CN109637471B - 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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- CN109637471B CN109637471B CN201811510627.6A CN201811510627A CN109637471B CN 109637471 B CN109637471 B CN 109637471B CN 201811510627 A CN201811510627 A CN 201811510627A CN 109637471 B CN109637471 B CN 109637471B
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- 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
Abstract
The invention discloses a driving method, a driving system and a display device of a display panel, comprising the following steps: receiving a first color signal under an RGB system, and converting the first color signal into a first color space signal under an HSV system; acquiring a current color saturation signal of the first color space signal, judging whether the color tone of the current color saturation signal is in an adjustment color tone adjustment region, and if so, acquiring a preset adjustment coefficient corresponding to the current color saturation signal; adjusting the current color saturation signal by using a preset adjusting coefficient; completing adjustment processing of the color saturation signal to obtain a second color space signal under an HSV system; and converting the second color space signal into a second color signal under an RGB system to drive the display panel. The invention adjusts the color saturation signal based on the hue interval to improve the color shift problem.
Description
Technical Field
The present invention relates to the field of display panel technologies, and in particular, to a driving method, a driving system, and a display device for a display panel.
Background
With the development and progress of science and technology, the lcd has thin body, low power consumption, low radiation, and other hot spots, and thus is the mainstream product of the lcd and widely used. Most of the existing liquid crystal displays in the market are backlight liquid crystal displays (lcds), which include a liquid crystal panel and a backlight module (backlight module). The liquid crystal panel has the working principle that liquid crystal molecules are placed in two parallel glass substrates, and a driving voltage is applied to the two glass substrates to control the rotation direction of the liquid crystal molecules so as to refract light rays of the backlight module out to generate a picture.
Most of the existing large-size liquid crystal display panels adopt a 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, VA mode liquid crystal driving has a problem of color shift at a large viewing angle.
Disclosure of Invention
The invention aims to provide a driving method, a driving system and a display device of a display panel, which can 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 of the first color space signal, judging whether the color tone of the current color saturation signal is in an adjustment color tone adjustment region, and if so, acquiring a preset adjustment coefficient corresponding to the current color saturation signal;
adjusting the current color saturation signal by using a preset adjusting coefficient;
completing adjustment processing of the color saturation signal to obtain a second color space signal under an HSV system;
and converting the second color space signal into a second color signal under an RGB system to drive the display panel.
Optionally, the adjusting process includes adjusting color saturation values of all color saturation signals located in the color adjusting interval according to a preset adjusting coefficient.
Optionally, the adjusting process includes a step of performing color saturation value reduction processing on the color saturation signal in the adjusted color tone interval according to a preset adjustment coefficient.
Optionally, the color saturation signal is split 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 judging whether the color tone of the current color saturation signal is in the adjustment color tone adjustment region, and if so, acquiring a preset adjustment coefficient corresponding to the current color saturation signal comprises the following steps:
judging whether the hue corresponding to the current color saturation signal is in a first hue interval, a second hue interval and a third hue interval, if so, acquiring preset adjustment coefficients corresponding 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 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.
Optionally, the first hue interval is a red hue interval, the second hue interval is a green hue interval, and the third hue interval is a blue hue interval;
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.
Optionally, in the step of obtaining the preset adjustment coefficients corresponding to the first hue interval, the second hue interval, and the third hue interval:
and the preset adjustment coefficients of the color saturation signals with the same color saturation value are different corresponding to the first color tone interval, the second color tone interval and the third color tone interval.
Optionally, the color saturation signal is split into a red hue interval, a green hue interval, a blue hue interval and a non-adjustment hue interval according to different hue intervals;
the Hue value Hue ranges are: 0-360, corresponding to 0-360 degrees, wherein:
the hue interval in which the hue satisfies the following formula is a red 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;
the hue range in which the hue value satisfies the following formula is a green hue range: 80 < Hue < 160;
dividing a hue interval having a hue value satisfying the following formula into blue hue intervals: 200 < Hue < 280;
the hue range in which the hue value satisfies the following formula is a non-adjusted hue range: 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 preset adjustment coefficient is obtained by calculation according to a preset calculation formula or by searching through an adjustment coefficient lookup table.
