CN118092003A - Halation evaluation method and system for Mini-LED partition backlight liquid crystal display - Google Patents
Halation evaluation method and system for Mini-LED partition backlight liquid crystal display Download PDFInfo
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Abstract
The invention discloses a halation evaluation method and a halation evaluation system for Mini-LED partition backlight liquid crystal display. Secondly, processing the brightness distribution data of the halation to analyze the satisfied function relation, so as to obtain the maximum brightness and width of the halation area of the display; further based on the hardware characteristics of the Mini-LED partition backlight LCD, it was determined that the display image brightness, the panel native contrast, and the size and number of backlight partitions are the main hardware factors affecting halo brightness and width. Finally, combining the relation among the halation influence factors, simulating and reproducing various halation actual effect pictures, and establishing halation intensity evaluation grades to grade the pictures; a model between the halo intensity and the maximum brightness and width of the halo is further built. The halation evaluation method can help to establish the evaluation standard of the display.
Description
Technical Field
The invention belongs to the technical field of information display, relates to High Dynamic Range (HDR) display and Local Dimming (Local Dimming) technology and the like, and mainly aims at the display quality of a Mini-LED partition backlight liquid crystal display device.
Background
With the maturation of Mini-LED device technology and production process, manufacturers in display industry at home and abroad put forward low-power consumption, high Dynamic Range (HDR), high resolution and wide color gamut Mini-LED backlight liquid crystal display. Meanwhile, the further upgrading of the liquid crystal display technology is promoted, so that the related display index of the OLED display is achieved or even exceeded. Therefore, such display devices are becoming increasingly popular in consumer and professional applications such as electronic athletic displays, home televisions, and monitors. With the popularization of MLED-LCDs, the display quality is more and more concerned, because the display quality is also a new display quality problem due to the use of the backlight technology of Local Dimming and the need of HDR display requirements; for example, the LED lamp beads are turned off in the Mini-LED backlight area far away from the display area, so that the basic requirements of dark state are also met in the areas on the screen, but the phenomenon of backlight leakage, namely the problem of halation, still exists around the display area, and the visual experience is poorer in the darker environment. Thus, halation is a new technical problem in such displays that needs improvement. Because of the hardware characteristics of the display, the halation phenomenon is difficult to completely eliminate, but the influence of halation can be reduced by optimizing software and hardware, and an evaluation method based on objective measurement of halation intensity is still lacking at present. Existing evaluation methods lack objective quantity measurements (such as width and brightness of halation) and are subject to glare.
Disclosure of Invention
The invention aims to:
With the continuous popularization of various Mini-LED partition backlight displays, the problem of halation (Halo) in display performance quality is more and more focused by users, but a halation evaluation method for the Mini-LED partition backlight display is still lacking at present. Therefore, the invention quantitatively realizes the representation of the halo intensity degree in a subjective and objective combination way from two dimensions of a main influence mechanism and the intensity degree grade of the halo, and establishes a comprehensive halo evaluation method system. The invention can determine the accurate measurement method of the halation physical brightness, and avoid the interference of other factors, such as the influence of glare and stray light. The method of the invention can definitely influence main objective parameters of halation, and analyze and extract influence factors from the attributes of the components such as the backlight module, the display panel and the like which are core components of the display equipment, and define the change relation between the factors and the halation intensity degree, thereby helping to guide evaluation and improve the halation problem of the Mini-LED partition backlight display.
The technical scheme is as follows:
The invention provides a halation evaluation method for Mini-LED partition backlight liquid crystal display, which comprises the following steps:
Performing halation measurement on a Mini-LED backlight display for testing in a darkroom environment to obtain halation brightness distribution in the darkroom environment;
Constructing a general expression of the two-dimensional brightness distribution of the halation according to the halation brightness distribution;
simulating a halation test picture according to the halation brightness distribution and the two-dimensional brightness distribution general expression, reproducing halation pictures under different halation influence factors according to the halation test picture, and grading the halation pictures according to halation visual acuity; the light halo influencing factors comprise the brightness of a light emitting area, the original light transmittance of a panel and the size of a Mini-LED backlight partition;
constructing a general characterization formula of the halation visual acuity of the Mini-LED backlight display in a darkroom environment according to the halation influence factors:
S＝a·f(Lhalo b·Wc)d+e (1)
Wherein a, b, c, d and e are constant coefficients, W is the width of the halo, and L halo is the maximum brightness of the halo;
Carrying S, L halo and W corresponding to the halation pictures under different halation influence factors into a formula (1), and fitting a, b, c, d and e to obtain a specific representation formula of halation visual acuity:
And (3) performing halation measurement on the Mini-LED backlight display to be tested, obtaining the maximum brightness and width of halation, and taking the maximum brightness and width into a formula (2) to obtain the value of visual acuity of halation, thereby completing halation characterization.
