CN106652938B - Color temperature deviation adjusting method and system of liquid crystal display screen - Google Patents
Color temperature deviation adjusting method and system of liquid crystal display screen Download PDFInfo
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- CN106652938B CN106652938B CN201611157363.1A CN201611157363A CN106652938B CN 106652938 B CN106652938 B CN 106652938B CN 201611157363 A CN201611157363 A CN 201611157363A CN 106652938 B CN106652938 B CN 106652938B
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- G09G3/36—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 using liquid crystals
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Abstract
The invention discloses a color temperature deviation adjusting method of a liquid crystal display screen, which is applied to a glass backboard liquid crystal display screen with light entering from a single long side, and comprises the following steps: acquiring a current scanning line of the liquid crystal display screen and a line sequence number of the current scanning line, and acquiring an initial RGB semaphore of the current scanning line; acquiring the RGB signal compensation quantity of the current scanning line; and performing RGB signal display on the current scanning line according to the initial RGB signal amount and the RGB signal compensation amount of the current scanning line so as to adjust the color temperature deviation of the liquid crystal display screen. The invention also discloses a color temperature deviation adjusting system of the liquid crystal display screen. The technical scheme of the invention aims to avoid the phenomenon of uneven color temperature distribution of the liquid crystal display screen with the glass backboard allowing light to enter from the single long side.
Description
Technical Field
The invention relates to the technical field of liquid crystal display screens, in particular to a color temperature deviation adjusting method and a color temperature deviation adjusting system of a liquid crystal display screen.
Background
In order to achieve the object, a light guide plate and a back plate of a liquid crystal module are integrated into a design direction, and thus, various novel light guide materials are beginning to appear. In various novel leaded light materials, the backplate of glass material can satisfy the leaded light performance while, can satisfy higher intensity requirement again, consequently, the glass backplate becomes thin liquid crystal display's design first-selected.
The technical scheme has the disadvantages that light waves are transmitted in a transmission passage of the glass light guide plate, light with long wavelength can be gradually absorbed along with the extension of the optical path, the light color temperature which is closer to a light source is warmer, the light color temperature which is farther away from the light source is cooler, and the glass back plate liquid crystal display screen which enters light from the side of the single long side has the disadvantage of uneven color temperature distribution.
Disclosure of Invention
The invention mainly aims to provide a color temperature deviation adjusting method of a liquid crystal display screen, aiming at avoiding the phenomenon of uneven color temperature distribution of a glass backboard liquid crystal display screen with light entering from a single long side.
In order to achieve the above object, the color temperature deviation adjusting method of the liquid crystal display screen provided by the invention is applied to a glass backboard liquid crystal display screen with light entering from a single long side, and comprises the following steps:
acquiring a current scanning line of the liquid crystal display screen and a line sequence number of the current scanning line, and acquiring an initial RGB semaphore of the current scanning line;
acquiring the RGB signal compensation quantity of the current scanning line;
and performing RGB signal display on the current scanning line according to the initial RGB signal amount and the RGB signal compensation amount of the current scanning line so as to adjust the color temperature deviation of the liquid crystal display screen.
Preferably, the acquiring the compensation amount of the RGB signals of the current scanning line includes:
acquiring the total scanning line number of the liquid crystal display screen and the total color temperature deviation of the liquid crystal display screen;
calculating to obtain a color temperature compensation value of the current scanning line according to the color temperature total deviation, the total scanning line number and the line sequence number;
and determining the RGB signal compensation amount of the current scanning line according to the color temperature compensation value.
Preferably, the calculating the color temperature compensation value of the current scanning line according to the color temperature total deviation, the total scanning line number and the line number includes:
calculating to obtain the color temperature difference of adjacent scanning lines according to the color temperature total deviation and the total scanning line number;
setting the color temperature compensation value of the scanning line farthest from the light source as one half of the opposite part of the total deviation of the color temperature;
calculating to obtain a line number difference between the current scanning line and the scanning line with the farthest distance from the light source according to the line serial number;
and calculating to obtain the color temperature compensation value of the current scanning line according to the color temperature compensation value of the scanning line farthest away from the light source, the line number difference and the color temperature difference of the adjacent scanning line.
Preferably, the acquiring a current scanning line of the liquid crystal display screen and a line sequence number of the current scanning line includes:
acquiring a Vsync signal and an Hsync signal input to the liquid crystal display,
and determining the current scanning line of the liquid crystal display screen and the line sequence number of the current scanning line according to the synchronous information of the Vsync signal and the Hsync signal.
Preferably, the performing RGB signal display on the current scanning line according to the initial RGB signal amount and the RGB signal compensation amount of the current scanning line to adjust the color temperature deviation of the liquid crystal display screen includes:
according to the initial RGB signal quantity and the RGB signal compensation quantity of the current scanning line, carrying out summation operation on the initial RGB signal quantity and the RGB signal compensation quantity;
determining the sum of the initial RGB signal amount and the RGB signal compensation amount as the RGB signal correction amount of the current scanning line;
and performing RGB signal display on the current scanning line according to the RGB signal correction quantity so as to adjust the color temperature deviation of the liquid crystal display screen.
