CN109559692A - A kind of driving method of display module, drive system and display device - Google Patents
A kind of driving method of display module, drive system and display device Download PDFInfo
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- CN109559692A CN109559692A CN201811510613.4A CN201811510613A CN109559692A CN 109559692 A CN109559692 A CN 109559692A CN 201811510613 A CN201811510613 A CN 201811510613A CN 109559692 A CN109559692 A CN 109559692A
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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
- 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
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
Abstract
The invention discloses a kind of driving method of display module, drive system and display devices, drive process and backlight module to drive process including synchronously driven display panel: display module includes the first colour light source and the second colour light source of multiple independent controls；The driving method of display module is comprising steps of the first color signal of reception, is converted to the first color space signal；Color saturation adjustment is carried out to the first color space signal, is converted to the second color signal: driving display panel using the second color signal；Backlight module driving process includes: to obtain the first color space signal and the second color space signal, obtains light source regulation coefficient；The first colour light source and/or corresponding first brightness value of the second colour light source are adjusted to obtain the second brightness value using light source regulation coefficient；The first colour light source and/or the second colour light source are driven using the second brightness value.The present invention can improve colour cast and problem is presented in color saturation.
Description
Technical field
The present invention relates to technical field of display panel more particularly to a kind of driving method of display module, drive system and
Display device.
Background technique
It is formed with the development of science and technology with progress, liquid crystal display due to having thin fuselage, power saving and the low hot spot of radiation
For the main product of display, it is widely applied.Liquid crystal display on existing market is largely backlight liquid crystal
Show device comprising liquid crystal display panel and backlight module (Backlight Module).The working principle of liquid crystal display panel is flat in two panels
Liquid crystal molecule is placed in capable glass substrate, and applies driving voltage on two panels glass substrate to control the rotation of liquid crystal molecule
Turn direction, the light refraction of backlight module is come out and generates picture.
Wherein, a kind of inventor use and undocumented scheme in, by the color saturation to signal be adjusted with
Improve colour cast problem, but so operate, effect can be presented to the color saturation of signal and lose.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind to improve colour cast problem simultaneously, guarantees that color saturation is presented
A kind of display module driving method, drive system and display device.
To achieve the above object, the present invention provides a kind of driving methods of display module, including synchronously driven display
Panel driving process and backlight module drive process:
The display module includes the first colour light source and the second colour light source of multiple independent controls；
The driving method of the display module comprising steps of
The first color signal under the corresponding RGB system of display panel is received, the first color signal is converted in HSV body
The first color space signal under system；
Color saturation adjustment is carried out to the first color space signal using default regulation coefficient, is obtained under HSV system
Second color space signal；The second color signal under RGB system is converted to according to the second color space signal:
Display panel is driven using the second color signal；
Backlight module driving process includes:
The first color signal under the corresponding RGB system of display panel is received, and obtains the first color under HSV system
Spacing wave and the second color space signal obtain light source adjustment according to the first color space signal and the second color space signal
Coefficient；
The first colour light source and/or corresponding first brightness value of the second colour light source are adjusted using light source regulation coefficient
It is whole to obtain the second brightness value；
The first colour light source and/or the second colour light source are driven using the second brightness value.
The present invention also provides a kind of drive systems of display panel, use the drive of any display module of the present invention
Dynamic method, comprising:
Synchronously driven display panel, drive circuit and drive circuit for backlight module group；
The display module includes the first colour light source and the second colour light source of multiple independent controls；
The display panel, drive circuit includes:
Receiving module, for receiving the first color signal under the corresponding RGB system of display panel, by the first color signal
Be converted to the first color space signal under HSV system；
Color saturation adjusts module, for carrying out color saturation tune to the first color space signal using default regulation coefficient
It is whole, obtain the second color space signal under HSV system；It is converted under RGB system according to the second color space signal
The second color signal:
Display panel drive module, for driving display panel using the second color signal；
The drive circuit for backlight module group includes:
Light source regulation coefficient computing module receives the first color signal under the corresponding RGB system of display panel, and obtains
The first color space signal and the second color space signal under HSV system, according to the first color space signal and the second color
Color space signal obtains light source regulation coefficient；
Light source adjusting module, for corresponding to the first colour light source and/or the second colour light source using light source regulation coefficient
The first brightness value be adjusted to obtain the second brightness value；
Backlight module drive module, for using the second brightness value to the first colour light source and/or the second colour light source into
Row driving.
The invention also discloses a kind of display device, the drive system including a kind of such as above-mentioned display panel.
In the present invention, know in a kind of inventor and in undocumented technology, since RGB system is in high color saturation value
Under, it is easy to appear the serious problem of colour cast, thus, the first color signal under RGB system is first converted to under HSV system
One color space signal, then the first color space signal is adjusted, and finally obtain colour cast problem is improved second
Color signal；Meanwhile on this basis, second brightness value is then to adjust the strong of light source while color saturation adjustment
Degree, can back within saturated hue from desaturated color point from side by the chroma signal that color saturation is damaged,
While reduction colour cast is especially big visual angle colour cast, the good presentation of color saturation is maintained, reaches good color pure color performance.
