CN110111744B - 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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- CN110111744B CN110111744B CN201910275200.0A CN201910275200A CN110111744B CN 110111744 B CN110111744 B CN 110111744B CN 201910275200 A CN201910275200 A CN 201910275200A CN 110111744 B CN110111744 B CN 110111744B
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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
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0613—The adjustment depending on the type of the information to be displayed
- G09G2320/062—Adjustment of illumination source parameters
Abstract
The application discloses display module's drive method, actuating system and display device, including the drive process of synchronous drive's display panel, and backlight unit's drive process: the display panel comprises a first color light source, a second color light source and a third color light source; the driving process of the display panel includes: converting the first color signal into a first hue saturation brightness space signal after receiving the first color signal; adjusting the first color saturation signal to obtain a second color saturation signal; driving the display panel by using the second color signal converted from the second color saturation signal; the driving process of the backlight module comprises the following steps: receiving a first color signal, obtaining a first color saturation signal and a second color saturation signal, and obtaining a light source adjustment coefficient; determining a minimum color light source, and adjusting the minimum color light source by using a light source adjustment coefficient to obtain a fourth brightness value; driving a minimum color light source using a fourth luminance value; the present application maintains color purity while ameliorating the problem of color shift.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a driving method, a driving system, and a display device for a display 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 lcds are Backlight 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 application aims to provide a driving method, a driving system and a display device of a display module, which can reduce color cast and maintain color purity expression.
The application discloses a driving method of a display module, which comprises a driving process of a display panel which is driven synchronously and a driving process of a backlight module:
the backlight module comprises a plurality of independently controlled first color light sources, second color light sources and third color light sources; the light source brightness corresponding to the first color light source is a first brightness value, the light source brightness corresponding to the second color light source is a second brightness value, and the light source brightness corresponding to the third color light source is a third brightness value;
the driving process of the display panel comprises the following steps:
receiving a first color signal corresponding to a display panel, converting the first color signal into a first brightness normalization signal, and converting the first brightness normalization signal into a first hue saturation brightness space signal;
adjusting a first color saturation signal of the first color saturation brightness space signal by using a preset adjustment coefficient to obtain a second color saturation signal;
converting the second color saturation signal into a second color signal;
driving the display panel using the second color signal;
the driving process of the backlight module comprises the following steps:
receiving a first color signal corresponding to a display panel, and obtaining a first color saturation signal and a second color saturation signal;
determining a minimum color light source in the first color light source, the second color light source and the third color light source, and acquiring a light source adjustment coefficient corresponding to the minimum color light source according to the first color saturation signal and the second color saturation signal;
the minimum color light source is driven using the fourth luminance value.
A scheme for improving the color shift problem relative to dividing the pixels of the display panel into primary and secondary pixels; the exemplary technology is that the first color saturation is adjusted, the obtained second color saturation is correspondingly converted into a second color signal, the second color signal is applied to drive the display panel, and the color cast problem can be well improved; however, the color saturation value is adjusted, so that the image quality saturation is lost; according to the color saturation adjusting method and device, the light source adjusting coefficient is obtained according to the first color saturation signal and the second color saturation signal to adjust the brightness of the light source for the minimum color light source, the hue of the color subjected to color saturation loss is improved, the adjusted light source intensity is used as an auxiliary, even the adjusted color point can return to the original saturated color point, and the color purity performance is maintained while the color cast of the visual angle is reduced.
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 schematic structural diagram of a display device according to an embodiment of the present application;
FIG. 5 is a schematic structural diagram of a driving system of a display module according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a driving circuit of a display panel according to an embodiment of the present disclosure;
FIG. 7 is a schematic structural diagram of a driving circuit of a backlight module according to an embodiment of the present disclosure;
FIG. 8 is a flowchart illustrating a driving method of a display module according to an embodiment of the present disclosure;
FIG. 9 is a flowchart illustrating a driving method of a display module according to another embodiment of the present disclosure;
FIG. 10 is a schematic view of a direct type display module according to an embodiment of the present disclosure;
FIG. 11 is a schematic illustration of a tonal representation according to an embodiment of the present application;
FIG. 12 is a schematic illustration of a color saturation signal and a second color saturation signal variation of an embodiment of the present application;
FIG. 13 is a schematic illustration of a color saturation signal and a second color saturation signal variation for another embodiment of the present application;
FIG. 14 is a schematic diagram of a variation of a color difference between a color saturation signal and a second color saturation signal of an embodiment of the present application;
FIG. 15 is a schematic diagram of a variation of color difference for different colors of a color saturation signal and a second color saturation signal of another embodiment of the present application.
