CN113920949A - 2D (two-dimensional) regional dimming system and method for LCD (liquid crystal display) spliced screen - Google Patents
2D (two-dimensional) regional dimming system and method for LCD (liquid crystal display) spliced screen Download PDFInfo
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- 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
- G09G3/34—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 by control of light from an independent source
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- G—PHYSICS
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- 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
- G09G3/34—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 by control of light from an independent source
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Abstract
The invention discloses a 2D regional dimming system and a method for an LCD (liquid crystal display) spliced screen, which comprises a main control computer, wherein the main control computer is connected with an RGB (red, green and blue) camera, a brightness meter, a lens hood and an LCD spliced control system; the main control computer is used for identifying and processing images acquired by the RGB camera, identifying splicing seams in the LCD splicing screen, and segmenting the LCD splicing screen to identify n LCD screens; the RGB camera is used for collecting the whole image of the LCD splicing screen; the light shield is used for placing the RGB camera and the LCD splicing control system and covers the LCD splicing screen to be detected; the LCD mosaic control system is used for changing the initial white output of an LCD screen into black output, and collecting images through an RGB camera. The system and the method can adjust the backlight of the LCD spliced screen through an algorithm, so that the spliced screen displays higher contrast, and the high dynamic illumination rendering display of the LCD spliced screen is improved.
Description
Technical Field
The invention belongs to the technical field of LCD (liquid crystal display) spliced screens and backlight area adjustment, and particularly relates to a 2D (two-dimensional) area dimming system and method for an LCD spliced screen.
Background
The LCD splicing screen is formed by splicing and displaying a plurality of LCD screens together, and the LCD splicing control system controls the split display content of each large screen, so that the display area is enlarged. Since the LCD does not emit light, it needs to use LEDs to provide backlight, and the conventional backlight is composed of a string of LEDs on one side of each tiled screen, which is called a global dimming method. However, the contrast of the LCD splicing screen in this scheme is insufficient, and it is not able to provide more dynamic representation and image details, and it is difficult to meet the screen technical standard of high dynamic range.
Disclosure of Invention
In order to overcome the technical problems, the invention provides a 2D area dimming system and method for an LCD tiled screen, so that the LCD tiled screen displays higher contrast, and high dynamic illumination rendering display of the LCD tiled screen is expected to be improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
A2D regional dimming system for an LCD splicing screen comprises a main control computer, wherein an RGB camera, a brightness meter, a light shield and an LCD splicing control system are connected to the main control computer;
the main control computer is used for identifying and processing images acquired by the RGB camera, identifying splicing seams in the LCD splicing screen, and dividing the LCD splicing screen into n LCD screens with the same size in equal area by taking the splicing seams as dividing lines;
the RGB camera is used for collecting the whole image of the LCD splicing screen;
the brightness meter is used for extracting brightness information of the LCD screen, and the obtained information is applied to 2D regional dimming;
the light shield is used for placing the RGB camera and the LCD splicing control system and covers the LCD splicing screen to be detected;
the LCD mosaic control system is used for changing the initial white color of each LCD screen into the black color of each LCD screen, outputting the RGB value of each LCD screen to be (255, 255, 255), outputting the RGB value of each LCD screen to be (0, 0, 0), and collecting images through the RGB cameras.
And the main control computer is connected with the LCD assembly control system, the RGB camera and the brightness meter through a kilomega network cable.
