CN111179817A - Method and device for eliminating brightness difference of display screen - Google Patents
Method and device for eliminating brightness difference of display screen Download PDFInfo
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- CN111179817A CN111179817A CN202010106607.3A CN202010106607A CN111179817A CN 111179817 A CN111179817 A CN 111179817A CN 202010106607 A CN202010106607 A CN 202010106607A CN 111179817 A CN111179817 A CN 111179817A
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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]
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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
Abstract
The invention provides a method and a device for eliminating brightness difference of a display screen, wherein the method comprises the following steps: obtaining sample boxes of various models to form box samples; respectively establishing a lamp point brightness matrix model for each model of sample box body; performing cold screen correction on the target correction box body; generating a hot screen correction coefficient of the target correction box body according to the cold screen correction coefficient and a lamp point brightness matrix model corresponding to the target correction box body; and adjusting the brightness of each lamp point in the target correction box according to the heat shield correction coefficient. The device comprises a box cold screen correction module, a lamp point brightness matrix model creation module, a box model identification module, a box hot screen correction coefficient calculation module and a box hot screen correction module. The method and the device for eliminating the brightness difference of the display screen can realize the hot screen correction of the box body of the display screen without a preheating process, thereby eliminating the brightness difference of the display screen.
Description
Technical Field
The invention relates to the field of display screens, in particular to a method and a device for eliminating brightness difference of a display screen.
Background
In an LED display screen, the difference in screen display brightness due to the uneven temperature distribution of the screen body is referred to as a "cross-hair" phenomenon in the industry.
At present, in prior art, adopt two kinds of modes to rectify the LED display screen usually, one kind is cold screen correction, when carrying out cold screen correction, the box temperature in the LED display screen is generally less than actual operating temperature, because the temperature is not enough this moment, when gathering the lamp lightening data of LED display screen and just proofreading, can't gather "cross line" relevant data, consequently when LED display screen in-service use, still can appear "cross line" phenomenon. Another correction method in the prior art is heat shield correction, which needs to add a preheating link before correction and then correct according to collected lamp point brightness data in a box body, so that the cross line phenomenon can be effectively improved, but the production efficiency is reduced due to the fact that the preheating takes longer time and the working procedures are added; moreover, the preheating degree of each box body is difficult to be ensured to be consistent in the actual production link, and a new error is introduced.
Disclosure of Invention
In order to improve the production efficiency and effectively improve the cross line phenomenon, namely effectively eliminate the brightness difference of the LED display screen, the invention provides a method for eliminating the brightness difference of the display screen, which comprises the following steps: obtaining sample boxes of various models to form box samples; respectively establishing a lamp point brightness matrix model for each type of sample box body according to a cold screen lamp point brightness graph and a hot screen lamp point brightness graph of the sample box body; acquiring a cold screen correction coefficient according to a cold screen lamp point brightness image of the target correction box body, and performing cold screen correction on the target correction box body; obtaining the model of the target correction box body according to the box body information of the target correction box body, and obtaining a lamp point brightness matrix model corresponding to the target correction box body according to the model; generating a hot screen correction coefficient of the target correction box body according to the cold screen correction coefficient and a lamp point brightness matrix model corresponding to the target correction box body; and adjusting the brightness of each lamp point in the target correction box according to the heat shield correction coefficient.
Further, according to the cold-screen light spot brightness map and the hot-screen light spot brightness map of the sample box body, respectively establishing a light spot brightness matrix model for each type of box body comprises: obtaining a box body of one model from a sample box body, and executing the following steps of establishing a lamp point brightness matrix model: the method comprises the steps of lighting a model box body from a black screen state, and collecting a cold screen lamp lighting brightness map; preheating the temperature of the model box body to a stable working temperature, and collecting a point brightness graph of the heat shield lamp; generating a lamp point brightness matrix of the box body in the model number according to the cold screen lamp point brightness graph and the hot screen lamp point brightness graph; filtering the lamp point brightness matrix, and creating a lamp point brightness matrix model corresponding to the model box body; and acquiring the box body of the next model from the sample box body, and repeatedly executing the step of establishing the lamp point brightness matrix model until the corresponding lamp point brightness matrix model is established for each model of box body in the sample box body.
Further, the filtering of the lamp point brightness matrix is as follows: performing reassignment on the brightness of the lamp points in the lamp point brightness matrix one by one, wherein the brightness values of the preset lamp points around the lamp point waiting for reassignment as the center are obtained; calculating the average value of the brightness values of the preset lamp points; the average value is taken as the brightness value of the lamp point waiting for reassignment.
Further, generating the lamp point brightness matrix of the model box according to the cold screen lamp point brightness graph and the hot screen lamp point brightness graph comprises: scanning a cold screen lamp point brightness graph to obtain cold screen brightness values of lamp points at different positions in the model box body; scanning a heat shield lamp point brightness graph to obtain heat shield brightness values of lamp points at different positions in the model box body; and dividing the cold screen brightness value by the hot screen brightness value to obtain the brightness values of the lamp points at different positions, and generating a lamp point brightness matrix of the box body of the model.