In addition, in order to achieve the above object, the present invention further provides a color temperature deviation adjusting system for a liquid crystal display, which is applied to a glass backplane liquid crystal display with light entering from a single long side, the color temperature deviation adjusting system for a liquid crystal display comprising:
the first acquisition module is used for acquiring a current scanning line of the liquid crystal display screen and a line sequence number of the current scanning line and acquiring an initial RGB semaphore of the current scanning line;
the second acquisition module is used for acquiring the RGB signal compensation quantity of the current scanning line;
and the display module is used for carrying out RGB signal display on the current scanning line according to the initial RGB signal amount and the RGB signal compensation amount of the current scanning line so as to adjust the color temperature deviation of the liquid crystal display screen.
Preferably, the second obtaining module includes:
the data acquisition unit is used for acquiring the total scanning line number of the liquid crystal display screen and the total color temperature deviation of the liquid crystal display screen;
the calculation unit is used for calculating and obtaining a color temperature compensation value of the current scanning line according to the color temperature total deviation, the total scanning line number and the line serial number;
and the first determining unit is used for determining the RGB signal compensation quantity of the current scanning line according to the color temperature compensation value.
Preferably, the calculation unit includes:
the first calculating subunit is used for calculating the color temperature difference of the adjacent scanning lines according to the color temperature total deviation and the total scanning line number;
the setting subunit is used for setting the color temperature compensation value of the scanning line which is farthest away from the light source to be one half of the opposite number of the total color temperature deviation;
the second calculating subunit is configured to calculate, according to the row sequence number, a row number difference between the current scanning row and the scanning row with the farthest distance from the light source;
and the third calculating subunit is used for calculating the color temperature compensation value of the current scanning line according to the color temperature compensation value of the scanning line which is farthest away from the light source, the line number difference and the color temperature difference of the adjacent scanning line.
Preferably, the first obtaining module includes:
a signal acquisition unit for acquiring a Vsync signal and an Hsync signal input to the liquid crystal display screen;
and the scanning line acquisition unit is used for determining the current scanning line of the liquid crystal display screen and the line sequence number of the current scanning line according to the synchronous information of the Vsync signal and the Hsync signal.
Preferably, the display module includes:
the summing unit is used for carrying out summation operation on the initial RGB signal quantity and the RGB signal compensation quantity according to the initial RGB signal quantity and the RGB signal compensation quantity of the current scanning line;
a second determining unit, configured to determine a sum of the initial RGB signal amount and the RGB signal compensation amount as an RGB signal correction amount of the current scanning line;
and the display unit is used for carrying out RGB signal display on the current scanning line according to the RGB signal correction quantity so as to adjust the color temperature deviation of the liquid crystal display screen.
In the technical scheme of the invention, the initial RGB semaphore of the current scanning line is obtained by obtaining the current scanning line of the liquid crystal display screen and the line sequence number of the current scanning line; acquiring the RGB signal compensation quantity of the current scanning line; and according to the initial RGB signal amount and the RGB signal compensation amount of the current scanning line, RGB signal display is carried out on the current scanning line so as to adjust the color temperature deviation of the liquid crystal display screen.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for adjusting color temperature deviation of a liquid crystal display panel according to a first embodiment of the present invention;
FIG. 2 is a comparison graph of a liquid crystal display screen according to the present invention after color temperature deviation adjustment;
FIG. 3 is a flowchart illustrating a color temperature deviation adjustment method for a liquid crystal display panel according to a second embodiment of the present invention;
FIG. 4 is a flowchart illustrating a color temperature deviation adjusting method for a liquid crystal display panel according to a third embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating a method for adjusting color temperature deviation of a liquid crystal display panel according to a fourth embodiment of the present invention;
FIG. 6 is a schematic view illustrating scanning line signal identification of the LCD panel according to the present invention;
FIG. 7 is a flowchart illustrating a fifth embodiment of a method for adjusting color temperature deviation of a liquid crystal display panel according to the present invention;
FIG. 8 is a schematic diagram illustrating RGB signal compensation of the color temperature deviation adjustment method of the LCD panel according to the present invention;
FIG. 9 is a functional block diagram of a color temperature deviation adjustment system of an LCD panel according to a first embodiment of the present invention;
FIG. 10 is a functional block diagram of a color temperature deviation adjustment system of an LCD panel according to a second embodiment of the present invention;
FIG. 11 is a functional block diagram of a color temperature deviation adjustment system of a liquid crystal display panel according to a third embodiment of the present invention;
FIG. 12 is a functional block diagram of a color temperature deviation adjustment system of a liquid crystal display panel according to a fourth embodiment of the present invention;
fig. 13 is a functional block diagram of a color temperature deviation adjustment system of an lcd according to a fifth embodiment of the present invention.
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a color temperature deviation adjusting method of a liquid crystal display screen.
Referring to fig. 1 and fig. 2, to achieve the above object, a first embodiment of the present invention provides a color temperature deviation adjusting method for a liquid crystal display screen, which is applied to a glass backplane liquid crystal display screen with light incident on a single long side, and the color temperature deviation adjusting method for the liquid crystal display screen includes the following steps:
step S10, acquiring a current scanning line of the liquid crystal display screen and a line sequence number of the current scanning line, and acquiring an initial RGB semaphore of the current scanning line;
step S20, obtaining the RGB signal compensation quantity of the current scanning line;
and step S30, according to the initial RGB signal amount and the RGB signal compensation amount of the current scanning line, performing RGB signal display on the current scanning line to adjust the color temperature deviation of the liquid crystal display screen.