A2D regional dimming method for an LCD spliced screen comprises the following steps;
s100: the method comprises the following steps of covering an LCD splicing screen to be tested by using a light shield to prevent the influence of an external unstable light source on the accuracy of final verification in the subsequent steps, placing an RGB camera and a luminance meter in the light shield, and connecting an LCD splicing control system, the RGB camera and the luminance meter with a main control computer through a kilomega network cable;
s200: adjusting the LCD splicing screen to be white output through a main control computer, and collecting an integral image of the LCD splicing screen by using an RGB camera;
s300: carrying out edge identification sharpening processing on the acquired image by using a Sobel operator in a main control computer, identifying splicing seams in the LCD splicing screen, and segmenting the LCD splicing screen to identify n LCD screens;
s400: controlling an LCD splicing control system in a main control computer to change initial white output of an LCD screen into black output, acquiring an image through an RGB camera at the moment, identifying the corresponding LCD screen position in the RGB image by using the method in S300, marking the LCD screen position as a calibrated first LCD screen, and setting the output of the LCD screen as white;
s500: setting an LCD screen as white output by a main control computer, dividing the screen brightness into a plurality of values to be measured, sequentially adjusting the screen to corresponding brightness, extracting the brightness information of the LCD screen area by a brightness meter, operating a 2D area dimming algorithm by taking the information as a parameter, and compensating the area with darker backlight brightness to ensure that the brightness uniformity of the compensated LCD screen meets the brightness standard of the corresponding division;
s600: adjusting the brightness value of each LCD splicing screen by using an LCD splicing control system through a main control computer and using a method of S500, so that the actual brightness values of n LCD screens under each divided brightness are displayed as corresponding standard brightness values;
s700: the method comprises the steps of setting the whole LCD spliced screen to be white output through a main control computer, adjusting screen brightness to be measured values in a test set according to verification requirements, sequentially extracting LCD screen area brightness through a brightness meter, comparing test actual brightness with a standard brightness nit value to serve as judgment basis of 2D area dimming check effect of the LCD spliced screen, and storing a proper algorithm compensation function.
In the step S100, the light shield is used to shield the LCD splicing screen to be tested, so as to prevent the influence of external unstable light sources in subsequent steps from affecting the accuracy of final verification, and the RGB camera, the luminance meter and the LCD splicing control system are also placed inside the light shield and are respectively connected with the main control computer through the gigabit network cable, so that the RGB camera, the luminance meter and the LCD splicing control system can perform data interaction with the main control computer and can perform adjustment control on the RGB camera, the luminance meter and the LCD splicing control system through the main control computer.
In the step S200, an instruction is issued to the LCD mosaic control system by the main control computer, the LCD mosaic screen is adjusted to be white for output, and an image acquisition instruction is issued to the RGB camera by the main control computer at this time, so as to obtain an RGB image including a plurality of LCD screens which are white and splicing seams which are black.
In the step S300, the RGB images collected in S200 are used, and the Sobel operator is used to perform edge detection and sharpening on the images to obtain binary images of the RGB images, because the gray values of the white LCD screen and the black splicing seam are very different, the splicing seam in the binary images is identified, and n LCD screens, which are 1, 2, and 3 … … n, are identified.
In the LCD mosaic control system in step S400, n LCD screens are also controlled, the number in the LCD mosaic control system is matched with the LCD screen shot and identified by the actual RGB camera, the LCD mosaic control system connected with the main control computer first issues an instruction to output black to the first LCD screen of the number in the LCD mosaic control system, at this time, in the image shot by the RGB camera, it is identified that one screen becomes black, the screen is marked as the first LCD screen, after the marking is completed, the LCD screen is set to white again, and according to this method, the n LCD screens identified in step S400 are marked in sequence.
In the step S500, a main control computer uses an LCD mosaic control system to send a white command to an LCD screen, and adjusts the brightness into a plurality of equally divided values to be measured by changing the duty ratio of the LED forward current according to the brightness adjustable range of the screen itself by using a pulse width adjustment technique, wherein the values include a nit value and a maximum nit value, so as to perform algorithm optimization on each brightness region including a dark region and a bright region. The method comprises the steps of sequentially extracting brightness information of LCD screen areas through a brightness meter, wherein each area is composed of a plurality of matrix partitions, operating a 2D area dimming algorithm by taking the brightness information as a parameter, obtaining a probability density distribution curve by drawing a gray level histogram of the whole image through statistics, integrating the curve to obtain an accumulated distribution function curve, inverting the curve in a rectangular coordinate system to obtain a compensation function, and compensating the area with darker backlight brightness through the algorithm, so that the brightness uniformity of the compensated LCD screen accords with correspondingly divided brightness standards.
