CN114659754B - Display screen consistency detection method - Google Patents
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Abstract
本发明提供了一种显示屏一致性检测方法。显示屏一致性检测方法包括：搭建用于照射所述显示屏的环境光的光学模块；获取每个所述子显示屏的图像信息；根据所述子显示屏的图像信息，获得每个所述子显示屏的测试灰度；计算每个所述子显示屏的所在位置处的环境光的校正系数；根据所述子显示屏的测试灰度及所述校正系数加权，得到每个所述子显示屏的实际灰度；将各个所述子显示屏的实际灰度进行拟合，评判所述显示屏是否满足一致性要求。因此，本申请提供了一种显示屏一致性检测方法能够比较可靠的，对显示屏黑屏一致性进行客观、准确检测。
The present invention provides a display screen consistency detection method. The display screen consistency detection method includes: building an optical module for irradiating the display screen with ambient light; obtaining image information of each of the sub-display screens; obtaining the test grayscale of each of the sub-display screens according to the image information of the sub-display screens; calculating the correction coefficient of the ambient light at the location of each of the sub-display screens; weighting the test grayscale of the sub-display screens and the correction coefficients to obtain the actual grayscale of each of the sub-display screens; fitting the actual grayscale of each of the sub-display screens to judge whether the display screen meets the consistency requirements. Therefore, the present application provides a display screen consistency detection method that can be relatively reliable and objectively and accurately detect the black screen consistency of the display screen.
Description
Technical Field
The invention relates to the field of display screens, in particular to a display screen consistency detection method.
Background
The LED display screen has the characteristics of high brightness, bright color, high luminous efficiency, high contrast, short response time, wide working temperature range, low energy consumption and the like, and is widely applied to stage display equipment, advertisement display equipment, data visualization display equipment and commercial display equipment.
In terms of structure, the LED display screen is spliced into an independent box body by a plurality of display panels, and then is spliced into a final complete screen body by a plurality of independent box bodies. Therefore, the display screen formed by splicing has the great advantages of being capable of being flexibly applied to various use scenes and free of display of the splice. However, while providing this advantage, the assembled structure also introduces other negative problems, such as screen uniformity due to differences between display panels caused by the manufacturing process.
Aiming at the problem of the consistency of the black screen of the LED display screen body, the operation is mainly carried out by subjective judgment of human eyes at present, and the human eyes have variability, so that the consistency detection result of the LED display screen is not reliable enough.
Disclosure of Invention
The invention aims to provide a display screen consistency detection method which is reliable and can accurately detect the consistency of the black screen of a display screen.
A display screen consistency detection method, the display screen comprising a plurality of sub-display screens, comprising:
constructing an optical module for illuminating the ambient light of the display screen;
acquiring image information of each sub display screen;
obtaining the test gray scale of each sub display screen according to the image information of the sub display screen;
Calculating a correction coefficient of ambient light at the position of each sub display screen, wherein the correction coefficient is specifically as follows: imaging to obtain the test gray level of the standard plate through the standard plate with the same gray level value at the position of each sub display screen; selecting the test gray level of the standard plate positioned at the central position of the display screen as the standard gray level; the ratio of the test gray level of the standard plate at each position to the standard gray level is the correction coefficient at that position;
according to the test gray scale of the sub display screen and the correction coefficient weighting, obtaining the actual gray scale of each sub display screen;
Fitting the actual gray scale of each sub display screen, and judging whether the display screens meet the consistency requirement.
In one embodiment, the standard board is a lamp board as large as the sub-display screen, and the step of calculating the correction coefficient of the ambient light at the position of each sub-display screen specifically includes:
The lamp panels are sequentially and correspondingly arranged at all positions of the sub-display screen, and test gray scales of the lamp panels are respectively obtained through imaging;
selecting the test gray level of the lamp panel corresponding to the sub-display screen at the central position of the display screen as standard gray level;
The ratio of the test gray level to the standard gray level of the lamp panel at each position is the correction coefficient at the position.
In one embodiment, the standard board is a standard color card as large as the display screen, and the step of calculating the correction coefficient of the ambient light at the position of each sub-display screen specifically includes:
covering the display screen with the standard color cards, and correspondingly partitioning the standard color cards according to the arrangement of the sub-display screens to form a plurality of sub-standard color cards;
Imaging to obtain the test gray level of the standard color card, and correspondingly obtaining the test gray level of each sub-standard color card;
The test gray level of the sub-standard color card positioned at the central position of the color card to be standard is standard gray level;
the ratio of the test gray level of the sub-standard color chart at each position to the standard gray level is the correction coefficient at that position.