100, a driving system of the display module; 200. a display module; 300. a display device; 110. a drive circuit of the display panel; 120. a driving circuit of the backlight module; 111. a receiving module; 112. an adjustment module; 113. a conversion module; 114. a drive module; 121. a light source calculation module; 122. a light source determination module; 123. a light source adjusting module; 124. and a light source driving module.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.
Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The large-sized liquid crystal display panel mostly adopts a negative VA (Vertical Alignment) liquid crystal or IPS (In-plane Switch) liquid crystal technology, and the VA liquid crystal technology has the advantages of higher production efficiency and lower manufacturing cost compared with the IPS liquid crystal technology, but the VA liquid crystal technology has obvious optical property defects compared with the IPS liquid crystal technology In terms of optical properties, and particularly the large-sized panel needs a larger viewing angle In terms of commercial application.
FIG. 1 is a schematic diagram of color shift variation of large viewing angle and front viewing angle of various representative color systems in a liquid crystal display panel; as shown in fig. 1, when the hue is close to the pure R (red), G (green), and B (blue), the color shift deterioration observed at the viewing angle is more remarkable, and when the hue is close to R, G, B, the color shift phenomenon becomes more remarkable because R, G, B pure hue has other color components.
An exemplary solution is to subdivide the RGB Sub-pixels into primary and secondary (Main/Sub) pixels so that the overall large-view luminance is closer to front view as the voltage varies. 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 x, y and z coordinates represent three directions of a three-dimensional space, respectively; θ a denotes the pretilt angle at which the main pixel has a large voltage, and θ B denotes 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.
The ratio of brightness change corresponding to high-voltage side-view angle voltage in the liquid crystal display is easier to be saturated, so that an original signal can be divided into a large voltage and a small voltage to be seen as a graph shown in figure 3, the front-view large voltage and the small voltage are used for maintaining 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 a Part A in figure 3, the side-view brightness seen by the small voltage changes along with the gray scale as a Part B in figure 3, and thus the brightness seen by the side-view synthesis is closer to the relation that the front-view brightness changes along with the gray scale, so that the relation of the visual angle brightness along with the signal changes is close to the.
The defect of color shift of viewing angle is solved by applying different driving voltages to the main and sub-pixels in space, so that the design of the pixel 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 a light-permeable opening area, influences the penetration rate of a panel, and directly causes the improvement of the backlight cost.
The present application is described in detail below with reference to the figures and alternative embodiments.
As shown in fig. 4, the present application discloses a display device 300, which includes a driving system 100 of a display module and a display module 200.
As shown in fig. 5, 6 and 7, the present application further discloses a driving system 100 of a display module, and a driving method of a display module, which is described below, applied to the driving system 100 of the display module disclosed in the present application; the driving system 100 of the display module includes: the driving circuit 110 of the display panel and the driving circuit 120 of the backlight module, which are synchronously driven:
the backlight module comprises a plurality of independently controlled first color light sources, second color light sources and third color light sources; the light source brightness corresponding to the first color light source is a first brightness value, the light source brightness corresponding to the second color light source is a second brightness value, and the light source brightness corresponding to the third color light source is a third brightness value;
the driving circuit 110 of the display panel includes a receiving module 111, an adjusting module 112, a converting module 113, and a driving module 114; the receiving module 111 receives a first color signal corresponding to the display panel, converts the first color signal into a first brightness normalization signal, and converts the first brightness normalization signal into a first hue saturation brightness space signal; the adjusting module 112 adjusts the first color saturation signal of the first color saturation luminance spatial signal by presetting an adjusting coefficient to obtain a second color saturation signal; the conversion module 113 converts the second color saturation signal into a second color signal; the driving module 114 drives the display panel using the second color signal;
the driving circuit 120 of the backlight module comprises a light source calculating module 121, a light source determining module 122, a light source adjusting module 123 and a light source driving module 124; the light source calculating module 121 receives a first color signal corresponding to the display panel, and obtains a first color saturation signal and a second color saturation signal; the light source determining module 122 determines a minimum color light source among the first color light source, the second color light source, and the third color light source, and obtains a light source adjustment coefficient corresponding to the minimum color light source according to the first color saturation signal and the second color saturation signal; the light source adjusting module 123 adjusts the minimum color light source by using the light source adjusting coefficient to obtain a fourth brightness value; the light source driving module 124 drives the minimum color light source using the fourth luminance value.
