CN109461417B - 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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Abstract
The invention discloses a driving method, a driving system and a display device of a display panel, comprising the following steps: acquiring first color signals Rn _ i, j, Gn _ i, j and Bn _ i, j, and converting each group of RGB three-primary-color sub-pixel gray scale signals into three-primary-color normalized brightness signals r, g and b; completing conversion to obtain first normalized brightness signals rn _ i, j, gn _ i, j and bn _ i, j; calculating a current color saturation signal S as 1-mini, j/maxi, j, and acquiring a first preset adjustment coefficient H corresponding to the current color saturation signal S; keeping maxi, j unchanged, and adjusting mini, j by using a first preset adjustment coefficient H to obtain a second color saturation signal S' ═ 1-mini, j × H/maxi, j; and converting the second color saturation signal S' to obtain a second color signal under an RGB system so as to drive the display panel.
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;
acquiring first color signals Rn _ i, j, Gn _ i, j and Bn _ i, j, and converting each group of RGB three-primary-color sub-pixel gray scale signals into three-primary-color normalized brightness signals r, g and b; completing conversion to obtain first normalized brightness signals rn _ i, j, gn _ i, j and bn _ i, j;
calculating a current color saturation signal S as 1-mini, j/maxi, j according to the first normalized brightness signal, and acquiring a first preset adjustment coefficient H corresponding to the current color saturation signal S;
keeping maxi, j unchanged, and adjusting mini, j by using a first preset adjustment coefficient H to obtain a second color saturation signal S' ═ 1-mini, j × H/maxi, j;
converting the second color saturation signal S' to obtain a second color signal under an RGB system so as to drive the display panel;
where, mini, j is min (rn _ i, j, gn _ i, j, bn _ i, j), where maxi, j is max (rn _ i, j, gn _ i, j, bn _ i, j).
The invention also provides 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;
the conversion module is used for acquiring first color signals Rn _ i, j, Gn _ i, j and Bn _ i, j and converting each group of RGB three primary color sub-pixel gray scale signals into three primary color normalized brightness signals r, g and b; completing conversion to obtain first normalized brightness signals rn _ i, j, gn _ i, j and bn _ i, j;
the adjustment coefficient calculation module is used for calculating a current color saturation signal S as 1-mini, j/maxi, j according to the first normalized luminance signal and acquiring a first preset adjustment coefficient H corresponding to the current color saturation signal S;
the adjusting module is used for keeping maxi, j unchanged, and adjusting mini, j by using a first preset adjusting coefficient H to obtain a second color saturation signal S' ═ 1-mini, j × H/maxi, j;
the driving module is used for converting the second color saturation signal S' to obtain a second color signal under an RGB system so as to drive the display panel;
where, mini, j is min (rn _ i, j, gn _ i, j, bn _ i, j), where maxi, j is max (rn _ i, j, gn _ i, j, bn _ i, j).
The invention also discloses a display device comprising the driving system of the display panel.
In the invention, under an RGB system, the higher the color saturation of a signal is, the more serious the color cast is; in order to improve the color cast problem, the color saturation value of a color saturation signal with a higher color saturation value needs to be adjusted to be lower; specifically, the color saturation signal S ═ 1-mini, j/maxi, j, where mini, j and maxi, j are variables, and the color saturation value can be adjusted by adjusting both of them, in this scheme, maxi, j is mainly kept unchanged, and the purpose of lowering the color saturation value is achieved by increasing mini, j; after the adjustment, the color saturation signal, especially the color saturation signal with too high color saturation value, is adjusted to be low to improve the problem of color cast, and 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 can be avoided; in addition, the mini and j can be increased, and meanwhile, the brightness of the mini and j can be improved, so that the problem of color cast is solved, the overall brightness of the display panel is improved, and a better display effect is achieved.