In one embodiment, the step of fitting the actual gray scale of each sub display screen to judge whether the display screen meets the consistency requirement of the display screen specifically includes:
fitting the actual gray scale of each sub display screen to form a fitting curve;
and when the standard deviation of the characteristic parameters of the fitting curve is less than or equal to 0.5, the display screen meets the consistency requirement.
In one embodiment, the method specifically further includes:
Obtaining the test gray scale of each sub display screen according to the image information of the sub display screen, and constructing a test gray scale matrix of each position of the display screen according to the test gray scale of the sub display screen at each position and the position of the test gray scale;
Calculating the correction coefficient of the ambient light at the position of each sub-display screen, and constructing a correction coefficient matrix at the position of each sub-display screen according to the correction coefficient of the ambient light at the position of each sub-display screen;
Weighting the test gray matrix of each sub-display screen and the correction coefficient matrix at the position of each sub-display screen to obtain the actual gray matrix of each sub-display screen;
fitting is carried out according to the actual gray matrix of each sub-display screen to obtain a fitting curve, and when the standard deviation of the characteristic parameters of the fitting curve is smaller than or equal to 0.5, the display screen meets the consistency requirement.
In one embodiment, the method further comprises the steps of:
Adjusting the optical module to make the brightness and intensity of the ambient light of the optical module uniform;
adjusting an imaging module, comprising: the exposure of the imaging module is in linear relation with the gray value; and adjusting an imaging area of the imaging module to enable the display screen to be positioned in the middle of the imaging area of the imaging module and account for 50% -70% of the imaging area.
In one embodiment, the optical module includes two light sources, the brightness of the light sources is 1000 nit-20000 nit, and the reflected luminous flux of the environment where the display screen is located is less than 10 lumens;
The two light sources are symmetrically arranged about the center normal line of the display screen, the display screen receives two beams of incident light from the two light sources respectively, the incident angles of the two incident light are equal, and the distance between the two light sources is larger than the length of the display screen; the projection area of the optical module at the display screen is more than or equal to two thirds of the area of the display screen.
In one embodiment, the light source is a point light source, the optical module further includes a diffuser disposed in front of the point light source, and light emitted from the point light source is diffused by the diffuser and uniformly projected toward the display screen.
In one embodiment, the diffusing element is a reflecting plate, the reflecting surface of the reflecting plate is a scattering surface, the light beam of the point light source is scattered to the color temperature of 5500 kelvin-7000 kelvin of the reflecting plate of the display screen by the scattering surface, and the reflectivity of the reflecting plate to the light rays emitted by the point light source is more than 70%; the roughness of the reflecting plate satisfies: SCI-SCE < 0.5; wherein SCI is a system including specular reflection light, and SCE is a system not including specular reflection light.
In one embodiment, the imaging module includes an imaging device and a guide rail, where the imaging device is movably disposed on the guide rail to adjust an imaging position of the imaging device, and the imaging device includes a zoom lens, and an aperture value of the zoom lens is greater than or equal to 5.
According to the display screen consistency detection method, the actual gray scale of each sub display screen can be obtained through calculation through the acquired image information of each sub display screen and the correction coefficient of the ambient light corresponding to the position of the sub display screen. And judging the consistency of the display screens according to the fitting result by fitting the actual gray scale of each sub display screen. Therefore, the consistency detection method of the display screen can automatically acquire the actual gray scale of each sub-display screen through a machine, evaluate the consistency of the black screen of the display screen according to objective actual gray scale data, and does not need manual subjective observation as a judgment standard, so that the consistency detection method of the display screen is more reliable, and the detection result is more objective and accurate.
Drawings
Fig. 1 is a flowchart of a method for detecting consistency of a display screen according to an embodiment.
Fig. 2 is a spectrum distribution diagram of a light source of an optical module of a display screen black-screen consistency detection method according to an embodiment.
Fig. 3 is a flowchart of a method for detecting consistency of a display screen according to another embodiment.
Fig. 4 is a schematic diagram of an optical module of a method for detecting consistency of a display screen according to an embodiment.
Fig. 5 is a schematic diagram of an optical module of a method for detecting consistency of a display screen according to another embodiment.
Fig. 6 is a schematic diagram of an optical module of a method for detecting consistency of a display screen according to another embodiment.
Fig. 7 is a schematic structural view of the diffraction interference layer shown in fig. 6.
Fig. 8 is a schematic diagram of an optical module of a method for detecting consistency of a display screen according to another embodiment.
Fig. 9 is a schematic view of the structure of the reflection plate shown in fig. 8.
Fig. 10 is a relationship between the exposure amount and the gradation value of the imaging device.
FIG. 11 is a schematic diagram of a display screen black-screen consistency detection system according to an embodiment.
Fig. 12 is a specific flowchart of step S14.