In the technical scheme of the invention, the initial RGB semaphore of the current scanning line is obtained by obtaining the current scanning line of the liquid crystal display screen and the line sequence number of the current scanning line; acquiring the RGB signal compensation quantity of the current scanning line; and according to the initial RGB signal amount and the RGB signal compensation amount of the current scanning line, RGB signal display is carried out on the current scanning line so as to adjust the color temperature deviation of the liquid crystal display screen.
The liquid crystal display screen can be a display screen of a liquid crystal television, a display screen of a liquid crystal computer, a display screen of a notebook computer, or a display screen of an Ipad, and the types are not limited to this.
The glass light guide plate has the spectral absorption characteristic that the longer the optical path is, the more the long-wave spectral absorption is, so the color temperature gradually changes from warm to cold as the optical path is prolonged.
The color temperature of the liquid crystal display screen with light entering from the single long side changes depending on the position of the single long side light source, and the closer the position of the light source is, the warmer the color temperature is, and the farther the position of the light source is, the cooler the color temperature is.
For example, when the single long-side light source is arranged at the bottom of the liquid crystal display screen, the color temperature of each scanning line is gradually changed from warm to cold from the bottom to the top of the liquid crystal display screen; for another example, when the single long-side light source is disposed at the top of the liquid crystal display, from the top to the bottom of the liquid crystal display, the color temperature of each scanning line gradually changes from warm to cold, and therefore, the glass backboard liquid crystal display with light incident at the single long-side presents a phenomenon of uneven color temperature.
The liquid crystal display screen displays images in a progressive scanning mode, so that RGB signal compensation can be performed in a targeted manner aiming at each scanning line by identifying each scanning line signal of one image, the phenomenon of gradually uniform color temperature distribution is achieved, and the integral color temperature of the screen is more uniform.
The method comprises the steps of firstly identifying scanning line information for each scanning line of the liquid crystal display, then carrying out RGB signal compensation for the current scanning line, after completing RGB signal display of the current scanning line, then identifying next scanning line information in the scanning process of the next scanning line, and carrying out RGB signal compensation and display for the next scanning line until completing the RGB signal compensation and display process of all the scanning lines of the liquid crystal display so as to adjust the problem of uneven color temperature line by line.
In this embodiment, the field signal is used as a white field signal, and the single long-side light source is disposed at the bottom of the liquid crystal display screen, so as to facilitate subsequent description.
For white field signals, the color temperature is warmer the lower the B signal is, and cooler the color temperature is the higher the B signal is. Therefore, the color temperature appears to be warmed from cold from the scanning line farthest from the light source to the scanning line closest to the light source, and the B signal compensation amount of each scanning line is gradually increased from the scanning line farthest from the light source to the scanning line closest to the light source, so that the color temperature can be adjusted.
For example, the B signal compensation amount gradually increases from a negative value to a positive value from a scan line farthest from the light source to a scan line closest to the light source, to transition from the B signal compensation amount decreasing the B signal amount to the B signal compensation amount increasing the B signal amount.
Fig. 2 shows a display before the color temperature deviation adjustment of the liquid crystal display, the bottom of fig. 2 shows a single long side light source, the color temperature tends to be changed from warm to cold from the direction close to the light source to the direction far away from the light source, and the right side of fig. 2 shows a display after the liquid crystal display is subjected to the color temperature deviation adjustment of the invention, and the color temperature is uniform.
Referring to fig. 3, based on the first embodiment of the color temperature deviation adjusting method of the liquid crystal display panel according to the present invention, the second embodiment of the color temperature deviation adjusting method of the liquid crystal display panel according to the present invention, step S20 includes:
step S21, acquiring the total scanning line number of the liquid crystal display screen and the total color temperature deviation of the liquid crystal display screen;
step S22, calculating to obtain a color temperature compensation value of the current scanning line according to the color temperature total deviation, the total scanning line number and the line sequence number;
and step S23, determining the RGB signal compensation amount of the current scanning line according to the color temperature compensation value.
The total scanning line number of the liquid crystal display screen can be obtained by counting according to Vsync signals and Hsync signals input into the liquid crystal display screen, and the total color temperature deviation of the liquid crystal display screen can be obtained according to a color temperature test result.
The maximum color temperature Tmax of the liquid crystal display screen with the glass back plate with light incident on the single long side can be measured on a scanning line closest to the light source, and the minimum color temperature Tmix can be measured on a scanning line farthest from the light source, so that the total deviation of the color temperatures is Tmax-Tmin, wherein Tmax and Tmin are larger than zero.
The row sequence number is a scanning sequence number and is related to the scanning display sequence of the liquid crystal display screen.
The first scanning line can be the scanning line closest to the light source, and after the scanning line closest to the light source is scanned, scanning display is carried out in a direction far away from the light source line by line; the first scanning line may also be a scanning line farthest from the light source, and after the scanning line farthest from the light source is scanned, scanning display is performed in a direction close to the light source line by line.