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 of a driving method of a display panel according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating the correlation function of the second preset adjustment factor H2 according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the variation of the current color saturation signal and the second color saturation signal for one embodiment of the present invention;
FIG. 7 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. 8 is a schematic diagram of a color difference change 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 driving system of a display panel according to an embodiment of the present invention;
fig. 10 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 conversion module; 130. an adjustment coefficient calculation module; 140. an 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 viewing angle is solved by applying different driving voltages to the main and sub-pixels in space, and such pixel design usually needs to design a metal wiring or a Thin Film Transistor (TFT) element to drive the sub-pixel, which results in the sacrifice of the light-permeable opening area, affects the transmittance of the panel, and directly results in the increase of the backlight cost.
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;
s12, acquiring first color signals Rn _ i, j, Gn _ i, j, Bn _ i, j, and converting each group of RGB three primary color sub-pixel gray scale signals into three primary color normalized brightness signals r, g, b; completing conversion to obtain first normalized brightness signals rn _ i, j, gn _ i, j and bn _ i, j;
s13, calculating a current color saturation signal S as 1-mini, j/maxi, j according to the first normalized brightness signal, and acquiring a first preset adjustment coefficient H corresponding to the current color saturation signal S;
s14, keeping maxi, j unchanged, and adjusting mini, j by using a first preset adjusting coefficient H to obtain a second color saturation signal S' ═ 1-mini, j × H/maxi, j;
s15 converting the second color saturation signal S' to obtain a second color signal in an RGB system to drive the display panel;
where, mini, j is min (rn _ i, j, gn _ i, j, bn _ i, j), where maxi, j is max (rn _ i, j, gn _ i, j, bn _ i, j).
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, under an RGB system, the higher the color saturation of a signal is, the more serious the color cast is; in order to improve the color cast problem, the color saturation value of a color saturation signal with a higher color saturation value needs to be adjusted to be lower; specifically, the color saturation signal S ═ 1-mini, j/maxi, j, where mini, j and maxi, j are variables, and the color saturation value can be adjusted by adjusting both of them, in this scheme, maxi, j is mainly kept unchanged, and the purpose of lowering the color saturation value is achieved by increasing mini, j; after the adjustment, the color saturation signal, especially the color saturation signal with too high color saturation value, is adjusted to be low to improve the problem of color cast, and 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 can be avoided; in addition, the mini and j can be increased, and meanwhile, the brightness of the mini and j can be improved, so that the problem of color cast is solved, the overall brightness of the display panel is improved, and a better display effect is achieved.
In one embodiment, the color saturation signal is divided into at least a first hue interval, a second hue interval, a third hue interval and a non-adjustment interval according to hue differences;
the step of obtaining a first preset adjustment coefficient H corresponding to the current color saturation signal S includes:
acquiring a current color saturation signal of the first color space signal, judging whether the current color saturation signal reaches a preset threshold value, and if so, carrying out a hue interval judgment process;
judging which hue interval the color saturation signal is in, and if the color saturation signal is in a first hue interval, a second hue interval and a third hue interval, acquiring a preset adjustment coefficient corresponding to the current color saturation signal according to the first hue interval, the second hue interval and the third hue interval;
if the color saturation signal is in the non-adjustment color tone interval, judging that the color saturation signal does not reach the preset threshold value, and not adjusting the corresponding color saturation signal or presetting an adjustment coefficient to be 1.
In the scheme, only part of the color saturation signals are subjected to adjustment operation, and the part of the color saturation signals not only need to meet a color saturation threshold value, but also need to meet a hue interval; this is because the correspondence between the color saturation values and the color shifts of different hue ranges is different, and the closer to the dominant hue, the more serious the color shift problem is, for example, in a hue range corresponding to a blue dominant hue of 240 degrees, the same color saturation value, the degree of color shift far exceeds the unadjusted hue range of 300 degrees; at this time, even if the color saturation signal of the 300-degree hue satisfies the color saturation threshold, the corresponding color shift degree may be small and does not need to be improved; therefore, only the color saturation signals meeting the color cast problem of the preset threshold value and the hue interval are adjusted, for example, the color saturation value is reduced, the color cast problem can be improved, meanwhile, unnecessary processing such as color saturation value reduction can be avoided for the signals which do not need color cast adjustment, and the display effect of the display panel can be improved.
