CN109658884B - Driving method and driving system of display panel and display device - Google Patents
Driving method and driving system of display panel and display device Download PDFInfo
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- CN109658884B CN109658884B CN201811510628.0A CN201811510628A CN109658884B CN 109658884 B CN109658884 B CN 109658884B CN 201811510628 A CN201811510628 A CN 201811510628A CN 109658884 B CN109658884 B CN 109658884B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—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
- 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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
Abstract
The invention discloses a driving method, a driving system and a display device of a display panel, comprising the following steps: receiving a first color signal under an RGB system, and converting the first color signal into a first color space signal under an HSV system; acquiring a current color saturation signal of the first color space signal, and acquiring a preset adjustment coefficient corresponding to the current color saturation signal; respectively adjusting the current color saturation signals by using preset adjustment coefficients; completing adjustment processing of the color saturation signal to obtain a second color space signal under an HSV system; and converting the second color space signal into a second color signal under an RGB system to drive the display panel. The invention can improve the color cast problem.
Description
Technical Field
The present invention relates to the field of display panel technologies, and in particular, to a driving method, a driving system, and a display device for a display panel.
Background
With the development and progress of science and technology, the lcd has thin body, low power consumption, low radiation, and other hot spots, and thus is the mainstream product of the lcd and widely used. Most of the existing liquid crystal displays in the market are backlight liquid crystal displays (lcds), which include a liquid crystal panel and a backlight module (backlight module). The liquid crystal panel has the working principle that liquid crystal molecules are placed in two parallel glass substrates, and a driving voltage is applied to the two glass substrates to control the rotation direction of the liquid crystal molecules so as to refract light rays of the backlight module out to generate a picture.
Most of the existing large-size liquid crystal display panels adopt a VA (Vertical Alignment) liquid crystal or IPS (In-Plane Switching) liquid crystal technology, and the VA liquid crystal technology has the advantages of higher production efficiency and lower manufacturing cost compared with the IPS liquid crystal technology, but has a more obvious optical property defect compared with the IPS liquid crystal technology In terms of optical property; that is, some large-sized display panels, particularly VA-mode liquid crystal driving, have a color shift problem at a large viewing angle.
Disclosure of Invention
The invention aims to provide a driving method, a driving system and a display device of a display panel, which can better solve the problem of color cast of a large visual angle.
In order to achieve the above object, the present invention provides a driving method of a display panel, comprising the steps of:
receiving a first color signal under an RGB system, and converting the first color signal into a first color space signal under an HSV system;
acquiring a current color saturation signal of the first color space signal, and acquiring a preset adjustment coefficient corresponding to the current color saturation signal;
respectively adjusting the current color saturation signals by using preset adjustment coefficients;
completing adjustment processing of the color saturation signal to obtain a second color space signal under an HSV system;
and converting the second color space signal into a second color signal under an RGB system to drive the display panel.
Optionally, the adjusting process includes a step of performing color saturation value reduction processing on all color saturation signals according to a preset adjustment coefficient.
Optionally, the color saturation signal is split into at least a first hue interval, a second hue interval and a third hue interval according to hue differences;
in the step of obtaining the preset adjustment coefficient corresponding to the current color saturation signal:
and corresponding to the same tone, the larger the color saturation value of the current color saturation signal is, the larger the adjustment amplitude of the adjustment processing is.
Optionally, the color saturation signal is split into at least a first hue interval, a second hue interval and a third hue interval according to hue differences;
in the step of obtaining the preset adjustment coefficient corresponding to the current color saturation signal:
and the preset adjustment coefficients corresponding to the current color saturation signals with the same color saturation value are different corresponding to the first color tone interval, the second color tone interval and the third color tone interval.
Optionally, the first hue interval, the second hue interval and the third hue interval are a red hue interval, a green hue interval and a blue hue interval, respectively;
the adjustment amplitude of the preset adjustment coefficient corresponding to the blue hue interval on the current color saturation signal is larger than the adjustment amplitude of the preset adjustment coefficient corresponding to the red hue interval on the current color saturation signal; the adjustment amplitude of the preset adjustment coefficient corresponding to the red hue interval to the current color saturation signal is larger than the adjustment amplitude of the preset adjustment coefficient corresponding to the green hue interval to the current color saturation signal.