In the step S600, the LCD mosaic control system is used to send an instruction to the LCD screen through the main control computer, in order to reduce color cast, the pulse width modulation technology is used to adjust the screen brightness, the brightness information is extracted through the luminance meter, and the luminance information is used as a parameter to run the 2D area dimming algorithm, so as to adjust the brightness value of each LCD mosaic screen, and thus n LCD screens are all adjusted to the standard brightness value.
In the step S700, a main control computer uses an LCD mosaic control system to send a white instruction to an LCD screen, the screen brightness is sequentially adjusted to be measured values in a test set, brightness information is extracted by a brightness meter, and the information is substituted as an x value on an abscissa axis into the 2D regional dimming algorithm compensation function in the step S500 to obtain a test actual brightness value on a corresponding ordinate. Comparing it with a standard brightness value if
And if the brightness of the LCD splicing screen is within the verification standard, storing the algorithm compensation function, and using the function as the brightness compensation rule of the LCD splicing screen, otherwise, returning to the step S500, dividing the brightness to be measured values again, and increasing the number of the brightness to be measured values to improve the accuracy of the algorithm until the brightness standard is met.
The invention has the beneficial effects that:
the system is easy to operate, the main control computer can input different instructions to each instrument to control the work of the instrument, and the output result of each instrument is sent to the main control computer to calculate and finish dimming.
The method of the invention adds the related method of the backlight area adjusting technology, so that the method is further improved through program automatic calculation, and the optimal selection is automatically carried out through the algorithm programmed by the program, thereby greatly improving the dimming accuracy of the LCD splicing screen.
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Fig. 1 is a structural composition diagram of a 2D local dimming system for an LCD tiled screen.
Fig. 2 is a flow chart of a 2D zone dimming method for an LCD tiled screen.
Detailed Description
The present invention will be described in further detail with reference to examples.
The embodiment of the invention discloses a 2D regional dimming system and a method for an LCD spliced screen, wherein the method comprises the following steps: covering the LCD splicing screen to be tested by using a light shield, placing the RGB camera and the brightness meter in the light shield, and connecting the LCD splicing control system, the RGB camera and the brightness meter with a main control computer through a kilomega network cable; then, by simple operation on the main control computer, the main control computer performs a series of operations in the S200-S700 party in an automatic operation mode; and finally outputting the large LCD screen successfully verified and adjusted.
As shown in fig. 1, the 2D area dimming system for the LCD mosaic screen provided by the present invention includes a main control computer, and an RGB camera, a light shield, a luminance meter and an LCD mosaic control system connected to the main control computer.
As shown in fig. 2, the present invention provides a 2D area dimming method for a tiled LCD screen, the method comprising:
s100: the method comprises the following steps of covering an LCD splicing screen to be tested by using a light shield to prevent the influence of an external unstable light source on the accuracy of final verification in the subsequent steps, placing an RGB camera and a luminance meter in the light shield, and connecting an LCD splicing control system, the RGB camera and the luminance meter with a main control computer through a kilomega network cable;
s200: adjusting the LCD splicing screen to be white output through a main control computer, and collecting an integral image of the LCD splicing screen by using an RGB camera;
s300: carrying out edge identification sharpening processing on the acquired image by using a Sobel operator in a main control computer, identifying splicing seams in the LCD splicing screen, and segmenting the LCD splicing screen to identify n LCD screens;
s400: controlling an LCD splicing control system in a main control computer to change initial white output of an LCD screen into black output, acquiring an image through an RGB camera at the moment, identifying the corresponding LCD screen position in the RGB image by using the method in S300, marking the LCD screen position as a calibrated first LCD screen, and setting the output of the LCD screen as white;
s500: the method comprises the steps of setting an LCD screen to be white for output through a main control computer, dividing screen brightness into a plurality of values to be measured, sequentially adjusting the screen to corresponding brightness, extracting regional brightness information of the LCD screen through a brightness meter, operating a 2D regional dimming algorithm by taking the information as a parameter, and compensating a region with darker backlight brightness, so that the brightness uniformity of the compensated LCD screen meets the brightness standard of corresponding division.