Preferably, the halo measurement is performed on the Mini-LED backlight display for testing in the darkroom environment, and the halo brightness distribution in the darkroom environment is obtained, which comprises the following specific steps:
displaying a test white box on a Mini-LED backlight display for testing, and moving the test white box to the position with the strongest halo;
manufacturing a mask sheet which is consistent with the size of the test white box and is light-tight and light-proof, and shielding the test white box by using the mask sheet;
And measuring the brightness values of all pixel points on a display screen when the Mini-LED backlight display displays the test white box in the darkroom environment by using an imaging brightness meter, processing the brightness values of all pixel points on the display screen, and extracting the brightness values in a single direction of the halation to obtain the single-direction brightness distribution of the halation.
Preferably, the moving the test white box to the position where halation is most intense comprises the following specific steps: the method comprises the steps of setting a test white box in the center of a screen of a Mini-LED backlight display for testing, sequentially moving the test white box in the horizontal right direction of the screen by a distance which is one tenth of the side length of a backlight partition, observing whether the width of a halation on the right side of the test white box is increased in a jumping manner through naked eyes, and if the width of the halation is increased in the jumping manner, determining that the position at the moment is the final position of the test white box in the horizontal direction; the test white box continues to move vertically upwards by a distance of one tenth of the side length of the backlight partition in sequence, whether the halation width at the upper side of the test white box is increased in a jumping manner is observed by naked eyes, if so, the position at the moment is the final position of the test white box in the vertical direction, and the final display positions of the test white box in the horizontal direction and the vertical direction of the screen are determined.
Preferably, the general expression of the two-dimensional brightness distribution of the halo is constructed according to the brightness distribution of the halo, and the specific steps include:
According to the halo brightness distribution in the darkroom environment, determining that the halo brightness distribution of the Mini-LED backlight display for testing meets Gaussian distribution, and constructing a general expression of the brightness distribution relation of the halo in a single direction of a display screen of the Mini-LED backlight display in the darkroom environment, wherein the general expression is as follows:
Wherein L Max represents the peak brightness of the halo in a single direction, sigma is the variance of the halo along the Gaussian distribution, the width of the halo is further represented, and k represents the displacement, namely the initial position of the Gaussian distribution curve;
further constructing a general expression of brightness distribution relation of a halo in the horizontal direction and the vertical direction of a display screen of a backlight display in a darkroom environment:
Wherein A, B, C, D is a constant coefficient, dyc is expressed as a distance between the pixel point and the center of the test white box in the vertical direction, and dxc is expressed as a distance between the pixel point and the center of the test white box in the horizontal direction.
Preferably, the halation pictures in different states are classified according to the halation visual acuity from low to high, the halation visual acuity S is divided into n stages, the halation visual acuity of each stage is gradually increased by 1-n, the visible threshold m, m E [1, n ] of the halation visual acuity S is set, and when S is smaller than m, the halation visual acuity is invisible to naked eyes.
The invention also provides a halation characterization system of the Mini-LED partition backlight display, which comprises the following components:
the halation measurement module is used for carrying out halation measurement on the Mini-LED backlight display for testing in the darkroom environment and obtaining halation brightness distribution in the darkroom environment;
the halation grading module is used for carrying out simulation reproduction on halation according to the acquired halation brightness distribution in the darkroom environment and grading according to halation visual acuity;
The characterization formula module is used for constructing a general characterization formula and a specific characterization formula of the halation visual sensitivity of the Mini-LED backlight display in a darkroom environment according to the halation visual sensitivity and the halation influence factors;
the darkroom halation characterization module is used for performing halation measurement on the Mini-LED backlight display to be tested in the darkroom environment, calculating to obtain the value of the visual acuity of the halation of the Mini-LED backlight display to be tested in the darkroom environment, and completing halation characterization.