Detailed description of the invention
Included attached drawing is used to provide that a further understanding of the embodiments of the present application, and which constitute one of specification
Point, for illustrating presently filed embodiment, and with verbal description come together to illustrate the principle of the application.Under it should be evident that
Attached drawing in the description of face is only some embodiments of the present application, for those of ordinary skill in the art, is not paying wound
Under the premise of the property made is laborious, it is also possible to obtain other drawings based on these drawings.In the accompanying drawings:
Fig. 1 is that the big visual angle of the various representative colour systems of liquid crystal display and front viewing angle colour cast change schematic diagram；
Fig. 2 is that original pixel is divided into the first schematic diagram of primary and secondary pixel in exemplary arrangement；
Fig. 3 is that original pixel is divided into the second schematic diagram of primary and secondary pixel in exemplary arrangement；
Fig. 4 is a kind of driving process flow diagram flow chart of display panel of the embodiment of the present invention；
Fig. 5 is a kind of driving process flow diagram flow chart of backlight module of the embodiment of the present invention；
Fig. 6 is the schematic diagram of straight-down negative display module of the embodiment of the present invention；
Fig. 7 is the correlation function schematic diagram that the embodiment of the present invention second presets regulation coefficient H2；
Fig. 8 is the current chroma signal of the embodiment of the present invention and the variation schematic diagram of the second chroma signal；
Fig. 9 is the current chroma signal of the embodiment of the present invention and the chromatic aberration curve of the second chroma signal
Figure；
Figure 10 is the chromatic aberration signal of the current chroma signal and the second chroma signal of the embodiment of the present invention
Figure；
Figure 11 is a kind of drive system schematic diagram of display panel of the embodiment of the present invention；
Figure 12 is a kind of drive circuit schematic diagram of display panel of the embodiment of the present invention；
Figure 13 is a kind of drive circuit schematic diagram of backlight module of the embodiment of the present invention；
Figure 14 is a kind of schematic diagram of display device of the embodiment of the present invention.
Wherein, 100, the drive system of display panel；200, display device；110, display panel, drive circuit；111, it connects
Receive module；112, color saturation adjusts module；113, display panel drive module；120, drive circuit for backlight module group；121, light
Source adjusts computing module；122, light source adjusting module；123, backlight module drive module；130, the first colour light source；140,
Second colors light source.
Specific embodiment
Specific structure and function details disclosed herein are only representative, and are for describing the present invention show
The purpose of example property embodiment.But the present invention can be implemented by many alternative forms, and be not interpreted as
It is limited only by the embodiments set forth herein.
Fig. 1 is that the present invention is the schematic diagram for using the design of primary and secondary pixel to improve colour cast problem.
Large scale liquid crystal display panel, especially VA (Vertica Aignment, vertical orientation technology) type liquid crystal display
Panel, corresponding big visual angle brightness are rapidly saturated with voltage, cause visual angle image quality to when colour cast compared to facing image quality quality
Deteriorate serious.
Fig. 1 is that the big visual angle of the various representative colour systems of liquid crystal display and front viewing angle colour cast change schematic diagram, with reference to figure
1, it is apparent that, the big visual angle colour cast situation of the colour system of inclined R, G, B form and aspect is come seriously compared with other colour systems.
Exemplary solution is by that RGB (Red, Green, Blue) each sub-pixel will be further subdivided into major/minor picture
Plain (main/sub), so that whole big visual angle brightness is closer to face with voltage change.
Fig. 2 is the first contrast schematic diagram that do not distinguish primary and secondary pixel and distinguish primary and secondary pixel, and Fig. 3 is not distinguish primary and secondary picture
Second contrast schematic diagram of element and difference primary and secondary pixel, knows referring to figs. 2 and 3, wherein the x coordinate, y-coordinate and z coordinate,
Respectively represent three directions of three-dimensional space；The θ A indicates that the pre-dumping lead angle under the wherein big voltage of main pixel, the θ B indicate wherein
Pre-dumping lead angle under sub-pixel small voltage.Wherein, the abscissa in the Fig. 3 is grayscale signal, and ordinate is luminance signal,
Under big visual angle, brightness is rapidly saturated with signal, causes big visual angle colour cast problem (Fig. 3, the arc segment in left side), and distinguishes primary and secondary picture
Element can improve this problem to a certain extent.
Specifically, original signal to be divided into the primary and secondary pixel of big voltage+small voltage, facing big voltage will maintain plus small voltage
Original faces signal with brightness change, and with the PART A in gray scale variation such as Fig. 3, small voltage is seen for the side view brightness that big voltage is seen
Side view brightness with the PART B in gray scale variation such as Fig. 3.Side view synthesizes the brightness seemed with gray scale variation as green in this way
Line, more close to the positive brightness of red line with the relationship of gray scale variation, so visual angle brightness faces original with signal intensity relationship is close
Luminance signals are with signal intensity so that visual angle is improved.
It is this by spatially primary and secondary pixel to give different driving voltages to solve visual angle colour cast and obtain defect, such
Pixel design generally requires redesign metal routing or thin film transistor (TFT) (Thin Film Transistor, TFT) element to drive
Dynamic sub-pixel, causes light-permeable open region sacrifice, influences the saturating rate of panel, directly contribute the promotion of backlight cost.
