CN109671399B - Driving method and driving system of display module and display device - Google Patents
Driving method and driving system of display module and display device Download PDFInfo
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- CN109671399B CN109671399B CN201811511884.1A CN201811511884A CN109671399B CN 109671399 B CN109671399 B CN 109671399B CN 201811511884 A CN201811511884 A CN 201811511884A CN 109671399 B CN109671399 B CN 109671399B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
Abstract
The invention discloses a driving method, a driving system and a display device of a display module, which comprises a display panel driving process of synchronous driving and a backlight module driving process: the display module comprises a plurality of independently controlled first color light sources and second color light sources; the display surface driving process includes the steps of: receiving a first color signal, and performing color saturation adjustment on the first color signal to obtain a second color signal; driving the display panel using the second color signal; the backlight module driving process comprises the following steps: receiving a first color signal, obtaining a second color signal, and obtaining a light source adjustment coefficient according to the first color signal and the second color signal; adjusting a first brightness value corresponding to the first color light source and/or the second color light source by using the light source adjustment coefficient to obtain a second brightness value; the first color light source and/or the second color light source are driven using the second luminance value. The invention can improve the color cast problem and ensure the color saturation to be presented.
Description
Technical Field
The invention relates to the technical field of display panels, in particular to a driving method, a driving system and a display device of a display panel module.
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.
In one approach, which was used by the inventors and is not disclosed, the color shift problem is improved by adjusting the color saturation of the signal, but doing so, there is a loss in the color saturation rendering effect of the signal.
Disclosure of Invention
The invention aims to provide a driving method, a driving system and a display device of a display module, which can improve the color cast problem and maintain good color saturation.
In order to achieve the above object, the present invention provides a driving method of a display module, which includes a display panel driving process of synchronous driving and a backlight module driving process:
the display module comprises a plurality of independently controlled first color light sources and second color light sources; the display surface driving process includes the steps of:
receiving a first color signal corresponding to the display panel, and performing color saturation adjustment on the first color signal to obtain a second color signal; driving the display panel using the second color signal;
the backlight module driving process comprises the following steps:
receiving a first color signal corresponding to the display panel, obtaining a second color signal, and obtaining a light source adjustment coefficient according to the first color signal and the second color signal; adjusting a first brightness value corresponding to the first color light source and/or the second color light source by using the light source adjustment coefficient to obtain a second brightness value; the first color light source and/or the second color light source are driven using the second luminance value.
In the invention, in a technology which is known by the inventor and is not disclosed, because the RGB system is easy to have a problem of serious color cast under a high color saturation value, the color saturation of the first color signal is adjusted (generally, the color saturation value is adjusted to be low), and the color cast problem of the obtained second color signal can be well improved; however, since the color saturation value is adjusted, the color saturation of the image is deteriorated; the second brightness value is that the intensity of the light source is adjusted while the color saturation is adjusted, and the color saturation signal with damaged color saturation is returned to the saturated hue from the unsaturated color point, so that the color cast is reduced, especially the color cast with large visual angle, and the good appearance of the color saturation is maintained, and the good color pure color expression 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 flow chart of a driving process of a display panel according to one embodiment of the present invention;
FIG. 5 is a flowchart illustrating a driving process of the backlight module according to one embodiment of the present invention;
FIG. 6 is a schematic view of a direct type display module according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating the correlation function of the second preset adjustment factor H2 according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a variation of a current color saturation signal and a second color saturation signal for one embodiment of the present invention;
FIG. 9 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. 10 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 one embodiment of the present invention;
FIG. 11 is a schematic diagram of a driving system of a display panel according to an embodiment of the invention;
FIG. 12 is a diagram of a driving circuit of a display panel according to an embodiment of the present invention;
FIG. 13 is a schematic diagram of a driving circuit of a backlight module according to an embodiment of the invention;
fig. 14 is a schematic view of a display device according to one embodiment of the present invention.
100, a driving system of the display panel; 200. a display device; 110. a display panel drive circuit; 111. a color saturation adjustment module; 112. a display panel driving module; 120. a backlight module driving circuit; 121. a light source adjustment calculation module; 122. a light source adjusting module; 123. a backlight module driving module; 130. a first color light source; 140. a second color light source.
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 (Multi-domain 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 wire 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 illustrating a driving process of a display panel according to an embodiment of the present invention; FIG. 5 is a flowchart illustrating a driving process of the backlight module according to an embodiment of the present invention; as shown in fig. 4 and 5, an embodiment of the present invention discloses a driving method of a display module, which includes a display panel driving process of synchronous driving and a backlight module driving process:
the display module comprises a plurality of independently controlled first color light sources and second color light sources; the display panel driving process includes the steps of:
s11, receiving a first color signal corresponding to the display panel, and adjusting the color saturation of the first color signal to obtain a second color signal;
s12, driving the display panel by using the second color signal;
the backlight module driving process comprises the following steps:
s21, receiving a first color signal corresponding to the display panel, obtaining a second color signal, and obtaining a light source adjustment coefficient according to the first color signal and the second color signal;
s22, adjusting the first brightness value corresponding to the first color light source and/or the second color light source by using the light source adjustment coefficient to obtain a second brightness value;
and S23, driving the first color light source and/or the second color light source using the second luminance value.
