CN114241962A - COB screen ink color calibration method, device, equipment and medium - Google Patents
COB screen ink color calibration method, device, equipment and medium Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
- G09F9/3026—Video wall, i.e. stackable semiconductor matrix display modules
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The invention discloses a method, a device, equipment and a medium for checking ink colors of a COB screen, wherein the method comprises the following steps: when uniform ambient light is detected, acquiring screen-off brightness values corresponding to all display modules in the COB spliced screen through a preset color brightness acquisition instrument; calculating a brightness deviation value between every two adjacent screen-off brightness values, and selecting a plurality of display module pairs from a plurality of display modules according to the brightness deviation value; respectively calculating the ink color non-uniformity corresponding to each display module group; selecting a maximum value from the plurality of ink color non-uniformity degrees, and determining the maximum value as a screen ink color non-uniformity degree corresponding to the COB spliced screen; and judging whether the COB spliced screen is qualified or not according to the screen ink color non-uniformity and the pixel center distance corresponding to the COB spliced screen. Through the short-term test and the comparison of luminance value, improve the display module assembly replacement efficiency of COB concatenation screen, and then make the display effect more even, guarantee the bandwagon effect of concatenation wall.
Description
Technical Field
The invention relates to the technical field of spliced screens, in particular to a method, a device, equipment and a medium for checking ink colors of a COB screen.
Background
Under the background of global big data, with the high-speed development of information technology and internet of things technology, the acquisition amount of information of people is rapidly increased, eighty percent of the information is acquired through human eyes, so high-definition schemes of various screens emerge in the market, a single OLED (organic light emitting diode), an LCD (liquid crystal display) screen or a single projector can be selected from a 2K screen of a mobile phone to a 4K screen of a television, and the screens can reach 8K or higher resolution, so that the integrated display screen can meet the technical bottleneck of size.
Therefore, the spliced screen becomes a better selection scheme, and compared with an LCD (liquid crystal display) and DLP (digital light processing) spliced screen, the LED spliced screen becomes the mainstream of the spliced screen market in recent years due to the unique advantages of high brightness, large visual angle, seamless splicing and the like; meanwhile, compared with the SMD technology, the COB (chip-on-board) technology is the main choice for the control room due to its absolute advantages of high protection, soft vision, high reliability, etc. But because the COB surface has one deck epoxy or resin pad pasting, between lamp plate and the lamp plate, all can lead to the china ink color to have the difference because of the inconsistency of top layer technology between module and the module, also there is the colour difference between the PCB board in addition, along with the point interval diminishes, also can have certain colour difference between the wick, will inevitably lead to COB to piece together the wall under the condition that does not light finally, the china ink color inconsistency is more serious, the effect that people's eye watched is the modularization serious, not only influence beautifully, the uniformity of white screen when still influencing lighting, influence the customer and vwatch experience.
And present prior art adopts to carry out the inhomogeneous module of china ink color and change after the whole wall concatenation finishes usually, and lacks polishing, measurement, stepping and acceptance scheme, leads to display module's change inefficiency, and can't guarantee the bandwagon effect of concatenation wall.
Disclosure of Invention
The invention provides a method, a device, equipment and a medium for checking ink colors of a COB screen, which solve the technical problems that in the prior art, modules with uneven ink colors are replaced after the whole wall is spliced, and a polishing, measuring, grading and acceptance scheme is lacked, so that the replacement efficiency of a display module is low, and the display effect of a spliced wall cannot be guaranteed.
The invention provides a COB screen ink color checking method, which comprises the following steps:
when uniform ambient light is detected, acquiring screen-off brightness values respectively corresponding to the display modules in the COB spliced screen through a preset color brightness acquisition instrument;
calculating a brightness deviation value between every two adjacent screen-off brightness values, and selecting a plurality of display module pairs from a plurality of display modules according to the brightness deviation value;
respectively calculating the ink color non-uniformity corresponding to each display module group;
selecting a maximum value from the plurality of ink color non-uniformity degrees, and determining the maximum value as a screen ink color non-uniformity degree corresponding to the COB spliced screen;
and judging whether the COB spliced screen is qualified or not according to the screen ink color non-uniformity and the pixel center distance corresponding to the COB spliced screen.
Optionally, before the step of acquiring, by a preset color brightness acquisition instrument, a screen-off brightness value corresponding to each display module in the COB spliced screen when uniform ambient light is detected, the method further includes:
respectively acquiring the brightness values of a plurality of adjacent pixels in each lamp panel through a preset color brightness acquisition instrument, and determining the corresponding lamp panel brightness value based on the average value of the brightness values;
selecting a lamp panel brightness value corresponding to the first lamp panel as a standard brightness value, and respectively calculating brightness value difference values between the remaining lamp panel brightness values and the standard brightness value;
obtaining lamp panel gears corresponding to the lamp panels respectively based on the multiplication value of each brightness value difference value and preset lamp panel parameters;
and selecting a plurality of lamp panels according to the lamp panel gears for splicing to obtain the COB spliced screen.