Furthermore, in the sample box body, the number of box bodies of each type is multiple, and the collected cold screen lamp point brightness graph is a cold screen brightness graph obtained by collecting a plurality of box bodies of the same type; the collection of the point brightness images of the heat shield lamps is the collection of the heat shield brightness images of a plurality of box bodies with the same model.
Further, according to the cold screen lamp point luminance graph and the hot screen lamp point luminance graph, a lamp point luminance matrix of the type box body is generated, and the method comprises the following steps: acquiring cold screen lamp point brightness graphs and hot screen lamp point brightness graphs of a plurality of box bodies of the same type; scanning a plurality of cold screen lamp point brightness graphs to obtain cold screen brightness values of lamp points at different positions on the cold screen lamp point brightness graphs, wherein the lamp point at each position corresponds to the plurality of cold screen brightness values, and taking the median of the plurality of cold screen brightness values as the cold screen brightness value of the lamp point at each position; scanning a plurality of heat shield lamp point brightness graphs to obtain heat shield brightness values of lamp points at different positions on the heat shield lamp point brightness graphs, wherein the lamp point at each position corresponds to the plurality of heat shield brightness values, and taking the median of the plurality of heat shield brightness values as the heat shield brightness value of the lamp point at each position; and dividing the cold screen brightness value by the hot screen brightness value to obtain the brightness value of the lamp point at each position, and generating a lamp point brightness matrix of the box body of the model.
Further, the step of creating the lamp luminance matrix model for each model of the box body includes the steps of creating the lamp luminance matrix model for each model of the box body at different temperatures, respectively, and including: obtaining a box body of one model from a sample box body, and executing the following steps of establishing a lamp point brightness matrix model: the method comprises the steps of lighting a model box body from a black screen state, and collecting a cold screen lamp lighting brightness map; preheating the temperature of the box body of the model, and collecting a point brightness graph of the heat shield lamp at different temperatures; generating lamp point brightness matrixes of the type box body at different temperatures according to the cold screen lamp point brightness graph and the hot screen lamp point brightness graph at different temperatures; filtering the lamp point brightness matrixes of the model box bodies at different temperatures, and creating corresponding lamp point brightness matrix models of the model box bodies at different temperatures; and acquiring the box body of the next model from the sample box body, and repeatedly executing the step of establishing the lamp point brightness matrix model until the lamp point brightness matrix model corresponding to different temperatures is established for each model of box body in the sample box body.
Further, obtaining the lamp spot brightness matrix model corresponding to the target correction box according to the model further includes: and obtaining the current temperature of the target correction box body, and calculating a lamp point brightness matrix model corresponding to the target correction box body at the current temperature by adopting an interpolation method according to lamp point brightness models which are created at different temperatures and correspond to the box bodies of different models.
Further, generating the lamp point brightness matrix of the model box body at different temperatures according to the cold screen lamp point brightness graph and the hot screen lamp point brightness graph at different temperatures comprises: scanning a cold screen lamp point brightness graph to obtain the cold screen brightness value of each lamp point in the model box body; scanning the heat shield lamp point brightness graphs at different temperatures to obtain the heat shield brightness values of all lamp points in the model box body at different temperatures; and dividing the hot screen brightness value by the cold screen brightness value to obtain the corresponding brightness values of the lamp points at different temperatures, and generating a lamp point brightness matrix of the model box body at different temperatures.
The invention also provides a device for eliminating the brightness difference of the display screen, which comprises a box cold screen correction module, a lamp point brightness matrix model creation module, a box model identification module, a box hot screen correction coefficient calculation module and a box hot screen correction module, wherein: the box body cold screen correction module is connected with the box body hot screen correction coefficient calculation module and used for obtaining a cold screen correction coefficient of the target box body according to a cold screen brightness image of the target correction box body and carrying out cold screen correction on the target correction box body; the lamp point brightness matrix model creating module is connected with the box body heat screen correction coefficient calculating module and is used for creating a corresponding lamp point brightness matrix model for each type of box body; the box type identification module is connected with the box heat screen correction coefficient calculation module and used for identifying the type of the target box according to the box information of the target box; the box body heat screen correction coefficient calculation module is connected with the box body cold screen correction module, the lamp point brightness matrix model creation module, the box body model identification module and the box body heat screen correction module and is used for acquiring a lamp point brightness matrix model corresponding to the target box body according to the model of the target box body and calculating a heat screen correction coefficient according to the cold screen correction coefficient and the lamp point brightness matrix model; and the box body heat screen correction module is connected with the box body heat screen correction coefficient calculation module and is used for correcting the brightness of each lamp point in the target box body according to the heat screen correction coefficient.