The present invention also provides a driving system of a display panel, including:
the receiving module is used for receiving a first color signal under an RGB system and converting the first color signal into a first color space signal under an HSV system;
the preset adjustment coefficient calculation module is used for acquiring a current color saturation signal of the first color space signal, judging whether the color tone of the current color saturation signal is in an adjustment color tone adjustment region, and if so, acquiring a preset adjustment coefficient corresponding to the current color saturation signal;
the adjusting module is used for adjusting the current color saturation signal by using a preset adjusting coefficient; completing adjustment processing of the color saturation signal to obtain a second color space signal under an HSV system;
and the driving module is used for converting the second color space signal into a second color signal under an RGB system to drive the display panel.
The invention also discloses a display device comprising the driving system of the display panel.
In the invention, based on color signals under an RGB color system, color cast is relatively serious in certain hue intervals of color saturation signals, and the problem of color cast is not obvious in other hue intervals, even belongs to an acceptable range; the method comprises the steps of acquiring a current color saturation signal, and at least dividing the current color saturation signal into a part in an adjustment color adjustment interval and another part outside the adjustment color adjustment interval according to different corresponding hues; the color saturation signal corresponding to the color adjustment interval is used for acquiring a preset adjustment coefficient corresponding to the current color saturation signal and adjusting the color saturation, so that the color saturation signal with more serious color cast problem is controlled in an area with less serious color cast problem, the color cast problem is improved, and the adjustment amplitude can be reduced or even not adjusted for the color saturation signal with less serious color cast problem, namely the color saturation signal outside the hue interval to be adjusted, so that the color cast problem is improved, the adjustment of the color saturation is reduced as much as possible, the excessive damage of the color saturation is avoided, the balance of the color cast and the color saturation is achieved, and the display effect is 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 schematic diagram of a variation of a current color saturation signal and a second color saturation signal of an embodiment of the present invention;
FIG. 6 is a graph of color difference change for a current color saturation signal and a second color saturation signal for an embodiment of the present invention;
FIG. 7 is a schematic diagram of the variation of color difference between a current color saturation signal and a second color saturation signal in accordance with an embodiment of the present invention;
FIG. 8 is a schematic diagram of a driving system of a display panel according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a display device according to an embodiment of the invention.
100, a driving system of the display panel; 200. a display device; 110. a receiving module; 120. a preset adjustment coefficient calculation module; 130. an adjustment module; 140. and a driving module.
Detailed Description
Specific structural and functional details disclosed herein are merely representative and are provided for purposes of describing example embodiments of the present invention. The present invention may, however, be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
The invention is further illustrated by the following figures and examples.
Large-sized lcd panels, especially VA (vertical alignment) lcd panels, have a corresponding large viewing angle brightness that is rapidly saturated with voltage, resulting in a severe deterioration in viewing angle image quality contrast and color shift compared to front view image quality.
Fig. 1 is a schematic diagram of color shift variation of various representative color systems of an lcd in a large viewing angle and a front viewing angle, and referring to fig. 1, it can be clearly seen that the color shift of R, G, B hue in the large viewing angle is worse than that in other color systems.
An exemplary solution is to subdivide each sub-pixel of RGB (Red, Green, Blue) into main/sub-pixels (main/sub), so that the overall large-view luminance is closer to the front view with voltage variation.
Fig. 2 is a schematic diagram of a first comparison without distinguishing primary and secondary pixels, and fig. 3 is a schematic diagram of a second comparison without distinguishing primary and secondary pixels, as can be seen with reference to fig. 2 and 3, wherein the x-coordinate, the y-coordinate, and the z-coordinate respectively represent three directions of a three-dimensional space; the thetaa represents the pretilt angle at which the main pixel has a large voltage, and the thetab represents the pretilt angle at which the sub pixel has a small voltage. In fig. 3, the abscissa is a gray scale signal, and the ordinate is a luminance signal, and at a large viewing angle, the luminance is rapidly saturated with the signal, which causes a color shift problem (fig. 3, a left arc segment) at the large viewing angle, and the problem can be improved to a certain extent by distinguishing the primary and secondary pixels.