Optionally, the lamp panel gears include positive lamp panel gears and negative lamp panel gears; according to the lamp plate gear selects a plurality ofly the lamp plate splices, obtains the step of COB concatenation screen, includes:
selecting a preset number of first target lamp panels from the lamp panels associated with the positive lamp panel gears to splice to obtain a single display module;
selecting a preset number of second target lamp panels from the lamp panels associated with the negative lamp panel gears to splice to obtain a single display module;
responding to input planning information of the COB spliced screen, and splicing by adopting a plurality of display modules to obtain the COB spliced screen;
each gear span between the first target lamp panel or each second target lamp panel is smaller than or equal to a first preset span threshold value, and each gear span between the display modules is smaller than or equal to a second preset span threshold value.
Optionally, the step of calculating a brightness deviation value between every two adjacent screen-off brightness values, and selecting a plurality of display module pairs from a plurality of display modules according to the brightness deviation value includes:
acquiring the total system resolution corresponding to the COB spliced screen;
judging whether the total system resolution is greater than a preset resolution threshold value or not;
if not, calculating a brightness deviation value between every two adjacent screen-off brightness values;
and selecting display module groups with the same number as the preset regions from high to low along the brightness deviation value.
Optionally, the method further comprises:
if the total system resolution is greater than a preset resolution threshold, calculating the ratio of the total system resolution to the resolution threshold by adopting a rounding function to obtain the number of region divisions;
equally dividing the COB spliced screen according to the area dividing quantity to obtain a plurality of divided areas;
respectively calculating a brightness deviation value between every two adjacent screen-off brightness values in each divided area;
and selecting display module groups with the same number as that of the preset regions from the divided regions along the brightness deviation value from high to low.
Optionally, the step of judging whether COB mosaic screen is qualified according to the screen ink color non-uniformity with the pixel centre-to-centre spacing that COB mosaic screen corresponds includes:
determining a corresponding ink color non-uniformity threshold value according to the pixel center distance corresponding to the COB spliced screen;
comparing the screen color non-uniformity to the ink color non-uniformity threshold;
if the screen ink color non-uniformity is larger than the ink color non-uniformity threshold value, judging that the COB spliced screen is unqualified;
and if the screen ink color non-uniformity is smaller than or equal to the ink color non-uniformity threshold value, judging that the COB spliced screen is qualified.
Optionally, the method further comprises:
if judge that COB concatenation screen is unqualified, then jump the execution gather the luminance value of a plurality of adjacent pixels in each lamp plate respectively through predetermined colour luminance collection appearance, based on the step of the average value of luminance value confirms corresponding lamp plate luminance value, until judging COB concatenation screen is qualified.
The second aspect of the present invention further provides a COB screen ink color calibration apparatus, including:
the brightness value acquisition module is used for acquiring screen-off brightness values corresponding to the display modules in the COB spliced screen through a preset color brightness acquisition instrument when uniform ambient light is detected;
the display module group selection module is used for calculating a brightness deviation value between every two adjacent screen-off brightness values and selecting a plurality of display module groups from a plurality of display modules according to the brightness deviation value;
the ink color non-uniformity calculating module is used for respectively calculating the ink color non-uniformity corresponding to each display module group;
the screen ink color non-uniformity selecting module is used for selecting a maximum value from the plurality of ink color non-uniformities and determining the maximum value as the screen ink color non-uniformity corresponding to the COB spliced screen;
and the qualified judgment module is used for judging whether the COB spliced screen is qualified or not according to the screen ink color non-uniformity and the pixel center distance corresponding to the COB spliced screen.
A third aspect of the present invention provides an electronic device, including a memory and a processor, where the memory stores a computer program, and the computer program, when executed by the processor, causes the processor to execute the steps of the COB screen ink color checking method according to any one of the first aspects of the present invention.
A fourth aspect of the present invention provides a computer-readable storage medium having stored thereon a computer program that, when executed, implements the COB screen ink color verification method according to any one of the first aspects of the present invention.
According to the technical scheme, the invention has the following advantages:
when uniform ambient light is detected, screen extinguishing brightness values of all display modules in the COB spliced screen in a screen extinguishing state are collected through a color brightness collector, and brightness deviation values between adjacent screen extinguishing brightness values are further calculated, so that a plurality of display module pairs with large brightness deviation values are obtained through screening from the plurality of display modules; and meanwhile, calculating the ink color non-uniformity degree corresponding to each display module group based on the brightness deviation value, selecting the maximum value of the ink color non-uniformity degree as the screen ink color non-uniformity degree corresponding to the COB spliced screen, and finally judging whether the COB spliced screen is qualified or not based on the comparison result of the ink color non-uniformity degree threshold value selected by the pixel center distance corresponding to the COB spliced screen and the screen ink color non-uniformity degree. Thereby solve prior art and adopt to carry out the inhomogeneous module of china ink color and change after the whole wall concatenation finishes usually, and lack and polish, measure, stepping and accept the scheme, lead to display module's change inefficiency, and can't guarantee the technical problem of the bandwagon effect of concatenation wall. Through the short-term test and the comparison of luminance value, improve the display module assembly replacement efficiency of COB concatenation screen, and then make the display effect more even, guarantee the bandwagon effect of concatenation wall.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart illustrating steps of a method for checking an ink color of a COB screen according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating steps of a COB screen ink color calibration method according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of a lamp panel ink color screening process provided by an embodiment of the invention;
fig. 4 is a schematic diagram illustrating a process of determining a qualified COB spliced screen in terms of non-uniformity of ink color according to an embodiment of the present invention;
fig. 5 is a block diagram of a structure of a COB screen ink color calibration apparatus according to a third embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method, a device, equipment and a medium for checking ink colors of a COB screen, which are used for solving the technical problems that in the prior art, modules with uneven ink colors are replaced after the whole wall is spliced, and a polishing, measuring, grading and acceptance scheme is lacked, so that the replacement efficiency of a display module is low, and the display effect of a spliced wall cannot be guaranteed.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for checking an ink color of a COB panel according to an embodiment of the present invention.
