant matrix P, having the following expression:
(2)
in the formula, The auxiliary constant matrix is represented as such,Is a transpose of the OLED screen brightness model,Is the transpose of the linear feedback regulator vector,In the form of a linear feedback regulator vector,For the model of the brightness of the OLED screen,AndTwo diagonal parameter matrixes respectively determine the brightness model of the OLED screenLinear feedback regulatorIs of importance.
Bringing the formula (2) into the formula (1)
(3)
In the formula,Is a transpose of the OLED screen brightness model,The auxiliary constant matrix is represented as such,Is an OLED screen brightness model. From equation (3), in order to make the cost functionMinimum, i.e. letThe parameter matrix is minimal. Expanding the left derivative term of equation (2) yields:
(4)
in the formula, Is a transpose of the OLED screen brightness model,Representing the difference between the preset matrix coefficients and the feedback controller coefficients,Representing a transpose of the difference between the preset matrix coefficients and the feedback controller coefficients,For the model of the brightness of the OLED screen,A parameter value, denoted as linear feedback, a step value representing feedback,Represented as a transpose of one parameter value of the linear feedback,The auxiliary constant matrix is represented as such,AndIs a matrix of two diagonal parameters,A matrix is preset for the system.
And (3) performing matrix secondary reduction on the step (4) to obtain the following formula:
in the formula, A matrix is preset for the system and,AndIs a matrix of two diagonal parameters,For the inverse operation of the diagonal matrix,The transpose of the matrix is preset for the system,Representing the auxiliary constant matrix. From the above, the auxiliary matrix can be obtained。
Thereafter, the following formula is used
In the formula,A parameter value, denoted as linear feedback, representing the step value of the feedback; for the inverse operation of diagonal matrix The transpose of the matrix is preset for the system,Representing the auxiliary constant matrix. The coefficient of the optimized feedback controller can be calculated by the above methodAt the moment, give,After the coefficients are equal, substituting the coefficients into the formula (3) to obtain a cost functionIs a minimum of (2). Using cost functionsAnd performing secondary linear feedback to obtain an adjusted OLED display voltage change value.
It should be further noted that, controlling the voltage value of the OLED display screen according to the adjustment information includes:
according to the adjustment information, converting the DA numerical value into an analog value to obtain an adjusted voltage value; and controlling the voltage value of the OLED display screen according to the adjusted voltage value.
The conversion from the DA value to the analog value is opposite to the conversion from the AD analog value to the digital value, and is not described herein, and the adjusted voltage value controls the brightness of the OLED display according to the time relationship to improve the brightness jump of the OLED display.
In order to facilitate an understanding of the invention, some preferred embodiments of the invention will be described further below.
In the embodiment, a control system for improving brightness jump of an OLED display screen is provided, and the system comprises a light intensity detection module, a state conversion module, a data processing module, a user preset end and a central processing unit. These components work cooperatively to ensure that the brightness jump of the OLED display screen is accurately improved.
The working process is as follows:
Step one, users input the brightness target value which they wish to reach through the interactive interface. The target value is represented in a numerical form, usually an accurate brightness level, and represents the light intensity change condition which is required to be achieved by the OLED display screen in a final state, and the input of a user triggers a series of operations in the system to start a brightness adjustment process;
step two, once a user inputs a target brightness value, the system immediately starts an OLED display screen, and meanwhile, a light intensity detection module starts to operate, monitors the light intensity emitted by the display screen in real time through a sensor, records the change condition of the light intensity along with time, and allows the system to acquire the actual brightness level of the current display screen so as to facilitate the subsequent adjustment step;
In the step III, the analog illumination intensity information from the light intensity detection module is input into a state conversion module, the core function of the module is to convert an analog signal into a digital signal (AD conversion) so as to perform more accurate numerical calculation and processing, and the system obtains numerical information capable of reflecting the actual brightness of the current OLED display screen through the conversion process;
In the numerical conversion process, the system can carry out precision adjustment according to the characteristics of the selected resistor module and the AD converter, which means that the system not only simply converts analog signals into digital signals, but also considers the characteristics and limitations of hardware equipment, so that the converted numerical value is ensured to have enough precision to meet the requirements of brightness adjustment of a display screen;
The system compares the currently obtained brightness value with the target brightness value input by the user through a data processing module, and can calculate a difference value through the comparison, wherein the difference value represents the deviation between the current brightness and the expected brightness of the display screen, and the result of the step is a real-time difference value for further adjustment;
And step six, the calculated difference information is input into an LQR (Linear quadratic regulator) control model. The LQR model is an advanced control algorithm that can optimize parameters of the control system through multiple iterations. Through the processing of the difference information, the LQR model continuously adjusts and optimizes the control parameters of the system until the most suitable voltage output parameters are found so as to minimize the brightness deviation;
And step seven, after the LQR model is optimized, the system outputs an adjusted voltage parameter, the parameter is converted into a voltage signal which can be used by the OLED display screen through a DA (digital-to-analog conversion) module, and finally, the brightness of the display screen is adjusted according to the optimized voltage signal, so that the effect of matching with a brightness target preset by a user is realized.
