Display screen correction method, display screen system and automobile
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HASCO VISION TECHNOLOGY CO LTD
- Filing Date
- 2024-08-07
- Publication Date
- 2026-04-10
AI Technical Summary
In existing technologies, the power-on calibration of a display requires a large amount of storage space and time, resulting in excessively long power-on waiting times.
By establishing the relationship between theoretical PWM values and brightness values at different temperature points as correction parameters, the brightness and PWM values that should be generated at each gray level are directly calculated, reducing storage space and memory requirements and improving read speed.
It reduces the storage space required for correction coefficients, saves hardware costs, shortens boot-up time, and improves ease of use.
Smart Images
Figure CN121844375A_ABST
Abstract
Description
Display screen correction method, display screen system and automobile TECHNICAL FIELD
[0001] The present application relates to the technical field of display screen correction, in particular to a display screen correction method, a display screen system and an automobile. BACKGROUND
[0002] With the improvement of the consumption level of residents, the demand of residents for electronic products has broken through the pure functional requirements, and more attention is paid to grades, tastes, decorations, energy saving, environmental protection and the like. In recent years, products using LED as the basic material have been recognized as an important development object of energy saving and environmental protection. In particular, LED display screens are used more and more widely in people's life.
[0003] Because of the reasons such as the light emission of LED lamps and the discrete type of IC channel current, the LED lamps on the same screen are difficult to achieve the same brightness, so the correction technology is born.
[0004] The currently generally used correction method is overall white balance correction or point-by-point correction, which all need to test the color brightness of R / G / B under the room, and then calculate the contribution ratio of R / G / B according to the set white balance color brightness to obtain a set of parameters as the correction parameters.
[0005] However, because there are a large number of correction coefficients, a large storage space is needed to store the correction coefficients, and it takes a very long time to read these parameters into the memory when powered on, resulting in a long waiting time for booting to display normally, which brings certain inconvenience to use.
[0006] SUMMARY
[0007] The present application aims to overcome the problem of long waiting time for display screen boot correction in the prior art,
[0008] In a first aspect, a display screen correction method is provided, which reduces the storage space required for correction coefficients, has fast reading speed, greatly reduces the start-up time, and thus reduces the waiting time for booting.
[0009] In a second aspect, a display screen system is provided, which uses the above-mentioned correction method, and has fast booting and convenient use.
[0010] In a third aspect, an automobile is provided, which uses the above-mentioned display screen system and has convenient use.
[0011] In order to achieve the above-mentioned purpose, the first aspect of the present application provides a display screen correction method, comprising the following steps:
[0012] S1, obtaining a theoretical PWM value PWM of a light source at different temperature points in a set temperature range A truthThe temperature range A is a temperature range in which the light source needs to maintain the brightness value;
[0013] S2, reading the gray scale value of the light source to obtain the brightness value Lvc to be displayed for each color according to the read gray scale value;
[0014] S3, according to the PWM truth The brightness value Lvc in step S2 is input into the PWM output value in the light source driving and the light source is lit according to the PWM output value.
[0015] In some embodiments, before step S1, it includes:
[0016] S1-1, selecting a set temperature point in the set temperature range A, obtaining the driving current corresponding to the light source reaching the brightness white balance at the set temperature point, wherein the temperature range B covered by each driving current is [t1, t2];
[0017] The maximum brightness value Lvc of the light source under the temperature point corresponding driving current is tested at different temperature points in the temperature range B covered by each driving current max ;
[0018] Obtaining the relationship between the PWM value and the brightness value at different temperature points in the set temperature range A;
[0019] S1-2, according to the maximum brightness value Lvc max And the relationship between the PWM value and the brightness value, the theoretical PWM value PWM truth And the brightness value.
[0020] In some embodiments, the set temperature range A is [T1, T2], and in the step of selecting a set temperature point in the set temperature range A, the set temperature point selected in the set temperature range A is N, N is calculated by the formula:
[0021] N = (T2-T1) / t, calculated by
[0022] Wherein, N is a positive integer, and t is the temperature gradient covered by the set driving current.