As shown in fig. 8 and 9, the present application further 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 backlight module comprises a plurality of independently controlled first color light sources, second color light sources and third color light sources; the light source brightness corresponding to the first color light source is a first brightness value, the light source brightness corresponding to the second color light source is a second brightness value, and the light source brightness corresponding to the third color light source is a third brightness value;
the driving process of the display panel includes the steps of:
s11: receiving a first color signal corresponding to a display panel, converting the first color signal into a first brightness normalization signal, and converting the first brightness normalization signal into a first hue saturation brightness (HSV) space signal;
s12: adjusting a first color saturation signal of the first color saturation brightness space signal by using a preset adjustment coefficient to obtain a second color saturation signal;
s13: converting the second color saturation signal into a second color signal;
s14: driving the display panel using the second color signal;
the driving process of the backlight module comprises the following steps:
s21: receiving a first color signal corresponding to a display panel, and obtaining a first color saturation signal and a second color saturation signal;
s22: determining a minimum color light source in the first color light source, the second color light source and the third color light source, and acquiring a light source adjustment coefficient corresponding to the minimum color light source according to the first color saturation signal and the second color saturation signal;
s23: adjusting the minimum color light source by using the light source adjustment coefficient to obtain a fourth brightness value;
s24: the minimum color light source is driven using the fourth luminance value.
A scheme for improving the color shift problem relative to dividing the pixels of the display panel into primary and secondary pixels; the exemplary technology is that the first color saturation is adjusted, the obtained second color saturation is correspondingly converted into a second color signal, the second color signal is applied to drive the display panel, and the color cast problem can be well improved; however, the color saturation value is adjusted, so that the image quality saturation is lost; the method and the device for adjusting the brightness of the light source adjust the brightness of the minimum color light source by obtaining the light source adjusting coefficient according to the first color saturation signal and the second color saturation signal, improve the hue of the color subjected to color saturation loss, and even enable the adjusted color point to return to the original saturated color point by the aid of the adjusted light source intensity, so that the color purity performance is maintained while the color cast of the visual angle is reduced, wherein the color signals can be three primary color signals of red, green and blue. The specific first color signal may be a first rgb signal, and the second color signal may be a second rgb signal.
The step of adjusting the first color saturation signal of the first color hue saturation brightness space signal by using a preset adjustment coefficient to obtain a second color saturation signal comprises the following steps:
the second color saturation signal S' n _ i, j is obtained from the first color saturation signal Sn _ i, j by the following formula:
S’n_i,j＝a×S4n_i,j+b×S3n_i,j+c×S2n_i,j+d×Sn_i,j+e；
wherein a, b, c, d and e are preset adjustment coefficients;
the step of converting the second color saturation signal into a second color signal comprises: converting the second color saturation signal to obtain a second color hue saturation brightness space signal, and reducing the minimum value in the brightness normalization signal according to the second color hue saturation brightness space signal to obtain a second brightness normalization signal;
and converting the second brightness normalization signal to obtain a second color signal.
The step of determining a minimum color light source among the first color light source, the second color light source, and the third color light source, and obtaining a light source adjustment coefficient corresponding to the minimum color light source according to the first color saturation signal and the second color saturation signal further includes: determining a second largest color light source and a smallest color light source of the first color light source, the second color light source, and the third color light source; acquiring a light source adjustment coefficient corresponding to a minimum color light source and a light source adjustment coefficient corresponding to a second largest color light source according to the first color saturation signal and the second color saturation signal;
adjusting the minimum color light source by using the light source adjustment coefficient to obtain a fourth brightness value; the driving of the minimum-color light source using the fourth luminance value includes: adjusting the minimum color light source by using the light source adjustment coefficient corresponding to the minimum color light source to obtain a fourth brightness value, and adjusting the secondary large color light source by using the light source adjustment coefficient corresponding to the secondary large color light source to obtain a fifth brightness value; the minimum color light source is driven using the fourth luminance value and the second largest color light source is driven using the fifth luminance value.
According to the color enhancement method and device, the fourth brightness value is used for driving the minimum color light source, the fifth brightness value is used for driving the second largest color light source, the minimum color light source and the second largest color light source can both achieve enhancement of the tone which is not enough in corresponding display, the original saturated color point is returned, and the color purity of the tone corresponding to the minimum color light source and the second largest color light source is maintained.
In addition, the step of determining a minimum color light source among the first color light source, the second color light source, and the third color light source, and obtaining a light source adjustment coefficient corresponding to the minimum color light source according to the first color saturation signal and the second color saturation signal further includes: determining a largest color light source, a second largest color light source, and a smallest color light source of the first, second, and third color light sources; acquiring a light source adjustment coefficient corresponding to the maximum color light source, a light source adjustment coefficient corresponding to the second largest color light source and a light source adjustment coefficient corresponding to the minimum color light source according to the first color saturation signal and the second color saturation signal;
adjusting the minimum color light source by using the light source adjustment coefficient to obtain a fourth brightness value; the driving of the minimum-color light source using the fourth luminance value includes: adjusting the minimum color light source by using the light source adjustment coefficient corresponding to the minimum color light source to obtain a fourth brightness value; adjusting the secondary large color light source by using the light source adjustment coefficient corresponding to the secondary large color light source to obtain a fifth brightness value; adjusting the maximum color light source by using the light source adjustment coefficient corresponding to the maximum color light source to obtain a sixth brightness value; driving the minimum color light source using the fourth luminance value; driving the second largest color light source with a fifth luminance value; the maximum color light source is driven using the sixth luminance value.