Thus, the present invention is based on different technical concepts, improvement obtains following scheme:
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 4 is a kind of driving process flow diagram flow chart of display panel of the embodiment of the present invention；Fig. 5 is a kind of back of the embodiment of the present invention
The driving process flow diagram flow chart of optical mode group；As shown in Figure 4 and Figure 5, the embodiment of the present invention discloses a kind of driving side of display module
Method, which is characterized in that drive process and backlight module to drive process including synchronously driven display panel:
The display module includes the first colour light source and the second colour light source of multiple independent controls；
The driving method of the display module comprising steps of
S11: the first color signal under the corresponding RGB system of display panel is received, the first color signal is converted to
The first color space signal under HSV system；
S12: carrying out color saturation adjustment to the first color space signal using default regulation coefficient, obtain HSV (Hue,
Saturation, Value) the second color space signal under system；It is converted to according to the second color space signal in RGB body
The second color signal under system:
S13: display panel is driven using the second color signal；
Backlight module driving process includes:
S21: the first color signal under the corresponding RGB system of display panel is received, and obtains the first color under HSV system
Color space signal and the second color space signal obtain light source tune according to the first color space signal and the second color space signal
Integral coefficient；
S22: using light source regulation coefficient to the first colour light source and/or corresponding first brightness value of the second colour light source into
Row adjustment obtains the second brightness value；
S23: the first colour light source and/or the second colour light source are driven using the second brightness value.
Wherein, this is used for the drive system using the driving method, can be set in front end, be arranged in display panel when
Sequence controls in chip, and the performance-relevant default of display panel corresponding with the drive system is also stored in timing controller
The parameters such as regulation coefficient look-up table.
In the present invention, know in a kind of inventor and in undocumented technology, since RGB system is in high color saturation value
Under, it is easy to appear the serious problem of colour cast, thus, the first color signal under RGB system is first converted to under HSV system
One color space signal, then the first color space signal is adjusted, and finally obtain colour cast problem is improved second
Color signal；Meanwhile on this basis, second brightness value is then to adjust the strong of light source while color saturation adjustment
Degree, can back within saturated hue from desaturated color point from side by the chroma signal that color saturation is damaged,
While reduction colour cast is especially big visual angle colour cast, the good presentation of color saturation is maintained, reaches good color pure color performance.
Wherein, display panel driving process and backlight module driving process can be and independently carry out, and simultaneously into
Row driving, for example, during backlight module driving, obtaining the first color space signal and the second color space signal can be with
It is independently of other than display panel driving process, is calculated alone；It is of course also possible to be to drive process from display panel
It obtains, is then transferred to backlight module (corresponding signal processing module) and light source regulation coefficient is calculated again, as long as control
The last synchronous driving display panel of system and backlight module.
Fig. 6 is a kind of schematic diagram of direct-type backlight display module, with reference to Fig. 6, in conjunction with Fig. 4 and Fig. 5 it is found that implementing one
In example, which is direct-type backlight display module, and the direct-type backlight display module includes multiple backlights point
Area, each backlight subarea respectively include first colour light source and the second colour light source of multiple independent controls；
The backlight subarea further includes the third colour light source of multiple independent controls.
Wherein, which includes multiple backlight subareas, and each backlight subarea can include three kinds of independences as shown in Figure 6
The light source of control is readily applicable to other frameworks.
Certainly, other kinds of display module is also possible, as long as being applicable in.
In the present solution, the display panel is direct type backlight panel, the display panel of this type can be realized preferably
The technology that color saturation missing is made up by intensity of light source adjusting, specifically, each backlight subarea includes multiple independent controls
The first colour light source, the second colour light source and third colour light source；In this way, due to color saturation value S=1-min/max,
Middle min and max is related to the stimulation value signal under RGB system, is determined by calculation, and increases the light source of which or which light source
Intensity, can to supplement color saturation it is helpful, and correspondence be adjusted, while improving colour cast problem, maintenance it is good
Good color pure color performance.
In one embodiment, this obtains light source regulation coefficient according to the first color space signal and the second color space signal
The step of include:
Obtain the first color space signal and the second color sky that present frame corresponds to all pixels in current backlight subregion
Between signal, calculate separately the corresponding first average chroma signal of the first color space signal and the second color space letter
Number corresponding second average chroma signal；
Light source regulation coefficient is calculated according to the first average chroma signal and the second average chroma signal.
In the present solution, in the present solution, the adjustment of the intensity of light source as unit of a backlight subarea, obtains the first all colors
Color space signal and the second color space signal, in this way, just can based on the first color space signal and the second color space signal
It enough calculates separately to obtain the corresponding first average chroma signal Sn_ave of the first color signal and the second color signal is corresponding
The second average chroma signal S ' n_ave come measure before color saturation adjustment operation and color saturation adjustment operation after
Chroma signal between difference, then difference based on the two calculates light source regulation coefficient, enables to display panel
Backlight subarea is entirety with backlight subarea, each backlight subarea independently compensates colour saturation while improving colour cast problem
Degree, to maintain good color pure color to show.
In one embodiment, the calculating of the light source regulation coefficient includes the following steps:
Using formula S n_ave=Average (Sn_1,1, Sn_1,2 ..., Sn_i, j), calculate the first color space signal
Corresponding first average chroma signal；
Use formula S ' n_ave=Average (S ' n_1,1, S ' n_1,2 ..., S ' n_i, j) calculate the second color space
The corresponding second average chroma signal of signal；
Light is calculated according to the first average chroma signal Sn_ave and second chroma signal S ' n_ave that is averaged
Source regulation coefficient.
In the present solution, it is empty to obtain all the first color space signal and the second color as unit of a backlight subarea
Between signal, and grab chroma signal therein, all chroma signals be averaged, to calculate light source adjustment system
Number, enables to the backlight subarea of display panel while improving colour cast problem, take backlight subarea as whole, each backlight point
Independent compensation color saturation is distinguished in area, to maintain good color pure color to show.