And for the color saturation signals reaching the preset threshold value, the adjustment processing of the color saturation can be carried out without further judging the hue interval.
In an embodiment, in the step of determining whether the current color saturation signal reaches the preset threshold value of color saturation, the threshold value of color saturation is 0.5, and if the color saturation value of the current color saturation signal is greater than 0.5, it is determined that the threshold value of color saturation is reached;
if the color saturation value of the current color saturation signal is less than or equal to 0.5, the color saturation threshold value is judged not to be reached, and the corresponding color saturation signal is not adjusted or the preset adjustment coefficient is 1.
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 larger the color cast degree is generally considered; 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 color saturation signal can be divided into at least a first hue interval, a second hue interval, a third hue interval and a non-adjusted hue interval according to hue differences;
the step of obtaining a first preset adjustment coefficient H corresponding to the current color saturation signal S includes:
judging whether the Hue corresponding to the current color saturation signal S is in a first Hue interval, a second Hue interval and a third Hue interval; if yes, judging whether the current color saturation signal meets a preset threshold value; if the preset threshold value is met, acquiring a corresponding preset adjustment coefficient according to the hue interval and the color saturation value;
if the color saturation signal is in the non-adjustment color interval, judging that the color saturation signal is not in the color interval to be adjusted, and not adjusting the corresponding color saturation signal or presetting an adjustment coefficient to be 1.
In the scheme, only part of the color saturation signals are subjected to adjustment operation, and the part of the color saturation signals firstly need to meet a hue interval and then need to meet a color saturation threshold; although a relatively serious problem exists when the color saturation is slightly high in the same hue, some color saturation signals are located in the adjusted hue interval, but the color saturation values are very low, and the corresponding color shift degrees may be in an acceptable range, and because the color saturation values are higher in the same hue, the color shift problem is more serious, for example, the color saturation signal of the blue dominant hue located in the 240-degree hue has a color saturation value greater than 0.5, and the color shift problem needs to be adjusted seriously, and if the color saturation values are less than 0.5, the color shift problem may be less serious, and may not be adjusted; therefore, only the color saturation signal which is located in the hue interval to be adjusted and the color saturation value of which exceeds the preset threshold value is adjusted, for example, the color saturation value is reduced, and the original color saturation value is maintained without performing color cast adjustment, so that the color cast problem can be improved, the reduction of the color saturation can be avoided as much as possible, and the improvement of the display effect is facilitated.
Wherein, for the color saturation signal in the hue interval to be adjusted, the adjustment processing of the color saturation can be carried out without further meeting the preset threshold value; of course, both the hue interval to be adjusted and the color saturation threshold can also be taken into account.
Specifically, the step of determining whether the Hue corresponding to the current color saturation signal S is in the first Hue interval, the second Hue interval, and the third Hue interval includes:
the first hue interval, the second hue interval and the third hue interval respectively comprise one of a red hue interval, a green hue interval and a blue hue interval which are not mutually conflicting;
and the larger the color saturation value of the color saturation signal positioned in the same hue 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; according to the scheme, under the same color saturation value, the lowering amplitude of the color saturation signal in the blue hue interval is the largest, and the lowering amplitude of the color saturation signal in the green hue interval is the smallest, 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 improving effect can be achieved.
Taking S' ═ S × H as an example, 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, the preset adjustment coefficient corresponding to the blue tone interval is the largest and the adjustment range is the largest, and the preset adjustment coefficient corresponding to the green tone interval is the smallest and the adjustment range is the smallest.