Specifically, the original signal is divided into primary and secondary pixels with large voltage and small voltage, the large voltage and the small voltage are added to maintain the change of the original front-view signal with the brightness, the side-view brightness seen by the large voltage changes along with the gray scale, i.e., PART a in fig. 3, and the side-view brightness seen by the small voltage changes along with the gray scale, i.e., PART B in fig. 3. Therefore, the brightness of the side-looking composite looks like a left arc line along with the gray scale change and is closer to the relation of the front-looking brightness of a right straight line along with the gray scale change, so that the relation of the visual angle brightness along with the signal change is close to the relation of the front-looking original signal brightness along with the signal change, and the visual angle is improved.
The defect of color shift of a viewing angle is solved by applying different driving voltages to the main pixel and the sub-pixel in space, so that the pixel design usually needs to design a metal wire or a Thin Film Transistor (TFT) element to drive the sub-pixel, the light-permeable opening area is sacrificed, the panel transmittance is influenced, and the backlight cost is directly improved.
Therefore, the invention is based on different technical concepts, and the following schemes are improved and obtained:
fig. 4 is a flowchart of a driving method of a display panel according to the present invention, and as shown in fig. 4, an embodiment of the present invention discloses a driving method of a display panel, including:
s11: receiving a first color signal under an RGB system, and converting the first color signal into a first color space signal under an HSV system;
s12, acquiring a current color saturation signal of the first color space signal, judging whether the color tone of the current color saturation signal is in an adjustment color tone adjustment region, and if so, acquiring a preset adjustment coefficient corresponding to the current color saturation signal;
s13, adjusting the current color saturation signal by using a preset adjusting coefficient;
s14, completing the adjustment process of the color Saturation signal to obtain a second color space signal under HSV (Hue, Saturation) system;
and S15, converting the second color space signal into a second color signal under an RGB system to drive the display panel.
The driving system for using the driving method can be arranged at the front end and in a time sequence control chip of the display panel, and parameters such as a preset adjustment coefficient lookup table related to the performance of the display panel corresponding to the driving system are stored in the time sequence control chip.
In the invention, based on color signals under an RGB color system, color cast is relatively serious in certain hue intervals of color saturation signals, and the problem of color cast is not obvious in other hue intervals, even belongs to an acceptable range; the method comprises the steps of acquiring a current color saturation signal, and at least dividing the current color saturation signal into a part in an adjustment color adjustment interval and another part outside the adjustment color adjustment interval according to different corresponding hues; the color saturation signal corresponding to the color adjustment interval is used for acquiring a preset adjustment coefficient corresponding to the current color saturation signal and adjusting the color saturation, so that the color saturation signal with more serious color cast problem is controlled in an area with less serious color cast problem, the color cast problem is improved, and the adjustment amplitude can be reduced or even not adjusted for the color saturation signal with less serious color cast problem, namely the color saturation signal outside the hue interval to be adjusted, so that the color cast problem is improved, the adjustment of the color saturation is reduced as much as possible, the excessive damage of the color saturation is avoided, the balance of the color cast and the color saturation is achieved, and the display effect is 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 an embodiment, the adjusting process includes adjusting color saturation values of all color saturation signals located in the color adjusting interval according to a preset adjusting coefficient.
In the scheme, the color saturation signals of all the hues in the color adjustment interval are respectively adjusted according to the corresponding preset adjustment coefficients, and the problem of color cast can be better improved after the adjustment processing is carried out in view of the relatively serious problem of the color cast of the color saturation signals in the color interval to be adjusted; moreover, the adjustment is carried out, so that the uniformity of the color saturation of the signal is conveniently controlled, and the display effect of the display panel is favorably improved.
In an embodiment, the adjusting process includes a step of performing a color saturation value reduction process on the color saturation signal in the adjusted color tone interval according to a preset adjustment coefficient.