Through the steps and the system design, the control system for improving the brightness jump of the OLED display screen can realize the improvement of the brightness jump of the OLED display screen with high automation and intelligence, improve the performance of the OLED display screen, realize the detection of the brightness of the OLED display screen, solve the problem of the brightness jump of the display screen and improve the stability and the reliability of products.
In summary, the invention provides a method, a device and a storage medium for improving brightness jump of an OLED display screen, wherein the method is executed by a controller and comprises the steps of obtaining brightness change information of the OLED display screen detected by a photoresistor, converting AD analog quantity into numerical quantity according to the brightness change information to obtain brightness numeric information, comparing the brightness numeric information with preset standard numerical information to obtain difference information between the brightness numeric information and the preset standard numerical information, inputting the difference information into a preset LQR regulator control model, and outputting adjustment information to control a voltage value of the OLED display screen according to the adjustment information. The brightness change condition of the OLED display screen is detected in real time through the photoresistor, the brightness change condition is analyzed, and when the preset brightness jump information of the OLED screen has large difference, the voltage of each small unit of the OLED screen is adjusted. In the process, the photoresistor detects the brightness change of the OLED display screen in real time, so that whether the display screen has brightness jump or not can be judged, and the transition of the brightness of the OLED display screen is more stable by using the LQR regulator control model. The whole process not only realizes the detection of the brightness of the OLED display screen, but also solves the problem of brightness jump of the display screen, and improves the stability and reliability of the product.
Referring to fig. 4, a second embodiment of the present invention provides an apparatus for improving brightness jump of an OLED display screen, including:
the data acquisition module is used for acquiring brightness change information of the OLED display screen detected by the photoresistor;
The information conversion module is used for converting the AD analog quantity into the numerical value quantity according to the brightness change information to obtain brightness numerical information;
the numerical calculation module is used for comparing the brightness numerical information with preset standard numerical information to obtain difference information between the brightness numerical information and the preset standard numerical information;
The instruction control module is used for inputting the difference information into a preconfigured LQR regulator control model and outputting adjustment information so as to control the voltage value of the OLED display screen according to the adjustment information.
In one embodiment, the data acquisition module comprises:
the light intensity detection module is used for converting the brightness value of the OLED display screen captured by the photoresistor into a voltage value;
and the time information combining module is used for combining the brightness information of the OLED display screen with the time information and converting the brightness change information into function values related to time and light intensity.
In one embodiment, the data acquisition module is further configured to:
and converting the change of the resistance value in the photoresistor into voltage value information, and marking the voltage value information as brightness change information.
In one embodiment, the information conversion module is configured to:
and converting the AD analog quantity into a numerical value according to the brightness change information to obtain brightness numerical information. The method comprises the steps of carrying out quantization processing on brightness change information to obtain limited value set information, and coding and converting the limited value set information into digital information, wherein the digital information is marked as brightness numeric information.
The method comprises the steps of obtaining second brightness change information which continuously changes along with time according to the brightness change information, rounding and cutting according to the second brightness change information to obtain third brightness change information which discretely changes along with time, and normalizing according to the third brightness change information to obtain limited value set information, wherein the limited value set information is a value which changes along with time. The second brightness change information is numerical value information after the time parameter is considered, and the third brightness change information is a discrete function which changes with time and has numerical value only at a specific time. In the present embodiment, the normalization processing is performed on the third luminance change information to convert the numerical value information into a numerical value between 0 and 255. The quantized numerical information is encoded into a binary digital code, which involves a specific number of bits, e.g. 8 bits, 16 bits or more, the higher the number of bits, the wider the range of values that can be represented and the higher the resolution. Finally, this binary digital code is used to represent a specific light intensity amplitude of the original illumination analog signal, thereby completing the conversion from analog to digital. In this embodiment, the sampling selects an 8-bit AD converter, the frequency of the converter is 20HZ in a periodic sampling manner with 0.05s as a period, quantization processing is performed after sampling, the processed limited value set information is 0-255, and finally the quantized value information is encoded and converted into binary data for storage and transmission.
In one embodiment, the numerical calculation module is further configured to:
And according to the brightness numerical information and the preset standard numerical information, making a difference between the brightness numerical information and the preset standard numerical information at the same time, and obtaining difference information between the brightness numerical information and the preset standard numerical information.