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, in a technology which is known by the inventor and is not disclosed, because the RGB system is easy to have a problem of serious color cast under a high color saturation value, the color saturation of the first color signal is adjusted (generally, the color saturation value is adjusted to be low), and the color cast problem of the obtained second color signal can be well improved; however, since the color saturation value is adjusted, the color saturation of the image is deteriorated; the second brightness value is that the intensity of the light source is adjusted while the color saturation is adjusted, and the color saturation signal with damaged color saturation is returned to the saturated hue from the unsaturated color point, so that the color cast is reduced, especially the color cast with large visual angle, and the good appearance of the color saturation is maintained, and the good color pure color expression is achieved.
The driving process of the display panel and the driving process of the backlight module can be performed independently and simultaneously, for example, in the driving process of the backlight module, the second color signal can be obtained independently from the driving process of the display panel and calculated independently; of course, the second color signal may be obtained by calculation in the display panel driving process, and then transmitted to the backlight module (corresponding signal processing module) to be recalculated to obtain the light source adjustment coefficient, as long as the display panel and the backlight module are controlled to be driven synchronously at last.
The first color signal and the second color signal are signals in an RGB system, and in the step of adjusting the color saturation, stimulus value signals of each pixel, such as r, g, b stimulus value signals, can be directly adjusted to adjust the color saturation value. The first color signal can be converted to other systems to adjust the color saturation value.
Fig. 6 is a schematic view of a direct-type backlight display module, referring to fig. 6, and referring to fig. 4 and fig. 5, in this embodiment, the display panel is a direct-type backlight display module, the direct-type backlight display module includes a plurality of backlight partitions, and each of the backlight partitions includes a plurality of independently controlled first color light sources and second color light sources;
the backlight partition further includes a plurality of independently controlled first color light sources and second color light sources. The backlight module includes a plurality of backlight partitions, each of which includes at least two independently controlled light sources, or three independently controlled light sources as shown in fig. 6, or other suitable structures.
In the scheme, the display panel is a direct-type backlight panel, the display panel can better realize the technology of compensating color saturation loss through light source intensity adjustment, and specifically, each backlight partition comprises a plurality of independently controlled first color light sources, second color light sources and third color light sources; thus, it can be determined by calculation which light source intensity of which light source or light sources is/are increased to help supplement the color saturation, and the color shift problem can be improved and good pure color expression can be maintained.
Of course, the first color light source, the second color light source and the third color light source may be a red independent light source, a green independent light source and a blue independent light source, and a yellow independent light source or a white independent light source may be additionally added, so that the method is applicable.
In one embodiment, the calculation of the light source adjustment coefficient includes the following steps:
acquiring first color signals and second color signals of all pixels in a current backlight partition corresponding to a current frame, and respectively calculating a first average color saturation signal Sn _ ave corresponding to the first color signals and a second average color saturation signal S' n _ ave corresponding to the second color signals;
and calculating to obtain a light source adjustment coefficient according to the first average color saturation signal Sn _ ave and the second average color saturation signal S' n _ ave. In the scheme, the adjustment of the light source intensity is performed by taking one backlight partition as a unit, the difference between the color saturation signals before and after the color saturation adjustment operation is measured by calculating the first average color saturation signal Sn _ ave corresponding to the first color signal and the second average color saturation signal S' n _ ave corresponding to the second color signal, and then the light source adjustment coefficient is calculated based on the difference between the two, so that the backlight partition of the display panel can improve the color cast problem, and simultaneously, the backlight partition is taken as a whole, and each backlight partition independently compensates the color saturation to maintain good color purity performance.