Optionally, the color saturation signal is split into at least a red hue interval, a green hue interval and a blue hue interval according to different hues;
the red tone interval, the green tone interval and the blue tone interval are respectively and correspondingly preset and adjusted to be a red adjusting coefficient, a green adjusting coefficient and a blue adjusting coefficient;
the red adjustment coefficient, the green adjustment coefficient and the blue adjustment coefficient are constants;
the adjustment amplitude of the red adjustment coefficient to the color saturation signal is larger than the adjustment amplitude of the green adjustment coefficient to the color saturation signal and smaller than the adjustment amplitude of the blue adjustment coefficient to the color saturation signal.
Optionally, the range of the Hue value Hue is: 0-360, corresponding to 0-360 degrees, wherein,
the hue range in which the hue value satisfies the following formula is a red hue range: hue is more than or equal to 0 and less than 60, or Hue is more than 300 and less than or equal to 360;
the hue range in which the hue value satisfies the following formula is a green hue range: hue is more than or equal to 60 and less than or equal to 180;
the hue range in which the hue value satisfies the following formula is a blue hue range: hue is more than or equal to 180 and less than or equal to 300.
Optionally, the preset adjustment coefficient is obtained by calculation according to a preset calculation formula or by searching through an adjustment coefficient lookup table;
the second color space signal and the first color space signal conform to the following formula:
S’＝a*S4+b*S3+c*S2+d*S+e；
wherein, S is a current color saturation signal corresponding to the first color space signal, and S' is a color saturation signal corresponding to the second color space signal; and the a, b, c, d and e are constants, and the a, b, c, d and e are obtained by searching through a preset formula coefficient lookup table according to different color saturation values and different hue intervals.
The invention also discloses a driving system of the display panel, and the driving method of the display panel comprises the following steps:
the receiving module is used for receiving a first color signal under an RGB system and converting the first color signal into a first color space signal under an HSV system;
the preset adjustment coefficient calculation module is used for acquiring a current color saturation signal of the first color space signal and acquiring a preset adjustment coefficient corresponding to the current color saturation signal;
the adjusting module is used for adjusting the current color saturation signals by using preset adjusting coefficients; completing adjustment processing of the color saturation signal to obtain a second color space signal under an HSV system;
and the driving module is used for converting the second color space signal into a second color signal under an RGB system to drive the display panel.
The invention also discloses a display device comprising the driving system of the display panel.
In the invention, based on the RGB color system, the higher the color saturation of the signal is, the more serious the color cast is; acquiring a current color saturation signal, acquiring a preset adjustment coefficient corresponding to the current color saturation signal, and performing color saturation adjustment on the color saturation signal, for example, adjusting the color saturation to be low and adjusting the color saturation to be high, so that the serious color cast problem caused by the signal with higher color saturation can be reduced, and the color cast problem can be improved by properly adjusting the whole frame of color signal; in addition, the scheme is not based on sacrificing the light-permeable opening area, so that the reduction of the light transmittance can be avoided, and the improvement of the production cost of the display panel is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of color shift variation of large viewing angle and front viewing angle of various representative color systems of a liquid crystal display;
FIG. 2 is a first schematic diagram of a division of primary pixels into primary and secondary pixels in an exemplary scheme;
FIG. 3 is a second schematic diagram of the division of primary pixels into primary and secondary pixels in an exemplary scheme;
FIG. 4 is a flowchart illustrating a driving method of a display panel according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the variation of a current color saturation signal and a second color saturation signal of an embodiment of the present invention;
FIG. 6 is a graph of color difference change for a current color saturation signal and a second color saturation signal for an embodiment of the present invention;
FIG. 7 is a schematic diagram of the variation of color difference between a current color saturation signal and a second color saturation signal in accordance with an embodiment of the present invention;
FIG. 8 is a schematic diagram of a driving system of a display panel according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a display device according to an embodiment of the invention.
100, a driving system of the display panel; 200. a display device; 110. a receiving module; 120. a preset adjustment coefficient calculation module; 130. an adjustment module; 140. and a driving module.