The reference numerals are explained as follows: 11. a surface light source; 12. a point light source; 13. a diffuser; 131. a light diffusion layer; 132. a diffraction interference layer; 1321. a polarizer; 1322. a diffraction layer; 1323. an interference layer; 133 a reflecting plate;
20. A display screen; 30. an imaging module; 31. an imaging device; 32. a guide rail; 40. an image processing module; 50. a correction module; 60. and a fitting module.
Detailed Description
Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It will be understood that the invention is capable of various modifications in various embodiments, all without departing from the scope of the invention, and that the description and illustrations herein are intended to be by way of illustration only and not to be construed as limiting the invention.
The embodiment provides a display screen consistency detection method and a detection system. The display screen consistency detection method is used for detecting the black screen consistency of the display screen. The display screen consistency detection system is used for detecting the black screen consistency of the display screen according to the display screen consistency detection method.
The display screen includes a plurality of sub-display screens. The plurality of sub-display screens are spliced to form a display screen with larger overall area. The display screen is generally rectangular, and a plurality of sub-display screens are arranged according to rectangular distribution. For convenience of explanation of the sub-display screens at each position, a plurality of sub-display screens of the display screen are numbered according to a matrix array. The display screen may be arranged in m×n. For example, the display screen includes 15 sub-display screens arranged in the form of 3*5 arrays. Each sub display screen is marked as A11, A12, A13, A14 and A15 from left to right and from top to bottom in sequence; a21, a22, a23, a24, a25; a31, a32, a33, a34, a35. It will be appreciated that the display is not limited to 15 sub-displays, nor is it limited to the above-described distribution, and the specific composition of the display is not limited herein.
Referring to fig. 1, the method for detecting consistency of a display screen of the present embodiment includes:
Step S11, an optical module for irradiating the ambient light of the display screen is built.
And step S12, obtaining the image information of each sub display screen.
And S13, obtaining the test gray scale of each sub display screen according to the image information of the sub display screen.
And S14, calculating a correction coefficient of the ambient light at the position of each sub display screen.
And step S15, obtaining the actual gray scale of each sub display screen according to the test gray scale of the sub display screen and the weight of the correction coefficient.
And S16, fitting the actual gray scale of each sub display screen, and judging whether the display screens meet the consistency requirement.
By the consistency detection method of the display screen, the actual gray scale of each sub display screen can be calculated through the acquired image information of each sub display screen and the correction coefficient of the ambient light corresponding to the position of the sub display screen. And judging the consistency of the display screens according to the fitting result by fitting the actual gray scale of each sub display screen. Therefore, the consistency detection method of the display screen can automatically acquire the actual gray scale of each sub-display screen through a machine, evaluate the consistency of the black screen of the display screen according to objective actual gray scale data, and does not need manual subjective observation as a judgment standard, so that the consistency detection method of the display screen is more reliable, and the detection result is more objective and accurate.
In particular, in this embodiment, the method for detecting consistency of display screens further includes step S10, determining a position of the display screen.
The display screen is fixedly arranged on an implementation site through the fixing device. The implementation field environment of the embodiment is a weak reflection environment, and when the light source in the system is lightened, a strong reflection object is not required to exist except the tested display screen, wherein the ambient reflection luminous flux needs to be less than 10 lumens, and the ambient reflection light is prevented from interfering with the implementation of the system.
Step S11, an optical module for illuminating the ambient light of the display screen is built.
The display screen consistency detection of the present embodiment includes an optical module. The optical module is used for providing illumination light for the display screen. The optical module comprises two light sources. The two light sources are symmetrically arranged about the center normal of the display screen. The two light sources respectively emit two light beams, and the two light beams are symmetrically projected to the central position of the display screen from the left side and the right side of the display screen respectively. The display screen receives two incident lights from two light sources respectively, and the incident angles of the two incident lights are equal. Therefore, the light beams generated by the two light sources can be uniformly projected on the surface of the display screen, so that the influence of the ambient light on the surface of the display screen is reduced to the minimum, and the error in the test process caused by the uneven ambient light is avoided.
The distance between the two light sources is larger than the length of the display screen, so that a certain distance exists between the two side edges of the display screen and the light sources. The two light sources are respectively positioned at two sides of the display screen, so that the situation that partial light rays of the light sources vertically enter the display screen to cause vertical reflection, shadow is formed on the surface of the display screen, and the acquisition of imaging information of the display screen is influenced is avoided.
Referring to FIG. 2, a spectrum of the light source is shown, and the brightness of the light source is 1000 nits-20000 nits. And the display screen is in an environment with a reflected luminous flux of less than 10 lumens. The field environment of the detection method is a weak reflection environment. When the light source of the system is lit, there must not be a strongly reflective object other than the display screen, where the ambient reflected luminous flux needs to be less than 10 lumens, preventing the ambient reflected light from interfering with the system implementation.