According to the method for eliminating the brightness difference of the display screen, the lamp point brightness matrix model is established for each type of box body, so that the heat screen correction coefficient of the box body to be corrected is calculated according to the lamp point brightness matrix model, the effect of heat screen correction is superposed after cold screen correction is carried out on the box body, the box body can realize accurate heat screen correction without a preheating process, the problem of the brightness difference of the display screen is eliminated by carrying out the operation on all the box bodies in the display screen one by one, the cross line phenomenon of the screen is effectively improved, and the production efficiency is improved.
The invention also provides a device for eliminating the brightness difference of the display screen, which realizes the correction of the box body of the display screen by adopting the method, thereby effectively eliminating the brightness difference of the display screen, and can improve the working efficiency and reduce the cost because a preheating link is not needed.
Drawings
FIG. 1 is a flowchart illustrating a method for eliminating brightness difference of a display screen according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating steps for creating a lamp spot luminance matrix model according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating the steps for reassigning the luminances of the lamp points in the lamp point luminance matrix according to one embodiment of the present invention;
FIG. 4 is a flowchart illustrating the steps of generating a lamp luminance matrix for the model case according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating steps for creating a lamp spot luminance matrix model according to another embodiment of the present invention;
FIG. 6 is a block diagram of an apparatus for eliminating brightness differences of a display panel according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a lamp point luminance matrix model creation module according to an embodiment of the present invention;
wherein: 401-box cold screen correction module, 402-lamp point brightness matrix model creation module, 403-box model identification module, 404-box hot screen correction coefficient calculation module, 405-box hot screen correction module, 4021-lamp point brightness graph acquisition unit, 4022-lamp point brightness matrix creation unit and 4023-filtering unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In an embodiment of the present invention, a method for eliminating brightness difference of a display screen is provided, as shown in fig. 1, the method includes the following steps:
step S101: and obtaining sample boxes of various models to form box samples.
The LED display screen is formed by splicing a plurality of boxes, the boxes have various models, the brightness of lamp points of the boxes of each model is different at the actual working temperature, and the correction coefficients used in correction are different, so that when the boxes of the display screen are corrected to eliminate the brightness difference of the display screen, the corresponding correction coefficients are adopted according to the models of the boxes forming the display screen. In the step, sample boxes of various models are obtained to serve as box samples, and difference correction is carried out according to the box models when boxes in the display screen are corrected subsequently, so that the problem of brightness difference of the corrected display screen does not occur any more.
Step S102: and respectively establishing a lamp point brightness matrix model for each model of sample box according to the cold screen lamp point brightness graph and the hot screen lamp point brightness graph of the sample box.
The cold screen lamp luminance map of the sample box refers to a lamp luminance map obtained when the sample box is lit from a black screen, and the hot screen lamp luminance map of the sample box refers to a lamp luminance map obtained after the sample box is preheated. Specifically, the sample box body internally comprises a plurality of lamp points which are arranged in an array, the brightness value of each lamp point in the lamp point array is measured after the box body is lightened from a black screen state, and a cold screen lamp point brightness graph is generated according to the brightness values of the lamp points; and measuring the brightness value of each lamp point in the lamp point array after the box body is preheated, and generating a heat shield lamp point brightness graph according to the brightness value of the lamp point at the moment. The lamp brightness map is a three-dimensional graph, and if the coordinates of each point in the map are represented by (x, y, l), where x and y represent the position of the lamp in the lamp array, and l represents the brightness value of the lamp at the position.
The lamp brightness matrix model refers to the difference of the brightness distribution of the lamp array at different temperatures (the cold shield state temperature and the hot shield state temperature), and can also be represented by a three-dimensional graph, if the coordinates of each point in the graph are represented by (x, y, l), where x and y represent the position of the lamp in the lamp array, and l represents the difference of the brightness distribution of the lamp at the position at different temperatures (the cold shield state temperature and the hot shield state temperature). The brightness distribution difference is the difference between the brightness value of the lamp in the cold screen state and the brightness value of the lamp in the hot screen state.
Step S103: and acquiring a cold screen correction coefficient according to a cold screen lamp point brightness image of the target correction box body, and performing cold screen correction on the target correction box body.
Specifically, the target correction box refers to a box which needs to be corrected, namely, a box in the display screen which needs to eliminate display brightness difference. And obtaining a cold screen correction coefficient according to a cold screen lamp point brightness image of the target correction box, namely obtaining the cold screen correction coefficient of each lamp point according to the brightness value of each lamp point of the target correction box in a cold screen state and a preset correction standard, correcting the target correction box according to the cold screen correction coefficient, and adjusting the brightness value of each lamp point.
Step S104: and obtaining the model of the target correction box body according to the box body information of the target correction box body, and obtaining a lamp point brightness matrix model corresponding to the target correction box body according to the model.