Preferably: firstly, setting up a darkroom environment and a halation measuring device in the halation measuring module, wherein the halation measuring device comprises a Mini-LED backlight display for testing, a host for conveying a test picture to the Mini-LED backlight display for testing, an imaging brightness meter for measuring the brightness of the backlight display and a computer for outputting halation brightness distribution, and the brightness of the surface of an object in the darkroom environment is less than 0.001cd/m 2;
Manufacturing a mask sheet which is consistent with the size of the test white box and is light-tight and light-tight, shielding the test white box by using the mask sheet, measuring the brightness values of all pixel points on a display screen when the Mini-LED backlight display displays the test white box in a darkroom environment by using an imaging brightness meter, processing the brightness values of all pixel points on the display screen, extracting the brightness values in a single direction of a halation, and obtaining the single-direction brightness distribution of the halation.
Preferably: and the halo classifying module determines that the halo brightness distribution of the Mini-LED backlight display for testing meets Gaussian distribution according to the acquired halo brightness distribution in the darkroom environment, and constructs a general expression of brightness distribution relation of the halo in a single direction of a display screen of the Mini-LED backlight display in the darkroom environment as shown in a formula (3).
Further construct the general expression of the brightness distribution relation of the horizontal direction and the vertical direction of the display screen of the backlight display in the dark room environment, as shown in the formula (4).
According to the halo brightness distribution in the darkroom environment and the formula (4), which are obtained in the halo measurement module, simulating a halo test picture, conveying the halo test picture to an OLED display, and reproducing the pictures of the halo phenomenon in different states by using the OLED display;
the halation pictures in different states are classified according to the halation visual acuity from low to high, the halation visual acuity S is divided into n stages, S is 1-n, the halation visual acuity of each stage is gradually increased, a visible threshold value m of the halation visual acuity S is set, m is E [1, n ], and when S is smaller than m, the halation visual acuity is invisible to naked eyes.
Preferably: and a general characterization formula of the halation visual acuity S of the Mini-LED backlight display in a darkroom environment is constructed according to the halation influence factors in the construction characterization formula module, and the general characterization formula is shown as formula (1).
And carrying S, L halo and W corresponding to the halation pictures under different halation influence factors into a formula (1), and fitting a, b, c, d and e to obtain a specific representation formula of halation visual acuity, such as a formula (2).
Preferably: the camera halation characterization module is used for carrying out halation measurement on the Mini-LED backlight display in a camera environment by utilizing a halation measurement device to obtain halation brightness distribution in the camera environment;
Manufacturing a mask sheet which is consistent with the size of the test white box and is light-tight and light-tight, shielding the test white box by using the mask sheet, measuring the brightness values of all pixel points on a display screen when a Mini-LED backlight display displays the test white box in a darkroom environment by using an imaging brightness meter, processing the brightness values of all pixel points on the display screen, extracting the brightness values in a single direction of a halation, and obtaining the single-direction brightness distribution of the halation;
the maximum brightness L halo and the width W of the halation are obtained from the brightness distribution in a single direction of the halation;
Substituting the obtained values of L halo and W into a formula (2) to obtain the value of the visual halo sensitivity S of the Mini-LED backlight display in the darkroom environment, and comparing the value of the visual halo sensitivity S with a visual threshold m to finish halo characterization.
The beneficial effects are that: the invention has the following advantages by adopting the characterization method:
the halation evaluation method of the Mini-LED partition backlight display provided by the invention is a comprehensive and scientific halation evaluation method based on the measured halation brightness and halation width objective quantity, can provide specific indexes for improving halation for display equipment manufacturers, and helps developers to optimize the halation problem of different Mini-LED partition backlight display definitely. Therefore, the invention is beneficial to the improvement of the optical performance of the Mini-LED area backlight display, so that a user can experience a better Mini-LED area backlight display, and can help the improvement of the industry evaluation standard of the display.
The method can realize the evaluation of the halation intensity of the Mini-LED partition backlight display, analyzes and extracts main hardware factors such as image brightness, panel light transmittance, backlight partition size and the like based on the actually measured halation brightness and halation width, and provides great help for the design optimization of the display, the method can be more in line with the relation between the subjective evaluation of human eyes and the Mini-LED backlight display, and can help a Mini-LED partition backlight display developer to determine the lifting direction and method according to the characterization formula of the halation intensity, such as: the algorithm of the Local Dimming technology (Local Dimming), the pixel compensation of the display panel, the size, the number, the physical structure and the like of the Mini-LED partitions of the hardware facet, so that the display performance of the liquid crystal serving as the display panel can be further improved, and a user can obtain more perfect high-brightness, high-contrast, wide-color gamut, high-resolution and the like, thereby bringing better visual experience.