In the scheme, in view of the fact that color shift problems exist in color saturation signals in a tone adjusting interval, the color shift problem is more serious when the color saturation value is higher, and the degree of the color shift can be reduced by reducing the color saturation value on the basis of finding that the color shift problem is more serious when the color saturation value is higher under the same tone; the adjustment operation of the color saturation is to perform color saturation value reduction processing on a color saturation signal positioned in an adjustment color tone interval; therefore, the color saturation value of the second color signal under the RGB system can be reduced, so that the problem of color cast caused by the overhigh color saturation value of the corresponding color signal is avoided, and the problem of large-viewing-angle color cast of the display panel, particularly the VA type panel, is improved.
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 judging whether the color tone of the current color saturation signal is in the adjustment color tone adjustment region, and if so, acquiring a preset adjustment coefficient corresponding to the current color saturation signal comprises the following steps:
judging whether the hue corresponding to the current color saturation signal is in a first hue interval, a second hue interval and a third hue interval, if so, acquiring preset adjustment coefficients corresponding 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 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.
In an embodiment, if yes, the step of obtaining the preset adjustment coefficients corresponding to the first hue interval, the second hue interval, and the third hue interval includes:
judging whether the hue corresponding to the current color saturation signal is in a red hue interval, a green hue interval and a blue hue interval, if so, judging that the hue is in an adjustment hue interval;
judging whether the color saturation value of the color saturation signal in the color adjusting interval reaches a preset threshold value or not;
and if so, acquiring a preset adjustment coefficient corresponding to the current color saturation signal according to the hue interval and the color saturation value.
In the scheme, the hue interval to be adjusted comprises a red hue interval, a green hue interval and a blue hue interval, and the relation between the change of the color saturation value of each hue interval and the change of the color cast problem degree is different; the preset adjustment coefficients are obtained corresponding to different hue intervals, hue values and color saturation values respectively, and corresponding color saturation signals can be adjusted in a targeted manner, so that the problem of color cast is better improved.
In one embodiment, in the step of splitting the hue interval, the first hue interval is a red hue interval, the second hue interval is a green hue interval, and the third hue interval is a blue hue interval;
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 or S is the current color saturation signal corresponding to the first color space signal, S ' is the adjusted color saturation signal or S ' is the color saturation signal corresponding to the second color space signal, and H is the preset adjustment coefficient), the larger the adjustment amplitude is, the smaller the value of the preset adjustment coefficient is; if the preset adjustment coefficient is a coefficient of a certain parameter of the color saturation signal, the larger the adjustment amplitude is, the larger the corresponding coefficient may also be, for example, when S ' is 1-min × H/max (where S is the current color saturation signal or S is the current color saturation signal corresponding to the first color space signal, S ' is the adjusted color saturation signal or S ' is the color saturation signal corresponding to the second color space signal, and H is the preset adjustment coefficient), the larger the preset adjustment coefficient is, the larger the corresponding adjustment amplitude is.
In an embodiment, the step of obtaining the preset adjustment coefficients corresponding to the first color range, the second color range, and the third color range includes:
and the preset adjustment coefficients corresponding to the current color saturation signals with the same color saturation value are different corresponding to the first color tone interval, the second color tone interval and the third color tone interval.
In the scheme, on the basis of different color cast problem degrees of color saturation signals of different color cast intervals, under the condition of the same color saturation value, the color cast of a part of the color cast intervals is serious, the color cast of a part of the color cast intervals is lighter, for the color cast intervals with more obvious color cast problems, the corresponding color saturation signals can be greatly reduced, and for the color cast intervals with less obvious color cast problems, the color cast can be reduced to a smaller extent, so that the color cast problem can be better improved; of course, for a hue interval with less serious color shift problem, if the hue interval does not reach the preset threshold, the color saturation value of the hue interval may be increased to a certain degree.
The color cast problem degree based on the color saturation signals of different hue intervals is different, under the condition of the same color saturation value, the color cast of a part of the hue intervals is serious, and the color cast of a part of the hue intervals is lighter; corresponding to an RGB system, specifically, the color cast problem of a color saturation signal in a blue hue interval is the most serious, and the color cast problem of the color saturation signal in a green hue interval is the least serious; according to the scheme, different preset adjustment coefficients are preset for color saturation signals which meet preset threshold values and are serious in color cast according to different color cast degrees.