[0023] In some embodiments, the set temperature point is the maximum temperature point in the temperature range B covered by the driving current corresponding to the set temperature point.
[0024] In some embodiments, in step S1-2, the method for obtaining the theoretical PWM value PWM truth And the brightness value includes:
[0025] According to the maximum brightness value Lvc maxand the relationship between the PWM value and the brightness value to obtain the theoretical PWM value PWM truth ;
[0026] The theoretical PWM value PWM truth at each temperature point is obtained by fitting the relationship between the PWM value and the brightness value.
[0027] In some embodiments, step S1-1 further includes: after testing the maximum brightness value Lvc max of the light source at the temperature point corresponding to the driving current, fitting a functional relationship between Lvc max and the temperature, and the functional relationship between Lvc max and the temperature is a linear relationship.
[0028] In some embodiments, in step S1-1, the method of obtaining the relationship between the PWM value and the brightness value at different temperature points in the set temperature range A includes: changing the proportion of the PWM value, measuring the PWM value PWMN and the brightness value LvcN at different temperature points in the set temperature range A, and obtaining a functional relationship between PWMN and LvcN at different temperature points as follows:
[0029] PWMN = AN × LvcN + BN,
[0030] wherein AN and BN are parameters obtained by fitting, and AN ≠ 0.
[0031] In some embodiments, the theoretical PWM value PWM max at different temperature points is calculated according to the maximum brightness value Lvc truth and the relationship between the PWM value and the brightness value, and includes:
[0032] The theoretical PWM value PWM max at different temperature points is calculated according to the functional relationship between Lvc max at different temperature points and the brightness value Lvc max at the first set temperature point higher than the temperature point, and then the theoretical PWM value PWM truth at different temperature points is obtained according to the proportion value KN and the functional relationship between PWMN and the brightness value LvcN at different temperature points.
[0033] In some embodiments, the calculation formula of the theoretical PWM value PWM truth at different temperature points obtained according to the proportion value KN and the functional relationship between PWMN and the brightness value LvcN at different temperature points is as follows:
[0034] PWM truth = KN × PWMN.
[0035] In some embodiments, in step S2, the method for obtaining the luminance value Lvc to be displayed by each color comprises:
[0036] obtaining a corresponding luminance value Lvg according to the gray scale value and the Gamma table;
[0037] calculating the luminance value Lvd of each color according to the luminance value Lvg;
[0038] calculating the luminance value Lvc to be displayed by each color according to the luminance value Lvd.
[0039] In some embodiments, in step S2, the calculation formula for calculating the luminance value Lvd of each color according to the luminance value Lvg is:
[0040] Lvd = K Lvs × K Lvd × Lvg,
[0041] wherein K Lvs is the luminance ratio set by the master control, K Lvd is the luminance value ratio after the reduction, K Lvs and K Lvd are both constants, and K Lvs and K Lvd are both not 0.
[0042] In some embodiments, in step S2, the calculation formula for calculating the luminance value Lvc to be displayed by each color according to the luminance value Lvd is:
[0043] wherein Lvd_R is the Lvd value of red, and Lvc_R is the luminance value to be displayed by red;
[0044] Lvd_G is the Lvd value of green, and Lvc_G is the luminance value to be displayed by green;
[0045] Lvd_B is the Lvd value of blue, and Lvc_B is the luminance value to be displayed by blue.
[0046] The second aspect of the present application provides a display screen system, which adopts the correction method of the display screen described above.
[0047] In some embodiments, the display screen system comprises a control unit, a display screen body, and a temperature detection unit for collecting the ambient temperature, the temperature detection unit is in communication connection with the control unit, the control unit is in communication connection with the display screen body, the control unit adopts the correction method of the display screen described above, and can correct the display screen body.
[0048] The third aspect of the present application provides a vehicle, which adopts the display screen system described above.