Because the half display screen far away from the light source needs to be subjected to B signal reduction processing, and the half display screen near the light source needs to be subjected to B signal improvement processing. Therefore, when scanning is started from the scanning line farthest from the light source, the color temperature compensation value of the scanning line farthest from the light source can be set to- (Tmax-Tmin)/2, and the color temperature compensation value of each scanning line is calculated sequentially according to the scanning order, and it is easily understood that the color temperature compensation value of the last scanning line is (Tmax-Tmin)/2; when scanning is started from the scanning line closest to the light source, the color temperature compensation value of the scanning line closest to the light source can be set to be (Tmax-Tmin)/2, and the color temperature compensation value of each scanning line is obtained by sequentially calculating according to the scanning sequence, and the color temperature compensation value of the last scanning line is- (Tmax-Tmin)/2.
The RGB signal compensation amount of the current scanning line is determined according to the color temperature compensation value, and the color temperature compensation value is converted into an RGB signal compensation amount (in this embodiment, a B signal compensation amount) by a conversion coefficient a, where a > 0.
Referring to fig. 4, based on the second embodiment of the color temperature deviation adjusting method of the liquid crystal display panel according to the present invention, in the third embodiment of the color temperature deviation adjusting method of the liquid crystal display panel according to the present invention, step S22 includes:
step S22a, calculating the color temperature difference of adjacent scanning lines according to the total color temperature deviation and the total scanning line number;
step S22b, setting the color temperature compensation value of the scanning line farthest from the light source as the opposite half of the total deviation of the color temperature;
step S22c, calculating to obtain the line number difference between the current scanning line and the scanning line with the farthest distance from the light source according to the line serial number;
step S22d, calculating a color temperature compensation value of the current scanning line according to the color temperature compensation value of the scanning line farthest from the light source, the line number difference, and the color temperature difference of the adjacent scanning line.
In the present embodiment, the scanning line with the farthest distance from the light source is taken as the first scanning line for example, so as to facilitate description.
The color temperature difference △ between adjacent scan lines is (Tmax-Tmin)/(N-1), where N is the total number of scan lines and N is a positive integer multiple of 1080, such as 1080 or 2160.
The color temperature compensation value of the scanning line farthest from the light source is set to be the opposite half of the total deviation of the color temperature, and therefore, the color temperature compensation value is- (Tmax-Tmin)/((N-1) × 2).
The serial number of the current line is represented by n, and n is more than or equal to 1. The difference in the number of lines between the current scanning line and the first scanning line is n-1.
And obtaining a color temperature compensation value of-delta x (((N-1) -2 x (N-1))/2 of the current scanning line according to the color temperature compensation value- (Tmax-Tmin)/((N-1) × 2) of the scanning line farthest away from the light source, the line number difference N-1 and the color temperature difference △ of the adjacent scanning line.
Calculating a formula of-delta x (((N-1) -2 x (N-1))/2 according to the color temperature compensation value, and when N is 1, obtaining the color temperature compensation value of the 1 st row as- (Tmax-Tmin)/2; when n is 1080, the color temperature compensation value of the 1080 th line is (Tmax-Tmin)/2.
Setting the color temperature compensation value of the scanning line which is the farthest from the light source as half of the total deviation of the color temperatures, and obtaining the color temperature compensation value of the current scanning line as delta x (((N-1) -2 x (N-1))/2 according to the color temperature compensation value (Tmax-Tmin)/((N-1) × 2) of the scanning line which is the farthest from the light source, the line number difference N-1 and the color temperature difference △ of the adjacent scanning line.
Referring to fig. 5 and 6, based on the first embodiment of the color temperature deviation adjusting method of the liquid crystal display panel of the present invention and the fourth embodiment of the color temperature deviation adjusting method of the liquid crystal display panel of the present invention, step S10 includes:
step S11, acquiring Vsync signal and Hsync signal inputted to the liquid crystal display,
step S12, determining a current scanning line of the liquid crystal display screen and a line sequence number of the current scanning line according to synchronization information of the Vsync signal and the Hsync signal.
Signals input to the liquid crystal screen by the television core comprise a Vsync signal and an Hsync signal, and through counting of the Vsync signal and the Hsync signal, any scanning line of a picture can be identified, such as scanning behaviors H1, H2 or Hn.
For example, for a 4K tv, the resolution is 3840 × 2160, so the total scan line number of the lcd panel of the tv is 2160, and the counting process is: the first line sync is the first line from the field sync, the second line sync is the second line, and so on.
Referring to fig. 7 and 8, in a fifth embodiment of the color temperature deviation adjusting method for a liquid crystal display panel according to the present invention, based on any one of the first to fourth embodiments of the color temperature deviation adjusting method for a liquid crystal display panel, step S30 includes:
step S31, performing summation operation on the initial RGB signal amount and the RGB signal compensation amount according to the initial RGB signal amount and the RGB signal compensation amount of the current scanning line;
step S32, determining the sum of the initial RGB signal amount and the RGB signal compensation amount as the RGB signal correction amount of the current scanning line;
and step S33, performing RGB signal display on the current scanning line according to the RGB signal correction amount to adjust the color temperature deviation of the liquid crystal display.