In one embodiment, the first color signal is a RGB three primary color signal in an RGB system, and the first color signal includes a red sub-pixel signal, a green sub-pixel signal, and a blue sub-pixel signal; the step of obtaining the light source adjustment coefficient according to the first color signal and the second color signal comprises:
acquiring first color signals of all pixels in a current backlight partition corresponding to a current frame, and calculating a maximum average signal maxn _ ave and a minimum average signal minn _ ave in corresponding red sub-pixel average signals, green sub-pixel average signals and blue sub-pixel average signals;
obtaining a first average color saturation signal Sn _ ave which is calculated according to the maximum average signal and the minimum average signal and is 1-minn _ ave/maxn _ ave;
calculating a maximum average signal max 'n _ ave and a minimum average signal min' n _ ave of the second color signal;
obtaining a second average color saturation signal S ' n _ ave which is 1-min ' n _ ave/max ' n _ ave calculated according to the maximum average signal and the minimum average signal;
calculating the light source adjustment coefficient y according to the first average color saturation signal and the second average color saturation signal, so that the light source adjustment coefficient y satisfies the following formula:
sn _ ave ═ 1-minjn _ ave/maxn _ ave ═ 1-min 'n _ ave/(max' n _ ave ×), i.e., y ═ min 'n _ ave × maxn _ ave)/(minn _ ave × max' n _ ave). In the scheme, the saturation calculation of each pixel is omitted, and only r, g and b color signals of each backlight subarea are averaged to calculate the average color saturation signal of the whole backlight subarea, so that the calculation complexity is reduced; specifically, a maximum average signal maxn _ ave and a minimum average signal minn _ ave corresponding to all pixels of the first color signal, and a maximum average signal max 'n _ ave and a minimum average signal min' n _ ave corresponding to all pixels of the second color signal are calculated, and then a first average color saturation signal and a second average color saturation signal are calculated according to a formula S1-min/max, so that a light source adjustment coefficient can be calculated based on the first average color saturation signal and the second average color saturation signal; and the light source adjusting coefficient is used for adjusting the value of max' n _ ave in the step of adjusting the light source intensity, so that the third color saturation average signal after adjustment is equal to the first color saturation average signal, and the damage of color saturation presentation can be reduced while the color cast problem is improved by adjusting the light source intensity through the light source adjusting coefficient.
In one embodiment, the first color signal is a RGB three primary color signal in an RGB system, and the first color signal includes a red sub-pixel signal, a green sub-pixel signal, and a blue sub-pixel signal; the step of obtaining the light source adjustment coefficient according to the first color signal and the second color signal comprises:
acquiring first color signals of all pixels in a current backlight partition corresponding to a current frame, and calculating a maximum average signal maxn _ ave and a minimum average signal minn _ ave in corresponding red sub-pixel average signals, green sub-pixel average signals and blue sub-pixel average signals;
obtaining a first average color saturation signal Sn _ ave which is calculated according to the maximum average signal and the minimum average signal and is 1-minn _ ave/maxn _ ave;
calculating a maximum average signal max 'n _ ave and a minimum average signal min' n _ ave of the second color signal; obtaining a second average color saturation signal S ' n _ ave which is 1-min ' n _ ave/max ' n _ ave calculated according to the maximum average signal and the minimum average signal;
calculating the light source adjustment coefficient y according to the first average color saturation signal and the second average color saturation signal, so that the light source adjustment coefficient y satisfies the following formula:
Sn_ave＝1-minn_ave/maxn_ave＝1-(min’n_ave/max’n_ave)*y
that is, y is (minn _ ave × max 'n _ ave)/(min' n _ ave × maxn _ ave).
In this embodiment, specifically, the maximum average signal maxn _ ave and the minimum average signal minn _ ave corresponding to the first color signal and the maximum average signal max 'n _ ave and the minimum average signal min' n _ ave corresponding to the second color signal are calculated, and the first average color saturation signal and the second average color saturation signal are calculated according to the formula S ═ 1-min/max, so that the light source adjustment coefficient can be calculated based on the first average color saturation signal and the second average color saturation signal, wherein the light source adjustment coefficient is used to adjust the value of min 'n _ ave/max' n _ ave in the step of adjusting the light source intensity, and can be the adjustment min 'n _ ave, the adjustment max' n _ ave, or both of them can be adjusted so that the third color saturation average signal is equal to the first color saturation average signal, and the light source intensity is adjusted by the light source adjustment coefficient, the color cast problem can be improved, and meanwhile, the damage of color saturation presentation can be reduced.