In particular, in the present embodiment, the light source may be the surface light source 11 or the point light source 12.
Referring to fig. 3, the method for detecting consistency of display screen further includes step S112: the optical module is regulated to make the brightness and intensity of the ambient light of the optical module uniform.
Referring to fig. 4, when the light source is a surface light source 11, the two-sided light source 11 is symmetrically disposed about a center normal line of the display screen. The two surface light sources 11 respectively emit two light beams, and the two light beams are symmetrically projected to the central position of the display screen 20 from the left and right sides of the display screen 20. The display 20 receives two incident light beams from two light sources, respectively, and the incident angles of the two incident light beams are equal. Therefore, the light beams generated by the two light sources 11 can be uniformly projected on the surface of the display screen 20, so that the influence of the ambient light on the surface of the display screen 20 is reduced to the minimum, and the error in the testing process caused by the uneven ambient light is avoided.
The projected area of the surface light source 11 at the display screen 20 is greater than two-thirds of the area of the display screen.
And the horizontal spacing between the two surface light sources 11 and the two sides of the display screen 20 is S1 and S2, and satisfies: s1=s2 > 0. The distance between the two surface light sources 11 is greater than the length of the display screen. And, the included angles between the line between the center of the surface light source 11 and the center of the display screen and the normal line of the center are θ1, θ2, and θ1=θ2 is satisfied. And, the included angles between the line between the center of the surface light source 11 and the center of the display screen 20 and the surface of the surface light source 11 are α1, α2, and satisfy 0+.α1=α2+.90°. The light source arrangement of the optical module 10 can uniformly distribute the light on the surface of the display screen 20.
Referring to fig. 3, when the light source is the point light source 12, the projected area of the point light source 12 of the optical module 10 at the display screen 20 is smaller than two-thirds of the area of the display screen 20, so as to ensure that the light of the point light source 12 projected on the display screen 20 is uniform.
The horizontal spacing between the two point light sources 12 and the two sides of the display screen 20 is S1 and S2, and the following requirements are satisfied: s1=s2 > 0. I.e. the distance between the point light sources 12 is greater than the length of the display screen 20. And, the included angles between the line between the center of the point light source 12 and the center of the display screen 20 and the normal line of the center of the display screen 20 are θ1, θ2, and θ1=θ2 is satisfied. And, the included angles between the line between the center of the point light source 12 and the center of the display screen 20 and the surface of the point light source 12 are α1, α2, and satisfy 0+.α1=α2+.90°. The light source arrangement of the optical module 10 can uniformly distribute the light on the surface of the display screen 20.
Referring to fig. 5, when the light source is a point light source 12, the optical module 10 further includes a diffuser 13 disposed in front of the point light source 12. The light emitted from the point light source 12 is diffused by the diffusion member 13 and uniformly projected toward the display screen 20. The light emitted by the point light source 12 passes through the diffusion member 13 to increase the light emitting angle and the area to simulate the ambient light direction, and the brightness of the point light source is adjusted to simulate the ambient light brightness, so that the more uniform the light distribution is, the closer the visual effect of the display screen 20 is to the case of the ambient light irradiation.
The diffusion member 13 may be a light diffusion layer 131. The light diffusion layer 131 contains scattering particles. When the light emitted from the point light source 12 passes through the light diffusion layer, the light is scattered by the scattering particles, so that the light emitting angle and area of the light can be increased. The two light diffusion layers 131 are disposed between the point light source 12 and the display screen 20 and are in symmetrical relation with respect to the center normal line of the display screen 20. After the light beam is diffused by the light diffusion layer 131, the projection area of the light beam at the display screen 20 is more than or equal to two thirds of the area of the display screen 20. And the center normal of the light diffusion layer 131 coincides with the optical axis of the point light source 12.
Referring to fig. 6 and 7, the diffusing element 13 may be a diffraction interference layer 132. The diffraction interference layer 132 includes a polarizer 1321, a diffraction layer 1322, and an interference layer 1323, which are stacked in this order. Wherein the polarizer 1321 is located at a side of the diffraction interference layer 132 near the point light source 12. The polarizer 1321 converts the light emitted from the point light source 12 into polarized light, and then performs optical diffraction interference through the diffraction layer 1322 and the interference layer 1323 to form a large-area light cluster to irradiate the display screen 20. Two diffraction interference layers 132 are disposed between the point light source 12 and the display screen 20, and the two diffraction interference layers 132 are in symmetrical relation with respect to the center normal line of the display screen 20. After the light beam is diffused by the diffraction interference layer 132, the projection area of the light beam at the display screen 20 is more than or equal to two thirds of the area of the display screen 20. And the center normal of the diffraction interference layer 132 coincides with the optical axis of the point light source 12.