S600: and adjusting the brightness value of each LCD splicing screen by using an LCD splicing control system through a main control computer and using an S500 method, so that the actual brightness values of the n LCD screens under each divided brightness are displayed as corresponding standard brightness values.
S700, setting the whole LCD spliced screen as white output through a main control computer, respectively adjusting the screen brightness to be measured values in a test set according to verification requirements, sequentially extracting the regional brightness of the LCD screen through a brightness meter, comparing the actual brightness of the test with a standard brightness nit value, serving as a judgment basis of the 2D regional dimming verification effect of the LCD spliced screen, and storing a proper algorithm compensation function.
The method is used for dimming verification of the LCD spliced screen. The invention discloses a 2D regional dimming system and method for an LCD splicing screen, aiming at the fact that the LCD splicing screen is not enough in contrast, cannot provide more dynamic representation and image details and is difficult to meet the technical standard of a screen with a high dynamic range because the LCD does not emit light and needs to be provided with backlight by using an LED (light emitting diode). The system and the method can adjust the backlight of the LCD spliced screen through an algorithm, so that the spliced screen displays higher contrast, and the high dynamic illumination rendering display of the LCD spliced screen is improved.
The above steps of the present invention will be described in detail below.
S100: and covering the LCD splicing screen to be detected by using a light shield, placing the RGB camera and the brightness meter in the light shield, and connecting the LCD splicing control system, the RGB camera and the brightness meter with the main control computer through the kilomega network cable.
The method comprises the steps that firstly, a light shield covers an LCD splicing screen to be detected, the influence of an external unstable light source on the LCD splicing screen in the subsequent steps is prevented, and the influence on the accuracy of final verification is avoided.
S200: and adjusting the LCD spliced screen to be white output by a main control computer, and acquiring images by an RGB camera.
The 2D regional dimming for the LCD splicing screen provided by the invention issues an instruction to the LCD splicing control system through the main control computer, and the LCD splicing screen is adjusted to be white for output. At the moment, an image acquisition instruction is issued to the RGB camera through the main control computer, and an RGB image with a plurality of white LCD screens and black splicing seams can be obtained.
S300: and (3) carrying out edge detection sharpening processing on the RGB image by using a Sobel operator in a main control computer, identifying splicing seams in the LCD splicing screen, and segmenting the LCD splicing screen to identify n LCD screens.
And (5) using the S200 collected RGB images, and carrying out edge detection and sharpening on the images by using a Sobel operator to obtain a binary image of the RGB image. Since the gray values of the white LCD screen and the black stitching seams are very different, the stitching seams in the binary image can be easily identified, and n LCD screens, 1, 2, 3 … … n respectively, can be identified.
S400: and controlling the LCD splicing control system in the main control computer to change the initial white output of the first LCD screen into black output, acquiring images through the RGB camera at the moment, identifying the corresponding LCD screen position in the RGB images by using the method in S300, marking the LCD screen position as the calibrated first LCD screen, and setting the output of the LCD screen as white. According to the method, the n LCD screens are calibrated by the same method, and the matching relation between the serial number of the LCD screen in the LCD mosaic control system and the LCD screen shot by the actual RGB camera is found out.
In the LCD mosaic system, n LCD screens can be controlled, and the following embodiments aim to match the numbers in the LCD mosaic system with the LCD screens photographed and recognized by the actual RGB cameras. Firstly, an LCD splicing control system connected with a main control computer issues an instruction for outputting black to a first numbered LCD screen in the LCD splicing control system, at the moment, a screen is identified to be black in an image shot by an RGB camera, the screen is marked as the first LCD screen, and after the marking is finished, the LCD screen is set to be white again. In this way, the n LCD screens recognized in step S400 are sequentially numbered.