Detailed Description
Specific structural and functional details disclosed herein are merely representative and are provided for purposes of describing example embodiments of the present invention. The present invention may, however, be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
The invention is further illustrated by the following figures and examples.
Large-sized lcd panels, especially VA (vertical alignment) lcd panels, have a corresponding large viewing angle brightness that is rapidly saturated with voltage, resulting in a severe deterioration in viewing angle image quality contrast and color shift compared to front view image quality.
Fig. 1 is a schematic diagram of color shift variation of various representative color systems of an lcd in a large viewing angle and a front viewing angle, and referring to fig. 1, it can be clearly seen that the color shift of R, G, B hue in the large viewing angle is worse than that in other color systems.
An exemplary solution is to subdivide each sub-pixel of RGB (Red, Green, Blue) into main/sub-pixels (main/sub), so that the overall large-view luminance is closer to the front view with voltage variation.
Fig. 2 is a schematic diagram of a first comparison without distinguishing primary and secondary pixels, and fig. 3 is a schematic diagram of a second comparison without distinguishing primary and secondary pixels, as can be seen with reference to fig. 2 and 3, wherein the x-coordinate, the y-coordinate, and the z-coordinate respectively represent three directions of a three-dimensional space; the thetaa represents the pretilt angle at which the main pixel has a large voltage, and the thetab represents the pretilt angle at which the sub pixel has a small voltage. In fig. 3, the abscissa is a gray scale signal, and the ordinate is a luminance signal, and at a large viewing angle, the luminance is rapidly saturated with the signal, which causes a color shift problem (fig. 3, a left arc segment) at the large viewing angle, and the problem can be improved to a certain extent by distinguishing the primary and secondary pixels.
Specifically, the original signal is divided into primary and secondary pixels with large voltage and small voltage, the front-view large voltage and the small voltage are added to maintain the change of the original front-view signal along with the brightness, the side-view brightness seen by the large voltage changes along with the gray scale as Part A in fig. 3, and the side-view brightness seen by the small voltage changes along with the gray scale as Part B in fig. 3. Therefore, the brightness of the side-looking composite looks like a left arc line along with the gray scale change and is closer to the relation of the front-looking brightness of a right straight line along with the gray scale change, so that the relation of the visual angle brightness along with the signal change is close to the relation of the front-looking original signal brightness along with the signal change, and the visual angle is improved.
The defect of color shift of a viewing angle is solved by applying different driving voltages to the main pixel and the sub-pixel in space, so that the pixel design usually needs to design a metal wire or a Thin Film Transistor (TFT) element to drive the sub-pixel, the light-permeable opening area is sacrificed, the panel transmittance is influenced, and the backlight cost is directly improved.
Therefore, the invention is based on different technical concepts, and the following schemes are improved and obtained:
fig. 4 is a flowchart of a driving method of a display panel according to the present invention, and as shown in fig. 4, an embodiment of the present invention discloses a driving method of a display panel, including:
s11, receiving a first color signal under an RGB system, and converting the first color signal into a first color space signal under an HSV system;
s12, acquiring a current color saturation signal of the first color space signal, and acquiring a preset adjustment coefficient corresponding to the current color saturation signal;
s13, adjusting the current color saturation signals by using preset adjusting coefficients;
s14, completing the adjustment process of the color Saturation signal to obtain a second color space signal under HSV (Hue, Saturation) system;
and S15, converting the second color space signal into a second color signal under an RGB system to drive the display panel.
The driving system for using the driving method can be arranged at the front end and in a time sequence control chip of the display panel, and parameters such as a preset adjustment coefficient lookup table related to the performance of the display panel corresponding to the driving system are stored in the time sequence control chip.
The color cast degree of each display panel is inconsistent, and the driving method can be related to the performance of the display panel by the arrangement of the invention, so that the color saturation adjustment of the corresponding degree can be more pertinently carried out on the actual color cast condition of the display panel, and a better adjustment effect is achieved.