[0049] By the technical solution, the application establishes the relationship between the theoretical PWM value and the brightness value at different temperature points as the correction parameter of the correction method, can directly calculate the brightness value and the PWM value generated by each gray scale, thereby adjusting the PWM output value, maintaining the stability of the brightness of the display screen in the temperature range where the brightness needs to be maintained, compared with the traditional correction method, reducing the storage space required by the correction coefficient, saving the hardware cost, without the support of the memory of the system during operation, can greatly reduce the start-up time, reduce the waiting time of the start-up, greatly improve the convenience. BRIEF DESCRIPTION OF DRAWINGS
[0050] Fig. 1 is a flow chart of the display screen correction method in the embodiment of the application;
[0051] Fig. 2 is a flow chart of the correction parameter calculation process in the embodiment of the application;
[0052] Fig. 3 is a flow chart of the correction process in the embodiment of the application;
[0053] Fig. 4 is a schematic diagram of the correction process in the embodiment of the application;
[0054] Fig. 5 is a system block diagram of the display screen system in the embodiment of the application.
[0055] BRIEF DESCRIPTION OF DRAWINGS
[0056] 1, sending unit; 2, receiving unit; 21, memory; 22, processor; 3, display screen body; 31, temperature detection unit. DETAILED DESCRIPTION
[0057] The embodiments of the application are further described in detail below with reference to the accompanying drawings and embodiments. The detailed description and drawings of the following embodiments are used to illustrate the principles of the application, but cannot be used to limit the scope of the application, and the application can be implemented in many different forms, not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.
[0058] The application provides these embodiments in order to make the application thorough and complete, and fully express the scope of the application to those skilled in the art. It should be noted that: unless otherwise specified, the relative arrangement of components and steps, the composition of materials, numerical expressions and values set forth in these embodiments should be interpreted as merely exemplary, and not as a limitation.
[0059] All terms used herein are intended to have the meanings as commonly understood by those of ordinary skill in the art to which this application belongs, unless otherwise explicitly defined herein. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
[0060] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification, where appropriate.
[0061] In a first aspect, referring to FIG. 1, the present application discloses a display screen correction method, comprising the following steps:
[0062] S1, obtaining theoretical PWM values PWM of a light source at different temperature points in a set temperature range A truth The set temperature range A is the temperature range in which the light source needs to maintain brightness;
[0063] S2, reading the gray scale value of the light source to obtain the brightness value Lvc that each color should display according to the read gray scale value;
[0064] S3, obtaining the PWM value PWM truth The PWM output value input into the light source driver is obtained according to the relationship between the brightness value and the PWM value in step S1 and the brightness value Lvc in step S2, and the light source is lit according to the PWM output value.
[0065] Step S1 is a process of obtaining correction parameters. The correction parameters can be calculated in real time or calculated in advance, and when correction is needed, they can be directly obtained. Through the above steps, the corresponding relationship between the brightness value and the PWM at each test temperature can be obtained, then the functional relationship between the two is fitted according to the corresponding relationship between the brightness value and the PWM, and finally the function is normalized with digital quantity, and the correction parameters are written into the parameter table, so as to continue the subsequent correction work.
[0066] The present application establishes the relationship between the theoretical PWM value and the brightness value at each temperature point, which is the correction parameter of the present correction method. Through the correction parameter, the brightness value and the PWM value generated by each gray scale can be directly calculated, so as to adjust the PWM output value and maintain the stability of the brightness of the display screen (such as LED display screen) in the temperature range in which the brightness needs to be maintained. Compared with the traditional correction method, the storage space required by the correction coefficient is reduced, the hardware cost is saved, the memory support during system operation is not needed, the start-up time can be greatly reduced, the waiting time during booting can be reduced, and the convenience is greatly improved.
[0067] Referring to FIG. 2, in some embodiments, before step S1, the following steps are included:
[0068] S1-1, selecting a set temperature point in the set temperature range A, and obtaining a driving current corresponding to the light source reaching the brightness white balance at the set temperature point, wherein the temperature range B covered by each driving current is [t1, t2];
[0069] At different temperature points in the temperature range B covered by each driving current, the maximum brightness value Lvc max of the light source under the temperature point corresponding driving current is tested out.
[0070] The relationship between the PWM value and the brightness value at different temperature points in the set temperature range A is obtained.
