CN109559693B - 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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- 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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
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, and converting the first color signal into a first color space signal; acquiring a current color saturation signal S of a first color space signal and a corresponding first preset adjustment coefficient; adjusting the current color saturation signal S by using a first preset adjusting coefficient to obtain a second color saturation signal S'; calculating to obtain a third color saturation signal S 'according to the current color saturation signal S and the second color saturation signal S'; completing the adjustment of the color saturation value twice to obtain a second color space signal under an HSV system according to the conversion of a third color saturation signal S'; and converting the second color space signal into a second color signal under an RGB system according to the second color space signal to drive the display panel. The invention carries out secondary adjustment on the color saturation signal so as to improve the color cast more pertinently and accurately.
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 negative type VA (Vertical Alignment) liquid crystal or IPS (In-Plane Switching) liquid crystal technology, and compared with the IPS liquid crystal technology, the VA liquid crystal technology has the advantages of higher production efficiency and low manufacturing cost, but compared with the IPS liquid crystal technology, the optical property of the VA liquid crystal technology has the defect of obvious optical property; that is, in some large-sized display panels, especially VA-mode liquid crystal driving, the brightness at a large viewing angle is rapidly saturated with voltage, which causes the quality of the viewing angle image quality contrast and color cast to be seriously deteriorated compared with the front-view image quality, i.e. there is a large viewing angle color cast problem.
Disclosure of Invention
The invention aims to provide a driving method, a driving system and a display device of a display panel, which can improve the problem of color cast.
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 S of the first color space signal, and acquiring a first preset adjusting coefficient corresponding to the current color saturation signal S;
adjusting the current color saturation signal S by using a first preset adjusting coefficient to obtain a second color saturation signal S';
calculating to obtain a third color saturation signal S 'according to the current color saturation signal S and the second color saturation signal S';
completing the adjustment of the color saturation value twice to obtain a second color space signal under an HSV system according to the conversion of a third color saturation signal S';
and converting the second color space signal into a second color signal under an RGB system according to the second color space signal to drive the display panel.
Optionally, the step of calculating a third color saturation signal S ″ according to the current color saturation signal S and the second color saturation signal S' includes:
judging whether the current color saturation signal reaches a preset threshold value of color saturation, and if so, acquiring a second preset adjustment coefficient corresponding to the current color saturation signal;
and calculating to obtain a third color saturation signal S 'according to the current color saturation signal S and the second color saturation signal S' based on a second preset adjusting coefficient.
Optionally, the preset threshold of color saturation is 0.5;
when the color saturation value of the first color saturation signal S is larger than 0.5, determining that the preset threshold value of the color saturation is reached;
and when the color saturation value of the first color saturation signal S is less than or equal to 0.5, determining that the color saturation value does not reach the preset threshold value.
Optionally, the current color saturation signal S is split into at least an adjusted hue interval and a non-adjusted hue interval according to different hues;
the step of calculating a third color saturation signal S ″ according to the current color saturation signal S and the second color saturation signal S' includes:
when the Hue value of the S is positioned in the Hue adjusting interval, the second color saturation signal S 'obtains a third color saturation signal S' according to a second preset adjusting coefficient;
when the Hue value of S is in the non-adjusted Hue section, S ═ S.
Optionally, the third color saturation signal S ″ conforms to the following formula:
S”＝S-(S-S’)*H2；
the second preset adjustment coefficient H2 satisfies the following formula:
H2＝2*ABS(sin((Hue/360*3-1/2)*π)-1)。
optionally, the second preset adjustment coefficient H2 further satisfies the following formula: h2 ═ H2 × factor, and when the Hue value Hue of the color saturation signal is in an adjusted Hue interval, factor is equal to 1, and when the Hue value Hue of the color saturation signal is in a non-adjusted Hue interval, factor is equal to 0.