In one embodiment, the calculating of the first average color saturation signal Sn _ ave includes: 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 red sub-pixel average signals rn _ ave, green sub-pixel average signals gn _ ave and blue sub-pixel average signals bn _ ave of all pixels in the current backlight partition corresponding to the current frame; calculating the maximum average signal maxn _ ave and the minimum average signal minn _ ave of the three sub-pixels; calculating a first average color saturation signal Sn _ ave which is 1-minn _ ave/maxn _ ave according to the maximum average signal and the minimum average signal;
wherein R ═ R, (R/255) ^ γ R, G ^ G, (G/255) ^ γ G, B ^ B, (B/255) ^ γ B, where γ R, γ G, γ B are gamma signals of the first color signal;
wherein, R, G, B refer to RGB three primary colors gray scale digital signals corresponding to the first color signal; wherein Max (rn _ ave, gn _ ave, bn _ ave) and Min _ ave (rn _ ave, gn _ ave, bn _ ave) are Max;
wherein rn _ ave ═ Average (rn _1, rn _1,2, …, rn _ i, j); gn _ ave ═ Average (gn _1, gn _1,2, …, gn _ i, j); bn _ ave ═ Average (bn _1, bn _1,2, …, bn _ i, j);
the calculating step of the second average color saturation signal S' n _ ave comprises:
acquiring second color signals R ' n _ i, j, G ' n _ i, j, B ' n _ i, j, converting each group of RGB three primary color sub-pixel gray scale signals into primary color normalized luminance R ', G ', B ', and finishing conversion to obtain second normalized luminance signals R ' n _ i, j, G ' n _ i, j, B ' n _ i, j;
calculating red sub-pixel average signals r ' n _ ave, green sub-pixel average signals g ' n _ ave and blue sub-pixel average signals b ' n _ ave of all pixels in the current backlight partition corresponding to the current frame; calculating the maximum average signal max 'n _ ave and the minimum average signal min' n _ ave of the three sub-pixels; calculating a second average color saturation signal S ' n _ ave-1-min ' n _ ave/max ' n _ ave calculated from the maximum average signal and the minimum average signal;
wherein R '═ R/255 ^ γ R, G' ═ G/255 ^ γ G, B '═ B/255 ^ γ B, where γ' R, γ 'G, γ' B are the gamma signals of the second color signal;
wherein, R ', G ', B ' refer to RGB three primary colors gray scale digital signals corresponding to the second color signal; wherein Max 'n _ ave ═ Max (r' n _ ave, g 'n _ ave, b' n _ ave) and the minimum average signal Min 'n _ ave ═ Min (r' n _ ave, g 'n _ ave, b' n _ ave);
where r 'n _ ave is Average (r' n _1, r 'n _1,2, …, r' n _ i, j), g 'n _ ave is Average (g' n _1, g 'n _1,2, …, g' n _ i, j), b 'n _ ave is Average (b' n _1, b 'n _1,2, …, b' n _ i, j).
In the scheme, all R, G, B sub-pixels in the backlight partition are a group of unit pixels, and are converted into an HSV (Hue, Saturation) system by an RGB system, that is, according to stimulus Value signals Rn _ i, j, Gn _ i, j, Bn _ i, j, a first normalized luminance signal Rn _ i, j, Gn _ i, j, Bn _ i, j is obtained through normalization operation, and a first color space signal is calculated based on the first normalized luminance signal; then, adjusting the color saturation signal of the first color space signal, then based on the adjusted second color space signal, subjecting the second color space signal to a second normalization brightness signal process, and performing inverse conversion to obtain corresponding stimulation functions r ' n _ i, j, g ' n _ i, j, b ' n _ i, j; and calculating a first average color saturation signal and a second average color saturation signal based on the original stimulus functions rn _ i, j, gn _ i, j, bn _ i, j and the new stimulus value signals r ' n _ i, j, g ' n _ i, j, b ' n _ i, j.
In an embodiment, the step of receiving a first color signal corresponding to the display panel and performing color saturation adjustment on the first color signal to obtain a second color signal includes:
receiving a first color signal under an RGB system, and converting the first color signal into a first color space signal under an HSV system;
acquiring a current color saturation signal of the first color space signal and a preset adjusting coefficient corresponding to the current color saturation signal;
carrying out color saturation value reduction processing on the current color saturation signal by using a preset adjustment coefficient; completing adjustment processing of the color saturation signal to obtain and convert a second color space signal under an HSV system according to the second color saturation signal S';
converting the second color space signal into a second color signal under an RGB system;
the preset adjustment coefficient is obtained by calculation according to a preset calculation formula or is obtained by searching through a preset adjustment coefficient lookup table based on the color saturation signal.
In the scheme, under an RGB color system, the higher the color saturation of a signal is, the more serious the color cast is; thus, under the condition of certain color saturation values, the color cast is serious, and under the condition of certain color saturation values, the problem of color cast is not obvious and belongs to an acceptable range; according to the method, a current color saturation signal is obtained, a preset adjusting coefficient corresponding to the current color saturation signal is obtained, and color saturation adjustment is carried out on the color saturation signal, so that the color saturation value is controlled in an area with less serious color cast problem, and the color cast problem 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 one embodiment, the step of converting the first color signal into a first color space signal under the HSV system includes:
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;
converting the first color signal into a first color space signal S ═ 1-mini, j/maxi, j according to the first normalized luminance signal;
carrying out color saturation value reduction processing on the current color saturation signal by using a preset adjustment coefficient; the step of completing the adjustment processing of the color saturation signal to obtain and convert the second color saturation signal S' to obtain a second color space signal under an HSV system comprises the following steps:
under the condition that maxn _ i, j is kept unchanged, adjusting minn _ i, j by using a preset adjusting coefficient H; completing the adjustment processing of the color saturation signal to obtain a second color space signal S' n _ i, j-1-minn _ i, j-H/maxn _ i, j under the HSV system
Where minj, j is min (rn _ i, j, gn _ i, j, bn _ i, j), and maxn _ i, j is max (rn _ i, j, gn _ i, j, bn _ i, j).