In the invention, based on the RGB color system, the higher the color saturation of the signal is, the more serious the color cast is; acquiring a current color saturation signal, acquiring a preset adjustment coefficient corresponding to the current color saturation signal, and performing color saturation adjustment on the color saturation signal, for example, adjusting the color saturation to be low and adjusting the color saturation to be high, so that the serious color cast problem caused by the signal with higher color saturation can be reduced, and the color cast problem can be improved by properly adjusting the whole frame of color signal; in addition, the scheme is not based on sacrificing the light-permeable opening area, so that the reduction of the light transmittance can be avoided, and the improvement of the production cost of the display panel is avoided.
In an embodiment, the adjusting process includes a step of performing color saturation value reduction processing on all color saturation signals according to a preset adjustment coefficient.
In the scheme, the step of adjusting the color saturation is to perform color saturation value reduction processing on all color saturation signals, so that the color saturation value of the second color signal in an RGB system can be reduced, the problem of color cast caused by overhigh color saturation value of the corresponding color signal is avoided, and the problem of large-viewing-angle color cast of the display panel, especially the VA-type panel, is improved.
Of course, the step of the adjustment processing may also set two thresholds, that is, a first threshold and a second threshold, and perform adjustment processing for reducing the color saturation value when the color saturation value of the color saturation signal exceeds the first threshold; and when the color saturation value of the color saturation signal is lower than a second threshold value, performing adjustment processing for increasing the color saturation value.
In one embodiment, the color saturation signal is divided into at least a first hue interval, a second hue interval and a third hue interval according to hue difference;
the method comprises the following steps of obtaining a preset adjustment coefficient corresponding to a current color saturation signal:
and corresponding to the same tone, the larger the color saturation value of the current color saturation signal is, the larger the adjustment amplitude of the adjustment processing is.
In the scheme, as the color saturation value of the color saturation signal is higher in the same hue interval, especially under the same hue, the corresponding color cast problem is more serious; therefore, the scheme has larger adjustment amplitude for signals with higher color saturation, and has smaller adjustment amplitude for signals with low color saturation value; the color saturation value of each signal is generally subjected to down-regulation processing, so that the color saturation difference of each signal can be reduced, the color cast problem caused by too high color saturation is avoided, meanwhile, the color cast problem caused by too large color saturation difference is avoided, and the effect of better color cast improvement is achieved.
In addition, the adjustment amplitude mainly refers to the amplitude of the color saturation signal, according to the difference of the calculation formulas, the larger the color saturation value is, the smaller the corresponding preset adjustment coefficient may be, and the larger the corresponding preset adjustment coefficient may be, but the effect of the larger the adjustment amplitude is unchanged; for example, if the preset adjustment coefficient is a coefficient of the entire color saturation signal, for example, S '═ S × H (where S is the current color saturation signal, S' is the adjusted color saturation signal, and the preset adjustment coefficient is H), the larger the adjustment amplitude is, the smaller the value of the preset adjustment coefficient is; if the preset adjustment coefficient is a coefficient of a certain parameter of the color saturation signal, the larger the adjustment amplitude is, the larger the corresponding coefficient may also be, for example, when S ' is 1-min × H/max (where S is the current color saturation signal or S is the current color saturation signal corresponding to the first color space signal, S ' is the adjusted color saturation signal or S ' is the color saturation signal corresponding to the second color space signal, and H is the preset adjustment coefficient), the larger the preset adjustment coefficient is, the larger the corresponding adjustment amplitude is.
Of course, it is also possible to perform the adjustment processing on the color saturation signals with lower color saturation values, so as to make the different color saturation signals more uniform, and also to improve the problem of color shift to some extent.
In one embodiment, the color saturation signal is divided into at least a first hue interval, a second hue interval and a third hue interval according to hue difference;
the method comprises the following steps of obtaining a preset adjustment coefficient corresponding to a current color saturation signal:
and the preset adjustment coefficients corresponding to the current color saturation signals with the same color saturation value are different corresponding to the first color tone interval, the second color tone interval and the third color tone interval.
In the scheme, on the basis of different color saturation signal color cast degree of different color hue intervals, under the condition of the same color saturation value, the color cast of a part of the color hue intervals is serious, the color cast of a part of the color hue intervals is lighter, for the color hue intervals with more obvious color cast problems, the corresponding color saturation signals can be greatly reduced, and for the color hue intervals with less obvious color cast problems, the color cast can be reduced to a smaller extent, so that the color cast problem can be better improved.