The color temperature compensation value is converted into the RGB signal compensation amount by a conversion coefficient a, and in this embodiment, only the B signal in the RGB signal compensation amount has the compensation amount.
When the scanning line which is farthest away from the light source is adopted in the first scanning line, the color temperature compensation value of the current scanning line is- Δ × ((N-1) -2 × (N-1))/2, and thus, the B signal compensation value of the current scanning line is- Δ × a × ((N-1) -2 × (N-1))/2.
As can be seen from this, since the B signal compensation amount of the nth row is- Δ × ((N-1) -2 × (N-1))/2 according to the formula of calculation of the B signal compensation amount- Δ × a × ((N-1) -2 × (N-1))/2, the RGB signal correction amount of the nth scanning row is:
Rn'＝Rn；
Gn'＝Gn；
Bn'＝Bn-Δ*α*((N-1)-2*(n-1))/2。
when N is 1, the B signal compensation amount of the 1 st line is- Δ × α (N-1)/2, and therefore, the RGB signal correction amount of the first scanning line is:
R1'＝R1；
G1'＝G1；
B1'＝B1-Δ*α*(N-1)/2。
when n is 1080, the B signal compensation amount of the 1080 th line is (Tmax-Tmin)/2, so the RGB signal correction amount of the 1080 th scanning line is:
R1080'＝R1080；
G1080'＝G1080；
B1080'＝B1080+Δ*α*(N-1)/2。
of course, the scan line with the closest distance from the light source in the first scan line may also be adopted, and the correction amount of the RGB signal in the nth scan line may be obtained as follows:
Rn'＝Rn；
Gn'＝Gn；
Bn'＝Bn+Δ*α*((N-1)-2*(n-1))/2。
wherein Rn' is the R signal correction amount of the current scanning line, and Rn is the initial R signal amount of the current scanning line; gn' is the G signal correction amount of the current scanning line, and Gn is the initial G signal amount of the current scanning line; bn' is the correction amount of the B signal of the current scanning line, and Bn is the initial B signal amount of the current scanning line.
In addition, referring to fig. 2 and fig. 9, to achieve the above object, a first embodiment of the present invention provides a color temperature deviation adjusting system for a liquid crystal display panel, which is applied to a liquid crystal display panel with a glass backplane that lights on a single long side, the color temperature deviation adjusting system for a liquid crystal display panel including:
a first obtaining module 10, configured to obtain a current scanning line of the liquid crystal display and a line sequence number of the current scanning line, and obtain an initial RGB semaphore of the current scanning line;
a second obtaining module 20, configured to obtain an RGB signal compensation amount of the current scanning line;
and the display module 30 is configured to perform RGB signal display on the current scanning line according to the initial RGB signal amount and the RGB signal compensation amount of the current scanning line, so as to adjust the color temperature deviation of the liquid crystal display screen. The liquid crystal display screen can be a display screen of a liquid crystal television, a display screen of a liquid crystal computer, a display screen of a notebook computer, or a display screen of an Ipad, and the types are not limited to this.
The glass light guide plate has the spectral absorption characteristic that the longer the optical path is, the more the long-wave spectral absorption is, so the color temperature gradually changes from warm to cold as the optical path is prolonged.
The color temperature of the liquid crystal display screen with light entering from the single long side changes depending on the position of the single long side light source, and the closer the position of the light source is, the warmer the color temperature is, and the farther the position of the light source is, the cooler the color temperature is.
For example, when the single long-side light source is arranged at the bottom of the liquid crystal display screen, the color temperature of each scanning line is gradually changed from warm to cold from the bottom to the top of the liquid crystal display screen; for another example, when the single long-side light source is disposed at the top of the liquid crystal display, from the top to the bottom of the liquid crystal display, the color temperature of each scanning line gradually changes from warm to cold, and therefore, the glass backboard liquid crystal display with light incident at the single long-side presents a phenomenon of uneven color temperature.
The liquid crystal display screen displays images in a progressive scanning mode, so that RGB signal compensation can be performed in a targeted manner aiming at each scanning line by identifying each scanning line signal of one image, the phenomenon of gradually uniform color temperature distribution is achieved, and the integral color temperature of the screen is more uniform.
The method comprises the steps of firstly identifying scanning line information for each scanning line of the liquid crystal display, then carrying out RGB signal compensation for the current scanning line, after completing RGB signal display of the current scanning line, then identifying next scanning line information in the scanning process of the next scanning line, and carrying out RGB signal compensation and display for the next scanning line until completing the RGB signal compensation and display process of all the scanning lines of the liquid crystal display so as to adjust the problem of uneven color temperature line by line.
In this embodiment, the field signal is used as a white field signal, and the single long-side light source is disposed at the bottom of the liquid crystal display screen, so as to facilitate subsequent description.
For white field signals, the color temperature is warmer the lower the B signal is, and cooler the color temperature is the higher the B signal is. Therefore, the color temperature appears to be warmed from cold from the scanning line farthest from the light source to the scanning line closest to the light source, and the B signal compensation amount of each scanning line is gradually increased from the scanning line farthest from the light source to the scanning line closest to the light source, so that the color temperature can be adjusted.