Referring to fig. 8 and 9, the diffusing member 13 may be a reflecting plate 133. The point light source 12 and the display screen 20 are disposed on the same side with respect to the imaging module 30 and behind the display screen 20, and the light of the point light source 12 irradiates the reflecting plate 133. The reflecting surface of the reflecting plate 133 is a scattering surface. The light beam from the point light source 12 is reflected by the scattering surface to the display screen 20.
The color temperature of the reflection plate 133 is 5500 kelvin to 7000 kelvin. The reflection plate 133 has a reflectivity of more than 70% for the light emitted from the point light source 12, and has the same reflectivity for the light of each wavelength band. After the light beam is reflected and diffused by the reflecting plate 133, the projection area of the light beam at the display screen 20 is greater than or equal to two thirds of the area of the display screen 20. The roughness of the reflection plate 133 satisfies: SCI-SCE < 0.5; wherein SCI is a system including specular reflection light (Specular Component Include), and SCE is a system not including specular reflection light (Specular Component Exclude).
Both reflecting plates 133 face the display screen 20 and are in symmetrical relation to the center normal line of the display screen 20. The horizontal spacing between the two reflecting plates 133 and the display screen 20 is S1 and S2, and s1=s2 > 0 is satisfied. The center of the reflecting plate 133 is connected with the center of the display screen 20, and the included angles between the center and the normal line of the display screen 20 are θ1 and θ2, and satisfy θ1=θ2. The line between the center of the reflection plate 133 and the center of the display screen 20 forms angles α1, α2 with the surface of the reflection plate 133, and satisfies α1=α2=90°. That is, the light of the point light source 12 is scattered by the reflecting plate 133 to form scattered light, and the scattered light is projected onto the display screen 20 in a direction perpendicular to the emitting direction of the reflecting plate 133.
The light receiving condition of the display screen 20 under the use condition is simulated through the optical module 10, so that the display screen 20 receives light uniformly, and the visual observation effect and the equipment imaging effect of the display screen 20 under the evaluation environment are consistent with those of the display screen 20 under the use condition.
The display screen consistency detection system of the present embodiment includes an imaging module 30. The imaging module 30 is disposed in front of the display screen 20. The imaging module 30 is used for imaging and acquiring image information.
The display screen consistency detection method of the present embodiment further includes step S114: the adjustment imaging module 30 specifically includes: the exposure of the imaging module is in linear relation with the gray value, the imaging area of the imaging module is regulated, and the display screen is positioned in the middle of the imaging area of the imaging module and occupies 50% -70% of the imaging area.
Referring to fig. 4, the imaging module 30 includes an imaging device 31 and a guide rail 32. The imaging device 31 is movably disposed on the guide rail 32 to adjust the position of the imaging device 31. The exposure of the imaging module is the exposure of the imaging device 31, and the imaging area of the imaging module is the imaging area of the imaging device 31.
The imaging device 31 may employ a CCD CCD (charge coupled device) camera, and the lens obtains the required imaging quality by adjusting the focal length, aperture value, integration time, ISO sensitivity of the CCD camera. The imaging device 31 includes a zoom lens. The aperture value of the zoom lens is greater than or equal to 5.
As shown in fig. 10, in the photoelectric conversion characteristic of the photosensitive material used in the photosensitive layer of the camera core structure, the exposure H and the gray value D have a nonlinear relationship d=f (H) (a to D segments), so as to ensure that the relative gray scale of the lamp panel when the display screen is black can be truly presented in the shooting process of the device, and the exposure H and the gray value D are controlled to have a linear relationship (B to C segments), specifically, the exposure satisfies the formula:
H＝B×(π/4)×[T/(F^2)]×τ；
Wherein H is exposure, B is brightness of a target object, T is exposure time, F is camera F-number, and τ is optical transmission coefficient of a lens.
Because all optical lenses can generate vignetting effect, whether the lens generates vignetting depends on the type of the lens and the aperture setting of imaging equipment, under a large aperture, light entering the lens can be blocked by a lens barrel to a certain extent, light transmitted at an acute angle can be reflected by the lens, the edge of an obtained image becomes dark, in order to enable the final imaging and visual observation result to be close to each other and improve imaging fidelity, the vignetting effect needs to be avoided as much as possible, and the zoom lens is selected and the low aperture value is more than or equal to 5.