And driving the minimum color light source by using the fourth brightness value, driving the secondary large color light source by using the fifth brightness value, and driving the maximum color light source by using the sixth brightness value, so that the minimum color light source, the secondary large color light source and the maximum color light source can strengthen the tone which is not displayed enough correspondingly, the tone returns to the original saturated color point, and the color purity of the tone corresponding to the minimum color light source, the secondary large color light source and the maximum color light source is maintained.
The step of determining the minimum color light source among the first color light source, the second color light source and the third color light source, and acquiring the light source adjustment coefficient corresponding to the minimum color light source according to the first color saturation signal and the second color saturation signal includes:
acquiring a first brightness normalization signal corresponding to the first color saturation signal, and respectively calculating to obtain an average signal of the first red brightness normalization signal, a first maximum signal, a first secondary maximum signal and a first minimum signal in the average signal of the first green brightness normalization signal and the average signal of the first blue brightness normalization signal:
acquiring a second brightness normalization signal corresponding to the second color saturation signal, and respectively calculating an average value of all the obtained second red brightness normalization signals corresponding to the backlight subareas, and a second maximum signal, a second secondary maximum signal and a second minimum signal in the average values of the second green brightness normalization signals and the second blue brightness normalization signals;
acquiring a first light source adjustment coefficient corresponding to the minimum color light source according to the first minimum signal and the second minimum signal;
acquiring a second light source adjustment coefficient corresponding to the secondary large color light source according to the first large signal and the second large signal;
the backlight module is a direct type backlight;
the direct type backlight is divided into a plurality of backlight subareas, and each backlight subarea is provided with a red light source, a green light source and a blue light source which are independent;
the first luminance normalization signal comprises a first red luminance normalization signal, a first green luminance normalization signal and a first blue luminance normalization signal;
the second luminance normalization signal includes a second red luminance normalization signal, a second green luminance normalization signal, and a second blue luminance normalization signal.
By comparing a first maximum signal, a first large signal and a first minimum signal in average signals of red, green and blue hues corresponding to a first color saturation signal and a second maximum signal, a second large signal and a second minimum signal in average signals of red, green and blue hues corresponding to a second color saturation signal (a signal obtained by adjusting the first color saturation signal), a first light source adjustment coefficient and a second light source adjustment coefficient are obtained, the aim of adjusting the light source is realized, so that the light source can accurately adjust the descending amplitude according to the first minimum signal and the first large signal and correspondingly supplement the intensity of the light source, and the aim of balancing can be achieved even after the color saturation is adjusted; the color point can return to the original saturated color point by the aid of the light source, and the color purity performance is maintained while the color cast of the display panel is reduced.
The relationship among the first maximum signal maxn _ ave, the first secondary maximum signal midn _ ave, the first minimum signal minn _ ave, the average signal rn _ ave of the first red luminance normalization signal, the average signal gn _ ave of the first green luminance normalization signal, and the average signal bn _ ave of the first blue luminance normalization signal satisfies the following formula: max (rn _ ave, gn _ ave, bn _ ave); mid _ ave ═ Mid (rn _ ave, gn _ ave, bn _ ave); minjve ═ Min (rn _ ave, gn _ ave, bn _ ave);
the relationship of the second maximum signal max 'n _ ave, the first secondary maximum signal mid' n _ ave, the first minimum signal min 'n _ ave, the average signal of the first red luminance normalization signal r' n _ ave, the average signal of the first green luminance normalization signal g 'n _ ave, and the average signal of the first blue luminance normalization signal b' n _ ave satisfies the following equation: max 'n _ ave ═ Max (r' n _ ave, g 'n _ ave, b' n _ ave); mid 'n _ ave ═ Mid (r' n _ ave, g 'n _ ave, b' n _ ave); min 'n _ ave ═ Min (r' n _ ave, g 'n _ ave, b' n _ ave). The first maximum signal maxn _ ave, the first secondary large signal midn _ ave, the first minimum signal minn _ ave, the second maximum signal max ' n _ ave, the first secondary large signal mid ' n _ ave and the first minimum signal min ' n _ ave are all obtained through calculation, and accuracy of light source adjustment of the light source adjusting device is improved.