For example, the B signal compensation amount gradually increases from a negative value to a positive value from a scan line farthest from the light source to a scan line closest to the light source, to transition from the B signal compensation amount decreasing the B signal amount to the B signal compensation amount increasing the B signal amount.
Fig. 2 shows a display before the color temperature deviation adjustment of the liquid crystal display, the bottom of fig. 2 shows a single long side light source, the color temperature tends to be changed from warm to cold from the direction close to the light source to the direction far away from the light source, and the right side of fig. 2 shows a display after the liquid crystal display is subjected to the color temperature deviation adjustment of the invention, and the color temperature is uniform.
Referring to fig. 10, based on the first embodiment of the color temperature deviation adjusting system of the liquid crystal display panel of the present invention, in the second embodiment of the color temperature deviation adjusting system of the liquid crystal display panel of the present invention, the second obtaining module 20 includes:
the data acquisition unit 21 is configured to acquire a total scanning line number of the liquid crystal display and a total color temperature deviation of the liquid crystal display;
the calculating unit 22 is configured to calculate a color temperature compensation value of the current scanning line according to the color temperature total deviation, the total scanning line number, and the line number;
a first determining unit 23, configured to determine an RGB signal compensation amount of the current scanning line according to the color temperature compensation value.
The total scanning line number of the liquid crystal display screen can be obtained by counting according to Vsync signals and Hsync signals input into the liquid crystal display screen, and the total color temperature deviation of the liquid crystal display screen can be obtained according to a color temperature test result.
The maximum color temperature Tmax of the liquid crystal display screen with the glass back plate with light incident on the single long side can be measured on a scanning line closest to the light source, and the minimum color temperature Tmix can be measured on a scanning line farthest from the light source, so that the total deviation of the color temperatures is Tmax-Tmin, wherein Tmax and Tmin are larger than zero.
The row sequence number is a scanning sequence number and is related to the scanning display sequence of the liquid crystal display screen.
The first scanning line can be the scanning line closest to the light source, and after the scanning line closest to the light source is scanned, scanning display is carried out in a direction far away from the light source line by line; the first scanning line may also be a scanning line farthest from the light source, and after the scanning line farthest from the light source is scanned, scanning display is performed in a direction close to the light source line by line.
Because the half display screen far away from the light source needs to be subjected to B signal reduction processing, and the half display screen near the light source needs to be subjected to B signal improvement processing. Therefore, when scanning is started from the scanning line farthest from the light source, the color temperature compensation value of the scanning line farthest from the light source can be set to- (Tmax-Tmin)/2, and the color temperature compensation value of each scanning line is calculated sequentially according to the scanning order, and it is easily understood that the color temperature compensation value of the last scanning line is (Tmax-Tmin)/2; when scanning is started from the scanning line closest to the light source, the color temperature compensation value of the scanning line closest to the light source can be set to be (Tmax-Tmin)/2, and the color temperature compensation value of each scanning line is obtained by sequentially calculating according to the scanning sequence, and the color temperature compensation value of the last scanning line is- (Tmax-Tmin)/2.
The RGB signal compensation amount of the current scanning line is determined according to the color temperature compensation value, and the color temperature compensation value is converted into an RGB signal compensation amount (in this embodiment, a B signal compensation amount) by a conversion coefficient a, where a > 0.
Referring to fig. 11, based on the second embodiment of the color temperature deviation adjusting system of the liquid crystal display panel of the present invention, and the third embodiment of the color temperature deviation adjusting system of the liquid crystal display panel of the present invention, the calculating unit 22 includes:
the first calculating subunit 22a is configured to calculate a color temperature difference between adjacent scanning lines according to the total color temperature deviation and the total scanning line number;
a setting subunit 22b, configured to set the color temperature compensation value of the scanning line farthest from the light source to be one half of the opposite of the total color temperature deviation;
the second calculating subunit 22c is configured to calculate, according to the row number, a row number difference between the current scanning row and the scanning row with the farthest distance from the light source;
and the third calculating subunit 22d is configured to calculate a color temperature compensation value of the current scanning line according to the color temperature compensation value of the scanning line farthest from the light source, the line number difference, and the color temperature difference of the adjacent scanning line.
In the present embodiment, the scanning line with the farthest distance from the light source is taken as the first scanning line for example, so as to facilitate description.
The color temperature difference △ between adjacent scan lines is (Tmax-Tmin)/(N-1), where N is the total number of scan lines and N is a positive integer multiple of 1080, such as 1080 or 2160.
The color temperature compensation value of the scanning line farthest from the light source is set to be the opposite half of the total deviation of the color temperature, and therefore, the color temperature compensation value is- (Tmax-Tmin)/((N-1) × 2).
The serial number of the current line is represented by n, and n is more than or equal to 1. The difference in the number of lines between the current scanning line and the first scanning line is n-1.
And obtaining a color temperature compensation value of-delta x (((N-1) -2 x (N-1))/2 of the current scanning line according to the color temperature compensation value- (Tmax-Tmin)/((N-1) × 2) of the scanning line farthest away from the light source, the line number difference N-1 and the color temperature difference △ of the adjacent scanning line.