Optionally, when the Hue value of the current color saturation signal S satisfies the following Hue interval, dividing into an adjustment Hue interval: hue is more than or equal to 0 and less than 40, or Hue is more than 320 and less than or equal to 360, or Hue is more than 80 and less than 160, or Hue is more than 200 and less than 280;
when the Hue value of the current color saturation signal S satisfies the following Hue interval, dividing the current color saturation signal S into non-adjusted Hue intervals: hue is more than or equal to 40 and less than or equal to 80, Hue is more than or equal to 160 and less than or equal to 200, or Hue is more than or equal to 280 and less than or equal to 320.
Optionally, the first preset adjustment coefficient is obtained by calculation according to a preset calculation formula or by searching through an adjustment coefficient lookup table.
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 adjustment coefficient acquisition module is used for acquiring a current color saturation signal S of the first color space signal and acquiring a first preset adjustment coefficient corresponding to the current color saturation signal S;
the first adjusting module is used for adjusting the current color saturation signal S by using a first preset adjusting coefficient to obtain a second color saturation signal S';
a second adjusting module, configured to calculate a third color saturation signal S ″ according to the current color saturation signal S and the second color saturation signal S'; completing the adjustment of the color saturation value twice to obtain a second color space signal under an HSV system according to the conversion of a third color saturation signal S';
and the driving module is used for converting the second color space signal into a second color signal under an RGB system so as to drive the display panel.
The invention also provides a display device comprising the driving system of the display panel.
In the invention, the corresponding color cast problem of color signals in an RGB system is obvious under the condition of higher color saturation; the method firstly uses the first preset adjustment coefficient to carry out primary adjustment on the current color saturation signal, and then carries out secondary adjustment, so that in the primary adjustment, secondary adjustment can be carried out to enhance the adjustment range due to the fact that some color cast problems are serious but the adjustment range is insufficient, and a better adjustment effect is achieved; for some color cast problems, the color saturation signal which does not need to be adjusted actually can be recovered to the original color saturation value or slightly secondarily adjusted; therefore, the color saturation signals with serious color cast problem and less serious color cast problem can be better adjusted to be closer to the requirement by twice adjustment, so that a better adjustment effect is achieved, and the display effect of the display panel is favorably improved; 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 diagram illustrating a correlation function of a second preset adjustment factor H2 according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating another correlation function of the second predetermined adjustment factor H2 according to the embodiment of the present invention;
FIG. 7 is a schematic diagram of a variation of a current color saturation signal and a second color saturation signal for one embodiment of the present invention;
FIG. 8 is a graph illustrating a change in color difference between a current color saturation signal and a second color saturation signal in accordance with one embodiment of the present invention;
FIG. 9 is a schematic diagram of a color difference change of a current color saturation signal and a second color saturation signal for one embodiment of the present invention;
FIG. 10 is a schematic diagram of a driving system of a display panel according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a display device according to an embodiment of the present invention. 100, a driving system of the display panel; 200. a display device; 110. a receiving module; 120. an adjustment coefficient acquisition module; 130. a first adjusting module; 140. a second adjustment module; 150. 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 the first color signal under the RGB system, and converting the first color signal into a first color space signal under the HSV (Hue, Saturation) system;
s12, acquiring a current color saturation signal S of the first color space signal, and acquiring a first preset adjusting coefficient corresponding to the current color saturation signal S;
s13, adjusting the current color saturation signal S by using a first preset adjusting coefficient to obtain a second color saturation signal S';
s14, calculating to obtain a third color saturation signal S 'according to the current color saturation signal S and the second color saturation signal S';
s15, completing the adjustment of the color Saturation Value twice to obtain a second color space signal under an HSV (Hue, Saturation) system according to the conversion of the third color Saturation signal S';
and S16, 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.