Fig. 10 is a schematic diagram of a direct-type display module according to an embodiment of the present disclosure, and as shown in fig. 10, first red luminance normalization signals corresponding to backlight partitions respectively are: rn _1, rn _1,2, …, rn _ i, j, the first green luminance normalization signals corresponding to the backlight partitions are: gn _1, gn _1,2, …, gn _ i, j, and the first blue luminance normalization signal corresponding to the backlight partition are: bn _1, bn _1,2, …, bn _ i, j, the average signal rn _ ave of the first red luminance normalization signal, the average signal gn _ ave of the first green luminance normalization signal, and the average signal bn _ ave of the first blue luminance normalization signal satisfy the following formula: rn _ ave ═ Average (rn _1, rn _1,2, …, rn _ i, j);
gn_ave＝Average(gn_1,1、gn_1,2、…、gn_i,j)；
bn_ave＝Average(bn_1,1、bn_1,2、…、bn_i,j)；
the second red brightness normalization signals corresponding to the backlight partitions are respectively as follows: r 'n _1, r' n _1,2, …, r 'n _ i, j, the second green luminance normalized signal corresponding to the backlight partition is g' n _1, g 'n _1,2, …, g' n _ i, j, the second blue luminance normalized signal corresponding to the backlight partition is b 'n _1, b' n _1,2, …, b 'n _ i, j, the average signal of the second red luminance normalized signal r' n _ ave, the average signal of the second green luminance normalized signal g 'n _ ave, and the average signal of the second blue luminance normalized signal b' n _ ave satisfy the following formula:
r’n_ave＝Average(r’n_1,1、r’n_1,2、…、r’n_i,j)；
g’n_ave＝Average(g’n_1,1、g’n_1,2、…、g’n_i,j)；
b’n_ave＝Average(b’n_1,1、b’n_1,2、…、b’n_i,j)。
the average signal of the first red brightness normalization signal, the average signal of the first green brightness normalization signal, the average signal of the first blue brightness normalization signal, the average signal of the second red brightness normalization signal, the average signal of the second green brightness normalization signal and the average signal of the second blue brightness normalization signal are respectively obtained through calculation of the red, green and blue brightness normalization signals before and after each adjustment.
In addition, for example, when the hue calculated by the first luminance normalization signal satisfies: 0< Hn _ i, j <30 (i.e. with red as the dominant hue), the first large luminance normalized signal and the first minimum luminance normalized signal are maintained, with a fixed luminance difference of gn _ i, j-bn _ i, j-g 'n _ i, j-b' n _ i, j.
If the first light source adjustment coefficient is x and the second light source adjustment coefficient is y, the following formula is satisfied: midn _ ave ═ x × mid 'n _ ave, minn _ ave ═ y × min' n _ ave. And the signal change proportion is obtained through the calculation of a formula, so that the proportion of the light source to be adjusted can be correspondingly calculated. In addition, according to the present application, a third light source adjustment coefficient corresponding to the maximum color light source may be obtained according to the first maximum signal and the second maximum signal, and if the third light source adjustment coefficient is z, the following may be satisfied: maxn _ ave ═ x × max' n _ ave.
In the driving process of the display panel, the step of receiving a first color signal corresponding to the display panel, converting the first color signal into a first brightness normalization signal, and converting the first brightness normalization signal into a first hue saturation brightness space signal comprises: the input signal of the first color signal is 8-bit gray scale digital signal of 0,1, … 255, each gray scale signal corresponds to 255 input first brightness normalization signal (taking 255 gray scale as maximum brightness) and is r, g, b respectively; wherein the content of the first and second substances,
r ═ R (R/255) ^ γ R, G ═ G/255 ^ γ G, B ^ B (B/255); gamma r, gamma g, gamma b are gamma signals;
as shown in fig. 11, H is a color representation, and represents different hue color presentations by 0 ° to 360 °, where 0 ° is defined as red, 120 ° as green, and 240 ° as blue;
the formula for converting the luminance normalized signals r, g, b into the hue h and saturation signal s is as follows:
wherein max represents the maximum value of r/g/b, and min represents the minimum value of r/g/b.
Fig. 12 is a schematic diagram of a change of a color saturation signal and a second color saturation signal, and as shown in fig. 12, the step of adjusting the first color saturation signal Sn _ i, j of the first color saturation luminance spatial signal by using a preset adjustment coefficient to obtain the second color saturation signal S' n _ i, j includes: the second color saturation signal S' n _ i, j is obtained from the first color saturation signal Sn _ i, j by the following formula:
S’n_i,j＝a×S4n_i,j+b×S3n_i,j+c×S2n_i,j+d×Sn_i,j+e，
wherein a, b, c, d and e are preset adjusting coefficients which are constants; a, b, c, d and e can be adjusted according to actual needs.