In one embodiment, the first, second and third hue ranges are red, green and blue hue ranges, respectively;
the adjustment amplitude of the preset adjustment coefficient corresponding to the blue hue interval on the current color saturation signal is larger than the adjustment amplitude of the preset adjustment coefficient corresponding to the red hue interval on the current color saturation signal; the adjustment amplitude of the preset adjustment coefficient corresponding to the red hue interval to the current color saturation signal is larger than the adjustment amplitude of the preset adjustment coefficient corresponding to the green hue interval to the current color saturation signal.
In the scheme, the degree of color cast problem is different based on color saturation signals of different hue intervals, under the condition of the same color saturation value, the color cast of a part of the hue intervals is serious, and the color cast of a part of the hue intervals is lighter; under an RGB system, the color cast problem of a color saturation signal in a blue hue interval is the most serious, and the color cast problem of the color saturation signal in a green hue interval is the least serious; in the scheme, for example, S' ═ S × H, the preset adjustment coefficient corresponding to the blue tone interval may be smaller than the preset adjustment coefficient corresponding to the red tone interval, and the preset adjustment coefficient corresponding to the red tone interval may be smaller than the preset adjustment coefficient corresponding to the green tone interval, where the smaller the preset adjustment coefficient is, the larger the adjustment amplitude is; correspondingly, taking S' ═ 1-min × H/max as an example, at this time, the preset adjustment coefficient corresponding to the blue hue interval is the largest and the adjustment amplitude is the largest, and the preset adjustment coefficient corresponding to the green hue interval is the smallest and the adjustment amplitude is the smallest; under the same color saturation value, the color saturation signal in the blue color tone interval has the largest reduction amplitude, and the color saturation signal in the green color tone interval has the smallest reduction amplitude, so that the color cast problem caused by the overlarge color saturation value can be reduced, the color saturation of the color saturation signal is more uniform, the color cast problem can be improved to a certain extent, and the good color cast improvement effect can be achieved.
In one embodiment, the color saturation signal is divided into at least a red hue interval, a green hue interval and a blue hue interval according to different hues;
presetting red tone intervals, green tone intervals and blue tone intervals as red adjustment coefficients, green adjustment coefficients and blue adjustment coefficients respectively;
the red adjustment coefficient, the green adjustment coefficient and the blue adjustment coefficient are constants;
the adjustment amplitude of the red adjustment coefficient to the color saturation signal is larger than that of the green adjustment coefficient to the color saturation signal and smaller than that of the blue adjustment coefficient to the color saturation signal.
In the scheme, the color cast problem degrees of the color saturation signals based on different hue intervals are different, wherein the color cast of a part of the hue intervals is serious, and the color cast of a part of the hue intervals is lighter; under an RGB system, the color cast problem of a color saturation signal in a blue hue interval is the most serious, and the color cast problem of the color saturation signal in a green hue interval is the least serious; according to the scheme, the blue preset adjustment coefficient is smaller than the red preset adjustment coefficient, the red preset adjustment coefficient is smaller than the preset adjustment coefficient of the corresponding green tone interval, and the smaller the preset adjustment coefficient is, the larger the adjustment amplitude is; the color saturation signal in the blue hue interval has the largest amplitude of lowering, and the color saturation signal in the green hue interval has the smallest amplitude of lowering, so that the color cast problem caused by overlarge color saturation value can be reduced, the color saturation of the color saturation signal is more uniform, the color cast problem can be improved to a certain extent, and the good color cast improving effect can be achieved.
In one embodiment, the range of Hue values Hue is: 0-360, corresponding to 0-360 degrees, wherein,
the hue range in which the hue value satisfies the following formula is a red hue range: hue is more than or equal to 0 and less than 60, or Hue is more than 300 and less than or equal to 360;
the hue range in which the hue value satisfies the following formula is a green hue range: hue is more than or equal to 60 and less than or equal to 180;
the hue range in which the hue value satisfies the following formula is a blue hue range: hue is more than or equal to 180 and less than or equal to 300.