Focusing the imaging device 31, the display screen 20 needs to be arranged in the middle of the imaging area of the imaging device and accounts for 50% -70% of the whole imaging area, and the final imaging effect needs to be consistent with the effect of subjective observation of the screen body by human eyes
And step S12, acquiring the image information of each sub display screen.
The imaging device 31 obtains a required imaging quality by adjusting the focal length, aperture value, integration time, ISO sensitivity of the CCD camera. The imaging module is used for imaging and acquiring the image information of each sub-display screen.
And S13, obtaining the test gray scale of each sub-display screen according to the image information of the sub-display screen.
Referring to fig. 11, the display screen consistency detection system further includes an image processing module 40. The image processing module 40 is configured to obtain a test gray scale of the sub-display screen according to the image information of the sub-display screen.
The image processing module 40 processes the images of the sub-display screens shot by the imaging module 30, quantifies the visual observation result into gray values to characterize the blackness difference between the plates, and can use tools such as matlab, labview, python or c++ as implementation media of the image processing algorithm.
Step S13, specifically, according to the image information of the sub-display screens, obtaining the test gray scale of each sub-display screen, and according to the test gray scale of the sub-display screen at each position and the position thereof, constructing a test gray scale matrix at each position of the display screen. The test gray matrix C of each sub display screen is as follows:
Wherein, cmn is the test gray of the sub display screen at the corresponding position.
Step S14, calculating a correction coefficient of the ambient light at the position of each sub display screen.
The display screen consistency detection system of the present embodiment further includes a correction module 50. The correction module 50 is used for calculating a correction coefficient of the ambient light at the position of each sub-display screen.
Specifically, the specific steps of calculating the correction coefficient are:
referring to fig. 12, in step S141, the test gray scale of the standard plate is obtained by imaging the standard plate with the same gray scale value at the position of each sub-display screen.
Specifically, in this embodiment, the following will be described. The display screen consistency detection of the embodiment also comprises one or more standard plates with the same gray value. The standard board is used for measuring correction coefficients of positions of the sub-display screens. The gray scale requirements are consistent throughout the standard plate.
Specifically, the test gray scale of the standard board at the position of each sub display screen is obtained, and a test gray scale matrix of the standard board at each position of the display screen is constructed according to each test gray scale and the position of each test gray scale. The test gray matrix B of the standard plate is:
Wherein Bmn is the test gray level of the standard board corresponding to the position of each sub display screen.
In one embodiment, the standard board may be a lamp board as large as the sub-display screen. Step S141 is specifically: and sequentially and correspondingly placing the lamp panels at each position of the sub display screen, and respectively imaging to obtain the test gray level of the lamp panels. The test gray of each lamp panel corresponds to the test gray of the standard panel at the position of each sub-display screen. Because the lamp panels are the same, errors can not be generated due to the self reasons of the lamp panels. Therefore, the lamp panel is sequentially placed in front of each sub-display screen, and the test gray scale at the corresponding position is obtained through imaging, and corresponds to Bmn in the test gray scale matrix B.
In another embodiment, the standard board may be a standard color card as large as a display screen. The standard color card is arranged in front of the display screen, and because the gray scales of the standard color card are uniform and consistent, the whole standard board is imaged, and the test gray scales of the standard color card corresponding to the positions of the sub display screens can be obtained. Step S141 may specifically include: and covering the display screen with the standard color cards, and correspondingly partitioning the standard color cards according to the arrangement of the plurality of sub-display screens to form a plurality of sub-standard color cards. And imaging the standard plate to obtain the test gray level of the standard color card, and correspondingly obtaining the test gray level of each sub-standard color card according to the dividing mode of the standard color card and the sub-standard color card. Therefore, the test gray level of each sub-standard color card and the test gray level of the corresponding standard board at the position of each sub-display screen correspond to Bmn in the test gray level matrix B.
Therefore, the specific form of the standard board is not limited herein, as long as the measurement gray scale at the position of the sub display screen can be measured more accurately.
Step S142, selecting the test gray scale of the standard plate positioned at the central position of the display screen as the standard gray scale.
The sub-display positioned at the center of the display may be positioned as a center sub-display according to the matrix arrangement of the sub-displays of the display. The central sub-display screen is positioned in the middle of the display screen, and the ambient light can be uniformly projected onto the central sub-display screen, so that the test gray scale of the central sub-display screen is least influenced by position factors, light factors and the like, and therefore, the test gray scale corresponding to the standard plate at the position of the central sub-display screen is selected as the standard gray scale.
Regarding the selection of the central sub-display screen, specifically: for the sub-display panels formed by m×n arrangement, the central sub-display panel is located in the matrix, and the reference symbol is aSub-displays at the locations. Wherein, In which [ (] is a rounding function, i.e. pair)And (5) rounding. The standard gray D is B in the measurement gray matrix BIs a value of (a).