Specifically, 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. Therefore, the signal with the highest color saturation value has the largest lowering amplitude, and the signal with the smallest color saturation value has the smallest lowering amplitude, so that the color cast problem caused by the overlarge color saturation value is reduced, the color saturation of the color saturation signal is more uniform, the color cast problem is favorably improved to a certain extent, and the good color cast improvement effect is 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 one embodiment, the color saturation signal is divided into a red hue interval, a green hue interval, a blue hue interval and a non-adjustment hue interval according to different hue intervals;
the Hue value Hue ranges are: 0-360, corresponding to 0-360 degrees, wherein:
the hue interval in which the hue satisfies the following formula is a red 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;
the hue range in which the hue value satisfies the following formula is a green hue range: 80 < Hue < 160;
dividing a hue interval having a hue value satisfying the following formula into blue hue intervals: 200 < Hue < 280;
the hue range in which the hue value satisfies the following formula is a non-adjusted hue range: 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, in view of the RGB system, the red hue at 0 degree, the green hue at 120 degrees and the blue hue at 240 degrees are defined, on the premise of the same color saturation value, the closer to the red, green and blue hues, the more serious the color cast problem is, and the lighter the saturation signal color cast problem which is farther from the red, green and blue hues is, even the more in line with the color cast standard, the color cast adjustment is not needed; in the scheme, the green hue close to the green hue is divided into a green hue interval, the blue hue close to the blue hue is divided into a blue hue interval, and the red hue close to the red hue is divided into a red hue interval; the hue far away from the red, green and blue colors is divided into non-adjustment intervals, so that the maximum preset adjustment coefficient can be correspondingly set in the blue hue interval with the most serious color cast corresponding to the same color saturation value; correspondingly setting a smaller preset adjustment coefficient in a green hue interval with a lighter color cast problem; and for the non-adjustment interval which hardly has the color cast problem, no adjustment is carried out or the preset adjustment coefficient is set to be 1, so that the color cast problem is improved, meanwhile, the reduction of the color saturation value is avoided as much as possible, and the display effect of the display panel is favorably improved.
In an embodiment, in the step of determining whether the color saturation value of the current color saturation signal reaches the preset threshold:
the color saturation threshold value is 0.5, and if the color saturation value of the current color saturation signal is greater than 0.5, the color saturation threshold value is judged to be 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.
The preset adjustment coefficient is obtained by calculation according to a preset calculation formula or by searching through an adjustment coefficient lookup table.
In the scheme, a corresponding calculation formula or an adjustment coefficient lookup table is obtained in advance through a pre-test or calculation, so that different preset adjustment coefficients can be obtained according to different color saturation signals (color saturation values, hue intervals and the like) when the current color saturation signal is obtained, the color saturation values of the color saturation signals are adjusted to different degrees, and the 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 corresponding to the first color space signal, and S' is a color saturation signal corresponding to the second color space signal; and the a, b, c, d and e are constants, and the a, b, c, d and e are obtained by searching through a preset formula coefficient lookup table according to different color saturation values and different hue intervals.
In the scheme, the preset adjustment coefficient can be obtained by calculation according to a preset calculation formula, although the calculation formula is different, the calculation formula can generally satisfy a fourth-order polynomial, wherein the constant coefficients a, b, c, d and e are obtained by searching through a preset lookup table according to the difference between the color saturation value and the hue interval; of course, other calculation formulas are also applicable, for example, when the color saturation value S satisfies a certain condition, the preset adjustment coefficient is equal to the root number S; when the color saturation value S satisfies another condition, it is also possible to preset a formula in which the adjustment coefficient is equal to the cubic root S.
Fig. 5 is a schematic diagram of changes in a current color saturation signal and a second color saturation signal according to an embodiment of the present invention, fig. 6 is a graph illustrating changes in color difference between the current color saturation signal and the second color saturation signal according to an embodiment of the present invention, and fig. 7 is a schematic diagram illustrating changes in color difference between the current color saturation signal and the second color saturation signal according to an embodiment of the present invention.
The color difference change map of fig. 6 may be in the case of a front view angle. Of course, a side view angle is also possible. The dashed line in fig. 7 is the corresponding color difference change of the current color saturation signal in various color systems, and the solid line is the corresponding color difference change of the second color saturation signal in various color systems.