In the scheme, 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 adjusted, 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 an embodiment, the step of performing color saturation value reduction processing on the current color saturation signal by using a preset adjustment coefficient includes:
the method comprises the steps of obtaining a current color saturation signal of a first color space signal, detecting whether the current color saturation signal meets a preset color saturation threshold value and whether the current color saturation signal is located in a hue adjusting interval, and if yes, obtaining a corresponding preset adjusting coefficient according to the corresponding color saturation value and the hue adjusting interval based on the color saturation signal.
Wherein, the color saturation threshold value can be 0.5, and if the color saturation threshold value is larger than 0.5, the color saturation threshold value is judged to be satisfied; or may be an interval, such as 0.5-1 (excluding 0.5 and 1), i.e., no color saturation adjustment may be made when the current color saturation is equal to 0.5 or 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 is different between different hue intervals; the higher the color saturation value, the more serious the color shift problem; in addition, the closer to the dominant hue, the more serious the color shift problem, for example, in a hue range corresponding to a blue dominant hue of 240 degrees, the color shift degree of the same color saturation value far exceeds the non-adjusted 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; similarly, the color saturation value is high, but if the hue interval is appropriate, the color shift problem of the corresponding color saturation signal may not be particularly serious and does not need to be adjusted; 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. Wherein: sn _ i, j ═ 1-minj, j/maxn _ i, j; wherein minj, j ═ min (r, g, b); maxn _ i, j ═ max (r, g, b); wherein R ═ R (R/255) ^ γ R, G ═ G (G/255) ^ γ G, B ^ B (B/255) ^ γ B; wherein γ r, γ g, γ b are gamma signals of the first color signal; wherein, R, G, B refer to RGB three primary colors gray scale digital signal corresponding to the first color signal.
In one embodiment, the color saturation signal can be divided into at least a first hue interval, a second hue interval and a third hue interval according to hue differences; in the step of obtaining the preset adjustment coefficient corresponding to the current color saturation signal:
and corresponding to the same tone, the larger the color saturation value of the current color saturation signal is, the larger the adjustment amplitude of the adjustment processing is.
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 S 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 S is the preset adjustment coefficient, the larger the preset adjustment coefficient is, the larger the corresponding adjustment amplitude is.
In one embodiment, the first, second and third hue ranges are red, green and blue hue ranges, respectively;
the adjustment amplitude of the preset adjustment coefficient corresponding to the blue hue interval on the current color saturation signal is larger than the adjustment amplitude of the preset adjustment coefficient corresponding to the red hue interval on the current color saturation signal; the adjustment amplitude of the preset adjustment coefficient corresponding to the red hue interval to the current color saturation signal is larger than the adjustment amplitude of the preset adjustment coefficient corresponding to the green hue interval to the current color saturation signal. In the scheme, the degree of color cast problem is different based on color saturation signals of different hue intervals, under the condition of the same color saturation value, the color cast of a part of the hue intervals is serious, and the color cast of a part of the hue intervals is lighter; under an RGB system, the color cast problem of a color saturation signal in a blue hue interval is the most serious, and the color cast problem of the color saturation signal in a green hue interval is the least serious; in the scheme, for example, S' ═ S × H, the preset adjustment coefficient corresponding to the blue tone interval may be smaller than the preset adjustment coefficient corresponding to the red tone interval, and the preset adjustment coefficient corresponding to the red tone interval may be smaller than the preset adjustment coefficient corresponding to the green tone interval, where the smaller the preset adjustment coefficient is, the larger the adjustment amplitude is; correspondingly, taking S' ═ 1-min × H/max as an example, at this time, the preset adjustment coefficient corresponding to the blue hue interval is the largest and the adjustment amplitude is the largest, and the preset adjustment coefficient corresponding to the green hue interval is the smallest and the adjustment amplitude is the smallest; under the same color saturation value, the color saturation signal in the blue color tone interval has the largest reduction amplitude, and the color saturation signal in the green color tone interval has the smallest reduction amplitude, so that the color cast problem caused by the overlarge color saturation value can be reduced, the color saturation of the color saturation signal is more uniform, the color cast problem can be improved to a certain extent, and the good color cast improvement effect can be achieved.