It should be noted that, the preset standard value information is preset by the user, and may be 100 brightness value units of brightness change per second, where the brightness value units are unit values of the brightness value information of the photoresistor, which is not specifically limited in the present invention.
It should be further noted that, the brightness quantization information is compared with preset standard numerical information, specifically, a difference is made between binary quantization information and binary preset standard numerical information, so as to obtain the difference information. In this example, the binary value is 8 bits, and these 8-bit binary numbers are subjected to an interaction difference, and then stored as 8-bit binary numbers.
In one embodiment, the instruction control module is further configured to:
The control method comprises the steps of constructing an OLED screen brightness model according to brightness change information and voltages on a plurality of OLED units on an OLED screen, constructing a low-pass filtering transfer function according to difference information, and determining an LQR regulator control model according to the screen brightness model and the low-pass filtering transfer function.
It should be noted that, the LQR regulator control model is configured to input the screen brightness model and the low-pass filter transfer function as parameters, obtain the cost function of the LQR by analyzing the two models, obtain the minimum value of the cost function by iterative operation, and output the operation result as an adjustment value to be used for adjusting the voltage condition of the OLED display screen.
The method includes the steps of obtaining a voltage value of an OLED display screen, and controlling the voltage value of the OLED display screen according to the voltage value after adjustment.
In summary, the invention provides a method, a device and a storage medium for improving brightness jump of an OLED display screen, wherein the method is executed by a controller and comprises the steps of obtaining brightness change information of the OLED display screen detected by a photoresistor, converting AD analog quantity into numerical quantity according to the brightness change information to obtain brightness numeric information, comparing the brightness numeric information with preset standard numerical information to obtain difference information between the brightness numeric information and the preset standard numerical information, inputting the difference information into a preset LQR regulator control model, and outputting adjustment information to control a voltage value of the OLED display screen according to the adjustment information. The brightness change condition of the OLED display screen is detected in real time through the photoresistor, the brightness change condition is analyzed, and when the preset brightness jump information of the OLED screen has large difference, the voltage of each small unit of the OLED screen is adjusted. In the process, the photoresistor detects the brightness change of the OLED display screen in real time, so that whether the display screen has brightness jump or not can be judged, and the transition of the brightness of the OLED display screen is more stable by using the LQR regulator control model. The whole process not only realizes the detection of the brightness of the OLED display screen, but also solves the problem of brightness jump of the display screen, and improves the stability and reliability of the product.
It should be noted that, the control system for improving brightness jump of the OLED display screen provided by the embodiment of the present invention is used for executing all the flow steps of the method for improving brightness jump of the OLED display screen in the above embodiment, and the working principles and beneficial effects of the two correspond one to one, so that the description is omitted.
The embodiment of the invention also provides electronic equipment. The electronic device includes a processor, a memory, and a computer program, such as an LQR regulator control program, stored in the memory and executable on the processor. The processor executes the computer program to implement the steps in the above embodiments of the method for controlling brightness of an OLED display screen, for example, step S11 shown in fig. 1. Or the processor, when executing the computer program, performs the functions of the modules/units in the above-described device embodiments, such as an information conversion module.
The computer program may be divided into one or more modules/units, which are stored in the memory and executed by the processor to accomplish the present invention, for example. The one or more modules/units may be a series of computer program instruction segments capable of performing the specified functions, which instruction segments are used for describing the execution of the computer program in the electronic device.
The electronic equipment can be a desktop computer, a notebook computer, a palm computer, an intelligent tablet and other computing equipment. The electronic device may include, but is not limited to, a processor, a memory. It will be appreciated by those skilled in the art that the above components are merely examples of electronic devices and are not limiting of electronic devices, and may include more or fewer components than those described above, or may combine certain components, or different components, e.g., the electronic devices may also include input-output devices, network access devices, buses, etc.
The Processor may be a central processing unit (Central Processing Unit, CPU), other general purpose Processor, digital signal Processor (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), off-the-shelf Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like that is a control center of the electronic device, connecting various parts of the overall electronic device using various interfaces and lines.