The invention provides a COB screen ink color checking method, which comprises the following steps:
the uniform ambient light refers to light which is output by a color temperature output of 3200-9300K, has a surface with a homogenizing treatment process such as a light-emitting lamp of a uniform light curtain or a uniform light resin layer, and has different color temperatures and is uniform in all directions. Wherein, the quantity of the lamp of polishing can be a plurality ofly, and the lamp face angle of lamp is polished in the rotating electrical machines control through setting up on portable tripod to the light that keeps the in-process output at whole COB screen china ink color check-up method is all even.
The color brightness collector is an instrument for measuring parameters such as color, color difference and ISO brightness reflected by an object.
The COB spliced screen refers to an LED display screen which is formed by directly handing over and mounting a semiconductor chip, integrating the semiconductor chip on an MCPCB (micro-chip printed Circuit Board) to form a COB light source module and realizing the electrical connection between the chip and a substrate by a lead stitching method.
In the embodiment of the invention, when the device detects that the light output by the lighting lamp is the uniform ambient light, the screen-off brightness value of each display module in the COB spliced screen in the screen-off state at the moment can be acquired by the color brightness acquisition instrument.
It should be noted that, the acquisition process of the screen-off brightness value may be respectively performed in the normal direction of the measurement point of each display module to perform measurement and acquisition.
in order to further screen and obtain the display module group with poor ink color uniformity, the brightness deviation values between every two adjacent display module groups can be respectively calculated, and a plurality of display module groups with the largest brightness deviation values are selected from the plurality of display module groups based on the sequencing of the brightness deviation values from high to low.
The number of the display module pairs may be determined by the current resolution, for example, when the total system resolution is less than or equal to 10080P, 9 display module pairs are taken, and when the system resolution is greater than 10080P, the total system resolution is divided by 2073600(10080P) to be rounded to obtain an integer n (for example, when n is 4K, n is 4, the whole screen needs to be divided into 4 regions, and then 9 display module pairs are taken from each region for testing).
after a plurality of display module pairs are selected and obtained, in order to further determine the adjustment sequence, the minimum value of the brightness deviation value can be taken, and the ratio of the brightness deviation value corresponding to each display module pair to the minimum value of the brightness deviation value is respectively calculated, so that the ink color non-uniformity corresponding to each display module pair is obtained.
1004, selecting a maximum value from the plurality of ink color non-uniformity degrees, and determining the maximum value as a screen ink color non-uniformity degree corresponding to the COB spliced screen;
and 1005, judging whether the COB spliced screen is qualified or not according to the screen ink color non-uniformity and the pixel center distance corresponding to the COB spliced screen.
In the specific implementation, the COB spliced screen has different pixel center distances along with different resolutions, and in order to improve the judgment efficiency of the COB spliced screen, the maximum value can be selected from a plurality of calculated ink color non-uniformity degrees to serve as the screen ink color non-uniformity degree corresponding to the COB spliced screen; and determining a corresponding ink color non-uniformity threshold value based on the pixel center distance corresponding to the COB spliced screen, comparing the current screen ink color non-uniformity value with the ink color non-uniformity threshold value, if the current screen ink color non-uniformity value is smaller than the ink color non-uniformity threshold value, indicating that the COB spliced screen is qualified at the moment, otherwise judging that the COB spliced screen is unqualified, and accordingly measuring and checking the COB spliced screen.
In the embodiment of the invention, when uniform ambient light is detected, screen-off brightness values of all display modules in the COB spliced screen in a screen-off state are collected through a color brightness collector, and brightness deviation values between adjacent screen-off brightness values are further calculated, so that a plurality of display module groups with larger brightness deviation values are obtained by screening from the plurality of display modules; and meanwhile, calculating the ink color non-uniformity degree corresponding to each display module group based on the brightness deviation value, selecting the maximum value of the ink color non-uniformity degree as the screen ink color non-uniformity degree corresponding to the COB spliced screen, and finally judging whether the COB spliced screen is qualified or not based on the comparison result of the ink color non-uniformity degree threshold value selected by the pixel center distance corresponding to the COB spliced screen and the screen ink color non-uniformity degree. Thereby solve prior art and adopt to carry out the inhomogeneous module of china ink color and change after the whole wall concatenation finishes usually, and lack and polish, measure, stepping and accept the scheme, lead to display module's change inefficiency, and can't guarantee the technical problem of the bandwagon effect of concatenation wall. Through the short-term test and the comparison of luminance value, improve the display module assembly replacement efficiency of COB concatenation screen, and then make the display effect more even, guarantee the bandwagon effect of concatenation wall.