[0071] S1-2, obtaining the theoretical PWM value PWM max and the relationship between the brightness value according to the maximum brightness value Lvc truth .
[0072] Referring to FIG. 2, in some embodiments, the set temperature range A is [T1, T2], and in the step of selecting a set temperature point in the set temperature range A, the set temperature point selected in the set temperature range A is N, N is calculated by the formula:
[0073] N = (T2-T1) / t, calculated as,
[0074] wherein N is a positive integer, and t is the temperature gradient covered by the set driving current.
[0075] In some embodiments, the set temperature point is the maximum temperature point in the temperature range B covered by the driving current corresponding to the set temperature point.
[0076] Because the brightness of red changes greatly with temperature, if only one set temperature point is set as the driving current, the overall calculation accuracy will be reduced when the temperature changes greatly, therefore, the present application can take multiple set temperature points as needed, thereby improving the correction accuracy, and each set temperature point corresponds to a driving current.
[0077] The set temperature range A in which the display screen needs to maintain the brightness can be [T1, T2], T1 is the lowest temperature point, and T2 is the highest temperature point, T1 and T2 are set according to actual conditions, the value T of the set temperature range A is T2-T1, and T2≤95℃, the value of the temperature gradient covered by each driving current is t, the value of t can be adjusted according to actual conditions, t≥T / 2, the number of set temperature points N = T / t = (T2-T1) / t, and the value of N can be taken by the tail-cutting method, N is a positive integer.
[0078] When T / t is not divisible, the temperature range B covered by each driving current decreases by a temperature gradient t step by step from the highest temperature point T2.
[0079] In some embodiments, the setting temperature point is the maximum temperature point in the temperature range B covered by the driving current corresponding to the setting temperature point.
[0080] Because the brightness value decreases with the increase of temperature in the temperature range B covered by the same driving current, the brightness value of each temperature point is the maximum brightness value in the case of inputting the driving current, if the lowest temperature point in the temperature range B is taken as the setting temperature point, the brightness value of other temperature points higher than the temperature point cannot be increased to be consistent with the temperature value of the setting temperature point, so the maximum temperature point should be taken as the setting temperature point.
[0081] Taking the temperature range in which the brightness needs to be maintained as [-25℃, 75℃] as an example, if a driving current covers 30℃, the number N of setting temperature points to be selected is (75-(-25)) / 30, and after rounding off, N=3, and the three setting temperature points are 15℃, 45℃ and 75℃.
[0082] Referring to FIG. 2, in some embodiments, in step S1-2, the theoretical PWM value PWM truth The method for obtaining the relationship between the PWM value and the brightness value includes:
[0083] According to the maximum brightness value Lvc max , the theoretical PWM value PWM truth of each temperature point is calculated.
[0084] The function relationship between the theoretical PWM value PWM truth and the brightness value at each temperature point is fitted.
[0085] Referring to FIG. 2, in some embodiments, step S1-1 further includes: after the maximum brightness value Lvc max of the light source at the temperature point corresponding to the driving current is tested, the function relationship between Lvc max and the temperature is fitted, and the function relationship between Lvc max and the temperature is linear.
[0086] Specifically, the light source can include RGB three colors (the present application is not limited thereto, and other display screen primary colors are also within the protection scope of the present application), the relationship between the brightness value and the temperature of the RGB three colors under the driving current is relatively linear, and the dispersion is not high, and a first order function can be used for fitting.
[0087] Referring to FIG. 2, in some embodiments, in step S1-1, the method of obtaining the relationship between the PWM value and the luminance value at different temperature points in the set temperature range A includes: changing the proportion of the PWM value, measuring the PWM value PWMN and the luminance value LvcN at different temperature points in the set temperature range A, and obtaining the function relationship between PWMN and LvcN at different temperature points as follows:
[0088] PWMN = AN x LvcN + BN,
[0089] wherein AN and BN are parameters obtained by fitting, and AN ≠ 0.
