CN105304029B - A kind of image processing method and liquid crystal display - Google Patents
A kind of image processing method and liquid crystal display Download PDFInfo
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- CN105304029B CN105304029B CN201510902213.8A CN201510902213A CN105304029B CN 105304029 B CN105304029 B CN 105304029B CN 201510902213 A CN201510902213 A CN 201510902213A CN 105304029 B CN105304029 B CN 105304029B
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Abstract
Image processing method and image processing apparatus and liquid crystal display provided in an embodiment of the present invention, belong to image processing field, backlight value in each backlight subarea is obtained according to the gray-scale intensity values of display image, according to comparative result between the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subareas, compensate the target backlight subarea and correspond to display subregion sub-pixel show value, due to showing that image gray-scale level luminance difference brings backlight illumination difference in each display subregion, backlight illumination difference brings local colour cast problem in the display subregion, and determine the regularity of difference and colour cast between backlight illumination, mitigate colour cast phenomenon by compensating display image sub-pixel show value.
Description
Technical field
The present invention relates to field of liquid crystal display, more particularly to a kind of image processing method and liquid crystal display.
Background technology
Liquid crystal display (Liquid Crystal Display, abbreviation LCD) generally use dynamic backlight modulation technique
Control the backlight brightness, can reach energy saving, lifting and the image quality effect such as display contrast.If Fig. 1 is liquid crystal in the prior art
Showing middle dynamic backlight modulation technique principle assumption diagram, liquid crystal display device includes, and image processing part receives received image signal, and
Backlight data is collected according to picture signal gray-scale intensity, on the one hand, according to the specification of predetermined display panel by picture signal
Format transformation is carried out, exports into liquid-crystal display section time schedule controller（TCON）, through time schedule controller production timing control letter
Number and data-signal to drive liquid crystal panel, on the other hand, the backlight data collected is exported to backlight processing unit, the back of the body
Backlight data is converted to backlight control signal by light processing portion, and backlight in backlight assembly is controlled to control backlight drive portion
Brightness, drives higher backlight illumination if brightness of image height, if brightness of image is low to drive relatively low backlight illumination.
Dynamic backlight modulation technique mainly includes subregion backlight modulation and global backlight modulation.Wherein, global backlight modulation
The average brightness that technology gathers a two field picture content controls the backlight brightness, in this way, backlight intrinsic brilliance is schemed by a frame is global
As average gray-scale value determines, therefore, image averaging maximum gray value（I.e.：Complete white field picture）Corresponding driving obtains backlight maximum
Brightness, in order to protect back light functional reliability, usual backlight high-high brightness is controlled below the nominal operation brightness of backlight.
Usually in normal display picture, understood through statistics, in dynamic video picture ensemble average gray-scale intensity in 50%IRE or so, this
Sample, the average value of backlight illumination is then 50% or so of maximum backlight illumination, and therefore, backlight is real in global backlight modulation techniques
Border operation mean power is controlled in half of rated power or so, is there is obvious energy-saving effect to a certain degree.But the global back of the body
The frame or the global image of continuous multiple frames that light modulation techniques collect are averaged gray-scale intensity, are controlled by the image averaging grayscale
Global back light source brightness, the image averaging gray-scale intensity can not embody in picture material luminance detail between partial picture, however,
Picture contrast change is more embodied in picture material between partial picture on luminance difference, and therefore, it is to lifting display pair
Than degree image quality effect can play a role it is smaller.
And subregion dynamic backlight modulation technique, such as backlight subarea in Fig. 2 in the prior art subregion dynamic backlight modulation technique
Schematic diagram, whole backlight source matrix include the M subregion in A directions and N number of subregion in B directions, and such as figure assumes M=16, and N=9, count M*
N=144 backlight subarea, control can be operated alone in back light source brightness in each backlight subarea, wherein it is desired to which it is the backlight to illustrate
Ideally, each backlight subarea can independently illuminate its backlight area to subregion, but in fact, adjacent back light source brightness has one
It is fixing to ring.In subregion dynamic backlight modulation technique, it is divided into multiple subregions corresponding with backlight subarea per frame global image
Video data block, by gathering with luma data in the sectional image data block to obtain the backlight number of the corresponding backlight subarea
According to each subregion backlight data collected embodies luminance difference between corresponding sectional image data block, in this way, the backlight
Subregion backlight illumination is determined that the change of subregion backlight illumination, which embodies, to be needed to show by the brightness of the backlight subarea correspondence image block
Gray-scale intensity in the sectional image data block of regional display, highlights display brightness difference between display image local picture, carries
Rise the contrast image quality effect of dynamic image.
For inventor when using common phosphors LED white light source, the color of white light source is basic in each backlight subarea
Unanimously, colour cast phenomenon is not had.Since common phosphors LED white light source principle is by BLUE LED emissions chip emission blue light
Excite yellow fluorescent powder to produce yellow light with blue light into white, and be not made of in yellow light pure color green light and feux rouges, caused
Common phosphors LED light white light source gamut range is not high, substantially in below 70%NTSC（English full name：National
Television Standards Committee）.In order to improve liquid crystal display gamut range, take and made using technology of quantum dots
Backlight is provided for liquid crystal display, the gamut range of backlight is up to more than 85%NTSC, even more than 100%NTSC.Show
Example, quanta point material is encapsulated among two layers of water oxygen Obstruct membrane and forms quantum dot film, then the quantum dot film is arranged on expansion
Fall apart or the top of light guide plate, green light and feux rouges produced using quanta point material in blue light emitting chip excitation quantum point film,
And white backlight source is mixed into, to lift the gamut range in white backlight source.
But when being dynamic partition backlight control techniques using quantum membrane technology, inventor has found and common LED chip
Excitated fluorescent powder is provided unlike white backlight source, is equally used in subregion backlight technology scheme, in LED chip excitation quantum
The luminous backlight of point, each backlight subarea correspond to the local colour cast phenomenon for showing that sectional image color shows randomness, and
This part colour cast regularity is poor.Such as：When intermediate region shows as white, and surrounding is inclined to blueness, inventor
Solve the problems, such as that edge is partially blue, reduce blue luminescence chip power, i.e.,：Lower the component of blue light, in this way, surrounding can be solved
The blueness in edge region, however, yellow is but inclined in intermediate region, i.e.,：Intermediate region green light and feux rouges are on the high side.
The liquid crystal display for how cracking the dynamic partition backlight control techniques for providing backlight using quantum dot membrane technology is set
Each display inconsistent reason of subregion color in standby, and solve the problems, such as each subregion colour consistency, becomes that there is an urgent need for solution
Certainly technical barrier.