The step of converting the second color saturation signal into a second color signal comprises: converting the second color saturation signal to obtain a second color hue saturation brightness space signal, and reducing the minimum value in the brightness normalization signal according to the second color hue saturation brightness space signal to obtain a second brightness normalization signal;
and converting the second brightness normalization signal to obtain a second color signal.
In one embodiment, the present application may also divide the hue H into m hue intervals; fig. 13 is a schematic diagram of a color saturation signal and a change of the second color saturation signal in the present embodiment, and as shown in fig. 13, preset adjustment coefficients a (h) (m), b (h (m)), c (h (m)), d (h (m)), and e (h (m)) are obtained according to the hue interval; wherein, the more serious the color cast, the larger the adjustment coefficient; the color saturation signal S and a second color saturation signal S' (h (m), S) corresponding to the hue interval satisfy the following formula:
S'(H(m),S)＝a(H(m))×S4+b(H(m))×S3+c(H(m))×S2+d(H(m))×S+e(H(m))
wherein a (H), (m), b (H), (m), c (H), (m), d (H), (m), e (H (m)) are the adjustment constants of hue interval to saturation.
Divide tone (H) into a plurality of intervals, the interval of difference, the colour cast degree is different, adopts different adjustment to the colour saturation according to the interval of difference to when making display panel's color vividness promote, the adjustment of colour cast is more even.
The step of converting the second color saturation signal into a second color signal comprises: converting the second color saturation signal S ' n _ i, j to obtain a second brightness normalization signal, and converting the second brightness normalization signal R ', G ', B ' to obtain a second color signal R ', G ', B ' by the following formula:
R’＝255×(r’)1/γr、G’＝255×(g’)1/γg、B’＝255×(b’)1/γb。
while the display panel is driven using the second three primary colors of red, green and blue, the minimum color light source is driven using the fourth luminance value, and the second largest color light source is driven using the fifth luminance value.
FIG. 14 is a schematic diagram of a variation of color difference between a color saturation signal and a second color saturation signal; FIG. 15 is a schematic diagram of a variation of color differences for different colors of a color saturation signal and a second color saturation signal; in summary, the color mixture component is reduced, and the color purity of the dominant hue is increased, so that the color purity of the signal is improved, and the improvement of the color cast is facilitated.
In addition, also taking red as an example, in a red solid tone, red is a dominant tone; the color saturation taking red as a main hue can be reduced by increasing the minimum brightness normalization signal in the brightness normalization signals of other colors in the red pure hue; the color mixing can be close to white neutral color, and the color deviation of the neutral color can be reduced mainly because the red, green and blue three primary colors leak light, so that the light leakage color mixing of the three primary colors can not generate color, namely the light leakage color of the front side view is the neutral color.
It should be noted that, the limitations of each step 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 the steps should be considered as belonging to the protection scope of the present application.
The technical solution of the present application can be widely applied to various display panels, such as TN (Twisted Nematic) display panel, IPS (In-Plane Switching) display panel, VA (Vertical Alignment) display panel, MVA (Multi-Domain Vertical Alignment) display panel, and of course, other types of display panels, such as OLED (Organic Light-Emitting Diode) display panel, and the above solution can be applied thereto.
The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered limited to these descriptions. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (8)
1. A driving method of a display module is characterized by comprising a driving process of a display panel which is synchronously driven and a driving process of a backlight module:
the backlight module comprises a plurality of independently controlled first color light sources, second color light sources and third color light sources; the light source brightness corresponding to the first color light source is a first brightness value, the light source brightness corresponding to the second color light source is a second brightness value, and the light source brightness corresponding to the third color light source is a third brightness value;
the driving process of the display panel includes the steps of:
receiving a first color signal corresponding to a display panel, converting the first color signal into a first brightness normalization signal, and converting the first brightness normalization signal into a first hue saturation brightness space signal;
adjusting a first color saturation signal of the first color saturation brightness space signal by using a preset adjustment coefficient to obtain a second color saturation signal;
converting the second color saturation signal into a second color signal;
driving the display panel with the second color signal to improve color shift;
the driving process of the backlight module comprises the following steps:
receiving a first color signal corresponding to a display panel, and obtaining a first color saturation signal and a second color saturation signal;
determining a minimum color light source in the first color light source, the second color light source and the third color light source, and acquiring a light source adjustment coefficient corresponding to the minimum color light source according to the first color saturation signal and the second color saturation signal;
adjusting the minimum color light source by using the light source adjustment coefficient to obtain a fourth brightness value; driving a minimum color light source using the fourth luminance value to improve color purity performance;
the step of determining the minimum color light source among the first color light source, the second color light source and the third color light source, and obtaining the light source adjustment coefficient corresponding to the minimum color light source according to the first color saturation signal and the second color saturation signal further includes:
determining a second largest color light source and a smallest color light source of the first color light source, the second color light source, and the third color light source;
acquiring a light source adjustment coefficient corresponding to a minimum color light source and a light source adjustment coefficient corresponding to a second largest color light source according to the first color saturation signal and the second color saturation signal;
adjusting the minimum color light source by using the light source adjustment coefficient to obtain a fourth brightness value; the driving of the minimum-color light source using the fourth luminance value includes:
adjusting the minimum color light source by using the light source adjustment coefficient corresponding to the minimum color light source to obtain a fourth brightness value, and adjusting the secondary large color light source by using the light source adjustment coefficient corresponding to the secondary large color light source to obtain a fifth brightness value;
driving the minimum color light source with the fourth luminance value and driving the second largest color light source with the fifth luminance value; the step of adjusting the first color saturation signal of the first color hue saturation brightness space signal by using a preset adjustment coefficient to obtain a second color saturation signal comprises the following steps:
the second color saturation signal S' n _ i, j is obtained from the first color saturation signal Sn _ i, j by the following formula:
S’n_i,j＝a×S4n_i,j+b×S3n_i,j+c×S2n_i,j+d×Sn_i,j+e；
wherein a, b, c, d and e are preset adjustment coefficients and are constants;
the step of converting the second color saturation signal into a second color signal comprises: converting the second color saturation signal to obtain a second color hue saturation brightness space signal, and reducing the minimum value in the brightness normalization signal according to the second color hue saturation brightness space signal to obtain a second brightness normalization signal;
and converting the second brightness normalization signal to obtain a second color signal.
2. The method according to claim 1, wherein the driving method comprises,
the step of determining the minimum color light source among the first color light source, the second color light source and the third color light source, and obtaining the light source adjustment coefficient corresponding to the minimum color light source according to the first color saturation signal and the second color saturation signal further includes:
determining a largest color light source, a second largest color light source, and a smallest color light source of the first, second, and third color light sources; acquiring a light source adjustment coefficient corresponding to the maximum color light source, a light source adjustment coefficient corresponding to the second largest color light source and a light source adjustment coefficient corresponding to the minimum color light source according to the first color saturation signal and the second color saturation signal;
adjusting the minimum color light source by using the light source adjustment coefficient to obtain a fourth brightness value; the driving of the minimum-color light source using the fourth luminance value includes:
adjusting the minimum color light source by using the light source adjustment coefficient corresponding to the minimum color light source to obtain a fourth brightness value; adjusting the secondary large color light source by using the light source adjustment coefficient corresponding to the secondary large color light source to obtain a fifth brightness value; adjusting the maximum color light source by using the light source adjustment coefficient corresponding to the maximum color light source to obtain a sixth brightness value;
driving the minimum color light source using the fourth luminance value; driving the second largest color light source with a fifth luminance value; the maximum color light source is driven using the sixth luminance value.
3. The method as claimed in claim 1, wherein the step of determining a minimum color light source among the first color light source, the second color light source, and the third color light source, and obtaining the light source adjustment coefficient corresponding to the minimum color light source according to the first color saturation signal and the second color saturation signal comprises:
the backlight module is a direct type backlight;
the direct type backlight is divided into a plurality of backlight subareas, and each backlight subarea is provided with a red light source, a green light source and a blue light source which are independent;
the first luminance normalization signal comprises a first red luminance normalization signal, a first green luminance normalization signal and a first blue luminance normalization signal;
the second brightness normalization signal comprises a second red brightness normalization signal, a second green brightness normalization signal and a second blue brightness normalization signal
Acquiring a first brightness normalization signal corresponding to the first color saturation signal, and respectively calculating to obtain an average signal of the first red brightness normalization signal, a first maximum signal, a first secondary maximum signal and a first minimum signal in the average signal of the first green brightness normalization signal and the average signal of the first blue brightness normalization signal;
acquiring a second brightness normalization signal corresponding to the second color saturation signal, and respectively calculating to obtain an average value of all second red brightness normalization signals corresponding to the backlight partition, and a second maximum signal, a second secondary maximum signal and a second minimum signal in the average values of the second green brightness normalization signal and the second blue brightness normalization signal;
acquiring a first light source adjustment coefficient corresponding to the minimum color light source according to the first minimum signal and the second minimum signal;
and acquiring a second light source adjustment coefficient corresponding to the secondary large color light source according to the first large signal and the second large signal.