S500: the method comprises the steps of setting an LCD screen to be white for output through a main control computer, dividing screen brightness into a plurality of values to be measured, sequentially adjusting the screen to corresponding brightness, extracting regional brightness information of the LCD screen through a brightness meter, operating a 2D regional dimming algorithm by taking the information as a parameter, and compensating a region with darker backlight brightness, so that the brightness uniformity of the compensated LCD screen meets the brightness standard of corresponding division.
The main control computer sends a white instruction to an LCD screen by utilizing an LCD splicing control system, the brightness is respectively adjusted into a plurality of equally divided measured values by adopting a pulse width adjusting technology and changing the duty ratio of the forward current of the LED according to the adjustable range of the brightness of the screen, wherein the measured values need to comprise a nit value and a maximum nit value and are used for carrying out algorithm optimization on each brightness area comprising a dark area and a bright area. The method comprises the steps of sequentially extracting brightness information of LCD screen areas through a brightness meter, wherein each area is composed of a plurality of matrix partitions, operating a 2D area dimming algorithm by taking the brightness information as a parameter, obtaining a probability density distribution curve by drawing a gray level histogram of the whole image through statistics, integrating the curve to obtain an accumulated distribution function curve, inverting the curve in a rectangular coordinate system to obtain a compensation function, and compensating the area with darker backlight brightness through the algorithm, so that the brightness uniformity of the compensated LCD screen accords with correspondingly divided brightness standards.
S600: and adjusting the brightness value of each LCD splicing screen by using an LCD splicing control system through a main control computer and using an S500 method, so that the actual brightness values of the n LCD screens under each divided brightness are displayed as corresponding standard brightness values.
The main control computer sends an instruction to the LCD screen by using the LCD splicing control system, in order to reduce color cast, the brightness of the screen is adjusted by adopting a pulse width adjusting technology, brightness information is extracted by a brightness meter and used as a parameter to run a 2D regional dimming algorithm, and the brightness value of each LCD splicing screen is adjusted, so that n LCD screens are all adjusted to a standard brightness value.
S700: the method comprises the steps of setting the whole LCD spliced screen to be white output through a main control computer, adjusting screen brightness to be measured values in a test set according to verification requirements, sequentially extracting LCD screen area brightness through a brightness meter, comparing test actual brightness with a standard brightness nit value to serve as judgment basis of 2D area dimming check effect of the LCD spliced screen, and storing a proper algorithm compensation function.
And sending a white instruction to the LCD screen by using the LCD splicing control system through the main control computer. In order to improve the verification accuracy, the test set needs to be divided as much as possible, the screen brightness is sequentially adjusted to be measured values in the test set, brightness information is extracted through a brightness meter, the information is used as an x value on the abscissa axis and is substituted into the 2D regional dimming algorithm compensation function in the step S500, and a test actual brightness value on the corresponding ordinate is obtained. Comparing it with a standard brightness value if
And if the brightness of the LCD splicing screen is within the verification standard, storing the algorithm compensation function, and using the function as the brightness compensation rule of the LCD splicing screen, otherwise, returning to the step S500, dividing the brightness to be measured values again, and increasing the number of the brightness to be measured values to improve the accuracy of the algorithm until the brightness standard is met.
Claims (10)
1. A2D regional dimming system for an LCD splicing screen is characterized by comprising a main control computer, wherein the main control computer is connected with an RGB camera, a brightness meter, a lens hood and an LCD splicing control system;
the main control computer is used for identifying and processing images acquired by the RGB camera, identifying splicing seams in the LCD splicing screen, and segmenting the LCD splicing screen by taking the splicing seams as dividing lines to identify n LCD screens;
the RGB camera is used for collecting the whole image of the LCD splicing screen;
the brightness meter is used for extracting brightness information of the LCD screen, and the obtained information is applied to 2D regional dimming;
the light shield is used for placing the RGB camera and the LCD splicing control system and covers the LCD splicing screen to be detected;
the LCD mosaic control system is used for changing the initial white color of each LCD screen into the black color of each LCD screen, outputting the RGB value of each LCD screen to be (255, 255, 255), outputting the RGB value of each LCD screen to be (0, 0, 0), and collecting images through the RGB cameras.