Specifically, if the display is driven with 8-bit color resolution, the gray scale of the RGB input signals can be decomposed into 0,1,2 … 255 gray scale driving signals. The invention converts RGB three primary colors input signals into HSV color space signals, and adjusts the color saturation according to different hue and saturation values in the HSV color space to achieve the effect of improving the color cast.
Referring to fig. 1, it can be clearly found that the color shift of R, G, B hue in the large viewing angle of the color system is more serious than that of other color systems due to the variation of the large viewing angle and the front viewing angle of various representative color systems of the lcd, so that the problem of R, G, B hue color shift can be solved to greatly improve the overall color shift improvement of the large viewing angle.
The calculation method for converting the color signals or RGB three-primary-color signals into HSV signals in the RGB system is described as follows:
the input signal of RGB three primary colors is 8bit gray scale digital signal of 0,1, … 255, and the brightness normalization signal (taking 255 gray scale as maximum brightness) corresponding to 255 input signal of each gray scale signal is r, g, b respectively.
Where R ═ R/255 ^ γ R, G ^ γ G, B ^ B (B/255) ^ γ B, where γ R, γ G, γ B are so-called gamma signals, the digital gray-scale signals are converted into exponential parameters of the luminance signals. H is 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 pure color change, 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, should satisfy:
Δ uv √ (u _1-u _2) ^2+ (v _1-v _2) ^2) ≦ 0.02. Where u _1 and v _1 are the chromaticity coordinates of the current color saturation signal and u _2 and v _2 are the chromaticity coordinates of the second color saturation signal, i.e. the color saturation signal after color saturation adjustment.
Fig. 8 is a schematic diagram of a driving system of a display panel according to the present invention, and referring to fig. 8, it can be known from fig. 1 to 7 that: the invention also discloses a driving system 100 of a display panel, which uses the driving method of the display panel according to the invention, and comprises the following steps:
the receiving module 110, i.e., a receiving circuit, receives the first color signal in the RGB system, and converts the first color signal into a first color space signal in the HSV system;
the preset adjustment coefficient calculation module 120, that is, the preset adjustment coefficient calculation circuit, acquires a current color saturation signal of the first color space signal, and determines whether a color tone of the current color saturation signal is within an adjustment color tone adjustment region, and if so, acquires a preset adjustment coefficient corresponding to the current color saturation signal;
the adjusting module 130, i.e. an adjusting circuit, adjusts the current color saturation signal by using a preset adjusting coefficient; completing adjustment processing of the color saturation signal to obtain a second color space signal under an HSV system;
the driving module 140, i.e., the driving circuit, drives the display panel by converting the second color space signal into a second color signal under the RGB system.
Fig. 9 is a schematic view of a display device according to the present invention, and referring to fig. 9, it can be known from fig. 1 to 8 that: the invention also discloses a display device 200 comprising a driving system 100 of a display panel according to the invention.
It should be noted that, the limitations of the steps involved in the present disclosure are not considered to limit the order of the steps without affecting the implementation of the specific embodiments, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all should be considered to belong to the protection scope of the present disclosure.
The technical solution of the present invention can be widely applied to various display panels, such as TN type display panels (called Twisted Nematic panels), IPS type display panels (In-Plane Switching), VA type display panels (Vertical Alignment technology), MVA type display panels (Multi-domain Vertical Alignment technology), and of course, other types of display panels, such as organic light-emitting display panels (OLED display panels for short), which can be applied to the above solutions.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (11)
1. A method of driving a display panel, comprising the steps of:
receiving a first color signal under an RGB system, and converting the first color signal into a first color space signal under an HSV system;
acquiring a current color saturation signal of the first color space signal, judging whether the color tone of the current color saturation signal is in an adjustment color tone adjustment region, and if so, acquiring a preset adjustment coefficient corresponding to the current color saturation signal;
adjusting the current color saturation signal by using a preset adjusting coefficient;
completing adjustment processing of the color saturation signal to obtain a second color space signal under an HSV system;
converting the second color space signal into a second color signal under an RGB system to drive the display panel;
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 corresponding to the first color space signal, and S' is a second color saturation signal corresponding to the second color space signal; and the a, b, c, d and e are constants, and the a, b, c, d and e are obtained by searching through a preset formula coefficient lookup table according to different color saturation values and different hue intervals.