Referring to fig. 2, fig. 2 is a flowchart illustrating a step of a COB screen ink color calibration method according to a second embodiment of the present invention.
The invention provides a COB screen ink color checking method, which comprises the following steps:
the lamp plate indicates to adopt the COB technique, through the COB light source module that constitutes with luminescence chip integration at the PCB board.
In the embodiment of the invention, when uniform ambient light is detected, the color brightness acquisition instrument is used for respectively acquiring the brightness values of a plurality of adjacent pixels in each lamp panel, calculating the average value of the brightness values of a plurality of adjacent pixels in the same lamp panel, and determining the average value as the lamp panel brightness value corresponding to each lamp panel.
It should be noted that, at this time, the brightness of the uniform ambient light output by the lighting lamp can be adjusted to 200 × (1 ± 2.5%) lux, and the color temperature output is 9300K.
in the embodiment of the invention, in order to facilitate the subsequent calculation of the brightness value difference value corresponding to each lamp panel, the brightness value of the lamp panel corresponding to the first lamp panel can be selected as the standard brightness value, and the brightness value difference value between the remaining brightness values of each lamp panel and the standard brightness value can be further calculated.
and calculating multiplication values between the brightness value difference values and the lamp panel parameters to determine the lamp panel gears respectively corresponding to the lamp panels.
In a specific implementation, the process of step 202-203 can be implemented by the following example:
taking N lamp panels as an example, the brightness value of the corresponding lamp panel is L0～LNLamp plate brightness value L corresponding to the first lamp plate0As standard brightness value, and keeping the 1 bit behind the decimal point; value L of subsequent measurement1Retain position 1 after decimal point, and mix 10 × (L)1-L0) As a result D1The lamp panel is used as a lamp panel gear of the lamp panel; l is2～LNAll calculate its lamp panel gear (D) according to the above process2，D3，…，DN)。
Optionally, the standard brightness value may be obtained by calculating a sum of brightness values of lamp panels corresponding to the N lamp panels, and averaging (L)0+L1+…+LN)/N。
optionally, the lamp panel gears include positive lamp panel gears and negative lamp panel gears; step 204 may include the following sub-steps:
selecting a preset number of first target lamp panels from the lamp panels associated with the positive lamp panel gears to splice to obtain a single display module;
selecting a preset number of second target lamp panels from the lamp panels associated with the negative lamp panel gears to splice to obtain a single display module;
responding to input planning information of the COB spliced screen, and splicing by adopting a plurality of display modules to obtain the COB spliced screen; the gear span between each first target lamp plate or each second target lamp plate is smaller than or equal to a first preset span threshold value, and the gear span between each display module is smaller than or equal to a second preset span threshold value.
In concrete implementation, the lamp plate gear can include positive lamp plate gear and negative lamp plate gear, and after the lamp plate gear that each lamp plate corresponds is confirmed, can will mark each lamp plate according to the lamp plate gear respectively. The first target lamp plates with the preset number are selected from the lamp plates with the positive lamp plate gears for splicing to obtain a display module, or the second target lamp plates with the preset number are selected from the lamp plates with the negative lamp plate gears for splicing to obtain a display module.
After obtaining a plurality of display module assemblies in the concatenation, can respond the COB concatenation screen planning information of input this moment, select a plurality of display module assemblies to splice in order to obtain COB concatenation screen.
It should be noted that, in the splicing process of the display module, the lamp panel with the same lamp panel gear is used. In order to avoid the process of ink color difference between the lamp panels, the gear span between each first target lamp panel or each second target lamp panel is smaller than or equal to a first preset span threshold value, and the gear span between each display module is smaller than or equal to a second preset span threshold value.
The preset number can be the number of lamp panels required by one display module, for example, 3 rows and 4 columns, namely, 12 lamp panels are included. The first preset span threshold may be 2, and the second preset span threshold may be 4, and the specific value of the span threshold is not limited in the embodiment of the present invention.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a lamp panel ink color screening process according to an embodiment of the invention.
In the embodiment of the present invention, the color brightness acquisition instrument 101 is fixed on the tripod 104, the tripod 104 is fixed on the triangular tray 105, the rotating motor 102 and the rotating motor 103 can cooperate to control the computer to operate the acquisition direction of the rotating color brightness acquisition instrument 101, the rotating motor 115 is located at the connection position of the triangular tray 105 and the transmission platform 113, and can cooperate to control the computer to operate the rotating triangular tray 105 to control the color brightness acquisition instrument 101 to align to the central position of the lamp panel 114, so as to acquire color brightness information. Two sets of left light 106 and right light 117, it is LED dot matrix to require the light source, can output 3200 ~ 9300K colour temperature, the surface is the homogenization treatment process, including even light curtain or even light resin layer, mainly in order to shine different colour temperatures and all directions all very even light, left light 106 and right light 117 are fixed on portable tripod, rotating electrical machines 107 and rotating electrical machines 118 can cooperate the rotatory lamp face angle of adjusting the light of shining of control computer operation. The transmission platform 113 includes a lamp panel 112 and a transmission rail 111, when the lamp panel 112 is transmitted from the initial position 119 to the position 114, the detection platform 110 is turned over from the horizontal direction to the vertical position 109, i.e. perpendicular to the direction of the 101-color brightness collector, the lamp panel 114 is transmitted to the position 108 after measurement to complete the whole test process and generate a grading label, i.e. a negative lamp panel gear or a positive lamp panel gear, and the whole process is realized by the control computer 116 through the execution of step 201 and step 204.