In the invention, the corresponding color cast problem of color signals in an RGB system is obvious under the condition of higher color saturation; the method firstly uses the first preset adjustment coefficient to carry out primary adjustment on the current color saturation signal, and then carries out secondary adjustment, so that in the primary adjustment, secondary adjustment can be carried out to enhance the adjustment range due to the fact that some color cast problems are serious but the adjustment range is insufficient, and a better adjustment effect is achieved; for some color cast problems, the color saturation signal which does not need to be adjusted actually can be recovered to the original color saturation value or slightly secondarily adjusted; therefore, the color saturation signals with serious color cast problem and less serious color cast problem can be better adjusted to be closer to the requirement by twice adjustment, so that a better adjustment effect is achieved, and the display effect of the display panel is favorably improved; 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 one embodiment, the step S14 of calculating the third color saturation signal S ″ according to the current color saturation signal S and the second color saturation signal S' includes:
judging whether the current color saturation signal reaches a preset threshold value of color saturation, and if so, acquiring a second preset adjustment coefficient corresponding to the current color saturation signal;
and calculating to obtain a third color saturation signal S 'according to the current color saturation signal S and the second color saturation signal S' based on a second preset adjusting coefficient.
In the scheme, a current color saturation signal is converted into a second color saturation signal, then whether the current color saturation signal meets a preset color saturation threshold value is judged, if yes, the second color saturation signal is reserved, the second color saturation signal is converted into a third color saturation signal, and the color saturation signal with serious color cast problem can be subjected to targeted secondary adjustment (for example, more color cast signals with serious color cast problem and less color cast signals with slight color cast problem); for the color saturation signal which does not meet the preset threshold value, the second color saturation signal can be cancelled, and the original current color saturation signal is used as a third color saturation signal; or the second color saturation signal is not adjusted twice any more, and the second color saturation signal is directly output as the third color saturation signal.
In an embodiment, in the step of determining whether the current color saturation signal reaches the preset threshold value of color saturation, the preset threshold value of color saturation is 0.5;
when the color saturation value of the first color saturation signal S is larger than 0.5, determining that the preset threshold value of the color saturation is reached;
and when the color saturation value of the first color saturation signal S is less than or equal to 0.5, determining that the color saturation value does not reach the preset threshold value.
Wherein the color saturation threshold may be 0.5 to 1, excluding 0.5 and 1, that is, when the current color saturation signal is 1, the second color saturation signal may not be adjusted; of course, adjustment is also possible, and the color saturation threshold may be adjusted accordingly according to specific requirements.
In the scheme, the principle that the larger the color saturation value is, the more serious the color cast problem is considered in general; dividing the color saturation signal into one part of which the color saturation value meets a preset threshold value and the other part of which the color saturation value does not meet the preset threshold value; specifically, the preset threshold value is set to 0.5, so that a color saturation signal with a serious color cast problem can be selected for adjustment, and a color saturation signal with a light color cast problem or even without the color cast problem is not adjusted, so that the color cast problem is improved, the reduction of the color saturation value is avoided as much as possible, the balance between the color cast and the color saturation is achieved, and a better display effect is achieved.
In one embodiment, the current color saturation signal S is split into at least an adjusted hue interval and a non-adjusted hue interval according to hue difference;
the step S14 of calculating a third color saturation signal S ″ according to the current color saturation signal S and the second color saturation signal S' includes:
when the Hue value of the S is positioned in the Hue adjusting interval, the second color saturation signal S 'obtains a third color saturation signal S' according to a second preset adjusting coefficient;
when the Hue value of S is in the non-adjusted Hue section, S ═ S.