Wherein, the step of the first color signal being converted to the first color space signal under HSV system include:
The first color signal Rn_i, j, Gn_i, j, Bn_i, j are obtained, and each group of RGB three primary colors sub-pixel grayscale is believed
Number it is converted into three primary colors normalization luminance signal r, g, b；Completion is converted to the first normalization luminance signal rn_i, j, gn_i,
j,bn_i,j；
The first color signal is converted into the first color space signal Sni, j=1- according to the first normalization luminance signal
minni,j/maxni,j；
Color saturation value is carried out to current chroma signal using default regulation coefficient and turns down processing；Complete color saturation
The step of adjustment of signal is handled, and obtains the second color space signal under HSV system include:
In the case where keeping maxni j constant, minni, j are adjusted using default regulation coefficient H；
The adjustment processing for completing chroma signal, obtains the second color space signal S ' n_i, j=under HSV system
1-minni,j*H/maxni,j；Wherein, minni, j=min (rn_i, j, gn_i, j, bn_i, j), wherein maxni, j=max
(rn_i,j,gn_i,j,bn_i,j).Wherein: Sn_i, j=1-minn_i, j/maxn_i, j；
Wherein, minn_i, j=min (r, g, b)；Maxn_i, j=max (r, g, b)；
Wherein, r=(R/255) ^ γ r, g=(G/255) ^ γ g, b=(B/255) ^ γ b；
Wherein, γ r, γ g, the gamma signal that γ b is the first color signal；
Wherein, R, G, B refer to the corresponding RGB tricolor gray-scale digital signal of the first color signal.In the present solution, corresponding
First color space signal of the first color signal, and the second color space signal of corresponding second color signal, calculate separately
The average value of all chroma signals in backlight subarea obtains the first average chroma signal and the second average color saturation
Signal, and the color saturation presentation difference that backlight subarea carries out color saturation adjustment front and back (in order to improve colour cast) is reacted with this,
And your regulation coefficient of light source is calculated with this, it calculates that step is simple, on the basis of whole display effect, improves production effect
Rate, and be conducive to keep the whole uniformity of the color saturation of backlight subarea, avoid local color saturation excessively high or too low
Problem is conducive to promote display effect.
In one embodiment, this is according to the first average chroma signal and the second average chroma signal calculating
The step of light source regulation coefficient includes:
Calculate the first average chroma signal Sn_ave=1-minn_ave/maxn_ave；
Calculate the second average chroma signal S ' n_ave=1-min ' n_ave/maxn_ave；
Third is obtained to the second average chroma signal using light source regulation coefficient to be averaged chroma signal S " n_
ave；
Wherein light source regulation coefficient y meets following formula: S " n_ave=Sn_ave, it may be assumed that
1-minn_ave/maxn_ave=1-min ' n_ave/ (maxn_ave*y), thus, y=(S ' n_ave-1)/
(Sn_ave-1)；
Wherein, maxn_ave is the sub- picture of red for the first color signal that present frame corresponds to all pixels in backlight subarea
Maximum average signal in plain average signal, green sub-pixels average signal and blue subpixels average signal；Minn_ave is
It is flat that present frame corresponds to the red sub-pixel average signal of the first color signal of all pixels in backlight subarea, green sub-pixels
Minimum average B configuration signal in equal signal and blue subpixels average signal；
Wherein, maxn_ave is the red for the second color signal that present frame corresponds to all pixels in backlight subarea simultaneously
Maximum average signal in sub-pixel average signal, green sub-pixels average signal and blue subpixels average signal；min'n_
Ave is the red sub-pixel average signal for the second color signal that present frame corresponds to all pixels in backlight subarea, green
Minimum average B configuration signal in pixel average signal and blue subpixels average signal.
In the present solution, the maximum average signal of second color signal and the maximum average signal of the first color signal are one
It causes, this is because keeping the maxni of each pixel in color saturation adjustment, j is constant, and adjusts minni, j, thus, most
The maxn_ave obtained eventually is constant；Wherein, above-mentioned Sn_ave=1-minn_ave/maxn_ave and S ' n_ave=1-
Min ' n_ave/maxn_ave do not need it is actual go to calculate minn_ave, maxn_ave and min ' n_ave, but can lead to
It crosses chroma signal to calculate to obtain, the numerical value that these reckonings are obtained calculates for assisting, finally obtains light source regulation coefficient
Y=(S ' n_ave-1)/(Sn_ave-1), according to formula S n_ave=Average (Sn_1,1, Sn_1,2 ..., Sn_i, j), with
And formula S ' n_ave=Average (S ' n_1,1, S ' n_1,2 ..., S ' n_i, j), light source regulation coefficient can be calculated；
And the light source regulation coefficient is to be calculated based on the whole color saturation difference of backlight subarea, it is ensured that backlight
The color saturation of subregion can be compensated well.
In one embodiment, the step of current chroma signal of the acquisition corresponding default regulation coefficient includes: to obtain
The chroma signal of first color space signal, is calculated based on chroma signal according to preset calculation formula or base
It searches to obtain by default regulation coefficient look-up table in chroma signal.
In the present solution, the color saturation of signal is higher, and colour cast is more serious under RGB colorimetric system；In this way, in certain colour saturations
In the case of angle value, colour cast is very serious, and in the case of certain color saturation values, colour cast problem is unobvious, belongs to acceptable model
It encloses；The present invention obtains current chroma signal, and obtains the corresponding default regulation coefficient of current chroma signal, to color
Saturation signal carries out color saturation adjustment, thus by color saturation value control in the less serious region of colour cast problem, from
And the problem of improving colour cast；Also, this programme is not based on sacrificing light-permeable open region, therefore, it is possible to avoid light permeable rate
Reduction, avoid the promotion of display panel production cost.