The content of the invention
The embodiment of the present invention provides a kind of image processing method and liquid crystal display, can effectively solve the problem that and is taking quantum dot
Technology is provided in the liquid crystal display of the subregion backlight control of backlight, its display picture part colour cast problem.
To reach above-mentioned purpose, a kind of liquid crystal display in the technical solution that the embodiment of the present invention uses, timing control
Device receives external input display image data, extracted clock signal and viewdata signal;Gate driving circuit, described in reception
Clock signal is to drive driving gated sweep；Data drive circuit, receive the clock signal and described image data-signal with
Driving data electrode carries out data scanning, wherein, the data drive circuit carries out digital-to-analogue conversion to described image data-signal
For pixel voltage value, the pixel voltage value is respectively used to TFT data electrodes in driving liquid crystal pixel cells；Backlight comparing section,
According to the backlight value of target backlight subarea compared with the backlight value of other backlight subareas；Wherein, determined according to comparative result
Compensate the pixel voltage value of each sub-pixel in each subregion.
Backlight value in target shows subregion according to target backlight subarea and other backlight subareas in the embodiment of the present invention
Backlight value weighted mean be compared, wherein, determined to compensate the pixel of each sub-pixel in each subregion according to comparative result
Magnitude of voltage, each sub-pixel pixel voltage value in subregion is shown by compensating target, with make up backward light belt carry out backlight colour cast and
Cause display image color cast problem.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 provides a kind of liquid crystal display for the prior art and shows complete white picture view；
Fig. 2 provides a kind of liquid crystal display for the prior art and shows full the display subregion light schematic diagram of picture in vain；
Fig. 3 is one schematic diagram of liquid crystal display colour cast causation analysis；
Fig. 4 is a kind of liquid crystal display in this implementation；
Fig. 5 provides a kind of flow diagram of image processing method for this implementation one；
Fig. 6 is the division schematic diagram that screen display subregion is shown in liquid crystal display；
Fig. 7 is the backlight subarea schematic diagram of division corresponding with Fig. 6 display subregions；
Fig. 8 is a kind of image processing apparatus schematic diagram；
Fig. 9 is the pixel voltage collocation structure schematic diagram of liquid crystal display in the present invention；
Figure 10 provides a kind of structure diagram of liquid crystal display for the present embodiment two；
Figure 11 is reference voltage generating unit output reference voltage value schematic diagram in the present embodiment two；
Figure 12 provides a kind of structure diagram of liquid crystal display for the present embodiment three.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
In the liquid crystal display of dynamic partition backlight control techniques of backlight is provided using quantum dot membrane technology, it is
Solve in the liquid crystal display that the inconsistent technical barrier of local color, inventor are preliminary in each subregion in display area
Think, be quantum dot in quantum dot film due to occurring colour cast problem immediate cause under the power same case of blue-light source
Caused by material mixture ratio is uneven, i.e.,：If intermediate region is for pure white and during peripheral regions deviation blueness, necessarily quantum dot
The quanta point material proportioning of film intermediate region matches preferably with blue ray, and quanta point material is matched somebody with somebody in peripheral regions quantum dot film
Than relatively low, cause peripheral regions blue ray component on the high side and cause peripheral regions partially blue, therefore, inventor continues amount of analysis
The proportioning of the quanta point material in each region finds that quanta point material proportioning is highly uniform in quantum dot film, does not deposit in son point film
In the above problem.
In above-mentioned local colour cast phenomenon, intermediate region is for pure white and during peripheral regions deviation blueness, at the beginning of inventor
The reason for step thinks the phenomenon should have relation with display area position.Inventor continues analysis and learns, is measured when in quantum dot film
Son point material mixture ratio is uniform and each backlight subarea in blue luminescence chip power it is also identical in the case of, if Fig. 3 is liquid crystal
Show one schematic diagram of equipment colour cast causation analysis, as shown in figure 3, white light source sends blue light booster dose by LED luminescence chips
Son puts quanta point material in film and sends green light and feux rouges and be uniformly mixed into white light with the blue light transmitted through quantum dot film.However,
When showing that whole white image and surrounding adjacent area display that whole white image in intermediate region, intermediate region LED chip is driven
With LED chip transmission power in adjacent area all up to 100%, in the intermediate region white light source, a part is by middle medium blue
LED luminescence chips excitation quantum point material and between the forward direction green light G0 and forward direction feux rouges R0 and the blue light of transmission that produce mixed light and
Into another part produces backward green light G1 and backward feux rouges R1 through reflection for the adjacent blue-ray LED luminescence chip excitation of surrounding
Blue light mixed light forms after to intermediate region and intermediate region blue-ray LED luminescence chip transmission quantum film, this two parts green light and red
When light is with transmiting blue light into white, however, reflection green light and feux rouges can be received in the region of edge with respect to middle area
Domain will be lacked, and the blue light ingredient of transmission is identical with intermediate region, therefore, blue light in white light component after the mixed light of edge region
Component is on the high side, and causes partially blue.But when inventor has found different images content, such as：Intermediate region whole white image,
And surrounding adjacent area brightness of image it is relatively low when, and find that intermediate region is also partially blue, and the partially blue phenomenon of peripheral regions weakens,
Therefore, inventor has found colour cast phenomenon with display area position without direct relation.
Inventor finally just has found the regularity of above-mentioned local colour cast, colour cast master after a large amount of analyses and Experimental comparison
There is direct relation with LED luminosity difference in adjacent backlight subarea, if image display brightness is identical in each subregion,
Local colour cast phenomenon is not had.When poor there are display brightness in adjacent each subregion, i.e.,：The liquid crystal of dynamic partition backlight control
The backlight illumination of each adjacent backlight subarea is different in display device, can produce the colour cast phenomenon of adjacent display subregion.Inventor
Colour cast reason is found based on the above-mentioned further analysis of colour cast rule, as shown in figure 3, when intermediate region and adjacent area show image
Brightness is identical, i.e.,：Corresponding backlight illumination is also identical, and white backlight composition in intermediate region includes, and a part of LED chip 1 shines
Excitation intermediate region quantum dot produces green light and red and transmitting blue is mixed into white light, and another part transmits for LED chip 1
LED chip 2 and LED chip 3 shine the backward light of green and the backward light of red of excitation quantum point generation in blue light and adjacent area
Blue light is transmitted into white light with LED chip 1.However, when intermediate region still shows whole white image and surrounding adjacent area
During dark images, it is 100% to correspond to driving backlight illumination according to the full white image brightness of the intermediate region, i.e.,：Drive LED chip 1
For shine 100% power, meanwhile, LED chip 2 and 3 luminous powers are relatively low in surrounding adjacent area, in this way, intermediate region is white
Green light from surrounding neighboring reflection and feux rouges are reduced in light composition, also result in the partially blue phenomenon in intermediate region, and LED chip
The backward green light of 1 generation and red color light component are more so that inclined yellow in surrounding adjacent area.For another example：Intermediate image brightness is relatively low, and four
When all adjacent area brightness of image is higher, the brightness of 1 luminosity of the LED chip LED chip 2 and 3 adjacent less than surrounding, this
Sample, intermediate region white backlight come from surrounding adjacent LED chip 2 and 3 and excite backward green light and reflection to red light to centre in forming
Component is on the high side in region, causes intermediate region to show image deviation yellow, and from the backward of LED chip in surrounding brighter areas
Green light and feux rouges are less, cause the brighter display area of surrounding partially blue.