2. The method for driving a display panel according to claim 1, wherein the adjusting process is performed by adjusting the color saturation value of all the color saturation signals located in the color adjustment interval according to a preset adjustment coefficient.
3. The method for driving a display panel according to claim 1, wherein the adjustment processing is performed by performing a color saturation value reduction processing on the color saturation signal in the adjusted hue interval according to a preset adjustment coefficient.
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 difference;
the step of judging whether the color tone of the current color saturation signal is in the adjustment color tone adjustment region, and if so, acquiring a preset adjustment coefficient corresponding to the current color saturation signal comprises the following steps:
judging whether the hue corresponding to the current color saturation signal is in a first hue interval, a second hue interval and a third hue interval, if so, acquiring preset adjustment coefficients corresponding 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 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 according to claim 4, wherein the first tone region is a red tone region, the second tone region is a green tone region, and the third tone region is a blue tone region;
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.
6. The method as claimed in claim 4, wherein the step of obtaining the preset adjustment coefficients corresponding to the first tone region, the second tone region and the third tone region comprises:
and the preset adjustment coefficients of the color saturation signals with the same color saturation value are different corresponding to the first color tone interval, the second color tone interval and the third color tone interval.
7. The method of claim 1, wherein the color saturation signal is divided into a red hue interval, a green hue interval, a blue hue interval, and a non-adjusted hue interval according to hue intervals;
the Hue value Hue ranges are: 0-360, corresponding to 0-360 degrees, wherein:
the Hue interval in which the Hue value Hue satisfies the following formula is a red 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;
the Hue interval in which the Hue value Hue satisfies the following formula is a green Hue interval: 80 < Hue < 160;
the Hue section in which the Hue value Hue satisfies the following formula is divided into blue Hue sections: 200 < Hue < 280;
the Hue interval in which the Hue value Hue satisfies the following formula is a 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.
8. The method as claimed in claim 1, wherein the predetermined adjustment factor is calculated according to a predetermined calculation formula or is obtained by looking up an adjustment factor look-up table.
9. The method of driving a display panel according to claim 1, further comprising a detecting step of:
converting the current color saturation signal and the second color saturation signal into a CIE Lu 'v' color space signal, wherein L is a luminance coordinate and u 'and v' are chromaticity coordinates;
the change of the current color saturation signal S to the second color saturation signal S' should satisfy:
Δuv＝√((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.
10. A driving system of a display panel using a driving method of a display panel according to any one of claims 1 to 9, comprising:
the receiving module is used for receiving a first color signal under an RGB system and converting the first color signal into a first color space signal under an HSV system;
the preset adjustment coefficient calculation module is used for acquiring a current color saturation signal of the first color space signal, judging whether the color tone of the current color saturation signal is in an adjustment color tone adjustment region, and if so, acquiring a preset adjustment coefficient corresponding to the current color saturation signal;
the adjusting module is used for adjusting the current color saturation signal by using a preset adjusting coefficient; completing adjustment processing of the color saturation signal to obtain a second color space signal under an HSV system;
and the driving module is used for converting the second color space signal into a second color signal under an RGB system to drive the display panel.
11. A display device characterized by comprising a driving system of the display panel according to claim 10.
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| CN101866641A (en) * | 2010-03-09 | 2010-10-20 | 华映视讯（吴江）有限公司 | The color adjustment method of image |
| CN107909553A (en) * | 2017-11-02 | 2018-04-13 | 青岛海信电器股份有限公司 | A kind of image processing method and equipment |
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| CN101115211A (en) * | 2007-08-30 | 2008-01-30 | 四川长虹电器股份有限公司 | Color independent reinforcement processing method |
| CN101866641A (en) * | 2010-03-09 | 2010-10-20 | 华映视讯（吴江）有限公司 | The color adjustment method of image |
| CN107909553A (en) * | 2017-11-02 | 2018-04-13 | 青岛海信电器股份有限公司 | A kind of image processing method and equipment |
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