In one embodiment, this carries out color saturation adjustment to the first color space signal using default regulation coefficient, obtains
Include: to the step of the second color space signal under HSV system
The current chroma signal for obtaining the first color space signal, detect current chroma signal whether meet it is pre-
If color saturation threshold value, and whether it is located at adjustment tone section, if being all satisfied, based on chroma signal, according to correspondence
Color saturation value and tone section obtain corresponding default regulation coefficient；
Current chroma signal is adjusted using default regulation coefficient, the second color obtained under HSV system is empty
Between signal.
Wherein, which can be 0.5, and the then judgement greater than 0.5 meets color saturation threshold value；Or it can be with
It is that section, such as 0.5-1 (not including 0.5 and 1) carry out color saturation tune that is, when current color saturation is greater than 0.5 less than 1
It is whole, and current color saturation is equal to 0.5 or 1, can adjust without color saturation.
In the present solution, only part chroma signal will do it adjustment operation, the chroma signal of the part is not only wanted
Meet color saturation threshold value, in addition, it is desirable to meet tone section；This is because color saturation value and colour cast between different tone zones
Corresponding relationship is different；Color saturation value is higher, and colour cast problem is more serious；In addition, colour cast problem is tighter closer to dominant hue
Weight, for example, in the corresponding tone section of blue mass tone tune of 240 degree of tones, in the case of same color saturation value, colour cast degree
Considerably beyond the non-adjustment tone section of 300 degree of tones；Even if satisfying at this point, the chroma signal of 300 degree of tones meets color
With degree threshold value, but corresponding colour cast degree is also likely to be very little without being improved；Similarly, color saturation value is high,
But tone section is properly, the colour cast problem of corresponding chroma signal may can't especially severe without into
The adjustment of row color saturation；In this way, only being adjusted to the chroma signal for the colour cast problem for meeting preset threshold and tone section
Whole processing, such as reduce the processing of color saturation value, can be while improving colour cast problem, and can be to avoid to not needing
The signal for carrying out colour cast adjustment carries out the unnecessary color saturation value that such as reduces and handles, and is conducive to the display for improving display panel
Effect.
Wherein, which can at least be split as the first tone section, the second tone zone according to tone difference
Between and third tone section；In described the step of obtaining current chroma signal corresponding default regulation coefficient: correspondence is same
The color saturation value of a tone, the current chroma signal is bigger, and the adjustment amplitude for adjusting processing is bigger.
In the present solution, under especially same tone, the color saturation value of chroma signal is got over due to same tone section
Height, corresponding colour cast problem are more serious；Thus, the adjustment amplitude of this programme signal supreme to color saturation is larger, and color is full
The adjustment amplitude of the signal low with angle value is smaller；Wherein, place usually is turned down to chroma signal progress color saturation value
Reason, in this way, the colour saturation gap of each signal just can be reduced, avoids the too high bring colour cast problem of color saturation, meanwhile, it keeps away
Exempt from the excessive bring colour cast problem of color saturation difference, achievees the effect that preferably to improve colour cast.Certainly, the color saturation value compared with
It is also possible that low chroma signal carries out height-regulating processing, so that between different chroma signals more evenly,
The problem of colour cast can be improved to a certain extent.
In addition, adjustment amplitude here generally refers to turn down the amplitude of chroma signal, not according to calculation formula
Together, color saturation value is bigger, corresponding default regulation coefficient may also it is smaller may also be bigger, but adjust the bigger effect of amplitude
Fruit is constant；Citing, if the default regulation coefficient is the coefficient of entire chroma signal, such as S '=S*H (wherein, S
For current chroma signal, S ' is the second chroma signal, and H is default regulation coefficient), then turn down amplitude it is bigger when, in advance
If the value of regulation coefficient is smaller；If default regulation coefficient be chroma signal wherein the coefficient of some parameter when, turn down
Amplitude is bigger, and corresponding coefficient is also likely to be bigger, such as (wherein, S is current color saturation letter to S '=1-min*H/max
Number, S ' is the second chroma signal, and H is default regulation coefficient) when, default regulation coefficient at this time is bigger, corresponding to turn down
Amplitude is bigger.
Specifically, the first tone section, the second tone section and third tone section be respectively red tone section, it is green
Color tone section and blue color section；
Current chroma signal with same color saturation value, the default adjustment system in corresponding blue color section
Several adjustment amplitudes to current chroma signal, greater than corresponding red tone section the default regulation coefficient to current color
The adjustment amplitude of saturation signal；Tune of the default regulation coefficient in corresponding red tone section to current chroma signal
Whole picture degree, greater than adjustment amplitude of the default regulation coefficient to current chroma signal for corresponding to green tone section.This
In scheme, the colour cast problem degree of the chroma signal based on different tone sections is different, in same color saturation value situation
Under, the colour cast in part of tone section is serious, and the colour cast in partial tone section is lighter；Under RGB system, blue color area
Between chroma signal colour cast problem most serious, the colour cast problem of the chroma signal in green tone section is most light；This
Scheme, by taking S '=S*H as an example, the default regulation coefficient in corresponding blue color section can be less than the pre- of corresponding red tone section
If regulation coefficient, the default regulation coefficient in corresponding red tone section can be less than the default adjustment system in corresponding green tone section
Number, default regulation coefficient is smaller at this time, and the amplitude of adjustment is bigger；It is corresponding, by taking S '=1-min*H/max as an example, correspond at this time
The default regulation coefficient in blue color section is maximum and adjustment amplitude is maximum, and the default regulation coefficient in corresponding green tone section is most
Small and adjustment amplitude is minimum；Under such same color saturation value, the chroma signal in the blue color section turns down amplitude
Maximum, and the chroma signal in the green tone section turns down amplitude minimum, and it is excessive can not only to reduce color saturation value
Bring colour cast problem, and the color saturation for making chroma signal is more evenly, is also beneficial to improve to a certain extent
Colour cast problem, to achieve the effect that good improvement colour cast.