The box information of the target correction box mainly includes information such as a box model and a box size, the model of the target correction box is obtained from the information, and the lamp luminance matrix model corresponding to the box of the model created in the step S102 is obtained according to the model of the target correction box.
Step S105: and generating a hot screen correction coefficient of the target correction box body according to the cold screen correction coefficient and the lamp point brightness matrix model corresponding to the target correction box body.
Step S106: and adjusting the brightness value of each lamp point in the target correction box according to the heat shield correction coefficient.
According to the method, firstly, a lamp point brightness matrix model is established for each type of box body, when the target correction box body is corrected, the type of the target correction box body is obtained, and the lamp point brightness matrix model corresponding to the previously established type of box body is obtained according to the type of the target correction box body. Furthermore, firstly, cold screen correction is carried out on the target correction box body, then, a hot screen correction coefficient is calculated according to the cold screen correction coefficient and the lamp point brightness matrix model, and hot screen correction is carried out on the lamp points of the target correction box body according to the hot screen correction coefficient, so that the target correction box body can obtain the effect of hot screen correction without preheating. By using the method for eliminating the brightness difference of the display screen, only a small number of sample box bodies need to be preheated, and each box body needing to be corrected does not need to be preheated one by one, so that the temperature control is more accurate than that of a large number of preheating correction methods. And the correction time can be obviously shortened, and the correction efficiency is improved. On the other hand, preheat the box and need use high accuracy thermal imager, if all preheat the target correction box, in order to guarantee efficiency, need use a large amount of high accuracy thermal imagers simultaneously, increase cost, and high accuracy thermal imager is inconvenient to be popularized in the mill, and this scheme of use then only needs purchase the high accuracy thermal imager a small amount, be used for preheating the sample box, can gain the effect of good heat shield correction when reduce cost.
In another embodiment of the present invention, the creating a lamp luminance matrix model for each model of the sample box according to the cold-screen lamp luminance map and the hot-screen lamp luminance map of the sample box respectively comprises: obtaining a model box from the sample box, as shown in fig. 2, executing the following steps of creating a lamp spot brightness matrix model:
step S1021: lighting the box body of the model from a black screen state, and collecting a cold screen lamp lighting brightness map; the temperature of the box body with the type is preheated to a stable working temperature, and a point brightness graph of the heat shield lamp is collected.
Specifically, the stable operating temperature refers to a relatively stable temperature value that the tank body reaches in a normal operating state.
Step S1022: and generating a lamp point brightness matrix of the box body of the model according to the cold screen lamp point brightness graph and the hot screen lamp point brightness graph.
Specifically, the brightness distribution difference of each lamp point of the target correction box at different temperatures (i.e., the cold shield state temperature and the hot shield state temperature) is calculated according to the cold shield lamp point brightness value of each lamp point of the target correction box in the cold shield state and the hot shield lamp point brightness value of each lamp point in the hot shield state, and specifically, the brightness distribution difference of each lamp point at the same temperature (i.e., the cold shield state temperature and the hot shield state temperature) is represented by a brightness value. And generating a three-dimensional stereo map according to the position of each lamp point in the lamp point matrix and the brightness distribution difference of each lamp point at different temperatures (namely the cold screen state temperature and the hot screen state temperature), wherein if the coordinates of each point in the three-dimensional stereo map are represented by (x, y, l), (x, y) represents the position coordinates of the lamp point in the lamp point array, and l is the brightness distribution difference of the lamp point at different temperatures (namely the cold screen state temperature and the hot screen state temperature) and is represented by a brightness value, and the brightness value is calculated according to the cold screen lamp point brightness value and the hot screen lamp point brightness value of the lamp point. The generated three-dimensional stereo image is a lamp point brightness matrix.
Step S1023: and filtering the lamp point brightness matrix, and creating a lamp point brightness matrix model corresponding to the model box body.
The lamp point brightness matrix is filtered, so that the influence of individual difference among different lamp points on the lamp point brightness can be eliminated, and a final lamp point brightness matrix model is obtained. Specifically, the lamp point luminance matrix may be filtered by using a mean filtering method.
And acquiring the box body of the next model from the sample box body, and repeatedly executing the step of establishing the lamp point brightness matrix model until the corresponding lamp point brightness matrix model is established for each model of box body in the sample box body. Specifically, in practical application, boxes of various models can be numbered, and the boxes of various models can be acquired one by one according to the numbers, so that the operation of creating the lamp point brightness matrix model is performed.
Further, in another embodiment of the present invention, the lamp luminance matrix is filtered as follows: and reassigning the brightness of the lamp points in the lamp point brightness matrix one by one.
As shown in fig. 3, the method comprises the following steps:
step S10231: the brightness values of the surrounding preset lamp points centered on the lamp point waiting for reassignment are acquired.
The brightness values of the lamp points in the lamp point brightness matrix can be filtered by using a mean filtering method, and specifically, the brightness values of 8 lamp points around the lamp point waiting for reassignment are obtained by taking the lamp point waiting for reassignment as a center.