Fig. 7 is a schematic diagram of a correlation function of a second preset adjustment coefficient H2 according to an embodiment of the present invention, referring to fig. 7 in conjunction with fig. 4 to 6, in an embodiment, the preset adjustment coefficient is used to perform a color saturation value lowering process on the current color saturation signal S; and the step of completing the adjustment processing of the color saturation signal to obtain and convert the second color saturation signal S' to obtain a second color space signal under an HSV system:
calculating to obtain a third color saturation signal S 'according to the current color saturation signal S and the second color saturation signal S';
completing the adjustment of the color saturation value twice, and obtaining a second color space signal under an HSV system based on a third color saturation signal S';
and converting the second color space signal into a second color signal under an RGB system according to the second color space signal to drive the display panel. Specifically, the third color saturation signal S ″ conforms to the following formula: s ═ S- (S-S') -H2; the second preset adjustment coefficient H2 satisfies the following formula:
H2＝2*ABS(sin((Hue/360*3-1/2)*π)-1。
in the scheme, under an RGB system, a 0-degree red pure color tone, a 120-degree green pure color tone and a 240-degree blue pure color tone are defined, and the closer to the pure color tone, the more serious the color cast problem is (under the same color saturation value); based on the second preset adjustment coefficient H2, the closer the color saturation signal of the pure color tone is, the larger amplitude of the secondary adjustment is obtained, and the farther the color saturation signal of the pure color tone is, the smaller amplitude of the secondary adjustment is obtained; therefore, the saturation signal close to the pure color tone can achieve the effect of better improving the color cast problem, and the saturation signal far away from the pure color tone can achieve the effect of reducing the damage of improving the color cast to the whole color saturation, so as to achieve the balance of the color cast and the color saturation and be beneficial to improving the display effect of the display panel.
In the stage of color saturation adjustment:
fig. 8 is a schematic diagram illustrating changes in the current color saturation signal and the second color saturation signal according to an embodiment of the present invention, fig. 9 is a graph illustrating a color difference change of the front viewing angle of the current color saturation signal and the second color saturation signal according to an embodiment of the present invention, and fig. 10 is a schematic diagram illustrating a color difference change of the side viewing angle of 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. 9 may be in the case of a front view angle.
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. 11 is a diagram of a driving system of a display panel according to the present invention, and FIG. 12 is a diagram of a driving circuit of a display panel according to an embodiment of the present invention; FIG. 13 is a schematic diagram of a driving circuit of a backlight module according to an embodiment of the invention; referring to fig. 11-13, in conjunction with fig. 1-9, it can be seen that: the invention also discloses a driving system 100 of the display module, comprising:
a display panel driving circuit 110 and a backlight module driving circuit 120 which are synchronously driven;
the display module comprises a plurality of independently controlled first color light sources 130 and second color light sources 140; the display panel driving circuit 110 includes:
the color saturation adjusting module 111, namely a color saturation adjusting circuit, is configured to receive a first color signal corresponding to the display panel, and perform color saturation adjustment on the first color signal to obtain a second color signal; a display panel driving module 112, i.e., a display panel driving circuit, for driving the display panel using the second color signal;
the backlight module driving circuit 120 includes:
the light source adjustment calculating module 121, namely a light source adjustment calculating module, is configured to receive a first color signal corresponding to the display panel, obtain a second color signal, and obtain a light source adjustment coefficient according to the first color signal and the second color signal;
the light source adjusting module 122, namely a light source adjusting module, is configured to adjust a first luminance value corresponding to the first color light source and/or the second color light source by using the light source adjusting coefficient to obtain a second luminance value; the backlight module driving module 123, i.e., a backlight module driving circuit, is configured to drive the first color light source and/or the second color light source by using the second luminance value.
Fig. 14 is a schematic view of a display device according to the present invention, and referring to fig. 14, it can be known from fig. 1 to fig. 13 that: the invention also discloses a display device 200 comprising the driving system 100 of the display module.
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 driving method of a display module is characterized by comprising a display panel driving process and a backlight module driving process which are synchronously driven:
the display module comprises a plurality of independently controlled first color light sources and second color light sources;
the display panel driving process includes the steps of:
receiving a first color signal corresponding to the display panel, and performing color saturation adjustment on the first color signal to obtain a second color signal;
driving the display panel using the second color signal;
the backlight module driving process comprises the following steps:
receiving a first color signal corresponding to a display panel, obtaining a second color signal, obtaining the first color signal and the second color signal of all pixels in a current backlight partition corresponding to a current frame, and respectively calculating a first average color saturation signal Sn _ ave corresponding to the first color signal and a second average color saturation signal S' n _ ave corresponding to the second color signal;
calculating to obtain a light source adjustment coefficient according to the first average color saturation signal Sn _ ave and the second average color saturation signal S' n _ ave;
adjusting a first brightness value corresponding to the first color light source and/or the second color light source by using the light source adjustment coefficient to obtain a second brightness value;
the first color light source and/or the second color light source are driven using the second luminance value.