In one embodiment, this turns down current chroma signal S progress color saturation value using default regulation coefficient
Processing；The adjustment processing for completing chroma signal, obtains and is converted to according to the second chroma signal S ' in HSV system
Under the second color space signal the step of in:
According to current chroma signal S and the second chroma signal S ', third chroma signal S " is calculated；
It completes color saturation value twice to adjust, is based on third chroma signal S ", obtains the second color under HSV system
Color space signal；
The second color signal under RGB system is converted to according to the second color space signal to drive display panel.
Fig. 7 is the correlation function schematic diagram that the embodiment of the present invention second presets regulation coefficient H2, with reference to Fig. 7, extremely in conjunction with Fig. 4
Fig. 6 is it is found that specifically, third chroma signal S " meets following formula: S "=S- (S-S ') * H2；
The second default regulation coefficient H2 meets following formula:
H2=2*ABS (sin ((Hue/360*3-1/2) * π) -1.
In the present solution, under RGB system, 0 degree is defined as red solid color shade, 120 degree are green solid color shade, 240 degree
For blue solid color shade, closer to solid color shade, then colour cast problem is more serious (under same color saturation value)；It is second pre- based on this
If regulation coefficient H2, secondary adjustment by a larger margin will be obtained closer to the chroma signal of solid color shade, and far from pure color
The chroma signal of tone then obtains secondary adjustment more by a small margin；In this way, for the saturation signal close to solid color shade
It can achieve the effect that preferably to improve colour cast problem, and reduction can then be reached for the saturation signal far from solid color shade
Improve the damage that whole color saturation is presented in colour cast, to reach the balance of colour cast and color saturation, is conducive to promote display surface
The display effect of plate.
In the stage of color saturation adjustment:
Fig. 8 is the current chroma signal of the embodiment of the present invention and the variation schematic diagram of the second chroma signal, Fig. 9
It is the current chroma signal of the embodiment of the present invention and the chromatic aberration curve graph of the second chroma signal, Figure 10 is this hair
The current chroma signal of bright embodiment and the chromatic aberration schematic diagram of the second chroma signal.
Wherein, the chromatic aberration figure of the Fig. 9, in the case of can be positive visual angle.Dotted line in the Figure 10 is that current color is full
With degree signal corresponding chromatic aberration under various colour systems, solid line is the second chroma signal corresponding color under various colour systems
Difference variation.
Specifically, the input signal RGB tricolor signal of display, if the driving of display is parsed using 8bit color
Degree, then 255 grayscale driving signals that the contrast of RGB three-primary color input signal can be analyzed to 0,1,2 ....The present invention is former by RGB tri-
Color input signal is converted into HSV color space signal, according to different tones and color saturation value tune under the color space of HSV
Whole color saturation achievees the effect that color bias improvement.
With reference to attached drawing 1, the big visual angle of the various representative colour systems of liquid crystal display and front viewing angle colour cast change, can be obvious
It was found that the big visual angle colour cast situation of the colour system of inclined R, G, B form and aspect is come seriously compared with other colour systems, therefore solve R, G, B form and aspect
Colour cast defect can greatly promote the whole color bias improvement at big visual angle.Wherein, RGB tri- in other words of the color signal under RGB system
The calculation that primary signal is converted into HSV signal is described below:
The trichromatic input signal of RGB is 0,1 ..., and 255 8bit grayscale digital signal, each grayscale signal is corresponding to 255
The brightness normalized signal (using 255 grayscale as maximum brightness) of input signal is respectively r, g, b.
Wherein r=(R/255) ^ γ r, g=(G/255) ^ γ g, b=(B/255) ^ γ b, wherein γ r, γ g, γ b are institute
Gamma signal is called, numerical digit grayscale signal is converted to the index parameters of luminance signal.H is tonal signaling, r, g, and b normalization is bright
Degree signal, which penetrates, is converted into tone h and saturation degree s signal.Wherein, H is color representative, represents different form and aspect by 0 degree~360 degree
Color is presented, wherein defining 0 degree as red, 120 degree are green, and 240 degree are blue.
The transformational relation of r, g, b normalized brightness signal and tone h and saturation signal s, meets following formula:
It can to sum up find, when tone is close to R, G, B solid color shade, the colour cast deterioration watched there are visual angle is more obvious,
When tone is close to R, G, B solid color shade, the more big then color offset phenomenon of color saturation s is more obvious simultaneously.Can through reduce R, G,
Color saturation s when B solid color shade, i.e., closer to solid color shade, color saturation adjusts the color that amplitude is bigger, makes big visual angle ornamental
Compared to the color perfecting Peng problem for facing observation or eliminate colour cast problem.