According to the scheme, the color saturation signal is divided into different hue intervals according to different hues; specifically, the hue represents colors with different hues from 00 to 360 degrees, wherein the hue is defined as red at 0 degree, green at 120 degrees and blue at 240 degrees; setting a part close to 0 degree as a red tone section, setting a part close to 120 degrees as a green tone section, and setting a part close to 240 degrees as a blue tone section; therefore, according to different hues and different characteristics of hue intervals, corresponding preset adjustment coefficients are respectively calculated or searched for color saturation adjustment, adjustment of color saturation values can be performed more pertinently and more reasonably, the problem that adjustment amplitude is too large or too small is avoided as much as possible, the effect of color cast problem can be better improved through targeted adjustment processing, and the problem of color saturation adjustment unbalance is reduced as much as possible.
In an embodiment, the preset adjustment coefficient is calculated according to a preset calculation formula or is obtained by looking up through an adjustment coefficient lookup table.
In the scheme, a corresponding calculation formula or an adjustment coefficient lookup table is obtained in advance through a pre-test or calculation, so that different preset adjustment coefficients can be obtained according to different color saturation signals (color saturation values, hue intervals and the like) when the current color saturation signal is obtained, the color saturation values of the color saturation signals are adjusted to different degrees, and the problem of color cast caused by too high color saturation values is reduced.
The adjustment coefficient lookup table may be a lookup table directly recording all preset adjustment coefficients based on different hue and different saturation values.
In one embodiment, the second color space signal and the first color space signal conform to the following equation:
S’＝a*S4+b*S3+c*S2+d*S+e；
wherein, S is a current color saturation signal corresponding to the first color space signal, and S' is a color saturation signal corresponding to the second color space signal; a, b, c, d and e are constants, and a, b, c, d and e are obtained by searching through a preset formula coefficient lookup table according to different color saturation values and different hue intervals.
In the scheme, the preset adjustment coefficient can be obtained by calculation according to a preset calculation formula, although the calculation formula is different, the calculation formula can generally satisfy a fourth-order polynomial, wherein the constant coefficients a, b, c, d and e are obtained by searching through a preset lookup table according to the difference between the color saturation value and the hue interval; of course, other calculation formulas are also applicable, for example, when the color saturation value S satisfies a certain condition, the preset adjustment coefficient is equal to the root number S; when the color saturation value S satisfies another condition, it is also possible to preset a formula in which the adjustment coefficient is equal to the cubic root S.
Fig. 5 is a schematic diagram of changes in a current color saturation signal and a second color saturation signal according to an embodiment of the present invention, fig. 6 is a graph illustrating changes in color difference between the current color saturation signal and the second color saturation signal according to an embodiment of the present invention, and fig. 7 is a schematic diagram illustrating changes in color difference between the current color saturation signal and the second color saturation signal according to an embodiment of the present invention.
The color difference change map of fig. 6 may be in the case of a front view angle. Of course, a side view angle is also possible. The dashed line in fig. 7 is the corresponding color difference change of the current color saturation signal in various color systems, and the solid line is the corresponding color difference change of the second color saturation signal in various color systems.
Specifically, if the display is driven with 8-bit color resolution, the gray scale of the RGB input signals can be decomposed into 0,1,2 … 255 gray scale driving signals. The invention converts RGB three primary colors input signals into HSV color space signals, and adjusts the color saturation according to different hue and saturation values in the HSV color space to achieve the effect of improving the color cast.
Referring to fig. 1, it can be clearly found that the color shift of R, G, B hue in the large viewing angle of the color system is more serious than that of other color systems due to the variation of the large viewing angle and the front viewing angle of various representative color systems of the lcd, so that the problem of R, G, B hue color shift can be solved to greatly improve the overall color shift improvement of the large viewing angle.
The calculation method for converting the color signals or RGB three-primary-color signals into HSV signals in the RGB system is described as follows:
the input signal of RGB three primary colors is 8bit gray scale digital signal of 0,1, … 255, and the brightness normalization signal (taking 255 gray scale as maximum brightness) corresponding to 255 input signal of each gray scale signal is r, g, b respectively.