[0090] Referring to FIG. 2, in some embodiments, according to the maximum luminance value Lvc max and the relationship between the PWM value and the luminance value, the theoretical PWM value PWM truth at different temperature points is calculated as follows:
[0091] According to the function relationship between Lvc max and temperature obtained by fitting, the proportion value KN between Lvc max at different temperature points and Lvc max at the first set temperature point higher than the temperature point is calculated, and then the theoretical PWM value PWM truth at different temperature points is obtained according to the proportion value KN and the function relationship between PWMN and the luminance value LvcN at different temperature points.
[0092] Referring to FIG. 2, in some embodiments, the calculation formula of the theoretical PWM value PWM truth at different temperature points obtained according to the proportion value KN and the function relationship between PWMN and the luminance value LvcN at different temperature points is as follows:
[0093] PWM truth = KN x PWMN.
[0094] The maximum luminance value Lvc max tested in step S1-1 is obtained under the condition that the proportion of the PWM value is 100%, that is, under the driving current corresponding to each set temperature point. For ease of understanding, the relationship between the obtained luminance value and temperature is shown in the following table:
[0095] In step S1-1, after changing the proportion of the PWM value, the function relationship between PWMN and LvcN at each temperature point is linear, which can be represented by a linear function as follows:
[0096] PWMN = AN x LvcN + BN,
[0097] AN and BN are parameters obtained by fitting, AN and BN are constants, and AN≠0.
[0098] And from the step S1-1 process, in the case of driving current, the brightness value in the temperature range required to maintain the brightness remains unchanged, then the corresponding brightness value of each temperature point and the corresponding brightness value of the set temperature point should have a proportional relationship, such as T7 is the set temperature point, the brightness of Lv7 at other temperatures should reach the proportion as shown in the following table:
[0099] Thus, the proportional value between the Lvc max of each temperature point and the Lvc max of the set temperature point can be obtained KN, thus the PWM truth =KN×PWMN,
[0100] Further, the corresponding relationship between PWM truth and LvcNis: PWM truth =KN×AN×LvcN+KN×BN,
[0101] Wherein, KN is a constant, and KN≠0.
[0102] Referring to FIG. 3 and FIG. 4, in some embodiments, in step S2, the method for obtaining the brightness value Lvc to be displayed of each color comprises:
[0103] According to the corresponding brightness value Lvg obtained by querying the Gamma table according to the gray scale value;
[0104] According to the brightness value Lvg, the brightness value Lvd of each color is calculated;
[0105] According to the brightness value Lvd, the brightness value Lvc to be displayed of each color is calculated.
[0106] Because the human eye's perception of brightness is not directly proportional to physical power, but a power function relationship, the exponent of this function is usually 2.2, called Gamma value. Therefore, the gray scale value in RGB needs to be corrected by Gamma, instead of directly corresponding to the power value, in order to consider the smaller storage range (0-255) and the more balanced light and dark proportion.
[0107] The Gamma table is a data table used for Gamma correction, which generates the RGB conversion data table by debugging software processing the measured data according to the set target Gamma value and color temperature.
[0108] Referring to FIG. 3 and FIG. 4, in some embodiments, in step S2, the calculation formula for calculating the brightness value Lvd of each color according to the brightness value Lvg is:
[0109] Lvd = K Lvs × K Lvd × Lvg,
[0110] wherein, K Lvs is the brightness ratio set by the master control, K Lvd is the brightness value ratio after the derating, K Lvs and K Lvd are constants, and K Lvs and K Lvd are not 0.
[0111] The brightness ratio set by the master control is the brightness ratio set by the correction personnel, which refers to the maximum brightness to be maintained within a certain temperature range, and the proportion coefficient is between [0, 1],
[0112] The brightness value ratio after the derating is the proportion value adjusted in the process of reducing the power consumption of the display screen as the temperature rises, and the proportion coefficient is between [0, 1]
[0113] Referring to FIGS. 3 and 4, in some embodiments, in step S2, the calculation formula for calculating the brightness value Lvc of each color to be displayed according to the brightness value Lvd is:
[0114] wherein, Lvd_R is the Lvd value of red, and Lvc_R is the brightness value of red to be displayed;
[0115] Lvd_G is the Lvd value of green, and Lvc_G is the brightness value of green to be displayed;
[0116] Lvd_B is the Lvd value of blue, and Lvc_B is the brightness value of blue to be displayed;
[0117] wherein, RR, RG, RB, GR, GG, GB, BR, BG, and BB are parameters of the set color temperature.