In the scheme, after the color saturation signal is subjected to primary color saturation adjustment by using a first preset adjustment coefficient to improve the color cast problem, the current color saturation signal S and a second color saturation signal are required to be obtained; specifically, whether the color saturation signal after the first color saturation adjustment is completed is located in an adjustment hue interval or a non-adjustment hue interval is judged, and if the color saturation signal is located in the adjustment hue interval, a third color saturation signal S 'is obtained according to a second preset adjustment coefficient and the second color saturation signal S'; otherwise, the third color saturation signal S ═ S; therefore, the color saturation signal positioned in the tone adjusting interval can be subjected to secondary adjustment by using a second preset adjustment coefficient in a targeted manner, so that the effect of better improving the color cast problem is achieved; and if the color saturation signal is located in the non-adjustment coefficient interval, the third color saturation signal S ═ S can be selected, that is, adjustment is not performed, so that the change of the color saturation value of the color saturation signal can be avoided as much as possible, the damage of the operation for improving the color cast problem to the color saturation of the whole image quality is reduced, the balance of the color cast and the color saturation is achieved, and a better display effect is achieved.
Fig. 5 is a schematic diagram of a correlation function of the second preset adjustment coefficient H2 according to the embodiment of the present invention, fig. 6 is a schematic diagram of another correlation function of the second preset adjustment coefficient H2 according to the embodiment of the present invention, referring to fig. 5 and fig. 6, and referring to fig. 4, in an embodiment, the third color saturation signal S ″ satisfies the following formula:
S”＝S-(S-S’)*H2；
the second preset adjustment coefficient H2 satisfies the following equation:
H2＝2*ABS(sin((Hue/360*3-1/2)*π)-1)。
the second preset adjustment coefficient may further satisfy the following formula:
H2＝ABS(sin((Hue/360*3-1/2)*π))。
in the scheme, under an RGB system, a 0-degree red pure color tone, a 120-degree green pure color tone and a 240-degree blue pure color tone are defined, and the closer to the pure color tone, the more serious the color cast problem is (under the same color saturation value); based on the second preset adjustment coefficient H2, the closer the color saturation signal of the pure color tone is, the larger amplitude of the secondary adjustment is obtained, and the farther the color saturation signal of the pure color tone is, the smaller amplitude of the secondary adjustment is obtained; therefore, the saturation signal close to the pure color tone can achieve the effect of better improving the color cast problem, and the saturation signal far away from the pure color tone can achieve the effect of reducing the damage of improving the color cast to the whole color saturation, so as to achieve the balance of the color cast and the color saturation and be beneficial to improving the display effect of the display panel.
In one embodiment, the second predetermined adjustment factor H2 further satisfies the following formula: h2 is H2 factor, and the factor is equal to 1 when the Hue value Hue of the color saturation signal is in the adjusted Hue interval, and is equal to 0 when the Hue value Hue of the color saturation signal is in the non-adjusted Hue interval.
In the scheme, for the second preset adjustment coefficient, when the hue value of the color saturation signal is located in the adjustment hue interval, the closer to the pure color hue, the greater the secondary adjustment of the color saturation is performed; and if the saturation signal is positioned in the non-adjustment hue interval, the secondary adjustment eliminates the adjustment of the first preset adjustment coefficient on the current color saturation signal, namely, the third color saturation signal S is equal to S, so that the saturation signal close to the pure hue can achieve the effect of better improving the color cast problem, and the saturation signal far away from the pure hue can achieve the effect of reducing the damage of the improvement on the whole color saturation, so as to achieve the balance of the color cast and the color saturation, and be beneficial to improving the display effect of the display panel.
In one embodiment, when the Hue value of the current color saturation signal S satisfies the following Hue interval, the adjusted Hue interval is divided: hue is more than or equal to 0 and less than 40, or Hue is more than 320 and less than or equal to 360, or Hue is more than 80 and less than 160, or Hue is more than 200 and less than 280;
when the Hue value of the current color saturation signal S satisfies the Hue interval as follows, dividing the non-adjusted Hue interval: hue is more than or equal to 40 and less than or equal to 80, Hue is more than or equal to 160 and less than or equal to 200, or Hue is more than or equal to 280 and less than or equal to 320.