Calculating a formula of-delta x (((N-1) -2 x (N-1))/2 according to the color temperature compensation value, and when N is 1, obtaining the color temperature compensation value of the 1 st row as- (Tmax-Tmin)/2; when n is 1080, the color temperature compensation value of the 1080 th line is (Tmax-Tmin)/2.
Setting the color temperature compensation value of the scanning line which is the farthest from the light source as half of the total deviation of the color temperatures, and obtaining the color temperature compensation value of the current scanning line as delta x (((N-1) -2 x (N-1))/2 according to the color temperature compensation value (Tmax-Tmin)/((N-1) × 2) of the scanning line which is the farthest from the light source, the line number difference N-1 and the color temperature difference △ of the adjacent scanning line.
Referring to fig. 6 and 12, based on the first embodiment of the color temperature deviation adjusting system of the liquid crystal display panel of the present invention and the fourth embodiment of the color temperature deviation adjusting system of the liquid crystal display panel of the present invention, the first obtaining module 10 includes:
a signal acquisition unit 11 for acquiring a Vsync signal and an Hsync signal input to the liquid crystal display screen;
a scan line obtaining unit 12, configured to determine a current scan line of the liquid crystal display screen and a line sequence number of the current scan line according to synchronization information of the Vsync signal and the Hsync signal.
Signals input to the liquid crystal screen by the television core comprise a Vsync signal and an Hsync signal, and through counting of the Vsync signal and the Hsync signal, any scanning line of a picture can be identified, such as scanning behaviors H1, H2 or Hn.
For example, for a 4K tv, the resolution is 3840 × 2160, so the total scan line number of the lcd panel of the tv is 2160, and the counting process is: the first line sync is the first line from the field sync, the second line sync is the second line, and so on.
Referring to fig. 8 and 13, based on any one of the first to fourth embodiments of the color temperature deviation adjusting system of the liquid crystal display panel of the present invention, in a fifth embodiment of the color temperature deviation adjusting system of the liquid crystal display panel of the present invention, the display module 30 includes:
a summing unit 31, configured to perform a summing operation on the initial RGB signal amount and the RGB signal compensation amount according to the initial RGB signal amount and the RGB signal compensation amount of the current scanning line;
a second determining unit 32, configured to determine a sum of the initial RGB signal amount and the RGB signal compensation amount as an RGB signal correction amount of the current scanning line;
and the display unit 33 is configured to perform RGB signal display on the current scanning line according to the RGB signal correction amount so as to adjust the color temperature deviation of the liquid crystal display screen.
The color temperature compensation value is converted into the RGB signal compensation amount by a conversion coefficient a, and in this embodiment, only the B signal in the RGB signal compensation amount has the compensation amount.
When the scanning line which is farthest away from the light source is adopted in the first scanning line, the color temperature compensation value of the current scanning line is- Δ × ((N-1) -2 × (N-1))/2, and thus, the B signal compensation value of the current scanning line is- Δ × a × ((N-1) -2 × (N-1))/2.
As can be seen from this, since the B signal compensation amount of the nth row is- Δ × ((N-1) -2 × (N-1))/2 according to the formula of calculation of the B signal compensation amount- Δ × a × ((N-1) -2 × (N-1))/2, the RGB signal correction amount of the nth scanning row is:
Rn'＝Rn；
Gn'＝Gn；
Bn'＝Bn-Δ*α*((N-1)-2*(n-1))/2。
when N is 1, the B signal compensation amount of the 1 st line is- Δ × α (N-1)/2, and therefore, the RGB signal correction amount of the first scanning line is:
R1'＝R1；
G1'＝G1；
B1'＝B1-Δ*α*(N-1)/2。
when n is 1080, the B signal compensation amount of the 1080 th line is (Tmax-Tmin)/2, so the RGB signal correction amount of the 1080 th scanning line is:
R1080'＝R1080；
G1080'＝G1080；
B1080'＝B1080+Δ*α*(N-1)/2。
of course, the scan line with the closest distance from the light source in the first scan line may also be adopted, and the correction amount of the RGB signal in the nth scan line may be obtained as follows:
Rn'＝Rn；
Gn'＝Gn；
Bn'＝Bn+Δ*α*((N-1)-2*(n-1))/2。
wherein Rn' is the R signal correction amount of the current scanning line, and Rn is the initial R signal amount of the current scanning line; gn' is the G signal correction amount of the current scanning line, and Gn is the initial G signal amount of the current scanning line; bn' is the correction amount of the B signal of the current scanning line, and Bn is the initial B signal amount of the current scanning line.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The method for adjusting the color temperature deviation of the liquid crystal display screen is characterized by being applied to the liquid crystal display screen with the glass backboard allowing light to enter from the side of a single long side, and comprises the following steps:
acquiring a current scanning line of the liquid crystal display screen and a line sequence number of the current scanning line, and acquiring an initial RGB semaphore of the current scanning line;
acquiring the RGB signal compensation quantity of the current scanning line;
performing RGB signal display on the current scanning line according to the initial RGB signal amount and the RGB signal compensation amount of the current scanning line so as to adjust the color temperature deviation of the liquid crystal display screen; the acquiring of the compensation quantity of the RGB signals of the current scanning line includes:
acquiring the total scanning line number of the liquid crystal display screen and the total color temperature deviation of the liquid crystal display screen;
calculating to obtain a color temperature compensation value of the current scanning line according to the color temperature total deviation, the total scanning line number and the line sequence number;
and determining the RGB signal compensation amount of the current scanning line according to the color temperature compensation value.