Drawings
FIG. 1 is a schematic diagram of the method of the present invention for locating and determining the position of a test white box.
FIG. 2 is a schematic diagram of the method of the present invention for measuring halation of a Mini-LED segmented backlight display.
Fig. 3 is a schematic illustration of brightness and width determination of a halo in the method of the present invention.
FIG. 4 is a schematic representation of the influence factor of the halo intensity of the method of the invention.
FIG. 5 is a schematic diagram of the method of the present invention simulating various halation phenomena.
FIG. 6 is a graph comparing the predicted halo intensity and the ranking values of the method of the present invention.
Fig. 7 is a general flow chart of the method of the present invention for halo evaluation.
Detailed Description
The invention is further elucidated below in conjunction with the drawings.
Example 1
The schematic diagram of searching and determining the position of a test white box by the halation evaluation method of the Mini-LED partition backlight liquid crystal display is shown in figure 1: firstly, making a white box test picture with the side length of 5% or 10% or other size types of the screen side length of a Mini-LED area backlight display, wherein the gray level of a white box is full gray level, and the gray level around the white box is 0. The initial position of the white box is fixed at the center of the screen, then the white box is sequentially moved by a distance of one tenth of the side length of the backlight partition in the horizontal right direction of the screen, whether the jumping increase occurs in the width of the halation on the right side of the white box is observed by naked eyes, and if the jumping increase occurs, the position at the moment is the final position of the white box in the horizontal direction; secondly, the white box continuously moves a distance of one tenth of the side length of the backlight partition in sequence in the vertical direction, whether the jumping increase occurs in the halation width at the upper side of the white box is observed by naked eyes, if the jumping increase occurs, the position at the moment is the final position of the white box in the vertical direction, and the final display positions of the white box in the horizontal direction and the vertical direction of the screen are determined. And finally, manufacturing a mask sheet which is consistent with the size of the display area of the test picture, light-tight and light-tight, and the mask sheet is used for shielding the display white box area of the backlight display.
Further, as shown in FIG. 2, the method of the invention measures the schematic diagram of the halation of the Mini-LED partition backlight display, and adjusts the imaging brightness meter (the imaging brightness meter has the specific requirements that the direct stable minimum measurement range is less than or equal to 0.001cd/m 2, because the brightness value of halation is smaller, the minimum measurable value is about 0.001cd/m 2, the maximum measurement range is more than or equal to 5000cd/m 2, because the maximum brightness of the Mini-LED partition backlight liquid crystal display device is within the range, the maximum peak brightness of the investigated liquid crystal panel type display is generally not more than 3000cd/m 2) and the spatial position of the Mini-LED backlight display, and the brightness meter lens is aligned with the center of the test white box; and measuring brightness values of all pixel points on a display screen when the Mini-LED backlight display displays pictures in a darkroom environment by using an imaging brightness meter.
Further, as shown in fig. 3, the brightness and width of the halo of the method of the present invention are schematically determined. First, two-dimensional luminance distribution data aligned to a center screen of a white box is measured by an imaging luminance meter, derived, and one-dimensional luminance distribution data, which is one row or one column passing through the center of the white box, is extracted. And secondly, finding the maximum brightness value L halo of the halation (close to the edge of the white box) and the halation edge brightness value of 0.001cd/m 2 from the extracted one-dimensional brightness distribution data, determining the number of pixels between the two pixel points, comparing the width of the halation in the transverse direction and the longitudinal direction, and selecting the longer side as the width of the halation. The lateral halo width is longer in this embodiment. The halation brightness distribution in the one-dimensional direction satisfies the gaussian distribution, and the distribution formula is shown in formula (1).
Where L Halo (x) is the luminance distribution of the measured halation luminance value along the horizontal direction x (Pixels). The invention establishes a general formula of brightness distribution of halation in a one-dimensional direction of a Mini-LED backlight liquid crystal display, namely, the general formula is shown as a formula (2):
Where L Max represents the maximum luminance value of the halo, σ is the variance of the halo along the Gaussian distribution, which further characterizes the width of the halo, and k is the displacement, i.e., the starting position of the Gaussian distribution curve.