Step S10232: calculating the average value of the brightness values of the preset lamp points;
in the present embodiment, the preset number of lamp points refers to 8 lamp points around the lamp point waiting for reassignment. For convenience of understanding, taking a 3 × 3 matrix as an example, the lamp point at the center of the matrix is the lamp point waiting for reassignment, and 8 lamp points other than the center lamp point are the preset lamp points mentioned in this embodiment.
Step S10233: the average value is taken as the brightness value of the lamp point waiting for reassignment.
Through the steps, the brightness value of each lamp point in the lamp point brightness matrix is adjusted one by one, and the influence of individual difference between the lamp points on the brightness difference of the lamp points at different temperatures (namely the cold screen state temperature and the hot screen state temperature) is eliminated. Therefore, the finally obtained lamp point brightness matrix model is more accurate.
Further, in another embodiment of the present invention, the generating the lamp luminance matrix of the model box according to the cold-screen lamp luminance map and the hot-screen lamp luminance map comprises: scanning a cold screen lamp point brightness graph to obtain cold screen brightness values of lamp points at different positions in the model box body; scanning a heat shield lamp point brightness graph to obtain heat shield brightness values of lamp points at different positions in the model box body; calculating the brightness distribution difference of each lamp point at different temperatures (i.e. the cold screen state temperature and the hot screen state temperature), specifically, dividing the hot screen brightness value of the lamp point by the cold screen brightness value of the lamp point to obtain the brightness distribution difference of the lamp point at different temperatures (i.e. the cold screen state temperature and the hot screen state temperature), and expressing the brightness distribution difference by using brightness values. And generating a lamp point brightness matrix of the box body type according to the brightness value (brightness distribution difference) of each lamp point and the position of each lamp point in the lamp point matrix.
Further, in another embodiment of the present invention, there are a plurality of sample boxes of each type, and the collected cold-screen light point luminance graph is a cold-screen light point luminance graph obtained by collecting a plurality of boxes of the same type; the collected heat shield lamp point brightness graph is a heat shield lamp point brightness graph which collects a plurality of box bodies with the same model.
In this embodiment, there are a plurality of sample boxes of each type, and when a lamp spot brightness matrix model of a sample box of each type is subsequently created, the brightness distribution differences of a plurality of sample boxes of the same type at different temperatures (i.e., the cold screen state temperature and the hot screen state temperature) can be integrated, so as to obtain a more accurate lamp spot brightness matrix model. Preferably, the number of sample containers is 10 for each model.
Further, in another embodiment of the present invention, a lamp luminance matrix of the model box is generated according to the cold-screen lamp luminance graph and the hot-screen lamp luminance graph, as shown in fig. 4, the steps include:
step S201: acquiring cold screen lamp point brightness graphs and hot screen lamp point brightness graphs of a plurality of box bodies of the same type;
step S202: and scanning the plurality of cold screen lamp point brightness graphs to obtain cold screen brightness values of the lamp points at different positions on the cold screen lamp point brightness graph.
The lamp point at each position corresponds to a plurality of cold screen brightness values, and the median of the cold screen brightness values is taken as the cold screen brightness value of the lamp point at each position;
step S203: and scanning the plurality of heat shield lamp point brightness graphs to obtain the heat shield brightness values of the lamp points at different positions on the heat shield lamp point brightness graphs.
The lamp point at each position corresponds to a plurality of heat shield brightness values, and the median of the plurality of heat shield brightness values is taken as the heat shield brightness value of the lamp point at each position;
step S204: and dividing the cold screen brightness value by the hot screen brightness value to obtain the brightness value of the lamp point at each position, and generating the lamp point brightness matrix of the box body of the model.
In this embodiment, when calculating the cold screen brightness value and the hot screen brightness value of the lamp, the median of the cold screen brightness values of the lamp at the same position of the multiple sample boxes of the same type is taken as the final cold screen brightness value of the lamp at the position, the median of the hot screen brightness values of the lamp at the same position of the multiple sample boxes of the same type is taken as the final hot screen brightness value of the lamp at the position, and then the brightness distribution difference of the lamp at the different temperatures at the position, that is, the brightness value mentioned above, is calculated according to the final cold screen brightness value and the hot screen brightness value of the lamp at the position. The brightness values (brightness distribution difference) of the lamp points at each position are calculated one by one according to the method, and the positions of the lamp points in the lamp point matrix are combined to obtain a final lamp point brightness matrix model, so that the obtained lamp point brightness matrix model is more accurate.