2. The method of claim 1, wherein the calculating a color temperature compensation value of the current scan line according to the total color temperature deviation, the total scan line number, and the line number comprises:
calculating to obtain the color temperature difference of adjacent scanning lines according to the color temperature total deviation and the total scanning line number;
setting the color temperature compensation value of the scanning line farthest from the light source as one half of the opposite part of the total deviation of the color temperature;
calculating to obtain a line number difference between the current scanning line and the scanning line with the farthest distance from the light source according to the line serial number;
and calculating to obtain the color temperature compensation value of the current scanning line according to the color temperature compensation value of the scanning line farthest away from the light source, the line number difference and the color temperature difference of the adjacent scanning line.
3. The method of claim 1, wherein the obtaining the current scanning line of the liquid crystal display and the line sequence number of the current scanning line comprises:
acquiring a Vsync signal and an Hsync signal input to the liquid crystal display,
and determining the current scanning line of the liquid crystal display screen and the line sequence number of the current scanning line according to the synchronous information of the Vsync signal and the Hsync signal.
4. The method of any one of claims 1 to 3, wherein the performing RGB signal display on the current scanning line according to the initial RGB signal amount and the RGB signal compensation amount of the current scanning line to adjust the color temperature deviation of the liquid crystal display screen comprises:
according to the initial RGB signal quantity and the RGB signal compensation quantity of the current scanning line, carrying out summation operation on the initial RGB signal quantity and the RGB signal compensation quantity;
determining the sum of the initial RGB signal amount and the RGB signal compensation amount as the RGB signal correction amount of the current scanning line;
and performing RGB signal display on the current scanning line according to the RGB signal correction quantity so as to adjust the color temperature deviation of the liquid crystal display screen.
5. The utility model provides a liquid crystal display's colour temperature deviation governing system, its characterized in that is applied to the glass backplate liquid crystal display of single long-side income light, liquid crystal display's colour temperature deviation governing system includes:
the first acquisition module is used for acquiring a current scanning line of the liquid crystal display screen and a line sequence number of the current scanning line and acquiring an initial RGB semaphore of the current scanning line;
the second acquisition module is used for acquiring the RGB signal compensation quantity of the current scanning line;
the display module is used for carrying out RGB signal display on the current scanning line according to the initial RGB signal amount and the RGB signal compensation amount of the current scanning line so as to adjust the color temperature deviation of the liquid crystal display screen; the second acquisition module includes:
the data acquisition unit is used for acquiring the total scanning line number of the liquid crystal display screen and the total color temperature deviation of the liquid crystal display screen;
the calculation unit is used for calculating and obtaining a color temperature compensation value of the current scanning line according to the color temperature total deviation, the total scanning line number and the line serial number;
and the first determining unit is used for determining the RGB signal compensation quantity of the current scanning line according to the color temperature compensation value.
6. The color temperature deviation adjusting system of a liquid crystal display panel according to claim 5, wherein said calculating unit comprises:
the first calculating subunit is used for calculating the color temperature difference of the adjacent scanning lines according to the color temperature total deviation and the total scanning line number;
the setting subunit is used for setting the color temperature compensation value of the scanning line which is farthest away from the light source to be one half of the opposite number of the total color temperature deviation;
the second calculating subunit is configured to calculate, according to the row sequence number, a row number difference between the current scanning row and the scanning row with the farthest distance from the light source;
and the third calculating subunit is used for calculating the color temperature compensation value of the current scanning line according to the color temperature compensation value of the scanning line which is farthest away from the light source, the line number difference and the color temperature difference of the adjacent scanning line.
7. The system of claim 5, wherein the first obtaining module comprises:
a signal acquisition unit for acquiring a Vsync signal and an Hsync signal input to the liquid crystal display screen;
and the scanning line acquisition unit is used for determining the current scanning line of the liquid crystal display screen and the line sequence number of the current scanning line according to the synchronous information of the Vsync signal and the Hsync signal.
8. The system of any of claims 5 to 7, wherein the display module comprises:
the summing unit is used for carrying out summation operation on the initial RGB signal quantity and the RGB signal compensation quantity according to the initial RGB signal quantity and the RGB signal compensation quantity of the current scanning line;
a second determining unit, configured to determine a sum of the initial RGB signal amount and the RGB signal compensation amount as an RGB signal correction amount of the current scanning line;
and the display unit is used for carrying out RGB signal display on the current scanning line according to the RGB signal correction quantity so as to adjust the color temperature deviation of the liquid crystal display screen.
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| CN101587703A (en) * | 2008-05-22 | 2009-11-25 | 纬创资通股份有限公司 | Method and device for adjusting color temperature coordinate value measured by color analyzer |
| WO2016141607A1 (en) * | 2015-03-09 | 2016-09-15 | 深圳市华星光电技术有限公司 | Driving method and driver device for liquid crystal display |
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