Where R ═ R/255 ^ γ R, G ^ γ G, B ^ B (B/255) ^ γ B, where γ R, γ G, γ B are so-called gamma signals, the digital gray-scale signals are converted into exponential parameters of the luminance signals. H is a hue signal, and r, g, b normalized luminance signals are converted into hue H and saturation signals s. Wherein, H is represented by color, and represents the color presentation of different hues from 0 degree to 360 degrees, wherein 0 degree is defined as red, 120 degrees is defined as green, and 240 degrees is defined as blue.
r, g, b normalize the conversion relationship between the luminance signal and the hue h and saturation signal s, and satisfy the following formula:
in summary, it can be seen that when the hue approaches R, G, B pure hue, the color shift observed at viewing angles is more conspicuous, while when the hue approaches R, G, B pure hue, the color shift phenomenon is more conspicuous as the color saturation s is larger. The color saturation s can be reduced R, G, B when the pure hue is changed, namely, the closer to the pure hue, the larger the adjustment range of the color saturation is, so that the color enjoyed at a large visual angle is better than the color observed in a front view or the color cast problem is eliminated.
In addition, after the color saturation adjustment is completed, a detection step may be added, for example, to convert the color saturation signal into a CIE Lu ' v ' color space signal (CIE, Commission international de L ' Eclairage), where L is a luminance coordinate and u ' and v ' are chrominance coordinates. In order to improve the color shift problem, the color saturation adjustment performs a process of reducing the color saturation value on the current color saturation signal, but if the color saturation loss is reduced as much as possible, the change of the pure color, i.e. the change from the current color saturation signal S to the second color saturation signal S', i.e. the purity change or the color difference Δ uv, should satisfy:
Δ uv √ (u _1-u _2) ^2+ (v _1-v _2) ^2) ≦ 0.02. Where u _1 and v _1 are the chromaticity coordinates of the current color saturation signal and u _2 and v _2 are the chromaticity coordinates of the second color saturation signal, i.e. the color saturation signal after color saturation adjustment.
Fig. 8 is a schematic diagram of a driving system of a display panel according to the present invention, and referring to fig. 8, it can be known from fig. 1 to 7 that: the invention also discloses a driving system 100 of a display panel, which uses the driving method of the display panel according to the invention, and comprises the following steps:
the receiving module 110, i.e., a receiving circuit, receives the first color signal in the RGB system, and converts the first color signal into a first color space signal in the HSV system;
the preset adjustment coefficient calculation module 120, that is, the preset adjustment coefficient calculation circuit, acquires a current color saturation signal of the first color space signal, and acquires a preset adjustment coefficient corresponding to the current color saturation signal;
the adjusting module 130, i.e. the adjusting circuit, respectively adjusts and processes the current color saturation signal by using a preset adjusting coefficient; completing adjustment processing of the color saturation signal to obtain a second color space signal under an HSV system;
the driving module 140, i.e., the driving circuit, converts the second color space signal into a second color signal under the RGB system to drive the display panel.
Fig. 9 is a schematic view of a display device according to the present invention, and referring to fig. 9, it can be known from fig. 1 to 8 that: the invention also discloses a display device 200 comprising a driving system 100 of a display panel according to the invention.
It should be noted that, the limitations of the steps involved in the present disclosure are not considered to limit the order of the steps without affecting the implementation of the specific embodiments, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all should be considered to belong to the protection scope of the present disclosure.
The technical solution of the present invention can be widely applied to various display panels, such as TN type display panels (called Twisted Nematic panels), IPS type display panels (In-Plane Switching), VA type display panels (Vertical Alignment technology), MVA type display panels (Multi-domain Vertical Alignment technology), and of course, other types of display panels, such as organic light-emitting display panels (OLED display panels for short), which can be applied to the above solutions.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (9)
1. A method of driving a display panel, comprising the steps of:
receiving a first color signal under an RGB system, and converting the first color signal into a first color space signal under an HSV system;
acquiring a current color saturation signal of the first color space signal, and acquiring a preset adjustment coefficient corresponding to the current color saturation signal;
respectively adjusting the current color saturation signals by using preset adjustment coefficients;
completing adjustment processing of the color saturation signal to obtain a second color space signal under an HSV system;
converting the second color space signal into a second color signal under an RGB system to drive the display panel;
a driving system for using the driving method is arranged in a time sequence control chip of the display panel, and a preset adjustment coefficient lookup table related to the performance of the display panel corresponding to the driving system is stored in the time sequence control chip;
the preset adjustment coefficient is obtained by calculation according to a preset calculation formula or by searching through an adjustment coefficient lookup table; the second color space signal and the first color space signal conform to the following formula:
S’＝a*S4+b*S3+c*S2+d*S+e；
wherein, S is a current color saturation signal corresponding to the first color space signal, and S' is a color saturation signal corresponding to the second color space signal; and the a, b, c, d and e are constants, and the a, b, c, d and e are obtained by searching through a preset formula coefficient lookup table according to different color saturation values and different hue intervals.