2. The method according to claim 1, wherein the display module is a direct-type backlight display module, the direct-type backlight display module comprises a plurality of backlight partitions, each of the backlight partitions comprises a plurality of independently controlled light sources of the first color and a plurality of independently controlled light sources of the second color;
the backlight partition further includes a plurality of independently controlled third color light sources.
3. The method as claimed in claim 1, wherein the first color signal is RGB three primary color signal under RGB system, the first color signal comprises red sub-pixel signal, green sub-pixel signal and blue sub-pixel signal;
the step of obtaining the light source adjustment coefficient according to the first color signal and the second color signal comprises:
acquiring first color signals of all pixels in a current backlight partition corresponding to a current frame, and calculating a maximum average signal maxn _ ave and a minimum average signal minn _ ave in corresponding red sub-pixel average signals, green sub-pixel average signals and blue sub-pixel average signals;
obtaining a first average color saturation signal Sn _ ave which is calculated according to the maximum average signal and the minimum average signal and is 1-minn _ ave/maxn _ ave;
calculating a maximum average signal max 'n _ ave and a minimum average signal min' n _ ave of the second color signal;
obtaining a second average color saturation signal S ' n _ ave which is 1-min ' n _ ave/max ' n _ ave calculated according to the maximum average signal and the minimum average signal;
calculating the light source adjustment coefficient y according to the first average color saturation signal and the second average color saturation signal, so that the light source adjustment coefficient y satisfies the following formula:
sn _ ave ═ 1-minjn _ ave/maxn _ ave ═ 1-min 'n _ ave/(max' n _ ave ×), i.e., y ═ min 'n _ ave × maxn _ ave)/(minn _ ave × max' n _ ave).
4. The method as claimed in claim 1, wherein the first color signal is RGB three primary color signal under RGB system, the first color signal comprises red sub-pixel signal, green sub-pixel signal and blue sub-pixel signal;
the step of obtaining the light source adjustment coefficient according to the first color signal and the second color signal comprises:
acquiring first color signals of all pixels in a current backlight partition corresponding to a current frame, and calculating a maximum average signal maxn _ ave and a minimum average signal minn _ ave in corresponding red sub-pixel average signals, green sub-pixel average signals and blue sub-pixel average signals;
obtaining a first average color saturation signal Sn _ ave which is calculated according to the maximum average signal and the minimum average signal and is 1-minn _ ave/maxn _ ave;
calculating a maximum average signal max 'n _ ave and a minimum average signal min' n _ ave of the second color signal;
obtaining a second average color saturation signal S ' n _ ave which is 1-min ' n _ ave/max ' n _ ave calculated according to the maximum average signal and the minimum average signal;
calculating the light source adjustment coefficient y according to the first average color saturation signal and the second average color saturation signal, so that the light source adjustment coefficient y satisfies the following formula:
Sn_ave＝1-minn_ave/maxn_ave＝1-(min’n_ave/max’n_ave)*y
that is, y is (minn _ ave × max 'n _ ave)/(min' n _ ave × maxn _ ave).
5. The method for driving a display module according to claim 1, wherein the step of calculating the first average color saturation signal Sn _ ave comprises:
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 red sub-pixel average signals rn _ ave, green sub-pixel average signals gn _ ave and blue sub-pixel average signals bn _ ave of all pixels in the current backlight partition corresponding to the current frame;
calculating the maximum average signal maxn _ ave and the minimum average signal minn _ ave of the three sub-pixels;
calculating a first average color saturation signal Sn _ ave which is 1-minn _ ave/maxn _ ave according to the maximum average signal and the minimum average signal;
wherein R ═ R, (R/255) ^ γ R, G ^ G, (G/255) ^ γ G, B ^ B, (B/255) ^ γ B, where γ R, γ G, γ B are gamma signals of the first color signal;
wherein, R, G, B refer to RGB three primary colors gray scale digital signals corresponding to the first color signal;
wherein Max (rn _ ave, gn _ ave, bn _ ave) and Min _ ave (rn _ ave, gn _ ave, bn _ ave) are Max;
wherein rn _ ave ═ Average (rn _1, rn _1,2, …, rn _ i, j); gn _ ave ═ Average (gn _1, gn _1,2, …, gn _ i, j); bn _ ave ═ Average (bn _1, bn _1,2, …, bn _ i, j);
the calculating step of the second average color saturation signal S' n _ ave comprises:
acquiring second color signals R ' n _ i, j, G ' n _ i, j, B ' n _ i, j, converting each group of RGB three primary color sub-pixel gray scale signals into primary color normalized luminance R ', G ', B ', and finishing conversion to obtain second normalized luminance signals R ' n _ i, j, G ' n _ i, j, B ' n _ i, j;
calculating red sub-pixel average signals r ' n _ ave, green sub-pixel average signals g ' n _ ave and blue sub-pixel average signals b ' n _ ave of all pixels in the current backlight partition corresponding to the current frame;
calculating the maximum average signal max 'n _ ave and the minimum average signal min' n _ ave of the three sub-pixels;
calculating a second average color saturation signal S ' n _ ave-1-min ' n _ ave/max ' n _ ave calculated from the maximum average signal and the minimum average signal;
wherein R '═ R/255 ^ γ R, G' ═ G/255 ^ γ G, B '═ B/255 ^ γ B, where γ' R, γ 'G, γ' B are the gamma signals of the second color signal;
wherein, R ', G ', B ' refer to RGB three primary colors gray scale digital signals corresponding to the second color signal;
wherein Max 'n _ ave ═ Max (r' n _ ave, g 'n _ ave, b' n _ ave) and the minimum average signal Min 'n _ ave ═ Min (r' n _ ave, g 'n _ ave, b' n _ ave);
where r 'n _ ave is Average (r' n _1, r 'n _1,2, …, r' n _ i, j), g 'n _ ave is Average (g' n _1, g 'n _1,2, …, g' n _ i, j), b 'n _ ave is Average (b' n _1, b 'n _1,2, …, b' n _ i, j).