Further, in another embodiment of the present invention, the creating of the lamp luminance matrix model for each model of the housing respectively is that the creating of the lamp luminance matrix model for each model of the housing at different temperatures respectively comprises the steps of:
obtaining a model box from the sample box, as shown in fig. 5, executing the following steps of creating a lamp spot brightness matrix model:
step S301: lighting the box body of the model from a black screen state, and collecting a cold screen lamp lighting brightness map;
step S302: preheating the temperature of the box body of the model, and collecting the point brightness graphs of the heat shield lamps at different temperatures;
specifically, the different temperatures in this step refer to preheating the box after the box is lit up from the black screen, so that the box temperature reaches a plurality of preset temperatures in the process of stable working temperature, which can be set and determined by a technician in actual calibration work, taking the stable working temperature as 50 ℃, as an example, the preset temperatures can be 30 ℃, 40 ℃, 45 ℃ and 50 ℃. Of course, in actual operation, other preset temperatures may be selected, and the invention is not limited thereto.
Step S303: and generating a lamp point brightness matrix of the model box body at different temperatures according to the cold screen lamp point brightness graph and the hot screen lamp point brightness graph at different temperatures.
Specifically, the lamp spot brightness matrix of the model box body at 40 ℃ can be generated according to the cold screen lamp spot brightness graph and the hot screen lamp spot brightness graph at 40 ℃, and the lamp spot brightness matrix of the model box body at 45 ℃ and the like can be generated according to the cold screen lamp spot brightness graph and the hot screen lamp spot brightness graph at 45 ℃.
Step S304: and filtering the lamp point brightness matrix of the model box body at different temperatures, and establishing a lamp point brightness matrix model corresponding to the model box body at different temperatures.
The filtering method has been described in detail above, and will not be described in detail herein.
And acquiring the box body of the next model from the sample box body, and repeatedly executing the step of establishing the lamp point brightness matrix model until the lamp point brightness matrix model corresponding to different temperatures is established for each model of box body in the sample box body.
Further, in another embodiment of the present invention, the obtaining the lamp point brightness matrix model corresponding to the target calibration box according to the model number further includes: and obtaining the current temperature of the target correction box body, and calculating a lamp point brightness matrix model corresponding to the target correction box body at the current temperature by adopting an interpolation method according to the lamp point brightness models which are created at different temperatures and correspond to the box bodies of the types. In the above embodiment, a plurality of lamp luminance matrix models at different temperatures are created for each type of box, and in this embodiment, the lamp luminance matrix model corresponding to the current temperature can be obtained by interpolation using the lamp luminance matrix models at different temperatures. And subsequently, the brightness of the lamp beads in the box body can be corrected according to the lamp point brightness matrix model corresponding to the box body at the current temperature.
By the method, the real-time brightness correction of the box body at different temperatures can be realized, and the brightness correction of the box body at the working temperature is not limited.
Further, in another embodiment of the present invention, the generating the lamp luminance matrix of the model box at different temperatures according to the cold-screen lamp luminance graph and the hot-screen lamp luminance graphs at different temperatures includes: scanning a cold screen lamp point brightness graph to obtain the cold screen brightness value of each lamp point in the box body of the model; scanning the heat shield lamp point brightness maps at different temperatures to obtain the heat shield brightness values of all lamp points in the model box body at different temperatures; and dividing the hot screen brightness value by the cold screen brightness value to obtain the brightness distribution difference of the corresponding lamp points at different temperatures, and generating a lamp point brightness matrix of the model box body at different temperatures.
Specifically, the generation method of the lamp luminance matrix at each temperature is the same, taking the generation of the lamp luminance matrix at 40 ℃ as an example, firstly, the cold screen lamp luminance map of the box body of the type and the hot screen lamp luminance map at 40 ℃ are scanned to obtain the cold screen luminance value and the hot screen luminance value of each lamp, the hot screen luminance value of one lamp is divided by the cold screen luminance value of the lamp to obtain a luminance value, and the above operations are repeated to obtain the luminance values of all the lamps in the box body, where the luminance values are the luminance distribution differences of the lamps at different temperatures (the temperature corresponding to the cold screen state and 40 ℃). And generating a lamp point brightness matrix according to the brightness distribution difference of the lamp points at different temperatures (the temperature corresponding to the cold screen state and 40 ℃) and the positions of the lamp points.
The invention also provides a device for eliminating the brightness difference of a display screen, as shown in fig. 6, the device comprises a box cold screen correction module 401, a lamp spot brightness matrix model creation module 402, a box model identification module 403, a box hot screen correction coefficient calculation module 404 and a box hot screen correction module 405, wherein: the box body cold screen correction module 401 is connected with the box body hot screen correction coefficient calculation module 404 and is used for acquiring a cold screen correction coefficient of a target box body according to a cold screen brightness image of the target correction box body and performing cold screen correction on the target correction box body; a lamp point brightness matrix model creating module 402, connected to the box body heat shield correction coefficient calculating module 404, for creating a corresponding lamp point brightness matrix model for each type of box body; the box type identification module 403 is connected with the box heat shield correction coefficient calculation module 404 and is used for identifying the type of the target box according to the box information of the target box; a box body heat shield correction coefficient calculation module 404, connected to the box body cold shield correction module 401, the lamp spot brightness matrix model creation module 402, the box body model identification module 403, and the box body heat shield correction module 405, for obtaining a lamp spot brightness matrix model corresponding to the target box body according to the model of the target box body, and calculating a heat shield correction coefficient according to the cold shield correction coefficient and the lamp spot brightness matrix model; the box heat shield correction module 405 is connected to the box heat shield correction coefficient calculation module 404, and is configured to correct the brightness of each lamp point in the target box according to the heat shield correction coefficient.