For example, when the sub-displays of the display are in the form of 3*5 arrays. The central sub-display located on that display is the mark a23 sub-display. The standard gray D is the value of B23. For another example, when the sub-displays of the display are in the form of 4*6 arrays. The central sub-display screen positioned on the display screen is marked with an A23 sub-display screen, and the standard gray D is the value of B23.
For different embodiments of the standard board, when the standard board is a lamp board as large as the sub-display screen, the standard gray scale is the measured gray scale of the lamp board when the lamp board is positioned at the central sub-display screen. When the standard board is a standard color card as large as the display screen, the standard gray scale is the measurement gray scale of the sub-standard board positioned at the center sub-display screen.
In step S143, the ratio of the test gray level to the standard gray level of the standard plate at each position is the correction coefficient thereof.
The correction module 50 compares the sub-display screens at other positions with the standard gray scale, so as to evaluate the influence of the ambient light at the position of each sub-display screen, and correspondingly form a correction coefficient J of the ambient light at the position, namely: j=b/D.
Calculating the correction coefficient of the ambient light at the position of each sub-display screen, and constructing a correction coefficient matrix Jmn at the position of each sub-display screen according to the correction coefficient of the ambient light at the position of each sub-display screen, wherein the correction coefficient matrix Jmn =bmn/D; specifically, it is:
wherein Jmn is the correction coefficient of the corresponding position of each sub-display screen.
For different embodiments of the standard board, when the standard board is a lamp board as large as the sub display screen, the ratio of the test gray scale of the lamp board at each position to the standard gray scale is the correction coefficient at the position. When the standard board is a standard color card as large as the display screen, the ratio of the test gray level to the standard gray level of the sub-standard color card at each position is the correction coefficient at the position.
Referring to fig. 1 again, step S15 obtains the actual gray scale of each sub-display screen according to the test gray scale and the correction coefficient weighting of the sub-display screen. That is, the product of the test gray level of the sub-display screen and the correction coefficient at the position of the sub-display screen is the actual gray level of the sub-display screen.
The correction module 50 is further configured to obtain an actual gray level of each sub-display screen according to the test gray level of the sub-display screen and the correction coefficient at the position of the sub-display screen.
Specifically, weighting the test gray matrix of each sub-display screen and the correction coefficient matrix at the position of each sub-display screen to obtain the actual gray matrix S of each sub-display screen. The method comprises the following steps:
The test gray Cmn of the sub display screen is multiplied by a correction coefficient Jmn at the position of the sub display screen, so as to obtain the actual gray Smn of the sub display screen.
And S16, fitting the actual gray scale of each sub display screen, and judging whether the display screen meets the consistency requirement of the display screen.
The display screen consistency detection system of the present embodiment further includes a fitting module 60. The fitting module 60 is used for fitting the actual gray scale of each sub-display screen, and judging whether the display screen meets the consistency requirement.
The image processing module 40, the correction module 50 and the fitting module 60 may be integrated into a whole machine or a control chip, or may be 2 or 3 independent structures. The specific forms of the image processing module 40, the correction module 50, and the fitting module 60 are not limited herein.
The step S16 specifically includes: the fitting module 60 can fit the actual gray scale of each sub-display screen to form a fitting curve. Fitting is carried out according to the actual gray matrix S, and a fitting curve is obtained.
The fitting module 60 calculates a standard deviation of the characteristic parameters of the fitted curve, and when the standard deviation of the characteristic parameters of the fitted curve is less than or equal to 0.5, the display screen meets the consistency requirement.
In this embodiment, the fitting algorithm for the actual gray scale of each sub-display screen may be a fitting algorithm such as gaussian fitting or euclidean fitting.
According to the display screen consistency detection method and the detection system, the optical imaging equipment can be used for shooting the black screen image of the display screen, and the image processing analysis is carried out, so that the gray scale value of a single sub-display screen in the screen body of the display screen is finally obtained, and the display screen consistency characterization is carried out by replacing subjective judgment of human eyes. Therefore, the display screen consistency detection method and the detection system have objective and accurate detection results of the display screen consistency; and moreover, labor force can be saved, and the implementation and popularization are convenient.