In the scheme, 0 degree, 120 degree and 240 degree are defined as the centers of the tone adjusting intervals under an RGB system, and the color saturation values of the tone close to 0 degree, 120 degree and 240 degree are divided into the tone adjusting intervals; dividing the color saturation values far away from 0 degree, 120 degrees and 240 degrees into non-adjustment hue intervals; the color saturation signals with serious color cast problems can be selected for adjustment, and the color saturation signals with light color cast problems or even without color cast problems are not adjusted, so that the color cast problems are improved, the reduction of the color saturation value is avoided as much as possible, the balance of the color cast and the color saturation is achieved, and the better display effect is achieved.
In an embodiment, the first predetermined adjustment coefficient is calculated according to a predetermined calculation formula or is obtained by looking up 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 color cast problem caused by too high color saturation values is reduced.
The adjustment coefficient lookup table may be a lookup table directly recording preset adjustment coefficients, or a lookup table recording coefficients of a preset calculation formula.
Wherein the second color space signal and the first color space signal may conform to the following formula:
S’＝a*S4+b*S3+c*S2+d*S+e；
wherein S is a current color saturation signal, and S' is a second color saturation 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 lookup table according to different color saturation values and different hue intervals.
In addition, the color saturation signal can be at least divided into a first color tone interval, a second color tone interval and a third color tone interval according to different color tones;
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.
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 high color saturation, and has smaller adjustment amplitude for signals with low color saturation; 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. 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 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 second color saturation signal, and H is the preset adjustment coefficient), 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, S' is the second color saturation signal, and H is the preset adjustment coefficient), the larger the preset adjustment coefficient is, the larger the corresponding adjustment amplitude is.
In addition, the first hue interval includes a red hue interval, the second hue interval includes a green hue interval, and the third hue interval includes a blue hue interval;
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 an RGB system, the color cast problem of a color saturation signal of a blue hue interval is the most serious, and the color cast problem of the color saturation signal of a green hue interval is the least serious; in the scheme, for example, S' ═ S × H is taken as an example, the preset adjustment coefficient corresponding to the blue tone interval is smaller than the preset adjustment coefficient corresponding to the red tone interval, the preset adjustment coefficient corresponding to the red tone interval is smaller than the preset adjustment coefficient corresponding to the green tone interval, and at this time, 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.
Fig. 7 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. 8 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. 9 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. 8 may be in the case of a front view angle. Of course, a side view angle is also possible. The dashed line in fig. 9 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 the hue signal, and r, g, b normalized luminance signals are converted into hue H and saturation s signals. 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. 10 is a schematic diagram of a driving system of a display panel according to the present invention, and referring to fig. 10, it can be known from fig. 1 to fig. 9 that: the present invention also discloses a driving system 100 of a display panel, comprising:
the receiving module 110, i.e., a receiving circuit, is configured to receive the first color signal in the RGB system, and convert the first color signal into a first color space signal in the HSV system;
an adjustment coefficient obtaining module 120, that is, an adjustment coefficient obtaining module, configured to obtain a current color saturation signal S of the first color space signal, and obtain a first preset adjustment coefficient corresponding to the current color saturation signal S;
the first adjusting module 130, i.e., a first adjusting circuit, is configured to adjust the current color saturation signal S by using a first preset adjusting coefficient to obtain a second color saturation signal S';
the second adjusting module 140, i.e., a second adjusting circuit, is configured to calculate a third color saturation signal S ″ according to the current color saturation signal S and the second color saturation signal S'; completing the adjustment of the color saturation value twice to obtain a second color space signal under an HSV system according to the conversion of a third color saturation signal S';
the driving module 150, i.e. the driving circuit, is configured to convert the second color space signal into a second color signal under the RGB system to drive the display panel.