The basic principle for the liquid crystal display that dynamic backlight controls is to control the corresponding back of the body according to sectional image brightness size
The brightness of backlight in light subregion, each subregion back light source brightness change according to the random of picture material brightness.It is above-mentioned to analyze
Know, the rule is partially blue for LED chip luminosity region bigger than normal, the inclined yellow in luminosity region less than normal, in order to solve
The problem of random local colour cast should be caused with backlight illumination difference, inventor considers a solution first, passes through drop
Low LED power differences method reduces partially blue problem, this is obviously contradiction with the basic principle of dynamic backlight control technology.Cause
This, if taking the backlight of quantum dot film necessarily to cause to show image randomness part colour cast problem, to people in the art
For member, how to solve the randomness part colour cast problem that the backlight illumination difference is brought is that it faces a technical barrier.
The analytic process made the creative labor based on foregoing invention people, in the liquid crystal of dynamic partition backlight control techniques
Show in equipment, the light-source brightness of each backlight subarea is the overall ash by showing image in the corresponding display subregion in the backlight subarea
What rank brightness value determined, the back light source brightness of the higher driving backlight subarea of its gray-scale intensity is higher, backlight in the subregion
The backward light of green and red backward light that quantum dot produces in BLUE LED emissions chip excitation quantum point film are more, to adjacent area
Color composition influence it is bigger.Based on above-mentioned analytical mathematics, proposition a solution that inventor makes the creative labor,
By image gray-scale level brightness in each display subregion of statistical analysis, each picture of the subregion is compensated according to the gray-scale intensity measures of dispersion
Plain magnitude of voltage, by compensate pixel voltage value in the display subregion make up backlight colour cast bring display image color cast problem, solved
The certainly randomness local display picture colour cast problem.
Fig. 9 is the pixel voltage collocation structure schematic diagram of liquid crystal display in the present invention, as shown in figure 9, timing control
Device（TOCN）Reception external input RGB display image datas, extracted clock signal and viewdata signal, wherein, sequential letter
Number data drive circuit and gate driving circuit are respectively supplied to, realize that cogradient matrix scans, and viewdata signal is supplied to
It is pixel voltage value D that data drive circuit, which carries out digital-to-analogue conversion,1-Dm, pixel voltage value D1-DmIt is respectively used to driving liquid crystal picture
TFT data electrodes in plain unit, according to image gray-scale level luminance difference in each adjacent sectors in the present invention, determine each point of compensation
Each sub-pixel R in area（It is red）、G（Green）And B（Blueness）Pixel voltage value, to make up white light in each backlight subarea
Source colour cast problem.Specifically, according to difference between the backlight value of target backlight subarea and the backlight value of other backlight subareas, determine
Compensate the pixel voltage value of each sub-pixel in each subregion.
It is exemplary, as shown in figure 9, image gray-scale level brightness value shows that sectional image grayscale is bright more than surrounding in display subregion 1
When spending, due to being corresponded in the display subregion 1, red and green is backward in surrounding backlight subarea in backlight in backlight subarea
Light, being less than red when surrounding shows sectional image gray-scale intensity than its image gray-scale level brightness, light ratio is low backward with green,
At this point it is possible to the pixel voltage value D by improving 1 sub-pixel R of the display subregion in proportion1With the pixel voltage of sub-pixel G
Value D2,Can also be by reducing the pixel voltage value D of sub-pixel B3, to make up the display that the inconsistent colour cast of backlight colour mixture is brought
Content colour cast problem.
Wherein, surrounding shows that sectional image gray-scale intensity is bright to the backlight of the display subregion 1 for all backlight subareas of surrounding
The weighted value that degree influences determines.Such as：Surrounding shows gray-scale intensity values of the sectional image gray-scale intensity for each subregion of surrounding with adding
The weight coefficient sum of products, and weighting coefficient shows what the distance of subregion determined by each subregion distance objective, distance is more remote
It is smaller to show that subregion influences target partition, its weighting coefficient is smaller.In practical application, which can be beforehand through survey
Each subregion is measured to obtain the laboratory facilities of target partition brightness influence amplitude, can also be by being determined apart from size relation
The weighted value.
The liquid crystal of the subregion backlight independent control in white backlight source is produced using monochromatic luminescence chip excitation quantum point film
Show in equipment, backlight in the backlight subarea is controlled by showing the gray-scale intensity generation control signal of image in each display subregion
Source brightness, in this way, the higher backlight subarea back light source brightness of image gray-scale level brightness is also higher in display subregion, therefore, each back of the body
Backlight illumination size changes at random in light subregion, causes in backlight mixed light from surrounding backlight to divide in each backlight subarea
Backward light also can be different from the backlight subarea forward light ratio in area, and due to only red in backward light and green mixed light, and
Redgreenblue light mixng proportion is then to determine in forward light, and mixing white light with backward light by forward light is difficult to reach white
Color uniformity, the present invention to solve the above-mentioned problems, take adjustment in proportion show subregion sub-pixel R pixel voltage value and
The pixel voltage value of sub-pixel G, alternatively, the pixel voltage value of adjustment sub-pixel B, reduces the backward light in white light colour mixture accounting not
With influence, wherein, Such analysis understand, due to backward light in white mixed light composition proportion by the subregion backlight illumination with week
Measures of dispersion determines between enclosing backlight subarea, therefore, red son in the display subregion is adjusted according to the backlight illumination measures of dispersion size
Pixel and the pixel voltage value of green sub-pixels or the magnitude of voltage of blue subpixels, can make up backward light and cause display colour cast
Problem.