Further, the invention summarizes main factors influencing the maximum brightness and width of halation according to the hardware characteristics of the Mini-LED backlight partition LCD, as shown in FIG. 4, the method of the invention has a schematic diagram of the influence factors of halation intensity, namely three main influence factors including brightness of a light-emitting area, original transmittance of a panel and the size of the Mini-LED backlight partition, and other factors include ambient light, wherein the halation is more obvious in a darker environment, so the method of the invention evaluates the halation intensity in a darkroom environment. The invention establishes a general formula of two-dimensional brightness distribution of halation on a display screen as shown in formula 3:
Wherein A, B, C, D is a constant coefficient, dyc is expressed as a distance of the pixel point from the center of the white box in the vertical direction, and dxc is expressed as a distance of the pixel point from the center of the white box in the horizontal direction.
Further, the present invention simulates different halation phenomena by changing the brightness of the light emitting area white box, changing the native contrast of the display panel, i.e. the transmittance, and the size of the backlight partitions in fig. 5. According to the invention, a plurality of effect graphs of different halation phenomena are simulated and designed, halation images in different states are classified according to the visual acuity of halation from low to high, the halation intensity degree of each stage is gradually increased, and an evaluation model of the halation intensity degree can be quantified after the classification is determined, for example, the evaluation model of the halation intensity degree shown in the formula (4) can be established by taking the evaluation model of the halation intensity degree as 1-5 stages (the stage 1 is the weakest, namely the unaware, the stage 2 halation is very weak, the stage 3 halation is not strong, the stage 4 halation is relatively strong and the stage 5 halation is very strong).
The invention further compares the model prediction grading value and the evaluation value of the halation evaluation formula, as shown in fig. 6, the model prediction grading value and the evaluation value have high correlation, and the fitting goodness R 2 =0.9069, so that the evaluation model formula can well evaluate the halation intensity.
The invention further establishes a general formula, namely, the halation pictures in different states are divided into other stages according to the halation visual sensitivity from low to high, the halation visual sensitivity of each stage is gradually increased, after the classification is determined, an evaluation model can be made by measuring and extracting two objective quantities of the maximum brightness and the width of the halation as variables, and the evaluation model is specifically shown as a formula (5):
S＝a·f(Lhalo b·Wc)d+e (5)
wherein a, b, c, d and e are constant coefficients.
FIG. 7 is a general flow chart of the method of the present invention for halo evaluation, the main flow comprising: placing a display to be tested, manufacturing a test white box, displaying, moving the white box to find the most intense position of halation, manufacturing a mask, shielding the white box, measuring the brightness and distribution of the halation of a screen by using a brightness meter, thereby obtaining the maximum brightness and width of the halation, and finally calculating the intensity degree of the halation, thereby realizing the evaluation of the intensity degree of the halation. The invention defines the 1.5 grade between the imperceptible level 1 halation and the very weak level 2 halation as the threshold value of halation visibility, and the clear value can be used for optimizing the main influencing factors of the halation intensity degree of the Mini-LED backlight display, and can also help to formulate the performance quality standard of the related products of the type.
Example 2
The invention discloses a halation characterization system of a Mini-LED partition backlight display, which comprises the following components:
the halation measurement module is used for carrying out halation measurement on the Mini-LED backlight display for testing in the darkroom environment and obtaining halation brightness distribution in the darkroom environment;
the halo measuring module is internally provided with a darkroom environment and a halo measuring device, the halo measuring device comprises a Mini-LED backlight display, a host for conveying test pictures to the Mini-LED backlight display, an imaging brightness meter for measuring brightness of the backlight display and a computer for outputting halo brightness distribution, the brightness of the surface of an object in the darkroom environment is less than 0.001cd/m 2, and other luminous bodies except the Mini-LED backlight display are shielded by opaque and non-reflective black cloth; the brightness and the area of the halo can be highlighted by the test picture to be close to the maximum effect, the host can support to output the HDR film source with high dynamic range, the minimum value of the measurement range of the imaging brightness meter needs to reach 0.001cd/m 2, and the imaging resolution is above the resolution of the Mini-LED backlight display, namely the brightness measurement at the pixel level of the display panel can be realized.
Manufacturing a mask sheet which is consistent with the size of a display area of a test picture and is light-tight and light-tight, using the mask sheet to cover a light-emitting area when the backlight display displays the test picture, measuring brightness values of all pixel points on a display screen when the Mini-LED backlight display displays the picture in a darkroom environment by an imaging brightness meter, repeating the measurement at least five times, removing maximum and minimum data, and taking an average value of the rest data; and processing the brightness values of all the pixel points on the display screen, and extracting the brightness values in a single direction of the halation to obtain the single-direction brightness distribution of the halation.