2. The 2D zone dimming system for LCD tiled screens according to claim 1,
and the main control computer is connected with the LCD assembly control system, the RGB camera and the brightness meter through a kilomega network cable.
3. The dimming method of the 2D area dimming system for the LCD tiled screen according to claim 1 or 2, comprising the following steps;
s100: the method comprises the following steps of covering an LCD splicing screen to be tested by using a light shield to prevent the influence of an external unstable light source on the accuracy of final verification in the subsequent steps, placing an RGB camera and a luminance meter in the light shield, and connecting an LCD splicing control system, the RGB camera and the luminance meter with a main control computer through a kilomega network cable;
s200: adjusting the LCD splicing screen to be white output through a main control computer, and collecting an integral image of the LCD splicing screen by using an RGB camera;
s300: carrying out edge identification sharpening processing on the acquired image by using a Sobel operator in a main control computer, identifying splicing seams in the LCD splicing screen, and segmenting the LCD splicing screen to identify n LCD screens;
s400: controlling an LCD splicing control system in a main control computer to change initial white output of an LCD screen into black output, acquiring an image through an RGB camera at the moment, identifying the corresponding LCD screen position in the RGB image by using the method in S300, marking the LCD screen position as a calibrated first LCD screen, and setting the output of the LCD screen as white;
s500: setting an LCD screen as white output by a main control computer, dividing the screen brightness into a plurality of values to be measured, sequentially adjusting the screen to corresponding brightness, extracting the brightness information of the LCD screen area by a brightness meter, operating a 2D area dimming algorithm by taking the information as a parameter, and compensating the area with darker backlight brightness to ensure that the brightness uniformity of the compensated LCD screen meets the brightness standard of the corresponding division;
s600: adjusting the brightness value of each LCD splicing screen by using an LCD splicing control system through a main control computer and using a method of S500, so that the actual brightness values of n LCD screens under each divided brightness are displayed as corresponding standard brightness values;
s700: the method comprises the steps of setting the whole LCD spliced screen to be white output through a main control computer, adjusting screen brightness to be measured values in a test set according to verification requirements, sequentially extracting LCD screen area brightness through a brightness meter, comparing test actual brightness with a standard brightness nit value to serve as judgment basis of 2D area dimming check effect of the LCD spliced screen, and storing a proper algorithm compensation function.
4. The 2D area dimming method for the LCD mosaic screen according to claim 3, wherein in step S100, the LCD mosaic screen to be tested is first shielded by a light shield to prevent the LCD mosaic screen from being affected by external unstable light sources in subsequent steps, which may affect the accuracy of final verification, and the RGB camera, the luminance meter and the LCD mosaic control system are also placed inside the light shield and are connected to the main control computer through gigabit cables, respectively, so that the RGB camera, the luminance meter and the LCD mosaic control system can perform data interaction with the main control computer and can be adjusted and controlled by the main control computer.
5. The 2D local dimming method for the LCD mosaic screen according to claim 3, wherein in step S200, the main control computer issues an instruction to the LCD mosaic control system to adjust the LCD mosaic screen to white output, and at this time, the main control computer issues an image acquisition instruction to the RGB camera to obtain an RGB image with a plurality of LCD screens being white and the mosaic seams being black.
6. The 2D local dimming method for the LCD mosaic screen according to claim 3, wherein in step S300, the RGB images collected in S200 are used, the image is subjected to edge detection and sharpening by using Sobel operator to obtain a binary image of the RGB image, since the gray values of the white LCD screen and the black mosaic seam are very different, the mosaic seam in the binary image is identified, and n LCD screens, 1, 2 and 3 … … n respectively, are identified.