Embodiment one
The embodiment of the present invention provides a kind of image processing method and applies in liquid crystal display, in the liquid crystal display
Backlight is provided using technology of quantum dots, exemplary, if Fig. 4 is a kind of liquid crystal display in this implementation, which sets
The standby back light provided for down straight aphototropism mode set, multiple point light sources 200 are arranged on the back encapsulating structure 701 of backlight module
（Such as：On backboard）704 inner surface of bottom plate on, point light source 200 can be with blue LED lamp, and quanta point material encapsulation part 702 is positioned at more
The light direction of a point light source 200, in order to which quanta point material heat-proof quality needs and multiple point light sources 200 shine abundant mixed light
It is required that certain heat-insulated gap and light mixing distance will be kept between quanta point material encapsulation part 702 and multiple point light sources 200, its
In, multiple point light sources 200 send excitation light（Such as：Blue light）After abundant mixed light, uniform excitation area source is formed.Then,
The excitation area source is to encourage quanta point material on light direction to produce to be energized light to form mixed light and/or transmission
Excitation light forms white light source, which is encapsulated in quanta point material encapsulation part 702, wherein, quanta point material envelope
Dress portion 702 can be that quantum dot composition is encapsulated in diffuser plate, can be formed by encapsulating quantum dot in optical diaphragm, but also other envelopes
Fill optical texture.When sending excitation light difference excitation quantum point encapsulation part 702 due to multiple point light sources 200, each point light source point
There is not the light energized backward that excitation quantum point can produce（Such as：Backward green light and feux rouges）, this is energized light backward can form phase
The optics composition of neighbouring region white light, its power necessarily affects adjacent area white colours, influences each other to reduce, it is necessary to subtract between it
The few influence of the backward light to adjacent area.
Take in the liquid crystal display of subregion backlight dynamic control technology, it is necessary to will be aobvious according to backlight zoning ordinance
Show the gray-scale intensity of image frame subregion statistical picture picture, converted by gray-scale intensity values in the display image frame subregion
To drive the drive signal of backlight, i.e.,：The display image frame subregion is averaged, and gray-scale intensity is higher to convert backlight drive signal
Drive the brightness of backlight in the backlight subarea also bigger.
It is noted that those of ordinary skill in the art can be produced by configuring in quanta point material encapsulation part 702
The quantity of the quantum dot of feux rouges, green light and blue light, can generate white light, so that backlight illumination is mutually sympathized with each backlight subarea
Under condition, pure white light source can be formed.In order to solve in subregion backlight dynamic control the brightness of different backlight subareas with
When showing sectional image content brightness change, generate local colour cast problem in display subregion, in the present embodiment liquid crystal display set
A kind of image processing apparatus is further included in standby, which can be one or more video frequency processing chips, Ke Yishi
Part of functions in video frequency processing chip.If Fig. 8 is a kind of image processing apparatus schematic diagram, which includes：Acquiring unit
101 and compensating unit 102.
A kind of image processing method is performed in the image processing apparatus, a kind of image processing method is also provided in the present embodiment
Method, if Fig. 5 is that this implementation one provides a kind of flow diagram of image processing method, the execution image processing method of acquiring unit 101
Step 101 program in method, and compensating unit 102 perform step 102 program in image processing method.
Step 101, obtain backlight value in each backlight subarea according to the gray-scale intensity values of display image, the backlight value to
Back light source brightness in each backlight subarea is operated alone.Wherein, backlight can single or multiple points in each backlight subarea
Light source forms, the point light source such as LED luminescence chips, in each backlight subarea the brightness of back light individually control its brightness, should
Back light source brightness size shows what sectional image gray-scale intensity determined by being mapped in the backlight subarea in backlight subarea.
Exemplary, CPU process chips receive inputted video image signal, and the CPU process chips are according to predetermined image point
Area's rule, gathers in the video signal gray-scale intensity values in each image part area respectively, the gray-scale intensity can with average value,
Or average weighted value, then the gray-scale intensity values collected are exported to backlight processing unit, the backlight processing unit is bright by grayscale
Angle value is converted to backlight control signal, controls the brightness of all point light sources in the backlight subarea to control backlight drive portion, shows
Example, single or multiple point light sources can be included in a backlight subarea, such as LED luminescence chips, if image is drawn in the subregion
Face brightness is more high, drives and encourages the brightness of point light source higher in the backlight subarea, if image frame brightness in the subregion is relatively low
Drive and encourage point light source brightness relatively low in the subregion backlight, on the other hand it is also possible that will scheme according to the specification of predetermined display panel
As signal progress format transformation, time schedule controller is exported into liquid-crystal display section（TCON）, sequential is produced through time schedule controller
Control signal and data-signal are to drive liquid crystal panel.
It should be noted that gray-scale intensity values can carry out YUV colors sky by red grey decision-making, green grey decision-making and blue grey decision-making
Between be converted to intensity gray scale value Y-component.Exemplary, cpu chip receives image video signal progress in liquid crystal display
Decoding obtains rgb signal, then passes through low-voltage differential signal（English full name：Low-Voltage Differential
Signaling, English abbreviation：LVDS）Be transferred to video processnig algorithms chip, the video frequency processing chip first to the rgb signal into
Row YUV signal is converted to luminance component Y value in each pixel, which advises according to predetermined display subregion
The luma component values of each pixel in each display subregion are then counted, luma component values carry out pre-defined algorithm turn in the display subregion
The backlight value of the backlight subarea is changed to, then, the backlight value of the backlight subarea is driving back light source brightness in the backlight subarea.
To those skilled in the art, luminance component is converted to the algorithm of the subregion backlight value is very more, and details are not described herein.
Gray-scale intensity values, which are also possible that, obtains the sum of grey decision-making of all red pixels in each display subregion, according to display point
The sum of grey decision-making of all red pixels obtains the average gray-scale value for showing all red pixels in subregion in area, then obtains display subregion
In all red pixels average gray-scale value and display subregion in all red pixels maximum gray value weighted average, shown
Show the red grey decision-making of subregion.Similarly, then each display subregion Green grey decision-making and blue grey decision-making are obtained, by display subregion
Red grayscale, green grey decision-making and blue grey decision-making are converted to intensity gray scale value in the subregion, are changed by the intensity gray scale value
For the backlight value of the backlight subarea.
It should be noted that display subregion can be divided according to backlight subarea, backlight subarea can be according to backlight
Source division, wherein, the backlight each individually controlled is a backlight subarea, and display subregion is usually a pair with backlight subarea
One corresponds.Optionally, display subregion can also be what the image shown according to actual liquid crystal display divided, then every
It is a to show that the corresponding backlight portion region of subregion is exactly backlight subarea.Each backlight subarea may include a backlight point light source
It may include multiple backlight point light sources, for example single led luminescence chip of point light source.