In addition, after completing color saturation adjustment a detecting step can also be increased, for example, color saturation is believed
Number be converted to CIE Lu ' v ' color space signal (CIE, Commission Internationale de L'Eclairage, state
Border illuminates the committee), wherein L is lightness dimension, and u ' and v ' they are chromaticity coordinates.In order to improve colour cast problem, color saturation adjustment
Reduce to current chroma signal the processing of color saturation value, if but in order to reduce color saturation loss to the greatest extent
Words, pure color variation, i.e., from current chroma signal S, to the variation of the second chroma signal S ', i.e. purity variation or color difference
Δ uv should meet:
Δ uv=√ ((u_1-u_2) ^2+ (v_1-v_2) ^2)≤0.02.Wherein, u_1 and v_1 is current color saturation letter
Number chromaticity coordinate, the u_2 and v_2 are the chromaticity coordinates of the second chroma signal, i.e., the color after color saturation adjustment is full
With degree signal.
Figure 11 is a kind of schematic diagram of the drive system of display panel of the present invention, and Figure 12 is a kind of display of the embodiment of the present invention
The drive circuit schematic diagram of panel；Figure 13 is a kind of drive circuit schematic diagram of backlight module of the embodiment of the present invention；With reference to Figure 11-
13, in conjunction with known to Fig. 1-Figure 10: the present invention also provides a kind of drive systems 100 of display panel, comprising:
Synchronously driven display panel, drive circuit 110 and drive circuit for backlight module group 120；
The display module includes the first colour light source 130 and the second colour light source 140 of multiple independent controls；
The display panel, drive circuit 110 includes:
Receiving module 111, i.e. reception circuit, for receiving the first color signal under the corresponding RGB system of display panel,
First color signal is converted to the first color space signal under HSV system；
Color saturation adjusts module 112, i.e. color saturation adjustment circuit, for using default regulation coefficient to the first color
Spacing wave carries out color saturation adjustment, obtains the second color space signal under HSV system；Believed according to the second color space
Number it is converted to the second color signal under RGB system:
Display panel drive module 113, i.e. the first driving circuit, for driving display panel using the second color signal；
The drive circuit for backlight module group 120 includes:
Light source regulation coefficient computing module 121, i.e. light source regulation coefficient counting circuit, it is corresponding for receiving display panel
The first color signal under RGB system, and obtain the first color space signal under HSV system and the second color space letter
Number, light source regulation coefficient is obtained according to the first color space signal and the second color space signal；
Light source adjusting module 122, i.e. light source regulation circuit, for using light source regulation coefficient to the first colour light source and/
Or second corresponding first brightness value of colour light source be adjusted to obtain the second brightness value；Backlight module drive module 123, i.e.,
Two driving circuits, for being driven using the second brightness value to the first colour light source and/or the second colour light source.
Figure 14 is a kind of schematic diagram of display device of the present invention, with reference to Figure 14, in conjunction with known to Fig. 1-Figure 13: the present invention also public affairs
A kind of display device 200 is opened, including a kind of drive system 100 of display panel as described in the present invention.
It should be noted that the restriction for each step being related in this programme, in the premise for not influencing concrete scheme implementation
Under, it does not regard as being can be the step of making restriction to step sequencing, write on front what is first carried out, be also possible to
It executes, is possibly even performed simultaneously afterwards, as long as this programme can be implemented, all shall be regarded as belonging to protection model of the invention
It encloses.
Technical solution of the present invention can be widely applied to various display panels, such as TN type display panel (full name Twisted
Nematic, i.e. twisted nematic panel), IPS type display panel (In-Plane Switching, plane conversion), VA type show
Panel (Vertical Alignment, vertical orientation technology), MVA type display panel (Multi-domain Vertical
Alignment, more quadrant vertical orientation technologies), it is of course also possible to be other kinds of display panel, such as organic light emitting display
Panel (organic light-emitting diode, abbreviation OLED display panel), applicable above scheme.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (10)
1. a kind of driving method of display module, which is characterized in that drive process, and back including synchronously driven display panel
Optical mode group drives process:
The display module includes the first colour light source and the second colour light source of multiple independent controls；
The driving method of the display module comprising steps of
The first color signal under the corresponding RGB system of display panel is received, the first color signal is converted under HSV system
The first color space signal；
Color saturation adjustment is carried out to the first color space signal using default regulation coefficient, obtains second under HSV system
Color space signal；The second color signal under RGB system is converted to according to the second color space signal:
Display panel is driven using the second color signal；
Backlight module driving process includes:
The first color signal under the corresponding RGB system of display panel is received, and obtains the first color space under HSV system
Signal and the second color space signal obtain light source adjustment system according to the first color space signal and the second color space signal
Number；
The first colour light source and/or corresponding first brightness value of the second colour light source are adjusted using light source regulation coefficient
To the second brightness value；
The first colour light source and/or the second colour light source are driven using the second brightness value.
2. a kind of driving method of display module as described in claim 1, which is characterized in that the display module is straight-down negative
Backlight display mould group, the direct-type backlight display module include multiple backlight subareas, and each backlight subarea respectively includes
First colour light source of multiple independent controls and the second colour light source；
The backlight subarea further includes the third colour light source of multiple independent controls.
3. a kind of driving method of display module as claimed in claim 2, which is characterized in that described according to the first color space
The step of signal and the second color space signal obtain light source regulation coefficient include:
Obtain the first color space signal and the second color space letter that present frame corresponds to all pixels in current backlight subregion
Number, calculate separately the corresponding first average chroma signal of the first color space signal and the second color space signal pair
The average chroma signal of second answered；
Light source regulation coefficient is calculated according to the first average chroma signal and the second average chroma signal.