The above processing method for the brightness values of all the pixels on the display screen specifically includes eliminating the brightness value zero from all the pixels on the display screen, and extracting the brightness values of all the pixels on the horizontal display screen and the brightness values of all the pixels on the vertical display screen.
The halation grading module is used for carrying out simulation reproduction on halation according to the acquired halation brightness distribution in the darkroom environment and grading according to halation visual acuity;
And determining that the halo brightness distribution of the Mini-LED backlight display for testing meets Gaussian distribution according to the acquired halo brightness distribution in the darkroom environment in the halo grading module, and constructing a general expression of brightness distribution relation of the halo in a single direction of a display screen of the Mini-LED backlight display in the darkroom environment, wherein the general expression is shown as a formula (3).
Further construct the general expression of the brightness distribution relation of the horizontal direction and the vertical direction of the display screen of the backlight display in the dark room environment, as shown in the formula (4).
According to the halo brightness distribution in the darkroom environment and the formula (4), which are obtained in the halo measurement module, simulating a halo test picture, conveying the halo test picture to an OLED display, and reproducing the pictures of the halo phenomenon in different states by using the OLED display;
the halation pictures in different states are classified according to the halation visual acuity from low to high, the halation visual acuity S is divided into n stages, S is 1-n, the halation visual acuity of each stage is gradually increased, a visible threshold value m of the halation visual acuity S is set, m is E [1, n ], and when S is smaller than m, the halation visual acuity is invisible to naked eyes.
The characterization formula module is used for constructing a general characterization formula and a specific characterization formula of the halation visual sensitivity of the Mini-LED backlight display in a darkroom environment according to the halation visual sensitivity and the halation influence factors;
and a general characterization formula of the halation visual acuity S of the Mini-LED backlight display in a darkroom environment is constructed according to the halation influence factors in the construction characterization formula module, and the general characterization formula is shown as formula (1).
And carrying S, L halo and W corresponding to the halation pictures under different halation influence factors into a formula (1), and fitting a, b, c, d and e to obtain a specific representation formula of halation visual acuity, such as a formula (2).
The darkroom halation characterization module is used for performing halation measurement on the Mini-LED backlight display to be tested in the darkroom environment, calculating to obtain the value of the visual acuity of the halation of the Mini-LED backlight display to be tested in the darkroom environment, and completing halation characterization.
The camera halation characterization module is used for carrying out halation measurement on the Mini-LED backlight display in a camera environment by utilizing a halation measurement device to obtain halation brightness distribution in the camera environment;
Manufacturing a mask sheet which is consistent with the size of the test white box and is light-tight and light-tight, shielding the test white box by using the mask sheet, measuring the brightness values of all pixel points on a display screen when a Mini-LED backlight display displays the test white box in a darkroom environment by using an imaging brightness meter, processing the brightness values of all pixel points on the display screen, extracting the brightness values in a single direction of a halation, and obtaining the single-direction brightness distribution of the halation;
the maximum brightness L halo and the width W of the halation are obtained from the brightness distribution in a single direction of the halation;
Substituting the obtained values of L halo and W into a formula (2) to obtain the value of the visual halo sensitivity S of the Mini-LED backlight display in the darkroom environment, and comparing the value of the visual halo sensitivity S with a visual threshold m to finish halo characterization.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (10)
1. A halation evaluation method for a Mini-LED partition backlight liquid crystal display is characterized by comprising the following steps:
Performing halation measurement on a Mini-LED backlight display for testing in a darkroom environment to obtain halation brightness distribution in the darkroom environment;
Constructing a general expression of the two-dimensional brightness distribution of the halation according to the halation brightness distribution;
simulating a halation test picture according to the halation brightness distribution and the two-dimensional brightness distribution general expression, reproducing halation pictures under different halation influence factors according to the halation test picture, and grading the halation pictures according to halation visual acuity; the light halo influencing factors comprise the brightness of a light emitting area, the original light transmittance of a panel and the size of a Mini-LED backlight partition;
constructing a general characterization formula of the halation visual acuity of the Mini-LED backlight display in a darkroom environment according to the halation influence factors:
S＝a·f(Lhalo b·Wc)d+e (1)
Where a, b, c, d and e are constant coefficients, W is the width of the halo, L halo is the maximum brightness of the halo, and f () is a function of L halo and W;
Carrying S, L halo and W corresponding to the halation pictures under different halation influence factors into a formula (1), and fitting a, b, c, d and e to obtain a specific representation formula of halation visual acuity:
And (3) performing halation measurement on the Mini-LED backlight display to be tested, obtaining the maximum brightness and width of halation, and taking the maximum brightness and width into a formula (2) to obtain the value of visual acuity of halation, thereby completing halation characterization.