It is exemplary, it is assumed that liquid crystal display includes 9 display subregions and 9 backlight subareas, shows subregion and backlight subarea
It is one-to-one to correspond.Such as Fig. 6 to show the division schematic diagram of screen display subregion in liquid crystal display, such as by display area
It is divided into 9 regions, including display subregion 1, display subregion 2, display subregion 3, display subregion 4, display subregion 5, display subregion
6th, display subregion 7, display subregion 8 and display subregion 9, in this way, such as the backlight subarea that Fig. 7 is division corresponding with Fig. 6 display subregions
Schematic diagram, corresponding backlight are also divided into 9 subregions, including：Backlight subarea 1, backlight subarea 2, backlight subarea 3, backlight subarea
4th, backlight subarea 5, backlight subarea 6, backlight subarea 7, backlight subarea 8 and backlight subarea 9.Backlight value is by showing in backlight subarea 1
Gray-scale intensity values convert in subregion 1, such as：Gray-scale intensity values are 255 grayscale in the display subregion 1, backlight in backlight subarea 1
It is worth for 255, PWM backlight control signals or current controling signal can be converted to by 255 to control the brightness of backlight, also can will
Gray-scale intensity values 255 obtain backlight value through further transfer algorithm, and backlight value is converted to PWM backlight control signals after by conversion
Or current controling signal is to control the brightness of backlight.
Step 102, compare according between the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subareas
Compared with as a result, compensating the color range numerical value of target backlight subarea correspondence display subregion sub-pixel display data.
Pixel voltage value is converted into according to display data progress grayscale after the compensation to drive on display panel per height picture
TFT data electrodes in plain unit, influence to show image color cast problem to make up each display subregion backlight colour cast.
Specifically, when backlight value is more than the backlight value weighted mean of other backlight subareas in target backlight subarea, can be with
Improve the target backlight subarea and correspond to the color range numerical value for showing all red and green sub-pixels display datas in subregion, also may be used
To reduce the color range numerical value that the target shows all blue subpixels display datas in subregion.
Likewise, when backlight value is less than the backlight value weighted mean of other backlight subareas in target backlight subarea, can be with
Reduce the target backlight subarea and correspond to the color range numerical value for showing the display data of all blue subpixels in subregion, can also improve
The target shows the color range numerical value of all red and green sub-pixels display datas in subregion.
When the color range for the display data for compensating red and green sub-pixels in the correspondence display subregion of the target backlight subarea
During numerical value, the compensating proportion amplitude phase of the color range numerical value of all red and green sub-pixels display datas in the display subregion
Together, when the color range numerical value for the display data for compensating the blue subpixels in the correspondence display subregion of the target backlight subarea, this is aobvious
Show that the compensating proportion amplitude of the color range numerical value of the display data of all blue subpixels in subregion is identical.
Wherein, according to ratio between the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subareas,
The color range numerical value that the target backlight subarea corresponds to display subregion sub-pixel display data is compensated according to the ratio.
It is exemplary：The backlight value of target backlight subarea 5 is 255, and backlight value weighted mean is 200 in other backlight subareas,
In this way, the difference of backlight subarea 5 and the backlight value weighted mean of other backlight subareas is 55, compensation shows all red in subregion 5
The show value of color and green sub-pixels, specific compensation magnitude value can preset data table and obtained by lookup table mode, can also it
He obtains calculation, and those skilled in the art are in design, it is necessary to from adjacent sectors in specific backlight subarea after considering
Reflection light ratio specifically determines calculation formula.Such as：When difference is 55/255, and it is 10% that adjacent sectors backlight, which influences coefficient,
Compensating amplitude is（55/255）* 10%=2.1%, in this way, all red and green sub-pixels display datas in the display subregion 5
Color range numerical value lift 2.1% in proportion.
In addition it is also possible to by preset two-dimensional data table, according to the backlight value of target backlight subarea and other backlight subareas
Backlight value weighted mean carry out lookup table mode, determine the benefit of the color range numerical value of corresponding sub-pixel display data in the target partition
Amplitude is repaid, according to the color range numerical value of corresponding sub-pixel display data in definite compensation amplitude compensation target partition.
Illustrate, the backlight value weighted mean of other backlight subareas is whole or portion in addition to target backlight subarea
The backlight value of point backlight subarea is multiplied by what corresponding weighting coefficient determined.Exemplary, backlight subarea 1 is target partition, other back ofs the body
Light subregion is backlight subarea 2, backlight subarea 3, backlight subarea 4, backlight subarea 5, backlight subarea 6, backlight subarea 7, backlight subarea 8
With backlight subarea 9, in fact, if it is considered that away from backlight subarea 1 other backlight subareas 3, backlight subarea 6, backlight subarea
7th, backlight subarea 8 and backlight subarea 9 influence backlight subarea 1 very small, can in the backlight value weighted mean of other backlight subareas
With not comprising other backlight subareas away from backlight subarea 1.Explanation is further continued for, the weighting coefficient of corresponding backlight subarea is
Target backlight subarea brightness contribution size is determined by its backlight illumination, wherein, the backlight point further away from target backlight subarea
The weighting coefficient in area is smaller.
Specifically, the backlight value weighting coefficient acquisition methods of other backlight subareas outside the target backlight subarea are obtained, this
Field technology personnel can obtain according to experiment method, such as：Backlight subarea 1 is target backlight subarea, can be by closing or opening
The brightness change situation of backlight subarea 1 when opening 2 mode of backlight subarea, obtains backlight subarea 2 and 1 backlight illumination of backlight subarea is contributed
It is small to obtain weighting coefficient greatly, likewise, obtaining the weighting coefficient of other backlight subareas.Then, using each backlight subarea as
Target backlight subarea obtains the weighting coefficient of other backlight subareas respectively, and the target backlight point prestored is obtained with lookup table mode
The weighting coefficient of other backlight subareas outside area, then the backlight value weighted mean of other backlight subareas is calculated.Also can root
The weighting coefficient is determined according to target backlight value and other backlight subarea distance parameters, wherein, the more remote backlight subarea of distance is to mesh
The brightness influence of mark backlight subarea is smaller, its weighting coefficient is also smaller.
In the present embodiment, backlight value in each backlight subarea is obtained according to the gray-scale intensity values of display image, according to target
Comparative result between the backlight value of backlight subarea and the backlight value weighted mean of other backlight subareas, compensates the target backlight subarea
The corresponding color range numerical value for showing subregion sub-pixel display data, this makes up the pixel electricity of the color range numerical value conversion of rear display data
Pressure is to drive pixel to show, due to showing that image gray-scale level luminance difference brings backlight illumination difference, backlight in each display subregion
Luminance difference brings local colour cast problem in the display subregion, and determines the regularity of difference and colour cast between backlight illumination, leads to
Overcompensation shows that the color range numerical value of image sub-pixel display data mitigates colour cast phenomenon.