In an embodiment, the step of converting the second color signal in the RGB system according to the second color saturation signal S' further includes:
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 color Saturation Value adjustment twice to obtain a second color space signal under an HSV (Hue, Saturation, Value) system;
and converting the second color space signal into a second color signal under an RGB system.
In the scheme, the first preset adjustment coefficient is used for carrying out primary adjustment on the current color saturation signal, and then secondary adjustment is carried out, so that secondary adjustment can be carried out to enhance the adjustment range when some color cast problems are serious but the adjustment range is insufficient in the primary adjustment, 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 color saturation signal is divided into at least a first hue interval, a second hue interval, a third hue interval and a non-adjusted hue interval according to hue differences;
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 current color saturation signal S is located in the Hue adjustment interval, the second color saturation signal S 'obtains a third color saturation signal S' according to a second adjustment coefficient;
when the Hue value of the current color saturation signal S is in the non-adjusted Hue interval, S ═ S.
In the invention, 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 the second color saturation signal S' and a second adjustment coefficient; otherwise, the third color saturation signal S ═ S; therefore, the color saturation signal positioned in the tone adjusting interval can be adjusted for the second time 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 an embodiment of the present invention, referring to fig. 5 and in conjunction with fig. 4, in an embodiment, the third color saturation signal S ″ satisfies the following formula:
S”＝S-(S-S’)*H2；
the second adjustment coefficient H2 satisfies the following equation:
H2＝2*ABS(sin((Hue/360*3-1/2)*π)-1；
the second adjustment coefficient H2 also satisfies the following equation: 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.
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 adjustment coefficient, the more close the color saturation signal of the pure color tone is to obtain secondary adjustment with larger amplitude, and the more far away the color saturation signal of the pure color tone is to obtain secondary adjustment with smaller amplitude; 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 range of Hue values Hue is: 0-360, corresponding to 0-360 degrees, wherein:
the hue interval whose hue satisfies the following formula is divided into red hue intervals: 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;
the hue section having a hue value satisfying the following formula is divided into green hue sections: 80 < Hue < 160;
dividing a hue interval having a hue value satisfying the following formula into blue hue intervals: 200 < Hue < 280;
the hue interval whose hue value satisfies the following formula is a mixed-color 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; 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.
Fig. 6 is a schematic diagram showing changes in the current color saturation signal and the second color saturation signal according to an embodiment of the present invention, and fig. 7 is a graph showing 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. 7 may be in the case of a front view angle. Of course, a side view angle is also possible. The dashed line in fig. 8 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. 9 is a schematic diagram of a driving system of a display panel according to the present invention, and referring to fig. 9, it can be known from fig. 1 to 8 that: the present invention also discloses a driving system 100 of a display panel, which uses the driving method of the display panel according to any of the present invention, including:
a receiving module 110, namely a receiving circuit, for receiving a first color signal under the RGB system;
the conversion module 120, i.e. a conversion circuit, is configured to obtain the first color signals Rn _ i, j, Gn _ i, j, Bn _ i, j, and convert each set of RGB three primary color sub-pixel gray scale signals into three primary color normalized luminance signals r, g, b; completing conversion to obtain first normalized brightness signals rn _ i, j, gn _ i, j and bn _ i, j;
the adjustment coefficient calculation module 130, that is, an adjustment coefficient calculation circuit, is configured to calculate, according to the first normalized luminance signal, a current color saturation signal S ═ 1-mini, j/maxi, j, and obtain a first preset adjustment coefficient H corresponding to the current color saturation signal S;
the adjusting module 140, that is, an adjusting circuit, is configured to keep maxi, j unchanged, and adjust mini, j using a first preset adjusting coefficient H to obtain a second color saturation signal S' ═ 1-mini, j × H/maxi, j;
the driving module 150, i.e. a driving circuit, is configured to convert the second color saturation signal S' into a second color signal in an RGB system to drive the display panel;
where, mini, j is min (rn _ i, j, gn _ i, j, bn _ i, j), where maxi, j is max (rn _ i, j, gn _ i, j, bn _ i, j).