[0118] After obtaining the brightness values of RGB three colors, the brightness values of the three colors are multiplied by the parameters of the set color temperature to obtain the brightness values of each color to be displayed.
[0119] One of the best embodiments of the display screen correction method disclosed in the present application is as follows:
[0120] S1, set the set temperature range A of the light source to be maintained brightness as [T1, T2], and obtain the theoretical PWM value PWM truth and the relationship between the brightness value;
[0121] S1-1, selecting N set temperature points in the temperature range A, obtaining the driving current corresponding to the light source reaching the brightness white balance at the set temperature points, wherein each driving current covers a temperature range B [t1, t2], and the temperature ranges B covered by different driving currents are different;
[0122] N is calculated by the formula:
[0123] N = (T2-T1) / t, calculated,
[0124] Wherein, N is a positive integer, and t is the temperature gradient covered by the set driving current;
[0125] The set temperature point is the maximum temperature point in the temperature range B covered by the driving current corresponding to the set temperature point;
[0126] At different temperature points in the temperature range B covered by each driving current, the maximum brightness value Lvc of the light source under the driving current corresponding to the temperature point is tested max , the function relationship between Lvc max and temperature is fitted, and the function relationship between Lvc max and temperature is linear;
[0127] The proportion of the PWM value is changed, the PWM value PWMN and the brightness value LvcN at different temperature points in the set temperature range A are measured, and the function relationship formula of PWMN and LvcN at each temperature point is obtained:
[0128] PWMN = AN x LvcN + BN,
[0129] Wherein, AN and BN are parameters obtained by fitting, AN and BN are both constants, and AN ≠ 0;
[0130] Thus, the relationship between the PWM value and the brightness value at different temperature points in the set temperature range A is obtained;
[0131] S1-2, first, according to the maximum brightness value Lvc max and the relationship between the PWM value and the brightness value, the theoretical PWM value PWM truth at each temperature point is calculated, then according to the function relationship between Lvc max and temperature obtained by fitting, the proportion value KN between Lvc max at different temperature points and Lvc max at the first set temperature point higher than the temperature point is calculated, then according to the proportion value KN and the function relationship between PWMN and the brightness value LcvN at different temperature points, the theoretical PWM value PWM truth at each temperature point is obtained, and the relationship between the theoretical PWM value PWM truth and the brightness value is calculated, and the calculation formula is:
[0132] PWM truth = KN x PWMN;
[0133] S2, read the gray scale value of the light source, obtain the corresponding luminance value Lvg according to the gray scale value by querying the Gamma table, calculate the luminance value Lvd of each color according to the luminance value Lvg, and calculate the luminance value Lvc that should be displayed according to the luminance value Lvd;
[0134] The calculation formula for calculating the luminance value Lvd of each color according to the luminance value Lvg is:
[0135] Lvd = K Lvs x K Lvd x Lvg,
[0136] wherein, K Lvs is the main control setting luminance ratio, K Lvd is the luminance value ratio after derating,
[0137] K Lvs and K Lvd are both constants, 1≥K Lvs > 0, 1≥K Lvd > 0, and K Lvs and K Lvd are both not 0;
[0138] The calculation formula for calculating the luminance value Lvc that should be displayed according to the luminance value Lvd is:
[0139] wherein, Lvd_R is the Lvd value of red, and Lvc_R is the luminance value that should be displayed for red;
[0140] Lvd_G is the Lvd value of green, and Lvc_G is the luminance value that should be displayed for green;
[0141] Lvd_B is the Lvd value of blue, and Lvc_B is the luminance value that should be displayed for blue.
[0142] S3, according to the relationship between PWM truth and luminance value in step S1 and the luminance value Lvc in step S2, obtain the PWM output value input into the light source driver according to the PWM output value, and light up the light source according to the PWM output value.