Embodiment two：
The present embodiment two provides a kind of liquid crystal display, and the liquid crystal display is as shown in figure 4, be downward back optical mode
The back light that group provides, multiple point light sources 200 are arranged on the back encapsulating structure 701 of backlight module（Such as：On backboard）Bottom
On 704 inner surface of plate, point light source 200 can be located at going out for multiple point light sources 200 with blue LED lamp, quanta point material encapsulation part 702
Light direction, will be in quantum dot in order to which quanta point material heat-proof quality needs and multiple point light sources 200 shine abundant mixed light requirement
Certain heat-insulated gap and light mixing distance are kept between material package portion 702 and multiple point light sources 200, wherein, multiple point light sources 200
Send excitation light（Such as：Blue light）After abundant mixed light, uniform excitation area source is formed.Then, the excitation area source is with sharp
Encourage the quanta point material on light direction and produce the excitation light formation white light for being energized light formation mixed light and/or transmission
Source, the quanta point material are encapsulated in quanta point material encapsulation part 702, wherein, quanta point material encapsulation part 702 can be diffusion
Quantum dot composition is encapsulated in plate, can be formed by encapsulating quantum dot in optical diaphragm, but also other encapsulating optical structures.The liquid crystal
Display device is taken in the liquid crystal display of subregion backlight dynamic control technology, it is necessary to will be aobvious according to backlight zoning ordinance
Show the gray-scale intensity of image frame subregion statistical picture picture, converted by gray-scale intensity values in the display image frame subregion
To drive the drive signal of backlight, i.e.,：The display image frame subregion is averaged, and gray-scale intensity is higher to convert backlight drive signal
Drive the brightness of backlight in the backlight subarea also bigger.
Understood as foregoing, in order to determine to compensate each subregion sub-pixel R（It is red）、G（Green）And B（Blueness）Pixel
Magnitude of voltage, as shown in Figure 10, the liquid crystal display include：Image processing part, it is obtained according to the gray-scale intensity values of display image
Take backlight value in each backlight subarea, backlight comparing section, its backlight value according to target backlight subarea and other backlight subareas
Backlight value weighted mean is compared, reference voltage generating unit, it determines this according to the backlight value comparative result of backlight comparing section
Target backlight subarea, which corresponds to, shows that the color range numerical value of subregion sub-pixel carries out the reference voltage of digital-to-analogue conversion, is shown with compensating target
Show each sub-pixel R in subregion（It is red）、G（Green）And B（Blueness）Pixel voltage value.
In prior art, digital analog converter to by the color range numerical value conversion of redgreenblue display data for simulation believe
Number, by each respective data lines on liquid crystal display panel, the pixel voltage of each display pixel cells is applied respectively to, its
In, it is not homochromy to make the color range value of display data with showing image consistency by applying subjective reflection on electric field liquid crystal cells
Rank value corresponding conversion reference data voltage is different, is corresponded to by adjusting color range identical to realize with reference data voltage correspondence
Color range data reflect close display image by different liquid crystal, i.e.,：Adjust gamma curve.Wherein, in order to more preferably show effect
Fruit, each color sub-pixel correspond to a gamma curve respectively, and it is corresponding different respectively which includes different color range data
Reference voltage value.Therefore, in prior art, in order to objectively respond display image consistency, phase in the sub-pixel of same color
With the corresponding reference voltage of color range it is identical, that is to say, that same color sub-pixel only has a gamma curve, the gamma curve
Reflect that different color range values correspond to different reference voltage values, i.e.,：A kind of one color range value of color sub-pixels is in a corresponding benchmark
Magnitude of voltage.
In order to solve since backward red and green light can impact adjacent backlight subarea backlight color, surrounding phase
Backward red and green light size can cause red, green and blue coloured light proportioning in the white light of target backlight subarea to lose in neighbouring region
Adjust, so that the uncontrolled and easy colour cast problem of target backlight subarea backlight color, in the present embodiment two, according to target backlight subarea
Backlight value is determined the color range of each display data by comparative result compared with the backlight value weighted mean of other backlight subareas
It is worth corresponding reference voltage value, i.e.,：When the mutually same color range value of display data in same color sub-pixel, due in the different back ofs the body
Different comparative results are produced under brightness, also can determine whether different reference voltage values, which makes up backward red
Color and green light can cause red, green and blue coloured light proportioning variation issue in the white light of target backlight subarea.
Specifically, the backlight value of target backlight subarea and the backlight value weighted mean acquisition methods and reality of other backlight subareas
Apply that example one is identical, and details are not described herein.
In this implementation two, since display data is with color stage value in same color sub-pixel, according to target backlight subarea
Backlight value can determine that the reference voltage of different digital-to-analogue conversions, meeting from the backlight value weighted mean comparative result of other backlight subareas
Different pixels magnitude of voltage is converted to drive on display panel TFT data electrodes in corresponding sub-pixel unit, is shown with making up target
Show the display image colour cast problem that subregion is brought due to backlight colour cast.
Further illustrate, when backlight value is more than the backlight value weighted mean of other backlight subareas in target backlight subarea
When, it may be determined that the corresponding benchmark for showing all red and green sub-pixels digital-to-analogue conversions in subregion in the target backlight subarea
Voltage, makes it improve all red and green sub-pixels pixel voltage values in the display subregion, can also determine that the target is carried on the back
The corresponding reference voltage for showing the digital-to-analogue conversion of all blue subpixels in subregion, makes it reduce in the display subregion in light subregion
The pixel voltage value of all blue subpixels.
When backlight value is less than the backlight value weighted mean of other backlight subareas in target backlight subarea, it may be determined that the mesh
The corresponding reference voltage for showing all red and green sub-pixels digital-to-analogue conversions in subregion in backlight subarea is marked, reducing it should
Show all red and green sub-pixels pixel voltage values in subregion, can also determine corresponding display in the target backlight subarea
The reference voltage of the digital-to-analogue conversion of all blue subpixels in subregion, makes it improve all blue subpixels in the display subregion
Pixel voltage value.
Wherein,, it is necessary to during all red and green sub-pixels pixel voltage values, it is all during the target shows subregion
It is red identical with green sub-pixels adjustment ratio amplitude, likewise, when needing the pixel voltage value of all blue subpixels, its institute
There are blue subpixels to adjust ratio amplitude also identical.
Can also be by preset two-dimensional data table, according to the backlight value of target backlight subarea and the backlight of other backlight subareas
It is worth weighted mean and carries out lookup table mode, determines the benchmark of the color range numerical value conversion of corresponding sub-pixel display data in the target partition
Magnitude of voltage, wherein, with reference to needing compensation magnitude to set in the preset two-dimensional data table.Wherein, which can pass through
Experimental method, the backward red and green light of generation of statistics surrounding backlight subarea influence the backlight illumination of target backlight subarea
Degree determines.It can also compare according between the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subareas
Value, and surrounding other backlight subarea backlight illuminations correspond to target backlight subarea influence degree and determine the compensation magnitude.