2. The method for evaluating halation of a Mini-LED partition backlight liquid crystal display according to claim 1, wherein the halation measurement is performed on a Mini-LED backlight display for testing in a darkroom environment, and the specific steps of obtaining halation brightness distribution in the darkroom environment include:
displaying a test white box on a Mini-LED backlight display for testing, and moving the test white box to the position with the strongest halo;
manufacturing a mask sheet which is consistent with the size of the test white box and is light-tight and light-proof, and shielding the test white box by using the mask sheet;
And measuring the brightness values of all pixel points on a display screen when the Mini-LED backlight display displays the test white box in the darkroom environment by using an imaging brightness meter, processing the brightness values of all pixel points on the display screen, and extracting the brightness values in a single direction of the halation to obtain the single-direction brightness distribution of the halation.
3. The halation evaluation method of the Mini-LED partition backlight liquid crystal display according to claim 2, wherein the moving the test white box to the most intense halation position comprises the following specific steps: the method comprises the steps of setting a test white box in the center of a screen of a Mini-LED backlight display for testing, sequentially moving the test white box in the horizontal right direction of the screen by a distance which is one tenth of the side length of a backlight partition, observing whether the width of a halation on the right side of the test white box is increased in a jumping manner through naked eyes, and if the width of the halation is increased in the jumping manner, determining that the position at the moment is the final position of the test white box in the horizontal direction; the test white box continues to move vertically upwards by a distance of one tenth of the side length of the backlight partition in sequence, whether the halation width at the upper side of the test white box is increased in a jumping manner is observed by naked eyes, if so, the position at the moment is the final position of the test white box in the vertical direction, and the final display positions of the test white box in the horizontal direction and the vertical direction of the screen are determined.
4. The halation evaluation method of the Mini-LED partition backlight liquid crystal display according to claim 2, wherein the two-dimensional brightness distribution general expression of halation is constructed according to halation brightness distribution, and the specific steps comprise:
According to the halo brightness distribution in the darkroom environment, determining that the halo brightness distribution of the Mini-LED backlight display for testing meets Gaussian distribution, and constructing a general expression of the brightness distribution relation of the halo in a single direction of a display screen of the Mini-LED backlight display in the darkroom environment, wherein the general expression is as follows:
Wherein L Max represents the peak brightness of the halo in a single direction, sigma is the variance of the halo along the Gaussian distribution, the width of the halo is further represented, and k represents the displacement, namely the initial position of the Gaussian distribution curve;
further constructing a general expression of brightness distribution relation of a halo in the horizontal direction and the vertical direction of a display screen of a backlight display in a darkroom environment:
Wherein A, B, C, D is a constant coefficient, dyc is expressed as a distance between the pixel point and the center of the test white box in the vertical direction, and dxc is expressed as a distance between the pixel point and the center of the test white box in the horizontal direction.
5. The halation evaluation method of the Mini-LED partition backlight liquid crystal display according to claim 1, wherein halation images in different states are classified according to halation visual acuity from low to high, halation visual acuity S is divided into n levels, S is 1-n, halation visual acuity of each level is gradually increased, a visible threshold m of the halation visual acuity S is set, m is [1, n ], and halation naked eyes are visually invisible when S is smaller than m.
6. A halo characterization system for a Mini-LED segmented backlight display, comprising:
the halation measurement module is used for carrying out halation measurement on the Mini-LED backlight display for testing in the darkroom environment and obtaining halation brightness distribution in the darkroom environment;
the halation grading module is used for carrying out simulation reproduction on halation according to the acquired halation brightness distribution in the darkroom environment and grading according to halation visual acuity;
The characterization formula module is used for constructing a general characterization formula and a specific characterization formula of the halation visual sensitivity of the Mini-LED backlight display in a darkroom environment according to the halation visual sensitivity and the halation influence factors;
the darkroom halation characterization module is used for performing halation measurement on the Mini-LED backlight display to be tested in the darkroom environment, calculating to obtain the value of the visual acuity of the halation of the Mini-LED backlight display to be tested in the darkroom environment, and completing halation characterization.