Fig. 11 is a schematic view of a display device according to the present invention, and referring to fig. 11, it can be seen from fig. 1 to 10 that: the invention also discloses a display device 200 comprising a driving system 100 of the 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 (8)
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 (Hue, Saturation) system;
acquiring a current color saturation signal S of the first color space signal, and acquiring a first preset adjusting coefficient corresponding to the current color saturation signal S;
adjusting the current color saturation signal S by using a first preset adjusting coefficient to obtain a second color saturation signal S';
calculating to obtain a third color saturation signal S 'according to the current color saturation signal S and the second color saturation signal S';
completing the adjustment of the color saturation value twice to obtain a second color space signal under an HSV system according to the conversion of a third color saturation signal S';
converting the second color space signal into a second color signal under an RGB system according to the second color space signal to drive the display panel;
wherein the step of calculating the third color saturation signal S ″ according to the current color saturation signal S and the second color saturation signal S' comprises:
judging whether the current color saturation signal reaches a preset threshold value of color saturation, and if so, acquiring a second preset adjustment coefficient corresponding to the current color saturation signal;
calculating to obtain a third color saturation signal S 'according to the current color saturation signal S and the second color saturation signal S' based on a second preset adjustment coefficient;
the third color saturation signal S "conforms to the following formula:
S”＝S-(S-S’)*H2；
the second preset adjustment coefficient H2 satisfies the following formula:
H2＝2*ABS(sin((Hue/360*3-1/2)*π)-1)。
2. the method for driving a display panel according to claim 1, wherein the preset threshold value of color saturation is 0.5;
when the color saturation value of the first color saturation signal S is larger than 0.5, determining that the preset threshold value of the color saturation is reached;
and when the color saturation value of the first color saturation signal S is less than or equal to 0.5, determining that the color saturation value does not reach the preset threshold value.
3. The method for driving a display panel according to claim 1, wherein the current color saturation signal S is split into at least an adjusted hue interval and a non-adjusted hue interval according to hue difference;
the step of calculating a third color saturation signal S ″ according to the current color saturation signal S and the second color saturation signal S' includes:
when the Hue value of the S is positioned in the Hue adjusting interval, the second color saturation signal S 'obtains a third color saturation signal S' according to a second preset adjusting coefficient;
when the Hue value of S is in the non-adjusted Hue section, S ═ S.
4. The method as claimed in claim 3, wherein the second preset adjustment factor H2 further satisfies the following formula: h2 ═ H2 × factor, and when the Hue value Hue of the color saturation signal is in an adjusted Hue interval, factor is equal to 1, and when the Hue value Hue of the color saturation signal is in a non-adjusted Hue interval, factor is equal to 0.
5. A driving method of a display panel according to claim 3, wherein when the Hue value of the current color saturation signal S satisfies the Hue interval of: hue is more than or equal to 0 and less than 40, or Hue is more than 320 and less than or equal to 360, or Hue is more than 80 and less than 160, or Hue is more than 200 and less than 280;
when the Hue value of the current color saturation signal S satisfies the following Hue interval, dividing the current color saturation signal S into non-adjusted Hue intervals: hue is more than or equal to 40 and less than or equal to 80, Hue is more than or equal to 160 and less than or equal to 200, or Hue is more than or equal to 280 and less than or equal to 320.
6. The method as claimed in claim 1, wherein the first predetermined adjustment factor is calculated according to a predetermined calculation formula or is obtained by looking up an adjustment factor look-up table.
7. A driving system of a display panel using the driving method of the display panel according to any one of claims 1 to 6, 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 adjustment coefficient acquisition module is used for acquiring a current color saturation signal S of the first color space signal and acquiring a first preset adjustment coefficient corresponding to the current color saturation signal S;
the first adjusting module is used for adjusting the current color saturation signal S by using a first preset adjusting coefficient to obtain a second color saturation signal S';
a second adjusting module, configured to calculate a third color saturation signal S ″ according to the current color saturation signal S and the second color saturation signal S'; completing the adjustment of the color saturation value twice to obtain a second color space signal under an HSV system according to the conversion of a third color saturation signal S';
and the driving module is used for converting the second color space signal into a second color signal under an RGB system so as to drive the display panel.
8. A display device characterized by comprising a driving system of the display panel according to claim 7.
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