Exemplary, Figure 11 is reference voltage generating unit output reference voltage value schematic diagram in the present embodiment two, as shown in the figure,
The different reference voltage values of V0~Vm m are exported, wherein, backlight comparing section, the backlight value of generation target backlight subarea is carried on the back with other
The comparative result of the backlight value weighted mean of light subregion, reference voltage generating unit is according to the comparative result from reference voltage storage part
The color range that middle tables of data reads display data is worth corresponding reference voltage value, and generates corresponding benchmark according to reference voltage value is read
Voltage output value digital analog converter carries out color range data conversion and generates corresponding pixel voltage.
Wherein, reference voltage storage part includes multiple look-up tables, for according to the backlight value for storing different backlight subareas
From the corresponding different look-up tables of the backlight value weighted mean of other backlight subareas, each look-up table corresponds to different color range data pair respectively
The reference voltage value answered.
Can also be different according to ratio between the backlight value of backlight subarea and the backlight value weighted mean of other backlight subareas
Different look-up tables are corresponded to respectively, it sets look-up method to lack with respect to look-up table number according to ratio.
In order to solve to influence adjacent backlight subarea backlight colour mixture by backward red and green light, in surrounding adjacent area after
To red and green light size as dynamic backlight control is adjusted, which can cause backward red and green to cause
In the white light of target backlight subarea red, green and blue coloured light proportioning imbalance, cause target backlight subarea backlight color uncontrolled and
Easy colour cast problem, the backlight value in target shows subregion according to target backlight subarea and other backlight subareas in the present embodiment two
Backlight value weighted mean be compared, according to comparative result using preset different gamma curves, mesh is determined from the gamma curve
Mark shows the conversion reference voltage of each sub-pixel in subregion, wherein, which is shown in subregion respectively with compensating target
A sub-pixel R（It is red）、G（Green）And B（Blueness）Pixel voltage value, can make up backward light by adjusting pixel voltage value
Bring backlight colour cast and cause display image color cast problem.
Embodiment three：
The present embodiment three provides a kind of liquid crystal display, and the liquid crystal display is as shown in figure 4, be downward back optical mode
The back light that group provides, multiple point light sources 200 are arranged on the back encapsulating structure 701 of backlight module（Such as：On backboard）Bottom
On 704 inner surface of plate, point light source 200 can be located at going out for multiple point light sources 200 with blue LED lamp, quanta point material encapsulation part 702
Light direction, will be in quantum dot in order to which quanta point material heat-proof quality needs and multiple point light sources 200 shine abundant mixed light requirement
Certain heat-insulated gap and light mixing distance are kept between material package portion 702 and multiple point light sources 200, wherein, multiple point light sources 200
Send excitation light（Such as：Blue light）After abundant mixed light, uniform excitation area source is formed.Then, the excitation area source is with sharp
Encourage the quanta point material on light direction and produce the excitation light formation white light for being energized light formation mixed light and/or transmission
Source, the quanta point material are encapsulated in quanta point material encapsulation part 702, wherein, quanta point material encapsulation part 702 can be diffusion
Quantum dot composition is encapsulated in plate, can be formed by encapsulating quantum dot in optical diaphragm, but also other encapsulating optical structures.The liquid crystal
Display device is taken in the liquid crystal display of subregion backlight dynamic control technology, it is necessary to will be aobvious according to backlight zoning ordinance
Show the gray-scale intensity of image frame subregion statistical picture picture, converted by gray-scale intensity values in the display image frame subregion
To drive the drive signal of backlight, i.e.,：The display image frame subregion is averaged, and gray-scale intensity is higher to convert backlight drive signal
Drive the brightness of backlight in the backlight subarea also bigger.
Understood as foregoing, in order to determine to compensate each subregion sub-pixel R（It is red）、G（Green）And B（Blueness）Pixel
Magnitude of voltage, as shown in figure 12, the liquid crystal display include：Image processing part, it is obtained according to the gray-scale intensity values of display image
Take backlight value in each backlight subarea, backlight comparing section, its backlight value according to target backlight subarea and other backlight subareas
Backlight value weighted mean is compared, and compensates control unit, it determines the target according to the backlight value comparative result of backlight comparing section
Backlight subarea, which corresponds to, shows each sub-pixel R in subregion（It is red）、G（Green）And B（Blueness）Pixel voltage offset, compensation
Circuit, the pixel voltage value of each sub-pixel in the compensation display subregion is controlled according to the pixel voltage offset is determined.
Specifically, the backlight value of target backlight subarea and the backlight value weighted mean acquisition methods and reality of other backlight subareas
Apply that example one is identical, and details are not described herein.Wherein, compensation circuit belongs to prior art category, and those skilled in the art can be set
Specific compensation circuit.
Wherein, according to pixel magnitude of voltage after the compensation, to drive, TFT data are electric in each sub-pixel unit on display panel
Pole, influences to show image color cast problem to make up each display subregion backlight colour cast.
Specifically, when backlight value is more than the backlight value weighted mean of other backlight subareas in target backlight subarea, compensation
Control unit determines the pixel voltage offset of each sub-pixel by lookup table mode, and compensation circuit can determine offset according to this
Improve the target backlight subarea and correspond to the pixel voltage values for showing all red and green sub-pixels in subregion, can also be according to this
Determine that offset reduces the pixel voltage value that the target shows all blue subpixels in subregion.
Likewise, when backlight value is less than the backlight value weighted mean of other backlight subareas in target backlight subarea, compensation
Control unit determines the pixel voltage offset of each sub-pixel by lookup table mode, and compensation circuit can determine offset according to this
Reduce the target backlight subarea and correspond to the pixel voltage values for showing all red and green sub-pixels in subregion, can also be according to this
Determine that offset improves the pixel voltage value that the target shows all blue subpixels in subregion.
Further illustrate, compensation control unit determines the compensating proportion amplitude of the pixel voltage offset of each sub-pixel
It is identical.Specifically, when compensating the pixel voltage value of the red and green sub-pixels in target display subregion, in the display subregion
All red are identical with the compensating proportion amplitude of the pixel voltage value of green sub-pixels, the indigo plant in compensation target display subregion
During the pixel voltage value of sub-pixels, the compensating proportion amplitude phase of the pixel voltage value of all blue subpixels in the display subregion
Together.
Specifically, can also by preset two-dimensional data table, in the preset two-dimensional data table with reference to need compensation magnitude come
Set.Wherein, which by experimental method, can count the backward red and green light of generation of surrounding backlight subarea
The backlight illumination influence degree of target backlight subarea is determined.Can also be according to the backlight value and other backlights of target backlight subarea
Ratio between the backlight value weighted mean of subregion, and around other backlight subarea backlight illuminations correspond to the influence of target backlight subarea
Degree determines the compensation magnitude.