4. a kind of driving method of display module as claimed in claim 3, which is characterized in that the meter of the light source regulation coefficient
Include the following steps:
Using formula S n_ave=Average (Sn_1,1, Sn_1,2 ..., Sn_i, j), it is corresponding to calculate the first color space signal
The first average chroma signal；
Use formula S ' n_ave=Average (S ' n_1,1, S ' n_1,2 ..., S ' n_i, j) calculate the second color space signal
Corresponding second average chroma signal；
Light source tune is calculated according to the first average chroma signal Sn_ave and second chroma signal S ' n_ave that is averaged
Integral coefficient.
5. a kind of driving method of display module as claimed in claim 4, which is characterized in that described to turn the first color signal
The step of the first color space signal being changed under HSV system includes:
The first color signal Rn_i, j, Gn_i, j, Bn_i, j are obtained, and each group of RGB three primary colors sub-pixel grayscale signal is turned
Change three primary colors normalization luminance signal r, g, b into；Completion is converted to the first normalization luminance signal rn_i, j, gn_i, j, bn_
i,j；
The first color signal is converted into the first color space signal Sn_i, j=1- according to the first normalization luminance signal
minni,j/maxni,j；
Color saturation value is carried out to current chroma signal using default regulation coefficient and turns down processing；Complete chroma signal
Adjustment processing, the step of obtaining the second color space signal under HSV system includes:
In the case where keeping maxni j constant, minni, j are adjusted using default regulation coefficient H；
The adjustment processing for completing chroma signal, obtains the second color space signal S ' ni, j=1- under HSV system
minni,j*H/maxni,j；
Wherein, minni, j=min (rn_i, j, gn_i, j, bn_i, j), wherein maxni, j=max (rn_i, j, gn_i, j,
bn_i,j)。
6. a kind of driving method of display module as claimed in claim 5, which is characterized in that described full according to the first average color
Include: with the step of degree signal and the second average chroma signal calculating light source regulation coefficient
Calculate the first average chroma signal Sn_ave=1-minn_ave/maxn_ave；
Calculate the second average chroma signal S ' n_ave=1-min ' n_ave/maxn_ave；
Third is obtained to the second average chroma signal using light source regulation coefficient to be averaged chroma signal S " n_ave；
Wherein light source regulation coefficient y meets following formula:
S " n_ave=Sn_ave, it may be assumed that
1-minn_ave/maxn_ave=1-min ' n_ave/ (maxn_ave*y), thus, y=(S ' n_ave-1)/(Sn_
ave-1)；
Wherein, maxn_ave is that the red sub-pixel for the first color signal that present frame corresponds to all pixels in backlight subarea is flat
Maximum average signal in equal signal, green sub-pixels average signal and blue subpixels average signal；Minn_ave is current
Frame corresponds to the red sub-pixel average signal of the first color signal of all pixels in backlight subarea, green sub-pixels are averagely believed
Number and blue subpixels average signal in minimum average B configuration signal；
Wherein, maxn_ave is the red sub- picture for the second color signal that present frame correspond to all pixels in backlight subarea simultaneously
Maximum average signal in plain average signal, green sub-pixels average signal and blue subpixels average signal；Min ' n_ave is
It is flat that present frame corresponds to the red sub-pixel average signal of the second color signal of all pixels in backlight subarea, green sub-pixels
Minimum average B configuration signal in equal signal and blue subpixels average signal.
7. a kind of driving method of display module as claimed in claim 5, which is characterized in that described to obtain current color saturation
The step of signal corresponding default regulation coefficient includes:
The chroma signal of the first color space signal is obtained, is calculated based on chroma signal according to preset calculation formula
It obtains or searches to obtain by default regulation coefficient look-up table based on chroma signal.
8. a kind of driving method of display module as claimed in claim 7, which is characterized in that described to use default regulation coefficient
Carrying out the step of color saturation value turns down processing to current chroma signal includes:
The current chroma signal for obtaining the first color space signal, detects whether current chroma signal meets default color
Saturation degree threshold value, and whether it is located at adjustment tone section, if being all satisfied, based on chroma signal, according to corresponding color
Intensity value and tone section obtain corresponding default regulation coefficient.
9. a kind of drive system of display panel uses the driving side of the display module as described in claim 1-8 any one
Method characterized by comprising
Synchronously driven display panel, drive circuit and drive circuit for backlight module group；
The display module includes the first colour light source and the second colour light source of multiple independent controls；
The display panel, drive circuit includes:
Receiving module converts the first color signal for receiving the first color signal under the corresponding RGB system of display panel
For the first color space signal under HSV system；
Color saturation adjusts module, for carrying out color saturation adjustment to the first color space signal using default regulation coefficient,
Obtain the second color space signal under HSV system；Be converted to according to the second color space signal under RGB system
Second colors signal:
Display panel drive module, for driving display panel using the second color signal；
The drive circuit for backlight module group includes:
Light source regulation coefficient computing module for receiving the first color signal under the corresponding RGB system of display panel, and obtains
The first color space signal and the second color space signal under HSV system, according to the first color space signal and the second color
Color space signal obtains light source regulation coefficient；
Light source adjusting module, for using light source regulation coefficient corresponding to the first colour light source and/or the second colour light source the
One brightness value is adjusted to obtain the second brightness value；
Backlight module drive module, for being driven using the second brightness value to the first colour light source and/or the second colour light source
It is dynamic.
10. a kind of display device, which is characterized in that including a kind of drive system of display panel as claimed in claim 9.
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| PCT/CN2019/077602 WO2020118925A1 (en) | 2018-12-11 | 2019-03-11 | Driving method and driving system for display module, and display apparatus |
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| CN111583876A (en) * | 2020-05-29 | 2020-08-25 | 深圳市华星光电半导体显示技术有限公司 | Backlight module preparation method and device |
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