Further, in another embodiment of the present invention, as shown in fig. 7, the lamp luminance matrix model creating module 402 includes a lamp luminance map obtaining unit 4021, a lamp luminance matrix creating unit 4022, and a filter unit 4023. The lamp point brightness map obtaining unit 4021 is configured to obtain a cold-screen lamp point brightness map and a hot-screen lamp point brightness map corresponding to the sample box. The lamp luminance matrix creating unit 4022 is connected to the lamp luminance map acquiring unit 4021, and is configured to create the lamp luminance matrix according to the cold-screen lamp luminance map and the hot-screen lamp luminance map. The filtering unit 4023 is connected to the lamp luminance matrix creating unit 4022, and is configured to filter the created lamp luminance matrix, thereby creating a lamp luminance matrix model.
The device for eliminating the brightness difference of the display screen provided in the embodiment uses the sample box bodies of each model to create the lamp spot brightness matrix model, and when the box bodies in the display screen are corrected, the cold screen correction is firstly carried out, and then the effect of the hot screen correction is superposed according to the lamp spot brightness matrix model, so that the brightness difference of the display screen is eliminated, and the problem of cross lines is solved.
The terms and expressions used in the specification of the present invention have been set forth for illustrative purposes only and are not meant to be limiting. It will be appreciated by those skilled in the art that changes could be made to the details of the above-described embodiments without departing from the underlying principles thereof. The scope of the invention is, therefore, indicated by the appended claims, in which all terms are intended to be interpreted in their broadest reasonable sense unless otherwise indicated.
Claims (10)
1. A method for eliminating brightness difference of a display screen, the method comprising:
obtaining sample boxes of various models to form box samples;
respectively establishing a lamp point brightness matrix model for each type of sample box body according to the cold screen lamp point brightness graph and the hot screen lamp point brightness graph of the sample box body;
acquiring a cold screen correction coefficient according to a cold screen lamp point brightness image of the target correction box body, and performing cold screen correction on the target correction box body;
obtaining the model of the target correction box body according to the box body information of the target correction box body, and obtaining the lamp point brightness matrix model corresponding to the target correction box body according to the model;
generating a hot screen correction coefficient of the target correction box body according to the cold screen correction coefficient and the lamp point brightness matrix model corresponding to the target correction box body;
and adjusting the brightness of each lamp point in the target correction box according to the heat shield correction coefficient.
2. The method of claim 1, wherein the creating a lamp luminance matrix model for each model of the sample box according to the cold and hot lamp luminance maps of the sample box comprises:
obtaining a box body with one type from the sample box body, and executing the following steps of establishing a lamp point brightness matrix model:
lightening the box body of the model from a black screen state, and collecting a cold screen lamp lightening brightness map; preheating the temperature of the box body with the model number to a stable working temperature, and collecting a point brightness diagram of the heat shield lamp;
generating a lamp point brightness matrix of the box body with the model number according to the cold screen lamp point brightness graph and the hot screen lamp point brightness graph;
filtering the lamp point brightness matrix, and creating a lamp point brightness matrix model corresponding to the model box body;
and acquiring the box body of the next model from the sample box body, and repeatedly executing the step of establishing the lamp point brightness matrix model until the corresponding lamp point brightness matrix model is established for each model of box body in the sample box body.
3. The method of eliminating display screen brightness difference as set forth in claim 2, wherein the filtering the lamp point brightness matrix is: reassigning the luminances of the lamp points in the lamp point luminance matrix one by one, wherein,
acquiring brightness values of surrounding preset lamp points with the lamp points waiting for reassignment as the center;
calculating the average value of the brightness values of the preset lamp points;
and taking the average value as the brightness value of the lamp point waiting for reassignment.
4. The method of claim 2, wherein the generating the lamp luminance matrix for the model box according to the cold-screen lamp luminance map and the hot-screen lamp luminance map comprises:
scanning the cold screen lamp point brightness graph to obtain cold screen brightness values of lamp points at different positions in the model box body;
scanning the heat shield lamp point brightness graph to obtain the heat shield brightness values of the lamp points at different positions in the model box body;
and dividing the cold screen brightness value by the hot screen brightness value to obtain the brightness values of the lamp points at different positions, and generating a lamp point brightness matrix of the box body of the model.