While the invention has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (6)
1. A display screen consistency detection method for detecting a black screen consistency of a display screen, wherein the display screen comprises a plurality of sub display screens, and the display screen is characterized by comprising the following steps:
Setting up an optical module for irradiating the environment light of the display screen, wherein the reflected luminous flux of the environment where the display screen is positioned is less than 10 lumens, the optical module comprises two light sources, the light sources are point light sources, the optical module further comprises a diffusion piece arranged in front of the point light sources, the light rays emitted by the point light sources are diffused by the diffusion piece and uniformly projected towards the display screen, and the optical module is regulated to ensure that the brightness and the intensity of the environment light of the optical module are uniform; acquiring image information of each sub display screen through an imaging module; adjusting an imaging module, comprising: the exposure of the imaging module is in linear relation with the gray value; adjusting an imaging area of an imaging module to enable the display screen to be positioned in the middle of the imaging area of the imaging module and account for 50% -70% of the imaging area; according to the image information of the sub display screens, an image processing module obtains the test gray level of each sub display screen, obtains the test gray level of each sub display screen according to the image information of the sub display screen, and constructs a test gray level matrix of each position of the display screen according to the test gray level of each sub display screen and the position of each sub display screen;
calculating a correction coefficient of ambient light at the position of each sub display screen, wherein the correction coefficient is specifically as follows: the method comprises the steps that through a standard plate with the same gray value at the position of each sub-display screen, the standard plate is a standard color card which is the same as the display screen in size, and the test gray of the standard plate is obtained through imaging; selecting the test gray level of the standard plate positioned at the central position of the display screen as the standard gray level; the ratio of the test gray level of the standard plate at each position to the standard gray level is the correction coefficient at that position; the method specifically comprises the following steps: covering the display screen with the standard color cards, and correspondingly partitioning the standard color cards according to the arrangement of the sub-display screens to form a plurality of sub-standard color cards; imaging to obtain the test gray level of the standard color card, and correspondingly obtaining the test gray level of each sub-standard color card; the test gray level of the sub-standard color card positioned at the central position of the sub-standard color card is standard gray level; the ratio of the test gray level of the sub-standard color card at each position to the standard gray level is the correction coefficient of the ambient light at the position; according to the correction coefficients of the ambient light at the positions of the sub-display screens, constructing a correction coefficient matrix at the positions of the sub-display screens; according to the test gray scales of the sub-display screens and the correction coefficient weighting, obtaining actual gray scales of the sub-display screens, and weighting the test gray scale matrix of each sub-display screen and the correction coefficient matrix of the position of each sub-display screen to obtain the actual gray scale matrix of each sub-display screen;
Fitting the actual gray scale of each sub display screen, judging whether the display screens meet the consistency requirement, fitting according to the actual gray scale matrix of each sub display screen to obtain a fitting curve, and when the standard deviation of the characteristic parameters of the fitting curve is smaller than or equal to 0.5, enabling the display screens to meet the consistency requirement.
2. The method for detecting the consistency of display screens according to claim 1, wherein the standard board is a lamp board which is equal to the sub-display screen in size, and the step of calculating the correction coefficient of the ambient light at the position of each sub-display screen specifically comprises:
The lamp panels are sequentially and correspondingly arranged at all positions of the sub-display screen, and test gray scales of the lamp panels are respectively obtained through imaging;
selecting the test gray level of the lamp panel corresponding to the sub-display screen at the central position of the display screen as standard gray level;
The ratio of the test gray level to the standard gray level of the lamp panel at each position is the correction coefficient at the position.
3. The method for detecting the consistency of display screens according to claim 1, wherein the step of fitting actual gray scales of each sub display screen to judge whether the display screen meets the consistency requirement of the display screen specifically comprises the following steps:
fitting the actual gray scale of each sub display screen to form a fitting curve;
and when the standard deviation of the characteristic parameters of the fitting curve is less than or equal to 0.5, the display screen meets the consistency requirement.
4. The display screen consistency detection method according to claim 1, wherein the brightness of the light source is 1000 nit-20000 nit;
The two light sources are symmetrically arranged about the center normal line of the display screen, the display screen receives two beams of incident light from the two light sources respectively, the incident angles of the two incident light are equal, and the distance between the two light sources is larger than the length of the display screen; the projection area of the optical module at the display screen is more than or equal to two thirds of the area of the display screen.
5. The display screen consistency detection method according to claim 1, wherein the diffuser is a reflecting plate, a reflecting surface of the reflecting plate is a scattering surface, a light beam of the point light source is scattered to a color temperature of 5500 kelvin-7000 kelvin of the reflecting plate of the display screen by the scattering surface, and a reflectivity of the reflecting plate to light rays emitted by the point light source is more than 70%; the roughness of the reflecting plate satisfies: SCI-SCE < 0.5; wherein SCI is a system including specular reflection light, and SCE is a system not including specular reflection light.
6. The method according to claim 1, wherein the imaging module includes an imaging device and a guide rail, the imaging device is movably disposed on the guide rail to adjust an imaging position of the imaging device, the imaging device includes a zoom lens, and an aperture value of the zoom lens is equal to or greater than 5.
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