Fig. 10 is a schematic view of a display device according to the present invention, and referring to fig. 10, it can be known from fig. 1 to 9 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;
acquiring first color signals Rn _ i, j, Gn _ i, j and Bn _ i, j, and converting each group of RGB three-primary-color sub-pixel gray scale signals into three-primary-color normalized brightness signals r, g and b; completing conversion to obtain first normalized brightness signals rn _ i, j, gn _ i, j and bn _ i, j;
calculating a current color saturation signal S as 1-mini, j/maxi, j according to the first normalized brightness signal, and acquiring a first preset adjustment coefficient H corresponding to the current color saturation signal S;
keeping maxi, j unchanged, and adjusting mini, j by using a first preset adjustment coefficient H to obtain a second color saturation signal S' ═ 1-mini, j × H/maxi, j;
converting the second color saturation signal S' to obtain a second color signal under an RGB system so as to drive the display panel;
wherein mini, j is min (rn _ i, j, gn _ i, j, bn _ i, j), wherein maxi, j is max (rn _ i, j, gn _ i, j, bn _ i, j);
the step of obtaining the second color signal under the RGB system by converting according to the second color saturation signal S' further includes:
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 color saturation value adjustment twice 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.
2. The method of claim 1, wherein the color saturation signal is divided into at least a first Hue interval, a second Hue interval, a third Hue interval, and a non-adjustment interval according to Hue;
the step of obtaining a first preset adjustment coefficient H corresponding to the current color saturation signal S includes:
obtaining a current color saturation signal of the first color space signal, judging whether the current color saturation signal reaches a color saturation threshold value, and if so, carrying out a hue interval judgment process;
judging which hue interval the color saturation signal is in, and if the color saturation signal is in a first hue interval, a second hue interval and a third hue interval, acquiring a preset adjustment coefficient corresponding to the current color saturation signal according to the first hue interval, the second hue interval and the third hue interval;
if the color saturation signal is in the non-adjustment color tone interval, judging that the color saturation threshold value is not reached, and not adjusting the corresponding color saturation signal or presetting an adjustment coefficient to be 1.
3. The method for driving a display panel according to claim 2, wherein the color saturation threshold is 0.5, and if the color saturation value of the current color saturation signal is greater than 0.5, it is determined that the color saturation threshold is reached;
if the color saturation value of the current color saturation signal is less than or equal to 0.5, the color saturation threshold value is judged not to be reached, and the corresponding color saturation signal is not adjusted or the preset adjustment coefficient is 1.
4. The method of claim 1, wherein the color saturation signal is divided into at least a first Hue interval, a second Hue interval, a third Hue interval, and a non-adjusted Hue interval according to Hue;
the step of obtaining a first preset adjustment coefficient H corresponding to the current color saturation signal S includes:
judging whether the Hue corresponding to the current color saturation signal S is in a first Hue interval, a second Hue interval and a third Hue interval; if yes, judging whether the current color saturation signal meets a color saturation threshold value; if the color saturation threshold value is met, acquiring a corresponding preset adjustment coefficient according to the hue interval and the color saturation value;
if the color saturation signal is in the non-adjustment color interval, judging that the color saturation signal is not in the color interval to be adjusted, and not adjusting the corresponding color saturation signal or presetting an adjustment coefficient to be 1.
5. The method for driving a display panel according to claim 4, wherein the step of determining whether the Hue Hue corresponding to the current color saturation signal S is within the first Hue interval, the second Hue interval, and the third Hue interval comprises:
the first hue interval, the second hue interval and the third hue interval respectively comprise one of a red hue interval, a green hue interval and a blue hue interval which are not mutually conflicting;
and the larger the color saturation value is, the larger the adjustment amplitude of the adjustment processing is.