The memory may be used to store the computer program and/or modules, and the processor may implement various functions of the electronic device by running or executing the computer program and/or modules stored in the memory and invoking data stored in the memory. The memory may mainly include a storage program area which may store an operating system, an application program required for at least one function (such as a sound playing function, an image playing function, etc.), etc., and a storage data area which may store data created according to the use of the cellular phone (such as audio data, a phonebook, etc.), etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart memory card (SMART MEDIA CARD, SMC), secure Digital (SD) card, flash memory card (FLASH CARD), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
Wherein the integrated modules/units of the electronic device may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as stand alone products. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
It should be noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the invention, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. A method of improving brightness transitions of an OLED display screen, the method comprising:
Acquiring brightness change information of the OLED display screen detected by the photoresistor;
according to the brightness change information, converting the AD analog quantity into a numerical value quantity to obtain brightness numerical information;
Comparing the brightness numerical information with preset standard numerical information to obtain difference information between the brightness numerical information and the preset standard numerical information;
Inputting the difference information into a preconfigured LQR regulator control model, and outputting adjustment information so as to control the voltage value of an OLED display screen according to the adjustment information;
wherein, the configuration process of the LQR regulator control model comprises the following steps:
According to the brightness change information and the voltages on a plurality of OLED units on the OLED screen, an OLED screen brightness model is constructed;
constructing a low-pass filtering transfer function according to the difference information;
determining the LQR regulator control model according to the screen brightness model and the low-pass filtering transfer function;
wherein said determining said LQR regulator control model from said screen brightness model and said low pass filter transfer function comprises:
constructing a state function of an initial linear quadratic regulator of a nonlinear variable according to the screen brightness model and the low-pass filtering transfer function;
taking the brightness numerical information and the voltages on the OLED units at the positions of the OLED units as state parameters;
determining the LQR regulator control model according to the state function and the state parameter;
The LQR regulator control model takes the screen brightness model and the low-pass filter transfer function as parameters to be input, the cost function of the LQR is obtained by analyzing the two models, the cost function is enabled to obtain the minimum value through iterative operation, and then an operation result is output as an adjustment value to be used for adjusting the voltage condition of the OLED display screen.
2. The method for improving brightness jump of an OLED display screen according to claim 1, wherein the obtaining brightness change information of the OLED display screen detected by the photoresistor includes:
and converting the change of the resistance value in the photoresistor into voltage value information, and marking the voltage value information as brightness change information.
3. The method for improving brightness jump of an OLED display screen according to claim 1, wherein the converting from AD analog to digital according to the brightness change information to obtain brightness numeric information includes:
carrying out quantization processing on the brightness change information to obtain limited value set information;
Coding the limited value set information, converting the limited value set information into digital information, and marking the digital information as brightness numeric information;
Wherein the digital information is represented in binary form.
4. The method for improving brightness jump of OLED display screen according to claim 3, wherein the performing quantization processing on the brightness change information to obtain limited value set information includes:
obtaining second brightness change information which continuously changes along with time according to the brightness change information;
Rounding and cutting off are carried out according to the second brightness change information, so that third brightness change information which changes discretely along with time is obtained;
performing normalization processing according to the third brightness change information to obtain limited value set information;
Wherein the limited value set information is a time-varying value.
5. The method for improving brightness jump of an OLED display screen according to claim 1, wherein comparing the brightness quantization information with preset standard numerical information to obtain difference information between the brightness quantization information and the preset standard numerical information includes:
And according to the brightness numerical information and the preset standard numerical information, making a difference between the brightness numerical information and the preset standard numerical information at the same time, and obtaining difference information between the brightness numerical information and the preset standard numerical information.
6. The method for improving brightness jump of an OLED display screen according to claim 1, wherein controlling the voltage value of the OLED display screen according to the adjustment information comprises:
According to the adjustment information, converting the DA numerical value into an analog value to obtain an adjusted voltage value;
and controlling the voltage value of the OLED display screen according to the adjusted voltage value.
7. An apparatus for improving brightness jump of an OLED display screen, wherein the method for improving brightness jump of an OLED display screen as claimed in any one of claims 1 to 6 comprises:
the data acquisition module is used for acquiring brightness change information of the OLED display screen detected by the photoresistor;
The information conversion module is used for converting the AD analog quantity into the numerical value quantity according to the brightness change information to obtain brightness numerical information;
the numerical calculation module is used for comparing the brightness numerical information with preset standard numerical information to obtain difference information between the brightness numerical information and the preset standard numerical information;
The instruction control module is used for inputting the difference information into a preconfigured LQR regulator control model and outputting adjustment information so as to control the voltage value of the OLED display screen according to the adjustment information.
8. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored computer program, wherein the computer program, when run, controls a device in which the computer readable storage medium is located to perform the method of improving brightness jump of an OLED display screen according to any one of claims 1 to 6.
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| CN105654908A (en) * | 2015-11-06 | 2016-06-08 | 乐视移动智能信息技术（北京）有限公司 | Brightness change control method and apparatus thereof |
| CN109951595A (en) * | 2017-12-20 | 2019-06-28 | 广东欧珀移动通信有限公司 | Method and device for intelligently adjusting screen brightness, storage medium and mobile terminal |
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| CN105632447A (en) * | 2016-03-31 | 2016-06-01 | 青岛海信移动通信技术股份有限公司 | Method and device for adjusting display brightness of a liquid crystal display |
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