In order to solve to influence adjacent backlight subarea backlight colour mixture by backward red and green light, in surrounding adjacent area after
To red and green light size as dynamic backlight control is adjusted, which can cause backward red and green to cause
In the white light of target backlight subarea red, green and blue coloured light proportioning imbalance, cause target backlight subarea backlight color uncontrolled and
Easy colour cast problem, the backlight value in target shows subregion according to target backlight subarea and other backlight subareas in the present embodiment three
Backlight value weighted mean be compared, according to preset two-dimensional look-up table, determine the picture of each sub-pixel in the display subregion
Plain voltage compensation value, according to offset control compensation finally driving the pixel of TFT data electrodes in sub-pixel unit electric
Pressure value, with make up backward light belt carry out backlight colour cast and cause display image color cast problem.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can pass through
The relevant hardware of programmed instruction is completed, and foregoing program can be stored in a computer read/write memory medium, the program
Upon execution, the step of execution includes above method embodiment；And foregoing storage medium includes：Read-only storage（Read-
Only Memory, ROM）, random access memory（Random-Access Memory, RAM）, magnetic disc or CD etc. it is various
Can be with the medium of store program codes.
The above description is merely a specific embodiment, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
- A kind of 1. liquid crystal display, it is characterised in thatTime schedule controller receives external input display image data, extracted clock signal and viewdata signal;Gate driving circuit, receives the clock signal to drive driving gated sweep；Data drive circuit, is received the clock signal and described image data-signal and is swept with driving data electrode progress data Retouch, wherein, it is pixel voltage value that the data drive circuit carries out digital-to-analogue conversion to described image data-signal, the pixel electricity Pressure value is respectively used to TFT data electrodes in driving liquid crystal pixel cells；Backlight comparing section, according to the backlight value of target backlight subarea compared with the backlight value of other backlight subareas；Wherein, determined to compensate the pixel voltage value of each sub-pixel in each subregion according to comparative result.
- 2. the liquid crystal display according to claim 1, it is characterised in that determine each sub-pixel in each subregion of compensation Pixel voltage value, specifically include：Compensate in proportion and show the pixel voltage value of red sub-pixel and green sub-pixels in subregion to improve target, alternatively, together Proportional compensation with reduce target show subregion in blue subpixels pixel voltage value.
- 3. the liquid crystal display according to claim 1, it is characterised in that the backlight value of the target backlight subarea and its Difference between the backlight value of his backlight subarea, specifically includes：Determine that target shows the ratio of the sum of the backlight value of subregion and the weighting backlight value of surrounding backlight subarea.
- 4. the liquid crystal display according to claim 3, it is characterised in that the weighting backlight value of the surrounding backlight subarea Weighting coefficient determined by the distance of distance objective backlight subarea, wherein, distance objective shows the more remote display subregion of subregion Weighting coefficient is smaller.
- 5. the liquid crystal display according to claim 1, it is characterised in that further include：Reference voltage generating unit, the color range numerical value for determining the display subregion sub-pixel according to comparative result carry out digital-to-analogue The reference voltage of conversion, to compensate the pixel voltage value that target shows each sub-pixel in subregion.
- 6. the liquid crystal display according to claim 5, it is characterised in that reference voltage generating unit is specifically used for：To display data in same color sub-pixel with color stage value, the backlight value of subregion is shown according to target and surrounding is shown point The backlight value weighted mean comparative result in area, determines the reference voltage of different digital-to-analogue conversions, to be converted to different pixels voltage Value is to drive on display panel TFT data electrodes in corresponding sub-pixel unit.
- 7. the liquid crystal display according to claim 6, it is characterised in that reference voltage generating unit, is specifically used for：When target shows that backlight value is more than the backlight value weighted mean of other backlight subareas in subregion, determine that the target is shown The reference voltage of all red and green sub-pixels digital-to-analogue conversions in subregion, it is all red in the target display subregion to improve The pixel voltage value of color and green sub-pixels, alternatively, determining that the target shows that the digital-to-analogue of all blue subpixels in subregion turns The reference voltage changed, to reduce the pixel voltage value that the target shows all blue subpixels in subregion.
- 8. the liquid crystal display according to claim 6, it is characterised in that reference voltage generating unit, is specifically used for：When target shows that backlight value is less than the backlight value weighted mean of other backlight subareas in subregion, determine that the target is shown The reference voltage of all red and green sub-pixels digital-to-analogue conversions in subregion, it is all red in the target display subregion to reduce The pixel voltage value of color and green sub-pixels, alternatively, determining that the target shows that the digital-to-analogue of all blue subpixels in subregion turns The reference voltage changed, to improve the pixel voltage value that the target shows all blue subpixels in subregion.
- 9. according to any liquid crystal display in claim 5-8, it is characterised in that further include：Reference voltage storage part, for storing multiple look-up tables, according to the backlight value and other backlights for storing different backlight subareas The backlight value weighted mean of subregion corresponds to different look-up tables.
- 10. according to any liquid crystal display in claim 5-8, it is characterised in that further include：Reference voltage storage part, for storing multiple look-up tables, according to the backlight value of backlight subarea and the back of the body of other backlight subareas Ratio difference corresponds to different look-up tables respectively between light value weighted mean.
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| KR102532775B1 (en) * | 2018-10-10 | 2023-05-17 | 삼성디스플레이 주식회사 | Display device |
| CN109285521B (en) * | 2018-11-20 | 2020-09-08 | 惠科股份有限公司 | Pixel driving method, pixel driving device and computer equipment |
| CN110246466B (en) * | 2019-07-12 | 2021-01-29 | 业成科技（成都）有限公司 | Light source control method of display device and liquid crystal display device |
| CN112397032B (en) * | 2019-08-19 | 2022-06-07 | Tcl科技集团股份有限公司 | Dynamic backlight driving module, method and display driving module |
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| CN102355561A (en) * | 2011-09-20 | 2012-02-15 | 青岛海信电器股份有限公司 | Method and device for improving image contrast, LCD TV (liquid crystal display television) set |
| CN102622990A (en) * | 2012-04-17 | 2012-08-01 | 青岛海信电器股份有限公司 | Liquid crystal screen backlight control device, television and liquid crystal screen backlight control method |
| CN102930831A (en) * | 2012-11-06 | 2013-02-13 | 青岛海信信芯科技有限公司 | Liquid crystal display screen image displaying method, device and liquid crystal display television |
| CN105047142A (en) * | 2015-09-01 | 2015-11-11 | 青岛海信电器股份有限公司 | Liquid crystal display brightness control method and device and liquid crystal display equipment |
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| CN105304029A (en) | 2016-02-03 |
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