6. The method as claimed in claim 1, wherein the step of receiving a first color signal corresponding to the display panel and performing color saturation adjustment on the first color signal to obtain a second color signal comprises:
receiving a first color signal under an RGB system, and converting the first color signal into a first color space signal under an HSV system;
acquiring a current color saturation signal of the first color space signal and a preset adjusting coefficient corresponding to the current color saturation signal;
carrying out color saturation value reduction processing on the current color saturation signal by using a preset adjustment coefficient; completing adjustment processing of the color saturation signal to obtain and convert a second color space signal under an HSV system according to the second color saturation signal S';
converting the second color space signal into a second color signal under an RGB system;
the preset adjustment coefficient is obtained by calculation according to a preset calculation formula or is obtained by searching through a preset adjustment coefficient lookup table based on a color saturation signal;
the step of using the preset adjustment coefficient to carry out color saturation value adjustment reduction processing on the current color saturation signal comprises the following steps:
the method comprises the steps of obtaining a current color saturation signal of a first color space signal, detecting whether the current color saturation signal meets a preset color saturation threshold value and whether the current color saturation signal is located in a hue adjusting interval, and if yes, obtaining a corresponding preset adjusting coefficient according to the corresponding color saturation value and the hue adjusting interval based on the color saturation signal.
7. The method as claimed in claim 6, wherein the step of converting the first color signal into a first color space signal under HSV system comprises:
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;
converting the first color signal into a first color space signal Sn _ i, j ═ 1-minjn _ i, j/maxn _ i, j according to the first normalized luminance signal;
carrying out color saturation value reduction processing on the current color saturation signal by using a preset adjustment coefficient; the step of completing the adjustment processing of the color saturation signal to obtain and convert the second color saturation signal S' to obtain a second color space signal under an HSV system comprises the following steps:
under the condition that maxn _ i, j is kept unchanged, adjusting minn _ i, j by using a preset adjusting coefficient H;
completing adjustment processing of the color saturation signal to obtain a second color space signal S' n _ i, j-1-minn _ i, j-H/maxn _ i, j under an HSV system;
where minj, j is min (rn _ i, j, gn _ i, j, bn _ i, j), and maxn _ i, j is max (rn _ i, j, gn _ i, j, bn _ i, j).
8. A driving system of a display module using the driving method of the display module according to any one of claims 1 to 7, comprising:
a display panel driving circuit and a backlight module driving circuit which are driven synchronously;
the display module comprises a plurality of independently controlled first color light sources and second color light sources;
the display panel driving circuit includes:
the color saturation adjusting module is used for receiving a first color signal corresponding to the display panel and adjusting the color saturation of the first color signal to obtain a second color signal;
the display panel driving module is used for driving the display panel by using the second color signal;
the backlight module driving circuit includes:
the light source adjustment calculation module is used for receiving a first color signal corresponding to the display panel, obtaining a second color signal, obtaining a first color signal and a second color signal of all pixels in a current backlight partition corresponding to a current frame, and calculating a first average color saturation signal Sn _ ave corresponding to the first color signal and a second average color saturation signal S' n _ ave corresponding to the second color signal respectively;
calculating to obtain a light source adjustment coefficient according to the first average color saturation signal Sn _ ave and the second average color saturation signal S' n _ ave;
the light source adjusting module is used for adjusting a first brightness value corresponding to the first color light source and/or the second color light source by using a light source adjusting coefficient to obtain a second brightness value;
and the backlight module driving module is used for driving the first color light source and/or the second color light source by using the second brightness value.
9. A display device comprising the driving system of the display module according to claim 8.
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