[0143] After the application determines the set temperature range A in which the light source needs to maintain the brightness, in order to ensure the accuracy, N set temperature points are selected, a driving current is measured at each set temperature point, and the relationship between the maximum brightness value and the temperature of each temperature point in the temperature range B covered by each driving current is linear under the driving current. Then, the theoretical PWM value PWM of each temperature point is calculated in combination with the linear relationship between the PWM value and the brightness value of each temperature point. truth Therefore, the relationship between the theoretical PWM value and the brightness value at different temperature points is established as the correction parameter of the correction method, the brightness value and the PWM value generated by each gray scale can be directly calculated, the PWM output value is adjusted, the stability of the brightness of the display screen in the temperature range in which the brightness needs to be maintained is maintained, compared with the traditional correction method, the storage space required by the correction coefficient is reduced, the hardware cost is saved, the memory support during the system operation is not required, the start-up time can be greatly reduced, the waiting time during the start-up is reduced, and the convenience is greatly improved.
[0144] In a second aspect, the application further discloses a display screen system adopting the correction method of the display screen.
[0145] Referring to FIG. 5, the display screen system disclosed in the application includes a control unit, a display screen body 3, and a temperature detection unit 31 for collecting the ambient temperature. The temperature detection unit 31 is in communication connection with the control unit, and the control unit is in communication connection with the display screen body 3. The control unit adopts the correction method of the display screen and can correct the display screen body 3.
[0146] In some embodiments, the control unit includes a sending unit 1 and a receiving unit 2, and the receiving unit 2 can receive the temperature information detected by the temperature detection unit 31.
[0147] The receiving unit 2 includes a memory 21 and a processor 22. The memory 21 is used to store the correction parameters for correction. The memory 21 and the processor 22 are electrically connected. The temperature detection unit 31 is a temperature sensor 31 arranged on the display screen body 3. The temperature sensor is in communication connection with the processor 22.
[0148] The sending unit 1 inputs the picture to the receiving unit 2. The processor 22 processes the picture on the basis of the correction parameters input by the memory 21 and the temperature information transmitted by the temperature detection unit 31, and then outputs the PWM to the display screen body 3.
[0149] The display screen system applies the correction method of the display screen to perform the brightness correction. The correction parameters are saved in the memory 21. The temperature is checked every frame to update the correction parameters in real time. The calculation process is performed in the processor 22.
[0150] In a third aspect, the application also discloses a car adopting the display screen system.
[0151] So far, the embodiments of the application have been described in detail. In order to avoid obscuring the concept of the application, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.
[0152] Although some specific embodiments of the application have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the application. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be replaced equivalently without departing from the scope and spirit of the application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.
Claims
1. A method of correcting a display screen, characterized by, Comprising the following steps: S1, acquiring theoretical PWM values PWM of the light source at different temperature points in a set temperature range A truth in relation to the luminance value, the set temperature range A being a temperature range in which the light source needs to maintain luminance; S2, reading the gray scale value of the light source to obtain the brightness value Lvc that each color should display according to the read gray scale value; S3. PWM according to step S1 truth The relationship with the luminance value and the luminance value Lvc in step S2 results in a PWM output value which is input into the light source drive and according to which the light source is illuminated.
2. The display screen correction method according to claim 1, wherein Before the step S1, comprising: S1-1, selecting a set temperature point in the set temperature range A, and obtaining the driving current corresponding to the brightness white balance of the light source at the set temperature point, wherein the temperature range B covered by each driving current is [t1, t2]; at different temperature points within the temperature range B covered by each of the driving currents, test the maximum luminance value Lvc of the light source at the temperature point corresponding driving current max ; Obtaining the relationship between the PWM value and the brightness value at different temperature points in the set temperature range A; S1-2, based on the maximum luminance value Lvc max and the relationship between the PWM value and the luminance value, the theoretical PWM value PWM truth and the relationship between the PWM value and the luminance value.
3. The display screen correction method according to claim 2, wherein The set temperature range A is [T1, T2], and in the step of selecting a set temperature point in the set temperature range A, the set temperature point selected in the set temperature range A is N, and the N is calculated by the formula: N=(T2-T1) / t, calculated, Wherein, N is a positive integer, and t is the temperature gradient covered by the set driving current.