in the embodiment of the present invention, the specific implementation process of step 205 is similar to that of step 1001, and is not described herein again.
In a specific implementation, the uniform ambient light here may satisfy the following condition, and the lighting condition is the normal illuminance of the touch screen: 200Lux +/-2.5% (in order to eliminate reading errors of the instrument, the smaller the difference between the ambient light illumination of two adjacent points is, the better the difference is, the control deviation is within 2.5%), the color brightness acquisition instrument needs to be placed at a position 2 meters behind the lighting lamp, the left and right lighting lamps need to be at symmetrical positions of a measuring point and a central axis of the lamp panel, and the lighting lamp positions can be flexibly adjusted to meet the illumination requirements when different groups are measured.
optionally, step 206 may include the following sub-steps:
acquiring the total system resolution corresponding to the COB spliced screen;
judging whether the total system resolution is greater than a preset resolution threshold value or not;
if not, calculating the brightness deviation value between every two adjacent screen-off brightness values;
and selecting the display module groups with the same number as the preset areas from high to low along the brightness deviation value.
In the embodiment of the present invention, whether the total system resolution is greater than a resolution threshold may be determined by obtaining the total system resolution corresponding to the COB mosaic screen, for example, 2073600, that is, a resolution corresponding to 1080P may be set. If the total resolution of the system is smaller than or equal to the resolution threshold, a brightness deviation value between two adjacent screen-off brightness values in the current COB spliced screen can be calculated, display module groups with the same number of preset regions are selected according to the brightness deviation value from high to low, and the number of the preset regions can be set to be 9.
Further, step 206 may also include the following sub-steps:
if the total resolution of the system is greater than a preset resolution threshold, calculating the ratio of the total resolution of the system to the resolution threshold by adopting a rounding function to obtain the number of the region partitions;
equally dividing the COB spliced screen according to the number of the divided areas to obtain a plurality of divided areas;
respectively calculating a brightness deviation value between every two adjacent screen-off brightness values in each divided area;
and selecting the display module groups with the number equal to that of the preset regions from the divided regions from high to low along the brightness deviation value.
In the embodiment of the invention, if the total resolution of the system is greater than the resolution threshold, the COB splicing resolution is higher at the moment, the ratio between the total resolution of the system and the resolution threshold can be calculated by adopting a rounding function to obtain the number of area divisions, then the COB spliced screen is equally divided according to the number of the area divisions to obtain a plurality of divided areas, and the brightness deviation value between every two adjacent screen-off brightness values is calculated in each divided area; and selecting the display module groups with the number equal to that of the preset regions from the divided regions from high to low along the brightness deviation value.
For example, when the system resolution is less than or equal to 1080P, 9 pairs of adjacent regions are taken, when the system resolution is greater than 1080P, the system total resolution is divided by 2073600(1080P) to be rounded to obtain an integer n, for example, when 4K, n is 4, the whole screen is divided into 4 regions on average, and then 9 pairs of adjacent regions are taken from the respective regions for testing.
in the embodiment of the present invention, the non-uniformity of the ink color corresponding to each display module group may be respectively calculated based on the obtained brightness deviation values, which may be specifically as follows:
wherein A isiFor the ink color non-uniformity of the ith display module pair, Li1The screen-off brightness value L corresponding to the first display module in the ith display modulei2The screen-off brightness value (L) corresponding to the second display module in the ith display modulei1,Li2)minAnd the minimum screen-off brightness value corresponding to the ith display module group.
208, selecting a maximum value from the plurality of ink color non-uniformity degrees, and determining the maximum value as a screen ink color non-uniformity degree corresponding to the COB spliced screen;
in the embodiment of the present invention, the specific implementation process of step 208 is similar to step 1004, and is not described herein again.
And step 209, judging whether the COB spliced screen is qualified or not according to the screen ink color non-uniformity and the pixel center distance corresponding to the COB spliced screen.
Optionally, step 209 may comprise the following sub-steps:
determining a corresponding ink color non-uniformity threshold value according to a pixel center distance corresponding to the COB spliced screen;
comparing the screen ink color non-uniformity with an ink color non-uniformity threshold;
if the screen ink color non-uniformity is larger than the ink color non-uniformity threshold value, judging that the COB spliced screen is unqualified;
and if the screen ink color non-uniformity is smaller than or equal to the ink color non-uniformity threshold value, judging that the COB spliced screen is qualified.