7. The 2D area dimming method for the LCD mosaic screen according to claim 3, wherein the LCD mosaic system in step S400 has n LCD screens for control, the number in the LCD mosaic system is matched with the LCD screen shot and identified by the actual RGB camera, the LCD mosaic system connected with the main control computer issues an instruction to output black to the first LCD screen of the number in the LCD mosaic system, at this time, one screen is identified to be black in the image shot by the RGB camera, the screen is marked as the first LCD screen, and after the marking is completed, the LCD screen is set to white again, according to this method, the n LCD screens identified in step S400 are all marked in sequence.
8. The 2D area dimming method for the LCD mosaic screen according to claim 3, wherein in step S500, the LCD mosaic system is utilized to send a white command to an LCD screen through the main control computer, and the brightness is adjusted to a plurality of equally divided values to be measured by changing the LED forward current duty ratio according to the adjustable range of the brightness of the screen, wherein the values include a nit and a maximum nit, so as to perform algorithm optimization on each brightness area including a dark area and a bright area. The method comprises the steps of sequentially extracting brightness information of LCD screen areas through a brightness meter, wherein each area is composed of a plurality of matrix partitions, operating a 2D area dimming algorithm by taking the brightness information as a parameter, obtaining a probability density distribution curve by drawing a gray level histogram of the whole image through statistics, integrating the curve to obtain an accumulated distribution function curve, inverting the curve in a rectangular coordinate system to obtain a compensation function, and compensating the area with darker backlight brightness through the algorithm, so that the brightness uniformity of the compensated LCD screen accords with correspondingly divided brightness standards.
9. The 2D area dimming method for the LCD mosaic screen according to claim 3, wherein in step S600, the main control computer sends an instruction to the LCD screen by using the LCD mosaic system, in order to reduce color cast, the pulse width modulation technique is used to adjust the screen brightness, the brightness information is extracted by the brightness meter and used as a parameter to run the 2D area dimming algorithm, and the brightness value of each LCD mosaic screen is adjusted, so that n LCD screens are all adjusted to a standard brightness value.
10. The 2D local dimming method for the LCD mosaic screen according to claim 3, wherein in step S700, the LCD mosaic control system is used to send a white command to the LCD screen through the main control computer, the screen brightness is sequentially adjusted to the to-be-measured values in the test set, the brightness information is extracted through the brightness meter, and the information is substituted as the x value on the abscissa axis into step S50And (5) obtaining a test actual brightness value on a corresponding ordinate by using a 2D regional dimming algorithm compensation function in the step 0. Comparing it with a standard brightness value if
And if the brightness of the LCD splicing screen is within the verification standard, storing the algorithm compensation function, and using the function as the brightness compensation rule of the LCD splicing screen, otherwise, returning to the step S500, dividing the brightness to be measured values again, and increasing the number of the brightness to be measured values to improve the accuracy of the algorithm until the brightness standard is met.
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| CN202111186046.3A Pending CN113920949A (en) | 2021-10-12 | 2021-10-12 | 2D (two-dimensional) regional dimming system and method for LCD (liquid crystal display) spliced screen |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013175853A (en) * | 2012-02-24 | 2013-09-05 | Sharp Corp | Liquid crystal display device |
| CN107689214A (en) * | 2016-08-05 | 2018-02-13 | 青岛海信电器股份有限公司 | The backlight adjusting method and device of a kind of intelligent display device |
| CN113473100A (en) * | 2021-06-29 | 2021-10-01 | 西安热工研究院有限公司 | Color difference checking and adjusting system and method for LCD spliced screen |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013175853A (en) * | 2012-02-24 | 2013-09-05 | Sharp Corp | Liquid crystal display device |
| CN107689214A (en) * | 2016-08-05 | 2018-02-13 | 青岛海信电器股份有限公司 | The backlight adjusting method and device of a kind of intelligent display device |
| CN113473100A (en) * | 2021-06-29 | 2021-10-01 | 西安热工研究院有限公司 | Color difference checking and adjusting system and method for LCD spliced screen |
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