4. The display screen correction method of claim 2, wherein The set temperature point is the maximum temperature point in the temperature range B covered by the driving current corresponding to the set temperature point.
5. The display screen correction method of claim 2, wherein, In the step S1-2, the theoretical PWM value PWM truth The method for determining the relationship with the luminance value comprises: According to the maximum luminance value Lvc max The theoretical PWM value PWM of each temperature point is calculated according to the relationship between the PWM value and the luminance value truth ; The theoretical PWM value PWM is obtained by fitting the measured PWM values at each temperature point truth in relation to the luminance value.
6. The display screen correction method according to claim 5, wherein Step S1-1 further includes: testing the maximum brightness value Lvc of the light source at the corresponding driving current at the temperature point. max Then, Lvc was obtained through fitting. max The functional relationship between Lvc and temperature, the Lvc max The functional relationship between temperature and temperature is linear.
7. The display screen correction method of claim 5, wherein In the step S1-1, the method for obtaining the relationship between the PWM value and the brightness value at different temperature points in the set temperature range A comprises: changing the proportion of the PWM value, measuring the PWM value PWMN and the brightness value LvcN at different temperature points in the set temperature range A, and obtaining the function relationship formula of PWMN and LvcN at different temperature points as: PWMN=AN×LvcN+BN, Wherein, AN and BN are parameters obtained by fitting, and AN≠0.
8. The display screen correction method of claim 7, wherein, The maximum luminance value Lvc max The theoretical PWM value PWM of different temperature points is calculated according to the relationship between the PWM value and the luminance value truth comprises: According to the Lvc obtained from the fitting max The functional relationship between temperature and Lvc is calculated at different temperature points. max Lvc above the first set temperature point max The ratio KN between the two is used to determine the theoretical PWM value PWM at different temperature points. Then, based on the functional relationship between the ratio KN and the PWMN and luminance value LcvN at different temperature points, the theoretical PWM value PWM at each temperature point is obtained. truth .
9. The display screen correction method according to claim 8, wherein The theoretical PWM value PWM of different temperature points is obtained according to the proportional value KN and the functional relationship of PWMN and the brightness value LvcN at different temperature points truth The calculation formula is: PWM truth = KN x PWMN.
10. The method of correction of a display according to any one of claims 1 to 9, characterized in that, In the step S2, the method for obtaining the brightness value Lvc that each color should display comprises: The corresponding brightness value Lvg obtained by querying the Gamma table according to the gray scale value; Calculating the brightness value Lvd of each color according to the brightness value Lvg; According to the brightness value Lvd, the brightness value Lvc that each color should display is calculated.
11. The display screen correction method of claim 10, wherein, The calculation formula of the luminance value Lvd of each color according to the luminance value Lvg in the step S2 is: Lvs ×K Lvd ×Lvg, Wherein, K Lvs is the brightness ratio set by the master Lvd is the brightness value ratio after the reduction K Lvs K Lvd K Lvs K Lvd K 12. The display screen correction method of claim 10, wherein, In the step S2, the calculation formula of the luminance value Lvc to be displayed for each color according to the luminance value Lvd is: Wherein, Lvd_R is the Lvd value of red, and Lvc_R is the brightness value that red should display; Lvd_G is the Lvd value of green, and Lvc_G is the brightness value that green should display; Lvd_B is the Lvd value of blue, and Lvc_B is the brightness value that blue should display.
13. A display screen system, characterized by The display screen system adopts the display screen correction method of any one of claims 1-12.
14. The display screen system of claim 13, wherein, Comprising a control unit, a display screen body (3), and a temperature detection unit (31) for collecting the ambient temperature, the temperature detection unit (31) is in communication connection with the control unit, the control unit is in communication connection with the display screen body (3), the control unit adopts the display screen correction method of any one of claims 1-9, and can correct the display screen body (3).
15. An automobile characterized by comprising: The display screen system adopts the display screen system of claim 13 or 14.