2. The method for driving a display panel according to claim 1, wherein the adjustment processing is performed by performing color saturation value reduction processing on all color saturation signals according to a preset adjustment coefficient.
3. The method of claim 1, wherein the color saturation signal is divided into at least a first hue range, a second hue range and a third hue range according to hue difference;
in the step of obtaining the preset adjustment coefficient corresponding to the current color saturation signal:
and corresponding to the same tone, the larger the color saturation value of the current color saturation signal is, the larger the adjustment amplitude of the adjustment processing is.
4. The method of claim 2, wherein the color saturation signal is divided into at least a first hue range, a second hue range and a third hue range according to hue difference;
in the step of obtaining the preset adjustment coefficient corresponding to the current color saturation signal:
and the preset adjustment coefficients corresponding to the current color saturation signals with the same color saturation value are different corresponding to the first color tone interval, the second color tone interval and the third color tone interval.
5. The method according to claim 4, wherein the first tone region, the second tone region, and the third tone region are a red tone region, a green tone region, and a blue tone region, respectively;
the adjustment amplitude of the preset adjustment coefficient corresponding to the blue hue interval on the current color saturation signal is larger than the adjustment amplitude of the preset adjustment coefficient corresponding to the red hue interval on the current color saturation signal; the adjustment amplitude of the preset adjustment coefficient corresponding to the red hue interval to the current color saturation signal is larger than the adjustment amplitude of the preset adjustment coefficient corresponding to the green hue interval to the current color saturation signal.
6. The method of claim 2, wherein the color saturation signal is split into at least a red hue interval, a green hue interval, and a blue hue interval according to hue difference;
the red tone interval, the green tone interval and the blue tone interval are respectively and correspondingly preset and adjusted to be a red adjusting coefficient, a green adjusting coefficient and a blue adjusting coefficient;
the red adjustment coefficient, the green adjustment coefficient and the blue adjustment coefficient are constants;
the adjustment amplitude of the red adjustment coefficient to the color saturation signal is larger than the adjustment amplitude of the green adjustment coefficient to the color saturation signal and smaller than the adjustment amplitude of the blue adjustment coefficient to the color saturation signal.
7. The method for driving a display panel according to claim 3, 4 or 6,
the hue interval satisfying the following formula is a red hue interval: hue is more than or equal to 0 and less than 60, or Hue is more than 300 and less than or equal to 360;
the hue interval satisfying the following formula is a green hue interval: hue is more than or equal to 60 and less than or equal to 180;
the hue range satisfying the following formula is a blue hue range: hue is more than or equal to 180 and less than or equal to 300;
wherein Hue is a Hue value, and the range of the Hue value is as follows: 0-360 degrees, corresponding to 0-360 degrees.
8. A driving system of a display panel using a driving method of a display panel according to any one of claims 1 to 7, comprising:
the receiving module is used for receiving a first color signal under an RGB system and converting the first color signal into a first color space signal under an HSV system;
the preset adjustment coefficient calculation module is used for acquiring a current color saturation signal of the first color space signal and acquiring a preset adjustment coefficient corresponding to the current color saturation signal;
the adjusting module is used for adjusting the current color saturation signals by using preset adjusting coefficients; completing adjustment processing of the color saturation signal to obtain a second color space signal under an HSV system;
and the driving module is used for converting the second color space signal into a second color signal under an RGB system to drive the display panel.
9. A display device characterized by comprising a driving system of a display panel according to claim 8.
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