5. The method of eliminating the brightness difference of the display screen according to claim 2, wherein in the sample box, the number of each type of box is plural,
the collected cold-shield lamp point brightness graph is a cold-shield lamp point brightness graph which is obtained by collecting a plurality of box bodies with the same model;
the collection of the heat shield lamp point brightness graph is a collection of a plurality of heat shield lamp point brightness graphs of the box bodies with the same model.
6. The method of claim 5, wherein the generating the lamp luminance matrix of the model box according to the cold-screen lamp luminance map and the hot-screen lamp luminance map comprises:
acquiring the cold-screen lamp point brightness images and the hot-screen lamp point brightness images of a plurality of box bodies with the same model;
scanning a plurality of cold screen lamp point brightness maps to obtain cold screen brightness values of lamp points at different positions on the cold screen lamp point brightness maps, wherein the lamp point at each position corresponds to the plurality of cold screen brightness values, and taking the median of the plurality of cold screen brightness values as the cold screen brightness value of the lamp point at each position;
scanning a plurality of heat shield lamp point brightness graphs to obtain heat shield brightness values of lamp points at different positions on the heat shield lamp point brightness graphs, wherein the lamp point at each position corresponds to the heat shield brightness values, and taking the median of the heat shield brightness values as the heat shield brightness value of the lamp point at each position;
and dividing the cold screen brightness value by the hot screen brightness value to obtain the brightness value of the lamp point at each position, and generating a lamp point brightness matrix of the model box body.
7. The method for eliminating brightness difference of display screen according to claim 1,
the establishing of the lamp point brightness matrix model for each model of box body respectively comprises the following steps of establishing the lamp point brightness matrix model for each model of box body at different temperatures respectively, and the steps comprise:
obtaining a box body with one type from the sample box body, and executing the following steps of establishing a lamp point brightness matrix model:
lightening the box body of the model from a black screen state, and collecting a cold screen lamp lightening brightness map;
preheating the temperature of the box body with the model, and collecting a point brightness graph of the heat shield lamp at different temperatures;
generating a lamp point brightness matrix of the box body of the model at different temperatures according to the cold screen lamp point brightness graph and the hot screen lamp point brightness graph at different temperatures;
filtering the lamp point brightness matrixes of the model boxes at different temperatures, and creating corresponding lamp point brightness matrix models of the model boxes at different temperatures;
and acquiring a box body of the next model from the sample box body, and repeatedly executing the step of establishing the lamp point brightness matrix model until the lamp point brightness matrix model corresponding to each model of the sample box body at different temperatures is established.
8. The method for eliminating the brightness difference of the display screen according to claim 7, wherein the obtaining the lamp point brightness matrix model corresponding to the target correction box according to the model further comprises:
and obtaining the current temperature of the target correction box body, and calculating a lamp point brightness matrix model corresponding to the target correction box body at the current temperature by adopting an interpolation method according to lamp point brightness models which are created at different temperatures and correspond to the box bodies of the models.
9. The method of claim 7, wherein the generating the lamp luminance matrix of the model box at the different temperatures according to the cold-screen lamp luminance map and the hot-screen lamp luminance map at the different temperatures comprises:
scanning the cold screen lamp point brightness graph to obtain the cold screen brightness value of each lamp point in the model box body;
scanning the heat shield lamp point brightness graphs at different temperatures to obtain the heat shield brightness values of the lamp points in the model box body at different temperatures;
and dividing the hot screen brightness value by the cold screen brightness value to obtain corresponding brightness values of the lamp points at different temperatures, and generating a lamp point brightness matrix of the model box body at different temperatures.
10. The utility model provides a eliminate device of display screen luminance difference, a serial communication port, the device includes that box cold screen correction module, lamp spot luminance matrix model establish module, box model identification module, box heat shield correction coefficient calculation module, box heat shield correction module, wherein:
the box body cold screen correction module is connected with the box body hot screen correction coefficient calculation module and is used for acquiring a cold screen correction coefficient of a target box body according to a cold screen brightness image of the target correction box body and performing cold screen correction on the target correction box body;
the lamp point brightness matrix model establishing module is connected with the box body heat screen correction coefficient calculating module and is used for establishing a corresponding lamp point brightness matrix model for each type of box body;
the box type identification module is connected with the box heat shield correction coefficient calculation module and used for identifying the type of the target box according to the box information of the target box;
the box body heat shield correction coefficient calculation module is connected with the box body cold shield correction module, the lamp spot brightness matrix model creation module, the box body model identification module and the box body heat shield correction module, and is used for acquiring a lamp spot brightness matrix model corresponding to the target box body according to the model of the target box body and calculating a heat shield correction coefficient according to the cold shield correction coefficient and the lamp spot brightness matrix model;
and the box body heat screen correction module is connected with the box body heat screen correction coefficient calculation module and is used for correcting the brightness of each lamp point in the target box body according to the heat screen correction coefficient.
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