In the embodiment of the invention, the corresponding ink color non-uniformity threshold value can be determined according to the pixel center distance corresponding to the COB spliced screen, and whether the COB spliced screen is qualified or not is judged by comparing the screen ink color non-uniformity with the ink color non-uniformity threshold value.
Wherein, the selection marking of the corresponding ink color non-uniformity threshold value according to the pixel center distance that COB spliced screen corresponds can be as shown in the following table 1:
| pixel center distance P | 1mm＜P≤2.5mm | 0.5mm＜P≤1mm | P≤0.5mm |
| Threshold of ink color non-uniformity | 10％ | 8％ | 5％ |
TABLE 1
Further, step 209 may also include the following sub-steps:
and if the COB spliced screen is judged to be unqualified, skipping execution is carried out, the brightness values of a plurality of adjacent pixels in each lamp panel are respectively acquired through a preset color brightness acquisition instrument, and the step of determining the brightness value of the corresponding lamp panel based on the average value of the brightness values is carried out until the COB spliced screen is judged to be qualified.
In the embodiment of the invention, if the COB spliced screen is judged to be unqualified, the step 201 can be skipped to, and each lamp panel in the COB spliced screen is adjusted again until the COB spliced screen is judged to be qualified.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating a process of determining a pass-uniformity of ink color unevenness of a COB tile panel according to an embodiment of the present invention.
In the embodiment of the present invention, the color luminance measuring instrument 303 is fixed to a tripod 304 having a height and angle adjusting function, and the lighting lamps 301 and 309 are fixed to tripods 302 and 310 having a height and angle adjusting function, respectively. Firstly, initializing a color brightness measuring instrument 303, wherein the initialization content is to zero the numerical value of the color brightness acquisition instrument 301, and the height and the angle of the color brightness acquisition instrument are vertical to the position of a lamp panel 305 or 306 to be measured through manual adjustment; then choose the survey position, for example COB piece together wall 307 resolution ratio is 4K, and this COB piece together the wall and can divide into like sub-screen 308(1080P)4, and this sub-screen comprises a plurality of display module assembly again, chooses the basis of survey position to be:
a) when the system resolution is less than or equal to 1080P, 9 pairs of display module pairs are taken, when the system resolution is greater than 1080P, the total system resolution is divided by 2073600(1080P) to be rounded to obtain an integer n (if 4K, n is 4, the whole screen is averagely divided into 4 areas, then 9 pairs of display module pairs are taken from the areas to be tested), and respective A is respectively calculated1，A2，…，AnTaking the maximum value ABAs a result.
b) The lighting lamps are uniformly irradiated on each subarea, the ink color modules with obvious differences in each area are observed (at least 2 people are needed for selecting the areas with obvious differences subjectively), and 9 pairs of adjacent lamp panels with the most obvious differences are respectively selected in each area, such as the transverse positions 305 and 306 or the vertical position in fig. 3.
Then, uniform lighting is carried out, and areas of adjacent groups of collection points 305 and 306 are respectively lighted by using lighting lamps 301 and 309, wherein the lighting conditions are required to be the normal illuminance of the screen: 200Lux +/-2.5% (to eliminate reading error, the difference between the ambient light illumination of two adjacent points is smaller and better, here, the deviation is controlled within 2.5% according to empirical value), the color brightness acquisition instrument 303 needs to be placed at a position 2 m behind the lighting lamp, and the left and right lighting lamps should be placed at the symmetrical positions of the central axes of the lamp panels 305 and 306 of the measuring pointAnd the position of the lighting lamp can be flexibly adjusted to meet the illumination requirement when different groups are measured. Following data acquisition, luminance values L of the lamp panels 305 and 306 are respectively acquired by the color luminance acquirer 30311And L12(ii) a Recalculating the ink color non-uniformity A1(ii) a Selecting other eight groups of data, and calculating A2～A8Selecting the maximum value as the final result AB。
Finally, compare A according to Table 1 aboveBA spaced from the corresponding dotBRequire, for example, P1.2 pitch for this example, then A1Should be less than or equal to 10%, otherwise, the product should be judged as unqualified.
In the embodiment of the invention, when uniform ambient light is detected, screen-off brightness values of all display modules in the COB spliced screen in a screen-off state are collected through a color brightness collector, and brightness deviation values between adjacent screen-off brightness values are further calculated, so that a plurality of display module groups with larger brightness deviation values are obtained by screening from the plurality of display modules; and meanwhile, calculating the ink color non-uniformity degree corresponding to each display module group based on the brightness deviation value, selecting the maximum value of the ink color non-uniformity degree as the screen ink color non-uniformity degree corresponding to the COB spliced screen, and finally judging whether the COB spliced screen is qualified or not based on the comparison result of the ink color non-uniformity degree threshold value selected by the pixel center distance corresponding to the COB spliced screen and the screen ink color non-uniformity degree. Thereby solve prior art and adopt to carry out the inhomogeneous module of china ink color and change after the whole wall concatenation finishes usually, and lack and polish, measure, stepping and accept the scheme, lead to display module's change inefficiency, and can't guarantee the technical problem of the bandwagon effect of concatenation wall. Through the short-term test and the comparison of luminance value, improve the display module assembly replacement efficiency of COB concatenation screen, and then make the display effect more even, guarantee the bandwagon effect of concatenation wall.