7. The halo characterization system of the Mini-LED segmented backlight display of claim 6, wherein: firstly, setting up a darkroom environment and a halation measuring device in the halation measuring module, wherein the halation measuring device comprises a Mini-LED backlight display for testing, a host for conveying a test picture to the Mini-LED backlight display for testing, an imaging brightness meter for measuring the brightness of the backlight display and a computer for outputting halation brightness distribution, and the brightness of the surface of an object in the darkroom environment is less than 0.001cd/m 2;
Manufacturing a mask sheet which is consistent with the size of the test white box and is light-tight and light-tight, shielding the test white box by using the mask sheet, measuring the brightness values of all pixel points on a display screen when the Mini-LED backlight display displays the test white box in a darkroom environment by using an imaging brightness meter, processing the brightness values of all pixel points on the display screen, extracting the brightness values in a single direction of a halation, and obtaining the single-direction brightness distribution of the halation.
8. The halo characterization system of the Mini-LED segmented backlight display of claim 6, wherein: the halo classifying module determines that the halo brightness distribution of the Mini-LED backlight display for testing meets Gaussian distribution according to the acquired halo brightness distribution in the darkroom environment, and constructs a general expression of brightness distribution relation of the halo in a single direction of a display screen of the Mini-LED backlight display in the darkroom environment as follows:
Wherein L Max represents the peak brightness of the halo in a single direction, sigma is the variance of the halo along the Gaussian distribution, the width of the halo is further represented, and k represents the displacement, namely the initial position of the Gaussian distribution curve;
further constructing a general expression of brightness distribution relation of a halo in the horizontal direction and the vertical direction of a display screen of a backlight display in a darkroom environment:
wherein A, B, C, D is a constant coefficient, dyc physical meaning is expressed as a distance between the pixel point and the center of the test white box in the vertical direction, and dxc physical meaning is expressed as a distance between the pixel point and the center of the test white box in the horizontal direction;
according to the halo brightness distribution in the darkroom environment and the formula (4), which are obtained in the halo measurement module, simulating a halo test picture, conveying the halo test picture to an OLED display, and reproducing the pictures of the halo phenomenon in different states by using the OLED display;
the halation pictures in different states are classified according to the halation visual acuity from low to high, the halation visual acuity S is divided into n stages, S is 1-n, the halation visual acuity of each stage is gradually increased, a visible threshold value m of the halation visual acuity S is set, m is E [1, n ], and when S is smaller than m, the halation visual acuity is invisible to naked eyes.
9. The halo characterization system of the Mini-LED segmented backlight display of claim 8, wherein: the general characterization formula of the halation visual acuity S of the Mini-LED backlight display in the darkroom environment is constructed according to the halation influence factors in the construction characterization formula module:
S＝a·f(Lhalo b·Wc)d+e (1)
Wherein a, b, c, d and e are constant coefficients, W is the width of the halo, and L halo is the maximum brightness of the halo;
Carrying S, L halo and W corresponding to the halation pictures under different halation influence factors into a formula (1), and fitting a, b, c, d and e to obtain a specific representation formula of halation visual acuity:
10. the halo characterization system of the Mini-LED segmented backlight display of claim 9, wherein: the camera halation characterization module is used for carrying out halation measurement on the Mini-LED backlight display in a camera environment by utilizing a halation measurement device to obtain halation brightness distribution in the camera environment;
Manufacturing a mask sheet which is consistent with the size of the test white box and is light-tight and light-tight, shielding the test white box by using the mask sheet, measuring the brightness values of all pixel points on a display screen when a Mini-LED backlight display displays the test white box in a darkroom environment by using an imaging brightness meter, processing the brightness values of all pixel points on the display screen, extracting the brightness values in a single direction of a halation, and obtaining the single-direction brightness distribution of the halation;
the maximum brightness L halo and the width W of the halation are obtained from the brightness distribution in a single direction of the halation;
Substituting the obtained values of L halo and W into a formula (2) to obtain the value of the visual halo sensitivity S of the Mini-LED backlight display in the darkroom environment, and comparing the value of the visual halo sensitivity S with a visual threshold m to finish halo characterization.
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