4. The method as claimed in claim 3, wherein the relationship between the first maximum signal maxn _ ave, the first sub-maximum signal midn _ ave, the first minimum signal minn _ ave, the average signal rn _ ave of the first red luminance normalization signal, the average signal gn _ ave of the first green luminance normalization signal, and the average signal bn _ ave of the first blue luminance normalization signal satisfies the following formula:
maxn_ave＝Max(rn_ave、gn_ave、bn_ave)；
midn_ave＝Mid(rn_ave、gn_ave、bn_ave)；
minn_ave＝Min(rn_ave、gn_ave、bn_ave)；
the relationship of the second maximum signal max 'n _ ave, the first secondary maximum signal mid' n _ ave, the first minimum signal min 'n _ ave, the average signal of the first red luminance normalization signal r' n _ ave, the average signal of the first green luminance normalization signal g 'n _ ave, and the average signal of the first blue luminance normalization signal b' n _ ave satisfies the following equation:
max’n_ave＝Max(r’n_ave、g’n_ave、b’n_ave)；
mid’n_ave＝Mid(r’n_ave、g’n_ave、b’n_ave)；
min’n_ave＝Min(r’n_ave、g’n_ave、b’n_ave)。
5. the method as claimed in claim 4, wherein the first red luminance normalization signals corresponding to the backlight partitions are respectively: rn _1, rn _1,2, …, rn _ i, j, the first green luminance normalization signals corresponding to the backlight partitions are: gn _1, gn _1,2, …, gn _ i, j, and the first blue luminance normalization signal corresponding to the backlight partition are: bn _1, bn _1,2, …, bn _ i, j; the relationship of the average signal rn _ ave of the first red luminance normalization signal, the average signal gn _ ave of the first green luminance normalization signal, and the average signal bn _ ave of the first blue luminance normalization signal satisfies the following formula:
rn_ave＝Average(rn_1,1、rn_1,2、…、rn_i,j)；
gn_ave＝Average(gn_1,1、gn_1,2、…、gn_i,j)；
bn_ave＝Average(bn_1,1、bn_1,2、…、bn_i,j)；
the second red brightness normalization signals corresponding to the backlight partitions are respectively as follows: r ' n _1, r ' n _1,2, …, r ' n _ i, j, the second green brightness normalization signal corresponding to the backlight partition are: g ' n _1, g ' n _1,2, …, g ' n _ i, j, the second blue luminance normalization signal corresponding to the backlight partition are: b ' n _1, b ' n _1,2, …, b ' n _ i, j; the relationship among the average signal r ' n _ ave of the second red luminance normalization signal, the average signal g ' n _ ave of the second green luminance normalization signal, and the average signal b ' n _ ave of the second blue luminance normalization signal satisfies the following formula:
r’n_ave＝Average(r’n_1,1、r’n_1,2、…、r’n_i,j)；
g’n_ave＝Average(g’n_1,1、g’n_1,2、…、g’n_i,j)；
b’n_ave＝Average(b’n_1,1、b’n_1,2、…、b’n_i,j)。
6. the method according to any one of claims 4 or 5, wherein the first light source adjustment coefficient is x, and the second light source adjustment coefficient is y, so as to satisfy the following formula: midn _ ave ═ x × mid 'n _ ave, minn _ ave ═ y × min' n _ ave.
7. A driving system of a display module using the driving method of a display module according to any one of claims 1 to 6, comprising: the drive circuit of the display panel of synchronous drive to and the drive circuit of the backlight module:
the backlight module comprises a plurality of independently controlled first color light sources, second color light sources and third color light sources; the light source brightness corresponding to the first color light source is a first brightness value, the light source brightness corresponding to the second color light source is a second brightness value, and the light source brightness corresponding to the third color light source is a third brightness value;
the driving circuit of the display panel includes:
the receiving module is used for receiving a first color signal corresponding to the display panel, converting the first color signal into a first brightness normalization signal and converting the first brightness normalization signal into a first hue saturation brightness space signal;
the adjusting module is used for adjusting a first color saturation signal of the first color hue saturation brightness space signal by using a preset adjusting coefficient to obtain a second color saturation signal;
the conversion module is used for converting the second color saturation signal into a second color signal; and
the driving module is used for driving the display panel by using the second color signal;
the drive circuit of the backlight module comprises:
the light source calculation module receives a first color signal corresponding to the display panel and obtains a first color saturation signal and a second color saturation signal;
the light source determining module is used for determining a minimum color light source in the first color light source, the second color light source and the third color light source and acquiring a light source adjusting coefficient corresponding to the minimum color light source according to the first color saturation signal and the second color saturation signal;
the light source adjusting module is used for adjusting the minimum color light source by using the light source adjusting coefficient to obtain a fourth brightness value; and
and the light source driving module is used for driving the minimum color light source by using the fourth brightness value.
8. A display device comprising the display module and a driving system for the display module according to claim 7; the display module comprises a display panel and a backlight module.
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