Referring to fig. 5, fig. 5 is a block diagram illustrating a structure of a COB screen ink color checking apparatus according to a third embodiment of the present invention.
The embodiment of the invention provides a COB screen ink color checking device, which comprises:
the brightness value acquisition module 501 is used for acquiring screen-off brightness values corresponding to all display modules in the COB spliced screen through a preset color brightness acquisition instrument when uniform ambient light is detected;
a display module pair selecting module 502, configured to calculate a brightness deviation value between every two adjacent screen-out brightness values, and select a plurality of display module pairs from the plurality of display modules according to the brightness deviation value;
an ink color non-uniformity calculating module 503, configured to calculate ink color non-uniformities corresponding to each display module pair respectively;
the screen ink color non-uniformity selecting module 504 is configured to select a maximum value from the plurality of ink color non-uniformities, and determine the maximum value as a screen ink color non-uniformity corresponding to the COB mosaic screen;
and the qualification judgment module 505 is used for judging whether the COB spliced screen is qualified or not according to the screen ink color non-uniformity and the pixel center distance corresponding to the COB spliced screen.
Optionally, the apparatus further comprises:
the lamp panel brightness value acquisition module is used for respectively acquiring the brightness values of a plurality of adjacent pixels in each lamp panel through a preset color brightness acquisition instrument and determining the corresponding lamp panel brightness value based on the average value of the brightness values;
the brightness value difference calculation module is used for selecting the lamp panel brightness value corresponding to the first lamp panel as a standard brightness value and respectively calculating the brightness value difference between the brightness value of each residual lamp panel and the standard brightness value;
the lamp panel gear calculation module is used for obtaining lamp panel gears corresponding to the lamp panels respectively based on the multiplication value of each brightness value difference value and preset lamp panel parameters;
and the lamp panel splicing module is used for selecting a plurality of lamp panels according to the lamp panel gears to splice to obtain a COB spliced screen.
Optionally, the lamp panel gears include positive lamp panel gears and negative lamp panel gears; the lamp panel splicing module is specifically used for:
selecting a preset number of first target lamp panels from the lamp panels associated with the positive lamp panel gears to splice to obtain a single display module;
selecting a preset number of second target lamp panels from the lamp panels associated with the negative lamp panel gears to splice to obtain a single display module;
responding to input planning information of the COB spliced screen, and splicing by adopting a plurality of display modules to obtain the COB spliced screen;
the gear span between each first target lamp plate or each second target lamp plate is smaller than or equal to a first preset span threshold value, and the gear span between each display module is smaller than or equal to a second preset span threshold value.
Optionally, the display module group selection module 502 is specifically configured to:
acquiring the total system resolution corresponding to the COB spliced screen; judging whether the total system resolution is greater than a preset resolution threshold value or not; if not, calculating the brightness deviation value between every two adjacent screen-off brightness values;
and selecting the display module groups with the same number as the preset areas from high to low along the brightness deviation value.
Optionally, the display module group selection module 502 is further specifically configured to:
if the total resolution of the system is greater than a preset resolution threshold, calculating the ratio of the total resolution of the system to the resolution threshold by adopting a rounding function to obtain the number of the region partitions;
equally dividing the COB spliced screen according to the number of the divided areas to obtain a plurality of divided areas;
respectively calculating a brightness deviation value between every two adjacent screen-off brightness values in each divided area;
and selecting the display module groups with the number equal to that of the preset regions from the divided regions from high to low along the brightness deviation value.
Optionally, the qualification module 505 is specifically configured to:
determining a corresponding ink color non-uniformity threshold value according to a pixel center distance corresponding to the COB spliced screen;
comparing the screen ink color non-uniformity with an ink color non-uniformity threshold;
if the screen ink color non-uniformity is larger than the ink color non-uniformity threshold value, judging that the COB spliced screen is unqualified;
and if the screen ink color non-uniformity is smaller than or equal to the ink color non-uniformity threshold value, judging that the COB spliced screen is qualified.
Optionally, the qualification module 505 is further configured to:
and if the COB spliced screen is judged to be unqualified, skipping execution is carried out, the brightness values of a plurality of adjacent pixels in each lamp panel are respectively acquired through a preset color brightness acquisition instrument, and the step of determining the brightness value of the corresponding lamp panel based on the average value of the brightness values is carried out until the COB spliced screen is judged to be qualified.
An embodiment of the present invention provides an electronic device, which includes a memory and a processor, where the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the COB screen ink color calibration method according to any embodiment of the present invention.
Embodiments of the present invention provide a computer-readable storage medium, on which a computer program is stored, where the computer program is executed to implement a COB screen ink color verification method according to any embodiment of the present invention.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and modules may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A COB screen ink color checking method is characterized by comprising the following steps:
when uniform ambient light is detected, acquiring screen-off brightness values respectively corresponding to the display modules in the COB spliced screen through a preset color brightness acquisition instrument;
calculating a brightness deviation value between every two adjacent screen-off brightness values, and selecting a plurality of display module pairs from a plurality of display modules according to the brightness deviation value;
respectively calculating the ink color non-uniformity corresponding to each display module group;
selecting a maximum value from the plurality of ink color non-uniformity degrees, and determining the maximum value as a screen ink color non-uniformity degree corresponding to the COB spliced screen;
and judging whether the COB spliced screen is qualified or not according to the screen ink color non-uniformity and the pixel center distance corresponding to the COB spliced screen.