6. The method for driving a display panel according to claim 1,
the color saturation signal is at least divided into a first Hue interval, a second Hue interval, a third Hue interval and a non-adjustment Hue interval according to different hues Hue;
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 current color saturation signal S is located in the Hue adjustment interval, the second color saturation signal S 'obtains a third color saturation signal S' according to a second adjustment coefficient H2;
when the Hue value of the current color saturation signal S is in the non-adjustment Hue interval, S ═ S;
the third color saturation signal S "conforms to the following formula:
S”＝S-(S-S’)*H2；
the second adjustment coefficient H2 satisfies the following equation:
H2＝2*ABS(sin((Hue/360*3-1/2)*π)-1；
the second adjustment coefficient H2 also satisfies the following equation: h2 is H2 factor, and factor is equal to 1 when the Hue value of the color saturation signal is in the adjusted Hue interval and 0 when the Hue value of the color saturation signal is in the non-adjusted Hue interval.
7. The method of driving a display panel according to claim 2, 4 or 6, wherein the range of the Hue value is: 0-360, corresponding to 0-360 degrees, wherein:
the Hue interval in which the Hue satisfies the following formula is divided into red Hue intervals: 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;
a Hue section in which the Hue value satisfies the following formula is divided into green Hue sections: 80 < Hue < 160;
dividing a Hue interval in which the Hue value satisfies the following formula into blue Hue intervals: 200 < Hue < 280;
a Hue interval in which the Hue value satisfies the following formula is a mixed-color 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.
8. A driving system of a display panel using the driving method of the 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;
the conversion module is used for acquiring first color signals Rn _ i, j, Gn _ i, j and Bn _ i, j and converting each group of RGB three primary color sub-pixel gray scale signals into three primary color normalized brightness signals r, g and b; completing conversion to obtain first normalized brightness signals rn _ i, j, gn _ i, j and bn _ i, j;
the adjustment coefficient calculation module is used for calculating a current color saturation signal S as 1-mini, j/maxi, j according to the first normalized luminance signal and acquiring a first preset adjustment coefficient H corresponding to the current color saturation signal S;
the adjusting module is used for keeping maxi, j unchanged, and adjusting mini, j by using a first preset adjusting coefficient H to obtain a second color saturation signal S' ═ 1-mini, j × H/maxi, j;
the driving module is used for converting the second color saturation signal S' to obtain a second color signal under an RGB system so as to drive the display panel;
where, mini, j is min (rn _ i, j, gn _ i, j, bn _ i, j), where maxi, j is max (rn _ i, j, gn _ i, j, bn _ i, j).
9. A display device characterized by comprising a driving system of a display panel according to claim 8.
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| CN201811511896.4A CN109461417B (en) | 2018-12-11 | 2018-12-11 | Driving method and driving system of display panel and display device |
| PCT/CN2019/077600 WO2020118923A1 (en) | 2018-12-11 | 2019-03-11 | Method, system and device for driving display module |
| PCT/CN2019/077603 WO2020118926A1 (en) | 2018-12-11 | 2019-03-11 | Display panel driving method, driving system, and display device |
| PCT/CN2019/077602 WO2020118925A1 (en) | 2018-12-11 | 2019-03-11 | Driving method and driving system for display module, and display apparatus |
| US16/982,049 US11545096B2 (en) | 2018-12-11 | 2019-03-11 | Driving method of display module, driving system thereof, and driving device |
| US17/042,880 US11355078B2 (en) | 2018-12-11 | 2019-03-11 | Display panel driving method, driving system and display device |
| US17/040,050 US11475854B2 (en) | 2018-12-11 | 2019-03-11 | Driving method of display module, driving system thereof, and display device |
| US17/040,974 US11138942B2 (en) | 2018-12-11 | 2019-03-11 | Driving method of display module, driving system thereof, and driving device |
| PCT/CN2019/077601 WO2020118924A1 (en) | 2018-12-11 | 2019-03-11 | Driving method, system and apparatus for display module |
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