2. The method according to claim 1, wherein before the step of acquiring, by a preset color brightness acquirer, a screen-out brightness value corresponding to each display module in the COB spliced screen when the uniform ambient light is detected, the method further includes:
respectively acquiring the brightness values of a plurality of adjacent pixels in each lamp panel through a preset color brightness acquisition instrument, and determining the corresponding lamp panel brightness value based on the average value of the brightness values;
selecting a lamp panel brightness value corresponding to the first lamp panel as a standard brightness value, and respectively calculating brightness value difference values between the remaining lamp panel brightness values and the standard brightness value;
obtaining lamp panel gears corresponding to the lamp panels respectively based on the multiplication value of each brightness value difference value and preset lamp panel parameters;
and selecting a plurality of lamp panels according to the lamp panel gears for splicing to obtain the COB spliced screen.
3. The method of claim 2, wherein the lamp panel gears include positive and negative lamp panel gears; according to the lamp plate gear selects a plurality ofly the lamp plate splices, obtains the step of COB concatenation screen, includes:
selecting a preset number of first target lamp panels from the lamp panels associated with the positive lamp panel gears to splice to obtain a single display module;
selecting a preset number of second target lamp panels from the lamp panels associated with the negative lamp panel gears to splice to obtain a single display module;
responding to input planning information of the COB spliced screen, and splicing by adopting a plurality of display modules to obtain the COB spliced screen;
each gear span between the first target lamp panel or each second target lamp panel is smaller than or equal to a first preset span threshold value, and each gear span between the display modules is smaller than or equal to a second preset span threshold value.
4. The method as claimed in claim 1, wherein the step of calculating a brightness deviation value between two adjacent off-screen brightness values and selecting a plurality of display module pairs from the plurality of display modules according to the brightness deviation value comprises:
acquiring the total system resolution corresponding to the COB spliced screen;
judging whether the total system resolution is greater than a preset resolution threshold value or not;
if not, calculating a brightness deviation value between every two adjacent screen-off brightness values;
and selecting display module groups with the same number as the preset regions from high to low along the brightness deviation value.
5. The method of claim 4, further comprising:
if the total system resolution is greater than a preset resolution threshold, calculating the ratio of the total system resolution to the resolution threshold by adopting a rounding function to obtain the number of region divisions;
equally dividing the COB spliced screen according to the area dividing quantity to obtain a plurality of divided areas;
respectively calculating a brightness deviation value between every two adjacent screen-off brightness values in each divided area;
and selecting display module groups with the same number as that of the preset regions from the divided regions along the brightness deviation value from high to low.
6. The method according to claim 2, wherein the step of judging whether the COB tiled screen is qualified according to the screen ink color non-uniformity and the pixel center distance corresponding to the COB tiled screen comprises:
determining a corresponding ink color non-uniformity threshold value according to the pixel center distance corresponding to the COB spliced screen;
comparing the screen color non-uniformity to the ink color non-uniformity threshold;
if the screen ink color non-uniformity is larger than the ink color non-uniformity threshold value, judging that the COB spliced screen is unqualified;
and if the screen ink color non-uniformity is smaller than or equal to the ink color non-uniformity threshold value, judging that the COB spliced screen is qualified.
7. The method of claim 6, further comprising:
if judge that COB concatenation screen is unqualified, then jump the execution gather the luminance value of a plurality of adjacent pixels in each lamp plate respectively through predetermined colour luminance collection appearance, based on the step of the average value of luminance value confirms corresponding lamp plate luminance value, until judging COB concatenation screen is qualified.
8. The utility model provides a COB screen ink color verifying attachment which characterized in that includes:
the brightness value acquisition module is used for acquiring screen-off brightness values corresponding to the display modules in the COB spliced screen through a preset color brightness acquisition instrument when uniform ambient light is detected;
the display module group selection module is used for calculating a brightness deviation value between every two adjacent screen-off brightness values and selecting a plurality of display module groups from a plurality of display modules according to the brightness deviation value;
the ink color non-uniformity calculating module is used for respectively calculating the ink color non-uniformity corresponding to each display module group;
the screen ink color non-uniformity selecting module is used for selecting a maximum value from the plurality of ink color non-uniformities and determining the maximum value as the screen ink color non-uniformity corresponding to the COB spliced screen;
and the qualified judgment module is used for judging whether the COB spliced screen is qualified or not according to the screen ink color non-uniformity and the pixel center distance corresponding to the COB spliced screen.
9. An electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the computer program, when executed by the processor, causes the processor to perform the steps of the COB screen ink color checking method according to any one of claims 1 to 7.
10. A computer-readable storage medium on which a computer program is stored, the computer program implementing the COB screen ink color checking method according to any one of claims 1 to 7 when executed.
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